Plural Input Signal Means For Single Motor Valve (453) Patents (Class 91/367)
  • Patent number: 10202985
    Abstract: The present invention relates to a system preventing the pressured oil leakage in a cylinder line enabling very low leakage rates without using the valve or the system, or without reducing the diametrical space between the housing and spool.
    Type: Grant
    Filed: July 12, 2013
    Date of Patent: February 12, 2019
    Assignee: Hema Endustri Anonim Sirketi
    Inventor: Vahit Olcay Kucukcelebi
  • Patent number: 9995312
    Abstract: An exhaust-gas turbocharger (1) having a turbine (2) which has a turbine housing (3) and which has an exhaust-gas control device (4, 5) arranged in the turbine housing (2); and having an actuator (12; 12?) which is operatively connected to the exhaust-gas control device (4, 5) via a drive train (6), with at least one damping connecting element (8; 8I; 8II; 8III; 8IV; 8V; 8VI) arranged in the drive train (6).
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: June 12, 2018
    Assignee: BorgWarner Inc.
    Inventors: Ralf Christmann, Bjoern Bergner
  • Patent number: 9731692
    Abstract: An embodiment discloses a brake booster input rod, including: a front end portion to which an input piston of a brake booster is connected; a rear end portion to which a yoke connected with to a brake pedal is attached; and an annular boot installing groove to be engaged with, when a boot covers a front portion of the input rod, a rear end bead portion of the boot with a fastening margin. Through rolling, two annular groove portions and an annular ridge portion are formed to each have a triangular section. The ridge portion functions as a rear side wall of the boot installing groove.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: August 15, 2017
    Assignee: AUTOLIV NISSIN BRAKE SYSTEMS JAPAN CO., LTD.
    Inventor: Shuuichi Yatabe
  • Patent number: 9457780
    Abstract: Provided is a negative pressure type booster device, in which a diaphragm of a movable partition wall has, in a penetration portion through which a tie rod bolt hermetically penetrates, a tubular guide portion that abuts against an annular flange portion provided on the tie rod bolt during forward movement of a power piston, and an annular sealing portion that is provided in the rear of the guide portion to block communication between a negative pressure chamber and a variable pressure chamber. The guide portion is provided with a communication portion through which a negative pressure chamber side space exposed by the front surface of the sealing portion communicates with the negative pressure chamber, even in a state in which the guide portion abuts against the annular flange portion.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: October 4, 2016
    Assignee: ADVICS CO., LTD.
    Inventor: Yoshiyuki Yasui
  • Patent number: 9303781
    Abstract: A servo valve includes a movable throttling member positioned between a first opening and an opposing second opening, and a first inlet port and a second inlet port to convey a fluid flow toward the first and opening, respectively. A first inlet orifice, defined between the first inlet port and a first pressure reaction member, is located between and in fluid communication with the first inlet port and the first opening. A second inlet orifice, is located between and in fluid communication with the second inlet port and the second opening. The second pressure reaction member is secured to the first pressure reaction member at a substantially fixed distance. Each of the first inlet orifice and the second inlet orifice is variable via a change a pressure of the fluid flow downstream of the first inlet orifice and the second inlet orifice.
    Type: Grant
    Filed: February 6, 2013
    Date of Patent: April 5, 2016
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventor: Leo J. Veilleux, Jr.
  • Patent number: 9016806
    Abstract: A brake actuating unit for actuating a motor vehicle braking system of the “brake-by-wire” type having a brake booster. In order to provide a brake actuating unit for actuating a motor vehicle braking system of the “brake-by-wire” type, which on the one hand fulfills the statutory requirements care and which on the other hand is inexpensive to produce, it is proposed according to aspects of the invention, that the brake booster be provided as a travel-controlled brake booster, so that when not in the “brake-by-wire” operating mode the brake pedal is decoupled from feedback forces of the brake actuating unit, and the return force is simulated by the pedal travel simulator even when not in the “brake-by-wire” operating mode.
    Type: Grant
    Filed: July 27, 2010
    Date of Patent: April 28, 2015
    Assignee: Continental Teves AG & Co., oHG
    Inventors: Michael Vogt, Ingolf Buchholz, Alexander Schubert, Thomas Rössler, Thorsten Neu
  • Patent number: 8695478
    Abstract: In order to impart a pleasant brake pedal feeling to the operator in the transition from a ‘conventional mode’ to a ‘brake-by-wire’ mode, it is disclosed that the travel (s) covered upon application of the brake pedal is determined and subsequently reduced by the operator, and in that upon reduction of the actuating travel (s) by a predetermined value (?s) or in the event of a detected vehicle movement or a positive result of a monitoring function of the connecting and disconnecting device running in the background, the connecting and disconnecting device is activated and the brake booster is actuated by the electronic control unit.
    Type: Grant
    Filed: February 14, 2007
    Date of Patent: April 15, 2014
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Stefan Feick, Thorsten Ullrich, Klaus Dieter Pagel
  • Patent number: 8561520
    Abstract: A brake servo whose valve piston has a concentric sealing seat which projects axially beyond a second sealing seat, with the concentric sealing seat having at least one recess for throttling the air volume flow. The controllability and also the noise characteristics of the brake servo can be improved in this way.
    Type: Grant
    Filed: November 20, 2008
    Date of Patent: October 22, 2013
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Volker Ickler, Michael Kollers, Horst Kraemer, Stephan Krebs, Harald König, Ralf Jakobi, Thorsten Neu
  • Patent number: 8375989
    Abstract: A method of operating a control valve assembly for a hydraulic system includes detecting the current operation of a first position sensor and a second position sensor to determine if at least one of the first position sensor and the second position sensor is inoperable. A pressure of the fluid at a first work port and a second work port is measured, and one of a first valve and a second valve is actuated when one of the first position sensor and the second position sensor is determined to be inoperable. The first valve is actuated based upon the fluid pressure measured at the second work port to adjust the flow of the fluid through the first work port. The second valve is actuated based upon the fluid pressure measured at the first work port to adjust the flow of the fluid through the second work port.
    Type: Grant
    Filed: October 22, 2009
    Date of Patent: February 19, 2013
    Assignee: Eaton Corporation
    Inventor: Chris W. Schottler
  • Patent number: 8297178
    Abstract: A servobrake for motor vehicles including a control valve which can be actuated by an electromagnet independently of an actuating rod which displaces a valve piston, which electromagnet actuates a third seal seat which makes possible ventilation of a working chamber. The third seal seat is formed on a sleeve which cooperates with the electromagnet, an annular element being provided which is arranged displaceably with respect to the third seal seat and which bears against the sleeve via an interposed elastic or compressible element. The annular element has means for guiding an air flow produced during normal braking in the direction of the working chamber.
    Type: Grant
    Filed: August 7, 2007
    Date of Patent: October 30, 2012
    Assignee: Continental Teves AG & Co. oHG
    Inventor: Stephan Becker
  • Patent number: 7950320
    Abstract: Disclosed is a brake booster for motor vehicles, the control valve (12) of which is operable, irrespective of an actuating rod (7) that displaces a valve piston (9), via an electromagnet (20), which actuates a third sealing seat (24) allowing ventilation of the working chamber (3). The third sealing seat (24) is provided on a sleeve (32) that cooperates with the electromagnet (20), and a ring (36) is arranged, which is displaceable in relation to the third sealing seat (24) and is supported on the sleeve (32) by the intermediary of an elastic or compressible element (37). In order to improve the dynamics and the sound behavior of the brake booster, the ring (36) is arranged radially within the sleeve (32) in such a manner that its areas (33), by which it is in contact with the valve body (10), at least partly release the passages (19) provided in the valve body (10).
    Type: Grant
    Filed: July 11, 2005
    Date of Patent: May 31, 2011
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Horst Krämer, Michael Haber
  • Publication number: 20080134874
    Abstract: A pneumatic brake booster 1 comprising: a sealed structure 3 comprising a rigid casing 11 forming a funnel 19 furnished with an opening and a movable wall 13 dividing the sealed structure 3 into a low-pressure chamber 25 and a working chamber 27, a pneumatic piston 5 comprising a boss 31 fixedly attached to the movable wall 13 and mounted so as to slide in the funnel opening, a valve element 33 housed in the boss 31 and a seal 35 positioned between the boss 31 and the funnel 19, an input rod 7 and an output rod 9 coupled on either side of the pneumatic piston 5, and a return spring 37 to return the pneumatic piston 5 to a rest position, the return spring 37 being placed in the low-pressure chamber 25 between an internal surface 45 of the rigid casing and the pneumatic piston 5, and a force sensor 39 placed in the low-pressure chamber 25 and subjected to the pressure variations of the return spring 37.
    Type: Application
    Filed: December 5, 2007
    Publication date: June 12, 2008
    Applicant: ROBERT BOSCH GMBH
    Inventors: Yannick Nen, Olivier Bernadat, Bruno Beylerian, Omar Brahmi
  • Patent number: 6981438
    Abstract: A hydraulic brake booster has an actuator arrangement for a control valve that includes a ball that is located in a first sleeve retained in a stepped bore of a cylindrical member and a pin that is retained in the cylindrical member. The pin has a first end that is located in an actuation chamber and is connected with a first input member and a second end that extends into the stepped bore to engage the ball. The first end on receipt of a first input force initially moves the pin and ball from a position of rest to interrupt fluid communication between the actuation chamber and a reservoir and thereafter moves the sleeve to selectively initiate metered communication of pressurized fluid to the actuation chamber that acts on a first piston to effect a first brake application of a wheel brake. A second sleeve that surrounds the pin has a lip on a first end that engages the cylindrical member to position a second end thereon in an auxiliary actuation chamber within the housing of the brake booster.
    Type: Grant
    Filed: January 29, 2004
    Date of Patent: January 3, 2006
    Assignee: Robert Bosch Corporation
    Inventors: Timothy Jay Albert, Robert K. Wilson
  • Patent number: 6748847
    Abstract: A brake booster 1 includes a valve mechanism 6, and a solenoid 8 which operates the valve mechanism 6. When the solenoid 8 is energized, a solenoid plunger 26 and a valve seat member 11 move rearward relative to a valve body 3, whereby the valve mechanism 6 is operated to actuate the brake booster 1 without depressing a brake pedal. A core member 27 which forms a magnetic path for the solenoid 8 is disposed rearward of the solenoid plunger 26 so as to be movable axially of the valve body and so as to move in linked relationship with a valve plunger 13. The invention allows the size of the solenoid 8 to be reduced.
    Type: Grant
    Filed: October 10, 2002
    Date of Patent: June 15, 2004
    Assignee: Bosch Automotive Systems Corporation
    Inventors: Yoshiyasu Takasaki, Hiroyuki Yamaga
  • Patent number: 6748846
    Abstract: A solenoid valve includes a valve housing having first, second, and third valve ports, an actuation rod, a first tip valve actuated by the first end of the actuation rod to allow or block fluid passage through the first valve port, and a second tip valve actuated by the second end of the actuation rod to allow or block passage through the second valve port. A vacuum booster diaphragm subassembly includes a vacuum booster diaphragm and a grommet attached to the vacuum booster diaphragm. A vacuum booster assembly includes the above-described solenoid valve, includes primary and secondary diaphragms, and includes the above-described grommet attached to the secondary diaphragm, wherein the secondary diaphragm is the above-described vacuum booster diaphragm.
    Type: Grant
    Filed: April 4, 2002
    Date of Patent: June 15, 2004
    Assignee: Delphi Technologies, Inc.
    Inventors: Timothy A. Haerr, Gary C. Fulks, Timothy M. Schlangen
  • Patent number: 6705200
    Abstract: A vacuum brake booster (1) has a vacuum chamber (4) and a working chamber (3), which are separated from one another in a pressure-proof manner by a movable wall (5). A control valve (6), which has a housing (7) workingly coupled to the movable wall (5), has a valve seat (10), which is disposed in the housing (7) and which in dependence upon the displacement of an input element (8) may control the supply of at least atmospheric pressure to the working chamber (3) in order to achieve a pressure difference at the movable wall (5). For improved braking force assistance during emergency braking operations, an armature (18) cooperating with a permanent magnet (19) is provided in the control valve housing (7) and coupled in actuating direction to the actuating element (8). The armature (18) is spring-biased counter to actuating direction and, in the normal position of the control valve (6), is held at a first distance from the permanent magnet (19).
    Type: Grant
    Filed: June 13, 2002
    Date of Patent: March 16, 2004
    Assignee: Lucas Varity GmbH
    Inventors: Peter Schlüter, Michael Possmann
  • Patent number: 6681680
    Abstract: A vacuum brake booster (10) is described, comprising a vacuum chamber (16) and a working chamber (18) separated from each other by a movable wall (14). The vacuum brake booster (10) includes an emergency braking aid comprising a permanent magnet (38), which is disposed in the control valve housing (22), and an armature (36A) which cooperates with the permanent magnet (38) and in the event of emergency braking is drawn into abutment with the permanent magnet (38), with the result that a control valve (20) is held open for the supply of atmospheric pressure or above-atmospheric pressure to the working chamber (18). The permanent magnet (38) and the armature (36A) form a two-component magnetic module (36A, 38), of which a first component is rigidly coupled to an actuating piston (28) of the brake booster (10).
    Type: Grant
    Filed: October 18, 2002
    Date of Patent: January 27, 2004
    Assignee: Lucas Automotive GmbH
    Inventor: Peter Schlüter
  • Patent number: 6672198
    Abstract: A vacuum brake booster (10) is described, having a vacuum chamber (16) and a working chamber (18) separated from one another by a movable wall (14), and a control valve (20), which comprises a housing (12) coupled workingly to the movable wall (14) and which to achieve a pressure difference at the movable wall (14) is capable of controlling the supply of atmospheric pressure or above-atmospheric pressure to the working chamber (18) in dependence upon the displacement of an actuating piston (28). The vacuum brake booster (10) has an emergency braking aid comprising a permanent magnet (38) and an armature (36), which cooperates with the permanent magnet (38) and is resiliently biased counter to actuating direction and during an emergency braking operation is drawn into abutment with the permanent magnet (38), with the result that the control valve (20) is held open for the supply of atmospheric pressure to the working chamber (18).
    Type: Grant
    Filed: April 30, 2003
    Date of Patent: January 6, 2004
    Assignee: Lucas Automotive GmbH
    Inventors: Ludwig Friedsam, Heinrich Plewnia, Gerd Puscher, Peter Schlüter
  • Patent number: 6672197
    Abstract: An automatic brake booster includes a solenoid and a solenoid plunger which allow a flow path in a valve mechanism to be switched without depression of a brake pedal. The solenoid plunger comprises a rear member on which an atmosphere valve seat is formed, a front member which is disposed to be displaceable with respect to the rear member, and a first spring disposed between the both members. When a current fed to the solenoid is less than a given value, the first spring remains inactive while when the current exceeds the given value, the first spring becomes flexed to reduce a clearance between the rear member and a holder which forms part of a magnetic path of the solenoid together with the rear member. When the booster operates as an automatic brake, a gentle brake operation which allows a precise control with a reduced brake output and a quick brake operation with an increased brake output can be simultaneously achieved in a preferred manner.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: January 6, 2004
    Assignee: Bosch Braking Systems Co., Ltd.
    Inventors: Hidefumi Inoue, Naohito Saito
  • Patent number: 6634724
    Abstract: An electrically driven brake booster (1) includes an input member (4) disposed in operative association with a brake pedal (12), an output member (5) disposed in operative association with the master cylinder (6), and drive transmitting device (10) for translating a rotating motion of a motor (9) into a linear motion to be transmitted to the output member (5). The drive transmitting device (10) comprises a rack (23) formed on the output member (5), and pinions (21, 22) disposed in operative association with the motor (9) and in meshing engagement with the rack (23). Also, reaction transmitting device (8) which transmits a brake reaction to the input member (4) and the output member (5) at a given proportion is provided. In comparison to conventional drive transmitting device, the drive transmitting device (10) of the present invention has a simple construction, a reduced weight and a better transmission efficiency.
    Type: Grant
    Filed: March 8, 2002
    Date of Patent: October 21, 2003
    Assignee: Bosch Braking Systems Co., Ltd.
    Inventors: Kazuo Kobayashi, Hidefumi Inoue
  • Patent number: 6634275
    Abstract: An automatic brake booster 1 includes a solenoid 8 which causes a back- and forth movement of a solenoid plunger 31 to switch a valve mechanism 6. A second vacuum valve seat member 11 including a second vacuum valve seat 12 which is juxtaposed with a first vacuum valve seat 10 on a valve body 3 and a pressure responsive area 34 subject to a pressure of a variable pressure chamber and a pressure of a constant pressure chamber is slidably mounted on the valve body. The effect of the pressure differential acting upon the pressure responsive area is balanced with the force resulting from the excitation of the solenoid plunger 31 to deliver a brake output which corresponds to the force. The invention enables a high accuracy control of a brake output during an automatic brake operation.
    Type: Grant
    Filed: November 15, 2001
    Date of Patent: October 21, 2003
    Assignee: Bosch Braking Systems Co., Ltd.
    Inventors: Hiroyuki Yamaga, Hidefumi Inoue
  • Patent number: 6609453
    Abstract: A controller of a vacuum brake power booster which amplifies an input force of a brake pedal and outputs the amplified force to a brake device, is characterized by comprising a control signal generating means generating a plurality of kinds of signals for controlling the vacuum brake power booster, and a means for switching or selecting the plurality of signals on the basis of an input different from one of the brake pedal.
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: August 26, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Satoru Kuragaki, Tokuji Yoshikawa
  • Publication number: 20030154852
    Abstract: A solenoid valve includes a valve housing having first, second, and third valve ports, an actuation rod, a first tip valve actuated by the first end of the actuation rod to allow or block fluid passage through the first valve port, and a second tip valve actuated by the second end of the actuation rod to allow or block passage through the second valve port. A vacuum booster diaphragm subassembly includes a vacuum booster diaphragm and a grommet attached to the vacuum booster diaphragm. A vacuum booster assembly includes the above-described solenoid valve, includes primary and secondary diaphragms, and includes the above-described grommet attached to the secondary diaphragm, wherein the secondary diaphragm is the above-described vacuum booster diaphragm.
    Type: Application
    Filed: April 4, 2002
    Publication date: August 21, 2003
    Inventors: Timothy A. Haerr, Gary C. Fulks, Timothy M. Schlangen
  • Patent number: 6568182
    Abstract: Electronically controllable brake booster with a vacuum chamber and a pressure chamber, which are separated from one another by a moveable wall, a control valve arrangement, which can be actuated by means of an electromagnetic actuating device and via which a pressure difference between the pressure and the vacuum chamber can be set, wherein the control valve arrangement takes up a holding position, a pressure build-up position, a pressure reduction position in accordance with a current generated as correcting variable by an electronic control unit and flowing through the electromagnetic actuating device, a cylinder-piston arrangement, which is connected to the brake booster and comprises a piston, coupled to a brake pedal, of a hydraulic cylinder which has a hydraulic connection leading to a wheel brake, a sensor arrangement for detecting a signal which is correlated with the pressure of the hydraulic cylinder and which reproduces the controlled variable, wherein the electronic control unit establishes a com
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: May 27, 2003
    Assignees: Lucas Industries plc, Daimler-Chrysler AG
    Inventors: Christoph Linden, Lorenz Maack
  • Patent number: 6520063
    Abstract: A vacuum brake booster (10) has a vacuum chamber (18) and a working chamber (20), which are separated in a pressure-proof manner from one another by a movable wall (16). A control valve (22) having a housing (24), which is workingly coupled to the movable wall (16) and in which a first valve seat (64) is disposed, in order to achieve a pressure difference at the movable wall (16) controls the supply of at least atmospheric pressure to the working chamber (20) in dependence upon the displacement of an input element (26), which is coupled to the first valve seat (64), of the brake booster (10). Disposed in the control valve housing (24) is an armature (38), which cooperates with a permanent magnet (40) and which is coupled on the one hand to the input element (26) in actuating direction and on the other hand to the first valve seat (64).
    Type: Grant
    Filed: February 8, 2002
    Date of Patent: February 18, 2003
    Assignee: Lucas Industries plc
    Inventor: Peter Schlüter
  • Patent number: 6516701
    Abstract: The present invention relates to a brake force booster for automotive vehicles which includes a booster housing whose interior space is subdivided by a movable wall into a working chamber and a vacuum chamber, and a control housing which carries the movable wall and in which a control valve is arranged for controlling a pressure differential that acts upon the movable wall, the said control valve being operable by an operating rod by way of a valve piston and by an electromagnet. According to the present invention, the brake force booster is characterized in that the electromagnet is actuatable in dependence on the relative displacement between the valve piston and the control housing detected by a sensor. This arrangement makes possible a very simple control of a brake assist function because the signal of the sensor can be used both for the activation and the deactivation of the electromagnet.
    Type: Grant
    Filed: October 27, 2000
    Date of Patent: February 11, 2003
    Assignee: Continental Teves AG & Co., OHG
    Inventors: Peter Drott, Michael Vogt, Hans-Jörg Feigel, Jose Gonzales, Horst Krämer, Thorsten Neu
  • Patent number: 6516702
    Abstract: A servobrake having a rigid jacket defined by a first shell joined to a second shell by through tie-bars to create variable volume front and rear chambers. The front chamber is permanently connected to a first pressure source whereas the rear chamber is selectively connected to the first pressure source and a second pressure source. The servobrake including a pressure sensor for the measurement of the pressure inside of the front and rear chambers. The pressure sensor is characterized by being attached to a front end of the through-tie bar whereas the tie-bar is characterized by a hollowed-out body with a hollow inner needle sealingly retained therein. The hollow inner needle defines a first chamber while a second chamber is defined by a space between the inner hollow needle and the hollowed-out body. The hollowed-out body has first ports therein for connecting the rear chamber with the first chamber through which pressure present in the rear chamber is transmitted to the pressure sensor.
    Type: Grant
    Filed: November 16, 2001
    Date of Patent: February 11, 2003
    Assignee: Robert Bosch GmbH
    Inventors: Gendrin Stéphane, Jean Fourcade, Cédric Leboisne, Jean-Marc Piel
  • Patent number: 6505539
    Abstract: A vacuum brake booster (10) has a vacuum chamber (18) and a working chamber (20) separated from one another in a pressure-proof manner by a movable wall (16). A control valve (22), which comprises a housing (24) workingly coupled to the movable wall (16), has a first valve seat (50), which is disposed in the housing (24) and to achieve a pressure difference at the movable wall (16) is capable of controlling the supply of at least atmospheric pressure to the working chamber (20) in dependence upon the displacement of an input element (26) coupled to the first valve seat (50). For improved boosting of the brake force during emergency braking operations, an armature (38), which cooperates with a permanent magnet (40), is provided in the control valve housing (24) and is rigidly coupled on the one hand to the actuating element (26) in actuating direction and on the other hand to the first valve seat (50).
    Type: Grant
    Filed: February 2, 2001
    Date of Patent: January 14, 2003
    Assignee: Lucas Industries plc
    Inventor: Peter Schlüter
  • Patent number: 6491356
    Abstract: The invention relates to a brake system including a brake booster. A pneumatic pressure operated brake booster VBB or a liquid pressure operated brake booster includes a valve mechanism which is urged by a force of depression applied to a brake pedal BP to switch a flow path to cause the brake booster to develop an output which depends on the magnitude of the force of depression. A solenoid SOL urges the valve mechanism in the same direction as or in the opposite direction from the force of depression. A controller ECU is responsive to a braking effort increase/decrease demand signal to increase or decrease the urging force which is applied by the solenoid to the valve mechanism, thus increasing or decreasing the output from the brake booster. An output from the brake booster can be freely controlled independently from the force of depression applied to the brake pedal in response to a braking effort increase/decrease demand.
    Type: Grant
    Filed: January 29, 2001
    Date of Patent: December 10, 2002
    Assignees: Bosch Braking Systems Co., Ltd., Denso Corporation
    Inventors: Osamu Kanazawa, Yoshiyasu Takasaki, Michio Kobayashi, Hiroshi Ohsaki, Masahiro Ikeda, Hiroyuki Oka, Hiroaki Niino, Kazuya Maki, Mamoru Sawada
  • Patent number: 6425312
    Abstract: The present invention provides a brake booster that, although simple in construction, capable of adjusting the braking force derived by operation of a solenoid mechanism without worsening the braking response. In the brake booster according to the present invention, when a movable member (34) is shifted toward the rear side by electromagnetic force of a solenoid (31), the shifting movement is transmitted to a valve seat member (21) through pins (50) to open an atmospheric valve (27) through which air is introduced into a variable pressure chamber (9,10), whereby a pressure difference is created between the variable pressure chamber and a constant pressure chamber and generates booster output (thrust output force).
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: July 30, 2002
    Assignee: Tokico, Ltd.
    Inventors: Toshio Takayama, Kunihiro Matsunaga, Takuya Obata
  • Patent number: 6422122
    Abstract: The invention utilizes the finding that a pressure variation or pressure difference between two chambers of a brake booster is a parameter of considerable influence on the behavior of a brake booster control valve arrangement in the operation of the brake booster. Starting from a holding position for the control valve arrangement, pressure levels related to changeovers from the holding position to a first pressure changing position and a second pressure changing position, respectively, are determined. Depending on the thus determined pressure level differences, current values for an actuation of the control valve arrangement defining upper and lower limits for the holding position are adjusted.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: July 23, 2002
    Assignee: Lucas Industries Public Limited Company
    Inventors: Christoph Linden, Lothar Zeuner
  • Patent number: 6422123
    Abstract: In an electronically controllable brake booster a value is sensed which is characteristic for the actual pressure characteristic in the pressure chamber. The actual pressure characteristic is checked for the existence of periodic oscillation components of a predetermined frequency band with a predetermined minimum amplitude. Upon the existence of such periodic oscillation components, the current flowing through an electromagnetic actuator for a control valve arrangement of the brake booster is decreased by a first predetermined value for a first pressure changing position. Further, the current for a second pressure changing position is decreased by second predetermined value.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: July 23, 2002
    Assignee: Lucas Industries plc
    Inventors: Christoph Linden, Gregor Godlewsky
  • Publication number: 20020062731
    Abstract: An automatic brake booster 1 includes a solenoid 8 which causes a back-and forth movement of a solenoid plunger 31 to switch a valve mechanism 6. A second vacuum valve seat member 11 including a second vacuum valve seat 12 which is juxtaposed with a first vacuum valve seat 10 on a valve body 3 and a pressure responsive area 34 subject to a pressure of a variable pressure chamber and a pressure of a constant pressure chamber is slidably mounted on the valve body. The effect of the pressure differential acting upon the pressure responsive area is balanced with the force resulting from the excitation of the solenoid plunger 31 to deliver a brake output which corresponds to the force. The invention enables a high accuracy control of a brake output during an automatic brake operation.
    Type: Application
    Filed: November 15, 2001
    Publication date: May 30, 2002
    Inventors: Hiroyuki Yamaga, Hidefumi Inoue
  • Publication number: 20020056361
    Abstract: A vacuum servo unit includes a constant pressure chamber and a variable pressure chamber in a housing, a power piston, an output member, an input member, a plunger, a valve mechanism, and an actuator. The actuator is disposed in the power piston for moving the plunger in the forward and rearward directions. The outer periphery of the actuator is provided with a concave or recessed portion serving as a communicating passage between the constant pressure chamber and the variable pressure chamber. The concave or recessed portion is in the form of a notch defined in a yoke enclosing the solenoid coil of the actuator. The communicating passage is constituted by the notch and the inner periphery of a cylindrical portion of the power piston at the front side of the power piston.
    Type: Application
    Filed: October 29, 2001
    Publication date: May 16, 2002
    Inventors: Akihiko Miwa, Kaoru Tsubouchi, Tetsuaki Tsuzuki
  • Patent number: 6386087
    Abstract: The present invention provides a control booster which is capable of appropriately detecting a pedal-operated brake operation during an automatic brake operation. For moving a stop key from a position on a side of a rear-side abutment surface (where a reaction force of a switch acting on a switch operating rod and a spring force of a switch spring are balanced) toward an intermediate position, when the stop key is located on a side of the rear-side abutment surface, only a return force of the spring acts on a contact operating element of the switch. On the other hand, when the stop key moves toward the intermediate position, an abutment portion is separated from the contact operating element (that is, the switch operating rod moves in a direction for separation relative to the switch), so that no load is applied to the contact operating element.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: May 14, 2002
    Assignee: Tokico Ltd.
    Inventors: Toshio Takayama, Kunihiro Matsunaga, Takuya Obata
  • Patent number: 6374721
    Abstract: A brake vacuum booster assembly is provided that includes a power piston with a two-piece member movable relative thereto for opening a valve when a brake pedal is applied. The two-piece member includes a cylinder and a cylinder cap. The cylinder has a passageway vented to atmosphere for providing air to air chamber in the booster. An electric actuator is retained within a cavity in the cylinder for coacting with the valve to more quickly open the valve during a rapid brake pedal apply. A cylinder cap is connected to an end of the cylinder for retaining the electric actuator within the cavity. The cylinder cap has an opening aligned with the passageway. A retaining mechanism is arranged between the cylinder and the cylinder cap for preventing axial and rotational movement of the cylinder cap relative to the cylinder to securely retain the electric actuator within the cavity and maintain alignment of the opening and passageway.
    Type: Grant
    Filed: August 8, 2000
    Date of Patent: April 23, 2002
    Assignee: Delphi Technologies, Inc.
    Inventors: James William Zehnder, II, Gary Chris Fulks, Larry R Miller
  • Patent number: 6347570
    Abstract: A valve mechanism of an automatic brake booster comprises a vacuum valve seat formed on a valve body to face forward, an atmosphere valve seat formed on the rear portion of a valve plunger, and a valve element adapted to be seated on the both valve seats from the front side thereof. The valve plunger is associated with a solenoid plunger which allows the valve plunger to extend therethrough to permit a relative displacement therebetween and which is integrally connected thereto at an advanced end position thereof. A resilient member is provided which normally maintains the solenoid plunger at the advanced end position relative to the valve plunger. This simplifies a valve mechanism in comparison to a conventional automatic brake booster, thus improving the reliability.
    Type: Grant
    Filed: August 14, 2000
    Date of Patent: February 19, 2002
    Assignee: Bosch Braking Systems Co., Ltd.
    Inventors: Hidefumi Inoue, Naohito Saito
  • Patent number: 6345565
    Abstract: A vacuum servo booster 10 for vehicle brake systems includes a housing 14, movable walls 17 and 20, a power piston 22, an input member 28, an input rod connected to a brake pedal 80, a valve mechanism 34, an output rod 49, and an actuator 41. In the vacuum servo booster 10, the input rod 27 has a front portion 271 and a rear portion 272 which are telescopically connected at a portion 273 within the power piston 22.
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: February 12, 2002
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Kaoru Tsubouchi, Akihiko Miwa
  • Patent number: 6334383
    Abstract: A vacuum servo apparatus capable of regulating the output accompanying the activation of an actuator to the maximum output or less includes a housing, movable walls located within the housing, a power piston, an input member, a valve mechanism, an output rod, a reaction disc and an actuator. A rear member forming part of an input member is able to move forward by a predetermined stroke with respect to a front member forming part of the input member so that the input member can be moved backward by the reaction disc in accordance with the activation of the actuator to cut off communication between rear chambers and the atmosphere.
    Type: Grant
    Filed: April 15, 1999
    Date of Patent: January 1, 2002
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Kaoru Tsubouchi, Akihiko Miwa
  • Patent number: 6332391
    Abstract: In an automatic brake booster, a sleeve 18 constituting a valve mechanism 15 has a drive portion 50 disposed on the front side, a valve portion 51 forming a second valve seat 19, a mating portion 52 for mating with a valve seat portion when the drive portion is moved forward, and a conical spring 53 disposed between the drive portion and the valve seat portion and used for separating both members from each other. The conical spring is compressed during the normal braking operation so as to make the opening amount of the second valve seat greater than that during the automatic braking operation. Moreover, a plate plunger 40 for transmitting braking counterforce is relatively displaceably provided and a first member 71 and a second member 71 for mutually contacting a reaction disc 41 is also provided, so that the braking counterforce of the first member is transmitted to the sleeve during the automatic braking operation.
    Type: Grant
    Filed: July 9, 1999
    Date of Patent: December 25, 2001
    Assignee: Jidosha Kiki Co., Ltd.
    Inventors: Masahiro Ikeda, Yoshiyasu Takasaki, Hidefumi Inoue
  • Patent number: 6321633
    Abstract: The present invention provides a booster in which magnitude of output can be adjusted also by an operation of a solenoid mechanism. An armature (13) is shifted to the right (in FIG. 1) in opposition to a returning spring by applying electricity to a solenoid (39), with the result that a space (80) on one end of the armature is communicated with a constant pressure chamber (5) through a passage (T3). When an electromagnetic force acting on the armature (13) exceeds a predetermined value, a distal end of a valve member (28) is shifted to the right (in FIG. 1) via a cylindrical member (31) to open an atmospheric valve (34), thereby introducing the atmosphere into a variable pressure chamber (6). The pressure in the variable pressure chamber is applied to the other end of the armature and the difference in the pressure tends to move the armature toward its home position.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: November 27, 2001
    Assignee: Tokico Ltd.
    Inventors: Toshio Takayama, Kunihiro Matsunaga, Takuya Obata
  • Patent number: 6311606
    Abstract: A vacuum servo unit or booster for a vehicle brake system includes a housing, movable walls disposed in the housing, a power piston, an input member, an atmospheric pressure valve seat, a negative pressure valve seat, a control valve having an atmospheric pressure seal portion and a negative pressure seal portion, an output rod, a reaction disc, and an actuator. The vacuum servo booster is designed so that the force produced from the output rod varies with the driving force of the actuator upon activation of the actuator.
    Type: Grant
    Filed: September 30, 1999
    Date of Patent: November 6, 2001
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Kaoru Tsubouchi, Akihiko Miwa
  • Patent number: 6298940
    Abstract: A hydraulic power steering system for motor vehicles which is suitable for a steer-by-wire operation, having a steering handle which can be operated by a driver. A servo motor operates steered vehicle wheels. A servo valve operates the servo motor and is constructed as a rotary slide valve arrangement having mutually rotationally movable control parts which, together, are pushed by a spring system into a normal position relative to one another. An actuator is coupled with the control parts for their rotational adjustment relative to one another and operates the servo valve. A desired steering angle value generator is operated by way of the manual steering handle. An actual steering angle value generator is operated by way of the steered vehicle wheels. An automatic control circuit operates the actuator as a function of a comparison of the desired and actual steering angles.
    Type: Grant
    Filed: June 22, 1999
    Date of Patent: October 9, 2001
    Assignee: DaimlerChrysler AG
    Inventors: Hubert Bohner, Martin Moser, Reinhold Schneckenburger
  • Publication number: 20010025565
    Abstract: The present invention provides a brake booster that, although simple in construction, capable of adjusting the braking force derived by operation of a solenoid mechanism without worsening the braking response. In the brake booster according to the present invention, when a movable member (34) is shifted toward the rear side by electromagnetic force of a solenoid (31), the shifting movement is transmitted to a valve seat member (21) through pins (50) to open an atmospheric valve (27) through which air is introduced into a variable pressure chamber (9,10), whereby a pressure difference is created between the variable pressure chamber and a constant pressure chamber and generates booster output (thrust output force).
    Type: Application
    Filed: March 21, 2001
    Publication date: October 4, 2001
    Applicant: Tokico, Ltd.
    Inventors: Toshio Takayama, Kunihiro Matsunaga, Takuya Obata
  • Publication number: 20010017077
    Abstract: A controller of a vacuum brake power booster which amplifies an input force of a brake pedal and outputs the amplified force to a brake device, is characterized by comprising a control signal generating means generating a plurality of kinds of signals for controlling the vacuum brake power booster, and a means for switching or selecting the plurality of signals on the basis of an input different from one of the brake pedal.
    Type: Application
    Filed: February 23, 2001
    Publication date: August 30, 2001
    Applicant: HITACHI, LTD.
    Inventors: Satoru Kuragaki, Tokuji Yoshikawa
  • Patent number: 6272969
    Abstract: A pneumatic brake booster (10) has a booster housing (12), the interior of which is subdivided by at least one movable wall (22) into a vacuum chamber (24) and a working chamber (26). Projecting into the booster housing (12) is a control valve (28) which, after a response force acting counter to its operating direction has been overcome, controls a pneumatic pressure difference acting upon the movable wall (22). The control valve (28) is operable both by means of a mechanical input element (36) and, independently thereof, by means of an electromagnetic arrangement (48) comprising a coil (58) and an armature (50), which are displaceable relative to one another along the operating direction.
    Type: Grant
    Filed: May 10, 2000
    Date of Patent: August 14, 2001
    Assignee: Lucas Industries plc
    Inventors: Lothar Zeuner, Christoph Linden
  • Patent number: 6253656
    Abstract: A sensor assembly for a vacuum brake booster (10) comprises a housing (48) arranged outside the brake booster housing (12), in which a differential pressure sensor (56) is located. For connecting the differential pressure sensor (56) with a working chamber (16′) of the brake booster (10), the housing (48) has a first air duct (50) which extends from the sensor assembly (46) to the working chamber (16′) of the brake booster (10). In addition, the sensor assembly (46) has a second air duct (52) which extends into a vacuum chamber (18′) of the brake booster (10) in order to connect the differential pressure sensor (56) with said vacuum chamber (18′). A plug-type or socket-type connector (64) for a further sensor is provided in particular on the side of the sensor assembly (46) which is opposite the air ducts (50, 52).
    Type: Grant
    Filed: January 5, 2000
    Date of Patent: July 3, 2001
    Assignee: Lucas Industries Public Limited Company
    Inventor: Leo Gilles
  • Patent number: 6250200
    Abstract: A brake booster 1 of tandem type includes a solenoid 16 within a valve body 6. The solenoid 16 is provided with a forwardly disposed holder 42 and a rearwardly disposed yoke 43, with a spool 44 held sandwiched therebetween and with a piston 56 disposed to be moveable around the inner periphery. A tubular guide 56A is formed on the front portion of the piston 56 while an annular guide 56B is formed on the rear portion of the piston 56. The tubular guide 56A is slidably fitted into the inner periphery of the holder 42 while the annular guide 56B is slidably fitted into the inner periphery of the yoke 43. When the solenoid 16 is energized to cause the piston 56 to move back and forth relative to the holder 42 and the yoke 43, this movement is guided by the both guides 56A, 56B. This arrangement permits a smooth back-and-forth movement of the piston 56 as compared with the prior art.
    Type: Grant
    Filed: October 22, 1999
    Date of Patent: June 26, 2001
    Assignee: Bosch Braking Systems Co., Ltd.
    Inventors: Masahiro Ikeda, Yoshiyasu Takasaki, Naohito Saito
  • Patent number: 6227099
    Abstract: A brake power assist unit for motor vehicles, the control valve of which can be electrically actuated by means of an electromagnet which actuates a third sealing seat that allows ventilation of the operating chamber. In order to stabilize the characteristic of the load system formed by the armature of the electromagnet, a sleeve that carries the third sealing seat and the valve body of the control valve by means of constructive modifications of the control valve of the externally actuated brake power assist unit, in particular, during the pressure reduction phase, the invention proposes means that allow a controlled pneumatic pressure compensation between the operating chamber and the vacuum chamber or a reduction in the force to be generated by the electromagnet during the pressure reduction phase, i.e., during the return movement of the third sealing seat from the valve body.
    Type: Grant
    Filed: January 15, 1999
    Date of Patent: May 8, 2001
    Assignee: ITT Manufacturing Enterprises, Inc.
    Inventors: Manfred Kahrs, Alfred Eckert, Thomas Berthold, Michael Vogt, Christof Klesen
  • Patent number: 6170382
    Abstract: A negative-pressure booster is provided with a housing, two movable walls, a power piston, an input member, an air valve seat, a negative-pressure valve seat, a control valve having an air sealing valve portion and a negative-pressure sealing portion, an output rod, an reaction disc, a slider valve, and an actuator. The output of the negative-pressure booster can be adjusted by adjusting the driving force of the actuator.
    Type: Grant
    Filed: March 22, 1999
    Date of Patent: January 9, 2001
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Kaoru Tsubouchi, Akihiko Miwa