Plural Input Signal Means For Single Motor Valve (453) Patents (Class 91/367)
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Patent number: 6272969Abstract: 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: GrantFiled: May 10, 2000Date of Patent: August 14, 2001Assignee: Lucas Industries plcInventors: Lothar Zeuner, Christoph Linden
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Patent number: 6253656Abstract: 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: GrantFiled: January 5, 2000Date of Patent: July 3, 2001Assignee: Lucas Industries Public Limited CompanyInventor: Leo Gilles
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Patent number: 6250200Abstract: 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: GrantFiled: October 22, 1999Date of Patent: June 26, 2001Assignee: Bosch Braking Systems Co., Ltd.Inventors: Masahiro Ikeda, Yoshiyasu Takasaki, Naohito Saito
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Patent number: 6227099Abstract: 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: GrantFiled: January 15, 1999Date of Patent: May 8, 2001Assignee: ITT Manufacturing Enterprises, Inc.Inventors: Manfred Kahrs, Alfred Eckert, Thomas Berthold, Michael Vogt, Christof Klesen
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Patent number: 6170382Abstract: 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: GrantFiled: March 22, 1999Date of Patent: January 9, 2001Assignee: Aisin Seiki Kabushiki KaishaInventors: Kaoru Tsubouchi, Akihiko Miwa
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Patent number: 6164183Abstract: A vacuum booster for a vehicle brake system provides a working pressure valve seat on a valve member axially movable with respect to an input member. A rotary electric motor within the booster has an output shaft coupled through rotary to linear motion conversion apparatus to move the valve member with its working pressure valve seat relative to the input member. The combination of elements is designed as a drop-in replacement for a standard air valve member. The motion conversion apparatus provides much greater mechanical force than a linear solenoid; and this allows a more straightforward design of the valve arrangement, particularly the use of a high friction seal such as a simple "O"-ring in a groove. In further contrast to a linear solenoid, it further provides positive control of the working pressure valve seat position and an extended range of travel with constant force throughout the range.Type: GrantFiled: February 10, 1999Date of Patent: December 26, 2000Assignee: Delphi Technologies, Inc.Inventors: Gary Chris Fulks, Donald Lee Parker, James William Zehnder II
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Patent number: 6161463Abstract: A negative pressure booster equipped with an electromagnetic auxiliary control means can introduce air into an operation chamber in correspondence with normal braking and urgent braking by a single valve element which is simple in structure and provides good response. A valve element is supported for to-and-fro movement within a prescribed stroke in the input member and spring-biased to the side of the retraction limit. A solenoid and fixed core of an electromagnetic auxiliary control means is fixed to the valve cylinder coupled with booster pistons. A movable core opposite to the fixed core is coupled with the valve element. When the solenoid is excited while the input member advances, the movable core is operated so that the advancement quantity (communication opening degree between the operation chambers and air) of the valve element for the valve cylinder exceeds that of the valve element operated by the input member.Type: GrantFiled: November 18, 1998Date of Patent: December 19, 2000Assignee: Nissin Kogyo Co., Ltd.Inventor: Toshiyuki Suwa
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Patent number: 6155156Abstract: A brake booster includes a solenoid disposed within a valve body. When the solenoid is energized under the inoperative condition of the brake booster, a piston associated with the solenoid is moved to its operative position to close a vacuum valve while opening an atmosphere valve. This allows the brake booster to be operated as an automatic brake without depressing a brake pedal. The brake booster also comprises output restriction means which may comprise a spring 55 shown in FIG. 1, for example, whereby as the output increases when the brake booster is operated as an automatic brake, the output restriction means operates to cease an increase in the output. With this arrangement, if the solenoid is energized inadvertently independently from the intent of a driver, the occurrence of a quick braking action is avoided, but a gentle braking action is assured, thus improving the safeguard.Type: GrantFiled: November 6, 1998Date of Patent: December 5, 2000Assignees: Jidosha Kiki Co., Ltd., Denso CorporationInventors: Yoshiyasu Takasaki, Mamoru Sawada, Yuzo Imoto
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Patent number: 6135007Abstract: A vacuum servo apparatus capable of reducing variations in the input and output characteristics includes a housing, movable walls, a power piston, an input member, an input rod, a valve mechanism, an output rod and a reaction disk. The length of the input member in the front and rear direction is increased or decreased in accordance with a change in the air temperature.Type: GrantFiled: June 29, 1999Date of Patent: October 24, 2000Assignee: Aisin Seiki Kabushiki KaishaInventor: Kaoru Tsubouchi
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Patent number: 6119577Abstract: A tandem brake booster includes a solenoid within a valve body, and the solenoid may be energized to move a first tubular member disposed on the valve body rearward. When an input shaft is driven forward in the inoperative condition of the brake booster, a vacuum valve is closed while an atmosphere valve is opened in the similar manner as occurs in the prior art, thus actuating the tandem brake booster 1. When an input or the force of depression applied to a brake pedal rises to a given value X during the operative condition of the brake booster, the solenoid is energized, whereupon the first tubular member is moved rearward relative to the valve body, and the valve element is also moved rearward. This opens the atmosphere valve which has been closed during the servo balance condition, allowing a further introduction of the atmosphere into variable pressure chambers B, D, enabling a rise in the output even though the input remains unchanged.Type: GrantFiled: November 6, 1998Date of Patent: September 19, 2000Assignees: Jidosha Kiki Co., Ltd., Denso CorporationInventors: Yoshiyasu Takasaki, Mamoru Sawada, Yuzo Imoto
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Patent number: 6082241Abstract: An automatic brake booster includes a solenoid which drives a plunger, forming part of a valve mechanism, forward to switch a flow path in the valve mechanism, separately from an input shaft. A piston is mounted on the plunger, and the atmospheric pressure is introduced into an atmospheric pressure chamber disposed forwardly of the piston while a pressure which prevails in constant pressure chambers A, C is introduced into a negative pressure chamber disposed rearwardly of the piston, thus urging the piston rearward. Preferably, the piston has a pressure responsive area which is substantially equal to the pressure responsive area of an atmosphere valve seat formed on a plunger. This arrangement allows a variation in the output from the brake booster to be minimized or reduced substantially to zero if there is a variation in the magnitude of a negative pressure which is introduced into the constant pressure chambers A, C.Type: GrantFiled: January 19, 1999Date of Patent: July 4, 2000Assignees: Jidosha Kiki Co., Ltd., Denso CorporationInventors: Isao Kobayashi, Mamoru Sawada, Yuzo Imoto
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Patent number: 6070514Abstract: The present invention discloses a brake force booster for automotive vehicles having a control valve which is operable independently of an actuating rod displacing a valve piston, by way of an electromagnet which actuates a third sealing seat. Displacement of the sealing seat in opposition to the actuating direction of the brake force booster permits ventilating the working chamber. To eliminate all pneumatically induced force components in an independent activation, according to the present invention, a permanent pneumatic connection is provided between a pneumatic chamber delimited in the control housing by the valve member and the vacuum chamber, and in that both a second sealing seat which is provided on the valve piston and used to ventilate the working chamber, the third sealing seat, and the valve member in its sealing lip delimiting the pneumatic chamber in the control housing have almost identical diameters.Type: GrantFiled: April 5, 1999Date of Patent: June 6, 2000Assignee: Continental Teves AG & CO. OHGInventors: Mark Bayens, Thomas Berthold, Peter Drott, Horst Kramer
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Patent number: 6053090Abstract: A vacuum brake power booster for automotive vehicles has a booster housing with a movable wall and a control housing which carries the movable wall. The control housing includes a main part which is accommodated in a guide tube along with a cover part axially slipped onto the main part. A solenoid for actuating a control valve is positioned in the control housing, and one axial side of the solenoid is mounted in the main part and the other axial side thereof is mounted in the cover part. The cover part has axially projecting centering segments which elastically deform and center the main part in a clearance-free manner during the assembly of the control housing.Type: GrantFiled: February 2, 1998Date of Patent: April 25, 2000Assignee: ITT Manufacturing Enterprises Inc.Inventors: Peter Drott, Frank Stohr, Horst Kramer
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Patent number: 6044750Abstract: A brake booster (10) for a vehicle brake system comprises a housing (12) which is divided, by means of at least one movable wall (14), into a vacuum chamber (18) and a working chamber (16). A control valve arrangement (20), which is associated to the brake booster (10) and which optionally connects the working chamber (16) to atmospheric pressure or to a vacuum, comprises a control valve housing (21) which is connected to the movable wall (14) for joint relative movement with respect to the housing (12). An electromagnetic actuation unit (26) is received in the control valve housing (21), said actuation unit having a solenoid coil (44), a magnet armature (28) operating against the spring bias and which is rigidly coupled to a first valve seat (32) of the control valve arrangement (20), and an armature counter-element (46). For improving the magnetic flux in the electromagnetic actuation unit (26) while simultaneously reducing the number of parts, an insert (92) made of diamagnetic and preferably lightweight.Type: GrantFiled: April 9, 1999Date of Patent: April 4, 2000Assignee: Lucas Industries public limited companyInventors: Rudiger Eick, Hans-Werner Renn, Peter Polke, Christoph Beuerle, Ulrich Danne
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Patent number: 6044749Abstract: A pneumatic brake booster having a casing (10) which is divided in a leaktight fashion by at least one movable wall (12) into a front chamber (14) and a rear chamber (16). A pneumatic piston (20) attached to the movable wall (12) has a tubular rear part (22) which extends through the casing (10). A three-way valve (36) which slides in a bore (26) of a pneumatic piston (20) has a valve element which interacts with a first valve seat (28a) formed on a plunger (28) and a second valve seat (20a) formed on the pneumatic piston (20) in response to an operating rod (30) moving a plunger (28) to selectively connects the rear chamber (16) to the front chamber (14) and to a source of high pressure to develop a pressure differential across the movable wall (12). A rear position of rest for the plunger (28) wherein the rear chamber (16) is connected to the front chamber (14) is defined by a front end (32) of a sleeve (34) located in the tubular rear part (22) of the pneumatic piston (20).Type: GrantFiled: July 24, 1998Date of Patent: April 4, 2000Assignee: BoschSistemas de Frenado S.L.Inventor: Juan Simon Bacardit
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Patent number: 6030053Abstract: An automatic emergency brake system for an automotive vehicle with an assistor having a backward push rod connected to a forward push rod coupled with a master cylinder's piston via a power piston and pushing the power piston so as to augment a force applied to a brake pedal by a driver, including a partition fixed to the backward push rod; a return spring disposed between the partition and a poppet; moving stoppers each having a moving rod, going in and out of a backward pushing rod housing, to support the back of the partition; an emergency spring disposed compressed between the moving stoppers and a housing end; a controller electrically connected to the moving stoppers to output a driving signal to the moving stoppers in accordance with a deceleration; and a deceleration/acceleration sensor electrically connected to the controller to input a reduced speed of the vehicle to the controller.Type: GrantFiled: November 12, 1997Date of Patent: February 29, 2000Assignee: Hyundai Motor CompanyInventor: Jae-Wook Jeon
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Patent number: 6006648Abstract: To extend the control range of the pressure control in a brake system which is equipped with a brake power booster that is operable irrespective of the driver's wish, preferably electromagnetically, according to the present invention, the hydraulic pressure introduced into a master brake cylinder connected downstream of the brake power booster is determined and, following a comparison with a preset pressure value signal, is sent to a pressure controller having an output quantity which corresponds to a control current for the solenoid and is supplied to a limiter that determines the limit values of the desired control range, and the output quantity of the limiter is compared with the value of the current supplied to the solenoid. Subsequently, the comparison result is sent to a current controller which generates the voltage to be applied to the solenoid.Type: GrantFiled: January 26, 1998Date of Patent: December 28, 1999Assignee: ITT Manufacturing Enterprises Inc.Inventor: Alfred Eckert
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Patent number: 5979292Abstract: In a method of operating an electromechanically actuatable pneumatic brake booster, an electromagnet which actuates a sealing seat of its control valve is energized in an interval by a short current pulse of maximum current strength with a subsequent ramp-like current rise, and the current being furnished to the electromagnet is decreased when a fixed value of the pressure that prevails in a master brake cylinder connected downstream of the brake booster is reached. When the hydraulic pressure introduced into the master brake cylinder reaches a nominal value, the current being furnished to the electromagnet is supplied by a pressure controller which maintains the hydraulic pressure constant.Type: GrantFiled: July 2, 1998Date of Patent: November 9, 1999Assignee: ITT Manufacturing Enterprises Inc.Inventors: Christof Klesen, Jochen Fuhrer, Michael Vogt, Heinz Zingel, Thorsten Neu, Michael Zydek, Stefan Krebs, Thomas Berthold
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Patent number: 5937727Abstract: A brake power booster for automotive vehicles has a control valve which is operable by a solenoid irrespective of the driver's wish. In order to adapt the force-travel characteristic curve of the solenoid to the consumer characteristic curve of the control valve exhibiting a drop in force, the present invention discloses an armature having two parts which are movable relative to each other and interact with stops that are axially offset in the housing of the solenoid in the actuating direction of the latter.Type: GrantFiled: February 23, 1998Date of Patent: August 17, 1999Assignee: ITT Manufacturing Enterprises Inc.Inventors: Christof Klesen, Michael Vogt
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Patent number: 5845736Abstract: In a hydraulic power steering for motor vehicles having a steering control element, a position setting unit connected to the steering control element, a control motor connected to the position setting unit by way of a control circuit and a servo valve having control parts which are supported so as to be rotatable relative to each other but operatively interconnected by spring means retaining them in a central open position relative to each other, one of the control parts is operatively connected to the control motor and the other is connected to a steering gear mechanism associated with the steered wheels of the motor vehicle, and a hydraulic servomotor is associated with the vehicle wheel steering mechanism and hydraulically connected to the servo valve to receive hydraulic fluid therefrom depending on the relative rotary positions of the servo valve control parts.Type: GrantFiled: November 8, 1996Date of Patent: December 8, 1998Assignee: Mercedes-Benz AGInventors: Hubert Bohner, Martin Moser
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Patent number: 5845556Abstract: A vacuum brake booster with an automatic braking actuation system of the type which includes an electric actuator assembled with a power piston to effect forward movement of a valve plunger assembly when activated under control of an electronic controller, wherein a depression amount of a brake pedal is detected to calculate a depression speed of the brake pedal based on the detected depression amount, and wherein the electric actuator is activated when the calculated depression speed of a brake pedal exceeds a predetermined threshold value and is deactivated when a release amount of the brake pedal is more than a predetermined value.Type: GrantFiled: December 18, 1996Date of Patent: December 8, 1998Assignee: Aisin Seiki Kabushiki KaishaInventors: Kaoru Tsubouchi, Akihiko Miwa, Hiroaki Aizawa
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Patent number: 5807060Abstract: A removable side shifter attachment attachable to the carriage bar of a lift truck has a frame shiftable with respect to the truck. The frame includes a shifter carriage bar for receiving a lift fork. A hydraulic cylinder attached to the truck carriage bar having rods contacting the frame at its sides is positioned horizontally forwardly of the truck carriage bar and between the truck carriage bar and the shifter carriage bar. The cylinder is positioned generally within a J-shaped portion of the shifter carriage bar so that the cylinder does not extend substantially above or below the carriage bar and does not appreciable add to the overall thickness of the apparatus. The cylinder further includes two axially aligned chambers separated by a central partition, each chamber containing a piston in contact with a respective rod, each piston dividing its respective chamber into interior and exterior portions.Type: GrantFiled: September 24, 1997Date of Patent: September 15, 1998Assignee: Rightline Equipment, Inc.Inventor: Jim D. Hamlik
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Patent number: 5746057Abstract: An electronic control type brake booster having a brake booster; an air path separately formed from a path to which an engine vacuum pressure of said brake booster is applied; a pressure control valve arranged in the air path and driven by a solenoid valve, said pressure control valve providing a pilot pressure to the air path of said brake booster to control the pressure in the air path to a pressure between atmospheric pressure and the engine vacuum pressure; a wrinkled bellows tube connected to a predetermined portion of said air path connected to the pressure control valve; an operational chamber inwardly formed of a movable wall communicated with the bellows tube; a plunger located at an inside portion of the movable wall and formed with an operational chamber and a further chamber according to an operation of the plunger; an annular element arranged between the plunger and the movable wall; and a hole formed at the upper portion of the annular element and communicating with the further chamber.Type: GrantFiled: November 26, 1996Date of Patent: May 5, 1998Assignee: Mando Machinery CorporationInventor: Tae-Young Shim
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Patent number: 5711202Abstract: The present invention is directed to a vacuum servo unit which is characterized in that the negative pressure controlling valve seat is arranged in a position spaced from the atmosphere controlling valve seat in an axial direction, and the atmosphere and the negative pressure controlling seal portions of the control valve are spaced in the axial direction to cooperate with the atmosphere and the negative pressure controlling valve seats. The control valve is in air tightly engagement with an internal surface of the movable power piston at an external surface thereof, and the control valve has a path provided between the atmosphere controlling seal portion and the negative pressure controlling seal portion. Accordingly, when the brake operating member is operated, large quantities of the atmosphere can be introduced to the variable pressure chamber through the clearance between the atmosphere controlling valve seat and the atmosphere controlling seal portion.Type: GrantFiled: July 26, 1996Date of Patent: January 27, 1998Assignee: Aisin Seiki Kabushiki KaishaInventor: Kaoru Tsubouchi
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Patent number: 5611257Abstract: A pneumatic brake booster with a booster housing part includes a vacuum chamber and a working chamber separated therefrom by a movable wall, and a valve body part including a control valve assembly and an electromagnet assembly. The control valve assembly can be actuated both by an actuation rod as well as by the electromagnet assembly, in order to make connections between the vacuum chamber and the working chamber, or between the working chamber and the ambient atmosphere. To improve the heat dissipation and to simplify the assembly the valve body part comprises several separate portions at least the first portion of the valve body part being at least partially designed as a magnetic return of the electromagnet assembly and is coupled with the second portion of the valve body part.Type: GrantFiled: June 7, 1995Date of Patent: March 18, 1997Assignee: Lucas Industries Public Limited CompanyInventor: Rudiger Eick
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Patent number: 5493946Abstract: In a booster housing (10) two chambers (12, 14) separated from each other by a movable wall (16) are connectable to each other by a control valve (20) having a valve body (22) axially movable in common with the wall (16), said valve body having a first valve seat (24), a sealing element (60) axially movable in said valve body and pretensioned in the direction of said first valve seat and a valve barrel (30). The valve barrel (30) has a second valve seat (32) and is pretensioned in the direction of the sealing element (60), is couplingly connected for movement by means of a piston (42) movable by an actuator element (44) in the direction away from the sealing element (60) and is movable by means of a solenoid (40) also independently of the piston (42).Type: GrantFiled: February 3, 1995Date of Patent: February 27, 1996Assignee: Lucas Industries Public Limited CompanyInventor: Peter Schluter
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Patent number: 5483866Abstract: In a booster housing (10) two chambers (12, 14) separated from each other by a movable wall (16) are connectable to each other by a control valve (20) having a valve body (22) axially movable in common with the wall (16), said valve body having a first valve seat (24), a sealing element (60) axially movable in said valve body and pretensioned in the direction of said first valve seat and a valve barrel (30). The valve barrel (30) has a second valve seat (32) and is pretensioned in the direction of the sealing element (60), is couplingly connected for movement by means of a piston (42) movable by an actuator element (44) in the direction away from the sealing element (60) and is movable by means of a solenoid (40) also independently of the piston (42).Type: GrantFiled: February 3, 1995Date of Patent: January 16, 1996Assignee: Lucas Industries Public Limited CompanyInventor: Peter Schluter
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Patent number: 5299488Abstract: An actuator for use in an active suspension system is controlled by a valve responsive to differential pressure across the piston of the actuator. The valve operates to allow movement of the piston so as to reduce the pressure differential. The valve is also controlled by signals indicative of position of and load applied to the actuator.Type: GrantFiled: August 13, 1992Date of Patent: April 5, 1994Assignee: Microhydraulics Inc.Inventors: George Kadlicko, Will Halina
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Patent number: 5230272Abstract: A hydraulic drive is actuated by a CNC means via an electrically actuable valve. The pressure applied to the hydraulic drive or the force excerted by the hydraulic drive is supplied in the form of a signal to a pressure control means or a force control means. The output signal of the pressure- or force control means is supplied via a switch means--shortly prior to reaching the desired position value of the drive--to the electrically operated valve as a control signal. Simultaneously, the output signal of the switch means, which can be supplied to the valve, is interrupted, wherein the switching range shortly prior to reaching the desired position value is smaller than the admissible differential value, determined by the CNC means, i.e.Type: GrantFiled: February 28, 1991Date of Patent: July 27, 1993Assignee: Mannesmann Rexroth GmbHInventor: Jurgen Schmitz
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Patent number: 5189940Abstract: Vehicles having implements are typically used to perform repetitive functions in work cycles. An implement control system raises and lowers an implement relative to the vehicle and reduces the stresses applied to the vehicle from abruptly stopping the motion of the implement. A lever pilot signal is produced in response to the pivotal position of a control lever. An electrohydraulic pilot signal is also produced. The pilot signal having the greater pressure is directed to a main valve for controlling the position of the implement. The method and apparatus of the instant invention are applicable to a number of vehicles having a hydraulically operated implement.Type: GrantFiled: September 13, 1991Date of Patent: March 2, 1993Assignee: Caterpillar Inc.Inventors: Javad Hosseini, Eric A. Hutchison, Randall M. Mitchell, Weldon L. Phelps, James E. Schimpf
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Patent number: 4854219Abstract: An optical actuator position demand signal through optic fiber 14 is focused on one side 32 of optical fluidic interface 16. A second optical signal through optic fiber 56 is attentuated 50 in proportion to actuator 38 position and focused on a second side 34 of the interface 16. Amplified fluidic signals 68, 70 drive the actuator until the demand signal 14 and actual signal 58 are in balance.Type: GrantFiled: June 10, 1988Date of Patent: August 8, 1989Assignee: United Technologies CorporationInventors: Bruce D. Hockaday, Kenneth D. Taylor
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Patent number: 4827830Abstract: A towveyor cart for use in hoisting an object and in particular an object having first and second interconnected portions from a first level to a fully raised level. The towveyor cart has control means which include a main control valve for simultaneously raising the jacks to an intermediate position between the lowermost position and the fully raised position and separate jogging valves for controlling each of the jacks separately between the intermediate and raised positions. In this way, both jacks can be simultaneously rapidly raised to the intermediate position and then independently jogged by the jogging valves to the final fully raised position. Horizontal adjusting means are provided so that a combination of horizontal and vertical adjustment for each jack, independent of the other jack, is obtained. Additionally, the towveyor cart is provided with an improved air reservoir which is mounted beneath the work platform of the cart as opposed to the conventional location which is on the platform.Type: GrantFiled: March 31, 1988Date of Patent: May 9, 1989Assignee: American Hydrostatics Manufacturing Inc.Inventors: Joseph DelProposto, Donald R. Beleski
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Patent number: 4817498Abstract: In a dynamic characteristic compensating device for an electrical hydraulic servo actuator, a differential pressure detecting piston is displaced in proportion to the difference in pressure between two hydraulic operating chambers provided on opposite sides of the main piston in the actuator, and a speed detector converts the displacement of the differential pressure detecting piston into an electrical signal. The electrical signal is fed back to the control signal input circuit side of an electrical hydraulic servo valve, to control the valve in such a manner that differential pressure variations due to disturbances applied to the actuator are canceled out by the feedback signal.Type: GrantFiled: December 7, 1987Date of Patent: April 4, 1989Assignee: Teijin Seiki Co., Ltd.Inventor: Shigeyuki Takagi
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Patent number: 4646620Abstract: An automatic depth control system is disclosed. The system includes a floating piston hydraulic cylinder in which the floating piston is adjusted as a stop for limiting the travel of the main piston in the cylinder. A depth sensing system is provided to sense the actual depth of a implement tool on which the cylinder is mounted to provide a depth signal indicative of the depth penetration of the tool. A circuit system is provided to receive the depth signal and to control a hydraulic valve system to move the stop piston within the cylinder to adjust the working position of the implement tool. The control system includes an instrument panel having a first display indicating the actual depth of the implement tool and a second display indicating the depth limit settings predetermined by the operator. Further means are provided to monitor the actual depth and compare it to the selected depth setting and thereby correct the position of the floating piston.Type: GrantFiled: July 1, 1983Date of Patent: March 3, 1987Inventor: Andrew F. Buchl
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Patent number: 4596177Abstract: A hydraulic fluid powered actuation system preferably for controlling the position of a control surface of an aircraft in response to a plurality of redundant control signals is disclosed. The system comprises an actuator adapted to be mounted in the aircraft, comprising a housing having first and second cylinders with a piston moveably mounted within each of the cylinders. A piston rod connects the pistons and is adapted to engage the control surface. Two rotary torque motors having a common drive shaft are provided which are adapted to receive the plurality of redundant controls signals. First and second rotary control valves, coupled to the drive shaft, and thus, adapted to be driven by the rotary torque motors, are used to control the emission and exhaust of hydraulic fluid from the first and second cylinders, respectively. Preferably, there are four control signals and the torque motors are DC, multiple-poled torque motors with each coil on each torque motor coupled to a different control signal.Type: GrantFiled: November 12, 1982Date of Patent: June 24, 1986Assignee: Rockwell International CorporationInventor: Louis P. Biafore
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Patent number: 4557178Abstract: A servo amplification system is created particularly for heavy construction equipment, but has a general utility that is much broader. The system utilizes a hydraulic analog system with a separate subsystem for each dimension of motion. The operator moves the operative element, such as the backhoe bucket, of the analog replica which ordinarily would be situated in the cab of the backhoe or other piece of equipment. A small hydraulic cylinder operative in response to movement at each articulated connection of the backhoe operates a pilot valve which controls a pilot piston mechanically linked to the drive valve of the drive cylinder of the corresponding articulation in the actual backhoe. A feedback system comprising a mechanical link from the actual drive piston to a feedback cylinder and piston delivers hydraulic fluid back to the inlets of the pilot valve in such a way as to cancel the pilot orders from the initial control cylinder.Type: GrantFiled: July 18, 1983Date of Patent: December 10, 1985Assignee: Clipp ControlInventors: Clarence F. Batchelder, Charles E. Thomas, Kent B. Casady
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Patent number: 4505351Abstract: An automatic braking system for a vehicle including an automatic command system giving a command including at least one braking signal of a level in response to the need for braking, a fluid pressure source, a braking device having an input member which is manually actuatable, and a device for actuating the input member by applying thereto a fluid pressure from the pressure source in response to the level of the braking signal.An automatic braking may thus be performed while permitting manual braking to be simultaneously effected.Type: GrantFiled: November 2, 1981Date of Patent: March 19, 1985Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Masao Nishikawa, Takashi Aoki
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Patent number: 4375942Abstract: Disclosed is a pump comprising a rotatable barrel, a tiltable pump cam, and a proportional servo actuator operatively connected to the pump cam to affect the angle between the pump cam and the axis of the barrel.Type: GrantFiled: April 21, 1981Date of Patent: March 8, 1983Assignee: Dynes/Rivett Inc.Inventor: John R. Olson
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Patent number: 4133250Abstract: A combined feedback control system for a servo actuator including a ram that produces a mechanical displacement output of the system as directed by a position command signal. In the combined feedback control system a lever arrangement mechanically combines displacement and velocity information of the ram, and such combined information is conveniently transduced and electrically combined with the position command signal to develop an error signal that controls an electro-hydraulic valve. The latter preferably through a fluid amplification stage controls the delivery of fluid to the ram and, thus, the position thereof. Through the lever arrangement a mechanical failure control is operative to move the ram to a predetermined position upon failure of the electro-hydraulic valve and a manual control is operable to control the ram position via the fluid amplification stage.Type: GrantFiled: June 22, 1977Date of Patent: January 9, 1979Assignee: Pneumo CorporationInventor: Richard P. Heintz
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Patent number: 4019838Abstract: A two-stage pump which includes a pair of reciprocating pump members operating in opposed pump chambers and a connecting rod connecting the pump members to cause the pump members to operate in unison. Air under pressure is supplied to the chambers by a spool valve member which operates in a guide sleeve. The spool valve includes four outwardly extending portions defining a central pressure slot and a pair of exhaust slots. Ports in the sleeve communicate with the pump chambers. The spool valve is moved by pressure in pressure chambers at opposite ends of the sleeve member. The sleeve is mounted in a bore, and metering air passageways are formed between the valve sleeve and the bore and connecting the pressure chambers with the exhaust slots.Type: GrantFiled: September 3, 1975Date of Patent: April 26, 1977Inventor: Henry T. Fluck
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Patent number: 3945299Abstract: A positioning apparatus includes a master hydraulic positioning cylinder having a relatively long stroke capability and a train of additively connected, short-stroke pneumatic control cylinders for controlling the length of stroke of the master cylinder and thus the positioning of a variable-position tool such as a band saw. One end of the cylinder train is connected by a feedback rod to an extensible portion of the master cylinder. A connecting rod connects the opposite end of the train directly to the spool of a three-position servo valve which controls the flow of hydraulic fluid to and from opposite sides of the master cylinder. When air pressure is admitted to a selected side of a selected control cylinder, at least a portion of the train shifts initially in a direction to move the servo valve to an operating position to begin stroking the master cylinder in a desired direction.Type: GrantFiled: June 24, 1974Date of Patent: March 23, 1976Assignee: Albany International Industries, Inc.Inventors: Rene E. Fritz, Ted C. Foster