Plural Structurally Related Master Pistons, Cylinders Or Pulsator Circuits Patents (Class 60/581)
  • Patent number: 10814850
    Abstract: This invention relates to a hydraulic brake device with a time difference, which utilizes an innovative brake structure to realize the time difference braking technique in which the rear wheel preferentially activates the braking action, to prevent the vehicles from slipping or spillover. Moreover, said time difference hydraulic brake device in the present invention can increase the braking force of the front wheel brake, this allows bicycles, motorcycles, electric scooters, automobiles and other vehicles to effectively improve braking performance and safety.
    Type: Grant
    Filed: May 4, 2016
    Date of Patent: October 27, 2020
    Assignee: GINDA NEW-TECH CO., LTD.
    Inventor: Jui-Lung Chang
  • Patent number: 10625813
    Abstract: A brake assembly has a lever configured to press a knee against a pushrod of a piston of a master cylinder assembly. The knee is configured to receive removable inserts that allow a user to modify the angle at which the lever activates the master cylinder assembly. The master cylinder assembly can include protrusions on the outer surface of the cylinder to protect the cylinder from impact damage.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: April 21, 2020
    Inventor: Robert L. Barnett
  • Patent number: 10584587
    Abstract: An internal combustion engine utilizes the four-cycle process. Gas working chambers are formed using portions of a toroid, two opposing pistons, and seals at the inner gap. A cycle occur over 360 degrees of the toroid with gas ports appropriately placed. One Power Vane (PV) and one Reaction Vane (RV) connect to a central shaft with one piston assembly attached to each end of each vane. The PV produces driving torque on a central shaft through an Overrunning Clutch System (OCS). At specific angles and for controlled durations the PV and RV are slowed, stopped, held to the housing, and then accelerated and coupled to the shaft. Vane movement is controlled by gears, cam ramps, and pin mechanisms operated via multiple, independent but time-coordinated systems. The power vane has no controlled acceleration as combustion forces couple this vane to the shaft via the OCS.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: March 10, 2020
    Inventor: Hugh McLean
  • Patent number: 10434999
    Abstract: A stroke-controlled balancing device for hydraulic braking systems, comprising a balancing duct, a normally closed balancing valve, configured, in use, to maintain a connection between the hydraulic braking system and the balancing duct either closed or open, a stem having an external surface and an internal surface. A balancing channel is provided on the internal surface of the stem, said channel being hydraulically connected to the balancing duct, and the balancing valve is configured to slide, in use, along the external surface of the stem in order to open the connection between the braking system and the balancing duct. A braking system comprising the balancing device, as well as a method of operation of the braking system, are also described.
    Type: Grant
    Filed: July 20, 2016
    Date of Patent: October 8, 2019
    Assignee: VHIT S.p.A. Società Unipersonale
    Inventor: Leonardo Cadeddu
  • Patent number: 9498574
    Abstract: Described herein are medical fluid infusion systems for pumping a fluid to a patient, such as in a hospital environment. In one aspect, disclosed is an infusion system including a drive assembly having a drive fluid reservoir and a drive mechanism configured to apply a force to drive fluid from the drive fluid reservoir through a length of tubing. The infusion system includes a hydraulic assembly having a first fluid chamber having an inlet port configured to be in fluid communication with the length of tubing and a second fluid chamber having an outlet port configured to be in fluid communication with a patient extension set and a flexible movable divider sealing the first fluid chamber from the second fluid chamber. Related apparatus, systems, techniques and articles are also described.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 22, 2016
    Assignee: CareFusion 303, Inc.
    Inventors: Lisa Davis, Robert Butterfield
  • Patent number: 9494172
    Abstract: A vehicle brake device is provided with a master cylinder, a master piston slidably arranged in the master cylinder, an input piston slidably arranged in the master cylinder to be separated from the master piston and defining a separation chamber, an input piston moving amount detecting section for detecting the moving amount of the input piston, a master piston moving amount calculating section for calculating the moving amount of the master piston based on the moving amount of the input piston, and a contact inferring section for inferring the contact of the input piston with the master piston based on the moving amount of the input piston and the moving amount of the master piston.
    Type: Grant
    Filed: March 25, 2013
    Date of Patent: November 15, 2016
    Assignee: ADVICS CO., LTD.
    Inventors: Masaki Maruyama, Yoshio Masuda, Akitaka Nishio, Kiyoyuki Uchida, Masaaki Komazawa, Akira Sakai, Yasuji Mizutani, Yusuke Kamiya
  • Patent number: 9216758
    Abstract: A brake and steering arrangement on a tractor comprising a substantially vertically extending structural support column for connection at a lower end to a floor of a tractor cab and carrying means to support a steering wheel at its upper end. A single cylinder is supported within the column. A first braking circuit operates left and right rear brakes and a second braking circuit operates a cardan brake, characterized in that braking circuits are connected to a single cylinder mounted on the steering column in the tractor cab and wherein said steering column comprises a valve unit, so that the brakes are operable by two pedals.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: December 22, 2015
    Assignee: AGCO International GmbH
    Inventors: Herbert Kerler, Klaus Brugger
  • Patent number: 9108675
    Abstract: A work vehicle is disclosed with a propulsion system that is selectively operable in a first, turning mode or a second, straight mode. The vehicle includes a first traction device, a second traction device, a first steering input, and a second steering input. In the first, turning mode, an operator is able to steer the vehicle left, right, or straight by independently operating the first and second traction devices via the first and second steering inputs. In the second, straight mode, the operator is able to steer the vehicle straight by operating both the first and second fraction devices together via one of the first and second steering inputs.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: August 18, 2015
    Assignee: Deere & Company
    Inventors: Michael J. Boyle, Justin R. Shook, Mark K. Wall, Jeffrey A. Friebel
  • Patent number: 9096288
    Abstract: A dual hydraulic controller apparatus comprises a housing, a first master cylinder disposed at the housing, and a second master cylinder disposed at the housing and coupled to the first master cylinder. The first master cylinder includes a first hydraulic chamber and a first piston disposed in the first hydraulic chamber for reciprocal movement therein. The second master cylinder includes a second hydraulic chamber and a second piston disposed in the second hydraulic chamber for reciprocal movement therein. A first operating member is coupled to the first piston for reciprocating the first piston, and a second operating member is coupled to the second piston for reciprocating the second piston.
    Type: Grant
    Filed: January 5, 2012
    Date of Patent: August 4, 2015
    Assignee: Shimano, Inc.
    Inventors: Daisuke Nago, Shinya Hirotomi, Masahiro Nakakura
  • Patent number: 9051714
    Abstract: A hydraulic system is disclosed. The hydraulic system may have a pump, a first actuator, and a meterless circuit connecting the first actuator to the pump. The hydraulic system may also have a second actuator connected to the meterless circuit in parallel with the first actuator. The second actuator may be a variable-area linear actuator.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: June 9, 2015
    Assignee: Caterpillar Inc.
    Inventor: Patrick Opdenbosch
  • Patent number: 9016805
    Abstract: A vehicle brake system includes a brake pedal unit (BPU) coupled to a vehicle brake pedal and including an input piston connected to operate a pedal simulator during a normal braking mode, and coupled to actuate a pair of output pistons during a manual push through mode. The output pistons are operable to generate brake actuating pressure at first and second outputs of the BPU. A hydraulic pressure source for supplying fluid at a controlled boost pressure is included. The system further includes a hydraulic control unit (HCU) adapted to be hydraulically connected to the BPU and the hydraulic pressure source, the HCU including a slip control valve arrangement, and a switching base brake valve arrangement for switching the brake system between the normal braking mode wherein boost pressure from the pressure source is supplied to first and second vehicle brakes, and the manual push through mode wherein brake actuating pressure from the BPU is supplied to the first and second vehicle brakes.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: April 28, 2015
    Assignee: Kelsey-Hayes Company
    Inventor: Blaise J. Ganzel
  • Publication number: 20150075158
    Abstract: A hand-operated piston pump includes a drive shaft and a rotor mounted in a housing case, the rotor having axial compression chambers, a piston biased by an elastic member sliding in each compression chamber and having a projecting end that engages a cam track; a fluid reservoir in the housing case; a valve plate downstream of the rotor having conduits for a pressurized fluid that communicate with conduits in walls of the compression chambers, the valve plate being non-rotatably mounted below the housing case and communicating with conduits that carry the pressurized fluid to and from a consuming unit through an interposed check valve inserted in a corresponding valve body, the valve body having an upper flange with fluid supply and return channels communicating with the fluid conduits of the valve plate. The valve plate floats relative to the upper flange and is separated therefrom by a separating member.
    Type: Application
    Filed: September 12, 2014
    Publication date: March 19, 2015
    Applicant: ULTRAFLEX S.P.A.
    Inventors: Marcella Gai, Enrico Pagani, Andrea Milanese
  • Patent number: 8978377
    Abstract: A cylinder device is characterized in: that it selectively realizes an operation-force dependent pressurizing state where brake fluid is pressurized by operation force and a high-pressure-source-pressure dependent pressurizing state where brake fluid is pressurized depending on a pressure from a high-pressure-source device; that there are defined an inter-piston chamber in front of an input piston by an insertion of the input piston into a pressurizing piston, an input chamber in the back of a flange of the pressurizing piston at the pressure from the high pressure source device, and an opposing chamber in front of the flange; and that the cylinder device has a mechanism elastically pressurizing an reaction force chamber formed by a communication between the inter-piston and the opposing chambers, and a mechanism switching communication/not-communication state between the reaction chamber and a reservoir.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: March 17, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Hiroshi Isono
  • Patent number: 8973360
    Abstract: A pressure cylinder includes a pressure-boosting member set, an actuation member set, and a cylinder body, which defines two transversely extending air inlets, two transversely extending air outlets and two air passages respectively axially connected between the two air inlets and the two air outlets for allowing an applied compressed gas to flow through the two air inlets and the two air passages and the two air outlets into an air chamber in the cylinder body to move the pressure-boosting member set and the actuation member set in an oil accumulation chamber in the cylinder body. The hidden loop design for guiding the applied compressed gas does not require any extra pipelines and connectors, avoiding pipeline deterioration or connector loosening problems.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: March 10, 2015
    Assignee: Chanto Air Hydraulics Co., Ltd.
    Inventor: Tsai-Chao Wu
  • Publication number: 20140325973
    Abstract: A primary piston assembly for a master brake cylinder of a braking system of a vehicle, including a first primary piston component having a first piston element to which a driver braking force is transmittable in such a way that a pressure chamber volume of a pressure chamber of a master brake cylinder of the braking system which is fillable with liquid is reducible by moving the first piston element with the aid of the driver braking force, and a second primary piston component having a second piston element to which the first braking assisting force is transmittable in such a way that the pressure chamber volume of the pressure chamber is reducible by moving the second piston element with the aid of the first braking assisting force.
    Type: Application
    Filed: August 7, 2012
    Publication date: November 6, 2014
    Applicant: ROBERT BOSCH GmbH
    Inventors: Jochen Mayer, Frank Overzier
  • Patent number: 8733512
    Abstract: Disclosed is an electric disc brake capable of reducing noise and vibration while expanding the life span of the product. The electric disc brake includes a caliper housing to press friction pads provided at both sides of a disc against the disc, a cylinder installed in the caliper housing, a piston moving back and forth in the cylinder to press the friction pads, a driving device generating driving force with respect to the piston, and a volume compensation part communicated with the cylinder to compensate for an increment of a volume of the cylinder according to movement of the piston.
    Type: Grant
    Filed: May 12, 2011
    Date of Patent: May 27, 2014
    Assignee: Mando Corporation
    Inventor: Jin Seok Kim
  • Patent number: 8550116
    Abstract: A twin power valve assembly (10) for a hydraulic braking system having a single body (16) with twin power valve arrangements, each having a spool (36, 36?) with a longitudinally extending passageway (36D, 36D?) for providing a modulation of the pressure applied to the brakes, and an integral balance piston (60, 60?) contained within the body (10) that equalizes the pressure applied to the left and right hand brakes when both brakes are applied.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: October 8, 2013
    Assignee: Carlisle Brake Products (UK) Ltd.
    Inventor: Mark Batchelor
  • Publication number: 20130255479
    Abstract: A compressed air single-action actuator includes an actuator body, a solenoid valve is provided in the actuator body, a solenoid valve plate is provided between the actuator body and the solenoid valve, a gas chamber is provided on the side face of the actuator body, an O-ring seal is provided between the gas chamber and the actuator body; a first inlet passage communicated with the gas chamber is provided on the actuator body, a check valve is provided at one end of the gas chamber of the first gas inlet passage, the other end of the outlet is provided at a right back side of the Namur interface; a second gas inlet passage is provided on the actuator body communicated with the gas chamber, the outlet of the second gas inlet passage is provided at an upper left side of the Namur interface.
    Type: Application
    Filed: May 19, 2011
    Publication date: October 3, 2013
    Inventors: Chunxiu Liu, Yanke Guan, Guihua Li, Baolin Tian
  • Publication number: 20120204553
    Abstract: A method for transforming pressures of a system operating with pressure medium to optimize the travel speeds and/or forces of tasks utilizing pressure, area and flow ratios, employing valve structures, in which method, transforming with pressure transformers the pressure of the actuators differ from system pressure. A device implementing the method includes valve structures and pressure transformers. In the method, pressure transformers are switched when going above or below a set limit value controlling valves of actuators which requires the transformation of travel speed or force. In the device, pressure transformers are arranged to be switched when going above or below a set limit value controlling the valves for the actuator which requires higher travel speed or force.
    Type: Application
    Filed: October 20, 2010
    Publication date: August 16, 2012
    Inventor: Mikko Junttila
  • Publication number: 20120011844
    Abstract: An in-line brake system with a hydraulic booster includes a master cylinder defining a cylinder bore, a master cylinder piston located within the cylinder bore, a transfer piston located within the cylinder bore rearwardly of the master cylinder piston, a transfer piston actuator with a first seat, a sealing member aligned with the first seat, a sealing member spring operably connected to the sealing member and the transfer piston, an input rod aligned with the first seat, a return spring operably connected to the input rod and the transfer piston actuator, a sleeve actuator located within the cylinder bore rearwardly of the master cylinder, and a sleeve spring configured to bias the sleeve actuator away from the master cylinder piston, wherein the sleeve actuator is configured to bias the transfer piston toward the master cylinder piston in response to an applied boost pressure.
    Type: Application
    Filed: July 15, 2010
    Publication date: January 19, 2012
    Applicants: ROBERT BOSCH GMBH, ROBERT BOSCH LLC
    Inventors: Timothy J. Albert, Gregory P. Goodzey, Kevin K. Johnson
  • Publication number: 20120006017
    Abstract: A fast-fill braking system in one embodiment includes a master cylinder, a first chamber within the master cylinder, a second chamber within the master cylinder located forward of the first chamber, a fast-fill piston within the first chamber, a primary piston within the first chamber and movable with respect to the fast-fill piston, and a secondary piston within the second chamber.
    Type: Application
    Filed: July 8, 2010
    Publication date: January 12, 2012
    Applicants: Robert Bosch GmbH, Robert Bosch LLC
    Inventors: Milan Klimes, Timothy J. Albert
  • Patent number: 8091356
    Abstract: In a vehicular brake system, an input piston and a pressure piston are coaxially and axially movably supported in a cylinder, and a brake pedal is coupled to the input piston. Pressure chambers formed on the axially opposite sides of the input piston communicate with each other via a communication passage. A control oil pressure can be supplied to a first supply port of the communication passage, and a reaction-force oil pressure can be supplied to a second supply port of a reaction-force chamber of the input piston, while braking oil pressures can be delivered from delivery ports of the respective pressure chambers.
    Type: Grant
    Filed: September 2, 2010
    Date of Patent: January 10, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroshi Isono, Yasuji Mizutani
  • Publication number: 20110138803
    Abstract: A system of transferring energy and a method of use thereof, wherein the system and method utilize an energy source, a motor and a plurality of hydraulic networks of varying lengths to transfer energy to an energy output device, and wherein the energy transferred to the energy output device is selectively transferred to an external load, and wherein electromechanical interference is obviated. The system further provides for differing sizes of input hydraulic and output hydraulic networks to facilitate conformance to size constraints.
    Type: Application
    Filed: February 3, 2011
    Publication date: June 16, 2011
    Inventor: Ed Gilbert, JR.
  • Patent number: 7861523
    Abstract: In a vehicular brake system, an input piston and a pressure piston are coaxially and axially movably supported in a cylinder, and a brake pedal is coupled to the input piston. Pressure chambers formed on the axially opposite sides of the input piston communicate with each other via a communication passage. A control oil pressure can be supplied to a first supply port of the communication passage, and a reaction-force oil pressure can be supplied to a second supply port of a reaction-force chamber of the input piston, while braking oil pressures can be delivered from delivery ports of the respective pressure chambers.
    Type: Grant
    Filed: July 26, 2006
    Date of Patent: January 4, 2011
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroshi Isono, Yasuji Mizutani
  • Patent number: 7739871
    Abstract: A hydraulically-operated press-driven tool actuation system includes a press-driven hydraulic power device and/or a hydraulically-powered tool actuator. In the tool actuator, at least two pistons are carried by a housing, and at least one return device is carried by the housing laterally inboard of the pistons. In the power device, a pump includes a piston disposed in a pump cylinder for pressurizing hydraulic fluid therein. An accumulator is in fluid communication with the pump cylinder, and includes a piston disposed in an accumulator cylinder that houses hydraulic fluid on one side of the piston. A body supports the pump and accumulator thereon and is in fluid communication between the pump and accumulator cylinders. The body includes a pressure relief valve downstream of the pump cylinder and upstream of the accumulator cylinder, and a check valve downstream of the accumulator cylinder and upstream of the pump cylinder.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: June 22, 2010
    Assignee: DADCO, Inc.
    Inventors: Jonathan P. Cotter, Jeremy M. Kluck, Jason L. Vandine
  • Publication number: 20100089053
    Abstract: A hybrid actuation system includes one or more electromechanical actuators, one or more master hydraulic actuators, and a slave hydraulic actuator. Each electromechanical actuator is adapted to be controllably energized and is configured, upon being controllably energized, to supply a drive force. Each master hydraulic actuator is coupled to receive the drive force from an electromechanical actuator and is configured, upon receipt of the drive force, to at least selectively supply pressurized hydraulic fluid. The slave hydraulic actuator is in fluid communication with the master hydraulic actuator to receive pressurized hydraulic fluid therefrom. The slave hydraulic actuator is responsive to pressurized hydraulic fluid supplied from the master hydraulic actuator to move to a control position.
    Type: Application
    Filed: October 13, 2008
    Publication date: April 15, 2010
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventors: Casey Hanlon, Dean Wilkens
  • Publication number: 20100071362
    Abstract: A pressure system having at least two pressure circuits each including a respective positive-displacement element and each compression side of the positive-displacement elements being in operative communication via a compensation device in such a way that a pressure increase in the first pressure circuit leads to a pressure increase in the second pressure circuit, and the pressure increase of the first pressure circuit is essentially reduced by the amount of the pressure increase of the second pressure circuit, and the reduction in the pressure increase is less than a defined limit value.
    Type: Application
    Filed: October 31, 2005
    Publication date: March 25, 2010
    Inventors: Norbert Alaze, Marcus Egle, Thomas Michl, Horst Beling, Klaus Habr, Heiko Druckenmueller
  • Publication number: 20090249781
    Abstract: Today, the world is faced with many problems such as the Greenhouse Effect, global warming, ozone layer depletion and increased pollution. One direct cause of these problems has been linked to the emission from internal combustion engines. One way to combat these problems is to create a system which utilizes a small internal combustion engine or electrical motor coupled with a hydraulic network. The hydraulic network will exponentially increase output energy without raising the emission levels. In the case where an electrical motor is being used, there is a complete void of pollutants. This motor/hydraulic coupling not only helps save the environment, but provides a cost-effective means of power.
    Type: Application
    Filed: April 2, 2008
    Publication date: October 8, 2009
    Inventor: Ed Gilbert, JR.
  • Publication number: 20090077963
    Abstract: A master cylinder includes a housing and a first secondary piston disposed in the housing. The first secondary piston cooperates with the housing to define a first secondary chamber which changes volume as the first secondary piston moves in the housing. A second secondary piston is disposed in the housing and cooperates with the housing to define a second secondary chamber which changes volume as the second secondary piston moves in the housing. A stepped primary piston is disposed in the housing. The primary piston cooperates with the housing to define a primary chamber which changes volume as the primary piston moves in the housing. The primary piston defines an abutment surface which can be driven into abutment with the first secondary piston and the second secondary piston to move the first secondary piston and the second secondary piston. A primary piston spring maintains a restorative force on the primary piston when actuated.
    Type: Application
    Filed: June 29, 2006
    Publication date: March 26, 2009
    Inventor: Blaise Ganzel
  • Publication number: 20080229741
    Abstract: In a vehicular brake system, an input piston and a pressure piston are coaxially and axially movably supported in a cylinder, and a brake pedal is coupled to the input piston. Pressure chambers formed on the axially opposite sides of the input piston communicate with each other via a communication passage. A control oil pressure can be supplied to a first supply port of the communication passage, and a reaction-force oil pressure can be supplied to a second supply port of a reaction-force chamber of the input piston, while braking oil pressures can be delivered from delivery ports of the respective pressure chambers.
    Type: Application
    Filed: July 26, 2006
    Publication date: September 25, 2008
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroshi Isono, Yasuji Mizutani
  • Publication number: 20080143054
    Abstract: A brake apply master cylinder includes a body and a piston assembly. The body includes a bore. The bore has a longitudinal axis, a closed front end, a primary fluid outlet fluidly connectable to a primary brake circuit, and a secondary fluid outlet fluidly connectable to a secondary brake circuit. The piston assembly includes a single brake apply piston positioned in the bore. The piston assembly fluidly divides the bore into a primary fluid chamber in fluid communication with the primary fluid outlet and a secondary fluid chamber in fluid communication with the secondary fluid outlet. Another brake apply master cylinder includes a body, a piston assembly, and a return spring assembly. The return spring assembly is positioned in the bore of the body and extends from the closed front end of the bore to a return-spring seat of a single brake apply piston of the piston assembly.
    Type: Application
    Filed: December 19, 2006
    Publication date: June 19, 2008
    Inventors: James W. Zehnder, Michael W. Hurtt, Chris C. Carter
  • Patent number: 7194859
    Abstract: An intensifier is operable to supply force and includes a housing defining a cavity. A ram is slidably positioned within the cavity and partially extends from the housing. The intensifier also includes a force transfer rod and a plurality of power pistons. The ram is moveable between retracted and extended positions along a longitudinal axis. The force transfer rod is selectively moveable between a retracted position where the force transfer rod is not axially aligned with the ram and an advanced position where the force transfer rod is axially aligned with the ram. The plurality of power pistons are axially aligned with each other and the ram. The power pistons are selectively operable to provide an output force to the ram when the force transfer rod is in the advanced position.
    Type: Grant
    Filed: October 18, 2005
    Date of Patent: March 27, 2007
    Assignee: BTM Corporation
    Inventors: Edwin G. Sawdon, Steven J. Sprotberry, Brian D. Petit
  • Patent number: 6929104
    Abstract: A dual circuit pilot master cylinder for a full power brake system provides a minimally sized package for installation in a vehicle cab interior. The master cylinder utilizes a side-by-side disposition of the primary and secondary cylinders and a brake pedal linkage to the pistons allowing flexibility in location of the device.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: August 16, 2005
    Assignee: International Truck Intellectual Property Company, LLC
    Inventor: James A. Thomas
  • Patent number: 6895749
    Abstract: A double-acting pressure intensifying cylinder and method, wherein a first cylinder a second cylinder are connected via an operation chamber in series. The first fluid chamber is provided with a first piston and the second fluid chamber is provided with a second piston. In an operation chamber, a rod is slidably inserted. The first fluid chamber has a first fluid supply port and an air port, the second fluid chamber has a third fluid supply port and a fourth fluid supply port, the operation chamber has a second fluid supply port. A check valve is provided wherein the series connected first and second cylinders at a position closer to the second cylinder than to the second fluid supply port in the operation chamber and makes it possible for a fluid such as a hydraulic fluid to flow only in one direction from the operation chamber to the second cylinder.
    Type: Grant
    Filed: March 12, 2003
    Date of Patent: May 24, 2005
    Assignee: Yugenkaisha Honda Seisakusho
    Inventor: Honda Tohru
  • Patent number: 6851355
    Abstract: The pressing method includes the first step of displacing a sub-piston provided within a sub-cylinder from its initial position to press working fluid such that the working fluid is introduced via a check valve into a main cylinder to displace a main piston provided therein, and the second step of causing the sub-piston to return to the initial position such that the working fluid is supplied to the sub-cylinder. The first and second steps are repeated successively until the working fluid in the main cylinder attains a prescribed pressure level. With this method, variation in the way of pressing an object is alleviated, contamination due to the working fluid is prevented, and downsizing of the pressing mechanism is enabled.
    Type: Grant
    Filed: August 13, 2001
    Date of Patent: February 8, 2005
    Assignee: Towa Corporation
    Inventors: Akiyuki Harada, Masataka Takehara
  • Patent number: 6789389
    Abstract: A piston-cylinder mechanism includes a cylinder (50) that defines a cylindrical bore (51). Two pistons (52, 53) are disposed within the cylindrical bore, so that a first pressure chamber (57), a second pressure chamber (58) and a third pressure chamber (59) are defined within the cylindrical bore. The first pressure chamber and one of the second and third pressure chambers individually receive a supply of a pressurized fluid. The pressurized fluid is delivered individually from the second pressure chamber and the third pressure chamber to respective external devices (16, 17). A valve (60; 160) is arranged between one of the second pressure chamber and the third pressure chamber and the corresponding external device. The valve is operable to open and close when the one of the second pressure chamber and the third pressure chamber is expanded and contracted, respectively, due to the movement of the pistons.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: September 14, 2004
    Assignee: Advics Co., Ltd.
    Inventor: Keita Nakano
  • Patent number: 6729132
    Abstract: A bi-directional braking assembly for a vehicle includes a hydraulic booster assembly for applying proportional fluid pressure to a brake assembly and is actuated by a forward pedal. A master cylinder actuated by a rear pedal communicates fluid to the hydraulic booster assembly through a hydraulic booster valve. The hydraulic booster valve includes a piston movable to regulate hydraulic pressure in response to actuation of first and second plungers. The second plunger is movable along an axis separate from the first plunger in response to actuation of a master cylinder by a rear pedal. The master cylinder provides pressure to the booster valve assembly that acts on an area between the first and second plunger assemblies to move the second plunger away from the first plunger to actuate and move the booster piston within the valve.
    Type: Grant
    Filed: July 19, 2002
    Date of Patent: May 4, 2004
    Assignee: Meritor Heavy Vehicle Braking Systems (UK) Ltd
    Inventors: Mark Batchelor, Michael Williamson
  • Patent number: 6705682
    Abstract: A vehicle hydraulic brake apparatus includes a hydraulic pressure generator which generates a power pressure irrespective of operation of a brake pedal and a regulation valve which regulates the power pressure to a predetermined pressure corresponding to an operation force of the brake pedal and outputs it to an output chamber. A master cylinder generates a master cylinder pressure in a master cylinder chamber by forward movement of the master cylinder piston and a wheel brake cylinder is operated by the master cylinder pressure to apply braking force to a vehicle wheel. An auxiliary piston is located backward the master cylinder piston to define an auxiliary pressure chamber between the master cylinder piston and the auxiliary piston and to move the master cylinder piston forward by an auxiliary pressure in the auxiliary pressure chamber. A pressure modulating device decreases the predetermined pressure outputted from the output chamber to supply the auxiliary pressure to the auxiliary pressure chamber.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: March 16, 2004
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Akihito Kusano, Satoshi Ishida
  • Publication number: 20040011614
    Abstract: The present invention relates to a tandem master cylinder (20) including two plunger pistons (2, 4) and its object is to design the cylinder as simple as possible and to render its assembly as economical as possible. This object is achieved by inserting circumferential annular grooves (16 to 19) directly into the housing (15) of the master cylinder (20) in order to accommodate sealing sleeves, namely both the primary seal (6) and, in an improvement of the invention, the primary seal (7) of the piston at the end of the push rod as well as the secondary seals (12, 14) of both pistons (1, 3). Collecting annular grooves (45, 46) at the level of the connecting outlets for the compensating reservoir (5, 10) are further favorable aspects of the invention.
    Type: Application
    Filed: March 28, 2003
    Publication date: January 22, 2004
    Inventor: Hans-Jorg Feigel
  • Patent number: 6609370
    Abstract: A dual hydraulic booster assembly for a braking system of a tractor or like vehicle has a logic valve operable in a first mode to control the supply of pressure fluid for braking on one side of the vehicle to facilitate steering, and in a second mode of operation to control the supply of fluid pressure for braking on both sides of the vehicle for full vehicle retardation. A pressure amplifier valve may be provided to increase the pressure of the pressure fluid from the logic valve for braking in the second mode of operation. The logic valve and amplifier valve may be incorporated into the booster assembly to provide an integrated unit.
    Type: Grant
    Filed: January 4, 2001
    Date of Patent: August 26, 2003
    Assignee: ArvinMeritor, Inc.
    Inventor: Mark Batchelor
  • Patent number: 6502396
    Abstract: A two-stage brake valve, has a pair of stages with different effective areas which become effective in succession upon an actuation of the valve, including a larger area fill chamber and a smaller area pressure chamber. A fill stage pressure relief valve is connected between the fill chamber and a reservoir. The relief valve includes a valve element, which is exposed to the pressure in the reservoir and spring force, and which is exposed to pressure in the fill chamber, so that it opens upon a pre-set brake pressure existing in the fill chamber. The relief valve also includes a pressure relief piston which can be exposed to the pressure in the fill chamber, and which can be exposed to the pressure in the pressure chamber. The piston has a free end which engages the valve element, and forces the valve element in its opening direction with increasing pressure difference between the pressure chamber and the fill chamber.
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: January 7, 2003
    Assignee: Deere & Company
    Inventor: Manfred Becker
  • Patent number: 6270323
    Abstract: A hydraulic power conversion device includes a main oil container, a pair of hydraulic pumps, a motor, a twin-circuitry hydraulic cylinder mechanism including a first hydraulic cylinder, a first piston, a piston rod, a sealer, a second piston, a high pressure leakage proof packing and a second hydraulic cylinder, the first hydraulic cylinder having same length as the second hydraulic cylinder but having a smaller diameter than the second hydraulic cylinder, the first hydraulic cylinder being connected with the second hydraulic cylinder by screws, the sealer being fitted between the first and second hydraulic cylinders to form two regions, the second hydraulic cylinder having an inlet provided with a first check valve and an outlet provided with a second check valve, an oil retrieving container connected with the inlet of the second hydraulic cylinder, and a hydraulic pressure storage trough.
    Type: Grant
    Filed: October 22, 1999
    Date of Patent: August 7, 2001
    Inventor: Tien-Lung Hsu
  • Patent number: 6079209
    Abstract: A hydraulic power conversion device includes a main oil container having an inlet for supplementing hydraulic oil, a pair of hydraulic pumps connected to the main oil container, a motor drivingly connected with the hydraulic pumps, a twin-circuitry hydraulic cylinder mechanism including a first hydraulic cylinder, a first piston, a piston rod, a sealer, a second piston, a high pressure leakage proof packing and a second hydraulic cylinder, the first hydraulic cylinder having same length as the second hydraulic cylinder but having a smaller diameter than the second hydraulic cylinder, the first hydraulic cylinder being connected with the second hydraulic cylinder by screws, the sealer being fitted between the first and second hydraulic cylinders to form two regions, the second hydraulic cylinder having an inlet provided with a first check valve only allowing hydraulic oil to flow into the second hydraulic cylinder and an outlet provided with a second check valve only allowing hydraulic oil to flow out of the s
    Type: Grant
    Filed: January 13, 1999
    Date of Patent: June 27, 2000
    Inventor: Tien-Lung Hsu
  • Patent number: 6065289
    Abstract: The present invention relates generally to fluid displacement apparatuses and methods. The inventive apparatus comprises: a housing having an interior space; a crankpin positionable in the interior space; and a plurality of articulated displacement members positionable in the interior space such that the articulated displacement members extend from the crankpin and define in the interior space a plurality of displacement zones. The inventive apparatus can be embodied as a pump, a compressor, a fluid flow meter, a stirling-type engine, a relay system, an actuator, and many other devices.
    Type: Grant
    Filed: June 24, 1998
    Date of Patent: May 23, 2000
    Assignee: Quiet Revolution Motor Company, L.L.C.
    Inventor: Darryl H. Phillips
  • Patent number: 6026934
    Abstract: A hydraulic lift system including a master cylinder, a plurality of slave cylinders, a yoke interconnecting the master and slave cylinders, and a plurality of lift cylinders each in fluid communication with one of the slave cylinders. The extension of the master cylinder moves the yoke, which causes the simultaneous coordinated movement of the slave cylinders. Equal volumes of hydraulic fluid are forced out of, or permitted into, each of the slave cylinders and into, or out of, the lift cylinders, thus extending the lift cylinders in simultaneous coordinated movement. When the cylinders are vertically arranged to support, for example, a work surface, the work surface remains level throughout the range of vertical movement.
    Type: Grant
    Filed: June 26, 1998
    Date of Patent: February 22, 2000
    Assignee: Monarch Hydraulics, Inc.
    Inventor: John M. Deurloo
  • Patent number: 5960629
    Abstract: A control apparatus (12) in a brake system (10) has a housing (20) with an inlet port (26), a gear port (32), a relief port (38), and an outlet port (42). A piston (44) located in a first bore (22) has a first peripheral surface (50) with first (52) and second (54) grooves separated by a land (56) and a second bore (60) respectively connected to the first (52) and second (54) grooves by first (62) and second (64) radial passages. A spool (68) which has a peripheral surface (74) with a control groove (76) is connected to a third bore (88) therein by a cross bore or passage (86) and retained in the second bore (60) by a snap ring (96). An input rod (92) which is located in the third bore (88) has a shoulder (94) which engages the spool (68) while an end cap (98) that is connected to the housing (20) retains the piston (44), spool (68) and input rod (92) in the housing (20).
    Type: Grant
    Filed: January 29, 1998
    Date of Patent: October 5, 1999
    Assignee: Robert Bosch Technology Corp
    Inventors: Richard Becker McClain, Kenneth Scott Towers
  • Patent number: 5890364
    Abstract: An improved compensation piston arrangement for use with a dual circuit master cylinder having a single service piston for simultaneously pressurizing a first fluid chamber and a second fluid chamber, wherein the compensation piston arrangement provides for pressure balancing between the first fluid chamber and the second fluid chamber to compensate for minor normal differences between the first and second fluid chamber. The compensation piston arrangement includes a movable compensation piston slidably disposed within a bore of a compensation housing, wherein the housing defines a pair of end stops positioned on opposing sides of the compensation piston. The bore is in fluid communication with the fluid chambers such that the pressure within the first fluid chamber acts on a first side of the compensation piston, and the pressure within the second fluid chamber acts on a second end of the compensation piston which is opposite the first end.
    Type: Grant
    Filed: March 7, 1997
    Date of Patent: April 6, 1999
    Assignee: Kelsey-Hayes Company
    Inventors: Herbert L. Linkner, Jr., Wendell D. Tackett
  • Patent number: 5887432
    Abstract: A brake master cylinder with a plunger piston is acted upon by a brake linkage. A floating piston is arranged between two working spaces and separates the first and the second working space fluidically from one another. Each of the two working spaces opens into a main brake circuit, and the floating piston is axially movable in the brake master cylinder. A sleeve is axially movable in the brake master cylinder and is provided at least between the floating piston and the wall of the brake master cylinder. The sleeve and the wall of the brake master cylinder each have an opening which, in interaction, connect the first working space, formed by the floating piston and the plunger piston, to a displacement passage at least in the case of a movement of the floating piston into a first position in the direction of a brake actuation. With a movement of the floating piston beyond the first position, the sleeve is moved axially and separates the first working space from the displacement passage.
    Type: Grant
    Filed: July 28, 1997
    Date of Patent: March 30, 1999
    Assignee: Daimler-Benz AG
    Inventors: Johannes Clauss, Martina Richerzhagen, Harry Troester
  • Patent number: 5878574
    Abstract: An improved force transfer arrangement for use in a dual circuit master cylinder having a pair of nested concentric pistons for pressurizing a pair of respective fluid chambers, wherein the force transfer arrangement imparts an input force from an input piston on a pair of pistons such that the pair of pistons can move relative to each other to compensate for different travel lengths. The invention discloses three embodiments of the improved force transfer arrangement. A first embodiment includes a hydraulic fluid chamber in fluid communication with the input piston and the pair of pistons. A second embodiment includes a circumferentially arranged ball mechanism positioned between the input piston and the pair of pistons. A third embodiment includes a notched lever ring assembly positioned between the input piston and the pair of pistons.
    Type: Grant
    Filed: March 5, 1997
    Date of Patent: March 9, 1999
    Assignee: Kelsey-Hayes Company
    Inventors: Herbert L. Linkner, Jr., Wendell D. Tackett
  • Patent number: 5857335
    Abstract: A hydraulic pressure amplifier, coupled to a turbine, for creating a fluid impulse directed to a blade of the turbine causing it to rotate. The hydraulic pressure amplifier is comprised of a series of connected sections with each section having a large cylinder and a small cylinder with a large piston and a small piston placed therein. The small piston providing an amplified force applied to the larger surface area of the larger piston through hydraulic coupling to effectively amplify an initial pressure or force. As a result very high forces are generated with relatively small movement. A free piston placed in an impulse cylinder in an end section is struck, causing a fluid impulse. The fluid impulse creates an impulse wave used to move a blade of a turbine, causing a shaft to rotate. An efficient rotational motor is achieved that has many practical applications. Additionally, the hydraulic pressure amplifier may be used in any application where a very high force is desired with relatively little motion.
    Type: Grant
    Filed: September 6, 1996
    Date of Patent: January 12, 1999
    Inventor: Constantin Tomoiu