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| Number | Title | Issue Date |
| 7219495 | Hydraulic cylinder A hydraulic cylinder includes a housing having a fluid connection for connecting to a hydraulic system and an after-running connection for connecting to a fluid after-running vessel, and a piston which is axially displaceable in the housing to define a variable pres... | 05/22/2007 |
| 7107769 | Master cylinder A combined master cylinder and dump valve includes a piston slideable within a body bore that defines a master cylinder for pressurizing a brake port. The piston includes a piston seal for isolating a pressure port from a tank port, a piston bore, a first piston hol... | 09/19/2006 |
| 6955407 | Negative pressure type brake hydraulic pressure generating device A negative pressure type brake hydraulic pressure generating device is proposed in which the stroke on the operating side can be set independently of the stroke on the output side. A slide resistance imparting means is provided between the fixed shell and a piston h... | 10/18/2005 |
| 6226993 | Fully hydraulic brake booster/master cylinder unit A fully hydraulic brake booster/master cylinder unit (10) for a vehicle brake system has a housing (12) and a bore (14) which is formed therein and in which is arranged sealingly and displaceably a primary piston (16) which is coupled to an input member (... | 05/08/2001 |
| 6216457 | Electronically controlled hydraulic brake boost pressure control system A vehicle hydraulic system is disclosed comprising a hydraulic fluid reservoir; a pressure force supplying pressurized hydraulic fluid to a discharge header; a fluid conduit between the discharge header and the reservoir; a back pressure valve operative i... | 04/17/2001 |
| 5960629 | Control apparatus for a brake booster 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 s... | 10/05/1999 |
| 5105623 | Hydraulic booster with noise reducing tubular member disposed in spool The invention is directed to a hydraulic booster for use in a hydraulic braking system of an automotive vehicle having a power source for generating a hydraulic power pressure, a reservoir and a master cylinder for generating a hydraulic braking pressure ... | 04/21/1992 |
| 4625625 | Vehicle hydraulic systems In a vehicle hydraulic system of the open center kind, hydraulic fluid for operating vehicle services is circulated continuously, normally by an engine-driven pump. A closed center booster which requires a substantially constant pressure differential to o... | 12/02/1986 |
| 4539892 | Hydraulic brake booster A hydraulic brake booster comprises a housing forming a pressure chamber and a pair of bores leading to the pressure chamber. One of the bores receives an output piston and the other bore receives a valve member. The valve member is movable by an input ac... | 09/10/1985 |
| 4467700 | Hydraulic boost mechanism A hydraulic power booster in a hydraulic brake system for an automatic vehicle includes a booster housing having inlet and outlet ports respectively connected to a fluid reservoir. A piston is slidably received within the booster housing and is connected ... | 08/28/1984 |
| 4423598 | Working fluid supply system for a hydraulic power booster and a power steering system A working fluid supply system for a hydraulic power booster and a power steering system includes first and second fluid supply pumps, a hydraulic power boosting apparatus, a power steering unit, various fluid passages connecting thereto and a control appa... | 01/03/1984 |
| 4407643 | Power fluid system embodying two-fluid pump A power fluid system for a vehicle embodying a two-fluid pump which utilizes an existing source of fluid under pressure is provided. The existing source of fluid enables a second source of fluid under pressure to be established through the two-fluid pump.... | 10/04/1983 |
| 4387569 | Hydraulic brake booster A hydraulic brake booster which has an input valve control member acting through a controlled rate spring and through a lever pivoted on the booster housing in the power chamber to move a spool valve in a bore parallel to the power piston so that the inpu... | 06/14/1983 |
| 4385547 | Hydraulic brake booster A hydraulic brake booster includes a housing (10) which movably supports a piston (16) and a control valve (20). The housing also substantially defines a pressure chamber (22) for receiving fluid pressure via the control valve (20) to move the piston (16)... | 05/31/1983 |
| 4377105 | Hydraulic brake booster A hydraulic brake booster includes a housing (22) with a control valve assembly (34) and a piston (30). The control valve assembly (34) carries a secondary valve assembly (56) including a pilot member (58) and a mounting ring (60). The secondary valve ass... | 03/22/1983 |
| 4359869 | Hydraulic power boost apparatus A hydraulic power boost apparatus for use with the braking system of an automotive vehicle includes a power piston cooperating with a slide valve to define a plurality of spool valves to regulate the flow of a pressurized fluid therethrough to selectively... | 11/23/1982 |
| 4358991 | Hydraulic booster A hydraulic booster for a brake system or the like, of a vehicle includes a throttle valve which produces hydraulic pressure corresponding to the depression force applied to a brake pedal. Relative axial displacement of an operating rod and a power piston... | 11/16/1982 |
| 4353209 | Hydraulic brake booster A hydraulic brake booster (10) includes a spring-balanced control valve (42) communicating pressurized fluid to a pressure chamber (14) in response to an operator input. The magnitude of the fluid pressure communicated to the pressure chamber (14) is a fu... | 10/12/1982 |
| 4337686 | Hydraulic force multiplying device A hydraulic force multiplying device has a housing having an inlet port connected to a source of hydraulic pressure and an outlet port, an input rod and an output rod, one end of each of the input and output rod being slidably connected with one another w... | 07/06/1982 |
| 4296674 | Quick take-up brake booster A hydraulic brake booster includes a housing substantially defining a pressure chamber and movably supporting a control valve and a piston. An input assembly extends into the pressure chamber and cooperates with the control valve to communicate fluid pres... | 10/27/1981 |
| 4290342 | Hydraulic booster valve The present invention is an improved hydraulic booster which allows transition from a manual braking mode to a power assist braking mode without the control called for in the manual mode immediately applied when the power assist function begins to operate... | 09/22/1981 |
| 4249452 | Hydraulic brake booster reserve system A hydraulic brake booster provides a housing within which a spool valve is slidably mounted. The housing forms a pressure chamber and the spool valve is movable from a first position venting the pressure chamber to a second position, communicating the pre... | 02/10/1981 |
| 4214448 | Hydraulic brake booster There is disclosed a hydraulic brake booster comprising a valve spool providing for alternate connection of a booster chamber with a source of pressure-transmitting fluid and an unpressurized return reservoir. The source of pressure-transmitting fluid is ... | 07/29/1980 |
| 4212166 | Hydraulic brake booster and relief valve therefor A hydraulic brake booster includes a housing which substantially defines a pressure chamber and the housing slidably supports a control valve for communicating pressurized fluid to the pressure chamber. A piston is movably disposed within the housing to m... | 07/15/1980 |
| 4199940 | Dual power brake booster and method of generating brake actuating pressure A vehicle brake booster and master cylinder assembly has a vacuum suspended booster section which is controlled by movement of the vehicle brake pedal. A hydraulic booster section is in series with the vacuum suspended booster section, and a master cylind... | 04/29/1980 |
| 4199946 | Integrated control for brake and steering systems An integrated control mechanism for regulating the communication of pressurized fluid from a source to a brake system and a steering system of a vehicle in response to independent operator brake and steering signals. The integrated control mechanism has a... | 04/29/1980 |
| 4199947 | Dual power brake booster system A vehicle brake booster and master cylinder assembly has a vacuum suspended booster section which is controlled by movement of the vehicle brake pedal. A hydraulic booster section is in series with the vacuum suspended booster section, and a master cylind... | 04/29/1980 |
| 4198823 | Method of generating brake actuating pressure A vehicle brake booster and master cylinder assembly has a vacuum suspended booster section which is controlled by movement of the vehicle brake pedal. A hydraulic booster section is in series with the vacuum suspended booster section, and a master cyclin... | 04/22/1980 |
| 4195484 | Dual power brake booster A vehicle brake booster and master cylinder assembly has a vacuum suspended booster section which is controlled by movement of the vehicle brake pedal. A hydraulic booster section is in series with the vacuum suspended booster section, and a master cylind... | 04/01/1980 |
| 4181371 | Power brake control valve for vehicles A power brake control device for vehicles disposed between a manual brake operating member and wheel brake members which includes an accumulator, a housing including a first inlet port connected to a hydraulic pressure source, a second inlet port connecte... | 01/01/1980 |
| 4141284 | Two stage power valve A power brake valve and a related braking system are disclosed. The valve comprises a housing defining a first bore of large diameter and a second bore of smaller diameter, and annular pistons are slidably disposed within each bore. A biended rod, also sl... | 02/27/1979 |
| 4087972 | Brake booster with spring type ratio changer A motor vehicle fluid power circuit is provided with a constant displacement pump, a control valve, an open center steering valve, and a brake booster with a spring type ratio changer. The brake booster includes an input rod which is connected to a brake ... | 05/09/1978 |
| 4072011 | Hydraulic brake booster A brake booster for use in a braking system having a control valve which is responsive to a hydraulic output force created by manually moving a piston in a bore of a master cylinder. The hydraulic output force actuates the control valve which proportional... | 02/07/1978 |
| 4024713 | Brake booster A dual source power brake booster assembly includes an air-vacuum operated booster section and a hydraulic pressure operated booster section disposed in series. The assembly is so arranged that the vacuum booster section is initially actuated to obtain a ... | 05/24/1977 |
| 4014171 | Hydraulic brake booster A hydraulic brake booster includes a housing having a bore therein, a stepped power piston slidably disposed within the bore and forming at one side thereof a fluid chamber, a first passage communicating with a fluid pressure source, a second passage comm... | 03/29/1977 |
| 3935709 | Dual power brake booster A vehicle brake booster and master cylinder assembly has a vacuum suspended booster section which is controlled by movement of the vehicle brake pedal. A hydraulic booster section is in series with the vacuum suspended booster section, and a master cylind... | 02/03/1976 |
