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US 4,281,585 AGranted
Hydraulic brake booster and valve member
AssigneeThe Bendix Corporation
InventorsDean E. Runkle, Louis S. Tang, Gregory K. Harrison
Life of this patent
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AssigneeThe Bendix Corporation
InventorsDean E. Runkle, Louis S. Tang, Gregory K. Harrison
Estimating the term…
A hydraulic brake booster includes a housing which defines a pressure chamber and a piston within the housing is movable in response to pressurized fluid within the pressure chamber to effectuate a brake application. The piston encloses a storage chamber and forms a passage communicating the storage chamber with the pressure chamber. A valve member is disposed within the passage to control communication between the storage chamber and the pressure chamber. An operator actuator cooperates with a control valve to communicate pressurized fluid to the pressure chamber and a finger is actuated by the operator actuator to engage the valve member, thereby opening communication between the storage chamber and the pressure chamber. The valve member comprises a unitary assembly having a sleeve sealingly engaging the wall of the piston passage, a seat member biased into engagement with a shoulder defined by a stepped bore on the sleeve, and a stem extending through a bore on the seat member.
In a hydraulic brake booster having a housing defining a pressure chamber, a piston mounted in the housing and movable relative to the housing in response to the pressure in the pressure chamber, the piston defining and enclosing a storage chamber and a passage connecting said storage chamber with said pressure chamber, a control valve mounted in the housing, an operator actuator cooperating with the control valve to communicate pressurized fluid to the pressure chamber, and a valve member carried by the piston within said passage and communicating pressurized fluid from the pressure chamber to the storage chamber via said passage, the improvement wherein said valve member is movable relative to said piston to open fluid communication from said storage chamber to said pressure chamber, a finger member carried by the operator actuator and slidably movable on said piston and pivot piston, said finger member being engageable with said valve member to move the latter relative to said piston, said operator actuator cooperating with said finger member to urge said finger member into engagement with said valve member to control the communication of pressurized fluid from the storage chamber to the pressure chamber.
In a hydraulic brake booster having a housing defining a pressure chamber, a control valve mounted in the housing for communicating pressure to the pressure chamber, a piston disposed within the housing and moving relative to the housing in response to pressure communicated to the pressure chamber, the piston defining and enclosing a storage chamber and an operator actuator imparting movement to the piston when the pressure within the pressure chamber is below a predetermined value, the improvement in which a passage through the piston communicates the storage chamber with the pressure chamber and a valve member is disposed in the passage, said valve member comprising a sleeve sealingly engaging the wall of the passage, said sleeve having a stepped bore therethrough defining a shoulder, a seat member resiliently biased into engagement with the shoulder, and a stem extending through a bore in the seat member, said stem normally engaging the seat member to close the seat member bore and said seat member normally engaging the shoulder to close the sleeve stepped bore to normally close communication between the storage chamber and the pressure chamber.
In a hydraulic brake booster having a housing defining a pressure chamber, a movable piston mounted in the housing and defining a storage chamber within the piston, a control valve mounted in the housing, an operator actuator cooperating with the control valve during a brake application to communicate pressurized fluid to the pressure chamber, the piston being movable in response to fluid pressure within the pressure chamber and defining a passage communicating the pressure chamber with the storage chamber, and a valve member carried by the piston within said passage, the improvement in which said valve member includes a sleeve which is movably disposed within said piston passage, said sleeve and said piston defining cooperating abutments opposing movement of said sleeve toward said pressure chamber in response to pressurized fluid in said storage chamber, said sleeve being deformable when the pressure within the storage chamber is above a predetermined value to move said valve member toward said pressure chamber, and said valve member includes a stem which extends toward said pressure chamber and is movable relative to said sleeve to open communication between the pressure chamber and the storage chamber, said stem confronting an abutment-defining member which is carried by and moves with said piston, said stem contacting said abutment-defining member to open communication between the pressure chamber and the storage chamber when said sleeve is deformed and moves said valve member toward said pressure chamber.
In a hydraulic brake booster having a housing defining a pressure chamber, a movable piston mounted in the housing and defining a storage chamber within the piston, a control valve mounted in the housing, an operator actuator cooperating with the control valve to communicate pressurized fluid to the pressure chamber, and a valve member carried by the piston, the improvement in which said valve member comprises a unitary assembly for attachment with said piston, said unitary assembly providing for opening and closing communication between the pressure chamber and the storage chamber in response to a pressure differential across said unitary assembly, said unitary assembly including a sleeve which is disposed in a bore in said piston, a seat member carried by said sleeve and a stem extending through said seat member, said stem and seat member being movable relative to said sleeve when the pressure in the storage chamber is above a predetermined value to communicate the storage chamber with the pressure chamber, said stem being movable relative to said seat member and said sleeve when the pressure in the pressure chamber is greater than that in the storage chamber to communicate the pressure chamber with the storage chamber, and said stem cooperating with said seat member to close communication between the pressure chamber and the storage chamber when the pressure in the storage chamber is above the pressure in the pressure chamber but less than the predetermined value.
In a hydraulic brake booster having a housing defining a pressure chamber, a movable piston mounted in the housing and defining a storage chamber within the piston, a control valve mounted in the housing, an operator actuator cooperating with the control valve to communicate pressurized fluid to the pressure chamber, and a valve member carried by the piston, the improvement in which said valve member comprises a unitary assembly for attachment with said piston, said unitary assembly providing for opening and closing communication between the pressure chamber and the storage chamber in response to a pressure differential across said unitary assembly, said piston including a plug partially forming the storage chamber, said plug having a blind bore substantially disposed in the center of said plug for receiving said operator actuator, said plug having a passage which is radially disposed from and offset from the center of said plug and said valve member is disposed within said passage.
Dependencies are inferred from the claim text.