Servo boosters for vehicle brake systems
AssigneeGirling Limited
InventorsAlfred W. Thomas, Ulrich W. Danne
Life of this patent
Estimating the term…
Abstract
In order to reduce the distortion of a servo booster housing in use the booster is provided with one or more force transmitting means which extend through the movable wall for transmitting reaction forces directly from the master cylinder housing to the vehicle bulkhead between which the booster is mounted. This enables a housing of lighter weight to be employed, and an overall saving in weight may be achieved.
Claims26
In a servo booster assembly for vehicle brake systems comprising a housing having opposed walls, a movable wall positioned between said housing walls and dividing the interior of said housing into two chambers, an output member having an operative connection with said movable wall and operable through one of said housing walls, a control valve assembly having an operative connection with said housing, and an input member for operating said control valve assembly for controlling a supply of differential pressure to opposite sides of said movable wall, the invention comprising stationary force transmitting means extending through said movable wall from one to the other of said housing walls, means sealing said movable wall to said force transmitting means, and means for connecting said housing to a relatively fixed vehicle bulkhead in a position adjacent said force transmitting means with said force transmitting means being located to transmit substantially directly to said bulkhead reaction forces and substantially relieve said housing walls from said forces upon operation of said booster assembly, said housing walls being of a thickness and material which in the absence of said force transmitting means are incapable of accomodating the stresses of said reaction forces without excessive axial deformation.
In a servo booster assembly for vehicle brake systems comprising a housing having opposed walls, a movable wall positioned between said housing walls and dividing the interior of said housing into two chambers, an output member having an operative connection with said movable wall and operable through one of said housing walls, means for controlling a supply of differential pressure to opposite sides of said movable walls comprising a control valve assembly having an operative connection with said housing and an input member for operating said control valve assembly, the invention comprising stationary force transmitting means extending through said movable wall from one to the other of said housing walls, means sealing said movable wall to said force transmitting means, and means for connecting said housing to a relatively fixed vehicle bulkhead in a position wherein said force transmitting means is located in force transmitting relationship with respect to said bulkhead for transmitting substantially directly to said bulkhead reaction forces and substantially relieve said housing walls from said forces upon operation of said booster assembly, said housing walls being of a thickness and material which in the absence of said force transmitting means are incapable of accomodating the stresses of said reaction forces without excessive axial deformation.
In a servo booster assembly for vehicle brake systems comprising a housing having opposed housing walls each having radially inner and outer portions, a movable wall positioned between said housing walls and dividing the interior of said housing into two chambers, an output member having an operative connection with said movable wall and operable through said radially inner portion of one of said housing walls, means for controlling a supply of differential pressure to opposite sides of a said movable wall comprising a control valve assembly and an input member for operating said control valve assembly, the invention comprising stationary force transmitting means extending through said movable wall from the radially inner portion of one of said housing walls to the radially inner portion of the other of said housing walls, means sealing said movable wall to said force transmitting means, and means for connecting said housing to a relatively fixed vehicle bulkhead in a position adjacent to where said force transmitting means is located to transmit substantially directly to said bulkhead reaction forces which in the absence of said force transmitting means would be transmitted through both said radially outer portions of said housing walls, and substantially relieve at least said radially outer portions of said walls from said forces upon operation of said booster assembly, said housing walls being of a thickness and material which in the absence of said force transmitting means are incapable of accomodating the stresses of said reaction forces without excessive axial deformation.
Dependencies are inferred from the claim text.