Master cylinder and servo booster assemblies for vehicle braking systems

Claim 1

A master cylinder and servo booster assembly for a vehicle braking system comprising a master cylinder housing positioned in front of a booster housing, a movable wall housed within said booster housing, a booster output rod connected with said movable wall and extending forwardly therefrom for operating said master cylinder, a stationary force transmitting tube co-axial with the axis of said output rod and extending through said movable wall, means sealing said movable wall to said tube, said tube comprising a front end adjacent to said master cylinder, said front end being provided with a plurality of rearwardly extending slots which are open at their front ends and between which are defined a plurality of forwardly directed arms of said tube, a front end portion of each arm, and a rear end portion of said master cylinder housing, one of said portions being provided with a projection directed radially of said axis, and the other of said portions being provided with a complementary radially directed recess in which said projection is received, whereby each arm is secured to said master cylinder housing for transmitting braking reaction forces from said master cylinder housing to said tube, a retaining means holding each said projection operatively engaged with the corresponding recess, and means holding said retaining means against movement relative to said booster housing, said arms being sufficiently resiliently flexible so that during assembly of said arms to said master cylinder housing, with the rear end of each said arm held at a fixed radial distance from said axis the front end of each said arm can be resiliently deflected in a radial direction to enable said master cylinder housing to be moved axially relative to said arms to being each said projection into registery with its corresponding recess.