AMP, ADJUSTABLE Resizing plastically deformable BUSHES, and devices for plastic deformation and resizing SLEEVES

摘要

The invention concerns a brake servo unit comprising a piston actuating a master-cylinder, including an elastic return control rod sliding in the piston in accordance with an input force, whereof the end bears a plunger carrying a sliding probe (52) capable of stressing a reaction disc of the actuating rod to transmit to the control rod the piston reaction, and comprising a one-way clutch release device comprising a key and a bushing (58) including the probe (52) which is mounted sliding on the plunger, and which can, when the control rod is actuated at a predetermined speed, lock the bushing (58) relative to the mobile piston independently of the control rod. The invention is characterised in that the bushing (58) comprises first and second adjusting parts (104, 106) plastically deformable in the axial direction to adjust beforehand the servo unit. The invention also concerns a deformation assembly to produce such a bushing (58).