Pneumatic brake booster
AssigneeRobert Bosch GmbH
InventorsBruno BERTHOMIEU, Esteve CORTES, Jaume CASASNOVAS
Life of this patent
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Abstract
A pneumatic brake booster includes a drive piston actuating a master cylinder by a push rod while being returned to rest position by a return spring. The brake booster has a vibration damper having a part made of an elastic material working compressively, of overall parallelepipedic shape, with a length greater than the spacing of two coils of the spring prior to its installation in the brake booster and whose front and back faces are equipped with a longitudinal slit penetrating the material mass of the damper for engagement by way of those slits on the two coils of the return spring.
Claims8
1-6. (canceled)
A pneumatic brake booster, comprising:
- a drive piston connected by a membrane to a brake booster cylinder to subdivide the latter into a forward chamber and a rear chamber and operate by a pressure drop to push the piston of the master cylinder by means of a push rod, the pressure drop in the cylinder driving the drive piston being controlled by a plunger valve actuated by the movement of the control rod connected to the brake pedal, the drive piston being thrust into rest position by a return spring supported by the wall of the cylinder;
- and
- a vibration damper, included with the return spring, wherein the vibration damper includes a part made of an elastic material working compressively, of overall parallelepipedic shape, with a length greater than a spacing of two coils of the spring prior to installation in the brake booster and whose front and back faces are equipped with a longitudinal slit penetrating the material mass of the damper, for engagement by way of the two slits on two neighboring coils of the return spring.
Dependencies are inferred from the claim text.