Brake booster for the anti-wheel locking of a motor vehicle brake system
AssigneeRobert Bosch GmbH
InventorHeinz Leiber
Life of this patent
Estimating the term…
Abstract
A brake booster connected to a dual circuit vehicle brake system includes a housing within which there is located a booster piston and an auxiliary piston interconnected so that the displacement of the auxiliary piston in the direction of the booster piston is communicated to the booster piston. This displacement occurs when the pressure in a reservoir, to which the auxiliary piston is exposed, falls below a predetermined level. The displacement communicated to the booster piston in turn displaces the booster piston to a predetermined position which is located relative to a brake pedal push rod so that the brake pedal push rod can execute an idle stroke.
Claims31
A brake booster for the anti-wheel locking of a motor vehicle brake system having brake pedal actuation and two hydraulic integral brake circuits, the booster comprising:
- a housing within which a booster cylinder is defined;
- a booster piston mounted for displacement within the booster cylinder;
- a pressure medium supply bore connected to the booster cylinder;
- a pressure medium return bore connected to the booster cylinder, both bores forming part of one of the two brake circuits;
- a control valve mounted to the housing for controlling the pressure medium flow in the supply and return bores;
- connecting means for connection to the brake pedal;
- a travel limiting spring located between the control valve and the connecting means for transmitting brake pedal forces to the control valve;
- a reservoir;
- an auxiliary piston mounted for displacement within the reservoir under the influence of a pressure medium within the reservoir;
- and
- force transmitting means connecting the booster piston and the auxiliary piston, for displacing the booster piston to a predetermined position which allows the brake pedal to execute an idle stroke relative to the booster piston.
In combination, a multi-position member, a pressure medium source connected to the multi-position member, and a brake booster connected to the multi-position member, said combination serving as the anti-wheel locking apparatus of a motor vehicle brake system, the brake booster comprising:
- a housing within which a booster cylinder is defined;
- a booster piston mounted for displacement within the booster cylinder;
- a pressure medium supply bore connected to the booster cylinder;
- a pressure medium return bore connected to the booster cylinder, both bores forming part of one of the two brake circuits;
- a control valve mounted to the housing for controlling the pressure medium flow in the supply and return bores;
- connecting means for connection to the brake pedal;
- a travel limiting spring located between the control valve and the connecting means for transmitting brake pedal forces to the control valve;
- a reservoir;
- an auxiliary piston mounted for displacement within the reservoir under the influence of a pressure medium within the reservoir;
- and
- force transmitting means connecting the booster piston and the auxiliary piston, for displacing the booster piston to a predetermined position which allows the brake pedal to execute an idle stroke relative to the booster piston.
Dependencies are inferred from the claim text.