US 2013/0076114 A1 · BRAKE BOOSTER

Abstract

A brake booster for use in a hydraulic braking system having a brake pedal, a master cylinder, and a hydraulic control unit includes a housing, a screw drive arrangement positioned at least partially in the housing, a motor coupled to the housing for actuating the screw drive arrangement, and a piston assembly positioned in the housing. The piston assembly and the housing together at least partially define a first fluid chamber having an opening for providing fluid communication with the master cylinder, and a second fluid chamber having an opening for providing fluid communication with the hydraulic control unit. The screw drive arrangement is operable to move a piston of the piston assembly for varying the volume of the second fluid chamber, and movement of the piston does not vary the volume of the first fluid chamber.

Claims20

Dependent claims

A brake booster for use in a hydraulic braking system having a brake pedal, a master cylinder, and a hydraulic control unit, the brake booster comprising:

a housing;
a screw drive arrangement positioned at least partially in the housing;
a motor coupled to the housing for actuating the screw drive arrangement;
and
a piston assembly positioned in the housing, the piston assembly and the housing together at least partially defining
a first fluid chamber having an opening for providing fluid communication with the master cylinder;
and
a second fluid chamber having an opening for providing fluid communication with the hydraulic control unit;
wherein the screw drive arrangement is operable to move a piston of the piston assembly for varying the volume of the second fluid chamber;
and
wherein movement of the piston does not vary the volume of the first fluid chamber.

8 more elements

A hydraulic braking system comprising:

a brake pedal;
a master cylinder coupled with the brake pedal;
a hydraulic control unit coupled with a plurality of wheel brakes;
and
a brake booster coupled between the master cylinder and the hydraulic control unit, the brake booster including
a housing;
a screw drive arrangement positioned at least partially in the housing;
a motor coupled to the housing for actuating the screw drive arrangement;
and
a piston assembly positioned in the housing, the piston assembly and the housing together at least partially defining
a first fluid chamber having an opening in fluid communication with the master cylinder;
and
a second fluid chamber having an opening in fluid communication with the hydraulic control unit;
wherein the screw drive arrangement is operable to move a piston of the piston assembly for varying the volume of the second fluid chamber;
and
wherein movement of the piston does not vary the volume of the first fluid chamber.

13 more elements

Dependencies are inferred from the claim text.

Brake booster

Life of this patent

Brake booster

Life of this patent

Abstract

Claims20