BRAKE SYSTEM

Japanese Patent JPS63212161

A

A brake unit having a hydraulic brake booster and twin master cylinders in a common housing. The brake booster comprises a drive cylinder between the master cylinders which can be subjected to the outlet pressure of a brake valve of the brake booster which supplies an outlet pressure proportional to the pedal travel. A compensating cylinder, which jointly executes the strokes of the drive-cylinder piston and can likewise be subjected to the outlet pressure of the brake valve transmits the actuating forces generated by the drive cylinder to the pistons of the master cylinders via a rocker articulated pivotably on the compensating piston. The effective piston surface of the compensating cylinder is somewhat larger than that of the drive piston. The stroke of the relative movements of the compensating cylinder piston in relation to the piston of the drive cylinder is limited to a distance, within which, at the start of a braking operation, the master cylinder pistons are displaceable from their basic positions, in which the outlet pressure spaces are still pressureless, to such an extent that the outlet pressure spaces of the master cylinders are shut off from the brake fluid storage tank and any further displacement leads to a pressure build-up. This ensures an "idle-travel compensation" which guarantees a close approximation to a linear relationship between the brake pressure and pedal travel.

HAINTSU RAIBAA

JP569988A

September 05, 1988

January 13, 1988

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DAIMLER BENZ AG

B60T13/12; B60T13/14; (IPC1-7): B60T13/12

JPS5474974A	1979-06-15
JPS5653949A	1981-05-13

Keinosuke Ozawa

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