Patent ID: 6070514
Filing Date: 2000-06-06
Classification: B60T

Abstract:
Pneumatic brake force booster for automotive vehicles, comprising:a booster housing having its interior subdivided by a movable wall into a first chamber (vacuum chamber) and a second chamber (working chamber),a control housing accommodating a control valve that controls a pneumatic pressure differential which acts upon the movable wall, the control valve including a first sealing seat that is provided on the control housing, a second sealing seat provided on a valve piston, and a third sealing seat provided on a sleeve, the sealing seats interacting with a valve member, wherein the control valve is operable by both an actuating rod and by an electromagnet independently of the actuating rod wherein the armature of the electromagnet is in force-transmitting interaction with the third sealing seat, wherein the valve member delimits a pneumatic chamber in the control housing on its side remote from the sealing seats, wherein a permanent pneumatic connection exists between the pneumatic chamber and the vacuum chamber, wherein the second and the third sealing seat and the sealing lip of the valve member have substantially identical diameters.