Dual-rate brake vacuum booster

Abstract

The present invention provides a dual-rate brake vacuum booster including a control valve body, a rubber reaction plate and a reaction rod, the rubber reaction plate being clamped between an end face of the control valve body and a base plate of the reaction rod, wherein accommodating spaces for accommodating an expansion deformation of the rubber reaction plate are respectively provided between a periphery of an end portion on one side of the rubber reaction plate and a periphery of the end face of the control valve body, and between a periphery of an end portion on the other side of the rubber reaction plate and the base plate of the reaction rod. The dual-rate brake vacuum booster prolongs the service life of the rubber reaction plate and can realize the dual-rate braking without using an additional element, thereby resulting in easy processing, simple structure and reduced cost. s

Dependencies are inferred from the claim text.