Patent ID: 6880447

Claim:
Transmission device for the brake force of a brake force booster with an elastic reaction element, an input member acting on the reaction element by way of an input effective surface, and with an output member acting on the reaction element by way of an output effective surface, with at least part of the force exerted on the output effective surface being taken up by a control housing of the brake force booster, and with modification means being provided that modify the force transmission ratio between input member and output member defined by the ratio of the effective surfaces in dependence on the forces exerted on the reaction element by way of the effective surfaces or the deformation of the reaction element caused hereby, wherein on the input side a part of the surface of the reaction element is supported on the input member by way of a switching ring and by way of a spring element and, with rising force applied to the reaction element, the switching ring is displaced in opposition to the force of the spring element towards a stop on the control housing, makes catch at said stop and thereby decreases the input effective surface.