| 摘要 |
According to the invention, a first spring abutment which extends radially outward is formed on a valve plunger, which forms part of a reaction mechanism for brake booster. A second spring abutment which extends radially outward is formed on a plate plunger. A plurality of coiled springs are disposed in parallel across the pair of spring abutments, and a brake reaction is transmitted to the valve plunger through the plate plunger, the second spring abutment, the plurality of the coiled springs and the first spring abutment. With this construction, the plurality of coiled springs which are disposed in parallel provide a combined spring constant, which is given as a sum of spring constants of individual coiled springs, whereby a combined spring constant of an increased magnitude can be obtained. This allows a servo ratio of the brake booster while the plurality of coiled springs are being compressed to be freely chosen as compared with the prior art.
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