Vacuum booster, brake system equipped with the vacuum booster, and method of manufacturing plate plunger for vacuum booster

摘要

A method of manufacturing a plate plunger with which a reaction disc comes into contact and which determines a servo ratio of a vacuum booster, the plate plunger manufacturing method comprising primarily processing a plate plunger base material in such a way that an outer peripheral diameter of a reaction disc contact surface of the plate plunger becomes equal to or greater than an outer peripheral diameter, and forming the reaction disc contact surface of the plate plunger in such a way that it has an outer peripheral diameter corresponding to a desired servo ratio by secondarily processing a servo ratio determination surface.

主权项

1. A method of manufacturing a plate plunger with which a reaction disc comes into contact and which determines a servo ratio of a vacuum booster, the plate plunger manufacturing method comprising:
a) processing a plate plunger base material in a primary process in such a way that an outer peripheral diameter of a reaction disc contact surface of the plate plunger base material becomes equal to or greater than an outer peripheral diameter corresponding to the smallest servo ratio among a variety of different servo ratios; and b) forming the reaction disc contact surface of the plate plunger in a secondary process that is different from the primary process so that the outer peripheral diameter of the reaction disc contact surface corresponds to a desired servo ratio, wherein the secondary process includes removing material of the reaction disc contact surface to form a servo ratio determination surface that determines the servo ratio on a corner portion between an outer peripheral diameter of the plate plunger and a surface of the plate plunger that opposes the reaction disc.