Patent ID: 7694517
Filing Date: 2010-04-13
Classification: B60T,F15B,Y10T

Abstract:
1. A master cylinder including: a cylinder body to which operating fluid is introduced from a reservoir, the cylinder body having a pressure chamber therein; a supply passage for supplying operating fluid from the reservoir to the pressure chamber; a piston slidably fitted in the cylinder body to define the pressure chamber and to open and close the supply passage according to a sliding position of the piston; and a bypass for bypassing the supply passage and connecting the reservoir and the pressure chamber, the bypass having a check valve system that is adapted to open when a pressure in the pressure chamber is lower than that in the reservoir, to thereby allow operating fluid to flow from the reservoir to the pressure chamber, wherein the check valve system comprises: a cartridge including a valve case having an opening at one end and a cover for closing the opening at the end; a valve body disposed in the cartridge and adapted to detachably seat on a valve seat; and an urging means disposed in the cartridge to urge the valve body in a direction of seating it, such that the cartridge containing the valve body and the urging means is communicably disposed in the bypass.