Patent ID: 7073333
Filing Date: 2006-07-11
Classification: B60T,F15B

Abstract:
1. A master cylinder comprising: a cylinder body; a primary piston and a secondary piston that are received in said cylinder body so as to be arranged in series with each other, thereby defining a first pressure chamber and a second pressure chamber in said cylinder body; said cylinder body carrying cups with which said primary and secondary pistons are in sliding contact; a reservoir having its interior in communication with said first pressure chamber through a first fluid passage and with said second pressure chamber through a second fluid passage; said primary and secondary pistons being configured to be moved under external force to close said first and second fluid passages, thereby pressurizing hydraulic fluid in said first and second pressure chambers and discharging the thus pressurized hydraulic fluid through output ports; throttle valves each received in one of said first and second fluid passages, and comprising a valve seat having its radially outer portion liquid-tightly joined and fixed to said cylinder body, and a floating valve body configured to be moved into contact with said valve seat under a pressure difference when hydraulic fluid is returned from said first and second pressure chambers into said reservoir, thereby closing said throttle valve, wherein a fixed position of said valve seat and a lowermost position of said floating valve body are determined by said cylinder body.