Patent ID: 6141963
Filing Date: 2000-11-07
Classification: B60T

Abstract:
A master cylinder comprising: a cylinder housing consisting of a body having an opening at one end and a cap joined to the opening of said body; a sleeve fitted in said cylinder housing; a piston inserted in said cap and slidably provided so as to be guided by said sleeve and a piston guide; and a pressure chamber defined by said piston and said cylinder housing, whereina first supply passage is formed in said cylinder housing to supply a working fluid from an outside working fluid supply source to said pressure chamber through a working fluid supply port formed in said piston, a second supply passage is formed in parallel with the first supply passage directly between said working fluid supply source and said pressure chamber, and a check valve is disposed in said second supply passage, andwhen the pressure in said pressure chamber is lower than the pressure of said working fluid supply source, said check valve is opened, thereby allowing the working fluid to flow to said pressure chamber, and when the pressure in said pressure chamber is higher than the pressure of said working fluid supply source, said check valve is closed, thereby inhibiting the flow of the working fluid from said pressure chamber to said working fluid supply source.