Master cylinder and method of manufacturing the same

Details Master cylinder and method of manufacturing the same Master cylinder and method of manufacturing the same

2011-01-11

2011-01-11

Lazo, Thomas E (Department: 3745)

Power plants

Pressure fluid source and motor

Pulsator

Reexamination Certificate

active

07866155

ABSTRACT:
An object of the present invention is to provide a master cylinder capable of controlling an increase in an intruding amount of a cup seal while relieving a stress concentration therein to thereby prevent the cup seal from being damaged. Provided is a master cylinder in which a piston is moved in slidable contact with an inner circumference of a cup seal held in a cylinder main body so as to pressurize a brake fluid in a pressure chamber formed of the piston and the cylinder main body, wherein an annular wall configured integrally with the cylinder main body is provided behind the cup seal. Further, a chamfered portion having a curved shape in a cross-section taken along a diameter direction of the cylinder main body is provided between the annular wall and a cylinder wall to which the piston is facing. One end of the chamfered portion is formed continuously so that a tangent thereto is in line with the annular wall, and the other end of the chamfered portion is formed to constitute a flexed portion in combination with the cylinder wall.

REFERENCES:
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patent: 7694516 (2010-04-01), Mouri et al.
patent: 2008/0087016 (2008-04-01), Shepherd et al.
patent: 2006-123879 (2006-05-01), None

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