Power plants – Pressure fluid source and motor – Pulsator
Patent
1987-07-20
1989-03-07
Garrett, Robert E.
Power plants
Pressure fluid source and motor
Pulsator
91532, 188349, 303 963, 303 965, F15B 700, F15B 1100, B60T 1100
Patent
active
048095052
ABSTRACT:
A master cylinder includes a hydraulic pressure control valve having a valve member mounted in a valve body and normally held apart from a valve seat by a valve spring. The valve member is seated on the valve seat when a pressure in a pressure chamber of a housing of the master cylinder reaches a predetermined level. A control device includes a body received in the bore and having one end portion of a convex shape. The body of the control device is urged by a spring in such a manner that the one end portion projects through a port of the housing into the pressure chamber. The control device including a seat prevention mechanism operatively associating the body of the control device with the valve member so as to prevent the valve member from seating on the valve seat when upon movement of the cylinder piston beyond a predetermined stroke, the cylinder piston engages the one end portion and urges the body of the control device toward the valve member in a direction perpendicular to the axis of movement of the cylinder piston.
REFERENCES:
patent: 2547233 (1951-04-01), Seppmann
patent: 4477122 (1984-10-01), Hayashida
patent: 4534172 (1985-08-01), Price et al.
patent: 4595243 (1986-06-01), Gaiser
patent: 4669268 (1987-06-01), Takeuchi et al.
patent: 4709968 (1987-12-01), Tanaka et al.
Kamemoto Katsuaki
Nakaharai Ken
Garrett Robert E.
Nippon Air Brake Co., Ltd.
Williamson Mark A.
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