Hydraulic brake force-multiplying device

Power plants – Pressure fluid source and motor – Pulsator

Patent

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Details

60566, 60592, 91391R, B60T 1358

Patent

active

039423263

ABSTRACT:
A hydraulic brake force-multiplying device includes a body, an output member fitted slidably in the body, a working chamber defined between the output member and the body, a pressure chamber defined in the body and receiving pressure fluid introduced from a source of pressure fluid, a valve seat member positioned in the pressure chamber and urged against the body under fluid pressure of the pressure chamber, a rod member provided integrally with the valve seat member and extending to the interior of the working chamber, a guide bore extending through the rod member axially, a valve stem having a valve portion adapted to cooperate with a valve seat of the valve seat member, thereby forming a valve mechanism in combination with the valve seat, and being sealingly and slidably fitted in the guide bore, an input shaft provided in the body adjacent to one end of the valve stem remote from the working chamber, an intermediate chamber defined between the input shaft and the valve stem and adapted to be communicated by way of the valve mechanism with the pressure chamber, a passage provided in the valve stem and communicating the intermediate chamber with the working chamber by way of the guide bore, and a passage provided in the input shaft for providing communication between the intermediate chamber and a drain tank, the communication therebetween being blocked when the input shaft is actuated so as to engage with the valve stem.

REFERENCES:
patent: 3173339 (1965-03-01), Larsen
patent: 3208212 (1965-09-01), Schultz
patent: 3253409 (1966-05-01), Kellogg et al.
patent: 3327479 (1967-06-01), Harness et al.
patent: 3410090 (1968-11-01), Thirion
patent: 3473849 (1969-10-01), Smith et al.
patent: 3875748 (1975-04-01), DeHoff

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