Portless type master cylinder device with non return valve and r

Details Portless type master cylinder device with non return valve and r Portless type master cylinder device with non return valve and r

1986-10-15

1988-09-27

Chambers, A. Michael

Power plants

Pressure fluid source and motor

Pulsator

60585, B60T 1120

Patent

active

047732245

ABSTRACT:
In this portless type master cylinder device, a cylinder bore is formed in a body thereof, and a piston member is fitted in the cylinder bore and is slidably movable from an initial axial position therein and defines a pressure chamber in cooperation with the cylinder bore. An intake valve communicates between the cylinder chamber and the fluid reservoir via a fluid flow path, and is opened when the piston member is in its initial axial position while it is closed when the piston member moves through more than a determinate relatively small axial distance from its initial axial position. Intermediately along the fluid flow path between the intake valve and the fluid reservoir, there are provided in parallel a non return valve which allows substantially free flow of fluid from the fluid reservoir to the intake valve but not substantially in the reverse direction, and a means for allowing flow of fluid from the intake valve to the fluid reservoir with a relatively high flow resistance being presented to the flow. Thereby, the stroke of the piston member has a much reduced inactive initial stroke portion, as compared with other portless type master cylinder devices, and the operational feeling of the master cylinder device is greatly improved.

REFERENCES:
patent: 4267697 (1981-05-01), Hodkinson
patent: 4445333 (1984-05-01), Coleman
patent: 4492082 (1985-01-01), Belart
patent: 4550567 (1985-11-01), Schaefer
patent: 4621498 (1986-11-01), Schaefer
patent: 4640098 (1987-02-01), Brademeyer et al.

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