Master cylinder with return spring

Details Master cylinder with return spring Master cylinder with return spring

1995-04-24

1996-10-01

Ryznic, John E.

Power plants

Pressure fluid source and motor

Pulsator

92135, B60T 700, B01D 5302

Patent

active

055602061

ABSTRACT:
An object of the present invention is to provide a master cylinder in which the buckling of spring is prevented and the packing is not damaged. To achieve this object, in a master cylinder in which a return spring is disposed between the end wall of a cylinder and a piston, and a packing fitted to the piston slides on the inner peripheral wall of the cylinder, the return spring 30 comprises a cylindrical large-diameter coil portion A with a diameter almost in contact with the inner peripheral wall of the cylinder 12 and a small-diameter coil portion B with a diameter enough smaller than the diameter of the inner peripheral wall of the cylinder 12, and the installation length of the small-diameter coil portion B is set so as to be nearly equal to a length of the range in which the packing 24 slides.

REFERENCES:
patent: 3686864 (1972-08-01), Shutt
patent: 4004425 (1977-01-01), Pickering
patent: 4162616 (1979-07-01), Hayashida
patent: 4201054 (1980-05-01), Bainbridge
patent: 4224727 (1980-09-01), Miyashita
patent: 4324101 (1982-04-01), Farr
patent: 4356694 (1982-11-01), Koshimuzu et al.
patent: 5349820 (1994-09-01), Yanagi et al.

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