Master cylinder with micro-sized grooves in piston guide

Details Master cylinder with micro-sized grooves in piston guide Master cylinder with micro-sized grooves in piston guide

1990-02-09

1991-12-24

Look, Edward K.

Expansible chamber devices

With guide or seal on cylinder end portion for piston or...

92171001, 60562, 60588, 60592, F16J 1518, B60T 1120

Patent

active

050741977

ABSTRACT:
In a master cylinder for use in various braking devices of an automatic vehicle and the like, a cylinder housing is constituted by a body having an opening at one end thereof and by a cap which is coupled with the body to close the opening. A piston is inserted through the cap and is freely slidably arranged inside the cylinder housing and is guided by a piston guide or a sleeve having a path which is in communication with an external fluid path. The master cylinder has a single groove or a plurality of grooves with a micro-sized depth defined in the surface of the piston guide where it engages the cylinder housing between the external fluid path and a pressure chamber defined by the master cylinder and piston. The master cylinder also has a tapered portion provided on the inner surface of the cylinder housing, and another tapered portion is provided on the end of the sleeve. The sleeve is assembled to the cylinder housing by bringing the tapered portion into abutment with the tapered portion on the cylinder housing.

REFERENCES:
patent: 4249381 (1981-02-01), Gaiser
patent: 4474005 (1984-10-01), Steer
patent: 4510752 (1985-04-01), Gaiser
patent: 4527395 (1985-07-01), Gaiser et al.
patent: 4718234 (1988-01-01), Steer
patent: 4790138 (1988-12-01), Steer

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