Variable displacement vane pump with vane tip relief

Details Variable displacement vane pump with vane tip relief Variable displacement vane pump with vane tip relief

1995-07-31

1998-02-10

Freay, Charles G.

Rotary expansible chamber devices

With changeable working chamber magnitude

By cylinder or cylinder portion pivotal movement

418180, 418189, 417284, F01C 2116

Patent

active

057162018

ABSTRACT:
A variable displacement vane pump having a vaned rotor adjustably contained within a cam member for rotation between fuel inlet and fuel discharge arcs. Adjacent vanes form enclosed fuel bucket areas which are expanded and axially-supplied with fuel in the fuel inlet arc and are contracted and axially-discharge the fuel in the fuel discharge arc. Fuel circulation is improved by providing a central recess at each vane tip and/or a central groove in the cam surface to prevent trapping, stagnation and overheating of fuel at the centerpoints of the bucket areas, which overheating can result in expansion of the vane tips, scoring of the cam surface and pump failure.

REFERENCES:
patent: 2433484 (1947-12-01), Roth
patent: 4919248 (1990-04-01), Hiramatsu et al.
patent: 5046933 (1991-09-01), Haga et al.
patent: 5141418 (1992-08-01), Ohtaki et al.
patent: 5366354 (1994-11-01), Yuge

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