Rotary expansible chamber devices – Grooved abutting cylinder-rotating member end surfaces – Grooved working member surface
Patent
1991-03-07
1992-10-13
Bertsch, Richard A.
Rotary expansible chamber devices
Grooved abutting cylinder-rotating member end surfaces
Grooved working member surface
418 82, 418268, F04C 200, F04C 1500
Patent
active
051545934
ABSTRACT:
A device for improving the starting response of a vane pump and for reducing the power loss during a high speed operation of the pump. The vane pump includes a rotor formed with slits, in which slits vanes are slidably disposed. To drive the respective vanes into abutment against a cam ring, a pair of plates which hold the rotor and the cam ring sandwiched therebetween are formed with a plurality of arcuate grooves, into which a discharged oil is introduced. Rather than providing a narrow groove formed in the same plate as that in which the arcuate grooves are formed to provide a communication therebetween, an annular groove is formed in the lateral surface of the rotor to replace the narrow groove or in addition to the narrow groove, and is constructed so that the narrow groove is interrupted by the vanes as the vanes retract, the annular groove providing a communication between the arcuate grooves when a respective vane is driven radially outwardly.
REFERENCES:
patent: 3516767 (1970-06-01), Perkins
patent: 3598510 (1971-08-01), Aoki
patent: 3915598 (1975-10-01), Kalen et al.
patent: 4386891 (1983-06-01), Riefel et al.
patent: 4507065 (1985-03-01), Shibuya et al.
patent: 4795325 (1989-01-01), Kishi et al.
Konishi Hideo
Odai Junkichi
Bertsch Richard A.
Cavanaugh D. L.
Jidosha Kiki Co. Ltd.
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