ROTATIONAL-SPEED-CONTROLLING VARIABLE PISTON PUMP

WIPO Patent Application WO/2016/167070

A1

Provided is a rotational-speed-controlling variable piston pump with which it is possible to satisfactorily avoid abnormal pressures in the bore chamber of a cylinder block with a simple configuration, without causing loss of pump efficiency or increases in cost. The present invention provides a rotational-speed-controlling variable piston pump in which pistons move back and forth within a bore at a stroke suited to the angle of inclination of a swash plate along with the rotation of a cylinder block, whereby hydraulic oil is drawn into a bore chamber from an intake oil passage formed in a casing, via an intake port of a port plate against which the cylinder block slides, and the hydraulic oil is discharged to a discharge oil passage formed in the casing, via a discharge port of the port plate; wherein an abnormal-pressure-avoiding oil pressure circuit, which releases the hydraulic oil in the bore chamber out of the bore chamber when the pressure in the bore chamber positioned between the intake port and the discharge port of the port plate exceeds a predetermined pressure, is provided as being incorporated in the same unit structure within the same casing.

JP2014092048	VARIABLE DISPLACEMENT TYPE AXIAL PISTON DEVICE
WO/2010/019582	DEDICATED PULSING VALVE FOR COMPRESSOR CYLINDER

HIRAIDE HIROKAZU (JP)
TSUKADA YUYA (JP)

PCT/JP2016/058125

October 20, 2016

March 15, 2016

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YUKEN KOGYO CO LTD (JP)

F04B1/22; F04B49/10

JPS5642441Y2	1981-10-05
JPH10252642A	1998-09-22
JPH08312524A	1996-11-26
JPH08210242A	1996-08-20
JPS55152369U	1980-11-04

HANAMURA, Futoshi (JP)
Futoshi Hanamura (JP)

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