Oil pump pressure control device

Abstract

The invention provides a flow quantity variable oil pump having two discharge ports and using three rotors. The inventive oil pump maintains pressure property same with that of normal oil pumps and reduces friction at the same time. The inventive oil pump comprises a first discharge passage (11) for supply oil to the engine; a return passage (E) that returns to an intake side of an outer circumferential side rotor (A); a second discharge passage (13) for supplying oil to the engine; a return passage (E) that returns to an intake side of an inner circumferential side rotor (B); and a pressure control valve whose valve main body is provided between a discharge port from the inner circumferential side rotor and the first discharge passage. The first and second discharge passage are coupled, and a flow passage control is executed in each of: a low revolution range in a state in which only the first and the second discharge passage are open; an intermediate revolution range in a state in which the first and second discharge passage are open and a first intake side of the return passage is closed while a second intake side of the return passage is open; and a high revolution range in a state in which the second discharge passage is closed while the first discharge passage and the return passage are open.

Description

technical field [0001] The present invention relates to a pressure control device of an oil pump. In a variable flow rate type oil pump having two discharge ports and using three rotors as a mechanism for providing the two discharge sources, the method is improved by improving the oil passage switching method. The pressure (oil pressure) characteristic is not a multi-stage characteristic but can reduce friction while maintaining the same characteristic as the pressure characteristic of a general oil pump. Background technique [0002] Conventionally, according to Patent Document 1, three rotors themselves are known as a mechanism for sending oil to two places. In Patent Document 1, only a mechanism for sending oil to two places is shown, and other effects are not shown. [0003] (Patent Document 1) Japanese Patent Laid-Open No. 11-280666 [0004] (Patent Document 2) Japanese Patent Laid-Open No. 2005-140022 [0005] (Patent Document 3) Japanese Patent Laid-Open No. 2002-7...

AI Technical Summary

Problems solved by technology

In addition, since two discharge sources are discharged from the same rotor, the timing of the discharge pulsation overlaps, and there is also a disadvantage that noise and vibration overlap and become larger.

In addition, since there is one set of rotors, there is a disadvantage that even if waste work is generated, there is no mechanism for reducing waste work in the rotor.

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