Oil pump pressure control device

Abstract

The invention provides a pressure control device of an oil pump, which has a plurality of discharge sources, maintains the same characteristics as the pressure characteristics of a general flow pump by improving the oil circuit switching method, and reduces friction at the same time. Consists of: 1st discharge passage for supplying oil to the engine from the 1st set of rotors; 1st return passage returning to the suction side of the rotor; 2nd discharge passage for supplying oil to the engine from the 2nd set of rotors; returning to the 2nd set of rotors The second return passage on the suction side; the pressure control valve of the valve body is installed between the discharge port of the second group rotor and the first discharge passage. The first discharge passage and the second discharge passage are connected. In the low speed range, the flow path is controlled with only the first discharge passage and the second discharge passage open. In the middle speed range, the first discharge passage and the second discharge passage are opened. And the flow path is controlled in the state where the first discharge passage is closed and the second return passage is open. In the high-speed region, the flow is controlled by the state in which the second discharge passage is closed, the first discharge passage is open, and the first return passage and the second return passage are open. road.

Description

technical field [0001] The invention relates to a pressure control device of an oil pump, which has a plurality of discharge sources, and can maintain the same pressure characteristic as that of a general oil pump by improving the oil circuit switching method, and can reduce friction at the same time. Background technique [0002] As a prior art, there is a variable flow rate oil pump which divides one discharge port into two and has two discharge ports, but the discharge source is only one since it is a set of rotors. In addition, when the pump rotates at a high speed and consumes a lot of power, the oil passages of the main pump (first pump) and the sub pump (second pump) communicate. Thus, the pressures of the main pump and the sub pump are approximately equal. Although it is shown as a main pump and an auxiliary pump, it is originally a pump (a set of rotors). Even if there is useless work, it is not possible to reduce the useless work because it is a set of pumps. Fur...

AI Technical Summary

Problems solved by technology

In addition, since the discharge oil path of the auxiliary pump is immediately connected to the main pump through the valve, there is a restriction when changing the flow rate (pressure) of the auxiliary pump only by using the valve.

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