Gear type engine oil pump for reducing oil pressure fluctuation

Abstract

The invention provides a gear type engine oil pump for reducing oil pressure fluctuation, and relates to the technical field of engine lubricating systems. The gear type engine oil pump comprises a pump body, a pump cover, a driving gear, a driving shaft, a driven gear, a driven shaft, a transmission gear and a pressure regulating valve, wherein the pressure regulating valve comprises a pressure regulating valve hole, a pressure regulating valve plunger piston arranged in the pressure regulating valve hole, and a pressure regulating valve spring; a feedback oil chamber is formed between one end of the pressure regulating valve plunger piston and the pressure regulating valve; a feedback oil pipe is arranged on the pump cover; a blocking screw is mounted at one end of the feedback oil pipe,and the other end of the feedback oil pipe communicates with the feedback oil chamber; a feedback oil pipe hole is formed in the feedback oil pipe; a feedback oil channel which enables communicationbetween the feedback oil pipe hole and an engine main oil channel is arranged on the pump body; the feedback oil channel comprises a damping hole channel; and the inside diameter of the damping hole channel is less than the inside diameter of the feedback oil channel. With the adoption of the gear type engine oil pump, oil pressure fluctuation fed back by the engine main oil channel can be greatlyfiltered, so that the problem that the pressure regulating valve is turned on by mistake due to the oil pressure fluctuation can be extremely reduced.

Description

technical field [0001] The invention relates to the technical field of engine lubricating systems, in particular to a gear type oil pump for reducing oil pressure fluctuations. Background technique [0002] With the continuous development of engine technology, the industry has higher and higher technical requirements for the oil pump in the engine lubrication system. For different types of engines, matching oil pumps are required to provide the engine with stable oil pressure, abundant flow, and Lubricating oil with reliable performance. [0003] The structure of the oil pump can be divided into two types: gear type and rotor type. The working principle of the gear type oil pump is that when the engine is working, the driving gear on the camshaft drives the transmission gear of the oil pump, so that it is fixed on the driving gear shaft. The driving gear rotates, thereby driving the driven gear to rotate in the opposite direction, and the oil is sent from the oil inlet cham...

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Problems solved by technology

[0004] Existing gear oil pumps are generally equipped with a pressure regulating valve to facilitate the transfer of a part of the oil from the oil outlet chamber back to the oil inlet chamber for recirculation when the oil pressure is too high, thereby ensuring the oil pressure in the main oil passage of the engine to be stable. In the actual working process, there are certain pressure fluctuations in the oil pressure in the main oil passage of the engine. During the fluctuation process, the oil pressure will have a short-term pressure peak. When the pressure peak just exceeds the opening pressure threshold of the pressure regulating valve, the pressure regulating valve will Open, because the oil pressure in the main oil passage of the engine returns to normal after the pressure peak recedes quickly, but at this time the pressure regulating valve is opened (equivalent to valve misoperation caused by pressure fluctuations), which leads to further fluctuations in the oil pressure in the main oil passage of the engine Intensify, enter a vicious cycle

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