Adjustable pressure limiting valve and manufacturing method of engine

1. The utility model relates to the technical field of engines, specifically, to an adjustable pressure limiting valve and an engine.

Background technique:

2. Due to changes in speed and load during engine operation, the oil pressure will fluctuate greatly, which affects the establishment of oil film on the surface of moving parts. Engine oil is the most important protective agent of the engine, which directly affects the safety of the engine and the life of parts.

3. In order to keep the oil pressure stable, a pressure limiting valve is generally used to adjust the oil pressure. The pressure limiting valve includes a spring and a valve core. When the oil pressure is too high, the oil pressure overcomes the elastic force of the spring to push the valve core to move, thereby opening the oil outlet of the pressure limiting valve and draining part of the oil to reduce the oil pressure. When the oil pressure is too low, the spring pushes the valve core to close the oil outlet to keep the oil pressure stable. However, when the oil pressure changes suddenly, the pure spring-type oil drain adjustment speed is slow, resulting in large pressure fluctuations, and the pressure adjustment effect is not obvious. In addition, when the oil pressure is set high or the flow rate is large, the elastic coefficient of the spring will increase correspondingly, and the volume of the pressure limiting valve will also increase correspondingly, which affects the reliability and applicability of the device.

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