Variable-displacement oil pump

Abstract

The invention discloses a variable-displacement oil pump. A hinge point (6), a first seal point (11), a second seal point (12) and a third seal point (13) are arranged between the outer circumferential wall of a swing ring (2) and a pump body (1). The first seal point (11) and the second seal point (12) are located on the two sides of the hinge point (6) correspondingly. The connection position, between a swing arm (15) and the pump body (1), on the swing ring (2) is the third seal point (13). The distance between the hinge point (6) and the first seal point (11) is larger than the distance between the hinge point (6) and the second seal point (12). A cavity between the first seal point (11) and the hinge point (6) and a cavity between the second seal point (12) and the hinge point (6) both communicate with an oil outlet of the oil pump. After the above structure is adopted, the number of parts is decreased, and therefore cost of products is reduced, and meanwhile the overall size of the oil pump is also reduced.

Description

technical field [0001] The invention relates to the technical field of oil pumps, in particular to a variable displacement engine oil pump. Background technique [0002] When the automobile engine is working, each moving part acts on another part with a certain force, and high-speed relative motion occurs. With relative motion, friction will inevitably occur on the surface of the parts, thereby accelerating wear. Therefore, in order to reduce wear, reduce frictional resistance, and prolong service life, there must be a lubrication system on the engine. The main components of the lubrication system are various equipment such as an oil pump. The function of the oil pump is to increase the oil to a certain pressure and then forcefully send it to the moving surfaces of the various parts of the engine. Due to the structural limitation of the traditional oil pump, the displacement of the oil pump is fixed. The outlet flow of the oil pump is proportional to the speed of the oil pu...

AI Technical Summary

Problems solved by technology

However, the shortcoming of this variable-displacement oil pump provided with a pressure relief valve is: due to the limited space for assembly of the automobile engine itself, it is determined that the smaller the volume of the relevant spare parts, the better. However, on the variable-displacement oil pump After the pressure relief valve is added, on the one hand, the cost of parts is increased. On the other hand, the pressure relief valve contains parts such as plugs, springs, guide rods, and pistons, which increase the structural complexity of the oil pump and also increase the cost of the oil pump. overall volume

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