Variable displacement oil pump with pressure relief groove

Abstract

The invention discloses a variable displacement oil pump with a pressure relief groove. An oil pump oil outlet cavity and an oil pump oil absorption cavity are arranged on a pump body and a pump cover, an adjusting ring is arranged in the pump body, a protrusion is arranged on the outer circumference of the adjusting ring, the radial outer end face of the protrusion is in sealed connection with an inner cavity, the protrusion is provided with a first side and a second side along the circumference, the first side is towards a pressure control cavity communicated with the oil pump oil outlet cavity, the second side is connected with an adjusting mechanism, the protrusion is provided with a third side and a fourth side in the radial direction, the third side is in sealed connection with the pump body, the fourth side is in sealed connection with the pump cover, the pump cover is further provided with the pressure relief groove, one end of the pressure relief groove is communicated with the oil pump oil absorption cavity, and the other end of the pressure relief groove is arranged at the position of the fourth side corresponding to the pump cover. The characteristic that the change of the adjusting ring of the variable displacement oil pump is changed along with oil pressure changes is utilized to control whether the pressure relief groove is communicated with the pressure control cavity, and a pressure relief function of an ordinary oil pump pressure relief groove is achieved.

Description

technical field [0001] The invention relates to the field of engine oil pumps, in particular to a variable displacement engine oil pump with a pressure relief groove. Background technique [0002] Due to the structural limitation of the traditional oil pump, the displacement of the oil pump is fixed, and the outlet flow of the oil pump is directly proportional to the speed of the oil pump. As the speed of the oil pump increases, the outlet flow of the oil pump will increase proportionally. Therefore, when the oil pump is running at a high speed, the oil pump capacity of the oil pump is excessive, and the oil pressure is high, so it is necessary to increase the pressure relief valve to release the excess oil. [0003] Although the mechanically controlled variable displacement oil pump can reduce the displacement of the oil pump through the adjustment mechanism, in order to take into account the oil pressure requirements at various speeds, the oil pump capacity of the oil pum...

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Problems solved by technology

[0003] Although the mechanically controlled variable displacement oil pump can reduce the displacement of the oil pump through the adjustment mechanism, in order to take into account the oil pressure requirements at various speeds, the oil pump capacity of the oil pump will be excessive at high speeds

[0004] Therefore, it is necessary to increase the pressure relief valve to release excess oil; the traditional pressure relief valve mechanism includes: screw plug, spring, guide rod, piston and other parts, the structure is complex and the cost is high

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