Circular inside-release oil pump

Abstract

The invention discloses a circular inside-release oil pump composed of a pump body, a rotor pair, a pressure limiting valve, a spring, an end plug, a seal ring and a pump cap. The pump body is provided with an oil inlet, an oil outlet, a pressure limiting hole, an inside-release oil channel, an oil-in chamber, an oil-out chamber, a rotor hole, a rotor shaft hole, a main mounting hole, a locating hole, a side mounting hole and a flange hole. The pressure limiting valve, the spring, the seal ring and the end plug are sleeved with the pressure limiting hole, the break-off side of the pressure limiting hole is provided with an oil release hole and an oil drainage hole which communicate with the inside-release oil channel, a circle is disposed between the oil release hole and the oil drainage hole. The rotor pair is sleeved with the rotor hole and the rotor shaft hole, the pump cap is fixed to the pump body, and a clearance fit is provided between the pump body and the rotor pair. The rotor rotates clockwise in the rotor pair, oil is taken in from the oil inlet and drained from the oil discharge hole. When the oil drainage pressure is higher than a set value, surplus oil will release to the oil-in chamber through the pressure limiting valve and the inside-release oil channel. Compared with the prior art, the circular inside-release oil pump is large in output volume of unit volume, simple in structure, high in volumetric efficiency, reliable and stable in performance and long in service life.

Description

technical field [0001] The invention relates to the field of automobile internal combustion engines, in particular to an island-type internal drain oil pump. Background technique [0002] In the existing internal drain oil pump, a square hole is arranged on one side of the middle section of the pressure limiting hole and communicates with the internal drain oil passage, and oil discharge and oil discharge are realized through the square hole. The advantages of this type of internal drain oil pump are large displacement per unit volume, high volumetric efficiency and compact structure. However, it has the following defects: the pressure limiting valve is easily pushed to the side of the inner oil discharge channel excessively by the spring and the oil, and the oil discharge square hole is quickly worn and deformed, causing the pressure limiting valve to be stuck during the opening and closing process, and the leakage The oil pressure limiting function is therefore ineffectiv...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defects of the prior art, the present invention provides an island-type internal drain oil pump. This device ensures large displacement per unit volume, high volumetric efficiency, and simple structure, and at the same time solves the problem of the pressure limiting valve of the existing internal drain oil pump. Stuck defects, to achieve reliable and stable performance, long service life

Images