Automobile engine oil pump

Abstract

The invention provides an automobile engine oil pump which comprises a pump bonnet and a pump body, wherein a high-pressure oil cavity and a low-pressure oil cavity are arranged in the pump body; the pump bonnet is provided with a dual-purpose valve; the dual-purpose valve comprises a valve body; an oil return cavity, a valve cavity and a valve core are arranged in the valve body; the oil return cavity is positioned at the upper part of the valve cavity; the valve core is installed in the valve cavity and isolates the oil return cavity from the valve cavity; the valve cavity is communicated with the high-pressure oil cavity; the valve core is provided with a first end face and a second end face; the first end face is contacted with the oil return cavity and bears the downward acting forceof the oil in the oil return cavity; the second end face is contacted with the valve cavity and bears the downward acting force of the oil in the valve cavity; the area of the first end face is smaller than that of the second end face; and the position on which the dual-purpose valve is arranged on the pump bonnet is provided with a pressure relief port which is communicated with a low-pressure oil cavity. The oil pump can relieve pressure at the time of cold starting of an engine and can also steadily relieve pressure when the engine normally operates, so that the arrangement space of the oil pump is small.

Description

technical field [0001] The invention relates to an automobile engine oil pump, which belongs to the technical field of automobile engine lubricating systems. Background technique [0002] At present, the valves of traditional oil pumps used for automobile engines include pressure limiting valves and safety valves. Some engine oil pumps only have pressure limiting valves, some only have safety valves, and some oil pumps have two valves. If only the pressure limiting valve is too high when the engine starts cold, it is not conducive to the good pressure relief of the engine and may cause destructive oil pressure. If there is only a safety valve, it will affect the pressure relief during normal operation of the engine. If there are two valves at the same time, the space arrangement of the oil pump will be too large, and the quality of the entire oil pump will also increase. Contents of the invention [0003] The technical problem to be solved by the present invention is to p...

AI Technical Summary

Problems solved by technology

If only the pressure limiting valve is too high when the engine starts cold, it is not conducive to the good pressure relief of the engine and may cause destructive oil pressure. If there is only a safety valve, it will affect the pressure relief of the engine during normal operation.

If there are two valves at the same time, the space of the oil pump will be too large, and the mass of the entire oil pump will also increase

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