Light large-flow oil pump

Abstract

The invention provides a light large-flow oil pump which comprises a pump body, a pump cover, an inner rotor, an outer rotor, a pressure-limiting valve, a drive shaft and a transmission gear, wherein the inner rotor and the outer rotor are positioned in a rotor cavity of the pump body; end surfaces of the inner rotor and the outer rotor are provided with weight-reducing holes; one end of the drive shaft is mounted on the transmission gear; the other end of the drive shaft penetrates through a shaft hole of the pump body for being mounted on the inner rotor; the pressure-limiting valve is an inner relief type pressure-limiting valve; the pump body and the pump cover are aluminum die-casting fittings; and the pump cover is mounted on the pump body through a bolt. According to the technical scheme, the inner and outer rotor type structures and the inner relief type pressure-limiting valve are adopted, so that the structure of the whole oil pump is relatively compact; the pump body and the pump cover are aluminum die-casting fittings, and the end surfaces of the inner rotor and the outer rotor are provided with weight-reducing holes, so that weight is reduced; and oil in the inner relief type pressure-limiting valve can be returned into an oil inlet of the oil pump to supplement oil inlet amount, so that flow fluctuation of the oil outlet is reduced.

Description

technical field [0001] The invention relates to an engine oil pump, in particular to a large-flow engine oil pump used on a diesel generator. Background technique [0002] The minimum flow requirement of the diesel engine for the oil pump is 180L / min. The common large flow pump adopts a gear structure, including cast iron pump body, pump cover, gear, and external pressure limiting valve. Although this structure can meet the performance requirements of the engine and has a simple design, it has disadvantages such as "uncompact structure, heavy weight, high energy consumption, and large flow fluctuations before and after the pressure limiting valve is opened". In order to meet the oil flow rate, the diameter and thickness of the gear must be increased, resulting in an increase in the volume of the entire pump body. If the diameter or thickness of the gear is not increased, in order to obtain a larger flow capacity, the speed of the oil pump can only be increased, but This sit...

AI Technical Summary

Problems solved by technology

Although this structure can meet the performance requirements of the engine and has a simple design, it has disadvantages such as "uncompact structure, heavy weight, high energy consumption, and large flow fluctuations before and after the pressure limiting valve is opened".

In order to meet the oil flow rate, the diameter and thickness of the gear must be increased, resulting in an increase in the volume of the entire pump body. If the diameter or thickness of the gear is not increased, in order to obtain a larger flow capacity, the speed of the oil pump can only be increased, but This situation will reduce the service life of the oil pump, increase the power consumption of the accessories of the oil pump or affect the fuel economy of the engine, and the noise of the engine will also increase

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