Lubricating pump, pump body and pump cover thereof

Abstract

The invention discloses a pump body of a lubricating pump, comprising a pump shaft support hole, a rotor cavity and a big end surface. The big end surface is used for mounting the pump cover and recesses inwards along the radial direction of the rotor cavity to form stepped-holes. The invention also discloses a pump cover of the lubricating pump, comprising the pump body and the pump cover. The pump cover is embedded into the stepped-holes and matched with the stepped-holes in transition. The invention also discloses a lubricating pump, comprising the pump body, the pump cover, an inner rotor, an outer rotor and a pump shaft. The edge of the pump cover is matched with the stepped-holes in transition and seals the rotor cavity, the pump shaft passes through the pump shaft support hole, theend part of the pump shaft extends into the support hole at the end part of the pump shaft, the pump shaft is also internally provided with an overflow circumfluence hole which extends from one end of the pump shaft far from the pump cover along the radial direction of the pump shaft, and the axial length of the overflow circumfluence hole is shorter than that of the pump shaft. The invention improves the locating accuracy and the locating strength of the pump cover, simplifies the assembling flow, improves the working efficiency, avoids the engine oil leakage phenomenon, and has simple and compact structure and easy implementation.

Description

technical field

[0001] The present invention relates to an engine oil pump body, an engine oil pump casing including the above engine oil pump body and an engine oil pump. Background technique

[0002] The oil pump is the core component of the diesel engine lubrication system. The single-cylinder diesel engine oil pumps produced in my country generally use the rotor-type oil pump, which is mainly composed of a pump body, a pump cover, an inner rotor, an outer rotor, a pump shaft, and positioning pins. The balance shaft in the diesel engine drives the pump shaft of the oil pump to rotate, and the rotation of the pump shaft causes the volume between the inner and outer rotor teeth to change cyclically, realizing the function of oil suction and oil discharge of the oil pump. Long-term practice has proved that the assembly quality of the oil pump directly affects the performance of the oil pump. Therefore, the technical quality requirements of the production workers of the oil...

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