Bearing for fluid pump

Abstract

The invention provides a bearing for a fluid pump. When the fluid pump works, a positive pressure region (28) for pumping fluid and a negative pressure region (27) for allowing the fluid to flow intoare formed in the fluid pump, a fluid supply groove (253) extending in the axial direction and a fluid backflow groove (254) are formed in the hole wall of a shaft hole (26) of the bearing (25) correspondingly, wherein the fluid supply groove (253) communicates with the positive pressure region (28), the fluid backflow groove (254) communicates with the negative pressure region (27), and the fluidsupply groove (253) is in a blind groove shape. According to the bearing, the holding force of an oil seal can be reduced, or the oil seal can be directly omitted, so that the manufacturing cost of an oil pump is reduced.

Description

technical field [0001] The present invention relates to a fluid pump, in particular to a bearing for a fluid pump. Background technique [0002] When a fluid pump, such as an oil pump, is working, the inner rotor of the oil pump rotates at high speed. In order to reduce the friction between the rotating shaft and the shaft hole wall of the pump body, that is, the sliding bearing, the contact parts must be lubricated. [0003] Chinese Patent Application Publication CN105298837A discloses a technical solution for lubricating a sliding bearing, which realizes lubricating the sliding bearing by forming an oil passage. [0004] However, although the above technical solution achieves the lubrication of the sliding bearing with a relatively simple structure and relatively low cost, in order to prevent the lubricating oil from flowing out of the pump along the motor shaft, a sealing member needs to be provided between the pump housing and the motor shaft , and in order to ensure a ...

AI Technical Summary

Problems solved by technology

[0004] However, although the above technical solution achieves the lubrication of the sliding bearing with a relatively simple structure and relatively low cost, in order to prevent the lubricating oil from flowing out of the pump along the motor shaft, a sealing member needs to be provided between the pump housing and the motor shaft , and in order to ensure a good sealing performance, it is required to have a certain grip between the motor shaft and the sealing member. On the one hand, this increases the starting torque of the oil pump, which leads to an increase in the failure rate of starting, an increase in the loss of the oil pump, and a decrease in efficiency. ; On the other hand, more wear-resistant materials must be used for sealing components, resulting in an increase in raw material costs

The above problems will eventually lead to a reduction in the market competitiveness of the product

Images