Power steering pump

Abstract

The invention discloses a power steering pump. The power steering pump is characterized in that a pump shaft is connected in series with a front oil distribution disc, a blade assembly and a front oil distribution disc into a whole so as to be installed in a pump body cavity, the front oil distribution disc and a front wall of the pump body cavity form an oil-out front cavity in an enclosed mode, and a pump body is provided with a valve hole on the side of an outer circle of the pump body cavity; the valve hole is communicated with the oil-out front cavity, the valve hole is internally provided with a flow safety control valve, and the oil-out front cavity is communicated with an oil outlet at the front of the pump body through a high-pressure oil channel; the outer circle of the blade assembly and an inner wall of the pump body cavity form a pump body back cavity in an enclosed mode, and the valve hole is communicated with the pump body back cavity through a return oil channel; and blades are driven by the pump shaft to rotate so as to finish an oil absorption and draining process, and the flow safety control valve controls oil mass discharged from the oil-out front cavity through the oil outlet to keep constant. The power steering pump provided by the invention has the advantage of shortening a high-pressure oil flow channel with smoothness in transition, reducing flow pressure loss, and avoiding that the power steering pump is failed due to serious heating because the flow channel in the traditional structure is long and bent by adopting a high pressure structure of the pump body front cavity.

Description

technical field [0001] The invention relates to an automobile hydraulic power steering assist pump, in particular to an automobile hydraulic power steering assist pump capable of reducing the temperature of the automobile steering system. Background technique [0002] In recent years, with the rapid development of my country's national economy and the automobile industry, the demand for heavy-duty, mining and engineering vehicles with double front axle structures of large tonnage is increasing. The torque increases correspondingly, which requires increasing the bore of the steering gear, and the required flow of the steering pump increases. At the same time, the booster cylinder is added to the double front axle vehicle, which also needs to increase a certain flow. The flow is large, and correspondingly, the temperature of the steering system is relatively high. In view of the current working conditions of domestic engineering vehicles, such as serious overloading, bad road ...

AI Technical Summary

Problems solved by technology

[0004] (1) attached figure 2 In the medium-density section line display part, the three holes of the high-pressure oil flow channel need to be processed, and the processing process increases the cost, and the passage is not smooth, which affects the smooth operation of the high-pressure oil;

[0005] (2) If the flow channel is long, there will be a loss in flow pressure. On the one hand, it cannot work in a normal state, and the direction cannot be moved or the steering is heavy. On the other hand, if the flow pressure does not reach the required value, the stability of the steering system will be affected. and life expectancy will be reduced;

[0006] (3) The flow channel is long and complicated, which will cause the temperature of the oil to rise too fast, and the temperature of the entire system will be high (the oil temperature of engineering vehicles and mine vehicles can reach 100 ° C ~ 160 ° C), which will accelerate the aging of the seals. It is easy to cause oil leakage. Excessive oil temperature may also lead to a sharp decrease in the kinematic viscosity of the oil, and the wear of the internal parts of the steering system will increase, resulting in a greatly reduced service life of the entire steering system.

When overflowing at low speed, its opening is small, resulting in high overflow speed, easy to cause heat generation, and rapid oil temperature rise. At high temperature, the internal parts of the steering pump are easy to wear and reduce the service life of the steering pump.

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