Variable speed pump design of loader

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In the construction of roads, especially in the construction of high-grade highways, loaders are used for filling and digging of roadbed engineering, aggregate and loading of asphalt mixtures and cement concrete yards. In addition, it can also be used to push soil, scrape the ground and pull other machinery.

The main components of the loader include engine, torque converter, gearbox, front and rear drive axle, referred to as the four major parts.

There are three pumps on the loader torque converter, working pump (supply lifting, tipping bucket pressure oil), steering pump (supply steering pressure oil), variable speed pump, also known as walking pump (supply torque converter, transmission pressure oil), some models of steering pump is also equipped with pilot pump (supply pilot pressure oil control valve).

variable speed pump is a kind of oil pump installed on the loader gearbox, which provides gear pressure oil and pitch variable oil for the gearbox. After long-term use, the gear inside the loader variable speed pump will wear off the shell on the side of the variable speed pump, which will cause the seal gap inside the variable speed pump to become larger, and the oil discharged by the gear to the oil outlet will return from the wear place, reducing the pressure. The variable speed pump loses the use value and affects the use of the loader.

The working performance of the variable speed pump directly affects the working efficiency and reliability of the loader. Improving the structure of the variable speed pump can improve the release efficiency of the variable speed pump, improve the self-priming performance, reduce the running noise and extend the service life.

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