Sequentially controlled twin steering pump

Abstract

The invention discloses a sequentially controlled twin steering pump, which comprises a main pump, an auxiliary pump, an intermediate and a pump shaft. The main pump includes a flow control valve I, a safety valve I, a flow control damping hole I, a pressure control damping hole, a check valve I, a pump body, a pressure side plate I, a blade I, a rotor I, a stator I, and a flow control valve spring. The auxiliary pump consists of a safety valve II, a reversing valve, a check valve II, a flow control damping hole II, a blade II, a rotor II, a stator II, a pressure side plate II, a pump cover I, and a reversing valve spring. An annular oil suction chamber of the main pump is communicated with an oil inlet and is also communicated with an annular oil suction chamber of the auxiliary pump through an intermediate oil suction window, so that the oil inlet can deliver an oil medium simultaneously to the main pump and the auxiliary pump. The pump of the invention improves steering security, prolongs service life, reduces energy consumption, enhances reliability and lowers steering oil medium consumption. In the pump of the invention, even if the main pump breaks down, the auxiliary pump can substitute automatically, and realizes the function of emergency oil supply.

Description

technical field [0001] The invention relates to a vane type automobile steering oil pump, in particular to a dual steering pump capable of sequential switching control. Background technique [0002] In response to the requirements of FAW Technology Center, Dongfeng Motor Technology Center, Jinan Heavy Duty Truck Technology Center, Beiben Technology Center, and Shaanxi Automobile Technology Center, the application concept of the steering pump equipped with its heavy trucks was redefined, and the steering pump was required to be provided in addition to the normal supply. In addition to steering hydraulic oil, it can also play the role of emergency oil supply. At the same time, further improvements and technical upgrades are required in terms of geometric displacement, pressure resistance, temperature rise reduction, and especially power consumption. [0003] For heavy trucks and large passenger cars, the steering pump is the core component of the hydraulic power steering syste...

AI Technical Summary

Problems solved by technology

[0003] For heavy trucks and large passenger cars, the steering pump is the core component of the hydraulic power steering system and is also a safety component of the vehicle. The steering pump currently equipped does not have an emergency function, and the general failure rate is high and the service life is short. Greatly affects the safety and reliability of the vehicle steering system

Domestic large-tonnage vehicles run on poor road conditions and are seriously overloaded. Steering pumps at the current technical level are difficult to adapt to the current conditions of use of such vehicles. Even the world's top-level steering pumps still have about 3%-5% of faults rate, when a fault occurs, the power steering function fails, making the vehicle in an extremely dangerous situation

At the current domestic and foreign technical level, for small-displacement steering pumps, high-pressure resistance can be better achieved, but it is difficult to achieve a single pump with large displacement and high-pressure resistance required by heavy trucks. Even if a large displacement is achieved, Its ability to withstand high pressure is poor, its service life is extremely short, and the failure rate will further increase

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