Hydraulic power steering pump and steering system thereof

Abstract

The invention discloses a hydraulic power steering pump and a steering system thereof. An overflow valve is arranged in the steering pump, an overflow opening is formed in the wall of a cavity body of the steering pump at the position corresponding to the overflow valve, the overflow opening is communicated with an oil suction chamber in the steering pump through an oil passage in the steering pump, and the end opening of the overflow opening is connected with an overflow pipe which is used for being communicated with a steering oil tank. The steering system comprises a steering gear and the steering oil tank, wherein an oil return opening of the steering gear is connected with the steering oil tank through an oil return pipe. The steering system also comprises the hydraulic power steering pump, the steering oil tank is connected with an oil inlet of the steering pump through an oil suction pipe, an oil outlet of the steering pump is connected with the steering gear through a high-pressure oil pipe, and the overflow opening of the steering pump is connected with the steering oil tank through the overflow pipe. On the condition of high rotating speed, a part of overflowing hydraulic oil flows through the inner part of the steering pump to be directly applied to the next circulation, and the other part of the overflowing hydraulic oil flows back to the steering oil tank through an outer oil pipe to be again applied to the circulation, so that sufficient oil suction on the condition of high rotating speed is ensured, and the temperature rise is relatively small.

Description

technical field [0001] The invention relates to the technical field of vehicle steering, in particular to a hydraulic power steering pump and a steering system thereof. Background technique [0002] At present, there are mainly two different cycles in the hydraulic power steering system. No matter which cycle is used, there are certain deficiencies. The two cycles are: [0003] One is internal circulation, where the hydraulic oil overflowed by the internal circulation steering system returns directly to the large cavity of the steering pump to participate in the next cycle, which can avoid the problem of insufficient oil absorption and ensure stable system output. The flow rate increases sharply, most of the oil reciprocates in the steering pump, the power consumption is large, the temperature rise is large, the system stability is poor, and it is easy to damage; [0004] The other is external circulation. The hydraulic oil overflowed by the external circulation steering sy...

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Problems solved by technology

[0003] One is internal circulation, where the hydraulic oil overflowed by the internal circulation steering system returns directly to the large cavity of the steering pump to participate in the next cycle, which can avoid the problem of insufficient oil absorption and ensure stable system output. The flow rate increases sharply, most of the oil reciprocates in the steering pump, the power consumption is large, the temperature rise is large, the system stability is poor, and it is easy to damage;

[0004] The other is external circulation. The hydraulic oil overflowed by the external circulation steering system returns to the steering oil tank through the pipeline and participates in the system work again. This state is conducive to cooling the oil, and the temperature rise of the entire system is relatively small, which can prolong the reliability of the system. However, when the speed is high, the oil absorption capacity of the oil pump increases, which may easily cause insufficient oil absorption, or even inhale air, resulting in abnormal operation of the system and affecting driving experience and safety.

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