Travelling control valve of crawler-type hydraulic travelling system and travelling system

A travel control and travel system technology, which is applied to fluid pressure actuation devices, servo motors, servo meter circuits, etc. Effect

Pending Publication Date: 2019-08-16
徐州海伦哲特种车辆有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing crawler hydraulic travel system mostly adopts variable pump system and quantitative pump system. The disadvantages of variable pump system are high cost, large volume, and inconvenient maintenance.
[0006] Although the existing quantitative pump system is simple in structure and low in cost, its disadvantages are as follows: ① Since the control valves of the two motors are on-off valves, and a quantitative pump is connected at the same time, the flow rates flowing into the two motors are different due to different loads , resulting in low synchronous driving accuracy of the walking system; ②When steering is required, because the reversing valve in the two motor control valves is an on-off valve, the flow into the motor cannot be adjusted, which will make the "differential speed" driving unstable; ③It cannot achieve high , low-speed switching

Method used

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  • Travelling control valve of crawler-type hydraulic travelling system and travelling system
  • Travelling control valve of crawler-type hydraulic travelling system and travelling system

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Such as figure 2 As shown, a travel control valve of a crawler hydraulic travel system includes two reversing valves connected to the left travel motor 4 and the right travel motor 5 respectively, and the two reversing valves are three-position four-way electromagnetic proportional reversing valves. The valve also includes a diverter valve 32, a shuttle valve and a normally-off pressure compensator. The output oil circuit of the quantitative pump is divided into two paths through the diverter valve 32, and one path flows to the left through the first three-position four-way electromagnetic proportional reversing valve 33. Motor 4, the other way flows to the right travel motor 5 through the second three-position four-way electromagnetic proportional reversing valve 36; Between the port and the oil return port, the first shuttle valve ...

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Abstract

The invention discloses a travelling control valve of a crawler-type hydraulic travelling system and the travelling system. The travelling control valve comprises a flow dividing valve, shuttle valves, normal-off type pressure compensators and three-position four-way electromagnetic proportional reversing valves, wherein an quantitative pump output oil path is divided into two paths through the flow dividing valve, one path flows to a left travelling motor through the first three-position four-way electromagnetic proportional reversing valve, and the other path flows to a right travelling motor through the second three-position four-way electromagnetic proportional reversing valve; the pressure difference between the two ends of the first three-position four-way electromagnetic proportional reversing valve is determined by the first normal-off pressure compensator through the first shuttle valve; and the pressure difference between the two ends of the second three-position four-way electromagnetic proportional reversing valve is determined by the second normal-off pressure compensator through the second shuttle valve. According to the valve, the influence of two-side different loads on flow is effectively avoided, the synchronous precision of the motors on the two sides is improved, and differential driving is stabler and more flexible; the displacement of the two variable motors is controlled by the two-position three-way electromagnetic valves and pressure reducing valves correspondingly so as to achieve high-low-speed switching of vehicles.

Description

technical field [0001] The invention relates to a hydraulic travel system, in particular to a travel control valve and a travel system of a crawler-type hydraulic travel system, and belongs to the technical field of engineering machinery hydraulic control. Background technique [0002] Crawler-type walking system and tire-type walking system are the two most widely used walking systems in construction machinery. The crawler walking system has the following advantages: (1) The entire weight of the vehicle is the attached weight, so the traction adhesion performance is excellent; (2) Compared with the wheeled machinery of the same power, the crawler bearing surface is large and the grounding pressure is small. The sag depth on the top is small, so the rolling resistance is small, which is conducive to exerting a large traction force. [0003] Most of the crawler walking system adopts hydraulic transmission, because compared with mechanical transmission, hydraulic transmission...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/16F15B11/22
CPCF15B11/16F15B11/22F15B2211/20538F15B2211/4053
Inventor 董洪月胡景清陈永成张泽华陈时妹朱赛
Owner 徐州海伦哲特种车辆有限公司
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