A direct-acting overflow valve of the oil supply system of transmission device

Abstract

The invention discloses a direct acting type overflow valve of an oil supply system of a transmission device. The overflow valve comprises a valve body, a valve core, a pressure adjusting spring set, a pressure adjusting rod, a T-shaped guide rod and a hand wheel. The pressure adjusting spring set coats the T-shaped guide rod, and consists of two springs with different rigidities and lengths; the rigidity ratio range of the two springs is from 2: 1 to 4: 1; the length ratio range is from 1.2: 1 to 2: 1; and the two ends of the pressure adjusting spring set are respectively butted against the valve core and the T-shaped guide rod. The hand wheel can drive the valve core to rotate; through the rotation of the valve core, the opposite positions of a wedged groove in the right end of the valve core and a plane groove in the valve body are changed, the oil acting area is changed, the damping hole change effect is achieved, and the opening speed of the overflow valve is changed; and the overflow valve needs no other complex damping hole adjusting mechanisms, realizes the purposes of higher pressure fixing precision and smaller size. The pressure adjusting spring set adopts the double-spring setting to realize the purposes of stronger adaptability and higher reliability of the overflow valve.

Description

technical field [0001] The invention relates to a high-efficiency oil supply device for a hydraulic circuit of a transmission device of an engineering vehicle, in particular to a direct-acting overflow valve of the oil supply system of a transmission device to ensure high efficiency under low-pressure working conditions, high-pressure working conditions and complex and changeable working conditions. Rapid oil supply and stable oil pressure. Background technique [0002] In engineering vehicles, the transmission oil supply system is the core component of the vehicle. When the vehicle shifts and turns, the load of the shifting and steering circuit changes suddenly. At this time, the oil supply characteristics of the oil supply system determine the speed and accuracy of the entire vehicle's shifting and steering. The performance of the overflow valve plays a decisive role in the normal operation of the transmission oil supply system, which directly affects the accuracy, stabil...

AI Technical Summary

Problems solved by technology

[0003] According to the structural classification, there are two types of relief valves: direct-acting and pilot-operated. For the traditional direct-acting relief valve, when the pressure is high and the flow is large, the pressure regulating spring is required to have a large stiffness, and the adjustment performance is poor. , the hydraulic force at the outlet of the relief valve makes the constant pressure of the relief valve unstable, and the opening speed of the spool cannot be guaranteed

Due to the limitation of the valve body structure and spring performance, the constant pressure range, precision and speed of the traditional relief valve with this structure are limited, thus resulting in the defects of low application range and poor adaptability of the relief valve

[0004] At present, the oil supply system used on vehicles gives priority to the oil supply conditions of the shift steering circuit. Because the load of the shift steering circuit varies greatly and the pressure is relatively high, the general relief valve cannot meet the large load and sudden change of load of construction machinery. , when the oil pressure suddenly increases or decreases, the high-speed response is poor, the constant pressure is unstable, and the reliability of the constant pressure is low, and it cannot meet the high-speed, stable and precise constant pressure under high pressure, resulting in wear or even damage to the key components of the vehicle

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