Shifting stable combination valve of power shifting speed changer and shifting and pressure regulating system

Abstract

The invention discloses a shifting stable combination valve of a power shifting speed changer and a shifting and pressure regulating system. The shifting stable combination valve comprises an oil inlet, an oil outlet, a control opening, a hydraulic control type pressure reducing valve, an energy accumulator and a throttling hole, wherein the control opening is used for controlling a pressure regulating system; the hydraulic control type pressure reducing valve is connected between the oil inlet and the oil outlet in series; two ends of the throttling hole are respectively connected with a hydraulic control opening end of the hydraulic control type pressure reducing valve and the oil outlet; and the energy accumulator comprises a back cavity and a power cavity, the back cavity is connected to the hydraulic control opening end of the hydraulic control type pressure reducing valve, and the power cavity is connected with the control opening. The shifting and pressure regulating system comprises a main throttling hole, the shifting stable combination valve, a hydraulic control valve and a pressure reducing valve. According to the shifting stable combination valve provided by the invention, the structural design is compact, the oil pressure variation characteristic is reasonable, and the shifting stable combination valve has an important practical value for reducing the shifting impact of the power shifting speed changer, improving the working environment of a driver, reducing the labor intensity, prolonging the service life of a transmission system component, and the like.

Description

technical field [0001] The invention relates to the technical field of walking machinery transmission, and in particular to a shifting stability combination valve and a shifting pressure regulating system in the technical field of engineering machinery transmission. Background technique [0002] In the field of mobile machinery, especially construction machinery transmission technology, power shift transmissions have been widely used. The power shift transmission for construction machinery has the characteristics of simple operation, fast shifting, and shifting without stopping under working load. This kind of transmission realizes shifting by hydraulically operating the clutch (or brake) to engage and disengage. Due to the incompressibility of the liquid, the hydraulic transmission system has a relatively high rigidity. It will rise instantaneously, which will have the following adverse consequences: (1) The clutch is engaged roughly, resulting in shifting shocks, causing ...

AI Technical Summary

Problems solved by technology

The actual operating performance of the existing shift smooth coupling valve is not ideal. It often requires a large enough accumulator or a small orifice to cooperate to achieve the required smooth coupling time, and the oil pressure change law of the smooth coupling process is very important Buffer shift shock is not ideal

As a result, the existing shifting smooth combination valve often has the following problems: 1. The shifting impact is large; 2. The structure is complex and the size is large; 3. It is easy to cause fault phenomena such as throttle hole blockage and spring fatigue failure; 4. Parameter adjustment Difficult, not conducive to the generalization of products

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