Autonomous-heat-exchange parallel-connection closed type forklift static-pressure drive system

Abstract

An autonomous-heat-exchange parallel-connection closed type forklift static-pressure drive system comprises an engine, a variable displacement piston pump, a heat exchange valve, a speed change valve, a parking control valve, a hydraulic motor, a parking hydraulic cylinder, an oil inlet filter net, an oil return heat dissipation device and an oil return filter. Power of the static-pressure drive system is provided by the engine, the engine is connected with the variable displacement piston pump through a transmission shaft, the variable displacement piston pump is in a double-outlet inclined disc type, input rotation speed through an adjusting pump and the position and angle of the inclined disc, output flow of the variable displacement piston pump is adjusted, and opening and closing of the variable displacement piston pump are achieved. Two pressure oil openings of the variable displacement piston pump are connected with the hydraulic motor and the heat exchange valve in parallel. The autonomous-heat-exchange parallel-connection closed type forklift static-pressure drive system has the advantages that a low-speed large-torque wheel motor is used for directly driving wheels, additional torque loss caused by mechanical speed reduction is avoided, the structure is simple, transmission efficiency is high, power loss is little, improvement of energy utilizing efficiency is facilitated, and the dynamic property is superior.

Description

technical field [0001] The invention relates to the technical field of static pressure transmission, in particular to a static pressure driving system of an independent heat exchange parallel closed forklift. Background technique [0002] At present, the application of hydrostatic drive technology in construction machinery such as excavators and loaders is relatively mature and common. Forklift products have high requirements for low-speed performance due to special working conditions, and it is impossible to simply copy the static pressure drive system of loaders and excavators. . The domestic market for high-end forklifts is still in the process of being cultivated, and the sales scale has not been formed. As a result, the research and practical application of static pressure driven forklifts have not been really carried out. The driving parts of the domestic counterbalanced forklifts sold on the market are driven by engines. The clutch or torque converter transmits power...

AI Technical Summary

Problems solved by technology

[0002] At present, the application of hydrostatic drive technology in construction machinery such as excavators and loaders is relatively mature and common. Forklift products have high requirements for low-speed performance due to special working conditions, and it is impossible to simply copy the static pressure drive system of loaders and excavators.

The domestic market for high-end forklifts is still in the process of being cultivated, and the sales scale has not been formed. As a result, the research and practical application of static pressure driven forklifts have not been really carried out. The driving parts of the domestic counterbalanced forklifts sold on the market are driven by engines. The clutch or torque converter transmits power to the gearbox, and then to the half shaft through the final drive and differential to drive the wheels to rotate

This kind of mechanical transmission system has the disadvantages of complex structure, fixed speed ratio, high price, frequent failure and low efficiency.

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