Small-tonnage forklift gearbox hydraulic control system

Abstract

The small-tonnage forklift gearbox hydraulic control system comprises an oil tank, a coarse oil filter is embedded in the oil tank, an oil supply pump is arranged outside the oil tank, and an output port of the coarse oil filter is connected with an input port of the oil supply pump. When the fine oil filter is blocked through the whole control system, the alarm system can be stimulated to remind an operator of timely maintenance; according to the whole control system, when the fine oil filter is blocked, oil supply of the backward clutch and the forward clutch is cut off under the condition that oil supply of the torque converter is guaranteed, the abrasion degree and the ablation degree of friction plates are reduced to the minimum, and the economic loss and the operation risk of the whole vehicle are also reduced; the installation position of the fine oil filter can also detect the total flow of the oil supply pump, the leakage condition of the oil supply pump can be detected, and whether the leakage condition of the whole control system meets the heat dissipation and lubrication requirements or not can be measured by comparing the flow at the outlet of the torque converter.

Description

technical field [0001] The invention belongs to the technical field of control of hydraulic components of a hydraulic gearbox, in particular to a hydraulic control system of a small-tonnage forklift gearbox. Background technique [0002] Small tonnage forklift hydraulic transmission is equipped with main pressure regulating valve, micro valve, buffer valve and electromagnetic reversing valve (hereinafter referred to as "reversing valve"), etc. The principle is that the transmission oil enters the oil supply pump through the coarse oil filter After being pressurized by the oil supply pump, one path enters the relief valve of the fine oil filter (hereinafter referred to as "relief valve"), and the other path enters the fine oil filter, and then enters the main pressure regulating valve and the micro-motion valve respectively. , the transmission oil passing through the inching valve will pass through the reversing valve, and the transmission oil passing through the reversing va...

AI Technical Summary

Problems solved by technology

[0003] The traditional control system design cannot control the oil volume and pressure in the torque converter chamber when the fine filter is seriously blocked, and at the same time block the transmission oil to the clutch

Continued "make do" use can cause serious damage to the torque converter and clutch

At the same time, the traditional control system design cannot accurately detect the leakage of the system. In this way, when the test bench is off-line, although the verification can be passed in a short time, there are great hidden dangers in the later use, and it will soon be Symptoms of system failure

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