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Hydraulic transmission system controlled by electro-hydraulic proportional valve

An electro-hydraulic proportional valve and hydraulic transmission technology, which is applied to fluid pressure actuation system components, fluid pressure actuation devices, lifting devices, etc., can solve problems such as impact wear and limited cushioning effect of gearbox clutches, and reduce the failure rate , Structural hardware structure is simple and compact, and the effect of high reliability

Pending Publication Date: 2022-03-25
采埃孚合力传动技术(合肥)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the unavoidable shifting impact of the transmission mechanical structure or electromagnetic switch valve control in the process of shifting or cutting into gears, the cushioning effect on the transmission clutch is limited, and it is also limited by the driver's operating experience. Condition of wear and tear

Method used

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  • Hydraulic transmission system controlled by electro-hydraulic proportional valve
  • Hydraulic transmission system controlled by electro-hydraulic proportional valve
  • Hydraulic transmission system controlled by electro-hydraulic proportional valve

Examples

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Embodiment 1

[0025] Such as Figure 1-2 As shown, a hydraulic transmission system controlled by an electro-hydraulic proportional valve in this embodiment, the transmission system includes a coarse oil filter 1, an oil supply pump 2, an electro-hydraulic proportional valve I3, an electro-hydraulic proportional valve II4, a reverse clutch 5, Forward gear clutch 6, transmission controller TCU7, torque converter 8, safety valve 9, main pressure regulating valve 10, fine filter 11, fine oil filter bypass valve 12, radiator 13, pressure switch 14;

[0026] Described transmission system operation comprises the steps:

[0027] The oil in the oil pan enters the inlet of the oil supply pump 2 after passing through the coarse oil filter 1;

[0028] After being pressurized by the operation of the oil supply pump 2, it is filtered by the fine filter 11; and then the oil pressure is further stabilized and controlled through the pressure regulation of the main pressure regulating valve 10;

[0029] A ...

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Abstract

The invention provides a hydraulic transmission system controlled by an electro-hydraulic proportional valve. In the operation process of the transmission system, oil in an oil pan passes through a coarse oil filter and then enters an inlet of an oil supply pump; after being pressurized through operation of the oil supply pump, the oil is filtered by the fine filter; when the pressure difference before and after the fine filter is blocked reaches a preset value, the pressure switch transmits a corresponding alarm signal to a transmission control unit (TCU) to remind checking and replacement of the fine filter, and a part of oil passing through the fine filter enters an electro-hydraulic proportional valve I and / or an electro-hydraulic proportional valve II to supply oil to a valve body. The gearbox controller TCU is used for controlling the oil pressure of the middle oil duct and the oil quantity returned to the oil tank from the uppermost oil duct for the electro-hydraulic proportional valve I and / or the electro-hydraulic proportional valve II; and the other part of the oil passing through the fine filter enters the torque converter after being subjected to pressure regulation through the safety valve and then flows back to an oil pan of the gearbox. According to the invention, the gearbox controller is combined with the functions of gear, reversing and micro-motion, so that the process is smoother.

Description

technical field [0001] The invention relates to the technical field of forklift hydraulic gearboxes, in particular to a hydraulic transmission system controlled by a proportional valve of the forklift hydraulic gearbox, which is especially suitable for flexible power shifting of the forklift gearbox. Background technique [0002] Forklift hydraulic transmissions require frequent shifting and reversing operations during actual work. In some operating situations, it is necessary to realize inching functions. Traditional hydraulic transmissions usually use mechanical switch valves or several-position and several-way switches. The electromagnetic switch valve realizes the operation of shifting and reversing, and an additional micro-motion valve is required to realize the micro-motion function. Due to the unavoidable shifting impact of the transmission mechanical structure or electromagnetic switch valve control in the process of shifting or cutting into gears, the cushioning eff...

Claims

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Application Information

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IPC IPC(8): F15B11/08F15B13/02F15B21/041B66F9/22
CPCF15B11/08F15B13/02F15B21/041B66F9/22
Inventor 孙建国王永国王战吴琳琪王捷
Owner 采埃孚合力传动技术(合肥)有限公司
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