A forklift hydraulic gearbox case

Abstract

The invention relates to a fork truck hydrodynamic gearbox body comprising a gearbox body, wherein the top surface of the gearbox body is provided with a window and serves as a control valve mounting surface; one end surface adjacent to the top surface serves as a torque converter housing mounting surface; a first horizontal oil passage hole, a vertical oil passage hole, a second horizontal oil passage hole and a stepped hole are formed in the gearbox body in positions below the torque converter housing mounting surface; a tube-type filter element is arranged in the stepped hole; an end cover is arranged at the outer end opening of the second horizontal oil passage hole and the stepped hole; a groove is formed in the end cover; oil filtering and conveying functions are achieved through the tube-type filter element, the stepped hole, the second horizontal oil passage hole and the groove of the end cover; after the tube-type filter element sucks oil, hydraulic oil is discharged into the second horizontal oil passage hole through the stepped hole and the groove of the end cover and then discharged out through the vertical oil passage hole and the first horizontal oil passage hole. The fork truck hydrodynamic gearbox body shortens an oil suction pipeline, improves the oil suction efficiency of the hydrodynamic oil feed pump of a transmission system, facilitates the replacement and maintenance of the tube-type filter element on the gearbox body, reduces failure rate and prolongs the service life of the transmission system.

Description

technical field [0001] The invention belongs to the technical field of gearbox hydraulic transmission of transport vehicles, and in particular relates to a box body of a forklift hydraulic gearbox. Background technique [0002] At present, the domestic forklift transmission system mostly adopts hydraulic transmission, and the hydraulic oil circuit of the system is mostly integrated inside the gearbox housing, and the hydraulic clutch is used as the shift actuator. The hydraulic transmission device used in the H series 1-3.5t hydraulic transmission forklift is composed of a hydraulic torque converter and a power shift gearbox with a front gear and a rear gear. The hydraulic torque converter enables the hydraulic transmission box to have automatic adaptability to the output of the hydraulic transmission, which can change its output torque and speed correspondingly as the load changes, and can absorb and eliminate the impact on the transmission system from the engine and extern...

AI Technical Summary

Problems solved by technology

For regular maintenance and maintenance, it is necessary to disassemble the powertrain from the whole machine, then separate the transmission device from the engine, and finally disassemble the transmission device to replace the oil filter. This process takes a long time , many disassembly and installation procedures

Conversely, if regular maintenance and maintenance are not performed, the blockage of the filter element will cause the pump efficiency to decrease, the transmission efficiency will decrease, the system pressure will not reach the set value, the hydraulic clutch will not work normally, and the increase in the system oil temperature will cause the life of the transmission system to decrease. The expected performance of the control valve cannot be guaranteed; if the filter element is damaged and cannot be replaced in time, iron filings and impurities will cause the valve core of the control valve to be stuck, the transmission parts will be severely worn, and the friction plate will be ablated.

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