Gearbox

Abstract

The invention discloses a gearbox. The gearbox comprises a first shell, a second shell, a differential mechanism assembly, a gear shifting assembly, a torque converter assembly and a PTO assembly. Thetorque converter assembly comprises a hydraulic torque converter and a turbine shaft. The PTO assembly comprises a first shaft sleeve, an intermediate shaft and a PTO shaft; the intermediate shaft issleeved with an intermediate gear; the PTO shaft is sleeved with an oil pump driven gear, an oil pump driving gear, an internal meshing oil pump and an oil pump end cover; a first through hole is formed in the PTO shaft in the axis direction of the PTO shaft; the first shaft sleeve is fixedly connected with the second shell; the turbine shaft is sleeved with the first shaft sleeve, one end of thefirst shaft sleeve is located in a pump hub, the intermediate gear is meshed with the oil pump driven gear and the first gear, and the intermediate shaft is fixedly connected with the second shell; the PTO shaft is arranged in the second shell, the internal meshing oil pump is meshed with the oil pump driving gear, the internal meshing oil pump and the oil pump end cover are fixedly connected with the second shell, an internal spline is arranged at the end, close to the oil pump end cover, of the first through hole and serves as a PTO connector, and the PTO connector is used for mounting an external oil pump.

Description

technical field [0001] The invention relates to the technical field of forklifts, in particular to a gearbox. Background technique [0002] Due to the smooth and comfortable characteristics of hydraulic drive, hydraulic drive has been more and more widely used in various types of machinery. [0003] Since the pressure of most mechanical hydraulic systems comes from the hydraulic pump, the driving mode of the hydraulic pump is divided into two modes: direct engine drive and vehicle pulley transmission. In small-tonnage forklifts, the direct drive of diesel engines is more widely used, so it is necessary to design a PTO output interface for driving hydraulic pumps on the diesel engine of small-tonnage forklifts to realize PTO power transmission. [0004] Therefore, the Chinese patent document with the publication number CN200978935Y discloses a forklift hydraulic transmission gearbox with a power take-off port (ie, a PTO interface) that has a larger crude oil filter area and ...

AI Technical Summary

Problems solved by technology

[0007] 2) Due to the box structure of the gearbox and the PTO transmission structure, during the assembly process of the box of the gearbox, the installation direction of the screws cannot be guaranteed to be consistent, so the assembly reference of the entire gearbox cannot be unified, and the assembled transmission The matching accuracy and installation accuracy of the box cannot be guaranteed, which seriously affects the efficiency of the PTO transmission structure;

[0008] 3) In the installation structure of the external oil pump, that is, the structure of the PTO interface, the internal meshing oil pump is located on the outside, which may easily lead to unstable PTO interface, difficult assembly, and high assembly cost

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