Gear case

Abstract

The invention discloses a gear case of a railway large-type track maintenance machine. The gear case comprises a case body, a driving gear shaft, a driven gear, an intermediate gear shaft, an axle gear, a gearshift and a locking mechanism, wherein the driven gear is fixedly arranged on the intermediate gear shaft; the driven gear is normally engaged with the driving gear shaft; the gearshift comprises a shifting driving cylinder; the shifting driving cylinder is fixedly connected onto the case body; the gearshift also comprises a push rod, a connection block and a rotation rack; the push rod is located in the case body, and does reciprocating sliding relative to the case body; a piston rod of the shifting driving cylinder is connected with one end of the push rod; the other end of the push rod is hinged to the connection block; the connection block is hinged to the rotation rack; the rotation rack is sheathed outside the driving gear shaft, and swings around the driving gear shaft; both ends of the intermediate gear shaft are respectively and rotatably supported to the rotation rack; the intermediate gear shaft and the axle gear are engaged or separated; the locking mechanism is provided with locating pieces and stroke blocks, wherein the locating pieces are arranged on the case body, and the stroke blocks are arranged corresponding to the locating pieces on the rotation rack.

Description

technical field [0001] The invention relates to a gear transmission mechanism of a large-scale railway maintenance machine, in particular to a hydraulically driven gear box. Background technique [0002] According to the requirements of different working conditions, the gear box realizes gear conversion through the gear shifting mechanism. In order to prevent accidental movement of the gear position, a gear locking mechanism is provided. There are two ways of shifting and locking mechanism of the existing hydraulically driven gearbox: one is the 08-32 type tamping vehicle auxiliary drive axle gearbox introduced from Plasser﹠Theurer company, which shifts gears by means of toggle gears , it uses the cylinder to push the shift fork, and the shift fork drives the gear to move on the spline shaft to realize the gear shift. Due to the small gear meshing backlash, it is difficult for the driving gear to be inserted into the driven gear accurately when shifting gears. Inconvenient;...

AI Technical Summary

Problems solved by technology

There are two ways of shifting and locking mechanism of the existing hydraulically driven gearbox: one is the 08-32 type tamping vehicle auxiliary drive axle gearbox introduced from Plasser﹠Theurer company, which shifts gears by means of toggle gears , it uses the cylinder to push the shift fork, and the shift fork drives the gear to move on the spline shaft to realize the gear shift. Because the gear meshing backlash is small, it is difficult for the driving gear to be inserted into the driven gear accurately when shifting gears. Inconvenient; the locking mechanism uses springs and steel balls to lock, and the locking reliability is not high, especially when the vehicle is running with a large vibration or the spring stiffness is not enough, it is very easy to accidentally move the gear position, that is, the phenomenon of disengagement occurs. Damaged gears; the other is the PGM-48 type rail grinding car axle gearbox introduced from the American Jackson company, which shifts gears by flipping the meshing sleeve, because the thin-walled meshing sleeve with internal and external splines The gear shaft with external splines and the gear with internal splines are used for gear conversion, and the gears are locked by using the inverted bevel teeth of the meshing sleeve. The manufacturing of the meshing sleeve is difficult, the gear locking is not reliable, and the gear shaft has many matching parts. , high processing requirements, difficult manufacturing, complex force, unreasonable structure

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