Dual-intermediate-shaft gearbox

Abstract

The invention provides a dual-intermediate-shaft gearbox of which a main shaft front end is axially positioned. The dual-intermediate-shaft gearbox comprises a supporting clapboard, a rear shell, an input shaft, a main shaft, a planet wheel and a planet carrier, wherein the rear end of the input shaft is connected with the front end of the main shaft in a loose sleeving manner; the input shaft restrains the axial degree of freedom of the main shaft; and the rear end of the main shaft is radially positioned on the supporting clapboard. The rear end of the input shaft is sleeved inside an end hole at the front end of the main shaft in a loose manner, and a restraining member for realizing the relative axial restraining between the input shaft and the main shaft is arranged between the rear end of the input shaft and the inner wall of the end hole at the front end of the main shaft. A first thrust bearing, a bearing race, a second thrust bearing and a stopping member are axially superposed at the rear end of the input shaft in sequence, the first thrust bearing and the bearing race are used for bearing the axial force of the main shaft towards the input shaft, the second thrust bearing is used for bearing the axial force, deviating from input shaft, of the main shaft, and the stopping member is used for tightly pressing and limiting the firs thrust bearing, the bearing race and the second thrust bearing, the restraining member is arranged between the bearing race and the inner wall of the end hole at the front end of the main shaft, and a radial clearance for the floating of the main shaft is reserved between the bearing race and the input shaft.

Description

technical field [0001] The invention relates to a double countershaft gearbox, in particular to a 10-speed double countershaft gearbox, and more specifically to a 10-speed double countershaft gearbox whose main box adopts helical gear transmission. Background technique [0002] The existing heavy-duty truck gearbox basically adopts the combined design of the main and auxiliary boxes. The auxiliary box adopts a planetary gear train structure. Only one end of the planetary gear train is positioned on the rear shell through the planet carrier and bearings. There is a problem of unbalanced support, which affects the auxiliary gear. box life. [0003] Due to the double countershaft structure has the advantages of high torque transmission and long service life, this structure is widely used in the main box of heavy-duty truck gearbox. The double countershaft structure is to ensure that the two countershaft gears mesh with the main shaft gear at the same time, requiring the high c...

AI Technical Summary

Problems solved by technology

Compared with helical gears, straight teeth have the disadvantages of high noise and low load capacity. How to apply helical gears to existing gearboxes is an urgent problem to be solved

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