Mechanical three-shaft type high-speed-ratio automobile gearbox

Abstract

The invention discloses a mechanical three-shaft type high-speed-ratio automobile gearbox which comprises an input shaft, an output shaft, an intermediate shaft and transmission gears arranged on the shafts. Due to the fact that each stage of transmission gear of the gearbox is a point-line gear, running of the gearbox can be more stable, the working noise of the gearbox can be reduced, and the service life of the gearbox can be prolonged; due to the fact that the point-line gears are large short-addendum gears, the large gear ratio can be achieved, and through the design of the limit of the gear ratios of the transmission gears, the maximum transmission ratio of the first gear of the gearbox can reach above twelve, the maximization of the transmission ratio of the first gear of the gearbox is achieved, the transportation requirement for steep slope overloading of automobiles is met, an auxiliary gearbox does not need to be added in front of or in back of the gearbox, the manufacturing cost of the gearbox of a heavy-load automobile is reduced, the failure rate of the gearbox is reduced, and the reliability of the gearbox is improved; in addition, the transmission structure of the gearbox does not need to be changed, so the gear shifting operation can be more convenient and flexible.

Description

technical field

[0001] The invention relates to a speed change transmission device of an automobile, in particular to a gearbox for a heavy-duty automobile.

[0002] Background technique

[0003] In the prior art, a mechanical three-shaft automobile gearbox is composed of an input shaft, an output shaft, an intermediate shaft and gears arranged on the shaft. Among them, the input shaft is provided with a transmission gear that can rotate synchronously with it, and the intermediate shaft is provided with There is an intermediate shaft constant meshing gear that can rotate synchronously with it, and the intermediate shaft constant meshing gear meshes with the transmission gear on the input shaft to form a one-stage reduction transmission; the intermediate shaft and the output shaft are correspondingly equipped with multiple sets of gears that mesh with each other , the gear gear on the intermediate shaft is installed on the intermediate shaft with a key or interference fit an...

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