Five-shift car gearbox

Abstract

The invention discloses a five-shift car gearbox. The five-shift car gearbox comprises a shell, a first shaft assembly, a second shaft assembly and an individual intermediate shaft assembly. The shell comprises a front gearbox shell body, a main gearbox box and a rear gearbox shell body. The first shaft assembly comprises a shaft gear. The second shaft assembly supported in an inner ring of a first shaft and the rear gearbox shell body comprises a third-shift gear, a second-shift gear, a first-shift gear, a backward gear and an overdrive gear of the second shaft, and the third-shift gear, the second-shift gear, the first-shift gear, the backward gear and the overdrive gear of the second shaft sequentially sleeve on the second shaft along the power transmission direction; the intermediate shaft horizontally arranged under the second shaft assembly comprises an intermediate shaft transmission gear constantly meshed with the gear of the first shaft, an intermediate backward gear constantly meshed with the backward gear of the second shaft through the intermediate backward gear and an intermediate gear correspondingly and constantly meshed with the third-shift gear and the second-shift gear of the second shaft; the intermediate backward gear is simultaneously and constantly meshed with the first-shift gear of the second shaft; the intermediate backward gear is axially fixed on the joint of the main gearbox box and the rear gearbox shell body.

Description

technical field [0001] The invention relates to the field of automobile transmissions, in particular to a five-speed automobile transmission. Background technique [0002] After 2005, the 2.5-ton class accounted for 45.2%-49.4% of the traditional business target market, becoming the largest ton-class platform in the light truck target market and relatively stable, corresponding to the engine torque range of 196-260Nm. In 2012, the sales volume of light truck transmissions in this torque segment reached more than 1.2 million units. At present, the first gear ratio of single countershaft transmissions in this torque segment on the market is concentrated in the range of 3.768-6.802, and the center distance of the transmission is concentrated in the range of 77.5-100mm. When the ratio is 6.802, the corresponding center distance is 100mm; for the single intermediate shaft five-speed transmission (MSG-AL) with the same torque range, when the center distance is 90mm, the correspond...

AI Technical Summary

Problems solved by technology

In 2012, the sales volume of light truck transmissions in this torque segment reached more than 1.2 million units. At present, the first gear ratio of single countershaft transmissions in this torque segment on the market is concentrated in the range of 3.768-6.802, and the center distance of the transmission is concentrated in the range of 77.5-100mm. When the ratio is 6.802, the corresponding center distance is 100mm; for the single intermediate shaft five-speed transmission (MSG-AL) with the same torque range, when the center distance is 90mm, the corresponding maximum speed ratio of the first gear is 5.00, although it is in a The gear ratio is within the selected range, but its own power output is insufficient, and its climbing ability is relatively weak, and due to its structural limitations, when the center distance is constant, the axial dimension of the transmission is long, making it larger. The gear adopts the method of sliding gear sleeve, which cannot meet the market demand for high-end products in the 196-260Nm torque range in all aspects

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