Heavy duty gearbox

Abstract

The invention discloses a heavy duty gearbox. The heavy duty gearbox comprises a box body, a first shaft, a second shaft and a control assembly. A first shaft gear is installed on the first shaft. A plurality of main shaft gears, a plurality of shift sleeves and a reverse gear set are installed on the second shaft. A middle shaft is arranged on the side edge of the second shaft in a parallel mode,and a middle gear set is installed on the middle shaft. The middle shaft gear set comprises a first transmission gear in constant meshing with the first shaft gear, and middle gears in constant meshing with the main shaft gear. The control assembly comprises a plurality of selecting and shifting shafts located in the box body, a shifting fork is correspondingly installed on each selecting and shifting shaft, and each shifting fork is correspondingly connected with one shift sleeve. The shift sleeves can move along the second shaft in the axial direction when stirred by the shifting forks. According to the heavy duty gearbox, the single-box structure design is adopted, a plurality of forward gears and a reverse gear are arranged in the box body, and a secondary box is removed, so that thestructure of the gearbox is simplified, the cost of the gearbox is reduced, the transmission efficiency of the gear box is improved, and the reliability of the gearbox is improved.

Description

technical field [0001] The present disclosure relates to a gearbox, in particular to a heavy-duty gearbox. Background technique [0002] The traditional heavy-duty truck gearbox adopts the auxiliary box structure. The biggest advantage of this structure is to achieve the most gears with the least gear set. For example, the mainstream product 12JSD series of Fasttech uses a 6*2 structure, that is, The main box realizes 6 forward gears, and after the double gear design of the auxiliary box, 12 gears can be realized. At the same time, this structure can also shorten the length of the assembly and reduce the overall weight, thus occupying the mainstream position in the domestic and foreign markets for a long time. [0003] The domestic new energy truck market is booming. Given that the total weight of heavy trucks is too high, the motor direct drive solution cannot be satisfied, and the wheel-side deceleration solution is not yet mature. The current mainstream solution is still ...

AI Technical Summary

Problems solved by technology

[0004] 1. The switching of the auxiliary box is slow. In view of the particularity that the auxiliary box sub-assembly must be equipped with a synchronizer, its switching time is longer, which is more than three times the shifting time of the main box. If it is shifted on a flat road, it will cause The power loss time is prolonged. If you shift gears on a slope, there is a high probability that you will not be able to shift gears, stop on a slope, or even slip backwards;

[0005] 2. The failure rate of the auxiliary box is high. According to statistics, the failure of the auxiliary box synchronizer, the failure of the auxiliary box gear combination tooth has long occupied the first place in the failure rate, and even becomes a vulnerable part. This is in line with the current new energy market Sandian requirements of 5 Years or 200,000 kilometers are not matched, and traditional gearboxes only have a warranty period of 1 year or 100,000 kilometers;

[0006] 3. Because of the existence of the auxiliary box in the traditional gearbox, the power flow route of half of the gears is transmitted through 4 sets of gears, and its transmission efficiency is about 93%, while the power flow route of the remaining half of the gears is transmitted through 2 sets of gears , its transmission efficiency is around 95%

Combining the two, it can be said that the existence of the auxiliary tank leads to a loss of efficiency of 1% to 3%.

[0007] To sum up, the traditional gearbox cannot meet the needs of the new energy market, and there is a waste of materials and efficiency

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