Gear selection and shift system for gear box

Abstract

The invention discloses a gear selection and shift system for a gear box in the technical field of automobile gear boxes. The gear selection and shift system comprises a gear selection and shift shaft arranged in a gear box shell, a gear selection and shift head sleeved on the gear selection and shift shaft and four groups of gear shift fork mechanisms sequentially connected with the gear selection and shift head, wherein each group of gear shift fork mechanism comprises a shift fork shaft, a gear shift block and a shift fork, and the gear shift block and the shift fork are connected with the shift fork shaft; and the four groups of gear shift blocks are contacted with the gear selection and shift head respectively. Compared with the prior art, the gear selection and shift system has the advantages that: a reverse gear lock mechanism is simplified, a gear selection and shift interlocking function and a reverse gear insurance function are realized, the rotating speed of an input shaft is reduced, and the speed of the input shaft is increased; therefore, a reverse gear can be meshed stably and smoothly.

Description

technical field [0001] The invention relates to the field of mechanical devices, in particular to a gear selection and shifting system of a transmission that eliminates a reverse gear lock device and can avoid gear kicking during reverse gear shifting. Background technique [0002] With the development of science and technology and the progress of society, automobiles have become an indispensable means of transportation in people's daily life and industrial and agricultural production. In the "Twelfth Five-Year Plan" plan, the automobile industry technology has also become a key support area of ​​the Ministry of Science and Technology, that is, to move from a big automobile country to a powerful automobile country, with practical independent innovation capabilities, breakthroughs in the internationalization of core components, and real industrial upgrading. Therefore, how to achieve this goal through technological innovation has become the core issue that must be solved in t...

AI Technical Summary

Problems solved by technology

But the disadvantage of this technology is: the design cost is high, the structure is complex, and the fixing method of the first and second gear shift forks and the reverse gear shift fork on the fork shaft of the technical structure are not firm. Taking the first and second gear shift forks as an example, due to Due to the function of the self-locking assembly, the first and second gear forks are in close contact with the inner hole and the fork shaft. When changing to third and fourth gears, under the influence of gearbox vibration and friction, the first and second gear forks may move a little. Therefore, there will be two sets of synchronizers working at the same time during the shifting process, causing certain work risks

However, the disadvantages of this technology are: high manufacturing cost and difficult processing, and the stamping parts will cause inaccurate positioning

[0006] To sum up, the above-mentioned existing technologies all suffer from the phenomenon that the gear meshing is not stable enough due to the slow reduction of the speed of the input shaft in the process of shifting gears, and noise and tooth beating occur when the reverse gear is engaged.

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