Machining technology for automotive transmission gear

Abstract

The invention discloses a machining technology for an automotive transmission gear. In a technological flow, the sequence of gear grinding of the gear and press fitting of the gear and a shaft is adjusted; the specific flow comprises the following steps: firstly, carrying out rough machining, hobbing, heat treatment and fine machining on a gear blank; then pre-heating an inner spline of the gear;selecting the shaft which is in press fitting with the gear; carrying out press fitting on the machined gear and the shaft; and after the press fitting is finished, carrying out gear grinding machining on the gear. By adopting the technology, iron chips between the gear and the shaft are reduced and the precision of the gear is improved; a process and working procedure technology is optimized andNVH (Noise Vibration and Harshness) of a transmission assembly is improved; a transmission gear machining working procedure is optimized so that the eccentricity caused by the fact that the press fitting is carried out after the gear grinding is carried out is made up and transmission errors are reduced; the gear engagement accuracy can be greatly improved and a transmission error value of the transmission assembly is reduced very well; a noise value of a transmission can be reduced very well and customer complaints of aftersales markets are reduced; and the machining technology can be appliedand implemented in a large scale and the competitiveness of enterprises is improved.

Description

technical field [0001] The invention relates to the technical field of automobile transmissions, in particular to a gear processing technology for automobile transmissions. Background technique [0002] With the clamor of social environment and public nuisance control, the requirements for low noise of automobiles are becoming stronger and stronger. However, with the rapid development of electric vehicles, the vibration and noise of transmissions are particularly prominent, and the market complains seriously. First of all, noise is harmful to the human body. People's health will be damaged to varying degrees in living, studying and working. Studies have shown that steady-state and unsteady-state noises have different effects on people, and the most unfavorable to people is the unsteady-state noise. At the same time, with the rapid development of the automobile industry, the agglomeration of car ownership in society has increased, so the noise generated by cars has a particu...

AI Technical Summary

Problems solved by technology

Therefore, noise reduction of powertrain noise is very difficult and requires long-term optimization; among them, gear meshing noise is another major aspect; the research on the mechanism and influencing factors of gear meshing noise formation and propagation is theoretically and practically important. There have been relatively mature clarifications; it is generally believed that improving the machining accuracy of transmission components, especially gears, is a very effective measure; but it is believed that the pursuit of machining accuracy not only has many difficulties in production, resulting in increased costs, but also has little potential. Therefore, the research on transmission noise has been extended to the field of comprehensive treatment.

[0004] At present, the conventional process of the transmission assembly is to grind the teeth first and then cold press, resulting in more iron filings when the splines inside the gear and the splines outside the shaft are pressed, which affects the matching effect between the shaft and the gear. Long-term work will cause the shaft and the gear to Generate relative movement, resulting in abnormal sound of transmission and decrease of durability life

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