Machining process of shaft of drive motor of new energy automobile

Abstract

The invention relates to a machining process of a shaft of a drive motor of a new energy automobile. The machining process includes the steps that (1), a blank is manufactured, wherein feeding is carried out according to process requirements; (2), the blank is subjected to annealing treatment; (3), three gears of outer circles are roughly turned on the blank; (4), the surface of the blank is lubricated; (5), an internal spline is manufactured through cold extruding; (6), a second positioning hole is formed in the other end differing from the end where the internal spline is arranged; (7), machining is carried out according to the process requirements; and (8), after the end where a second center hole is formed is subjected to anti-carburization treatment, threads are machined in the end. The machining process has the following beneficial effects that the coaxiality of the axis of the internal spline and the axes of all the gears of outer circles is greatly improved, and the deviation degree can be controlled within 3.5 mm.

Description

technical field [0001] The invention relates to the field of new energy vehicle motor shafts, in particular to a processing technology for new energy vehicle motor shafts. Background technique [0002] The development of new energy vehicles is the strategic direction of the country. my country's new energy vehicles include: pure electric vehicles and plug-in hybrid vehicles. [0003] The drive motor is the core part of the new energy vehicle. The motor shaft is the key component of the entire drive motor, which plays the role of fixing the rotor core and transmitting power. Its performance directly affects the performance of the power system of the new energy vehicle. [0004] The drive motor shaft connection end is the output end of the motor. After the drive motor generates power, it is connected with the automatic transmission or deceleration mechanism of the automobile through the internal spline of the end. The internal splines of this part have been manufactured by pu...

AI Technical Summary

Problems solved by technology

The internal splines of this part have been manufactured by pure machining before, and there are the following problems: ①The internal splines are processed by gear shaping machine tools with poor tooth profile accuracy

② Due to the cutting process, the metal flow line is cut off, and the service life of the tooth profile is only 20,000 kilometers.

③The processing efficiency is low, and the shift output is only 200 pieces / shift

④ low utilization rate of materials

[0006] However, the existing drive motor shafts manufactured by cold extrusion generally have the following problems: ①The drive end, that is, the end with internal splines, is usually extruded by cold extrusion technology and the other end is passed through Welding is on the drive motor shaft. This structure results in poor concentricity between the inner spline and the drive motor shaft and weld scars at the joint, which is poor in aesthetics. There are also cases where the inner spline is directly cold-extruded on the drive motor shaft. , but the coaxiality of the inner spline axis and the outer circle of each block of the drive motor shaft after cold extrusion cannot be guaranteed