Starter output shaft and processing technology thereof

Abstract

The invention discloses a starter output shaft and a processing technology thereof. The starter output shaft comprises a plurality of planetary gear shafts formed at the front of the output shaft, and a cylindrical output shaft. The starter output shaft is characterized in that the planetary gear shafts and the output shaft are in an integral structure; and as for the process technology, a second balling annealing treatment is carried out after forging; then shot blasting is carried out again; and then a starter output shaft blank is subjected to a second surface treatment; and then a boss forging processing is carried out on the middle of the output shaft. A forging method is used for processing the integral output shaft, and a shunting forging principle is employed to add the material shunting boss to make forging processing feasible, so as to greatly improve the processing efficiency, and reduce the processing cost of the product.

Description

technical field [0001] The invention belongs to the technical field of machinery and relates to a starter output shaft, in particular to a starter output shaft with an integral structure and its processing technology. Background technique [0002] The electric starter is almost the only way to start a car now. The reduction mechanism of the planetary gear reduction starter has a compact structure, a large transmission ratio, and high efficiency. The reason for this is that the output shaft and the armature shaft of the planetary gear reduction starter Coaxial and co-rotating, the armature shaft has no radial load, the vibration is light, and the size of the whole machine is reduced; in addition, the planetary gear type deceleration starter also has the following advantages: (1) The load is evenly distributed among the three planetary gears In addition, the plastic inner ring gear and powder metallurgy planetary gear can be used to reduce the weight and noise; (2) Although th...

AI Technical Summary

Problems solved by technology

Since the output shaft 505b mainly transmits torque during the starting process of the vehicle, the planetary gear shaft 505b 2 with output shaft 505b 1 The press-fitting control requirements are very high, and the large amount of interference may easily cause the output shaft 505b 1 A is cracked, and the small fit interference can easily cause the planetary gear shaft 505b 2 fall off, these two situations are likely to cause early failure of the starter, and because the output shaft 505b 1 The planetary gear shaft 505b needs to be press-fitted after heat treatment 2 , the deformation of heat treatment is not easy to control, which causes the inconsistency of the press fit interference

[0004] In the existing structural processing technology, there are generally two types of existing process routes, among which the processing method of the 4 planetary gear shaft hole is cutting (drilling, milling processing) or punching processing. The main process is as follows: blanking (sawing or forging) )→spheroidizing annealing→shot blasting→surface treatment (phosphorus saponification or polymer lubricant coating)→forging (2 or 3 times)→cutting→planetary gear shaft hole processing (cutting or punching)→spline Processing → product quenching treatment → press fit planetary gear shaft → grinding, etc., because the product is press fit planetary gear shaft after quenching, the deformation of the heat treatment makes the hole diameter tolerance of the output shaft larger, making the product unstable after press fitting

[0005] The main reason why the existing product is a split structure is that the planetary gear shaft 505b 2 The cross-sectional area relative to the output shaft 505b 1 The area ratio of the flange is small, that is, the amount of forging deformation is too large (much greater than 90%), and it cannot be forged, and because there is no machining equipment for processing this shape

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