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Commercial vehicle gear box three-speed gear induction quenching process

A three-speed gear and induction hardening technology, which is applied to the improvement of process efficiency, manufacturing tools, furnace types, etc., can solve the problems of no induction hardening technology, etc., and achieve the elimination of oil hole crack tendency, productivity improvement, and reasonable structural design Effect

Inactive Publication Date: 2012-04-11
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there is no information about the successful application of induction hardening technology on automotive transmission gears.

Method used

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  • Commercial vehicle gear box three-speed gear induction quenching process
  • Commercial vehicle gear box three-speed gear induction quenching process
  • Commercial vehicle gear box three-speed gear induction quenching process

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Embodiment Construction

[0014] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings, induction hardening technical requirements, induction heating and quenching sequence design of three parts and induction hardening process of each part:

[0015] 1. Design of gear materials and induction hardening technical requirements

[0016] Selected material: 45# medium carbon steel

[0017] Original tissue state: normalizing HBW157~197

[0018] Surface hardness: HRc56~62

[0019] Hardened layer depth 1.0~2.2

[0020] Effective hardened layer depth limit value HV450

[0021] According to the actual service conditions of the gear parts, the induction hardening parts are designed to be three places, namely the meshing teeth 15, the coupling teeth 14 and the bearing holes 16 (such as figure 1 shown).

[0022] 2. The quenching sequence design of the meshing teeth, coupling teeth and bearing holes

[0023] Due to the short distance be...

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Abstract

The invention relates to a commercial vehicle gear box three-speed gear induction quenching process, which is characterized by comprising the following specific steps of: sequentially performing induction heat quenching on gear parts, namely a joint gear, a meshing gear and a bearing hole. The requirements of gear material selection and induction quenching technical requirement design can be met; three quenching parts, namely the meshing gear, the joint gear and the bearing hole, have a rational technical flow to avoid a mutual tempering phenomenon; a hardened layer of a tooth root of the meshing gear is more than 1 mm and tooth root bending strength is guaranteed; a joint gear inductor has rational structural design, and uniform distribution of the hardened layer in the gear width direction is guaranteed; a sectional continuous heat quenching mode is adopted by the bearing hole, and crack tendency of the bearing hole and an oil hole is eliminated; one-piece gear material and heat treatment comprehensive cost saving ratio is over 20 percent; and the productivity is improved by over 15 percent.

Description

technical field [0001] The invention relates to an induction hardening process for a three-speed gear of a commercial vehicle gearbox, belonging to the technical field of induction heating. Background technique [0002] For a long time, the surface hardening production process of automobile gearbox gears has always adopted the traditional carburizing and quenching process. The production cycle of this process is longer, the efficiency is lower, and the material and process costs are higher. Although the carburizing process has been improved in all aspects in recent years, no major breakthrough has been made in terms of production efficiency and cost control. Therefore, it is of great significance to develop high-efficiency and low-cost gearbox gear surface hardening technology. [0003] In recent years, related enterprises and professional development institutions at home and abroad have never stopped the development and research of gear surface hardening technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/10C21D11/00C21D9/32C21D9/40
CPCY02P10/25
Inventor 崔凯李航宇姜波王宏毛春力郇宜梅高霞
Owner CHINA FIRST AUTOMOBILE
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