Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Production method for second gears of automatic automotive transmissions

A technology of automatic transmission and gear teeth, which is applied to components with teeth, mechanical equipment, belts/chains/gears, etc. It can solve the problems of reducing the smoothness and flexibility of shifting, reducing the interchangeability of gears, and high parts scrap rates. Achieve the effect of reducing production cost and quality risk, stable size and low scrap rate

Inactive Publication Date: 2014-04-30
CHONGQING CHUANGJING WARM FORGING FORMING
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the shift gears of the DCT automatic transmission are usually machined by lengthening the gear wheelbase. First, the wheelbase is lengthened to increase the size of the blank, which increases the consumption of materials. Secondly, the synchronous tooth shape is processed by machine tool gear shaping and milling for a long time. It increases its manufacturing cost; and the precision is not too high, which reduces the smooth flexibility of shifting and also reduces the interchangeability of gears
In addition, this kind of mechanical processing method requires a large machining allowance, and the previous process basically needs to reserve enough machining allowance. The size required for the shift gear blank is too large, and the metal raw materials consumed are relatively large. Secondly, this kind of mechanical processing method is prone to waste products in multi-channel mechanical processing procedures, and the scrap rate of parts is high, which also increases its manufacturing cost.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Production method for second gears of automatic automotive transmissions
  • Production method for second gears of automatic automotive transmissions
  • Production method for second gears of automatic automotive transmissions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing second-gear teeth of an advanced automatic transmission for automobiles, comprising the following steps:

[0032] (1) According to the process design requirements, the raw material (20CrMoH) is cut into material sections, the surface is ground by centerless grinding, the crack is inspected by flaw detection, and then the lubricant is sprayed and dried. The selected raw material is 20CrMoH. After blanking according to the process design requirements, firstly grind the surface and then check whether there are cracks with flaw detection equipment. If there are any, it will be judged as unqualified; The agent is graphite or organic polymer lubricant, which acts as a lubricant.

[0033] (2) Heat the blank to 810°C~850°C in an intermediate frequency induction heating furnace of nitrogen or inert gas, and warm forge it on a press to form a pre-forged billet with a tooth shape. The slope of the forging die blank is 2 to 4° larger (such as figure 2 The ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
hardnessaaaaaaaaaa
Login to View More

Abstract

The invention provides a production method for second gears of automatic automotive transmissions. According to the production method, pre-forging blanks are subjected to cold extrusion after being produced by isothermal forging. The production method is characterized in that the inclination of the inner walls of modified grooves of the pre-forging blanks is 2-4 degrees larger than that of finish-forging blanks. Products produced by the production method are high in accuracy and low oxidizing, good internal structure of metal is realized, crystal grains are fine, and poor textures such as coarse crystals and mixed crystals are avoided; equipment as needed is low in tonnage and small in forming fore, filling of tooth profile is easy, unit pressure borne by molds is remarkably reduced, and service life of the molds are quite long; product hardness reaches HB130-150, and metal structure reaches the second level; the tooth profile is fully filled and does not deform during heat treatment after cold extrusion forming.

Description

technical field [0001] The invention belongs to the field of metal processing, and relates to a preparation method of gears in a power transmission transmission system of an automobile automatic transmission (DCT), in particular to a preparation method of shift teeth of an advanced automatic transmission of automobiles. Background technique [0002] Automobile automatic transmission (DCT) shift gear is an important part of automobile automatic transmission. It plays the role of shifting and shifting gears. It includes recessed grooves, and the synchronous teeth are all sunk in the grooves. The quality of its production is directly related to the quality of the car. safety and passenger comfort. [0003] In the prior art, the shift gears of the DCT automatic transmission are usually machined by lengthening the gear wheelbase. First, the wheelbase is lengthened to increase the size of the blank, which increases the consumption of materials. Secondly, the synchronous tooth shap...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/14
CPCB23P15/14F16H55/17
Inventor 胡活苏涛高凤强
Owner CHONGQING CHUANGJING WARM FORGING FORMING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com