The main function of the shift fork is to move the gears in the gearbox to achieve the purpose of shifting speeds in cars and tractors. There is a ring groove on the sliding gear, and the shift fork rides in this ring groove. When the driver pushes the shift lever, the shift skewer drives the shift fork shaft, and the shift fork shaft drives the shift fork, which in turn pushes the gear to achieve the purpose of shifting.
Shift fork parts are important parts in the gearbox of automobiles and tractors. The quality and assembly of the shift fork are important links in the development of automobile and tractor parts. The quality of the assembly is directly reflected in the performance of the entire vehicle. and quality. The most easily worn part of the shift fork is the contact area between the shift fork and the gear ring groove. Because the gear rotates at high speed but the shift fork does not rotate, the shift fork is worn or not strong enough, which may cause the gear to not hang in place and fall out of gear, or the shift fork to break lose.
The shift fork is generally made of high-quality carbon structural steel - 45# steel. It is also made of cast carbon steel through precision casting. The production process of high-quality carbon structural steel: hot-rolled bar → hot cutting → die forging → trimming → quenching and tempering (quenching and high temperature tempering) → cold correction → induction quenching of the fork part → grinding → finished product flaw detection → assembly and use . If the fork parts fail, use the medium frequency induction heating machine to easily solve the problem! Here are a few examples.
Example 1: The second and third gear shift forks of a transmission broke during use. Cause analysis: The main reasons are surface decarburization and heat treatment deformation. Preventive measures: Prevent and reduce surface decarburization and heat treatment deformation.
Example 2: The fourth and fifth gear shift forks of a transmission broke during use. Cause analysis: The main reason is caused by heat treatment deformation and interference of related parts. Preventive measures: Reduce heat treatment deformation.
Example 3: During the flaw inspection of a finished product of a middle-wheel drag shift fork, cracks were found on the fork mouth surface. Cause analysis: The cause is grinding cracks. Preventive measures: Improve the grinding process to prevent grinding cracks.
Example 4: During the processing and flaw detection of the large-wheel tractor fork, cracks were found. Cause analysis: The cause is quenching and tempering cracks. Preventive measures: Improve the heat treatment process to prevent the occurrence of quenching, tempering and quenching cracks.
Example 5: A transmission fork (material ZG310-570) broke during use. Cause analysis: The cause is casting shrinkage. Preventive measures: Improve the casting process to prevent the occurrence of casting shrinkage cavities.
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GS-ZP-1200
