T/JMES 004-2022 Non-road drive gearbox spiral cone gears

Scope

Scope: This document specifies the terms and definitions, requirements, test methods, inspection rules, marking, packaging, transportation, storage, and use of helical bevel gears for off-highway vehicle drive axles. This document applies to helical bevel gears used in off-highway vehicles powered by fuel or electricity. Main technical content: This standard specifies the main indicators of product accuracy, performance requirements, appearance quality, and inspection methods for helical bevel gears used in off-highway vehicle drive axles. The gear materials should meet the requirements of GB/T 3077 or GB/T 5216, and it is recommended to use 20CrMoH, 22CrMoH, 20CrMnTiH, and 20CrMnTi. The quenching hardness index can also be adjusted according to GB/T 5216 to meet the requirements of gear strength and core hardness. The gear material quality grade should meet the MQ level requirements of GB/T 34805, and the oxygen content in the material should be ≤0.002%. The gear blanks should be forged blanks, and the forging ratio should be between 1.5 and 3.0. The forged blanks should undergo preliminary heat treatment, and it is recommended to use isothermal normalizing treatment. The gear accuracy should comply with level 7 in GB/T 11365. The surface roughness of the working tooth should be Ra1.6, and the surface roughness of the tooth root and transition fillet should be Ra3.2. The gear pair should run smoothly on the rolling inspection machine without abnormal sounds such as impact, collision, and vibration.

Development Information

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