Precision Transmission Gear Shaft Assembly

As a core drive unit in power transmission systems, this assembly integrates a large-module disc gear with a multi-stage stepped shaft. It is commonly used in the reduction gears or valve trains of agricultural machinery, garden equipment, and small internal combustion engines. The design features a rigid connection between the gear and shaft via flange bolt holes, while stepped surfaces of varying diameters facilitate bearing positioning and seal installation, ensuring controlled radial runout and smooth transmission during high-speed rotation.

The key to manufacturing this assembly lies in maintaining the meshing accuracy of the gear teeth and the coaxiality of the support journals. Critical controls include tolerances for the gear pitch circle diameter, tooth profile and lead errors, and the positional accuracy of reference surfaces on each shaft section. The process typically involves CNC gear hobbing for tooth formation, followed by precision grinding of key mating surfaces using CNC cylindrical grinders to meet strict dimensional tolerances and surface roughness requirements. For high-load applications, processes such as quenching and tempering or carburizing are employed to enhance core toughness and tooth surface wear resistance.

Taizhou Dingzhen Cam holds IATF 16949 certification and is equipped with specialized machinery, including CNC gear hobbers, gear honing machines, and a gear testing center. We provide one-stop delivery from forging blanks to finished precision machining. The factory supports customized material selection (e.g., 40Cr, 20CrMnTi alloy steels) and heat treatment based on customer drawings. We also provide comprehensive quality documentation, including material certificates, hardness test reports, and full-dimensional inspection records, effectively meeting the procurement needs for stable batch delivery in the automotive parts and powertrain industries.