20CrMnTi ISO 6 Grade OEM Transmission Gear Shaft with Cylindrical Type

1)Description of Transmission Gear Shaft

A gear shaft is a critical component within mechanical transmission systems that integrates gears and shafts into a single unit. It is not merely a simple combination of ‘gear plus shaft’, but rather involves directly machining gear teeth onto a shaft through processes such as forging or cutting. It bears the core responsibility of transmitting power and torque.

2)Working Pinciple

The gear shaft transmits rotational motion and power from a driving source, such as an electric motor, by meshing its tooth profile with that of another gear (or rack). When the driving gear shaft rotates, its teeth impel the teeth of the driven gear, thereby altering rotational speed, torque, and direction of motion. This operation adheres to the fundamental principle of gear transmission: equal linear velocity at the point of meshing.

3)Feature of Transmission Gear Shaft

• Integrated design: The gear and shaft form a single unit, requiring no connecting elements such as keys or pins.
• High-strength tooth roots: The absence of assembly interfaces typically yields greater root strength than split designs.
• Precision journal ends: Both shaft ends (journal surfaces) undergo precision machining to ensure optimal bearing fit and support.
• Material consistency: The entire component is fabricated from a single material, commonly alloy steels (e.g., 20CrMnTi) or carbon steels.

4)Advantages of Transmission Gear Shaft

• Compact design: Eliminates connecting components, reducing axial dimensions and part count.
• High load capacity: The integrated structure avoids stress concentration and loosening issues associated with keyed connections, enabling transmission of greater torque.
• Excellent alignment and precision: Exceptional coaxiality between gears and shafts minimises vibration and noise during high-speed operation.
• High reliability: Fewer components correspondingly reduce potential failure points.

5)Application

Widely employed in applications demanding high structural compactness, precision and reliability, such as:

• Automotive transmissions: Internal input and output shafts frequently adopt gear shaft configurations.
• Industrial gearboxes: Particularly sun gears and planetary gears within planetary gear reducers.
• Aviation engines: Auxiliary power unit drive systems.
• High-precision machine tools: Spindle drive systems.