Reverse Idler Gear Shaft

This reverse idler gear shaft is the main support for the reverse gear in a manual transmission. It provides the idler gear with a precise rotational axis. We use high-rigidity materials and a fine grinding process, ensuring excellent straightness, roundness, and a smooth surface. The shaft maintains stable dimensions and strong resistance to bending, holding the idler gear firmly in place. This reduces uneven loads and noise when the gears engage, allowing the reverse gear to operate smoothly and quietly, making backing up more comfortable.

This reverse idler gear shaft is designed specifically for the reverse gear set. The idler gear rotates freely on the shaft to change the power direction. Shaft accuracy directly affects the smoothness, reliability, and longevity of the reverse gears. It performs well during repeated forward and backward movements in tight spaces and remains stable when starting on a slope in reverse. The shaft ensures smooth and consistent power flow, helping to prevent hard engagement or unusual noises, making it a critical component for long-term reverse operation.

We manufacture this shaft from high-quality alloy structural steel, such as 40Cr. Heat treatment provides excellent overall mechanical strength. The gear-contacting surface is super-finished, with roughness below Ra 0.4 μm. Optional phosphate or oxide coatings are available to improve wear resistance and assist with initial running-in. Every part undergoes strict cleaning and rust prevention, ensuring reliable performance in transmission fluid over extended use with minimal wear or corrosion.

The shaft's diameter, length, shoulder positions, and tolerances are precisely controlled to match the gearbox housing and gear design. We offer standard sizes as well as fully customized options. Our team can also assist with details such as lubrication grooves or lightening holes. Accurate size control ensures proper clearance for the idler gear, preventing sticking or excessive movement, and helping you achieve optimal reverse gear system performance.

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