Reverse Idler Gear Assembly

Anyone who has driven a manual transmission knows that reverse gear makes a noticeably loud humming noise. This is because reverse is the only gear in the gearbox without a synchronizer, and the idler gear typically uses straight teeth with high meshing impact. The reverse idler gear assembly is the intermediate component responsible for transmitting power in reverse. Its precision and tooth profile processing directly determine the noise and smoothness when reversing. We make Reverse idler gear assemblies to make this noisiest gear a little quieter and smoother.

Gears use carburizing steel such as 20CrMnTi or 20CrMoH, with teeth carburized and quenched to HRC 58–62-tough core, impact-resistant. Tooth profiles are machined on gear hobbers, reaching precision grade 7 or above per GB/T 10095; critical parts can also be ground. The idler gear shaft uses 40Cr or 45# steel, quenched and tempered, with journal surfaces super-finished to below Ra0.4μm for smooth rotation. After assembly, meshing clearance detection and rotation testing ensure flexible rotation with no sticking. Reverse idler gear assemblies are used in reverse gear mechanisms of manual gearboxes in passenger vehicles, commercial vehicles, forklifts, and agricultural machinery. Every assembly undergoes full inspection before shipping, and noise testing per customer requirement is available. Years of gearbox parts manufacturing, stable process, good batch consistency. After years of making Reverse idler gear assemblies, we have found that for reverse gear noise, gear precision is only one aspect-meshing clearance and shaft concentricity are the key, and these are strictly controlled. Send us your drawings; sample first.

● Passenger and commercial vehicle manual gearboxes

● Forklift and agricultural machinery gearboxes

● Reverse gear mechanism repair parts

● Industrial gearbox reverse drives

Customization from drawings and samples supported. Gear module, tooth count, pressure angle, face width; idler shaft diameter, length, lubrication structure all adjustable per drawing, no strict MOQ. Reverse gear noise tuning supported-gear tooth profile modification and meshing clearance optimized per requirement. Custom samples typically 15–20 working days, appropriately longer for processes including gear grinding. Sample fee fully deductible against bulk orders. Sample first to confirm meshing and noise level, then batch.

Operating under IATF 16949. Gears: tooth profile and lead testing (gear inspection center) and hardness testing (tooth surface HRC 58–62), precision grade 7+ per GB/T 10095. Idler shaft: straightness and journal roundness testing, surface roughness below Ra0.4μm. After assembly: meshing clearance detection and rotation testing for flexible, no-sticking operation. Every piece fully inspected before shipping. Noise testing per customer requirement available. Third-party inspection accepted.

Gear tooth surfaces sleeved in PE mesh to prevent bumps; journals coated with rust preventive oil; placed in plywood boxes with VCI rust inhibitor strips; gears separated by dividers to prevent tooth surface collision. Shipping marks, product name, quantity, gross/net weight labeled externally. All export-reinforced packaging. EXW and FOB supported. If issues during transit, provide photo/video within 3 days; if our responsibility, free replacement or partial refund; logistics causes: full assistance in claims.

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