Guangzhou Meishun Automatic Transmission Co., Ltd.
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Key Specifications:
Spline Design: 38 involute splines (12° pressure angle) with 0.8–1.2µm hardened surface finish for gear engagement
Material: Case-hardened 20MnCr5 steel (58–62 HRC core, 850HV surface)
Gear Match: Mated to planetary carrier with 0.02–0.05mm backlash tolerance
Critical Functions:
Transmits 320Nm in 2nd/4th/6th gears
Oil passages for clutch cooling (flow rate: 4–6 L/min)
Failure Modes:
Spline fretting (if backlash exceeds 0.1mm)
Lubrication starvation marks at >120°C
Note: Updated from 8HP45 with 15% wider spline base for 6000+ shift cycles. Requires ZF-approved friction modifier additives.
