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High Quality Truck Parts Planetary Gear Differential Planetary Gear Accessories Differential Bevel Gear

The Planetary Gear Differential is an advanced gear mechanism used in the drivetrain of heavy-duty trucks, off-road vehicles, construction equipment, and high-performance commercial vehicles. Unlike conventional bevel gear differentials, this unit integrates a planetary gear set to provide improved torque distribution, enhanced traction control, and greater durability under extreme operating conditions.

Commonly found in multi-axle drive systems (e.g., 6×4, 8×8), central transmission units, or integrated into hub reduction axles, the planetary differential allows wheels on the same axle—or across multiple axles—to rotate at different speeds while maintaining optimal power delivery. It plays a key role in reducing wheel slip, improving fuel efficiency, minimizing tire wear, and increasing vehicle stability on uneven terrain.
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  • Trailer Parts

Attribute Description
Product Name Planetary Gear Differential
Common Names Planetary Diff, Epicyclic Differential, Axle Reduction Unit
Function Distributes engine torque between wheels/axles; allows speed differentiation
Core Mechanism Sun gear, planet gears (3–6), planet carrier, ring gear (internal teeth)
Application Heavy-duty trucks, trailers, mining trucks, military vehicles, off-road machinery
Mounting Type Inboard (within axle housing) or hub-mounted (hub reduction)
Gear Material Alloy steel (e.g., 20CrMnTi, 42CrMo), carburized & hardened
Heat Treatment Carburizing, quenching, tempering for surface hardness and core toughness
Lubrication System Oil bath or forced lubrication (via axle lube system)
Operating Temperature -40°C to +150°C
Standard Compliance ISO 9001, SAE J615, DIN 743, GB/T 3480, API GL-5 compatible
Sealing Type Double-lip oil seals with anti-leak design
行星齿轮-1


行星齿轮-4


Parameter Specification
Model Number PD-MERITOR-DRA140
Type Planetary Final Drive (Double Reduction)
Gear Ratio (Final Drive) 3.7:1 to 5.9:1 (configurable per model)
Max Input Torque Up to 25,000 N·m
Output Torque Capacity Up to 60,000 N·m (after reduction)
Number of Planet Gears 4 or 6 (symmetrically arranged)
Sun Gear Teeth 16–20
Planet Gear Teeth 18–22
Ring Gear (Internal) Teeth 52–68
Gear Module 5–8 mm
Hardness (Surface) HRC 58–62 (case-hardened)
Bearing Support Tapered roller bearings (high-load capacity)
Lubricant Required API GL-5 80W-90 or 85W-140 gear oil
Weight (approx.) 85–110 kg (varies by axle integration)
Approvals Meets Meritor MSA140 spec, E-marked, ISO 9001 certified


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