Tractor Dry Single Plate Spring Clutch | Agricultural Tractor Clutch Assembly
Jun 05, 2026
Classification of Automobile & Agricultural Machine Clutches
Most farm tractors adopt axial spring single-plate dry friction clutch, the most popular clutch type for small and medium horsepower Chinese tractors.
The clutch relies on axial clamping force to compress two friction discs and transmit rotary torque from the driving shaft to the driven shaft.
Torque Transfer Formula:
To transmit power from Shaft 1 to Shaft 2, flat discs are pressed together by axial force F. Friction generated between Disc A and Disc B transfers rotary motion from Shaft 1 to Shaft 2.
T = μFR
μ = friction coefficient between paired friction discs
F = axial clamping compression force
R = effective average radius of clutch friction surface
Core Standards for High-Quality Tractor Clutch
Rated transmission torque reaches 1.25~1.5 times the tractor engine's maximum output torque to avoid slipping under heavy farm loads.
Friction facing material keeps stable friction coefficient under continuous field working conditions.
Excellent heat dissipation performance to dissipate heat generated from friction between flywheel, pressure plate and clutch disc and prevent overheat damage during long-hour ploughing, harvesting and haulage work.
Low moment of inertia for smooth, quick gear change without residual high-speed rotation of clutch disc.
Built-in shock absorption structure to buffer sudden impact load during clutch engagement.
Strict dynamic balance processing to eliminate abnormal vibration during high-speed operation.
Light pedal operation reduces driver fatigue for all-day agricultural work.
Main Components of Axial Spring Single Plate Tractor Clutch
Flywheel: Fixed with engine crankshaft to store rotational kinetic energy.
Clutch Disc (Clutch Plate): Splined steel hub base with riveted friction lining around outer edge, the key friction transmission component.
Pressure Plate: Compresses clutch disc against flywheel under spring preload to realize power connection.
Axial Compression Springs: Supply consistent clamping force for friction torque transmission.
Clutch Cover: Protect internal clutch components and transfer flywheel rotation to pressure plate.
Clutch Release Mechanism: Controls separation and engagement of clutch disc to cut off or connect engine power.
Common Friction Lining Materials for Tractor Clutch Disc
Different raw materials decide clutch service life and friction performance for farm machinery:
Leather: Dry friction coefficient against steel: 0.27
Cork: Dry friction coefficient against steel: 0.32
Woven Fabric: Dry friction coefficient against steel: 0.4, poor high-temperature resistance
Asbestos Material: Dry friction coefficient against steel: 0.2, outstanding heat resistance but banned for health hazards
Ferodo Friction Material: Base asbestos composite, friction coefficient 0.35
Product Remark
Our factory supplies full-series replacement clutch kits matching TR 8HP–280HP Chinese tractors, compatible for aftermarket replacement for Mexico, Central Asia, Balkan and African tractor dealers.
