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SWC/SWP/SWZ
Tangmo
A universal joint shaft (UJ shaft) is a high-torque, heavy-duty mechanical transmission component used to connect two rotating shafts whose axes are not collinear — typically with angular misalignment up to 15–25° per joint, or up to 45° for double-joint configurations. It is widely applied in rolling mills, paper machinery, marine propulsion systems, mining equipment, and large industrial drives.
The universal joint shaft operates on the Hooke’s (Cardan) joint principle: two yokes connected by a cross-shaped trunnion (spider) with needle roller bearings allow angular flexibility while transmitting torque. When a single joint operates at an angle, it produces non-uniform angular velocity in the driven shaft. To achieve constant velocity (CV) behavior, shafts are typically arranged in double-joint pairs (e.g., Z- or W-configuration) with intermediate supports or phased yokes.
| Component | Function | Material (Typical) |
|---|---|---|
| Cross assembly | Transmits torque through four trunnions | High-alloy steel (20CrMnTi, 17CrNiMo6), case-carburized and hardened |
| Yokes (flange/fork) | Connect to driving and driven equipment | Forged alloy steel (42CrMo4, 40CrNiMoA) |
| Needle roller bearings | Reduce friction under high radial loads | GCr15 steel, precision-ground rollers |
| Shaft tube (solid or hollow) | Transmits torsional load; hollow design reduces inertia | Seamless steel tube, welded or integral forging |
| Seals (multi-lip, labyrinth) | Prevent lubricant leakage and contaminant ingress | Nitrile rubber (NBR) or FKM |
High torque density: Optimized cross-section geometry enables torque transmission up to several MN·m in heavy-duty models.
Angular compensation: Accommodates parallel offset, angular misalignment, and limited axial displacement (with splined extensions).
Safety margin: Designed with fatigue-resistant bearings and induction-hardened trunnions (HRC 58–62, case depth 1.5–2.5 mm).
Lubrication system: Centralized grease channels or oil-bath lubrication for extended service life in dusty/moist environments.
Critical speed optimization: Hollow shafts and dynamic balancing (G2.5–G6.3 per ISO 1940) reduce vibration at high RPM.
Metallurgical industry: Main drive spindles for continuous casting, hot/cold rolling mills, and shears.
Paper industry: Dryer section drive shafts with long center distances.
Mining & cement: Bucket wheel excavators, vertical roller mill drives.
Marine & power generation: Intermediate shafts between engine and propeller shaft (with corrosion-resistant coatings).
Engineers should specify:
Torque rating (continuous vs. peak, with service factor 1.5–3.0 depending on shock load)
Angular misalignment range (dynamic operating angle)
Operating speed (relative to critical speed)
Splined shaft stroke (required axial movement)
Environmental factors (temperature, dust, moisture, chemicals)
Bearing clearance should be checked every 2000 operating hours.
Use EP (extreme pressure) lithium-complex grease NLGI #2 for standard conditions.
Worn cross assemblies must be replaced in sets to maintain dynamic balance.
Crack detection (MPI or DPI) recommended during overhaul of large shafts.
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