The SWC type coupling mainly consists of a cross shaft, inner and outer bearing sleeves (fork heads), flange plates, seals, and lubrication devices (the red component in the picture is a typical structure): 1. Cross shaft: the core torque transmission component, made of high-quality alloy steel forged and formed, treated with quenching and tempering and surface hardening, featuring high bending strength and wear resistance. 2. Bearing sleeves (fork heads): form a sliding pair with the cross shaft journal, with the inner surface usually cast with a friction-reducing alloy (such as Babbitt alloy), and the outer surface connected to the flange. 3. Flange connection: connected to the drive shaft or equipment by high-strength bolts, providing a reliable torque transmission interface. 4. Lubrication and sealing: uses grease lubrication (lithium-based grease or molybdenum disulfide lithium-based grease), labyrinth seals or felt ring seals to prevent oil leakage and intrusion of external impurities, ensuring long-term operational reliability.
Classification
1. By structural form:
- Single-section SWC type: suitable for occasions where the angle between two shafts is small (usually ≤3°~5°).
- Double-section (with intermediate shaft) SWC type: connects two coupling sections through an intermediate shaft, compensating for larger angular deviations (the yellow products arranged in the picture represent the double-section structure), suitable for larger shaft angles or long-distance transmission scenarios.
2. By material:
- Cast steel material: high strength, lower cost, suitable for general working conditions (such as ZG35Ⅱ, ZG45).
- Forged steel material: superior mechanical properties, suitable for heavy load and frequent impact conditions (such as 42CrMo, 40CrNiMo).
3. By function:
- Fixed type (e.g., SWC100B): no axial expansion compensation function.
- Telescopic type (e.g., SWC120BH): equipped with a spline structure, can compensate for axial displacement (the yellow coupling part in the picture has a spline sleeve).
Applicable scope
1. Heavy machinery: mining crushers, ball mills, scraper conveyors; rolling mills and continuous casting machines in the metallurgical industry.
2. Lifting and transportation equipment: tower cranes, gantry cranes, slewing mechanisms and luffing mechanisms of port machinery; belt conveyor drive devices.
3. Construction machinery: travel mechanisms and working device drives of excavators, loaders, bulldozers.
4. Ships: main propulsion systems, auxiliary machinery drives, rudder systems.
5. Other fields: large fans, compressors, pumps, and other equipment requiring flexible connection transmission.
Working principle
1. Torque transmission: the rotational motion of the driving shaft is transmitted to the driving bearing sleeve through the flange, then through the cross shaft to the driven bearing sleeve, finally driving the driven shaft.
2. Displacement compensation:
- Angular displacement: when there is an angle between two shafts, the ends of the cross shaft perform complex planar movements (swinging + sliding) inside the bearing sleeves, compensating angular displacement by changing the contact position between the cross shaft journal and the bearing sleeve (the intermediate shaft of the double-section coupling in the picture is used to compensate for large angles).
- Axial displacement: the spline sleeve of the telescopic SWC coupling (e.g., SWC120BH) slides relative to the spline shaft, compensating for axial movement.
- Radial displacement: small radial deviations are absorbed through the radial clearance and elastic deformation of the cross shaft and bearing sleeves.
3. Lubrication and friction reduction: grease forms an oil film between the cross shaft journal and the inner surface of the bearing sleeve, reducing friction and wear, and lowering operating temperature.
SWC Type Cross Shaft Directional Coupling Model Parameter Table
Model |
Maximum allowable torque (kN·m) |
Maximum allowable speed (r/min) |
Maximum angular compensation (°) |
Shaft hole diameter range (mm) |
Flange specification (hole diameter × quantity) |
Weight (kg) |
SWC100B |
20
|
3000
|
±3.5 |
30~80 |
M12×4/Φ90 |
35
|
SWC120BH |
40
|
2500
|
±4.0 |
50~120 |
M16×6/Φ110 |
60
|
SWC140B |
80
|
2000
|
±4.5 |
80~160 |
M20×8/Φ140 |
110
|
SWC250 |
500
|
1200
|
±5.0 |
200~320 |
M36×12/Φ260 |
320
|
SWL200 |
150
|
1800
|
±4.0 |
120~200 |
M24×10/Φ200 |
180
|
Keywords
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SWC Type Cross Shaft Directional Linkage
The SWC type cross-shaft universal coupling is a high-performance mechanical transmission component, mainly used in transmission systems where two shafts intersect (neither parallel nor coplanar). It achieves torque transmission through the precise fit of the cross shaft and bearing sleeve, and can effectively compensate for axial, radial, and angular displacement between the two shafts. This series of couplings features a compact structure, high load capacity, high transmission efficiency, and strong reliability, and is widely used in heavy machinery transmission systems in industries such as mining, hoisting, metallurgy, construction machinery, shipbuilding, and chemical engineering.
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