Cardan Shaft (Required by NFPA)
The cross-type cardan shaft utilizes its structural characteristics to enable two shafts that are not on the same axis, have a large angular misalignment, or have significant axial movement to operate continuously at constant angular velocity. Its greatest features are strong displacement compensation capability in all directions, compact structure, high transmission efficiency, and easy maintenance. Heavy-duty cardan shafts are suitable for metallurgical machinery, heavy machinery, petroleum machinery, engineering machinery, and lifting/transport machinery, etc.Product series include JB5513-91 (SWC type), JB3241-91 (SWP type), JB/T3242-93 (SWZ type), WxD type, WX type, WSP type, etc. They can also be designed and manufactured according to users’ different special requirements.
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Advantages of Cardan Shaft
It features strong displacement compensation capability in all directions, enabling continuous operation at constant angular velocity even when connected shafts have large angular misalignment or significant axial movement.
With a compact structure, high transmission efficiency, and easy maintenance, it delivers reliable performance while reducing operational and upkeep costs.
It is suitable for heavy-duty applications in metallurgical, petroleum, engineering, and lifting machinery. It also supports custom design and manufacturing to meet users’ special requirements.
It maintains constant angular velocity between driving and driven shafts, ensuring smooth, stable power transfer even under misaligned conditions.
It offers flexible installation options, including Z-type (for parallel shafts) and W-type (for intersecting shafts), and its coupling models support a wide range of applicable shaft diameters, making it easy to match with different connected shafts.
Selection of Cardan Shafts
- A cardan shaft consists of two universal joints and one intermediate shaft. For the driving and driven shafts to have
equal angular velocity, i.e., ω1=ω2, the following three conditions must be met:
★The node inclination angle between the intermediate shaft and the driven shaft is equal, i.e., β1=β2.
★The fork heads at both ends of the intermediate shaft are in the same phase.
★The centerlines of the driving shaft, driven shaft, and intermediate shaft lie in the same plane. - The installation form of the cardan shaft, according to the relative position of its axes, is generally divided into Z-type
(two shafts parallel) and W-type (two shafts intersecting). - Cardan shafts should be based on load characteristics, calculated torque, bearing life, and operating speed.
Calculated torque is determined by the following formulas
Tc=KT T=9550×Pw/n T=7020×PH/n
| Where: T —— Theoretical torque N·m Pw —— Drive power kW n —— Operating speed r/min Tc —— Calculated torque N·m Pn —— Drive power Horsepower |
K is the service factor, its value is shown in the table below (this coefficient is also applicable to clutch selection). Based on calculated torque, shaft diameter, speed, etc., and the conditions below, the coupling model and structural dimensions can be selected from relevant manuals. |
Tc≤[T] n≤nmax
Where: [T] is the allowable torque (N·m) of the selected coupling
- Where: [T] is the allowable torque (N·m) of the selected coupling;
n is the speed (r/min) of the connected shafts;
n_max is the maximum allowable speed (r/min) of the selected coupling. - In most cases, each coupling model has a range of applicable shaft diameters. The standardprovides either the maximum and minimum shaft diameters or a series of applicable diameters.
The two connected shafts should fall within this range. Generally, the diameters of the two
connected shafts are different, and the shapes of the two shaft ends may also differ.
Work situation coefficient K
| Working Mechanism Load characteristics | Equipment Name | K |
|---|---|---|
| Light Impact Load | Generators, Centrifugal Pumps, Ventilators, Woodworking Machines Belt Conveyors, Paper Machines |
1.1~1.65 |
| Moderate Impact load | Compressor (multi-cylinder), piston pump (multi-plunger), small section steel rolling mill, continuous wire rod mill, main drive for transport machinery | 1.65~2.5 |
| Heavy Impact Load | Marine Drives, Transport Roller Table Continuous Tube Mills, Type 75 Medium Section Rolling Mill, Compressors (Single-Cylinder), Piston Pumps (Single-Plunger), Mixer Press,Straightening Machine Crane Main Drive, Ball Mill | 2.5~3.5 |
| Extra Heavy Impact Load | Crane Auxiliary Transmission, Crusher,Reversible Work Roll stand, Coiler, Scale Breaker, Blooming Mill | 3.5~7 |
| Extremely Heavy Impact Load | Stand Roller Table Heavy Plate Shearing Machine, Reversible Slab Rolling Mill | 7~15 |
PumpMac Cardan Shaft
This list including all models of PumpMac NFPA20 Components.
Click here to find pump engines by type (Fuel System & Engine Speed).
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