How to select Cardan shaft?

 

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Quality Assurance Plan Advantage & Features Selection of Cardan Shaft Selection Chart / Speed Limit Infrastructure Brochure

 

  According to standard, use the following methods to select CIW-X, CIW-Y and CIW-Z series Cardan Shaft. Please consult use for selecting other product series.

1. Universal Joint Shaft are selected according to the load features, calculated torques, bearing life and operating speed.
2. Tha calculated torque is acquired from Formulas (1), (2) or (1), (3).

Table 10 : Service Factors K

Service Factor Type Driven Equipment K Light Shock Load Generators
Centrifugal Purpose
Ventilators
Wood Handling Machines
Belt Conveyors
Paper Machines 1.1 to 1.3 Medium Shock Load Compressor (Multi-Cyl.)
Pumps (Multi- Cyl.)
Small Section Mills
Continuous Wire Mills
Conveyor Primary Drives 1.3 to 1.8 Heavy Shock Load Marine Transmission
Transport Roller Tables
Continuous Tube Mills
Continuous Working Roller Tables
Medium Section Mills
Compressors (Single-Cyl.)
Pumps (Single-Cyl.)
Mixers
Presses
Straightening Machines
Crane Drives
Ball Mills 2 to 3 Extra Heavy Shock Load Crane Accessory Drives
Crushers
Reversing Working Roller Tables
Reeling Drives
Scale Breakers
Blooming Stands 3 to 5 Extreme Shock Load Feed Roller Drives
Plate Shears 6 to 15

3. Generally, universal joint shafts are selected according to the torque to be transmitted an required bearing life. They can also be selected checking their torque strengths or bearing life relation to the requirements of the applied equipment.
4. Checking the torsional strength using Formula
   Tc < Tn or Tc < Tf or Tc < Tp ...................... (4)
   Where,
   TC=Calculate torque, Nm
   Tn=Nominal torque, NM (i.e. a theoretic calculated value under these pre-determined conditions;
   speed of shaft n=30 rpm, deflected angle B = 3o , and a bearing life.
   Ln= hours under even load,
   Tf=Permissible torque according to the fat strength under alternating loads, Nm
   Tp=Permissible torque according to the fat strength under pulsating loads, Nm
   Tp=1.45 Tt

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Most cardan shafts have been standardized or standardized. The designer's task is to choose, not design. The basic steps for selecting a coupling are as follows:

Select the type of Cardan shaft:

According to the size of the transmitted load, the speed of the shaft, the installation accuracy of the two parts to be connected, etc., refer to the characteristics of various couplings and select a suitable coupling type.

1) The size and nature of the torque to be transmitted and the requirements for the buffer and vibration reduction function. For example, for high-power and heavy-duty transmissions, gear couplings can be used; for transmissions that require severe impact loads or to eliminate shaft torsional vibration, tire couplings and other couplings with high elasticity can be selected.

2) The working speed of the Cardan shaft and the centrifugal force caused by it. For high-speed transmission shafts, couplings with high balance accuracy, such as diaphragm couplings, should be used, rather than eccentric slider couplings.

3) The magnitude and direction of the relative displacement of the two axes. When it is difficult to maintain strict and precise alignment of the two shafts after installation and adjustment, or when the two shafts will have a large additional relative displacement during the working process, a flexible coupling should be used. For example, when the radial displacement is large, you can choose a slider coupling, and when the angular displacement is large or the connection of two intersecting shafts, you can choose a universal coupling.

4) The reliability and working environment of the Cardan shaft. Generally, couplings made of metal elements that do not require lubrication are more reliable; couplings that require lubrication are easily affected by the degree of lubrication and may pollute the environment. Couplings containing non-metallic components such as rubber are sensitive to temperature, corrosive media and strong light, and are prone to aging.

5) Due to reasons such as manufacturing, installation, load-deformation, and temperature changes, it is difficult to maintain strict and precise alignment of the two shafts after installation and adjustment. There is a certain degree of displacement in the X and Y directions and the deflection angle CI. When the radial displacement is large, you can choose a slider coupling, and when the angular displacement is large or the connection of two intersecting shafts, you can choose a universal coupling. When the two shafts produce a large additional relative displacement during the working process, a flexible coupling should be used.

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