Technical Data Drive chain Chain selection
7. Lifting transmission examples
There are many examples of where chain is used for lifting.
By making use of Roller Chain features, choosing the right chain, and following some important points, it is possible to use Roller Chain for lifting transmissions.
Typical lifting applications are illustrated below. (Please give special consideration to safety devices. )
Balancing
Lifting equipment (1)
Lifting equipment (2)
Lifting equipment (3)
Precautions for When Selecting Roller Chain for Lifting Applications
1. Regulations
If there are any laws or guidelines for chain selection, check and calculate accordingly. Make sure to follow the allowable load selections and select the safer of the two selections.
2. Connecting links
Use F-type (press-fit) connecting links. Offset links cannot be used.
3. Lubrication
Remove as much as possible the load that acts on the chain joints before lubing the chain. Sufficient lubrication is also required at end fittings (end bolts and connecting links, etc.) and connecting parts.
Weight required for counterweight to prevent sprocket tooth-jumping when using Roller Chain in lifting transmission applications
Tk = To × {sinΦ / sin(Φ + 2α)} K-1
- Tk：Minimum weight tension (minimum back-tension )
- To：Roller Chain tension
- Φ：Sprocket minimum pressure angle Φ = 17°- 64° Z
- 2α：Sprocket dividing angle 2α = 360° Z
- K：Engaging no. of teeth K = θ 360 × Z ...Round up to the nearest whole number to be safe.
If To = 10.8 kN {1100 kgf}, Z = 13T, and θ= 120°, then
- Φ = 17° - 64° Z = 17° - 64° 13 = 12.077
- 2α = 360° Z = 360° 13 = 27.692
- K = θ 360° × Z = 120° 360° × 13 = 4.33 ... K = 4
- Tk = 1100 × {sin12.077 / sin(12.077 + 27.692)} 4-1 = 38.5(kg)
Accordingly, tooth-jumping will not occur if a 39 kg weight is used.
However, this will change depending on the layout and amount of wear on the Roller Chain and sprocket teeth. Please use the above as a reference.
