Technical Data Drive chain Roller Chain Selection
12. Temperature Selection Method
12.1 RS Roller Chain temperature selection method
Allow for chain strength degradation from temperature.
Lubrication should be carried out using a suitable lubricant according to the operating temperatures.
・Problems with roller chain transmission at high temperatures
- 1. Increased wear due to hardness reduction
- 2. Increased elongation due to softening
- 3. Poor articulation and increased wear due to oil degradation and carburization
- 4. Increased wear and poor articulation due to scaling
・Problems with roller chain transmission at low temperatures
- 1. Reduction of impact strength due to low temperature brittleness
- 2. Solidification of lubricant or deterioration of fluidity
- 3. Poor articulation due to frost and ice adhesion
| Temperature | RS roller chain | Cold resistant roller chain | |
|---|---|---|---|
| RS60 or under | RS80 or over | ||
| Below –60℃ | - | - | Cannot be used |
| –60℃ to –50℃ | - | - | catalog value × 1/2 |
| –50℃ to –40℃ | - | Cannot be used | catalog value × 2/3 |
| –40℃ to –30℃ | Cannot be used | catalog value × 1/4 | catalog value |
| –30℃ to –20℃ | catalog value × 1/4 | catalog value × 1/3 | catalog value |
| –20℃ to –10℃ | catalog value × 1/3 | catalog value × 1/2 | catalog value |
| –10℃ to 60℃ | catalog value | catalog value | catalog value |
| 60℃ to 150℃ | catalog value | catalog value | catalog value |
| 150℃ to 200℃ | catalog value × 3/4 | catalog value × 3/4 | Cannot be used |
| 200℃ to 250℃ | catalog value × 1/2 | catalog value × 1/2 | - |
| Over 250℃ | Cannot be used | Cannot be used | - |
- Note) 1. Select using allowable load selection method.
- 2. The ambient temperature is different from the temperature of the roller chain itself. We recommend selection based on the roller chain’s temperature.
12.2 Lambda Chain KF Series selection method
Use the general selection method based on kilowatt ratings tables.
Allow for chain strength degradation from temperature.
Multiply the values in the lube-free drive chain kilowatt ratings table by the coefficients below.
Use a chain speed lower than the allowable speed shown in the table of dimensions and specifications for lube-free drive chains.
| Temperature | Transmission Capacity |
|---|---|
| 150℃ to 200℃ | catalog value x 3/4 |
| 200℃ to 230℃ | catalog value x 1/2 |
12.3 Selection method for Stainless Steel Roller Chain (SS and NS series) at high temperatures (400℃ or higher)
As the temperature of a chain increases, its strength decreases. The usage limit at high temperatures is determined by the temperature of the chain itself.
Contact a Tsubaki representative when using stainless steel chain at ambient temperatures of 400℃ or higher. However, chain cannot be used at 700℃ or higher.
When a chain is selected using the temperature selection method, the chain speed must be below 50 m/min.
The speed of chains having a pitch of 57.15 mm or greater must not exceed the upper limit speed determined under the Allowable Load Selection Method.
Cautions associated with high-temperature environments are:
- 1.All clearances need to be adjusted to prevent poor articulation and poor roller rotation due to thermal expansion.
- 2.The chain may break (creep rupture) under low loads as the temperature increases.
