technical data Synchronous Belts and Belt Sprockets Selection
Synchronous Belts correction factor
Table 1. Load correction factor Ko
| Ratio of maximum load output to rated output of prime mover | ≦200% | 201%～249% | 250%≦ | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Daily driving time h | ＜3 | 3～10 | 10＜ | ＜3 | 3～10 | 10＜ | ＜3 | 3～10 | 10＜ | |
| Load classification and Usage examples |
Smooth transmission Examples: measuring equipment, medical equipment, mixers, etc. |
1.2 | 1.3 | 1.4 | 1.3 | 1.4 | 1.4 | 1.4 | 1.5 | 1.6 |
| Transmission with some shock Examples: injection molding machines, machine tools, conveyors, pumps, etc. |
1.3 | 1.4 | 1.5 | 1.4 | 1.5 | 1.6 | 1.5 | 1.6 | 1.7 | |
| Transmission involving large shocks Examples: robots, high-speed presses, intermittent drive conveyors, etc. |
1.4 | 1.5 | 1.6 | 1.6 | 1.6 | 1.7 | 1.7 | 1.7 | 1.8 | |
In the case of transmission involving extremely severe shock, a coefficient of 1.8 or higher may be used, so please contact us for details.
Table 2. Correction factor Ki when using an idler
| Idler use position | Inside | outside |
|---|---|---|
| Loose side of belt | 0 | +0.1 |
| Belt tension side | +0.1 | +0.2 |
Table 3. Acceleration correction factor Ks
| Speed increase ratio | Correction Factor |
|---|---|
| 1以上1.25未満 | 0 |
| 1.25以上1.75未満 | +0.2 |
| 1.75以上2.5未満 | +0.3 |
| 2.5以上3.5未満 | +0.4 |
| 3.5 or higher | +0.5 |
Table 4. Start-stop frequency correction factor Ka
| Number of starts and stops per day | ≦10 | 11～100 | 101～999 | 1000≦ | |
|---|---|---|---|---|---|
| Relative to the rated output of the motor Percentage of maximum output |
≦200% | 1.2 | 1.3 | 1.4 | 1.5 |
| 201%～249% | 1.3 | 1.4 | 1.5 | 1.6 | |
| 250%≦ | 1.4 | 1.6 | 1.7 | 1.8 | |
Table 5. Belt length correction factor KL
| Type (pitch) | Belt length mm | |||||||
|---|---|---|---|---|---|---|---|---|
| ≦200 | 201～300 | 301～450 | 451～600 | 601～900 | 901～1300 | 1301～1800 | 1801≦ | |
| P2M | 0.8 | 0.9 | 1.0 | 1.1 | 1.2 | 1.2 | 1.2 | 1.2 |
| P3M・UP3M | 0.8 | 0.9 | 1.0 | 1.1 | 1.2 | 1.2 | 1.2 | 1.2 |
| P5M・UP5M | - | 0.8 | 0.8 | 0.9 | 1.0 | 1.1 | 1.2 | 1.2 |
| P8M・UP8M | - | - | 0.8 | 0.8 | 0.9 | 1.0 | 1.1 | 1.2 |
| P14M・UP14M | - | - | - | - | - | 0.9 | 1.0 | 1.1 |
Table 6. Meshing correction factor Km
| Number of meshing teeth of pinion Zm | 6 or more | 5 | 4 |
|---|---|---|---|
| Meshing correction factor | 1.0 | 0.7 | 0.5 |
Note: If the number of meshing teeth between the belt and pulley does not meet the following conditions, reconsider the layout.
- - For prime mover pulleys, the meshing angle must be 120° or more and the number of meshing teeth must be 6 or more.
- - For driven pulleys, the meshing angle must be 90° or more and the number of meshing teeth must be 6 or more.
