Research Article
A New Study on the Parameter Relationships of Planetary Roller Screws
Table 1
List of the parameters used in the present study.
| Parameter | Symbol | Unit | Value |
| Effective diameter of screw (right hand) | | mm | 30 | Starts | | | 5 | Pitch | p | mm | 2 | Helix angle | |
°
| 6.056 | Contact angle | |
°
| 45 | Effective diameter of roller (right hand) | | mm | 10 | Effective diameter of nut (right hand) | | mm | 50 | External diameter of nut thread | | mm | 51.2 | Tooth number of the roller thread | | | 20 | Number of rollers | | | 10 | Orbital diameter of roller | | mm | 40 | Radius of effective ball | | mm | 7.0711 | Rolling coefficient of friction | | | 0.005 | Sliding coefficient of friction | | | 0.05 | Loss coefficient of energy | | | 0.007 | Young’s modulus | | Pa | 210 × 109 | Poisson’s ratio | | | 0.3 |
|
|