Want to optimize your mechanical transmission efficiency?
Discover the typical empirical values used in the industry and improve your machine’s performance. Read on to learn more.
| Mechanical transmission efficiency table | ||
| category | drive system | efficiency |
| Cylindrical gear transmission | Gear transmission with good running-in accuracy of Level 6 and Level 7 (thin oil lubrication) | 0.98~0.99 |
| General gear transmission with 8-level accuracy (thin oil lubrication) | 0.97 | |
| Gear transmission with class 9 accuracy (thin oil lubrication) | 0.96 | |
| Open gear transmission for machining teeth (dry oil lubrication) | 0.94~0.96 | |
| Open gear transmission with cast teeth | 0.90~0.93 | |
| bevel gear drive | Good running-in precision gear transmission with grades 6 and 7 (thin oil lubrication) | 0.97~0.98 |
| General gear transmission with 8-level accuracy (thin oil lubrication) | 0.94~0.97 | |
| Open gear transmission for machining teeth (dry oil lubrication) | 0.92~0.95 | |
| Cast tooth open gear transmission | 0.88~0.92 | |
| worm drive | Self-locking worm | 0.40~0.45 |
| Single head worm | 0.7~0.75 | |
| Double headed worm | 0.75~0.82 | |
| Three-head and four-head worm | 0.8~0.92 | |
| Circular arc surface worm drive | 0.85~0.95 | |
| Belt drive | Open drive with flat belt without compression wheel | 0.98 |
| Open drive with flat compression wheel | 0.97 | |
| Flat belt cross drive | 0.90 | |
| V-belt drive | 0.96 | |
| Synchronous toothed belt drive | 0.96~0.98 | |
| Chain drive | Welded chain | 0.93 |
| Piece joint chain | 0.95 | |
| Roller chain | 0.96 | |
| Silent chain | 0.97 | |
| sliding bearing | Poor lubrication | 0.94 |
| Normal lubrication | 0.97 | |
| Lubrication characteristic d (pressure lubrication) | 0.98 | |
| Liquid friction | 0.99 | |
| Rolling bearing | Ball bearing (thin oil lubrication) | 0.99 |
| Roller bearing (thin oil lubricated d) | 0.98 | |
| Friction drive | Flat friction drive | 0.85~0.92 |
| Slot friction drive | 0.88~0.90 | |
| Rope reel | 0.95 | |
| coupling | Floating coupling | 0.97~0.99 |
| Toothed coupling | 0.99 | |
| Elastic coupling | 0.99~0.995 | |
| Universal coupling（ α≤ 3°） | 0.97~0.98 | |
| Universal coupling（ α> 3°） | 0.95~0.97 | |
| Quincunx shaft | 0.97~0.98 | |
| Hydraulic coupling (at design point) | 0.95~0.98 | |
| Complex pulley block | Sliding bearing (i=2~6) | 0.98~0.90 |
| Rolling bearing (i=2~6) | 0.99~0.95 | |
| Winch drum | 0.94~0.97 | |
| Decelerator | Single stage cylindrical gear reducer | 0.97~0.98 |
| Double stage cylindrical gear reducer | 0.95~0.96 | |
| Single stage planetary cylindrical gear reducer | 0.95~0.96 | |
| Single stage planetary cycloid pin wheel reducer | 0.90~0.97 | |
| Single stage bevel gear reducer | 0.95~0.96 | |
| Double stage conical cylindrical gear reducer | 0.94~0.95 | |
| Continuously variable transmission | 0.92~0.95 | |
| Rolling mill herringbone gear seat (sliding bearing) | 0.93~0.95 | |
| Rolling mill herringbone gear seat (rolling bearing) | 0.94~0.96 | |
| Rolling mill main reducer (including main coupling and motor coupling) | 0.93~0.96 | |
| Lead screw drive | Sliding lead screw | 0.3~0.6 |
| Rolling lead screw | 0.85~0.95 | |
