Three Planet Gears Epicyclic Gear Train Of Coal Mining Machine
1) Description of Epicyclic Gear Train
Epicyclic gearing or planetary gearing is a gear system consisting
of one or more outer, or planet, gears or pinions, revolving about
a central sun gear or sun wheel.
Typically, the planet gears are mounted on a movable arm or
carrier, which itself may rotate relative to the sun gear.
Epicyclic gearing systems also incorporate the use of an outer ring
gear or annulus, which meshes with the planet gears. P
lanetary gears (or epicyclic gears) are typically classified as
simple or compound planetary gears.
2) Advantage of Planetary Gearbox
Planetary gear trains provide high power density in comparison to
standard parallel axis gear trains.
They provide a reduction in volume, multiple kinematic
combinations, purely torsional reactions, and coaxial shafting.
Disadvantages include high bearing loads, constant lubrication
requirements, inaccessibility, and design complexity.
| Products | Gear Box/ Gear Reducer |
| Custom Made | √ |
| Gear Profile Type | Helical Gear/ Double Helical Gear |
| Gear Teeth manufacturing | Gear Hobbing/ Gear Grinding |
| Gear Teeth Grinding | √ |
| Module (M) | Custom |
| Number of Teeth (Z) | Custom |
| Pressure Angle (α) | 20°/ 14.5° |
| Helix Angle (β) | Custom |
| Teeth Accuracy Grade | ISO 6-7 Grade |
| Heat Treatment | Carburizing/Cement Quenching/Nitriding |
| Surface Hardness | 58-62 HRC |
| STEEL CODE GRADES COMPARISON |
| CHINA/GB | ISO | ГΟСТ | ASTM | JIS | DIN |
| 45 | C45E4 | 45 | 1045 | S45C | CK45 |
| 40Cr | 41Cr4 | 40X | 5140 | SCr440 | 41Cr4 |
| 20CrMo | 18CrMo4 | 20ХМ | 4118 | SCM22 | 25CrMo4 |
| 42CrMo | 42CrMo4 | 38XM | 4140 | SCM440 | 42CrMo4 |
| 20CrMnTi | | 18XГT | | SMK22 | |
| 20Cr2Ni4 | | 20X2H4A | | | |
| 20CrNiMo | 20CrNiMo2 | 20XHM | 8720 | SNCM220 | 21NiCrMo2 |
| 40CrNiMoA | | 40XH2MA/
40XHMA | 4340 | SNCM439 | 40NiCrMo6/
36NiCrMo4 |
| 20CrNi2Mo | 20NiCrMo7 | 20XH2MA | 4320 | SNCM420 | |
