Henan Yizhi Machinery Co., Ltd
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Transmission Gears 10 Module Internal Ring Gear Annular Gear For Planetary Gear System
1) Applications of Internal Gear
The most popular application for internal gears is usage for planetary gear trains or gear reducers composed of a carrier,
several spur gears, called planet gears and a sun gear in the center, rotating inside an internal gear.
2) Description of Internal Gear
Internal Gears are gear teeth generated in the internal diameter of a cylinder while external gears
have the gear teeth generated on the outside diameter of the component.
| Products | Internal Gear |
| Custom Made | √ |
| Gear Profile Type | Cylindrical Gear |
| Gear Teeth manufacturing | Gear Shaping |
| Gear Teeth Grinding | If needed |
| Module (M) | Custom |
| Number of Teeth (Z) | Custom |
| Pressure Angle (α) | Custom |
| Helix Angle (β) | Custom |
| Teeth Accuracy Grade | ISO 8-9 Grade |
| Heat Treatment | Quenching & Tempring/ Induction Hardening |
| Hardness | 230-260 HB |
| 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 | |
