Henan Yizhi Machinery Co., Ltd
Focus on transmission parts and drive your mechanical system better
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1) Description of Helical gears
Helical gears contain special teeth that are placed at a particular angle to the shaft. This leads to more
than one tooth being in touch during the function, making the gear capable of tolerating more load.
This configuration also allows helical gears to perform quieter and smoother than spur gears because
of the load sharing between teeth.
| Products | Helical Gears |
| Custom Made | √ |
| Material | 20CrMnTi |
| Gear Teeth manufacturing | Gear Hobbing |
| Gear Teeth Grinding | √ |
| Module | 2 |
| Pressure Angle (α) | 20° |
| Helix Angle (β) | 20° |
| Teeth Accuracy Grade | ISO 7 Grade/ AGMA 11Grade |
| Heat Treatment | Carburizing |
| 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 | |
