Henan Yizhi Machinery Co., Ltd
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1) Description of Double Helical Gear
A gear with both left hand and right hand helcial teeth called double helical gear.
2) Feature of Double Helical Gear
The double helcial gear from balances the inherent thrust forces
3) Heat Treatment of Double Helical Gear
Quenching and Tempering heat treatment is widely used for double helcial gear.
Carburizing heat treatement can also considered for double helcial gear if the gear need gear profle grinding.
| Products | Double Helical Gear |
| Custom Made | √ |
| Gear Profile Type | Cylindrical Gear |
| Gear Teeth manufacturing | Gear Grinding |
| Gear Teeth Grinding | √ |
| Module (M) | 4 |
| Number of Teeth (Z) | 43&77 |
| Pressure Angle (α) | 20° |
| Helix Angle (β) | 31° |
| Teeth Accuracy Grade | ISO 6-7 Grade |
| 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 | |
