Henan Yizhi Machinery Co., Ltd
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1) Description of double helical gear
Double helical gear is a special type of helical gear.
The teeth are twisted oblique to the gear axis and with both left hand and right hand helical teeth.
2) Features of double helical gear
The double helical form balances the inherent thrust froces.
The gear set must have the same helix angle.
2) Applications of double helical gear
Heavey duty industry need to remove the thrust froces. Gearbox
| Products | Double Helical Gear |
| Custom Made | √ |
| Gear Profile Type | Cylindrical Gear |
| Gear Teeth manufacturing | Gear Milling |
| Gear Teeth Grinding | √ |
| Module (M) | Custom Made |
| Number of Teeth (Z) | 97 |
| Pressure Angle (α) | 20° |
| Helix Angle (β) | 13° |
| Teeth Accuracy Grade | ISO 8-9 Grade |
| Heat Treatment | Quenching & Tempering |
| Surface Hardness | 260-300HB |
| 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 | |
