Henan Yizhi Machinery Co., Ltd
Focus on transmission parts and drive your mechanical system better
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1) Description of Double Helix Gears
A double helical gear consists of two helix angles with opposite hands. Inside the gears, the axial thrusts
oppose each other and the resulting forces are not transmitted to the bearings on the shaft. This gear
pair setup means they can handle high loads and allow for a solid transmission while running.
2) Features of Double helix Gears
Double helical gears have all of the advantages of helical gears, which are strong and quiet, plus have
the advantage of being able to cancel the thrust forces by combining helical gears with both right and
left hand twists. On the other hand, they have the disadvantage of being difficult to manufacture.
Double helical gears and herringbone gears are the same type of gear, but those with a groove in the
center are called double helical gears, while those without a groove where the left and right teeth meet
in the center, are called herringbone gears
| 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) | 53 |
| Pressure Angle (α) | 20° |
| Helix Angle (β) | 31° |
| Teeth Accuracy Grade | ISO 7 Grade |
| Heat Treatment | Carburizing |
| 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 | |
