The difference between hard-toothed surface reducers and soft-toothed surface reducers
2021-12
1. The gears of hard-toothed reducers have a hardness greater than 350 HBS, and both gears feature a hardened tooth surface. These reducers are commonly used in gear transmissions that require high load-carrying capacity and compact size.
2. The soft tooth surface has a hardness of 350 HDS. In a pair of gears, at least one gear must have a soft tooth surface; this type is primarily used in ordinary medium- and low-speed gear drives that do not require high precision.
The following points are typically considered during design:
1. The closed gear drive of a hardened-tooth-surface reducer shall be designed based on the bending fatigue strength at the tooth root.
2. The open gears in hard-toothed surface reducers rotate. The primary failure modes are tooth surface wear or gear tooth fracture. Therefore, when designing such reducers, the impact of wear on the hard-toothed surface must also be taken into account.
3. Under normal operating conditions, based on the tooth surface contact fatigue strength and taking the reducer’s contact strength as the primary consideration, design a steel gear transmission with a soft tooth surface hardness of no more than 350 HB.
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