| 摘要 |
A lightweight wave gear device has a similar engagement rigidity, tooth surface hardness, and abrasion resistance as when a ferrous material is used. A cup-shaped wave gear device 1 has a rigid internal gear 2 that is formed of a lightweight alloy, such as an aluminum alloy, and internal teeth 21 are formed with a height that is 1.1 to 1.3 times the height used for internal gears that are made of a ferrous material. A hard, electrolessly plated coating is also formed on the tooth surface 21a of the internal teeth 21. By doing so, a lightweight wave gear device can be obtained with a similar engagement rigidity, tooth surface strength, and abrasion resistance to a wave gear device that has a rigid internal gear formed of a ferrous material.
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