| 摘要 |
PROBLEM TO BE SOLVED: To provide a synthetic resin-made worm wheel improved in strength of a tooth part by reduction of the weight and the size, and excellent in durability.SOLUTION: A worm wheel 21 comprises: an annular core metal 22 made of metal; and a plurality of synthetic resin-made tooth parts 23 integrally formed on an outer periphery of the core metal 22 and arranged in equal intervals in a circumferential direction. The synthetic resin-made tooth part 23 includes a first molded part 24 formed of a first synthetic resin material with no reinforced fiber, and a second molded part 25 integrally formed with the first molded part by a second synthetic resin material mixed with the reinforced fiber. The second molded part 25 is arranged in an inside of the first molded part 24, and extends in a radial direction of the core metal like a plate. |
