| 摘要 |
A reduction gear is shown, which is designed to facilitate assembly of essential parts in a case. The reduction gear comprises a worm; a worm wheel meshed with the worm; a lower case part having a semicylindrical recess which rotatably receives the worm, and an upper case part to be mounted on the lower case part to close the semicylindrical recess. The semicylindrical recess has an opening which is so sized as to permit insertion of the worm into the semicylindrical recess therethrough. A threaded bore is formed in the lower case part, which is merged and aligned with the semicylindrical recess. A bolt is screwed into the threaded bore having its inside end pressed against one axial end of the worm for achieving a stable rotation of the worm in the semicylindrical recess.
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