| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gear having relatively high accuracy and rotation stability. <P>SOLUTION: The gear attached to a shaft includes: a first rim including an outer peripheral surface at which teeth are formed; an attachment part attached to the shaft; a first annular rib arranged between the first rim and the attachment part; a first rib element which is radially arranged between the first rim and the first annular rib, and includes a plurality of ribs for connecting the first rim and the first annular rib; and a second rib element which is radially arranged between the attachment part and the first annular rib, and includes a plurality of ribs for connecting the attachment part and the first annular rib. The first rib element includes a larger number of the ribs than those of the second rib element. <P>COPYRIGHT: (C)2012,JPO&INPIT |
