| 摘要 |
<P>PROBLEM TO BE SOLVED: To stably rotate a gear without causing vibrations and unevenness for a long time. <P>SOLUTION: A plurality of through holes 12 are formed in a gear 1. A first groove 14 is formed in one face of the gear 1 toward a radially outward direction of the gear 1 from the through hole 12. A first side wall 14a of the first groove 14 is inclined to a downstream direction in a rotating direction by an angle α with respect to a straight line L connecting the centers of the gear 1 and through hole 12. A second groove 15 is formed on the other face of the gear 1 toward a radially outward direction of the gear 1 from the through hole 12. A second side wall 15a of the second groove 15 is inclined to an upstream direction in a rotating direction by an angle β with respect to the straight line L connecting the centers of the gear 1 and through hole 12. When the gear 1 rotates, lubricant not shown in the figure is circulated by moving to a tooth part 13 along the first side wall 14a of the first groove 14, to the through-hole 12 from the tooth part 13 along the second side wall 15a of the second groove 15 and to the first groove 14 through the through-hole 12. <P>COPYRIGHT: (C)2011,JPO&INPIT |
