| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain a structure capable of keeping, in a high dimension, both of: the decrease in weight of an outer diameter side orbital ring member 3b and the securement of the strength and rigidity of a base end part of a rotational flange 12; and the securement of the form accuracy and dimensional accuracy of respective fitting holes 15a. <P>SOLUTION: A radial-direction inner end part of the axial-direction inner side surface of the rotational flange 12 and an axial-direction outer end part of a recessed part 17 formed in an outer peripheral surface of the outer diameter side orbital ring member 3b are smoothly continued by a recessed and curved surface 19b having a cross sectional arc shape. The diameter D of the outer peripheral edge of the recessed and curved surface 19b is specified to be a diameter R of an inscribed circle of the respective fitting holes 15a or below. Reinforcing ribs 25 are respectively provided in positions sandwiching the fitting holes 15a and 15a from both sides in the circumferential direction, in a part between the radial-direction inner end part of the axial-direction inner side surface of the rotational flange 12 and the axial-direction outer end part of the recessed part 17 of the outer peripheral surface of the outer diameter side orbital ring member 3b. <P>COPYRIGHT: (C)2012,JPO&INPIT |
