| 摘要 |
PROBLEM TO BE SOLVED: To reduce axial force applied on a trunnion by forming the outer peripheral surface of an outer roller in a shape in which a cylindrical surface part and a spheroidal projection surface part are continued to each other smoothly, and specifying the boundary positions of the cylindrical surface part and the spheroidal projection surface part. SOLUTION: A part held by a chamfering part 17 on the outer peripheral surface 16 of an outer roller 12 is formed in a shape in which a cylindrical surface part 18 formed from the top end side of a trunnion to a base end side, and a spheroidal projection surface part 19 whose curvature radius R19 is formed on the base end are continued to each other in a boundary 24 smoothly. A straight line passed the curvature center point O24 of the spheroidal recessed surface 20 formed on the inner circumferential surface of the outer roller 12, and which is journalled to the center axial line 21 of the outer roller 12 is formed as a first straight line 22, a straight line for connecting the center point O20 and the boundary 24 to each other on the same flat surface 4 as the first straight line 22 is formed as a second straight line 25, and the inclining angleγi of the straight lines 25, 22 is set to 0 deg.<γi <11 deg.. It is thus possible to reduce axial force applied to the trunnion, and it is also possible to reduce vibration in the case where an operation is carried out in a joint angle-applied condition.
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