| 摘要 |
PROBLEM TO BE SOLVED: To provide structure capable of facilitating every of component manufacture, component management and assembling work, capable of reducing a cost easily, and capable of stabilizing a shifting operation.SOLUTION: An outer ring 16c of a thrust rolling bearing is constituted to engage a recessed part 24 provided on an outer face of the outer ring 16c with a cylindrical convex face of a support beam part of a trunnion, and is thereby supported to allow a swing displacement. A tapered groove 27 formed along a circumferential direction with the support beam part as the center, and having an opening part of wide width and a bottom part of narrow width, is engaged with a tapered protrusion formed on an outer face of the support beam part, and having a base part of wide width and a tip part of narrow width, on an inner face of the recessed part 24, to limit the displacement of the outer ring 16c as to an axial direction of the support beam part. Further, a step difference part 34 is provided in an outer-face outer circumferential edge part of the outer ring 16c, to serve as a reference face when carrying out finishing work on outer circumferential faces of the recessed part 24, the recessed groove 27, an outer ring raceway track 17, and a support shaft 12a. |
