| 摘要 |
A shock-absorbing member 18a comprises combined held sections 33 that are located at a plurality of locations in the circumferential direction and that comprise paired held sections 25a, 25b, and is constructed so as to have a non-circular cylindrical shape in the cross section by arranging portions where outer-diameter side end sections of the held sections 25a, 25b that are adjacent to each other in the circumferential direction are made continuous by way of outer-diameter side cover sections 31, and portions where inner-diameter side end sections of the held sections 25a, 25b that are adjacent to each other in the circumferential direction are made continuous directly or by way of inner-diameter side cover sections 32, in an alternating sequence in the circumferential direction. Drive-side arm sections 21a are placed between the paired held sections 25a, 25b, driven-side arm sections 23a are placed between the combined held sections 33, and the outer circumferential surfaces of the drive-side arm sections 21a are covered by the outer-diameter side cover sections 31. |
