| 摘要 |
A wheel construction 10 includes a wheel rim 11 which in use receives a tyre 14, the rim 11 having axially inner and outer portions 16, 15, and a mid-portion 18 between them, and each axially inner and outer portion 16, 15 providing a flange 22, a connecting surface 23 adjoining the flange 22 and extending axially towards the mid portion 18, the flange 22 and a part of the connecting surface 23 providing a seat for a bead of the tyre 14, and there being a side part 19, 20 between the connecting surface 23 and the mid portion 18, and wherein for at least one of the inner and outer portions 16, 15, the connecting surface 23 is a frusto-conical having an axial end 24 of greatest radius and an axial end 25 of least radius, the connecting surface 23, at its axial end of greatest radius 24, adjoining the flange 22, and the axial end 25 of least radius adjoining a circumferentially extending convex surface 26 which extends radially outwardly of the wheel axis A beyond the end 25 of least radius of the adjoining frusto-conical connecting surface 23, and the side part 19, 20 of the at least one of the axially inner and outer portions 16, 15 including a generally frusto-conical region 28 and a curved region 40, the curved region 40 including first and second axially spaced circumferentially extending concave surfaces 41, 42, and the curved region 40 adjoining the end of least radius of the frusto-conical region 28 and the mid-portion 18. |
