| 摘要 |
The disclosure includes a method and apparatus for determining the maximum variation of the rolling radius and the slip angle during each turn of an automotive tire rotating under load. In the method, the tire under test and a rigid surface having an axis parallel to the tire axis are brought into contact and are mutually compressed by application of an elastic pressure, the cylindrical surface being capable of oscillating about at least one axis lying in its median plane and disposed perpendicular to the axis of the cylindrical surface; the tire and the cylindrical surface are oppositely rotated by controlling the rotation of one or the other; and the angular displacements of the axis of the cylindrical surface about the axis of oscillation, which are caused by variations of the lateral thrust during each turn of the tire in the zone of contact between the tire and the adjacent surface, are then determined. The apparatus comprises a rigid cylinder rotatable about an associated shaft and capable of oscillating about an axle lying in its median plane and disposed perpendicular to the shaft. Such apparatus also includes an element adapted to produce elastic compression between the tire and cylinder and means for determining the angular displacements of the axis of the shaft about the axis of oscillation, which displacements are caused by variations of the lateral thrust which occurs during each turn of the tire in the region of contact between the cylinder and tire as they are oppositely rotated. |
