Device for measuring the uniformity of a vehicle tire

A device for measuring uniformity of a vehicle tire (1) comprising:

• a holding device (2) for holding the vehicle tire (1), the holding device (3) being mounted via differential force sensors (3);
• a roller (5) mounted such that the roller (5) rotates on radial bearings (9) about an axis, the roller being supported along the axis by force measuring cells (11) via de-coupled axial bearings, the force measuring cells (11) measure axial forces acting on the roller (5);
• and
• a frame (4) for supporting the roller (5), the roller (5) being able to be brought into contact with the vehicle tire (1) by displacement on the frame (4) normal to the axis. The measurements by the axial force measuring cells are separate and independent of the measurements by the differential measuring sensors of the measuring hub.

A device for measuring the uniformity of a vehicle tire, comprising:

• a tire holding mechanism supporting a tire for rotation about a tire axis,
• a measuring hub mounted to a fixed frame and supporting the tire holding mechanism, wherein
• the measuring hub includes a plurality of differential measuring sensors for measuring fire forces along a plurality of axes due to rotation of the tire,
• a rotatingly driven roller mounted on a roller axis parallel with the tire axis wherein
• the roller is supported by a sliding carriage moveable perpendicular to the tire and roller axes of rotation to Bring the rotating roller into contact with the tire to drive the rotation of the tire, and includes
• axial force measuring cells mounted on an axial bearing to measure axial forces acting on the roller due to rotation of the tire, wherein
• the measurements by the axial force measuring cells are separate and independent of the measurements by the differential measuring sensors of the measuring hub.