Tire testing device

A tire testing device comprising:

• a road surface;
• and
• a carriage configured to rotatably hold a test wheel on which a test tire is mounted and traveling along the road surface in a state where the test tire is made to contact the road surface, wherein
• the carriage includes:
• an axle part that rotatably supports the test wheel,
• an alignment part configured to adjust wheel alignment of the test wheel by changing orientation of the axle part, and
• a main frame having an alignment mechanism support part that accommodates the alignment part;
• the alignment part includes a load adjusting part configured to adjust load acting on the test wheel by changing a height of the axle part;
• the load adjusting part includes:
• a first movable frame supported to be movable up and down,
• a linear guide that guides up-and-down movement of the first movable frame, and
• a first driver that drives the first movable frame up and down;
• the alignment part includes a camber adjusting part configured to adjust a camber angle of the test wheel;
• the camber adjusting part includes:
• a second movable frame supported so as to be rotatable about an Eφ axis parallel to a traveling direction of the carriage,
• a φ driver that rotationally drives the second movable frame about the Eφ axis,
• a cylindrical first pivot disposed coaxially with the Eφ axis, and
• a first bearing that rotatably supports the first pivot;
• one of the first pivot and the first bearing is fixed to the second movable frame;
• the other of the first pivot and the first bearing is fixed to the first frame;
• the camber adjusting part includes a curved guide that guides rotation of the second movable frame;
• the curved guide includes:
• an arc-shaped curved rail disposed concentrically with the Eφ axis, and
• a second traveling part configured to travel on the curved rail;
• one of the curved rail and the second traveling part is fixed to the second movable frame;
• the alignment mechanism support part, the first movable frame, and the second movable frame each have a substantially inverted U-shaped cross section when cut along a plane orthogonal to a rotation axis of the test wheel;
• the linear guides are between inner sides of the substantially inverted U-shape of the alignment mechanism support part and outer sides of the substantially inverted U-shape of the first movable frame so that the first movable frame is sandwiched by the linear guides;
• and
• the curved guides are between the inner sides of the substantially inverted U-shape of the first movable frame and the outer sides of the substantially inverted U-shape of the second movable frame so that the second movable frame is sandwiched by the curved guides.