Tire testing device
A tire testing device includes a road surface, and a carriage configured to rotatably hold a test wheel and traveling along the road surface. The carriage includes an alignment part configured to adjust wheel alignment of the test wheel. The alignment part includes a load adjusting part configured to adjust load acting on the test wheel. The load adjusting part includes a first movable frame movable up and down, a linear guide that guides the movement of the first movable frame, and a first driver that drives the first movable frame up and down. One of a rail and a traveling part of the linear guide is fixed to the first movable frame. The carriage includes a main frame having an alignment mechanism support part that accommodates the alignment part. The other of the rail and the traveling part is fixed to the alignment mechanism support part.
1 . 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, and
an alignment part configured to adjust wheel alignment of the test wheel by changing orientation of the axle 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,
linear guides that guide up-and-down movement of the first movable frame, and
a first driver that drives the first movable frame up and down;
the linear guides include:
a rail, and
a traveling part configured to travel on the rail;
one of the rail and the traveling part is fixed to the first movable frame;
the carriage includes a main frame having an alignment mechanism support part that accommodates the alignment part;
the other of the rail and the traveling part is fixed to the alignment mechanism support part;
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 E φ axis parallel to a traveling direction of the carriage, and
a φ driver that rotationally drives the second movable frame about the E φ axis;
the camber adjusting part includes curved guides that guide rotation of the second movable frame;
the curved guide includes:
an arc-shaped curved rail disposed concentrically with the E φ 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.
2 . The tire testing device according to claim 1 , wherein
the camber adjusting part includes:
a cylindrical first pivot disposed coaxially with the E φ axis, and
a first bearing that rotatably supports the first pivot; and
one of the first pivot and the first bearing is fixed to the second movable frame.
3 . The tire testing device according to claim 2 ,
wherein the other of the first pivot and the first bearing is fixed to the first movable frame.
4 . The tire testing device according to claim 1 , wherein
the alignment part includes a slip angle adjusting part configured to adjust a slip angle of the test wheel; and
the slip angle adjusting part includes:
a third movable frame supported to be rotatable about an E θ axis orthogonal to each of an E λ axis being a rotation axis of the test wheel and the E φ axis, and
a θ driver that rotationally drives the third movable frame about the E θ axis.
5 . The tire testing device according to claim 4 , wherein
the slip angle adjusting part includes:
a cylindrical second pivot disposed coaxially with the E θ axis, and
a second bearing that rotatably supports the second pivot; and
one of the second pivot and the second bearing is fixed to the third movable frame.
6 . The tire testing device according to claim 1 ,
wherein the axle part includes:
a spindle;
a third bearing that rotatably supports the spindle; and
a wheel hub coaxially attached to a distal end portion of the spindle and to which the test wheel is to be attached.
7 . 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 E φ axis parallel to a traveling direction of the carriage,
a φ driver that rotationally drives the second movable frame about the E φ axis,
a cylindrical first pivot disposed coaxially with the E φ 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 E φ 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.
8 . The tire testing device according to claim 7 , wherein
the linear guide includes:
a rail, and
a traveling part configured to travel on the, rail; and
one of the rail and the traveling part is fixed to the first movable frame.
9 . The tire testing device according to claim 8 , wherein
the other of the rail and the traveling part is fixed to the alignment mechanism support part.
10 . The tire testing device according to claim 7 , wherein
the alignment part includes a slip angle adjusting part configured to adjust a slip angle of the test, wheel; and
the slip angle adjusting part includes:
a third movable frame supported to be rotatable about an E θ axis orthogonal to each of an E λ axis being a rotation axis of the test wheel and the E φ axis, and
a θ driver that rotationally drives the third movable frame about the E θ axis.
11 . The tire testing device according to claim 10 , wherein
the slip angle adjusting part includes:
a cylindrical second pivot disposed coaxially with the E θ axis, and
a second bearing that rotatably supports the second pivot; and
one of the second pivot and the second bearing is fixed to the third movable frame.
12 . The tire testing device according to claim 7 ,
wherein the axle part includes:
a spindle;
a third bearing that rotatably supports the spindle; and
a wheel hub coaxially attached to a distal end portion of the spindle and to which the test wheel is to be attached.