Bearing testing machine

1. A bearing testing machine, comprising:

a testing machine shaft to which at least one test piece being a bearing is attached, the testing machine shaft being a rotation shaft extending in a Y axis direction, the Y axis direction being a horizontal direction;

a rotational driving unit configured to rotate the testing machine shaft;

a test piece holding unit configured to elastically hold the at least one test piece; and

at least one axle driving unit configured to slide the testing machine shaft in a Z axis direction and in an X axis direction, the Z axis direction being a vertical direction and the X axis direction being a horizontal direction orthogonal to the Y axis direction.

2. The bearing testing machine according to claim 1 , wherein the at least one axle driving unit comprises a bearing unit configured to rotatably support the testing machine shaft.

3. The bearing testing machine according to claim 2 , wherein the bearing unit comprises:

a testing machine bearing that rotatably supports the testing machine shaft; and

a hinge mechanism that supports the testing machine bearing to be swingable around an X axis.

4. The bearing testing machine according to claim 2 , wherein the at least one axle driving unit comprises:

a driving table;

a Z axis driving unit configured to drive the driving table in the vertical direction;

an XY axis sliding mechanism that couples the driving table with the Z axis driving unit to be slidable in the X axis direction and the Y axis direction;

an X axis driving unit configured to drive the driving table in the X axis direction;

an YZ axis sliding mechanism that couples the driving table with the X axis driving unit to be slidable in the vertical direction and the Y axis direction; and

an Z axis rotation mechanism that couples the driving table with the bearing unit to be swingable around a vertical axis.

5. The bearing testing machine according to claim 4 , wherein the at least one axle driving unit comprises:

a Y axis driving unit configured to drive the driving table in the Y axis direction; and

a ZX axis sliding mechanism that couples the driving table with the Y axis driving unit to be slidable in the vertical direction and the X axis direction.

6. The bearing testing machine according to claim 1 , wherein the test piece holding unit comprises:

a shaft box that holds the at least one test piece; and

an elastic member that applies a load acting in the vertical direction to the shaft box.

7. The bearing testing machine according to claim 6 , wherein the at least one axle driving unit comprises a pair of axle driving units.

8. The bearing testing machine according to claim 7 , wherein the at least one test piece comprises a first test piece and a second test piece which are attached to one end and the other end of the testing machine shaft, respectively,

wherein the shaft box comprises:

a first shaft box holding the first test piece; and

a second shaft box holding the second test piece,

wherein the elastic member comprises:

a first elastic member applying a load acting in the vertical direction to the first shaft box; and

a second elastic member applying a load acting in the vertical direction to the second shaft box,

wherein the pair of the axle driving units comprise:

a first axle driving unit configured to drive the testing machine shaft on a first shaft box side; and

a second axle driving unit configured to drive the testing machine shaft on a second shaft box side.

9. The bearing testing machine according to claim 6 , further comprising a frame part that supports one end of the elastic member, wherein the other end of the elastic member is fixed to the shaft box.

10. The bearing testing machine according to claim 6 , wherein the elastic member is a coil spring.