Cooling pipe joint for motor cooling and motor cooling device provided with cooling pipe joint

A cooling pipe joint which receives a cooling pipe through which a coolant passes for cooling a motor, comprising:

• a base part having:
• a first surface;
• a second surface opposite the first surface;
• and
• a first through hole which extends through the base part between the first surface and the second surface, and which receives the cooling pipe;
• a fastening member fastened to the base part, the fastening member extending along an axis and having:
• a third surface defining one terminal end of the fastening member;
• a fourth surface opposite the third surface and defining the other terminal end of the fastening member, the fastening member extending along the axis from the one terminal end to the other terminal end, the third surface facing away from the fourth surface and toward the base part;
• and
• a second through hole which extends axially through the fastening member between the third surface and the fourth surface, the second through hole communicating with the first through hole and receiving the cooling pipe,
• the first surface being in contact with the third surface when the fastening member is fastened to the base part;
• a deforming member arranged between the base part and the fastening member, the deforming member having a third through hole which communicates with the first through hole and the second through hole and which receives the cooling pipe;
• and
• a first slanted surface arranged to face the deforming member and slanting with respect to a center axis of the third through hole, the first slanted surface pressing against the deforming member so as to deform the deforming member in a direction approaching the center axis by a force for fastening the fastening member to the base part, wherein
• the base part, the fastening member, and the deforming member are fabricated from metals having the same rigidity and the same coefficient of thermal expansion.