Motion guide device, relative motion system and displacement absorbing mechanism

A motion guide device for guiding linear or curvilinear motion of a moving body relative to a base, comprising:

• a raceway rail having a bottom surface, side surfaces and an upper surface and being mounted on one of the base and the moving body;
• a moving block having a center portion facing the upper surface of the raceway rail and side wall portions facing the side surfaces of the raceway rail and being mounted linearly movable relative to the raceway rail;
• and
• a displacement absorbing mechanism provided between a side surface of the moving block and an opposite one of the base and the moving body,
• wherein a space is provided over at least a part of an upper surface of the moving block in such a manner that the opposite one of the base and the moving body mounted onto the mounting member is apt to be displaced toward the upper surface of the moving block.

A relative motion system having a base and a moving body linearly or curvilinearly movable relative to the base, comprising:

• the moving body having a wall surface;
• a base having a wall surface facing the wall surface of the moving body;
• a motion guide device, provided between the wall surface of the moving body and the wall surface of the base, for guiding linear or curvilinear motion of the moving body relative to the base;
• and
• a driving source for the linear or curvilinear motion of the moving body relative to the base,
• the motion guide device having
• a raceway rail having a bottom surface, side surfaces and an upper surface and being mounted on one of the base and the moving body;
• a moving block having a center portion facing the upper surface of the raceway rail and side wall portions facing the side surfaces of the raceway rail and being mounted linearly movable relative to the raceway rail;
• and
• a displacement absorbing mechanism provided on a side surface of the moving block, the displacement absorbing mechanism having a mounting member mounted on an opposite one of the base and the moving body, and a displacement absorbing portion which is fixed to the mounting member and which is shear-deformed when the mounting member is displaced in a direction crossing an upper surface of the moving block.