Turning device and rotary machine

A turning device comprising:

• a casing;
• a driving motor which is attached to be positioned higher than the casing;
• a driving wheel which is disposed above the casing, is supported on one side with respect to a reference plane that is parallel to a vertical direction on a driving shaft of the driving motor and, to be rotatable around a reference line that intersects the reference plane, and is rotated by the driving motor;
• a driven wheel which is disposed in the casing, is supported to be rotatable around an axis that is parallel to the reference line, and is connected to the driving wheel via an annular member;
• a first toothed wheel which is coaxially connected to the driven wheel and has first spur teeth;
• a second toothed wheel having second spur teeth that engage with each of a wheel gear that is provided coaxially with a rotary shaft which extends parallel to the reference line, and the first spur teeth of the first toothed wheel;
• an arm member which rotatably supports the second toothed wheel;
• a moving mechanism which moves the second toothed wheel between an engagement position where the second toothed wheel engages with the wheel gear and a retreat position where the second toothed wheel does not engage with the wheel gear, by moving the arm member;
• and
• a cover which is attachable to and detachable from the casing and covers the driving wheel,
• wherein a compressor is connected to the rotary shaft on the other side with respect to the reference plane.