Cylinder device, pressmachine, workpiece clamping apparatus, cylinder device actuating method, method for pressing workpiece, and method for clamping workpiece

A cylinder device comprising:

• a cylinder;
• an output-side housing disposed in the cylinder and movable in the cylinder in a thrust direction;
• an input-side housing fixed to an input side of the output-side housing and including a second fluid chamber in which a part of an inner surface is formed of a lid on one side and a lid on the other side in the thrust direction, and a fixing mechanism portion of which an outer circumferential surface expands in a radial direction due to an increase in pressure of the second fluid chamber and is fixed to the cylinder;
• an air hydraulic mechanism disposed in the output-side housing and outputting a thrust by an amplified fluid pressure in a state of being fixed by the fixing mechanism portion;
• a second pneumatic chamber to which air is supplied;
• a second piston portion which receives air pressure of the second pneumatic chamber to move the input-side housing and the output-side housing to an output side, and pressurizes and expands the second fluid chamber at a predetermined position;
• and
• distance fixing means for fixing a distance between the lid on the one side and the lid on the other side.