Abstract: It is an object of the present invention to provide a rear wheel steering device of which the weight is not added to unsprung weight, and which can steer right and left rear wheels independently of each other. The rear wheel steering device includes a first rod connected to the left rear wheel, a first driving portion configured to axially move the first rod, a second rod connected to the right rear wheel, and a second driving portion configured to axially move the second rod. A single housing supports the first rod, the first driving portion, the second rod, and the second driving portion.

Abstract: It is an object of the present invention to provide a rear wheel steering device of which the weight is not added to unsprung weight, and which can steer right and left rear wheels independently of each other. The rear wheel steering device includes a first rod connected to the left rear wheel, a first driving portion configured to axially move the first rod, a second rod connected to the right rear wheel, a second driving portion configured to axially move the second rod; and a single housing supporting the first rod, the first driving portion, the second rod, and the second driving portion.

Abstract: In a cube space having high rigidity, the following members are provided: a die holder (103) which can be pulled out forward, a punch holder (47) fixed to a separate bridge structure, a striker which can be positioned in an XY plane for selecting a desired punch P, a striker supporting frame (59) which can be positioned in the XY plane for selecting a desired punch P and which can slide in a horizontal direction, and a clamp device (232) having clamp arms (233) which are provided with a vertically movable ram (37) and which can enter between the punch holder (47) and the die holder (103) and which hold the opposed ends of the workpiece W. Therefore, it is possible to constitute a punch press (1) which is suitable for precise machining of a thin plate and in which tools can easily be exchanged.

Abstract: First and second radial magnetic bearings are provided at opposing ends of a rotary shaft, first and second protective bearings are arranged in the vicinity thereof, a third radial magnetic bearing is arranged on a side of a fan near a motor, and by the third radial magnetic bearing, negative spring element of the motor is corrected.

Abstract: In a cube space having high rigidity, the following members are provided: a die holder (103) which can be pulled out forward, a punch holder (47) fixed to a separate bridge structure, a striker which can be positioned in an XY plane for selecting a desired punch P, a striker supporting frame (59) which can be positioned in the XY plane for selecting a desired punch P and which can slide in a horizontal direction, and a clamp device (232) having clamp arms (233) which are provided with a vertically movable ram (37) and which can enter between the punch holder (47) and the die holder (103) and which hold the opposed ends of the workpiece W. Therefore, it is possible to constitute a punch press (1) which is suitable for precise machining of a thin plate and in which tools can easily be exchanged.

Abstract: First and second radial magnetic bearings are provided at opposing ends of a rotary shaft, first and second protective bearings are arranged in the vicinity thereof, a third radial magnetic bearing is arranged on a side of a fan near a motor, and by the third radial magnetic bearing, negative spring element of the motor is corrected.