Abstract: A damper device that suppresses arc discharge between electrodes generated by bubbles in an electro-rheological fluid, includes an inner tube housed in an outer tube forming an outer shell of a damper device. An electrode tube is arranged between the outer tube and the inner tube. An electro-rheological fluid is sealed in the outer tube. The inner tube and the electrode tube constitute a cathode and an anode, respectively, and apply a voltage to the electro-rheological fluid located between the inner tube and the electrode tube. An insulating layer is provided on a surface of the electrode tube on a side facing the inner tube or on a surface of the inner tube on a side facing the electrode tube. When a maximum voltage applied to the electro-rheological fluid is Vmax (V), a thickness t (m) of the insulating layer is set to satisfy Formula (1).

Abstract: The present invention provides a socket adapter 10 for an impact wrench to prevent a manipulator ring 60 from being intentionally slid, the socket adapter comprising: a main body 11 including a cylinder section 20 having an engagement hole 21 to be installed in an insertion square 90 of the impact wrench, a shank section 40 configured to attach or detach a socket 80, and a drum section 30 positioned between the cylinder section and the shank section; a ball locking mechanism 50 adapted to switch the socket between a locked state where the socket cannot be detached and an unlocked state where the socket can be attached and detached by protrusion and retraction of a ball 51 housed in the shank section; a manipulator ring 60 slidably fitted on the drum section in the axial direction and configured to control the protrusion and retraction of the ball; and a starting resistance imparting means 70 for increasing the starting resistance of the manipulator ring when the manipulator ring begins to slide from a locking

Abstract: The solenoid coil includes a coil having a first end surface and a second end surface on its both ends in an axial direction, a member which is in contact with the first end surface, and has a groove through which the wire material of the coil passes, and an insulating resin formed to coat at least an outer circumferential surface and the second end surface of the coil. The resin with a substantially U-shaped section is continuously coated on at least a part of an inner circumferential surface of the coil via an area from the outer circumferential surface to the second end surface.

Abstract: A cylinder device including: a piston rod having a piston; a first electrode that constitutes an inner cylinder and into which the piston rod is inserted; a second electrode that constitutes an outer cylinder and is provided so as to face an outer peripheral surface of the first electrode; a base shell that houses the first electrode and the second electrode; an electroviscous fluid sealed inside the base shell; and a voltage application unit that applies a voltage between the first electrode and the second electrode, and an outer surface insulation layer is provided on an outer peripheral surface of the second electrode. Thus, it is possible to prevent deposition of particles in a region where the electroviscous fluid sealed in the cylinder device is low in speed, and to suppress deterioration of the damping characteristics of the cylinder device.

Abstract: A damper device that suppresses arc discharge between electrodes generated by bubbles in an electro-rheological fluid, includes an inner tube housed in an outer tube forming an outer shell of a damper device. An electrode tube is arranged between the outer tube and the inner tube. An electro-rheological fluid is sealed in the outer tube. The inner tube and the electrode tube constitute a cathode and an anode, respectively, and apply a voltage to the electro-rheological fluid located between the inner tube and the electrode tube. An insulating layer is provided on a surface of the electrode tube on a side facing the inner tube or on a surface of the inner tube on a side facing the electrode tube. When a maximum voltage applied to the electro-rheological fluid is Vmax (V), a thickness t (m) of the insulating layer is set to satisfy Formula (1).

Abstract: An intermediate cylinder is disposed between an outer cylinder and an inner cylinder. The intermediate cylinder forms a passage between the inner cylinder and itself, through which a hydraulic fluid as an electrorheological fluid flows. The intermediate cylinder is supplied (applied) with a voltage through an electrode connector. The intermediate cylinder includes a ring member. The ring member is provided with an extending portion which extends toward the outer cylinder. The extending portion of the ring member is inserted with an electrode pin as an imparting unit for imparting a voltage to the intermediate cylinder.

Abstract: An intermediate cylinder is disposed between an outer cylinder and an inner cylinder. The intermediate cylinder forms a passage between the inner cylinder and itself, through which a hydraulic fluid as an electrorheological fluid flows. The intermediate cylinder is supplied (applied) with a voltage through an electrode connector. The intermediate cylinder includes a ring member. The ring member is provided with an extending portion which extends toward the outer cylinder. The extending portion of the ring member is inserted with an electrode pin as an imparting unit for imparting a voltage to the intermediate cylinder.