Abstract: An electromagnetic connection device includes an armature (4), a rotor (3), an electromagnetic coil (14), and a spring member (24) that biases the armature (4) in a direction in which the armature (4) is separated from the rotor (3). The electromagnetic connection device includes a damping member (25) mounted on the armature (4) so as to face the rotor (3). The armature (4) includes a flat portion (22) and a tubular portion (8). The damping member (25) includes a damper cover (26) including an abutment portion along the flat portion (22) and an engaging portion along the tubular portion (8), and an elastic member (27) sandwiched between the abutment portion and the flat portion (22). The damper cover (26) is put on the armature (4) from the side of the rotor (3) and movably held on the tubular portion (8). The flat portion (22) includes a concave portion (35) configured to store the abutment portion of the damper cover (26).

Abstract: A seal structure for an electromagnet lead wire includes an annular yoke including an annular groove, a wiring hole configured to pass a lead wire of an exciting coil, an insulating resin configured to seal the exciting coil, and a seal member arranged in the hole. The wiring hole includes a though hole of a case, and a concave portion of the yoke. The insulating resin includes a projecting portion whose distal end face is located in the concave portion. The seal member includes a columnar portion inserted into the though hole, and a flange portion located in the concave portion. The flange portion is sandwiched and compressed between the device inner surface of the case and the distal end face of the insulating resin.

Abstract: A seal structure for an electromagnet lead wire includes an annular yoke including an annular groove, a wiring hole configured to pass a lead wire of an exciting coil, an insulating resin configured to seal the exciting coil, and a seal member arranged in the hole. The wiring hole includes a though hole of a case, and a concave portion of the yoke. The insulating resin includes a projecting portion whose distal end face is located in the concave portion. The seal member includes a columnar portion inserted into the though hole, and a flange portion located in the concave portion. The flange portion is sandwiched and compressed between the device inner surface of the case and the distal end face of the insulating resin.

Abstract: An electromagnetic connection device includes an armature (4), a rotor (3), an electromagnetic coil (14), and a spring member (24) that biases the armature (4) in a direction in which the armature (4) is separated from the rotor (3). The electromagnetic connection device includes a damping member (25) mounted on the armature (4) so as to face the rotor (3). The armature (4) includes a flat portion (22) and a tubular portion (8). The damping member (25) includes a damper cover (26) including an abutment portion along the flat portion (22) and an engaging portion along the tubular portion (8), and an elastic member (27) sandwiched between the abutment portion and the flat portion (22). The damper cover (26) is put on the armature (4) from the side of the rotor (3) and movably held on the tubular portion (8). The flat portion (22) includes a concave portion (35) configured to store the abutment portion of the damper cover (26).

Abstract: An electromagnetic clutch includes a rotor, armature hub, armature, magnetic body and first permanent magnet, field core, excitation coil, and second permanent magnet. The rotor is rotatably disposed in the housing of a driven device. The armature hub is fixed to the rotating shaft of the driven device, the armature movable in an axial direction. The magnetic body is incorporated in the rotor. The first permanent magnet connects the armature to the rotor. The field core is attached to the housing and inserted in the rotor to be in noncontact with it. The excitation coil is disposed in the field core and excited, when cutting off power transmission, to cancel a magnetic force of the first permanent magnet, thus releasing the armature from the first permanent magnet. The second permanent magnet separates the armature from the rotor, when cutting off power transmission, to move the armature toward the armature hub.

Abstract: An electromagnetic clutch including a driving rotating body, driven rotating body, armature, and field core. The driving rotating body receives power transmitted from a driving device via a driving power transmission member. The driven rotating body is arranged coaxially with the driving rotating body, and mounted on a driven device to rotate integrally with the driven device. The armature is opposed to the end face of the driving rotating body in the axial direction, and supported by the driven rotating body via spring members to integrally rotate with the driven rotating body. The field core magnetically attracts the armature to the driving rotating body. One end of each of the spring members is fixed to the armature. The other end of each of the spring members is held by the driven rotating body so as to be removed upon being applied with a tensile force.

Abstract: An electric fuel pump includes a pump unit, motor unit, fuel discharge unit, stator holder, magnet wire, connection terminal, first mold resin, driver board assembly, and second mold resin. The fuel discharge unit includes a discharge port member and discharges fuel supplied from the pump unit through the motor unit. The stator holder is provided to the motor unit and includes a partition which defines the motor unit and the fuel discharge unit. The partition includes a terminal insertion hole and a fuel passage. The connection terminal is connected to the magnet wire. The driver board assembly is stored in a space formed in the discharge port member and electrically connected to the connection terminal. The second mold resin molds the driver board assembly and a connecting portion where the driver board assembly is connected to the connection terminal.

Abstract: An electromagnetic clutch includes a rotor, armature hub, armature, magnetic body and first permanent magnet, field core, excitation coil, and second permanent magnet. The rotor is rotatably disposed in the housing of a driven device. The armature hub is fixed to the rotating shaft of the driven device. The armature is disposed on the armature hub to be movable in an axial direction. The magnetic body is incorporated in the rotor. The first permanent magnet connects the armature to the rotor. The field core is attached to the housing and inserted in the rotor to be in noncontact with it. The excitation coil is disposed in the field core and excited, when cutting off power transmission, to cancel a magnetic force of the first permanent magnet, thus releasing the armature from the first permanent magnet. The second permanent magnet separates the armature from the rotor, when cutting off power transmission, to move the armature toward the armature hub.

Abstract: An electric fuel pump includes a pump unit, motor unit, fuel discharge unit, stator holder, magnet wire, connection terminal, first mold resin, driver board assembly, and second mold resin. The motor unit drives the pump unit. The fuel discharge unit includes a discharge port member and discharges fuel supplied from the pump unit through the motor unit. The stator holder is provided to the motor unit and includes a stator support which supports a stator of a motor and a partition which defines the motor unit and the fuel discharge unit. The partition includes a terminal insertion hole and a fuel passage. The magnet wire is wound around a core of the stator. The connection terminal is connected to the magnet wire. The first mold resin molds the core and a connecting portion where the magnet wire is connected to the connection terminal. The driver board assembly is stored in a space formed in the discharge port member and electrically connected to the connection terminal.