[Object] To provide a solenoid with which, when attaching an iron core to a yoke, the iron core can be easily and firmly attached using an inexpensive, small, and general-purpose hand tool without crimping the iron core using a large press machine.

[Solution] A solenoid of the present invention is configured to include a yoke having a U-shaped cross section, a bobbin having an electromagnetic coil disposed inside the yoke, a fixed iron core disposed inside the bobbin, and a flapper attached to the yoke to be able to swing freely. The fixed iron core and a bottom surface of the yoke are integrally coupled by threaded fitting. Thus, the fixed iron core can be easily attached to the bottom surface of the yoke using a general-purpose, inexpensive, and small hand tool (a hand drill or an electric driver) without requiring a large workplace for crimping the fixed iron core as in the related art.

An electric component assembly includes a housing with which an electric component is fitted together, and the electric component and the housing are fixed to one side of a base body. The electric component includes a connecting terminal configured to be press-fitted in a through-hole of the control board of the housing, and a direction in which the connecting terminal is inserted into the through-hole is same as a fitting direction relative to the housing. There are provided a rib protruding from one of the electric component and the housing, and a groove portion recessed from another one of the electric component and the housing and into which the rib is press-fitted. Movement of the electric component in a direction intersecting the fitting direction and rotation of the electric component around an axis parallel to the fitting direction are restrained by the rib press-fitted into the groove portion.

The actuator (10) comprises a body (12) formed by a single strip of ferromagnetic material, U-shaped and including a first and a second lateral branch (14, 16) facing each other and interconnected by an intermediate branch or portion (18). A first lateral branch (14) of the body (12) has a frustoconical formation (30) which extends in the region outside the body (12). A coil (22) is fixed in the body (12), and its axis (A-A) extends in a direction essentially orthogonal to the lateral branches (14, 16) of this body (12). A ferromagnetic core (28) is mounted so as to be translatable inside the coil (22), from a rest position to a working position, as an effect of the energizing of the coil (22). One end (32) of the core (28), facing towards the first branch (14) of said body (12), has a frustoconical shape essentially complementary to the internal shape (30b) of the formation (30). The frustoconical formation (30) of the first branch (14) of said body (12) is blind and has a planar distal bottom wall (30a).

An electromagnet and method for producing an electromagnet. The electromagnet includes a sheet metal casing encompassing a magnetic coil at its end face on a magnetic pole side and extends into an interior of the magnetic coil and forms, in this case, a magnetic pole which interacts with a magnet keeper. The electromagnet enables actuation of a valve, a coupling or a reciprocating pump. The structure is achieved with as few cutting processes as possible to be used for generating the individual parts and as small a number as possible of individual parts is to be used per electromagnet.

An electromagnetic actuator having a unitary pole piece arranged within and coupled to a housing is provided. The housing is coupled to the unitary pole piece such that a load on the unitary pole piece is reduced during assembly and/or installation of the electromagnetic actuator. The unitary pole piece is structured to reduce leakage past an armature slidably received within the pole piece.

A hydraulic control device includes: a plurality of coil assembles each including a coil bobbin, and a yoke which has a cylindrical shape, and which receives the coil bobbin; a case including a bottom wall, and receiving the coil assemblies arranged on one side of the bottom wall; a wall portion protruding from an end surface of the coil bobbin in an axial direction of the coil bobbin, within a projection surface obtained by projecting an outer shape of the yoke in the axial direction of the coil bobbin; a first engagement portion provided to the wall portion; and a second engagement portion provided to the case, and arranged to be engaged with the first engagement portion.

Provided according to the present invention is a solenoid with a built-in permanent magnet, with which it is possible to suppress an increase in the amount of magnetic flux that passes through the chuck part, even when the magnetic flux generated by a coil is greater than the magnetic flux of the magnet, and to reliably reduce attraction force. In this solenoid, a permanent magnet and a coil are both built into a cylindrical case having an opening part; the permanent magnet and the coil are both separated and arranged inside the case; a ring member is arranged adjacent to the permanent magnet; a movable iron core is inserted inside the coil; and between the movable iron core and the coil, a metal coil cover is provided so as to cover the coil. The distance d between the case inner wall and the ring member can also be in the range of 0.1-0.3 mm.

The present invention relates to a bobbin and a coil assembly and electromagnet equipment including the same, and the electromagnet equipment, which includes a bobbin and a coil, includes a coil assembly receiving a refrigerant so as to remove heat produced when magnetic field lines are famed by an electric current running through the coil while the coil is wound on a center shaft relative to the center shaft provided on a center of the bobbin; and a terminal block provided on a lower side of the coil assembly, the terminal block supporting the coil assembly and receiving a refrigerant from outside and supplying the refrigerant to the coil assembly.

The present invention discloses a moving iron core guide mechanism for an HVDC relay, comprising a pushrod, an upper section of the pushrod being located above a yoke plate and fixed with a moving contact assembly, a middle section and a lower section of the pushrod passing through the yoke plate downward, the middle section of the pushrod being fixed with a moving iron core; the moving iron core is located inside a magnetic conductive cylinder of a U-shaped yoke; a lower bushing is fixed inside the magnetic conductive cylinder, and the lower bushing is located below the moving iron core; a lower guide hole running from top to bottom is formed on the lower bushing; and the lower section of the pushrod is always fitted inside the lower guide hole of the lower bushing, and the pushrod is in smooth contact with an inner wall of the lower guide hole. In the present invention, the up-and-down motion of the moving iron core and the pushrod can become easier while the turns of the coil can be maintained; and the production cost can be reduced when the moving iron core and the pushrod are in normal use.

A solenoid includes a coil portion, a yoke having a cylindrical portion and a bottom portion and accommodating the coil portion, a plunger configured to slide in an axial direction, a stator core. The stator core has a magnetic attraction core, and a sliding core having a cylindrical core portion, a first magnetic flux transfer portion configured to transfer a flux between the yoke and the core portion, and a magnetic flux passage suppressing portion configured to suppress passage of magnetic flux between the sliding core and the magnetic attraction core. A second magnetic flux transfer portion is arranged on a radial outside of the magnetic attraction core end portion and transfers the magnetic flux between the magnetic attraction core and the cylindrical portion. The first magnetic flux transfer portion is gap-fitted in the cylindrical portion.