An electromagnetic actuator includes an electromagnetic coil, a yoke serving as a magnetic path of a magnetic flux of the electromagnetic coil, an armature configured to move in an axial direction while being attracted by the yoke by energization of the electromagnetic coil, and a housing that houses the armature. The armature and the housing are coupled to each other by an engagement structure in which protrusions provided on one of the members engage with engagement grooves formed in the other one of the members. At least a part of the engagement groove is inclined with respect to the axial direction. When the armature moves while being attracted by the yoke, the protrusions of the armature slide along the engagement grooves of the housing, and the armature turns relative to the housing along the inclination of the engagement grooves.

A solenoid includes: a coil that generates magnetic force when energized; a plunger formed in a columnar shape and configured to slide in an axial direction; a yoke provided along the axial direction and includes a tubular portion; a bottom opposed to a base end surface of the plunger; and a stator core. The stator core includes: a magnetic attraction core that magnetically attracts the plunger by magnetic force; a slide core; and a magnetic flux passage restricting portion that restricts passage of the magnetic flux between the slide core and the magnetic attraction core. The slide core includes: a core portion arranged radially outside the plunger; and a magnetic flux transmitting portion that expands radially outward from an end portion of the core portion. The yoke includes a magnetic flux passage area expansion portion that is formed on the tubular portion and protrudes radially inward from the tubular portion.

A solenoid includes a coil, a plunger, a yoke, and a stator core. The yoke includes a side wall and a bottom. The stator core includes a magnetic attraction core, a slide core, and a magnetic flux passage restricting portion. The slide core includes: a core portion formed in a tubular shape; and a first magnetic flux transmitting portion configured to transmit magnetic flux between the yoke and the plunger through the core portion. The magnetic flux passage restricting portion is configured to restrict passage of the magnetic flux between the slide core and the magnetic attraction core. A second magnetic flux transmitting portion is configured to transmit the magnetic flux between the magnetic attraction core and the side wall. An elastic member is arranged in contact with an end surface of the magnetic attraction core and is configured to bias the stator core toward the bottom.

An electromagnetic actuating device. The device includes an electromagnetic coil including a central recess extending in an axial direction, a cylindrical pole tube inserted into the central recess and provided with a magnetic separation point, an armature situated displaceably in the pole tube, the armature being movable by an actuation of the electromagnetic coil, the armature being mounted in the pole tube in a sleeve-shaped bearing foil inserted into the pole tube, the bearing foil including an inner side facing toward the armature and used as a sliding surface and an outer side facing toward the cylindrical pole tube. It is provided that the bearing foil is coated at least on the inner side using a first layer made of perfluoroalkoxy polymer. A manufacturing method for such an electromagnetic actuating device is also described.

An electromagnetic actuating device is described. The electromagnetic actuating device includes a pole sleeve, an armature disposed radially within the pole sleeve and a coil form of an electromagnetic coil disposed radially outside of the pole sleeve. The armature has a first armature end face at one end and a second armature end face at the opposite end. On or in the coil-form wall, the coil form has a longitudinal channel extending along the longitudinal direction of the coil form, by which a flow connection is created between the armature end faces.

An electromagnet and method for producing the electromagnet. The electromagnet is intended to maintain pretensioning force of fastening by a force acting on a yoke over intended operating time under changing operating temperatures. The yoke encloses an armature that is provided with a flange, which conducts magnetic flux from a housing to the armature, the housing being connected on the one hand to a flange of the yoke and on the other hand to a core flange in a material-bonding manner by welding. The electromagnet can be used for actuation of valves, couplings or other electromechanical adjusting elements.

Presented are a single coil apparatus and a method of forming. An exemplary apparatus includes solenoid assembly. The solenoid assembly includes a core tube extending along a longitudinal axis. The solenoid assembly further includes a first magnet and a second magnet located outside the core tube, the first magnet spaced along the longitudinal axis from the second magnet, and an excitation coil disposed radially outward of the first magnet and the second magnet.

The present disclosure provides systems and methods for an electromagnetic actuator having a unitary pole piece arranged within and coupled to a housing. The electromagnetic actuator can include the housing, the unitary pole piece, an armature received within the unitary pole piece, and an end cap. The unitary pole piece is structured to provide a reduction in air gaps within the electromagnetic actuator.

A valve portion has a sleeve and a valve body inserted into the sleeve. A solenoid portion includes a stator core having a magnetic attraction core, a sliding core, a magnetic flux passage suppressing portion, a yoke having a bottom portion, a side surface portion, and a thin wall portion, a coil portion, a plunger, and a magnetic tubular base portion. The base portion has a first tubular portion in which a first outer peripheral surface of the sleeve is press-fitted into inside and fastened to the first outer peripheral surface, a flange portion that has an outer diameter larger than the outer diameter of the first tubular portion, is arranged on an outer side in a radial direction of a second outer peripheral surface of the magnetic attraction core, and is caulked and fixed to the thin wall portion while being in contact with the yoke inside the yoke.

The disclosure relates to an electromagnetic actuating device for a hydraulic camshaft adjuster. The electronic actuating device includes a housing, a yoke, a pole core, an armature, and an actuating pin and a bearing unit. The actuating pin is led out of the housing by means of the bearing unit, and the bearing unit forms a press-fit connection with the housing or with a component connected to the housing. To improve the connection, the bearing unit, the housing and/or the component connected to the housing have a recess that increases the elasticity of the press-fit connection.