A central actuator for a magnet valve of a cam phaser, the central actuator including a housing that envelops the central actuator; a pole tube and a pole core that are arranged within at least one coil that generates a magnetic field; an actuation plunger that is arranged at an armature that is axially movable in a direction in an armature cavity; a closure element that closes the armature cavity, wherein the closure element includes at least one pole core insert that includes a central bore hole and a support bushing that is arranged in the central bore hole of the pole core insert, wherein the actuation plunger is supported axially movable in the support bushing, and wherein the closure element includes a closure cover and is provided as a pre-assembled module.

An electromagnetic actuator having a permanent magnet coupled to an armature of the electromagnetic actuator is provided. The electromagnetic actuator includes a housing, a pole piece arranged within the housing and secured by an end plate, and an armature assembly having an armature and a permanent magnet coupled to the armature. The armature is movable between a first position and a second position. The electromagnetic actuator further includes a wire coil positioned around the armature assembly and arranged within the housing. An actuation position of the armature between the first position and the second position is proportional to a magnitude of current applied to the wire coil.

A solenoid drive may include a ferromagnetic housing having a coil receiving chamber axially limited by opposing first and second face side walls, and a cylindrical coil arrangement having at least one electric coil, and being arranged in the coil receiving chamber and coaxially surrounding a cylindrical coil interior space. The solenoid drive may also include a ferromagnetic plunger stop having a central region projecting axially in the coil interior space, and a ferromagnetic plunger arranged at the housing opposing the plunger stop. The plunger may project axially into the coil interior space, and may be adjustable axially bi-directionally between an active position proximal to the central region and a passive position distal to the central region. The solenoid drive may further include a ferromagnetic bypass device arranged coaxially to the coil arrangement, radially within the at least one coil, and spaced apart axially from the face side walls.

A linear actuator comprising a support structure; at least one magnet provided on the support structure; a carriage; at least one coil arrangement provided around the carriage; and a spring arrangement operatively connected between the support structure and the carriage to urge the carriage towards a predetermined position relative to the support structure; wherein a part of one of the support structure and the carriage is received by a part of the other of the support structure and carriage so as to constrain motion of the carriage relative to the support structure substantially along a longitudinal axis of the linear actuator.

Disclosed is a solenoid configured so that vibration and noise in energization can be reduced. The solenoid is configured to use magnetic action in energization of a coil to drive, in an axial direction, a core at least including a first magnetic resistor. The solenoid includes a shaft attached to the core, and bearings supporting both end portions of the core. The solenoid further includes a second magnetic resistor configured to generate force for moving at least the core in a radial direction by the magnetic action.

A shaft outputs a thrust force in an axial direction by using a magnetic flux caused by an electric current flowing through a coil. A housing is made of resin and retains the shaft. The housing has a base portion having an outer circumferential surface, which is configured to be entirely in contact tightly with a sealing member. The housing further has a distal portion having an outer circumferential surface defining a depression. The outer circumferential surfaces of the base portion and the distal portion are substantially equal in diameter and are formed continuously.

A solenoid actuator is provided having an armature assembly with a separate joined shunt side bearing consisting of a non-magnetic or slightly magnetic material. The material of the shunt side bearing prevents significant amounts of magnetic flux transferring through the lower bearing area of the armature assembly in the radial direction.

An electromagnetic positioning device (1), having a stationary spool unit (9), having a moveably guided anchor (2), which forms a positioning section (14) and which can be axially displaced along a displacement axis (V) in response to supplying the spool unit (9) with current, as well as having a one-part cup-shaped yoke-core element (3), which receives the anchor (2) and which includes a core section (5) as well as a yoke section (6) and which has a yoke-core bottom (4) extending perpendicular to the displacement axis (V) and a yoke-core sheath extending perpendicular to the yoke-core bottom (4) along the displacement axis (V), a longitudinally cut transition area (8) reduced in thickness and arranged between the core section (5) and the yoke section (6) being realized in the yoke-core sheath. It is intended that a guide pin (17) for the anchor (2) is fixed, preferably pressed in, in a, preferably centric, guide pin recess (18) in the yoke-core bottom (4) and protrudes axially into a, preferably centric, guide opening (13) of the anchor (2) and can be displaced relative to the anchor (2) during its displacement movement.

A rolling-element bearing for an electromagnetic solenoid includes a hollow cylindrical cage with a plurality of spherical pockets formed around a first circumference and a second circumference of the cage. The pockets around the first circumference are offset from the pockets around the second circumference. Spherical rolling elements are provided in the spherical pockets and are captured for free rotation in the first pockets and second pockets.

An electromagnetic drive for implementing a linear motion includes an electromagnet having a coil, a core and an armature able to move linearly along a symmetrical axis of the core, wherein an air gap is formed between the core and the armature. With the objective of providing for simple, compact, cost-effective and flexible use of the electromagnetic drive in high-pressure systems as well as a concurrent exact positioning of the piston at any given position at optimized extension speed, it is provided for the air gap to exhibit a base and two limbs running symmetrically to the symmetrical axis as well as an essentially frustoconical cross-section in longitudinal section and for the limbs to be arranged relative to the symmetrical axis of the core so as to form an angle .