An electromagnetic actuator including a coil; a non-movable part constituted by a magnetic substance and disposed on one side relative to the coil; and a movable part including a permanent magnet on the other side relative to the coil. Applying a current to the coil alternately generates first and third driving forces to move the magnet and the movable part to one and the other sides in a first direction relative to the coil and the non-movable part. As the movable part moves from a neutral position to the one side in the first direction, a portion of the magnet positioned on the one side in the first direction relative to the first end of the first non-movable part gradually enlarges and is magnetically attracted toward the non-movable part. As the movable part moves from the neutral position to the other side in the first direction, a portion of the magnet positioned on the other side in the first direction relative to the second end of the first non-movable part gradually enlarges and is magnetically attracted toward the non-movable part.

A portable electronic device and a movable lens-shutting module thereof are provided. The movable lens-shutting module includes a magnetic field generator, a rotatable driving assembly and a movable shutter assembly. The rotatable driving assembly includes a rotatable magnetic element and a rotatable driving element fixed on the rotatable magnetic element. The rotatable driving element includes at least one driving rod. The movable shutter assembly includes at least one shutter element. The shutter element includes a lens opening corresponding to a lens and a receiving groove for receiving the driving rod. When the rotatable magnetic element and the rotatable driving element are concurrently moved by a magnetic force generated by the magnetic field generator, the shutter element is moved in a linear direction by moving the driving rod, so that the lens is exposed by the lens opening or is blocked by the shutter element.

In the actuator, the first end plate part of the first cover member in the support body is layered on one side in the first direction of the holder and faces the first yoke of the movable body from one side in the first direction. The second end plate part of the second cover member in the support body is layered on the other side in the first direction of the holder and faces the movable body from the other side in the first direction. Thus, the first viscoelastic member interposed between the movable body and the first end plate part in the first direction properly contacts with the movable body and the first end plate part. The second viscoelastic member interposed between the movable body and the second end plate part in the first direction properly contacts with the movable body and the second end plate part.

A solenoid includes a coil, a cylindrical sliding core, a columnar plunger, a bottomed cylindrical yoke including a cylindrical portion and a bottom portion that is connected to the cylindrical portion and faces a base end surface of the plunger, and the bottomed cylindrical yoke configured to accommodate the coil, the sliding core, and the plunger, a magnetic attraction core arranged to face a distal end surface of the plunger, and a magnetic flux transfer member that transfers magnetic flux between the sliding core and the yoke. When the plunger is closest to the magnetic attraction core, a position of the base end surface of the plunger along an axial direction is the same as position of the end of the sliding core along the axial direction, or is closer to the bottom portion side of the sliding core along the axial direction than the end of the sliding core.

A mover is attracted and is moved in an axial direction with a predetermined stroke by a magnetic force generated between a stator and the mover when a coil is energized. The stator includes: a first stator positioned at a side where a stroke start position of the mover is located, and a second stator positioned at another side where a stroke end position of the mover is located. The mover includes a tapered portion which has a diameter progressively reduced toward the second stator, and a small-diameter cylindrical portion which is shaped in a straight form and has a constant outer diameter along an entire axial extent of the small-diameter cylindrical portion. An outer wall of the small diameter cylindrical portion has the outer diameter that is equal to an outer diameter of a smallest-diameter part of the tapered portion.

An electromagnetic actuator includes: a stator; and a movable element attracted from a stroke start position to a stroke end position in a predetermined stroke in an axial direction by magnetic force generated between the stator and the movable element when a coil is energized. The stator includes a first stator located adjacent to the movable element at the stroke start position and a second stator located closer to the movable element at the stroke end position than at the stroke start position. The movable element includes a tapered portion so as to reduce a gap between the first stator and the movable element as the movable element is moved toward the stroke end position. The first stator includes a curved surface that has a convex shape so as to expand a gap between an opening end of the first stator facing the second stator and the movable element.

An electromagnetic actuator includes a stator and a movable element. The movable element is attracted from a stroke start position to a stroke end position in a predetermined stroke in an axial direction by magnetic force generated between the stator and the movable element when a coil is energized. The stator includes a first stator located adjacent to the movable element at the stroke start position and a second stator located closer to the movable element at the stroke end position than at the stroke start position. The movable element includes a tapered portion that has a diameter becoming smaller toward the second stator and a protrusion that protrudes from an end surface of the movable element close to the second stator.

The present disclosure relates to a low friction bearing liner for a solenoid that may include a core layer, a first outer layer overlying a first surface of the core layer, a second outer layer overlying the first outer layer, a first inner layer overlying a second surface of the core layer that is opposite of the first surface of the core layer, and a second inner layer overlying the first inner layer. The first outer layer and the first inner layer may include a fluoropolymer material and may have a melt flow rate of at least about 2 g/10 min at 372° C. The second outer layer and the second inner layer may include a fluoropolymer material distinct from the fluoropolymer material of the first outer layer and may have a surface coefficient of friction of not greater than about 0.2.

An actuator for an assembly in a motor vehicle may have a moving armature in an armature chamber, where the actuator has a fluid path that is configured for fluid transfer between the armature chamber and a fluid reservoir in the assembly when the actuator is installed in an assembly, where the actuator is configured to fill the armature chamber with fluid, in particular oil, when the armature moves axially, thereby drawing fluid into the armature chamber when the actuator is operated in a fluid chamber, in particular an oil chamber.

An electromagnetic actuator (1) for an assembly, which has a fluid space configured to be fluidically connected to the actuator when the actuator is installed in the assembly, includes a movable armature in an armature space (6). The armature includes a movable armature rod (8). The actuator is configured to fill the armature space (6) with fluid, such as oil, via axial movements of the armature rod that draw fluid from the fluid space into the armature space (6) through a fluid path when the armature rod is fluidically connected to the fluid space.