A solenoid (54) for a solenoid-actuated valve (30) includes a sintered powder metal one-piece core (64) of at least one soft magnetic material and at least one non-magnetic material integrally connected together and a movable armature (88) disposed in the core(64) and having a tapered tip to achieve a required force vs position and current characteristics.

A linear actuator configured to axially move a plunger. The linear actuator includes a flux sleeve surrounded by a bobbin housing a wire coil. The flux sleeve defines an armature cavity extending along a movement axis, where a magnetic field is created within the flux sleeve when a current is applied to the wire coil. An armature is receivable within the armature cavity, where the magnetic field created within the flux sleeve acts upon the armature such that the armature moves along the movement axis based on the magnetic field, and where moving the armature moves the plunger. A liner is positioned within the armature cavity between the armature and the flux sleeve. The liner includes at least one of a polyamide and a polyimide.

An electromagnetic actuator includes an armature which has a stop face, and a pole piece which has a counter stop face, wherein the stop face and the counter stop face in terms of geometry are configured so as to be mutually complementary such that the stop face and the counter stop face in a movement of the armature toward the pole piece engage in one another, displacing a medium which is disposed between the stop face and the counter stop face. An electromagnetic valve may include the electromagnetic actuator, and a high-pressure fuel pump may include the electromagnetic valve.

A starter for an internal combustion engine may include a support, an electric motor for driving a pinion in rotation, and a solenoid drive configured to axial adjust the pinion between an active position and a passive position. The solenoid drive may include a ferromagnetic plunger stop, a plunger axially adjustable, and a cylindrical coil arrangement surrounding a cylindrical coil interior. The plunger stop may include a cylindrical section projecting into the coil interior. The plunger may be arranged axially opposite the cylindrical section and, when the pinion is in the active position, protruding axially into the coil interior. When the pinion is in the passive position, a face-side plunger end may be arranged axially in a proximal end portion. The cylindrical section may extend into the coil interior such that a face end is closer to the proximal end portion than to a distal end portion.

A flow rate control valve includes a bobbin and a plunger. On an inner circumferential surface of the bobbin, multiple protruding regions that extend in a direction parallel in an axial direction to the plunger, and a plurality of recessed grooves that form flow paths for a fluid when valve is open are provided side by side alternatingly in a circumferential direction. The multiple recessed grooves include a first recessed groove, second recessed groove, and third recessed groove that are arranged side by side sequentially in the circumferential direction. An interval in the circumferential direction between the first recessed groove and second recessed groove and an interval in the circumferential direction between the second recessed groove and third recessed groove are the same. Surfaces of the multiple protruding regions formed on the inner circumferential surface of the bobbin can be arranged at positions closer to those of one perfect circle.

A bistable solenoid valve for a hydraulic braking system includes a magnetic assembly, a guide sleeve, a stationary component fixedly arranged in the guide sleeve, and a valve armature axially movably arranged in the guide sleeve. The valve armature includes a permanent magnet that is polarized in the direction of motion thereof. The magnetic assembly is slid onto the stationary component and the guide sleeve, and the stationary component forms an axial stop for the valve armature. The valve armature is configured to be driven by a magnetic force from the magnetic assembly or from the permanent magnet so as to force a closing element into a valve seat during a closing motion and lift the closing element out of the valve seat during an opening motion. The valve armature has a magnet receptacle that holds the permanent magnet. A hydraulic braking system includes the bistable solenoid valve.

An electromagnetic actuator includes a fixed body, a moving part forming a magnetic core of the actuator and being movable in translation with respect to the fixed body between a retracted position and a deployed position, a magnetic piece forming a permanent magnet adjusted to generate a first magnetic force holding the moving part in the retracted position, and a coil adjusted to engender a second magnetic force opposed to the first magnetic force when the coil is supplied with an electrical excitation current. The moving part includes one or more notches formed in a body of the moving part.

An electromechanical solenoid includes a wall defining an internal cavity, and an armature that is situated within the internal cavity and extends along a longitudinal axis. A winding is disposed radially outward of the wall and at least partially surrounds the armature. The winding is configured to provide an electromagnetic field when the winding is energized that moves the armature along the longitudinal axis within the cavity. A cross section of the armature perpendicular to the longitudinal axis has a shape that restricts rotation of the armature about the longitudinal axis within the cavity.

In some examples, a static part includes a static body and a first cylindrical extension extending from the static body, the first cylindrical extension including an open end with a cylindrical inner surface having a first diameter. A moveable part is moveable toward the static part by the magnetic flux of a solenoid. The moveable part may include a moveable body and a second cylindrical extension extending from the moveable body, the second cylindrical extension including a cylindrical outer surface having a second diameter, smaller than the first diameter, to enable the cylindrical outer surface to move within the open end. The second diameter is sized for the cylindrical outer surface to pass adjacent to the cylindrical inner surface to enable passage of a portion of the magnetic flux radially to reduce an energy of impact between the moveable part and the static part.

[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.