A solenoid valve and a manufacturing method are disclosed. The solenoid valve includes a main body portion, a movable iron core, a valve portion, a lower cover and an upper cover. Wherein the main body portion includes a bobbin, a fixed iron core, a magnetic conductive portion, a coil and an outer case. The outer case covers the bobbin, the fixed iron core, the magnetic conductive portion, and the coil. The movable iron core is movable relative to the fixed iron core, and the lower cover is disposed in the valve portion. A left side surface of the upper cover is fixed at the valve portion and the lower cover, and a right side surface of the upper covers is fixed at the main body portion. The solenoid valve has stable size and stable operation, and can quickly cut off the air pressure, and the control effect is good.

There is provided a method of assembling a torque motor. The method comprises fastening the torque motor to a support such that any magnetic elements of the torque motor are substantially fixed in position with respect to the support, but without securing an armature to the torque motor, locating the armature of the torque motor around a fixed element of the torque motor such that the armature is able to move with respect to the fixed element, moving the armature with respect to the fixed element whilst the magnetic elements of the torque motor are substantially fixed in position with respect to the support, so as to position the armature in an in use orientation or position, and then attaching the armature to the fixed element in the in use orientation or position.

A method for producing a magnetic core for an electromagnetic actuator of an electromagnetic valve train includes punching a core blank from a soft magnetic metal sheet and reshaping the core blank. The core blank has a base segment with an opening and a plurality of wall segments that extend outwardly from an outer edge of the base segment. The plurality of wall segments is bent in a direction substantially perpendicular to the base segment during the reshaping.

A method for producing a magnetic core for an electromagnetic actuator of an electromagnetic valve train includes punching a core blank from a soft magnetic metal sheet and reshaping the core blank. The core blank has a base segment with an opening and a plurality of wall segments that extend outwardly from an outer edge of the base segment. The plurality of wall segments is bent in a direction substantially perpendicular to the base segment during the reshaping.

A method for manufacturing a solenoid-armature ram composite and a corresponding solenoid-armature ram composite for a linear actuator which has a stator with a coil that can be fed with electrical current for producing an electromagnetic field and a single-part or multi-part solenoid armature movable along a longitudinal axis of the coil and a ram connected with the solenoid armature, provides that the solenoid armature surrounds the ram in a ring shape and a gap between the ram and the solenoid armature is cast with a casting material.

A method for manufacturing a solenoid-armature ram composite and a corresponding solenoid-armature ram composite for a linear actuator which has a stator with a coil that can be fed with electrical current for producing an electromagnetic field and a single-part or multi-part solenoid armature movable along a longitudinal axis of the coil and a ram connected with the solenoid armature, provides that the solenoid armature surrounds the ram in a ring shape and a gap between the ram and the solenoid armature is cast with a casting material.

An actuator (1) is provided A substrate (15) held by a support (2) is provided with a total of six power supply electrodes (153) electrically connected respectively to both ends of a first coil (61) of a first magnetic drive circuit (6) that vibrates a movable body (3) in an X direction, both ends of a second coil (71) of a second magnetic drive circuit (7) that vibrates the movable body (3) in a Y direction, and both ends of a third coil (81) of a third magnetic drive circuit (8) that vibrates the movable body (3) in the X direction. An opening (110) that exposes the six power supply electrodes (153) is formed in a cover (11).

A torque motor for use in a servovalve wherein only two holes must be provided through each of the pole pieces in order to assemble the torque motor together. The torque motor comprises first and second opposing pole pieces, first and second permanent magnets positioned between the first and second pole pieces; an armature comprising a magnetic plate and a flapper, the magnetic plate being positioned between the first and second permanent magnets, the flapper being connected at one end to the magnetic plate; and further comprising: first and second fastening means each extending through the first pole piece, the armature and the second pole piece to thereby fasten the torque motor together.

A torque motor for use in a servovalve wherein only two holes must be provided through each of the pole pieces in order to assemble the torque motor together. The torque motor comprises first and second opposing pole pieces, first and second permanent magnets positioned between the first and second pole pieces; an armature comprising a magnetic plate and a flapper, the magnetic plate being positioned between the first and second permanent magnets, the flapper being connected at one end to the magnetic plate; and further comprising: first and second fastening means each extending through the first pole piece, the armature and the second pole piece to thereby fasten the torque motor together.

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.