Solenoid, solenoid valve, shock absorber, and method for manufacturing a solenoid
A solenoid includes a coil bobbin, a coil, a terminal, a housing, an armature, an actuation pin, and the like. The coil bobbin includes a tubular portion, and a first flange portion formed on one end of the tubular portion and extending radially to outside the tubular portion. The coil is wound around the coil bobbin. The terminal connects a terminal conductor portion of the coil and a cable. The terminal includes a joint portion that joins the terminal conductor portion of the coil. The joint portion extends in a direction along one end surface of the first flange portion.
1 . A solenoid comprising:
a bobbin including a tubular portion, and a large-diameter portion formed on one end of the tubular portion and extending radially to outside the tubular portion;
a coil wound around the bobbin;
a terminal configured as a member that connects a terminal conductor portion of the coil and an external electric wire and including a joint portion that joins the terminal conductor portion of the coil, the joint portion extending in a direction along one end surface of the large-diameter portion of the bobbin;
a magnetic core fixed to an inner periphery of the coil; and
a magnetic plunger provided movably closer to the core,
wherein the terminal includes a winding portion around which the terminal conductor portion of the coil is wound, and the winding portion and an arm portion extending from the winding portion extend together with the joint portion in a direction in which the joint portion is disposed along the one end surface of the large-diameter portion of the bobbin,
wherein the terminal further includes a curved portion curved toward a radially inner side of the bobbin so as to cause the winding portion of the terminal to be located inside the large-diameter portion of the bobbin,
wherein the curved portion is curved by being supported by a support portion provided on the bobbin,
wherein the terminal further includes an extension portion, and the extension portion includes a first extension portion extending outward in the radial direction of the bobbin and a second extension portion extending in a central axial direction of the bobbin from a distal end of the first extension portion, thereby forming the extension portion in the shape of the letter L, and
wherein the second extension portion holds the external wire.
2 . The solenoid according to claim 1 , wherein the joint portion joining the terminal and the terminal conductor portion of the coil includes a caulked portion subjected to caulking processing, and
wherein the caulked portion is subjected to the caulking processing so as to be folded back in an axial direction of the tubular portion of the bobbin and sandwich the terminal conductor portion of the coil therein.
3 . The solenoid according to claim 2 , wherein the winding portion of the terminal is disposed so as to be located inside the large-diameter portion of the bobbin.
4 . The solenoid according to claim 1 , wherein a cutout portion is formed on the large-diameter portion of the bobbin, the cutout portion being cut out in an axial direction and a radial direction of the tubular portion, and
wherein the winding portion is disposed in the cutout portion.
5 . The solenoid according to claim 4 , wherein the cutout portion is subjected to molding processing using resin.
6 . The solenoid according to claim 1 , wherein a protrusion portion is formed on the one end surface of the large-diameter portion of the bobbin, the protrusion portion protruding so as to abut against the terminal and fix the terminal.
7 . The solenoid according to claim 1 , wherein a recessed portion is formed on the tubular portion of the bobbin, the recessed portion being configured to allow the terminal to be deformed in an inner-diameter direction with respect to an outer diameter of the tubular portion.
8 . A solenoid valve comprising:
the solenoid according to claim 1 ; and
a valve member on an inner periphery of the coil, the valve member being configured to be driven by the solenoid.
9 . A shock absorber including the solenoid valve according to claim 8 , the shock absorber comprising:
a cylinder sealingly containing hydraulic fluid therein;
a piston inserted in the cylinder and dividing an inside of the cylinder into a one-side chamber and an opposite-side chamber;
a piston rod coupled with the piston and extending out of the cylinder;
a flow path in which a flow of the hydraulic fluid is generated due to a movement of the piston rod; and
the solenoid valve in which an opening area of the flow passage is adjusted by the solenoid.
10 . A method for manufacturing a solenoid according to claim 1 ,
wherein the terminal includes a caulked portion subjected to caulking processing so as to sandwich the terminal conductor portion therein, the caulked portion being configured to be folded back in an axial direction of the tubular portion of the bobbin,
the method for manufacturing the solenoid comprising:
a winding step of forming a wound portion by winding the terminal conductor portion of the coil around the winding portion of the terminal;
a caulking step of applying the caulking processing to the terminal and the terminal conductor portion of the coil from the axial direction; and
a bending step of bending the terminal along the support portion of the bobbin so as to deform the wound portion of the coil to an inner-diameter side with respect to an outer diameter of the large-diameter portion.
11 . The method for manufacturing the solenoid according to claim 10 , wherein the solenoid includes a cutout portion provided on the large-diameter portion of the bobbin and cut out in the axial direction and a radial direction of the tubular portion, and
wherein the bending step includes a storage step of storing the wound portion into the cutout portion formed on the large-diameter portion.
12 . The method for manufacturing the solenoid according to claim 11 , further comprising a molding step of pouring resin from the cutout portion and molding it.