| 摘要 |
An electromagnet includes a cylindrically shaped electric coil made of magnetic material and wound around a bobbin made of resin material and made of magnetic material, a cylindrically shaped case made of magnetic material and housing the electric coil, a yoke made of magnetic material for forming a magnetic circuit in cooperation with the case, with both longitudinal ends of the yoke facing the bobbin, and a plunger made of magnetic material and disposed in the inner peripheral of the yoke for moving by electromagnetic force in the longitudinal direction when current is supplied to the electric coil. The bobbin and the yoke are integrated with each other by resin forming, with the outer peripheral portion of the yoke facing the inner peripheral portion of the bobbin being subjected to grooved treatment in the longitudinal direction to form at least one groove and/or knurling treatment to form a knurled outer peripheral portion of the yoke. The electromagnet includes a spool valve positioned at one end of the case.
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