SOLENOID VALVE AND OIL PUMP

PROBLEM TO BE SOLVED: To rationally constitute a solenoid valve which can finely adjust a discharge flow rate, and has high controllability.SOLUTION: An solenoid valve V comprises: a cylindrical spool 3 having an annular groove 31 at an outer surface, and moving along an axial direction X by a drive force which is generated by current supply to a solenoid part A; a cylindrical sleeve 4 having a penetration hole 5 which can communicate with the annular groove 31, and accommodating the spool 3; and an energization member 6 for energizing the spool 3 by an energization force in a direction opposite to a direction in which the drive force is generated. When the solenoid part A is not supplied with current, a part of the penetration hole 5 communicates with the annular groove 31, then, when the solenoid part A I is supplied with current, the sleeve 3 moves by the drive force which withstands the energization force, and accordingly, a communication area between the penetration hole 5 and the annular groove 31 is enlarged.SELECTED DRAWING: Figure 1 【課題】排出流量をきめ細かく調節できる制御性の高い電磁弁を合理的に構成する。【解決手段】電磁弁Ｖは、外表面に環状溝３１を有してソレノイド部Ａへの通電により発生する駆動力によって軸方向Ｘに沿って移動する筒状のスプール３と、環状溝３１と連通可能な貫通孔部５を有してスプール３を収容する筒状のスリーブ４と、駆動力の発生方向とは反対方向の付勢力でスプール３を付勢する付勢部材６と、を備え、ソレノイド部Ａに通電しないとき、貫通孔部５の一部が環状溝３１に連通し、ソレノイド部Ａに通電したとき、付勢力に対抗する駆動力によりスプール３が移動するに従って、貫通孔部５と環状溝３１との連通面積が増大する。【選択図】図１