Electromagnetic valve

An electromagnetic valve comprising:

• a tubular sleeve;
• a tubular valve body with an inflow hole through which a fluid flows in and an outflow hole through which the fluid flows out, the valve body being liquid-tightly fixed at one end side of the sleeve;
• a stator liquid-tightly fixed at another end side of the sleeve;
• a movable element that is arranged between the stator and the valve body inside the sleeve and that moves along an axis of the sleeve;
• an urging member that urges the movable element along the axis;
• a seat member that is fixed inside the valve body and that includes a valve seat and a valve hole communicating with the valve seat;
• a valve element that moves along the axis integrally with the movable element to be seated and separated with respect to the valve seat;
• a coil provided on an outer periphery of the sleeve;
• and
• a yoke with a first insertion hole for inserting the stator and a second insertion hole coaxial with the first insertion hole for inserting the sleeve, the yoke being provided to surround the coil and to form a magnetic circuit together with the stator and the movable element when the coil is energized,
• wherein:
• the yoke includes a notch formed by being notched to an outside of a circumference from two points on the circumference forming one of the first insertion hole or the second insertion hole, and that has a minimum distance between the two points as a width and a distance from a straight line connecting the two points in a direction orthogonal to the straight line as a length;
• in the notch, width and length are set so that a ratio L/W representing a ratio of the length with respect to the width satisfies,
• L/W≥0.12θ+0.17
• where W is the width, L is the length, and θ is a central angle formed by a center point of the one of the first insertion hole or second insertion hole and a straight line connecting each of the two points in relation to the width;
• and
• the notch is provided in the one of the first insertion hole or the second hole that is on a side proximate to the valve element accommodated inside the sleeve in a state in which the sleeve is inserted.

An electromagnetic valve comprising:

• a tubular sleeve;
• a tubular valve body through which a fluid flows in and an outflow hole through which the fluid flows out, the valve body being liquid-tightly fixed at one end side of the sleeve;
• a stator liquid-tightly fixed at another end side of the sleeve;
• a movable element that is arranged between the stator and the valve body inside the sleeve and that moves along an axis of the sleeve;
• an urging member that urges the movable element along the axis;
• a seat member that is fixed inside the valve body and that includes a valve seat and a valve hole communicating with the valve seat;
• a valve element that moves along the axis integrally with the movable element to be seated and separated with respect to the valve seat;
• a coil provided on an outer periphery of the sleeve;
• and
• a yoke with a first insertion hole for inserting the stator and a second insertion hole coaxial with the first insertion hole for inserting the sleeve, the yoke being provided to surround the coil and to form a magnetic circuit together with the stator and the movable element when the coil is energized;
• wherein:
• the yoke includes a notch formed by being notched to an outside of a circumference from two points on the circumference forming one of the first insertion hole or the second insertion hole, and that has a minimum distance between the two points as a width and a distance from a straight line connecting the two points in a direction orthogonal to the straight line as a length;
• and
• the notch is provided in the one of the first insertion hole or the second hole that is on a side proximate to the valve element accommodated inside the sleeve in a state in which the sleeve is inserted.