Electromagnetic valve

Abstract

An electromagnetic valve (100) is provided with a housing (10), a valve body (21), a movable core (22), a spring (23), a coil (24), and a stationary core (11c). The housing (10) comprises a cylinder section (11b) that houses the movable core (22) so as to be movable in the axial direction. An axial-direction intermediate section of the cylinder section (11b) is composed of a nonmagnetic section (11b1) that surrounds the outer circumference section of the axial-direction intermediate section of the cylinder section (11b), and the two sides of this nonmagnetic section (11b1) in the axial direction are composed of a one-side magnetic section (11b2) and an other-side magnetic section (11b3) that surround the outer circumference of the movable core (22). The electromagnetic valve (100) is configured such that by energizing the coil (24), an electromagnetic force is generated in a direction orthogonal to the axial direction so as to cause frictional resistance to axial movement of the movable core (22), said electromagnetic force being generated in the space between the outer circumference of the movable core (22) and the one-side magnetic section (11b2) of the cylinder section (11b) at one side of the nonmagnetic section (11b1) in the axial direction, and in the space between the outer circumference of the movable core (22) and the other-side magnetic section (11b3) of the cylinder section (11b) at the other side of the nonmagnetic section (11b1) in the axial direction.

Description

technical field [0001] The present invention relates to a solenoid valve, for example, a solenoid valve for hydraulic control of brake fluid (fluid) incorporated in a hydraulic control device of a hydraulic brake device for a vehicle. Background technique [0002] As one of such solenoid valves, for example, the following patent document 1 discloses a solenoid valve that includes a housing provided with an inlet and an outlet of a fluid and a passage communicating with the inlet and outlet. , a valve hole having a valve seat at one end is provided in the passage, the housing has a cylindrical portion coaxial with the valve hole; Seat; movable iron core (also called plunger type iron core), which is assembled to the above-mentioned cylindrical part in a manner that can move integrally with the valve core in the axial direction; spring, which acts on the above-mentioned valve core and the above-mentioned movable core. The iron core exerts a force in the direction of seating o...

AI Technical Summary

Problems solved by technology

However, in the solenoid valve described in the above-mentioned Patent Document 1, the attracting portion (one end portion) of the movable core (the plunger core) is surrounded from the outer periphery by the non-magnetic portion provided on the cylindrical portion of the case, so that the non-magnetic One side of the axial direction (fixed core side), and the direction perpendicular to the axis (diameter direction), the electromagnetic force perpendicular to the axis (radial direction) generates frictional resistance relative to the axial movement of the movable core (plunger core)

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