JP2515418Y2 - Solenoid valve - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for pressure control which is particularly required for high pressure, high responsiveness and high stroke accuracy among hydraulic control solenoid valves for ships, vehicles and the like.

[0002]

2. Description of the Related Art A hydraulic control solenoid valve of this type has a structure as shown in FIG. That is, the movable iron core 1 is attracted to the fixed iron core 3 by the excitation of the coil 2 and moves in the P direction in the figure.

When the coil 2 is in the non-excited state, the movable iron core 1 is separated from the fixed iron core 3 together with the spacer 4 by the return spring 5 and operates in the Q direction in FIG. A valve mechanism is formed by the tip spherical portion 7 of the shaft 6 which is integrated with the movable iron core 1 and the seat valve 8 having the receiving surface A.

The spherical portion 7 of the shaft 6, which operates integrally with the movable iron core 1 when the coil 2 is excited, operates in the P direction to separate from the receiving surface A of the seat valve 8 and the valve is opened. or,
When the coil 2 is not excited, the return spring 5
As a result, the spherical portion 7 operates in the Q direction, and the valve in close contact with the receiving surface A of the seat valve 8 is closed. By this operation, the oil passing from the oil passage 9 of the fixed iron core 3 to the oil passage 10 of the movable iron core 1 is opened and closed by the valve mechanism.

This solenoid is for pressure control and has a very short stroke.
An accuracy of 100 mm is required. For this reason, it is very difficult to control the strokes by stepping or stoppers, etc., while suppressing the dimensional tolerance of each component.

Here, the stroke of the movable iron core 10 is fixed by press-fitting the fixed iron core into either or both of the end cap 11 and the non-magnetic filler ring 13 while adjusting the stroke.

However, in such a method, since the fixed iron core 3 is fixed only by press fitting, the swelling of the filler ring 13 when the viscosity of the oil is high and the pipeline resistance is high, or at high temperature and high pressure ( When the holding capacity of the fixed iron core 3 due to the initial press-fitting due to internal pressure and thermal expansion is reduced, the fixed iron core 3 may move and the position may change. For example, when the fixed iron core 3 moves to the right, the stroke is reduced.

[0008]

In the present invention, the shape of the rear portion of the fixed iron core is made thin as shown in FIG. 2, and after the stroke adjustment, a conical or radial shape is obtained by a caulking jig having a shape as shown in FIG. It is possible to prevent the fixed iron core from moving in the P direction by spreading it to the end cap as shown in FIG. If necessary, the end cap may be shaped so that the fixed iron core can easily be eaten.

[0009]

[Effects of the Invention] The present invention enables highly accurate stroke control in a pressure control type solenoid valve that requires high pressure and high responsiveness, and prevents the fixed iron core from moving due to hydraulic pressure, temperature, etc. It is possible to provide a solenoid valve having a stroke.

[Brief description of drawings]

FIG. 1 Schematic view of the solenoid of the present invention

FIG. 2 is a structural diagram of a conventional solenoid and a caulking jig.

[Explanation of symbols]

 1 Movable iron core 2 Coil 3 Fixed iron core 4 Spacer 5 Return spring 6 Shaft 7 Shaft tip spherical part 8 Seat valve 9 Fixed iron core oil passage 10 Movable iron core oil passage 11 End cap 12 Bearing 13 Filler ring 14 Caulking cure Ingredient

Claims (2)

(57) [Scope of utility model registration request] 1. A fixed iron core having an oil passage in the axial direction, which is press-fitted and fixed in a magnetic body case that houses a coil, and is arranged so as to be movable in the axial direction so as to face the end surface of the fixed iron core. A non-magnetic spacer is interposed between a movable iron core having an oil passage in the axial direction, and a shaft fixed to the movable iron core has a spherical portion having a valve function at the tip of the shaft, and a magnetic force generated by the coil In a solenoid valve in which the movable iron core reciprocates due to a reaction force of a spring to open and close the valve, after determining a press-fitting fixed position of the fixed iron core that determines a moving distance of the movable iron core, the fixed iron A solenoid valve characterized in that the rear end of the core can be fixed in position by crimping, bending, etc. with respect to the end cap fixed to the case. 2. The solenoid valve according to claim 1, wherein electromagnetic soft iron is used for the fixed iron core.