JPH08288127A - Solenoid - Google Patents

Abstract

PURPOSE: To eliminate a spring component and reduce the cost for components and assembly by a method wherein a molded coil itself has a shape which absorbs backlash. CONSTITUTION: An electromagnetic solenoid is composed of a core tube 1 which has a screw part 1a screwed into a solenoid valve body, a case 2, yokes 3a and 3b of which a magnetic path is composed, a molded coil and a washer and a nut 5 with which the case 2 is fixed to the core tube 1. A plurality of protrusions 4a are provided on the molded coil 4. A plurality of the protrusions 4a are compressed and deformed by tightening the nut 5 and the molded coil 4 itself is pressed against the yoke 3a. Therefore, backlash can be avoided and heat can be dissipated satisfactorily.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to solenoids for solenoid valves.

[0002]

2. Description of the Related Art In the conventional solenoid of a solenoid valve shown in FIG. 3, when a molded coil 11 is housed in a case 10, the difference between the axial dimension Lc of the case and the axial dimension Lm of the molded coil is reduced. If it is stored as it is, it will play, and in a mechanical device with a lot of vibration, it will be a source of noise, and the heat dissipation from the mold coil will be poor, causing burnout. Metal spring washer 1
2 was used.

[0003]

In order to improve the heat dissipation from the molded coil, the metal spring type washer 12 or the like for constantly moving the coil 11 to one of the case and the yoke is not required, and the cost of parts relating to parts is reduced. , Reduce management costs and assembly costs.

[0004]

A solenoid valve solenoid in which a magnetic path is formed by a yoke and a case, a core tube is penetrated through the yoke and the case, and a mold coil is provided in the case, a molded coil is provided. Is provided with a plurality of small area protrusions that can be deformed by compression on one end surface, and the molded coil is housed by pressing the protrusions with the yoke or the case.

[0005]

[Operation] The length of the small area protrusion of the mold coil is
Since it is formed more than the difference between the axial dimension of the case and the axial dimension of the molded coil, a reaction force is generated when the protrusion is compressed and deformed when stored in the case, and there is no protrusion. The surface of is always in contact with the inner surface of the case or the yoke. Therefore, backlash is prevented from occurring and heat is radiated well.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an embodiment of the present invention, in which a solenoid of a solenoid valve has a screw portion 1a screwed into a solenoid valve body (not shown).
A core tube 1 and a case 2, a magnetic path forming yokes 3a and 3b, a mold coil 4, a washer 6 for fixing the case 2 to the core tube 1, and a nut 5. A movable iron core is slidably housed in the core tube 1, and the valve body of the solenoid valve is moved by exciting the coil. As shown in FIG. 2, the mold coil 4 is provided with a plurality of protrusions 4a. The plurality of protrusions 4a have a length equal to or greater than the difference between the lengths Lc and Lm in FIG. The value will be taken into consideration. The protrusion 4a is compressed and deformed by tightening the nut 5, and presses the molded coil 4 itself against the yoke 3a. Therefore, backlash is prevented from occurring and heat is radiated well.

[0007]

EFFECTS OF THE INVENTION By providing a small area protrusion on the molded coil itself, backlash can be prevented, heat can be dissipated well, and the washer 12 etc. can be dispensed with. Costs related to assembly can be reduced.

[0008]

[Brief description of drawings]

FIG. 1 shows a solenoid that is an embodiment of the present application.

FIG. 2 shows an external view of the molded coil of FIG.

FIG. 3 shows a conventional example of an electromagnetic solenoid.

[Explanation of symbols]

 1: Core tube 2: Case 3a, 3b: Yoke 4: Mold coil 4a: Protrusion 5: Washer, nut 10: Case 11: Mold coil 12: Washer

Claims (1)

[Claims] 1. A yoke and a case forming a magnetic path,
In a solenoid comprising a core tube penetrating the yoke and the case and a molded coil provided in the case, the molded coil has a plurality of small area elastically deformable projections on one end surface thereof. A solenoid provided, wherein the protrusion is pressed against the yoke or case to accommodate the molded coil.