JPH08316030A - Solenoid - Google Patents

Abstract

PURPOSE: To provide a solenoid having a movable core including excellent rustproofness and excellent slidability and durability. CONSTITUTION: A solenoid comprises a plated layer 2 formed on the sliding surface (front surface) of a movable core 1 moving in a piston motion by electromagnetic action and a wear resistant sliding coating layer 3 formed by spraying on the surface of the layer 2. The layer 2 is a zinc-plated layer, and the layer 3 is a molybdenum disulfide layer (or a fluorine resin layer). The satisfactory surface of the layer 2 by zinc is obtained by suitably chromating it. The layer 2 of the zinc may be 5 to 8μm thick at the lowest limit by considering the using environment, and the layer 3 of the molybdenum disulfide layer may be 10 to 15μm thick at the lowest limit by considering the using environment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable iron core type solenoid.

[0002]

2. Description of the Related Art Conventionally, a movable iron core of a solenoid has been plated mainly for the purpose of rust prevention. Further, when slidability and durability are particularly required, a sliding coating of molybdenum disulfide or fluororesin is applied to the sliding surface of the movable core instead of plating.

[0003]

However, it should be noted that there is a problem to be solved that plating is inferior in slidability and sliding coating is inferior in rust prevention. In view of such problems to be solved, it is an object of the present invention to provide a solenoid having a movable iron core that is excellent in rust prevention, and is excellent in slidability and durability.

[0004]

SUMMARY OF THE INVENTION In summary, the present invention is a solenoid in which a sliding layer of a movable iron core is formed with a plating layer, and a sliding coating layer of abrasion resistance by spraying is formed on the surface.

[0005]

According to the present invention, the sliding surface of the movable iron core is excellent in rust prevention due to the plated layer, and the abrasion-resistant sliding coating layer formed by spraying is formed on the surface, so that the sliding property and durability are also improved. Excellent and can maintain performance even under severe usage environment.

[0006]

EXAMPLES Next, examples of the present invention will be described, but they are merely specific examples adopted based on the present invention, and the present invention is limitedly interpreted based on matters peculiar to the examples only. However, the technical scope of the present invention should be determined on the basis of the matters shown in the claims or the matters substantially equivalent to the matters.

In the illustrated embodiment, a solenoid is formed by forming a plating layer 2 on a sliding surface (surface) of a movable iron core 1 which is piston-moved by electromagnetic action, and further forming a wear-resistant sliding coating layer 3 by spraying on the surface. Is. The plating layer 2 is a zinc plating layer, and the sliding coating layer 3 is a molybdenum disulfide layer (or a fluororesin layer or the like). The surface of the plated layer 2 made of zinc may be appropriately chromated. The plating layer 2 made of zinc should have a minimum thickness of about 5 to 8 μm in consideration of the use environment, and the sliding coating layer 3 made of a molybdenum disulfide layer should have a minimum thickness of about 10 to 15 μm in consideration of the use environment. It only needs to have a layer thickness.

The movable core 1 slides in a cylindrical holding guide 6 made of brass, stainless steel or the like provided in a hole of a resin bobbin 5 around which a coil 4 is energized / de-energized.
When the holding guide 6 is not provided, the hole of the bobbin 5 serves as a holding guide for the movable iron core 1. A fixed iron core 7 is provided outside the bobbin 5, the holding guide 6 and the movable iron core 1 are passed through one end surface of the fixed iron core 7, and the movable iron core 1 is provided on the other end surface of the fixed iron core 7.
A relatively short fixed iron core 8 that faces is fixed in a state of being inserted into the holding guide 6.

According to this embodiment, the sliding surface of the movable iron core 1 is excellent in rust prevention due to the plating layer 2 and further the abrasion-resistant sliding coating layer 3 is formed on the surface thereof, so that the sliding property is improved. It has excellent durability and can maintain its performance even in severe operating environments. In order to provide the sliding coating layer 3 on the surface of the plating layer 2 by a so-called tumbler method, it is necessary to oxidize the surface of the plating layer 2 in advance in order to improve the adhesion of the sliding coating layer 3. Since it is uncomfortable to oxidize the plated layer 2, it is optimal to provide the sliding coating layer 3 by spraying as in this embodiment.

[0010]

As described above, according to the present invention, it is possible to provide a solenoid having a movable iron core which is excellent in rust prevention, and is excellent in slidability and durability.

[Brief description of drawings]

FIG. 1A is a sectional view showing an embodiment of the present invention. FIG. 1B is a partial sectional view of the movable iron core.

[Explanation of symbols]

 1 Movable iron core 2 Plating layer 3 Sliding coating layer

Claims (3)

[Claims] 1. A solenoid having a plated layer on the sliding surface of a movable iron core and a wear-resistant sliding coating layer formed by spraying on the surface. 2. The solenoid according to claim 1, wherein the plating layer is a zinc plating layer and the sliding coating layer is a molybdenum disulfide layer or a fluororesin layer. 3. The solenoid according to claim 2, wherein the surface of the zinc plating layer is chromate treated.