JPH0525203Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is a system in which a non-magnetic spacer is installed and fixed, which is provided in order to optimize the shape of the adsorption end face of a fixed core and a movable core in a DC solenoid, and to prevent them from coming into close contact with each other. Regarding wet type solenoids.

[Conventional technology]

In a DC solenoid, if the movable core and fixed core are directly attracted during SOL-ON, the return at SOL-OFF will be extremely slow, so a spacer made of a non-magnetic material is usually interposed between the two cores. It is normal to prevent delays. However, if this spacer is thick, it will reduce the suction force and may change the suction force characteristics, so it is limited to the thickness necessary to improve responsiveness and is designed to be extremely thin. The mounting and fixing methods became difficult, the process became troublesome, and it became expensive.

[The problem that the idea aims to solve]

For example, as shown in FIG.
After the rod 25a is driven into the rod 6a and the rod 25a is crimped, an annular spacer 27a is passed through the rod to hold the rod. 26a, it is necessary to separately provide a V-groove-shaped oil passage 26a on the end face of the fixed iron core 23a, which increases the number of manufacturing steps and increases costs. Furthermore, for example, FIG. 7 is based on Utility Model Application No. 53-113046, and is a method in which an annular spacer 27b with one end split is provided with an elastic body that expands outward, and is fixed by pressing against the inner surface of a hollow tube 22b. However, the movable iron core 36b
If the stroke is large, there is a problem in that the spacer 27b may be tilted and crushed due to pressure fluctuations or the like.

The challenge of this invention is to optimize the shape of the mutually attracted end faces of the movable core and fixed core in a wet type DC solenoid, and to create a spacer that can be reliably and inexpensively fixed as a method of fixing a non-magnetic spacer used to prevent the two cores from coming into close contact with each other. An object of the present invention is to provide a wet type solenoid having the shapes of a fixed iron core and a movable iron core.

[Means to solve the problem]

Therefore, the present invention provides a wet type solenoid as described in the claims of the utility model registration.
The problems of the prior art described above have been solved.

〔Example〕

Embodiments of the present application will be described below with reference to the drawings. FIG. 1a is a schematic sectional view of a wet type solenoid according to an embodiment of the present invention, and shows a state where it is attached to a valve device 1. In the valve device 1, 2 is a valve body, and an oil passage 3 is formed inside.
In addition, as is well known, this oil passage 3 includes ports A and B (not shown) connected to a controlled device, a pressure port,
Tank ports etc. are connected. 4 is a spool that can move forward and backward in the direction of the arrow. A retainer 5 and a spring 6 are configured to press the spool 4 through the retainer 5.
7 is a terminal box installed on the valve body, 8
9 is a terminal fitting provided in the terminal box, and 9 is a connecting fitting, which is configured so that a plug pin 43 of a coil 40, which will be described later, can be connected thereto. It is designed so that lead wires can be connected.

Next, reference numeral 20 indicates a wet type solenoid according to an embodiment of the present invention, which includes a guide assembly 21 and a coil assembly 22 detachably attached to the outer circumferential side of the guide assembly 21. First, in the guide assembly 21, 23 is a fixed iron core made of a material with good magnetic properties, and is detachably screwed into the valve body 2 by a threaded portion 38. 2
4 is a through hole drilled in the fixed core 23, and the rod 2
5 is inserted. 26 is the through hole 24 and the rod 2
Fig. 5 shows a flow path configured to allow oil to flow between the Fig. 5 and Fig. 5; In FIG. 3, which is an enlarged view of the main part of FIG.
5' is formed into a convex shape having a large diameter portion φa27 and a small diameter portion φb28, and the small diameter portion 28 is further processed into a tapered shape so that the tip size diameter φc29 is smaller than φb. Also, the large diameter portion 27 and the small diameter portion 28
A groove 30 smaller than the small diameter portion 28φb is provided in the stepped portion, and the groove diameter φb is machined to be smaller than φb and larger than φc. 31 is a hollow tube,
It is constructed by welding a non-magnetic ring 32 and an end member 33, which is a magnetic material, at a welding part 101, and is further welded and fixed to a fixed iron core 23 at a welding part 102. Reference numeral 34 indicates a manually operated push pin inserted into a through hole 34' formed in the end member 33. 35
is a movable iron core that is housed inside a hollow tube so that it can move freely in the direction of the arrow, and is made of a magnetic material. The fixed core side suction surface of the movable core 35 is formed in a concave shape,
It is machined to create a gap 103 shown in FIG. 3 that does not come into contact with the convex portion of the fixed core.

Further, as shown in the cross-sectional view of the movable core 35 taken along line bb in FIG. 1a shown in FIG. It extends axially to the vicinity.

A spacer 37 fits into the groove 30 of the fixed core, and as shown in FIG. 2, which is an enlarged plan view, the spacer 37 has a C-shape and has elasticity that expands outward. Here, the inner diameter φe of the spacer is smaller than the small diameter portion 28φb of the fixed iron core 23,
It is designed to be larger than the tip diameter φc,
It has a structure in which it is fitted into a groove 30 of the fixed iron core 23 and fixed. The spacer 37 is made of a non-magnetic material (stainless steel, phosphor bronze, etc.), and its outer diameter is such that it leaves a considerable gap between it and the hollow tube.

Next, the coil assembly 22 will be explained. 41 is a case; 40 is a coil formed into a cylindrical shape into which the guide assembly 21 can be inserted; 42 is a yoke disposed at the end of the coil; 41 and 42 are made of magnetic material. 43 is a plug pin connected to the magnet wire of the coil 40. Reference numeral 44 indicates a molding material for fixing the coil 40 and plug pin 43, and plastic is used as the molding material.

Numeral 45 is a nut that connects the end member 104 of the guide assembly 21 and the threaded portion 10 of the end member 33 of the guide assembly 21 with the coil assembly 22 interposed therebetween.
5 and screwed together to form an integral structure.

Next, the operation will be described. In the device configured as described above, when the terminal fitting 8 is connected to a power source (not shown), the coil 40 is energized through the plug pin 43 of the connecting fitting 9. Furthermore, by energizing the coil 40, the movable iron core 35 is attracted toward the fixed iron core 23, and the spool 4 is switched.

It is known that the absorption force generated by energization of the coil 40 changes greatly depending on the shape of the adsorption end surfaces of the fixed core 23 and the movable core 35, but in general, solenoids used in switching valves are When flow begins, a large fluid reaction force is generated, so the design is such that a large suction force is generated at this time. In order to obtain such suction force characteristics, it is possible to obtain the suction end surfaces of the fixed core 23 and the movable core 35 by forming them in an uneven shape, but if the shape is simply uneven, only the characteristics shown in Fig. 4a can be obtained. , small diameter portion 28
By making it tapered, characteristics optimal for switching as shown in FIGS. 4b and 4c can be obtained, and switching performance can be improved.

Also, when the movable core is attracted to the fixed core, the third
As shown in the figure, since a spacer 37 is interposed between the fixed iron core 23 and the movable iron core 35, a gap 103 is formed between the two iron cores, and an oil passage 46 for oil circulation is defined. Therefore, the oil flow due to the movement of the movable core 35 and the movement of the rod 25 as described above, that is, the movement of the movable core 3 in the oil passage 3 in the valve device 1 and inside the hollow pipe 31.
5 and the space 47 on the end member 33 side, oil can flow through the oil passage 26 and the oil passage 46 in a good manner.

Next, when the coil 40 is de-energized, the movable iron core 35 is opened. That is, in the valve device 1 shown in FIG. 1, the spool 4 moves the movable core 35 to the left in FIG. 1 via the rod 25 by the force of the spring on the side not shown. In this case, since the spacer 37 between both cores is interposed and there is a gap 103, there is no residual magnetism or oil trapped between the plungers, and the movable core 35 is immediately released without coming into close contact with the fixed core 23. and move. That is, even in this case, the oil flows between the oil passage 3 and the space 47 on the left side of the movable iron core 35 without any problem, and the movable iron core 35 operates smoothly.

FIG. 5 shows another embodiment of the spacer. The spacer 48 is shaped like a horseshoe and can be used by inserting it into the groove 30 of the fixed iron core 23 at right angles and fitting it therein, and the edge 106 prevents it from coming off.

[Effect of idea]

As explained above, in the present invention, the spacer is fitted and held in the groove provided between the large diameter part and the small diameter part of the convex part of the suction end surface of the fixed core.
There is no need to worry about it leaning or collapsing during operation.
In addition, the small diameter part of the fixed core is tapered,
Insertion can be facilitated by appropriately selecting the inner diameter of the spacer. Furthermore, the suction end face shape of both iron cores was selected to have an optimal shape suitable for switching the suction force characteristics of the solenoid, and even if the movable iron core is activated, the oil path between the end member side of the movable iron core in the hollow tube and the Since it never closes, it can operate smoothly and provide stable switching.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a wet type solenoid according to an embodiment of the present invention, Fig. 2 is an enlarged plan view of the spacer shown in Fig. 1, Fig. 3 is a partially enlarged view of Fig. 2, and Fig. 4 shows the solenoid stroke. FIG. 5 is an enlarged plan view of a spacer different from the spacer shown in FIG. 3, and FIGS. 6 and 7 are sectional views of essential parts of a conventional wet type solenoid. 23... Fixed iron core, 25... Rod, 30...
Groove portion, 31...Hollow tube, 35...Movable iron core, 36
...Oil flow passage, 37, 48...Spacer, 40...
…coil.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) It has a fixed core, a movable core that can move near and far toward the fixed core, and a coil that can move the movable core depending on whether or not it is energized,
The movable core is housed in a cylindrical hollow tube, and an oil flow passage is formed on the side that is long in the axial direction and opens at both ends.A fixed core is placed and fixed on one side of the hollow tube. A rod is installed through the fixed core so that it can be driven by the operation of the movable core, and when the movable core and the rod are in operation, an oil passage installed in parallel with the rod and an oil passage between the fixed core and the movable core are inserted. and a wet type solenoid in which oil is allowed to flow through the oil flow passage, wherein the movable core has a concave shape with a small diameter portion of the suction end surface tapered, and the fixed core has a concave shape with a small diameter portion of the suction end surface. The fixed iron core is formed into a tapered convex shape so as to complement the small diameter part, and grooves are provided in the stepped parts of the large diameter part and the small diameter part of the fixed core, and the grooves are made of a non-magnetic material. The spacer is a C-shaped spacer, the distance between the ends of the C-shape is smaller than the maximum diameter of the small diameter part of the fixed iron core, and the outer diameter is such that a considerable gap is left between the spacer and the hollow tube. 1. A wet type solenoid, wherein the solenoid is installed and fixed, and the oil flow passage of the movable iron core extends in the axial direction to the vicinity of the rod. (2) The wet type solenoid according to claim 1, wherein a retaining edge is provided inside the C-shaped end of the spacer.