JP2531194Y2 - Solenoid device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a solenoid device used as an operating device such as a hydraulic control valve.

(Prior Art) As a conventional solenoid device of this type, there is one as shown in FIG. 4, for example. That is, a center post 102 made of a magnetic material is inserted and fixed in a liquid-tight state around the inner periphery of one opening of a solenoid main body 101 having a coil 100 and formed into a cylindrical shape having both ends opened. A movable member 103 made of a magnetic material is reciprocally inserted into the inner circumference of the other opening, and is normally separated from the center post 102 by the spring force of a spring 104. By energizing the coil 100, the movable member 103 is magnetically attracted to the end face of the center post 102 against the spring force of the spring 104.
The movable member 103 has a guide shaft 106 slidably inserted into an inner periphery of a guide hole 105 opened at an end face of the center post 102.
Are provided, and the movable member 103 is slidably guided.

When such a solenoid device is used for controlling a hydraulic control valve or the like, for example, the spool is stroked by an operating rod 107 provided integrally with the movable member 103 to control the opening and closing of the valve. Fluid such as oil to be controlled, such as pressure oil, flows into the solenoid device, which greatly affects the operation of the movable member 103.

In this conventional example, a through hole 108 that penetrates the operating rod 107 and the guide shaft 106 is provided to communicate the external space A with the second internal space B2 in the guide hole 105.
2, a radial passage 109 communicating the second internal space B2 in the guide hole 105 with the first internal space B1 between the center post 102 and the movable member 103 is provided, and through the radial passage 109 and the through hole 108, Fluid is circulated between the first internal space B1, the second internal space B2, and the external space A so that the movable member 103 moves smoothly.

(Problems to be Solved by the Invention) However, in the case of the above-described conventional technique, the center post 102 and the first internal space B1 between the movable members 103 are communicated through the second internal space B2 in the center post 102. Therefore, there is a problem that the total length of the oil passage becomes longer, the resistance increases, and the movable member 103 still does not move smoothly. In particular, when operating at high speed, the operation becomes insufficient.

The present invention has been made in order to solve the above-described problems of the related art, and an object thereof is to provide a solenoid device capable of more smoothly flowing a fluid between an internal space and an external space, Accordingly, the operation of the movable member is performed more smoothly.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, a cylindrical solenoid body having a coil and having both ends opened, and a liquid inside the one opening of the solenoid body. A magnetic center post closely inserted and fixed; a magnetic movable member reciprocally inserted into the other opening of the solenoid body; and a movable member interposed between the center post and the movable member. And a spring for urging the movable member away from the center post, wherein the movable member is provided with a guide shaft slidably inserted into an inner periphery of a guide hole provided in the center post, and A solenoid device having a passage allowing fluid flow between the first internal space between the movable members and the second internal space behind the guide hole of the center post and the external space; The movable member, the first between the movable member and the center post
The inner space communicates with the outer space, and one end thereof is the first
A first communication path that opens directly into the internal space is provided, and a second communication path that communicates the second internal space behind the guide hole with the first internal space is further provided.

(Operation) In the solenoid device having the above configuration, when the coil of the solenoid body is energized, the center post is excited and the movable member is magnetically attracted to the end face of the center post. At this time, the first internal space between the movable member and the center post and the second internal space behind the guide hole of the center post become narrower, and the fluid in the first internal space flows into the first internal space via the second communication passage. The fluid that has flowed out and has been present in the first internal space flows out to the external space via the first communication path.

Next, when the energization of the coil is stopped, the movable member is separated from the center post by the spring force of the spring, and the first and second internal spaces are expanded. Thus, the fluid flows into the first internal space through the first communication passage, and flows from the first internal space into the second internal space through the second communication passage.

As described above, since the first internal space communicates directly with the external space through the first communication passage, the length of the passage is shortened, the flow passage resistance is reduced, and the movable member moves smoothly.

(Example) Hereinafter, the present invention will be described based on an illustrated example.
1 to 3 show a solenoid device according to an embodiment of the present invention. The solenoid device 1 includes a cylindrical solenoid body 2 having both ends opened, a center post 3 made of a magnetic material inserted and fixed in a liquid-tight manner inside one opening of the solenoid body 2, and the solenoid body 1. And a movable member 4 made of a magnetic material which is reciprocally inserted into the other opening of the second member.

The solenoid body 2 has a cylindrical case forming a magnetic path.
21 and a coil 22 incorporated in the inner periphery of the case 21. The case 21 includes a large-diameter case main body 211 in which the coil 22 is housed, and a small-diameter mounting end 212 protruding from one end of the case main body 211.

The coil 22 is wound around a cylindrical bobbin 221, and one end surface of the bobbin 221 is in contact with a step 213 at the boundary between the case body 211 and the mounting end 212. On the other hand, the other end surface of the bobbin 221 is in contact with an upper plate 214 which is caulked and fixed to the open end of the case body 211, and an O-ring 215 for sealing is mounted between the contact surfaces of both ends of the bobbin 221. . The upper plate 214 is a washer-shaped member whose inner end is connected and fixed to the center post 3 to form a magnetic path between the case 21 and the center post 3.

The movable member 4 is formed integrally with a plunger 41 made of a magnetic material, a guide shaft 43 made of a non-magnetic material and protruding from an end face of the plunger 41 facing the center post 3, and penetrating the plunger 41 in the central axis direction. And an operating rod 42 that is assembled to the control rod.

On the other hand, the end of the center post 3 is inclined in a truncated cone shape, and a guide hole 31 is provided in the center of the center post 3 through which the guide shaft 43 of the movable member 4 is slidably inserted via a bearing 8. I have. The guide hole 31 is penetrated, and a spring adjusting screw 11 is screwed into the opening thereof in a liquid-tight manner. A spring 10 for urging the movable member 4 in a direction to separate the movable member 4 from the center post 3 is interposed between the spring adjustment screw 11 and the guide shaft 43. Further, an inward flange 216 is formed at the opening edge of the mounting end 212 of the case 21 so as to function as a stopper for the plunger 41.
The plunger 41 is slidably guided via a bearing 9 fitted on the inner periphery of the mounting end 212 of the case 21.

The movable rod 4 constituting the movable member 4 includes a movable member 4
The first internal space B1 between the plunger 41 and the center post 3 communicates with the external space A, and one end thereof is connected to the first internal space.
A first communication path 6 that opens directly to B1 is formed through.
The opening of the first communication passage 6 into the first internal space B1 is provided with a two-plane width portion 61 at the end of the operating rod 42, and the two-plane width portion 61 has a lateral hole 62 communicating with the rod hollow portion 63. It is provided and configured.

The diameter of the two flat portions 61 is the guide hole 31 of the center post 3.
The passage is secured even at the stroke end where the plunger 41 strokes toward the center post 3 side, and the movement of the movable member 4 is hindered by the oil pool in the second internal space B2 in the center post 3. Not to be.

On the other hand, between the sliding surface between the guide shaft 43 and the inner periphery of the guide hole 31, a first internal space B 1 and a second internal space B 2 behind the guide hole 31 are provided.
And a second communication path 7 that communicates with. This second
In this embodiment, the communication passage 7 is formed by providing a groove 71 on the inner peripheral surface of the bearing 8 that slides and guides the guide shaft 43. The bearing 8 is made of various materials such as sintered metal. Of course, a groove may be provided on the outer periphery of the guide shaft 43 without providing the groove 71 on the inner periphery of the bearing 8, and when the guide shaft 43 is directly slidably contacted with the inner periphery of the guide hole 31 without providing the bearing 8. Alternatively, a groove may be provided on the inner circumference of the guide hole 31 itself. Further, similarly to the operation rod 42, the guide shaft 43 may be hollow to form an internal passage, and the first internal space B1 and the second internal space B2 may be communicated via the internal passage. A radial passage may be formed in the center post 3 so as to communicate therewith. However, if the second communication path 7 is formed between the sliding surface of the bearing 8 and the guide shaft 43 as in this embodiment, the guide shaft 43 does not need to be hollow, and the processing is very simple.

In the solenoid device having the above-described structure, when the coil 22 of the solenoid body 2 is energized, the center post 3 is excited, and the movable member 4 is magnetically attracted to the end face of the center post 3 so that the operating rod 42 contracts and the guide The shaft 43 sinks into the guide hole 31. At this time, the first internal space B1 between the movable member 4 and the center post 3 and the guide hole of the center post 3
31 The second inner space B2 at the back becomes narrower, and the fluid in the second inner space B2 flows out to the first inner space B1 via the second communication passage 7,
The fluid existing in the first internal space B1 flows out to the external space A via the first communication path 6.

Next, when the energization of the coil 22 is stopped, the movable member 4 is separated from the center post 3 by the spring force of the spring 10, and
1. The second internal space B1, B2 expands. Thereby, the fluid flows into the first internal space B1 through the first communication passage 6, and flows from the first internal space B1 into the second internal space B2 through the second communication passage 7.

As described above, since the first communication passage 6 is directly opened to the first internal space B1, the length of the passage is shortened, the flow of fluid such as oil when the solenoid is operated becomes smooth, and the movement of the movable member 4 is improved. Becomes smoother.

(Effect of the Invention) The present invention has the above configuration and operation, and directly opens a first communication passage communicating the first internal space between the movable member and the center post with the external space to the first internal space. And a second communication passage connecting the first internal space and the second internal space of the guide hole of the center post is provided, so that the external space and the first internal space are separated from each other as in the conventional case. The length of the passage can be reduced as compared with the case where the communication is performed through the space, the flow path resistance is reduced, and the movable member can be moved smoothly.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a solenoid device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG.
FIG. 4 is a vertical sectional view of a conventional solenoid device. DESCRIPTION OF SYMBOLS 1 ... solenoid device 2 ... solenoid body 21 ... case, 211 ... case body 212 ... mounting end, 213 ... stepped portion 214 ... upper plate 215 ... O-ring, 216 ... inward flange 22 ... coil, 221 ... bobbin 3 ... Center post, 31 ... Guide hole 4 ... Movable member, 41 ... Plunger 42 ... Working rod, 43 ... Guide shaft 6 ... First communication path, 61 ... Width across flat 62 ... Side hole, 63 ... Rod hollow part 7 ... No. 2 communicating passages, 71 grooves, 9 bearings, 10 springs 11 spring adjustment screws A: external space, B1: first internal space B2: second internal space

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylindrical solenoid body having a coil and both ends open, a center post made of a magnetic material inserted and fixed in a liquid-tight manner inside one opening of the solenoid body, and the other of the solenoid body A movable member made of a magnetic material that is reciprocally inserted into the opening of the movable member; and a spring that is interposed between the center post and the movable member and biases the movable member away from the center post. The member is provided with a guide shaft slidably inserted into an inner periphery of a guide hole provided in the center post, a first internal space between the center post and the movable member, and a second internal space behind the guide hole of the center post. A solenoid device having a passage that allows fluid to flow between a space and an external space, wherein the movable member has a first internal space between the movable member and a center post, A first communication passage communicating with the space and having one end open directly to the first internal space; and a second communication passage communicating the second internal space behind the guide hole with the first internal space. A solenoid device having a passage.