JP3503236B2 - Electromagnetic device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic device for controlling the movement of a movable core by energizing a coil, of which an output rod is integrally attached to the movable core. And a supporting portion for slidably supporting the supporting member. 2. Description of the Related Art A conventional electromagnetic device will be described with reference to FIG. 10 has a cylindrical bottom 10A on the other side A (the right side in FIG. 2), and the cylindrical portion 1 extends from the outer peripheral end of the bottom 10A toward one side B (the left side in FIG. 2).
Reference numeral 0B denotes a bottomed cylindrical housing formed with an opening, and an annular locking step 10D is formed near the open end 10C of the cylindrical portion 10B. A first fixed core 10E is formed on an inner portion of the bottom portion 10A so as to protrude toward one side B, and the first fixed core 10E is formed from one side end 10F of the first fixed core 10E to the other side A. A first movable core guide hole 10G is formed toward the first movable core guide hole 10G from the inner bottom portion 10H on the other side of the movable core guide hole 10G toward the other side A. A hole 10J is drilled. [0003] Reference numeral 11 denotes a flange-shaped yoke arranged on the locking step portion 10D of the housing 10. The second fixed core 11B is formed by projecting from the other end surface 11A of the yoke 11 toward the other side A. Is done. This second fixed core 11
B, a second movable core guide hole 11D is formed from the other end 11C toward one side B of the second movable core guide hole 1D.
A second support hole 11F is formed concentrically with the second movable core guide hole 10D from the inner bottom 11E of the 1D toward one side B. [0004] The locking step 10D of the housing 10
The other side end face 11A of the yoke 11 is arranged on the upper side, and the one side end 10F of the first fixed core 10E and the other side end 11C of the second fixed core 11B are opposed to each other with a gap S therebetween. In this state, an annular gap 12 is formed between the inner peripheral surface of the cylindrical portion 10B of the housing 10 and the outer peripheral surfaces of the first fixed core 10E and the second fixed core 11B. The first movable core guide hole 10G and the second movable core guide hole 11D of the second fixed core 11B are disposed concentrically and opposed to each other, and further, the first support hole 10J and the second support hole 11F.
And are arranged concentrically. [0005] A coil 14 wound around a coil bobbin 13 is disposed in the annular gap 12, and a columnar movable core 15 is provided in the first movable core guide hole 10G and the second movable core guide hole 11D. Be placed. An output rod 16 penetrates and is integrally attached to the center of the movable core 15. The other shaft portion 16 </ b> A of the output rod 16 is first supported via a bearing member 17 such as a wound bush. The output shaft 16 is slidably supported by the hole 10J, and the one side shaft portion 16B of the output rod 16 is slidably supported by the second support hole 11F via the bearing member 17. The housing 10, the first fixed core 10
E, the second fixed core 11B, the yoke 11, and the movable core 15 are formed of a magnetic material. And coil 1
When the power is supplied to the power rod 4, the movable core 15 moves by the electromagnetic thrust, and this movement is output to the outside via the end of the one side shaft portion 16 </ b> B of the output rod 16. [0006] According to such a conventional electromagnetic device, the magnetic path G generated by energizing the coil 14 includes the bottom 10 A of the housing 10, the first fixed core 10 E, and the movable core 15. , The second fixed core 11B, the yoke 11, and the cylindrical portion 10B of the housing 10. At this time, a support portion of the bearing member 17 that supports the output rod 16 is disposed in the magnetic path. This magnetic path G is shown by a chain line in FIG.
According to the above, the magnetic path generates magnetic poles in the bearing member 17 and the other shaft portion 16A of the output rod 16 and in the bearing portion between the bearing member 17 and the one shaft portion 16B of the output rod 16. . When such an electromagnetic device is used as a drive actuator of a solenoid valve for controlling a hydraulic pressure of an automatic transmission of an automobile, for example, foreign matter (contamination and the like) existing in an oil passage is easily attracted to the bearing portion, Further, the foreign matter which has entered easily adheres to the bearing portion. Therefore, when used for a long period of time, there is a problem in durability of the bearing portion. In order to improve the durability, material selection of the bearing portion,
Many development man-hours are required to select the surface hardness and treatment, which is not preferable because it leads to an increase in product development costs. Further, when a general commercially available material cannot be used as the bearing member, the cost of the product increases. Further, when a general commercially available material is used as the bearing member, the gap formed between the output rod and the bearing member is uniquely determined, and it is difficult to keep the gap minute. That is, the fall of the movable core 15 cannot be suppressed to the minimum. Furthermore, the fact that the bearing member 17 is disposed relatively close to the movable core 15 and the supporting length L of the bearing member 17 cannot be sufficiently large leads to the fact that the movable core 15 cannot be prevented from falling down. According to the above, improvement of the hysteresis characteristics during the movement of the movable core cannot be desired. The electromagnetic device according to the present invention has been made in view of such a problem, and improves the durability of a bearing portion of an output rod which is formed integrally with a movable core and slides with an extremely inexpensive structure. And to improve the hysteresis characteristics of the movable core. In order to achieve the above-mentioned object, an electromagnetic device according to the present invention comprises a bottomed cylindrical housing, a coil, a first fixed core, a second fixed core, and an output. In an electromagnetic device housing and disposing a movable core having a rod, a magnetic material
A first fixed core projecting from the bottom toward one side is formed at the bottom of the bottomed cylindrical housing formed by the material, and a first bearing projection projects from the bottom toward the other side. Provided at the open end of the housing ,
The flange-shaped yoke made of magnetic material has
A second fixed core projecting from the yoke toward the other side is formed, and a second bearing projection is provided projecting from the yoke toward the one side to provide an output rod integrally attached to the movable core. In the first support hole that drills the other side shaft part in the first bearing projection
The output rod is directly slidably supported, and one side shaft portion of the output rod is directly slidably supported in a second support hole formed in the second bearing projection. According to the above construction of the present invention, the first support portion formed by the other shaft portion of the output rod and the first support hole, and the first support portion formed by the one shaft portion of the output rod and the second support hole. 2 can be removed from the magnetic path, and according to this, no magnetic pole is generated in the first support portion and the second support portion. Thus, it is possible to prevent the foreign matter in the oil passage from being sucked into the support portion or the foreign matter that has flowed in. The first support hole is formed in the other side from the bottom of the housing, the second support hole is formed on one side than the yoke, the output rod by the supporting hole
Since the supporting length of the movable core can be made longer than before, it is possible to prevent the movable core from falling down, and to thereby improve the hysteresis characteristics when the movable core moves. FIG. 1 shows an embodiment of an electromagnetic device according to the present invention. Reference numeral 1 denotes a bottomed cylindrical housing formed by opening a cylindrical portion 1B from the outer peripheral end of a cylindrical bottom portion 1A toward one side B, and having a ring shape near the open end 1C of the cylindrical portion 1B. Is formed. The bottom 1 </ b> A has a first
Of the first fixed core 1E, a first movable core guide hole 1G is formed from one end 1F of the first fixed core 1E toward the inside of the bottom 1A, and further, an outer peripheral side surface of the other side of the bottom 1A. A first bearing projection 1J is continuously provided from 1H toward the other side A. Then, a first support hole 1L is formed from the inner bottom 1K formed in the bottom 1A of the first movable core guide hole 1G into the first bearing protrusion 1J. The first support hole 1L and the first movable core guide hole 1G are formed concentrically. In particular, the first support hole 1L is formed in the first bearing projection 1J and formed in the bottom 1A of the housing 1. must not. Reference numeral 2 denotes a flange-shaped yoke disposed on the locking step portion 1D of the housing 1. The second fixed core 2B projects from the other end surface 2A of the yoke 2 toward the other side A. And one side B from one side end surface 2C of the yoke 2.
A second bearing projection 2D is formed so as to project toward. A second movable core guide hole 2F is formed from the other end 2E of the second fixed core 2B toward one side B, and further from the bottom 2G of the second movable core guide hole 2F to one side B. An escape hole 2H and a second support hole 2J are provided continuously. These second movable core guide holes 2F, relief holes 2H, and second support holes 2J
Are formed concentrically, and in particular, the second support holes 2
J must be formed on a second bearing projection 2D that projects from the yoke 2 toward one side B. The second support hole 2J must not be drilled in the yoke 2 and the second fixed core 2B. Then, the other end surface 2A of the yoke 2 is arranged on the locking step 1D of the housing 1, and the first fixed core 1E
And one end 1F of the second fixed core 2B and the other end 2E of the second fixed core 2B are opposed to each other with a gap S therebetween. In this state, the inner peripheral surface of the cylindrical portion 1B of the housing 1 and the first fixed core 1E
Annular gap 3 between the first fixed core 2B and the outer peripheral surface of the second fixed core 2B
Are formed, and the first movable core guide hole 1G of the first fixed core 1E and the second movable core guide hole 2F of the second fixed core 2B are concentrically opposed to each other. It is arranged concentrically with the second support hole 2J. A coil 5 wound around a coil bobbin 4 is arranged in the annular gap 3, and a cylindrical movable core 6 is provided in the first movable core guide hole 1G and the second movable core guide hole 2F. Is arranged. An output rod 7 penetrates and is integrally attached to the center of the movable core 6, and the other side shaft portion 7A of the output rod 7 is slidably supported by the first support hole 1L. One side shaft portion 7B of the output rod 7 is slidably supported in the second support hole 2J. Thus, the output rod 7 is connected to the first support hole 1L.
The movable core 6 can move within the first movable core guide hole 1G and the second movable core guide hole 2F. The housing 1, the first
The fixed core 1E, the second fixed core 2B, the yoke 2, and the movable core 6 are formed of a magnetic material. Therefore, the first bearing protrusion 2J and the yoke 2 are integrally formed with the housing 1.
The second bearing protrusion 2D integrally formed with the second member is also formed of a magnetic material. Next, the operation will be described. Coil 5
When power is supplied to the housing 1, the magnetic path K is formed by the cylindrical portion 1B of the housing 1, the yoke 2, the second fixed core 2B, the movable core 6, the first fixed core 1E, and the bottom 1A of the housing 1, The magnetic path K is indicated by a dashed line in FIG. 1.) An electromagnetic thrust proportional to the current value applied to the coil 5 can be generated in the movable core 6. The movable core 6 slidably supported by the first support hole 1L and the second support hole 2J via the output rod 7 includes a first movable core guide hole 1G,
The movable core 6 moves in the axial direction in the second movable core guide hole 2F, and the movement of the movable core 6 is output as a position change outward from one side end of one side shaft portion 7B of the output rod 7. Here, according to the electromagnetic device of the present invention,
Other shaft 7 of output rod 7 integrally attached to movable core 6
A first support hole 1L that slidably supports A is bored in a first bearing projection 1J that projects toward the other side A from the other outer peripheral side surface 1H of the bottom 1A of the housing 1; The first support hole 1L is not located in the magnetic path K passing through the first fixed core 1E, the bottom 1A of the housing 1, and the cylindrical portion 1B, but is located at a position away from the magnetic path K to the other side A. Placed in On the other hand, a second support hole 2J slidably supporting the one side shaft portion 7B of the output rod 7 is formed in a second bearing protrusion 2D protruding from the yoke 2 toward one side B. The second support hole 2J is a cylindrical portion 1B of the housing 1,
The yoke 2 is not disposed in the magnetic path K passing through the second fixed core 2B, but is disposed at a position away from the magnetic path K to one side B. As described above, the first support hole 1L and the second support hole 2J that slidably support the output rod 7 are arranged outside the magnetic path K formed by energizing the coil 5. When the coil 5 is energized, magnetic poles are formed between the other shaft 7A of the output rod 7 and the first support hole 1L and between the one shaft 7B of the output rod 7 and the second support hole 2J. It does not occur. Therefore, the foreign matter existing in the oil passage (not shown) is not attracted to the bearing of the output rod 7 by the magnetic pole, or the foreign matter near the bearing does not adhere to the bearing. As described above, according to the electromagnetic device of the present invention, when the electromagnetic device is used for a long period of time, the occurrence of sliding wear in the sliding portion of the support hole or the output rod can be suppressed. A remarkable improvement in the durability of the sliding portion was achieved. The fact that the durability can be improved for the above-described reason means that the selection of the material, hardness, surface treatment, etc. for the sliding portion does not require much development man-hours, and the product development cost is reduced. It was done. According to the electromagnetic device of the present invention, the hysteresis characteristic of the movable core 6 can be improved. This is for the following reason. First, a first support hole 1L that slides and supports the other shaft 7A of the output rod 7 is located on the other side A of the bottom 1A of the housing 1 and slides on one shaft 7B of the output rod 7. The second support hole 2J to be supported is located on one side B of the yoke 2 so that the support length L of both bearings can be made sufficiently large, and the output rod 7 and the movable core 6 can be prevented from falling down. . Second, the output rod 7 is directly slidably supported by the first support hole 1L and the second support hole 2J, and the diameter of the support holes 1L and 2J is determined by the outer diameter of the output rod 7. And the output rod 7 can be supported with a small gap by the support holes 1L and 2J. According to the above, the falling of the output rod 7 and the movable core 6 supported by the support holes 1L and 2J can be suppressed within an extremely small range. Third, the first movable core guide hole 1G, the second
Movable core guide hole 2F, first support hole 1L, second support hole 2
This is because J's concentricity was accurately determined. This is because the first movable guide hole 1G and the first support hole 1L can be precisely machined with one chuck when the housing 1 is turned, while the second movable core guide hole 2F and the second support hole 1F are formed. This is because the hole 2 </ b> J can be accurately machined by one chuck when the yoke 2 is turned. As described above, the concentricity between the movable core guide hole and the support hole is accurately provided, so that the output rod 7 and the movable core 6 can be prevented from falling down. Further, according to the fact that the output rod 7 is directly slidably supported by the first and second support holes 1L and 2J without using a bearing member, the number of parts and the number of assembling steps can be reduced. This is effective in reducing the manufacturing cost. As described above, according to the electromagnetic device of the present invention, the bottom of the bottomed cylindrical housing formed of a magnetic material protrudes from the bottom toward one side B. A first fixed core is formed, and a first bearing protrusion is provided so as to protrude from the bottom toward the other side A. The first bearing protrusion is disposed at an open end of the housing, and is provided on a flange-shaped yoke formed of a magnetic material. Project from the yoke toward the other side A
And a second bearing projection is provided to project from the yoke toward one side B, and the other shaft portion of the output rod integrally attached to the movable core is provided to the first bearing. directly slidably supported on the first support hole so bored in projection, straight into the second support hole drilled to the one side shaft portion of the output rod to the second bearing protrusion
Having indirectly slidably supported, it is possible to output rod and the first support hole and the output rod and the second support hole, the sliding support unit according to, placed outside the magnetic path is caused by the coil In addition, a magnetic pole is not generated in the sliding support portion, so that an electromagnetic device having excellent durability can be provided.
The output rod is supported in the first support hole and the second support hole with a very small gap, and particularly, the first support hole and the second support hole can be precisely and concentrically arranged. Thus, the output rod is prevented from falling down, and the hysteresis characteristics can be improved. Furthermore, the support of the output rod
Since the sliding member is directly slidably supported by the support hole without the intervention of the bearing member, the number of parts and the number of assembling steps can be reduced to reduce the manufacturing cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing one embodiment of an electromagnetic device according to the present invention. FIG. 2 is a longitudinal sectional view showing a conventional electromagnetic device. [Description of Signs] 1 housing 1A bottom 1E first fixed core 1J first bearing protrusion 1L first support hole 2 yoke 2B second fixed core 2D second bearing protrusion 2J second support hole 5 coil 6 movable core 7 Output rod 7A Other shaft 7B One shaft A Other side B One side

Claims (1)

(1) An electromagnetic device in which a coil, a first fixed core, a second fixed core, and a movable core having an output rod are housed and arranged in a bottomed cylindrical housing. , A bottomed cylindrical housing 1 formed of a magnetic material
Projecting from the bottom 1A toward one side B from the bottom 1A.
A first fixed core 1E is formed, and a first bearing protrusion 1J is provided so as to protrude from the bottom 1A toward the other side A. The first fixed core 1E is disposed at the open end 1C of the housing 1 and is made of a magnetic material.
A second fixed core 2B protruding from the yoke 2 toward the other side A is formed on the flange-shaped yoke 2 formed at the same time, and a second bearing protrusion 2D is formed from the yoke 2 toward one side B. Of the output rod 7 which is integrally attached to the movable core 6.
A directly into the first support hole 1L formed in the first bearing projection 1J.
To slidably supported, one side shaft portion 7B of the output rod 7 second
An electromagnetic device, wherein the electromagnetic device is directly slidably supported in a second support hole 2J formed in the bearing protrusion 2D.