JP4087511B2 - Electromagnetic coupling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulating distance securing structure for an electromagnetic connection structure, which can surely secure an insulating distance between a field core and an electromagnetic coil. SOLUTION: A field core 20 is formed out of a cylindrical internal pole wall 21 enclosing a rotating shaft 10, a cylindrical external pole wall 22 faced to the cylindrical internal pole wall 21 while being spaced as specified from the internal pole wall, and of a disc plate wall 23 formed normal to an axial line connecting the internal pole wall with the external pole wall. A bobbin 60 to which an electromagnetic coil is wound up, is inserted into a space formed between the internal pole wall 21 and the external pole wall 22. A first and a second insulating cover 61 and 62 the whole of which is formed into a ring shape covering a space from both the sides of the space in the axial direction, are mounted to the bobbin 60. The first insulating cover 61 covers both a part of the outer circumference of the bobbin 60 and one side of the bobbin in the axial line direction, and the second insulating cover 62 covers both the other part of the outer circumference of the bobbin 60 and the other side of the bobbin in the axial line direction.

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coil insulation distance securing structure in an electromagnetic coupling device such as an electromagnetic clutch or an electromagnetic brake.
[0002]
[Prior art]
For example, as shown in FIG. 4, the conventional electromagnetic clutch includes a rotary shaft 1, a field core 2 that is fixed to a fixed portion (not shown) and rotatably supports the rotary shaft 1, and a rotor 3 that is fixed to the rotary shaft 1. The hub 4 is rotatably attached to the rotary shaft 1. The field core 2 includes a cylindrical inner pole wall 2a surrounding the rotation shaft 1, a cylindrical outer pole wall 2b facing the inner pole wall 2a at a predetermined interval, an inner pole wall, and an outer pole. It consists of a disk wall 2c formed by connecting the walls and perpendicular to the axis.
[0003]
A bobbin 6 around which an electromagnetic coil 5 is wound is inserted into a space formed between the inner pole wall 2a and the outer pole wall 2b of the field core 2. The bobbin 6 has a U-shaped cross section and is formed in a ring shape as a whole, and the electromagnetic coil 5 is wound around the U-shaped space of the bobbin from the outer periphery. The hub 4 is rotationally driven by a driving force from an electric motor (not shown). An armature 7 facing the rotor 3 is fixed to the hub 4 via a return leaf spring 8.
[0004]
In the above configuration, when the electromagnetic coil 5 is energized, the armature 7 is magnetically attracted to the rotor 3 and the rotation of the hub 4 is transmitted to the rotary shaft 1. When the energization of the electromagnetic coil 5 is cut off, the magnetic attraction force disappears, the armature 7 returns to the initial position away from the rotor 3 by the force of the leaf spring 8, and the transmission of the driving force from the hub 4 to the rotating shaft 1 is cut off. Is done.
[0005]
[Problems to be solved by the invention]
However, in the configuration of the conventional electromagnetic clutch described above, the electromagnetic coil 5 wound around the bobbin 6 is only fixed by an insulating tape or the like. Therefore, at the end of the bobbin 6 along the axial direction, the insulating tape is used. A gap is easily formed and the copper wire of the coil is easily exposed, the spatial distance between the outer pole wall 2b of the field core 2 and the coil 5, and the bobbin surface between the disk wall 2c of the field core 2 and the coil 5 There is a problem that a sufficient creepage distance cannot be secured.
[0006]
The present invention is to solve the problems (problems) in the conventional technology, and an object thereof is to provide an electromagnetic coupling equipment for an insulation distance between the field core and the electromagnetic coil can be reliably ensured.
[0007]
[Means for Solving the Problems]
Electromagnetic coupling equipment according to the present invention, in order to solve the above problems, cylindrical inner Gokukabe surrounding the rotary shaft, a cylindrical outer opposed with a predetermined distance with respect to the inner Gokukabe A field core having a disk wall formed by connecting the pole wall, the inner pole wall and the outer pole wall and perpendicular to the rotation axis, and a ring-like shape with a U-shaped cross-section opening on the outer periphery side. A bobbin inserted into the space between the inner and outer pole walls of the core, an electromagnetic coil wound around the U-shaped space of the bobbin, and an electromagnetic coil wound around the U-shaped space of the bobbin A first insulating cover that covers the coil, a part of the outer periphery of the bobbin and the one side part in the rotational axis direction, and another part of the outer periphery of the bobbin and the other side part in the rotational axis direction. second and an insulating cover, provided the first insulating cover and the second insulating cover at intervals in the rotation axis direction to cover It is characterized in that is.
[0008]
According to the above configuration, the first and second insulating covers are attached to the bobbin around which the electromagnetic coil is wound from different sides, and the field core inner and outer pole walls are integrated with each other. Insert in the space between. Since the outer periphery and side wall of the bobbin are covered with the first and second insulating covers, the electromagnetic coil wound around the bobbin is not exposed to the field core side, and the insulation distance between the field core and the electromagnetic coil is ensured. Can be secured.
[0009]
In this case, as the first and second insulating covers, members having the same shape formed in a ring shape with an L-shaped cross section can be used, and / or the first and second insulating covers are bobbins. You may form so that it may press-fit in the space between an outer periphery and the outer pole wall of a field core. Furthermore, the first insulating cover can be provided so as to cover a part of the second insulating cover on the outer periphery of the bobbin.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Below, an explanation will be given of embodiments of an electromagnetic coupling equipment in accordance with the present invention.
First Embodiment: FIG. 1 is a longitudinal front view showing an electromagnetic clutch as an electromagnetic coupling device according to a first embodiment of the present invention. The electromagnetic clutch according to the present embodiment rotates on a rotating shaft 10, a field core 20 fixed to a fixing portion (not shown) and rotatably supporting the rotating shaft 10, a rotor 30 fixed on the rotating shaft 10, and the rotating shaft 10. A hub 40 is attached which can be attached. The field core 20 includes a cylindrical inner pole wall 21 that surrounds the rotation shaft 10, a cylindrical outer pole wall 22 that faces the inner pole wall 21 at a predetermined interval, an inner pole wall, and an outer pole. The disk wall 23 is formed perpendicular to the rotation axis by connecting the wall.
[0011]
A bobbin 60 around which an electromagnetic coil 50 is wound is inserted into a space formed between the inner pole wall 21 and the outer pole wall 22 of the field core 20. The bobbin 60 is formed in a ring shape with a U-shaped cross section that opens to the outer peripheral side, and the electromagnetic coil 50 is wound around the U-shaped space of the bobbin 60 from the outer periphery. The bobbin 60 is attached with resin-made first and second insulating covers 61 and 62 that are formed in a ring shape from both sides in the axial direction.
[0012]
The first insulating cover 61 is a member having an L-shaped cross section composed of an outer peripheral portion 61 a covering the right side of the outer periphery of the bobbin 60 in the drawing and a side portion 61 b covering the right side of the axial direction in the drawing. On the other hand, it is fitted from the right side in the figure. The second insulating cover 62 is a member having an L-shaped cross section composed of an outer peripheral portion 62 a that covers the left side of the outer periphery of the bobbin 60 in the drawing and a side portion 62 b that covers the left side of the drawing in the axial direction. On the other hand, it is fitted from the left side in the figure. The first and second insulating covers 61 and 62 have the same shape.
[0013]
At the time of assembly, the first insulating cover 61 is fitted from the right side in the figure to the bobbin 60 around which the electromagnetic coil 50 is wound, and the second insulating cover 62 is fitted from the left side in the figure. Then, the bobbin 60 and the first and second insulating covers 61 and 62 are integrated into the space between the inner pole wall 21 and the outer pole wall 22 of the field core 20. Since the outer periphery and the side wall of the bobbin are covered with the first and second insulating covers, the electromagnetic coil 50 wound around the bobbin is not exposed to the field core 20 side, and the space between the field core 20 and the electromagnetic coil 50 is not An insulation distance can be ensured reliably.
[0014]
The hub 40 that can rotate around the rotation shaft 10 is a resin member having a gear formed around it, and is rotationally driven by a driving force from an electric motor (not shown). An armature 70 facing the rotor 30 is fixed to the hub 40 via a return leaf spring 80 so as to be displaceable in the axial direction.
[0015]
In the above configuration, when the electromagnetic coil 50 is energized, the armature 70 is magnetically attracted to the rotor 30 and the rotation of the hub 40 is transmitted to the rotary shaft 10. When the energization is cut off, the magnetic attraction force disappears, the armature 70 returns to the initial position away from the rotor 30 by the force of the leaf spring 80, and the transmission of the driving force from the hub 40 to the rotating shaft 10 is cut off.
[0016]
Second embodiment:
FIG. 2 is a cross-sectional view of a main part showing a second embodiment of the above-described insulation distance securing structure.
In the first embodiment, there is a space between the first and second insulating covers 61 and 62 and the outer pole wall 22 of the field core 20, but in the present embodiment, this space is closed. Thus, the first and second insulating covers are configured.
[0017]
FIG. 2 is a cross-sectional view of the main part showing a modification of the electromagnetic clutch described above. In the above embodiment, there is a space between the first and second insulating covers 61 and 62 and the outer pole wall 22 of the field core 20, but in the modified example of FIG. 1 and 2 constitutes a second insulating cover.
[0018]
On the other hand, the second insulating cover 64 includes an outer peripheral portion 64a that covers the left side of the outer periphery of the bobbin 60 and has a thickness in contact with the outer pole wall 22, and a side portion 64b that covers the left side of the axial direction in the drawing. Composed. The second insulating cover 64 is also L-shaped in cross section and is fitted to the bobbin 60 from the left side in the drawing. The first and second insulating covers 61 and 62 have the same shape.
[0019]
In the configuration of the second embodiment shown in FIG. 2, at the time of assembly, the first and second insulating covers 63 and 64 are fitted to and integrated with the bobbin 60, and these are integrated with the outer periphery of the bobbin 60 and the outside of the field core 20. Press fit into the space between the pole wall 22. As a result, the bobbin 60 can be reliably fixed to the field core 20.
When the same shape member is used as the first and second insulating covers as in the first and second embodiments shown in FIGS. 1 and 2, each cover can be managed as a common part. This makes it easy to manufacture and manage.
[0020]
Third embodiment:
FIG. 3 is a cross-sectional view of the main part showing the third embodiment of the present invention having the above-described insulation distance securing structure.
In the first and second embodiments shown in FIGS. 1 and 2, the first insulating cover and the second insulating cover are of the same type, and when these are mounted on the bobbin, there is a gap near the center of the bobbin. Occurs.
On the other hand, in the third embodiment shown in FIG. 3, the first and second insulating covers are partially overlapped on the outer peripheral portion of the bobbin 60 so that no gap is generated.
[0021]
FIG. 3 is a cross-sectional view of the main part showing another modification of the electromagnetic clutch described above. In the example of FIGS. 1 and 2, the first insulating cover and the second insulating cover are of the same type, and a gap is generated near the center of the bobbin when they are mounted on the bobbin. In the modified example of FIG. 3, the first and second insulating covers are partially overlapped on the outer peripheral portion of the bobbin 60 so that no gap is generated.
[0022]
In the configuration of the third embodiment shown in FIG. 3, the sum of the thickness of the outer peripheral portion 65 a of the first insulating cover 65 and the thickness of the outer peripheral portion 66 a of the second insulating cover 66 The distance between the pole wall 21 and the outer pole wall 22 is designed to be equal.
At the time of assembly, the second insulating cover 66 is first fitted onto the bobbin 60 from the left side in the drawing, and then the first insulating cover 65 is fitted on the second insulating cover 66 from the right side in the drawing. Then, the bobbin 60 and the first and second covers 65 and 66 are integrated into the space between the inner pole wall 21 and the outer pole wall 22 of the field core 20. By press-fitting from the side of the first insulating cover 65 having a large diameter, it is possible to prevent the second insulating cover 66 having a small diameter from shifting.
[0023]
According to the configuration of the present embodiment shown in FIG. 3, the bobbin 60 is securely attached to the field core 20 without increasing the thickness of each insulating cover as in the configuration of the second embodiment shown in FIG. 2. Can be fixed against.
Moreover, since there is no gap in the axial direction between the first and second insulating covers as in the configurations of the first and second embodiments, the insulation of the electromagnetic coil 50 can be made more reliable. .
[0024]
In each of the above embodiments, only the example in which the present invention is applied to the electromagnetic clutch has been described. However, the electromagnetic coupler is applicable not only to the electromagnetic clutch but also to an electromagnetic brake.
[0025]
【The invention's effect】
Electromagnetic coupling equipment according to the present invention has an excellent effect as a constructed as described above is described next.
(1) According to the configuration of the first aspect, since the bobbin is covered with the first and second insulating covers, the electromagnetic coil wound around the bobbin is not exposed to the field core side. Moreover, by dividing the cover into two members, the surface of the bobbin can be covered in three directions, and the insulation distance between the field core and the electromagnetic coil can be ensured reliably and quantitatively. it can.
[0026]
(2) When a member having the same shape, which is L-shaped in cross section and entirely formed in a ring shape, is used as the first and second insulating covers as in claim 2, each cover should be managed as a common part. Can be manufactured and managed easily.
[0027]
(3) When the first and second insulating covers are formed so as to be press-fitted into the space between the outer periphery of the bobbin and the outer pole wall of the field core as in the third aspect, the bobbin is securely attached to the field core. Can be fixed against.
[0028]
(4) When the first insulating cover is provided so as to cover a part of the second insulating cover on the outer periphery of the bobbin as in claim 4, the outer first insulating cover is connected to the outer pole wall of the field core. If it is press-fitted in between, the bobbin can be securely fixed to the field core without increasing the thickness of each insulating cover. Further, since there is no gap between the first and second insulating covers, the electromagnetic coil can be more reliably insulated.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view showing an electromagnetic clutch as an electromagnetic coupling device according to a first embodiment of the present invention.
FIG. 2 is a longitudinal front view of a main part showing an electromagnetic clutch as an electromagnetic coupling device according to a second embodiment of the present invention.
FIG. 3 is a longitudinal front view of a main part showing an electromagnetic clutch as an electromagnetic coupling device according to a third embodiment of the present invention.
FIG. 4 is a longitudinal front view showing the structure of a conventional electromagnetic clutch.

Claims (4)

A cylindrical inner pole wall surrounding the periphery of the rotation axis, a cylindrical outer pole wall facing the inner pole wall at a predetermined interval, and connecting the inner pole wall and the outer pole wall to the rotation axis And a field core having a disk wall formed vertically
A bobbin that is formed in a ring shape with a U-shaped cross section that opens to the outer peripheral side, and is inserted into a space between the inner and outer pole walls of the field core;
An electromagnetic coil wound around the U-shaped space of the bobbin;
A first insulating cover that covers a part of the outer periphery of the bobbin and a side portion on one side in the rotational axis direction;
A second insulating cover that covers the other part of the outer periphery of the bobbin and the other side of the rotation axis direction ;
Electromagnetic coupling equipment, characterized in that the first insulating cover and the second insulating cover is provided at intervals in the rotation axis direction. Said first, second insulating cover electromagnetic coupling equipment according to claim 1, total cross-sectional L-shape characterized in that it is a member of the same shape formed in a ring shape. It said first, second insulating cover electromagnetic coupling equipment according to claim 1 or 2, characterized in that it is pressed into the space between the outer Gokukabe of the outer and the field core of the bobbin. A cylindrical inner pole wall surrounding the periphery of the rotation axis, a cylindrical outer pole wall facing the inner pole wall at a predetermined interval, and the inner pole wall and the outer pole wall connected to each other for the rotation A field core with a disk wall formed perpendicular to the axis;
A bobbin that is formed in a ring shape with a U-shaped cross section that opens to the outer peripheral side, and is inserted into a space between the inner and outer pole walls of the field core;
An electromagnetic coil wound around the U-shaped space of the bobbin;
A first insulating cover that covers a part of the outer periphery of the bobbin and a side portion on one side in the rotational axis direction;
A second insulating cover that covers the other part of the outer periphery of the bobbin and the other side of the rotation axis direction;
The first insulating cover, in the outer periphery of the bobbin have covering a portion of the second insulating cover, and that to that electrostatic magnetic coupling, characterized in that is provided in contact with the inner periphery of the outer Gokukabe equipment.

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