JP2000055083A - Device for exciting electromagnetic coupling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly hold a coil bobbin in a coil holding groove in a field core, and prevent a lining secured to the opening of the coil holding groove. SOLUTION: The bottom part 4a of a spool of a coil bobbin 4 is integrally formed at its one side surface with a plurality of protrusions 4c which are deformed when a holding plate 6 is press-fitted in the opening of a coil holding groove 4a. Further, a lining 7 is formed in its inner peripheral surface with a flat surface which is fitted to a flat surface formed in the inner peripheral surface of the coil holding groove 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exciting device provided in an electromagnetic coupling device such as an electromagnetic clutch or an electromagnetic brake, and more particularly to an exciting device in which a coil bobbin in which an exciting coil is wound in multiple rows is housed. Things.

[0002]

2. Description of the Related Art Conventionally, as described in Japanese Utility Model Laid-Open Publication No. Sho 54-32643, an exciter for an electromagnetic coupling device includes a coil bobbin made of a synthetic resin material on which an exciting coil is wound.
It is accommodated in a coil accommodating groove of a field core formed by pressing a steel plate. The coil bobbin disclosed in the above publication has a cylindrical bobbin bottom, and a disk-shaped bobbin side portion individually extending radially outward from both ends of the bobbin bottom. A coil holding groove is defined by the frame side. Further, a protruding portion which is press-fitted into the inner peripheral wall or the outer peripheral wall of the coil accommodating groove of the field core is integrally formed on the inner peripheral surface of the reel bottom or the outer peripheral surface of the reel side. Then, the coil bobbin is held in the coil receiving groove of the field core by pressing and deforming the protrusion.

[0003]

The conventional exciter of the electromagnetic coupling device can omit the work of pouring resin for holding the coil bobbin into the coil accommodating groove of the field core and heating and curing the resin. Thus, the productivity has been improved and the cost of the excitation device has been reduced. However, the protrusion formed on the inner peripheral surface of the bottom of the bobbin of the coil bobbin and the protrusion formed on the outer peripheral surface of the side of the bobbin of the coil bobbin are:
When the coil bobbin is press-fitted into the coil receiving groove of the field core, the coil bobbin is pressed and deformed at the corner of the opening of the coil receiving groove, and is rubbed against the wall surface of the coil receiving groove in the pressed and deformed state, so that the coil bobbin is held. It is not possible to obtain sufficient wedge force at the protrusions to perform the above-mentioned operations.

[0004] In particular, exciting devices incorporated in automobiles include:
Since a large external vibration frequently acts, the coil bobbin is likely to vibrate when used for a long time in a state where the wedge force is not sufficiently obtained. In addition, when the coil bobbin vibrates, the connection between the winding end of the exciting coil and the lead wire is cut, and the current supply to the exciting coil is cut off.

[0005] An electromagnetic brake incorporated in a motor vehicle of the electromagnetic coupling device has a structure in which a lining is provided in an opening of a coil accommodating groove of a field core, and an armature is frictionally engaged with the lining. With such a structure, the torsion force acts on the lining every time braking is repeated, so that the lining peels off from the field core with a decrease in the adhesive force due to the adhesive.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an exciting device for an electromagnetic coupling device capable of firmly holding a coil bobbin in a coil receiving groove of a field core. Another object of the present invention is to prevent the lining bonded to the opening of the coil accommodating groove of the field core from peeling off in such an exciting device.

[0007]

In order to achieve the above object, an exciting device for an electromagnetic coupling device according to the present invention comprises a column-shaped bottom (4a) and a bottom (4a).
a) a reel side part (4b) extending radially outward from both ends of the reel; and a projecting part (4c) integrally formed on a side surface of the reel bottom (4a). A coil bobbin (4) made of a synthetic resin material in which an exciting coil (5) is wound in multiple turns in a coil holding groove (4d) defined by a winding frame bottom portion (4a) and a winding frame side portion (4b); An annular coil accommodating groove (3a) accommodating the coil bobbin (4), and an outer peripheral wall (3b, 3d) or an outer peripheral wall radially outside the outer peripheral wall of the coil accommodating groove (3a). An opening of the coil receiving groove (3a) in which at least one of the inner peripheral walls (3c, 3e) is radially inner than the peripheral wall;
a field core (3) provided with a first step portion (3f) formed at a portion which transitions from the peripheral wall of (a) to the peripheral wall (3b, 3c) of the opening, and the first step portion ( 3
f) The holding plate (6), which is press-fitted into the opening of the coil receiving groove (3a) until it comes into contact with the holding plate (6) and is deformed by pressing the protrusion (4c) of the coil bobbin (4). It is characterized by having been provided.

According to a second aspect of the present invention, there is provided an exciting device for an electromagnetic coupling device according to the first aspect, wherein a lining (7) is provided in an opening of the coil receiving groove (3a). ) Is fitted and fixed to the holding plate (6), and the lining (7) projects outward from an opening of the coil receiving groove (3a).

According to a third aspect of the present invention, there is provided the exciting device of the electromagnetic coupling device according to the second aspect, wherein the holding portion is provided in an opening of the coil receiving groove (3a). The peripheral wall (3b, 3) into which the plate (6) is press-fitted
c) the peripheral wall (3) into which the lining (7) is fitted
d, 3e) is provided with a second step portion (3g) at a position where the side surface of the holding plate (6) slightly projects from the second step portion (3g) toward the opening side. Features.

According to a fourth aspect of the present invention, there is provided the exciting device of the electromagnetic coupling device according to the third aspect, wherein the holding plate (6) and the peripheral surface of the lining (7) are provided. A flat surface (16a) is formed on the flat surface (16a), and the flat surface (16a) is fitted to a flat surface (15b) formed on a peripheral surface of an opening of the coil housing groove (15a). I do.

[0011]

1 and 2 show an electromagnetic brake provided with an exciting device according to an embodiment of the present invention. FIG. 1 is a sectional view of an electromagnetic brake, and FIG. 2 is an enlarged view of a main part of FIG. The electromagnetic brake shown in these drawings is a micro electromagnetic brake having a static friction torque of about 5 to 10 kgfcm, and includes an exciting device 1 fixed to a motor housing (not shown), an armature assembly 2 mounted on a rotating shaft of the motor, and Are arranged on the same axis.

The exciting device 1 includes a field core 3 having a coil housing groove 3a opened in the axial direction, a coil bobbin 4 housed in the coil housing groove 3a, and an exciting coil wound around the coil bobbin 4 in multiple turns. Coil 5 and holding plate 6 (non-magnetic plate) press-fitted into the opening of coil receiving groove 3a
And a lining 7 fitted in the opening of the coil receiving groove 3 a and fixed to the holding plate 6, and electrically connected to the winding end of the exciting coil 5.
And a mounting plate 10 welded to the outside of the bottom of the field core 3.

The coil receiving groove 3 of the field core 3
a first outer peripheral wall 3b whose dimension from the center is larger than the outer peripheral wall of the coil housing groove 3a;
a first inner peripheral wall 3 whose dimension from the center is smaller than the inner peripheral wall of a
c, a second outer peripheral wall 3d having a larger dimension from the center than the first outer peripheral wall 3b, and a second inner peripheral wall 3e having a smaller dimension from the center than the first inner peripheral wall 3c are formed. . A portion that transitions from the outer peripheral wall of the coil receiving groove 3a to the first outer peripheral wall 3b and a portion that transitions from the inner peripheral wall of the coil receiving groove 3a to the first inner peripheral wall 3c are on the same flat plane. A portion provided as one stepped portion 3f and transitioning from the first outer peripheral wall 3b to the second outer peripheral wall 3d and a portion transitioning from the first inner peripheral wall 3c to the second inner peripheral wall 3e are on the same plane. Is provided as a flat second step portion 3g.

The coil bobbin 4 is formed of a synthetic resin material, and has a cylindrical bottom 4a and a disk-shaped side 4b extending radially outward from both ends of the bottom 4a. And a protrusion 4c integrally formed on the side surface of one end of the bobbin bottom 4a. Further, a coil holding portion 4d composed of an annular groove opened outward in the radial direction is defined by the bobbin bottom portion 4a and the bobbin side portion 4b. The protruding portion 4c is formed on the side surface of the bobbin bottom 4a at a position dividing the circumferential direction into four equal parts, but may be an annular protruding portion. Further, the bobbin bottom 4a may be formed in a prismatic shape.

Next, the exciting device 1 having such a structure will be described.
Will be described. First, the exciting coil 5 is wound in multiple turns on the coil holding portion 4d of the coil bobbin 4, and the winding end is electrically connected to the lead wire 9, and
An insulating tape is wound around the outer peripheral surface of the winding body of the exciting coil 5. In the coil assembly thus assembled, the coil bobbin 4 is fitted into the coil accommodating groove 3a of the field core 3 while pulling the lead wire 9 out of the through hole of the rubber bush 8. After the fitting, the holding plate 6 is press-fitted into the opening of the coil receiving groove 3a of the field core 3 by press working until the outer peripheral edge and the inner peripheral edge abut on the first step portion 3f. By this press-fitting, the projecting portion 4 of the coil bobbin 4 is formed.
c is deformed by being pressed by the holding plate 6.

After the press-fitting of the holding plate 6, an adhesive is applied to the side surface of the holding plate 6 slightly projecting toward the opening side from the second step portion 3g, and then the outside is applied to the second step portion 3g. Until the peripheral edge and the inner peripheral edge approach each other, the lining 7 is fitted into the opening of the coil receiving groove 3a of the field core 3, and the lining 7 is fixed to the holding plate 6. In the excitation device 1 thus assembled, the coil bobbin 4 is firmly held in the coil receiving groove 3a of the field core 3. Further, the lining 7 slightly projects from the opening of the field core 3.

Next, the armature assembly 2 will be described. The armature assembly 2 is disposed on the same axis as the excitation device 1, and has a hub 11 mounted on a rotating shaft of a motor (not shown), and an annular member fixed to the flange portion of the hub 11 by rivets via a spacer. Leaf spring 12 and an annular armature 13 to which this leaf spring 12 is fixed with rivets
Is provided. An axial air gap is formed between the armature 13 and the field core 3.

An electromagnetic brake having such a structure is as follows.
The armature 13 is magnetically attracted to the field core 3 by a magnetic flux generated by energizing the exciting coil 5. Further, the armature 13 and the lining 7 are frictionally engaged, and the rotating shaft of the motor that is rotating by inertia is braked and stopped.

In the above description, the exciter 1
The first stepped portion 3f is provided on both the outer peripheral wall and the inner peripheral wall of the opening-side wall surface of the coil housing groove 3a of the field core 3.
And the second step 3g are formed, but a structure in which the first step 3f and the second step 3g are formed only on one of the peripheral walls may be employed. That is, the outer peripheral surfaces of the holding plate 6 and the lining 7 or the inner peripheral surfaces thereof may be formed to have the same dimensions. In the side surface of the bobbin bottom 4a of the coil bobbin 4, the protruding portion 4c is provided on the surface facing the holding plate 6, but the protruding portion 4c is provided on the surface facing the bottom of the coil accommodating groove 3a. You may.

Next, another embodiment of the present invention will be described. FIG. 3 is a plan view of the excitation device, and FIG.
It is a top view of a lining. The excitation device 14 shown in these drawings is provided with a coil receiving groove 15a of the field core 15.
Of the peripheral wall, a flat surface 15 parallel to the opening end of the inner peripheral wall surface.
b is formed. A parallel flat surface 16a fitted to the flat surface 15b is formed on the inner peripheral surface of the lining 16 fixed to a holding plate (not shown). The inner peripheral surface of the holding plate (not shown) is provided with a parallel flat surface, and is formed on the inner peripheral surface having the same shape and the same dimensions as the lining 16.

That is, this exciting device 14 is
6 and the inner peripheral surface of the holding plate are engaged with the field core 15 in the circumferential direction, and the lining 16 and the outer peripheral surface of the holding plate are formed in the same manner as the excitation device 1 described above. This is a structure in which the core 15 is fitted into the opening of the coil receiving groove 15a. Reference numeral 17 in FIG. 3 denotes a mounting plate welded to the field core 15.

The electromagnetic brake provided with such an exciting device 14 brakes the rotating shaft of the motor on which the armature assembly is mounted, similarly to the above-described electromagnetic brake. In the embodiment, a flat surface is formed on the inner peripheral surface of the lining 16 or the holding plate. However, a structure in which a flat surface is formed on the outer peripheral surface thereof may be used. Also,
The peripheral surfaces of the lining 16 and the holding plate may be formed in a polygonal shape.

Further, the excitation device of the electromagnetic brake has been described as the excitation device of the electromagnetic coupling device of the present invention, but the present invention can be applied to an excitation device such as a coil-rotating electromagnetic clutch.

[0024]

As described in detail above, the exciting device of the electromagnetic coupling device according to the present invention is provided with a projection integrally formed on the side surface of the bottom of the bobbin bobbin of the coil bobbin. The coil bobbin is sandwiched between the bottom of the coil receiving groove and the holding plate, and is firmly held in the coil receiving groove because the holding plate is press-fitted into the opening of the groove so as to be pressed and deformed. You. In addition, since the projecting portion of the coil bobbin is not deformed when fitted into the coil housing groove, the coil bobbin can be securely held in the coil housing groove. In addition, since the projecting portion is provided on the side surface of the bottom of the bobbin of the coil bobbin, the pressing force of the holding plate is absorbed by the bottom of the bobbin, and the breakage of the exciting coil wound in the coil holding groove and the damage of the bobbin side are prevented. Can be prevented.

Further, since the second step portion is provided in the opening of the coil housing groove, the press-fit dimension of the holding plate by press working is reduced, and the press-fitting operation can be simplified.

Furthermore, a flat surface is formed on the peripheral surface of the lining or the holding plate, and this flat surface is fitted to the flat surface formed on the peripheral surface of the opening of the field core. Is applied to the field core via the flat surface, so that peeling of the lining can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electromagnetic brake shown as an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a plan view of an exciting device shown as another embodiment.

FIG. 4 is a plan view of the lining.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Exciting device 3 ... Field core 4 ... Coil bobbin 5 ... Exciting coil 6 ... Holding plate 7 ... Lining 14 ... Exciting device 15 ... Field core 16 ... Lining

Claims (4)

[Claims] 1. A pillar-shaped bottom of a bobbin, a bobbin side portion individually extending radially outward from both ends of the bobbin bottom, and a protrusion integrally formed on a side surface of the bobbin bottom. A coil bobbin made of a synthetic resin material in which an exciting coil is wound in multiple turns in a coil holding groove defined by a bottom portion and a side portion of the winding frame, and an annular coil receiving groove in which the coil bobbin is stored. And an opening of the coil receiving groove in which at least one of an outer peripheral wall radially outside the outer peripheral wall of the coil receiving groove or an inner peripheral wall radially inside the inner peripheral wall of the coil receiving groove is formed. And a field core provided with a first step portion formed at a portion that transitions from the peripheral wall of the coil receiving groove to the peripheral wall of the opening portion, and the coil housing until contacting the first step portion. Press fit into groove opening An exciter for an electromagnetic coupling device, comprising: a holding plate that is deformed by pressing a projecting portion of the coil bobbin. 2. An exciting device for an electromagnetic coupling device according to claim 1, wherein a lining is fitted into an opening of said coil housing groove and is fixed to said holding plate.
The exciting device of the electromagnetic coupling device, wherein the lining projects outward from an opening of the coil housing groove. 3. The exciting device for an electromagnetic coupling device according to claim 2, wherein the opening of the coil receiving groove is formed from a peripheral wall where the holding plate is press-fitted to a peripheral wall where the lining is fitted. A second step portion is provided at a portion to be shifted,
An exciter for an electromagnetic coupling device, wherein a side surface of the holding plate slightly protrudes toward the opening side from the second step portion. 4. The exciting device for an electromagnetic coupling device according to claim 3, wherein a flat surface is formed on a peripheral surface of the holding plate and the lining, and the flat surface is formed around an opening of the coil receiving groove. An excitation device for an electromagnetic coupling device, wherein the excitation device is fitted on a flat surface formed on the surface.