JPH0337425A - Exciting device of electromagnetic connecting device - Google Patents

Abstract

PURPOSE:To prevent the poor insulation of an exciting coil without conducting any troublesome work by dividing the exciting coil into two members or more, enclosing them with a hollow ring coil bobbin made of resin material, and fusing the divided fitting surfaces of the bobbin to each other. CONSTITUTION:In the assembling of an exciting device 16, as a coil bobbin 17 is divided into an inner coil bobbin 18 and an outer coil bobbin 19 in the outside of a yoke 3, an exciting coil 4 having self-fusing property is multi-wound on the bobbin 18. Then, the bobbin 19 is bonded to the bobbin 18 after winding, and at the time of bonding the both bobbins 18, 19, the engaging channel 18c of the bobbin 18 is engaged with the locking piece 19d of the bobbin 19 to temporarily fix the bobbin 17. Consequently, the coil 4 is enclosed with the coil bobbin 17 formed of the bobbin 18 and the bobbin 19. The whole circumferences of the fitting surfaces 20, 21 of the bobbins 18, 19 are fused to each other by ultrasonic welding to finally fix the bobbin 17, and a lead wire 15 connected to the winding start and winding end of the coil 4 is inserted into a bush 19c and drawn to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an excitation device that magnetically attracts an armature in an electromagnetic coupling device such as an electromagnetic flange or an electromagnetic brake.

(Prior Art) In electromagnetic coupling devices such as electromagnetic flanges and electromagnetic brakes, an excitation device for magnetically adsorbing armadure has conventionally been constructed as disclosed in, for example, Japanese Utility Model Publication No. 60-39540.

This excitation device is housed in an annular groove of a yoke via a resin insulator, and is composed of a resin coil bobbin and an excitation coil wound around the coil bobbin. That is,
The coil bobbin is formed into an annular shape with a U-shaped cross section, consisting of a cylindrical part and flange parts at both ends, and an excitation coil is wound in multiple strips around the coil bobbin by a winding machine. An insulating tube is placed over the soldering portions of the beginning and end of the second winding and the Leet wire. In addition, the yoke that houses the coil bobbin around which this excitation coil is wound is pressed into an annular shape, and its cross-sectional shape is made up of the bottom plate, outer flange, and inner flange so that an annular groove is formed. It is formed into a letter shape. The outer flange and the inner flange have inner circumferential surfaces tapered so as to widen toward the opening side, and a recess is formed in the inner circumferential surfaces. Further, a convex portion protruding into the annular hole is formed on the annular bottom plate, and a rubber bunoche is fitted into the hole provided in the bottom plate.

With this configuration, the coil bobbin around which the excitation coil is wound is loosely fitted into the annular groove of the yoke, and the excitation coil glued wire is inserted into the hole of the rubber cover and taken out to the outside. The excitation coil is insulated and fixed within the annular groove of the yoke by pouring an insulating material around the coil bobbin and hardening it. In this case, since the convex part is formed on the bottom plate of the annular groove and the coil bobbin is lifted from the bottom plate, the resin flows into the bottom plate side of the coil bobbin, and also because of the concave part formed on the inner peripheral surface of the annular groove. , since the resin freezes into the concave part of the bowl, the resin does not come loose.

[Problem to be solved by the invention]

However, in such conventional excitation devices, in order to prevent moisture from entering the excitation coil and causing poor insulation, a resin insulator is placed between the annular groove of the yoke and the coil bobbin as described above. Since injection is required, there are problems in that the work requires a long time, reduces productivity, and requires a large amount of labor.

The present invention has been made in view of the above points, and an object of the present invention is to provide an excitation device for an electromagnetic coupling device that makes it possible to prevent insulation defects without injecting resin and improve productivity. The purpose is

(Means for Solving the Problems) In order to achieve such an object, the present invention includes an excitation coil made of a multi-filed coil, which is divided into at least two members and formed into a hollow annular shape. It was surrounded by a coil bobbin made of a resin material, and the split mating surfaces of the coil bobbin were welded by ultrasonic welding.

[Function] After storing the M[coil in one of the disassembled coil bobbins and taking out the Riet wire outside, joining the other coil bobbin to this one coil bobbin, the entire circumference of the mating surface of both coil bobbins is ultrasonically welded. When welded, the excitation coil is surrounded by the coil bobbin, so press the combined coil bobbin into the annular groove of the yoke while taking out the lead wire to complete the assembly of the excitation coil, and begin the resin injection work. The excitation device is firmly held in the annular groove of the yoke in a short time without causing any insulation defects.

〔Example〕

1 and 2 show an example in which the excitation device of the electromagnetic coupling device according to the present invention is applied to an electromagnetic clutch of an automobile pressurizer, and FIG. 1 is a longitudinal cross-sectional view of the electromagnetic clutch, and FIG. 1 is a longitudinal cross-sectional view of the excitation device shown at a position different in phase from that in the circumferential direction. In the figure, an electromagnetic clutch 1 includes a yoke 3 fixed to a housing of an automobile compressor (not shown) through a plate 2. In the annular groove 3a of the yoke 3, an excitation coil 4 is wound around a coil bobbin which will be described later. In addition, the cylindrical portion 5 of the housing
! A rotor 6 having an annular groove 6a loosely capped by the yoke 3 from the opening side is supported via a bearing 7 so as to be rotatable and axially restricted from moving. On the other hand, a hub 9 formed in a cylindrical shape with a flange is rotatably attached to the tip of a drive shaft 8 provided in the compressor and passing through the cylindrical portion 5, and is fixed to the drive shaft 8 with bolts 10. This hub 9
An armature 12 formed entirely in the shape of a ring plate is riveted to the leaf spring 11, with the friction surface 12a facing the friction surface 6b of the rotor 6.

Armature 12 is an annular gap! It is formed of an outer ring member 12c and an inner ring member 12d which are arranged concentrically with a gap 2b in between, and a stopper rubber 13 is inserted between the inner ring member 12d and f4f9a of the hub 9. It's being held in place.

That is, the armature 12 is connected to the hub 9 by the leaf spring 11.
A gap is formed between the rotor 6 and the armature 12, which is indicated by the symbol G in the figure. 14
is a pulley that is fitted and welded to the outer periphery of the rotor 6, and is held connected to a pulley provided on the crankshaft of an automobile engine, and is configured to be rotated by being driven from the engine side. . 15 is a lead wire connected to the excitation coil 4, and the excitation coil 4 is connected to an external circuit via this lead wire 15. When the excitation coil 4 is energized by ON/OFF control of this electric circuit, The armature 12 is attracted to the rotor 6 by the generated magnetic flux, and the rotation of the rotor 6 is transmitted to the drive shaft 8 via the armature 12, the leaf spring 11, and the hub 9.

Next, the excitation device, which is the main part of the present invention, will be explained. The yoke 3 constituting the excitation device 16 shown in FIG. 2 is pressed into an annular shape, and its cross-sectional shape is
The annular bottom plate 3b, the outer flange 3c, and the inner flange 3d are formed in a U-shape so that a is formed. The outer flange 3c and the inner flange 3d that form the annular groove 3a have tapered inner peripheral surfaces that widen toward the opening end, and a hole 3e is bored at one location on the bottom plate 3b. has been done. An annular groove 3 of such a yoke 3
Inside a, the excitation coil 4 is wound around a coil hobbin 17 and housed. The coil bobbin 17 is divided into an inner coil bobbin 18 and an outer coil bobbin 19 made of a resin material.
A cylindrical portion 18a whose inner circumferential surface is in contact with the outer circumferential surface of the inner flange 3d of the yoke 3 having a taper, and an annular flange portion 18b positioned so as to close the open end of the annular groove 3a form an annular shape having an L-shaped cross section. is formed. Further, the outer coil bobbin 19 is connected to the tapered outer flange 3 of the yoke 3.
c A cylindrical portion 19a whose outer circumferential surface is in contact with the inner circumferential surface, and an annular flange portion 1 located so as to be in contact with the bottom surface of the annular groove 3a.
9b, and a bushing 19c is integrally formed at one location of the flange portion 19b to fit into the hole 3e and allow the lead wire 15 to pass therethrough. Before being inserted into the annular groove 3a of the yoke 3, the inner coil bobbin 18 has many excitation coils 4 having self-bonding properties, such as a double-layer enameled wire with a self-bonding layer coated on an insulating layer. The outer coil bobbin 19 is joined to the inner coil bobbin 18 after winding, and as a result, the excitation coil 4 is surrounded by the coil bobbin 17 consisting of the inner coil bobbin 18 and the outer coil bobbin 19. . When joining both coil bobbins 18 and 19, the engagement groove 1 provided on the inner coil bobbin 18 is
8c and a locking piece 19d provided on the outer coil bobbin 19 are engaged to temporarily fix the coil bobbin 17, and then the entire circumference of the mating surface 20.21 of both coil hobbins 18.19 is welded by ultrasonic welding. The coil bobbin 17 is permanently fixed. Also, lead wire 15 is Ginoshu +9c
It is inserted into the body and pulled out to the outside. The coil bobbin 17 assembled externally in this way is press-fitted into the annular groove 3a of the yoke 3, and by caulking the caulking pieces 22 and 23 provided at the open end of the annular groove 3a, the coil bobbin 17 is pressed into the annular groove 3a.
It is fixed and restricted from coming out.

The operation of the electromagnetic clutch configured as above will be explained. Since the excitation coil 4 is connected to an external electric circuit via a lead wire 15, when the excitation coil 4 is energized by ON-OFF control of this electric circuit, the armature 12 is moved by the spring force of the leaf spring 11 due to the generated magnetic flux. The rotation of the rotor 6, which is magnetically attracted to the rotor 6 and rotates together with a pulley I4 driven from the engine side of the automobile, is transmitted to the drive shaft 8, thereby driving the compressor.

When the excitation coil 4 is de-energized from this state, the magnetic attraction of the armature 12 is released, so the armature 1
2 is separated from the rotor 6 by the spring force of the leaf spring 11, and a gap G is formed between the friction surfaces 12a and 6b, and the pulley 14
Rotation transmission from the compressor to the drive shaft 8 is cut off, and the compressor stops.

Next, the assembly operation of the excitation device 16 will be explained. On the outside of the yoke 3, the coil bobbin 17 is connected to the inner coil bobbin 18.
Since the coil bobbin 17 is divided into a coil bobbin 17 and an outer coil bobbin 17, first, the excitation coil 4 having self-bonding properties is wound in multiple threads around the inner coil bobbin 18.

The outer coil bobbin 19 is attached to the inner coil bobbin 18 after winding.
However, when joining both coil bobbins 18 and 19, the engagement groove 18c of the inner coil bobbin 18 and the locking piece 19d of the outer coil bobbin 19 are engaged to temporarily fix the coil bobbin 17, and as a result, the excitation coil 4 is surrounded by a coil bobbin 17 consisting of an inner coil bobbin 18 and an outer coil bobbin 19. Next, both coil bobbins 18
The entire circumference of the mating surfaces 20' and 21 of No. 19 is welded by ultrasonic welding to permanently fix the coil hobbin I. At this time, the tote wire 15 connected to the winding start and winding end of the excitation coil 4 is pushed into the ginosh 19C and pulled out to the outside. The coil bobbin 17 assembled externally in this way is press-fitted into the annular groove 38 of the three-ring groove 3. , I and the outer peripheral surface of the coil bobbin 17 are tapered, so the coil bobbin 17
is firmly fixed. After press-fitting and fixing, the annular groove 3a is opened ``j''
By caulking the caulking pieces 22 and 23 provided at the ends,
The coil bobbin 17 is fixed while being prevented from coming off from the annular groove 3a. The excitation coil 4 is a coil bobbin 1 made of resin material.
Since it is surrounded by the yoke 7, it is completely insulated from the yoke 3, and moisture does not enter from the outside.

3(a) and 3(b) are longitudinal sectional views of a coil bobbin showing another embodiment of the present invention, FIG. 3(a) is a longitudinal sectional view of an outer coil bobbin, and FIG. 3(b) is a longitudinal sectional view of an outer coil bobbin. FIG. 3 is a longitudinal cross-sectional view of the inner coil bobbin. That is, in this embodiment, the coil hobbin is divided into an inner coil bobbin 24 and an outer coil hobbin 25, and the inner coil bobbin 24 is integrally formed into a ring shape with a U-shaped cross section by a bottom plate 24a, an outer flange 24b, and an inner flange 24c. A hole 24d into which the lead wire 15 is inserted is integrally formed at one location of the annular bottom plate 24a. Further, the outer coil bobbin 25 is formed in the shape of a ring plate, and is configured to close the open end of the inner coil hobbin 24. Note that the volume of the fitting portion 25a of the outer coil bobbin 25 is the same as that of the fitting portion 24d of the inner coil bobbin 24.
It is formed smaller than the volume of.

Due to this configuration, the wound excitation coil d is housed in the inner coil bobbin 24,
After the lead wire 15 is inserted into the coil bobbin 2/1d and pulled out to the outside, the open end of the inner coil bobbin 24 is closed with the outer coil bobbin 25, and both coil bobbins 24,
The mating surfaces of No. 25 are welded by ultrasonic welding. In this case, by forming the volume of the fitting part 25a of the outer coil hobbin 25 to be smaller than the volume of the fitting part 24d of the inner coil bobbin 24, during welding after fitting these parts,
No burrs protrude from the end face of the coil hobbin.

After being assembled in this way, the crimping piece 2223 is stored in the annular groove 3a of the yoke 3 and is crimped.
This is the same as Example I.

In each of the above-mentioned embodiments, an example was shown in which the bununyu 19c24d was formed integrally with the coil bobbin, but it may be made separate from the coil bobbin and made into a rubber sole. The bowed portion of the lead wire 15 from the coil bobbin can also be welded in the same manner.

In addition, in each of the above embodiments, the excitation coil was made of a self-bonding wire, but the inner coil
An excitation coil made of a wound general magnet wire may be fixed to 1B and 24 by wrapping tape.

Furthermore, in each of the above embodiments, an example was shown in which the present invention 191 was applied to an electromagnetic clutch, but it can also be similarly applied to an electromagnetic brain drive, and similar effects can be obtained.

C. Effects of the Invention] As is clear from the explanation in 2 below, according to the present invention, in the excitation device for an electromagnetic coupling device, the excitation coil consisting of a coil wound in multiple strips is divided into at least two members. Surrounded by a hollow ring-shaped resin coil bobbin,
By welding the split mating surfaces of this coil bobbin using ultrasonic welding, poor insulation of the excitation coil can be prevented without the troublesome work of injecting a resin insulator into the yoke and hardening it. Because you can
Workability is improved, automation of the process becomes possible, and productivity of the excitation device is improved.

[Brief explanation of drawings]

1 to 3 show an example in which the excitation device of the electromagnetic coupling device according to the present invention is applied to an electromagnetic clutch. FIG. 1 is a longitudinal sectional view of the electromagnetic clutch, and FIG. Vertical cross-sectional view of the excitation device shown at a different phase position, Figure 3 (a)
, '(b) is a longitudinal sectional view of a coil bobbin showing another embodiment of the present invention, FIG. 3(a) is a longitudinal sectional view of the outer coil bobbin, and FIG. 3(b) is a longitudinal sectional view of the inner coil bobbin. It is a diagram. 3... Yoke, 3a... Annular vortex, 4...
...Encouraging n coil, I6...Excitation device, 17...
・Coil hobbin, 18.24... ・Inner coil bobbin, 19.25... Outer coil hobbin, 20.2
1...Mating surface.

Claims (1)

[Claims] An excitation coil consisting of a coil wound in multiple strips is surrounded by a coil bobbin made of a resin material that is divided into at least two parts and formed into a hollow annular shape, and the mating surfaces of the divided parts of the coil bobbin are welded by ultrasonic welding. An excitation device for an electromagnetic coupling device, characterized in that: