JPH10176726A - Electromagnetic coupling device - Google Patents

Abstract

(57) [Problem] To facilitate connection work with an exciting coil, a power supply side lead wire and an electric component. Also, the size of the storage section is reduced. SOLUTION: A winding start end 4a and a winding end end 4b of an exciting coil 4 are drawn out into a storage portion 22 of a bobbin main body 20a, and a diode 24 is stored therein, and these are electrically connected by two terminals 27A and 27B. Connect to The winding start end 4a and the winding end 4b
, The lead engagement grooves 30a, 30b into which the leads 24a, 24b of the diode 24 are engaged, and the terminal engagement into which the terminals 27A, 27B are press-fitted. Grooves 32a and 32b are formed. Each of the terminals 27A and 27B has a winding start end 4a, a winding end end 4b, and a groove into which the leads 24a and 24b are inserted. The power supply side lead wires 26 are connected to the terminals 27A and 27B, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic coupling device such as an electromagnetic clutch or an electromagnetic brake, and more particularly, to preventing breakage of an electric circuit due to a surge voltage, and cutting accident of a V-belt when a rotation member on an output side is locked. The present invention relates to an electromagnetic coupling device incorporating an electric component for performing the connection.

[0002]

2. Description of the Related Art Among conventional electromagnetic coupling devices, an electromagnetic clutch mounted on, for example, a compressor for an automobile or the like has a single type of yoke incorporating an exciting coil because the length of a lead wire varies depending on a vehicle type. It cannot be shared as various kinds of automotive parts, which is uneconomical in terms of design and inventory management. Therefore, various electromagnetic coupling devices in which the excitation coil and the power supply side lead wire are connected outside the yoke have been conventionally proposed (JP-A-63-12108, JP-A-4-12).
No. 5322).

In this type of electromagnetic coupling device,
At the moment when the power to the excitation coil is cut off, a large surge voltage is generated at both ends of the excitation coil, which may damage the contacts of the switch or cause a malfunction, so connect a diode in parallel with the excitation coil. (Shinkaisho 60-12
732, JP-A-4-125322).

In the electromagnetic coupling device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 4-125322 (hereinafter referred to as Prior Art 1), a terminal housing is integrally provided on a coil bobbin for housing an exciting coil, and the terminal housing is provided with an excitation. The winding start and end ends of the coil are pulled out, and a diode is connected in parallel to the exciting coil. The winding start and winding end portions of the exciting coil are arranged in the terminal storage portion.
The fittings are press-fitted into the slits of the two fittings, respectively, and are electrically connected to these fittings by damaging the insulating coating. Also, the excitation coil and the diode are connected in parallel by pressing the bent pieces of the support fitting into the mounting fitting and electrically connecting the fittings.

Further, in this type of electromagnetic coupling device, when the output side rotating member stops rotating for some reason, the rotor and the armature slip and generate heat, and the V belt stretched over the rotor is cut off. Therefore, it is necessary to detect heat generation at an early stage, cut off the power supply to the exciting coil, and separate the rotor from the armature. Therefore, for example, JP-A-56-138529 (hereinafter referred to as Prior Invention 2) and JP-A-57-5102
As disclosed in Japanese Unexamined Patent Publication No. 5 (hereinafter referred to as Prior Invention 3) and the like, an electromagnetic coupling device using a thermal fuse has been proposed. That is, in the electromagnetic clutch disclosed in Prior Invention 2, a notch is provided on the outer peripheral edge of one flange of the coil bobbin around which the exciting coil is wound, and winding start and end ends of the exciting coil are drawn out from the notch. ing. A notch is also provided at the outer end of the other flange, and an intermediate portion of the exciting coil is drawn out from the notch to form a bent portion, and the bent portion is cut into a terminal portion for fuse connection. The temperature fuses are connected in series to the excitation coil by connecting the respective terminals of the temperature fuses by crimp terminals. Then, the thermal fuse is fixed by a hook provided on the other flange.

The electromagnetic clutch disclosed in Prior Invention 3 is
A fuse holding portion for holding a thermal fuse is provided on an outer surface of a coil bobbin accommodating an exciting coil, and this coil bobbin is molded with a thermal fuse with a synthetic resin and insulated from the outside. In this way, if the thermal fuse is connected to the excitation coil, the thermal fuse is melted by the heat generated by the slip between the rotor and the armature,
The energization to the exciting coil can be cut off, and a V belt cut accident or the like can be prevented.

[0007]

In the electromagnetic coupling device according to the first aspect of the present invention, as described above, the winding start and end ends of the exciting coil are inserted into the slits of the respective mounting brackets to be electrically connected. Each lead of the diode is connected in advance to a power supply side lead wire and a ground wire from an exciting coil by a support fitting, and a bent portion of the support fitting is press-fitted into the mounting fitting to electrically connect the supporting fitting and the mounting fitting to each other. It adopts a structure to connect to each other. Therefore, two types of metal fittings, two each for the support metal and the mounting metal, are required, and the total number of parts is large, the number of parts is large, the connection work of the excitation coil, the lead wire and the diode is troublesome, and the terminal housing is large. There was a problem of becoming.

[0008] The electromagnetic clutch described in Prior Invention 2 is
Since the excitation coil and the lead of the thermal fuse are connected in advance by crimp terminals, and the fuse is sandwiched and fixed by a hook, there is a problem that the connecting work between the thermal fuse and the excitation coil is troublesome. . In the electromagnetic clutch shown in Prior Invention 3, since the coil bobbin is molded with a synthetic resin together with a thermal fuse, it is necessary to inject and solidify the melted mold resin into the coil receiving groove of the yoke accommodating the coil bobbin. For this reason, there is a problem that it takes a long time to perform a molding operation, thereby lowering productivity.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. It is an object of the present invention to provide a low-cost, low-cost terminal connecting work to an exciting coil, a power supply side lead wire, and an electric component. An object of the present invention is to provide an electromagnetic coupling device that can be easily performed and that can reduce the size of a storage section.

[0010]

An electromagnetic coupling device according to the present invention comprises: an exciting coil; a bobbin main body in which the exciting coil is inserted; a first storage unit provided integrally with the bobbin main body; A winding start / end end of the exciting coil drawn out from an inner bottom surface of the first storage portion, a surge voltage absorbing component stored in the first storage portion, and a first storage portion stored in the first storage portion; A pair of first terminals to which the winding start and end ends are connected to the leads of the surge voltage absorbing component, and to which power supply side lead wires are respectively connected, and a terminal cover fixed to the first storage portion And a coil cover covered by the exciting coil projecting from the bobbin main body,
A second storage unit provided integrally with the coil cover,
A cut end of the exciting coil pulled out from the inner bottom surface of the second storage part, a heat sensing component stored in the second storage part, and a cut end stored in the second storage part; A pair of second terminals for connecting a portion and a lead of the heat sensing component, a fuse cover fixed to the second storage portion,
A through-hole into which the first storage portion is inserted is formed in a bottom portion, and the bobbin main body and a yoke into which the coil cover is inserted are provided in an annular groove.

Further, in the above-described electromagnetic coupling device, the first
Are formed in a U-shape, and two opposing side plates are provided with grooves into which the winding start and end ends of the exciting coil and the leads of the surge voltage absorbing component are respectively engaged.
A coil extraction hole from which the winding start and end ends of the excitation coil are drawn out, and a coil engagement groove into which the winding start and end ends of the excitation coil are engaged. And a lead engaging groove into which the lead of the surge voltage absorbing component is engaged. On the inner side surface of the side plate of the first storage portion, each side plate of the first terminal is provided. It is characterized in that a terminal engaging groove is provided.

Still further, in the above-described electromagnetic coupling device, the second terminal is formed in a U-shape, and a cut end of the exciting coil and a lead of the heat sensing component are respectively provided on two opposing side plates. A groove is provided to be engaged, and a coil extraction hole through which the cut end of the exciting coil is drawn out is provided on an inner bottom surface of the second storage portion, and a coil engaging hole into which the cut end of the exciting coil is engaged. And a lead engaging groove into which the lead of the heat sensing component is engaged.
A terminal engagement groove into which each side plate of the second terminal is engaged is provided on an inner side surface of the side plate of the storage section.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. 1 to 19 show an example in which the electromagnetic coupling device according to the present invention is applied to an electromagnetic clutch of an automotive refrigerant compressor. FIG. 1 is a sectional view of an electromagnetic clutch,
2 is a front view of the yoke assembly, FIG. 3 is a rear view of the yoke assembly, FIG. 4 is an enlarged view of a main part of FIG. 3, and a plan view of the storage section with a terminal cover removed, and FIG. AA in FIG.
6, FIG. 6 is a plan view of a storage portion of the bobbin main body, FIG. 7 is a sectional view taken along line BB of FIG. 6, FIG. 8 is a sectional view taken along line CC of FIG.
9 is a sectional view taken along line DD of FIG. 6, FIG. 10 is a view taken in the direction of arrow E in FIG. 9, and FIG. 11 is an enlarged view of a main part of FIG. FIG. 12, FIG. 12 is a cross-sectional view taken along line FF of FIG. 11, FIG. 13 is a plan view of a storage portion of the coil cover, FIG. 14 is a cross-sectional view taken along line GG of FIG.
13 is a sectional view taken along line HH of FIG. 13, FIG. 16 is a sectional view taken along line II of FIG. 13, FIG. 17 is a sectional view taken along line JJ of FIG.
(A), (b) is a bottom view and a side view of the terminal, FIG.
(A), (b) is the bottom view and side view of a terminal.

In FIG. 1, a housing 1 of a refrigerant compressor is shown.
A yoke 2 having a U-shaped cross section is fixed via a support plate 3 to the outer periphery of the nose portion 1a. The support plate 3 is positioned with respect to the housing 1 by the concave portion 1d and the convex portion 3a, and the axial movement of the support plate 3 is regulated by the retaining ring 23. In addition, a coil bobbin 20 described later for accommodating the excitation coil 4 formed of a self-fusing wire is fitted into the annular groove 2 a of the yoke 2. A ball bearing 5 is fitted into the nose 1 a of the housing 1, and the axial movement is restricted by the snap ring 6 and the step 1 b of the housing 1. Outer ring 5a of this ball bearing 5
An annular rotor 7 having an annular groove 7a into which the yoke 2 is inserted is fitted by press-fitting or the like, and has a stepped portion 7b and a plurality of caulking pieces 7c. The movement in the direction is regulated. A plurality of V-shaped grooves 7d are formed on the outer periphery of the rotor 7, and a V-belt (not shown) stretched between the V-shaped grooves 7d and a driving source such as an automobile engine. The rotation of the drive source is transmitted to the rotor 7.

On the other hand, a rotating shaft 8 is provided through a center hole 1c of the housing 1. The rotating shaft 8 is rotatably supported by a bearing (not shown) on the housing 1 and protrudes outside from the nose portion 1a. An armature assembly 9 serving as a rotating member on the output side is attached to the protruding end. .

The armature assembly 9 includes an armature hub 10, a stopper plate 11, an armature 12, and the like. Armature hub 10 is boss 10
a and a flange 10 provided integrally with the boss 10a.
The boss 10a is spline-coupled to the protruding end of the rotating shaft 8 and is fixed by a bolt 13 and a backing plate 14.

The backing plate 14 is prevented from coming off by a plurality of caulking pieces 10c provided on the boss 10a.
The stopper plate 11 is fixed to the outer surface of the flange 10b by a plurality of headed rivets 15. The stopper plate 11 is formed into a substantially triangular shape in a front view by punching a steel plate, and has a circular through hole 11a formed at each top, and a damper cover 17 for accommodating a damper rubber 16 is welded.

The armature 12 is mounted on the inner side of the stopper plate 11. The armature 12 is attached to the stopper plate 11 via a rivet 18 and the damper rubber 16 and faces the friction surface 7e of the rotor 7 with a slight gap G therebetween.

The coil bobbin 20 accommodating the exciting coil 4 is formed of a synthetic resin into an annular body having a U-shaped cross section, and has a bobbin main body 20A and a coil cover 20B whose openings are joined to each other. These components cover the exciting coil 4 and block it from the outside. The coil bobbin 20 is fitted in the annular groove 2a of the yoke 2 and is prevented from coming off from the annular groove 2a by a plurality of caulking pieces 2b provided at the open end of the yoke 2. The joining surface between the bobbin main body 20A and the coil cover 20B is formed on tapered surfaces 19a and 19b inclined at the same angle in opposite directions as shown in FIGS. 7, 8, 14 and 15, and the swaging piece 2b
When caulking is performed, the tapered surfaces cut into each other by a wedge action to further fix the excitation coil 4 and completely shut off the excitation coil 4 from the outside. Also, the outer peripheral surface 2 of the coil cover 20B
Reference numeral 0a is formed on a slope inclined toward the opening of the coil cover 20B, and is press-fitted into the annular groove 2a of the yoke 2.

A rectangular through hole 21 penetrating the bottom plate of the yoke 2 is formed at one circumferential position of the yoke 2 into which the coil bobbin 20 is press-fitted. A storage portion 22 integrally protruding from the outer surface of the bobbin main body 20A protrudes outside the yoke 2.
As shown in FIGS. 4 to 10, the storage portion 22 is formed by four side plates 22a to 22d so as to have a rectangular frame that is long in the circumferential direction of the bobbin main body 20A. In this frame, a silicon diffusion junction type diode 24 as a surge voltage absorbing component for absorbing a surge voltage generated when the power supply to the excitation coil 4 is cut off is housed. 2 having the same structure for electrically connecting the power supply side lead wire 26
The two terminals 27 (27A, 27B) are housed and covered by a terminal cover 28.

The terminal cover 28 includes side plates 22a to 22a.
d, and is fixed to the housing 22 by ultrasonic welding or the like so as to cover the terminals 27A and 27B. A spacer 33 is fitted around the outer periphery of the storage section 22 and is fixed by ultrasonic welding or the like. Four side plates 22a-
Of the 22d, the three side plates 22a, 22b, 22d have the same height and are formed one step higher than the outer side plate 22c. The side plate 22c has locking grooves 27 for the terminals 27A and 27B.
f is locked, and the power supply side lead wire 26 is sandwiched between the terminal cover 28 and the spacer 33.

A central portion in the longitudinal direction of the inner bottom surface 22e of the storage portion 22 is formed one step lower than both side portions to function as a support surface for the diode 24, and two coil drawers communicating with the inside of the bobbin main body 20A. Holes 29a and 29b are provided. As shown in FIGS. 4 and 6, these coil extraction holes 29a and 29b are provided on one side of the diode 24 and are spaced apart from each other in the circumferential direction of the bobbin main body 20A. And the winding end 4b are inserted and pulled out, respectively. Further, the coil extraction hole 2 is formed on the inner side of the bobbin main body 20A.
9 and FIG. 10 are provided at the portions where 9a and 29b are formed.
As shown in FIG. 7, a groove 29c for coil extraction is formed.

On the other hand, two coil engaging grooves 3 into which the winding start end 4a and the winding end 4b of the exciting coil 4 are respectively engaged are formed on both sides of the inner bottom surface 22e of the storage portion 22.
0a, 30b and each lead 24 of the diode 24.
a and 24b are engaged with two lead engaging grooves 31
a, 31b and two terminal engaging grooves 32a, 32b into which the terminals 27A, 27B are press-fitted, respectively. The grooves 30a and 30b for coil engagement and the grooves 31a and 31b for lead engagement are parallel to each other and
It is formed to be longer in the circumferential direction of 0A. The two terminal engagement grooves 32a and 32b are parallel to each other.
Grooves 30a, 30 for engaging the coil.
b, formed to be long in the radial direction of the bobbin main body 20A orthogonal to the grooves 31a and 31b for lead engagement. And
The upper surface of the step portion 22f that partitions the center portion and both side portions of the inner bottom surface 22e of the storage portion 22 is curved in an arc shape as shown in FIG. 9, and the winding start end portion of the exciting coil 4 is attached to this. 4a and the winding end 4b are bent so as to engage with the coil engaging grooves 30a and 30b.

The terminal 27 is made of copper, as shown in FIG.
An elongated main body 2 is formed by bending a conductive metal plate such as brass so as to have a U-shaped cross section.
7a, two opposing side plates 27b and 27c connected to one end of both sides of the main body 27a, and two opposing side plates connected to the other ends of both sides of the main body 27a. Parts 27d and 27e, and
Locking grooves 27f are formed between the side plates 27b and 27d and between the side plates 27c and 27e, respectively. The end faces (4a, 4b) of the exciting coil 4 and the diode 24 are provided on the end surfaces of the side plates 27b, 27c.
Two grooves 34a, 34b into which the respective leads 24a, 24b are respectively engaged are formed, and triangular locking claws 35 are integrally protruded from both side edges. Excitation coil 4
The groove 34a into which the winding start end 4a and the winding end 4b are inserted has a groove edge formed in an edge shape. If the groove edge is formed in an edge shape in this manner, when the winding start end portion 4a and the winding end end portion 4b are inserted, the coil core wire breaks through an insulating film such as enamel which insulates the coil core wire. Therefore, the coil core wire and the terminal 27 can be securely connected.

The leads 24a, 2 of the diode 24
4b is generally not coated with insulation, so that it is not necessary to form the groove edge of the groove 34b in an edge shape. The locking claw 35
Each of the side plates 27b and 27c is provided with the terminal engaging groove 32.
a, 32b when pressed into the terminal engagement groove 32a,
The terminal 27 is prevented from coming off by biting into the groove wall of 32b. When the locking claw 35 hits the groove wall, the side plate 2
7b and 27c are compressed to narrow the grooves 34a and 34b, so that the connection between the terminal 27 and the exciting coil 4 and the diode 24 is further ensured.

The power supply side lead wire 26 has a core end inserted between the side plate portions 27d and 27e along the lower surface of the main body 27a, and these side plate portions 27d and 27e are bent inward to form a power supply side lead wire. By sandwiching the core wire with the insulating portion of 26, it is fixed and electrically connected to the terminal 27.

In order to electrically connect the exciting coil 4, the diode 24 and the power supply side lead wire 26, the plus side power supply side lead wire 26 and the minus side power supply side lead wire 26 are connected to the terminals 27A and 27A in advance.
7B. Further, the coil outlet holes 29a, 29
b, the winding start end 4a and the winding end 4b of the exciting coil 4 are bent outward to form a coil engaging groove 3.
0a and 30b respectively. Further, each lead 24a, 24b of the diode 24 is connected to a lead engaging groove 31.
a and 31b. Next, each terminal 27A,
The grooves 34a and 34b of the 27B are inserted into the grooves 30 for engaging the coil.
a, 30b and the grooves 31a, 31b for lead engagement, respectively, so as to correspond to the side plate portions 27 of the terminals 27A, 27B.
b and 27c are sequentially pressed into the grooves 32a and 32b for terminal engagement.

Thus, the winding start end 4a and the winding end 4b of the exciting coil 4 are connected to the terminals 27A and 27B.
And is electrically connected to these terminals. At the same time, the leads 24a, 24b of the diode 24 are also inserted into the lead grooves 34b of the terminals 27A, 27B and are electrically connected to these terminals 27. As a result, the diode 24 is connected in parallel to the exciting coil 4. When the diode 24 is connected in parallel to the exciting coil 4 in this way, a surge voltage generated when the power supply to the exciting coil 4 is cut off can be absorbed.

FIGS. 1, 2, 11 to 17 and 19
At one circumferential position on the outer surface of the coil cover 20B forming the coil bobbin 20, a thermal fuse 41 as a heat sensing component and two terminals 42 for connecting the thermal fuse 41 to the exciting coil 4 in series (42A,
42B) is integrally provided. The storage portion 40 is formed in a rectangular frame that is long and slightly deformed in the circumferential direction of the coil cover 20 </ b> B by the four side plates 40 a to 40 d, and is covered by the fuse cover 43. The fuse cover 43 is connected to the thermal fuse 41.
After being incorporated in the storage section 40 and connected to the exciting coil 4,
It is welded by ultrasonic welding or the like. Also, the storage unit 40
Is approximately 1 in the circumferential direction with the storage portion 22 of the diode 24.
It is provided at a position shifted by 80 °.

A fuse housing groove 45 for housing the thermal fuse 41 and two coil extraction holes 46a and 46b are provided at a longitudinal central portion of the inner bottom surface 40e of the housing portion 40.
Are formed. The fuse storage groove 45 is provided in the storage section 40.
Are formed long in the longitudinal direction of the coil cover 20B to restrict the thermal fuse 41 from moving in the radial direction of the coil cover 20B.
The coil extraction holes 46a and 46b are located on one side of the thermal fuse 41 and are spaced apart in the longitudinal direction of the fuse housing groove 45, and communicate with the inside of the coil cover 20B. From these coil extraction holes 46a and 46b, two cut ends 4c and 4d provided in the intermediate portion of the exciting coil 4 are provided.
Are inserted and pulled out, and the cut ends 4c and 4d are connected to the respective leads 41a and 41b of the thermal fuse 41 by the terminals 42A and 42B. For this reason,
The exciting coil 4 and the thermal fuse 41 are connected in series.

Such an exciting coil 4 has a cut end 4
After c and 4d are formed, they are incorporated into the coil bobbin 20. That is, a bending portion is provided in the middle of winding the coil,
By cutting the center of this flexure, two cut ends 4c, 4
d. Further, the exciting coil 4 is manufactured by winding the coil. In this state, the cut ends 4c and 4d are exposed on one side surface of the exciting coil 4. Next, the wound up exciting coil 4 is inserted into the bobbin main body 20A, and the winding start end 4a and the winding end end 4b are inserted into the coil extraction holes 29a, 2b.
9b, the coil cover 20
B is covered on a portion of the exciting coil 4 projecting from the bobbin main body 20A. At this time, the cut ends 4c and 4d are pulled out of the coil draw-out holes 46a and 46b into the storage section 40.
Thereafter, the coil bobbin 20 is inserted into the annular groove 2a of the yoke 2 to form a yoke assembly, and is fixed to the housing 1.

The both sides of the inner bottom surface 40e of the housing portion 40 are formed one step higher than the center portion, and two coil engaging grooves 47a into which the cut ends 4c and 4d of the exciting coil 4 are engaged. , 47b and each lead 4 of the thermal fuse 41
Two lead engagement grooves 48 into which 1a and 41b are engaged.
a, 48b and two terminals engaging grooves 49a, 49b into which the terminals 42A, 42B are press-fitted, respectively. The grooves 47a and 47b for coil engagement and the grooves 48a and 48b for lead engagement are formed parallel to each other and long in the circumferential direction of the coil cover 20B. The two terminal engagement grooves 49a and 49b are respectively composed of two parallel grooves, and the coil cover 20B is orthogonal to the coil engagement grooves 47a and 47b and the lead engagement grooves 48a and 48b. Are formed in the radial direction.

The terminal 42 is made of copper, as shown in FIG.
By bending a conductive metal plate such as brass or the like, it is formed so as to have a U-shaped cross section similarly to the terminal 27, and an elongated main body 42a and this main body 42a
Opposing side plate portions 42 connected to both side edges of the
b, 42c. Also, each side plate portion 42
b, 42c, the cut ends 4c, 4d of the exciting coil 4 and the leads 41a, 41b of the thermal fuse 41
Are formed respectively, and triangular locking claws 52 are integrally formed on both side edges thereof.

The groove 51a of the terminal 42 is
Similarly to the groove 34a, the edge of the groove is formed in an edge shape, and when the cut ends 4c and 4d of the excitation coil 4 are inserted, the edge of the excitation coil 4 breaks through an insulating film such as enamel which covers the coil core. By cutting into the coil core wire,
The coil core wire is electrically connected to the terminal 42. The leads 41a and 41b of the thermal fuse 41
As is the case with the leads 24a and 24b of the diode 24 described above, since they are not usually coated with insulation, the groove edges need not be formed in an edge shape only by setting the groove width of the groove 51b to be slightly smaller than the coil diameter. The locking claw 52 has a configuration in which the side plate portions 42b and 42c are formed by the terminal engagement grooves 49a and 49b.
When the terminal 42 is press-fitted, the terminal 42 is prevented from coming off by biting into the groove walls of the terminal engagement grooves 49a and 49b.

In order to electrically connect the exciting coil 4 and the thermal fuse 41, the cut ends 4c and 4d of the exciting coil 4 are bent to engage the coil engaging grooves 47a and 47b, respectively. Further, each lead 41a of the thermal fuse 41,
41b is engaged with the lead engaging grooves 48a and 48b, respectively. Next, the grooves 51a, 51 of the terminals 42A, 42B are formed.
b correspond to the coil engaging grooves 47a, 47b and the lead engaging grooves 48a, 48b, respectively.
What is necessary is just to press-fit the side plate parts 42b, 42c of 2A, 42B into the groove 49a, 49b for terminal engagement sequentially.

Thus, the cut end 4 of the exciting coil 4
c, 4d are grooves 51a for the coils of the terminals 42A, 42B.
And are electrically connected to these terminals 42,
The leads 41a and 41b of the thermal fuse 41 are also inserted into the lead grooves 51b of the terminals 42A and 42B and are electrically connected to these terminals 42. As a result, the thermal fuse 41 is connected to the cut end 4c of the exciting coil 4,
4d and are connected in series to the exciting coil 4. Further, each side plate portion 42b, 42c is formed with a groove 4 for terminal engagement.
9a and 49b, the locking claws 52 bite into the groove walls of the terminal engaging grooves 49a and 49b.
42B does not fall out of the terminal engagement grooves 49a, 49b.

In the present embodiment, a temperature fuse 41 is used as a protection device for the electromagnetic clutch when the rotating shaft 8 of the compressor is locked, and the temperature fuse 41 is blown by heat to connect to the exciting coil 4. However, the present invention is not limited to this. For example, a heat-sensing component such as a bimetal may be used, and a switch may be provided that changes its shape with a rise in temperature and cuts off current to the exciting coil 4. It may be. Further, although a silicon diffusion junction type diode is used as a component for absorbing a surge voltage, other surge voltage absorbing components may be used.

In the electromagnetic clutch having such a structure, when the exciting coil 4 is energized when the rotor 7 is driven from the driving side and rotates on the nose portion 1a of the housing 1, the armature 12 is turned off. Rotor 7
Is magnetically attracted to the friction surface 7e. That is, when the exciting coil 4 is excited, a magnetic circuit is formed from the yoke 2 through the outer pole of the rotor 7, and then passes through the armature 12 and returns to the yoke 2 through the inner pole of the rotor 7.
Is attracted to the rotor 7 against the elastic force of the damper rubber 16. As a result, the armature 12 rotates integrally with the rotor 7, and the rotating shaft 8 integrated with the armature 12 rotates to operate the refrigerant compressor. When the energization of the excitation coil 4 is stopped, the armature 12 is separated from the rotor 7 by the elastic force of the damper rubber 16 and returns to the original position shown in FIG. Stops.
When the damper rubber 16 is used, the armature 12
Is reduced when the rotor is magnetically attracted to the rotor 7,
Moreover, the impact is reduced.

In the electromagnetic clutch having such a structure, the winding start end 4a and the winding end end 4b of the exciting coil 4 are previously provided on the outer surface of the bobbin main body 20A.
2 and are engaged with the grooves 30a and 30b for coil engagement, and the leads 24a and 24b of the diode 24 are engaged with the grooves 31a and 31b for lead engagement. 27 (27A, 27B) are sequentially press-fitted into the terminal engaging grooves 32a, 32b to electrically connect the winding start end 4a, the winding end 4b of the exciting coil 4 and the leads 24a, 24b of the diode 24. Therefore, the work of connecting the exciting coil 4 and the diode 24 is easy without the need for soldering work or the like.

When the winding start end 4a and the winding end 4b of the exciting coil 4 are inserted into the coil groove 34a of the terminal 27, the edge of the groove 34a formed on the edge of the coil insulates the coil core. Since the insulating film is broken through and cut into the coil core wire, it is not necessary to remove the insulating film in advance, and the coil core wire and the terminal 27 can be securely connected.
Further, since the terminal 27 is integrally provided with the locking claw 35,
There is no escape from the terminal engaging grooves 32a and 32b. Further, the type and number of the terminals 27 can be reduced as compared with the above-mentioned prior art 1, so that it is possible to reduce the cost and reduce the size of the storage section 22.

The cut ends 4c, 4c,
4d is pulled out into the accommodating portion 40 of the coil cover 20B and engaged in the coil engaging grooves 47a and 47b, and the leads 41a and 41b of the thermal fuse 41 are connected to the lead engaging grooves 4a and 47b.
8a, 48b, and in this state, two terminals 4
2 (42A, 42B) into the grooves 49a, 49b for engaging the terminals.
, The cut ends 4c, 4d of the exciting coil 4
And the leads 41a and 41b of the thermal fuse 41 can be electrically connected, so that soldering or the like is not required similarly, and the connection between the exciting coil 4 and the thermal fuse 41 is easier than in the prior art 2. It is.

The cut ends 4c, 4d of the exciting coil 4
Into the coil groove 51a of the terminal 42, the groove 51
Since the edge of the groove formed in a in FIG. 1a penetrates through the insulating film of the exciting coil 4 and cuts into the coil core wire, the coil core wire and the terminal 42 are electrically connected, so that there is no need to remove the insulating film and the connection is made one layer. Make work easier. Also, since the storage section 40 is covered by the fuse cover 43,
The thermal fuse 41 can be protected without having to be molded with a synthetic resin as in the prior invention 3. Further, since the terminal 42 is integrally provided with the locking claw 52, it does not come out of the terminal engaging grooves 49a and 49b.

In the above-described embodiment, an example is shown in which the present invention is applied to an electromagnetic clutch. However, the present invention can be similarly applied to an electromagnetic brake in which an armature is magnetically attracted directly to a yoke. Similar effects can be obtained.

[0044]

According to the electromagnetic coupling device of the present invention, in the first accommodating portion provided on the bobbin main body in which the exciting coil is inserted, the winding start and end ends of the exciting coil and the leads of the surge voltage absorbing component are provided. Are electrically connected to each other by a pair of terminals to which the power supply side lead wires are connected, respectively, and in a second storage portion provided on a coil cover covered by the excitation coil, a cut end of the excitation coil and It consists of a structure in which the lead of the heat sensing component is electrically connected with a pair of terminals,
Since the bobbin main body and the coil cover are inserted into the annular groove of the yoke having the through hole into which the first storage portion is inserted at the bottom, the terminal cover and the fuse are inserted into the first and second storage portions. Since the cover is fixed, the work of casting molding resin to insulate and waterproof the excitation coils, terminals, and electrical components is omitted, and there is no need to perform welding or soldering as in the past. Since the connection operation between the coil and the electric component can be easily performed in a short time, the productivity of the electromagnetic coupling device is improved.

Further, in the electromagnetic coupling device according to the present invention, the first and second terminals are formed in a U-shape, and the two side plates facing each other are provided with a groove for coil engagement and a groove for lead engagement. And the first and second storage sections are provided with a terminal engaging groove into which the side plate sections of these terminals are engaged. No quality problems such as defects occur. Further, since the exciting coil and the electric component are connected by such a U-shaped terminal, the size of the first and second storage sections can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electromagnetic clutch according to the present invention.

FIG. 2 is a front view of the yoke assembly.

FIG. 3 is a rear view of the yoke assembly.

FIG. 4 is an enlarged view of a main part of FIG. 3 and is a plan view of a storage unit with a terminal cover removed.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a plan view of a storage section of the bobbin main body.

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

FIG. 8 is a sectional view taken along line CC of FIG. 6;

FIG. 9 is a sectional view taken along line DD of FIG. 6;

FIG. 10 is a view taken in the direction of arrow E in FIG. 9;

FIG. 11 is an enlarged view of a main part of FIG. 2, with a fuse cover and one terminal of a storage part removed.

FIG. 12 is a sectional view taken along line FF of FIG. 11;

FIG. 13 is a plan view of a storage section of the coil cover.

FIG. 14 is a sectional view taken along line GG of FIG.

FIG. 15 is a sectional view taken along line HH of FIG.

FIG. 16 is a sectional view taken along line II of FIG. 13;

FIG. 17 is a sectional view taken along line JJ of FIG. 13;

18 (a) and (b) are a bottom view and a side view of a terminal.

FIGS. 19A and 19B are a bottom view and a side view of a terminal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 ... Yoke 2a ... Annular groove 4 ... Exciting coil 4a ... Winding end 4b ... Winding end 4c ... Cutting end 4d ... Cutting end 20 ... Coil bobbin 22 ... Storage part 24 ... Diode 26 ... Power supply side lead wire 27 ... Terminal 27b ... Side plate part 27c ... Side plate part 30a ... Coil engagement groove 30b ... Coil engagement groove 31a ... Lead engagement groove 31b ... Lead engagement groove 32a ... Terminal engagement groove 32b ... terminal engagement groove 34a ... groove 34b ... groove 35 ... locking claw 40 ... storage part 41 ... temperature fuse 41a ... lead 41b ... lead 42 ... terminal 42b ... side plate part 42c ... side plate part 49a ... terminal engagement Grooves 49b: Grooves for terminal engagement 52: Locking claws

Claims (3)

[Claims] An exciting coil, a bobbin main body in which the exciting coil is inserted, a first storage unit provided integrally with the bobbin main unit, and an inner bottom surface of the first storage unit. A winding start winding end end of the exciting coil, a surge voltage absorbing component housed in the first storage section, and a winding start winding end end housed in the first storage section; A pair of first terminals to which the leads of the component are connected and to which the power supply side lead wires are respectively connected;
A terminal cover fixed to the first storage portion, a coil cover covered by the excitation coil projecting from the bobbin main body, a second storage portion provided integrally with the coil cover, A cut end of the exciting coil pulled out from the inner bottom surface of the second storage part, a heat sensing component stored in the second storage part, and a cut end stored in the second storage part. A pair of second terminals for connecting the leads of the heat sensing component, a fuse cover fixed to the second storage portion, and a through hole into which the first storage portion is inserted is formed in a bottom portion; An electromagnetic coupling device, wherein a bobbin main body and a yoke in which the coil cover is inserted are provided in an annular groove. 2. The electromagnetic coupling device according to claim 1, wherein
The first terminal is formed in a U-shape, and two opposing side plates are provided with grooves into which the winding start and end ends of the exciting coil and the leads of the surge voltage absorbing component are respectively engaged,
A coil extraction hole from which the winding start and end ends of the excitation coil are drawn out, and a coil engagement hole into which the winding start and end ends of the excitation coil are engaged, on the inner bottom surface of the first storage portion. And a lead engaging groove into which the lead of the surge voltage absorbing component is engaged. On the inner side surface of the side plate of the first storage portion, each side plate portion of the first terminal is provided. An electromagnetic coupling device is provided with a terminal engaging groove into which each is engaged. 3. The electromagnetic coupling device according to claim 1, wherein the second terminal is formed in a U-shape, and the cut end of the exciting coil and the heat sensing component are formed on two opposing side plates. A groove into which a lead is engaged is provided, and a coil extraction hole from which a cut end of the excitation coil is extracted and a cut end of the excitation coil are engaged on an inner bottom surface of the second storage portion. A groove for engaging a coil, and a groove for engaging a lead into which a lead of the heat sensing component is engaged.
An electromagnetic coupling device, wherein a terminal engaging groove into which each side plate of the second terminal is engaged is provided on the inner side surface of the side plate of the storage section.