JP3016552B2 - Coil assembly - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil assembly in which a starting end and an ending end of an electromagnetic coil are electrically connected to a lead wire by terminals held on a coil bobbin.

[0002]

2. Description of the Related Art A conventional coil assembly is provided with a flange of a coil bobbin so as to prevent the insulating coating on the winding start end of the electromagnetic coil from being peeled off during the winding operation and to effectively utilize the coil winding space of the coil bobbin. A terminal accommodating portion is formed in the portion to hold a pair of terminals. And each terminal has
The winding start end and the winding end of the electromagnetic coil pulled out from the coil winding space are entangled and soldered, and a lead wire is connected. Such a coil assembly includes a through hole communicating with an annular groove serving as a coil winding space and the through hole from a radial outside of a flange portion, as proposed in, for example, Japanese Patent Application Laid-Open No. 53-23065. A pair of terminal accommodating portions, each having a slit cut into the coil bobbin, are provided integrally with the flange portion of the coil bobbin so as to protrude in the direction of the center line of the coil bobbin. And
After drawing the winding start end of the electromagnetic coil from the slit into the through hole of one terminal housing, winding the electromagnetic coil in the annular groove of the coil bobbin, and winding the end of the electromagnetic coil from the slit to the other end. It is drawn into the through hole of the terminal housing. Further, the terminals are individually press-fitted into the respective terminal accommodating portions, and an engaging portion formed in the terminal accommodating portion and a through hole formed in the terminal are engaged. Furthermore, at each terminal, the winding start end and the winding end end of the electromagnetic coil drawn out from the through hole of each terminal accommodating portion are tangled and soldered, and the conductive core wire of the lead wire is tangled. And are electrically connected.

[0003]

In a conventional coil assembly having such a structure, a coil of an electromagnetic coil is wound by tying a conductive core wire at the tip of a lead wire having a broken insulation coating to a terminal. Since the start end and the winding end are electrically connected to the lead wire, there is a problem that the assembling work is troublesome and the productivity of the coil assembly is low. Also,
There is a possibility that the connection between the conductive core wire of the lead wire and the terminal may be broken due to a light tensile force, and quality improvement is required. Furthermore, since the winding start end and the winding end end of the electromagnetic coil must be drawn into the through hole of the terminal accommodating portion from the slit formed in the flange portion of the coil bobbin, winding work is troublesome, and the coil assembly is time consuming. There were also problems such as poor three-dimensional productivity. SUMMARY OF THE INVENTION An object of the present invention is to provide a coil assembly capable of simplifying a winding operation and an assembling operation. It is another object of the present invention to provide a coil assembly capable of preventing disconnection of a connecting portion between a lead wire and a terminal due to a light tensile force.

[0004]

In order to achieve the above object, a coil assembly according to the present invention is provided with an annular groove which opens radially outward, and has an inner surface of one of the flanges which is formed from an outer surface. A coil holding portion formed with a concave portion extending in the circumferential direction toward the bottom of the annular groove, and protruding radially outward from an outer peripheral surface of the flange portion including a portion where the concave portion is formed, A coil bobbin provided with a pair of terminal press-fitting chambers on the front side and a terminal accommodating section formed on the back side with a pair of spaced-apart guides, and cuts from the upper wall to the opposing side wall A U-shaped crimped portion formed with a slit formed and held in the terminal press-fitting chamber, and a rod-shaped protruding from one side wall of the crimped portion over the center line of the slit and protruding outward in the radial direction of the terminal accommodating portion. Pin terminals are provided integrally Wound around the annular groove through the pair of terminals and the concave portion, and a winding start end and a winding end end pass between the guide portions of the terminal accommodating portion and are electrically connected to the pin terminal portion. And a pair of lead wires crimped to the slit of the crimping portion and pulled out from the terminal accommodating portion in the projecting direction of the pin terminal portion.

The coil assembly according to the present invention further comprises a cylindrical portion fitted to the outer peripheral surface of the coil holding portion of the coil bobbin, and a terminal protruding radially outward from one opening side of the cylindrical portion. A coil cover provided with an overhang portion covered on the back side of the housing portion, and a terminal cover fitted on the front side of the terminal housing portion of the coil bobbin and fitted into the opening of the overhang portion of the coil cover. Wherein the lead wire is sandwiched between a groove formed in the opening of the projecting portion of the coil cover and the opening of the terminal cover.

In the above-described coil assembly of the present invention, the terminal cover may be provided with a pressing portion for pressing the lead wire to the deepest side of the slit of the crimping portion, or the terminal press-fitting chamber may be provided. It is preferable to form terminal engaging grooves at the four corners of the terminal so that protrusions formed on each side wall of the crimping portion of the terminal bite into the wall surfaces of the terminal engaging grooves.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A coil assembly shown in FIGS. 1 to 12 will be described below as an embodiment of the present invention. FIG. 1 is a sectional view of an electromagnetic spring clutch in which a coil assembly is incorporated, FIG. 2 shows only the exciting device of FIG. 1, and is a sectional view taken along line AA of FIG. 3, and FIG. FIG. 3 is a front view of the excitation device from which is removed, and is a left side view of FIG. 2. 4 shows only the coil bobbin of FIG. 2 and is a sectional view taken along line BB of FIG. 5, and FIG. 5 is a front view of the coil bobbin and is a left side surface of FIG. 6 is a cross-sectional view of the coil bobbin, which is a cross-sectional view taken along line CC of FIG. 4, FIG. 7 is a side view of the coil cover serving as the right side of FIG. 8, and FIG. 8 is a left side view of FIG. It is a front view. 9 to 11
Is a terminal cover, FIG. 9 is a rear view showing the right side of FIG. 10, FIG. 10 is a sectional view taken along line DD of FIG. 9, and FIG.
It is an arrow side view. 12A and 12B show terminals, FIG. 12A is a plan view, FIG. 12B is a right side view, and FIG. 12C is a front view.

Since the coil assemblies shown in these drawings are incorporated in the electromagnetic spring clutch 1, the overall structure of the electromagnetic spring clutch 1 will be described. The electromagnetic spring clutch 1 is mounted on a rotating shaft 2 on the driving side of a paper feeding mechanism of a copying machine, and is used as a device for transmitting or blocking rotation on the driving side to a rotating shaft on a driven side to which a paper feeding roller is mounted. You. The rotating shaft 2 has a shaft end 2 a formed in a non-cylindrical shape (for example, a D-shaped cross section), and
A pair of locking grooves 2b in which snap rings 3 (3a, 3b) for preventing the electromagnetic spring clutch 1 mounted from the side a from moving in the axial direction are formed. The rotating shaft 2 is inserted into a shaft hole of the first rotating member 4 in which a fitting portion 4a formed of a non-cylindrical shaft hole into which the shaft end 2a is fitted. The first rotating member 4 is made of a synthetic resin material among non-magnetic materials, and is removed from one end in the axial direction (the end abutted against the snap ring 3a) by the other end (the snap ring 3b). The outer peripheral surface gradually increases toward the stopped end).

That is, on the outer peripheral surface of the first rotating member 4, a cylindrical first bearing portion 4b having a locking groove 5a in which the snap ring 5 is locked, and the first bearing portion 4b, a cylindrical spring-tightened portion 4c having an outer diameter larger than that of the spring-tightened portion 4c, a cylindrical second bearing 4d having an outer diameter larger than that of the spring-tightened portion 4c, and an outer diameter of the second bearing 4d. A cylindrical third bearing portion 4e having a large dimension is formed. An annular flange 4f having an outer diameter larger than that of the third bearing 4e is formed at the outermost end of the third bearing 4e. Note that the recessed groove indicated by reference numeral 4g is provided for reducing the weight of the first rotating member 4 and for other purposes. Further, a ring-shaped rotor 6 made of a magnetic material and fixed as a magnetic flux detour is fixed to the first rotating member 4. The rotor 6 is integrally fixed to the first rotating member 4 by insert molding. The outer diameter of the cylindrical outer peripheral surface is slightly smaller than the outer diameter of the third bearing portion 4e. It is formed larger than the outer diameter of the second bearing portion 4d.

The first rotating member 4 having such a shape rotatably supports a second rotating member 7 made of a synthetic resin material among non-magnetic materials on its first bearing portion 4b. I have. The second rotating member 7 is abutted against a wall surface 4h which transitions from the first bearing portion 4b to the spring tightening portion 4c and is prevented from falling off by a snap ring 5, and has one end in the axial direction (to the wall surface 4h). The outer peripheral surface gradually increases from the end on the side to which it is abutted) to the other end (the end stopped by the snap ring 5). That is, on the outer peripheral surface of the second rotating member 7, a cylindrical spring tightening portion provided with an outer diameter equal to or slightly larger than the outer diameter of the spring tightening portion 4 c of the first rotating member 4. 7a, a fourth cylindrical bearing 7b provided with the same outer diameter as the outer diameter of the second bearing 4d of the first rotating member 4, and a third bearing 7b of the first rotating member 4. A cylindrical fifth bearing portion 7c provided with the same outer diameter as the outer diameter of the bearing portion 4e, and an annular flange portion 7d having an outer diameter larger than the fifth bearing portion 7c are formed. Have been. Further, a through hole 7e is formed in the spring tightening portion 7a so that one end of a coil spring 8 described later is locked. Further, a gear portion 7f that meshes with a gear (not shown) is formed on the outer peripheral surface on the other end side. A coil spring 8 is fitted over the spring tightening portion 4c of the first rotating member 4 and the spring tightening portion 7a of the second rotating member 7 described above. One winding end of the coil spring 8 is locked in a through hole 7 e of the second rotating member 7. The other winding end of the coil spring 8 is
The armature 9 is locked by a notch 9 a formed on one open end side. In the non-excitation state in which the energization to the electromagnetic coil 14 of the coil assembly described later is stopped,
A slight annular gap (not shown) is formed between the inner peripheral surface of the coil spring 8 and the outer peripheral surface of the spring tightening surface 4c of the first rotating member 4.

The armature 9 has one opening end at the first end.
Is a cylindrical member made of a magnetic material which is supported by the second bearing portion 4d of the rotating member 4 and has the other open end supported by the fourth bearing portion 7b of the second rotating member 7. At the end,
In addition to the notch 9a, a plurality of grooves 9b
Are formed. The concave groove 9b is a groove which opens radially inward and outward with respect to the rotor 6 side.
As described in Japanese Patent Publication No. 502111, it is provided to prevent wear powder from being deposited on the frictional engagement surface between the armature 9 and the rotor 6 and for another purpose. Further, the armature 9 has one opening end in contact with a wall surface 7g of the second rotating member 7 which transitions from the fourth bearing portion 7b to the fifth bearing portion 7c. Rotor 6
Are axially opposed to each other with an annular first gap.

Next, the excitation device 10 in which the coil assembly is accommodated will be described. The excitation device 10 is provided with a first core 11 and a second core 12, which are formed by drawing a steel plate made of a magnetic material by press working. The first core 11 includes a disk portion 11a, a cylindrical magnetic pole portion 11b bent in the axial direction from the inside of the disk portion 11a, and a disk portion 11a.
11c extending radially outward from outside
The cross-section of the transition from the disk portion 11a to the magnetic pole portion 11b is formed at a corner 11d having a convex arc shape, and the outer peripheral wall at the tip of the magnetic pole portion 11b is closer to the tip. The cross section of which the diameter is reduced is formed at the convex arc-shaped corner portion 11e. Further, a pair of arc-shaped protruding portions 11f protruding outward in the radial direction and a U-shaped notch into which a terminal accommodating portion 17 of the coil bobbin 13 described later is fitted on the outer peripheral surface of the disk portion 11a. An arc-shaped protruding portion 11h on which a portion 11g is formed is formed.

The second core 12 has a disk portion 12a which faces the disk portion 11a of the first core 11 in the axial direction, and is bent in the axial direction from the outside of the disk portion 12a and has a tip portion of the first core. An annular member comprising a cylindrical portion 12b fitted on the outer peripheral surface of the disk portion 11a of the core 11 and a cylindrical magnetic pole portion 12c bent in the axial direction from the inside of the disk portion 12a. A part that transitions from the plate part 12a to the cylindrical part 12b and a part that transitions from the disk part 12a to the magnetic pole part 12c are:
The cross-section is formed at the convex arc-shaped corners 12d and 12e, and the outer peripheral wall at the tip of the magnetic pole portion 12c is formed at the convex arc-shaped corner 12f with a diameter decreasing toward the tip. Further, a notch portion 12g in which a flange portion 11c of the first core 11 and an arc-shaped protruding piece 19b of a coil cover 19 described later are fitted at a distal end portion of the cylindrical portion 12b, A notch 12h in which the pair of protrusions 11f and 11h provided on the disk portion 11a are fitted, and a notch 12i in which a projecting portion 20 of the coil cover 19 to be described later are fitted are formed. I have.

The first core 11 and the second core 12 having such shapes are connected to the third bearing portion 4e of the first rotating member 4.
And the fifth bearing part 7c of the second rotating member 7 are fitted and supported. Further, the flange 4 is fitted to the third bearing 4e.
In a state where the magnetic pole portion 11b is abutted against the rotor f, the tip of the magnetic pole portion 11b of the first core 11 extends to the outside in the radial direction of the rotor 6, and the magnetic pole portion 11b extends Is formed with an annular second gap. Further, in a state where the magnetic pole portion 12c of the second core 12 is fitted to the fifth bearing portion 7c and abutted against the flange portion 7d, the tip of the magnetic pole portion 12c is radially outward on the opening end side of the armature 9. And the inner peripheral surface and armature 9
An annular third gap is formed between the outer peripheral surface and the outer peripheral surface. A space provided between the magnetic pole portion 11b and the magnetic pole portion 12c which are opposed in the axial direction and provided outside in the radial direction of the armature 9 is provided as an annular demagnetized region S for bypassing magnetic flux. I have. The first core 11
The corners 11e and 12f of the second core 12 are provided by forming portions bent radially inward from the tips of the magnetic pole portions 11b and 12c by press working. The bent part is the core 11
Twelve manufacturing steps have been cut off.

Next, a coil assembly shown as an embodiment of the present invention will be described in detail. The coil assembly is housed in an annular space surrounded by the first core 11, the second core 12, and the demagnetization region S, and the coil bobbin 13
Has an electromagnetic coil 14 wound therearound. Coil bobbin 13
FIGS. 4, 5 and 6 are manufactured from a synthetic resin material.
The shape is as shown in FIG. In other words, the coil bobbin 13 has a coil holding portion 15 for the electromagnetic coil 14 and a terminal housing for housing a pair of terminals 16 for electrically connecting the winding start end 14 a and the winding end end 14 b of the electromagnetic coil 14 to the lead wire 22. A part 17 is provided. The coil holding unit 15
An annular groove 15a that opens outward in the radial direction around which the electromagnetic coil 14 is wound, and a wear powder reservoir 15b surrounded by an annular wall integrally formed on the inner peripheral surface of the coil holding portion 15 are formed. The wear powder accumulation portion 15b is disposed in the demagnetization region S of the excitation device 10, and its annular groove 15c is opened on the first gap side between the armature 9 and the rotor 6. In addition, on the inner surface of one flange of the coil holding portion 15, the outer peripheral surface is directed toward the bottom of the annular groove 15a from the outer peripheral surface so that the insulating coating of the winding start end 14a of the electromagnetic coil 14 does not peel off during the winding operation. A recess 15d (see FIG. 6) extending in the circumferential direction is formed. Further, a terminal accommodating portion 17 protruding radially outward from an outer peripheral surface including a portion where the above-described recessed portion 15d is formed is integrally formed with the flange portion.

On the front side of the terminal accommodating portion 17, a pair of terminal press-in chambers 17a and 17b are provided at an interval on the left and right.
On the inner walls of the terminal press-fitting chambers 17a and 17b, a pair of guide walls 18 each having a shape in which the corners 18a at both upper ends (see FIG. 4) are chamfered in a tapered shape, and between the guide walls 18 and the inner walls. The terminal press-fitting chambers 17a and 17b are provided with terminal engaging grooves 18b formed at four corners thereof.
The terminal holding groove 18c and the terminal leading groove 18d formed on the same center line are formed on the inner and outer walls in the radial direction of the a.17b.
Are formed. The left and right sides of the outer wall of the terminal accommodating portion 17 that are radially inside are terminal covers 21 to be described later.
A pair of concave grooves 18e into which the protrusions 211 are fitted are formed, and a pair of protrusions 18f which are engaged with through holes 21f of the terminal cover 21, which will be described later, are formed on the right and left sides in the radial direction. I have. Further, a pair of guide portions 18g (see FIG. 6) on which the ends of the electromagnetic coil 14 come into contact when the winding start end 14a and the winding end end 14b are led out are provided on the back side of the terminal accommodating portion 17. It protrudes at intervals. A fitting groove 18h that is deeper toward the front of the terminal accommodating portion 17 is formed on a side surface of each of the guide portions 18g facing each other. As shown by the two-dot chain line, the winding start end 14a and the winding end end 14b of the electromagnetic coil 14 are fitted into the fitting groove 18h.
And is led out from the tapered surface 18i to a pin terminal portion 16d described later.

A coil cover 19 shown in FIGS. 7 and 8 is covered on the outside of the coil bobbin 13 having such a shape. The coil cover 19 is a cylindrical member made of a synthetic resin material. A radially inward annular flange portion 19a is formed at one open end of the coil cover 19 so as to abut against the outside of the flange portion of the coil bobbin 13. At the open end of the
A radially outwardly projecting arc-shaped protruding piece 19b fitted into the notch 12g of the core 12 and a radially outwardly projecting portion 20 covering the back side of the terminal accommodating portion 17 of the coil bobbin 13 are formed. Have been. The plurality of protrusions indicated by reference numeral 19c are pressed into the outer peripheral surface of the flange of the coil bobbin 13. The overhang portion 20 is provided with a partition wall portion 20a fitted between a pair of guide portions 18g formed on the terminal housing portion 17 of the coil bobbin 13, and each of the recesses 20b divided by the partition wall portion 20a is a terminal housing portion. On the back surface of 17, the winding start end 14a and the winding end end 14b of the electromagnetic coil 14 are covered by a guide portion 18g which is led out.
In addition, the overhang portion 20 has a winding start end 1 of the electromagnetic coil 14.
4a and a terminal 1 to be described later in which the winding end 14b is entangled.
A pair of accommodation chambers 20c accommodating the six pin terminal portions 16d.
And a pair of semicircular grooves 20 into which the lead wires 22 are fitted.
d and protrusions 20e for preventing the lead wire 22 formed in each groove 20d from coming off. Further, on the outside in the radial direction of the protruding portion 20, an engaging portion 2 having a through-hole in which a locking piece 21j of the terminal cover 21 described later is formed is formed.
0f is provided. The base of the overhang 20 indicated by reference numeral 20g is fitted into the notch 12i of the second core 12.

Next, the shape of the terminal cover 21 that covers the overhanging portion 20 of the coil cover 19 will be described.
The terminal cover 21 is made of a synthetic resin material and has a shape as shown in FIGS. That is, the lead wire 22 is attached to the crimping portion 16b of the terminal 16 described later on the inner bottom portion.
A plurality of pressing portions 21 which are overlapped with the terminal press-fitting chambers 17a and 17b of the coil bobbin 13 and protrude so as to face each other in order to press the slit 16a formed at the deepest portion side.
a is formed. Further, a stepped wall portion which is a long side facing left and right in FIG. 9 is divided by a pair of slits 21b, and a space between the slits 21b is an elastically deformable engaging portion 21c. Further, an engaging portion 21e which is similarly elastically deformable by a pair of slits 21d is formed on a wall portion which is an upper short side among short sides opposed vertically in FIG. Then, the engaging portion 21
The protrusion 18f provided in the terminal accommodating portion 17 of the coil bobbin 13 is engaged with the through hole 21f formed in the coil c, and the engagement piece 21g provided at the tip of the engagement portion 21e is provided with the notch of the first core 11. 11g.

The lower short side wall of the terminal cover 21 is formed with a pair of grooves 21h into which the lead wires 22 are fitted. An engaging piece 21j provided at the tip of 21i is engaged with an engaging portion 20f provided on the projecting portion 20 of the coil cover 19. A protrusion 21k for preventing the lead wire 22 from coming off is formed at the bottom of the groove 21h. Also, reference numeral 21l
The rod-shaped protruding portion indicated by is a convex portion fitted into the concave groove 18e provided in the terminal accommodating portion 17 of the coil bobbin 13.
Further, the protruding portion indicated by reference numeral 21m is a rib provided for reinforcement.

Next, the shape of the terminal 16 made of a conductive material will be described. The terminal 16 is provided with a U-shaped crimping portion 16b in which a step-like slit 16a cut from the upper wall to the opposing side wall is formed. A rod-shaped holding pin 16c extending from one side wall of the crimping portion 16b and a rod-shaped pin terminal portion 16d extending from the other side wall are provided on the center line of the slit 16a. Press-pressed ribs 16e are formed on the pin terminal portions 16d, and protrusions that bite into the wall surfaces in the terminal engagement grooves 18b provided in the terminal press-in chambers 17a and 17b of the coil bobbin 13 are formed on the corners of the side walls. 16f are formed.

A coil assembly having a plurality of parts having such a shape is assembled by the following procedure. That is, after the winding start end portion 14a is passed through the concave portion 15d, the annular groove 15 of the coil holding portion 15 of the coil bobbin 13 is moved.
The electromagnetic coil 14 is wound around a. Next, the electromagnetic coil 14
In a state where each end is pulled out, a pair of terminals 16 is pressed into the terminal accommodating portion 17 of the coil bobbin 13. The crimping portion 16b of the terminal 16 has a protrusion 16 on the wall surface inside the terminal engagement groove 18b.
Since f is bitten, it is held in the terminal press-fitting chambers 17a and 17b. Further, the holding pin 16c of the terminal 16 is
8c and the pin terminal portion 16 of the terminal 16
d projects out of the terminal receiving portion 17 from the terminal lead-out groove 18d. A pair of protruding pin terminal portions 16d are provided with a winding start end portion 14a and a winding end end portion 14b of the electromagnetic coil 14 which are pulled out from the coil holding portion 15 through the fitting groove 18h of the guide portion 18g and the tapered surface 18i. It is entangled and fixed by soldering. The lead wire 22 is crimped to the slit 16a of the crimping portion 16b of the terminal 16, the insulating coating portion is broken, and the conductive core wire is electrically connected to the terminal 16. Then, the lead wire 22 pulled out from the terminal accommodating portion 17 and the pin terminal portion 16 d overlap in the center line direction of the coil bobbin 13.

After the completion of the winding operation and the connection operation, the coil cover 19 is fitted on the outer peripheral surface of the coil holding portion 15 of the coil bobbin 13. On the back side of the terminal accommodating portion 17 of the coil bobbin 13, a partition wall portion 20 a is fitted between a pair of guide portions 18 g to cover the projecting portion 20 of the coil cover 19, and a flange of the coil holding portion 15 of the coil bobbin 13. The protrusion 19c of the coil cover 19 is press-fitted into the outer peripheral surface. The lead wire 22 is fitted into the groove 20d of the overhang portion 20 of the coil cover 19. Next, the terminal cover 21 is put on the front side of the terminal accommodating portion 17 of the coil bobbin 13. The projecting portion 18f of the terminal accommodating portion 17 is engaged with the through hole 21f, and the engaging piece 21j is engaged with the engaging portion 20f of the coil cover 19. The lead wire 22 is pressed and held by the pressing portion 21 a of the terminal cover 21 toward the deepest portion side of the slit 16 a of the terminal 16, and is held by the groove 20 d of the coil cover 19.
Protrusion 20e in the inside and protrusion 2 in the groove 21h of the terminal cover 21
1k bites into the insulating coating and is fixed. After the coil cover 19 and the terminal cover 21 are covered, the coil assembly is covered with the first core 11 and the second core 12, and the outer peripheral surface of the disk portion 11a of the first core 11 is covered by the coil assembly. The open end of the cylindrical portion 12b of the second core 12 is press-fitted.

In the electromagnetic spring clutch 1 in which the coil assembly having the above-described structure is incorporated, the rotating shaft 2, the first rotating member 4, and the rotor 6 fixed to the first rotating member 4 rotate. When the electromagnetic coil 14 of the coil assembly is energized during the operation, the magnetic flux is diverted from the magnetic pole portion 11b of the first core 11 to the rotor 6 through the second gap,
Since it flows from the rotor 6 to the armature 9 through the first gap and from the armature 9 to the magnetic pole portion 12c of the second core 12 through the third gap, the armature 9
Are magnetically attracted to the rotor 6 and rotate. Then, the coil spring 8 is wound around the spring winding portions 4c and 7a, and the first rotating member 4 and the second rotating member 7 rotate integrally. When the excitation state is changed to the non-excitation state in which the energization to the electromagnetic coil 14 of the coil assembly is stopped, the magnetic flux disappears and the armature 9 is separated from the rotor 6. Therefore, the coil spring 8 self-returns by its elastic force, and the inner peripheral surface of the coil spring 8 is separated from the spring tightening surface 4c of the first rotating member 4, so that the second rotating member 4 Of the rotation to the rotating member 7 is shut off.

In the above description, an example in which the coil assembly shown as the embodiment of the present invention is used for an electromagnetic spring clutch has been described. However, the coil assembly of the present invention It can be used not only for magnetic coupling but also for solenoids and solenoid valves.

[0025]

According to the coil assembly of the present invention, an annular groove that opens outward in the radial direction is formed, and an inner surface of one of the flanges is formed in a circumferential direction from the outer peripheral surface toward the bottom of the annular groove. A coil holding portion in which an extended recess is formed, and a pair of terminal press-in chambers are formed on the front side while projecting radially outward from an outer peripheral surface of the flange portion including a portion in which the recess is formed. A coil bobbin provided with a terminal accommodating portion formed with a pair of guide portions projecting at intervals on the back side, and a slit cut from the upper wall to the opposing side wall are formed and held in the terminal press-in chamber. A pair of a U-shaped crimped portion and a rod-shaped pin terminal portion extending integrally from one side wall of the crimped portion on the center line of the slit and protruding outward in the radial direction of the terminal accommodating portion are provided integrally. Through the terminal and the recess An electromagnetic coil wound around the groove and having a winding start end and a winding end end passing between guide portions of the terminal accommodating portion and electrically connected to the pin terminal portion; and a slit of the crimping portion. And a pair of lead wires pulled out from the terminal accommodating portion in the projecting direction of the pin terminal portion, so that the winding operation of the electromagnetic coil and the electrical connection between the lead wire and the terminal are performed. The operation can be simplified, the productivity can be improved, and an inexpensive coil assembly can be provided.

Further, the coil assembly of the present invention is provided with a terminal having a rod-shaped pin terminal portion extending from one side wall of the crimping portion on the center line of the slit, and each end of the electromagnetic coil is connected to the pin terminal portion. Since the electrical connection portion of the coil bobbin and the lead wire drawn from the terminal accommodating portion overlap each other, the terminal accommodating portion of the coil bobbin can be downsized.

The coil assembly according to the present invention also includes a cylindrical portion fitted on the outer peripheral surface of the coil holding portion of the coil bobbin, and a terminal housing for the coil bobbin protruding radially outward from one opening side of the cylindrical portion. A coil cover provided with an overhang portion covered on the back side of the portion, and a terminal cover fitted on the front side of the terminal accommodating portion of the coil bobbin and fitted into the opening of the overhang portion of the coil cover. The coil cover and the terminal cover cover the entire coil bobbin because the lead wire is sandwiched between the opening formed in the projecting portion of the coil cover and the groove formed in the opening of the terminal cover. Insulation protection of electromagnetic coils and electrical connection parts can be performed. Also, since the lead wire is fixed in cooperation with the groove formed in the opening of the overhang portion of the coil cover and the groove formed in the opening of the terminal cover, the conductive core wire of the lead wire and the terminal are connected by a light pulling force. It is possible to provide a coil assembly excellent in quality without breaking the connection portion with the coil assembly.

Still further, according to the coil assembly of the present invention, the terminal cover has a pressing portion for pressing the lead wire to the deepest side of the slit of the crimping portion, and a terminal engaging groove is provided at each of the four corners of the terminal press-fitting chamber. The protrusion formed on each side wall of the crimping portion of the terminal bites into the wall surface of the terminal engagement groove, so that the crimping portion of the lead wire and the terminal vibrate due to external vibration, and the electrical It is possible to provide a coil assembly excellent in quality without breaking the connection portion.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electromagnetic spring clutch in which a coil assembly is incorporated.

FIG. 2 is a sectional view taken along line AA of FIG. 3, showing only the exciting device shown in FIG. 1;

FIG. 3 is a front view of the exciter with a terminal cover removed, and is a left side view of FIG. 2;

FIG. 4 shows only the coil bobbin of FIG. 2;
FIG. 6 is a sectional view taken along line BB of FIG. 5.

5 is a front view of the coil bobbin, and is a left side view of FIG.

6 is a sectional view of the coil bobbin, and is a sectional view taken along line CC of FIG. 4;

FIG. 7 is a side view of a coil cover which is a right side surface of FIG. 8;

8 is a left side view of FIG. 7 and a front view of the coil cover.

FIG. 9 is a rear view of a terminal cover serving as a right side surface of FIG. 10;

FIG. 10 is a sectional view taken along line DD of FIG. 9;

FIG. 11 is a side view as seen in the direction of arrow E in FIG. 9;

12 (a) is a plan view, FIG. 12 (b) is a right side view, and FIG. 12 (c) is a front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 ... Coil bobbin 14 ... Electromagnetic coil 15 ... Coil holding part 16 ... Terminal 16b ... Crimping part 16d ... Pin terminal part 17 ... Terminal accommodating part 19 ... Coil cover 20 ... Extension part 21 ... Terminal cover

Claims (4)

(57) [Claims] An annular groove that opens radially outward is formed, and a concave portion that extends in a circumferential direction from an outer peripheral surface toward a bottom of the annular groove is formed on an inner surface of one flange portion. A coil holding portion and a portion protruding radially outward from an outer peripheral surface of the flange portion including a portion where the concave portion is formed, and a pair of terminal press-in chambers are formed on the front side and spaced apart on the rear side. A coil bobbin provided with a terminal accommodating portion having a pair of projecting guide portions formed thereon, and a U-shaped crimp portion formed with a slit cut from an upper wall to an opposing side wall and held in the terminal press-fitting chamber A pair of terminals provided integrally with a rod-shaped pin terminal portion extending from one side wall of the crimping portion on the center line of the slit and protruding radially outward of the terminal accommodating portion, and passing through the recessed portion. While being wound around the annular groove, The winding start end and the winding end end pass between the guide portions of the terminal accommodating portion and the electromagnetic coil electrically connected to the pin terminal portion, and are crimped to the slit of the crimping portion and from the terminal accommodating portion. A coil assembly comprising: a pair of lead wires drawn out in a protruding direction of the pin terminal portion. 2. The coil assembly according to claim 1, wherein the cylindrical portion is fitted on the outer peripheral surface of the coil holding portion of the coil bobbin, and projects radially outward from one opening side of the cylindrical portion. A coil cover provided with an overhang portion that covers the back side of the terminal receiving portion of the coil bobbin; and a coil cover that is fitted over the front side of the terminal receiving portion of the coil bobbin and fitted into an opening of the overhang portion of the coil cover. A coil cover, wherein the lead wire is sandwiched between an opening of the projecting portion of the coil cover and a groove formed in the opening of the terminal cover. 3. The coil assembly according to claim 2, wherein the terminal cover is formed with a pressing portion for pressing the lead wire to the deepest side of the slit of the crimping portion. Coil assembly. 4. The coil assembly according to claim 1, wherein terminal engaging grooves are formed at four corners of the terminal press-fitting chamber, and a crimping portion of the terminal is formed on a wall surface of the terminal engaging groove. A projection formed on each side wall of the coil assembly.