JPH0530568U - Electromagnetic clutch - Google Patents

Abstract

(57) [Abstract] [Purpose] In an electromagnetic clutch in which a pair of terminals are inserted and fixed in the holding frame of a coil bobbin and an insulator is fixed, the terminal wire connection does not protrude in the axial direction. Shorten the clutch axial dimension. [Structure] The coil bobbin 7 has a shape including a winding frame portion 7a around which the electromagnetic coil 6 is wound, and a holding frame 7c to which an insulator 9 into which a pair of terminals 10 are inserted and fixed is fitted and fixed. In addition, the terminal 10 is connected to the electromagnetic coil 6
The wire is connected to the winding start end and the winding end end and extends in different tangential directions. An outer flange 8d as an insulating plate formed on the coil cover 8 is interposed between the connection portion of these terminals 10 and the end surface of the outer pole 5c of the field core 5. Therefore, since the connecting portion of the terminal 10 does not project in the axial direction, the dimension of the electromagnetic clutch in the axial direction can be shortened.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to an electromagnetic clutch using a low torque incorporated in a paper feeding mechanism of a copying machine, and in particular, an improvement of an electromagnetic clutch in which a terminal bobbin is integrally held on a coil bobbin around which an electromagnetic coil is wound. It is about.

[0002]

[Prior Art]

 A conventional electromagnetic clutch has a field core that has a coil bobbin with an electromagnetic coil wound inside an annular groove that opens in the axial direction.The lead wire connected to the winding start and end of the electromagnetic coil is insulated. It was pulled out from the inside of the annular groove to the outside of the field core through the bush. With such a configuration, the length of the lead wire differs depending on the mounting position of the electromagnetic clutch, and there is an uneconomical aspect in that it is necessary to manufacture various types of electromagnetic clutches that differ only in the length of the lead wire. .. In order to solve such a problem, an electromagnetic clutch in which a terminal assembly is integrally held on a coil bobbin has been developed for the purpose of versatility of a field core (see Japanese Patent Application No. 2-17368 and drawings). ).

In this electromagnetic clutch, a disc-shaped rotor is fitted and fixed substantially at the center in the axial direction of a sleeve having one D-shaped hole, and an electromagnetic coil is internally provided on the outer peripheral surface of the sleeve on the D-shaped hole side. The sleeve is rotatably fitted to the other side of the sleeve, and an armature assembly with a structure in which the armature is elastically supported by the armature hub via a leaf spring is rotatably fitted to the outer peripheral surface of the other side. The electromagnetic clutch having such a structure is mounted in the paper feed mechanism by inserting the driven shaft of the paper feed mechanism of the copying machine into the sleeve and stopping the field core from rotating. Therefore, the armature hub that meshes with the drive-side gear is normally spinning, so if the electromagnetic coil is energized and the armature is magnetically attracted to the rotor, the drive-side rotation is driven by the sleeve and the D-shaped hole. Transmitted to the shaft.

In the field core of the electromagnetic clutch having the above-described structure and operation, the winding part of the electromagnetic coil is formed integrally with one side of the winding part of the electromagnetic coil in which the annular groove opening to the outside in the radial direction is formed. A coil bobbin having a holding frame for the terminal assembly is installed therein. A terminal assembly made of a bottomed rectangular tubular insulator into which a pair of L-shaped bent terminals are inserted and fixed is fixed to the holding frame of the coil bobbin. The winding start and end ends of the electromagnetic coil wound around the winding frame of the coil bobbin are pulled off and soldered to the wire connections of the terminal extending from the outside of the bottom of the insulator in parallel to the axial direction. .. The coil bobbin having such a structure is incorporated in the annular groove of the field core with the holding frame protruding outward from the groove at the bottom of the field core.

[0005]

[Problems to be solved by the device]

 In the conventional electromagnetic clutch in which the terminal assembly is integrally held on the coil bobbin, the wire connection part of the pair of terminals protrudes from the bottom of the field core in the axial direction. At that time, the connection part of this terminal sometimes obstructed the installation. An object of the present invention is to shorten the dimension of the electromagnetic clutch in the axial direction by adopting a structure in which the connection portion of the terminal does not project in the axial direction.

[0006]

[Means for Solving the Problems]

 In order to achieve such an object, according to the present invention, the connecting portions of a pair of terminals, which extend from the outside of the bottom of the insulator in parallel to the axial direction, are rotated 90 degrees in different directions to project in the tangential direction. It was configured to do. Further, with such a configuration, the terminal wire connection portion faces the end of the outer pole of the field core with a gap in the axial direction, so an insulating plate was interposed between the wire connection portion and the outer pole.

Furthermore, a groove for accommodating the terminal wire connection portion is provided in the side plate of the winding frame portion of the coil bobbin, and a notch is formed at the root of the outer piece, which is the deepest part of the accommodation groove, to form the outer piece. In addition to being elastically deformable, by integrally forming a holding frame on this outer piece, the insulator in which the terminal with the connecting portion protruding in the tangential direction is inserted is fixed to the holding frame, and the connecting portion of the terminal is fixed. After connecting the winding start and end ends of the electromagnetic coil, and then raising this holding frame in the radial direction, the connection part of the terminal is configured inside the storage groove.

[0008]

[Action]

 In the electromagnetic clutch, the power source and the electromagnetic coil are connected by fitting and fixing the connector, which is connected to the power source side by the lead wire, to the insulator. By energizing the electromagnetic coil and magnetically attracting the armature to the rotor, the rotation on the armature assembly side is transmitted to the driven shaft in the sleeve to which the rotor is fitted and fixed. When the electromagnetic coil is de-energized, the armature separates from the rotor and the armature assembly spins idle on the sleeve.

[0009]

【Example】

 1 to 8 show an electromagnetic clutch according to an embodiment of the present invention, FIG. 1 is a sectional view, FIG. 2 is a rear view, FIG. 3 is a rear view of a coil bobbin, FIG. 4 is a side view of the coil bobbin, and FIG. FIG. 6 is a rear view of the coil cover, FIG. 6 is a rear view of the outer pole of the field core, FIG. 7 is a rear view of an essential part with an insulating cover attached, and FIG. 8 is a bottom view of the essential part of FIG. In these drawings, an electromagnetic clutch 1 is incorporated in a paper feeding mechanism of a copying machine and mounted on a driven shaft 2. The driven shaft 2 has a D-shaped end cut, and the D-shaped hole 3a of the disk-shaped sleeve 3 is fitted to the cut surface 2a so that the sleeve 3 and the driven shaft 2 can rotate integrally.

A disk-shaped rotor 4 is fitted in a substantially central portion in the axial direction of the sleeve 3, and a knurled minute uneven surface (not shown) of the sleeve 3 is provided with a central hole of the rotor 4. The sleeve 3 and the rotor 4 are fixed by press-fitting. A field core 5 formed by sintering and forging an oil-containing sintered alloy material is fitted on the outer peripheral surface of the sleeve 3 on the D-shaped hole 3a side. The field core 5 is a disk-shaped substrate 5a. And an inner pole member 5b which is an inner cylindrical member, which has an L-shaped cross section, and an outer pole member 5c which is an outer cylindrical member having an open end press-fitted to the outer peripheral surface of the substrate 5a. An annular groove 5d is formed which is open to.

A coil bobbin 7 around which an electromagnetic coil 6 is wound is provided inside the annular groove 5 d of the field core 5. The coil bobbin 7 has a shape including a winding frame portion 7a of the electromagnetic coil 6 and a holding frame 7c integrally formed with one disc-shaped side plate 7b of the winding frame portion 7a. The holding frame 7c is a substrate of the field core 5. It projects outwardly from a notch 5e formed in 5a. The side plate 7b of the coil bobbin 7 is formed with a groove 7d through which the winding start winding end portions 6a and 6b of the electromagnetic coil 6 pass (only the winding start side is shown, see FIGS. 3 and 4). The outer peripheral surface of the electromagnetic coil 6 wound through the coil is covered with a cylindrical coil cover 8 made of a resin material similar to the coil bobbin 7.

As shown in the sectional view of FIG. 1 and the rear view of FIG. 5, the cylindrical coil cover 8 has a cylindrical portion 8a covering the electromagnetic coil 6, an annular inner flange 8b, and a side plate 7b side of the coil bobbin 7 that is circular. The outer flange 8c is formed in a position that divides the circumferential direction into four equal parts, and the downwardly projecting flange of the outer flange 8c is an arc piece 6d serving as an insulating plate. On the other hand, a pair of engagement melons 7e is formed on the holding frame 7c of the coil bobbin 7, and the insulating melon 7e is made elastic by fitting the insulator 9 formed in the shape of a cylinder with a bottomed corner into the holding frame 7c. It returns and is engaged with the engaging groove 9a of the insulator 9.

The terminal assembly has a structure in which a pair of terminals 10 bent into an L-shape are inserted and fixed to an insulator 9. The terminal assembly passes through the groove 7f (see FIG. 4) of the holding frame 7c to the outside. The exposed connection portion 10a (see FIG. 3) of the terminal 10 extends in different circumferential tangential directions with respect to the side plate 7b of the coil bobbin 7. Therefore, in the coil winding work of the electromagnetic coil 6 by the winding machine, first, the winding start end portion 6a of the electromagnetic coil 6 is twisted to the connection portion 10a of the one terminal 10, and the winding frame is passed through the groove 7d of the side plate 7c of the coil bobbin 7. Wrap around part 7a. When the predetermined number of turns is reached, the end 6b of the end of the winding of the electromagnetic coil 6 is passed through a groove (not shown) in the side plate 7b, and is twisted to the connecting portion 10a of the other terminal 10.

The outer peripheral surface of the electromagnetic coil 6 wound around the coil bobbin 7 in this manner is temporarily fixed by an insulating tape (not shown), and the winding start end portions 6a and 6b are terminally wound. It is soldered to the connection portion 10a of 10. Next, the coil cover 8 that covers the electromagnetic coil 6 is fitted to the outer peripheral surface of the coil bobbin 7, and then the coil bobbin 7 is press-fitted to the inner pole 5b of the field core 5. After press-fitting the coil bobbin 7, the outer pole 5c is aligned while aligning the groove 5f formed in the outer pole 5c so that the outer flange 8c of the coil cover 8 and the outer flange 8d as an insulating plate are engaged. Is press-fitted and fixed to the outer peripheral surface of the substrate 5a. The field core 5 assembled through the above steps is fitted on the sleeve 3 with the thrust washer 11 sandwiched between the inner pole 5b and the rotor 4, and is fitted with the ring 12 by press fitting. It will be retained.

After mounting the field core 5 on the sleeve 3, the armature assembly 13 is fitted onto the sleeve 3 and is prevented from coming off by the ring 14. The armature assembly 13 has a plate spring 17 elastically supporting an armature 16 facing the rotor 4 with a predetermined gap S on an armature hub 15 having a gear 15a meshing with a drive side gear (not shown). There is. Then, the tip end of the cylindrical boss 15b of the armature hub 15 is brought into contact with the side surface of the rotor 4 to obtain the gap S 2.

In the electromagnetic clutch 1 having such a structure, the wire connecting portion 10a exposed to the outside from the groove 7f of the holding frame 7c of the terminal 10 inserted and fixed to the insulator 9 extends in different tangential directions. It is connected to the winding start end portions 6a and 6b of the coil 6, and between the connection portion 10a of the terminal 10 and the end of the outer pole 5c of the field core 5, a coil cover 8 as an insulating plate is provided. Since the outer flange 8d is interposed, the dimension of the electromagnetic clutch 1 in the axial direction is shorter than that of the conventional electromagnetic clutch, and the electrical structure does not occur due to such a structure. The connecting portion 10a of the terminal 10 is not exposed to the outside but is covered with the resin material cover 18 as shown in FIGS. 7 and 8. The connecting portion 10a of the terminal 10 is embedded in the resin. It may be a structure. The insulating plate 8d described above may be formed on the side plate 7b of the coil bobbin 7.

In the electromagnetic clutch 1 described above, the electromagnetic coil 6 can be energized by connecting a connector (not shown) connected to the insulator 9 via a power source and a lead wire. Also, since the electromagnetic core 1 is mounted on the driven shaft 2 with the field core 5 being stopped like the conventional electromagnetic clutch, if the electromagnetic coil 6 is energized and the armature 16 is magnetically attracted to the rotor 4, it is driven. The rotation of the armature hub 15, which rotates by meshing with a gear (not shown) on the side, is transmitted to the driven shaft 2. Here, if the electromagnetic coil 6 is de-energized, the armature 16 is separated from the rotor 4 by the elastic return of the leaf spring 17, so that the rotation transmission to the driven shaft 2 is cut off.

9 to 15 show an electromagnetic clutch according to another embodiment of the present invention. FIG. 9 is a sectional view, FIG. 10 is a rear view, and FIG. 11 is a sectional view of a coil bobbin. 12 is a rear view of the lower half of FIG. 11, FIG. 13 is a side view of FIG. 12, FIG. 14 is a side view of a holding frame of a coil bobbin, and FIG. 15 is a side view of an insulator. It should be noted that the members having the same structure and action as those of the previous embodiment are designated by the same reference numerals and the description thereof is omitted.

Like the electromagnetic clutch 1, the electromagnetic clutch 19 is mounted in the paper feeding mechanism of the copying machine, and the wire connection portion 21 a of the pair of terminals 21 inserted and fixed to the insulator 20 has a coil bobbin 22. They are different in that they are formed in the storage groove 22c formed in the side plate 22b. The coil bobbin 22 has a winding frame portion 22a around which the electromagnetic coil 6 is wound, and a storage groove 22c formed in one annular side plate 22b of the winding frame portion 22a, and an outer piece 22d of the storage groove 22c. The holding frame 23 connected by is integrally formed. Further, a cutout portion 22e is formed at the root of the outer piece 22d, which is the deepest portion of the storage groove 22c, and the cutout portion 22e is configured to be elastically deformable, so that the holding frame 23 is virtually shown in FIG. It can pivot axially as indicated by the lines.

The holding frame 23 of the coil bobbin 22 has grooves 23b and 23c into which the pair of engagement melons 23a and the connection portion 21a of the terminal 21 are inserted, and grooves 23d orthogonal to these grooves 23b and 23c on the left and right side surfaces. Are formed respectively (see FIG. 14). The insulator 20 is formed with an engagement groove 20a with which the engagement melon 23a of the holding frame 23 is engaged and projections 20b and 20c fitted into the grooves 23b and 23c of the holding frame 23 (see FIG. 15). ). Therefore, a pair of terminals 21 are inserted and fixed to the insulator 20 so that the wire connecting portions 21a face in opposite directions, and the wire connecting portion 21a is fitted into the holding frame 23 through the grooves 23b and 23c of the holding frame 23. When fitted together, the protrusions 20b, 20c of the insulator 20 are fitted into 23b, 23c of the holding frame 23, and the engagement melon 23a of the holding frame 23 is engaged with the engagement groove 20a of the insulator 20. Then, in the coil bobbin 22, the electromagnetic coil 6 is wound around the winding frame portion 22a similarly to the coil bobbin 7 of the electromagnetic clutch 1 while the holding frame 23 is rotated in the state of the phantom line in FIG. The winding start end and the winding end end of the electromagnetic coil 6 are entangled and soldered to the connection portion 21a. The groove of the coil bobbin 22 (for example, the groove 7d in FIGS. 3 and 4) through which the winding start and winding end portions of the electromagnetic coil 6 are passed is omitted in the drawing.

When the coil bobbin 22 around which the electromagnetic coil 6 is wound is press-fitted into the cylindrical inner pole 24 b of the field core 24, the tapered side surface of the outer piece 23 is formed into the tapered inner surface of the substrate 24 a of the field core 24. The holding frame 23 is raised in the radial direction because the holding frame 23 is brought into contact with 24c. When the end portion of the cylindrical outer pole 24d of the field core 24 is press-fitted onto the outer periphery of the substrate 24a, the raised holding frame 23 has an engaging projection 24e (Fig. 10) is engaged with the groove 23d of the holding frame 23. When the holding frame 23 is raised, the wire connection portion 21a of the terminal 21 is housed in the housing groove 22c formed in the side plate 22b of the coil bobbin 22 and insulated from the outside. Note that the other configurations and operations are the same as those of the electromagnetic clutch 1, and thus description thereof will be omitted.

[0022]

【effect】

 As described in detail above, in the electromagnetic clutch of the present invention, the wire connecting portions of the pair of terminals inserted and fixed in the insulator are oriented in different tangential directions, so that the axial dimension of the electromagnetic clutch becomes short. , It is possible to reduce the installation space of the electromagnetic clutch occupied by the paper feed mechanism of the copying machine. In addition, the wire connection part of the terminal is axially opposed to the outer extreme part of the field core through the insulating plate, and the insulating plate is formed integrally with the coil cover and coil bobbin formed in the annular groove of the field core. Therefore, it is possible to insulate the terminal connection part with sufficient quality without increasing the number of parts and the assembly process.

Furthermore, since the holding frame integrally formed with the coil bobbin is made rotatable by elastic deformation of the notch, the notch is formed at the base of the outer plate of the storage groove formed in the side plate of the coil bobbin. By raising the holding frame in the radial direction, the wire connection part of the terminal is housed in the housing groove, and the axial dimension of the electromagnetic clutch can be further shortened.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an electromagnetic clutch that is an embodiment of the present invention.

FIG. 2 is a rear view of the electromagnetic clutch.

FIG. 3 is a rear view of the coil bobbin.

FIG. 4 is a side view of FIG.

FIG. 5 is a rear view of the coil cover.

FIG. 6 is a rear view of the outer pole of the field core.

FIG. 7 is a rear view of an essential part in which a cover is attached to a connection part.

FIG. 8 is a bottom view of FIG.

FIG. 9 is a cross-sectional view of an electromagnetic clutch that is another embodiment of the present invention.

FIG. 10 is a rear view of the electromagnetic clutch.

FIG. 11 is a sectional view of a coil bobbin.

FIG. 12 is a rear view of the lower half of FIG.

FIG. 13 is a side view of the main part of FIG.

FIG. 14 is a side view of a holding frame.

FIG. 15 is a side view of an insulator.

[Explanation of symbols]

 5 Field core 6 Electromagnetic coil 7 Coil bobbin 7a Reel 7b Side plate 7c Holding frame 7e Engaging gourd 8 Coil cover 9 Insulator 10 Terminal 20 Insulator 21 Terminal 22 Coil bobbin 22a Reel part 22b Side plate 22c Storage groove 22d Outside piece 22d Part 23 Holding frame

Claims (3)

[Scope of utility model registration request] 1. A coil bobbin having a winding frame portion around which an electromagnetic coil is wound and a holding frame integrally formed on one side plate of the winding frame portion, and a cylindrical inner shape into which a center hole of the coil bobbin is press-fitted. A pole and a disc-shaped substrate in which the holding frame is formed with a groove protruding to the outside, and a field core in which one end of a cylindrical outer pole is press-fitted and fixed to the outer peripheral surface of the substrate, In an electromagnetic clutch in which a bottomed rectangular tubular insulator in which a pair of terminals bent in an L shape are inserted and fixed is held in a holding frame of the coil bobbin, the electromagnetic clutch is exposed to the outside from the bottom of the insulator. The wire connecting portions of the terminals to which the winding start and end ends of the electromagnetic coil are connected extend in different tangential directions, and an insulating plate is formed between the wire connecting portions of the terminals and the outer extreme surface of the field core. Characterized by Electromagnetic clutch. 2. The electromagnetic coil according to claim 1, wherein a cylindrical coil cover is fitted in the winding frame portion of the coil bobbin, and the insulating plate is integrally formed at an end portion of the coil cover. clutch. 3. A winding frame portion around which an electromagnetic clutch is wound, and a storage groove formed in one side plate of the winding frame portion, and a notch is formed in a root portion of an outer piece which is the deepest portion of the storage groove. A coil bobbin that forms a portion to make the outer piece elastically deformable and integrally forms a holding frame on the outer piece, a cylindrical inner pole into which the center hole of the coil bobbin is press-fitted, and the holding portion project to the outside. And a disk-shaped substrate having a groove formed therein,
A field core in which one end of a cylindrical outer pole is press-fitted and fixed is provided on the outer peripheral surface of the substrate, and a pair of terminals bent in an L shape are inserted and fixed in the holding frame of the coil bobbin. In an electromagnetic clutch in which a rectangular tubular insulator is held, tangential directions in which the wire connecting portions of the terminal, which are exposed to the outside from the bottom of the insulating material and are connected to the winding start and end ends of the electromagnetic coil, differ from each other And connecting the winding start and end ends of the electromagnetic coil to the wire connection part of the terminal, and then raising the holding frame and the outer piece in the radial direction so that the wire connection part of the terminal is inside the storage groove of the coil bobbin. An electromagnetic clutch, which is characterized in that