JP2001221258A - Armature assembly for electromagnetic coupling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small and lightweight electromagnetic coupling device by shortening the size of a boss part for a hub. SOLUTION: The tub 11 is provided with guide parts 11d and deforming parts 11e formed on tips of these guide parts 11d. An armature 12 is provided with guide grooves 12a to be engaged with the guide parts 11d and mount parts 12b protruding from its outer circumferential face. A plate spring 13 is provided with fixing parts 13a and arced deflecting parts 13c formed between adjacent fixing parts 13a. By laminating the armature 12 and the plate spring 13 on a side face of the hub 11 and deforming the deforming parts 11e of the hub 11, the fixing parts 13a of the plate spring 13 are fixed to the guide parts 11d of the hub 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature assembly for an electromagnetic coupling device, and more particularly to an armature assembly provided with an annular leaf spring for constantly biasing an armature toward a hub. .

[0002]

2. Description of the Related Art A conventional armature assembly of an electromagnetic coupling device includes a hub having a cylindrical boss portion and a disk-shaped flange portion, a hub disposed around the hub portion, and an outer peripheral portion. An armature slidably fitted in a guide portion formed in a flange portion of a hub with a guide groove formed in the surface, and a bent portion is fitted and fixed in a groove portion formed in an outer peripheral surface of a hub boss portion of the hub. An annular leaf spring is formed on the inner peripheral surface of the armature, and has an arcuate bending portion formed between adjacent bent portions, and is engaged with a protruding portion projecting radially inward from the friction surface. The leaf spring has its bent portion fitted and fixed in the groove of the boss portion of the hub, thereby restricting the movement of the leaf spring in the direction away from the inner side surface of the flange portion of the hub (actual publication 7-24666). Reference).

[0003] An armature assembly having such a structure is obtained by stacking an armature on the inner surface of a flange portion of a hub and then placing a central portion in a circumferential direction of a bending portion on a protruding portion of the armature. By fitting the bent portion of the spring into the groove of the hub, the bent portion of the leaf spring can be elastically deformed. Therefore, the armature can be constantly urged toward the flange side of the hub by the elastic return force of the leaf spring. Further, in the electromagnetic coupling device having such an armature assembly, since the guide groove of the armature is slidably fitted in the guide portion of the hub, magnetic attraction of magnetic flux generated by energizing the electromagnetic coil is achieved. When the armature is magnetically attracted to the rotor against the elastic restoring force of the leaf spring by the force, for example, the hub that rotates by meshing with the driving-side rotating member and the rotating shaft of the driven-side rotating member to which the rotor is mounted are integrated. To rotate. Further, since the magnetic flux disappears when the power supply to the electromagnetic coil is cut off, the armature is separated from the rotor by the elastic return force of the leaf spring. Then, only the armature assembly idles.

[0004]

Although such an armature assembly is most suitable as an armature assembly of an electromagnetic coupling device for use with a light load, a bent portion of a leaf spring is formed in a groove formed in a boss portion of a hub. It is a structure fitted and fixed to
With such a structure, the boss portion of the hub protrudes long in the axial direction. SUMMARY OF THE INVENTION An object of the present invention is to provide an armature assembly of an electromagnetic coupling device that can reduce the size of a boss portion of a hub.

[0005]

An armature assembly according to a first aspect of the present invention has a plurality of guide portions (11d, 14d, 14d, 14d,
17e) and the guide portion (1) formed on the peripheral surface at an interval in the circumferential direction with the hub (11, 14, 17) provided with the guide portion (1).
1d, 14d, 17e) and a plurality of guide grooves (12a, 15a, 18a) slidably fitted to the guide grooves (12a, 15a, 18a) circumferentially adjacent to each other. A plurality of mounting portions (12b, 15b, 18b) protruding radially from the surface are provided, and the hub (1
Armatures (12, 15, 18) superposed on the inner surfaces of the hubs (11, 14, 1).
7) A plurality of fixing portions (13a, 16a, 1) which are overlapped and fixed on the distal end surfaces of the guide portions (11d, 14d, 17e).
9a) and the fixing portions (13a, 1
6a, 19a) and a central portion in the circumferential direction is formed between the mounting portion (12) of the armature (12, 15, 18).
b, 15b, 18b), provided with annular leaf springs (13, 16, 19) provided with a plurality of bending portions (13c, 16c, 19c) superimposed on the mounting surface of the armature (1).
2, 15, 18) mounting part (12b, 15b, 18b)
The mounting surface of the hub (1) is closer to the distal end surface of the guide portion (11d, 14d, 17e) of the hub (11, 14, 17).
1, 14, and 17), and the flexible portions (13 c, 16 c, 1) of the leaf springs (13, 16, 19)
9c) is characterized by being elastically deformed.

According to a first aspect of the present invention, there is provided an armature assembly comprising: a guide groove slidably fitted in a guide portion of a hub; and a guide groove formed on one of an outer peripheral surface and an inner peripheral surface of the armature. The mounting portions on which the bending portions are mounted are alternately provided at intervals in the circumferential direction, and an annular leaf spring is overlapped on the distal end surface of the guide portion of the hub and the mounting surface of the mounting portion of the armature,
By fixing the fixing portion of the leaf spring to the distal end surface of the guide portion, the bending portion of the leaf spring is elastically deformed. Further, the armature is constantly urged toward the hub by the elastic return force of the leaf spring.

The armature assembly according to the second invention is the same as the armature assembly according to the first invention, except that the hub (11, 14,
The deformed portions (11e, 14e, 1e) projecting in the axial direction are provided on the distal end surfaces of the guide portions (11d, 14d, 17e).
7f), and the hubs (11, 1 and 1) are fixed to the fixing portions (13a, 16a and 19a) of the leaf springs (13, 16, and 19).
4 and 17) are provided with through holes (13b, 16b, 19b) into which the deformed portions (11e, 14e, 17f) are inserted, and the fixing portions (13, 13) of the leaf springs (13, 16, 19) are provided.
a, 16a, 19a) to the hub (11, 14, 17).
Of the leaf springs (13, 16, 19) against the distal end surfaces of the guide portions (11d, 14d, 17e).
c, 16c, and 19c) in a state where the hubs (11, 14, 17) are elastically deformed.
7f) is modified.

In the armature assembly of the second invention, the fixed portion of the leaf spring is fixed to the distal end surface of the guide portion of the hub by deforming the deformed portion of the hub by ultrasonic welding or caulking. An elastic return force for urging the armature against the inner surface of the hub is applied to the bent portion of the leaf spring.

An armature assembly according to a third aspect of the present invention comprises:
In the armature assembly according to the second aspect of the invention, a circumferential side surface is formed on the distal end surface of the guide portion (14d) of the hub (14) so as to be flush with the guide surface of the guide portion (14d) and protrudes in the axial direction. Armature (1
The overfilling portion (14f) in which the guide groove (15a) of 5) is slidably fitted is provided.

In the armature assembly according to the third aspect of the present invention, the contact area between the guide surface of the guide portion of the hub and the wall surface of the guide groove of the armature increases, and the surface pressure acting on the guide portion of the hub decreases.

An armature assembly according to a fourth aspect of the present invention comprises:
2 In the armature assembly of the invention, the leaf spring (19)
The guide portion (17) of the hub (17) is fixed to the fixing portion (19a) of the hub (17).
e) guide surface and armature (18) guide groove (1)
A bent portion (19d) interposed between the wall and the wall of (8a) is provided.

In the armature assembly according to the fourth aspect of the present invention, since the wall surface of the guide groove of the armature made of a metal material does not directly collide with the guide surface of the guide portion of the hub, the armature assembly is integrally formed of a synthetic resin material or the like. The durability of the guide portion of the hub is improved.

[0013]

1 to 5 show an electromagnetic coupling device provided with an armature assembly shown as an embodiment of the present invention. FIG. 1 is a sectional view of the electromagnetic coupling device, and FIG. It is a uniaxial member, (a) is the left view of (b), (b) is sectional drawing, (c) is the right view of (b). FIG. 3 shows the second
It is a shaft member, (a) is a left view of (b), (b) is a front view. FIG. 4 is a plan view of the rotor, and FIG. 5 is an exploded perspective view of the armature assembly. The electromagnetic coupling device shown in these drawings is a light-load use clutch incorporated in a paper feed mechanism of a copying machine.

The electromagnetic coupling device comprises a hollow shaft 1 into which a solid shaft of a driven-side rotating member is inserted, a rotor 5 rotatably connected to the hollow shaft 1, and a yoke 7 supported by the hollow shaft 1. And an armature assembly supported by the hollow shaft 1.

The hollow shaft 1 is composed of a first shaft member 2 molded of a synthetic resin material and a second shaft member 4 molded of a synthetic resin material. The flanged cylindrical first shaft member 2 has a cylindrical yoke support 2a on which a yoke 7 described later is supported.
Are formed. At one end of the yoke support 2a, a yoke engaging portion 2b provided by an annular flange projecting outward in the radial direction is formed. Moreover,
The other end of the yoke support 2a has a rotor 5 to be described later.
Is formed with the rotor fitting portion 2c into which the. The rotor fitting portion 2c is formed with a non-circular outer peripheral surface having a flat surface and an arc surface with an arc-shaped notch 2d formed at a position dividing the outer peripheral surface into four equal parts. By forming the notch 2d, the wall surface of the rotor fitting portion 2c on the yoke support portion 2a side is provided as a yoke-side contact surface 2e which abuts against the rotor 5.

The inner circumferential surface of the first shaft member 2 has a circumferential direction of 3
Locking grooves 3 are formed at equally dividing positions. Each locking groove 3
Penetrates in the axial direction from one end of the yoke support portion 2a to the other end thereof.
Elastic piece 4c is inserted. Also, the yoke engaging portion 2
A substantially rectangular shaft engaging portion 3a protruding inward in the radial direction is formed on the inner peripheral surface on the side b. Furthermore, each locking groove 3
The end on the yoke engaging portion 2b side is widened radially outward, and a concave portion 3b having an open side surface is formed.
An engagement claw 4d of the second shaft member 4 described later is engaged with the recess 3b.

Second shaft member 4 formed in a cylindrical shape with a flange
Is formed with a cylindrical hub support 4a on which a hub 11 described later is rotatably supported. Also, the hub support 4
A hub engaging portion 4b formed by an annular flange protruding outward in the radial direction is provided at one end of a.
Further, the second shaft member 4 is formed with three elastic pieces 4c extending in the axial direction from the other end of the hub support 4a. At the tip of each elastic piece 4c, an engaging claw 4d that protrudes outward in the radial direction and engages with the concave portion 3b of the first shaft member 2 is formed.

Each elastic piece 4c is formed with an outer arc surface having an outer diameter smaller than the outer diameter of the hub support 4a.
In addition, a side surface of the hub support portion 4a that is radially outward from the base end of the elastic piece 4c is provided as a hub-side contact surface 4e that contacts the rotor 5. Further, the outer arc surface of each elastic piece 4c inserted into the locking groove 3 of the first shaft member 2 contacts the arc-shaped groove bottom of the locking groove 3 in a natural state where the elastic piece 4c is elastically restored. The engaging claw 4d is in contact with the recess 3b.
Is engaged. The state of engagement between the locking groove 3 and the elastic piece 4c and the state of engagement between the engaging claw 4d and the recess 3b are determined by the first shaft member 2
And the second shaft member 4 is securely held by inserting the solid shaft of the driven side rotating member.

First shaft member 2 molded in such a shape
The second shaft member 4 and the second shaft member 4 are assembled by elastically deforming and inserting the elastic piece 4c of the second shaft member 4 into the locking groove 3 of the first shaft member 2 as described above. Also, the first shaft member 2
By assembling the second shaft member 4 and the second shaft member 4, the rotor fitting portion 2c of the first shaft member 2 is fitted into the shaft hole of the disk portion 5a of the rotor 5, and the periphery of the shaft hole of the rotor 5 is It is sandwiched between the yoke-side contact surface 2e of the first shaft member 2 and the hub-side contact surface 4e of the second shaft member 4.

The rotor 5 is formed by bending a steel plate into a cup shape and then punching out a central portion with a press.
A circular plate portion 5a, a radially outer cylindrical portion 5b, and a non-circular shaft hole are provided. A peripheral wall fitted to the outer peripheral surface of the rotor fitting portion 2c of the first shaft member 2 is formed in the shaft hole of the rotor 5, and the first shaft member 2 and the rotor 5 are integrally rotatable in the circumferential direction. Are in mesh. Further, the rotor 5 of the embodiment is
An annular groove is formed on the friction surface side, and an arc-shaped long hole 5c is formed in the annular groove. The elongated hole 5c is a magnetically demagnetized portion for diverting magnetic flux to the armature 12, which will be described later. A radially outer side of the elongated hole 5c of the rotor 5 is provided as a cylindrical outer pole portion. The inner side in the radial direction is provided as a disk-shaped inner pole portion.

The yoke supporting portion 2a of the first shaft member 2 supports a yoke 7 in which an electromagnetic coil 6 is accommodated in an annular groove 7a. The yoke 7 is provided with an inner annular member 7b (inner pole portion) having a substantially L-shaped cross section and an outer cylindrical member 7c (outer pole portion) formed in a cylindrical shape. Further, the inner annular member 7b of the yoke 7 is provided with an annular magnetic path member 10 fitted to the outer peripheral surface of the tip thereof, and the outer peripheral surface of the magnetic path member 10 and the inner cylindrical member 7c. An annular demagnetized space S is formed between the outer peripheral surface and the peripheral surface to shut off leakage magnetism. In the embodiment, the electromagnetic coil 6
The coil cover 9 is fitted on the outside of the coil bobbin 8 on which the is wound.

The front side of the yoke 7 having such a structure is inserted inside the cylindrical portion 5b of the rotor 5, and the outer cylindrical portion 7c and the cylindrical portion 5b of the rotor 5 are radially opposed to each other. Also, the tip of the inner annular member 7b and the magnetic path member 10
Face the disk portion 5a of the rotor 5 in the axial direction.
In the embodiment, a sheet-shaped thrust bearing member is interposed between the side surface of the disk portion 5a of the rotor 5 and the side surfaces of the inner annular member 7b of the yoke 7 and the magnetic path member 10.

The hub support 4a of the second shaft member 4 rotatably supports a hub 11 made of a synthetic resin material having teeth 11a formed on its outer peripheral surface for meshing with the gears of the drive-side rotating member. The hub 11 is interposed between the hub engaging portion 4b and the rotor 5. The hub 11 has a boss 11b whose tip is opposed to a side surface on the friction surface side of the rotor 5, and a tooth 11
A disk-shaped flange portion 11c on which a is formed is formed. A prismatic guide 11d is formed on the inner surface of the flange 11c on the rotor 5 side. The guide portion 11d is formed at a position obtained by dividing the circumferential direction of the inner surface near the teeth 11a into three equal parts, and protrudes toward the rotor 5 (axial direction). Further, a columnar deformed portion 11e protruding in the axial direction is formed at the center of the distal end surface of each guide member 11d.

An armature 12 manufactured in a disk shape by pressing a rolled steel plate is supported on the hub 11 movably in the axial direction. Armature 12
The guide groove 12a slidably fitted in the guide portion 11d of the hub 11 is formed at a position obtained by dividing the circumferential direction of the outer peripheral surface into three equal parts. The armature 12 has a mounting portion 1 that protrudes radially outward from the friction surface at a position obtained by dividing the circumferential direction of the outer peripheral surface different from the position of the guide groove 12a into three equal parts.
2b is formed. The side surface (mounting surface) of the mounting portion 12b on the rotor 5 side is formed lower than the friction surface of the armature 12 facing the friction surface of the rotor 5, and the mounting surface of the mounting portion 12b is The guide portion 1 of the hub 11 is placed in a state where the anti-friction surface side of the
The hub 11 is provided so as to be slightly higher than the distal end face toward the rotor 5 side, and is separated from the inner side face of the hub 11.

The leaf spring 13 is manufactured from a thin metal plate.
A rectangular fixing part 13a is formed at a position obtained by dividing the circumferential direction into three equal parts, and an arc-shaped bending part 13c is formed between adjacent fixing parts 13a, and the fixing part 13a is formed on the inner periphery of the bending part 13c. The shape protrudes radially inward from the surface.
The deformed portion 1 of the hub 11 is located at the center of each fixed portion 13a.
A through hole 13b into which 1e is inserted is formed.

An armature assembly is constituted by the hub 11, the armature 12, and the leaf spring 13 having such a shape. In the assembly of the armature assembly, the guide groove 12a of the armature 12 is fitted into the guide portion 11d of the hub 11, and the anti-friction surface side of the armature 12 is overlapped with the inner surface of the flange portion 11c of the hub 11. Next, the leaf spring 13
The deformed portion 11e of the hub 11 is inserted into the through hole 13b, and the central portion of the bent portion 13c of the leaf spring 13 is mounted on the mounting surface of the mounting portion 12b of the armature 12. Further, against the elastic return force of the bending portion 13c of the leaf spring 13,
The fixing portion 13a of the leaf spring 13 is connected to the guide portion 11d of the hub 11.
Press it against the tip of

After stacking in such a state, the hub 11
By thermally deforming the tip of the deformed portion 11e by ultrasonic welding, the assembly of the armature assembly is completed. Therefore, the armature 12 is supported by the hub 11 so as to be movable in the axial direction, and is constantly urged toward the hub 11 by the elastic return force of the leaf spring 13.

The electromagnetic coupling device having such a configuration is mounted on a solid shaft of the driven-side rotating member, and the gear of the driving-side rotating member and the hub 11 mesh with each other to rotate the armature assembly. When a magnetic flux Φ is generated by energizing the electromagnetic coil 6, the leaf spring 13
Since the armature 12 is magnetically attracted to the rotor 5 against the elastic return force of the following, the solid shaft of the driven side rotating member rotates. When the current supply to the electromagnetic coil 6 is cut off to eliminate the magnetic flux Φ, the armature 12 is separated from the rotor 5 by the elastic restoring force of the leaf spring 13, and the armature assembly idles.

Next, FIGS. 6 to 6 show another embodiment.
The armature assembly of FIG. 8 will be described. 6 is an exploded perspective view, FIG. 7 is a sectional view, and FIG. 8 is a plan view. The armature assemblies shown in these drawings include a hub 14 molded of a synthetic resin material and an armature 15 made of a rolled steel plate or the like.
And a leaf spring 16 made of a thin metal plate.

The hub 14 has teeth 14a formed on the outer peripheral surface.
And a boss 14b having a tip facing the side surface of the rotor 5 on the friction surface side, and a cover 14c formed coaxially outside the boss 14b in the radial direction. On the inner surface on the rotor 5 side, a prismatic guide portion 14d protruding in the axial direction is formed at a position obtained by dividing the circumferential direction of the hub 14 into three equal parts. The guide portion 14d is formed inside the cover 14c, and protrudes toward the rotor 5 (axial direction) with both sides in the circumferential direction and side surfaces in the radial direction being exposed. Further, at the center of the distal end surface of each guide portion 14d, a cylindrical deformed portion 1 protruding in the axial direction from the distal end surface is provided.
4e are formed.

Further, on the distal end surface of the guide portion 14d of the hub 14, there is provided a built-up portion 14f formed in a concave shape around the deformed portion 14e so as to open radially outward. The circumferentially outer side surface and the radially inner side surface of each build-up portion 14f are formed in the same plane as the circumferentially outer side surface and the radially inner side surface of the guide portion 14d, respectively. It protrudes in the direction.

The armature 15 has a guide groove 15a slidably fitted in a guide portion 14d of the hub 14 at a position where the outer peripheral surface is equally divided into three. Further, the armature 15 is provided with a mounting portion 15b projecting radially outward from the friction surface at a position obtained by dividing the outer peripheral surface different from the position of the guide groove 15a into three equal parts in the circumferential direction. This mounting part 1
The side surface (mounting surface) of the rotor 5 on the rotor 5 side is formed lower than the friction surface of the armature 15 facing the friction surface of the rotor 5, and the mounting surface of the mounting portion 15b is
Is formed slightly higher than the distal end surface of the guide portion 14d of the hub 14 toward the rotor 5 in a state where the anti-friction surface side overlaps the inner surface of the hub 14, and is separated from the inner surface of the hub 14.

The plate spring 16 has a disk-shaped fixing portion 16a formed at a position where the circumferential direction is divided into three equal parts, and an arc-shaped bending portion 16c is formed between adjacent fixing portions 16a. A through hole 16b is formed at the center of each fixing portion 13a.

An armature assembly is constituted by the hub 14, the armature 15, and the leaf spring 16 having such a shape. To assemble the armature assembly, the guide groove 15a of the armature 15 is
4 d, the anti-friction surface side of the armature 15 is overlapped with the inner surface of the hub 14. Next, the through hole 16 of the leaf spring 16
b, the deformed portion 14e of the hub 14 is inserted into the armature 15a.
On the mounting surface of the mounting portion 15b. The leaf spring 16
The fixing portion 16a of the leaf spring 16 is pressed against the distal end surface of the guide portion 14d of the hub 14 and overlapped against the elastic return force of the bending portion 16c.

After stacking in such a state, the hub 14
By thermally deforming the tip of the deformed portion 14e by ultrasonic welding, the assembly of the armature assembly is completed. Accordingly, the armature 15 is supported by the hub 14 so as to be movable in the axial direction, and is always urged toward the hub 14 by the elastic return force of the leaf spring 16.

In the armature assembly according to this embodiment, the wall surface of the guide groove 15a of the armature 15 (in other words, the circumferential side surface of the guide groove 15a)
The guide groove 15a of the armature 15 is configured to abut on the guide surface of the guide portion 14d of the hub 14 (in other words, the circumferential side surface of the guide portion 14d) and the circumferential side surface of the overlay portion 14e of the hub 14. Is slidably fitted to the guide portion 14d of the hub 14. The electromagnetic coupling device provided with such an armature assembly can transmit power and cut off power transmission, similarly to the electromagnetic coupling device described above.

Next, FIGS. 9 to 9 show another embodiment.
The armature assembly of FIG. 11 will be described. 9 is an exploded perspective view, FIG. 10 is a sectional view, and FIG. 11 is a plan view. The armature assemblies shown in these drawings are provided with a hub 17 molded of a synthetic resin material, an armature 18 made of a rolled steel plate or the like, and a leaf spring 19 made of a thin metal plate.

The hub 17 has teeth 17a formed on the outer peripheral surface.
A boss 17b having a tip facing a side surface of the rotor 5 on the friction surface side, and a cover 17c formed coaxially on a radially outer side of the boss 17b and formed at the same circumferential interval. An arc-shaped protruding portion 17d protruding in the axial direction from the inner surface of the hub 17 on the rotor 5 side is provided. On the inner surface of the hub 17 on the rotor 5 side, there is formed a prismatic guide portion 17e projecting toward the rotor 5 (axial direction) at a position obtained by dividing the circumferential direction of the hub 17 into three equal parts. Furthermore, at the center of the distal end surface of each guide portion 17e,
A cylindrical deformed portion 17f axially protruding from the distal end surface
Are formed. Reference numeral 17g denotes an annular groove formed for reducing the weight of the hub 17.

The armature 18 has a guide groove 18a slidably fitted in the guide portion 17e of the hub 17 at a position where the outer peripheral surface is divided into three equal parts. The armature 18 has a mounting portion 18 projecting outward in the radial direction at a position obtained by dividing the outer peripheral surface different from the position of the guide groove 18a into three equal parts.
b is formed. The side surface (mounting surface) of the mounting portion 18 b on the rotor 5 side is formed lower than the friction surface of the armature 19 facing the friction surface of the rotor 5.
The mounting surface 8b is placed on the hub 1 with the anti-frictional surface of the armature 18 superimposed on the inner side surface (projection 17d) of the hub 17.
7 is provided slightly higher than the distal end surface of the guide portion 17 e toward the rotor 5, and is separated from the inner side surface of the hub 17.

The plate spring 19 has a rectangular fixing portion 19a formed at a position obtained by dividing the circumferential direction into three equal parts, and an arc-shaped bending portion 19c is formed between adjacent fixing portions 19a. 19a has a shape protruding radially inward from the inner peripheral surface of the bending portion 19c. In the center of each fixing portion 19a, the through hole 1 into which the deformed portion 17f of the hub 17 is inserted.
9b is drilled. Further, the fixed portion 19a of the leaf spring 19 is provided with a fixed portion 1 in the circumferential direction of the leaf spring 19.
A pair of bent portions 19d bent at the side surface of 9a is provided.

The hub 17 having such a shape, the armature 18 and the leaf spring 19 constitute an armature assembly. To assemble the armature assembly, the guide groove 18 a of the armature 18 is inserted into the guide portion 1 of the hub 17.
7e, the anti-friction surface side of the armature 18 is overlapped with the inner side surface (projection 17d) of the hub 17. Next, the deformed portion 17f of the hub 17 is inserted into the through hole 19b of the leaf spring 19, and the central portion of the bent portion 19c of the leaf spring 19 is placed on the placing surface of the placing portion 18b of the armature 18.
Further, the fixing portion 19a of the leaf spring 19 is connected to the guide portion 1 of the hub 17 against the elastic return force of the bending portion 19c of the leaf spring 19.
7e and press it over. At the same time, the pair of bent portions 19 d of the leaf spring 19 are connected to the guide portions 1 of the hub 17.
The guide surface 7e is put on the guide surface (in other words, the circumferential side surface of the guide portion 17e), and the guide surface and the wall surface of the guide groove 18a of the armature 18 (in other words, the circumferential side surface of the guide groove 18a) Intervenes between

After stacking in such a state, the hub 17
By thermally deforming the tip of the deformed portion 17f by ultrasonic welding, the assembly of the armature assembly is completed. Therefore, the armature 18 is supported by the hub 17 so as to be movable in the axial direction, and is always urged toward the hub 17 by the elastic return force of the leaf spring 19.

The armature assembly of this embodiment is configured such that the wall surface of the guide groove 18a of the armature 18 comes into contact with the bent portion 19d of the leaf spring 19,
The guide groove 18a of the armature 18 is slidably fitted to a bent portion 19d of a leaf spring 19 that is covered by the guide portion 17e of the hub 17. The electromagnetic coupling device provided with such an armature assembly can transmit power and cut off power transmission, similarly to the electromagnetic coupling device described above.

As described above, in the embodiment, the armature 1
The armature assembly of the electromagnetic clutch in which the magnets 2, 15, and 18 are magnetically attracted to the rotor 5 has been described. In the armature assembly of the present invention, the armatures 12, 15, and 18 are magnetically attracted to the friction surface provided on the yoke 7. It also applies to electromagnetic brakes.

As an embodiment, the hubs 11, 1
Guide portions 11d, 14d, 17
e and the armatures 12, 15, 18
Guide grooves 12a, 15a, and 18a are formed on the outer peripheral surface of the armature assembly.
Guide portions 11d, 14d, 17
e and the armatures 12, 15, 18
The guide grooves 12a, 15a, 18a may be formed on the inner peripheral surface of the.

In the embodiment, the hubs 11, 14, and 17 molded with a synthetic resin material are shown. However, the armature assembly of the present invention is provided on the distal end surface of the guide portion of the hub made of a metal material. The fixed portion of the leaf spring is fixed to the guide portion of the hub by providing a cylindrical deformed portion and deforming the tip of the deformed portion inserted into the through hole of the fixed portion of the leaf spring by caulking. Is also good. When a metal hub is formed, it is not necessary to provide the bent portion 19d of the leaf spring 19.

[0047]

According to the first aspect of the present invention, there is provided an armature assembly having a guide portion of a hub and a mounting portion of an armature provided at intervals in a circumferential direction, and an annular leaf spring superposed on the guide portion and the mounting portion. By fixing the fixing portion to the tip of the guide portion, the bending portion of the leaf spring is configured to be elastically deformed, so that the dimensions of the hub boss portion can be reduced. Therefore, a lightweight and compact electromagnetic coupling device can be provided.

In the armature assembly according to the second aspect of the present invention, the fixed portion of the leaf spring is fixed to the guide portion of the hub in a state where the bent portion of the leaf spring is elastically deformed. It is always biased toward the hub. Therefore, when the armature assembly is idling, the guide groove of the armature does not collide with the guide portion of the hub due to external vibration, and the generation of unpleasant noise can be prevented.

In the armature assembly according to the third aspect of the present invention, the contact area between the guide portion of the hub and the guide groove of the armature is increased, and the surface pressure acting on the guide portion of the hub can be reduced. Therefore, it is possible to provide a lightweight and compact electromagnetic coupling device having excellent durability.

In the armature assembly according to the fourth aspect of the present invention, since the wall surface of the guide groove of the armature made of a metal material does not directly collide with the guide surface of the guide portion of the hub, it is integrally formed of a synthetic resin material or the like. The durability of the guide portion of the hub is improved. Therefore, it is possible to provide a lightweight and compact electromagnetic coupling device having excellent durability.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electromagnetic coupling device provided with an armature assembly shown as an embodiment of the present invention.

FIG. 2 is a first shaft member of FIG. 1, wherein (a) is a left side view of (b), (b) is a cross-sectional view, and (c) is a right side view of (b).

3 (a) is a left side view of FIG. 1 (b), and FIG. 3 (b) is a front view. FIG.

FIG. 4 is a plan view of the rotor of FIG. 1;

FIG. 5 is an exploded perspective view of the armature assembly of FIG. 1;

FIG. 6 is an exploded perspective view of an armature assembly shown as another embodiment.

FIG. 7 is a sectional view of the armature assembly of FIG. 6;

FIG. 8 is a plan view of the armature assembly of FIG. 6;

FIG. 9 is an exploded perspective view of an armature assembly shown as another embodiment.

FIG. 10 is a sectional view of the armature assembly of FIG. 9;

FIG. 11 is a plan view of the armature assembly of FIG. 9;

[Explanation of symbols]

 Reference Signs List 11 hub 11d guide portion 11e deformable portion 12 armature 12a guide groove 12b mounting portion 13 leaf spring 13a fixing portion 13c bending portion 14 hub 14d guide portion 14e deformable portion 14f buildup portion 15 armature 15a guide groove 15b mounting portion 16 Leaf spring 16a Fixed part 16c Flexing part 17 Hub 17e Guide part 17f Deformed part 18 Armature 18a Guide groove 18b Placing part 19 Leaf spring 19a Fixed part 19c Flexing part 19d Bending part

Claims (4)

[Claims] 1. A hub provided with a plurality of guide portions formed at intervals in a circumferential direction and protruding in an axial direction from an inner surface, and the guide portions formed on a circumferential surface at an interval in a circumferential direction. A plurality of guide grooves slidably fitted in the hub; and a plurality of mounting portions formed between the circumferentially adjacent guide grooves and protruding radially from a friction surface. An armature superimposed on a side surface; a plurality of fixing portions superposed and fixed on a distal end surface of the guide portion of the hub; and a central portion in the circumferential direction formed between the fixing portions adjacent in the circumferential direction. An armature mounting portion provided with a plurality of bending portions provided on the mounting surface of the mounting portion, wherein the mounting surface of the armature mounting portion, the mounting surface of the guide portion of the hub from the tip surface Away from the inner surface of the hub,
The armature assembly of the electromagnetic coupling device, wherein a bending portion of the leaf spring is elastically deformed. 2. The armature assembly of the electromagnetic coupling device according to claim 1, wherein a deformable portion protruding in an axial direction is provided on a distal end surface of a guide portion of the hub, and the fixed portion of the leaf spring is provided on the fixed portion of the leaf spring. A through-hole into which the deformed portion of the hub is inserted is provided, and the fixed portion of the leaf spring is pressed against the distal end surface of the guide portion of the hub, and the flexible portion of the leaf spring is elastically deformed. An armature assembly for an electromagnetic coupling device, wherein a deformed portion is deformed. 3. The armature assembly for an electromagnetic coupling device according to claim 1, wherein a circumferential side surface is formed on the distal end surface of the guide portion of the hub so as to be flush with the guide surface of the guide portion. An armature assembly for an electromagnetic coupling device, wherein the armature assembly is provided with a built-up portion projecting in the axial direction and having a guide groove of the armature slidably fitted therein. 4. The armature assembly for an electromagnetic coupling device according to claim 1, wherein the leaf spring is interposed between the guide surface of the guide portion of the hub and the wall surface of the guide groove of the armature. An armature assembly for an electromagnetic coupling device, comprising a bent portion.