JP2001032857A - Electromagnetic connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve aseimatic property of an armature. SOLUTION: Vibrationproofing rubber 23 fitted in a large diametrical cylinder part 22a of a headed member 22 is interposed between a head part 22b of the headed member 22 and a stopper plate 18. Additionally, an outside cylinder part 23b integrally formed on an outer peripheral surface of a disc part 23a and an inside cylinder part 23c integrally formed on the disc part 23a with an interval on the inside of this outside cylinder part 23b are provided on the vibrationproofing rubber 23. When an armature oscillates by large outside vibration, the outside cylinder part 23b and the inside cylinder part 23c of the vibrationproofing rubber 23 are compressed by the head part 22b of the headed member 22, and consequently, aseismatic property of the armature is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic coupling device provided with an anti-vibration rubber.

[0002]

2. Description of the Related Art A conventional electromagnetic coupling device prevents an attraction sound generated when an armature supported by a plate spring on an armature hub is magnetically attracted to a friction surface of an armature attraction member facing an air gap. For this purpose, an anti-vibration rubber for absorbing the vibration of the armature is provided.

[0003] Such an electromagnetic coupling device is disclosed in Japanese Patent No. 290.
7382. Hereinafter, the electromagnetic coupling device described in the publication will be described with reference to FIG.
Among the electromagnetic coupling devices, an electromagnetic clutch is a power transmission device that magnetically attracts an armature to a rotor, which is an armature attracting member, and transmits the rotation of the rotor to a driven device to which the armature is attached, for example, a rotating shaft of a vehicle air conditioning compressor. . FIG. 3 is a cross-sectional view of only the upper half of the armature assembly. The armature hub 1 is mounted on a rotating shaft of a compressor (not shown) so as to be integrally rotatable. The armature hub 1 has a spline hole in the center of which a rotating shaft is spline-fitted, and a flange 1a extending in a radial direction on an outer peripheral surface.

[0004] On the flange portion 1a of the armature hub 1, a base end portion of a leaf spring 2 is superimposed on one side surface, and a stopper plate 3 is superimposed on the other side surface. And
By caulking the rivet 4 penetrating these members, the base end of the leaf spring 2 and the stopper plate 3 are integrally fixed to the flange portion 1a of the armature hub 1. A free end (not shown) of the leaf spring 2 is fixed by rivets to an armature 5 arranged concentrically with the armature hub 1. The armature 5 is formed with a stepped hole 5a, for example, at a position obtained by dividing the circumferential direction into three equal parts.
In addition, three headed members 6 are fixed to the armature 5 by caulking the small-diameter cylindrical portion 6e in each stepped hole 5a.

The headed member 6 includes a large-diameter cylindrical portion 6a and an umbrella-shaped head 6b formed at one end of the large-diameter cylindrical portion 6a.
And a small-diameter cylindrical portion 6e formed at the other end of the large-diameter cylindrical portion 6a and inserted into the stepped hole 5a of the armature 5. The head 6b of the headed member 6 is bent near the outer peripheral surface so that the conical outer peripheral wall 6 is formed.
c and an arc-shaped inner bent portion 6d formed inside the outer peripheral wall portion 6c. The distal end face of the outer peripheral wall 6c is chamfered in an arc shape. The headed member 6 having such a shape is inserted into the stepped hole 5a of the armature 5 with the end face of the large-diameter cylindrical portion 6a inserted into the through hole 3a of the stopper plate 3 abutting against the side surface of the armature 5. Is caulked. A gap S having a size larger than the size of an air gap formed between the armature 5 and a rotor (not shown) is formed between the chamfered outer end wall 6c and the stopper plate 3.
1 is formed.

[0006] Between the head 6b of the headed member 6 fixed to the armature 5 and the stopper plate 3, in order to prevent an armature suction noise generated when the armature 5 is magnetically attracted to a rotor (not shown). A stopper rubber 8 is provided between the armature 5 and the stopper plate 3 to limit the retreat amount of the armature 5 separated from a rotor (not shown) by the spring force of the leaf spring 2. The vibration-proof rubber 7 and the stopper rubber 8 are fitted to the large-diameter cylindrical portion 6 a of the headed member 6.

[0007] The vibration isolating rubber 7 has a cylindrical portion 7a whose both end surfaces are formed into a curved surface that matches the curved surface of the inner bent portion 6d of the headed member 6.
And a disk portion 7b integrally formed substantially at the center of the inner peripheral surface of the cylindrical portion 7a, and formed with a through hole at the center where the large-diameter cylindrical portion 6a of the headed member 6 is fitted. I have. The stopper rubber 8 includes a disc portion 8a sandwiched between the armature 5 and the stopper plate 3, and a through hole 3a formed in one side surface of the disc portion 8a.
Is provided with a cylindrical portion 8b loosely fitted to the disk portion 8a.
The large diameter cylindrical portion 6a of the headed member 6 is fitted into a through hole formed at the center of the cylindrical portion 8b. A gap is formed between the tip of the cylindrical portion 8b of the stopper rubber 8 and the side surface of the disk portion 7b of the vibration isolating rubber 7 so as not to abut. Also,
A gap S2 and a gap S3 are formed between the disk portion 7b of the vibration isolating rubber 7 and the head 6b of the headed member 6, and between the disk portion 7b of the vibration isolating rubber 7 and the stopper plate 3. I have.

In the conventional electromagnetic clutch having such a structure, the armature 5 is configured to resist the spring force of the leaf spring 2 and the elastic force of the vibration isolating rubber 7 by the magnetic attraction force of the magnetic flux of an electromagnetic coil (not shown). Magnetically attracted to a rotor not shown. Further, vibration generated by an impact when the armature 5 is magnetically attracted to the rotor is absorbed by the vibration isolating rubber 7, so that uncomfortable armature attracting sound can be prevented. Further, since the magnetic flux of the electromagnetic coil disappears, the armature 2 separated from the rotor comes into contact with the stopper plate 3 with the stopper rubber 8 interposed therebetween due to the spring force of the leaf spring 2, so that the uncomfortable armature release sound is generated. Can also be prevented.

[0009]

In general, an electromagnetic clutch has a plate spring 2 attached to an armature 5 with a stopper rubber 8 interposed between the armature 5 and a stopper plate 3.
By fixing the free end of the leaf spring 2, an initial preset load is applied to the leaf spring 2. That is,
The armature 5 rests on the stopper rubber 8 by the initial preset load of the leaf spring 2 so that the armature 5 that has swung due to external vibration such as vibration of the vehicle engine or vibration while the vehicle is running does not collide with the rotor. It has a structure to hold. However, the size of the air gap provided between the armature 5 and the rotor is very narrow (for example, a dimension of about 0.5 mm), and when a large external vibration acts, the armature 5 may collide with the rotor. It was considered to improve the earthquake resistance of the armature 5 against external vibrations caused by the vibration rubber 7. In addition, the vibration isolating rubber 7 of the conventional electromagnetic clutch has a thickness of the cylindrical portion 7a of, for example, 1 so that the spring load characteristic of the leaf spring 2 is not affected.
About 2 mm to reduce the rigidity, and the cylindrical plate 7a is provided with the stopper plate 3 and the headed member 6.
And a slight preload is applied by being clamped between the head 6b and the disk portion 7b of the vibration-proof rubber 7.
Has a structure in which a small preload is applied by fitting the large-diameter cylindrical portion 6a of the headed member 6 to a thickness of, for example, about 2 to 3 mm, and is large against the preset load of the leaf spring 2. It was considered that it was difficult to hold the armature 5 that oscillates due to external vibrations still with the elastic force of the vibration-proof rubber 7.

That is, when the armature 5 tilts and swings in the axial direction, the center line of the headed member 6 is tilted with respect to the center line of the vibration-proof rubber 7, and the head 6 b of the headed member 6 causes the vibration-proof rubber 7 to move. Since only a part of the cylindrical portion 7a is pressed toward the stopper plate 3 and compressed, it is difficult to improve the earthquake resistance of the armature 5 by the vibration-proof rubber 7 having the above-described shape and structure. An object of the present invention is to improve the earthquake resistance of an armature that swings due to a large external vibration against an initial preset load of a leaf spring.

[0011]

In order to achieve such an object, an electromagnetic coupling device according to the first aspect of the present invention includes an armature hub (reference numeral 16 in the embodiment, the same applies hereinafter) and this armature hub. A leaf spring (1) having a base end (17a) fixed to a flange (16a) of (16).
7), an armature (20) to which the free end (17b) of the leaf spring (17) is fixed, and a flange portion of the armature hub (16) which is disposed on the anti-frictional surface side of the armature (20). A stopper plate (18) extending from (16a) and a large-diameter cylindrical portion (22a) inserted through a through hole (18a) of the stopper plate (18).
And a conical outer peripheral wall portion (2) formed at one end of the large-diameter cylindrical portion (22a) and spaced apart from the side surface of the stopper plate (18) on the side opposite to the armature.
2d) and a small-diameter cylindrical portion (22c) formed at the other end of the large-diameter cylindrical portion (22a) and fixed to the armature (20). A headed member (22) in which an end surface (22f) of the radial cylindrical portion (22a) is in contact with the anti-friction surface side of the armature (20), and a large-diameter cylindrical portion (22) of the headed member (22).
a) and a disk portion (23a) fitted to the disk portion (2a).
An outer cylindrical portion (23b) integrally formed on the outer peripheral surface of 3a) and protruding both end surfaces, and both end surfaces formed integrally with the disc portion (23a) inside the outer cylindrical portion (23b) with a space therebetween. Is provided with an inner cylindrical portion (23c) protruding therefrom, and a vibration-proof rubber () interposed between the head (22b) of the headed member (22) and the side opposite to the armature of the stopper plate (18). 23), a side surface on the anti-friction surface side of the armature (20) fitted to the large-diameter cylindrical portion (22a) of the headed member (22), and a side surface on the armature side of the stopper plate (18). A stopper rubber (24) interposed therebetween, an armature suction member (rotor 9) opposed to the friction surface (20a) of the armature (20) with an air gap (G) therebetween, and the armature (20) as described above. Armor An electromagnetic coil (14) for generating a magnetic flux to be magnetically attracted is provided on the armature attracting member (9), and a side surface of the stopper plate (18) on the side opposite to the armature and an outer peripheral wall portion (22d) of the headed member (22). The gap (S4) formed between the tip and the tip is a gap having a size larger than the air gap (G).

According to a second aspect of the present invention, in the electromagnetic coupling device according to the first aspect, the anti-vibration rubber (2
3) The end face of the inner cylindrical portion (23c) and the headed member (2).
A gap having a size smaller than the air gap (G) is formed between the air gap (G) and the head (22b) of (2).

The electromagnetic coupling device according to a third aspect of the present invention is the electromagnetic coupling device according to the first or second aspect, wherein the end face of the inner cylindrical portion (23c) of the vibration isolating rubber (23) and the stopper plate (18) are provided. A gap having a smaller size than the air gap (G) is formed between the side and the side opposite to the armature.

[0014]

1 and 2 show an electromagnetic clutch mounted on a vehicle air-conditioning compressor. FIG. 1 is a sectional view, and FIG. 2 is an enlarged view of only essential parts of FIG. It is a cross section shown. Hereinafter, embodiments of the electromagnetic coupling device will be described with reference to these drawings. The electromagnetic clutch shown in the drawing includes a rotor 9 rotatably supported on a cylindrical portion of a compressor, a field core 10 inserted into an annular groove 9a of the rotor 9 and supported on a side surface of the compressor, and integrally rotating with a rotating shaft of the compressor. Armature assembly 1 mounted as possible
1 is provided.

The rotor 9 has an inner cylindrical portion 9b in which the outer ring of the bearing 12 is fitted and fixed to the cylindrical portion of the compressor and secured thereto, and an outer side in which a poly-V groove 9c is rolled on the outer peripheral surface. A cylindrical portion 9d and a disk portion 9e connecting the ends of the inner cylindrical portion 9b and the outer cylindrical portion 9d are provided, and an annular groove 9a opened to the housing side of the compressor is formed. The disk portion 9e has a plurality of arc-shaped magnetically disconnected slits 9f stamped out at intervals in the circumferential direction.
Is provided, and the anti-annular groove 9a side of the disk portion 9e is used as a friction surface 9g. The field core 10 is provided with an annular groove 10a which is opened on the side opposite to the annular groove 9a of the rotor 9 in the axial direction, and an electromagnetic coil 14 covered with a coil bobbin 12 and a coil cover 13 is accommodated in the annular groove 10a. I have. The field core 10 is supported by the compressor by screwing a mounting plate 15 fixed to the rear surface to the housing of the compressor.

The armature assembly 11 is provided with an armature hub 16 which is spline-fitted to the rotating shaft and fixed with a backing plate and bolts. Further, a stopper plate 18 is superimposed on the flange portion 16a of the armature hub 16 via the base end portion 17a of the leaf spring 17, and
The base end portion 17a of the leaf spring 17 and the stopper plate 1
8 is fixed to the flange portion 16a of the armature hub 16 with rivets 19. Further, a disk-shaped armature 20 is provided radially outside the flange portion 16a of the armature hub 16. Armature 20
The free end portion 17b of the leaf spring 17 is fixed by a rivet 21 and supported by the armature hub 16 so as to be movable only in the axial direction. The armature 20 is formed with an arc-shaped demagnetizing slit (not shown), and a friction surface 9g of the rotor 9 is formed.
And an air gap G (for example, a gap of about 0.5 mm), and a stepped hole 20b formed at a position where the circumferential direction is equally divided.

The armature 20 is fixed with a headed member 22 which is caulked in each stepped hole 20b. As shown in FIG.
Is a large-diameter cylindrical portion 22a inserted into a through hole 18a formed in the stopper plate 18, and the large-diameter cylindrical portion 22a
An umbrella-shaped head 22b integrally formed at one end of
A small-diameter cylindrical portion 22c is formed integrally with the other end of the large-diameter cylindrical portion 22a and inserted into the stepped hole 20b of the armature 20, and the tip is caulked in the stepped hole 20b. . The head 22b of the headed member 22 has a conical outer peripheral wall 22d formed by pressing the outer peripheral surface thereof toward the stopper plate 18 side, and is formed inside the outer peripheral wall 22d. An inner bent portion 22e is provided. Further, a large-diameter cylindrical portion 2
The end face of the small-diameter cylindrical portion 22c on the end face of the small-diameter cylindrical portion 22c is set to the stepped hole 20 of the armature 20.
It is provided as an abutting portion 22f to be abutted when caulking in b.

The large-diameter cylindrical portion 22a of the headed member 22 having such a shape is provided with an anti-vibration rubber 23 and a stopper rubber 24.
Are fitted. As shown in FIG. 2 in an enlarged manner, the vibration-isolating rubber 23 is fitted to the large-diameter cylindrical portion 22a of the headed member 22 and a slightly preloaded disc portion 23a (2 to 3 mm).
), An outer cylindrical portion 23b (having a thickness of about 1 to 2 mm) integrally formed on the outer peripheral surface of the disk portion 23a and projecting at both end surfaces, and a space inside the outer cylindrical portion 23b. An inner cylindrical portion 23c (thickness of about 1 to 2 mm) is formed integrally with the disk portion 23a and has both end surfaces protruding therefrom. In addition, the anti-vibration rubber 23 illustrated in the embodiment has a disc portion 23 between the outer cylindrical portion 23b and the inner cylindrical portion 23c.
The dimensions projecting in the axial direction from “a” are different.

That is, the headed member 22 is connected to the armature 2
0, the outer peripheral wall 22 of the headed member 22 is fixed.
d, a gap S4 larger than the air gap G between the armature 20 and the rotor 9 is formed between the tip and the side surface of the stopper plate 18 on the side opposite to the armature 20, and is formed with the disk portion 23a of the vibration-proof rubber 23. Gaps S5 and S6 are formed between the head member 22 and the head portion 22b, and between the disk portion 23a of the vibration isolation rubber 23 and the side surface of the stopper plate 18 on the side opposite to the armature 20, respectively. Also, anti-vibration rubber 2
A slight preload is applied to the third outer cylindrical portion 23b. In such a state, between one of the end surfaces of the inner cylindrical portion 23c and the head 22b of the headed member 22,
Anti-armature 2 of the other end face and stopper plate 18
A slight gap smaller than the air gap G is formed between the side surface on the 0 side.

The stopper rubber 24 protrudes into a disc portion 24a interposed between the side surface of the armature 20 on the anti-friction surface side and the side surface of the stopper plate 18 on the armature 20 side and into the through hole 18a of the stopper plate 18. A cylindrical portion 24b is provided. The tip of the cylindrical portion 24b is
The stopper plate 18 is formed so as not to protrude from the through hole 18a.

In the electromagnetic clutch having the above structure, the spring force of the leaf spring 17 and the vibration isolating rubber 2 are generated by the magnetic attraction force of the magnetic flux generated when the electromagnetic coil 14 is energized.
The friction surface 20a of the armature 20 is magnetically attracted to the friction surface 9g of the rotor 9 against the elastic force of the rotor 3. Then, since the rotor 9 and the armature 20 rotate integrally and power is transmitted to the rotating shaft, the compressor is driven. Further, if the current supply to the electromagnetic coil 14 is stopped to eliminate the magnetic flux, the armature 20 is separated from the rotor 9 by the spring force of the leaf spring 17 and contacts the stopper rubber 24, so that the compressor is stopped.

When the armature 20 is magnetically attracted to the rotor 9, the vibration isolating rubber 23 is elastically deformed between the head 22b of the headed member 22 and the stopper plate 18, so that the friction surface 20a of the armature 20 is formed. The vibration of the armature 20 generated by magnetically attracting to the friction surface 9g of the rotor 9 is absorbed by the vibration-proof rubber 23, and the armature suction noise is prevented. In particular, in the electromagnetic clutch described as the embodiment, only the outer cylindrical portion 23b of the vibration isolating rubber 23 is compressed at the movement start point of the armature 22, and the outer cylindrical portion 23b of the vibration isolating rubber 23 and the inner cylinder 23 just before the movement end point of the armature 22. The structure is such that both of the cylindrical portions 23c are compressed.

Therefore, since the impact between the armature 20 and the rotor 9 due to the magnetic attraction of the magnetic flux is reduced, the armature suction noise can be effectively prevented. Further, since the outer cylindrical portion 23b and the inner cylindrical portion 23c are provided with a space therebetween, each of the cylindrical portions 23b and 23c is easily elastically deformed. The suction time does not increase.

Although the electromagnetic clutch has been described as an embodiment, the electromagnetic coupling device of the present invention uses the field core 10 having the friction plate fixed to the opening as an armature attracting member, and the armature is attached to the magnetic pole surface of the field core 10. 2
An electromagnetic brake in which 0 is magnetically attracted may be used. When the power supply to the electromagnetic coil 14 is cut off,
The both end surfaces of the inner cylindrical portion 23c are the heads 22 of the headed member 22.
b and the structure that does not contact the stopper plate 18,
One end face of the inner cylindrical portion 23c and the head 2 of the headed member 22
2b and the inner cylindrical portion 2
A structure in which a gap is provided only between the other end surface of the stopper plate 18 and the side surface of the stopper plate 18 on the side opposite to the armature 20, or a structure in which both end surfaces of the inner cylindrical portion 23c are
2b or a structure that abuts against the stopper plate 18 may be used.

[0025]

According to the first aspect of the present invention, there is provided an electromagnetic coupling device, wherein a disk portion fitted to a large-diameter cylindrical portion of a headed member and an outer peripheral surface of the disk portion are integrally formed and both end surfaces protrude. An outer cylindrical portion;
An anti-vibration rubber having an inner cylindrical portion formed integrally with the disk portion at an interval inside the outer cylindrical portion and having both end surfaces protruding is provided, and the anti-vibration rubber is used for the head of the headed member and the stopper plate. Because it is interposed between the side of the anti-armature side, when the armature swings in the axial direction due to large external vibration, the head of the headed member fixed to the armature and the outer cylindrical portion of the vibration isolation rubber Since the inner cylindrical portion is pressed to the stopper plate side and compressed, the vibration resistance of the armature by the vibration-proof rubber is improved as compared with the conventional electromagnetic clutch. In addition, since the outer cylindrical portion and the inner cylindrical portion of the vibration isolating rubber are provided at a distance, these cylindrical portions are easily elastically deformed when compressed by the headed member, and the armature suction time is long enough to cause a problem in operation characteristics. It will not be. Therefore, the earthquake resistance of the armature is improved while maintaining the armature attraction characteristics obtained by the spring load of the leaf spring and the magnetic attraction force of the magnetic flux of the electromagnetic coil in a good state.

The electromagnetic coupling device according to the second aspect is the first aspect of the invention.
In the electromagnetic coupling device described above, a gap having a size smaller than an air gap is formed between the end surface of the inner cylindrical portion of the anti-vibration rubber and the head of the headed member, and the outer side of the anti-vibration rubber just before the movement end point of the armature. Both the cylindrical part and the inner cylindrical part are compressed by the headed member, so that the armature's seismic resistance is improved and the armature suction noise is more effectively prevented without prolonging the armature suction time. Can be.

According to the third aspect of the present invention, there is provided an electromagnetic coupling device.
Or the electromagnetic coupling device according to 2, wherein a gap smaller than the air gap is formed between the end surface of the inner cylindrical portion of the vibration isolating rubber and the side surface on the side opposite to the armature of the stopper plate, and the gap is prevented immediately before the end point of the movement of the armature. Both the outer cylindrical part and the inner cylindrical part of the vibration rubber are compressed by the headed member, which improves the armature's seismic resistance and more effectively reduces the armature suction sound without prolonging the armature suction time. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electromagnetic clutch shown as an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a cross-sectional view of only the upper half of a conventional armature assembly.

[Explanation of symbols]

 Reference Signs List 9 rotor (armature adsorption member) 14 electromagnetic coil 16 armature hub 17 leaf spring 18 stopper plate 20 armature 22 headed member 22a large-diameter cylindrical portion 22b head 22c small-diameter cylindrical portion 22d outer peripheral wall portion 23 anti-vibration rubber 23a disk portion 23b Outer cylindrical part 23c Inner cylindrical part 24 Stopper rubber 24a Disk part 24b Cylindrical part

Claims (3)

[Claims] 1. An armature hub, a leaf spring having a base end fixed to a flange portion of the armature hub, an armature having a free end fixed to the leaf spring, and an armature disposed on a side opposite to the friction surface of the armature. A stopper plate provided and extended to a flange portion of the armature hub, a large-diameter cylindrical portion inserted through a through hole of the stopper plate,
A head formed at one end of the large-diameter cylindrical portion, opposed to a side surface of the stopper plate on the side opposite to the armature at a distance, and formed with a conical outer peripheral wall portion; and the other of the large-diameter cylindrical portion. A small-diameter cylindrical portion formed at the end of the armature and fixed to the armature, a headed member having an end surface of the large-diameter cylindrical portion in contact with the anti-friction surface side of the armature, and a large diameter of the headed member. A disk part fitted to the cylindrical part,
An outer cylindrical portion integrally formed on the outer peripheral surface of the disk portion and projecting at both end surfaces, and an inner cylindrical portion integrally formed on the disk portion at an interval inside the outer cylindrical portion and projecting at both end surfaces. Provided, a vibration-proof rubber interposed between the head of the headed member and a side surface of the stopper plate on the side opposite to the armature, fitted to a large-diameter cylindrical portion of the headed member, and A stopper rubber interposed between a side surface on the anti-friction surface side and a side surface on the armature side of the stopper plate, an armature suction member facing the friction surface of the armature with an air gap, and the armature suction member An electromagnetic coil that generates magnetic flux to be magnetically attracted is provided, and a gap formed between a side of the stopper plate on the side opposite to the armature and a tip of an outer peripheral wall of the headed member is formed. Electromagnetic coupling device is characterized in that a gap of larger dimensions than the serial air gap. 2. The electromagnetic coupling device according to claim 1, wherein a gap smaller than the air gap is formed between an end surface of an inner cylindrical portion of the vibration isolating rubber and a head of the headed member. An electromagnetic coupling device, comprising: 3. The electromagnetic coupling device according to claim 1, wherein the air gap is smaller than an air gap between an end surface of the inner cylindrical portion of the vibration isolating rubber and a side surface of the stopper plate opposite to the armature. An electromagnetic coupling device, wherein a dimensional gap is formed.