JP2002098170A - Electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce collision sound between an armature plate and a rotor contact surface, in an electromagnetic clutch wherein power is transmitted by joining the armature and the rotor in a body in such a way that the armature plate is attracted toward the contact surface of the rotor by magnetic force of an electromagnetic coil. SOLUTION: In the electromagnetic clutch wherein the power is transmitted by joining the armature 9 and the rotor 6 in such a way that the armature plate 110 is attracted to the contact surface 6a of the rotor 6 by the magnetic force of the electromagnetic coil 4, the armature plate 110 is formed by laminating a plurality of sheet metals 111 provided with irregularities of dimple shape, elongated aperture shape, mesh shape and the like on one or both sides thereof, and the laminated metal sheets 111 are bonded together by welding at several points P1, P2, P3, Q1, Q3 thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch used for a compressor of an air conditioner for an automobile.

[0002]

2. Description of the Related Art FIG. 6 shows an example of a conventional electromagnetic clutch mounted on a compressor of a vehicle air conditioner. In FIG. 6, reference numeral 1 denotes a compressor of an automotive air conditioner, and the compressor 1 has an electromagnetic clutch 2 for connecting and disconnecting a driving force. The electromagnetic clutch 2 includes a coil assembly 3 having a built-in electromagnetic coil 4 fastened to and fixed to a front housing 5 of the compressor 1, a rotor 6 having a belt pulley 7 on an outer peripheral portion and rotatably supported by a bearing 8, And a hub 1 coupled to an armature plate 10 and a drive shaft 15 of the compressor 1
2 and the like. There is a slight gap between the rotor 6 and the coil assembly 3, and the rotatable rotor 6 contains the coil assembly 3 fixed to the front housing 5.

[0003] The amateur plate 10 of the amateur 9 and the hub 1
2 is integrally connected via an armature connection plate 11 having one end connected to the hub 12 by a plurality of rivets 14 and the other end connected to the armature plate 10 by a plurality of rivets 13. 8 is a bearing.

When the electromagnetic coil 4 of the electromagnetic clutch 2 is energized by turning on the operation switch of the air conditioner for a vehicle having the compressor 1 equipped with the electromagnetic clutch 2 configured as described above, the magnetic force of the electromagnetic coil 4 causes The amateur plate 10 of the amateur 9 is attracted to the contact surface 6a of the rotor 6, and the amateur 9 and the rotor 6 are integrally connected. In the coupled state of the electromagnetic clutch 2, the power of the vehicle engine from the belt pulley 7 of the rotor 6 is transmitted to the drive shaft 15 of the compressor 1 via the armature plate 10 and the hub 12, and the compressor 1 is operated. You.

[0005] In the above, the armature plate 10 attracted by the magnetic force of the electromagnetic coil 4 of the electromagnetic clutch 2 is coupled with the contact surface 6a at a high speed in order to minimize relative slip between the armature plate 10 and the contact surface 6a of the rotor 6. At this time, amateur plate 1
Since the contact surface 6a of the rotor 0 and the contact surface 6a are made of metal, there is a problem that a collision sound between the armature plate 10 and the contact surface 6a is generated, and the noise inside the vehicle increases.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an electromagnetic clutch in which an armature plate is attracted to a contact surface of a rotor by a magnetic force of an electromagnetic coil to integrally couple an armature and a rotor to transmit power. An object of the present invention is to reduce a collision sound when coupling with a rotor.

[0007]

In order to solve the above-mentioned problems, the present invention provides an amateur plate which is attracted toward a rotor by a magnetic force of an electromagnetic coil, comprising a plurality of thin plates having intentional irregularities on one or both surfaces. Provided is an electromagnetic clutch formed by laminating metals.

In the armature plate used in the electromagnetic clutch of the present invention, a minute gap is formed between the sheet metals by the unevenness provided on one or both sides of the sheet metal constituting the armature plate, and an air layer is formed there. Exists.
Thus, when the armature plate is attracted by the magnetic force toward the contact surface of the rotor and each of the laminated sheet metals comes into close contact with each other, the respective sheet metals are deformed to change the thickness of the entire armature plate and provide cushioning properties. be able to. Thus, the armature plate used in the electromagnetic clutch of the present invention has a low contact spring constant when it collides with the rotor, and can reduce the collision noise.

Further, when a plurality of laminated sheet metals of the armature plate employed in the electromagnetic clutch of the present invention are attracted to the rotor by the magnetic force and deformed, the adjacent sheet metals come into contact with each other to cause friction. Causes attenuation. As described above, in the electromagnetic clutch according to the present invention, when the armature plate contacts the contact surface of the rotor, the collision sound can be reduced by the cushioning effect of the air layer and the frictional damping at the contact surface.

As the irregularities intentionally provided on one or both sides of a plurality of sheet metals used in the electromagnetic clutch according to the present invention, dimples, slots, grooves, meshes, and the like can be employed. In this way, by selecting the shape and size of the irregularities provided on the sheet metal, it is possible to form an air layer with a small gap of the intended size between the laminated sheet metals, thereby reliably reducing the collision sound. Can be.

Further, in the electromagnetic clutch according to the present invention, an armature plate having a structure in which a plurality of thin metal sheets laminated as described above, for example, a plurality of outer peripheral portions are welded and bonded to each other is adopted. Is preferred. As described above, by forming a structure in which a plurality of thin metal sheets forming an armature plate are welded and bonded to each other, when torque is transmitted from the rotor through this armature plate, the welding of the plurality of metal sheets and the thin metal sheet are performed. The friction between them can effectively attenuate the collision force, and the collision noise can be further reduced.

In the electromagnetic clutch according to the present invention, the sheet metal constituting the armature plate is 0.3 to 1 mm each.
Thick ones may be used. The electromagnetic clutch of the present invention described above is suitable for use in a drive system that transmits a driving force to a drive shaft of a compressor in a compressor of an air conditioner for a vehicle.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electromagnetic clutch according to the present invention will be described in detail with reference to an embodiment shown in FIGS. 1 and 2, reference numeral 110 denotes an armature plate used for an electromagnetic clutch according to an embodiment of the present invention. This amateur plate 110 has a structure in which a plurality of thin metal sheets 111 (thickness of about 0.3 to 1.0 mm) are laminated, and a plurality of outer peripheral portions (three positions P1, P2, and P3 in the example of the drawing), And a plurality of locations (two locations Q1 and Q2 in the example in the figure) of the inner peripheral portion are bonded by welding.

The amateur plate 110 is provided with a connection hole 112 for connection with an amateur connection plate at a circumferential interval.
Are plural (three places in the example in the figure) and the amateur plate 11
A plurality (three in the example in the figure) of the long holes 113 for preventing distortion are drilled. This amateur plate 110 is shown in FIG.
As in the case of the armature plate 10 of the conventional electromagnetic clutch shown in FIG. 1, the armature is integrally connected to the hub 12 via the armature connection plate 11.

FIG. 3 is an enlarged view of a portion where the sheet metal 111 is laminated (portion B in FIG. 2). In this embodiment, an air layer 121 is formed between the thin plates depending on the degree of overlap of the dimples 120 provided on each of the thin plate metals 111. FIG. 4 is an image showing an example of the unevenness provided on the donut-shaped thin metal sheet 111. There are no restrictions on the height or number of the irregularities. FIG. 4A shows an example in which the dimples 120 are radially arranged. FIG. 4B shows an example in which the elongated holes 122 are radially arranged. FIG. 4 (c)
Is an example in which the entire surface is formed into a mesh 123.

Factors that determine the magnitude of the collision noise generated when the armature plate is attracted to the contact surface 6a of the rotor 6 and the two contact each other include the contact spring constant between the armature plate and the rotor 6 and the strength of the damping. The lower the contact spring constant,
In addition, a larger attenuation is advantageous in reducing the collision sound.

When a magnetic attraction is applied from the rotor 6 in a state in which the sheet metals 111 constituting the armature plates are stacked as shown in FIG. 3, the sheet metals 111 are attracted in the direction of the rotor 6 and finally the contact surface 6a of the rotor 6 Collide with Compared with the total thickness (T ₀ ) before the collision, the thickness (T ₁ ) after the complete adsorption is smaller by the amount of the air layer 120 between the sheet metals 111. Since the time from contact of the sheet metal 111 to the rotor 6 to complete adsorption is about 5 to 10 ms, the sheet metal 111 is adsorbed (collised) with cushioning properties.

FIG. 5 shows a decrease curve of the thickness when a compressive force is applied to the armature plate. In the laminated plate in the state shown in FIG.
Since 21 disappears, there is a sharp decrease in thickness. On the other hand, in the case of an amateur plate which is not formed of a conventional laminated plate, the thickness reduction with respect to the compressive force is minute and linear. In this way, the laminated plate has a low contact spring constant at the moment of collision with the rotor 6. Further, considering the structural damping, the armature plate 110 formed of a laminated plate is formed of a laminated plate because, when the thin sheet metal 111 is deformed by receiving an impact force, the adjacent thin sheet metals 111 come into contact with each other and cause frictional damping. The attenuation is greater than that of a conventional amateur plate.

Another aspect of the electromagnetic clutch of the present embodiment is as follows.
One effect is to increase the coefficient of static friction between the laminated sheet metals 111. As described above, the sheet metal 111 is provided at a plurality of locations on the outer peripheral portion (in this embodiment, P1, P2, P3
Three locations) and a plurality of locations on the inner periphery (in the example, Q1,
Q2) are formed by welding and bonding. With this configuration, the torque transmission from the rotor 6 to the hub 12 is performed by welding the inner and outer peripheral portions and the sheet metal 1.
11 contribute. By the above operation, in the electromagnetic clutch according to the present embodiment, the collision sound between the armature 9 and the rotor 6 can be reduced.

As described above, the present invention has been specifically described based on one embodiment shown in the drawings. However, the present invention is not limited to these embodiments, and within the scope of the present invention shown in the claims,
It goes without saying that various changes may be made to the specific structure and configuration.

For example, in the illustrated embodiment, the dimples 120 are formed so as to have irregularities on both surfaces of the sheet metal 111. However, the dimples 120 may be formed with depressions and protrusions on only one surface. . Furthermore, in the illustrated embodiment, a plurality of positions (P
1, P2, P3, Q1, Q2) are welded and bonded, but such welding is not always necessary.

[0022]

As described above, according to the present invention, an armature plate attracted toward a rotor by the magnetic force of an electromagnetic coil is formed by laminating a plurality of thin metal sheets having intentional irregularities on one or both surfaces. The present invention provides an electromagnetic clutch formed by:
As described above, the armature plate employed in the electromagnetic clutch of the present invention has a small gap formed between the sheet metals due to the unevenness provided on one or both sides of the sheet metal, and an air layer exists there. I have.

The armature plate thus constructed is magnetically attracted toward the contact surface of the rotor, and when each of the laminated sheet metals comes into close contact with each other, the respective sheet metals may be deformed to give a desired cushioning property. it can. Thus, the armature plate used in the electromagnetic clutch of the present invention has a low contact spring constant when it collides with the rotor, so that the collision noise can be reliably reduced. Further, when a plurality of laminated sheet metals in the armature plate employed by the electromagnetic clutch of the present invention are attracted toward the rotor and deformed, adjacent sheet metals come into contact with each other to cause frictional damping, resulting in collision. Sound can be reduced.

On one or both surfaces of a plurality of sheet metals used in the electromagnetic clutch according to the present invention, dimples, slots, grooves, meshes, and other appropriate shapes and sizes of irregularities are selectively provided. Thereby, an air layer is formed by a minute gap having an intended size between the laminated thin metal sheets, and the collision sound can be reliably reduced.

Further, in the electromagnetic clutch according to the present invention, in the case where an armature plate having a structure in which a plurality of portions of the laminated sheet metal are welded and the sheet metal is bonded as described above is used, the armature plate is interposed. When transmitting torque from the rotor, the friction between the welds and the sheet metal at the plurality of locations effectively attenuates the collision force and can reduce the collision noise better.

By using the electromagnetic clutch of the present invention in a drive system for transmitting a driving force to a drive shaft of a compressor in a vehicle air conditioner compressor, it is possible to provide a vehicle air conditioner with reduced vehicle interior noise.

[Brief description of the drawings]

FIG. 1 is a plan view of an armature plate constituting an electromagnetic clutch according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is an enlarged sectional view of a portion B in FIG. 2;

FIGS. 4A and 4B are explanatory diagrams showing examples of irregularities on an armature plate constituting an electromagnetic clutch according to the present invention, wherein FIG. 4A is a diagram in which dimples are radially arranged, FIG. c) shows a mesh.

FIG. 5 is a graph showing a thickness reduction curve when a compressive force is applied to an armature plate used in the electromagnetic clutch of the present invention, in comparison with a conventional armature plate.

FIG. 6 is a cross-sectional side view showing a configuration of a conventional electromagnetic clutch mounted on a compressor of an air conditioner for a vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Electromagnetic clutch 3 Coil assembly 4 Electromagnetic coil 5 Front housing 6 Rotor 6a Contact surface 7 Belt pulley 8 Bearing 9 Amateur 10 Amateur plate 11 Amateur connection plate 12 Hub 13 Rivets 14 Rivets 15 Drive shaft 110 Amateur plate 111 Thin metal 112 Connection hole 120 Dimple 121 Air layer 122 Slot 123 Network

Claims (5)

[Claims] 1. An electromagnetic clutch in which an armature plate is attracted to a contact surface of a rotor by a magnetic force of an electromagnetic coil to integrally couple an armature and a rotor to transmit power, and the armature plate is intentionally provided on one side or both sides. An electromagnetic clutch formed by laminating a plurality of thin metal sheets provided with various irregularities. 2. The method according to claim 1, wherein the unevenness is any one of a dimple shape, a long hole shape, a groove shape, and a mesh shape.
The electromagnetic clutch according to 1. 3. The electromagnetic clutch according to claim 1, wherein a plurality of portions of the laminated sheet metal are welded and bonded. 4. The electromagnetic clutch according to claim 1, wherein said sheet metal has a thickness of 0.3 to 1 mm. 5. An air conditioner compressor for an automobile, wherein a drive shaft of the compressor is driven via the electromagnetic clutch according to any one of claims 1 to 4.