JP2003240018A - Electromagnetic clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent increase of slippage time and reduction of transmitting torque by preventing sticking of an armature plate and a rotor friction surface of an electromagnetic clutch. <P>SOLUTION: The armature plate 110 of the electromagnetic clutch has an outer disk plate part 118 and an inner disk plate part 119 combined at a disk combing part 20 and slit 117 to effectively form a magnetic path provided on a center line of a circular shape of the combining part 20 to form the friction surface 110a. A plurality of grooves 120 curving in a rotating direction are provided from an inner diameter side toward an outer diameter side on the friction surface. The friction surface 110a rotates while slipping on a friction surface of the rotor and actively shaves off sticking component of facing material generated on the rotor friction surface to maintain the surface in a normal condition and prevent sticking. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electromagnetic clutch, and more particularly, it is used in a compressor of an automobile air conditioner and has an effect of preventing sticking of a friction surface and a decrease in transmission torque.

[0002]

2. Description of the Related Art An example of a conventional electromagnetic clutch installed in a compressor of an air conditioner for an automobile will be described with reference to FIGS. FIG. 3 is a sectional view of the compressor, and FIG. 4 is a detailed view of a portion B in FIG. In FIGS. 3 and 4, an electromagnetic clutch 2 of a compressor 1 of an air conditioner for an automobile includes a coil assembly 3 having a built-in coil 4 fastened and fixed to a front housing 5 of the compressor 1, and an outer peripheral portion of the coil assembly 3. A rotor 6 having a rotatable belt pulley 7, an armature plate 10, and a hub 1 connected to a drive shaft 15 of the compressor 1.
It consists of two amateurs 9 and the like.

The amateur plate 10 and the hub 12 of the present amateur 9 are connected to the hub 12 by a plurality of rivets 14 at one end and via a connection plate 11 at the other end connected to the amateur plate 10 by a plurality of rivets 13. Are connected together. Facing (friction material) 16 is embedded and mounted on a part of the friction surface 6a of the rotor 6 over the entire circumference, and this friction surface 6a is the friction surface 10a of the amateur plate 10 of the amateur 9 and the illustration thereof is omitted. However, it is held with an air gap of a small gap length. Further, the amateur plate 10 is formed with a plurality of slits 117 in the circumferential direction in order to effectively form a magnetic path.

A case where the compressor 1 is operated in the above structure will be described below. When the coil 4 of the electromagnetic clutch 2 is excited by the operation switch or the control sequence ON of the automobile air conditioner, the magnetic force of the coil 4 causes the friction surface 10a of the armature plate 10 of the armature 9 to rotate the rotor 6
The friction surface 6a is deformed in the axial direction by the elastic force and is attracted, so that the armature 9 and the rotor 6 are integrally connected. In the engaged state of the electromagnetic clutch 2, the power of the automobile engine is transferred from the belt pulley 7 of the rotor 6 connected to the drive pulley of the automobile engine via the belt to the compressor 1 via the armature plate 10 and the hub 12. The compressor 1 is operated by being transmitted to the drive shaft 15.

In the above structure, the rotor 6 is connected to the automobile engine via the belt pulley 7 and is always rotating, and is attracted to the friction surface 6a of the rotor 6 by the operation switch or the control sequence ON of the air conditioner. The friction surface 10a of the stationary amateur plate 10 is connected to the friction surface 6a of the rotor 6 until it reaches the same speed as the rotor 6 which is connected to the automobile engine via a belt before being in the coupled state and is constantly rotating. I will come in contact with them while sliding.

[0006]

In the electromagnetic clutch described above, when the armature plate 10 of the armature 9 is slipping, it is embedded and mounted in the friction surface 6a of the rotor 6 due to the rise in heat generation temperature due to the slip. Although the friction material of the facing 16 will be fixed,
If this sticking product is not removed, the amateur 9
There is a problem that the sliding time of the amateur plate 10 (time until it becomes a coupled state) increases and the transmission torque of the electromagnetic clutch 2 decreases.

In view of this, the present invention has a structure of a sliding surface that eliminates the sticking component of the facing material on the rotor friction surface that is generated when the friction surface between the armature plate and the rotor is slipping, and the sticking component is generated. It is an object of the present invention to provide an electromagnetic clutch in which the surface of the facing material is made to be in a normal state each time to prevent sticking and increase in slip time and decrease in transmission torque.

[0008]

The present invention provides the following means for solving the above-mentioned problems.

(1) The electromagnetic coil is excited by a switch operation or a control sequence operation, and the magnetic force of the electromagnetic coil attracts the armature plate of the amateur to the friction surface of the rotor with the facing embedded therein, and the armature and the rotor. In the electromagnetic clutch capable of maintaining the integrally connected state and transmitting the rotational force, the friction surface of the armature plate that comes into contact with the friction surface of the rotor extends from the inner diameter side to the outer diameter side of the friction surface. A plurality of grooves are provided on the electromagnetic clutch.

(2) The electromagnetic clutch according to (1), characterized in that the electromagnetic clutch is incorporated in a compressor of an air conditioner for an automobile and transmits a driving force to the compressor.

In (1) of the present invention, when the electromagnetic coil is excited by the operation of the switch or the operation of the control sequence, the armature plate is attracted to the friction surface of the rotor. In this process, before the armature plate and the rotor are integrally joined, the friction surface of the armature plate makes sliding contact with the friction surface of the rotor until the friction surface of the rotor is rotating at the same speed as the friction surface of the rotor. To go. In the process of this slippage, heat is generated due to the slippage, and due to the temperature rise of the rotor friction surface, the fixing material of the facing material embedded in the rotor friction surface occurs. This sticking is the time when the friction surface of the amateur plate is in a state of being connected with the rotor friction surface, that is,
This causes an increase in sliding time of the armature plate and a decrease in transmission torque due to a decrease in facing frictional force. In (1) of the present invention, since the plurality of grooves provided in the armature plate positively scrape off the fixed component of the facing material generated on the friction surface of the rotor, the surface portion of the facing material is returned to the normal state. It is possible to prevent sticking, prevent an increase in sliding time of the amateur plate due to sticking, and prevent a decrease in transmission torque.

According to the second aspect of the present invention, since the electromagnetic clutch is incorporated in the compressor of the automobile air conditioner, the coil of the electromagnetic clutch is excited by the operation switch of the automobile air conditioner or the control sequence being turned on, and the amateur The friction surface of the plate is in sliding contact with the friction surface of the rotor, which is connected to an automobile engine by a belt or the like, and is constantly rotating until it comes to the same speed. In this process, the plurality of grooves scrape away the fixed component of the facing material generated on the friction surface of the rotor as in the case of the above-mentioned invention (1), so that the same effect as that of the above-mentioned invention (1) can be obtained.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a partial cross-sectional view of an electromagnetic clutch according to an embodiment of the present invention and is a view corresponding to the conventional cross-sectional view shown in FIG. In the figure, an electromagnetic clutch 102 of the present invention is shown as an amateur 109.
The armature plate 110 has a structure in which a friction surface 110a provided with a groove 120 is formed as will be described later, and the structure of other compressors is the same as that of the conventional example described in FIGS. The detailed description will be omitted and the same reference numerals will be used for the description.

FIG. 2 is a view on arrow AA in FIG.
The friction surface of the armature plate 110 is shown. The armature plate 110 is held with a surface having a facing (friction material) 16 embedded in a part of the friction surface 6a of the rotor 6 over the entire circumference and an air gap having a predetermined small gap length. The facing material 16 is embedded so as to be flush with the friction surface 6a, but may be slightly projected.

The armature plate 110 has a structure in which it is divided into an outer disc portion 118 and an inner disc portion 119 as shown in FIG. Is forming. Like the conventional electromagnetic clutch 2, a plurality of slits 1 are provided along the center line of the same circle including the joint portion 20 of the outer disc portion 118 and the inner disc portion 119.
17 are provided with a space between the disc joints 20.
The slit 117 is provided to effectively form a magnetic path between the rotor 6 and the armature plate 110. It should be noted that this amateur plate 110 may not be divided into the outer disc portion 118 and the inner disc portion 119, but may be an integral disc, and the slit 117 may be formed in this integral disc.

Further, the friction surface 110 of the amateur plate 110
A has a plurality of grooves 120 that are curved in the rotation direction (indicated by arrows) from the inner diameter side to the outer diameter side of the armature plate 110. The groove 120 is 5 in the illustrated example.
Although shown in the example of a book, it is not limited to five,
The number may be 5 or more, or 5 or less. The depth of the groove may be set, for example, by setting an appropriate value for the depth of the armature plate 110 in consideration of a decrease due to friction with respect to the thickness of the amateur plate 110.

In the above structure, the coil 4 of the electromagnetic clutch 102 is excited by the operation switch of the automobile air conditioner or the control sequence of this air conditioner is turned on, and the armature plate 110 of the armature 109 is attracted to the rotor 6 to be connected to the rotor 6. The friction surface 110a of the amateur plate 110 is connected to the friction surface 6a of the rotor 6 until it reaches the same speed as the friction surface 6a of the rotor 6 which is connected to an automobile engine via a belt and is constantly rotating. And slip and make contact.

In the process in which the friction surface 110a of the amateur plate 110 and the friction surface 6a of the rotor 6 are slipping,
Due to this slippage, heat is generated, and the temperature of the friction surface 6a of the rotor 6 rises, so that the facing 16 material embedded in the friction surface 6a of the rotor 6 is fixed. Rotor 6
The permanent fixation that occurs on the friction surface 6a of the
Of the friction surface 110a of the rotor 6 and the friction surface 6a of the rotor 6, that is, the sliding time of the armature plate 110 increases, and the transmission torque decreases due to a decrease in the frictional force of the facing 16 material.

In the embodiment of the present invention, the amateur plate 1
The plurality of grooves 120 curved in the rotation direction from the inner diameter side to the outer diameter side of the amateur plate 110 provided on the friction surface 110a of the rotor 10 are formed by the sliding between the friction surface 6a and the friction surface of the rotor 6 during rotation. 6a, the adhered component of the facing 16 material is positively shaved and the surface portion of the facing 16 material is restored to the normal state each time it occurs, so that the facing 16 material adheres to the friction surface 6a of the rotor 6 It is possible to prevent the slip time of 110 from increasing and the transmission torque of the electromagnetic clutch 102 from decreasing.

In the present embodiment, an example of a compressor for an automobile air conditioner has been described, but the compressor of the present invention is not limited to an automobile, and may be used as a drive mechanism for a rotating body of other mechanical devices. It is used as an electromagnetic clutch and has the same effect.

[0021]

The electromagnetic clutch of the present invention (1) excites the electromagnetic coil by the operation of the switch and the control sequence, and the magnetic force of the electromagnetic coil causes the armature plate of the amateur to be mounted on the friction surface of the rotor with the facing installed. In an electromagnetic clutch capable of attracting and maintaining the integrally coupled state of the armature and the rotor and transmitting a rotational force, a friction surface of the armature plate that contacts the friction surface of the rotor A plurality of grooves are provided from the inner diameter side to the outer diameter side.

With the above structure, the friction surface of the armature plate and the friction surface of the rotor come into contact with each other while sliding, and in the process in which this sliding occurs, heat is generated with the sliding,
Due to the temperature rise of the rotor friction surface, the fixing material of the facing material embedded in the rotor friction surface occurs, but in the present invention,
A plurality of grooves provided on the armature plate positively scrapes the adhered component of the facing material generated on the friction surface of the rotor and restores the surface part of the facing to the normal state, thus preventing adherence and It is possible to prevent the slip time from increasing and the transmission torque from decreasing.

In the second aspect of the present invention, since the electromagnetic clutch is incorporated in the compressor of the automobile air conditioner, the coil of the electromagnetic clutch is excited by the operation switch of the automobile air conditioner or the control sequence being turned on, and the amateur The friction surface of the plate is in sliding contact with the friction surface of the rotor, which is connected to an automobile engine by a belt or the like, and is constantly rotating until it comes to the same speed. In this process, the plurality of grooves scrape away the fixed component of the facing material generated on the friction surface of the rotor as in the case of the above-mentioned invention (1), so that the same effect as that of the above-mentioned invention (1) can be obtained.

[Brief description of drawings]

FIG. 1 is a main part sectional view of an electromagnetic clutch according to an embodiment of the present invention.

FIG. 2 is a view on arrow AA in FIG.

FIG. 3 is a cross-sectional view of a conventional electromagnetic clutch provided in a compressor of an air conditioning system for automobiles.

4 is an enlarged detailed view of a B part in FIG.

[Explanation of symbols]

3 coil assembly 4 coils 5 Front housing 6 rotor 6a, 110a Friction surface 7 Belt pulley 12 ribs 13,14 Rivet 15 drive shaft 16 facings 102 electromagnetic clutch 109 amateur 110 amateur board 117 slits 118 Outer disk part 119 Inner disk part 120 grooves

Claims (2)

[Claims] 1. An electromagnetic coil is excited by a switch operation or a control sequence operation, and the magnetic force of the electromagnetic coil attracts an armature plate of an armature to a friction surface of a rotor having a facing embedded therein, thereby separating the armature from the rotor. In an electromagnetic clutch capable of maintaining the integrally connected state and transmitting a rotational force, a friction surface of the armature plate that contacts the friction surface of the rotor is provided from the inner diameter side to the outer diameter side of the friction surface. An electromagnetic clutch having a plurality of grooves. 2. The electromagnetic clutch according to claim 1, wherein the electromagnetic clutch is incorporated in a compressor of an air conditioner for an automobile, and a driving force is transmitted to the compressor.