JP2000120791A - Damper device for electromagnetic clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of a damper device during torque transmission, to reduce noises during clutch-meeting and to improve axial operability of an armature. SOLUTION: This damper device has a hub 71, an outer ring 72 fixed to an armature 6, and a damper main body 73 made of elastomer, arranged on an uneven surface 71d of the hub 71 and axially movably engaged with an uneven surface 72d of the outer ring 72. The damper main body 73 has a projection 73b in press-contact with an inner peripheral diametral portion 72c of the outer ring 72 for generating compressive repulsion in the direction for separating the armature 6 from a rotor 2. Lubricant 8 is arranged between the damper main body 73 and the uneven surface 72d of the outer ring 72. In the clutch-meeting state where the armature 6 is in close contact with the rotor 2, torque transmission is carried out in a compressive manner between the uneven surface 71d of the hub 71 and the uneven surface 72d of the outer ring 72 opposed thereto in a circumferential direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper device provided in various electromagnetic clutches for absorbing a contact sound at the time of a clutch meet and transmitting torque between a clutch plate and a boss.

[0002]

2. Description of the Related Art An electromagnetic clutch of a compressor for compressing a refrigerant in a refrigeration cycle of an air conditioner for an automobile is conventionally provided with a damper device as shown in FIG. That is, FIG. 4 shows a damper device according to the prior art together with a part of an electromagnetic clutch. This electromagnetic clutch is composed of a non-rotating electromagnetic coil 101 and a shaft hole housing 103 of a compressor which is arranged so as to surround the coil. A rotor 102 rotatably held on the outer periphery via a bearing 104 and having a V pulley 102a formed on the outer periphery.
And an armature 106 that is closely opposed to the end face of the rotor 102. The armature 106 is held by a rotating shaft 105 inserted through the shaft hole housing 103 via a damper device 107 so as to be movable in the axial direction.

[0003] A damper device 107 includes a hub 107a attached to the outer periphery of the tip of a rotating shaft 105, and a hub 10a.
An outer ring 107b is attached to the armature 106 and is disposed on the outer peripheral side of the outer ring 7a, and a damper body 107c made of an annular elastomer that is vulcanized and bonded between opposing peripheral surfaces of the outer ring 107b and the hub 107a. The damper device 107 has a function of transmitting torque from the armature 106 attracted to the rotating rotor 102 to the rotating shaft 105 by exciting the electromagnetic coil 101 and an armature when the exciting current to the electromagnetic coil 101 is cut off. A spring function for urging the rotor 106 away from the end face of the rotor 102 by an axial distance L, and an armature 10 that is excited by the electromagnetic coil 101.
6 has a function of reducing clutch meet sound with the rotor 102.

[0004]

The following problems are pointed out in the above-mentioned prior art electromagnetic damper device for an electromagnetic clutch. That is, from the viewpoint of improving the durability of the damper device 107 when transmitting torque from the armature 106 to the rotating shaft 105, it is desirable to increase the rigidity of the damper body 107c in the torsional direction. However, the damper body 107c is a shear spring in both the torsional direction and the axial direction, and increasing the torsional rigidity also increases the axial rigidity. In order to attract the armature 106, it is necessary to increase the voltage of the electromagnetic coil 101 and increase the size of the electromagnetic coil 101, and this has the problem that the clutch meet sound becomes loud.

SUMMARY OF THE INVENTION The present invention has been made under the above circumstances, and its technical subjects are to improve the durability of a damper device at the time of torque transmission, and to provide a clutch-meeting sound reducing function. It is to improve the axial operability of an armature.

[0006]

Means for Solving the Problems The technical problems described above are:
This can be effectively solved by the present invention. That is, the electromagnetic clutch damper device according to the present invention is provided with a hub provided on the rotating shaft and having an uneven surface radially undulating at predetermined intervals in the circumferential direction, and fixed to the armature side so as to correspond to the uneven surface of the hub. An outer ring having an uneven surface that is undulated in the radial direction; and an outer ring that is integrally provided on the uneven surface of the hub and is axially movably engaged with the uneven surface of the outer ring via an appropriate gap. A damper main body made of an elastomer, and a projection which generates a compression reaction force in a direction in which the armature is separated from the rotor by being pressed against the outer ring. In this configuration, more preferably,
A lubricant is interposed in a gap between the damper body and the uneven surface of the outer ring, and is sealed by a part of the damper body.

[0007] According to the above configuration, the armature is attracted to the end face of the rotor by magnetic force when the electromagnetic coil is energized, and when the exciting current to the electromagnetic coil is cut off, the armature of the damper body pressed against the outer ring on the armature side. It separates from the end face of a rotor by a compression reaction force. Accordingly, the outer ring and the hub relatively move in the axial direction in a state where the outer ring and the hub engage with each other via the damper body.

In the process in which the outer ring moves in the axial direction together with the armature to the rotor side, the armature does not receive the rotational torque from the rotor, so that a circumferential pressing force is applied between the damper body and the uneven surface of the outer ring. Does not work. In addition, the projection of the damper body that is compressed by the axial movement of the outer ring together with the armature toward the rotor is a non-linear spring, and its initial compression reaction force is small. Therefore, the armature can easily move in the axial direction. In particular, by interposing a lubricant between the damper body and the uneven surface of the outer ring, it becomes possible to move more smoothly. Further, in the process of moving the armature to the position where the armature comes into contact with the end face of the rotor, the compression reaction force of the protrusion increases non-linearly, so that the clutch meet sound is effectively reduced.

In a state where the armature is attracted to the end face of the rotor by the magnetic force of the electromagnetic coil, rotational torque is transmitted between the rotor and the rotating shaft via the armature, the outer ring, the damper body and the hub. At this time, the damper body made of the elastomer receives the torque by compression between the concave and convex surface of the hub and the concave and convex surface of the outer ring circumferentially facing the hub, so that the rigidity becomes high and the durability is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a typical embodiment of a damper device for an electromagnetic clutch according to the present invention, together with a part of an electromagnetic clutch. In this electromagnetic clutch, reference numeral 1 denotes a non-rotating electromagnetic coil, and reference numeral 2 denotes a rotor made of a magnetic material disposed so as to surround the electromagnetic coil 1 and having a V pulley 21 formed on the outer periphery. The rotor 2
A compressor of an air conditioner for an automobile is rotatably held on the outer periphery of a shaft hole housing 3 via a bearing 4. Also, on the inner periphery of the shaft hole housing 3,
A rotating shaft 5 for operating a refrigerant compression mechanism (not shown) in the compressor is inserted therethrough.

Reference numeral 6 denotes a disk-shaped armature made of a magnetic material, which is disposed so as to be in close proximity to the end face 22 of the rotor 2, and which has the tip of the rotating shaft 5 protruding from the outer end opening of the shaft hole housing 3. It is held on the outer peripheral side via a damper device 7 according to an embodiment of the present invention so as to be axially movable. The damper device 7 is integrally vulcanized and bonded to a hub 71 attached to a tip end of the rotary shaft 5 via a bolt 51, an outer ring 72 attached to the armature 6, and an outer peripheral portion of the hub 71. And a damper body 73 made of an elastomer.

The hub 71 has an inner boss 71a fixed to the rotating shaft 5, a disk 71b radially expanded from the outer end thereof, and an axially outward projection from the outer periphery of the disk 71b. And an outer peripheral edge 71c. The disk part 71
b is located outside the inner peripheral portion of the end face 22 of the rotor 2,
The inner peripheral portion of the armature 6 is located between the inner peripheral portion of the rotor 2 and the disk portion 71b of the hub 71. As shown in FIG. 2A, which is a partial cross-sectional view taken along the line AA 'in FIG. 1, the outer peripheral protruding edge portion 71c has an outer peripheral surface that is raised and lowered in a radial direction at predetermined intervals in a circumferential direction. Irregular surface 71d
It has become. The rotating shaft 5 and the hub 71 are connected to the key 52
The relative rotation is prevented through the connection.

The outer ring 72 has an outer peripheral flange 72 fixed to the outer peripheral portion of the end face of the armature 6 on the side opposite to the rotor 2 via a plurality of rivets 74 in the circumferential direction.
a from the inner peripheral end of the outer peripheral flange portion 72a.
An axial portion 72b extending outwardly in the axial direction from the outer peripheral edge 71c of the outer peripheral edge 71c, and an inner peripheral flange extending axially outward from the axial direction portion 72b toward the inner peripheral side of the outer peripheral edge 71c. 2A and 2B, and the axial direction portion 72b has an outer peripheral edge 7 of the hub 71 as shown in FIGS.
It is formed in a concavo-convex shape undulating in the radial direction so as to correspond to the concavo-convex surface 71d of 1c, that is, has a concavo-convex surface 72d.

A damper body 73 made of an elastomer
Are vulcanized and bonded to both surfaces of the hub 71 from a portion near the outer periphery of the disk portion 71b to the outer peripheral protruding portion 71c. Of these, the portion vulcanized and bonded to the outer peripheral side of the outer peripheral protruding portion 71c of the hub 71 is FIG. 2 in which a part of FIG.
As shown in (B), an engagement having an uneven shape that is undulated in the radial direction such that the outer peripheral surface is movably engaged with the uneven surface 72d of the outer ring 72 through a small sliding gap G in the axial direction. It is a part 73a. The hub 71
The portion of the outer peripheral protruding portion 71c vulcanized and bonded to the inner peripheral side protrudes outward in the axial direction and has
A protruding portion 73b that is always in close contact with the inner side surface of the second inner peripheral flange portion 72c is formed.

A projection 73b formed on the damper body 73
When the armature 6 is magnetically attracted to the end face 22 side of the rotor 2 by applying an exciting current to the electromagnetic coil 1 and is displaced in the axial direction, the inner peripheral flange of the outer ring 72 displaced integrally with the armature 6 Part 72c
The armature 6 is compressed in the axial direction by the
Generates a compression reaction force that urges the end surface 22 away from the end surface 22. Therefore, the protrusion 73b is provided as shown in FIG.
As shown in (A), a non-linear spring whose spring constant (reaction force) is small at the time of initial displacement with a small amount of axial compression, and whose spring constant increases nonlinearly (ideally a quadratic curve) with an increase in displacement. It has the following characteristics.

When the armature 6 is located at a position separated from the end face 22 of the rotor 2 by an axial distance L by the compression reaction force of the projection 73b, the inner peripheral flange 72c of the outer ring 72 and the outer peripheral projection of the hub 71 are provided. The end faces of the edge 71c face each other with an axial distance larger than the axial distance L. Therefore, the clutch meet between the armature 6 and the end face 22 of the rotor 2 due to the excitation of the electromagnetic coil 1 is reduced.
The inner peripheral flange portion 72c and the outer peripheral projecting edge portion 71c do not interfere with each other.

The damper body 73 has a diaphragm portion 73c formed on the outer periphery thereof at an end of the engagement portion 73a on the armature 6 side, and a second projection 73d formed on the inner periphery side. I have. The diaphragm part 73c
Of the armature 6 and the outer ring 72
And the second protrusion 73d is tightly sandwiched between the outer peripheral flange 72a and the second protrusion 73d.
When the armature 6 is separated from the end face 22 of the rotor 2 by the axial distance L due to the compression reaction force of the third projection 73b, the armature 6 comes into contact with the end face of the armature 6 on the side opposite to the rotor 2.

A lubricant 8 such as grease is sealed in a gap between the inner peripheral flange 72c of the outer ring 72 whose inner periphery is sealed by the projection 73b and the end surface of the outer peripheral ridge 71c of the hub 71. And a part of the lubricant 8 is
It is interposed in the sliding gap G between the engaging portion 73a of the damper body 73 and the axial portion 72b (the uneven surface 72d) of the outer ring 72. The leakage of the lubricant 8 from the sliding gap G to the armature 6 side is caused by the diaphragm 73
c.

Next, the operation of the damper device 7 according to the present embodiment configured as described above will be described together with the operation of the electromagnetic clutch.

First, the rotor 2 has a V pulley 2
The engine 1 is rotated by a driving force from a crank pulley of the engine or the like via a belt (not shown) wound around the motor 1. When an exciting current is applied to the electromagnetic coil 1 from the state shown in FIG. 1, the armature 6 moves in the axial direction toward the rotor 2 due to the magnetic force and is attracted to the end face 22, and the clutch meets the state. The rotational torque is transmitted from the armature 6 to the rotary shaft 5 via the outer ring 72 of the damper device 7, the damper body 73, and the hub 71, and the compressor enters an operating state. At this time, the engaging portion 73a of the damper body 73 made of an elastomer is
The uneven surface 71d of the outer peripheral protruding portion 71c and the axial portion 72b of the outer ring 72 circumferentially facing the uneven surface 71d.
4 receives the torque by compression between the concave and convex surface 72d, and has high rigidity, and the durability at the time of torque transmission is remarkably improved as compared with the conventional structure of FIG.

In the process of moving the armature 6 in the axial direction toward the rotor 2, the uneven surface 72 d of the outer ring 72 that moves in the axial direction integrally with the armature 6
3 is slid in the axial direction on the outer circumference of the engaging portion 73a, but the space between the axial portions 72b and 73a is lubricated by the intervention of the lubricant 8, and further, until the clutch meets state, the rotor 2 Since the rotational torque does not press the concave-convex surface 72d of the axial portion 72b of the outer ring 72 and the engaging portion 73a of the damper body 73 in the circumferential direction, the sliding resistance is extremely small. Further, the displacement force of the armature 6 toward the rotor 2 due to the magnetic force exhibits a characteristic as shown in FIG. 3B, so that the displacement force due to the magnetic force is small in the initial stage of the displacement, but the protrusion 73 b of the damper body 73 is As shown in FIG. 3A described above, this is a non-linear spring by compression, and the reaction force at the initial stage of displacement is extremely small. Therefore, even if the applied voltage and the size (the number of turns, etc.) of the electromagnetic coil 1 are relatively small, the armature 6 can easily move in the axial direction toward the rotor 2.

3A and 3B, as the armature 6 approaches the end face 22 of the rotor 2 (L decreases), the axial direction of the armature 6 toward the rotor 2 by magnetic force. Although the displacement force increases nonlinearly, the compression reaction force of the protrusion 73b of the damper body 73 also increases nonlinearly with the displacement, so that the shock when the armature 6 clutches the end face 22 of the rotor 2 is reduced. That is, the clutch meet sound is effectively reduced.

Next, when the exciting current to the electromagnetic coil 1 is cut off from the clutch-meeting state, the reaction force of the projection 73b of the damper body 73 which has been compressed by the inner peripheral flange 72c of the outer ring 72 causes The armature 6 is returned to the side opposite to the rotor 2 via the outer ring 72. As a result, the clutch meet state is eliminated, the transmission of the rotational torque from the rotor 2 via the armature 2 is interrupted, and the rotation of the rotary shaft 5 is stopped.

In the return operation process of the armature 6, similarly to the movement in the clutch meet direction described above,
The axial portion 72b of the outer ring 72 is
Slide smoothly in the axial direction on the outer periphery of the engaging portion 73a. The return operation is stopped when the armature 6 is separated from the end face 22 of the rotor 2 by the axial distance L and comes into contact with the second projection 73d of the damper body 73, so that the contact with the hub 71 is prevented. Is done.

[0025]

As described above, according to the damper device for an electromagnetic clutch according to the present invention, since the damper body made of the elastomer receives the transmission torque between the hub and the outer ring by the circumferential compression, It becomes rigid, and the torque transmission force in the damper body can be improved. Also, since the outer ring and the hub are relatively movably engaged via the damper body, the armature can move smoothly in the axial direction, thereby reducing the excitation voltage of the electromagnetic coil and reducing the electromagnetic coil. The size can be reduced. Therefore, it is possible to achieve both improvement of the durability of the damper main body against the torque transmission and securing of the axial operability of the armature. In addition, the non-linear spring characteristic of the projection of the damper body that urges the armature to the side opposite to the rotor makes it possible to ensure both the axial operability of the armature and the effect of reducing clutch meet noise.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a typical embodiment of a damper device for an electromagnetic clutch according to the present invention, together with a part of an electromagnetic clutch.

FIGS. 2A and 2B show a part of the damper device according to the embodiment, wherein FIG. 2A is a partial sectional view taken along line AA ′ in FIG. 1, and FIG. 2B is an enlarged view of a part of FIG. It is sectional drawing.

FIG. 3 is a diagram illustrating characteristics according to the embodiment.

FIG. 4 shows a damper device for an electromagnetic clutch according to the related art,
FIG. 3 is a half sectional view showing a part of the electromagnetic clutch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic coil 2 Rotor 21 V pulley 22 End face 3 Shaft hole housing 4 Bearing 5 Rotating shaft 51 Bolt 52 Key 6 Armature 7 Damper device 71 Hub 71a Boss portion 71b Disk portion 71c Outer peripheral edge portion 71d, 72d Uneven surface 72a Outer flange portion 72b Axial portion 72c Inner flange portion 73 Damper body 73a Engagement portion 73b Projection 73c Diaphragm 73d Second projection 74 74 Rivets 8 Lubricant G Sliding gap (gap)

Claims (2)

[Claims] An armature (6) axially approaching and facing an end face (22) of a rotor (2) surrounding an electromagnetic coil (1), and is arranged concentrically with said rotor (2). A damper device (7) interposed between the rotary shaft (5) and a hub provided on the rotary shaft (5) and having a concave and convex surface (71d) that is radially undulated at predetermined circumferential intervals. (71), the hub (71) fixed to the armature (6) side.
An outer ring (72) having an uneven surface (72d) undulating in the radial direction so as to correspond to the uneven surface (71d) of the hub; and the outer ring (71d) provided integrally with the uneven surface (71d) of the hub (71). The uneven surface (72) of the ring (72)
For d), a damper body (73) made of an elastomer engaged movably in the axial direction through an appropriate gap (G).
The damper body (73) includes the outer ring (7).
A damper device for an electromagnetic clutch, wherein a projection (73b) for generating a compression reaction force in a direction of pressing the armature (6) away from the rotor (2) by pressing against the rotor (2) is formed. 2. The damper body (73) according to claim 1, wherein a lubricant (8) is interposed in a gap (G) between the damper body (73) and the uneven surface (72d) of the outer ring (72). 73) A damper device for an electromagnetic clutch, wherein the damper device is hermetically sealed at a part.