JPH0624587Y2 - Electromagnetic clutch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention mainly relates to an electromagnetic clutch device for connecting and disconnecting power transmission to a refrigerant compressor of an air conditioner.

[Prior Art] Conventionally, as shown in FIG. 8, the electromagnetic clutch device 100 has a rotor 120 having an exciting coil 110 and an annular armature 130. The armature 130 is different from the rotor 120. It can be moved in the direction of contact and separation. A plate hub 140 having a flange portion 141 is attached to the armature 130, and an inner hub 160 having a flange portion 161 is coaxially arranged on the plate hub 140 via a cushion rubber 150. The inner hub 160 is connected to the refrigerant compressor via a rotating shaft 170.

Further, in the electromagnetic clutch device 100, an axial reaction force is generated in the cushion rubber 150 by pressing the end 151 of the cushion rubber 150 between the armature 130 and the inner hub 160.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional electromagnetic clutch device 100, the flange portion 141 of the plate hub 140 and the flange portion 161 of the inner hub 160 are extended in a direction away from the armature 130. The axial length is large. This electromagnetic clutch device is poor in mountability in the engine room due to the recent shift to a front engine / front drive of automobiles and an increase in auxiliary machinery, and it is necessary to reduce the size.

Therefore, as shown in FIG. 9, by utilizing the existence of a space in the inner periphery of the armature 230, the armature 230, the flange portion 241 of the plate hub 240, the cushion rubber 250, and the flange portion 261 of the inner hub 260 are coaxial. An electromagnetic clutch device 200 arranged above and having a reduced axial length can be considered.

However, in this electromagnetic clutch device 200, the cushion rubber 250 is not pressure-contacted between the armature 230 and the inner hub 260, and as shown in the graph of FIG. 10, no axial reaction force is generated in the cushion rubber 250. There was a problem of poor vibration resistance.

An object of the present invention is to provide an electromagnetic clutch device capable of shortening the axial length and improving the vibration resistance of cushion rubber.

[Means for Solving the Problems] An electromagnetic clutch device of the present invention includes a rotor having an annular plate-shaped friction surface, a rotary shaft arranged coaxially with the rotor, and a friction surface of the rotor. An annular armature having an annular plate-shaped friction surface disposed so as to be separably opposed to each other; an excitation coil for pressing the armature into a friction surface of the rotor when energized; and a circle fixed to the armature. An annular outer plate portion, a cylindrical flange portion that extends so as to be located inside the inner peripheral edge of the armature from the inner peripheral edge of the outer plate portion, and fold inward in the radial direction from the rotor side end of the flange portion. A plate hub having a bent portion, a hub portion connected to the rotating shaft, and a flange portion of the plate hub are arranged so as to face the flange portion of the plate hub from an outer peripheral edge of the hub portion. Has a tubular flange Inner hub, and is arranged between the flange portion of the plate hub and the flange portion of the inner hub, and is fixed to the opposing surfaces of both flange portions, and the bent portion of the plate hub presses the hub portion of the inner hub. By adopting this, a technical means including a cushion rubber to which a reaction force in the axial direction is applied is adopted. ”Is corrected.

[Operation] The electromagnetic clutch device of the present invention has the following operation with the above configuration.

Since the flange portion of the plate hub and the flange portion of the inner hub are arranged inside the inner peripheral edge of the armature, the armature, the plate hub, the cushion rubber, and the inner hub are arranged in the radial direction, and the axial direction of the electromagnetic clutch device. The length can be shortened.

Due to the elastic force of the cushion rubber itself, the bent portion of the plate hub presses the hub portion of the inner hub, so that a reaction force in the axial direction is applied to the cushion rubber. Therefore, the axial force applied to the cushion rubber is reduced by the reaction force applied to the cushion rubber against the axial deformation force of the cushion rubber, so that the vibration resistance of the cushion rubber is improved.

When the exciting coil is energized, the friction surface of the armature is pressed against the friction surface of the rotor. At this time, the cushion rubber is
Since it is fixed to both flanges of the plate hub and inner hub, it flexes in the axial direction by the gap between the rotor and the armature, and the load of the rotating shaft (or rotor) impacts in the rotating direction via the inner hub (or plate hub). Join in. Therefore, the cushion rubber is further twisted in the rotational direction while being bent in the axial direction to absorb the impact force and transmit the driving force to the rotating shaft (or the rotor).

When the excitation coil is de-energized, the armature returns to its original position due to the contracting force of the cushion rubber, and the transmission of rotation to the rotating shaft (or rotor) is cut off. At this time, the cushion rubber absorbs the impact force when the armature and the plate hub return.

[Effect of the Invention] The electromagnetic clutch device of the present invention has the following effects due to the above configuration and operation.

Since the armature, the plate hub, the cushion rubber, and the inner hub are arranged in the radial direction, the axial length can be shortened and the electromagnetic clutch device can be downsized.

Also, since the elastic force of the cushion rubber itself presses the bent portion of the plate hub toward the hub portion of the inner hub, an axial reaction force can be applied to the cushion rubber.
The durability of the cushion rubber against the axial deformation force can be improved. Moreover, since the number of parts can be reduced, the production cost of the electromagnetic clutch device can be reduced.

[Embodiment] An embodiment of the electromagnetic clutch device of the present invention will be described with reference to the drawings.

1 and 2 show the first embodiment of the electromagnetic clutch device of the present invention.
1 shows an electromagnetic clutch device for connecting and disconnecting a refrigerant compressor and an engine of an air conditioner for a vehicle to which an embodiment is applied.

Reference numeral 1 denotes an electromagnetic clutch device. Reference numeral 2 denotes a stator housing made of a magnetic material.

Inside the stator housing 2, an exciting coil 3 wound in a cylindrical shape inside a plastic winding body 31 is disposed. The winding body 31 is fixed to the stator housing 2 by caulking. The exciting coil 3 is connected to an external power source and forms a magnetic circuit 32 when energized as shown by the broken line in FIG. A mounting flange portion 21 is joined to the stator housing 2, and is fixed to the housing (not shown) of the refrigerant compressor via the mounting flange portion 21.

4 indicates a rotor in which the pulley 41 is joined by welding,
It is rotatably mounted on the housing of the refrigerant compressor via a bearing 42. Reference numeral 5 denotes an annular armature, which is made of a magnetic material (for example, iron-based metal such as S10C of low carbon steel having a carbon content of 0.3% or less), and has an annular plate-shaped friction surface of the rotor 4.
An annular plate-shaped friction surface 51 is provided on 43 so as to face each other so as to be able to approach and separate with a narrow gap. A plate hub 6 is fixed to the armature 5 with three rivets 52. Here, 53 in FIG. 2 shows a magnetic path forming hole.

As shown in FIGS. 3 and 4, the plate hub 6 is formed into a predetermined shape by pressing or cold forging, and is an annular outer plate portion fixed to the friction surface 51 and the opposite side surface of the armature 5. 61, a cylindrical flange portion 63 extending so as to be located inside the inner peripheral edge 54 of the armature 5 from the inner peripheral edge 62 of the outer plate portion 61, and radially inward from the rotor side end 64 of the flange portion 63. It has three claws 65 that are bent portions. A groove 66 for facilitating bending of the claw portion 65 is formed at the rotor-side end 64 of the flange portion 63. The plate hub 6 is connected to the inner hub 7 via a cushion rubber 8.

The inner hub 7 is formed into a predetermined shape by pressing or cold forging, and is arranged so that the hub portion 71 and the outer peripheral edge 72 of the hub portion 71 face the plate hub 6 to the flange portion 63 with a predetermined gap. The cylindrical flange portion 73 is formed. The hub portion 71 is fixed to the rotary shaft 9 that drives the refrigerant compressor via a hub 91 that is integral with the hub portion 71.

The cushion rubber 8 is made of butyl rubber (11R), natural rubber (NR), or the like, which has excellent vibration resistance and heat resistance and has a large rubber hardness, and has a cylindrical shape. The cushion rubber 8 is arranged between the flange portion 63 of the plate hub 6 and the flange portion 73 of the inner hub 7, and is vulcanized and adhered to the opposing surfaces of the flange portions 63, 73. Further, the cushion rubber 8 has a stopper portion 81 of the plate hub 6 which is a rubber member extended.

The stopper portion 81 has an annular shape and is a hub portion of the inner hub 7.
It is fixed to the outer peripheral edge 72 of the 71, and extends from the cushion rubber 8 so as to correspond to the hub portion 71 of the inner hub 7 and the claw portion 65. The stopper portion 81 absorbs the impact sound when the armature 5 returns. Further, the stopper portion 81 prevents the claw portion 65 of the plate hub 6 from excessively moving in the direction away from the rotor 4, and the friction surface 43 of the rotor 4 and the friction surface 51 of the armature 5 are prevented.
Has a function of giving the cushion rubber 8 a flexure in the axial direction when pressed.

The cushion rubber 8 reduces the torsional shock load transmitted to the refrigerant compressor when the exciting coil 3 is energized and restores the armature 5 to its original position when the exciting coil 3 is de-energized. Has the effect of causing.

Here, the plate hub 6 and the inner hub 7 and the cushion rubber 8 are vulcanized and adhered as follows.

First, an adhesive is applied to the bonding surfaces of the plate hub 6 and the inner hub 7, that is, the facing surfaces of the flange portions 63 and 73.
The flange portions 63, 73 of the plate hub 6 and the inner hub 7 thus coated with the adhesive are placed in the mold with a predetermined gap. Then, the cushion rubber 8 which has not been vulcanized is filled between the flange portion 63 and the flange portion 73 in the mold, and thereafter, the mold is clamped and heated, and the plate hub 6 and the inner hub 7 and the cushion are bonded with the adhesive. The cushion rubber 8 is formed into a predetermined shape while being bonded to the rubber 8. Further, after the vulcanization and adhesion, the claw portion 65 of the plate hub 6 is bent inward in the radial direction from the rotor side end 64, and the claw portion 65 of the plate hub 6 is inserted through the stopper portion 81 of the cushion rubber 8. By pressing the hub portion 71, the reaction force in the axial direction is applied to the cushion rubber 8.

The operation of the electromagnetic clutch device 1 of the present invention is shown in FIGS.
A description will be given based on the figure.

As shown in FIG. 1, the stopper portion 81 of the cushion rubber 8
Since the claw portion 65 of the plate hub 6 presses the hub portion 71 of the inner hub 7 via the shaft, a reaction force in the axial direction is applied to the cushion rubber 8, and thus the vibration resistance of the cushion rubber 8 is improved. That is, due to the elastic force of the cushion rubber 8 itself, the bent portion of the plate hub 6 presses the hub portion 71 of the inner hub 7 against the cushion rubber 8 to give a reaction force in the axial direction of the cushion rubber 8. Therefore, the axial reaction force applied to the cushion rubber 8 against the axial deformation force of the cushion rubber 8 reduces the axial stress applied to the cushion rubber 8. Vibration resistance can be improved.

At the time of starting the refrigerant compressor, when the exciting coil 3 is transmitted, a magnetic circuit 32 shown by a broken line in FIG. 1 is formed, and the armature 5 receives a force to be attracted to the rotor 4. As a result, the cushion rubber 8 elastically bends, and the armature 5
Moves in the axial direction together with the plate hub 6 and is adsorbed to the friction surface 43 of the rotor 4 as shown in FIG. At this time, the cushion rubber 8 is bent in the axial direction by the gap between the rotor 4 and the armature 5.

Since the rotor 4 is driven by the engine via the pulley 41 and the belt (not shown), when the rotor 4 and the armature 5 are attracted, the driving force thereof is
The rotation of the armature 5 is transmitted to the plate hub 6 via the rivet 9 and further transmitted to the refrigerant compressor via the cushion rubber 8, the inner hub 7 and the rotating shaft 9 in this order.

At this time, since the refrigerant compressor is still stopped, the inner hub 7 is stationary due to the load due to the load such as the rotating shaft 9 that drives the refrigerant compressor and the moment of inertia. Therefore, the driving force of the rotor 4 received through the plate hub 6 and the force due to the moment of inertia of the inner hub 7 in the stationary state are shocked to the cushion rubber 8 and twisted in the rotation (twisting) direction. However, since the cushion rubber 8 of the present invention has improved vibration resistance, the cushion rubber 8 can be rotated in the axially bent state while being further twisted in the rotational direction while relaxing the impact force due to the load on the rotating shaft 9. The driving force is transmitted to the shaft 9.

When the excitation coil 3 is de-energized, the armature 5
Due to the contracting force of the cushion rubber 8, the cushion rubber 8 returns to its original position, and the transmission of rotation to the rotating shaft 9 is blocked. At this time,
The armature 5 is prevented from excessively moving in the direction away from the rotor 4 by the stopper portion 81 of the cushion rubber 8, and the return position of the armature 5 is determined. Further, the cushion rubber 8 reduces the impact force when the armature 5 and the plate hub 6 return.

Here, the flange portion 73 of the plate hub 6 and the flange portion 73 of the inner hub 7 are provided inside the inner peripheral edge 54 of the armature 5.
Since the armature 5, the flange portion 63 of the plate hub 6, the cushion rubber 8, and the flange portion 73 of the inner hub 7 are arranged in the radial direction, the axial length of the electromagnetic clutch device 1 is shortened. be able to.

Therefore, the electromagnetic clutch device 1 can be downsized, and the cushion rubber 8 can be given a reaction force in the axial direction to improve the durability of the cushion rubber 8 against the deformation force in the axial direction. Further, since the stopper portion 81 prevents the claw portion 65 of the plate hub 6 from excessively moving in the direction away from the rotor 4, the stopper portion 81 collides with other members such as the armature 5 and the inner hub 7 of the plate hub 6 and the housing. Alternatively, damage due to contact can be prevented.

The graph of FIG. 6 is the result of the durability test of the electromagnetic clutch device 1 of the present embodiment, and shows the number of interruptions (the number of cycles) until the cushion rubber cracks. As is clear from this graph, the load torque is 1.5 Kgm, and there is durability against axial deformation force of 10,000 cycles or more.

Here, ◯ indicates the electromagnetic clutch device 1 using butyl rubber for the cushion rubber 8, and Δ indicates the electromagnetic clutch device 1 using butyl rubber for the cushion rubber 8.

FIG. 7 shows a second embodiment of the electromagnetic clutch device of the present invention.

(Functions having the same functions as those in the first embodiment are designated by the same reference numerals.) Generally, in order to improve the durability of the cushion rubber 8 against the axial deformation force, the amount of rubber strain when receiving the axial deformation force should be reduced. Good. Therefore, if the rubber hardness of the cushion rubber 8 is increased, the spring constant in the torsional direction of the surface of the cushion rubber 8 is increased and the spring constant in the axial direction is also increased. The durability against the deformation force in the direction is also improved.

However, the electromagnetic clutch device 1 has a restriction on the spring constant in the contact / separation direction of the armature 5 (axial direction of the rotary shaft 9), and when the rubber hardness of the cushion rubber 8 is improved, the spring constant in the axial direction also rises, The armature 5 is no longer sucked, and the durability of the cushion rubber 8 against a desired axial deformation force cannot be obtained.

Therefore, in this embodiment, the rubber hardness of the cushion rubber 8 is improved and the plate hub 6 is made of a spring steel plate. The outer plate portion 61 of the plate hub 6 is a flange portion.
The plate hub 6 extends radially from 63 toward the three rivets 52, forms a substantially Y shape, and the plate hub 6 acts as a leaf spring. Therefore, while the rubber hardness of the cushion rubber 8 is improved, the spring constant in the axial direction is made substantially the same as that of the first embodiment by the plate hub 6, and the rotor 4 and the armature 5 are provided.
The adsorption action with and is not excluded.

[Modification] In this embodiment, the bent portion of the plate hub is the claw portion.
The bent portion of the plate hub may be formed in an annular shape.

In this embodiment, the stopper portion of the cushion rubber, which is a rubber member, is integrally formed, but it may be formed separately, and the rubber member may not be provided. When the rubber member is not provided, the bent portion of the plate hub may be configured so that the bent portion of the plate hub directly presses the inner hub.

Further, the place where the stopper portion is formed is not limited to this embodiment as long as it has a function of absorbing the impact sound when the armature is returned. For example, a rubber member may be fixed to the claw portion of the plate hub.

Further, the place where the stopper portion is formed is not limited to this embodiment as long as it has a function of preventing the tab portion of the plate hub from moving excessively in the direction away from the rotor.

In this embodiment, the armature and the plate hub are formed separately, but the armature and the plate hub may be integrally formed.

In this embodiment, the inner hub is integrally formed with the hub of the rotary shaft, but the inner hub and the hub may be formed separately.

In addition, in concrete implementation, the application target of the electromagnetic clutch device of the present invention is not limited to the refrigerant compressor of the air conditioner, and may be applied to a supercharger, that is, a supercharger, within the scope of the invention. Can be changed variously.

For example, in this embodiment, the rotor is connected to the drive source and the rotation shaft is connected to the driven member, but the rotation shaft may be connected to the drive source and the rotor may be connected to the driven member.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a first embodiment of an electromagnetic clutch device of the present invention when an exciting coil is energized, FIG. 2 is a front view showing a first embodiment of the electromagnetic clutch device of the present invention, and FIG. FIG. 4 is a front view showing a plate hub used in the first embodiment of the electromagnetic clutch device of the present invention, FIG. 4 is a sectional view taken along line AA of FIG.
FIG. 5 is a side sectional view showing the electromagnetic clutch device according to the first embodiment of the present invention when the excitation coil is not energized, and FIG. 6 shows the load torque and the cushion rubber according to the first embodiment of the electromagnetic clutch device of the present invention. FIG. 7 is a front view showing a second embodiment of the electromagnetic clutch device of the present invention, FIG. 8 is a side sectional view showing a conventional electromagnetic clutch device, and FIG. FIG. 10 is a side sectional view showing a conventional electromagnetic clutch device, and FIG. 10 is a graph showing the relationship between the displacement of the cushion rubber and the load. In the figure, 1 ... Electromagnetic clutch device, 3 ... Excitation coil, 4 ... Rotor,
5 ... annular armature, 6 ... plate hub, 7 ... inner hub, 8 ... cushion rubber, 9 ... rotating shaft, 43 ... friction surface,
51 ... Friction surface, 61 ... Outer plate portion, 62 ... Inner peripheral edge, 63 ... Flange portion, 64 ... Rotor side end, 65 ... Claw portion (folded portion), 71 ... Hub portion, 72 ... Outer peripheral edge, 73 ... Flange Section, 81 ... Stopper section

Claims (3)

[Scope of utility model registration request] 1. A rotor having (a) an annular plate-shaped friction surface, (b) a rotary shaft arranged coaxially with the rotor, and (c) a friction surface of the rotor which is opposed to and is separable from the friction surface. A ring-shaped armature having a ring-shaped plate-shaped friction surface, and (d) an exciting coil that presses the armature into a friction surface of the rotor when energized, and (e) is fixed to the armature. A circular annular outer plate portion, a cylindrical flange portion extending so as to be located inside the inner peripheral edge of the armature from the inner peripheral edge of the outer plate portion, and radially inward from the rotor side end of the flange portion. A plate hub having a bent portion bent in the direction of (f), a hub portion connected to the rotating shaft, and an outer peripheral edge of the hub portion facing the flange portion of the plate hub with a predetermined gap therebetween. An inner hub having a tubular flange portion arranged in such a manner that (g) the plate hub It is arranged between the lunge portion and the flange portion of the inner hub, and is fixed to the opposing surfaces of the both flange portions, and the bent portion of the plate hub presses the hub portion of the inner hub, so that the axial reaction is prevented. An electromagnetic clutch device including a cushion rubber to which force is applied. 2. A utility model registration claim characterized in that a rubber member for absorbing an impact sound when the armature is returned is interposed between the bent portion of the plate hub and the hub portion of the inner hub. The electromagnetic clutch device according to the first section. 3. The bent portion of the plate hub is a plurality of claw portions that are layered with the hub portion of the inner hub in the axial direction, and the rubber member is formed from the cushion rubber to the hub portion of the inner hub and the plurality of claw portions. The electromagnetic clutch device according to claim 2, wherein the electromagnetic clutch device is extended corresponding to the claw portion of the utility model.