JPH022010B2 - - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a crack near a sticking part by placing a buffer elastic member between a plate and an armature to absorb a shock due to attraction and the torsional vibration of a rotating shaft. CONSTITUTION:When voltage is applied to an exciting coil, an armature 43 is attracted to the sticking plane of a rotor 24 as it elastically deforms a damper rubber 42 in a compressive direction to transmit the rotation of a pulley 25 to a rotating shaft 33. In this case, shock occurring simultaneously with the sticking of the armature 43 to the rotor 24 is absorbed by the elastic deformation of the damper rubber 42 in an axial direction. Consequently, the torsional vibration of the rotating shaft 33 lessens to control quick torque transition, thus a crack near a sticked part can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electromagnetic coupling device used in an electromagnetic clutch for transmitting power, an electromagnetic brake for braking power, etc. This invention relates to a damper rubber type electromagnetic coupling device that is most suitable as a vehicle electromagnetic coupling device that is attached to machinery that is connected to the vehicle.

[Conventional technology]

This type of electromagnetic coupling device has been known, for example, the one disclosed in Japanese Utility Model Publication No. 58-8997, etc., but in such an electromagnetic coupling device, coupling and braking are performed slowly. Although it has advantages, it generates hitting noise due to the contact of connecting members when connecting and disconnecting, and it is not possible to reduce the noise.
No. 173022 (Utility Model Application Publication No. 61-89526) proposes a solution that eliminates these drawbacks, and the third
The figure shows a longitudinal sectional view, and FIG. 4 shows a front view. In the figure, an electromagnetic clutch 1 as an electromagnetic coupling device mounted on a vehicle compressor consists of a stopper plate 4 supported on a rotary shaft 2 of the compressor via an armature hub 3, and a bearing mounted on a front nose 5 of the compressor. A mounting flange 10 fixed to the side surface of the front housing 8 of the compressor with screws 9 includes an annular excitation coil 11 and a rotor 7 for holding the rotor 7. An excitation device 13 consisting of a core 12 is fixed. This excitation device 13 is inserted into an annular space formed by a pulley 14 fixed to the rotor 7 and a boss of the rotor 7.
4 is connected to the crankshaft by a belt (not shown) stretched across the V-groove. On the other hand, damper rubbers 16 are fitted into damper covers 15 welded to positions dividing the outer circumferential portion of the stopper plate 4 into three equal parts in the circumferential direction, and each damper rubber 16 has a rivet 17. It is inserted from the outside and fixed by baking etc. An armature 18 is formed into a disc shape and is disposed between the stopper plate 4 and the rotor 7, and is fixedly supported by the rivet 17, and between the armature 18 and each damper rubber 16. is the stopper rubber piece 1 fixed to the armature 18 by baking etc.
9 is inserted into the through hole of the stopper plate 4. A plurality of demagnetizing parts 20 are provided in the rotor 7 and are used to divert magnetic flux generated around the excitation coil 11 to the armature 18 by excitation of the excitation coil 11.

With this configuration, when the excitation coil 11 shown in the figure is demagnetized, the damper rubber 16
Since the armature 18 fixed to the side is spaced apart from the rotor 7, even if the pulley 14 is driven and rotated from the crankshaft side, the rotation is not transmitted to the rotating shaft 2. When a voltage is applied to the excitation coil 11 from this state, the armature 18 is attracted to the attraction surface of the rotor 7 while elastically deforming the damper rubber 16 in the compression direction, and the rotation of the pulley 14 is transmitted to the rotating shaft 2. In this case, the impact that occurs at the moment when the armature 18 is attracted to the rotor 7 is absorbed by the elastic deformation of the damper rubber 16 in the axial and circumferential directions. Furthermore, when the excitation of the excitation coil 11 is released from this state, the adsorption of the armature 18 to the rotor 7 is released, and the damper rubber 16, which was compressed at this moment, elastically returns to its original state, causing the armature 18 to move outward. The power is cut off. In this case, since the stopper rubber 19 is provided between the armature 18 and the stopper plate 4, the hitting sound when the armature 18 comes into contact with the stopper plate 4 is eliminated.

[Problem that the invention seeks to solve]

In this way, the electromagnetic clutch shown in FIGS. 3 and 4 absorbs shock during torque transmission by providing the damper rubber 16, reduces torsional vibration of the rotating shaft 2, and suppresses sudden torque rise. This has the features of the damper rubber type, and the provision of the stopper rubber 19 has the feature of eliminating unpleasant noises when the power transmission is disconnected; however, the following problems remain. There is.

That is, this electromagnetic clutch uses a torsional damper method in which the damper cover 15 is welded to the stopper plate 4 and the damper rubber 16 is integrated therewith by vulcanization solidification or press fitting. The processing method involves welding the damper cover 15 as a separate member, which not only has poor workability but also may cause variations in the quality of the welded portion. Furthermore, since the stopper plate 4 supports the armature 18 and is subject to a torque load, the designed wall thickness must be thick enough to withstand mechanical strength. The weight of the output side rotating member including the output side becomes heavy. Therefore, if this electromagnetic clutch is mounted on a rotating shaft 2 that rotates while receiving a periodically fluctuating load, as in a compressor, for example, this load fluctuation will further increase, and the electromagnetic clutch itself will suffer. There is a problem in that it not only deteriorates the operating characteristics but also affects its peripheral equipment.

Further, the damper rubber 16 filled in the circular damper cover 15 is loaded with excessive torque during driving, and the leading side in the rotational direction is compressed and the lagging side in the rotational direction is expanded, so that the damper rubber 16 is compressed near the bonded part of the rivet 17. However, there is a problem in that cracks occur due to the relationship between the volume of the damper rubber 16 and its elongation rate and tensile stress. Furthermore, since the stopper plate 4 and the armature hub 3, which are supporting members of the armature 18, are installed in close proximity to the magnetic flux path of the excitation coil 11 consisting of the field core 12, the rotor 6, and the armature 18, Magnetic flux leaks to the member, and the magnetic attraction force of the armature 18 decreases.

[Means for solving problems]

In order to solve such problems, the present invention includes an armature support member that is mounted on the rotating shaft and supports the armature so as to be movable in the axial direction.
It is formed by a hub and an annular plate made of non-magnetic material fixed to the flange of the hub. An annular space surrounded by a peripheral wall is provided, the inside of which is filled with an elastic member, and a buffering elastic member is interposed between the plate and the armature, and an opening on the armature side of the inner peripheral wall is closed. The bottom plate and armature were attached with rivets.

[Effect]

When the excitation coil is excited, the armature is attracted and power is transmitted to the rotating shaft, and when the excitation coil is de-energized, the armature is released from the attraction and power transmission is cut off. When transmitting such power, the elastic member filled in the annular space is elastically deformed in the axial and circumferential directions, thereby absorbing the shock and torsional vibration. Since it is long in the circumferential direction,
The elastic action is increased, and if the plate and the outer circumferential wall are integrally formed by aluminum die-casting or the like, production is easy and magnetic flux does not leak. Furthermore, the shock-absorbing elastic member eliminates the armature hitting sound when the power transmission is disconnected.

〔Example〕

1 and 2 show an example in which the electromagnetic coupling device according to the present invention is implemented as an electromagnetic clutch in a compressor for a vehicle; FIG. 1 is a longitudinal sectional view thereof, and FIG. 2 is a front view thereof. In the figure, electromagnetic clutch 2
1 includes a rotor 24 rotatably supported by a front nose 22 of the compressor via a bearing 23, and a pulley 25 having a V-groove 25a is integrally fixed to the rotor 24. and,
A belt is stretched between the pulley 25 and a pulley on a crankshaft (not shown). Furthermore, an excitation device 31 consisting of an annular excitation coil 29 and a field core 30 that holds it is fixed to a mounting flange 28 fixed to the end face of the front housing 26 of the compressor with screws 27. The device 31 is inserted into an annular space formed between the inner peripheral surface of the pulley 25 and the outer peripheral surface of the boss portion of the rotor 22 . 32 is a lead wire connecting the excitation coil 29 and the power source.

On the other hand, the rotary shaft 33 of the compressor has a symbol 3 as a whole.
An armature hub 35, which is a component of the armature support member indicated by 4, is screwed into the threaded end portion, and is fixed with its movement in the axial direction restricted by a bolt 37 screwed in through a washer 36. The armature support member 34 has a plurality of rivets 38 on the armature hub 35 and the flange.
A plate 40 made of non-magnetic material is integrally fixed with
In this embodiment, the plate 4
0 is formed by die-casting aluminum and is formed into a triangular shape to reduce weight. On the same circumference of the outer circumference of the plate 40, an outer circumferential wall 40a formed in a substantially oval shape that is elongated in the circumferential direction is integrally molded at the same time as the die-casting of the plate 40 at a location that divides the plate into substantially equal parts in the circumferential direction. The portion surrounded by the outer peripheral wall 40a is a hole. Furthermore, an inner cover 41 is disposed within the outer circumferential wall 40a, and is integrally formed with an inner circumferential wall 41a having a substantially similar shape to the inner circumferential wall 41a, and a bottom plate 41b that closes an opening on the armature 43 (described later) side. An annular space 40b surrounded by the wall 40a and the inner circumferential wall 41a is filled with damper rubber 42 as an elastic member by vulcanization and solidification.
As a result, the outer peripheral wall 40a and the inner cover 41 are integrated by the damper rubber 42. 43
is a disc-shaped armature disposed between the rotor 24 and the inside of the plate 40, and between the armature and the plate 40 is a cushioning elastic material made of an elastic material such as rubber. A plurality of stopper rubbers 44 are inserted,
Each of the inner covers 41, washers 41c, and armature 43 are integrally caulked and fixed with rivets 45. And stopper rubber 4
4 is integrally formed with the damper rubber 42 when the damper rubber 42 is vulcanized into the annular space 40b. Note that both ends of the annular space portion 40b do not necessarily have to be arcuate, and may be linear. 4
A plurality of 6 and 47 are provided in the rotor 24 and the armature 43 respectively, and the magnetic flux generated around the excitation coil 29 is transferred to the armature 4.
This is a demagnetizing part for detouring to No. 3.

The operation of the electromagnetic clutch configured as above will be explained. When the excitation coil 29 shown in the figure is demagnetized, the armature 43 fixed to the damper rubber 44 side is spaced apart from the rotor 24, so even if the pulley 25 is driven from the crankshaft side and rotates, the rotation is limited to the rotation axis. 33 is not transmitted.
When a voltage is applied to the excitation coil 29 from this state, the armature 43 is attracted to the attraction surface of the rotor 24 while elastically deforming the damper rubber 42 in the compression direction, and the rotation of the pulley 25 is transmitted to the rotating shaft 33. In this case, the armature 43 is connected to the rotor 24.
The shock that occurs at the moment when the damper rubber 4
The elastic deformation of damper rubber 42 in the axial direction reduces torsional vibration of rotary shaft 33, and the elastic deformation of damper rubber 42 in the circumferential direction reduces torsional vibration of rotary shaft 33, thereby suppressing a sudden torque rise. At this time, damper rubber 4
2 is formed into an oval shape so as to be elongated in the circumferential direction, the elastic action is increased and the damping effect against torsional vibration of the rotating shaft 33 is improved.

Furthermore, when the excitation coil 29 is de-energized from this state, the adsorption of the armature 43 to the rotor 24 is released, and the damper rubber 42, which was compressed at this moment, elastically restores itself, and the armature 4
3 moves outward to disconnect the power. In this case, by interposing the stopper rubber 44 between the armature 43 and the plate 40, the hitting sound when the armature 43 contacts the plate 40 is eliminated.

Note that the washer 41c provided at the caulked portion by the rivet 45 is not necessarily provided, and the inner peripheral wall 41a may be extended so that the bottom plate 41b directly contacts the armature 43. Further, although the above embodiments have shown examples in which the present invention is implemented as an electromagnetic clutch in a compressor for a vehicle, the type of equipment to be implemented is not limited, and the invention may also be implemented as an electromagnetic brake.

〔Effect of the invention〕

As is clear from the above description, in the electromagnetic coupling device according to the present invention, the armature support member, which is mounted on the rotating shaft and supports the armature so as to be movable in the axial direction, is connected to the hub and the non-contact member fixed to the flange thereof. Formed with an annular plate made of magnetic material,
An annular space surrounded by circumferentially long oval-shaped inner and outer peripheral walls is provided at multiple locations that divide the outer periphery of the plate approximately equally in the circumferential direction, and an elastic member is filled inside the annular space. , a buffering elastic member is interposed between the plate and the armature, and the armature is riveted to the bottom plate provided by closing the armature side opening of the inner peripheral wall, so that the plate of the armature support member can be fixed. Since it can be integrally formed by die-casting or the like, manufacturing becomes easy and workability is improved, and the weight of the rotating member is reduced and operating characteristics are improved. Furthermore, since the plate is made of a non-magnetic material, leakage of magnetic flux is reduced and the magnetic attraction force of the armature is increased. Furthermore, by forming the annular space and the elastic member filled therein to be elongated in the circumferential direction, the elastic action is increased, the buffering effect against torsional vibration of the rotating shaft is increased, and power transmission is performed smoothly. , the occurrence of cracks in the elastic member is reduced and the durability of the elastic member is improved. Further, since the elastic member does not have a rivet embedded therein, and instead has an inner circumferential wall, the adhesive area of the elastic member can be increased, and peeling of the elastic member can be prevented. Furthermore, since a cushioning elastic member was inserted between the armature and the plate side,
The impact when the armature returns is alleviated and the hitter is eliminated, reducing noise.

[Brief explanation of drawings]

1 and 2 show an embodiment of the electromagnetic coupling device according to the present invention, FIG. 1 is a longitudinal sectional view thereof, and FIG.
The figures are a front view, FIG. 3 is a longitudinal sectional view of the conventional electromagnetic coupling device, and FIG. 4 is a front view. 21... Electromagnetic clutch, 29... Excitation coil,
31... Excitation device, 33... Rotating shaft, 34... Armature support member, 35... Armature hub, 40... Plate, 40a... Outer periphery, 40
b... Annular space part, 41... Inner cover, 41
a... Inner peripheral wall, 41b... Bottom plate, 42... Damper rubber, 43... Armature, 44... Stopper rubber, 45... Rivet.

Claims (1)

[Claims] 1. An armature support member mounted on a rotating shaft, an elastic member provided on the outer periphery of the armature support member and movably supporting the armature facing inward in the axial direction, and a An electromagnetic coupling device comprising an excitation device that magnetically attracts the armature inward,
The armature support member is formed of a hub and an annular plate made of a non-magnetic material fixed to the flange thereof, and the outer periphery of this plate is divided approximately equally in the circumferential direction at a plurality of locations, the longer in the circumferential direction An annular space surrounded by oval-shaped inner and outer circumferential walls is provided, and the elastic member is filled in the annular space, and a buffering elastic member is interposed between the plate and the armature, and the armature of the inner circumferential wall is An electromagnetic coupling device characterized in that the armature is riveted to a bottom plate provided with a side opening closed.