JPS62165031A - Electromagnetic coupling device - Google Patents

Abstract

PURPOSE:To enable to form a plate as an integrated body through a die-casting method or the like so as to ease the production, by providing a recessed part, which is filled with an elastic member for supporting an armature, to the outside of the outer periphery of an annular plate, which is made of non-magnetic material, of an armature supporting member. CONSTITUTION:An armature supporting member 34 is formed with both an armature hub 35 and an annular plate 40, which is made of a non-mangetic material and which is fixed to the flange of the armature hub 35. On the outside of the outer peripheral part of this plate 40 are formed a plurality of recessed parts 40a, which are formed into an oval shape whose major axis is in the circumferential direction, through a die-casting method or the like so that the recessed parts 40a become one body with the plate 40. These recessed parts 40a are filled with a damper rubber 41 as an elastic member. In addition, a stopper rubber 44, that is a shock absorbing elastic member, is placed between an armature 43 and the plate 40 or the damper rubber 41.

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.
In particular, the present invention relates to a damper rubber type electromagnetic coupling device that is most suitable as a vehicle electromagnetic coupling device that is attached to the crankshaft of an internal combustion engine and machinery that is dynamically connected to the crankshaft.

[Conventional technology]

As an electromagnetic coupling device for this field, conventionally, for example,
The electromagnetic 4ti device disclosed in Publication No. 8997, etc., has the advantage of being able to perform connection and braking slowly, but on the other hand, loose connection between the members when pasting the connection is possible. Since a hitting sound is generated due to the contact between the two, and the noise cannot be reduced, the applicant had previously proposed a method to eliminate this drawback in Utility Application No. 59-173022, and Figure 4 is its longitudinal cross-sectional view, and Figure 5
The figure also shows a front view. In the figure, an electromagnetic clutch 1 as an electromagnetic coupling device installed in a compressor for vehicle width.
The compressor is equipped with a stopper plate 4 fully supported on the rotating shaft 2 of the compressor via an armature hub 3, and a rotor 7 rotatably supported on the front nose 5 of the compressor via a bearing 6. A mounting flange 10 fixed to the side surface of the front housing 8 of the compressor with screws 9 has an annular excitation coil 11 and a field core 12 that holds it.
An excitation device 13 consisting of is fixed. This excitation device 13i, J:, the pulley 14 fixed to the rotor 7
and the boss of the rotor 7, and the pulley 14 is inversely connected to the crankshaft (not shown) by a belt stretched across the V (-). Damper rubbers 16 are fitted into damper guides 15 welded to positions that divide the outer circumference of the plate 4 into three equal parts in the circumferential direction.
A rivet 17 is inserted from the outside and fixed by baking or the like. Reference numeral 18 denotes an armature formed in a disc shape and disposed between the stopper plate 4 and the rotor 7, and is fixedly supported by the rivet 1T, and between this armature 18 and each damper rubber 16. The rubber piece 19 is fixed to the armature 18 by baking etc.
is inserted into the through hole of the stopper plate 4. A plurality of holes 2o are provided in the rotor 7, and the magnetic flux generated around the excitation coil 11 is transferred to the armature 18.
There is a demagnetizing section for detouring the magnet.

With this configuration, when the excitation coil 11 shown in the figure is demagnetized, the armature 18 fixed to the damper rubber 16 side is separated from the rotor 7, so the pulley 14 is driven from the crankshaft side and rotates. Even if it is, the rotation is not transmitted to the rotation oJU2. 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 T 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 T is absorbed by the elastic deformation of the damper rubber 16 in the axial and circumferential directions. Furthermore, when the excitation coil 11 is de-energized from this state, the adsorption of the armature 18 to the rotor 7 is released, and at this moment the damper rubber 16, which has been fully compressed, elastically restores itself, 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. 4 and 5 absorbs the shock during torque transmission by providing the damper rubber 16, reduces the vibration of the screw P of the rotating shaft 2, and prevents sudden torque build-up. The damper rubber type has the advantage of suppressing the heat generation, and the provision of the stopper rubber 19 also has the advantage of eliminating unpleasant noise when the power transmission is disconnected.However, it also has the following problems. A point is left.

That is, in this electromagnetic clutch, the damper cover 15 is welded to the stopper plate 4, and the damper rubber 16 is integrated with this by sulfur coagulation or press fitting, which results in poor workability and poor quality of the welded parts. There is a risk that variations may occur. Furthermore, since the stopper plate 4 supports the armature 18 and is subjected to a torque load, the designed wall thickness needs to be thick enough to withstand mechanical strength. The weight of the included output-side rotating member increases. Therefore, if this electromagnetic clutch is mounted on a rotating shaft 2 that rotates while receiving a periodically fluctuating load, such as a compressor, for example,
There is a problem in that this further increase in load fluctuation not only deteriorates the operating characteristics of the electromagnetic clutch itself but also affects its peripheral equipment. In particular, the pulley of the crankshaft and the input pulley of other machinery are connected by a single belt, and each machinery is controlled to zero N by an electromagnetic clutch.
If the power transmission path is such that -OFF control is used, there is a risk that an unexpected accident may occur due to the above-mentioned vibration.

Furthermore, since the damper rubber 16 is circular, when the power transmission is repeatedly connected and disconnected, the leading side of the damper rubber 16 in the rotational direction is compressed and the lagging side in the rotational direction is expanded, causing cracks in the damper rubber 16 near the bonded portion of the rivet 17. There is a problem that occurs. Furthermore, since the stopper plate 4 and the armature hub 3, which are supported by the support member 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 attached member, and the magnetic attraction force of the armature 18 decreases.

[Failure to solve the problem]

In order to solve these problems, the present invention replaces the armature support member, which is mounted on the rotating shaft and supports the armature so as to be movable in the axial direction, with an annular non-magnetic material fixed to the hub and its flange. A plurality of recesses long in the circumferential direction are provided at positions formed by the plate and dividing the outer circumference of the plate approximately equally in the circumferential direction, and the recesses are filled with an elastic member for supporting the armature. At the same time, a buffering elastic member interposed between the armature, the plate, and the elastic member is fixedly provided on the armature side. Further, as another invention, the connecting member between the elastic member in the recessed portion and the armature is provided closer to the side that precedes the rotational direction of the rotating shaft than the circumferential center of the elastic member.

[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 is transmitted! i! !
Cut off. In such a power transmission VCVA, the elastic member filled in the recess deforms elastically in the axial and circumferential directions, thereby absorbing the impact due to adsorption and the torsional vibration of the rotating shaft. Since the elastic member is long in the circumferential direction, the elastic action is strong, and if the plate recess is integrally formed with aluminum die casting or the like, production is easy and magnetic flux does not leak. Furthermore, the shock-absorbing elastic member eliminates the sound of the armature hitting when the power transmission is cut off. In addition, by making the elastic member in the recess and the armature connecting member eccentric in the circumferential direction, the capacity of the elastic member on the side that lags behind the rotational direction of the connecting member increases, and the buffering effect becomes even thicker, causing cracks in the elastic member. etc. rarely occur.

〔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, the electromagnetic clutch 21 includes a rotor 24 that is rotatably supported on the front nose 22 of the compressor via a bearing 23.
A boo IJ25 having the following is integrally fixed. A belt is stretched between the pulley 25 and a pulley on a crankshaft (not shown). Further, 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 that connects the exciting coil 29 and the electromagnet.

On the other hand, on the rotary shaft 33 of the compressor, an armature hub 35, which is a constituent member of an armature support member and is generally designated by the reference numeral 34, is screwed into the threaded end portion, and the armature hub 35 is screwed into the rotary shaft 33 through a washer 36. ) 37! It is fixed and its movement in the ll-axis direction is regulated.

The armature support member 34 is
5 and a plurality of rivets 38 and set screws 39 on its flange.
An annular plate 40 made of non-magnetic material integrally fixed with
In this embodiment, the plate 40 is formed by die-casting aluminum. A plurality of concave portions 4Qa formed in an oval shape elongated in the circumferential direction are integrally molded on the outer peripheral portion of the plate 40 at locations that are approximately equally divided in the circumferential direction at the same time as the die-casting of the plate 40. There is. In other words, the recessed portion 40 &
The heavy annular walls 40b+40c are integrally formed and partitioned by arc-shaped partition walls 40d. A damper rubber 41 as an elastic member is filled in each of the concave portions 40a formed in this manner by vulcanization solidification or press fitting, and a rivet 42 is provided in the circumferential center of each damper rubber 41. The head is buried. 43 is plate 40
A disc-shaped armature disposed between the rotor 24 on the inside of the armature, and a rivet hole on the outer periphery of the armature.
The projecting end head of the rivet 42 is slidably engaged, so that the armature 43 is supported via the damper rubber 41 by the armature support member 34 so as to be movable in the axial direction. On the outside of the rivet 42 insertion portion of the armature 43, a stopper rubber 44 as a buffering elastic member is interposed between the armature 43, the plate, and the damper rubber 41, and is fixed by baking or the like. 4
Numerals 5 and 46 designate a plurality of demagnetizing portions, which are provided in each of the rotor 24 and the armature 43 to divert the magnetic flux generated around the excitation coil 29 to the armature 43 by excitation of the excitation coil 29.

The operation of the electromagnetic clutch configured as above will be explained. When demagnetizing the excitation coil 29 shown in the figure, the damper comb 4
Since the armature 43 fixed to the first side is spaced apart from the rotor 24, even if the cipley 25 is driven and rotated from the crankshaft side, the rotation is not transmitted to the rotating shaft 33. When a voltage is applied to the excitation coil 29 from this state, the armature 43 does not elastically deform the damper rubber 41 in the compression direction, but is attracted to the attraction surface of the rotor 24, and the rotation of the pulley 25 is transmitted to the rotating shaft 33. in this case,
The shock that occurs at the moment when the armature 43 is attracted to the rotor 24 is absorbed by the elastic deformation of the damper rubber 41 in the direction of the shaft leg, and the elastic deformation of the damper rubber 41 in the circumferential direction causes torsional vibration of the rotation 411i133. As a result, sudden torque rise is suppressed. At this time, since the damper rubber 41 is formed into an oval shape so as to be elongated in the circumferential direction, the elastic action is increased, and the rotation shaft 3
The damper effect against torsional vibration i/(3) is improved.

Further, when the excitation coil 29 is de-energized from the state t', the adsorption of the armature 43 to the rotor 24 is released, and at this moment the pressure 4. The damper rubber 41 that has been accommodated elastically restores its original state, and the armature 43 moves outward, thereby cutting off the power. In this case, armature 43
By interposing the stopper rubber 44 between the plate 40 and the damper rubber 41, the period before the armature 43 contacts the plate 40 is eliminated.

FIG. 3 is a front view of an electromagnetic clutch showing an embodiment of the second invention corresponding to FIG.
1, the center position of the rivet 42 as a connecting member connecting the damper rubber 410 is shifted by an amount indicated by B in the direction preceding the rotational direction of the armature 43, which is indicated by arrow A in the figure, from the center in the circumferential direction of the damper rubber 410. Ta. The rest is the same as the embodiment of the first invention. With this configuration, the capacity of the damper rubber 43 on the side that lags behind the rivet 42 in the rotational direction, indicated by the symbol C in the figure, is smaller than that of the rivet 42.
2 is larger than that shown in FIG. 2, which is the center vc6 of the damper rubber 41, so that deterioration of the damper rubber 41 is reduced. That is, when the load on the compressor connected to the rotating shaft 33 increases, cracks tend to occur near the rivet 42 on the side indicated by the symbol C due to tensile stress, but the dimension of C is smaller than that of the conventional one shown in FIG. The one shown in FIG. 2 is larger, and the one shown in FIG. 3 is even larger than the one shown in FIG. do.

In addition, although each of the above embodiments shows an example in which the present invention is implemented as an electromagnetic clutch in a compressor for vehicle width, the type of equipment to be implemented is not limited, and the invention may be implemented as an electromagnetic brake.

[Effects of the Invention] As is clear from the above description, in the electromagnetic coupling device according to the present invention, the 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 a non-magnetic material fixed to the flange of the hub, and a plurality of recesses are provided at positions that divide the outer circumference of the plate approximately equally in the circumferential direction. By filling the armature with an elastic member for supporting the armature, the plate of the armature supporting member can be integrally formed by die-casting, etc., which simplifies manufacturing and improves workability, while also reducing the weight of the rotating member. is reduced and the operating characteristics are improved. Furthermore, since the plate is made of a non-magnetic material, there is an effect that magnetic flux leakage is reduced and the magnetic attraction force of the shear mature is increased. moreover,
By forming the concave portion and the elastic member filling the concave portion to be elongated in the circumferential direction, the elastic action is increased, and the damping effect against torsional vibration of the rotating shaft is increased, so that power transmission is performed smoothly. In addition, as another invention, the core of the connecting member that connects the elastic member and the armature is moved toward the leading side in the rotational direction, thereby further increasing the cushioning effect and improving the durability of the elastic member. In addition, in each invention, since it is possible to interpose a buffering elastic member between the armature, the plate, and the elastic member, the impact when the armature returns is alleviated, and the hitting sound is eliminated, thereby reducing the noise. It is possible to measure the reduction in

[Brief explanation of drawings]

1 to 3 show an embodiment of the electromagnetic coupling device according to the present invention, FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is a front view thereof, and FIG. 3 is an embodiment of the second invention. FIG. 4 is a longitudinal sectional view of a conventional electromagnetic coupling device, and FIG. 5 is a front view of the electromagnetic coupling device shown.
The figure is also a front view. 21... Electromagnetic clutch, 29... Excitation coil,
31... Excitation device, 33... Rotating shaft, 34...
... Armature, 35 ... Armature hub, 4
0... Plate, 40a... Concave portion, 41...
・・Tampa rubber, 42・・Rivet, 43・・・・
Armature, 44...stopper rubber. Patent Applicant Ogura Clutch Co., Ltd. Agent Masaki Yamakawa (12 people) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Procedural Amendment Form 1 Indication of Part 1
Morihe 1985 Patent Application No. 6359 2, Name of Invention Electromagnetic Coupling Device 3, Relationship with Amendment Case Patent Name of Applicant (Name)
Ogura Clutch Co., Ltd., -7・' 5, Correction target n+ f! AM Tatami claims column (2) Detailed description of the invention in the specification column (2) Page 2 of the specification, page 1 from the bottom
Correct "the present invention" in the line to "the present invention". (3) On page 4, lines 3 to 5, "excitation device 13 consisting of an annular excitation coil 11 and a field core 12 that holds it" is replaced with "excitation device 13 consisting of a field core 12 that holds an annular excitation coil 11". Correct with device 13J. (4) “Damper guide 15” on page 4, line 12? Correct as "damper cover 15". (5) Change "stopper rubber piece 19" in the first line from the bottom of page 4 to "
Stopper rubber 19". 16) On page 48, in lines 3 to 1 from the bottom, "A shock absorbing elastic member is installed by fixing it to the armature side." is corrected to "A shock absorbing elastic member is installed." (7) “Annular excitation coil 2” in lines 6-4 from the bottom of page 10
9 and a field core 30 that holds the excitation coil 29 is corrected as "an excitation device 31 that consists of a field core 30 that holds an annular excitation coil 29." An armature hub 35 is fitted to the threaded end of the armature, and is inserted through a washer 36.
The armature hub 35 is fitted with serrations at its tip, and is corrected as follows: (9) Delete "and set screw 39" on page 11, line 9. (10) Between "formed" and "1 plate 40" on page 11, line 12, [39 is an extraction tap. ”
join. uIl Correct "slidably engaged" in lines 6-7 on page 12 to "caulked". (121, page 12, line 12, "Plate," is corrected to "Plate 40,".
damper rubber 41". 114) On page 15, lines 8 to 11, ``In addition, each of the above-mentioned embodiments may be practiced.'' shall be corrected as shown in the following sentence. In addition, in this embodiment, the stopper rubber 44 may be formed integrally with the damper rubber 41 when the damper rubber 41 is vulcanized into the concave portion 40a. Although we have shown a standard example of implementing it as an electromagnetic clutch in a compressor for
It is not limited to Category 4, and may also be implemented as an electromagnetic brake. ([9 Figures 1, 2, and 3 are revised according to the appendix. Claims (1) An armature support member mounted on a rotating shaft and an outer periphery of this armature support member. An electromagnetic coupling device comprising: an elastic member that is provided in a section and supports an armature facing inward so as to be movable in the axial direction; and an excitation device that magnetically attracts the armature inward against the elasticity of the elastic member. , 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 a plurality of circumferentially long annular plates are provided at positions dividing the outer circumference of the plate into equal parts g in the circumferential direction. An electromagnetic coupling device characterized in that a recess is provided, the recess is filled with the elastic member, and a buffering elastic member is provided interposed between the armature, the plate, and the elastic member. (2) A companion armature support member that is mounted on the rotating shaft, an elastic member that is provided on the outer periphery of this armature support member and supports the armature that faces the inside of the cylinder so as to be movable in the axial direction, and the elasticity of this elastic member. 1. A JJ magnetic device that magnetically attracts the armature in the entire inner direction of the armature.
・The armature support member is formed of a hub and an annular grate made of non-magnetic material fixed to the flange of the hub, and the outer periphery of this plate is extended in the circumferential direction. A plurality of recesses are arranged in the circumferential direction at positions equally divided by y, a plurality of recesses are filled in the recesses, and the elastic member is interposed between the armature, the plate, and the elastic member. A buffering elastic member is provided, and a connecting member that connects the elastic member in the recess and the armature is placed ahead of the circumferential center of the elastic member in the recess with respect to the (9) rotation direction of the rotating shaft. An electromagnetic four-point device characterized by being placed closer to the side. Figure 1 Figure 2

Claims (2)

[Claims] (1) An armature support member mounted on a rotating shaft, an elastic member provided on the outer periphery of the armature support member to support the armature facing inward so as to be movable in the axial direction, and an elastic member that resists the elasticity of the elastic member. and an excitation device that magnetically attracts the armature inward, wherein the armature support member is formed of a hub and an annular plate made of a non-magnetic material fixed to the flange of the hub, A plurality of recesses long in the circumferential direction are provided at positions that divide the outer peripheral portion approximately equally in the circumferential direction, the recesses are filled with the elastic member, and the armature, the plate, and the elastic member are An electromagnetic coupling device characterized in that a buffering elastic member interposed therebetween is fixedly provided on the armature side. (2) An armature support member mounted on a rotating shaft, an elastic member provided on the outer periphery of the armature support member to support the armature facing inward so as to be movable in the axial direction, and an elastic member that resists the elasticity of the elastic member. and an excitation device that magnetically attracts the armature inward, wherein the armature support member is formed of a hub and an annular plate made of a non-magnetic material fixed to the flange of the hub, A plurality of recesses long in the circumferential direction are provided at positions that divide the outer peripheral portion approximately equally in the circumferential direction, the recesses are filled with the elastic member, and the armature, the plate, and the elastic member are A buffering elastic member interposed therebetween is fixedly provided on the armature side, and a connecting member connecting the elastic member in the recess and the armature is positioned closer to the rotation axis than the circumferential center of the elastic member in the recess. An electromagnetic coupling device characterized in that it is provided closer to the leading side with respect to the rotational direction of the device.