JP2007139032A - Electromagnetic connection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic connection device having improved reliability and durability by preventing the destruction and fly or drop of an armature supporting member or a damper rubber, if heated and softened with friction heat, without causing the slipping rotation of an armature when driven side equipment is stopped by overload. <P>SOLUTION: An armature supporting member 8 storing the damper rubber 10 is fixed to a flange 7b of an armature hub 7. The damper rubber 10 is connected to the armature 12 with a connection member 13. A rotation restricting part 40 consisting of a engaging recessed portion 41 and an engaging protruded portion 42 for engaging with the outer peripheral face of the flange 7b of the armature hub 7 and with the inner peripheral face of the armature 12, respectively, is provided for preventing the rotation of the armature hub 7 relative to the armature 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a damper rubber type electromagnetic coupling device used for an electromagnetic clutch for a car air conditioner, for example.

  An electromagnetic clutch as an electromagnetic coupling device used in a compressor for a car air conditioner supports an armature through an elastic member such as a leaf spring or a damper rubber on an armature hub, and the armature is rotated against the elastic force of the elastic member. The rotation of the automobile engine is transmitted to the compressor by magnetically adsorbing to the compressor (see, for example, Patent Documents 1 and 2).

  FIGS. 11 to 13 show an example of a conventional electromagnetic crunch in which a damper rubber is used as an elastic member and an armature support member that holds the armature via the damper rubber is formed of a synthetic resin. In these drawings, an electromagnetic clutch denoted by reference numeral 1 as a whole is mounted on a car air conditioner compressor 2 and used as a power transmission device that transmits or blocks the rotation of an automobile engine to the compressor 2. 3 is a housing of the compressor 2, 4 is a rotor (drive-side rotating member) pivotally attached to a cylindrical portion 3 a of the housing 3 via a bearing 5, 6 is a drive shaft of the compressor 2, and 7 is a drive shaft 6 A mounted armature hub (driven rotation member), 8 is a synthetic resin armature support member fixed to a flange 7b of the armature hub 7 by a plurality of rivets 9, and 10 is a plurality of storage portions provided in the armature support member 8. Damper rubbers 12 respectively housed in 11 are disposed between the rotor 4 and the armature support member 8, and armatures 14 connected to the damper rubber 10 by connecting members 13 are incorporated in the rotor 4 and armatures. 12 is an electromagnetic coil as an excitation device that magnetically attracts 12, and by these, the electromagnetic of the compressor 2 for car air conditioner Constitute the latch 1.

  In such an electromagnetic clutch 1, the armature 12 is in close contact with the back surface of the armature support member 8 by the elastic force of the damper rubber 10 when the electromagnetic coil 14 is demagnetized, and is separated from the rotor 4. Therefore, in this state, the rotation of the automobile engine is not transmitted to the drive shaft 6 of the car air conditioner compressor 2 via the rotor 4.

  When the electromagnetic coil 14 is energized and excited from this state, the armature 12 is magnetically attracted to the rotor 4 against the elastic force of the damper rubber 10 by the magnetic attractive force, whereby the rotation of the rotor 4 is coupled to the armature 12 and the connecting member 13. -Damper rubber 10-Armature support member 8-Rivet 9-It is transmitted to the drive shaft 6 via the hub 7. The damper rubber 10 effectively buffers torque fluctuations and impacts transmitted from the rotor 4 to the armature 12 during power transmission.

Japanese Patent No. 2961669 Japanese Patent No. 3059347

  However, in the conventional electromagnetic clutch 1 described above, when an overload occurs on the compressor 2 side and the rotation of the drive shaft 6 stops, the rotor 4 and the armature 12 are in a slipping state, so that the coupling member 13 is caused by frictional heat. Has been heated to destroy the damper rubber 10 and the armature support member 8. That is, when the rotor 4 and the armature 12 are in a slip state, frictional heat is generated and the connecting member 13 is heated, so that the damper rubber 10 and the armature support member 8 are also heated by heat conduction. Further, since the armature 12 is only connected to the damper rubber 10 via the connecting member 13, it tries to continue to rotate integrally with the rotor 4. For this reason, the connecting member 13 receives the rotational force of the armature 12 and moves in the rotational direction (arrow direction) of the armature 12 as shown in FIG. Press against the inner wall of the storage part 11 of the member 8. Then, when the slip state continues and the temperature of the connecting member 13 rises above a certain temperature, the damper rubber 10 and the peripheral wall portion of the storage portion 11 are softened and broken as shown in FIG. When the storage unit 11 jumps out of the storage unit 11 and hits the storage unit 11 positioned on the front side in the rotation direction, the front storage unit 11 is also softened by heating and is broken to be completely separated from the armature support member 8 (FIG. 13C). . For this reason, the melted pieces 11 ′ of the storage portion 11 and the broken damper rubber 10 are scattered around the compressor 2 and dropped off.

  Therefore, in order to solve such a problem, the electromagnetic clutch described in Patent Document 2 described above has a peripheral wall height of the storage portion 11 provided in the armature support member 8 and storing the damper rubber 10 from the connecting member 13. Is also high. When the peripheral wall height of the storage portion 11 is made higher than the connecting member 13 in this way, the portion of the peripheral wall portion of the storage portion 11 that is heated and softened by the connecting member 13 is a lower portion than the connecting member 13. The upper peripheral wall portion protruding from the connecting member 13 forms a non-dissolved damaged portion and is not separated from the armature support member 8, and can prevent separation and detachment of the fragments 11 ′ of the storage portion 11.

However, in such an electromagnetic clutch, since the height of the peripheral wall of the storage portion 11 needs to be higher than that of the connecting member 13, there is a problem that the axial dimension of the clutch itself becomes longer and the size thereof is increased. In addition, after the connecting member 13 heat-softens and melts the peripheral wall portion of the storage portion 11, only the non-dissolved damaged portion of the peripheral wall portion higher than the head portion of the connecting member 13 rotates more than the connecting member 13 of the armature support member 8. Since the outer part must be supported while the rotor 4 and the armature 12 are rotating in a slip state, the strength is insufficient and the structure is easily broken.
Therefore, it is necessary to further increase the peripheral wall portion or to increase the thickness of the peripheral wall portion in order to give the strength of the non-dissolved damaged portion of the peripheral wall portion, but in this case, the armature support member 8 becomes larger and heavier. There was a problem.

  Furthermore, for the connecting member 13 having the flange 13B integrally provided at the tip, the area for dissolving the peripheral wall portion of the storage portion 11 is increased, so that the fragments 11 'of the storage portion 11 are not separated and scattered completely. It cannot be prevented. Therefore, there is a demand for the development of an electromagnetic clutch that prevents the housing portion 11 of the synthetic resin armature support member 8 from being separated and scattered by frictional heat even for the connecting member 13 having the flange 13B.

  The present invention has been made to solve the above-described conventional problems, and the object of the present invention is to prevent the armature from rotating relative to the armature hub when the driven device stops due to an overload, and the armature does not rotate due to frictional heat. It is an object of the present invention to provide an electromagnetic coupling device that can prevent a support member and a damper rubber from being melted and scattered and fall even when softened by heating, and can improve reliability and durability.

  In order to achieve the above object, the present invention includes an armature hub, a synthetic resin armature support member fixed to the armature hub, and a plurality of storage portions integrally provided near the outer periphery of the armature support member. A plurality of damper rubbers respectively housed, and a plurality of connecting members attached to one end side of each of the damper rubbers and the other end side penetrating through a through-hole provided in the bottom of each of the housing parts so as to be movable in the axial direction; An armature fixed to the other end of these connecting members; a rotor disposed opposite to the armature; and an elastic force of the damper rubber that is provided in the rotor and energized during power transmission. And an exciting device that magnetically attracts the rotor, and restricts relative rotation of the armature hub and the armature. In which the rotation regulating portion is provided that.

  In the present invention, the rotation restricting portion is constituted by an engaging portion that is provided on the armature hub and the armature and engages with each other.

  Further, in the present invention, the rotation restricting portion is constituted by a plate insertion hole interposed between the armature support member and the armature and fixed to the armature hub, and the connecting member can be moved in the axial direction in the insertion hole. It is inserted through.

  In the present invention, the rotation restricting portion prevents relative rotation between the armature hub and the armature. Therefore, even if the drive shaft stops for some reason, the connecting member does not press the damper rubber against the peripheral wall of the housing portion of the armature support member, and the damper rubber and the housing portion are melted by frictional heat caused by the slip between the rotor and the armature. There is nothing.

  In the present invention, since the rotation restricting portion is an engaging portion that is provided on the armature hub and the armature and engages with each other, the structure is simple without using other components. As the engaging portion, a protrusion and a concave portion are used.

  Furthermore, in the present invention, since the insertion hole of the plate interposed between the armature support member and the armature restricts the movement of the connecting member, the armature to which the connecting member is fixed does not move, and the armature hub and the armature Relative rotation can be prevented. Therefore, even if the drive shaft stops for some reason, the connecting member does not press the damper rubber against the peripheral wall of the housing portion of the armature support member, and the damper rubber and the housing portion are melted by frictional heat caused by the slip between the rotor and the armature. There is nothing.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
1 is a front view showing an embodiment of an electromagnetic coupling device according to the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, FIG. 3 is a rear view of an armature hub and an armature, and FIG. It is a rear view of an armature hub and an armature. The same components and portions as those of the conventional apparatus shown in FIGS. The structure of the electromagnetic coupling device 20 itself is substantially the same as that of the conventional electromagnetic clutch 1 described above. The difference is that a rotation restricting portion 40 that restricts the relative rotation of the armature hub 7 and the armature 12 is provided.

  In FIG. 2, the rotor 4 which is a drive side rotating member is composed of a disc portion 4A, an outer cylindrical portion 4B and an inner cylindrical portion 4C which are integrally projected on the back side of the disc portion 4A. A plurality of V grooves 21 are formed on the outer peripheral surface of the portion 4B, and the power of the automobile engine is transmitted to the outer cylindrical portion 4B via a V belt (not shown). An annular groove 22 opened rearward is formed between the disc portion 41 and the outer cylindrical portion 4B and the inner cylindrical portion 4C. The electromagnetic coil 14 is accommodated in the annular groove 22. The inner cylindrical portion 4 </ b> C is rotatably supported by a protrusion 3 a provided on the housing 3 of the compressor 2 via a bearing 5.

  The drive shaft 6 of the compressor 2 is rotatably disposed in the housing 3 with the rotor 4 aligned with the axis, and the armature hub 7 is fixed to the shaft end on the rotor 4 side by a bolt 23.

  The armature hub 7 is integrally provided with a boss 7a splined to the shaft end of the drive shaft 6 and a disk-like flange 7b extending in a radial direction from the boss 7a. The armature support member 8 is fixed to the front surface side of the flange 7b by three rivets 9, and the armature 12 is also provided on the back surface side so as to be movable in the axial direction via three damper mechanisms 24.

  The armature support member 8 is made of a plate having a substantially triangular shape in front view made of reinforced plastic or the like. The armature support member 8 is concentrically formed at equal intervals in the circumferential direction on the outer side of the center hole 25 and the three holes. The hole 26 has three insertion holes 27 formed concentrically at regular intervals in the circumferential direction on the outside of the insertion holes 26. The insertion holes 26 are holes through which the rivets 9 are inserted. The insertion holes 27 are holes through which the connecting members 13 are inserted, and are formed at each corner of the armature support member 8.

  Further, on the surface of the armature support member 8, a cylindrical portion 28 surrounding the central hole 25, a cylindrical portion 29 surrounding the insertion holes 26, a cylindrical portion 11 surrounding the circumference of the insertion holes 27, and these Reinforcing ribs 30 that connect the cylindrical portions 11, 28, and 29 are protruded integrally. Each cylindrical portion 11 constitutes a storage portion that stores the damper mechanism 24.

  The damper mechanism 24 includes a cylindrical damper rubber 10 fitted in the storage portion 11 and the connecting member 13 to which the damper rubber 10 is fitted. The connecting member 13 includes a cylindrical main body 13A that is inserted into the center hole 31 of the damper rubber 10, a flange 13B that protrudes integrally with the front end surface of the main body 13A and is in close contact with the surface of the damper rubber 10, and the main body 13A. A caulking portion 13C that protrudes integrally with the rear end surface and penetrates the insertion hole 27 formed on the bottom surface of the storage portion 11 so as to be movable in the axial direction and projects to the back side of the armature support member 8 is formed. ing. The caulking portion 13 </ b> C is inserted into an insertion hole 33 formed in the armature 12 and caulked to attach the armature 12 to the back side of the armature support member 8 so as to be able to contact and separate.

  In FIG. 3, the armature hub 7 and the armature 12 are provided with a rotation restricting portion 40 for restricting the relative rotation of these members. The rotation restricting portion 40 includes engaging portions 41 and 42 that engage with each other. One engaging portion 41 is composed of three concave portions formed on the outer peripheral surface of the flange 7b of the armature hub 7 at equal intervals in the circumferential direction. The other engaging portion 42 is composed of three V-shaped protrusions formed on the inner peripheral surface of the armature 12 so as to face the engaging portions 41. Further, the engaging portion 41 is constituted by a V-shaped concave portion, and the engaging portion 42 is constituted by a V-shaped projection having the same shape as the engaging concave portion 41. A gap 43 smaller than the maximum compression amount of the damper rubber 10 is provided between the engaging portion 41 and the engaging portion 42.

  The shapes of the engaging portion 41 and the engaging portion 42 are not limited to the V-shaped concave portions and protrusions, and can be made into an appropriate shape. For example, the rectangular concave portion 41 ′ and the protrusion 42 ′ shown in FIG. 5 may be used.

  Further, as shown in FIG. 6, an engaging portion 45 made of a V-shaped protrusion is provided on the flange 7 b of the armature hub 7, and an engaging portion 46 made of a V-shaped recess is formed on the inner peripheral surface of the armature 12. Alternatively, as shown in FIG. 7, an engaging portion 45 ′ made of a square protrusion is provided on the flange 7 b of the armature hub 7, and an engaging portion 46 made of a square recess is formed on the inner peripheral surface of the armature 12. 'May be formed.

  In the electromagnetic coupling device 20 having such a structure, the engaging portions 41 and 42 that engage with each other are provided on the opposing surfaces of the armature hub 7 and the armature 12, so that the compressor 2 is in use for some reason. When an overload occurs on the compressor 2 side and the drive shaft 6 stops, the armature 12 has a slight angle corresponding to the gap 43 (FIG. 3) between the engagement recess 41 and the engagement protrusion 42 as shown in FIG. When only the rotation is performed, the engagement portion 42 is engaged with the engagement portion 41, so that the engagement portion 42 does not rotate any more, and only the rotor 4 slips with respect to the armature 12. Therefore, the damper rubber 10 is not strongly compressed by being strongly pressed against the inner wall of the storage portion 11 by the connecting member 13, and the damper rubber 10 is not subjected to rotational force by the connecting member 13 unless the armature 12 slips and rotates. Therefore, even if heated and softened by frictional heat due to the slip rotation of the rotor 4, it is not melted and scattered or dropped off, and a damper rubber type electromagnetic coupling device with high durability and reliability can be provided.

  If the rotor 4 continues to rotate with respect to the armature 12, if the temperature of the connecting member 13 rises due to frictional heat and abnormally heats the damper rubber 10, the damper rubber 10 may be seized onto the connecting member 13 or the storage portion 11. is there. Therefore, a temperature fuse that is blown by the frictional heat of the rotor 4 and the armature 12 is connected in series to the electromagnetic coil 14, and when the temperature reaches a certain temperature, the temperature fuse is blown and the energization of the electromagnetic coil 14 is cut off and demagnetized. desirable.

8 to 10 show other embodiments of the present invention. FIG. 8 is a front view of the electromagnetic coupling device, FIG. 9 is a sectional view taken along line IX-IX of FIG. 8, and FIG. 10 is a front view of the plate. is there.
In these drawings, in the present embodiment, a plate 50 having an appropriate thickness is interposed between the armature support member 8 and the armature 12, and these are integrally coupled by three rivets 9.

  The plate 50 is formed in a disc shape and has a center hole 51, three insertion holes 52 through which the rivet 9 passes, and three insertion holes 53 through which the connecting member 13 also passes. The armature 12 is connected to the damper rubber 10 via the connecting member 13, and is usually in close contact with the back surface of the plate 50 by the elastic force of the damper rubber 10. The rear end portion of the connecting member 13 passes through the insertion hole 53 of the plate 50 so as to be movable in the axial direction while maintaining an appropriate gap G, and the caulking portion 13C is inserted into the insertion hole 33 of the armature 12 and caulked. . The insertion hole 53 of the plate 50 constitutes a rotation restricting portion that restricts the relative rotation of the armature hub 7 and the armature 12 by allowing the connecting member 13 to move in the rotation direction by the gap G with the connecting member 13. Yes.

  In the electromagnetic coupling device having such a configuration, the relative rotation between the armature hub 7 and the armature 12 is restricted by the insertion hole 53 of the plate 50 into which the coupling member 13 is loosely inserted. Even if the drive shaft stops and the armature 12 rotates by a slight angle corresponding to the gap G shown in FIG. 9, the connecting member 13 hits the inner wall of the insertion hole 53 and does not rotate any further, and only the rotor 4 Slip rotation with respect to the armature 12. Therefore, similarly to the above-described embodiment, the damper rubber 10 is not greatly compressed by the connecting member 13 and pressed against the inner wall of the storage portion 11, and if the rotating force is not received by the connecting member 13, the damper 4 slips. Even if heated and softened by frictional heat due to rotation, it does not melt and scatter or fall off. In addition to the rotation restricting function, the plate 50 may have a sound absorbing function or a dustproof function depending on the selection of the material.

1 is a front view showing an embodiment of an electromagnetic coupling device according to the present invention. It is the II-II sectional view taken on the line of FIG. It is a rear view of an armature hub and an armature. It is a rear view of an armature hub and an armature when an overload occurs. It is a figure which shows other embodiment of an engaging part. It is a figure which shows other embodiment of an engaging part. It is a figure which shows other embodiment of an engaging part. It is a front view of an electromagnetic coupling device. It is the IX-IX sectional view taken on the line of FIG. It is a front view of a plate. It is a front view which shows the prior art example of an electromagnetic clutch. It is the XII-XII sectional view taken on the line of FIG. (A), (b), (c) is a figure for demonstrating destruction by the heat softening of the storage part and damper rubber at the time of a slip.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Compressor, 3 ... Housing, 4 ... Rotor, 5 ... Bearing, 6 ... Drive shaft, 7 ... Armature hub, 8 ... Armature support member, 9 ... Rivet, 10 ... Damper rubber, 11 ... Storage part, 12 ... Armature, DESCRIPTION OF SYMBOLS 13 ... Connection member, 14 ... Electromagnetic coil, 40 ... Rotation restriction part, 41, 41 ', 46, 46' ... Engagement part, 42, 42 ', 45, 45' ... Engagement part, 50 ... Plate, 53 ... Insertion hole.

Claims (3)

An armature hub, an armature support member made of synthetic resin fixed to the armature hub, a plurality of damper rubbers respectively stored in a plurality of storage portions integrally provided near the outer periphery of the armature support member, and one end The damper rubber is attached to the side, and the other end is fixed to the other ends of the plurality of connecting members penetrating through the through-holes provided in the bottom of the storage portions in the axial direction. An armature, a rotor disposed opposite to the armature, and an excitation that is provided on the rotor and is magnetically attracted to the rotor against the elastic force of the damper rubber by being energized during power transmission. With the device,
An electromagnetic coupling device comprising a rotation restricting portion for restricting relative rotation between the armature hub and the armature. The electromagnetic coupling device according to claim 1.
The electromagnetic coupling device according to claim 1, wherein the rotation restricting portion comprises an engaging portion that is provided on the armature hub and the armature and engages with each other. The electromagnetic coupling device according to claim 1.
The rotation restricting portion is constituted by a plate insertion hole interposed between the armature support member and the armature and fixed to the armature hub, and the connecting member is inserted into the insertion hole so as to be movable in the axial direction. Electromagnetic coupling device.

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