JP2006233892A - Electromagnetic clutch of compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic clutch of a compressor capable of aligning shaft axes of a core ring and a rotor with high precision. <P>SOLUTION: Since a supporting part 22c for supporting the rotor 11 is integrally provided on the core ring 22, the core ring 22 can be formed coaxially with the supporting part 22c, and the rotor 11 supported by the supporting part 22c and the core ring 22 can be arranged on the same shaft axis even if aligning is not performed separately. In this case, since a fixed part 22b is engaged with an engaging part 4c of a compressor main body 4 to regulate its travel in the radial direction, the core ring 22 does not cause positional deviation in the radial direction for the compressor main body 4 and the shaft axes of the core ring 22 and a rotary shaft 1 can be aligned with high precision. Consequently, since size of a clearance A between the core ring 22 and the rotor 11 can be reduced, magnetic permeability between the core ring 22 and the rotor 11 can be increased. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetic clutch of a compressor used in, for example, a vehicle air conditioner.

In general, as this type of electromagnetic clutch, as shown in FIG. 9, a core ring 2 disposed coaxially with the rotary shaft 1 of the compressor, an electromagnetic coil 3 provided on the core ring 2, and a compressor body 4 An annular rotor 6 that is rotatably supported on the outer peripheral surface of the support portion 4a extending in the axial direction from the bearing 5 via a bearing 5 and surrounds the outer peripheral surface and the inner peripheral surface of the core ring 2, and the rotor 6 The armature 7 is disposed so as to face one end surface of the rotor 6, and the armature 7 is attracted to one end surface in the axial direction of the rotor 6 by the magnetic force of the electromagnetic coil 3, whereby the rotational force of the rotor 6 is rotated by the compressor. A device that transmits to the shaft 1 is known (for example, see Patent Document 1).
JP-A-8-247171

  By the way, in the electromagnetic clutch, in order to increase the magnetic permeability between the core ring 2 and the rotor 6, it is necessary to reduce a radial gap between the core ring 2 and the rotor 6. 2 is welded to one axial end surface of the core ring 2 so that the axial center of the core ring 2 and the fixed ring are accurately aligned due to misalignment during welding. Difficult to do. For this reason, in order to avoid the contact between the core ring 2 and the rotor 6 due to the misalignment of the shaft center, the gap between the core ring 2 and the rotor 6 must be increased. There is a problem that the resistance increases and the power to the electromagnetic coil 3 must be increased.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an electromagnetic clutch of a compressor capable of aligning the axial centers of the core ring and the rotor with high accuracy. is there.

  In order to achieve the above object, the present invention surrounds the core ring disposed coaxially with the rotating shaft of the compressor, the electromagnetic coil provided on the core ring, and the outer peripheral surface and inner peripheral surface of the core ring. In the electromagnetic clutch of the compressor, wherein the rotor is rotatably supported on the outer peripheral surface of the support portion extending in the axial direction from the compressor body. A fixed portion fixed to the compressor is integrally provided, and the fixed portion is engaged with the compressor body so that movement in the radial direction is restricted.

  As a result, since the fixing portion fixed to the compressor main body is provided integrally with the core ring, the core ring can be formed coaxially with the fixing portion, and the core ring can be formed without separate alignment. And the fixed portion can be arranged on the same axis. In this case, since the fixing portion is engaged with the compressor main body so as to be restricted from moving in the radial direction, the fixing portion also does not shift in the radial direction with respect to the rotor.

  According to the present invention, the core ring and the fixed portion can be arranged on the same axis, and the fixed portion also does not cause a positional shift in the radial direction with respect to the rotor. Can be aligned with high accuracy. Thereby, since the clearance gap between a core ring and a rotor can be made small, the magnetic permeability between a core ring and a rotor can be raised, and the power consumption of an electromagnetic coil can be reduced significantly. Moreover, since the fixing part is provided integrally with the core ring, the number of parts can be reduced as compared with the case where a fixing ring made of another part is used.

  1 to 3 show a first embodiment of the present invention. FIG. 1 is a side sectional view of an electromagnetic clutch, FIG. 2 is a front view thereof, and FIG. 3 is an exploded side sectional view of an essential part thereof. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to a prior art example.

  The electromagnetic clutch 10 shown in the figure includes a rotor 11 arranged coaxially with a rotary shaft 1 of a compressor, an armature 12 arranged facing one end surface in the axial direction of the rotor 11, and a rotary shaft 1 of the compressor. , A substantially triangular plate 14 attached to the hub 13, a plurality of leaf springs 15 connecting the hub 13 and the armature 12, and a core ring 16 disposed coaxially with the rotor 11. And an electromagnetic coil 17 provided on the core ring 16.

  The rotor 11 is made of a metal magnetic material such as iron formed in an annular shape, and a belt winding portion 11a around which a multistage belt (not shown) is wound is provided on the outer peripheral surface thereof. The rotor 11 is rotatably supported by a support portion 4 a of the compressor body 4 via a bearing 5, and an inner peripheral surface thereof is fixed to the outer ring side of the bearing 5. One end surface of the rotor 11 faces the armature 12, and an annular recess 11 b surrounding the outer peripheral surface and inner peripheral surface of the core ring 16 is provided on the other end surface side. In addition, a long hole 11c extending in the circumferential direction is provided at one end face in the axial direction of the rotor 11 at intervals in the radial direction of the rotor 11, and each long hole 11c communicates with the recess 11b.

  The armature 12 is made of a metal magnetic material such as iron formed in a disc shape, and one end surface in the axial direction thereof faces one end surface of the rotor 11 with a slight gap. In the center of the armature 12, a circular opening 12a through which the hub 13 is inserted is provided, and the inner diameter of the opening 12a is larger than the outer diameter of the hub 13. The armature 12 is provided with a long hole 12 b extending in the circumferential direction, and the long hole 12 b is positioned between the long holes 11 c of the rotor 11.

  One end of the hub 13 in the axial direction is connected to the rotary shaft 12 of the compressor, and a flange 13a located in the opening 12a of the armature 12 is provided at the other end.

  The plate 14 is disposed on the other end surface side of the armature 12 and is connected to the flange 13 a of the hub 13 by rivets 18 at a plurality of circumferential positions.

  Each leaf spring 15 is formed in a straight line, and one end thereof is connected to the flange 13 a of the hub 13 together with the plate 14 by a rivet 18. The other end of each leaf spring 15 is connected to the armature 12 by a rivet 19.

  The core ring 16 is made of a metal magnetic body having a substantially U-shaped cross section formed in an annular shape, and an accommodating portion 16a for accommodating the electromagnetic coil 17 is annularly provided on one end side in the axial direction. The core ring 16 is disposed in the recess 11 b of the rotor 11, and a gap A is formed in the radial direction between the outer peripheral surface and the inner peripheral surface of the core ring 16 and the recess 11 b of the rotor 11. Further, a fixed portion 16b fixed to the compressor body 4 side is integrally provided on the other axial end side of the core ring 16, and the fixed portion 16b is formed in a flange shape extending radially inward. Stepped holes 16c penetrating in the axial direction are provided at a plurality of locations in the circumferential direction of the fixing portion 16b. The core ring 16 is fixed to the compressor body 4 by screwing. In this case, the compressor body 4 is provided with an engaging portion 4c having an outer diameter substantially equal to the inner diameter of the fixed portion 16b. By engaging the inner peripheral surface of the fixed portion 16b with the engaging portion 4c, the core The movement of the ring 16 in the radial direction is restricted.

  The electromagnetic coil 17 is composed of a winding of a conductive wire with an insulating film, and is fixed in the accommodating portion 16 a of the core ring 16.

  In the electromagnetic clutch 10 configured as described above, when engine power (not shown) is input to the belt winding portion 11a of the rotor 11 via the belt, the rotor 11 is coaxial with the rotary shaft 1 of the compressor. Rotate. At this time, when the electromagnetic coil 17 is not energized, the rotor 11 and the armature 12 are held at intervals from each other by the leaf springs 15, so that the rotor 11 idles with respect to the armature 12, The rotational force is not transmitted to the armature 12. Further, when the electromagnetic coil 17 is energized, the electromagnetic coil 17 generates a magnetic force, and the armature 12 is attracted to the rotor 11 side by the magnetic force of the electromagnetic coil 17. As a result, the armature 12 is attracted to one end surface in the axial direction of the rotor 11, and the rotational force of the rotor 11 is transmitted to the armature 12, and the rotational force of the armature 12 is transmitted to the rotary shaft 1 of the compressor via the hub 13. Is done.

  According to the present embodiment, since the fixing portion 16b fixed to the compressor body 4 is integrally provided on the core ring 16, the core ring 16 can be formed coaxially with the fixing portion 16b, and is separately aligned. Even if it does not perform, it can arrange | position the core ring 16 and the fixing | fixed part 16b on the same axial center. In this case, since the fixing portion 16b is engaged with the engaging portion 4c of the compressor body 4 so that the movement in the radial direction is restricted, the fixing portion 16b is displaced in the radial direction with respect to the rotor 11. It does not occur, and the axis of the core ring 16 and the rotor 11 can be aligned with high accuracy. Thereby, since the clearance A between the core ring 16 and the rotor 11 can be reduced, the magnetic permeability between the core ring 16 and the rotor 11 can be increased, and the power consumption of the electromagnetic coil 17 is greatly reduced. be able to. For example, conventionally, a magnetomotive force of 1200 AT is required, but in this embodiment, the magnetomotive force can be reduced to about 800 AT. Furthermore, since the fixing part 16b is integrally provided on the core ring 16, the number of parts can be reduced as compared with the case where a fixing ring made of another part is used.

  Further, since the fixing portion 16b of the core ring 16 and the compressor body 4 are fixed by the plurality of bolts 20, the conventional welding operation is not required and the assembling operation can be performed very easily.

  4 and 5 show a second embodiment of the present invention. FIG. 4 is a side sectional view of the electromagnetic clutch, and FIG. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to the said embodiment.

  Similarly to the first embodiment, the core ring 22 shown in the figure integrally includes a housing portion 22a for housing the electromagnetic coil 17 and a fixing portion 22b fixed to the compressor body 4 side, and the rotor 11 A support portion 22c for supporting is integrally provided. The support portion 22 c is formed in a cylindrical shape extending from the radially inner side of the fixed portion 22 b toward the one end side in the axial direction, and the rotor 11 is rotatably supported on the outer peripheral surface via a bearing 5. Further, the inner peripheral surface of the support portion 22c is rotatably supported on the rotary shaft 1 of the compressor via a bearing 23. A step portion 22d having an inner diameter substantially equal to the outer diameter of the engaging portion 4c of the compressor body 4 is provided between the support portion 22c and the fixed portion 22b, and the step portion 22d is engaged with the engaging portion 4c. As a result, the movement of the core ring 22 in the radial direction is restricted as in the first embodiment. Further, stepped holes 22e penetrating in the axial direction are provided at a plurality of locations in the circumferential direction of the fixing portion 22b, and the bolts 20 inserted into the respective holes 22e are screwed into the screw holes 4b of the compressor body 4. The core ring 22 is fixed to the compressor body 4.

  According to the present embodiment, since the support portion 22c for supporting the rotor 11 is provided integrally with the core ring 22, the core ring 22 can be formed coaxially with the support portion 22c, and alignment is performed separately. Even if it does not have, the rotor 11 supported by the support part 22c can arrange | position the core ring 22 on the same axial center. In this case, since the fixed portion 22b is engaged with the engaging portion 4c of the compressor body 4 so that the movement in the radial direction is restricted, the core ring 22 is displaced in the radial direction with respect to the compressor body 4. It does not occur, and the axis of the core ring 22 and the rotary shaft 1 can be aligned with high accuracy. Thereby, since the clearance A between the core ring 22 and the rotor 11 can be reduced, the magnetic permeability between the core ring 22 and the rotor 11 can be increased.

  Moreover, in the structure of this embodiment, since the fixing | fixed part 22b and the support part 22c can be integrally formed in the core ring 22 by cold forging, it can be formed with materials with high intensity | strength, such as iron, for example. The thickness of the portion 22c can be reduced.

  In the above embodiment, the fixing portion 22b of the core ring 22 is fixed to the compressor main body 4 with the bolt 20, but the protrusion 4d provided on the compressor main body 4 is provided as shown in FIG. By inserting into the hole 22e of the fixing portion 22b, and deforming the tip end side of the projection 4d so as to expand in the radial direction by caulking as shown in FIG. 7, and locking the deforming portion 4d ′ to the fixing portion 22b. The core ring 22 may be fixed to the compressor body 4. In addition, as shown in FIG. 8, the core ring 22 is fixed to the compressor body 4 by mounting a locking member 24 that locks to the fixing portion 22b on the tip side of the protrusion 4d inserted into the hole 22e. May be. In this case, a known retaining ring can be used for the locking member 24. Note that the above-described fixing structure by caulking and the fixing structure by the locking member 24 can also be used for fixing the core ring 16 in the first embodiment.

Side surface sectional drawing of the electromagnetic clutch which shows the 1st Embodiment of this invention Front view of electromagnetic clutch Exploded side sectional view of main part of electromagnetic clutch Side surface sectional drawing of the electromagnetic clutch which shows the 2nd Embodiment of this invention Exploded side sectional view of main part of electromagnetic clutch The principal part disassembled side sectional view of an electromagnetic clutch showing a modification of the second embodiment The principal part expanded side sectional view of the electromagnetic clutch which shows a modification Main part enlarged side sectional view of an electromagnetic clutch showing another modification Side sectional view of electromagnetic clutch showing conventional example

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rotary shaft, 4 ... Compressor main body, 4a ... Support part, 4c ... Engagement part, 4d ... Protrusion, 10 ... Electromagnetic clutch, 11 ... Rotor, 16 ... Coring, 16b ... Fixed part, 17 ... Electromagnetic coil, 20 ... bolt, 21 ... locking member, 22 ... coring, 22b ... fixing part, 22c ... support part.

Claims (5)

A core ring disposed coaxially with the rotating shaft of the compressor, an electromagnetic coil provided in the core ring, and an annular rotor formed so as to surround the outer peripheral surface and the inner peripheral surface of the core ring, In the electromagnetic clutch of the compressor, the rotor is rotatably supported on the outer peripheral surface of the support portion extending in the axial direction from the compressor body.
An electromagnetic clutch for a compressor, wherein a fixing portion fixed to the compressor main body is integrally provided on the core ring, and the fixing portion is engaged with the compressor main body so that movement in a radial direction is restricted. . The electromagnetic clutch for a compressor according to claim 1, wherein the support portion is provided integrally with the core ring. The electromagnetic clutch for a compressor according to claim 1 or 2, wherein the fixing portion of the coring and the compressor main body are fixed by bolts. The electromagnetic clutch for a compressor according to claim 1 or 2, wherein the fixing portion of the coring and the compressor main body are fixed by deforming a part of the compressor main body and engaging the fixed portion with the fixing portion. . The electromagnetic of a compressor according to claim 1 or 2, wherein a fixing member that locks the fixing portion of the core ring and the compressor main body to the fixing portion side is fixed to the compressor main body side. clutch.

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