JP2005048793A - Magnet type fan clutch device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnet type fan clutch device miniaturized in a magnet coupling, improved in flow capacity and improved in durability of a bearing device. <P>SOLUTION: This magnet type fan clutch device is formed by combining the magnet coupling with an electromagnetic clutch and fitting a fan to the magnet coupling so that the magnet coupling is controlled for ON/OFF by the electromagnetic clutch. Conductors are arranged in both sides of a permanent magnet of the magnet coupling to transmit the torque in both surfaces of the permanent magnet. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic fan clutch device that controls rotation of a cooling fan mainly applied to an internal combustion engine for a vehicle, has low noise and low fuel consumption, and has little shock at the initial stage of rotation, and more specifically, a magnet coupling and electromagnetic The present invention relates to a magnet type fan clutch device in which a clutch is integrated and a magnet coupling is controlled on and off by an electromagnetic clutch.
[0002]
[Prior art]
Conventionally, as this type of magnet type fan clutch device, for example, a clutch rotor that is supported on a drive shaft and incorporated with an excitation coil supported externally, and is rotatably supported on the drive shaft via a bearing device. A rotatable electromagnetic clutch comprising an armature attached to a circular disc, a permanent magnet rotating body rotatably supported on the drive shaft via a bearing device, and a fan attached to the outer periphery thereof, and the permanent magnet And the hysteresis material or conductor attached to the disk so as to face each other with a slight gap, and the permanent magnet rotating body and the disk are integrated by an attractive action acting between the permanent magnet and the hysteresis material or conductor. Or a magnetic coupling that is relatively rotated, and the magnetic clutch is coupled by the electromagnetic clutch. There is such that without the ON / OFF-controlled by a mechanism (see Patent Documents 1 and 2).
[0003]
Further, in Patent Document 1, in the case of a magnet type fan clutch device in which a magnet coupling and an electromagnetic clutch are integrated, dust (dust, metal powder, etc.) or moisture in a slight gap between a permanent magnet and a conductor, etc. In order to prevent the intrusion, a type in which various seal structures are provided between the permanent magnet rotating body and the conductor support is also described.
[0004]
The magnet type fan clutch device having such a configuration can control magnet coupling, that is, fan rotation by ON / OFF control of the electromagnetic clutch, and the electromagnetic clutch includes cooling water temperature, throttle opening, engine rotation speed, Since ON / OFF control is linked to the air conditioner switch, the fan rotation can be controlled accurately and stably, and dust (dust, metal powder, etc.) and moisture in a slight gap between the permanent magnet and the conductor Can be prevented from entering, so that there is an excellent effect that there is no possibility of causing a functional failure due to dust or moisture.
[0005]
[Patent Document 1] Japanese Patent Laid-Open No. 2002-195303 [Patent Document 2] Japanese Patent Laid-Open No. 2003-156072
[Problems to be solved by the invention]
However, the conventional magnet type fan clutch device described above has a structure in which any magnet coupling transmits torque only on one side of the permanent magnet, so that the permanent magnet rotates by the attraction acting between the permanent magnet and the conductor. The bearing device of the body and conductor support is subject to a so-called thrust load, which has the disadvantage of reducing the durability (life) of the bearing device, and the inner diameter of the fan blade cannot be reduced, so there is a limit to downsizing the fan clutch outer diameter. There was no increase in air volume.
[0007]
The present invention has been made to solve the problems of the conventional magnet fan clutch device described above, and by using both sides of the permanent magnet constituting the magnet coupling for torque transmission, the magnet coupling can be reduced in the radial direction. It is an object of the present invention to provide a magnet-type fan clutch device that achieves a higher air flow rate and a higher fan fan and improves the durability of the bearing device of the magnetic coupling.
[0008]
[Means for Solving the Problems]
The magnet type fan clutch device according to the present invention has a mechanism in which a magnet coupling and an electromagnetic clutch are combined, a fan is mounted on the magnet coupling side, and the magnet coupling is ON / OFF controlled by the electromagnetic clutch. In the magnet type fan clutch device, (1) a mechanism is provided in which conductors are arranged on both sides of the permanent magnet of the magnet coupling, and torque is transmitted on both sides of the permanent magnet, and (2) The permanent magnet of a permanent magnet rotating body that rotates integrally with the drive shaft, a conductor disposed on both sides of the permanent magnet so as to face both surfaces of the magnet with a slight gap, and a seal that rotatably supports the conductor A magnetic coupling is configured with a shaped casing.
Further, the permanent magnet rotor is configured by arranging permanent magnets on the outer periphery of a disk formed by a casting method, or by fixing the outer periphery of a group of permanent magnets arranged on the outer periphery of the disk with a ring. A thing etc. can be used.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
1 is a longitudinal side view showing an embodiment of a magnet type fan clutch device corresponding to claims 1 and 2 of the present invention, and FIG. 2 is a front view showing a permanent magnet rotor in the magnet type fan clutch device shown in FIG. 3 is a cross-sectional view taken along the line aa in FIG. 2, FIG. 4 is a front view showing another embodiment of the permanent magnet rotor, FIG. 5 is a cross-sectional view taken along the line bb in FIG. These are the longitudinal side views which show the other Example of the magnet type fan clutch apparatus of this invention, 11 and 31 are a drive shaft, 12 and 32 are electromagnetic clutches, 13 and 33 are magnet couplings, 14 is a spindle, 15 Is a rotation transmission housing, and 16 and 40 are fans.
[0010]
The magnet type fan clutch device shown in FIG. 1 comprises an electromagnetic clutch 12 provided on the support shaft 14 side and a magnet coupling 13 provided on the drive shaft 11 side. The electromagnetic clutch 12 is fixed to an engine block or the like. Clutch rotor 12-1 with pulley 12-1a rotatably supported on bearing 14 by bearing device 21, and attached to the base side of support shaft 14 provided in clutch rotor 12-1. The exciter coil 12-2 attached via the bracket 12-3 and the exciter coil 12-2 side of the rotation transmission housing 15 rotatably supported on the support shaft 14 by the bearing device 22 can be moved back and forth. The armature 12-4 is externally fitted to the support shaft 14, and one end of the armature 12-4 is transmitted by a bolt 12-6. A stator 12-5 fixed to the housing 15, is mounted opposite to the clutch rotor 12-1 via a spring 12-7 which is fixed at one end to said stator 12-5.
[0011]
The magnet coupling 13 includes a case 13-1 and a cover which are rotatably supported on the drive shaft 11 which is fastened to the rotation transmission housing 15 by a bolt 17 on the same axis as the support shaft 14 via a bearing device 23. A permanent magnet rotator 13-3 attached to the drive shaft 11 with a bolt 18 is accommodated in a sealer casing (casing) composed of 13-2, and is attached to the permanent magnet rotator 13-3. On both sides of the permanent magnet 13-3a, conductors (or hysteresis materials) 13-4a and 13-4b facing the magnet with a slight gap are respectively placed on the inner wall of the case 13-1 and the cover 13-2. -5a, 13-5b, and attracted by eddy currents acting between the permanent magnet 13-3a and the conductors (or hysteresis materials) 13-4a, 13-4b on both sides thereof. With the permanent magnet rotating body 13-3, the conductor 13-4a, the sealed housing having 13-4b is configured as to rotate or rotate relative together by. The fan 16 is attached to the case 13-1 constituting the sealer bowl. 13-6 is a radiation fin.
[0012]
The permanent magnet rotating body 13-3 has a multipolar structure as shown in FIG. 2 and FIG. 3, for example, a disk-shaped permanent magnet 13- having an integrated structure on the outer periphery of a disk 13-3b made of an aluminum casting. A structure in which a material for 3a is cast, and then a permanent magnet 13-3a is alternately excited with a north pole and a south pole, or as shown in FIGS. 4 and 5, a split structure is formed on the outer periphery of the disk 13-3c. Permanent magnet 13-3a is arranged as four segments excited alternately with N pole and S pole, and further, a ring 13-3d is fixed to the outer periphery of the permanent magnet group with bolts 13-3e Can be used. In addition, the integral permanent magnet 13-3a in the permanent magnet rotor of the multipolar structure shown in FIGS. 2 and 3 is cast on the outer periphery of the disk 13-3b, and the multipolar structure shown in FIGS. In the permanent magnet 13-3a of the permanent magnet rotating body, each segment is coupled to the outer periphery of the disk 13-3c by an uneven fitting method. Reference numeral 13-3f denotes a fastening bolt hole.
[0013]
In the magnet type fan clutch device having the configuration shown in FIG. 1, when the electromagnetic clutch 12 is turned on while the clutch rotor 12-1 is rotating via the pulley 12-1a, the magnet fan clutch device is provided in the clutch rotor 12-1. By the exciting coil 12-2, the armature 12-4 supported by the support shaft 14 so as to be movable back and forth is attracted and attracted to the clutch rotor 12-1, and the clutch rotor 12-1, the armature 12-4 and the rotation are transmitted. The housing 15 rotates together. When the rotation transmission housing 15 rotates, the fan 16 is rotated by the magnet coupling 13 provided on the drive shaft 11 fastened to the rotation transmission housing 15. That is, when the permanent magnet rotating body 13-3 attached to the drive shaft 11 rotates integrally, a sealer casing (casing) composed of the case 13-1 and the cover 13-2 becomes the permanent magnet 13-3a. The fan 16 attached to the case 13-1 of the sealer cage rotates by the suction action acting between the conductors (or hysteresis members) 13-4a and 13-4b on both sides. At this time, since the magnet coupling 13 is used for torque transmission on both sides of the permanent magnet 13-3a, the transmission torque is significantly larger (about 50%) than the conventional magnet coupling in which torque transmission is performed only on one side of the permanent magnet. In addition, the bearing device 23 is not subjected to a thrust load when the electromagnetic clutch 12 is turned on or turned on, so that the durability (life) of the bearing device is also improved.
[0014]
In the magnet type fan clutch device shown in FIG. 6, an electromagnetic clutch 32 is disposed on the drive side of the drive shaft 31 and a magnet coupling 33 is disposed on the opposite side to the drive side. A clutch rotor 32-1 that is integrally supported at the end of the coil, and an exciting coil that is rotatably fitted in the clutch rotor via a bearing device 34 and fixed to the outside via a bracket 32-3. 32-2 and an armature 32-4 supported by a permanent magnet rotating body 33-3 rotatably supported on the drive shaft 31 via a bearing device 35 via a spring 32-5. In addition, the magnet coupling 33 is disposed in a casing including a case 33-1 and a cover 33-2 that are rotatably supported on the drive shaft 31 via a bearing device 36. A permanent magnet rotating body 33-3 rotatably supported via a bearing device 35 is accommodated in the drive shaft 31, and the magnet and the permanent magnet 33-3a mounted on the permanent magnet rotating body 33-3 are placed on both sides. Conductors (or hysteresis members) 33-4a and 33-4b that are opposed to each other with a slight gap are attached to the inner walls of the case 33-1 and the cover 33-2 via core members 33-5a and 33-5b, respectively. The permanent magnet rotating body 33-3 and the conductor 33-4a are attracted by an attractive action accompanied by eddy currents acting between the permanent magnet 33-3a and conductors (or hysteresis materials) 33-4a and 33-4b on both sides thereof. , 33-4b are configured so as to rotate together or rotate relative to each other. The fan 40 is attached to the case 33-1 side. 33-6 is a radiation fin, 37 is a spacer, 38 is a nut for mounting the bearing device 36, and 39 is a fixing plate.
As the permanent magnet rotating body 33-3, one having a multipolar structure similar to that shown in FIGS. 2 and 3 can be used.
[0015]
In the case of the magnet type fan clutch device having the configuration shown in FIG. 6, when the electromagnetic clutch 32 is turned on while the drive shaft 31 is rotating, it is provided in the clutch rotor 32-1 that rotates integrally with the drive shaft 31. The excited coil 32-2 attracts the armature 32-4 held by the permanent magnet rotor 33-3 on the magnet coupling 33 side via the spring 33-5 and attracts it to the clutch rotor 32-1. The clutch rotor 32-1, the armature 32-4, and the permanent magnet rotating body 33-3 rotate integrally. When the permanent magnet rotating body 33-3 is rotated, the fan 40 is rotated by the magnet coupling 33 provided on the drive shaft 31.
That is, the permanent magnet rotating body 33-3 rotatably supported by the drive shaft 31 via the bearing device 35 rotates integrally with the clutch rotor 32-1, so that the case 33-1 and the cover 33-2 are separated. And the fan 40 attached to the casing case 33-1 is rotated by a suction action acting between the permanent magnet 33-3a and the conductors (or hysteresis members) 33-4a and 33-4b on both sides thereof. . At this time, similarly to the one shown in FIG. 1, the magnet coupling 33 is used for torque transmission on both sides of the permanent magnet 33-3a. Therefore, compared to the conventional magnet coupling in which torque transmission is performed only on one side of the permanent magnet. Not only is the transmission torque significantly improved (about 50%), but the bearing device 35, 36 is not subjected to a thrust load when the electromagnetic clutch 32 is turned on or turned on. ) Will also improve.
[0016]
Also in the case of the magnet type fan clutch device of the present invention shown in FIGS. 1 and 6, the rotation of the fans 16 and 40 can be controlled by turning the electromagnetic clutches 12 and 32 ON / OFF. Further, since the electromagnetic clutches 12 and 32 are ON / OFF controlled in conjunction with the coolant temperature, the throttle opening, the engine speed, and the air conditioner switch, the fan rotation can be controlled accurately and stably.
[0017]
Further, the magnet type fan clutch device shown in FIG. 1 has a permanent seal 13-3a because the magnet coupling 13 is a completely sealed type provided in a seal box made up of a case 13-1 and a cover 13-2. Intrusion of dust (dust, metal powder, etc.) or moisture into a slight gap between the conductors (or hysteresis materials) 13-4a and 13-4b can be completely prevented. Further, in the case of the magnet type fan clutch device shown in FIG. 6, the permanent magnet 33-3a and the conductor (the conductor (3) are reduced by reducing the gap between the casing cover 33-2 and the permanent magnet rotating body 33-3 as much as possible. Alternatively, it is possible to almost completely prevent dust (dust, metal powder, etc.) or moisture from entering a slight gap between the hysteresis members 33-4a and 33-4b.
[0018]
【The invention's effect】
As described above, the magnet type fan clutch device according to the present invention has the following effects by using both surfaces of the permanent magnet of the magnet coupling for torque transmission.
(1) Since the transmission torque is greatly improved compared to the conventional magnet coupling in which torque is transmitted only on one side of the permanent magnet, the size of the magnet coupling and fan can be reduced in the radial direction and / or the fan can have a higher air flow rate. I can take off.
(2) Since a thrust load is not applied to the magnet coupling bearing device, the durability (life) of the bearing device is improved.
(3) Since the magnet coupling is hermetically sealed, it is possible to completely prevent dust (dust, metal powder, etc.) and moisture from entering the slight gap between the permanent magnet and the conductor (or hysteresis material). In addition, since there is no functional failure due to dust, moisture, etc., the function as a magnet type fan clutch device is always kept good.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing an embodiment of a magnet type fan clutch device corresponding to claims 1 and 2 of the present invention.
2 is a front view showing a permanent magnet rotor in the magnet type fan clutch device shown in FIG. 1. FIG.
3 is a cross-sectional view taken along the line aa in FIG.
FIG. 4 is a front view showing another embodiment of the permanent magnet rotor according to the first embodiment.
5 is a cross-sectional view taken along line bb in FIG.
FIG. 6 is a longitudinal side view showing another embodiment of the magnet type fan clutch device of the present invention.
[Explanation of symbols]
11, 31 Drive shaft 12, 32 Electromagnetic clutch 13, 33 Magnet coupling 14 Support shaft 15 Rotational transmission housing 16, 40 Fan 21, 22, 23, 34, 35, 36 Bearing device 37 Spacer 38 Nut 39 Fixing plate

Claims (2)

In the magnet-type fan clutch device in which a magnet coupling and an electromagnetic clutch are combined, a fan is attached to the magnet coupling side, and the magnet coupling is controlled to be turned on / off by the electromagnetic clutch. A magnet type fan clutch device characterized in that a conductor is arranged on both sides of a permanent magnet of a ring and torque is transmitted on both sides of the permanent magnet. In a magnet type fan clutch device in which a magnet coupling and an electromagnetic clutch are combined, a fan is attached to the magnet coupling side, and the magnet coupling is controlled on and off by the electromagnetic clutch. The permanent magnet of a permanent magnet rotating body that rotates integrally, a conductor disposed on both sides of the permanent magnet so as to face both sides of the magnet with a slight gap, and a sealed casing that rotatably supports the conductor A magnet type fan clutch device comprising the magnet coupling.

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