JP2008223926A - Magnetic power transmission device and its using method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic power transmission device in which a gap between a driven side disc magnet and a driving side cylindrical magnet is stable, there is no torque ripple, and the freedom in layout of the device is high. <P>SOLUTION: In this deice, the driving side cylindrical magnet 142 fixed to a drive shaft 140 and the driven side disc magnet fixed to a bearing-supported part 131 formed integrally with a driven shaft fastening element 130 disposed in the direction orthogonal to the drive shaft 140 are disposed so that the magnetic pole of the driving side cylindrical magnet 142 and the magnetic pole of the driven side disc magnet oppose each other via a predetermined gap; the drive shaft 140 is pivotally supported by a pair of box body side plates 110 disposed oppossingly and separated, and penetrating the box body side plates 110; the driving side cylindrical magnet 142 is fixed to the drive shaft 140 between the box body side plates 110; and the bearing-supported part 131 is pivotally supported by a box body connecting plate 120 connected orthogonally between end sides of the box body side plates 110. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a magnetic power transmission device that transmits power by a magnetic force between a drive shaft and a driven shaft, and more specifically, uses a magnetic gear to transmit rotational power from an orthogonal drive shaft to a driven shaft. The present invention relates to a magnetic power transmission device.

  For example, when driving a lifting device, a conveyor for conveyance, a shredder or the like with a motor, a power transmission device using a gear, a worm gear, or the like is widely used. Since such a conventional power transmission device meshes gears to transmit power, there is a problem in that gears wear and wear powder scatters or noise due to gear meshing occurs.

In order to solve such a problem, a magnetic gear having an N pole in the axial direction and an S pole alternately fixed on the cylindrical surface is used on the drive shaft side, and the magnetic pole is arranged in the circumferential direction on the disk surface. 2. Description of the Related Art A magnetic power transmission device that transmits power in a non-contact manner by using magnetic gears that are alternately fixed to S poles on the driven shaft side is known. Since this magnetic power transmission device generates very little dust such as wear powder, it is expected to be used in places where a clean environment is required such as a semiconductor manufacturing factory or a food manufacturing factory (for example, patent documents) 1 and 2).
Japanese Patent Laying-Open No. 2003-139213 (FIG. 1) Japanese Patent No. 2648565 (FIGS. 9 and 11)

  However, in the magnetic power transmission devices disclosed in Patent Document 1 and Patent Document 2, since the driven disk magnet is directly supported by the driven shaft, an offset load is applied to the driven disk magnet by the attractive force of the magnet. There was a possibility that the driven disk magnet would tilt and contact the driving cylindrical magnet.

  In addition, there is a problem that the gap between the driven-side disk magnet and the drive-side cylindrical magnet is not stable, and the power transmission efficiency fluctuates, that is, the torque ripple is large. Further, if a plurality of driven shafts are rotated by one drive source, the drive shaft becomes long, so that a shaft with high accuracy such as roundness and straightness is required, which causes an increase in manufacturing cost.

  In addition, since there is no fastening means for connecting the driven shaft and the driven device, a separate fastening means such as a coupling for connecting the magnetic power transmission device and the driven device is required. There is a problem that the apparatus becomes longer in the driven axis direction and the degree of freedom of the apparatus layout is reduced.

  Therefore, an object of the present invention is that the driven disk magnet does not tilt due to an offset load, the air gap between the driven disk magnet and the driving cylindrical magnet is stable, torque ripple is small, and a plurality of driven shafts are provided. An object of the present invention is to provide a magnetic power transmission device that can cope with the rotation of the motor without extending the drive shaft and has a high degree of freedom in device layout.

Therefore, the invention according to claim 1 is fixed to the drive shaft, and the drive side cylindrical magnet in which the magnetic poles are alternately arranged in the N-pole and S-pole in the axial direction, and the follower arranged in a direction orthogonal to the drive shaft. The drive-side cylindrical magnet is fixed to a bearing portion integrally formed with the shaft fastening element, and a driven-side disc magnet in which magnetic poles are alternately arranged in N and S poles in the circumferential direction via a predetermined gap. And the driven disk magnet are arranged so that the magnetic poles of the driven-side disk magnets face each other, and the rotational torque of the drive shaft is driven by using the magnetic attractive force and the magnetic repulsive force acting between the opposed magnetic poles. The drive shaft is supported by and penetrates a pair of housing side plates that are spaced apart from each other, and the drive side cylindrical magnet is connected to the housing side plate. Fixed to the drive shaft in between, and A magnetic type having a driven side guide portion into which a driven shaft is inserted inside while being supported by a case connecting plate connected orthogonally between the edges of a pair of case side plates placed The power transmission device solves the above problems.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the driving side cylindrical magnet has a driving side guide portion that aligns the yoke portion of the driving side cylindrical magnet with the axis of the driving shaft. The above-mentioned problem is further solved by being fixed to the drive shaft by a clamp mechanism that is configured integrally with the mounting base that also serves as the above.

  Furthermore, the invention according to claim 3 further solves the above problem by connecting a plurality of drive shafts of the magnetic power transmission device according to claim 1 or claim 2 via coupling means. is there.

  In the present invention, “bearing” means that an object is supported on the inner peripheral side, that is, supported by a bearing, and “yoke” is a line of magnetic force. It is a magnetic structure for passing through and means a magnetic material. Furthermore, the “driven disk magnet” is used in a broad sense including both magnetic poles alternately arranged in the circumferential direction with N and S poles and a support member that also serves as a yoke that supports the magnetic poles.

  In addition, “predetermined” in the description of “predetermined gap” is not limited to a specific value, and means, for example, a narrow interval for strengthening the binding force most. About 1.5 mm.

According to the first aspect of the present invention, the driven shaft fastening element and the bearing portion are integrated, so that when the magnetic power transmission device is installed in the device, the device-side driven shaft and the device are directly connected. And the device is miniaturized. Further, since the driven-side disk magnet is supported by the housing connecting plate by a bearing portion having a diameter larger than at least the diameter of the driven shaft, it becomes a large-diameter bearing, and the driven-side disk magnet can be tilted by an eccentric load. It is suppressed and contact with the drive side cylindrical magnet is prevented.
Furthermore, since the driven shaft is guided by the driven side guide portion of the bearing portion by providing the driven side guide portion into which the driven shaft is inserted inside the driven portion, the driven shaft and the driven disk magnet The shift of the shaft core can be suppressed, and further downsizing of the device can be achieved.

  In addition, the drive shaft is supported and passed between a pair of opposite housing side plates, and the drive side cylindrical magnet is fixed to the drive shaft between the case side plates, so that the driven shaft is driven. Since the gap between the side disk magnet and the drive side cylindrical magnet can be stabilized, torque ripple can be reduced.

Furthermore, the drive-side and driven-side magnetic gears are pivotally supported and modularized in a single casing constituted by a pair of casing side plates and a casing connecting plate connected orthogonally between their side edges. Therefore, when transmitting power to multiple driven shafts with one drive source, it is only necessary to connect the drive shafts of each module using coupling means, and high accuracy such as roundness and straightness is required. No need for long drive shafts.
Further, the leakage of magnetic flux to the outside can be reduced by using, for example, a non-magnetic material such as stainless steel or aluminum as the material of the case side plate and the case connecting plate constituting the case.

  According to the second aspect of the invention, in synergy with the effect of the first aspect of the invention, the drive-side cylindrical magnet is configured so that the yoke portion of the drive-side cylindrical magnet and the axis of the drive shaft coincide with each other. The clamp mechanism that is integrated with the mounting base that also serves as a guide portion is fixed to the drive shaft. Therefore, the drive-side cylindrical magnet and the drive shaft have the same axial center, and the drive-side cylindrical magnet has a small eccentricity. And the driven disk magnet are stabilized, and the magnetic force of the drive side cylindrical magnet can be increased by the action of the yoke. Furthermore, the drive side cylindrical magnet can be fixed to the position where the power can be transmitted most efficiently to the driven side disk magnet by a simple operation of tightening the screw of the clamp mechanism.

  According to a third aspect of the present invention, a plurality of drive shafts of the magnetic power transmission device according to the first or second aspect are coupled to each other via a coupling, so that the longness with high accuracy such as roundness and straightness is long. A conveying device such as a roller conveyor or a wheel conveyor can be easily configured without requiring a drive shaft.

  One embodiment of the present invention will be described based on Example 1 with reference to FIGS.

FIG. 1 is a perspective view showing an example of the magnetic power transmission device 100 according to the first embodiment. As can be seen from the internal structure of the magnetic power transmission device 100, the axial center of the driven shaft fastening element 130 is mainly shown. A part of the case connecting plate 120 and the case side plate 110R are cut away. FIG. 2 is a top view of the magnetic power transmission device 100 shown in FIG. 1 as viewed from above. FIG. 3 is a front view of the magnetic power transmission device 100 shown in FIG. 1 as viewed from the driven shaft fastening element 130 side. Figure 4
FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. FIG. 5 shows the magnetization pattern of the drive side cylindrical magnet 142 and the driven side disk magnet 150, where (a) is a spiral pattern and (b) is a fan pattern.

As shown in FIG. 2, the magnetic power transmission apparatus 100 according to the first embodiment includes a drive-side cylindrical magnet 142 in which N poles and S poles are alternately magnetized in a spiral shape at a predetermined pitch in the axial direction. In this way, the drive shaft 140 is fixed to the drive shaft 140 by a clamp mechanism 146 that is integrally formed with a mounting base 144 that also serves as a drive-side guide portion 145 that matches the yoke portion 147 of the drive-side cylindrical magnet 142 and the axis of the drive shaft. Yes. The drive shaft 140 is supported by bearings 148 and 148 embedded in a pair of housing side plates 110L and 110R that are spaced apart from each other. The type of bearing used here is not particularly limited, but it is preferable to use a rolling bearing with low noise and low friction.
In addition, since the clamp mechanism 146 configured integrally with the mounting base 144 that also serves as the yoke portion 147 of the driving side cylindrical magnet 142 is close to the central portion where the magnet of the driven side disk magnet 150 does not exist, the driven side disk magnet 150 The influence of the magnetic attractive force exerted on the clamping mechanism 146 is reduced. Here, the type of the clamp mechanism 146 is not particularly limited, but in the first embodiment, a slit-type clamp similar to a driven shaft fastening element 130 described later is used.

  This drive shaft 140 leaves a distance substantially equal to the distance between the pair of housing side plates 110L and 110R in order to prevent disconnection from the housing side plate 110 and shakiness in the axial direction, and performs cutting and the like on both ends. It is thin.

On the other hand, a driven disk magnet 150 is arranged in a direction orthogonal to the drive shaft 140. In this driven-side disk magnet 150, N-pole and S-pole magnetic poles are alternately arranged in the circumferential direction at the same pitch as the drive-side cylindrical magnet 142 on a support member 152 that also serves as a yoke. FIG. 5 shows examples of magnetization patterns of the driven disk magnet 150 and the drive side cylindrical magnet 142. (A) is a spiral pattern and (b) is a fan-shaped pattern. Each shows a 45 degree pitch in which eight magnets are alternately arranged in the circumferential direction with N and S poles. However, the magnetization pitch is not limited to this, for example, 12 pieces in the circumferential direction. It is also possible to set the pitch at 30 degrees where the magnets are arranged.

  The support member 152 that also serves as the yoke of the driven-side disk magnet 150 is fixed to a supported bearing portion 131 that is formed integrally with the driven shaft fastening element 130, and this supported bearing portion 131 is embedded in the housing connecting plate 120. It is supported by a bearing 134. The bearing portion 131 has a bottomed hollow shaft-shaped driven side guide portion 132 into which the driven shaft is inserted, and has a flange portion 131a on the driven shaft fastening element 130 side. .

  The driven shaft fastening element 130 is a so-called slit clamp that fixes the driven shaft by narrowing the width of the slit by inserting a slit in a part of the annular member and tightening with a screw as shown in FIG. Is used. In such a driven shaft fastening element 130, the shaft center is displaced, and in the present invention, the driven shaft fastening element 130 is provided with a bearing 131 having a slit and no driven side guide portion 132 into which the driven shaft is fitted. The shaft core is prevented from shifting. In addition, the length of the driven shaft fastening element 130 projecting from the housing connecting plate 120 is shortened by bearing the supported portion 131 by a bearing 134 embedded in the housing connecting plate 120.

  Further, as shown in FIG. 4, the bearing portion 131 has an outer diameter larger than the thickness of the driven shaft, and is used for fixing the bearing portion provided in the center of the support member 152 by cutting or the like. Therefore, the joint between the supported portion 131 and the support member 152 is extremely stable. In addition, since the collar 131a is in sliding contact with the outer surface of the bearing 134, even if a biased load is applied to the driven disk magnet 150 due to the magnetic attractive force between the driving cylindrical magnet 142 and the driven disk magnet 150, The driven-side disc magnet 150 is prevented from tilting and coming into contact with the drive-side cylindrical magnet 142.

  Furthermore, the distance from the back surface of the support member 152 to the bearing 134 is shortened by thinning the shoulder portion 120a provided in the housing connecting plate 120 for embedding and fixing the bearing 134 in the housing connecting plate 120. can do. As a result, the gap between the driven-side disc magnet 150 and the drive-side cylindrical magnet 142 is more stably supported even when an offset load is applied due to the magnetic attractive force.

  In the first embodiment described above, a slit-type clamp is used as the driven shaft fastening element, but half of the cylindrical portion of the driven shaft fastening element 230 protruding from the housing connecting plate 220 is cut out as shown in FIG. Thus, a so-called two-part clamp is used in which the driven shaft 260 is fixed by clamping the driven shaft 260 between the annular semicircular member 232 and the driven shaft fastening element 230 and tightening the annular semicircular member 232 with a screw. ing. By using the two-part clamp, the axis of the driven disk magnet 250 and the driven shaft 260 can be aligned without using the driven guide portion. Since the other points are the same as those in the first embodiment, the third digit of the reference number of the corresponding member is set to 2, and the lower two digits are shown in a matching manner, and the detailed description is omitted.

Next, a usage method utilizing the effect produced by the magnetic power transmission device shown in the first or second embodiment will be described with reference to FIG. FIG. 7 shows a case where a plurality of drive shafts 340 of the magnetic power transmission device 300 described above are connected via a coupling 380 and a joint 370, and a driven shaft 360 having a wheel 362 spaced apart is provided as a driven shaft fastening element. A part of the connected wheel conveyor is shown. Reference symbol M indicates a conveyed product. As described above, in the magnetic power transmission device 300 according to the present invention, the drive shaft 340 and the driven shaft fastening element are modularized. Therefore, the drive shaft 340 is simply rotated by the coupling 380 and the rotation is equal to each driven shaft. A device for transmitting power can be configured. Therefore, a conveying device such as a roller conveyor or a wheel conveyor can be easily configured without requiring a long drive shaft with high accuracy such as roundness and straightness. Further, since it is not necessary to separately provide coupling means for connecting the driven shaft and the magnetic power transmission device 300, for example, the distance between the driven device such as a transport device and the magnetic power transmission device 300 is shortened. This increases the degree of freedom in device layout.

  In the example shown in FIG. 7, according to the size of the conveyed product M, the adjacent magnetic power transmission device 300 is connected between the two couplings 380 via the joint 370 with a large interval. It is also possible to shorten the distance between the wheels 362 by directly connecting the drive shafts of the magnetic power transmission devices 300 with the coupling 380.

The perspective view which shows the state which notched some magnetic power transmission devices of Example 1. FIG. FIG. 2 is a top view of the magnetic power transmission device shown in FIG. 1. The front view of the magnetic type power transmission device shown in FIG. Sectional drawing when cut | disconnecting by the IV-IV line of FIG. The front view which showed the magnetization pattern of the magnetic gearwheel of the magnetic type power transmission device shown in FIG. FIG. 6 is a perspective view showing a magnetic power transmission device according to a second embodiment. The perspective view which showed a part of wheel conveyor using the magnetic type power transmission device of Example 3. FIG.

Explanation of symbols

100, 200, 300 ... Magnetic power transmission device 110 (110L, 110R), 210 (210L, 210R) ... Case side plate 120, 220 ... Case connection plate 120a ... Shoulder stop portion 130 , 230, driven shaft coupling element 131, bearing portion 131 a, flange portion 132 (of the bearing portion), driven side guide portion 134, bearings 140, 240 (on the driven shaft side) 340 ... drive shaft 142, 242 ... drive side cylindrical magnet 144 ... mounting base 145 ... drive side guide part 146, 246 ... clamp mechanism 147 ... yoke part 148 ... ( Bearings 150, 250 on the drive shaft side ... Driven disk magnets 152, 252 ... Support members 260, 360 ... Driven shaft 370 ... Joint 380 ... Cup Packaging

Claims (3)

A drive-side cylindrical magnet fixed to the drive shaft and having magnetic poles arranged alternately in the N and S poles in the axial direction and a driven shaft fastening element arranged in a direction perpendicular to the drive shaft are integrally formed. A driven-side disk magnet fixed to the bearing portion and having magnetic poles arranged alternately in the circumferential direction in the N and S poles is connected to the magnetic pole of the driving-side cylindrical magnet and the driven-side disk magnet via a predetermined gap. The magnetic power transmission device is arranged so that the magnetic poles are opposed to each other, and transmits the rotational torque of the drive shaft to the driven shaft using a magnetic attractive force and a magnetic repulsive force acting between the opposed magnetic poles. And
The drive shaft is supported by and penetrates a pair of housing side plates that are spaced apart from each other, and the drive side cylindrical magnet is fixed to the drive shaft between the housing side plates.
The driven-side guide in which the bearing portion is supported by a casing connecting plate that is orthogonally connected between the edges of the pair of spaced-apart casing side plates and into which the driven shaft is inserted. A magnetic power transmission device comprising a portion.   The drive-side cylindrical magnet is fixed to the drive shaft by a clamp mechanism that is integrally formed with a mounting base that also serves as a drive-side guide portion that aligns the yoke portion of the drive-side cylindrical magnet and the axis of the drive shaft. The magnetic power transmission device according to claim 1, wherein: A method of using a magnetic power transmission device, wherein a plurality of drive shafts of the magnetic power transmission device according to claim 1 or 2 are connected via a coupling means.

Images