WO2005063600A1

WO2005063600A1 - Power transmission unit, apparatus for manufacturing the same and conveyor using the same

Info

Publication number: WO2005063600A1
Application number: PCT/KR2004/003291
Authority: WO
Inventors: Shang-In Shin
Original assignee: Shang-In Shin
Priority date: 2003-12-30
Filing date: 2004-12-14
Publication date: 2005-07-14

Abstract

Disclosed is a power transmission unit, and more particularly a power transmission unit for transmitting power without contact by means of magnetic force, an apparatus for manufacturing the unit, and a conveyor using the power transmission unit. In order to transmit power between first and second shafts angled to each other, the power transmission unit includes a first rotator fixed to the first shaft and having fan-shaped N and S poles alternately formed on a first conical surface; and a second rotator fixed to the second shaft and having fan-shaped S and N poles alternately formed on a second conical surface, the first and second conical surfaces being arranged with a gap therebetween so that a magnetic field adherence space is successively formed during power transmission.

Description

POWER TRANSMISSION UNIT, APPARATUS FOR MANUFACTURING THE SAME AND CONVEYOR USING THE SAME

TECHNICAL FIELD The present invention relates to a power transmission unit, and more particularly to a power transmission unit for transmitting power without contact by means of magnetic force, an apparatus for manufacturing the unit, and a conveyor using the power transmission unit.

BACKGROUND ART Generally, a conveyor is defined as a machine for automatically and successively conveying materials or goods a certain distance. In order to operate such a conveyor used as a conveying means, there is required a combination of transmission means for transmitting a driving force of a driving motor to rollers of the conveyor. For example, a roller shaft of the conveyor is rotated by means of a transmission means such as a chain, a belt, a worm gear or a bevel gear. However, such transmission means has problems of noise and vibration together with dust caused by abrasion since teeth of a driving gear and a driven gear are engaged to transmit power. That is to say, a clearance of gear teeth between the driving gear and the driven gear that are engaged to rotate together may cause vibration of the roller shaft or generate dust due to abrasion. Particularly for a very precise product, dust or vibration generated in the transmission means becomes a direct factor of inferiority of products conveyed by the conveyor . Thus, a transmission means using a permanent magnet gear of a helical type is recently used. For example, there is Korean Laid-Open Patent Publication No. 2003- 0038262, filed by SFA co. ltd. on 10 November 2001. In this specification, a permanent magnet assembly includes a driving gear provided with a plurality of permanent magnets having N poles and S poles alternately attached to outer sides of a driving shaft to have a predetermined angle to an axial direction of the driving shaft that rotates by a driving force of the driving motor, and a driven gear spaced apart from the driving gear by a predetermined distance and provided with a plurality of permanent magnets having N poles and S poles alternately attached to an outer side of the driven gear to have a predetermined angle to an axial direction of the driven shaft orthogonal to the driving shaft. According to this configuration, the conventional permanent magnet assembly may accurately transmit a driving force of the driving motor to the driven gear, or the roller shaft of the conveyor, without noise and vibration by means of the plurality of permanent magnets alternately attached to the outer sides of the shaft of the driving gear and the driven gear. That is to say, since the driving force is transmitted in a non-contact fashion, lubricant for minimizing frictional force between gears is not required. In addition, since dust is not generated, thus reducing environmental contamination, it may be effective in a work place that requires a high level of cleanliness, for example, a semiconductor production line. However, since the outer sides of the driving shaft and the driven shaft are driven in an oppositely orthogonal state, the conventional permanent magnet assembly has a small magnetically facing area, such that the assembly has a problem that transmission torque from the driving gear to the driven gear is small. Namely, since the driving shaft and the driven shaft are mutually orthogonal in a helical type in the conventional permanent magnet assembly, the permanent magnets alternately attached in the predetermined direction to each shaft are operated orthogonally in a state wherein they are inclined by a predetermined angle. Thus, the mutually facing area is limited to a certain extent, which severely limits the power transmitted from the driving gear to the driven gear, such that the gears are apt to idle. Accordingly, the conventional assembly cannot be used for a conveyor requiring a large amount of torque.

DISCLOSURE OF THE INVENTION Therefore, the present invention is designed to solve the problems of the prior art, and it is an object of the present invention to provide a power transmission unit capable of preventing first and second rotators from idling by forming a magnetic field adherence space with a wide mutually-adhered area when the first and second rotators transmit power and thus maximizing power transmission, and a conveyor using the power transmission unit . Another object of the invention is to provide a power transmission unit allowing transmission of a large amount of force and facilitating easy process design. Still another object of the invention is to provide an apparatus for easily manufacturing the first and second rotators . In order to accomplish the above object, the present invention provides a power transmission unit, mutually adhered through a linear magnetic field space, for transmitting power between first and second shafts angled to each other, which includes a first rotator fixed to the first shaft and having fan-shaped N and S poles alternately formed on a first conical surface; and a second rotator fixed to the second shaft and having fan- shaped S and N poles alternately formed on a second conical surface, the first and second conical surfaces being arranged with a gap therebetween so that a magnetic field adherence space is successively formed during power transmission. In the power transmission unit according to such an aspect of the invention, the fan-shaped N and S poles are formed on the conical surface of the rotator fixed to each shaft with a gap between the first and second shafts angled to each other so that polarities on the conical surfaces of the rotators are opposite to each other, so that attractive force is generated by means of the magnetic field acting upon the first and second conical surfaces faced with each other by the first and second shafts angled at each other, thereby being capable of transmitting power therebetween. In particular, since each pole alternately formed on the conical surface of each rotator is formed in a longitudinal direction against the rotator, the opposite poles are rotated in a line contact way, not in one point contact, so that the magnetic facing area where opposite poles of each conical surface meet is increased to maximize the power transmission between the first and second shafts. Meanwhile, in another aspect of the invention, to accomplish the above object, there is also provided an apparatus for manufacturing a power transmission unit mutually adhered through a linear magnetic field space, which magnetizes first and second rotators so that fan- shaped N and S poles are formed on first and second conical surfaces mounted to first and second shafts angled to each other to transmit power, wherein a conical hole is formed at an inner center of an iron core frame bundle so that the conical surfaces of the rotators a high level of cleanliness, for example, are inserted in contact with an inner surface of the conical hole, wherein a plurality of iron cores are radially provided to the iron core frame bundle around the conical hole through a plurality of coil winding spaces, wherein coils with different polarities of supply electricity are alternately wound in the coil winding space adjacent to each iron core. According to such an aspect of the present invention, it is possible to manufacture a rotator having fan-shaped N and S poles on the conical surface by using the apparatus for manuf cturing a power transmission unit according to the present invention. In addition, according to another aspect of the present invention in order to accomplish the present invention, there is also provided a conveyor using a power transmission unit mutually adhered through a linear magnetic field space, which includes a plurality of first rotators mounted to one long driving shaft, each having fan-shaped N and S poles alternately formed on a first conical surface thereof; and a plurality of second rotators mounted to each end of a plurality of driven shafts arranged and rotated orthogonal to the driving shaft and configuring a conveyor carrying unit, each of the second rotators having fan-shaped S and N poles alternately formed on a second conical surface conversely to those on the first conical surface, the first and second conical surfaces being arranged with a gap therebetween to successively form magnetic field adherence spaces during power transmission.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view schematically showing a power transmission unit according to an embodiment of the present invention; FIG. 2 is a schematic view showing a rotator of the power transmission unit shown in FIG. 1; FIG. 3 is a sectional view taken along A-A line of FIG. 2; FIG. 4 is a perspective bottom view illustrating .a magnetizing device of a power transmission unit according to another embodiment of the present invention; FIG. 5 is a sectional view showing the inserted state of the rotator; FIG. 6 is a perspective view schematically showing a power transmission unit according to another embodiment of the present invention; FIG. 7 is a schematic view showing a rotator of the power transmission unit shown in FIG. 6; FIG. 8 is a sectional view taken along line B-B of FIG. 7; FIG. 9 is a perspective bottom view showing a rotator magnetizing apparatus of a power transmission unit according to a modification of FIG. 7; FIG. 10 is a sectional view showing a state wherein the rotator of FIG. 9 is inserted; and FIG. 11 is a perspective view showing a conveyor using the power transmission unit according to another embodiment of the present invention.

BEST MODES FOR CARRYING OUT THE INVENTION These and additional, aspects of the present invention will be more apparently understood by means of the following preferred embodiments referring to the accompanying drawings. Hereinafter, the present invention will be described in more detail through such embodiments so that persons skilled in the art may easily understand and reproduce the invention. FIG. 1 is a perspective view schematically showing a power transmission unit according to a preferred embodiment of the present invention. As shown in FIG. 1, the power transmission unit of the present invention includes a first rotator 1 fixed to a first shaft Si and having fan-shaped N and S poles 3 and 4 alternately formed on a first conical surface 11, and a second rotator 2 fixed to a second shaft S2 and having fan-shaped S and N poles 4 and 3 alternately formed on a second conical surface 21 opposite those on the first conical surface 11. The first and second conical surfaces

11 and 21 are disposed with a certain spacing therebetween. In addition, the first and second shafts SI and S2 are orthogonal to each other, and the first and second conical surfaces 11 and 21 are inclined at 45 respectively. According to such configuration, the power transmission unit of the present invention transmits power between the shafts with the first and second shafts being orthogonal in a plane. At this time, since each conical rotator fixed to each of the first and second shafts is inclined at 45 as mentioned above, the angle between the conical rotators fixed to the first and second shafts is also rectangular. That is to say, the power transmission unit of the present invention is arranged in a bevel gear type, thereby transmitting a longitudinal driving force of the driving motor in the lateral direction. At this time, on the conical surface, or an inclined surface, of each conical rotator, the fan-shaped N and S poles are alternately formed in a longitudinal direction parallel to the shaft, and each conical surface 11 or 21 of the first and second rotator has a different polarity arrangement on its surface opposite to each other with a certain gap. For example, if the polarities are arranged on the conical surface 11 of the first rotator, fixed to the first shaft, in the order of N, S, N and S, the polar arrangement on the corresponding conical surface 21 of the second rotator is in the order of S, N, S and N. Thus, by means of such configuration, different poles are arranged on the opposite conical surfaces in the power transmission unit of the present invention, such that the first and second rotators transmit the driving power without being in contact with one another by means of attractive force generated between the first and second conical surfaces. Namely, magnetization generated by different poles allows power to be transmitted through a gap without engagement of the first and second rotators. That is to say, according to the peculiar aspect of the present invention, the first and second rotators rotate in a non-contact state, while spaced apart from each other, by means of magnetization, since the fan- shaped N and S poles are alternately arranged on the conical surfaces. At this time, since a linear magnetic field space is formed through the N and S poles on the opposite conical surfaces, or the inclined surfaces, a magnetically facing area where the opposite magnetic poles on the conical surfaces encounter one another is greater than that of the conventional permanent magnet assembly of a helical type, thereby maximizing the power transmission between the first and second shafts. In particular, since the first and second conical surfaces of the first and second rotators are operated orthogonally, a driving torque is changed in proportion to the size of the permanent magnet, or a size of the rotator, due to magnetic facing. In addition, since the first and second rotators are spaced apart from each other and transmit power in a non- contact state by means of attractive force of the magnetic poles formed on each conical surface, lubricant conventionally used for minimizing a frictional force between gears is not required and it may be effective in a work place that requires a high level of cleanliness, for example, a semiconductor production line. Meanwhile, each pole arranged on the first and second conical surfaces, which are inclined, orthogonally opposite surfaces, is formed using a magnet body. For example, as shown in FIGs . 2 and 3, each of the poles alternately arranged on each conical surface is formed using a long magnetic body with a single polarity. At this time, grooves 12 and 22 are radially formed at regular intervals on the first and second conical surfaces 11 and 21, so magnetic bodies 31 and 41 are inserted and attached to the grooves 12 and 22 by means of adhesive. That is to say, in the preferred embodiment of the present invention, each rotator 1 or 2 is made of nonmagnetic material, and each pole 3 and 4 formed on the conical surface of this rotator is formed using a plurality of magnetic bodies 31 and 41, each having a single polarity such as N or S. If the rotator is made using the magnetic bodies having single polarity differently, it is possible to easily manufacture the rotator by means of simple processing without any special tool for producing a permanent magnet. In addition, since the rotator may be made in various sizes as required, it is possible to make the rotator in a large size to transmit more power. However, the first and second rotators 1 and 2 may be configured using magnetic material, not the non-magnetic material mentioned above. Namely, the rotator itself may be a permanent magnet with different polarities on the conical surface by using a separate device. In the case that the rotator is made using the permanent magnets as mentioned above, the rotator may be made integrally using the magnetizing device shown in FIG. 4. FIG. 4 is a perspective bottom view illustrating a rotator magnetizing device of a power transmission unit according to still another embodiment of the present invention, and FIG. 5 is a sectional view showing that the rotator of FIG. 4 is inserted. The apparatus for manufacturing a power transmission unit according to the present invention magnetizes the first and second rotators 1 and 2 so that fan-shaped N and S poles are formed on the first and second conical surfaces 11 and 21 mounted to the first and second shafts, installed at an angle, to transmit power. That is to say, as shown in FIG. 4, the apparatus for manufacturing rotator has a conical hole 20 at the inner center of a bundle of iron core frames 10 so that the conical surfaces 11 and 21 of the rotator 1 and 2 may be inserted therein in contact with the inner surface thereof. A plurality of iron cores 40 are provided to the bundle of iron core frames 10 around the conical hole 20 through a plurality of coil winding spaces 30. Coils 50 with different polarity of supply electricity are alternately wound in the coil winding spaces 30 adjacent to each iron core 40. According to such configuration, as shown in FIG. 5, the, highly-magnetic, rotators 1 and 2magnetismare inserted into the conical hole 20 formed at the inner center of the iron core frame bundle 10 in close contact with the inner surface thereof. In addition, if power is supplied to the coils 50 wound around each iron core 40 with different polarities, the conical surface that is an inclined surface of the rotator is magnetized to have polarity corresponding to polarity of each coil. At this time, the magnets formed on the conical surfaces 11 and 21 of the rotator are formed in a fan shape by means of the iron cores formed by the magnetizing device. Accordingly, the rotator of the power transmission unit of the present invention may be mass-produced by means of the magnetizing device, and, particularly, power may be more accurately transmitted since each polarity is arranged by means of magnetization. Meanwhile, the rotators configuring the power transmission unit are not limited to the conical shape, but may be manufactured to have a cylindrical shape as shown in FIG. 6. If the rotator is made in a cylindrical shape, the power transmission unit is operated as a kind of spur gear. That is to say, as shown in FIG. 6, so as to transmit power to first and second shafts S5 and S6, which are positioned in parallel, the power transmission unit includes a first rotator 5 fixed to the first shaft S5 and having linear N and S poles 7 and 8 alternatively formed on a^' first cylindrical surface 51 thereof, and a second rotator 6 fixed to the second shaft S6 and having linear S and N poles 8 and 7 alternately formed on a second cylindrical surface 61 thereof opposite to those on the first cylindrical surface 51. The first and second cylindrical surfaces 51 and 61 are disposed at a certain gap so that a magnetic field adherence space is successively formed between them when power is transmitted. At this time, N and S poles are alternately formed on the cylindrical surface of each cylindrical rotator at regular intervals in a longitudinal direction parallel to the shaft, and the cylindrical surfaces 51 and 61 of the first and second rotators have different polarities on their opposite surfaces with a mutually spaced gap therebetween. For example, if the polarities are arranged on the cylindrical surface 51 of the first rotator, fixed to the first shaft, in the order of N, S, N and S, polar arrangement on the corresponding cylindrical surface 61 of the second rotator is in the order of S, N, S and N. Thus, by means of such configuration, different poles are arranged on the opposite cylindrical surfaces of the power transmission unit of the present invention, so the first and second rotators transmit the driving power, without being in contact with one another, by means of attractive force generated between the first and second cylindrical surfaces. Namely, magnetization generated by different poles allows power to be transmitted through a gap without engagement of the first and second rotators. That is to say, according to the peculiar aspect of the present invention, the first and second rotators rotate in a non-contact state while spaced apart from each other by means of magnetization since the N and S poles are alternately arranged on the cylindrical surfaces. At this time, since a linear magnetic field space is formed through the N and S poles on the facing cylindrical surfaces, a magnetically facing area where the opposite magnetic poles on the cylindrical surfaces encounter one another is greater than that of the conventional permanent magnet assembly of a helical type, thereby maximizing the power transmission between the first and second shafts. In addition, since the first and second rotators are spaced apart from each other and transmit power in a non- contact state by means of attractive force of the magnetic poles formed on each cylindrical surface, lubricant conventionally used for minimizing frictional force between gears is not required and it may be effective in a work place that requires a high level of cleanliness, for example, a semiconductor production line. Meanwhile, each pole 7 and 8 arranged on the first and second cylindrical surfaces 51 and 61, positioned parallel with adjacent polarities being opposed, is formed using a magnet body. For example, as shown in FIGs. 7 and 8, each of the poles 7 and 8 alternately arranged on each cylindrical surface is formed using a long magnetic body with a single polarity. At this time, grooves 52 and 62 are formed at regular intervals on the first and second cylindrical surfaces 51 and 61, such that magnetic bodies 71 and 81 are inserted and attached to the grooves 52 and 62 by means of adhesive. That is to say, in this embodiment of the present invention, each rotator 5 or 6 is made of non-magnetic material, and each pole 7 and 8 formed on the cylindrical surface of this rotator is formed using a plurality of magnetic bodies 71 and 81, each having single polarity such as N or S . If the rotator is made using the magnetic bodies having single polarity differently, it is possible to easily manufacture the rotator by means of simple processing without any special tool for producing a permanent magnet. In addition, since the rotator may be made in various sizes, as required, it is possible to make the rotator in a large size to transmit more power. However, the first and second rotators 5 and 6 may be configured using magnetic material, not the non-magnetic material mentioned above. Namely, the rotator itself may be a permanent magnet, with different polarities on the cylindrical surface, by using a separate device. In the case that the rotator is made using the permanent magnet as mentioned above, the rotator may be made integrally using the magnetizing device shown in FIG. 9. FIG. 9 is a perspective bottom view illustrating a rotator magnetizing device of a power transmission unit according to yet another embodiment of the present invention, and FIG. 10 is a sectional view showing that the rotator of FIG. 9 is inserted. The apparatus for manufacturing a power transmission unit according to the present invention magnetizes the first rotator 5 so that linear N and S poles are formed on the first and second cylindrical surfaces 51 and 61 mounted to the first and second shafts, installed at an angle, to transmit power. That is to say, as shown in FIG. 9, the apparatus for manufacturing rotator has a cylindrical hole 70 at the inner center of a bundle of iron core frames 10 so that the cylindrical surfaces 51 and 61 of the rotator 5 and 6 may be inserted therein in contact with its inner surface. A plurality of iron cores 40 are provided at regular intervals to the bundle of iron core frames 10 around the cylindrical hole 70 through a plurality of coil winding spaces 30. Coils 50 with different polarity of supply electricity are alternately wound in the coil winding spaces 30 adjacent to each iron core 40. According to such configuration, as shown in FIG. 10 the rotators 5 and 6 with strong magnetism are inserted into the cylindrical hole 70 formed at the inner center of the iron core frame bundle 10 in close contact with the inner surface thereof. In addition, if power is supplied to the coils 50 wound around each iron core 40 with different polarities, the cylindrical surface of the rotator is magnetized to have polarity corresponding to polarity of each coil. At this time, the magnets formed on the cylindrical surface 51 and 61 of the rotator are formed in a linear shape by means of the iron cores formed by the magnetizing device. Accordingly, the rotator of the power transmission unit of the present invention may be mass-produced by means of the magnetizing device, and particularly power may be more accurately transmitted since each polarity is arranged by means of magnetization. Meanwhile, FIG. 11 is a schematic view showing .a conveyor using the power transmission unit according to a preferred embodiment of the present invention. As shown in the drawing, the conveyor using the power transmission unit according to a preferred embodiment of the present invention is configured so that a plurality of first rotators 1 in which the fan-shaped N and S poles 3 and 4 are alternately formed on the first conical surface 11 are mounted to one long driving shaft 100. In addition, at each end of a plurality of driven shafts 300 arranged and rotated orthogonal to the driving shaft 100 to configure a conveyor carrying unit 200, the fan-shaped S and N poles 4 and 3 are alternately formed on the second conical surface 21 opposite to those on the first conical surface 11 and 21. In addition, the second rotators 2 are provided to successively form magnetic field adherence spaces during power transmission by arranging the first and second conical surfaces 11 and 21 with a gap therebetween. The conveyor carrying unit 200 includes a pair of frames 210 oppositely arranged in the longitudinal direction, a plurality of carrying rollers 220 extended orthogonal to the frame and having both ends rotatably installed to inner sides of the frames 210, and a driven shaft 300 in which the carrying rollers 220 are fixedly inserted to rotate it . According to such configuration, an object placed upon the rollers is carried lengthwise along the frame by means of the carrying rollers that are rotated according to rotation of the driven shaft. In this embodiment of the present invention, the driving shaft and the driven shaft 100 and 300 of the conveyor are orthogonal to each other, and the first and second conical surfaces 11 and 21 are inclined at 45 . According to such configuration, the power transmission unit according to the present invention transmits power between the shafts with the driving and driven shafts being orthogonal in a plane. At this time, each conical rotator fixed to the driving and driven shaft is also inclined at 45 , the conical rotators fixed to the driving and driven shafts are also arranged orthogonally. That is to say, the power transmission unit according to the present invention is arranged in a general bevel gear arrangement, such that it transmits the longitudinal driving force of the driving motor laterally. At this time, the fan-shaped N and S poles are alternately formed in the longitudinal direction parallel to the shaft on the conical surface, or the inclined surface, of each conical rotator, and each conical surface 11 and 21 of the first and second rotators has different polarities on the opposite surfaces with a gap therebetween. For example, if the polar arrangement on the conical surface 11 of the first rotator fixed to the first shaft is in the order of N, S, N and S, polar arrangement on the corresponding conical surface 21 of the second rotator is in the order of S, N, S and N. Thus, by means of such configuration, different poles are arranged on the opposite conical surfaces in the power transmission unit of the present invention, such that the first and second rotators transmit the driving power, without being in contact with one another, by means of attractive force generated between the first and second conical surfaces. Namely, magnetism generated by different poles allows power to be transmitted through a gap without engagement of the first and second rotators. That is to say, according to the peculiar aspect of the present invention, the first and second rotators rotate in a non-contact state while being spaced apart from each other by means of magnetization since the fan- shaped N and S poles are alternately arranged on the conical surfaces. At this time, since a linear magnetic field space is formed through the N and S poles on the opposite conical surfaces, or the inclined surfaces, a magnetically facing area, where the opposite magnetic poles on the conical surfaces encounter one another, is greater than that of the conventional permanent magnet assembly of a helical type, thereby maximizing the power transmission between the first and second shafts. In particular, since the first and second conical surfaces of the first and second rotators are operated orthogonally, a driving torque is changed in proportion to the size of the permanent magnet, or the size of the rotator, due to magnetic facing. In addition, since the first and second rotators are spaced apart from each other and transmit power in a non- contact type by means of attractive force of the magnetic poles formed on each conical surface, lubricant conventionally used for minimizing frictional force between gears is not required and it may be effective in a work place that requires a high level of cleanliness, for example, a semiconductor production line. Meanwhile, each pole arranged on the first and second conical surfaces, which are inclined, opposite orthogonal surfaces, is formed using a magnet body. For example, as shown in FIGs. 2 and 3, each of the poles alternately arranged on each conical surface is formed using a long magnetic body with a single polarity. At this time, grooves 12 and 22 are radially formed at regular intervals on the first and second conical surfaces 11 and 21, such that magnetic bodies 31 and 41 are inserted and attached to the grooves 12 and 22 by means of adhesive . That is to say, in the preferred embodiment of the present invention, each rotator 1 and 2 is made of non- magnetic material, and each pole 3 and 4 formed on the conical surface of this rotator is formed using a plurality of magnetic bodies 31 and 41, each having single polarity such as N or S . If the rotator is made using the magnetic bodies having single polarity differently, it is possible to easily manufacture the rotator by means of simple processing without any special tool for forming a permanent magnet. In addition, since the rotator may be made in various sizes, as required, it is possible to make the rotator in a large size to transmit more power. However, the first and second rotators 1 and 2 may be configured using magnetic material, not the non-magnetic material mentioned above. Namely, the rotator itself may be a permanent magnet with different polarities on the conical surface by using a separate device. In the case that the rotator is made using the permanent magnet as mentioned above, the rotator may be formed integrally using a magnetizing device shown in FIG. 4. FIG. 4 is a perspective bottom view illustrating a rotator magnetizing device of a power transmission unit according to yet another embodiment of the present invention, and FIG. 5 is a sectional view showing that the rotator of FIG. 4 is inserted. The apparatus for manufacturing a power transmission unit according to the present invention magnetizes the first and second rotators 1 and 2 so that fan-shaped N and S poles are formed on the first and second conical surfaces 11 and 21 mounted to the first and second shafts, installed at an angle, to transmit power. That is to say, as shown in FIG. 4, the apparatus for manufacturing rotator has a conical hole 20 at the inner center of a bundle of iron core frames 10 so that the conical surfaces 11 and 21 of the rotator 1 and 2 may be inserted therein in contact with its inner surface. A plurality of iron cores 40 are provided to the bundle of iron core frames 10 around the conical hole 20 through a plurality of coil winding spaces 30. Coils 50 with different polarity of supply electricity are alternately wound in the coil winding spaces 30 adjacent to each iron core 40. According to such configuration, as shown in FIG. 5, the, highly magnetic, rotators 1 and 2 magnetismare inserted into the conical hole 20 formed at the inner center of the iron core frame bundle 10 in close contact with its inner surface. In addition, if power is supplied to the coils 50 wound around each iron core 40 with different polarities, the conical surface that is an inclined surface of the rotator is magnetized to have polarity corresponding to the polarity of each coil. At this time, the magnets formed on the conical surface 11 and 21 of the rotator are formed in a fan shape by means of the iron cores formed by the magnetizing device. Accordingly, the rotator of the power transmission unit of the present invention may be mass-produced by means of the magnetizing device, and particularly power may be more accurately transmitted since each polarity of the rotator is arranged by means of magnetization. Thus, in the conveyor using the power transmission unit according to the present invention, if a driving motor 400 is operated, the driving shaft 100 connected to the driving motor 400 is rotated in a certain direction, and the first rotators 1 fixed to the driving shaft 100 at regular intervals are also rotated. At this time, the second rotators 2 of each driven shaft arranged orthogonal to the first rotates 1 with a gap therebetween are rotated. That is to say, since magnets with different polarities are arranged on the opposite surfaces of the conical surface 11 of the first rotator and the conical surface 21 of the second rotator, magnetism generated between the magnets gives a rotating force. Namely, the attractive force generated by different poles allows transmission of the driving force of the first rotator to the second rotator with a gap therebetween without engagement of the first and second rotators . In particular, since each magnet formed on each conical surface is formed in a linear type identical to the axial direction of each rotator, the magnetic facing area where opposite magnets of each conical surface encounter one another is increased to maximize power transmission between the driving shaft and the driven shaft . Meanwhile, the carrying roller 220 is rotated by means of the driven shaft 300 that receives power from the driving shaft 100 through the power transmission unit. Namely, the carrying rollers configuring the conveyor carrying unit are fixedly inserted to each driven conveyor to be capable of rotating. Accordingly, the conveyor carrying unit conveys an object placed upon the roller by the carrying force by means of rotation of each roller.

INDUSTRIAL APPLICABILITY As described above in detail, the power transmission unit and the conveyor using the unit according to the present invention may prevent the first and second rotators from idling by successively forming the magnetic field adherence spaces with wide adherence area to maximize power transmission while the first and second rotators transmit power. In particular, since the poles alternately formed on the conical surface of each rotator are formed in a longitudinal direction against the rotator, the opposite poles are rotated in a line contact, not in one point contact, such that the magnetic facing area where opposite poles of each conical surface encounter one another is increased to maximize the power transmission between the first and second shafts. In addition, since the first and second rotators are spaced apart from each other and transmit power in a non- contact state by means of mutual attractive force of the poles formed at each conical surface, lubricant conventionally used for minimizing a frictional force between gears is not required and dust is not generated, such that it may be effective in a work place that requires a high level of cleanliness, for example, a semiconductor production line. In addition, it is possible to easily manufacture the rotator by means of simple processing without any special tool for producing a permanent magnet, and the rotator may be made in various sizes, as required. In addition, the rotator may be easily manufactured using the apparatus for manufacturing a power transmission unit according to the present invention, and particularly power may be more accurately transmitted since each polarity is arranged by means of magnetization. The present invention has been described based on preferred embodiments with reference to the accompanying drawings, but it will be apparent to persons skilled in the art that various modifications may be made without departing from the scope of the invention. Thus, the scope of the invention should be interpreted on the basis of the appended claims that mention to include such many modifications .

Claims

WHAT IS CLAIMED IS:

1. A power transmission unit, mutually adhered through a linear magnetic field space, for transmitting power between first and second shafts angled to each other, the power transmission unit comprising: a first rotator fixed to the first shaft and having fan-shaped N and S poles alternately formed on a first conical surface; and a second rotator fixed to the second shaft and having fan-shaped S and N poles alternately formed on a second conical surface, the first and second conical surfaces being arranged with a gap therebetween so that a magnetic field adherence space is successively formed during power transmission.

2. A power transmission unit according to claim 1, wherein the first and second shafts are orthogonal to each other, and the first and second conical surfaces are inclined at 45.

3. A power transmission unit according to claim 1 or

2, wherein each pole formed on the first and second conical surfaces is formed by means of a magnetic body inserted and attached to grooves formed in a radial direction at regular intervals on the first and second conical surfaces .

4. A power transmission unit according to claim 1 or 2, wherein each pole formed on the first and second conical surfaces is formed by means of magnetization.

5. A power transmission unit, mutually adhered through a linear magnetic field space, for transmitting power between first and second shafts parallel to each other, the power transmission unit comprising: a first rotator fixed to the first shaft and having linear N and S poles alternately formed on a first cylindrical surface; and a second rotator fixed to the second shaft and having linear S and N poles alternately formed on a second cylindrical surface, the first and second cylindrical surfaces being arranged with a gap therebetween so that a magnetic field adherence space is successively formed during power transmission.

6. A power transmission unit according to claim 5, wherein each pole formed on the first and second cylindrical surfaces is formed by means of a magnetic body inserted and attached to grooves formed in a radial direction at regular intervals on the first and second cylindrical surfaces.

7. A power transmission unit according to claim 5 or 6, wherein each pole formed on the first and second cylindrical surfaces is formed by means of magnetization.

8. An apparatus for manufacturing a power transmission unit mutually adhered through a linear magnetic field space, which magnetizes first and second rotators so that fan-shaped N and S poles are formed on first and second conical surfaces mounted to first and second shafts angled to each other to transmit power, wherein a conical hole is formed at an inner center of an iron core frame bundle so that the conical surfaces of the rotators are inserted in contact with an inner surface of the conical hole, a plurality of iron cores are provided to the iron core frame bundle around the conical hole in a radial direction through a plurality of coil winding spaces, and coils with different polarities of supply electricity are alternately wound in the coil winding space adjacent to each iron core.

9. An apparatus for manufacturing a power transmission unit mutually adhered through a linear magnetic field space, which magnetizes first and second rotators so that linear N and S poles are formed on first and second cylindrical surfaces mounted to first and second shafts parallel to each other to transmit power, wherein a cylindrical hole is formed at an inner center of an iron core frame bundle so that the cylindrical surfaces of the rotators are inserted in contact with an inner surface of the cylindrical hole, a plurality of iron cores are provided to the iron core frame bundle around the cylindrical hole in a radial direction through a plurality of coil winding spaces, and coils with different polarities of supply electricity are alternately wound in the coil winding space adjacent to each iron core .

10. A conveyor using a power transmission unit mutually adhered through a linear magnetic field space, the conveyor comprising: a plurality of first rotators mounted to one long driving shaft, each having fan-shaped N and S poles alternately formed on a first conical surface thereof; and a plurality of second rotators mounted to each end of a plurality of driven shafts arranged and rotated orthogonal to the driving shaft and configuring a conveyor carrying unit, each of the second rotators having fan- shaped S and N poles alternately formed on a second conical surface oppositely to those on the first conical surface, the first and second conical surfaces being arranged with a gap therebetween to successively form magnetic field adherence spaces during power transmission.

11. A conveyor according to claim 10, wherein the driving and driven shafts are orthogonal to each other, and the first and second conical surfaces are inclined at 45.

12. A power transmission unit according to claim 10 or 11, wherein each pole formed on the first and second conical surfaces is formed by means of a magnetic body inserted and attached to grooves formed in a radial direction at regular intervals on the first and second conical surfaces .

13. A power transmission unit according to claim 10 or 11, wherein each pole formed on the first and second conical surfaces is formed by means of magnetization.