JP2003139213A - Magnetic screw transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary motion transmitting device of touchless type having a large transmitting ability transmitting the rotating angle accurately with a small play. SOLUTION: The magnetic screw transmission device is configured so that a gap C is provided between a magnetic screw 2 magnetized spirally and a magnetic disc-A 4 and a magnetic disc-B 5 and the rotary motion is transmitted touchlessly. According to this arrangement, a plurality of magnet segments 3 is installed and an accurate transmission of the rotary motion with a small play is made touchlessly, and the operation can be performed with less wear and noise emission even in an environment requiring the pureness such as a clean room.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary motion transmitting device for transmitting a rotary motion in a power transmitting device in a non-contact manner with less wear, noise and power loss.

[0002]

2. Description of the Related Art As a conventional technique, there is a magnetic screw transmission device (Japanese Patent Laid-Open No. 8-336274) by the applicant of the present invention.

[0003]

However, in the magnetic screw transmission device in the prior art, the magnetic flux is low because the magnetic leads are laminated to manufacture the magnetic screw, and therefore the transmission capability is small. The present invention has been made to solve the above problems, and an object of the present invention is to provide a magnetic screw transmission device that improves the performance of the magnetic screw, has a large transmission capability, and can be used as a practical device. It is what

[0004]

SUMMARY OF THE INVENTION A magnetic screw transmission device according to the present invention has a magnetic screw and a magnet segment which are opposed to each other with a gap therebetween so that several magnetic flux circuits are formed on opposite lines. Configured the number of leads for the magnetic screw.
Moreover, the magnetic screw improved the magnetic flux density by spiral magnetization. Two magnetic disks are attached to reduce the load on the bearing and increase the transmission capacity. Further, the screw shaft is extended, and a plurality of subassemblies of the magnetic disc and the disc shaft are installed and operated to form a conveying device.

[0005]

According to the present invention, since the magnetic screw and the magnetic disk do not come into contact with each other and the rotational force is transmitted by the magnetic force, abrasion, noise,
A transmission device with less power loss can be realized. By forming a number of magnetic screw leads and several magnetic flux circuits of magnetic segments, it is possible to perform transmission with increased accuracy of the rotation angle. Since the magnetic screw ring is manufactured by spiral magnetization, the number of steps is reduced and a high magnetic flux density can be obtained. If you attach two magnetic disks,
Not only is the transmission capacity doubled, but the magnetic force that pulls the magnetic disk toward the magnetic screw is canceled by the hub, and does not become a load on the bearing. If you extend the screw shaft to make it multi-axis,
The rotary motion of one prime mover can be distributed and supplied to a plurality of shafts.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic screw transmission device according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a magnetic screw transmission device according to the present invention, in which (a) is a front view,
(B) is a sectional view as seen from the arrow P. In these figures, 2 is a magnetic screw having a spiral magnetic lead 1 on a cylindrical surface, 10 is a screw shaft which is the center of rotation of the magnetic screw, 4
Reference numerals 5 and 5 denote a magnetic disk A and a magnetic disk B on which a plurality of magnetic segments 3 are arranged on the circumference. Reference numeral 6 denotes a hub to which the magnetic disk is attached. Reference numeral 7 denotes a disk shaft serving as a center of rotation of the hub.
When the magnetic screw 2 rotates, the magnetic pole advances on the line facing the magnetic discs 4 and 5, and the magnetic pole having the opposite polarity of the magnet segment is attracted by the magnetic force. When the poles of the magnetic leads and the poles of the magnetic segments that are paired with each other move in synchronization, the rotational movement of the screw shaft 2 is transmitted to the magnetic discs 4 and 5, and the disc shaft 7 rotates. As shown in FIG. 2, the rotational movement can be transmitted even if one of the magnetic discs 3 or 4 is removed. Transmission capacity, rotation angle accuracy, and bearing life are halved, but this can be implemented when reducing the manufacturing costs of lightweight conveyors. By extending the screw shaft to make it multi-axial, a single prime mover can transmit rotational motion to multiple shafts. This rotation transmission is reversible, and the disc shaft 7 can be used as the drive shaft. FIG. 3 is a sketch showing a magnetic screw spirally magnetized. A MA magnet mainly made of manganese / aluminum has a surface magnetic flux density of 145 mT, and a neodymium magnet has a magnetic flux density of 319 mT, and a single-thread screw and a multi-thread screw can be manufactured. FIG. 4 is an explanatory view of a portion where the magnetic screw and the magnetic disk are opposed to each other. For convenience, a plan view of the magnetic disk is superposed on the developed view of the outer peripheral surface of the magnet screw. The d dimension is determined by finding the position where the magnetic force is balanced by the substance. The e dimension is a half of the pitch, and the two magnetic discs are attached with the phase shifted by the e dimension. Although a single-thread screw has been described in this figure, a multi-thread screw can also be manufactured. With these configurations, relatively accurate rotation transmission can be performed in a non-contact manner, and a magnetic screw transmission device having a greater transmission capability can be realized.

[0007]

According to the magnetic screw transmission device of the present invention, since the rotational movement can be performed in a non-contact manner due to the magnetic force, wear,
A transmission device with less noise and power loss can be obtained. It is a highly efficient device as a speed reducer compared to a worm speed reducer using mechanical contact, and can be applied to mechanical devices used in a clean room by taking advantage of the characteristic that no dust is generated. The magnetic forces that attract the two magnetic discs to the magnetic screw are canceled by the hub, so that the load on the bearing is reduced and a long-life transmission device is realized. If the screw shaft is extended to be multi-axial, the rotary motion of one prime mover can be distributed and transmitted to a large number of shafts, and the range of use can be expanded to vehicles and conveyors.

[Brief description of drawings]

1A and 1B are views showing an embodiment of a magnetic screw transmission device according to the present invention, FIG. 1A is a front view excluding a front side support body, and FIG. 1B is a side view seen from P;

2A and 2B are views showing an embodiment of the magnetic screw transmission device according to claim 2 of the present invention, wherein FIG. 2A is a front view and FIG. 2B is a side view.

FIG. 3 is an explanatory diagram of a magnetic screw according to the present invention.

FIG. 4 is an explanatory diagram of a main part of a facing portion of a magnetic screw and a magnetic disk according to the present invention.

FIG. 5 is a plan view showing an embodiment of claim 3 according to the present invention.

FIG. 6 is an explanatory diagram of a configuration of a magnetic screw in a conventional example,
(A) is an N-pole magnet ring, and (b) is an S-pole magnet ring.

[Explanation of symbols]

1 ... Magnetic lead 21 ... Motor 2 ... Magnetic screw 22 ... Coupling 3 ... Magnetic segment 23 ... Drive shaft 4 ... Magnetic disk A 24 ... Magnetic screw 5・ ・ ・ Magnetic disk B 25 ・ ・ ・ Magnetic disk 6 ・ ・ ・ Hub 26 ・ ・ ・ Drive shaft 7 ・ ・ ・ Disk shaft 27 ・ ・ ・ Conveying roller 8 ・ ・ ・ Bearing 28 ・ ・ ・ Bearing 9 ・..Support 29 ... Unit frame 10 ... Screw shaft 31 ... N pole magnet ring 32 ... S pole magnet ring

Claims (3)

[Claims] 1. The present invention relates to a magnetic screw (2) having a spiral magnetic lead (1) magnetized on a cylindrical surface, a screw shaft (10) penetrating its center, and a magnetic disc A (4). ), A magnetic disk B (5) and a disk axis (7) that is orthogonal to the screw axis (1) at the center of rotation, and the magnetic screw and the magnetic disk are set to face each other by setting a gap (c). A magnetic screw transmission device, which transmits rotational motion in a non-contacting manner by means of. 2. The magnetic disk according to claim 1, wherein the magnetic disk A (3) or the magnetic disk B (4) sandwiching the magnetic screw is removed, and the rotary motion is transmitted by one magnetic disk. Screw transmission device. 3. The magnetic device according to claim 1, wherein the screw shaft is extended, and a plurality of subassemblies each including a magnetic disc and a disc shaft are installed to enable use of the plurality of shafts. Screw transmission device.