JPH08336274A - Magnetic screw transmission - Google Patents

Abstract

PURPOSE: To realize a noncontact rotary motion transmission having high transmission capacity which can transmit the rotary motion at accurate rotational angle while eliminating the play. CONSTITUTION: A gap C is provided between a magnetic screw 2 and magnetic discs 4, 5 in order to realize noncontact transmission of rotary motion. Since a plurality of magnet segments 3 can be arranged, accurate noncontact transmission of rotary motion is realized while eliminating the play. The inventive transmission can be employed in a noiseless abrasion-free environment requiring cleanliness, e.g. 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, as shown in FIG. 6, a magnet segment is installed in a bevel shape and is installed with a slight gap on an orthogonal axis to transmit a rotary motion in a non-contact manner. The device was known.

[0003]

However, in the conventional transmission device using a magnetic screw in which magnet segments are arranged in a bevel shape, one pair or two pairs of magnet segments facing each other form a strong magnetic flux circuit. Since the transmission capacity is small because it does not exist, the rotation angle cannot be accurately transmitted due to the occurrence of play, and therefore it cannot be used for those that require forward and reverse rotation. Also, if you improve the performance of the magnet,
Bearing life is short due to strong axial thrust force. Furthermore, since one shaft is cantilevered,
The rotation is not stable at high speed. The present invention has been made in order to solve the above-mentioned problems, and has a large transmission ability by accurately transmitting a rotation angle without play, and even if the performance of the magnet is improved, the axial load of the bearing is increased. Without doing
Moreover, it is an object of the present invention to provide a magnetic screw transmission device capable of stable transmission even at high speed rotation.

[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 set therebetween so that a large number of magnetic flux circuits are formed on opposing lines. Increased the number of screw leads.
The magnetic screw was formed by stacking rings. Two magnetic discs are attached to reduce the load on the bearing and increase the transmission capacity. Further, by extending the screw shaft, a plurality of subassemblies of the magnetic disc and the disc shaft are installed and operated.

[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 increasing the number of leads of the magnetic screw and the number of magnet segments, a smooth rotation angle can be transmitted without play. Since the magnetic screw is formed by stacking the rings, it can be easily magnetized by the existing equipment and a high magnetic flux density can be obtained. When two magnetic discs are attached, not only double transmission capability is obtained, but also the magnetic force pulling the magnetic disc toward the magnetic screw is canceled by the hub, and it does not become a load on the bearing. If the screw shaft is extended to be multi-axial, 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 magnetic discs a and b on which a plurality of magnet segments 3 are arranged on the circumference, 6 is a hub to which the magnetic discs are attached, and 7 is a disc shaft which is the 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 lead and the poles of the segment magnet 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. 3A and 3B are component diagrams, where FIG. 3A shows an N-pole magnet ring and FIG. 3B shows an S-pole magnet ring. The N-pole magnet ring and the S-pole magnet ring are magnetized in a radial anisotropy.
The N-pole magnet ring and the S-pole magnet ring are overlapped, and the cutting line is 1
One pitch magnetic leads are obtained by heat forming so as to shift the pitch, and these are laminated to manufacture a magnet screw. FIG.
Is an explanatory view of a portion where the magnetic screw and the magnetic disk face each other. For convenience sake, a plan view of the magnetic disk is overlaid on the developed view of the outer peripheral surface of the magnet screw. The d dimension was 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, accurate rotation transmission can be performed in a non-contact manner, and a magnetic screw transmission device having a large transmission ability 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 can be applied to machinery used in a clean room by taking advantage of its dust-free characteristics. The magnetic forces that attract the two magnetic disks to the magnetic screw are canceled by the hub, so that the bearing is not loaded 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]

FIG. 1 is a view showing an embodiment of a magnetic screw transmission device according to the present invention, (a) is a front view and (b) is a sectional view.

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

FIG. 3 is an explanatory diagram of a configuration of a magnetic screw according to the present invention,
(A) is an N-pole magnet ring, (b) is an S-pole magnet ring.

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 of the magnetic screw transmission device according to the present invention.

6A and 6B are views showing a transmission device using magnetism in a conventional example, FIG. 6A is a sketch of a magnetic bevel wheel sub-assembly, and FIG.
[Fig. 4] is a plan view of unit assembly.

[Explanation of symbols]

 1 ... Magnetic lead 2 ... Magnetic screw 3 ... Magnet segment 4 ... Magnetic disc B 5 ... Magnetic disc B 6 ... Hub 7 ... Disc shaft 8 ... Bearing 9 ... Support 10 ... Screw shaft 11 ... N pole magnet ring 12 ... S pole magnet ring 21 ... Motor 22 ... Coupling 23 ... Drive shaft 24 ... Magnetic screw 25 ... Magnetic disk 26 ... Drive shaft 27 ... Conveying roller 28 ... Bearing 29 ... Unit frame 31 ... Magnetic bevel wheel sub-assembly 32 ... Magnet segment 33. ..Magnetic bevel wheel 34 ... Magnetic bevel wheel 35 ... Drive shaft 36 ... Driven shaft 37 ... Bearing 38 ... Support

Claims (3)

[Claims] 1. The present invention provides a magnetic screw (2) comprising a plurality of spiral magnetic leads (1) stacked on a cylindrical surface.
And a screw shaft (10) penetrating its center, a magnetic disk (4), a magnetic disk (5) and a disk shaft (7) orthogonal to the screw shaft (1) at its rotation center. A magnetic screw transmission device, characterized in that a gap (c) is set between a magnetic screw and a magnetic disc so that they face each other, and a rotational movement is transmitted in a non-contact manner by magnetic force. 2. The magnetic device according to claim 1, wherein the magnetic disk (3) or the magnetic disk (4) sandwiching the magnetic screw is removed, and the rotary motion is transmitted by one magnetic disk. Screw transmission device. 3. The screw shaft according to claim 1, wherein the screw shaft is extended, a plurality of sub-assemblies including a magnetic disk and a disk shaft are installed, and the plurality of shafts can be used. Magnetic screw transmission device.