JPH03107658A - Magnetic gear - Google Patents

Abstract

PURPOSE:To provide a gear easy to manufacture having a simple structure and strong and stable torque transmission by coaxially disposing plural pairs of magnetic gears with the magnetic engagement position of a pair of the magnetic gears being successively shifted. CONSTITUTION:A driving side gear 10 has six tooth surfaces 11 and six magnetic poles disposed, and a driven side gear 14 having eight tooth surfaces 15 has eight magnetic poles disposed, whereby the reduction gear ratio is set 1:1.3. A pair of magnetic gear 1 formed of the driving side gear 10 and the driven side gear 14 and a magnetic gear 2 having quite the same constitution are coaxially disposed with the magnetic engagement position being shifted by 1/2 pitch. In the magnetic engagement between the gears 10 and 14, as permanent magnets 12, 16 are disposed with the same poles upside, the same poles oppose and magnetically repel each other, and the gear 14 is rotated in the opposite direction by the rotation of the gear 10 and torque transmitted. In this case, each magnetic gear 2 having the same constitution coaxially disposed on the driving side shaft 13 and the driven side shaft 17 of the gear 1 makes the same action. Therefore, the cavity between magnets is not changed in spite of load fluctuation, and torque transmission is highly stabilized.

Description

[Detailed description of the invention] Industrial field of application This invention is characterized by being noiseless and dustless, and transmits torque by magnetic attraction or repulsion of magnets attached to the tooth surfaces of each gear on the driving side and the driven side. This invention relates to improvements in magnetic gears, in which a plurality of pairs of magnetic gears are coaxially arranged by sequentially shifting the meshing positions of the pairs of magnetic gears, thereby enabling stable torque transmission during load fluctuations.

Background Art Magnetic gears are non-contact gears, so they have the characteristics of no noise, no need for lubrication, and no generation of dust.
In clean rooms and vacuum equipment, blowers, carriers,
It can be used in rotating equipment, power transmission devices such as valves, etc.

As shown in Fig. 5, the simplest magnetic gear consists of two rings (60) with multiple magnetic poles arranged on the outer circumferential surface of the multi-magnet (60).
A configuration was proposed in which the outer magnetic pole surfaces of 61
No. 50378). However, the magnetic gear having the above configuration has a problem in that torque transmission is weak and synchronization is likely to occur.

In addition, as shown in Fig. 4, a plurality of different magnetic poles (5
A pair of involute gears (50
A configuration has been proposed (Japanese Utility Model Publication No. 165844/1983) in which torque is transmitted by magnetically attracting or repelling the tooth surfaces of X51) so that they face each other so as to mesh with each other at a required interval. However, the magnetic gears configured as described above have problems such as weak torque transmission, the gap changing when they mesh and causing pulsation, and the teeth coming into direct contact during overload.

As shown in Figure 3, a large number of magnets (42X
Large and small disks (40x41) with 43) arranged around the disk surface.
Place the magnets (
42 x 43) facing each other with an air gap, a configuration is proposed in which torque is transmitted through magnetic attraction (Journal of the Japanese Society of Applied Magnetics Vol. 1.1)
3. No. 2.1989423-426).

The magnetic gear with the above configuration has a large number of magnets (4
2) Since (43) is arranged on the disk surface, it is not only difficult to manufacture, but also difficult to set, making it impractical.

Purpose of the Invention The present invention provides a magnetic gear consisting of spur gears and other gears of various shapes, which has a simple structure and is easy to manufacture, has strong and stable torque transmission, and has a structure that reduces the gap between the magnets attached to the tooth surface. The object of the present invention is to provide a magnetic gear having a structure that has little change and whose teeth do not come into contact with each other during overload.

Summary of the Invention This invention is a magnetic gear that transmits torque by magnetic attraction or repulsion of magnets attached to the tooth surfaces of each of the gears on the driving side and the driven side. This magnetic gear is characterized by having a plurality of pairs of magnetic gears arranged coaxially.

Structure of the Invention In this invention, magnetic gears are a pair of gears in which magnets are attached to the tooth surfaces of the so-called gears of a mechanical element. Alternatively, it refers to a configuration in which torque is transmitted from the driving side to the driven side at a predetermined ratio of the number of teeth by repulsion, that is, by magnetic engagement.

As shown in Fig. 1, this invention is based on the fact that two pairs of magnetic gears are coaxially arranged with their magnetic meshing positions shifted by 1/2 tooth pitch of the gears, and the overlapping configuration allows for load fluctuations. Regardless of the magnetic engagement, the gap between the magnets remains unchanged, resulting in a stable magnetic gear with strong torque transmission.

In addition to the spur gear configuration shown in FIG. 1, the magnetic gear of the present invention may also include multiple pairs of magnetic gears arranged coaxially, or multiple pairs of tooth surfaces on one gear, and the magnetic meshing positions are sequentially shifted. The tooth surfaces and magnets of the gears may be provided at an angle with respect to the rotation axis, and the adjacent tooth surfaces and magnets may be connected to form brown ridged gears, helical gears, helical gears, threaded gears (helical gears, etc.). A double-edge Calgia or closed-edge Calgia configuration may also be used.

In this invention, a ferrite magnet, an alnico magnet, or a rare earth cobalt magnet can be used as the magnet attached to the tooth surface of the magnetic gear, but in particular, a light rare earth such as Nd or P is used as R, and B, Fe, etc. By using a Fe-B-R based sintered magnet, which has extremely high energy product of 30 MGOe or more as its main component, it is possible to achieve extremely high torque transmission and to achieve miniaturization.

In particular, when the magnet is used in a curved manner, it is also possible to select a magnet that is easy to mold, such as a resin magnet. Furthermore, it is desirable to arrange magnetic pole pieces on the opposing surfaces of these magnets as necessary.

Based on the Drawings (Disclosure of the Invention) Figures 1a and 1b are a front view and a side view of a magnetic gear according to the present invention. FIG. 2 is a perspective explanatory view showing another configuration of the magnetic gear according to the present invention.

Configuration 1 The magnetic gear (IX2) shown in FIG.
4x24) is a spur gear shape, and the fins protruding radially on the outer circumferential surface of a disc made of non-magnetic material are tooth surfaces (11x15x25).
A permanent magnet (
12 x 16 x 26) to form the required magnetic pole surface.

That is, as shown in FIG. 1a, the driving gear (10) has six tooth surfaces (11) and six magnetic poles, and the driven gear (14) has eight tooth surfaces (15). Drive side gear (10) with 8 magnetic poles arranged on the surface and a reduction ratio of 1:1.3
and a driven side gear (14), a pair of magnetic gears (1),
A magnetic gear (2) having exactly the same configuration is arranged coaxially with the magnetic meshing position shifted by gear σ1/2 tooth pitch.

Effect Magnetic meshing between the driving side gear (work 0) and the driven side gear (14) in the magnetic gear (1) is caused by each permanent magnet (12).
Since the X16) is mounted with the same magnetic pole facing up, the magnetic poles face each other and cause magnetic repulsion, and the rotation of the driving gear (10) causes the driven gear (14) to rotate in the opposite direction and transmit torque. be done.

At this time, magnetic gears (2) of the same configuration coaxially disposed on the driving side shaft (13) and the driven side shaft (17) of the magnetic gear (1) are located at the magnetic meshing position of the magnetic gear (1). J
They have exactly the same effect with only a 1/2 tooth pitch difference.

By arranging two pairs of magnetic gears (IO2) that have exactly the same effect on the same axis, the magnetic meshing positions are shifted by 1/2 tooth pitch of the gears, so the magnetic meshing can be maintained regardless of load fluctuations. The air gap between magnets remains unchanged.
A magnetic gear with strong torque transmission and stability.

Configuration 2 The magnetic gear shown in FIG. 2 is the magnetic gear (IO
Magnetic gears with the same configuration as in 2) are arranged coaxially with their magnetic meshing positions shifted by 1/3 tooth pitch of the gears, and the two pairs of magnetic gears (IO2) in Fig. 1 are arranged coaxially. It has exactly the same effect as the structure.

To be more specific, three driving side gears (30 x 32 x 34) with permanent magnets (38) attached are arranged coaxially with the driving side shaft (36), and similarly three driven side gears are arranged on the driven side shaft (37). Gears (31) (33x35) are arranged coaxially, and the magnetic meshing positions of each pair of magnetic gears are shifted by I/3 tooth pitch of the gears.

Furthermore, when installing the permanent magnets, the permanent magnets of the three pairs of magnetic gears can be arranged in a helical shape by using inclined members having a required angle.

Example In the configuration in which two pairs of magnetic gears are coaxially arranged as shown in FIG.
When we measured the torque fluctuation between the driving gear and the driven gear with the reduction ratio set to 1:1.3 using an e-BR magnet, we found that a maximum torque of 2000 gr-(2) was obtained. , and there is little change in the gap between the magnets at the magnetic engagement position.
It was a magnetic gear with strong and stable torque transmission.

On the other hand, if only one pair of magnetic gears is used, the maximum weight is 740g.
Only a torque of r-- can be obtained, and the gap between the magnets at the magnetic meshing position changes greatly, causing the tooth surface of one gear without a permanent magnet to come into contact with the other permanent magnet, causing magnetic attraction. Sometimes it would stop rotating.

[Brief explanation of drawings]

FIGS. 1a and 1b are a front view and a side view of a magnetic gear according to the present invention. FIG. 2 is a perspective explanatory view showing another configuration of the magnetic gear according to the present invention. FIGS. 3a and 3b are a front view of a conventional magnetic gear and a side view of its magnetic gear disc. FIG. 4 is a perspective explanatory view showing a conventional magnetic gear. FIG. 5 is an explanatory front view showing a conventional magnetic gear.

Claims (1)

[Claims] 1. In a magnetic gear that transmits torque by magnetic attraction or repulsion of magnets attached to the tooth surfaces of each gear on the driving side and the driven side, the magnetic meshing positions of a pair of magnetic gears are sequentially shifted. A magnetic gear characterized by having multiple pairs of magnetic gears arranged coaxially.