JPH0673501U - Toothed wheel - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a gear capable of suppressing the use of a lubricant and preventing generation of dust and noise due to operation. [Structure] The gears 1 and 2 are magnetized so that the meshing teeth 1a and 2a exert a repulsive force on each other, and the above effect is obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gear, and more particularly to a gear that prevents friction and dust generation and suppresses noise generation.

[0002]

[Prior art]

 Conventionally, transmission of power and the like by gears is performed by frictionally engaging the teeth of the gears with each other on the pitch circle diameter.

[0003]

[Problems to be solved by the device]

 Therefore, it is indispensable to supplement the lubricant in order to prevent the friction of the teeth, and there is a drawback that dust and noise generated by abrasion cannot be avoided.

Therefore, the present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a gear that can suppress the use of a lubricant and can prevent the generation of dust and noise due to its operation.

[0005]

[Means for Solving the Problems]

 The gear according to the present invention is magnetized so that the meshing teeth exert a repulsive force on each other.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 show gears 1 and 2 as a first embodiment of the present invention. The small-diameter gear 1 is, for example, the driving side, and the large-diameter gear 2 is the driven side.

As shown in FIGS. 1 and 2, in the gears 1 and 2, the teeth 1a and 2a of each gear 1 and 2 are attached such that one side in the tooth thickness direction is an N pole and the other side is an S pole. It is magnetized. As is apparent from FIG. 2, the two gears 1 and 2 have the same magnetic poles facing each other when the teeth are meshed.

In such a configuration, the meshing teeth 1a, 2a exert a repulsive force by magnetism, and power (torque) is transmitted in a non-contact state. Therefore, no lubricant is required to lubricate the teeth, and no dust or noise is generated due to tooth wear, preventing dust generation in clean rooms and high vacuum. It is suitable for use as a part of a device or the like that should operate under the conditions that should be met.

In FIG. 2, reference numeral 5 indicates the magnetic flux generated between the N and S poles of one tooth 1a, 2a.

Further, regarding each of the gears 1 and 2 described above, it is preferable that only the teeth 1a and 2a are magnetized, and the portions inside the root circle diameter are not magnetized.

Next, a gear as a second embodiment of the present invention will be described with reference to FIG. The gear according to the second embodiment has the same structure as the gear according to the first embodiment shown in FIGS. 1 and 2 except for the points described below. Therefore, the description of the gear as a whole is omitted. I will only explain the parts. Further, in the following description, the same reference numerals are used for the same components as those of the gear according to the first embodiment. The same applies to the third embodiment described later.

As shown in FIG. 3, in the gears 1 and 2, the teeth 1a and 2a of the gears are magnetized so that one side in the tooth width direction has an N pole and the other side has an S pole. In addition, the same magnetic poles face each other when the teeth 1a, 2a are meshed.

With such a magnetized configuration, a magnetic repulsive force is generated between the meshing gears, and the same effect as the gear shown in the first embodiment can be obtained.

In the gear according to the second embodiment, only the tooth portion is magnetized like the gear according to the first embodiment, and the entire gear has different magnetic poles on both sides in the width direction. The magnet may be magnetized so as to have magnetism. In this case, the magnetization can be performed very easily.

Next, a gear as a third embodiment of the present invention will be described.

As shown in FIG. 4, in the gears 1 and 2, an N pole and an S pole are arranged and magnetized in the radial direction of each gear, that is, in the tooth-take direction.

Specifically, the boundaries 1c and 2c are set somewhat inward of the diameters of the root circles of both gears 1 and 2, and the outside is an N pole and the inside is an S pole. As described above, the same magnetic poles face each other when the teeth are meshed. With this configuration, as in the above-described embodiments, the meshing teeth transmit the power in a non-contact state by the magnetic repulsion force. Regarding the distance e between the boundaries 1c and 2c and the diameter of the root circle, the tip portions of the teeth 1a and 2a magnetized to the N pole and the S pole on the inner diameter side of the boundaries 1c and 2c are magnetized. It is necessary to set it so that the magnetic force generated between it and the open part is negligible.

Here, of the above-described three examples, the composition of magnetization described as the second example was applied to an actual gear manufactured as a test piece, and a result of an experiment of power transmission was performed. About.

The gears used in this experiment were a pair of large and small similarly to the above-mentioned embodiments, carbon steel was selected as the material of each, and the module m was set to 3. The tooth widths of both gears were both set to 15 mm, and both teeth were completely meshed.

The two gears are magnetized with 4000 gauss (G), and the torque that can be transmitted while the two gears are kept in a non-contact state with the small diameter gear on the driving side and the large diameter gear on the driven side is measured. It was

In each of the above-described embodiments, the case where the gears 1 and 2 transmit power while maintaining a completely non-contact state has been described. However, when the power to be transmitted is large or the use of a lubricant is used. In addition, under conditions where dust generation and noise generation are allowed to some extent, in addition to repulsive force due to magnetic force, power transmission by direct contact between teeth may be performed. However, even in this case, dust generated by friction is attracted by the magnetic force of each gear and is prevented from scattering to the outside.

Although carbon steel has been given as an example of the material of the gear, alnico ferrite rare earth or the like can be used as another material capable of imparting strong magnetic properties as well as mechanical strength. In particular, the rare earths are useful as a material for the gear according to the present invention because the magnetic flux density can be extremely increased.

[0024]

[Effect of device]

 As explained above, in the gear according to the present invention, the power is transmitted in the non-contact or substantially non-contact state by the magnetic repulsion, so that the lubricant is almost unnecessary and dust and noise are generated. It is suitable as a gear that should be installed in a device that should be installed in a clean room or in a high vacuum where it does not disperse dust and the like.

[Brief description of drawings]

FIG. 1 is a perspective view of a gear pair as a first embodiment of the present invention.

FIG. 2 is a diffusion exploded perspective view of a main part of each gear shown in FIG.

FIG. 3 is a diffusion exploded perspective view of a main part of a gear pair as a second embodiment of the present invention.

FIG. 4 is a diffusion exploded perspective view of an essential part of a gear pair according to a third embodiment of the present invention.

[Explanation of symbols]

 1, 2 gears 1a, 2a teeth

Claims (5)

[Scope of utility model registration request] 1. A gear according to claim 1, wherein the meshing teeth are magnetized so as to exert a repulsive force on each other. 2. One side of the tooth in the tooth thickness direction is an N pole,
The gear according to claim 1, wherein the other side is magnetized so as to have a south pole. 3. One side of the tooth in the tooth width direction is an N pole,
The gear according to claim 1, wherein the other side is magnetized so as to have a south pole. 4. The north pole and the south pole in the toothbrush direction of the tooth.
The gear according to claim 1, wherein the poles are arranged and magnetized. 5. The gear according to claim 1, wherein the gears meshing with each other have the same magnetic poles facing each other when the teeth mesh with each other.