JP2005337333A - Gear with torque limiter mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute a torque limiter mechanism with a simple and inexpensive structure, and absorb a fitting dimensional tolerance of a portion for transmitting torque such that a torque transmission function stably acts. <P>SOLUTION: In this gear with the torque limiter mechanism, an O-ring 40 comprising an annularly formed elastic material which performs torque transmission by frictional force is interposed between two gear members which are divided on inner and outer peripheries. Due to the O-ring 40, when torque transmitted at the time of torque transmission from one of the inner peripheral side gear member 20 and the outer peripheral side gear member 30 to the other exceeds a predetermined value, a slip is generated and torque transmission is performed until the predetermined value torque is achieved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a gear with a torque limiter mechanism. More specifically, the present invention relates to a gear with a torque limiter mechanism that absorbs torque equal to or greater than a predetermined value and transmits torque up to a predetermined value torque when the transmitted torque exceeds a predetermined value in a gear mechanism as a torque transmission mechanism.

2. Description of the Related Art Conventionally, for example, some devices such as a projector and a digital camera employ a slide mechanism using a drive source such as an electric motor in order to automatically open and close the lens cover (slide part). Specifically, in this type of slide mechanism, the torque supplied from the drive source is transmitted to the slide part by the gear mechanism, so that the opening / closing drive force is supplied.
Further, as disclosed in Patent Document 1 described later, there is a type in which a gear mechanism as a torque transmission mechanism is incorporated in a loading device of a compact disc player. In this disclosure, a gear that meshes with the drive side gear of the gear mechanism and a gear that meshes with the driven gear are in a penetrating state in the shaft portion, and a predetermined value or more is between the two gears and the shaft portion. A structure that causes slippage (relative rotation) when torque acts, that is, a torque limiter mechanism is formed. Thereby, for example, even when an overload (torque greater than a predetermined value) occurs in the driven gear, the overload can be absorbed by the torque limiter mechanism. Therefore, for example, even when an unexpected overload occurs during use, this overload is not transmitted to other parts of the gear mechanism, so that damage such as breakage can be prevented. . Here, a specific configuration of the torque limiter mechanism will be described. A metal shaft portion is press-fitted into a resin gear, and the limit value of the slip torque is set by this fitting. ing. Further, the limit value of the slip torque can be adjusted also by changing the surface roughness of the contact surface between the gear and the shaft portion.
In addition, for example, the presence or absence of an obstacle in the opening / closing path of the slide part described above is detected by a position sensor, or contact with the obstacle is detected mechanically and electrically, and the operation of the drive motor Some of them are designed to control. Also, such as a torque limiter mechanism used in paper feeders of copying machines and printers, when a torque exceeding a predetermined value is applied, the component is idled to cut off the connected state There is also.

JP 09-210174 A

However, in the above-described conventional technology, for example, when using a device such as a projector or a digital camera, care is taken so that a part such as a finger is not caught in a part that automatically opens and closes such as a lens cover (sliding part). I had to. In other words, an electric motor (drive source) used in this type of device generally generates only a relatively small torque, but even in that case, when a hand or a finger is caught, There will be some pain. Therefore, during use and maintenance, care must be taken not to bring the finger close to the lens part when the lens cover is opened and closed by another person's remote control operation or the like. Also, the gear mechanism itself may cause damage such as breakage due to such torque acting inside the mechanism.
In the technique disclosed above, for example, when an overload (torque greater than a predetermined value) occurs in the driven gear, the gear that is press-fitted into an interference-fitted state and the shaft portion slip with sliding friction. (Relative rotation) is generated. That is, since the frictional frictional force is applied to the contact portion by the direct contact between the gear and the shaft portion, it is necessary to design a fitting dimension with high precision for both of them. However, on the other hand, these gears and shafts may change their state of fit, surface roughness, etc. due to wear and temperature change due to repeated use. Will change. Moreover, this fitting dimensional error can be absorbed to some extent by making resin at least one side of the gear and the shaft portion. However, the resin applied to such a part must have a rigidity that can properly transmit the power transmitted from the gear cutting portion. Therefore, it has been difficult to provide a dimensional tolerance with a sufficient margin in the fitting between the gear and the shaft while maintaining a constant slip torque. Further, such a configuration is also unsuitable for long-term use.
In addition, what was comprised so that the above-mentioned torque limiter mechanism might be controlled electrically and mechanically becomes a structure complicated and expensive. Therefore, it is particularly difficult to use it by incorporating it in a small mechanism.

  The present invention has been devised as a solution to the above-described problems, and the problem to be solved by the present invention is to construct a torque limiter mechanism with a simple and inexpensive configuration and to transmit a torque transmission portion. It is to absorb the fitting dimensional tolerance and to make the torque transmission function work stably.

In order to solve the above problems, the gear with a torque limiter mechanism of the present invention takes the following means.
In the first aspect of the present invention, an annular friction transmission member made of an elastic material formed in an annular shape for transmitting torque by friction force is interposed between gear members divided into two on the inner and outer circumferences. When torque transmitted from one side of the inner peripheral side gear member and the outer peripheral side gear member to the other side by the transmission member is greater than or equal to a predetermined value, slipping occurs and torque transmission up to the predetermined value torque is performed. It is the structure which performs.
According to the first aspect of the invention, the inner peripheral gear member and the outer peripheral gear member are brought into a connected state by the elastic force of the annular frictional transmission member made of an elastic material interposed therebetween. . Therefore, torque is transmitted from one side to the other side between the inner peripheral side gear member and the outer peripheral side gear member by the action of the frictional force accompanying the elastic force of the annular frictional transmission member. Then, when the transmitted torque exceeds a predetermined value, that is, when the transmitted torque exceeds the action of the frictional force accompanying the elastic force of the annular frictional transmission member, it slips (relative rotation) to this connecting portion. Occurs. Therefore, torque corresponding to a predetermined value or more is absorbed by this slip. In addition, the sliding frictional force accompanying the elastic force of an annular frictional transmission member is given to the site | part which contacts and slides with an annular frictional transmission member with this slip. Therefore, torque transmission up to a predetermined value is performed by the action of the sliding frictional force.

Next, according to a second aspect of the present invention, in the first aspect described above, the annular frictional transmission member made of an elastic material is formed in an interference fit shape with respect to the outer peripheral surface shape of the inner peripheral side gear member. Is.
Here, it is well known that a member made of an elastic material (for example, a column shape) is deformed with buckling when a predetermined compressive stress is applied. Further, for example, when the annular frictional transmission member is assembled to the outer peripheral side gear member side, the annular frictional transmission member is formed into an interference fit shape with respect to the inner peripheral surface shape of the outer peripheral side gear member. It will be inserted while constricting. At this time, a compressive stress acts on the cross-sectional portion of the annular friction transmission member. In addition, a certain compressive stress is applied after the mounting. Accordingly, when the annular frictional transmission member is buckled by this compressive stress, the annular frictional transmission member is mounted in a surplus shape.
According to the second aspect of the invention, when the annular friction transmission member is assembled, the annular friction transmission member is attached to the outer peripheral surface shape of the inner peripheral side gear member while being stretched against elasticity. In other words, the annular frictional transmission member is mounted in close contact with the outer peripheral surface shape of the inner peripheral side gear member, since only the tensile stress acts on the cross-section portion and does not buckle when assembled. The

Next, according to a third aspect of the present invention, in the first or second aspect described above, at least the outer peripheral surface of the inner peripheral side gear member and the inner peripheral surface of the outer peripheral side gear member in which the annular frictional transmission member is interposed. A fitting shape into which the annular friction transmission member can be fitted is formed on the one side surface.
Here, the fitting shape in which the annular frictional transmission member can be fitted is a shape in which the mounting position can be determined when the annular frictional transmission member is fitted, and for example, positional displacement can be prevented. Examples include grooves and protrusions formed in the circumferential direction.
According to the third aspect of the invention, the positioning at the time of assembling the annular friction transmission member is performed by the fitting shape. Thereby, at the time of use, the annular frictional transmission member is prevented from coming off, and the elastic force acts constant.

Next, according to a fourth aspect of the present invention, in any one of the first to third aspects described above, the annular frictional transmission member is formed in an O-shaped cross section.
According to the fourth aspect of the invention, when the annular frictional transmission member is assembled, the annular frictional transmission member is attached so as to slide the curved surface having an O-shaped cross section.

Next, according to a fifth aspect of the present invention, in any one of the first to fourth aspects described above, the annular frictional transmission member is an O-ring.
According to the fifth aspect of the invention, the torque limiter function shown in the first to fourth aspects of the invention described above is exhibited by applying an O-ring that is a general-purpose component.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first aspect of the present invention, a stable torque can be obtained by a simple and inexpensive structure in which an annular friction transmission member made of an elastic material is interposed between an inner peripheral gear member and an outer peripheral gear member. The limiter function can be exhibited. That is, even if the fitting dimension between the inner peripheral side gear member and the outer peripheral side gear member changes due to, for example, repeated use or an external load such as a temperature change, the annular friction transmission member This dimensional error can be absorbed by elasticity. Therefore, the fitted state can be stabilized. In addition, since the influence of the external load is small as described above, it can be used with a long life and high reliability. Even at the time of designing, the fitting dimensional tolerance between the inner peripheral side gear member and the outer peripheral side gear member can be absorbed by this elasticity. Therefore, for example, by adjusting the shape and material of the annular frictional transmission member, the limit value of torque transmission can be easily adjusted. Moreover, since it is such a simple structure, it can also be easily used by incorporating in a small mechanism.
Furthermore, according to the second aspect of the present invention, the torque limiter function can be more stably exhibited. Further, the annular frictional transmission member can be easily assembled.
Furthermore, according to the third aspect of the present invention, the annular frictional transmission member can be more easily assembled, and the torque limiter function can be more stably exhibited.
Furthermore, according to the fourth aspect of the present invention, the annular frictional transmission member can be more easily assembled.
Furthermore, according to the fifth aspect of the present invention, a simple and inexpensive configuration using general-purpose parts can be achieved.

Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings.
FIGS. 1-6 shows one Example of the gear 10 with a torque limiter mechanism. 1 is a perspective view showing an appearance of a gear 10 with a torque limiter mechanism, FIG. 2 is a front view of an inner peripheral side gear member 20, FIG. 3 is a sectional view of the inner peripheral side gear member 20, and FIG. FIG. 5 is a sectional view of the gear member 30 as viewed from the side, and FIG. 6 is a sectional view of the gear 10 with a torque limiter mechanism as viewed from the side.
The gear 10 with a torque limiter mechanism of this embodiment is incorporated as a torque transmission mechanism for automatically opening and closing a lens cover of a projector used in a conference such as a presentation. More specifically, as shown in FIG. 1, the gear 10 with a torque limiter mechanism includes an inner peripheral gear member 20 and an outer peripheral gear member 30 made of synthetic resin divided into two on the inner and outer periphery, and these gears. And an O-ring 40 made of synthetic rubber interposed between the members. Specifically, the outer peripheral side gear member 30 is meshed with a driving side gear member (both not shown) connected to an electric motor serving as a driving source. In addition, the inner peripheral side gear member 20 is integrally formed with a pinion 21 that meshes with a lens cover (not shown) in which a gear is cut and a rack is formed, thereby forming a rack pinion. doing. Therefore, the torque supplied from the electric motor is transmitted to the pinion 21 of the inner peripheral side gear member 20, and the lens cover is caused to reciprocate linearly in response to the transmitted torque.
Below, the detailed structure of the gear 10 with a torque limiter mechanism is demonstrated.

First, as shown in FIGS. 2 and 3, the inner peripheral gear member 20 is fitted to the pinion 21 formed with a tooth portion 21 a meshed with the rack of the lens cover and the outer peripheral gear member 30. The mounting portion 22 for mounting together is integrally formed.
Specifically, as shown in FIG. 3, the attachment portion 22 is formed adjacent to the pinion 21 in the rotation axis direction, and its outer diameter is larger than the outer diameter of the pinion 21. Further, a groove 24 into which the O-ring 40 can be fitted is formed on the outer peripheral surface 23 of the attachment portion 22 in the circumferential direction. More specifically, as well shown in FIG. 3, the shape of the groove 24 is formed in an arc shape corresponding to the cross-sectional shape of the O-ring 40, and the contact area when the O-ring 40 is fitted is large. It is trying to become. Here, the groove 24 corresponds to the fitting shape of the present invention. In addition, a through hole 25 is formed in the rotation axis of the inner peripheral side gear member 20, and a shaft pin (not shown) for holding the axis position at the time of assembly can be inserted.

Next, as shown in FIGS. 4 and 5, the outer peripheral side gear member 30 is attached by fitting the tooth portion 31 meshed with the driving side gear member and the mounting portion 22 of the inner peripheral side gear member 20. Attached portion 32 to be attached.
Specifically, as shown in FIG. 4, the mounted portion 32 forms an inner peripheral surface 33 of the outer peripheral side gear member 30, and the inner peripheral surface 33 has an O-ring 40 (see FIG. 6). Is formed in the circumferential direction. More specifically, the diameter (inner diameter) of the inner peripheral surface 33 of the mounted portion 32 is set larger than the outer diameter of the mounting portion 22 of the inner peripheral side gear member 20, for example, a state in which only the two are fitted together Then, a fixed gap is formed between the outer peripheral surface 23 of the mounting portion 22 and the inner peripheral surface 33 of the mounted portion 32 (see FIG. 6). Further, the shape of the groove 34 of the mounted portion 32 is a concave shape as shown in FIGS. 5 and 6 so that a fixed contact surface is formed when the O-ring 40 is fitted. It is considered as a setting. Here, the groove 34 corresponds to the fitting shape of the present invention.

  Next, the O-ring 40 made of synthetic rubber is an elastic member having an O-shaped cross section formed in an annular shape. Specifically, the inner diameter of the O-ring 40 is set to be an interference fit with respect to the shape of the outer peripheral surface 23 of the inner peripheral side gear member 20. That is, it is set so as to be an interference fit with respect to the groove 24 formed in the outer peripheral surface 23. Further, the thickness of the O-ring 40 is larger than the size of the gap formed between the outer peripheral surface 23 and the inner peripheral surface 33 when the inner peripheral gear member 20 is fitted into the outer peripheral gear member 30. It is formed as follows. Note that grease is applied to the O-ring 40 in order to prevent lubricant during assembly and frictional noise during use.

Therefore, the O-ring 40 formed in this way is assembled as follows.
That is, the O-ring 40 is attached to the outer peripheral surface 23 of the inner peripheral side gear member 20 that is interference-fitted with the elasticity while being stretched against elasticity. Specifically, first, one portion of the O-ring 40 is hooked into the groove 24 of the outer peripheral surface 23, and the other portion is sequentially hooked into the groove 24 while being stretched against elasticity. At this time, utilizing the fact that the cross section of the O-ring 40 is formed in an O-shape, the O-shaped curved surface can be hooked so as to slide on the outer peripheral surface 23. When the portion of the extended O-ring 40 reaches the outer peripheral surface 23 and then is released, the O-ring 40 is contracted in the circumferential direction by its elastic force (restoring force) and is fitted in the groove 24. . Specifically, as well shown in FIG. 3, since the O-ring 40 is in surface contact with the arc-shaped groove 24 (the shape of the outer peripheral surface 23 of the inner peripheral side gear member 20), the O-ring 40 is mounted in a close fitting state and positioned. Is made.
Next, the inner peripheral side gear member 20 with the O-ring 40 attached is fitted to the outer peripheral side gear member 30. At this time, the O-ring 40 mounted on the outer peripheral surface 23 of the inner peripheral gear member 20 interferes with the inner peripheral surface 33 of the outer peripheral gear member 30, but the O-ring 40 is elastically constricted so that it is fitted. Can do. Then, when the O-ring 40 reaches the groove 34 of the outer peripheral side gear member 30, the O-ring 40 is expanded by the elastic force and fits into the groove 34 of the outer peripheral side gear member 30 as shown in FIG. To do. Thereby, positioning at the time of fitting inner peripheral side gear member 20 in outer peripheral side gear member 30 is made. At this time, the expansion of the O-ring 40 is performed up to the clearance dimension between the groove 24 formed on the outer peripheral surface 23 of the inner peripheral side gear member 20 and the groove 34 formed on the inner peripheral surface 33 of the outer peripheral side gear member 30. The cross section is in a state compressed moderately from both sides. Therefore, the inner peripheral side gear member 20 and the outer peripheral side gear member 30 are connected to each other by the elastic force of the compressed O-ring 40. That is, the gap size between the outer peripheral surface 23 of the inner peripheral side gear member 20 and the inner peripheral surface 33 of the outer peripheral side gear member 30 is absorbed by the elasticity of the O-ring 40.

  Thus, the gear 10 with the torque limiter mechanism is in a state where the inner peripheral side gear member 20 and the outer peripheral side gear member 30 are connected by the elastic force of the O-ring 40. Therefore, when torque is transmitted from the drive side gear member, torque is transmitted from the outer peripheral side gear member 30 to the inner peripheral side gear member 20 by the action of the frictional force accompanying the elastic force of the O-ring 40. Specifically, this torque transmission is such that torque up to a predetermined value is transmitted by setting the shape and material of the O-ring 40. The torque transmission can open and close the lens cover of the projector.

Then, the usage method of the gear 10 with a torque limiter mechanism of a present Example is demonstrated.
As described above, the drive torque supplied from the drive motor as the drive source is transmitted to the lens cover of the projector via the torque transmission mechanism such as the drive side gear member and the gear 10 with the torque limiter mechanism. Specifically, the power transmission in the torque limiter-equipped gear 10 is a frictional force accompanying the elastic force of the O-ring 40 interposed (fitted) between the outer peripheral side gear member 30 and the inner peripheral side gear member 20. Has been done by. Then, the lens cover is opened and closed by the transmitted torque.
At this time, for example, when a finger is put between the lens cover during the opening and closing movement, a torque (overload) of a predetermined value or more acts on the inner peripheral side gear member 20 that forms a rack and pinion with the lens cover. However, when a torque greater than such a predetermined value, that is, a torque greater than the frictional force associated with the elastic force of the O-ring 40 is applied between the inner peripheral gear member 20 and the outer peripheral gear member 30, Slip occurs at this connecting portion. Specifically, the slippage occurs between the O-ring 40 brought into close contact with the outer peripheral surface 23 (groove 24) of the inner peripheral gear member 20 and the inner peripheral surface 33 (groove 34) of the outer peripheral gear member 30. (Relative rotation) occurs. Therefore, torque corresponding to a predetermined value or more is absorbed along with the slip. Along with this sliding, a sliding frictional force due to the elastic force of the O-ring 40 acts on the contact sliding portion, so that a predetermined value is applied from the outer peripheral side gear member 30 to the inner peripheral side gear member 20. Torque transmission up to is continuously performed. Further, since the O-ring 40 is fitted in the groove 24 of the inner peripheral side gear member 20 and the groove 34 of the outer peripheral side gear member 30, they are not pulled out during use, and stable torque transmission is performed. Is called. Therefore, the fingers sandwiched between the lens covers are not overloaded, so that no pain is required. Further, torque exceeding a predetermined value is not transmitted to each component member arranged on the drive side.

Thus, the torque limiter-equipped gear 10 of the present embodiment has a simple and inexpensive configuration in which the synthetic rubber O-ring 40 is interposed between the inner peripheral side gear member 20 and the outer peripheral side gear member 30. A stable torque limiter function can be exhibited. That is, the fitting gap between the inner peripheral side gear member 20 and the outer peripheral side gear member 30 can be absorbed by the elasticity of the O-ring 40. Therefore, for example, even if this gap dimension changes due to an external load such as repeated use or temperature change, this dimensional error can be absorbed by the elasticity of the O-ring 40. Thereby, a fitting state can be stabilized. Therefore, since there is little influence by the external load at the time of use, it can be used with a long life and high reliability. Moreover, even if it is incorporated and used in such a small mechanism, the structure is not complicated and an inexpensive configuration can be obtained. Even at the time of designing, the fitting dimensional tolerance between the inner peripheral side gear member 20 and the outer peripheral side gear member 30 can be absorbed by this elasticity. Therefore, for example, by adjusting the shape and material of the O-ring 40, the torque transmission limit value can be easily adjusted.
Further, since the grooves 24 and 34 are formed in the inner peripheral gear member 20 and the outer peripheral gear member 30, respectively, the fitting state of the O-ring 40 is kept constant, and the torque limiter function is stably exhibited. be able to. Further, when the O-ring 40 is assembled, positioning is performed by the grooves 24 and 34, so that the assembly can be easily performed.
Furthermore, since the torque limiter function can be exhibited using the O-ring 40 which is a general-purpose component, the configuration can be simplified and inexpensive. Further, the O-ring 40 has an O-shaped cross section and is formed in an interference fit shape with respect to the mounting portion 22 of the inner peripheral side gear member 20, so that it is assembled using its curved surface and elasticity. Can be easily performed, and the fitting state can be improved.
Furthermore, it is preferable to apply grease to the O-ring 40 because it is easy to assemble and friction noise during use can be prevented.

Although the embodiment of the present invention has been described with respect to one example, the present invention can be implemented in various forms other than the above-described embodiment.
For example, in this embodiment, the outer peripheral side gear member 30 is engaged with the driving side gear member, and the inner peripheral side gear member 20 is arranged as a driven side gear member (in which the pinion 21 is integrally formed). However, the drive side and the driven side may be arranged on either side.
Moreover, although what showed the grooves 24 and 34 equivalent to the fitting shape of this invention in both the inner peripheral side gear member 20 and the outer peripheral side gear member 30 was shown, it formed in either one side. There may be. The shape of the grooves 24 and 34 is not limited to the shape shown in the present embodiment. For example, a locking member that can position the O-ring at the assembly position is provided in the circumferential direction. Also good. In this case, care must be taken so that the locking member does not protrude beyond the thickness of the O-ring.
Furthermore, although the size shape of the O-ring 40 is shown to be an interference fit shape with respect to the shape of the outer peripheral surface 23 of the inner peripheral side gear member 20, the shape of the inner peripheral surface 33 of the outer peripheral side gear member 30 is shown. However, it may be formed in an interference fit shape. However, in this case, the shape of the O-ring is such that the compression force received when the inner peripheral surface 33 is attached to the shape does not cause the O-ring to be attached in a surplus shape with buckling. It is necessary to set the material.
Furthermore, although the shape of the inner peripheral side gear member 20 showed what integrally formed the attachment part 22 and the pinion 21 in which the tooth part 21a was formed in the outer side, for example, it has a tooth part inside, A gear member having a shape in which a mounting portion is formed on the outer peripheral surface thereof may be used. Moreover, the inner peripheral side gear member should just be provided with the structure for performing torque transmission, and the tooth | gear part does not necessarily need to be formed. For example, a configuration in which a shaft pin is fitted and torque is transmitted may be used.

It is a perspective view which shows the external appearance of the gear with a torque limiter mechanism of a present Example. It is a front view of an inner peripheral side gear member. It is sectional drawing which looked at the inner peripheral side gear member from the side. It is a front view of an outer peripheral side gear member. It is sectional drawing which looked at the outer peripheral side gear member by the side view. It is sectional drawing which looked at the gear with a torque limiter mechanism from the side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Gear with torque limiter mechanism 20 Inner peripheral side gear member 21 Pinion 21a Tooth part 22 Mounting part 23 Outer peripheral surface 24 Groove (Fitting shape)
25 Through-hole 30 Outer peripheral side gear member 31 Tooth part 32 Mounted part 33 Inner peripheral surface 34 Groove (fit shape)
40 O-ring

Claims (5)

An annular friction transmission member made of an elastic material formed in an annular shape that transmits torque by friction force is interposed between the gear members divided into two on the inner and outer periphery,
When torque is transmitted from one side of the inner peripheral side gear member and the outer peripheral side gear member to the other side by the annular frictional transmission member, slip occurs when the transmitted torque exceeds a predetermined value. A gear with a torque limiter mechanism, which is configured to transmit torque up to torque. A gear with a torque limiter mechanism according to claim 1,
An annular friction transmission member made of the elastic material is formed in an interference fit shape with respect to the outer peripheral surface shape of the inner peripheral side gear member. A gear with a torque limiter mechanism according to claim 1 or 2,
At least one of the outer peripheral surface of the inner peripheral side gear member and the inner peripheral surface of the outer peripheral side gear member on which the annular frictional transmission member is interposed has a fitting shape capable of fitting the annular frictional transmission member. A gear with a torque limiter mechanism, characterized by being formed. A gear with a torque limiter mechanism according to any one of claims 1 to 3,
A gear with a torque limiter mechanism, wherein the annular frictional transmission member is formed in an O-shaped cross section. A gear with a torque limiter mechanism according to any one of claims 1 to 4,
The annular frictional transmission member is an O-ring, and a gear with a torque limiter mechanism.

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