JPH08178012A - Torque limiting mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a torque limiting mechanism which has less backlash, a constant breaking torque, and does not freely rotate the driven side even when the excessive torque is cut off. [Structure] Ball 10 inserted in hole of inner rotor 2
Is pressed against the outer rotor 5 by the spring 11, and the friction plate 10 engaged with the outer rotor 5 is pressed against the inner flange 1 by the disc spring 18. [Effect] When an excessive torque is applied, the reaction force of the spring 11 is lost and the ball 10 is pulled in to interrupt the torque. However, since the torque due to friction always acts between the friction plate 13 and the inner flange 1, the minimum necessary torque is always transmitted. Since it is a ball type, there is little backlash, and the driven side does not rotate freely even when the torque is cut off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device having a drive source (for example, a motor) and a driven object (for example, an antenna), which is interposed between the drive source and the driven object, and the drive source runs away. The present invention relates to a torque limiting mechanism used for the purpose of protecting a driven object from overload.

[0002]

2. Description of the Related Art FIG. 11 is a sectional view showing an embodiment of a conventional torque limiting mechanism. FIG. 12 is an exploded view thereof. Reference numeral 1 is an inner flange that receives torque from a drive source, 2 is an inner rotor that is also fixed to the inner flange 1 and transmits torque, 4 is a set screw that fixes the inner flange 1 to the inner rotor 2, and 5 is a driven object side that receives torque Outer rotors 5 and 7 for transmitting torque to the outer rotor 5 and the inner rotor 2 are supported by bearings, 8 is a bearing retainer for fixing the bearing 7, 9 is a set screw for fixing the bearing retainer 8 to the outer rotor 5, and 12 is the inner rotor 2 described above.
Spline claw 14 that engages with spline groove 16 provided in
Is a friction plate (inside), 13 is a friction plate (outside) with a spline claw 15 that meshes with a spline groove 17 provided in the outer rotor 5, and 18 is a disc that generates a force to press the friction plate against the inner flange 1. spring,
Reference numeral 19 is a ring nut for fixing the disc spring 18.

Conventionally, a friction plate (inner side) 12 having the above-mentioned structure and having a spline claw 14 that meshes with the spline groove 16 of the inner rotor 2, and a friction plate having a spline claw 15 that meshes with the spline groove 17 of the outer rotor 5 as well. The plates (outside) 13 are alternately stacked so as to be adjacent to each other, and tightened with a ring nut 19 via a disc spring 18.

With the above-described structure, the inner rotor 2 and the friction plate (inner side) 12, and the outer rotor 5 and the friction plate (outer side) 13 are simply engaged with the spline grooves 16 and 17 and the spline claws 14 and 15. , Rotation is restricted, but not axially restricted. All the friction plates (inside) 12 and the friction plates (outside) 13 are pressed against each other by the repulsive force of the disc spring 18. On the other hand, the inner rotor 2 and the friction plate (inner side) 12 whose rotation is restricted always rotate simultaneously. Similarly, the outer rotor 5 and the friction plate (outer side) 13 always rotate simultaneously. Since the adjacent friction plates are pressed against each other by the repulsive force of the disc spring 18, a friction force is generated between the surface of the friction plate (inside) 12 and the surface of the friction plate (outside) 13. When the mechanism is rotating with a torque equal to or less than this frictional force, the friction plates 12 and 13 cannot slide, so that they also always rotate simultaneously. Therefore, the inner rotor 2, the friction plate (inside) 12, the friction plate (outside) 13, and the outer rotor 5 always rotate simultaneously. As described above, in the rotation state below the normal friction torque,
The mechanism always transmits the rotation together.

When a torque of a predetermined value or more (torque of a friction torque or more) is applied, a large torque is applied to the inner rotor 2 and the outer rotor 5. Large torque is also applied to the friction plate (inside) 12 and the friction plate (outside) 13 whose rotations are restricted by each. Since the repulsive force of the disc spring 18 pressing the friction plates 12 and 13 is constant, the friction force is also constant. When a large torque is applied, the friction force cannot be withstood, and the friction plate (inside) 12 and the friction plate (outside) 1
Sliding occurs during 3. Therefore, the inner rotor 2 and the outer rotor 5 do not rotate as a unit, and torque due to frictional force is transmitted from the inner rotor 2 to the outer rotor 5, but no more torque is transmitted. As described above, in the rotation state above the friction torque, the torque larger than the friction torque is cut off.

FIG. 15 is a sectional view showing another embodiment of the conventional torque limiting mechanism. FIG. 16 is an exploded view thereof. FIG. 17 is a sectional view of an example in which this torque limiting mechanism is mounted on a gear drive mechanism. FIG. 18 shows an example of a device that drives a driven object with the gear drive mechanism. 1, 2, 4, 5, 7 to 9 are exactly the same as the embodiment of the conventional mechanism of FIG. Three
Is a hole provided in the inner rotor 2, 6 is a hole provided in the outer rotor 5, 10 is a ball which is inserted into the hole 3 provided in the inner rotor 2 and transmits torque to the outer rotor 5 through the hole 6,
Reference numeral 11 is a spring that presses the ball 10 into the hole 6 provided in the outer rotor 5, 28 is a casing that supports components included in the gear drive mechanism, 29 is a drive source (for example, a motor) that generates torque for rotating gears and other rotating objects, Thirty
Is a drive gear that is fixed to the rotating shaft of the drive source and transmits the generated torque, 31 is an intermediate gear that receives the torque from the drive gear and transmits the torque to the inner flange 1 of the torque limiting mechanism, and 32 is the gear that receives the torque from the outer rotor 5. A pinion gear that transmits torque from the drive mechanism to the outside, 33 is a stopper for limiting the rotation angle, 34 is a sector gear that receives torque from the pinion gear 32, 35 is a fixed portion that holds the entire device, and 36 is torque that is transmitted from the sector gear 34. Rotating part to receive,
Reference numeral 37 is a driven object (for example, a camera) that is finally driven by a torque.

In the torque limiting mechanism constructed as described above, in a normal rotating state, the spring 11 presses the ball 10 arranged inside the hole 3 of the inner rotor 2 toward the outer rotor 5 side, and the ball 10 Is pushed into the hole 6 of the outer rotor 5 and acts as a detent to transmit torque.

When a torque larger than a predetermined value is applied, the force acting on the ball 10 becomes larger than the pressing force of the spring 11, the ball 10 is pushed inward, the inner rotor 2 and the outer rotor 5 are not detented, and the torque is shut off. To be done.

Due to this action, for example, when some abnormality occurs in the drive source 29 and a torque more than a predetermined value is applied to the inner flange 1 and the inner rotor 2, the torque is cut off and the driven element connected behind the outer rotor 5 is driven. This has the effect of protecting the object 37 from abnormal torque.

[0010]

The above-mentioned equipment has the following problems.

In the conventional mechanism of FIG. 11, the friction plate (inside) is used.
The friction plate 12 and the friction plate (outer side) 13 must move in the axial direction (direction perpendicular to the paper surface) and must not rotate.
4, the spline groove 16 of the inner rotor 2 and the spline claw (14) of the friction plate (inner side) 12 or the spline groove 17 of the outer rotor 5 and the spline claw 15 of the friction plate (outer side) 13 are suitable for spline parts. It is unavoidable to provide a gap. However, due to this gap, there is rattling in rotation during torque transmission. Therefore, it is possible to reduce the play by making the gap as small as possible,
Since the spline grooves 16 and 17 and the claws 14 and 15 are rotationally constrained, it is difficult to insert the plate into the rotor if the gaps between them are made small, and it is difficult to move smoothly in the axial direction even after the insertion. Also, to reduce the gap,
Since it is necessary to reduce the difference between the groove widths of the splines 16 and 17 and the claw widths of 14 and 15, and also to reduce the distance between the grooves of the spline and the distance between the claws of the friction plate to be smaller than the gap, It was necessary to process each part with 30% accuracy. Conversely speaking, the gap of the spline can be driven only to an accuracy 3 to 5 times as high as the processing accuracy (even if the processing accuracy is 0.1 mm, it can only be about 0.3 mm). Further, even if it is forcibly attempted to manufacture a highly accurate product, the accuracy of the parts becomes high, and the torque limiting mechanism as a whole tends to be expensive. Therefore, in general, many torque limiting mechanisms of this type cannot be precisely positioned, and therefore cannot be applied to equipment that requires precision. Therefore, there has been a problem that the backlash must be reduced by simple processing (that is, inexpensively).

Further, the conventional mechanism of FIG. 11 transmits torque only by friction, but the friction force is determined by the friction coefficient and the pressing force. The coefficient of friction is calculated by
It changes greatly depending on humidity or usage time (usually 1
0%, the maximum is about 20%). This change causes a change in the frictional force, but since a change in the frictional force leads to a change in the breaking torque, it is difficult to set an accurate torque with this type of torque limiting mechanism, and it is necessary to set the breaking torque accurately. There was also the issue that there was.

Similarly, in the conventional mechanism of FIG. 11, even when excessive torque is input and the torque is cut off, the friction torque is always transmitted. Therefore, the problem that the mechanism idles when the excessive torque is cut off does not occur. However, since the friction torque equal to the breaking torque is always transmitted,
The driven object will continue to accelerate. Set the breaking torque near the limit of the strength of the equipment. Even when the torque is cut off, the device must be designed with extra strength because it must not be broken even if it is accelerated by the torque. However, when the drive source is out of control, it is an emergency and it is not necessary to ensure accuracy, so a torque sufficient to support the weight of the device at the time of disconnection is sufficient. Therefore, when the excessive torque is cut off, only the minimum torque is transmitted, and it is not necessary to transmit the excessive torque.

On the other hand, the conventional mechanism shown in FIG. 15 is an example of a torque limiting mechanism which can be accurately positioned with respect to the above problems and has a small backlash. The backlash between the inner rotor 2 and the outer rotor 5 is determined only by the gap between the outer diameter of the ball 10 and the inner diameter of the hole 3 of the inner rotor 2. Since the diameter of the ball 10 is a sphere and has a simple shape, it is relatively easy to obtain accuracy (for example, the accuracy of the diameter of the steel ball used for the bearing is several μm or less). In addition, since the hole 3 of the inner rotor 2 is also a round hole, it is easy to obtain accuracy (generally, a round hole having an accuracy of about 1/200 of the diameter has a simple shape, and no special processing is required). Therefore, it is possible to hold the gap within 0.01 mm by general processing (that is, at low cost).

The breaking torque of this type of torque limiting mechanism is determined by the spring force of the spring 11. Since the spring force can always produce a constant force, the breaking torque can also be kept constant.

However, in this type of torque limiting mechanism, when excessive torque is applied and the torque is cut off, the detent between the outer rotor 5 and the inner rotor 2 is completely eliminated, so that the outer rotor 5 side can freely rotate. Become. Since the outer rotor 5 side is the driven side, its tip is connected to a driven object 37 such as an antenna or a camera. When the outer rotor 5 can rotate freely, the entire driven side starts to rotate due to the weight of the driven object 37. When the angle becomes equal to or larger than a predetermined angle, the stopper 33 is stopped and the rotation is stopped. However, the impact when the stopper 33 is stopped affects the driven object 37. Further, it is very dangerous for the surroundings to freely rotate the driven object 37 because the speed cannot be controlled. Therefore, there is a problem in that the required torque must always be transmitted instead of causing the outer rotor 5 to idle even when the power is cut off.

Since the conventional torque limiting mechanism has the above problems, there is provided a torque limiting mechanism which has a small amount of backlash, can set an accurate torque, and can generate a minimum torque for holding the device even when the power is cut off. Was desired.

The present invention has been made in order to solve the above problems, and it has a small backlash and an accurate set value of the breaking torque. Further, the excessive torque is prevented from idling and the required torque is transmitted even after the breaking. The purpose is to obtain such a torque limiting mechanism.

[0019]

The torque limiting mechanism of the present invention adopts a method of pressing the ball 10 against the outer rotor 5 in order to generate an accurate and less interrupting torque, and the outer rotor 5 and the inner flange 1 have friction parts. Is provided so that torque is transmitted even after interruption.

Further, according to the present invention, not the friction portion but the helical gear is provided, and the torque is transmitted even after the interruption due to the transmission efficiency of the gear.

In the present invention, in order to further reduce the torque fluctuation at the time of breaking, a mechanism for pressing the friction plate 14 only at the time of breaking is provided.

Further, in order to further safeguard the equipment at the time of interruption, the present invention is provided with a mechanism for generating a braking torque, not a transmission torque, for pushing the rod from the outer rotor 5 to the casing 28 only at the time of interruption. Is.

[0023]

According to the present invention, in the normal rotation state, the spring 11 presses the inner ball 10 into the hole 3 of the inner rotor 2 toward the outer rotor 5 side, and the ball 1
0 is pushed into the hole 6 of the outer rotor 5 and acts as a detent to transmit torque. However, when a torque larger than a predetermined value is applied, the force acting on the ball 10 becomes larger than the pressing force of the spring 11 and the ball 10 Is pushed inward, so that the inner rotor 2 and the outer rotor 5 do not have a detent, and have an effect of cutting off an excessive torque. Since the detent during torque transmission is a method of pressing the ball 10 into the hole 6 of the outer rotor 5, it has an effect of being inexpensive, less rattling, and accurately interrupting torque. Further, even when the excessive torque is cut off and the inner rotor 2 and the outer rotor 5 rotate relative to each other, the minimum necessary torque is transmitted through the friction plate 15 connected to the outer flange 5 from the inner flange 1 even after the cutoff.

Further, in the present invention, the inner rotor 2 and the outer rotor 5 are cut off by cutting off the excessive torque as described above.
Also has a function of transmitting the minimum required torque from the gear portion provided on the inner flange 1 through the helical gear 20 to the gear portion provided on the outer rotor 5 even after the interruption.

In the present invention, when the inner rotor 2 and the outer rotor 5 rotate relative to each other by cutting off the excessive torque as described above, the ball 10 moves inward, and at the same time, the rod 23, the taper plate 25, and the friction plate 12 move. The friction plate 12 and the bearing retainer 8 come into contact with each other as they move, generating friction torque. This friction torque has a function of transmitting the minimum necessary torque even after the cutoff.

Further, in the present invention, the inner rotor 2 and the outer rotor 5 are cut off by cutting off the excessive torque as described above.
When the balls rotate relative to each other, the ball 10 moves outward,
At the same time, the friction rod 27 moves and the tip of the friction rod 27 and the casing 28 come into contact with each other to generate friction torque.
This friction torque has the effect of transmitting the braking force after interruption.

[0027]

【Example】

Example 1. FIG. 1 is a sectional view showing an embodiment of the invention of claim 1. FIG. 2 is an exploded view thereof. In the figure, 1-1
1 is exactly the same as the embodiment of the conventional mechanism of FIG. Reference numerals 13, 15, 17, 18, and 19 have the same functions as those of the conventional mechanism shown in FIG.

In the torque limiting mechanism constructed as described above, the inner rotor 2 and the outer rotor 5 rotate in a one-to-one relationship when rotating at a normal torque, and when the breaking torque or more is reached, the ball is passed through the hole 6 of the outer rotor 5. 10 slips off and tries to start spinning. However, the outer rotor 5
Since the friction plate (outside) 13 engaged with the spline groove 17 is pressed against the inner flange 1 by the disc spring 18, only the friction torque between the friction plate (outside) 13 and the inner flange 1 is always transmitted.

The play between the inner rotor 2 and the outer rotor 5 of this torque limiting mechanism is determined by the gap between the outer diameter of the ball 10 and the inner diameter of the hole 3 of the inner rotor 2. Since it is a combination of the inner diameter of the round hole and the outer diameter of the sphere, the gap can be made minute and the play can be reduced.

The breaking torque of the torque limiting mechanism is the repulsive force of the spring 11 for pressing the ball 10 against the hole 6 of the outer rotor 5, the inner flange 1 and the friction plate 13.
It is determined by the frictional force generated during. Friction is 10 to 20 depending on the surrounding conditions, temperature, humidity, or usage time.
Although it changes about%, the friction torque is often set to 10% or less of the breaking torque because only the torque necessary for breaking is transmitted. Even if 10 to 20% of the change occurs, the change is 1 to 2% or less from the whole breaking torque, so that the breaking torque hardly changes. On the other hand, the repulsive force of the spring 11 that determines the remaining torque value of 90% or more is unlikely to change. Therefore, this torque limiting mechanism can accurately set the value of the breaking torque.

Further, since the frictional force generated between the inner flange 1 of this torque limiting mechanism and the friction plate is always generated, if this frictional torque is set to the same value as the torque required for holding the torque, the torque is cut off. After that, a holding torque is generated and idling can be prevented.

Example 2. FIG. 3 is a sectional view showing a second embodiment of the present invention. FIG. 4 is an exploded view thereof. FIG. 5 is an enlarged view of the gear unit.

In the figure, 1 to 11 are exactly the same as the embodiment of the conventional mechanism of FIG. Inner flange 1
A gear is provided on the outer rotor 5. Reference numeral 20 is a helical gear that transmits torque to the gear portion by meshing gear efficiency, and 21 is a gear holder that fixes the helical gear 20.

In the torque limiting mechanism configured as described above, as in the case of the above-described first embodiment, when the cutoff torque is exceeded, the ball 10 comes out of the hole 6 of the outer rotor 5 and tries to start idling. However, the outer rotor 5 and the gear portion of the inner flange 1 are engaged with each other by the helical gear 20. Generally, the helical gear 20 has low efficiency and does not rotate smoothly and generates a resistance force. Therefore, when the outer rotor 5 and the inner flange 1 start relative rotation, a resistance force is always generated. The transmission torque due to the resistance force is always transmitted.

The backlash between the inner rotor 2 and the outer rotor 5 of this torque limiting mechanism is the same as in the first embodiment.
It is determined by the gap between the outer diameter of the ball 10 and the inner diameter of the hole 3 of the inner rotor 2. Since it is a combination of the inner diameter of the round hole and the outer diameter of the sphere, the gap can be made minute and the play can be reduced.

The breaking torque of the torque limiting mechanism is determined by the repulsive force of the spring 11 for pressing the ball 10 against the hole 6 of the outer rotor 5 and the resistance force generated between the inner flange 1, the outer rotor 5 and the helical gear 20. The resistance force of the torsion gear 20 is determined by its transmission efficiency. Since the transmission efficiency of the torsion gear 20 is almost determined by the twist angle and the twist angle does not change, the torque due to the resistance force hardly changes. Further, the repulsive force of the spring 11 is hard to change. Therefore, this torque limiting mechanism can accurately set the value of the breaking torque.

Further, since the resistance force generated between the inner flange 1 of the torque limiting mechanism, the outer rotor 5 and the helical gear 20 is always generated, the torque due to this resistance force becomes the same value as the torque required for holding. If set,
Even after the torque is cut off, the holding torque can be generated to prevent idling.

Example 3. FIG. 6 is a sectional view showing a third embodiment of the present invention. FIG. 7 is an exploded view thereof.

In the figure, 1 to 11 are exactly the same as the embodiment of the conventional mechanism of FIG. The inner rotor 2 is provided with a penetrating portion 22 in the hole 3 for accommodating the spline groove 16 and the spring 11. Reference numeral 12 is a friction plate provided with a spline claw 14 that engages with the spline groove 16, and 23 is a penetrating portion 2.
Reference numeral 25 is a rod which is inserted into the shaft 2 and has a wedge-shaped inclined portion 24 at its tip, and 25 is a tapered plate 25 which has a tapered portion 26 that engages with the inclined portion 24 of the rod 23 and presses the friction plate 12 against the bearing retainer 8. The bearing retainer 8 extends so as to contact the friction plate 12.

In the torque limiting mechanism constructed as described above, the state is exactly the same as that of the conventional equipment until the torque reaches the breaking torque. When the ball 10 is disengaged from the hole 6 of the outer rotor 5 due to the breaking torque or more, the ball 10 is pushed inward. At the same time, the rod 23 is also pushed inward, and the taper plate 25 is pushed toward the bearing retainer 8 side by the inclined portion 24 at the tip. Since the friction plate 12 is pressed against the bearing retainer 8, the friction torque is newly transmitted after the torque is cut off.

The play between the inner rotor 2 and the outer rotor 5 of this torque limiting mechanism is determined by the gap between the outer diameter of the ball 10 and the inner diameter of the hole 3 of the inner rotor 2. Since it is a combination of the inner diameter of the round hole and the outer diameter of the sphere, the gap can be made minute and the play can be reduced.

The breaking torque of the torque limiting mechanism is determined by the repulsive force of the spring 11 that presses the ball 10 against the hole 6 of the outer rotor 5. Spring 11
Since the repulsive force of is difficult to change, this torque limiting mechanism can accurately set the value of the breaking torque.

Further, since the torque limiting mechanism always generates a frictional force between the friction plate 12 and the bearing retainer 8 when the excessive torque is cut off, this frictional torque is set to the same value as the torque required for holding. If so, the holding torque is generated even after the torque is cut off, and idling can be prevented.

Example 4. FIG. 8 is a sectional view showing Embodiment 4 of the present invention. FIG. 9 is an exploded view thereof. FIG. 10 is a sectional view of an example in which this torque limiting mechanism is mounted on a gear drive mechanism.

In the figure, 1 to 11 and 28 to 32 are shown in FIG.
5 is the same as the embodiment of the conventional mechanism of FIG. Move the ball 10 and the spring 11 to the outer rotor 5 side, and insert the penetrating portion 2 into the hole for housing the ball 10 and the spring 11.
2 is provided. Reference numeral 27 is a friction rod that is inserted into the penetrating portion 22 and has a friction portion at the tip.

In the torque limiting mechanism constructed as described above, the state is exactly the same as that of the conventional equipment until the torque reaches the breaking torque. When the ball 10 is disengaged from the hole 3 of the inner rotor 2 due to the breaking torque or more, the ball 10 is pushed outward. At the same time, the friction rod 27 is also pushed outward, and the flat portion of the tip is pressed against the casing 28, so that a braking force for stopping the rotation is exerted after the torque is cut off.

The play between the inner rotor 2 and the outer rotor 5 of this torque limiting mechanism is determined by the gap between the outer diameter of the ball 10 and the inner diameter of the hole 6 of the outer rotor 5. Since it is a combination of the inner diameter of the round hole and the outer diameter of the sphere, the gap can be made minute and the play can be reduced.

The breaking torque of the torque limiting mechanism is determined by the repulsive force of the spring 11 that presses the ball 10 against the hole 3 of the inner rotor 2. Spring 11
Since the repulsive force of is difficult to change, this torque limiting mechanism can accurately set the value of the breaking torque.

Further, since the torque limiting mechanism always generates a frictional force between the friction rod 27 and the housing when the excessive torque is cut off, the braking torque due to this frictional force is set to the same value as the torque required for holding. If you do
When the torque is cut off, braking torque is generated to stop the outer rotor 5 side, and idling can be prevented.

[0050]

As described above, according to the present invention, the inner rotor 2 and the outer rotor 5 are connected to the spring 11 and the ball 1.
Even if the detent is stopped at 0 and the detent is released, part of the torque is transmitted by the friction plate 13 that is rotationally fixed by the spline, and part of the torque is transmitted by the helical gear 20.
With a simple mechanism of pressing the friction plate 14 with the tapered rod 23 to transmit a part of the torque and pressing the friction rod 27 against the casing 28 to generate a braking force, the torque can be accurately cut off with less rattle. Even after the torque is cut off, the rotating side does not rotate freely.

Further, according to the present invention, since the helical gear 20 is used for transmitting the torque after the interruption and the torque due to the friction is not used, the influence of temperature and repeated use is small,
There is an effect that the torque after the interruption can be stably supplied.

According to the present invention, the friction torque does not work at all before the cutoff and the friction torque is generated only when the cutoff is made, and the cutoff torque is determined only by the pressing force of the spring.
The effect is that the breaking torque can be set precisely.

Further, according to the present invention, the braking force can be generated in the outer rotor 5 to which the device is connected after the disconnection, so that there is no possibility of rotating up to the angle limit and colliding, and the impact on the device is extremely reduced. The effect is that you can do it.

[Brief description of drawings]

FIG. 1 is a sectional view of a torque limiting mechanism showing a first embodiment of the present invention.

FIG. 2 is an exploded view of the torque limiting mechanism showing the first embodiment of the present invention.

FIG. 3 is a sectional view of a torque limiting mechanism showing a second embodiment of the present invention.

FIG. 4 is an exploded view of a torque limiting mechanism showing a second embodiment of the present invention.

FIG. 5 is an enlarged view of a gear part showing a second embodiment of the present invention.

FIG. 6 is a sectional view of a torque limiting mechanism showing a third embodiment of the present invention.

FIG. 7 is an exploded view of a torque limiting mechanism showing a third embodiment of the present invention.

FIG. 8 is a sectional view of a torque limiting mechanism showing a fourth embodiment of the present invention.

FIG. 9 is an exploded view of a torque limiting mechanism showing a fourth embodiment of the present invention.

FIG. 10 is a sectional view of an example in which Embodiment 4 of the present invention is mounted on a gear drive mechanism.

FIG. 11 is a sectional view of a torque limiting mechanism showing an example of a conventional mechanism.

FIG. 12 is an exploded view of a torque limiting mechanism showing an example of a conventional mechanism.

FIG. 13 is a cross-sectional view showing a relationship between an inner rotor and a friction plate (inside) of an example of a conventional mechanism.

FIG. 14 is a cross-sectional view showing a relationship between an inner rotor and a friction plate (outside) of an example of a conventional mechanism.

FIG. 15 is a sectional view of a torque limiting mechanism showing an example of a conventional mechanism.

FIG. 16 is an exploded view of a torque limiting mechanism showing an example of a conventional mechanism.

FIG. 17 is a sectional view of an example in which an example of a conventional mechanism is mounted on a gear drive mechanism.

FIG. 18 is an example of a device that drives a driven object by a gear drive mechanism that implements an example of a conventional mechanism.

[Explanation of symbols]

1 inner flange, 2 inner rotor, 3 inner rotor hole, 4 inner flange set screw, 5 outer rotor, 6 outer rotor hole, 7 bearing, 8
Bearing retainer, 9 Bearing retainer set screw, 10
Ball, 11 Spring, 12 Friction Plate, 13 Friction Plate, 14 Spline Claw, 15 Spline Claw, 16
Spline groove, 17 Spline groove, 18 Disc spring, 19 Ring nut, 20 Helical gear, 2
1 Gear Holder, 22 Penetration Part, 23 Rod, 24
Inclined part of rod, 25 taper plate, 26 taper part of taper plate, 27 friction rod, 28 casing, 29 drive source, 30 drive gear, 31 intermediate gear, 32 pinion gear, 33 stopper, 34 sector gear, 35 fixed part, 36 rotating part, 37 driven object.

Claims (4)

[Claims] 1. An inner flange for receiving a torque generated by a drive source such as a motor, an inner rotor fixed to the inner flange for transmitting the torque, a fixture for fixing the inner flange to the inner rotor, and a hole provided in the inner rotor. A ball that is inserted to transmit torque, an outer rotor that receives torque from this ball and transmits torque to the driven object side, a spring that presses the above ball into the hole provided in this outer rotor, a bearing that supports the above outer rotor and inner rotor, and this bearing is fixed In the torque limiting mechanism, which includes a bearing retainer and a fixture for fixing the bearing retainer to the outer rotor, the outer rotor is provided with a spline groove, and a spline claw engaging with the groove is provided. Provided A friction plate, a disc spring that generates a force to press the friction plate against the inner flange,
A torque limiting mechanism comprising a ring nut for fixing the disc spring. 2. An inner flange for receiving a torque generated by a drive source such as a motor, an inner rotor fixed to the inner flange for transmitting the torque, a fixture for fixing the inner flange to the inner rotor, and a hole provided in the inner rotor. A ball that is inserted to transmit torque, an outer rotor that receives torque from this ball and transmits torque to the driven object side, a spring that presses the above ball into the hole provided in this outer rotor, a bearing that supports the above outer rotor and inner rotor, and this bearing is fixed In the torque limiting mechanism that includes a bearing retainer and a fixture that fixes the bearing retainer to the outer rotor, cuts the outer rotor and the inner rotor from gears by engaging the gears with the outer rotor and the inner rotor. For gear efficiency Therefore, the torsion gear that transmits torque,
A torque limiting mechanism comprising: a gear holder for fixing the torsion gear. 3. An inner flange for receiving a torque generated by a drive source such as a motor, an inner rotor fixed to the inner flange for transmitting the torque, a fixture for fixing the inner flange to the inner rotor, and a hole provided in the inner rotor. A ball that is inserted to transmit torque, an outer rotor that receives torque from this ball and transmits torque to the driven object side, a spring that presses the above ball into the hole provided in this outer rotor, a bearing that supports the above outer rotor and inner rotor, and this bearing is fixed In a torque limiting mechanism that includes a bearing retainer and a fixture that secures the bearing retainer to the outer rotor, a torque limiting mechanism that shuts off the torque when excessive torque is transmitted, a through hole is formed in the hole for inserting the spline groove and the ball in the outer rotor. In the hole A rod that is inserted and has a wedge-shaped inclined portion at the tip, a friction plate that has a spline claw that meshes with the spline groove of the inner rotor, and a taper plate that has a tapered portion that meshes with the inclined portion of the rod and presses the friction plate against the bearing retainer. And a torque limiting mechanism. 4. An inner flange for receiving torque generated by a drive source such as a motor, an inner rotor fixed to the inner flange for transmitting torque, a fixture for fixing the inner flange to the inner rotor, and a driven device for receiving torque from the inner rotor. Outer rotor that transmits torque to the object side, balls inserted in holes provided in this outer rotor to transmit torque, springs that press the above balls into the holes provided in the above inner rotor, bearings that support the above outer rotor and inner rotor, this bearing is fixed In the torque limiting mechanism, which comprises a bearing retainer, and a fixture for fixing the bearing retainer to the outer rotor, the through hole is provided in the hole for inserting the ball of the outer rotor in the torque limiting mechanism that shuts off the torque when excessive torque is transmitted, Inserted in that hole A torque limiting mechanism comprising a friction rod having a friction plate at its tip.