JP5791835B1 - Rotary motion transmission device and generator using the same - Google Patents

Abstract

Provided is a rotational motion transmission device that does not transmit rotational motion when it is suddenly rotated at a high speed or the like. A rotary motion transmission device 7 according to the present invention includes a pair of cylinders 13 each having an output shaft 11 and a pair of members disposed opposite to each other across the output shaft so that the cylinder can rotate. The first and second bar magnets 14 and 15 and the operation unit 16 that alternately separates the first and second bar magnets from the cylindrical body as the input shaft 9 rotates are provided on the outer peripheral surface of the cylindrical body. The polarity is set so that an attractive force is applied to both ends of the first and second bar magnets, arranged from the starting point at the midpoint of the axial length toward the opposite ends across the output shaft. The polarity is set so that the repulsive force acting from the both ends of the first and second bar magnets is applied to the plurality of magnets that are arranged on both sides of the outer peripheral surface from the both ends toward the starting point. A plurality of magnets. The cylindrical body is rotated once by the operation unit to transmit the rotational motion of the input shaft to the output shaft. [Selection] Figure 2

Description

  The present invention relates to a rotary motion transmission device that transmits a rotary motion applied to an input shaft to an output shaft, and more particularly to a generator using the rotary motion transmission device.

  Conventionally, when the impeller rotated by wind power, the power generation device that generates power with the rotation of the rotation shaft of the impeller, and the rotation speed of the rotation shaft per unit time exceed the limit value, the power generation device protection Therefore, a generator including a brake mechanism that suppresses the rotational speed of the rotating shaft is known (Patent Document 1).

JP 2014-231765 A

  Even if it has the said brake mechanism, the damage which the impeller is destroyed by the gust and strong wind which generate | occur | produce by generation | occurrence | production of a typhoon or a bomb low pressure has generate | occur | produced.

  The present invention has been made in order to solve the above-described problems of the conventional example, and can be used in a generator or the like. The impeller is a high power applied to a power generator by suddenly rotating at high speed from a stopped state. It is an object of the present invention to provide a rotary motion transmission device that can suppress an excessive load applied to a power generation device when the load and the impeller rotate at a speed higher than an assumed value without using a brake mechanism.

  In order to achieve the above object, the present invention provides a rotary motion transmission device that rotates an output shaft according to rotation of an input shaft, and a cylindrical body having the output shaft, and the cylindrical body is rotatable. As described above, a pair of first and second bar magnets arranged facing each other across the output shaft, and the first and second bar magnets are alternately separated from the cylindrical body as the input shaft rotates. An operation portion, and is arranged on the outer peripheral surface of the cylindrical body from the start point at the midpoint of the axial length toward both ends on the opposite side across the output shaft, A plurality of magnets whose polarity is set so that an attractive force attracted to both ends of the second bar magnet acts, and are arranged from the both ends toward the starting point on the outer peripheral surface where the plurality of magnets are not present, 1. Polarity is set so that repulsive force acting away from both ends of the 2nd bar magnet acts. A plurality of magnets, and the second bar magnet is actuated by the attractive force and the repulsive force while the first bar magnet is separated from the tubular body by the operating portion. The body is rotated halfway in a predetermined direction, and the first bar magnet moves the cylindrical body by the action of the attractive force and the repulsive force while the second bar magnet is separated from the cylindrical body. In this case, the cylindrical body is rotated once to transmit the rotational movement of the input shaft to the output shaft.

  In the rotational motion transmission device according to the present invention, the shafts of the plurality of magnets arranged on the outer peripheral surface are in contact with the outer peripheral surface of the cylindrical body, and have an angle of 30 to 60 degrees with respect to the pair of bar magnets. It is preferable to arrange | position at the angle of between.

  The generator of the present invention includes an impeller rotated by receiving an external force, the input shaft connected to the rotation shaft of the impeller, and any one of the rotational motion transmission devices, And a generator motor connected to the output shaft of the rotary motion transmission device.

  According to the present invention, when the input shaft is suddenly rotated at a high speed from a stopped state, or when the input shaft is rotated at a speed higher than an assumed value, the movement of the pair of bar magnets operated by the operation unit is cylindrical. The body cannot follow and is in a so-called step-out state. That is, the pair of bar magnets and the cylindrical body has a function of automatically canceling transmission of the rotational motion to the output shaft when a high load is suddenly applied. Thereby, in order to suppress the rotational motion transmitted to the output shaft, it is not necessary to decelerate the rotational motion applied to the input shaft, and the input shaft or the impeller connected to the input shaft can be prevented from being broken. .

(A) is a perspective view of the generator provided with the rotational motion transmission apparatus of this invention, (b) is a block diagram of the said generator. It is a disassembled perspective view which shows the structure of the rotational motion transmission apparatus, and is a perspective view which shows the state which has a pair of bar magnet in the position which pinches | interposes a cylindrical body with the operation part of the rotational motion transmission apparatus. The perspective view which shows the state which has one bar magnet in the position away from the cylindrical body by the operation part of the rotational motion transmission apparatus. The perspective view which shows the state which has a pair of bar magnet in the position which pinches | interposes a cylindrical body with the operation part of the rotational motion transmission apparatus. The perspective view which shows the state in which the other bar magnet exists in the position away from the cylindrical body by the operation part of the rotational motion transmission apparatus. The expanded view which expanded and represented the outer peripheral surface of the cylindrical body in order to demonstrate the state of the several magnet currently embedded at the outer peripheral surface of the cylindrical body. (A) is a top view showing an attractive force acting between a plurality of magnets embedded in the outer peripheral surface of the cylindrical body and the other bar magnet when one bar magnet is pulled away from the cylindrical body, (b) ) Is a bottom view of the state of (a) as viewed from below, and (c) and (d) are side views of the cylindrical body and the pair of bar magnets shown in (a) as viewed from the direction of arrow C. FIG. (A) is a top view showing an attractive force acting between a plurality of magnets embedded in the outer peripheral surface of the cylindrical body and the other bar magnet when the other bar magnet is pulled away from the cylindrical body; (A) is the bottom view which looked at the state of (a) from the lower side, (c) (d) is the side view which looked at the cylindrical body and a pair of bar magnet which are shown to (a) from the arrow E direction.

The present invention relates to an output connected to a power generation motor in response to rotation of an input shaft connected to an impeller that rotates with an external force caused by a fluid such as water (river water, seawater), wind, steam, air, and particulate matter. A rotary motion transmission device for rotating a shaft, a cylindrical body having the output shaft, and a pair of first and second members disposed facing each other across the output shaft so that the cylindrical body can rotate. A second bar magnet; and an operation unit that alternately separates the first and second bar magnets from the cylindrical body as the input shaft rotates. On the outer peripheral surface of the cylindrical body, they are arranged from the starting point at the midpoint of the axial length toward both ends on the opposite side across the output shaft, and are drawn toward both ends of the first and second bar magnets. A plurality of magnets whose polarities are set so that an attractive force acts, and the outer peripheral surface are arranged from the both ends toward the starting point on the side where the plurality of magnets are absent, and from both ends of the first and second bar magnets And a plurality of magnets whose polarities are set so that a repulsive force to be separated acts. While the first bar magnet is separated from the cylindrical body by the operation unit, the second bar magnet causes the cylindrical body to rotate halfway in a predetermined direction by the action of the attractive force and the repulsive force, While the two-bar magnet is separated from the cylindrical body, the first bar magnet repeats the operation of rotating the cylindrical body half-turning in the predetermined direction by the action of the attractive force and the repulsive force, thereby the cylindrical shape. The body is rotated once to transmit the rotational motion of the input shaft to the output shaft.
The rotational motion transmission device adopting this configuration is a pair of bar magnets operated by the operation unit when the input shaft is suddenly rotated at a high speed from a stopped state or when the input shaft is rotated at a speed higher than an expected value. The cylindrical body cannot follow the movement, and is in a so-called step-out state. That is, the pair of bar magnets and the cylindrical body has a function of automatically canceling transmission of the rotational motion to the output shaft when a high load is suddenly applied. This eliminates the need to suppress the rotational motion applied to the input shaft and prevents the input shaft and the impeller connected to the input shaft from being broken.

  A wind power generator using a rotary motion transmission device according to an embodiment of the present invention will be described. The wind power generator 1 shown in FIG. 1A has an impeller 2 that rotates by receiving wind power as an external force, and an input shaft that is connected to the rotation shaft of the impeller 2. The power generation unit 3 is configured to include a power generation unit 3 and a support column 4 that supports the power generation unit 3. The electricity generated by the power generation unit 3 is output to a device (not shown) that requires electricity through the support column 4, the control unit 5 including a transformer, and the electric wire 6.

  As shown in FIG. 1B, the power generation unit 3 includes a rotational motion transmission device 7 and a power generation motor 8 connected to the output shaft of the rotational motion transmission device 7. A face gear 10 is attached to the distal end of the input shaft 9 of the rotary motion transmitting device 7, and the face gear 10 meshes with a spur gear 2 b attached to the distal end of the rotating shaft 2 a of the impeller 2. A spur gear 11 a is attached to the tip of the output shaft 11 of the rotary motion transmission device 7, and the spur gear 11 a meshes with a spur gear 8 b attached to the tip of the rotating shaft 8 a of the generator motor 8.

  As shown in FIG. 2, the rotational motion transmission device 7 includes a rectangular parallelepiped main body 12 configured by rectangular side walls 12 a, 12 b, 12 c, and 12 d. A hole 12e for the output shaft 11 is provided in the side wall 12b. The configuration of the side wall 12b is the same as the configuration of the side wall 12a, and illustration and overlapping description are omitted. Inside the main body 12, a cylindrical body 13 having an output shaft 11 and a pair of bar magnets 14, 15 arranged facing each other across the output shaft 11 so that the cylindrical body 13 can rotate. (First and second bar magnets) and an operation unit 16 that alternately separates the bar magnets 14 and 15 from the cylindrical body 13 as the input shaft 9 rotates. A plurality of magnets are embedded in the outer peripheral surface of the cylindrical body 13 (see FIG. 6).

The bar magnets 14 and 15 are in contact with the cylindrical body 13 or are arranged at positions close to the cylindrical body 13 and are slidably movable from the arranged position to a position separated in the horizontal direction in the figure. It is attached to 12b. Specifically, the bar magnets 14 and 15 are in a roller shape, and are rotatably attached to plates 14b and 15b accommodated in the rectangular frames 14a and 15a so as to be slidable within the frames. The bar magnets 14 and 15 are in contact with the cylindrical body 13 by the action of springs 14c and 15c, one end of which is attached to the frames 14a and 15a and the other end is attached to the plates 14b and 15b. Be placed. In the present specification, the proximity position refers to a position where a magnetic force necessary to rotate the cylindrical body 13 from the bar magnets 14 and 15 is applied, a position that is not in contact with the cylindrical body 13, preferably a position that is substantially in contact with the cylindrical body 13. means. This is because the cylindrical body 13 can rotate most easily and can receive the magnetic force of the bar magnets 14 and 15 most strongly.

  In order for the magnetic forces of the bar magnets 14 and 15 to efficiently act on the plurality of magnets embedded in the outer peripheral surface of the cylindrical body 13, the bar magnets 14 and 15 are preferably in contact with the cylindrical body 13. The bar magnets 14 and 15 have a roller shape that can rotate on an axis parallel to the output shaft for the purpose of reducing dynamic frictional resistance when contacting the cylindrical body 13. Even if the bar magnets 14 and 15 have a roller shape, if the bar magnets 14 and 15 are strongly pressed against the cylindrical body 13, the friction when the cylindrical body 13 tries to rotate increases. When the springs 14c and 15c that press the bar magnets 14 and 15 are strong, the positions at which the bar magnets 14 and 15 can approach the cylindrical body 13 are limited, and are disposed at close positions, for example, about 0 to 0.5 mm apart. In addition, when using the cylindrical or square pillar-shaped thing which does not rotate for the bar magnets 14 and 15, the cylindrical body 13 can be rotated by the magnetic force from the bar magnets 14 and 15 without preventing the rotation of the cylindrical body 13. As long as the condition is satisfied, the bar magnets 14 and 15 are arranged at a proximity position away from the cylindrical body 13, for example, at a proximity position about 0.1 mm to 1 mm apart.

The operation unit 16 includes a cam 16a that rotates as the input shaft 9 rotates, and a lever that slides the bar magnet 14 or the bar magnet 15 to a position away from the cylindrical body 13 when the cam 16a abuts and presses. 14d, 15d. In this figure, levers 14d and 15d are connected to levers 14e and 15e provided on the side wall 12b. In FIG. 2, the cam 16 a does not hit any of the levers 14 e and 15 e, and as a result, the bar magnets 14 and 15 are in contact with the cylindrical body 13 or are disposed in the vicinity thereof.

  As shown in FIG. 3, when the input shaft 9 rotates, the cam 16 a comes into contact with the lever 14 d and pulls the bar magnet 14 away from the cylindrical body 13. The position at which the lever 14 d is pulled away reduces the attractive force due to the magnetic force exerted by the bar magnet 14 on the plurality of magnets embedded in the outer peripheral surface of the cylindrical body 13, and the cylindrical body 13 is attracted by the magnetic force from the bar magnet 15. And it should just be a position away from the position which starts rotation operation according to repulsive force.

  The strength of the springs 14c and 15c and the strength of the bar magnets 14 and 15 are set according to the magnitude of the force for rotating the input shaft 9. That is, the force that the cam 16a pushes the lever 14d by the force (assumed value) that rotates the input shaft 9 in FIG. 3, the force that the spring 14c presses the bar magnet 14 against the cylindrical body 13, and the bar magnet 14 that is the cylindrical body. The strength of the springs 14 c and 15 c and the strength of the magnetic force of the bar magnets 14 and 15 are set so as to be stronger than the total force of the force attracting the plurality of magnets embedded in 13. Further, the strength of the springs 14c and 15c is such that the bar magnets 14 and 15 are in contact with the cylindrical body 13 against the repulsive force that the bar magnets 14 and 15 receive from a plurality of magnets embedded in the cylindrical body 13, or It is also necessary for the strength to be arranged in the proximity position.

  As shown in FIG. 4, when the input shaft 9 rotates, the cam 16a is again in a position where it does not hit the levers 14d and 15d, and both the bar magnets 14 and 15 are in contact with the cylindrical body 13 or arranged in the proximity positions thereof. Is done.

  As shown in FIG. 5, when the input shaft 9 further rotates, the cam 16 a comes into contact with the lever 15 d and pulls the bar magnet 15 away from the cylindrical body 13. The position at which the lever 15d is pulled away reduces the attractive force due to the magnetic force exerted on the plurality of magnets embedded in the outer peripheral surface of the cylindrical body 13 by the bar magnet 15 and the attractive force due to the magnetic force from the bar magnet 14 is reduced. Accordingly, the position may be a position away from the position where the rotation operation is started.

  FIG. 6 is a development view for explaining the state of the plurality of magnets 17 a to 17 d embedded in the outer peripheral surface 13 a of the cylindrical body 13. On the outer peripheral surface 13 a of the cylindrical body 13, the rod magnet 14 is arranged from the starting point P1 at the midpoint of the length in the direction of the output shaft 11 toward both ends P2 and P3 on the opposite side across the output shaft. , 15 are provided with a plurality of magnets 17a, 17b whose polarities (N pole, S pole) are set as shown in the figure so that an attractive force attracted to both ends acts. Further, the outer peripheral surface 13a is subjected to a repulsive force that is arranged from both ends P2 and P3 toward the starting point P1 on the side where the plurality of magnets 17a and 17b of the outer peripheral surface 13a are not present, and tries to separate from both ends of the bar magnets 14 and 15. In this way, a plurality of magnets 17c and 17d whose polarities are set as shown in the figure are included.

  The plurality of magnets 17a to 17d are short columnar bar magnets, and a pair of bar magnets 14 in a direction in which the axes of the plurality of magnets arranged on the outer peripheral surface are in contact with the outer peripheral surface 13a of the cylindrical body 13; An angle α between 30 degrees and 60 degrees with respect to 15, preferably α = 45 degrees as shown. The cylindrical body 13 rotates more smoothly than the case where the columnar bar magnets 17a to 17d are embedded so that the axis thereof is oriented in the direction perpendicular to the outer peripheral surface 13a (the front and back directions in the developed view shown in this figure). Thus, an experimental result has been obtained that the followability of the cylindrical body 13 accompanying the rotation of the cam 16a is good.

  The bar magnets 14 and 15 have the strongest magnetic force S or N at both ends, and the magnetic force at the intermediate position is weaker than at both ends. For example, consider a case where a plurality of magnets 17a to 17d are arranged on a flat plate as shown in the development view of FIG. In this case, when a bar magnet 18 as shown (same as the bar magnets 14 and 15) is rolled in the direction of the arrow A, the magnets 17c and 17d act to attract both ends of the bar magnet 18 so that the bar magnet 18 Is quickly moved in the direction of arrow A. The magnets 17a and 17b apply a repulsive force to the bar magnet 18 at positions near the positions P2 and P3. As a result, the bar magnet 18 stops at a position where the attractive force and the repulsive force are balanced, in the vicinity of the positions P2 and P3.

  In the rotary motion transmission device 7 having the above-described configuration, the cylinder when the input shaft 9 rotates and the cams 16a alternately contact the levers 14d and 15d and the bar magnets 14 and 15 are alternately separated from the cylindrical body 13 is performed. A state of rotation of the body 13 will be described.

  First, in the state of FIG. 2, that is, when the apparatus 7 is viewed from above, a plurality of magnets 17a to 17d embedded in the cylindrical body 13 are arranged as shown in FIGS. 7 (a) and 7 (b). Think about the case. In this case, as shown in FIG. 3, that is, as shown in FIG. 7A, when the bar magnet 14 is separated in the arrow B direction indicated by a thick line, a plurality of embedded in the outer peripheral surface 13 a of the cylindrical body 13. An attractive force attracted to the bar magnet 15 acts on the magnets 17c and 17d, and a repulsive force to move away from the bar magnet 15 acts on the magnets 17a and 17b. As a result, as shown in FIGS. 7C and 7D, the cylindrical body 13 is subjected to a force to rotate in the clockwise direction when viewed from the arrow C direction, and the positions P2 and P3 of the outer peripheral surface 13a are the rods. It comes to a position near the magnet 15. In this way, the operation unit 16 is configured so that the bar magnet 15 moves the cylindrical body 13 in a predetermined direction by the action of the attractive force and the repulsive force while the bar magnet 14 is separated from the cylindrical body 13 (clockwise when viewed from the arrow C direction). The cylindrical body 13 is rotated halfway in the direction of rotation.

  Next, the state shown in FIG. 4, that is, when the device 7 is viewed from above, a plurality of magnets 17 a to 17 d embedded in the cylindrical body 13 are arranged as shown in FIGS. 8A and 8B. Think if you are. In this case, as shown in FIG. 5, that is, as shown in FIG. 8A, when the bar magnet 15 is pulled away in the direction of arrow D indicated by a thick line, a plurality of embedded in the outer peripheral surface 13 a of the cylindrical body 13. An attractive force attracted to the bar magnet 14 acts on the magnets 17c and 17d, and a repulsive force acting away from the bar magnet 14 acts on the plurality of magnets 17a and 17b. As a result, as shown in FIGS. 8C and 8D, the cylindrical body 13 is subjected to a force to rotate in the clockwise direction when viewed from the direction of the arrow E, and the positions P2 and P3 of the outer peripheral surface 13a are the rods. It comes to a position near the magnet 14. As described above, the operation unit 16 is configured so that, while the bar magnet 15 is separated from the cylindrical body 13, the bar magnet 14 moves the cylindrical body 13 in a predetermined direction by the action of the attractive force and the repulsive force. The cylindrical body 13 is rotated halfway in the direction of rotation. As a result, the cylindrical body 13 and its output shaft 11 rotate once according to one rotation of the input shaft 9.

  As described above, the operation unit 16 repeats the operation of alternately pulling the bar magnets 14 and 15 away from the cylindrical body 13 as the input shaft 9 rotates, thereby changing the rotational motion of the input shaft 9 to the output shaft 11. To communicate. The rotary motion transmission device 7 rotates the output shaft 11 in one predetermined direction regardless of the rotation direction of the input shaft 9.

As described above, the cylindrical body 13 rotates in one predetermined direction with the rotation of the input shaft 9, but reverse rotation prevention means is provided on the output shaft 11 of the cylindrical body 13 for the purpose of more stable rotation. For example, a ratchet mechanism may be provided.

  When the input shaft 9 is suddenly rotated at a high speed from a stopped state, or when the input shaft 9 is rotated at a speed higher than an assumed value, the rotational motion transmission device 7 having the above-described configuration is operated as a pair of operations. The cylindrical body 13 cannot follow the movement of the bar magnets 14 and 15, and is in a so-called step-out state. That is, the pair of bar magnets 14 and 15 and the cylindrical body 13 have a function of automatically canceling transmission of rotational motion to the output shaft 11 when a high load is suddenly applied. Thereby, in order to suppress the rotational motion transmitted to the output shaft 11, it is not necessary to decelerate the rotational motion applied to the input shaft 9, for example, it is necessary to provide a brake mechanism, and the input shaft 9 or the input shaft 9 is connected. It is possible to prevent the impeller 2 from being broken.

  The present invention is not limited to the configuration of the above embodiment, and various modifications are possible without departing from the spirit of the invention, such as reversing the polarity of the magnet. For example, the shape of the cam 16a is not limited to the illustrated one, and a cam having a rotating roller at the tip may be used. In this case, friction with the levers 14d and 15d is reduced, and a smoother rotational motion can be transmitted.

  Furthermore, the bar magnets 14 and 15 are arranged at positions close to the cylindrical body 13 by the force of the springs 14c and 15c, but are not limited to this, and are arranged at positions near the cylindrical body 13 by the pulling force of rubber. You may do it.

  The rotational motion transmission device of the present invention is not limited to a wind power generator, but a generator that rotates an impeller by the flow of a river, a generator that rotates the impeller by the force of a wave and a wave that strikes the coast, and a vertical movement of the wave It can be used for a wave power generator that rotates an impeller using Further, in the engine-type generator, a configuration in which the output shaft of the internal combustion engine and the input shaft of the rotary motion transmission device are coupled and the output shaft of the rotary motion transmission device is connected to the generator motor may be employed. Furthermore, not only the generator, but also a rotational motion transmission function that automatically cancels the transmission of rotational motion to the output shaft when sudden sudden rotation or unexpected high-speed rotation occurs as an undesirable event. It can generally be used as a device.

DESCRIPTION OF SYMBOLS 1 Generator 2 Impeller 2a Rotating shaft 2b, 8b, 11a Spur gear 3 Power generation part 4 Support | pillar 5 Control part 6 Electric wire 7 Rotation motion transmission device 8 Generator motor 8a Rotating shaft 9 Input shaft 10 Face gear 11 Output shaft 12 Main body 13 Tube 14 and 15 Bar magnets (first and second bar magnets)
14a, 15a Frames 14b, 15b Plates 14c, 15c Springs 14d, 14e, 15d, 15e Lever 16 Operation part 16a Cams 17a, 17b, 17c, 17d Multiple magnets 18 Bar magnets P1 Starting positions P2, P3 Positions at both ends

Claims (3)

In the rotational motion transmission device that rotates the output shaft according to the rotation of the input shaft,
A cylindrical body having the output shaft;
A pair of first and second bar magnets arranged facing each other across the output shaft so that the cylindrical body is rotatable;
An operation unit that alternately separates the first and second bar magnets from the cylindrical body as the input shaft rotates.
On the outer peripheral surface of the cylindrical body, they are arranged from the starting point at the midpoint of the axial length toward both ends on the opposite side across the output shaft, and are drawn toward both ends of the first and second bar magnets. A plurality of magnets whose polarities are set so that an attractive force acts, and the outer peripheral surface are arranged from the both ends toward the starting point on the side where the plurality of magnets are absent, and from both ends of the first and second bar magnets And having a plurality of magnets whose polarities are set so that repulsive force to be separated acts,
While the first bar magnet is separated from the cylindrical body by the operation unit, the second bar magnet causes the cylindrical body to rotate halfway in a predetermined direction by the action of the attractive force and the repulsive force, While the two-bar magnet is separated from the cylindrical body, the first bar magnet repeats the operation of rotating the cylindrical body half-turning in the predetermined direction by the action of the attractive force and the repulsive force, thereby the cylindrical shape. A rotational motion transmitting device, wherein the rotational motion of the input shaft is transmitted to the output shaft by rotating the body once. The shafts of the plurality of magnets arranged on the outer peripheral surface are arranged at an angle between 30 degrees and 60 degrees with respect to the pair of bar magnets in a direction in contact with the outer peripheral surface of the cylindrical body. Item 2. The rotational motion transmission device according to Item 1. An impeller rotated by external force,
The rotary motion transmission device according to claim 1 or 2, comprising the input shaft connected to a rotation shaft of the impeller.
A generator motor connected to the output shaft of the rotary motion transmission device.