JPH0681921A - Rotary driving device - Google Patents

Abstract

PURPOSE:To convert rotational displacement of a rotary moving body to rotational motion by utilizing a rotatably arranged driven pulley, and a transmission belt laid on the driven pulley 1, extracting rotational motion from reciprocating motion, while attaining torque transmission to the driven pulley and positioning of the driven pulley with a simple structure. CONSTITUTION:A driven pulley 1 is rotatably arranged. A transmission belt 3 is laid around the driven pulley 1. A belt driving means at least reciprocably moves the transmission belt 3 in a longitudinal direction of the belt. A first tensioner 4 pushes one side span 3a located on the transmission belt 3, between the driven pulley 1 and the belt driving means with a specified pushing force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel rotary drive device which takes out rotary motion from reciprocating motion by using a transmission belt.

[0002]

2. Description of the Related Art For example, in an output shaft of a diesel cycle engine or the like, due to an explosion in a combustion chamber of the engine,
It is known that a rotational fluctuation that vibrates in the rotational direction occurs. Therefore, the inventor of the present invention considered utilizing the energy of the rotation fluctuation generated in such a rotating body for the rotating movement.

Generally, as a conventional mechanism capable of extracting a rotary motion from a reciprocating motion, for example, a clutch mechanism or a one-way clutch is used, and only one direction motion of the reciprocating motion is taken out as a rotary motion. Things are known. Therefore, if such a mechanism is attached to the output shaft, the rotational fluctuation can be converted into rotational movement.

[0004]

However, it must be said that the above-mentioned conventional mechanism has a complicated structure due to the following reasons and is difficult to put into practical use.

That is, in the case of using the above-mentioned clutch mechanism, a mechanism for turning on and off the clutch in synchronism with the reciprocating motion is separately required, and the mechanism is complicated. Also, energy such as electric power must be used for the on / off operation of the clutch.

On the other hand, in the case of using the one-way clutch, a large impact is applied to the one-way clutch each time the reciprocating motion is performed, and a large clutch having a high load capacity must be used.

The present invention has been made in view of the above points, and an object thereof is to make a reciprocating motion using a driven pulley rotatably provided and a transmission belt wound around the driven pulley. That is, the rotational movement can be taken out from the shaft, and torque transmission to the driven pulley and positioning of the driven pulley can be realized by a simple mechanism.

[0008]

In order to achieve the above object, according to the present invention, the transmission belt is reciprocated in the longitudinal direction, and in one of the movements, a slight slippage occurs between the transmission belt and the driven pulley. Then, the reciprocating motion of the transmission belt is converted into the rotary motion of the driven pulley by utilizing this.

Specifically, in the invention of claim 1, the driven pulley rotatably provided, the transmission belt wound around the driven pulley, and the transmission belt reciprocate at least in the belt length direction. The belt drive means and a first tensioner for pressing a span on one side located between the driven pulley of the transmission belt and the belt drive means with a predetermined pressing force.

In the invention of claim 2, the above-mentioned claim 1 is adopted.
In the invention, the second tensioner for pressing the span on the other side located between the driven pulley of the transmission belt and the belt driving means with a predetermined pressing force is provided. Then, the first and second tensioners are configured to operate selectively.

According to the invention of claim 3, the above-mentioned claim 1 is adopted.
Alternatively, in the second invention, the transmission belt is an end belt. Then, the belt driving means, a swing member that is fastened to both ends of the end belt and is swingable so as to alternately pull each end with respect to the driven pulley, and the swing member. And a swing means.

According to the invention of claim 4, the above-mentioned claim 1 is adopted.
Alternatively, in the second invention, the transmission belt is an endless belt. The belt driving means is configured to have a rotatably provided driving pulley and a swinging means for reciprocally rotating the driving pulley about a rotation axis, and the endless belt includes a driven pulley and a driving pulley. Wrap it in between.

Further, in the invention of claim 5, in the invention of claim 1, 2, 3 or 4, the tensioner is capable of abutting against the transmission belt, and the contacting member abuts against the transmission belt. And a biasing means for biasing the biasing direction. The biasing force of the biasing means is variable.

[0014]

According to the invention of claim 1, the belt drive means
The transmission belt is driven so as to reciprocate in the lengthwise direction, and the span of the pair of spans located between the driven pulley of the transmission belt and the belt driving means is the one on the side receiving the pressure from the first tensioner. When the tension side span is pulled by the driving means, the opposite side span becomes the slack side span. At this time, torque is generated from the belt to the driven pulley and a force that increases the tension is applied in the tension side span, but the first tensioner decreases the tension in response to this increase in tension. Therefore, the degree of increase in tension in the tension side span is reduced.
Therefore, in the slack side span, the tension will decrease excessively by the small amount of change in tension in the tension side span,
A situation occurs in which the tension of the transmission belt is very weak or the tension is lost. That is, the driven pulley cannot receive the torque because the tension of the transmission belt is too low, and slippage occurs with the belt. As a result, of the reciprocating motions of the transmission belt in the longitudinal direction, when the transmission belt is displaced to the side receiving the pressing operation of the first tensioner, the driven pulley is hardly driven to rotate.

On the other hand, when the span opposite to the pressing side of the pair of spans of the transmission belt is the tension side span pulled by the belt driving means, the pressing side span is the slack side span. Becomes At this time, torque is generated from the belt to the driven pulley, and the tension increases due to being pulled in the tension side span, and on the contrary, the tension tends to decrease in the slack side span in proportion to the increase in tension. However, since the first tensioner operates so as to increase the tension in response to the decrease in the tension, the degree of the decrease in the tension in the loose side span becomes small. Therefore, in the tension side span, the tension increases excessively because the change amount of the tension in the slack side span is small. That is, since the tension is high in both spans of the belt, slippage between the belt and the driven pulley due to the torque is unlikely to occur. As a result, of the reciprocating motions of the transmission belt in the longitudinal direction, when the transmission belt is displaced to the side where the first tensioner is not pressed, the driven pulley is rotationally driven in the same displacement direction.

From the above, the driven pulley receives the movement of the reciprocating movement in the lengthwise direction of the transmission belt in the direction in which the tensioner is not pressed, and is rotationally driven only in the same displacement direction. Will be. In this case, the peripheral speed of the driven pulley can be changed by changing the reciprocating frequency of the belt or the amount of displacement of the reciprocating motion.

Further, in the invention of claim 2, only the first tensioner for pressing the span on one side located between the driven pulley of the transmission belt and the belt drive means operates, and the span on the other side is actuated. When the reciprocating movement in the direction in which the belt is wound is performed with the operation of the pressing second tensioner stopped, the driven pulley moves in the direction in which the belt is displaced to the side where the pressing operation by the first tensioner is not received. In response to the movement, it is rotationally driven only in the same displacement direction. Conversely, the first
In the state where the tensioner stops operating and only the second tensioner operates, the driven pulley receives the movement in the direction in which the belt is displaced to the side that is not pressed by the second tensioner, and the driven pulley is rotated in the same displacement direction, that is, the rotation. It is driven to rotate in the direction opposite to the direction. Therefore, the rotation direction of the driven pulley can be easily switched.

Further, according to the third aspect of the invention, when the rocking member is rocked by the rocking means, each end of the end belt fixed to the rocking member is alternately arranged with respect to the driven pulley. By being pulled, the belt is given a reciprocating motion in the belt length direction.

Further, in the invention of claim 4, when the driving pulley is reciprocally rotated about the rotation axis by the swinging means, the endless belt wound around the pulley and the driven pulley is A reciprocating motion is given in the belt length direction.
At this time, if the driving pulley is given a rotational motion in the same direction as the driven pulley due to the reciprocating rotation of the driving pulley, the rotation speed of the driven pulley is the same as the reciprocating rotation of the driving pulley. By adding the motion, the speed is increased more than the speed due to the rotational movement of the driving pulley.

Further, according to the invention of claim 5, the amount of slip between the belt and the driven pulley is changed by changing the urging force of the urging means and changing the pressing force of the contact member against the transmission belt. Since the displacement of the driven pulley changes,
Even when the displacement amount of the reciprocating motion of the transmission belt and the reciprocating cycle are constant, by adjusting the urging force,
The peripheral speed of the driven pulley is provided with a speed change function of increasing, decreasing, or stopping the peripheral speed. Therefore,
When the urging force is continuously variable, the driven pulley is continuously variable.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIGS. 1 to 3 show a rotary drive device according to a first embodiment of the present invention, which is rotatable about horizontal rotary shafts 1a and 2a which are vertically spaced from each other. A driven pulley 1 having the same diameter and made up of supported V pulleys
And a drive pulley 2 and a transmission belt 3 which is an endless V-belt belt wound between the pulleys 1 and 2. Of the pair of spans 3a and 3b located between the pulleys 1 and 2 of the belt 3, a spanner 3a on the left side of the drawing has a tensioner 4 (first tensioner 4) that operates to press the span 3a with a predetermined pressing force. A tensioner) is provided.

The tensioner 4 includes a fixed body 7 and a rotary shaft 1
a and 2b, and an L-shaped arm 5 rotatably supported via a support shaft 5a parallel to the a and 2b, and rotary shafts 1a and 2 at the tip of the arm 5.
A tension pulley 6 as a contact member rotatably supported around an axis parallel to b, and a tension coil as a biasing means extended between the base end of the L-shaped arm 5 and the fixed body 7. The tension belt 6 is provided with a spring 8 and the tension pulley 6 is moved by the tension force as the biasing force of the coil spring 8.
Is configured to press the back surface of the left span 3a with a constant pressing force. Although not shown, the attachment portion of the tension coil spring 8 to the fixed body 7 is configured to be movable in the length direction of the spring 8, for example, and the tension force of the coil spring 8 is changed by moving the attachment portion. As a result, the pressing force of the tension pulley 6 on the transmission belt 3 can be adjusted.

As shown in FIG. 3, a swing arm 9 which is swingable about a rotary shaft 2a of the pulley 2 is integrally attached to the side surface of the driving pulley 2. A long hole 9a that is long in the arm length direction is provided at the swing end of the swing arm 9. On the other hand, the fixed body 7 near the driving pulley 2 is provided with a driving machine 10 as a swinging means for reciprocally vibrating the driving pulley 2 in the circumferential direction. The prime mover 10 has an output rod 10a that linearly moves back and forth in an axial direction (upward and downward direction in the drawing) substantially orthogonal to the arm 9, and a long hole 9a of the arm 9 is provided at the tip of the rod 10a. An engaging portion 10b that slidably engages with is provided. As a result, when the prime mover 10 moves the rod 10a forward and backward in the axial direction, the swing arm 9 swings within a predetermined angular range, the drive pulley 2 reciprocally vibrates in the circumferential direction, and the transmission belt 3
Is reciprocally oscillated in the belt length direction. The drive pulley 2 and the prime mover 10 constitute the belt driving means R in the present invention.

Next, the operation of the rotary drive device constructed as described above will be described. FIG. 1 shows a state in which the driving pulley 2 is displaced counterclockwise (direction indicated by an arrow in the figure). At this time, since the span 3a on the left side of the transmission belt 3 in the drawing is on the tension side, a force that increases the tension is generated, but the tension pulley 6 decreases the pressing force in response to the increase in the tension of the span 3a. Since it moves to the left (in the same figure), the amount of change in the tension of the left span 3a becomes small. As a result, the right side span 3b on the loose side of the transmission belt 3
Then, the amount of change in the tension of the left span 3b is small, so that the tension is excessively reduced to support the torque of the driving pulley 2, resulting in a state in which the tension is extremely weak or the tension disappears. Therefore, one of the driving pulley 2 and the driven pulley 1 cannot support the torque because the tension of the right span 3b is too low, and slippage occurs with the belt 3. Due to such slippage, the displacement amount of the outer periphery of the driven pulley 1 becomes zero or becomes smaller than the displacement amount of the outer periphery of the driving pulley 2.

FIG. 2 shows a state in which the driving pulley 2 is displaced in the clockwise direction (the direction shown by the arrow in the figure). At this time, the span 3b on the right side of the transmission belt 3 in FIG. On the contrary, since the left span 3a of the transmission belt 3 is on the loose side, the tension is reduced. This left span 3a is a tensioner 4
If it is not actuated, the tension should decrease as the tension of the right span 3b increases. However, as the tension of the left span 3a decreases, the tension pulley 6 moves in the direction of pressing the transmission belt 3 (to the right in the figure), so the amount of change in the tension of the left span 3a decreases. As a result, in the right span 3b, the pulleys 1, 2
Tension will be increased extra to support the torque between and. Therefore, although torque is generated between the pulleys 1 and 2 and the belt 3, the belt 3 does not slip with respect to the pulleys 1 and 2 because the tension is high in any of the spans 3a and 3b. As a result, the driven pulley 1 is
As with the drive pulley 2, the drive pulley 2 is displaced in the clockwise direction by the same displacement amount as the drive pulley 2.

As described above, when the driving pulley 2 is vibratingly displaced so as to reciprocate between the clockwise direction and the counterclockwise direction, the amount of displacement of the driven pulley 1 in the clockwise direction is counterclockwise. Is larger than the displacement amount at
The driven pulley 1 is rotationally driven in the clockwise direction. That is, the driven pulley 1 performs only reciprocating vibration in the circumferential direction and does not perform rotational movement, but the driven pulley 1 performs rotational movement.

The tensioner 4 suppresses an increase in tension when the span 3a of the transmission belt 3 on the side where the tensioner 4 is pressed is on the tension side, and a tension decrease when the span 3a is on the slack side. As described above, the rotational movement can be taken out from the reciprocating vibration of the driving pulley 2, but the operation of such a tensioner 4 is brought about by the urging force of the tension coil spring 8 and is specially provided in addition to the belt driving means R. No drive energy is required. Moreover, the above-mentioned operation of the tensioner 4 occurs in response to the change in the tension of the transmission belt 3 accompanying the reciprocating vibration of the driving pulley 2, and it is special to keep the reciprocating vibration and the operation of the tensioner 4 synchronized. No mechanism is required.

When the driving pulley 2 is displaced counterclockwise (FIG. 1) in the clockwise direction (FIG. 2), an impact is generated between the driving pulley 2 and the driven pulley 1 and the transmission belt 3. However, this impact causes a change in tension of the transmission belt 3 due to the tensioner 4 and the transmission belt 3 and the pulleys 1, 2.
Since it is gradually absorbed by the sliding friction between the two, it can be suppressed relatively gently.

Further, in the above drive device, the reciprocating frequency of the driving pulley 2 is changed by changing the advancing / retreating cycle of the rod 10a of the prime mover 10, the advancing / retreating stroke of the rod 10a, the arm length of the rotating arm 9 and the like. By changing the angular displacement amount of the driving pulley 2 instead,
The rotation speed of can be changed. Generally, the rotational speed of the driven pulley 1 can be increased by increasing the angular velocity of the driving pulley 2.

In the above drive device, the tension force of the tension coil spring 8 of the tensioner 4 is changed to change the tension pulley 6
By adjusting the pressing force on the transmission belt 3 of
The amount of slippage between the driven pulley 1 or the driving pulley 2 and the transmission belt 3 can be changed, so that the rotational speed of the driven pulley 1 can be changed or the driven pulley 1 can be driven while the angular displacement and the frequency of the driving pulley 1 are constant. It is possible to provide a gear shifting function capable of stopping the rotation of the pulley 1.

When the driving pulley 2 only reciprocally vibrates in the circumferential direction but does not rotate like the above embodiment, the portion where the transmission belt 3 of the driving pulley 2 is not wound (Figs. 1 to 1). 3) may be omitted. Further, the side surface does not have to be a perfect circle, and even a shape such as an ellipse can be adopted as long as it does not damage the belt 3. Further, in this case, the transmission belt 3 may be fixed to the driving pulley 2, and thus the transmission belt 3 may be an end belt.

Further, as in the modified example of the belt driving means R shown in FIG. 4, instead of the driving pulley 2, the swing shaft 11 is used.
A swinging arm 11 (swinging member) swingable about a is swung by the prime mover 10, and both ends of the endless transmission belt 3 are positioned at both sides of the swinging shaft 11a of the swinging arm 11. You may make it fasten to. At one end of the swing arm 11, a long hole 11b that engages with the engaging portion 10b provided at the upper end of the rod 10a of the prime mover 10 in the same manner as the swing arm 9 is provided.

Further, as the biasing means of the tensioner 4, instead of the tension coil spring, another type of spring such as a compression spring or a torsion spring may be used. FIG. 5 shows a modification of the tensioner 4 in this embodiment. As a biasing means, a hydraulic cylinder 12 is provided instead of the tension coil spring 8, and the L-shaped arm 5 is driven by the hydraulic pressure as the biasing force of the hydraulic cylinder 12. The tension pulley 6 presses the transmission belt 3 via the tension pulley 6. Further, FIG. 6 shows another modified example of the tensioner 4, in which the L-shaped arm 5 of the modified example is omitted and the tension pulley 6 directly presses the belt 3 by the hydraulic cylinder 12. In each modification, the pressing force of the tension pulley 6 against the transmission belt 3 can be changed by adjusting the hydraulic pressure of the hydraulic cylinder 12. In each modification, a pneumatic cylinder may be used instead of the hydraulic cylinder,
Further, a hydraulic pressure generator using a liquid as a working medium, an atmospheric pressure generator using a gas as a working medium, or the like may be used.

(Second Embodiment) FIG. 7 shows a second embodiment according to the present invention, and the same parts as those in the first embodiment are designated by the same reference numerals. In the rotary drive device according to this embodiment, of the pair of spans 3a and 3b located between the pulleys 1 and 2 of the transmission belt 3 which is an endless belt, the span 3a on the left side in the figure is pressed with a predetermined pressing force. Tensioner 4 working like
In addition to the (first tensioner), a tensioner 4 that operates so as to press the span 3b on the right side of the drawing with a predetermined pressing force.
(Second tensioner). This tensioner 4,
Although not shown in the figure, the operation of each of the pulleys 4 can be selectively stopped to fix each tension pulley 6 at a predetermined position.

According to this embodiment, in addition to the effect of the first embodiment, the operation of the tensioner 4 on the right side of the figure is stopped, and only the tensioner 4 on the left side of the figure operates to operate the left span of the transmission belt 3. By pressing 3a, the same state as in the case of the above-described first embodiment is obtained, and the driven pulley 1 makes a rotational movement in the clockwise direction. On the contrary, if the operation of the left tensioner 4 is stopped and only the right tensioner 4 operates to press the right span 3b of the transmission belt 3, the driven pulley 1 will rotate in the counterclockwise direction. Do exercise. Therefore, the rotation direction of the driven pulley 1 can be easily changed by selectively stopping the operation of the tensioners 4 and 4 on both sides in this way.

In each of the above embodiments, the case where the transmission belt only reciprocates has been described. However, the transmission belt composed of an endless belt is wound around the driving pulley and the driven pulley so that the driving pulley moves in one direction. When rotating, add reciprocating motion in the direction of rotation to the driving pulley,
Further, by providing the tensioner that presses the loose side span of the belt, the driven pulley is increased in speed more than the speed due to the rotation only by the rotational movement of the driving pulley. For example, when the driving pulley is attached to the output shaft of a diesel cycle engine, an Otto cycle engine, a rotary engine, or the like, the driving pulley is reciprocally oscillated in the rotation direction at a cycle where an explosion occurs in the combustion chamber of the engine. Can be rotated in any direction. Further, in this case, the driving pulley can be adopted as long as it has a substantially circular shape and does not damage the belt by rotating.

In each of the above embodiments, one driven pulley is rotationally driven. However, when a plurality of driven pulleys are provided, slippage between each driven pulley and the transmission belt is difficult. By making them different from each other, the peripheral speeds of the respective driven pulleys can be made different from each other, so that the peripheral speed of a specific driven pulley can be made faster, slower, or stopped rotating than other driven pulleys. be able to.

In the above embodiment, the V-belt is used as the transmission belt, but a flat belt, a V-ribbed belt, a round belt or the like that can perform frictional transmission can be used.

Furthermore, in each of the above embodiments, the transmission belt is pressed from the outer peripheral side, but it may be pressed from the inner peripheral side.

[0041]

As described above, according to the first aspect of the invention, the transmission belt is reciprocated in the belt length direction by the belt driving means while being wound around the driven pulley, and at that time. By applying pressure by the operation of the tensioner to the span on one side located between the driven pulley of the transmission belt and the belt driving means, the driven pulley can be rotated in one direction, so a simple mechanism It is possible to take out the rotary motion from the reciprocating motion.

According to the second aspect of the invention, the rotation direction of the driven pulley can be easily changed by selectively actuating the first and second tensioners that press both spans of the belt. can do.

According to the invention of claim 3, the above-mentioned claim 1 is adopted.
The belt driving means in the inventions of 1 and 2 is configured to have a swing arm to which the end belt is fixed and a swing means for swinging the arm. In the invention of claim 4,
The belt driving means according to the inventions of claims 1 and 2 is:
The driving pulley around which the endless belt is wound and the swinging means for reciprocating the pulley in the rotation direction are provided. Therefore, according to the inventions of claims 3 and 4, the belt driving means can be easily constructed. In particular, according to the invention of claim 4, since the transmission belt is an endless belt, it is possible to cause the driving pulley to perform a rotational movement in addition to the reciprocating movement, and when the rotational movement of the driving pulley causes rotational fluctuation. The rotational fluctuation energy can be utilized for the rotational movement of the driven pulley.

Further, according to the invention of claim 5, the urging force of the urging means of the tensioner is made variable. Therefore, by adjusting this pressing force, the pressing force of the abutting member against the belt is changed and the driven pulley. It is possible to obtain a transmission having a simple structure in which the rotation of the driven pulley can be changed, and for example, the driven pulley can be continuously changed by continuously changing the biasing force.

[Brief description of drawings]

FIG. 1 is a front view showing a rotation stopped state of a rotary drive device according to a first embodiment of the present invention.

FIG. 2 is a front view showing a driving state of the rotation driving device.

FIG. 3 is a front view showing belt driving means of the rotation driving device.

FIG. 4 is a front view showing a modified example of the belt driving means.

FIG. 5 is a front view showing a modified example of the tensioner.

FIG. 6 is a front view showing another modification of the tensioner.

FIG. 7 is a front view of a rotation drive device according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Driven Pulley 2 Drive Pulley 3 Transmission Belt 3a, 3b Span 4 Tensioner (First and Second Tensioner) 5 Arm 6 Tension Pulley (Abutting Member) 7 Fixed Body 8 Tension Coil Spring (Biasing Means) 9 Swing Arm 10 Motor (swing means) 11 Swing arm (swing member) 12 Hydraulic cylinder (biasing means) R Belt drive means

Claims (5)

[Claims] 1. A driven pulley rotatably provided, a transmission belt wound around the driven pulley, a belt driving means for reciprocating the transmission belt at least in the belt length direction, and a driven belt driven by the transmission belt. A rotary drive device comprising: a first tensioner that presses a span on one side located between a pulley and a belt drive means with a predetermined pressing force. 2. A second tensioner for pressing a span on the other side located between the driven pulley of the transmission belt and the belt driving means with a predetermined pressing force, wherein the first and second tensioners are alternatively. The rotary drive device according to claim 1, wherein the rotary drive device is configured to operate. 3. The transmission belt is an endless belt, and the belt drive means is swingable so that both ends of the endless belt are fastened and each end is alternately pulled with respect to a driven pulley. A moving member,
3. The rotation drive device according to claim 1, further comprising a swinging unit that swings the swinging member. 4. The endless belt is used as the transmission belt, and the belt driving means includes a driving pulley rotatably provided and a swinging means for reciprocally rotating the driving pulley about a rotation axis. 3. The rotary drive device according to claim 1, wherein the belt is wound around the driven pulley and the driving pulley. 5. The tensioner has an abutting member capable of abutting against the transmission belt and a biasing means for biasing the contacting member in the direction of abutting the transmission belt, and the biasing force of the biasing means. 5. The rotary drive device according to claim 1, 2, 3 or 4, wherein the rotary drive device is variable.