JP2002250420A - Continuously stepless variable speed change gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuously stepless variable speed change gear of engaging type which does not depend on friction transmission, capable of transmitting the power in the reverse direction and using it with temporally fixing the change ratio. SOLUTION: Attaching a plurality of small sized sprockets for attaching a clutch and backstop device to a device, capable of radially moving fittings at the same time and by the same quantity makes a special sprocket, and the polygonal perimeter of a chain surrounding the plurality of the special sprocket attached is set to the apparent pitch circumferential length of the special sprocket. In this variable speed change gear, the special sprocket is attached to an input shaft and an output shaft to interlock by engaging a chain link, the apparent pitch circumferential length is changed by radially moving the small sized sprocket in the reverse direction to each other, and the number of revolution of the input shaft and the output shaft can be changed. The power transmission of rotation in the opposite direction and usage at a fixed variable speed ratio can be made, by temporally fixing the rotation of the small-sized sprocket with the clutch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical continuously variable transmission.

[0002]

2. Description of the Related Art Conventional methods for continuously shifting continuously include a belt transmission using a special belt wheel whose apparent wheel diameter can be changed and a friction wheel on the input side pressed against a friction wheel on the output side. A method of changing the position and changing the speed has been put to practical use. However, there is no device that continuously changes the speed in a mechanically engaged state, and most of the power is transmitted by generating frictional force by pressing force. are doing.

[0003] A belt transmission type continuous stepless transmission expects frictional force between a belt wheel and a belt, and it is difficult to secure the frictional force when a large power is transmitted or when the load fluctuates.

[0004] In the transmission method by pressing a friction wheel, when a large power is transmitted, a large pressing force is required to secure a frictional force, and durability is a major problem. Since it is necessary to make contact with a small amount of deformation within the elastic range, special materials, rigidity, and processing accuracy are required.

In this method, as in the case of the belt transmission type, when a large power is transmitted or when the load fluctuates, if the load is large, it is difficult to secure the frictional force, and the manufacturing cost is high. In the method using the frictional force, since there is no mechanical meshing portion, when the friction coefficient changes, stable power transmission is difficult, so that the use environment is restricted.

[0006] Transmissions are widely used in industrial machines and general home appliances in large quantities for speed control, improvement of efficiency, and the like. Shifting accuracy varies, but unnecessarily pursuing accuracy only increases production costs and lowers market competitiveness.
Shift accuracy is required according to the application.

[0007] The demand for transmissions is heavily used in transport machinery, such as in automobiles. High speed and heavy ones require a shift when starting or stopping from the viewpoint of personal safety and protection of the machine. In a large-sized transport machine or the like, there are few examples in which the transmission is adopted because there are few transmissions having high transmission efficiency and it is expensive. Although the control of transport machinery is becoming more precise and complicated year by year, it is required that much of the attention of humans be used to judge external information in traffic conditions that are becoming more and more complicated. There is a need for a highly reliable and inexpensive transmission that tends to be smaller and that can easily control the speed.

[0008] In addition, in the great sense of energy saving, the transport machine itself is always required to be reduced in size and weight, and commercially low-priced machine is required. The transmission in a transport machine does not occupy a small proportion in terms of weight, size and cost. Although transmissions are used in general automobiles, there has been a demand for transmissions with simpler operation methods from manual transmissions that combine gears and clutches. Transmissions have begun to spread.

[0009] In addition, inverters and thyristor controls are examples of transmissions that can be easily mounted on a motor.
At present, it cannot be said that it is a device that can be used easily, because it is expensive, and there are problems unique to electrical equipment, such as its weak points such as low-speed characteristics.

[0010]

In the conventional continuous stepless speed change method using frictional force, if the transmission power is large, it is difficult to adopt a highly reliable device in terms of size, weight, and price. It is intended to solve the problem that the problem is often caused by a method that does not use frictional force. Another object of the present invention is to make it possible to cope with a method of use such as an engine brake in which power is transmitted in reverse rotation and power is used as a load so that it can be used as a transmission in an automobile or the like.

[0011]

SUMMARY OF THE INVENTION The transmission of the present invention is based on the conventional method of shifting by chain transmission found in a bicycle transmission or the like by preparing several types of sprockets on both the input side and the output side and bridging them. The sprockets on the input and output sides are special sprockets with a mechanism that allows the apparent pitch circumference (and consequently the number of teeth) to be changed arbitrarily due to the intermittent and step-by-step shifting method that replaces the existing chain wheel. This solves the problem of the continuous stepless speed change method using frictional force.

Further, by operating the clutch at an arbitrary speed ratio to fix the rotation of the small sprocket to form a single standard sprocket, power transmission in reverse rotation is also possible at an arbitrary speed ratio, and abruptly. It is possible to cope with how to use the engine brake used on slopes.

Since the transmission of the present invention shifts while maintaining the mechanical meshing state, there is no problem such as slippage, and the transmission is more reliable with respect to a large load or load fluctuation than the friction transmission type. The present invention, which requires no force, has advantages in size, rigidity, and weight compared to the friction transmission type shifting method that requires an increase in the required friction area and frame rigidity as the scale of the transmission power increases, and the overall size is small and light. Is possible. There is no special material or processing on the manufacturing side, and the manufacturing cost is lower than that of the conventional friction transmission type transmission that selects the manufacturing accuracy and material.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The conventional discontinuous step-like speed change method used in chain transmission is mechanically engaged by adopting sprockets having a special function for each of the input and output sprockets. And a continuously variable transmission that is commercially competitive.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A transmission system using a chain transmission showing the features of the present invention will be described with reference to the schematic diagram of FIG. The present invention is based on a combination of a special sprocket 16 and a chain wheel 7 in which a plurality of small sprockets 1 whose rotation direction is restricted are concentrically arranged and mounted via a clutch 23 on a special slide device which can move radially. Become. The special slide device includes a power distribution device 14, a drive device 10, a power source supply device 9, a male screw rod 3, a slide frame 4, and a rotation prevention guide 15.

The basic form of the present invention is that the special sprockets are attached to the input / output shafts 8 and 11, respectively, and linked with a chain wheel corresponding to a plurality of small sprockets. One of the sprockets can be a normal fixed sprocket, or the output shaft of one transmission is connected to the input shaft of another transmission, or these can be repeatedly combined to form one transmission.

FIG. 1 is a schematic diagram showing the basic structure of the transmission of the present invention. The basic structure of the special sprocket is a power distribution device 1 in which an even number of bevel gears 18 are annularly meshed.
4, a driving device 10 for rotating these gears, a power source supply device 9 for transmitting power supply and control signals, a male screw rod 3 attached to a bevel gear of a power distribution device, a female screw meshing with the male screw rod, and a male screw rod being cut. The small sprocket mounting shaft 5 protrudes from both sides of the slide frame 4 through which the male screw rod is inserted. The mounting shaft is a fixed shaft that does not rotate, and has a small sprocket 1 mounted via a reverse rotation preventing device 2 and a clutch 23 for fixing the small sprocket.

In the schematic diagram of FIG. 1, the clutch is mounted on each small sprocket individually, but the rotation of all the small sprockets may be fixed by one clutch, or the rotation of all the small sprockets may be fixed. Fix at the same time.

The slide frame is sandwiched between two discs of the turn-prevention guides 15 having the slide long hole guides 6 to prevent the slide frame from turning with the male screw rod. The special sprockets are linked with each other by using a chain wheel 7, and a tensioning device 12, a chain guide, and the like are attached as necessary to ensure smooth transmission.

As shown in FIG. 4, the power distribution device has a gear ring including an even number of bevel gears 18 meshed so as to rotate in total, and a gear having a built-in drive gear 22 for meshing and driving the gear rings. It is a box. If the number of gears constituting the gear ring in the power distribution device is an odd number, all the gears on the gear ring will not rotate if they mesh with each other. Cut off.

The driving device 10 for driving the power distribution device 14
In general, a motor that can be easily controlled can be considered, but a driving method using hydraulic pressure or manual operation by a human is also possible. If the driving power to be rotated is insufficient with one unit, a driving gear to be added is added while paying attention to the rotating direction of the meshing bevel gear of the gear ring, and a driving device is added. When vibration or strict control is required, a driving power with a braking device or a power capable of maintaining a position such as a servomotor is used.

The input / output shafts 8, 1 are provided at the center of the power distribution device 14.
When utilizing the center such as through one, the drive device 10 is mounted away from the center by combining the shape of the drive gear 22 or another gear. The power distribution device 14 and the drive device 10 are attached to the input / output shafts 8 and 11 and rotate together. Therefore, a power source supply device 9 is required to supply power to the drive device 10 that rotates together with the input / output shaft from a power source or a control device that is not rotating. For example, a power source supply device such as a slip ring type for transmitting electricity and a rotary swivel type for transmitting oil or air is required.

The slide frame 4 is moved by rotating the driving gear 22 by the driving device 10 and moving the plurality of bevel gears 18 of the gear ring meshed with the driving gear, and by moving the plurality of male screw rods 3 connected to the bevel gear. Are simultaneously rotated by the same number, so that the slide frame can be moved radially at the same speed.

The male screw 3 is connected to a shaft of a bevel gear 18 of a gear ring which is out of the gear case of the power distribution device 14,
It is used in combination with a female thread cut into the slide frame 4. When the rotation direction of each gear to which the male screw bar is attached is different, a combination of a left-handed screw and a right-handed screw is properly used in order to make the moving direction of the slide frame coincide.

In order to make the amount of movement of the attached slide frame the same, the male screw rods used for one special sprocket have the same thread pitch.

The plurality of small sprockets mounted on the slide frame are simultaneously moved evenly by the plurality of male screw rods rotated by the power of the power distribution device, and the special sprocket is rotated around the outside of the plurality of small sprockets mounted on the special sprocket. Change the apparent pitch circumference of the sprocket.

The number of rows of male screw rods 3 to be attached to the bevel gear is increased by zigzag arrangement of the meshing of the bevel gears 18 and the number of chains formed by the small sprockets 1 in each row is increased by increasing the number of chain wheels 7. The polygons interpolate between the corners of each other, and can be rotated as a polygon closer to a circle as a whole, so that power can be transmitted more smoothly.

As the combination of the male screw rod and the female screw of the slide frame, a combination of a ball screw and a nut that can be operated quickly can be used. In this case, the sliding speed is increased, but it is necessary to strengthen the function of holding the position of the slide frame as compared with the screw type.

A special sprocket using a ball screw / nut is mounted on the input shaft side, and a plurality of small sprockets are constructed so that a constant rotational force is applied to the drive gear by a motor, a hydraulic motor, a spring, or the like so that the small sprocket is always kept away from the input shaft. ,
When linked with the special sprocket using the ball screw and nut on the output side so that it operates in the opposite direction, the apparent pitch circumference that can be created by multiple small sprockets on the input shaft side when the rotational load at startup is large is large. As the pitch becomes smaller and the apparent pitch circumference on the output shaft becomes larger, the transmission ratio becomes larger, and the output shaft obtains a large rotational force with low rotation.As the rotational load on the output shaft decreases, the number of input and output shafts increases. An automatic transmission in which the pitch circumference of the small sprocket moves in the opposite direction, the gear ratio automatically decreases, and the rotation speed of the output shaft increases.

The slide frame is provided with a female screw which engages with the screw of the male screw rod, the hole penetrates the slide frame, and the male screw rod penetrates and is assembled. The small sprocket mounting shafts 5 that do not rotate with the male screw bar interposed therebetween are protruded one by one from both sides of the slide frame, and the small sprocket 1 is mounted on one or both sides by the reverse rotation preventing device 2 and the clutch 23.

The small sprocket is fixed to the small sprocket mounting shaft 5 of the slide frame in one direction and idlely rotated in the other direction. Therefore, a reverse rotation preventing device 2 such as a one-way clutch or a ratchet for limiting the rotation direction is attached to the small sprocket. Attach to the mounting shaft. Further, when the transmission is reversely rotated to transmit power or when the rotation speed of the output shaft 11 is
In order to use the engine as a load when the rotation speed exceeds the rotation speed of the engine, the clutch 23 is fixed to the slide frame 4 so that the rotation of the small sprocket is fixed and the special sprocket functions as a fixed sprocket.
And small sprocket 1.

When the small sprocket is mounted on a special sprocket used on the input shaft side, the idle rotation direction is the same as the input shaft rotation direction, and the opposite direction is the rotation direction of the slide frame mounting shaft. Install all small sprockets so that they are fixed.

In the case of a special sprocket used on the output shaft side, all the small sprockets are fixed so that the same direction as the rotation direction of the output shaft is fixed to the mounting shaft of the slide frame, and the opposite direction is the idle rotation direction. Install.

The number of slide frames attached is one for each male screw rod, but the number of fixed shafts of the slide frame is two.
The number of small sprockets can be either single sided or double sided, and the number of transmission chain wheels can be single row or double row depending on the load.

When the transmission of the present invention is used in an automobile or the like, the small sprocket constituting the special sprocket rotates the input shaft in the reverse direction, such as when the vehicle is moved backward, and the small sprocket does not rotate when the reverse rotation preventing device alone is used. And cannot transmit power in reverse rotation. Further, when the rotation speed on the output side exceeds the rotation speed on the input side, the chain wheel runs on the small sprocket on the input side with only the reverse rotation preventing device, and power cannot be transmitted, and speed control becomes impossible.

In order to solve this problem, the plurality of small sprockets constituting both special sprockets have a structure which can be arbitrarily fixed by a clutch separately from the reverse rotation preventing device.
As a result, the small sprocket acts as a part of the large fixed teeth of the special sprocket, so when the power is transmitted by reverse rotation or when the output speed exceeds the input speed, the prime mover is used as a load and the output shaft is Usage methods such as engine braking to reduce rotation are possible.

However, if the small sprocket is moved radially while keeping the rotation of the small sprocket fixed, the speed cannot be changed because there is no portion for adjusting the change in the chain length between the small sprockets. For this reason, when the transmission of the present invention is applied to an automobile or the like, it is considered that a single reverse gear ratio is sufficient if the accelerator is adjusted as in a current vehicle, and when reverse, the reverse gear ratio is fixed and both special sprockets are fixed. Activate the clutch to fix all small sprockets simultaneously.

The same applies to the method of using the engine brake. It is not necessary to change the speed frequently during deceleration, and the set speed ratio is normally used until the deceleration is completed. Activate the sprocket clutch to fix all small sprockets simultaneously.

In order to prevent malfunction, the transmission of the present invention secures safety by preventing the gear shifting operation for moving the small sprocket of the special sprocket radially and the clutch operation for fixing the same to be simultaneously performed electrically or mechanically. .

In order to increase the speed of the transmission of the present invention by increasing the number of revolutions on the output shaft side from the number of revolutions on the input shaft side, an apparent pitch circumference formed by a plurality of small sprockets of the special sprocket on the input shaft side is used. Make the length larger than the apparent pitch circumference made by multiple small sprockets of the special sprocket on the output shaft side.

A plurality of small sprockets attached to the special sprocket on the output shaft side are moved to the rotation center side of the special sprocket by rotating a male screw attached to the power distribution device to reduce the apparent pitch circumference. I do.

On the other hand, a plurality of small sprockets attached to the special sprocket on the input shaft side are similarly moved away from the center of rotation of the special sprocket to increase the pitch circumference.

In the special sprocket on the output shaft side, if the apparent pitch circumferential length is reduced, the chain length wound around the special sprocket on the output shaft side is left.

The small sprocket constituting the special sprocket on the output shaft side idles in the direction opposite to the rotation direction of the chain wheel, but the rotation direction of the chain wheel is fixed to the mounting shaft of the slide frame so as not to rotate. A reverse rotation prevention device is installed.

Therefore, the extra chain length of the special sprocket on the output shaft side is not sent out in the direction of rotation of the chain wheel, but the so-called return side (front side) of the special sprocket on the output shaft side, on the front side where the chain is retracted. To the loose side.

Also, the special sprocket on the input shaft side does not move in the direction opposite to the rotation direction of the chain wheel due to the function of the reverse rotation prevention device attached to the small sprocket that constitutes the sprocket. Since the extra chain length is not absorbed, the special sprocket on the output shaft side accelerates the rotation by this amount to accelerate the speed increase.

When the apparent pitch circumference of the special sprocket on the input shaft side is increased, the distance between the small sprockets meshing with the chain is evenly and simultaneously increased. The chain length between the constituent small sprockets is insufficient.

Although the length of the chain between the small sprockets is short at the same time, the rotation direction of the chain wheel is determined by the action of the reverse rotation prevention device attached to the small sprocket. Insufficient chain length is achieved by pulling in the chain in the direction opposite to the rotation direction of the chain wheel immediately after the meshing part and replenishing it.

Since replenishment between the small sprockets is performed at the same time, apparently, among the plurality of small sprockets meshing with the chain wheel, the leading small sprocket in the direction in which the chain wheel rotates is the entire small sprocket. It becomes a form to pull in the shortage length at once.

The small sprockets after the head are separated from the adjacent small sprockets while being rotated by the chain to which the small sprocket is pulled while preventing the chain wheel from reversing.

Due to the synergistic effect that the apparent pitch circumference of the special sprocket on the input shaft side is increased and the apparent pitch circumference of the special sprocket on the output shaft side is reduced, the rotation speed on the output shaft side is increased and the transmission is shifted. I do.

In order to reduce the rotation speed of the output shaft side from the rotation speed of the input shaft side and reduce the speed, the apparent pitch circumference made by a plurality of small sprockets of the special sprocket on the input shaft side is determined by the following formula. It is smaller than the apparent pitch circumference made by a plurality of small sprockets of a special sprocket.

The plurality of small sprockets attached to the special sprocket on the output shaft side are moved in a direction away from the center of rotation of the special sprocket by rotating a male screw attached to the power distribution device, and the apparent pitch circumference is changed. Increase the length.

On the other hand, a plurality of small sprockets attached to the special sprocket on the input shaft side are moved to the rotation center side of the special sprocket in a similar manner to reduce the apparent pitch circumference.

If the apparent pitch circumferential length of the special sprocket on the input shaft side is reduced, the length of the wound chain becomes excessive, but as described above, the small sprocket does not rotate in the direction opposite to the rotation direction of the chain wheel. The length of the chain is sent out in the direction of rotation of the chain wheel, so-called return side (slack side).

In the special sprocket on the output shaft side, the plurality of small sprockets do not rotate in the rotation direction of the chain wheel for the above-described reason. Not absorbed by sprockets.

When the apparent pitch circumference of the special sprocket on the output shaft side is increased, the distance between the small sprockets meshing with the chain wheel is simultaneously and simultaneously increased, so that the chain length between the small sprockets is insufficient. I do.

In the special sprocket on the output shaft side, of the plurality of small sprockets meshing with the chain wheel, the last small sprocket in the direction opposite to the rotation direction of the chain wheel is the one on the input shaft side when the speed is increased. As with the movement of the special sprocket, the chain length between a plurality of small small sprockets is pulled at once.

The small sprocket before the last one moves away from the adjacent small sprocket while being rotated by the chain to which the last small sprocket is pulled while preventing the chain wheel from reversing, and the special sprocket on the output shaft side is an apparent sprocket. Increase the pitch circumference.

As described above, the special sprocket on the input shaft side does not move the meshing chain in the reverse direction, and the special sprocket on the output shaft side has a short chain length to increase the apparent pitch circumference. While pulling the chain on the outgoing side (tension side) while rolling on the chain itself, and at the same time the special sprocket on the input shaft side reduced the apparent pitch circumference, so the extra return side (slack side) ) Pull in the chain.

By repeating the above operations sequentially, the apparent pitch circumference of the special sprocket on the input shaft side is reduced, and the apparent pitch circumference of the special sprocket on the output shaft side is increased, whereby the speed can be reduced.

When the gear is not shifted, the gears of the bevel gear ring in the power distribution device are rotated by the driving power connected to the driving gears.
Rotating the male screw rod to move the slide frame, speeding up both apparent pitch circumferences made of multiple small sprockets of special sprockets attached to the input and output shafts,
If the speed is made the same by any one of the methods of deceleration, the rotation speed on the output shaft side becomes the same as the rotation speed on the input shaft side, and no speed change is performed.

In order to make the rotation of the chain wheels hanging on the special sprockets of both shafts smooth and to make the power transmission smooth, a device such as a chain tensioning device or a chain stopper is installed as necessary.

The movement of each special sprocket of the input / output shaft can be determined by calculation because the length of the chain is constant, but simply by appropriately managing the tension of the chain, the movement of one special sprocket can be determined. By controlling the operation, the operation of the other special sprocket is inevitably determined, so that the gear can be shifted without difficulty and the operation at the time of gear shifting can be made smooth.

When using the reverse rotation power transmission and engine brake required when the vehicle is moving backwards, the speed change operation is fixed after the gear ratio is determined as described above, and the clutches of both special sprockets are operated to operate the small sprocket. All the special sprockets can work as fixed sprockets by fixing all of them at the same time so that they do not rotate.
After use, if the clutch is released, the original continuous continuous stepless transmission will be obtained.

According to the present invention, there is basically no limitation on the power scale, and demand can be expected in a wide range of industrial fields such as construction machines, agricultural machines, and ships. It is commercially competitive compared to current vehicle transmissions, and the combination of computers and electronics makes full use of the characteristics of the prime mover and enables extremely simple speed control. We think that we can contribute to.

[Brief description of the drawings]

FIG. 1 is a schematic view of an example in which a special sprocket is mounted on both an input shaft and an output shaft.

FIG. 2 is a schematic view showing a combination of a standard sprocket and a special sprocket.

FIG. 3 is a schematic diagram of an example in which a plurality of units are combined.

FIG. 4 is a schematic diagram of a power distribution device. The upper diagram is a diagram viewed from above, and the lower diagram is a schematic diagram viewed from the front.

FIG. 5 is a schematic view of a partially developed example in which the gears of the gear ring of the power distribution device are meshed in a zigzag manner.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 small sprocket 2 reverse rotation prevention device 3 male screw rod 4 slide frame 5 small sprocket mounting shaft 6 long hole guide for slide 7 chain wheel 8 input shaft 9 power source supply device 10 drive device 11 output shaft 12 tension device 13 control sensor 14 power Distributor 15 Rotation prevention side plate 16 Special sprocket 17 Standard sprocket 18 Bevel gear 19 Input shaft side special sprocket 20 Output shaft side special sprocket 21 Connecting shaft 22 Drive gear 23 Clutch

Claims (9)

[Claims] A transmission according to the present invention is provided with one large sprocket mounted on a special slide device capable of radially moving a plurality of small sprockets mounted on a concentric circle by restricting the rotation direction by a reverse rotation prevention device. As a special sprocket,
The input and output shafts are attached and linked with a transmission chain wheel. This special sprocket is also equipped with a clutch that can lock the rotation of a plurality of small sprockets at any one time. The chain wheel is equipped with a chain tensioning device, idler, stopper, etc., as necessary, to facilitate movement. The slide device is composed of a power distribution device, a male screw bar, a slide frame, a drive device, and a power source supply device, and can radially move components mounted on the slide frame. In the power distribution device, gears are meshed in an annular shape, a male screw rod can be connected to each gear, a drive device is meshed with a part of the annular gear, and power and control signals are supplied from the outside by a power source supply device This is a device capable of controlling the rotation of the connected male screw rod by controlling the rotation of all gears meshed annularly. The male screw bar is fitted with a slide frame with a female screw hole that engages, and a small sprocket with a reverse rotation prevention device is mounted. The thread of the male threaded rod uses a screw pitch and a right-handed thread or a left-handed thread so that the slide frame moves concentrically and radially depending on the rotation direction of the gear to be mounted. The apparent pitch circumference of a special sprocket is the outer circumference of a polygon formed by turning a chain around a plurality of small sprockets mounted radially, and the apparent pitch circumference changes by moving the small sprockets radially. be able to. By changing the apparent pitch circumferences of the special sprockets mounted on the input shaft and the output shaft to be opposite to each other, a continuous stepless speed change with the apparent pitch circumference ratio as the speed ratio is possible and electrical or A mechanism was installed so that the gear shifting operation and the clutch operation for fixing the rotation of the small sprockets could not be operated at the same time mechanically. A meshing type continuously variable transmission characterized by being able to arbitrarily select forward or reverse rotation power transmission at an arbitrary speed ratio by fixing. 2. The apparatus according to claim 1, wherein the special sprocket on the input shaft side is a fixed sprocket whose shape does not change. 3. The apparatus according to claim 1, wherein the special sprocket on the output shaft side is a fixed sprocket whose shape does not change. 4. An output shaft of a device according to claim 1, 2 or 3 is connected to an input shaft of another device according to claim 1, 2 or 3. Or a device characterized by repeating connection and using a plurality of units in combination. 5. A gear train in a power distribution device is arranged in a zigzag manner and meshed with a plurality of externally threaded rods, and the arrangement interval of the externally threaded rods as viewed from the direction of the rotation axis of the special sprocket is reduced to produce a small sprocket in each row. 5. The apparatus according to claim 1, wherein a special sprocket is used, wherein the polygons of the chain interpolate between the corners of each other to make the polygon closer to a circular shape. 6. An apparatus according to claim 1, wherein a special sprocket is used in which a male screw of the slide device is a ball screw, and a female screw portion of the slide frame that meshes with the male screw is a nut for a ball screw. An apparatus according to claim 1. 7. A special sprocket according to claim 6 is attached to an input shaft side, and a constant rotational force is always applied to a drive gear of a power distribution device so as to always increase an apparent pitch circumference. The apparent pitch circumference of the special sprocket on the input shaft side automatically changes according to the load by using a drive device such as a motor, a hydraulic motor, or a spring that can be used. The apparatus according to claim 6, wherein the apparatus does not include a device that performs the operation. 8. A chain wheel such as a roller chain or a silent chain is used for a chain wheel for transmission between the input and output shafts, and a chain wheel corresponding to the chain is used.
An apparatus as described in. 9. A belt wheel such as a V-belt, a toothed belt, a loaf, or the like, is used for a chain wheel for transmission between the input and output shafts, and a corresponding wheel truck is used. Apparatus according to claims 1 to 7.