JPH1179056A - Rotation driver of object and bicycle using such driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a rotation driver provided with a mechanism to change reciprocating motion into rotating motion as being capable of freely varying torque by simply improving the shape of a freewheel and provide such a bicycle using the rotation driver as being capable of improving its running performance by varying torque. SOLUTION: The mainbody 19 of a freewheel 15 is formed in a curved shape (an irregularly curved shape, e.g.), instead of a simple disc shape, with a distance from the center axis of the peripheral face gradually varied continuously greater along the peripheral direction. A distance from the rotational center of the freewheel mainbody 19 to the outer peripheral face, where a wire 16 is engaged, is differentiated for every rotationally moving angle of the freewheel mainbody 19. A speed is so automatically changed that greater torque can be generated at the beginning of stepping pedals 8, 9 of a bicycle and gradually reduced in the way of stepping to gradually change the speed with the change of the stepping amount of the pedals 8, 9, instead of the stepwise change.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an object such as a wheel or an impeller in a manually driven vehicle such as a bicycle or a boat, or a wheel or the like in a fitness apparatus or the like in which only the wheel is rotated by a foot in a fixed position to improve leg strength. And a bicycle using the rotary drive device.

[0002]

2. Description of the Related Art Conventionally, as a rotary driving device provided with a mechanism for converting a reciprocating motion into a rotary motion, a freewheel that is rotated to rotate an object is provided, and a rotating direction of the object is set with respect to the freewheel. A return spring is provided to apply an elastic rotation biasing force in a direction opposite to that of the freewheel. There is known a rotary driving device that applies a rotary driving force to an object by the rotation of the spring and the rotation by the elastic rotation urging force applied by the return spring (Japanese Utility Model Laid-Open No. 54-114256, Japanese Utility Model Application Laid-Open No. No.-6171, Japanese Utility Model Laid-Open No. 55-831
No. 84, etc.).

[0003] Such a rotary drive device is a manually driven vehicle,
For example, it is used for bicycles and the like. For example, both treads (pedal) placed on both sides of the bicycle body frame
The rear ends of the treads are pivotally supported at the rear of the main body frame, and the front ends of both treads are rotatable up and down. One end of each chain is connected to both treads, and the rotation of the treads is transmitted to the rear axle via a chain wheel, and the other end of each chain is connected to the body frame via a tension spring. Have been.

In such a bicycle, the freewheel rotates forward by a predetermined rotation angle due to the chain pulled by alternately stepping on both treads, and the chain wheel rotates similarly, and the chain is also pulled by the tension spring. When the wheel is returned, the freewheel rotates rearward by a predetermined rotation angle, but the chain wheel does not rotate, and by repeating these, the rear wheel is given a rotational driving force in the forward direction, and the bicycle runs. It is supposed to.

[0005]

However, in a bicycle using such a conventional rotary drive device, the freewheel is usually formed in a simple disk shape, and the center of the freewheel is generally not limited to the above. Is the same for all rotation angles of the freewheel. That is, the torque that rotates the freewheel, that is, the rear wheel by pulling the chain,
It is uniform in the entire rotation range of the tread.

For this reason, the front gear is rotated by a pedal,
In a general bicycle that can run by rotating a rear wheel to which a rear gear connected to this gear via a chain is attached, a gear mechanism that changes the gear ratio between the front and rear and the gear ratio is made simpler. Although the torque can be varied in such a bicycle as described above, the torque cannot be varied.For example, on a flat road surface, the rear wheel is rotated with a small torque to increase the traveling speed, and on a slope etc. It is not possible to respond to a demand for easy climbing by turning the rear wheel with a large torque to reduce the stepping force of the tread.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is a rotary driving apparatus for an object provided with a mechanism for converting a reciprocating motion into a rotary motion. An object of the present invention is to provide a rotary drive device for an object capable of freely changing a torque by an improvement and a bicycle using the rotary drive device, which is capable of improving running performance by variable torque. Aim.

[0008]

According to a first aspect of the present invention, there is provided a rotary driving apparatus for an object, comprising: a freewheel that is rotated to rotate the object; A return spring for applying an elastic rotation biasing force in a direction opposite to the rotation direction is provided, and a rope is laid between the freewheel and a member that performs repetitive linear motion or repetitive swinging motion, and is pulled by the freewheel cable. In the rotary driving device that applies a rotary driving force to the object by the rotation of the freewheel and the rotation by the elastic rotation urging force applied by the return spring, the main body of the freewheel has a peripheral surface from its central axis. Is formed in a curved surface shape such that the distance gradually changes gradually from small to large along the circumferential direction, and an engaging portion with which the rope is engaged is formed on the circumferential surface. Inside the circumference Wherein the minimum unit of the distance from the axis rope, characterized in that has been linked.

[0009] The invention according to claim 2 is characterized in that the curved surface of the freewheel is a curved surface having a spiral shape.

The invention according to claim 3 is characterized in that the spiral is a logarithmic spiral or Archimedes spiral.

According to a fourth aspect of the present invention, the cable is a wire, and the engaging portion formed on the outer peripheral surface of the freewheel body is a V-shaped groove or a U-shaped groove with which the wire is engaged. Features.

The invention according to claim 5 is characterized in that the rope is a chain, and the engaging portion formed on the outer peripheral surface of the freewheel body is a tooth portion with which the chain is engaged.

According to a sixth aspect of the present invention, the freewheel is provided at a freewheel main body connected to the cable, a rotary drive shaft connected to an object, and a rotation center of the freewheel main body, A support portion for supporting the freewheel main body on the rotary drive shaft, the freewheel main body and the rotary drive shaft being engaged at the time of rotation by being pulled by a cable of the freewheel main body, And a support portion having a built-in ratchet mechanism for releasing the engagement between the freewheel body and the rotation drive shaft when the rotation is performed by the applied elastic rotation biasing force.

The invention according to claim 7 is characterized in that the object is a wheel of a manually driven vehicle.

The bicycle according to the invention of claim 8 is the first invention.
6 is characterized in that a rotary drive device for any one of the objects is provided as a rotary drive device for wheels.

According to a ninth aspect of the present invention, there is provided a two-wheeled vehicle provided with wheels at the front and rear of the frame body, wherein the rear wheels are rotationally driven by a rotary driving device.

According to a tenth aspect of the present invention, the rotary drive device is independently provided on both side portions of the frame main body, and a pair of mutually parallel, mutually separated, left and right side portions of the frame main body are provided. A rail member extending in the vertical direction is attached, a left pedal as a member that repeats linear movement is slidably mounted on a pair of left rail members, and a right pedal as a member that repeats linear movement is mounted on a pair of right rail members. The pedals are slidably mounted, and each pedal and each freewheel body of the rotary drive device independently provided on both sides of the frame body are connected by a cable, and between the pedal and the rotary drive device, The intermediate rotating body over which the cable is hung is attached to the frame main body and located.

According to an eleventh aspect of the present invention, the rail member is disposed in a forwardly inclined state in which an upper end position is located forward of the frame main body from a lower end position, and the pedal is inclined obliquely rearward from above. It is characterized by being slid.

According to a twelfth aspect of the present invention, there is provided a rotary driving force transmitting mechanism for transmitting a rotary driving force from a gear rotationally driven by the rotary driving device to a gear connected to a driving shaft of a rear wheel via a chain. It is characterized by having been done.

The operation of the present invention will be described. According to the first aspect of the present invention, the rotation of the member that is repeatedly linearly or oscillatingly moved by the rotation of the freewheel pulled by the rope and the rotation by the elastic rotation biasing force applied by the return spring. A rotational driving force is applied to the object. And the freewheel body is not a simple disk shape, but its peripheral surface is formed in a curved surface shape such that the distance from the center axis gradually changes from small to large continuously along the circumferential direction. The distance from the center of rotation of the freewheel body to the outer peripheral surface with which the rope is engaged differs for each rotation angle of the freewheel body.

That is, the torque for rotating the freewheel body, that is, the object due to the pulling of the rope, differs depending on the depth position of the member that is repeatedly linearly moved or repeatedly rocked. In other words, a large torque is generated at the beginning of the motion of the member performing the repetitive linear motion or the repetitive rocking motion, and the generated torque gradually decreases as the motion progresses. An effect that can be said to be an automatic shift in which the shift is gradually performed by a change in the depth position of the moving member is achieved.

According to the second aspect of the present invention, the peripheral surface of the main body of the freewheel has a curved surface shape in which the distance from the center axis gradually changes from small to large along the circumferential direction. It can be easily formed by a curved surface.

According to the third aspect of the present invention, when a curved surface having a linear shape of Archimedes is applied, the freewheel main body is rotated by a predetermined angle to rotate the freewheel body with a member that performs repetitive linear motion or repetitive swing motion. The initial rotation angle position can be changed by adjusting the length of the cable spanned during the period, and thus the initial torque can be changed.

In the invention according to the fourth aspect, the freewheel body can have a simple pulley-like structure by using the wire as a wire.

[0025] In the invention according to claim 5, since the cable is a chain, the engagement between the cable and the freewheel main body is securely performed, no slippage or the like occurs, and the freewheel main body is securely connected. Rotary power can be applied.

According to the sixth aspect of the present invention, when the freewheel body is rotated by being pulled by the cable, the freewheel body and the rotary drive shaft engage to rotate the rotary drive shaft, thereby returning the return spring. The engagement between the freewheel body and the rotary drive shaft is released when the freewheel body is rotated by the elastic rotation biasing force given by the above, and the freewheel body idles with respect to the rotary drive shaft.

In the invention according to claim 7, the torque for rotating the wheels of the manually driven vehicle is varied.

In the invention according to claim 8, the torque for rotating the wheels of the bicycle is varied.

According to the ninth aspect, the torque for rotating the rear wheel of the bicycle is varied.

According to the tenth aspect of the present invention, the rotary drive shaft is continuously rotated in one direction by the alternate repetition of the alternate stepping operation of the left and right pedals and the alternate stepping release operation, and the rear wheels are driven in the same direction. The bicycle runs while turning in the direction. or,
Since the left and right pedals are independent, the pedal depression depth position (torque position) can be freely adjusted.

According to the eleventh aspect of the present invention, the pedal is slid obliquely backward from the upper side to the lower side, so that the left and right pedals can be easily depressed alternately, and the fatigue of the driver can be suppressed. Also, on an uphill, the force component in the sliding direction applied to the pedal increases in accordance with the slope of the slope, and the stepping force of the driver is reduced.

In the twelfth aspect, the rotation of the freewheel main body is transmitted to the rear wheel by a rotational driving force transmission mechanism including a gear and a chain.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a side view showing an entire embodiment of a bicycle according to the present invention to which an embodiment of a rotary driving device for an object according to the present invention is applied. FIG. 2 is an enlarged side view of the rotary driving device. 1 is a schematic view of a rotary drive device. In these figures, the bicycle is a two-wheeled vehicle provided with wheels 2 and 3 at the front and rear portions of a frame main body 1, respectively.
Is provided. That is, the frame main body 1 includes a front frame main body 1A having a handle portion 5 at an upper portion and extending in a vertical direction, and a horizontal frame extending obliquely lower in a rearward direction from a substantially middle portion in the longitudinal direction of the front frame main body 1A. It is composed of a main body 1B and a pair of left and right mounting frame main bodies 1C for mounting the rotation drive device 4.

Each of the mounting frame bodies 1C extends in the front-rear direction and has an upper frame 1a having a front end connected to the front end of the horizontal frame body 1B, a lower frame 1b extending in the front-rear direction, and an upper frame. Connecting frame 1c for connecting the rear end of the portion 1a to the rear end of the lower frame 1b
At the lower end of the connection frame 1c, these frame portions 1a to 1c are integrally formed with the horizontal frame main body 1B.

Between the front end of the upper frame portion 1a and the front end of the lower frame portion 1b of each of the mounting frame main bodies 1C,
Two mutually parallel rail members 6, 7 extending in the vertical direction in parallel with each other are stretched over and connected to each other. A left pedal 8 is attached to the pair of left rail members 6 and 7.
The right pedal 9 is slidably mounted on the pair of right rail members 6 and 7.

Each of the pedals 8 and 9 has a slide guide 10
A cylindrical portion 10A having upper and lower ends opened at both sides of the slide guide portion 10 is integrally formed. The pedals 8 and 9 are slidably attached to the rail members 6 and 7 with both cylindrical portions 10A of the slide guide portion 10.

The rail members 6, 7 are disposed in a forwardly inclined state in which the upper end position is located forward of the frame body 1 from the lower end position, and the pedals 8, 9 are obliquely rearwardly moved downward from above. Will be slid. Further, the frame body 1 is provided with a backrest portion or a saddle portion for facilitating the operation of the bicycle driver depressing the pedals 8 and 9.

Next, the structure of the rotary drive device 4 mounted on such a bicycle will be described. The rotary drive devices 4 are provided independently on both sides of the bicycle. Here, only the configuration of the rotary drive device 4 on one side (left side of the bicycle) will be described. That is, the rotation driving device 4
Small gear 12, large gear 13, small gear 12, large gear 13
A freewheel 15 provided on the side of the large gear 13, a wire 16 as a cable,
And a spring 17 as a return spring.

The details of this configuration will be described below.
Is connected to a rotary drive shaft 3A of the rear wheel 3 via a ratchet mechanism (not shown), and the ratchet mechanism allows the rear wheel 3 to rotate only in the forward direction of the bicycle (counterclockwise in FIG. 1). When the vehicle rotates in the opposite direction (clockwise direction in FIG. 1), it rotates without interlocking with the rear wheel 3.

The rotary drive shaft 18 of the large gear 13 is rotatably supported by a connecting portion between the upper frame portion 1a and the connecting frame portion 1c in the mounting frame body 1C. As shown in FIG. 4, the freewheel 15 includes a freewheel body 19 connected to a wire 16 and a large gear 1.
And a supporting portion 20 provided at the center of rotation of the freewheel main body 19 and supporting the freewheel main body 19 on the rotary driving shaft 18.
When the freewheel body 19 is rotated by being pulled by the wire 16, the freewheel body 19 is engaged with the rotation drive shaft 18, and the freewheel body 19 is rotated by the elastic rotation biasing force applied by the mainspring 17. And a support portion 20 having a built-in ratchet mechanism for releasing the engagement between the freewheel body 19 and the rotary drive shaft 18 at times.

The main body 19 of the freewheel 15 is
The ratchet mechanism interlocks with the large gear 13 only when the bicycle rotates in the forward direction (counterclockwise in FIG. 1), and when the bicycle rotates in the opposite direction (clockwise in FIG. 1), the large gear It is designed to run idle without interlocking with 13. As shown in FIG. 5, the freewheel main body 19 has a peripheral surface formed into a curved shape such that the distance from the rotation center A gradually changes from small to large continuously along the circumferential direction. . Specifically, the curved surface has a spiral shape,
Specifically, the wire 16 has a logarithmic linear shape, and a V-shaped groove or a U-shaped groove 21 described later on which the wire 16 is hung is formed on the peripheral surface. Such freewheel 15
For example, it is formed to have a maximum radius of 108 mm, a minimum radius of 20 mm, and a spiral line length of 339 mm.

FIG. 4 shows a specific configuration of the freewheel 15. In this figure, the freewheel body 19
Is composed of a pair of left and right side plate portions 19A and an intermediate portion 19B located between the two side plate portions 19A and coupled to the both side plate portions 19A. In this case, the side plate portion 19A has a curved surface portion 19a that forms a
a, a straight line portion 1 connecting a line start point B and an end point C (see FIG. 5)
9b are provided, and a mounting hole 22 of the rotary drive shaft 18 described later is opened.

The intermediate portion 19B is constituted by a curved plate portion 19c which forms a line as described above.
The V-shaped groove or the U-shaped groove 21 is formed on the outer peripheral surface of 9c. The support portion 2 having a built-in bearing (not shown) and a ratchet mechanism for supporting the rotary drive shaft 19 inside the rotary drive shaft 19 of the freewheel 15.
0 is provided. In addition, a pulley 23 for winding the mainspring 17 is provided integrally with the support 20.

The rotary drive shaft 19 is inserted through the mounting hole 22 of the freewheel body 19 and
The outer peripheral surface is fixedly attached to the inner peripheral surface of the mounting hole 22. On the other hand, one end of a mainspring 17 serving as a return spring for applying an elastic rotation biasing force to the freewheel body 19 in a direction opposite to the direction of rotation caused by the pulling of the wire 16 is used for winding the return spring of the rotary drive shaft 19. Pulley part 2
3 is fixedly attached to the outer peripheral surface, and the other end is the frame body 1
Is fixedly attached to the portion D in FIG.

One end of the wire 16 is fixedly attached to the slide guide portion 10 of the pedal 8, and is wound around a pulley 25 rotatably supported on the frame body 1 via a shaft 24. V-shaped groove or U
The freewheel body 19 is wound around the
It is connected to the start point B of the lane line (see FIG. 5).

The operation of the bicycle provided with the rotation driving device 4 having such a configuration will be described. In the initial state of the rotary drive device 4,
Freewheel body 1 due to spring force of spring 17
9 is urged by a turning urging force in the counterclockwise direction in FIG. 1, the portion of the wire 16 on the freewheel body 19 side is wound around the outer peripheral surface of the freewheel body 19, and the pedal 8 is 2 is located at the uppermost part of the rail members 6, 7 indicated by E. In FIG. 2, F is the position of the wire 16 at this time.

Here, when the pedal 8 is depressed with a foot, the pedal 8 slides downward along the rail members 6 and 7, and
Along with this, the wire 16 is pulled. When the wire 16 is pulled, a turning force is applied to the freewheel body 19 to which the wire 16 is connected, and the freewheel body 19 rotates counterclockwise while the wire 16 is rotated around the outer periphery of the freewheel body 19. The wire 16 is completely separated from the outer peripheral surface of the freewheel body 19 at a stage where the pedal 8 is gradually released from the surface and the pedal 8 is slid to the lowermost portion of the rail members 6 and 7 shown by G in FIG. B
(See FIG. 5). In addition, in FIG. 2, H is the position of the wire 16 at this time.

By the rotation of the freewheel body 19, the rotation drive shaft 18 is rotated counterclockwise, whereby the large gear 13 is rotated, and the small gear 1 is rotated via the chain 14.
2 rotates, and the rear wheel 3 rotates. At this time, the mainspring is wound up from the return spring winding pulley 23 of the rotary drive shaft 18.

Next, when the depression of the pedal 8 is released,
The pulling force on the wire 16 is released. On the other hand, the spring force of the mainspring 17 causes the freewheel body 19 to move.
Is rotated clockwise, and the wire 16 is returned, whereby the pedal 8 slides up along the rail members 6 and 7. Even if the freewheel body 19 rotates clockwise, the ratchet mechanism allows the freewheel body 1 to rotate.
Since the link between the rotary drive shaft 9 and the rotary drive shaft 18 is released, the rotary drive shaft 18 does not rotate, and the freewheel body 19 idles with respect to the rotary drive shaft 18.

That is, when the pedal 8 is depressed, the freewheel main body is rotated, whereby the rotary drive device is rotated, and the rear wheel is rotated counterclockwise. When the pedal is released, only the freewheel main body is released. Rotates clockwise to the initial position. Therefore, the rotation drive shaft 18 is continuously rotated in the counterclockwise direction by the alternating repetitive operation of the alternate depression operation of the left and right pedals 8 and 9 and the alternate depression release operation, and the rear wheel 3 is rotated in the counterclockwise direction. The bicycle rotates and turns.

According to the rotation driving device 4 having such a configuration, the freewheel main body 19 is not a simple disk, and its peripheral surface has a continuous distance from its central axis that gradually increases from small to large along the circumferential direction. Is formed in a curved surface shape (a helical curved surface shape in this embodiment), the distance from the rotation center A of the freewheel body 19 to the outer peripheral surface with which the wire 16 is engaged is equal to the freewheel body. It differs for each of the 19 rotation angles. That is, the torque for rotating the freewheel body 19, that is, the rear wheel 3 by pulling the wire 16 is different at the sliding position of the pedal 8.

For example, when the pedal 8 is located at the uppermost position, the wire 16 is engaged with substantially the entire outer peripheral surface of the freewheel body 19, and the wire 16 is moved to the outer periphery of the freewheel body 19 as the pedal 8 is depressed. The position of engagement with the surface changes from a position larger than the rotation center A of the freewheel body 19 to a position smaller.

Accordingly, the torque for rotating the freewheel body 19, that is, the rear wheel 3 by pulling the wire 16, is determined by the position at which the wire 16 engages with the outer peripheral surface of the freewheel body 19 as the pedal 8 is depressed. By changing from a large position to a small position from the center A, it changes from large to small. In other words, a large torque is generated when the pedal 8 starts to be depressed, and the generated torque gradually decreases as the pedal 8 is depressed. An effect that can be said is achieved.

Therefore, in a bicycle provided with such a rotary drive device 4, for example, on a flat road surface, the pedals 8 and
9 can be repeatedly operated in the lower position to rotate the rear wheel 3 with a small torque to increase the traveling speed. On a slope or the like, the pedals 8 and 9 can be repeatedly operated in the upper position to increase the torque. By turning the rear wheel 3, the pedal 8,
The stepping force of No. 9 can be reduced, and a comfortable uphill running can be performed.

In the above embodiment, the freewheel body 19 having a logarithmic linear curved surface is used as the freewheel body 19. However, the freewheel body 19 having an Archimedean linear curved surface may be applied. good.

In the above embodiment, the wire 16 is used as a cable connecting the pedals 8 and 9 and the freewheel body 19, and the wire 16 is connected to the V-shaped groove or the U-shaped groove 21 of the freewheel body 19. The freewheel body 19 is connected to the start point A of the freewheel body. However, a chain is used as a cable connecting the pedals 8, 9 and the freewheel body, while the freewheel body is connected to a gear. And the chain may be engaged with the teeth on the outer peripheral surface of the freewheel body.

FIG. 6 shows an example in which a freewheel body 26 having a curved surface in the shape of an Archimedean spiral is applied, and a chain 27 is used as a cable connecting the pedals 8, 9 and the freewheel body 26. An embodiment is shown in which the wheel main body 26 is constituted by gears (spiral gears), and the chain 27 is configured to engage with teeth on the outer peripheral surface of the freewheel main body 26. In this case, a mounting hole 26A for the rotary drive shaft 28 is formed at the rotation center A of the linear gear constituting the freewheel body 26.

The rotary drive shaft 28 is provided with a support portion 29 in which a bearing (not shown) for supporting the rotary drive shaft 28 and a ratchet are built in similarly to the rotary drive shaft 18 of the previous embodiment. I have. In addition, the support portion 29 is integrally provided with a pulley portion 30 for winding a mainspring constituting a return spring. Such a rotary drive shaft 2
8 is inserted into a mounting hole 26A at the center of rotation A of the wire gear constituting the freewheel body 26, and the outer peripheral surface of the support portion 29 is fixedly mounted on the inner peripheral surface of the mounting hole 26A.

On the other hand, one end of the mainspring constituting the return spring is fixedly attached to the outer peripheral surface of the return spring winding pulley 30 of the rotary drive shaft 28, and the other end is fixedly attached to the frame body 1. Although not shown, one end of the chain 27 is fixedly attached to the side portions of the pedals 8 and 9, and is wound around a gear rotatably supported on the frame body 1 via a shaft. Is engaged with the tooth portion of the outer peripheral surface of
(See FIG. 6B).

According to the freewheel of FIG. 6, since a linear gear having a linear shape of Archimedes is applied,
The initial rotation angle position can be changed by rotating the freewheel main body 26 by a predetermined angle to adjust the length of the chain 27 bridged between the freewheel 26 and the pedals 8 and 9, thereby reducing the initial torque. Can be changed.

Further, in the bicycle of the above embodiment, the large gear 13 is rotationally driven by the rotary driving device 4, and the rear wheel 3 is driven from the large gear 13 via the chain 14.
The rotation driving force is transmitted to the small gear 12 connected to the rotation driving shaft 3A, but the freewheel body is directly connected to the rotation driving shaft 3A of the rear wheel 3, and the rear wheel 3 is connected by the freewheel body. It may be directly driven to rotate (see FIGS. 7 and 8). Briefly describing this, as the freewheel, a linear gear having a linear shape of Archimedes is applied, and the freewheel main body 26 is directly connected to the rotary drive shaft 3A of the rear wheel 3, and the freewheel main body 26 The rear wheel 3 is directly driven to rotate, and can adjust the initial rotation position of the freewheel 26. In other words, the initial rotation angle position (torque) of the freewheel 26 can be changed by winding the wire 32 connected to the end of the chain 27 by the hoisting device 31. A suitable torque can be selected. 33 is a saddle.

Further, in the above embodiment, the wire 16 is operated by the repetitive linear movement of the pedals 8 and 9, but the pedal is repeatedly rocked to operate the rope such as the wire. Is also good.

Further, an example has been described in which the rotary drive device of the present invention is applied as a drive device for a bicycle. However, the rotary drive device of the present invention can be applied not only to bicycles but also to wheels and impellers in manually driven vehicles such as boats. In other words, the present invention can be used for rotationally driving an object such as a wheel in a health appliance or the like that improves leg strength by rotating only the wheel with a foot at a fixed position.

[0064]

As described above, according to the first aspect of the present invention, the freewheel main body is not a simple disk, but its peripheral surface gradually increases in distance from its central axis along the circumferential direction. Since it is formed to have a curved surface shape that continuously changes from small to large, the freewheel body, that is, the member that rotates or repetitively oscillates in the freewheel body by pulling the rope, that is, the torque for rotating the object. At different depth positions, it is possible to achieve an operation that can be said to be an automatic shift in which the shift is gradually performed by a change in the depth position of a member that performs repetitive linear motion or repetitive swinging motion.

According to the second aspect of the present invention, the main body of the freewheel can be easily formed into a desired curved shape by a helical curved surface, and the manufacturability is excellent.

According to the third aspect of the present invention, since the curved surface having a linear shape of Archimedes is applied, the freewheel body is rotated by a predetermined angle, and the freewheel and the freewheel repeatedly or linearly swing. The initial rotation angle position can be changed by adjusting the length of the cable spanned between the initial rotation angle and the initial torque.

According to the fourth aspect of the present invention, the freewheel body can have a simple pulley-like structure, and is excellent in manufacturability.

According to the fifth aspect of the present invention, a reliable turning power can be applied to the freewheel body, and the object can be reliably driven to rotate.

According to the invention of claim 6, a rotational driving force is applied to the object by the rotation of the freewheel pulled by the rope and the rotation by the elastic rotation urging force applied by the return spring. The operation is reliably performed by the ratchet mechanism, and the object can be reliably driven to rotate.

According to the seventh aspect of the invention, the torque for rotating the wheels of the manually driven vehicle can be varied, and the traveling performance of the manually driven vehicle can be improved.

According to the invention according to claims 8 and 9, the torque for rotating the wheels of the bicycle, for example, the rear wheels, can be varied. For example, on a flat road surface, the wheels are rotated with a small torque to increase the traveling speed. Can be on a slope, etc.
The running performance of the bicycle can be improved, for example, by turning the wheels with a large torque to reduce the operating force, thereby enabling easy climbing.

According to the tenth aspect of the present invention, the bicycle can be easily traveled by alternately repeating the alternately depressing operation of the left and right pedals and the alternately depressing operation. Further, since the left and right pedals are independent of each other, it is possible to freely adjust the pedal depression depth position (torque position).

According to the eleventh aspect of the present invention, it is easy to alternately depress the left and right pedals, and the fatigue of the driver can be suppressed. Also, on an uphill, the force component in the sliding direction applied to the pedal increases in accordance with the slope of the slope, and the stepping force of the driver is reduced.

According to the twelfth aspect of the invention, the rotation of the freewheel body is transmitted to the rear wheels by the rotation driving force transmission mechanism including the gears and the chain. , Can improve the running performance of the bicycle.

[0075]

[Brief description of the drawings]

FIG. 1 is a side view showing an entire embodiment of a bicycle according to the present invention to which an embodiment of the rotary driving device for an object according to the present invention according to the present invention is applied.

FIG. 2 is an enlarged side view of the rotary drive device according to the first embodiment;

FIG. 3 is a schematic view of a rotary drive device of the above.

FIG. 4 is an exploded perspective view of a freewheel.

FIG. 5 is a diagram showing a linear shape of a freewheel of the above.

FIG. 6 is a view showing another embodiment of the freewheel;
(A) is a plan view, (B) front view

FIG. 7 shows another embodiment of the bicycle.

FIG. 8 is a partially enlarged perspective view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame main body 3 Rear wheel 4 Rotation drive device 6, 7 Rail member 8 Left pedal 9 Right pedal 12 Small gear 13 Large gear 14 Chain 15 Freewheel 16 Wire 17 Spring spring 18 Rotation drive shaft 19 Freewheel body 20 Support part 26 Freewheel Main body 27 Chain 28 Rotation drive shaft 29 Supporting part 31 Hoisting device 32 Wire 33 Saddle

Claims (12)

[Claims] A freewheel that is rotated to rotate an object is provided.
A return spring for applying an elastic rotation biasing force in a direction opposite to the rotation direction of the object is provided, and a rope is laid between the freewheel and a member that performs a repetitive linear motion or a repetitive swinging motion, and the freewheel rope is provided. A rotation driving device that applies a rotation driving force to the object by the rotation of the freewheel, and the rotation of the freewheel by the elastic rotation urging force applied by the return spring. A curved surface is formed such that the distance from the shaft gradually changes from small to large along the circumferential direction, and an engaging portion with which the cable is engaged is formed on the circumferential surface. A rotary driving device for an object, wherein the cable is connected to a minimum portion of the peripheral surface from a central axis. 2. The apparatus according to claim 1, wherein the curved surface of the freewheel is a curved surface having a spiral shape. 3. The apparatus according to claim 2, wherein the spiral is a logarithmic spiral or an Archimedean spiral. 4. The cable according to claim 1, wherein the cable is a wire, and the engaging portion formed on the outer peripheral surface of the freewheel body is a V-shaped groove or a U-shaped groove with which the wire is engaged.
4. The rotation driving device for an object according to any one of items 3 to 3. 5. The cable according to claim 1, wherein the cable is a chain, and the engaging portion formed on the outer peripheral surface of the freewheel body is a tooth portion with which the chain is engaged. A rotary drive device for an object according to any one of the preceding claims. 6. The freewheel is provided at a freewheel body connected to the cable, a rotary drive shaft connected to an object, and a rotation center of the freewheel body, and the freewheel body is connected to the freewheel body. A support portion for supporting the rotary drive shaft, the rotary portion being engaged by the rope of the freewheel main body, the freewheel main body and the rotary drive shaft are engaged at the time of rotation, and the elastic rotation provided by the return spring. A support portion having a built-in ratchet mechanism for releasing engagement between the freewheel body and the rotation drive shaft when rotated by the biasing force;
The rotation drive device for an object according to any one of claims 1 to 3, characterized by comprising: 7. The apparatus according to claim 1, wherein the object is a wheel of a manually driven vehicle. 8. A bicycle comprising the rotary driving device for an object according to claim 1 as a rotary driving device for wheels. 9. The bicycle according to claim 8, wherein the bicycle is a two-wheeled vehicle having wheels respectively at the front and rear of the frame main body, and the rear wheels are rotationally driven by a rotary driving device. 10. The rotation drive device is provided independently on both sides of a frame body, and a pair of mutually parallel rail members extending in the vertical direction are provided on left and right sides of the frame body, respectively. The left pedal is slidably mounted on the pair of left rail members as a member that repeatedly moves linearly, and the right pedal is slidably mounted on the pair of right rail members as a member that repeatedly moves linearly. Each pedal and each freewheel body of the rotary driving device independently provided on both sides of the frame main body are connected by a rope, and a rope is bridged between the pedal and the rotary driving device. The bicycle according to claim 9, wherein the intermediate rotating body is mounted on the frame body and located. 11. The rail member is disposed in a forwardly inclined state in which an upper end position is located forward of a frame body than a lower end position, and the pedal is slid obliquely backward from above to below. The bicycle according to claim 10, wherein 12. A rotary driving force transmitting mechanism for transmitting a rotary driving force from a gear rotationally driven by the rotary driving device to a gear connected to a drive shaft of a rear wheel via a chain is provided. The bicycle according to any one of claims 8 to 10, which performs the following.