JP3140274U - Rotary gear type bicycle and its power transmission mechanism - Google Patents

Abstract

A bicycle capable of reducing the load when the pedal is depressed, transmitting the pedaling force efficiently to the rear wheel side, and traveling easily.
A crank arm with respect to the center of rotation of a sprocket 19 when the pedal is depressed by mounting a power transmission member 14 constructed by assembling an assembly plate 29, a rotating body holder 28 and a sprocket 19 to the bicycle. The actual effective crank arm length of 15 can be increased, and it can be rowed easily.
[Selection] Figure 3

Description

The present invention relates to a bicycle having a sprocket drive mechanism, and more particularly, to a bicycle equipped with a sprocket drive mechanism that can efficiently travel pedal depressing force to a drive wheel without fixing the sprocket to a drive shaft. .

  For example, as shown in Patent Document 1, a conventional bicycle drive mechanism is attached concentrically to a drive shaft by attaching a drive shaft to the other end of a crank arm having a pedal at one end so as to be integrally rotatable. The sprocket fixed to the shaft is driven to rotate, and the rear wheel is driven via a chain that is hung between the sprocket and the rotating shaft of the rear wheel.

In the sprocket shaft fixing mechanism described above, the force applied to the pedal is boosted by the ratio of the length of the pedal arm and the radius of the sprocket and becomes the driving force of the rear wheels.
Utility Model Registration No. 3049135

According to the sprocket drive mechanism as described above, when the pedal is stepped on, the most powerful pedaling force can be exerted when the pedal is pushed down in a state that is almost horizontal, just before the foot is fully extended. It is.
The pedal moves in a circle around the rotation axis of the crank arm, but there is a structural problem that the pedaling force is difficult to enter, and there is a demand for the emergence of a bicycle that can be raised more easily. However, since the pedaling force when the pedal is depressed is fixed by the ratio of the length of the pedal arm and the radius of the sprocket, there is a limit to increasing the outer diameter of the sprocket or increasing the length of the pedal arm. It was.

  On the other hand, bicycles have traditionally been equipped with a speed change control mechanism that reduces the burden on the rider by reducing the pedaling force on the pedal by decelerating when starting, climbing uphill, etc. The speed can be increased. Since this speed change control mechanism is configured to obtain the speed increasing / decreasing action by switching the meshing of a plurality of types of gears disposed in the speed change control mechanism, a time-consuming gear change operation is required. Yes.

  The present invention has been made in view of the above-mentioned problems, and reduces the load when the pedal is depressed and efficiently transmits the pedaling force to the rear wheel side without performing a special operation such as a gear change operation. An object of the present invention is to provide a rotary gear type bicycle that can be driven easily. It is another object of the present invention to provide a power transmission mechanism that modifies the conventional bicycle into the rotary gear bicycle simply by being attached to the conventional bicycle.

The present invention has been made to solve the above-mentioned problems. In the first embodiment of the present invention, a crankshaft is supported by a crank bearing provided on a hanger lug of a bicycle frame, and a pedal is provided at the end of the arm. The left and right crank arms are integrally attached to both ends of the crankshaft, and the rear wheel is driven by a drive chain wound between a sprocket driven and rotated by the rotation of the crank arm and a driven sprocket for the rear wheel. A rotating body holder in which one end side of the crankshaft is loosely inserted and is punctured in a point-symmetrical arrangement in the holder surface, and a rotating body that rotates freely is accommodated in each of a plurality of holes. , One end side of the crankshaft is loosely inserted, arranged on the surface side of the rotating body holder, and rotated at a front side connection point away from the center of the rotating body And an assembly plate connected to the crankshaft, the assembly plate is attached to a shaft support portion of one of the crank arms, and the sprocket is arranged to be loosely inserted at one end of the crankshaft on the back side of the rotating body holder. Connecting the front side of the sprocket and a back side connection point away from the center of each rotary body, separating the front side connection point and the back side connection point in each rotary body at a predetermined phase angle, and the driven sprocket The sprocket is held in a fixed position by the tension of the drive chain that is wound, and is eccentrically supported by the crankshaft and rotatably supported, and the rotation center of the sprocket and the center of the crankshaft This is a rotary gear type bicycle with an offset formed between them.
It is.

  According to a second aspect of the present invention, in the same bicycle as the first aspect, one end side of the crankshaft is loosely inserted, and each of the plurality of hole portions drilled in a point symmetrical arrangement in the holder surface is provided. A rotating body holder in which a plurality of rotating bodies that rotate freely and one end side of the crankshaft are loosely inserted, arranged on the surface side of the rotating body holder, and at a front side connection point away from the center of the rotating body An assembly plate coupled to each rotary body, and the assembly plate is attached to a shaft support portion of one of the crank arms, and the sprocket is loosely inserted on the back side of the rotary body holder on one end side of the crankshaft. And connecting the front side of the sprocket and the back side connection point away from the center of each rotating body, separating the front side connection point and the back side connection point in each rotating body at a predetermined phase angle, Front side Provide at least three knots and backside connection points, and rotate eccentrically with respect to the crankshaft while holding the sprocket in place by the tension of the drive chain wound around the driven sprocket And a rotary gear type bicycle in which an offset is formed between the rotation shaft center of the sprocket and the shaft center of the crankshaft.

  According to a third aspect of the present invention, in the same bicycle as the first or second aspect, a plurality of holes are formed in which one end side of the crankshaft is loosely inserted and drilled in a point-symmetrical arrangement in the holder surface. A rotating body holder in which a plurality of freely rotatable rotating bodies are housed, and one end side of the crankshaft is loosely inserted, arranged on the surface side of the rotating body holder, and away from the center of the rotating body An assembly plate coupled to each rotating body at a connection point, the assembly plate is attached to a shaft support portion of one of the crank arms, and the sprocket is attached to the back surface side of the rotating body holder on one end side of the crankshaft Are arranged by loose insertion, and the front side of the sprocket and the back side connection point away from the center of each rotary body are connected, and the front side connection point and the back side connection point in each rotary body are separated by a predetermined phase angle. Place and Due to the tension of the drive chain that is wound around the driven sprocket, the sprocket is held eccentrically and supported eccentrically by the crankshaft, and the rotation center of the sprocket and the center of the crankshaft It is a rotary gear type bicycle in which an offset is formed between the center of the shaft and the rotating body is supported in a freely swingable manner in the hole by a bearing member attached to the outer periphery of the rotating body.

  A fourth form of the present invention is the same bicycle as the first, second or third form, wherein one end side of the crankshaft is loosely inserted and drilled in a point-symmetric arrangement in the holder surface. In each of the holes, a rotating body holder in which a plurality of rotatable rotating bodies are arranged, and one end side of the crankshaft are loosely inserted and arranged on the surface side of the rotating body holder, from the center of the rotating body An assembly plate connected to each rotary body at a distant front-side connection point, and the assembly plate is attached to a shaft support portion of one of the crank arms, and the sprocket is attached to the back surface side of the rotary body holder. The front side of the sprocket and the back side connection point away from the center of each rotary body are connected, and the front side connection point and the back side connection point of each rotary body are set to a predetermined phase. Separation at the corner The crankshaft is provided with the crank arm integrally with the mounting position of the crankshaft, and the crankshaft is held in place by the tension of the drive chain wound around the driven sprocket. A rotary gear type bicycle that is eccentrically supported and rotatably supported, and an offset is formed between the rotation shaft center of the sprocket and the shaft center of the crankshaft.

  According to a fifth aspect of the present invention, in the same bicycle as any one of the first to fourth aspects, one end side of the crankshaft is loosely inserted, and a plurality of holes are formed in a point-symmetric arrangement in the holder surface. In each of the holes, a rotating body holder in which a plurality of rotatable rotating bodies are arranged, and one end side of the crankshaft are loosely inserted and arranged on the surface side of the rotating body holder, from the center of the rotating body An assembly plate connected to each rotary body at a distant front-side connection point, and the assembly plate is attached to a shaft support portion of one of the crank arms, and the sprocket is attached to the back surface side of the rotary body holder. The front side of the sprocket and the back side connection point away from the center of each rotary body are connected, and the front side connection point and the back side connection point of each rotary body are set to a predetermined phase. Separated by corner And location, the angle from the center of the rotary body said at different sides of the front connecting point and the rear connection point is a rotary gear type bicycles than 90 °.

  According to a sixth aspect of the present invention, in the same bicycle as in any one of the first to fifth aspects, one end side of the crankshaft is loosely inserted, and a plurality of holes are formed in a point-symmetric arrangement in the holder surface. In each of the holes, a rotating body holder in which a plurality of rotatable rotating bodies are arranged, and one end side of the crankshaft are loosely inserted and arranged on the surface side of the rotating body holder, from the center of the rotating body An assembly plate connected to each rotary body at a distant front-side connection point, and the assembly plate is attached to a shaft support portion of one of the crank arms, and the sprocket is attached to the back surface side of the rotary body holder. The front side of the sprocket and the back side connection point away from the center of each rotary body are connected, and the front side connection point and the back side connection point of each rotary body are set to a predetermined phase. Separated by corner And location, a rotary gear bicycle provided between the position at the top dead center with the pedal in the direction of 12 o'clock to the horizontal position.

According to a seventh embodiment of the present invention, a crankshaft is supported by a crank bearing provided on a hanger lug of a bicycle frame, and left and right crank arms each provided with a pedal at the tip of the arm are integrally attached to both ends of the crankshaft. In a bicycle in which a rear wheel is rotated by a drive chain wound between a sprocket driven and rotated by the rotation of the crank arm and a driven sprocket for a rear wheel, the bicycle is inserted into one end of the crankshaft. Thus, a rotary body holder in which a plurality of freely rotatable rotary bodies are accommodated in each of a plurality of holes formed in a point symmetrical arrangement in the holder surface, and the one end side of the crankshaft are loosely inserted. An assembly plate disposed on the surface side of the rotating body holder and connected to each rotating body at a front side connection point away from the center of the rotating body; The assembly plate is attached to the shaft support portion of one of the crank arms, the sprocket is disposed on the back side of the rotating body holder, the front side of the sprocket, and the back side away from the center of each rotating body It is a power transmission mechanism body of a rotary gear type bicycle in which a connection point is connected and the front side connection point and the back side connection point in each rotating body are separated and arranged at a predetermined phase angle.

  According to the first aspect of the present invention, the rotational movement of any one of the crank arms is transmitted to the sprocket disposed on the back side of the rotating body holder via the assembly plate and the rotating body holder, The front side connection point and the back side connection point in each rotating body are separated and arranged at a predetermined phase angle, and while holding the sprocket in place by the tension of the drive chain wound around the driven sprocket, The crankshaft is eccentric and can be rotatably supported, and an offset can be formed between the rotation axis center of the sprocket and the axis center of the crankshaft. A separation distance (deviation length) between the rotation axis center of the sprocket and the axis center of the crankshaft is referred to as an offset length. Since the torque for driving the bicycle is given by the effective crank arm length × the pedaling force, increasing the effective crank arm length by the offset length has the effect of increasing the torque by the offset length × the pedaling force even with the same pedaling force. The effect increases as the offset length is increased. That is, by forming this offset, the actual effective crank arm length of the crank arm with respect to the rotation center of the sprocket is increased when the pedal is depressed by the power transmission mechanism body including the assembly plate, the rotating body holder, and the sprocket. It is possible to provide a rotary gear type bicycle that can be rowed easily. Here, the reason why the bicycle according to the present invention is referred to as a rotary gear type bicycle is that the offset is forcibly formed in a conventional type bicycle by employing an interlocking mechanism between the rotating body holder and a sprocket (gear). Because it can. Therefore, only by incorporating this mechanism into a conventional bicycle, a torque equivalent to that of a conventional bicycle can be generated with a smaller pedaling force than in the past, in other words, a torque larger than that of the conventional bicycle can be generated with a pedaling force equivalent to the conventional bicycle. Is possible.

  According to the second embodiment of the present invention, as in the first embodiment, at least three or more front side connection points and back side connection points are provided, and the assembly plate, the rotating body holder, and the sprocket are included. With the power transmission mechanism, when the pedal is depressed, the actual effective crank arm length of the crank arm with respect to the rotation center of the sprocket can be increased, and a rotary gear bicycle that can be easily rowed can be provided.

  According to the third aspect of the present invention, as in the first or second aspect, the rotation center of the sprocket is turned on when the pedal is depressed by the power transmission mechanism including the assembly plate, the rotating body holder, and the sprocket. The actual effective crank arm length of the crank arm with respect to the rotating body can be increased, and the rotating body can be freely rotated in the hole by a bearing member attached to the outer periphery of the rotating body to smoothly rotate the crank arm. It is possible to provide a rotary gear type bicycle in which force can be transmitted to the sprocket to easily pedal.

  According to the fourth form of the present invention, when the pedal is depressed, the sprocket is driven by the power transmission mechanism comprising the assembly plate, the rotating body holder and the sprocket, as in the first, second or third form. The actual effective crank arm length of the crank arm relative to the rotation center of the crank arm can be increased, and the assembly plate is provided integrally with the crank shaft mounting portion of the crank arm, thereby reducing the number of components and simplifying. A rotary gear type bicycle that can be rowed easily can be realized with a simplified configuration.

  According to the fifth aspect of the present invention, in the same manner as in any one of the first to fourth aspects, when the pedal is depressed, the sprocket is driven by the power transmission mechanism including the assembly plate, the rotating body holder, and the sprocket. The actual effective crank arm length of the crank arm with respect to the rotation center of the rotating body can be increased, and the front side connecting point and the back side connecting point are made different from each other so that the angle from the center of the rotating body is 90 ° or more. Therefore, it is possible to provide a bicycle that can efficiently transmit pedaling force when the pedal is depressed and can be easily pedaled.

  According to the sixth aspect of the present invention, in the same manner as in any one of the first to fourth aspects, when the pedal is depressed, the sprocket is driven by the power transmission mechanism including the assembly plate, the rotating body holder, and the sprocket. The actual effective crank arm length of the crank arm with respect to the center of rotation can be increased, and the pedal is provided between the position of the top dead center in the 12 o'clock direction and the horizontal position so that the pedal is depressed. It is possible to provide a bicycle that can efficiently transmit the pedaling force of the vehicle and can be pedaled easily.

  According to a seventh aspect of the present invention, the rotation center of the sprocket is depressed when the pedal is depressed by assembling a power transmission mechanism body comprising the assembly plate, the rotating body holder and the sprocket according to the present embodiment to a conventional bicycle. The actual effective crank arm length of the crank arm can be increased, and the conventional bicycle can be converted to a rotary gear type bicycle that can be easily rowed. In other words, the drive sprocket of the conventional bicycle is removed, the power transmission mechanism of this embodiment is mounted, the chain of the conventional bicycle is slightly shortened, and this chain is wound around the sprocket of the power transmission mechanism By simply doing this, the offset length detailed in the first embodiment can be set. As a result, the effective crank arm length can be increased by the offset length, and all the effects described in the first embodiment can be exhibited in the conventional bicycle. Moreover, if the further limited component described in each of said 2nd form-said 6th form is added to the power transmission mechanism body which concerns on this 7th form, a conventional bicycle will be said 2nd form-said 6th. Needless to say, the rotary gear type bicycle can be modified.

  FIG. 1 shows a bicycle as an embodiment of the present invention. The frame of the bicycle includes a front fork 4 on the front wheel 1 side and a back fork 11 on the rear wheel 2 side. An upper end of the front fork 4 is connected to a handle post 7, and a handle 8 is attached to the handle post 7. The upper end of the lower pipe 5 is connected to the connecting portion of the front fork 4 with the handle post 7. The upper end of the back fork 11 is connected to a seat post 9, and a saddle 10 is attached to the seat post 9. The base pipes of the handle post 7 and the seat post 9 are connected by the main pipe 3. The upper end of the standing pipe 6 is connected to the connecting portion of the back fork 11 with the saddle 10. The lower end of the back fork 11 is connected to the bearing portion 21 for the rear wheel 2. A rotatable driven sprocket is attached to the bearing portion 21, and the driven sprocket is covered with a storage cover 22.

  Lower ends of the lower pipe 5 and the standing pipe 6 are connected by a hanger lug 13. A pair of chain stays 12 are connected between the hanger lug 13 and the rear wheel 2 bearing portion 21. The hanger lug 13 is composed of a crank bearing portion described later. A pair of crank arms 15 and 16 are symmetrically attached to both ends of a crankshaft 23, which will be described later, pivotally supported by the crank bearing portion. Pedals 17 and 18 are attached to the open ends of the crank arms 15 and 16, respectively. The power transmission member 14 according to the present invention is attached to one crank arm 15 of the hanger lug 13. The power transmission member 14 includes a drive side sprocket 19, and a chain 20 is wound between the drive side sprocket 19 and the driven side sprocket.

  FIG. 2 shows the structure of the hanger lug 13. The hanger lug 13 includes a crank portion 13A through which the crankshaft is inserted, and pipe receiving portions 13B, 13C, 13D, and 13E formed in a four-pronged shape with respect to the outside of the crank portion 13A. End portions of the lower pipe 5, the standing pipe 6, and the chain stays 12 and 12 are inserted into the pipe receiving portions 13B, 13C, 13D, and 13E, respectively.

  FIG. 3 shows the configuration of the power transmission member 14 attached to the crank arm 15. A crankshaft 23 is pivotally supported on the hanger lug 13. Crank arms 15 and 16 are attached to both ends of the crankshaft 23. The crank arm 16 on which the power transmission member 14 is not disposed is fixed to one end of the crankshaft 23 by a boss portion 16A. The rotating shaft 18A of the pedal 18 is fastened by a tightening nut 16B at the open end of the crank arm 16, and the rotating shaft of the pedal 17 is also fastened by the open end of the crank arm 15. Yes.

  The hanger lug 13 has an intermediate pipe 24 fixed to the inside of the crank portion 13A by welding or the like. Screw portions 25 are screwed on the inner periphery of both ends of the middle pipe 24. In a state where a large number of balls 27 are held by grease or the like from a pair of annular projections 23C provided at an intermediate portion of the crankshaft 23, a large number of balls 27 are provided by ball bearings 26 that are screwed into the screw portions 25. Is pressed to form a ball bearing portion, and the crankshaft 23 is supported on the hanger lug 13 by the ball bearing portion.

  At the end of the crankshaft 23 on the side of the crank arm 15, an extension 23 </ b> B is provided so as to extend in excess of the side of the crank arm 16 for insertion of the power transmission member 14. The boss 15A of the crank arm 15 is fastened to the taper angle shaft 23A at the tip of the extension 23B by a tightening nut 15B.

  4 to 7 show each part of the power transmission member 14. The power transmission member 14 is disposed on the surface side of the rotating body holder 28, with the rotating body holder 28 into which the extension 23 </ b> B on one end side of the crankshaft 23 is loosely inserted and the extending section 23 </ b> B on one end side of the crankshaft is loosely inserted. The assembly plate 29, a rotatable rotating body 35 that is formed in a point-symmetrical arrangement in the holder surface of the rotating body holder 28, and that is rotatably accommodated in each of the plurality of holes 28 A, and is connected to the rotating body 35. And a torque transmission mechanism for efficiently transmitting rotational torque from the drive side sprocket 19 to the driven side sprocket via the chain 20.

  FIG. 4 is a plan view of the assembly plate 29. The assembly plate 29 is connected to each rotary body 35 of the rotary body holder 28 by an input crimp 33. A through hole 29 </ b> A for loosely inserting the crankshaft 23 is opened at the center of the assembly plate 29 so as not to contact the crankshaft 23. A fixed portion 15C extending in four directions is extended on the outer periphery of the boss portion 15A of the crank arm 15, and the boss portion 15 and the assembly plate 29 are attached to the assembly plate 29 corresponding to each fixed portion 15C via a spacer 31. The fixing screw holes 29B are fixed at four places by the fastening screws 15D. Six connecting holes 29C are formed on the outer peripheral side of the fixing screw holes 29B of the assembly plate 29, and the input caulking 33 is inserted into each connecting hole 29C and each rotating body 35 of the rotating body holder 28, and the caulking is fixed. Thus, each rotating body 35 is fixed and connected to the assembly plate 29. As shown in FIG. 4, the arrangement angle A <b> 1 between the connecting hole 29 </ b> C positioned between the fixing screw holes 29 </ b> B and one fixing screw hole 29 </ b> B is set to 45 ° with respect to the center of the assembly plate 29. Further, the six connecting holes 29C are arranged symmetrically with respect to the center line along the side formed between the pair of fixing screw holes 29B, and the connecting holes 29C provided near the center line are Located at an angle A2 of 30 ° with respect to the center line. The arrangement angle between the connecting hole 29C located between the fixing screw holes 29B and the one fixing screw hole 29B is set to 45 ° with respect to the center of the assembly plate 29.

  FIG. 5 is a plan view of the rotating body holder 28. As in the case of the assembly plate 29, a through hole 28 </ b> B for loosely inserting the crankshaft 23 is opened at the center of the rotating body holder 28 so as not to contact the crankshaft 23. Six holes 28A for accommodating the rotating body 35 are formed around the through hole 28B. A rotating body 35 is accommodated in each hole 28 </ b> A so as to rotate freely, and six rotating bodies 35 are arranged symmetrically around the center of the rotating body holder 28. A ball rolling groove 28C is formed in the inner periphery of the hole 28A.

  FIG. 6 shows an AA cross section of the rotating body 35 of FIG. The rotator 35 is made of a disc having the same thickness as that of the rotator holder 28, and a ball rolling groove 35A is formed on the periphery of the disc. A through-hole 35C is formed in the center of the rotating body 35 to reduce the weight. The ball 34 is mounted on the outer peripheral groove formed by the ball rolling groove 28C and the ball rolling groove 35A in a state where the rotating body 35 is accommodated in the hole 28A, so that the rotation of the rotating body 35 is smooth. Constructs a ball bearing structure. The mounting of the ball 34 is performed by press-fitting from an introduction port (not shown) provided in the ball rolling groove 28C. Each rotary body 35 is formed with an insertion hole 35 </ b> B for an input crimp 33 and is connected to the assembly plate 29 by the input crimp 33 on the front side of the rotary holder 28. Each rotary body 35 has an insertion hole 35D formed at a position shifted by a phase angle A3 from the insertion hole 35B, and is connected to the sprocket 19 by an output caulking 32 on the back side of the rotary body holder 28.

  FIG. 7 shows the sprocket 19 mounted on the back side of the rotating body holder 28. At the center of the sprocket 19, a large through hole 19 </ b> B for loosely inserting the crankshaft 23 is opened, and the entire sprocket has a donut shape in which a chain engagement portion 19 </ b> C is provided. Six insertion holes 19A for the output caulking 32 are formed around the through hole 19B in a point-symmetric manner with respect to the center of the donut. The sprocket 19 is connected to the rotating body holder 28 by an output caulking 33 inserted through the insertion hole 35D of the rotating body 35 and the insertion hole 19A. The output crimp 33 passes through a spacer 30 interposed between the sprocket 19 and the rotating body holder 28. By inserting the spacer 30, the chain 20 wound around the sprocket 19 is prevented from coming into contact with the rotating body holder 28.

FIG. 8 shows an assembled state in which the assembly plate 29, the rotating body holder 28 and the sprocket 19 are caulked and connected by the input caulking 33 and the output caulking 32, and is a view seen from the front side of the rotating body holder 28.
FIG. 9 shows the assembled state of the assembly plate 29, the rotating body holder 28 and the sprocket 19, and is a view seen from the back side of the rotating body holder 28.

  The power transmission member 14 according to the present invention is configured by assembling the assembly plate 29, the rotating body holder 28, and the sprocket 19 as described above. Although the assembly plate 29 is used as a connection auxiliary member between the rotating body holder 28 and the crank arm 15, the boss portion 15A of the crank arm 15 and the assembly plate 29 may be integrated.

  In a free state in which the chain 20 is not suspended from the sprocket 19, the sprocket 19 circulates around the axis of the crankshaft 23 along with the rotation of each rotating body 35 of the rotating body holder 28. On the other hand, when the chain 20 is suspended between the sprocket 19 and the driven sprocket, when the sprocket 19 is constrained along the pulling direction of the chain 20, the rotor holder 28 circulates around the sprocket 19 in appearance. It will be. At this time, since the rotational torque of the rotating body holder 28 is applied to the sprocket 19 by the circular motion, it is converted into the rotational motion of the sprocket 19. The rotation of the sprocket 19 acts as a pulling force on the chain 20 suspended on the driven sprocket, and power is transmitted to the driven sprocket.

According to the power transmission member 14, the sprocket 19 rotates while the circumferential movement in the free state is restrained by the pulling force of the chain 20 and the back-and-forth movement is suppressed as the crank arm 15 rotates. Therefore, the eccentric amount (hereinafter referred to as offset) D between the axis of the crankshaft 23 and the sprocket 19 formed in the free state is always maintained in the constrained state.
In bicycle driving, when the pedal 17 is at the top dead center in the 12 o'clock direction, the load on the rider is maximized, and when the pedal 17 is depressed from the top dead center to the horizontal direction in the 3 o'clock direction, power transmission is performed. Is possible. According to the power transmission member 14, in this stepping-in process, there is an offset between the axis of the crankshaft 23 and the sprocket 19, so that the crank arm length of the crank arm 15 is substantially extended. The extension will reduce the load and reduce the pedal effort, so you can travel comfortably.

The offset effect in the power transmission member 14 will be described using the model drive mechanism of FIG.
FIG. 10 shows a model mechanism schematically showing the power transmission member 14 for explaining the offset effect. An elliptical connection plate 105 is fixed to a shaft 102 of the left and right crank arms 100 and 101 to which a pedal is attached at the tip by a connection member 104. The connecting plate 105 and the connecting member 104 correspond to the rotating body holder 28 and the assembly plate 29, respectively. Two connecting portions 106 of the connecting plate 105 by the connecting member 104 are arranged on the elliptical long axis. In the center of the connecting plate 105, an opening 103 for loosely inserting the crankshaft is formed. A sprocket 107 is disposed on the back side of the connecting plate 105. The sprocket 107 and the connection plate 105 are connected by a connection member 104. The connecting member 104 corresponds to the rotating body 35, is connected to the connecting plate 105 at a connecting point P3, and is connected to the sprocket 107 at a connecting point P4. The connection points P3 and P4 correspond to the input crimp 33 and the output crimp 32, respectively. In this model mechanism, in order to simplify the mechanism, a pair of connecting members 104 and 104 are arranged symmetrically on the connecting portion 106 side of the connecting plate 105. The sprocket 107 is in a restrained state in which a chain is wound, and the center of the sprocket forms an offset D1 with respect to the axis 102 of the crank arms 100, 101.

  Using the model drive mechanism, the trajectory of the pedal tip as viewed from the center of the sprocket shaft was examined under the condition that the input pedaling force F to the crank pedal was constant and the crank rotation speed was also constant. Further, the relationship between the force point at which the force is transmitted to the sprocket 107 via the connecting plate 105 and the angular velocity was examined and compared with the conventional mechanism. In the transmission of the force in the model drive mechanism, the pedal force F applied to the tip P1 of the crank arm 100 is first transmitted to the connection plate 105 via the connection point P2 of the connection point 106, and each of the connection members 104 is further transmitted. This is performed by being transmitted to the sprocket 107 through the connection points P3 and P4.

  FIG. 11 shows the locus of each part with respect to the crank angle ωt in the conventional bicycle drive mechanism. The vertical axis represents the displacement and torque change of the sprocket 200 and pedal 201, and the horizontal axis represents the change of the crank angle ωt. When the conventional sprocket 200 is attached coaxially with the crank arm, the trajectories F1 and F2 of the pedal 201 and the trajectory F4 of the sprocket 200 draw a sine wave, and the torque trajectory F3 is also constant.

  FIG. 12 shows the locus of each part with respect to the crank angle ωt in the drive mechanism of FIG. The vertical axis shows the displacement of the sprocket 107 and the pedal and the torque change, and the horizontal axis shows the change of the crank angle ωt. In the drive mechanism of FIG. 10, the sprocket 107 is not coaxial with the axis 102 of the crank arm 100 but is eccentric and provided with an offset D1, and the trajectory F5 of the sprocket draws a gentle sine wave. The pedal trajectory F6 has a waveform slightly deviated from the sine wave of FIG. The torque trajectory F7 on the stepping side is a gentle trajectory curve, and the torque trajectory on the pulling foot side is a trajectory curve F8 that is slightly steep on the stepping side. Although the driving on the pulling side is a little heavy, the normal driving is mainly depressing, so there is little impact. According to the drive mechanism shown in FIG. 10, since the torque trajectory F7 on the depression side is gentle, the angular velocity dω / dt becomes small.

  If the distance from the axial center 102 of the left and right crank arms 100 and 101 to the open end of the crank arm, that is, the crank arm length is r, and the stepping force F applied to the pedal is F, the crank arm in the conventional case of FIG. The torque T generated in the sprocket 107 with the rotation of is represented by T = F × r. If r is J, the torque T is T = J × (dω / dt). Therefore, as shown in FIG. 10, the distance L from the center of the sprocket 107 to the open end of the crank arm becomes longer by the offset D1 (> r), and the above-mentioned step-side torque locus F7 becomes a gentle locus curve. Appears. As can be seen from the model drive mechanism of FIG. 10, according to the power transmission member 14 according to this embodiment that embodies this, when the pedal is depressed, the actual effective crank arm length of the crank arm 15 with respect to the rotation center of the sprocket 19 is set. A bicycle that can be enlarged and can be rowed easily can be provided. In the case of FIG. 10, when the magnitude of the offset D1 is about 2/9 of the effective crank arm length, the input pedaling force is reduced by about 12.5%, and the propulsive force during traveling is increased by 12.5%. be able to. In addition, when the relative angle between the connecting plate 105 and the crank arm 100, that is, the angle formed by the connecting point P2 of the connecting plate 105 with respect to the vertical direction is 45 °, the angular velocity at which the pedal force can be transmitted most is obtained.

  The present invention is not limited to the above-described embodiment and examples, and various modifications and design changes within the technical scope of the present invention are included in the technical scope. Not too long.

  The bicycle power transmission mechanism according to the present invention can realize a sprocket self-propelled vehicle that can be easily raised, and can be used in fields such as bicycles and wheelchairs.

1 is an overall configuration diagram of a bicycle according to an embodiment of the present invention. It is an external view of the hanger lug 13 in the said embodiment. It is a fragmentary sectional view showing composition of power transmission member 14 concerning the embodiment. 4 is a plan view of an assembly plate 29 of the power transmission member 14. FIG. 4 is a plan view of a rotating body holder 28 of the power transmission member 14. FIG. It is AA sectional drawing of the rotary body 35 of FIG. 3 is a plan view of a drive-side sprocket 19 of the power transmission member 14. FIG. 3 is a plan view of the assembled state of the power transmission member 14 as viewed from the front side of the rotating body holder 28. FIG. 4 is a plan view of the assembled state of the power transmission member 14 as viewed from the back side of the rotating body holder 28. FIG. It is a figure which shows the model drive mechanism which showed the power transmission member 14 typically, and although the curved crank arm is shown in figure, it cannot be overemphasized that it is the same also in the linear crank arm of FIG. It is a figure which shows the locus | trajectory of each part with respect to crank angle (omega) t in the conventional bicycle drive mechanism. It is a figure which shows the locus | trajectory of each part with respect to crank angle (omega) t in the model drive of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front wheel 2 Rear wheel 3 Main pipe 4 Front fork 5 Lower pipe 6 Vertical pipe 7 Handle post 8 Handle 9 Seat post 10 Saddle 11 Back fork 12 Chain stay 13 Hanger lug 13A Crank part 13B Pipe receiving part 13C Pipe receiving part 13D Pipe receiving Part 13E Pipe receiving part 14 Power transmission member 15 Crank arm 15A Boss part 15B Clamping nut 15C Clamping part 15D Clamping screw 16 Crank arm 16A Boss part 16B Clamping nut 17 Pedal 18 Pedal 18A Rotating shaft 19 Drive side sprocket 20 Chain 21 Bearing portion 22 Storage cover 23 Crankshaft 23A Taper angle shaft 23B Extension portion 23C Protrusion 24 Middle pipe 25 Screw portion 26 Ball bearing 27 Ball 28 Rotating body holder 28A Hole portion 28B Through hole 28C Groove 29 Assembly plate 9A Through hole 29B Fixing screw hole 29C Connecting hole 30 Spacer 31 Spacer 32 Output caulking 33 Input caulking 34 Ball 35 Rotating body 35A Groove 35B Inserting hole 35C Through hole 35D Phase angle 100 Crank arm 101 Crank arm 102 Axis center 103 Opening 104 Connection member 105 Connection plate 106 Connection location 107 Sprocket 200 Sprocket 201 Pedal A1 Angle A2 Angle D Offset D1 Offset F1 Path F2 Path F3 Path F4 Path F5 Path F6 Path F7 Path F8 Path P1 Connection point P2 Connection point P3 Connection point P4 Connection point ωt crank angle

Claims (7)

The crankshaft is supported by a crank bearing provided on the hanger lug of the bicycle frame, and the left and right crank arms, each provided with a pedal at the tip of the arm, are integrally attached to both ends of the crankshaft. In a bicycle in which a rear wheel is rotated by a drive chain wound between a sprocket to be driven and a driven sprocket for the rear wheel, one end side of the crankshaft is loosely inserted and drilled in a point-symmetrical arrangement in the holder surface. In each of the plurality of holes, a rotating body holder in which a plurality of freely rotatable rotating bodies are accommodated, and one end side of the crankshaft are loosely inserted, arranged on the surface side of the rotating body holder, An assembly plate connected to each rotating body at a front side connection point away from the center of the rotating body, and the shaft support of one of the crank arms The assembly plate is attached to the rotating body holder, and the sprocket is disposed on one side of the crankshaft on the back surface side of the rotating body holder, and the front side of the sprocket and a backside connection point away from the center of each rotating body, The front-side connection point and the back-side connection point of each rotating body are separated and arranged at a predetermined phase angle, and the sprocket is held in place by the tension of the drive chain wound around the driven sprocket. However, the rotary gear type bicycle is characterized in that the crankshaft is eccentrically supported and is rotatably supported, and an offset is formed between the rotation axis center of the sprocket and the axis center of the crankshaft. The crankshaft is supported by a crank bearing provided on the hanger lug of the bicycle frame, and the left and right crank arms, each provided with a pedal at the tip of the arm, are integrally attached to both ends of the crankshaft. In a bicycle in which a rear wheel is rotated by a drive chain wound between a sprocket to be driven and a driven sprocket for the rear wheel, one end side of the crankshaft is loosely inserted and drilled in a point-symmetrical arrangement in the holder surface. In each of the plurality of holes, a rotating body holder in which a plurality of freely rotatable rotating bodies are accommodated, and one end side of the crankshaft are loosely inserted, arranged on the surface side of the rotating body holder, An assembly plate connected to each rotating body at a front side connection point away from the center of the rotating body, and the shaft support of one of the crank arms The assembly plate is attached to the rotating body holder, and the sprocket is disposed on one side of the crankshaft on the back surface side of the rotating body holder, and the front side of the sprocket and a backside connection point away from the center of each rotating body, The front side connection point and the back side connection point in each rotating body are separated and arranged at a predetermined phase angle, and at least three or more of the front side connection points and the back side connection points are provided and wound around the driven sprocket. The sprocket is held in a fixed position by the tension of the drive chain, and is eccentrically supported by the crankshaft and is rotatably supported. Between the rotation center of the sprocket and the center of the crankshaft A bicycle characterized by forming an offset. A rotary gear type bicycle characterized by this. The crankshaft is supported by a crank bearing provided on the hanger lug of the bicycle frame, and the left and right crank arms, each provided with a pedal at the tip of the arm, are integrally attached to both ends of the crankshaft. In a bicycle in which a rear wheel is rotated by a drive chain wound between a sprocket to be driven and a driven sprocket for the rear wheel, one end side of the crankshaft is loosely inserted and drilled in a point-symmetrical arrangement in the holder surface. In each of the plurality of holes, a rotating body holder in which a plurality of freely rotatable rotating bodies are accommodated, and one end side of the crankshaft are loosely inserted, arranged on the surface side of the rotating body holder, An assembly plate connected to each rotating body at a front side connection point away from the center of the rotating body, and the shaft support of one of the crank arms The assembly plate is attached to the rotating body holder, and the sprocket is disposed on one side of the crankshaft on the back surface side of the rotating body holder, and the front side of the sprocket and a backside connection point away from the center of each rotating body, The front-side connection point and the back-side connection point of each rotating body are separated and arranged at a predetermined phase angle, and the sprocket is held in place by the tension of the drive chain wound around the driven sprocket. However, the crankshaft is eccentrically supported and rotatably supported, and an offset is formed between the rotation shaft center of the sprocket and the shaft center of the crankshaft. A rotary gear type bicycle characterized in that a rotating body is rotatably supported in the hole. The crankshaft is supported by a crank bearing provided on the hanger lug of the bicycle frame, and the left and right crank arms, each provided with a pedal at the tip of the arm, are integrally attached to both ends of the crankshaft. In a bicycle in which a rear wheel is rotated by a drive chain wound between a sprocket to be driven and a driven sprocket for the rear wheel, one end side of the crankshaft is loosely inserted and drilled in a point-symmetrical arrangement in the holder surface. In each of the plurality of holes, a rotating body holder in which a plurality of freely rotatable rotating bodies are accommodated, and one end side of the crankshaft are loosely inserted, arranged on the surface side of the rotating body holder, An assembly plate connected to each rotating body at a front side connection point away from the center of the rotating body, and the shaft support of one of the crank arms The assembly plate is attached to the rotating body holder, and the sprocket is disposed on one side of the crankshaft on the back surface side of the rotating body holder, and the front side of the sprocket and a backside connection point away from the center of each rotating body, The front-side connection point and the back-side connection point in each rotating body are separated and arranged at a predetermined phase angle, the assembly plate is provided integrally with the crankshaft mounting location, and the driven sprocket The sprocket is held in a fixed position by the tension of the drive chain that is wound, and is eccentrically supported by the crankshaft and rotatably supported, and the rotation center of the sprocket and the center of the crankshaft A rotary gear type bicycle characterized by forming an offset between them. The crankshaft is supported by a crank bearing provided on the hanger lug of the bicycle frame, and the left and right crank arms, each provided with a pedal at the tip of the arm, are integrally attached to both ends of the crankshaft. In a bicycle in which a rear wheel is rotated by a drive chain wound between a sprocket to be driven and a driven sprocket for the rear wheel, one end side of the crankshaft is loosely inserted and drilled in a point-symmetrical arrangement in the holder surface. In each of the plurality of holes, a rotating body holder in which a plurality of freely rotatable rotating bodies are accommodated, and one end side of the crankshaft are loosely inserted, arranged on the surface side of the rotating body holder, An assembly plate connected to each rotating body at a front side connection point away from the center of the rotating body, and the shaft support of one of the crank arms The assembly plate is attached to the rotating body holder, and the sprocket is disposed on one side of the crankshaft on the back surface side of the rotating body holder, and the front side of the sprocket and a backside connection point away from the center of each rotating body, The front side connection point and the back side connection point in each rotary body are separated and arranged at a predetermined phase angle, and the front side connection point and the back side connection point are made different from each other so that the angle from the center of the rotary body is A rotary gear type bicycle characterized by being 90 ° or more. The crankshaft is supported by a crank bearing provided on the hanger lug of the bicycle frame, and the left and right crank arms, each provided with a pedal at the tip of the arm, are integrally attached to both ends of the crankshaft. In a bicycle in which a rear wheel is rotated by a drive chain wound between a sprocket to be driven and a driven sprocket for the rear wheel, one end side of the crankshaft is loosely inserted and drilled in a point-symmetrical arrangement in the holder surface. In each of the plurality of holes, a rotating body holder in which a plurality of freely rotatable rotating bodies are accommodated, and one end side of the crankshaft are loosely inserted, arranged on the surface side of the rotating body holder, An assembly plate connected to each rotating body at a front side connection point away from the center of the rotating body, and the shaft support of one of the crank arms The assembly plate is attached to the rotating body holder, and the sprocket is disposed on one side of the crankshaft on the back surface side of the rotating body holder, and the front side of the sprocket and a backside connection point away from the center of each rotating body, The front side connection point and the back side connection point in each rotating body are separated and arranged at a predetermined phase angle, and the pedal is provided between the position at the top dead center in the 12 o'clock direction and the horizontal position. A rotary gear type bicycle characterized by that. The crankshaft is supported by a crank bearing provided on the hanger lug of the bicycle frame, and the left and right crank arms, each provided with a pedal at the tip of the arm, are integrally attached to both ends of the crankshaft. In a bicycle in which a rear wheel is rotated by a drive chain wound between a sprocket to be driven and a driven sprocket for a rear wheel, it is loosely inserted on one end side of the crankshaft and is point-symmetric in the holder surface A rotating body holder in which a plurality of freely rotatable rotating bodies are accommodated in each of a plurality of holes formed in the arrangement, and the one end side of the crankshaft are loosely inserted, and the surface of the rotating body holder An assembly plate that is disposed on the side and connected to each rotating body at a front-side connection point that is distant from the center of the rotating body. The assembly plate is attached to the shaft support of the rank arm, and the sprocket is disposed on the back side of the rotating body holder, and the front side of the sprocket is connected to the back side connecting point away from the center of each rotating body. A power transmission mechanism body for a rotary gear type bicycle, wherein the front side connection point and the back side connection point in each rotating body are separated and arranged at a predetermined phase angle.

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