JP2008149751A - Running driving device for bicycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a running driving device for a bicycle capable of increasing running torque at the time of running of a bicycle, and reducing weight with a simple structure. <P>SOLUTION: A running torque increasing mechanism 1 is provided with a circular fixed plate 5 attached in a frame 4 between the frame 4 and a chain gear 3 with its surface in parallel with the surface of rotation of the chain gear 3 while having a position offset from the rotary shafts P2, P3 of the chain gear 3 as a center point P1, a rotating ring 7 arranged in the periphery of the fixed plate 5 via a bearing 6 and rotating around the center point P1 of the fixed plate 5 with a form involving the rotary shafts P2, P3 of the chain gear 3, a cut groove 8 formed in the chain gear 3, and a connecting boss 9 passing through the cut groove 8 and combining the rotating ring 7 and the free end of a crank arm 2 on the opposite side of a pedal 10. At the time of rotation of the crank arm 2, the rotating ring 7 is rotated in the periphery of the fixed plate 5 via the connecting boss 9 moving corresponding to this. The chain gear 3 is thus driven with the connecting boss 9 being slid in the cut groove 8 of the chain gear 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a travel drive device that increases rotational torque acting on a chain gear of a bicycle.

The present applicant has created the invention described in Patent Document 1 as a traveling drive device for a bicycle that reduces the depressing force of a pedal provided on a crank arm of the bicycle, and is known. In the technique described in Patent Document 1, a chain gear is rotatably attached to the outer periphery of an eccentric disk fixed to a frame member via a ball bearing, while the crank is fixed to the eccentric disk at a position offset from the center point of the eccentric disk. A rotary shaft is inserted and fixed, and an operation panel is fixed to the rotation shaft, and the operation panel is coupled to the chain gear via a link member. As a result, when the pedal is depressed, the crank arm is rotated, and the rotating shaft is driven, the operation panel rotates in conjunction with the rotation. When the rotational force of the operating panel is transmitted to the link member, the chain hole rotates around the stay member arranged at the center point of the eccentric disk. In this way, when the rotational torque of the crank that rotates by depressing the pedal drives the chain gear that is rotatably provided on the outer periphery of the eccentric disc via the link member, the rotational torque is applied to the chain gear in an increased manner. be able to. As a result, it is possible to run the bicycle in a manner in which the rotational torque is increased without increasing the length of the crank arm.
Japanese Patent Laid-Open No. 7-223578

  However, in the technique of the above-mentioned Patent Document 1, a plurality of refractable link members formed by pin coupling between the operation panel and the chain hole are provided along the circumference to rotate the rotating shaft of the crank. Since the mechanism that increases the rotational torque is composed of various components, the structure is complicated, the total weight of the bicycle increases, and labor is required for traveling. is there.

  The present invention has been made by paying attention to the above technical problem, and by using a rotary slider mechanism in a bicycle travel drive device, the rotational torque can be increased during bicycle travel, and the structure is simple. An object of the present invention is to provide a bicycle drive device that can reduce the weight.

  In order to achieve the above object, the invention of claim 1 is a bicycle travel drive device, comprising: a chain gear rotatably provided on a bicycle frame; and a crank arm rotated by stepping on a pedal, In the bicycle drive device provided with the rotational torque increasing mechanism, the rotational torque increasing mechanism is attached to the frame between the frame and the chain gear, and the surface thereof is mounted in parallel with the rotational surface of the chain gear, and A fixed plate having a circular shape centered at a position offset from the rotation axis of the chain gear, and a fixed plate provided in a form surrounding the rotation shaft of the chain gear with a bearing provided on the outer periphery of the fixed plate. A rotating ring that rotates around the center point of the shaft, a kerf formed in the chain gear, and a slide slidably provided in the kerf. Characterized by comprising a connecting boss for coupling the fine said crank arm.

  In the invention of claim 1, a so-called rotary slider mechanism is used for the rotational torque increasing mechanism, in other words, a crank arm provided with a pedal, a rotary ring, and a gap between the rotary ring and the crank arm. A rotation torque increasing mechanism including a connecting boss provided, a kerf formed in the chain gear so as to guide a movement trajectory of the linking boss, and the chain gear having the kerf; That is, the crank arm is integrally coupled to the rotating ring via the connecting boss. That is, the center of rotation of the crank arm serves as the center point of the stationary platen that rotatably supports the rotating ring, and therefore the arm of the crank arm rotational moment is the length to the center point of the stationary platen. Therefore, when the crank arm rotates, the rotating ring rotates around the fixed platen around the center point of the fixed platen via the connecting boss. At this time, since the connecting boss is slidably engaged with the groove formed in the chain gear, the connecting boss moves while sliding along the groove, so that rotational torque is transmitted to the chain gear, and the chain gear is moved. The gear rotates around its axis of rotation. Thus, since the principle of the rotary slider mechanism is used for the rotational torque increasing mechanism, the stepping force applied to the pedal is applied to the chain gear from the crank arm via the connecting boss, and the chain gear is driven to rotate. The bicycle can be run.

The invention according to claim 2 relates to the bicycle travel drive apparatus according to claim 1, wherein the kerf of the chain gear is formed in the radial direction of the chain gear, and the kerf of the chain gear is In the operation region existing at the front position of the bicycle from the rotating shaft, the connecting boss is engaged with the front side of the kerf.
In the invention of claim 2, since the connecting boss is engaged with the front side in the operation region where the kerf exists on the front side of the rotation shaft of the chain gear, the crank arm is depressed by depressing the pedal. When it rotates, a rotational force that pushes the chain gear down from the connecting boss acts on the kerf, thereby enabling the bicycle to travel forward.
The invention according to claim 3 relates to the bicycle travel drive apparatus according to claim 1 or 2, wherein the rotational torque increasing mechanism is independently provided at symmetrical positions on both sides of the frame, and The crank arms on both sides are mounted so as to be rotatable with a phase difference of 180 degrees from each other.

In the invention of claim 3, since the rotational torque increasing mechanism is provided on both the left and right sides of the bicycle frame, it is possible to obtain a bicycle travel drive device that is balanced on the left and right. As a result, stable running performance can be obtained. Can be realized.
According to a fourth aspect of the present invention, there is provided the bicycle driving apparatus according to the first or second aspect, wherein the rotational torque increasing mechanism is provided only on one side of the bicycle frame, and the other side of the bicycle frame. The rotation axis of the crank arm by stepping on the pedal is rotatably provided on the side, and the rotation axis of the crank arm on the other side is the center of the stationary platen in the rotation torque increasing mechanism on either side And is provided between the rotation shaft of the other crank arm and the rotation shaft of the chain gear, from the crank arm on the other side to the chain gear. A driving force transmission means for transmitting the pedal depression force is provided.

In the invention of claim 4, the rotational torque increasing mechanism is arranged on either side of the bicycle frame, and a crank arm having a pedal is provided on the other side. The chain gear can be rotationally driven via the rotational torque increasing mechanism by stroking the pedal on either side provided with the rotational torque increasing mechanism. In other words, the chain gear has a structure in which the chain gear is provided on the side provided with the rotational torque increasing mechanism. Therefore, when the pedal on the other side is depressed, the rotational torque transmitted to the crank arm is driven. It is transmitted to the rotation shaft of the chain gear through the force transmission means. The bicycle traveling drive apparatus can also travel the bicycle.
A fifth aspect of the present invention relates to the bicycle travel drive apparatus according to any one of the first to fourth aspects, wherein the rotation shaft of the chain gear is provided on the fixed plate fixed to the frame. It is characterized by that.

  In the fifth aspect of the present invention, since the rotation shaft of the chain gear is provided on the fixed platen itself, in other words, the chain gear is provided on the frame via the fixed platen, the chain gear is rotatably supported on the fixed platen. Accordingly, the chain gear supported by the fixed platen rotates to allow the bicycle to travel.

According to the first aspect of the present invention, unlike the prior art, a bicycle travel drive device having a simple structure is realized by utilizing the principle of a rotary slide mechanism as a rotational torque increasing mechanism in a bicycle travel drive device. In addition, it is possible to easily increase the rotational torque without lengthening the crank arm, and because the structure has a small number of parts, the total weight of the bicycle can be reduced accordingly, thus improving the running performance of the bicycle. There is an effect that can be done.

According to the invention of claim 2, since the connecting boss is engaged with the front side of the kerf, the stepping force for stepping on the pedal and rotating the crank arm is effective for the kerf via the connecting boss. It is possible to exert an excellent effect in ensuring safe traveling during forward traveling of the bicycle, reducing labor, and improving stepping operability.

According to the invention of claim 3, since the rotational torque increasing mechanism is provided on both the left and right sides of the bicycle frame, the bicycle can be balanced in terms of weight distribution on the left and right as a whole, and safe driving can be favorably obtained. There is an effect that can be.

According to a fourth aspect of the present invention, the rotational torque increasing mechanism may be configured such that the rotational torque increasing mechanism is disposed only on one side of the bicycle frame and a crank arm having a pedal is provided on the other side. There is an effect that it is possible to realize a bicycle travel drive device that can increase the rotational torque of the chain gear by the mechanism.

According to the invention of claim 5, since the chain gear has a rotating shaft attached to the stationary platen, that is, the chain gear is indirectly provided on the frame via the stationary platen, the chain gear is arranged via the connecting boss. When driven to rotate, the chain gear rotates about a rotation shaft provided on the stationary platen and can travel a bicycle. As a result, substantially the same effect as that of any one of claims 1 to 4 can be exhibited.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on one embodiment shown in FIGS. FIG. 1 is a side view showing a schematic configuration of a bicycle driving apparatus according to an embodiment in a skeleton, FIG. 2 is an exploded perspective view showing components assembled in a bicycle frame, and FIG. FIG. 4 is an operation explanatory view for explaining the operation of the embodiment.

A schematic configuration of the bicycle travel drive apparatus according to the present embodiment will be described. In FIG. 1 and FIG. 2, a rotational torque increasing mechanism 1 of a bicycle travel drive device is provided between a crank arm 2 and a chain gear 3. The rotational torque increasing mechanism 1 includes a circular fixed plate 5 fixed to a frame 4, a rotary ring 7 having a hollow rice ball-like outer diameter provided on the outer periphery of the fixed plate 5 via a bearing 6, and a rotary ring 7. A rotation shaft P2 provided in the frame 4 through a position eccentric from the center point P1 of the stationary platen 5, a chain gear 3 rotatably mounted around the rotation shaft P2, and a chain gear 3, and a connecting boss 9 that extends through the kerf 8 in the vehicle width direction of the frame 4 and connects the crank arm 2 and the rotating ring 7.

The rotational torque increasing mechanism 1 will be described in more detail. The chain gear 3 is provided on a rotating shaft P2 attached to the frame 4 and freely rotates around the rotating shaft P2. For example, the chain gear 3 is wound around a chain gear (not shown) mounted on the rear wheel of a bicycle or an axle of the front wheel to transmit rotational torque. Further, a linear kerf 8 extending in the radial direction is formed on the side surface of the chain gear 3. The crank arm 2 is provided with a pedal 10 at its free end so as to be rotatable. The end opposite to the free end extends in a direction substantially perpendicular to the rotation surface of the crank arm 2 (the width direction of the frame 4). The connecting boss 9 passing through the kerf 8 is coupled.
A stationary platen 5 is fixed to the frame 4 between the frame 4 and the chain gear 3 via a stay 11. The stationary platen 5 has a disk shape, and is attached to the frame 4 with its side surface being in parallel with the rotation surface of the chain gear 3. The rotation axis P2 passes through the fixed plate 5 at a position offset from the center point P1 of the fixed plate 5. In other words, when the rotation axis P2 of the chain gear 3 is taken as a reference, the center point P1 of the stationary platen 5 is at a position offset from the rotation axis P2 of the chain gear 3. In any case, the chain gear 3 is rotatably supported on the rotation shaft P2 protruding outward from the fixed platen 5.

Further, on the outer periphery of the fixed platen 5, there is provided a ring-shaped rotating ring 7 having a concavo-convex protrusion 7 a through a bearing 6. The rotating ring 7 rotates along the outer periphery of the stationary platen 5 around the center point P1 of the stationary platen 5. At this time, the rotational axis P2 of the chain gear 3 is always in a region included in the rotating ring 7. Set to positional relationship.
The inner end of the connecting boss 9 that passes through the kerf 8 is coupled to the protrusion 7 a of the rotating ring 7. The connecting boss 9 is formed with a slider portion 9a functioning as a slider at a portion passing through the kerf 8 and slides while being guided by the kerf 8. In addition, the connecting boss 9 integrally couples the crank arm 2 and the rotating ring 7, but the crank arm 2 and the rotating ring 7 are allowed to rotate relative to the slider portion 9a. As a result, the crank arm 2 can rotate around the center point P 1 of the stationary platen 5 in conjunction with the rotating ring 7.
Thus, the principle of the so-called rotary slider mechanism is applied to the rotational torque increasing mechanism 1 in the bicycle travel drive device. That is, as shown in FIG. 1, the link L1 that rotates around the rotation axis P2 slides on the chain gear 3, and the slider L2 that slides on the link L1 moves on the slider portion 9a of the connecting boss 9 around the center point P1. And a link L3 pin-coupled to the slider L2 corresponds to the rotating ring 7 rotating on the stationary platen 5, respectively. The configuration in which the slider L2 slides along the link L1 corresponds to the configuration in which the slider portion 9a slides while being guided by the cut groove 8. That is, when the link L3 rotates around the center point P1, the rotational force is transmitted to the slider L2, and the link L1 rotates around the rotation axis P1, for example, clockwise. As a result, the rotary slider mechanism is applied to the rotary torque increasing mechanism 1.

In the present embodiment, a bicycle driving device having a rotational torque increasing mechanism is provided at symmetrical positions on both the left and right sides of the frame 4. The left and right crank arms 2 are rotatably mounted with a phase shift of 180 degrees from each other.
The operation of this embodiment will be described with reference to FIGS. When the bicycle is driven forward, a user seated on a saddle (not shown) places his right foot on the pedal 10 at position A in FIG. In this position A, the connecting boss 9 is located on the right side of the kerf 8, and the connecting boss 9, the kerf 8, the rotation center P 1, and the rotating shaft P 2 are almost straight on the extension line of the crank arm 2. They are lined up on the line. When the pedal 10 is depressed, the rotational torque of the crank arm 2 is transmitted to the rotating ring 7 via the connecting boss 9. The rotating ring 7 rotates the outer periphery of the stationary platen 5 around the center point P1. At the same time, the slider portion 9a of the connecting boss 9 is rotated to the B position as the clockwise rotational torque is transmitted to the chain gear 3 while sliding the groove 8 in the direction of the rotation axis P2. In this way, the crank arm 2 rotates clockwise around the center point P1 integrally with the rotating ring 7 by the principle of the rotary slider mechanism. At this time, rotational torque is transmitted from the slider portion 9a engaged with the kerf 8 to the chain gear 3 to the pedal 10, the chain gear 3 rotates clockwise, and the bicycle wheel is driven through a chain (not shown). The pedal 10 starts to travel forward and rotates to position C and position D. In this process, the pedal 10 in the other bicycle travel drive device provided on the opposite side (left side) of the frame 4 is depressed in the same manner, and the opposite chain gear 3 is rotated. Thus, the user can step forward on the bicycle by alternately depressing the left and right pedals 10 and rotating the crank arm 2.

  FIG. 5 is an explanatory diagram in which the rotational torque increasing mechanism 1 increases the rotational torque. In FIG. 5, 2 is a crank arm, 3 is a chain gear that rotates in an eccentric state, 3a is a chain gear that rotates without being eccentric, and 10 is a pedal. Here, F is a stepping force acting on the pedal 10, r1 is an effective rotational radius of the chain gear 3a that is not eccentric, f1 is a rotational torque of the chain gear 3a, r2 is an effective rotational radius of the chain gear 3 in an eccentric state, f2 Is the rotational torque acting on it.

  Therefore, when F = 50 kg, r1 = 89 mm, r2 = 65 mm, and L = 165 mm, f1 = F · 165/89 = 50 × 165 ÷ 89 = 92,7 kg. Further, f2 = F · 165/65 = 50 × 165 ÷ 65 = 126,9 kg. From these, f1 / f2 = 126, 9/92, 7 = 1, 369 are obtained.

As shown by the above formulas, according to the bicycle travel drive apparatus of the present embodiment, the rotational torque of the chain gear 3 can be increased by about 1 to 4 times, and the mechanical friction loss of the rotary bearing and the like can be taken into consideration. Thus, it is possible to increase the rotational torque by nearly 30% as compared with a normal bicycle.
As described above, according to the present embodiment, since the rotational torque increasing mechanism 1 using the principle of the rotary slider mechanism is used for the bicycle travel drive device, the crank arm 2 is not further lengthened. It is possible to increase the torque driving the gear 3, simplify the configuration by reducing the number of components, reduce the weight of the bicycle, ensure stable running performance, reduce the feeling of fatigue by reducing the stepping force, etc. There are advantages.
Although the present invention has been described in detail with reference to one embodiment, the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention, It is included in the range.

  In the above embodiment, the case where the rotational torque increasing mechanism 1 of the bicycle travel drive device is symmetrically arranged on both the left and right sides of the frame 4 has been described as an example, but instead, as shown in FIG. A first modified example having a configuration in which the rotational torque increasing mechanism 1 is provided only on the right side of the motor may be used. That is, in this modified example, on the left side of the frame 4, the rotation shaft 15 of the crank arm 14 by the depression of the pedal 13 is rotatably provided on the frame 4, and the rotation shaft 15 increases the rotation torque on the right side. The mechanism 1 is pivotally supported so as to substantially coincide with the center point P1 of the fixed platen 5 in the mechanism 1. A driving force transmission means 16 is provided between the rotation shaft 15 of the left crank arm 14 and the rotation shaft P2 of the chain gear. As the driving force transmission means 16, for example, a gear mechanism or a winding transmission mechanism is used. Further, the arm length of the crank arm 14 from the pedal 13 to the rotating shaft 15 on the left side is set equal to the arm length of the crank arm 2 from the pedal 10 on the right side to the center point P1. Further, the chain gear 3 is pivotally supported on the frame 4 so as to be integrally rotatable with the rotary shaft P2.

According to the first modified example, by rotating the crank arm 14 on the left side, the driving force that causes the bicycle to travel forward is transmitted to the rotating shaft P <b> 2 via the driving force transmitting means 16. As a result, by depressing the left and right pedals 10 and 13 alternately, the user can drive the bicycle and obtain substantially the same effect as in the above embodiment. Moreover, if this 1st modification is utilized as a bicycle for rehabilitation, the leg with a reduced motor function can be trained effectively.
Moreover, in the said Example and 1st modification, although it was set as the structure which penetrates the fixed plate | board 5 and the shaft 4 of the chain gear 3 is directly attached to the flame | frame 4, like the 2nd modification shown in FIG. It is good also as a structure which attaches the rotating shaft P3 to the stationary platen 5, and is provided in the flame | frame 4 indirectly. With the configuration of the second modified example, the rotational torque transmitted to the connecting boss 9 of the crank arm 2 is transmitted from the kerf 8 to the chain gear 3, and as a result, the chain gear 3 is rotated on the rotation axis P 3 on the stationary platen 5. The bicycle can be run by rotating around the center.

Further, as in the third modification shown in FIG. 8, a rotation shaft P3 is provided so as to penetrate the fixed plate 5 fixed to the left and right of the frame 4, and the connection link 20 is coupled to the rotation shaft P3 so as to rotate integrally. To do. The rotating shaft P3 is integrally coupled with the chain gear 3. Then, a cut groove 21 is formed in the connection link 20, and the left crank arm 2 and the rotating ring 7 are connected through a connection boss 22 penetrating the cut groove 21. With this configuration, when the crank arm 2 rotates, the connecting boss 22 rotates integrally with the rotating ring 7 together with the rotating ring 7 while being guided by the kerf 21. That is, the pedal 10 rotates around the rotation axis P1. As a result, the connecting link 20 rotates, but this rotational torque is transmitted as rotational torque for rotationally driving the right chain gear 3 via the rotational shaft P3, so that the bicycle is driven by the rotational torque of the left and right crank arms 2. The chain gear 3 can be driven to travel.

It is the side view which showed schematic structure in one Example of this invention with the skeleton. It is an external appearance assembly disassembled perspective view which decomposed | disassembled and showed the component integrated in a bicycle frame concerning the said Example. It is the principal part enlarged plan view which expanded and showed the principal part of the said Example. It is operation | movement explanatory drawing explaining operation | movement of the said Example. It is explanatory drawing explaining rotation torque increase of a chain gearwheel. It is a principal part enlarged plan view similar to FIG. 3 in the 1st modification of the said Example. It is a principal part enlarged plan view similar to FIG. 3 in the 2nd modification of the said Example. It is a principal part enlarged plan view similar to FIG. 3 in the 3rd modification of a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotation torque increase mechanism 2 Crank arm 3 Chain gear 4 Frame 5 Fixed board 6 Bearing 7 Rotating ring 8 Groove 9 Connection boss 9a Slider part 10 Pedal 11 Stay 13 Pedal 14 Crank arm 15 Rotating shaft 16 Driving force transmission means 20 Connection link 21 Cut groove 22 Connecting boss L1 Link L2 Slider L3 Link P1 Center point P2 Rotating shaft P3 Rotating shaft

Claims (5)

  In a bicycle drive apparatus in which a rotational torque increasing mechanism is provided between a chain gear rotatably provided on a bicycle frame and a crank arm that rotates by depressing a pedal, the rotational torque increasing mechanism includes the frame and the chain. A circular fixed plate having a center point at a position offset from the rotation axis of the chain gear, the surface of which is attached to the frame between the gear and the rotation surface of the chain gear; A rotating ring which is provided on the outer periphery of the board via a bearing and which rotates around the center point of the stationary plate in a form including the rotation shaft of the chain gear, a kerf formed in the chain gear, and the kerf And a connecting boss that connects the rotary ring and the crank arm through the kerf. Line drive. The kerf of the chain gear is formed in the radial direction of the chain gear, and in the operation region where the kerf exists at the front position of the bicycle from the rotation axis of the chain gear, the connecting boss is moved forward of the kerf. The bicycle travel drive device according to claim 1, wherein the bicycle travel drive device is engaged with the side.   The rotational torque increasing mechanism is provided independently at symmetrical positions on both sides of the frame, and the crank arms on both sides are rotatably attached with a phase difference of 180 degrees from each other. Item 3. A bicycle travel drive apparatus according to item 1 or 2. The rotational torque increasing mechanism is provided only on one side of the bicycle frame, and the other side of the bicycle frame is rotatably provided with a rotating shaft of a crank arm by depressing a pedal. The rotational axis of the crank arm on the other side is pivotally supported so as to substantially coincide with the center point of the stationary platen in the rotational torque increasing mechanism on either side, and the rotational axis of the crank arm on the other side 3. A driving force transmitting means provided between the rotation shaft of the chain gear and transmitting a pedal depression force from the crank arm on the other side to the chain gear. The bicycle travel drive apparatus described.   5. The bicycle travel drive device according to claim 1, wherein a rotation shaft of the chain gear is provided on the fixed plate fixed to the frame. 6.

Images