JP4080525B1 - Bicycle traveling drive device - Google Patents

Abstract

[PROBLEMS] To transmit a driving force of 2 to 10 times to a rear wheel by simply depressing left and right pedals than a conventional bicycle depressing force.
A first rotating member that is pivotally supported by a frame of a bicycle and rotated by a pedal arm, and a second rotating member that is pivotally supported by the frame so as to rotate via a winding member. A first link 11 whose upper end is pivotally supported by a crank arm that rotates integrally with the second rotating member 8, and a second end whose pivotal end is pivotally supported by the lower end of the first link 11 and whose front end is pivotally supported by the frame 2. A link 12 and a third link 13 whose front end is pivotally supported by the lower end of the first link 11 and coaxially with the second link 12 and whose rear end is pivotally supported by a one-way clutch 14 provided on the rear axle 4a of the rear wheel 4. A pair of toggle mechanisms formed by the first link 11, the second link 12, and the third link 13 are provided on both sides of the frame 2, and the coaxial points P2 on both sides are alternately moved up and down, The driving force of the pedal arm is transmitted to the rear wheel 4 It is.
[Selection] Figure 1

Description

  The present invention relates to a bicycle travel drive device.

  Conventionally, as shown in FIG. 11, a normal bicycle drive device drives a large sprocket 102 that is directly connected to a crank 101 by depressing a pedal 100. Power is transmitted to the small sprocket 104 via the chain 105 wound between the large sprocket 102 and the small sprocket 104 provided on the rear wheel 103, and the bicycle is driven to run by rotating the rear wheel 103. However, since there is no mechanism for mechanically increasing the force to depress the pedal 100 during the period from the large sprocket 102 to the small sprocket 104, the force for driving the rear wheel 103 is small. On the other hand, bicycles with electric motors are equipped with a battery, so the weight of the vehicle is large and the price is high. If the electrical system fails, there is a risk of malfunction, and the battery power is lost. In some cases, the weight of the vehicle is large, and a great deal of labor is required to run the bicycle.

By the way, there exists a thing of patent document 1 as a bicycle which improves the climbing performance of a bicycle. The technology described in Patent Document 1 replaces a large sprocket, a small sprocket, and a chain with a rack and pinion mechanism so that the bicycle travels forward. In other words, in the technique described in Patent Document 1, the front end of the rack is rotatably coupled to the free ends of a pair of opposed crank arms that are coupled to the pedal arm with a phase difference, and the rear end of the rack is It is configured to mesh with a pinion provided on the one-way clutch of the rear wheel. By depressing the pedal and rotating the crank arm, each rack swings around the pedal shaft. The rear wheel is driven by rotating the pinion only in the direction in which the bicycle moves forward by the moving component in the front-rear direction of the rack caused by this swinging motion, so that the bicycle can travel forward.
JP 2002-240770 A

  However, in the technique described in Patent Document 1 described above, although the pedal operation that the pedal arm is heavy near the top dead center is lightened, the driving force of the rear wheels is increased even if the stepping force is small. It does not have a configuration that improves the climbing performance.

  The present invention has been made in view of the above technical problem, and by simply depressing the left and right pedals, a driving force of about 2 to 10 times the driving force of a conventional bicycle is efficiently transmitted to the rear wheels, An object of the present invention is to provide a bicycle driving device capable of improving the climbing performance.

  (1) In order to achieve the above object, the present invention adopts the following configuration. That is, the present invention is a bicycle travel drive device, which is pivotally supported by a bicycle frame and rotated by a pedal arm, and is rotated via a winding member between the first rotation member. A second rotating member pivotally supported by the frame, a first link having an upper end pivotally supported by a crank arm that rotates integrally with the second rotating member, and a rear end pivoting on the lower end of the first link. A second link that is supported and has a front end pivotally supported by the frame, a front end pivotally supported by the lower end of the first link and the second link, and a rear end provided on the axle of the rear wheel. A third link pivotally supported by the clutch, and a pair of toggle mechanisms formed by the first link, the second link, and the third link are provided on both sides of the frame. Coaxial point of link, second link and third link By vertically moving alternately, characterized in that the driving force of the pedal arm is transmitted to the rear wheels.

  According to such a configuration, the pedal depression force is transmitted to the rear wheel via the one-way clutch by the first link, the second link, and the third link forming a pair of toggle mechanisms provided on both sides of the frame. . That is, since the coaxial points of the first link, the second link, and the third link are alternately moved up and down, the driving force of the pedal arm is transmitted to the rear wheel, and the bicycle can be moved forward. .

  (2) In the present invention, the toggle mechanism is configured such that the second link and the third link have the coaxial point as a bending point via the first link that responds to the rotation of the pedal arm. The bent state is repeatedly bent and extended between the bent state bent in the shape of a letter and the extended state in which the second link and the third link extend substantially in a straight line, and is displaced from the bent state to the extended state. Sometimes, the second link and the third link are formed so that a driving force is transmitted to the rear wheel via the one-way clutch. It is.

  According to such a configuration, the second link and the third link move the rear wheel according to the displacement from the bent shape with the center point at the coaxial point to the state in which both links extend substantially in a straight line. Since the driving force increases, the bicycle can be efficiently traveled with a small force, and it is possible to easily travel uphill.

  (3) In the present invention, a bent portion is formed at the rear end of the third link, and the rear end of the third link is pivotally supported on the side facing the road surface of the one-way clutch. The bicycle travel drive apparatus according to (1) or (2) above.

  According to such a configuration, since the bent portion is formed on the third link, the third link can be prevented from interfering with the one-way clutch, and smooth power transmission can be performed.

  (4) The present invention is also characterized in that the first rotating member and the second rotating member are formed of a pulley, and the winding member is formed of a timing belt. The bicycle travel drive device according to any one of the above.

  According to such a configuration, since the timing belt is wound around the groove of the pulley, it is possible to reliably transmit the driving force and to obtain a travel drive device that is excellent in quietness.

  (5) The present invention is also characterized in that the first rotating member and the second rotating member are formed of sprockets, and the winding member is formed of a chain. A bicycle driving apparatus according to any one of the above.

  According to such a configuration, since the driving force is transmitted by the combination of the sprocket and the chain, the driving force transmission loss can be reduced.

  According to the present invention, it is possible to efficiently run a bicycle with a small force as compared to a conventional bicycle, and it is possible to exhibit good running performance by increasing the rotational driving force on an uphill, etc. By reducing the weight of the bicycle, it is possible to obtain a traveling drive device for the bicycle at a low cost.

  Hereinafter, an embodiment of a bicycle travel drive apparatus according to the present invention will be described in detail with reference to the drawings. 1 is a side view of a bicycle according to the present embodiment, FIG. 2 is an enlarged side view of a main part of FIG. 1, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. FIG. 5 is a sectional view taken along line B-C in FIG. 2, and FIG. 6 is a sectional view taken along line D-D in FIG.

  As shown in FIGS. 1 and 2, the schematic configuration of the bicycle 1 includes a front wheel 3 and a rear wheel 4 that are pivotally supported on the frame 2 via a front axle 3a and a rear axle 4a, a pair of left and right pedals 5, and a pair of left and right pedals. As a second rotating member disposed between the front wheel 3 and the rear wheel 4 behind the first pulley 7 and the first pulley 7 as the first rotating member driven by the pedal arm 6. The second pulley 8, the timing belt 9 wound around the first pulley 7 and the second pulley 8, and a crank-shaped symmetrical arrangement so as to rotate integrally with the second pulley 8. A pair of crank arms 10, a pair of left and right first links 11 pivotally supported by the left and right crank arms 10, and a pair of second symmetrically disposed at the lower ends of the first links 11 in a coaxial relationship. Link 12 and third link 13, and Composed of the one-way clutch 14 for supporting the rear end of the third link 13. Hereinafter, the above components will be described more specifically.

  On the left and right sides of the frame 2, a pair of pedal arms 6 that pivotally support the pedal 5 are symmetrical in a crank shape on the left and right sides of the frame 2, as shown in FIG. It arrange | positions and the 1st pulley 7 is provided in the pedal arm axis | shaft 6a so that it may rotate integrally via the key 6b. As the pedal arm shaft 6 a is pivotally supported by the frame 2, the first pulley 7 is pivotally supported by the frame 2.

  A second pulley 8 is pivotally supported immediately behind the first pulley 7 as shown in FIG. A pair of crank arms 10 are symmetrically arranged in a crank shape on both the left and right sides of the frame 2. A crank arm shaft 10a that couples the pair of crank arms 10 is pivotally supported by the frame 2, and the second pulley 8 is provided to rotate integrally with the crank arm shaft 10a via a key 10b. Thus, the crank arm 10 is pivotally supported by the frame 2 so that the second pulley 8 is pivotally supported by the frame 2.

  A timing belt 9 as a winding member is wound between the first pulley 7 and the second pulley 8. Therefore, by depressing the pedal 5 in the clockwise direction in FIG. 1, the crank arm 10 can be rotated clockwise about the crank arm shaft 10a via the first pulley 7, the timing belt 9, and the second pulley 8. It rotates together with the pulley 8.

  The pair of first links 11 are pivotally supported by the crank arms 10 via pins P1 at the upper ends, while the rear ends of the second links 12 and the third links 13 at the lower ends of the first links 11, respectively. The front end of the shaft is coaxially supported by a pin P2. That is, the pin P <b> 2 functions as a coaxial point for the first link 11, the second link 12, and the third link 13. The front end of the second link 12 is pivotally supported by a bracket 15 provided on the frame 2 via a pin P3, and the rear end of the third link 13 forms a bent portion 13a. A one-way clutch 14 provided on the rear axle 4a is pivotally supported via a pin P4. By forming the bent portion 13 a in the third link 13, the third link 13 is prevented from being buffered by the one-way clutch 14. Thus, as shown well in FIG. 2, the left and right sides of the frame 2 are formed by a first link 11, a second link 12, and a third link 13 that are pivotally supported on the crank arm 10 by the pin P 1. Toggle mechanisms are arranged symmetrically on the left and right sides of the frame 2, respectively. 2 shows a toggle mechanism in which a hatched member is disposed on the other side of the frame 2 (the back side of the drawing), and a toggle mechanism in which a non-hatched member link exists on the front side of the frame 2 is shown. Shall.

  The one-way clutch 14 is a mechanism known per se, and torque is applied so that the rear wheel 4 rotates in the clockwise direction only when a driving force is applied in the direction in which the bicycle 1 travels forward from the third link 13. In other cases, the transmission of the driving force from the third link 13 to the rear wheel 4 is blocked.

  In addition, it is preferable that each member which comprises the bicycle in this one embodiment is set to the following dimensions, for example. That is, the front wheel 3 and the rear wheel 4 have a radial dimension of 330 mm, the distance between the axles 3 a and 4 a between the front wheel 3 and the rear wheel 4 is 1100 mm, the arm length of the pedal arm 6 is 130 mm, and the road surface R of the pedal arm shaft 6 a Of the crank arm shaft 10a is 315mm, the horizontal distance between the pedal arm shaft 6a and the crank arm shaft 10a is 100mm, the vertical height distance is 30mm, the first pulley 6 The outer diameter of the second pulley 8 is 60φ, the length (rotation radius) of the crank arm 10 is 66 mm, the length of the first link 11 is 132 mm (distance between the pin P1 and the pin P2), the crank The horizontal distance between the arm shaft 10a and the rear axle 4a is set to 390 mm. Of course, it is needless to say that an appropriate dimension other than the above may be set.

  Next, a toggle mechanism that is a characteristic component of the present invention will be described. A toggle mechanism provided on either one of the left and right sides of the frame 2 is formed by a first link 11, a second link 12, and a third link 13 that are driven by a crank arm 10 via a pin P 1. In this toggle mechanism, as shown in the schematic diagram of FIG. 7, the force acting on the pin 2 via the first link 11 is W, and the third link acting in the direction of the line L connecting the pin P3 and the pin P4. A force acting from 13 (a force for driving the rear wheel 4) is defined as P. When the angle formed by the third link 13 and the line L is θ, the relational expression P = W / tan θ is established. In this relational expression, as the angle θ decreases, the denominator tanθ of the relational expression decreases accordingly. Therefore, when W is constant, the force P for driving the rear wheel 4 increases. In other words, when the angle formed by the second link 12 and the third link 13 is 180 degrees from the obtuse angle, that is, as close as possible to the horizontal, the rear wheel 4 is rotated with a large driving force.

  The traveling drive device according to the present embodiment is configured using such a toggle mechanism. The operation of the travel drive device will be described with reference to FIGS. 8 to 10. When the pedal is stepped on the tilted position, the pin P1 of the crank arm 10 is at the bottom dead center, and the second link 12 and the third link 13 are bent downward at an obtuse angle in a dogleg shape. That is, the pin P2 is in the lowest position. At this time, the pin P4 at the rear end of the third link 13 is displaced to the foremost position with respect to the one-way clutch 14, as shown in FIG. Further, a large driving force is generated vertically upward with reference to the pin 2 that is the coaxial axis of the second link 12 and the third link 13, and this driving force is transmitted to the crank arm 10 and the second link via the first link 11. Since it is transmitted to the pulley 8, the rotational force of the crank arm 10 and the second pulley 8 can be increased to about 10 to 12 times compared to the case where the vertical driving force does not act.

  Next, when the pedal arm 6 is stepped on to a forward inclined position of 60 ° with respect to the vertical line, the links 11 to 13 constituting the toggle mechanism are indicated by two-dot chain lines as shown in FIG. The pin P4 moves rearward from the position to the state indicated by the solid line. Also at this time, since the driving force in the vertical direction described above acts, the rotational force of the crank arm 10 and the second pulley 8 is increased by this driving force.

  Furthermore, as shown in FIG. 10, when the pedal arm 6 is stepped on to a position of 90 ° with respect to the vertical line, the links 11 to 13 constituting the toggle mechanism are in a state of the lowest position shown by the two-dot chain line. Thus, the pin P4 moves further rearward. From this state, the crank arm 10 rotates toward the top dead center along the locus circle C1, and the second link 12 and the third link 13 are extended and displaced to approximately 180 °, that is, in a straight line. At this time, the links 11 to 13 forming the other toggle mechanism on the opposite side operate in the opposite direction, that is, the pin P2 of the other toggle mechanism is displaced downward. Yes. At this time, although the vertical driving force is reduced, the second link 12 and the third link 13 are extended and displaced in a substantially straight state, and the horizontal driving force is substituted for the vertical driving force. Therefore, the driving force of the rear wheel 4 is not weakened.

  Thus, according to the present embodiment, when the pedal arm 6 rotates in the clockwise direction indicated by the arrow, the second pulley 8 rotates via the timing belt 9 by the rotation of the first pulley 7, and the crank arm 10 rotate synchronously. As a result, the pin P1 rotates clockwise on the locus circle C1, and in response thereto, the pin P2, which is the coaxial point of the second link 12 and the third link 13, reciprocates up and down along the locus curve C2. To do. Thus, the first link 11 causes the second link 12 and the third link 13 to reciprocate between a state where they are bent at an obtuse angle with the pin P2 and a state where they are extended from this state. In addition, the other toggle mechanism on the opposite side also operates in a phase relationship opposite to the above.

  As a result, when the pin P2 as the coaxial point is displaced upward, the driving force is transmitted to the rear wheel 4 by the one-way clutch 14 pivotally supported by the pin P4. Such driving force is alternately transmitted through the toggle mechanisms provided on the left and right sides of the frame 2, and as the second link 12 and the third link 13 expand and displace toward a substantially straight line, the driving force is increased. The driving force to the one-way clutch 14 can transmit a force that is about 2 to 10 times that of the conventional bicycle to the rear wheels.

  Therefore, compared with the conventional bicycle, the bicycle can be efficiently traveled with a small force, and traveling such as an uphill can be performed smoothly. In addition, it is possible to provide a cheaper bicycle than an electric bicycle, and further, since it is not necessary to provide an electric motor, a lightweight bicycle can be obtained.

  In addition, since the bent portion 13a is formed at the rear end of the third link 13 and the pin P4 is coupled to the one-way clutch 14, the third link 13 does not interfere with the one-way clutch 14, so that a smooth operation is obtained. be able to.

  Moreover, in the said one Embodiment, since the timing belt 9 is used as a winding member, since it can utilize reliably for the drive of the rear wheel 4 without losing the depressing force of the pedal 5, energy efficiency may fall. In addition, quietness can be ensured.

  Although the present invention has been described in detail with reference to one embodiment, the specific configuration is not limited to this embodiment, and design changes and the like within the scope of the present invention are also included in the scope of the present invention. Is.

  For example, the driving force is transmitted by the first pulley 7, the second pulley 8, and the timing belt 9 interposed between the pulleys. Instead, the first pulley and the second pulley are connected to the sprocket. It is good also as a modification which formed in (4) and wound the chain between these sprockets. By adopting the configuration of such a modified example, as in the case of the above-described embodiment, it is possible to reliably transmit the force to drive the rear wheel 4 without losing the stepping force of the pedal 5.

  Moreover, although the 1st rotation member 7 and the 2nd rotation member 8 were provided in the above, it is set as the aspect which interposes a 3rd rotation member between the 1st rotation member 7 and the 2nd rotation member 8. FIG. It is also possible.

  In the above embodiment, although not shown, the traveling drive device may be covered with an appropriate cover member so that it is not exposed from the outside. According to this, it is possible to prevent the foot or clothes from touching the travel drive device, and further safe travel can be realized.

  In the above description, the bent portion 13a is formed at the rear end of the third link 13. However, when the third link 13 swings with respect to the one-way clutch 14, it is pin-coupled so as not to interfere with the one-way clutch 14. In such a case, the third link 13 may be formed in a linear shape.

  The present invention is applicable to a bicycle travel drive device.

1 is a side view of a bicycle driving apparatus according to an embodiment of the present invention. It is a principal part enlarged side view of FIG. FIG. 3 is an enlarged cross-sectional view taken along line AA in FIG. 2. FIG. 3 is an enlarged cross-sectional view taken along the line BB in FIG. 2. FIG. 3 is an enlarged cross-sectional view taken along line CC in FIG. 2. FIG. 3 is an enlarged cross-sectional view taken along the line DD in FIG. 2. It is explanatory drawing of the toggle mechanism applied to the said one Embodiment. It is a side view explaining the effect | action of the said one Embodiment. Similarly, it is a side view explaining an operation. Similarly, it is a side view explaining an operation. It is a side view in a conventional device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bicycle 2 Frame 3 Front wheel 4 Rear wheel 5 Pedal 6 Pedal arm 7 1st pulley 8 2nd pulley 9 Timing belt 10 Crank arm 11 1st link 12 2nd link 13 3rd link 13a Bending part 14 One-way clutch C1 Trajectory circle C2 Trajectory curve L Line connecting pin P3 and pin P4 P1 pin P2 pin (coaxial point)
P3, P4 pin R Road surface

Claims (4)

A first rotating member pivotally supported on the bicycle frame and rotated by a pedal arm;
A second rotating member pivotally supported on the frame so as to rotate via a winding member between the first rotating member;
A first link whose upper end is pivotally supported by a crank arm that rotates integrally with the second rotating member;
A second link whose rear end is pivotally supported by the lower end of the first link and whose front end is pivotally supported by the frame;
A front end is pivotally supported coaxially with the second link at a lower end of the first link, and a rear end is pivotally supported by a one-way clutch provided on an axle of a rear wheel, and
A pair of toggle mechanisms formed by the first link, the second link, and the third link are provided on both sides of the frame, and the coaxial points of the first link, the second link, and the third link on the both sides are alternately arranged. By moving up and down, the driving force of the pedal arm is transmitted to the rear wheel,
A bent portion is formed at the rear end of the third link, while the rear end of the third link is pivotally supported on the side facing the road surface side of the one-way clutch ,
Bicycle travel drive device. The toggle mechanism is
A bending state in which the second link and the third link are bent in a dogleg shape with the coaxial point as a bending point through the first link that responds to the rotation of the pedal arm; Repeating the bending and stretching movement between the link and the third link extending in a substantially straight line,
The second link and the third link are formed so that a driving force is transmitted to the rear wheel via the one-way clutch when displaced from the bent state to the extended state. To
The bicycle travel drive apparatus according to claim 1. The first rotating member and the second rotating member are formed of pulleys;
The winding member is formed of a timing belt,
The bicycle travel drive apparatus according to claim 1 or 2. The first rotating member and the second rotating member are formed of sprockets;
The winding member is formed of a chain,
The bicycle travel drive apparatus according to claim 1 or 2.

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