JP3148769U - Speed increase drive mechanism, bicycle with speed increase drive mechanism, wheelchair with speed increase drive mechanism - Google Patents

Abstract

A speed increasing mechanism for a wheel having high stability and safety is provided. An inner case having a hole for penetrating an axle, a chain guide attached to an end of the inner surface of the inner case, and a pedal. A crank with a shaft, an outer case through which a rotating shaft of the crank with a pedal passes, an axle gear mounted in a tip of an axle passing through a hole in the inner case and formed in a case formed by the inner case and the outer case, A chain that is hung on an axle gear and a chain guide, and a large gear with an internal tooth that is integrated with a crank with a pedal and meshes with the chain inside the case. A speed increasing drive mechanism in which the rotation centers of the rotating shafts coincide. [Selection] Figure 6

Description

  The present invention is a bicycle wheel, in particular, a front wheel drive type bicycle front wheel, a wheelchair wheel, etc., a speed increasing drive mechanism for speed increasing when the wheel shaft is driven by a crank or a pedal, etc. The present invention relates to a simplified frame structure of a bicycle using a mechanism.

Various speed-up drive mechanisms used for bicycles and the like have been proposed. For example, Patent Document 1 describes a front wheel drive type bicycle equipped with a speed increasing mechanism. This bicycle front wheel speed increasing mechanism directly drives and accelerates a gear provided on the axle of the front wheel with an internal large gear connected to the crank and pedal, but the transmission point of the driving force is the gear. There is only a portion where the gears mesh with each other, and there is a bias in the balance of the load. Further, in this example, the front wheel shaft and the large gear shaft do not coincide with each other and do not form concentric circles. As another example, Patent Document 2 describes an example in which a chain is used for front wheel drive, but the structure is complicated.
JP-A-6-099871 JP 2006-21554 A

  In the bicycle front wheel speed increasing mechanism described in Patent Document 1, the positions of the pedal rotation shaft and the wheel rotation shaft are shifted. Specifically, the rotating shaft of the large gear is the rotating shaft of the pedal, and is not concentrically arranged with the front axle. However, since the rotation axis of the wheel and the rotation axis of the pedal are usually the same, this is a structure unfamiliar to the operator, and the direction of the downward force with which the leg presses the pedal is the contact part between the ground and the tire. It doesn't match and some pilots feel more unstable. In addition, it becomes a constraint condition when applied to wheels used other than bicycles. Further, the transmission point of the driving force from the pedal is limited to the portion where the two gears mesh with each other, and there may be a problem in load balance and safety.

  Even if the speed increasing drive mechanism described in Patent Document 1 is attached to the bicycle front wheel, the structure is not simplified, and the folding of the bicycle becomes complicated.

  The speed increasing drive mechanism according to the present invention includes an inner case having a hole for penetrating an axle, a chain guide attached to an end of the inner surface of the inner case, a crank with a pedal, and a rotating shaft of the crank with the pedal. An outer case, an axle gear that is attached to the tip of the axle that passes through the hole of the inner case and is formed by the inner case and the outer case, a chain that is hung between the axle gear and the chain guide, and a crank with a pedal And a large gear with an internal tooth that meshes with the chain inside the case, and the rotation center of the axle, the rotation center of the large tooth, and the rotation center of the rotation shaft of the crank with a pedal coincide with each other. Yes.

  The bicycle of the present invention includes the speed increasing mechanism described above.

  The wheelchair of the present invention includes the speed increasing mechanism described above.

  The bicycle according to the present invention is a seat tube in which the speed increasing drive mechanism is mounted on the front wheel, the handle tube and the head tube for supporting the fork, and one end connected to the saddle and the other end connected to the head tube near the fork exit. And a seat stay having one end connected to the saddle and the other end connected to the rear wheel shaft portion.

  The speed increasing drive mechanism of the present invention can make the rotation center of the axle gear coincide with the rotation center of the large driving gear, and therefore, the shaft of the entire wheel can coincide with the rotation shaft of the pedal and the crank. . In the case of the arrangement in which the rotation shaft of the axle gear and the rotation shaft of the speed increasing drive mechanism are made to coincide with each other, it is stable mechanically and can effectively absorb the force of the driver pushing the pedal downward. This improves the feeling of instability given to the pilot. In addition, compared to the case where the gears are directly meshed with each other by using a chain, a region where the driving force is transmitted on the gears is widened, and the load on each part is distributed and safety is increased. Furthermore, as shown in FIGS. 5 and 6, if a chain guide is provided in the vertical direction of the case, the large gear can be engaged with the chain from the vertical direction, and it is strong and stable even at high speed rotation in line with the direction of gravity. The chain can be driven.

  The bicycle of the present invention has the above speed increasing mechanism attached to the front wheel, and the seat tube is connected to the saddle and the head tube near the fork outlet, thereby eliminating the top tube, down tube and chain stay from the frame structure. Can be Therefore, it is possible to reduce the number of parts and the number of man-hours during manufacturing. Further, when a folding mechanism is added, a folding mechanism with a simple structure is sufficient.

  The configuration and operation of the speed increasing drive mechanism 2 according to an embodiment of the present invention will be described with reference to the drawings, taking as an example the case of applying to the front wheel 1 of a bicycle. Finally, the speed increasing drive mechanisms 2 are attached to both side surfaces of the front wheel 1 as shown in FIG. Part of the weight of the driver and the weight of the bicycle is transmitted from the fork 12b to the axle 5a and supported by the grounding portion of the front wheel 1. The fork 12b is connected to the head tube 12 so that the direction can be controlled by a handle (not shown), and a handle is attached to the top of the fork 12b. The bicycle operator rotates the crank 3 with two pedals, and the rotation is caused by the large gear 10 and the chain 11 provided inside the case 16 formed by the inner case 8 and the outer case 9 as described later. To the axle gear 5 (see FIG. 5) to rotate the axle 5a. The center of rotation of the large gear 10, the center of rotation of the rotating shaft 4 of the crank with pedal and the center of rotation of the axle 5 a all coincide with one straight line A. The inner case 8 is fixed to the fork 12b and the fork mounting plate 12d by screwing through a screw hole 12f (see FIG. 2). A rotating shaft 4 of a crank with a pedal passes through a central portion of the outer case 9.

  As shown in FIG. 2A, an axle gear 5 is attached to the tip of the axle 5a. As shown in FIGS. 2 (b) and 2 (c), the axle gear 5 is provided at the tip of the axle 5a passing through a hole 12e provided with a normal axle bearing at the bottom of the fork 12b. (See below). Since both ends of the spokes arranged radially around the axle are fixed to the axle 5a and the front wheel 1, the front wheel 1 rotates when the axle 5a is rotated. 2 (a), 2 (b), and 2 (c) only show the axle 5a and the axle gear 5 on one side of the front wheel 1, the other side has the same structure.

  A perspective view of the inner case 8 and the outer case 9 is shown in FIG. The inner case 8 is a plastic disk-like member, for example, and includes a hole 6 for penetrating the axle and a chain guide 7 attached to the end of the inner surface 6a. The screw hole 12g of the inner case is provided at a position that coincides with the screw hole 12f on the fork side. As a standard of the present invention, the chain guide 7 is provided symmetrically with respect to the hole 6 for penetrating the axle, and in FIG. Depending on the size of the wheel 1, the size of the axle gear 5, and the like, an asymmetrical arrangement can be adopted in order to drive the axle 5 a effectively. The axle 5a (see FIG. 2) passes through a hole 6 in which a gap is closed with a bearing or the like so as not to hinder rotation.

  The outer case 9 is a plastic dome-shaped member, for example, and the rotation shaft 4 of the pedal-equipped crank passes through the center portion thereof. The rotation shaft 4 of the crank with pedal is rotatably held by, for example, a ball bearing provided at the center of the outer case 9.

  The inner case 8 and the outer case 9 are coupled by, for example, screwing the outer peripheral portions thereof, and a case 16 that accommodates the axle gear 5, the chain guide 7, the large gear 10, and the chain 11 (see FIG. 5) is contained therein. Form. The large gear 10 (see FIG. 5) integrated with the pedal-equipped crank 3 is accommodated in the case 16 to prevent the pedal-equipped crank 3 from deviating outward.

  A front view and a side view of the integrally constructed large gear 10 and pedaled crank 3 are shown in FIGS. 4 (a) and 4 (b), respectively. The large gear 10 is provided with inner teeth that mesh with the chain 11 (see FIG. 5) on the inner surface of a ring-shaped member. The large gear 10 is integrated with the rotating shaft 4 of the crank with a pedal through a spoke 10a inside the case 16. Attached.

  How to hang the chain 11 will be described with reference to FIG. A chain 11 is mounted so as to mesh with the left and right sides of the axle gear 5 attached to the tip of the axle 5a that has passed through the axle penetration hole 6 (see FIG. 3) of the inner case 8, and the chain guide 7 Call it.

  A side view of the chain guide 7 is shown in FIG. 6B, and a front view is shown in FIG. 6C. The chain guide 7 is a substantially elliptical columnar member, and one end thereof is fixed to the inner case 8. Since the chain 11 meshes with the internal teeth of the large gear 10 having internal teeth at the outer portion of the chain guide 7, the chain guide 7 is connected to the chain 11 and the large gear 10 as shown in FIGS. 6 (a) and 6 (b). Therefore, at least a portion of the peripheral portion where the chain 11 is hooked is deeply concave so that the large gear 10 can be sufficiently held, and the concave surface is finished smoothly. The shape of the portion in contact with the chain is an arc shape having a slightly smaller bending radius than the inner diameter of the large gear 10 so that the chain 11 can be securely meshed with the large gear 10 and the chain 11 can move smoothly. It is desirable to do. Further, the chain guide 7 also functions to stabilize the large gear 10 so that it does not come off even during intense rotation, so that the chain guide 7 (two on the left and right sides) cannot be chained as shown in FIGS. ) Is also finished in the same manner as the chain guide 7 (two pieces on the top and bottom) on which the chain 11 is hung.

  An arrangement of the large gear 10 having internal teeth for driving the chain 11 is shown in FIG. In FIG. 6A, the outer case 9 is omitted. The center of the large circular gear 10 coincides with the center of the axle gear 5, and the two gears have a concentric relationship. The internal teeth of the large gear 10 mesh with the chain 11 that is hooked along the outside of the chain guide 7 provided at both ends of the inner case 8. When the crank 3 with the pedal rotates, the large gear 10 rotates, the meshed chain 11 rotates in the same direction, and the axle gear 5 also rotates in the same direction.

  The manner of hanging the chain 11 is not limited to the mode shown in FIGS. 5 and 6A. If a part of the chain 11 can be directly applied to the axle gear 5 and another part of the chain 11 can be applied to the internal teeth of the large gear 10, the position and the number of arrangement of the chain guide 7 are arbitrary. . Further, the shape of the chain guide 7 is not limited to that described in this embodiment. Any shape may be used as long as the chain 11 can be slid at the portion in contact with the chain 11.

  Further, the speed increasing drive mechanism 2 uses a donut-shaped gear provided with both internal teeth and external teeth instead of the chain 11, and drives the axle gear 5 with the internal teeth of the donut-shaped gear so that the donut-shaped gear is driven. It is also possible to transmit the rotational force of the pedal to the axle gear 5 so as to mesh with the large gear 10 with the external teeth of this gear. In this case also, the rotation center of the axle, the rotation center of the large gear, and the rotation center of the rotation shaft of the pedaled crank coincide. A guide similar to the chain guide 7 is used to stabilize the donut-shaped gear, but basically the same as the drive by the chain 11.

  The number of teeth of the large gear 10 and the axle gear 5 determines the number of revolutions of the front wheel 1 when the pedaled crank 3 rotates once. In order to increase the speed, the number of teeth of the large gear 10 is made larger than the number of teeth of the axle gear 5. Even if the diameter of the front wheel 1 is smaller than the front wheel of the popular rear-wheel drive bicycle, the traveling distance per one rotation of the crank 3 with the pedal is driven by the speed increasing drive mechanism 2 as compared with the case where the front wheel 1 is directly driven by the pedal. The pilot will be able to speed up easily.

  The speed increasing drive mechanism 2 positions the chain 11 so that it can be applied to the internal gear of the large gear 10 and the axle gear 5 by the chain guide 7, and rotates the crank 3 with a pedal integrated with the large gear 10. The rotation shaft of the axle 5a, the rotation shaft of the large gear 11 and the rotation shaft of the pedaled crank 3 are coincident with each other. Therefore, it is stable mechanically and can effectively absorb the downward force generated when the pilot turns the pedaled crank 3 from above to improve stability and safety. The feeling can be eliminated. This is remarkable when the speed increasing drive mechanism 2 is applied to a front wheel of a bicycle. Further, by transmitting the rotation of the large gear 10 to the axle gear 5 via the chain 11, the region where the driving force is transmitted on the axle gear 5 is broadened compared with the case where the gears are directly meshed with each other. Load is distributed and safety is increased. In particular, when the chain 11 is passed in the vertical direction as shown in FIG. 5, the meshing with the large gear 10 and the movement of the chain 11 are strengthened by the effect of gravity, and an effective driving force is obtained.

  FIG. 7 shows the appearance of a bicycle 17 in which the speed increasing drive mechanism 2 is attached to the front wheel 1. The bicycle 17 includes a handle 12a, a fork 12b, a head tube 12 for holding them, a front wheel 1 to which the speed increasing drive mechanism 2 is attached, a seat tube 13, a seat stay 14, a rear wheel 14a, and a saddle 15 on which a driver sits. Yes. In a diamond frame generally used as a bicycle frame structure, the lower end of the seat tube is connected to the chain stay and the down tube by a bottom bracket shell located slightly below the front wheel of the saddle. However, in the bicycle 17, the upper end of the seat tube 13 is connected to the saddle 15, and the lower end is connected to the vicinity of the fork outlet 12 c of the head tube 12. The seat stay 14 has an upper end connected to the saddle 15 and a lower end connected to the rear wheel shaft 14b.

  With such a configuration, the top tube, the down tube, and the chain stay can be omitted from the frame structure of the bicycle 17. Further, in the case of a normal rear wheel drive type bicycle, a chain necessary for driving the rear wheel with a pedal provided below the saddle is also unnecessary. However, in order to maintain the strength of the structure, it is necessary to use a frame pipe (the seat tube 13 and the seat stay 14) having sufficient strength. Can be manufactured at low cost.

  Therefore, the frame structure can be simplified, and the number of parts and man-hours can be reduced during manufacturing. Also, when a folding mechanism is added, it is not necessary to consider the rear wheel drive chain or down tube processing method, and a folding mechanism with a simple structure is sufficient. For example, if the connecting portion between the seat tube 13 and the saddle 15 and the connecting portion between the seat stay 14 and the saddle 15 are respectively lockable, the two connecting portions are rotated so that the distance between the front wheel 1 and the rear wheel 14a is increased. Can be folded to narrow.

  The speed increasing drive mechanism 2 can be applied not only to bicycles but also to general vehicles that drive wheels with a crank or pedal. For example, when applied to a wheelchair, the speed increasing drive mechanism 2 may be provided on the outer sides of the left and right wheels.

Front view of the speed increasing drive mechanism attached to both sides of the wheel 2 (a) is a perspective view of an axle gear attached to the axle, FIG. 2 (b) is a perspective view of an axle passing through the fork, and FIG. 2 (c) is an illustration of a fork equipped with a speed increasing drive mechanism mounting plate. Perspective view Perspective view of the inner case of the speed increasing drive mechanism, chain guide and crank with pedal 4 (a) is a front view of a crank with a pedal and a large gear, and FIG. 4 (b) is a side view thereof. Side view of chain meshing with axle gear and chain guide 6 (a) is a side view of a large gear that meshes with an axle gear and a chain, FIG. 6 (b) is a side view of the chain guide, and FIG. 6 (c) is a front view of the chain guide. External view of a bicycle with a speed increasing drive mechanism on the front wheels and a simplified frame

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Front wheel, 2 ... Speed-up drive mechanism, 3 ... Crank with pedal, 4 ... Rotating shaft of crank with pedal, 5 ... Axle gear, 5a ... Axle, 6 ...・ Hole for axle penetration, 7 ... Chain guide, 8 ... Inner case, 9 ... Outer case, 10 ... Large gear, 10a ... Spoke, 11 ... Chain, 12 ... Head tube, 12a ... handle, 12b ... fork, 12c ... fork outlet, 12d ... speed increasing drive mechanism mounting plate, 12e ... axle bearing hole, 12f ... fork Screw hole on the side, 12g ... Screw hole in the inner case, 13 ... Seat tube, 14 ... Seat stay, 14a ... Rear wheel, 14b ... Shaft part of the rear wheel, 15 ... Saddle, 16 ... case, 17 ... bicycle

Claims (4)

  An inner case with a hole for penetrating the axle, a chain guide attached to the inner end of the inner case, a crank with a pedal, an outer case through which the rotating shaft of the crank with a pedal passes, and a hole in the inner case It is integrated with the axle gear that is attached to the end of the penetrating axle and is located in the case formed by the inner case and the outer case, the chain that is hung on this axle gear and the chain guide, and the crank with pedal. A speed increasing drive mechanism having a large gear with internal teeth meshing with a chain, wherein the rotation center of an axle, the rotation center of a large tooth, and the rotation center of a rotation shaft of a crank with a pedal coincide.   A bicycle comprising the speed increasing drive mechanism according to claim 1.   A wheelchair comprising the speed increasing drive mechanism according to claim 1.   A speed increasing drive mechanism according to claim 1 is mounted on a front wheel, a head tube for supporting a handle and a fork, a seat tube having one end connected to a saddle and the other end connected to the head tube near the fork outlet, A bicycle having a seat stay having one end connected to the saddle and the other end connected to the rear wheel axle.

Images