JP3609463B2 - Powered bicycle - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a powered bicycle equipped with a driving device that applies a propulsive force to the bicycle.
[0002]
[Prior art]
A powered bicycle that is provided with a human-powered drive system and an electric motor-driven drive system so as to assist the human-powered driving force with the driving force of the electric motor is disclosed in, for example, Japanese Patent Laid-Open No. 2-74491. It is well known. This powered bicycle detects the pedaling force input from the foot pedal, and reduces the human labor load by increasing the driving force of the electric motor when the human labor burden is large.
[0003]
Such a powered bicycle includes a power unit (drive device) having an electric motor. This power unit is for transmitting a driving force by human power and a driving force by an electric motor to a rear wheel via a chain, and has a considerably large size. This power unit is placed directly below the joint between the main tube and seat tube so that the center of gravity of the powered bicycle does not rise and does not obstruct the user when riding over the main tube. Yes.
[0004]
This power unit is connected to a main tube constituting a frame of a powered bicycle via a bracket. Here, the bracket was welded to the frame, and the power unit was connected to the bracket with bolts and nuts. Further, the tubes constituting the frame are respectively inserted into branched tubular lugs (connection members), and the tubes and the lugs are fixed by welding.
[0005]
[Problems to be solved by the invention]
However, in a powered bicycle in which the power unit is arranged as described above, it is necessary to place them in a certain high position in order to prevent the power unit from colliding with protrusions on the road surface. The position of the main tube is raised. Therefore, the user cannot ride over the main tube unless his / her leg is raised very high, which is inconvenient for a woman who wears a skirt.
[0006]
In addition, the electric motor of the power unit requires a battery to supply power, but the location where this battery is installed is optimally right after the seat tube, considering the ease of riding by the user and the center of gravity of the powered bicycle. It is thought that. In this case, however, it is necessary not to narrow the range in which the height of the seat tube can be adjusted in accordance with the user's physique.
[0007]
Furthermore, attaching the bracket to the frame by welding as described above is complicated to adjust the position and orientation of the bracket, and takes time, resulting in an increase in manufacturing cost. Also, welding the tube and the lug is similarly complicated and time-consuming, leading to an increase in manufacturing cost.
[0008]
The present invention has been made in view of the above circumstances.,It is a first object of the present invention to provide a powered bicycle in which the drive device can be in a high position. A second object of the present invention is to provide a powered bicycle that can secure a large range in which the height of the seat tube can be adjusted in accordance with the user's physique even when a battery is mounted. A third object of the present invention is to provide a powered bicycle that can be easily manufactured, shorten the time, and reduce the manufacturing cost.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention according to claim 1,
A head tube to which a handle stem for rotating the front wheel is rotatably attached;
This head tube extends diagonally downward and rearwardTheThe main tube,
A seat tube that extends upward from the rear end of the main tube and supports the seat;
Extending obliquely downward and rearward from the rear end of the main tube to the lower side of the axial center of the main tube and immediately before the rear wheel.Rear tubeWhen,
thisRear tubeFrom the rear end of theRear tubeA chain stay that is directed upward from the direction of the extension and extends substantially along the road surface toward the rear wheel axle,
AboveRear tubeIt is disposed in a concave space formed in front of the chain stay by the inclination of the chain stay, and a driving system by human power and a driving system by a prime mover are provided side by side,A foot pedal was attachedA power unit with a crankshaft attached;
Arranged immediately after the seat tube and theRear tubeWith a battery supported above
It is characterized by comprising.
[0010]
In addition, in the invention according to claim 2, in addition to the feature according to claim 1, the main tube, the seat tube, and theRear tubeA connecting member for connecting
The tube and the connecting member are integrated by disposing the tube in a mold and casting the connecting member.
[0011]
Furthermore, in the invention according to claim 3, the claim1In addition to the features described inThe main tube was curved so as to be recessed downward.It is characterized by that.
[0012]
[Action]
According to the first aspect of the present invention, since the power unit can be disposed at a relatively high point, the power unit can be protected from road surface projections and the like. Moreover, since the battery can be placed at a relatively low point, it has a low center of gravity and a wide seat height adjustment range can be secured..
[0013]
In invention of Claim 2Accordingly, it is easy to adjust the position and direction of the tube with respect to the connecting member, and it is possible to eliminate time-consuming welding work. Further, for example, by forming a bolt insertion hole in the tube at the time of casting, it is easy to adjust the position and direction of the bracket, and time-consuming welding work can be eliminated. Therefore, the manufacturing time can be shortened. As a result, the manufacturing cost can be greatly reduced.
[0014]
In invention of Claim 3According to this, even at a position where the power unit is separated from the ground directly below the joint portion between the seat tube and the main tube, the user can easily get on by passing the leg over the curved portion of the main tube. This is particularly convenient because even if the woman wearing the skirt is a user, the user can easily cross over and get on.
[0015]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
(1) First embodiment
A. Overall configuration of the embodiment
First, a first embodiment according to the present invention will be described with reference to FIGS.
In this embodiment, a rear tube extending obliquely downward and rearward from the rear end of the main tube to a position below the axial extension direction of the main tube and immediately before the rear wheel, and from the rear end of the rear tube, A chain stay that is directed upward from the extension direction and extends substantially along the road surface toward the rear wheel shaft, and an upward concave space formed in front of the chain stay by the inclination of the rear tube. It has a power unit and a battery (battery) arranged immediately after the seat tube.
FIG. 1 is a side view showing a cover 90 (FIG. 2) of a powered bicycle having a frame according to the present invention. In the figure, reference numeral 10 denotes a main tube, and a head tube 11 is fixed to the front portion of the main tube 10. A handle stem 12 is inserted into the head tube 11 so as to be rotatable about the axis of the head tube 11. A pair of left and right front forks 16 are fixed to the lower portion of the handle stem 12, and a front wheel 14 is rotatably attached to the front fork 16. A handle bar 18 extending to the left and right is fixed to the upper portion of the handle stem 12.
[0016]
The main tube 10 extends obliquely downward and rearward from the front portion, and a seat tube 22 and one rear tube 26 are fixed to the rear end thereof. Further, the main tube 10 is curved so as to be recessed downward, so that even if the user is, for example, a woman wearing a skirt, the main tube 10 can be easily crossed over and boarded. It is made like that.
[0017]
The seat tube 22 supports the seat post 19 to which the saddle 20 is fixed. A pair of chain stays 27 are fixed to the rear tube 26, and the chain stay 27 and the seat tube 22 are connected by a pair of left and right seat stays 24. As shown in the figure, the seat tube 22, seat stay 24, rear tube 26, and chain stay 27 are substantially triangular so that the weight when the user gets on can be supported. A rear wheel 28 is rotatably attached to a connecting portion between the seat stay 24 and the chain stay 27.
[0018]
A power unit (drive device) 34 is attached below the seat tube 22. This power unit 34 is a unit composed of a drive system by human power, a drive system by an electric motor, and a resultant force mechanism of both. 32 is fixed. A foot pedal 31 is attached to each crank 32. Reference numeral 36 denotes an electric motor.
[0019]
The rotation of the crankshaft 33 when the user steps on the foot pedal 31 is transmitted to the chain 37 through the mechanism in the power unit 34 and further to the rear wheel 28 via the free wheel 29, and the rear wheel 28 rotates. This power bicycle is propelled. On the other hand, when the electric motor 36 is driven, the rotation of the rotor is transmitted to the chain 37 through another mechanism inside the power unit 34, and the rear wheel 28 is also rotated by this. In this way, this powered bicycle is provided with a drive system by human power transmitted by the crankshaft 33 and a drive system by the electric motor 36.
[0020]
A casing 41 is fixed to the lower portion of the main tube 10. A controller 42 is provided inside the casing 41. The electric motor 36 is supplied with a driving current from a rechargeable battery 39. The battery 39 is housed in an inner box 38 in two upper and lower stages, the inner box 38 is further housed in an outer box 40, and the outer box 40 is disposed between the seat tube 22 and the rear wheel 28. The seat tube 22, the seat stay 24, and the rear tube 26 are supported. The battery 39 supplies current to the electric motor 36, and the controller 42 increases or decreases this current.
[0021]
That is, when the driving force of human power, that is, the pedaling force applied through the foot pedal 31, the crank 32, and the crankshaft 33 is large, the controller 42 increases the current flowing through the electric motor 36, and when the pedaling force is small, the controller 42 The current flowing through the motor 36 is reduced. As a result, when the burden of human power is large, the driving force of the electric motor 36 can be increased to reduce the burden of human power. As the electric motor 36, for example, a permanent magnet DC motor or a series DC motor can be used. The controller 42 is preferably a chopper type controller that changes a DC voltage on / off time ratio (duty ratio) in accordance with torque.
[0022]
FIG. 2 is a side view showing a completed state of the powered bicycle. A cover 90 that covers the main tube 10 and the like is attached to the body of the powered bicycle. The cover 90 includes an upper cover 91 and a lower cover 92. The upper cover 91 covers the main tube 10, the lower portion of the seat tube 22, the rear tube 26, and the lower portion of the outer box 40 of the battery 39, The lower cover 92 covers the electric motor 36 and the casing 41. The upper surface of the upper cover 91 is curved along the main tube 10.
[0023]
B. Frame structure
Now, the details of the configuration of the frame of this powered bicycle will be described with reference to FIGS.
B-1. Frame front configuration
FIG. 3 shows a connection structure of the head tube 11, the handle stem 12, the front fork 16, and the main tube 10. The head tube 11 includes a cylindrical tube main body 50 and a cylindrical head lug 51 that is connected obliquely thereto. Among these, a stainless steel tube 49 is inserted into the tube main body 50, and a cylindrical upper end portion 16a of the front fork 16 is inserted into the tube main body 50 from below. Further, the lower end portion of the handle stem 12 is inserted into the tube 49 from above, and this lower end portion is also inserted into the upper end portion 16 a of the front fork 16.
[0024]
The handle stem 12 is fixed to the front fork 16 by a fastening ring 52, so that the handle stem 12 and the front fork 16 are united and rotated about the axis of the head tube 11 by operating the handle. In addition, the handle stem 12 is prevented from moving up and down.
[0025]
On the other hand, the head lug 51 is formed integrally with the tube main body 50 and extends obliquely downward and rearward from the middle of the tube main body 50. The front end of the main tube 10 is fixed in the head lug 51. In addition, a pin 53 for mounting the cover 90 projects from the head lug 51.
[0026]
B-2. Method for manufacturing the front part of the frame
Next, a procedure for connecting the main tube 10 to the head lug 51 will be described. In this embodiment, the head lug 51 is formed by casting, specifically by die casting, and at the same time, the head lug 51 is integrated with the tube body 50 and the main tube 10. First, the tube main body 50 with the tube 49 inserted is placed in a pair of molds (not shown). Before and after this, the front end of the main tube 10 is also placed in the mold. Then, molten metal such as aluminum is injected into the mold and solidified, and then released. Here, the tube body 50 may be disposed in the mold without the tube 49 being inserted into the tube body 50.
[0027]
B-3. Frame rear configuration
FIG. 4 shows a connection structure of the main tube 10, the seat tube 22, the rear tube 26, and the chain stay 27. Of these, the main tube 10, the seat tube 22, and the rear tube 26 are connected by a middle lug (connecting member) 54, and the rear tube 26 and the chain stay 27 are connected by a hanger lug (connecting member) 55. As will be described later, these lugs 54 and 55 are made of aluminum by die casting.
[0028]
The reason for providing the two lugs 54 and 55 in this way will be described. First, in the case of a bicycle using only ordinary human power, the position of the crankshaft 33 and the center position of the middle lug 54 shown in FIG. 1 can be substantially matched, and two chainstays can be formed from the lugs arranged there. The chain stays can be connected to the rear wheel shaft. However, in the case of the bicycle of this embodiment, the power unit 34 is provided to assist the power with the electric motor 36. For this reason, the position of the middle lug 54 and the position of the crankshaft 33 cannot be matched. Further, in order to prevent the power unit 34 from colliding with a protrusion on the road surface, it is necessary to set these to a certain level.
[0029]
Therefore, the middle lug 54 must be positioned higher than a normal bicycle. In this case, it is also conceivable to branch the two chain stays 27 directly from the middle lug 54 and connect these chain stays 27 to the shaft of the rear wheel 28. However, in this embodiment, in consideration of the strength of the frame, the power unit 34 is suspended and the rear tube 26 for supporting the battery 39 is provided. Therefore, a hanger lug 55 that connects the rear tube 26 and the chain stay 27 is required.
[0030]
In order to ensure a large adjustment range of the height of the saddle 20 in accordance with the user's physique, it is desirable to place the battery 39 disposed behind the seat tube 22 as low as possible. Further, it is necessary to prevent the chain 37 that transmits power from the power unit 34 to the rear wheel 28 from hitting the hanger lug 55. For these reasons, the position of the hanger lug 55 is considerably lower than the middle lug 54.
[0031]
As shown in FIG. 4, the middle lug 54 has three cylindrical portions 56, 57, and 58 that are integrally formed. Among these, the rear end of the main tube 10 is fixed in the cylindrical portion 56, the lower end of the seat tube 22 is fixed in the cylindrical portion 57, and the front end of the rear tube 26 is fixed in the cylindrical portion 58. Has been. A convex portion 59 is formed between the cylindrical portions 57 and 58.
[0032]
Further, one bracket 60 is fixed to the cylindrical portion 56, and one bracket 61 is also fixed to the cylindrical portion 58. These brackets 60 and 61 are formed of steel plates. As shown in FIGS. 4 to 6, the bracket 60 is fixed to a convex portion 56 a formed in the cylindrical portion 56 by two bolts 68. Further, as shown in FIGS. 4, 7, and 8, the bracket 61 is fixed to a convex portion 58 a formed on the cylindrical portion 58 with a bolt 69.
[0033]
On the other hand, as shown in FIG. 9, the hanger lug 55 includes a cylindrical portion 63, a pair of left and right cylindrical portions 64, and a connecting portion 65 that connects them. Among these, the rear end of the rear tube 26 is fixed in the cylindrical portion 63, and the front end of the chain stay 27 is fixed to the cylindrical portion 64. Further, the same bracket 61 as described above is fixed to the cylindrical portion 63. Here, the bracket 61 is fixed to a convex portion 63 a formed in the cylindrical portion 63 by a bolt 70. The connecting portion 65 is provided with a convex portion 66 protruding upward. For convenience of the manufacturing method described later, as shown in FIGS. 4 and 7, the cylindrical portion 58 of the middle lug 54 and the cylindrical portion 63 of the hanger lug 55 are connected by a cylindrical portion 62. Is covered with cylindrical portions 58, 62, 63.
[0034]
Further, the cylindrical portion 56 of the middle lug 54 is formed with a convex portion 56 b at a position facing the bracket 60. Bolts 71 are inserted into the convex portions 56 b and the bracket 60, and nuts 73 are screwed onto the ends of the bolts 71. The cylindrical portion 62 has a convex portion 62 a at a position facing the bracket 61. A bolt 72 is inserted into the convex portion 62 a and the bracket 61, and a nut 74 is screwed to an end portion of the bolt 72.
[0035]
These bolts 71 and 72 are for suspending the power unit 34 below the main tube 10 and the rear tube 26 as shown in FIG. Further, the outer box 40 of the battery 39 is fixed and supported on the convex portion 59 formed on the middle lug 54 and the convex portion 66 formed on the hanger lug 55.
[0036]
Here, the reason why the power unit 34 is attached to the main tube 10 and the rear tube 26 via the brackets 60 and 61 is that the casing of the power unit 34 is formed of aluminum by die casting. The lugs 54 and 55 to which the brackets 60 and 61 are fixed as described above are also formed of aluminum by die casting. Usually, when castings are fastened directly with bolts or the like, they are easily broken by receiving fastening force. This is not an exception when fastening aluminum products formed by die casting. Therefore, in this embodiment, the brackets 60 and 61 are fixed to the lugs 54 and 55, and the power unit 34 is suspended by the lugs 54 and 55 to prevent cracking of the casings of the lugs 54 and 55 and the power unit 34. .
[0037]
In this embodiment, since the main tube 10 extends obliquely downward and rearward and is curved so as to be recessed downward, the power unit 34 is grounded directly below the joint between the seat tube 22 and the main tube 10. Even at a position away from the user, the user can easily get on with the leg passing over the curved portion of the main tube 10. This is particularly convenient because even if the woman wearing the skirt is a user, the user can easily cross over and get on.
[0038]
B-4. Method for manufacturing the rear part of the frame
Next, a procedure for connecting the middle lug 54, the main tube 10, the seat tube 22, the rear tube 26, the hanger lug 55, and the chain stay 27 will be described. In this case, the lugs 54 and 55 are formed by die casting using a pair of molds (not shown), and at the same time, the middle lug 54 is integrated with the main tube 10, the seat tube 22 and the rear tube 26. The hanger lug 55 is integrated with the rear tube 26 and the chain stay 27. 5 and 7, the symbol P <b> 1 indicates the dividing line of this mold.
[0039]
First, the rear end of the main tube 10, the lower end of the seat tube 22, the rear tube 26, and the front ends of the chain stays 27 are arranged at predetermined positions in the mold. Then, molten metal such as aluminum is poured into the mold and solidified, and then released.
[0040]
Accordingly, the main tube 10, the middle lug 54, the seat tube 22, the rear tube 26, the hanger lug 55, and the chain stay 27 can be connected. At the same time, convex portions 59 and 66 are formed on the middle lugs 54 and 55, respectively. In this case, holes for inserting bolts 68, 69, 70 for fixing the brackets 60, 61 are formed.
[0041]
According to this method, the bracket 60, the bolt 68, the bracket 61, the bolts 69 and 70, the main tube 10, the seat tube 22, the rear tube 26, and the chain stay 27 are simply disposed in the mold. In addition, it is possible to easily adapt the direction and direction, and it is possible to significantly reduce the manufacturing time as compared with welding. Therefore, the manufacturing cost can be greatly reduced.
[0042]
After the frame is manufactured in this manner, the brackets 60 and 61 are attached with the bolts 68, 69 and 70, and the casing of the power unit 34 is disposed between the convex portion 56b and the bracket 60 and between the convex portion 62a and the bracket 61. The bolts 71 and 72 are inserted into holes formed in these in advance, and the nuts 73 and 74 are screwed into the bolts 71 and 72.
[0043]
(2) Second embodiment
A. Frame structure
Next, a second embodiment according to the present invention will be described with reference to FIGS. Here, the overall structure of the frame is the same as that of the first embodiment shown in FIG. Also, the structure of the front portion of the frame, that is, the structure in which the rear end portion of the handle stem 12 and the upper end portion of the front fork 16 are inserted into the tube body 50 of the head tube 11 and the front end portion of the main tube 10 is fixed to the head lug 51. This is the same as the first embodiment shown in FIG. 4, and the manufacturing method is also the same.
[0044]
A-1. Frame rear configuration
Now, the configuration of the rear part of the frame in the second embodiment, which is different from the first embodiment, will be described. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate. Also in the second embodiment, as shown in FIG. 10, the middle lug 54 has three cylindrical portions 56, 57, 58 formed integrally. Among these, the rear end of the main tube 10 is fixed in the cylindrical portion 56, the lower end of the seat tube 22 is fixed in the cylindrical portion 57, and the front end of the rear tube 26 is fixed in the cylindrical portion 58. Has been. As shown in FIGS. 10 and 11, two brackets 60 similar to those described above are fixed to both sides of the cylindrical portion 56 of the middle lug 54, one by one. Here, the bracket 60 is fixed to the two convex portions 56 a formed on the cylindrical portion 56 by two bolts 80 and a nut 81 that is screwed thereto.
[0045]
A total of two brackets 61 similar to those described above are also fixed to both sides of the cylindrical portion 58 of the middle lug 54 one by one. Here, the bracket 61 is fixed to a convex portion 58 a formed in the cylindrical portion 58 by a bolt 82 and a nut 83 that is screwed to the bolt 82.
[0046]
On the other hand, the hanger lug 55 is formed by integrating a cylindrical portion 63, a pair of left and right cylindrical portions 64, and a connecting portion 65 that connects them. Among these, the rear end of the rear tube 26 is fixed in the cylindrical portion 63, and the front end of the chain stay 27 is fixed to the cylindrical portion 64. Further, the same bracket 61 as described above is also fixed to both sides of the cylindrical portion 63. Here, the bracket 61 is fixed to a convex portion 63 a formed in the cylindrical portion 63 by a bolt 84 and a nut 85 screwed to the bolt 84.
[0047]
As described above, the second embodiment is different from the first embodiment in that the brackets 60 and 61 are fixed on both sides of the lugs 54 and 55.
[0048]
A-2. Method for manufacturing the rear part of the frame
Next, a procedure for connecting the middle lug 54, the main tube 10, the seat tube 22, the rear tube 26, the hanger lug 55, and the chain stay 27 will be described. Also in this embodiment, the lugs 54 and 55 are formed by die casting using a pair of molds (not shown), and at the same time, the middle lug 54 is integrated with the main tube 10, the seat tube 22 and the rear tube 26. The hanger lug 55 is integrated with the rear tube 26 and the chain stay 27. In FIG. 11 thru | or 13, the virtual line P2 has shown the dividing line of the metal mold | die.
[0049]
First, the rear end of the main tube 10, the lower end of the seat tube 22, the rear tube 26, and the front ends of the chain stays 27 are arranged at predetermined positions in the mold. Then, a molten metal such as aluminum is poured into the mold and solidified, and then released.
[0050]
Accordingly, the main tube 10, the middle lug 54, the seat tube 22, the rear tube 26, the hanger lug 55, and the chain stay 27 can be connected. At the same time, convex portions 59 and 66 are formed on the middle lugs 54 and 55, respectively.
[0051]
According to this method, it is possible to easily adapt the positions and directions of the main tube 10, the seat tube 22, the rear tube 26, and the chain stay 27 by appropriately arranging them in the mold. In addition, the manufacturing time can be greatly reduced as compared with welding. Therefore, the manufacturing cost can be greatly reduced.
[0052]
After the frame is manufactured in this way, the brackets 60 and 61 are attached with the bolts 80, 82 and 84 and the nuts 71, 83 and 85, and between the convex portion 56b and the bracket 60 and between the convex portion 62a and the bracket 61. The casing of the power unit 34 is disposed, and the bolts 71 and 72 are inserted into holes formed in these in advance, and the nuts 73 and 74 are screwed into the bolts 71 and 72.
[0053]
In this embodiment, as shown in FIGS. 11 to 13, unlike the first embodiment, it is not necessary to bend the dividing line P2 of the mold within one cylindrical portion. Therefore, as compared with the first embodiment, the length of the burr generated along the secant line P can be reduced, the mold design is easy, and the manufacture thereof is also simple. For this reason, it is possible to further reduce manufacturing costs.
[0054]
(3) Example of change
Note that the powered bicycle according to the above-described embodiment assists power by the electric motor 36, but is not limited to this, and is a powered bicycle using an internal combustion engine instead of the electric motor 36. Also good.
In the above-described embodiment, the driving force of the electric motor 36 is increased when the load of human power is large. However, the present invention is not limited to this, and the driving force of the electric motor 36 can be adjusted regardless of the load of human power. It can be a powered bicycle.
[0055]
【The invention's effect】
As described above, in the invention according to the first aspect, the power unit can be placed at a high position, has a low center of gravity, and can ensure a wide seat height adjustment range.The
[0056]
And claims2In the invention described in,Manufacturing costs can be significantly reduced.In the invention according to claim 3, the user can easily get on and off.
[Brief description of the drawings]
FIG. 1 is a side view showing a powered bicycle according to a first embodiment of the present invention with a cover removed.
FIG. 2 is a side view showing a completed state of the powered bicycle.
FIG. 3 is a side view showing a front portion of the frame of the powered bicycle according to the first embodiment.
FIG. 4 is a side view showing the rear part of the frame of the powered bicycle according to the first embodiment.
FIG. 5 is a view taken along the line VV in FIG. 4;
6 is a view taken along the line VI-VI in FIG. 4;
7 is a view taken along the line VII-VII in FIG. 4;
8 is a view taken in the direction of arrows along the line VIII-VIII in FIG. 4;
FIG. 9 is a bottom view showing a hanger lug used in the frame of the powered bicycle according to the first embodiment.
FIG. 10 is a side view showing a rear part of a frame of a powered bicycle according to a second embodiment of the present invention.
11 is an arrow view along the line XI-XI in FIG.
12 is an arrow view along the line XII-XII in FIG.
FIG. 13 is a bottom view showing a hanger lug used for a frame of a powered bicycle according to a second embodiment.
[Explanation of symbols]
10 main tube, 11 head tube, 12 handle stem,
14 front wheels, 20 saddles (seats), 22 seat tubes,
26 Rear tube, 27 Chain stay, 28 Rear wheel,
31 foot pedals, 32 cranks, 34 power units,
36 electric motor, 39 battery, 42 controller,
51 head lugs, 54 middle lugs (connection members),
55 Hanger lug (connecting member), 60 bracket, 61 bracket.

Claims (3)

A head tube to which a handle stem for rotating the front wheel is rotatably attached;
A main tube extending diagonally downward and rearward from the head tube;
A seat tube that extends upward from the rear end of the main tube and supports the seat;
A rear tube extending obliquely downward and rearward from the rear end of the main tube to the lower side of the axial center of the main tube and immediately before the rear wheel,
A chain stay extending to approximately along the road surface toward the rear wheel shaft from the rear end of the rear tube directed upward from the extension direction of the rear tube,
A crankshaft with a foot pedal attached thereto is disposed in an upwardly recessed space formed in front of the chain stay by the inclination of the rear tube , and is provided with a driving system driven by manpower and a driving system driven by a prime mover. The attached power unit,
A powered bicycle comprising a battery disposed immediately after the seat tube and supported on the rear tube . A connecting member that connects the main tube, the seat tube, and the rear tube ;
The powered bicycle according to claim 1, wherein the tube and the connecting member are integrated by disposing the tube in a mold and casting the connecting member. The powered bicycle according to claim 1, wherein the main tube is curved so as to be recessed downward.

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