JP4247765B2 - Bicycle with driving force assist device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bicycle provided with a driving force assisting device that transmits a driving force from a driving source such as an electric motor to wheels.
[0002]
[Prior art]
A bicycle provided with a driving force assisting device that transmits driving force from a motor to wheels in addition to human power driving means that is driven by human power is already known.
[0003]
This type of bicycle with a driving force assisting device is disclosed in Japanese Patent Application Laid-Open No. 8-34383, in which an electric motor and a speed reducer are mounted near the crank part of the frame and coaxial with the front sprocket on which a chain for human power transmission is hung. A device is disclosed that includes a small-diameter gear and is provided with a driving force assisting device that transmits the driving force of the electric motor to the front gear via the reduction gear and the small-diameter gear.
[0004]
In Japanese Utility Model Laid-Open No. 56-46494, an electric motor of a driving force assisting device is attached to a frame, a driving gear and a chain are arranged in the vicinity of the electric motor, and an auxiliary is provided on the opposite side of the rear sprocket for transmitting human power. There is disclosed a device in which a rear gear for driving force transmission is provided and a driving force auxiliary device for transmitting the driving force of an electric motor to a rear wheel via a chain and a rear gear for transmitting auxiliary driving force is disclosed.
[0005]
[Problems to be solved by the invention]
However, as disclosed in Japanese Patent Application Laid-Open No. 8-34383, in a structure in which an electric motor or a reduction gear is attached to the frame side, the driving force of the electric motor is applied to a small-diameter gear arranged coaxially with the front sprocket. In order to properly transmit the motor via the reducer, the electric motor, the reducer, and the small-diameter gear are assembled by assembling the frame and crank part during bicycle assembly in order to properly mesh the electric motor and reducer with the small-diameter gear. After assembling, it is necessary to accurately adjust the mounting positions of the electric motor or reduction gear and the small-diameter gear. As a result, the position adjustment takes a lot of time and effort.
[0006]
Further, as disclosed in Japanese Utility Model Laid-Open No. 56-46494, a rear gear for auxiliary driving force transmission, in which an electric motor of a driving force auxiliary device is attached to a frame and attached to the opposite side of a rear sprocket for human power transmission. In the case where the driving force of the electric motor is transmitted to the rear wheels via the chain and the rear gear, each mounting position of the electric motor, the chain, and the rear gear for transmitting the auxiliary driving force at the time of assembly is similar to the above. Not only does it take a lot of time and effort to make adjustments, but when adjusting the position of the rear wheel to adjust the tension of the chain for transmitting human power as appropriate by using a bicycle, the auxiliary driving force transmission chain and electric The position of the motor had to be adjusted, and much time and effort were required.
[0007]
The present invention solves the above-described problem, and the driving force assisting device can be assembled and arranged at an appropriate position without much time and effort, and the driving force assisting device can be adjusted even when the position of the rear wheel is adjusted. An object of the present invention is to provide a bicycle with a driving force assisting device that does not require position adjustment.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a bicycle with a driving force assisting device provided with a driving force assisting device that transmits driving force from a driving source to wheels in addition to human power driving means that is driven by human power. The rotating member that is driven and rotated by human power is mounted with a rotatable supporting device, and the driving force assisting device is integrally supported by the rotating member via the supporting device. A rotation stopper is provided to prevent rotation around the shaft center, and the driving force assisting device is connected to the rotating member to transmit the driving force of the driving force assisting device to the rotating member. The rotating member is integrated with the rear wheel. The rear drum is a drum for braking the rear wheel, and a gear portion is formed on the outer peripheral surface of the drum for braking, and the driving force of the driving force assisting device is transmitted to the gear portion .
[0009]
According to the present invention, the driving force assisting device can be assembled and arranged at an appropriate position without much time and effort, and the position of the driving force assisting device is adjusted even when adjusting the position of the rear wheel. No need.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention according to claim 1 is a bicycle with a driving force assisting device provided with a driving force assisting device that transmits driving force from a driving source to wheels in addition to human power driving means that is driven by human power. A rotatable support device is mounted on the rotating member that is driven and rotated by the rotation member, and the driving force assisting device is integrally supported by the rotating member via the supporting device, and the driving force assisting device is an axis of the rotating member. A rotation stopper is provided to prevent the rotation of the rotating member, and the driving force assisting device is connected to the rotating member to transmit the driving force of the driving force assisting device to the rotating member. The rotating member is integrated with the rear wheel. The brake drum is a rotating rear wheel, and a gear portion is formed on the outer peripheral surface of the brake drum, and the driving force of the driving force assisting device is transmitted to the gear portion .
[0011]
According to this configuration, since the driving force assisting device is integrally attached to the rotating member via the support device, it is only necessary to attach the driving force assisting device to an appropriate position with respect to the rotating member. As in the case where the drive source is attached to the frame, the position adjustment does not have to be performed again after assembling the parts of the drive force assisting device again with much time and effort.
[0012]
Further , according to this configuration, even when the position of the rear wheel is adjusted, the driving force assisting device is also moved integrally with the braking drum that is the rotating member of the rear wheel. You don't have to.
[0015]
Hereinafter, a bicycle with a driving force assisting device according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the frame 1 of the bicycle with a driving force assisting device is composed of a standing pipe 2, an upper pipe 3, a seat stay 4, a chain stay 5, a head pipe 6 and the like similar to a general bicycle. Yes.
[0016]
1 to 4 is a driving force assisting device 20 for transmitting a driving force from an electric motor 21 as a driving source to the rear wheel 7, and a braking drum 8 as a rotating member provided on the rear wheel 7. Is integrally disposed in front of the.
[0017]
The brake drum 8 is used as a part of an inwardly expanding brake device 10 in which a pair of shoes 9 are pressed against the inner peripheral surface of the brake drum 8. The brake drum 8 is groove-fitted to the hub 16 of the rear wheel 7, 16 and rotate together. When the brake lever 12 provided in the vicinity of the handle 11 is gripped, the cam 15 is rotated via the rear brake wire 13 or the brake crank 14 (see FIG. 3), and the shoe 9 is spread and the brake drum is rotated. 8 is brought into contact with the inner peripheral surface of 8 and a braking operation is performed.
[0018]
A gear portion 8 a is integrally formed on the outer periphery of the braking drum 8, and a first cover 24 of the driving force assisting device 20 is attached to the braking drum 8 via a bearing 23 as a support device. The driving force assisting device 20 includes the first cover 24 disposed near the rear wheel 7, a second cover 25 that is attached to the first cover 24 by screws, and the first cover 24 and the second cover 24. An electric motor 21 that is covered by a cover 25 and whose rotation drive shaft is supported by a bearing 26, and a support shaft 28 that is supported by the first cover 24 and the second cover 25 are rotatably attached via a bearing 29. The one-way clutch 30a is comprised from the transmission gear 30 with which it was equipped internally.
[0019]
The transmission gear 30 is not only formed with a gear portion 30 b that meshes with the gear portion 8 a of the braking drum 8, but also formed with a hypoid gear 30 c on one side surface. The hypoid gear 30 c is a rotation of the electric motor 21. It is meshed with a pinion 21a formed on the drive shaft. The driving force of the electric motor 21 is transmitted to the rear wheel 7 via the transmission gear 30 and the braking drum 8. When the rear wheel 7 is rotated in the reverse direction, the one-way clutch 30 a is idled and the rotational force is not transmitted to the electric motor 21.
[0020]
As shown in FIGS. 2 to 4, the transmission gear 30 including the one-way clutch 30 a and the electric motor 21 are arranged in front of the braking drum 8 so as to be along the circumferentially arranged surface of the braking drum 8 as viewed from above. It is arrange | positioned in the state attached integrally. Also, the semi-cylindrical portions 24a and 25a formed respectively on the first cover 24 and the second cover 25 are engaged with the chain stay 5 via the elastic bodies 31 and 32 that are mounted in two parts, thereby assisting in driving force. The device 20 is prevented from rotating around the axis of the bearing 23 attached to the outer peripheral surface of the brake drum 8.
[0021]
Reference numerals 33 to 35 denote fixing bosses for fixing the first cover 24 and the second cover 25 with screws. Reference numeral 36 denotes a chain stay 5 which fixes the first cover 24 and the second cover 25 with screws. It is a fixing plate part to be joined. In FIG. 2, 17 is a spoke attached to the hub 16, 18 is a brake cover, and is fixed to the hub 16 with a nut 19 as shown in FIG.
[0022]
Further, as shown in FIG. 1, a control box 42 for controlling the driving force assisting device 20 is disposed behind the handle bar 41, and the control box 42 rotates in conjunction with the handle 11. It has become. The control box 42 is provided with a key insertion part for inserting the operation key 43 and a display part, and a battery 44 is also mounted. Further, a spare battery 45 is also mounted behind the standing pipe 2.
[0023]
In FIG. 1, 46 is a pedal, 47 is a crankshaft, and 48 is a chain that transmits human power to the rear wheel 7.
In the above-described configuration, when the bicycle is assembled, the driving force assisting device 20 may be integrally attached to the braking drum 8 of the rear wheel 7 via the bearing 23 in advance. At this time, the gear portion 8a of the braking drum 8 is used. Are attached so that the gear portion 30 b of the transmission gear 30 meshes well and the hypoid gear 30 c of the transmission gear 30 meshes well with the pinion 21 a of the electric motor 21.
[0024]
As a result, the driving force assisting device 20 is integrally attached to the braking drum 8, so that it is not necessary to adjust the position of the driving force assisting device 20 when the bicycle is assembled thereafter. After the braking drum 8 to which the driving force assisting device 20 is attached is assembled to the bicycle, the semi-cylindrical portions 24a and 25a formed on the first cover 24 and the second cover 25, the elastic body 31, respectively. 32 is engaged with the chain stay 5, which only serves as a detent. Therefore, it only needs to be engaged with each other, and no strict position adjustment is required.
[0025]
Further, even when the position of the rear wheel 7 is adjusted, if the position of the rear wheel 7 is adjusted, the driving force assisting device 20 is also moved integrally with the braking drum 8. It is possible to perform maintenance efficiently.
[0026]
Further, since the driving force assisting device 20 is not structured to be supported by a frame such as the chain stay 5, the same frame as that of a general bicycle can be used, and the manufacturing cost can be reduced.
[0027]
Furthermore, by providing the cylindrical electric motor 21 that is long in the front-rear direction in combination with the hypoid gear 30c, the amount of lateral protrusion of the driving force assisting device 20 can be minimized, and driving force assisting can be achieved. The device 20 can be configured compactly and can be made inconspicuous even when viewed from the side. Further, since the electric motor 21 can be disposed at a position relatively far from the hub 16 of the rear wheel 7, the stress applied to the chain stay 5 can be reduced. Can be suppressed.
[0028]
Further, by forming the gear portion 8 a on the outer periphery of the braking drum 8, the gear portion 8 a having a large diameter can be adopted, and a large reduction ratio can be realized with respect to the rotation of the electric motor 21. Further, since the braking drum 8 of the inner expansion brake device 10 in which the shoe 9 is pressed against the inner peripheral surface is used, the driving force transmission mechanism portion of the driving force auxiliary device 20 interferes with the inner expansion brake device 10. It can be arranged without doing.
[0029]
Next, a bicycle with a driving force assisting device according to another embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 6 to 8, in this bicycle with a driving force assisting device, the driving force assisting device 50 is a front driving wheel body that is externally fitted to a crank 52 via a bearing 51 serving as a support device. The front sprocket 53 is integrally attached.
[0030]
That is, the front sprocket 53 is rotatably attached to the crank portion 53 provided with the crankshaft 47 and the crank 52 via the bearing 51, and the sprocket portion 53 a meshing with the chain 48 is provided on the outer periphery of the front sprocket 53. A gear portion 53b is formed on the inner peripheral surface of the sprocket portion 53a. An electric motor 55 as a driving source of the driving force assisting device 50 is attached via a coupling fitting 54 fitted on the bearing 51, and an output gear 56 attached to the rotation shaft of the electric motor 55 is connected to the front. The sprocket 53 is meshed with the gear portion 53b.
[0031]
Further, a semi-cylindrical portion 57 as a detent is fixed to the bottom portion of the electric motor 55. With the semi-cylindrical portion 57 covered on the chain stay 5, the paired semi-cylindrical portions 58 are covered from below. The semi-cylindrical parts 57 and 58 are screwed together to prevent the electric motor 55 from rotating around the crankshaft 47.
[0032]
In FIG. 6, reference numeral 59 denotes a crank bearing that rotatably supports the crankshaft 47 with respect to the hanger 60.
In the above configuration, when the bicycle is assembled, the electric motor 55 of the driving force assisting device 50 may be integrally attached to the front sprocket 53 via the bearing 51 and the connecting bracket 54 in advance. The part 53b is attached so that the output gear 56 of the electric motor 55 can mesh well.
[0033]
As a result, the driving force assisting device 50 is integrally attached to the front sprocket 53, and thereafter it is not necessary to adjust the position of the driving force assisting device 50 when the bicycle is assembled. After the front sprocket 53 to which the driving force assisting device 50 is attached is assembled to the bicycle, the semi-cylindrical portions 57 and 58 are engaged with the chain stay 5, but this only serves as a detent. Therefore, it is only necessary to engage with each other, and no strict position adjustment is required.
[0034]
In the above-described embodiment, the case where the driving force of the electric motor 55 is directly transmitted to the front sprocket 53 is described, but the present invention is not limited to this, and the driving force between the electric motor 55 and the front sprocket 53 is described. A one-way clutch may be interposed in the transmission part, and in the case of a bicycle that transmits human power with a belt instead of a chain, a driving force assisting device is integrally attached to the front gear that transmits human power with the belt. The same effect can be obtained.
[0035]
Further, in the above embodiment, the case where the braking drum 8 and the front sprocket 53 of the rear wheel 7 are used as the rotating member to which the driving force assisting devices 20 and 50 are integrally attached has been described. However, the present invention is not limited to this. The same effect can be obtained if the rotating member is driven and rotated by human power.
[0036]
【The invention's effect】
As described above, according to the present invention, a rotatable supporting device is attached to a rotating member that is driven and rotated by human power, and the driving force assisting device is integrally supported by the rotating member via the supporting device. By connecting the driving force assisting device to the rotating member and transmitting the driving force of the driving force assisting device to the rotating member, it is only necessary to attach the driving force assisting device to the rotating member at an appropriate position. As the drive source of the force assist device is attached to the frame, after assembling the components of the drive force assist device, there is no need to re-adjust the position and improve the work efficiency during assembly. To do. Further, since the driving force assisting device is not directly supported by the frame, the same frame as the conventional one can be used, and the manufacturing cost as a bicycle with the driving force assisting device can be reduced.
[0037]
In addition, by using a member that rotates integrally with the rear wheel as the rotating member, the driving force assisting device is also moved integrally with the rotating member of the rear wheel even when the position of the rear wheel is adjusted. It is not necessary to adjust the position of the force assist device, and maintenance can be performed efficiently.
[Brief description of the drawings]
FIG. 1 is an overall side view of a bicycle with a driving force assisting device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional plan view of the driving force assisting device of the bicycle with the driving force assisting device.
FIG. 3 is a partially cutaway side view of the driving force assisting device and the inward expansion brake device of the bicycle with the driving force assisting device.
FIG. 4 is a perspective view of a driving force assisting device for a bicycle with the driving force assisting device.
FIG. 5 is a perspective view of a second cover and a brake cover of the bicycle with the driving force assisting device.
FIG. 6 is a partial plan sectional view of a bicycle with a driving force assisting device according to another embodiment of the present invention.
FIG. 7 is a perspective view of an essential part of the bicycle with the driving force assisting device.
FIG. 8 is a perspective view of an essential part of the bicycle with the driving force assisting device.
[Explanation of symbols]
1 Frame 5 Chainstay 7 Rear wheel 8 Drum for braking (rotating member)
8a, 30b Gear unit 10 Inward expansion type brake device 16 Hub 20, 50 Driving force auxiliary device 21, 55 Electric motor (drive source)
21a Pinion 23, 51 Bearing (support device)
24 first cover 25 second cover 30 transmission gear 30a one-way clutch 30c hypoid gears 31, 32 elastic body 53 front sprocket (front drive wheel)
53b Gear part 57, 58 Semi-cylindrical part (non-rotating)

Claims (1)

A bicycle with a driving force assisting device provided with a driving force assisting device that transmits driving force from a driving source to wheels in addition to human power driving means that is driven by human power, and is a rotating member that is driven and rotated by human power A rotating support device is mounted on the rotating member, and the driving force assisting device is integrally supported by the rotating member via the supporting device, and the driving force assisting device is prevented from rotating around the axis of the rotating member. The driving force assisting device is connected to the rotating member to transmit the driving force of the driving force assisting device to the rotating member, and the rotating member is a rear wheel braking drum that rotates integrally with the rear wheel. A bicycle with a driving force assisting device in which a gear portion is formed on the outer peripheral surface of the braking drum and the driving force of the driving force assisting device is transmitted to the gear portion .

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