JP3697965B2 - Driving bicycle frame and driving bicycle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drive bicycle frame and a drive bicycle.
[0002]
[Prior art]
Conventionally, an electric bicycle described in JP-A-6-227474 has been known. FIG. 6 shows a side view of a conventional example, and FIG. 7 shows a main part of the conventional example. 1 is an electric bicycle, and 2 is a frame of the electric bicycle 1. The frame 2 includes a head pipe 2a that supports a front fork 4 on which a front wheel 3 is rotatably provided, a down tube 2b that extends rearward and downward from the head pipe 2a, and a lug at the rear of the down tube 2b. 5, a pair of left and right chain stays 2d extending rearward from the lug 5 and connected to the rear end of the down tube 2b, an upper portion of the seat tube 2c, and the chain stay 2d. It consists of a pair of left and right seat stays 2e that connect the rear part.
[0003]
A steering handle 6 is attached to the upper end of the front fork 4, and a saddle 8 is attached to the upper end of the seat tube 2 c via a seat pyramid tube 7. A rear wheel blanket 2f for rotatably supporting the rear wheel 9 is integrally provided at the rear end of the chain stay 2d and the lower end of the seat stay 2e.
[0004]
Reference numeral 10 denotes a motor unit 10 serving as auxiliary power for the electric bicycle 1. The motor unit 10 is supplied with power from a battery 20 described later and is controlled by a controller 19, and a gear box 13 having a crankshaft 12. A cranking (not shown), a crank 14 and a pedal 15 that are mounted on the crankshaft 12 are provided. The motor unit 10 is disposed below the down tube along the down tube 2b, and is screwed to the lug 5 and the rear end blanket 16 of the down tube 2b. In the motor unit 10, a chaining located on the right side of the vehicle body is connected to a rear wheel via a chain 17.
[0005]
The motor 11 of the motor unit 10 is connected to a controller 19 through a power supply relay 18 and is supplied with power from the battery 20 through the controller 19. As shown in FIGS. 6 and 7, the motor 11, the relay 18, the controller 19, and the main switch 21 are arranged in a line along the down tube 2b of the frame 2 and arranged at the lower end of the down tube 2b. And supported by the down tube 2b. More specifically, the motor 11 is arranged at the rear of the down tube 2b, and the relay 18, the controller 19, and the main switch 21 are arranged in this order on the front side of the motor 11.
[0006]
The battery 20 is housed in a battery case indicated by reference numeral 38 and mounted on the vehicle body. As this battery 20, 12V is adopted, the battery case 23 is formed in a box shape elongated in the vertical direction, and the battery 20 is disposed between the seat tube 2c and the rear wheel 9 inside.
[0007]
[Problems to be solved by the invention]
However, in the conventional electric bicycle, the controller 19 and the motor unit 10 are attached to the lower portion of the down tube 2b and the lug 5, and a plurality of joint portions 22 for joining the controller 19 and the motor unit 10 are welded to the down tube. must cover secured by a motor unit case 22b, creating a frame for welding a weld 22 one by one, and requires many steps as well. Further, when the down tube 2b is arranged downward, the motor unit 10 cannot obstruct and move downward. Therefore, the position of the down tube becomes high to get on and off, and it is not easy to get on and off. There wasn't.
[0008]
The present invention solves this problem, and an object thereof is to provide an electric bicycle that is easy to get on and off and easy to assemble.
[0009]
[Means for Solving the Problems]
In the frame of the drive bicycle according to the present invention, the motor blanket 35 joined to the drive unit 40 is coupled to the lower end of the seat tube 32c and the lower end of the down tube 32b, and the crankshaft is placed on the extended straight line of the seat tube 32c. Since the seat tube 32c and the down tube 32b are attached to the motor blanket 35 so that the crankshaft is located at the intersection of the extended straight line of the down tube 32b and the extended straight line of the seat tube 32c, a plurality of joints are attached to the down tube 32b. There is no need to weld tools, and the drive unit 40 is not provided on the down tube 32b, so the down tube 32b can be set at a low position.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In the drive bicycle frame of the present invention, the motor blanket 35 joined to the drive unit 40 is coupled to the lower end of the seat tube 32c and the lower end of the down tube 32b, and a crankshaft is provided on the extended straight line of the seat tube 32c. Since the seat tube 32c and the down tube 32b are attached to the motor blanket 35 so that the crankshaft is positioned at the intersection of the extended straight line of the down tube 32b and the extended straight line of the seat tube 32c, the portion to be welded is reduced, and the down tube 32b can be set low.
[0011]
Further, by providing the drive unit 40 below the motor blanket 35 of the frame of the drive bicycle, the arrangement of the down tube 32b can be further lowered.
[0012]
(Embodiment 1)
In one embodiment of the present invention, a drive unit is provided on a part of a frame of an electric bicycle.
[0013]
FIG. 1 is a side view of an electric bicycle according to the present invention, and FIG. 2 is a view with a battery and a cover removed. Reference numeral 31 denotes an electric bicycle, and reference numeral 32 denotes a frame of the electric bicycle 31. The frame 32 includes a head pipe 32a that supports a front fork 34 on which a front wheel 33 is rotatably provided, a down tube 32b that extends rearward and downward from the head pipe 32a, and a motor disposed at the rear of the down tube 32b. A seat tube 32c connected via the blanket 35, a pair of left and right chain stays 32d extending rearward from the motor blanket 35 and connected to the rear end of the down tube 32b, an upper portion of the seat tube 32c, and the chain stay 32d It comprises a pair of left and right seat stays 32e that connect the rear part.
[0014]
A steering handle 36 is attached to the upper end portion of the front fork 34, and a saddle 38 is attached to the upper end portion of the seat tube 32c via a seat pillar tube 37. Further, a rear wheel blanket 32f for rotatably supporting the rear wheel 39 is integrally provided at the rear end portion of the chain stay 32d and the lower end portion of the seat stay 32e. The motor blanket 35 is disposed so that the lower end of the seat pipe 32 c and the lower end of the down tube 32 b are joined, and the drive unit 40 is attached to the motor blanket 35.
[0015]
3 is a view in which the drive unit 40 is attached to the motor blanket 35, FIG. 4 is a view in which the drive unit 40 is removed from the motor blanket 35, and FIG. 5 is a perspective view of the motor blanket 35. Has been.
[0016]
The drive unit 40 serving as auxiliary power of the present invention includes a gear box having a crankshaft for transmitting the rotation of the pedal, a controller for controlling the motor by the force applied to the gear box, and a motor for driving the gear box. . Then, depending on the force of the pedal, the drive unit 40 to drive the rear wheel 39.
[0017]
The motor blanket 35 to which the drive unit 40 is attached by bolts is disposed at a portion where the lower end of the down tube 32b, the lower end of the seat tube 32c, and the chain stay 32e are coupled. The motor blanket 35 is provided with an attachment port 35b on the upper surface portion 35a, and the lower end of the down tube 32b and the lower end of the seat tube 32c are vertically inserted into the attachment port, and the joint portion is fixed by welding. At this time, the joint between the motor blanket 35 and the down tube 32b is located at a lower position than the joint between the motor blanket 35 and the seat tube 32c. Furthermore, it is attached to the motor blanket 35 so that the intersection of the extension straight line of the down tube 32b and the extension straight line of the seat tube 32c is located on the crankshaft. A side surface portion 35b is provided by being bent substantially perpendicular to the upper surface portion 35a. A screw 41 for attaching the drive unit 40 is provided on the side surface portion 35b. A bolt is attached to the side surface of the motor blanket 35 to drive the drive unit. 40 is fixed to the frame 32.
[0018]
Thus, by using the motor blanket 35, it is not necessary to weld a plurality of joints 22 to the down tube 2b as in the conventional case, so that the number of manufacturing steps can be reduced, and the drive unit 40 is further connected to the motor blanket 35. Since the motor blanket 35 can be set at a low position, it is easy to get on and off.
[0019]
In the above, the down tube 32b and the seat tube 32c are attached to the motor blanket 35 so that the intersection of the extension straight line of the down tube 32b and the extension straight line of the seat tube 32c is located on the crankshaft. It is possible to set the down tube 32b further downward so as to extend the down tube 32b from the lower end of the motor blanket 35 so that the front end covers up to the lower end of the drive unit 40, thereby making it easier to get on and off. it can.
[0020]
Further, the motor blanket 35 is shaped so as to cover the drive unit. However, the shape may not be covered, and a bolt hole may be provided in the flat plate.
[0021]
【The invention's effect】
As described above, the present invention can simplify the manufacturing process and facilitate getting on and off.
[Brief description of the drawings]
[Fig. 1] Side view of the drive bicycle of the present invention [Fig. 2] Side view of the drive bicycle with the battery part removed [Fig. 3] Enlarged view of the essential portion [Fig. 4] Enlarged view of the essential portion [Fig. 5] Motor Blanket perspective view [Figure 6] Side view of a conventional drive bicycle [Figure 7] Side view of the main part [Explanation of symbols]
32b Down tube 32c Seat tube 35 Blanket 40 Drive unit

Claims (2)

  A motor blanket (35) joined to the drive unit (40) is a frame of a drive bicycle coupled to a lower end of the seat tube (32c) and a lower end of the down tube (32b), and is an extension of the seat tube (32c) A crankshaft is provided on a straight line, and the seat tube (32c) and the downtube ( 32b) is attached to the motor blanket (35). A drive bicycle having a drive unit (40) joined to a lower portion of the motor blanket (35) according to claim 1.

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