JP2000062679A - Driving bicycle frame and driving bicycle - Google Patents

Abstract

(57) [Problem] To provide an electric bicycle which is easy to get on and off, and which is easy to assemble. A driving bicycle frame in which a motor blanket joined to a driving unit is connected to a lower end of a seat pipe and a lower end of a down tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive bicycle frame and a drive bicycle.

[0002]

2. Description of the Related Art Conventionally, an electric bicycle has been disclosed in Japanese Patent Laid-Open No. 6-2274.
The one described in No. 74 is known. FIG. 6 shows a side view of the conventional example, and FIG. 7 shows a main part of the conventional example. Reference numeral 1 is an electric bicycle, and 2 is a frame of the electric bicycle 1. The frame 2 includes a head pipe 2a for rotatably supporting a front fork 4 having front wheels 3 rotatably provided,
A down tube 2b extending rearward and downward from the head pipe 2a, and a lug 5 on the rear portion of the down tube 2b.
The seat tube 2c connected via the lug 5
And a pair of left and right chain stays 2d connected to the rear end of the down tube 2b and a pair of left and right seat stays 2e connecting the upper portion of the seat tube 2c and the rear portion of the chain stay 2d. ing.

A steering handle 6 is attached to an upper end portion of the front fork 4, and a saddle 8 is attached to an upper end portion of the seat tube 2c via a seat pillar tube 7. Further, at the rear end of the chain stay 2d and the lower end of the seat stay 2e,
Rear wheel blanket 2 for rotatably supporting the rear wheel 9
f is integrally provided.

Reference numeral 10 denotes a motor unit 10 which serves as auxiliary power for the electric bicycle 1. The motor unit 10 is supplied with power from a battery 20 described later and is also controlled by a controller 19 and a crankshaft 12.
And a chainring (not shown) mounted on the crankshaft 12, a crank 14 and a pedal 15. And this motor unit 1
0 is arranged 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 addition,
In this motor unit 10, a chain ring located on the right side of the vehicle body is connected to a rear wheel via a chain 17.

The motor 11 of the motor unit 10
Is connected to a controller 19 via a power supply relay 18, and the battery 2 is connected via this controller 19.
The structure is such that power is supplied from 0. The motor 11,
As shown in FIGS. 1 and 2, the relay 18, the controller 19, and the main switch 21 are arranged in a row along the down tube 2b of the frame 2 in the front-rear direction, and are arranged at the lower ends of the down tubes 2b. It is supported by 2b. More specifically, the motor 1 is arranged at the rear part of the down tube 2b.
The relay 18 controller 19 and the main switch 21 are sequentially arranged on the front side of the.

The battery 20 is housed in a battery case indicated by reference numeral 38 and mounted on the vehicle body. As the battery 20, 12v is adopted, the battery case 23 is formed in a vertically long and slender box shape, and the battery 20 is arranged inside between the seat tube 2c and the rear wheel 9.

[0007]

However, in the conventional electric bicycle, the controller 19 and the motor unit 1 are used.
0 is attached to the lower part of the down tube 2b and the lug 5, the controller 19, the motor unit 10
It is necessary to weld a plurality of joints 22 for joining the two to the down tube and further cover and fix them with the motor unit case 22b, which requires a lot of steps to create the frame and weld the welds 22 one by one. . Further, when the disposition of the down tube 2b is made to be downward, the motor unit 10 interferes and cannot move downward, so that the position of the down tube becomes high when getting on and off, and it is not easy to get on and off. It was

The present invention solves this problem, and an object of the present invention is to provide an electric bicycle that is easy to get on and off and is easy to assemble.

[0009]

In the frame of the driving bicycle of the present invention, the motor blanket joined to the driving unit is connected to the lower end of the seat pipe and the lower end of the down tube, so that the down tube is welded with a plurality of joints. Since the drive unit is not provided on the down tube, it is possible to set the down tube at a low position.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the frame of the driving bicycle of the present invention, the motor blanket joined to the driving unit is connected to the lower end of the seat pipe and the lower end of the down tube, so that the welded portion is reduced and the down tube is lowered. Can be set. Further, the position of the down tube can be made lower by arranging the joint between the motor blanket and the down tube below the joint between the motor blanket and the sheet pipe.

Further, by disposing the driving unit under the motor blanket of the frame of the driving bicycle, the down tube can be arranged at a lower position. (Embodiment 1) In one embodiment of the present invention, a drive unit is provided in a part of a frame of an electric bicycle.

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 is an electric bicycle, and 32 is a frame of the electric bicycle 31. The frame 32 includes a head pipe 32a for rotatably supporting a front fork 34 having front wheels 33 rotatably supported, a down tube 32b extending rearward and downward from the head pipe 32a, and a motor at a rear portion of the down tube 32b. A seat tube 32c connected via a bracket 35, a pair of left and right chain stays 32d extending rearward from the motor bracket 35 and connected to a rear end of the down tube 32b, an upper portion of the seat tube 32c and the chain stay 32c.
It is composed of a pair of left and right seat stays 32e and the like that connect the rear part of d.

A steering handle 36 is attached to the upper end of the front fork 34, and a saddle 38 is attached to the upper end of the seat tube 32c via a seat pillar tube 37. A rear wheel blanket 32f for rotatably supporting the rear wheel 39 is integrally provided at the rear end of the chain stay 32d and the lower end of the seat stay 32e. And
The motor blanket 35 is arranged so that the lower end of the sheet pipe 32c and the lower end of the down tube 32b are joined, and the drive unit 40 is attached to the motor blanket 35.

FIG. 3 shows the drive unit 40 attached to the motor blanket 35, FIG. 4 shows the drive unit 40 removed from the motor blanket 35, and FIG. 5 shows the motor blanket. A perspective view of 35 is shown. The drive unit 40 serving as auxiliary power of the present invention includes a gearbox having a crankshaft that transmits rotation of a pedal, a controller that controls a motor by a force related to the gearbox, and a motor that drives the gearbox. . Then, the drive unit 40 drives the rear wheel 39 by the force applied to the pedal.

The motor blanket 35 to which the drive unit 40 is attached by bolts is a down tube 32.
The lower end of b, the lower end of the seat tube 32c, and the chain stay 32e can be arranged at a portion where they are connected. The motor blanket 35 has a mounting opening 35b on the upper surface 35a.
The lower end of the down tube 32b and the lower end of the seat tube 32c are vertically inserted into the mounting port, and the joint is welded and fixed. At this time, the joint between the motor blanket 35 and the down tube 32b is at a lower position than the joint between the motor blanket 35 and the seat tube 32c. Further, it is attached to the motor blanket 35 so that the intersection of the extension line of the down tube 32b and the extension line of the seat tube 32c is located on the crankshaft. The side surface portion 3 is formed by bending the upper surface portion 35a substantially vertically.
5b is provided, and the drive unit 40 is provided on the side surface portion 35b.
A screw 41 for mounting the drive unit 40 is attached to the side surface of the motor blanket 35 by bolts.
Are fixed to the frame 32.

As described above, by using the motor blanket 35, since it is not necessary to weld the plurality of joints 22 to the down tube 2b as in the conventional case, the number of manufacturing steps can be reduced, and the drive unit 40 can be further reduced. Since the motor blanket 35 is provided under the motor blanket 35, the motor blanket 35 can be set at a low position, which facilitates getting on and off.

The above is the down tube 32b.
The down tube 32b and the seat tube 32c are attached to the motor blanket 35 so that the intersection of the extension line of the above and the extension line of the seat tube 32c is located on the crankshaft. The down tube 35b can be set to a lower position by extending the down tube 32b from the lower end of the motor blanket 35 so as to cover up to and down to further facilitate getting on and off.

Further, although the shape of the motor blanket is formed so as to cover the drive unit, the shape may not be such that the drive unit is covered, but the flat plate may be provided with bolt holes.

[0019]

As described above, the present invention can simplify the manufacturing process and facilitate getting on and off.

[Brief description of drawings]

FIG. 1 is a side view of a driving bicycle according to the present invention.

FIG. 2 is a side view of the driving bicycle with the battery part removed.

[Fig. 3] Enlarged view of the main part

FIG. 4 is an enlarged view of the same main part.

FIG. 5 is a perspective view of a motor blanket.

FIG. 6 is a side view of a conventional drive bicycle.

FIG. 7 is a side view of the main part.

[Explanation of symbols]

32b down tube 32c seat tube 35 blanket 40 drive unit

Claims (3)

[Claims] 1. A frame of a driving bicycle, wherein a motor blanket joined to a driving unit is connected to a lower end of a seat pipe and a lower end of a down tube. 2. The frame for a drive bicycle according to claim 1, wherein the joint between the motor blanket and the down tube is located below the joint between the motor blanket and the seat pipe. 3. A drive bicycle in which a drive unit is joined to the lower part of the motor blanket according to claim 1 or 2.