JP2001219886A - Frame structure of motor-driven bicycle and motor- driven bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frame structure of a motor-driven bicycle and the motor- driven bicycle capable of reducing a manufacturing cost without impairing excellent traveling performance and facility and capable of efficiently performing assembling work. SOLUTION: In this frame structure of the motor-driven bicycle capable of traveling by imparting auxiliary driving force of an auxiliary driving unit 2 having driving force of manpower and an electric motor 1 and supporting the auxiliary driving unit 2 by a vehicle body via a support bracket, the support bracket for supporting the auxiliary driving unit is divided into a front support bracket 3 and a rear support bracket 4. The auxiliary driving unit 2 is supported by both support brackets 3, 4. Even when the size and the length of the auxiliary driving unit 2 are changed, only either one of the front support bracket 3 and the rear support bracket 4 is changed to cope with a change in the auxiliary driving unit 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric bicycle frame structure.

[0002]

2. Description of the Related Art By adding an auxiliary driving force of an auxiliary driving unit having an electric motor or the like to a manual driving force,
Electric bicycles that can run easily on slopes have already been put into practical use. An electric bicycle of this type is disclosed in
As shown in FIGS. 4 and 5, the main pipe 52, the upright pipe 53, and the chain stay 54 are provided by a single support bracket 51 that supports the auxiliary drive unit 50, as shown in FIGS. 07859 and 11-105768. Are disclosed. According to this frame structure, the auxiliary drive unit 50 can be arranged at a position closer to the lower center of the electric bicycle and has a low center of gravity. Driving performance is improved,
The ease of handling when pushing and walking or on steps is improved.

[0003]

However, in the above-described conventional frame structure, each time the size or length of the auxiliary drive unit 50 is changed, the design of the support bracket 51 for the auxiliary drive unit 50 is changed. The production cost. In addition, when joining the main pipe 52, the vertical pipe 53, the chain stay 54, and the support bracket 51, there is no member serving as a reference point, so that there is a problem that positioning of each member becomes difficult.

The present invention solves the above-mentioned problems, reduces the manufacturing cost without deteriorating good running performance and convenience, and enables a frame structure of an electric bicycle and an electric bicycle capable of efficiently performing an assembling operation. The purpose is to provide bicycles.

[0005]

A frame structure of an electric bicycle according to the present invention which solves the above-mentioned problems is capable of running by adding an auxiliary driving force of an auxiliary driving unit having an electric motor or the like to a driving force by human power. It is a frame structure of an electric bicycle that supports an auxiliary drive unit on a vehicle body via a support bracket, the support bracket supporting the auxiliary drive unit is divided into a front support bracket and a rear support bracket, and both support brackets An auxiliary drive unit is supported.

According to this configuration, even when the size or length of the auxiliary drive unit is changed, it is possible to cope with the change of the auxiliary drive unit by changing only one of the front support bracket and the rear support bracket. In some cases, manufacturing costs can be reduced.

[0007] It is preferable to provide a connecting hanger rack for connecting the main pipe and the vertical pipe, and to connect the connecting hanger rack and the chain stay with a rear support bracket.

According to this configuration, the positioning at the time of joining each member becomes easy by assembling the connecting hanger rack as a reference point at the time of manufacturing and assembling. It is also preferable that a front support bracket is fixed to a joint between the connection hanger rack and the main pipe to reinforce the joint.

According to this structure, the joint between the connecting hanger rack and the main pipe is reinforced by the front support bracket, so that the rigidity of the frame structure is improved.
Bicycles provided with the above frame structure are also included in the gist of the present invention.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, in this electric bicycle, an auxiliary drive unit 2 having an electric motor 1 and the like and generating an auxiliary drive force is connected to two support brackets, a front support bracket 3 and a rear support bracket 4. Via a main pipe 5, a vertical pipe 6, a hanger rack 7, a chain stay 8, and the like. A connecting hanger rack 7 for connecting the main pipe 5 and the standing pipe 6 is provided, and the connecting hanger rack 7 and the left and right chain stays 8 are connected to the rear support bracket 4.
Are connected by The connection hanger rack 7 includes a horizontally extending pipe portion 7a extending short in the lateral direction, an upper extending pipe portion 7b extending short upward, and a forward extending pipe portion 7c extending short forward.

The front support bracket 3 has a structure in which a metal plate is bent into a substantially U-shape in plan view to form a front portion 3a and both side portions 3b. The upper edge of each side surface portion 3b is welded to the rear end of the main pipe 5, the front extending pipe portion 7c of the connection hanger rack 7, and the joint thereof. Has been reinforced. The auxiliary drive unit 2 is supported by a first support bolt 9 and a second support bolt 10 penetrating in a lateral direction through each side surface portion 3b in a posture in which the front side thereof is suspended. The front part 3a of the front support bracket 3 is screwed with a lower half part of the standing pipe 6 and a front part of a protective cover 11 that covers the front support bracket 3, the rear support bracket 4 and the auxiliary drive unit 2.

The rear support bracket 4 is formed by bending a metal plate to form an upper surface portion 4a, both side surface portions 4b, and a rear surface portion 4c. It is welded to the upper pipe portion 7b. Also, each side surface portion 4b of the rear support bracket 4
The front ends of the chain stays 8 are welded to the rear portions, respectively, and both side edges of the rear surface portion 4c of the rear support bracket 4 are connected to the respective side portions of the rear support bracket 4 to which the front ends of the chain stays 8 are welded. 4b is also welded to the rear edge, and the support bracket 4 firmly connects the connecting hanger rack 7 to the left and right chain stays 8 and the left and right chain stays 8 to each other.

A case holding member 13 for detachably supporting a battery case 12 accommodating a small and lightweight battery is mounted on an upper surface 4a of the rear support bracket 4. The battery case 12
The lock can be locked by a cylinder lock 14 attached to the upright pipe 6, and a portion from where the cylinder lock 14 is attached to the auxiliary drive unit 2 is covered with a protective cover 11. The protective cover 11 has a rear portion screwed and locked to a rear end of a guide plate 13 a provided at a rear portion of the case holding member 13.

The rear side of the auxiliary drive unit 2 is supported by a third support bolt 15 penetrating the side surface 4b of the rear support bracket 4 in the lateral direction in a suspended state. Further, the front end of the rear mudguard cover 16 is fixed to the rear surface 4c of the rear support bracket 4 with bolts or the like (not shown).

Further, inside the connecting hanger rack 7, various wirings 1 to the auxiliary driving unit 2 and the battery are provided.
7 is passed. According to the above configuration, since the support bracket for supporting the auxiliary drive unit 2 is divided into the front support bracket 3 and the rear support bracket 4, even if the size or length of the auxiliary drive unit 2 is changed, By changing only one of the front support bracket 3 and the rear support bracket 4, for example, only the shape of the front support bracket 3 and the main pipe 5, it is possible to cope with the change of the auxiliary drive unit 2. The manufacturing cost can be reduced as compared with the case where the design is changed. Further, by providing the case holding member 13 on the upper surface of the rear support bracket 4, the small and lightweight battery can be stably held, and the auxiliary drive unit 2 and the battery are collected at the center of the electric bicycle. Since it can be placed at a low position, running performance is improved and ease of handling when pushing and walking or at a step is improved. And the front support bracket 3
By assembling the auxiliary drive unit 2 to the rear support bracket 4, the assembly itself has a strong frame structure, and a simple, lightweight, and highly rigid frame structure can be provided.

Further, since the connecting hanger rack 7 is interposed between the front supporting bracket 3 and the rear supporting bracket 4, in the process of manufacturing these frame structures, the connecting hanger rack 7 is used as a reference. In addition, it is possible to use a jig and a tool for producing a bicycle frame which have been conventionally used, and it is possible to suppress new investment and the like. In addition, at the time of manufacturing and assembling, by setting the connecting hanger rack 7 as a reference position for the dimensions of the assembling posture, the dimensional accuracy can be increased as compared with a conventional structure in which the reference position is difficult to determine, and high An accurate and high quality frame structure for an electric bicycle can be manufactured. Further, various wirings 17 are provided inside the connection hanger rack 7.
Not only enables orderly code processing, but also prevents the wiring 17 from being damaged.

Also, by connecting the main pipe 5 and the standing pipe 6 by the connecting hanger rack 7, the conventional connecting technique between the main pipe, the standing pipe and the hanger rack in a bicycle can be applied, and a good connection rigidity function can be obtained. In addition to the above, since the joint between the main pipe 5 and the connecting hanger rack 7 is reinforced by the front support bracket 3, the joint strength between these members is further improved.

Further, since the rear support bracket 4 is interposed between the connecting hanger rack 7 and the chain stay 8, it is possible to use the chain stay 8 of a conventional general bicycle and to stabilize the battery. In addition, since the left and right chain stays 8 are connected by the rear support bracket 4, there is no need to separately provide a member for connecting the left and right chain stays 8, and the rear support bracket 4 is formed by bending the rear surface portion 4c. Since both edges of the rear surface portion 4c are welded to the both side surface portions 4b, sufficient strength for connecting the left and right chain stays 8 in the lateral direction and the bonding strength between the chain stay 8 and the rear support bracket 4 can be sufficiently obtained. be able to. Furthermore, since the rear support bracket 4 also serves as a component for attaching the rear mudguard cover 16, the number of components can be reduced as compared with a case where components are separately provided.

Further, since the front support bracket 3 also serves as a fitting for mounting the protective cover 11, the number of parts can be reduced. In the above embodiment, the front support bracket 3 is formed by bending a metal plate, and can be manufactured at low cost by press working. However, the present invention is not limited to this structure. Further, in the above embodiment, the case where the rear support bracket 4 is interposed between the connection hanger rack 7 and the chain stay 8 has been described. However, the present invention is not limited to this, and the connection hanger rack 7 is not limited thereto.
It is also possible to arrange the rear support bracket 4 below these by directly connecting to the chain stay 8 and in this case, the frame structure to which the hanger rack or the chain stay of a general bicycle is connected is slightly modified. Just by doing so, it can be diverted as an electric bicycle frame.

[0020]

As described above, according to the present invention, the support bracket for supporting the auxiliary drive unit is divided into a front support bracket and a rear support bracket, and the auxiliary drive unit is supported by both support brackets. Even when the size or length of the auxiliary drive unit is changed, there is a case where only one of the front support bracket and the rear support bracket can be changed to cope with the change of the auxiliary drive unit, thereby reducing the manufacturing cost. It is possible to do.

Further, a connecting hanger rack for connecting the main pipe and the vertical pipe is provided, and the hanger rack and the chain stay are connected by a rear support bracket, so that the connecting hanger rack is used as a reference point at the time of manufacturing and assembling. Since the components can be assembled, positioning when joining the members becomes easy, and a frame structure for an electric bicycle with high precision and high quality can be manufactured. Storing the wiring cords not only enables orderly code processing, but also prevents damage to the wiring cords. In addition, the rear support bracket can stably support the battery, and can also serve as a member for connecting the left and right chain stays, thereby reducing the number of components.

Further, since the front support bracket is fixed to the joint between the connecting hanger rack and the main pipe and reinforced, the joint between the connecting hanger rack and the main pipe is reinforced by the front supporting bracket. The rigidity of the frame structure is improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a frame structure of an electric bicycle according to an embodiment of the present invention.

FIG. 2 is a perspective view of the frame structure of the electric bicycle viewed from the front upper side.

FIG. 3 is a perspective view of the frame structure of the electric bicycle as viewed from the rear upper side.

FIG. 4 is a side view of a conventional electric bicycle.

FIG. 5 is a side view of a main part of the conventional electric bicycle.

[Explanation of symbols]

 2 Auxiliary drive unit 3 Front support bracket 4 Rear support bracket 5 Main pipe 6 Vertical pipe 7 Hanger rack 8 Chain stay 11 Protective cover 12 Battery case 13 Case holding member

Claims (4)

[Claims] 1. A frame structure of an electric bicycle in which an auxiliary driving unit having an electric motor and the like can be driven by adding an auxiliary driving force having an electric motor or the like to a driving force by human power, and the auxiliary driving unit is supported on a vehicle body via a support bracket. A frame structure for an electric bicycle in which a support bracket for supporting an auxiliary drive unit is divided into a front support bracket and a rear support bracket, and the auxiliary drive unit is supported by both support brackets. 2. A frame structure for an electric bicycle according to claim 1, wherein a connecting hanger rack for connecting the main pipe and the standing pipe is provided, and the connecting hanger rack and the chain stay are connected by a rear support bracket. 3. The electric bicycle frame structure according to claim 1, wherein a front support bracket is fixed to a joint between the connection hanger rack and the main pipe and reinforced. 4. An electric bicycle comprising the frame structure according to claim 1.