JP3150546U - Bicycle electric drive - Google Patents

Abstract

Provided is a bicycle electric drive device having practicality and inventive steps in which parts are simplified, material, manufacturing cost and assembly time are greatly reduced, the center of gravity is more stable, and safety is improved. A bicycle electric drive device A is provided on a bicycle frame so as to drive a front sprocket 12 of the bicycle. The bicycle electric drive device A includes a drive wheel 20, a connection unit 30, a drive motor 40, and a battery set. The drive wheel 20 has a sprocket drive portion 21 around it, and the sprocket drive portion 21 meshes with the front sprocket 12 of the bicycle. The connection unit 30 transmits the drive shaft 41 of the drive motor 40 to the wheel shaft 22 of the drive wheel 20. [Selection] Figure 2

Description

  The present invention relates to a bicycle electric drive device, and more particularly to a bicycle electric drive device for driving a front sprocket of a bicycle.

  Bicycles have become a popular product and are attracting a great deal of attention as the world's oil prices soar and prices are rising, and environmental protection and leisure activities are important to realize an energy-saving and low-carbon society. Yes.

  In addition to demanding weight reduction, maneuverability, shifting function, folding and folding, safety, etc., the structure of the bicycle is also widely demanded for an electric drive function. Also, even those who originally had automobiles and motorcycles now use more people instead of bicycles. Bicycle users are comfortable when driving on a flat or downhill, but when driving uphill, especially for commuters who are tired from a day's work, they feel stressed and painful. This is one of the reasons why electric-powered vehicles were born.

  Conventional bicycle electric drive devices are installed on the rear axle of the bicycle, and such a structural form has many parts, many parts, high material and manufacturing costs, long assembly time, etc. There were drawbacks.

  Also, when the rear wheel axle in the conventional bicycle electric drive device is separated from the center of gravity position of the entire bicycle (biased toward the rear), the bicycle's center of gravity is biased due to the weight of the electric drive device, and the bicycle cannot be stabilized. There was a problem that there was a sense of incongruity and had a negative impact on safety.

  Therefore, developing a more ideal and practical original structure for the problems that exist in the conventional bicycle electric drive structure is the goal and direction that related companies should work on and break through. But there is.

  In view of this, the inventor has many years of experience in the manufacture, development and design of related products, and after designing in detail and carefully evaluating the above goals, we finally completed a practical invention. did.

  An object of the present invention is to provide a bicycle electric drive device that solves the aforementioned problems.

The bicycle electric drive device of the present invention is a bicycle electric drive device provided on the frame 11 of the bicycle 10 so as to drive the front sprocket 12 of the bicycle 10.
It has a drive wheel 20, a connecting unit 30, a drive motor 40, and a battery set 50,
The drive wheel 20 has a sprocket drive portion 21 around it, and the sprocket drive portion 21 meshes with the front sprocket 12 of the bicycle 10,
The connection unit 30 is configured to connect the wheel shaft 22 of the drive wheel 20 and the drive shaft 41 of the drive motor 40 so as to be able to transmit rotation.

The bicycle electric drive device according to the present invention has the following effects.
<1> By engaging and driving the sprocket drive part around the drive wheel directly with the front sprocket of the bicycle, the parts are simplified, and the material, manufacturing cost and assembly time are greatly reduced. There are favorable economic benefits.
<2> By providing the bicycle electric drive device on the front sprocket of the bicycle frame, it matches the position of the center of gravity of the bicycle, and at the same time lowers the center of gravity, improving the stability and safety during running, and the inventive step There is.

It is a figure which shows the bicycle which provided the bicycle electric drive device which becomes Example 1 of this invention. It is a perspective view of the bicycle electric drive device which becomes Example 1 of this invention. FIG. 3 is a diagram showing meshing between a drive wheel and a front sprocket in FIG. 2. It is a figure which shows the modification of a driving wheel. It is a figure which shows the bicycle electric drive device which becomes Example 2 of this invention. It is a figure which shows the operation state of the bicycle electric drive device shown in FIG.

  Hereinafter, embodiments of the present invention will be described. The following embodiments are for illustrative purposes only, and the bicycle electric drive according to the present invention is not limited to these structures.

  FIG. 1 shows a bicycle electric drive device A according to Embodiment 1 of the present invention. The bicycle electric drive device A is provided on the frame 11 of the bicycle 10 and drives the front sprocket 12 of the bicycle 10.

  As shown in FIG. 2, the bicycle electric drive device A includes a drive wheel 20, a connecting unit 30, a drive motor 40, and a battery set 50 that supplies power to the drive motor 40.

  As shown in FIG. 3, a sprocket drive unit 21 is provided around the drive wheel 20. The sprocket drive unit 21 is directly meshed with the front sprocket 12 of the bicycle 10, and the front sprocket 12 is driven.

  In the connection unit 30, the drive shaft 41 of the drive motor 40 and the wheel shaft 22 of the drive wheel 20 are connected, and the rotation of the drive shaft 41 of the drive motor 40 is transmitted to the wheel shaft 22 of the drive wheel 20.

  The sprocket drive unit 21 has a ring shape and is a chain 213 fixed around the drive wheel 20 and meshes with the tooth profile of the front sprocket 12.

  FIG. 4 shows another sprocket drive unit 21A. The sprocket drive unit 21A has a configuration in which a plurality of rollers 215 are arranged around the drive wheel 20 at intervals in the circumferential direction. The size of the roller 215 and the gap between the adjacent rollers 215 are matched with the tooth profile of the front sprocket 12, and the roller 215 meshes with the front sprocket 12.

  As shown in FIG. 2, the axial direction of the drive motor 40 and the axial direction of the drive wheel 20 are orthogonal to each other. The axial direction of the drive shaft 41 of the drive motor 40 is vertical, and is perpendicular to the lower position on one side of the wheel shaft 22 of the drive wheel 20. The connecting unit 30 is an umbrella gear mechanism applied to the steering unit. The umbrella-shaped gear mechanism is composed of a first umbrella-shaped gear 31 and a second umbrella-shaped gear 32 that are arranged orthogonally, and thereby the drive motor 40 and the drive wheel 20 are connected to each other.

  Next, the operation of the bicycle electric drive apparatus A configured as described above will be described.

  The bicycle electric drive A directly drives the front sprocket 12 of the bicycle 10.

  When the bicycle user selects the electric drive mode, the drive shaft 41 of the drive motor 40 rotates, and the drive wheels 20 are moved by the steering drive of the first umbrella gear 31 and the second umbrella gear 32. Further, the front sprocket 12 of the bicycle 10 is rotated.

  The front sprocket 12 is driven to rotate the rear sprocket 14 of the bicycle 10 through the chain 13, and the rear wheel 15 of the bicycle 10 is rotationally driven to achieve an electric drive state.

  FIG. 5 shows a bicycle electric drive B according to the second embodiment of the present invention.

  The drive motor 40 and the drive wheel 20 are provided in alignment with the same axis.

  The wheel shaft 22 of the drive wheel 20 faces the end of the drive shaft 41 of the drive motor 40 and is freely rotatable.

  The connecting unit 30 </ b> B is provided on a screw thread portion 33 formed on the drive shaft 41 of the drive motor 40, a clutch brake disk 34 secured to the outer periphery of the screw thread part 33 with a screw, and an end surface of the clutch brake disk 34. Drive unit 35, a passive unit 36 provided on the end face of the drive wheel 20 so as to face the drive unit 35, and a flexible reset unit 37 provided between the opposing clutch brake board 34 and the drive wheel 20. And the rotation of the drive motor 40 is transmitted to the drive wheels 20. The rotationally transmittable drive unit 35 and the passive unit 36 have tooth tips that match each other. The flexible reset unit 37 is a helical spring.

  When the bicycle user sets the driving mode by stepping, the connecting unit 30B is in the state shown in FIG. The drive shaft 41 of the drive motor 40 does not generate a drive force, and the drive wheel 20 is driven and rotated by the front sprocket 12 of the bicycle 10. The clutch brake board 34 stopped by the thread portion 33 is supported by the flexible reset unit 37 and is separated from the drive wheel 20 and is in an open state. For this reason, the drive mode by stepping on the bicycle 10 is performed without the drive motor 40 being a load.

  When the bicycle user sets the electric drive mode, the connecting unit 30B is in the state shown in FIG. When the drive motor 40 is driven and the drive shaft 41 rotates, a helical movement of the thread portion 33 is generated, the clutch brake board 34 is driven, and the drive part 35 of the clutch brake board 34 is the passive part 36 of the drive wheel 20. And the drive wheel 20 is rotationally driven.

  The front sprocket 12 of the bicycle 10 is rotationally driven by the rotational driving of the driving wheel 20, and the rear sprocket 14 of the bicycle 10 is rotationally driven through the chain 13, and the rear wheel 15 of the bicycle 10 is rotationally driven.

  The bicycle electric drive devices A and B of the above embodiments have the following effects.

  <1> Bicycle electric drive devices A and B are configured to directly engage and drive the sprocket drive part around the drive wheel to the front sprocket of the bicycle, thus simplifying the parts, material, manufacturing cost and assembly It has a favorable economic benefit in industry that time is greatly reduced.

  <2> Since the bicycle electric drive devices A and B are provided on the front sprocket of the bicycle frame, the bicycle electric drive devices A and B are arranged in accordance with the position of the center of gravity of the bicycle, and the center of gravity of the bicycle is lowered. , It has practicality and inventive step that improve stability and safety during running.

  The above-described embodiments are specific descriptions of the present invention, and are described using specific technical terms in the text, but do not limit the scope of the present invention. Those skilled in the art can make changes or improvements to the present invention. However, such changes or improvements are all within the scope of the claims of the utility model registration of the present application without departing from the spirit and principle of the present invention. Is included.

A, B Bicycle electric drive device 10 Bicycle 11 Frame 12 Front sprocket 13 Chain 14 Rear sprocket 15 Rear wheel 20 Drive wheel 21 Sprocket drive unit 213 Chain 215 Roller 22 Wheel shaft 30, 30B Connection unit 31 First umbrella gear 32 Second umbrella Shape gear 33 Threaded portion 34 Clutch brake panel 35 Drive portion 36 Passive portion 37 Flexible reset unit 40 Drive motor 41 Drive shaft 50 Battery set

Claims (5)

A bicycle electric drive device (A) provided to drive a front sprocket (12) of a bicycle (10) on a frame (11) of the bicycle (10),
A drive wheel (20) having a sprocket drive part (21) around the sprocket drive part (21) meshing with a front sprocket (12) of the bicycle (10);
A drive motor (40);
A battery set (50) for supplying power to the drive motor (40);
A bicycle electric drive device having a connection and a unit (30) for transmitting the rotation of the drive shaft (41) of the drive motor (40) to the wheel shaft (22) of the drive wheel (20).   The bicycle electric drive device according to claim 1, wherein the sprocket drive part (21) is a chain (213) which is annular and fixed around the drive wheel (20). In the sprocket drive unit (21), a plurality of rollers (215) are arranged around the drive wheel (20) at intervals in the circumferential direction according to the tooth profile of the front sprocket (12) of the bicycle 10. It is a configuration provided in
The bicycle electric drive according to claim 1, wherein the roller (215) meshes with the front sprocket (12). In the drive motor (40), the axial direction of the drive shaft (41) is vertical and is perpendicular to the lower position on one side of the wheel shaft (22) of the drive wheel (20),
The connection unit (30) includes a first umbrella gear (31) and a second umbrella gear (32) arranged orthogonally, and a space between the drive motor (40) and the drive wheel (20). The bicycle electric drive device according to claim 1, wherein the bicycle electric drive device is connected so as to be able to transmit rotation. The drive motor (40) and the drive wheel (20) are arranged on the same axis,
The wheel shaft (22) of the drive wheel (20) faces the end of the drive shaft (41) of the drive motor (40) and is freely rotatable,
The connecting unit (30B) includes a screw thread portion (33) formed on the drive shaft (41) of the drive motor (40), and a clutch secured to the outer periphery of the screw thread portion (33) with screws. The brake board (34), the drive part (35) provided on the end face of the clutch brake board (34), and the end face of the drive wheel (20) are provided facing the drive part (35). And a passive portion (36) meshing with the drive portion (35), and a flexible reset unit (37) provided between the opposed clutch brake disc (34) and the drive wheel (20). The bicycle electric drive device according to claim 1, wherein the bicycle electric drive device is a bicycle electric drive device.

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