KR101199979B1 - Bicycle frame which used dual tube - Google Patents

Abstract

Bicycle frame using dual tube with dual top tube and down tube is provided. Bicycle frame according to an embodiment of the present invention, the handle and the front of the bicycle head tube head connected; A top unit having one end connected to an upper portion of the head tube; A down unit having one end connected to a lower portion of the head tube; And a seat tube connected to the top unit and the down unit to support the top unit and the down unit, and the saddle of the bicycle is connected, wherein the top unit is formed of a pair of top tubes and a pair of seat stays. It is a tube structure, and the down unit is a dual tube structure formed of a pair of down tubes and a pair of chainstays.

Description

Bicycle frame using dual tube {Bicycle frame which used dual tube}

The present invention relates to a bicycle frame, and more particularly to a bicycle frame using a dual tube consisting of a dual top tube and down tube.

There is a growing interest in bicycles that are convenient and easy to use as recreational means and eco-friendly vehicles. Accordingly, research is being actively conducted to apply new materials to the frame to reduce the weight of the bicycle. However, the bike's structure remains the same as the diamond frame of the 1890s, with no major changes over the last 100 years.

1 illustrates a diamond frame which is a conventional bicycle frame. The conventional diamond frame 100 is composed of a head tube 102, seat tube 104, top tube 106, down tube 108, seat stay 110 and chain stay 112.

Head tube 102 is connected to the steering wheel of the connection is connected to the top, the rotating connector of the front wheel is connected to the bottom. In addition, the seat tube 104 is connected to the connection of the saddle at the top, the connection of the chain is connected to the bottom. The top tube 106 and the down tube 108 are connected to and support the head tube 102 and the seat tube 104. In addition, the seat stay 110 and the chain stay 112 connects and supports the rotary connection of the rear wheel and the seat tube 104.

The diamond frame 100 of the conventional bicycle has the advantage of maintaining a robust structure, but there is a limit to the weight reduction of the frame, when the frame is lightweight, the rigidity of the frame occurs. In addition, the diamond frame has a large number of joints, so that welding defects are likely to occur, the manufacturing process is complicated, and a lot of time and equipment are required.

The present invention is to solve the above problems, it is to provide a bicycle frame is reduced in weight by the dual configuration of the top tube and the down tube, the rigidity of the frame itself.

The problem to be solved by the present invention is to provide a bicycle frame that can reduce the number of joints during the manufacture of the bicycle frame, simplify the bicycle manufacturing process, and prevent defects caused by poor welding.

Another object of the present invention is to provide a bicycle frame to form an empty space in the interior of the frame to provide a storage space.

Problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

Bicycle frame according to an embodiment of the present invention for achieving the above object, the head tube is connected to the handle and the front wheel of the bicycle; A top unit having one end connected to an upper portion of the head tube; A down unit having one end connected to a lower portion of the head tube; And a seat tube connected to the top unit and the down unit to support the top unit and the down unit, and the saddle of the bicycle is connected, wherein the top unit is formed of a pair of top tubes and a pair of seat stays. It is a tube structure, and the down unit is a dual tube structure formed of a pair of down tubes and a pair of chainstays.

Bicycle according to an embodiment of the present invention for achieving the above object, using the bicycle frame.

Other specific details of the invention are included in the detailed description and drawings.

According to the present invention, by configuring the top tube and the down tube in dual, the bicycle frame can be reduced in weight, and the rigidity of the frame itself can be improved.

In addition, when manufacturing the bicycle frame, it is possible to reduce the number of joints to simplify the bicycle manufacturing process to increase the production efficiency, reduce the manufacturing cost, and prevent defects caused by poor welding.

In addition, an empty space may be formed inside the frame to provide a storage space, or an accessory of the bicycle may be mounted to effectively use the bicycle frame.

1 is a view showing a diamond frame of a conventional bicycle.
2 is a view showing a bicycle frame using a dual tube according to an embodiment of the present invention.
3 is a view connecting the connection tube between the dual tube structure according to an embodiment of the present invention.
Figure 4 (a) is a view showing each tube having a fitting hole constituting the bicycle frame, Figure 4 (b) is a view showing a bicycle frame connecting each tube having a fitting hole.
5 is a view showing a bicycle frame using a dual tube having an opening and closing device on one surface of the outer cover portion and the outer cover portion.
FIG. 6 (a) is a diagram showing the front loading conditions of the strength analysis experiment for the diamond bicycle frame, and FIG. 6 (b) is the diagram showing the side loading conditions of the strength analysis experiment for the bicycle frame using the dual tube. .
7 is a diagram illustrating a bicycle having a bicycle frame using a dual tube.

Advantages and features of the present invention, and methods of achieving the same will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Although the first, second, etc. are used to describe various elements, components and / or sections, it is needless to say that these elements, components and / or sections are not limited by these terms. These terms are only used to distinguish one element, element or section from another element, element or section. Therefore, it goes without saying that the first element, the first element or the first section mentioned below may be the second element, the second element or the second section within the technical spirit of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, the terms "comprises" and / or "made of" means that a component, step, operation, and / or element may be embodied in one or more other components, steps, operations, and / And does not exclude the presence or addition thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 is a view showing a bicycle frame using a dual tube according to an embodiment of the present invention.

The bicycle frame 200 includes a head tube 210, a seat tube 220, a top unit 230, and a down unit 240.

The handle and the front wheel of the bicycle is connected to the head tube 210. In addition, the top unit 230 and the down unit 240 is connected to the head tube 210.

The top unit 230 refers to one formed of a pair of top tubes and a pair of seat stays, and the down unit 240 refers to one formed of a pair of down tubes and a pair of chain stays. At this time, the tube of a typical bicycle frame has a straight shape, but the top unit 230 and the down unit 240 has a slope in the middle portion.

Therefore, the top tube 106 and the down tube 108 of the conventional diamond frame 100 is a single tube structure, whereas the bicycle frame 200 using the dual tube of the present invention is a conventional top tube 106 and down The tube 108 has a dual tube structure consisting of a double.

The other end of the top unit 230 and the down unit 240 provided with a dual tube is connected to the rotary connection of the rear wheel.

Therefore, the top unit 230 is a dual structure that performs the role of the conventional single structure head tube 106 and the conventional dual structure seatstay 110 at the same time. In addition, the down unit 240 is a dual structure that performs the role of the conventional single structure down tube 108 and the conventional dual structure chainstay 112 at the same time.

The seat tube 220 is connected to the top unit 230 and the down unit 240 to support the top unit 230 and the down unit 240, the saddle of the bicycle is connected.

The top unit 230 is a support that simultaneously performs the roles of the top tube and the seatstay, but is formed integrally, and is divided into a part that performs the role of the top tube and a part that performs the role of the seatstay. Slope at Similarly, the down unit 240 may also be divided into parts that perform the role of the down tube and the chainstay, and forms a slope in the divided area.

The seat tube 220 is connected to a region where the top unit 230 and the down unit 240 are inclined.

3 is a view connecting the connection tube between the dual tube structure according to an embodiment of the present invention.

The top unit 230 and the down unit 240 have a dual tube structure, and a space is formed between the dual tube structures. At this time, the connecting tube 250 is connected to enhance the rigidity between the dual tube.

That is, as shown in FIG. 3, the connection tube 250 connects between the dual tubes constituting the top unit 230 or the dual tubes constituting the down unit 240, and the top unit 230 and the down unit ( 240) to support the role. Here, the connection tube 250 is at least one, it may be only between the top unit 230 or only between the down unit 240.

Figure 4 (a) is a view showing each tube having a fitting hole constituting the bicycle frame, Figure 4 (b) is a view showing a bicycle frame connecting each tube having a fitting hole.

A top unit 230 having a dual tube structure formed of a pair of top tubes and a pair of seat stays and a down unit 240 having a dual tube structure formed of a pair of down tubes and a pair of chainstays may be employed. At this time, the production of the bicycle frame 200 is simplified.

The fitting hole 235 may be provided between the dual tubes forming the top unit 230, and the fitting hole 245 may be provided between the dual tubes forming the down unit 240. The upper and lower ends of the seat tube 220 are fastened to the fitting holes 235 and 245 to further simplify the manufacturing process of the bicycle frame.

The upper end of the seat tube 220 is fastened to the fitting hole 235 of the top unit 230, and the lower end of the seat tube 220 is fastened to the fitting hole 245 of the down unit 240.

A locking jaw (not shown) may be provided as an inner space of the fitting hole to prevent separation after the upper and lower ends of the seat tube 220 are fastened to the fitting holes 235 and 245.

As shown in Figure 4 (a), the head tube 210 may also be provided with four fitting holes so that the top unit 230 and the down unit 240 can be fastened. At this time, the ends of the top unit 230 and the down unit 240 will have a bent shape to facilitate fastening. In the case of the head tube 210, since the ends of the top unit 230 and the down unit 240 are fastened, since the rigidity is generally weaker than that of the seat tube 220, it is possible to increase the rigidity by additionally performing a welding operation. will be.

As shown in FIG. 4B, the top unit 230 and the down unit 240 are fastened to the fitting hole 215 of the head tube 210, and the fitting hole 235 of the top unit 230 is fastened. Fastening the upper end of the seat tube 220, by fastening the lower end of the seat tube 220 to the fitting hole 245 of the down unit 240 can be easily assembled bicycle frame 200.

Therefore, the fitting holes 235 and 245 are provided in the areas of the top unit 230 and the down unit 240 to which the seat tube 220 is connected, thereby simplifying the manufacturing process of the bicycle frame 200, and the bicycle frame. By effectively dispersing the impact applied to the (200) it is possible to improve the rigidity of the frame.

5 is a view showing a bicycle frame using a dual tube having an opening and closing device on one surface of the outer cover portion and the outer cover portion.

Since the top unit 230 and the down unit 240 each have a dual tube structure, assuming a virtual plane connecting the dual tube structure of the top unit 230 and the down unit 240, the top unit 230 and A virtual internal space formed by the down unit 240 is created.

Therefore, as shown in FIG. 5, when the head tube 210, the top unit 230, the down unit 240, and the seat tube 220 are each covered with a cover, that is, the outer cover part 260, 6 The inner space is formed by the facet.

The material of the outer cover part 260 includes all materials capable of forming a space inside the bicycle frame 200 such as metal, plastic, fiber, and wood.

In addition, when an apparatus for opening and closing the inner space formed by the outer cover part is installed on at least one surface of the outer cover part 260, the inner space may be used as a storage space. For example, the zipper may be provided on at least one surface of the outer cover part 260. In addition, it may be a sliding door type or a sliding door type opening and closing device. Of course, it is obvious that all types of switchgear predictable by those skilled in the art to which the present invention pertains are included in the scope of the present invention.

The outer cover part 260 may store important items or luggage of a bicycle driver through an opening and closing device 265 in an empty space formed therein.

Hereinafter, the strength analysis results of the conventional bicycle frame 200 and the bicycle frame 200 using the dual tube will be described.

FIG. 6 (a) is a diagram showing the front loading conditions of the strength analysis experiment for the diamond bicycle frame, and FIG. 6 (b) is the diagram showing the side loading conditions of the strength analysis experiment for the bicycle frame using the dual tube. .

Table 1 below is a diamond frame setting value of the diamond bicycle frame 100, Table 2 is a dual tube frame setting value of the bicycle frame 200 using a dual tube. Here, since the purpose of strength analysis according to the structure of the frame is the purpose, the analysis on welding of the pipe of the frame, etc. will be omitted.

characteristic value Tube outer diameter

Tube thickness

Section area of pipe

Mass

characteristic value Tube outer diameter

Tube thickness

Section area of pipe

Mass

The two frame models used in the analysis have the same size of the front head tube and the middle sheet tube, and differ only in whether the top tube and the down tube are single tube structure or dual tube structure.

In this analysis, the rear axle was first fixed, a bottom bracket was further fixed, and 220 N was applied to the head tube front. Because the purpose of this analysis is to investigate the strength and stress changes according to the structure, general structural steel was used as the material. The properties of the material are shown in Table 3 below.

characteristic value Young's modulus 2.e + 011 Poisson's ratio 0.3 Tensile yield strength 2.5e + 008Pa Compressive yield strength 2.5e + 008Pa Tensile ultimate strength 4.6e + 008Pa

 As shown in Figs. 6 (a) and 6 (b), the constraints of the two types of frames are set with the rear axle and the bottom bracket as the fixed support, and the load of 220 N is applied to the head tube in front (Fig. 6 ( The dividing was carried out by giving from a)) and giving from the side (Fig. 6 (b)).

When the front and side loads are applied, the maximum stresses for the two types of bicycle frames are shown in Table 4 below.

Diamond frame Dual tube frame Frontal load 23.214 Mpa 22.374 Mpa Side load 104.56 Mpa 76.322 Mpa

When the frontal load was applied, the internal stress of the dual tube frame was reduced by about 3.62% compared to the conventional diamond frame. In addition, when the side load was applied, the internal stress of the dual tube frame was reduced by about 27.01% compared to the conventional diamond frame.

In light of these results, it can be seen that the top tube and the down tube are divided into two parts in the bicycle frame structure, that is, the dual tube frame is effective in reducing the internal stress according to the load. In particular, it can be seen that the frame 200 using the dual tube is composed of the top tube and the down tube in a double, the stiffness to the side load is very excellent.

7 is a diagram illustrating a bicycle having a bicycle frame using a dual tube.

Since the bicycle having the bicycle frame 200 using the dual tube has a smaller internal stress than the diamond frame 100 of the related art, the frame can be lightened as much as the stress is reduced. Of course, a bicycle using a frame predictable by one of ordinary skill in the art to which the present invention pertains belongs to the scope of the present invention.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

200: bicycle frame 210: head tube
220: seat tube 230: top unit
240: down unit 235, 245: fitting hole
250: connecting tube 260: outer cover portion
265: switchgear

Claims (7)

Head tube to which the handle and the front wheel of the bicycle is connected;
A top unit having one end connected to an upper portion of the head tube;
A down unit having one end connected to a lower portion of the head tube; And
It is connected to the top unit and the down unit to support the top unit and the down unit, made of a seat tube is connected to the saddle of the bicycle,
The top unit is a dual tube structure formed of a pair of top tube and a pair of seat stay, the down unit is a dual tube structure formed of a pair of down tube and a pair of chainstay,
The top unit and the down unit has a fitting hole between each of the dual tubes forming the top unit and the down unit, respectively, the both ends of the seat tube is fastened to the respective fitting hole, bicycle frame using a dual tube. The method of claim 1,
And at least one connecting tube connecting between the dual tubes forming the top unit or the dual tubes forming the down unit. delete delete The method of claim 1,
A plurality of outer cover parts are coupled to respective planes formed by the head tube, the top unit, the down unit, and the seat tube to form an empty space therein. 6. The method of claim 5,
Bicycle frame using a dual tube, the opening and closing device is mounted on at least one of the plurality of outer cover. delete

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