WO2017181666A1

WO2017181666A1 - Integral bicycle frame

Info

Publication number: WO2017181666A1
Application number: PCT/CN2016/106369
Authority: WO
Inventors: 张义杰; 廖张华
Original assignee: 太仓市哲泰天产品设计有限公司
Priority date: 2016-04-22
Filing date: 2016-11-18
Publication date: 2017-10-26
Also published as: CN105857486A; CN105857486B

Abstract

An integral bicycle frame, which comprises a front beam (21), a rear fork (22), a head tube (23), and a seat tube (24), with these parts being integrally formed by means of a stamping or die-casting process. The front beam (21) comprises an upper beam (211) and a lower beam (212). The rear fork (22) comprises a rear upper fork (221) and a rear lower fork (222). The head tube (23) is provided at one extremity of the front beam (21). One extremity of the upper beam (211) and that of the lower beam (212) converge at the head pipe (23). The seat tube (24) is arranged between the front beam (21) and the rear fork (22). The lower beam (212) and the rear lower fork (222) converge at one extremity of the seat tube (24); the upper beam (211) and the rear upper fork (221) converge in proximity to the other extremity of the seat tube (24). The integral bicycle frame not only completely obviates a welding process in the production process, but also ensures that the tubular structure has great lateral impact resistance.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle frame, and more particularly to a welding-free integrated bicycle frame. BACKGROUND OF THE INVENTION Conventional bicycle frames are typically composed of steel or aluminum tubes of different sizes. As shown in FIGS. 1A and 1B, the conventional bicycle frame 1 may include a front tube 11, a pair of rear forks 12, a head tube 13 provided at the front end of the front tube 11 for mounting the handlebar and the front fork, and a front tube 11 for connection. The seat tube 14 and the two intersections of the rear fork 12, wherein the front tube is composed of an upper tube 111 and a lower tube 112, each of the rear forks 12 further includes a rear upper fork 121 and a rear lower fork 122, respectively. These fittings need to be connected end to end to form the entire frame, making the welding process an extremely important part of the bicycle frame production process. Since the welding process itself has the disadvantages of generating chemical dust, polluting the environment, high automation cost, and prone to joint hazards, the solderless bicycle frame or the bicycle frame with less welding demand will become more and more popular.

In order to reduce the need for welding, the patent No. ZL03284253.8 discloses a steel plate stamping bicycle frame, which is formed by stamping a steel plate into a bicycle frame with a front inclined beam and a rear support frame as a whole. The problem of welding is solved, but the front sloping beam and the rear support frame are both plate-shaped, not only the shape is rough and unsightly, but also the lateral impact resistance is far from the shape of the round tube. The utility model patent No. ZL201120365355.2 discloses an integral stamping frame, which combines the left and right parts of the frame to form a complete frame, although the tubular structure of the traditional frame is retained, but the left and right parts are When it is combined, it still needs to be realized by welding, and it cannot effectively eliminate or reduce the influence of welding. Summary of the invention In order to overcome the defects existing in the prior art, the present invention provides an integrated bicycle frame based on a stamping or plining process, which not only completely avoids the splicing process in the production process, but also ensures a good lateral impact resistance of the tubular structure. ability.

An integrated bicycle frame of the present invention includes:

The front beam, the front beam includes an upper beam and a lower beam;

a head tube disposed at one end of the front beam;

a rear fork, the rear fork is a one-sided rear fork including a rear upper fork and a lower rear fork;

a seat tube, a lower beam and a lower fork intersecting one end of the seat tube, and the upper beam and the upper rear fork meet at the other end of the seat tube;

Among them, the front beam, the head tube, the rear fork and the seat tube are integrally formed.

Further, the front beam, the head tube, the rear fork, and the seat tube are integrally formed by a pressing or pressing process.

Further, one end of the rear fork away from the front beam is deflected to one side in a direction perpendicular to the plane of the front beam to ensure that the front and rear wheels of the bicycle are in the same line.

Further, the cross-sectional shape of the front beam, the head tube, the rear fork, and the seat tube is c-shaped.

Further, the opening direction of the C-shape is opposite to the skew direction of the rear fork.

Further, a C-clip is disposed on the head pipe and the seat tube, and the C-clamp and the C-shaped cross-section cooperate to form a circular tubular structure.

Further, the integrated bicycle frame is stamped and formed from a 3- 6 mm thick iron plate.

Further, the integrated bicycle frame is stamped and formed from a 4- 7 mm thick aluminum plate.

Due to the above technical solution, the present invention has the following advantages compared with the prior art:

1. The integrated bicycle frame of the invention is integrally formed by stamping or die-casting process, completely eliminating the splicing process, without environmental pollution, simple process, high degree of automation, effectively reducing production cost and improving work efficiency;

2. The one-side rear fork reduces the overall weight of the frame to a certain extent while ensuring the performance of the traditional frame;

3. The C-shaped cross section is not only beautiful, but also ensures a good lateral impact resistance of the tubular structure;

4. The frame of the invention has strong practicability: the C buckle is arranged to be suitable for general bicycle accessories such as a seat, a handlebar, a front fork, etc.; 5. The uniform material of each part of the frame is uniform, which can effectively avoid the failure of the traditional frame due to stress concentration at the welding point. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a schematic view of a bicycle frame in the prior art; FIG.

Figure IB is a top plan view of a bicycle frame rear fork in the prior art;

Figure 2 is a schematic view of an integrated bicycle frame in accordance with the present invention;

3 is a further schematic view of an integrated bicycle frame in accordance with the present invention.

Description of the reference signs:

1 bicycle frame, 1] front tube, 11 1 upper tube, 112 lower tube, 12 rear fork, 121 upper fork, 122 lower fork, 13 head tube, 14 seat tube, 2 integral bicycle frame, 21 front beam, 2] 1 upper beam, 212 lower beam, 22 rear fork, 221 upper fork, 222 lower fork, 23 head tube, 24 seat tube, 25 C buckle. BEST MODE FOR CARRYING OUT THE INVENTION In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

2 is a schematic view of a bicycle bicycle frame (hereinafter referred to as a frame) 2 in accordance with the present invention. As shown in Fig. 2, the frame 2 generally includes a front beam 21, a rear fork 22, a head pipe 23, and a seat tube 24, and the above portions are formed by a stamping or die casting process. The front beam 21 includes an upper beam 211 and a lower beam 212, and the rear fork 22 includes a rear upper fork 221 and a rear lower fork 222. The head pipe 23 is disposed at one end of the front beam 21, and as shown, one end of the upper beam 211 and the lower beam 212 meet at the head pipe 23. The seat tube 24 is located between the front beam 21 and the rear fork 22, wherein the lower beam 212 and the rear lower fork 222 meet at one end of the seat tube 24, and the upper beam 211 and the rear upper fork 221 meet at the other end of the seat tube 24. Compared with the prior art, the frame 2 of the present invention uses a single-arm rear fork, that is, the rear fork 22 is provided only on one side (left side or right side) of the rear wheel, which not only can reduce the overall frame 2 accordingly. The weight also facilitates the operation of the stamping or die casting process. In order to ensure that the front and rear wheels of the bicycle are in a straight line, the rear fork 22 is deflected away from the side of the front beam 21 toward one side of the wheel (not shown), That is, it is inclined to one side perpendicular to the plane in which the front beam 21 is located. In one embodiment of the invention, the rear fork 22 is offset from the end of the front beam 21 by about 60 mm and 100 mm toward the right side of the wheel. Alternatively, it can also be skewed to the left side of the wheel by an appropriate distance to ensure that the front and rear wheels of the bicycle are in line.

In the present invention, the cross-sectional shape of each portion of the frame 2 is C-shaped, so that it has a good ability to resist side impact. Preferably, the opening direction of the C-shaped cross section may be opposite to the skew direction of the rear fork 22. For example, when the rear fork 22 is deflected toward the right side of the wheel, the cross-sectional shape of each portion of the frame 2 may be a C-shaped opening to the left. In order to increase the practicability, it is convenient to install the seat, the handlebar, the front fork and the like at the corresponding position of the frame 2, and the C-shaped cross-corrugated C-clip can be arranged at the corresponding part. As shown in Fig. 3, a C-clip is provided at the C-section opening of the upper portion of the seat tube 24 and the head tube 23 to have a tubular structure, so that the seat, the handlebar and the front fork of the conventional bicycle can be installed here. In an embodiment of the invention, the C-clip can be secured to the upper portion of the seat tube 24 and the head tube 23 by a mechanical fastening such as splicing or bolting. In order to ensure the overall strength of the frame 2, it is possible to use a metal plate slightly thicker than the wall of the conventional frame. For example, the thickness of the wall of the conventional iron frame is about 1-2 mm, and the thickness of the wall of the aluminum frame is about 2-3 mm. The frame 2 disclosed in the present invention can be made of iron plate or thickness having a thickness of about 3-6 mm. Made of aluminum plate of about 4 to 7 mm. For each part of the frame 2, a semi-circular pipe structure having a C-shaped cross section is adopted, and only one side rear fork 22 is provided, so appropriately increasing the wall thickness of the pipe does not make the overall weight of the frame 2 heavier than the conventional frame. The traditional bicycle frame needs to pass through multiple processes to realize the connection between the parts in different directions, which is difficult to connect and the automation cost is extremely high. In contrast, the frame 2 of the present invention has a single structure and is easy to realize fully automated mass production. Taking the stamping process as an example, the conventional stamping machine can be used to obtain the integrally formed frame 2 by single-direction stamping of the appropriate thickness of the sheet metal, which not only saves time for producing a single product, but also improves productivity. There is no need to use a high-cost automated assembly line, which effectively reduces production costs. The above-mentioned embodiments are merely illustrative of the embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

Claim

An integrated bicycle frame characterized by comprising:

a front beam, the front beam comprising an upper beam and a lower beam;

a head tube disposed at one end of the front beam;

a rear fork, the rear fork being a one-sided rear fork including a rear upper fork and a lower rear fork;

a seat tube, the lower beam and the lower lower fork meet at one end of the seat tube, and the upper beam and the upper rear fork meet at another end of the seat tube;

The front beam, the head tube, the rear fork and the seat tube are integrally formed.

2. The integrated bicycle frame according to claim 1, wherein the front beam, the head tube, the rear fork, and the seat tube are integrally formed by one of stamping or die casting processes.

3. The integrated bicycle frame according to claim 1, wherein one end of the rear fork away from the front beam is deflected to one side in a direction perpendicular to a plane of the front beam to ensure The front and rear wheels of the bicycle are in the same line.

4. The integrated bicycle frame according to claim 3, wherein the front beam, the head tube, the rear fork, and the seat tube have a C-shaped cross section.

5. The integrated bicycle frame according to claim 4, wherein the C-shaped opening direction is opposite to the skew direction of the rear fork.

The integrated bicycle frame according to claim 4, wherein the head pipe and the seat tube are provided with a C buckle, and the C buckle cooperates with the C-shaped cross section to form a circular tubular structure. .

7. The integrated bicycle frame according to claim 1, wherein the integrated bicycle frame is stamped and formed from a 3-6 mm thick iron plate.

8. The integrated bicycle frame according to claim 1, wherein the integrated bicycle frame is stamped and formed from a 4-7 mm thick aluminum plate.