Mounted bicycle head tube

Abstract

The present invention discloses a built-in bicycle frame head tube, comprising a head tube (2) and a frame tube (1). The frame tube (1) has an opening at the front end or a slit in the middle, and the upper and lower parts are formed by flanging, stretching, and punching to form a hollowed-out tiger's mouth at the tube head of the frame tube (1). Holes are formed at the upper and lower parts, and the tiger's mouth between the holes is used to insert a battery pack into the frame tube (1). The head tube (2) is inserted into the hole of the frame tube (1), and welding is not required, which is low in cost. The head tube (2) is made of steel tube, which has high mechanical strength and avoids the disadvantage that the aluminum alloy frame without a head tube structure is easily deformed over time. The tiger's mouth at the front end of the head tube (2) and the frame tube (1) realizes a triangular stable force-bearing structure, which is smooth and beautiful.

Description

Technical Field

[0001] The invention relates to a bicycle frame structure, in particular to an embedded bicycle frame head pipe. Background Art

[0002] Bicycles are a green means of transportation. For existing electric bicycles on the market, the battery installation method is mainly a frame external battery structure, and battery theft incidents often occur. With the application of lithium batteries in electric bicycles, the volume and weight of the battery are greatly reduced. Therefore, the battery is loaded into the frame tube from the front of the frame tube, and the frame tube also serves as a battery box, which is low in cost and also plays an anti-theft role. In the prior art, for example, the patent number is ZL2007 1 0022052.9, and the name is electric frame, which discloses an electric bicycle frame without a head tube. The method of welding short circles on the frame tube has high welding costs and large deformation of aluminum alloy after aging. In particular, the two short circles are used to fix the bowl group. After the frame is welded, there is always a welding deformation problem. After aging, a reamer needs to be used to ream holes to ensure the installation accuracy. When the frame is stored for a period of time, the frame continues to deform, resulting in low position accuracy of the upper and lower bowl bearings, affecting the smoothness of the handlebar direction rotation.

[0003] After drilling and flanging the frame tube, the aluminum alloy material at the hole is thin and has low strength, which often leads to the loosening of the bowl assembly after the front fork is hit. The weld bead bulge caused by welding causes complaints from customers and also reduces the product grade. After the bicycle frame is flanging, the tube material is thin and the bearing position is weak, which cannot firmly support the force. Summary of the invention

[0004] The purpose of the present invention is to provide a welding-free fixing method in which a frame tube (1) is a hollow structure and a head tube is inserted from the front end of the frame tube. A drawstring (7) is fixed on the battery pack and is tightly inserted into the cavity of the frame tube (1). The drawstring (7) is sleeved on the head tube (2). The head tube (2) can be removed from the frame tube (1), so as to facilitate the insertion or removal of the battery pack into the cavity of the frame tube (1). Specifically, the front end of the frame tube (1) is open in the middle, and the upper and lower parts include hollowed-out tiger's mouths formed at the front end of the frame tube (1) by flanging, stretching, and punching, and holes are formed at the upper and lower parts, respectively, and the tiger's mouths between the holes are used to insert the battery pack into the frame tube (1). A joint tube (2) is sleeved in the hole, that is, the head tube (2) is inserted into the upper and lower holes of the frame tube (1). The head tube (2) and the frame tube (1) are detachable.

[0005] The solution can achieve the effect of raising the front end of the frame tube (1) up and down to a height higher than the upper and lower width of the frame tube (1) without welding the head tube (2). By utilizing the height of the head tube (2) and the upper and lower width of the frame tube (1), a triangular stable force-bearing structure is formed, thereby reducing the manufacturing cost of the frame and lightening the weight.

[0006] Furthermore, holes are opened at the front end of the frame tube (1). The lower opening of the head tube (2) is larger than the upper opening, and the head tube (2) is inserted into the hole of the frame tube (1) from the bottom to complete the installation. In this way, the head tube (2) can be free from frame welding, avoiding the high cost of manual welding, and is not easy to deform, and has advantages such as high mechanical strength. For the front end of the thin-walled frame tube (1), holes are opened at the upper and lower ends, and riveted rings (10) are provided at the hole openings to enhance the strength of the tube openings and also avoid welding. The head tube (2) is fixedly connected to the frame tube (1) via the riveted ring (10), thereby increasing the strength of the frame.

[0007] Furthermore, the opening at the front end of the frame is flanged to increase the height and strength. The inserted head pipe (2) is a steel pipe. The head pipe (2) and the frame pipe (1) can be made of different materials. For example, the frame pipe is made of a lightweight aluminum alloy or a composite material with good shock absorption performance. The head pipe (2) is made of a high-rigidity steel pipe to ensure dimensional stability, and can also be used as a bearing outer ring, without deformation, with high precision, and can also be used directly as a bearing outer ring.

[0008] A further solution is to install a controller (8) in front of the head tube (2). The power device of the controller (8) is directly mounted on the inner wall of the aluminum alloy frame tube (1), and the frame tube (1) is used as a heat sink and a housing of the controller. Due to the existence of the head tube (2), the battery pack (6) can be fixed on the head tube (2) by a drawstring (7), which effectively prevents the battery pack (6) from moving inside the tube.

[0009] The outer diameter of the middle section of the head tube (2) is smaller than the inner diameter of the frame tube (1), specifically, the lateral outer diameter width of the middle section of the head tube (2) is smaller than the lateral width of the frame tube (1), i.e., in the width direction of the bicycle. In this way, after the head tube (2) is inserted into the frame tube (1), a channel is left on both sides of the head tube (2) for the cables to pass through, thereby avoiding the defect that the front fork riser (3) is exposed at this position, and the rotation of the front fork riser (3) causes the rotating parts to contact with the cables and wear, thereby causing a short circuit fault. The battery can be loaded from the front end of the frame tube (1), which has a better anti-theft effect, shortens the control circuit, improves reliability, and reduces the cost of the battery box.

[0010] There is a pressure cap at the upper end of the front fork riser sleeve, and a screw in the pressure cap (13) is connected to the sunflower nut in the front fork riser (3) for adjusting the gap between the front fork and the bowl assembly (4). The tightening force of the sunflower bolt is transmitted to the upper bowl lower cover (11) of the upper bowl. The downward pressure of the upper bowl lower cover (11) lifts the front fork riser, thereby effectively eliminating the matching gap between the front fork, the head tube (2) and the frame tube (1). The above series of technical measures realize the installation of batteries or other components in the bicycle frame, improve the overall rigidity of the frame, and improve the quality of the bicycle. The head tube (2) and the frame tube (1) are made of different materials. The upper bowl bearing can also adopt a self-lubricating bearing to effectively prevent the handlebar from being too flexible.

[0011] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0012] 1. The front end of the head tube (2) and the frame tube (1) realizes a triangular stable force-bearing structure, which is smooth and beautiful.

[0013] 2. No welding or grinding required, looks smooth.

[0014] 3. Strong anti-theft capability. The head pipe (2) and the frame are interference-fitted and pressed in from below or screwed, which can prevent disassembly by simple hand-held tools and effectively prevent the battery from being stolen.

[0015] 4. The head pipe (2) is made of steel material, which has guaranteed hardness and greatly enhanced dimensional stability compared to aluminum alloy. It can also be used directly as a bearing outer ring, while aluminum alloy cannot. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 1 is a front view of a first embodiment of a built-in bicycle frame head tube of the present invention;

[0017] Attached Figure 2 is a cross-sectional view of a first embodiment of a built-in bicycle frame head tube of the present invention;

[0018] Attached Figure 3 It is a front view of the head pipe of the built-in bicycle frame head pipe of the present invention;

[0019] Attached Figure 4 This is a front view of a second embodiment of a built-in bicycle frame head tube of the present invention;

[0020] Attached Figure 5 This is a diagram of the opening holes of a frame tube of a second embodiment of a built-in bicycle frame head tube of the present invention;

[0021] Attached Figure 6 is a cross-sectional view of a second embodiment of a built-in bicycle frame head tube of the present invention;

[0022] Attached Figure 7 is a top cross-sectional view of a second embodiment of a built-in bicycle frame head tube of the present invention;

[0023] Attached Figure 8 is a cross-sectional view of a third embodiment of a built-in bicycle frame head tube of the present invention;

[0024] Among them: 1. frame tube; 2. head tube; 3. front fork stem; 4. bowl assembly; 5. sleeve; 6. battery pack; 7. drawstring; 8. controller; 9. light board; 10. rivet ring; 11. upper bowl lower cover; 12. upper bowl upper cover; 13. top cover DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0026] Embodiment 1:

[0027] See attached Figure 1-3 As shown, the frame tube (1) is a hollow structure tube material, a slit is opened in the middle of the front section, and the upper and lower processes including flanging, stretching, punching, and trimming are adopted to form a hollowed-out tiger's mouth shape at the front end of the frame tube (1), and holes are formed at the upper and lower ends. The tiger's mouth at the front end is raised up and down, higher than the upper and lower widths of the frame tube (1), so that a triangular stable force-bearing structure is formed by utilizing the height of the head tube (2) and the upper and lower widths of the frame tube (1). The head tube (2) is inserted into the upper and lower holes of the frame tube (1).

[0028] The battery pack is fixed with a drawstring (7) which is sleeved on the head tube (2). The head tube (2) can be removed from the frame tube (1), and objects such as batteries can be inserted into the cavity of the frame tube (1) through the jaws of the user. The drawstring (7) facilitates pulling out the battery pack.

[0029] The head tube (2) is made of a steel tube, the lower opening of which is larger than the upper opening, and is inserted into the hole of the frame tube (1) from the bottom to complete the installation. The frame tube (1) is made of an aluminum alloy tube. There is a pressure cover at the upper end of the sleeve (5) of the front fork riser, and a bolt in the pressure cover (13) is connected to the sunflower nut in the front fork riser (3) to adjust the gap between the front fork and the bowl assembly (4). The tightening force of the sunflower bolt is transmitted to the upper bowl lower cover (11) of the upper bowl. The lower cover (11) of the upper bowl is pressed down to lift the front fork riser, thereby effectively eliminating the matching gap between the front fork, the head tube (2) and the frame tube (1).

[0030] Embodiment 2:

[0031] See attached Figure 4-7 As shown, a built-in bicycle frame head tube adopts upper and lower openings on the front section of the frame tube (1). The lower opening of the head tube (2) is larger than the upper opening, and the head tube (2) is inserted into the hole of the frame tube (1) from the bottom to complete the installation. In this way, the head tube (2) can be free from frame welding, is not easy to deform, and has the advantages of high mechanical strength.

[0032] Furthermore, the opening of the front section of the frame is flanged to increase the height and strength. The inserted head pipe (2) is a steel pipe. The head pipe (2) and the frame pipe (1) can be made of different materials. For example, the frame pipe is made of lightweight aluminum alloy or a composite material with good shock absorption performance. The head pipe (2) is made of a high-rigidity steel pipe to ensure dimensional stability, and can also be used as a bearing outer ring. It does not deform and has high precision, and can be used directly as a bearing outer ring.

[0033] A controller (8) is further installed in front of the head tube (2). The power device of the controller (8) is mounted on the inner wall of the frame tube (1). Due to the existence of the head tube (2), the drawstring (7) for fixing the battery pack (6) is sleeved on the head tube (2), effectively preventing the battery pack (6) from moving inside the tube.

[0034] The outer diameter of the middle section of the head tube (2) is smaller than the inner diameter of the frame tube (1), and specifically, the lateral outer diameter width of the middle section of the head tube (2) is smaller than the lateral width of the frame tube (1). Thus, after the head tube (2) passes through the frame tube (1), channels are left on both sides of the head tube (2) for the cables to pass through.

[0035] Embodiment three:

[0036] See attached Figure 8 As shown, a built-in bicycle frame head tube has upper and lower holes on the front end of a thin-walled frame tube (1), and a riveted ring (10) is connected to the hole mouth to enhance the strength of the tube mouth, and welding is also avoided. The head tube (2) is fixedly connected to the frame tube (1) through the riveted ring (10), thereby increasing the strength of the thin-walled frame.

[0037] In the above three embodiments, threads are arranged at the outer diameter of the head tube (2), and threads are arranged at the upper and lower openings at the front end of the frame tube (1). The middle head tube (2) is threadedly connected to the frame tube (1).

Claims

1. A built-in bicycle head tube, comprising a frame tube and a head tube, characterized in that: The frame tube is a hollow structure tube material, with a slit in the middle of the front section, forming a hollow tiger's mouth shape at the front end of the frame tube, and holes are formed at the top and bottom; A triangular stable force-bearing structure is formed by utilizing the height of the head tube and the upper and lower widths of the frame tube; The head pipe is inserted into the upper and lower holes of the frame pipe and is detachable from the frame pipe.

2. The built-in bicycle head tube according to claim 1, characterized in that: The head pipe is threadedly connected to the frame pipe.

3. The built-in bicycle head tube according to claim 1, characterized in that: The lower pipe opening of the head pipe is larger than the upper pipe opening.

4. The built-in bicycle head tube according to claim 1, characterized in that: The pipe opening of the frame pipe is flanged.

5. The built-in bicycle head tube according to claim 1, characterized in that: The frame pipe opening is riveted with a reinforcement ring.

6. The built-in bicycle head tube according to claim 1, characterized in that: The head pipe is a steel pipe.

7. The built-in bicycle head tube according to claim 1, characterized in that: The head pipe and the frame pipe are made of different materials.

8. The built-in bicycle head tube according to claim 1, characterized in that: The outer diameter of the middle section of the head pipe is smaller than the inner diameter of the frame pipe. After the head pipe penetrates into the frame pipe, a channel is left laterally of the head pipe.

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