Head tube inclined tube assembly and vehicle

Abstract

The utility model discloses a head pipe inclined pipe assembly and a vehicle, the head pipe inclined pipe assembly comprises an inclined pipe and a head pipe which are welded, a welding bead between the inclined pipe and the head pipe comprises a transverse section, the transverse section extends along the butt joint direction of the inclined pipe and the head pipe, a stress concentration point is arranged at the joint of the inclined pipe and the head pipe, and the transverse section extends along the butt joint direction of the inclined pipe and the head pipe. And the welding bead and the stress concentration point are arranged in a non-overlapping manner. According to the head pipe and inclined pipe assembly, the strength of a connecting structure between the head pipe and the inclined pipe can be improved, the situation that the head pipe and the inclined pipe are prone to cracking in the driving process is avoided, and the driving safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and particularly to a head tube and inclined tube assembly and a vehicle. Background Art

[0002] For scooters, bicycles and other scooters, the head tube and the inclined tube are mostly connected and fixed by welding. However, in the prior art, a fatal stress concentration point will be formed at the angle connection of the head tube and the inclined tube. During the riding process of the scooter, due to the force applied by the front wheel to the head tube, the welding at this stress concentration point is likely to crack, resulting in a low connection strength between the head tube and the inclined tube, and also reducing the riding safety of the scooter. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related art to some extent.

[0004] To this end, an embodiment of the utility model provides a head tube and inclined tube assembly, which can improve the connection structure strength between the head tube and the inclined tube, avoid the easy cracking of the head tube and the inclined tube during driving, and ensure the driving safety.

[0005] An embodiment of the utility model also provides a vehicle including the above head tube and inclined tube assembly.

[0006] The head tube and inclined tube assembly of the embodiment of the utility model includes a welded inclined tube and a head tube. The weld bead between the inclined tube and the head tube includes a transverse section, and the transverse section extends along the butt joint direction of the inclined tube and the head tube. There is a stress concentration point at the connection of the inclined tube and the head tube, and the weld bead and the stress concentration point are arranged non-coincidentally.

[0007] In some embodiments, a weld groove is provided at the connection of the inclined tube and the head tube, the weld groove extends along the butt joint direction, and the transverse section is arranged in the weld groove.

[0008] In some embodiments, there are two weld grooves, and the two weld grooves are arranged opposite to each other in the horizontal direction orthogonal to the butt joint direction. The weld bead includes two transverse sections, and the two transverse sections are respectively arranged in the two weld grooves.

[0009] In some embodiments, the weld bead extends along the circumferential direction of the connection of the inclined tube and the head tube, and the two transverse sections are respectively arranged at the two ends of the weld bead.

[0010] In some embodiments, the stress concentration point is formed at the bottom of the connection of the inclined tube and the head tube, and the weld bead is located above the stress concentration point and arranged at an interval from the stress concentration point.

[0011] In some embodiments, the inclined tube is provided with a plug-in portion, the head tube is provided with an opening communicating with the inner hole of the head tube, and the plug-in portion passes through the opening and is plug-fitted into the inner hole of the head tube.

[0012] In some embodiments, the plug-in portion is provided with a first hook portion, the opening is provided with a second hook portion, and the first hook portion and the second hook portion are hooked and matched.

[0013] In some embodiments, both the first hook portion and the second hook portion are provided at the bottom of the connection between the inclined tube and the head tube.

[0014] In some embodiments, the plug-in portion abuts against the inner tube wall of the head tube in the docking direction;

[0015] And / or, the plug-in portion is welded to the head tube, and a welding hole for welding is provided on the tube wall of the head tube.

[0016] The vehicle according to the embodiment of the present invention includes the head tube and inclined tube assembly as described in any one of the above embodiments.

[0017] Beneficial effects: The head tube and inclined tube assembly and the vehicle according to the embodiment of the present invention can improve the connection structure strength between the head tube and the inclined tube, avoid the situation that the head tube and the inclined tube are prone to cracking during driving, and ensure the driving safety. Description of the Drawings

[0018] Figure 1 is the overall structural schematic diagram of the head tube and inclined tube assembly according to the embodiment of the present invention.

[0019] Figure 2 is the schematic diagram of the welding groove at the connection between the inclined tube and the head tube according to the embodiment of the present invention Figure 1 .

[0020] Figure 3 is the schematic diagram of the welding groove at the connection between the inclined tube and the head tube according to the embodiment of the present invention Figure 2 .

[0021] Figure 4 is the exploded schematic diagram of the head tube and inclined tube assembly according to the embodiment of the present invention.

[0022] Figure 5 is the longitudinal sectional schematic diagram of the head tube and inclined tube assembly according to the embodiment of the present invention.

[0023] Figure 6 is the schematic diagram of the vehicle according to the embodiment of the present invention.

[0024] Reference Signs:

[0025] 100 - Head tube and inclined tube assembly;

[0026] 1 - Diagonal tube; 11 - Insertion part; 12 - First hook part;

[0027] 2 - Head tube; 21 - Inner hole; 22 - Opening; 23 - Second hook part; 24 - Welding hole;

[0028] 3 - Weld bead; 31 - Horizontal section;

[0029] 4 - Stress concentration point;

[0030] 5 - Weld groove. Specific implementation mode

[0031] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0032] The present utility model is made based on the inventor's discovery and understanding of the following facts and problems:

[0033] Most of the structures of current scooters adopt the method of processing the arc surface of the imitation head tube on the diagonal tube, and then directly welding the diagonal tube and the head tube together to achieve fixation. Although this scheme has a simple structure, its strength cannot meet the operating conditions of shared scooters, etc., and cracks often occur at the welding joint between the frame and the head tube.

[0034] Secondly, there are also some uncontrollable factors in the manufacturing process of the above connection structure. First, the high temperature during the welding process of metal materials will cause the original material properties of the metal materials to be damaged, affecting their strength. Second, the welding tooling during production cannot guarantee the gap between the workpieces during splicing and welding one hundred percent, and the size of the gap will also affect the strength effect of the weld bead after welding.

[0035] Based on the above situation, the present application proposes a head tube diagonal tube assembly.

[0036] As Figure 1 shown, the head tube diagonal tube assembly 100 of the embodiment of the present utility model includes a welded diagonal tube 1 and a head tube 2. The weld bead 3 between the diagonal tube 1 and the head tube 2 includes a horizontal section 31, and the horizontal section 31 extends along the butt joint direction of the diagonal tube 1 and the head tube 2.

[0037] For example, the diagonal tube 1 can be pre - installed with the head tube 2 by insertion. As Figure 1 shown, the diagonal tube 1 is generally arranged obliquely along the direction from the front upper to the rear lower, and the head tube 2 can generally be arranged obliquely along the direction from the rear upper to the front lower. The front upper end of the diagonal tube 1 can be inserted into the head tube 2, and a step or other structures can be provided on the outer peripheral side of the diagonal tube 1, and the outer surface of the head tube 2 can be fitted with the step on the diagonal tube 1.

[0038] During welding, welding materials such as welding rods can be filled into the gap at the connection between the inclined tube 1 and the head tube 2, and then the inclined tube 1 and the head tube 2 can be directly welded and fixed by welding. It should be noted that the above-mentioned weld bead 3 is the single-pass weld formed by deposition during the welding process. The weld bead 3 can generally extend along the circumferential direction of the inclined tube 1, thus fully ensuring the connection structure strength at each butt joint position between the inclined tube 1 and the head tube 2.

[0039] As Figure 1 shown, the butt joint direction between the head tube 2 and the inclined tube 1 can generally be the front-back direction, and a part of the weld bead 3 can generally extend along the front-back direction. This part of the weld bead 3 is the transverse section 31, and the transverse section 31 can be distributed on both the inclined tube 1 and the head tube 2 at the same time.

[0040] There is a stress concentration point 4 at the connection between the inclined tube 1 and the head tube 2, and the weld bead 3 and the stress concentration point 4 are arranged non-coincidentally. For example, as Figure 1 shown, since the front wheel etc. will be installed below the head tube 2, during driving, due to reasons such as road surface bumps, the head tube 2 will be subjected to the force of the front wheel and tend to swing forward. Under this force, the bottom position of the connection between the head tube 2 and the inclined tube 1 is likely to crack. The bottom position of this connection is the stress concentration point 4, specifically as Figure 1 shown in the position.

[0041] The weld bead 3 can generally be located above the stress concentration point 4, that is, the weld bead 3 and the stress concentration point 4 can be arranged in a staggered manner in space. Thus, it is possible to avoid the damage to the material properties of the metal material caused by high temperature etc. during the welding process, and fully ensure the structural strength of the material itself at the stress concentration point 4.

[0042] For the head tube and inclined tube assembly 100 of the embodiment of the present utility model, by designing a part of the weld bead 3 as the transverse section 31, the transverse section 31 can bear greater force in the butt joint direction between the inclined tube 1 and the head tube 2. That is, compared with the original situation where the weld bead 3 was prone to cracking under tension, the transverse section 31 can be regarded as bearing shear force, thus fully ensuring the connection structure strength between the head tube 2 and the inclined tube 1 and avoiding the situation of easy cracking during use.

[0043] Secondly, since the weld bead 3 and the stress concentration point 4 are arranged non-coincidentally as a whole, the stress concentration point 4 will not be affected by welding, that is, the high temperature during the welding process will not damage the material properties of the metal material at the stress concentration point 4, thus fully ensuring the material structure strength at the stress concentration point 4 and further avoiding the problem of easy cracking at the connection between the inclined tube 1 and the head tube 2 due to the decrease in the structural strength of the material itself.

[0044] In some embodiments, a welding groove 5 is provided at the connection between the inclined tube 1 and the head tube 2. The welding groove 5 extends along the butt joint direction, and the transverse section 31 is disposed within the welding groove 5. For example, the connection between the inclined tube 1 and the head tube 2 can be regarded as a region at the butt joint position of the inclined tube 1 and the head tube 2. As Figure 2 and Figure 3 shown, the welding groove 5 can be provided on the left side or the right side of the connection. The welding groove 5 as a whole can be a long groove and generally extends along the front-rear direction.

[0045] During welding, welding rods and the like can be loaded into the welding groove 5. After welding, the transverse section 31 of the above-mentioned weld bead 3 can be formed, thereby further enhancing the structural strength of the welded fixation and also avoiding the situation where the transverse section 31 protrudes too much, which is beneficial to improving the appearance.

[0046] In some embodiments, two welding grooves 5 are provided. The two welding grooves 5 are arranged opposite to each other in the horizontal direction orthogonal to the butt joint direction. The weld bead 3 includes two transverse sections 31, and the two transverse sections 31 are respectively disposed within the two welding grooves 5.

[0047] For example, one welding groove 5 can be provided on each of the left side and the right side of the above-mentioned connection. The two welding grooves 5 are generally mirror-symmetrically arranged in the left-right direction. As Figure 4 shown, one transverse section 31 is provided at each of the two ends of the weld bead 3, and the two transverse sections 31 can be correspondingly fitted into the above-mentioned two welding grooves 5 one by one. Thus, the structural strength and the stability of the force on the left and right sides of the inclined tube 1 and the head tube 2 are ensured.

[0048] In some embodiments, the weld bead 3 extends along the circumferential direction of the connection between the inclined tube 1 and the head tube 2, and the two transverse sections 31 are respectively disposed at the two ends of the weld bead 3. For example, as Figure 4 shown, the weld bead 3 as a whole can be a U-shaped structure, and the weld bead 3 can extend and be arranged along the left side, the top side, and the right side of the connection. The two transverse sections 31 can be respectively disposed at the left end and the right end of the weld bead 3.

[0049] In some embodiments, as Figure 1 shown, a stress concentration point 4 is formed at the bottom of the connection between the inclined tube 1 and the head tube 2. The weld bead 3 is located above the stress concentration point 4 and is spaced from the stress concentration point 4. Specifically, the above-mentioned two transverse sections 31 can both be located at the end of the weld bead 3 facing the stress concentration point 4, and the two transverse sections 31 are both located above the stress concentration point 4 and are spaced from the stress concentration point 4. Thus, the situation of cracking at the stress concentration point 4 is fully avoided by the connection and fixation of the two transverse sections 31.

[0050] In some embodiments, the inclined tube 1 is provided with a plug-in portion 11, and the head tube 2 is provided with an opening 22 communicating with the inner hole 21 of the head tube 2. The plug-in portion 11 passes through the opening 22 and is plug-fitted into the inner hole 21 of the head tube 2.

[0051] For example, Figure 4 and Figure 5 As shown, the plug-in portion 11 can be integrally formed at the front end of the oblique tube 1. The plug-in portion 11 can be generally a wedge-shaped structure or a frustum-shaped structure, etc. The head tube 2 can be generally a circular tube. The internal space of the head tube 2 is the inner hole 21. The rear side tube wall of the head tube 2 is provided with an opening 22, and the opening 22 is connected to the inner hole 21.

[0052] During assembly, the plug-in portion 11 can be directly inserted into the inner hole 21 of the head pipe 2 from the opening 22, thereby facilitating the pre-fixation of the oblique pipe 1 and the head pipe 2, and further facilitating subsequent welding operations, etc., and also being conducive to enhancing the quality of welding.

[0053] In some embodiments, the plug-in portion 11 is provided with a first hook portion 12 , and the opening 22 is provided with a second hook portion 23 , and the first hook portion 12 and the second hook portion 23 are hooked and matched.

[0054] For example, Figure 4 As shown, the first hook portion 12 can be integrally formed at the bottom of the plug-in portion 11, and a portion of the bottom of the plug-in portion 11 can protrude downward, and the protruding portion is the first hook portion 12. The bottom wall of the opening 22 can form a second hook portion 23. When assembling, as Figure 5 As shown, the second hook portion 23 can be inserted into the V-shaped groove between the first hook portion 12 and the oblique tube 1 .

[0055] The hooking cooperation of the first hook part 12 and the second hook part 23 can further enhance the strength of the connection structure between the bevel tube 1 and the head tube 2. Secondly, due to the hooking limit of the first hook part 12 and the second hook part 23, the butt clearance between the bevel tube 1 and the head tube 2 during assembly can be kept within a suitable range, avoiding the situation in the prior art where the gap size is difficult to control and the welding quality is difficult to control, thereby further ensuring the strength of the connection structure after welding.

[0056] In some embodiments, Figure 4 and Figure 5 As shown, the first hook portion 12 and the second hook portion 23 are both arranged at the bottom of the connection between the oblique tube 1 and the head tube 2. During driving, the head tube 2 has a tendency to swing forward and upward, and the first hook portion 12 and the second hook portion 23 can play a role of limiting constraint, and the above-mentioned transverse section 31 can play a role of limiting constraint. Through these two limiting constraints, the strength of the connection structure between the oblique tube 1 and the head tube 2 is fully guaranteed.

[0057] In some embodiments, the plug-in portion 11 abuts against the inner wall of the head pipe 2 in the docking direction. Figure 5As shown, the front end of the plug-in portion 11 can be in abutment contact with the front inner wall of the head tube 2. During use, when the handlebar is pressed down, the head tube 2 will also have a tendency to swing backward and downward, and the abutment of the plug-in portion 11 can eliminate the downward swinging movement of the head tube 2, further ensuring the stability of the assembly between the oblique tube 1 and the head tube 2, and further avoiding the situation where the connection is easy to crack.

[0058] In some embodiments, the plug-in portion 11 is welded to the head pipe 2, and a welding hole 24 for welding is provided on the wall of the head pipe 2. Figure 4 As shown, two welding holes 24 may be provided, and the two welding holes 24 may be respectively provided on the left and right tube walls of the head tube 2, and the two welding holes 24 may be arranged opposite to each other in the left-right direction. After the inclined tube 1 and the head tube 2 are pre-fixed, solder or the like may be filled into the two welding holes 24, and then the plug-in portion 11 and the head tube 2 may be fixed by welding at the welding holes 24, thereby further ensuring the strength of the connection structure between the inclined tube 1 and the head tube 2.

[0059] The following describes a vehicle according to an embodiment of the present utility model.

[0060] The vehicle of the embodiment of the utility model includes a head pipe oblique pipe assembly 100, and the head pipe oblique pipe assembly 100 can be the head pipe oblique pipe assembly 100 described in any of the above embodiments. Figure 6 As shown, the vehicle may be a scooter. In some other embodiments, the vehicle may also be a bicycle, a balance vehicle or other means of transportation.

[0061] The vehicle of the embodiment of the utility model adopts the head pipe oblique pipe assembly 100, thereby fully ensuring the strength of the connection structure between the head pipe and the oblique pipe, avoiding the problem of easy cracking between the head pipe and the oblique pipe, and improving driving safety.

[0062] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A head tube and inclined tube assembly, characterized in that, Comprising a welded inclined tube and a head tube, the weld bead between the inclined tube and the head tube includes a transverse section which extends along the butt joint direction of the inclined tube and the head tube, and there is a stress concentration point at the connection of the inclined tube and the head tube, and the weld bead and the stress concentration point are arranged non - coincidentally.

2. The head tube inclined tube assembly according to claim 1, characterized in that, A weld groove is provided at the connection of the inclined tube and the head tube, the weld groove extends along the butt joint direction, and the transverse section is arranged in the weld groove.

3. The head tube and inclined tube assembly according to claim 2, wherein, There are two weld grooves, and the two weld grooves are arranged oppositely in the horizontal direction orthogonal to the butt joint direction. The weld bead includes two transverse sections, and the two transverse sections are respectively arranged in the two weld grooves.

4. The head tube inclined tube assembly according to claim 3, characterized in that, The weld bead extends circumferentially along the connection of the inclined tube and the head tube, and the two transverse sections are respectively arranged at the two ends of the weld bead.

5. The head tube inclined tube assembly according to claim 1, wherein, The stress concentration point is formed at the bottom of the connection of the inclined tube and the head tube, and the weld bead is located above the stress concentration point and arranged at an interval from the stress concentration point.

6. The head tube inclined tube assembly according to any one of claims 1-5, characterized in that The inclined tube is provided with a plug - in part, the head tube is provided with an opening communicating with the inner hole of the head tube, and the plug - in part passes through the opening and is plug - fitted in the inner hole of the head tube.

7. The head tube inclined tube assembly according to claim 6, characterized in that, The plug - in part is provided with a first hook part, and the opening is provided with a second hook part, and the first hook part and the second hook part are hooked and fitted.

8. The head tube inclined tube assembly according to claim 7, characterized in that, Both the first hook part and the second hook part are arranged at the bottom of the connection of the inclined tube and the head tube.

9. The head tube and inclined tube assembly according to claim 6, characterized in that, The plug - in part abuts against the inner wall of the head tube in the butt joint direction; and / or, the plug - in part is welded to the head tube, and a welding hole for welding is provided on the wall of the head tube.

10. A vehicle, characterized in that, Comprising a head tube and inclined tube assembly according to any one of claims 1 - 9 above.

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