CN113928461B - Method and structure for combining lower tube of electric bicycle frame - Google Patents
Method and structure for combining lower tube of electric bicycle frame Download PDFInfo
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- CN113928461B CN113928461B CN202010604459.8A CN202010604459A CN113928461B CN 113928461 B CN113928461 B CN 113928461B CN 202010604459 A CN202010604459 A CN 202010604459A CN 113928461 B CN113928461 B CN 113928461B
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000003466 welding Methods 0.000 claims abstract description 24
- 230000003014 reinforcing effect Effects 0.000 claims description 95
- 238000005304 joining Methods 0.000 claims description 17
- 238000010168 coupling process Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims 2
- 230000002787 reinforcement Effects 0.000 description 54
- 239000011324 bead Substances 0.000 description 38
- 238000006073 displacement reaction Methods 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K19/00—Cycle frames
- B62K19/18—Joints between frame members
- B62K19/20—Joints between frame members welded, soldered, or brazed
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automatic Cycles, And Cycles In General (AREA)
Abstract
The invention relates to a method for combining a lower tube of an electric bicycle frame and a combination structure thereof, comprising the following steps: a step of welding a head pipe and a reinforced pipe, which combines the head pipe and the reinforced pipe at an angle; a step of welding a head pipe and a lower pipe, which is to sleeve the reinforced pipe into a lower pipe, expose the bottom ends of the head pipe and the reinforced pipe and then weld the corresponding positions of the top ends of the head pipe and the lower pipe; a motor bracket welding step, namely sleeving the front end side of the motor bracket on the bottom end of the lower pipe and the bottom end of the reinforced pipe at the same time and then welding; and a step of connecting the reinforced pipe and the lower pipe, namely welding two sides of the middle section of the reinforced pipe and the inner wall of the lower pipe from the opening of the lower pipe; by means of the steps of the method, the structural strength and the combination process simplification of the frame lower pipe can be considered simultaneously.
Description
Technical Field
The invention relates to a manufacturing technology of an electric bicycle frame, in particular to a method for combining a lower tube of an electric bicycle frame and a combination structure of the lower tube.
Background
The electric bicycle has no waste gas emission problem, can be continuously used only by charging and replacing the battery, is more environment-friendly compared with a common locomotive using fossil energy, and is popular with the public.
However, the electric bicycle must support the total weight W of the frame, the motor, the battery and the rider, and the front wheel and the rear wheel must support the reaction force P1 and the reaction force P2 of the road surface as shown in fig. 12, so the bending moment T, the forward stress, the shearing force, and the like, which are received by the electric bicycle frame 5, are all larger than those received by the frame of the human-powered bicycle.
Therefore, the structural rigidity, strength, shear resistance, bending resistance, torsion resistance and the like of the electric bicycle frame 5 are all more strict than those of a frame of a manual bicycle, and particularly, the lower pipe 51 is located at a key position of the electric bicycle frame, and the battery is usually installed inside the lower pipe, so that the structure of the lower pipe must be strengthened, and the safety coefficient of the whole electric bicycle frame 5 is improved.
As shown in fig. 13, the top end 511 and the bottom end 512 of the lower tube 51 with an opening 510 are respectively welded to a head tube 52 and a motor bracket 53, and then a reinforcing plate 54 is placed inside the lower tube 51, and then the reinforcing plate 54 is welded to the inner wall of the lower tube 51 from the opening 510 of the lower tube 51, because the reinforcing plate 54 does not extend to the head tube 52 and the motor bracket 53; therefore, the structural strength and rigidity of the down tube 51 cannot be increased by this down tube reinforcement method, i.e., the safety factor of the whole electric bicycle frame 5 cannot be greatly increased, and the welding process of the down tube 51 and the reinforcement piece 54 is complicated, which consumes much welding time and increases the manufacturing cost.
Another conventional down tube reinforcement structure of frame 5 of electric bicycle is of aluminum extruded reinforcement type, as shown in fig. 14, an aluminum extruded down tube 51 is adopted, and then the top end 511 and the bottom end 512 of the down tube with an opening 510 are respectively welded to a head tube 52 and a motor bracket 53, the opening 510 is introduced below the down tube 51, and the reinforcement is integrally formed above the down tube 51, similarly, the aluminum extruded reinforcement 54 does not extend to the head tube 52 and the motor bracket 53; therefore, the down tube reinforcement method cannot increase the structural strength and rigidity of the down tube 51, i.e., cannot greatly increase the safety factor of the entire electric bicycle frame 5.
Disclosure of Invention
Accordingly, in view of the problem that the conventional down tube reinforced structure of the down tube of the electric bicycle cannot satisfy both the "reinforced frame structure" and the "simplified down tube coupling process", the present inventors have made extensive efforts to develop a method and a structure for coupling the down tube of the electric bicycle, so that the present invention has the following main objectives: provides a method for combining down tubes of an electric bicycle frame and a combination structure thereof, which can combine a reinforced frame structure and a simplified down tube combination process.
In order to achieve the above object, the present invention employs the following technical means:
the invention relates to a method for combining a lower tube of an electric bicycle frame, which comprises the following steps: a step of combining a head pipe and a reinforcing pipe, wherein the head pipe and the reinforcing pipe are combined at an angle; a step of combining a head pipe with a lower pipe, which is to sleeve the reinforced pipe into a lower pipe with an opening and then combine the head pipe with the lower pipe; a motor bracket combining step, wherein one end of the motor bracket is sleeved on the lower pipe and the reinforced pipe for combination; and a step of combining the reinforced pipe with the lower pipe, wherein two sides of the middle section of the reinforced pipe are welded and combined with the inner wall of the lower pipe from an opening arranged on the lower pipe; therefore, the structural strength and the combination process of the frame lower tube can be simplified at the same time.
The method for combining the lower tube of the electric bicycle frame comprises the step of combining the reinforcing tube into a first reinforcing rod and a second reinforcing rod, wherein the first reinforcing rod is welded or integrally formed with the head tube in the step of combining the head tube with the reinforcing tube, and the second reinforcing rod is welded or integrally formed with the motor bracket in the step of combining the motor bracket.
The method for combining the lower tube of the electric bicycle frame comprises the steps of setting the reinforcing tube to be a first reinforcing rod and a second reinforcing rod, wherein the first reinforcing rod is longer than the second reinforcing rod, the first reinforcing rod is combined with the head tube in the step of combining the head tube with the reinforcing tube, the second reinforcing rod is combined with the motor bracket after being butted with the first reinforcing rod in the step of combining the motor bracket, and finally, the first reinforcing rod and the second reinforcing rod are welded and combined together in the step of combining the reinforcing tube with the lower tube.
The method for combining the lower tube of the electric bicycle frame comprises the steps of arranging the reinforcing tube into a first reinforcing rod and a second reinforcing rod, wherein the first reinforcing rod is longer than the second reinforcing rod, the first reinforcing rod is combined with the head tube in the step of combining the head tube with the reinforcing tube, the second reinforcing rod and the motor bracket are integrally formed, the second reinforcing rod is butted with the first reinforcing rod in the step of combining the motor bracket, and finally, the first reinforcing rod and the second reinforcing rod are welded and combined together in the step of combining the reinforcing tube with the lower tube.
The method for combining the lower tube of the electric bicycle frame comprises the steps of arranging the reinforcing tube into a first reinforcing rod and a second reinforcing rod, wherein the first reinforcing rod is shorter than the second reinforcing rod, the first reinforcing rod is integrally formed with the head tube in the step of combining the head tube with the reinforcing tube, the second reinforcing rod is abutted with the first reinforcing rod in the step of combining the motor bracket and then is combined with the motor bracket, and finally, the first reinforcing rod and the second reinforcing rod are welded and combined together in the step of combining the reinforcing tube with the lower tube.
The method for combining the lower tube of the electric bicycle frame comprises the following steps that two ends of the lower tube are welded with the head tube and the motor bracket; the bottom end of the reinforced pipe is sleeved with a through hole arranged on the motor bracket or an integrated lapping device; the joint between the head pipe and the reinforcing pipe is formed by welding the head pipe to the reinforcing pipe from the outside or the inside of the head pipe.
The invention relates to a lower tube combining structure of an electric bicycle frame, which comprises: a head pipe; a lower tube, which is provided with an opening and a reinforced tube arranged in the lower tube, and the top ends of the lower tube and the reinforced tube jointly present an angle and are combined with the head tube; and a motor bracket having one end coupled to the lower tube and the bottom end of the reinforcement tube; the opening is arranged on the side surface of the lower pipe, two sides of the middle section of the reinforced pipe are welded and combined with the inner wall of the lower pipe from the opening of the lower pipe, and the head pipe, the reinforced pipe, the lower pipe and the motor bracket are combined together by virtue of the opening.
The electric bicycle frame lower tube combination structure is characterized in that the reinforced tube is combined on the inner wall of the lower tube.
The frame lower pipe combination structure of the electric bicycle is characterized in that the reinforced pipe is formed by welding and butting a first reinforced rod and a second reinforced rod, the first reinforced rod and the head pipe are combined in a welding or integrated forming mode, and the second reinforced rod and the motor bracket are combined in a welding or integrated forming mode.
The first reinforcing rod is longer than or shorter than the second reinforcing rod, and two ends of the lower pipe are welded with the head pipe and the motor bracket.
The frame lower tube combination structure of the electric bicycle is characterized in that the motor bracket is provided with a through hole or an integrated lapping device, the head tube is provided with a through hole, the top end of the reinforced tube extends into the through hole, and an integrated decorative cover covers the outer side of the through hole.
Compared with the background art, the invention can achieve the following effects by means of the technical means:
the invention extends the structural strength of the reinforcing rod to the head tube and the motor bracket, and elaborately designs the combination mode of the lower tube, the head tube and the motor bracket by matching with the single-piece type or two-piece type of the reinforcing rod, thereby improving the structural strength and the rigidity of the frame, simplifying the combination process of the lower tube and reducing the processing cost of the lower tube.
The lower tube combination mode can effectively improve the integral structural strength and rigidity of the electric bicycle frame by about 37 percent, thereby being beneficial to the performances of bending resistance, shearing resistance, torsion resistance and the like of the electric bicycle frame and further greatly improving the integral safety coefficient of the electric bicycle frame.
Drawings
FIG. 1 is a flow chart of the steps of the method for joining the lower tube of the frame of the electric bicycle according to the present invention.
Fig. 2 is an external view of the first embodiment of the present invention.
Fig. 3 is an exploded view of the first embodiment of the present invention.
Fig. 4A is a cross-sectional view of a first embodiment of the present invention.
Fig. 4B is a cross-sectional view of a fifth embodiment of the present invention.
Fig. 4C is a cross-sectional view of a sixth embodiment of the present invention.
Fig. 5 is a cross-sectional view of a cross-section of a lower pipe according to a first embodiment of the present invention.
Fig. 6 is a cross-sectional view of a second embodiment of the present invention.
Fig. 7 is an exploded view of a third embodiment of the present invention.
Fig. 8 is a cross-sectional view of a third embodiment of the present invention.
Fig. 9 is an exploded view of a fourth embodiment of the present invention.
Fig. 10 is a cross-sectional view of a fourth embodiment of the present invention.
FIG. 11 is a line graph showing the relationship between the displacement of the bicycle frame structure of the present invention and the conventional bicycle frame structure after being subjected to a load.
FIG. 12 is a force analysis diagram of the frame of the electric bicycle according to the present invention.
Fig. 13 is a view of a conventional electric bicycle frame.
FIG. 14 is a perspective view of another conventional electric bicycle frame.
Description of the reference numerals: a-a method for combining a lower tube of an electric bicycle frame; b1 — first example; b1-1-fifth example; b1-2-sixth example; b2-second example; b3-the third embodiment; b4-fourth example; a-step; b-step; c, step (c); d-step; 1-head pipe; 11-a through hole; 12-an integrated decorative cover; 2-reinforcing the pipe; 21-a first reinforcement bar; 22-a second reinforcing bar; 3-lower tube; 30-inner wall; 31-an opening; 4-a motor bracket; 41-perforating; 42-a lap joint device; k-welding bead; an L-weld bead; m-welding bead; n-welding bead; o-welding bead; q-welding bead; 5-electric bicycle frame; 51-a lower tube; 510-an opening; 511-top; 512-bottom end; 52-head tube; 53-motor bracket; 54-reinforcing sheet.
Detailed Description
The invention relates to a method for combining a lower tube of an electric bicycle frame and a combination structure thereof, wherein the method A for combining the lower tube of the electric bicycle frame can not only simplify the combination process of the lower tube, but also strengthen the structural strength and the rigidity of the lower tube; first, referring to fig. 1 to 5, a method a for combining a frame lower tube of an electric bicycle according to a first embodiment B1 of the present invention includes: a head pipe and reinforcement pipe combining step a, a head pipe and lower pipe combining step b, a motor bracket combining step c, a reinforcement pipe and lower pipe combining step, etc., as shown in fig. 1; in particular, the weld beads (K, L, M, N, Q) described below are closed weld paths, except that the weld bead O is a continuous or discontinuous linear weld path, and the weld bead Q is an open weld path.
In the step a of combining the head pipe and the reinforcement pipe, as shown in fig. 2 to 4A, one end of a head pipe 1 and one end of a reinforcement pipe 2 are welded and combined at an angle to form a weld bead K, and the weld bead K is located outside the head pipe 1 and the reinforcement pipe 2; the step b of combining the head pipe and the lower pipe is to sleeve the reinforced pipe 2 into a lower pipe 3 with an opening 31 and then weld and combine the top ends of the head pipe 1 and the lower pipe 3 to form a weld bead L; the motor bracket combining step c is to sleeve the end of the motor bracket 4 with a through hole 41 on the bottom end of the lower tube 3 and the bottom end of the reinforced tube 2 to perform welding combination to form a weld bead M and a weld bead N, i.e. the bottom end of the reinforced tube 2 is covered by the thickness of the motor bracket 4 and is welded into the weld bead N, so as to achieve the function of positioning and fixing the reinforced tube 2; and the step d of combining the reinforced pipe with the lower pipe, wherein two sides of the middle section of the reinforced pipe 2 and the inner wall 30 of the lower pipe 3 are welded and combined from the opening 31 arranged on the lower pipe 3 to form a welding bead O; the head pipe 1, the reinforcing pipe 2, and the down pipe 3 are made of aluminum, and the motor bracket 4 is made of an aluminum alloy, such as a gravity cast molding or a forged molding.
In other words, the sequence of the bonding method used in the first embodiment B1 of the present invention is to complete the weld bead K, then complete the weld bead L, then complete the weld bead M and the weld bead N, and finally complete the weld bead O from the opening 31 of the lower pipe 3.
Furthermore, a fifth embodiment B1-1 and a sixth embodiment B1-2 can be derived from the first embodiment B1 of the present invention; the difference between the fifth embodiment B1-1 of the present invention and the first embodiment B1: as shown in FIG. 4B, a through hole 11 is formed on the head tube 1, and the top end of the reinforced tube 2 is extended into the through hole 11 to perform the combination of the inner welding bead K, and then an integrated decorative cover 12 is used to cover the front surface of the head tube 1.
Further, the difference between the sixth embodiment B1-2 of the present invention and the fifth embodiment B1-1: as shown in fig. 4C, the motor bracket is provided with an integrally formed joint device 42, and the bottom end of the reinforcement pipe 2 is fitted into the joint device 42 to perform the joining of the inner weld bead N.
Referring to fig. 1 and 6, a second embodiment B2 of the present invention is shown in which the method a for joining a lower tube of an electric bicycle frame is used, and the reinforcement tube 2 is further butt-joined by a first reinforcement rod 21 and a second reinforcement rod 22, wherein the first reinforcement rod 21 is longer than the second reinforcement rod 22, the first reinforcement rod 21 is welded to the head tube 1 in a step a for joining the head tube and the reinforcement tube to form the weld bead K, the second reinforcement rod 22 is welded to the motor bracket 4 in a step c for joining the motor bracket to form the weld bead N, and finally both the first reinforcement rod 21 and the second reinforcement rod 22 are welded to form the weld bead Q in a step d for joining the reinforcement tube and the lower tube.
In other words, the sequence of the bonding method used in the second embodiment B2 of the present invention is to complete the weld pass K, then complete the weld pass L, then complete the weld passes M and N, and finally complete the weld passes O and Q from the opening 31 of the lower pipe 3.
Referring to fig. 1, 7 and 8, a third embodiment B3 of the present invention is shown, in which the method a for joining a lower tube of an electric bicycle frame is used, and the reinforcement tube 2 is further butt-joined by a first reinforcement rod 21 and a second reinforcement rod 22, wherein the first reinforcement rod 21 is longer than the second reinforcement rod 22, the first reinforcement rod 21 is joined to the head tube 1 by welding the bead K in the step a for joining the head tube and the reinforcement tube, the second reinforcement rod 22 is integrally formed with the motor bracket 4, the second reinforcement rod 22 is butt-joined to the first reinforcement rod 21 in the step c for joining the motor bracket, and finally both the first reinforcement rod 21 and the second reinforcement rod 22 are welded together to form the bead Q in the step d for joining the reinforcement tube and the lower tube.
In other words, the sequence of the bonding method used in the third embodiment B3 of the present invention is to complete the weld bead K, then complete the weld bead L, then complete the weld bead M, and finally complete the weld beads O and Q from the opening 31 of the lower pipe 3.
Referring to fig. 1, 9 and 10, a fourth embodiment B4 of the present invention is a method of joining a lower tube of an electric bicycle frame by using the method a, wherein the reinforcement tube 2 is further provided with a first reinforcement rod 21 and a second reinforcement rod 22, the first reinforcement rod 21 is shorter than the second reinforcement rod 22, the first reinforcement rod 21 is integrally formed with the head tube 1 in the step a of joining the head tube and the reinforcement tube, the second reinforcement rod 22 is joined to the motor bracket 4 after being abutted to the first reinforcement rod 21 in the step c of joining the motor bracket, and finally both the first reinforcement rod 21 and the second reinforcement rod 22 are welded to form a weld bead Q in the step d of joining the reinforcement tube and the lower tube.
In other words, the sequence of the bonding method used in the fourth embodiment B4 of the present invention is to complete the weld bead L, then complete the weld bead M and the weld bead N, and finally complete the weld bead O and the weld bead Q from the opening 31 of the lower pipe 3.
Therefore, there are four examples of the lower tube coupling structure of the electric bicycle frame of the present invention, wherein the first embodiment B1 comprises: a head pipe 1, which is combined with the top end of a reinforced pipe 2 in an angle from the pipe body; a lower tube 3 having an opening 31, the top end of the lower tube 3 being sleeved into the reinforcement tube 2 and then being coupled to the head tube 1, and the reinforcement tube 2 being coupled to the inner wall 30 of the lower tube 3; and a motor bracket 4 having one end of a through hole 41 combined with the lower tube 3 and the bottom end of the reinforcing tube 2; the opening 31 facilitates the combination of the head pipe 1, the reinforcement pipe 2, the down tube 3 and the motor bracket 4, thereby improving the structural strength of the electric bicycle frame.
As shown in the second embodiment B2 (fig. 6), the third embodiment B3 (fig. 8) and the fourth embodiment B4 (fig. 10), the reinforcing tube 2 is formed by welding and abutting a first reinforcing rod 21 and a second reinforcing rod 22, the first reinforcing rod 21 and the head tube 1 can be welded or integrally formed, and the second reinforcing rod 22 and the motor bracket 4 can be welded or integrally formed; and the first reinforcing bar 21 is longer or shorter than the second reinforcing bar 22, and the two ends of the lower tube 3 are welded to the head tube 1 and the motor bracket 4.
Referring to fig. 11 and 12, the rigidity of the one-piece frame of the present invention and the conventional one-piece frame were tested to obtain the data as shown in the following table one:
watch 1
| Weight (kg) | Displacement (mm) of the invention's integral frame | Displacement (mm) of learning type integral frame without reinforced |
| 20 | 0 | 0 |
| 30 | 0.76 | 1.2 |
| 40 | 1.51 | 2.38 |
| 50 | 2.29 | 3.62 |
When each frame is subjected to rigidity test on a machine table, firstly fixing a motor bracket of the frame, then installing a long-rod type measuring jig into a head pipe 1, taking the center of the head pipe 1 as the center, arranging a jacking seat below the center, taking two end sides of each 30 cm position of the center, hoisting a load at one end and measuring the displacement of the jig at the other end according to the seesaw principle, hoisting 20kg of the load in advance at first, then sequentially weighting to 30kg, 40kg and 50kg, and finally drawing a graph of the relationship between the load and the displacement of the frame shown in figure 11; in other words, after testing, the slope of the line graph of the frame of the electric bicycle is significantly lower than that of the conventional frame, so that the overall structural strength and rigidity of the frame of the electric bicycle can be effectively improved by about 37% by using the down tube combination method of the embodiments of the present invention.
Claims (10)
1. A method for combining a lower tube of a frame of an electric bicycle is characterized by comprising the following steps:
a step of combining a head tube and a reinforced tube, wherein the head tube and the reinforced tube are combined in an angle;
a step of combining a head pipe with a lower pipe, which is to sleeve the reinforced pipe into a lower pipe with an opening and then combine the head pipe with the lower pipe;
a motor bracket combining step, namely, one end of the motor bracket is sleeved on the lower pipe and the reinforced pipe for combination; and
a step of combining the reinforced pipe with the lower pipe, which is to weld and combine two sides of the middle section of the reinforced pipe with the inner wall of the lower pipe from the opening of the lower pipe.
2. The method for combining the lower tube of the electric bicycle frame as claimed in claim 1, wherein: the reinforcing tube is set to be a first reinforcing rod and a second reinforcing rod, and the first reinforcing rod is set to be welded or integrally formed with the head tube in the head tube and reinforcing tube combining step, and the second reinforcing rod is set to be welded or integrally formed with the motor bracket in the motor bracket combining step.
3. The method for joining a lower tube of an electric bicycle frame as claimed in claim 2, wherein: the method comprises the steps of arranging the reinforced pipe into a first reinforced rod and a second reinforced rod, wherein the first reinforced rod is longer than the second reinforced rod, the first reinforced rod is combined with the head pipe in the step of combining the head pipe and the reinforced pipe, the second reinforced rod is combined with the motor bracket after being butted with the first reinforced rod in the step of combining the motor bracket, and finally, the first reinforced rod and the second reinforced rod are welded and combined together in the step of combining the reinforced pipe and the lower pipe.
4. The method for joining a lower tube of an electric bicycle frame as claimed in claim 2, wherein: the reinforcing pipe is set as a first reinforcing rod and a second reinforcing rod, the first reinforcing rod is longer than the second reinforcing rod, the first reinforcing rod is combined with the head pipe in the step of combining the head pipe and the reinforcing pipe, the second reinforcing rod and the motor bracket are set as an integral molding, the second reinforcing rod is butted with the first reinforcing rod in the step of combining the motor bracket, and finally, the first reinforcing rod and the second reinforcing rod are welded and combined together in the step of combining the reinforcing pipe and the lower pipe.
5. The method for joining a lower tube of an electric bicycle frame as claimed in claim 2, wherein: the reinforcing pipe is set to be a first reinforcing rod and a second reinforcing rod, the first reinforcing rod is shorter than the second reinforcing rod, the first reinforcing rod is set to be integrally formed with the head pipe in the head pipe and reinforcing pipe combining step, the second reinforcing rod is abutted with the first reinforcing rod in the motor bracket combining step and then combined with the motor bracket, and finally, the first reinforcing rod and the second reinforcing rod are welded and combined together in the reinforcing pipe and lower pipe combining step.
6. The method for combining the lower tube of the electric bicycle frame according to any one of claims 1 to 5, wherein: the two ends of the lower pipe are welded with the head pipe and the motor bracket; the bottom end of the reinforced pipe is sleeved on a through hole arranged on the motor bracket or an integrated lapping device; the head pipe and the reinforced pipe are combined in a mode that the head pipe and the reinforced pipe are welded and combined from the outside or the inside of the head pipe.
7. The utility model provides an electric bicycle frame low tube integrated configuration which characterized in that contains:
a head pipe;
a lower tube, which is provided with an opening and a reinforced tube arranged in the lower tube, and the top ends of the lower tube and the reinforced tube jointly present an angle and are combined with the head tube; and
a motor bracket, one end of which is combined with the bottom ends of the lower pipe and the reinforced pipe;
the opening is arranged on the side surface of the lower pipe, two sides of the middle section of the reinforced pipe are welded and combined with the inner wall of the lower pipe from the opening of the lower pipe, and the head pipe, the reinforced pipe and the lower pipe are combined together by virtue of the opening.
8. The lower tube combining structure of the electric bicycle frame as claimed in claim 7, wherein: the reinforced pipe is combined with the inner wall of the lower pipe.
9. The electric bicycle frame lower tube combining structure of claim 8, characterized in that: the reinforced pipe is formed by welding and butting a first reinforced rod and a second reinforced rod, the first reinforced rod and the head pipe are combined in a welding or integrated mode, and the second reinforced rod and the motor bracket are combined in a welding or integrated mode.
10. The lower tube coupling structure for electric bicycle frame of claim 9, wherein: the first strengthening rod is longer or shorter than the second strengthening rod, and the two ends of the lower pipe are welded with the head pipe and the motor bracket; the motor bracket is provided with a through hole or an integrated lapping device, the head pipe is provided with a through hole, the top end of the reinforced pipe extends into the through hole, and an integrated decorative cover covers the outer side of the through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010604459.8A CN113928461B (en) | 2020-06-29 | 2020-06-29 | Method and structure for combining lower tube of electric bicycle frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010604459.8A CN113928461B (en) | 2020-06-29 | 2020-06-29 | Method and structure for combining lower tube of electric bicycle frame |
Publications (2)
| Publication Number | Publication Date |
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| CN113928461A CN113928461A (en) | 2022-01-14 |
| CN113928461B true CN113928461B (en) | 2022-11-15 |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4401680B2 (en) * | 2003-05-12 | 2010-01-20 | 川崎重工業株式会社 | Body frame of motorcycle |
| EP1803635B1 (en) * | 2005-12-09 | 2009-03-25 | Prince Sports, Inc. | Bicycle having multiple tube frame structure |
| EP2532571B1 (en) * | 2011-06-10 | 2014-03-26 | Campagnolo S.r.l. | Bicycle on-board device and related mounting method |
| KR101491653B1 (en) * | 2014-05-27 | 2015-02-09 | 윈엔윈(주) | Body frame for bikes |
| TWI602738B (en) * | 2015-12-18 | 2017-10-21 | 達方電子股份有限公司 | Electric bicycle and battery mounting device thereof |
| JP6469144B2 (en) * | 2017-01-31 | 2019-02-13 | 本田技研工業株式会社 | Small vehicle frame structure |
| KR102371244B1 (en) * | 2017-06-01 | 2022-03-04 | 현대자동차 주식회사 | Bicycle frame and manufacturing method of the same |
| TWM557699U (en) * | 2017-12-01 | 2018-04-01 | 卓楷涵 | Electric bicycle frame |
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