Frame unit of bicycle and manufacturing method thereof

Abstract

The invention provides a frame unit of a bicycle and a method of manufacturing the same. The bicycle frame unit is used for forming a bicycle frame and comprises two shell pieces and an annular supporting piece, the shell pieces are connected with each other, the annular supporting piece is combined between the two shell pieces, a combination hole is formed in the annular supporting piece, and the combination hole is configured to be matched with the outer contour of an outer column. According to the frame unit, a gap is formed between the two shell pieces and the annular supporting piece, the annular supporting piece and the two shell pieces are connected through a connecting material in the gap, the shell pieces can be designed to be thin and light, the structural strength is improved and the size is controlled through the annular supporting piece, and therefore under the condition that the weight of the frame and the manufacturing process are not excessively increased, the manufacturing cost is reduced. The problem that in the prior art, the assembling operation is affected by redundant materials generated in the jointing process is effectively solved.

Description

Technical Field

[0001] The invention relates to the manufacture of a bicycle frame, in particular to a bicycle frame unit and a manufacturing method thereof. Background Art

[0002] The existing bicycle frame is first made of multiple shells, and after the multiple shells are combined with each other, they can form the main structure of the existing bicycle frame, thereby improving production efficiency. Among them, one existing bicycle frame is made of metal materials, such as aluminum alloy, and the metal sheet is stamped into the shell by a mold, and then the multiple shells are joined by welding to form a frame unit. Another existing bicycle frame is made of thermoplastic composite materials, such as carbon fiber material, and the shell is formed by hot pressing of a mold, and then the multiple shells are joined by partial welding or secondary hot pressing welding to form a frame unit.

[0003] However, the above-mentioned conventional bicycle frame manufacturing methods all have the shape of the shell inside, which may form excess material inside the frame unit during the joining process, and affect the subsequent assembly of other bicycle parts. For example, the excess material formed in the seat tube area may easily hinder the insertion of the seat post, and the excess material formed in the head tube area may hinder the passage of the front fork.

[0004] If the shell is trimmed to solve the problem of excess material, it will increase the number of processes, reduce production efficiency, and make it difficult to control the size or cause the structural strength of the frame unit to be insufficient. In summary, when manufacturing the existing bicycle frame, there is a problem that the excess material generated during the joining process will affect the assembly operation, and there is indeed room for improvement. Summary of the invention

[0005] In order to solve the problem that during the manufacturing of the existing bicycle frame, the redundant material generated during the joining process will affect the assembly operation, the present invention provides a bicycle frame unit and a manufacturing method thereof, which effectively improves the above-mentioned problem without excessively increasing the weight of the frame and the manufacturing process by simultaneously joining the annular support member and the two shell members, as further described below.

[0006] The present invention provides a frame unit, which is used to form a bicycle frame. The frame unit comprises:

[0007] Two shells, the two shells are joined to each other along a joining direction, and the two shells are substantially symmetrical to each other;

[0008] At least one annular support member, the annular support member is combined between the two shell members, and a combination hole is provided in the annular support member, and the combination hole is configured to match the outer contour of an outer column;

[0009] The frame unit forms at least one gap between the two shells and the annular support member, and the gap is filled with a bonding material.

[0010] In the above frame unit, the gap is formed between the two shells when the two shells are respectively against the annular support; or is formed between the annular support and the shell when the annular support is located between the two shells.

[0011] Furthermore, in the above frame unit, the bonding material is at least one of solder, a molten portion on the annular support member, and a molten portion on the shell member.

[0012] Furthermore, in the above-mentioned frame unit, each of the shell components includes at least one swing arm joint portion, the swing arm joint portion protrudes from the shell component in a direction perpendicular to the joining direction, and is provided with a pivot hole passing through the shell component along the joining direction, and the swing arm joint portions of the two shell components are symmetrically arranged.

[0013] Preferably, in the above-mentioned frame unit, the swing arm joint is used to pivotally connect a shock absorber, a seat fork or a chain fork.

[0014] Preferably, the frame unit comprises an operation port communicating with the inner and outer sides of the two shells, and the operation port is disposed through one of the shells or is formed by the two shells.

[0015] The present invention also provides a method for manufacturing a bicycle frame unit, which comprises the following steps:

[0016] Shell forming step: forming two shells from the sheet material by a mold, so that the two shells are substantially symmetrical to each other and can be aligned with each other along a joining direction;

[0017] A docking step: docking the two shells along the joining direction, placing an annular support member in the two shells, and forming a gap between the two shells and the annular support member; and

[0018] Joining step: using a joining means to join the two shell parts to each other, and allowing the gap to be filled with a joining material, thereby forming a frame unit.

[0019] The manufacturing method of the above-mentioned bicycle frame unit, wherein in the shell forming step, the two shells are respectively provided with at least one swing arm joint portion by mold forming, and the swing arm joint portion protrudes from the shell along a direction perpendicular to the joining direction, and after the joining step is completed, a pivot hole is formed on the swing arm joint portion and passes through the shell along the joining direction, and the swing arm joint portions of the two shells are symmetrically arranged.

[0020] Furthermore, in the manufacturing method of the bicycle frame unit, in the shell forming step, an operating port is formed on the shell to connect the inner and outer sides of the shell.

[0021] Furthermore, in the manufacturing method of the bicycle frame unit, after the joining step is completed, an operating port is formed on the shell component to communicate with the inner and outer sides of the shell component.

[0022] By virtue of the above-mentioned technical features, when the frame unit is joined, even if excess material is formed in the part of the bicycle components where the two shells are inserted into other external rods such as the seat post, it will be blocked outside the annular support and can be used to join the annular support and the two shells. The two shells can also be designed to be thin and lightweight, and the structural strength and size can be improved and controlled by the annular support to facilitate the assembly and combination of the external rods. Therefore, the present invention effectively improves the problem of the existing bicycle frame being produced during the joining process and affecting the assembly operation without excessively increasing the frame weight and manufacturing process, thereby providing a frame unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a side view of the appearance of the first preferred embodiment of the present invention.

[0024] Figure 2 This is a three-dimensional appearance diagram of the shell of the first preferred embodiment of the present invention.

[0025] Figure 3 It is a three-dimensional exploded view of the first preferred embodiment of the present invention.

[0026] Figure 4 It is a schematic top view of the appearance of the first preferred embodiment of the present invention before the shells are joined.

[0027] Figure 5 FIG. 4 is a flow chart of a method for manufacturing a frame unit according to a first preferred embodiment of the present invention.

[0028] Figure 6 It is a side view of the appearance of the second preferred embodiment of the present invention.

[0029] Figure 7 It is a side view of the appearance of the third preferred embodiment of the present invention.

[0030] Figure 8 This is a three-dimensional appearance diagram of the fourth preferred embodiment of the present invention.

[0031] Fig. 9 This is a three-dimensional appearance diagram of the fifth preferred embodiment of the present invention.

[0032] Fig.10 This is a side view of the appearance of a bicycle frame composed of a fifth preferred embodiment of the present invention.

[0033] Fig.11 This is a three-dimensional appearance diagram of the sixth preferred embodiment of the present invention.

[0034] Fig.12 This is a three-dimensional appearance diagram of the seventh preferred embodiment of the present invention.

[0035] Fig.13 It is a three-dimensional exploded view of the seventh preferred embodiment of the present invention.

[0036] Fig.14 It is a front cross-sectional view of the seventh preferred embodiment of the present invention.

[0037] Fig.15 It is a partially enlarged top view of the appearance of the seventh preferred embodiment of the present invention.

[0038] Fig.16 This is a side view of the appearance of a bicycle frame composed of a seventh preferred embodiment of the present invention.

[0039] Fig.17 It is a front cross-sectional view of an eighth preferred embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to understand the technical features and practical effects of the present invention in detail and to implement them according to the contents of the specification, the preferred embodiments shown in the drawings are further described in detail as follows:

[0041] The present invention provides a frame unit, which is used to form a bicycle frame. Specifically, the frame unit includes a part of the bicycle frame. For example, the frame unit can be a seat tube, including a seat tube and a motor seat, including a head tube, a lower tube and a motor seat, or including a head tube and a top tube, etc. When used to form a bicycle frame, other frame components need to be joined. The specific other frame components depend on the type of bicycle.

[0042] The first preferred embodiment of the present invention is Figures 1 to 4 As shown, the frame unit 100 is a vertical tube, including two shells 10, 20 and an annular support member 30. Figure 3 As shown, the two shells 10 and 20 are joined to each other along a joining direction D, and the two shells 10 and 20 are substantially symmetrical to each other. The joining direction D is equivalent to the left and right directions based on the forward direction of the bicycle. Figure 2 and Figure 3 As shown, one of the shells 10 includes a first portion 101, a second portion 102 and a third portion 103, and the other shell 20 includes corresponding portions, so that the portions of the two shells 10, 20 can correspond to each other and are substantially symmetrical to each other.

[0043] Furthermore, the annular support member 30 is combined between the two shell members 10, 20, and a combination hole 31 is provided in the annular support member 30, and the combination hole 31 is configured to match the outer contour of an external column. In this preferred embodiment, the first portion 101 of the shell members 10, 20 is in a tubular shape when combined, the annular support member 30 is a cylindrical inner liner tube, and the combination hole 31 of the annular support member 30 is used to match and combine with a seat pole (external column). The frame unit 100 forms at least one gap G between the two shell members 10, 20 and the annular support member 30. Figure 4 As shown, in this preferred embodiment, the gap G is formed between the two shells 10 and 20 when the two shells 10 and 20 are respectively against the outer surface of the annular support member 30. Moreover, when the two shells 10 and 20 are joined to each other, the gap G is filled with a joining material, and the joining material can join the two shells 10 and 20 and simultaneously join the annular support member 30 to the two shells 10 and 20.

[0044] Please refer to Figure 5 The manufacturing method of the frame unit 100 comprises the following steps:

[0045] Shell forming step S1: forming the two shells 10 and 20 by a mold so that the two shells 10 and 20 are substantially symmetrical to each other and can be aligned with each other along the joining direction D, that is, the first portion 101, the second portion 102 and the third portion 103 of the shell 10 are linearly opposite to the corresponding portions of the other shell 20;

[0046] Butt joint step S2: butt joint the two shells 10 and 20 along the joint direction D, and place the annular support member 30 in the two shells 10 and 20, so that a gap G is formed between the two shells 10 and 20 and the annular support member 30; and

[0047] Joining step S3: The two shells 10 and 20 are joined together by a joining means, and the gap is filled with a joining material, so as to form the frame unit 100. The details are as follows.

[0048] Specifically, the frame unit 100 can be made of metal to form a metal frame. The frame unit 100 and various frame components such as pipes can be joined to each other by welding. Among the frame components, components such as rocker arms, seat stay yokes, chain stay yokes, dropouts, bottom brackets, and pivot mounts can be made by different metal forming processes, such as casting and forging. The frame pipes can be manufactured by turning, forging, casting, or hydroforming.

[0049] Furthermore, in the shell forming step S1, the frame tube can be further processed by stamping, blanking, embossing, bending, flanging, deep drawing, stretching, ironing and coining the metal sheet to form the shells 10 and 20. The shells 10 and 20 include a semi-cylindrical structure to form a structure such as the first part 101, so that the two shells 10 and 20 can be joined to the annular support member 30 after being welded. In the first preferred embodiment of the present invention, the shells 10 and 20 are formed by die stamping, and as Figure 2 As shown, each shell 10 is provided with connecting walls 11 on opposite sides for joining with the corresponding structure of another shell 20, which can be specifically in the form of docking, overlapping, etc. As long as the main parts of the two shells 10, 20 can be joined correspondingly, the technical feature of being substantially symmetrical is met.

[0050] In the joining step S3, the joining means is welding, and the two shells 10 and 20 are welded to each other, for example, by filler-free welding (FF welding) means such as activated tungsten inert gas welding (ATIG welding), laser beam welding (LBW), and friction stir welding (FSW). In this case, the two shells 10 and 20 will be partially melted and welded to each other during the welding process, and the molten material will be used as the joining material to fill the gap G, thereby simultaneously joining the annular support member 30.

[0051] In addition, the gap G can also be formed between the annular support member 30 and the shell members 10, 20 when the connecting walls 11 of the two shell members 10, 20 abut against each other and the annular support member 30 is located between the two shell members 10, 20. In this case, during the bonding process of the two shell members 10, 20, the molten bonding material can also penetrate into the two shell members 10, 20 and fill the gap G, thereby bonding the two shell members 10, 20 and the annular support member 30 to each other.

[0052] Furthermore, in the joining step S3, the joining means may also be filler welding, and the solder used can be used as the joining material to fill the gap G, so as to join the two shells 10, 20 and the annular support member 30. If the two shells 10, 20 or the annular support member 30 are partially melted during the welding process and joined with the two shells 10, 20, they also serve as the joining material.

[0053] In addition, the frame unit 100 can also be made of thermoplastic composite material and used to form a thermoplastic composite frame. In the shell forming step S1, two thermoplastic composite plates are formed into the two shells 10 and 20 by hot pressing with a mold, wherein the thermoplastic composite plate is a thermoplastic carbon fiber plate or a thermoplastic glass fiber plate; in the docking step S2, the two shells 10 and 20 are docked along the joining direction D, and the annular support member 30 is placed in the two shells 10 and 20, and the gap G is formed between the two shells 10 and 20 and the annular support member 30; in the joining step S3, the joining means is to use a mold to hot press molding to make the two shells 10 and 20 abut or overlap, and form a welded area that is joined into one by hot pressing and welding, so that the two shells 10 and 20 are joined to each other, wherein the welded parts of the two shells 10 and 20 will fill the gap G, thereby simultaneously joining the annular support member 30.

[0054] In specific operation, in the docking step S2, an inner support member that abuts against the annular support member 30 can be set on the two shell members 10, 20, so that in the joining step S3, the mold can be hot-pressed to press the inner and outer sides to maintain high-precision production and ensure that the frame unit 100 after joining meets the design.

[0055] By virtue of the above technical features, when the frame unit 100 is joined, even if there is excess material in the first part 101 of the two shells 10, 20 (the part of the bicycle component inserted into other external rods such as the seat post), it will be blocked outside the annular support member 30 and can be used to join the annular support member 30 and the two shells 10, 20, and the two shells 10, 20 can be designed to be thin and lightweight, and the structural strength and size can be improved by the annular support member 30, which is convenient for the assembly and combination of the external rod. Therefore, the present invention has the advantages of simplified structure and high-efficiency production without excessively increasing the weight of the frame and the manufacturing process, and effectively improves the problem that the excess material generated during the joining process of the existing bicycle frame will affect the assembly operation during the manufacturing process, thereby providing a frame unit. In addition, the joining hole 31 of the annular support member 30 will not be affected by the joining means, but can maintain the true roundness, which is convenient for joining the cylindrical seat post.

[0056] Preferably, in this preferred embodiment, the size of the second part 102 and the third part 103 is larger than that of the first part 101, and has a larger internal space to accommodate external components, such as a battery unit, a data processing unit, etc. The frame unit includes an operation port 104, and the operation port 104 connects the inner and outer sides of the two shells 10, 20. In this preferred embodiment, the operation port 104 is provided on the third part 103 of one of the shells 10, so that subsequent bicycle users can charge or transmit information to the external components inside the shell 10 through the operation port 104, or perform maintenance on the components inside the shell 10 through the operation port 104. Specifically, the operation port 104 can be directly formed on the shell 10 in the shell forming step S1, or can be formed on the shell 10 after the joining step S3 is completed.

[0057] Furthermore, each of the shells 10, 20 includes two swing arm joints 12, 22 (especially when the frame unit 100 is used to form a mountain bike frame, but not limited thereto), the swing arm joints 12, 22 protrude from the shells 10, 20 in a direction perpendicular to the joint direction D, and are provided with a pivot hole 121, 221 penetrating the shells 10, 20 in the joint direction D, and the swing arm joints 12, 22 of the two shells 10, 20 are symmetrically arranged. In detail, in this preferred embodiment, the frame unit 100 is a seat tube, and the two swing arm joints 12, 22 of each of the shells 10, 20 protrude forward from the front side of the second portion 102 and rearward from the rear side of the third portion 103, respectively, so as to be used for pivoting a shock absorber and a rear chain stay, respectively. In other embodiments, the swing arm joint 12, 22 can also be used to combine with a seat fork or a swing member pivotally connected to the rear triangle.

[0058] In addition, preferably, in order to ensure that the seat post can be correctly installed on the bicycle frame, the annular support member 30 can be provided with at least one groove at the top of the annular support member 30 before connecting the two shell members 10 and 20, after completing the joining step S3, or after the front triangle (head tube, upper tube, down tube, seat tube) is completed, and the top of the annular support member 30 and the groove protrude from the two shell members 10 and 20. In this way, the groove provides elasticity, which facilitates the insertion of the seat post, thereby improving the assembly efficiency. The length of the annular support member 30 is recommended to be more than 120 millimeters (mm) to effectively fix the seat post.

[0059] Preferably, in this preferred embodiment, the difference between the inner diameter of the cylinder formed by the first portion 101 of the two shells 10, 20 and the outer diameter of the cylinder of the annular support member 30 is about 0.5 mm. The gap G is about 0.5 to 2 mm, including the end value. In order to fix the seat post and the annular support member 30, the gap G in this numerical range can enable the bonding material to effectively fix the two shells 10, 20 and the annular support member 30 together.

[0060] The number and position of the swing arm joints 12 and 22 can be changed according to the actual vehicle model requirements, for example, Figure 6 In the second preferred embodiment shown in FIG. 1 , each of the shells 10A is only formed with a swing arm joint portion 12A protruding backwards at the third portion 103A; Figure 7 In the third preferred embodiment shown, each shell 10B is formed with a swing arm joint 12B protruding forward on the second portion 102B, and a swing arm joint 12B is respectively provided on the front and rear sides of the third portion 103B, and there are three swing arm joints 12B in total.

[0061] Specifically, in the shell forming step S1, the swing arm joint 12, 12A, 12B is formed by using a mold to form a plate on the two shells 10, 10A, 10B, 20, and the swing arm joint 12, 12A, 12B protrudes from the shells 10, 10A, 10B, 20 in a direction perpendicular to the joining direction D. After the joining step S3 is completed, a pivot hole 121, 221 is formed on the swing arm joint 12, 12A, 12B and passes through the shell along the joining direction D. The swing arm joints 12, 12A, 12B of the two shells 10, 10A, 10B, 20 are symmetrically arranged. This process cannot be realized by the existing metal stamping die technology or the existing thermoplastic composite material hot pressing forming technology, and is described.

[0062] Please refer to Figure 8As shown, the difference between the fourth preferred embodiment of the present invention and the third preferred embodiment is that the frame unit 100C includes a vertical tube portion 40C and a motor seat portion 50C which are connected to each other, and the motor seat portion 50C is used to combine with a mid-drive motor of an electric bicycle, wherein each of the shell components 10C, 20C respectively includes a motor seat section 105C, 205C which is integrally connected to the third portion 103C, 203C. In other words, each of the shell components 10C, 20C includes a structure of the vertical tube portion 40C and the left half or the right half of the motor seat portion 50C, and is integrally formed in the shell component molding step S1, so that the frame unit 100C formed after the two shell components 10C, 20C are joined includes the vertical tube portion 40C and the motor seat portion 50C.

[0063] Furthermore, the two motor base sections 105C and 205C can be formed by die design or further stamping and stretching when stamping the metal plate, which still has an improvement in efficiency compared to welding the independently manufactured motor base to each other.

[0064] Please refer to Fig. 9 As shown, the difference between the fifth preferred embodiment of the present invention and the first preferred embodiment is that: the two shells 10D and 20D of the frame unit 100D respectively include a connected upper tube connecting section 101D and 201D and a shock absorber accommodating section 102D and 202D, the two upper tube connecting sections 101D and 201D cover the annular support member 30D and are mutually connected, and the swing arm joint portion 12D is formed at the rear side of the shock absorber accommodating section 102D and 202D. The front side of the frame unit 100D is provided with the operation port 104D, and the operation port 104D is formed by the two shells 10D and 20D. In detail, an opening is formed on the front side of the shock absorber accommodating section 102D, 202D of each shell component 10D, 20D, and the two openings together form the operating port 104D. The two openings can be directly formed on the two shell components 10D, 20D in the shell component forming step S1, or can be formed on the frame unit 100D after the joining step S3 is completed, and the frame unit 100D is equipped with a cover plate 601, which is detachably connected to the operating port 104D.

[0065] When the frame unit 100D forms a bicycle frame, Fig.10As shown, the two shock absorber accommodating sections 102D and 202D are connected to a motor seat 106D, and are connected to a lower tube 107D through the motor seat 106D. The upper tube connecting sections 101D and 201D are connected to an upper tube 108D, and are connected to a head tube 109D through the upper tube 108D. The upper tube 108D and the head tube 109D are connected to the lower tube 107D, so that the bicycle frame is a hidden shock-absorbing frame, and a shock absorber 60 can be accommodated in the shock absorber accommodating sections 102D and 202D of the frame unit 100D, and the user can open the cover 601 and inspect and maintain the shock absorber 60 through the operation port 104D.

[0066] Please refer to Fig.11 As shown, the difference between the fifth preferred embodiment of the present invention and the first preferred embodiment is that the frame unit 100E is composed of a head pipe portion, a lower pipe portion and a motor seat portion, and the two shell components 10E and 20E are respectively formed with a head pipe section 101E and 201E, a lower pipe section 102E and 202E and a motor seat section 103E and 203E that are integrally connected, and the head pipe sections 101E and 201E of the two shell components 10E and 20E are internally connected with at least one of the annular support components 30E, and the annular support component 30E is used to connect a front fork top rod (external column).

[0067] Please refer to Figures 12 to 15 As shown, the difference between the sixth preferred embodiment of the present invention and the first preferred embodiment is that the frame unit 100F is composed of a head tube portion and an upper tube portion, and the two shells 10F and 20F are respectively formed with a head tube section 101F, 201F and an upper tube section 102F, 202F connected in an integral manner, and the head tube sections 101F, 201F of the two shells 10F and 20F are internally connected with two annular support members 30F, and the two annular support members 30F are used to connect a front fork top rod. In this preferred embodiment, the swing arm joints 12F and 22F are formed on the upper tube sections 102F and 202F, which can be as shown in FIG. Fig.16 As shown, a shock absorber 70 is provided.

[0068] Furthermore, the two annular support members 30F are respectively combined with the top and bottom of the two end pipe sections 101F and 201F, and the gap G' is formed between the two shell members 10F and 20F. Moreover, when the two shell members 10F and 20F are joined to each other, the gap G' is filled with the joining material, and the two annular support members 30F are joined to the two shell members 10F and 20F at the same time. Among them, since the two annular support members 30F are short in length, the operator can take measures to reinforce the joining position of the two annular support members 30F and the two shell members 10F and 20F. For example, in the case of a metal frame, friction welding or the like can be used to extend between the two shell members 10F, 20F and the two annular support members 30F (the two annular support members 30F and the two shell members 10F, 20F can also be designed to form a gap G') so that the two annular support members 30F and the two shell members 10F, 20F can be firmly joined.

[0069] Please refer to Fig.16 As shown, the frame unit 100F of the sixth preferred embodiment of the present invention is joined with the frame unit 100A of the second preferred embodiment, and then joined with the lower pipe 107F and a motor seat 106F, so as to form a bicycle frame. In other words, the frame units of the aforementioned preferred embodiments can be used interchangeably to combine the two shells and at least one annular support member through a gap, so that the two shells and the at least one annular support member are simultaneously joined with the joining material, while maintaining high production efficiency, ensuring the accuracy of bicycle assembly and the structural strength of the product.

[0070] Please refer to Fig.17 As shown, the difference between the seventh preferred embodiment of the present invention and the sixth preferred embodiment is that the frame unit 100G only includes one annular support member 30G, and the annular support member 30G is a bushing, and its length is the same as the height of the head pipe sections 101G and 201G of the two shell members 10G and 20G. In this way, the length of the gap formed between the two shell members 10G and 20G overlapping with the annular support member 30G is large, so that when the bonding material fills the gap, it is sufficient to firmly bond the annular support member 30G without the need for additional processing.

[0071] The above description is only a preferred embodiment of the present invention and is not a limitation of the present invention in any form. Any person with ordinary knowledge in the technical field can make equivalent embodiments by partial changes or modifications to the technical contents disclosed in the present invention without departing from the scope of the technical solution of the present invention, and they are still within the scope of the technical solution of the present invention without departing from the technical solution of the present invention.

Claims

1. A frame unit, characterized in that: Used to form a bicycle frame, the frame unit comprises: Two shells, the two shells are joined to each other along a joining direction, and the two shells are substantially symmetrical to each other; At least one annular support member, the annular support member is combined between the two shell members, and a combination hole is provided in the annular support member, and the combination hole is configured to match the outer contour of an outer column; The frame unit forms at least one gap between the two shells and the annular support member, and the gap is filled with a bonding material.

2. The frame unit according to claim 1, characterized in that The gap is formed between the two shells when the two shells are respectively against the annular support; or is formed between the annular support and the shell when the annular support is located between the two shells.

3. The frame unit according to claim 2, characterized in that: The bonding material is at least one of solder, a molten portion on the annular support member, and a molten portion on the shell member.

4. The frame unit according to any one of claims 1 to 3, characterized in that: Each of the shells includes at least one swing arm joint portion, which protrudes from the shell along a direction perpendicular to the joint direction and is provided with a pivot hole penetrating the shell along the joint direction. The swing arm joint portions of the two shells are symmetrically arranged.

5. The frame unit according to claim 4, characterized in that: The swing arm joint is used for pivotally connecting a shock absorber, a seat fork or a chain fork.

6. The frame unit according to any one of claims 1 to 3, characterized in that: The frame unit includes an operation port, which communicates the inner and outer sides of the two shells, and the operation port is arranged through one of the shells or is formed by the two shells.

7. A method for manufacturing a bicycle frame unit, characterized in that: The following steps are included: Shell forming step: forming two shells from the sheet material by a mold, so that the two shells are substantially symmetrical to each other and can be aligned with each other along a joining direction; Butt joint step: butt joint the two shells along the joint direction, and place an annular support member in the two shells, so that a gap is formed between the two shells and the annular support member; as well as Joining step: using a joining means to join the two shell parts to each other, and allowing the gap to be filled with a joining material, thereby forming a frame unit.

8. The method for manufacturing a bicycle frame unit according to claim 7, wherein: In the shell forming step, the two shells are formed by mold forming so that they each have at least one swing arm joint portion, and the swing arm joint portion protrudes from the shell along a direction perpendicular to the joining direction. After the joining step is completed, a pivot hole is formed on the swing arm joint portion and passes through the shell along the joining direction. The swing arm joint portions of the two shells are symmetrically arranged.

9. The method for manufacturing a bicycle frame unit according to claim 7, wherein: In the shell forming step, an operating port communicating the inner and outer sides of the shell is formed on the shell.

10. The method for manufacturing a bicycle frame unit according to claim 7, wherein: After the joining step is completed, an operating port is formed on the shell component to communicate with the inner and outer sides of the shell component.

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