Lightweight riveting crankset square sleeve, crankset assembly and square sleeve forming die
Through the combined connection method of riveting head and clamping, the problems of unstable fixing and difficult processing of square sleeves and discs are solved, and lightweight, stable and reliable connection effect is achieved.
Patent Information
- Application Number
- CN202321161249.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-05-15
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2033-05-15
AI Technical Summary
In the prior art, the fixing method of the square sleeve and the tooth plate is prone to brittle breakage or fatigue damage during welding, and the spline boss limiting method is difficult and costly.
The square sleeve and the tooth disc are connected by riveting. By providing a riveting head in the square sleeve, the riveting head passes through the shaft hole of the tooth disc for fixing, and clamping it with the central shaft through the clamp pin to achieve stable connection.
It achieves stable and reliable connections, reduces the difficulty of materials and processing, improves toughness and plasticity, and reduces processing costs.
Smart Images
Figure CN223148618U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bicycles, and particularly relates to a lightweight riveted square sleeve for a chainring, a chainring assembly and a square sleeve forming die. Background Art
[0002] The fixing methods of the square sleeve and the chainring generally adopt two methods: welding and spline boss limiting. Although the welding method can save materials and is simple to operate, the chainring itself is thin, with large welding residual stress and deformation. It is easy to cause damage to the chainring itself during welding, and the toughness and plasticity of welding are poor, prone to brittle fracture or fatigue failure, and the service life is short. The spline boss limiting method is more reliable and stable than welding and has a long service life, but it uses more materials, has a large processing difficulty, a long processing time, and a large increase in processing cost. Content of the Utility Model
[0003] In order to solve the problems that the square sleeve and the chainring are prone to brittle fracture or fatigue failure when welded, and the processing difficulty and cost are high when using spline boss limiting, the utility model provides a lightweight riveted square sleeve for a chainring, a chainring assembly and a square sleeve forming die. When connecting the square sleeve and the chainring, riveting is adopted, the connection is stable and reliable, and at the same time, the structure of the riveting head itself is simple, the volume is small, the material consumption is small, and the processing difficulty is low.
[0004] The technical solution adopted by the utility model is to provide a lightweight riveted square sleeve for a chainring. The square sleeve includes a seat body with a shaft hole and a pin hole. The seat body has a box structure with an open inner end. The shaft hole is arranged at the outer end of the seat body, the pin hole is arranged on the side wall of the seat body, and a riveting head is arranged at the inner end of the seat body.
[0005] At least two riveting heads are arranged, and are symmetrically arranged on the end faces of the opposite side walls at the open end of the seat body respectively.
[0006] The upper and lower ends of the seat body are arc surfaces, and the front and rear ends and the side walls are all planes. The riveting heads are respectively arranged on the side wall end faces of the seat body with shaft holes.
[0007] The outer and inner walls of the side walls of the two end faces of the riveting head and the seat body are in the same plane.
[0008] The riveting head is in a crescent structure or a plate structure or a columnar structure.
[0009] A groove is arranged on the outer end face of the seat body, and the shaft hole is arranged in the groove.
[0010] The present utility model also provides a lightweight riveted chainring assembly, including the square sleeve, a chainring with a central hole and coaxially arranged with the square sleeve, a central shaft inserted through the shaft hole and the central hole, a retaining pin arranged in the pin hole of the square sleeve, and a riveting through hole arranged on the chainring corresponding to the riveting head. The square sleeve is riveted to the chainring by the riveting head passing through the riveting through hole, and the central shaft is clamped to the square sleeve by inserting the retaining pin into the pin hole.
[0011] The present utility model also provides a forming die for a lightweight riveted chainring square sleeve, which is used for forming the square sleeve.
[0012] The beneficial effects of the present utility model are as follows: a lightweight riveted chainring square sleeve, a chainring assembly and a forming die for the square sleeve are provided. The square sleeve adopts a square sleeve with a box structure, which greatly reduces the self-weight of the processing materials and the processing difficulty of the square sleeve. A riveting head is added at the inner end of the square sleeve, and the square sleeve and the chainring are fixed by riveting, so that the toughness and plasticity are significantly improved, and the connection is more stable and reliable. At the same time, the structure of the riveting head itself is simple, the volume is small, the processing difficulty is low, and the material consumption is small. Description of the Drawings
[0013] Figure 1 It is a schematic cross-sectional structure diagram of the square sleeve;
[0014] Figure 2 It is a schematic inner end structure diagram of the square sleeve;
[0015] Figure 3 It is a schematic connection structure diagram of the square sleeve, the chainring and the central shaft;
[0016] Figure 4 It is a schematic riveting structure diagram of the square sleeve and the chainring.
[0017] In the drawings, 1, shaft hole; 2, pin hole; 3, seat body; 4, riveting head; 5, square sleeve; 6, chainring; 7, central shaft; 8, retaining pin; 9, groove. Detailed Embodiments
[0018] Such as Figure 1-2As shown in the figure, the present utility model provides a lightweight riveted chainring square sleeve. The square sleeve 5 includes a seat body 3 with a shaft hole 1 and a pin hole 2. The seat body 3 is in the structure of a box body with an open inner end. The shaft hole 1 is arranged at the outer end of the seat body 3, and the pin hole 2 is arranged on the side wall of the seat body 3. A riveting head 4 is arranged at the inner end of the seat body 3. The square sleeve 5 is a cold-heading integral forming structure, and the seat body 3 is a box body structure with one end open and hollow inside, reducing the production material consumption and the self-weight. At the same time, due to the thin wall, the cold-heading forming is fast, and the number of cold-heading times required during forming is greatly reduced. By adding a riveting head 4 at the inner end of the seat body 3, when connecting the seat body 3 with the chainring 6, it is riveted and fixed by passing the riveting head 4 through the shaft hole of the chainring 6. The connection is more stable and reliable, with high toughness and plasticity, small deformation, and less material consumption. At least one riveting head 4 can be arranged, and it can be arbitrarily arranged on the side wall end face at the inner end of the seat body 3. It can not only play the role of riveting, but also form a relative limit with the chainring 6 to prevent rotation. The riveting head 4 and the seat body 3 are cold-heading integral formed, which is convenient for processing, and has better integrity and higher strength.
[0019] As Figure 1-2 shown, at least two riveting heads 4 are arranged, and are symmetrically arranged on the end faces of the opposite side walls at the open end of the seat body 3 respectively. Arranging two symmetric riveting heads 4 can further improve the connection strength between the square sleeve 5 and the chainring 6, and the connection is more stable and reliable.
[0020] As Figure 1-2 shown, the upper and lower ends of the seat body 3 are arc-shaped, and the front, rear ends and side walls are all flat. The riveting heads 4 are respectively arranged on the side wall end faces of the seat body 3 with the shaft hole 1. The square sleeve 5 is cold-heading integral formed. Arranging the riveting heads 4 on the flat surface can reduce the processing difficulty and the processing difficulty of the corresponding mold, which is convenient for processing and saves costs.
[0021] As Figure 1-2 shown, the outer side end faces of the two sides of the riveting head 4 are in the same plane as the outer wall and the inner wall of the side wall of the seat body 3. It can reduce the processing difficulty and the structural complexity of the cold-heading mold, and the processing is more convenient.
[0022] As Figure 2 shown, the riveting head 4 is in the shape of a crescent structure or a straight plate structure or a columnar structure. The riveting head 4 with this structure has a simple structure, a small volume, less required materials, and a low processing difficulty.
[0023] As Figure 1 shown, a groove 9 is arranged on the outer side end face of the seat body 3, and the shaft hole 1 is arranged in the groove 9. The outer end of the seat body 3 is in the shape of a groove, and the groove bottom is flat, further reducing the processing material consumption and the processing difficulty.
[0024] As Figure 3-4As shown in the figure, the present utility model also provides a lightweight riveted chainring assembly, which includes a square sleeve 5, a chainring 6 with a central hole and coaxially arranged with the square sleeve 5, a bottom bracket spindle 7 inserted through the shaft hole 1 and the central hole, a retaining pin 8 arranged in the pin hole 2 of the square sleeve 5, and a riveting through-hole corresponding to the riveting head 4 arranged on the chainring 6. The square sleeve 5 is riveted to the chainring 6 by means of the riveting head 4 passing through the riveting through-hole, and the bottom bracket spindle 7 is clamped to the square sleeve 5 by means of the retaining pin 8 inserted into the pin hole 2.
[0025] The square sleeve 5 adopts a box structure. After the riveting head 4 passes through the riveting through-hole 9 on the chainring 6, the square sleeve 5 is press-riveted to achieve riveting and fixing. A retaining pin 8 is used for clamping and fixing between the square sleeve 5 and the bottom bracket spindle 7. The riveting is used to replace the traditional fixing methods of welding and spline boss limiting, with more stable and reliable connection, high toughness and plasticity, less material consumption, and convenient processing.
[0026] As Figure 1-2 shown in the figure, the present utility model also provides a forming die for a lightweight riveted chainring square sleeve, which is used for the forming die of the square sleeve 5. The square sleeve 5 is cold-formed by a cold heading die.
Claims
1. A lightweight riveted chainring square sleeve, the square sleeve (5) comprising a seat body (3) with a shaft hole (1) and a pin hole (2), characterized in that: The seat body (3) has a box structure with an open inner end. The shaft hole (1) is provided at the outer end of the seat body (3), the pin hole (2) is provided on the side wall of the seat body (3), a riveting head (4) is provided at the inner end of the seat body (3), and the square sleeve (5) is an integral structure.
2. The lightweight riveted chainring square sleeve according to claim 1, wherein: There are at least two riveting heads (4), which are symmetrically arranged on the end faces of the opposite side walls at the open end of the seat body (3) respectively.
3. The lightweight riveted chainring square sleeve according to claim 2, wherein: The upper and lower ends of the seat body (3) are arc-shaped surfaces, and the front, rear ends and side walls are all flat surfaces. The riveting heads (4) are respectively arranged on the side wall end faces of the seat body (3) with the shaft hole (1).
4. The lightweight riveted chainring square sleeve according to claim 2, wherein: The outer and inner walls of the side walls of the two end faces of the riveting head (4) and the seat body (3) are in the same plane.
5. The lightweight riveted chainring square sleeve according to claim 1, characterized in that: The riveting head (4) has a crescent-shaped structure, a straight plate-shaped structure or a columnar structure.
6. The lightweight riveted chainring square sleeve according to claim 1, wherein: A groove (9) is provided on the outer end face of the seat body (3), and the shaft hole (1) is provided in the groove (9).
7. A lightweight riveted chainring assembly, characterized in that: It includes a square sleeve (5) according to any one of claims 1-6, a sprocket (6) with a central hole and coaxially arranged with the square sleeve (5), a central shaft (7) inserted through the shaft hole (1) and the central hole, a retaining pin (8) arranged in the pin hole (2) of the square sleeve (5), and a riveting through hole arranged on the sprocket (6) and corresponding to the riveting head (4). The square sleeve (5) is riveted to the sprocket (6) by passing through the riveting through hole with the riveting head (4), and the central shaft (7) is clamped to the square sleeve (5) by inserting into the pin hole (2) with the retaining pin (8).
8. A lightweight riveting square sleeve forming die, characterized in that: A forming die for the square sleeve (5) according to any one of claims 1-6.