Novel press-in type center shaft structure

Abstract

The utility model provides a novel press-in type center shaft structure which is characterized in that a center shaft bowl is arranged on the end portion of a center shaft in a sleeved mode, a through hole is formed in the center shaft bowl, an annular protrusion is arranged on the inner wall of the through hole and close to the center of the through hole, and a plurality of first arc-shaped grooves are evenly formed in the inner wall of the annular protrusion in the circumferential direction. The rotating assembly comprises an inner ring, annular fixing pieces and a plurality of rolling pieces, the inner ring is located in the annular protrusion, a plurality of second arc-shaped grooves are evenly formed in the outer wall of the inner ring in the axial direction, the two annular fixing pieces are located on the two sides of the inner ring respectively, and each rolling piece is arranged between the corresponding second arc-shaped groove and the corresponding first arc-shaped groove. According to the utility model, the structure of the original bearing and the structure of the end part of the middle shaft are integrated, so that the problem of matching between the bearing and the end part of the middle shaft is solved, the condition that the bearing and the middle shaft are not loosened after long-time riding is further ensured, and the service life of the bicycle is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle accessories, and particularly relates to a novel press-fit bottom bracket structure. Background Art

[0002] The bottom bracket of a bicycle is a rotating component installed in the bottom bracket shell of the frame for connecting the left and right cranks. At present, the installation efficiency of the bottom bracket on the market is low, the damping coefficient is large after installation, the rotational yaw is large, and the maintenance is inconvenient.

[0003] The existing patent (application number: CN201520223349.1) discloses a press-fit sealed bottom bracket, in which the bearings are fixed at both ends of the bottom bracket through snap rings, so that the rotational damping of the press-fit bottom bracket is reduced, the overall assembly quality is reduced, the overall assembly cost is reduced, the assembly efficiency is improved, and the sprocket positioning is accurate.

[0004] However, both this installation method and the traditional press-fit bottom bracket, that is, pressing the bearing onto the end of the bottom bracket and then pressing the bottom bracket with the bearing pressed in into the frame, have limitations. Specifically, to ensure the stability of the bearing in the cup, it is necessary to ensure an interference fit between the bearing and the cup. This leads to the situation that if the interference amount is too small, the bearing will loosen in the cup; if the interference amount is too large, the bearing will be stuck in the cup, which is likely to affect the stability of the bicycle during riding. Moreover, even if the fit between the bearing and the cup is good, loosening will still occur after a long time of riding, resulting in a significant reduction in the service life of the bicycle. Summary of the Utility Model

[0005] The utility model is made to solve the above problems, and its purpose is to provide a novel press-fit bottom bracket structure.

[0006] The utility model provides a novel press-fit bottom bracket structure, which has the following characteristics:

[0007] A bottom bracket cup, sleeved on the end of the bottom bracket, the bottom bracket cup is shaft-shaped, a through hole is provided inside the bottom bracket cup, the diameter of one end of the through hole is not greater than the diameter of the bottom bracket axle core, and a ring-shaped protrusion is provided on the inner wall of the through hole near its center. A plurality of first arc-shaped grooves are evenly arranged along the circumferential direction on the inner wall of the ring-shaped protrusion.

[0008] A rotating assembly, arranged in the through hole, the rotating assembly includes an inner ring, two ring-shaped fixing members and a plurality of rolling members. The inner ring is located inside the ring-shaped protrusion. A plurality of second arc-shaped grooves are evenly arranged along the axial direction on the outer wall of the inner ring. Each second arc-shaped groove corresponds to a first arc-shaped groove. One end of each ring-shaped fixing member is connected to the inner wall of the ring-shaped protrusion, and the other end is connected to the outer wall of the inner ring. The two ring-shaped fixing members are respectively located on both sides of the inner ring. Each rolling member is arranged between a second arc-shaped groove and the corresponding first arc-shaped groove.

[0009] In the new press - in type bottom bracket structure provided by the present utility model, it can also have the following feature: A plurality of limiting members are evenly arranged along the circumferential direction on the outer wall of the inner ring, and each limiting member is located on one side of a second arc - shaped groove, so as to limit the rolling elements.

[0010] In the new press - in type bottom bracket structure provided by the present utility model, it can also have the following feature: The annular fixing member is in the shape of an annular sheet, and the outer part of each annular fixing member is wrapped with a waterproof rubber layer.

[0011] In the new press - in type bottom bracket structure provided by the present utility model, it can also have the following feature: The rolling elements are balls.

[0012] In the new press - in type bottom bracket structure provided by the present utility model, it can also have the following feature: The edge of the hole opening at the other end of the through - hole is chamfered.

[0013] In the new press - in type bottom bracket structure provided by the present utility model, it can also have the following feature: An outer edge protrudes outwards towards the through - hole on the outer wall at the other end of the bottom bracket cup.

[0014] Functions and effects of the utility model

[0015] According to the new press - in type bottom bracket structure involved in the present utility model, by integrating the structure of the original bearing with the structure of the bottom bracket end, the problem of the fit between the bearing and the bottom bracket end is solved. Furthermore, it is ensured that the bearing and the bottom bracket will not become loose after a long - time ride, greatly improving the service life of the bicycle. Description of the drawings

[0016] Figure 1 is a cross - sectional view of the present utility model;

[0017] Figure 2 is Figure 1 a partial enlarged view of

[0018] Description of the reference numerals:

[0019] 1. Bottom bracket cup; 11. Through - hole; 12. Annular protrusion; 13. First arc - shaped groove; 2. Rotating assembly; 21. Inner ring; 22. Second arc - shaped groove; 23. Limiting member; 24. Annular fixing member; 25. Waterproof rubber layer; 26. Rolling element. Detailed implementation manners

[0020] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the following embodiments are specifically described with reference to the accompanying drawings for the present utility model.

[0021] Embodiment

[0022] Figure 1 is a cross-sectional view of the present utility model, Figure 2 and Figure 1 is a partially enlarged view of

[0023] As shown in Figure 1 and Figure 2 This embodiment provides a new type of press-fit bottom bracket structure, including: a bottom bracket cup 1 and a rotating assembly 2.

[0024] In this embodiment, the bottom bracket cup 1 is sleeved on the end of the bottom bracket. The bottom bracket cup 1 is shaft-shaped. A through hole 11 is provided inside the bottom bracket cup 1. The diameter of one end of the through hole 11 is not greater than the diameter of the bottom bracket axle core. An annular protrusion 12 is provided on the inner wall of the through hole 11 and near its center. A plurality of first arc-shaped grooves 13 are evenly arranged along the circumferential direction on the inner wall of the annular protrusion 12. Among them, an outer edge protrudes outward from the outer wall of the other end of the bottom bracket cup 1 and towards the outside of the through hole 11. And, the edge of the hole opening at the other end of the through hole 11 is chamfered.

[0025] During use, after the bottom bracket cup 1 is arranged on the bottom bracket, the outer edge on the outer wall of its other end can block some water and dust from entering the inside of the bottom bracket cup 1. And, after the edge of the hole opening at the other end of the through hole 11 is chamfered, it can facilitate the connection between the crank and the bottom bracket, thereby improving the practical effect of the present utility model.

[0026] In this embodiment, the rotating assembly 2 is arranged inside the through hole 11. The rotating assembly 2 includes an inner ring 21, two annular fixing members 24, and a plurality of rolling members 26. The inner ring 21 is located inside the annular protrusion 12. A plurality of second arc-shaped grooves 22 are evenly arranged along the axial direction on the outer wall of the inner ring 21. Each second arc-shaped groove 22 corresponds to a first arc-shaped groove 13. One end of each annular fixing member 24 is connected to the inner wall of the annular protrusion 12, and the other end is connected to the outer wall of the inner ring 21. And the two annular fixing members 24 are respectively located on both sides of the inner ring 21. Each rolling member 26 is arranged between a second arc-shaped groove 22 and the corresponding first arc-shaped groove 13.

[0027] In this embodiment, a plurality of limiting members 23 are evenly arranged along the circumferential direction on the outer wall of the inner ring 21. Each limiting member 23 is located on one side of a second annular groove, so as to limit the rolling member 26. Among them, the limiting member 23 is preferably a cage used for limiting the rolling member 26 in the existing bearing technology.

[0028] In this embodiment, the annular fixing member 24 is annular and sheet-shaped, and a waterproof rubber layer 25 is wrapped on the outside of each annular fixing member 24.

[0029] In this embodiment, the rolling member 26 is preferably a ball.

[0030] During use, the rotating assembly 2 is directly disposed within the bottom bracket shell 1, integrating it with the bottom bracket shell 1, thereby avoiding the fitting problem between the rotating assembly 2 and the bottom bracket shell 1, and further ensuring that the bearing and the bottom bracket will not become loose after long-term cycling, greatly improving the service life of the bicycle. Among them, the limiting member 23 disposed between the inner ring 21 and the annular protrusion 12 can ensure that the plurality of rolling elements 26 roll between their corresponding first arc-shaped grooves 13 and second arc-shaped grooves 22, thus ensuring the stability of the present utility model during use. In addition, a ring-shaped fixing member 24 is provided on each side of the inner ring 21 and the annular protrusion 12, and a waterproof rubber layer 25 is wrapped around the outside of each ring-shaped fixing member 24, thereby further preventing water or dust from entering the rotating assembly 2, and further improving the stability of the present utility model during use.

[0031] Functions and effects of the embodiment

[0032] According to the novel press-fit bottom bracket structure of the present utility model, it aims to integrate the structure of the original bearing with the structure of the bottom bracket end, thereby solving the fitting problem between the bearing and the bottom bracket end, and further ensuring that the bearing and the bottom bracket will not become loose after long-term cycling, greatly improving the service life of the bicycle.

[0033] The above embodiments are preferred cases of the present utility model and are not used to limit the protection scope of the present utility model.

Claims

1. A new type of press-in middle shaft structure, characterized in that: include: A central shaft bowl is sleeved on the end of the central shaft, the central shaft bowl is shaft-shaped, a through hole is opened inside the central shaft bowl, the diameter of one end of the through hole is not greater than the diameter of the central shaft core, an annular protrusion is provided on the inner wall of the through hole and near the center thereof, and a plurality of first arc-shaped grooves are uniformly opened on the inner wall of the annular protrusion along the circumferential direction. A rotating assembly is arranged in the through hole, and the rotating assembly includes an inner ring, two annular fixing parts and a plurality of rolling parts. The inner ring is located inside the annular protrusion, and a plurality of second arc grooves are evenly opened on the outer wall of the inner ring along the axial direction. Each of the second arc grooves has a corresponding first arc groove. One end of each of the annular fixing parts is connected to the inner wall of the annular protrusion, and the other end is connected to the outer wall of the inner ring. The two annular fixing parts are respectively located on both sides of the inner ring, and each of the rolling parts is arranged between a second arc groove and the first arc groove corresponding thereto.

2. The novel press-in type center shaft structure according to claim 1 is characterized in that: in, The outer wall of the inner ring is evenly provided with a plurality of limiting members along the circumferential direction, and each of the limiting members is located at one side of one of the second arc-shaped grooves, so as to limit the rolling member.

3. The novel press-in type center shaft structure according to claim 1 is characterized in that: in, The annular fixing member is in the shape of an annular sheet, and the outside of each annular fixing member is wrapped with a waterproof rubber layer.

4. The novel press-in type center shaft structure according to claim 1 is characterized in that: in, The rolling element is a ball.

5. The novel press-in type center shaft structure according to claim 1 is characterized in that: in, The hole edge at the other end of the through hole is chamfered.

6. The novel press-in type center shaft structure according to claim 1 is characterized in that: in, An outer edge is provided on the outer wall of the other end of the central shaft bowl and protrudes outwardly from the through hole.

Images