Mounting structure for center shaft of sports bicycle

Abstract

The utility model discloses a sports bicycle center shaft mounting structure which comprises a shell (1), the outer surface of the shell (1) is fixedly connected into a frame structural part, a mounting hole (8) with a circular section is formed in the shell (1), and a plurality of sets of evenly-distributed positioning grooves (2) are formed in the outer side of one end of the mounting hole (8). The sleeve (3) is arranged in the mounting hole (8) of the shell (1), the length of the sleeve (3) is larger than that of the shell (1), a positioning locking piece (4) corresponding to the positioning groove (2) is arranged on the outer side of one end of the sleeve (3), and a locking mechanism for locking the sleeve (3) in the shell (1) is arranged at the other end of the sleeve (3); and the middle shaft (5) is arranged in the sleeve (3) through a bearing (6) and is coaxial with the sleeve (3). The device has the advantages of being convenient to install and not prone to damage.

Description

Technical Field

[0001] This utility model relates to a central axis mounting structure, and more particularly to a central axis mounting structure for a sports bicycle. Background Technology

[0002] The bottom bracket is one of the main components of a bicycle's drive system. It's housed in the bottom bracket sleeve of the bicycle frame. Cranks connecting the bicycle pedals are mounted at both ends of the bottom bracket. The bottom bracket transmits the force applied by the rider to the pedals to the sprocket, which then drives the wheels forward. During installation, it's crucial to ensure good coaxiality between the bottom bracket and the bottom bracket tube. Otherwise, it can lead to increased load during riding, accelerated wear, and a shortened lifespan. Therefore, installation is relatively complicated, requiring careful attention to ensure good coaxiality between the bottom bracket and the bottom bracket tube, resulting in inconvenient and inefficient installation. Utility Model Content

[0003] The purpose of this invention is to provide a bottom bracket mounting structure for a cycling bicycle. It has the advantages of easy installation and low risk of damage.

[0004] The technical solution of this utility model: a bottom bracket mounting structure for a sports bicycle, comprising:

[0005] The outer shell is fixedly connected to the frame structure. The outer shell has a circular mounting hole inside, and multiple evenly distributed positioning grooves are provided on the outer side of one end of the mounting hole.

[0006] The sleeve is located in the mounting hole of the outer shell and its length is greater than that of the outer shell. One end of the sleeve is provided with a positioning locking piece corresponding to the positioning groove, and the other end is provided with a locking mechanism to lock the sleeve in the outer shell.

[0007] The central shaft is housed within the sleeve via bearings and is coaxially mounted with the sleeve.

[0008] In the aforementioned bicycle bottom bracket mounting structure, the locking mechanism includes an external thread at the end of the sleeve, and a nut that can rotate relative to the external thread is provided outside the external thread. When the positioning locking piece of the sleeve is engaged with the positioning groove, the nut is in contact with the end face of the outer shell.

[0009] In the aforementioned bicycle bottom bracket mounting structure, the nut is provided with multiple sets of evenly distributed and axially arranged screw holes, and anti-loosening screws are provided in the screw holes to achieve pressure locking of the nut.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] This application fixes the central shaft relative to the sleeve, ensuring that the central shaft and the sleeve supporting the central shaft always have good coaxiality. During installation, one end of the sleeve is positioned and installed by the cooperation of the positioning locking piece and the positioning groove, while the other end is locked by the locking mechanism, making installation quick and effective. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the structure of the sleeve of this utility model;

[0014] Figure 3 This is a schematic diagram of the structure of the outer shell of this utility model;

[0015] Figure 4 This is a schematic diagram of the structure of the nut of this utility model;

[0016] Figure 5 This is a schematic diagram of the structure of the bearing of this utility model;

[0017] Figure 6 This is a structural schematic diagram of the anti-loosening screw of this utility model;

[0018] Figure 7 This is a schematic diagram of the structure of the central axis of this utility model.

[0019] The markings in the attached diagram are: 1-outer shell, 2-positioning groove, 3-sleeve, 4-positioning locking piece, 5-central shaft, 6-bearing, 7-nut, 8-mounting hole, 10-anti-loosening screw, 11-screw hole. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0021] Example. A bottom bracket mounting structure for a sports bicycle, configured as follows: Figure 1-7 As shown, it includes:

[0022] The outer shell 1 is fixedly connected to the frame structure. The outer shell 1 has a circular mounting hole 8 inside, and a plurality of evenly distributed positioning grooves 2 are provided on the outer side of one end of the mounting hole 8.

[0023] The sleeve 3 is located in the mounting hole 8 of the outer shell 1 and its length is greater than that of the outer shell 1. One end of the sleeve is provided with a positioning locking piece 4 corresponding to the positioning groove 2, and the other end is provided with a locking mechanism to lock the sleeve 3 in the outer shell 1.

[0024] The central shaft 5 is housed within the sleeve 3 via the bearing 6 and is coaxially arranged with the sleeve 3.

[0025] The locking mechanism includes an external thread at the end of the sleeve 3, and a nut 7 that can rotate relative to the external thread is provided outside the external thread. When the positioning locking piece 4 of the sleeve 3 is engaged with the positioning groove 2, the nut 7 is in contact with the end face of the outer shell 1.

[0026] The nut 7 is provided with multiple sets of evenly distributed and axially arranged screw holes 11.

[0027] The nut 7 is provided with multiple sets of evenly distributed and axially arranged screw holes 11, and anti-loosening screws 10 are provided in the screw holes 11 to achieve pressure locking of the nut 7.

[0028] The principle of this utility model is as follows: First, a shell 1 is welded into the original frame structure used for mounting the bottom bracket. The shell 1 is fixedly connected to the frame and is a cylindrical shell with an internal mounting hole 8. One end of the mounting hole 8 has a positioning groove 2. The bottom bracket 5 is placed inside the sleeve 3 via a bearing 6. When the bottom bracket 5 is installed, the sleeve 3 is inserted into the shell from the positioning groove 2 end of the shell 1. Since the sleeve length is greater than the shell length, after the positioning locking piece 4 is fully engaged with the positioning groove 2, the other end of the sleeve will protrude from the shell 1. The exposed part of the sleeve 3 has external threads. By setting a nut 7 corresponding to the external threads, the sleeve 3 is locked during the rotation of the nut 7. During the installation process, the coaxiality between the bottom bracket 5 and the sleeve 3 will not change. The installation process will not affect the coaxiality between the bottom bracket 5 and the sleeve 3 supporting the bottom bracket 5. Therefore, the bottom bracket 5 experiences less wear and is less prone to damage during rotation. Finally, the anti-loosening screw 10 is installed in the screw hole 11 to achieve pressure locking, so that the nut 7 cannot rotate relative to the external thread section of the sleeve 3, and the locking effect is good.

Claims

1. A bottom bracket mounting structure for a sports bicycle, characterized in that, include: The outer shell (1) is fixedly connected to the frame structure. The outer shell (1) has a circular mounting hole (8) inside, and a number of evenly distributed positioning grooves (2) are provided on the outer side of one end of the mounting hole (8). The sleeve (3) is located in the mounting hole (8) of the outer shell (1) and its length is greater than that of the outer shell (1). One end of the sleeve is provided with a positioning locking piece (4) corresponding to the positioning groove (2), and the other end is provided with a locking mechanism to lock the sleeve (3) in the outer shell (1). The central shaft (5) is located inside the sleeve (3) via a bearing (6) and is coaxial with the sleeve (3).

2. The bicycle bottom bracket mounting structure according to claim 1, characterized in that: The locking mechanism includes an external thread at the end of the sleeve (3), and a nut (7) that can rotate relative to the external thread is provided outside the external thread. When the positioning locking piece (4) of the sleeve (3) is engaged with the positioning groove (2), the nut (7) is in contact with the end face of the outer shell (1).

3. The bicycle bottom bracket mounting structure according to claim 2, characterized in that: The nut (7) is provided with multiple sets of evenly distributed and axially arranged screw holes (11), and anti-loosening screws (10) are provided in the screw holes (11) to achieve pressure locking of the nut (7).

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