Waterproof assembly for connecting middle shaft and crank
By designing a waterproof component at the connection between the bottom bracket and the crank, and utilizing waterproof parts on the bottom bracket cup and bearing side, the waterproofing problem at the connection between the bottom bracket and the crank is solved, achieving the maintenance of sealing and lubrication, and extending service life.
Patent Information
- Application Number
- CN202423125763.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-18
AI Technical Summary
The existing bottom bracket and crank connection is prone to moisture entering during rain or washing, leading to lubrication failure and rust, which affects the riding experience.
A waterproof assembly was designed, including a central bearing cup, a bearing, and a waterproof component. Water and dust are blocked by a second waterproof component inside the central bearing cup and a first waterproof component on the side of the bearing, ensuring the seal at the connection.
It effectively prevents water and dust from entering the connection between the bottom bracket and the crank, maintains lubrication, extends service life, and enhances the riding experience.
Smart Images
Figure CN223494695U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bicycle accessories technology, specifically to a waterproof component for connecting the bottom bracket and the crank. Background Technology
[0002] A bicycle, also known as a pedal bike or bicycle, is a vehicle that uses pedals to power its wheels. It is a green and environmentally friendly means of transportation. It mainly consists of a frame, transmission, running gear, and safety devices. Among the various parts of a bicycle, apart from some small bearings, there are three main types of bearings: the front axle, the bottom bracket, and the rear axle. The front and rear axles only need to withstand bending moments and do not rotate, making them fixed axles. The bottom bracket, on the other hand, withstands both bending moments and torque, making it a rotating axle. The bottom bracket is the axle used to connect the pedals to the crank. Therefore, the quality of the bottom bracket affects the rider's pedaling experience.
[0003] While commonly used bottom brackets offer some waterproof and dustproof performance, water can still seep into the connection between the bottom bracket and crankshaft when riding in the rain or washing the vehicle. This can affect lubrication and cause rust, leading to abnormal noises during riding. Therefore, existing technology has limitations. Utility Model Content
[0004] This invention was developed to solve the above-mentioned problems, and its purpose is to provide a waterproof component for connecting the bottom shaft and the crank.
[0005] This utility model provides a waterproof component for connecting the bottom bracket and the crank, disposed on the bottom bracket and located at the connection between the bottom bracket and the crank. It features a bottom bracket cup, fitted onto the bottom bracket, the bottom bracket cup being a hollow stepped shaft shape, including a small-diameter section and a large-diameter section. The connection between the large-diameter section and the small-diameter section has a positioning step. At least a portion of the small-diameter section is in contact with the outer wall of the bottom bracket, and the diameter of the large-diameter section is larger than the diameter of the bottom bracket.
[0006] The bearing is fitted onto the central shaft, located inside the large-diameter section of the central shaft cup, and abuts against the positioning step. A first waterproof component is provided on both end faces of the bearing.
[0007] The second waterproof component is fitted onto the central shaft and located inside the large-diameter section of the central shaft cup. The thickness of the second waterproof component is not less than the distance between the bearing and the crank. The first waterproof component has a fixing part and a waterproof part. One end of the fixing part abuts against the bearing. The waterproof part is provided on the fixing part and covers the bottom end, the other end, and the top end of the fixing part. The bottom end of the waterproof part fits against the outer wall of the central shaft. The side end of the waterproof part abuts against the crank. The diameter of the waterproof part is not less than the diameter of the large-diameter section.
[0008] The waterproof assembly for connecting the central shaft and crank provided by this utility model also has the following features: the fixing part is made of metal, and the waterproof part is made of rubber.
[0009] The waterproof assembly for connecting the central shaft and the crank provided by this utility model also has the following features: the first waterproof component is in the shape of a waterproof cap, and the second waterproof component is in the shape of a waterproof gasket.
[0010] The waterproof assembly for connecting the central shaft and crank provided by this utility model also has the following feature: the bearing is a ball bearing.
[0011] Functions and effects of utility models
[0012] The waterproof assembly for connecting the bottom bracket and crank according to this utility model aims to prevent water or dust from entering the bottom bracket cup by using a second waterproof component inside the bottom bracket cup and a first waterproof component on the bearing side end, thereby preventing water or dust from entering the connection between the bottom bracket and crank, ensuring lubrication inside the connection between the bottom bracket and crank, extending the service life of the bottom bracket and crank, and thus ensuring the practical effect of this utility model. Attached Figure Description
[0013] Figure 1 This is a cross-sectional view of the present invention and part of the central shaft and part of the crank.
[0014] Figure 2 yes Figure 1 Enlarged view of point A in the image.
[0015] Explanation of reference numerals in the attached figures:
[0016] 1. Bottom shaft; 2. Crank; 3. Bottom shaft cup; 31. Small diameter section; 32. Large diameter section; 4. Bearing; 5. First waterproof component; 51. Fitting part; 52. Reinforcing part; 6. Second waterproof component; 61. Fixing part; 62. Waterproof part. Detailed Implementation
[0017] To make the technical means, creative features, objectives and effects of this utility model easy to understand, the following embodiments are described in detail with reference to the accompanying drawings.
[0018] Example
[0019] Figure 1 This is a cross-sectional view of the present invention and part of the central shaft and part of the crank. Figure 2 yes Figure 1 Enlarged view of point A in the image.
[0020] like Figure 1 and Figure 2As shown, this embodiment provides a waterproof assembly for connecting the bottom bracket and the crank, which is disposed on the bottom bracket 1 and located at the connection between the bottom bracket 1 and the crank 2, including: bottom bracket cup 3, bearing 4, and second waterproof component 6.
[0021] like Figure 1 and Figure 2 As shown, the central bearing cup 3 is fitted onto the central bearing 1. The central bearing cup 3 is a hollow stepped shaft shape, including a small diameter section 31 and a large diameter section 32. A positioning step is provided at the connection between the large diameter section 32 and the small diameter section 31. At least a portion of the small diameter section 31 is in contact with the outer wall of the central bearing 1. Specifically, the small diameter section 31 of the central bearing cup 3 can be completely in contact with the outer wall of the central bearing 1, while also allowing only a portion of the small diameter section 31 to be in contact with the outer wall of the central bearing 1 to reduce friction. This serves to prevent dust and debris from entering the interior of the large diameter section 32 of the central bearing cup 3, thereby preventing dust and / or water from entering the interior of the connection between the central bearing 1 and the crank 2. The diameter of the large diameter section 32 is larger than the diameter of the central bearing 1. However, the diameter of the small diameter section 31 of the central bearing cup 3 is not larger than the diameter of the central bearing 1.
[0022] like Figure 1 and Figure 2 As shown, the bearing 4 is sleeved on the central shaft 1, located inside the large diameter section 32 of the central shaft cup 3, and abuts against the positioning step. A first waterproof component 5 is provided on both end faces of the bearing 4. Preferably, the bearing 4 is a ball bearing 4.
[0023] In this embodiment, the first waterproof component 5 is preferably in the form of a waterproof cap. The first waterproof component 5 may have a fitting part 51 made of rubber and a reinforcing part 52 made of aluminum alloy. The fitting part 51 is engaged with the bearing 4, and the reinforcing part 52 is disposed inside the fitting part 51 and abuts against the side end face of the bearing 4. This can prevent foreign matter from entering the bearing 4, extend the service life of the bearing 4, and also prevent foreign matter from entering the interior of the connection between the central shaft 1 and the crank 2.
[0024] like Figure 1 and Figure 2 As shown, the second waterproof component 6 is fitted onto the central shaft 1 and located inside the large-diameter section 32 of the central shaft cup 3. The thickness of the second waterproof component 6 is not less than the distance between the bearing 4 and the crank 2. The first waterproof component 5 has a fixing part 61 and a waterproof part 62. One end of the fixing part 61 abuts against the bearing 4. The waterproof part 62 is provided on the fixing part 61 and covers the bottom end, the other end, and the top end of the fixing part 61. The bottom end of the waterproof part 62 fits against the outer wall of the central shaft 1, and the side end of the waterproof part 62 abuts against the crank 2. The diameter of the waterproof part 62 is not less than the diameter of the large-diameter section 32. Preferably, the thickness of the second waterproof component 6 is greater than the distance between the bearing 4 and the crank 2, and the diameter of the waterproof part 62 is preferably greater than the diameter of the large-diameter section 32 of the central shaft cup 3.
[0025] In this embodiment, the second waterproof component 6 is preferably in the shape of a waterproof gasket.
[0026] In this embodiment, the fixing part 61 is made of metal, and the waterproof part 62 is made of rubber. Preferably, the fixing part 61 is made of aluminum alloy to meet the current demand for lightweight bicycles.
[0027] The role and effect of the embodiments
[0028] The waterproof assembly for connecting the bottom bracket and crank according to this utility model aims to prevent water or dust from entering the bottom bracket cup by using a second waterproof component inside the bottom bracket cup and a first waterproof component on the bearing side end, thereby preventing water or dust from entering the connection between the bottom bracket and crank, ensuring lubrication inside the connection between the bottom bracket and crank, extending the service life of the bottom bracket and crank, and thus ensuring the practical effect of this utility model.
[0029] The above embodiments are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model.
Claims
1. A waterproof assembly for connecting a bottom bracket and a crank, disposed on the bottom bracket and located at the connection point between the bottom bracket and the crank, characterized in that, include: A central bearing cup is fitted onto the central shaft. The central bearing cup is a hollow, stepped shaft shape, comprising a small-diameter section and a large-diameter section. A positioning step is provided at the connection between the large-diameter section and the small-diameter section. At least a portion of the small-diameter section is in contact with the outer wall of the central shaft. The diameter of the large-diameter section is larger than the diameter of the central shaft. A bearing is fitted onto the central shaft, located inside the large-diameter section of the central shaft cup, and abuts against the positioning step. A first waterproof component is provided on both end faces of the bearing. The second waterproof component is fitted onto the central shaft and located inside the large-diameter section of the central shaft cup. The thickness of the second waterproof component is not less than the distance between the bearing and the crank. The first waterproof component has a fixing part and a waterproof part. One end of the fixing part abuts against the bearing. The waterproof part is disposed on the fixing part and covers the bottom end, the other end, and the top end of the fixing part. The bottom end of the waterproof part fits against the outer wall of the central shaft. The side end of the waterproof part abuts against the crank. The diameter of the waterproof part is not less than the diameter of the large-diameter section.
2. The waterproof assembly for connecting the central shaft and crankshaft according to claim 1, characterized in that: in, The fixing part is made of metal, and the waterproof part is made of rubber.
3. The waterproof assembly for connecting the central shaft and crankshaft according to claim 1, characterized in that: in, The first waterproof component is in the shape of a waterproof cap, and the second waterproof component is in the shape of a waterproof gasket.
4. The waterproof assembly for connecting the central shaft and crankshaft according to claim 1, characterized in that: in, The bearing is a ball bearing.