Front fork pipe steel bowl assembly and electric vehicle

Abstract

The utility model belongs to the technical field of frame structures, and particularly relates to a front fork tube steel bowl assembly and an electric bicycle, which comprise a bicycle tube for a front fork vertical tube to penetrate through and be matched, and an upper steel bowl, a needle bearing, a dustproof cover and a top cover which are annularly sleeved on the front fork vertical tube are sequentially stacked at the upper end of the bicycle tube from bottom to top. The upper steel bowl and the dustproof cover abut against the upper end face and the lower end face of an outer ring of the needle bearing respectively, an inner ring of the needle bearing is used for being fixedly arranged on a front fork stand pipe in a sleeving mode, the top cover is of an outer hexagon nut structure and is fixedly matched with the front fork stand pipe, and a press-fitting space for clamping the upper steel bowl, the needle bearing and the dustproof cover is formed between the top cover and the front end face of the bicycle pipe. The dustproof cover is simple in structure, reasonable in design and high in adaptability, on the basis of a traditional structure, the needle bearing is adopted to replace a ball bearing, the matching structure of the needle bearing between the steel bowl and the dustproof cover is reasonably designed so as to achieve the purpose of stable rotation, an existing steel bowl and a top cover part can be combined and assembled, and cost is low.

Description

A front fork tube cup assembly and an electric vehicle Technical Fields

[0001] This utility model belongs to the field of vehicle frame structure technology, specifically referring to a front fork tube steel cup assembly and an electric vehicle. Background Technology:

[0002] A Chinese utility model patent (authorization announcement number CN222388311U) discloses a waterproof headset for a fork and a bicycle. It includes two waterproof headsets, fitted onto the fork seat tube and symmetrically positioned at the two free ends of the head tube. Each headset comprises: a steel cup with a second retaining ring fixed to its first inner wall and a first retaining ring embedded in its inner wall near the second end; a ball bearing assembled inside the first end of the steel cup and located between the first and second retaining rings; and an outer retainer. The free end of the head tube abuts against the second end of the steel cup, and the first end of the outer retainer abuts against the second horizontal surface of the second retaining ring. The annular outer wall of the outer retainer is in tight contact with the annular inner wall of the first retaining ring to waterproof and dustproof the ball bearing. However, because the balls in the ball bearing roll within a raceway, there are defects such as large gaps, easy wear and loosening, leading to poor rotational stability. Invention content:

[0003] The purpose of this utility model is to provide a front fork tube cup assembly and an electric vehicle, which uses a needle roller bearing instead of a ball bearing and rationally designs the fitting structure of the needle roller bearing between the cup and the dust cover to achieve stable rotation.

[0004] This utility model is implemented as follows:

[0005] A fork tube cup assembly includes a tube through which the fork stem passes. From bottom to top, the upper end of the tube has an upper cup, a needle roller bearing, a dust cover, and a top cover stacked on the fork stem. The upper cup and the dust cover press against the upper and lower end faces of the outer ring of the needle roller bearing, respectively. The inner ring of the needle roller bearing is used to fix it on the fork stem. The top cover has an external hexagonal nut structure and is fixedly fitted to the fork stem. A press-fit space is formed between the top cover and the front end face of the tube to clamp the upper cup, the needle roller bearing, and the dust cover.

[0006] In the aforementioned fork tube cup assembly, the dust cover and the top cover are separate structures, and a fitting washer that loops around the fork stem is provided between the dust cover and the top cover.

[0007] In the aforementioned fork tube cup assembly, the inner wall of the top cover extends downward along its axial direction to form a pressing protrusion, and a fastening gasket is stacked between the upper end face of the mating washer and the bottom face of the pressing protrusion.

[0008] In the aforementioned fork tube cup assembly, the dust cover includes an annular base, the outer edge of which extends downward along its axial direction to form an annular baffle, and the upper end face of the outer ring of the needle roller bearing abuts against the annular base and is located inside the inner ring side of the annular baffle.

[0009] In the aforementioned fork tube cup assembly, a lower dustproof cup is provided at the lower end of the tube. The lower dustproof cup and the tube are an integral structure, and a needle roller bearing is provided between the lower dustproof cup and the fork stem tube.

[0010] Another object of this utility model is to provide an electric vehicle that includes a front fork tube cup assembly as described in any of the above claims.

[0011] The outstanding advantages of this utility model compared to the prior art are:

[0012] This utility model has a simple structure, reasonable design, and high adaptability. Based on the traditional structure, it uses needle roller bearings instead of ball bearings and reasonably designs the fitting structure between the needle roller bearing and the steel cup and dust cover to achieve stable rotation. It can also be assembled using existing steel cup and top cover parts, resulting in lower cost. Figure description:

[0013] Figure 1 is a cross-sectional view of the overall structure of this utility model.

[0014] In the diagram: 1. Vehicle tube; 2. Upper steel cup; 3. Needle roller bearing; 4. Dust cover; 5. Top cover; 6. Matching washer; 7. Pressing protrusion; 8. Fastening gasket; 9. Annular chassis; 10. Annular baffle; 11. Lower dustproof steel cup. Detailed implementation method:

[0015] The present invention will be further described below with reference to specific embodiments, see Figure 1:

[0016] A fork tube cup assembly includes a tube 1 through which the fork stem tube passes. From bottom to top, the upper end of the tube 1 has an upper cup 2, a needle roller bearing 3, a dust cover 4, and a top cover 5, which are all ringed around the fork stem tube. The upper cup 2 and the dust cover 4 press against the upper and lower end faces of the outer ring of the needle roller bearing 3, respectively. The inner ring of the needle roller bearing 3 is used to fix it to the fork stem tube. The top cover 5 has an external hexagonal nut structure and is fixedly fitted to the fork stem tube. A press-fit space is formed between the top cover 5 and the front end face of the tube 1 to clamp the upper cup 2, the needle roller bearing 3, and the dust cover 4.

[0017] This utility model has a simple structure, reasonable design and high adaptability. Based on the traditional structure, it uses a needle roller bearing 3 instead of a ball bearing and reasonably designs the fitting structure between the needle roller bearing 3 and the steel cup and dust cover 4 to achieve stable rotation. It can also be assembled using existing steel cup and top cover 5 parts, which reduces costs.

[0018] In this embodiment, the dust cover 4 and the top cover 5 can be an integral structure, which can effectively reduce the number of parts required. However, in this embodiment, the dust cover 4 and the top cover 5 are separate structures, and a mating washer 6 that is looped around the front fork stem is provided between the dust cover 4 and the top cover 5.

[0019] Meanwhile, in order to effectively press and secure the mating washer 6, the inner wall of the top cover 5 extends downward along its axial direction to form a pressing protrusion 7, and a fastening gasket 8 is stacked between the upper end face of the mating washer 6 and the bottom face of the pressing protrusion 7.

[0020] Furthermore, in order to provide dust and water protection for the needle roller bearing 3, the dust cover 4 includes an annular base 9, and an annular baffle 10 is formed by extending the outer edge of the annular base 9 downward along its axial direction. The upper end face of the outer ring of the needle roller bearing 3 abuts against the annular base 9 and is located inside the inner ring side of the annular baffle 10.

[0021] In addition, a lower dustproof steel cup 11 is provided at the lower end of the vehicle tube 1. The lower dustproof steel cup 11 and the vehicle tube 1 are an integral structure. A needle roller bearing 3 is provided between the lower dustproof steel cup 11 and the front fork stem tube.

[0022] Another objective of this invention is to provide an electric vehicle that includes the aforementioned front fork tube cup assembly.

[0023] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A fork tube cup assembly, comprising a tube (1) for the fork seat tube to pass through and mate with, characterized in that: The upper end of the vehicle tube (1) is stacked from bottom to top with an upper steel cup (2), a needle roller bearing (3), a dust cover (4), and a top cover (5) that are ringed on the front fork stem. The upper steel cup (2) and the dust cover (4) press against the upper and lower end faces of the outer ring of the needle roller bearing (3), respectively. The inner ring of the needle roller bearing (3) is used to fix it on the front fork stem. The top cover (5) is an external hexagonal nut structure and it is fixedly fitted with the front fork stem. A pressing space is formed between the top cover (5) and the front end face of the vehicle tube (1) to clamp the upper steel cup (2), the needle roller bearing (3), and the dust cover (4).

2. A fork tube and steel crown assembly according to claim 1, wherein: The dust cover (4) and the top cover (5) are separate structures, and a fitting washer (6) is provided between the dust cover (4) and the top cover (5) and is fitted on the front fork stem tube.

3. A fork tube cup assembly according to claim 2, characterized in that: The inner wall of the top cover (5) extends downward along its axial direction to form a pressing protrusion (7), and a fastening gasket (8) is stacked between the upper end face of the mating washer (6) and the bottom face of the pressing protrusion (7).

4. A fork tube cup assembly according to claim 1 or 2, characterized in that: The dust cover (4) includes an annular base (9), and the outer edge of the annular base (9) extends downward along its axial direction to form an annular baffle (10). The upper surface of the outer ring of the needle roller bearing (3) abuts against the annular base (9) and is located inside the inner ring side of the annular baffle (10).

5. A fork tube cup assembly according to claim 1, characterized in that: The lower end of the vehicle tube (1) is provided with a lower dustproof steel cup (11), which is an integral structure with the vehicle tube (1). A needle roller bearing (3) is provided between the lower dustproof steel cup (11) and the front fork stem tube.

6. An electric vehicle, characterized in that: It includes a front fork tube cup assembly as described in any one of claims 1-5.

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