A new type of electric tricycle hub

Abstract

This utility model discloses a novel hub for electric tricycles, aiming to solve the problems of easy wear and increased gaps in traditional aluminum hubs with grooved grooves. It includes an aluminum hub body, an iron inner core, and a locking nut. The hub body has a through cavity, including a first end cavity and a threaded cavity with a first threaded section. The inner core includes a core portion and a sleeve portion. The core portion has a second threaded section that is threadedly connected to the hub body, and the sleeve portion is installed in the second end cavity. The locking nut connects to the second threaded section of the core portion extending into the first end cavity via a third threaded section, with its ring-shaped end face abutting against the ring-shaped end face inside the first end cavity of the hub body for axial fixation. The hub body has first and second flanges, the core portion has a grooved core cavity, and the sleeve portion has an internal hexagonal sleeve cavity. This hub combines lightweight design with high strength, improves wear resistance and connection stability, extends service life, and ensures riding safety.

Description

Technical Field

[0001] This utility model relates to the field of hub technology, specifically to a novel electric tricycle hub. Background Technology

[0002] Currently, most electric tricycle hubs on the market use aluminum housings, and are typically connected and secured to the axle by directly machining grooves inside the aluminum housing. Aluminum, due to its light weight and ease of processing, to some extent meets the requirements for lightweight design and production cost control.

[0003] However, this type of structure has significant drawbacks in practical use: due to the relatively soft nature of aluminum, its wear resistance and deformation resistance are poor. After long-term exposure to loads, vibrations, and torque, the grooved areas on the inner wall are prone to wear, leading to a gradual increase in the clearance. This clearance can cause wheel wobble, abnormal noises, and other problems, seriously affecting riding stability and safety, while also reducing the user's riding experience. Furthermore, increased clearance can accelerate the wear of other connecting components, shorten the overall lifespan of the hub, and increase maintenance and replacement frequency and operating costs.

[0004] Therefore, there is an urgent need for a new type of hub structure that can effectively enhance the wear resistance and connection stability of key stress-bearing parts while retaining the lightweight advantages of aluminum components, and avoid gap problems caused by wear. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the above shortcomings, the purpose of this utility model is to provide a new type of electric tricycle hub. Through the double fixing structure of the threaded connection between the drum body and the inner core and the locking nut, combined with the material combination of aluminum drum body and iron inner core, the wear resistance and deformation resistance of key stress parts are effectively enhanced. At the same time, the synergistic effect of the threaded section and the flange achieves axial and radial stable fixing, thereby solving the problems of easy wear of the grooved inner wall of aluminum hub and increased connection gap in the prior art.

[0006] Technical Solution: This utility model provides a novel electric tricycle hub including a drum body, which is a hollow cylinder. The drum body has a through cavity along its axis, and the through cavity includes a first end cavity, a threaded cavity, an intermediate cavity, and a second end cavity arranged sequentially. The diameter of the threaded cavity is smaller than that of the intermediate cavity, and a first threaded section is provided on the inner ring wall. The inner core is also a hollow cylinder, comprising a core part and a core sleeve part. A second threaded section is provided on the outer ring wall of the end of the core part. When the core part extends... When inserted into the through cavity, the inner core and the drum body are threadedly connected by the second threaded section and the first threaded section, and tightened into the drum body by a mandrel. At this time, the portion of the core except for the second threaded section is located in the intermediate cavity, and the mandrel is located in the second end cavity. Part of the second threaded section is located in the threaded cavity, and the other part extends into the first end cavity. A locking nut, which is a hollow ring, has a third threaded section on its inner wall, which is threadedly connected and locked to the second threaded section of the core portion extending into the first end cavity. The second threaded section of the inner core portion and the first threaded section of the threaded cavity of the drum body form a main connection, and the basic fixation of the inner core and the drum body is achieved through thread engagement. The second threaded section extending into the first end cavity cooperates with the third threaded section of the locking nut to form a secondary locking structure. The double threaded connection significantly improves the connection strength between components. The core sleeve of the inner core is assembled in the second end cavity. On the one hand, it can serve as a force application point during assembly, making it easy to tighten the inner core into the drum body through the core sleeve, simplifying the installation operation. On the other hand, it forms a "two-end positioning" structure with the locking nut of the first end cavity, which restricts the shaking of the inner core from both axial ends, further improving the overall structural stability.

[0007] Furthermore, this application discloses a novel electric tricycle hub, wherein the hub body is made of aluminum and the inner core is made of iron. The inner core is made of iron, leveraging the high strength and rigidity of iron to enhance the load-bearing capacity of the threaded connection area of ​​the core body. The hub body is made of aluminum, and the two materials form a complementary performance structure of "lightweight outer shell + high-strength core".

[0008] Furthermore, in this application, a novel electric tricycle hub includes a locking nut comprising a ring cap and a ring body. The ring cap and ring body have the same inner diameter, while the outer diameter of the ring cap is larger than that of the ring body. A ring-shaped end face is provided between the ring cap and the ring body. The first end cavity includes a first outer end cavity and a first inner end cavity. The inner diameter of the first outer end cavity is larger than that of the first inner end cavity, forming an inner ring-shaped end face. When the locking nut is tightened with the inner core, the ring-shaped end face abuts against the inner ring-shaped end face, thereby axially fixing the drum body and the inner core. The tight abutment between the ring-shaped end face and the inner ring-shaped end face forcibly fixes the axial position of the drum body and the inner core using a mechanical limiting principle. Based on the original threaded connection (the second threaded section of the inner core and the third threaded section of the locking nut), a physical abutment structure between the ring-shaped end face and the inner ring-shaped end face is added, forming a dual fastening mechanism of "threaded locking + end face abutment". The threaded connection provides radial preload, while the end face contact provides axial restraint. The two forces work together to significantly improve the overall rigidity of the connection between the drum body and the inner core.

[0009] Furthermore, in a novel electric tricycle hub of this application, a first flange extends radially from the outer side of the first end cavity section of the drum body, and the first flange is provided with mounting holes in the circumferential direction. A pair of second flanges extend radially from the outer side of the threaded cavity section and the second end cavity section of the drum body, and the second flanges are provided with mounting holes in the circumferential direction.

[0010] Furthermore, in this application, a novel electric tricycle hub includes a core cavity within the core body, and a groove is formed on the inner wall of the core cavity along the axial direction of the core body. The groove on the inner wall of the core cavity along the axial direction serves as a guide channel during assembly. When the axle or other shaft components are inserted into the core cavity, the groove provides precise guidance, preventing jamming caused by misalignment during assembly. Simultaneously, the groove and the protrusions on the shaft components can form a temporary fit, assisting operators in quickly calibrating the coaxiality of the core body and the shaft components, simplifying the assembly process.

[0011] Furthermore, in this application, a novel electric tricycle hub has a core sleeve portion with a core sleeve cavity, the core sleeve cavity being hexagonal in shape. The core sleeve cavity is designed to be hexagonal, enabling precise adaptation to commonly available standardized tools such as hex wrenches.

[0012] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0013] 1. The novel electric tricycle hub described in this utility model combines an aluminum drum body with an iron inner core. While retaining the lightweight advantage of the drum body to control the overall weight, it utilizes the high strength and high wear resistance of iron to enhance the wear resistance and deformation resistance of key stress-bearing parts of the inner core. This effectively solves the problems of traditional all-aluminum hubs, which are prone to wear in grooves and have gradually increased clearances with use due to the relatively soft material. This significantly extends the overall service life of the hub.

[0014] 2. The novel electric tricycle hub described in this utility model improves connection stability through a synergistic structure of double threaded fixing and axial limiting: the main threaded connection between the inner core and the drum body forms a basic fixation, and the secondary threaded connection between the locking nut and the extension section of the inner core achieves enhanced locking. Combined with the "two-end positioning" formed by the core sleeve and the locking nut, and the axial contact between the end face of the locking nut ring and the end face of the inner ring of the drum body, a multi-fastening mechanism of "radial thread pre-tightening + axial mechanical limiting" is formed, which greatly reduces the risk of shaking between components, reduces abnormal noise, and effectively ensures stability and safety performance during riding. Attached Figure Description

[0015] Figure 1 This is an exploded cross-sectional view of a new type of electric tricycle hub according to this utility model;

[0016] Figure 2 This is a schematic diagram of a novel hub structure for an electric tricycle according to the present invention.

[0017] Explanation of reference numerals on the accompanying drawings:

[0018] 1-Drum body, 11-Through cavity, 111-First end cavity, 1111-First end outer cavity, 1112-First end inner cavity, 1113-Inner ring end face, 112-Threaded cavity, 1121-First threaded section, 113-Intermediate cavity, 114-Second end cavity, 12-First flange, 13-Second flange;

[0019] 2-Inner core, 21-Core body section, 211-Second threaded section, 212-Core body cavity, 213-Groogging, 22-Core sleeve section, 221-Core sleeve cavity;

[0020] 3-Locking nut, 31-Third thread section, 32-Ring cap, 33-Ring body, 34-Ring end face. Detailed Implementation

[0021] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] like Figure 1 , 2As shown, the novel electric tricycle hub disclosed in this embodiment includes a hub body 1, an inner core 2, and a locking nut 3. Through the synergistic effect of material optimization and structural design, a combination of lightweight and high stability is achieved.

[0024] The drum body 1 is a hollow aluminum cylinder with a through cavity 11 along its axis. The through cavity 11 consists of a first end cavity 111, a threaded cavity 112, an intermediate cavity 113, and a second end cavity 114 connected in sequence. The diameter of the threaded cavity 112 is smaller than that of the intermediate cavity 113, and a first threaded section 1121 is machined on its inner ring wall for forming a main connection with the inner core 2. The first end cavity 111 is further divided into a first outer end cavity 1111 and a first inner end cavity 1112. The inner diameter of the first outer end cavity 1111 is larger than that of the first inner end cavity 1112. The junction of the two forms an inner ring platform end face 1113, which provides an axial limiting basis for the locking nut 3. On the outer side of the drum body 1, a first flange 12 extends radially from the corresponding section of the first end cavity 111, and a pair of second flanges 13 extend radially from the corresponding sections of the threaded cavity 112 and the second end cavity 114. The first flange 12 and the second flange 13 are evenly distributed with mounting holes in the circumference for fixed connection with components such as wheel spokes.

[0025] The inner core 2 is a hollow iron cylinder, consisting of a core section 21 and a core sleeve section 22. A second threaded section 211 is machined on the outer annular wall of the end of the core section 21. During assembly, the core section 21 extends into the drum body 1 along the through cavity 11, and is initially fixed by the threaded engagement of the second threaded section 211 with the first threaded section 1121 of the threaded cavity 112. At this time, the portion of the core section 21 excluding the second threaded section 211 is fitted into the intermediate cavity 113, while the core sleeve section 22 is fitted into the second end cavity 114. Force can be applied through the core sleeve section 22 to tighten the entire inner core 2 into the drum body 1. It is worth noting that a portion of the second threaded section 211 is located within the threaded cavity 112, while another portion extends into the first end cavity 111, providing a structural basis for secondary locking. The inner side of the core part 21 is provided with a core cavity 212, and the inner wall of the core cavity 212 is machined with a groove 213 through the axial direction for forming a stable fit with the axle; the inner side of the core sleeve part 22 is provided with a core sleeve cavity 221, which adopts an internal hexagonal design and can be adapted to tools such as internal hexagonal wrenches, making it convenient to apply force during assembly.

[0026] The locking nut 3 is a hollow ring body, integrally formed from a ring cap 32 and a ring body 33. The inner diameters of the ring cap 32 and the ring body 33 are the same, while the outer diameter of the ring cap 32 is larger than that of the ring body 33. The joint between the two forms a ring-shaped end face 34. The inner sidewall of the ring body 33 is machined with a third threaded section 31. During assembly, the locking nut 3 is inserted into the core part 21 extending into the first end cavity 111. The third threaded section 31 is threadedly connected to the second threaded section 211 and tightened until the ring-shaped end face 34 is in close contact with the inner ring-shaped end face 1113 of the first end cavity 111. At this time, the drum body 1 and the inner core 2 are axially fixed through the dual action of "threaded locking + end face contact", effectively preventing relative shaking between components.

[0027] This embodiment achieves lightweighting through an aluminum drum body 1, while an iron inner core 2 enhances the wear resistance of key parts. Combined with a double threaded connection and axial limiting structure, it significantly improves the connection stability and service life of the hub, ensuring riding safety.

[0028] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A new type of electric tricycle hub, characterized by: include: The drum body (1) is a hollow cylinder. The drum body (1) has a through cavity (11) along the axis. The through cavity (11) includes a first end cavity (111), a threaded cavity (112), an intermediate cavity (113), and a second end cavity (114) arranged in sequence. The diameter of the threaded cavity (112) is smaller than the diameter of the intermediate cavity (113), and a first threaded section (1121) is provided on the inner ring wall. The inner core (2) is also a hollow cylinder. The inner core (2) includes a core part (21) and a core sleeve part (22). The outer ring wall of the end of the core part (21) is provided with a second threaded section (211). When the core part (21) extends into the through cavity (11), the inner core (2) and the drum (1) are threadedly connected by the second threaded section (211) and the first threaded section (1121), and are tightened in the drum (1) by the core sleeve part (22). At this time, the part of the core part (21) except for the second threaded section (211) is located in the intermediate cavity (113), and the core sleeve part (22) is located in the second end cavity (114). A part of the second threaded section (211) is located in the threaded cavity (112), and the other part extends into the first end cavity (111). Locking nut (3), the locking nut (3) is a hollow ring body, the inner side wall of the ring body is provided with a third threaded section (31), which is threadedly connected and locked with the second threaded section (211) of the core part (21) extending into the first end cavity (111).

2. The novel electric tricycle hub according to claim 1, characterized in that, The drum body (1) is made of aluminum, and the inner core (2) is made of iron.

3. The novel electric tricycle hub according to claim 2, characterized in that, The locking nut (3) includes a ring cap (32) and a ring body (33). The inner diameters of the ring cap (32) and the ring body (33) are the same. The outer diameter of the ring cap (32) is larger than the outer diameter of the ring body (33). A ring platform end face (34) is provided between the ring cap (32) and the ring body (33). The first end cavity (111) includes a first end outer cavity (1111) and a first end inner cavity (1112). The inner diameter of the first end outer cavity (1111) is larger than the inner diameter of the first end inner cavity (1112). An inner ring platform end face (1113) is formed between the two. When the locking nut (3) is tightened with the inner core (2), the ring platform end face (34) abuts against the inner ring platform end face (1113) so that the drum body (1) and the inner core (2) are axially fixed.

4. The novel electric tricycle hub according to claim 3, characterized in that, A first flange (12) extends radially from the outer side of the first end cavity (111) of the drum body (1), and the first flange (12) is provided with mounting holes in the circumferential direction. A pair of second flanges (13) extend radially from the outer side of the threaded cavity (112) and the second end cavity (114) of the drum body (1), and the second flanges (13) are provided with mounting holes in the circumferential direction.

5. A novel electric tricycle hub according to claim 4, characterized in that, The core part (21) is provided with a core cavity (212), and the inner sidewall of the core cavity (212) is provided with a groove (213) along the axial direction of the core part (21).

6. A novel electric tricycle hub according to claim 5, characterized in that, The heart sleeve (22) has a heart sleeve cavity (221) inside, and the heart sleeve cavity (221) is hexagonal.

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