central shaft assembly

Abstract

The utility model provides a kind of middle shaft assembly, it is related to electric vehicle accessories technical field, the device includes the utility model provides, including middle shaft main body, middle shaft adapter, wherein, middle shaft adapter is set at the both ends of middle shaft main body, middle shaft main body is connected with middle shaft adapter by screw thread, middle shaft main body is on frame, middle shaft main body is set in frame, one end of middle shaft adapter is exposed outside vehicle body, when not installing foot pedal, middle shaft assembly is installed on frame, since middle shaft adapter is connected with middle shaft main body by screw thread, middle shaft adapter can be detached from middle shaft main body, to reduce the length of middle shaft assembly overall. Middle shaft main body is completely set in frame in this way, avoid the case of external projection, reduce the security risk that easily produces to be rolled into clothing, scratch human leg.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle parts technology, and in particular to a central shaft assembly. Background Technology

[0002] Currently, most electric bicycles are equipped with a bottom bracket pedal, allowing customers to temporarily power themselves by pedaling when the battery is dead. Traditional bottom brackets are typically one-piece designs, with the bottom bracket housing directly fixed to the frame's bottom bracket (mounting holes). Traditional one-piece bottom brackets are less prone to loosening, have good sealing, and are suitable for mainstream models. However, the ends of these one-piece bottom brackets are often exposed outside the frame, resulting in significant protrusion and posing safety hazards such as clothing getting caught in the bottom bracket or scraping against the rider's legs. Utility Model Content

[0003] The purpose of this utility model is to provide a central axis assembly to solve the technical problem in the prior art where the central axis protrudes excessively and easily gets caught in clothing. The various technical effects of the preferred technical solutions provided by this utility model are detailed below.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] The present invention provides a central axis assembly, comprising a central axis body and a central axis adapter, wherein the central axis adapter is disposed at both ends of the central axis body, and the central axis body and the central axis adapter are detachably connected.

[0006] Preferably, it also includes a crank, and the two ends of the central shaft are provided with a first milled flat groove. The first milled flat groove is provided at least once. The crank is provided with a first through hole to be installed at the position of the first milled flat groove and abutting against the side wall of the first milled flat groove to define the position of the crank.

[0007] Preferably, the end of the bottom bracket adapter away from the bottom bracket body is provided with a connecting hole, the end face of the first fastener abuts against the end face of the crank, and the other end passes through the crank and is connected to the bottom bracket adapter.

[0008] Preferably, the end of the crank away from the central shaft is provided with a countersunk groove.

[0009] Preferably, a second threaded portion is provided on the side wall of the countersunk groove.

[0010] Preferably, the central shaft body is provided with two second milling grooves, which are close to the first milling groove.

[0011] Preferably, the central axis body is hollow.

[0012] Preferably, it also includes a foot pedal mounted on the other end of the crank.

[0013] The technical solution provided in this application document has the following beneficial effects: This utility model provides a bottom bracket assembly, including a bottom bracket body and a bottom bracket adapter. The bottom bracket adapter is located at both ends of the bottom bracket body, and the bottom bracket body and the bottom bracket adapter are connected by threads. The bottom bracket body is mounted on the frame and is housed within the frame. One end of the bottom bracket adapter is exposed outside the frame. When the pedals are not installed, the bottom bracket assembly is mounted on the frame. Because the bottom bracket adapter is connected to the bottom bracket body by threads, the bottom bracket adapter can be detached from the bottom bracket body to reduce the overall length of the bottom bracket assembly. This way, the bottom bracket body is completely housed within the frame, avoiding protrusion and reducing the safety hazards of clothing getting caught or scraping against the user's legs. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the central shaft assembly provided in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram illustrating the connection structure between the central axis body and the central axis adapter according to an exemplary embodiment; Figure 3 This is a schematic diagram illustrating a structure for connecting a crank to a transfer hub according to an exemplary embodiment; Figure 4 This is a schematic diagram illustrating the structure of a crank according to an exemplary embodiment.

[0016] In the figure: 1. Main body of central shaft; 11. Second milled flat groove; 2. Central shaft adapter; 21. First milled flat groove; 22. Connecting hole; 3. Crank; 31. First through hole; 32. Countersunk groove; 4. Foot pedal; 5. First fastener. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] This specific embodiment provides a central axis assembly to solve the technical problem in the prior art where the central axis protrudes excessively and easily gets caught in clothing.

[0019] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model as described in the claims. Additionally, the complete contents of the structures represented in the following embodiments are not limited to those necessary for the solution of the utility model as described in the claims.

[0020] Reference Figures 1-4 This utility model provides a bottom bracket assembly, including a bottom bracket body 1 and a bottom bracket adapter 2. The bottom bracket adapter 2 is located at both ends of the bottom bracket body 1, and the bottom bracket body 1 and the bottom bracket adapter are detachably connected. Specifically, the bottom bracket body 1 and the bottom bracket adapter 2 can be connected by threads. The bottom bracket body 1 is mounted on the frame and is located inside the frame. One end of the bottom bracket adapter 2 is exposed outside the frame. When the pedals are not installed, the bottom bracket assembly is mounted on the frame. Because the bottom bracket adapter 2 is connected to the bottom bracket body 1 by threads, the bottom bracket adapter 2 can be removed from the bottom bracket body 1 to reduce the overall length of the bottom bracket assembly. In this way, the bottom bracket body 1 is completely located inside the frame, avoiding protrusion and reducing the safety hazards of clothing getting caught or scraping against the user's legs, thus improving safety performance.

[0021] The preferred option is to make the central shaft body 1 hollow, which reduces the weight of the central shaft assembly, increases the rotation speed, reduces the use of materials, and lowers the production cost of the central shaft assembly. The hollow structure inside the central shaft body 1 has a small coefficient of thermal expansion, which reduces the deformation of the central shaft body 1.

[0022] Further optimization of the scheme also includes a crank 3, and first milled flat grooves 21 are provided on the circumferential surfaces of both ends of the central shaft adapter 2. The first milled flat groove 21 is provided at least once. The crank 3 is provided with a first through hole 31 to be installed at the position of the first milled flat groove 21 and abuts against the side wall of the first milled flat groove 21 to limit the position of the crank 3. At the same time, since the central shaft adapter 2 is connected to the central shaft body 1 by a thread, when the central shaft adapter 2 is installed, the first milled flat groove 21 can provide a place for the wrench, so that the central shaft adapter 2 and the central shaft body 1 can be firmly connected.

[0023] To further optimize the design, in order to facilitate the fixing of crank 3, the end face of the bottom bracket adapter 2 away from the bottom bracket body 1 is provided with a connecting hole 22. The end face of the first fastener 5 abuts against the end face of crank 3, and the other end passes through crank 3 and connects to bottom bracket adapter 2. In this way, crank 3 is fixed on the first milled flat groove 21 to prevent crank 3 from wobbling left and right. The first fastener 5 is an M8 bolt.

[0024] To further optimize the design, in order to prevent the end face of the first fastener 5 from protruding outward, a countersunk groove 32 is provided at the end of the crank 3 away from the central shaft adapter 2. The countersunk groove 32 is used to accommodate the end of the first fastener 5.

[0025] The countersunk groove 32 has a second threaded part on its side wall. The second threaded part is used to install the plug to ensure the flatness of the end face.

[0026] To further optimize the design, in order to facilitate the installation of the central axle body 1 from both sides of the frame, two second milling grooves 11 are provided on the central axle body 1. The corresponding second milling grooves 11 are close to the corresponding first milling grooves 21, which can play a role in preventing mistakes.

[0027] Further optimization of the design also includes a foot pedal 4 installed at the other end of the crank 3 for easy foot pedaling.

[0028] It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., used herein to indicate the orientation or positional relationship shown in the accompanying drawings, are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In this description, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

[0031] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the content not described in detail in some embodiments can be referred to the same or similar content in other embodiments. The multiple solutions provided in this application contain their own basic solutions, are independent of each other, and do not restrict each other, but they can also be combined with each other without conflict to achieve multiple effects.

[0032] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A central shaft assembly, characterized in that, It includes a central axis body (1) and a central axis adapter (2). The central axis adapter (2) is located at both ends of the central axis body (1). The central axis body (1) and the central axis adapter (2) are detachably connected.

2. The central shaft assembly according to claim 1, characterized in that, It also includes a crank (3), and a first milled flat groove (21) is provided on the circumferential surface of both ends of the central shaft adapter (2). The first milled flat groove (21) is provided at least once. The crank (3) is provided with a first through hole (31) to be installed at the position of the first milled flat groove (21) and abutting against the side wall of the first milled flat groove (21) to limit the position of the crank (3).

3. The central shaft assembly according to claim 2, characterized in that, The central shaft adapter (2) has a connecting hole (22) at one end away from the central shaft body (1), the end face of the first fastener (5) abuts against the end face of the crank (3), and the other end passes through the crank (3) and connects to the central shaft adapter (2).

4. The central shaft assembly according to claim 2, characterized in that, The crank (3) is provided with a countersunk groove (32) at the end away from the central shaft adapter (2).

5. The central shaft assembly according to claim 4, characterized in that, A second threaded portion is provided on the side wall of the countersunk groove (32).

6. The central shaft assembly according to claim 2, characterized in that, The central shaft body (1) is provided with two second milling grooves (11), which are close to the first milling groove (21).

7. The central shaft assembly according to claim 1, characterized in that, The central axis body (1) is hollow.

8. The central shaft assembly according to claim 2, characterized in that, It also includes a foot pedal (4) mounted on the other end of the crank (3).

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