Detachable frame and electric bicycle

Abstract

The utility model relates to a detachable frame and an electric bicycle, and relates to the technical field of electric bicycles, the detachable frame comprises a frame main body, and the frame main body is provided with a front fork assembly used for being connected with a front wheel and a rear fork assembly used for being connected with a rear wheel; the rear fork assembly comprises two connecting plates which are symmetrically and fixedly arranged on the inserting main body, extending plates are detachably assembled on the parts, away from the frame main body, of the connecting plates, and limiting notches allowing a rear wheel rotating shaft to be placed in and limited are formed in the extending plates; due to the fact that the connecting plate and the extending plate are arranged in a split mode, when the rear wheel of the size needs to be replaced, only the extending plate needs to be replaced into the model matched with the rear wheel, the replacement cost is reduced, and the application range of the frame is widened; and meanwhile, the application range of the electric bicycle applying the bicycle frame is widened.

Description

Technical Field

[0001] The present application relates to the technical field of electric bicycles, and in particular to a detachable frame and an electric bicycle. Background Art

[0002] Electric bicycles, as a kind of personal transportation vehicle integrating mechanical and electronic technologies, have been widely used in many fields such as urban commuting, tourism sightseeing, and residential communities since their birth at the end of the last century. However, in actual applications, their designs also face some challenges.

[0003] Taking a certain electric bicycle as an example, it consists of core components such as a frame, a handlebar, front and rear wheels, a drive assembly, and a storage battery. An instrument system for controlling the drive assembly is also equipped on the handlebar. In order to connect the rear wheel, a special sheet metal structure is welded on the frame, and this structure is fixed to the rotating shaft of the rear wheel through bolts.

[0004] However, this design has encountered problems in actual operation. Due to the height differences of users, sometimes larger or smaller rear wheels need to be installed. However, the existing sheet metal structure cannot well adapt to the adjusted wheel sizes. To solve this problem, the current method is to replace the entire frame, which undoubtedly increases the cost and complexity of the adjustment and there is room for improvement. Summary of the Invention

[0005] The purpose of the present application is to provide a detachable frame and an electric bicycle to solve the problem that the frame in the above related technologies cannot flexibly match rear wheels of different sizes.

[0006] In the first aspect, a detachable frame provided by the present application adopts the following technical solution:

[0007] A detachable frame includes a frame body, on which a front fork assembly for connecting the front wheel and a rear fork assembly for connecting the rear wheel are provided; the rear fork assembly includes two connecting plates symmetrically fixed on a plug-in main body, and an extension plate is detachably assembled on the part of the connecting plate away from the frame body, and a limiting notch for placing and limiting the rotating shaft of the rear wheel is opened on the extension plate.

[0008] By adopting the above technical solution, due to the split setting of the connecting plate and the extension plate, when it is necessary to replace the rear wheel with a different size, only the extension plate needs to be replaced with a model matching the rear wheel, which reduces the replacement cost and also improves the applicable range of the frame; at the same time, it also improves the applicable range of the electric bicycle using this frame.

[0009] Optionally, limiting sunk grooves are opened on the inner edges of the limiting notch on the mutually remote side surfaces of the two extension plates.

[0010] By adopting the above technical solution, when the rear wheel is fixed, it is convenient to use a nut to fasten the rear wheel axle placed in the limit notch. Due to the setting of the limit sink, after fastening, the corresponding nut is simultaneously placed inside the corresponding limit sink, thereby reducing the possibility of the axle slipping out of the limit notch due to nut loosening and improving the installation stability of the rear wheel.

[0011] Optionally, connection bosses are fixedly provided on the mutually remote sides of the two connection plates, and the side of the connection boss remote from the connection plate is detachably connected to the extension plate.

[0012] By adopting the above technical solution, after the extension plate is installed, due to the setting of the connection boss, the distance between the two extension plates is increased, so that there is enough space to accommodate the rear wheel, facilitating the subsequent installation and fixation of the rear wheel.

[0013] Optionally, a positioning boss is fixedly provided on the side of the extension plate facing the connection boss, and a positioning sink for inserting a positioning rib is provided on the connection boss.

[0014] By adopting the above technical solution, due to the cooperative setting of the positioning boss and the positioning sink, when the extension plate and the connection boss are assembled, the positioning boss on the extension plate is inserted into the corresponding positioning sink at this time, thereby improving the installation stability of the extension plate.

[0015] Optionally, a plurality of relief sinks are provided on the sides of the connection boss and the positioning boss close to the connection plate.

[0016] By adopting the above technical solution, due to the setting of the relief sinks on the connection boss and the positioning boss, the overall processing cost of the vehicle frame is reduced and raw materials are saved.

[0017] Optionally, a locking screw is provided on the side of the extension plate, a locking through hole for the locking screw to penetrate is provided on the extension plate, and a locking screw hole coaxial with the locking through hole is provided on the bottom side of the positioning sink of the connection boss.

[0018] By adopting the above technical solution, due to the application setting of the locking screw, when the extension plate is installed on the connection boss, the locking screw is penetrated through the locking through hole and then screwed into the corresponding locking screw hole, thereby realizing the detachable connection between the extension plate and the connection plate and facilitating the subsequent replacement of the extension plate.

[0019] Optionally, an internal hexagonal sink is provided on the nut portion of the locking screw, and a locking sink for placing the nut portion of the locking screw is provided on the outer opening edge of the locking through hole on the extension plate.

[0020] By adopting the above technical solution, when the extension plate is installed on the connection boss, the locking screw passes through the locking through hole and is screwed into the corresponding locking screw hole. Finally, the nut part of the locking screw is completely placed inside the locking counterbore. When an external force knocks on the nut part of the locking screw, the possibility of the locking screw becoming loose due to the knock is reduced.

[0021] In a second aspect, an electric bicycle provided by the present application adopts the following technical solution:

[0022] An electric bicycle includes the detachable frame according to any one of the above and a drive assembly arranged on the frame body. The frame body is provided with a front wheel, a rear wheel, and a drive assembly for driving the rear wheel to rotate.

[0023] By adopting the above technical solution, when the detachable frame is applied to an electric bicycle, since the frame can replace different extension plates according to the size of the rear wheel and has a large application range, the application range of the corresponding electric bicycle is also improved.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. Due to the split setting of the connection plate and the extension plate, when it is necessary to replace the rear wheel with a different size, only the extension plate needs to be replaced with a model that matches the rear wheel, which reduces the replacement cost and also increases the application range of the frame; at the same time, the application range of the electric bicycle using this frame is also increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic diagram of the overall structure of the frame body shown in the embodiment of the present application;

[0028] Figure 2 It is a schematic diagram of the installation distribution of the extension plate and the connection plate shown in the embodiment of the present application;

[0029] Figure 3 It is a schematic diagram of the partial structure of the installation fit of the extension plate shown in the embodiment of the present application;

[0030] Figure 4 It is a schematic diagram of the partial cross-sectional structure of the installation fit of the extension plate and the connection plate shown in the embodiment of the present application;

[0031] Figure 5It is a schematic structural diagram showing the overall electric bicycle in the embodiments of the present application.

[0032] In the figure, 1 is the main frame body; 2 is the front fork assembly; 3 is the rear fork assembly; 31 is the connection plate; 311 is the connection boss; 312 is the positioning sink; 3121 is the relief sink; 3122 is the locking screw hole; 32 is the extension plate; 321 is the limit notch; 3211 is the limit sink; 322 is the positioning boss; 323 is the locking through hole; 3231 is the locking sink; 33 is the locking screw; 331 is the hexagon socket sink; 4 is the drive assembly; 5 is the front wheel; 6 is the rear wheel. Detailed implementation manners

[0033] The present application will be further described in detail below with reference to all the attached drawings.

[0034] Embodiment:

[0035] Referring to Figure 1 , a detachable frame includes the main frame body 1, wherein a front fork assembly 2 for connecting the front wheel 5 (see Figure 5 ) and a rear fork assembly 3 for connecting the rear wheel 6 (see Figure 5 ) are provided on the main frame body 1.

[0036] Referring to Figure 2 and Figure 3 , the rear fork assembly 3 includes two connection plates 31 symmetrically fixed on the main frame body 1. The connection plates 31 are fixed on the main frame body 1 by screws, and an extension plate 32 is detachably assembled on the part of the connection plate 31 away from the main frame body 1. Limit notches 321 are provided on both of the two extension plates 32; the axle of the rear wheel 6 (see Figure 5 ) is placed inside the limit notch 321 and fixed, thereby realizing the installation and fixation of the rear wheel 6 (see Figure 5 ).

[0037] Referring to Figure 2 and Figure 3 , connection bosses 311 are fixedly provided on the sides of the two connection plates 31 away from each other, and the connection plates 31 and the connection bosses 311 are integrally processed. A positioning boss 322 is integrally formed on the side of the extension plate 32 facing the connection boss 311, and a positioning sink 312 for inserting a positioning rib is provided on the connection boss 311.

[0038] The side of the connection boss 311 away from the connection plate 31 is detachably connected to the extension plate 32; with this setting, after the extension plate 32 is installed, the distance between the two extension plates 32 is increased, so that there is enough space to accommodate the rear wheel 6 (see Figure 5 ), which is convenient for the subsequent installation and fixation of the rear wheel 6 (see Figure 5 ).

[0039] Referring toFigure 4 On the side surfaces of the connecting boss 311 and the positioning boss 322 that are close to each other, a number of relief sunk grooves 3121 are provided, reducing the overall processing cost of the vehicle frame and saving raw materials.

[0040] Refer to Figure 4 On the side surface of the extension plate 32, a number of locking screws 33 are provided. Among them, an internal hexagonal sunk groove 331 is provided in the nut portion of the locking screw 33. A locking through hole 323 for the locking screw 33 to penetrate is provided on the extension plate 32. And on the extension plate 32, at the outer opening edge of the locking through hole 323, a locking sunk groove 3231 for placing the nut portion of the locking screw 33 is provided. A locking screw hole 3122 coaxial with the locking through hole 323 is provided on the bottom side of the positioning sunk groove 312 of the connecting boss 311.

[0041] When the extension plate 32 is installed on the connecting boss 311, the locking screw 33 is penetrated through the locking through hole 323 and then screwed into the corresponding locking screw hole 3122. Finally, the nut portion of the locking screw 33 is completely placed inside the locking sunk groove 3231.

[0042] Refer to Figure 3 On the inner edges of the limiting notches 321 on the side surfaces of the two extension plates 32 that are away from each other, limiting sunk grooves 3211 are provided. When the rear wheel 6 is fixed, it is convenient to use a nut to fasten the axle of the rear wheel 6 placed in the limiting notch 321. After fastening, the corresponding nut is simultaneously placed inside the corresponding limiting sunk groove 3211.

[0043] Refer to Figure 5 An electric bicycle includes the detachable vehicle frame described above, and a front wheel 5, a rear wheel 6, and a drive assembly 4 for driving the rear wheel 6 to operate are provided on the vehicle frame main body 1. The drive assembly 4 includes a storage battery, a motor, a foot pedal, transmission gears, a transmission chain, etc., which are all conventional structures and will not be elaborated here.

[0044] The implementation principle of the embodiment of this application is as follows:

[0045] Due to the split setting of the connecting plate 31 and the extension plate 32, when it is necessary to replace the rear wheel 6 with a different size, only the extension plate 32 needs to be replaced with a model that matches the rear wheel 6, reducing the replacement cost and also increasing the applicable range of the vehicle frame; at the same time, it also increases the applicable range of the electric bicycle using this vehicle frame.

[0046] Unless otherwise defined, the terms or scientific terms used in this application shall have the ordinary meanings as understood by those of ordinary skill in the art to which this application pertains. The terms "first", "second", "third" and similar terms used in the text of this application do not denote any order, quantity or importance, but are only used to distinguish different components. Similar terms such as "a" or "an" do not denote a quantity limitation either, but indicate that there is at least one. Terms such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. Terms such as "upper", "lower", "left", "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0047] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape and principle of this application shall be covered within the protection scope of this application.

Claims

1. A detachable bicycle frame, comprising a bicycle frame body (1), wherein the bicycle frame body (1) is provided with a front fork assembly (2) for connecting with a front wheel (5) and a rear fork assembly (3) for connecting with a rear wheel (6); It is characterized in that The rear fork assembly (3) comprises two connecting plates (31) symmetrically fixed on the plug-in body, and the portion of the connecting plate (31) away from the frame body (1) is detachably assembled with an extension plate (32), and the extension plate (32) is provided with a limiting notch (321) for the rear wheel (6) rotating shaft to be placed in a limiting position.

2. A detachable frame according to claim 1, characterized in that: A limiting recess (3211) is provided on the side surfaces of the two extension plates (32) that are away from each other and on the inner edge of the limiting notch (321).

3. A detachable frame according to claim 1, characterized in that: A connecting boss (311) is fixedly provided on the side surfaces of the two connecting plates (31) that are away from each other, and the side surface of the connecting boss (311) that is away from the connecting plate (31) is detachably connected to the extension plate (32).

4. A detachable frame according to claim 3, characterized in that: A positioning boss (322) is fixedly provided on the side of the extension plate (32) facing the connecting boss (311), and a positioning recessed groove (312) for inserting the positioning convex strip is provided on the connecting boss (311).

5. A detachable frame according to claim 4, characterized in that: The connecting boss (311) and the positioning boss (322) are both provided with a plurality of recessed grooves (3121) on the sides close to the connecting plate (31).

6. A detachable frame according to claim 4, characterized in that: A locking screw (33) is provided on the side of the extension plate (32), a locking through hole (323) for the locking screw (33) to pass through is opened on the extension plate (32), and a locking screw hole (3122) coaxial with the locking through hole (323) is opened on the bottom side of the positioning recess (312) of the connecting boss (311).

7. A detachable frame according to claim 6, characterized in that: The nut portion of the locking screw (33) is provided with an inner hexagonal recessed groove (331), and the outer opening edge of the locking through hole (323) is provided on the extension plate (32) with a locking recessed groove (3231) for the nut portion of the locking screw (33) to be placed.

8. An electric bicycle, characterized in that: It comprises the detachable frame according to any one of claims 1 to 7, wherein the frame body (1) is provided with a front wheel (5), a rear wheel (6) and a driving assembly (4) for driving the rear wheel (6) to rotate.

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