Rear bottom fork assembly of electric bicycle and electric bicycle

Abstract

The rear fork assembly comprises a connecting piece, a left fork hook, a right fork hook, a left fork tube and a right fork tube, the left fork tube and the right fork tube are arranged on the connecting piece, the left fork hook comprises a left fork hook body, a first inserting plate and a first reinforcing plate, and the right fork hook comprises a right fork hook body. The rear end of the left flat fork pipe is provided with a first inserting hole matched with the first inserting plate, and when the first inserting plate is fixedly connected into the first inserting hole, the first reinforcing plate can abut against and be fixedly connected to the left flat fork pipe. A second inserting hole matched with the second inserting plate is formed in the rear end of the right bottom fork pipe, and when the second inserting plate is fixedly connected into the second inserting hole, the second reinforcing plate can abut against and be fixedly connected to the right bottom fork pipe. Through structural optimization, the fork hook and the bottom fork pipe are structurally matched, the upper end of the bottom fork pipe is structurally reinforced, and the welding length and position are increased.

Description

Technical Field

[0001] This utility model relates to the field of electric bicycle technology, and in particular to an electric bicycle rear flat fork assembly and an electric bicycle. Background Technology

[0002] Electric bicycles have become a widely used daily mode of transportation. The frame, as the core structural framework of the entire vehicle, supports the frame and connects various components, functioning similarly to a "skeleton system." As one of the main components of an electric bicycle, its quality directly affects user safety. Its materials, manufacturing processes, and design collectively determine the vehicle's safety, durability, and functional expandability. From basic support to intelligent integration, the frame's role spans the entire lifecycle of the vehicle, requiring performance optimization through a combination of materials science, mechanical design, and manufacturing technology. The main frame is typically constructed from metal tubing or composite materials, formed through welding or die casting processes. It includes key components such as the main frame, rear swingarm, and front fork, forming a complete mechanical load-bearing system. The frame's structural form should meet its requirements in terms of assemblability, rigidity, and strength. Among these components, the rear swingarm assembly is the main part connecting to the rear wheel, with the fork hook at its end being a crucial component for connecting and supporting the rear wheel.

[0003] In the existing technology, the main body of the rear swingarm assembly is fastened and welded to the fork hook through a single connection point. The product structure is not strong enough, and the welding strength of such a structure cannot meet the growing demand for high power and high speed of electric bicycles. During the vehicle's operation, the fork hook is very likely to detach from the main body of the rear swingarm assembly, posing a safety hazard. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of the existing technology by providing a rear swingarm assembly for electric bicycles and an electric bicycle.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] In a first aspect, a rear swingarm assembly for an electric bicycle is provided, comprising a connector and a left swingarm tube and a right swingarm tube disposed on the connector, characterized in that: it further comprises a left hook and a right hook, the left swingarm tube and the right swingarm tube being symmetrically connected to the left and right ends of the connector, the left hook comprising a left hook body, and a first insertion plate and a first reinforcing plate disposed at the front end of the left hook body, the right hook comprising a right hook body, and a second insertion plate and a second reinforcing plate disposed at the front end of the right hook body, the rear end of the left swingarm tube being provided with a first insertion hole that mates with the first insertion plate, the first reinforcing plate being able to abut against and be fixedly connected to the left swingarm tube when the first insertion plate is fixedly connected to the first insertion hole, the rear end of the right swingarm tube being provided with a second insertion hole that mates with the second insertion plate, the second reinforcing plate being able to abut against and be fixedly connected to the right swingarm tube when the second insertion plate is fixedly connected to the second insertion hole.

[0007] Furthermore, the left fork hook body, the first insertion plate, and the first reinforcing plate are integrally stamped, and the right fork hook body, the second insertion plate, and the second reinforcing plate are integrally stamped.

[0008] Furthermore, a left stamping groove is provided at the front end of the left flat fork tube, and a right stamping groove is provided at the front end of the right flat fork tube. The two ends of the connector are respectively fixedly connected to the left stamping groove and the right stamping groove.

[0009] Furthermore, a rear mudguard mounting portion is provided on the left and right horizontal fork tubes respectively, and the rear mudguard mounting portion includes a rear mudguard mounting hole.

[0010] Furthermore, several wire harness fixing rings are provided on the right flat fork tube.

[0011] Furthermore, the front ends of the left and right flat fork tubes are respectively provided with a first frame connection part and a second frame connection part, and the first frame connection part and the second frame connection part are rotatably connected to the frame.

[0012] Furthermore, the upper ends of the left fork hook body and the right fork hook body are respectively provided with a first shock absorber connection part and a second shock absorber connection part.

[0013] Furthermore, the left fork hook body and the right fork hook body are respectively provided with a first U-shaped groove and a second U-shaped groove for installing the rear wheel.

[0014] Furthermore, the left fork hook body is provided with a brake post for connecting to the braking system.

[0015] In a second aspect, an electric bicycle is provided, characterized in that it includes a frame and the electric bicycle rear swingarm assembly described in the first aspect, wherein the frame is connected to the electric bicycle rear swingarm assembly.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. The fork hook structure has been optimized. The plug plate and reinforcing plate on the fork hook can be welded and fastened to the left and right flat fork tubes in multiple directions in the horizontal and vertical directions. The welding length and position of the fork hook and flat fork tube have been increased, which greatly improves the strength of the flat fork component product structure under high-speed conditions. The rigidity has also been further improved, meeting the growing demand for high power and high speed of electric bicycles.

[0018] 2. The stamping groove at the front end of the flat fork tube enhances the strength of the flat fork tube and the connecting parts; the one-piece stamped fork hook structure integrates the shock absorber connection part, U-shaped groove, brake post and other structures, which improves the assembly efficiency of the flat fork assembly, thereby improving the assembly efficiency of the electric bicycle frame, saving production costs and improving production efficiency.

[0019] Other features and advantages of this invention will be set forth in the following description or may be learned by practicing this invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0021] Figure 2 This is a schematic diagram of the left and right horizontal fork tubes in Example 1;

[0022] Figure 3 This is a schematic diagram of the left and right fork hooks in Example 1;

[0023] In the diagram: 1-Connector, 2-Left flat fork tube, 3-Right flat fork tube, 4-Left fork hook, 5-Right fork hook, 21-First insertion hole, 22-First frame connection, 31-Second insertion hole, 32-Right stamping groove, 33-Rear mudguard mounting part, 34-Rear mudguard mounting hole, 35-Wire harness fixing ring, 36-Second frame connection, 41-Left fork hook body, 42-First insertion plate, 43-First reinforcing plate, 44-First shock absorber connection, 45-First U-shaped groove, 46-Brake post, 51-Right fork hook body, 52-Second insertion plate, 53-Second reinforcing plate, 54-Second shock absorber connection, 55-Second U-shaped groove. Detailed Implementation

[0024] To enhance understanding of this utility model, we will now describe it in further detail with reference to the accompanying drawings. This embodiment is only used to explain this utility model and does not constitute a limitation on the scope of protection of this utility model.

[0025] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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.

[0026] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," and "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Example 1

[0029] like Figure 1-3 As shown, an electric bicycle rear swingarm assembly includes a connector 1, a left fork hook 4, and a right fork hook 5, as well as a left swingarm tube 2 and a right swingarm tube 3 disposed on the connector 1. The left swingarm tube 2 and the right swingarm tube 3 are symmetrically connected to the left and right ends of the connector 1. The left fork hook 4 includes a left fork hook body 41, and a first insertion plate 42 and a first reinforcing plate 43 disposed at the front end of the left fork hook body 41. The right fork hook 5 includes a right fork hook body 51, and a second insertion plate 52 disposed at the front end of the right fork hook body 51. The second reinforcing plate 53 has a first insertion hole 21 at the rear end of the left horizontal fork tube 2 that mates with the first insertion plate 42. When the first insertion plate 42 is fixedly connected in the first insertion hole 21, the first reinforcing plate 53 can abut against and be fixedly connected to the left horizontal fork tube 2. The right horizontal fork tube 3 has a second insertion hole 31 at the rear end that mates with the second insertion plate 52. When the second insertion plate 52 is fixedly connected in the second insertion hole 31, the second reinforcing plate 53 can abut against and be fixedly connected to the right horizontal fork tube 3.

[0030] Specifically, the first insertion hole 21 and the second insertion hole 31 are elongated structures. During assembly, the cross-sectional size of the first insertion plate 42 and the second insertion plate 52 is just right to be inserted into the first insertion hole 21 and the second insertion hole 31, respectively. At this time, the edges of the first insertion hole 21 and the second insertion hole 31 are tightly against the edges of the first insertion plate 42 and the second insertion plate 52, respectively. At the same time, the lower edges of the first reinforcing plate 43 and the second reinforcing plate 53 are also tightly against the upper edges of the left horizontal fork tube 2 and the right horizontal fork tube 3. Then, welding is applied between these abutting parts to firmly fix the left horizontal fork tube 2 and the left fork hook 4, and the right horizontal fork tube 3 and the right fork hook 5. This structural matching method changes the original single connection point fastening method. The welding length and position of the fork hook and the horizontal fork tube are increased, which greatly improves the strength and rigidity of the horizontal fork assembly product structure under high-speed conditions.

[0031] Preferably, the front end of the left flat fork tube 2 is provided with a left stamping groove, and the front end of the right flat fork tube 3 is provided with a right stamping groove 32. The positions of the left stamping groove and the right stamping groove 32 are corresponding. The two ends of the connector 1 are respectively fixedly connected to the left stamping groove and the right stamping groove 32. The left stamping groove can strengthen the connection between the left flat fork tube 2 and the connector 1, and the right stamping groove 32 can strengthen the connection between the right flat fork tube 3 and the connector 1.

[0032] Rear mudguard mounting portions 33 are respectively provided on the left swingarm tube 2 and the right swingarm tube 3. Each rear mudguard mounting portion 33 includes a rear mudguard mounting hole 34, which enables the assembly and fixation of the rear mudguard. Several wiring harness retaining rings 35 are provided on the right swingarm tube 3 for fixing the motor wiring harness. A first frame connecting portion 22 and a second frame connecting portion 36 are respectively provided at the front end of the left swingarm tube 2 and the right swingarm tube 3. The first frame connecting portion 22 and the second frame connecting portion 36 are rotatably connected to the frame, achieving connection to the frame body.

[0033] Preferably, the left fork hook body 41 and the right fork hook body 51 are respectively provided with a first U-shaped groove 45 and a second U-shaped groove 55 for mounting the rear wheel. The rear wheel is connected by engaging the first U-shaped groove 45 and the second U-shaped groove 55. After the rear wheel axle is engaged in the first U-shaped groove 45 and the second U-shaped groove 55, the rear wheel is rotatably connected to the electric bicycle rear fork assembly.

[0034] The upper ends of the left fork hook body 41 and the right fork hook body 51 are respectively provided with a first shock absorber connecting part 44 and a second shock absorber connecting part 54. After the electric bicycle rear swingarm assembly is installed on the frame body, the rear shock absorber is rotatably connected to the first shock absorber connecting part 44 and the second shock absorber connecting part 54 respectively to achieve the connection and cooperation between the electric bicycle rear swingarm assembly and the rear shock absorber.

[0035] The left fork hook body 41 is equipped with a brake lever 46 for connecting to the braking system. The brake lever 46 cooperates with the U-shaped limiting groove reserved in the drum brake cover to limit the rotation of the drum brake.

[0036] Both the left fork hook 4 and the right fork hook 5 are integrally stamped. During the stamping process, the first U-shaped groove 45, the second U-shaped groove 55, the first shock absorber connecting part 44 and the second shock absorber connecting part 54 are punched out in one go. Therefore, the relative position of the holes is very accurate, which greatly improves the consistency and accuracy of the assembly.

[0037] Example 2

[0038] An electric bicycle includes a frame and the electric bicycle rear swingarm assembly described in Embodiment 1, wherein the frame is connected to the electric bicycle rear swingarm assembly.

[0039] The above specific embodiments are only for illustrating the technical concept and structural features of this utility model, and are intended to enable those skilled in the art to implement them. However, the above content does not limit the protection scope of this utility model. Any equivalent changes or modifications made in accordance with the spirit and essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. An electric bicycle rear fork assembly, comprising a connecting piece (1), and a left fork tube (2) and a right fork tube (3) arranged on the connecting piece (1), characterized in that: Further comprising a left fork hook (4) and a right fork hook (5), the left fork tube (2) and the right fork tube (3) are connected to the left and right ends of the connecting piece (1) in a relative symmetry, the left fork hook (4) comprises a left fork hook body (41), and a first plug-in plate (42) and a first reinforcing plate (43) arranged at the front end of the left fork hook body (41), the right fork hook (5) comprises a right fork hook body (51), and a second plug-in plate (52) and a second reinforcing plate (53) arranged at the front end of the right fork hook body (51), the rear end of the left fork tube (2) is provided with a first plug-in hole (21) matched with the first plug-in plate (42), when the first plug-in plate (42) is fixedly connected in the first plug-in hole (21), the first reinforcing plate (43) can abut and be fixedly connected on the left fork tube (2), the rear end of the right fork tube (3) is provided with a second plug-in hole (31) matched with the second plug-in plate (52), when the second plug-in plate (52) is fixedly connected in the second plug-in hole (31), the second reinforcing plate (53) can abut and be fixedly connected on the right fork tube (3).

2. The electric bicycle rear fork assembly according to claim 1, wherein: The left fork hook body (41), the first plug-in plate (42) and the first reinforcing plate (43) are integrally stamped, and the right fork hook body (51), the second plug-in plate (52) and the second reinforcing plate (53) are integrally stamped.

3. The electric bicycle rear fork assembly of claim 1, wherein: A left stamping groove is arranged at the front end of the left fork tube (2), and a right stamping groove (32) is arranged at the front end of the right fork tube (3), and the two ends of the connecting piece (1) are fixedly connected to the left stamping groove and the right stamping groove (32) respectively.

4. The electric bicycle rear fork assembly of claim 1, wherein: Rear mud plate mounting portions (33) are arranged on the left fork tube (2) and the right fork tube (3) respectively, and the rear mud plate mounting portions comprise rear mud plate mounting holes (34).

5. The electric bicycle rear fork assembly of claim 1, wherein: A plurality of wire harness fixing rings (35) are arranged on the right fork tube (3).

6. The electric bicycle rear fork assembly of claim 1, wherein: First frame connecting portions (22) and second frame connecting portions (36) are arranged at the front ends of the left fork tube (2) and the right fork tube (3) respectively, and the first frame connecting portions (22) and the second frame connecting portions (36) are rotatably connected to a frame.

7. The electric bicycle rear fork assembly of claim 6, wherein: First shock absorber connecting portions (44) and second shock absorber connecting portions (54) are arranged at the upper ends of the left fork hook body (41) and the right fork hook body (51) respectively.

8. The electric bicycle rear fork assembly of claim 1, wherein: First U-shaped grooves (45) and second U-shaped grooves (55) are arranged on the left fork hook body (41) and the right fork hook body (51) respectively for mounting rear wheels.

9. The electric bicycle rear fork assembly of claim 1, wherein: A brake cylinder (46) is arranged on the left fork hook body (41) for connecting a brake system.

10. An electric bicycle, characterized by: A frame is connected with the electric bicycle rear fork assembly of any one of claims 1-9.

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