Squeeze-cast rear triangle of electric bicycle

Abstract

The utility model discloses a squeeze-cast rear triangle of an electric bicycle, which belongs to the technical field of electric bicycles and comprises an upper tube, the bottom surface of the upper tube is fixedly connected with a lower tube, the outer surface of the lower tube is provided with two shock absorber front holes, and front rotating nails are arranged in the two shock absorber front holes. According to the squeeze-cast rear triangle of the electric bicycle, an aluminum alloy squeeze casting process is adopted for the rear triangle of the electric bicycle, the whole rear triangle is integrally formed at a time, the number of parts is further reduced, the rear triangle serves as a whole and is easy to install, manpower is saved, and therefore the labor cost is further reduced, and the working efficiency is further improved; and more importantly, parts with various functions are integrally formed to form a part, so that the product consistency is higher, the deformation is reduced, the product quality is improved, the intelligent assembly of the whole electric moped is easy to realize, and the after-sales service cost is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric bicycles, and more specifically, particularly relates to an extrusion-cast rear triangle of an electric bicycle. Background Art

[0002] With the development of science and technology, electric vehicles have become the largest means of transportation in my country. We are all aware of the environmental friendliness of electric vehicles and are working hard to use this green means of transportation. The electric vehicle frame is composed of a front triangle and a rear triangle. According to the different materials, the frame can be simply divided into a steel frame, an aluminum frame, a titanium frame, and a carbon frame. The frames of the first three metal materials are not made of pure metal pipes, and the process of making the frame is more diverse and extensive. Although the existing technology has completely abandoned the argon arc welding process and adopted the extrusion casting process to form the left and right flat forks at one time, the entire rear triangle still needs to be composed of the left and right parts, and must be bolted to form the rear triangle of a frame. There are still many processes and parts, which affects the improvement of production efficiency.

[0003] Therefore, in order to solve the above problems, we provide an extrusion-cast electric bicycle rear triangle. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an extrusion-cast rear triangle of an electric bicycle to solve the technical problem that although the prior art completely abandons the argon arc welding process and adopts the extrusion casting process to form the left and right flat forks respectively at one time, the entire rear triangle still needs to be composed of a left and a right part, which must be fastened with bolts to form the rear triangle of a frame, and there are still many processes and parts, which affects the improvement of production efficiency.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions: an extrusion-cast rear triangle of an electric bicycle, comprising an upper tube, the bottom surface of the upper tube is fixedly connected to a lower tube, the outer surface of the lower tube is provided with two shock absorber front holes, the interiors of the two shock absorber front holes are provided with front rotating nails, the ends of the two front rotating nails close to each other are fixedly connected to a connector, the right end of the connector is fixedly connected to a shock absorber body, the inner wall of the lower tube is hinged with a left flat fork and a right flat fork through a rotating shaft hinge, the left flat fork A left vertical fork is fixedly connected to the upper surface of the fork, a right vertical fork is fixedly connected to the upper surface of the right horizontal fork, a left rear hook is fixedly connected to the right end of the left horizontal fork, a right rear hook is fixedly connected to the right end of the right horizontal fork, a connecting ring is fixedly connected to the left end of the left horizontal fork and the left end of the right horizontal fork, a clamping hole is provided on the outer surface of the two connecting rings, a rear rotating nail is provided inside the two clamping holes, a connecting block is fixedly connected to one end of the two rear rotating nails close to each other, and a left end of the connecting block is fixedly connected to the right end of the shock absorber body.

[0006] As a preferred technical solution of the utility model, the left end of the upper tube is fixedly connected to the head tube, and the outer surface of the lower tube is provided with a five-way connection.

[0007] As a preferred technical solution of the utility model, the right end of the upper tube is fixedly connected to a saddle tube, and the outer surface of the saddle tube is provided with two notches.

[0008] As a preferred technical solution of the utility model, a fixed connecting piece is fixedly connected to the upper surface of the lower tube, and the number of the fixed connecting pieces is two.

[0009] As a preferred technical solution of the utility model, the mutually adjacent surfaces of the left and right upright forks are commonly fixedly connected with a reinforcing plate, and the shape of the reinforcing plate is a cross.

[0010] As a preferred technical solution of the utility model, a metal ear piece is fixedly connected to the bottom surface of the left flat fork, and two circular openings are formed on the outer surface of the metal ear piece.

[0011] The utility model provides an extrusion-cast rear triangle of an electric bicycle, which has the following beneficial effects:

[0012] The utility model adopts an aluminum alloy extrusion casting process to form the entire rear triangle of the electric bicycle in one piece, thereby further reducing the number of parts. The rear triangle is an integral piece and is easy to install, which saves manpower, thereby further reducing labor costs and further improving work efficiency. Not only does it improve work efficiency, but more importantly, it forms various functional components into one part, making the product more consistent and reducing deformation, thereby improving product quality, facilitating the realization of intelligent assembly of the entire electric power-assisted bicycle, and greatly reducing the cost of after-sales service. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the integral bracket of the utility model;

[0014] Figure 2 It is a three-dimensional structural schematic diagram of the rear tripod of the utility model;

[0015] Figure 3 It is a three-dimensional structural schematic diagram of the front tripod of the utility model;

[0016] Figure 4 It is a three-dimensional structural schematic diagram of the shock absorber body of the utility model.

[0017] In the figure: 1. upper tube; 2. lower tube; 3. bottom bracket; 4. pivot hinge; 5. clamping hole; 6. left fork; 7. left upright fork; 8. right upright fork; 9. shock absorber body; 10. shock absorber front hole; 11. connecting ring; 12. left rear hook; 13. right rear hook; 14. right fork; 15. reinforcing plate; 16. metal ear piece; 17. fixed connecting piece; 18. saddle tube; 19. head tube; 20. connector; 21. front rotating nail; 22. connecting block; 23. rear rotating nail. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figures 1 to 4 The utility model provides a technical solution: an extrusion-cast rear triangle of an electric bicycle, comprising an upper tube 1, the bottom surface of the upper tube 1 is fixedly connected to a lower tube 2, the outer surface of the lower tube 2 is provided with two shock absorber front holes 10, the interiors of the two shock absorber front holes 10 are provided with front rotating nails 21, the ends of the two front rotating nails 21 close to each other are fixedly connected to a connector 20, the right end of the connector 20 is fixedly connected to a shock absorber body 9, the inner wall of the lower tube 2 is hinged with a left flat fork 6 and a right flat fork 14 through a rotating shaft hinge 4, the upper surface of the left flat fork 6 is fixed It is connected to the left vertical fork 7, the upper surface of the right horizontal fork 14 is fixedly connected to the right vertical fork 8, the right end of the left horizontal fork 6 is fixedly connected to the left rear hook 12, the right end of the right horizontal fork 14 is fixedly connected to the right rear hook 13, the left end of the left horizontal fork 6 and the left end of the right horizontal fork 14 are fixedly connected to the connecting ring 11, the outer surfaces of the two connecting rings 11 are provided with a clamping hole 5, the inside of the two clamping holes 5 are provided with a rear rotating nail 23, the ends of the two rear rotating nails 23 close to each other are commonly fixedly connected to a connecting block 22, and the left end of the connecting block 22 is fixedly connected to the right end of the shock absorber body 9.

[0020] Among them, the left end of the upper tube 1 is fixedly connected with the head tube 19, and the outer surface of the lower tube 2 is provided with a bottom bracket 3. By arranging the head tube 19 on the upper tube 1, the head tube 19 is used to install the front fork of the electric power-assisted bicycle, and by opening the bottom bracket 3 on the lower tube 2, the bottom bracket 3 is used to install the middle shaft and the crank chain plate.

[0021] The right end of the upper tube 1 is fixedly connected with a saddle tube 18 , and the outer surface of the saddle tube 18 is provided with two notches. The saddle tube 18 is arranged on the upper tube 1 , and is used to install a seat tube and a seat cushion.

[0022] Among them, the upper surface of the lower tube 2 is fixedly connected with a fixed connecting plate 17, and the number of the fixed connecting plates 17 is two. By arranging two fixed connecting plates 17 on the lower tube 2, it is convenient for the staff to place and install the battery box and the controller between the upper tube 1 and the lower tube 2.

[0023] Among them, the sides of the left fork 7 and the right fork 8 that are close to each other are fixedly connected with a reinforcing plate 15, and the shape of the reinforcing plate 15 is a cross. By arranging the reinforcing plate 15 between the left fork 7 and the right fork 8, the connection between the two can be made stronger.

[0024] The bottom surface of the left flat fork 6 is fixedly connected with a metal ear piece 16, and the outer surface of the metal ear piece 16 is provided with two circular openings. By arranging the metal ear piece 16 under the left flat fork 6, it is convenient for the staff to fix the small components.

[0025] The specific usage and function of this embodiment are as follows:

[0026] The rear triangle is composed of a left fork 6, a right fork 14, a left upright fork 7, a right upright fork 8, a left rear hook 12, a right rear hook 13, a shock absorber rear take-up pair, a bottom bracket 3 and a car ladder take-up pair. The above-mentioned functional components are extruded and cast as a whole by an aluminum alloy extrusion casting process and a special mold to make them into one component, namely the rear triangle. The rear triangle is formed in one step by the extrusion casting process, and there is no need to extrusion cast it into two left and right parts, which are fastened and connected with bolts. The process is: aluminum liquid smelting, aluminum liquid refining, extrusion casting, sawing gate, deburring, T4 treatment, correction, T6 treatment, processing, grinding, phosphating treatment (passivation), inspection, packaging and warehousing.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

[0028] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An extrusion-cast rear triangle of an electric bicycle, characterized in that: The utility model comprises an upper tube (1), the bottom surface of the upper tube (1) is fixedly connected to a lower tube (2), the outer surface of the lower tube (2) is provided with two shock absorber front holes (10), the interior of the two shock absorber front holes (10) is provided with a front rotating nail (21), the ends of the two front rotating nails (21) close to each other are fixedly connected to a connector (20), the right end of the connector (20) is fixedly connected to a shock absorber body (9), the inner wall of the lower tube (2) is hinged with a left flat fork (6) and a right flat fork (14) through a rotating shaft hinge (4), the upper surface of the left flat fork (6) is fixedly connected to a left vertical fork (7), and the right flat fork (14) is fixedly connected to the left vertical fork (7). The upper surface of the left horizontal fork (6) is fixedly connected with a right vertical fork (8), the right end of the left horizontal fork (6) is fixedly connected with a left rear hook (12), the right end of the right horizontal fork (14) is fixedly connected with a right rear hook (13), the left end of the left horizontal fork (6) and the left end of the right horizontal fork (14) are fixedly connected with a connecting ring (11), the outer surfaces of the two connecting rings (11) are provided with a clamping hole (5), the insides of the two clamping holes (5) are provided with a rear rotating nail (23), the ends of the two rear rotating nails (23) close to each other are fixedly connected with a connecting block (22), and the left end of the connecting block (22) is fixedly connected to the right end of the shock absorber body (9).

2. The extrusion-cast rear triangle of an electric bicycle according to claim 1, characterized in that: The left end of the upper tube (1) is fixedly connected to a head tube (19), and the outer surface of the lower tube (2) is provided with a five-way connection (3).

3. The extrusion-cast rear triangle of an electric bicycle according to claim 1, characterized in that: The right end of the upper tube (1) is fixedly connected to a saddle tube (18), and the outer surface of the saddle tube (18) is provided with two notches.

4. The extrusion-cast rear triangle of an electric bicycle according to claim 1, characterized in that: A fixed connecting piece (17) is fixedly connected to the upper surface of the lower tube (2), and the number of the fixed connecting pieces (17) is two.

5. The extrusion-cast rear triangle of an electric bicycle according to claim 1, characterized in that: A reinforcing plate (15) is fixedly connected to the mutually adjacent sides of the left fork (7) and the right fork (8), and the reinforcing plate (15) is in the shape of a cross.

6. The extrusion-cast rear triangle of an electric bicycle according to claim 1, characterized in that: A metal ear piece (16) is fixedly connected to the bottom surface of the left flat fork (6), and two circular openings are formed on the outer surface of the metal ear piece (16).

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