Electric bicycle frame

Abstract

An electric bicycle frame comprises a head tube, an upper tube, a lower tube, a seat tube, a rear fork and a mounting seat, the rear fork comprises an upper rear fork and a lower rear fork, one end of the lower rear fork is hinged to the mounting seat, one end of the upper rear fork is connected with the upper tube through a connecting plate, the other end of the lower rear fork is fixedly connected with the other end of the upper rear fork, one end of the connecting plate is hinged to the upper tube, and the other end of the connecting plate is fixedly connected with the upper tube. The other end of the connecting plate is hinged to the rear upper fork, a first hinge seat is arranged on the upper pipe, a shock absorber is arranged between the connecting plate and the first hinge seat, one end of the shock absorber is hinged to the first hinge seat, and the other end of the shock absorber is hinged to the connecting plate. According to the principle, the shock absorber is basically parallel to the upper tube, the area of a triangular area defined by the upper tube, the lower tube and the seat tube is larger, and battery installation is facilitated; the stress of the shock absorber acts on the upper tube, the stress of a rider acts on the seat tube, the stress of the battery acts on the lower tube, and the stress of the whole frame is more balanced.

Description

Technical Field

[0001] The utility model relates to an electric bicycle, in particular to an electric bicycle frame. Background Art

[0002] The shock absorber of the existing electric bicycle is installed vertically, and the force acts on the seat tube. For example, a new electric bicycle frame with Chinese patent publication number CN213921331U includes a frame front tube, a frame main body tube, a frame seat tube, a motor hanger, a frame rear fork and a shock-absorbing structure. A battery mounting cavity is provided in the frame main body tube, and a mounting surface is provided at the top of the motor hanger. The front end of the mounting surface is connected to the rear end of the frame main body tube, and the middle part of the mounting surface is connected to the bottom end of the frame seat tube. A first hinge seat is provided between the front end and the middle part of the mounting surface, and a second hinge seat is provided on the rear end of the mounting surface; one end of the frame rear fork is hinged to the second hinge seat; the shock-absorbing structure includes a shock-absorbing mounting piece and a shock absorber, the shock-absorbing mounting piece is hinged to the middle part of the frame seat tube, the rear end of the shock-absorbing mounting piece is hinged to the other end of the frame rear fork, the shock absorber is provided between the front end of the shock-absorbing mounting piece and the first hinge seat, and the two ends of the shock absorber are hinged to the front end of the shock-absorbing mounting piece and the first hinge seat. The seat tube of the frame with this structure is subjected to greater force, and due to the necessity of space, the seat tube is bent, so the service life of the seat tube is tested. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide an electric bicycle frame with balanced overall force.

[0004] To solve the above technical problems, the technical solution of the utility model is: an electric bicycle frame, comprising a head tube, an upper tube, a lower tube, a seat tube, a rear fork and a mounting seat, one end of the upper tube is connected to the head tube, the other end of the upper tube is connected to the upper end of the seat tube, one end of the lower tube is connected to the head tube, the other end of the lower tube is connected to the mounting seat, and the lower end of the seat tube is connected to the mounting seat, the rear fork comprises a rear upper fork and a rear lower fork, one end of the rear lower fork is hinged to the mounting seat, one end of the rear upper fork is connected to the upper tube through a connecting plate, the other end of the rear lower fork is fixedly connected to the other end of the rear upper fork, one end of the connecting plate is hinged to the upper tube, and the other end of the connecting plate is hinged to the rear upper fork, a first hinge seat is provided on the upper tube, a shock absorber is provided between the connecting plate and the first hinge seat, one end of the shock absorber is hinged to the first hinge seat, and the other end of the shock absorber is hinged to the connecting plate. The principle of the utility model is as follows: the shock absorber is basically arranged parallel to the upper tube, and the triangular area surrounded by the upper tube, the lower tube and the seat tube is larger, which is conducive to the installation of the battery; the force of the shock absorber acts on the upper tube, the force of the rider acts on the seat tube, and the force of the battery acts on the lower tube, so that the force of the entire frame is more balanced.

[0005] As an improvement, a second hinge seat is provided on the mounting seat, and the rear chain fork is hinged to the mounting seat via the second hinge seat.

[0006] As an improvement, the rear chain fork includes two symmetrically arranged lower fork tubes, the rear seat fork includes two symmetrically arranged upper fork tubes, a total of two connecting plates are provided corresponding to the two upper fork tubes respectively, and the seat tube passes between the two upper fork tubes.

[0007] As an improvement, two symmetrically arranged battery mounting slots are provided on the lower tube.

[0008] Compared with the prior art, the utility model has the following beneficial effects:

[0009] The shock absorber is basically set parallel to the top tube, and the triangular area surrounded by the top tube, down tube and seat tube is larger, which is conducive to battery installation; the force of the shock absorber acts on the top tube, the force of the rider acts on the seat tube, and the force of the battery acts on the down tube, so the force of the entire frame is more balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the frame of the utility model.

[0011] Figure 2 Schematic diagram of the chain stay.

[0012] Figure 3 Schematic diagram of the seat stay. DETAILED DESCRIPTION

[0013] The utility model will be further described below in conjunction with the accompanying drawings.

[0014] like Figures 1 to 3As shown, an electric bicycle frame includes a head tube 7, an upper tube 1, a lower tube 2, a seat tube 3, a rear fork and a mounting seat 6. One end of the upper tube 1 is connected to the head tube 7, and the other end of the upper tube 1 is connected to the upper end of the seat tube 3. In order to make the triangular area surrounded by the upper tube 1, the lower tube 2 and the seat tube 3 larger, the upper tube 1 is bent upward; a first hinge seat 10 is provided at the bottom of the middle part of the upper tube 1, and a third hinge seat 13 is provided at the bottom of one end of the upper tube 1 close to the seat tube 3. One end of the lower tube 2 is connected to the head tube 7, and the other end of the lower tube 2 is connected to the mounting seat 6; two symmetrically arranged battery mounting grooves are provided at the top and bottom of the lower tube 2, and batteries 12 are installed in the battery mounting grooves. Two groups of batteries 12 are used for power supply, and the electric bicycle can cruise longer. The lower end of the seat tube 3 is connected to the mounting seat 6, and the upper end of the seat tube 3 is connected to the saddle after passing through the rear upper fork. The rear fork comprises a rear seat fork 5 and a rear chain fork 4, wherein the rear chain fork 4 comprises two symmetrically arranged lower fork tubes 41, and the rear seat fork 5 comprises two symmetrically arranged upper fork tubes 51, and the seat tube 3 passes between the two upper fork tubes 51. The mounting seat 6 is provided with a second hinge seat 11, one end of the rear chain fork 4 is hinged to the mounting seat 6 through the second hinge seat 11, and the other end of the rear chain fork 4 is fixedly connected to one end of the rear seat fork 5; the other end of the rear seat fork 5 is connected to the upper tube 1 through a connecting plate 8. The connecting plate 8 is L-shaped, and one end of the connecting plate 8 is hinged to the rear upper fork 5. A total of two connecting plates 8 are provided, corresponding to the two upper fork tubes 51 respectively; the other end of the connecting plate 8 is hinged to the upper tube 1 through the third hinge seat 13, and the third hinge seat 13 includes a mounting shaft, and the two connecting plates 8 are hinged at both ends of the mounting shaft; a shock absorber 9 is provided between the connecting plate 8 and the first hinge seat 10, one end of the shock absorber 9 is hinged to the first hinge seat 10, and the other end of the shock absorber 9 is hinged to the turning point of the connecting plate 8.

[0015] Principle of the utility model: the shock absorber is basically arranged parallel to the upper tube 1, and the triangular area surrounded by the upper tube 1, the lower tube 2 and the seat tube 3 is larger, which is conducive to the installation of the battery; the force of the shock absorber acts on the upper tube 1, the force of the rider acts on the seat tube 3, and the force of the battery acts on the lower tube 2, so that the force of the entire frame is more balanced.

Claims

1. An electric bicycle frame, comprising a head tube, an upper tube, a lower tube, a seat tube, a rear fork and a mounting seat, wherein one end of the upper tube is connected to the head tube, the other end of the upper tube is connected to the upper end of the seat tube, one end of the lower tube is connected to the head tube, the other end of the lower tube is connected to the mounting seat, the lower end of the seat tube is connected to the mounting seat, the rear fork comprises a rear upper fork and a rear lower fork, and is characterized in that: One end of the rear lower fork is hinged to the mounting seat, one end of the rear upper fork is connected to the upper tube through a connecting plate, the other end of the rear lower fork is fixedly connected to the other end of the rear upper fork, one end of the connecting plate is hinged to the upper tube, the other end of the connecting plate is hinged to the rear upper fork, a first hinge seat is provided on the upper tube, a shock absorber is provided between the connecting plate and the first hinge seat, one end of the shock absorber is hinged to the first hinge seat, and the other end of the shock absorber is hinged to the connecting plate.

2. The electric bicycle frame according to claim 1, characterized in that: The mounting seat is provided with a second hinge seat, and the rear lower fork is hinged to the mounting seat via the second hinge seat.

3. The electric bicycle frame according to claim 1, characterized in that: The rear lower fork includes two symmetrically arranged lower fork tubes, the rear upper fork includes two symmetrically arranged upper fork tubes, and a total of two connecting plates are provided corresponding to the two upper fork tubes respectively, and the seat tube passes between the two upper fork tubes.

4. The electric bicycle frame according to claim 1, characterized in that: The lower tube is provided with two symmetrically arranged battery mounting slots.

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