Bicycle frame

Abstract

The utility model discloses a bicycle frame, include: be used to install the front fork of front wheel, be used to connect the head pipe of handle, main beam, middle pipe, lower pipe and be used to install the flat fork of rear wheel, the lower extreme of head pipe is connected with the upper end of front fork through the vertical pipe cover, the front end of main beam is fixedly connected with head pipe, and the rear end of main beam is fixedly connected with the upper end of middle pipe, the upper end of lower pipe is fixedly connected with main beam to the forward inclination, and the lower end of lower pipe is fixedly connected with the five -way pipe of installing footboard, the rear end of five -way pipe is welded fixedly with the lower end of middle pipe, and middle pipe passes through flat fork, and both sides of the lower end of middle pipe are fixedly connected with flat fork, the front end of flat fork is welded fixedly with lower pipe, and flat fork is inclined upward to relative horizontal surface, the utility model discloses the front end of flat fork is inclined upward and is fixed on lower pipe, so can disperse stress, form multiple triangle structure, make the whole rigidity of car frame better, and the stability is strong, and the driving is more comfortable, and flat fork can design longer, and install bigger wheel.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and in particular to a bicycle frame. Background Technology

[0002] Existing folding bicycle frames are generally divided into transverse folding and longitudinal folding. However, existing transverse folding bicycle frames typically fold by installing a folding box on the main beam. In this type of frame, the rear swingarm is usually horizontally connected to the bottom tube where the seat is mounted. This creates a triangular structure where the bottom tube, main beam, swingarm, and down tube connect, forming a bottom bracket at the pedal mounting point. Because of this connection point, the frame's center of gravity is concentrated at the bottom bracket, resulting in concentrated stress, insufficient overall rigidity, poor stability, and a less comfortable ride.

[0003] Therefore, improvements to existing technologies are still needed. Utility Model Content

[0004] The purpose of this utility model is to provide a bicycle frame that addresses the technical problems of insufficient overall rigidity and inadequate stability of existing bicycle frames.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: a bicycle frame, comprising: a front fork for mounting the front wheel, a head tube for connecting the handlebars, a main beam, a middle tube, a down tube, and a swingarm for mounting the rear wheel; the lower end of the head tube is connected to the upper end of the front fork via a vertical tube sleeve; the front end of the main beam is fixedly connected to the head tube, and the rear end of the main beam is fixedly connected to the upper end of the middle tube; the upper end of the down tube is inclined forward and fixedly connected to the main beam, and the lower end of the down tube is fixedly connected to the bottom bracket tube for mounting the pedals; the lower end of the middle tube is welded and fixedly connected to the rear end of the bottom bracket tube, and the middle tube passes through the swingarm, with both sides of the lower end of the middle tube respectively connected and fixedly connected to the swingarm; the front end of the swingarm is welded and fixedly connected to the down tube, and the swingarm is inclined upward relative to the horizontal plane.

[0006] The bicycle frame, wherein the angle between the flat fork and the horizontal plane is 10-30 degrees.

[0007] The bicycle frame described herein includes a front dropout at the bottom of the front fork and a disc brake attachment at the lower end of the front fork.

[0008] The bicycle frame described herein includes a rear dropout at the rear end of the flat fork, and a disc brake attachment is installed in front of the rear dropout.

[0009] The bicycle frame, wherein the flat fork has an arc-shaped groove in the middle for easy installation of the wheel.

[0010] The bicycle frame, wherein the flat fork is composed of two elliptical tubes, and the inner sides of the two elliptical tubes are respectively provided with arc-shaped grooves.

[0011] The bicycle frame, wherein the bottom of the flat fork is further fitted with a bridge plate, and a footrest can be fitted at the bottom of the bridge plate.

[0012] The bicycle frame described herein, wherein the head tube is foldable via a vertical tube sleeve.

[0013] The bicycle frame includes a folding box installed in the middle of the main beam, through which the main beam can be folded laterally, and the handlebar buckle of the folding box is located on the right side of the main beam.

[0014] The bicycle frame is described in which the cross-sections of the main beam, center tube, head tube, fork, and down tube are elliptical, and cable guides are installed at the bottom of the main beam, center tube, and fork.

[0015] Beneficial effects: The front end of the swingarm of this utility model is tilted upward and fixed on the downtube, so it can distribute the force and form multiple triangular structures, which makes the overall frame more rigid, more stable, and more comfortable to ride. The swingarm can be designed to be longer and larger wheels can be installed. Attached Figure Description

[0016] Figure 1 This is a side view of the present invention.

[0017] Figure 2 This is a side view of the present invention after it has been folded.

[0018] Figure 3 This is a side view of the present invention after the wheels are installed.

[0019] Figure 4 This is a bottom view of the flat fork in this utility model.

[0020] Figure 5 This is a cross-sectional view of the elliptical tube of this utility model. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer and more explicit, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1-5As shown, this utility model discloses a bicycle frame, including: a front fork 1 for mounting the front wheel, a head tube 2 for connecting the handlebars, a main beam 3, a middle tube 4, a bottom tube 5, and a swingarm 6 for mounting the rear wheel; the lower end of the head tube 2 is connected to the upper end of the front fork 1 through a vertical tube sleeve 7; the front end of the main beam 3 is fixedly connected to the head tube 2, and the rear end of the main beam 3 is fixedly connected to the upper end of the middle tube 4; the upper end of the bottom tube 5 is inclined forward and fixedly connected to the main beam 3, and the lower end of the bottom tube 5 is fixedly connected to the bottom bracket tube 8 for mounting the pedals; the lower end of the middle tube 4 is welded and fixed to the rear end of the bottom bracket tube 8, and the middle tube 4 passes through the swingarm 6, with both sides of the lower end of the middle tube 4 connected and fixedly connected to the swingarm 6; the front end of the swingarm 6 is welded and fixed to the bottom tube 5, and the swingarm 6 is inclined upward relative to the horizontal plane.

[0023] With the above structure, this invention, due to the upward-sloping front end of the swingarm welded and fixed to the downtube, can distribute the stress on the frame, creating multiple triangular structures at the intersections of the main beam, downtube, center tube, and swingarm. This results in better frame stability and increased rigidity. Furthermore, due to the angled design of the swingarm, it can be designed to be longer according to national bicycle safety standards, further enhancing frame stability and ride comfort. The longer swingarm also allows for the installation of larger wheels. Traditional bicycle frames have shorter swingarms, resulting in less rear spread and making it impossible to install large wheels or kickstands, as the kickstand's installation is affected by pedal rotation.

[0024] The flat fork connection structure of this utility model meets the rigidity test standard, and the length of the flat fork can be 40-50mm longer than the length of the existing flat fork.

[0025] Preferably, the angle between the horizontal fork 6 and the horizontal plane is 10-30 degrees, so the horizontal fork can be designed to be longer and have a greater opening at the rear, allowing the frame to install larger wheels.

[0026] Preferably, the bottom end of the front fork 1 is provided with a front dropper 10, and the lower end of the front fork 10 is also equipped with a disc brake attachment 9, so the front wheel can be installed through the front dropper.

[0027] Preferably, the rear end of the flat fork 6 is provided with a rear dropout 12, and a disc brake attachment 9 is also installed in front of the rear dropout 12; therefore, the rear wheel can be installed through the rear dropout.

[0028] Preferably, the flat fork 6 has an arc-shaped groove 60 in the middle to facilitate the installation of wheels, so that larger wheels can be installed and the wheels will not scrape against the flat fork when rotating.

[0029] Preferably, the flat fork 6 is composed of two elliptical tubes 61, and the inner sides of the two elliptical tubes are respectively provided with arc-shaped grooves.

[0030] Preferably, a bridge plate 13 is also installed at the bottom of the flat fork 9, and a foot support can be installed at the bottom of the bridge plate 13. Since the flat fork can be designed to be long, the bridge plate is installed at the bottom of the flat fork, and the foot support is installed at the bottom of the bridge plate, so that the foot support will not affect the rotation of the pedal.

[0031] Preferably, the first tube 2 can be folded through the vertical tube sleeve 7.

[0032] Preferably, a folding box 14 is installed in the middle of the main beam 3, and the main beam 3 can be folded laterally through the folding box 14, and the buckle of the folding box 14 is located on the right side of the main beam 3.

[0033] Preferably, the cross-sections of the main beam 3, middle tube 4, front tube 2, front fork 1 and lower tube 5 are elliptical, and the bottom of the main beam 3, middle tube 4 and horizontal fork 6 are equipped with wire guides 15.

[0034] The front end of the swingarm of this invention is tilted upward and fixed on the downtube, so it can distribute the force and form multiple triangular structures, which makes the overall frame more rigid, more stable, and more comfortable to ride. The swingarm can be designed to be longer and can be fitted with larger wheels.

[0035] The above are merely preferred embodiments of this utility model, and should not be construed as limiting the scope of this utility model. It should be noted that for those skilled in the art, any modifications or equivalent substitutions to the technical solution of this utility model without creative effort do not depart from the protection scope of this utility model.

Claims

1. A bicycle frame, comprising: The bicycle comprises a front fork for mounting the front wheel, a head tube, a main beam, a middle tube, a down tube for connecting the handlebars, and a swingarm for mounting the rear wheel; the lower end of the head tube is connected to the upper end of the front fork via a vertical tube sleeve; the front end of the main beam is fixedly connected to the head tube, and the rear end of the main beam is fixedly connected to the upper end of the middle tube; the upper end of the down tube is tilted forward and fixedly connected to the main beam, and the lower end of the down tube is fixedly connected to the bottom bracket tube for mounting the pedals; characterized in that the lower end of the middle tube is welded and fixed to the rear end of the bottom bracket tube, and the middle tube passes through the swingarm, with both sides of the lower end of the middle tube respectively connected and fixed to the swingarm; the front end of the swingarm is welded and fixed to the down tube, and the swingarm is tilted upward relative to the horizontal plane.

2. The bicycle frame according to claim 1, characterized in that, The angle between the horizontal fork and the horizontal plane is 10-30 degrees.

3. The bicycle frame according to claim 2, characterized in that, The front fork has a front dropout at the bottom and a disc brake attachment at the bottom.

4. The bicycle frame according to claim 1, characterized in that, The rear end of the swingarm is equipped with a rear dropout, and a disc brake attachment is installed in front of the rear dropout.

5. The bicycle frame according to claim 1, characterized in that, The horizontal fork has an arc-shaped groove in the middle to facilitate the installation of wheels.

6. The bicycle frame according to claim 5, characterized in that, The flat fork is composed of two elliptical tubes, and the inner sides of the two elliptical tubes are respectively provided with arc-shaped grooves.

7. The bicycle frame according to claim 6, characterized in that, The bottom of the fork is also equipped with a bridge plate, and a foot support can be installed at the bottom of the bridge plate.

8. The bicycle frame according to claim 1, characterized in that, The head tube can be folded through the vertical tube sleeve.

9. The bicycle frame according to claim 1, characterized in that, A folding box is installed in the middle of the main beam, which allows the main beam to be folded laterally, and the handle of the folding box is located on the right side of the main beam.

10. The bicycle frame according to claim 1, characterized in that, The main beam, middle tube, head tube, front fork, and lower tube have elliptical cross sections, and guide wire seats are installed at the bottom of the main beam, middle tube, and horizontal fork.

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