WO2017031911A1

WO2017031911A1 - Foldable bicycle frame

Info

Publication number: WO2017031911A1
Application number: PCT/CN2016/000426
Authority: WO
Inventors: 舒秀山
Original assignee: 舒秀山
Priority date: 2015-08-21
Filing date: 2016-08-05
Publication date: 2017-03-02
Also published as: CN105000112A

Abstract

A foldable bicycle frame comprises a front fork assembly (11), a cross beam assembly, a rear wheel support assembly (31, 32, 33), and a saddle assembly (53, 54). The front fork assembly (11) is disposed on a front wheel assembly. The rear wheel support assembly (31, 32, 33) is disposed on a rear wheel assembly. The cross beam assembly, a cross handle assembly disposed on the front fork assembly (11), a saddle assembly (53, 54) disposed on the rear wheel support assembly (31, 32, 33), and a driving and transmission assembly (62, 63) are disposed between the front fork assembly (11) and the rear wheel support assembly (31, 32, 33). In the present invention, by arranging a plurality of X-shaped telescopic mechanisms and a quick-locking device (21), the bicycle frame can be folded after quick-unlocking, and the bicycle frame can be tightly locked after being unfolded; the bicycle frame after being folded has a small size, so that the bicycle has a small size, a light weight and is easy to carry.

Description

Folding bicycle frame

Technical field

The invention relates to the technical field of bicycle frame structures, in particular to a folding bicycle frame.

Background technique

In the prior art, the folding manner of the bicycle folds the bicycle, and the size after folding is still large, which is not suitable for carrying, especially in the case of taking a bus or a subway. With the rapid development of the current economy, the rapid expansion of cities, and the growing problem of traffic congestion, cars are no longer the best means of transportation for citizens. Portable folding bicycles and buses or subways will become a new trend. In order to solve the problem of carrying the bicycle after folding in the prior art, the inventor of the present application proposed a folding bicycle frame based on research experiments for many years.

Summary of the invention

It is an object of the present invention to overcome the deficiencies of the prior art and to provide a folding bicycle frame.

The invention is achieved by the following technical solutions:

A folding bicycle frame includes a front fork riser, a beam assembly, a rear wheel bracket assembly, and a seat assembly; a beam assembly is disposed between the front fork riser and the rear wheel bracket assembly, and is disposed on the rear wheel bracket assembly The seat assembly and the drive and drive assembly for the powertrain.

Preferably, the rear wheel bracket assembly includes a rear wheel bracket, the rear wheel bracket end is provided with a rear fork, the rear fork is fixedly connected with the rear wheel bracket, and the rear fork is provided with a rear wheel fixing device; The assembly adopts a double X-type retracting mechanism, including a first strut, a second strut, a third strut, a fourth strut, a fifth strut, and a sixth strut, and the rear and second branches of the first strut The front end of the rod is hinged, the rear end of the second rod is hinged to the front end of the fifth rod, the rear portion of the fifth rod is hinged to the front end of the sixth rod, and the rear end of the third rod is connected to the fourth rod The front end is hinged, the first pole and the second pole are limited by the first pin shaft, the fifth pole and the sixth pole are limited by the second pin shaft, and the second pole and the third pole pass the first branch The rod shaft is movably connected, and the fourth rod and the fifth rod are movably connected by the second rod shaft, and the front end and the third branch of the first rod The front end of the rod is respectively connected with the front fork riser, and the rear end of the fourth rod and the rear end of the sixth rod are respectively connected with the rear wheel bracket; the seat assembly includes a seat slide tube, a seat riser, and a vehicle The seat body, the seat support plate and the battery, the seat slide tube is fixed by the quick lock device and the rear wheel bracket, and the seat riser is fixed by the quick lock device and the seat slide tube, and the top of the seat riser is provided with a car The seat support plate slides on the seat support plate and is fixed to the seat support plate by the shrink pin and the battery is provided on the lower side of the seat body.

Preferably, the beam assembly adopts a three-X retracting mechanism, including a first strut, a second strut, a third strut, a fourth strut, a fifth strut, and a sixth strut. a seventh pole and an eighth pole, the rear part of the first pole is hinged to the front end of the second pole, the rear end of the second pole is hinged to the front end of the fifth pole, and the rear end of the fifth pole is The front end of the sixth pole is hinged, the rear end of the third pole is hinged to the front end of the fourth pole, the rear end of the fourth pole is hinged to the front end of the seventh pole, and the rear and eighth of the seventh pole are The front end of the strut is hinged, the first strut and the second strut are limited by the first pin shaft, the seventh strut and the eighth strut are constrained by the second pin axle, and the second strut and the third strut pass The first rod shaft is movably connected, the fourth rod and the fifth rod are movably connected by the second rod shaft, and the sixth rod and the seventh rod are movably connected by the third rod shaft, the front end of the first rod The front ends of the third poles are respectively connected with the front fork risers, and the rear ends of the sixth poles and the rear ends of the eighth poles are respectively connected with the rear wheel brackets.

Preferably, the seat assembly adopts an X-type retracting mechanism, including a seat support plate, a first seat support rod, a second seat support rod, a seat body and a battery; the seat support The plate is disposed at an upper end of the rear wheel bracket and is fixedly connected; the front end of the first seat support rod and the rear end of the second seat support rod are respectively movably connected to the seat support plate, and the seat support plate is provided with a hinge hole a transverse groove, and a limit vertical groove or a limiting hole, the front end of the first seat stay or the rear end of the second seat support rod is hinged in the hinge hole, slides in the transverse groove, and is in the limit vertical slot or Limiting the inner limit of the hole; the rear end of the first seat rod and the front end of the second seat rod are respectively movably connected with the seat body, wherein the seat body is provided with a hinge hole, a transverse groove, and a limit vertical slot Or a limiting hole, the rear end of the first seat rod and the front end of the second seat rod are hinged in the hinge hole, slide in the transverse groove, and are limited in the limit vertical slot or the limiting hole, first The seat struts and the second seat struts are movably connected by the seat struts shaft; the lower side of the seat body is provided with a battery.

The drive and transmission assembly includes an ankle transmission and/or a motor assembly; the ankle transmission includes a first stage transmission for transmitting power generated by the pedal, the first stage transmission and the second stage transmission The second stage transmission transmits power to the rotating shaft of the rear wheel; the motor device includes a motor bracket disposed on the rear fork and a motor disposed on the motor bracket.

A folding bicycle frame includes a front fork riser, a beam assembly, a rear wheel bracket assembly, a seat assembly, a drive and transmission assembly; the rear wheel bracket assembly includes a rear wheel bracket, and a rear fork is disposed at a rear end of the rear wheel bracket The rear fork is fixedly connected with the rear wheel bracket, and the rear fork is provided with a rear wheel fixing device; the front fork assembly and the rear wheel bracket assembly are provided with a beam assembly through the sliding sleeve and the seat branch pipe, and are disposed on the beam assembly a seat assembly; the beam assembly adopts a double X-shaped retracting mechanism, including a first strut, a second strut, a third strut, a fourth strut, a fifth strut, a sixth strut, a sliding sleeve, and a car a seat branch pipe, the rear end of the first strut is hinged with the front end of the second strut, the rear end of the second strut is hinged with the front end of the fifth strut, and the rear end of the fifth strut is hinged with the lower end of the lower leg of the seat post And the other end of the lower part of the seat pipe is hinged with the front end of the sixth pole, the rear end of the third pole is hinged with the front end of the fourth pole, and the rear end of the fourth pole is hinged with one end of the sliding sleeve, The second pole and the third pole are movably connected by the first pole shaft, and the fourth pole and the fifth pole The struts are movably connected by the second struts, the front ends of the first struts and the front ends of the third struts are respectively connected with the front fork risers, and the rear ends of the sixth struts are connected with the rear wheel brackets, and the other end of the sliding sleeves Hinged with the upper end of the rear wheel bracket, the sliding sleeve is fixed to the seat bracket by a quick lock device; the seat assembly includes a seat riser, a seat body and a battery, and the seat riser is fastened by a quick lock device The seat pipe is fixed, the seat body is fixed to the upper end of the seat riser, and the battery is provided on the lower side of the seat body.

Preferably, the beam assembly adopts a three-X retracting mechanism, including a first strut, a second strut, a third strut, a fourth strut, a fifth strut, and a sixth strut. a seventh pole, an eighth pole, a sliding sleeve, a seat branch pipe, a rear end of the first pole is hinged to a front end of the second pole, and a rear end of the second pole is hinged to a front end of the fifth pole, The rear end of the five poles is hinged to one end of the lower part of the seat branch pipe, and the other end of the lower part of the seat branch pipe is hinged to the front end of the sixth pole, and the rear end of the third pole is hinged to the front end of the fourth pole, and the fourth The rear end of the strut is hinged with one end of the sliding sleeve, and the other end of the sliding sleeve is hinged with the front end of the seventh strut, the rear end of the seventh strut is hinged with the front end of the eighth strut, and the second strut and the third strut The struts are movably connected by the first struts, the fourth struts and the fifth struts are movably connected by the second struts, and the sixth struts and the seventh struts are movably connected by the third struts, the first branch The front end of the rod and the front end of the third rod are respectively connected with the front fork riser, and the rear end of the sixth rod and the rear end of the eighth rod respectively and the rear wheel branch The frame is connected, and the sliding sleeve is fixed to the seat branch by a quick lock device.

Compared with the prior art, the superior effect of the invention is that the folding frame is applied to the folding bicycle, and the frame is quickly unlocked, folded, unfolded and locked by providing a plurality of X-shaped retracting mechanisms and quick lock devices, and after folding, The small size of the frame makes the bicycle small, lightweight and easy to carry.

DRAWINGS

The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the invention. among them:

1 is a schematic structural view of a first embodiment of a folding bicycle frame according to the present invention;

2 is a schematic structural view of a second embodiment of the folding bicycle frame according to the present invention;

3 is a schematic structural view of a third embodiment of the folding bicycle frame according to the present invention;

4 is a schematic structural view of a fourth embodiment of the folding bicycle frame according to the present invention;

Fig. 5 is a structural schematic view showing a fifth embodiment of the folding bicycle frame of the present invention.

The figures are as follows:

11-Front fork riser, 21-quick lock, 31-rear bracket, 32-rear fork, 33-rear wheel fixture, 411-first pole, 412-second pole, 413-third Rod, 414-fourth rod, 415-fifth rod, 416-sixth rod, 417-seventh rod, 418-eighth rod, 421-first pin shaft, 422-second pin shaft 431-first pole shaft, 432-second pole shaft, 433-third pole shaft, 44-sliding sleeve, 45-seat branch pipe, 51-seat slide pipe, 52-seat standpipe, 53-seat body, 54-seat support plate, 55-battery, 56-first seat struts, 561-seat struts, 57-second seat struts, 62-first stage transmission 63-second stage transmission, 65-motor bracket, 66-motor.

detailed description

The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

Example 1

As shown in Figure 1, a folding bicycle frame includes a front fork riser 11, a beam assembly, a rear wheel bracket assembly, a seat assembly, a drive and transmission assembly; between the front fork riser 11 and the rear wheel bracket assembly A beam assembly is provided, and a seat assembly disposed on the rear wheel bracket assembly, and a drive and transmission assembly for the powertrain.

The rear wheel bracket assembly includes a rear wheel bracket 31, the rear wheel bracket 31 is provided with a rear fork 32, the rear fork 32 is fixedly connected with the rear wheel bracket 31, and the rear fork 32 is provided with a rear wheel fixing device 33; the beam assembly The double X-shaped retracting mechanism comprises a first strut 411, a second strut 412, a third strut 413, a fourth strut 414, a fifth strut 415, a sixth strut 416, and a first strut 411 Rear and second struts 412 The front end is hinged, the rear end of the second strut 412 is hinged to the front end of the fifth strut 415, the rear portion of the fifth strut 415 is hinged to the front end of the sixth strut 416, and the rear end of the third strut 413 is fourth. The front end of the support rod 414 is hinged, the first support rod 411 and the second support rod 412 are limited by the first pin shaft 421, and the fifth support rod 415 and the sixth support rod 416 are limited by the second pin shaft 422. The rod 412 and the third rod 413 are movably connected by the first rod shaft 431, and the fourth rod 414 and the fifth rod 415 are movably connected by the second rod shaft 432. The front end and the third branch of the first rod 411 The front end of the rod 413 is respectively connected to the front fork riser 11, the rear end of the fourth rod 414 and the rear end of the sixth rod 416 are respectively connected with the rear wheel bracket 31; the seat assembly includes a seat slide 51, a seat riser 52, a seat body 53, a seat support plate 54, and a battery 55, the seat slide 51 being fixed to the rear wheel bracket 31 by a quick lock device 21, and the seat riser 52 is passed through the quick lock device 21 The seat slide tube 51 is fixed, and the top end of the seat riser 52 is provided with a seat support plate 54, and the seat body 53 slides on the seat support plate 54 and passes through the contraction pin and the seat support plate. 54 is fixed, and a battery 55 is provided on the lower side of the seat body 53.

The drive and transmission assembly includes an ankle transmission and a motor assembly; the ankle transmission includes a first stage transmission 62 for transmitting power generated by the pedal, the first stage transmission 62 and the second stage transmission 63 mating, and the second stage transmission 63 transmits power to the rotating shaft of the rear wheel; the motor device includes a motor bracket 65 disposed on the rear fork 32, and a motor 66 disposed on the motor bracket 65.

Example 2

As shown in FIG. 2, a folding bicycle frame includes a front fork riser 11, a beam assembly, a rear wheel bracket assembly, a seat assembly, a drive and transmission assembly; the front fork riser 11, a rear wheel bracket assembly, The seat assembly, drive and drive assembly are the same as described in embodiment 1.

The beam assembly adopts a three-X contraction mechanism, including a first strut 411, a second strut 412, a third strut 413, a fourth strut 414, a fifth strut 415, a sixth strut 416, and a seventh a strut 417 and an eighth strut 418, the rear portion of the first strut 411 is hinged to the front end of the second strut 412, the rear end of the second strut 412 is hinged to the front end of the fifth strut 415, and the fifth strut is The rear end of the 415 is hinged to the front end of the sixth strut 416, the rear end of the third strut 413 is hinged to the front end of the fourth strut 414, and the rear end of the fourth strut 414 is hinged to the front end of the seventh strut 417. The rear portion of the seventh strut 417 is hinged with the front end of the eighth strut 418, the first strut 411 and the second strut 412 are limited by the first pin shaft 421, and the seventh strut 417 and the eighth strut 418 are used. The second pin 422 is limited, and the second rod 412 and the third rod 413 pass the first rod shaft 431 is movably connected, the fourth strut 414 and the fifth strut 415 are movably connected by the second strut shaft 432, and the sixth strut 416 and the seventh strut 417 are movably connected by the third strut shaft 433, the first strut The front end of the 411 and the front end of the third strut 413 are respectively connected to the front fork riser 11, and the rear end of the sixth strut 416 and the rear end of the eighth strut 418 are respectively connected to the rear wheel bracket 31.

When folding, first release the quick lock device 21 and other lock device, and then fold the beam assembly and the seat assembly.

Example 3

As shown in FIG. 3, a folding bicycle frame includes a front fork riser 11, a beam assembly, a rear wheel bracket assembly, a seat assembly, a drive and transmission assembly; wherein the front fork riser 11, the beam assembly, The rear wheel bracket assembly, drive and transmission assembly are the same as described in the first embodiment.

The seat assembly adopts an X-type retracting mechanism, including a seat support plate 54, a first seat stay 56, a second seat support 57, a seat body 53 and a battery 55; the seat support plate 54 is disposed The upper end of the rear wheel bracket 31 is fixedly connected; the front end of the first seat stay 56 and the rear end of the second seat support 57 are respectively movably connected to the seat support plate 54, and the seat support plate 54 is internally provided. There are hinge holes, lateral grooves, and limit vertical slots or limit holes, and the front end of the first seat stay 56 or the rear end of the second seat rod 57 is hinged in the hinge hole and slides in the transverse groove. The limit of the limit vertical slot or the limit hole; the rear end of the first seat stay 56 and the front end of the second seat support 57 are respectively movably connected to the seat body 53, and the seat body 53 is provided with a hinge hole , the transverse groove, and the limit vertical groove or the limiting hole, the rear end of the first seat stay 56 and the front end of the second seat support 57 are hinged in the hinge hole, slide in the horizontal groove, and stand in the limit position. In the slot or the limiting hole, the first seat stay 56 and the second seat rod 57 are movably connected by the seat rod shaft 561; the lower side of the seat body 53 is provided with a battery 55.

Example 4

As shown in FIG. 4, a folding bicycle frame includes a front fork riser 11, a beam assembly, a rear wheel bracket assembly, a seat assembly, a drive and transmission assembly; the rear wheel bracket assembly includes a rear wheel bracket 31, rear The rear end of the wheel bracket 31 is provided with a rear fork 32. The rear fork 32 is fixedly connected with the rear wheel bracket 31. The rear fork 32 is provided with a rear wheel fixing device 33. The front fork riser and the rear wheel bracket assembly pass through the sliding sleeve 44. And the seat tube 45 is provided with a beam assembly and a seat assembly disposed on the beam assembly; the beam assembly adopts a double X type The contraction mechanism comprises a first strut 411, a second strut 412, a third strut 413, a fourth strut 414, a fifth strut 415, a sixth strut 416, a sliding sleeve 44, a seat bracket 45, The rear end of one rod 411 is hinged to the front end of the second rod 412, the rear end of the second rod 412 is hinged to the front end of the fifth rod 415, and the rear end of the fifth rod 415 is lower than the lower portion of the seat branch 45. One end is hinged, and the other end of the lower portion of the seat leg 45 is hinged to the front end of the sixth strut 416, the rear end of the third strut 413 is hinged to the front end of the fourth strut 414, and the rear end of the fourth strut 414 is sliding. One end of the sleeve 44 is hinged, the second rod 412 and the third rod 413 are movably connected by the first rod shaft 431, and the fourth rod 414 and the fifth rod 415 are movably connected by the second rod shaft 432, first The front end of the strut 411 and the front end of the third strut 413 are respectively connected to the front fork riser 11, the rear end of the sixth strut 416 is connected to the rear wheel bracket 31, and the other end of the sliding sleeve 44 and the upper end of the rear wheel bracket 31 are connected. Hinged, the sliding sleeve 44 is fixed to the seat leg 45 by a quick lock device 21; the seat assembly includes a seat riser 52, a seat body 53 and a battery 55, the stand 52 quick-lock means 21 and the branch tube 45 is fixed to the seat, the seat body 53 and the seat 52 fixed to the upper end of the riser, the lower side of the seat body 53 is provided with a battery 55.

Example 5

As shown in FIG. 5, a folding bicycle frame includes a front fork riser 11, a beam assembly, a rear wheel bracket assembly, a seat assembly, a drive and transmission assembly; the front fork riser 11, a rear wheel bracket assembly, The seat assembly, drive and drive assembly are the same as described in embodiment 4.

The beam assembly adopts a three-X contraction mechanism, including a first strut 411, a second strut 412, a third strut 413, a fourth strut 414, a fifth strut 415, a sixth strut 416, and a seventh a strut 417, an eighth strut 418, a sliding sleeve 44, a seat leg 45, a rear end of the first strut 411 is hinged to a front end of the second strut 412, and a rear end of the second strut 412 and a fifth strut The front end of the 415 is hinged, the rear end of the fifth strut 415 is hinged to one end of the lower portion of the seat leg 45, and the other end of the lower portion of the seat leg 45 is hinged to the front end of the sixth strut 416, and the rear end of the third strut 413 Hinged to the front end of the fourth strut 414, the rear end of the fourth strut 414 is hinged to one end of the sliding sleeve 44, and the other end of the sliding sleeve 44 is hinged to the front end of the seventh strut 417, behind the seventh strut 417 The end is hinged to the front end of the eighth strut 418, the second strut 412 and the third strut 413 are movably connected by the first strut shaft 431, and the fourth strut 414 and the fifth strut 415 pass the second strut shaft 432. The movable connection, the sixth strut 416 and the seventh strut 417 are movably connected by the third strut shaft 433, The front end of the first rod 411 and the front end of the third rod 413 are respectively connected to the front fork riser 11, and the rear end of the sixth rod 416 and the rear end of the eighth rod 418 are respectively connected to the rear wheel bracket 31, The sliding sleeve 44 is fixed to the seat branch pipe 45 by the quick lock device 21.

The present invention is not limited to the above-described embodiments, and any variations, modifications, and alterations that may be conceived by those skilled in the art are intended to fall within the scope of the present invention without departing from the spirit of the invention.

Claims

A folding bicycle frame comprising a front fork riser, a beam assembly, a rear wheel bracket assembly, and a seat assembly; wherein a beam assembly is disposed between the front fork riser and the rear wheel bracket assembly, and is disposed behind A seat assembly on the wheel bracket assembly, and a drive and drive assembly for the powertrain.
The folding bicycle frame according to claim 1, wherein the rear wheel bracket assembly comprises a rear wheel bracket, the rear wheel bracket end is provided with a rear fork, the rear fork is fixedly connected with the rear wheel bracket, and the rear fork is provided with a rear wheel fixing device; the beam assembly adopts a double X-shaped retracting mechanism, including a first strut, a second strut, a third strut, a fourth strut, a fifth strut, and a sixth strut, the first branch The rear portion of the rod is hinged to the front end of the second strut, the rear end of the second strut is hinged to the front end of the fifth strut, the rear portion of the fifth strut is hinged to the front end of the sixth strut, and the third strut is hinged The rear end is hinged with the front end of the fourth pole, the first pole and the second pole are limited by the first pin, the fifth pole and the sixth pole are limited by the second pin, and the second pole is The third rod is movably connected by the first rod shaft, and the fourth rod and the fifth rod are movably connected by the second rod shaft, the front end of the first rod and the front end of the third rod respectively and the front fork riser Connecting, the rear end of the fourth pole and the rear end of the sixth pole are respectively connected with the rear wheel bracket; the seat assembly includes a seat slide tube The seat riser, the seat body, the seat support plate and the battery, the seat slide tube is fixed by the quick lock device and the rear wheel bracket, and the seat riser is fixed by the quick lock device and the seat slide tube, and the seat base is fixed The top end of the tube is provided with a seat support plate, the seat body slides on the seat support plate, and is fixed to the seat support plate by a retractable pin shaft, and a battery is arranged on the lower side of the seat body.
The folding bicycle frame according to claim 1, wherein said beam assembly employs a three-X retracting mechanism, including a first strut, a second strut, a third strut, a fourth strut, and a fifth a strut, a sixth strut, a seventh strut, and an eighth strut, wherein a rear portion of the first strut is hinged to a front end of the second strut, and a rear end of the second strut is hinged to a front end of the fifth strut The rear end of the fifth pole is hinged to the front end of the sixth pole, the rear end of the third pole is hinged to the front end of the fourth pole, and the rear end of the fourth pole is hinged to the front end of the seventh pole, and the seventh The rear part of the strut is hinged with the front end of the eighth strut, the first strut and the second strut are limited by the first pin shaft, and the seventh strut and the eighth strut are constrained by the second pin axle, the second The struts and the third struts are movably connected by the first struts, the fourth struts and the fifth struts are movably connected by the second struts, and the sixth struts and the seventh struts are moved by the third struts Connecting, the front end of the first pole and the front end of the third pole are respectively connected with the front fork riser, the rear end of the sixth pole and the rear end of the eighth pole respectively and the rear wheel Rack connection.
A folding bicycle frame according to claim 1 wherein said seat assembly is The X-type contraction mechanism comprises a seat support plate, a first seat support rod, a second seat support rod, a seat body and a battery; the seat support plate is disposed at an upper end of the rear wheel bracket and is fixedly connected; The front end of the first seat support rod and the rear end of the second seat support rod are respectively movably connected with the seat support plate, and the seat support plate is provided with a hinge hole, a transverse groove, and a limit vertical groove or a limit hole. The front end of the first seat post or the rear end of the second seat post is hinged in the hinge hole, slides in the transverse groove, and is limited in the limit vertical slot or the limit hole; the first seat support rod The front end of the rear seat and the second seat rod are respectively movably connected to the seat body, and the seat body body is provided with a hinge hole, a horizontal groove, and a limit vertical groove or a limit hole, and the rear end of the first seat support rod The front end of the second seat rod is hinged in the hinge hole, slides in the horizontal groove, and is limited in the limit vertical slot or the limit hole, and the first seat rod and the second seat rod pass through the vehicle. The seat rod shaft is movably connected; a battery is arranged on the lower side of the seat body.
A folding bicycle frame according to claim 1 wherein said drive and transmission assembly includes an ankle drive and/or an electric motor; said ankle transmission includes a first means for transmitting power generated by the ankle a first-stage transmission, the first-stage transmission cooperates with the second-stage transmission, and the second-stage transmission transmits power to the rotating shaft of the rear wheel; the motor device includes a motor bracket disposed on the rear fork, and the motor The motor set on the bracket.
A folding bicycle frame includes a front fork riser, a beam assembly, a rear wheel bracket assembly, a seat assembly, a drive and transmission assembly; wherein the rear wheel bracket assembly includes a rear wheel bracket, and the rear wheel bracket end is provided There is a rear fork, the rear fork is fixedly connected with the rear wheel bracket, and the rear fork is provided with a rear wheel fixing device; the front fork riser and the rear wheel bracket assembly are provided with a beam assembly through the sliding sleeve and the seat branch pipe, and a seat assembly on the beam assembly; the beam assembly adopts a double X-shaped retracting mechanism, including a first strut, a second strut, a third strut, a fourth strut, a fifth strut, and a sixth strut a sliding sleeve and a seat branch pipe, the rear end of the first pole is hinged to the front end of the second pole, the rear end of the second pole is hinged to the front end of the fifth pole, and the rear end of the fifth pole is opposite to the seat One end of the lower part of the branch pipe is hinged, and the other end of the lower part of the seat branch pipe is hinged with the front end of the sixth strut, the rear end of the third strut is hinged with the front end of the fourth strut, and the rear end of the fourth strut and the sliding sleeve are One end is hinged, and the second pole and the third pole are movably connected through the first pole shaft, fourth The struts and the fifth struts are movably connected by the second struts, the front ends of the first struts and the front ends of the third struts are respectively connected with the front fork risers, and the rear ends of the sixth struts are connected with the rear wheel brackets. The other end of the sliding sleeve is hinged with the upper end of the rear wheel bracket, and the sliding sleeve is fixed to the seat bracket by a quick lock device; the seat assembly includes a seat riser, a seat body and a battery, and the seat riser The seat body is fixed by the quick lock device and the seat branch pipe It is fixed to the upper end of the seat riser, and a battery is provided on the lower side of the seat body.
The folding bicycle frame according to claim 4, wherein the beam assembly adopts a three-X retracting mechanism, including a first strut, a second strut, a third strut, a fourth strut, and a fifth a strut, a sixth strut, a seventh strut, an eighth strut, a sliding sleeve, a seat branch pipe, a rear end of the first strut is hinged to a front end of the second strut, and a rear end of the second strut is The front end of the five poles is hinged, the rear end of the fifth pole is hinged to one end of the lower part of the seat bracket, and the other end of the lower part of the seat bracket is hinged to the front end of the sixth pole, and the rear end of the third pole is fourth. The front end of the strut is hinged, the rear end of the fourth strut is hinged to one end of the sliding sleeve, and the other end of the sliding sleeve is hinged to the front end of the seventh strut, and the rear end of the seventh strut is hinged to the front end of the eighth strut The second pole and the third pole are movably connected by the first pole shaft, the fourth pole and the fifth pole are movably connected by the second pole shaft, and the sixth pole and the seventh pole pass the third branch The rod shaft is movably connected, the front end of the first strut and the front end of the third strut are respectively connected with the front fork riser, and the rear end of the sixth strut, Eight rear struts are connected to the rear bracket, said sleeve tube secured by quick-locking means of the seat support.