CN211685462U - Bicycle with a wheel - Google Patents

Abstract

The utility model provides a bicycle: the pipe wall of the tubular structure is composed of a plurality of layers of laminated structures, each laminated structure comprises at least three carbon fiber layers and at least two layers of PMI films, the carbon fiber layers are respectively arranged on the inner side and the outer side of each layer of PMI film, and the basal layer and the skin layer of the pipe wall are both carbon fiber layers; the bicycle includes a frame that includes a tubular structure. In the pipe wall of the tubular structure, the PMI film with excellent mechanical property plays a role in supporting and reinforcing the carbon fiber layer, so that the tubular structure has high tensile resistance, pressure resistance, specific rigidity, specific strength and corrosion resistance. The frame with the tubular structure has high strength and toughness, can bear large load and impact force, and is not easy to break. In addition, the material of tubular structure is carbon fiber and PMI, can not take place the corrosion. Generally speaking, the utility model discloses a bicycle can provide safe, steady and light riding experience.

Description

Bicycle with a wheel

Technical Field

The utility model belongs to the sport equipment field specifically, relates to a bicycle.

Background

With the enhancement of environmental awareness of people, bicycle traveling gradually becomes a common traveling traffic mode. Meanwhile, bicycle sports is also a very popular competitive sport, and the bicycle industry is also continuously improving each part of the bicycle to meet the requirements of users. Among them, the bicycle frame is one of the main components of the bicycle. The pipe material of the bicycle frame is developed from the earliest chromium molybdenum steel material to an aluminum alloy, a titanium alloy, a magnesium alloy and a scandium alloy material, and then a composite material is applied, and the chromium molybdenum steel has the advantages of good processing performance, high strength and the like, but has the insurmountable defects of heavy weight and easy rusting. Compared with the chromium-molybdenum steel material, the aluminum alloy material can be used for manufacturing the frame with light weight, but the aluminum alloy has insufficient hardness and is easy to oxidize, and the titanium alloy, the magnesium alloy and the scandium alloy material have too high production and processing costs and are not the best material for manufacturing the bicycle middle tube.

The carbon fiber is a special fiber consisting of carbon elements and has the characteristics of high temperature resistance, friction resistance, electric conduction, heat conduction, corrosion resistance and the like. The carbon fiber is fibrous and soft, and may be produced into various kinds of fabric, and has graphite microcrystal structure with preferred orientation along fiber axis and thus high strength and modulus along fiber axis direction. The carbon fibers have a low density and thus a high specific strength and a high specific modulus. Carbon fibers have the advantages of light weight, no bending, good impact absorption, and the like, but also have the disadvantages of poor surface hardness and high cost, and can cause breakage when subjected to external force higher than the maximum sustainable breaking strength.

Polymethacrylimide foam (PMI) is a cross-linked foam with a uniform pore size distribution, excellent structural stability and high mechanical strength. PMI has higher specific strength, specific modulus, heat and humidity resistance, and better high temperature creep resistance and dimensional stability than other polymer foam materials. PMI is the foam material with the highest specific strength (strength/density) and specific modulus (modulus/density) in the world at present, has excellent high-temperature resistance and dimensional stability, and is an ideal core material for manufacturing the light-weight high-strength composite material pipe wall. In addition, because the PMI has high closed pore rate, uniform pore size distribution and low moisture absorption rate, the sandwich composite material as the core material has durability and environmental resistance which are far superior to those of a honeycomb composite material.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a bicycle to solve at least one among the technical problem that prior art exists.

According to an aspect of the present invention, there is provided a bicycle: the pipe wall of the tubular structure is composed of a plurality of layers of laminated structures, each laminated structure comprises at least three carbon fiber layers and at least two layers of PMI films, the carbon fiber layers are respectively arranged on the inner side and the outer side of each layer of PMI film, and the basal layer and the skin layer of the pipe wall are both carbon fiber layers; the bicycle includes a frame that includes a tubular structure.

All hollow bodies with hollow cavities all belong to the tubular structure of the utility model. In the pipe wall of the tubular structure, the PMI film and the carbon fiber layer are compounded to form a multilayer sandwich structure, the PMI film with excellent mechanical property plays a role in supporting and reinforcing the carbon fiber layer, so that the tubular structure has high tensile resistance, pressure resistance, specific rigidity, specific strength and corrosion resistance. The frame with the tubular structure has high strength and toughness, can bear large impact and load, and is not easy to break. The bicycle comprising the frame has high durability and safety. In addition, the tubular structure is carbon fiber and PMI, can not take place the corrosion, and moreover, tubular structure is hollow structure, can make the bicycle automobile body keep light and handy, has higher controllability, can make the resistance that automobile body self produced in the motion process keep in lower scope.

Preferably, the PMI film is made of 100% PMI.

Preferably, the thickness of the PMI film does not exceed 1 mm.

The PMI film with the thickness not more than 1mm has certain crimpability at normal temperature, and the PMI film is used as a core layer material for preparing the pipe wall, so that the PMI film can be directly compounded on the outer side of the base material by adhering the outline of the base material, and the parts comprising the tubular structure of the frame can be conveniently manufactured in batches. In addition, compared with the compounding between thick plates, the compounding of the thin layers has larger interlayer binding force, the interlayer binding is tighter, the delamination is not easy to happen, and the integration and the mechanical property of the tubular structure are improved. In the pipe wall of the tubular structure, the thickness of each layer of PMI film is smaller, so that the frame can have greater mechanical strength in the form of compounding multiple layers of PMI films.

Optionally, the PMI film is directly wrapped around the carbon fiber layer on the inner side thereof.

Optionally, the PMI film is helically wound around the periphery of its inner carbon fiber layer.

Optionally, the texture of the carbon fiber layer is helical.

The material for constructing the layered structure forms the layered structure in a spiral winding mode, can adapt to the manufacturing requirements of special-shaped tubular structures of different parts, and all the layered structures forming the pipe wall can be tightly compounded with each other without dead angles or gaps.

Optionally, the grains of two adjacent layers of the layered structure are mutually crossed. Therefore, adjacent layered structures jointly form a staggered net-shaped structure, the stress of the net-shaped structure is uniform, and the pressure resistance of the tubular structure can be improved.

Preferably, the frame comprises a front frame, a front fork and a rear fork; the front frame, the front fork and the rear fork are all formed by tubular structures; the front frame is communicated with the front fork and the rear fork.

Preferably, the front frame and the front fork are integrally formed. That is, there is no gap at the bent portion of the front frame and the joint between the front frame and the front fork, so that stress concentration at the joint due to formation of the gap is avoided, and the front frame and the front fork have higher mechanical strength and are not easily broken.

Preferably, the wire-guiding device also comprises a plurality of wire-guiding holes for the wires to pass through; the frame comprises a head pipe, an upper pipe, a lower pipe and a vertical pipe, wherein two ends of the upper pipe and the lower pipe are respectively provided with a wiring hole.

Preferably, the device further comprises a handle, wherein the handle is formed by a tubular structure and is communicated with the head pipe; two ends of the handle are respectively provided with a wiring hole; a group of wiring holes are arranged on the head tube, and are symmetrically distributed on the surface of the head tube relative to the plane of the front wheel of the bicycle.

The wiring holes are formed in the corresponding positions of the tubular structures of the bicycle body, so that the wiring of the hollow inner cavity of the tubular structures can be reasonably utilized, the integration degree and the visual aesthetic feeling of the bicycle body of the bicycle are improved, and the condition that the riding comfort is reduced due to the fact that the control wires are exposed is avoided. In addition, the pipe wall of the tubular structure plays a role in protecting the control line, so that the aging of the control line is effectively slowed down, and the control line has longer service life.

Preferably, the device further comprises spokes, and the spokes are formed by tubular structures. Therefore, the spoke has higher strength, can provide reliable support for the wheel frame to ensure that the wheel frame is not easy to deform and has higher transmission capacity. In addition, the spokes are lighter in weight, thus reducing power consumption and physical effort consumption of the user.

Drawings

FIG. 1 is a layered structure diagram of the wall of a tubular structure;

FIG. 2 is a perspective view of the handle;

FIG. 3 is a perspective view of the front fork and frame being integrally formed;

fig. 4 is an overall structural schematic view of the bicycle of embodiment 1.

The correspondence of each reference numeral in the above figure is as follows: the bicycle comprises a PMI film layer, a carbon fiber layer, a front frame, a head tube, an upper tube, a lower tube, a vertical tube, a front fork, a rear upper fork, a rear lower fork, a handle, a grip part, a connecting rod and spokes, wherein the PMI film layer is 2, the carbon fiber layer is 3, the front frame is 31, the head tube is 32, the upper tube is 33, the lower tube is 34, the vertical tube is 4, the front fork is 5, the.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, back, horizontal, vertical … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly. In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Example 1

The tubular structure according to this example was prepared as follows:

s1, coating a release agent on the surface of a tube core mould, attaching the surface of the tube core mould, and winding the tube core mould by using carbon fibers to construct a first carbon fiber layer 2 serving as a substrate layer of a tube wall;

s2. extension of sandwich structure

S2.1, coating resin on the surface of a carbon fiber layer 2 serving as a substrate layer, and winding the carbon fiber layer on the periphery of the substrate layer to construct 2 carbon fiber layers 2 on the periphery of the substrate layer;

s2.2, coating resin on the surface of the outermost carbon fiber layer 2 of the semi-finished product prepared in the previous step, adhering and winding a PMI film on the periphery of the carbon fiber layer 2, and constructing 1 PMI film layer 1 on the periphery of the outermost carbon fiber layer 2 of the semi-finished product, wherein the formed PMI film layer 1 has spiral lines;

s2.3, coating resin on the surface of the outermost PMI film layer 1 of the semi-finished product prepared in the previous step, and adhering and winding carbon fibers on the periphery of the PMI film layer 1, so that 1 carbon fiber layer 2 is built on the periphery of the semi-finished product;

s2.4 repeating S2.2-S2.3 three times;

s3, coating resin on the surface of the outermost carbon fiber layer 2 of the semi-finished product prepared in the previous step, attaching carbon fibers and winding the carbon fibers on the periphery of the semi-finished product, and thus constructing 1 carbon fiber layer 2 on the periphery of the semi-finished product to serve as a skin layer of a pipe wall;

s4, ultraviolet irradiation is carried out to enable the resin adhered with each layered structure to be crosslinked and cured, so that the tube wall is shaped, and in some embodiments, the resin can be crosslinked and cured in a heating mode;

and S5, removing the tube core mould to obtain a tubular structure formed by compounding the PMI film and the carbon fibers.

In the tubular structure prepared by the above process, the angle formed by the lines of the adjacent two layers of layered structures is 45 degrees, and the thickness of the PMI film adopted is not more than 1 mm.

The bicycle that this embodiment provided includes: the bicycle comprises a front frame 3, a front fork 4, a rear fork, a five-way joint, a handle 7, a seat tube, a cushion, a tire, a hub and a pedal, wherein the front frame 3 comprises a head tube 31, an upper tube 32, a lower tube 33 and a vertical tube 34, the rear fork comprises an upper rear fork 5 and a lower rear fork 6, and the hub comprises a wheel frame and spokes 8. Of the above components, the head tube 31, the upper tube 32, the lower tube 33, the stem 34, the front fork 4, the rear upper fork 5, the rear lower fork 6 and the spokes 8 are all tubular structures prepared by the above method provided in this embodiment.

The handle 7 includes a pair of arc-shaped grip portions 71 and T-shaped connecting rods 72, and the grip portions 71 are manufactured by using a bent rod-shaped mold with a certain arc as a tube core mold according to the manufacturing method of the tubular structure, and the connecting rods 72 are manufactured by using a combined mold vertically assembled by two straight rod-shaped molds as a tube core mold according to the manufacturing method of the tubular structure. Two ends of the connecting rod 72 are respectively connected with a handle part 71, the handle parts 71 are communicated with the connecting rod 72, as shown in fig. 2, and the layered structure of the tube wall of the handle 7 is shown in fig. 1.

In the present embodiment, the front frame 3 and the front fork 4 are integrally formed, so that the production of the coupled front frame 3 and the front fork 4 is performed in the same molding operation during the production process. The front fork 4 and the upper tube 32 are both arc-shaped tubular structures with certain radians, and the bending rod-shaped molds for molding the front fork 4 and the upper tube 32 are respectively selected according to the parameter requirements of the front fork 4 and the upper tube 32 such as length, bending degree, inner diameter and the like. The head pipe 31 and the stand pipe 34 are both vertical tubular structures with circular cross sections, and cylindrical molds for molding the head pipe 31 and the stand pipe 34 are respectively selected according to the parameter requirements of the length, the inner diameter and the like of the head pipe 31 and the stand pipe 34. The lower pipe 33 is a vertical tubular structure with a cross section in a fillet quadrangle, and a straight rod mold with a cross section in a fillet quadrangle is selected for molding the lower pipe 33. The combined mold assembled by the required molds is used as a tube core mold, the front frame 3 and the front fork 4 which are integrally formed are manufactured according to the manufacturing method of the tubular structure, and mold openings are reserved at the lower end of the front fork 4, the upper end of the head tube 31, the front end of the upper tube 32, the rear end of the lower tube 33 and the upper end of the vertical tube 34 so as to be convenient for demolding. As shown in FIG. 3, the two ends of the upper tube 32 and the lower tube 33 are respectively connected with the head tube 31 and the stand tube 34, the upper tube 32, the head tube 31, the lower tube 33 and the stand tube 34 are sequentially communicated, the lower end of the head tube 31 is communicated with the front fork 4, and the above components jointly form a communicated pipe network structure.

The rear upper fork 5, the rear lower fork 6 and the spokes 8 of the embodiment are simple single-tube structures, and the required tube core mold is simple. The rear upper fork 5 is an arc-shaped tubular structure with radian, a bent rod-shaped mould with radian is used as a tube core mould of the rear upper fork 5, and the rear upper fork 5 is manufactured according to the manufacturing method of the tubular structure. The rear bottom fork 6 is of a conical cylinder structure with a round-cornered quadrilateral cross section and gradually reduced outer diameter along the length direction, a conical rod-shaped mold with a round-cornered quadrilateral cross section is used as a tube core mold of the rear bottom fork 6, and the rear bottom fork 6 is manufactured according to the manufacturing method of the tubular structure. The spoke 8 is in a vertical tubular structure, a straight rod-shaped mold is used as a tube core mold, and the spoke 8 is manufactured according to the manufacturing method of the tubular structure.

The parts included in the bicycle of the present embodiment are assembled according to a general assembling method of the bicycle, the connecting rod 72 of the handle 7 is inserted into the upper end of the head pipe 31 of the front frame 3, the handle 7 is communicated with the front frame 3, the rear upper fork 5 is fixedly connected with the vertical pipe 34 by using a strong glue or a bolt, the vertical pipe 34 and the rear lower fork 6 are assembled through a five-way joint, and the assembly is completed as shown in fig. 4.

And a plurality of wiring holes for wiring and passing through the vehicle body can be formed on the surface of the vehicle body, so that wiring inside the vehicle body is realized by utilizing the inner cavity of the tubular structure. Specifically, a pair of wire holes are formed in the front side of each of the two ends of the handle 7 above the position where the brake caliper is mounted, a pair of wire holes are formed in the surface of the head pipe 31, the wire holes in the head pipe 31 are symmetrically distributed about the plane of the front wheel of the bicycle, and finally, a wire hole is formed in each of the front and rear ends of the upper and lower tubes 32, 33.

In practical applications, the number of layers and the thickness of the layered structure constituting the different parts having the above-described tubular structure may be adjusted, respectively, within appropriate ranges, as required.

Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will understand that the present invention can be modified or replaced with other embodiments without departing from the spirit and scope of the present invention.

Claims (10)

1. A bicycle, characterized in that: the composite pipe is provided with a hollow tubular structure, the pipe wall of the tubular structure is composed of a plurality of layers of laminated structures, each laminated structure comprises at least three carbon fiber layers and at least two layers of PMI films, the carbon fiber layers are respectively arranged on the inner side and the outer side of each layer of PMI film, and the substrate layer and the skin layer of the pipe wall are both the carbon fiber layers;

the bicycle comprises a frame comprising the tubular structure.

2. The bicycle of claim 1, wherein: the PMI film was made of 100% PMI.

3. The bicycle of claim 2, wherein: the thickness of the PMI film is not more than 1 mm.

4. The bicycle of claim 3, wherein: the PMI film is directly coated on the periphery of the carbon fiber layer at the inner side of the PMI film.

5. The bicycle of claim 3, wherein: the PMI film is spirally wound around the outer periphery of the carbon fiber layer on the inner side thereof.

6. The bicycle of any of claims 1-5, wherein:

the frame comprises a front frame, a front fork and a rear fork;

the front frame, the front fork and the rear fork are all formed by tubular structures;

the front frame is communicated with the front fork and the rear fork.

7. The bicycle of claim 6, wherein: the front frame and the front fork are integrally formed.

8. The bicycle of claim 6, wherein:

the wire-guiding structure also comprises a plurality of wire-guiding holes, wherein the wire-guiding holes are used for allowing wires to pass through;

the frame comprises a head pipe, an upper pipe, a lower pipe and a vertical pipe, wherein the two ends of the upper pipe and the lower pipe are respectively provided with the wiring holes.

9. The bicycle of claim 8, wherein:

the handle is formed by the tubular structure and communicated with the head pipe;

the two ends of the handle are respectively provided with the wiring holes;

the head tube is provided with a group of the wire holes, and the wire holes are symmetrically distributed on the surface of the head tube relative to the plane of the front wheel of the bicycle.

10. The bicycle of claim 6, wherein: also included are spokes comprised of the tubular structure.

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