JPH0471978A - Resin frame construction for bicycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a resin frame structure for two-wheeled vehicles, and more specifically, a structure for two-wheeled vehicles in which a rear wheel support member for supporting a rear wheel is attached to a hollow frame made of a resin material. Regarding resin frame structure.

[Prior Art] Resin frames for two-wheeled vehicles such as bicycles, for example, are
As shown in No. 502577, a pipe section connecting the seat support section and the rear wheel support section and a pipe section connecting the pedal support section and the rear wheel support section are each made of a resin material, and the rear wheel There is a system in which the legs of a rear wheel support member are fixed to the support part, and the rear wheel is supported on the support part of the rear wheel support member.

[Problems to be Solved by the Invention] This rear wheel support member supports the rear wheel axle and is a part where loads are concentrated, so it is formed of a particularly rigid member and attached to the resin frame. In order to reduce the size and weight, the legs of the rear wheel support member are made thinner. By the way, if the leg portion of the rear wheel support member that supports the rear wheel is made thin, the resin frame itself will also become thinner, making it difficult to ensure sufficient strength and rigidity.

Further, for example, in order to integrate the resin frame and the rear wheel support member, molding is performed by applying pressure inside the hollow part with the rear wheel support member set in the hollow part of the frame material provided in the mold. However, in this case, there is a risk that the pressure at the connection portion between the resin frame and the rear wheel support member is insufficient, and the strength of this portion may be insufficient. In order to compensate for these deficiencies in strength and rigidity, it is necessary to increase the thickness and diameter of the resin frame, but in this case, there is a problem that the weight increases.

This invention was made in view of the above circumstances, and aims to provide a resin frame structure for a motorcycle that can easily ensure high strength and high rigidity and also achieve a reduction in size and weight. .

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a pipe section that connects a seat support section and a rear wheel support section, and a pipe section that connects a pedal support section and a rear wheel support section. and a resin frame for a two-wheeled vehicle, each of which is made of a resin material, a leg portion of a rear wheel support member is fixed to the rear wheel support portion, and a rear wheel is supported on the support portion of the rear wheel support member. The parts are integrally connected to each other so that the hollow parts of the respective pipe parts communicate with each other, and the hollow part of the rear wheel support part is divided into two hollow parts by a partition wall substantially parallel to the longitudinal direction of the pipe part, The present invention is characterized in that the legs of the rear wheel support member are accommodated and clamped in one of these two hollow portions, thereby fixing the rear wheel support member.

[Function] In this invention, even if the leg portion of the rear wheel support member is made thin, a hollow portion is formed in the rear wheel support portion of the resin frame, and this hollow portion is formed by a partition wall approximately parallel to the longitudinal direction of the pipe portion. This partition wall improves the strength and rigidity of the rear wheel support part of the resin frame. Furthermore, since the legs of the rear wheel support member are accommodated and held in one of the two hollows separated by the partition, the rear wheel support can be made thicker even if the legs are thin. , weight reduction, high strength, and high rigidity can be achieved at the same time.

In addition, when pressurizing and molding the inside of the hollow part of the resin frame, the rear wheel support part is also sufficiently pressurized by integrally connecting each hollow part inside the pipe member so that the hollow parts inside the pipe member communicate with each other. Sufficient strength of the support portion is ensured, and the leg portions of the rear wheel support member are also reliably supported.

[Example] Next, an example of the present invention will be described in detail with reference to the accompanying drawings.

Figure m1 is a side view of a motorcycle to which this invention is applied, Figure 2 is a side view of a frame mold, Figure 3 is a rear view of the frame mold, Figure 4 is a bottom view of the frame mold, and Figure 4 is a bottom view of the frame mold. Figure 5 shows a state in which a hollow frame material is housed in the frame mold, Figure 6 shows a state in which a bag material is housed in the hollow part of the frame material, and Figure 7 shows a state in which the internal pressure inside the bag material is 8 is a sectional view showing a state in which the bag material is inflated and the frame material is compressed between the bag material of the mold, and FIG. 9 is a cross-sectional view showing the state before adding The sectional view, FIG. 10, is a sectional view taken along line XX in FIG.

Reference numeral 1 in the figure indicates a bicycle, which is a two-wheeled vehicle, and the frame 2 of this bicycle has a steering support portion 2a, a rear wheel support portion 2b, a seat support portion 2C, and a pedal support portion 2d, which are respectively connected to pipe portions 28 to 21. connected. A front fork 3 is rotatably supported by the steering support portion 2a, a handle 4 is provided above the front fork 3, and an axle 6 of a front wheel 5 is supported below. A leg portion 7a of a support member 7 is provided on the rear wheel support portion 2b, and a rear wheel 80 and an axle 9 are supported on the support portion 7b of the support member 7. A support pipe 11 for the seat 10 is provided in the seat support portion 2C. A pedal 12 is rotatably provided on the pedal support portion 2d, and when the pedal +2 rotates, the pedal sprocket 13 rotates as a unit, and this power is transmitted to the rear wheel sprocket 15 via the chain 14. 8 is driven.

The front half of the frame 2 is formed into a substantially triangular shape by a steering support portion 2a, a seat support portion 2C, a pedal support portion 2d, and pipe portions 2e, 2f, and 2i that connect these parts, and a front space 16 is provided inside thereof. It is being

From the pipe part 2e of this frame 2, the pipe parts 2f, 2i
The cross-sectional area is increased to increase the strength of the parts where large loads are applied. In addition, since the rear half of the frame 2 supports the axle 9 of the rear wheel 8 from both left and right sides of the rear wheel 8 with a rear wheel support section 2b, a pipe section extends from the seat support section 2C and the pedal support section 2d to the rear wheel support section 2b. 2g and 2h are connected to form two prongs, forming a triangular shape on the right side and a triangular shape on the left side, and rear spaces 17 and 18 are also provided inside each of them.

In order to mold this frame 2, molds as shown in FIGS. 2 to 5 are used, including a right mold 19 and a left mold 20.
and a rear center mold 21. This right side type 1
9. Recesses 19a and 20a that follow the shape of the frame 2 are formed on the inside of the left mold 20, and a recess 21a that follows the shape of the frame 2 is formed on the outside of the rear center mold 21.

Recessed portion 19 of right side mold 19, left side mold 20, and rear center mold 21
A frame material 22 made of thermosetting resin is accommodated in a, 20a, and 21a. This frame material 22 is made of a thin sheet material made of a TA fiber material impregnated with a thermosetting resin such as an epoxy resin, a cloth material such as carbon fiber, aramid fiber, or glass fiber, or a sheet material of unidirectional fiber. Use 3 to 8 layers. In this case, it is best to stack the fibers in different directions to form a thick tube.
For example, two unidirectional fiber sheets with a thickness of 0.15 mm or 0.2 mm are placed at θ° with respect to the longitudinal direction of the frame.
, 45°, -45', Oo, or θ'
'', 45°, and -45' to form a frame material 22 with a plate thickness of 1.2 mm, for example.As shown in FIGS. 7 and 8, this frame material 22 has its ends 22
The a's overlap each other, making it hollow.

Inside the hollow frame member 22 made of thermosetting resin, flexible and elongated bag members 230, 231, and 232 as shown in FIGS. 4 and 6 are accommodated. The bag material 230, 231, 232 is formed in advance into a concave shape similar to the cross-sectional shape of the frame, and is made of a flexible and heat-resistant thermoplastic resin film, such as polyamide or polyethylene terephthalate. ing.

The bag material 230 is the frame material 22 of the right side mold 19 and the left side mold 20.
The steering support part 2a, the seat support part 2C, and the pedal support part 2d of the front half of the frame 2 are arranged in the hollow space to form a substantially triangular shape with the pipe parts 2e, 2f, and 2i connecting these parts. , In this state, the right type 19
The peripheral portions of the left mold 20 and the left mold 20 are tightened and fixed with bolts 31 and nuts 32.

The bag materials 231 and 232 are pipes that extend from the seat support section 2C and pedal support section 2d in the rear half of the frame 2 to the rear wheel support section 2b in the hollows of the frame materials 22 of the right side mold 19, left side mold 20, and rear center mold 21. It is arranged to form a two-pronged right triangular shape and a left triangular shape connected by the parts 2g and 2h, and in this state, the peripheral parts of the right side mold 19, left side mold 20, and rear center mold 21 are tightened with bolts 31 and nuts. Tighten and fix with 32. The rear wheel support portion 2b of each right side mold 19
In the part forming the rear wheel support part 2b of the left side mold 20, a bag material 231 is attached to the frame material 22 provided on the right side mold 19, and a bag material 232 is attached to the frame material 22 provided on the left side mold 20. Apply the frame material 220 to the bag materials 231 and 232, and then attach the leg portions 7 of the rear wheel support member 7.
a is applied to the frame material 220, and the rear center mold 21 provided with the frame material 22 is joined to the right mold 19 and the left mold 20.

The rear wheel support member 7 may be made of aluminum, carbon resin, or the like, and the rear wheel support member 7 may have a structure in which the entire rear wheel support member 7 is covered with a frame material.

In the steering support molding parts of the right side mold 19 and the left side mold 20, the support bracket 33 is located on the bottom 230a side of the bag material 230.
The air supply section 2 of the zero bag material 230 is fixed with a bolt 34.
On the 30b side, the support bracket 35 is tightened and fixed to the left side mold 19 and the left side mold 20 with a retaining bolt 37 via a seal member 36 with the air supply section 230b open. This support bracket 35 is provided with an air injector 38, and air is supplied into the bag material 230 through this air injector 38.

Further, in the seat support molding portions of the right mold 19 and the left mold 20, support brackets 33 are fixed with bolts 34 on the bottom portions 231a, 232a sides of the bag materials 231, 232. The air supply parts 231b and 232b sides of the bag materials 231 and 232 are attached to the pedal support molding parts of the right mold 19 and the left mold 20 through the seal member 36 with the air supply parts 231b and 232b open. Handle bolt 37
Tighten and secure. This support bracket 35 is provided with an air injector 38, and air is supplied into the bag materials 231, 232 through this air injector 38.

When air is supplied to the bag materials 230, 231, 232, the entire bag materials 230, 231, 232 expand, and this expansion causes the frame material 22 to be connected to the right mold 19, the left mold 20, the rear center mold 21, and the bag material 230. .231, 232 and is heated and cured in a compressed state.

At this time, the right side type 19, the left side type 20, and the rear center type 21
In the rear wheel support molding section, the expansion of the bag materials 231 and 232 presses the frame material 22 against the right mold 19 and the left mold 20, respectively, and also presses the frame material 220 against the leg portion 7a of the rear wheel support member 7. The frame material 22 is pressed against the rear center mold 21 via the leg portions 7a of the rear wheel support member 7, whereby the frame materials 22, 220 are heated and hardened in a compressed state.

In this way, the rear wheel support part 2b of the frame 2 is integrally connected to each other so that the hollow parts of the pipe parts 2g and 2h communicate with each other. Two hollow parts 2ft in the partition wall 2 substantially parallel to the direction,
The leg part 7 of the rear wheel support member 7 is divided into two hollow parts 2m and 2m.
The rear wheel support member 7 is fixed by holding and holding the rear wheel support member 7a. It is sufficient to fix the rear wheel support member 7 by storing and sandwiching the leg part 7a of the rear wheel support member 7 in one of these two hollow parts 2ft and 2m, and in the outer hollow part 2j2. The leg part 7a of the rear wheel support member 7 may be accommodated and clamped to fix the rear wheel support member f.

Therefore, even if the leg portions 7a of the rear wheel support member 7 are made thin, a hollow portion is formed in the rear wheel support portion 2b of the resin frame 2.
This hollow part is divided into two hollow parts 211.2m by a partition wall 2 that is substantially parallel to the longitudinal direction of the pipe part, and by forming this partition wall 2k, the strength and rigidity of the rear wheel support part 2b are improved. ing. In addition, these two hollow parts are 2℃, 2m
Since the leg portion b of the rear wheel support member 7 is accommodated and held in the hollow portion of one of the two, the rear wheel support portion 2b can be made thicker even if the leg portion 7b is thin, resulting in light weight and high strength. ,
High rigidity can be achieved at the same time.

In addition, when pressurizing and molding the inside of the hollow part of the resin frame 2 as in this embodiment, the rear wheel support part 2b is also sufficiently pressurized by integrally connecting each other so as to communicate through the hollow part. As a result, the rear wheel support member 7 can be firmly fixed to the rear wheel support section 2b, and the strength of the rear wheel support section 2b itself can also be ensured sufficiently.

In the thus formed frame 2, the steering support part 2a, seat support part 2c, and pedal support part 2d are each made of aluminum material, carbon resin material, etc., as shown in FIG. The pipe materials 42 to 44 are inserted into predetermined locations and fixed and reinforced using an adhesive.

Furthermore, this reinforcement can be achieved by molding the frame material 22 itself to be slightly thicker and later molding each part by cutting, thereby completing the molding of the resin frame 2 for a two-wheeled vehicle.

[Effects of the Invention] As described above, in this invention, the rear wheel support portions of the frame are integrally connected to each other so that the hollow portions of the pipe portions communicate with each other, and the hollow portions of the rear wheel support portions are connected to the pipe portions. Since the two hollow portions are partitioned by partition walls that are substantially parallel to the longitudinal direction of the resin frame, the strength and rigidity of the rear wheel support portion of the resin frame are improved by the partition walls. Furthermore, since the leg portion of the rear wheel support member is accommodated and held in one of the two hollow portions partitioned by the partition wall, the leg portion of the rear wheel support member can be firmly supported. .

In addition, when pressurizing and molding the inside of the hollow part of the resin frame, the rear wheel support part is also sufficiently pressurized by integrally connecting each hollow part inside the pipe member so that it communicates with the rear wheel support part. The support member can be firmly fixed to the rear wheel support part, and the strength of the rear wheel support part itself is also ensured sufficiently.

[Brief explanation of drawings]

Fig. 1 is a side view of a motorcycle to which the present invention is applied, Fig. 2 is a side view of a frame mold, Fig. 3 is a rear view of the frame mold, and Fig. 4 is a bottom view of the frame mold. Fig. 5 shows a hollow frame material housed in the frame mold, Fig. 6 shows a bag material housed inside the frame material, and Fig. 7 shows a bag material inside the bag material. 8 is a sectional view showing the state before applying internal pressure, FIG. 8 is a sectional view showing the state where the bag material is expanded and the frame material is compressed between the bag material of the mold, and FIG. 9 is the IX- in FIG. 1. IX sectional view, and FIG. 10 is a XX sectional view of FIG. In the drawing, the reference numeral indicates a wheeled vehicle, 2 is a frame, 2a is a steering support part, 2b is a rear wheel support part, 2C is a seat support part, 2
d is a pedal support part, 2 is a partition wall, 2It, 2m is a hollow part, 7 is a rear wheel support member, 7B is a leg part, 7b is a support part, 19
is right side type, 20 is left side type, 21 is rear center type, 22,2
20 is a frame material, and 230, 231, and 232 are bag materials. Figure Figure Figure Figure h Figure 10

Claims (1)

[Claims] A pipe portion connecting the seat support portion and the rear wheel support portion and a pipe portion connecting the pedal support portion and the rear wheel support portion are each made of a resin material, and the rear wheel support member is attached to the rear wheel support portion. In a resin frame for a two-wheeled vehicle in which a leg is fixed and a rear wheel is supported on a support part of the rear wheel support member, the rear wheel support part is integrally connected to each other so that each hollow part of each of the pipe parts communicates with each other. The hollow part of this rear wheel support part is divided into two hollow parts by partition walls substantially parallel to the longitudinal direction of the pipe part, and the rear wheel support member is placed in one of these two hollow parts. A resin frame structure for a two-wheeled vehicle that accommodates and clamps the legs of a motorcycle to secure a rear wheel support member.