CN1171348A - Frame structure for moped - Google Patents

Abstract

The present invention provided a motorcycle frame structure. In a motorcycle in which a car body frame is constituted by suspending an internal combustion engine in the lower part of one main pipe 4 and connecting a pair of left and right sub-pipes 6 and 8 to the rear part of the main pipe 4, thereby the car body frame 2 is constructedthe; sub-pipes 6 and 8 are formed to be square pipes in section, plates 5 and 7 having flat surfaces are welded to the rear side face of the main pipe 4, the front parts of the sub-pipes 6 and 8 are welded to the flat surfaces of the plates 5 and 7 and thereby the car body frame 2 is constructed. Thereby it's capable of constituting a highly accurate car body frame at low costs without needing any high dimension accuracy for a main pipe and a sub-pipe or any special machining step.

Description

Frame structure of two-wheeled motor vehicle

The invention relates to a frame structure of a two-wheeled motor vehicle.

There are many kinds of frame structures of motorcycles. In this type of frame in which a main pipe extends from the head pipe to the rear, the auxiliary pipes such as the cross struts of the seat are connected to the main pipe with their front parts. Rear and extend rearward.

When joining the sub-pipe to the main pipe, conventionally, the sub-pipe is pressed against the main pipe and welded.

In the case where the main tube is a square tube and the subframe is a cylindrical tube (Republic of China No. 60-39350), the joining method used is to extrude the front end of the cylindrical subframe to form a flat surface. The flat side is against the side of the main tube and welded.

When adopting the former method of pushing the auxiliary pipe on the main pipe, in order to maintain the installation accuracy, the dimensional accuracy of the main pipe and the auxiliary pipe must be improved, thereby increasing the cost.

In addition, the latter method of placing the processed front end of the sub-frame close to the side of the main pipe can be adjusted during assembly. The main pipe and the auxiliary pipe do not require high dimensional accuracy, but it is necessary to squeeze the front end of the auxiliary pipe. The manufacturing process of press processing, so this also increases the cost.

The present invention is made in view of the above problems, and its purpose is to provide a frame structure of a two-wheeled motor vehicle. The frame structure of this two-wheeled motor vehicle does not require high dimensional accuracy of the main pipe and the auxiliary pipe, and does not require With special processing steps, a frame with good precision can be formed at low cost.

In order to achieve the above object, the frame structure of the motorcycle of the present invention, the motorcycle hangs an internal combustion engine at the lower part of a main pipe, and connects a pair of left and right secondary pipes at the rear of the main pipe, thereby forming a vehicle frame; Wherein, the above-mentioned secondary pipe is a square-section pipe, a plate with a flat surface is welded on the rear side of the above-mentioned main pipe, and the front part of the above-mentioned secondary pipe is welded on the flat surface of the plate, thereby forming a vehicle frame.

Since the front part of the square sub pipe is welded on the flat surface of the plate welded to the side of the rear part of the main pipe, the error at the time of joining can be absorbed, and high dimensional accuracy is not required for the main pipe or the sub pipe, and processing of the pipe is not required. The manufacturing process can be simplified and the cost can be reduced.

In the frame structure of the motorcycle according to claim 1, the plate is used as a suspension plate for supporting the internal combustion engine, since no special preparation of the plate is required for joining the main pipe and the auxiliary pipe, so that the structure can be simplified and the cost can be reduced.

In the frame structure of a motorcycle according to claim 1 or 2, since the main pipe is a cylindrical pipe, it can also be applied to a cylindrical main pipe.

In the frame structure of a motorcycle according to claim 1, a mounting support plate having an integral upper and lower connecting portion is protrudingly provided on the head pipe formed at the front end of the main pipe, and the mounting support plate is sequentially overlapped. The front cover and the front basket are connected together by the above-mentioned upper and lower connection parts, so that the front basket can be simply used as an optional part, and the installation of the front basket will not have a great impact on the accuracy of the frame, and the number of parts can be reduced .

In the frame structure of the motorcycle according to claim 1, a tool box integrated with the battery box is provided below the fuel tank supported by the auxiliary pipe, so that tools can be stored together with small items. In the tool box with separate boxes, the capacity of the storage box for small items is secured, and the number of parts can be reduced while concentrating heavy items such as batteries and tools and lowering the center of gravity.

In the frame structure of the motorcycle according to claim 5, by disposing a screwdriver for attaching and dismounting the cover plate under the vehicle seat which is separate from the tools accommodated in the tool box, it is possible to ensure the storage of small items. The capacity of the box, and the cover of the tool box can be assembled and disassembled with a screwdriver configured under the vehicle seat for disassembling the cover, without affecting the maintainability.

Fig. 1 is an overall side view of a motorcycle according to an embodiment of the present invention.

Fig. 2 is a side view of the frame of the motorcycle in Fig. 1 .

Fig. 3 is a top view of the vehicle frame in Fig. 2 .

Fig. 4 is a rear view of the vehicle frame in Fig. 2 .

FIG. 5 is an exploded perspective view of the frame of FIG. 2 .

FIG. 6 is an exploded side view showing the assembly process of the frame of FIG. 2 .

Fig. 7 is a plan view of the front side engine suspension plate (VII arrow view in Fig. 6).

Fig. 8 is a front view of the front engine suspension plate (view from the arrow VIII in Fig. 6).

Fig. 9 is a top view (view from IX direction in Fig. 6 ) of the rear engine suspension plate.

Fig. 10 is a rear view of the rear engine suspension plate (viewed along X in Fig. 6).

Fig. 11 is a side view of main parts with partial sections omitted, showing the mounting structure of the front basket.

Figure 12 is a front view of the front top cover.

Fig. 13 is a side view, partly in section, of the front roof panel.

Fig. 14 is a right side view of the box member.

Fig. 15 is a plan view of a box member.

Fig. 16 is a right side view of the cover member.

Fig. 17 is a plan view of the cover member.

Fig. 18 is a side view showing a modification of the front basket mounting structure, with partial sections omitted.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 17 .

FIG. 1 is an overall side view of a motorcycle according to an embodiment of the present invention, and FIG. 2 is a side view of a frame 2 of the motorcycle 1 .

The frame 2 is a cylindrical main pipe 4 extending obliquely backward from the head pipe 3 at the front of the vehicle body, and a pair of left and right front engine suspension plates 5 are welded slightly backward on the way of the main pipe 4 , 5, the front ends of the left and right vehicle seat cross struts 6, 6 are welded respectively through the left and right pair of front side engine suspension plates 5, 5 and extend obliquely towards the rear.

A pair of left and right rear engine suspension plates 7, 7 are welded at the rear end of the main pipe 4, between the rear engine suspension plates 7, 7 and the rear ends of the above-mentioned vehicle seat cross struts 6, 6, which are slightly forward. , rear stays 8,8 are installed respectively.

The vehicle seat cross strut 6 and the rear stay 8 are tubes with a square section.

The head pipe 3 and the main pipe 4 are reinforced and joined together by the gusset plate 9, and the first horizontal plate 10, the second horizontal bar 11 and the third horizontal plate 12 are erected in sequence between the left and right saddle bars 6, 6 , forming a whole.

The internal combustion engine 15 is suspended on the front side engine suspension plate 5 and the rear side engine suspension plate 7 of the main pipe 4 bottom in such vehicle frame 2, and the pivot on the head pipe 3 at the front portion of the vehicle frame 2 supports the steering shaft. A handlebar 17 is provided on the upper portion of the steering shaft to extend left and right, and a front fork 18 is connected to and extends downward at the lower portion, and a front wheel 19 is pivotally supported at the lower end of the front fork 18 .

The rear engine suspension plate 7 suspends and supports the internal combustion engine 15 , and supports the front end of the rear fork 20 via the pivot 21 . The rear wheel 22 is pivotally supported on the rear end portion of the rear fork 20 extending rearward, and is freely swingable. Between the rear end of the rear fork 20 and the above-mentioned saddle bar 6 , rear shock absorbers 23 are mounted on the left and right, respectively.

The internal combustion engine 15 is suspended from the front and rear engine suspension plates 5, 7 via the support pins 16a, 16b, and the crankcase 15a is installed, and the cylinder 15b protrudes from the crankcase 15a forwardly and nearly horizontally.

A carburetor 26 is disposed above the cylinder 15 b through an intake pipe 25 , and an air cleaner 27 is supported on the main pipe 4 above the carburetor 26 .

The exhaust pipe 28 extends from the lower portion of the cylinder 15b, extends rearward along the lower surface of the crankcase 15a, and is connected to the muffler 29 on the right side of the rear wheel while being deflected to the right.

The fuel tank 30 is supported by the first template 10 at the front half of the vehicle seat cross strut 6, and a small item storage box 31 is arranged behind it, and the vehicle seat 32 is covered above the fuel tank 30 and the small item storage box 31. The front end of the seat 32 is fixed by a pivot, so that the seat 32 can swing freely to open and close.

A box that integrates a battery box 34 and a tool box 35 is fitted and supported in a space below the fuel tank 30 that is formed by the main pipe 4, the seat rail 6, and the rear stay 8 and that is triangular when viewed from the side. The member 33 accommodates a battery 36 and a tool 37 .

This motorcycle 1 covers the front of the head pipe 3 by the front top cover plate 40, and the main pipe cover 41 covers the upper side of the main pipe 4 from the rear side of the head pipe 3 to the rear. A pair of left and right front side cover plates 42, 42 and a pair of left and right leg shields 43, 43 are provided between the cover plates 41, and the left and right pair of front side cover plates 42, 42 cover the cylinder 15b of the internal combustion engine 15 from left to right. The upper part and the intake system of carburetor 26, air cleaner 27 etc., this left and right pair of leg shields 43,43 spread out to the left and right, cover the cyclist's foot front.

The left and right sides of the tank member 33 are covered by side covers 44, 44 respectively, and a rear cover 45 is provided below the seat 32, and the rear cover 45 covers the surroundings of the fuel tank 30 and the small item storage box 31. .

The top of the front wheel 19 is covered by the front fender 46, and the rear fender 47 covers the top of the rear wheel 22 so as to extend rearward from above the rear wheel.

A front basket 48 is attached to the front of the front roof panel 40 .

Next, the joining structure of the frame 2 of the motorcycle 1 generally constructed as above will be described.

The front side engine suspension plate 5 welded to the main pipe 4 is composed of a fitting curved portion 5a and a hanging portion 5b as shown in FIGS. 5b extends downward from the fitting bent portion 5a so as to deviate outward, and has an attachment hole 5c for suspending the attachment portion of the internal combustion engine 15 through the support box 16a at the lower portion of the suspension portion 5b.

A vertical flat surface 5d slightly concaved outward is formed at the center of the fitting curved portion 5a.

The front engine suspension plate 5 is fitted and welded to the cylindrical main pipe 4 from the side by its matching curved portion 5a, and a flat surface 5d is vertically provided on the outside of the fitting curved portion 5a. The suspension part 5b is provided vertically (refer FIG. 8).

The front side engine suspension plate 5 is symmetrically arranged on the left and right sides of the main pipe 4 .

As shown in Fig. 5, Fig. 6, Fig. 9 and Fig. 10, the rear side engine suspension plate 7 has a fitting curved portion 7a fitted into the cylindrical main pipe 4, and is deflected outward through its lower end horizontal section portion 7b. The hanging part 7c hangs downward from the position.

A vertical flat surface 7d is formed on the upper part of the suspension part 7c, and a mounting hole 7e for supporting the rear mounting part of the internal combustion engine 15 through a support pin 16b is formed near the center of the front end edge of the suspension part 7c. A shaft hole 7f passes through and supports the pivot 21 for supporting the rear fork 20, and a pivot hole 7g for pivoting the main leg 39 is pierced vertically below the pivot hole 7f. (Refer to Figure 6).

The rear engine suspension plate 7 is fitted and welded to the rear portion of the cylindrical main pipe 4 from the side by its fitting bending portion 7a, and a flat surface 7d is vertically extended downward from a position deflected to the outside, and the mounting hole 7e, the pivot The shaft hole 7f and the pivot hole 7g are located on the vertically lower hanging portion 7c.

The rear engine suspension plate 7 is symmetrically arranged on the left and right of the rear portion of the main pipe 4 .

In this way, the front and rear engine suspension plates 5, 7 are welded on the main pipe 4, and on the front half of the vehicle frame 2, a mounting piece 51 is protruding forward on the front of the lower part of the head pipe 3, and on the gusset plate 9 on the right and left sides respectively Housing brackets 52, 52 are protruded, and housing brackets 53, 53 are also protruded from the left and right sides of the front engine suspension plates 5, 5.

The rear half of the vehicle frame 2 is welded to the left and right respectively with the seat cross struts 6 and the rear stays 8, between the right and the right seat cross struts 6, 6 are sequentially connected with the first cross plate 10 and the second cross bar 11 , the 3rd horizontal board 12.

The second cross bar 11 is erected between the triangular left and right pillars 11a, 11a, and each pillar 11a, 11a is welded to the left and right seat cross pillars 6, 6. 11b, the support shafts 11b, 11b respectively support the upper ends of the above-mentioned rear buffers 23, 23 in the form of pivots.

After assembling the front half and the rear half of the vehicle frame 2 as above, the main pipe 4 of the front half, the seat cross strut 6 and the rear stay 8 of the rear half are joined by the front and rear engine suspension plates 5,7.

That is, from the outside, the front end of the seat cross strut 6 is abutted against the outer flat surface 5d of the front engine suspension plate 5 fixed to the main pipe 4 (refer to Fig. 2, Fig. 7, Fig. 8 ), The front end of the rear stay 8 is brought into close contact with the outer flat surface 7d of the rear engine suspension plate 7 fixed to the rear of the main pipe 4 (see FIGS. 2 , 9 , and 10 ).

At this time, the installation position can be adjusted, and the dimensional error of the front and rear components can be absorbed.

In this way, the front half and the rear half of the vehicle frame 2 form a proper mutual positional relationship, weld the front side engine suspension plate 5 and the front end of the vehicle seat cross strut 6, and weld the rear engine suspension plate 7 and the rear stay. The front end portion of 8 is joined into one body.

When the vehicle frame is joined as mentioned above, since the dimensional error can be absorbed, the main pipe 4, the saddle bar 6, and the rear stay 8 do not need to have high dimensional accuracy, the manufacture is easy, and there is no need to adjust the saddle bar 6 and the rear stay 8. The rear stay 8 is specially processed, so the manufacturing process can be simplified and the cost can be reduced.

Because the front and rear engine suspension plates 5 and 7 between the main pipe 4 of the front half and the vehicle seat cross strut 6 and the rear stay 8 of the rear half are used as the plates for suspending the internal combustion engine 15, and the rear engine suspension plate 7 Also used as a pivot bearing for supporting the rear fork 20, the number of parts is reduced, the structure is simplified, and the cost can be further reduced.

A mounting piece 51 protrudes from the front end head pipe 3 of the vehicle frame 2 thus assembled, and a support plate 55 is fixedly mounted on the mounting piece 51 .

As shown in Figure 11, the mounting support plate 55 has a body plate 55a and a connecting piece 55b. Fastened with bolts at 2 front and rear.

The main body plate 55a for attaching the support plate 55 has a connection screw hole 55c formed in the center of the upper part, and connection screw holes 55d and 55d are respectively formed in the lower part on the left and right.

The above-mentioned front top cover plate 40 is superimposed on the front surface of the main body plate 55 a of this attachment support plate 55 , and the above-mentioned front basket 48 is attached through a sleeve 56 .

As shown in Figures 12 and 13, the front top cover plate 40 is a slightly curved left-right symmetrical plate-shaped member that can cover the front of the head pipe 3, and the left and right side edges 40d, 40d are slightly thinner downwards, and can A mounting hole 40a is pierced in the center, and mounting holes 40b, 40b are respectively pierced in some recessed positions below it, and the 3 mounting holes 40a, 40b, 40b are connected to the 3 mounting supports 55 above. Correspond to the threaded holes 55c, 55d, 55d.

In the front basket 48 , mounting fittings 49 are fixed to the rear wall 48 a corresponding to the three connection threaded holes 55 c , 55 d , and 55 d of the above-mentioned mounting support plate 55 .

When installing the front basket 48, first align the threaded holes 55c, 55d, 55d with the mounting holes 40a, 40b, 40b in front of the body plate 55a of the mounting support plate 55, overlap the front top cover plate 40, and then put the cylinder The sleeves 56 are fitted into the recesses of the mounting holes 40a, 40b, 40b, the mounting fittings 49 of the rear wall 48a of the front basket 48 are superimposed on each sleeve 56, and the three screws 57 are respectively screwed in from the inside of the front basket 48. Pass through the mounting fitting 49, the sleeve 56, and the mounting holes 40a, 40b, 40b, and screw them into the threaded holes 55c, 55d, 55d of the mounting support plate 55 to tighten the front basket 48 (refer to FIG. 11 ).

Since the upper threaded hole 55c and the lower threaded holes 55d and 55d of the mounting support plate 55 connecting the front basket 48 and the front top cover plate 40 are integrally formed, the installation position of the front basket 48 and The posture will not affect the accuracy of the frame, and will not impose high precision requirements on the frame.

Since the front basket 48 is connected to the mounting bracket 55 together with the front top cover 40, the number of parts can be reduced.

In the case where the front basket 48 is not installed, only the front top cover plate 40 can be connected to the installation support plate 55 with screws 57, and the front basket 48 can be used as an optional part.

The installation support plate 55 used to install the above-mentioned front basket 48 is fixed on another installation piece 51 protruding from the main pipe 3 with bolts, but it can also be installed from the back of the body plate 60a of the installation support plate 60 as shown in Figure 18. The protruding mounting piece 60b is directly welded on the head pipe 3 .

In the modified example shown in FIG. 18 , the same reference numerals are used for the same members as those of the above-mentioned embodiment, such as the front basket 48 and the front top cover 40 .

In the substantially central portion of the above-mentioned vehicle frame 2, the main pipe 4, the seat cross brace 6, and the rear stay 8 constitute a triangular space in side view, and a box member 33 is fitted and supported in the triangular space. 33 is formed integrally with the battery box 34 and the tool box 35 as mentioned above. As shown in FIG. 14 (right side view of the box member 33) and FIG. 15, the substantially triangular right side wall 33a is recessed to the left in a vertically long rectangular shape at its center to form a battery box 34, and on its front side The tool box 35 is generally concaved to the left in a square shape.

Therefore, the battery box 34 and the tool box 35 have openings on the right side, and the four mounting holes 33b provided at the peripheral edge of the right side wall 33a are fixed on the mounting brackets provided on the vehicle frame 2 with screws, thereby fixing the box member 33. .

A cover member 38 is added to the right side wall 33 a so as to close both openings of the battery box 34 and the tool box 35 .

In the upper part of the right side wall 33a of the box member 33, a threaded hole 33c for mounting the cover member 38 is formed, an engaging hole 33d as a longitudinal hole is formed in the front, and a pivot retaining piece 33e is formed in the lower part.

As shown in FIGS. 16 and 17 , one cover member 38 has a shape that simultaneously closes the elongated rectangular opening of the battery box 34 and the square opening of the tool box 35 , and corresponds to the threaded hole 33 c on the right side wall 33 a of the box member 33 . There is a mounting hole 38a, an engaging piece 38b is protrudingly formed corresponding to the engaging hole 33d, and a pivot 38c is formed corresponding to the pivot holding piece 33e.

The front end of the engagement piece 38b forms an engagement claw.

The pivot 38c of the cover member 38 is fitted in advance to the pivot holding piece 33e at the lower part of the box member 33, and the cover member 38 is connected so that it can swing around the lower pivot 38c.

Then, the cover member 38 is swung and contacted on the right side of the box member 33, and the engaging piece 38b is inserted into the engaging hole 33d in the front portion of the right side wall 33a to engage, and the cover is closed on the battery case 34 and the tool case 35. , thread the screw through the mounting hole 38a corresponding to the upper threaded hole 33c for screw engagement and fixation.

To open the lid member 38, the box member 38 can be easily opened and closed by performing the reverse operation.

Except for the tool 37 accommodated in the tool box 35, only the screwdriver 58 is held in a case 59 formed on the bottom plate 32a of the seat 32 (see FIG. 1 ).

Therefore, during maintenance, open the vehicle seat 32 from above and take out the screwdriver 58, loosen the mounting screws of the right side cover plate 44, take off the side cover plate 44, and then loosen the screws of the cover member 38 to open the cover member 38. The tool 37 is taken out of the tool box 35 .

This is good for maintainability.

Since the tool box 35 and the small item storage box 31 are separately provided, the capacity of the small item storage box 31 under the vehicle seat can be fully ensured.

Since the tool box 35 is integrally formed with the battery box 34, the weight of the battery 36 and the tool 37 can be concentrated. In addition, since the tank member 33 is provided below the fuel tank 30, the heavy objects of the battery 36 and the tool 37 can be arranged at a relatively low position of the vehicle body, and the center of gravity can be lowered.

Since the tool box 35 and the battery box 34 are integrally formed as the box member 33, the number of parts can be reduced.

Claims (6)

1. A frame structure of a two-wheeled motor vehicle, the internal combustion engine is suspended at the lower part of a main pipe, and a pair of auxiliary pipes on the left and right are connected at the rear of the main pipe to form a vehicle frame; it is characterized in that: The auxiliary pipe is a pipe with a square cross section, a plate with a flat surface is welded to the rear side of the main pipe, and the front portion of the auxiliary pipe is welded to the flat surface of the plate to form a vehicle frame. 2. The frame structure of a motorcycle according to claim 1, wherein said plate is a suspension plate for supporting an internal combustion engine. 3. The frame structure of a motorcycle according to claim 1 or 2, wherein said main pipe is a cylindrical pipe. 4. The frame structure of a two-wheeled motor vehicle according to claim 1, characterized in that: on the head pipe formed at the front end of the above-mentioned main pipe, a mounting support plate with integrally formed upper and lower connecting parts is protruded forward, and the front The upper cover plate and the front basket are superimposed on the mounting support plate in turn, and are connected together by the above-mentioned upper and lower connecting parts. 5. The frame structure of a motorcycle according to claim 1, wherein a tool box integrated with the battery box is provided below the fuel tank supported by the auxiliary pipe. 6. The frame structure of a motorcycle according to claim 5, wherein a screwdriver for attaching and detaching the cover plate is disposed under the seat, which is separate from the tools stored in the tool box.

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