JPS62184983A - Frame structure of motorcycle - 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 (Technical Field of the Invention) The present invention relates to a frame structure of a motorcycle, in particular, to a frame structure of a motorcycle, in particular, to a frame structure of a motorcycle.
The present invention relates to a motorcycle frame structure made of a main tubular member.

(Prior Art and Problems) Conventionally, the fuel tank 11 has been fixed on a frame 5 made of a single round pipe, as shown in FIGS. 17 and 18. The fuel tank 11 is attached to the frame 5 with bolts 3 using brackets 18 provided on both its front and rear sides.
Fix it at 6. The round tube material forming the frame 5 has an extremely small diameter compared to the small size of the fuel tank 11. Therefore, the round pipe material constituting the frame 5 has no part for fixing the bracket 18 of the fuel tank.
A corresponding boss 49 is provided, and the fuel tank 11 is fixed to the frame 5 via the boss 49. The boss 49 has a screw hole on its axis into which the bolt 36 is screwed, and is welded to the frame 5.

However, since the boss 49 is required, the fuel tank 1
1 is fixed to the frame 5, several bosses 49 of the bracket 18 of the fuel tank 11 are required.
Since it is necessary to weld these parts to the frame 5, the cost is high, and since the load of the fuel tank 11 is applied to a specific part of the frame 5, there is a drawback that the strength of the frame 5 must be increased accordingly.

(Object of the Invention) This invention was made in view of the above-mentioned circumstances, and it is possible to reduce the number of parts and welding man-hours for fixing elements such as fuel tanks placed on the frame, and to make the frame lighter. An object of the present invention is to provide a frame structure for a motorcycle that can be made compact.

(Structure of the Invention) In order to achieve the above object, the present invention provides a frame structure for a motorcycle consisting of a single tubular member passing through the lower center of the seat and extending θ in the front-rear direction of the vehicle body, the frame structure comprising a lower part of the seat of the frame. A molded plate that integrally forms a mounting portion for auxiliary equipment arranged around the frame is fixed at the position.

(Embodiment of the Invention) Hereinafter, an embodiment of a frame for a motorcycle according to the present invention will be described based on the drawings.

FIG. 1 is a side view of a scooter type motorcycle to which a motorcycle frame structure according to an embodiment of the present invention is applied.

In the figure, reference numeral 1 denotes a scooter-type motorcycle equipped with a plate-shaped step 4 between a handle 2 and a seat 3, and the scooter-type motorcycle 1 has a step 4 extending in the longitudinal direction of the vehicle body through the lower center of the seat 3. A frame 5 made of one tubular member (round steel pipe) is provided. The frame 5
The front portion rotatably supports a front fork 7 which rotatably holds a front shaft 6 via a head pipe (not shown). The front part of a power unit 8 which integrally has an engine and a power transmission system is rotatably connected to the substantially central part of the frame 5 via a pivot shaft (not shown), and the rear part of the power unit 8 is connected to the rear @9. It is rotatably held and at the same time supported swingably via a rear suspension 10 of the frame 5.

FIG. 2 shows a portion of the frame 5 located at the rear of the vehicle body, which includes a fuel tank 11. Battery 12, carrier 13. An inner fender 14 and a rear fender 15 are fixed to the frame 5 via a molded plate 16 welded to the frame 5. The seat 3 is attached to the fuel tank 11. It is installed on the vehicle body so as to cover the upper part of the battery 12, and 17 is the fuel tank 11. Battery 12 and inner fender 1
This is a one side (right side) cover that is installed on the car body so as to cover the side of the car.

The molded plate 16 is a pressed product.

The structure is shown in FIGS. 3 and 4. That is,
The front portion 16a has support walls 19 (
The intermediate part 16b connected to the tank mounting part is connected to the top wall 20 with a nut 21 (
Hooks 23 (see FIG. 7) are fixedly installed (see FIG. 6) and hook both sides of the front part of the inner fender 14 to the side wall 22.
The rear part 16c connected to the battery mounting part is a fixing bolt 25.25' (eighth ) and the fixing bolts 27 (see FIG. 9) of the bracket 26 of the rear fender 15 are fixed, and the bolts 3 are tightened together to fix the stay 29 of the carrier 13 and the bracket 30 of the inner fender 14 to the end wall 28.
1 (see FIG. 10), and a mounting hole forming member 32 for the upper end pin of the suspension is fixed to the side wall 22.

The front part 16a and the middle part 16 of such a molding plate 16
b and the rear part 16c are made of one plate, and the side wall 22 and end wall 28 thereof are integrally formed with the top wall 20.

Then, it is welded to the frame 5 at each window hole 33 portion formed in the top wall 20 and side wall 22.

In addition, on one side wall (right side wall) 22 of the front part 16a, there are a plurality of hooks 34 for holding cables of electrical components (see FIG. 11).
is permanently installed. FIG. 12 shows the cross-sectional shape near part B, FIG. 13 shows the cross-sectional shape near part 6, and
Figure 4 shows the end face shape in the direction of arrow D.

In order to attach the fuel tank 11 to the frame 5 having the molded plate 16 having such a structure, the fuel tank 1
1 on the top wall 20Jl of the front part 16a, align each bracket 18 with the corresponding support wall 19, and use the nut 35 fixed to the support wall 19 to attach the bracket 18 to the support wall. 19 with bolts 36. battery 1
2 is placed on the top wall 20 of the intermediate portion 16b and fixed by screwing the fixing bolt into the nut 21.

Next, both front sides of the inner fender 14 are hooked to the hooks 23, and the brackets 30 of the inner fender 14 are fitted into the bolts 31. Thereafter, the stay 29 of the carrier 13 whose front end is inserted into the holder 37 provided on the side of the seat 3 is fitted into the bolt 31, and a nut is fastened to the bolt 31 to fix the inner fender 14 and the carrier 13. The rear part of the seat 3 is supported by left and right brackets 24, 24' fixed to the frame 5, and the brackets 24, 24' are fixed to bolts 25, 25'.

15 and 16 show the inner fender 14. FIG. The inner fender 14 is a resin molded product,
Each component is integrally formed.

The center part of the top wall 38a of the fender main body 38 has an arc shape in accordance with the outer peripheral surface shape of the frame 5, and standing walls 39, 39' are formed on both sides of the front part.
A slit 40, 40' into which the hook 23 of the forming plate 16 can be inserted is formed at 9'. Further, the above-mentioned bracket 30 is formed at the front end of the fender main body 38, and the above-mentioned molded plate 16 is attached to the bracket 30.
Holes 41 and 41' into which bolts 31 are fitted are formed. A substantially horizontal shelf 43 is formed on one side wall (right side wall) 42 of the fender main body 38, and the shelf 43 is provided with an installation structure for electrical components. In the illustrated case, a connector assembly mounting seat 44 for electrical components and a holder 4 for mounting electrical components
5 is provided. In addition, a large number of mushroom-shaped protrusions 47 are provided on the other side wall (left side wall) 46 of the main body 38, and a separate fender 48 is attached using the protrusions 47.

(Effects of the Invention) In summary, the frame structure of a motorcycle according to the present invention is a frame structure of a motorcycle consisting of one tubular member passing through the lower center of the seat and extending in the longitudinal direction of the vehicle body. At the bottom of the seat, there is a molded plate that integrally forms the mounting part of the auxiliary equipment placed around the frame, so if the element is a fuel tank, the All the brackets need to be bolted together at the mounting part, and therefore, when attaching the fuel tank to the frame, there is no need to weld multiple auxiliary members (boss) to the frame according to the brackets, which is required in the past, resulting in cost reduction. In addition, since the load of the fuel tank is borne by the entire molded plate, the load of the fuel tank is not concentrated locally on the frame, but is applied to the whole frame, and the influence of the load on the frame is avoided. , the frame can be made lightweight and compact.

[Brief explanation of drawings]

FIG. 1 is a side view of a scooter-type two-axle motor vehicle to which a motorcycle frame structure according to an embodiment of the present invention is applied;
3 is an enlarged plan view of the molded plate, FIG. 4 is an enlarged side view of the same, FIG. 5 is a sectional view taken along the line V-V of FIG. 4, and FIG. The figure is a sectional view taken along the line VI-VI of Fig. 4, Fig. 7 is a sectional view taken along the line ■-■ of Fig. 4, Fig. 8 is a sectional view taken along the line ■-■ of Fig. 3, and Fig. 9 is a sectional view taken along the line ■-■ of Fig. 4. 10 is a sectional view taken along the line IX-IX of FIG. 4, FIG. 11 is a sectional view taken along the Xl-type line of FIG. 4, and FIG. Fig. 13 is a sectional view of the vicinity of the C section in Fig. 4, Fig. 14 is a view taken along arrow D in Fig. 4, Fig. 15 is a perspective view of the inner fender, Fig. 16 is a sectional view of the same essential part, and Fig. 16 is a sectional view of the same main part. FIG. 17 is a vertical sectional side view showing how the conventional fuel tank is installed. FIG. 18 is a side view of FIG. 17. 5... Frame, 11... Fuel tank, 16...
Molded plate 19...support wall.

Claims (1)

[Claims] 1. Passing through the lower center of the seat and extending in the longitudinal direction of the vehicle body.
A frame structure for a motorcycle consisting of a tubular member, in which a molded plate that integrally forms a mounting part for auxiliary equipment arranged around the frame is fixed to the lower part of the seat of the frame. A motorcycle frame structure characterized by: