JPS63291780A - 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 (Industrial Application Field) The present invention relates to a motorcycle having a seat support frame formed separately from a main frame and supported by the main frame so as to extend rearward from the main frame. It is something.

(Background of the Invention) In conventional motorcycles that have a main frame that extends from the steering wheel pipe to near the front end of the rear wheel,
A seat rail is fixed so as to extend toward the rear from the middle of the main frame, and the driver's seat is fixed to this seat rail. This seat rail not only bears the weight of the driver, but also has rear wheel fenders, taillights, etc. attached to it, so it must be made to be sufficiently rigid.

On the other hand, it is conceivable to install a fuel tank on the seat rail, but in this case, the load applied to the seat rail will further increase, and this will cause problems such as reinforcement near the seat rail, which will complicate the structure and increase weight. .

(Object of the invention) This invention was made in view of the above circumstances,
The purpose of the present invention is to provide a motorcycle that simplifies the frame structure of the vehicle body by integrating the supporting member of the driver's seat, the fender, and the fuel tank, thereby ensuring sufficient rigidity and at the same time reducing the weight. .

(Structure of the Invention) According to the present invention, this object is achieved by providing a main frame that slopes diagonally downward and rearward from the steering head pipe to near the front end of the rear wheel, and a slope descending portion located at the rear upper part of the main frame. It includes a seat support frame whose front part is supported and extends rearward, and a seat attached to the upper part of the seat support frame, and the seat support frame is connected to an inner bottom plate bent to have an approximately inverted U-shaped cross section, and left and right sides of the seat support frame. The lower surface of this seat support frame serves as the fender for the rear wheel, while the space located on the upper side of the rear wheel and surrounded by the inner bottom plate and the left and right side plates is used as the fuel tank. This is achieved by a motorcycle characterized by a storage space. The present invention will be described in detail below based on the drawings.

(Embodiment) FIG. 1 is a partially sectional side view of an embodiment of the present invention. In this figure, reference numeral 10 indicates a vehicle body frame, and this vehicle body frame 10 includes a steering head pipe 12.
and upper tube 14 as a pair of left and right main tubes.
and a lower tube 16 (only one of which is shown in FIG. 1). Upper tube 14 is head pipe 1
2, it slopes downward and rearward in a substantially straight line until it reaches the vicinity of the front end of the rear wheel 22. The first half of upper tube 14 is tank rail 14
a, and the latter half is bent downward like a fishhook in front of the rear wheel 22.

18 is a front and rear V-type engine, and this engine 18 is
The lower tube 16 passes through both left and right sides of this engine 18.
and is supported by the lower end 14b of the upper tube 14. Note that 20 is a front wheel, and 22 is a rear wheel.

Reference numeral 24 denotes a front fuel tank, and the back side of the front portion of this fuel tank 24 bulges downward from between the pair of tank rails 14a (only one is shown in the figure).

A recess is formed on the rear back side of this tank 24, and a surge tank 26 is disposed in this recess. Intake pipes 28 . 28 of the engine 18 extend upwardly from opposite sides of each cylinder, and the upper ends of the intake pipes 28 . 28 are connected to the surge tank 26 . 30 is each intake pipe 28.2
This is an air purifier located between 8 and 8.

Reference numeral 40 denotes a seat support frame, which is formed so that its side surfaces are approximately horizontally elongated and inverted triangular. The seat support frame 40 is removably supported by the upper tube 14 so that its front portion, that is, the oblique side on the lower front side thereof, is along the inclined descending portion of the upper crosspiece portion of the upper tube 14. A vertically long driver's seat 42 is mounted on the seat support frame 40, and a straddle fender 44 and a taillight 46 are mounted at the rear.

Next, the seat support frame 40 will be explained. Figure 2 shows the seat support frame 40 and the driver's seat 42, with only the driver's seat 42 in section.
FIG. 3 is a plan view of the seat support frame with the driver's seat 42 removed, and FIGS. 4 and 5 are cross-sectional views taken along the line mV-IVV and V-V in FIG. 2. . As is clear from FIG. 2.4, the seat support frame 40 is of a sheet metal type and has a monocoque structure. That is, an inner bottom plate 48 is bent so that the cross-sectional shape is an inverted U-shape in a plane transverse to the vehicle body, and an outer plate 50 is bent to cover the outside of the inner bottom plate 48, that is, the left, right, and upper sides. The peripheral edges of both plates 48 and 50 are welded to each other to form a substantially monadic shape. That is, in this embodiment, a part of the outer panel 50 serves as a side panel. Concave portions 52.52 are formed on both left and right side surfaces of the outer panel 50, and the concave portions 52.52 are depressed toward the closed section side.
2 has the effect of increasing the rigidity of the outer plate 50.

At the front apex of the inverted triangle formed by the outer panel 50, a pair of left and right brackets 54, 54 (Fig. 2.3) are attached to the outer panel 50.
A pair of left and right brackets 56, 56 are welded to the lower apex of 0, and small pipes 58, 60 are welded to each of these brackets 54, 56, respectively. The seat support frame 40 is attached to the main frame lO by bolts (not shown) passing through these small pipes 58 and 60.
It is removably attached to the upper tube 14 of.

In this embodiment, the upper surface 62 of the outer panel 50 also serves as a part of the bottom plate of the driver's seat 42, as is clear from FIG. That is, there are stepped portions 64.6 on the left and right upper edges of the outer panel 50.
4 is formed, and this step 64.64 upper and upper surface 62
A seat edge plate 6 formed to extend forward and backward.
6 is welded to the upper surface of the outer plate 50. In other words, the seat edge plate 66 is cut out at its center, and the upper surface 62 and the seat edge plate 66 form the bottom plate of the seat 42. The bottom plate thus formed is covered with an outer skin 70 with the cushion material 68 sandwiched therebetween, and the outer skin 70 wraps around the peripheral edge of the seat edge plate 66 so that the seat edge plate 6
6 is locked.

The inner bottom plate 48 and the outer plate 50 are welded together along their entire periphery.

The closed space formed between these two plates 48 and 50 is the second,
As shown in FIG. 4, they communicate with each other on the back side of the driver's seat 42.

The space between the inner bottom plate 48 and the outer plate 50 is located on the upper side of the rear wheel 22, and this space serves as a rear fuel tank 72, which is a fuel tank according to the present invention. That is, as shown in FIG. 1, the front end of this closed space and the rear end of the fuel tank 24 are communicated through a pipe 74, while the bottom of this closed space, that is, the seat support frame 40, is attached to the upper tube 14. A fuel cock 76, which is a fuel outlet, is attached near the small vibro 0, which is the lower attachment part. In FIG. 1.2.3, 78 is a handle welded to the rear end of the seat support frame 40.

In this embodiment, the inner bottom plate 48 and the outer plate 5 of the seat support frame 40 are
0 is used as it is as the rear fuel tank 72, but the rear fuel tank may be formed by blow molding synthetic resin on the inner surface of this closed space.

FIG. 6 is a sectional view of an embodiment using such blow molding. In this embodiment, a rear fuel tank 82 made of synthetic resin is blow molded with an elastic material 80 interposed therebetween. Therefore, the tank 82 is effectively protected from impact by the elastic material 80.

In FIG. 7, left and right rear fuel tanks 84, 84 are formed independently, and each is connected to the seat support frame 4 through an elastic material 86.
It is stored within 0. In FIG. 6.7, the same parts as those in FIG. 4 are given the same reference numerals, so their description will not be repeated.

In each of the above embodiments, a part of the upper surface 62 of the outer panel 50 is used as the bottom plate of the seat 42, but the outer panel is divided into left and right halves and connected to a single bottom plate. It is also possible to configure

FIG. 8 is a sectional view of such an embodiment, and in this figure, reference numeral 88 indicates the bottom plate of the sheet 42 made of one plate-like member;
90.90 is a pair of left and right side plates. This side plate 90.9
A space is formed within the seat support frame 40 by connecting the upper edge of the seat support frame 40 to the bottom plate 88 . According to this embodiment, the side plates 90, 90 can be easily press-formed, resulting in good productivity. In this figure, parts corresponding to those in FIG. 4 are designated by the same reference numerals, so their description will not be repeated.

FIG. 9 is a partially sectional side view of a main part of another embodiment of the present invention, and FIGS. It is a cutting line sectional view. This embodiment has a pair of left and right side plates 9 connected to the bottom plate 88 of the driver's seat 42, similar to the embodiment shown in FIG.
2 (only the left side is shown in the figure), and an article storage chamber 94 that recesses inward is formed in this side plate 92 (see FIG. 10). For example, a CDI unit (capacitor discharge type ignition device) 96 is housed in the article storage chamber 94, and an outer plate 98 is attached to the article storage chamber 94. That is, there are three small holes 100 in the article storage chamber 94.
(See FIG. 9) are formed, and annular elastic members 102 are fixed to these small holes 100, respectively, as shown in FIG.
04 is provided in a protruding manner to face the small hole 100. Therefore, the protrusion 104 of the outer panel 98 is inserted into the small hole lo.

When aligned and pushed in, the protrusion 104 passes through the elastic material 102 while deforming the elastic material 102, and the outer panel 98
is fixed in the state shown in FIG.

Note that the seat support frame 40 in this embodiment is attached to the frame 10 so as to open upward. That is, as shown in FIG. 9.11, a stay 106 having a U-shaped cross section is fixed to the front end of the inner bottom plate 48.
The front end of the bracket 1 is welded to the cross pipe 108 extending between the pair of left and right tank rails 14a.
It is rotatably supported on the shaft at 10. Further, in FIG. 9, 112 is a cross pipe extending between the upper tubes 14, and 114 is a catch provided on the seat support frame 40. This catch 114 is attached to the cross pipe 112 when the seat support frame 40 is lowered. The seat support frame 40 is positioned by coming into contact with it. Note that 11 in Figure 9.10
Reference numeral 6 denotes a locking mechanism, which includes an upper bracket 118 having a U-shaped cross section welded to the lower end of the seat support frame 40, and a lower bracket inserted between the U-shaped upper bracket 118 welded to the upper tube 14. 120, a hook 122 welded to the upper bracket 118, a lock lever 124 rotatably supported on the lower bracket 120, and the hook attached to the lock lever 124 engages with the hook 122. A lock ring 126 is provided. And lock lever 12
4 to the position shown in Figure 9.10, the lock ring 128
passes the pivot point, that is, the pivot point of the lock lever 124, and the upper and lower brackets 118 and 120 are locked, and the seat support frame 4o is locked in the lowered position. Furthermore, inside the upper bracket 118, there is an elastic material 1 as shown in FIG.
28 is loaded and the upper and lower brackets are engaged when locked) 1.
This elastic material 128 is interposed between 18 and 120.

In FIGS. 9 to 12, the same parts as those in the embodiment shown in FIGS. 1 to 8 are given the same reference numerals, so the description thereof will not be repeated.

Generally speaking, motorcycles have a characteristic that cornering performance deteriorates when a heavy part such as a fuel tank is located far from the center of the vehicle body. According to the embodiment described above, as shown in FIG. 1, the seat support frame 40 is formed to rise obliquely almost along the rear wheel 22 to near the center of the rear wheels 2, 2, and has an inner wall at the rear end. Since the rear fender 22 is attached so as to substantially follow the inverted U-shaped curved surface of the bottom plate 48, the center of gravity of the rear fuel tank 72 does not approach the center of the vehicle body and impair turning performance.

Further, according to the embodiment described above, the fuel cock 76, which is the fuel outlet of the rear fuel tank 72, is arranged near the lower attachment part of the seat support frame 40 to the upper tube 14. 418, the effect is that the fuel pipe can be shortened.

(Effects of the Invention) As described above, the present invention supports the front end of a monocoque seat support frame on the inclined descending part of the main frame extending diagonally downward from the steering head head pipe, and A seat is provided, the inner bottom plate is used as the rear wheel fender, and the space between the inner bottom plate and the side plate is roughly used as a storage space for the fuel tank.
The rigidity of the seat support frame can be sufficiently increased, and since this seat support frame extends above the rear wheel, and the bottom surface is an inner bottom plate, this inner bottom plate can be used as it is for the rear wheel fender. Rational design becomes possible. In addition, a large-capacity fuel tank can be placed above and to the side of the rear wheel by effectively utilizing the high rigidity of the seat support frame, and the frame structure of the vehicle body can be simplified while ensuring sufficient rigidity. At the same time, it is possible to reduce the weight.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view of an embodiment of the present invention, Fig. 2 is a side view of the seat support frame and seat with only the seat sectioned, and Fig. 3 is the seat support with the seat removed. The plan view of the frame, Figures 4 and 5 are I in Figure 2.
A sectional view taken along the line V-IV and a sectional view taken along the line V-V, FIGS. 6, 7, and 8 are sectional views showing other embodiments, and FIG. 9 is a part of the main part of still another embodiment. Sectional side view, No. 10.11.1
Figure 2 is a sectional view taken along line X-X and X-X in Figure 9, respectively.
They are a line cross-sectional view and a ■-■ line cross-sectional view. lO...Frame, 14...Upper frame as main frame, 40...
...Seat support frame, 42...Driving seat, 48...Inner bottom plate 50...Outer plate that also serves as side plate, 72.82.84...Fuel tank, 76...Fuel as fuel outlet Cook, 90...
side plate.

Claims (2)

[Claims] (1) A main frame that slopes downward and rearward from the steering head pipe to near the front end of the rear wheel, and a seat that extends rearward and whose front portion is supported by a sloped descending section located at the upper rear of this main frame. The seat support frame is provided with a support frame and a seat attached to the upper part of the seat support frame, and the seat support frame is formed into a monocoque structure with an inner bottom plate bent into a substantially inverted U-shaped cross section and left and right side plates. A motorcycle characterized in that the lower surface of the seat support frame is used as a fender for the rear wheel, and the space located on the upper side of the rear wheel and surrounded by the inner bottom plate and the left and right side plates is used as a storage space for a fuel tank. . (2) The seat support frame extends diagonally upward and rearward from near the lower attachment point to the main frame, and the fuel outlet of the fuel tank is located near the lower attachment point of the seat support frame to the main frame. A motorcycle according to claim 1, characterized in that: