JPH0512193B2 - - Google Patents

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 extending from the steering head pipe to near the front end of the rear wheel, a seat rail is fixed so as to extend rearward from the middle of the main frame. The sheet is fixed. These seat rails not only bear the weight of the driver, but also have rear wheel fenders, taillights, etc. attached to them, so they must be made to be sufficiently rigid.

The fuel tank, on the other hand, is usually mounted behind the steering headpipe. However, in order to increase the fuel tank capacity, it is conceivable to provide a separate fuel tank below the driver's seat. For example, it is conceivable to provide a fuel tank on the seat rail, but in this case, the load applied to the seat rail will further increase, resulting in the problem that the structure will be complicated and the weight will increase due to reinforcement near the seat rail.

(Purpose of the Invention) This invention was made in view of the above circumstances, and is applicable to the case where a fuel tank separate from the front fuel tank located behind the steering head pipe is provided below the driver's seat. The purpose of the present invention is to provide a motorcycle that simplifies the frame structure of the vehicle body by integrating the support member, the fender, and the fuel tank, thereby ensuring sufficient rigidity and at the same time reducing the weight.

(Structure of the Invention) According to this invention, this purpose is to
A main frame that slopes downward and backward from the head pipe to near the front end of the rear wheel, a front fuel tank mounted on the front part of this main frame, and a front part mounted on an inclined descending part located at the rear of the main frame. A seat support frame is supported and extends rearward, and a seat is attached to the upper part of the seat support frame. The lower surface of this seat support frame serves as a 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 a storage space for a fuel tank. This is achieved by a motorcycle characterized by the following. The present invention will be explained 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 denotes a vehicle body frame, and this vehicle body frame 10 includes a steering head pipe 12, an upper tube 14 and a lower tube 1 as a pair of left and right main tubes.
6 (only one of them is shown in FIG. 1). The upper tube 14 slopes obliquely downward and rearward from the head pipe 12 in a substantially straight line and reaches near the front end of the rear wheel 22. The first half of the upper tube 14 becomes a tank rail 14a, and the second half is bent downward in a fishhook shape in front of the rear wheel 22. 18 is front and rear V
type engine, and this engine 18 has the lower tube 16 passing on 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 upward from opposing surfaces 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 2
This is an air purifier located between 8 and 28.

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 lower oblique side of the front side thereof, is along the inclined descending portion of the upper rear portion of the upper tube 14. A vertically long driver's seat 42 is mounted on the seat support frame 40, and a rear fender 44 and a taillight 46 are mounted at the rear.

Next, the seat support frame 40 will be explained. FIG. 2 is a side view of the seat support frame 40 and the driver's seat 42 with only the driver's seat 42 cut away, and FIG. 3 is a side view of the driver's seat 42.
FIGS. 4 and 5 are a plan view of the seat support frame with the seat support frame 2 removed, and a sectional view taken along the - line and a sectional view taken along the line V-V in FIG. 2, respectively. As is clear from FIGS. 2 and 4, the seat support frame 40 is made of sheet metal and has a monocot structure. That is, the inner bottom plate 48 is bent so that the lower cross-sectional shape is inverted U-shaped in the plane transverse to the vehicle body, and the outer plate 5 is bent so as to cover the outside of the inner bottom plate 48, that is, the left, right, and upper sides.
0, and 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.
Recesses 52, 52 are formed on both left and right side surfaces of the outer panel 50, and the recesses 52, 52 are recessed toward the closed cross-section side, and these recesses 52, 52 have the effect of increasing the rigidity of the outer panel 50. Outer panel 5
A pair of left and right brackets 54, 54 (Figs. 2 and 3) are welded to the front vertices of the inverted triangle formed by 0, and a pair of left and right brackets 56, 56 are welded to the lower vertices of the outer panel 50. Each of these brackets 5
Small pipes 58 and 60 are welded to 4 and 56, respectively. The seat support frame 40 is removably attached to the upper tube 14 of the main frame 10, as described above, by bolts (not shown) passing through the small pipes 58, 60.

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, step portions 64, 64 are formed on both left and right upper edges of the outer panel 50, and the step portions 6
4,64 A seat edge plate 66 formed to extend upward and forward and rearward of the upper surface 62 is attached to the outer panel 50.
is welded to the top surface. 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 formed in this manner is covered with an outer skin 70 with the cushion material 68 sandwiched therebetween.
is locked to the seat edge plate 66 so as to wrap around the circumferential edge of the seat edge plate 66.

The inner bottom plate 48 and the outer plate 50 are welded together along the entire periphery,
The closed space formed between these two plates 48 and 50 communicates with each other on the back side of the driver's seat 42, as shown in FIGS. 2 and 4.

The space between the inner bottom plate 48 and the outer plate 50 is the space between the rear wheel 22
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 pipe 7 is located between the front end of this closed space and the rear end of the fuel tank 24.
At the bottom of this closed space, that is, near the small pipe 60 which is the lower attachment part for attaching the seat support frame 40 to the upper tube 14, a fuel pot 76 which is a combustion outlet is attached. .
Note that in FIGS. 1, 2, and 3, 78 is a handle welded to the rear end of the seat support frame 40.

In this embodiment, the inner bottom plate 48 of the seat support frame 40
Although the closed space between the outer panel 50 and the outer panel 50 is used as it is as the rear fuel tank 72, 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 made of elastic material 8.
0 provides effective protection from impact.

In FIG. 7, left and right rear fuel tanks 84, 84 are formed independently, and each is accommodated in the seat support frame 40 via an elastic member 86. In FIGS. 6 and 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, the upper surface 6 of the outer panel 50
2 is used as the bottom plate of the seat 42, but it is also possible to configure the outer plate to be divided into left and right halves and connected to a single bottom plate.

FIG. 8 is a sectional view of such an embodiment, and in this figure, 88 is the bottom plate of the sheet 42 made of one plate-like member, and 90, 90 are a pair of left and right side plates. A space is formed within the seat support frame 40 by connecting the upper edges of the side plates 90, 90 to the bottom plate 88. According to this embodiment, the side plate 90,
Press molding of 90 becomes easier and productivity becomes better. 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. -XII line sectional view. This embodiment is similar to the embodiment shown in FIG.
8, a pair of left and right side plates 92 (only the left side is shown in the figure) are provided, and an article storage chamber 94 that recesses inward is formed in the side plates 92 (see FIG. 10). This article storage chamber 94 contains, for example, a CDI unit (capacitor discharge type ignition device) 9.
6 is stored in this article storage chamber 94, and an outer panel 98 is stored in this article storage chamber 94.
is covered. That is, three small holes 100 (see FIG. 9) are formed in the article storage chamber 94,
As shown in FIG. 12, annular elastic members 102 are fixed to each of these small holes 100, while protrusions 104 with swollen tips are protruded from the back surface of the outer panel 98 so as to face the small holes 100. has been done. Therefore, when the protrusion 104 of the outer panel 98 is aligned with the small hole 100 and pushed in, the protrusion 104 passes through the elastic member 102 while deforming the elastic member 102, and the outer panel 9
8 is fixed in the state shown in FIG.

Note that the seat support frame 40 in this embodiment is as follows:
It is attached to the frame 10 so as to open upward. That is, as shown in FIGS. 9 and 11, a stay 106 having a U-shaped cross section is provided at the front end of the inner bottom plate 48.
is fixed, and the front end of this stay 106 is rotatably supported by a bracket 110 welded to a cross pipe 108 extending between the pair of left and right tank rails 14a. 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. This is to position the seat support frame 40 by making contact with it. In FIGS. 9 and 10, reference numeral 116 is a locking mechanism, which is located between an upper bracket 118 having a U-shaped cross section welded to the lower end of the seat support frame 40 and a U-shaped upper bracket 118 welded to the upper tube 14. A lower bracket 120 that enters into the upper bracket 120, a latch 122 welded to the upper bracket 118, a lock lever 124 rotatably supported by the lower bracket 120, and a lock ring that is attached to this lock lever 124 and engages with the latch 122. 126. Then, when the lock lever 124 is rotated to the position shown in FIGS. 9 and 10, the lock ring 126 is
passes the pivot point, that is, the pivot point of the lock lever 124, and the upper and lower brackets 118 and 120 become locked, and the seat support frame 40 is locked in the lowered position. Note that the upper bracket 118 has a first
As shown in FIG. 0, an elastic material 128 is loaded, and this elastic material 128 is interposed between the upper and lower brackets 118 and 120 when locked.

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 along the rear wheel 22 to near the center of the rear wheel 22, and has an inner bottom plate 48 at its rear end. Since the rear fender 22 is mounted so as to substantially follow the inverted U-shaped curved surface of the rear fuel tank 72, the center of gravity of the rear fuel tank 72 approaches the center of the vehicle body and does not impair turning performance.

Further, according to the embodiment described above, the rear fuel tank 7
Since the fuel outlet 76, which is the fuel outlet of No. 2, is arranged near the lower attachment part of the seat support frame 40 to the upper tube 14, this fuel outlet is connected to the engine 18.
This has the effect of shortening the length of the fuel pipe.

(Effects of the Invention) As described above, the present invention supports the front end of a seat support frame having a monocot structure on the inclined descending part of the main frame extending obliquely downward and rearward from the steering head pipe, and the driver's seat is mounted on the upper part of the seat support frame. The inner bottom plate is used as a rear wheel fender, and the space between the inner bottom plate and the side plate is used as a storage space for the fuel tank, so the front fuel tank mounted on the front of the main frame and Separate fuel storage space can be secured and tank capacity can be increased. In addition, the monokotsukku structure makes it possible to sufficiently increase the rigidity of the seat support frame, and this seat support frame extends above the rear wheels.
Since the lower surface is an inner bottom plate, it is possible to make a rational design by using this inner bottom plate as it is as a fender for the rear wheel. 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 the - line sectional view and - in Figure 2.
6, 7 and 8 are sectional views showing other embodiments, and FIG. 9 is a partially sectional side view of main parts of another embodiment, 10th, 11th, 12th The figures are respectively a - line sectional view in Fig. 9 and a -XI- line sectional view in Fig. 9.
They are a sectional view taken along the line XI and a sectional view taken along the line XII-XII. DESCRIPTION OF SYMBOLS 10...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 intake Fuel outlet as an outlet, 90...side plate.

Claims (1)

[Scope of Claims] 1. A main frame that slopes diagonally downward and rearward from the steering head pipe to near the front end of the rear wheel, a front fuel tank mounted on the front part of this main frame, and a rear part of the main frame. The seat support frame is provided with a seat support frame whose front part is supported by an inclined descending part located at the top and which extends rearward, and a seat attached to the upper part of the seat support frame, and the seat support frame is folded into a substantially inverted U-shaped cross section. The seat support frame is formed into a monocot structure with a curved inner bottom plate and left and right side plates, and the lower surface of this seat support frame serves as a fender for the rear wheel. A motorcycle characterized in that the enclosed space is used as a storage space for a fuel tank. 2. The seat support frame extends obliquely upward and rearward from the vicinity of 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 and is located near the lower attachment point of the seat support frame to the main frame. 2. The motorcycle according to claim 1, wherein the motorcycle is disposed below an intake pipe of the motorcycle.