JPH0649471B2 - Saddle type four-wheeled vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saddle type four-wheel vehicle, and more specifically,
Regarding the installation structure of the fuel tank.

b. 2. Description of the Related Art Conventionally, there has been proposed a straddle-type four-wheeled vehicle of a type that straddles and rides, in which an even number of wheels composed of balloon tires are installed at the front and the rear, respectively. Figure 3 shows
It shows an essential part of such a saddle-ride type four-wheel vehicle.

Unlike the two-wheeled vehicle, the saddle-ride type four-wheeled vehicle has a relatively large space between the rear wheels 1 and 1 and under the seat 2, so that the fuel tank 3 and the air cleaner 4 are provided in the space. It is installed.

In addition, in such a saddle-ride type four-wheel vehicle, the intake port 6 of the intake pipe 5 communicating with the air cleaner 4 is located in the front upper part of the vehicle body and covered with the cleaner cap 7, and the muddy water scattered by the front wheels 8 and the like. A splash board 9 is arranged between the intake port 6 of the intake pipe 5 and the front wheel 8 in order to prevent the intrusion of the exhaust gas into the intake port 6. In FIG. 3, 10 is a front fender, 11 is an engine, and 12 is an upper frame.

c. DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-mentioned straddle-type four-wheel vehicle, the fuel tank 3 requiring a large installation space is replaced by the air cleaner 4, the battery, the tool storage box, the oil tank (these are not shown in the figure. No.), etc., so that they are installed in the rear part of the vehicle body, and the arrangement of these makes the arrangement complicated.

Therefore, it is difficult to design the layout, and the work of attaching and detaching the components is very troublesome at the time of repair.

Further, in the above-described saddle-ride type four-wheel vehicle, the number of parts is large because the splash plate 9 is required.

For this reason, the assembling work of the saddle-ride type four-wheeled vehicle is complicated and the cost is increased.

Therefore, in order to simplify the arrangement of various equipment in the rear part of the vehicle body, conventionally, a fuel tank is arranged in front of the vehicle, a recess is provided in the fuel tank, and an air cleaner is provided in the recess. A four-wheel vehicle in which the intake port of the intake pipe is located is proposed.

However, these conventional four-wheeled vehicles have a drawback that the capacity is reduced because the fuel tank is provided with the recess. For this reason, it becomes difficult to obtain a sufficient capacity of the fuel tank, and in particular, the front wheel load becomes small, which causes a problem that the running performance is deteriorated.

The present invention has been made in view of the above circumstances, and a straddle that can secure a sufficient capacity of the fuel tank while improving the traveling performance of the vehicle while facilitating the assembly work. The purpose is to provide a four-wheeled vehicle.

d. Means for Explaining the Problems In order to achieve the above object, the present invention provides a vehicle body frame having front and rear wheels and front and rear wheels formed of balloon tires on the front left and right sides of the body frame, and rotatably supporting a steering shaft. A saddle that runs longitudinally on the rough terrain by arranging the seat vertically so that it is located approximately in the center of the body frame from the vicinity of the shaft support portion to the rear thereof, and further, driving the wheels by the engine mounted between the front and rear wheels. In a riding-type four-wheel vehicle, the vehicle body frame is configured in an annular shape in a vehicle side view by an upper frame, a lower frame, and a front frame and a rear frame that connect the front and rear ends of these upper and lower frames, respectively, and Position the fuel tank in front of the seat above the engine and between the front wheels on the left and right, And the front portion of the fuel tank is located in front of the rear edge of the wheel and above the upper edge of the front wheel, and the front portion of the fuel tank is further opened upward in the rear portion of the fuel tank. Is formed, and a part of the upper open end of the intake pipe that guides fresh air to the air cleaner arranged at the rear of the engine is made to reside inside the recess of the fuel tank.

e. Example An example of a saddle-ride type four-wheel vehicle according to the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 schematically show an embodiment of a straddle-type four-wheel vehicle according to the present invention.

The straddle-type four-wheel vehicle 20 according to the present embodiment is of a type that is straddled and is equipped with wheels 21, 21, 22, and 22 formed of two balloon tires on each of the front left and right sides and the rear left and right sides.

That is, the straddle-type four-wheel vehicle 20 includes front and rear wheels 21, 21, formed of balloon tires on the front left and right and the rear left and right of the body frame 23.
The seat 22 and 22 is provided so as to be positioned substantially in the center of the body frame 23 from the vicinity of the shaft support portion 24a of the body frame 23 that rotatably supports the steering shaft 24 toward the rear.
25 is arranged vertically and is configured to drive the wheels 21, 21, 22, 22 by an engine 26 mounted between the front and rear wheels 21, 21, 22, 22 to travel on rough terrain.

Further, the vehicle 20 of the present embodiment has its body frame 23
The upper frames 27, 27, the lower frames 28, 28, and the front frames 29, 29 and the rear frames 30, 30 that connect the front and rear ends of these upper and lower frames, respectively, are configured in an annular shape in a vehicle side view.

Moreover, in the vehicle 20 of the present embodiment, the fuel tank 31 is disposed in the upper frame 27, 27 in front of the seat 25, above the engine 26 and between the left and right front wheels 21, 21. The front part 31a of the fuel tank 31 is seen from the side of the vehicle, and the front wheels 21 and 21 are located in front of the rear edges 21a and 21a and the front wheels 2
It is located above the upper edges 21b, 21b of 1,21.

As a result, the air cleaner 33 and other various parts installed at the rear of the vehicle body can be seated with plenty of space.
25 Installed below.

Furthermore, in the vehicle 20 of this embodiment, the fuel tank
A recess 32 that opens upward is formed in the rear portion 31b of the engine 31, and a part of a front opening end 35 of an intake pipe 34 that guides fresh air to an air cleaner 33 arranged at the rear of the engine 26 is provided in the recess 32 of the fuel tank 31. It has an internal structure. Fuel tank
A bent portion 37 of the intake pipe 34 is provided in the recess 32 at the rear of 31 and an intake port 35 of the intake pipe 34 is opened above the rear portion of the fuel tank 31.

As a result, the fuel tank 31 prevents infiltration of muddy water or the like scattered by the front wheels 21, 21 into the intake port 35 of the intake pipe 34.

Further, in this embodiment, a space in front of the rear edges 21a, 21a of the front wheels 21, 21 which is normally a dead space and above the upper edges 21b, 21b of the front wheels 21, 21 is used, and the fuel is put in the space. The front portion 31a of the tank 31 is extended so as to secure the capacity reduced by the recess 32 of the fuel tank 31.

Therefore, it is possible to increase the front wheel load without reducing the capacity due to the presence of the recess 32 of the fuel tank 31, and thus to improve the running performance of the vehicle 20.

In FIGS. 1 and 2, 36 is a carburetor, 37 is a front cover, and 38 is a rear cover.

f. As described above, according to the straddle-type four-wheel vehicle according to the present invention, front and rear wheels of the vehicle body frame are provided with front and rear wheels made of balloon tires, and the steering shaft is rotatably supported. The seat is vertically arranged so that it is located substantially in the center of the body frame from the vicinity of the pivotal support portion of the body frame to the rear of the body frame. In a traveling four-wheeled straddle type vehicle, the vehicle body frame is formed in an annular shape in a vehicle side view by an upper frame, a lower frame, and a front frame and a rear frame connecting front and rear ends of these upper and lower frames, respectively. In addition, the fuel tank is located in front of the seat and above the engine and between the left and right front wheels, and And the front portion of the fuel tank is located in front of the rear edge of the wheel and above the upper edge of the front wheel, and is located above the rear portion of the fuel tank. Since a concave portion that opens to the air tank is formed, and a part of the front opening end of the intake pipe that guides fresh air to the air cleaner arranged at the rear of the engine is made to be inside the concave portion of the fuel tank, it is usually a dead space. The front portion of the fuel tank is extended to a space in front of the rear edge of the front wheel and above the upper edge of the front wheel so as to secure the capacity reduced by the recess of the fuel tank. There is.

Therefore, it is possible to increase the front wheel load without reducing the capacity due to the presence of the recessed portion of the fuel tank, and thus to improve the running performance of the vehicle.

Further, according to the present invention, the rear portion of the vehicle body can be simplified by positioning the front portion of the fuel tank in the space in order to effectively utilize the space that has not been used so far. This facilitates layout design in the rear part of the vehicle body, while allowing space for various parts installed in the rear part of the vehicle body,
It will be easier to carry out repairs such as parts replacement.

Furthermore, in the present invention, the fuel tank is positioned between the intake port of the intake pipe communicating with the carburetor and the wheel, and the fuel tank also has the function of the splash board. This eliminates the need for a splash board, so that the number of parts can be reduced, so that the assembling work can be facilitated and the cost can be reduced.

[Brief description of drawings]

1 and 2 schematically show an embodiment of a straddle-type four-wheel vehicle according to the present invention, and FIG. 1 is a plan view thereof.
FIG. 2 is a side view thereof, and FIG. 3 is a view conceptually showing a main part of a conventional straddle-type four-wheel vehicle. 20 …… saddle-type four-wheel vehicle, 21,21,22,22 …… wheels, 21a …… rear edge, 21b …… upper edge, 23 …… body frame, 24 …… steering shaft, 25 …… seat, 26 …… Engine, 27 …… Upper frame, 28 …… Lower frame, 29 …… Front frame, 30 …… Rear frame, 31 …… Fuel tank, 31b …… Rear, 32 …… Recess, 33 …… Air Cleaner, 34 ... intake pipe, 35 ... open end (intake port).

Claims (1)

[Claims] A body frame is provided with front and rear wheels formed of balloon tires on the front left and right sides and the rear left and right sides of the body frame, and extends from the vicinity of a pivotal support portion of the body frame that rotatably supports a steering shaft toward the rear of the body frame. In a straddle-type four-wheel vehicle in which a seat is vertically arranged so as to be located in the center, and wheels are driven by an engine mounted between the front and rear wheels to drive on rough terrain, the body frame is replaced by an upper frame. The lower frame and the front frame and the rear frame that connect the front and rear ends of these upper and lower frames are formed into an annular shape in a vehicle side view. Moreover, the fuel tank is located in front of the seat and above the engine. It is located above and between the left and right front wheels and is mounted on the upper frame, and the front part of the fuel tank is In a side view, the front wheel is positioned so as to extend in front of the rear edge of the front wheel and above the upper edge of the front wheel, and further, a concave portion that opens upward is formed in the rear portion of the fuel tank, and is disposed behind the engine. A straddle-type four-wheel vehicle characterized in that a part of a front opening end of an intake pipe for introducing fresh air to an air cleaner is provided in a recess of the fuel tank.