JPH0335154B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Industrial Application Field The present invention relates to a four-wheeled vehicle, in particular, a four-wheeled vehicle, in which a driving engine with an air cleaner connected to the intake pipe is mounted on the vehicle body, and An intake system for an engine in a four-wheel vehicle for traveling on rough terrain, in which left and right front fenders are disposed above a pair of left and right front wheels suspended on both sides, respectively, to cover the upper surfaces of the front wheels. Regarding.

(2) Conventional technology In general, in rough terrain vehicles that can run on rough terrain, wetlands, snowy areas, etc., the air intake of the intake system of the driving engine is set higher than the running wheels to avoid submersion in water. In addition, in order to reduce the frequency of cleaning and replacing the air cleaner, it is necessary to prevent heavy dirt, dust, and
It was necessary to introduce outside air into the air cleaner after removing as much snow and other particulate matter as possible.

Therefore, as disclosed in, for example, Japanese Utility Model Application Publication No. 59-24624, an air chamber with an intake passage connected to the air cleaner is provided in the gusset for reinforcing the head pipe, and adjacent to the left and right sides of the air chamber, front and rear An air intake passage with both ends open is provided, and an air suction port is opened in the partition wall between both air intake passages and the air chamber, so that the traveling wind flowing through the air intake passage contains almost no particulate matter. A device has been proposed in which air is introduced into an air chamber and from there is further led to an air cleaner via the above-mentioned intake passage.

(3) Problems to be Solved by the Invention The above proposal cannot be applied to a vehicle in which the gusset is covered by the outer panel of the vehicle body. In addition, since the air chamber is flat in the vehicle width direction, the opening position of the intake passage to the air chamber is limited, and furthermore, the particulate matter that enters the air chamber may be trapped in the flat air chamber. Once accumulated at the bottom, it is difficult to be discharged from there. Therefore, because the air suction port and the intake passage opening are close to each other, the particulate matter that has entered the air chamber and accumulated there may be difficult to discharge from there. There was a possibility that it might get into the air cleaner.

The present invention has been proposed in view of the above, and is capable of solving the above-mentioned problems of the conventional ones.
The purpose of the present invention is to provide an intake device for an engine in a wheeled vehicle.

B. Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention includes a vehicle body equipped with a driving engine having an air cleaner connected to its intake pipe, and two air cleaners mounted on both sides of the front of the vehicle body. In a four-wheel vehicle for traveling on rough terrain, the left and right front fenders are disposed above a pair of suspended left and right front wheels to cover the upper surfaces of the front wheels, respectively. forms a pair of left and right air intake passages that take in the running wind flowing along the upper surface of the air intake passages from the front end inlet and discharge it from the rear end outlet. The present invention is characterized in that both ends of an air suction passage extending between the right front fenders are opened, and an intake passage connected to the air cleaner is opened on an inner wall surface of an intermediate portion of the air suction passage.

(2) Effect When the vehicle is running, the wind that flows along the top of the front fender, which has almost no obstacles, can enter the air intake passage with force, so the air intake Particulate matter such as mud, dust, snow, etc. having a large specific gravity is efficiently separated in the inlet passage, and therefore, outside air containing almost no particulate matter is introduced into the air suction passage through the openings at both ends thereof.

In addition, the air suction passage is long and extends between the left and right front fenders, so that particulate matter that inevitably enters the air suction passage can be removed when the vehicle is shaken significantly while driving on rough terrain, etc. Since the air can be effectively discharged to the outside through the lower end of the air suction passage, accumulation of particulate matter in the air suction passage can be prevented. As a result, the long air suction passage has the effect of keeping the air intake passage and the intake passage opening as far apart as possible, and the particulate matter that has entered the air suction passage from the air intake passage can be removed. Outflow to the intake passage side can be effectively prevented.

(3) Embodiments Hereinafter, embodiments in which the present invention is applied to a four-wheel saddle type vehicle as a four-wheel vehicle for traveling on rough terrain will be described with reference to the drawings.

1 to 3, a power unit P including an engine E is mounted in the center of the four-wheel saddle type vehicle, and a pair of steerable front wheels Wf, Wf are mounted on the left and right sides of the front of the vehicle body 1. Also, a pair of rear wheels Wr, Wr are suspended on the left and right sides of the rear, respectively. Each pair of front and rear wheels Wf, Wf, Wr, Wr is equipped with a wide extremely low pressure tire 2, respectively. An air cleaner cover 3 is provided on the vehicle body 1, and a passenger seat 4 is provided behind the air cleaner cover 3. A bonnet 5 that covers the upper surface of the vehicle body 1 is disposed at the front, left and right center of the vehicle body 1, and furthermore, left and right front fenders that cover the upper surfaces of the left and right front wheels Wf, Wf are disposed on the left and right sides of the bonnet 5. 6l and 6r are fixed to the vehicle body 1.
Further, left and right rear fenders 7l and 7r are fixed to the rear left and right sides of the vehicle body 1 to cover the upper surfaces of the left and right rear wheels Wr and Wr on both sides of the seat 4, respectively.

Next, the intake system In connected to the engine will be explained.

At the front part of the vehicle body 1, an air suction passage 8 is provided inside the bonnet 5 and across the bonnet 5. Both left and right ends of this air suction passage 8 reach above the left and right front fenders 6f, 6r. Also left and right front fender 6
Square tubular left and right air intake passages 9, 9 along the front-rear direction of the vehicle body 1 are formed in the raised portions integrally formed to protrude from the upper surfaces of f and 6r. At the front end of the intake passages 9, 9, there are
An inlet 10 for running air flowing along the upper surface of the right front fenders 6f, 6r, and an outlet 11 for the running air are opened at the rear ends thereof.

Both ends of the air suction passage 8 are in direct communication with the inner wall surface of the intermediate portion of each air intake passage 9, substantially perpendicular to the flow of air flowing through the passage 9. Therefore, both ends of the air suction passage 8 becomes the air suction port 12.

A pair of air distribution passages 1 constituting the intake passage of the present invention are provided on the inner wall surface of the intermediate portion of the air suction passage 8.
One end of 3 and 13 is open, and the passage 1
The other ends of air cleaners 3 and 13 extend parallel to each other toward the rear of the vehicle body and are connected to an inlet of an air cleaner 14 disposed on the engine. This intake pipe 15
extends rearward and downward under the air cleaner cover 3 and the seat 4, is bent forward, and is connected to the intake port of the engine E via the carburetor 16.

An exhaust pipe 17 is connected to an exhaust port on the front surface of the engine E, and the exhaust pipe 17 descends in front of the engine E, extends rearward, and is connected to an exhaust muffler (not shown).

Next, the operation of the embodiment of the present invention will be explained.

When the vehicle is running now, the wind flows along the upper surfaces of the left and right front fenders 6l and 6r, and a portion of the wind flows into the left and right air intake passages 9 and 9.
The intake negative pressure of the engine E is generated by sucking the outside air flowing through the left and right air intake passages 9 into the air intake passage 8 and guiding it from the passage 8 into the air cleaner 14 via the distribution passages 13 and 13. After the outside air is purified here, it is led to the carburetor 16 via the intake pipe 15, where an air-fuel mixture is generated and sucked into the intake port of the engine E.

By the way, when a vehicle travels on rough ground, wetland, snowy ground, etc., mud, dust, droplets, etc. mixed in with the driving wind
Particulate matter such as snow enters the air intake passages 9, 9, but since these particulate matters have a higher specific gravity than air, their inertia forces them into the left and right air intake passages 9, 9. There is almost no chance that the air will pass by and be emitted to the rear and be sucked into the air suction passage 8.

In addition, since the air suction passage 8 is long and extends between the left and right front fenders 6f and 6r, particulate matter that inevitably enters the air suction passage 8 may cause the vehicle to sway significantly when driving on rough terrain, etc. At this time, the air can be effectively discharged to the outside through the lower end of the air suction passage 8, and accumulation of particulate matter within the air suction passage 8 can be prevented. Therefore, the long air suction passage 8 has the effect that the air intake passage 9 and the front end opening of the air distribution passage 13 are separated as much as possible, and the air intrusion from the air intake passage 9 into the air suction passage 8 is prevented. Since the particulate matter can be effectively prevented from flowing out toward the air distribution passage 13, it is possible to very effectively prevent the particulate matter from entering the air cleaner 14.

The clean outside air sucked into the air cleaner 14 is purified by the air cleaner 14 and then sucked into the engine E via the carburetor 16.

C. Effects of the Invention As described above, according to the present invention, above the pair of left and right front wheels suspended on both sides of the front part of the vehicle body, left and right front fenders are disposed to respectively cover the upper surfaces of the front wheels. In the four-wheeled vehicle for traveling on rough terrain, the left and right front fenders include:
A pair of left and right air intake passages are formed that take in the running wind flowing along the top surface of the airflow through the front end entrance and exhaust it through the rear end exit. Both ends of the air suction passage extending between the front fenders are opened, and the air intake passage connected to the air cleaner is opened on the inner wall surface of the middle part of the air suction passage, so that the air intake passage is guided to the upper surface of the front fender and is connected to the upper surface of the air suction passage. The wind flowing along the road can be forcefully entered into the air intake passage, and particulate matter such as mud, dust, and snow with a large specific gravity can be efficiently separated in the air intake passage. Outside air containing almost no particulate matter can be introduced into the air suction passage from the air intake passage. In addition, the air suction passage is
Since it extends for a long time between the left and right front fenders, particulate matter that inevitably enters the air suction passage can be removed from the lower side of the air suction passage when the vehicle shakes significantly due to driving on rough terrain, etc. It can be effectively discharged to the outside through the end to prevent particulates from accumulating in the air suction passage, and therefore, the long air suction passage allows the air intake passage and the intake passage opening to be separated from each other. Coupled with the effect of making the air cleaner space as far as possible, it is possible to effectively prevent the above-mentioned particulate matter that has entered the air suction passage from the air intake passage from flowing out to the intake passage side. Since the intrusion of the above-mentioned particulate matter into the air cleaner can be extremely effectively avoided, contamination of the air cleaner by the particulate matter can be reduced, and the frequency of cleaning and replacement thereof can be reduced, resulting in cost reduction and This can contribute to simplifying maintenance.

Further, by extending the air suction passage long between the left and right front fenders, it is possible to increase the degree of freedom in setting the opening position of the air suction passage with respect to the air suction passage.

[Brief explanation of the drawing]

The drawings show one embodiment of the device of the present invention; FIG. 1 is a side view of the main parts thereof, FIG. 2 is a plan view thereof, and FIG. 3 is a perspective view of a straddle-type vehicle equipped with the device of the present invention. It is a diagram. E...Engine, Wf...Front wheel, 1...Vehicle body,
6l, 6r...Left, right front fender, 8...
Air intake passage, 9...Left, right air intake passage, 10
...Inlet, 11...Outlet, 13...Air distribution passage as an intake passage, 12...Air suction port, 14...
...Air cleaner, 15...Intake pipe.

Claims (1)

[Claims] 1 A driving engine E having an air cleaner 14 connected to an intake pipe 15 is mounted on the vehicle body 1, and the vehicle body 1
Above a pair of left and right front wheels Wf, which are suspended on both sides of the front part of the In the car, the left and right front fenders 6f and 6r have a pair of left and right air intake passages 9 that take in the running wind flowing along the upper surfaces of the fenders through an inlet 10 at the front end and discharge it from an outlet 11 at the rear end. Both ends of the air suction passage 8 extending between the left and right front fenders 6f and 6r are opened at the inner wall surfaces of both air intake passages 9, respectively, and an inner wall of the air suction passage 9 is opened in the middle part of the air suction passage 8. An intake device for an engine in a four-wheel vehicle for traveling on rough terrain, characterized in that an intake passage 13 connected to the air cleaner 14 is opened in a wall surface.