JPS61171610A - Engine cooling device for horse-back riding type vehicle - Google Patents

Abstract

PURPOSE:To enable a cooling efficiency to be improved by arranging a suction port which is to be located at an air shroud, on the upper section of a fender outside a tire house in a automatic motortricycle and the like equipped with balloon type tires. CONSTITUTION:The opening of a suction port 22 is arranged at a place which is higher than that of a tire house 37 facing afterward starting from the front section of a front fender 4. And a suction pipe 21 is formed as an integral part of the fender 4 allowing the pipe 21 to be connected with No.1 shroud cover 16 which comprises an air shroud 14 through a suction duct 20. This allows the outside air to be admitted into the air shroud 14 by the rotation of a fan 23 through the suction port 22, the suction pipe 21, the duct 20, and No.1 air shroud 16. This permits the admitted air to cool forcibly cylinder heads 12 and 13, and an exhaust pipe 35 allowing it to be discharged from an exhaust pipe (not shown). This configuration enables the admitted outside air to flow smoothly allowing a cooling efficiency to be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a riding type vehicle such as a tricycle or a four-wheeled motor vehicle equipped with balloon tires on the front and rear wheels, and particularly to a cooling device for the engine thereof.

[Prior art]

This type of vehicle has the stability of a three- or four-wheeled vehicle and low-pressure wide balloon tires.

Since it can be run easily on rough terrain and wetlands, it has recently been used for practical purposes such as guiding heavy and large agricultural machinery, rather than for racing and resoying.

By the way, conventionally, this type of vehicle has been equipped with an air-cooled engine similar to a motorcycle, and due to the layout of the vehicle body, this air-cooled engine is installed between the front wheels and the rear wheels and below the seat. There is.

[Problem that the invention seeks to solve]

However, when used for agricultural purposes as mentioned above, in addition to the high load operation despite the low running speed, the balloon tires in front of the engine cause
Since the flow of cooling air to the engine is likely to be obstructed, the amount of cooling air tends to be insufficient while the vehicle is running. Therefore, if high load operation continues for a long period of time, there is a risk that the engine will overheat.

Furthermore, since the running speed is low, the hot air from the engine rises while the vehicle is in operation, exposing the driver to the hot air, resulting in increased discomfort.

For these reasons, the applicant has recently developed a forced air-cooled engine engine, which uses the engine itself to turn a fan to suck in outside air, and then forcefully blows this outside air into a cylinder covered with an air shroud. We have already completed the application.

In this case, the air intake port is communicated with the air shroud, but as mentioned above, this type of tricycle or four-wheeled vehicle has a special use and purpose, so the installation position of the intake port may vary. There is a risk that foreign objects such as plants, dirt, or water that are thrown up by the front or rear wheels may enter the intake port while the vehicle is running.

If this foreign matter is guided into the air shroud, it will accelerate wear and rust on various parts, and if this foreign matter accumulates inside the air shroud, the flow of cooling air will be interrupted. This causes problems such as a decrease in cooling performance.

[Means for solving problems]

Therefore, in the present invention, when providing an outside air inlet in the air shroud that covers the cylinder 9, this inlet is located outside the tire house in which the front wheel or the rear wheel is accommodated,
It is also characterized by being provided at the top of the fender.

[Effect]
B According to such a configuration, the front wheels and rear wheels are exposed to vegetation, trees, etc. while driving.
Even if foreign matter such as earth and sand is blown up, this foreign matter is blocked by the fender, so the intake port is less likely to suck in foreign matter, and the circulation of outside air as cooling air is not obstructed. Furthermore, since the opening position of the intake port is necessarily high, there is no risk of inhaling water even when driving through a swamp or the like with a certain depth of water.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In the figure, reference numeral 1 denotes a frame constituting the vehicle body, and a pair of left and right front wheels 3.3, which are steered by a par handle 2, are supported at the front of the frame 1. The area from above the front wheels 3, 3 to the rear K is dominated by synthetic resin 70-ton fenders 4, 4. These front fenders 4, 4 are integrated on the left and right sides, and are fixed to the frame 1. . At the rear of the frame 1 is a pair of left and right rear wheels 5.
．． 5 is supported, and the front and upper parts of these rear wheels 5.5 are covered by left and right rear fenders 8, 8 made of synthetic resin and integrally formed on the left and right sides. Therefore, front wheel 3
, 3 and the rear wheels 5, 5 are respectively connected to the front fender 4°4.
, is housed in a tire house 37 formed inside the rear fenders 8,8. On the rear fenders 8, 8,
A seat 6 for the driver A to sit on is installed, and a cover 7a is provided between the seat 6 and the front par handle 2.
A fuel tank 1 covered by is installed.

Furthermore, the air pressure of the front wheels 3.3 and rear wheels 5, 5 is 0.
．． It is equipped with wide balloon tires 9 that have a low pressure of 1 to 0.2 kp/cm.

Note that reference numeral 19 in the figure indicates left and right footrests as footrests for the driver A.

By the way, the frame I has front wheels 3, 3 and rear wheels 5, 5.
An air-cooled engine 10 is mounted between the seats 6 and below the front end of the seat 6. This engine 10 includes an upright cylinder 12 on a crankcase 1, and a large number of cooling fins 12m and 13g are protruded from the cylinder 12 and cylinder head 13.
Its outer periphery is covered by a construction shroud 14 as shown in FIG. The air shroud 14 includes a shroud P main body 15 that continuously covers the front, upper and rear surfaces of the cylinder J2 and the cylinder head 13, a first shroud cover 16 that covers the left opening of the shroud main body 5, and It has a three-part structure with a second shroud cover 17 that covers the right opening of No. 5,
The above crankcase 11 and crankcase cover 1
At 8? The bolts are tightened. An opening 16 formed at the upper end of the first shroud cover 16 is connected to a suction passage 21 provided on the upper surface of the left front fender 4 via a suction duct 20 extending forward.

As shown in FIG. 1, the intake passage 2 is formed integrally with the front fender 4 and extends in the longitudinal direction of the vehicle body, and its front end is located behind the front end of the front fender 4. An intake port 22 that opens toward the front is formed at the front end of this intake passage 21. It is located on the upper outer side of the sandwich.

In addition, in the case of this embodiment, the suction port 2 in the suction passage 21
Immediately after the filter 2, a filter 38 is provided to prevent foreign matter from entering. The filter 38 is made of, for example, a flat wire mesh, and as shown in FIG. 6, it is inclined at a predetermined angle so that as it goes toward its lower end, it is positioned toward the rear, which is the direction in which outside air is taken in. Therefore, the foreign matter captured on the front surface of the filter 38 falls naturally as the filter 38 is tilted, as shown by the broken arrow, and the filter 38 is prevented from clogging. Additionally, a recess 39 is formed on the lower surface of the suction passage 21 corresponding to the installation position of the filter 38. Inside this recess 39,
Foreign matter that has fallen from the filter 38 may enter the filter.1. T, □ Engineering 9. ! 1□ Measures are taken to prevent the passage area of the suction passage 21 from being reduced.

A fan 23 is disposed within the upper Ayu air shroud 14 to the left of the cylinder J2 and the cylinder head 13 to suck in outside air.

A rotating shaft 24 of the fan 23 is supported via a bearing 26 on a support portion 25 extending from the upper surface of the crankcase cover 18, and a secondary sheep 22 is fixed to one end of the rotating shaft 24. Further, one end of the crankshaft 28 housed in the crankcase 11 passes through the crankcase cover 18, and the primary sheep 2 is fixed to this penetrating end.
9 and the above-mentioned secondary sheep 27 is a V-belt 30.
is wound. Therefore, the fan 23 is rotated together with the crankshaft 28, and this rotation causes the above-mentioned suction port 2
The outside air sucked in from 2 is sent to air shroud 14 and cylinder 1.
2 and the cylinder head 13.

On the other hand, an opening 17 & opening at the upper side of the second shroud cover 17 is connected to an exhaust passage 33 which is integrally formed on the right side fender 8 via an exhaust duct 32 extending rearward. The discharge port 34 at the tip of the discharge passage 33 is opened toward the side of the vehicle body.

In addition, the air cylinder 14 also integrally covers the exhaust pipe 35 of the engine 10, and after the exhaust pipe 35 is led out from the cylinder head 13, it is led to the opposite side from the 7a 723. It is routed rearward through the second shroud cover 17 and connected to a muffler 36 located between the rear wheels 5.5 and below the rear fender 8. (t) In the case of this embodiment, the exhaust pipe 35 is also forcedly air cooled together with the cylinder 12 and cylinder head 13.

According to such an embodiment of the present invention, the crankshaft 28
When the 7-ring 23 is rotated in conjunction with this, the outside air taken in from the suction port 22 is forcibly blown into the air shroud 14. In the process of this outside air flowing inside the air shroud 14, the cylinder 12. The cylinder head 13 and the exhaust pipe 35 are forcibly cooled, and the outside air whose temperature has been raised by this cooling is exhausted to the outside through the exhaust port 34 of the exhaust duct 32 and the exhaust passage 33 .

Therefore, even when operating at low speed and under high load, a sufficient amount of cooling air is guided to the cylinder j5, which is the heat generating portion of the engine 10, and overheating can be prevented.

By the way, in the above configuration, since the outside air intake port 22 is provided on the front 2 ender 4, which is the outside of the tire house 37 of the front wheel 3, even if the front wheel 3 kicks up foreign matter such as plants, dirt, etc. while driving, , this foreign object is blocked by the front fender 4.

Therefore, it becomes difficult for the suction port 22 to suck in the foreign matter that has been blown up, so it is possible to prevent foreign matter from entering the suction passage 21 and the suction port 22, which not only prevents damage to the 7-piece 23 but also prevents the circulation of outside air as cooling air. Unhindered. Moreover, since the front fenders 4, 4 are originally provided at a higher position than the front wheels 3, 3, the opening position of the intake port 22 is also raised higher relative to the ground. For this reason, the front wheels 31, 3
Even when the vehicle runs with the rear wheels 5, 5 submerged in water to a certain depth, the intake port 22 does not become submerged in water, and there is an advantage that water intake can be prevented.

In the above-described embodiment, the intake port was provided directly above the tire house, but it may also be provided in the center of the left and right front fenders 4°4, for example, as shown by the imaginary line in FIG. Alternatively, it may be provided not only on the front fender but also on the rear fender, and the opening direction thereof is not limited to the front, but may be in any direction, rear or upper.

Further, the intake port is not limited to being integrally molded into the fender, and the riding type vehicle according to the present invention is not limited to a four-wheeled motor vehicle; for example, it may be a three-wheeled motor vehicle with one front wheel or one rear wheel. It is possible to implement

[Effects of the invention] 1
According to the present invention described in detail above, since it is possible to prevent foreign matter from entering the air shroud during driving, the circulation of outside air as cooling air is not obstructed, and it is possible to maintain good engine cooling performance. can. In addition, since the opening position of the intake port is raised high relative to the ground, there are advantages such as the intake port will not be submerged or there is no risk of inhaling water even if the vehicle is driven through a swamp etc. with some depth of water. be.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIGS. 1 and 2 are side views of the four-wheeled motor vehicle, FIG. 3 is a plan view of the four-wheeled motor vehicle, and FIG. 4 is a front view of the four-wheeled motor vehicle. , FIG. 5 is a sectional view of the engine and its surroundings, and FIG. 6 is a sectional view of the intake passage. 3...1 wheel, 4 m 11...fender (front fender, rear fender), 5...-rear wheel, 6...
Seat, 9...Balloon tires, 10...Air-cooled engine. 12... Cylinder, 13... Cylinder head, 14
...Air shroud, 22...Intake port, 23...
Fan, 34...Exhaust port, 37...Tire house.

Claims (1)

[Claims] Equipped with low-pressure wide balloon tires on the front and rear wheels,
In a riding type vehicle that covers the upper part of the front wheels and the rear wheels with a fender, and has an air-cooled engine mounted between the front wheels and the rear wheels and below the seat that the driver straddles, the cylinder of the air-cooled engine and the cylinder The outer circumference of the head is covered with an air shroud, and this air shroud is
A fan is provided to connect an outside air intake port and an exhaust port, and forcibly blow the outside air taken in from the intake port toward the cylinder and the cylinder head, and the intake port is connected to the front wheel formed inside the fender. Alternatively, an engine cooling device for a riding type vehicle, characterized in that it is provided outside a tire house in which a rear wheel is housed and at the top of a fender.