JPH0796396B2 - Cooling system for vehicle air-cooled engine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for an air-cooled engine of a vehicle, and more specifically, a duct for cooling engine cooling air introduced between an engine and a cooling cover. The present invention relates to a cooling device for an air-cooled engine of a vehicle, which is to be discharged to the outside via

b. Conventional Technology As one of the conventional air-cooled engine cooling devices for vehicles on rough terrain, etc., it is a part where the engine body needs to be cooled,
A vehicle in which the cylinder head and the surroundings of the cylinder are covered with a cooling cover, cooling air is introduced between the engine cylinder and the cooling cover, and the air after being cooled is exhausted to the outside through an exhaust duct. There is.

Such a vehicle includes a duct for introducing cooling air (hereinafter, this duct is referred to as an intake duct) and a duct for exhausting the air after being cooled to the atmosphere (hereinafter, this duct is referred to as an exhaust duct). Referred to as) respectively.

c. Problems to be Solved by the Invention By the way, in such a vehicle, a part of the vehicle is immersed in water for traveling (hereinafter, such traveling is referred to as underwater traveling for convenience of description. ). In such a case, if the atmosphere opening port of the exhaust duct is submerged and blocked, it becomes difficult to cool the engine body, and seizure or the like may occur, possibly damaging the engine body. It was For this reason, in the above vehicle, it is not possible to run underwater in a place where the atmosphere opening port of the exhaust duct is deep enough to be submerged in water.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cooling device for an air-cooled engine of a vehicle that can perform stable underwater traveling.

d. Means for Solving the Problems In the present invention, in order to achieve the above object, the engine cooling air introduced between the engine cylinder and the cooling cover is exhausted to the outside through the exhaust duct. In a cooling device for an air-cooled engine of a vehicle, one end of the exhaust duct is connected to an engine cooling air exhaust port formed in the cooling cover, and the middle of the exhaust duct is positioned higher than the engine cylinder. The atmosphere opening port at the other end of the exhaust duct is located lower than the top part in the middle of the exhaust duct apart from the engine, and the atmosphere opening port of the exhaust duct is located near the top part of the exhaust duct. A valve means is provided which opens only when it is submerged and blocked and short-circuits the air in the exhaust duct to let it escape to the atmosphere.

e. Example Hereinafter, an example of a cooling device for an air-cooled engine for a vehicle according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an all-terrain vehicle 1 to which an embodiment of the present invention is applied, and FIG. 2 shows a main part on a suction side of cooling air of a cooling device 2 which is an embodiment of the present invention. 3 to 5 show the air cleaner cap 3 in this embodiment, respectively, and FIG. 6 shows the main part on the exhaust side of the air used for cooling the engine of the cooling device 2. .

The cooling device 2 of the present embodiment has an intake duct 6 having an atmosphere opening port (hereinafter referred to as an intake port) 4 for sucking cooling air.
And an exhaust duct 7 for exhausting the air, which has been used for cooling the engine 5, to the outside through the atmosphere opening 27 (see FIG. 1).

In this cooling device 2, an engine cylinder, a cylinder head, etc., which is a part of the engine 5 that requires cooling, is covered with a cooling cover 40, and a cooling air is introduced between the engine cylinder, etc. and the cooling cover 40 through the intake duct 6. Have been introduced.

Near the top of the exhaust duct 7 near the top, an escape port 41 for releasing the air in the exhaust duct to the atmosphere is provided, and a valve means (air relief valve) 8 described later is provided in the escape port. There is.

In the present embodiment, the midway of the exhaust duct 7 is positioned higher than the engine cylinder, and the atmosphere opening port 27 at the other end of the exhaust duct 7 is separated from the engine 5 and is located above the midway top of the exhaust duct. It is positioned low and opened near the front wheel 28.

The suction port 4 of the suction duct 6 is integrally formed in the center of the upper portion of the air cleaner cap 3 of the air cleaner 9 so as to be opened forward (see FIGS. 2 to 5). The air cleaner 9 is arranged in the upper front part of the engine 5.

At the rear end of the air cleaner cap 3, there is formed an opening 10 for sending the cooling air taken in from the suction port 4 to the bellows-shaped tube 20.

Further, in the air cleaner cap 3, below the suction port 4, another suction port 11 for sucking air into the air cleaner 9 is integrally formed.

Furthermore, mounting support pieces 12 and 13 are projectingly provided at one front end and the other rear end of the air cleaner cap 3 (see FIG. 3).

The mounting support piece 12 has a notch 12a that opens downward, and the mounting support piece 13 has a notch 13a that opens rearward.

The air cleaner cap 3 is installed on the vehicle body side as described below.

First, after inserting the mounting support piece 12 of the air cleaner cap 3 into a bolt (not shown) penetrating a bracket (not shown) projecting downward from the vehicle body upper frame 14, for example, the mounting support piece is attached. It is lowered downward as a center, and the mounting support pieces 12 are fitted into, for example, bolts (not shown) penetrating the bracket 16 protruding rearward from the vehicle body central frame 15, and then the mounting support pieces 12, 13 are inserted. The air cleaner cap 3 is installed and fixed directly below the vehicle body cover on the vehicle body side by fixing the respective to the brackets.

Thereby, the suction port 4 and the air cleaner cap 3
Installation on the vehicle body side is completed in one step.

Air cleaner cap 3 installed and fixed in this way
An air cleaner case 18 having an element 17 therein is attached from below to the air cleaner case 18.

The installation of the air cleaner case 18 on the air cleaner cap 3 will be described later.

The cooling cover 40 has an introduction hole 19 for introducing cooling air into the cooling cover via the suction duct 6.

The suction duct 6 is a bellows-shaped tube 20 extending from the inlet 19 of the cooling cover 40, and a connection installed at the tip of the tube 20 and detachably connecting the duct to the opening 10 of the air cleaner cap 3. The part 21 and the suction port 4 of the air cleaner cap 3 are provided.

The exhaust duct 7 comprises a bellows-shaped tube 22 and a guide pipe 23.

One end of the bellows-shaped tube 22 is connected to a cooling air discharge port 24 formed in the cooling cover 40, and the other end is exposed inside one end of the guide pipe 23. The cooling air outlet 24 is opened to the side of the cooling cover 40.

The bellows-shaped tube 22 is connected and fixed by a connecting means (not shown) in the guide pipe 23 so as to have a gap 25 of a predetermined width which forms the escape port 41 around the guide pipe 23.

A valve body 26 made of a ring-shaped elastic member is installed at the tip of the bellows-shaped tube 22, and the valve body and the guide pipe 23 are provided.
The valve means 8 is constituted by the inner peripheral surface 23a of the.

The bellows-shaped tube 22 is preferably bent immediately and extends upward with respect to the engine 5, and is preferably connected to the guide pipe 23 near the upper portion of the vehicle body.

The guide pipe 23 is bent into a substantially L shape, and an atmosphere opening port 27 at its tip is exposed near the front wheel 28. The central portion of the guide pipe 23 is located higher than the air cleaner 9 and forms the top of the exhaust duct 7.

Further, the air cleaner case 18 has brackets (not shown) corresponding to the brackets 29, 29 protruding on both sides of the air cleaner cap 3, and the air cleaner case 18 is fixed to the air cleaner cap 3 by these brackets. This is done by fitting the brackets together and fixing them to each other with bolts (not shown).

As is clear from the above, the air cleaner case
18 can be easily fixed to the air cleaner case 18 while visually confirming the position of the element 17 in a sufficiently wide space below the air cleaner cap 3.

Further, in the air cleaner case 18, an annular bottom portion 31 around the element mounting portion 30 at the bottom thereof is inclined toward the drain port 32 formed in the rear portion.

As a result, even if the moisture of the air taken into the air cleaner 9 condenses, the condensed water generated thereby reaches the drain port 32 by being guided by the annular bottom portion 31 and is discharged to the outside of the air cleaner 9 via the drain port. To be done.

A drain tube 33 with a check valve function is fitted to the lower portion of the drain port 32 of the air cleaner case 18 to open by the weight of the condensed water when the condensed water has accumulated to some extent and discharge the condensed water.

The drain tube 33 can be molded of a soft resin material such as rubber, and the lowermost portion 33a thereof is normally configured to be closed by its elasticity.

Next, the operation of the cooling device 2 will be described.

When the rough terrain vehicle 1 travels normally, the cooling air taken from the intake port 4 of the air cleaner cap 3 is connected from the rear opening 10 of the air cleaner cap 3 to the connecting portion.
It is fed between the engine cylinder and the like and the cooling cover 40 through the 21 and the bellows-shaped tube 20 and used for cooling the engine cylinder, the cylinder head and the like.

Thereafter, the air that has been subjected to this cooling is discharged to the front wheel 28 side through the bellows-shaped tube 22 and the guide pipe 23. The vicinity of the front wheel 28 is a portion where the heat damage to the driver is relatively small.

Further, when the vehicle 1 running on uneven terrain travels underwater, if the atmosphere opening port 27 of the duct 7 is submerged and closed, the valve body 26 of the valve means 8 is pushed by the air pressure in the duct 7. Guide pipe
The air, which has been separated from the inner peripheral surface 23a of 23 and opened (state shown by the dotted line in FIG. 6), is used to cool the engine body. It is directly discharged to the outside via 8.

This ensures that the clogging of the cooling air in the cooling device 2 is prevented by the operation of the valve means 8.

On the other hand, the air taken into the air cleaner 9 through the suction port 11 flows to the carburetor (not shown) of the engine 5 from the lower opening 34 of the element 17 through the bellows-shaped duct 35.

f. Effects of the Invention As described above, according to the vehicle air-cooled engine cooling device of the present invention, when the atmosphere opening port of the exhaust duct is closed, the valve means is opened to close the exhaust duct. The air can be discharged directly to the outside from the middle of the process. Moreover, since the valve means is located near the top of the exhaust duct, even if the atmosphere opening port of the exhaust duct is submerged in water,
Since it is possible to prevent the valve means from being submerged in water as much as possible, it is possible to prevent air from clogging in the duct as much as possible, so that the vehicle can be stably run in water.

[Brief description of drawings]

1 to 5 show an embodiment of a cooling device for an air-cooled engine of a vehicle according to the present invention, and FIG. 1 conceptually shows an off-road vehicle to which the embodiment is applied, and FIG. Is an enlarged sectional view showing an essential part of a portion on the suction side of the cooling air, FIG. 3 is a plan view showing the air cleaner cap, FIG. 4 is a sectional view taken along line AA in FIG. FIG. 6 is a sectional view taken along the line BB in FIG. 3, and FIG. 6 is an enlarged sectional view showing an essential part of a portion on the air discharge side after the engine has been cooled. 1 ... Rough-terrain vehicle, 2 ... Cooling device, 3 ... Air cleaner cap, 4 ... Suction port, 5 ... Engine, 6 ... Suction duct, 7 ... Exhaust duct, 8 ... Valve means, 9 …… Air cleaner, 24 …… Engine cooling air exhaust port, 27 …… Air release port, 40 …… Cooling cover.

Claims (1)

[Claims] 1. A cooling device for an air-cooled engine of a vehicle, wherein engine cooling air introduced between an engine cylinder and a cooling cover 40 is exhausted to the outside through an exhaust duct 7. One end is connected to the engine cooling air discharge port 24 formed in the cooling cover 40, the midway of the exhaust duct 7 is positioned higher than the engine cylinder, and the other end of the exhaust duct 7 is open to the atmosphere. 27
Is located lower than the top of the exhaust duct 7 apart from the engine, and the atmosphere opening 27 of the exhaust duct 7 is closed by being submerged in the vicinity of the top of the exhaust duct 7. A cooling device for an air-cooled engine of a vehicle, which is provided with a valve means 8 which opens only when the air is exhausted and short-circuits the air in the exhaust duct 7 to release the air to the atmosphere.