JPH03239632A - Engine-room ventilating device for longitudinal shaft engine with forced air cooling type liquid cooling radiator - Google Patents

Abstract

PURPOSE:To carry out ventilation and cooling of the upper space in the inside of an engine room by providing a radiator so as to be inclined obliquely upward toward the downstream side of exhausted cooling air, and by opening the exhaust air port on the upper part of the hood wall of a hood which is positioned obliquely upward on the downstream side of exhausted cooling air viewing from the radiator. CONSTITUTION:The cooling air discharged from a cooling fan 5 is guided by a fan case 6 and is sent to the cooling air passage 18 of a cylinder 2 and a cylinder head 3 and to the side of a radiator 9. Out of this cooling air, the cooling air sent to the radiator 9 side passes through the radiator 9, and flows obliquely upward as exhausted cooling air, and then flows out into the outside through the exhaust air port 12 on the upper part 4a of a hood wall. At that time, induced by the flow of the exhausted cooling air, the air in the upper space 7a inside an engine room 7 simultaneously flows out into the outside through the exhaust air port 12, so that the upper space 7a inside the engine room 7 is forcibly ventilated and cooled. Thus, overheating of the engine is hardly caused, and since the density of the intake air becomes high, the output of the engine can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an engine room ventilation system for a forced air vertical shaft engine equipped with a liquid-cooled radiator.

<Prior Art> As a basic structure of the present invention, for example, as shown in FIGS. 1, 2, and 4, a forced air vertical wheel engine is installed in an engine room 7 covered with a bonnet 4. However, the forced air type vertical shaft engine is constructed as follows: a centrifugal cooling fan 5 and a fan case 6 are provided on the upper side of the vertical shaft engine main body 1; A radiator 9 of the liquid cooling device is provided on one side in the circumferential direction of the
A radiator 9 is connected in a circular manner to a liquid cooling chamber 8 formed in at least a part of the cylinder 2 and the cylinder radiator 3, and an air intake port 10 is provided on the upper surface of the fan case 6. The present invention relates to a ventilation system in which an air outlet 11 is provided facing a radiator 9.

Conventionally, in the above-mentioned ventilation system, as shown in FIG. 4, a radiator 9 is provided in an upright position on the leeward side of the cooling exhaust air, and a bonnet 4 located on one or both of the left and right sides of the radiator 9 is installed. An air exhaust port 22 was opened in the side wall 4b (see the imaginary diagram in FIG. 1).

<Problem that the invention seeks to solve> However, the above structure has the following problems.

(1) Of the cooling exhaust air that has passed through the radiator 9, the cooling exhaust air that has flowed toward the upper space 7a in the engine room has a large exhaust resistance immediately after passing through the radiator 9, so The air remains in the upper space 7a in the engine room and does not flow out through the exhaust port 22 formed in the hood side wall 4b, so that ventilation and cooling in the upper space 7a in the engine room are weak. Therefore, hot air from heat generating parts such as the muffler 21 and the cylinder head 3 also tends to accumulate in the upper space 7a in the engine room.

Therefore, the engine becomes hot due to the heat trapped in the upper space 7a, making it easy to overheat, and the intake air is also heated and becomes less dense, resulting in a decrease in engine output.

(2) Moreover, when heat accumulates in the upper space 7a in the engine room, the required heat resistance of each component disposed in this upper space 7a increases, increasing the cost of each component.

(3) Also, in order to prevent heat from accumulating in the upper air f=Ma in the engine room, it is possible to open the exhaust port 22 in the upper part 4a of the bonnet wall. Rainfall and rainwater enters the engine, causing rust to occur in various parts of the engine.

The present invention aims to solve the above problems.

<Means for Solving the Problems> In order to solve the above problems, the present invention is constructed, for example, as shown in FIGS. 1 and 2.

That is, in the first invention of the present application, the radiator 9 is provided in an inclined shape that faces diagonally upward toward the leeward side of the cooling exhaust air, and is located diagonally upward on the leeward side of the cooling exhaust air when viewed from the radiator 9. An air exhaust port 12 is opened in the upper part 4a of the bonnet wall of the bonnet 4.

Further, in a second aspect of the invention, the exhaust port 12 is connected to the upper part 4 of the bonnet wall.
It opens laterally outward at a.

<Effect> Next, the effect will be explained.

The cooling exhaust air that has passed through the radiator 9 flows obliquely upward and flows out through an exhaust port 12 formed in the upper part 4a of the bonnet wall.

At this time, since the flow of the cooling exhaust air is generated near the upper space 7a in the engine room, the air in the upper space 7a in the engine room is sucked toward the exhaust port 12 side by the flow, and from the exhaust port 12. leak.

Therefore, the upper space 7a in the engine room is strongly ventilated and cooled.

In addition, when the air outlet 12 opens laterally outward in the upper part 4a of the bonnet wall, it is difficult for rain to enter through the air outlet 12, and even if rainwater tries to enter from the air outlet 12 through the bonnet 4, it will not be able to penetrate through the air outlet. Since the cooling exhaust air flows outward from 12, rainwater is blown away by the force of the cooling exhaust air and does not enter the engine room 7.

<Effects of the Invention> Since the first invention of the present application is configured as described above, it has the following effects.

(A) Air in the upper space of the engine room is sucked into the exhaust port by the flow of cooling exhaust air that has passed through the radiator, and is then discharged to the outside from the exhaust port, allowing ventilation and cooling of the upper space in the engine room. is carried out strongly.

As a result, the engine is less likely to overheat, and the density of the intake air is increased, increasing engine output.

(B) Moreover, since the upper space in the engine room is strongly ventilated and cooled, the required heat resistance of each component placed in this upper space can be lowered, and the cost of each component can be reduced.

(C) The structure for obtaining the above effects (A) and (B) simply utilizes the flow of cooling exhaust air from the radiator, so there is no need to separately add a ventilation device, and the structure can be implemented with a simple structure.

Further, the second invention provides the following effects in addition to the effects (A), (B), and (C) above.

(D) Rainwater does not enter the engine room through the exhaust port,
Prevents rust on various parts of the engine.

<Example> An example of the present invention will be described based on FIGS. 1 to 3.

The engine E is a forced-air vertical shaft engine that uses both cooling air and cooling fluid, and is installed, for example, in the engine room 7 in front of the bonnet/throat 4 of the lawn mower S shown in FIG. will be established.

A centrifugal cooling fan 5 and a fan case 6 are attached to the upper side of the vertical axis engine body 1.
An air intake port 10 is opened on the upper surface thereof, and an air blowing port 11 is opened on one side surface in the circumferential direction.

Further, a partition plate 20 is fixed to the fan case 6, and the upper space 7a of the engine room 7 is divided into front and rear parts by this partition plate 20.

A liquid cooling chamber 8 and an air cooling passage 18 are formed inside the cylinder head 3, and the liquid cooling chamber 8 communicates with a radiator 9 via a communication device 13 such as a hose. Cooling fluid circulates between the 9 parts.

As shown in FIG. 3, the heat radiator 9 is attached to the cylinder above the throat 3 in an inclined manner so as to be diagonally upward toward the leeward side of the cooling exhaust air.

That is, a support plate 17 is fixed with bolts 16 to the inclined surface of a bracket 15 fixed to the cylinder head 3 with bolts 14, and a liquid-cooled heat radiator 9 is welded and fixed to this support plate 17.

In this embodiment, the liquid cooling device includes a radiator 9, a liquid cooling chamber 8, a communication device 13, bolts 14 and 16, a bracket throat 15, and a support plate 1.
It consists of 7 mag.

The bonnet 4 has an air exhaust port 12 located obliquely upward on the leeward side of the cooling exhaust air when viewed from the radiator 9.
The upper part 4a of the bonnet wall is opened laterally outward.

In the figure, 19 is a helmet cover, and 21 is a muffler.

With the above configuration, the cooling air generated by the cooling fan 5 is guided by the fan case 6 and blown toward the air cooling passage 18 of the cylinder 2 and cylinder head 3 and the radiator 9 side.

Of the cooling air, the cooling air blown toward the radiator 9 passes through the radiator O, flows obliquely upward as cooling exhaust air, and flows out from the exhaust port 12 in the upper part 4a of the bonnet wall. .

At this time, the air in the upper space 7a in the engine room is simultaneously drawn out by the flow of the cooling exhaust air and flows out from the exhaust port 12, and the upper space 7a in the engine room is strongly ventilated and cooled. Ru.

Moreover, the air surrounding the muffler 21 and the like is also attracted by the flow of the cooling exhaust air and flows out from the exhaust port 12, thereby cooling the muffler 21 and the like.

Note that the liquid cooling chamber 8 may be provided in both the cylinder 2 and the cylinder throat 3, or may be provided only in either one.

[Brief explanation of drawings]

Figures 1 to 3 show embodiments of the present invention, with Figure 1 being a perspective view of a lawn mower, Figure 2 being a side view of the main parts of the lawn mower, and Figure 3 showing the main parts of the engine. It is a vertical side view, and FIGS. 4 and 4 are views corresponding to FIG. 2 showing a conventional example. 1...Engine body, 2...Cylinder, 3...Cylinder head, 4...Bonne throat, 5...Cooling fan, 6...
Fan case, 7...Engine room, 8...
...Liquid cooling chamber, 9...Radiator, 10...
...Intake port, 11...Exhaust port. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. Engine room (7) covered with bonnet (4)
A forced air vertical shaft engine is installed inside the engine, and the forced air vertical shaft engine is configured as follows: A centrifugal cooling fan (5) and a fan case (6) are installed on the upper side of the vertical shaft engine body (1). ), and a radiator (9) of the liquid cooling device is provided on one side in the circumferential direction of the fan case (6) above the vertical axis engine body (1), and the radiator (9) is connected to the cylinder (2) and A liquid cooling chamber (8) formed in at least a part of the cylinder head (3) is connected in a circular manner, and an air intake port (10) is provided on the upper surface of the fan case (6). In an engine room ventilation system for a vertical engine with a forced-air liquid-cooled radiator, which has an air outlet (11) facing the radiator (9) on one side, the radiator (9) is used to connect the radiator (9) to the cooling exhaust air. The upper part of the bonnet wall (4 a
) An engine room ventilation system for a vertical shaft engine equipped with a forced air liquid-cooled radiator, characterized by having an air exhaust port (12) opened at the top. 2. An engine room ventilation system for a vertical shaft engine with a forced-air liquid-cooled radiator, characterized in that the air exhaust port (12) is opened horizontally and outwardly in the upper part (4a) of the bonnet wall.