JPH029064Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooling system structure for a horizontal engine.

A conventional cooling system for a horizontal engine has a structure as shown in FIG. That is, the output radiator hose 1 that sends engine cooling water heated by the engine to the radiator runs from the upper end of the engine 2 on the opposite side to the transmission side of the engine. It was disposed around the opposite side and over the upper end of the radiator 3 on the side opposite to the transmission disposed side.
In addition, a lower radiator hose 4 that sends the cooling water cooled by the radiator 3 to the engine 2 is connected from the lower end of the radiator 3 on the side opposite to the transmission side to the side opposite to the transmission side of the engine. It was placed around the lower end of the engine 2 on the side opposite to the transmission side. The thermostat 5, which bypasses a portion of the cooling water, is installed on the side of the output radiator hose 1, and is placed at a relatively high position to avoid interference with various parts and piping installed on the opposite side of the transmission 6. It was set up.

However, in the conventional device having the above structure, the lower radiator hose 4 is disposed below the upstream radiator hose 1 and close to the upstream radiator hose 1. There was a problem in that the cooling efficiency of the radiator 3 was lowered due to the influence of heat from the radiator 1. In this case, lower radiator hose 4
Even if you try to install it from the lower end of the radiator 3 on the side opposite to the transmission installation side, through the transmission installation side of the engine, and over the water pump of the engine 2, the lower radiator hose 4 and engine mount 7 Because it interferes with
Arranging such hoses was difficult.

Furthermore, in the conventional cooling system structure, the thermostat 5 is mounted at a relatively high position and closed as described above, so even if water is injected into the cooling system from the water inlet 8 provided at the upper center of the radiator 3, It is difficult to remove air from the thermo housing, and there is a problem in how to reduce the amount of air trapped between the water inlet 8 and the thermostat 5.

In order to solve the above problems of the conventional engine cooling system structure, this invention increases the distance between the upper radiator hose and the lower radiator hose to eliminate thermal interference between them, and also bleeds air from the thermo housing and its vicinity. The purpose is to lower the installation position of the thermo housing to make it easier.

To achieve this objective, in the engine cooling system structure of the present invention, the thermostat is placed on the transmission where there is less interference with other equipment, and the attenuation radiator hose is connected to the engine's transmis- sion as usual. The lower radiator hose is disposed at the end opposite to the transmission side and runs from the water outlet to the top of the radiator end opposite to the transmission side. It is arranged from the lower end of the arrangement side to the thermostat provided on the transmission. The thermostat is also connected to the water pump via a water inlet pipe and to the water outlet via a water bypass pipe.

By adopting such a configuration, the distance between the upper radiator hose and the lower radiator hose is increased, thermal interference between the two is eliminated, and the cooling efficiency of the radiator is increased. In addition, the thermostat is positioned lower than before, and the drop from the radiator water inlet is increased, so when cooling water is injected into the thermostat, the cooling water circulates, naturally solving the problem of air bleeding. .

Preferred embodiments of the engine cooling system structure of the present invention will be described below with reference to the drawings.

FIGS. 2 and 3 show the arrangement of each component of an engine cooling system structure according to an embodiment of the present invention.
In the figure, 11 is an engine mounted horizontally on the vehicle. 12 is a transmission connected to the engine 11, and 13 is a radiator disposed on the front side of the vehicle with respect to the engine 11. The cooling water, which has cooled the engine 11 and has been raised in temperature, is passed from the water outlet 14 provided at the upper end of the engine 11 on the side opposite to the radiator, that is, at the cylinder head, to the atrium radiator hose 15. It is sent to the radiator 13 via the radiator 13. The output radiator hose 15 passes around the side of the engine 11 opposite to the transmission side and is led to the upper part of the radiator 13 on the side opposite to the transmission side.

On the other hand, the cooling water cooled by the radiator 13 is
It is led to a thermostat 17 via a lower radiator hose 16. The thermostat 17 is arranged on the transmission 12, and the lower radiator hose 16 is arranged from the end of the radiator 13 on the transmission side to the thermostat 17 on the transmission 12. . In this case, by taking out the lower radiator hose 16 from the transmission installation side of the radiator 13, the lower radiator hose 16
No interference occurs between the engine mount 22 and the engine mount 22.

Further, the thermostat 17 is connected to a water pump 19 via a water inlet pipe 18 disposed on the opposite side of the engine 11 from the radiator 13. A water pump 19 is located below the water outlet 14 and pumps cooling water to the cylinder block of the engine. The thermostat 17 is also connected to the water outlet 14 via a water bypass pipe 20, allowing a portion of the cooling water directed from the engine 11 to the radiator 13 to flow from the radiator 13 to the engine 11 without passing through the radiator 13. Bypass the cooling system towards the destination.

Thermostat 17 is located lower than water outlet 14 and higher than water pump 19. Further, a water inlet 21 for injecting water into the cooling system is provided at the upper center of the radiator 13, that is, at the center of the hot tank of the radiator 13. The thermostat 17 is located at a lower level than the water inlet 21. Such a positional relationship in height can be easily obtained in practice by arranging the thermostat 17 on the transmission 12.

Next, the operation of the embodiment apparatus having the above-described configuration will be explained.

First, the distance between the upper radiator hose 15 and the lower radiator hose 16 is greater than in the past. That is, conventionally lower radiator hose 1
However, in the present invention, in the radiator 13 section, the lower radiator hose 16 is separated from the output radiator hose 15 in both the vertical and lateral directions, and is connected to the transmission of the engine 11. Extends to the installation side. Therefore, the lower radiator hose 16 is hardly affected by the heat from the high-temperature upper radiator hose 15, and the lower radiator hose 16
3. Cooling efficiency increases. This effect is obtained by disposing the thermostat 17 on the transmission side of the engine 11.

Further, by disposing the thermostat 17 on the transmission 12, the relative position of the thermostat 17 with respect to other equipment can be lowered. In other words, the thermostat 17 is connected to the water inlet 2.
1 and the water outlet 14. Therefore, when the cooling system is made to have a low pressure using the water inlet 21 and water is injected into the cooling system from the water inlet 21, the water falls to the lower part of the radiator 13 and flows from the lower part of the radiator 13 through the lower radiator hose 16 to the thermostat. 17, the air inside the thermo housing is pushed away, and the air that tends to move upward due to buoyancy is pushed through the water bypass pipe 20 to the water outlet 14. The air in the water outlet 14 escapes to the radiator 13 along with the air from the engine 11 through the upstream radiator hose 15.
In this way, even in the thermostat 17, which has conventionally been prone to air accumulation and difficult to bleed out, the air accumulation can be completely and easily removed.

As explained above, when using the engine cooling system structure of the present invention, by arranging the thermostat above the transmission, the distance of the lower radiator hose from the upper radiator hose is increased, thereby increasing the cooling efficiency of the radiator. By lowering the thermostat position, the air inside the thermo housing can be easily removed.
The effect of eliminating the occurrence of cavitation, etc. can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of the cooling system structure of a conventional horizontal engine, FIG. 2 is a schematic plan view of the cooling system structure of a horizontal engine according to an embodiment of the present invention, and FIG. 3 is the same as that of FIG. FIG. 2 is a schematic front view of the device. 11...Engine, 12...Transmission, 13...Radiator, 14...Water outlet, 15...Air pressure radiator hose, 1
6...Lower radiator hose, 17...Thermostat, 18...Water inlet pipe, 1
9...Water pump, 20...Water bypass pipe, 21...Water inlet, 22...Engine mount.

Claims (1)

[Scope of utility model registration request] In the cooling system structure of a horizontally mounted engine, the thermostat for cooling water bypass is placed above the transmission, and the intake air radiator hose that leads the cooling water from the engine to the radiator is placed on the opposite side of the engine from the side where the transmission is installed. A lower radiator hose is installed from the water outlet provided at the end of the radiator to the upper end of the radiator on the side opposite to the transmission side, and leads the cooling water from the radiator to the thermostat on the transmission. The thermostat is disposed from the lower end of the radiator on the transmission side to the thermostat disposed on the transmission, and the thermostat is connected to the water pump via the water inlet pipe, and the water bypass pipe is connected to the thermostat. An engine cooling system structure, characterized in that the engine cooling system is connected to the water outlet through the water outlet.