JPH0244016Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to the structure of an engine cooling system, and is particularly applicable to horizontal engines (in which the longitudinal direction of the engine extends in the left-right direction of the vehicle), which facilitates air bleeding during water injection. (engine) cooling system structure.

[Conventional technology]

A conventional cooling system for a horizontal engine has a structure as shown in FIG. That is, the output radiator hose 1 that sends the engine cooling water heated by the engine 2 to the radiator 3 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 guides 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 has a relatively high It was set in position. In addition, 7
indicates the engine mount.

[The problem that the idea aims to solve]

However, in the conventional structure as described above, the thermostat 5 is mounted at a high position and closed, so even if water is injected into the cooling system from the water inlet 8 provided at the upper center of the radiator 3, the temperature of the thermo housing is Since it is difficult to remove the air and it is undesirable to leave it as it is from a cavitation standpoint, the problem was how to reduce the amount of air trapped between the water inlet 8 and the thermostat 5.

The purpose of the present invention is to facilitate air removal from the cooling system of a horizontally mounted engine, and in particular, to provide a cooling system structure that facilitates air removal from the thermohousing, which conventionally tends to cause air pockets.

[Means to solve the problem]

In order to achieve this objective, in the engine cooling system structure of the horizontal engine of the present invention, the height relationship between the water outlet, the thermo housing, and the water pump is such that the water outlet,
The thermo housing is lowered in order, followed by the water pump. Preferably, the water bypass passage connecting the water outlet and the thermo housing is gradually lowered from the water outlet to the thermo housing, and the water inlet passage connecting the thermo housing and the water pump is connected from the thermo housing to the water pump. It is gradually lowered.

[Effect]

By adopting such a configuration, when water is poured,
The air in the water inlet passage, thermo housing, and water bypass passage tends to move upward due to buoyancy, so it smoothly moves upward through the water inlet passage, thermohousing, and water bypass passage in order, and reaches the water outlet. Furthermore, the air is drawn out through the water inlet of the radiator via the radiator hose, thereby preventing air pockets from forming in the cooling system and thermo housing.

〔Example〕

Hereinafter, preferred embodiments of the engine cooling system structure of the present invention will be described with reference to the drawings.

2 to 4 show the structure of an engine cooling system according to an embodiment of the present invention. In the figure, 11 is an engine mounted horizontally on the vehicle. 1
2 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, flows from a water outlet 14 provided at the upper part of the end of the engine 11 opposite to the radiator side to the radiator 13 via a hot air radiator hose 15. sent to. The engine 1 radiator hose 15
It passes around the side opposite to the side where the transmission is installed and is led to the upper part of the radiator 13 on the side opposite to the side where the transmission is installed.

On the other hand, the cooling water cooled by the radiator 13 is
It is led to the thermo housing 17 via the lower radiator hose 16. The thermo housing 17 is disposed on the transmission 12 unlike in the past, and the lower radiator hose 16 runs from the end of the radiator 13 on the transmission side to the thermo housing 17 on the transmission 12.
It is placed on top.

Further, the thermo housing 17 is connected to a water pump 19 via a water inlet passage 18 disposed on the opposite side of the radiator 13 of the engine 11. A water pump 19 is located below the water outlet 14 and pumps cooling water to the engine cylinder block. The thermo housing 17 also has a water bypass passage 2
0 to the water outlet 14, and a part of the cooling water directed from the engine 11 to the radiator 13 is routed through the radiator 13 without passing through it.
The cooling system from the radiator 13 to the engine 11 is bypassed.

The water bypass passage 20 includes a water bypass pipe 20a extending from the water outlet 14 toward the thermo housing 17, and a water bypass hose 2 connected to the water bypass pipe 20a and extending to the thermo housing 17.
0b. The water inlet passage 18 also includes a water inlet pipe 18a extending from the water pump 19 toward the thermo housing 17, and a water inlet hose 18b connected to the water inlet pipe 18a and extending toward the thermo housing 17. .

The water outlet 14 is located higher than the thermo housing 17, the thermo housing 17 is located higher than the water pump 19, and the water outlet 14, thermo housing 17, and water pump 19 are lowered in this order. It is a positional relationship. The water bypass passage 20 slopes down gently from the water outlet 14 to the thermo housing 17, and is particularly inclined at the water bypass hose 20b. In addition, the water inlet passage 18
is from thermo housing 17 to water pump 19
The water inlet hose 18b and the water inlet pipe 18a are sloped at two locations near the water pump 19.

FIG. 5 shows the internal structure of the thermo housing 17. As shown in the figure, the center 24 of the opening 23 of the water bypass passage 20 to the thermo housing 17 is higher than the center 25 of the thermo housing 17, and the thermo housing 1
The center 25 of 7 is higher than the center 27 of the opening 26 of the water inlet passage 18 into the thermo housing 17.

A water inlet 21 used for injecting water into the cooling system and evacuation is provided at the center of the upper part of the radiator 13, and is provided at the center of the radiator upper tank. Note that 22 is the engine mount,
The positional relationship with the cooling system is such that they do not interfere with each other.

FIG. 6 is a diagram showing the order of water supply in the cooling system during engine operation. In the figure, 28 indicates a heater and 29 indicates a carburetor. As shown in the figure, the engine cooling water flows from the water outlet 14 to the radiator 13 via the hot air radiator hose 15, and a portion of the engine coolant flows from the water outlet 14 to the radiator 13.
3 and is led to the thermo housing 17 via the water bypass passage 20. Cooling water from the thermo housing 17 passes through a water inlet passage 18 to a water pump 19 and is fed into the engine 11. Cooling water from the engine 11 flows to the carburetor 29 and heater 28,
Cooling water passing through the heater 28 is sent to the thermo housing 1
7, the cooling water that has passed through the carburetor 29 is circulated to the water bypass pipe 20a.

Next, an explanation will be given of the action related to air venting in the embodiment device having the above configuration.

Water injection is performed by draining air from the cooling system under negative pressure using the water injection port 21 and then injecting water. The water injection rate increases as the degree of negative water injection pressure increases, but in order to increase the water injection rate to 95% or more, the water injection negative pressure needs to be a negative pressure of 700 mmHg or more.
When increasing the negative pressure in this manner, the water bypass hose 20b and water inlet hose 18b for insertion into the thermohousing must be made as short as possible to prevent buckling.

When water injection begins, some water falls into the radiator 13, and as the water level rises, it passes through the lower radiator hose 16 to reach the thermo housing 17, and flows into the engine 11 through the water inlet passage 18. . When the water level inside the radiator 13 rises, some of the water flows into the radiator hose 1.
5 to a water outlet 14, and water is injected into the engine 11.

In the above water injection, the air in the cooling system tries to move upward due to buoyancy, and the air in the water inlet passage 1
8 to the thermo housing 17, from the thermo housing 17 further passes through the water bypass passage 20 to the water outlet 14, and further passes through the hot air radiator hose 15 to the radiator 13 where it is extracted. Here, conventionally, the thermo housing was located at a high place and it was difficult to bleed air, but by installing the thermo housing 17 on the transmission 12, it can be lowered, and the water pump 19 and the thermo housing 1
7. By raising the water outlet 14 higher in this order, air can be easily removed using buoyancy. Since the water bypass passage 20 and the water inlet passage 18 are sloped so as to guide air gently upward, movement of the air is not obstructed. Note that by providing three inclined portions in the water bypass passage 20 and the water inlet passage 18, and providing parallel portions before and after the inclined portion, separation and branching of air and cooling water can be facilitated. moreover,
There are also openings 23 and 2 in the thermo housing 17.
6, the air can move smoothly from the water inlet passage 18 to the water bypass passage 20.

[Effect of idea]

From the above explanation, according to the engine cooling system structure of the present invention, the following effects can be obtained.

First, since the positions of the water outlet, thermo housing, and water pump are lowered in this order, the air inside the thermo housing and the air from the cooling system, which was difficult to vent in the past, can be smoothly vented. This makes it possible to eliminate cavitation and the like.

Furthermore, by making the water bypass passage and the water inlet passage gently sloped, or by making the opening position of the water bypass passage into the thermo housing higher than the opening position of the water inlet passage into the thermo housing, the above air venting effect can be achieved. It can be made even more certain.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view of a cooling system for a conventional horizontal engine, Fig. 2 is a schematic plan view of an engine cooling system structure according to an embodiment of the present invention, and Fig. 3 is a schematic front view of the device shown in Fig. 2. 4 is a schematic perspective view of the device shown in FIG. 2, FIG. 5 is a partially cutaway sectional view of the thermo-housing of the device shown in FIG. 2, and FIG. Figure. 11...Engine, 12...Transmission, 13...Radiator, 14...Water outlet, 15...Air pressure radiator hose, 1
6...Lower radiator hose, 17...Thermo housing, 18...Water inlet passage, 1
8a...Water inlet pipe, 18b...
Water inlet hose, 19...water pump, 20...water bypass passage, 20a...
...Water bypass pipe, 20b...Water bypass hose, 21...Water inlet, 22...Engine mount, 23, 26...Opening, 24, 27
... Center of opening, 25 ... Center of thermo housing,
28... Heater, 29... Carburetor.

Claims (1)

[Claims for Utility Model Registration] (1) An upper radiator hose that connects the water outlet of the engine and the radiator, a lower radiator hose that connects the radiator and the thermo housing, and the water outlet and the thermo housing of the engine. An engine cooling system structure for a horizontally mounted engine, comprising a water bypass passage connecting the thermo housing and the water pump, a water inlet passage connecting the thermo housing and the water pump, and a water inlet provided at the top of the radiator. An engine cooling system structure characterized in that the height relationship between the thermo housing and the water pump is lowered in the order of water outlet, thermo housing, and water pump. (2) The engine cooling system structure according to claim 1, wherein the water bypass passage is gradually lowered from the water outlet to the thermo housing. (3) The engine cooling system structure according to claim 1, wherein the water inlet passage is gradually lowered from the thermo housing to the water pump. (4) Registration of a utility model in which the center of the opening of the water bypass passage into the thermo-housing is higher than the center of the thermo-housing, and the center of the thermo-housing is higher than the center of the opening of the water inlet passage into the thermo-housing. An engine cooling system structure according to claim 1.