JPH0241445B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine cooling system used in vehicles such as automobiles, and in particular, cooling systems for cooling water-cooled engines in vehicles such as rear engine vehicles and midship engine vehicles. This relates to an engine cooling system for a vehicle that has a radiator at the rear of the vehicle and a radiator at the front of the vehicle interior.

[Prior Art] In vehicles such as automobiles equipped with a water-cooled engine and a radiator, openings for injecting cooling water into the cooling water system and venting air from the system are usually provided at the top of the radiator. As shown in Utility Model Application No. 57-2210, the engine is placed under the driver's seat, the radiator is placed at the very front of the car body, and the space between them extends downward. Even when the radiator is connected by a long pipe, it can be used as an opening/closing opening for injecting cooling water into the cooling water system and venting air from the system, other than the conventional opening/closing opening provided at the top of the radiator. No particular consideration was given to

[Problems to be Solved by the Invention] However, rear engine cars and midship engine cars have a cooling water engine at the rear of the cabin, and the radiator does not effectively use the wind from the vehicle to cool the cooling water. When placed in the front of the passenger compartment for use, cooling water passage means connecting the radiator and the water jacket of the engine is provided extending back and forth under the passenger compartment over a considerable length; In addition, a temperature-sensitive valve is installed in the middle of the cooling water system, which closes when the temperature of the cooling water is low.Depending on the opening and closing port provided at the top of the radiator, air tends to remain in the cooling water system when it is injected, and this air must be removed. hard.

The present invention allows air to be easily vented from the cooling water passage means, radiator, and water jacket during water injection in a vehicle that has a water-cooled engine at the rear of the vehicle interior and a radiator at the front of the vehicle interior. Moreover, it is an object of the present invention to provide an engine cooling device configured to perform the cooling operation reliably.

[Means for Solving the Problem] According to the present invention, the problem is solved in an engine cooling system for a vehicle having a water-cooled engine at the rear of the passenger compartment and a radiator at the front of the passenger compartment. , first cooling water passage means connecting a cooling water outlet of the water jacket of the water-cooled engine to the cooling water inlet of the radiator, and closing the cooling water outlet of the radiator to the cooling water inlet of the water jacket when the engine is cold. A second cooling water passage means connected via a temperature-sensitive valve both extends below the vehicle compartment, and each of the first and second cooling water passage means has a lowermost portion in the middle thereof, and the first and second cooling water passage means each have a lowermost portion in the middle thereof, and The second cooling water passage means monotonically rises from the lower part toward the front of the vehicle to the cooling water inlet and the cooling water outlet of the radiator, respectively, and the second cooling water passage means flows the cooling water of the water jacket from the lowermost part toward the rear of the vehicle. The first cooling water passage means monotonically ascends to the temperature-sensitive valve at the inlet, and the first cooling water passage means monotonically ascends from the bottom toward the rear of the vehicle, and then monotonically descends to the cooling water outlet of the water jacket. A cooling water inlet is provided at a position where the first cooling water passage means reverses from a monotonous rise to a monotonous fall, and an air vent valve is provided at the top of the radiator and at the temperature-sensitive valve. This is achieved by a cooling system for the engine.

[Operations and Effects of the Invention] According to the above-described configuration, cooling water is injected from the cooling water inlet, and at that time, the air vent valves are respectively opened, so that the engine body and the radiator are disposed at a large distance. Even in an engine cooling system that is connected by a cooling water passage means that is lowered in the middle, be sure to vent air from these cooling water passage means, radiator, and water jacket to prevent cooling inside. Can be filled with water.

[Example] The present invention will be described in detail below with reference to the accompanying drawings.

The accompanying figures show an example of a vehicle equipped with an embodiment of an engine cooling system according to the invention. In the figure, 1 is a vehicle body, and the vehicle body defines a vehicle interior 5 having a seat 4 between a front wheel 2 and a rear wheel 3.

A water-cooled engine 6 is placed horizontally at the rear of the vehicle compartment 5. The water-cooled engine 6 has a water jacket 7 extending around the combustion chamber, and a cooling water outlet 8b of the water jacket is connected to a rubber hose 9 and an inlet member 1 having a cooling water inlet 10.
1. A radiator 18 is connected to a cooling water inlet 19 via a rubber hose 12, a metal pipe 13, a rubber hose 14, a metal pipe 15, and a rubber hose 16.

The radiator 18 is provided at the front of the vehicle compartment 5 to receive the running wind, and the cooling water outlet 20 of the radiator is connected to a rubber hose 21, a metal pipe 22, a rubber hose 23, a metal pipe 24, and a rubber hose 2.
5 to a cooling water inlet port 26a of a temperature-sensitive valve 26 attached to the engine 6.

In addition to the air vent valve inlet port, the temperature-sensitive valve 26 includes a bypass port 26b that directly communicates with the water jacket 7 via a bypass cooling water passage 28 formed in the engine 6, and a cooling water passage installed in the engine 6. It has a cooling water outlet port 26c that is communicatively connected to the suction port of the pump 27,
When the temperature of the cooling water is below a predetermined value, the cooling water inlet port 26a is closed, and when the temperature of the cooling water is above a predetermined value, the cooling water inlet port 26a is opened.

The cooling water pump 27 is rotationally driven by the output shaft of the engine 6, sucks cooling water from the cooling water outlet port 26c of the temperature-sensitive valve 26, and supplies the cooling water to the cooling water inlet 8a of the water jacket 7. It's getting old.

In the illustrated embodiment, the first cooling water passage means A connecting the cooling water outlet 8b of the water jacket 7 to the cooling water inlet 19 of the radiator 18 includes:
Rubber hose 9, inlet member 11, and rubber hose 12
A second cooling water passage means B, which is constituted by a metal pipe 13, a rubber hose 14, a metal pipe 15, and a rubber hose 16, and connects the cooling water outlet 20 of the radiator 18 to the cooling water inlet 8b of the water jacket 7 is shown in the figure. In the embodiment shown, it is composed of a rubber hose 21, a metal pipe 22, a rubber hose 23, a metal pipe 24, a rubber hose 25, a temperature-sensitive valve 26, and a cooling water pump 27. Both of these cooling water passage means extend forward and backward below the vehicle compartment 5 (tunnel section in the center of the vehicle compartment), and each has a lowermost part midway as shown by symbols La and Lb. . The first and second cooling water passage means A and B rise monotonically from the lowest portion toward the front of the vehicle. Further, the second cooling water passage means B rises monotonically from its lowest portion toward the rear of the vehicle. The first cooling water passage means A monotonically ascends from its lowest portion toward the rear of the vehicle to the inlet member 11, and then monotonically descends to the cooling water outlet 8b of the water jacket. The inlet member 11 includes a water jacket 7, a radiator 18, a cooling water passage means A,
It is located at the highest position of the cooling water circulation system consisting of B. There is an air vent valve 29 on the top of the radiator 18.
is provided. Also, another air vent valve 30 is installed on the side of the cooling water inlet port 26a of the temperature-sensitive valve 26.
is provided. The air vent valves 29 and 30 are each manually operated on-off valves, and when opened, the inside of the radiator 18 or the temperature-sensitive valve 26 is opened to the atmosphere.

The cooling water is injected through the cooling water inlet 10 with the air vent valves 29 and 30 open. The cooling water injected from the inlet member 10 passes through the rubber hose 9 and flows into the water jacket 7 from the cooling water outlet 8b, and also flows through the rubber hose 12, metal pipe 13, rubber hose 14, metal pipe 15, and rubber hose 16 into the cooling water. It flows into the radiator 18 from the inlet 19. The cooling water that has flowed into the radiator 18 is further passed through the rubber hose 2 from the cooling water outlet 20.
1. The cooling water flows through the metal pipe 22, the rubber hose 23, the metal pipe 24, and the rubber hose 25 into the temperature-sensitive valve 26 from the cooling water inlet port 26a. Since both the air vent valves 29 and 30 are open when this cooling water is injected, air is vented from the radiator 18 and the region closer to the radiator than the lowermost parts La and Lb of the cooling water passage means A and B through the air vent valve 29. This is done through the air vent valve 30 even if the temperature sensitive valve 26 is closed and the area on the engine 6 side from the lowest part Lb of the cooling water passage means B, and the air vent valve 26 is closed. 9 and the cooling water passage means A, air is vented between the lowest part La and the cooling water inlet 10 by alternately injecting air from the cooling water inlet 10.

By venting the air as described above, it is avoided that air remains in the cooling water circulation system.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto, and various other embodiments are possible within the scope of the present invention. This will be clear to those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a vehicle equipped with an embodiment of the engine cooling device according to the present invention;
1 is a block diagram of the engine cooling system shown in FIG. 1. FIG. 1...Vehicle body, 2...Front wheel, 3...Rear wheel, 4...Seat, 5
... Vehicle interior, 6... Water-cooled engine, 7... Water jacket, 8a... Cooling water inlet, 8b... Cooling water outlet,
9...Rubber hose, 10...Cooling water inlet, 11...Inlet member, 12...Rubber hose, 13...Metal pipe, 14...Rubber hose, 15...Metal pipe, 16
...Rubber hose, 18...Radiator, 19...Cooling water inlet, 20...Cooling water outlet, 21...Rubber hose, 2
2... Metal pipe, 23... Rubber hose, 24... Metal pipe, 25... Rubber hose, 26... Temperature sensitive valve, 26
a...Cooling water inlet, 26b...Bypass port, 26
c...Cooling water outlet port, 27...Cooling water pump, 2
8...Bypass cooling water passage, 29, 30...Air vent valve.

Claims (1)

[Claims] 1. In an engine cooling system for a vehicle having a water-cooled engine at the rear of the vehicle interior and a radiator at the front of the vehicle interior, the cooling water outlet of the water jacket of the water-cooled engine is used to cool the radiator. A first cooling water passage means that connects to the water inlet and a second cooling water passage means that connects the cooling water outlet of the radiator to the cooling water inlet of the water jacket via a temperature-sensitive valve that closes when the water jacket is cold are connected to the vehicle. The first and second cooling water passage means extend through the lower part of the chamber, each having a lowermost part in the middle thereof, and a cooling water inlet and a cooling water outlet of the radiator, respectively, from the lowermost part toward the front of the vehicle. The second cooling water passage means monotonically rises from the lowest part toward the rear of the vehicle to the temperature sensing valve at the cooling water inlet of the water jacket. The cooling water passage means monotonically ascends toward the rear of the vehicle from the lowermost portion thereof, and then monotonically descends to the cooling water outlet of the water jacket, and the first cooling water passage means reverses from monotonically rising to monotonically descending. 1. A cooling device for an engine, characterized in that a cooling water inlet is provided at a position where the cooling water is injected, and an air vent valve is provided at the top of the radiator and at the temperature-sensitive valve.