JPH04111522U - engine cooling system - Google Patents

Abstract

(57) [Summary] [Purpose] To solve the problem of cavitation occurring near the pump suction port and ensure a sufficient flow rate of cooling water. [Structure] Cooling water is circulated from the water jacket 2a of the cylinder block 2 to the water jacket 3a of the cylinder head 3 via the radiator 5, water pump 6, and thermostat chamber 4 in this order. Further, an air vent hole 13 is formed near the cooling water inlet 4d of the thermostat chamber 4, and a valve body 13a for opening and closing the air vent hole 13 is interposed.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea was developed for use with thermostats in engine cooling systems installed in motorcycles, etc. This invention relates to a water-cooled engine cooling system equipped with a water-cooled engine.

0002

[Conventional technology]

Utility Model Application Publication No. 2-94323 as a cooling system for engines of motorcycles and automobiles, etc. The device described in has been proposed. As shown in FIG. 5, the device includes an engine body 1 After the cooling water discharged from the cylinder block 2 is sucked in by the water pump 6, the water pump is The cooling water discharged from the pump 6 is sent to the radiator 5 and passes through the thermostat chamber 4. The structure is such that the cylinder head 3 is guided through the cylinder head 3. According to this device, the radio Warm-up operation in which the cylinder head 3 can be cooled by low-temperature cooling water from the etaner 5 Inside, low-temperature cooling water from the radiator 5 immediately flows into the thermostat chamber 4. Since the thermostat valve 4a is closed, the cylinder head 3 and cylinder block There are advantages such as that the warmed cooling water in 2 does not flow out immediately.

0003

[Problem that the idea aims to solve]

However, in the cooling device described in the above publication, the water is introduced into the suction port of the water pump 6. Cooling water cools while passing through the cylinder head 3 and cylinder block 2. In addition, the temperature of the cooling water is rising, and the temperature of the cooling water is increasing in front of the suction port of the water pump 6. Cavitation occurs near the suction port of water pump 6 because the pressure of the cooling water decreases. It is in an easy condition. Therefore, especially when the engine speed is high, Cavitation occurs near the suction port of water pump 6, and the flow rate of cooling water cannot be confirmed sufficiently. There is a risk that the product cannot be maintained.

0004 The primary purpose of this invention is to solve these problems.

[0005] In addition, it improves intake efficiency by improving the flow of intake air within the intake port, Fuel that could not be atomized by the carburetor or fuel injection In order to flow smoothly into the cylinder head along the port wall, Tilt the engine so that the intake port is at the top and the exhaust port is at the bottom. It needs to be tilted. And with the engine tilted like that, for example When installed on a motorcycle, the thermostat chamber is placed on the exhaust port side of the engine. Since it is impossible to do so due to the installation space, the thermostat room is not equipped with an intake port. Can only be placed on the port side. However, normally the coolant inlet is located above the engine. Since the water pump is located below the engine, it is located on the intake port side. If the thermostat room is placed in There is a risk that air may accumulate in the

[0006] This idea eliminates air accumulation when the thermostat chamber is placed on the intake port side. The second objective is to eliminate it.

[0007] Furthermore, when installing an engine on a motorcycle at an angle, the structure The radiator is usually placed slightly above the front of the engine. In such a positional relationship, pipes for circulating cooling water through a radiator, etc. The piping (layout) of the pool becomes complicated.

[0008] This idea circulates cooling water in the engine cooling system installed in motorcycles. The third purpose is to make the piping for the ring look superior.

[0009]

[Means to solve the problem]

In order to achieve the first object mentioned above, the cooling device of the present invention has a thermostatic valve. Cooling of an engine equipped with a thermostatic chamber divided into an upstream chamber and a downstream chamber by In equipment, from the water jacket of the cylinder block to the radiator, water pump, Cooling water passes through the thermostat chamber in order to the water jacket of the cylinder head. It is configured so that it circulates.

0010 In addition, in order to achieve the above-mentioned second objective, the cooling device of the present invention has an intake port Tilt the engine body so that the engine is located at the top and the exhaust port is at the bottom. , the radiator is placed above the engine body, and the water pump is placed below the engine body. and the thermostat chamber is installed on the intake port side of the engine body. An air bleed mechanism is provided near the cooling water inlet of the thermostat chamber.

[0011] Furthermore, in order to achieve the third objective mentioned above, the present invention is installed on a motorcycle. The cooling system for the engine includes the radiator located in front of the engine body and near the top thereof. The water pump is placed near the rear and lower part of the crank chamber at the bottom of the engine body. and the water pump's suction port facing forward and the water pump's discharge port facing upward. and place the first pipe from the bottom end of the radiator to the water pump suction port. At the same time, a second pipe is connected from the outlet of the water pump to the inlet of the thermostat chamber. The pipe is being piped.

0012

[Effect]

According to the cooling device (claim 1) of the present invention having the above configuration, cooling is performed using a radiator. The cooled water flows into the cylinder head via the water pump, so the cylinder head cools down sufficiently. On the other hand, cooling water flows from the cylinder head to the cylinder block. Although the water temperature rises during the passage, the warm cooling water discharged from the cylinder block The water is once cooled down by a radiator and then sucked into the water pump at a lower temperature. Therefore, cavitation may occur near the intake port even when the engine rotates at high speed. The cooling that circulates inside the engine's cylinder head and cylinder block is Sufficient flow of cooling water will be ensured.

[0013] Further, according to the cooling device according to claim 2, since the engine body is tilted, the suction The flow of intake air in the air port is improved, improving intake efficiency, and the carburetor The fuel that was not atomized during fuel injection or fuel injection may flow along the port wall. Since it flows smoothly into the cylinder head, the performance of the engine can be improved. Also, when injecting cooling water into a radiator or cylinder block, etc., the water pump Air may accumulate near the cooling water inlet of the thermostat room, which is located at the highest position across the pipe. In such cases, you can easily remove the air by opening the air bleed mechanism. You can simply pull it out.

[0014] Furthermore, according to the cooling device according to claim 3, when the device is mounted on a motorcycle In addition, when viewed from the side, most of the third pipe is hidden behind the first pipe and is not exposed. Additionally, the first pipe is usually placed parallel to the down frame of the motorcycle (see Figure 4). (see), and the length of the second pipe is short and it is placed at the rear of the engine. Each pipe is neat and beautiful in appearance.

[0015]

【Example】

Hereinafter, embodiments of the engine cooling device of this invention will be described based on the drawings. FIG. 1 is a side view showing an engine cooling system according to an embodiment of the present invention, and FIG. FIG. 3 is a schematic configuration diagram of the cooling device shown in FIG. 1.

[0016] As shown in Fig. 1, the engine body 1 is a water-cooled four-stroke engine. The main body 1 has an intake port 1a located on the upper side and an exhaust port 1b located on the lower side. The front of the engine body 1 (left side in the figure) A radiator 5 is arranged slightly above the engine body 1. engine body An air cleaner 11 is arranged behind and above the air cleaner 1, and the air cleaner 11 and the engine A carburetor 12 is interposed between the intake ports 1a of the main body 1. on the other hand, One end of an exhaust pipe 14 is connected to the exhaust port 1b.

[0017] A crank chamber 15 is located at the bottom of the engine body 1, and almost all of this crank chamber 15 is located at the bottom of the engine body 1. A water pump 6 is disposed near the rear and lower part of the crankshaft (not shown) located in the center. It is set up.

[0018] As shown in Fig. 2, the thermostat chamber 4 controls the flow path of the cooling water according to the temperature of the cooling water. It is divided into an upstream chamber 4b and a downstream chamber 4c by a thermostatic valve 4a that opens and closes. As shown in FIG. The upstream chamber 4b of the mostat chamber 4 is bypassed to the water jacket 3a of the cylinder head 3. The downstream chamber 4c is connected to the water jacket by the main passage 17. 3a.

[0019] As shown in FIG. 1, the lower end (drain port) of the radiator 5 and the suction The inlet 6a is connected to the cooling water inlet of the thermostat chamber 4 by the first pipe 7. 4d and the discharge port 6b of the water pump 6 are connected by a second pipe 8. Sara , above the drain port 2b of the engine body 1 (cylinder block 2) and the radiator 5. The end portion (inflow port) is connected by a third pipe 9. This third pipe 9 A cooling water inlet 10 is provided in the middle. Note that the injection port 10 is equipped with a cap. 10a is covered.

[0020] As described above, as shown in FIG. 3, the water is discharged from the water pump 6 and the thermostat water jacket 3a of cylinder head 3, water jacket 3a of cylinder block 2 Cooling water is circulated through the water pump 6 via the water pump 6 and the radiator 5 in this order. The cooling device is configured.

[0021] By the way, as is clear from FIG. 3 or FIG. It is located at the highest point in the route, and the cooling water inlet 4d of the thermostat chamber 4 is also connected to water. It is located at the highest point with the pump 6 in between. Therefore, from the inlet 10 When injecting cooling water, etc., the cooling water inlet 4d of the thermostat chamber 4 and the water pump 6 The air between the discharge ports 6b does not escape and accumulates near the cooling water inlet 4d, causing an air reservoir. Mari can sometimes occur. Therefore, as shown in Fig. 2, the uppermost part near the cooling water inlet 4d is An air bleed hole 13 is bored at the position, and a valve body 13a for opening and closing this air bleed hole 13 is provided. I am intervening.

[0022] Next, the flow of cooling water in the cooling device of the above embodiment will be explained. When starting the engine, the temperature of the cooling water is low, so the thermostat in thermostat chamber 4 The thermostat valve 4a is closed, and the cooling water sent out from the water pump 6 is Water is supplied to the cylinder head 3 from the upstream chamber 4b of the cut chamber 4 through the bypass passage 16. It flows into the container 3a. Therefore, the cooling water flows into the downstream chamber 4c of the thermostat chamber 4. And the main passage 17 does not pass through. This limits the circulating flow of cooling water, A warm-up operation is performed.

[0023] In this way, the temperature of the cooling water increases, and the water jacket 3a of the cylinder head 3 (accurately When the temperature of the cooling water in the thermostat chamber 4) reaches a predetermined temperature, the valve 4a is turned on. The cooling water from the water pump 6 flows downstream from the upstream chamber 4b of the thermostat chamber 4. As the water flows into the chamber 4c, the water temperature decreases and the valve 4a is closed again to perform warm-up operation. Ru. This operation is repeated and the water flows into the jacket 3a of the cylinder head 3. The temperature of the cooling water gradually rises, and the valve 4a of the thermostat chamber 4 is kept open. The warm-up operation ends.

[0024] In addition, in the cooling device of the present invention, the cooling water sent out from the water pump 6 is tat chamber 4, water jacket 3a of cylinder head 3, water jacket of cylinder block 2 The water flows through the jacket 2a, radiator 5, and water pump 6 in this order. Therefore, the water pump The cooling water sucked in from the suction port 6a of 6 is cooled by the radiator 5 and the water temperature is lowered. cavitation occurs even if the engine speed increases. There is little risk. Therefore, a sufficient circulating flow rate of cooling water is ensured. deer Also, the water jacket 3a of the cylinder head 3 is cooled by the radiator 5 and has a low water temperature. Since the reduced cooling water flows in, the cylinder head 3 is sufficiently cooled and intake efficiency is improved. It also improves.

[0025] Figure 4 shows a side view of the above-mentioned engine cooling device mounted on motorcycle A. It is a front view. As shown in the figure, the engine body 1, etc. is connected to the upper side frame U. The radiator 5 is housed in a space surrounded by the down frame D, and the radiator 5 has a cover C. is installed. For this reason, the first pipe connecting the radiator 5 and the water pump 6 is Only the pipe 7 and the second pipe 8 connecting the water pump 6 and the thermostat chamber 4 are exposed. However, the first pipe 7 is arranged almost parallel to the down frame D, and the cooling device ( The piping that makes up part of the building is well-organized and has a beautiful appearance. Note that the third pipe 9 is It is usually painted black and is located on the back side of the first pipe 7, making it conspicuous. Not worth it.

[0026]

[Effect of the idea]

As is clear from the above explanation, the engine cooling system of this invention is as described above. This structure has the following effects.

[0027] (1) Cooling water cooled by the radiator is sucked into the pump, so the above public Unlike the cooling system described in the report (Utility Model Application Publication No. 2-94323), the engine speed is high. However, there is little risk of cavitation occurring near the pump suction port. This makes it possible to secure a sufficient flow rate of cooling water.

[0028] (2) In the cooling device according to claim 2, the engine is arranged such that the intake port is located on the upper side and the exhaust port is located on the upper side. Tilt it so that the intake port is on the bottom side, and install a thermostat on the intake port side. When a thermostat chamber is installed, air accumulates near the cooling water inlet of the thermostat chamber. Even if something happens, you can easily bleed the air out. In addition, the intake air inside the intake port Improve the intake efficiency by improving the flow, or if the air cannot be completely atomized using a carburetor, etc. This allows fuel to flow smoothly into the cylinder head along the port wall. Engine performance can be easily improved.

[0029] (3) In the cooling device according to claim 3, the engine is mounted on a motorcycle at an angle. pipes for circulating cooling water through radiators etc. Out) can be made visually beautiful.

[Brief explanation of drawings]

FIG. 1 is a side view showing an engine cooling device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II in FIG. 1;

FIG. 3 is a schematic configuration diagram of the cooling device shown in FIG. 1.

FIG. 4 is a side view showing a state in which an engine cooling device is mounted on a motorcycle.

FIG. 5 is a schematic configuration diagram showing an example of a conventional engine cooling device.

[Explanation of symbols]

1 Engine body 2 cylinder block 3 Cylinder head 2a, 3a water jacket 4 Thermostat room 4a Thermostatic valve 4b Upstream room 4c downstream chamber 5 Radiator 6 water pump 7, 8, 9 Pipes (piping) A Motorcycle

Claims (3)

[Scope of utility model registration request] Claim 1: In an engine cooling system equipped with a thermostatic chamber divided into an upstream chamber and a downstream chamber by a thermostatic valve, a water jacket of a cylinder block is passed through a radiator, a water pump, and the thermostat chamber in order. An engine cooling device characterized in that it is configured so that cooling water circulates to a water jacket of a cylinder head. 2. The engine body is tilted so that the intake port is located on the upper side and the exhaust port is located on the lower side, and the radiator is placed above the engine body, and the water pump is placed below the engine body. 2. The engine cooling system according to claim 1, wherein the thermostat chamber is mounted on the intake port side of the engine body, and an air bleed mechanism is provided near the cooling water inlet of the thermostat chamber. 3. A cooling device for an engine mounted on a motorcycle, wherein the radiator is arranged in front of and above the engine body, and the water pump is arranged below the rear of a crank chamber in the lower part of the engine body. At the same time, the suction port of the water pump faces forward and the discharge port of the water pump faces upward, and the first pipe is connected from the lower end of the radiator to the suction port of the water pump. A second pipe is connected from the cooling water outlet on the exhaust port side of the engine body to the upper end of the radiator, and a third pipe is connected to the back side of the first pipe when viewed from the side. 3. The engine cooling device according to claim 2, wherein the engine cooling device is arranged in parallel with the first pipe.