JPH0558833U - Engine cooling system - Google Patents

Abstract

(57) [Summary] [Purpose] The engine cooling water can be replenished in a short time while ensuring good idle operation of the engine. [Structure] A thermostat 6 is provided in a cooling water outflow passage 4 that connects the engine body 1 and the upper tank 3 of the radiator 2 to each other.
The temperature-sensing valve 20 is provided on the relatively thick air vent pipe 14 that connects the upstream side to the surge tank 11, and the temperature-sensing valve 20 is opened at low temperatures and below the closing temperature of the thermostat 6 at high temperatures. The opening degree of the temperature valve 20 is reduced.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an engine cooling device equipped with a surge tank for cooling water.

[0002]

[Prior Art]

 In vehicle series engines, etc., where the overall height of the engine is higher than that of the radiator's upper tank, a surge tank for engine cooling water is installed, and in the past, the engine side and surge tank were provided with relatively thick water supply pipes. When connecting with a very thin air vent pipe, when the temperature of the cooling water is not so high as during engine idle operation, the cooling water flows from the air vent pipe through the surge tank to the radiator, and the cooling water temperature drops. However, since the air bleeding pipe is very thin, it takes time to bleed the engine cooling water system from the engine side through the air bleeding pipe when supplying water from the surge tank to the engine. There was a problem that the water supply was poor and the water supply was poor.

[0003]

[Problems to be solved by the device]

 The present invention is intended to provide an engine cooling device capable of maintaining good water supply from a surge tank while suppressing a drop in engine cooling water temperature.

[0004]

[Means for Solving the Problems]

 Therefore, the engine cooling device according to the present invention includes a thermostat installed in the engine cooling water flow path between the engine body and the radiator upper part, a surge tank for engine cooling water, and the surge tank and the upper part of the radiator. It has a water supply pipe, an air vent pipe that connects the surge tank to the upstream side of the thermostat, and a temperature-sensitive valve that is provided in the air vent pipe and restricts the flow passage area when the temperature is below the closing temperature of the thermostat. ..

[0005]

[Operation] That is, a temperature-sensing valve is provided in the air bleeding pipe that connects the surge tank and the upstream side of the thermostat, and the temperature-sensing valve is open when the temperature is relatively low such as when water is supplied. By making it relatively thick, water can be supplied from the surge tank to the engine in a short time, but even if the thermostat is closed as in the case of long idle operation of the engine, the temperature is still high due to the temperature sensing valve. Since the flow passage area of the air bleeding pipe is narrowed, the flow of engine cooling water from the air bleeding pipe through the surge tank to the radiator is suppressed, and it is easy for the engine cooling water temperature to drop too much. To be prevented.

[0006]

【Example】

 Hereinafter, embodiments of the present invention shown in the drawings will be specifically described. In FIG. 1, a thermostat case 5 is installed in an inflow passage 4 of engine cooling water that communicates from the upper part of the engine body 1 to an upper tank 3 of a radiator 2, and a thermostat 6 that opens and closes at about 80 ° C is installed inside the case. In addition, the outflow passage 9 is connected from the lower tank 7 of the radiator 2 to the suction side of the cooling water pump 8, and the inside of the thermostat case 5 upstream of the thermostat 6 and the suction side of the cooling water pump 8 are connected to the engine. The cooling water circulation path 10 communicates.

On the other hand, a surge tank 11 is installed above the engine body 1, a pressure cap 12 is installed, and a water supply pipe 13 connects the surge tank 11 and the radiator upper tank 3 with each other, and relatively. Thick air vent pipes 14 and 15 respectively connect the surge tank 11 and the inside of the thermostat case 5 on the upstream and downstream sides of the thermostat 6.

Further, as shown in detail in FIGS. 2 and 3, the connecting portion between the air bleeding pipe 14 and the surge tank 11 has a large diameter integrally provided at the tip of the air bleeding pipe 14. The base 16 is fixed to the wall surface of the surge tank 11, and the temperature sensitive valve 20 is attached to the base 16 inside the surge tank 11.

In the temperature-sensitive valve 20, a base cap 22 having an opening 21 is screwed so as to cover the tip of the base 16, and a disc 24 having a valve hole 23 is in contact with the outer surface of the base cap 22. The valve hole 23 is assembled so that the valve hole 23 overlaps with the opening 21 while being pivotally supported by the protruding shaft 25 of the base cap 22 and connected to the spiral bimetal 26 attached to the protruding shaft 25. As shown, when the cooling water temperature is low, the valve hole 23 is fully opened, but when the temperature reaches the relatively high temperature T1 below the closing temperature of the thermostat 6, the bimetal 26 is energized and circles. When the plate 24 rotates, the valve hole 23 starts to close due to the outer surface of the base cap 22, and when the high temperature T2 below the closing temperature is reached, the opening area of the valve hole 23 becomes the minimum, and And it is configured so that it does not change even at the temperature.

In the above engine, when the engine cooling water is supplied to the engine body 1, when the pressure cap 12 is removed from the surge tank 11 and water is poured into the surge tank 11, the cooling water is sequentially supplied to the water supply pipe 13, the radiator 2, and the outflow. The thermostat 6 flows through the passage 9 and the cooling water pump 8 to the engine main body 1. At this time, the thermostat 6 is closed due to the low temperature of the engine main body 1, but the air in the engine main body 1 has the thermostat on the upstream side of the thermostat 6. Since the air is discharged from the inside of the case 5 to the atmosphere through the surge tank 11 through the fully opened valve hole 23 through the relatively thick air bleeding pipe 14, the engine body 1 is smoothly bleeded, and therefore the water supply work is performed. Can be completed in a short time.

Next, when the engine body 1 is started, since the thermostat 6 is closed, the cooling water is circulated in the engine body 1 through the circulation passage 10 by the operation of the cooling water pump 8 and is cooled quickly. Since the water temperature rises and exceeds the temperature T1, the opening area of the valve hole 23 of the temperature sensitive valve 20 is narrowed and the flow passage area of the cooling water flowing through the air vent pipe 14 is narrowed. Further, when the engine body 1 is in operation, the temperature of the cooling water rises and the thermostat 6 opens, so that the cooling water is sent from the engine body 1 to the radiator 2 to be cooled by the operation of the cooling water pump 8 to overheat the engine body 1. Is prevented.

Further, when the engine body 1 is idled for a long time, the temperature of the cooling water drops and the thermostat 6 closes, but the opening area of the valve hole 23 of the temperature sensitive valve 20 is narrowed. Since the flow area of the cooling water flowing through the air vent pipe 14 is narrowed, even if the air vent pipe 14 is relatively thick, the radiator 2 passes through the air vent pipe 14 from inside the thermostat case 5 on the upstream side of the thermostat 6. The flow of the cooling water to the engine is sufficiently suppressed, and therefore, the cooling water flowing out from the engine body 1 is returned to the engine body 1 through the circulation path 10 and the cooling water pump 8, so that the cooling water temperature is higher than expected. It is surely prevented from descending and does not interfere with idle operation.

That is, by installing the temperature sensitive valve 20 in the air bleeding pipe 14, it is possible to easily improve the water supply while ensuring good idle operation, which is convenient for practical use. The location of the temperature-sensitive valve in the air bleeding pipe may be outside the surge tank 11 as in the above-described embodiment, or at the connection with the thermostat case. In addition, the temperature-sensing valve described above is not limited to simply narrowing the flow passage area of the air vent pipe when the cooling water temperature is relatively high when the thermostat is closed, but it is also possible to completely close it. Needless to say, it is included.

[0014]

[Effect of the device]

 In the engine cooling device according to the present invention, a temperature-sensitive valve is provided in the air vent pipe that connects the surge tank and the upstream side of the thermostat, and the flow passage area is throttled at high temperatures. By making it relatively thick, water can be supplied from the surge tank to the engine in a short time, while the engine cooling water flows from the air bleed pipe through the surge tank to the radiator during idle operation of the engine when the thermostat is closed. The flow of water to the engine is suppressed, and it is easy to prevent the engine cooling water temperature from dropping too low. This makes handling the engine very easy and has a practical effect.

[Brief description of drawings]

FIG. 1 is a schematic layout diagram of an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a main part of the above embodiment.

FIG. 3 is a right side view of FIG.

FIG. 4 is an explanatory view of the operation of the above embodiment.

[Explanation of symbols]

 1 Engine Main Body 2 Radiator 4 Engine Cooling Water Inflow Channel 5 Thermostat Case 6 Thermostat 8 Cooling Water Pump 9 Engine Cooling Water Outflow Channel 11 Surge Tank 13 Water Supply Pipe 14 Air Venting Pipe 15 Air Venting Pipe 16 Base 20 Temperature Sensing Valve 21 Opening 22 Base Cap 23 valve hole 24 disc 25 protruding shaft 26 bimetal

Claims (1)

[Scope of utility model registration request] 1. A thermostat installed in an engine cooling water flow path between an engine body and an upper part of a radiator, a surge tank for engine cooling water, a water supply pipe communicating the surge tank with the upper part of the radiator, and the surge tank. An engine cooling device having an air bleeding pipe communicating with the upstream side of the thermostat and a temperature sensitive valve provided in the air bleeding pipe for narrowing the flow passage area at a high temperature equal to or lower than the closing temperature of the thermostat.