JPH06117248A - Engine cooling device - Google Patents

Abstract

PURPOSE:To increase a cooling water temperature at the time of cooling an engine in a short time so as to rapidly warm up the engine and also improve fuel consumption and decrease content rate of harmful material in exhaust gas. CONSTITUTION:A communication hole part 14 is provided for communicating an upstream position with a downstream position of a water jacket 12, and an opening/closing valve 16 operated in opening at the time of cooling an engine 2 so as to form a circulation passage inside the engine 2, is provided in the communication hole part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine cooling device, and more particularly, to a radiator inlet / radiator outlet passage for circulating cooling water cooled by a radiator to a water jacket in an engine, whichever of the radiator inlet / radiator outlet passage is provided. A thermostat and a water pump are installed in the middle
The present invention relates to an engine cooling device in which a heater passage provided with a heater is provided so as to bypass a radiator and a bypass passage provided to bypass the radiator is provided.

[0002]

2. Description of the Related Art An engine is cooled by an air cooling system or a water cooling system in order to maintain an appropriate engine temperature. In the water-cooled type, cooling is performed by circulating cooling water between a water jacket and a radiator in the engine via a water pump and a thermostat.

In such a water-cooled engine cooling device, as shown in FIG. 4, a water pump (not shown) in the engine 102 is provided with a water pump 108 at the jacket inlet portion, and the water pump 1
The thermostat 162 is arranged at a position upstream of the water pump 108, for example, close to 08. A radiator inlet passage 16 of a radiator 164 is provided at a jacket outlet portion of the water jacket (not shown).
6 are in communication.

A downstream side portion of the radiator outlet passage 168 communicates with an upstream side portion of the thermostat 162. At the downstream side of the thermostat 162, an upstream side of the bypass passage 152, an upstream side of a pump inlet passage (not shown) communicating with the water pump 108, and a heater 170 disposed in the middle of the heater. The upstream side portion of the use passage 172 is communicated. A downstream side portion of the bypass passage 152 is connected to a jacket outlet portion. The heater passage 172
The downstream side of the is connected to the jacket outlet.

Reference numeral 174 is a reservoir tank.

Further, as a cooling device for an internal combustion engine, as disclosed in Japanese Patent Laid-Open No. 58-18513, a water pump for supplying cooling water to a water jacket according to the number of revolutions of the internal combustion engine, and a water pump There has been provided with a bypass passage that connects the inlet portion and the outlet portion and a bypass valve that controls the flow rate of the cooling water that is bypassed from the water pump to the bypass passage according to the load of the internal combustion engine.

[0007]

In the conventional engine cooling apparatus, as shown in FIG. 4, the engine 102 such as the bypass passage 152 and the heater passage 172 is cooled even when the engine 102 having the thermostat 162 closed is cooled. It has a structure in which a large amount of cooling water flows to the outside.

Therefore, when the engine 102 is cooled, the cooling water is outside the engine 102 and the bypass passage 152,
It was cooled in the heater passage 172, and it took a long time to raise the temperature of the cooling water.

As a result, a large amount of time is required to raise the heater temperature, which is disadvantageous in practical use, and the thermal efficiency and fuel efficiency of the engine 102 during cold operation are deteriorated, which is economically disadvantageous. There was an inconvenience.

Further, there is a disadvantage that the content rate of harmful substances in the exhaust gas is increased due to the deterioration of the thermal efficiency and fuel consumption of the engine 102 when the engine is cold.

[0011]

In order to eliminate the above-mentioned inconvenience, the present invention provides a radiator inlet / radiator outlet passage for circulating cooling water cooled by a radiator to a water jacket in an engine. In an engine cooling device in which a thermostat and a water pump are provided in the middle of one of the inlet / radiator outlet passages, a heater passage provided with a heater is arranged to bypass the radiator, and a bypass passage bypassed the radiator is provided. A connecting hole portion that connects an upstream side portion and a downstream side portion of the water jacket is provided, and an opening / closing valve that is opened when the engine is cold and forms a circulation path in the engine is provided in the communication hole portion. Characterize.

[0012]

According to the invention as described above, at the time of cooling the engine, the opening / closing valve provided in at least one of the water jacket on the cylinder block side and the water jacket on the cylinder head side is opened to facilitate the flow of the cooling water. The cooling water temperature is raised in a short time by circulating the cooling water only in the engine.

[0013]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, 2 is an engine and 4 is a cylinder block. The engine 2 has a cylinder block 4 and a cylinder head (not shown) attached to the upper portion of the cylinder block 4.

As shown in FIG. 1, the cylinder block 4 has a plurality of, for example, three first to third cylinders 6-1.
6-3 are arranged in parallel from one end side to the other end side (right side to left side in FIG. 1) of the cylinder block 4, and
One end side of the cylinder block 4 (right side in FIG. 1)
A water pump mounting portion 10 for mounting the water pump 8 is formed on the. A thermostat (not shown) is arranged upstream of the water pump 8.

Further, a communication hole portion 14 that connects the upstream side portion and the downstream side portion of the water jacket 12 is provided, and the communication hole portion 14 is opened during cooling of the engine 2 and circulates in the engine 2. Open / close valve 16 forming a path
Is provided.

More specifically, the water jacket 12
Is formed by a cylinder block side water jacket 18 and a cylinder head side water jacket (not shown).

The cylinder block side jacket 18
Is formed between the outer surface portion of the cylinder block inner wall 4A and the inner surface portion of the cylinder block outer wall 4B forming the first to third cylinders 6-1 to 6-3.

The cylinder block side water jacket 18 includes a first cylinder block side water jacket 20 and a second cylinder block side water jacket 22.
And have.

The water jacket 20 on the first cylinder block side is a first attachment to which a radiator water outlet passage (not shown) provided at one end on the other side (lower side in FIG. 1) of the cylinder block 4 is connected. The mouth portion 24 and the water pump suction port portion 26 provided in the water pump mounting portion 10 are connected to each other. The radiator outlet passage (not shown) communicates with a radiator (not shown).

In addition, the second cylinder block side water jacket 22 has one end (upper side in FIG. 1) and the other end (FIG. 1) of the water pump discharge port portion 28 provided in the water pump mounting portion 10 from the water pump discharge port portion 28. 1) to the other side (lower side in FIG. 1) of the cylinder block 4 and surrounds the first to third cylinders 6-1 to 6-3.

Further, the cylinder head side water jacket (not shown) is formed on the cylinder head (not shown). A radiator inlet passage (not shown) is connected to the water jacket (not shown) on the cylinder head side. A radiator (not shown) is connected to the radiator inlet passage (not shown).

Further, a heater passage (not shown) is provided to bypass the radiator (not shown). A heater (not shown) is arranged in the middle of the heater passage (not shown).

A bypass passage (not shown) is provided to bypass the radiator (not shown).

Further, there is provided a communication hole portion 14 which connects a downstream side portion of the second cylinder block side water jacket 22 constituting the water jacket 12, for example, the cylinder block side water jacket 18 and an upstream side portion of the first water jacket 20. . And this communication hole portion 14
For example, a thermal expansion type on-off valve 16 is provided in the.

The open / close valve 16 is opened when the engine 2 is cold, and forms a circulation path for cooling water in the engine 2.

Next, the operation will be described.

When the engine 2 is cold, the downstream side portion of the water jacket 22 constituting the water jacket 12 and the downstream side portion of the water jacket 22 and the first water jacket 20.
The opening / closing valve 16 provided in the communication hole portion 14 that communicates with the upstream side portion of the engine is opened to form a circulation path of the cooling water in the engine 2, and the cooling water is circulated only in the engine 2 to cool the cooling water. Raising the temperature in a short time.

As a result, the temperature of the cooling water when the engine 2 is cold can be raised in a short time, and the engine 2
Can be warmed up rapidly, which is practically advantageous.

By rapidly warming up the engine 2, the combustion state of the engine 2 can be improved, and
Fuel economy can be improved and it is economically advantageous.

Further, since the combustion state of the engine 2 is improved, the content rate of harmful substances in the exhaust gas can be reduced.

The present invention is not limited to the above-mentioned embodiment, but various application modifications are possible.

For example, in the embodiment of the present invention, a communication hole portion for connecting the downstream side portion of the second cylinder block side water jacket 22 and the upstream side portion of the first water jacket 20 which constitute the cylinder block side water jacket 18. 14 is provided, and the opening / closing valve 1 is provided in this communication hole portion 14.
6, the cylinder head 42 is provided with a cylinder head side water jacket 44 connected to the cylinder block side water jacket 18 provided in the cylinder block 4, as shown in FIG. Communication hole 46 for connecting 44 and the water jacket 18 on the cylinder block side
It is also possible to use by providing an opening / closing valve 48 in this communication hole portion 46.

Then, similarly to the above-mentioned embodiment, the temperature of the cooling water when the engine 2 is cooled can be raised in a short time, and the engine 2 can be rapidly warmed up, which is practically advantageous.

By rapidly warming up the engine 2, the combustion state of the engine 2 can be improved, and
Fuel economy can be improved and it is economically advantageous.

Further, since the combustion state of the engine 2 is improved, the content ratio of harmful substances in the exhaust gas can be reduced.

Furthermore, in the above-described embodiment, the communication hole portion 14 which connects the downstream side portion of the second cylinder block side water jacket 22 and the upstream side portion of the first water jacket 20 which constitute the cylinder block side water jacket 18. The opening / closing valve 1 is provided only in this communication hole portion 14.
6 is provided. Alternatively, as shown in FIG. 2, a communication hole portion 46 that connects the cylinder head side water jacket 44 provided in the cylinder head 42 and the cylinder block side water jacket 18 is provided, and the opening / closing valve 48 is provided only in this communication hole portion 46. However, as shown in FIG. 3, the on-off valve 56 is provided upstream of the bypass passage 52 and the heater passage 54 in accordance with either one of the above-described two embodiments.
It is also possible to arrange and use.

As a result, the time required for the temperature of the cooling water to rise when the engine 2 is cold can be further shortened.

Further, although the thermal expansion type on-off valve is used in the above-mentioned embodiment, this on-off valve may be an electromagnetic type or any other type which can be opened as long as the engine is cold. You can also

[0040]

As described in detail above, according to the present invention, a communication hole portion for connecting the upstream side portion and the downstream side portion of the water jacket is provided, and the communication hole portion is opened when the engine is cold. Since the on-off valve that forms the circulation path is provided therein, the temperature of the cooling water when the engine is cold can be raised in a short time, and the engine can be warmed up rapidly, which is practically advantageous. Further, by rapidly warming up the engine, the combustion state of the engine can be improved and the fuel consumption can be improved, which is economically advantageous. Further, by improving the combustion state of the engine, the content of harmful substances in the exhaust gas can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a cylinder block of an engine showing an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of an engine showing another embodiment of the present invention.

FIG. 3 is a schematic explanatory view of an engine cooling device showing another embodiment of the present invention.

FIG. 4 is a schematic explanatory diagram of an engine cooling device showing a conventional technique of the present invention.

[Explanation of symbols]

 2 Engine 4 Cylinder Block 6-1 1st Cylinder 6-2 2nd Cylinder 6-3 3rd Cylinder 8 Water Pump 10 Water Pump Attachment 12 Water Jacket 14 Communication Hole 16 On-off Valve 18 Cylinder Block Side Water Jacket 20 1st Cylinder block side water jacket 22 Second cylinder block side water jacket 24 First mounting port section 26 Water pump suction port section 28 Water pump discharge port section

Claims (1)

[Claims] 1. A radiator inlet / radiator outlet passage for circulating cooling water cooled by a radiator to a water jacket in an engine, and a thermostat and a water pump are provided in the middle of any one of the radiator inlet / radiator outlet passages. In an engine cooling device in which a heater passage having a heater is arranged so as to bypass the radiator and a bypass passage that bypasses the radiator is provided, a communication hole that connects an upstream side portion and a downstream side portion of the water jacket. An engine cooling device, characterized in that an opening / closing valve is provided in the communication hole, the opening / closing valve being opened when the engine is cold to form a circulation path in the engine.