JP2002004858A - Vehicular cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular cooling device, capable of performing air bleeding in a short time. SOLUTION: This vehicular cooling engine is provided with a radiator 1, a thermostat 9, a water pump 7 and an engine 4, a circulating path is formed of hoses 6, 8 so as to allow cooling water to flow in this order, and a bypass passage is formed by connecting an upper tank 11 and the thermostat 9 to each other by a hose 3. Since cooling water flows through the upper tank 11 and the bypass passage 3, when the thermostat 9 is closed immediately after the start of the engine, cooling water containing air is separated into gas and liquid by the upper tank 11, and air bleeding can be performed in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system for a vehicle which separates and removes air mixed in cooling water of an engine for a vehicle.

[0002]

2. Description of the Related Art An example of a conventional vehicle cooling system is shown in FIG. In the vehicle cooling device, a radiator 81, a thermostat 82, a water pump 83, an engine 84
Circulation paths 85 and 86 are formed so that the cooling water circulates between them, and a bypass passage 87 is formed so as to bypass the radiator 81. The thermostat 82 is a valve that automatically operates in accordance with the water temperature. When the temperature of the cooling water is low, for example, when the engine is started, the valve closes and does not flow the cooling water to the radiator 81. The cooling water sent from the engine 83 is circulated in the engine 84, and when the temperature of the cooling water rises above a predetermined temperature, a valve is opened to allow the cooling water to flow to the radiator 81. As a result, the temperature of the cooling water is maintained at a predetermined value.

In such a cooling device, if air is mixed into the cooling water, the smooth circulation of the cooling water is impeded, and a sufficient cooling effect cannot be obtained. Therefore, conventionally, the air bleeding operation has been performed as follows. That is, after supplying the cooling water at the time of factory shipment or maintenance, etc., the engine is warmed up to raise the cooling water temperature, and the thermostat 82
The cooling water is supplied by opening the valve of the upper tank 8 at the top of the cooling system.
Lead to 8. As a result, the cooling water containing air is separated into gas and liquid in the upper tank 88, and the air is collected at the upper part of the upper tank 82.

[0004]

However, in the conventional cooling device described above, when the temperature of the cooling water is low, the thermostat 82 closes and the cooling water does not flow to the radiator 81, so that the cooling water must be guided to the upper tank 88. It is necessary to warm up the engine 84 and wait until the thermostat 82 opens, and there is a problem that it takes time to bleed the air.

[0005] It is an object of the present invention to provide a vehicular cooling apparatus that can perform an air bleeding operation in a short time with a simple configuration.

[0006]

A description will be given with reference to the drawings showing an embodiment. (1) As shown in FIG. 1, the first aspect of the present invention provides a radiator 1 through which cooling water flows from an upper tank 11 to a lower tank 12, and a first water inlet when the cooling water temperature is higher than a preset value T0. While the cooling water temperature is lower than the value T0, the second water inlet 9b is connected to the second water inlet 9b.
A circulation path 6,8 is formed so that cooling water flows in the order of the thermostat 9 and the engine 4, and the temperature of the cooling water flowing out of the engine 4 is lower than the value T0. Is applied to a vehicular cooling system that flows from the bypass passage 3 to the thermostat 9 without being cooled by the radiator 1. The above-described object is achieved by the configuration in which the bypass passage 3 connects the upper tank 11 and the second water inlet 9 b of the thermostat 9. (2) The invention according to claim 2 is the vehicle cooling device according to claim 1, wherein the upper tank 11 is provided as shown in FIG.
Has a bulging portion 11b below the bottom surface thereof, and the bypass passage 3 is connected to the bulging portion 11b. (3) The radiator 1 through which the cooling water flows from the upper tank 11 to the lower tank 12 as shown in FIG. 7, and the first water inlet when the cooling water temperature is higher than a preset value T0, as shown in FIG. While the cooling water temperature is lower than the value T0, the second water inlet 9b is connected to the second water inlet 9b.
A thermostat 9 for communicating the cooling water flowing out of the engine 4 to the upper tank 11, and a thermostat 9 for the cooling water flowing out of the lower tank 12 to the engine 4. When the temperature of the cooling water flowing out of the engine 4 is lower than the value T 0, the cooling water is supplied to the sending-side passage 6.
Passage 31 that branches off from and leads to the thermostat 9
The present invention is applied to a vehicle cooling device having: The internal conduit 3 extends into the feed passage 6 and the bypass passage 31 and reaches the bypass passage 31 from the upper tank 11.
The above-mentioned object is achieved by providing 2.

In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0008]

According to the present invention, the following effects can be obtained. (1) According to the first aspect of the invention, when the thermostat does not operate, that is, when the temperature of the cooling water is equal to or lower than a preset value, the cooling water flowing out of the engine flows into the engine from the upper tank of the radiator through the thermostat. As a result, the cooling water passes through the upper tank regardless of whether the thermostat is opened or closed, and is separated into gas and liquid in the upper tank, so that the air bleeding operation can be performed in a short time with a simple configuration. (2) According to the second aspect of the present invention, since the bypass passage is connected to the bulging portion below the bottom surface of the upper tank, even if the water level of the cooling water drops to near the bottom surface of the upper tank, the bypass passage is formed. There is no re-entrance of air. (3) According to the third aspect of the present invention, there is provided a vehicle cooling device having a sending-side passage for leading cooling water flowing out of an engine to an upper tank of a radiator, and a bypass passage branching from the sending-side passage and leading to a thermostat. The cooling water passes through the upper tank regardless of the opening and closing of the thermostat because the internal pipe extending from the feed side passage and the bypass passage to the bypass passage from the upper tank is provided. The air bleeding operation can be performed in a short time without changing the external shape of the cooling water channel.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. -First Embodiment- FIG. 1 is a side view showing a schematic configuration of a vehicle cooling device according to a first embodiment of the present invention, and FIG. 2 is a vehicle having a radiator 1 constituting the cooling device. It is a perspective view from the back. As shown in FIG. 2, the radiator 1 includes an upper tank 11 and a lower tank 12 formed by an aluminum press.
And a plurality of cooling water tubes 13 and fins 14 (only some of which are shown) alternately arranged between the tanks 11 and 12. A cap 15 for injecting cooling water is attached to an upper part of the upper tank 11. A hose 15a is connected to the cap 15, and the hose 15a is connected to an open-to-atmosphere type reserve tank 2 (see FIG. 1) disposed below the upper tank 11. The upper tank 11 and the lower tank 12 are provided with hose mounting ports 11a and 12a, respectively, toward the rear side of the vehicle, and a substantially L-shaped puddle portion 11b is provided integrally with the tank 11 at a side end of the upper tank 11. . As shown in FIG. 3 which is a cross-sectional view of the upper tank 11, the puddle portion 11b is provided so as to protrude below the bottom surface of the upper tank 11, and the hose 3 is connected to a discharge port 11c at the lower end.

Although not shown in detail in FIG. 1, a water passage (water jacket) through which cooling water passes is provided inside the engine 4. The water jacket branches to the radiator 1 side and the heater 5 side, and the outlet of the water jacket on the radiator 1 side is connected to the hose mounting port 11a of the upper tank 11 via the upper hose 6. At the entrance of the water jacket, a water pump 7 driven by the engine 4 is installed. A hose mounting port 12 a of the lower tank 12 is connected to a thermostat 9 via a lower hose 8, and the thermostat 9 is connected to a suction port of the water pump 7. Also,
The puddle portion 11b is connected to the thermostat 9 via the hose 3.
To form a bypass passage that bypasses the radiator 1. Although the cooling device includes a cooling fan and the like, illustration thereof is omitted.

The thermostat 9 is a valve that automatically operates according to the temperature of the cooling water, and the temperature of the cooling water is set to a set value T0.
When the temperature is lower than (for example, 80 ° C.), the valve is closed to connect the water inlet 9 b and the water outlet 9 c of the thermostat 9.
Thereby, the flow of the cooling water in the lower hose 8 is blocked, and the cooling water flows to the engine 4 through the bypass passage 3. On the other hand, when the temperature of the cooling water becomes higher than the set value T0, the valve is opened to connect the water inlet 9a and the water outlet 9c.
Thereby, the flow of the cooling water in the bypass passage 3 is blocked, and the cooling water flows to the engine 4 through the lower hose 8. By opening and closing such a valve, the amount of cooling water passing through the radiator 1 is adjusted, and the cooling water temperature is kept constant.

Next, the operation of the cooling device according to the first embodiment will be described. In performing the air bleeding operation, first, the radiator cap 15 is opened, and z in FIG.
After the cooling water is completely filled as shown in FIG. 1, the cap 15 is closed and the engine 4 is started. As a result, the water pump 7 is driven, and the cooling water passes through the water pump 7 and the water jacket in the engine 4 and is distributed to the heater 5 and the radiator 1. In this case, since the cooling water temperature is low after the engine is started, the valve of the thermostat 9 is kept closed, and the radiator 1
The cooling water distributed to the side sequentially flows through the upper hose 6, the upper tank 11, the hose 3, the thermostat 9, and the water pump 7.

By the circulation of the cooling water, the air mixed in the cooling water is separated into gas and liquid in the upper tank 11 located at the uppermost position of the circulation path, and the air is collected at the upper part of the upper tank 11. As a result, the amount of cooling water in the upper tank 11 decreases as indicated by z2 in FIG. 3, but the reduced amount is automatically replenished from the reserve tank 2 by the pressure difference. 11 is filled with sufficient cooling water. Further, since the puddle portion 11b is located at a position lower than the bottom surface of the upper tank 11, even if the water level of the cooling water temporarily drops near the bottom surface of the tank 11, only the cooling water flows through the hose 3, and the upper tank 11 The air separated at 11 does not mix again.

When the temperature of the cooling water rises to a predetermined value T0, the valve of the thermostat 9 opens to open the upper tank 1
The cooling water 1 flows sequentially through the cooling water tube 13, the lower tank 12, the lower hose 8, the thermostat 9, and the water pump 7. By passing the cooling water through the inside of the radiator in this manner, the temperature of the cooling water is reduced by heat exchange, and the engine 4 is maintained at an appropriate temperature. Again,
Since the cooling water passes through the upper tank 11, the cooling water and the air are continuously separated into gas and liquid.

As described above, according to the first embodiment, the upper tank 11 and the water inlet 9b of the thermostat 9 are connected by the hose 3 to form the bypass passage of the radiator 1, so that the opening and closing of the thermostat 9 is not affected. The cooling water passes through the upper tank 11. As a result, the cooling water and the air are gas-liquid separated in the upper tank 11, and the air bleeding operation can be performed immediately after the start of the engine with a simple configuration without increasing the number of pipes and the like. Further, a puddle portion 11b is provided below the bottom surface of the upper tank 11, and the puddle portion 1b is provided.
Since the hose 3 is connected to 1b, re-mixing of air into the bypass passage 3 can be prevented. Further, when the thermostat 9 is open, the bypass passage 3 is closed, so that the flow rate of the radiator 1 does not become insufficient.

In the first embodiment, the puddle portion 11b
Is formed integrally with the upper tank 11, but the puddle portion 11 b may be formed separately from the upper tank 11. One example is shown in FIGS. In FIG. 4A,
A puddle portion 11b is formed by an L-shaped pipe 21. One end of the pipe 21 is fitted into the mounting hole 11d on the side of the upper tank via an O-ring 22, and the other end is connected to the hose 3 via a clamp 23. . In FIG. 5A, the puddle portion 11b is formed by an L-shaped hose 24, and the hose 2
One end of 4 is fitted to the protrusion 11e on the side of the upper tank via a clamp 25, and the other end is integrally joined to the hose 3 via a hose contraction tube 26. The cross-sectional shapes of these fitting portions are as shown in FIGS. 4 (b) and 5 (b). With the configuration as shown in FIGS. 4 and 5, the conventional upper tank can be diverted without significant modification. In the above,
Although the puddle portion 11b is provided on the side portion of the upper tank 11, it may be provided on the rear portion of the upper tank 11, as shown in FIG.

Second Embodiment FIG. 7 is a diagram showing a configuration of a cooling device according to a second embodiment of the present invention. The same portions as those in FIG. 1 are denoted by the same reference numerals, and the differences will be mainly described below. As shown in FIG. 7, in the second embodiment, a hose 31 branching from the upper hose 6 and reaching the thermostat 9 is provided, and the hose 31 forms a bypass passage. Further, an internal pipe 32 is provided to extend into the upper hose 6 and the hose 31 so as to reach the inside of the hose 31 from the upper tank 11, and both ends 32a and 32b of the internal pipe 32 are fixed to the hoses 6 and 31, respectively. I have. One end 32c of the internal pipe 32 projects downward in the upper tank 11 and opens below the surface of the cooling water, thereby preventing air from entering the internal pipe 32 from the upper tank 11. Further, the other end 32b of the internal pipe 32 opens along the hose 31 so that the hose 31
Backflow to the internal piping 32 is prevented.

With such a configuration, when the thermostat 9 is closed when the engine is started, a part of the cooling water flowing from the engine 4 to the upper hose 6 is supplied to the hose 31,
The remainder of the cooling water flows sequentially through the thermostat 9 and the water pump 7, and after passing through the upper tank 11, flows sequentially through the internal piping 32, the hose 31, the thermostat 9, and the water pump 7. Thereby, the cooling water is gas-liquid separated in the upper tank 11. When the thermostat 9 opens due to an increase in the cooling water temperature, the engine 4
The cooling water flowing into the upper tank 11 and the lower tank 1
2, the lower hose 8, the thermostat 9, and the water pump 7 flow sequentially. Also in this case, the cooling water is gas-liquid separated in the upper tank 11.

As described above, according to the second embodiment, the bypass passage 31 extending from the upper hose 6 to the thermostat 9 is provided, and the internal pipe 32 extending into the upper hose 6 and the hose 31 and reaching the bypass passage 31 from the upper tank 11. So that the thermostat 9
When is closed, the cooling water passes through the upper tank 11 and is separated into gas and liquid, so that the air bleeding operation can be performed in a short time. In this case, the external shape of the cooling water channel is the same as that shown in FIG. 8, and it is only necessary to add the internal pipe 32 to the existing hose without changing the water channel layout.
It can be realized at low cost. Also, since the internal piping 21 is integrally assembled with the hoses 6 and 31, the upper tank 1
By simply connecting the upper hose 6 to the first mounting port 11a,
One end of the internal pipe 32 protrudes into the upper tank 11 and is easy to assemble.

In the correspondence between the above embodiment and the claims, the upper hose 6 and the lower hose 8 constitute a circulation path, the puddle portion 11b constitutes a swelling part, the upper hose 6 constitutes a feed passage, and the lower hose 8 constitutes a return passage. Respectively.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of a vehicle cooling device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a radiator included in the vehicle cooling device according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of an upper tank included in the vehicle cooling device according to the first embodiment of the present invention.

FIG. 4 is a diagram showing another configuration of a main part of the upper tank constituting the vehicle cooling device according to the embodiment of the present invention.

FIG. 5 is a view showing still another configuration of the main part of the upper tank constituting the vehicle cooling device according to the embodiment of the present invention.

FIG. 6 is a perspective view showing another configuration of the radiator constituting the vehicle cooling device according to the embodiment of the present invention.

FIG. 7 is a side view showing a schematic configuration of a vehicle cooling device according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of a conventional vehicle cooling device.

[Explanation of symbols]

Reference Signs List 1 radiator 3, 31 hose (bypass passage) 4 engine 6 upper hose 8 lower hose 9 thermostat 11 upper tank 11b puddle portion 12 lower tank 32 internal piping

Claims (3)

[Claims] 1. A radiator through which cooling water flows from an upper tank to a lower tank and a first water inlet and a water outlet when the cooling water temperature is higher than a predetermined value, while the cooling water temperature is lower than the predetermined value. When, a thermostat for communicating the second water inlet and the water outlet, and a circulation path is formed so that cooling water flows in the order of the engine, when the temperature of the cooling water flowing out of the engine is lower than the value, In a vehicle cooling device wherein cooling water flows from a bypass passage to the thermostat without being cooled by the radiator, the bypass passage connects the upper tank and a second water inlet of the thermostat. A vehicle cooling device characterized by the above-mentioned. 2. The vehicle cooling device according to claim 1, wherein the upper tank has a bulging portion below a bottom surface thereof, and the bypass passage is connected to the bulging portion. Vehicle cooling device. 3. A radiator through which cooling water flows from the upper tank to the lower tank and a first water inlet and a water outlet when the cooling water temperature is higher than a predetermined value, while the cooling water temperature is lower than the predetermined value. A thermostat for communicating a second water inlet with the water outlet, an engine, a feed-side passage for guiding cooling water flowing out of the engine to the upper tank, and a thermostat for flowing cooling water flowing out of the lower tank. A cooling passage for a vehicle, comprising: a return passage that guides the engine in order; and a bypass passage that branches the cooling water from the feed passage to the thermostat when the temperature of the cooling water flowing out of the engine is lower than the value. In the apparatus, the feeder passage and the bypass passage extend from the upper tank to the bypass passage. Vehicle refrigerator, characterized in that it comprises an internal conduit for.