JPH0517375Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a radiator thermal distortion prevention structure for a radiator that cools engine cooling water in a vehicle or the like.

[Conventional technology]

Generally, the piping structure of a normal radiator is
It is configured as shown in the figure. A radiator 5 is installed in front of the engine 6, and the radiator 5 is configured to take in wind from the vehicle. A header tank 7 is arranged above, and a water inlet 20 is provided in the header tank 7.

Of the connecting piping between the radiator 5 and the engine 6,
A water pump 9 is installed in the middle of the outlet rubber hose 3 below, and a thermostat 8 is installed in the middle of the inlet rubber hose 4 above it.

Air generated in the engine 6 and radiator 5 is transferred to the header tank 7 through each air vent pipe 2.
It is configured to be exhausted to The header tank 7 is connected to the water pump 9 through a bypass circuit tube 14, and this tube 14 also functions as a water injection pipe. Arrows indicate the direction of flow of cooling water or air.

A conventional radiator support structure has a structure as described in, for example, Japanese Utility Model Application Publication No. 56-128985. To outline this,
The structure of this radiator consists of an upper and lower tank with multiple positioning protrusions for mounting members on the end face.
After soldering the top and bottom of the core part with fins attached between the liquid pipes, the holes provided on the upper and lower end surfaces of the mounting member engage with the protrusions of the upper and lower tanks, and the mounting members are attached to both sides of the upper and lower tanks. Solder flows into the gap between the protrusion and the hole in the tank, and the joint surfaces of the upper and lower tanks and the mounting member are soldered.

Furthermore, in order to effectively utilize the space in the engine room, a reserve tank is integrated into a radiator core with tanks such as an upper tank and a lower tank. For example, as such,
There is one as disclosed in Publication No. 127192.

To give an overview of this, the structure of this radiator is that a radiator is equipped with a pressure cap on the filler neck part installed in the radiator tank, and a reserve tank with a bracket is installed at a predetermined position. The reserve tank and the overflow pipe provided in the filler neck are connected by a reserve pipe.

[Problem that the invention attempts to solve]

However, as shown in Figure 5 above,
In the structure of a radiator as disclosed in Japanese Patent No. 128985, soldering is performed between the radiator tank and side plate and between the end plate and tube. Generally, with respect to radiators in vehicles, there is a problem of cracks in soldered parts due to thermal strain, which is a problem in the strength of the radiator. This will be discussed with reference to FIGS. 3 and 4.

In FIG. 3, side plates 10 are fixed to both sides of the radiator 5 by soldering, as indicated by reference numeral 15. Radiator 5 has
It has an upper tank 13 and a lower tank 16, and both tanks 13 and 16 are connected by a tube 17. A large number of fins are attached between each tube 17.

FIG. 4 is an enlarged view of the part marked A in FIG.
0 is fixed by soldering or the like as shown by reference numeral 15. The tube 17 is fixed to an end plate 19 constituting the upper tank 13 by soldering or the like, as shown at 18. This crack in the soldered part is caused by the temperature of the tube 17 through which the cooling water heated by heat radiation from the engine, for example cooling water heated to 80°C to 100°C, comes into contact with the wind generated when the vehicle is running. The soldered portion 1 between the side plate 10 and the upper tank 13 is caused by the difference in thermal expansion caused by the temperature difference between the radiator 5 and the side plate 10, which does not rise much.
There is a problem in that thermal stress is applied to the soldered portion 18 between the end plate 19 and the tube 17, which sometimes causes cracks in the soldered portion 18, resulting in water leakage and the like.

In particular, under conditions of low atmospheric temperature, if the vehicle stops in an idling state after driving for a considerable distance, and subsequently starts driving again at full load, the cooling water in the radiator 5 may drain. The temperature rises rapidly, and the temperature of the side plate 10, which has been warmed to a certain extent during the idling state of the engine, is cooled by the air as the air is taken in, and suddenly drops. Therefore, thermal strain between the side plate 10 and the upper tank 13 and lower tank 16 of the radiator 5 becomes even more significant. In FIG. 4, the symbol B is the side plate 1.
0 indicates the direction of contraction, C indicates the direction of expansion of the tube 17, and D indicates the direction of expansion of the wall of the upper tank 13.

Furthermore, in the radiator structure disclosed in the above-mentioned Japanese Utility Model Publication No. 57-127192, the reserve tank is mounted close to the side plate, but the temperature of the cooling water in the reserve tank is approximately The temperature is as low as 60℃ to 70℃. Therefore, even if an attempt is made to increase the temperature of the side plate, the temperature of the side plate cannot be raised to the desired temperature. Therefore, measures are taken to prevent thermal distortion between the side plate and the radiator tank. However, it is still impossible to solve the problem of thermal distortion between the radiator tank and the side plate.

The purpose of this invention is that the temperature of the side plate decreases due to the wind when the vehicle is running, and the difference in thermal expansion caused by the temperature difference between the side plate and the tube and between the side plate and the radiator tank reduces the temperature of the radiator tube. and/or to provide a structure for preventing thermal distortion of a radiator, which is characterized by preventing thermal distortion occurring in a soldered portion between a tank and an end plate, and improving the strength and durability of the radiator.

[Means for solving problems]

In order to achieve the above object, this invention is constructed as follows. That is, this invention consists of a cooling pipe that circulates cooling water between an engine and a radiator that cools the cooling water, air generated in the engine and the radiator is exhausted, and air bubbles contained in the cooling water are removed to form air water. A radiator thermal distortion characterized by having a header tank to be separated, and cooling pipes for passing cooling water from the header tank to the engine, and having any part of each of the cooling pipes attached in contact with a side plate of the radiator. Regarding prevention structure.

In addition, in this radiator thermal distortion prevention structure,
The portion of the cooling pipe that contacts the side plate is a portion that passes cooling water from the head tank to the engine.

Or, in this radiator thermal distortion prevention structure,
The portion of the cooling pipe that contacts the side plate is a portion that circulates cooling water between the engine and the radiator.

In addition, in this radiator thermal distortion prevention structure,
The portion of the cooling pipe that contacts the side plate is formed to have a long hole shape in cross section so that the area of contact with the side plate is large.

[Effect]

Since this invention is constructed as described above, it operates as follows. That is, in the radiator thermal distortion prevention structure according to this invention, the bypass cooling pipe that flows cooling water from the header tank to the engine is attached directly to the side plate of the radiator, in other words, in contact with the side plate of the radiator, and the header tank is attached to the radiator tank. By forcefully circulating the cooling water through the air layer inside the engine, air bubbles contained in the cooling water are removed and air and water are separated. High temperature water, for example about 80℃ to 90℃, flows into the header tank, and the bypass pipe through which this high temperature cooling water flows is directly attached to the radiator side plate, so the temperature of the side plate can be controlled. can be raised. Therefore, it is possible to reduce the temperature difference between the tank and tube of the radiator and the side plate, and it is therefore possible to prevent thermal distortion caused by the difference in thermal expansion in the soldering portions and the like.

〔Example〕

Hereinafter, embodiments of the radiator thermal distortion prevention structure according to this invention will be described in detail with reference to the drawings.

The basic principle of this radiator thermal distortion prevention structure is explained first.
This will be explained with reference to the figures. Regarding the piping structure of the radiator shown in FIG. 1, parts having the same structure as those in FIG. 5 are designated by the same reference numerals, and redundant explanation will be omitted.

In FIG. 1, the cooling pipe 1 that connects the header tank 7 and the water pump 9 is similar to the cooling pipe 14 of the conventional bypass circuit shown in FIG.
Rather than being straight and connected, the cooling pipe 1 is bent and a part thereof is directly fixed and connected to the side plate 10 of the radiator 5. When attaching the cooling pipe 1 to the side plate 10, the cooling pipe 1 is formed in such a shape that the contact area of the portion (portion 11) in contact with the side plate 10 is large.

FIG. 2 shows a radiator 5 and its piping structure to which the radiator thermal strain prevention structure of this invention is applied. This piping structure is different from the conventional radiator piping structure shown in Figure 5.
It can be configured by only changing a part of it. The radiator 5 is arranged in front of the engine 6, and a header tank 7 is arranged above these. An upper tank 13 is provided above the radiator 5, and a lower tank 16 is provided below it.
is provided.

The upper tank 13 and the lower tank 16 are fixed in a predetermined shape by the side plate 10 by soldering (see FIG. 3 or 4) as indicated by reference numeral 15. Upper tank 13 and engine 6
is connected to the inlet rubber hose 4 which is a cooling pipe, and the inlet rubber hose 4
A thermostat 8 is interposed in the middle. The lower tank 16 and the engine 6 are connected by an outlet rubber hose 3 which is a cooling pipe, and a water pump 9 is provided in the middle of the outlet rubber hose 3.

In the cooling piping structure of the radiator 5, cooling water flows in the direction of arrow F. The engine 6 and the upper tank 13 are each provided with an air bleed pipe 2 in order to bleed out gas such as air generated inside the engine 6 and the upper tank 13. A portion of the cooling water flows in the direction of arrow E, and the air contained in the cooling water passes through an air layer within the header tank 7 and is separated from the water.

A cooling pipe or water injection pipe 1 made of a rubber hose that supplies water from a header tank 7 to a water pump 9 is branched and bent in the middle. The branch rubber hose connects each cooling pipe 1 directly attached to the side plates 10 on both sides.
1. The cooling pipe 11 is fixed to the side plate 10 by a bracket 12. However, fixing the cooling pipe 11 to the side plate 10 is not limited to using the bracket 12 as described above.

The radiator thermal distortion prevention structure according to this invention is not necessarily limited to the above configuration. For example, in order to fix the cooling pipe 11 to the side plate 10, instead of using a bracket, the cooling pipe may be provided with a flange portion and fixed using bolts and nuts, or the cooling pipe 11 may be fixed to the side plate 10. Of course, it is also possible to fix directly by welding, brazing, etc. Also, in the above embodiment, cooling piping is used in the bypass circuit from the header tank to the engine, but for the purpose of conducting heat to the side plate, any cooling water system piping that is relatively high can be used. It is something. Furthermore, it is of course possible to apply piping such as a heater hose to the cab. Also,
It is preferable that the cooling pipe 11 attached to the side plate 10 has a long hole-shaped cross section in order to increase the contact area with the side plate 10 in order to improve heat conduction.

[Effect of idea]

Since the radiator thermal distortion prevention structure according to this invention is constructed as described above, it has the following effects. In other words, the cooling piping, which only functions as a flow path for sending cooling water from the header tank to the water pump, or the cooling piping that circulates cooling water between the engine and the radiator, has to be slightly changed. Therefore, a portion of the cooling pipe can be easily attached to the side plate of the radiator in a state of contact.

By bringing the cooling pipe into contact with the radiator side plate, the cooling water in the cooling pipe whose temperature has been raised to a certain degree by the engine can give heat to the radiator side plate, thereby causing the radiator to It is possible to reduce the temperature difference between the upper and lower tanks, the tube of the core part, the end plate, etc., and the side plate, and the difference in thermal expansion between them can be reduced. Therefore, the strength and durability of the radiator can be improved.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the principle of a radiator thermal distortion prevention structure according to an embodiment of this invention, Fig. 2 is a perspective view showing an embodiment of a radiator thermal distortion prevention structure according to this invention, and Fig. 3 is a general view. FIG. 4 is a sectional view showing details of the portion A in FIG. 3, and FIG. 5 is a schematic diagram showing the piping structure of a conventional radiator. 1...Water injection pipe (cooling pipe), 2...Air vent pipe, 3...Outlet rubber hose (cooling pipe), 4...Inlet rubber hose (cooling pipe), 5...Radiator, 6...Engine ,7...
... Head tank, 9 ... Water pump, 10
... Side plate, 11 ... Cooling pipe (cooling piping), 13 ... Upper tank, 15 ... Soldering part, 16 ... Lower tank, 18 ... Soldering part.

Claims (1)

[Claims for Utility Model Registration] (1) Cooling piping that circulates cooling water between the engine and a radiator that cools the cooling water, air generated by the engine and the radiator is exhausted, and air bubbles are contained in the cooling water. The engine is characterized by having a header tank that separates air and water by removing water, and cooling pipes for passing cooling water from the header tank to the engine, and that any part of each of the cooling pipes is attached in contact with a side plate of the radiator. Radiator thermal distortion prevention structure. (2) The radiator thermal strain prevention according to claim 1, wherein the portion of the cooling pipe that contacts the side plate is a portion that passes cooling water from the head tank to the engine. structure. (3) The utility model according to claim 1, wherein the portion of the cooling pipe that contacts the side plate is a portion that circulates cooling water between the engine and the radiator. Radiator heat distortion prevention structure. (4) Utility model registration claim 1, characterized in that the portion of the cooling pipe that contacts the side plate is formed in a long hole shape in cross section so that the contact area with the side plate is large. Radiator thermal distortion prevention structure described in section.