JPH09166021A - Radiator pressure adjusting mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently discharge cooling liquid gasified during overheating to the outside. SOLUTION: In a pressure adjusting mechanism 82, first and second reflux rooms 83D and 83E are formed by a filler neck 83 and a cap 90 formed in a radiator tank 81. Overflowing pipes 86 communicated with the reflux rooms are formed and the radiator tank and a reserve tank are communicated with each other so as to form a first flow passage. A first adjusting valve 100 for controlling the opening/closing of the first flow passage is provided in the radiator cap. The adjusting valve is opened when pressure inside the radiator tank exceeds a first specified value, cooling water is returned from the radiator tank to the reserve tank and pressure inside the tank is set to a specified value. A second flow passage for communicating the reflux rooms with the outside of the radiator tank is formed in the filler neck and a second adjusting valve 110 for opening the second flow passage when pressure inside the tank exceeds a second specified value larger than the first specified value is provided in the cap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator pressure adjusting mechanism.

[0002]

2. Description of the Related Art Conventionally, a radiator is provided with a pressure adjusting mechanism for controlling the pressure in the radiator tank to a predetermined value by circulating the cooling liquid to the reserve tank side according to the pressure value in the radiator tank. ing.

This pressure adjusting mechanism includes a feeler neck formed in a radiator tank, an overflow pipe formed so as to open inside the feeler neck, and a radiator cap equipped with a pressure adjusting valve and a negative pressure adjusting valve. It is configured. Thus, when the pressure of the cooling liquid in the radiator tank becomes equal to or higher than a predetermined value which is larger than the atmospheric pressure, the pressure adjusting valve is opened and the cooling liquid in the radiator tank is returned to the reserve tank side. As a result, the pressure inside the radiator does not exceed the predetermined value.

On the other hand, when the pressure of the cooling liquid becomes a constant negative pressure, the negative pressure adjusting valve is opened so that the cooling liquid in the reserve tank is returned to the radiator tank side.
This prevents the pressure inside the radiator tank from falling below a certain negative pressure. FIG. 14 is an enlarged cross-sectional view showing a main part of a pressure adjusting mechanism 2 formed on an upper portion of a conventional radiator tank 1.

As shown in this figure, the radiator tank 1
A cylindrical feeler neck 3 is formed on the inner surface of the radiator neck 3. A pressing member 7 on the radiator cap 4 side is brought into contact with a sealing surface 3A of the opening of the feeler neck 3. The feeler neck 3 closed by the pressing member 7
A reflux chamber 3C is formed inside. An overflow pipe 5 is formed in the feeler neck 3 so that one end thereof opens at the wall surface 3D. Thus, the reflux chamber 3C formed in the feeler neck 3 is
A reserve tank (not shown) is connected to the reservoir via the overflow pipe 5.

In the figure, reference numeral 10 indicates a pressurization adjusting valve. The pressurization adjusting valve 10 includes a valve plate 11 having a substantially tray shape.
The pressurizing valve body 15 is made of an elastic member such as rubber and is attached to the entire lower surface of the valve plate 11 and is sandwiched by the caulking member 13 from the valve plate 11.

The pressurizing valve body 15 has a feeler neck 3
The valve seat 3B formed on the side is pressed against the valve seat 3B at a predetermined pressure by the adjusting spring 17 for pressurization. In the figure, reference numeral 20
Indicates a negative pressure adjusting valve, and this negative pressure adjusting valve 20 is
A valve rod 21 which penetrates the center of the pressurizing valve body 15 and slidably penetrates the through hole 13A of the caulking member 13.
And a dish-shaped negative pressure valve body 23 attached to the lower end of the valve rod 21. The valve rod 21 is surrounded by a bell-shaped guide cylinder 25.

The negative pressure valve body 23 is constantly in pressure contact with the pressurizing valve body 15 by a negative pressure adjusting spring 27. In the pressure adjusting mechanism 2 configured as described above, when the pressure of the cooling liquid in the radiator tank 1 becomes equal to or higher than the set pressure, the pressurizing valve body 15 moves upward in FIG. 14 against the adjusting spring 17. The cooling liquid in the radiator tank 1 becomes the pressurizing valve body 15
And the valve seat 3B, and is returned to the reserve tank side (not shown) through the reflux chamber 3C, the overflow pipe 5 provided in the feeler neck 3, and the reserve hose (not shown).

On the other hand, when the pressure inside the radiator tank 1 becomes a negative pressure below a predetermined value, the negative pressure valve body 23 causes the adjusting spring 27 to move.
Away from the pressurizing valve body 15, whereby the radiator tank 1 and a reserve tank (not shown) communicate with each other via an overflow pipe 5, and the cooling liquid in the reserve tank is returned to the radiator tank 1 side, Tank 1
The inside is prevented from falling below a predetermined value set by the adjustment spring 27 for negative pressure.

[0010]

By the way, in the radiator, when a water pump (not shown) for circulating the cooling liquid becomes unrotatable, overheating occurs, which may cause a large amount of the cooling liquid to vaporize at one time. .

In the conventional radiator described above, the cooling liquid vaporized at the time of overheating is returned to the reserve tank side (not shown) by the action of the pressurization adjusting valve 10. However, since the pressure adjusting valve 10 originally adjusts the pressure in the radiator tank to a predetermined value in a normal operating state, when a large amount of cooling liquid is vaporized at one time such as during overheating. Cannot recirculate the cooling liquid in the radiator tank 1 to such an extent that the pressure rise of the cooling liquid is suppressed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a radiator pressure adjusting mechanism capable of efficiently discharging a cooling liquid that vaporizes during overheating to the outside of the radiator tank.

[0013]

According to a first aspect of the present invention, a radiator cap is attached to a feeler neck formed in a radiator tank, and a reflux chamber is formed in the feeler neck by the feeler neck and the radiator cap. An overflow pipe is formed in the feeler neck so as to communicate with the reflux chamber, and the reflux chamber and the overflow pipe constitute a first flow path communicating with a radiator tank and a reserve tank. The radiator cap is provided with the first passage. A first adjusting valve for controlling the opening and closing of the flow path is provided, and the pressure in the radiator tank is set to the first
When the temperature exceeds a predetermined value, the first regulating valve is opened to circulate the cooling liquid from the radiator tank to the reserve tank, thereby controlling the pressure in the radiator tank to a predetermined value. In the radiator pressure adjusting mechanism configured as described above, the feeler neck is provided with a second flow path for communicating the reflux chamber with the outside of the radiator tank, and the radiator cap has the pressure in the radiator tank as described above. Second greater than first predetermined value
Is provided with a second regulating valve that opens the second flow path when the above value is exceeded.

According to a second aspect of the present invention, the second adjusting valve includes:
A pressure valve body provided on the radiator cap, a valve seat provided at the open end of the feeler neck, and an adjusting spring for pressing the pressure valve body against the valve seat are provided, and the pressure of the cooling liquid is set to the second value. When the pressure exceeds a predetermined value, the pressurizing valve body is configured to be released from the valve seat. According to a third aspect of the present invention, the feeler neck is configured by a first cylindrical portion whose open end is closed by a radiator cap and a second cylindrical portion surrounded by the first cylindrical portion, and the reflux is provided. The chamber is divided into a first reflux chamber formed within the second cylindrical portion and a second reflux chamber formed between the second cylindrical portion and the first cylindrical portion, In the feeler neck, a first overflow pipe that communicates with the first reflux chamber and a second overflow pipe that communicates with the second reflux chamber are formed, and in the first adjustment valve, The opening / closing of the first flow path between the radiator tank and the first reflux chamber is controlled, and the second adjusting valve is used to control the opening between the first reflux chamber and the second reflux chamber. The opening / closing of the second flow path is controlled.

According to a fourth aspect of the present invention, the cross-sectional shape of the root portion of the second overflow pipe to the feeler neck is a flat shape that spreads in the circumferential direction of the feeler neck.

(Operation) In the invention of claim 1, when the pressure of the cooling liquid in the radiator tank exceeds the second predetermined value, the first adjusting valve and the second adjusting valve are opened. Since the inside of the radiator tank communicates with the outside of the radiator tank through the first flow path and the second flow path, a large amount of cooling liquid can be temporarily discharged to the outside of the radiator tank.

According to the second aspect of the invention, since the second flow path is formed at the joint surface between the feeler neck and the radiator cap, it is only necessary to provide a new regulating valve (second regulating valve) on the radiator cap. That is, it is possible to configure a pressure adjusting mechanism that controls the opening and closing of the second flow path without changing the shape of the feeler neck. In the invention of claim 3, since the first overflow pipe and the second overflow pipe are formed in the feeler neck, a large flow passage for the cooling fluid that connects the radiator tank and the reserve tank is secured, Refrigerant can be efficiently returned to the reserve tank.

According to the fourth aspect of the invention, a large opening at the feeler neck of the second overflow pipe can be secured, and the coolant can be more efficiently recirculated to the reserve tank.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 shows the pressure adjusting mechanism 32 of the first embodiment.
FIG. 3 is a partially cutaway cross-sectional view showing, in an enlarged manner, a feeler neck 33 portion of a radiator provided with and a radiator cap 40 attached thereto. This embodiment corresponds to the invention of claims 1 and 2. First, the outline of the pressure adjusting mechanism 32 of the radiator will be described. As shown in FIG. 1, the resin-made radiator tank 31 is integrally formed with a cylindrical feeler neck 33, while the radiator cap 40 has a first pressurizing control valve 50 and a second pressurizing control valve 50.
The pressure adjusting valve 60 and the negative pressure adjusting valve 70 are provided.

In the feeler neck 33, an overflow pipe 35 for communicating the radiator tank 31 with a reserve tank (both not shown) via a reserve hose, one end of which is opened to an inner wall 33D of the feeler neck 33. It is formed integrally. Thus, the first pressure adjusting valve 50, the second pressure adjusting valve 60, and the negative pressure adjusting valve 7 provided on the radiator cap 40 are provided.
0, an overflow pipe 35 formed in the feeler neck 33, and a reserve hose and a reserve tank (not shown) constitute a radiator pressure adjusting mechanism 32.

The first pressure adjusting valve 50 and the second pressure adjusting valve 50
When the pressurization adjusting valve 60 and the negative pressure adjusting valve 70 are opened and closed according to the pressure in the radiator tank 31, the passage from the radiator tank 31 to the overflow pipe 35 is controlled to be opened and closed, and the inside of the radiator tank 31 is controlled. The cooling liquid flows back to a reserve tank (not shown), or conversely, the cooling liquid flows back from the reserve tank to the radiator tank 31.

Next, the specific constructions and operations of the first and second pressurization adjusting valves 50 and 60 and the negative pressure adjusting valve 70 provided on the radiator cap 40 will be described. The radiator cap 40 includes a lid 40A and a valve mechanism 4
0B and a reflux chamber 33C is formed between the lid 40A and the feeler neck 33.

The first pressurizing control valve 50 of the valve mechanism 40B is
A substantially tray-shaped valve plate 52 supported by the first adjusting spring 51 for pressurization, and a lower surface of the valve plate 52, which is caulked with a caulking member 53, and adhered to the entire lower surface of the valve plate 52. The first pressurizing valve body 54 is made of an elastic member such as rubber. The first adjusting spring 51 is provided in the cup-shaped guide tube 4 supported by the connecting member 41 of the radiator cap 40.
It is connected to the guide cylinder 45 while being surrounded by 5.

When the radiator cap 40 is attached, the first pressurizing valve body 54 is moved by the adjusting spring 51.
Is pressed against the valve seat (sealing surface) 33B formed on the feeler neck 33 side with a predetermined pressure. The valve mechanism 40
The second pressurizing control valve 60 of B is the radiator cap 40.
A disk-shaped valve plate 63 supported by the connecting member 41 arranged in the center of the valve plate 63, and an outer peripheral flange portion 63A of the valve plate 63.
And a second pressurizing valve body 67 made of an elastic member such as rubber and a second pressurizing adjusting spring 69 which will be described later.

Further, the disc-shaped valve plate 63 has a U-shaped annular spring accommodating portion 63B formed in the central portion in the radial direction along the circumference thereof. A second pressurizing adjustment spring 69 is housed between the spring housing portion 63B and the lid 40A, and the second pressurizing valve body 67 is attached to the feeler neck 33 when the radiator cap 40 is attached.
The seal surface (valve seat) 33A formed at the open end of the is contacted with a predetermined pressure. Incidentally, reference numeral 68 in the drawing
Is a pressure receiving member provided for efficiently transmitting the pressure in the return chamber 33C to the flange portion 63A of the valve plate 63.

The second pressurizing control valve 6 thus constructed
0 is normally caused by the action of the second pressurizing adjusting spring 69 housed in the housing portion 63B of the valve plate 63.
3 is pressed to the feeler neck 33 side, the pressurizing valve body 67 is brought into contact with the seal surface 33A, and the reflux chamber 33D of the feeler neck 33 is sealed from the atmosphere side. When the pressure of the cooling liquid exceeds the second predetermined value, the pressure causes the disc-shaped valve plate 63 to
The outer peripheral flange portion 63A side is displaced upward in the drawing around the connecting portion 63C with the connecting member 41.

Further, the negative pressure adjusting valve 70 of the valve mechanism 40B includes a valve rod 71 penetrating the center of the first pressurizing valve body 54, a plate-shaped negative pressure valve body 73 attached to the lower end of the valve rod 71, and The adjusting spring 75 is configured by a negative pressure adjusting spring 75.
Is disposed between the upper end flange portion 71A of the valve rod 71 and the valve plate 52, and the negative pressure valve body 73 is connected to the first pressurization valve body 54.
It is adapted to be constantly in pressure contact with the side to close the flow path of the cooling liquid formed between them.

In the pressure adjusting mechanism 32 of the radiator configured as described above, the pressure in the radiator tank 31 is kept at the first predetermined value (the spring constant of the first pressurizing adjusting spring 51 with the volume expansion of the cooling liquid). (Value corresponding to the above), the first pressurizing valve body 54 is released from the valve seat (sealing surface) 33B against the adjusting spring 51, and the cooling liquid in the radiator tank 31 becomes the first pressurizing valve. It flows back between the body 54 and the sealing surface 33B, and flows back to the reserve tank (not shown) through the return chamber 33C in the feeler neck 33, the overflow pipe 35, and a reserve hose (not shown) (arrow in FIG. 2). The flow path indicated by.

On the other hand, when the pressure in the radiator tank 31 becomes smaller than a predetermined negative pressure due to the volumetric contraction of the cooling liquid, the negative pressure valve body 73 resists the adjusting spring 75 of the negative pressure adjusting valve 70 and the negative pressure valve body 73 becomes the first pressurizing valve. It is released from the body 54, and as a result, the gap between the valve rod 71 and the caulking member 53, the opening 4 formed in the guide cylinder 45, between the radiator tank 31 and the reserve tank (not shown).
5A, the reflux chamber 33C, and the overflow pipe 35 communicate with each other. At this time, the cooling liquid in the reserve tank (not shown) is returned to the radiator tank 31, and the pressure in the radiator tank 31 is prevented from falling below a predetermined value set by the adjusting spring 75 (see FIG. 3). Flow path indicated by arrow).

When the engine equipped with the radiator overheats and the pressure of the coolant rises, when the pressure exceeds the first predetermined value, first,
When the first pressurization adjusting valve 50 described above is opened, the inside of the radiator tank 31 communicates with a reserve tank (not shown) through the reflux chamber 33C, the overflow pipe 35, etc.
High-pressure cooling liquid is returned to the reserve tank.

Further, the pressure of the cooling liquid rises,
When the second predetermined value (the value corresponding to the spring constant of the second pressurizing adjustment spring 69) is exceeded, then the second pressurizing adjustment valve 60 is opened and the seal surface 33 of the feeler neck 33 is opened.
A flow path formed between A and the second pressurizing valve body 67 connects the reflux chamber 33C and the atmosphere side. Thus, a large amount of the cooling liquid, which has become high temperature and high pressure at a time due to overheating, is opened by the opening of the first pressurization control valve 50, and the first flow path (31, 33C, 35, etc.) of the cooling liquid is opened. A second flow path (31, 33) which is recirculated to a reserve tank (not shown) via the valve and is opened by opening the second pressure adjusting valve 60.
C, the sealing surface (valve seat) 33A and the second pressurizing valve body 67 are opened to the atmosphere side.

Accordingly, even if a water pump (not shown) that circulates the cooling liquid in the radiator 40 becomes unrotatable and the engine or the like falls into an overheated state and a large amount of the cooling liquid is vaporized at one time, By opening the first pressurization adjustment valve 50 and the second pressurization adjustment valve 60, the vaporized cooling liquid can be efficiently discharged to the outside of the radiator tank 31, and these flow paths can be discharged at the time of overheating. No extra pressure is applied to the parts, and damage to these parts, and eventually damage to the engine in which the radiator is mounted, can be avoided.

(Second Embodiment) Next, a pressure adjusting mechanism 82 according to a second embodiment of the present invention will be described in detail with reference to FIGS. 5 to 13. FIG. 5 is a partially cutaway sectional view showing the feeler neck 83 of the second embodiment and a radiator cap 90 mounted on the feeler neck 83 in an enlarged manner, and FIG. 6 is a radiator cap 90 and a radiator tank 81 constituting a pressure adjusting mechanism 82. , First and second overflow pipes 8
6, 87 and first and second reserve hoses 88A, 88
B is an explanatory view showing an outline of a connected state, FIG. 7 is an explanatory view showing a connected state of the first and second reserve hoses 88A, 88B and the reserve tank 89, and FIG. 8 is a feeler neck 83 of the second embodiment. 9 is a plan view showing the shape of the second overflow pipe 87, FIG. 9 is an explanatory view showing the shape of the end of the second overflow pipe 87, and FIG. 10 is a root portion 87A of the second overflow pipe 87.
It is sectional drawing which shows the cross-sectional shape of. The second embodiment corresponds to the invention of claims 1, 3, and 4.

First, the outline of the pressure adjusting mechanism 82 will be described. As shown in FIG. 5, a cylindrical feeler neck 83 is integrally formed with the resin radiator tank 81. The radiator cap 90 mounted on the feeler neck 83 has a first pressurization adjusting valve 100, a second pressurization adjusting valve 110, and a negative pressure adjusting valve 120.
Is provided.

By the way, in this second embodiment, as shown in FIGS. 5 and 8, the feeler neck 83 is
The radiator cap 90 includes an outer first cylindrical portion 84 whose opening (sealing surface) 84A is closed, and an inner second cylindrical portion 85 surrounded by the first cylindrical portion 84. There is. Thus, the feeler neck 83 has a first reflux chamber 83D whose return chamber is formed inside the second cylindrical portion 85, the second cylindrical portion 85, and the first cylindrical portion 84. And a second reflux chamber 83E formed between

The feeler neck 83 has the second
The first wall whose one end opens at the inner wall 85D of the cylindrical portion 85
The overflow pipe 86 is integrally formed, and the second overflow pipe 87 having one end opened at the inner wall 84D of the first cylindrical portion 84 is integrally formed. Then, when the first pressure adjusting valve 100 and the negative pressure adjusting valve 120 are opened according to the pressure in the radiator tank 81, the radiator tank 81 is opened.
Is the first reflux chamber 83A and the first overflow pipe 8
The coolant in the radiator tank 81 flows back to the reserve tank 89 by communicating with the reserve tank 89 (see FIG. 6) via 6, or conversely, the coolant flows from the reserve tank 89 to the radiator tank 81. It is like this.

On the other hand, when the second pressure adjusting valve 110 is opened according to the pressure in the radiator tank 31, the flow path to the second overflow pipe 87 is opened and the inside of the radiator tank 81 is opened. The cooling liquid passes through the first reflux chamber 83D, the second reflux chamber 83E, and the second overflow pipe 87, and then the reserve tank 89.
It is supposed to recirculate to.

The first overflow pipe 86 has a reserve tank 89 through a first reserve hose 88A.
And the second overflow pipe 87 is connected to the reserve tank 89 via a second reserve hose 88B.
(Fig. 6). By the way, as shown in FIG. 7, the first reserve hose 88A includes the reserve tank 8A.
The second reserve hose 8 is connected to the first connecting portion 89A formed below the lower line 9 (below the lower line 89L).
8B is above the reserve tank 89 (upper line 8
It is connected to a second connecting portion 89B which is separately formed above 9U). In this way, the second reserve hose 88B
Is connected to the upper connecting portion 89B of the reserve tank 89 by opening the atmosphere formed in the reserve tank 89 without returning a large amount of the coolant that has been vaporized at one time during overheating to the coolant in the reserve tank 89. This is for facilitating the release to the atmosphere side from the portion 89C.

Next, the specific constructions and operations of the first and second pressurization adjusting valves 100 and 110 and the negative pressure adjusting valve 120 provided on the radiator cap 90 will be described. The radiator cap 90 is composed of a lid 90A and a valve mechanism 90B. Radiator cap 9
As shown in FIG. 5, the lid 90A of 0 has a
A connecting member 93 is arranged, and in this connecting member 93,
The valve plate 113 and the cup-shaped guide cylinder 92 are supported.

Further, the radiator cap 90 has locking claws 90D for attaching the radiator cap 90 to the feeler neck 83.
Are provided on the outer periphery thereof. Further, a pressing member 94 is attached to the lid 90A by a metal fitting 91. When the radiator cap 90 is attached, the pressing member 94 is acted by the leaf spring 95 to cause the first cylindrical portion 84 to move.
The inner surface of the first cylindrical portion 84 is cut off from the atmosphere side by being brought into contact with the seal surface 84A at the upper end of the.

The first pressure adjusting valve 10 of the valve mechanism 90B.
0 is a substantially tray-shaped valve plate 102 supported by the first adjusting spring 101 for pressurization, and the lower surface of the valve plate 102 is caulked by the caulking member 103 and is attached to the entire lower surface of the valve plate 102. The first pressurizing valve body 104 is made of elastic material such as rubber. The first adjusting spring 101 is arranged between the guide tube 92 and the valve plate 102 while being surrounded by the cup-shaped guide tube 92 supported by the coupling member 93 of the radiator cap 90. There is. Thus, the first adjusting spring 101 causes the pressurizing valve body 104 to constantly be in pressure contact with the seal surface (valve seat) 83B formed on the feeler neck 83 at a predetermined pressure.

The second pressure adjusting valve 11 of the valve mechanism 90B.
Reference numeral 0 indicates a disc-shaped valve plate 113 supported by the connecting member 93 arranged in the center of the radiator cap 90, and a second disc-shaped valve plate 113 arranged on the outer peripheral flange portion 113A of the valve plate 113.
The pressurizing valve body 117 and the second adjusting spring 119 for pressurizing. Specifically, the disc-shaped valve plate 113 is provided with an annular spring accommodating portion 113B having a U-shaped cross section at a substantially central portion in the radial direction along the circumference thereof.
Then, a second pressurizing adjusting spring 119 is housed between the spring housing portion 113B and the lid 90A of the cap 90, and the disc-shaped valve plate 113 is fitted to the feeler neck 8.
The seal surface 84A formed on the first cylindrical portion 84 of No. 3 is brought into contact with a predetermined pressure. Incidentally, reference numeral 96 in the drawing indicates the pressure in the return chamber 83D efficiently for the valve plate 11 concerned.
3 is a pressure receiving member provided for transmitting to the flange portion 113A.

The negative pressure adjusting valve 120 of the valve mechanism 90B is also used.
Is composed of a valve rod 121 that slidably passes through the center of the first pressurizing valve body 104, a dish-shaped negative pressure valve body 123 attached to the lower end of the valve rod 121, and a negative pressure adjusting spring 125. The adjusting spring 125 constantly presses the negative pressure valve body 123 to the pressurizing valve body 114 between the upper end flange portion 121A of the valve rod 121 and the caulking member 103, and the negative pressure valve body 123 and the first pressurizing valve body 104. The flow path of the cooling liquid between and is closed.

By the way, the inner wall 8 of the first cylindrical portion 84 is
As shown in FIG. 5, the second overflow pipe 87 that opens in 4D has a root portion 87 with the feeler neck 83.
A, a connecting portion 87B connected to the second reserve pipe 88B, and an intermediate portion 87C that connects the root portion 87A and the connecting portion 87B. Of these, the connecting portion 87B has a circular open end so as to facilitate the connection with the second reserve pipe 88B (FIG. 9). On the other hand, the root portion 87A has a cross-sectional shape that is flattened in the circumferential direction of the feeler neck 83 (FIG. 10). By making the root portion 87A have such a shape, the opening area (S) at the feeler neck 83 can be made sufficiently large without raising the feeler neck 83. As a result, it is possible to form a flow path that allows a large amount of cooling liquid to be temporarily returned to the reserve tank 89 in preparation for overheating while ensuring a large capacity of the radiator tank 81 and a large heat radiation area of the core portion (not shown) of the radiator.

In the radiator pressure adjusting mechanism 82 configured as described above, when the pressure in the radiator tank 81 becomes equal to or higher than the first predetermined value due to the volume expansion of the cooling liquid, the first
The first pressurizing valve element 104 is opposed to the first pressurizing adjusting spring 101 of the pressurizing adjusting valve 100 of FIG.
The cooling liquid in the radiator tank 81 is released from the first
Is passed between the pressurizing valve body 104 and the seal surface 83B, and is returned to the reserve tank 89 via the first return chamber 33D in the feeler neck 83, the first overflow pipe 86, and the first reserve hose 88A. (Flow path indicated by arrow in FIG. 11).

On the other hand, when the pressure in the radiator tank 81 becomes smaller than a predetermined negative pressure due to the volume contraction of the cooling liquid, the negative pressure valve body 12 is resisted against the adjusting spring 125 of the negative pressure adjusting valve 120.
3 is released from the first pressurizing valve body 104, so that the space between the radiator tank 81 and the reserve tank 89 is closed by the valve rod 1
21 and the caulking member 103, the opening 92A formed in the guide cylinder 92, the reflux chamber 83C, and the first overflow pipe 86 to communicate with each other. At this time, the cooling liquid in the reserve tank 89 is returned to the radiator tank 81, and the pressure in the radiator tank 81 is prevented from falling below a predetermined value set by the compression spring 125 (indicated by an arrow in FIG. 12). Flow path shown).

When the engine in which the radiator is mounted overheats and the pressure of the cooling liquid in the radiator tank 81 rises, when the pressure exceeds the first predetermined value, first, the above-mentioned operation is performed. First pressure adjusting valve 10
0 is opened, and the inside of the radiator tank 81 is the recirculation chamber 83.
D, communicates with the reserve tank 89 via the first overflow pipe 86 and the like.

Further, the pressure of the cooling liquid rises,
When the second predetermined value is exceeded, the second pressurization adjustment valve 110
Is also opened, a flow path is formed between the seal surface 84A of the first cylindrical portion 84 of the feeler neck 83 and the second pressurizing valve body 117, and the first reflux chamber 83D is the second reflux chamber. 8
Connect to 3E. Thus, a large amount of the cooling liquid, which has become high temperature and high pressure at a time due to overheating, flows into the first flow path of the cooling liquid (the first reflux chamber 83D, which is opened by opening the first pressurization adjusting valve 100). First overflow pipe 8
6, the first reserve pipe 88A) is returned to the reserve tank 89, and the second pressure adjusting valve 110 is also provided.
The second flow path (the first reflux chamber 83
D, the second recirculation chamber 83E, the second overflow pipe 87, and the second reserve hose 88B) to recirculate to the reserve tank 89 (the flow path indicated by the arrow in FIG. 13).
In this case, the cooling liquid sent through the second flow path enters the reserve tank 89 through the second connecting portion 89B formed above the reserve tank 89, and cools the reserve tank 89. Instead of being taken into the liquid, it is directly discharged to the atmosphere side from the atmosphere opening portion 89C.

Therefore, even if a water pump (not shown) that circulates the cooling liquid in the radiator becomes unrotatable and the engine or the like falls into an overheated state and a large amount of the cooling liquid evaporates at one time, By opening the pressurization adjusting valve 100 and the second pressurization adjusting valve 110, the vaporized cooling liquid can be efficiently returned to the reserve tank 89 and discharged to the atmosphere side. Therefore, damage to these parts, and eventually damage to the engine in which the radiator is mounted can be avoided.

As described above, the second overflow pipe 87 has a root 87A with the feeler neck 83.
Since the opening is flat and a large opening area is secured in the above, even if a large amount of the cooling liquid is vaporized at a time as described above, this can be efficiently returned to the reserve tank 89. In the above-described second embodiment, an example in which the vaporized cooling liquid is returned to the reserve tank 89 even during overheating has been described, but it may be discharged to the atmosphere side as in the first embodiment. Good.

In the first and second embodiments described above, the downflow type radiator has been described as an example, but other types of radiators (for example, sideflow type radiators) can also be used in the present invention. Of course, can be applied.

Further, the valve mechanism for adjusting the pressure in the tank of the radiator is not limited to that of the first and second embodiments described above. The point is that pressure fluctuations in the cooling system related to the radiator are essential. Accordingly, the present invention is generally applicable to a radiator provided with a valve mechanism for pressure adjustment in which the inside of the radiator tank can communicate with the reserve tank or the outside air.

In the present embodiment, the radiator in which the upper tank, the feeler neck and the overflow pipe are integrally formed of resin has been described, but the present invention is not limited to this, and the feeler neck and the overflow pipe are integrally formed of aluminum. Alternatively, the present invention can be applied to a radiator formed separately.

[0055]

As described above in detail, according to the radiator pressure adjusting mechanism of the present invention, when the pressure exceeds the first predetermined value, the radiator tank is opened to communicate with the reserve tank. Separately from the pressurization control valve of No. 2, when the second predetermined value larger than the first predetermined value is exceeded, the second opening
Since the second pressure regulating valve that forms the flow path of the radiator is provided in the radiator cap, in the normal operating state of the radiator, the pressure is regulated by the first pressure regulating valve, and the engine equipped with the radiator, etc. In case of falling into an overheat state, the second pressurization adjusting valve is further opened, and a large amount of the cooling liquid that has been vaporized at one time is discharged to the outside of the radiator tank through the second flow path. Therefore, extra pressure is not applied to these flow paths, and damage to these parts, and eventually damage to the engine in which the radiator is mounted, can be avoided.

[Brief description of the drawings]

FIG. 1 is a partially cutaway cross-sectional view showing an enlarged feeler neck and a radiator cap of a radiator including a pressure adjusting mechanism according to a first embodiment.

FIG. 2 is a cross-sectional view of a feeler neck and a radiator cap showing the operation of the first pressurizing control valve and the flow of cooling liquid.

FIG. 3 is a cross-sectional view of a feeler neck and a radiator cap showing the operation of the negative pressure adjusting valve and the flow of cooling liquid.

FIG. 4 is a cross-sectional view of a feeler neck and a radiator cap showing the operation of the first and second pressurizing control valves and the flow of cooling liquid.

FIG. 5 is a partially cutaway sectional view showing a feeler neck of a second embodiment and a radiator cap attached to the feeler neck in an enlarged manner.

FIG. 6 is a radiator cap constituting a pressure adjusting mechanism,
It is explanatory drawing which shows the outline of the connection state of a radiator tank, a 1st, 2nd overflow pipe, and a 1st, 2nd reserve hose.

FIG. 7 is an explanatory diagram showing a connection state between first and second reserve hoses and a reserve tank.

FIG. 8 is a plan view showing the shape of a feeler neck of the second embodiment.

FIG. 9 is an explanatory diagram showing a shape of an end portion of a second overflow pipe.

FIG. 10 is a sectional view showing a sectional shape of a root portion of a second overflow pipe.

FIG. 11 is a cross-sectional view of the feeler neck and the radiator cap showing the operation of the first pressurizing control valve and the flow of the cooling liquid.

FIG. 12 is a cross-sectional view of a feeler neck and a radiator cap showing the operation of the negative pressure adjusting valve and the flow of cooling liquid.

FIG. 13 is a cross-sectional view of the feeler neck and the radiator cap showing the operation of the first and second pressurizing control valves and the flow of the cooling liquid.

FIG. 14 is an enlarged cross-sectional view showing a main part of a pressure adjusting mechanism formed in a conventional radiator tank.

[Explanation of symbols]

 31,81 Radiator tank 33,83 Feeler neck 33A Sealing surface (valve seat) 33C, 83C, 83E Reflux chamber 35,86 (First) overflow pipe 40,90 Radiator cap 50,100 First pressure adjusting valve ( First adjusting valve) 60, 110 Second pressurizing adjusting valve (second adjusting valve) 67 Pressurizing valve body 69 Second adjusting spring for adjusting pressure (adjusting spring) 83D First reflux chamber 83E Second Reflux chamber 84 First cylindrical portion 85 Second cylindrical portion 87 Second overflow pipe 87A Root portion 89 Reserve tank

Claims (4)

[Claims] 1. A radiator cap (40, 90) is attached to a feeler neck (33, 83) formed in a radiator tank (31, 81), and the feeler neck (33, 83) and the radiator cap (40, 90) are attached. ) By the feeler neck (3
3, 83) has a reflux chamber (33C, 83D, 83E) formed therein, and the feeler neck (33, 83) has a reflux chamber (3).
3C, 83D, 83E) is formed with an overflow pipe (35, 86), and the reflux tank (33, 83D, 83E) and the overflow pipe (35, 86) are connected to the radiator tank (3).
1st, 81) and the reserve tank (89)
Of the radiator tank (31, 81), the radiator cap (40, 90) is provided with a first adjusting valve (50, 100) for controlling the opening and closing of the first passage. When the pressure exceeds a first predetermined value, the first regulating valve (50, 1)
00) is opened and the radiator tank (31, 8) is opened.
The radiator pressure adjusting mechanism (32, 81) is configured to circulate the cooling liquid from 1) to the reserve tank (89) and thereby control the pressure in the radiator tank (31, 81) to a predetermined value. 82), the reflux neck (33C, 83D, 83E) is attached to the feeler neck (33, 83) by the radiator tank (3).
A second flow path communicating with the outside of the radiator tank (31, 81) is formed in the radiator cap (40, 90), and the pressure inside the radiator tank (31, 81) is larger than the first predetermined value. A pressure adjusting mechanism for a radiator, characterized in that a second adjusting valve (60, 110) for opening the second flow path is provided when the value becomes equal to or more than a predetermined value. 2. The second adjusting valve (60) comprises a pressurizing valve body (67) provided on a radiator cap (40),
The valve seat (33A) provided at the open end of the feeler neck (33) and the pressurizing valve body (67) are connected to the valve seat (33).
And an adjustment spring (69) that presses against A),
The pressurizing valve body (67) is configured to be released from the valve seat (33A) when the pressure of the cooling liquid exceeds the second predetermined value. Radiator pressure adjustment mechanism. 3. The feeler neck (83) has a first cylindrical portion (84) whose open end is closed by a radiator cap (90) and a second cylindrical portion (84) surrounded by the first cylindrical portion (84). Of the second cylindrical portion (8).
5) a first reflux chamber (83D), and a second reflux chamber (85) formed between the second cylindrical portion (85) and the first cylindrical portion (84). 83E) and the feeler neck (83) has a first overflow pipe (8) communicating with the first reflux chamber (83D).
6) is formed and a second overflow pipe (87) communicating with the second reflux chamber (83E) is formed, and the first regulating valve (100) includes the radiator tank (81) and the radiator tank (81). The opening and closing of the first flow path to and from the first reflux chamber (83D) is controlled, and the second adjustment valve (110) is configured to control the first reflux chamber (8D).
The radiator pressure adjusting mechanism according to claim 1, wherein the opening / closing of the second flow path between the third flow path (3D) and the second reflux chamber (83E) is controlled. 4. The second overflow pipe (8)
7) Root (87A) to the feeler neck (83)
The radiator pressure adjusting mechanism according to claim 3, wherein the sectional shape of the radiator is a flat shape that spreads in the circumferential direction of the feeler neck (83).