JP3348414B2 - Radiator pressure adjustment mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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 returning the coolant to a reserve tank side in accordance with the pressure value in the radiator tank and controlling the pressure in the radiator tank to a predetermined value. ing.

[0003] This pressure adjusting mechanism is constituted by a feeler neck formed in a radiator tank, an overflow pipe formed so as to open inside the feeler neck, and a radiator cap provided with a pressure adjusting valve and a negative pressure adjusting valve. It is configured. Thus, when the pressure of the coolant in the radiator tank becomes equal to or higher than a predetermined value greater than the atmospheric pressure, the pressure regulating valve is opened, and the coolant in the radiator tank is returned to the reserve tank side. This prevents the pressure in the radiator from exceeding the predetermined value.

[0004] On the other hand, when the pressure of the cooling liquid becomes a constant negative pressure, a negative pressure regulating valve is opened, and the cooling liquid in the reserve tank is returned to the radiator tank side.
This prevents the pressure in the radiator tank from dropping below a certain negative pressure. FIG. 14 is an enlarged sectional view showing a main part of a pressure adjusting mechanism 2 formed on the upper part of a conventional radiator tank 1.

[0005] As shown in FIG.
Is formed with a cylindrical feeler neck 3, and a pressing member 7 on the radiator cap 4 side is brought into contact with a sealing surface 3 </ b> A of an 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 of the overflow pipe 5 opens at the wall surface 3D. Thus, the reflux chamber 3C formed in the feeler neck 3 is
Through the overflow pipe 5, it is connected to a reserve tank (not shown).

[0006] In the drawings, reference numeral 10 denotes a pressure adjusting valve. The pressure adjusting valve 10 has a substantially tray-shaped valve plate 11,
A pressure valve body 15 is attached to the entire lower surface of the valve plate 11 and is made of an elastic member such as rubber and held between the valve plate 11 by the caulking member 13.

[0007] The pressurized valve body 15 is provided with a feeler neck 3.
It is pressed against the valve seat 3B formed on the side at a predetermined pressure by an adjusting spring 17 for pressing. In FIG.
Indicates a negative pressure regulating valve, and the negative pressure regulating valve 20
A valve rod 21 that penetrates the center of the pressure valve body 15 and slidably penetrates the through hole 13A of the caulking member 13.
And a plate-shaped negative pressure valve body 23 attached to the lower end of the valve stem 21. The valve stem 21 is surrounded by a bell-shaped guide cylinder 25.

The negative pressure valve 23 is constantly pressed against the pressure valve 15 by an adjusting spring 27 for negative pressure. In the pressure adjusting mechanism 2 configured as described above, when the pressure of the coolant in the radiator tank 1 becomes equal to or higher than the set pressure, the pressurizing valve body 15 moves upward in FIG. The cooling fluid in the radiator tank 1 is
Then, the gas flows back to the reserve tank (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 in the radiator tank 1 becomes a negative pressure equal to or lower than a predetermined value, the negative pressure valve body 23
The radiator tank 1 and the reserve tank (not shown) communicate with each other via the overflow pipe 5 in opposition to the pressure valve body 15, and the coolant in the reserve tank is returned to the radiator tank 1 side. Tank 1
Is prevented from falling below a predetermined value set by the adjusting spring 27 for negative pressure.

[0010]

In a radiator, if a water pump (not shown) for circulating a cooling liquid cannot rotate, overheating occurs, and a large amount of the cooling liquid may be vaporized at a time. .

In the above-mentioned conventional radiator, the cooling liquid vaporized at the time of overheating is returned to the reserve tank side (not shown) by the operation of the pressure adjusting valve 10. However, since the pressure regulating valve 10 originally regulates the pressure in the radiator tank to a predetermined value in a normal operating state, when a large amount of coolant is vaporized at one time such as during overheating, Cannot sufficiently recirculate the coolant so as to suppress the pressure rise of the coolant in the radiator tank 1.

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

[0013]

SUMMARY OF THE INVENTION claims 1 invention, the radiator cap is attached to the filler neck which is formed in the radiator tank, with the feeler neck and the La <br/> di eta cap within said feeler neck reflux chamber is formed, an overflow pipe that communicates with the refluxing chamber to said feeler neck is formed, the first flow path that communicates the said radiator tank and the reserve tank at the refluxing chamber and the overflow pipe is formed,
The radiator cap is provided with a first adjusting valve for controlling the opening and closing of the first flow path. When the pressure in the radiator tank becomes equal to or higher than a first predetermined value, the first adjusting valve is opened. Te performs reflux coolant from the radiator tank to the reserve tank, has, in the pressure adjustment mechanism of the radiator comprising adapted to control the pressure in the radiator <br/> Tatanku to a predetermined value, the the feeler neck, the reflux chamber second flow path communicating to the outside of the radiator tank is formed, and the radiator cap, the pressure is above a first predetermined value greater than the second predetermined value of the radiator tank A second regulating valve for opening the second flow path when the above is reached is provided ,
The adjusting valve of No. 2 is a valve provided on the radiator cap.
A pressure valve element, provided at the open end of the feeler neck
A valve seat, and an adjusting spring that presses the pressurized valve body against the valve seat.
And the pressure of the cooling liquid is equal to the second predetermined pressure.
When the pressure exceeds the value, the pressurized valve element is released from the valve seat.
It is configured so that:

According to a second aspect of the present invention, a radiator tank is formed.
A radiator cap is attached to the formed feeler neck
The above feeler neck and the above radiator cap
A reflux chamber is formed in the feeler neck by the above,
Over that communicates with the reflux chamber with the feeler neck
A flow pipe is formed, and the reflux chamber and the overflow
Radiator tank and reserve tank with low pipe
And a first flow path communicating with the radiator.
A first regulating valve for controlling the opening and closing of the first flow path is provided in the cap.
The pressure in the radiator tank is set to a first predetermined value.
When the value exceeds the value, the first regulating valve is opened,
Cooling from the radiator tank to the reserve tank
Recirculates the liquid, and the pressure in the radiator tank
Of the radiator adapted to control the force to a predetermined value
In the pressure adjusting mechanism, the feeler neck is
A second connecting the reflux chamber to the outside of the radiator tank;
Is formed, and the radiator cap is connected to the radiator cap.
The pressure in the eater tank is greater than the first predetermined value
The second flow path is opened when the value exceeds a second predetermined value.
A second regulating valve is provided to
The open end is closed by the radiator cap
And a first cylindrical portion surrounded by the first cylindrical portion.
A second cylindrical portion, wherein the reflux chamber is provided with the second cylindrical portion.
A first reflux chamber formed in the portion, and the second cylindrical portion;
A second reflux chamber formed between the first cylindrical portion and
And the feeler neck is connected to the first reflux.
A first overflow pipe communicating with the chamber is formed.
And a second overflow communicating with the second reflux chamber.
A first pipe is formed, and the first regulating valve is
The first flow path between the heat tank and the first reflux chamber
The second regulating valve controls the opening and closing of the first recirculation valve.
Opening and closing the second flow path between the first chamber and the second reflux chamber.
It is configured to control .

[0015] The invention of claim 3 is obtained by the cross-sectional shape of the root portion to said feeler neck in the second overflow pipe, a flat shape extending in the circumferential direction of the feeler neck.

(Function) In the first aspect of the present invention, when the pressure of the coolant 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 coolant can be discharged to the outside of the radiator tank at a time.

At this time, in the first aspect of the present invention, the second
Is formed on the joint surface between the feeler neck and the radiator cap, so that only a new regulating valve (second regulating valve) is provided on the radiator cap, that is, without changing the shape of the feeler neck. A pressure adjusting mechanism that controls opening and closing of the second flow path can be configured. In the invention of claim 2 , since the first overflow pipe and the second overflow pipe are formed in the feeler neck, a large flow path of the cooling fluid that communicates the radiator tank and the reserve tank is ensured, Efficient reflux of the coolant to the reserve tank can be performed.

According to the third aspect of the present invention, a large opening at the feeler neck in the second overflow pipe can be ensured, and the coolant can be efficiently returned 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 a pressure adjusting mechanism 32 according to the first embodiment.
FIG. 2 is a partially cutaway sectional view showing, in an enlarged manner, a feeler neck 33 portion of a radiator provided with a radiator and a radiator cap 40 mounted on the feeler neck 33. This embodiment corresponds to the first aspect of the present invention. First, an outline of the radiator pressure adjusting mechanism 32 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 is provided with a first pressure adjusting valve 50 and a second pressure adjusting valve 50. A pressure adjusting valve 60 and a negative pressure adjusting valve 70 are provided.

An overflow pipe 35 for communicating the radiator tank 31 to a reserve tank (both not shown) through a reserve hose is formed at the feeler neck 33, and one end of the overflow pipe 35 opens to the inner wall 33D of the feeler neck 33. So that they are integrally formed. Thus, the first pressure regulating valve 50, the second pressure regulating valve 60, the negative pressure regulating valve 7 provided on the radiator cap 40 are provided.
The pressure adjusting mechanism 32 of the radiator is constituted by an overflow pipe 35 formed in the feeler neck 33, a reserve hose and a reserve tank (not shown).

The first pressure regulating valve 50 and the second
When the pressure adjusting valve 60 and the negative pressure adjusting valve 70 open and close according to the pressure in the radiator tank 31, the flow path from the radiator tank 31 to the overflow pipe 35 is controlled to open and close, and the inside of the radiator tank 31 The coolant flows back to a reserve tank (not shown), and conversely, the coolant returns to the radiator tank 31 from the reserve tank.

Next, the specific structure and operation of the first and second pressure 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 the lid 40A and the valve mechanism 4.
0B, so that a reflux chamber 33C is formed between the lid 40A and the feeler neck 33.

The first pressure adjusting valve 50 of the valve mechanism 40B is
A substantially tray-shaped valve plate 52 supported by a first adjusting spring 51 for pressurization, and a lower surface of the valve plate 52 is caulked by a caulking member 53 and adhered to the entire lower surface of the valve plate 52. A first pressure valve body 54 made of an elastic member such as rubber. In addition, the first adjustment spring 51 is connected to the cup-shaped guide cylinder 4 supported by the coupling member 41 of the radiator cap 40.
5 and is connected to the guide tube 45.

When the radiator cap 40 is mounted, the first pressurizing valve body 54 is
Is pressed against a valve seat (seal surface) 33B formed on the feeler neck 33 side at a predetermined pressure. The valve mechanism 40
The second pressure adjusting valve 60 of B is connected to the radiator cap 40.
A disk-shaped valve plate 63 supported by the coupling member 41 disposed at 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 described later.

The disk-shaped valve plate 63 has a U-shaped annular spring storage portion 63B at its radial center portion along the circumference thereof. Then, a second pressurizing adjustment spring 69 is stored between the spring storing portion 63B and the lid 40A, and when the radiator cap 40 is mounted, the second pressurizing valve body 67 is moved to the feeler neck 33.
Is brought into contact with a sealing surface (valve seat) 33A formed at the opening end of the opening at a predetermined pressure. Incidentally, reference numeral 68 in FIG.
Is a pressure receiving member provided for efficiently transmitting the pressure in the reflux chamber 33C to the flange portion 63A of the valve plate 63.

The second pressure adjusting valve 6 constructed as described above
0 is normally set to the valve plate 6 by the action of the second adjusting spring 69 for pressurization stored in the storage portion 63B of the valve plate 63.
3 is pressed toward the feeler neck 33, the pressurizing valve body 67 abuts on the sealing surface 33A, and the reflux chamber 33D of the feeler neck 33 is sealed from the atmosphere side. When the pressure of the coolant 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 coupling portion 63C with the coupling member 41.

The negative pressure adjusting valve 70 of the valve mechanism 40B includes a valve rod 71 penetrating through the center of the first pressurizing valve element 54, a plate-shaped negative pressure valve element 73 attached to the lower end of the valve rod 71, and The adjusting spring 75 comprises 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 connects the negative pressure valve body 73 to the first pressure valve body 54.
Side, and is always in pressure contact with the side so as to close the flow path of the coolant formed between them.

In the radiator pressure adjusting mechanism 32 configured as described above, the pressure in the radiator tank 31 increases to a first predetermined value (the spring constant of the first pressurizing adjusting spring 51) with the volume expansion of the coolant. Above, the first pressurizing valve element 54 is released from the valve seat (seal surface) 33B against the adjusting spring 51, and the cooling liquid in the radiator tank 31 is released from the first pressurizing valve. The gas is passed between the body 54 and the sealing surface 33B, and is returned to the reserve tank 33C in the feeler neck 33, the overflow pipe 35, and the reserve tank (not shown) through the reserve hose (not shown) (arrow in FIG. 2). Channel indicated by).

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

When the pressure of the coolant rises due to overheating of the engine on which the radiator is mounted and the pressure of the coolant rises, first, when the pressure exceeds the first predetermined value,
The first pressure regulating valve 50 is opened, and the inside of the radiator tank 31 communicates with a reserve tank (not shown) through the reflux chamber 33C, the overflow pipe 35, and the like.
High-pressure coolant is returned to the reserve tank.

Then, the pressure of the cooling liquid further increases,
When the pressure exceeds the second predetermined value (a value corresponding to the spring constant of the second pressure adjusting spring 69), the second pressure adjusting 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 pressure valve body 67 communicates the reflux chamber 33C with the atmosphere. Thus, a large amount of the coolant, which has become high temperature and high pressure at one time due to overheating, flows into the first flow path (31, 33C, 35, etc.) of the coolant which is opened by opening the first pressure regulating valve 50. The second flow path (31, 33) is returned to a reserve tank (not shown) through the
C, which is opened to the atmosphere side via a seal surface (valve seat) 33A and a gap between the second pressurizing valve body 67).

Therefore, even if a water pump (not shown) circulating the coolant in the radiator 40 becomes unrotatable and the engine or the like falls into an overheated state and a large amount of coolant is vaporized at one time, the above-mentioned second pump is not used. By opening the first pressure regulating valve 50 and the second pressure regulating valve 60, the vaporized coolant can be efficiently discharged to the outside of the radiator tank 31. No extra pressure is applied to the radiator, and damage to these parts and, consequently, damage to the engine on 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. FIG. 5 is a partially cutaway cross-sectional view showing, on an enlarged scale, a feeler neck 83 and a radiator cap 90 mounted on the feeler neck 83 according to the second embodiment. FIG. 6 shows a radiator cap 90 and a radiator tank 81 constituting a pressure adjusting mechanism 82. FIG. 7 is an explanatory view schematically showing a connection state between the first and second overflow pipes 86 and 87 and the first and second reserve hoses 88A and 88B. FIG. 7 is a diagram showing first and second reserve hoses 88A and 88B.
FIG. 8 is an explanatory view showing a connection state between the fuel tank and the reserve tank 89.
Is a plan view showing the shape of the feeler neck 83 of the second embodiment, FIG. 9 is an explanatory view showing the shape of the end of the second overflow pipe 87, and FIG. 10 is a view showing the base 87A of the second overflow pipe 87. It is sectional drawing which shows a cross-sectional shape. The second embodiment corresponds to the second and third aspects of the invention.

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

By the way, in the second embodiment, as shown in FIG. 5 and FIG.
The radiator cap 90 includes an outer first cylindrical portion 84 whose opening (seal surface) 84A is closed, and an inner second cylindrical portion 85 surrounded by the first cylindrical portion 84. I have. Thus, the feeler neck 83 has a reflux chamber formed of a first reflux chamber 83D formed inside the second cylindrical section 85, the second cylindrical section 85, and the first cylindrical section 84. And a second recirculation chamber 83E formed between them.

The feeler neck 83 has the second
The first end of which is open at the inner wall 85D of the cylindrical portion 85
Is integrally formed, and a second overflow pipe 87 whose one end is opened at an inner wall 84D of the first cylindrical portion 84 is integrally formed. When each of the first pressure regulating valve 100 and the negative pressure regulating valve 120 is opened according to the pressure in the radiator tank 81, the radiator tank 81
Is the first reflux chamber 83A, the first overflow pipe 8
6, the coolant in the radiator tank 81 is returned to the reserve tank 89 by communicating with the reserve tank 89 (see FIG. 6), and conversely, the coolant is returned from the reserve tank 89 to the radiator tank 81. It has become.

On the other hand, when the second pressure regulating 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 second overflow pipe 87 is opened. The coolant is supplied to the reserve tank 89 via the first reflux chamber 83D, the second reflux chamber 83E, and further through the second overflow pipe 87.
Reflux.

The first overflow pipe 86 is connected to a reserve tank 89 via a first reserve hose 88A.
The second overflow pipe 87 is connected to a reserve tank 89 via a second reserve hose 88B.
(FIG. 6). Incidentally, as shown in FIG. 7, the first reserve hose 88A is connected to the reserve tank 8A.
9 is connected to a first connecting portion 89A formed below the lower line 9L (below the lower line 89L).
8B is located above the reserve tank 89 (upper line 8).
(Above 9U) is connected to a second connecting portion 89B separately formed. Thus, the second reserve hose 88B
Is connected to the connection portion 89B above the reserve tank 89 because the large amount of the coolant temporarily vaporized at the time of overheating is not returned to the coolant in the reserve tank 89, and the atmosphere formed in the reserve tank 89 is opened to the atmosphere. This is for facilitating release to the atmosphere side from the portion 89C.

Next, the specific structure and operation of the first and second pressure 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 includes a lid 90A and a valve mechanism 90B. Radiator cap 9
As shown in FIG. 5, the lid 90A at the center of the
A connecting member 93 is disposed, and the connecting member 93
The valve plate 113 and the cup-shaped guide cylinder 92 are supported.

A locking claw 90D for attaching the radiator cap 90 to the feeler neck 83 is provided on the radiator cap 90.
Is 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 mounted, the pressing member 94 is actuated by the leaf spring 95 to cause the first cylindrical portion 84 to move.
The first cylindrical portion 84 is in contact with the sealing surface 84A at the upper end of the first cylindrical portion 84 to block the inside of the first cylindrical portion 84 from the atmosphere side.

The first pressure regulating valve 10 of the valve mechanism 90B
Reference numeral 0 denotes a substantially tray-shaped valve plate 102 supported by a first adjusting spring 101 for pressurization, and a lower surface of the valve plate 102 is caulked by a caulking member 103 and is attached to the entire lower surface of the valve plate 102. A first pressure valve body 104 made of an elastic member such as rubber and the like. The first adjustment spring 101 is disposed between the guide tube 92 and the valve plate 102 while being surrounded by a cup-shaped guide tube 92 supported by the coupling member 93 of the radiator cap 90. I have. Thus, the pressurizing valve body 104 is constantly pressed against the seal surface (valve seat) 83B formed on the feeler neck 83 at a predetermined pressure by the first adjusting spring 101.

The second pressure adjusting valve 11 of the valve mechanism 90B
Reference numeral 0 denotes a disc-shaped valve plate 113 supported by the coupling member 93 disposed at the center of the radiator cap 90, and a second valve plate 113A disposed on an outer peripheral flange portion 113A of the valve plate 113.
And a second pressure adjusting spring 119. Specifically, the disc-shaped valve plate 113 is formed with a U-shaped annular spring housing 113B at a substantially central portion in the radial direction along the circumference thereof.
A second adjusting spring 119 for pressurization is housed between the spring housing 113B and the lid 90A of the cap 90, and the disc-shaped valve plate 113 is moved to the feeler neck 8
The third first cylindrical portion 84 is brought into contact with a sealing surface 84A at a predetermined pressure. In the figure, reference numeral 96 indicates the pressure in the recirculation chamber 83D efficiently.
3 is a pressure receiving member provided to transmit to the flange portion 113A.

The negative pressure adjusting valve 120 of the valve mechanism 90B
Is constituted by a valve rod 121 slidably penetrating the center of the first pressure valve element 104, a dish-shaped negative pressure valve element 123 attached to a lower end of the valve rod 121, and an adjustment spring 125 for negative pressure. The adjustment 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 thereby the negative pressure valve body 123 and the first pressurizing valve body 104. To close the flow path of the coolant.

The inner wall 8 of the first cylindrical portion 84
As shown in FIG. 5, the second overflow pipe 87 opening in 4D has a root 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. The open end of the connecting portion 87B is circular in order to facilitate connection with the second reserve pipe 88B (FIG. 9). On the other hand, the root portion 87A has a flat cross-sectional shape that extends in the circumferential direction of the feeler neck 83 (FIG. 10). By forming the base portion 87A in such a shape, the opening area (S) of the feeler neck 83 can be sufficiently increased without increasing the feeler neck 83. As a result, it is possible to secure a large capacity of the radiator tank 81 and a large heat radiation area of a core portion (not shown) of the radiator, and to form a flow path in which a large amount of the coolant can be returned to the reserve tank 89 at a time in preparation for overheating.

In the radiator pressure adjusting mechanism 82 configured as described above, when the pressure in the radiator tank 81 exceeds a first predetermined value due to the volume expansion of the cooling liquid, the first
The first pressurizing valve body 104 has a valve seat (seal surface) 83B against the first pressurizing adjusting spring 101 of the pressurizing adjusting valve 100 of FIG.
From the radiator tank 81,
Is returned to the reserve tank 89 through the first reflux chamber 33D in the feeler neck 83, the first overflow pipe 86, and the first reserve hose 88A, passing between the pressure valve body 104 and the sealing surface 83B. (The flow path indicated by the 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 coolant, the negative pressure valve body 12 resists the adjusting spring 125 of the negative pressure adjusting valve 120.
3 is released from the first pressurizing valve body 104, whereby the space between the radiator tank 81 and the reserve tank 89 is reduced by the valve stem 1.
The space is communicated with the gap between the caulking member 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. At this time, the coolant in the reserve tank 89 is recirculated into 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 (see the arrow in FIG. 12). Channel shown).

When the pressure of the coolant in the radiator tank 81 rises due to overheating of the engine on which the radiator is mounted and the pressure exceeds the first predetermined value, first, the above-described operation is performed. First pressure regulating valve 10
0 is opened, and the inside of the radiator tank 81
D, which communicates with the reserve tank 89 via the first overflow pipe 86 and the like.

Further, the pressure of the cooling liquid further increases,
When the pressure exceeds the second predetermined value, the second pressure regulating valve 110
Is also opened, and 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, so that the first reflux chamber 83D becomes the second reflux chamber. 8
Communicate with 3E. Thus, a large amount of the coolant, which has become high temperature and high pressure at one time due to overheating, is supplied to the first flow path (the first reflux chamber 83D, 83C) of the coolant which is opened by opening the first pressure regulating valve 100. First overflow pipe 8
6, while being returned to the reserve tank 89 through the first reserve pipe 88A), the second pressure regulating valve 110
Of the second flow path (first reflux chamber 83
D, the second reflux chamber 83E, the second overflow pipe 87, and the second reserve hose 88B) return 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 from the second connection portion 89B formed above the reserve tank 89, and cools the inside of the reserve tank 89. Without being taken into the liquid, it is discharged to the atmosphere side from the atmosphere opening portion 89C as it is.

Therefore, even if a water pump (not shown) which circulates the coolant in the radiator becomes unrotatable and the engine or the like falls into an overheated state and a large amount of coolant evaporates at one time, the first pump is used. By opening the pressure control valve 100 and the second pressure control valve 110, the vaporized coolant can be efficiently returned to the reserve tank 89 and discharged to the atmosphere side, and extra flow is provided to these flow paths during overheating. Such pressure is not applied, and damage to these parts, and eventually damage to the engine or the like on which the radiator is mounted can be avoided.

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

In the first and second embodiments described above, an example of a down flow type radiator has been described. However, other types of radiators (for example, side flow type radiators) are also applicable to the present invention. Can of course be applied.

Further, the valve mechanism for adjusting the pressure in the radiator tank is not limited to those of the first and second embodiments described above. The point is that the valve mechanism adjusts the pressure fluctuation of the cooling system related to the radiator. Accordingly, the present invention can be generally applied to a radiator having a pressure adjusting valve mechanism configured such that the inside of the radiator tank can communicate with a reserve tank or outside air.

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

[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 is opened to communicate the radiator tank with the reserve tank. Separately from the pressure regulating valve of the first embodiment, when the pressure exceeds a second predetermined value larger than the first predetermined value,
Is provided in the radiator cap, the pressure is adjusted by the first pressure adjusting valve in a normal operating state of the radiator, and the engine or the like equipped with the radiator is mounted. In the case of the overheating state, the second pressure regulating valve is further opened, and the temporarily and a large amount of the vaporized coolant is discharged to the outside of the radiator tank via the second flow path. As a result, no excessive pressure is applied to these flow paths, and damage to these parts, and eventually damage to the engine or the like on which the radiator is mounted, can be avoided.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a feeler neck and a radiator cap showing an operation of a first pressure regulating valve and a flow of a coolant.

FIG. 3 is a sectional view of a feeler neck and a radiator cap showing an operation of a negative pressure regulating valve and a flow of a coolant.

FIG. 4 is a sectional view of a feeler neck and a radiator cap showing an operation of a first and a second pressure regulating valve and a flow of a coolant.

FIG. 5 is a partially cutaway cross-sectional view showing an enlarged feeler neck and a radiator cap attached to the feeler neck according to the second embodiment.

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 according to the second embodiment.

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

FIG. 10 is a cross-sectional view showing a cross-sectional shape of a base portion of a second overflow pipe.

FIG. 11 is a sectional view of a feeler neck and a radiator cap showing an operation of a first pressure regulating valve and a flow of a coolant.

FIG. 12 is a sectional view of a feeler neck and a radiator cap showing an operation of a negative pressure regulating valve and a flow of a coolant.

FIG. 13 is a cross-sectional view of the feeler neck and the radiator cap showing the operation of the first and second pressure regulating valves and the flow of the coolant.

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 Seal surface (valve seat) 33C, 83C, 83E Recirculation chamber 35, 86 (First) overflow pipe 40, 90 Radiator cap 50, 100 First pressurizing valve ( First pressure regulating valve) 60, 110 Second pressure regulating valve (second regulating valve) 67 Pressure valve body 69 Second pressure regulating spring (adjusting spring) 83D First recirculation chamber 83E Second Reflux chamber 84 First cylindrical part 85 Second cylindrical part 87 Second overflow pipe 87A Root 89 Reserve tank

Claims (3)

(57) [Claims] A radiator cap ( 4 ) is attached to a feeler neck ( 33 ) formed in a radiator tank ( 31 ).
0) is mounted, said feeler neck (33) and the refluxing chamber to the feeler neck (33) in the above radiator cap (40) (33C) are formed, the refluxing chamber to said feeler neck (33) (33C)
Overflow pipe communicating (35) is formed in said reflux chamber (33C) and the overflow pipe (3
5) a first flow path that communicates the reservoir tank (89) and the radiator tank (31) is constituted by a first adjustment for opening and closing controls the first flow path to the radiator cap (40) A valve (50) is provided, and when the pressure in the radiator tank ( 31 ) becomes equal to or higher than a first predetermined value, the first regulating valve ( 50 ) is opened and the radiator tank ( 31 ) is opened. the perform reflux coolant into the reserve tank (89), have been, the <br/> radiator tank (31) in the pressure so as to control to a predetermined value and becomes radiator of the pressure adjustment mechanism (32)
In, on the feeler neck (33), said reflux chamber (33
Second flow passage for a C) communicates with the outside of the radiator tank (31) is formed, on the radiator cap (40), pressure in the radiator tank (31) within the first is greater than the first predetermined value A second regulating valve ( 60 ) for opening the second flow path when the pressure exceeds a predetermined value of 2. The second regulating valve ( 60 ) is provided with the radiator cap.
(40) and the pressurizing valve body (67)
A valve seat (33) provided at the open end of the collar neck (33)
A) and the pressurized valve body (67) is attached to the valve seat (33A).
An adjusting spring (69) for pressing, when the pressure of the cooling liquid exceeds the second predetermined value,
The pressurized valve body (67) is released from the valve seat (33A).
The pressure adjustment mechanism of the radiator, characterized in that it is configured to so that. 2. A radiator tank formed in a radiator tank.
Radiator cap (9) on feeler neck (83)
0) is attached, and the feeler neck (83) and the radiator cap are mounted.
(90) into the feeler neck (83)
A reflux chamber (83D, 83E) is formed, and the reflux chamber (83D, 83E) is formed in the feeler neck (83).
83E) is in the form of an overflow pipe (86)
And the reflux chamber (83D, 83E) and the overflow
The radiator tank (81) and the reservoir
The first flow path communicating with the pressure tank (89) is configured.
Is, the first flow path open to the radiator cap (90)
A first regulating valve (100) for closing control is provided , and the pressure in the radiator tank (81) is set to a first predetermined value.
When the above occurs, the first regulating valve (100) is opened.
The reservoir from the radiator tank (81).
Reflux the coolant to the tank (89),
Control the pressure in the radiator tank (81) to a predetermined value
Radiator pressure adjusting mechanism (8
In 2), the reflux chamber (83) is connected to the feeler neck (83).
D, 83E) outside the radiator tank (81).
A second flow path communicating with the radiator cap (90) is formed in the radiator cap (90).
The pressure in the tank (81) is larger than the first predetermined value.
The second flow path is opened when the predetermined flow rate exceeds a predetermined value of 2.
A second regulating valve (110) is provided, and the feeler neck (83) is connected to the radiator cap.
First cylindrical portion whose open end is closed by a top (90)
(84) and the first cylindrical portion (84).
A refluxing chamber (83D, 83E) is provided in the second cylindrical portion (85).
A first reflux chamber (83D) formed in (85);
The second cylindrical portion (85) and the first cylindrical portion (84)
And a second reflux chamber (83E) formed between
It is, above feeler neck (83), the first reflux chamber
(83D) and the first overflow pipe (8
6) is formed and in the second reflux chamber ( 83E).
A communicating second overflow pipe (87) is formed.
Is, the first control valve (100), said radiator tank
(81) and the first recirculation chamber (83D).
The second regulating valve (110) controls the opening and closing of the first flow path, and the first recirculation chamber (8)
3D) and the second recirculation chamber (83E).
A pressure adjusting mechanism for a radiator , which controls opening and closing of a flow path of the radiator . 3. The second overflow pipe (8)
7) Root to the feeler neck (83)
(87A) has a cross-sectional shape of the feeler neck (8).
3. The pressure adjusting mechanism for a radiator according to claim 2 , wherein the pressure adjusting mechanism has a flat shape that extends in the circumferential direction of 3) .