JPH09151735A - Radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve ability to reflux cooling liquid at overheat time, while ensuring a tank capacity and a radiating area of a core part by limiting a height of a feeler neck part to within a fixed value. SOLUTION: An overflow pipe 47 is formed in a feeler neck 45 of a tank 43. This overflow pipe 47 makes the tank 43 communicate with a reserve tank by means of a reserve hose 49. A sectional shape of a root part 47A to the feeler neck 45 of the overflow pipe 47 is formed in a flat shape spread in a circumferential direction of the feeler neck 45, a sectional area of this shape is large ensured. A cap 60, provided with a regulator valve 70 open/close controlling a flow path to the overflow pipe 47 in accordance with a pressure of cooling liquid in the tank, is mounted in the feeler neck 45. When this regulator valve 70 is opened, the tank 43 and the reserve tank are connected through the flat-shaped root part 47A of large sectional area, so as to improve recirculating ability of cooling liquid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator, and more particularly to a radiator provided with a pressure adjusting mechanism for controlling the pressure of a cooling liquid in a radiator tank to a constant value.

[0002]

2. Description of the Related Art Generally, a radiator 10 for a vehicle is provided with an upper tank 3 above a core portion 1, and a cylindrical feeler neck 5 is formed substantially in the center of the upper tank 3 as shown in FIG. Has been done. An overflow pipe 7 is integrally formed with the feeler neck 5 with resin, and the upper tank 3 and the reserve tank 11 are connected to each other by the overflow pipe 7 and a reserve hose 9 connected to the overflow pipe 7.

A radiator cap 20 is attached to the feeler neck 5. This radiator cap 2
0, depending on the pressure of the cooling liquid in the upper tank 3,
Two types of regulating valves (pressurizing regulating valve 2 in FIG. 9) for controlling the opening / closing of the flow path from the upper tank 3 to the overflow pipe 7 and thereby regulating the pressure in the upper tank 3 are shown.
3, a negative pressure adjusting valve 31) is provided.

FIG. 9 is an enlarged sectional view showing a portion of the feeler neck 5 of the upper tank 3 with the radiator cap 20 attached. Radiator cap 2
0 is composed of a lid 20A and a valve mechanism 20B. Of these, the lid body 20A is provided with a locking claw 20D for locking the radiator cap 20 to the annular mounting portion 5E of the feeler neck 5 on the outer peripheral portion 20C.

Further, a retainer 21 having a spring property is provided on the lid 20A, and a pressing member 21 is arranged along the outer periphery of the retainer 21. The pressing member 21 is brought into contact with the sealing surface 5A of the feeler neck 5 when the cap 20 is attached by the spring property of the retainer 21 to block the inside of the upper tank 3 and the reflux chamber 5C inside the feeler neck 5 from the outside air. To do.

In the figure, reference numeral 23 indicates a pressurizing adjusting valve of the valve mechanism 20B. The pressurizing adjusting valve 23 is attached to a substantially tray-shaped valve plate 25 and the entire lower surface of the valve plate 25. In addition, the pressurizing valve body 27 made of an elastic member such as rubber is sandwiched between the caulking member 32 and the valve plate 25. The pressurizing valve body 27 is pressed against the valve seat 5B formed on the feeler neck 5 side with a predetermined pressure by a compression spring 29 for pressurizing.

In the figure, reference numeral 31 indicates a negative pressure adjusting valve of the valve mechanism 20B. The negative pressure adjusting valve 31 penetrates the center of the pressurizing valve body 27 and also penetrates the through hole 32A of the caulking member 32. A valve rod 35 and a dish-shaped negative pressure valve body 37 attached to the lower end of the valve rod 35 are provided.
The valve rod 35 is surrounded by a bell-shaped guide cylinder 39. The negative pressure valve body 37 is constantly pressed against the pressure valve body 27 by the compression spring 29 for negative pressure.

In the radiator cap 20 constructed as described above, when the pressure in the upper tank 3 becomes equal to or higher than the set pressure, the pressurizing valve body 27 moves upward against the compression spring 29, and the inside of the upper tank 3 is closed. The cooling liquid of the pressurizing valve body 2
7 through the valve seat 5B and the reflux chamber 5C formed in the feeler neck 5, the overflow pipe 7 provided in the feeler neck 5, and the reserve hose 9 so as to flow back to the reserve tank 11 side. There is.

On the other hand, when the pressure in the upper tank 3 becomes a negative pressure below a predetermined value, the negative pressure valve body 37 separates from the pressure valve body 27 against the compression spring 29, whereby the upper tank 3 and the reserve tank 11 are released. Between the overflow pipe 7
The cooling liquid in the reserve tank 11 is prevented from flowing back to the upper tank 3 side, and the inside of the upper tank 3 is prevented from falling below a predetermined value set by the compression spring 33 for negative pressure.

Also, as described above, the radiator cap 2
In the radiator 10 in which the pressure is adjusted by 0, in order to secure the capacity of the upper tank 3 and enlarge the core portion 1 of the radiator to secure the heat radiation area, the height indicated by h1 in FIG. 8 is increased. Therefore, it is necessary to make the height from the upper surface of the upper tank 3 to the upper surface of the cap 20 main body (h2 in FIG. 9) as small as possible.
Therefore, the height (h3) of the feeler neck 5 is also designed to be within a predetermined value (height limit).

[0011]

By the way, it is known that in a radiator, when a water pump (not shown) that circulates a cooling liquid becomes unrotatable, overheating occurs and a large amount of the cooling liquid evaporates at a time. ing. In the conventional radiator, the cooling liquid vaporized during overheating is returned to the reserve tank 11 side via the overflow pipe 7 and the reserve hose 9 by the action of the pressurization adjusting valve 23. In this case, it is desirable to make the cross-sectional area of the flow path (overflow pipe 7, reserve hose 9, etc.) as large as possible. This is because when a large amount of cooling liquid is vaporized at one time, the cooling liquid is efficiently returned to the reserve tank side to prevent the pressure of the vaporized cooling liquid from rising, and each component of the radiator, and further This is to prevent an excessive force from being applied to the engine equipped with the radiator and reduce the possibility of damage.

However, as described above, in the conventional radiator, since the height of the feeler neck 5 is limited, the diameter of the overflow pipe 7 that opens at the portion of the feeler neck 5 cannot be made sufficiently large. By the way,
When the radiator pipe 20 is attached to the overflow pipe 7, a gap is provided so that the locking claw 20D of the cap 20 does not come into contact with the overflow pipe 7 (see FIG. 9).
H4) is ensured and the outer diameter is designed to be the maximum value.

Therefore, the conventional overflow pipe 7
However, as shown in FIGS. 10 to 12, the size of the outer diameter r1 was limited, and it was difficult to efficiently recirculate the cooling liquid during overheating. Further, when the upper tank 3, the feeler neck 5, and the overflow pipe 7 are integrally formed of resin, a taper T occurs on the inner wall surface of the overflow pipe 7 (FIGS. 10 and 12), which causes the pipe 7 The inner diameter r2 of
2 '), the circulation of the cooling liquid is hindered, and the pressure of the cooling liquid easily rises.

The present invention has been made in view of the above circumstances, and the height of the feeler neck portion is limited to within a certain value to secure the upper tank capacity and the heat radiation area of the core portion, and at the same time, the cooling liquid at the time of overheating. It is an object of the present invention to provide a radiator having improved recirculation ability.

[0015]

According to a first aspect of the present invention, a radiator attached to the feeler neck of an upper tank is connected to an overflow pipe integrally formed with the feeler neck of the upper tank via the reserve hose. In the radiator provided with the cap, an adjusting valve for controlling the opening and closing of the flow path to the overflow pipe according to the pressure of the cooling liquid in the upper tank,
The cross-sectional shape of the root portion of the overflow pipe to the feeler neck is flattened in the circumferential direction of the feeler neck.

According to a second aspect of the present invention, the overflow pipe comprises the root portion, a connecting portion having a circular cross section to which the reserve hose is connected, and an intermediate portion connecting the root portion and the connecting portion. The intermediate portion is formed so as to gradually expand in the axial direction of the feeler neck along the axial line of the overflow pipe, as the distance from the feeler neck increases.

According to the third aspect of the present invention, when the radiator cap is mounted, the locking claw formed on the outer peripheral portion of the lid of the radiator cap does not come into contact with the overflow pipe. It is designed to determine the length. In the invention of claim 4, the upper tank, the feeler neck, and the overflow pipe are integrally formed of resin.

(Operation) In the invention of claim 1, since the cross-sectional area of the overflow pipe at the feeler neck can be increased, the area of the flow path of the cooling liquid is increased so that a large amount of the cooling liquid can be temporarily stored. Reflux can be performed. In the invention of claim 2, since the shape of the connecting portion forming the other end of the root portion of the overflow pipe can be made circular, the pipe and the reserve hose can be easily connected. Also, the reflux of the cooling liquid becomes smooth.

In the third aspect of the present invention, if the root portion is sufficiently long, the intermediate portion will not contact the locking claws of the radiator cap. Therefore, the height of the flat cross section of the root portion ( Feeler neck height in the axial direction) can be set high. In the invention of claim 4, since the cross-sectional area of the overflow pipe is sufficiently large even if a taper occurs when the overflow pipe is integrally formed with the feeler neck by the resin,
The increase in pressure of the cooling liquid caused by the area reduction due to the taper is suppressed. Further, the size of the root portion in the feeler neck circumferential direction can be determined in consideration of this area reduction.

[0020]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a feeler neck 4 of a down-flow type radiator 40 of this embodiment.
5 and a partially cut-away sectional view showing the radiator cap 60 attached thereto in an enlarged manner, FIG. 2 is an explanatory view showing the overall configuration of the radiator 40 of this embodiment, and FIG. 3 shows the shape of the feeler neck 45. It is a perspective view.

The feeler neck 45 of this embodiment and an overflow pipe 47 described later are both integrally formed with the upper tank 43 by resin. First, the outline of the pressure adjusting mechanism of the upper tank 43 of the radiator 40 will be described. As shown in FIG. 2, the radiator 4
Upper tank 43 provided above the core unit 41 of 0
A cylindrical feeler neck 45 is formed at substantially the center thereof. Then, the feeler neck 45 is fitted with a radiator cap 60 including a pressure adjusting valve 70 described later.

Further, the feeler neck 45 is provided with a reserve hose 49 at the time of opening the pressurization adjusting valve 70.
An overflow pipe 47 that connects the inside of the upper tank 43 to the reserve tank 51 is provided. Next, a specific configuration of the radiator cap 60 and its operation will be described.

As shown in FIG. 1, the radiator cap 60 according to this embodiment comprises a lid 60A and a valve mechanism 60B. Of these, the lid body 60A has a locking claw 60 for locking the radiator cap 60 to the annular mounting portion 45E of the feeler neck 45 on the outer peripheral portion 60C.
D is provided.

Further, the lid 60A is provided with a retainer 65 having a spring property, and a pressing member 67 is arranged along the outer periphery of the retainer 65. The pressing member 67 is brought into contact with the sealing surface 45A of the feeler neck 45 when the cap 60 is attached by the spring property of the retainer 65, and isolates the reflux chamber 45C of the feeler neck 45 from the outside air.

A connecting member 63 for supporting the retainer 65 is disposed in the center of the lid 60A.
A bell-shaped guide cylinder 69 is integrally fixed to the unit 3.
In the figure, reference numeral 70 indicates a pressurization adjusting valve. The pressurization adjusting valve 70 includes a substantially tray-shaped valve plate 71 and the valve plate 71.
And a pressurizing valve body 75 made of an elastic member such as rubber adhered to the entire lower surface of the valve plate 71.

A spring receiver 77 is arranged between the valve plate 71 and the guide cylinder 69 so as to be slidable in the vertical direction, and a compression spring 79 for pressurization is arranged between the spring receiver 77 and the retainer 65. Has been done. The pressurizing valve body 75 has a sealing surface (valve seat) 45 formed on the feeler neck 45 side.
It is pressed against B at a predetermined pressure.

Further, the radiator cap 60 has
A negative pressure adjusting valve 80 is provided. This negative pressure adjustment valve 80
Includes a valve rod 81 slidably penetrating the center of the pressurizing valve body 75 and a dish-shaped negative pressure valve body 83 attached to the lower end of the valve rod 81. The upper end flange portion 81A of the valve rod 81 is
Between the negative pressure valve body 83 and the caulking member 73, the negative pressure valve body 83 is constantly pressed against the pressurizing valve body 75 to close the flow path between the negative pressure valve body 83 and the pressurizing valve 75. Are arranged.

The radiator cap 60 constructed as described above is used in the upper tank 43 as the volume of the cooling liquid expands.
When the internal pressure exceeds a predetermined value, the pressurizing valve element 75 resists the compression spring 79 of the pressurizing adjusting valve 70 and the valve seat (sealing portion) 45.
The cooling liquid released from B passes through between the pressurizing valve body 75 and the seal portion 45B and passes through the reflux chamber 45C formed in the feeler neck 45, the overflow pipe 47, and the reserve hose 49. , Is returned to the reserve tank 51 side.

On the other hand, when the pressure in the upper tank 43 becomes lower than a predetermined value (negative pressure) due to the volume contraction of the cooling liquid, the negative pressure valve body 83 resists the compression spring 85 of the negative pressure regulating valve 80 and the negative pressure valve body 83 presses. It is released from 75, and by this, the upper tank 43
The valve rod 81 and the caulking member 73 between the reserve tank 51 and the reserve tank 51.
And the opening 69A formed in the guide cylinder 69, the above-mentioned return chamber 45C, the overflow pipe 47, and the reserve hose 49. At this time, the cooling liquid in the reserve tank 51 is the upper tank 43 of the radiator.
The pressure in the upper tank 43 is prevented from falling below a predetermined value set by the compression spring 85 by being returned to the inside.

Next, the shape of the feeler neck 45 will be described in detail with reference to FIGS. 3 to 7. The feeler neck 45 is formed in a cylindrical shape in the upper portion of the upper tank 43, and has a seal surface 45A that abuts the pressing member 67 of the radiator cap 60 and a seal surface (valve that is in pressure contact with the pressurizing valve body 75 of the cap 60). Seat) 45B, an annular mounting portion 4 formed in an annular shape below the sealing surface 45A.
5E (Fig. 3).

The annular mounting portion 45E is provided with two notches 45F and 45F (only one is shown), and
At the counterclockwise position of the cap on the lower back side of the cutouts 45F, 45F, projections 45G, 45G (only one is shown) for limiting the rotating direction of the radiator cap 60.
However, in the clockwise position on the lower back side, the radiator cap 6
The inclined portions 45H, 4 for locking the locking claws 60D, 60D of 0
5H (only one is shown) are formed respectively.

Further, the feeler neck 45 is formed with an overflow pipe 47 whose one end is open at the inner wall surface 45D thereof. This overflow pipe 47
Are approximately three parts, that is, a root portion 47A continuous to the feeler neck 45, a connecting portion 47B connected to the reserve hose 49, and the above-mentioned root portion 47A and the connecting portion 47.
It is composed of an intermediate portion 47C which connects B and B continuously.

Of these, the root portion 47A has a flat cross-sectional shape that spreads in the circumferential direction of the feeler neck 45 (FIG. 5), and its axial length L (FIG. 1, FIG.
In FIG. 4), when the radiator cap 60 is mounted, the locking claw 60D of the radiator cap 60 has a sufficient length so as not to come into contact with the overflow pipe 47.

By forming the root portion 47A into such a shape, the overflow pipe 47 is fitted into the radiator cap 6.
The height of the flat cross section (h5 in FIG. 5) is increased while ensuring the gap h4 so as not to come into contact with the locking claw 60D of 0, and a large area of the flow path of the cooling liquid is secured. You can Further, the connecting portion 47B has a substantially circular cross section (FIG. 6), which facilitates connection with the reserve hose 49.

Further, the intermediate portion 47C is formed so that its cross-sectional shape gradually expands in the axial direction of the feeler neck 45 (the vertical direction in FIG. 3) as it goes away from the feeler neck 45 along its axis ( FIG. 7 shows the shape at the approximate center), and the root portion 47A and the connecting portion 47B are gently continuous. Overflow pipe 47
With such a shape, the feeler neck 4
The cross-sectional area S (FIG. 5) in the feeler neck 45 can be made sufficiently large without increasing 5.

As a result, the upper tank 4 of the radiator
While a large capacity of 3 and a large heat dissipation area of the core portion 41 are secured, a pressure adjusting mechanism capable of efficiently returning a large amount of cooling liquid to the reserve tank 51 side at a time in preparation for overheating is achieved. When the feeler neck 45 is made of resin, a taper (T shown by a broken line in FIG. 4) is generated on the inner wall surface of the feeler neck 45 to reduce the cross-sectional area of the overflow pipe 47. If the cross-sectional area is sufficiently large, this area reduction has less influence on the circulation of the cooling liquid.

If it is desired to eliminate the influence of the taper T, the circumferential length w (FIG. 5) that determines the cross-sectional area of the overflow pipe 47 may be increased by the area reduction due to the taper T. .

As described above in detail, in the radiator 40 of this embodiment, the root portion 47 of the overflow pipe 47 is used.
Since the cross-sectional shape of A is flat, it is possible to increase the cross-sectional area while keeping the height of the feeler neck 45 as it is conventionally. As a result, for example, even if a large amount of cooling liquid is vaporized at one time, the 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. By opening the pressure adjusting valve 70, a flow path having a large opening area is formed, a large amount of the cooling liquid can be refluxed, and a large pressure is not applied to the feeler neck 45 portion, etc. As a result, damage to the engine or the like in which the radiator is mounted can be avoided.

In this embodiment, the downflow type radiator has been described as an example, but the present invention can be applied to other types of radiators (for example, sideflow type radiators). Is. or,
The valve mechanism for adjusting the pressure in the tank of the radiator is not limited to that of this embodiment.
INDUSTRIAL APPLICABILITY 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 according to the pressure fluctuation of the cooling system related to the radiator.

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. In the above-described embodiment, while the height of the feeler neck is kept constant, the shape of the root portion of the overflow pipe is made flat to increase its cross-sectional area. That is, that is, the root portion 47A shown in FIG.
While expanding the circumferential length w of the to flatten it, its height h5
May be lowered to lower the height of the feeler neck itself, thereby reducing the size of the radiator as a whole.

[0041]

As described above in detail, according to the radiator of the present invention, since the cross section of the attachment portion of the overflow pipe to the feeler neck is formed in a flat shape, the height of the feeler neck of the upper tank can be reduced. , The cross-sectional area of the overflow pipe that opens at the feeler neck can be increased as it is, and the cooling liquid recirculates during overheating without reducing the capacity of the upper tank and the heat radiation area of the core in the radiator. It becomes possible to secure a flow path for efficiently performing the above.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view showing a feeler neck 45 of a radiator 40 of the present embodiment and a radiator cap 60 attached to the feeler neck 45 in an enlarged manner.

FIG. 2 is an explanatory diagram showing an overall configuration of a radiator 40 of the present embodiment.

FIG. 3 is a perspective view showing a shape of a feeler neck 45 of the present embodiment.

FIG. 4 is a cross-sectional view showing the shape of a feeler neck 45 of this embodiment.

5 is a cross-sectional view showing the shape of a root portion 47A of the overflow pipe 47 according to the present embodiment, taken along line VV in FIG.

FIG. 6 is an explanatory view showing the shape of the open end (end of the connecting portion 47B) of the overflow pipe 47 of the present embodiment.

7 is a cross-sectional view showing the shape of an intermediate portion 47C of the overflow pipe 47 of the present embodiment, taken along line VII-VII of FIG.

FIG. 8 is an explanatory diagram showing an overall configuration of a conventional radiator 10.

FIG. 9 is a partially cutaway sectional view showing a feeler neck 5 of a conventional radiator 10 and a radiator cap 20 attached to the feeler neck 5 in an enlarged manner.

FIG. 10 is a cross-sectional view showing the shape of a conventional feeler neck 5.

FIG. 11 is an explanatory view showing the shape of an open end of a conventional overflow pipe 7.

FIG. 12 is a sectional view of a conventional neck portion of the overflow pipe 7 with a feeler neck, showing a sectional shape of XII-X in FIG.
FIG. 2 is a sectional view taken along line II.

[Explanation of symbols]

 40 Radiator 43 Upper Tank (Tank) 45 Feeler Neck 47 Overflow Pipe 47A Root 47B Connection 47C Middle 49 Reserve Hose 60 Radiator Cap 60A Lid 60D Locking Claw 70 Control Valve (Pressure Control Valve)

Claims (4)

[Claims] 1. The feeler neck (4) of the tank (43).
Overflow pipe (47) integrally formed with 5)
The reserve tank (51) is communicated with the tank via the reserve hose (49), and the radiator cap (60) attached to the feeler neck (45) is connected to the reserve tank (51) according to the pressure of the cooling liquid in the tank (43). In a radiator (40) provided with a regulating valve (70) for controlling opening and closing of a flow path to the overflow pipe (47), a root portion (47A) of the overflow pipe (47) to a feeler neck (45). The radiator having a flat shape in which the cross-sectional shape thereof extends in the circumferential direction of the feeler neck (45). 2. The overflow pipe (47) is
The root portion (47A), a connecting portion (47B) with a circular cross section to which the reserve hose (49) is connected, and an intermediate portion (47C) that connects the root portion (47A) and the connecting portion (47B). The intermediate portion (47C) is provided with an overflow pipe (4
Along the axis of (7), it is formed so as to gradually expand in the axial direction of the feeler neck (45) as it moves away from the feeler neck (45), and is connected to the connecting portion (47B). The radiator according to item 1. 3. The root cap (47A) is provided with a radiator cap (6) when the radiator cap (60) is mounted.
0) of the lid body (60A) has an engaging claw (60D) formed on the outer peripheral portion (60C) of the overflow pipe (4).
The radiator according to claim 2, wherein its axial length (L) is determined so as not to come into contact with 7). 4. The radiator according to claim 1, wherein the tank (43), the feeler neck (45) and the overflow pipe (47) are integrally formed of resin.