JPH0452431Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a radiator reserve tank device that adjusts the amount of cooling water in the radiator.

(Prior Art) As this type of reserve tank device for a radiator, there is, for example, one shown in FIG. This radiator reserve tank device includes a reserve tank 1, a water fill cap 2 that is attached to a water fill port 1a on the top of the reserve tank 1 so as to be openable and closable, and a water fill cap that passes through the water fill cap 2 and is fixed to the water fill cap 2. Equipped with breather hose 3. Furthermore, the reserve tank 1 is communicated with an upper tank 6 of the radiator 5 via a reserve hose 4.

In a car equipped with such a radiator reserve tank device, when the cooling water in the radiator 5 becomes high temperature, a part of this cooling water becomes superheated steam, and this superheated steam flows into the reserve tank 1 via the reserve hose 4. do. A part of the superheated steam that has flowed into the reserve tank 1 is discharged to the outside via the breather hose 3.

In addition, when severe driving conditions such as driving with the maximum load, driving with the maximum number of passengers, driving in hot areas, driving at high altitudes, and driving for long periods of time occur, the cooling water in the radiator 5 is rapidly overheated, causing the radiator 5 to overheat. The internal pressure may increase rapidly. In this case, a portion of the superheated steam and cooling water in the radiator 5 rapidly flows into the reserve tank 1 via the reserve hose 4, and the pressure in the reserve tank 1 rapidly increases.

(Problem to be solved by the invention) By the way, the above-mentioned water filling cap 2 can be attached to the water filling port 1a by screw-in type or by screwing the cap 2 into the water filling port 1a.
There is a fitting type in which a convex portion provided at the water inlet 1a fits into a concave portion provided at the water inlet 1a. With this fit-on type, the cap 2 can be easily attached to and detached from the water inlet 1a with a light force, so if the internal pressure in the reserve tank 1 suddenly increases as described above, the cap 2 and the reserve hose 4 will be removed from the reserve. There was a risk of it coming off due to the pressure inside the tank 1, which was not very desirable.

Therefore, this idea was designed to ensure that the pressure inside the reserve tank is discharged to the outside even when such a sudden pressure rise occurs, and that the water injection cap and reserve hose are prevented from coming off from the mounting part due to the rising pressure inside the reserve tank. The object of the present invention is to provide a reserve tank device for a radiator that can be used.

(Means for solving the problem) In order to achieve this purpose, this invention provides a water inlet at the top of a reserve tank for adjusting the amount of cooling water that communicates with the radiator, and a water inlet cap attached to the water inlet. In a radiator reserve tank device that is detachably attached and has a breather hole in either the upper part of the reserve tank or the water filler cap, the water filler cap has an open hole with a larger diameter than the breather hole. an overflow cap that is formed in the reserve tank and is displaced within a predetermined range in the direction of opening the open hole by a sudden increase in pressure in the reserve tank, and is biased in the direction of closing the open hole by its own weight or spring force; The present invention is characterized in that it is a reserve tank device for a radiator that is installed in an open hole.

(Function) According to such a configuration, normally, steam flowing into the reserve tank is discharged to the outside and air is introduced into the reserve tank through the breather hole.

On the other hand, when the pressure inside the reserve tank suddenly increases, the overflow cap is displaced in the direction of opening the open hole against its own weight or spring force, and the open hole is opened. The internal pressure is suddenly released to the outside. and,
When the pressure in the reserve tank decreases, the overflow cap closes the open hole due to its own weight or spring force.

(Example) Hereinafter, an example of this invention will be described based on FIGS. 1 to 9.

<First Embodiment> FIGS. 1 to 4 show a first embodiment of this invention. In FIG. 1, 7 is a radiator of an automobile, and 8 is an upper tank of the radiator. This upper tank 8 is equipped with a reserve tank device 9 according to this invention.

The reserve tank device 9 includes a reserve tank 10 and a water fill cap 11 that opens and closes a water fill port 10a provided at the top of the reserve tank 10. Moreover, a hose connection port 12 is integrally formed in the lower part of the reserve tank 10, and the hose connection port 12 is connected to the upper tank 8 of the radiator 7.
is connected via the reserve hose 14, and the water injection cap 11 described above is connected to the cylindrical portion 11a.
and an upper wall 11b. An annular protrusion 14 for engagement is provided protruding from the inner surface of the cylindrical portion 11a.
When this cylindrical portion 11a is fitted to the outer periphery of the water inlet 10a, the annular protrusion 14 engages with an annular groove (not shown) on the outer circumferential surface of the water inlet 10a, thereby attaching the water inlet cap 11 to the water inlet 10a. It is becoming possible to do this. In the figure, 15 is the water injection cap 11
The tongue-shaped grip part 16 is integrally formed with the cylindrical part 11a of the water filling cap 11, and this hinge part 16 is connected to the reservoir tank 1.
Attached to the top of 0. In addition, 17 is the cylindrical portion 11
This is a breather hole provided in a.

As shown in FIGS. 2 to 4, an open hole 18 is formed in the upper wall 11b of the water injection cap 11, and an overflow cap 19 having a larger diameter than the open hole 18 is concentrically formed on the upper wall 11b. It is located in
Open hole 18 on the underside of this overflow cap 19
A plurality of guide locking legs 20 arranged at equal pitches in the circumferential direction are integrally formed in a portion corresponding to the edge of the guide locking leg 20 . This guide locking leg 20 includes a guide leg portion 20a integrated with the overflow cap 19,
The guide leg portion 20a is formed into a substantially L-shape from a locking portion, that is, a stopper portion 20b provided at the lower end portion of the guide leg portion 20a. Furthermore, the guide locking leg 20a is inserted into the cylindrical portion 11a through the open hole 18. As a result, the overflow cap 19 is displaced within a predetermined range in the direction of opening the open hole 18 (upward in the figure) due to the rapidly rising pressure in the reserve tank 10, and is also urged in the direction of closing the open hole 18 due to its own weight. has been done.

Next, the operation of the radiator reserve tank device having such a configuration will be explained.

According to such a configuration, normally the radiator 7
The venting of steam flowing into the reserve tank 10 through the breather hole 17 and the inflow of air into the reserve tank 10 due to cooling of the radiator 7 are carried out through the breather hole 17.
It is done through.

On the other hand, when the cooling water in the radiator 7 is rapidly overheated and the pressure in the reserve tank 10 rises rapidly, the overflow cap 19 resists its own weight and opens the open hole 18 due to this sudden rise in pressure. By being displaced, the open hole 18 is opened, and the pressure inside the reserve tank 10 is rapidly discharged to the outside.
Then, when the pressure inside the reserve tank 10 decreases, the overflow cap 19 closes the open hole 18 by its own weight.

In the embodiment described above, the overflow cap 19 is urged downward by its own weight to open the open hole 18.
, but it is not necessarily limited to this. For example, a compression coil spring may be interposed between the upper wall 11b of the water injection cap 11 and the stopper portion 20b of the overflow cap 19,
The overflow cap 19 may be biased by a spring in the direction of closing the open hole 18 (downward). In this case, the overflow cap 19 may be damaged due to vibration of the vehicle body, etc.
Since the open hole 18 will not open up and down,
The cooling water in the reserve tank 10 will not spill out from the open hole 18 due to vibrations of the vehicle body or the like.

<Second Embodiment> FIGS. 5 and 6 show a second embodiment of this invention. In this embodiment, a conical flange 21 extending diagonally downward is provided at the peripheral edge of the overflow cap 19 of the first embodiment. According to this embodiment, when the compression inside the reserve tank 10 rises rapidly in the state shown in FIG. 5, the overflow cap 19 is displaced upwardly as shown in FIG. The superheated steam is discharged to the outside from the open hole 18 as indicated by an arrow 22, and the discharged superheated steam is guided downward along the conical flange 21.

According to this embodiment, since the direction of the superheated steam that is rapidly discharged can be changed downward, it is possible to prevent the superheated steam from being blown onto the hood or the like and causing corrosion of the hood or the like.

<Third Embodiment> FIG. 7 shows a third embodiment of this invention. This embodiment is different from the first embodiment in that a recess 23 is provided in the upper wall 11b of the water injection cap 11 and opens to the upper surface 11c, and the above-mentioned open hole 18 is provided concentrically in this recess 23. When the overflow cap 19 is closed, the overflow cap 19 is fitted into the recess 23 and the upper surface 19a of the overflow cap 19 and the upper surface 11
c and are flush with each other.

According to this embodiment, the overflow cap 19 does not protrude above the upper surface 11c of the water injection cap 11, so that the appearance is improved.

<Fourth Embodiment> FIGS. 8 and 9 show a fourth embodiment of this invention. In this embodiment, the open hole 18 is formed in a tapered shape, and an overflow cap 26 consisting of a conical cap body 24 and a retaining ring 25 is provided. The retaining ring 25 has an inner diameter smaller than the upper end of the open hole 18 and an outer diameter larger than the upper end of the open hole 18 . Moreover, this cap body 2
4 includes a guide locking leg consisting of a plurality of guide legs 27 provided on the peripheral edge at equal pitches in the circumferential direction, and a ring-shaped locking portion 28 that integrally connects each guide leg 27. 29 are provided. Further, the retaining ring 25 is fitted into an annular groove 30 provided in the cap body 24.

Such an overflow cap 26 is constructed by inserting the cap body 24 into the open hole 18 from below, and inserting the retaining ring 25 disposed on the upper wall 11b into the annular groove 3.
0, it can be attached to the cap body 24.

In the embodiment described above, the water filling cap 11 is attached to the water filling port 10a by fitting, but the water filling cap 11 may be attached to the water filling port 10a by screwing. Further, although the breather hole 17 is provided in the water filling cap 11, this breather hole 17 may be provided in the overflow cap 19 or the reserve tank 10. Furthermore, the reserve hose 13 is connected to the water injection cap 1.
1 or may be connected to the overflow cap 19. Moreover, the second
In the embodiment, an example is shown in which the flange 21 provided on the overflow cap 19 is formed into a conical shape, but the flange 21 may be a cylindrical body extending downward at right angles to the overflow cap 19.

(Effect of the invention) As explained above, in this invention, an open hole having a diameter larger than the breather hole is formed in the water injection cap, and the open hole is opened by a sudden increase in pressure in the reserve tank. Since the overflow cap is attached to the open hole and is displaced within a predetermined range in the direction and urged in the direction of closing the open hole by its own weight or spring force, the cooling water in the radiator is rapidly overheated. Even if the pressure in the reserve tank suddenly increases due to the superheated steam in the radiator flowing into the reserve tank through the reserve hose, the pressure in the reserve tank is instantly discharged to the outside. It is possible to reliably prevent the water injection cap and reserve hose from coming off from the mounting part due to rising pressure inside the reserve tank.
As a result, it is possible to prevent the water injection cap or reserve hose from coming off from the mounting part and damaging the function of the reserve tank. This will prevent engine failure or damage to other parts due to the water injection cap or reserve hose coming off. can be prevented and safety can be improved.

Furthermore, since large pressure fluctuations within the reserve tank can be eliminated, the wall thickness of the reserve tank can also be reduced.

Moreover, since the overflow cap is installed in the water filling cap, it does not take up much space to install the overflow cap, and the rapidly rising pressure inside the reserve tank can be discharged to the outside without reducing the capacity of the reserve tank. can.

[Brief explanation of the drawing]

Figures 1 to 4 show the first embodiment of the radiator reserve tank device according to this invention. Fig. 3 is a sectional view taken along the - line in Fig. 1, Fig. 4 is a sectional view taken along the - line in Fig. 2, and Fig. 5 is a sectional view taken along the - line in Fig. 2.
6 is a sectional view showing the operating state of the water filling cap shown in FIG. 5; FIG. 7 is a sectional view of the water filling cap showing the third embodiment of the invention; Fig. 8 is a sectional view of a water injection cap showing the fourth embodiment of this invention, and Fig. 9 is a sectional view of the water injection cap showing the fourth embodiment of this invention.
FIG. 10, a sectional view taken along the line - in the figure, is an explanatory diagram of a conventional reserve tank device for a radiator. 7... Radiator, 9... Reserve tank device, 10... Reserve tank, 11... Water injection cap, 13... Reserve hose, 18... Open hole, 19... Overflow cap, 20... Guide locking Leg, 26...Overflow cap, 2
9...Guide locking leg.

Claims (1)

[Scope of Claim for Utility Model Registration] A water inlet is provided at the top of a reserve tank for adjusting the amount of cooling water that communicates with the radiator, and a water inlet cap is removably attached to the water inlet, and the water inlet is connected to the upper part of the reserve tank. In the reserve tank device for a radiator, in which a breather hole is provided on either side of the water filling cap, an open hole having a diameter larger than the breather hole is formed in the water filling cap, and a sudden drop in the reserve tank is formed. An overflow cap is attached to the open hole, and is displaced within a predetermined range in the direction of opening the open hole by rising pressure, and is biased in the direction of closing the open hole by its own weight or spring force. Reserve tank device for radiator.