JPH0791252A - Reserve tank - Google Patents

Abstract

PURPOSE:To locally drain cooling water overflowing from a tank body without increasing the cost. CONSTITUTION:An overflow passage 3d is formed in a groove-like shape, in a cap 3 which blocks a filling port 1 of a tank body 2, being recessed outward of a cap body 3a from the inner surface of the latter. This overflow passage 3d is extended, radially of the cap 3, the cap body 3a to the outer peripheral wall 3b of the cap 3, being downward opened on the outside of the outer peripheral part 3b. Accordingly, when the cap 3 is fitted on the filling port 1, the overflow passage 3d on the cap body 3a side, is opened inward from the filling port 1, and the overflow passage 3d on the outer peripheral wall side is opened outside of the filling port 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reserve tank for a radiator mounted on a vehicle.

[0002]

2. Description of the Related Art Conventionally, a vehicle having a water-cooled internal combustion engine is provided with a reserve tank for storing cooling water overflowing from a radiator. Figure 9 shows the reserve tank.
As shown in, an overflow passage 100 for opening the inside of the reserve tank to the atmosphere is provided. The overflow passage 100 is provided, for example, in a cap 120 that closes a water injection port 110 of a reserve tank.

[0003]

However, in the conventional reserve tank, the overflow passage 100 is provided with the cap 12.
In case of resin molding with 0, the overflow passage 100
Since it is hollow, it is necessary to perform die cutting in the overflow passage 100. Therefore, the outlet 101 of the overflow passage 100 is horizontal (see FIG. 9).
Alternatively, it is formed so as to face upward (upward).

Therefore, the conventional reserve tank is used by further connecting the rubber hose 130 (see FIG. 9) to the overflow passage 100 in order to ensure safety. This is because the heated water and steam discharged from the overflow passage 100 reach a high temperature of about 140 ° C. at the maximum, so when the passenger opens the bonnet and is located near the reserve tank, it is discharged from the overflow passage 100. This is to prevent the heated water and steam from hitting the occupants.

Temporarily, the outlet 1 of the overflow passage 100
When 01 is formed so as to face downward (toward the ground), a mold cavity 160 is generated in the overflow passage 100 between the upper mold 140 and the lower mold 150, as shown in FIG. If injection molding is performed in this state, the inside of the overflow passage 100 will be filled with resin. Further, as shown in FIG. 11, by using the slide mold 170, it is possible to form the overflow passage 100 so as to face obliquely downward, but since the overflow passage 100 becomes too large, a weight increase and This will increase costs.

As described above, when the conventional reserve tank is used, the rubber hose 130 is required to ensure the safety, so that there is a problem that the cost is increased. The present invention has been made based on the above circumstances, and an object thereof is to provide a reserve tank capable of discharging cooling water overflowing from a tank body toward the ground without increasing cost. It is in.

[0007]

In order to achieve the above object, the present invention provides a reserve tank comprising a tank main body having a water injection port for injecting cooling water, and a cap for closing the water injection port, The cap is formed in a groove shape from the inner surface of the cap to the outside of the cap to the outer peripheral edge of the cap, and in a state in which the cap closes the water injection port, it opens downward on the outside of the water injection port. The technical means is to have an overflow passage provided by means of which the inside and the outside of the tank body are communicated with each other through the overflow passage.

[0008]

The reserve tank of the present invention having the above structure is
The inside and outside of the tank body communicate with each other through an overflow passage formed on the inner surface of the cap. Therefore, when the internal pressure of the tank body rises, the heated water and steam overflowing from the tank body are discharged to the outside of the tank body through the overflow passage. At this time, since the overflow passage is opened downward (toward the ground) outside the water injection port when the cap closes the water injection port, the heating water and steam overflowing from the tank body through the overflow passage will not flow. , Will be discharged toward the ground. Further, since the overflow passage is not formed in the shape of a hollow pipe but is formed as a groove-like recess on the inner surface of the cap, it can be integrally formed with the cap.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the reserve tank of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of a cap fitted to a water injection port of a reserve tank. The reserve tank of this embodiment includes a tank main body 2 having a water injection port 1 for injecting cooling water, a cap 3 for closing the water injection port 1,
A rubber packing 4 and the like interposed between the water inlet 1 and the cap 3 are provided.

The tank body 2 is made of polypropylene resin and is formed by blow molding. The water injection port 1 has a cylindrical shape and is provided at the center of the upper surface of the tank body 2. The opening end of the water injection port 1 is enlarged in the radial direction to form a fitting portion 1a for fitting the cap 3 therein.

The cap 3 is made of polypropylene resin,
A circular lid 3a for closing the water inlet 1, an annular outer peripheral wall portion 3b extending below the outer peripheral edge of the lid 3a and fitted into the fitting portion 1a of the water inlet 1, a connection pipe 3c, And an overflow passage 3d.

A handle 3e used for attaching and detaching the cap 3 is provided at one location on the outer peripheral edge of the lid 3a (see FIG. 2). A projection 3f directed inward in the radial direction is provided on the entire inner circumference of the tip of the outer peripheral wall 3b (see FIG. 1). The projection 3f may be partially provided instead of the entire circumference. The cap 3 is fitted from above the water inlet 1 downward while press fitting the outer peripheral wall portion 3b into the outer periphery of the fitting portion 1a, and the projection 3f provided on the outer peripheral wall portion 3b is fitted to the fitting portion 1a. It is fixed to the water inlet 1 by being locked at the corners of.

The connection pipe 3c connects a radiator (not shown) and the tank body 2 through an overflow hose (not shown). The connection pipe 3c extends through the central portion of the lid 3a to the outside and inside of the cap 3. It is extended. On the outer side of the cap 3, after being formed upward from the outer surface of the cap 3, it is extended horizontally in the middle of the pipe and an overflow hose is connected. Inside the cap 3, it is formed downward from the inner surface of the cap 3 and a rubber inner hose 5 is connected thereto.

The overflow passage 3d is for discharging the heated water and steam overflowing from the tank body 2 to the outside of the tank, and is a groove in the radial direction of the cap 3 from the inner surface of the lid 3a to the outside of the lid 3a. Is formed in a concave shape (see FIGS. 2 and 3). The overflow passage 3d is provided from the vicinity of the connection pipe 3c of the lid 3a to the outer peripheral wall portion 3b, and is opened downward outside the outer peripheral wall portion 3b. Therefore, when the cap 3 is fitted into the water inlet 1, the lid 3a side of the overflow passage 3d is opened inside the water inlet 1, and the outer peripheral wall 3b side of the overflow passage 3d is opened outside the water inlet 1. It will be. Therefore, the inside and the outside of the tank body 2 are communicated with each other through the overflow passage 3d, that is, the tank body 2 is open to the atmosphere through the overflow passage 3d.

The above-mentioned cap 3 uses the lower die 6, the upper die 7 and the slide die 8 shown in FIGS. 4 and 5 and is injection-molded to cover 3a, outer peripheral wall 3b, connecting pipe 3c and overflow passage. 3d is integrally molded. The upper mold 7
Has a shape in which the connecting pipe 3c formed on the outside of the cap 3 is bent at a right angle on the way, and thus is divided into two parts from the axial center of the connecting pipe 3c (see FIG. 5). Slide type 8
Is used to form a hollow portion of the connecting pipe 3c extending in the horizontal direction. Further, the overflow passage 3d is
Instead of the pipe shape (hollow shape) like the connection pipe 3c,
Since it is formed by denting in a groove shape from the inner surface of the lid body 3a, it is not necessary to use another slide die, and only the upper die 7 and the lower die 6 are connected to the lid body 3a and the outer peripheral wall portion 3b. Can be formed.

The packing 4 is inside the cap 3 (the lid 3
It is press-fitted into the inner surface (a) to close the space between the cap 3 and the water injection port 1 in a liquid-tight manner. As shown in FIG. 6, the packing 4 has a fitting hole 4a that fits into a boss portion 3g (see FIG. 3) formed on the outer circumference of the connection pipe 3c, and a positioning hole provided on the outer circumference of the boss portion 3g. A positioning hole 4b that fits into the protrusion 3h (see FIG. 3) and a communication hole 4c that opens the overflow passage 3d (see FIG. 3) formed in the cap 3 into the tank body 2 are formed.

The positioning hole 4b and the communication hole 4c are formed in pairs on both sides of the fitting hole 4a so as to be connected to the fitting hole 4a. Thereby, when the packing 4 is press-fitted into the cap 3, the packing 4 can be mounted without sticking to the front and back. By mounting the packing 4 inside the cap 3, the overflow passage 3d formed in the cap 3 opens into the tank body 2 through the communication hole 4c formed in the packing 4 (see FIG. 7). Also,
The overflow passage 3d reaching the outer side of the outer peripheral wall 3b is opened to the outer side of the outer peripheral wall 3b without being blocked by the packing 4.

Next, the operation of the reserve tank will be described.
When the temperature of the cooling water rises and the internal pressure of the radiator reaches or exceeds the set pressure, the cooling water in the radiator flows out from the overflow pipe (not shown) of the radiator. This outflowing cooling water is guided to the connection pipe 3c provided in the cap 3 through the overflow hose, and flows from the connection pipe 3c through the inner hose 5 into the tank body 2 of the reserve tank.

Here, the reserve tank has a tank body 2 through an overflow passage 3d formed in the cap 3.
Since the inside and the outside of the tank are communicated with each other, when high-temperature cooling water flows into the tank body 2 and the internal pressure of the reserve tank rises, excess heating water and steam in the tank body 2 may cause the packing 4 Is discharged from the communication hole 4c through the overflow passage 3d to the outside of the tank main body 2 (flows of heating water and steam are shown by solid arrows in FIG. 1). At this time,
Since the overflow passage 3d opens downward (toward the ground) outside the outer peripheral wall portion 3b of the cap 3, the heated water and steam overflowing from the tank body 2 are discharged downward. After that, when the temperature of the cooling water decreases and the internal pressure of the radiator decreases, the cooling water stored in the tank body 2 is sucked up by the inner hose 5 and returned to the radiator through the connection pipe 3c and the overflow hose.

FIG. 8 shows a second embodiment of the present invention. In the first embodiment described above, the cap 3 is attached to the water inlet 1 of the tank body 2.
Although an example of fitting and fixing to FIG.
As shown in, the cap 3 and the water injection port 1 are fixed by screwing.

[0021]

In the reserve tank of the present invention, since the overflow passage formed on the inner surface of the cap opens downward outside the water injection port, it is not necessary to use a separate part such as a rubber hose as in the conventional case. Cooling water that overflows from the tank body can be discharged toward the ground. Further, since the overflow passage is formed in a groove shape from the inner surface of the cap to the outside of the cap, it can be integrally formed with the cap at low cost without using a slide mold or the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a cap fitted to a water injection port of a reserve tank.

FIG. 2 is a plan view seen from above (outside) the cap.

FIG. 3 is a plan view seen from below (inside) a cap.

FIG. 4 is a cross-sectional view of a mold used when injection molding a cap.

5 is a sectional view taken along the line AA of the mold shown in FIG.

FIG. 6 is a plan view of a packing.

FIG. 7 is a plan view showing a state in which packing is mounted in the cap.

FIG. 8 is a cross-sectional view when the cap is screwed to the water inlet (second embodiment).

FIG. 9 is a cross-sectional view of a conventional cap having an overflow passage.

FIG. 10 is a cross-sectional view showing a mold structure for forming an overflow passage.

FIG. 11 is a cross-sectional view showing a mold structure for forming an overflow passage.

[Explanation of symbols]

 1 Water injection port 2 Tank body 3 Cap 3d Overflow passage

Claims (1)

[Claims] 1. A reserve tank comprising a tank main body having a water injection port for injecting cooling water, and a cap for closing the water injection port, wherein the cap has a groove shape extending from an inner surface of the cap to an outer side of the cap. Is formed to the outer peripheral edge of the cap, and has an overflow passage provided downwardly on the outside of the water injection port with the cap closing the water injection port, and through the overflow passage. A reserve tank in which the inside and the outside of the tank body are communicated with each other.