JPH09100719A - Cap sealing structure of reserve tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate blow molding work for a tank main body using a resin by providing a flat liquid injecting port opened in the upper wall of the tank main body and a rubber spigot in the flat liquid injecting port so as to hermetically seal the port and simplifying the structure of the tank main body. SOLUTION: A flat liquid injecting port 8 is opened in the upper wall 7a of a tank main body 7 so as to penetrate its thickness and tightly sealed by fitting a rubber spigot 9 in the port 8. This rubber spigot 9 is gradually tapered toward the inside of the tank main body 7 and a plurality of annular projections 10 tightly contacted to the inner circumferential surface of the flat liquid injecting port 8 are provided in the outer peripheral surface of the tapered part. Thus, blow molding work for the tank main body 7 using a resin is facilitated by simplifying the structure of the tank main body 7 and even when a change occurs in wall thickness because of blow molding, the flat liquid injecting port 8 is surely sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap seal structure for a reserve tank installed in a vehicle or the like.

[0002]

2. Description of the Related Art Cooling liquid (radiator liquid) is used for automobiles and the like.
A reserve tank for the engine is provided, and the reserve tank contains a coolant for supplying the coolant to the engine to cool the engine. The coolant (steam) heated to cool the engine. Is cooled by the radiator and returned to the reserve tank again.

FIG. 8 shows an example of a conventional reserve tank. In the conventional reserve tank, a liquid injection port 3 having a filler neck flange 2 for injecting a cooling liquid 1 has a tank body 4 of which The tank main body 4 integrally formed on the upper portion and having the filler neck flange 2 is formed by integral blow molding (principle of inflating a balloon inside the mold) with a resin material.

A cap 5 adapted to hermetically seal the liquid injection port 3 is attached to the liquid injection port 3 formed by the filler neck flange 2. In the figure, 6 indicates a liquid supply pipe which also serves as an air inlet / outlet port.

[0005]

However, in the conventional reserve tank shown in FIG. 8, the liquid injection port 3 is formed integrally with the filler neck flange 2 on the upper part of the tank body 4. In addition, there has been a problem that it is difficult to perform integral blow molding with a resin, and the manufacturing cost increases.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a cap seal structure for a reserve tank which has a simple shape and which can reduce the manufacturing cost.

[0007]

The cap sealing structure for a reserve tank according to the present invention comprises a flat liquid injection port opened on the upper wall of the tank body, and a rubber stopper capable of sealing the flat liquid injection port. It is characterized by.

Further, the rubber stopper fitted to the flat liquid injection port has a taper shape which is tapered toward the inside of the upper wall of the tank body, and the inner peripheral surface of the flat liquid injection port is formed on the outer peripheral surface of the taper shape. It is characterized in that it is provided with a plurality of stages of annular projections that are in close contact with.

Further, on the outer peripheral surface of the rubber stopper fitted to the flat liquid injection port, there is provided a projecting ridge portion annularly protruding with a space smaller than the wall thickness of the flat liquid injection port portion on the upper wall of the tank body. The one of the protrusions constitutes an elastic lip portion.

Further, the rubber stopper is a lower rubber stopper having a lower protrusion on the outer peripheral surface which fits into the flat liquid injection port on the upper wall of the tank body, and a lower fixing seat integrally provided inside the lower rubber stopper. An upper rubber stopper having a tightening portion that fits around the upper periphery of the lower rubber stopper, an upper fixed seat integrally provided on the upper portion of the upper rubber stopper, and rotatably attached to the upper fixed seat. Moreover, the lower end is screwed into the lower fixed seat, and the rotation adjusts the distance between the lower fixed seat and the upper fixed seat to adjust the wall thickness between the lower protruding portion and the tightening portion in the vicinity of the flat injection port. And an adjusting screw which can be tightened in the direction.

In the present invention, the flat liquid injection port is opened on the upper wall of the tank main body, and the flat liquid injection port is sealed by the rubber stopper. Therefore, the structure of the tank main body is simplified and the tank main body is made of resin. Blow molding work can be facilitated.

A rubber plug fitted into the flat liquid injection port is tapered toward the inside of the tank body, and an annular shape is attached to the outer peripheral surface of the taper shape and closely adheres to the inner peripheral surface of the flat liquid injection port. When the protrusion is provided in a plurality of stages, the flat liquid injection port can be hermetically sealed with a rubber stopper having a simple shape.

On the outer peripheral surface of the rubber stopper fitted to the flat liquid injection port, there are formed protrusions annularly protruding with a space smaller than the wall thickness of the flat liquid injection port on the upper wall of the tank body, and If one of the ridges is the elastic lip, it has the effect of sandwiching the vicinity of the flat injection port in the thickness direction between the ridges and tightening with the elastic lip. Even if the wall thickness changes, the flat opening can be hermetically sealed.

A lower rubber stopper having a lower protrusion on the outer peripheral surface which is fitted to a flat liquid injection port on the upper wall of the tank body;
A lower fixing seat integrally provided inside the lower rubber stopper, an upper rubber stopper having a tightening portion fitted to an upper outer periphery of the lower rubber stopper, and an upper portion integrally provided at an upper portion of the upper rubber stopper. It is rotatably attached to the fixed seat and the upper fixed seat, and the lower end is screwed into the lower fixed seat, and the distance between the lower fixed seat and the upper fixed seat is adjusted by rotation to tighten the lower protruding portion. With a configuration including an adjusting screw capable of tightening the vicinity of the flat liquid injection port in the thickness direction with the section, by rotating the adjusting screw to adjust the distance between the lower fixed seat and the upper fixed seat. , The force for tightening the vicinity of the flat liquid injection port in the wall thickness direction between the lower protrusion and the tightening part can be adjusted arbitrarily,
Therefore, more reliable sealing can be performed.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an embodiment of the present invention. The tank main body 7 upper wall 7a is penetrated through a thickness of the tank main body 7 upper wall 7a (as shown in FIG. 3). ) Is opened, and the tank main body 7 having the flat liquid injection port 8 formed therein can be easily manufactured by blow molding with a resin.

FIGS. 2 and 3 show an example of the form of the rubber stopper 9 which is fitted in the flat liquid injection port 8 and hermetically sealed. The rubber stopper 9 is provided in the tank body 7. The taper shape has a taper shape that is tapered toward the outside, and a plurality of annular projections 10 that are in close contact with the inner peripheral surface of the flat liquid injection port 8 are provided on the outer peripheral surface of the tapered shape. Reference numeral 11 in FIG. 2 denotes an insertion hole formed in the upper center part of the rubber plug 9.
As shown in FIG. 3, the rubber stopper 9 is pushed into 1 to expand the rubber stopper 9 as shown by the arrow so that the rubber stopper 9 does not come out from the flat liquid injection port 8.

According to the example of the rubber stopper 9 shown in FIGS. 2 and 3, the flat liquid injection port 8 can be hermetically sealed by the rubber stopper 9 having a simple shape.

FIG. 4 and FIG. 5 show another example of the rubber stopper, in which the flat liquid injection of the upper wall 7a of the tank body 7 is performed on the outer peripheral surface of the rubber stopper 13 fitted into the flat liquid injection port 8. One of the protrusions 14 and 15 is formed by forming protrusions 14 and 15 protruding annularly with a distance t smaller than the wall thickness T near the mouth 8.
In FIGS. 4 and 5, the lower protrusion 15 is used as the elastic lip 16. In the illustrated elastic lip portion 16, the thickness on the base side is thicker and the thickness on the tip side is gradually reduced, and the upper ridge portion 1 is formed.
It has a curved shape on the 4 side. In the case shown,
The upper protruding portion 14 is formed by a step portion which is thinner than the upper thick portion 17.

Further, FIG. 6 shows that the elastic lip portion 16 is formed by making a notch 18 in the lower end step of the upper thick portion 17 forming the upper protruding portion 14 of the protruding portions 14 and 15. The case where the elastic lip 16 is formed is shown. In the case shown, the hollow portion 19 is formed inside the elastic lip portion 16.
If the elasticity of the elastic lip portion 16 can be sufficiently secured, the hollow portion 19 may not be provided.

According to the embodiment of the rubber stopper 13 shown in FIGS. 4, 5 and 6, the thickness of the flat injection port 8 of the upper wall 7a of the tank body 7 is formed on the outer peripheral surface of the rubber stopper 13. The projecting ridges 14, 15 are formed annularly with a spacing t smaller than T, and one of the projecting ridges 14, 15 is provided with the elastic lip portion 1.
By setting it to 6, when the rubber plug 13 is fitted into the flat liquid injection port 8, the vicinity of the flat liquid injection port 8 is sandwiched between the ridges 14 and 15 in the thickness direction, and the elastic lip is provided. Since the portion 16 has the effect of tightening, the flat liquid injection port 8 can be hermetically sealed even if the thickness of the flat liquid injection port 8 changes due to blow molding.

FIG. 7 shows still another example of the rubber stopper, which includes a lower rubber stopper 21 having an annular lower protrusion 20 on the outer peripheral surface which fits into the flat liquid injection port 8, and A lower fixing seat 22 integrally provided inside the lower rubber stopper 21, an upper rubber stopper 24 having a tightening portion 23 fitted to an outer periphery of the upper portion of the lower rubber stopper 21, and an upper portion of the upper rubber stopper 24 are provided. An upper fixed seat 25 integrally provided with the upper fixed seat 25 is rotatably attached to the upper fixed seat 25, and a lower end of the upper fixed seat 25 is screwed into the lower fixed seat 22. A rubber plug 27 is provided with an adjusting screw 26 that can be adjusted to tighten the vicinity of the flat liquid injection port 8 between the lower protrusion 20 and the tightening part 23 in the thickness direction.

According to the embodiment shown in FIG. 7, the adjusting screw 26 is rotated to adjust the distance between the lower fixed seat 22 and the upper fixed seat 25, so that the lower projecting portion 20 and the tightening portion 23 can be adjusted. The force for tightening the vicinity of the flat liquid injection port 8 in the wall thickness direction can be adjusted arbitrarily, so that the flat liquid injection port 8 can be more reliably sealed.

In the above embodiment, the case of the reserve tank for the cooling liquid has been described, but it can be applied to reserve tanks for power steering oil, clutch fluid, brake fluid, etc., air outlets and liquid supply pipes for rubber plugs, etc. Needless to say, various modifications may be made without departing from the scope of the present invention.

[0025]

According to the cap sealing structure of the reserve tank of the present invention, the flat liquid injection port is opened in the upper wall of the tank main body, and the flat liquid injection port is closed by the rubber stopper. It is possible to simplify the structure of and to facilitate the blow molding work of the resin of the tank body.

A rubber stopper fitted into the flat liquid injection port is tapered toward the inside of the tank main body, and an annular surface is formed on the outer peripheral surface of the taper shape so as to be in close contact with the inner peripheral surface of the flat liquid injection port. By having a structure with multiple ridges,
The flat injection port can be hermetically sealed with a simple rubber stopper.

On the outer peripheral surface of the rubber plug fitted into the flat liquid injection port, there are formed protrusions annularly protruding with a space smaller than the wall thickness of the flat liquid injection port on the upper wall of the tank body. And by using one of the ridges as the elastic lip,
Since the vicinity of the flat liquid injection port is sandwiched between the ridges in the thickness direction and the elastic lip part has the effect of tightening, the flat opening is airtight even if the thickness changes due to blow molding. Can be sealed on.

A lower rubber stopper having a lower protrusion on the outer peripheral surface which fits into a flat liquid injection port on the upper wall of the tank body;
A lower fixing seat integrally provided inside the lower rubber stopper, an upper rubber stopper having a tightening portion fitted to an upper outer periphery of the lower rubber stopper, and an upper portion integrally provided at an upper portion of the upper rubber stopper. It is rotatably attached to the fixed seat and the upper fixed seat, and the lower end is screwed into the lower fixed seat, and the distance between the lower fixed seat and the upper fixed seat is adjusted by rotation to tighten the lower protruding portion. With the configuration including an adjusting screw capable of tightening the vicinity of the flat liquid injection port in the thickness direction with the section, the adjusting screw is rotated to adjust the distance between the lower fixed seat and the upper fixed seat. By doing so, the force for tightening the vicinity of the flat liquid injection port in the thickness direction between the lower protrusion and the tightening part can be adjusted arbitrarily, and thus the flat liquid injection port can be more reliably sealed. be able to.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a tank main body according to an embodiment of the present invention.

FIG. 2 is a perspective view of a rubber plug.

FIG. 3 is a side view showing an example of the configuration of a rubber stopper that seals a flat liquid injection port.

FIG. 4 is a half sectional view showing another example of the configuration of the rubber plug.

5 is a half cross-sectional view showing a state where the flat liquid injection port is sealed by the rubber stopper of FIG.

6 is a half sectional view of a rubber plug similar to the form of FIG. 4. FIG.

FIG. 7 is a vertical sectional view showing still another example of the configuration of the rubber plug.

FIG. 8 is a cut side view showing an example of a conventional cap seal structure for a reserve tank.

[Explanation of symbols]

 7 Tank Main Body 7a Tank Main Body Upper Wall 8 Flat Liquid Injection Port 9 Rubber Plug 10 Ridge 13 Rubber Plug 14 Upper Ridge (Ridge) 15 Lower Ridge (Ridge) 16 Elastic Lip 20 Lower Ridge 21 Lower Rubber Plug 22 Lower Fixing Seat 23 Tightening Part 24 Upper Rubber Plug 25 Upper Fixing Seat 26 Adjusting Screw 27 Rubber Plug T Wall Thickness t Interval

Claims (4)

[Claims] 1. A cap seal structure for a reserve tank, comprising: a flat liquid injection port opened on an upper wall of a tank body; and a rubber stopper capable of sealing the flat liquid injection port. 2. A rubber stopper fitted to the flat liquid injection port has a taper shape which is tapered toward the inside of the tank body, and the outer peripheral surface of the taper shape is in close contact with the inner peripheral surface of the flat liquid injection port. The reserve tank cap seal structure according to claim 1, further comprising a plurality of annular protrusions. 3. A rubber plug fitted into the flat liquid injection port has, on an outer peripheral surface thereof, a ridge portion projecting annularly with a space smaller than the wall thickness of the flat liquid injection port portion of the upper wall of the tank body. The cap seal structure for a reserve tank according to claim 1, wherein one of the protrusions constitutes an elastic lip portion. 4. A lower rubber stopper having a rubber projection, the lower rubber stopper having an outer peripheral surface fitted to a flat liquid injection port on the upper wall of the tank main body, and a lower fixing seat integrally provided inside the lower rubber stopper. When,
An upper rubber stopper having a tightening portion that fits around the upper periphery of the lower rubber stopper, an upper fixed seat integrally provided on the upper portion of the upper rubber stopper, and a lower end rotatably attached to the upper fixed seat. Is screwed onto the lower fixed seat, and the space between the lower fixed seat and the upper fixed seat is adjusted by rotation to tighten the flat liquid injection port in the thickness direction between the lower protruding part and the tightening part. The reserve tank cap seal structure according to claim 1, further comprising an adjusting screw for obtaining the same.