JP7079712B2 - Resin molded product - Google Patents

Description

The present invention relates to a resin molded product having a container shape and having an insert nut having a female thread portion formed through at least one wall surface in advance by insert molding or welding.

Conventionally, for example, as in Patent Document 1, an uneven strip is provided on the outer peripheral surface, is embedded in a hole formed through a molded product of synthetic resin, and the uneven strip and the synthetic resin are fixed by biting into each other. It is known that an annular sealing member that presses against the wall surface of a hole is provided on the outer surface of the embedded fastener. In this fastener, since the seal member is embedded at the same time as the fastener, the seal member does not come off.

Japanese Unexamined Patent Publication No. 5-126124

However, in the structure as in Patent Document 1, when the insert nut is press-fitted by insert molding, ultrasonic welding or heat welding, there is a problem that the sealing member is also heated and deteriorated, and the sealing performance is deteriorated. ..

On the other hand, if the seal member is later provided on the insert nut, the seal member may come off.

The present invention has been made in view of this point, and an object thereof is to prevent deterioration of the sealing member at the time of inserting the insert nut and to surely prevent the sealing member from coming off to ensure sealing performance. There is something in it.

In order to achieve the above object, in the present invention, the insert nut is inserted into the through hole on the resin side, and then the seal member is inserted and the stopper member is used to prevent the insert nut from coming off.

Specifically, in the first invention,
In a resin molded product having a container shape and having an insert nut having a female thread portion formed through at least one wall surface in advance by insert molding or welding.
On the inner wall of the through hole on the resin side where the insert nut is inserted,
A resin-side sealing surface in which the sealing member is in close contact with the front side in the insertion direction of the sealing member,
A resin-side joint surface to which the insert nut is joined is formed on the back side in the insertion direction of the seal member.
For the above insert nut,
The nut-side sealing surface facing the resin-side sealing surface and
A nut-side joint facing the resin-side joint surface is provided.
A stopper member for preventing the seal member from falling off is provided on the front side of the insert nut in the insertion direction with respect to the nut side seal surface.
The stopper member is
A stopper-side annular portion arranged on the outer periphery of the insert nut on the outer periphery on the front side in the insertion direction from the nut-side sealing surface,
It has a plurality of elastically deformable stopper-side engaging pieces formed on the stopper-side annular portion, and has a plurality of elastically deformable stopper-side engaging pieces.
The insert nut includes a nut-side engaging portion in which the stopper-side engaging piece is engaged with the outer periphery on the front side in the insertion direction from the nut-side sealing surface to prevent the stopper member from coming off.

According to the above configuration, by inserting the stopper member after inserting the seal member, the seal member can be easily prevented from coming off. Therefore, when the insert nut is insert-molded or welded into the through hole on the resin side, it is not necessary to insert the insert nut together with the sealing member as in the conventional case, so that the sealing member does not deteriorate and the sealing performance can be improved.

In the second invention, in the first invention,
The stopper member is
The stopper-side standing wall extending from the stopper-side annular portion to the front side in the insertion direction,
It has a stopper-side opening formed in the stopper-side standing wall, and has a stopper-side opening.
The stopper-side engaging piece extends cantileverly from the peripheral edge of the stopper-side opening toward the inside of the stopper-side annular portion in the radial direction.

According to the above configuration, since the stopper-side engaging piece is easily elastically deformed, the stopper member can be easily inserted while being deformed.

In the third invention, in the first or second invention,
The stopper member has a stopper-side bottom wall portion that can press the seal member when the stopper member is inserted in the stopper-side annular portion.

According to the above configuration, by pressing the seal member at the bottom wall portion on the stopper side, the seal member can be reliably pushed in and the seal performance can be ensured.

In the fourth invention, in the third invention,
When the stopper member is pulled toward the front side in the insertion direction, the stopper-side engaging piece abuts on the stopper-side bottom wall portion, and the stopper-side engaging piece and the nut-side engaging portion engage with each other. It is configured to prevent it from being released.

According to the above configuration, the stopper-side bottom wall portion regulates the deformation of the stopper-side engaging piece to prevent the stopper member from coming off. Therefore, the sealing member does not accidentally come off, and the sealing performance is maintained.

In the fifth invention, in any one of the first to fourth inventions,
A container for storing liquids
The insert nut is provided at the discharge port of the container and is configured so that a drain bolt can be fastened.

According to the above configuration, a liquid storage container having excellent sealing performance and high commercial value can be obtained.

As described above, according to the present invention, after the insert nut is inserted into the through hole on the resin side, the seal member is inserted and the seal member is prevented from coming off by the stopper member. It is possible to prevent the deterioration of the sealing member in the above-mentioned, and to surely prevent the sealing member from coming off to ensure the sealing performance.

FIG. 2 is an enlarged end view taken along the line I-I of FIG. It is a perspective view which shows the oil pan in which the insert nut which concerns on embodiment of this invention is inserted. It is an enlarged perspective view which shows the insert nut, an O-ring, and a stopper member in an assembled state. It is an exploded perspective view which shows the insert nut, an O-ring and a stopper member. It is an end view which shows the assembly procedure of an O-ring and a stopper member, (a) shows the time when the O-ring is inserted, (b) shows the time when the O-ring is pressed, and (c) shows the time when the insertion of the stopper member is completed. .. It is an end view which shows the state when the stopper member is pulled. It is an enlarged perspective view which shows the stopper side engaging piece which concerns on the modification 1 of the Embodiment of this invention, and the periphery thereof partially broken. It is an enlarged perspective view which shows the insert nut which concerns on the modification 2 of the Embodiment of this invention. FIG. 1 is an end view corresponding to FIG. 1 according to a modification 3 of the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows an oil pan 1 as a resin molded product according to an embodiment of the present invention. The oil pan 1 is a container for storing lubricating oil, and has a rectangular bottom plate 2 and side plates 3 covering all sides of the bottom plate 2. And have. On the wall surface of one side plate 3, a discharge port 4 projecting in a cylindrical shape is provided. As shown in FIG. 1, an insert nut 10 is embedded in the resin-side through hole 5 of the discharge port 4. The insert nut 10 has a female threaded portion 10a formed through the center thereof, and the male threaded portion 7 of the drain bolt 6 can be fastened to the female threaded portion 10a. A ring-shaped gasket 8 may be provided on the head side of the outer periphery of the male screw portion 7 of the drain bolt 6.

The insert nut 10 is made of, for example, aluminum, and is pre-molded in the resin side through hole 5 at the time of injection molding of the oil pan 1. The insert nut 10 may be press-fitted by, for example, ultrasonic welding, or may be press-fitted in a superheated state such as heat welding. The insert nut may be made of a metal other than aluminum.

As shown in FIG. 4A, the resin in which the O-ring 11 is in close contact with the inner wall of the resin-side through hole 5 into which the insert nut 10 is inserted is on the front side in the insertion direction of the O-ring 11 as a sealing member. A side sealing surface 5a and a resin side bonding surface 5b to which an insert nut 10 is bonded are formed on the inner side of the O-ring 11 in the insertion direction.

On the other hand, as shown in FIGS. 3A and 3B, the insert nut 10 is provided with a nut-side sealing surface 10b facing the resin-side sealing surface 5a and a nut-side joining portion 10c facing the resin-side joining surface 5b. Has been done. In the present embodiment, the nut side joint portion 10c is knurled so that the insert nut 10 does not rotate with the drain bolt 6 due to the torque applied when the drain bolt 6 is fastened.

As shown in FIGS. 1, 3A and 3B, a stopper member 20 for preventing the O-ring 11 from falling off is provided on the front side of the insert nut 10 in the insertion direction with respect to the nut-side sealing surface 10b. The stopper member 20 has a stopper-side annular portion 21 arranged on the outer periphery of the insert nut 10 on the outer periphery on the front side in the insertion direction from the nut-side seal surface 10b, and, for example, three elastic deformations formed on the stopper-side annular portion 21. It has a possible stopper-side engaging piece 22. It should be noted that two stopper-side engaging pieces 22 may be provided, or four or more pieces may be provided.

The insert nut 10 includes a nut-side engaging portion 10d in which the stopper-side engaging piece 22 is engaged with the outer periphery on the front side in the insertion direction from the nut-side sealing surface 10b to prevent the stopper member 20 from coming off. ..

Further, the stopper member 20 has a stopper-side standing wall portion 23 extending from the stopper-side annular portion 21 to the front side in the insertion direction, and a stopper-side opening 24 formed in the stopper-side standing wall portion 23.

The stopper-side engaging piece 22 extends cantileverly from the peripheral edge of the stopper-side opening 24 toward the inside of the stopper-side annular portion 21 in the radial direction.

Further, the stopper member 20 has a stopper-side bottom wall portion 25 capable of pressing the O-ring 11 when the stopper member 20 is inserted in the stopper-side annular portion 21. In the present embodiment, the stopper-side bottom wall portion 25 is continuously provided in an annular shape, but it may be provided at least below the stopper-side opening, and is partially discontinuous in the circumferential direction. You may.

As will be described in detail later, by providing the stopper side bottom wall portion 25, as shown in FIG. 5, when the stopper member 20 is pulled toward the front side in the insertion direction, the stopper side engaging piece 22 becomes the stopper side bottom wall. It is configured to come into contact with the portion 25 and prevent the stopper-side engaging piece 22 from being disengaged from the nut-side engaging portion 10d.

Next, the procedure for assembling the O-ring according to the present embodiment will be described.

The insert nut 10 is insert-molded in advance at the time of injection molding of the oil pan 1. At the time of injection molding, a sealing member such as an O-ring 11 is not provided. At the time of insert molding, the molten resin is welded between the resin-side joint surface 5b and the nut-side joint portion 10c to ensure a certain degree of sealing property, but sufficient sealing property is not obtained as it is.

Therefore, as shown in FIG. 4A, the O-ring 11 is inserted. In this state, the O-ring 11 cannot be completely press-fitted between the resin-side sealing surface 5a and the nut-side sealing surface 10b.

Next, as shown in FIG. 4B, the stopper member 20 is inserted from above the O-ring 11. When the stopper member 20 is inserted, the stopper-side engaging piece 22 protrudes inward in the radial direction, so that the stopper-side engaging piece 22 comes into contact with the nut-side engaging portion 10d of the insert nut 10. However, since the stopper-side engaging piece 22 has a cantilever shape and flexibility, the stopper-side engaging piece 22 is easily elastically deformed and can be easily inserted while deforming the stopper member 20. At this time, since the O-ring 11 is pressed by the bottom surface of the bottom wall portion 25 on the stopper side, the O-ring 11 is securely inserted as shown in FIG. 4 (c). By pressing the O-ring 11 with the bottom wall portion 25 on the stopper side in this way, the O-ring 11 can be reliably pushed in and the sealing performance can be ensured.

Then, by inserting the stopper member 20 after inserting the O-ring 11, the O-ring 11 can be easily prevented from coming off. Therefore, when the insert nut 10 is press-fitted into the resin side through hole 5 by insert molding or welding, it is not necessary to insert the insert nut 10 together with the O-ring 11 as in the conventional case, so that the O-ring 11 does not deteriorate and the sealing performance is improved. Can be made to.

On the other hand, even if a force that pulls the stopper member 20 is applied after the O-ring 11 is attached, or the stopper-side engaging piece 22 pushed by the nut-side engaging portion 10d is deformed as shown in FIG. Since the stopper-side engaging piece 22 comes into contact with the stopper-side bottom wall portion 25 and the deformation of the stopper-side engaging piece 22 is restricted, the stopper member 20 does not come off. Therefore, the O-ring 11 does not accidentally come off, and the sealing performance is maintained.

Therefore, according to the oil pan 1 according to the present embodiment, after the insert nut 10 is inserted into the resin side through hole 5, the O-ring 11 is inserted and the O-ring 11 is prevented from coming off by the stopper member 20. The deterioration of the O-ring 11 at the time of inserting the insert nut 10 can be prevented, and the O-ring 11 can be reliably prevented from coming off to ensure the sealing performance. In addition, an oil pan 1 having excellent sealing performance and high commercial value can be obtained.

-Modification example 1-
FIG. 6 shows an enlarged part of the stopper member 120 according to the first modification of the embodiment of the present invention, and is different from the above embodiment in that the shape of the stopper side engaging piece 122 is different. In each of the following modifications, the same parts as those in FIGS. 1 to 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

That is, the stopper-side engaging piece 122 of this modification extends not inward in the radial direction but inward in the insertion direction. A protrusion 122a protruding inward in the radial direction is formed at the tip of the stopper-side engaging piece 122.

In this modification, the stopper-side engaging piece 122 does not have the retaining effect due to contact with the stopper-side bottom wall portion 125, but the protrusion 122a is caught by the nut-side engaging portion 10d to exert the retaining effect. To.

-Modification example 2-
FIG. 7 shows the nut 210 according to the second modification of the embodiment of the present invention, which is different from the above embodiment in that the shape of the nut side joint 210c is different.

That is, in the present embodiment, the outer circumference of the nut-side joint portion 210c is not cylindrical but polygonal (for example, hexagonal). This shape is particularly suitable for setting in a mold during injection molding.

-Modification example 3-
FIG. 8 shows a part of the oil pan 301 according to the third modification of the embodiment of the present invention, which is different from the above embodiment mainly in that the shape of the discharge port 304 is different.

That is, in the above embodiment, the stopper member 20 is inserted to the inner side of the resin side through hole 5, but in this modification, the nut side engaging portion 10d side of the insert nut 10 is from the peripheral edge of the resin side through hole 305. Also pops out toward the front side in the insertion direction. Even in such a case, deterioration of the O-ring 11 at the time of inserting the insert nut 10 can be prevented, and the O-ring 11 can be reliably prevented from coming off to secure the sealing performance.

(Other embodiments)
The present invention may have the following configurations with respect to the above embodiment.

That is, in the above embodiment, the insert nut 10 is provided on the lower wall surface of the side plate 3 of the oil pan 1, but it may be provided on the wall surface of the bottom plate 2.

In the above embodiment, the resin molded product is the oil pan 1, but it is not particularly limited as long as it is a container-shaped product in which an insert nut such as a cooling water storage tank for storing cooling water is inserted in advance and liquid is stored inside. ..

It should be noted that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications and uses.

Further, in the above embodiment, the O-ring 11 is pressed by the stopper bottom wall portion 25 of the stopper member 20 to press-fit it between the resin side sealing surface 5a and the nut side sealing surface 10b, but the stopper member 20 is inserted. The O-ring 11 may be press-fitted between the resin-side sealing surface 5a and the nut-side sealing surface 10b by using an assembly jig or the like.

1 Oil pan (resin molded product)
2 bottom plate
3 side plate
4 Outlet
5 Through hole on the resin side
5a Resin side sealing surface
5b Resin side joint surface
6 Drain bolt
7 Male thread part
8 Gasket
10 Insert nut
10a Female thread part
10b Nut side sealing surface
10c nut side joint
10d nut side engaging part
11 O-ring (seal member)
20 Stopper member
21 Stopper side annular part
22 Stopper side engaging piece
23 Stopper side standing wall
24 Stopper side opening
25 Stopper side bottom wall part 120 Stopper member 122 Stopper side engaging piece 122a Protrusion part 125 Stopper side bottom wall part 210 Nut 210c Nut side joint part 301 Oil pan 304 Discharge port 305 Resin side through hole

Claims (5)

In a resin molded product having a container shape and having an insert nut (10) having a female screw portion (10a) formed through at least one wall surface in advance by insert molding or welding.
On the inner wall of the resin side through hole (5) into which the insert nut (10) is inserted,
A resin-side sealing surface (5a) in which the sealing member (11) is in close contact with the front side of the sealing member (11) in the insertion direction.
A resin-side joint surface (5b) to which the insert nut (10) is joined is formed on the back side of the seal member (11) in the insertion direction.
The insert nut (10) has
The nut-side sealing surface (10b) facing the resin-side sealing surface (5a) and
A nut-side joint (10c) facing the resin-side joint surface (5b) is provided.
A stopper member (20) for preventing the seal member (11) from falling off is provided on the front side of the insert nut (10) in the insertion direction with respect to the nut side seal surface (10b).
The stopper member (20) is
A stopper-side annular portion (21) arranged on the outer periphery of the insert nut (10) on the outer periphery on the front side in the insertion direction with respect to the nut-side sealing surface (10b).
It has a plurality of elastically deformable stopper-side engaging pieces (22) formed on the stopper-side annular portion (21).
In the insert nut (10), the stopper side engaging piece (22) is engaged with the outer periphery on the front side in the insertion direction from the nut side sealing surface (10b) to prevent the stopper member (20) from coming off. A resin molded product characterized by having a nut-side engaging portion (10d). In the resin molded product according to claim 1,
The stopper member (20) is
The stopper-side standing wall portion (23) extending from the stopper-side annular portion (21) to the front side in the insertion direction, and the stopper-side standing wall portion (23).
It has a stopper-side opening (24) formed in the stopper-side standing wall (23), and has a stopper-side opening (24).
The resin characterized in that the stopper-side engaging piece (22) extends cantileverly from the peripheral edge of the stopper-side opening (24) toward the inside of the stopper-side annular portion (21) in the radial direction. Molding. In the resin molded product according to claim 1 or 2.
The stopper member (20) is characterized by having a stopper-side bottom wall portion (25) capable of pressing the seal member (11) when the stopper member (20) is inserted in the stopper-side annular portion (21). Resin molded product. In the resin molded product according to claim 3,
When the stopper member (20) is pulled toward the front side in the insertion direction, the stopper side engaging piece (22) comes into contact with the stopper side bottom wall portion (25) and the stopper side engaging piece (22). A resin molded product characterized in that it is configured to prevent the engagement between the nut side and the nut side engaging portion (10d) from being disengaged. In the resin molded product according to any one of claims 1 to 4.
A container (1) for storing liquid,
The insert nut (10) is a resin molded product provided at the discharge port (4) of the container (1) so that the drain bolt (6) can be fastened.

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