JP2002193057A - Hollow unit for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a hollow unit for an automobile having a shock absorbing rib uniform in shape, dimension, and thickness as a whole to be excellent in shock absorptiveness with large mechanical strength of rigidity or the like. SOLUTION: This hollow unit for an automobile 21, integrally molded by blow molding to be made of thermoplastic resin, has one wall 22 and the other wall 23 opposed to each other with a space apart in a direction applying a shock, and one side wall 24 and the other side wall 25 are successively provided in line with both side end parts of one wall 22 and the other wall 23. A shock absorbing rib 30 integrally molded at blow molding time is provided between one wall 22 and the other wall 23, and this shock absorbing rib 30 is constituted such that tip ends of a plate-shaped rib 26 protruded toward one wall 22 from the other wall 23 and a hollowed rib 27 adjacent to both side ends of the plate- shaped rib 26 and an inner surface of one wall 22 are integrally formed through a deposition part 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow body for an automobile having excellent shock absorption.

[0002]

2. Description of the Related Art In order to ensure the safety of an occupant from an impact at the time of a collision in an automobile, a roof side duct for the automobile has been proposed which is disposed near both sides of a ceiling as described below.

This conventional roof side duct has an integral rib generally widely known as an inner rib. As shown in FIG. 11, this conventional roof side duct 100 is obtained by integrally molding an inner rib as a shock absorbing rib by blow molding, and includes an inner wall portion 101 facing a ceiling interior material 107 and an inner panel of a vehicle body. The outer wall 102 facing the outer wall 102 is opposed to the outer wall 102, and a space 110 between the inner wall 101 and the outer wall 102 is provided with a plate-shaped shock absorbing rib 103 along the longitudinal direction. Hereinafter, a general manufacturing method of the roof side duct 100 will be described.

As shown in FIG. 12A, a melted parison 300 is placed between split molds 201 and 202 which have been opened, and then the mold is closed. Then, the rib forming plate 203
Is projected toward the other mold 202 to form a constricted portion 303 at a portion to be one wall 301 of the parison, and the tip thereof is pressed against a portion to be the other wall 302. Thereafter, as shown in FIG. 12B, after the rib forming plate 203 is pulled in, a pressurized fluid is introduced into the parison 300,
The inner pressure of the pressurized fluid expands into a shape along the cavity, and the constricted portion 303 is pressed and deformed in the direction of the arrow,
The impact absorbing rib 30 is formed by welding and integrating the opposing wall surfaces.
4 (see JP-A-2000-43541).

[0005]

In the above prior art,
As shown in FIG. 13, when the rib forming plate is protruded to form a constricted portion on one wall side of the parison and then the rib forming plate is retracted, the constricted portion is dragged in the retreating direction of the rib formed plate or blown. During the process, the inner rib is stretched by the blow pressure, and the inner wall of the constricted portion is compressed by the internal pressure of the pressurized fluid from both sides, thereby reducing the thickness and width of the inner rib (so-called thin 305 of the inner rib is generated). ), The shape, dimensions and wall thickness of the inner ribs are non-uniform as a whole. As a result, there is a problem in that the mechanical strength such as the rigidity of the shock absorbing rib 304 is reduced, and a roof side duct having sufficient shock absorbing properties cannot be manufactured.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has a shock absorbing rib having a uniform shape, size and thickness as a whole, and a mechanical strength such as rigidity. It is an object of the present invention to realize a hollow body for an automobile having a large impact and excellent in shock absorption.

[0007]

In order to achieve the above object, a hollow body for an automobile according to a first aspect of the present invention is integrally formed by blow molding, and is provided at a distance in a direction in which an impact is applied. A hollow body made of a thermoplastic resin, having one wall and the other wall, and having a shock absorbing rib for absorbing the shock between the one wall and the other wall. The impact absorbing rib has a plate-like rib protruding from the other wall toward the one wall and a concave rib adjacent to both side ends of the plate-like rib. The front end is welded to the inner surface of the one wall.

According to a second aspect of the present invention, there is provided a hollow body for an automobile, which is integrally formed by blow molding, has one wall and the other wall opposed to each other with an interval in a direction in which an impact is applied. A shock absorbing rib for absorbing the shock is provided between one wall and the other wall.In a hollow body made of a thermoplastic resin for an automobile, the shock absorbing rib is formed from the one wall. One rib consisting of one plate rib protruding toward the other wall and one concave rib adjacent to both side ends of the one plate rib; and protruding from the other wall toward the one wall And the other rib comprising the other concave rib adjacent to both side ends of the other plate-shaped rib and the other plate-shaped rib, and the tip of the one rib is welded to the tip of the other rib. It is characterized by being It is.

Further, it is assumed that the shock absorbing rib is provided along the longitudinal direction of the hollow body for an automobile.

[0010] Further, it is assumed that one wall is inclined with respect to the other wall.

Further, it is assumed that a plurality of shock absorbing ribs are provided at an interval from each other.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of a hollow body for an automobile according to the present invention will be described.

FIG. 1 shows a hollow body for an automobile according to a first embodiment, in which (a) is a schematic partial perspective view broken at a shock absorbing rib portion, and (b) is a line AA in (a). It is a schematic partial sectional view along.

The hollow body 1 for an automobile is made of a thermoplastic resin integrally formed by blow molding, and has one wall 2 and the other wall 3 facing each other at a distance in a direction in which an impact is applied. The one wall 2 is inclined with respect to the other wall 3, and the one side wall 4 and the other side wall 5, which are continuously provided at both end portions of the one wall 2 and the other wall 3, are substantially parallel to each other. ing.

A shock absorbing rib 10 integrally formed at the time of blow molding is provided between the one wall 2 and the other wall 3, and the shock absorbing rib 10 extends from one wall 2 to the other wall 3. From the other wall 3 to the one wall 2 from the other wall 3 to the tip of one of the ribs, which is composed of one of the plate-like ribs 6 protruding toward the other and one of the concave ribs 8 adjacent to both side ends of the one of the plate-like ribs 6. The tip of the other rib formed of the other protruding other rib 7 and the other concave rib 9 adjacent to both side ends of the other flat rib 7 is integrated via a welded portion 11. is there.

Next, the second embodiment of the hollow body for an automobile according to the present invention will be described.
An embodiment will be described.

FIG. 2 shows a hollow body for an automobile according to a second embodiment, in which (a) is a schematic partial perspective view broken at a shock absorbing rib portion, and (b) is a sectional view taken along line AA of (a). It is a schematic partial sectional view along.

The hollow body 21 for an automobile is made of a thermoplastic resin integrally formed by blow molding, and has one wall 22 and the other wall 23 facing each other with an interval in a direction in which an impact is applied. The one wall 22 is inclined with respect to the other wall 23, and the one side wall 24 and the other side wall 25, which are provided at both end portions of the one wall 22 and the other wall 23, are substantially parallel to each other. ing.

A shock absorbing rib 30 integrally formed at the time of blow molding is provided between the one wall 22 and the other wall 23.
The shock absorbing rib 30 includes a plate-like rib 26 protruding from the other wall 23 toward the one wall 22, and a tip of a concave rib 27 adjacent to both ends of the plate-like rib 26, and one end of the rib 27. The inner surface of the wall 22 is integrated via a welded portion 31.

In the present invention, the thermoplastic resin constituting the hollow body for automobiles is not particularly limited as long as it can be blow-molded. However, high-density polyethylene, medium-density polyethylene, polypropylene, modified prephenylene oxide, polycarbonate , Polyamide, ABS resin and the like are preferable.

Further, the shock absorbing ribs composed of the plate-like ribs and the concave ribs adjacent to both side ends of the plate-like ribs are not limited to the one described in the above-described embodiment, but may be two or more if necessary. The shock absorbing ribs may be provided at a distance from each other.

Further, the cross-sectional shape of the hollow body for an automobile is not limited to the substantially trapezoidal shape shown in the above embodiment as long as it has one wall and the other wall facing each other. Any shape such as a square, a rectangle, and a parallelogram can be used accordingly.

The hollow body for automobiles according to the present invention can be used for exterior and interior materials such as bumpers, hoods, doors, console box lids, air-conditioning ducts, pillar ducts and the like of automobiles.

Incidentally, a description will be given of an example in which a hollow body for an automobile similar to that shown in FIG. 1 is used as an air conditioning duct for an automobile, which is disposed on both sides of the ceiling of the passenger compartment.

As shown in FIG. 3, the hollow body 1 for an automobile disposed on both sides of the ceiling of the passenger compartment is provided with the above-described two shock absorbing ribs 10 at intervals along the longitudinal direction. , A connection duct 35 having one end disposed on the rear side.
Are connected to the connecting portions 35a and 35b provided on both sides of the, and the other end is closed. One wall 2 and the other side wall 5 face the vehicle interior, and the other wall 3 and the one side wall 4
Is disposed so as to face the vehicle body side, and a discharge port 36 is provided at a portion of one wall 2 where the shock absorbing rib 10 is not provided.
Is provided.

The conditioned air supplied from the air conditioner (not shown) via the connection duct 35 is supplied to the shock absorbing rib 1.
Since the air is discharged from the discharge port 36 toward the occupant through the flow path of the hollow body 1 for automobiles formed on both sides of the vehicle body 0, uniform air conditioning in the vehicle interior is possible. Further, when the occupant's head makes a secondary collision with one of the walls 2 at the time of the collision, the impact is absorbed by the shock absorbing ribs 10 having a sufficient shock absorbing property, and the safety of the occupant is ensured.

Next, an example of a method for manufacturing a hollow body for an automobile according to the present invention will be described.

(1) As shown in FIGS. 4A and 4B, the support cores 46 and 48 and the slide cores 45 and 47 of one mold 41 and the other mold 42 are attached to the tip 45.
a, 47a are the tips 46a of the support cores 46, 48,
One mold 41 and the other mold 42 are opened in a state where they protrude to a position on the same plane as 48a.

Here, one mold 41 is provided with a cavity 41a for regulating approximately half the outer surface on one wall 2 side of the hollow body 1 for an automobile, and a slide core 45 for forming one plate-like rib 6. And a pair of support cores 46 for forming one concave rib 8 provided adjacent to both side ends of one plate-like rib 6. On the other hand, the other mold 4
2 is a cavity 42a for regulating the outer surface of the remaining portion of the hollow body 1 for automobiles on the other wall 3 side, and the other plate-like rib 7
And a pair of support cores 48 for forming the other concave rib 9 adjacent to both side ends of the other plate-like rib 7.

Each of the support cores is not limited to the above-mentioned one, but may be a movable support core similar to the movable support core 66 shown in FIG.

(2) After the above (1), a parison 44 made of a molten thermoplastic resin is extruded from an extrusion head 43 of an extruder (not shown), and the molds 41 and 42 are opened.
After placing it in between, mold closing starts.

As the closing of the mold proceeds, FIG.
As shown in (b), the slide core 4 of one mold 41 is formed.
5 and the support core 46 protrude and deform one wall side of the parison 44 to form one recess 44a, and the slide core 47 and the support core 48 of the other mold 42 protrude and deform the other wall side of the parison 44. Then, the other concave portion 44b is formed, and when the mold closing is completed, the distal end portion of one concave portion 44a and the distal end portion of the other concave portion 44b are welded to form a welded portion 51.

(3) After the above (2), FIG.
As shown in (b), each slide core 45, 47 is pulled in.

In this case, both sides of the one concave portion 44a and the other concave portion 44b are respectively supported by the support cores 46,
Since only the slide cores 45 and 47 are retracted in a state where the slide cores 45 and 47 are fixed at the positions protruded by 48, each of the recesses 44a and 44b formed in the parison 44 is caused by the retraction of the slide cores 45 and 47. No drag phenomenon occurs.

(4) After the above (3), a pressurized fluid is introduced into the parison 44 by piercing a blowing means such as a blowing needle (not shown) to introduce a pressurized fluid, as shown in FIGS. 7 (a) and 7 (b). In addition to the expansion along the outer surfaces of the support cores 41a and 42a and the support cores 46 and 48, the opposing wall surfaces of the recesses 44a and 44b are pressed and deformed by the internal pressure of the pressurized fluid to be pressed.

As a result, as shown in FIG. 1, one wall 2 and the other wall 3 are opposed to each other at an interval in the direction in which the impact is applied, and the space between the one wall 2 and the other wall 3 is provided. A tip of one rib composed of one plate rib 6 protruding from one wall 2 toward the other wall 3 and one concave rib 8 adjacent to both side ends of the one plate rib 6; The other rib-like ribs 7 protruding from the other wall 3 toward the one wall 2 and the other rib-like ribs 9 adjacent to both side ends of the other rib-like rib 7 form a welded portion. 11
Shock-absorbing ribs 10 which are integrated through
Is formed.

In this case, since both ends of the welded portion 51 on the support core side are completely fixed by the support cores 46 and 48, the inner rib does not become thin even when expanded at the time of the blowing step.

(5) After the above (4), the dies 41 and 42
After cooling in the mold, the mold is opened and the hollow body 1
And remove unnecessary burrs.

Next, another example of the method for manufacturing a hollow body for an automobile according to the present invention will be described.

(1) As shown in FIGS. 8A and 8B, one slide 61 and the support core 66 of one mold 61 and the other mold 62 are pulled into the position shown in FIG. The mold 61 and the other mold 62 are opened.

Here, one of the molds 61 has a cavity 61a which regulates a substantially half outer surface on one wall 22 side of the hollow body 21 for an automobile. On the other hand, the other mold 62
Is a cavity 62a for regulating the outer surface of the remaining portion on the other wall 23 side of the hollow body 21 for a vehicle, a slide core 65 for forming the plate-like rib 26, and adjacent to both side ends of the plate-like rib 26. It has a pair of support cores 66 for forming the concave rib 27. The pair of support cores 66 are disposed so as to be able to advance and retreat toward one mold 61.

The support cores are not limited to the above-mentioned movable cores, but may be ones provided integrally with the other mold 62.

(2) After the above (1), a parison 64 made of a molten thermoplastic resin is extruded from an extrusion head 63 of an extruder (not shown), and dies 61 and 62 are opened.
After placing it in between, mold closing starts.

As shown in FIGS. 9A and 9B, the slide core 65 and the support core 66 are protruded toward one of the dies 61 together with the start of closing the mold or at a slight time difference. 64 is formed by projecting one wall side to form a concave portion 64a.
Is welded to the inner surface on the other wall side of the parison to form a welded portion 71.

(3) After the above (2), the support core 6
Reference numeral 6 denotes a protruding state, and only the slide core 65 is retracted.

The phenomenon that the concave portion 64a formed in the parison 64 is dragged by the retraction of the slide core 65 does not occur.

(4) After the above (3), a pressurized fluid is introduced into the parison 64 by piercing a blowing means such as a blowing needle (not shown), and a cavity is formed as shown in FIGS. 10 (a) and 10 (b). In addition to the expansion along the outer surfaces of the support cores 61a, 62a and the support core 66, the opposing wall surfaces of the concave portion 64a are pressed and deformed by the internal pressure of the pressurized fluid, and are pressed.

As a result, as shown in FIG. 2, one wall 22 and the other wall 23 are opposed to each other at a distance in the direction in which the impact is applied, and between the one wall 22 and the other wall 23. The tip of the plate-like rib 26 protruding from the other wall 23 toward the one wall 22 and the concave rib 27 adjacent to both side ends of the plate-like rib 26 are welded to the inner surface of the one wall 22 via the welded portion 31. The shock absorbing ribs 30 are formed integrally.

In this case, since both ends of the welded portion 71 on the support core side are completely fixed by the support core 66, even if the inner rib is expanded during the blowing step, the inner rib does not become thin.

(5) After the above (4), the mold is cooled in a mold, and then the mold is opened to take out the automobile hollow body 21 and remove unnecessary burrs.

In the method for manufacturing a hollow body for an automobile according to the present invention, the slide core which is disposed in the mold so as to be able to move forward and backward is
A coating layer made of a fluororesin that is slippery on the parison may be formed on the surface of the slide core. If the surface of the slide core is roughened to form a fluororesin coating layer on the surface of the slide core, the fluororesin coating layer can be formed firmly.

The coating layer may be a thin layer made of a fluorine-based resin, or may be co-deposited with a fluorine-based resin and a plating solution such as electroless nickel in a processing solution, and the processing solution may be applied to the surface of the slide core. It can be applied and fired to form a coating layer. Alternatively, a coating layer can be formed by forming an electrolytic nickel film on the surface of the slide core and impregnating the electroless nickel film with a fluorine-based resin.

[0053]

Since the present invention is configured as described above, the following effects can be obtained.

The hollow body for an automobile according to the present invention has a plate-like rib and a concave shape adjacent to both side ends of the plate-like rib between one wall and the other wall which are opposed to each other with an interval in a direction in which an impact is applied. Since the shock absorbing ribs made of ribs are integrally formed, the shock absorbing ribs having a uniform shape, size and thickness can be integrally formed during blow molding. As a result, an automobile hollow body having excellent shock absorbing properties can be obtained.

[Brief description of the drawings]

FIGS. 1A and 1B show a hollow body for an automobile according to a first embodiment, in which FIG. 1A is a schematic partial perspective view taken along a shock absorbing rib portion, and FIG. 1B is a schematic view taken along line AA of FIG. It is a partial sectional view.

FIGS. 2A and 2B show a hollow body for an automobile according to a second embodiment, in which FIG. 2A is a schematic partial perspective view cut along a shock absorbing rib, and FIG. 2B is a schematic view taken along line AA of FIG. It is a partial sectional view.

FIG. 3 is an explanatory view showing an example of use of the hollow body for an automobile according to the present invention.

4A and 4B show one step in an example of the method for manufacturing a hollow body for an automobile according to the present invention, wherein FIG. 4A is an explanatory view showing a state in which a parison is arranged between opened molds, and FIG. a)
FIG. 3 is a schematic cross-sectional view taken along line AA of FIG.

5 shows a state at the time of completion of mold closing after the step shown in FIG. 4, (a) is a schematic partial sectional view along the axial direction of the parison,
(B) is a schematic sectional view along the AA line of (a).

6 (a) is a schematic partial cross-sectional view along the axial direction of the parison, and FIG. 6 (b) is a sectional view taken along line AA of FIG. It is a schematic cross section along.

7A and 7B show a state at the time of completion of the introduction of the pressurized fluid after the step shown in FIG. 6, wherein FIG. 7A is a schematic partial sectional view along the axial direction of the parison, and FIG. 7B is a line AA of FIG. FIG.

FIG. 8 shows one step in another example of the method for manufacturing a hollow body for an automobile according to the present invention, in which (a) is an explanatory view showing a state in which a parison is arranged between opened molds, and (b). FIG. 2 is a schematic cross-sectional view taken along line AA of FIG.

9 shows a state at the time of completion of mold closing after the step shown in FIG. 8, (a) is a schematic partial sectional view along the axial direction of the parison,
(B) is a schematic sectional view along the AA line of (a).

10A and 10B show a state at the time of completion of the introduction of the pressurized fluid after the step shown in FIG. 9, wherein FIG. 10A is a schematic partial cross-sectional view along the axial direction of the parison, and FIG. FIG.

FIG. 11 is a schematic sectional view showing a conventional roof side duct after an inner panel is attached.

FIG. 12 is a schematic cross-sectional view showing a process of the method for manufacturing the roof side duct shown in FIG. 11, in which (a) shows a state in which a constriction (concave portion) is formed in the parison by a rib forming plate;
(B) is a schematic sectional view showing a state at the time of completion of the introduction of the pressurized fluid.

FIG. 13 is a schematic sectional view taken along line AA of FIG. 12 (b).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 21 Automotive hollow body 2, 22 One wall 3, 23 The other wall 4, 24 One side wall 5, 25 The other side wall 6 One plate-shaped rib 7 The other plate-shaped rib 8 One concave rib 9 The other Concave ribs 10, 30 shock absorbing ribs 11, 31, 51, 71 welding portion 26 plate-shaped rib 27 concave rib 35 connecting duct 35a, 35b connecting portion 36 discharge port 41, 61 one mold 42, 62 the other mold Molds 41a, 42a, 61a, 62a Cavities 43, 63 Extrusion heads 44, 64 Parisons 45, 47, 65 Slide cores 46, 48, 66 Support cores

Claims (5)

[Claims] 1. One wall and another wall which are integrally formed by blow molding and are opposed to each other with an interval in a direction in which an impact is applied. In a hollow body made of a thermoplastic resin, which is provided with a shock absorbing rib for absorbing the shock therebetween, the shock absorbing rib has a plate shape protruding from the other wall toward the one wall. A hollow body for automobiles, comprising: a rib and concave ribs adjacent to both side ends of the plate-shaped rib, wherein a tip end of the plate-shaped rib and the concave rib are welded to an inner surface of the one wall. . 2. An integral molding by blow molding, comprising one wall and the other wall facing each other at a distance in a direction in which an impact is applied. A shock absorbing rib for absorbing the shock is provided therebetween, in a thermoplastic resin automobile hollow body, wherein the shock absorbing rib projects from one wall toward the other wall. One rib consisting of a plate-shaped rib and one concave rib adjacent to both side ends of the one plate-shaped rib, and the other plate-shaped rib projecting from the other wall toward the one wall and the other Having the other rib consisting of the other concave rib adjacent to both side ends of the plate-like rib,
A hollow body for an automobile, wherein a tip of the one rib and a tip of the other rib are welded. 3. An impact absorbing rib is provided along a longitudinal direction of a hollow body for an automobile.
Or the hollow body for an automobile according to 2. 4. The hollow body for an automobile according to claim 1, wherein one wall is inclined with respect to the other wall. 5. A plurality of shock absorbing ribs are provided at an interval from each other.
The hollow body for an automobile according to any one of the preceding claims.