JP3215660B2 - Resin wheel ornament and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial technical field]

[0001] The present invention relates to an automobile, in particular a truck or 4
The present invention relates to a method of manufacturing a resin-made wheel ornament formed in a cap shape at a top portion and a slope for decorating a center hub hole of an aluminum disc wheel for a WD vehicle.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional wheel ornament 1.
FIG. 8 is a longitudinal sectional view showing an attached state of the wheel ornament 9, and FIG. 8 is a rear view of the conventional wheel ornament 19. A plurality of hub nut mounting portions 2 are formed on the disc wheel 1 by crushing, and a ring-shaped groove 4 having an arc-shaped cross section for fitting a claw of a wheel ornament 19 is formed on an inner peripheral surface of the hub hole 3. The shelf 5 is formed in the upper opening of the hub hole 3 while being formed.

The wheel ornament 19 has a star shape as shown in FIG. 8, the outer edge of which is cut out so as not to interfere with the hub nut. The base 20 (six places in the drawing) is provided in a hanging manner, and a metal holder 22 having a convex claw 21 formed by cutting and raising a spring steel plate is fitted into the lower end of the base 20. .

The base 20 for mounting the metal holder and the variation in the size of the claws 21 of the metal holder are described.
If the two are combined in the worst case, the variation width of the outer diameter D of the mounting claw may be about ± 0.5 mm. Further, when the variation overlaps the variation of the inner diameter of the ring-shaped groove 4 of the disc wheel ± 0.2 mm with the variation, the variation of the mounting white dimension is also referred to as ± 0.7 mm, which is the work of mounting the wheel ornament on the disc wheel 1. It has a bad effect on gender.

[0005] In addition to the variation in the outer diameter of the mounting claw, the mounting claw also has a variation in the up-down direction. Therefore, when the wheel ornament is mounted, the disk claw partially deviates from the disk wheel design surface 6. In some cases, the appearance was poor due to the formation of sloppy floating portions and sinking portions.

Also, a conventional metal holder 22 made of spring steel is used.
In the wheel ornament 19 made of a material, since a spring force acts on the base 20 for attaching the metal holder, a resin material having a certain strength is required. It is necessary to select a crystalline resin containing glass fiber, and there is a disadvantage that the material cost is increased.

However, when the above-mentioned crystalline resin is subjected to a thermal shock test on a molded product, it has a characteristic of being shrunk by heat (recrystallization). Although it is necessary to increase the claw outer diameter (holder diameter) in anticipation of this, there is a disadvantage that the mounting to the disk wheel 1 becomes harder.

[0008]

FIG. 9 is a longitudinal sectional view showing a mounting structure of a conventional resin full wheel cap for an automobile. A plurality of spoon-shaped holders are provided near the outer periphery of the back surface of the full wheel cap body 23. The claw 24 is integrally provided in a hanging manner, and a perfect circular wire ring 26 is fitted into a concave portion 25 provided at the lower end portion inside the holder claw 24. In the figure, 27 is a steel disc wheel. In this method, there is little variation in products, and molding can be performed with an inexpensive resin.

However, as shown in FIG. 1, the shape of the wheel ornament for the truck is such that the hub 7 as the content protrudes more than the disc wheel design surface 6, so that the design surface of the wheel ornament has a top portion 8a and an inclined surface 8a.
b), and a triangular undercut (space) 12 is formed by the slope 8a of the wheel ornament and the outer wall surface of the arc-shaped holder 9; Molding was not possible.

This is because, as shown in the sectional view of the resin mold shown in FIG. 4 used in the present invention, the slide die 16 has a maximum draft angle of 20 degrees with respect to the direction perpendicular to the center axis of the wheel ornament. Since the angle of inclination of the shade portion is larger than this, the undercut cannot be eliminated only by the slide mold 16.

It is conceivable to solidify the undercut portion 12 having the triangular cross section with a resin, but the portion becomes thick and unbalanced with the thickness of the other portions, thereby resulting in a molded product. However, there is a problem that it cannot be put to practical use due to defects such as sink marks and warpage.

[0012]

SUMMARY OF THE INVENTION The present invention is directed to an injection molding apparatus in which a holder having a circular arc-shaped claw is integrally formed on a resin wheel ornament formed in a cap shape at a top portion and a slope. At the time of molding, a triangular undercut portion formed between the inclined surface of the wheel ornament and the outer wall surface of the arc-shaped holder, a semicircular claw at the lower half of the arc-shaped holder, and a concave portion e of a rib are formed. It is an object of the present invention to provide a resin-made wheel ornament which does not cause a problem of undercut at the time and a method of manufacturing the same.

That is, according to the first invention of the present application,
Wheel ornaments are shaded at top 8a and slope 8b
Of the back of resin-made wheel ornament 8
An arc-shaped holder with a plate-shaped cross section
The holder 9 is provided integrally with the holder 9 in a hanging manner.
The plate-like arc portion 9a has radially inward at both ends.
A vertical rib 9b is provided facing the
Setting the recess 9e for fitting the Waiyarin grayed 10 at the lower end
In addition, the outer wall surface of the arc portion 9a is
And a semicircular claw 9d on the lower extension line of the rib 9c and the rib 9c.
It is characterized by having been provided.

Further, a resin wheel according to the second invention is provided.
The production method of the tournament is that the top 8a and the slope 8b have a shade shape.
Of the back of resin-made wheel ornament 8
An arc-shaped holder with a plate-shaped cross section
The holder 9 is provided integrally with the holder 9 in a hanging manner.
The plate-like arc portion 9a has radially inward at both ends.
A vertical rib 9b is provided facing the
The lower end is provided with a recess 9e into which the wiring 10 is fitted.
In addition, the outer wall surface of the arc portion 9a is
And a semicircular claw 9d on the lower extension line of the rib 9c and the rib 9c.
In the resin molding of the resin wheel ornaments provided,
The above-mentioned plate-shaped circular arc is formed on the slope portion 14 of the core mold 13
Part 9a and the recesses formed inward on both sides of the arc part 9a.
9b and the vertical rib 9c formed on the outer wall surface of the arc portion.
E for forming the upper half of the circular arc-shaped holder 9 made of
A mold groove 15 is provided vertically, while a mold groove 15 is provided below the arc-shaped holder 9.
Both sides of slide die 16 end to form half
Is provided on the rib 9b in the lower half of the arc-shaped holder 9.
Forming a recess 9e into which the attached wiring 10 is fitted.
And a projection 17 for
A semi-circular groove 1 for forming a semi-circular claw 9d inside
8 and the slope 8a of the wheel ornament 8 and the circle
Triangular under that occurs between the outer wall surface of the arc-shaped holder 9
The semicircle of the cut portion 12 and the lower half of the arc-shaped holder 9
When forming the claw 9d and the recess 9e of the rib 9b.
It is characterized by being able to eliminate undercut
Things.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a resin-made wheel ornament of the present invention will be described below with reference to FIGS.
FIG. 1 is a longitudinal sectional view of a resin wheel ornament of the present invention, FIG. 2 is a rear view thereof, and FIG. 3 is an enlarged perspective view of an arc-shaped holder portion of the resin wheel ornament.

The resin-made wheel ornament of the present invention comprises:
As shown in FIGS. 1 and 2, the top 8 a and the slope 8 b are formed in a hat shape. An arc-shaped holder 9 is integrally formed in the vicinity of the inside of the outer periphery of the rear surface of the resin-made wheel ornament 8 in a hanging shape. In the drawing, reference numeral 8c denotes a wall of a cutout portion for releasing a hub nut.

The arc-shaped holder 9 is provided as shown in FIG.
The plate-shaped arc portion 9a and both ends of the arc portion 9a
Rib 9b formed in the vertical direction toward the inside of the
Vertical ribs 9c formed on the outer wall surface and ribs 9c
A semicircular claw 9d formed on a downward extension line and the rib
9b, a wire ring 10 provided at the lower end is fitted.
And a recess 9e. The ribs 9c are used to connect the base of the arc-shaped holder 9 to the slope 8b of the cap forming the design surface. Also,
The semi-circular claw 9d fits in a ring-shaped groove 4 formed in the disk wheel 1 and having an arc-shaped cross section.

Next, a method of manufacturing the resin-made wheel ornament of the present invention will be described. FIG. 4 is a vertical cross-sectional view showing a combination state of a core mold and a slide mold of a resin mold used in the present invention, FIG. 5 is an enlarged perspective view of a shade portion of the core mold, and FIG. It is an expansion perspective view of a slide type.

The resin mold used in the present invention is a core mold 13
, A slide mold 16 and a cavity mold (not shown). The longitudinal sectional view showing the state of the combination of the core type and the slide type in FIG. 4 corresponds to the AA section in FIG. As shown in FIGS. 4 and 5, the core mold 13 is provided with a slide mold 16 (described later) on a slope 14 of the shade portion.
An E-shaped groove 15 having a depth reaching the upper surface of is formed vertically. By the E-shaped groove 15, a plate-shaped arc portion 9a forming the upper half of the arc-shaped holder 9, ribs 9b formed inward on both sides of the arc portion 9a, and outer wall surfaces of the arc portion are formed. The resin molding is performed without causing the problem of the undercut between the formed vertical ribs 9c.

The slide die 16 is for forming the lower half of the arc-shaped holder 9. As shown in FIGS. 4 and 6, the slide die 16 is mounted on the upper surface of the core die 13 by embedding. A projection 17 is provided on both sides of the end of the slide die 16, and a semicircular groove 18 is provided inside the projection 17 at intervals. In the semicircular groove 18, a semicircular claw 9 d is formed, and in the projection 17, the projection 17 passes through the lower half rib 9 b of the arc-shaped holder 9. The through hole is a recess 9e into which the wiring 10 is fitted.

Therefore, in the resin-made wheel ornament using the resin mold according to the present invention, the triangular undercut portion 12 formed between the inclined surface 8a of the wheel ornament 8 and the outer wall surface of the arc-shaped holder 9 and the circle An undercut in forming the semicircular claw 9d in the lower half of the arc-shaped holder 9 and the concave portion 9e of the rib 9b can be eliminated.

[0022]

According to the wheel ornament of the present invention, even if a wire ring type holder is attached to a resin-made wheel ornament formed in a shade shape, the problem of undercut does not occur at all during injection molding. Therefore, it has the following features as compared with the conventional metal holder system formed by cutting and raising a spring steel plate. (1) Since the present invention reinforces the claws of the holder by wire relining, it does not require a high-cost crystalline resin like a conventional product, and can use an inexpensive non-crystalline resin material. . (2) Since the resin-made arc-shaped holder of the present invention has extremely small dimensional variation as compared with the claws 21 of the conventional metal holder, the mounting performance is remarkably improved. (3) The method of manufacturing a resin-made wheel ornament according to the present invention is as follows.
5 is provided to form the upper half of the holder, and in the slide die 16, the projection 17 and the semicircular groove 18 are provided to form the lower half of the holder.
The problem of undercut can be solved with a simple mold structure.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a resin-made wheel ornament of the present invention.

FIG. 2 is a back view of the resin-made wheel ornament of the present invention.

FIG. 3 is an enlarged perspective view of an arc-shaped holder portion of the wheel ornament.

FIG. 4 is a longitudinal sectional view showing a combination of a core mold and a slide mold of a resin mold used in the present invention.

FIG. 5 is an enlarged perspective view of a core-shaped shade portion.

FIG. 6 is an enlarged perspective view of a slide type.

FIG. 7 is a longitudinal sectional view showing a mounting state of a conventional wheel ornament.

FIG. 8 is a rear view of a conventional wheel ornament.

FIG. 9 is a longitudinal sectional view of a conventional full wheel cap.

[Explanation of symbols]

1 disk wheel, 2 hub nut mounting part, 3 hub hole, 4 ring groove, 5 shelves, 6 disk wheel design surface, 7 hub, 8 wheel ornament, 8a top,
8b slope, 8c notch wall for hub nut escape,
9 Arc-shaped holder, 9a Plate-shaped arc, 9b, 9c
Rib, 9d semicircular claw, 9e recess, 10 wire ring, 12 undercut, 13 core type, 14 slope, 15 E-type groove, 16 slide type, 17 protrusion,
18 semicircular groove, 19 conventional wheel ornament, 20 base, 21 convex claw, 22 metal holder,
23 full wheel cap body, 24 spoon-shaped holder claw, 25 recess, 26 wire ring, 27 steel disc wheel.

Claims (2)

(57) [Claims] 1. A cap-like shape formed by a top portion 8a and a slope 8b.
Near the inside of the outer circumference of the back of the resin wheel ornament 8
Then, an arc-shaped holder 9 whose cross section is formed in a plate shape is suspended.
And the plate-shaped arc portion 9a of the arc-shaped holder 9 is provided
A longitudinal rib 9b is provided at the end toward the radial inside.
And a wiring 10 at the lower end of the rib 9b.
A concave portion 9e to be fitted is provided, and a longitudinal rib 9 is provided on an outer wall surface of the arc portion 9a.
c and a semicircular claw 9d is provided on the extension line below the rib 9c.
A wheel ornament made of resin. 2. A cap-like shape formed by a top portion 8a and a slope 8b.
Near the inside of the outer circumference of the back of the resin wheel ornament 8
Then, an arc-shaped holder 9 whose cross section is formed in a plate shape is suspended.
And the plate-shaped arc portion 9a of the arc-shaped holder 9 is provided
A longitudinal rib 9b is provided at the end toward the radial inside.
And a wiring 10 at the lower end of the rib 9b.
A concave portion 9e to be fitted is provided, and a longitudinal rib 9 is provided on an outer wall surface of the arc portion 9a.
c and a semicircular claw 9d is provided on the extension line below the rib 9c.
When the resin molding of the resin wheel ornament is performed, the plate-shaped arc is formed on the slope portion 14 of the core mold 13 and the cap-shaped portion.
Part 9a and the recesses formed inward on both sides of the arc part 9a.
9b and the vertical rib 9c formed on the outer wall surface of the arc portion.
E for forming the upper half of the circular arc-shaped holder 9 made of
A mold groove 15 is provided vertically, while a mold groove 15 is provided below the arc-shaped holder 9.
Both sides of slide die 16 end to form half
Is provided on the rib 9b in the lower half of the arc-shaped holder 9.
Forming a recess 9e into which the attached wiring 10 is fitted.
And a projection 17 for
A semi-circular groove 1 for forming a semi-circular claw 9d inside
8 and the slope 8a of the wheel ornament 8 and the circle
Triangular under that occurs between the outer wall surface of the arc-shaped holder 9
The semicircle of the cut portion 12 and the lower half of the arc-shaped holder 9
When forming the claw 9d and the recess 9e of the rib 9b.
It is characterized by being able to eliminate undercut
Manufacturing method of resin wheel ornaments.