U.S. patent application number 15/649710 was filed with the patent office on 2019-01-17 for automotive ditch molding.
The applicant listed for this patent is Ford Global Technologies, LLC. Invention is credited to Paul Kenneth Dellock, David Lee Jarvis, Talat Karmo, Joseph Myszka, Stuart C. Salter.
Application Number | 20190016276 15/649710 |
Document ID | / |
Family ID | 63450658 |
Filed Date | 2019-01-17 |
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United States Patent
Application |
20190016276 |
Kind Code |
A1 |
Karmo; Talat ; et
al. |
January 17, 2019 |
AUTOMOTIVE DITCH MOLDING
Abstract
A disclosed roof ditch molding includes a base including side
portions extending from a central portion, an outer surface and an
over-mold disposed over the outer surface. The over-mold defines
first and second lips that extend downward transversely from the
side portions of the base.
Inventors: |
Karmo; Talat; (Waterford,
MI) ; Jarvis; David Lee; (Madison Heights, MI)
; Dellock; Paul Kenneth; (Northville, MI) ;
Salter; Stuart C.; (White Lake, MI) ; Myszka;
Joseph; (Livonia, MI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Ford Global Technologies, LLC |
Dearborn |
MI |
US |
|
|
Family ID: |
63450658 |
Appl. No.: |
15/649710 |
Filed: |
July 14, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B60R 13/06 20130101;
B60R 13/04 20130101; B60R 13/00 20130101; B60J 10/00 20130101; B60R
13/0206 20130101; B62D 25/06 20130101; B62D 25/07 20130101 |
International
Class: |
B60R 13/04 20060101
B60R013/04; B60R 13/02 20060101 B60R013/02; B62D 25/06 20060101
B62D025/06 |
Claims
1. A roof ditch molding comprising: a base including side portions
extending from a central portion and an outer surface wherein the
base includes grooves extending longitudinally along the outer
surface; and an over-mold disposed over the outer surface of the
base with a portion that fills the grooves, the over-mold defining
first and second lips that extend away from the base transversely
from the side portions of the base.
2. (canceled)
3. The roof ditch molding as recited in claim 1, wherein the
grooves extend into a thickness of the base and the over-mold
extends into the grooves from the outer surface toward an inner
surface of the base.
4. The roof ditch molding as recited in claim 1, wherein the
over-mold further includes a flange extending from one of the side
portions.
5. The roof ditch molding as recited in claim 1, wherein the
over-mold further includes a tab extending outward from each of the
side portions.
6. The roof ditch molding as recited in claim 1, wherein the base
includes between 6% and 18% by weight of carbon fiber.
7. The roof ditch molding as recited in claim 6, wherein the base
includes between 38% and 43% by weight of a virgin copolymer
polypropylene.
8. The roof ditch molding as recited in claim 7, wherein the base
includes between 30% and 42% by weight of a recycled copolymer
polypropylene.
9. The roof ditch molding as recited in claim 8, wherein the base
includes between 6% and 8% by weight of a synthetic filler.
10. The roof ditch molding as recited in claim 1, wherein the base
has a wall thickness between 1.5 mm and 3.5 mm.
11. The roof ditch molding as recited in claim 1, wherein the base
has a density between 0.95 (g/cm.sup.3) and 1.20 (g/cm.sup.3).
12. The roof ditch molding as recited in claim 1, wherein the base
has a Flex Modulus of between 3,250 Mpa and 8,750 Mpa.
13-18. (canceled)
Description
TECHNICAL FIELD
[0001] This disclosure relates to an automotive roof ditch molding
and method of manufacture.
BACKGROUND
[0002] Vehicle roofs include a channel referred to as a "ditch"
that provides for drainage. A molding is secured within the channel
to protect the vehicle roof and aid in draining water. The molding
secured within the channel is commonly known as a ditch molding and
typically is formed as a rigid cross-section covered by a more
flexible material. Foam blocks are included between the roof ditch
and the molding to provide a secure fit. Automotive manufactures
continually seek improved efficiencies in part weight, cost and
manufacturability.
SUMMARY
[0003] An apparatus according to an exemplary aspect of the present
disclosure includes, among other things, a roof ditch molding
including a base with side portions extending from a central
portion and an outer surface with an over-mold disposed over the
outer surface of the base. The over-mold defines first and second
lips that extend transversely from the side portions of the
base.
[0004] In a further non-limiting embodiment of the foregoing roof
ditch molding, the base includes grooves longitudinally along the
outer surface and a portion of the over-mold fills the grooves.
[0005] In a further non-limiting embodiment of the foregoing roof
ditch molding, the grooves extend into a thickness of the base and
the over-mold extends into the grooves from the outer surface
toward an inner surface of the base.
[0006] In a further non-limiting embodiment of the foregoing roof
ditch molding, the over-mold further includes a flange extending
from one of the side portions.
[0007] In a further non-limiting embodiment of the foregoing roof
ditch molding, the over-mold further includes a tab extending
outward from each of the side portions.
[0008] In a further non-limiting embodiment of the foregoing roof
ditch molding, the base includes between 6% and 18% by weight of
carbon fiber.
[0009] In a further non-limiting embodiment of the foregoing roof
ditch molding, the base comprises between 38% and 43% by weight of
a virgin copolymer polypropylene.
[0010] In a further non-limiting embodiment of the foregoing roof
ditch molding, the base comprises between 30% and 42% by weight of
a recycled copolymer polypropylene.
[0011] In a further non-limiting embodiment of the foregoing roof
ditch molding, the base includes between 6% and 8% by weight of a
synthetic filler.
[0012] In a further non-limiting embodiment of the foregoing roof
ditch molding, the base has a wall thickness between 1.5 mm and 3.5
mm.
[0013] In a further non-limiting embodiment of the foregoing roof
ditch molding, the base has a density between 0.95 (g/cm.sup.3) and
1.20 (g/cm.sup.3).
[0014] In a further non-limiting embodiment of the foregoing roof
ditch molding, the base has a Flex Modulus of between 3,250 Mpa and
8,750 Mpa.
[0015] A method according to another exemplary aspect of the
present disclosure includes, among other things, a process for
fabricating a roof ditch molding including extruding a base having
a cross-section with side portions extending from a central portion
and an outer surface, communicating the extruded base to a
co-extrusion die, extruding an over-mold at least partially about
the outer surface of the base to define an extruded section, and
cutting the extruded section to a desired length.
[0016] In a further non-limiting embodiment of any of the foregoing
processes for fabricating a roof ditch molding including extruding
the over-mold to have first and second lips that extend
transversely from the side portions of the base.
[0017] In a further non-limiting embodiment of any of the foregoing
processes for fabricating a roof ditch molding including extruding
the base to have grooves extending longitudinally along the outer
surface of the base portion and filling the grooves with the
over-mold from the outer surface of the base to an inner surface of
the base.
[0018] In a further non-limiting embodiment of any of the foregoing
processes for fabricating a roof ditch molding including extruding
the over-mold to include a flange extending from one of the side
portions of the base.
[0019] In a further non-limiting embodiment of any of the foregoing
processes for fabricating a roof ditch molding including extruding
the base to include between 6% and 18% by weight of carbon fiber,
between 38% and 43% by weight of a virgin copolymer polypropylene,
between 30% and 42% by weight of a recycled copolymer polypropylene
and between 6% and 8% by weight of a synthetic filler.
[0020] In a further non-limiting embodiment of any of the foregoing
processes for fabricating a roof ditch molding including extruding
the base to include a wall thickness between 1.5 mm and 3.5 mm.
[0021] The various features and advantages of this disclosure will
become apparent to those skilled in the art from the following
detailed description. The drawings that accompany the detailed
description can be briefly described as follows.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] FIG. 1 is a schematic view of an example roof ditch and
molding.
[0023] FIG. 2 is a cross-sectional view of an example roof ditch
and molding.
[0024] FIG. 3 is a cross-section of the example roof ditch
molding.
[0025] FIG. 4 is a top view of an example roof ditch molding.
[0026] FIG. 5 is a cross-sectional view of a base of the example
roof ditch molding.
[0027] FIG. 6 is a schematic view of an example process for
fabricating a roof ditch molding.
DETAILED DESCRIPTION
[0028] Referring to FIGS. 1 and 2, an automotive vehicle may
include a roof 12 that includes a channel referred to as a roof
ditch 10. The roof ditch 10 is a channel within the roof that
directs water away from sides of the vehicle and may also include
the attachment weld securing roof to the vehicle. A ditch molding
14 covers the roof ditch 10 and provides a desired aesthetic
appearance. The roof ditch 10 includes a bottom surface 11 and side
surfaces 15. The ditch molding 14 includes sealing features that
seat against the bottom surface 11 and side surface 15 of the roof
ditch 10 to direct water in a desired direction.
[0029] The example ditch molding 14 includes a base 16 covered with
an over-mold 28. The ditch molding 14 is secured within the ditch
10 by clips 42 that attach to anchors 44 provided within the roof
ditch 10. The ditch molding 14 may also include end caps 40 at each
exposed end or may abut into other features of the automotive
vehicle roof and thereby not require the end caps 40.
[0030] Referring to FIGS. 3, 4 and 5 with continued reference to
FIG. 1, the example ditch molding 14 is shown in cross-section and
includes the base 16 formed from a polypropylene copolymer blend.
The over-mold 28 is coextruded with the base 16 and surrounds
substantially an entire outer surface 24 of the base 16.
[0031] The example base 16 includes a center portion 20 and two
side portions 22. The base 16 forms a generally c-shaped
cross-section with the end portions 22 extending transversely from
the center portion 20. The side portions 22 include a bottom
portion that curves inwardly towards each other. The center portion
20 includes several grooves 18 that extend into a thickness 46 of
the base 16. The thickness 46 of the base 16 along with the grooves
are configured to provide sufficient compliance in the base 16 to
conform to the sweeps, curves and contours of the roof 12. The
thickness 46 of the base 16 in one disclosed embodiment is between
1.50 mm (0.06 in) and 3.50 mm (0.14 in). In another disclosed
embodiment, the thickness 46 is about 1.76 mm (0.7 in). In another
disclosed embodiment, the thickness 46 is about 1.98 mm (0.08 in).
In yet another disclosed embodiment the thickness 46 is about 3.00
mm (0.12 in). It should be appreciated that other thickness
providing sufficient compliance in the base 16 are within the
contemplation of this disclosure.
[0032] The over-mold 28 is molded onto the outer surface 24 of the
base 16 and includes transversely extending first and second lips
30, 32. The first and second lips 30, 32 extend transversely
downward from each side portion 22 of the base 16. The first and
second lips 30, 32 extend downwardly when installed within the roof
ditch 10 to contact the bottom surface 11 of the roof ditch 10. In
the disclosed example, the lips 30, 32 extend downwardly from each
of the side portions 22 and are parallel to each other across the
open part of the C-shaped base 16. The contact between the lips 30,
32 and the bottom surface 11 of the roof ditch 10 provide a
desirable firm solid fit and feel when installed.
[0033] The over-mold 28 also includes a side extending flange 34 on
one side that engages one of the side surfaces 15 of the roof ditch
10. The over-mold 28 further includes tabs 36 on each side that are
substantially of a same size and configuration and further aid in
providing sealing contact with the side surface 15 of the roof
ditch 10. The first lip 30, second lip 32, flange 34 and tabs 36
extend the entire longitudinal length of the ditch molding 14.
[0034] The over-mold 28 is molded to the base 16 such that portions
38 of the over-mold 28 extend through the grooves 18. The portions
38 of the over-mold 28 extend into the grooves 18 from the outer
surface 24 of the base 16 toward the inner surface 26 of the base
16. The grooves 18 extend longitudinally the length of the ditch
molding 14. The grooves provide a desired compliance in the base 16
that enables flexing side to side and along the length to conform
to curves and contours of the automotive roof 12 and roof ditch 10.
Although four grooves 18 are shown, other numbers of grooves 18
could be utilized to provide sufficient compliance in the base 16
to conform to the shape of the roof 12.
[0035] Referring to FIG. 6 with continued reference to FIG. 3, the
example ditch molding 14 is fabricated using a coextruding process
schematically illustrated at 80. The disclosed co-extrusion process
extrudes the base 16 from a base material 50 utilizing a main
extruder 66. The main extruder 66 pushes the base material 50 out
into a co-extrusion die 70. In the co-extrusion die 70 the
over-mold 28 is formed from an over-mold material 76 through a soft
extruder 68.
[0036] The output from the co-extrusion die 70 is a continuous
length of the cross-section as shown in FIG. 3 of the ditch molding
14 and schematically illustrated in FIG. 6 at 78. The continuous
length of the ditch molding 14 is communicated from the
co-extrusion die 70 into a water bath 72. In the water bath 72 that
continuous length of the co-extrusion 78 is cooled as is
schematically indicated at 82.
[0037] The cooled continuous ditch molding member 78 is then
directed to a cutting station schematically illustrated at 84 where
the continuous length of ditch molding 78 is cut into desired
lengths 88. The cut ditch moldings 14 are then ready for assembly
to the automotive roof 12 without further processing. It should be
appreciated that the cross-section of the ditch molding 14 enables
flexing in both the side to side direction but also longitudinally
such that additional processing steps are not required. The down
extending lips 30, 32 engage the bottom surface 11 of the roof
ditch 10 to provide a firm desirable fit and finish without
additional blocking or structures.
[0038] The ditch moldings 14 may than be assembled directly to the
vehicle roof 12 as is illustrated at 86 they are assembled to the
automotive roof 12 and specifically within the automotive ditch 10.
The assembly step schematically illustrated at 86 includes securing
the ditch molding 14 within the roof ditch 10 with the clips 42.
The clips 42 are secured with the roof ditch 10 and provide a snap
fit attachment of the ditch molding 14. The clips 42 are shown
schematically and may include any known clip configuration.
Optionally illustrated is assembly of end caps 40 to the ditch
molding 14 for applications that require finishing of the ends of
the ditch molding. In some applications, the ends of the roof ditch
molding 14 are hidden by other roof structures that then do not
require the end caps 40. Moreover, other structures as are known
for concealing ends of the roof ditch 10 are within the
contemplation of this disclosure.
[0039] Additionally, although it is disclosed as a single length of
roof ditch molding 14 being assembled into the roof ditch 10,
multiple discrete lengths may also be used to correspond with other
structures secured within the roof ditch 14 and are within the
contemplation of this disclosure.
[0040] The example base material 50 is a polypropylene copolymer
that is formulated to provide a defined density and flex modulus
corresponding with the wall thickness 46 of the base 16. The base
material schematically shown at 50 includes components
schematically shown in FIG. 6 that include virgin copolymer
polypropylene 52, recycled polypropylene copolymer 54, a low
density color concentrate 56, a stabilizer 58, a coupling agent 60,
a synthetic filler 62 and carbon fiber 64 in defined formulations
to provide the desired material properties. Three example disclosed
formulations are defined in Table 1 below. Each component for the
example formulations of the base material 50 are defined as a
percentage by weight relative to the total weight in Table 1
provided below.
TABLE-US-00001 PP COPOLYMER FORMULATIONS OF THE BASE MATERIAL
Formula 2 Formula 3 Formula 4 Filler 7% Carbon 11% Carbon 15%
Carbon Fiber Fiber Fiber Bio & Bio & Bio & Synthetic
Synthetic Synthetic Fillers Fillers Fillers Density (g/cm3) 0.98
1.00 1.10 Wall Thickness 3 1.98 1.76 (mm) Flex Modulus 3,500 6,000
8,500 (Mpa) Virgin Copolymer 41.10% 39.10% 42.10% Poly Propylene
Recycled PP 41.60% 39.10% 31.10% Copolymer Polymer Low Density
Color 1.50% 1.50% 1.50% Concentrate Stabilizer 0.75% 0.75% 0.75%
Coupling Agent 1.50% 1.50% 1.50% (based on Maleic Anhydride)
Synthetic Filler 7.05% 7.05% 7.05% Carbon Fiber 7.00% 11.00%
15.00%
[0041] The example base material 50 formulations utilize a
combination of virgin and recycled polypropylene to provide a
defined increase in the flexural capacity of the roof ditch molding
14 while increasing the tensile elongation of the material and
maintaining a lower density to reduce overall weight.
[0042] The disclosed base material 50 formulations provide a
defined flex modulus between about 3,250 Mpa and 8,750 Mpa. The
disclosed base material 50 formulations also include a density
within a range between 0.95 g/cm.sup.3 (0.034 lb/in.sup.3) and 1.20
g/cm.sup.3 (0.043 lb/in.sup.3). The flex modulus results at least
partially from a combination of the density of the base material
and the wall thickness 46 of the base 16. In one disclosed material
embodiment, the base includes a wall thickness of 3 mm (0.12 in)
and a density of 0.98 g/cm.sup.3 (0.035 lb/in.sup.3) to provide a
flex modulus of 3,500 Mpa. In another disclosed material
embodiment, the base includes a wall thickness of 1.98 mm (0.08 in)
and a density of 1.00 g/cm.sup.3 (0.036 lb/in.sup.3) to provide a
flex modulus of 6,000 Mpa. In another disclosed material
embodiment, the base includes a wall thickness of 1.76 mm (0.7 in)
and a density of 1.10 g/cm.sup.3 (0.040 lb/in.sup.3) to provide a
flex modulus of 8,500 Mpa.
[0043] In one disclosed example formulation, the base 16 includes
between 6% and 18% by weight of carbon fiber. In another disclosed
embodiment, the base includes about 7.00% by weight of carbon
fiber. In yet another disclosed embodiment, the base includes about
11.00% by weight of carbon fiber. In yet another disclosed
embodiment, the base includes about 15.00% by weight of carbon
fiber.
[0044] In one disclosed example formulation the base comprises
between 38% and 43% by weight of a virgin copolymer polypropylene.
In another disclosed example formulation the base comprises about
39.10% by weight of a virgin copolymer polypropylene. In another
disclosed example formulation the base comprises about 41.10% by
weight of a virgin copolymer polypropylene. In another disclosed
example formulation the base comprises about 42.10% by weight of a
virgin copolymer polypropylene.
[0045] In one example formulation, the base 16 includes between 30%
and 42% by weight of a recycled copolymer polypropylene. In another
example formulation, the base 16 includes about 39.10% by weight of
a recycled copolymer polypropylene. In another example formulation,
the base 16 includes about 31.10% by weight of a recycled copolymer
polypropylene. In another example formulation, the base 16 includes
about 42.60% by weight of a recycled copolymer polypropylene.
[0046] In one example formulation, the base 16 includes between 6%
and 8% by weight of a synthetic filler. In another example
formulation, the base 16 includes about 7.05% by weight of the
synthetic filler.
[0047] In one disclosed example embodiment, the carbon fibers are
recycled and are of a length between about 6 and 12 mm. It should
be understood that other lengths of carbon fiber as well as the use
of virgin material are within the contemplation of this
disclosure.
[0048] In one disclosed example, the synthetic filler 62 is used to
improve cost and improve material properties. In one disclosed
example, the synthetic filler 62 comprises a magnesium oxysulfate.
The filler 62 is added to reduce the coefficient of linear thermal
expansion of the ditch molding 14 and increase material
stiffness.
[0049] It should be appreciated, that the disclosed example
formations include approximate percentages by weight for each
component that may vary according to known tolerances for plastic
material. Moreover, it is within the contemplation of this
disclosure that other base material formulations could be utilized
within the scope of this disclosure.
[0050] The example over-mold material 76 is a thermal plastic
vulcanisate (TPV) that has a stiffness between 50 and 90 Shore A.
The over-mold material 76 is used to cover and seal the base 16.
Moreover, the over-mold material 76 is used to provide a desired
texture and color of the completed ditch molding 14 that
corresponds with the automotive roof and a desired aesthetic
appearance. Other over-mold materials may be utilized that provide
the defined flexibility and aesthetic appearance desired that are
also compatible with the base material 50.
[0051] Accordingly, the disclosed example ditch molding 14 includes
an overall cross-sectional shape defined by the base 16 and
over-mold 28 that is sufficiently flexible to conform to contours
of an automotive roof structure while maintaining a defined
stiffness. The ditch molding 14 includes features that eliminate
the need for additional support structures and blocks.
Additionally, the base 16 is fabricated utilizing a base material
50 that incorporates carbon fibers and filler materials according
to discloses formulations that provide the desired material
properties that provide flexibility and stiffness.
[0052] Although the different non-limiting embodiments are
illustrated as having specific components or steps, the embodiments
of this disclosure are not limited to those particular
combinations. It is possible to use some of the components or
features from any of the non-limiting embodiments in combination
with features or components from any of the other non-limiting
embodiments.
[0053] It should be understood that like reference numerals
identify corresponding or similar elements throughout the several
drawings. It should be understood that although a particular
component arrangement is disclosed and illustrated in these
exemplary embodiments, other arrangements could also benefit from
the teachings of this disclosure.
[0054] The foregoing description shall be interpreted as
illustrative and not in any limiting sense. A worker of ordinary
skill in the art would understand that certain modifications could
come within the scope of this disclosure. For these reasons, the
following claims should be studied to determine the true scope and
content of this disclosure.
* * * * *