U.S. patent application number 15/972704 was filed with the patent office on 2018-09-06 for heat and vibration mounting isolator for a heat shield, heat shield assembly and method of construction thereof.
The applicant listed for this patent is FEDERAL-MOGUL LLC. Invention is credited to JOHN HERALD, DAVID M. TOTH.
Application Number | 20180252292 15/972704 |
Document ID | / |
Family ID | 56024377 |
Filed Date | 2018-09-06 |
United States Patent
Application |
20180252292 |
Kind Code |
A1 |
HERALD; JOHN ; et
al. |
September 6, 2018 |
HEAT AND VIBRATION MOUNTING ISOLATOR FOR A HEAT SHIELD, HEAT SHIELD
ASSEMBLY AND METHOD OF CONSTRUCTION THEREOF
Abstract
An isolator for damping heat and vibrations between a heat
shield and heat source is provided. The isolator includes a housing
and a washer. The housing surrounds a center opening and extends
axially from a first end portion to a second end portion and
includes an intermediate portion therebetween. The housing has a
serpentine shape. The first end portion and the intermediate
portion of the housing clamp a washer therebetween, and the second
end portion and the intermediate portion of the housing clamp the
heat shield therebetween. The washer includes a plurality of
through openings between an outer periphery and the center opening
for enhancing vibration dampening and minimizing heat transfer from
the heat source to the heat shield. The isolator optionally
includes a collar member disposed along the center opening of the
washer to facilitate mounting of the isolator to the heat
source.
Inventors: |
HERALD; JOHN; (BRIGHTON,
MI) ; TOTH; DAVID M.; (CANTON, MI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
FEDERAL-MOGUL LLC |
Southfield |
MI |
US |
|
|
Family ID: |
56024377 |
Appl. No.: |
15/972704 |
Filed: |
May 7, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15134568 |
Apr 21, 2016 |
9964175 |
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15972704 |
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62260039 |
Nov 25, 2015 |
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62152730 |
Apr 24, 2015 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B23P 15/26 20130101;
F16F 15/06 20130101; F01N 2260/20 20130101; Y10T 428/24322
20150115; F01N 13/14 20130101; F01N 13/1838 20130101; F01N 3/20
20130101; F01N 13/1855 20130101; F01N 2450/24 20130101; Y10T
428/218 20150115; F01N 13/08 20130101; B21D 5/00 20130101 |
International
Class: |
F16F 15/06 20060101
F16F015/06; F01N 13/18 20060101 F01N013/18; B21D 5/00 20060101
B21D005/00; B23P 15/26 20060101 B23P015/26; F01N 13/14 20060101
F01N013/14 |
Claims
1. A method of manufacturing an isolator for damping heat and
vibrations between a heat shield and heat source, the method
comprising the step of: providing a washer extending radially from
an outer periphery to a center opening, the washer including a
plurality of through openings between the outer periphery and the
center opening for enhancing vibration dampening and minimizing
heat transfer from the heat source to the heat shield; providing a
housing surrounding a center opening, the housing extending from a
first end portion to a second end portion and including an
intermediate portion therebetween; bending the housing so that the
first end portion extends radially inwardly; disposing the outer
periphery of the washer between the first end portion and the
intermediate portion of the housing; and bending the housing so
that the second end portion extends radially outwardly to form an
annular pocket between the second end portion and the intermediate
portion, the second annular pocket facing away from the center
opening for receiving the heat shield.
2. A method of manufacturing a heat shield assembly, comprising the
steps of: providing a washer extending radially from an outer
periphery to a center opening for receiving a fastener to connect
the heat shield assembly to the heat source, the washer including a
plurality of through openings between the outer periphery and the
center opening for enhancing vibration dampening and minimizing
heat transfer from the heat source to the heat shield; providing a
housing surrounding a center opening, the housing extending from a
first end portion to a second end portion and including an
intermediate portion therebetween; bending the housing so that the
first end portion extends radially inwardly; disposing the outer
periphery of the washer between the first end portion and the
intermediate portion of the housing; bending the housing so that
the second end portion extends radially outwardly; and disposing an
inner periphery of a heat shield between the second end portion and
the intermediate portion of the housing.
3. An isolator for damping heat and vibrations between a heat
shield and heat source, the isolator comprising: a housing
surrounding a center opening, said housing extending axially from a
first end portion to a second end portion and including an
intermediate portion therebetween; said first end portion of said
housing extending radially inwardly to form a first annular pocket
between said first end portion and said intermediate portion, said
first annular pocket facing said center opening; said second end
portion of said housing extending radially outwardly to form a
second annular pocket between said second end portion and said
intermediate portion, said second annular pocket facing away from
said center opening for receiving the heat shield; a washer
extending radially from an outer periphery received in said first
annular pocket of said housing to said center opening for receiving
a fastener to connect the heat shield to the heat source; and said
washer including a plurality of through openings between said outer
periphery and said center opening with each of said through
openings having an arcuate shape for enhancing vibration dampening
and minimizing heat transfer from the heat source to the heat
shield.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This U.S. Divisional patent application claims priority to
U.S. Utility patent application Ser. No. 15/134,568, filed Apr. 21,
2016, which claims priority to U.S. Provisional Patent Application
No. 62/152,730, filed Apr. 24, 2015, and U.S. Provisional Patent
Application No. 62/260,039, filed Nov. 25, 2015, the entire
contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Technical Field
[0002] This invention relates generally to heat shields, and more
particularly to a mounting and vibration dampening apparatus for
mounting a heat shield.
2. Related Art
[0003] Vehicles and other equipment that operate via an internal
combustion engine contain various components that create extremely
high temperature heat. If left unchecked, the heat from the
components can have adverse affects on surrounding components. For
example, an automotive vehicle has an exhaust system including
exhaust pipes and catalytic converters which can reach temperatures
between 800-1200.degree. Fahrenheit (.degree. F.) or more. As such,
it is known to place a thermal barrier, often referred to simply as
a heat shield, adjacent the exhaust pipes and/or catalytic
converter to prevent radiant heat from impinging adjacent
components and from entering a passenger compartment of the
vehicle. In addition, heat shields are often used within an engine
compartment of the vehicle to prevent radiant heat from having
adverse affects on surrounding components, electrical lines, and
hoses, for example, wherein elevated temperatures are becoming more
commonplace due modern engine packages creating cramped
environments.
[0004] Accordingly, heat shields are becoming increasingly
important products for insulating the heat, sound and vibration of
automobile engines, electric generator engines, parts of exhaust
pipes, amongst numerous other applications. Such multi-functional
heat and vibration dampening shields must often fit into a
relatively small space while providing high performance to protect
the surrounding parts. Heat shields typically comprise one or more
layers of material that must be fixed and maintained in position by
a mounting bracket. The mounting bracket not only plays an
important role in fixing the heat shield in position, but is also
intended to inhibit the transfer of heat from the heat source to
the heat shield, as well as to dampen vibration. Known mounting
brackets can be complex in construction; relatively bulky and
heavy, which in turn adds cost and weight to the vehicle, and
further, can allow heat and vibration to affect the performance of
the vehicle. More so than ever, cost, weight and performance are
main concerns in the production of vehicles, and thus, improvements
to positively impact each concern are continually sought.
SUMMARY OF THE INVENTION
[0005] One aspect of the invention provides an isolator for damping
heat and vibrations between a heat shield and heat source without a
complex construction and without adding significant volume, cost,
or weight to the vehicle. The isolator includes a housing
surrounding a center opening and extending axially from a first end
portion to a second end portion and including an intermediate
portion therebetween. The first end portion of the housing extends
radially inwardly to form a first annular pocket between the first
end portion and the intermediate portion. The second end portion of
the housing extends radially outwardly to form a second annular
pocket between the second end portion and the intermediate portion.
The first annular pocket faces the center opening, and the second
annular pocket faces away from the center opening for receiving the
heat shield. A washer extends radially from an outer periphery
received in the first annular pocket of the housing to the center
opening for receiving a fastener to connect the heat shield to the
heat source. The washer also includes a plurality of through
openings between the outer periphery and the center opening for
enhancing vibration dampening and minimizing heat transfer from the
heat source to the heat shield.
[0006] Another aspect of the invention includes a heat shield
assembly for attachment to a heat source by a fastener. The
assembly comprises a heat shield including a through opening
presented by an inner periphery; and an isolator received in the
through opening of the heat shield for damping heat and vibrations
between the heat shield and the heat source. The isolator comprises
a housing surrounding a center opening, and the center opening is
axially aligned with the through opening of the heat shield. The
housing extends axially from a first end portion to a second end
portion and includes an intermediate portion therebetween. The
first end portion of the housing extends radially inwardly to form
a first annular pocket between the first end portion and the
intermediate portion. The second end portion of the housing extends
radially outwardly to form a second annular pocket between the
second end portion and the intermediate portion. The first annular
pocket faces the center opening, and the annular pocket faces away
from the center opening and receives the inner periphery of the
heat shield. A washer extending radially from an outer periphery
received in the first annular pocket of the housing to the center
opening for receiving the fastener to connect the heat shield to
the heat source. The washer includes a plurality of through
openings between the outer periphery and the center opening for
enhancing vibration dampening and minimizing transfer of heat from
the heat source to the heat shield.
[0007] A method of manufacturing an isolator for damping heat and
vibrations between a heat shield and heat source is also provided.
The method comprises the step of: providing a washer extending
radially from an outer periphery to a center opening, the washer
including a plurality of through openings between the outer
periphery and the center opening for enhancing vibration dampening
and minimizing heat transfer from the heat source to the heat
shield; and providing a housing surrounding a center opening, the
housing extending from a first end portion to a second end portion
and including an intermediate portion therebetween. The method
further includes bending the housing so that the first end portion
extends radially inwardly; disposing the outer periphery of the
washer between the first end portion and the intermediate portion
of the housing; and bending the housing so that the second end
portion extends radially outwardly to form an annular pocket
between the second end portion and the intermediate portion, the
second annular pocket facing away from the center opening for
receiving the heat shield.
[0008] The invention also provides a method of manufacturing a heat
shield assembly. The method includes providing a washer extending
radially from an outer periphery to a center opening for receiving
a fastener to connect the heat shield assembly to the heat source,
the washer including a plurality of through openings between the
outer periphery and the center opening for enhancing vibration
dampening and minimizing heat transfer from the heat source to the
heat shield; and providing a housing surrounding a center opening,
the housing extending from a first end portion to a second end
portion and including an intermediate portion therebetween. The
method further includes bending the housing so that the first end
portion extends radially inwardly; disposing the outer periphery of
the washer between the first end portion and the intermediate
portion of the housing; bending the housing so that the second end
portion extends radially outwardly; and disposing an inner
periphery of a heat shield between the second end portion and the
intermediate portion of the housing.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] These and other features and advantages of the present
invention will become more readily appreciated when considered in
connection with the following detailed description of presently
preferred embodiments and best mode, appended claims and
accompanying drawings, in which:
[0010] FIG. 1 is a an assembled, cross-sectional side view of a
heat shield assembly constructed according to one presently
preferred embodiment of the invention;
[0011] FIG. 2 is view similar to FIG. 1 of the heat shield assembly
in a partially assembled state;
[0012] FIG. 3 is a plan view of the heat shield assembly of FIG.
1;
[0013] FIG. 4 a plan view of a washer of a heat and vibration
mounting isolator of the heat shield assembly of FIG. 1;
[0014] FIG. 5A a perspective view of a heat and vibration mounting
isolator constructed in accordance with another aspect of the
invention;
[0015] FIG. 5B a perspective view of a washer of the heat and
vibration mounting isolator of FIG. 5A;
[0016] FIG. 6A a perspective view of a heat and vibration mounting
isolator constructed in accordance with yet another aspect of the
invention;
[0017] FIG. 6B a perspective view of a washer of the heat and
vibration mounting isolator of FIG. 6A;
[0018] FIG. 7A a perspective view of a heat and vibration mounting
isolator constructed in accordance with yet another aspect of the
invention;
[0019] FIG. 7B a perspective view of a washer of the heat and
vibration mounting isolator of FIG. 7A;
[0020] FIG. 8A is a top view of a heat and vibration mounting
isolator constructed in accordance with yet another aspect of the
invention;
[0021] FIG. 8B is a bottom view of the heat and vibration mounting
isolator of FIG. 8A;
[0022] FIG. 8C is a plan view of a washer of the heat and vibration
mounting isolator of FIG. 8A;
[0023] FIG. 9 is a plan view of a washer of a heat and vibration
mounting isolator constructed in accordance with another aspect of
the invention;
[0024] FIG. 10A is a top view of a heat and vibration mounting
isolator constructed in accordance with yet another aspect of the
invention;
[0025] FIG. 10B is a bottom view of the heat and vibration mounting
isolator of FIG. 10A;
[0026] FIG. 10C is a plan view of a washer of the heat and
vibration mounting isolator of FIG. 10A;
[0027] FIG. 11A is a top view of a heat and vibration mounting
isolator constructed in accordance with yet another aspect of the
invention;
[0028] FIG. 11B is a bottom view of the heat and vibration mounting
isolator of FIG. 11A;
[0029] FIG. 11C is a plan view of a washer of the heat and
vibration mounting isolator of FIG. 11A;
[0030] FIG. 12 is a perspective view of a washer of a heat and
vibration mounting isolator constructed in accordance with another
aspect of the invention;
[0031] FIG. 13 is a top view of a washer including a non-circular
inner diameter presenting a center opening constructed in
accordance with another aspect of the invention;
[0032] FIG. 14 is a perspective view of the washer of FIG. 13;
[0033] FIG. 15 is a perspective view of a heat and vibration
mounting isolator including the washer of FIG. 13;
[0034] FIG. 16 is a cross-sectional side view of a heat and
vibration mounting isolator constructed according to another
embodiment, wherein the washer includes a bead, and a fastener is
shown for attachment to a heat source;
[0035] FIG. 17 is a cross-sectional side view of another example
heat and vibration mounting isolator including a collar member
along a center opening of the washer;
[0036] FIG. 18 is a perspective view of a portion of a heat and
vibration mounting isolator including the collar member;
[0037] FIG. 19 is a cross-sectional side view of a heat and
vibration mounting isolator including the collar member and a bead
in the washer;
[0038] FIG. 20 is a perspective view of a portion of a heat and
vibration mounting isolator including another bead profile in the
washer;
[0039] FIG. 21 illustrates a heat and vibration mounting isolator
including the collar member; illustrate
[0040] FIGS. 22 and 23 illustrate the heat and vibration mounting
isolator of FIG. 21 attached to a heat shield; and
[0041] FIG. 24 is a perspective view of a portion of a heat and
vibration mounting isolator including a single piece collar
member.
DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS
[0042] Referring in more detail to the drawings, FIG. 1-3 (FIG. 2
is partially assembled) show a heat shield assembly, referred to
hereafter as assembly 10, constructed in accordance with one
presently preferred embodiment of the invention. The assembly 10 is
constructed to enhance sound insulation in a manner of vibration
dampening, to minimize weight, to minimize conductivity of heat
from a heat source throughout the assembly 10, and to occupy as
small an envelope as possible. The assembly 10 has a broad array of
applicable uses, such as in vehicles having internal combustion
engines, construction machinery, and agricultural machinery, by way
of example and without limitation. Further, the assembly 10 is
economical in manufacture and in assembly and exhibits a long life
in use.
[0043] The assembly 10 includes a heat shield 12 and a heat and
vibration mounting isolator, referred to hereafter as isolator 14,
fixed to one another. The heat shield 12 can be constructed from
one or more layers of material, as desired, and can take on any
size, shape and configuration, as desired for the intended
application. The heat shield 12 if provided with a through opening
16 that is bounded by an inner periphery 18 to facilitate fixing
the isolator 14 thereto. The isolator 14 includes a washer 20 and
an annular housing 22, also referred to as a strainer. The washer
20 has an outer periphery 24 and a center opening 26 extending
about a central axis 28. The annular housing 22 extends about the
central axis 28 through the through opening 16 of the heat shield
12. The annular housing 22 has opposite first and second end
portions 30, 32 and an intermediate portion 34 extending between
the first and second end portions 30, 32. The first end portion 30
is curled radially inwardly toward the central axis 28 in overlying
relation with the intermediate portion 34 to form a first annular
pocket 36 opening toward the central axis 28. The first annular
pocket 36 is bounded on opposite sides by the intermediate portion
34 and the first end portion 30, and the outer periphery 24 of the
washer 20 clamped or in other words sandwiched between the first
end portion 30 and the intermediate portion 34 and fixed in the
first annular pocket 36. The second end portion 32 is curled
radially outwardly away from the central axis 28 in overlying
relation with the intermediate portion 34 to form a second annular
pocket 38 opening away from the central axis 28. The second annular
pocket 38 is bounded on opposite sides by the intermediate portion
34 and the second end portion 32, and the inner periphery 18 of the
heat shield 12 is clamped or in other words sandwiched between the
second end portion 32 and the intermediate portion 34 and is fixed
in the second annular pocket 38. As such, the heat shield 12 and
isolator 14 are permanently fixed to one another. The washer 20 of
the heat shield assembly 10 is then attached to the heat source,
such as the exhaust pipe or catalytic converter, by a fastener 42.
The fastener 42 can be a bolt, a screw, or another type of
fastening device. Preferably, the washer 20 is at zero mean stress
and will have an applied load under vibration that modulates above
and below this mean. The washer 20 is typically close to a flat
profile, which helps to maximum the strength of the metal material
used to form the washer 20, due to the material not being worked to
form its shape. A high yield strength of the washer 20 maximizes
fatigue life.
[0044] The washer 20 of the heat shield assembly 10 is preferably
constructed of steel, and more preferably stainless steel; however,
it is contemplated that other metals could be used, such as
aluminum, for example. The washer 20 can be provided with a
plurality of through openings 40 between the outer periphery 24 and
the center opening 26 to enhance vibration dampening, to minimize
weight, and to minimize conductivity of the washer 20 to minimize
the transfer of heat from a heat source to the heat shield 12, such
as via the fastener 42 that fastens the assembly 10 to a mount
location on or adjacent the heat source, such as to portions of an
exhaust system, for example. It should be recognized that the
through openings 40 can be formed having any number of shapes and
sizes, such as demonstrated in alternate embodiments constructed in
accordance with the invention illustrated in FIGS. 5-12, wherein
the same reference numerals, offset by factors in increments of
100's, are used to identify like features.
[0045] In the examples of FIGS. 1-12, the washer 20 presents a
circular inner diameter defining the center opening 26. However,
the washer 20 could alternatively include a non-circular inner
diameter defining the center opening 26. For example, the washer 20
could include a plurality of tabs 41 surrounding and defining the
center opening 26, wherein each tab 41 is spaced from the adjacent
tab by a groove 43. FIGS. 13 and 14 illustrate an example of the
washer 20 including the tabs 41 and grooves 43 defining the
non-circular inner diameter. FIG. 15 illustrates the washer 20 with
the non-circular inner diameter disposed between other components
of the heat shield assembly 10.
[0046] In the examples of FIGS. 3 and 4, the washer 20 includes a
center ring formed of metal material surrounding the circular or
non-circular center opening 26, and a plurality of rows of through
openings 40 disposed radially outwardly of the center ring. Each
through opening 40 extends circumferentially along a portion of the
washer 20 and is circumferentially spaced from the adjacent through
opening 40 by a spoke formed of the metal material. Each row of
through openings 40 is radially spaced from the adjacent row by
another ring of the metal material. In the embodiment of FIGS. 3
and 4, the washer 20 includes three rows of through openings 40,
and each row includes five through openings 40 and five spokes. The
circumferential length of each spoke is much less than the
circumferential length of each through opening 40.
[0047] The washer 20 can be constructed having any desired
thickness, as needed for the intended application, and can be
planar, substantially planar, or can include at least one bead 44,
also referred to as a stepped region, as shown in FIGS. 16, 19, and
20. The outer periphery 24 of the washer 20 can be formed as being
circular or non-circular, symmetrical or non-symmetrical to best
enhance vibration dampening, to minimize weight, and to minimize
conductivity of the washer. For example, the washers depicted in
FIGS. 9 and 10C include radially outwardly extending ears or tabs
46 of differing configurations, wherein the ears 46 are
substantially the only portion of the washer clamped or sandwiched
between the first end portion 30 and intermediate portion 34 of the
housing 22, thereby further diminishing the conductive path between
the fastener 42, the washer 20 and the housing 22, thereby reducing
the potential of heat transfer therebetween. Further, as shown in
FIG. 12, the through openings 40 can be provided as partially
punched openings, thereby having tangs 48 of material remaining
attached to the body of the washer 20. The tangs 48 can start from
the inner diameter, outer diameter, or another position along the
washer 20, and the number of tangs 48 is not limited to the number
of through openings 40. The tangs 48 can also be circumferential,
radial, or a combination of both, and are not limited to a planar
surface. If provided, the tangs 48 can promote further dampening
and can enhance the stiffness of the washer 20, wherein the tangs
48 can be formed to attain any desired size, shape, orientation and
angle of inclination.
[0048] The housing 22 of the heat shield assembly 10 is preferably
constructed of aluminum; however, it is contemplated that other
metals could be used, such as various forms of steel, for example.
The housing 22 can be formed being generally serpentine in axial
cross-section, and depending on the view, either s or z-shaped, to
minimize the envelope occupied by the housing 22 and to facilitate
fixing the housing 22 to the washer 20 and the heat shield 12. The
serpentine shape is formed as a result of the first end portion 30,
the second end portion 32 and the intermediate portion 34 being
folded in stacked, overlying relation with one another, much like
an accordion.
[0049] According to other example embodiments shown in FIGS. 15-24,
the heat shield assembly 10 includes a collar member 50 along the
centeropening 26 of the washer 20 to facilitate mounting of the
assembly 10 to the heat source and further reduce the transfer of
heat and vibrations from the heat source 10 to the heat shield 12.
In the embodiments shown in FIGS. 15-24, the collar member 50
includes an upper collar 52 and a lower collar 54 maintaining the
washer 20 therebetween. The upper collar 52 includes an inner neck
56 extending longitudinally along the center opening 26. The upper
collar 52 then extends radially outward from the inner neck 56
along an upper surface of the washer 20. The lower collar 54 also
includes an outer neck 58 extending longitudinally along the center
opening 26. The lower collar 54 then extends radially outward from
the outer neck 58 along a lower surface of the washer 20. The outer
neck 58 is disposed radially outwardly of the inner neck 56. An
outermost radial end of the upper collar 52 is approximately
longitudinally aligned with an outermost radial end of the lower
collar 54. Typically, there is some space between the washer 20 and
the collar member 50, in the axial and/or radial direction, such
that the washer 20 floats between the upper and lower collars 52,
54. In the embodiments of FIGS. 15-23, the upper and lower collars
52, 54 are separate pieces. Alternatively, the collar member 50 can
comprise a single piece including both the upper and lower collars
52, 54, as shown in FIG. 24.
[0050] In the embodiments including the collar member 50, the
washer 20 can include the bead 44, or a plurality of beads 44, to
control the resistance of float of the collars 52, 54 relative to
the clamped washer 20, so that the heat shield assembly 10 is
easier to align and attach to the heat source. However, the beads
44 can also be used in embodiments without the collar member 50.
The bead 44 minimizes thermal conduction, thus increasing thermal
insulating efficiency of the assembly 10. The beads 44 can comprise
a stepped profile, as shown in FIGS. 16 and 19, or a dome profile,
as shown in FIG. 20. The dome-shaped beads 44 can be radially and
circumferentially spaced from one another along the washer 20.
Although only a couple bead profiles are shown, the bead 44 or
beads can alternatively comprise other profiles, For example, the
washer 20 can include a plurality of angularly, circumferentially
spaced beads 44. The bead 44 can also be provided in the form of a
rib. A bead 44 either circumferentially or radially shaped, or a
combination thereof, creates a stiffness change in the washer 20
and thus enables fine tuning of the design.
[0051] The heat shield assembly 10 can also include a thermally
resistant coating applied to the washer 20 to improve insulation
and thus reduce heat transfer from the heat source to the heat
shield 12. For example, a ceramic coating can be applied to the
washer 20.
[0052] In accordance with another aspect of the invention, a method
of constructing a heat shield assembly 10 is provided. The method
includes providing a heat shield 12 having a through opening 16
bounded by an inner periphery 18; providing a washer 20 having an
outer periphery 24 and a center opening 26 extending about a
central axis 28, and providing an annular housing 22 having
opposite first and second end portions 30, 32 and an intermediate
portion 34 extending between the first and second end portions 30,
32. The method further includes curling the first end portion 30 of
the housing 22 radially inwardly toward the central axis 28 in
overlying relation with the intermediate portion 34 to form a first
annular pocket 36 opening toward the central axis 28 and fixedly
capturing the outer periphery 24 of the washer 20 in the first
annular pocket 36. The method also includes curling the second end
portion 32 radially outwardly away from the central axis 28 in
overlying relation with the intermediate portion 34 to form a
second annular pocket 38 opening away from the central axis 28 and
fixedly capturing the inner periphery 18 of the heat shield 12 in
the second annular pocket 38.
[0053] To form the assembly 10 of FIGS. 15-24, the method further
includes disposing the washer 20 between the upper and lower
collars 52, 54, either before or after clamping the housing 22 onto
the washer 20. When the collar member 50 includes the separate
upper and lower collars 52, 54, opposed to a single piece design,
the method also includes fixing the collars 52, 54 to one
another.
[0054] Obviously, many modifications and variations of the present
invention are possible in light of the above teachings. It is,
therefore, to be understood that the invention may be practiced
otherwise than as specifically described while still being within
the scope of the invention.
* * * * *