U.S. patent application number 15/045940 was filed with the patent office on 2017-08-17 for stud assembly.
This patent application is currently assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC. The applicant listed for this patent is GM GLOBAL TECHNOLOGY OPERATIONS LLC. Invention is credited to Jason M. Miller, David B. Waskie.
Application Number | 20170232830 15/045940 |
Document ID | / |
Family ID | 59410350 |
Filed Date | 2017-08-17 |
United States Patent
Application |
20170232830 |
Kind Code |
A1 |
Waskie; David B. ; et
al. |
August 17, 2017 |
STUD ASSEMBLY
Abstract
A stud assembly is coupled between an underhood propulsion
system and an underhood cover in order to manage energy from an
external force applied to the underhood cover. The underhood cover
is coupled over the underhood propulsion system. The stud assembly
is coupled between the underhood propulsion system and the
underhood cover and includes a polymeric isolator and a stud
coupled to the polymeric isolator. The stud includes a shank and a
head coupled to the shank. The head is coupled to the polymeric
isolator. The stud assembly includes a boss coupled to the
underhood cover. The boss is disposed adjacent the polymeric
isolator. The shank includes a bending initiator feature in order
to allow the shank to bend when the underhood cover is subjected to
an external force.
Inventors: |
Waskie; David B.;
(Farmington Hills, MI) ; Miller; Jason M.; (St.
Clair Shores, MI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
GM GLOBAL TECHNOLOGY OPERATIONS LLC |
Detroit |
MI |
US |
|
|
Assignee: |
GM GLOBAL TECHNOLOGY OPERATIONS
LLC
Detroit
MI
|
Family ID: |
59410350 |
Appl. No.: |
15/045940 |
Filed: |
February 17, 2016 |
Current U.S.
Class: |
180/291 |
Current CPC
Class: |
F02B 77/00 20130101;
B60K 5/1275 20130101; F16B 35/06 20130101; B60R 21/34 20130101;
F16B 21/075 20130101; B60R 2021/343 20130101 |
International
Class: |
B60K 5/12 20060101
B60K005/12 |
Claims
1. A propulsion assembly, comprising: an underhood propulsion
system; an underhood cover coupled over the underhood propulsion
system; a stud assembly coupled between the underhood propulsion
system and the underhood cover, wherein the stud assembly includes:
a polymeric isolator; a stud coupled to the polymeric isolator,
wherein the stud includes a shank and a head coupled to the shank,
and the head is coupled to the polymeric isolator; a boss coupled
to the underhood cover and disposed adjacent the polymeric isolator
in order to allow energy transfer from the underhood cover to the
polymeric isolator through the boss when the underhood cover is
subjected to an external force; and wherein the shank includes at
least one bending initiator feature in order to allow the shank to
bend when the underhood cover is subjected to the external
force.
2. The propulsion assembly of claim 1, wherein the shank includes a
shank body, the shank body has a diameter, and the at least one
bending initiator feature includes at least one perforation
extending through an entirety of the diameter of the shank
body.
3. The propulsion assembly of claim 2, wherein the underhood cover
includes an inner cover cavity, and the polymeric isolator is
partly disposed in the inner cover cavity.
4. The propulsion assembly of claim 3, wherein the boss is disposed
in the inner cover cavity.
5. The propulsion assembly of claim 4, wherein the boss is shaped
as a knife blade.
6. The propulsion assembly of claim 5, wherein the underhood cover
further includes a first panel and a support wall directly
connected to the first panel, and the boss is directly connected to
the support wall and the first panel.
7. The propulsion assembly of claim 6, wherein the boss is
obliquely angled relative to the support wall.
8. The propulsion assembly of claim 7, wherein the boss defines an
oblique angle relative to the support wall, and the oblique angle
is about 127 degrees.
9. The propulsion assembly of claim 8, wherein the underhood cover
includes at least one snap-fit protrusion extending from the
support wall, and the polymeric isolator includes an isolator body
and defines a snap-fit recess extending into the isolator body, and
the snap-fit recess is sized to receive the snap-fit protrusion in
order to couple the polymeric isolator to the underhood cover.
10. The propulsion assembly of claim 9, wherein the stud includes a
nut integrally coupled to the shank.
11. The propulsion assembly of claim 10, wherein the shank body
includes a threaded portion and a bendable portion, the threaded
portion includes external threads formed on the shank body, the
bendable portion includes the at least one bending initiator
feature, and the nut is disposed between the threaded portion and
the bendable portion.
12. The propulsion assembly of claim 11, wherein the head has a
spherical shape, the polymeric isolator includes an inner isolator
cavity sized to receive the head, and the head is disposed in the
inner isolator cavity in order to couple the stud to the polymeric
isolator.
13. The propulsion assembly of claim 12, wherein the isolator body
has a substantially frustoconical shape in order to facilitate
energy transfer from the boss to the polymeric isolator when the
underhood cover is subjected to the external force.
14. The propulsion assembly of claim 13, wherein the underhood
propulsion system has a top surface, the stud is directly coupled
to the underhood propulsion system, and the stud protrudes away
from the top surface.
15. A stud assembly, comprising: a polymeric isolator including an
isolator body, wherein the polymeric isolator defines an inner
isolator cavity; and a stud coupled to the polymeric isolator,
wherein the stud includes a shank and a head coupled to the shank,
wherein the head is disposed in the inner isolator cavity, and the
shank includes a plurality of bending initiator features in order
to allow the shank to bend when energy is transferred from the
polymeric isolator to the shank.
16. The stud assembly of claim 15, wherein the shank includes a
shank body, the shank body has a diameter, the plurality of bending
initiator features include perforations each extending through an
entirety of the diameter of the shank body.
17. The stud assembly of claim 16, wherein the stud includes a nut
integrally coupled to the shank.
18. The stud assembly of claim 17, wherein the shank body includes
a threaded portion and a bendable portion, the threaded portion
includes external threads formed on the shank body, each of the
perforations extends through the bendable portion, and the nut is
disposed between the threaded portion and the bendable portion.
19. The stud assembly of claim 15, wherein the head has a spherical
shape and is configured to be received in the inner isolator
cavity.
20. The stud assembly of claim 15, wherein the isolator body has a
substantially frustoconical shape.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to a stud assembly configured
to manage and absorb energy originating from an external force
applied to an underhood cover.
BACKGROUND
[0002] Vehicles may sometimes be subjected to external forces. If
an external force is exerted on the vehicle, some vehicles
components may manage and/or absorb the energy of that external
force.
SUMMARY
[0003] The presently disclosed stud assembly can be coupled between
an underhood propulsion system and an underhood cover in order to
absorb energy from an external force applied to the underhood
cover. As non-limiting examples, the underhood propulsion system
may be an internal combustion engine, an electric motor/generator,
or any other suitable system capable of propelling a vehicle. As
non-limiting examples, the underhood cover may be an appearance
cover, an acoustic cover, or a thermal shield. In an embodiment,
the stud assembly is part of a propulsion assembly including an
underhood propulsion system and an underhood cover. The underhood
cover is coupled over the underhood propulsion system. The stud
assembly is coupled between the underhood propulsion system and the
underhood cover and includes a polymeric isolator and a stud
coupled to the polymeric isolator. The stud includes a shank and a
head coupled to the shank. The head is coupled to the polymeric
isolator. The stud assembly further includes a boss coupled to the
underhood cover. The boss is disposed adjacent the polymeric
isolator in order to allow energy transfer from the underhood cover
to the polymeric isolator through the boss when the underhood cover
is subjected to an external force. The shank includes at least one
bending initiator feature in order to allow the shank to bend when
the underhood cover is subjected to the external force.
[0004] The above features and advantages and other features and
advantages of the present teachings are readily apparent from the
following detailed description of the best modes for carrying out
the teachings when taken in connection with the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0005] FIG. 1 is a perspective, fragmentary view of a vehicle
including an underhood propulsion system and an underhood
cover;
[0006] FIG. 2 is a perspective, fragmentary view of the vehicle
shown in FIG. 1 without the underhood cover;
[0007] FIG. 3 is a partially cross-sectional perspective view of a
stud assembly coupled to the underhood cover shown in FIG. 1;
[0008] FIG. 4 is a cross-sectional side view of the stud assembly
shown in FIG. 3;
[0009] FIG. 5 is a partially cross-sectional perspective view of
the stud assembly shown in FIG. 3;
[0010] FIG. 6 is a perspective view of a stud of the stud assembly
shown in FIG. 3, wherein the stud is not subjected to an external
force and is in an original state; and
[0011] FIG. 7 is a perspective view of the stud shown in FIG. 6,
wherein the stud is subjected to an external force and is in a
deformed state.
DETAILED DESCRIPTION
[0012] Referring to the drawings, wherein like reference numbers
correspond to like or similar components throughout the several
figures, and beginning with FIGS. 1 and 2. A vehicle 10 includes a
propulsion assembly 12 for propulsion. The propulsion assembly 12
includes an underhood propulsion system 14 and an underhood cover
16 disposed over the underhood propulsion system 14. As
non-limiting examples, the underhood propulsion system 14 may be an
internal combustion engine, an electric motor/generator, or any
other suitable system capable of propelling a vehicle. As
non-limiting examples, the underhood cover 16 may be an appearance
cover, an acoustic cover, or a thermal shield. In particular, the
underhood propulsion system 14 has a top surface 18 (FIG. 2), and
the underhood cover 16 is coupled to the underhood propulsion
system 14. As such, the underhood cover 16 covers at least part of
the top surface 18 in order to protect the underhood propulsion
system 14.
[0013] With reference to FIGS. 2-5, the propulsion assembly 12
further includes at least one stud assembly 100 for managing energy
transfer when the underhood cover 16 is subjected to an external
force F. When the underhood cover 16 is subjected to the external
force F, it is desirable to manage and/or absorb the energy from
the external force F. To this end, the presently disclosed stud
assembly 100 is coupled between the underhood cover 16 and the
underhood propulsion system 14 in order to manage and/or absorb
energy when the underhood cover 16 is subjected to the external
force F. It is contemplated that the propulsion assembly 12 may
include a plurality of stud assemblies 100. For example, in the
depicted embodiment, four stud assemblies 100 are coupled between
the underhood cover 16 and the underhood propulsion system 14.
Regardless of the quantity, each stud assembly 100 includes a
polymeric isolator 102 and a stud 104 coupled to the polymeric
isolator 102. Each stud 104 is directly coupled to the underhood
propulsion system 14 and protrudes from the top surface 18 toward
the underhood cover 16, as shown in FIG. 2. Thus, each stud 104
protrudes away from the top surface 18.
[0014] The underhood cover 16 includes a first panel 20, such as a
top panel, and a second panel 22, such as a side panel, coupled to
the first panel 20. It is contemplated, however, that the underhood
cover 16 does not necessarily include the second panel 22. The
underhood cover 16 defines an inner cover cavity 26. The polymeric
isolator 102 serves as a vibration and thermal insulator and is at
least partially disposed in the inner cover cavity 26 to facilitate
energy transfer between the underhood cover 16 and the stud
assembly 100. Specifically, the majority of the polymeric isolator
102 is disposed in the inner cover cavity 26 to facilitate energy
transfer between the underhood cover 16 and the stud assembly 100.
In addition to the polymeric isolator 102, the stud assembly 100
includes a boss 106 at least partially disposed in the inner cover
cavity 26. The boss 106 is coupled to the underhood cover 16 and is
disposed adjacent the polymeric isolator 102 in order to allow
energy transfer from the underhood cover 16 to the polymeric
isolator 102 when the underhood cover 16 is subjected to the
external force F. Specifically, when the underhood cover 16 is
subjected to the external force F, the underhood cover 16 deforms,
causing the boss 106 to move toward (and contact) the polymeric
isolator 102. As a consequence, the boss 106 pushes the polymeric
isolator 102 and, in turn, the stud 104 deforms, thereby absorbing
energy from the external force F. It is contemplated that the
deformation of the stud 104, when the underhood cover 16 receives
the external force F, may lead to fracture. This fracture also
facilitates the energy transfer and/or absorption by the stud
assembly 100 when the underhood cover 16 is subjected to the
external force F. To facilitate the deformation and/or fracture,
the stud 104 may have one or more bending initiator features 107,
such as perforations 108, as discussed in detail below.
[0015] The polymeric isolator 102 isolates the underhood cover 16
from the underhood propulsion system 14 (FIG. 2) when the underhood
cover 16 is subjected to the external force F. To this end, the
polymeric isolator 102 is wholly or partly made of a suitable
polymeric material, such as natural or synthetic rubber, in order
to effectively manage and/or absorb energy from the external force
F and isolate the underhood cover 16 from underhood propulsion
system 14. In addition, the polymeric isolator 102 facilitates
energy transfer from the boss 106 to the stud 104 when the
underhood cover 16 receives the external force F. To this end, the
polymeric isolator 102 has an isolator body 103 having a
substantially frustoconical shape. The polymeric isolator 102 is
substantially hollow and therefore defines an inner isolator cavity
110 extending into the isolator body 103. The inner isolator cavity
110 is configured, shaped, and sized to receive a portion of the
stud 104 in order to couple the stud 104 to the polymeric isolator
102. The inner isolator cavity 110 includes a first or insertion
cavity portion 112 and a second or coupling cavity portion 114. The
first cavity portion 112 is larger than the second cavity portion
114 in order to facilitate insertion of the stud 104 into the inner
isolator cavity 110. The second cavity portion 114 is smaller than
the first cavity portion 112 such that the stud 104 can be coupled
to the polymeric isolator 102 after it has been inserted through
the first cavity portion 112.
[0016] The polymeric isolator 102 can be coupled to the underhood
cover 16 through a snap-fit arrangement or any other suitable
coupling arrangement. As a non-limiting example, the underhood
cover 16 includes at least one snap-fit protrusion 24 configured to
be securely received in snap-fit recess 116 of the polymeric
isolator 102. In particular, each of the snap-fit protrusions 24
and the snap-fit recesses 116 may have an annular shape in order to
facilitate the connection between the polymeric isolator 102 and
the underhood cover 16. The snap-fit protrusion 24 may extend from
a support wall 28 of the underhood cover 16. In the depicted
embodiment, the support wall 28 directly interconnects the first
panel 20 and the second panel 22 in order to enhance the structural
stability of the underhood cover 16.
[0017] As discussed above, the boss 106 is disposed in the inner
cover cavity 26 and may be directly coupled to the support wall 28
in order to enhance the structural stability of the underhood cover
16. The boss 106 may also be directly coupled to the first panel 20
of the underhood cover 16. As a non-limiting example, the boss 106
may be molded with the underhood cover 16 and may be wholly or
partly made of a polymeric material that is sufficiently stiff to
bend the stud 104 when the underhood cover 16 is subjected to the
external force F. Further, the boss 106 has an elongated shape and
is obliquely angled relative to the support wall 28 of the
underhood cover 16 to maximize energy transfer between the
underhood cover 16 and the stud 104. As a non-limiting example, the
oblique angle .theta. defined between the boss 106 and the support
wall 28 is about one-hundred twenty seven (127) degrees such that
the boss 106 is perpendicular to the external force F, thereby
maximizing energy transfer between the underhood cover 16 and the
stud 104 when the underhood cover 16 is subjected to the external
force F.
[0018] Aside from being elongated, the boss 106 is shaped as a
knife blade in order to transfer sufficient energy from the
underhood cover 16 to the polymeric isolator 102 in order to bend
the stud 104 when the underhood cover 16 receives the external
force F. Specifically, the boss 106 includes a first boss portion
118 and a second boss portion 120 coupled to the underhood cover 16
only through the first boss portion 118. The second boss portion
120 is therefore farther from the first panel 20 than the first
boss portion 118. In order to focus and maximize the energy
transfer from the underhood cover 16 to the polymeric isolator 102,
the width W1 of the first boss portion 118 is less than the width
W2 of the second boss portion 120.
[0019] With reference to FIGS. 6 and 7, the stud 104 is wholly or
partly made of a metallic material and can deform (e.g., bend) when
energy is transferred from the boss 106 to the stud 104 through the
polymeric isolator 102. The stud 104 includes a shank 122 and a
head 124. In the depicted embodiment, the head 124 has a
substantially spherical shape to facilitate insertion to, and
coupling to, the polymeric isolator 102. Thus, the head 124 may be
referred to as a ball. The second cavity portion 114 (FIG. 4) of
the polymeric isolator 102 is configured, shaped, and sized to
receive the head 124 in order to couple the stud 104 to the
polymeric isolator 102.
[0020] The shank 122 includes a shank body 126 having a first shank
end 128 and a second shank end 130 opposite the first shank end
128. The head 124 is directly coupled to the first shank end 128 of
the shank body 126. The shank body 126 includes a threaded portion
132 and a bendable portion 134 coupled to the threaded portion 132.
The threaded portion 132 includes external threads 136 formed on
the shank body 126 in order to couple the stud 104 to the underhood
propulsion system 14 (FIG. 2). To facilitate the connection between
the underhood propulsion system 14 (FIG. 2) and the stud 104, the
threaded portion 132 is closer to the second shank end 130 than to
the first shank end 128 of the shank body 126.
[0021] The stud 104 further includes a nut 138 disposed between the
threaded portion 132 and the bendable portion 134 of the shank body
126. In the depicted embodiment, the nut 138 is integrally coupled
to the shank 122 so as to form a one-piece structure, thereby
minimizing costs. A tool (e.g., driver) can engage the nut 138 to
thread (or otherwise connect) the stud 104 to the underhood
propulsion system 14. For this reason, the nut 138 is closer to the
second shank end 130 than to the first shank end 128 of the shank
body 126. As shown in FIGS. 5 and 6, the nut 138 may be disposed in
different orientations relative to the head 124.
[0022] The stud 104 includes at least one bending initiator feature
107 to facilitate deformation and fracture of the stud 104 when the
underhood cover 16 is subjected to the external force F (FIG. 3).
As non-limiting examples, the bending initiator feature 107 may be
holes, stress risers, recesses, the notches, or any other
structural feature capable of facilitating deformation and/or
fracture of the stud 104 when the underhood cover 16 is subjected
to the external force F (FIG. 3). In the depicted embodiment, for
example, the stud 104 includes at least one perforation 108
extending through the bendable portion 134 of the shank body 126 to
facilitate deformation and fracture of the stud 104 when the
underhood cover 16 is subjected to the external force F (FIG. 3).
In the depicted embodiment, the stud 104 includes a plurality of
perforations 108. Each perforation 108 extends through the entire
diameter D of the shank body 126 to facilitate deformation and
fracture. Further, in the depicted embodiment, each of the
perforations 108 has a different orientation with respect to one
another in order to facilitate deformation of the stud 104
regardless of the specific orientation of the external force F
relative to the underhood cover 16. When the underhood cover 16
receives the external force F, the perforations 108 serve as
bending or fracture initiators. The size and number of perforations
108 can be tuned to the specific application.
[0023] With reference again to FIGS. 1-7, when the external force F
is applied to hood of the vehicle 10, the hood of the vehicle 10
deflects and causes the underhood cover 16 to deflect as well. The
deflection of the underhood cover 16 causes the boss 106 to move
toward the polymeric isolator 102. Then, the boss 106 eventually
contacts the top of the polymeric isolator 102 and pushes the
polymeric isolator 102. As a consequence, the polymeric isolator
102 exerts pressure on the stud 104, causing the bendable portion
134 of the stud 104 to bend and possibly fracture at a location
near the perforations 108. The deformation and fracture of the stud
104 allows the stud assembly 100 to absorb at least some of the
energy from the external force F.
[0024] While the best modes for carrying out the teachings have
been described in detail, those familiar with the art to which this
disclosure relates will recognize various alternative designs and
embodiments for practicing the teachings within the scope of the
appended claims.
* * * * *