U.S. patent application number 16/718806 was filed with the patent office on 2021-06-24 for displacement resistance device for a vehicle crush-can assembly and crush-can yield adjustment method.
The applicant listed for this patent is Ford Global Technologies, LLC. Invention is credited to Saeed David Barbat, S.M. Iskander Farooq, Mohammad Omar Faruque, Dean M. Jaradi.
Application Number | 20210188204 16/718806 |
Document ID | / |
Family ID | 1000004589981 |
Filed Date | 2021-06-24 |
United States Patent
Application |
20210188204 |
Kind Code |
A1 |
Faruque; Mohammad Omar ; et
al. |
June 24, 2021 |
DISPLACEMENT RESISTANCE DEVICE FOR A VEHICLE CRUSH-CAN ASSEMBLY AND
CRUSH-CAN YIELD ADJUSTMENT METHOD
Abstract
A vehicle system includes, among other things, a crush-can
assembly that is disposed between a bumper member and a vehicle
frame. The crush-can assembly is configured to yield when the
bumper member is moved closer to the vehicle frame. The system
further includes a displacement resistance device that has a
chamber that holds a liquid-nano material. The liquid-nano material
is compressed within the chamber to resist a movement of the bumper
member toward the vehicle frame.
Inventors: |
Faruque; Mohammad Omar; (Ann
Arbor, MI) ; Farooq; S.M. Iskander; (Novi, MI)
; Jaradi; Dean M.; (Macomb, MI) ; Barbat; Saeed
David; (Novi, MI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Ford Global Technologies, LLC |
Dearborn |
MI |
US |
|
|
Family ID: |
1000004589981 |
Appl. No.: |
16/718806 |
Filed: |
December 18, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B60R 19/34 20130101;
B60R 19/32 20130101 |
International
Class: |
B60R 19/32 20060101
B60R019/32; B60R 19/34 20060101 B60R019/34 |
Claims
1. A vehicle system, comprising: a crush-can assembly disposed
between a bumper member and a vehicle frame, the crush-can assembly
configured to yield when the bumper member is moved closer to the
vehicle frame; and a displacement resistance device including a
chamber that holds a liquid-nano material, the liquid-nano material
compressed within the chamber to resist a movement of the bumper
member toward the vehicle frame.
2. The vehicle system of claim 1, wherein the crush-can assembly
has an interior, the chamber disposed entirely outside the
interior.
3. The vehicle system of claim 1, wherein no portion of the chamber
is disposed between the bumper member and the vehicle frame.
4. The vehicle system of claim 1, wherein the displacement
resistance device includes a rack and a pinion, the rack configured
to urge the pinion to rotate when the bumper member is urged toward
the vehicle frame by a force applied to the bumper member, wherein
the liquid in the chamber resists a rotation of the pinion to
increase the force required to move the bumper member toward the
vehicle frame.
5. The vehicle system of claim 4, further comprising a bracket
secured to the crush-can assembly, the chamber held by the
bracket.
6. The vehicle system of claim 5, wherein the pinion has a first
end held by the bracket and a second end extending into the
chamber.
7. The vehicle system of claim 6, wherein the second end of the
pinion threadably engages the chamber.
8. The vehicle system of claim 4, wherein the rack includes a
portion that extends into an interior of the crush-can, wherein the
pinion and the chamber are disposed entirely outside the interior
of the crush-can.
9. The vehicle system of claim 8, wherein the chamber and the
pinion are aft the crush-can assembly relative to a general
orientation of a vehicle having the crush-can assembly.
10. The vehicle system of claim 1, wherein the liquid-nano material
comprises a plurality of nanoporous particles suspended within a
chemically inert liquid.
11. The vehicle system of claim 10, wherein the plurality of
nanoporous particles are silicon and the chemically inert liquid is
oil or water.
12. A crush-can yield adjustment method, comprising: holding a
liquid-nano material within a chamber that is separate from a
crush-can assembly, the crush-can assembly disposed between a
bumper member and a vehicle frame, the crush-can assembly
configured to yield when the bumper member is moved closer to the
vehicle frame; and resisting movement of the bumper member toward
the vehicle frame using the liquid-nano material.
13. The crush-can yield adjustment method of claim 12, wherein the
crush-can assembly has an interior, the chamber disposed entirely
outside the interior.
14. The crush-can yield adjustment method of claim 12, further
comprising: applying a force to the bumper member; using a rack to
resist movement of the bumper member toward the vehicle frame in
response to the force; using a pinion to resist movement of the
rack; and using the liquid-nano material to resist rotation of the
pinion.
15. The crush-can yield adjustment method of claim 14, wherein the
rack extends into an interior of the crush-can assembly, wherein
the chamber and the pinion are aft the crush-can assembly relative
to a general orientation of a vehicle having the crush-can
assembly.
16. The crush-can yield adjustment method of claim 12, wherein the
liquid-nano material comprises a plurality of nanoporous particles
suspended within a chemically inert liquid.
17. The crush-can yield adjustment method of claim 16, wherein the
plurality of nano-porous particles are silicon and the chemically
inert liquid is oil or water.
Description
TECHNICAL FIELD
[0001] This disclosure relates generally to a crush-can assembly
for a vehicle and, more particularly, to a displacement resistance
device used in connection with the crush-can assembly.
BACKGROUND
[0002] Motor vehicles are known to include front and rear bumpers,
which are structures that are attached to or integrated with the
front and rear ends of the vehicle, respectively, and configured to
absorb loads. Crush-can assemblies can couple the bumpers to the
vehicle frame. The crush-can assemblies can absorb some of the
loads applied to the bumper.
SUMMARY
[0003] A vehicle system according to an exemplary aspect of the
present disclosure includes, among other things, a crush-can
assembly that is disposed between a bumper member and a vehicle
frame. The crush-can assembly is configured to yield when the
bumper member is moved closer to the vehicle frame. The system
further includes a displacement resistance device that has a
chamber that holds a liquid-nano material. The liquid-nano material
is compressed within the chamber to resist a movement of the bumper
member toward the vehicle frame.
[0004] In another example of the foregoing system, the crush-can
assembly has an interior. The chamber is disposed entirely outside
the interior.
[0005] In another example of any of the foregoing systems, no
portion of the chamber is disposed between the bumper member and
the vehicle frame.
[0006] In another example of any of the foregoing systems, the
displacement resistance device includes a rack and pinion. The rack
is configured to urge the pinion to rotate when the bumper member
is urged toward the vehicle frame by a force applied to the bumper
member. The liquid in the chamber resists a rotation of the pinion
to increase the force required to move the bumper member toward the
vehicle frame.
[0007] Another example of any of the foregoing systems includes a
bracket that is secured to the crush-can assembly. The chamber is
held by the bracket.
[0008] In another example of any of the foregoing systems, the
pinion has a first end held by the bracket and a second end that
extends into the chamber.
[0009] In another example of any of the foregoing systems, the
second end of the pinion threadably engages the chamber.
[0010] In another example of any of the foregoing systems, the rack
includes a portion that extends into an interior of the crush-can.
The pinion and the chamber are disposed entirely outside the
interior of the crush-can.
[0011] In another example of any of the foregoing systems, the
chamber and the pinion are aft the crush-can assembly relative to a
general orientation of a vehicle that has the crush-can
assembly.
[0012] In another example of any of the foregoing systems, the
liquid-nano material includes a plurality of nanoporous particles
that are suspended within a chemically inert liquid.
[0013] In another example of any of the foregoing systems, the
plurality of nanoporous particles are silicon and the chemically
inert liquid is oil or water.
[0014] A crush-can yield adjustment method according to another
exemplary aspect of the present disclosure includes, among other
things, holding a liquid-nano material within a chamber that is
separate from a crush-can assembly. The crush-can assembly is
disposed between a bumper member and a vehicle frame. The crush-can
assembly is configured to yield when the bumper member is moved
closer to the vehicle frame. The method further includes resisting
movement of the bumper member toward the vehicle frame using the
liquid-nano material.
[0015] In another example of the foregoing method, the crush-can
assembly has an interior. The chamber is disposed entirely outside
the interior.
[0016] In another example of any of the foregoing methods, the
method further includes applying a force to the bumper member. The
method further includes using a rack to resist movement of the
bumper member toward the vehicle frame in response to the force,
using a pinion to resist movement of the rack, and using the
liquid-nano material to resist rotation of the pinion.
[0017] In another example of any of the foregoing methods, the rack
extends into an interior of the crush-can assembly. The chamber and
the pinion are aft the crush-can assembly relative to a general
orientation of a vehicle that has the crush-can assembly.
[0018] In another example of any of the foregoing methods, the
liquid-nano material includes a plurality of nanoporous particles
suspended within a chemically inert liquid.
[0019] In another example of any of the foregoing methods, the
plurality of nano-porous particles are silicon and the chemically
inert liquid is oil or water.
[0020] The embodiments, examples and alternatives of the preceding
paragraphs, the claims, or the following description and drawings,
including any of their various aspects or respective individual
features, may be taken independently or in any combination.
Features described in connection with one embodiment are applicable
to all embodiments, unless such features are incompatible.
BRIEF DESCRIPTION OF THE FIGURES
[0021] The various features and advantages of the disclosed
examples will become apparent to those skilled in the art from the
detailed description. The figures that accompany the detailed
description can be briefly described as follows:
[0022] FIG. 1 illustrates a perspective view of a vehicle having a
front bumper and a rear bumper.
[0023] FIG. 2 illustrates an expanded view of the front bumper and
a bumper support system of the vehicle of FIG. 1.
[0024] FIG. 3 illustrates a rear view of the bumper support system
of FIG. 2.
[0025] FIG. 4 illustrates a close up view of an area of the bumper
support system of FIG. 3 with a partially section view of a
crush-can assembly of the bumper support system.
[0026] FIG. 5 illustrates a displacement resistance device utilized
with the crush-can assembly of FIG. 4.
[0027] FIG. 6 illustrates an expanded view of selected portions of
the displacement resistance device of FIG. 5.
[0028] FIG. 7 illustrates a section view of a chamber of the
displacement resistance device.
[0029] FIG. 8 graphically illustrates a plot of force versus crush
distance for a first crush-can that is not utilizing a displacement
resistance device, a second crush-can that is utilizing a
displacement resistance device that provides a first resistance,
and a third crush-can that is utilizing a displacement resistance
device that provides a second resistance.
DETAILED DESCRIPTION
[0030] This disclosure relates generally to vehicle crush-can
assemblies that utilize displacement resistance devices having
liquid-nano material. The displacement resistance devices increase
an amount of force that must be applied to a bumper in order to
cause the crush-can assemblies to yield.
[0031] FIG. 1 illustrates a motor vehicle 10, which, in this
example, is a pickup truck. The vehicle 10 includes a front bumper
12 and a rear bumper 14.
[0032] FIG. 2 illustrates an expanded view of the front bumper 12
and a bumper support system 16 that supports the front bumper 12.
The bumper support system 16 includes a bumper beam 18, and
crush-can assemblies 20 disposed between the bumper beam 18 and
portions of a vehicle frame 24. Crush-can assemblies could be used
elsewhere on the vehicle 10, such as in connection with the rear
bumper 14.
[0033] When installed within the vehicle 10, the front bumper 12 is
mounted to the bumper beam 18. The crush-can assemblies 20, one on
a passenger side and one on a driver side of the vehicle 10, secure
the bumper beam 18 to portions of the vehicle frame 24. When a
force F, such as an impact load, is applied to the front bumper 12,
the crush-can assemblies 20 manage energy distribution associated
with the force.
[0034] Referring now to FIGS. 3-6, if the force F exceeds a
threshold force level, one or both of the crush-can assemblies 20
can yield permitting movement of the bumper beam 18 closer to the
vehicle frame 24. As the crush-can assemblies 20 yield, a distance
X between the bumper beam 18 and the vehicle frame 24
decreases.
[0035] The crush-can assemblies 20, the exemplary embodiment, are
frustoconcial. The crush-can assemblies 20 can be formed from
metal, for example.
[0036] The threshold force level that is required to cause the
crush-can assemblies 20 to yield can vary based on a design of the
crush-can assemblies 20. For example, a thickness of the metal
could be increased if a higher threshold force level is desired.
The threshold force level that is required to cause the crush-can
assemblies 20 to yield can also vary based on, among other things,
a weight of the vehicle 10 and an architecture of the vehicle
10.
[0037] While the crush-can assemblies 20 can be designed for
specific vehicle architectures, this increases part complexity as a
specific type of crush-can assembly may be required for each
vehicle architecture. As can be appreciated, utilizing a common
crush-can assembly design across multiple vehicle platforms can
help to reduce part complexity.
[0038] Accordingly, the crush-can assemblies 20 of the exemplary
embodiment are each utilized in connection with a displacement
resistance device 28. The displacement resistance device 28 can
resist movement of the bumper beam 18 toward the vehicle frame 24
in response to the force F, which increases the threshold force
level that must be reached before the associated crush-can assembly
20 yields. Resisting movement of the bumper beam 18 toward the
vehicle frame 24 with the displacement resistance device 28
increases the threshold force level that must be reached to cause
the crush-can assembly 20 to yield. The increased threshold force
level is needed in order to overcome the resistance provided by the
displacement resistance device 28. The resistance provided by the
displacement resistance device 28 is relatively easy to adjust.
[0039] The displacement resistance device 28, in the example
embodiment, has a rack and pinion system that is used to resist
displacement. The rack and pinion system includes a rack 36, a
pinion 40, and a chamber 44 that holds a liquid-nano material 50
(FIG. 7).
[0040] The rack 36 extends from the pinion 40 to a rear of the
bumper beam 18. When the force F is applied, the force F urges the
rack 36 in the direction D. Teeth of the rack 36 are engaged with
teeth of the pinion 40. Thus, movement of the rack 36 in the
direction D is resisted by the pinion 40.
[0041] In order for the rack 36 to move in the direction R, the
rack 36 needs to rotate the pinion 40 in the direction R. Rotation
of the pinion 40 in the direction R requires, in the exemplary
embodiment, the chamber 44 to translate relative to the pinion 40
along a rotational axis of the pinion 40 such that the pinion 40
extends further into the chamber 44. Relative movement of the
pinion 40 into the chamber 44 reduces a volume of the chamber 44
thereby requiring compression of the liquid-nano material 50 held
within the chamber 44.
[0042] The threshold force level required to move the rack 36 in
the direction R is thus directly related to the compression
resistance provided by the liquid-nano material 50 within the
chamber 44. In the exemplary embodiment, the bumper beam 18 does
not move closer to the vehicle frame 24 to cause the crush-can
assembly 20 to yield until the rack 36 is moved in the direction R.
The threshold force level required to cause the crush-can assembly
20 to yield is thus also directly related to the compression
resistance provided by the liquid-nano material 50 within the
chamber 44. If the liquid-nano material 50 prevents rotation of the
pinion 40 relative to the chamber 44, linear movement of the rack
36 in the direction D is prevented.
[0043] The liquid-nano material 50, in the exemplary embodiment,
includes a plurality of nanoporous particles 54 suspended within a
liquid 58. The nanoporous particles 54 can be silicon, and the
liquid 58 can be a chemically inert liquid, such as oil or water.
Exemplary nanoporous particles can remain hydrophobic at certain
pressures, and then take in liquid in response to an increased
pressure. Thus, within the chamber 44, the liquid-nano material 50
can limit rotation of the pinion 40 relative to the chamber 44
until the pressure on the liquid-nano material 50 exceeds a
threshold pressure. After which, the nanoporous particles 54 take
in liquid to effectively reduce a volume of the liquid-nano
material 50 within the chamber 44. The reduced volume permits
rotation of the pinion 40 relative to the chamber 44 such that the
pinion 40 can extend further into the chamber 44. In some examples,
the threshold pressure can be designed to vary from 0.5 MPa to 50
MPa while volume change can be as high as 80 percent.
[0044] The compression resistance provided by the liquid-nano
material 50 within the chamber 44 can be altered by adjusting a
mixture of the nanoporous particles 54 and the liquid 58. By
adjusting the compression resistance of the liquid-nano material
50, the threshold force level required to cause the crush-can
assembly 20 to yield and move the bumper beam 18 closer to the
vehicle frame 24 can be adjusted.
[0045] The displacement resistance device 28 can thus be adjusted
to provide a desired resistance to crush-can yield without
requiring substantial modifications to the crush-can assembly 20.
The displacement resistance device 28 can be adjusted to facilitate
the use of a common crush-can assembly among a variety of different
vehicle architectures and different vehicle weights.
[0046] The adjusting of the displacement resistance device 28 can
occur by increasing or decreasing the compression resistance
provided by the displacement resistance device 28, for example, by
changing the composition of the liquid-nano material 50 held within
the chamber 44, by changing an amount of the liquid-nano material
50 held within the chamber 44, or both.
[0047] The exemplary crush-can assembly 20 includes an interior 62.
The rack 36 extends through the interior 62 forward relative to an
orientation of the vehicle 10 (FIG. 1) to a position where the rack
36 is attached to the bumper beam 18. The rack 36 extends
longitudinally aft relative to the orientation of the vehicle 10 to
a position where teeth of the rack 36 engage with teeth of the
pinion 40.
[0048] The pinion 40 extends from a first end portion 66 to a
second end portion 70. The first end portion 66 is secured within a
bracket 74 between two threaded nuts 78. The spacing between the
nuts 78 is sufficient to permit rotation of the pinion 40.
[0049] In the exemplary embodiment, the bracket 74 has a U-shaped
configuration with a first leg 82 and a second leg 86. The first
leg 82 provides an aperture 90 that receives the first end 66 of
the pinion 40. The nuts 78 are disposed on opposite side of the
first leg 82. The nuts 78 permit rotation of the pinion 40, but
substantially prevent the pinion 40 from translating relative to
the bracket 74 along a rotational axis of the pinion 40. The second
leg 86 includes an aperture 94 that receives and holds the chamber
44 such that the chamber 44 is blocked from rotating when the
pinion 40 rotates. The bracket 74 can, in some examples, include
guides 96 to ensure movement of the rack 36 is along the direction
D.
[0050] The second end portion 70 of the pinion 40 threadably
engages with an aperture 98 of the chamber 44. Rotating the pinion
40 in the direction R translates the chamber 44 axially relative to
the pinion 40 such that the end portion 70 of the pinion 40 is
inserted further into an interior of the chamber 44.
[0051] While a rack and pinion system is shown, other embodiments
of the displacement resistance device 28 could compress a
liquid-nano material in other ways to provide a desired amount of
resistance.
[0052] With reference now to FIG. 8, a line 100 represents a force
versus yield distance for a crush-can assembly that does not
include a displacement resistance device. A line 110 represents the
crush-can assembly represented by the line 100, but with the
addition of a displacement resistance device providing a first
amount of resistance. Line 120 represents the crush-can assembly in
line 100 utilized with a second type of displacement resistance
device that provides a second amount of resistance that is greater
than the first amount of resistance. The second type of
displacement resistance device could differ from the first type of
displacement device only because a different composition or type of
liquid-nano material is utilized.
[0053] The preceding description is exemplary rather than limiting
in nature. Variations and modifications to the disclosed examples
may become apparent to those skilled in the art that do not
necessarily depart from the essence of this disclosure. Thus, the
scope of legal protection given to this disclosure can only be
determined by studying the following claims.
* * * * *