BACK DOOR ASSEMBLY FOR DAMPING VIBRATIONS
FIELD OF INVENTION:
[001] The present subject matter described herein, relates to damping of
vibrations in a vehicle and, in particular, to back door assembly of the vehicle in
5 which an anti-vibration sheet is disposed between back door panel and back door
glass for damping vibrations in the vehicle.
DACKGROUND AND PRIOR ART:
[002] Generally in vehicles an opening portion is formed ·at a back wall of the
vehicle body, and a back door is provided to open or close the opening portion.
10 The back door is connected with the vehicle body by a latch mechanism. During
the movement of the vehicle, vibrations and sound, such compression and .
rarefaction are created due to harshness of road surface, shocker conditions, and
speed of the vehicle. These vibrations and sound make passeqger of the vehicle
frustrated and uneasy.
15 [003) In order to absorb the vibrations and sound, anti-vibration sheets are
provided in the back door during manufacturing of the back door. Fig. 1 shows
structure of the back door of the vehicle, such as hatch back vehicle. Fig. 2 shows
the cross sectional view of the back door panel 1. Further, the back door 1
comprises an inner panel 2 and an outer panel 3. The inner panel2 and the outer
20 panel 3 of the back door 1 form a box section. The box section area is between the
inner panel 2 and the outer panel 3 of the back door 1. Dufing the back door
harness assembly process, back door harness 5 (shown in figure 3) passes through
the box section area of the back door 1.
[004] Fig. 3 shows the assembly of the back door with anti vibration sheet. In the
25 conventional back door structure, anti vibration ·sheet 6 is provided on the back
door outer panel 3 ofth~ back door 1 from the inside. The anti-vibration sheet 6 is
provided in the box section area of the back door I. The anti-vihration sheet 6 has
high thickness of at! east 4.0 mm.
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Therefore, the anti-vibration sheet 6 reduces effective opening area inside the box
section area of the back door 1. During assembly of the back door harness 5, the
back door harness 5 interferes with the anti-vibration sheet 6 which is pasted on
inner surface of the back door outer panel 3. Further, the anti-vibration sheet 6
5 increases difficuity in fitment of the back door harness 5 in the back door 1.
Furthermore, the anti-vibration sheet 6 peels off due to restricted forc.e applied
from the back door harness 5 during assembly.
[005] Conventionally, the anti-vibration sheet 6 is pasted on inner surface of the
back door outer panel 3. The weight of the anti-vibration sheet 6 acts vertically in
10 down direction. During the movement of the vehicle extra forces acts on the antivibration
sheet 6 which further increases the weight of the anti-vibration sheet 6.
The self weight with gravity and acted forces lead to peeling off the anti-vibration
sheet 6 from the inner surface of the back door outer panel 3. The anti-vibration
sheet 6 is only pasted on the inner surface of the back door panel 3. Further, the
15 anti-vibration sheet 6 does not have any support from the back to prevent the
peeling off of the anti-vibration sheet 6 due to vertical downward force.
[006] Accordingly, there is need for a simple low cost structure that provides
damping of vibrations in the back door of the vehicle without addition of any
extra material which increases the weight of the vehicle. Further, the structure
20 should provide enough space for movement of back door harness during assembly
and proper support for the anti-vibration sheet to prevent the peeling off of the
same.
OBJECTS OF THE INVENTION:
[007] The principal objective of the present invention. is to provide an anti-
25 vibration sheet between the back door glass and back door for damping vibrations
in the vehicle.
[008] Another object of the present invention is to provide a back door panel
with sufficient space for un-obstructed movement of back door harne.ss during
assembly.
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[009] Another object of the present invention is to prevent peeling off the antivibration
sheet from the back door panel.
[0010] Yet another object of the present invention is to increase the life time of
the anti-vibration sheet.
5 [0011) Yet another object of the present invention is to increase the serviceability
of the back door panel.
SU:MMARYOF TI-lE INVENTION:
[0012] The present invention relates to back door assembly of vehicle for
damping vibrations. The back door assembly comprises an anti-vibration sheet
10 which is disposed between the back door glass and back door outer panel· from
outer side of the back door outer panel for damping vibrations in vehicle at back
side. The present back door assembly provides an opening area for movement of
back door harness during assembly. Further, the present back door assembly
prevent peeling of the anti vibration sheet from the back door outer panel.
15 [0013] In order to further understand the characteristics and technical contents of
the present subject matter, a description relating thereto will be made with
reference to the accompanying drawings. However, the drawings are illustrative
only but not used to lim.it scope of the present subject matter.
BRIEF DESCRIPTION OF THE DRAWINGS
20 [0014] It is to be noted, however, that the appended drawings illustrate only
typical embodiments of the present subject matter and are therefore not to be
considered for limiting of its scope, for the invention may admit to other equally
effective embodiments. The detailed description is described with reference to the
accompanying figures. In the figures, the left-most digit(s) of a reference number
25 identifies the figure in which the reference number first appears. The same
numbers are used throughout the figures to reference like features and
components. Some embodiments of system or methods in accordance with
embodiments of the present subject matter are now described, by way of example,
and with reference to the accompanying figures, in which:
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[0015] Fig. 1 shows back_door of vehicle;
[0016) Fig. 2 illustrates cross sectional view of the back door panel of the vehicle;
[0017] Fig. 3 illustrates a anti-vibration sheet on inner surface of the back door
outer pand ofthe vehicle as known in the art;
5 [0018] Fig. 4 illustrates anti-vibration sheet weighing m vertical downward
direction as known in the art;
[0019] Fig. 5 illustrates anti-vibration sheet between back door glass and the back -
door outer panel of the vehicle, in accordance with an embodiment of the present
subject matter; and
10 [0020] Fig. 6 illustrates weight distribution of the anti-vibration sheet between
_ back door glass and the back door outer panel of the vehicle, in accordance with
an embodiment ofthe present subject matter.
[0021] The figures depict embodiments of the present subject matter for the
purposes of illustration only. A person skilled in the art will easily recognize from
15 the following description that alternative embodiments of the structures and
methods illustrated herein may be employed without departing from the principles
ofthe disclosure described herein.
DESCRIPTION OF THE PREFERRED'EMBODIMENTS:
[0022] The subject matter disclosed herein relates to back door assembly of the
20 vehicle for damping vibrations: The back door assembly comprises a back door, a
back door glass and an anti-vibration sheet. Further the anti-vibration sheet is
disposed between the back door glass and the back door outer panel from outer
side for damping vibrations in vehicle. The present back door assembly provides
sufficient opening area for un-obstructed movement of back door harness during
25 assembly. Further, the present back door assembly prevent peeling o(f the antivibration
sheet from the back door outer panel.
[0023] As explained above, the anti-vibration sheet is pasted on inner surface of
the back door outer panel of the back door. Further, the complete anti-vibration
5
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sheet is pasted in the box section area of the door panel from inner side and,
therefor~, reduces opening area for movement 'of back door harness in the box
section area of the back door panel. During assembly of the back door harness, the
anti-vibration sheet creates obstruction for movement of the back door harness.
5 Further, the anti-vibration sheet is pasted on the inner surface of the back door
outer panel without any support from the box section area. The anti-vibration
sheet hangs in the box section area of the back door and does not have any support
from box section area. The weight of the anti-vibration sheet acts in vertically
downward direction which leads to peeing off the anti-vibration sheet. The
10 conventional technologies do not provide any method and structure to support the
anti-vibration sheet in the back door panel.
[0024] According to an implementation of the present -subject matter, an antivibration
sheet is disposed between back door glass and back door panel of the
vehicle for damping vibrations. The present back door assembly comprises a back
15 door panel, back door glass, and an anti-vibration sheet which is disposed between
the back door glass and back door panel of the vehicle. The anti-vibration sheet is
provided on the back door outer panel from outer side.
[0025] In one embodiment of the present subject matter, the anti-vibration sheet is
pasted on outer surface of the back door outer panel from outer side. Therefore, in
20 the box section area, there is no anti-vibration sheet for obstructing the movement
of the back door harness. Further, there is no requirement to provide a separate
support for the anti-vibration sheet in the box section area to prevent peeling off
the same. Further, it also reduces the weight of the back door panel. The present
structure of the back door assembly provides easy serviceability of the back door.
25 [0026] In another embodiment of the present subject matter, the anti-vibration
sheet is pasted on the outer surface of the back door outer panel from the outer
side. Therefore, the anti-vibration sheet has proper support from the outer surface
of the back door outer panel. Further, weight of the anti-vibration sheet is
completely distributed on the outer surface of the back door outer panel. The
· 30 . present placement of the anti-vibration sheet on the outer surface of the back door
6
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panel gets necessary support from the back door outer panel and prevents peeling
off the anti-vibration sheet due to weight of the same in vertical downward
direction.
[0027] It should be noted that the description and figures merely illustrate the
5 principles of the present subject matter. It should be appreciated by tho~e skilled
in the art that conception and spt:cific embodiment disclosed may be readily
utilized_ ~s ~ ~a_s~ f'or Jl10_dlfyinggr_Qe~jgojng other structures for r.::trrying-eut-the
same purposes of the present subject matter. It should also be appreciated by those
skilled in the art that by devising various arrangements that, although not
10 explicitly described or shown herein, embody the principles of the present subject
matter and are included within its spirit and scope. Furthermore, all examples
recited herein are principally intended expressly to be for pedagogical purposes to
aid the reader in understanding the principles of the present subject matter and the
concepts contributed by the inventor(s) to furthering the art; and are to be
15 construed as being without limitation to such specifically recited examples and
conditions. The novel features which are believed to be characteristic of the
present subject matter, both as to its organi:zation and method of operation,
together with further objects and advantages will be better understood from the
following description when considered in connection· with the accompanying
20 figures.
[0028] These and other advantages of the present subject matter would be
described in greater detail with reference to the following figures. It should be
noted that the description merely illustrates the principles of the present subject
matter. It will thus be appreciated that those.skilled in the art will be able to devise
25 various arrangements that, although not explicitly described herein, embody the
principles of the present subject matter and CJ,re included within its scope.
[0029] Fig. 5 illustrates placement of anti-vibration sheet between back door glass
and the hack door outer panel of the vehicle, in accordance with an embodiment
of the present subject matter. The present back door assembly comprises a back
30 door panel 1 and back door glass 4. Further, the back door panel 1 comprises back
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door outer panel 3 and back door inner panel 2. The inner and outer panel of the
back ·door forms a box section area in the back door panel 1. In the box section
area, back door harness can move easily for functioning of back door
functionalities, such as tail light, rear viper, sensors.
5 [0030] In the present embodiment, an anti-vibration sheet 7 is disposed between·
the back door glass 4 and ua~.;k door outer panel 3 of the vehicle. Further, the antivibration
sheet 7 is pasted on outer surface of the ha~k door outer panel 3 from the
outer side. The material of the anti-vibration sheet is governed by the following
factors:
10 - Sufficient dead weight
- Vibration absorption characteristics.
[0031] The·anti-vibration sheet 7 may be a butyl adhesive sheet. The material of
anti vibration sheet 7 is such as Glass cloth & butyl adhesive without restricting
scope of the invention to the same. Thus, other materials readily apparent to a
15 personal skilled in the art are understood to be within the scope of invention.
Further, thickness of the anti-vibration sheet 7 is in the range of 1-6 mm
preferably 3 mm for best results.
[0032] In the present embodiment, the back door harness 5 can move easily
without any interference with the anti-vibration sheet 7 because anti-vibration
20 sheet 7 is pasted on outer surface of the back door outer panel 3 from the outer
side.
[0033] Fig. 6 illustrates weight distribution of the anti-vibration sheet on the back
door outer panel of the vehicle, iri. accordance with an embodiment of the present
subject matter. The anti-vibration sheet 7 is disposed between the back door glass
25 4 and back door outer panel 3 of the vehicle. Further, the anti-vibration sheet 7 is
pasted on outer surface of the back door outer panel 3 from the outer side. In the
present structure, the weight of the anti-vibration sheet 7 is equally distributed
over the outer surface of the back door outer panel 3. The anti-vibration sheet 7 is
completely supported by the back door outer panel. The anti-vibration sheet 7
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does not peel off from the back door outer panel 3 as its weight is -equally
distributed over the back door outer panel 3. Therefore, present structure prevents
peeling off the anti vibration sheet 7 from the back door outer panel 3.
[0034) Although embodiments for the pn:st:nt subject matter have been described
5 in language specific to structural features, it is to be understood that the present
subject mutter is not necessarily limited to the specific features described. Rather,
the specific features and methods are disclosed as embodiments for the present
subject matter. Numerous modifications and adaptations of the system/device of
the present invention will be apparent to those skilled in the art, and thus it is
10 intended by the appended claims to cover all such modifications and adaptations
which fall within the scope of the present subject matter.

We claim:
1. A back <;loor assembly for damping vibrations in vehicle comprising:
a back door panel;
.a back door glass mountt:u un the back door panel; and
a anti-vibration sheet is disposed between the back door glass and the
buck door panel from outer side.
2. The back door assembly as claimed in claim 1, wherein the back door panel
includes back door inner panel and back door outer panel.
3. The back door assembly as claimed in claim 1, wherein the anti-vibration
sheet is disposed on outer surface of the back door outer panel from outer
side.
15 4. The back door assembly as claimed in claim 1, wherein the anti-vibration
sheet is such as Glass cloth & butyl adhesive having sufficient dead weight
and vibration absorption characteristics.
5. The back door assembly as claimed in claim 1, wherein the back door panel
is mounted on the rear side of vehicle.
6. The back door assembly as claimed in claim 1, wherein thickness of the antivibration
sheet is in the range of 1-6 mm preferably 3mm.
25 7. The back door assembly as claimed in claim 1, wherein the anti-vibration
sheet comprises an adhesive sheet which is pasted on the outer surface of the
back door outer panel.