FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See Section 10; rule 13)
TITLE OF THE INVENTION
Twist Beam Stabilizer Bar End Mounting Assembly For Rear Suspension Of Vehicle



APPLICANTS
TATA MOTORS LIMITED, an Indian company
Having its registered office at Bombay House,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
INVENTORS
Santosh Kumar Singh, Samir Ghodekar,
Gautam Pingale, Amol Apte & Suyog M Panse
All are Indian Nationals
of TATA MOTORS LIMITED,
An Indian company having its registered office
at Bombay House, 24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India

PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner
in which it is to be performed.


FIELD OF INVENTION
The present invention is related to suspension system of vehicle and more particular this invention is related to twist beam stabilizer bar end mounting assembly for rear suspension of vehicle.
BACKGROUND OF INVENTION
A conventional twist beam comprises of two trailing arms connected by a cross member. Generally an additional hollow tubular element or a solid rod is incorporated inside the cross beam to increase the strength and stiffness of the structure. If the stiffness of the stabilizer bar is too high it produces high stress at the end mounting leading to the failure of end mounting. Since there is no flat surface available for welding at end mounting , the welding is not good due to non availability of flat surface, hence the failure of end mounting is inevitable. Another difficulty in welding the stabilizer to the trailing arm is the non accessibility of the weld torch at the joinery due to the profile of the trailing arm and the location of the said joinery on the trailing arm. The twist beam stabilizer bar end mounting assembly for rear suspension of vehicles is developed which overcomes above stated disadvantages.
OBJECTS OF INVENTION
The main object of the present invention is to provide twist beam stabilizer bar end mounting assembly for rear suspension of vehicle.
Another object of the present invention is to provide a method of mounting twist beam stabilizer bar.
Another object of the present invention is to provide a twist beam stabilizer bar end mounting assembly for rear suspension of vehicle having good mounting surface for
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the end mounting of the said stabilizer bar.
Another object of the present invention is to provide a twist beam stabilizer bar end mounting assembly for rear suspension of vehicle having strength to the end mounting of the said stabilizer bar to withstand roll fatigue to which the twist beam is subjected.
Yet another object of the invention is to provide a twist beam stabilizer bar end mounting assembly for rear suspension of vehicle having good weld quality of end of mounting joinery of the said stabilizer bar and the trailing arm.
Yet another object of the invention is to provide a twist beam stabilizer bar end mounting assembly for rear suspension of vehicle having good accessibility for the weld torch to weld the end mounting of the said stabilizer bar.
Another object of the invention is to provide a twist beam stabilizer bar end mounting assembly for rear suspension of vehicle which is better roll stiffness to the vehicle by providing suitable distance between the end mountings of the twist beam on both side of the vehicle.
Another object of the invention is to provide a twist beam stabilizer bar end mounting assembly for rear suspension of vehicle which reduces the weight of the trailing arm and thus reduction in twist beam weight.
SUMMARY OF INVENTION
In accordance with the present invention, twist beam stabilizer bar end mounting assembly for rear suspension of vehicle comprises; a trailing arm (1), a stabilizer bar (2) , a structural component (3) configured to be provided on said trailing arm (1), said structural component (3) having hole (6) provided therein through which the stabilizer bar (2) passes and welded (4) to the said structural component (3), said
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structural component (3) is box shaped structural component having thickness equal to / or higher than that of the said trailing arm (1).
Wherein said structural component (3) is integrated to said trailing arm (1) connected to said trailing arm (1), The said hole (6) provided on said box shape structure contains the end of the stabilizer bar (2). The said stabilizer bar end is welded (4) to the said box shaped structure.
Wherein said structural component (7) is a separate box shaped structural bracket (7) connected to say trailing arm (1) through bolts (10). The said hole (11) provided on said box shape structural bracket contains the end of the stabilizer bar (2). The said stabilizer bar end is welded (9) to the said box shaped structural bracket (7).
Wherein said structural component (8) is a separate box shaped structure (8) connected to say trailing arm (1) through weld (13), The hole (11) provided on said box shape structure (8) contains the end of the stabilizer bar (2). The said stabilizer bar end is welded (9) to the said box shaped structural component (8).
STATEMENT OF INVENTION
Accordingly the present invention discloses the twist beam stabilizer bar end mounting assembly for rear suspension of a vehicle comprising;
structural components adapted on trailing arms, consisting hole constituted to adapt the ends of the stabilizer bar to protrude through it;
said stabilizer bar configured to be welded with said structural components at both protruded ends for increasing strength and stiffness of the structure of said end mounting assembly;
a surface of said structural component adapted for accessibility of weld torch configured to facilitate welding of said structural component with stabilizer bar.
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BRIEF DESCRIPTION OF DRAWINGS
In accordance to the present invention
Figure 1 shows complete Twist Beam welded Structure
Figure 2 shows the hydro formed trailing arm with box shaped structure
Figure 3 shows cross section of the assembly of hydro formed trailing arm with
box shaped structure and stabilizer bar Figure 4 shows box bracket bolted to trailing arm Figure 5 shows box bracket bolted to trailing arm and stabilizer bar welded to
box bracket Figure 6 shows box bracket welded to trailing arm Figure 7 shows box bracket welded to trailing arm and stabilizer bar
DETAILED DESCRIPTION OF INVENTION
Referring now to the drawings where in the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same.
Now referring to figure-01-07, In accordance with the present invention, twist beam stabilizer bar end mounting assembly for rear suspension of vehicle comprises; a trailing arm (1), a stabilizer bar (2) , a structural component (3) configured to be provided on said trailing arm (1), said structural component (3) having hole (6) provided therein through which the stabilizer bar (2) passes and welded (4) to the said structural component (3), said structural component (3) is box shaped structural component having thickness equal to / or higher than that of the said trailing arm (1). Wherein said structural component (3) is integrated to said trailing arm (1) connected to said trailing arm (1), The said hole (6) provided on said box shape structure contains the end of the stabilizer bar (2). The said stabilizer bar end is welded (4) to the said box shaped structure.
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Wherein said structural component (7) is a separate box shaped structural bracket (7) connected to said trailing arm (1) through bolts (10), The said hole (11) provided on said box shape structural bracket contains the end of the stabilizer bar (2). The said stabilizer bar end is welded (9) to the said box shaped structural bracket (7).
Wherein said structural component (8) is a separate box shaped structure (8) connected to say trailing arm (1) through weld (13), The hole (11) provided on said box shape structure (8) contains the end of the stabilizer bar (2). The said stabilizer bar end is welded (9) to the said box shaped structural component (8).
Wherein said structural component (3) is integrated to said trailing arm (1) connected to said trailing arm (1), the said structural component (3) of desired thickness in the said trailing arm (1) by means of hydro-forming or by any other means. The box shaped structure (3) has a hole or slot (6) of the same profile matching the profile of the said stabilizer bar end .
The said box shaped structure with the said hole profile is welded or rigidly connected by any other conventional joining means to the stabilizer bar end on both sides of vehicle. The welding surface of said box shaped structure is flat and normal to the stabilizer bar. Alternately the welding surface of the said box shaped structure can be at any angle to the stabilizer bar axis limited by the weld torch accessibility and or limited by the permitted weld toe angle between stabilizer bar and said box structure for good welding properties.
Alternately the said box shaped structure used above in accordance with the present invention can be made as a separate part and joined to the said trailing arm by conventional joining means such as welding or bolting.
Now referring to figure 1,2 and 3 wherein the said trailing arm (1) is provide with a box shaped structure (3) which is integral with trailing arm (1). The thickness of the said box shaped structure (3) can be equal to or greater than the thickness of the said
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trailing arm (1) wherein said stabilizer bar (2) is inserted into the said trailing arm hole (6) and the stabilizer bar (2) end come out of the box shaped structure hole (6). Wherein the outer surface (5) of the said box shaped structure (3) is flat and normal to the axis of the said stabilizer bar (2) to provide good weld torch accessibility and good weld properties, wherein the outer surface of said box shaped structure (3) is not limited being flat and normal, it can be of any shape and at any angle to the stabilizer bar axis to provide good accessibility to weld torch and good welding properties, wherein the said stabilizer bar (2) is welded (4) to the said box shaped structure (3) on its outer surface (5) on both sides of vehicle.
Now referring figure -04 and 05, wherein the separate box shaped bracket (7) of desire thickness is bolted (10) to said trailing arm (1), wherein the box bracket (7) has a hole (11) matching the profile of the stabilizer bar (2) end , wherein the outer surface (12) of the box bracket (7) is flat and normal to the said stabilizer bar (2),wherein the outer surface (12) of the said box bracket (7) is not limited to being flat and normal to the said stabilizer bar (2) axis, it can be of any shape and at any angle to said stabilizer bar (2) axis restricted by good weld torch approach and good weld properties, wherein stabilizer bar (2) end is welded (9) to the box bracket (7) on the outer surface (12) on both side of the vehicle.
Now referring figure -06 and 07, wherein the separate box shaped structure (8) of desire thickness is welded (13) to said trailing arm (1), wherein the box shaped structure (8) has a hole (11) matching the profile of the stabilizer bar (2) end , wherein the outer surface (12) of the box shaped structure(8) is flat and normal to the said stabilizer bar (2),wherein the outer surface (12) of the said box shaped structure (8) is not limited to being flat and normal to the said stabilizer bar (2) axis, it can be of any shape and at any angle to said stabilizer bar (2) axis restricted by good weld torch approach and good weld properties, wherein stabilizer bar (2) end is welded (9) to the box shaped structure ( 8 ) on the outer surface (12) on both side of the vehicle.
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The foregoing description is a specific embodiment of the prevent invention. It should be appreciated that this embodiment is describe for this purpose of illustration only and that numerous alteration and modification may be practiced by those skill in the art without departing from the spirit and scope of the invention. It is intended that all such modification and alteration included in so far as they come within the scope of the invention as clamed the equivalent thereof.

WE CLAIM
1. The twist beam stabilizer bar end mounting assembly for rear suspension of a
vehicle comprising;
structural components adapted on trailing arms, consisting hole constituted to adapt the ends of the stabilizer bar to protrude through it;
said stabilizer bar configured to be welded with said structural components at both protruded ends for increasing strength and stiffness of the structure of said end mounting assembly;
surface of said structural component adapted for accessibility of weld torch configured to facilitate welding of said structural component with stabilizer bar.
2. The end mounting assembly as claimed in claim 1, wherein said stabilizer bar is provided to increase and stiffness of the structure of said end mounting assembly.
3. The end mounting assembly as claimed in claim 1, wherein said trailing arm comprises at least one said structural component.
4. The end mounting assembly as claimed in claim 1, wherein said structural component is a box shaped structure which is an integral part of said trailing arm.
5. The end mounting assembly as claimed in claim 1, wherein said structural component is a box shaped structure which is fastened to said trailing arm by bolts.
6. The end mounting assembly as claimed in claim 1, wherein said structural component is a box shaped structure which is welded to said trailing arm.
7. The end mounting assembly as claimed in claim 1, wherein the thickness of said structural component is equal to or greater than the thickness of the said trailing arm.
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8. The end mounting assembly as claimed in any one of the preceding above claims, wherein said end mounting assembly increases the accessibility of the weld torch at the joinery on the trailing arms, to improve the weld quality of the joinery of said stabilizer arm and said trailing arms.
9. The twist beam stabilizer bar end mounting assembly for rear suspension of a vehicle substantially as herein above described and as illustrated in accompanying drawings.
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Dated this 23rd day of March 2009