DESC:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of invention:
AN INTEGRATED GIRDER ASSEMBLY FOR AN UNDERFRAME OF A VEHICLE

Applicant:
BEML Limited
A company Incorporated in India under the Companies Act, 1956
Having Address As:
BEML Soudha, 23/1, 4th Main,
Sampangirama Nagar, Bengaluru - 560 027,
Karnataka, India

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

CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] The present invention claims priority from Indian patent application numbered IN 202441017517 filed on 11th March, 2024.

FIELD OF THE INVENTION
[002] The present invention relates to an underframe of a vehicle. More particularly, the present invention relates to an integrated girder assembly for the underframe of the vehicle to enhance stability and adaptability.

BACKGROUND

[003] Vehicles are purpose-built, self-propelled vehicles designed for a wide range of tasks such as transportation of goods and people, maintenance and many more. A typical rail vehicle comprises several essential components viz two outer longitudinal members, two middle longitudinal members, sill assemblies, bolster assemblies and several cross members all together forms the underframe. The underframe serves as a primary load-carrying component. The underframe acts as a linear protrusion consisting of rails arranged parallel to each other and securely welded with cross members and further welded to vehicle body, forming a robust structure. This structure works together to distribute and withstand forces and loads experienced during operation. Forces such as vertical loads, lateral forces, and torsional stresses that occur during acceleration, deceleration, and cornering. The welded connection between the underframe and the vehicle ensures a rigid and stable structure, which enhances the overall stability and safety of the rail vehicle.
[004] Structure of the underframe plays vital role in safety of any vehicle, it incorporates safety features to protect the vehicle's occupants in the event of accidents. These safety measures includes energy-absorbing crush zones to mitigate collision impact forces and rollover protection systems to prevent the vehicle from overturning. The role of the underframe structure is critical for performance, safety, and reliability of the vehicle. The design and construction of the underframe structure directly impact the overall effectiveness and functionality of the vehicle.
,

Cited Prior arts
Some of the relevant patents disclosing the underframe assemblies of vehicles are as follows:
[005] In prior art RU183178U1 (reference figure 1) discloses a frame for railway platform for large container comprising a shortened spinal beam (8), side beams (2) of I beam section, braces (9), pivot beam (3), frontal beam (4), cross beams (4), and also fitting stops (6, 7).The platform is made of a long-base and the shortened spinal beam (8) with a box-shaped section and the execution of vertical sheets of variable thickness and is additionally provided with a figured sheet below.
[006] In prior art EP3708453A1 (reference figure 2) discloses the outer support structures (2A, 2B) of an underframe of a vehicle are constructed as spatial or planar framework structures which have serially interconnected framework profiles (24, 25) connecting an upper longitudinal member (21) and a lower longitudinal member (22) to one another in this way that two adjacent truss profiles (24, 25) together with the upper or lower longitudinal member (21; 22) form a triangle (D1 A1 , D2 A1 , D1 A2 , D2 A2 ) with three nodes.
[007] The existing designs of a vehicle’s body (100) (reference figure 3) is of underframe chassis, in which the underframe (102) is welded to the vehicle’s (100) body structure, creating an integral assembly and also the rails are securely welded with cross assembly (112). But, the same underframe (102) cannot be used in open type platform, which undergoes bending and buckling loads resulting in excessive deformation and deflection.
[008] Hence, an improved underframe structure is needed to overcome the aforesaid drawbacks.

OBJECTS OF THE INVENTION

[009] Main object of the present disclosure is to provide an integrated girder assembly for an underframe of a vehicle with optimum material.
[0010] Another objective of the present disclosure is to provide the integrated girder assembly for the underframe of the vehicle which enables it to withstand demanding operational conditions.
[0011] Yet another objective of the present disclosure is to provide the integrated girder assembly with variable cross section.
[0012] Another objective of the present disclosure is to provide the integrated girder assembly for the underframe of the vehicle with increased protection to the vehicle's occupants in the event of accidents or collisions.
[0013] Yet another objective of the present disclosure is to provide the integrated girder assembly for the underframe of the vehicle which is simple, cost effective and easy to access.

SUMMARY

[0014] The present invention discloses an integrated girder assembly for an underframe of a vehicle, it is to be understood that this application is not limited to a particular vehicle as there may be multiple possible embodiments, which are not expressly illustrated in the present disclosures. It is also to be understood that the terminology used in the description is for the purpose of describing the particular implementations, versions, or embodiments only, and is not intended to limit the scope of the present application. This summary is provided to introduce aspects related to the integrated girder assembly for the underframe of the vehicle. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.
[0015] The present invention discloses an integrated girder assembly for an underframe of a vehicle comprises the underframe provided for carrying load of the vehicle; a sole bar assembly provided with longitudinal beams; the integrated girder assembly mounted on the bottom surface of the sole bar assembly; and plurality of outside gussets extended vertically on the sole bar assembly and the integrated girder assembly provided to strengthen the underframe wherein, the integrated girder assembly is provided with plurality of girder plates, plurality of reinforced gussets and a girder support.
[0016] The present invention also discloses the integrated girder assembly is provided with variable cross section along its length. The integrated girder assembly is provided with a hollow section reinforced with plurality of reinforced gussets and plurality of cut-out sections. The plurality of reinforced gussets are provided with a strip provided with a bend at center reinforced at predefined locations inside the integrated girder assembly. The plurality of cut-out sections are provided at predefined locations for providing access to the aggregates mounted below the underframe. The integrated girder assembly is provided with a high corrosion resistance alloy steel viz corten steel and alike material. The plurality of girder plates, plurality of reinforced gussets and a girder support are provided with the thickness in the range of 6 mm to 10 mm. Edges of distal ends of the integrated girder assembly are inclined at a predefined angle with the sole bar assembly. The predefined angle is configured to be in the range of 100° to 120°. The underframe is provided to mount the vehicle body.
[0017] The present invention provides an efficient underframe structure providing improved performance, durability, and longevity, meeting the rigorous demands of the vehicle. The incorporation of the variable cross-section in the integrated girder assembly and further integrating to the underframe of the vehicle improves structural efficiency with efficient utilization of materials. The optimized plate thickness and shape of high-strength structural steel based on load distribution, the underframe achieves maximum strength and stiffness wherever required. The underframe not only improves performance and durability but also enhances safety. By incorporating features such as crush zones and rollover protection systems, further enhances the safety measures of the railway maintenance vehicle.

STATEMENT OF INVENTION

[0018] The present invention discloses an integrated girder assembly for an underframe of a vehicle comprises the underframe provided for carrying load of the vehicle; a sole bar assembly provided with longitudinal beams; the integrated girder assembly mounted on the bottom surface of the sole bar assembly; and plurality of outside gussets extended vertically on the sole bar assembly and the integrated girder assembly to strengthen the underframe wherein, the integrated girder assembly is provided with plurality of girder plates, plurality of reinforced gussets and a girder support.
[0019] The present invention also discloses the integrated girder assembly is provided with variable cross section along its length. The integrated girder assembly is provided with a hollow section reinforced with plurality of reinforced gussets and plurality of cut-out sections. The plurality of reinforced gussets are provided with a strip provided with a bend at center reinforced at predefined locations inside the integrated girder assembly. The plurality of cut-out sections are provided at predefined locations for providing access to the aggregates mounted below the underframe. The integrated girder assembly is provided with a high corrosion resistance alloy steel viz corten steel and alike material. The plurality of girder plates, plurality of reinforced gussets and a girder support are provided with the thickness in the range of 6 mm to 10 mm. Edges of distal ends of the integrated girder assembly are inclined at a predefined angle with the sole bar assembly. The predefined angle is configured to be in the range of 100° to 120°. The underframe is provided to mount the vehicle body.

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The foregoing summary, as well as the following detailed description of embodiments, is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the disclosure, there is shown in the present document example constructions of the disclosure. The detailed description is described with reference to the following accompanying figures.
[0021] Figure 1 illustrates prior art related to a frame for railway platform.
[0022] Figure 2 illustrates prior art related to an underframe for a vehicle.
[0023] Figure 3(a), figure 3(b) and figure 3(c) illustrates prior art related to existing car body structure used for a railway vehicle.
[0024] Figure 4 (a) and figure 4 (b) illustrates schematic views of an integrated girder assembly of an underframe of a vehicle in a preferred embodiment of the present invention.
[0025] Figure 5(a), figure 5(b) and figure 5(c) illustrates schematic views of the integrated girder assembly of the underframe of the vehicle subjected to various bending loads and buckling loads in a preferred embodiment of the present invention.
[0026] Figure 6 illustrates a sectional view of the integrated girder assembly of the underframe structure of the vehicle in a preferred embodiment of the present invention.
[0027] Figure 7(a) and figure 7 (b) illustrates various sectional views of the underframe of the vehicle showing structural details of the integrated girder assembly in a preferred embodiment of the present invention.
[0028] Figure 8 (a) and figure 8 (b) illustrates various sectional views of the integrated girder assembly of the underframe of the vehicle in a preferred embodiment of the present invention.
[0029] Figure 9 (a), figure 9 (b) and figure 9 (c) illustrates various schematic views of an integrated girder assembly of the underframe of the vehicle in a preferred embodiment of the present invention.
[0030] The figure depicts various embodiments of the present disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following discussion that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION OF INVENTION

[0031] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising", “having”, and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Although any devices and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary, devices and methods are now described. The disclosed embodiments are merely exemplary of the disclosure, which may be embodied in various forms.
[0032] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art will readily recognize that the present disclosure is not intended to be limited to the embodiments illustrated, but is to be accorded the widest scope consistent with the principles and features described herein.
[0033] The present subject matter discloses an integrated girder assembly (122) for an underframe (102) of a vehicle (100) as shown in figure 4(a). The vehicle (100) refers to heavy duty vehicles or a railway vehicle, a wagon or a Catenary Maintenance Vehicle (CMV). As shown in figure 4 (a), the vehicle (100) mounts one or more cabins (104) on the underframe (102). As per one on the embodiment, the vehicle (100) is CMV. The underframe (102) comprises plurality of structural members. Figure 4 (b) discloses, the underframe (102) of the vehicle (100) comprising sole bar assemblies (120), sill assembly centre (106), bolster assemblies (108), channel assemblies (112), sole bar stiffeners (114), cross beam assembly (116), bolts, washers and nuts (118), integrated girder assemblies (122) and plurality of outside gussets (130). The underframe (102) serves as a primary load-carrying component. The integrated girder assembly (122) is mounted on both longitudinal sides of the underframe (102). The integrated girder assembly (122) is welded to the sole bar assembly (120) on both longitudinal sides of the underframe (102). Further, plurality of outside gussets (130) are mounted on both sides of integrated girder assembly (122) and the sole bar assembly (120) to strengthen the underframe (102).
[0034] In an embodiment, referring to figure 5(a), figure 5(b) and figure 5(c), the integrated girder assembly (122) of the underframe (102) is subjected to various loads. Figure 5(a) discloses a front view of the vehicle (100) mounted with cabinets (104) on both distal ends of the underframe (102) and payload acting at the center of the underframe (102). Figure 5(b) discloses the underframe (102) of the vehicle (100). Figure 5(c) discloses loading condition of the underframe (102). The underframe (102) undergoes bending and buckling loads. The upper portion of the underframe (102) is under compression and the lower portion is under tension during bending load as shown in figure 5(c). The buckling load makes the underframe (102) to crumble along the longitudinal direction. The variable cross section of integrated girder assembly (122) is provided to improve the stiffness of the underframe (102) and the ability to withstand higher payloads. However, the dimensions of the integrated girder assembly (122) varies with specification of the vehicle (100) and various loads acting on it.
[0035] In an embodiment, referring to figure 6, figure 6 discloses a sectional view of the underframe (102) of the vehicle (100). The underframe (102) longitudinally mounts the sole bar assembly (120) on both upper left and upper right side. The integrated girder assembly (122) is welded to the sole bar assembly (120) on bottom surface of the sole bar assembly (120). Further, the distal ends of the cross beam assembly (116) is welded to the integrated girder assembly (122). Plurality of outside gussets (130) are mounted on both sides of integrated girder assembly (122). The variable cross-section of the integrated girder assembly (122) allows for more efficient utilization of materials. The integrated girder assembly (122) provides higher section modulus in areas of the cross-section which is subjected to higher loads.
[0036] Now referring to figure 7(a), figure 7(b), figure 7(c) and figure 7(d) relates to the underframe (102) of the vehicle (100) with sections A-A and B-B. Figure 7 (a) discloses the underframe (102) with section lines A-A and B-B. Figure 7(b) discloses the sectional view at section A-A of the underframe (102). Figure 7(c) discloses the sectional view at section B-B of the underframe (102). Figure 7 (d) discloses a sectional front view of the integrated girder assembly (122). As per one of the embodiment, the cross section of the integrated girder assembly (122) varies along the length and height at both ends of girder plate maintaining an angle of 115° which is welded to the sole bar assembly (120) to withstand the higher payload.
[0037] Now referring to figure 8(a) and figure 8 (b), figure 8 (a) discloses a sectional view of the integrated girder assembly (122). The integrated girder assembly (122) is integrated at the bottom surface of the sole bar assembly (120) by welding. Figure 8 (b) discloses a sectional view of the integrated girder assembly (122) with its components. The integrated girder assembly (122) is comprising plurality of girder plates (124), plurality of reinforced gussets (126) and girder support (128). The integrated girder assembly (122) is a hollow section formed by plurality of girder plates (124) from three sides and the girder support (128) from bottom. The plurality of reinforced gussets (126) mounted inside the integrated girder assembly (122). The stiffness of the integrated girder assembly (122) increases by reinforcing plurality of gussets (126) inside the integrated girder assembly (122) at predefined locations. The thickness of the girder plates (124) and girder support (128) of the integrated girder assembly (122) is maintained up to 10 mm and the thickness of the reinforced gussets (126) of the integrated girder assembly (122) is maintained up to 8 mm. Further, plurality of outside gussets (130) are extended vertically on the sole bar assembly (120) and the integrated girder assembly (122) to strengthen the underframe (102). The variable cross-section of the integrated girder assembly (122) allows for more efficient utilization of materials. The integrated girder assembly (122) provides higher section modulus in areas which is subjected to higher loads.
[0038] Now referring to figure 9 (a), figure 9(b) and figure 9(c), figure 9 (a) relates to a sectional isometric view of the integrated girder assembly (122). Figure 9 (b) discloses a sectional front view of the integrated girder assembly (122). Figure 9 (c) discloses a sectional side view of the integrated girder assembly (122). The girder plates (124) are provided with cut-out sections (132) in the integrated girder assembly (122) at various predefined locations forming the variable cross section along the length of the girder assembly (122). The plurality of reinforced gussets (126) and cut-out sections (132) provided in the girder plate (124) together forms the variable cross-section in the integrated girder assembly (122), which is further integrated into the underframe (102). The stiffness of the integrated girder assembly (122) increases by reinforcing plurality of gussets (126) and providing cut-out sections (132) in the integrated girder assembly (122) at various predefined locations. Further, the cut-out sections (132) facilitates an access to the aggregates mounted below the underframe (102). The integrated girder assembly (122) comprises girder plates (124) sandwiching plurality of reinforced gussets (126) and plurality of cut-out sections (132) at predefined locations in the integrated girder assembly (120), which provides resistance to bending under higher loading points. The plurality of reinforced gussets (126) and plurality of cut-out sections (132) along the length of the integrated girder assembly (122) are provided for optimizing load distribution and structural efficiency of the underframe (102). The channel assembly (112) is connected to the integrated girder assembly (122) with variable cross section at various locations as shown in figure 9(c).
[0039] As per one of the embodiment, plurality of girder plates (124), girder support (128) and plurality of reinforced gussets (126) of the integrated girder assembly (122) are made of IRS M-41/97 and alike materials. The material is high-strength structural steel e.g. corrosion resistance corten steel used in the vehicles. The sheets of the high-strength structural steel are specifically formed for the vehicle body because of its high corrosion resistance and offering excellent performance at high and elevated temperatures. The corten steel is also known as weathering steel as it gets stable rust appearance and eliminates the need of painting. The sheets of high-strength structural steel possesses 340 MPa minimum yield strength and 480 MPa minimum tensile strength.
[0040] The present invention provides an efficient underframe structure providing improved performance, durability, and longevity, meeting the rigorous demands of the vehicle. The structure of underframe also ensures the safety and reliability of the vehicle. The incorporation of the variable cross-section in the integrated girder assembly (122) and further integrating to the underframe (102) of the vehicle improves structural efficiency with efficient utilization of materials. The optimized plate thickness and shape of high-strength structural steel based on load distribution, the underframe (102) achieves maximum strength and stiffness wherever required. As the one embodiment, the optimized structural integrity of the underframe (102) enables it to withstand demanding operational conditions, ensuring long-term reliability and minimizing the risk of structural failures or deformations during maintenance tasks performed by CMV. The underframe (102) not only improves performance and durability but also enhances safety. As per an embodiment, by incorporating features such as crush zones and rollover protection systems, further enhances the safety measures of the railway maintenance vehicle.
[0041] Further, the invention can be used, but not limited to, in the following applications.
[0042] Exemplary embodiments discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include the following.
[0043] The present invention discloses an integrated girder assembly (122) for an underframe (102) of a vehicle (100) comprises the underframe (102) provided for carrying load of the vehicle (100); a sole bar assembly (120) provided with longitudinal beams; the integrated girder assembly (122) mounted on the bottom surface of the sole bar assembly (120); and plurality of outside gussets (130) extended vertically on the sole bar assembly (120) and the integrated girder assembly (122) to strengthen the underframe (102) wherein, the integrated girder assembly (122) is provided with plurality of girder plates (124), plurality of reinforced gussets (126) and a girder support (128).
[0044] The present invention also discloses the integrated girder assembly (122) is provided with variable cross section along its length. The integrated girder assembly (122) is provided with a hollow section reinforced with plurality of reinforced gussets (126) and plurality of cut-out sections (132). The plurality of reinforced gussets (126) are provided with a strip provided with a bend at center reinforced at predefined locations inside the integrated girder assembly (122). The plurality of cut-out sections (132) are provided at predefined locations for providing access to the aggregates mounted below the underframe (102). The integrated girder assembly (122) is provided with a high corrosion resistance alloy steel viz corten steel and alike material. The plurality of girder plates (124), plurality of reinforced gussets (126) and a girder support (128) are provided with the thickness in the range of 6 mm to 10 mm. Edges of distal ends of the integrated girder assembly (122) are inclined at a predefined angle with the sole bar assembly (120). The predefined angle is configured to be in the range of 100° to 120°. The underframe (102) is provided to mount the vehicle body.
[0045] Some embodiments of the present subject matter is to provide an integrated girder assembly for an underframe of a vehicle utilizing optimum material.
[0046] Some embodiments of the present subject matter is to provide an integrated girder assembly for the underframe of the vehicle with an optimized structural integrity of the underframe enables it to withstand demanding operational conditions.
[0047] Some embodiments of the present subject matter is to provide the integrated girder assembly with variable cross section.
[0048] Some embodiments of the present subject matter is to provide the integrated girder assembly for the underframe of the vehicle with increased protection to the vehicle's occupants in the event of accidents or collisions.
[0049] Some embodiments of the present subject matter is to provide the integrated girder assembly for underframe of the vehicle which is simple, cost effective and easy to access.
[0050] Following is a list of elements and reference numerals used to explain various embodiments of the present subject matter.
Reference number Name of the component
100 Vehicle
102 Underframe
104 Cabin
106 Sill Assembly Centre
108 Bolster Assembly
110 Bolster Centre
112 Channel Assembly
114 Sole Bar Stiffeners
116 Cross Beam Assembly
118 Bolts, washers & nuts
120 Sole Bar Assembly
122 Integrated girder assembly
124 Girder plates
126 Plurality of reinforced gussets
128 Girder support
130 Plurality of outside gussets
132 Cut-outs Sections

Equivalents
[0037] With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
[0038] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as "open" terms (e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an" (e.g., "a" and/or "an" should typically be interpreted to mean "at least one" or "one or more"); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of "two recitations," without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to "at least one of A, B, and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances, where a convention analogous to "at least one of A, B, or C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, or C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "A or B" will be understood to include the possibilities of "A" or "B" or "A and B."
[0039] Although implementations for an integrated girder assembly for an underframe of a vehicle have been described in language specific to structural features and/or methods, it is to be understood that the appended claims are not necessarily limited to the specific features described. Rather, the specific features are disclosed as examples of implementation for the integrated girder assembly for the underframe of the vehicle.
,CLAIMS:
1. An integrated girder assembly (122) for an underframe (102) of a vehicle (100) comprises:
the underframe (102) configured for carrying load of the vehicle (100);
a sole bar assembly (120) configured with longitudinal beams;
the integrated girder assembly (122) configured to be mounted on the bottom surface of the sole bar assembly (120); and
plurality of outside gussets (130) configured to be extended vertically on the sole bar assembly (120) and the integrated girder assembly (122) to strengthen the underframe (102) wherein, the integrated girder assembly (122) is configured with plurality of girder plates (124), plurality of reinforced gussets (126) and a girder support (128).
2. The integrated girder assembly (122) for the underframe (102) of the vehicle (100) as claimed in claim 1 wherein, the integrated girder assembly (122) is configured with variable cross section along its length.
3. The integrated girder assembly (122) for the underframe (102) of the vehicle (100) as claimed in claim 1 wherein, the integrated girder assembly (122) is configured with a hollow section reinforced with plurality of reinforced gussets (126) and plurality of cut-out sections (132).
4. The integrated girder assembly (122) for the underframe (102) of the vehicle (100) as claimed in claim 1 wherein, plurality of reinforced gussets (126) are configured with a strip provided with a bend at center reinforced at predefined locations inside the integrated girder assembly (122).
5. The integrated girder assembly (122) for the underframe (102) of the vehicle (100) as claimed in claim 3 wherein, the plurality of cut-out sections (132) are configured at predefined locations for providing access to the aggregates mounted below the underframe (102).
6. The integrated girder assembly (122) for the underframe (102) of the vehicle (100) as claimed in claim 1 wherein, the integrated girder assembly (122) is configured with a high corrosion resistance alloy steel viz corten steel and alike material.
7. The integrated girder assembly (122) for the underframe (102) of the vehicle (100) as claimed in claim 1 wherein, plurality of girder plates (124), plurality of reinforced gussets (126) and a girder support (128) are configured with thickness in the range of 6 mm to 10 mm.
8. The integrated girder assembly (122) for the underframe (102) of the vehicle (100) as claimed in claim 1 wherein, edges of distal ends of the integrated girder assembly (122) are configured to be inclined at a predefined angle with the sole bar assembly (120).
9. The integrated girder assembly (122) for the underframe (102) of the vehicle (100) as claimed in claim 8 wherein, the predefined angle is configured to be in the range of 100° to 120°.
10. The integrated girder assembly (122) for the underframe (102) of the vehicle (100) as claimed in claim 1 wherein, the underframe (102) is configured to mount the vehicle body.