DESC:TECHNICAL FIELD
[0001] The subject matter described herein, in general, relates to a rear suspension for a two wheeled vehicle and more particularly to a swing arm assembly for a two wheeled vehicle.

BACKGROUND
[0002] Generally, in a two wheeled vehicle, a vehicle frame assembly acts as a skeleton for the vehicle that supports the vehicle loads. A front portion of the frame assembly connects to a front wheel through one or more front suspension(s). The frame assembly extends rearward of the vehicle, where a rear wheel is connected to a swing arm structure at a rear side through one or more rear suspension(s). A front side of the swing arm structure is connected to a lower portion of the vehicle frame assembly. The swing arm structure acts as a support member for one or more rear suspensions and other vehicular parts which include the rear wheel and a shock absorber assembly. Further, an internal combustion engine is mounted to the vehicle frame assembly of the vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS
[0003] The present invention is described with reference to an embodiment of a two wheeled vehicle along with the accompanying figures. The same numbers are used throughout the drawings to reference like features and components.
[0004] Non-limiting and non-exhaustive embodiments of the invention are described with reference to the following figures, wherein like reference numerals refer to like parts throughout the various views unless otherwise specified. It should be appreciated that the following figures may not be drawn to scale.
[0005] Descriptions of certain details and implementations follow, including a description of the figures, which may depict some or all of the embodiments described below, as well as a discussion of other potential embodiments or implementations of the inventive concepts presented herein. An overview of embodiments of the invention is provided below, followed by a more detailed description with reference to the drawings.

[0006] Fig. 1 illustrates a left side view of a two wheeled vehicle, in accordance with an embodiment of the present subject matter.
[0007] Fig. 2 illustrates side view of rear portion of the two wheeled vehicle, in accordance with an embodiment of the present subject matter.
[0008] Fig. 3 illustrates perspective view of the rear portion of the two wheeled vehicle, in accordance with an embodiment of the present subject matter.
[0009] Fig. 4 illustrates perspective view of a swing arm assembly, in accordance with an embodiment of the present subject matter.
[00010] Fig. 5 illustrates an exploded view of the swing arm assembly, in accordance with an embodiment of the present subject matter.
[00011] Fig. 6 illustrates side view of the first arm member, in accordance with an embodiment of the present subject matter.
[00012] Fig. 7 illustrates side view for a section of the first arm member, in accordance with an embodiment of the present subject matter.
[00013] Fig. 8 illustrates side view of the first arm member, in accordance with an embodiment of the present subject matter.
[00014] Fig. 9 illustrates perspective view of the first arm member, in accordance with an embodiment of the present subject matter.
[00015] Fig. 10 and 11 illustrates graphical comparison of the stiffness between conventional swingarm and the present invention, in accordance with an embodiment of the present subject matter.

DETAILED DESCRIPTION
[00016] Generally, the frame assembly is made of tubular sections, channels or like, that are formed by hydroforming process or other processes that involve welding, rolling, steel extrusion or extrusion of other metal alloys. Similarly, the swing arm is also made by hydroforming process and through various other metal or alloy extrusion processes. The swing arm comprises of more than one arm members that supports various vehicular parts made of different materials.
[00017] Conventionally swing arms include a portion with load bearings parts for example mounting of rear shock absorbers that are prone to failure due to load acting on them. In conventional swing arms metal arm members are welded and joined which increase the stiffness of the swing arm so that it can bear the load but it also results in increasing the weight of the vehicle. Further, the strength and the stiffness in conventional swing arms is often compromised in order to meet design requirements of the vehicle which include shape and size of various parts such as rear wheel, frame assembly and shock absorber assembly. Any variation in design carried out in a portion of the swing arm to increase stiffness also warrants change of shape and size of swing arm and the corresponding parts connecting the changed portion of the swing arm. Any change in corresponding connecting parts of the swing arm particularly the frame assembly or the rear wheel also disturbs the structure and shape of the vehicle. Swing-arms are typically made of steel extrusions of geometrical shapes like circle, oval etc., which, owing to its nature of design, has restriction in changing the strength and stiffness in local areas of the swing-arm. As an alternative, cast swing-arms made of aluminum are also used which are light in weight and of complex three-dimensional geometries so that they can achieve desired local stiffness. However, such cast swing arm designs achieve desired stiffness and strength while they suffer from complexity of manufacturing, significant high cost rendering them unviable for all segments of transportation vehicles. Therefore, there exists a contradictory challenge of designing a versatile swing-arm which is simple, light weight, low cost like a sheet metal swing-arm while still being able to achieve desired stiffness and strength values like a cast swing-arm.
[00018] In conventional swing arm assembly, often a shock absorber assembly is connected to swing arm but the load from the shock absorber assembly is not adequately and proportionally transmitted to all portions of the swing arm. Rather the conventional swing arms lacks desired stiffness and its inability to properly receive and transmit load from the shock absorber assembly.
[00019] Additionally, in conventional fabricated tube type swing arm construction, it is not possible to increase the section locally wherever high stress is observed. Moreover, manufacturing of fabricated tube type swing arm with different cross sections by swaging is difficult due to ejection problems. Also, the manufacturing through two-formed sheet welding is not possible because it may cause weld breakage due to heat effected zone. Further, for a given weight, it is required to have more lateral and torsional stiffness especially at the portion receiving the vehicle load.
[00020] The present subject matter addresses the aforementioned problems and other problems of known art. Hence, it is an objective of the present subject matter is to provide an improved swing arm assembly for a two-wheeled vehicle which has higher stiffness and strength without changing shape and size of the connecting parts of the swing arm especially the frame assembly or the rear wheel. Additionally, the present invention aims to reduce the weight of the swing arm assembly to an optimal level.
[00021] To this end, the present invention discloses an improved swing arm assembly for a two wheeled vehicle comprising: a first arm member, a second arm member and a third arm member, said third arm member joining said first arm member and said second arm member from laterally opposite sides of the vehicle, said first arm member comprising a first front portion, a first intermediate portion and first rear portion, said second arm member comprising a second front portion, a second intermediate portion and a second rear portion wherein sad first intermediate portion and said second intermediate portion comprises plurality of hydroformingly formed depressions respectively.
[00022] According to above configuration, said first intermediate portion of said first arm member being vertically higher than said first front portion and said first rear portion. Further, it contributes to increase in stiffness of the said first arm member.
[00023] According to above configuration, said second intermediate portion having hydroformingly formed depressions being vertically higher than said second front portion and said second rear portion. The hydroformingly formed depressions improves the stiffness to weight ratio of the second arm member. More specifically, the load bearing capacity of the second intermediate portion is enhanced and the load is proportionally transferred to the other portions of the arm member. Moreover, it improves the load bearing capacity of the arm member and contributes to increase in stiffness of the said second arm member.
[00024] According to above configuration, said plurality of hydroformingly formed depressions are formed on outer side of said first arm member and said second arm respectively. The said plurality of hydroformingly formed depressions on outward side of said intermediate portion of said first arm member and said second arm member prevent variation on front and rearward ends of the swing arm assembly which leads to change in vehicle structure and change shape and size connected parts such as frame assembly and rear wheel.
[00025] According to above configuration, one or more hydroformingly formed depressions are being formed between said first intermediate portion and said first rear portion on the inward side of the first arm member. In comparison to conventional tube type swing arm the present invention reduces additional weight of the swing arm to reach at an optimum requirement as per the structure of the vehicle. Similarly, an additional weight is also reduced by one or more hydroformed depressions being provided between said second intermediate portion and said second rear portion on the inward side of the second arm member.
[00026] According to above configuration, height of said first intermediate portion being equal to or less than half of the length of the said first arm member to achieve optimum weight and stiffness requirements for the swing arm. Also, this ensures distance between the rear wheel and the swing arm is maintained adequately balancing the load received by shock absorbers on a mounting assembly on the third arm member. Additionally, the height of the first intermediate portion shall be sufficiently close to the mounting assembly on the third arm member.
[00027] According to above configuration, height of said second intermediate portion being equal to or less than half of the length of the said second arm member to achieve optimum weight and stiffness requirements for the swing arm. Also, this ensures distance between the rear wheel and the swing arm is maintained adequately balancing the load received by shock absorbers on a mounting assembly on the third arm member. Additionally, the height of the second intermediate portion shall be sufficiently close to the mounting assembly on the third arm member.
[00028] The present subject matter is further described with reference to accompanying figures. It should be noted that the description and figures merely illustrate the principles of the present subject matter. Various arrangements may be devised that, although not explicitly described or shown herein, encompass the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects, and examples of the present subject matter, as well as specific examples thereof, are intended to encompass equivalents thereof.
[00029] The foregoing disclosure is not intended to limit the present disclosure to the precise forms or particular fields of use disclosed. As such, it is contemplated that various alternate embodiments and/or modifications to the present disclosure, whether explicitly described or implied herein, are possible in light of the disclosure. Having thus described embodiments of the present disclosure, a person of ordinary skill in the art will recognize that changes may be made in form and detail without departing from the scope of the present disclosure. Thus, the present disclosure is limited only by the claims.
[00030] In the foregoing specification, the disclosure has been described with reference to specific embodiments. However, as one skilled in the art will appreciate, various embodiments disclosed herein can be modified or otherwise implemented in various other ways without departing from the spirit and scope of the disclosure. Accordingly, this description is to be considered as illustrative and is for the purpose of teaching those skilled in the art the manner of making and using various embodiments of the disclosure. It is to be understood that the forms of the disclosure herein shown and described are to be taken as representative embodiments. Equivalent elements, materials, processes or steps may be substituted for those representatively illustrated and described herein. Moreover, certain features of the disclosure may be utilized independently of the use of other features, all as would be apparent to one skilled in the art after having the benefit of this description of the disclosure. Expressions such as “including”, “comprising”, “incorporating”, “consisting of”, “have”, “is” used to describe and claim the present disclosure are intended to be construed in a non-exclusive manner, namely allowing for items, components or elements not explicitly described also to be present. Reference to the singular is also to be construed to relate to the plural.
[00031] Further, various embodiments disclosed herein are to be taken in the illustrative and explanatory sense, and should in no way be construed as limiting of the present disclosure. All joinder references (e.g., attached, affixed, coupled, connected, etc.) are only used to aid the reader's understanding of the present disclosure, and may not create limitations, particularly as to the position, orientation, or use of the systems and/or methods disclosed herein. Therefore, joinder references, if any, are to be construed broadly. Moreover, such joinder references do not necessarily infer that two elements are directly connected to each other.
[00032] Additionally, all numerical terms, such as, but not limited to, “first”, “second”, “third”, “primary”, “secondary”, “main” or any other ordinary and/or numerical terms, should also be taken only as identifiers, to assist the reader's understanding of the various elements, embodiments, variations and/or modifications of the present disclosure, and may not create any limitations, particularly as to the order, or preference, of any element, embodiment, variation and/or modification relative to, or over, another element, embodiment, variation and/or modification.
[00033] It will also be appreciated that one or more of the elements depicted in the drawings/figures can also be implemented in a more separated or integrated manner, or even removed or rendered as inoperable in certain cases, as is useful in accordance with a particular application. Additionally, any signal hatches in the drawings/figures should be considered only as exemplary, and not limiting, unless otherwise specifically specified.
[00034] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[00035] Fig. 1 illustrates a left side view of a multi wheeled vehicle 100, in accordance with an embodiment of the present subject matter. The two vehicle 100 includes a frame member 105 supporting a front wheel 110 and a rear wheel 115. The front wheel 110 and the rear wheel 115 are rotatably supported by front suspension system 120 and the rear suspension system 125, respectively. In one embodiment, the rear wheel 115 is additionally supported by a swingarm assembly (not shown). The front wheel 110 is provided with a front wheel brake 130 and the rear wheel 115 is provided with a rear wheel brake 136. In the present embodiment, the front wheel brake 130 is a disc brake. However, the front wheel brake 130 can be a drum brake or the disc brake, which is actuated using a hydraulic actuation.
[00036] In the present embodiment, a power unit 140 is mounted to a front portion of the frame member 105 and is disposed substantially below a fuel tank 145 and rearward of the front wheel 110. Further, a carburetor or a fuel injection system or the like (not shown) supplies air-fuel mixture to the power unit 140 including an internal combustion engine. Further, the front wheel 110 is pivotally supported by the frame member 105 and a handle bar assembly 150 is functionally connected to the front wheel 110 for maneuvering the vehicle 100. The handle bar assembly 150 supports an instrument cluster, vehicle controls including throttle, clutch, or electrical switches. Further, the handle bar assembly 150 supports at least one independent brake actuation lever 166. The vehicle 100 inlcudes another lever that is a brake pedal (not shown) disposed adjacent to a rider foot support structure 185.
[00037] Further, a seat assembly 180 is mounted to the frame member 105 and disposed rearward of the fuel tank 145. The rider can operate the vehicle 100 in a seated position on the seat assembly 180. Moreover, the vehicle 100 includes a pair of rider foot support structure 185 disposed on either side of the vehicle 100 for the user to rest feet. The foot support structure 185 secured to the frame member 105 of the vehicle 100.
[00038] Further, the vehicle 100 includes a front fender 195 covering at least a portion of the front wheel 110 and a rear fender 190 covering at least a portion of the rear wheel 115. Also, the vehicle 100 is provided with plurality of panels including front panel 170A and rear panel 170B mounted to the frame member 105 and covering the frame member 105 and/or parts of the vehicle 100. Also, the vehicle 100 is employed with plurality of mechanical, electronic, and electromechanical system including an anti-lock braking system, a vehicle safety system, or an electronic control system.
[00039] Fig. 2 illustrates side view of rear portion of said two wheeled vehicle (100), in accordance with an embodiment of the present subject matter. The two wheeled vehicle (100) as depicted in the illustrated embodiment includes a swing arm assembly (200) connecting a rear wheel (115) on rearward side (RW) of said two wheeled vehicle (100). The rear wheel (115) is also connected to the rear wheel brake (136). The swing arm assembly as per the present invention shown in Fig 3 includes a first arm member (201), a second arm member (202) and a third arm member (203) wherein the first arm member (201) and the second arm member (202) being disposed on laterally opposite sides of the two wheeled vehicle (100). Further, the third arm member (203) connects like a bridge between the first arm member (201) and the second arm member (202). Additionally, one side of the third arm member (203) connects an inward portion of the first arm member (201) and a second side of the third arm member (203) connects an inward portion of the seond arm member (202). Also, a mounting assembly (270) being connected to said third arm member (203).
[00040] As per the depicted embodiment, the first arm member (201) includes plurality of hydroformingly formed depressions (225) on an outward side of said first arm member. The depicted embodiment also shows more than one portions of swing arm (200) wherein a first front portion (210) of the first arm member (201) lies on the frontward side (FW) of first arm member (201). A first rear portion (230) of the first arm member (201) lies on the rearward side (RW) of said first arm member (201). Also, a first intermediate portion (220) of the first arm member (201) lies between the first front portion (210) of the first arm member (201) and the first rear portion (230) of the first arm member (201). Additionally, the first intermediate portion (220) of the first arm member (201 ) includes plurality of hydroformingly formed depressions (225) and the first intermediate portion (220) of the first arm member (201 ) having a higher cross sectional height H relative to said first front portion (210) and said first rear portion (230) respectively.
[00041] Fig. 3 illustrates side perspective view of the rear portion of the said two wheeled vehicle (100), in accordance with an embodiment of the present subject matter. As per the depicted embodiment first arm member (201) of the swing arm assembly (200) being connected to the frame asssembly (105) on frontward side (FW) through first front portion (210) and the first arm member (201) connected to the rear wheel (115) and rear wheel brake (136) on the rearward side (RW) through first rear portion (230). The depicted embodiment shows the outward side of the first arm member (201) wherein the first intermediate portion (220) of the first arm member (201 ) lies between the first front portion (210) of the first arm member (201) and the first rear portion (230) of the first arm member (201). The first intermediate portion (220) of the first arm member (200) includes plurality of depressions (225) and is having higher height H in comparison to the first front portion (210) of the first arm member (200) and the first rear portion (230) of the first arm member (200).
[00042] Fig. 4 illustrates perspective view of swing arm assembly (200), in accordance with an embodiment of the present subject matter. The swing arm assembly (200) includes the first arm member (201) and the second arm member (202) on laterally opposite sides wherein said first arm member (201) and said second arm member (202) being connected by the third arm member (203). As per the depicted embodiment, the first arm member (201) includes the first front portion (210) on the frontward side and the first rear portion (230) on the rearward side. Further the first intermediate portion (220) having the plurality of hydroformingly formed depressions (225) lies between the first front portion (210) and the first rear portion (230).
[00043] As per the depicted embodiment, a second front portion (240) lies on the frontward side of the second arm member (202) and a second rear portion (260) lies on the rearward side of the second arm member (202) wherein a second intermediate portion (250) lies between the second front portion (240) and second rear portion (260) wherein height of the second intermediate portion (250) is higher compared to the height of second front portion (240) and second rear portion (260) respectively. Further, the second intermediate portion (250) includes plurality of hydroformingly formed depressions (not shown). Additionally, the third arm member (203) includes a mounting assembly (270) connected on the middle of the third arm member (203).
[00044] Fig. 5 illustrates an exploded view of the swing arm assembly (200), in accordance with an embodiment of the present subject matter. The swing arm assembly (200) includes the first arm member (201) having the first front portion (210) on the frontward side and the first rear portion (230) on the rearward side. Further the first intermediate portion (220) having the plurality of hydroformingly formed depressions (225) lies between the first front portion (210) and the first rear portion (230). As per the depicted embodiment the plurality of hydroformingly formed depressions (225) are formed on the outward side of the first intermediate portion (220) of the first arm member (201).
[00045] Further, as per the depicted illustration, the swing arm assembly (200) includes the second arm member (202) having a second front portion (240) on the frontward side of the second arm member (202) and a second rear portion (260) on the rearward side of the second arm member (202) wherein a second intermediate portion (250) lies between the second front portion (240) and second rear portion (260) wherein height of the second intermediate portion (250) is higher to the height of second front portion (240) and second rear portion (260) respectively. The second intermediate portion (250) includes plurality of hydroformingly formed depressions (not shown). Additionally, the third arm member (203) includes a mounting assembly (270) connected on the middle of the third arm member (203). As per the depicted embodiment, the first arm member (201) being parallel to the second arm member (202). Further, first front portion (210) being of same height to that of second front portion (240) and the first front portion (210) being parallel to second front portion (240). The first intermediate portion (220) being of same height to that of second intermediate portion (250) and the first intermediate portion (220) being parallel to second intermediate portion (250). Additionally, the first rear portion (230) being of same height to that of second rear portion (260) and the first rear portion (230) being parallel to second rear portion (260).
[00046] Further, as per the depicted embodiment, the third arm member (203) includes third upper portion (203B) and third lower portion (203A) being connected to each other. Also. the mounting assembly (270) being connected to the third arm member (203) wherein the mounting assembly (270) includes one or more mounting members. As per the depicted embodiment, the mounting assembly (270) includes one or more mounts (270A) and one or more fastening members (270B, 270C).
[00047] Fig. 6 illustrates side view of the first arm member (201), in accordance with an embodiment of the present subject matter. As per the depicted embodiment, the first arm member (201) includes the first front portion (210) on the frontward side and the first rear portion (230) on the rearward side. Further the first intermediate portion (220) having the plurality of hydroformingly formed depressions (225) lies between the first front portion (210) and the first rear portion (230).
[00048] Fig. 7 illustrates side view for a section of the first arm member (201), in accordance with an embodiment of the present subject matter. As per the depicted embodiment, the plurality of hydroformingly formed depressions (225) formed on the outer side of the first intermediate portion (220) of the first arm member (201) extends to the lower end of the first arm member (201). Fig. 8 illustrates side view of the first arm member (201), in accordance with an embodiment of the present subject matter. As per the depicted embodiment, the first arm member (201) includes the first front portion (210) on the frontward side and the first rear portion (230) on the rearward side. Further the first intermediate portion (220) having the plurality of hydroformingly formed depressions (225) lies between the first front portion (210) and the first rear portion (230). The first intermediate portion (220) being vertically substantially close to the mounting assembly (270) when seen from a lateral side.
[00049] Fig. 9 illustrates perspective view of the first arm member (201), in accordance with an embodiment of the present subject matter. As per the depicted embodiment, the first arm member (201) includes the first rear portion (230) being vertically less in height to the first intermediate portion (220). As per the depicted embodiment, one or more hydroformingly formed depressions (226) are being formed between the first intermediate portion (220) and first rearward portion (230) on the inward side of the first arm member (201).
[00050] In a preferred embodiment, the swing arm assembly (200) for the two wheeled vehicle (100) include the first arm member (201), the second arm member (202) and the third arm member (203). The third arm member joins said first arm member (201) and said second arm member (202) from laterally opposite sides of said third arm member (203). The first arm member (201) comprising the first front portion (210), the first intermediate portion (220) and the first rear portion (230) wherein the first intermediate portion (220) includes plurality of hydroformingly formed depressions (225). The hydroformingly (225) formed depressions are achieved by die forming of the first swing arm member (210) wherein high pressure water is used to press at room temperature for working material into a die. These hydroforingly formed depressions achieves an adequate stiffness for the said first arm member (201) eliminating the need of using heavy materials. It also ensures the load recvieved by the first arm member (201) through a shock abosrber assembly (not show) mounted on a third arm member (203) through a mounting assembly (270) is transmitted proportionately and balanced.
[00051] Also, said second arm member (202) includes the second front portion (240), the second intermediate portion (250) and the second rear portion (260). The second intermediate portion (250) includes hydroformingly formed depressions (225) are also formed on second that ensures an adequate stiffness for the said first arm member (201) eliminating the need of using heavy materials. It also ensures the load recvieved by the first arm member (201) through a shock abosrber assembly (not show) mounted on a third arm member (203) through a mounting assembly (270) is transmitted and balanced.
[00052] Further, in the preferred embodiment, said first arm member (201) and said second arm member (202) are substantially parallel such that respective portions such as first front portion (210) is parallel to second front portion (240), first intermediate portion (220) is parallel to second intermediate portion (250) and first rear portion (230) is parallel to second rear portion (260).
[00053] Additionally, the vertical height of said first intermediate portion (220) being higher to said first front portion (210) and said first rear portion (230) which ensures the first intermediate portion (220) provides adequate stiffness to the said first arm member (201). Also, in another embodiment, said first intermediate member (220) being substantially close to said mounting assembly (270) which ensures the load received by the mounting assembly (270) is adequately balanced and proportionally transmitted to all parts the swing arm assembly (200).
[00054] Further, the vertical height of said second intermediate portion (250) being higher to said second front portion (240) and said second rear portion (260) which ensures the second intermediate portion (250) provides adequate stiffness to the said second arm member (202). Also, in another embodiment, said second intermediate member (250) being substantially close to said mounting assembly (270) which ensures the load received by the mounting assembly (270) is adequately balanced and proportionally transmitted to all parts the swing arm assembly (200).
[00055] Further in preferred embodiment, said plurality hydroformingly formed depressions (225) are formed on the outward sides of said first arm member (201) and said second arm member (202) respectively. This enables an ease in joint assembly between first arm member (201) and third arm member (203) on the inward side of first arm member (201). Further, to promote ease in joining between third arm member (203) and second arm member (202) said plurality hydroformingly formed depressions (225) are formed on the outward side of said second arm member (202).
[00056] In preferred embodiment, one or more depressions (226) is also being formed between said first intermediate portion (220) and said first rear portion (230) on the inward side of said first arm member (201). This is done to remove excessive mass and weight from the swing arm assembly.
[00057] Also, one or more depressions (226) are being formed between said second intermediate portion (250) and said second rear portion (260) on the inward side of said second arm member (202). This is done to remove excessive mass and weight from the swing arm assembly
[00058] Fig. 10 and 11 illustrates graphical comparison between stiffness of the conventional swingarm (A’, B’) without hydroforming portions at intermediate portions and the present invention (A, B), in accordance with an embodiment of the present subject matter. The graphical comparison between the conventional swingarm as per Figure 10 compares lateral stiffness (measured in Newtons per millimeter (N/mm)) wherein the horizontal axis represents deflection and the vertical axis represent load in N. As per the depicted graph the present invention (A) can bear more load than the conventional swingarm (A’). Further, figure 11 compares torsional stiffness (measured in Newtons meters per degree (Nm/deg)) wherein the horizontal axis represents deflection and the vertical axis represent torsional load in Nm. As per the depicted graph the present invention (B) can bear more torsional load than the conventional swingarm (B’). As per an embodiment of the present invention, the lateral stiffness for the present invention (A) is higher than lateral stiffness of the conventional swingarm (A’). Also, the torsional stiffness for the present invention (B) is higher than the torsional stiffness of the conventional swingarm (B’). As per another embodiment, the lateral stiffness for the present invention (A) being about fourteen percent higher than the conventional swingarm (A’) whereas, the torsional stiffness for the present invention (B) being about five percent higher than torsional stiffness of the conventional swingarm (B’).
[00059] Many modifications and variations of the present subject matter are possible in the light of above disclosure. Therefore, within the scope of claims of the present subject matter, the present disclosure may be practiced other than as specifically described.

LIST OF REFERENCE NUMERALS

100: Vehicle
105: Frame assembly
110: Front wheel
115: Rear wheel
120: Front suspension system
125: rear suspension system
130: Front wheel brake
136: Rear wheel brake
140: Power unit
145: Fuel tank
150: Handle bar assembly
166: Actuation lever
170: Front panel
170B: Rear panel
180: Seat assembly
185: Rider foot support structure
190: Rear fender
195: Front fender
200: Swing arm assembly
201: First arm member
202: Second arm member
203: Third arm member
203A: Third upper portion
203B: Third lower portion
210: First front portion
220: First intermediate portion
225: Plurality of hydroformingly formed depressions
226: One or more hydroformingly formed depressions
230: First rear portion
240: Second front portion
250: Second intermediate portion
260: Second rear portion
270: Mounting assembly
270A: One or more mounts
270B, 270C: One or more fastening members

,CLAIMS:I/We Claim

1. A swing arm assembly (200) for a two wheeled vehicle (100) comprising:

a first arm member (201),
a second arm member (202);
a third arm member (203);
said first arm member (201) and said second arm member (202) being connected to said third arm member (203) from laterally opposite sides of said vehicle (100),
said first arm member comprising: a first front portion (210), a first intermediate portion (220), a first rear portion (230), and
said second arm member comprising: a second front portion (240), a second intermediate portion (250), and a second rear portion (260);
wherein said first intermediate portion (220) and said second intermediate portion (250) being configured with a plurality of formed depressions (225), said depressions (225) being formed by hydroforming process.
2. The swing arm assembly (200) for said two wheeled vehicle (100) as claimed in claim 1, wherein said first intermediate portion (220) of said first arm member (201) being vertically higher in dimension than said first front portion (210) and said first rear portion (230) .
3. The swing arm assembly (200) for said two wheeled vehicle (100) as claimed in claim 1, wherein said second intermediate portion (250) of said second arm member (202) being vertically higher in dimension than said second front portion (240) and said second rear portion (260).
4. The swing arm assembly (200) for said two wheeled vehicle (100) as claimed in claim 1, wherein said first arm member (201) being parallel to said second arm member (202).
5. The swing arm assembly (200) for said two wheeled vehicle (100) claimed in claim 1, wherein said plurality of hydroformingly formed depressions (225) on said first intermediate portion (220) of said first arm member (201) being disposed on an outward side of said first arm member (201).
6. The swing arm assembly (200) for said two wheeled vehicle (100) as claimed in claim 1, wherein said hydroformingly formed depressions (225) on said second intermediate portion (250) of said second arm member (202) being on an outward side of said second arm member (202).
7. The swing arm assembly (200) for said two wheeled vehicle (100) as claimed in claim 1 or claim 2 or claim 3, wherein said first intermediate portion (220) being parallel to said second intermediate portion (250).
8. The swing arm assembly (200) for said two wheeled vehicle (100) as claimed in claim 1 or claim 2, wherein one or more depressions (225) being formed between said first intermediate portion (220) and said first rear portion (230) on an inward side of said first arm member (201).
9. The swing arm assembly (200) for said two wheeled vehicle (100) as claimed in claim 1 or claim 2, wherein one or more depressions (225) are being formed between said second intermediate portion (250) and said second rear portion (260) on an inward side of said second arm member (202).
10. The swing arm assembly (200) for said two wheeled vehicle (100) as claimed in claim 1, wherein a mounting (270) being mounted on said third arm member (203).
11. The swing arm assembly (200) for said two wheeled vehicle (100) as claimed in claim 1 or claim 10, wherein height of said first intermediate portion (220) being substantially equal to said mounting assembly (270) when seen from a lateral side.
12. The swing arm assembly (200) for said two wheeled vehicle (100) as claimed in claim 1 or claim 10, wherein height of said second intermediate portion (250) being substantially equal to said mounting assembly (270) when seen from a lateral side.
13. The swing arm assembly (200) for said two wheeled vehicle (100) as claimed in claim 1 or claim 2, wherein height of said first intermediate portion (220) of said first arm member (201) being equal to or less than half the length of said first arm member (201).
14. The swing arm assembly (200) for said two wheeled vehicle (100) as claimed in claim 1 or claim 2, wherein height of said second intermediate portion (250) of said second arm member (202) being equal to or less than half the length of said second arm member (202).