Claims:We Claim:
1. A pillion rider support structure (202) for a vehicle (100) comprising
a pair of left and right holding portions(204);
a backrest portion (205); and
a base portion (303),
wherein said backrest portion (205) extends from said pair of left and right holding portions (204) forming an arch when viewed from a rear side of said vehicle (100), and
wherein said base portion (303) connects said pair of left and right holding portions (204) extending in a longitudinal direction (L-L’) of the vehicle (100).

2. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 1, wherein said base portion (303) includes
a front stepped portion (303A), and
a central stepped portion (303B),
wherein said front stepped portion (303A) being ahead of the central stepped portion (303B) in the longitudinal direction (L-L’) of said vehicle (100).

3. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 2, wherein said front stepped portion (303A) includes
one or more rear mounting openings (303AA) coaxial to first set of one or more openings (301BB) in a rear cross bracket (301B) being configured to receive one or more attachment means (203) to connect said base portion (303) to said rear cross bracket (301B).

4. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 1, wherein a front-end portion of at least one of said pair of left and right holding portions (204) being configured to have mounting lugs (204A).

5. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 4, wherein said mounting lugs (204A) being configured to have one or more front mounting openings (204AA) coaxial to a second set of one or more opening (301AA) provided in a front cross bracket (301A) to receive one or more attachment means (203) to connect said holding portions (204) to said front cross bracket (301A).

6. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 5, wherein said one or more front mounting openings (204AA) and the second set of one or more openings (301AA) being provided in a lateral direction (C-C’) of said vehicle (100).

7. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 5, wherein said front cross bracket (301A) and rear cross bracket (301B) being attached to said pair of left and right seat rails (103).

8. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 1, wherein said central stepped portion (303B) includes one or more mounting holes (303BA) to attach a seat lock device (302) disposed between said storage box (201) and pillion rider support structure (202).

9. The pillion rider support structure (202)for a vehicle (100) as claimed in claim 2, wherein said central stepped portion (303B) includes an opening (303BB) adapted to receive a seat lock pin.

10. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 1, wherein base portion (303) includes an uprising curved surface (303BE) extending from the top peripheral surface of said central stepped portion (303B) to connect with a portion of an inner surface (204B) of at least one of said holding portions (204).

11. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 1, wherein base portion (303) includes one or more protrusion (303BC) of predetermined cross-section extending from said uprising curved surface (303BE) in said lateral direction (C-C’) of said vehicle (100).

12. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 11, wherein said protrusion (303BC) includes a threaded hole (303BCA) being configured to receive attachment means to connect said storage box (201) to said pillion rider support structure (202).

13. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 11, wherein said protrusion (303BC) being configured to have a semi arc-shaped cross-section.

14. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 10, wherein said uprising curved surface (303BE) includes one or more storage box resting portion (303BD).

15. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 10, wherein said uprising curved surface (303BE) includes one or more primary openings (303BF) being configured to receive one or more cables.

16. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 1, wherein said base portion (303) includes a rear wall (303C), said rear wall (303C) includes one or more openings (303CA) in the longitudinal direction (L-L’) of said vehicle (100) being configured to attach a tail lamp unit (105) to said pillion rider support structure (202) using attachment means (701).

17. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 1, wherein said base portion (303) includes one or more secondary openings (303BG) being configured to receive one or more wires.

18. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 17, wherein said secondary openings (303BG) being configured to have trapezoidal cross section.

19. The pillion rider support structure (202) for a vehicle (100) as claimed in claim 10, wherein said inner surface (204B) of said holding portions (204) being configured to have stepped portion adapted to surround said storage box (201).

20. A saddle-type vehicle (100) comprising
a seat assembly (104) extends in a longitudinal axis (L-L’) of the vehicle (100); said
a frame assembly (101);
a storage box (201); and
a pillion rider support structure (202) as claimed in any of the preceding claims;
wherein said seat assembly (104) includes
a rider's seat (104A), and
a pillion seat (104B), wherein said pillion seat (104B) being separate from and disposed posterior to said rider’s seat (104A),
wherein said pillion seat (104B) being removably secured to said frame assembly (101),
wherein said storage box (201) being disposed of substantially below said pillion seat (104B),
wherein said storage box (201) being accessible in an open condition of said pillion seat (104B),
wherein said pillion rider support structure (202) substantially surrounds said storage box (201), and
wherein said pillion seat (104B) being opened through a seat lock device (302).

21. The saddle type vehicle (100) as claimed in claim 20, wherein said pillion rider support structure (202) being configured to have U – shaped cross-section when viewed from the top of said vehicle (100).

22. The saddle type vehicle (100) as claimed in claim 20, wherein said pillion support structure includes a backrest portion (205) with one or more bends being configured to form inverted U-shaped cross-section when viewed from a rear side (R) of said vehicle (100).

23. The saddle type vehicle as claimed in claim 20, wherein said storage box (201) being positioned adjacent to said tail lamp unit (105), wherein said storage box (201) being located substantially above said rear wheel (108) of said vehicle (100).
, Description:TECHNICAL FIELD
[0001] The present subject matter relates to a vehicle. More particularly, to a saddle-type vehicle.

BACKGROUND
[0002] Typically, a frame assembly includes a mainframe member extending rearward and obliquely downward from a head pipe. A front wheel is mounted to the head pipe via a front fork. A rear wheel is mounted to the pivot frame via a swing arm. The mainframe member, which receives a force applied by the front and rear wheels, is required to have a high bending stiffness and an optimal twisting stiffness. A pair of left and right seat rails extend rearwardly and upwardly from the said mainframe member. A seat assembly is mounted on the said pair of left and right seat rails. The seat assembly includes a rider’s seat and a pillion seat. The pillion seat is disposed of posterior to said rider’s seat. A pillion handle is provided adjacent to the pillion seat. The pillion handle is held by a pillion rider and typically provided at the rear of the pillion seat.
[0003] The above information disclosed in this Background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

BRIEF DESCRIPTION OF THE DRAWINGS
[0004] The present invention is described with reference to an exemplary embodiment of frame assembly for a saddle-type multi-wheeled vehicle. This invention is implementable in two-wheeled vehicles/three-wheeled vehicles. The same numbers are used throughout the drawings to reference like features and components. Further, the inventive features of the invention are set forth in the appended claims.
[0005] 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.
[0006] 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.
[0007] Figure 1 illustrates a side view of a vehicle (100), where few parts are omitted from the figure as per embodiment, in accordance with one example of the present subject matter.
[0008] Figure 2 illustrates a top-side perspective view of rear portion of the vehicle (100), where few parts are omitted from the figure, as per embodiment, in accordance with one example of the present subject matter.
[0009] Figure 3a illustrates an exploded perspective view of rear portion of a vehicle (100), where few parts are omitted from the figure as per embodiment, in accordance with one example of the present subject matter.
[00010] Figure 3b illustrates a perspective view of the pillion rider support structure (202), in accordance with one example of the present subject matter.
[00011] Figure 4 illustrates a side cut section view of the vehicle across the A-A’ and B-B’ axis, where few parts are omitted from the figure as per embodiment, in accordance with one example of the present subject matter.
[00012] Figure 5 illustrates a front side cut section view of the vehicle (100) and a front side perspective cut section view of the vehicle (100) across the C-C’ where few parts are omitted from the figure as per embodiment, in accordance with one example of the present subject matter.
[00013] Figure 6aillustrates a top side view of the vehicle (100) and a cut section view across the D-D’ axis of the vehicle (100) where few parts are omitted from the figure as per embodiment, in accordance with one example of the present subject matter.
[00014] Figure 6b illustrates a cut section view across the E-E’ axis of the vehicle, as per embodiment, in accordance with one example of the present subject matter.
DETAILED DESCRIPTION
[00015] In the following description, numerous details are set forth to provide a thorough understanding of the embodiments. One skilled in the relevant art will recognize, however, that the techniques described herein can be practiced without one or more of the specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring certain aspects.
[00016] A frame assembly forms the skeleton of a saddle-type vehicle. The frame assembly includes a head pipe and a mainframe member. The mainframe member is extending downwards and rearwards from said head pipe. A pair of left and right seat rails are attached to the mainframe member. The pair of left and right seat rails extend rearwardly and inclined upwardly from a portion of the said mainframe member. A seat assembly is supported on the pair of left and right seat rails. The tandem-seat assembly includes a rider seat and a pillion seat disposed of there behind. Further, a seat assembly includes a seat lock device. The seat lock device is capable of locking the closed state of the seat. The seat is openable and closed using a seat lock device. In the conventional structure, the seat lock device being attached to a pillion handle using a dedicated bracket. Furthermore, a tail lamp unit is attached to the frame assembly using a dedicated mounting bracket. Moreover, in saddle-type vehicles, the pillion seat, and a storage box are independently mounted on the pair of left and right seat rails, thereby requiring a plurality of mounting brackets and fasteners. Additionally, mounting of pillion seat and storage box, pillion handle, tail lamp separately on the pair of left and right seat rails is a time-consuming and tedious task. Further, an increased number of brackets and fasteners increases the manufacturing cost. In order to address above issue, it is known in the prior art to mount the storage box on a tail cover bracket. However, this involves change in the design of tail cover bracket by providing an extension. This makes the design of tail cover bracket complex which poses a challenge for manufacturing feasibility that requires complex manufacturing control.
[00017] In addition to above, typically, various alignments of parts within the vehicle during the assembly process may be required, and misalignment due to component fault may result in catastrophic failure later. More specifically, the misalignment occurs due to the parts of dimensions outside the tolerance of the order of few millimeters. This occurs due to variation in manufacture and material. The few millimeters tolerances can be compensated by the sealing means to reduce the NVH (Noise, vibration, and harshness) issues. However, excessive tolerances can no longer be compensated by the sealing means especially, in the rear portion of the frame assembly. This problem arises due to the usual method of reinforcing the frame and use of a plurality of brackets welded to mount storage box, tail light, pillion handle of the different coefficient of expansion. Further, any over-dimensioned or under dimensioned part poses a challenge to assemble in the assembly line during mass production especially while being assembled by hand. Furthermore, the uneven gap when one or more parts are deleteriously outside of a range of tolerance results in poor fit and finish. It is observed that due to poor fit and finish pluriaty of wires from the tail lamp unit running through bottom side of pillion handle is externally visible. Therefore, in order to conceal the wires a dedicated cover is mounted on the underside of the pillion handle.
[00018] In addition to the above, it is observed that the fingers, and particularly fingertips, of the pillion rider, encounter injury during ridings, e.g. fingers get crushed when trapped between pillion seat and pillion handle. To this end, it is desirable to protect pillion rider fingers from being trapped in the gap between the pillion seat and pillion handle. Therefore, attempts have been made to address the said issue by locating the pillion handle away from the pillion seat. More specifically, the pillion handles are separated from the pillion seat and disposed on the rear side of the vehicle away from the pillion seat.
[00019] In the known prior arts, the pillion handle being configured to have pillion handle bracket. The pillion handle bracket is mounted on the seat lock bracket using plurality of fasteners. The seat lock bracket is further welded on the frame assembly. Therefore, conventional arrangement requires plurality of mounted structures and fasteners.
[00020] However, during sudden acceleration or braking, pillion rider tends to slip from the seat causing panic. The panic is more when pillion seat is comparatily at a higher level then the rider seat and the seating area of the pillion seat is comparatively narrower than the rider seat. Therefore, to reduce the panic, the pillion rider shall either hold the pillion handle firmly throughout travel time or immediately grab the pillion handle when such events happen. However, the pillion rider needs to extend the hands towards the backside to reach the pillion handle to grab it tightly. This causes discomfort to the pillion rider when extending a hand towards the rear and holding the pillion handle for a long time. Therefore, it is observed that rarely do pillion riders grabs the pillion handle to get the desired grip which leads to severe accidents which typically occur during sudden acceleration or braking. Additionally, when the rider needs to take the vehicle off from the center stand, it is difficult to extend a hand to access the pillion handle. This causes inconvenience to the rider.
[00021] Accordingly, there is a need for an improved pillion handle that supports the pillion rider and comes within ergonomical reach of the pillion rider, inexpensive to manufacture, and is configured to support a plurality of components. The object of the present invention has been made in consideration of the above-mentioned circumstances and reduced number of brackets and fasteners to mount a storage box, a pillion seat, a pillion handle, and a tail lamp unit.
[00022] According to one aspect of the present subject matter, a pillion rider support structure for a vehicle is disclosed which comprised of left and right holding portions; and a backrest portion. The backrest portion extends from said pair of left and right holding portions and form an arch when viewed from a rear side of said vehicle. The base portion connects said pair of left and right holding portions extending in a longitudinal direction of the vehicle. The base portion includes a front stepped portion , and a central stepped portion. The front stepped portion being ahead of the central stepped portion in the longitudinal direction of said vehicle.
[00023] As per another aspect of the present invention, a saddle-type vehicle comprising a seat assembly extends in the longitudinal axis of the vehicle; a frame assembly; a storage box; and a pillion rider support structure. The seat assembly includes a rider's seat, and a pillion seat. The pillion seat being separate from and disposed of posterior to said rider’s seat. The pillion seat being removably secured to said frame assembly. The storage box being disposed of substantially below said pillion seat. The storage box being accessible in an open condition of said pillion seat. The pillion rider support structure substantially surrounds said storage box. The pillion seat being opened through a seat lock device.
[00024] According to this configuration, one of the advantages of the present invention being the pillion support structure substantially covering the pillion seat thereby providing a reassuring grip to the pillion rider by being disposed within the ergonomic reach of the pillion rider. This improves the riding comfort especially during long distances ensuring the pillion rider is seated safely and comfortably.
[00025] As per another embodiment of the present invention, said front stepped portion includes one or more rear mounting openings coaxial to first set of one or more openings in a rear cross bracket being configured to receive one or more attachment means to connect said base portion to said rear cross bracket.
[00026] As per yet another embodiment of the present invention, wherein a front-end portion of at least one of said pair of left and right holding portions being configured to have mounting lugs.
[00027] As per further embodiment of the present invention, said mounting lugs being configured to have one or more front mounting openings coaxial to a second set of one or more opening provided in a front cross bracket to receive one or more attachment means to connect said holding portions to said front cross bracket.
[00028] As per another embodiment of the present invention, said one or more front mounting openings and the second set of one or more openings being provided in a lateral direction of said vehicle.
[00029] As per yet another embodiment of the present invention, said front cross bracket and rear cross bracket being attached to said pair of left and right seat rails.
[00030] As per an embodiment of the present invention, said central stepped portion includes one or more mounting holes to attach the seat lock device disposed between said storage box and pillion rider support structure .
[00031] As per another embodiment of the present invention, said central stepped portion includes an opening adapted to receive a seat lock pin.
[00032] According to this configuration, one of the advantages of the present invention being that the pillion support structure includes a plurality of attachment points. The attachment points are configured to receive two or more devices including tail lamp unit, storage box, seat lock device thereby eliminating the plurality of mounting structure required to mount two or more devices. This reduces the overall weight of the frame assembly.
[00033] As per yet another embodiment of the present invention, base portion includes an uprising curved surface extending from the top peripheral surface of said central stepped portion to connect with a portion of an inner surface of at least one of said holding portions.
[00034] As per an embodiment of the present invention, base portion includes one or more protrusion of predetermined cross-section extending from said uprising curved surface in said lateral direction of said vehicle.
[00035] As per another embodiment of the present invention, wherein said protrusion includes a threaded hole being configured to receive attachment means to connect said storage box to said pillion rider support structure.
[00036] According to this configuration, one of the advantages of the present invention involves the storage box being reliably attached to the pillion support structure. This eliminates any dedicated support bracket required to mount the storage box to the frame assembly thereby reduces the overall weight of the frame assembly.
[00037] As per yet another embodiment of the present invention, said protrusion being configured to have a semi arc-shaped cross-section.
[00038] As per an embodiment of the present invention, said uprising curved surface includes one or more storage box resting portion.
[00039] According to this configuration, one of the advantages of the present invention the storage box is reliably supported on the pillion support structure. This eliminates the rattling noise from the storage box.
[00040] As per another embodiment of the present invention, said uprising curved surface includes one or more primary openings being configured to receive one or more cables.
[00041] As per yet another embodiment of the present invention, said base portion includes a rear wall, said rear wall includes one or more openings in the longitudinal direction of said vehicle being configured to attach a tail lamp unit to said pillion rider support structure using attachment means.
[00042] As per further embodiment of the present invention, said base portion includes one or more secondary openings being configured to receive one or more wires.
[00043] As per another embodiment of the present invention, said secondary openings being configured to have a trapezoidal cross-section.
[00044] As per yet another embodiment of the present invention, said inner surface of said holding portions being configured to have a stepped portion adapted to surround said storage box.
[00045] According to this configuration, one of the advantages of the present invention is that the stepped portion of the inner surface of the pillion support structure restricts the downward movement of a sidewall of the storage box when the pillion rider sits on the pillion seat. This prevents protect pillion rider fingers to be trapped in the gap between the pillion seat and pillion support structure.
[00046] As per further embodiment of the present invention, said pillion rider support structure being configured to have U – shaped cross-section when viewed from the top of said vehicle.
[00047] As per another embodiment of the present invention, said backrest portion with one or more bends being configured to form inverted U-shaped cross-section when viewed from a rear side of said vehicle.
[00048] As per yet another embodiment of the present invention, said storage box being positioned adjacent to said tail lamp unit, wherein said storage box being located substantially above said the rear wheel of said vehicle.
[00049] 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.
[00050] 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.
[00051] 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.
[00052] 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.
[00053] 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.
[00054] 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.
[00055] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[00056] Figure 1 illustrates a side view of a vehicle (100), where few parts are omitted from the figure as per embodiment, in accordance with one example of the present subject matter. The invention will be described by taking a saddle-type vehicle as an example through the specification. As indicated in Figure 1, this saddle-type vehicle (100) (hereinafter “vehicle”) has, for example, the frame assembly (101) to support different parts of said vehicle (100). The frame assembly (101) includes a mainframe member (102), and a pair of left and right seat rails (103). As per the illustrated embodiment, the mainframe member (102) extends rearwardly from the head pipe (not shown) along a longitudinal direction (L-L’) of the vehicle (100). Furthermore, the pair of left and right seat rails (103) are extending rearwardly from a portion of the mainframe member (102). As per the preferred embodiment, the pair of left and right seat rails (103) are welded to the mainframe member (102). A seat assembly (104) is supported on the frame assembly (101). The seat assembly (104) includes a rider seat (104A) and a pillion seat (104B). The pillion seat (104B) being separate from and disposed of posterior to said rider’s seat (104A). For the safety of the rider and in conformance with the traffic rules, a taillamp unit (105) and a turn signal lamp unit (106) are provided in the rear portion of the vehicle (100). Further, a rear suspension assembly (107) is operatively connected to the frame assembly (101). As per the preferred embodiment, the rear suspension assembly (107) is of direct mount mono-shock configuration. More specifically, one end of the rear suspension is supported by a rear shock absorber mounting bracket. A Vehicle identification number (hereinafter “VIN”) is engared on a top surface of the rear shock absorber mounting bracket in such a way that when seen from side, the VIN appears to be disposed in between a seat latch (not shown) and seat hook (not shown). Further, a hydraulic and electronic control unit for antilock braking system (HECU-ABS) (not shown) is mounted on the left side of the vehicle (100) behind the main frame member (102) and below the seat rails (103) at inclined position. As per preferred embodiment, an electronic control unit (hereinafter “ECU”) (not shown) is mounted on the left side of the vehicle adjacent to integrated starter generator (ISG) (not shown) and arranged in proximity to electronic fuel injection assembly (hereinafter “EFI assembly”). This reduces the wire length required to connect ECU to the EFI assembly. Further, a rear wheel (108) rotatably supported at a rear end of a swing arm (109). A rear fender (110) for covering an upper side of the rear wheel (108) is mounted to a rear portion of the frame assembly (101) to prevent mud and water splashed by the rotating rear wheel (108) from entering the critical parts disposed of close by. As per preferred embodiment, an engine (not shown) is mounted to the frame assembly (101). An ISG controller (not shown) is mounted on a top of cylinder head (not shown) of the engine (not shown) and below a fuel tank (not shown).
[00057] Figure 2 illustrates a top-side perspective view of rear portion of the vehicle (100), where few parts are omitted from the figure, as per embodiment, in accordance with one example of the present subject matter. A pillion rider support structure (202) (as highlighted in the figure) is attached to the frame assembly (101) and substantially surrounds a storage box (201) to protect against external impact. The storage box (201) being accessible in an open condition of said pillion seat (104B) (as shown in figure 1). The storage box (201) being positioned adjacent to a tail lamp unit (105), and is located substantially above the rear wheel (108) (as shown in figure 1) of said vehicle (100). The pillion rider support structure(202) is attached to the frame assembly using one or more attachment means (203). The one or more attachment means (203) are selected from a group consisting of screws, nuts, and bolts. The pillion rider support structure (202) includes a pair of left and right holding portions204), a backrest portion (205). The backrest portion (205) extends from said pair of left and right holding portions (204) form an arch when viewed from a rear side of the vehicle (100).
[00058] Figure 3a illustrates an exploded perspective view of rear portion of the vehicle (100), where few parts are omitted from the figure as per embodiment, in accordance with one example of the present subject matter. Figure 3b illustrates a perspective view of the pillion rider support structure (202), in accordance with one example of the present subject matter. For sake of brevity, Figure 3a and Figure 3b will be discussed together. The pillion rider support structure (202) is supported on a pair of left and right seat rails (103) through one or more cross brackets (301). The cross brackets (301) being configured to connect said pair of left and right seat rails (103). The cross brackets (301) include a front cross bracket (301A) and a rear cross bracket (301B). The front cross bracket (301A) includes a second set of one or more openings (301AA). The rear cross bracket (301B) includes a first set of one or more openings (301BB). The pillion rider support structure (202) includes a base portion(303) being configured to connect said pair of left and right holding portions(204). The base portion (303) includes a front stepped portion (303A), and a central stepped portion (303B). The front stepped portion (303A) being ahead of the central stepped portion (303B) in the longitudinal direction (L-L’) of the vehicle (100). The front stepped portion (303A) includes one or more rear mounting openings (303AA).The rear mounting holes (303AA) being coaxial to the first set of openings (301BB) in the rear cross bracket (301B). The rear mounting openings (303AA) and first set of openings (301BB) being configured to receive one or more attachment means (203) to connect the base portion (303) to the rear cross bracket (301B). Further, a front-end portion of at least one of said left and right holding portions(204) being configured to have mounting lugs (204A). As per illustrated embodiment, the left and right holding portions(204) being configured to have mounting lugs (204A). The mounting lugs (204A) being configured to have one or more front mounting openings (204AA) coaxial to the second set of one or more opening (301AA) provided in the front cross bracket (301A) to receive one or more attachment means (203) to connect the holding portions (204) to the front cross bracket (301A). The one or more front mounting openings (204AA) and the second set of one or more openings (301AA) being provided with mounting axis being in a lateral direction (C-C’) of the vehicle (100). The central stepped portion (303B) includes one or more mounting holes (303BA) to attach the seat lock device (302) to the central stepped portion (303B). The seat lock device (302) is disposed of between said storage box (201) and the pillion rider support structure (202). The central stepped portion (303B) includes an opening (303BB) adapted to receive a seat lock pin (not shown). Further, the base portion (303) includes an uprising curved surface extending from the top peripheral surface of the central stepped portion (303B) to connect with a portion of at least one of the inner surfaces of holding portions (204). The base portion (303) includes one or more protrusion (303BC) of semi arc-shaped cross-section extending from the curved surface in the lateral direction (C-C’) of the vehicle (100). The protrusion (303BC) includes a threaded hole (303BCA). The threaded hole (BCA) being configured to receive attachment means (not shown) to connect the storage box (201) to the pillion rider support structure (202). The uprising curved surface (303BE) includes one or more storage box resting portion (303BD) being configured to have a cylindrical-shaped cross-section. The curved surface includes one or more primary openings (303BF) and one or more secondary openings (303BG). The primary openings (303BF) being configured to receive one or more cables (not shown). More specifically, the cables (not shown) includes seat lock cables. The secondary openings (303BG) of a trapezoidal cross-section. The secondary openings (303BG) being configured to receive one or more wires (not shown). More specifically, the wires (not shown) includes tail lamp wires. The base portion (303) includes a rear wall (303C) provided at the rear end portion. The rear wall (303C) includes one or more openings (303CA) in the longitudinal direction (L-L’) of the vehicle (100).
[00059] Figure 4 illustrates a side cut section view of the vehicle (100) across the A-A and B-B’ axis, where few parts are omitted from the figure as per embodiment, in accordance with one example of the present subject matter. The backrest portion (205) of the pillion rider support structure (202) being extending rearwardly and upwardly from the holding portions(204) of the pillion rider support structure (202) in the longitudinal direction (L-L’) of the vehicle (100) when viewed from the side of said vehicle (100). The mounting lugs (204A) being attached to the front cross bracket (301A) welded to pair of left and right seat rails (103) through the attachment means (203) in a lateral direction (C-C’) of the vehicle (100). Further, the base portion (303) being attached to rear cross bracket (301B) welded to the pair of the seat rails (103) through attachment means (203) in the up-down direction of the vehicle (100). As per illustrated embodiment, the attachment means (203) are four in number.
[00060] Figure 5 illustrates a front side cut section view of the vehicle (100) across C-C’ where few parts are omitted from the figure as per embodiment, and a front side perspective cut section view of the vehicle (100), in accordance with one example of the present subject matter. The inner surface (204B) of pair of left and right holding portions(204) being configured to have a stepped portion (as highlighted in the figure) adapted to surround a portion of said storage box (201).
[00061] Figure 6a illustrates a top side view of the vehicle and a cut section view across the D-D’ axis of the vehicle where few parts are omitted from the figure as per embodiment, in accordance with one example of the present subject matter. Figure 6b illustrates a cut section view across the E-E’ axis of the vehicle, as per embodiment, in accordance with one example of the present subject matter. For sake of brevity, Figure 6a and Figure 6b will be discussed together. The pillion rider support structure (202) being configured to have a substantially U-shaped structure when viewed from the top of said vehicle (100). As per illustrated embodiment, the rear wall (303C) adapted to have one opening (303CA) being configured to receive an attachment means (701) to attach the tail lamp unit (105) with said pillion rider support structure (202).
[00062] The above-described embodiments, and particularly any “preferred” embodiments, are possible examples of implementations and merely set forth for a clear understanding of the principles of the invention. It will be apparent to those skilled in the art that changes in form, connection, and detail may be made therein without departing from the spirit and scope of the invention.

List of Reference
100 Vehicle
101 Frame assembly
102 Mainframe member
103 Left and right seat rails
104 Seat assembly
105 Tail lamp unit
106 Turn signal lamp unit
107 Rear suspension assembly
108 Rear wheel
109 Swing arm
110 Rear fender
201 Storage box
202 Pillion rider support structure
203 Attachment means
204 Left and right holding portions
204A Mounting lugs
204AA One or more front mounting openings
204B Inner surface
205 Back rest
301 one or more cross bracket
301A Front cross bracket
301AA Second set of openings
301B Rear cross bracket
301BB First set of openings
302 Seat lock device
303 Base portion
303A Front stepped portion
303AA Rear mounting holes
303B Central stepped portion
303BA One or mounting holes
303BB Opening being configured to receive seat lock pin
303BC One or more protrusion
303BCA Threaded hole in protrusion
303BD Storage box resting portion
303BE Uprising curved surface
303BF Primary openings
303BG Secondary openings
303C Rear wall
303CA One or more opening in rear wall
701 Attachment means