Claims:We claim:
1. A frame assembly (101) for a two-wheeled vehicle (100) comprising:
a front portion (102 (a)) and a rear portion (102 (b)), wherein the front portion (102 (a)) and the rear portion (102 (b)) are detachably attached.
2. The frame assembly (101) as claimed in claim 1, wherein a rear end of the front portion (102 (a)) includes at least one rear attachment means (148), and a front end of the rear portion (102 (b)) includes at least one front attachment means (148 (a)), the at least one rear attachment means (148) and the front attachment means (148 (a)) being detachably attached to form the frame assembly (101) wherein the detachable region is substantially below the rider seat assembly (111) and rearward of the power train unit (108, 110) of the vehicle (100).
3. The frame assembly (101) as claimed in claim 1, wherein the rear portion (102 (b)) supports one or more of a seat assembly (111), a utility unit (not shown), a pillion seat of the two wheeled vehicle (100).
4. The frame assembly (101) as claimed in claim 1, wherein said front portion (102 (a)) includes a front upper structure (119) and a front lower structure (120), the front upper structure (119) being configured to accommodate one or more electrical power storage units (108), and wherein said front lower structure (120) is configured to accommodate an electrical traction unit (110).
5. A frame assembly (101) comprising a front portion (102 (a)) and a rear portion (102 (b)), the front portion (102 (a)) includes an upper portion and a lower portion,
the upper portion includes;
a head tube (122);
a front support member (123) extending inclinedly downwards from said head tube (122);
a horizontal structure (124) extending rearwards from a bottom portion of said front support member (123);
a top structure (129), including a first top member (130) and a second top member (131), extending inclinedly rearwards from the head tube (122); thereby forming a caged structure to secure a power storage unit; and
the lower portion includes:
a pair of arc members (136) extending first downwards from said horizontal structure (124) then rearwards parallel to the ground.

6. The frame assembly (101) as claimed in claim 5, wherein the front upper structure (119) is detachably attached to the front lower structure (120).
7. The frame assembly (101) as claimed in claim 5, wherein said front upper structure (119) having said horizontal structure (124) includes a first cross member (125), a second longitudinal member (126) and a third longitudinal member (127) connected to form a support structure open from one end.
8. The frame assembly (101) as claimed in claim 7, wherein said first cross member (125) extends in vehicle width direction, and the second longitudinal member (126) and the third longitudinal member (127) extend rearward in vehicle length direction, from both ends of the first cross member (125).
9. The frame assembly (101) as claimed in claim 8, wherein said second longitudinal member (126) and the third longitudinal member (127) are connected through at least one bottom support bridge (128).
10. The frame assembly (101) as claimed in claim 5, wherein said front upper structure (119) having the horizontal structure (124) is configured to support electrical power unit (108) secured inside the frame.
11. The frame assembly (101) as claimed in claim 5, wherein said first top member (130) and said second top member (131) extend rearwards to form a substantial V shape and increasing space between the two and then extends parallel to each other first rearward and then downwards.
12. The frame assembly (101) as claimed in claim 5, wherein the top structure (129), the head tube (122), the front support member (123), and the horizontal structure (124) define a housing for the electrical power unit (108).
13. The frame assembly (101) as claimed in claim 5, wherein the first top structure (129) is connected to the second longitudinal member (126) of the horizontal structure (124) through a first side blocking member (132).
14. The frame assembly (101) as claimed in claim 5, wherein the second top member (131) is connected to the third longitudinal member (127) of the horizontal structure (124) through a second side blocking member (133).
15. The frame assembly (101) as claimed in claim 5, wherein a top blocking structure (134), formed in a substantially C shape connects the first top member (130) and the second top member (131) at at-least one location.
16. The frame assembly (101) as claimed in claim 5, wherein the first side blocking member (132), the second side blocking member (133) and the top blocking structure (134) are configured to secure and lock the electrical power unit (108) within the frame assembly (101).
17. The frame assembly (101) as claimed in claim 5, wherein the top blocking structure (134), the first top member (130), and the second top member (131) are configured to have a mounting means for mounting the rear portion (102(b)) of the frame.
18. The frame assembly (101) as claimed in claim 5, wherein said frame assembly (101) is configured to have a rear locking member (135) to mount one or more controller unit (117) mounted rearwards of the electrical power unit (108).
19. The frame assembly (101) as claimed in claim 5, wherein the electrical power unit (108) is removable from top.
20. The frame assembly (101) as claimed in claim 5, wherein said front lower structure (120) having the pair of arc members (136) are connected to the front upper structure (119) through a front mounting bracket (139) in the front end and the pair of arc members (136) are connected to the front upper structure (119) through a rear mounting bracket (140) in the rear end.
21. The frame assembly (101) as claimed in claim 5, wherein the front mounting bracket (139) is configured to support the electrical traction unit (110) from the front and the rear mounting bracket (139, 140) supports the rear end of the electrical traction unit (110).
22. The frame assembly (101) as claimed in claim 5, wherein said rear mounting bracket (140) supports a swing arm assembly (114) on its rear side.
23. The frame assembly (101) as claimed in claim 5, wherein the electrical traction unit (110) is fitted inside the front lower structure (120), and the entire unit is assembled with the front upper structure (119), by means of the mounting points disposed at the front upper structure (119) of the frame assembly (101).
24. The frame assembly (101) as claimed in claim 5, wherein a cooling unit (118) is disposed with the electrical traction unit (110) on the front portion (102(a)) of the pair of arc members (136).
25. The frame assembly (101) as claimed in claim 5, wherein the cooling unit (118) is disposed on a connecting member (143) provided on the pair of arc members (136).
26. A two wheeled vehicle (100) comprising:
a frame assembly including a front portion (102 (a)), and a rear portion (102 (b));
said front portion (102 (a)) of the frame being disposed in front of a seat assembly (111) of the two wheeled vehicle;
said rear portion (102 (b)) of the frame assembly (101) being (102 (b)) disposed below said seat assembly (111); and
said front portion (102 (a)) and rear portion (102 (b) are detachably attached.
27. The two wheeled vehicle (100) as claimed in claim 26, wherein said front portion (102 (a)) of the frame includes a head tube (122), a front support member (123) which extends inclinedly downwards from said head tube (122), and a horizontal structure (124) which extends rearwards from a bottom portion of said front support member (123), a top structure (129), including a first top member (130) and a second top member (131), which extends inclinedly rearwards from said head tube (122).
28. The two wheeled vehicle (100) as claimed in claim 27, wherein a pair of arc members (136) which extends first downwards from said horizontal structure (124) then rearwards parallel to the ground.
29. The two wheeled vehicle (100) as claimed in claim 26, wherein said rear portion (102 (b)) of the frame includes a pair of first rear member (145) and a pair of second rear member (147).
30. The two wheeled vehicle (100) as claimed in claim 29, wherein said pair of first rear member (145), extends inclinedly upward from a pair of first mounting point (146) disposed on said first top member (130) and said second top member (131).
31. The two wheeled vehicle (100) as claimed in claim 29, wherein said pair of second rear member (147), extends rearwards horizontally from a pair of at least one rear attachment means (148) disposed on a top blocking member (134).
32. The two wheeled vehicle (100) as claimed in claim 29, wherein said first rear member (145), extends till the first rear member (145) is attached to the second rear member (147) of said vehicle (100).
33. The two-wheeled vehicle (100) as claimed in claim 26, wherein a controller unit (117) is being disposed at the rear side of an electrical power unit (108).
, Description:TECHNICAL FIELD
[0001] The present subject matter relates generally to a two-wheeled vehicle. More particularly but not exclusively the present subject matter relates to a frame assembly of said two-wheeled vehicle.
BACKGROUND
[0002] Generally, a frame, also known as a chassis is main supporting structure of the vehicle to which all other parts like wheels, electric motor, power unit(s), and other related components of the vehicle are attached. The frame acts as a skeleton capable of withstanding load and inertia of the components or parts attached to it. With the advent in technology, new features have been introduced which in turn has resulted in increase of number of parts to be accommodated in the vehicle. For example, with the introduction of electric and hybrid vehicles, requirement of packaging a battery capable of being a power source for vehicle traction is a major challenge, particularly in two wheelers where space is limited. Additionally, for traction, other related components like motor, controller and the like require additional mounting parts. Packaging of above-mentioned components with additional new parts makes the vehicle layout bulky and complex that affects ease of access for serviceability and ease of assembly.

BRIEF DESCRIPTION OF THE DRAWINGS
[0003] The details are 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 similar features and components. Figure 1 exemplarily illustrates a two-wheeled electric vehicle.
[0004] Figure 2 (a) exemplarily illustrates a side view of the front and the rear portion of the frame assembly with the components of the two-wheeled electric vehicle.
[0005] Figure 2 (b) exemplarily illustrates an exploded perspective view of the components mounted on the frame assembly.
[0006] Figure 3(a) exemplarily illustrates isometric view of the frame assembly.
[0007] Figure 3(b) exemplarily illustrates a side view of the frame assembly.
[0008] Figure 4 exemplarily illustrates an exploded view of the frame assembly.
[0009] Figure 5 exemplarily illustrates an isometric view of the front upper structure of the front portion of the frame assembly.
[00010] Figure 6 (a) exemplarily illustrates an exploded view of the front lower structure and the front upper structure of the front portion of the frame assembly.
[00011] Figure 6 (b) exemplarily illustrates a perspective side view of the front lower structure configured to mount the electrical traction unit.
[00012] Figure 7 exemplarily illustrates a side perspective view of an assembled front lower structure housing the electrical traction unit.
[00013] Figure 8 (a) exemplarily illustrates an exploded side perspective view of the rear portion of the frame assembly along with the front portion.
[00014] Figure 8 (b) exemplarily illustrates the rear portion of the frame assembly of the two-wheeled vehicle.

DETAILED DESCRIPTION
[0001] In electric or hybrid vehicles, while packaging a battery as power source and related components, to facilitate ease of access, the overall width of the vehicle frame is increased to provide working space between the components, but this layout results in a bulky chassis which is not desirable. Generally, in electric and hybrid vehicles, the basic frame is modified to accommodate all the components of the vehicle, which increases stress on the frame. In order to cope with this additional stress, frame strength and stiffness is required to be increased, which require heavier frame assembly.
[0002] Additionally, using a single frame to mount all the components, is not desirable. Generally, vehicle parts directly involved in vehicle traction, such as motor, transmission assembly and the like, generate a lot of vibration and that creates stress on the frame at a local portion. In such cases, if a portion of the frame gets damaged, the entire frame needs to be replaced which adds to the cost of the vehicle from manufacturing as well as customer point of view.
Therefore, a frame assembly is required for hybrid and electric vehicles, that is capable of meeting above mentioned and other related requirements while overcoming all problems of known art.
[0003] An objective of the present subject matter is to provide an improved layout of a frame assembly with compact packaging, high frame strength and stiffness to cope with additional stress, facilitate efficient assembly, accessibility, and serviceability of components on a frame of a vehicle. The present subject matter is described using an exemplary electric two-wheeled vehicle, whereas the claimed subject matter is applicable to two-wheeled electric and hybrid vehicles, with required changes and without deviating from the scope of invention. In the present subject matter, a two-wheeled vehicle comprises of a frame assembly having a front portion and a rear portion. The front portion and the rear portion are configured to be detachably attachable forming the frame of the vehicle such that the detachable region is substantially below the rider seating area and substantially rearwards of a power unit of the vehicle.
[0004] As per an aspect of the present subject matter, a rear end of the front portion includes at least one rear attachment means, and a front end of the rear portion includes at least one front attachment means. The at least one rear attachment means and the front attachment means, being detachably attached to form the frame assembly wherein the detachable region is substantially below the rider seat assembly and rearward of the power train unit of the vehicle.
[0005] As per an aspect of the present subject matter, the rear portion supports one or more of a seat assembly, a utility unit, a pillion seat of the two wheeled vehicle.
[0006] As per an aspect of the present subject matter, the front portion includes a front upper structure and a front lower structure, the front upper structure being configured to accommodate one or more electrical power units, and wherein said front lower structure is configured to accommodate an electrical traction unit.
[0007] As per another embodiment of the present subject matter, a frame assembly comprises of a front portion and a rear portion, the front portion includes an upper portion and a lower portion. The upper portion includes a head tube, a front support member extending inclinedly downwards from the head tube, a horizontal structure extending rearwards from a bottom portion of the front support member, a top structure, including a first top member and a second top member, extending inclinedly rearwards from the head tube thereby forming a caged structure to secure a power storage unit. The lower portion includes a pair of support member extending first downwards from said horizontal member and then rearwards parallel to the ground.
[0008] As per an aspect of the present subject matter, the front upper structure is detachably attached to the front lower structure.
[0009] As per an aspect of the present subject matter, the front upper structure having the horizontal member includes a first cross member, a second longitudinal member and a third longitudinal member connected to form a support structure open from one end. The first cross member extends in vehicle width direction. The second longitudinal member and the third longitudinal member extend rearward in vehicle length direction, from both ends of the first cross member. The second longitudinal member and the third longitudinal member are connected through at least one bottom support bridge. As per an aspect of the present subject matter, the horizontal member is configured to support electrical power unit secured inside the frame. The first top member and the second top member extend rearwards to form a substantial V shape and increasing space between the two and then extends parallel to each other, first rearward and then downwards. The top structure, the head tube, the front support member, and the horizontal member define a housing to provide a secured location for the electrical power unit within the vehicle frame.
[00010] As per an aspect of the present subject matter, the first top member is connected to the second longitudinal member of the horizontal member through a first side blocking member. The second top member is connected to the third longitudinal member of the horizontal member through a second side blocking member. A top blocking member, formed in a substantially C shape connects the first top member and the second top member at at-least one location.
[00011] As per another aspect of the present subject matter, the first side blocking member, the second side blocking member and the top blocking member are configured to secure and lock the electrical power unit within the frame assembly. The top blocking structure, the first top member, and the second top member are configured to have a mounting means for mounting rear portion of the frame.
[00012] As per another aspect of the present subject matter, the frame assembly is configured to have a rear locking member to mount one or more controller unit mounted rearwards of the electrical power unit and the electrical power unit is removable from top.
[00013] As per yet another aspect of the present subject matter, the front lower structure includes the pair of arc member, connected to the front upper structure through a front mounting bracket in the front end and the pair of arc member, connected to the front upper structure through a rear mounting bracket in the rear end. The front mounting bracket is configured to support the electrical traction unit from the front and the rear mounting bracket supports the rear end of the electrical traction unit.
[00014] As per yet another aspect of the present subject matter, the rear mounting bracket supports a swing arm assembly on its rear side.
[00015] As per another aspect of the present subject matter, the electrical traction unit is first fitted inside the front lower structure, and then the entire unit is assembled with the front upper structure, using the mounting points disposed at the front upper structure of the frame assembly.
[00016] As per another aspect of the present subject matter, a cooling unit is disposed with the electrical traction unit on the front portion of the pair of arc members. The cooling unit is disposed on a connecting member provided on the pair of arc members.
[00017] According to another embodiment of the present subject matter, a two-wheeled vehicle comprises of a frame assembly including a front portion and a rear portion. The front portion of the frame being disposed in front of a seat assembly of the two-wheeled vehicle and the rear portion of the frame assembly being disposed below said seat assembly. The front portion and the rear portion are detachably attached.
[00018] As per an aspect of the present subject matter, the front portion of the frame includes a head tube, a front support member extends inclinedly downwards from said head tube, and a horizontal member which extends rearwards from a bottom portion of said front support member, a top structure, includes a first top member and a second top member, which extends inclinedly rearwards from said head tube. A pair of arc member which extends first downwards from said horizontal member then rearwards parallel to the ground.
[00019] As per an aspect of the present subject matter, the rear portion includes a pair of first rear member and a pair of second rear member. The pair of first rear member, which extends inclinedly upward from a pair of first mounting point disposed on said first top member and said second top member. The pair of second rear member extends rearwards horizontally from a pair of at least one rear attachment means disposed on a top blocking member. The first rear member extends till the first rear member touches the second rear member of said two-wheeled vehicle.
[00020] As per an aspect of the present subject matter, the front upper structure is configured to accommodate an electrical power unit. A controller unit is being disposed at the rear side of said electrical power unit. The present subject matter is further described with reference to accompanying figures. It should be noted that the description and figures merely illustrate 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.
[00021] Fig.1 exemplarily illustrates a two-wheeled electric vehicle 100. The two-wheeled vehicle 100 comprises of a frame assembly 101 having a front portion 102(a), a rear portion 102(b). The two-wheeled vehicle 100 includes a handlebar assembly 103, a steering column (not shown), a headlamp 105, a front suspension 106, a front wheel assembly 107, an electrical power unit 108, an electrical traction unit 110, a seat assembly 111, a rear wheel assembly 112, a rear suspension 113, and a swingarm assembly 114. The front portion 102(a) includes the handlebar assembly 103 mounted on the steering column (not shown) on one end and the headlamp 105 mounted ahead of the handlebar assembly 103. The other end of the steering column (not shown) is connected with the front suspension 106 at one end. The other end of said front suspension 106 is connected to the front wheel assembly 107 which drives the vehicle 100. The electrical power unit 108 is disposed in the front portion 102(a) of the frame assembly 101. The electrical traction unit 110 is disposed below the electrical power unit 108 in the front portion 102(a) of the frame assembly 101. The seat assembly 111 is disposed on the rear portion 102(b) of the frame assembly 101. The rear wheel assembly 112 is provided in the rear portion 102(b) such that the rear suspension 113 is connected to the rear wheel assembly 112 at its one end and the other end is connected to the rear portion 102(b) of the frame assembly 101. The swingarm assembly 114 is connected to the rear wheel assembly 112 at one end and to the frame in the front portion 102(a) of the vehicle 100.
[00022] Fig.2(a) exemplarily illustrates a side view of the front and the rear portion of the frame assembly 101 with the components of the two-wheeled electric vehicle 100. Fig.2(b) exemplarily illustrates an exploded perspective view of the components mounted on the frame assembly 101. The frame of the two-wheeled electric vehicle 100 is designed to accommodate all the electrical components and parts in such a manner that the mass distribution is centralised resulting in the centre of gravity being disposed substantially closer to the central plane of the vehicle 100 so as to enhance balance and dynamic performance of the vehicle 100. The packaging of all the components is done keeping in mind that the parts and the components are easily assembled and easily accessible during servicing or maintenance. The frame assembly 101 accommodates the electrical power unit 108 in the front portion of the vehicle 100. The electrical power unit 108 is placed from the top of the vehicle 100 along the vehicle width direction and is securely mounted to the frame assembly 101. The electrical power unit 108 outer wall has provision of a vent openings 116 which are cut outs provided on the outer wall of the electrical power unit 108 that enable air flow from one or more of a cooling supply medium consisting of the atmosphere and a cooling system (not shown) to efficiently pass through the electrical power unit 108 and the components. The electrical power unit 108 is integrated with a battery (not shown), battery controller (not shown), a charger unit 109 and a charging port 115 is assembled together as a sub assembly and then the electrical power unit 108 is mounted onto the frame assembly 101.
[00023] A controller unit 117 for controlling major aspects of the vehicle 100 is assembled and mounted behind the electrical power unit 108. The electrical traction unit 110 is positioned at the bottom of the frame below the electrical power unit 108 such that it does not interfere with the electrical power unit 108 during assembly or servicing. The electrical traction unit 110 is also mounted as a sub assembly to the front portion in the vehicle width direction. The electrical traction unit 110 is positioned in the lower part of the front portion so that a transmission system (not shown) is directly connected with the electrical traction unit without any hinderance. This ensures minimum transmission losses and thus facilitates effective functioning of the electrical traction unit 110. As per an additional embodiment, a cooling unit 118 is disposed at the front side of the electrical traction unit 110 to cool the traction unit 110.
[00024] Fig.3(a) exemplarily illustrates an isometric view of the frame assembly 101. Fig.3(b) exemplarily illustrates a side view of the frame assembly 101. The frame assembly 101 of the two-wheeled vehicle 100 includes the front portion 102(a) and the rear portion 102(b). The front portion 102(a) of the frame assembly 101 has a front upper structure 119 and a front lower structure 120. The front upper structure 119 is disposed in an upper portion of the front portion 102 (a) and the front lower structure 120 is disposed in a lower portion of the front portion 102 (a) of said frame. A rear structure 121 is disposed in the rear portion 102 (b) of said frame. The front portion 102 (a) and the rear portion 102 (b) are configured to be detachably attachable forming the frame of the vehicle 100. The detachable feature is configured in a region substantially below the rider seating and rearwards of the electrical power unit 108 of the vehicle 100. This enables a stable and secure frame configuration to mount a powertrain unit comprising of the electrical power unit 108 and electrical traction unit 110. As per an alternate embodiment the rear portion of the frame assembly 101 is configured to be modular such that different rear structures can be configured to achieve different vehicle designs like commuter, sport, off-road etc. as well as a rider only type of configuration with a utility storage unit mounted instead of the rear portion 102(b) of the frame assembly 101. The front upper structure 119 accommodates the electrical power unit (not shown in the fig.) and the front lower structure 120 accommodates the electrical traction unit (not shown). The front lower structure 120 is disposed below the front upper structure 119 by means of mounting (not shown). The rear portion 102(b) is disposed behind the front portion 102(a) of the vehicle 100. The positioning of the electrical traction unit 110 at the bottom side of the frame assembly 101 is done to ensure that it do not interfere with the electrical power unit. In addition to this, the mounting position of the electrical traction unit 110 is easily accessible during assembly and serviceability. The location and mounting configuration of electrical power unit 108 and the electrical traction unit 110 enables effective weight distribution. This configuration balances the mass distribution and thereby disposes the centre of gravity closer to the central plane of the vehicle 100 thereby improving vehicle stability and overall vehicle ride & handling performance. In the present embodiment, the frame of the vehicle 100 is a tubular structure. The diameter of the frame tube has not been changed, so there is no addition of any material to the frame assembly 101. The cross section of all the major members of the frame as per the current invention are substantially similar to a cross section of a typical conventional two wheeled vehicle consisting of a conventional IC engine set-up. The cage structure of the front upper structure 119 coupled with a cage structure of the front lower structure 120 the tubular frame used in the frame assembly 101 of the vehicle 100 to enclose the parts of the vehicle 100, improves stiffness and provides strength to hold the components.
[00025] Fig.4 exemplarily illustrates an exploded view of the frame assembly 101. In the present embodiment, the front upper structure 119, the front lower structure 120, and the rear structure 121 of the frame assembly 101 are detachably attachable. This enables the access of the components separately without taking out each part individually. Also, if one portion of the frame of the vehicle 100 gets damaged, then only that part of the frame is replaced and the entire frame of the vehicle 100 need not be replaced. This is a cost-effective method which reduces the burden on the customer when only a portion of vehicle frame gets damaged. Fig.5 exemplarily illustrates an isometric view of the front upper structure 119 of the front portion 102(a) of the frame assembly 101. The front upper structure 119 of the front portion 102(a) of the vehicle 100 includes a head tube 122, a front support member 123 extending inclinedly downwards from said head tube 122, a horizontal structure 124 extending rearwards from a bottom portion of the front support member 123. The horizontal structure 124 includes a first cross member 125, a second longitudinal member 126 and a third longitudinal member 127 connected to form a support structure open from one end. The first cross member 125 extends in vehicle width direction, and the second longitudinal member 126 and the third longitudinal member 127 extend rearward in vehicle length direction, from both ends of the first cross member 125. In the present embodiment, the second longitudinal member 126 and the third longitudinal member 127 are connected through more than one bottom support bridge 128. The horizontal structure 124 along with the bottom support bridge 128 supports the electrical power unit (not shown) inside the frame assembly 101.
[00026] The front upper structure 119 of the front portion 102(a) of the vehicle 100 also includes a top structure 129, including a first top member 130 and a second top member 131, extending inclinedly rearwards from the head tube 122. The first top member 130 and the second top member 131 extend rearwards to form an increasing space forming a substantial ‘V’ shaped region between the two members (130,131) and then extends parallel to each other first rearward and then downwards. The first top member 130 is connected to the second longitudinal member 126 of the horizontal structure 124 through a first side blocking member 132. The second top member 131 is connected to the third longitudinal member 127 of the horizontal structure 124 through a second side blocking member 133. A top blocking structure 134, formed substantially in a C shape is connecting the first top member 130 and the second top member 131 at at-least one location. The top structure 129, the head tube 122, the front support member 123, and the horizontal structure 124 define a housing for the electrical power unit (not shown) and the first side blocking member 132, the second side blocking member 133 and the top blocking structure 134 are configured to lock the electrical power unit (not shown) within the frame assembly 101. A rear locking member 135 is provided to mount the controller unit (not shown) on the lower side of the top structure 129 which connects the first top member 130 and the second top member 131, and is placed behind the electrical power unit (not shown). Thus, the front upper structure 119 forms an enclosed cage type block to securely and safely dispose and mount the electrical power unit 108 within it and a controller unit 117 at one side on the outside of the cage.
[00027] Fig.6(a) exemplarily illustrates an exploded view of the front lower structure 120 and the front upper structure 119 of the front portion 102(a) of the frame assembly 101 and Fig.6(b) exemplarily illustrates a perspective side view of the front lower structure 120 configured to mount the electrical traction unit (not shown). The front lower structure 120 of the front portion 102(a) is detachably attachable with the front upper structure 119 of the front portion 102(a) of the frame assembly 101. In the present embodiment, the front lower structure 120 has a pair of arc members 136 that extends firstly in downward direction from the horizontal structure 124 and then extends rearwards parallel to the ground. A rear enclosing member 137 is provided on the end of the pair of arc members 136 and extends in upward direction to enclose the electrical traction unit (not shown) from the rear side, thus securing the traction unit (not shown) by means of a plurality of fasteners 138. The pair of arc members 136 are connected to a front mounting bracket 139 disposed on lower side of the horizontal structure 124, at the front end and the pair of arc members 136 are connected to a rear mounting bracket 140 in the rear end wherein the rear mounting bracket 140 are disposed on the lower end of the first and second top member 130, 131. The front mounting bracket 139 is configured to support the electrical traction unit (not shown) from the front attached to the bottom of the horizontal structure 124. The rear mounting bracket 140 attached to the rear end portion of the first top member 130 and the second top member 131, supports the rear end of the electrical traction unit (not shown). A front supporting member 142 is provided inside the front side of the pair of arc members 136 so that the electrical traction unit (not shown) rests on the supporting member 142 firmly and do not move during its operation. The lower side of the rear mounting bracket 140 also supports a swing arm assembly (not shown) on its rear side. The electrical traction unit (not shown) is first fitted inside the front lower structure 120, and then the entire unit is assembled with the front upper structure 119, using the mounting points at the front upper structure 119 of the frame assembly 101.
[00028] Fig. 7 exemplarily illustrates a side perspective view of an assembled front lower structure 120 housing the electrical traction unit 110. The cooling unit 118 is disposed on a connecting member 143 provided on the pair of arc member 136 by a pair of fastening means 144. The cooling unit 118 is positioned in front of the electrical traction unit 110 to ensure that atmospheric air passes through the cooling unit 118 for its enhanced effect of cooling the traction unit 110 while in operation.
[00029] Fig. 8 (a) exemplarily illustrates an exploded side perspective view of the rear portion 102(b) of the frame assembly 101 along with the front portion 102(a). Fig. 8 (b) exemplarily illustrates the rear portion 102(b) of the frame assembly 101 of the two-wheeled vehicle 100. The rear portion 102(b) is detachably attachable with the front portion 102(b) of the frame assembly 101. The rear portion 102(b) of the vehicle 100 includes a pair of first rear member 145, extending inclinedly upward from a first mounting point 146 attached on the first top member 130 and the second top member 131. A pair of second rear member 147, extending rearwards and substantially horizontally from at least one rear attachment means 148 attached on the top blocking structure 134. The pair of first rear member 145 extends till the pair of first rear member 145 touches the pair of second rear member 147 of the frame assembly 101. The pair of second rear member 147 is connected at its rear end through a rear cross bridge 149 to support the rear structure 121 of the frame assembly 101. Many other improvements and modifications may be incorporated herein without deviating from the scope of the invention.

List of Reference numerals
100: Two-wheeled vehicle
101: Frame assembly of 100102 (a): Front portion of 101
102 (b): Rear portion of 101
103: Handlebar assembly of 100
105: Headlamp of 100
106: Front suspension of 100
107: Front wheel assembly of 100
108: Electrical power unit of 100
109: Charger unit of 108
110: Electrical traction unit of 100
111: Seat assembly of 100
112: Rear wheel assembly of 100
113: Rear suspension of 100
114: Swingarm assembly of 100
116: Vent openings of 108
115: Charging port of 108
117: Controller unit of 100
118: Cooling unit of 110
119: Front upper structure of 102(a)
120: Front lower structure of 102(a)
121: Rear structure of 102(b)
122: Head tube of 101
123: Front support member of 101
124: Horizontal member of 101
125: First cross member of 124
126: Second longitudinal member of 124
127: Third longitudinal member of 124
128: Bottom support bridge of 124
129: Top structure of 101
130: First top member of 129
131: Second top member of 129
132: First side blocking member between 126 and 130
133: Second side blocking member between 127 and 131
134: Top blocking member on 130 and 131
135: Rear locking member of 117
136: Pair of arc member of 120
137: Rear enclosing member of 120
138: Plurality of fasteners of 137
139: Front mounting bracket on 119
140: Rear mounting bracket on 119
142: Front supporting member of 120
143: Connecting member of 118
144: Fastening means of 118
145: Pair of first rear member of 102(b)
146: First mounting point on 102 (a)
147: Pair of second rear member of 102(b)
148: Rear attachment means of 102(a)
148 (a): Front attachment means of 102(b)
149: Rear cross bridge of of 102(b)