Claims:We Claim;
1. A suspension assembly (130) for a two wheeled vehicle (100), where said suspension assembly (130) comprising:

an outer tube (303);
an inner tube (302) having two ends (302a, 302b) where one end (302b) is slidably connected to one end of said outer tube (303);
said another end (302a) of inner tube (302) is connected to a handlebar assembly (126) of said vehicle (100) with a pair of mounting brackets (136, 137);
said pair of mounting brackets (136, 137) attaches said suspension assembly (130) with said vehicle (100);
A bolt cap member (301) attaches said inner tube (302) with said one mounting bracket (136) of said pair of mounting brackets (136, 137); and
a stud member (406) having threaded portion (407) at either side (408, 409), is detachably attached to said bolt cap member (301) of said suspension assembly (130).
2. The suspension assembly (130) as claimed in claim 1, wherein said pair of mounting brackets (136, 137) includes top mounting bracket (136) and lower mounting bracket (137).
3. A suspension assembly (130) for a two wheeled vehicle (100), where said suspension assembly (130) comprising;
an inner tube (302) having two ends (302a, 302b) where one end (302b) is slidably connected to one end of said outer tube (303);
said another end (302a) of inner tube (302) is connected to a handlebar assembly (126) of said vehicle (100) with a pair of mounting brackets (136, 137);
said pair of mounting brackets (136, 137) attaches said suspension assembly (130) with said vehicle (100);
a stud member (406) having threaded portion (407) at either side (408, 409), is detachably attached to a bolt cap member (301) of said suspension assembly (130) and said at least one side (408) of said stud member (406) is projected through an opening (504) provided in said top mounting bracket (136).

4. The suspension assembly (130) as claimed in claim 3, wherein said top mounting bracket (136) is supported on a flat surface (403) of an upper portion (404) of said bolt cap member (301), where said bolt cap member (301) is attached to said inner tube (302).
5. The suspension assembly (130) as claimed in claim 4, wherein said another end (408) of said stud member (406) is sealed by a top nut (305) and a washer (503) at said upper portion of the top mounting bracket (136).
6. The suspension assembly (130) as claimed in claim 3, wherein said bolt cap member (301) includes two portions, said upper portion (404) and a lower portion (405) where said upper portion (404) includes a groove (401) and a flat land surface (403) to accommodate said top mounting bracket (136).
7. The suspension assembly (130) as claimed in claim 6, wherein said groove has an outer diameter D.
8. The suspension assembly (130) as claimed in claim 7, wherein said predetermined range of outer diameter D is in range of 10mm to 15mm.
9. The suspension assembly (130) as claimed in claim 6, wherein said lower portion (405) of said bolt cap member assembly (301a) has an additional circumferential groove portion (410) which accommodates sealing member.
10. The suspension assembly (130) as claimed in claim 1 or Claim 3, wherein said bolt cap member (301) has the hollow portion having threaded portion (402a) to attach one side (409) of said stud member (406).
11. The suspension assembly (130) as claimed in claim 1 or Claim 3, wherein said bolt cap member (301) has flat land portions (400a, 400b).
12. The suspension assembly (130) as claimed in claim 1 or Claim 3, wherein said bolt cap member (301) of said suspension assembly (130) has a threaded portion (402) on said lower portion (405) to attach said inner tube (302) of said suspension assembly (130).
, Description:TECHNICAL FIELD
[0001] The present subject matter relates generally to two wheeled vehicle straddle type vehicles. More particularly, the present subject matter relates to a suspension assembly for the two wheeled vehicles.
BACKGROUND
[0002] Typically, vehicle layout design for a backbone frame type vehicle features a step-through frame and a flat surface called as a floorboard used for disposing legs of a rider when the rider puts his/her feet on the floorboard. Further, the vehicle features bodywork that conceals all or most of the mechanisms. Since, most of the parts in the vehicle are concealed by the body, the body parts are to be designed such that they fit into the body space achieving optimum utilization of space in the vehicle. Traditionally, the small size vehicle wheels are smaller than conventional wheels. The smaller size of the small size vehicle, lower handle bar height in addition to compact packaging of suspension assembly and smaller wheels requires a vehicle to have small suspension assembly. Therefore, taking space constraint and the typical vehicle layout of the small size vehicles into consideration, a suitable small suspension assembly is used in the backbone frame type vehicle.
BRIEF DESCRIPTION OF THE DRAWINGS
[0003] The detailed description is described with reference to a saddle type two wheeled vehicle along with the accompanying figures. The same numbers are used throughout the drawings to reference like features and components.
[0004] Fig.1 is a side view of the two wheeled straddle type vehicles.
[0005] Fig. 2 is a perspective view of a frame as per one embodiment of the present invention.
[0006] Fig. 3 is an assembled view of the suspension assembly as per one embodiment of the present invention.
[0007] Fig. 4 is an isometric top view of the bolt cap member as per one embodiment of the present invention.
[0008] Fig.4a is an assembled view of the bolt cap member assembly as per one embodiment of the present invention.
[0009] Fig. 4b is a side view of the stud member as per one embodiment of the present invention.
[00010] Fig. 4c is a sectional view of the bolt cap member assembly as per one embodiment of the present invention.
[00011] Fig. 5 is a sectional view of the stud member with the top mounting bracket and the bolt cap member as per one embodiment of the present invention.
[00012] Fig. 5a is an exploded view of the stud member as per one embodiment of the present invention.
[00013] Fig. 6 is a graphical representation of the angle of rotation top nut (fastener) with respect to the torque as per one embodiment of the present invention.
DETAILED DESCRIPTION
[00014] Generally, several types of vehicles utilize one or more suspension assemblies operably positioned between one or more wheels of the vehicle and the body of the vehicle. The operator control is improved by the suspension assemblies as it absorbs the bumps or any other irregularities, in the surface where the vehicle is moving/traversing. The straddle/ saddle/ step through type vehicles having a single front wheel often use a suspension assembly to absorb the bumps encountered by the front wheel. The elastic member and the damping fluid present inside the suspension assembly govern the performance of the suspension assembly and also maintain the stability of the vehicle.
[00015] Such suspension assemblies typically include a pair of fork legs arranged on opposing sides of the front wheel. Each fork leg includes an upper fork tube engaged with a lower fork tube. A separately formed bracket member interconnects an upper end of the fork legs and is coupled to a handlebar assembly of the vehicle. The front wheel of the vehicle is usually supported by a lower end of the fork legs. Impact forces are imparted on the front wheel as the vehicle encounters bumps, or other irregularities, of the surface on which it is traversing. These forces are transferred to the junction of the bracket member and the upper fork tubes.
[00016] Further, there are two main types of suspension assembly which are in current use, namely telescopic forks and leading link forks respectively. The telescopic fork comprises of two parallel legs each formed as a pair of co-centric tubular member having resilient suspension means acting between the two, and a wheel spindle is rigidly connected to and extends between the lower end of two legs. Further, typically, the telescopic type of small suspension assembly used in the vehicles operate under two modes, viz., an extension stroke, and a compression stroke. Further, the load carrying capacity of the suspension assembly depends on the elastic member which is typically a compression spring, space available for the compression spring and the quantity of oil filled inside the suspension assembly.
[00017] In the leading link fork arrangement, a pair of parallel rigids, and usually tubular, legs are provided, and the wheel spindle is connected thereto by a pair of suspension links which are pivotally attached to the lower ends of the legs. Suspension springs are connected at their ends to points part-way along the suspension links and the legs respectively. In this case therefore the only relative movement of parts of the assembly to provide the suspension, is at the pivotal connection of the suspension links and the fork legs.
[00018] Typically, a conventional suspension assembly comprises of the pair of fork assemblies. Further, the suspension assembly comprises an inner tube slidably connected to an outer tube. The inner tube of the suspension assembly is mounted to the handle bar assembly and the outer tube is mounted to an axle of a front wheel. The main spring assembled inside the fork is engaged to the anchor plate present in anchor rod assembly which has provisions to which one end of main spring is engaged. Other end of the main spring is also engaged to a top anchor which has anchor plate similar to that provided in anchor rod assembly. The top anchor consists of anchor plate which is welded to a threaded locating member. The top anchor plate with spring engaged to it is held in its position by fastening a nut to a threaded locating member further supported by a bent welded washer in the inner tube. One or more bushes are provided on the outer diameter of spring to avoid spring rubbing with inner tube. The suspension assembly further consists of one or more slide bushes mounted on the inner tube which prevent the inner tube rubbing with the outer tube during stroking action of suspension assembly. A guide bush is mounted onto the outer tube which guides the inner tube sliding motion.
[00019] Suspension assembly is also filled with hydraulic fluid which helps in lubricating various child parts present inside the fork as well as dissipating the heat energy generated as a result of damping of the shock loads & vibrations. A pair of dust seal and oil seal is also provided to avoid entry of foreign particles into the fork assembly and leakage of hydraulic fluid from the fork. In this kind of design, it is the top anchor which is used as a guide to locate suspension assembly onto the top mounting bracket and the clamping of fork to top mounting bracket is done by fastening a nut to the threaded portion of the top anchor.
[00020] The low-cost design of the suspension assembly does not have orifice damping unlike conventional suspension system but has friction damping. Moreover, due to usage of bent washer in the inner tube, the top of the fork of suspension assembly is not closed and hence air load is not generated. The fact that both air load and hydraulic damping is absent in this type of suspension assembly makes the riding comfort always lower to that achieved by a conventional telescopic suspension system.
[00021] Further, the performance of suspension assembly to deliver improved riding comfort is achieved by introducing hydraulic damping and air load characteristics. This requires changes in child parts one of which is the addition of bolt cap member to provide sealing and generate air load. It is in this aspect that a bolt cap member is used to mount the inner tube of the suspension assembly to the top mounting bracket of handle bar assembly such that it seals the pair of forks which forms a part of suspension assembly.
[00022] The bolt cap member is connected to the inner tube either through thread engagement or through a snap ring. The bolt cap member supports the main spring of forks which forms a part of suspension assembly. Further, a sealing member is provided on the bolt cap nut which prevents leakage of fluid present inside the fork.
[00023] Further, a piston rod is disposed and connected inside the outer tube. A portion of the piston rod provides a seating surface to the elastic member. The piston rod consists of one or more holes configured to provide required damping due to the motion of damping fluid inside the suspension assembly. The elastic member is disposed inside the inner tube. The elastic member receives support from the piston head. The inner tube is prevented from slipping out of the outer tube by assembling with the piston head, a rebound spring, and further interaction with the inner tube. Further, to facilitate proper functioning of the suspension assembly, a pair of bushes are disposed either on the inner tube or on the outer tube, one mounted on the outer tube and other mounted either on the outer tube or the inner tube, the pair of bushes guides the inner tube to facilitate the sliding motion over the outer tube. Typically, the outer tube having the pair of bushes is made of aluminum. A seal member held in position by a snap ring is assembled in the outer tube to avoid leakage of hydraulic fluid from the fork. Additional dust seal member is also used which prevents entry of foreign particles inside the fork and contamination of hydraulic fluid, thereby preventing damage to the seal member. Suspension assembly further consists of a spindle taper which generates required force during full stroke condition and prevents the inner tube assembly from bottoming.
[00024] Further, spinning is done at one end of the inner tube which provides required seating support to a rebound spring or a rebound rubber. Rebound spring or rubber restricts the rebound stroke of the fork. The separation of inner tube from outer tube is avoided by the piston head, rebound spring/rubber and inner tube interaction.
[00025] Furthermore, in state of art, the projected portion is a single integral part of the bolt cap member which is used to guide the top mounting bracket of the two wheeled straddle type vehicle to the inner tube of suspension assembly for attaching suspension assembly to the top mounting bracket of handle bar assembly of the two wheeled straddle type vehicle. Further, the bolt cap member is divided into two parts i.e. upper portion and lower portion, where upper portion includes the flat surface, and lower portion includes the threaded portion. The inner tube is attached to the handle bar assembly by the threaded portion present on the lower part of the bolt cap member. Further, when the top mounting bracket is guided by the projected portion and placed on the upper portion of the bolt cap member, the flat surface and the projected portion, experience load because of the force exerted by the top mounting bracket. Further, as the projected portion is fixedly attached on the flat portion present at the upper portion of the bolt cap member, the end of the projected portion, which is fixedly attached to the flat portion of the upper part, also experiences force, which results in breakage of the projected portion, thereby restricting the assembling of the components.
[00026] Hence, there exists a challenge of designing an efficient stud member with the bolt cap member, which can satisfactorily attach the suspension assembly with the handle bar assembly and also, act as the guiding member for the top mounting bracket to get attached with the bolt cap member without any major change in design and manufacturing set-up of the vehicle.
[00027] Therefore, there is a need to have an improved stud member with the bolt cap member which overcomes all of the above problems and other problems known in the art.
[00028] Hence, it becomes essential to improve the mounting design the stud member. The present invention provides a solution to the above problems while meeting the requirements of minimum modifications in the two wheeled straddle type vehicles at low cost with ease of manufacturing, ease of assembly, increasing rider comfort etc.
[00029] As per one aspect of the present invention, the suspension assembly for a vehicle comprises a pair of forks. The pair of forks each comprises an outer tube and an inner tube, where the inner tube has two ends where one end is slidably connected to one end of the outer tube and another end is attached to the bolt cap member. One end of the pair of forks is mounted to a wheel axle and another end of the pair of forks is attached to a bracket assembly. The bracket assembly is, for example, a lower bracket in scooter type vehicles and backbone frame type vehicles and motorcycles including both the lower mounting brackets and the top mounting brackets holding the handlebar assembly. An elastic member is disposed inside the inner tube. The outer tube is connected to the wheel axle and the inner tube is connected to the handlebar assembly.
[00030] As per one aspect of the present invention, the inner tube of the suspension assembly is fastened by the bolt cap member having outer threading which conforms with the profile of the threading present in the inner tube to secure the rigid attachment of the inner tube.
[00031] As per one aspect of the present invention, the bolt cap member has two portions that are upper and lower portions. The lower portion further has the hollow portion having threaded member present inside the lower portion and further the outer part of the lower portion also has the threaded portion which is detachably attached to the inner tube of suspension assembly to ensure rigid attachment of the inner tube.
[00032] As per one aspect of the present invention, the upper portion of the bolt cap member has flat surface and depressed portion termed as grooves, which accommodates the stud member. The stud member, has the threaded portion present on either side, where one side of the stud member is detachably attached to the bolt cap member. Further, the threaded portion present on one side of the stud member is interlocked with the threaded portion present in the hollow portion inside the lower portion of the bolt cap member, which ensure the strength of the components.
[00033] As per one aspect of the present invention, another side of the stud having a threaded portion accommodates the top mounting bracket, where the load of the top mounting bracket distributes on the flat surface of the bolt cap member and not concentrated at the end of the stud member due to the presence of grooves, where the stud member is detachably attached to the bolt cap member. Further, the grooves present at the upper portion of the bolt cap member ensures the avoidance of breakage of the stud member from its edge, thereby enabling ease of assembly.
[00034] Further, as per one aspect of the present invention, the top face of another side of the stud member after accommodating the top mounting bracket, is detachably attached to the handle bar assembly of the vehicle with the top nut and a washer, which ensures rigid attachment of the suspension assembly with the handle bar assembly of the two wheeled straddle type vehicle, and also, ensures that the stud member act as the guiding member for the suspension assembly which is getting attached with the handle bar assembly of the two wheeled straddle type vehicle with the help of the top mounting bracket.
[00035] Various other features of the invention are described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers generally indicate identical, functionally similar, and/or structurally similar elements. The drawing in which an element first appears is indicated by the leftmost digit(s) in the corresponding reference number. With reference to the accompanying drawings, wherein the same reference numerals will be used to identify the same or similar elements throughout the several views. Further, the present subject matter can be implemented on both the terminals of cylindrical cells.
[00036] In the ensuing exemplary aspects, the vehicle is a step through type vehicle. However, it is contemplated that the concepts of the present invention may be applied to any of the two wheeled vehicles without defeating the spirit of the invention.
[00037] Fig. 1 is a left side view of an exemplary two-wheeled step through type vehicle, in accordance with an embodiment of present subject matter. The vehicle (100) has a mono-tube type frame (101), which acts as the skeleton for bearing the loads and is also referred to as backbone frame as (shown in Fig 2). Instrument cluster (119) is mounted on handle bar assembly (126). The handle bar assembly (126) is pivotally disposed through the head tube where it includes brake levers (113). The handle bar assembly (126) is connected to a front wheel (129) by one or more suspension(s) assembly (130). The handle bar assembly (126) is connected to the front wheel (129) by using a pair of mounting brackets namely top mounting brackets (136) and lower mounting brackets (137). A front fender (131) is disposed above the front wheel (129) for covering at least a portion of the front wheel (129). A leg shield (112) is provided on the vehicle (100). A fuel tank (103) having fuel cap (114) is mounted to the main tube (101b) (as shown in Fig. 2) of the mono-tube type frame (101) and it is disposed in the front portion F of a step-through space of the mono-tube type frame (101). The vehicle (100) has lighting means which includes Head lamp (127), Tail lamp (106), Turning indicators which includes front side indicators (111) and rear side indicator (102) respectively and daytime running lamp (104). The power unit (125) is mounted to the lower portion of said mono-tube type frame (101). In an embodiment, the power unit (125) is an IC power unit. The fuel tank (103) is functionally connected to the power unit (125).
[00038] In an embodiment, cylinder axis (C-C’) inclined to a front of said vehicle (100) in a substantially forward rearward direction. A swing arm (134) is swingably connected to the mono-tube type frame (101). A rear wheel (133) is rotatably supported by the swing arm (134). One or more rear suspension(s) (135) connect the swing arm (134) at an angle, to sustain both the radial and axial forces occurring due to wheel reaction, to the mono-tube type frame (101). A license plate (105) and reflector (116) mounted on a rear fender (128) is disposed above the rear wheel (133). A seat assembly (132a, 132b) is disposed at a rear portion (R) of the step-through space. In an embodiment, the seat assembly (132) includes a rider seat (132a), and a pillion seat (132b). The vehicle (100) is provided with the grab rail (109). Further, the seat assembly (132a, 132b) is positioned above the rear wheel (133). The vehicle is supported by a center stand (120) mounted to the frame assembly. A tool box (110) is provided on the left side of said vehicle (100). A cover member (118) is mounted on down tube (101c) (as shown in Fig. 2). The cover member (118) covers at least a portion of the powerunit (125).
[00039] The powerunit (125) includes an, an air intake system (not shown), an exhaust system (not shown), and a starter system (not shown). The starter system includes an electric starter mechanism or a mechanical starter mechanism. The electrical starter system is powered by an auxiliary power source, for cranking the powerunit. Power generated by powerunit is transferred to the rear wheel (133) through a transmission system (not shown).
[00040] The powerunit (125) comprises a cylinder head (123), a cylinder (124) and a chain cover (121) in order from the front to the rear direction of a powerunit assembly (122). The cylinder (124) protrudes in a forward direction from the front-end portion.
[00041] Fig. 2 illustrates a perspective view of the backbone frame structure which is generally of a convex shape, where main tube (101b) extending rearwardly and downwardly from a head tube (101a) of the mono-tube type frame (101), further a down tube (101c) of the mono-tube type frame (101) extends rearward forming a substantial floorboard space for utility & step through, along a longitudinal axis (L-L’) of the vehicle (100) from a rear portion of the main tube (101b).
[00042] The powerunit (125) (as shown in Fig. 1) is a four-stroke air-cooled powerunit where the center portion of the powerunit is supported to the mono-tube type frame (101) via a front bracket (204), and the rear portion thereof is supported by the rear bracket (202). Further, both front bracket (204) and rear bracket (202) brackets are positioned on the lower portion of the down tube (101c) when viewed from the left or right side of the vehicle (100).
[00043] The cover member (118) is disposed adjacent to the down tube (101c) using attaching means. The attaching means includes two floor mounting brackets (201) attached to the down tube (101c) of the mono-tube type frame (101) to support the cover member (118).
[00044] Fig. 3 is an assembled view of the suspension assembly as per one embodiment of the present invention. Further, as per one embodiment of the present invention, the suspension assembly comprises the pair of forks (306, 307), each comprises an outer tube (303) and an inner tube (302) having two ends (302a, 302b), where one end (302b) slidably connected to at least one end of the outer tube (303). One end of the pair of forks (306, 307) is mounted to a wheel axle where the wheel axle is attached to the hollow projection (304) present on the axle bracket and another end of the pair of forks (306, 307) is attached to a bracket assembly (136, 137) (as shown in fig. 1). The bracket assembly is, for example, a lower bracket in scooter type vehicles and backbone frame type vehicles and motorcycles including both the lower mounting brackets (137) and the top mounting bracket (136) holding the handlebar assembly (126). An elastic member is disposed inside the inner tube. Further, a first cylindrical member and a second cylindrical member are disposed inside the outer tube (303) and the inner tube (302) respectively. The outer tube (303) is connected to the wheel axle (304) and the inner tube (302) is connected to the handlebar assembly (126).
[00045] Further, as per one embodiment of the present invention, the inner tube (302) of the suspension assembly (130) is fastened by the bolt cap member assembly (301a) and top face of the bolt cap member assembly (301a) is covered by the top nut (305), to secure rigid attachment of the suspension assembly with the handle bar assembly.
[00046] Fig. 4 is a top view of the bolt cap member (301) as per one embodiment of the present invention. Further, as per one embodiment of the present invention, the bolt cap member (301) includes two portions namely lower portion (405) and upper portion (404). As per one embodiment of the present invention, the lower portion (405) includes the threaded portion (402) which conforms with the threaded portion profile of the inner tube (302) of suspension assembly (130), ensuring the interlocking of inner tube (302) with the bolt cap member (301). Further, as per one embodiment of the present invention, the bolt cap member (301) has the hollow portion having threaded member (402a) and the upper portion (404) of bolt cap member (301) includes the flat surface (403) and depressed portion termed as groove (401), where a stud member (406) having threaded portion (407) on the either side (408, 409) (as shown in fig. 4b), is detachably attached to the hollow portion having threaded member (402a) in the lower portion (405) of the bolt cap member (301) (as shown in fig. 4a). Further, as per one embodiment of the present invention, the outer diameter D of the groove (401) present on the bolt cap member is in between the range of 10-15mm. More than 10-15mm will reduced the flat land surface (403), which if reduced adversely affects the secure placing of top mounting bracket on the flat land surface of the bolt cap member. Less than 10-15mm will reduced the load bearing capacity of the stud member, which can potentially lead to breakage etc.
[00047] Further, as per one embodiment of the present invention, the bolt cap member (301) has the flat land portions (400a, 400b) which enables the ease of engagement of tooling, thereby saving time during servicing of the vehicle.
[00048] Fig. 4c is a sectional view of the bolt cap member assembly (301a) having threading and one side of stud member detachably attached to it, as per one embodiment of the present invention. Further, as per one embodiment of the present invention, the lower portion (405) of the bolt cap member (301) has threaded portion (402a) inside it. Further, the one side (409) of the stud member (406) having threaded portion (407) is interlocked with the threaded portion (402a) present in the hollow portion in lower portion (405) of bolt cap member (301), which ensures rigid mounting of one side (409) of the stud member (406) with the bolt cap member (301). Further, as per one embodiment of the present invention, the lower portion (405) of the bolt cap member has an additional circumferential groove portion (410) which accommodates sealing member that is typically a rubber seal, to ensure the sealing and restrict the leakage of the oil from the inner tube of the suspension assembly.
[00049] Fig. 5 is a sectional view of the stud member with the top mounting bracket as per one embodiment of the present invention. Further, as per one embodiment of the present invention, another side (408) of the stud member (406) having a threaded portion (407) acts as a guiding member for the top mounting bracket (136) of the step through vehicle (100), where the another side (408) of stud member (406) is projected through the opening (504) provided in said top mounting bracket (136) (as shown in fig. 5a). Further, the top mounting bracket (136) of the step through vehicle (100) is accommodated on the flat surface (403) of the upper portion (404) of bolt cap member (301) where the bolt cap member (301) is attached to the inner tube (302), which ensures rigid attachment of inner tube. As per an embodiment, the top face (501) of the stud member (406) is covered & fastened by the top nut (305) and a washer (503), ensuring rigid attachment of the another side of stud member with the handle bar assembly (126), which ultimately ensures the rigid mounting of the suspension assembly with the handle bar assembly of the step through vehicle. Further, when the top mounting bracket (136) abuts on flat surface (403) by tightening of top nut to the stud member (406), it exerts load/torque on the upper portion (404) of the bolt nut member (301) (as shown in fig. 5a). The presence of inner grooves (401) on the upper portion (404) of the bolt cap member (301), protects the end of the stud member from early or undesirable breaking during torque tightening or assembly operation, thereby enabling ease of assembly, reducing takt time and reducing probability of failure of components (as shown in fig. 6). The thread free shank portion of the stud (406) engages with the inner groove portion (401) of the bolt cap (301) to transfer the tightening torque to the stud assembly without any premature failure or breakage of any of the parts of the system.
[00050] The invention helps in overcoming the problem of restriction of assembly of components while ensuring that no additional part is used and no change in the layout of the vehicle.
[00051] Advantageously, the embodiments of the present invention, describes the potential improvements in the assembly of the suspension assembly where the stud member is detachably attached with the bolt cap member. This facilitates the simple and easy assembly of the suspension assembly to the handle bar assembly while also, providing the strength and support to the top mounting bracket of the handle bar assembly which efficiently enabling a rigid & strong assembly and also, acting as the guiding member for the top mounting bracket.
[00052] Many other improvements and modifications like using different elastic means having stiffness may be incorporated herein without deviating from the scope of the invention.

List of reference symbol:
Fig. 1:
100: Step Through Vehicle.
126: Handle Bar Assembly
119: Instrument Cluster
127: Head Lamp
111: Front Side Indicator
104: Daytime Running Lamp
112: A leg Shield
131: A front Fender
129: Front Wheel
130: Suspension
113: Brake Lever
103: Fuel Tank
114: Fuel cap
118: Cover Member
123: Cylinder Head
124: Cylinder
122: Power unit Assembly
125: Power unit
132 (132a, 132b): Seat Assembly
101: Mono tube frame
109: Grab Rail
106: Tail Lamp
105: License Plate
102: Rear Side Indicator
128: Rear Fender
116: Reflector
135: Rear Suspension
133: Rear Wheel
134: Swing Arm
121: Chain Cover
120: Center Stand
110: Tool Box
C-C’: Cylinder Axis
136: Top Mounting Bracket
137: Lower Mounting Bracket
Fig. 2:
101: Mono Tube Type Frame
101a: Head Tube
101b: Main Tube
101c: Down tube
201: Floor Mounting Brackets
202: Rear Bracket
204: Front Bracket
Fig. 3:
301a: Bolt cap member Assembly
301: Bolt cap member
302: Inner Tube
302a, 302b: Ends of Inner Tube
303: Outer Tube
304: Wheel Axle
305: Top bolt
306, 307: Pair of Front Forks
Fig. 4:
400a, 400b: Flat Land Portion
401: Groove
402: Threading
402a: Internal threading
403: Flat surface
404: Upper Portion
405: Lower Portion
Fig. 4a:
406: Stud member
Fig. 4b
407: Threading
408: Another Side
409: One side
Fig. 4c:
410: Portion for Rubber Sealing
Fig. 5:
501: Top Face of stud member
503: Washer.