DESC:TECHNICAL FIELD
[0001] The present subject matter relates generally to a two-wheeled vehicle and a three-wheeled saddle type vehicle. More particularly but not exclusively, the present invention relates to a suspension assembly for the two-wheeled vehicle.
BACKGROUND
[0002] Typically, vehicle layout design for a underbone 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 front suspension assembly and smaller wheels requires a suspension assembly of the 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 underbone frame type vehicle.
BRIEF DESCRIPTION OF THE DRAWINGS
[0003] The detailed description is given with reference to the accompanying figures. The same numbers are used throughout the drawings to reference like features and components.
[0004] Fig. 1 shows a side view of the straddle type vehicle.
[0005] Fig. 2 illustrates a typical suspension assembly of a two-wheeled vehicle according to an embodiment.
[0006] Fig. 3 illustrates a sectional view of a fork of a pair of front forks of the suspension assembly of a two-wheeled vehicle.
[0007] Fig. 4 illustrates a portion of a sectional view of the second cylindrical member disposed inside the inner tube.
[0008] Fig. 5 illustrates a portion of a sectional view of a top portion of the second cylindrical member disposed inside the inner tube.
[0009] Fig. 6 illustrates a portion of a sectional view of a portion of a first cylindrical member disposed inside the outer tube of the suspension assembly of the two-wheeled vehicle.
[00010] Fig. 7 illustrates a perspective of a second cylindrical member according to an embodiment of the present invention.
[00011] Fig. 8 illustrates a perspective view of a head portion of the second cylindrical member.
[00012] Fig. 9 illustrates a perspective view of a washer member according to an embodiment of the present invention.
[00013] Fig. 10 illustrates a front view of a suspension assembly according to another embodiment of the present invention.
[00014] Fig. 11 illustrates a fork of a pair of forks of as suspension assembly according to an embodiment of the present invention.
[00015] Fig. 12 illustrates a detailed view of a portion of the fork as illustrated in Fig. 11.
[00016] Fig. 13 illustrates a detailed view of a portion of the stopping mechanism.
DETAILED DESCRIPTION
[00017] Typically, a front suspension assembly provides comfort to the rider in a two-wheeled vehicle by isolating the vehicle from any external disturbances that occur due to irregularities on the road from reaching the rider. The elastic member and the damping fluid present inside the front suspension assembly govern the performance of the front suspension assembly and also maintain the stability of the two-wheeled vehicle.
[00018] Typically, a conventional front suspension assembly comprises an inner tube slidably connected to an outer tube. The inner tube of the front suspension assembly is mounted to the handle bar assembly and the outer tube is mounted to an axle of a front wheel. 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 front 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 front 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.
[00019] Further, typically, the telescopic type of small suspension assembly used in the saddle type 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 design, space available for the compression spring and the quantity of oil filled inside the suspension assembly.
[00020] The load carrying capacity of the suspension assembly can be increased by increasing any of the following characteristics, including, the length of the spring, the wire diameter, and pitch that has consequential impact on the length and outer diameter of the spring. The compression spring always gets back to its non-compressed state when released from its compressed state. Whenever, the compressed spring is disposed inside the inner tube of the front suspension assembly, the compression spring gets accommodated inside the inner tube by pushing the inner tube to its maximum length. Under such a condition of compression, the spring is expanded to its maximum length, the required preload cannot be achieved in the front suspension assembly. However, the required preload can be provided in the front suspension assembly by restricting the movement of inner tube with respect to the expanding compression spring.
[00021] Furthermore, the conventional suspension assembly, for example, particularly suspension assembly made of steel or the like, comprises welded joints at an upper end and a lower end. The welded joints do not provide the flexibility to service the inside portion of the front suspension assembly. Hence, it is difficult to service the front suspension assembly.
[00022] Depending upon the vehicle ride requirements and the stability required to the vehicle, the front suspension assembly can be accordingly designed. The front suspension assembly may include a pair of front forks including damping fluid, and a preloaded elastic member disposed inside the outer tube.
[00023] The front suspension assembly capable of achieving required damping response for better ride comfort and vehicle handling is required. Conventional front suspension assembly has the compression and extension of the front fork assembly restricted by physical abutment of a sliding member against a stopper member. For such systems, there exists freedom to provide free load on the elastic member as well as tune performance of the vehicle. Such systems are expensive. However, for a low-cost fork system using the elastic member to limit the stroke of the system in either compression or extension is a challenging task. The elastic member tends to break leading to poor durability and limited freedom for performance tuning. This, there exists a problem of achieving good performance tunable fork system at low cost with minimum number of parts and better durability and reliability.
[00024] According to an embodiment of the present invention, the suspension assembly for a vehicle comprises a pair of front forks. The pair of front forks each comprises an outer tube and an inner tube slidably connected to at least one end of the outer tube. One end of the pair of front forks is mounted to a wheel axle and another end of the pair of front forks is attached to a bracket assembly. The bracket assembly is, for example, a lower bracket in scooter type vehicles and underbone frame type vehicles and motorcycles including both the lower brackets and the upper brackets holding the handlebar assembly. 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 and the inner tube respectively. The outer tube is connected to the wheel axle and the inner tube is connected to the handlebar assembly. The first cylindrical member disposed inside the outer tube comprises a rod portion and a head portion. The rod portion comprises a first end capable of being detachably attachable to the outer tube. The rod portion further comprises a second end configured to be accommodated by the head portion. The head portion of the first cylindrical member is configured to receive the elastic member disposed inside the inner tube. The elastic member is substantially supported by the head portion of the first cylindrical member.
[00025] According to another embodiment of the present invention, the outer tube is connected to the handlebar assembly and the inner tube is connected to the wheel axle.
[00026] Furthermore, in assembled condition of the front suspension assembly, the elastic member is compressed. The compressed elastic member provides a pre-compression to the front fork assembly. The pre-compression of the front fork assembly is achieved by pressing the elastic member with a second cylindrical member against a first cylindrical member. According to an embodiment, the elastic member is disposed between a first cylindrical member and a second cylindrical member. The second cylindrical member comprises a substantially flat portion that is pressed against another end of the elastic member. Thereby, a pre-compressed state of the elastic member inside the inner tube is achieved.
[00027] According to another embodiment of the present invention, the head portion of the first cylindrical member comprises a washer member with a hole to accommodate the second end of the rod portion. The head portion is fixedly attached, for example, is welded to the second end of the rod portion.
[00028] According to another embodiment of the present invention, the substantially flat portion of the second cylindrical member is enclosing a provision. The provision is configured to receive at least an end portion of the second cylindrical member.
[00029] According to another embodiment of the present invention, the second cylindrical member comprises a second end. The second end of the second cylindrical member is inserted into a locking mechanism. The locking mechanism comprises a stopper with a through hole. The stopper is grooved on an outer circumferential surface. The groove on the outer circumferential surface accommodates a snap ring. The through hole of the stopper is configured to receive the second end of the second cylindrical member.
[00030] Furthermore, according to yet another embodiment of the present invention, the head portion of the first cylindrical member comprises a face configured to accommodate an absorbent member. The absorbent member further includes another end configured to be seated on another circular member. The circular member is fixedly attached to an inner surface of the inner tube of the front suspension assembly.
[0001] Fig. 1 illustrates a left side view of an exemplary two-wheeled type-through type vehicle, in accordance with an embodiment of present subject matter. The vehicle 100 has a frame assembly 105, which acts as the skeleton for bearing the loads. A handle bar assembly 115 is pivotally disposed through a head tube 105A. The handle bar assembly 115 is connected to a front wheel 101 by one or more front suspension(s) 110. A front fender 125 is disposed above the front wheel 101 for covering at least a portion of the front wheel 101. A fuel tank 130 is mounted to the main tube 105A of the frame assembly 105 and it is disposed in the front portion F of a step-through space of the frame assembly 105. The power unit 135 is mounted to the down tube (not shown in figure). In the present embodiment, the power unit 135 is an IC engine. Hereinafter, the terms IC engine and the power unit are interchangeably used. In another embodiment, the power unit 135 includes an electric motor that acts as a traction motor. The fuel tank 130 is functionally connected to the power unit 135. In an embodiment, a piston axis of the engine is horizontal i.e. parallel to a longitudinal axis of the vehicle 100. A swing arm 140 is swingably connected to the frame assembly 105. A rear wheel 145 is rotatably supported by the swing arm 140. One or more rear suspension(s) 150, which are connecting the swing arm 140 at an angle, to sustain both the radial and axial forces occurring due to wheel reaction, to the frame assembly 105. A rear fender 155 is disposed above the rear wheel 145. A seat assembly 160A, 160B is disposed at a rear portion R of the step-through space. In an embodiment, the seat assembly 160 includes a rider seat 160A, and a pillion seat 160B. Further, the seat assembly 160A, 160B is positioned above the rear wheel 145. The vehicle is supported by a centre stand mounted to the frame assembly 105. A floorboard 165 is mounted above the down tube (not shown). The floorboard 165 covers at least a portion of the power unit 135.
[0002] The internal combustion (IC) engine of the power unit 135 includes, 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 IC engine. Power generated by IC engine is transferred to the rear wheel 145 through a transmission system (not shown).
[00031] Fig. 2 illustrates a typical suspension assembly of a two-wheeled vehicle according to an embodiment. The different parts present in the typical suspension assembly 110 include an outer tube 205, and an inner tube 202 slidably connected to the outer tube 205. A damping fluid actuates the inner tube 202. The suspension assembly 110 includes a pair of front forks comprising inner tube 202 which slides over the outer tube 205. The lower end of the outer tube 205 enables the mounting of wheel assembly and the other of the outer tube 205 provides provision for mounting of bush and oil seal. The upper end of the inner tube 202 is mounted to the handle bar assembly 111. The lower end of the inner tube 202 is mounted by slider which guides the sliding motion of the inner tube 202 on the outer tube 205. The sliding motion of inner tube 202 is also guided by the bush which is mounted on the outer tube 205. The pair of front fork does not contain damper and hence the performance of the pair of front fork is governed by the characteristics of an elastic member which is disposed inside the inner tube. One end 117 of the outer tube 205 is attached to the front wheel 101 and the other end 118 of the inner tube 202 is attached to the handlebar assembly 111. In particular, the one end 117 is attached to an axle of the front wheel 101 and the other end 118 of the inner tube 202 is attached to an upper bracket.
[00032] However, according to another embodiment of the present invention, the pair of front forks contain damper.
[00033] Fig. 3 illustrates a sectional view of a fork of a pair of front forks of the suspension assembly of a two-wheeled vehicle. According to an embodiment of the present invention, the front fork comprises of the outer tube 205 configured to accommodate a first cylindrical member 203 there within. Further, the inner tube 202 is configured to accommodate an elastic member 201 seated upon the first cylindrical member 203. Furthermore, the inner tube 202 comprises a second cylindrical member 204 there within. Furthermore, the outer tube 205 is configured to accommodate an absorbent member 206. The absorbent member 206 prevents the sudden decompression of the elastic member 201 during an extension stroke of the suspension assembly. To minimize the number of parts, in an embodiment, the length of the first cylindrical member 203 is substantially similar to the length of the second cylindrical member 204. As per another aspect of the present invention, the first cylindrical member 203 and the second cylindrical member 204 are identical. Further, the first cylindrical member 203 comprises a cylindrical elongated member 203a and a head portion 203b. An elongated member first end 203aa of the cylindrical elongated member 203a is detachably attached to the outer tube 205.
[00034] According to an embodiment of the present invention, the elastic member 201 is in compressed state in an assembled condition. The compressed state of the elastic member 201 inside the inner tube 202 is achieved by pressing the second cylindrical member 204 against the elastic member 201. The compressed elastic member 201 provides required preload to the front suspension assembly. The first cylindrical member 203 is disposed inside the outer tube 205 and is fixedly attached to one end 117 of the outer tube 205. According to another embodiment of the present invention, the first cylindrical member 203 is detachably attached to the one end 117 of the outer tube 205. Further, the second cylindrical member 204 is fixedly attached to the another end 118 of the inner tube 202. According to another embodiment of the present invention, the second cylindrical member 204 is detachably attached to the another end 118 of the inner tube 202.
[00035] The preloaded front suspension assembly according to the present invention has increased load carrying capacity. For example, since, the elastic member 201 is already compressed in the assembled state, the elastic member does not immediately undergo compression that may occur due to irregularities on the road. Furthermore, during journey of the vehicle on a speed breaker or into a pot hole, the elastic member 201 is able to withstand the impact due to such irregularities and further, extreme end de-compression, which occurs during the complete rebound stroke, is prevented by the absorbent member 206. Therefore, the ride feel of the vehicle is improved due to preloaded suspension assembly and further, the immediate transfer of vibrations to the handlebar assembly and subsequently to the rider due to irregularities on the road is also reduced to a considerable extent.
[00036] Fig. 4 illustrates a portion of a sectional view of the second cylindrical member disposed inside the inner tube. The second cylindrical member 204 comprises a rod portion 204c, one end of which is fixedly attached to a flat portion 204a. The flat portion 204a comprises a provision 204b to accommodate a first end 204ca of the rod portion 204c. Further, the flat portion 204a is pressed against a farther end 201b the elastic member 201 to keep the elastic member 201 in the compressed state during assembly of the suspension assembly. In particular, the first end 204ca of the rod portion 204c is welded to the provision 204b of the flat portion 204a. According to another embodiment, the rod portion 204c is fastened by other means to the provision 204b.
[00037] Fig. 5 illustrates a portion of a sectional view of a top portion of the second cylindrical member disposed inside the inner tube. The rod portion 204c of the second cylindrical member 204 comprises a second end 204cb attached to the another end 118 of the inner tube 202. The another end 204cb protrudes through and is facilitated to pass through a locking mechanism 207 including a first washer member 207a comprising a grooved outer circumferential surface. The grooved circumferential surface 207d capable of accommodating a snap ring 207b. Furthermore, the first washer member 207a comprises a through hole 207c to allow the rod portion 204 to pass through.
[00038] Fig. 6 illustrates a detailed view of a sectional view of a portion of a first cylindrical member disposed inside the outer tube of the suspension assembly of the two-wheeled vehicle. The first cylindrical member 203 comprises a cylindrical elongated member 203a fixedly attached to a head portion 203b. The head portion 203b comprises a central slot 203as capable of receiving a cylinder second end 203ab of the cylindrical elongated member 203a. The elastic member 201 comprises one end 201a which is seated on the head portion 203b of the first cylindrical member 203. Furthermore, a circular member 208 is disposed at a lower end of the inner tube 205 and is disposed below the head portion 203b of the first cylindrical member 203. Furthermore, the absorbent member 206 is disposed in between the head portion 203b and the circular member 208. The first cylindrical member 203 comprises a face 302 capable of accommodating one end 303 of the absorber member 206 comprising another end 304 being seated by the circular member 208. The absorbent member 206 prevents sudden expansion that occurs during the rebound stroke, of the elastic member 201 during the extension stroke of the suspension assembly.
[00039] Furthermore, according to an embodiment of the present invention, the circular member 208 is fixedly attached to at least a portion of an inner surface of the inner tube (not shown). During the extension stroke of the suspension assembly, the fixedly attached circular member 208 prevents the first cylindrical member 203 from slipping out. The head portion 203b is restricted from moving downwards by the circular member 208.
[00040] Fig. 7 illustrates a perspective of a second cylindrical member according to an embodiment of the present invention. The second cylindrical member 204 comprises the rod portion 204c, one end of which is fixedly attached, for example, welded to the provision 204b in the flat portion 204a. The head portion comprises an outer surface which is irregular in shape. The outer surface comprises of one or more grooves.
[00041] Fig. 8 illustrates a perspective view of a head portion of the second cylindrical member. The flat portion 204a comprises the provision 204b configured to receive at least a portion of one end of the rod portion. The provision 204b is accommodated by an irregular shaped flat portion 204a. The outer surface of the flat portion 204a comprises one or more grooves 204d.
[00042] Fig. 9 illustrates a perspective view of a washer member according to an embodiment of the present invention. The second washer member 208 for example is circular in shape and comprises the provision 208a.
[00043] Fig. 10 illustrates a sectional view of a suspension assembly according to another embodiment of the present invention. The suspension assembly includes a second elastic member 502 disposed co-axially to the elastic member 201. The second elastic member 502 provides stiffness in addition to the stiffness provided by the elastic member 201.
[00044] According to another embodiment of the present invention, a seating member 502a is disposed on an upper end portion 205Up of the outer tube 205. The seating member 502a supports at least a portion of the second elastic member 502. Further, a guide member 502b is disposed on the inner tube 202, such that the guide member 502b covers at least a portion of the circumference of the inner tube 202. The guide member 502b ensures proper functioning of the second elastic member 502 by guiding the second elastic member 502 on the inner tube 202.
[00045] Furthermore, according to another embodiment of the present invention, the second elastic member 502 is covered by a substantially rigid covering member 501 disposed on the inner tube 202 and capable of enclosing the second elastic member 502 there within. Furthermore, the covering member also prevents entry of dust, mud, water and other foreign particles from entering into the second elastic member 502, the surrounding areas, and also to the inside of the internal parts of the suspension assembly.
[00046] Fig. 11 illustrates a fork of a pair of forks of as suspension assembly according to an embodiment of the present invention. The elastic member 201 is pre-compressed in the assembled state. The elastic member 201, by virtue of its nature tends to retain to its non-compressed state by pushing the inner tube 202 to the length of the fork. The elastic member 201 is prevented from reaching its non-compressed state and separating from the outer tube 205 by providing a stopping mechanism 601 disposed on an outer circumferential surface of the inner tube 202. Furthermore, the outer tube 205 and the cylindrical member 204 have another co-axial cylindrical member placed at a bottom side. The outer diameter of this member is such that it enables the inner tube 202 including the second washer member 208 to unrestrictedly move over each other during stroking, in particular, during complete compression stroke.
[00047] Fig. 12 illustrates a detailed view of a portion of the fork as illustrated in Fig. 11. The stopping mechanism 601 includes a sealing member 601b and a ring member 601a. Both the sealing member 601b and the ring member 601a are disposed abuttingly to the outer circumferential surface of the inner tube 202. At least one bush member 202a is disposed on an upper portion and inside the outer tube, such that it is abutting against the inner circumferential surface of the outer tube 205. The at least one bush member 202a guides the movement of the inner tube 202 upon the outer tube 205.
[00048] Fig. 13 illustrates a detailed view of a portion of the stopping mechanism. The at least bush member 202a includes at least an inner circumferential portion that is disposed away from the outer circumferential surface of the inner tube, in order to define a gap 602 therebetween. The gap 602 so formed is having a varying cross-section, for example, like a wedge. After providing pre-compression to the elastic member 201, the stopping mechanism 601 tends to slide inside the gap 602. The stopping mechanism 601 slides inside the gap 602 only for a certain extend and the further sliding is restricted. Thereby, restricting the elastic member from attaining its non-compressed state and separating from the outer tube 205. Therefore, achieving a pre-compressed assembly state of the suspension assembly.
[00049] Although the subject matter has been described in considerable detail with reference to certain embodiments thereof, other embodiments are possible. It is to be understood that the aspects of the embodiments are not necessarily limited to the features described herein.
,CLAIMS:I/We Claim:
1. A suspension assembly (110) for a straddle type motorcycle (100), said suspension assembly (110) comprising:
an outer tube (205);
an inner tube (202) slidably connected to one end of said outer tube (205); and
a first cylindrical member (203) comprising a cylindrical elongated member (203a) and a head portion (203b), a elongated member first end (203aa) of said cylindrical elongated member (203a) is detachably attached to said outer tube (205) and a cylinder second end (203ab) of said cylindrical elongated member (203a) is accommodated by said head portion (203b), said head portion (203b) is configured to receive one end (201a) of an elastic member (201) disposed inside said inner tube (202),
wherein,
said inner tube (202) includes a second cylindrical member (204) disposed there within, said second cylindrical member (204) is configured to enable a predetermined compressed state of said elastic member (201) in an assembled condition.
2. The suspension assembly (110) for a straddle type motorcycle (100) as claimed in claim 1, wherein said second cylindrical member (204) is a rod like structure.
3. The suspension assembly (110) for a straddle type motorcycle (100) as claimed in claim 1, wherein said first cylindrical member (203) includes a length substantially similar to length of the second cylindrical member (204).
4. The suspension assembly (110) for a straddle type motorcycle (100) as claimed in claim 1, wherein said second cylindrical member (204) includes a flat portion (204a) pressed against a farther end (201b) of the elastic member (201).
5. The suspension assembly (110) for a straddle type motorcycle (100) as claimed in claim 1, wherein said second cylindrical member (204) includes a rod portion (204c) comprising a second end (204cb) attached to another end (118) of the inner tube (202).
6. The suspension assembly (110) for a straddle type motorcycle (100) as claimed in claim 1, wherein said head portion (203b) comprises a washer (301) with a central slot (203as) to accommodate said rod second end (103ab) of said cylindrical elongated (203a), said head portion (203b) is fixedly attached to said cylinder second end (203ab) of said cylindrical elongated member (203a).
7. The suspension assembly (110) for a straddle type motorcycle (100) as claimed in claim 1, wherein said flat portion (204a) is enclosing a provision (204b) to receive a first end (204ca) of said second cylindrical member (204).
8. The suspension assembly (110) for a straddle type motorcycle (100) as claimed in claim 1, wherein said second cylindrical member (204) comprises a second end (204cb) capable of being accommodated by a locking mechanism (207) comprising a first washer member (207a) including a grooved outer circumferential surface (207d) and a through hole (207c), said grooved outer circumferential surface (207d) is capable of accommodating a snap ring (207b) and said through hole (207c) is configured to receive said second end (204cb) of said second cylindrical member (204).
9. The suspension assembly (110) for a straddle type motorcycle (100) as claimed in claim 1, wherein said head portion (203b) of said first cylindrical member (203) comprises a face (302) capable of accommodating one end (303) of an absorbent member (206) comprising another end (304) being seated by another circular member (208) fixedly attached to said inner tube (202) of said suspension assembly (110).
10. The suspension assembly (110) for a straddle type motorcycle (100) as claimed in claim 1, wherein at least a portion of said inner tube (202) is covered by a guide member (502b), said guide member (502b) includes a second elastic member (502) disposed co-axially to the elastic member (201).
11. The suspension assembly (110) for a straddle type motorcycle (100) as claimed in claim 1, wherein said inner tube (202) includes a stopping mechanism (601) disposed on an outer circumferential surface.
12. The suspension assembly (110) for a straddle type motorcycle (100) as claimed in claim 1 or claim 10, wherein said outer tube (205) includes an upper end portion (205Up) configured to support a seating member (502a), said seating member (502a) supports at least a portion of said second elastic member (502).
13. The suspension assembly (110) for a straddle type motorcycle (100) as claimed in claim 1 or claim 11, wherein said stopping mechanism (601) includes a sealing member (601b) and a ring member (601a), the sealing member (601b) and the ring member (601a) are disposed abuttingly to the outer circumferential surface of the inner tube (202), and at least one bush member (202a) is disposed on an upper portion and inside the outer tube, at least one bush member (202a) is abutting against the inner circumferential surface of the outer tube (205)
14. The suspension assembly (110) for a straddle type motorcycle (100) as claimed in claim 13, wherein said at least one bush member (202a) includes a gap (602) comprising a varying cross-section, said gap (602) is configured to receive said stopping mechanism (601) during a pre-compressed state.