WO2022101924A1

WO2022101924A1 - Air cleaner assembly

Info

Publication number: WO2022101924A1
Application number: PCT/IN2021/050313
Authority: WO
Inventors: Jayajothi Johnson Vethanayagam; Vaidheeswaran Ramesh; Harsha KOTHURU NARAYANA; Selvaraju Kalappan; Murugesan Manickam; Deepan Thangavel
Original assignee: Tvs Motor Company Limited
Priority date: 2020-11-16
Filing date: 2021-03-25
Publication date: 2022-05-19
Also published as: CN116457565A; CO2023005563A2; MX2023005682A

Abstract

The present invention relates to a two wheeled step through type vehicle (100), where said vehicle (100) comprises of a mono tube type frame (101), engine (125), cylinder head (123), cylinder (124), fuel tank (103), and air cleaner assembly (301). The air cleaner assembly is mounted on a main frame (101b) of the mono-tube type frame (101) and super imposed by the fuel tank (103). Further, the air cleaner assembly (301) includes two compartments, primary compartment (407) which contains the primary cleaner element (406) and secondary compartment (401) has a housing integrally attached on the secondary compartment in which the secondary cleaner element (403) is housed, thereby, ensures the reduction of number of components and hoses.

Description

AIR CLEANER ASSEMBLY

TECHNICAL FIELD

[0001] The present subject matter relates to a two wheeled type vehicle. More particularly, the present subject matter relates to the air cleaner assembly of a step through type two wheeled vehicles.

BACKGROUND

[0002] Step through type two wheeled vehicles are one of the most affordable and popular kind of the vehicle among the world’s population. These kinds of vehicles are mostly powered by two stroke or four stroke engines. Conventionally carburetor type system has been implemented in vehicles for supplying & metering fuel quantity to the engine powering such vehicles. With need to enhance performance, power output & efficiency of same engine as well as reduce emissions, fuel injection system has become popular in step through type vehicles. Thus, a fuel management system is implemented in vehicles to control the fuel being supplied to the engine at right time & in right quantity.

[0003] Often with vehicles being commercialized for use in multiple markets & variety of users, depending on the market needs, vehicle manufacturers face a challenge of handling variety of fuel supply system for given vehicle with variant of carburetor system vis-a-vis fuel injection system. The fuel management system of the internal combustion engine has to use the combination of fuel tank along with the fuel pump module to deliver fuel in the engine with the help of the fuel injector. The vehicle fuel system is responsible for delivering the right amount of fuel from the fuel tank to the fuel injector, to maintain an appropriate amount of fuel in the engine for the process of internal combustion.

[0004] With ever increasing number of vehicles used for personal transport and its contribution to the pollution of environment in terms of the emission, evaporative emissions also add to the pollution in terms of unburnt and burnt hydrocarbons. By very basic physical properties of gasoline fuels primarily used for transportation, evaporative emissions are bound to exist under normal environment conditions as well as at temperatures ranging from ambient temperatures to temperature encountered during various operating conditions. The gasoline fuel has propensity to vaporize at room temperatures within respective container and this emission needs to be purged to avoid undue pressure development in the container. Such emissions are often referred to as evaporative emissions. There is a constant drive from manufacturers to bring down the extent of emissions in the automotive sector.

BRIEF DESCRIPTION OF THE DRAWINGS

[0005] The detailed description is described with reference to an embodiment in a type step thru type two wheeled vehicle along with the accompanying figures. The same numbers are used throughout the drawings to reference like features and components.

[0006] Fig.l is a side view of a step through type vehicle as per one embodiment of the present invention.

[0007] Fig.2 is a perspective view of a frame of step through type vehicle as per one embodiment of the present invention.

[0008] Fig.3 is a side view of the step through type vehicle with air cleaner assembly as per one embodiment of the present invention.

[0009] Fig. 3a is an assembled view of the air cleaner assembly and fuel tank as per one embodiment of the present invention.

[00010] Fig. 4 is an exploded view of the air cleaner assembly as per one embodiment of the present invention.

[00011] Fig. 4a is a sectional view of the secondary compartment as per one embodiment of the present invention.

[00012] Fig. 4b is an assembled view of the air cleaner assembly showing breathing process as per one embodiment of the present invention.

[00013] Fig. 4c is an assembled view of the air cleaner assembly showing purging process as per one embodiment of the present invention.

[00014] Fig, 5 is a perspective view of the air cleaner assembly as per another embodiment of the present invention.

DETAILED DESCRIPTION

[00015] The conventional carburetor fuel systems lack in several major aspects e.g. poor efficiency in terms of fuel consumption and performance of the engine. Also, it is majorly responsible for the emission of harmful gases which are the main cause for polluting the environment.

[00016] In order to address the shortcomings of the conventional carburetor system, an Electronic Fuel Injection System or EFI was developed as an improvement over the carburetor in order to calibrate and optimize the fuel/air ratio. The electronic fuel injection system or EFI is utilized to better control fuel to air ratios in order to provide better performance, improve emissions and drivability. Moreover, the need of precise fuel supply creates a necessity for introduction of Electronic Fuel Injection (EFI) system in existing carburetor vehicles.

[00017] Typically, the electronic fuel injection system comprises a fuel tank, a fuel pump that is operatively coupled to the fuel tank that directs fuel into the engine. Further, as an improvement over the carburetor, the Electronic Fuel Injection system (EFI) utilizes advanced electronic techniques to adjust the air fuel mixture to reduce the evaporative emission in the environment.

[00018] Also, in recent times, for reducing the evaporative emission in the environment, the evaporative fuel recycle systems are designed to store and dispose of the fuel vapors before they can escape into the atmosphere, A typical system consists of a canister full of charcoal, valves, hoses, vents in the fuel lines and a sealed fuel tank cap. When fuel evaporates inside the fuel tank, the excess vapors are transferred to the canister. They are stored there until they can safely be transferred back to the engine to be burnt with the normal air-fuel mixture.

[00019] Ideally, the fuel system should be completely closed to prevent any vapor escape, but as it is evident form the fact that under extreme conditions like heat and cold which affects the pressure inside the fuel tank and fuel tank head space, there arises a need for venting and vacuum pressure relief functions to limit the positive and negative pressure inside the fuel tank respectively. As fuel is consumed by combustion chamber inside the engine, therefore during introduction of fuel into combustion chamber air is introduced inside the headspace of the fuel tank to limit the magnitude of negative tank pressure. Generally such venting and vacuum relief functions are performed through valves. [00020] The step through type vehicles typically have a canister as a component of evaporative fuel recycle system which adsorbs the hydrocarbon vapors from the fuel tank and supplies evaporated fuel to the engine for combustion which is positioned near to engine

[00021] Typically step through type vehicles have an evaporative fuel recycle system which comprises of a canister, roll over valve, purge valve and other connecting elements to connect from engine to fuel tank. Here, canister is a small round or rectangular plastic or steel container mounted in the vehicle. It is usually disposed such that it is hidden from view and may be located in a corner of the engine wall structure or inside a side panel. The canister is generally filled with activated charcoal. The charcoal acts like a sponge and adsorbs and stores fuel vapors. The vapors are stored in the canister until the engine is started, gets warmed-up and is being driven. The purge control valve when open, it allows intake vacuum to siphon the fuel vapors into the engine. The canister is connected to the fuel tank via the hoses.

[00022] Further, under normal circumstances, the evaporative fuel recycle system having canister causes few problems. The most common problems with the evaporative fuel recycles system having canister is a faulty purge control, undesirable increase in hose length, pinching of hose pipe, inaccurate orientation of roll over valve, water entry etc.

[00023] Typically, manufacturers look for implementing a canister system to address these emissions to the extent feasible. Bigger the size of the canister, the higher the emissions can be adsorbed. Such canister solutions bring with them additional components like hoses, valves etc. which need to be packaged in the same vehicle without compromising on the size of the vehicle as well as minimize cost impact. Therefore, there exists a continuous challenge for automotive manufacturers to address the evaporative emissions as well as avoid discharge of the same into the atmosphere within minimum space / size of the vehicle as well as at a reduced cost and weight impact. Further, the challenge is particularly significant for a step through vehicle where impact on compactness, weight & cost become critical.

[00024] For the vehicle having compact layout, the disposition of the canister on the side frame is complex and difficult due to lack of space, also the serviceability and accessibility of the canister gets restricted since one has to remove multiple components for servicing which adversely increase the servicing time. Further, such disposition results in change in design or change in location of neighboring parts in the compact layout, thereby increasing vehicle size, incurring high cost, increase in lead time for change over as well as more variety of parts.

[00025] Typically, in known art, canister is installed to the frame with rubber cushion; hence it requires an attaching member & additional assembly process which may be troublesome during installation within the limited space & complex fuel piping. Further, as per another known art, the canister assembly is installed along with the air cleaner as an integrated part of the air cleaner where it requires a dedicated attaching member which leads to increased assembly time, space constraints etc.

[00026] In another known art, a canister is installed to the frame with rubber cushion. A purge control valve is eliminated and a purge port is provided in the air cleaner assembly with certain compromise. This leads to problem of additional attaching member & additional assembly process which may be troublesome during installation within the limited space & complex fuel piping. Also, this leads to elongated length of hoses, which may lead to breakage or pinching of the hoses.

[00027] Hence, there exists a challenge of designing an efficient an efficient evaporative fuel recycle system, which can satisfactorily accommodate all essential elements to ensure less emission rate in step through type vehicles without any major change in design and manufacturing set-up of the compact vehicle. In this regard, there is a need of improved designing of air cleaner assembly having primary and secondary air cleaner element, which can satisfactorily accommodate all essential elements to ensure less emission rate in step through type vehicles without any major change in design and manufacturing set-up of the compact vehicle

[00028] Therefore, there is a need to have an improved mounting of the air cleaner assembly having primary and secondary air cleaner element which overcomes all of the above problems and other problems of known art.

[00029] The present invention provides a solution to the above problems while additionally also meeting the requirements of minimum modifications in vehicle when fuel supply system is changed from a carburetor system to fuel injection system. The objective is to be achieved at low cost with ease of manufacturing etc.

[00030] With the above objectives in view, the present invention relates to the electronically controlled fuel injection system and more particularly to the improved mounting of air cleaner assembly where the air cleaner assembly having compartments viz. primary compartment and secondary compartment configured with secondary air cleaner element.

[00031] As per one aspect of the present invention, a frame of the step through type vehicle comprises of a main frame, down frame etc., wherein a horizontal portion of the main frame is provided with an engine mounting bracket to mount the engine thereby ensuring rigid mounting of the engine below the horizontally extending downward portion of the main frame. A cylinder head is disposed in front of a crankcase. A fuel tank is disposed at a slightly tilted position on the main frame and the air cleaner assembly is disposed on the main frame and superimposed by the fuel tank.

[00032] As per one aspect of the present invention, fuel hose has two ends wherein one end is connected to the fuel tank and another end is connected to a roll over valve (ROV) and the hose is rigidly attached by a hose clip, to avoid any breakage of the hose. Further, as per one aspect of the present invention, another end of roll over valve has a hose termed as ROV hose which is further connected to the air cleaner assembly.

[00033] Further, as per one aspect of the present invention, the air cleaner assembly is divided into two compartments namely primary compartment and secondary compartment, where the primary compartment formed by a primary wall structure and is equipped with clean mixture of fuel vapor and atmospheric air, channelized to further flow through the secondary compartment formed by a secondary wall structure and finally channelized to flow to the engine at intake stage. The profile of the primary wall structure conforms with a profile of the secondary wall structure to make air cleaner assembly a close structure. The primary compartment and the secondary compartment of the air cleaner assembly are divided by a partition wall. The partition wall includes a primary filter element to filter out the atmospheric air before it is received in the secondary wall structure through an air inlet port thereby ensuring supply of clean air in the engine at intake stage. [00034] Further, as per one aspect of the present invention, the secondary wall structure forming the secondary compartment has two regions viz. An inner region which forms the secondary compartment when the secondary wall structure is assembled and an outer region. The outer region of the secondary wall structure has the air inlet port which channelizes the atmospheric air into the inner region of the secondary wall structure. The exterior surface of the secondary wall structure referred as the outer region of the air cleaner assembly has at least a relief which facilitates ease of mounting of the air cleaner assembly with the frame of the vehicle. A partially enclosed housing having cylindrical shape or substantially circular cross section shaped housing (referred here as “housing”) is integrally attached with the secondary wall structure. The housing includes a secondary cleaner element like foam, wet foam, charcoal, carbon, charred wood etc., to adsorb the fuel vapor, thereby achieving ease of accessibility of the secondary cleaner element during service. In another implementation, the housing is provided above air inlet port on the outer region of the secondary wall structure. The fuel vapor generated inside the fuel tank is channelized from the outlet of the fuel tank to the housing provided on the outer region of the secondary wall structure, passing through the hoses connected to the outlet fuel tank and roll over valve. Further, the channelized fuel vapor is mixed with the atmospheric air present in the secondary compartment and the mixture is channelized to the engine at the intake stage of the engine. The mixture of fuel vapor and atmospheric air ensures proper combustion in the engine, and this configuration ensures that the fuel vapors are not getting released in the atmosphere. The present invention also achieves reduction in the number of hoses without having any adverse impact on the working or performance of the air cleaner assembly and the engine. Furthermore, the housing provided on the outer region of the secondary wall structure is closed by a cover, ensuring that the secondary cleaner element is securely placed inside the housing. The outer region of the secondary wall structure also includes plurality of extended mounting means having openings to enable secured attachment of the air cleaner assembly with the frame of the vehicle.

[00035] As per another aspect of the present invention, the housing is provided in the inner region of the secondary wall structure of the air cleaner assembly, where the atmospheric air and the adsorbed fuel vapor is channelized to the primary wall structure of the air cleaner assembly. From primary wall structure of the air cleaner assembly, fresh air and adsorbed fuel vapor is further channelized to the engine at intake stage.

[00036] In the ensuing exemplary aspects, the vehicle is a step through vehicle. However, it is contemplated that the concepts of the present invention may be applied to any of the two wheeled vehicles and three wheeled vehicles without defeating the spirit of the invention.

[00037] 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.

[00038] Further “front” and “rear”, and “left” and “right” referred to in the ensuring description of the illustrated embodiment refer to front and rear, and left and right directions as seen in a state of being seated on a seat of the saddle type vehicle. Furthermore, a longitudinal axis refers to a front to rear axis relative to the vehicle, while a lateral axis refers to a side to side, or left to right axis relative to the vehicle. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. Further, the present subject matter can also be used in any two- wheeler, but for reference, the present subject matter is explained with respect to the step through type vehicle.

[00039] Fig. 1 is a left side view of an exemplary step through type vehicle, as per one embodiment of present subject matter. The vehicle (100) has a mono-tube type frame structure (101), which acts as a 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 (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 front suspension(s) (130). 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 a main frame member (101b) (as shown in Fig. 2) of the mono-tube type frame structure (101) and it is disposed in front portion F of a step-through space of the mono-tube type frame structure (101). The vehicle (100) having lighting means which includes Head lamp (127), Tail lamp (106), Turning indicators includes front side indicators (111) and rear side indicator (102) respectively and daytime running lamp (104). An engine (125) is mounted to the lower portion of the mono-tube type frame (101). In an embodiment, the engine (125) is an IC engine. An ignition coil (not shown), responsible for providing suitable voltage to a spark plug to ignite fuel, is mounted with a horn (not shown) on single bracket in the vehicle. The fuel tank (103) is functionally connected to the engine (125). In one implementation, an electronic purge control valve (not shown) is located inside inner portion of the fuel tank. In another implementation, an electronic purge control valve is located above a secondary air cleaner element (not shown).

[00040] In an embodiment, a cylinder axis (C-C’) is inclined upwardly and forwardly towards a front wheel of the vehicle (100). A swing arm (134) is swingably connected to the mono-tube type frame structure (101). A rear wheel (133) is rotatably supported by the swing arm (134). One or more rear suspension(s) (135) is connected 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 structure (101). A license plate (105) and reflector (116) are mounted on a rear fender (128) which is disposed above the rear wheel (133), where the license plate and a license plate lamp (not shown) is mounted by a single piece license plate bracket (not labelled). 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 the vehicle (100). A cover member (118) is mounted on in the step through region of the down tube (101c) (as shown in Fig. 2). The body side cover member (118) covers at least a portion of the engine (125) & step through region of the down tube (101c). [00041] The engine (125) includes an air intake system (not shown), where A fuel injector (not shown) is mounted on an intake port of the engine which minimizes the amount of unburnt fuel. In another implementation, an electronic fuel injection control system controls the fuel injector without a Temperature Manifold Absolute Pressure (TMAP) sensor, enabling elimination of components and overall cost reduction of the vehicle. A throttle position sensor along with a coupler is disposed at an angle to the ground and located on left hand side of the vehicle, below the air cleaner assembly and above the cylinder head of the engine. , The engine further includes 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 engine. Power generated by engine is transferred to the rear wheel (133) through a transmission system (not shown).

[00042] The engine (125) comprises a cylinder head (123), a cylinder (124), a crankcase (not shown) and a chain cover (121) in order from the front to the rear direction of an engine assembly (122). The cylinder (124) protrudes in a forward direction from the front end portion of the crankcase (503).

[00043] Fig. 2 is a perspective view of a frame structure which is generally of a convex shape, comprising of a main frame portion (101b) extending rearwardly and downwardly from a head tube (101a) of the mono-tube type frame structure (101). Further a down frame portion (101c) of the mono-tube type frame structure (101) extends rearward, along a longitudinal axis (L-L’) of the vehicle (100) from a rear portion of the main frame portion (101b). The fuel tank (103) (as shown in Fig. 1) is attached on the main frame portion (101b) through attaching means which includes at least one or more mounting brackets (203).

[00044] The engine (125) (as shown in Fig. 1) is a four-stroke air-cooled engine where the center portion of the engine is supported to the mono-tube type frame structure (101). The cover member (118) constitutes a floorboard which is disposed above the down frame portion (101c) using attaching means. The attaching means includes two cover frame mounting brackets (201) attached to the down frame portion (101c) of the monotube type frame structure (101) to support the floorboard cover member (118). Both the brackets (201) are placed parallel when viewed from top of the vehicle (100). [00045] Further, the main frame portion (101b) includes an engine mounting bracket (202) and a pair of cover frame mounting bracket (201) in the vehicle width direction, where the engine is mounted horizontally below the down tube portion (101c).

[00046] Fig. 3 is a side view of the step through type vehicle with an air cleaner assembly as per one embodiment of the present invention. As per one embodiment of the present invention, the air cleaner assembly (301) is attached to the main frame portion (101b) with different attachment means like one or more mounting brackets etc., and superimposed with respect to the fuel tank (103), when the step through vehicle is viewed from the rider’s seated position. As per an aspect of the present invention, the air cleaner assembly (301) is disposed in a substantially ‘U’ shaped channel formed on the forward side of the fuel tank (103) wherein the cavity encompasses the main frame portion (101b). Thus, the air cleaner assembly is securely disposed inside the cavity thereby being protected from accidental damage, environmental factors and provides good aesthetic appearance of the vehicle. As per the current aspect, this configuration enables to achieve compact layout and packaging for a backbone type saddle type vehicle. Further, as per one embodiment of the present invention, a roll over valve (302) having two ends, is accommodated in the bottom cavity portion of the fuel tank (103), where one end is attached to the fuel tank (103) and another end is attached to the air cleaner assembly (301) through one or more hoses. Further, as per one embodiment of the present invention, hose (309) has two ends (as shown in fig. 3a), wherein one end (309a) is connected to a vapor outlet (303) of the fuel tank (103) and another end (309b) is connected to the roll over valve (302). Further, through the hose (309), the fuel vapor generated in the fuel tank (103) is channelized to the roll over valve (302), from where the roll over valve (302) allows the fuel vapor to vent into the air cleaner assembly (301) through the hose (310), ensuring reduction of number and length of hoses and also, reduction of components for channelizing the fuel vapor and reaching the engine for combustion process while also achieving a compact layout of the fuel tank as well as the vehicle.

[00047] Fig. 4 is an exploded view of the air cleaner assembly as per one embodiment of the present invention. Further, as per one embodiment of the present invention, the air cleaner assembly (301) includes two compartments, primary compartment (401) and secondary compartment (404), where the primary compartment (401) is formed by primary wall structure (40 lw) and the secondary compartment (404) is formed by secondary wall structure (404w) which are detachably attached to each other with various attachment means like fasteners.. The primary compartment (401) contains clean mixture of fuel vapor and atmospheric air, channelized through the secondary compartment (404) and finally channelized through outlet port (402) to the engine at intake stage. The outer profile of the primary wall structure (40 lw) conforms with an outer profile of the secondary wall structure (404w) to make air cleaner assembly a close structure. The primary compartment (401) and the secondary compartment (404) of the air cleaner assembly are divided by a partition wall (403). The partition wall includes a primary filter element (not labeled) to filter out the atmospheric air received in the secondary wall structure which is received through an air inlet port (412) shown in Fig 4a thereby ensuring supply of clean air in the engine at intake stage.

[00048] As per one embodiment of the present invention, the secondary wall structure (404w) forming the secondary compartment (404) can be described to have two regions, an inner region (405) which forms the secondary compartment when the secondary wall structure (404w) is assembled and outer region (404a) (as shown in fig. 4a). The outer region (404a) of the secondary wall structure (404w) has the air inlet port (412) which channelizes the atmospheric air into the inner region (405) of the secondary wall structure (404). The exterior surface of the secondary wall structure (404w) referred as the outer region (404a) of the air cleaner assembly (301) has at least a relief (413) which facilitates ease of mounting of the air cleaner assembly (301) with the frame of the vehicle by eliminating any fouling of the air cleaner assembly with the frame during assembly. As per an aspect of the present invention, the secondary wall structure (404w) is configured with a partially enclosed housing or substantially circular cross section shaped housing (411) disposed closer to the ROV and is integrally formed with the secondary wall structure (404w). The circular cross section shaped housing or partially enclosed housing (411) having cylindrical shape (referred here as housing) is integrally attached on the outer region (404a) of the secondary wall structure (404w). As per an embodiment, the housing (411) in a substantially circular profile has a predetermined diameter D. As per an embodiment, the diameter D is in a predetermined range of 40mm to 60mm. Dimension more than or less than D leads to fouling of the housing with surrounding components or bulky design of the air cleaner assembly thereby adversely affecting compact vehicle layout. The housing (411) has a length L. As per an embodiment, the length L has a predetermined range of 60 mm to 80mm. Dimension more than or less than L leads to fouling of housing with surrounding components or bulky design of the air cleaner assembly thereby adversely affecting compact vehicle layout.

[00049] The housing (411) includes one or more secondary cleaner element like foam, wet foam, charcoal, carbon, charred wood, etc., to adsorb the fuel vapor thereby addressing evaporative emissions to a large extent. The design of the secondary cleaner structure as per the present embodiment enables achieving ease of accessibility of the secondary cleaner element during service even for a compact vehicle layout. In one implementation, the housing (411) is provided on a top end of the outer region (404a) of the secondary wall structure (404w). In another implementation, the housing (411) is configured above the air inlet port (412) on the outer region (404) of the secondary wall structure (404w). In another implementation, the air inlet port (412) is located at the air cleaner assembly such that air opening is formed at top side of secondary wall structure leading to increase in the length of air inlet port. The fuel vapor is channelized from the outlet of the fuel tank to the housing (411) provided on the outer region of the secondary wall structure (404w). Further, the channelized fuel vapor is mixed with the atmospheric air present in the secondary compartment and the mixture is channelized to the primary compartment through the partition wall (403) then to the engine at the intake stage of the engine, eliminating release of the fuel vapors in the atmosphere and also, ensuring reduction in the number of hoses without compromising the working or performance of the air cleaner assembly and the engine. Also, as the fuel vapors adsorbed by the one or more secondary cleaner element (407) in the housing (411) and then channelized to the engine in suction stage, therefore the fuel vapor adsorbed in not scattered in the inside region of the secondary compartment (404) of the air cleaner assembly.

[00050] As per one embodiment of the present invention, the housing (411) provided on the outer region (404a) of the secondary wall structure (404w) is closed by a cover (408) (as shown on fig. 4), ensuring that the secondary cleaner element is securely placed inside the housing. This configuration provides ease of serviceability and accessibility of the secondary filter element. The outer region (404a) of the secondary wall structure (404w) also includes plurality of extended mounting means (414) having openings, which enable secure attachment of the air cleaner assembly with the frame of the vehicle. Further, a Secondary Air Injection (SAI) air cleaner (not shown) is mounted to a SAI valve bracket (not shown) by various attachment means like bracket, fasteners etc., ensuring reduced number of components.

[00051] As per one embodiment of the present invention, the cover (408) includes plurality of ports, a breathing port (409) and an atmospheric air port (410) (as shown in fig. 4) and the housing (411) includes a plurality of ports, a purge port (406) and a drain port (406a) (as shown in fig. 4a). During breathing process of the fuel tank, the atmospheric port (410) channelizes atmospheric air (shown by arrow in fig 4b) to the fuel tank (103) through the housing (411) having secondary cleaner element (407) and through a breathing port (409) (as shown by arrows in fig. 4b), ensuring efficient functioning of the fuel tank. Also, during suction stage of the engine, the purge port (406) of the housing (411) channelizes fuel vapor adsorbed by the one or more secondary cleaner element (407) to the engine along with atmospheric air drawn from the atmospheric port (410) thereby ensuring efficient combustion in the engine. The drain port (406a) is provided to drain out any excess fuel collected which for example enters accidentally inside the housing at the time of vehicle roll over (as shown in fig. 4c). Further, the cover (408) has an extended member (408a) (as shown in fig. 4b) which restricts the release of fuel vapor to the atmosphere through atmospheric port., as the extended member (408a) forms a channel to channelize the fuel vapor inside the air cleaner assembly at the intake stage of the engine of the vehicle. A circular annular ring (415) is inserted on the extended member (408a) of the cover, while assembling the cover (408) with the housing (411). This ensure safe and secured placement of the secondary air cleaner element (407) in the housing.

[00052] Fig. 5 is a perspective view of secondary wall structure (404w) of the air cleaner assembly as per another embodiment of the present invention. As per one embodiment of the present invention, the housing (411) is disposed in the inner region of the secondary wall structure (404w) in the air cleaner assembly, ensuring efficiency of the secondary air cleaner element (407). [00053] The invention helps in overcoming the problem of space constraints, minimizing the use of components, increasing the ease of accessibility and serviceability of the secondary air cleaner element in the air cleaner assembly of the vehicle while maintaining the overall weight and width of the vehicle. Additionally, the present invention addressed all problems of known art in a cost effective manner.

[00054] Advantageously, the embodiments of the present invention, describes the potential modifications in the air cleaner assembly, where the air cleaner assembly includes two compartments, primary compartment and secondary compartment, where the secondary compartment includes the secondary cleaner element.

[00055] Many other improvements and modifications may be incorporated herein without deviating from the scope of the invention.

List of reference symbol: ig. 1:

100: Step through Type Vehicle.

126: Handle Bar

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: Front Suspension

113: Brake Lever

103: Fuel Tank

114: Fuel cap 118: Cover Member

123: Cylinder Head

124: Cylinder

122: Engine Assembly

125: Engine

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

101 : Mono Tube Type Frame

101a: Head Tube

101b: Main frame 101c: Down frame

101 d: Rear frame

201 : Pair of cover frame mounting bracket

202: Engine Mounting Bracket

203: Front Bracket

Fie. 3

301 : Air Cleaner Assembly

302: Roll Over Valve.

Fie. 3a

309: Fuel Hose

309a; one end of fuel hose

309b: another end of fuel hose.

310: ROV Hose

303: outlet of fuel tank

401 : Primary Compartment

40 Iw: Primary Wall Structure

402; outlet port to engine

403; Partition Wall

404: Secondary Compartment

404w: Secondary Wall Structure

407: Secondary Cleaner Element

408: Cover

408a: Extended member 406: Breathing Port

410: Atmospheric Port

Fig. 4a

406: Purge Port

406a: Drain Port

405: Inner Region

414: Extended Member with opening

411 : Housing

L: Length

D: Diameter

413 : Relief

412: Air Inlet port

404a: Outer Region

Claims

We Claim;

1. A two wheeled type vehicle (100), said vehicle (100) comprising: a frame (101) providing skeletal support to said vehicle (100); said frame (101) includes a main frame (101b); a fuel tank (103) is mounted on said main frame (101b); said fuel tank (103) has vapor outlet (303), said outlet (303) is connected to an air cleaner assembly (301); and said air cleaner assembly (301) includes plurality of compartments, a primary compartment (401) and a secondary compartment (404) formed by a primary wall structure (401w) and secondary wall structure (404w) respectively, wherein a housing (411) being integrally attached with said secondary wall structure (404w ).

2. An air cleaner assembly (301) for a two wheeled type vehicle (100), said air cleaner assembly (301) comprising; a primary compartment (401); a secondary compartment (404) formed by a primary wall structure (401w) and secondary wall structure (404w) respectively; wherein said secondary wall structure (404w) includes an outer region (404a) and inner region (405), wherein a housing (411) being disposed on said outer region (404a) of said secondary wall structure (404w) and wherein a secondary cleaner element (407) being disposed in said housing (411),

3. The air cleaner assembly (301) as claimed in claim 2, wherein said housing (411) being integrally attached on said inner region (405) of said secondary wall structure (404w).

4. The air cleaner assembly (301) as claimed in claim 2, wherein said outer region (404a) of said secondary wall structure (404w) has an air inlet port (412) to channelize atmospheric air inside said secondary compartment (404) of said air cleaner assembly (301).

5. The air cleaner assembly (301) as claimed in claim 2, wherein said housing (411) has a predetermined diameter D.

6. The air cleaner assembly (301) as claimed in claim 5, wherein said diameter D is in predetermined range of 40mm to 60mm.

7. The air cleaner assembly (301) as claimed in claim 2, wherein said housing (411) has a predetermined length L.

8. The air cleaner assembly (301) as claimed in claim 7, wherein said length L in in predetermined range of 60mm to 80mm.

9. The air cleaner assembly (301) as claimed in claim 2, wherein said housing (411) being covered by a cover (408).

10. The air cleaner assembly (301) as claimed in claim 9, wherein said cover (408) has plurality of ports, an atmospheric port (410) and a breathing port (409), where said atmospheric port (410) channelizes atmospheric air to a fuel tank (103) of said vehicle (100) through said housing (411) having secondary cleaner element (407) and subsequently through a breathing port (409).

11. The air cleaner assembly (301) as claimed in claim 9, wherein said cover (408) has an extended member (408a) to restrict release of fuel vapor in atmosphere.

12. The air cleaner assembly (301) as claimed in claim 2, wherein said housing (411) has a purge port (406) and a drain port (406a), where during engine suction stage, said purge port (406) channelizes fuel vapor adsorbed by said secondary cleaner element (407) into the primary wall structure through a partition filter (403) into an engine (125) of said vehicle .

13. The air cleaner assembly (301) as claimed in claim 2, wherein said drain port (406a) drains out excess fuel from said housing (411).

14. The two wheeled type vehicle (100) as claimed in claim 1, wherein said vapor outlet (303) of said fuel tank (103) is attached to a hose (309) having two ends (309a, 309b), where one end (309a) of said hose (309) is connected to said outlet (303) of said fuel tank (103) and another end (309b) of said hose (309) is connected to a roll over valve (302).

15. The two wheeled type vehicle (100) as claimed in claim 13, wherein said roll over valve (302) is connected said air cleaner assembly (301) through a hose (310).

16. A method for breathing fuel vapor inside fuel tank from an air cleaner assembly of a two wheeled vehicle, said method comprising; configuring said air cleaner assembly with a hosing and said fuel tank in said two wheeled vehicle; providing cover of said housing with an atmospheric port and a breathing port; channelizing atmospheric air by said atmospheric port to said fuel tank of said two wheeled vehicle; receiving atmospheric air inside said fuel tank through said housing and said breathing port.