FIELD OF THE INVENTION

The invention generally relates to exhaust system of a motorcycle and more particularly to mounting arrangement of exhaust system for the motorcycle.

BACKGROUND OF THE INVENTION

Generally in motorcycles exhaust system is usually a piping system used to guide exhaust gases away from a controlled combustion inside an engine. The entire system conveys burnt gases from, the engine and includes one or more exhaust pipes. Motorcycle exhausts come in many varieties depending on the type of engine (single or multi cylinder) and its intended use. Generally a single inlet pipe for a single cylinder and multiple inlet pipes corresponding to the multiple cylinders. Mufflers are installed within the exhaust system of most internal combustion engines, although the muffler is not designed to serve any primary exhaust function. The muffler is engineered or designed as an acoustic soundproofing device designed to reduce the loudness/ noise of the sound pressure created by the engine.

The routing of an exhaust system generally ends at the rear in order to ensure exit of the exhaust gas into the atmosphere without coming in contact with the driver or pillion rider of the motorcycle. Designing, mounting, routing of the muffler also adds a great amount of importance towards the looks or the aesthetic of the vehicle. In addition to the technical functionalities location of the muffler or the exhaust unit is an important criterion for the overall motorcycle package to satisfy pure aesthetics. Further, general mounting of the exhaust system remains outside the width-wise frame area and where it is installed within the frame it become so bulky that centre of gravity becomes an issue. In order to maintain said centre of gravity issue multiple embodiments are installed in the exhaust unit which make it more bulky and expensive product.

SUMMARY OF THE INVENTION

Main objective of the present invention is to provide an exhaust system for motorcycle. Said exhaust system is mounted between the engine and the rear wheel such that the exhaust system is secured within the frame width of the motorcycle. Mentioned exhaust system further has a first chamber connected with the engine through a first flow passage and connected with a muffler unit through a secondary flow passage. Said muffler unit has a rearward inclined extension outlet(s) on its rear side configured to facilitate exhaust gas exit into the atmosphere. This muffler unit is secured between rear part of the frame and the rear wheel such that location of muffler unit remains above the level of rear wheel during full compression of rear suspension system. Arrangements provided for described exhaust system mono shock absorber type motorcycles are best suitable. In such cases mono shock absorber is positioned between splits of the muffler unit. Mentioned arrangement of the exhaust system helps to maintain more stability in the centre of gravity of the motorcycle due to its specific location within the width-wise area of the frame.Summary provided in the present description presents the concept and important embodiments of the invention and not intended to limit the scope of the invention. Scope of the invention is defined in the claim(s) provided and shall be understood entirely on the basis of claim(s).

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given herein below and the accompanying drawing which is incorporated in and constitute embodiments of the invention, illustrate several aspects of the invention and together with a description of the embodiments serve to explain the principles of the invention and thus, are not limiting the present invention and a brief description of the drawing is as follows:

Figure 1 and Figure 2 are depicting arrangement and mounting details of claimed exhaust unit in the motorcycle.

Figure 3 and Figure 4 are providing explanatory details and essential embodiments of the claimed exhaust system.

DETAILED DESCRIPTION OF THE INVENTION

The embodiments disclosed below are not intended to be exhaustive or to limit the invention to the precise forms disclosed in the following detailed description. Rather, the embodiments are chosen and described for enablement purpose of the invention. The invention may have application to all types of motorcycles. The scope of the invention is entirely based upon the claims provided. Reference is made to Figure 1 and Figure 2 mounting arrangement of the exhaust system 114 in the motorcycle 100. Mentioned exhaust system 114 is fixed within the area of the frame 101 of the motorcycle 100. Said frame is attached with the steering assembly 111 which is further fixed with front suspension system 110 fixed with front wheel 109. Mentioned exhaust system 100 is secured between the engine 108 and the rear wheel 104 of the motorcycle 100 such that the exhaust system 114 comes within width wise area of the frame 101. Engine 108 is connected with the rear wheel 104 through a transmission assembly 105 which is covering the-exhaust system 114 from one side of the motorcycle 100.

As best assembly for mentioned exhaust system 114, single/mono shock absorber 113 is fixed on the rear side of the motorcycle 100 which defines its rear suspension system 113. Said shock absorber 113 or rear suspension system 113 is fixed with the frame 101 of the motorcycle on its upper end and connected with the swing arm (not shown in the figure(s)) through a bracket 115. Further, as shown in Figure 2, said exhaust system 114 has two main embodiments connected to each other through a flow tube called as secondary flow passage 107. As shown, lower embodiment called as first chamber 106 is secured between engine 108 and rear wheel 104, such that it is fixed within the width wise area of the frame 101. This first chamber 106 is positioned below the swing arm (not shown in figure) of the motorcycle 100 and is partially covered by the transmission assembly 105 on one side of the motorcycle 100. A first flow passage 112 is coming out of the engine 108 of the motorcycle facilitating flow of exhaust gas from engine 108 exhaust port to the first chamber 106. First chamber 106 is further connected to a muffler unit 116 placed exactly over the first chamber 106 such that said muffler unit 116 receives exhaust gas from the first chamber 106 and exhale in the atmosphere.

Referring back to Figure 1 and Figure 2, muffler unit 116 is structured in such a way that the single shock absorber- 113 or mono type suspension system 113 or rear suspension unit 113 is housed between two outlets 102 of the muffler unit 116. Said muffler unit 116 can have one or more outlets 102 on its rear end and said outlet 102 may or may not split 103 apart depending upon the design requirement of the exhaust unit 114. As best arrangement of the muffler unit 116, considering aesthetic requirements and centre of gravity balance, it has two outlets 102 on its rear end such that said outlets 102 are separated by a gap 103 or a split 103 on the upper end and are integrated at the lower end. Rear shock absorber 113 (mono suspension) is secured in said split 103. Again referring to Figure 2, muffler unit 116 can have a single outlet 102 and hence muffler unit 116 can be mounted on right or left side of the rear suspension system 113 but it always remains within the width-wise area of the frame 101. Further, Figure 3 and Figure 4 shows detailed arrangement of embodiments of the claimed exhaust system. First chamber 106 is structured in a manner that exhaust gas coming out of the engine 108 expands and gets purified in said first chamber 106 and then goes to the muffler unit 116. In muffler unit 116 it expands and hence this muffler unit 116 also acts as a silencer for the exhaust system 114.

As shown, muffler unit 116 and the first chamber 106 are arranged in same vertical plane i.e. muffler unit 1.16 is placed directly above the first chamber 106. First flow passage 112 is facilitating exhaust gas flow, from engine 108 to the first chamber 106, from its inlet end 112a to outlet end 112b. After processing inside the first chamber 106 purified exhaust gas flows through the secondary flow passage 107 from its inlet end 107a to outlet end 107b. Exhaust gas entered inside the muffler unit 116 expands and goes out through the outlet(s) 102. Location and construction of the exhaust system 114 ensures that the exhaust air flows out of the exhaust system 114 without harming pillion rider. As shown in Figure 1 to Figure 4, inclination of the muffler unit 116 is provided in such ways that exhaust air coming out of the outlet ports 102 directly flows from the vacant area Va. Vacant area Va is the area left after required packaging P of embodiments with frame 101 of the motorcycle is done.

With such arrangement exhaust air flowing out of the muffler unit 116 will not come in contact with any body part of rider(s) as well as embodiments assembled in the rear portion of the motorcycle 100. Size and length of the muffler unit 116 is again decided in accordance with the provided precautions. Further, muffler unit 116 is fixed above the first chamber 106 and inclined in such a way that muffler unit 116 is secured in the vacant area Va which does not come in the rear wheel area Sa of the rear wheel 104 especially at the time of full compression of the rear suspension system 113. Hence the inclined muffler unit 116 is fixed in vacant area Va in which the exhaust gas does not harm either the rider or the motorcycle and the location as well as mounting arrangement of the exhaust unit 114 increases the aesthetic looks of the motorcycle.

WHAT IS CLAIMED IS

1) A motorcycle comprising: *

a) an engine connected to a rear wheel through a transmission assembly such that the engine is fixed with a frame;

b) a rear suspension system secured with the frame on its upper end and with the transmission assembly on its lower end; and

c) an exhaust system mounted between the engine and the rear wheel such that the exhaust system is secured within the frame width of the motorcycle; wherein, said exhaust system comprises a first chamber connected with the engine through a first flow passage and connected with a muffler unit through a secondary flow passage such that the muffler unit comprises a rearward inclined extension with atleast one outlet on its rear side configured to facilitate exhaust gas exit into the atmosphere wherein said muffler unit is secured between rear part of the frame and the rear wheel.

2) The motorcycle, as claimed in claim 1, wherein the muffler unit is secured between rear part of the frame and the rear wheel such that location of muffler unit remains above the level of rear wheel during full compression of rear suspension system.

3) The motorcycle,- as claimed in claim 1, wherein the rear suspension system is a mono type suspension system.

4) The motorcycle, as claimed in claim 2, wherein the muffler unit comprises atleast one split, with atleast one outlet, configured to facilitate positioning of said mono type suspension system between the splits of the muffler unit.