FIELD OF INVENTION

The present invention generally relates to an exhaust system of a motorcycle and more particularly relates to a new structure and mounting arrangement of an exhaust system with respect to the location of the engine.

BACKGROUND OF THE INVENTION

Generally, in motorcycles exhaust air from the engine goes to the exhaust system or normally known as Muffler for purification which has an outlet into the air for exit of purified air into the atmosphere.
Said exhaust systems provides a safe, efficient and voluminous path to environment after purification of the un-burnt gases coming out of the engine. Volume of the exhaust system helps to reduce the exhaust gas noise.

The exhaust volume depends upon the capacity of the engine and the power output. Thus voluminous exhaust systems are a necessity for higher capacity motorcycles.

In existing low capacity motorcycle, normally muffler body is mounted outside of the frame area of the motorcycle. In this type of designs and mounting arrangement problems like less banking angle and heat discomfort from the exhaust to the rider are very common.

Further, in above described mounting arrangement as muffler body is secured or mounted outside of the frame boundary of the motorcycle more issues likes CG shift towards muffler body side results in difficulty in

motorcycle stability and manoeuvrability especially for a higher capacity motorcycle. Also as per style requirement of the motorcycle muffler expansion chamber shall not be of big size and which create issues for volume requirement of the exhaust chamber.

Hence there is a need to overcome the above problems associated with the layout and construction of the exhaust system for higher capacity motorcycles without comprising on desired performance, noise reduction and safety. The present invention is to overcome the said problems.

SUMMARY OF THE INVENTION
The present invention is related to an exhaust system which is fixed with the engine such that the exhaust system is secured below the motorcycle i.e. engine in the mounting space between the front wheel and rear wheel.

Said exhaust system has two exhaust chambers viz. primary exhaust chamber and secondary exhaust chamber secured in a same horizontal plane below the engine ensuring centre of gravity of the motorcycle in the centre line.

Said exhaust system further has a primary exhaust pipe connected to exhaust port of a cylinder head of the engine at one end and fixed with primary exhaust chamber at other end.

A secondary exhaust pipe is connected to primary exhaust chamber at one end and connected to a secondary exhaust chamber at other end. The secondary exhaust chamber has a main exhaust exit for exit of purified exhaust air into the atmosphere. The primary and secondary exhaust chambers form a shape of numeral 2 from the side view.

Summary provided above explains the basic features of the invention and does not limit the scope of the invention. Additional detailed information related to the enablement of the invention will be provided in the detailed description and accompanying claims. Scope of the invention shall be based on the claims provided.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
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 limited of the present invention and a brief description of the drawing is as follows:

Figure 1 is showing the side layout of the claimed motorcycle in order to describe embodiments of the invention.

Figure 2 is depicting the bottom view of the claimed motorcycle showing the essential embodiments in order to provide assembly and enablement requirements of the invention.

Figure 3 is providing the detailed view of the essential embodiment of the invention in order to depict the working of said essential embodiment.

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 so that others skilled in the art may utilize their teachings. The invention may have application to all types of motorcycles.

Referring to Figure 1 mounting arrangement of different embodiments of the claimed invention is explained. A motorcycle 100 has frame 102 which is supporting a steering assembly 103, engine 110, swing arm 109 and rear suspension system 105. Further said steering assembly 103 supports front wheel 108 and front fender 107. Said swing arm 109 supports the rear wheel 106 and said rear suspension system 105 is also fixed with the swing arm 109. A seat 104 is mounted over the frame 102 such that it is covering the rear portion of the frame 102.

Now referring back to Figure 1 and Figure 2, an exhaust system 101 is fixed with the engine 110 such that the exhaust system 101 is secured below the motorcycle 100 in the mounting space between the front wheel 108 and rear wheel 106.

The exhaust system 101 has primary exhaust pipe 113 connected to exhaust port 112 of cylinder head 111 of the engine at one end. Said primary exhaust pipe 113 is further fixed with a primary exhaust chamber 117 at other end.

Said exhaust system 101 further has a secondary exhaust pipe 115 which is connected to primary exhaust chamber 117 at one end and to a secondary exhaust chamber 114 at other end. Mentioned secondary exhaust chamber 114 has a main exhaust exit 118 through which purified air from the exhaust system 101 exits to the atmosphere.

As shown in Figure 1, primary chamber of the exhaust system 101 is mounting with the rear part of the engine through exhaust mounting point 116 and mounted with the front part of the engine through exhaust mounting point 116. This type of exhaust mounting arrangement is not suitable for off road bikes in which required ground clearance is very high.

Referring back to Figure 2 and Figure 1, as shown exhaust system 101 is secured between front wheel 108 and rear wheel 106 such that the exhaust system 101 exactly falls below the engine 110 and secured at level below the swing arm 109. Mentioned mounting arrangement fills available unused space between the wheels 108, 106 and below the engine 110. Provided mounting location of the exhaust system 101 ensured that centre of gravity CG of the engine remains in centre line CL of the motorcycle 100.
Further as shown in Figure 1, primary 117 and secondary 114 exhaust chambers and pipe 113,115 are arranged in such a way that the exhaust system 101 forms a shape similar to numeral 2.

Referring to Figure 3, it is shown that primary 117 and secondary 114 exhaust chambers are secured in a single horizontal plane and connected through the primary 113 and secondary 115 exhaust pipes. Said primary exhaust pipe 113 facilitates exhaust air entry 120/ circulation from engine 110 to primary exhaust chamber 117. Further, the secondary exhaust pipe 115 facilitates flow of primary circulated exhaust air from primary exhaust chamber 117 to secondary exhaust chamber 114. Mentioned secondary exhaust chamber 114 has a main exhaust exit 118 facilitating exhaust air exit 119 into the atmosphere from secondary exhaust chamber 114.

Further, as shown in Figure 1 to Figure 3 exhaust system 101 facilitates the flow of air in reverse direction i.e. front to back and then back to front which provides more volume for the expansion of the air ensuring more purification of exhaust air and lower noise level of the exhaust unit. Main exit 118 of exhaust gas is at the front of the motorcycle 100 and below the engine 110 or the motorcycle 100 resulting safe exit of hot air as air coming out in the atmosphere passes below the motorcycle 100 and does not reaches to the rider.

Drawing Number Classification
100 - Motorcycle
101 - Exhaust System
102 - Frame
103 - Steering Assembly
104 - Seat
105 - Rear Suspension
106 - Rear Wheel

107 - Front Fender
108 - Front Wheel
109 - Swing Arm
110 - Engine
111 - Cylinder Head
112 - Exhaust Port
113 - Primary Exhaust Pipe
114 - Main Exhaust Pipe
115 - Secondary Exhaust pipe
116 - Exhaust Mounting point,
117 - Primary Exhaust Chamber
118 - Secondary Exhaust Chamber
119 - Main Exhaust Exit
120 - Exhaust Intake
121 - Primary Chamber Exit
122 - Primary Chamber Intake
123 - Secondary Chamber Intake

WHAT IS CLAIMED IS

1) A motorcycle comprising a steering assembly supporting a front wheel and a front fender, a swing arm connected to an engine and a rear wheel together supported by a rear suspension system such that the steering assembly, swing arm, rear suspension and engine are supported by a frame and an exhaust system, fixed with the engine and characterized by its split body structure and reverse flow for exhaust gas, is secured below the motorcycle in the mounting space between the front wheel and rear wheel wherein the exhaust system further comprises a primary exhaust pipe connected to an exhaust port of an cylinder head of the engine at one end and fixed with a primary exhaust chamber at other end such that an secondary exhaust pipe is connected to said primary exhaust chamber at one end and connected to a secondary exhaust chamber at other end and wherein said secondary exhaust chamber has a main exhaust exit.

2) The motorcycle, as claimed in claim 1, wherein the exhaust system is secured below the swing arm.

3) The motorcycle, as claimed in claim 1, wherein the primary and secondary exhaust chambers are mounted with the engine at atleast one exhaust mounting point.

4) The motorcycle, as claimed in claim 1, wherein the primary and secondary exhaust chambers form a shape of numeral 2 from the side view.

5) The motorcycle, as claimed in claim 1, wherein the primary and secondary exhaust chambers are secured in a single horizontal plane below the engine.

6) The motorcycle, as claimed in claim 1, wherein the primary exhaust pipe facilitates exhaust air circulation from engine to primary exhaust chamber.

7) The motorcycle, as claimed in claim 1, wherein the secondary exhaust pipe facilitates flow of primary circulated exhaust air from primary exhaust chamber to secondary exhaust chamber.

8) The motorcycle, as claimed in claim 1, wherein the secondary exhaust chamber has a main exhaust exit facilitating exhaust air exit into the atmosphere from secondary exhaust chamber.