TITLE

A Supercharger for an Engine Field of the invention

This invention relates to the field of supercharger for an engine. Background of the invention

Superchargers are used to increase the power generated by an engine. Superchargers use a compressor to increase the pressure or density of air supplied to an engine.

Superchargers are powered mechanically by belt or chain-drive from the engine's crankshaft. In order to increase the performance of the supercharger there is a need to allow the supercharger to have an additional source of input in addition to atmospheric air. The other source of air, a supercharger may have access to is, the exhaust from the engine. But, the exhaust from the engine cannot be used directly as the impurities present in the exhaust may cause damage to the components to the supercharger. Hence, there is also a need for a purification mechanism before the air and/ or exhaust enters the supercharger.

Prior art patent application US8099957 supercharger compressor includes a plurality of rotors rotatably mounted in a housing, a first inlet for air, a second inlet for recirculated exhaust gas, and a flow separator. The flow separator is arranged interior the housing and configured to form a slideable seal with at least one rotor of the plurality of rotors, the slide able seal fluidically isolating the first inlet from the second inlet, at least in part, and retarding pressure equalization there between. Brief description of the accompanying drawing

Different modes of the invention are disclosed in detail in the description and illustrated in the accompanying drawing:

FIG. 1 illustrates a supercharger for an engine; and

FIG. 2 illustrates a supercharger provided with a cleaning material. Detailed description of the embodiments

FIG. 1 illustrates a supercharger (200) for an engine (102). The supercharger (200) disclosed herein derives power from the engine (102) crankshaft. During working, the supercharger (200) takes in air, and exhaust, which is re-circulated from the exhaust gas recirculation valve (EGR) (104) and compresses it to a pressure that is greater than atmospheric pressure. The result is more air is forced into the engine (102). The engine (102) now has the ability to draw in more fuel, corresponding to increase in the volume of air supplied and thereby increasing the charge supplied for combustion. This increases the power developed by the engine (102). The exhaust gas that reaches the supercharger (200) is filled with dust and carbon deposits and this needs to be purified before it is sent back to the engine (102) along with the atmospheric air. This is achieved with the help of cleaning material (206) that will be described in the detailed description of Fig. 2.

FIG. 2 illustrates a supercharger (200) provided with a cleaning material (206). The supercharger (200) may be a roots type supercharger (200). The supercharger (200) is located along the inlet to an engine (102) and has a first rotatable member (202) and a second rotatable member (204). The first rotatable member (202) and the second rotatable member (204) are mounted on a shaft that derives power from the crankshaft of the engine (102) with the help of a drive. The first rotatable member (202) and the second rotatable member (204) rotate along respective axis of the shaft on which they are mounted. The supercharger (200) is adapted to receive recirculated exhaust from an engine (102) along with fresh air and is provided with a cleaning material (206). The cleaning material (206) is provided in a manner such that at least a part of the first rotatable member (202) and at least a part of the second rotatable member (204) in the supercharger (200) contacts the cleaning material (206). The profile of the first rotatable member (202) and the second rotatable member (204) is such that the cleaning material (206) can be easily adapted onto the same. At least a part of the first rotatable member contacts the cleaning material (206) provided on the second rotatable member (204). At least a part of the second rotatable member (204) contacts the cleaning material (206) provided on the first rotatable member (202).

An interlobe trough is formed at the region where the blades of the rotatable member meet. As seen from FIG. 2 an interlobe trough is depression created in between the blades of the first rotatable member and the second rotatable member. The first rotatable member (202) will be in contact with the cleaning material (206) provided on the interlobe trough (210) of the second rotatable member (204) and vice-versa. The exhaust that is received via the EGR valve (104) is sucked into the supercharger (200) due to rotation of the first rotatable member (202) and the second rotatable member (204), due to this sucking action the exhaust gas particulates get deposited on the cleaning material (206). Particulates present in the exhaust are removed by the cleaning material (206). The pressurization of the exhaust and the atmospheric air happens within the space created between the lobes of the first rotatable member (202) and the second rotatable member (204) and the inner walls of the housing of the supercharger (200).

In an embodiment, the cleaning material (206) may be made from rubber. The cleaning material (206) is chosen in such a way so as to have good wear resistant properties and temperature resistance. The cleaning material (206) is provided on the interlobe trough

(208) and (210) of the first rotatable member (202) and the second rotatable member (204). The cleaning material (206) may be glued onto the interlobe trough (208) and (210) of the first rotatable member (202) and the second rotatable member (204). The cleaning material (206) may be press fitted and/or snap fitted onto the interlobe trough (208) and (210) of the first rotatable member (202) and the second rotatable member (204). Alternatively, the cleaning material (206) is fitted onto the interlobe trough (208) and (210) of the first rotatable member (202) and the second rotatable member (204) through a combination comprising, pins, screws, nut and bolt arrangement and the like.

It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention in terms of type of supercharger used and the mechanism through which the cleaning material is attached onto the interlobe trough of the rotatable member of the supercharger . Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.