Claims:I claim:

1. A supercharger (200) for an engine, comprising at least;
a housing (202), said housing 202 having at least a first path (204) for flow of lubricant; and

a cover plate (206) attached to said housing (202) and defining a space therein between;

said cover plate (206) accommodating a shaft (208), said shaft 208 adapted to rotate a disc (210) in said space, said shaft 208 being eccentrically fitted to said disc (210);

at least one ring member (212) adapted to receive rotational motion of said disc (210) via a bearing (214);

said ring member (212) engaged to a plunger (216) located in a bore (218) of said housing (202); and

a sealing member (220) in contact with said ring member (212).

2. The supercharger 200 of claim 1, wherein said ring member 212 is in mechanical engagement with said plunger 216 via a bolt.
3. The supercharger 200 of claim 1, wherein said ring member 212 is in mechanical engagement with said plunger 216 via a screw member.
4. The supercharger 200 of claim 1, wherein said bearing (214) is a roller bearing
5. The supercharger 200 of claim 1, wherein said housing 202 has a second path (226) for flow of lubricant from said housing 202.
6. The supercharger 200 of claim 1, wherein a spring (222) ensures contact of said sealing member with said ring member 212.
7. The supercharger 200 of claim 1, wherein the bore of said housing 202 is provided with a plug (224).
, Description:Field of the invention
[0001] This invention relates to the field a supercharger.

Background of the invention
[0002] A supercharger being driven by a rotating piston compressors are well known in the art. A rotating compressor in its simplest form, generally comprises a reciprocating piston that causes a rotor to slide within the housing, the rotor also being rotated with the help of a shaft. The above mentioned piston needs to be lubricated. It is observed that the oil present in the lubricated piston mixes with the air that needs to be charged in the compressor. This leads to oil and air mix entering the cylinder of the engine. The emission requirement from the engine is thus compromised. Hence there is a need for a compressor in which the mixing of oil with the air is avoided.

[0003] FIG. 1 illustrates a supercharger 100 used in the state of art. A shaft 102 is present in the supercharger, the shaft 102 rotates a disc 104. A reciprocating piston 106 functions like a separator between a low pressure chamber 108 and the high pressure chamber 110. From the figure, it can be seen that the oil that is used to lubricate the piston, will mix with the air that is present in the high pressure chamber 110. Oil mixed with compressed air will be sent as input charge to the engine.

Brief description of the accompanying drawing
[0004] Different modes of the invention are disclosed in detail in the description and illustrated in the accompanying drawing:

[0005] FIG. 2 illustrates a supercharger for an engine.

Detailed description of the embodiments
[0006] FIG. 2 illustrates a supercharger 200 for an engine. The supercharger 200 comprises at least housing 202 having at least a first path 204 for flow of lubricant, and a cover plate (206) attached to the housing 202 and defining a space there between. The housing 202 may have a second path for flow of lubricant from the housing 202. The cover plate 206 accommodates a shaft 208, the shaft 208 is adapted to rotate a disc 210 in the space. The shaft 208 may be driven by the engine. The shaft 208 is eccentrically fitted to the disc 210. At least one ring member 212 is adapted to receive rotational motion of the disc 210 via a bearing 214. The bearing 214 may be a roller bearing. The ring member 212 is engaged to a plunger 216 located in a bore 218 of the housing 202. A sealing member 220 is in contact with the ring member 212. A spring 222 ensures contact of the sealing member 220 with the ring member 212. The ring member 212 may be in mechanical engagement with the plunger 216 via a bolt. Alternately, the ring member 212 may be in mechanical engagement with the plunger 216 via a screw member

[0007] The sealing member 220 seals the area between the plunger 216 and the housing 202. The function of the sealing member 220 is to prevent the lubricant from flowing into the space and mixing with the air that is getting compressed in the supercharger 200. Also, the sealing member 220 prevents the compressed air from escaping out of the housing 202. The bore 218 of the housing 202 may be provide with a plug 224. The plug 224 can be removed during repair and maintenance of the components of the supercharger 200. The housing 202, the cover plate 206, the sealing member 220 and the ring member 212 ensure sealing between the high pressure chamber and the low pressure chamber. The ring member 202 may be not be in mechanical engagement with the housing 202 and/ or the cover plate 206. The tolerance of the ring member 212 with respect to the housing 202 and the cover plate 206 ensures necessary sealing and in turn define the efficiency of the supercharger 200. The low pressure chamber is in flow communication with the inlet of the supercharger 200 and allows air to enter the space. The high pressure chamber is in flow communication with the outlet of the supercharger 200.

[0008] For the purpose of better understanding the working of the supercharger 200 is explained herewith in further detail. Air from the atmosphere enters the supercharger 200 through the inlet and reaches the low pressure chamber of the supercharger 200. The shaft 208 that is accommodated in the cover plate 206 of the supercharger 200, rotates, the rotation of the shaft 208 causes the disc 210 to rotate, as the disc 210 rotates air from the low pressure chamber is sent to the high pressure chamber, where it is compressed and sent to the inlet of the engine via the outlet of the supercharger 200. The shaft 208 may be accommodated in the cover plate 206 with the help of bearings. Since, the shaft 208 is eccentrically attached to the disc 210, the rotation of the disc 210 causes the ring member 212 to translate. The ring member 212 receives rotational motion of the disc 210 via the bearing 214. The translation of ring member 212 happens along the axis of the plunger 216. Since the ring member 212 is mechanically engaged to the plunger 216, the plunger 216 also reciprocates in the housing 202. Since the reciprocating plunger 216 is in contact with the housing 202, there is a need to lubricate the plunger 216. The lubricant required for lubricating the plunger 216 flows through the first path 204 of the housing 202 and reaches the plunger 216. The translation of the plunger 216 causes the lubricant to come into contact with plunger 216 surface area and lubricate the plunger 216. The lubricant then flows out of the housing 202 from the second path. Due to the presence of sealing member 220, lubricant cannot leak/ or flow out and enter the low pressure chamber and/ or the high pressure chamber of the supercharger 200. This is because, the spring 222 ensures that the sealing member 220 is in contact with the ring member 212 during translation of plunger 216, thereby preventing formation of any gap between the sealing member 220 and the ring member 212 for the lubricant to escape.

[0009] With the proposed supercharger 200, mixing of oil with air is avoided. The supercharger 200 may be used for single cylinder engines and the like. The supercharger 200 may also be used on any type of engines where the requirement of pulsating charge is necessary.

[00010] 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 the type of supercharger, sealing member, bearings and the engine used. 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.