Claims:I claim:
1. A supercharger (100) comprising:
a housing (102) with an inlet (106) and an outlet (104) for the passage of a fluid;
at least two shafts (116, 110) located within said housing (102);
at least one rotor (120, 108) mounted on each of said at least two shafts (116, 110); and
characterized in that
at least two driven member (114, 112), one mounted to an end of each of said at least two shafts (116, 110), said at least two driven members (114, 112) are directly driven by a crankshaft of an engine.

2. The supercharger (100) as claimed in claim 1, wherein said at least two driven members (114, 112) and said at least one driving member (206) may be at least one selected from a group comprising a sprocket, a pulley or a combination thereof.

3. The supercharger (100) as claimed in claim 1, wherein said at least two driven members (114, 112) and said at least one driving member (206) are connected with a coupling means (204) selected from a group of coupling means comprising a one sided timing belt, a two sided timing belt, a chain and the like.

4. The supercharger (100) as claimed in claim 1, wherein said at least one rotor (120, 108) of each of said at least two shafts (116, 110) comprises at least two straight lobes.

5. The supercharger (100) as claimed in claim 1, wherein said at least one rotor (120, 108) of each of said at least two shafts (116, 110) comprises at least two twisted lobes.

6. The supercharger (100) as claimed in claim 1, wherein at least one of said at least two driven members (114, 112) is mounted either internal or external to said housing (102).

7. The supercharger (100) as claimed in claim 1, wherein a first driven member (114) is mounted on a first shaft (116) and a second driven member (112) is mounted on a second shaft (110).

8. The supercharger (100) as claimed in claim 1, wherein at least one supporting driven member (202) is mounted on said housing (102).

9. The supercharger (100) as claimed in claim 1, wherein each of said at least two driven member (114, 112) are independently driven by a respective driving member (206).
, Description:Field of the invention:
[0001] The present disclosure relates to a supercharger and specifically relates to supercharger for an Internal Combustion Engine (ICE).
Background of the invention:
[0002] A US patent application US5289813 discloses, a mechanical supercharger includes a housing, first, second and third shafts rotatably supported on the housing, respectively, a first timing gear disposed on the first shaft, a second timing gear disposed on the second shaft and engaged with the first shaft timing gear, a first rotor disposed on the first shaft, a second rotor disposed on the second shaft and engaged with the first rotor, a first pulley disposed on one end of the first shaft, an electromagnetic clutch interposed between the first shaft and the first pulley and being selectively intermittent a transmission of driving force between the first shaft and the first pulley, a reduction gear disposed on one end of the third shaft through an one-way clutch and engaged with the second timing gear, a second pulley disposed on the other end of the third shaft and a driving force transmission means for transmitting driving force of engine to the first and second pulleys so that the first and second pulleys are simultaneously rotated in the same direction. Thereby, it is possible to reduce the number of the additional parts for changing the supercharging quantity in response to the condition of the engine and it is possible to prevent the unnecessary increasing of the rotating mass of the rotation groups which are rotated for supercharging.
Brief description of the accompanying drawings:
[0003] An embodiment of the disclosure is described with reference to the following accompanying drawings,
[0004] Fig. 1 illustrates an exploded view of a supercharger, according to an embodiment of the present disclosure; and
[0005] Fig. 2 illustrates an arrangement of coupling the supercharger to an engine, according to an embodiment of the present disclosure.
Detailed description of the embodiments:
[0006] Fig. 1 illustrates an exploded view of a supercharger, according to an embodiment of the present disclosure. The supercharger 100 comprises a housing 102 with an inlet 106 and an outlet 104 for the passage of a fluid. The supercharger 100 is shown with an axial inlet and radial outlet, but the supercharger 100 of the present disclosure is applicable for any other configuration of inlet 106 and outlet 104 such as radial inlet and radial outlet, radial inlet and axial outlet and the like. At least two shafts 116, 110 are located within the housing 102. The supercharger 100 also comprises at least one rotor 120, 108 mounted on each of the at least two shafts 116, 110. The supercharger 100 further comprises at least two driven members 114, 112 mounted on one end of each of the at least two shafts 116, 110. The at least two driven members 114, 112 are directly driven by a crankshaft of an engine (not shown). A cover plate 118 covers one end of the housing 102 where the driven members 114, 112 are mounted.
[0007] The at least two driven members 114, 112 and the at least one driving member 206 may be at least one selected from a group comprising a sprocket, a pulley or a combination thereof. The at least one driven member 114, 112 is driven by the engine.
[0008] The at least two driven members 114, 112 and the at least one driving member 206 of the engine are connected with a coupling means 204 selected from a group of coupling means comprising a one sided timing belt, a two sided timing belt, a chain and the like.
[0009] The at least one rotor 120, 108 of each of the at least two shafts 116, 110 comprises at least two straight lobes. Alternatively, the at least one rotor 120, 108 of each of the at least two shafts 116, 110 comprises at least two twisted lobes.
[00010] At least one of said two driven members 114, 112 are mounted either internal or external of the housing 102 to the respective shafts 116, 112. The two shafts 116, 110 are held by the housing 102 parallel to each other.
[00011] The at least two driven members 114, 112 and the at least one driving member 206 are connected with a double sided timing belt 204 which uses both sides of the belt 204. Alternatively, a one sided timing belt 204 is allowed to be used for connecting the at least one driven member 114, 112 and the at least one driving member 206.
[00012] According to an embodiment of the present disclosure, a first driven member 114 is mounted to a first shaft 116 and a second driven member 112 is mounted to a second shaft 110. Further a first rotor 120 is mounted on the first shaft 116 and second rotor 108 is mounted on the second shaft 110.
[00013] Fig. 2 illustrates an arrangement of coupling the supercharger to an engine, according to an embodiment of the present disclosure. The supercharger 100 comprises a supporting driven member 202 mounted to the housing 102. Alternatively, the supporting driven member 202 is mounted to chassis of a vehicle or any other suitable mounting locations within the vehicle. The supporting driven member 202 assists in attaining proper belt wrap, and belt tension. Therefore the relative timing error between the rotors 120, 108 is maintained within acceptable values (such as around 1°). The gears which are conventionally used in rotating the rotors 120, 108 are replaced by the driven members 114,112 also referred to as timing pulleys/sprockets and is directly coupled with the driving member 206.
[00014] According to an embodiment of the present disclosure, at least one driving member 206 is independently provided for each of the driven members 114, 112. Thus two coupling means 204 comprising a first coupling means for the first driven member 114 and a second coupling means for the second driven member 112 are provided. At least one third shaft and at least one supporting driven member 202 is arranged to achieve the independent drive of each driven member 114, 112. The length of each of the shafts 116, 110 also varies based on type of connection between the driven members 114, 112 and the at least one driving member 206. Alternatively, at least one other shaft is arranged to achieve the independent drive of each driven member 114, 112. The length of each of the shafts 116, 110 also varies based on type of connection between the driven members 114, 112 and the at least one driving member 206.
[00015] According to yet another embodiment of the present disclosure, the supercharger 100 is coupled with at least one second supercharger 100 in any one of a side by side assembly and a front facing assembly. In side by side assembly, the driven members 114, 112 of the two superchargers 100 are connected with a single coupling means 204 or with independent coupling means 204, connected to at least one driving member 206. Alternatively, the additional shaft and/or the additional driven member 202 is used to attain the side by side assembly.
[00016] In front facing assembly, the at least two superchargers 100 are coupled facing opposite to each other with either a common driven members 114, 112 or independent driven members 114, 112, connected to at least one driving member 206. Alternatively, in both the assemblies, at least one additional shaft and/or at least one supporting driven member 202 is allowed to be used to attain a desired coupling either on the same axis of rotation or a different axis of rotation.
[00017] In yet another embodiment of the present disclosure, the supercharger 100 is coupled with the crankshaft of the engine either directly or through a clutch (not shown). In the design comprising clutch, the supercharger 100 is decoupled from the crankshaft when the clutch is activated, and coupled to the crankshaft when the clutch is deactivated. Alternatively, the supercharger is made to couple with the crankshaft on activating the clutch and decouple from the supercharger on deactivating the clutch.
[00018] The supercharger 100 of the present disclosure does not require any kind of lubrication, so additional chamber is obviated. The front end of the supercharger 100 (opposite to the air intake) becomes simpler. The additional cost of gears, lubrication, sealing and gear cover plate 118 are eliminated providing easier assembly of the supercharger 100 components. The present disclosure is a simplified system comprising lobe assembly, housing 102, cover plate 118 and driven members 114, 112. The driven members 114, 112 are directly driven from engine either together or independently. The present disclosure also minimizes the disadvantage of belt drive i.e. belt elongation, and timing error etc. The present disclosure also allows two or more superchargers 100 to be combined and assembled in variety of positions and arrangements in order to match or fulfill a specific design requirement. A direct driven rotary lobe supercharger is disclosed.
[00019] It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention. 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.