Claims:We Claim:
1. A fuel rail device (10) in a fuel injection system comprising:
- a rail (12) having one inlet port (14) and at least one outlet port (16);
characterized in that
- a fuel distributor block (18) fitted to said at least one outlet port (16) of said rail (12).

2. The fuel rail device (10) as claimed in claim 1, wherein said fuel distributor block (18) is fitted to said outlet port (16) of said rail (12) through an interface connector (20).

3. The fuel rail device (10) as claimed in claim 1, wherein said fuel distributor block (18) is fitted to said outlet port (18) and said interface connector (20) through a high pressure connector (22).

4. The fuel rail device (10) as claimed in claim 1, wherein said fuel distributor block (18) has one inlet port (18a) and at least two outlet ports (18b, 18c).
, Description:Complete Specification:
The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed.
Field of the invention
[0001] This invention relates to a fuel rail device.

Background of the invention
[0002] An internal combustion (IC) engine using diesel fuel works on a compression ignition principle. As the name suggests in the compression-ignition principle, the diesel fuel has to be compressed to a high pressure value. The increase in pressure of the diesel increases the temperature of the diesel. The heat of compression of the diesel fuel is used to initiate ignition and burn the fuel in the combustion chamber of the diesel IC engine. Diesel IC engines do not use any igniters or spark plugs to ignite the fuel as the pressure and temperature of the diesel fuel is enough to ignite the fuel. However, one of most important aspects of a diesel IC engine is that the diesel has to be maintained at a particular pressure which aids in igniting the diesel fuel after it is introduced in the combustion chamber. To maintain pressure of diesel entering the combustion chamber, fuel supply devices known in the state of the art employ a common rail (Accumulator). The common rail type fuel injection systems house the add-on components such as Rail pressure sensor (RPS), Pressure control valve (PCV), sometimes a screw-plug. The rail has threaded connectors, depending on the number of cylinders/injectors in the specific system as outlet ports and corresponding inlet connector(s) to take-up the fuel from high pressure pump.

[0003] In a common rail type fuel supply device at least some volume of the diesel in always present in the common rail which helps in damping the pressure oscillations coming from the system. The common rail has two variants in terms of manufacturing. The first "LWR" Laser Welded Rail, employs the concept of machining the product from bar stock and then employing the process of Laser welding to fit-in the threaded connectors for high pressure pipes to injectors and from high pressure pump. The second concept, has forging as the basic principle of evolving the product geometry and then employs the machining for achieving the final geometries. The key factor that needs attention in the product is the fatigue strength, which is critical in achieving the lifetime requirements under the pulsating pressure loads. A pulsation test involving various pulsating pressures levels has to be successfully completed in order that the product be released for the application. (For eg: a pressure level means —pressure ranging from 50bar to 2400bar, Max pressure depending on the final pressure level that the product has to be released).

[0004] In case of modern low cost vehicle, where the main aim is to reduce the cost of the vehicle the use of one single large common rail increases the cost of the fuel supply device and in turn the overall cost of the vehicle.

[0005] Indian patent application 475/CHE/2012 discloses a fuel supply device for an internal combustion engine. The fuel supply device comprises a fuel distributor block comprising a recess locate at one end of the fuel distributor block, a first bore extending from base of the recess to a second end and a second bore perpendicular to the first bore and a pressure sensor located in the recess.

Brief description of the accompanying drawings:
[0005] Different mode of the invention is disclosed in detail in the description and illustrated in the accompanying drawings:
[0006] Figure 1 illustrates a fuel rail device in accordance with this disclosure.

Detailed description of the embodiments
[0007] Figure 1 illustrate a fuel rail device in accordance with this disclosure. The fuel rail device 10 comprises a rail 12 having one inlet port 14 and at least one outlet port 16. The fuel rail device characterized such that a fuel distributor block 18 fitted to at least one outlet port 16 of the rail 12. The fuel distributor block 18 has a one inlet port 18a and at least two outlet ports 18b and 18c.

[0008] The fuel distributor block 18 is fitted to the outlet port 16 of the rail 12 through an interface connector 20. The fuel distributor block 18 is fitted to the outlet port 18 and the interface connector 20 through a high pressure connector 22. The interface connector 20 can be defined as having two end, a first end 20a and second end 20b. The first end 20a of the interface connector 20 is fitted to the rail 12 through the threading that is provided on the internal surface of the interface connector which is in contact with the rail. The first end 20a is fitted to the at least one outlet port 16 of the rail. The second end 20b of the interface connector 20 has threading provided on the internal surface. The high pressure connector 22 has two end, a first end 22a and a second end 22b. The first end 22a of the high pressure connector 22 is fitted to the second end 20b of the interface connector through the threading that is provided on the outer surface of the high pressure connector 22. The second end 22b of the high pressure connector 22 has threading provided on the internal surface. The second end 22b of the high pressure connector 22 is fitted to the inlet port 18a of the fuel distributor block 18. The fuel distributor block has plurality of bores for the flow of fuel.

[0009] In accordance with another embodiment of the fuel distributor block 18, a pressure sensor fitted into the fuel distributor block 18. For fitting the pressure sensor a recess may be provided in the fuel distributor block 18.

[0010] Fuel rail device known in the state of art comprises a fuel rail which has one inlet port and multiple outlet ports. Fuel injectors are fitted to the multiple outlet ports, the pressurized fuel from the fuel rail is then delivered by the fuel injector to the engine. The fuel rail device 10 in accordance with this disclosure has a modular structure. Using the interface connector 20 and the high pressure connector 22, it is possible to use the conventional rail and extend the functionality to a engine with a large number of cylinders. The interface connector 20 and high pressure connector 22 make sure that there is no need to make any changes to the existing outlet ports of the rail. No new forging would be required to accommodate the interface connector 20 onto the at least one outlet port 16 of the rail 12. The high pressure connector 22 also makes sure that there is no loss in pressure when the fuel flows from the rail 12 to the fuel distributor block. The technical effect of using the fuel rail device 10 with the fuel distributor block 18, the interface connector 20 and the high pressure connector 22 is that this concept allows for easy multiplication of the high pressure ports without comprising on the pressure of the fuel that is finally delivered from the fuel distributor block 18 to any injector that may be connected to the outlet ports of the fuel distributor block 18.

[0011] 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