Claims:We Claim

1. A fuel injector (100) comprising
- an injector body (110);
- a fuel inlet (105) located on said injector body(110);
- a nozzle body(115) abutting one end(110a) of said injector body(110);
- a first fuel path(120a) extending from said fuel inlet(105) through said injector body(110) towards said nozzle body (115);
- a first bar filter (130) located in said first fuel path (120a) in proximity to said fuel inlet(105);
- a second fuel path (120b) extending through said nozzle body (115) towards a nozzle needle (125)
Characterized in that
- a second bar filter (200) located in one part of said first fuel path (120a) in a manner such that said bar filter (200) is located in proximity of the second fuel path (120b).

2. The fuel injector (100) as claimed in claim 1, wherein said second bar filter (200) comprises
- a first end (205) in proximity to the said fuel inlet(105),
- a second end(210) in proximity to said nozzle needle(125),
- at least six flutes(220,225) engraved on said second bar filter(200),
- at least three blind holes(230) made on said flutes (220) of said second bar filter(200).
3. The fuel injector (100) as claimed in claim 1, wherein said first end (205) of said bar filter (200) has at least three flutes (220) originating from said first end (205) of said second bar filter (200) and at least three flutes (225) originating from said second end (210) of said second bar filter (200).
4. The fuel injector (100) as claimed in claim 1, wherein said blind holes (230) are made on said flutes (220) originating from said first end (205) of said second bar filter (200).
, 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] The present disclosure relates to a fuel injector and more specifically to an additional second bar filter for a fuel injector.

Background of the invention

[0002] Particles in the fuel are the primary cause of failure of the injector components. The particle retention capacity is currently limited, and any trapped particles can break into smaller pieces over time and enter the injector and through the injector, and significantly reduce the robustness of the injector and nozzle over the life of the injector. A filter is used in the fuel injector to prevent particles/impurities from being injected into the engine cylinders along with the fuel. Present day fuel injectors have one bar filter placed in the fuel inlet of the fuel injector.

[0003]The bar filter includes a groove through which fuel enters the filter and then flows to the edge of the groove. The edges of the overlapping V-shaped flow channels help split the particles into smaller pieces. These smaller pieces of particles enter the inside of the injector and nozzle and affect the functionality of the injector.

[0004] Over a period of time the hydraulic flow of the nozzle may increase due to particle erosion at nozzle spray hole region. This may lead to black smoke due to unburnt combustion and consequently lead to high power generation by vehicle and therefore high emission. This causes piston melting due increase in combustion temperature. Therefore, it is desirable to prevent particles from entering the nozzle of the fuel injector.

Brief description of the accompanying drawings

[0001] [0005] Figure 1 is a representative illustration of a fuel injector (100) in accordance with an embodiment of our invention.
[0006] Figure 2 illustrates a sectional view of an embodiment of our invention

Detailed description of the invention

[0008] Figure 1 illustrates a fuel injector (100). The fuel injector (100) has a fuel inlet (105) for entry of high pressure fuel. The components of the fuel injector (100) are enclosed inside an injector body (110) that leads to a nozzle body (115) that abuts from one end (130) of the injector body (110). The fuel inlet (105) leads to a fuel path (120). The first part (120a) of the fuel path (120) stretches from the entire length of the injector body(110) to a part of the nozzle body(115) and the second part (120b) of the fuel path (120) stretches from the other part of the nozzle body(115) towards the nozzle needle (125). A bar filter (130) located in the first fuel path (120a) in proximity to the fuel inlet (105) already exists in prior art. The initial filtering of fuel happens in said bar filter (130). However this is not adequate. Micro particles escape this first bar filter (130) and make their way to the nozzle needle (125) which can corrode the nozzle needle (125). Therefore an additional second bar filter (200) is introduced in the said second fuel (120b) path in proximity to said nozzle needle.
The configuration of the second bar filter (200) will be explained in further detail. The second bar filter (200) is adapted to be positioned along the second part (120b) of the fuel path (120) in proximity to said nozzle needle (125). The second bar filter (200) includes a body (215) that is contoured such that it can be inserted into the second part (120b) of the fuel path (120) of the fuel injector (100). The body (215) includes at least six flutes (220,225) that are engraved on said body (215). There are at least three flutes (220) that originate from first end (205) of the second bar filter (200) which is in proximity to the fuel inlet (105) and three flutes (225) on the second end (210) of the second bar filter (200) which is in proximity to the nozzle needle (125). The aforementioned three engraved flutes (220) originating from the first end (205) have at least one blind hole (230) each on each flute (220). The flutes (220) enable particles to flow into the blind holes (230). The blind hole (230) is in the form of a hollow cavity, the contour of which is such that particles entering the blind hole (230) are captured within the blind hole (230) itself.
The operation of the second bar filter (200) located in the fuel injector (100) will be explained with reference to Figure 2. Fuel is received within the fuel injector (100) via a fuel inlet (105). The fuel inlet (105) is adapted to receive fuel from a high pressure fuel injection pump. Fuel enters the inlet (105) of the fuel injector (100), goes through the first bar filter (130) into the fuel path (120) and flows into the second bar filter (200) positioned along the second part (120b) of the fuel path (120). The second bar filter (200) includes a body (215) that includes at least six flutes (220,225). Fuel flows through the three flutes (220) that originate from the first end (205) of the said second bar filter (200). The finer particles flow with the fuel and impinge on the blind holes (230) on the three flutes (220) originating from the first end (205). The blind holes (230) work as a trap and an accumulator for the fuel particles thus filtering the fuel in the process. The filtered fuel then flows through the three other flutes (225) that originate from the second end (210) of the said second bar filter (200) and finally into the nozzle needle (125).
It should be understood that the embodiments explained in the above description are merely illustrative and do not limit the scope of the invention in terms of the type of filter/injector. Many other modifications and variations in the embodiments and the embodiments explained in the specification are contemplated. The scope of the invention is limited only by the scope of the claims