Claims:1. A high pressure pump (10), said pump (10) comprising
- a plunger (12) positioned in a barrel (14), one end of said plunger (12) is
connected to a CAM (16);
characterized 5 in that:
- an inlet (18) made on said barrel (14), such that, said inlet (18) has a noncircular
shape, and an axial diameter 18(a) of said inlet (18) is longer/
lengthier than a radial diameter 18(b) of said inlet (18).
2. The high-pressure pump (10) as claimed in claim 1, wherein a geometrical shape
of said inlet (18) is chosen from a group of geometrical shapes comprising an
elliptical, an oval, and a polygonal.
3. The high-pressure pump (10) as claimed in claim 1, wherein said inlet (18)
15 comprises a top edge point (20), such that said plunger (12) adapted move faster
to reach said top edge point (20) of said inlet (18) during a pre-stroke.
4. The high-pressure pump (10) as claimed in claim 1, wherein said inlet (18)
comprises conjugate diameters.
20
5. The high-pressure pump (10) as claimed in claim 4, wherein a width of said inlet
(18) is made in such a way that, said pre-stroke is reduced.
6. The high-pressure pump (10) as claimed in claim 1, wherein a distance between
25 said top edge point (20) of said inlet (18) and a shoulder point (22) of said barrel
(14) is maintained constant.
7. A method of working of said high pressure pump (10),
said pump (10) comprising:
- a plunger (12) positioned in a barrel (14) and one end of said plunger (12)
is connected to a CAM (16);
- a non-circular inlet (18) for flow of fuel into said barrel (14);
said method comprising:
- opening said inlet (18) of said pump (10) for flow of said fuel by moving said
plunger (12) from a top dead center to a bottom dead center;
- operating said CAM (16) for moving said plunger (12) from 5 said bottom dead
center upon receiving said fuel into said barrel (14);
- reducing a pre-stroke of said plunger (12) by having said non-circular inlet
(18), such that, moving said plunger (12) faster to reach a top edge point (20)
of said inlet (18) during said pre-stroke. , Description:The high-pressure pump 10 comprises a plunger 12 positioned in a barrel 14. One end
of the plunger 12 is connected to a CAM 16. The high-pressure pump 5 10 comprises an
inlet 18 made on the barrel 14, such that, the inlet 18 has a non-circular shape, and an
axial 18(a) of the inlet 18 is longer/lengthier than a radial diameter 18(b) of the inlet 18.
With the above-disclosed non-circular inlet 18 of the barrel 14, the pre-stroke is reduced.
Reducing the pre-stroke benefits in providing a better CAM 16-load safety. The reduced
10 pre-stroke is helpful in meeting certain engine requirements depending on the static
injection timing setting required.
(Figure 1)