Claims:1. A high pressure fuel pump (10), said high pressure fuel pump (10) comprising:
a housing (12);
10 a plunger (14) positioned within said housing (12), said plunger (14) adapted
to reciprocate within said housing (12);
a vertical groove (16) defined in said plunger (14), said vertical groove (16)
adapted to extend along a sidewall of said plunger (14);
a helix groove (18) in flow communication with the vertical groove (16) and
15 extending angularly along a sidewall of said plunger (14); characterized in that
a slit shaped groove (20), an end of the slit shaped groove (20) in flow
communication with the vertical groove (16) and extending angularly along a
circumference of said plunger (14) such that an angle between the slit shaped
groove (20) and a horizontal axis is smaller than an angle between the helix
20 groove (18) and the horizontal axis, and wherein a width of the slit shaped
groove (20) is narrower than a width of the helix groove (18).
2. The high pressure fuel pump (10) in accordance with Claim 1, wherein the slit
shaped groove (20) extends angularly from the vertical groove (16) that is
25 defined in the plunger (14) and culminates at a termination of the helix groove
(18).
3. The high pressure fuel pump (10) in accordance with Claim 1, wherein a depth
of the slit shaped groove (20) along the along the circumference of the plunger
30 14 is lesser than a corresponding depth of the helix groove (18). , Description:A high pressure fuel pump 10 is described. The high pressure fuel pump 10 comprises
a housing 12. A plunger 14 is positioned within the housing 12. A vertical groove 16
is defined in the plunger 14. The vertical groove 16 extends along a sidewall of the
10 plunger 14. A helix groove 18 is in flow communication with the vertical groove 16,
and extends angularly along a sidewall of the plunger 14. A slit shaped groove 20, an
end of which is in flow communication with the vertical groove 16 and extends
angularly along a circumference of the plunger 14 such that an angle between the slit
shaped groove 20 and a horizontal axis is smaller than an angle between the helix
15 groove 18 and the horizontal axis. A width of the slit shaped groove 20 is narrower
than a width of the helix groove 18.