Claims:1. A high pressure fuel pump (10), said high pressure fuel pump (10) comprising:
10 a housing (12);
a element (14) positioned within said housing (12), said element (14) adapted
to reciprocate within said housing (12);
a vertical groove (16) defined in said element (14), the vertical groove (16)
adapted to extend along a sidewall of said element (14); characterized in that
15 a reverse helix groove (18) in flow communication with the vertical groove
(16) and extending angularly along a sidewall of said element (14), the reverse
helix groove (18) extending upwardly towards a top of said element (14) from
the vertical groove (16) at one end to an opposite second end of the reverse
helix groove (18) at its opposite second end.
2. The high pressure fuel pump (10) in accordance with Claim 1, wherein a depth
of the reverse helix groove (18) from the top of said element (14) is maximum
adjacent to the vertical groove (16), and wherein the depth of the reverse helix
groove (18) from the top of said element (14) is minimum at the opposite
25 second end of the reverse helix groove (18).
3. The high pressure fuel pump (10) in accordance with Claim 1, wherein a top
portion of the reverse helix groove (18) that is adjacent the top of said element
(14) extends upwardly towards a top of said element (14) from the vertical
30 groove (16) at one end to the opposite second end of the reverse helix groove
(18) at its opposite second end.
4. The high pressure fuel pump (10) in accordance with 5 Claim 1, wherein a
bottom portion of the reverse helix groove (18) that is farthest away from the
top of said element (14) extends upwardly towards a top of said element (14)
from the vertical groove (16) at one end to the opposite second end of the
reverse helix groove (18) at its opposite second end. , Description:A high pressure fuel pump 10 is described. The high pressure fuel pump 10 comprises
a housing 12, and a element 14 positioned therein. A vertical groove 16 is defined in
the element 14, and extends along its sidewall. A reverse helix groove 18 is in flow
10 communication with the vertical groove 16, and extends angularly along a sidewall of
the element 14. The reverse helix groove 18 extends upwardly towards a top of the
element 14 from the vertical groove 16 at one end to an opposite second end of the
reverse helix groove 18. A depth of the reverse helix groove 18 from the top of the
element 14 is maximum adjacent to the vertical groove 16, and wherein the depth of
15 the reverse helix groove 18 from the top of the element 14 is minimum at the opposite
second end of the reverse helix groove 18.