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 first helix groove (18) in flow communication with the vertical groove (16)
15 and extending angularly along a sidewall of said plunger (14); characterized in
that
a secondary helix groove (20) in flow communication with the first helix
groove (18) and extending partially along a circumference of said plunger (14),
wherein a width of the secondary helix groove (20) is lesser than a width of the
20 first helix groove (18), and wherein a depth of the secondary helix groove (20)
is lesser than a depth of the first helix groove (18).
2. The high pressure fuel pump (10) in accordance with Claim 1, wherein the
secondary helix groove (20) extends from the vertical groove (16) that is
25 defined on the plunger (14) to a portion before an end of the first helix groove
(18), and culminates prior to a termination of the first helix groove (18).
3. The high pressure fuel pump (10) in accordance with Claim 1, wherein a length
of the secondary helix groove (20) is lesser than a length of the first helix
30 groove (18), and wherein the first helix groove (18) and the secondary helix
groove (20) have a common boundary defined between the first helix groove
(18) and the secondary helix groove (20).
4. The high pressure fuel pump (10) in accordance with 5 Claim 1, further
comprising a tertiary helix groove (22) in flow communication with the first
helix groove (18) and extending partially along a circumference of said plunger
(14), wherein a width of the tertiary helix groove (22) is lesser than a width of
the first helix groove (18), and wherein a depth of the tertiary helix groove (22)
10 is lesser than a depth of the first helix groove (18).
5. The high pressure fuel pump (10) in accordance with Claim 4, wherein the
tertiary helix groove (22) extends from the vertical groove (16) that is defined
on the plunger (14) to an end of the first helix groove (18), and culminates at a
15 termination of the first helix groove (18).
6. The high pressure fuel pump (10) in accordance with Claim 4, wherein a length
of the tertiary helix groove (22) is equal to a length of the first helix groove
(18), and wherein the first helix groove (18) and the tertiary helix groove (22)
20 have a common boundary defined between the first helix groove (18) and the
tertiary helix groove (22).
7. The high pressure fuel pump (10) in accordance with Claim 4, wherein the
secondary helix groove (20) comprises a first pitch, and the tertiary helix
25 groove (22) comprises a second pitch, wherein an angle of the second pitch of
the tertiary helix groove (22) is greater than an angle of the first pitch of the
secondary helix groove (20). , Description:A high pressure fuel pump 10 is described. The high pressure fuel pump 10 comprises
a housing 12, and a plunger 14 positioned within the housing 12. The plunger 14 is
adapted to reciprocate within the housing 12. A vertical groove 16 is defined in the
10 plunger 14, the vertical groove 16 adapted to extend along a sidewall of the plunger
14. A first helix groove 18 is in flow communication with the vertical groove 16, and
extends angularly along a sidewall of the plunger 14. A secondary helix groove 20 is
in flow communication with the first helix groove 18, and extends partially along a
circumference of the plunger 14. A width of the secondary helix groove 20 is lesser
15 than a width of the first helix groove 18. A depth of the secondary helix groove 20 is
lesser than a depth of the first helix groove 18.