Claims:1. A high pressure fuel pump, said high pressure fuel pump comprising:
10 a housing, and a plunger adapted to reciprocate within a pumping chamber
defined within said housing;
a roller tappet (10) secured to an end of said plunger, said roller tappet (10)
comprising:
a roller tappet body (12);
15 a roller (14) positioned within said roller tappet body (12), and secured
between a first end portion (16) of said roller tappet body (12) and a
second end portion (18) of said roller tappet body (12);
a bearing pin (20) inserted within a bore defined within said roller (14)
and within a bore defined within said roller tappet body (12), said
20 bearing pin (20) adapted to secure said roller (14) to said roller tappet
body (12), and a retainer ring (22) adapted to secure said bearing pin
(20) to said roller (14);
a bore (24) defined through said roller tappet body (12), the bore (24)
adapted to deliver lubrication oil to said roller (14) positioned within
25 said roller tappet body (12), the lubrication oil adapted to lubricate an
interface between said roller (14) and said roller tappet body (12);
characterized in that
a perforated plate (26) positioned between the bore (24) defined
through said roller tappet body (12) and said roller (14) positioned
30 within said roller tappet body (12), said perforated plate (26) adapted
to channel lubrication oil from the bore (24) defined through said roller
tappet body (12) and therein deliver the lubrication 5 oil to said roller
(14) positioned within said roller tappet body (12).
2. The high pressure fuel pump in accordance with Claim 1 wherein said
perforated plate (26) extends from a first end (28) of said roller tappet body
10 (12) to a second end (30) of said roller tappet body (12), and is adapted to
deliver lubrication oil to said roller (14) positioned within said roller tappet
body (12).
3. The high pressure fuel pump in accordance with Claim 2 wherein said
15 perforated plate (26) comprises a plurality of circular shaped holes (32) defined
from a first end of said perforated plate (26) to an opposite second end of said
perforated plate (26), wherein the plurality of circular shaped holes (32) is
adapted to channel lubrication oil from the bore (24) defined through said roller
tappet body (12) and therein deliver the lubrication oil to said roller (14)
20 positioned within said roller tappet body (12) such that lubrication oil flows
through the opposing interfaces between said roller (14) and said roller tappet body (12).
4. The high pressure fuel pump in accordance with Claim 2 wherein said
25 perforated plate (26) comprises a plurality of circular shaped holes (32) defined
from a first end of said perforated plate (26) to an opposite second end of said
perforated plate (26), wherein the plurality of circular shaped holes is
concentrated on a first side than on an opposite second side with reference to a
longitudinal axis of said perforated plate (26) to channel lubrication oil from
30 the bore (24) defined through said roller tappet body (12) and therein deliver
the lubrication oil to said roller (14) positioned within said roller tappet body
(12) such that a higher volume of lubrication oil flows to the first end portion
(16) of said roller tappet body (12) as compared to the opposing 5 second end
portion (18) of said roller tappet body (12).
5. The high pressure fuel pump in accordance with Claim 2 wherein said
perforated plate (26) comprises a plurality of circular shaped holes (32) defined
10 from a first end of said perforated plate (26) to an opposite second end of said
perforated plate (26), wherein the plurality of circular shaped holes has a
greater diameter on the side facing the roller tappet body (12), and wherein the
plurality of circular shaped holes has a smaller diameter on the side facing the
roller (14) to channel lubrication oil from the bore (24) defined through said
15 roller tappet body (12) and therein deliver the lubrication oil to said roller (14)
positioned within said roller tappet body (12) such that lubrication oil is
delivered at a greater velocity from the side facing the roller (14) in contrast to
the side facing the roller tappet body (12) through the opposing interfaces of
said perforated plate between said roller (14) and said roller tappet body (12).
6. The high pressure fuel pump in accordance with Claim 2 wherein said
perforated plate (26) comprises a plurality of circular shaped holes defined
from a first end of said perforated plate (26) to an opposite second end of said
perforated plate (26), wherein the plurality of circular shaped holes are
25 misaligned with reference to a vertical axis of said perforated plate (26) to
channel lubrication oil from the bore (24) defined through said roller tappet
body (12) and therein deliver the lubrication oil to said roller (14) positioned
within said roller tappet body (12) such that lubrication oil is delivered at an
angle to ensure that a greater quantity of lubrication oil is delivered to the first
30 end portion (16) of said roller tappet body (12) as compared to the opposing
second end portion (18) of said roller tappet body (12).
7. The high pressure fuel pump in accordance with Claim 5 2 wherein said
perforated plate (26) is inclined with reference to a horizontal axis of said
perforated plate (26) to ensure that a greater quantity of lubrication oil is
delivered to the first end portion (16) of said roller tappet body (12) as
compared to the opposing second end portion (18) of said roller tappet body
10 (12). , Description:A high pressure fuel pump is described. The high pressure fuel pump comprises a
housing, and a plunger reciprocates within the housing. A roller tappet 10 is secured
to an end of the plunger, the roller tappet 10 comprising a roller tappet body 12, and a
10 roller 14 positioned within the roller tappet body 12. A bore 24 is defined through the
roller tappet body 12, the bore 24 adapted to deliver lubrication oil to the roller 14
positioned within the roller tappet body 12. A perforated plate 26 is positioned between
the bore 24 defined through the roller tappet body 12 and the roller 14 positioned
within the roller tappet body 12, the perforated plate 26 adapted to channel lubrication
15 oil from the bore 24 defined through the roller tappet body 12 and therein deliver the
lubrication oil to the roller 14 positioned within the roller tappet body 12.