Pumps – Expansible chamber type – Biasing means effects induction stroke of abutment driven,...
Reexamination Certificate
2001-04-18
2003-03-11
Freay, Charles G. (Department: 3746)
Pumps
Expansible chamber type
Biasing means effects induction stroke of abutment driven,...
C417S555100, C417S505000, C417S559000, C092S168000, C277S436000, C277S437000
Reexamination Certificate
active
06530759
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a high pressure pump such as a high pressure fuel pump that supplies fuel to the fuel injector of a vehicle internal combustion engine.
Japanese Unexamined Patent Publication No. 8-68370 discloses a high pressure pump, which is illustrated in FIG.
4
.
As shown in
FIG. 4
, a cylinder
41
accommodates a plunger
42
. The plunger
42
extends through a plunger hole
41
b
formed in the cylinder
41
and is reciprocated by a lifter
43
. Reciprocation of the plunger
42
changes the volume of a pressurizing chamber (not show), which is defined in the cylinder
41
. Accordingly, fuel is pressurized.
A seal member
44
is located about the lower portion of the cylinder
41
to seal the space between the cylinder
41
and the lifter
43
. Specifically, a protrusion
41
a
is formed in the lower portion of the cylinder
41
. The protrusion
41
a
is press fitted into the upper opening of the seal member
44
. An annular lip portion
44
a
is formed in the lower portion of the seal member
44
. The plunger
42
extends through and slides on the lip portion
44
a
. Thus, fuel that leaks from the pressurizing chamber is prevented from being mixed with lubricant that lubricates the lifter
43
.
However, since the protrusion
41
a
of the cylinder
41
is press fitted into the upper opening of the seal member
44
, the cylinder
41
receives load due to the elastic force of the seal member
44
, which may deform the plunger hole
41
b.
The axes of the seal member
44
and the plunger
42
must be aligned with a high precision to guarantee a high sealing characteristic, which increases the cost of the cylinder
41
.
BRIEF SUMMARY OF THE INVENTION
Accordingly, it is an objective of the present invention to provide a high pressure pump the seal member of which is reliably installed and positioned outside of a cylinder.
To achieve the foregoing and other objectives and in accordance with the purpose of the present invention, a high pressure pump is provided. A plunger is reciprocally located in a pressurizing chamber that is formed in a cylinder. The plunger is reciprocated by a driving member and changes the volume of the pressurizing chamber thereby pressurizing fluid in the pressurizing chamber. The pump includes a seal member and a support. The seal member is located outside of the cylinder and seals the cylinder from the driving member thereby preventing fluid that leaks from the pressurizing chamber from being mixed with lubricant that lubricates the driving member. The support is formed separately from the cylinder and the seal member is attached to the support. The support is fixed to the cylinder with the plunger extending through the support.
Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
REFERENCES:
patent: 2804050 (1957-08-01), Spilling
patent: 3373695 (1968-03-01), Yohpe
patent: 3438638 (1969-04-01), Newcomb et al.
patent: 3503304 (1970-03-01), Comeau, Jr. et al.
patent: 3902404 (1975-09-01), Breit
patent: 4508020 (1985-04-01), Szcupak
patent: 4832352 (1989-05-01), Sjostedt
patent: 5567134 (1996-10-01), Inoue
patent: 5890415 (1999-04-01), Asou
Asayama Kazuhiro
Inoue Hiroshi
Sano Masaaki
Freay Charles G.
Kenyon & Kenyon
Solak Timothy P.
Toyota Jidosha & Kabushiki Kaisha
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