Pumps – Three or more cylinders arranged in parallel – radial – or...
Reexamination Certificate
2001-09-27
2003-12-09
Paik, Sang Y. (Department: 3742)
Pumps
Three or more cylinders arranged in parallel, radial, or...
C417S454000, C417S571000
Reexamination Certificate
active
06659734
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a high-pressure pump with improved sealing.
It applies in particular to a high-pressure pump for supplying a motor vehicle internal combustion engine with fuel. In this case, the transferred liquid is the fuel.
BACKGROUND OF THE INVENTION
The state of the art already discloses a high-pressure pump for pumping a first liquid, known as the transferred liquid, of the type comprising a main unit for pumping the transferred liquid and actuated by a secondary unit for pumping a second liquid, known as the working liquid, and of the type comprising a housing of cylindrical overall shape, in which the main and secondary units are arranged, the main unit comprising at least two valves, namely an intake valve and a delivery valve for the transferred liquid, carried by a valve body housed in the housing, each valve communicating with two chambers, namely an intake chamber and a delivery chamber for the transferred liquid, delimited by opposing surfaces of cylindrical overall shape, of axis coinciding more or less with that of the housing, formed in the valve body and in the housing.
BRIEF DESCRIPTION OF THE INVENTION
A pump of this type is described, for example, in WO 97/47883.
In the pump described in that document, the intake and delivery chambers connected to the valves are separated by a rubber O-ring seal. This seal, housed in an annular groove formed in a peripheral surface of the valve body, is relatively bulky.
A particular object of the invention is to propose a high-pressure pump, of the aforementioned type, equipped with means which are effective and not very bulky for separating the intake and delivery chambers.
To this end, the subject of the invention is a high-pressure pump of the aforementioned type, characterized in that the opposing surfaces comprise two complementary shoulders bearing on one another so as to form a sealed joining plane separating the intake and delivery chambers.
According to other features of the invention:
the housing comprises a body and a cover forming the respective two opposite ends of this housing, the housing body being connected to the cover by at least one screw more or less parallel to the axis of the housing, having a head bearing on a seat formed in the housing body, and a threaded body screwed into a tapped orifice in the cover, the pump additionally comprising an intermediate assembly clamped axially between a skirt of the housing body, internal to the cover, and the valve body so that the housing body, the intermediate assembly and the valve body are clamped between the head of the screw and the joining plane;
the intermediate assembly comprises a body in which a piston of the secondary unit is mounted so that it can slide, this piston being intended to compress the working liquid;
the housing and the valve body are made of a lightweight metal such as aluminum or of an aluminum-based alloy;
the intermediate assembly is made of steel or cast iron and the screw is made of steel, the axial dimension of the intermediate assembly being more or less equal to the length (L
2
) of the part of the body of the screw extending between the head of this screw and the tapped orifice of the cover; and
the transferred liquid is a fuel for a motor vehicle internal combustion engine.
REFERENCES:
patent: 2664048 (1953-12-01), Huber
patent: 3692052 (1972-09-01), Cattanach
patent: 4594058 (1986-06-01), Fischell
patent: 4792287 (1988-12-01), Alaze et al.
patent: 4878815 (1989-11-01), Stachowiak
patent: 4993925 (1991-02-01), Becker et al.
patent: 5241986 (1993-09-01), Yie
patent: 5601345 (1997-02-01), Tackett
patent: 5707219 (1998-01-01), Powers
patent: 5899671 (1999-05-01), Horn
patent: 6095774 (2000-08-01), Tanaka et al.
patent: 6213096 (2001-04-01), Kato et al.
patent: 6439859 (2002-08-01), de Matthaeis et al.
patent: 466 045 (1969-01-01), None
patent: 860429 (1941-01-01), None
patent: WO 97/47883 (1997-12-01), None
Paik Sang Y.
Patel Vinod D.
Peugeot Citroen Automobiles SA
LandOfFree
High-pressure pump with improved sealing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High-pressure pump with improved sealing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-pressure pump with improved sealing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3115062