High pressure pump with pressurizing chamber enclosed within cylinder inserted into housing
AssigneesDenso Corporation, Nippon Soken, Inc.
InventorsTeppei Matsumoto, Masatoshi Kuroyanagi, Osamu Hishinuma
Life of this patent
Estimating the term…
Abstract
A cylinder is configured into a bottomed tubular form and includes an inner peripheral wall, an inner bottom wall, an outer peripheral wall and an intake hole and a discharge hole. The inner peripheral wall slidably guides the plunger. The intake hole and the discharge hole communicate between the inner peripheral wall and the outer peripheral wall. A pump housing includes a cylinder receiving hole that includes an inner peripheral wall, into which the cylinder is inserted. A pressurizing chamber is formed by the inner peripheral wall and the inner bottom wall of the cylinder and a distal end outer wall of the plunger.
Claims11
A high pressure pump comprising:
- a plunger that is adapted to reciprocate;
- a cylinder that is configured into a bottomed tubular form and includes:
- an inner peripheral wall that slidably guides the plunger;
- an inner bottom wall that is continuous from the inner peripheral wall, wherein the inner bottom wall is configured into a generally conical form, which has an increasing diameter toward the plunger;
- an outer peripheral wall;
- and
- an intake hole and a discharge hole, which communicate between the inner peripheral wall and the outer peripheral wall;
- and
- a pump housing that includes:
- a cylinder receiving hole that includes an inner peripheral wall, into which the cylinder is inserted, wherein the inner peripheral wall of the cylinder receiving hole contacts the outer peripheral wall of the cylinder;
- an intake passage that is communicated with the intake hole;
- and
- a discharge passage that is communicated with the discharge hole, wherein a pressurizing chamber is formed by the inner peripheral wall and the inner bottom wall of the cylinder and a distal end outer wall of the plunger upon installation of the cylinder and the plunger into the cylinder receiving hole, wherein
- the pump housing further includes:
- a first housing that is engaged with a bottom portion of the outer peripheral wall of the cylinder, which is located on a radially outer side of the inner bottom wall of the cylinder;
- and
- a second housing that is engaged with a tubular portion of the outer peripheral wall of the cylinder, which is located on a radially outer side of the inner peripheral wall of the cylinder;
- the cylinder has a limiting portion that limits movement of the cylinder toward the bottom portion of the cylinder relative to the housing when a pressure of the pressurizing chamber is increased;
- and
- the second housing is placed between and contact with the first housing and the limiting portion of the cylinder.
A high pressure pump comprising:
- a plunger that is adapted to reciprocate;
- a cylinder that is formed into a bottomed tubular form and includes a bottom portion and a tubular portion, wherein:
- the bottom portion closes one end of the tubular portion;
- the plunger is slidably supported by an inner wall of the tubular portion;
- a pressurizing chamber is formed by an upper end of the plunger, the inner wall of the tubular portion and an inner bottom wall of the bottom portion;
- and
- an intake hole and a discharge hole are formed through at least one of the bottom portion and the tubular portion to radially communicate between an inside and an outside of the pressurizing chamber;
- and
- a housing that is engaged with an outer wall of the bottom portion and an outer wall of the tubular portion, wherein:
- the housing includes:
- a first housing that is engaged with the outer wall of the bottom portion of the cylinder;
- and
- a second housing that is engaged with the outer wall of the tubular portion of the cylinder;
- the cylinder has a limiting portion that limits movement of the cylinder toward the bottom portion of the cylinder relative to the housing when a pressure of the pressurizing chamber is increased;
- and
- the second housing is placed between and contacts with the first housing and the limiting portion of the cylinder.
Dependencies are inferred from the claim text.