Axial piston pump with port plate having balance feed aperture relief feature

Patent metadata

Field	Value
Publication number	US-11236736-B2
Application number	US-201916586672-A
Country	US
Kind code	B2
Filing date	Sep 27, 2019
Priority date	Sep 27, 2019
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

A piston pump includes a ported member that is moveably disposed within an internal space of a housing between a rotating group and the housing. The ported member includes a first face facing the rotating group and a second face facing a fluid inlet and outlet. The ported member includes an intake port and a discharge port. Moreover, the ported member includes a balance aperture configured to pass fluid between the biasing member and a pump chamber as the rotating group rotates within the internal space such that the biasing member biases the ported member toward a balanced position within the internal space. The balance aperture has a rim at the first face. The rim is clefted at a relief feature of the first face. The relief feature is recessed into the first face.

First claim

What is claimed is:

1. A piston pump configured to displace a fluid comprising:
a housing that defines an internal space, the housing having a fluid inlet into the internal space, the housing having a fluid outlet out of the internal space;
a rotating group that is supported for rotation within the internal space of the housing, the rotating group including a rotor member with a bore therein and a piston supported for movement within the bore as the rotating group rotates to change a volume of a pump chamber that is cooperatively defined by the piston and the rotor member;
a biasing member; and
a ported member that is moveably disposed within the internal space of the housing between the rotating group and the housing, the ported member including a first face facing the rotating group and a second face facing the fluid inlet and the fluid outlet, the ported member including an intake port that fluidly connects the fluid inlet and the pump chamber as the rotating group rotates within the internal space, the ported member including a discharge port that fluidly connects the pump chamber and the fluid outlet as the rotating group rotates within the internal space, the ported member including a balance aperture configured to pass fluid between the biasing member and the pump chamber as the rotating group rotates within the internal space such that the biasing member biases the ported member toward a balanced position within the internal space;
the balance aperture having a rim at the first face, the rim having a leading side and a trailing side, the rotating group supported for rotation in a direction in which the piston moves across the leading side before the trailing side, the rim being clefted at a relief feature of the first face, the relief feature recessed into the first face and disposed on the trailing side of the rim;
the rim including a rounded portion with a first end and a second end that are separated by a junction portion of the relief feature; and
the relief feature having a width that gradually expands as the relief feature spans across the first face and away from junction portion.

2. The piston pump of claim 1 , wherein the relief feature has an outer boundary that intersects the rim at the first end and the second end; and wherein the relief feature has a depth that gradually increases as the relief feature spans away from the outer boundary toward an interior area of the relief feature.

3. The piston pump of claim 2 , wherein the depth gradually increases in a first direction and a second direction as the relief feature spans away from the outer boundary toward the interior area of the relief feature; and
wherein the first direction and the second direction are perpendicular and directed across the first face.

4. The piston pump of claim 2 , wherein the depth of the relief feature is greatest at the junction portion of the relief feature.

5. The piston pump of claim 1 , wherein the rotating group is supported for rotation about an axis;
wherein the biasing member is a first biasing member, wherein the balance aperture is a first balance aperture, wherein the rim is a first rim, and the relief feature is a first relief feature;
further comprising a second biasing member;
wherein the ported member further includes a second balance aperture configured to pass fluid between the second biasing member and the pump chamber as the rotating group rotates within the internal space such that the second biasing member biases the ported member toward the balanced position within the internal space as the rotating group rotates therein;
wherein the second balance aperture has a second rim at the first face, the second rim being clefted at a second relief feature of the first face, the second relief feature recessed into the first face;
wherein the first balance aperture is disposed circumferentially between the intake port and the discharge port on a first side of the axis; and
wherein the second balance aperture is disposed circumferentially between the intake port and the discharge port on a second side of the axis.

6. The piston pump of claim 1 , wherein the fluid is an engine fuel.

7. The piston pump of claim 1 , wherein the rotor member and the piston are configured as an axial piston pump.

8. A piston pump configured to displace a fluid comprising:
a housing that defines an internal space, the housing having a fluid inlet into the internal space, the housing having a fluid outlet out of the internal space;
a rotating group that is supported for rotation within the internal space of the housing, the rotating group including a rotor member with a bore therein and a piston supported for movement within the bore as the rotating group rotates to change a volume of a pump chamber that is cooperatively defined by the piston and the rotor member;
a biasing member; and
a ported member that is moveably disposed within the internal space of the housing between the rotating group and the housing, the ported member including a first face facing the rotating group and a second face facing the fluid inlet and the fluid outlet, the ported member including an intake port that fluidly connects the fluid inlet and the pump chamber as the rotating group rotates within the internal space, the ported member including a discharge port that fluidly connects the pump chamber and the fluid outlet as the rotating group rotates within the internal space, the ported member including a balance aperture configured to pass fluid between the biasing member and the pump chamber as the rotating group rotates within the internal space such that the biasing member biases the ported member toward a balanced position within the internal space;
the balance aperture having a rim at the first face, the rim being clefted at a relief feature of the first face, the relief feature recessed into the first face;
wherein the rim includes a rounded portion with a first end and a second end that are separated by a junction portion of the relief feature;
wherein the relief portion has an outer boundary that intersects the rim at the first end and the second end; and
wherein the outer boundary is shaped as a rounded lobe of the rim, with the outer boundary expanding in width as the relief feature spans in a direction away from the rim; and
wherein the relief feature has a width that gradually increases as the relief feature spans in a direction away from the outer boundary toward the junction portion.

9. The piston pump of claim 8 , where in the rounded portion is semi-circular.

10. The piston pump of claim 8 , wherein the rounded portion is centered about an axis; and
wherein the relief feature is symmetrical with respect to a line of symmetry that extends along the first face and through the axis.

11. The piston pump of claim 8 , wherein the rounded portion is centered about a first axis;
wherein the relief feature includes a central zone that extends along a second axis that extends transverse to the first axis;
wherein the relief feature includes a first side zone and a second side zone that are disposed on opposite sides of the central zone; and
wherein a depth of the relief feature is greater at the central zone than at the first and second side zones.

12. The piston pump of claim 8 , wherein the rim of the balance aperture has a leading side and a trailing side;
wherein the rotating group is supported for rotation in a direction in which the piston moves across the leading side before the trailing side; and
wherein the relief feature is disposed on the trailing side of the rim.

13. The piston pump of claim 8 , wherein the rotating group is supported for rotatio

Assignees

• Honeywell Int Inc

Inventors

• Parsons Abigail
• Rowan William Scott
• Portolese Larry

Classifications

• F04B11/0091 Primary

  using a special shape of fluid pass, e.g. throttles, ducts · CPC title

• F04B1/2021

  characterised by the contact area between cylinder barrel and valve plate · CPC title

• F04B1/20

  having rotary cylinder block · CPC title

• F04B1/2064

  Housings · CPC title

• F04B1/2007

  Arrangements for pressing the cylinder barrel against the valve plate, e.g. by fluid pressure · CPC title