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US 12,092,103 B2Granted
Fuel pump with determinant translating cam arrangement
AssigneeEaton Intelligent Power Limited
InventorMartin Augustine Clements
Life of this patent
Estimating the term…
Abstract
A fuel pump includes a cam arrangement surrounding a rotor and disposed within a spacer ring. The cam arrangement is configured to deterministically translate relative to the spacer ring and the rotor during stroking of the pump. An involute gear set provides an interface between the cam arrangement and the spacer ring. In some cases, the involute gear set is configured to provide a linear translation of the cam arrangement along a timing line. In other cases, the involute gear set is configured to provide a linear translation of the cam arrangement at an angle relative to the timing line.
Claims21
A fuel pump comprising:
- a housing having a pump chamber, an inlet in fluid communication with the pump chamber, and an outlet in fluid communication with the pump chamber;
- a spacer ring fixedly mounted to the housing;
- a rotor disposed in the pump chamber;
- a cam arrangement radially interposed between the rotor and the spacer ring, the cam arrangement engaging the spacer ring at an interface at which the cam arrangement rolls relative to the spacer ring between a zero displacement position and a full displacement position;
- an involute gear set defining the interface between the cam arrangement and the spacer ring, the involute gear set including a first part formed by the cam arrangement and a second part formed by the spacer ring;
- and
- an actuator configured to roll the cam arrangement relative to the spacer ring to selectively vary pump output while maintaining a center point of the cam arrangement along a linear translation axis;
- wherein one of the first and second parts includes an involute tooth and the other of the first and second parts includes a notch sized to receive the involute tooth, and the involute tooth has peripheral sides each having an involute curve.
5 more elements
A fuel pump comprising:
- a housing arrangement defining a pump chamber, the housing arrangement including a port plate defining a plurality of inlet ports and a plurality of outlet ports disposed at opposite sides of a timing line;
- a spacer ring fixedly mounted to the port plate;
- a rotor disposed in the pump chamber and configured to rotate relative to the spacer ring, the rotor including a plurality of outwardly extending vanes;
- a cam arrangement radially interposed between the rotor and the spacer ring, the cam arrangement engaging the spacer ring at an interface at which the cam arrangement rolls relative to the spacer ring between a zero displacement position and a full displacement position, the cam arrangement cooperating with the vanes to define pumping chambers, the cam arrangement having a center point that moves along a translation axis as the cam arrangement moves between the zero displacement position and the full displacement position, and the interface being configured so that the translation axis is angled relative to the timing line;
- an actuator configured to roll the cam arrangement relative to the spacer ring to selectively vary pump output;
- and
- an involute gear set defining the interface between the cam arrangement and the spacer ring, the involute gear set including a first part formed by the cam arrangement and a second part formed by the spacer ring;
- wherein one of the first and second parts includes an involute tooth and the other of the first and second parts includes a notch sized to receive the involute tooth, and the involute tooth has peripheral sides each having an involute curve.
5 more elements
A fuel pump comprising:
- a housing having a pump chamber, an inlet in fluid communication with the pump chamber, and an outlet in fluid communication with the pump chamber;
- a spacer ring fixedly mounted to the housing;
- a rotor disposed in the pump chamber;
- a cam arrangement radially interposed between the rotor and the spacer ring, the cam arrangement engaging the spacer ring at an interface at which the cam arrangement rolls relative to the spacer ring between a zero displacement position and a full displacement position;
- an involute gear set defining the interface between the cam arrangement and the spacer ring, the involute gear set including a first part formed by the cam arrangement and a second part formed by the spacer ring;
- an actuator configured to move the cam arrangement relative to the spacer ring to selectively vary pump output during a pump stroke;
- and
- wherein one of the first and second parts includes an involute tooth and the other of the first and second parts includes a notch sized to receive the involute tooth, and the involute tooth has peripheral sides each having an involute curve.
5 more elements
A fuel pump comprising:
- a housing having a pump chamber, an inlet in fluid communication with the pump chamber, and an outlet in fluid communication with the pump chamber;
- a spacer ring fixedly mounted to the housing;
- a rotor disposed in the pump chamber;
- a cam arrangement radially interposed between the rotor and the spacer ring, the cam arrangement engaging the spacer ring at an interface at which the cam arrangement rolls relative to the spacer ring between a zero displacement position and a full displacement position;
- an involute gear set defining the interface between the cam arrangement and the spacer ring, the involute gear set including a first part formed by the cam arrangement and a second part formed by the spacer ring;
- an actuator configured to roll the cam arrangement relative to the spacer ring to selectively vary pump output while maintaining a center point of the cam arrangement along a linear translation axis;
- wherein the first part includes a tooth and the second part includes a notch, or wherein the first part includes a notch and the second part includes a tooth, and wherein the tooth includes peripheral sides;
- wherein the notch includes a well, the tooth includes a truncated tip, and the tip is configured not to extend into the well;
- and wherein the tooth includes an undercut at at least one of the peripheral sides, the notch includes a corner on a linear notch wall, and the undercut is configured to accommodate the corner.
6 more elements
Dependencies are inferred from the claim text.