Flow and pressure ripple reduction with advance dual gear and bearing face cut
AssigneeHamilton Sundstrand Corporation
InventorWeishun Ni
Life of this patent
Estimating the term…
Abstract
An aircraft turbine engine Fuel Metering Unit (FMU) is provided including a main gear pump having a main drive gear and a main driven gear and a servo gear pump having a servo drive gear and a servo driven gear. The main drive gear and the servo drive gear are received on an input shaft. The main driven gear is mounted to a first shaft oriented parallel to and adjacent a first side of the input shaft. The main driven gear is in meshing engagement with the main drive gear. The servo drive gear is mounted to a second shaft arranged parallel to and adjacent a second, opposite side of the input shaft. The servo driven gear is in meshing engagement with the servo drive gear.
Claims20
A main gear pump comprising:
- a drive gear including a plurality of drive gear teeth;
- a driven gear including a plurality of driven gear teeth wherein the driven gear is spaced apart from the drive gear such that the driven gear teeth and the drive gear teeth are in meshing engagement;
- at least one drive bearing arranged next to the drive gear such that a surface of the drive bearing facing the drive gear includes a first relief and a second relief;
- at least one driven bearing positioned next to the driven gear such that a surface of the driven bearing facing the driven gear includes a third relief and a fourth relief;
- and
- wherein the drive gear has 15 drive gear teeth and the driven gear has 13 driven gear teeth, and both the drive gear and the driven gear have a width of about 0.6635 inches (1.685 cm) such that the drive gear has a width to outer diameter ratio of about 0.321, and the width to outer diameter ratio of the driven gear is about 0.364.
A servo gear pump comprising:
- a drive gear including a plurality of drive gear teeth;
- a driven gear including a plurality of drive gear teeth wherein the driven gear is spaced apart from the drive gear such that the driven gear teeth and the drive gear teeth are in meshing engagement;
- at least one drive bearing arranged next to the drive gear such that a surface of the drive bearing facing the drive gear includes a first relief and a second relief;
- at least one driven bearing positioned next to the driven gear such that a surface of the driven bearing facing the driven gear includes a third relief and a fourth relief;
- and
- wherein the drive gear and the driven gear are identical, and have a width of about 0.57 inches (1.45 cm) such that the drive gear and driven gear have a width to outer diameter ratio of about of about 0.329.
Dependencies are inferred from the claim text.