High efficiency gear pump

A gear pump for pressurizing and pumping fluid comprising:

• a pump housing having an inlet port section, and an outlet port section spaced from said inlet port section;
• a fluid pump chamber formed in said pump housing having first and second spaced endwalls;
• a meshed gear pumping assembly mounted in said fluid pump chamber between said inlet port section and said outlet port section to pump fluid from said inlet port section to said outlet port section, said meshed gear pumping assembly including a first shaft mounted for rotation on said pump housing to extend between said first and second spaced endwalls;
• a second shaft mounted on said pump housing to extend between said first and second spaced endwalls in substantially parallel spaced relationship to said first shaft;
• first and second pump gears coaxially mounted in said first shaft,
• a first separator unit secured to said first shaft between said first and second pump gears, said first shaft and first pump gear being formed to provide a drive connection and to mount said first pump gear for rotation with said first shaft and for free axial movement along said first shaft between said first separator unit and said first endwall and said first shaft and second pump gear being formed to provide a drive connection and to mount said second pump gear for rotation with said first shaft and for free axial movement along said first shaft between said first separator unit and said second endwall;
• third and fourth pump gears coaxially mounted for rotation on said second shaft to separately mesh with said first and second pump gears respectively;
• a second separator unit secured to said second shaft between said third and fourth pump gears, said second shaft and third pump gear being formed to mount said third pump gear for free axial movement along said second shaft between said second separator unit and said first endwall and said second shaft and fourth pump gear being formed to mount said fourth pump gear on said second shaft for free axial movement along said second shaft between said second separator unit and said second endwall, said first and second pump gears each includes an inner gear face with the inner gear face of said first pump gear being adjacent to the inner gear face of said second pump gear, the inner gear face of at least one of said first and second pump gears being formed with a first indented snap ring receiving chamber adjacent to said first shaft, said first separator unit including a first snap ring connected to said first shaft and received in said first indented snap ring receiving chamber, and said third and fourth pump gears each include an inner gear face with the inner gear face of said third pump gear being adjacent to the inner gear face of said fourth pump gear, the inner gear face of at least one of said third and fourth pump gears being formed with a second indented snap ring receiving chamber adjacent to said second shaft, said second separator unit including a second snap ring connected to said second shaft and received in said indented snap ring receiving chamber.