Positive displacement fluid pump
AssigneeTI Group Automotive Systems, L.L.C.
InventorsWayne T. Lipinski, Joseph M. Ross
Life of this patent
Estimating the term…
Abstract
A fluid pump includes a motor, an inner gear rotor and an outer gear rotor. The inner gear rotor is driven for rotation about an axis by the motor and has a plurality of outwardly extending teeth. The outer gear rotor has a plurality of inwardly extending teeth that are engaged by the teeth of the inner gear rotor so that the outer gear rotor is driven for rotation about a second axis when the inner gear rotor rotates. At least one of the inner gear rotor and the outer gear rotor is formed from a plastic material.
Claims18
A fluid pump, comprising:
- a motor;
- a first pump body;
- a second pump body adjacent to the first pump body;
- an inner gear rotor received between the first pump body and second pump body, driven for rotation about an axis by the motor and having a plurality of outwardly extending teeth;
- an outer gear rotor received between the first pump body and second pump body, and having a plurality of inwardly extending teeth that are engaged by the teeth of the inner gear rotor so that the outer gear rotor is driven for rotation about a second axis when the inner gear rotor rotates;
- the inner gear rotor is formed from a plastic material and the outer gear rotor is formed from a sintered austenitic stainless steel having 0.03% to 0.1% carbon, a density of at least 6.8g/cc and a hardness greater than 60 on the Rockwell B scale;
- and
- a guide pin carried by at least one of the first pump body or the second pump body and defining an axis about which the inner gear rotor rotates, and the guide pin is formed of metal.
The fluid pump of claim I wherein a clearance between tips of the inner gear rotor teeth and the outer gear rotor teeth is between 10 and 30 microns.
A fluid pump, comprising:
- an electric motor;
- a first pump body;
- a second pump body adjacent to the first pump body;
- an inner gear rotor of a plastic material received between the first pump body and the second pump body, driven for rotation about an axis by the motor and having a plurality of outwardly extending teeth;
- an outer gear rotor received between the first pump body and the second pump body, having a plurality of inwardly extending teeth that are engaged by the teeth of the inner gear rotor so that the outer gear rotor is driven to rotate about a second axis when the inner gear rotor is rotated by the electric motor;
- and
- the outer gear rotor is made of a sintered austenitic stainless steel having 0.03% to 0.1% carbon, a density of at least 6.8g/cc and a hardness greater than 60 on the Rockwell B scale.
Dependencies are inferred from the claim text.