US 11,840,992 B2
EGR pump system with overhung rotors
Brandon Dennis Biller, Hazel Park, MI (US); Jim Kevin Spring, Brighton, MI (US); Douglas Anthony Hughes, Novi, MI (US); Joshua Kreucher, Washington Township, MI (US); and Kevin Snyder, Marshall, MI (US)
Assigned to EATON INTELLIGENT POWER LIMITED, Dublin (IE)
Appl. No. 17/607,671
Filed by Eaton Intelligent Power Limited, Dublin (IE)
PCT Filed Apr. 30, 2020, PCT No. PCT/EP2020/025201
§ 371(c)(1), (2) Date Oct. 29, 2021,
PCT Pub. No. WO2020/221478, PCT Pub. Date Nov. 5, 2020.
Claims priority of provisional application 62/841,489, filed on May 1, 2019.
Prior Publication US 2022/0213852 A1, Jul. 7, 2022
Int. Cl. F02M 26/34 (2016.01); F01M 9/10 (2006.01); F01M 11/02 (2006.01); F04C 18/12 (2006.01)
CPC F02M 26/34 (2016.02) [F01M 9/10 (2013.01); F01M 11/02 (2013.01); F04C 18/126 (2013.01); F04C 2240/30 (2013.01); F04C 2240/40 (2013.01)] 29 Claims
OG exemplary drawing
 
1. An exhaust gas recirculation EGR pump system for an internal combustion engine comprising:
an EGR gas source;
an electric motor assembly;
a roots device coupled to the electric motor assembly, the roots device including a housing defining an internal volume, wherein the housing includes a radial inlet port receiving the EGR gas source and an outlet port expelling the EGR gas source from the housing;
rotors disposed in the internal volume and connected to the electric motor assembly; and
a transmission housing attached to the housing, the transmission housing including journals formed therein receiving bearings that support the rotors on only a single end of the rotors such that the rotors are overhung without bearing support at an opposite end of the rotors, at least when the rotors are in an undeflected condition.