No.1018E 2022Special Edition on Industry Related Technologies Development of a Low-Torque Electric Oil Pump for Cooling of BEV Motors |
| Category | TECHNICAL REPORT |
|---|---|
| Author | N. YOSHIDA H. KAGAWA Hydraulic System Engineering Dept., Automotive Business Unit |
| Abstract | For the purpose of reducing the torque of electric oil pumps (EOP), we invented an internal gear pump with a new structure featuring additional grooves on the inner surface of its housing. Through performing tests, we confi rmed this internal gear pump demonstrated notably lower torque than conventional pumps. This is especially suitable for high-flow-rate EOP such as those used in cooling systems for BEV (: Battery Electric Vehicle) motors. This report discusses mechanism analysis, approximate mathematical expression, as well as the method and results of contribution by factor in relation to the pump’s torque loss. Furthermore, this report details the structure of the developed product conceived based on the aforementioned analysis, etc., as well as test results. |
| Keyword | internal gear pump, torque, mechanism analysis, contribution by factor, electric pump |
| Reference | 3) Y. INAGUMA: Calculation of Theoretical Torque and Displacement in an Internal Gear Pump, JTEKT ENGINEERING JOURNAL No. 1001E (2006) 70. |
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