ALEXANDRIA, Va., June 9 -- United States Patent no. 12,289,029, issued on April 29, was assigned to Nissan Motor Co. Ltd. (Yokohama, Japan) and Renault S.A.S. (Boulogne-Billancourt, France).
"Drive unit for series hybrid vehicle" was invented by Yuki Tsukagoshi (Kanagawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A drive unit includes an electric drive motor for driving and an electric generator motor in a series hybrid vehicle. Each of the motors includes a helical cooling passage helically surrounding an outer periphery of its stator. The first and second electric motors are housed in an outer housing such that the rotor axes are parallel. The helical cooling passages of the motors are connected...