ALEXANDRIA, Va., May 19 -- United States Patent no. 12,631,251, issued on May 19, was assigned to AISIN Corp. (Kariya, Japan).
"Differential device and drive transmission device" was invented by Kohei Ito (Kariya, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A differential device includes a differential gear mechanism including a target shaft hole through which a target shaft penetrates. An oil reception groove is formed at a position that is on an inner circumferential surface of the target shaft hole and that communicates with a target opening of an end portion on an axial outer side in the target shaft hole. The oil reception groove extends in the circumferential direction. A connection groove ext...