ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,560,168, issued on Feb. 24, was assigned to HITACHI ASTEMO LTD. (Hitachinaka, Japan).
"Variable displacement pump" was invented by Atsushi Naganuma (Hitachinaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "Discharge port (26) as arc-recessed discharge portion is formed by cutting on bottom surface (13a) of pump accommodating portion (13) of variable displacement pump. On mounting surface (1b) of housing body (1), first low pressure chamber (281) is formed at position overlapping with discharge port (26) in radial direction of pump structure (14) formed by driving shaft (3), rotor (4) and vanes (5) Drain hole (28b) communicating with low pressur...