Patents by Inventor Eiichiro Niizuma

Eiichiro Niizuma has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Oil pump rotor
    Patent number: 9574559
    Abstract: Provided is an oil pump rotor capable of improving a volume efficiency and a quietness. When a diameter of a base circle bi of an inner rotor is ? bi; a diameter of a first outer rolling circle Di is ? Di; a diameter of a first inner rolling circle di is ? di; a diameter of a base circle bo of an outer rotor is ? bo; a diameter of a second outer rolling circle Do is ? Do; a diameter of a second inner rolling circle do is ? do; and an eccentricity amount between the inner rotor and the outer rotor is e, ? bi=n·(? Di+? di) and ? bo=(n+1)·(? Do+? do) hold; either ? Di+? di=2e or ? Do+? do=2e holds; and ? Do>? Di and ? di>? do hold. When a clearance between the inner rotor and the outer rotor is t, 0.3?((? Do+? do)?(? Di+? di))·(n+1)/t?0.6 holds, provided that ? Di+? di=2e; or 0.3?((? Do+? do)?(? Di+? di))·n/t?0.6 holds, provided that ? Do+? do=2e.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: February 21, 2017
    Assignee: DIAMET CORPORATION
    Inventors: Atsushi Shiotani, Eiichiro Niizuma
  • OIL PUMP ROTOR
    Publication number: 20140178233
    Abstract: Provided is an oil pump rotor capable of improving a volume efficiency and a quietness. When a diameter of a base circle bi of an inner rotor is ? bi; a diameter of a first outer rolling circle Di is ? Di; a diameter of a first inner rolling circle di is ? di; a diameter of a base circle bo of an outer rotor is ? bo; a diameter of a second outer rolling circle Do is ? Do; a diameter of a second inner rolling circle do is ? do; and an eccentricity amount between the inner rotor and the outer rotor is e, ? bi=n·(? Di+? di) and ? bo=(n+1)·(? Do+? do) hold; either ? Di+? di=2e or ? Do+? do=2e holds; and ? Do>? Di and ? di>? do hold. When a clearance between the inner rotor and the outer rotor is t, 0.3?((? Do+? do)?(? Di+? di))·(n+1)/t?0.6 holds, provided that ? Di+? di=2e; or 0.3?((? Do+? do)?(? Di+? di))·n/t?0.6 holds, provided that ? Do+? do=2e.
    Type: Application
    Filed: December 13, 2012
    Publication date: June 26, 2014
    Inventors: Atsushi Shiotani, Eiichiro Niizuma