Patents by Inventor Dai Niwata

Dai Niwata 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).

  • Patent number: 9816582
    Abstract: A balancer device includes a housing fixed to an internal combustion engine, a roller bearing disposed in the housing, a balancer shaft rotatably supported in the housing by the roller bearing, a balancer weight integrally mounted on the balancer shaft and rotatably accommodated in an weight accommodation room of the housing, an introduction part that introduces a lubricating oil from the outside to the inside of the weight accommodation room, and a discharge part that provides communication between the inside and the outside of the weight accommodation room and discharges the lubricating oil from the inside of the weight accommodation room, wherein herein the roller bearing is arranged to face the weight accommodation room.
    Type: Grant
    Filed: October 15, 2015
    Date of Patent: November 14, 2017
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Harunobu Okabe, Masatoshi Matsuo, Tamotsu Todo, Masaharu Saito, Dai Niwata, Hiroaki Kabasawa
  • Publication number: 20160131221
    Abstract: A balancer device includes a housing fixed to an internal combustion engine, a roller bearing disposed in the housing, a balancer shaft rotatably supported in the housing by the roller bearing, a balancer weight integrally mounted on the balancer shaft and rotatably accommodated in an weight accommodation room of the housing, an introduction part that introduces a lubricating oil from the outside to the inside of the weight accommodation room, and a discharge part that provides communication between the inside and the outside of the weight accommodation room and discharges the lubricating oil from the inside of the weight accommodation room, wherein herein the roller bearing is arranged to face the weight accommodation room.
    Type: Application
    Filed: October 15, 2015
    Publication date: May 12, 2016
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Harunobu OKABE, Masatoshi MATSUO, Tamotsu TODO, Masaharu SAITO, Dai NIWATA, Hiroaki KABASAWA
  • Patent number: 9206690
    Abstract: A variable displacement pump includes: side walls provided on both sides of the cam ring in an axial direction; and an introduction passage which is formed on one of the separation walls across which the hydraulic chambers pass when the hydraulic chambers are moved from the suction portion to the discharge portion, which is arranged to shut off a connection between one of the hydraulic chambers and the control hydraulic chamber by an axial end surface of the cam ring when the cam ring is in a maximum eccentric state, and which is arranged to connect the one of the hydraulic chambers and the control hydraulic chamber by a movement of the cam ring in the direction to decrease the eccentric amount of the cam ring, and thereby to introduce the discharge pressure within the control hydraulic chamber to the one of the hydraulic chambers.
    Type: Grant
    Filed: April 11, 2012
    Date of Patent: December 8, 2015
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Dai Niwata, Koji Saga
  • Publication number: 20130028770
    Abstract: A variable displacement pump includes: side walls provided on both sides of the cam ring in an axial direction; and an introduction passage which is formed on one of the separation walls across which the hydraulic chambers pass when the hydraulic chambers are moved from the suction portion to the discharge portion, which is arranged to shut off a connection between one of the hydraulic chambers and the control hydraulic chamber by an axial end surface of the cam ring when the cam ring is in a maximum eccentric state, and which is arranged to connect the one of the hydraulic chambers and the control hydraulic chamber by a movement of the cam ring in the direction to decrease the eccentric amount of the cam ring, and thereby to introduce the discharge pressure within the control hydraulic chamber to the one of the hydraulic chambers.
    Type: Application
    Filed: April 11, 2012
    Publication date: January 31, 2013
    Applicant: HITACHI Automotive Systems, Ltd.
    Inventors: Dai NIWATA, Koji Saga
  • Patent number: 7410346
    Abstract: An oil pump includes a partition for dividing an outlet port into a first passage section on the upstream side and a second passage section on the downstream side, wherein a discharge passage fluidly communicates with the first passage section, and a relief valve is disposed in the second passage section.
    Type: Grant
    Filed: October 28, 2004
    Date of Patent: August 12, 2008
    Assignee: Hitachi, Ltd.
    Inventor: Dai Niwata
  • Publication number: 20050095148
    Abstract: An oil pump includes a partition for dividing an outlet port into a first passage section on the upstream side and a second passage section on the downstream side, wherein a discharge passage fluidly communicates with the first passage section, and a relief valve is disposed in the second passage section.
    Type: Application
    Filed: October 28, 2004
    Publication date: May 5, 2005
    Inventor: Dai Niwata