Patents by Inventor Chikara Ueno

Chikara Ueno 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).

  • Hydraulic apparatus for adjusting the timing of opening and closing of an engine valve
    Patent number: 6173687
    Abstract: A hydraulic apparatus for adjusting the timing of opening and closing of an engine valve includes a cam shaft driven to rotate in synchronization with the engine rotation. An actuator is installed on the cam shaft for changing the timing of opening and closing of an intake valve and/or exhaust valve using a control of a working oil supply. A slidable plunger is disposed in the actuator, and a rotor is disposed in the actuator to engage with the plunger by an engaging hole. A spring urges the plunger to move into the engaging hole to make an engagement therebetween when the engine is stopped, and when the engine begins to run, the working oil is supplied into the engaging hole to push out the plunger from the engaging hole to release the engagement between a housing of the actuator and the rotor. The engaging hole and the plunger have a surface parallel with a slide direction of the plunger, and a clearance therebetween is smaller than 0.17 mm when the engaging hole and plunger engage each other.
    Type: Grant
    Filed: November 12, 1998
    Date of Patent: January 16, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Katsuyuki Fukuhara, Masafumi Sugawara, Makoto Yamauchi, Chikara Ueno
  • Hydraulic valve timing adjusting apparatus
    Patent number: 5957098
    Abstract: A hydraulic valve timing adjusting apparatus to be provided in a driving force transmission system for transmitting driving force to a camshaft with a cam for opening and closing an intake valve or an exhaust valve, comprising a housing assembly; a rotor provided so as to be relatively rotatable with respect to the housing assembly; hydraulic chambers formed between the rotor and the housing assembly; a convex member provided in one of the housing assembly and the rotor so as to be slidable therein; a recessed portion provided in the other one of the housing assembly and the rotor so as to be engageable with the convex member; an urging member for urging the convex member toward the recessed portion; and an oil passage which is able to supply oil pressure to the recessed portion; wherein when the oil pressure is supplied to one of the hydraulic chambers, the rotor is relatively rotated with respect to the housing assembly, and when the oil pressure is supplied to the recessed portion, the convex member is sli
    Type: Grant
    Filed: June 9, 1998
    Date of Patent: September 28, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Katsuyuki Fukuhara, Masafumi Sugawara, Makoto Yamauchi, Chikara Ueno