Patents by Inventor Yoshiaki Harakawa

Yoshiaki Harakawa 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: 6461120
    Abstract: A refrigerant passage within a main shaft includes an axial refrigerant passage extending in parallel with the main shaft from the end surface thereof, and a radial refrigerant passage communicating with the axial refrigerant passage and extending radially outwardly. The radial refrigerant passage is located between the end surface of the main shaft and a motor rotor. Thus, when the main shaft rotates, suctioned refrigerant is uniformly sprayed toward an entire coil. Further, the refrigerant flows toward a compression mechanism through the electric motor, thereby cooling the electric motor effectively.
    Type: Grant
    Filed: December 21, 2000
    Date of Patent: October 8, 2002
    Assignee: Denso Corporation
    Inventors: Yoshiaki Harakawa, Yoshitaka Akiyama, Masami Sanuki
  • Publication number: 20010012489
    Abstract: A refrigerant passage within a main shaft includes an axial refrigerant passage extending in parallel with the main shaft from the end surface thereof, and a radial refrigerant passage communicating with the axial refrigerant passage and extending radially outwardly. The radial refrigerant passage is located between the end surface of the main shaft and a motor rotor. Thus, when the main shaft rotates, suctioned refrigerant is uniformly sprayed toward an entire coil. Further, the refrigerant flows toward a compression mechanism through the electric motor, thereby cooling the electric motor effectively.
    Type: Application
    Filed: December 21, 2000
    Publication date: August 9, 2001
    Inventors: Yoshiaki Harakawa, Yoshitaka Akiyama, Masami Sanuki
  • Patent number: 6234768
    Abstract: Refrigerant passages in a compressor include an upper refrigerant passage and a lower refrigerant passage. The upper refrigerant passage is positioned above a datum line extending through a center of a rotor shaft of a compressor motor and perpendicularly to the rotor shaft, and the lower refrigerant passage is positioned below the datum line. A cross-sectional area of the upper refrigerant passage is larger than that of the lower refrigerant passage. Thus, even when lubricating-oil blocks the lower refrigerant passage, the refrigerant flows through the upper refrigerant passage, thereby reducing the pressure loss of the refrigerant, and preventing the lubricating oil from being caught in the refrigerant and discharged with the refrigerant from the compressor.
    Type: Grant
    Filed: November 26, 1999
    Date of Patent: May 22, 2001
    Assignee: Denso Corporation
    Inventors: Yoshiaki Harakawa, Masami Sanuki, Yuichi Tsumagari, Kenji Iriyama
  • Patent number: 4864322
    Abstract: An antenna rod, which is extendible and retractable, is moved up and down by a cable with a rack, and the cable is moved with rotation of a pinion gear. The rotational force of a DC motor is transferred to the pinion gear by a route of a worm, a worm wheel, gears, a damper gear, and a damper. The damper is a coil of resilient metal wire, and both ends of the coiled wire, respectively, engage stopping members, which are provided at the center portions of the damper gear and the pinion gear. When the pinion gear is at a standstill, the rotational energy of the damper gear is accumulated in the damper. The motor is rotated under control of a control circuit in response to the operation of a switch. The drive current for the motor is shut off by a detecting signal from a lock detector during the course of accumulating the rotational energy by the damper. The lead angle of the teeth of the worm is large so that the rotational energy stored in the damper is transferred to the motor.
    Type: Grant
    Filed: March 5, 1987
    Date of Patent: September 5, 1989
    Assignees: Asmo Co., Ltd., Nippondenso Co., Ltd.
    Inventors: Akinori Yamamoto, Kiyomitsu Oshikawa, Isaku Kawashima, Kazunori Nakayama, Yoshiaki Harakawa, Takenori Kuno, Makoto Watanabe