Patents by Inventor Masakazu Hombo

Masakazu Hombo 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).

  • Control system for automatic transmission
    Patent number: 5810694
    Abstract: A control system for an automatic transmission having at least a friction coupling element which is coupled with a hydraulic pressure increasing by way of a leveled transitional pressure has an accumulator which discharge a high level of pressure accumulated therein into the friction coupling element during a gear shift under the condition where the line pressure is low.
    Type: Grant
    Filed: January 30, 1996
    Date of Patent: September 22, 1998
    Assignee: Mazda Motor Corporation
    Inventors: Shinya Kamada, Koichi Yamamoto, Tomoo Sawazaki, Hiroshi Shinozuka, Kazushi Kurokawa, Takamichi Teraoka, Masakazu Hombo, Naotaka Hirami, Yasunori Kanda, Akinobu Aoki, Tatsuhiko Iwasaki, Takeyoshi Kawa, Kenji Sawa
  • Automatic transmission control system
    Patent number: 5785628
    Abstract: A control system for an automatic transmission having friction coupling elements, at least one of which is locked in 3rd and 4th gears and unlocked in 1st and 2nd gears, includes a first shift valve shiftable between 3rd and 4th gears, and second shift valve shiftable between in 2nd gear and 1st gear in which engine brake available, and a solenoid valve providing control pressure which is selectively directed to these shift valves and cause them to shift so as to lock or unlock the friction coupling elements.
    Type: Grant
    Filed: January 30, 1996
    Date of Patent: July 28, 1998
    Assignee: Mazda Motor Corporation
    Inventors: Shinya Kamada, Kenji Sawa, Hiroshi Shinozuka, Tomoo Sawazaki, Koichi Yamamoto, Kazushi Kurokawa, Takamichi Teraoka, Masakazu Hombo, Naotaka Hirami, Yasunori Kanda, Akinobu Aoki, Tatsuhiko Iwasaki, Takeyoshi Kawa
  • Automatic transmission control system
    Patent number: 5772550
    Abstract: A control system for an automatic transmission having a transmission gear mechanism and a plurality of friction coupling elements which are selectively locked and unlocked with hydraulic oil to change power transmission paths to place the automatic transmission into desired available gears, a first one of the friction coupling elements having a locking pressure chamber and an unlocking pressure chamber and being locked when operating oil is supplied into only the locking pressure chamber and unlocking when operating oil is coincidentally supplied into the locking pressure chamber and the unlocking pressure chamber, and a second one of the friction coupling elements having a locking/unlocking pressure chamber in communication, with the unlocking pressure chamber of the first friction coupling element and being locked only when operation oil is supplied into the locking/unlocking pressure chamber.
    Type: Grant
    Filed: April 1, 1996
    Date of Patent: June 30, 1998
    Assignee: Mazda Motor Corporation
    Inventors: Shinya Kamada, Koichi Yamamoto, Tomoo Sawazaki, Hiroshi Shinozuka, Kazushi Kurokawa, Takamichi Teraoka, Masakazu Hombo, Naotaka Hirami, Yasunori Kanda, Akinobu Aoki, Tatsuhiko Iwasaki, Takeyoshi Kawa
  • Forward clutch and lockup clutch control in an automatic transmission control system
    Patent number: 5725455
    Abstract: A hydraulic control system for an automatic transmission having at least a forward clutch which is unlocked in a fourth gear and locked in other forward gears and a lock-up clutch for coupling input and output elements of a torque converter together is equipped with a pressure control valve for controlling operating pressure for the forward clutch, a lock-up control valve for connecting and disconnecting the first valve from the lock-up clutch, a pressure line through which control source pressure is introduced into the forward clutch while the first valve is in communication with the lock-up clutch, and a shift valve for discharging the control source pressure from the pressure line.
    Type: Grant
    Filed: January 30, 1996
    Date of Patent: March 10, 1998
    Assignee: Mazda Motor Corporation
    Inventors: Shinya Kamada, Kenji Sawa, Hiroshi Shinozuka, Tomoo Sawazaki, Koichi Yamamoto, Kazushi Kurokawa, Takamichi Teraoka, Masakazu Hombo, Naotaka Hirami, Yasunori Kanda, Akinobu Aoki, Tatsuhiko Iwasaki, Takeyoshi Kawa
  • Automatic transmission control system
    Patent number: 5665020
    Abstract: A control system for an automatic transmission having at least a friction coupling element which is coupled with a hydraulic pressure increasing by way of a leveled transitional pressure has an accumulator which discharge a high level of pressure accumulated therein into the fiction coupling element during a gear shift under the condition where the line pressure is low.
    Type: Grant
    Filed: January 30, 1996
    Date of Patent: September 9, 1997
    Assignee: Mazda Motor Corporation
    Inventors: Shinya Kamada, Koichi Yamamoto, Tomoo Sawazaki, Hiroshi Shinozuka, Kazushi Kurokawa, Takamichi Teraoka, Masakazu Hombo, Naotaka Hirami, Yasunori Kanda, Akinobu Aoki, Tatsuhiko Iwasaki, Takeyoshi Kawa, Kenji Sawa