Patents by Inventor Chang Wook HA

Chang Wook HA 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).

  • Load-sensitive automatic transmission system for agricultural electric vehicle
    Patent number: 8475334
    Abstract: A load-sensitive automatic transmission system for an agricultural electric vehicle is provided, which includes a drive motor for generating a rotational power using electric power of a battery; a transmission for changing a rotational speed of the drive motor in multiple stages and outputting the changed rotational speed; a forward/reverse differential gear for transmitting the power of the transmission to wheels; a control unit for detecting a running state of the vehicle and a load state of the drive motor and determining a speed change time; and an actuator for operating the transmission in response to a signal from the control unit. Accordingly, it is possible to selectively provide high speed and torque to meet the needs of different situation, beyond the limitations of the motor drive performance of a conventional electric vehicle.
    Type: Grant
    Filed: July 7, 2011
    Date of Patent: July 2, 2013
    Assignees: Daedong Industrial Co., Ltd., Hankuk Chain Industrial Co., Ltd
    Inventors: Chang Wook Ha, Byoung Soo Kwon, Sung Do Im
  • LOAD-SENSITIVE AUTOMATIC TRANSMISSION SYSTEM FOR AGRICULTURAL ELECTRIC VEHICLE
    Publication number: 20120010042
    Abstract: A load-sensitive automatic transmission system for an agricultural electric vehicle is provided, which includes a drive motor for generating a rotational power using electric power of a battery; a transmission for changing a rotational speed of the drive motor in multiple stages and outputting the changed rotational speed; a forward/reverse differential gear for transmitting the power of the transmission to wheels; a control unit for detecting a running state of the vehicle and a load state of the drive motor and determining a speed change time; and an actuator for operating the transmission in response to a signal from the control unit. Accordingly, it is possible to selectively provide high speed and torque to meet the needs of different situation, beyond the limitations of the motor drive performance of a conventional electric vehicle.
    Type: Application
    Filed: July 7, 2011
    Publication date: January 12, 2012
    Applicants: HANKUK CHAIN INDUSTRIAL CO., LTD., DAEDONG INDUSTRIAL CO., LTD.
    Inventors: Chang Wook HA, Byoung Soo KWON, Sung Do IM