Patents by Inventor Katsuo Obunai

Katsuo Obunai 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).

  • Method for tangential force variation and angular acceleration fluctuation prediction in tires
    Patent number: 7428467
    Abstract: It is possible to significantly reduce a prediction error of the high-speed RFV and the high-speed TFV in a tire having a large PRO growth amount at high speed. Three or more sample tires are extracted from each lot. The PRO and RFV are measured and the least-square method is used to predict (100) the upper and lower and front and back natural angle frequency, attenuation ratio, upper and lower spring constant, and rolling radius coefficient. By using the PRO measurement apparatus, the PRO during idling is measured. By using an AAV measurement apparatus, an actual measurement value AAVL of the angle acceleration fluctuation at a low speed is measured (102). The PRO and AAV at a high speed are predicted (104) and the actual measurement value and prediction value are used to predict the high-speed RFV and TFV.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: September 23, 2008
    Assignee: Bridgestone Corporation
    Inventor: Katsuo Obunai
  • Radial force variation prediction method, tangential force variation prediction method, radial run out prediction method, tire angle acceleration fluctuation prediction method, radial run out measurement apparatus, radial run out estimation method, information acquisition method, and tire peripheral surface condition calculation apparatus
    Publication number: 20070100576
    Abstract: It is possible to significantly reduce a prediction error of the high-speed RFV and the high-speed TFV in a tire having a large PRO growth amount at high speed. Three or more sample tires are extracted from each lot. The PRO and RFV are measured and the least-square method is used to predict (100) the upper and lower and front and back natural angle frequency, attenuation ratio, upper and lower spring constant, and rolling radius coefficient. By using the PRO measurement apparatus, the PRO during idling is measured. By using an AAV measurement apparatus, an actual measurement value AAVL of the angle acceleration fluctuation at a low speed is measured (102). The PRO and AAV at a high speed are predicted (104) and the actual measurement value and prediction value are used to predict the high-speed RFV and TFV.
    Type: Application
    Filed: December 19, 2006
    Publication date: May 3, 2007
    Inventor: Katsuo Obunai
  • Tire radial force variation prediction method
    Patent number: 7174271
    Abstract: It is possible to significantly reduce a prediction error of the high-speed RFV and the high-speed TFV in a tire having a large PRO growth amount at high speed. Three or more sample tires are extracted from each lot. The PRO and RFV are measured and the least-square method is used to predict (100) the upper and lower and front and back natural angle frequency, attenuation ratio, upper and lower spring constant, and rolling radius coefficient. By using the PRO measurement apparatus, the PRO during idling is measured. By using an AAV measurement apparatus, an actual measurement value AAVL of the angle acceleration fluctuation at a low speed is measured (102). The PRO and AAV at a high speed are predicted (104) and the actual measurement value and prediction value are used to predict the high-speed RFV and TFV.
    Type: Grant
    Filed: October 11, 2002
    Date of Patent: February 6, 2007
    Assignee: Bridgestone Corporation
    Inventor: Katsuo Obunai
  • Radial force variation prediction method, tangential force variation prediction method, radial run out prediction method, tire angle acceleration fluctuation prediction method, radial run out measurement apparatus, radial run out estimation method, information acquisition method, an
    Publication number: 20050216224
    Abstract: It is possible to significantly reduce a prediction error of the high-speed RFV and the high-speed TFV in a tire having a large PRO growth amount at high speed. Three or more sample tires are extracted from each lot. The PRO and RFV are measured and the least-square method is used to predict (100) the upper and lower and front and back natural angle frequency, attenuation ratio, upper and lower spring constant, and rolling radius coefficient. By using the PRO measurement apparatus, the PRO during idling is measured. By using an AAV measurement apparatus, an actual measurement value AAVL of the angle acceleration fluctuation at a low speed is measured (102). The PRO and AAV at a high speed are predicted (104) and the actual measurement value and prediction value are used to predict the high-speed RFV and TFV.
    Type: Application
    Filed: October 11, 2002
    Publication date: September 29, 2005
    Inventor: Katsuo Obunai