Patents by Inventor Naoaki Iwasaki

Naoaki Iwasaki 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: 9481217
    Abstract: In a computerized method for generating a finite element model of a pneumatic tire provided in the tread portion with a zero-degree band, a 2D tire model is firstly generated based on the finished tire shape in a tire vulcanization mold, where the 2D tire model includes a 2D model of a band ply. Secondary, a residual stress is computed and defined on each element of the band ply model. Then, a deformation calculation is made on the 2D tire model to obtain the deformed 2D tire model. Finally, a 3D tire model is generated by duplicating the 2D tire model around the tire rotational axis.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: November 1, 2016
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Naoaki Iwasaki
  • Publication number: 20130304428
    Abstract: A computerized method for generating a finite element model of a pneumatic tire provided in the tread portion with a zero-degree band is disclosed. Firstly, a tire model is generated based on the finished tire shape in a tire vulcanization mold, wherein the tire model includes a model of a band ply. Secondary, a residual stress is computed and defined on each element of the band ply model. Then, a deformation calculation is made on the tire model.
    Type: Application
    Filed: February 1, 2013
    Publication date: November 14, 2013
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventor: Naoaki IWASAKI
  • Patent number: 7149670
    Abstract: The present invention is a method for tire rolling simulation comprising the steps of: setting a tire model by modeling a tire with the use of elements capable of numerical analysis; setting a road surface model including a road-surface matter model formed by modeling road-surface matter forming a road surface with the use of elements that can be numerically analyzed and can cause a volume change due to compression which is substantially permanent; and performing a tire rolling simulation by making the tire model get in contact with the road-surface matter model, thereby providing the tire model with rotating conditions, and conducting deformation calculations of the tire model and the road-surface matter model at minute time increment intervals.
    Type: Grant
    Filed: September 18, 2002
    Date of Patent: December 12, 2006
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Naoaki Iwasaki, Masaki Shiraishi, Akio Miyori
  • Publication number: 20060231342
    Abstract: Enables the uniform, accurate application, onto microscale areas, of an in-solution oil repellent of low viscousness and in which the solvent is of extremely high volatility. A contacting piece that comes into contact with a target for application of the repellent is encased inside a sheath structure that, including the contacting piece, is lent rigidity. Therein, while the in-solution oil repellent is fed along the inside of the sheath structure, along the contacting piece itself, and onto the repellent-application target, it is coated on by the contacting piece tracing the surface of the application target. Giving at least the application start-point two coats, or a number of applications greater than that, yields a coating film of still higher uniformity.
    Type: Application
    Filed: April 18, 2006
    Publication date: October 19, 2006
    Applicant: NIDEC CORPORATION
    Inventors: Katsuhisa Shinohara, Naoaki Iwasaki, Toshiya Tsujita, Tomoki Ida
  • Publication number: 20040107081
    Abstract: A method of simulating a tire on snow comprises
    Type: Application
    Filed: July 9, 2003
    Publication date: June 3, 2004
    Inventors: Akio Miyori, Masaki Shiraishi, Naoaki Iwasaki
  • Patent number: 6725168
    Abstract: A simulating method for vehicle/tire performances which includes: a tire model preparing step (s1) of preparing a tire model of a tire including a ply made out of a finite number of elements; a vehicle body model preparing step (s2) of preparing a vehicle body model of a vehicle body including suspension members made out of a finite number of elements; a vehicle model preparing step (s3) of preparing a vehicle model by attaching the tire model to a suspension model of the suspension members in the vehicle body model; and a simulation step (s4, s5) of virtually running the vehicle model by giving a boundary condition, and estimating vehicle's traveling properties and/or a tire property.
    Type: Grant
    Filed: April 2, 2002
    Date of Patent: April 20, 2004
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Masaki Shiraishi, Naoaki Iwasaki
  • Patent number: 6691566
    Abstract: A method of making a finite element model of a pneumatic tire comprises: dividing a pneumatic tire into a plurality of modeling units each of which is to be modeled by one or more finite elements so that the modeling units include modeling units each of which is a layered complex of at least one cord layer and at least one rubber layer; and modeling each modeling unit which is a layered complex by a single shell element provided with a plurality of integral points corresponding to the cord and rubber layer.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: February 17, 2004
    Assignees: Sumitomo Rubber Industries, Ltd., The Japan Research Institute, Limited
    Inventors: Naoaki Iwasaki, Kimihiro Hayashi, Sturt Richard
  • Patent number: 6575214
    Abstract: A vehicle tire which has an aspect ratio of less than about 55% and comprises a tread portion having a profile whose radius of curvature decreases substantially continuously from the tire equator to each tread edges. The tread profile from the tire equator to each tread edge is substantially defined by a curve such as ellipse, cycloid, epicycloid, involute curves and the like, of which equation is differentiable in the range between the tire equator and each tread edge.
    Type: Grant
    Filed: May 10, 2000
    Date of Patent: June 10, 2003
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Naoaki Iwasaki, Chieko Aoki
  • Publication number: 20030055617
    Abstract: The present invention is a method for tire rolling simulation comprising the steps of: setting a tire model by modeling a tire with the use of elements capable of numerical analysis; setting a road surface model including a road-surface matter model formed by modeling road-surface matter forming a road surface with the use of elements that can be numerically analyzed and can cause a volume change due to compression which is substantially permanent; and performing a tire rolling simulation by making the tire model get in contact with the road-surface matter model, thereby providing the tire model with rotating conditions, and conducting deformation calculations of the tire model and the road-surface matter model at minute time increment intervals.
    Type: Application
    Filed: September 18, 2002
    Publication date: March 20, 2003
    Inventors: Naoaki Iwasaki, Masaki Shiraishi, Akio Miyori
  • Publication number: 20020134149
    Abstract: A simulating method for vehicle/tire performances which comprises: a tire model preparing step (s1) of preparing a tire model of a tire including a ply made out of a finite number of elements; a vehicle body model preparing step (s2) of preparing a vehicle body model of a vehicle body including suspension members made out of a finite number of elements; a vehicle model preparing step (s3) of preparing a vehicle model by attaching the tire model to a suspension model of the suspension members in the vehicle body model; and a simulation step (s4, s5) of virtually running the vehicle model by giving a boundary condition, and estimating vehicle's traveling properties and/or a tire property.
    Type: Application
    Filed: April 2, 2002
    Publication date: September 26, 2002
    Inventors: Masaki Shiraishi, Naoaki Iwasaki
  • Publication number: 20020050317
    Abstract: A method of making a finite element model of a pneumatic tire comprises: dividing a pneumatic tire into a plurality of modeling units each of which is to be modeled by one or more finite elements so that the modeling units include modeling units each of which is a layered complex of at least one cord layer and at least one rubber layer; and modeling each modeling unit which is a layered complex by a single shell element provided with a plurality of integral points corresponding to the cord and rubber layer.
    Type: Application
    Filed: September 6, 2001
    Publication date: May 2, 2002
    Inventors: Naoaki Iwasaki, Kimihiro Hayashi, Sturt Richard
  • Patent number: 6073668
    Abstract: A vehicle tire which has an aspect ratio of less than about 55% and comprises a tread portion having a profile whose radius of curvature decreases substantially continuously from the tire equator to each tread edges. The tread profile from the tire equator to each tread edge is substantially defined by a curve such as ellipse, cycloid, epicycloid, involute curves and the like, of which equation is differentiable in the range between the tire equator and each tread edge.
    Type: Grant
    Filed: April 13, 1998
    Date of Patent: June 13, 2000
    Assignee: Sumitomo Rubber Industries, Inc.
    Inventors: Naoaki Iwasaki, Chieko Aoki
  • Patent number: 5645657
    Abstract: A pneumatic tire has a tread part with two wide circumferential grooves having a width GW of not less than 35 mm and not more than the ground-contacting width TW of the tread with one circumferential groove extending on each side of the tire's equator so as to divide the tread part into a pair of shoulder parts and a central part. The central part has a surface utilizing successive convex curves of a pair of inner groove walls and a central ground-contacting surface. The central ground-contacting surface is substantially in contact with a virtual tread line between outer surfaces of the shoulder parts, and the surface of the central part is asymmetrical about the tire equatorial plane CL.
    Type: Grant
    Filed: April 11, 1995
    Date of Patent: July 8, 1997
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventor: Naoaki Iwasaki
  • Patent number: 5643373
    Abstract: A pneumatic tire having an improved tread profile capable of improving wet grip and running noise without sacrificing dry grip. The tread portion is provided with a pair of circumferential grooves to divide the tread portion into a central portion and a pair of shoulder portions. The contour of the central portion comprises a central face defined by a convex curve and a pair of side faces each defined by a concave curve. Each of the side faces extends axially outwardly and radially inwardly from each axial edges of the central face towards the bottom of the adjacent circumferential groove. The side faces intersects the central face to form an angle of less than 180 degrees. In a standard condition in which the tire is mounted on a standard rim, and inflated to 70% of the maximum air pressure, and loaded with 70% of the maximum load, the ground contacting width of the central portion is not greater than the axial width between the axial edges of the central face.
    Type: Grant
    Filed: December 29, 1994
    Date of Patent: July 1, 1997
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventor: Naoaki Iwasaki