Toyo Tire Corporation

Hiroshi Nashio

Takeshi Miyamoto

A method is disclosed for analyzing the rolling of a rotating body that will make it possible to simultaneously achieve reduction in computational cost and attainment of adequate analytic precision. The method includes: a step (S, S) in which a structural model is acquired; a step (S) in, which a region Aron a rotating body T at which finely divided computational mesh cells are established is made to come in contact with the ground, and rolling analysis processing is performed in which rolling is made to occur in an amount that is an angle corresponding to N minimum units (where N is a natural number not less than 1); and a step (S) in which mapping processing is performed in which physical quantities at computational mesh cells as they exist following the rolling analysis processing are copied to corresponding computational mesh cells at a rolling start time.

Method and device for rotation analysis of rotating body

A method for analyzing fluid around a rotating body includes: a step (S) in which a spatial model having a rotating computational mesh cell group A and a stationary computational mesh cell group B is acquired; a step (S) in which a storage computational mesh cell group C is established; a step (S) in which arithmetic operations for fluid analysis are performed; a step (S) in which the physical quantity at the computational mesh cell making up the rotating computational mesh cell group A calculated as a result of arithmetic operations for fluid analysis is copied to a corresponding computational mesh cell at the storage computational mesh cell group C; and a step (S) in which averages over time are calculated for the physical quantities at the storage computational mesh cell group C and the stationary computational mesh cell group B.

Method and device for analyzing fluid around rotating body

A pneumatic tire includes a projection formed on a surface of a tire tread portion. A thickness of the projection, which is a distance from the surface of the tread portion to a top surface of the projection, is smaller than a width of the projection, which is a size of the top surface in a tire circumferential direction. The width of the projection is equal to or more than 10 mm.

Pneumatic tire

A pneumatic tire includes a projection formed on a surface of a tire side portion. The projection includes a top surface, and first and second side surfaces respectively forming a side surface in a tire circumferential direction. A first side edge portion, where the top and first side surfaces intersect, has an inclination to a tire radial direction viewed in a tire width direction. A second side edge portion, where the top and second side surfaces intersect, has an inclination to the tire radial direction as viewed in the tire width direction. A first tip end angle made by the top surface and the first side surface on the first side edge portion, and a second tip end angle made by the top surface and the second side surface on the second side edge portion are 100&#xb0; or less. The rotational direction of the pneumatic tire is not designated.

Durability of a pneumatic tire is enhanced by effectively promoting heat radiation by air cooling. A plural of projections are comprised on a surface of a tire side portion. The projection comprises a front side surface which is a side surface of a tire rotational direction side and an outer end surface which is a side surface of a tire outer radial direction side. The front edge portion intersects a straight line extending in a tire radial direction as viewed in a tire wide direction. A tip angle made by the top surface and the front side surface on the edge portion of the projection is equal to or less than 100&#xb0;. The outer end surface comprises a projection having an inclination side surface which is inclined in a tire rotating rivers direction toward a tire outer radial direction.

A pneumatic tire includes a plurality of projections formed on a surface of a tire side portion at an interval in a tire circumferential direction. A thickness of the projection is smaller than a width of a top surface of the projection in a tire circumferential direction. The thickness is a distance from the surface of the tire side portion to the top surface of the projection. The width of the projection is 10 mm or more. The interval of the projections is 3 times or more and 10 times or less as large as the thickness of the projection.

Growing community of inventors

Osaka, Japan

Hiroshi Nashio