Sumitomo Rubber Industries Limited

Sri Sports Limited

Other

Masaya Tsunoda

Arjun Yadav

Masahide Onuki

Keiji Moriyama

Kiyoto Maruoka

Ryosuke Tanimoto

Kazuo Hochi

Akihiro Nakahara

Jun Ochi

Kouhei Takemura

Masahiko Ueda

Kazuhisa Fushihara

Tetsuo Yamaguchi

Kazuo Asano

Masaki Shiraishi

Seigou Sakagami

Takashi Tanaka

Kei Kohara

Masayoshi Nishio

Kazuhiro Fujisawa

Mitsunori Miki

Hisashi Kakiuchi

Ao Imamura

Norio Sumitomo

Ryota Tamada

Masahide Ohnuki

Shinji Kuchiki

Hiroto Setokawa

Hiroyuki Tsujinaka

Kinuko Tsujinaka, Legal Representative

Minoru Tsujinaka, Legal Representative

Hiroyuki Tsujinaka, Deceased

The present invention increases tire formation precision and is a tire manufacturing method, which comprises a step Sfor forming a green tire on the outer surface of a rigid inner mold and a vulcanization step Sfor vulcanizing the green tire. The rigid inner mold comprises: an inner mold body, which is obtained from multiple segments; a core, which substantially binds the various segments; and an outer diameter adjusting means for changing the outer diameter of the core by changing the temperature of the core. Moreover. the rigid inner mold performs changes such that by expansion of the outer diameter of the core, the various segments move outward in the radial direction of the tire and gaps between the segments are enlarged, while by reducing the outer diameter of the core, the various segments move inward in the radial direction of the tire and the level differences R on the outer surface between adjacent segments increase. The vulcanization step Scomprises an adjustment steps Sfor adjusting the outer diameter of the core using the outer diameter adjustment means so that the gaps G and the level differences R are within a previously established range.

Tire manufacturing method

An apparatus for vulcanizing a tire comprises: a side mold segment provided with a face for shaping the outer surface of a tire sidewall portion, and an opposite face not serving for shaping; and a heater part for vulcanizing the raw tire. The heater part is disposed adjacently to the side mold segment to heat the raw tire abutting on the side-shaping-face from the side of the face not serving for shaping. The side mold segment is provided with a flow path through which a first fluid whose temperature is lower than the vulcanization temperature of the raw tire can flow to prevent over-vulcanization of the sidewall portion.

Tire vulcanizing apparatus

A computer-implemented method for simulating a flow of fluid around a solid object comprises: defining straight lines between gravity points of elements in a solid object region and gravity points of elements in a fluid region; defining intersecting points of the straight lines with a boundary surface between the two regions; calculating distances between the intersecting points and the gravity points in the fluid region; and obtaining the shearing stress at the boundary surface.

Computer-implemented method for simulating flow of fluid around solid object

A computerized method for simulating a plastic material flowing through an extruding channel comprises a step of making a flow calculation. The flow calculation includes: a primary calculation based on the plastic material model provided with a viscosity which is constant; a secondary calculation based on the plastic material model which is provided with a viscosity having a shear-velocity dependency or alternatively a temperature dependency, and whose initial values are set to those of the material model calculated in the primary calculation step; and a third calculation based on the material model which is provided with a viscosity having both of the shear-velocity dependency and the temperature dependency, and whose initial values are set to those of the material model calculated in the secondary calculation step.

Method and apparatus for simulating plastic material flowing through extruding channel

A computerized method for simulating a fluidized state of a plastic material in a chamber, comprises steps of: generating a chamber model which is a finite volume model of the chamber; defining a material model of the plastic material; defining a gas-phase model of gas; and making a flow calculation of the material model and the gas-phase model which are in the chamber model, wherein the material model is provided with viscosity of the plastic material, and the gas-phase model is provided with viscosity which is more than the actual viscosity of the gas.

Method for simulating multiphase flow of plastic material and gas

Computerized analysis method for estimating a kneaded state of a fluid, comprises: a step of generating a finite element model of a kneading space within which the fluid is kneaded; a step of defining a model of the fluid; a step of defining the fluid model in the kneading space model at a filling rate of less than 100% and defining necessary kneading conditions; a particle tracking step in which, a flow calculation of the fluid model is made, and virtual particles disposed in the fluid model are tracked; an estimating step in which the positional data of the virtual particles are compared with those in an ideal kneaded state of the fluid model, and the degree of kneading of the fluid model is calculated. The ideal kneaded state is calculated in the estimating step, based on existence positions of the fluid model calculated in the particle tracking step.

Simulating method for kneaded state of fluid

A computerized method for simulating a high-viscosity fluid in a chamber is disclosed, wherein a model of the fluid is set in a model of the chamber and a flow calculation is performed. In the flow calculation, with respect to a contact surface of a wall of the chamber model with which the fluid model contacts, a slip velocity of the fluid model is defined by specific equations.

Method for simulating high-viscosity fluid

A three-dimensional fluid simulation method is disclosed wherein: a first mesh of a flow domain non-uniformly split with respect to each of three degrees of freedom is defined; a second mesh uniformly sprit with respect to only one of the three degrees of freedom but non-uniformly with respect to other two degrees is defined; an object model is set in the first mesh and a motion equation is formed and calculated to obtain fluid velocity; based on the fluid velocity, flow imbalance is computed for each cell; based on the flow imbalance, fluid pressure correction equation is formed; the flow imbalance is mapped onto the second mesh and the fluid pressure correction is computed; the fluid pressure correction is mapped onto the first mesh; and until the flow imbalance and motion equations are converged the computation is repeated.

Three-dimensional fluid simulation method

A method for defining a fluid/solid boundary for computational fluid dynamics simulations making use of a coordinate system mesh and a solid object model, which includes the steps of defining straight lines on which all of the grid points of the coordinate system mesh are positioned; obtaining intersecting points of the straight lines with the surface of the solid object model; and a step in which, for each of the straight lines having the intersecting points, the grid points on the straight line are searched for the nearest point to each of the intersecting points, and based on the searched-out nearest points, the positioned grid points are determined as to whether the grid point is positioned inside the solid object model or in the fluid region.

Method for defining fluid/solid boundary for computational fluid dynamics simulations

A simulation method utilizing a Cartesian grid comprises: a process in which a model of a two or three-dimensional space is defined as a Cartesian grid composed of cells; a process in which, based on a physical value and condition associated with the Cartesian grid, a Poisson equation is defined; and a process in which, the physical value is calculated by approximately solving the Poisson equation. The calculating process comprises: a step of calculating an error by using a Block-Cyclic Reduction Algorithm; a step of testing whether the calculated error is within a predetermined acceptable range or not; and a step of correcting a variable &#x3c6; by the use of a correction parameter if the calculated error is outside the predetermined acceptable range. The calculating process repeats the error calculating step, testing step and error correcting step until the error becomes within the predetermined acceptable range.

Simulation method utilizing cartesian grid

A method of searching real numbers for a nearest neighbor to a query point includes a construction phase in which a database of the real numbers is prepared; and a search phase in which the nearest neighbor is searched by the use of the database. The database includes a series of buckets that respectively correspond to small one-dimensional spaces defined by dividing a one-dimensional space between a minimum real number and a maximum real number at regular intervals. The buckets include data about real number(s) falling in one of the small one-dimensional spaces corresponding to the bucket concerned, and the number of the real number(s). The search phase includes locating one of the buckets in which the query point falls; checking the bucket size of the located bucket whether the bucket size thereof is zero; and searching the nearest neighbor by the use of the data in the bucket.

Nearest neighbor search method

A face backside of a golf club head is provided with six or more ribs extended from a face center toward face circumferences. Anglestobetween respective pairs of adjoining ones of the ribs are less than 90&#xb0;. One of the ribs that form the smallest angle between its extension direction and a head vertical direction dand that extends from the face center toward a crown-side face circumference constitutes an upward rib, which has a smaller cross-sectional area than any of those of the other ribs.

Golf club head

By bringing a golf ball into collision with a collisional plate and measuring a coefficient of dynamic friction at this collision, contact force at the time of collision between an actual golf club and the golf ball is analyzed and spin rate of the golf ball is estimated. This invention provides a method for measuring a coefficient of dynamic friction between a golf ball and a collisional plate when the golf ball collides with the collisional plate disposed aslant at a predetermined angle with respect to a flying direction of the golf ball. The method includes concurrently obtaining a time function Fn(t) of contact force in the direction perpendicular to the collisional plate, and a time function Ft(t) of contact force in the direction parallel with the collisional plate; and determining as a coefficient of dynamic friction, a maximum value of a time function M(t) of ratio between Fn(t) and Ft(t) represented by M(t)=Ft(t)/Fn(t).

Method of measuring coefficient of dynamic friction between golf ball and collisional plate

A golf club head containing a face portion having a front face defining a club face for hitting a ball and a hollow portion provided behind the face portion, wherein the frequency F(fix) of a local minimum value of the first-order vibration mode in a frequency response function of the club head obtained by vibrating an input point on the club face and measuring the response at an output point on the club face is in a range of from 200 to 1400 Hz; and the frequency F(free) of the smallest local minimum value of a frequency response function of the club head obtained by hitting the input point and measuring the response at the output point is in a range of from 5000 to 9000 Hz.

Golf club head and method of making the same

A method of designing a golf club head, including the steps of using a golf club head model and a golf ball model both of which are composed of a plurality of finite elements; impacting the head model against the ball model; and measuring a time period Tin which the face of the head model is in contact with the ball model and a time period Tfrom the time of contact between the head model and the ball model until the time when a vertical force acting on the face of the golf club head model takes a peak value; setting the ratio of the time period Tto the time period Thigh and increase a frictional force acting in a direction in which the backspin of a golf ball decreases and a period of time in which the frictional force acts.

Growing community of inventors

Kobe, Japan

Masaya Tsunoda