Yokohama Rubber Patente

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There is provided a tire production method and system that reduce time loss due to material replenishment to improve work efficiency in a tire forming step, while downsizing the forming device. Materials in a wound state are stocked in a plurality of supply units arranged side by side for each material. A pair of bead members (MC) are stocked in a plurality of bead supply units (11). Each material cut into a predetermined length is supplied to a band drum (3) and a belt drum (4) by a supply conveyor via a slide conveyor to form an inner circumferential member (MA) and an outer circumferential member (MB). A green tire (G) is formed by the inner circumferential member (MA), the outer circumferential member (MB), and the pair of bead members (MC) by using the two shaping drums (2). Axial centers (C1) of the drums (2) and (3) and the drum axial centers (C2) of the drums (3) and (4) are coaxially aligned in transferring each material. While each material is being supplied from the other of the supply units, one of the supply units that is empty is replaced with a new supply unit with the material stocked.

Provided is a manufacturing device and method for a cylindrical tire member that has a simple configuration, can move a forming drum body in a drum width direction, position a supplied band-like tire material at a reference position of the forming drum body, wind the band-like tire material around the forming drum body, and accurately grasp a positioning degree thereof. A forming drum body (6) and sensors (10a, 10b) are moved in the drum width direction by a drum movement mechanism (7), widthwise position data of a tire material (M1) supplied in a flat state by a conveyor (16a) on the forming drum body (6) is successively detected by the sensors (10a, 10b), and based on data on a widthwise installation position of the sensors (10a, 10b) with respect to the forming drum body (6) and the widthwise position data of the tire material (M1) successively input to a control unit (17), a widthwise position of the tire material (M1) over its entire length with respect to a reference position in a width direction of the forming drum body (6).

Provided is a manufacturing device and method capable of manufacturing a high-quality cylindrical tire member with high productivity by smoothly and quickly supplying a forming drum body with a band-like tire material supplied in a flat state by a plurality of conveyors arranged side by side and accurately positioning the band-like tire material in a drum width direction. An upper structure portion (4) including a forming drum body (6) is disposed on a base portion (3). The base portion (3) and the upper structure portion (4) are connected by a vertical movement mechanism (9). A slide movement mechanism (8) integrally moves a drum unit (2) including the base portion (3), the upper structure portion (4), and the vertical movement mechanism (9) in the drum width direction. The vertical movement mechanism (9) vertically moves the upper structure portion (4) and moves the forming drum body (6) to a winding position. At the winding position, a drum movement mechanism (7) different from the slide movement mechanism (8) moves the forming drum body (6) in the drum width direction and winds tire materials (M1, M2) around the forming drum body (6) while correcting a variation in drum-widthwise positions of the tire materials (M1, M2).

Provided are a supply system for rapidly switching between different types of tire material and supplying one type of tire material to a forming drum body without complicated operation and for supplying a desired type of tire material within a desired range of the forming drum body in a width direction and a method of manufacturing a cylindrical tire member. In independent supply paths from supply units (1A and 1B) to heads (3A and 3B) corresponding to respective types of tire materials (M1 and M2) having a strip shape, predetermined amounts of tire materials (M1 and M2) are respectively stored in festoon portions (2a and 2b) between the supply units (1A and 1B) and the heads (3A and 3B), the heads (3A and 3B) are arranged displaced in a drum front-rear direction with respect to a forming drum body (7), the heads (3A and 3B) are integrally slid in a width direction of the forming drum body (7), the tire materials (M1 and M2) are helically wound around the forming drum body (7), and a cylindrical tire member (M) is manufactured.

There is provided a tire production method and system that reduce time loss due to material replenishment to improve work efficiency in a tire forming step, while downsizing the forming device. Materials in a wound state are stocked in a plurality of supply units arranged side by side for each material. A pair of bead members (MC) are stocked in a plurality of bead supply units (11). Each material cut into a predetermined length is supplied to a band drum (3) and a belt drum (4) by a supply conveyor via a slide conveyor to form an inner circumferential member (MA) and an outer circumferential member (MB). A green tire (G) is formed on the shaping drums (2) by using the inner circumferential member (MA), the outer circumferential member (MB), and the pair of bead members (MC). Axial centers (C1) of the drums (2) and (3) are coaxially aligned in transferring each material, and the drum axial centers (C2) of the drums (3) and (4) are coaxially aligned in transferring each material. While each material is being supplied from the other of the supply units, one of the supply units that is empty is replaced with a new supply unit with the material stocked.

Provided is a manufacturing device and method for a cylindrical tire member for accurately grasping a positioning degree in winding a band-like tire material around a forming drum body by moving the forming drum body in a width direction and positioning the band-like tire material at a reference position and for making a space required for a sensor to be used for grasping the positioning degree compact. A connecting portion configured to move a sensor (10) in a drum width direction together with a forming drum body (6) includes an extending portion (L) extending upward from the forming drum body (6) toward an opposite side of a conveyor (16a) at an inclination angle (S) of 30° or more and 60° or less with respect to a horizontal direction. The sensor (10) is disposed in the extending portion (L) in a side view. Based on widthwise position data of a tire material (M1) on the forming drum body (6) successively detected by the sensor (10) and data on a widthwise installation position of the sensor (10) with respect to the forming drum body (6), a control unit (17) calculates a widthwise position of the tire material (M1) over its entire length with respect to a reference position in the width direction of the forming drum body (6).

Provided are a compact supply system and a method for manufacturing a cylindrical tire member, which can rapidly supply respective tire materials to be pasted in forward rotation and reverse rotation onto a forming drum body while suppressing unwanted misalignment, and can reduce time loss due to replenishment of tire materials. The respective tire materials M1 and M2 fed from the front and rear supply units 1A, 1A on one side in the parallel direction to the upstream conveyors 2, 2 at the upper and lower stages are transferred to the upstream conveyor 2, slide conveyor 3, and downstream conveyor 4 at the upper stage, which are uniformly inclined upward, and to the upstream conveyor 2, slide conveyor 3, and downstream conveyor 4 at the lower stage, which are uniformly inclined downward, and are sequentially supplied to the forming drum body 6 in a fixed-length cut state, and by sliding the two-stage slide conveyor 3, the tire materials M1 and M2 fed from the front and rear supply units 1B, 1B on the other side in the parallel direction and cut to a fixed length are similarly sequentially supplied to the forming drum body 6.

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To improve wear resistance performance while ensuring performance on ice and snow and wet performance. A pneumatic tire (1) includes: a circumferential main groove (31) linearly formed along a tire circumferential direction; a circumferential groove (32) formed along the tire circumferential direction and including the inclined portion (32A) that is inclined in a predetermined direction with respect to the tire circumferential direction and continues in a zigzag shape in the tire circumferential direction; a circumferential auxiliary groove (33) that is provided between the circumferential groove (32) and the circumferential main groove (31), is adjacent to the inclined portion (32A) in the tire width direction, and is inclined in a direction opposite to the predetermined direction of the inclined portion (32A) with respect to the tire circumferential direction; a width-direction connecting groove (34) connecting both ends (32Aa, 33a) of the inclined portion (32A) and the circumferential auxiliary groove (33) and defining a block continuing in the tire circumferential direction; and a width-direction auxiliary groove (35) connecting a central portion of the circumferential auxiliary groove (33) and the circumferential main groove (31) and disposed mismatched with the width-direction connecting groove (34).

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