Abstract: An apparatus for manufacturing a pneumatic tire, comprises: a cylindrical former for forming a tire base from rubber members, a carcass and bead cores; and bead lock devices arranged at both ends of the former in its axial direction. Each bead lock device is expandable and contractable in diameter, and comprises a holding portion for supporting the bead core from the inside in the radial direction when expanded. The holding portion comprises an axially inner flange, an axially outer flange, and a bottom surface connecting therebetween. The height of the axially inner flange is greater than the height of the outer flange by 5 mm or more.

Abstract: A tire comprises a tread portion provided with zigzag circumferential grooves and lateral grooves so that hexagonal blocks are formed between the zigzag circumferential grooves. Corners of the hexagonal blocks adjacent to each other through the lateral grooves are partially chamfered to have chamfered parts, with respect to each of the lateral grooves, the chamfered part of the corner of the hexagonal block abutting on the lateral groove on one side in the tire circumferential direction is located in a different position in the longitudinal direction of the lateral groove than the chamfered part of the corner of the hexagonal block abutting on the lateral groove on the other side in the tire circumferential direction.

Abstract: A heavy-duty tire includes a tire sidewall (K) provided on a surface (Ks) thereof with a belt-like shaped serration extending in a tire circumferential direction. The serration is formed of a plurality of radially extending ridges arranged adjacently in the tire circumferential direction.

Abstract: A heavy-duty tire includes a tread part formed such that the tread part includes a crown profile including tire equator, and a pair of shoulder profiles extending from outer sides of the crown profile to tread edges. In a tire cross section including tire rotation axis in 5% internal pressure state in which the tire is mounted to a normal rim, filled with air at internal pressure of 5% of normal internal pressure and loaded with no load, each of the crown and shoulder profiles has an arc shape convex toward tire radial direction outer side such that ratio Rc/Rs of curvature radius Re of the crown profile to curvature radius Rs of each shoulder profile is 7.0 or more, and a tire axial direction distance from the equator to a connecting point between the crown profile and each shoulder profile is 0.70 or more times a tread half width.

Abstract: A heavy duty tire comprises a tread portion 2 divided into two crown land regions 6, two middle land regions 7 and two shoulder land regions 8 by a center circumferential groove 3 having a width Wc, two middle circumferential grooves 4 having a width Wm and two shoulder circumferential grooves 5 having a width Ws. The distance LA from the shoulder circumferential groove 5 to the tire equator Co is more than the distance LB from the shoulder circumferential groove 5 to the tread edge TE. The width Wc and width Wm are more than 3.0 mm and less than 6.0 mm. The width Ws is more than 5.0 mm, and more than the width Wc and more than the width Wm. The crown and middle land regions 6 and 7 are each formed as a rib. The shoulder land regions 8 are each formed as a row of shoulder blocks 13.

Abstract: The aspect ratio of this tire 2 is not greater than 75%. The tire 2 includes: a carcass 12 extending from one bead 8 to the other bead 8; a belt 14 located between a tread 4 and the carcass 12; and a cushion layer 16 located between an end 54 of the belt 14 and the carcass 12. Each bead 8 includes a core 34 and an apex 36. The zone from the inner end of the cushion layer 16 to the outer end of the apex 36 is a flexible zone. The ratio of a length F in the radial direction of the flexible zone to a cross-sectional height A of the carcass 12 is not less than 0.25 and not greater than 0.4.

Abstract: A tire comprises a tread portion provided with zigzag circumferential grooves and lateral grooves so that hexagonal blocks are formed between the zigzag circumferential grooves. Corners of the hexagonal blocks adjacent to each other through the lateral grooves are partially chamfered to have chamfered parts, with respect to each of the lateral grooves, the chamfered part of the corner of the hexagonal block abutting on the lateral groove on one side in the tire circumferential direction is located in a different position in the longitudinal direction of the lateral groove than the chamfered part of the corner of the hexagonal block abutting on the lateral groove on the other side in the tire circumferential direction.

Abstract: A heavy duty pneumatic tire comprises a tread portion provided with circumferentially continuously extending main grooves and axial grooves connecting between the main grooves to form blocks. The main grooves include a zigzag crown main groove disposed on each side of the tire equator, and a zigzag shoulder main groove disposed axially outside each crown main groove, wherein the groove width of the crown main groove is less than the groove width of the shoulder main groove. The axial grooves include crown axial grooves circumferentially dividing crown blocks disposed between the crown main grooves and each having a substantially hexagonal tread, and middle axial grooves circumferentially dividing middle blocks disposed between each crown main groove and the adjacent shoulder main groove and each having a substantially hexagonal tread, wherein the groove width of the middle axial grooves is more than the groove width of the crown axial grooves.

Abstract: A heavy-duty tire includes a tread having a main groove continuously extending in a tire circumferential direction, and a first land portion and a second land portion formed adjacent to each other such that the main groove is formed between the first land portion and the second land portion. The first land portion has first lateral grooves such that each first second lateral groove is curved in an S shape, the second land portion has second lateral grooves such that each second lateral groove is curved in an S shape, the first and second lateral grooves are connected such that the first lateral grooves and the second lateral grooves make smooth transition through the main groove, and each of the first and second lateral grooves has a widened portion at position connected to the main groove such that the widened portion increases a groove width gradually toward the main groove.

Abstract: A heavy duty tire comprises a tread portion 2 divided into two crown land regions 6, two middle land regions 7 and two shoulder land regions 8 by a center circumferential groove 3 having a width Wc, two middle circumferential grooves 4 having a width Wm and two shoulder circumferential grooves 5 having a width Ws. The distance LA from the shoulder circumferential groove 5 to the tire equator Co is more than the distance LB from the shoulder circumferential groove 5 to the tread edge TE. The width Wc and width Wm are more than 3.0 mm and less than 6.0 mm. The width Ws is more than 5.0 mm, and more than the width Wc and more than the width Wm. The crown and middle land regions 6 and 7 are each formed as a rib. The shoulder land regions 8 are each formed as a row of shoulder blocks 13.

Abstract: A heavy-duty tire includes a tire sidewall (K) provided on a surface (Ks) thereof with a belt-like shaped serration extending in a tire circumferential direction. The serration is formed of a plurality of radially extending ridges arranged adjacently in the tire circumferential direction.

Abstract: A heavy-duty tire includes a tread part formed such that the tread part includes a crown profile including tire equator, and a pair of shoulder profiles extending from outer sides of the crown profile to tread edges. In a tire cross section including tire rotation axis in 5% internal pressure state in which the tire is mounted to a normal rim, filled with air at internal pressure of 5% of normal internal pressure and loaded with no load, each of the crown and shoulder profiles has an arc shape convex toward tire radial direction outer side such that ratio Rc/Rs of curvature radius Re of the crown profile to curvature radius Rs of each shoulder profile is 7.0 or more, and a tire axial direction distance from the equator to a connecting point between the crown profile and each shoulder profile is 0.70 or more times a tread half width.

Abstract: A heavy-duty tire includes a tread having a main groove continuously extending in a tire circumferential direction, and a first land portion and a second land portion formed adjacent to each other such that the main groove is formed between the first land portion and the second land portion. The first land portion has first lateral grooves such that each first second lateral groove is curved in an S shape, the second land portion has second lateral grooves such that each second lateral groove is curved in an S shape, the first and second lateral grooves are connected such that the first lateral grooves and the second lateral grooves make smooth transition through the main groove, and each of the first and second lateral grooves has a widened portion at position connected to the main groove such that the widened portion increases a groove width gradually toward the main groove.

Abstract: A heavy duty pneumatic tire comprises a tread portion provided with circumferentially continuously extending main grooves and axial grooves connecting between the main grooves to form blocks. The main grooves include a zigzag crown main groove disposed on each side of the tire equator, and a zigzag shoulder main groove disposed axially outside each crown main groove, wherein the groove width of the crown main groove is less than the groove width of the shoulder main groove. The axial grooves include crown axial grooves circumferentially dividing crown blocks disposed between the crown main grooves and each having a substantially hexagonal tread, and middle axial grooves circumferentially dividing middle blocks disposed between each crown main groove and the adjacent shoulder main groove and each having a substantially hexagonal tread, wherein the groove width of the middle axial grooves is more than the groove width of the crown axial grooves.