1. A heavy load radial tire comprising a carcass extending from a tread portion to a bead core of a bead portion through a sidewall portion, and a belt layer disposed radially outward of the carcass and in the tread portion, wherein
the belt layer includes
a second belt ply in which belt cords are arranged at an angle \u03b82 of 10 to 45\xb0 with respect to a circumferential direction of the tire,
a third belt ply which is disposed radially outward of the second belt ply, in which belt cords are arranged at an angle of \u03b83 of 10 to 45\xb0 with respect to the circumferential direction of the tire and an inclining direction of the belt cords of the third belt ply is opposite from that of the belt cords of the second belt ply, and
a fourth belt ply which is disposed radially outward of the third belt ply, in which a belt cord is spirally wound at an angle \u03b84 of not more than 5\xb0 with respect to the circumferential direction of the tire, wherein
ply widths W2 and W3 of the second and third belt plies in an axial direction of the tire are not less than 85% of a tread ground-contact width Tw,
a ply width W4 of the fourth belt ply in the axial direction of the tire is not less than 40 mm, a distance K between an outer end of the fourth belt ply in the axial direction of the tire to a tire equator is in a range of 35% to 40% of the tread ground-contact width Tw,
a difference W2\u2212W3 of the ply widths W2 and W3 of the second and third belt plies in the axial direction of the tire is not less than 14 mm,
a reinforcing rubber layer is disposed between outer ends of the second and third belt plies in the axial direction of the tire, a maximum thickness T1 of the reinforcing rubber layer is not less than 3.0 mm, and a complex elastic modulus E*1 of the reinforcing rubber layer is in a range of 6.0 to 12.0 MPa.
2. The heavy load radial tire according to claim 1, wherein the fourth belt ply is disposed at a distance from both sides of the tire equator.
3. The heavy load radial tire according to claim 2, wherein the belt layer includes a fifth belt ply above the tire equator and between a pair of the fourth belt plies, belt cords of the fifth belt ply are inclined at an angle \u03b85 of 10 to 45\xb0 with respect to the circumferential direction of the tire and in the same inclination direction as that of the belt cords of the third belt ply.
4. The heavy load radial tire according to claim 1, wherein the belt layer includes a first belt ply on the radially innermost side, belt cords of the first belt ply are inclined at an angle \u03b81 that is greater than the angle \u03b82 and in a range of 45 to 75\xb0 with respect to the circumferential direction of the tire.
5. The heavy load radial tire according to claim 1, wherein the reinforcing rubber layer has a maximum thickness T1 in an outer end of the third belt ply in the axial direction of the tire.
6. The heavy load radial tire according to claim 1, wherein an axially outer end portion of the belt layer is gradually separating from the carcass axially outward of the tire, a cushion rubber is disposed in this separating portion, a complex elastic modulus E*2 of the cushion rubber is in a range of 2.0 to 5.0 Mpa and is smaller than the complex elastic modulus E*1 of the reinforcing rubber layer.
7. The heavy load radial tire according to claim 6, wherein the cushion rubber includes a sheet-like auxiliary layer portion extending between the belt layer and the carcass to the tire equator, the auxiliary layer portion has a thickness of 0.5 to 2.0 m.
8. The heavy load radial tire according to claim 1, wherein a tread rubber includes a base rubber which is adjacent to the belt layer, and a cap rubber forming a tread surface, the complex elastic modulus E*1 of the reinforcing rubber layer is greater than a complex elastic modulus E*3 of the base rubber.
9. The heavy load radial tire according to claim 2, wherein the reinforcing rubber layer has a maximum thickness T1 in an outer end of the third belt ply in the axial direction of the tire.
10. The heavy load radial tire according to claim 3, wherein the reinforcing rubber layer has a maximum thickness T1 in an outer end of the third belt ply in the axial direction of the tire.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A portion of a nozzle configured to be used in an injection molding apparatus, comprising:
a tip including an outer surface and a tip melt passage therethrough, the outer surface having a groove formed therein;
a tip surrounding piece spaced from the tip and including an inner surface, the inner surface having a groove formed therein and adjacent the groove in the tip; and
a seal positioned within the groove of the tip and the groove of the tip surrounding piece, wherein the seal forms a seal with the tip and with the tip surrounding piece to inhibit melt leakage between the seal and the tip and between the seal and the tip surrounding piece, so that, in use, at least a portion of the tip and at least a portion of the tip surrounding piece are separated by an air gap.
2. The portion of the nozzle of claim 1, wherein the thermal conductivity of the seal is less than the thermal conductivity of the tip.
3. The portion of the nozzle of claim 1, wherein the thermal conductivity of the tip surrounding piece is less than the thermal conductivity of the tip.
4. The portion of the nozzle of claim 1, wherein the tip surrounding piece is made of a material that inhibits heat transfer.
5. The portion of the nozzle of claim 1, wherein the tip has a threaded portion.
6. The portion of the nozzle of claim 1, wherein the tip surrounding piece has a threaded portion.
7. The portion of the nozzle of claim 1, wherein the tip surrounding piece retains the tip in place through the seal.
8. The portion of the nozzle of claim 1, further comprising:
an insulator piece, wherein the tip surrounding piece is removeably coupled to the insulator piece.
9. The portion of the nozzle of claim 1, further comprising:
a fourth piece, wherein the tip surrounding piece is removeably coupled to the fourth piece and wherein the fourth piece has a lower thermal conductivity than a thermal conductivity of the tip surrounding piece.
10. The portion of the nozzle of claim 1, wherein:
the tip and the tip surrounding piece include downstream ends; and
the seal is positioned proximate a downstream end of at least one of the tip and the tip surrounding piece.
11. The portion of the nozzle of claim 1, wherein:
the tip has a threaded portion; and
the tip surrounding piece has a threaded portion.
12. A nozzle configured to be used in an injection molding apparatus, comprising:
a nozzle body, the nozzle body defining a nozzle body melt passage, wherein the nozzle body melt passage is adapted to be in fluid communication with an upstream melt source;
a tip including an outer surface and defining a tip melt passage that is in fluid communication with the nozzle body melt passage, the outer surface of the tip having a groove formed therein;
a tip surrounding piece spaced from the tip and including an inner surface, the inner surface having a groove formed therein and adjacent the groove in the tip; and
a seal positioned within the groove of the tip and the groove of the tip surrounding piece, wherein the seal forms a seal with the tip and with the tip surrounding piece to inhibit melt leakage between the seal and the tip and between the seal and the tip surrounding piece, so that, in use, at least a portion of the tip and at least a portion of the tip surrounding piece are separated by an air gap.
13. The nozzle as claimed in claim 12, wherein the thermal conductivity of the seal is less than the thermal conductivity of the tip.
14. The nozzle as claimed in claim 12, wherein the thermal conductivity of the tip surrounding piece is less than the thermal conductivity of the tip.
15. The nozzle as claimed in claim 12, wherein the tip has a first threaded portion for mating with a corresponding second threaded portion on the nozzle body.
16. The nozzle as claimed in claim 15, wherein the tip surrounding piece has a third threaded portion for mating with a corresponding fourth threaded portion on the nozzle body.
17. The nozzle as claimed in claim 12, wherein the tip surrounding piece retains the tip in place through the seal.
18. The nozzle as claimed in claim 12, further comprising:
an insulator piece, wherein the insulator piece is coupled to the nozzle body and the tip surrounding piece is coupled to the insulator piece.
19. The nozzle as claimed in claim 12, further comprising:
a fourth piece, wherein the fourth piece is connected to the nozzle body and the tip surrounding piece is connected to the fourth piece and wherein the fourth piece has a lower thermal conductivity than the thermal conductivity of the tip surrounding piece.
20. The nozzle as claimed in claim 12, wherein the tip surrounding piece is removably coupled to the nozzle body.
21. The nozzle of claim 12, wherein the tip and tip surrounding piece are both removably coupled to the nozzle body.