Pneumatic tire
A pneumatic tire ( 1 ) including: a belt layer ( 20 ); and a belt reinforcing layer ( 30 ), in which: a filament diameter of each of steel cords of belt ply ( 21 ) is more than 0.10 mm and less than 0.25 mm; and A, B, and C satisfy relationships represented by the following, Expression (I): B/A<400 and Expression (II): 600<C/A<2000, where: A [N/inch] is a bending load per unit width of a sheet of the belt ply ( 21 ); B [N/inch] is a product of a load at 2% elongation of each of organic fiber cords of belt reinforcing ply ( 31 ) [N/cord] and the number of the organic fiber cords [cord/inch]; and C [N/inch] is a product of a load at 5% elongation of each of the organic fiber cords [N/cord] and the number of the organic fiber cords [cord/inch].
1 . A pneumatic tire comprising:
a carcass;
a belt layer arranged on an outer circumference of a crown of the carcass; and
a belt reinforcing layer arranged on an outer circumference of the belt layer, wherein
the belt layer has belt ply in which steel cords are arranged at an angle to a tire circumferential direction,
the belt reinforcing layer has a belt reinforcing ply on the outer circumference of the belt layer, the belt reinforcing ply having organic fiber cords arranged in the tire circumferential direction,
a filament diameter of each steel cord is more than 0.10 mm and less than 0.25 mm,
each organic fiber cord is a composite fiber cord formed by twisting yarn made of aliphatic polyamide fibers with yarn made of aromatic polyamide fibers,
a fineness of the aliphatic polyamide fibers is 900 dtex or more, and
A, B, and C satisfy relationships represented by the following Expression (I) and Expression (II),
B
/
A
<
400
Expression
(
I
)
600
<
C
/
A
<
2000
Expression
(
II
)
where: the A [N/inch] is a bending load per unit width of a sheet of the belt ply;
B [N/inch] is a product of a load at 2% elongation of each of the organic fiber cords [N/cord] and the number of the organic fiber cords implanted in the belt reinforcing ply [cord/inch]; and
C [N/inch] is a product of a load at 5% elongation of each of the organic fiber cords [N/cord] and the number of the organic fiber cords implanted in the belt reinforcing ply [cord/inch].
2 . The pneumatic tire according to claim 1 , wherein in-plane rigidity of the belt ply is 9 [kN/inch] or more.
3 . The pneumatic tire according to claim 1 , wherein A is 1.5 or more and 4.5 or less.
4 . The pneumatic tire according to claim 1 , wherein B is 400 or more and 1000 or less.
5 . The pneumatic tire according to claim 1 , wherein C is 1400 or more and 3000 or less.
6 . The pneumatic tire according to claim 1 , wherein a ratio (B/A) of B to A satisfies 50<B/A<300.
7 . The pneumatic tire according to claim 1 , wherein a ratio (C/A) of C to A satisfies 800<C/A<1200.
8 . The pneumatic tire according to claim 1 , wherein a filament diameter of each steel cord is 0.14 mm or more and 0.21 mm or less.