US 12,163,280 B2Granted

Two-layer multi-strand cable having an improved surface energy-to-break

AssigneeCompagnie Generale Des Etablissements Michelin

InventorsMarianna Chevalley, Stephane Laurent, Romain Barbat, Alexandre Gianetti, Benoit Renaux

Life of this patent

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Abstract

A multi-strand cord (50) comprises an internal layer (CI) made up of K=1 internal strand (TI) having two layers (C1, C3), with the internal layer (C1) being made up of Q internal metallic threads (F1) and the external layer (C3) being made up of N external metallic threads (F3), and an external layer (CE) made up of L>1 external strands (TE) having two layers (C1′, C3′) wound around the internal layer (CI), with the internal layer (C1′) being made up of Q′ internal metallic threads (F1′) and the external layer (C3′) being made up of N′ external metallic threads (F3′). The cord (50) has an energy-to-break per unit area ES≥145 N·mm−1 with E ⁢ S = ∑ i = 1 N ⁢ c ⁢ F m ⁢ i × ∑ i = 1 N ⁢ c ⁢ A t ⁢ i / Nc × Cfrag / D where ∑ i = 1 N ⁢ c ⁢ F m ⁢ i is the sum of the forces at break, ∑ i = 1 N ⁢ c ⁢ A t ⁢ i is the sum of the total elongation, Cfrag is the coefficient of weakening, and D is the diameter.

Claims16

Dependent claims

A two-layer multi-strand cord (50) comprising:

an internal layer CI of the cord made up of K=1 internal strand TI having two layers C1, C3 comprising:
an internal layer C1 of the internal strand TI made up of Q=2, 3 or 4 internal metallic threads F1, and
an external layer C3 of the internal strand TI made up of N external metallic threads F3 of diameter d3 wound around the internal layer C1;
and
an external layer CE of the cord made up of L>1 external strands TE, each external strand TE having two layers C1′, C3′ wound around the internal layer CI of the cord, comprising:
an internal layer C1′ of external strand TE made up of Q′=2, 3 or 4 internal metallic threads F1′, and
an external layer C3′ of external strand TE made up of N′ external metallic threads F3′ of diameter d3′ wound around the internal layer C1′ of external strand TE,
wherein the cord (50) has an energy-to-break per unit area ES≥155 N·mm−1 with
ES
=
∑
i
=
1
N
⁢
c
⁢
F
m
⁢
i
×
∑
i
=
1
N
⁢
c
⁢
A
t
⁢
i
/
Nc
×
Cfrag
/
D
where:
∑
i
=
1
Nc
F
mi
is a sum of forces at break for the Nc threads, in Newtons,
Nc=Q+N+L×(Q′+N′) is the total number of metallic threads,
D is the diameter of the cord, in mm,
∑
i
=
1
Nc
A
ti
is a sum of total elongation of the Nc threads and is dimensionless, and
Cfrag is a dimensionless coefficient of weakening of the cord (50), with
C
f
⁢
r
⁢
a
⁢
g
=
1
-
(
sin
⁡
(
∝
f
)
d
⁢
3
×
d
⁢
3
′
×
(
∑
i
=
1
Q
′
+
N
′
⁢
F
m
⁢
i
)
×
sin
⁡
(
α
⁢
t
)
N
×
C
⁢
s
⁢
t
⁢
e
)
where:
d3 and d3′ are expressed in mm,
αf is an angle of contact between the external metallic threads F3 of the internal strand TI and the external metallic threads F3′ of the external strands TE, expressed in radians,
αt is a helix angle of each external strand TE expressed in radians, and
Cste=1500 N·mm−2.

124 more elements

A cord (50′) extracted from a polymer matrix, the extracted cord (50′) comprising:

an internal layer CI of the cord made up of K=1 internal strand TI having two layers C1, C3 comprising:
an internal layer C1 of the internal strand TI made up of Q=2, 3 or 4 internal metallic threads F1, and
an external layer C3 of the internal strand TI made up of N external metallic threads F3 of diameter d3 wound around the internal layer C1;
and
an external layer CE of the cord made up of L>1 external strands TE, each external strand TE having two layers C1′, C3′ wound around the internal layer CI of the cord, comprising:
an internal layer C1′ of external strand TE made up of Q′=2, 3 or 4 internal metallic threads F1′, and
an external layer C3′ of external strand TE made up of N′ external metallic threads F3′ of diameter d3′ wound around the internal layer C1′ of external strand TE,
wherein the extracted cord (50′) has an energy-to-break ES′≥150 N·mm−1 with
ES
′
=
∑
i
=
1
Nc
F
mi
×
∑
i
=
1
Nc
A
ti
/
Nc
×
C
frag
′
/
D
where:
∑
i
=
1
Nc
F
mi
is a sum of forces at break for the Nc threads, in Newtons,
Nc=Q+N+L×(Q′+N′) is the total number of metallic threads,
D is the diameter of the cord, in mm,
∑
i
=
1
Nc
A
ti
is a sum of total elongation of the Nc threads and is dimensionless, and
Cfrag′ is the dimensionless coefficient of weakening of the cord (50′), with
C
frag
′
=
1
-
(
2
-
C
⁢
p
)
×
(
sin
⁡
(
∝
f
)
d
⁢
3
×
d
⁢
3
′
×
(
∑
i
=
1
Q
′
+
N
′
⁢
F
m
⁢
i
)
×
sin
⁡
(
α
⁢
t
)
N
×
C
⁢
s
⁢
t
⁢
e
)
where:
Cp is the penetration coefficient for the cord,
d3 and d3′ are expressed in mm,
αf is an angle of contact between the external metallic threads F3 of the internal strand TI and the external metallic threads F3′ of the external strands TE, expressed in radians,
αt is a helix angle of the external strands TE, expressed in radians, and
Cste=1500 N·mm−2.

121 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/778,687Filed 5 Nov 2020
Priority: FR 191307822 Nov 2019
Published: US 2022/0412000 A129 Dec 2022
Granted: 10 Dec 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

D07B 1/0613
Reinforcing cords for rubber or plastic articles: the reinforcing cords being characterised by the rope configuration
D07B 1/0633
The reinforcing cords being characterised by the strand configuration: having a multiple-layer configuration
D07B 1/066
Reinforcing cords for rubber or plastic articles: the wires being made from special alloy or special steel composition
D07B 1/0626
The reinforcing cords being characterised by the strand configuration: the reinforcing cords consisting of three core wires or filaments and at…