US 2026/0287093 A1Published application

Silicone rubber hose

AssigneeToyox Co., Ltd.

InventorKazuya YONEDA

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Abstract

The silicone rubber hose includes a reinforcement material wound between the inner layer 1 and the outer layer 2, wherein the durometer A hardness of a silicone rubber forming the inner layer 1 is 55 to 85, the durometer A hardness of a silicone rubber forming the outer layer 2 is 35 to 65, the silicone rubber has a tear strength (Sa) of 5 to 60 N/mm, and the ratio of the viscoelastic recovery rate defined by the following formula (1) and the permanent strain rate defined by the following formula (2) (viscoelastic recovery rate/permanent strain rate) is 2.2 or more in the silicone rubber to form the outer layer 2: viscoelastic ⁢ recovery ⁢ rate = { ( elongation ⁢ deformation ⁢ amount - stress ⁢ residual ⁢ deformation ⁢ recovery ⁢ amount - residual ⁢ strain ⁢ amount ) ⁠ / elongation ⁢ deformation ⁢ amount } × 100 ( 1 ) and permanent ⁢ strain ⁢ rate = ( residual ⁢ strain ⁢ amount / elongation ⁢ deformation ⁢ amount ) × 100. ( 2 )

Claims8

Dependent claims

A silicone rubber hose, which has a reinforcement material wound between an inner layer and an outer layer, wherein:

the inner layer is formed from a silicon rubber having a durometer A hardness in the range of 60 to 81,
the outer layer is formed from a silicon rubber having a durometer A hardness in the range of 38 to 63,
the silicone rubber forming the inner layer has a tear strength (Sa) in the range of 10 to 35 N/mm measured in accordance with JIS-K-6252,
the silicone rubber forming the outer layer has a tear strength (Sa) in the range of 15 to 56 N/mm measured in accordance with JIS-K-6252, and
a ratio of a viscoelastic recovery rate defined by a formula (1) below and a permanent strain rate defined by a formula (2) below (viscoelastic recovery rate/permanent strain rate) is 2.2 or more in the silicone rubber forming the outer layer:
Viscoelastic
⁢
recovery
⁢
rate
=
{
(
elongation
⁢
deformation
⁢
amount
-
stress
⁢
residual
⁢
deformation
⁢
recovery
⁢
amount
-
residual
⁢
strain
⁢
amount
)
⁠
/
elongation
⁢
deformation
⁢
amount
}
×
100
;
(
1
)
and
Permanent
⁢
strain
⁢
rate
=
(
residual
⁢
strain
⁢
amount
/
elongation
⁢
deformation
⁢
amount
)
×
100.
(
2
)

71 more elements

A silicone rubber hose, which has a reinforcement material wound between an inner layer and an outer layer, wherein:

the inner layer is formed from a silicon rubber having a durometer A hardness of 70,
the outer layer is formed from a silicon rubber having a durometer A hardness of 48,
the silicone rubber forming the inner layer has a tear strength (Sa) of 26 N/mm measured in accordance with JIS-K-6252,
the silicone rubber forming the outer layer has a tear strength (Sa) of 40 N/mm measured in accordance with JIS-K-6252, and
a ratio of a viscoelastic recovery rate defined by a formula (1) below and a permanent strain rate defined by a formula (2) below (viscoelastic recovery rate/permanent strain rate) is 2.5 or more in the silicone rubber forming the outer layer:
Viscoelastic
⁢
recovery
⁢
rate
=
{
(
elongation
⁢
deformation
⁢
amount
-
stress
⁢
residual
⁢
deformation
⁢
recovery
⁢
amount
-
residual
⁢
strain
⁢
amount
)
⁠
/
elongation
⁢
deformation
⁢
amount
}
×
100
;
(
1
)
and
Permanent
⁢
strain
⁢
rate
=
(
residual
⁢
strain
⁢
amount
/
elongation
⁢
deformation
⁢
amount
)
×
100.
(
2
)

71 more elements

Dependencies are inferred from the claim text.