Bead pressing force prediction method, tire manufacturing method, and tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorChieko AOKI
Life of this patent
Estimating the term…
Abstract
A method for predicting a pressing force of a bead portion of a tire having a bead core in the bead portion, comprises a step of predicting the pressing force of the bead portion when the tire is fitted onto a rim of a wheel by using a numeric expression including at least the inner diameter of the bead core, the diameter of the rim, and the thickness inward in the tire radial direction from the bead core.
Claims11
A bead pressing force prediction method, which is a method for predicting a pressing force of a bead portion of a tire equipped with a bead core in the bead portion, and which comprises a step of predicting the pressing force of the bead portion when the tire is fitted onto a rim of a wheel by using the following numeric expression (1):
- [
- Exp
- .
- 1
- ]
-
- BF
- =
- a
-
- 1
- ×
- ε
-
- c
- +
- a
-
- 2
- (
- 1
- )
- ε
-
- c
- =
- (
- 1
- -
- (
- IDw
- -
- ODR
- )
- ×
- 0.5
- Ct
- )
- ×
- 100
- wherein
- BF:
- the bead pressing force [N]
- εc:
- compressive strain on the inside in the radial direction of the tire of the bead core 5 [%]
- IDw:
- the inner diameter of the bead core 5 [mm]
- ODR:
- the diameter of the rim [mm]
- Ct:
- a thickness inward in the radial direction of the tire from the bead core 5 [mm]
- a1:
- a coefficient for obtaining the pressing force BF from the compressive strain cc
- a2:
- a constant.
A bead pressing force prediction method, which is a method for predicting a pressing force of a bead portion of a tire equipped with a bead core in the bead portion, the bead core being composed of a bead wire, and which comprises a step of predicting the pressing force of the bead portion when the tire is fitted onto a rim of a wheel by using the following numeric expression (2):
- [
- Exp
- .
- 2
- ]
-
- BF
- =
- a
-
- 3
- ×
- ε
-
- c
- +
- a
-
- 4
- ×
- BWST
- +
- a
-
- 5
- (
- 2
- )
- ε
-
- c
- =
- (
- 1
- -
- (
- IDw
- -
- ODR
- )
- ×
- 0.5
- Ct
- )
- ×
- 100
- BWST
- =
- BWd
- ×
- BWdn
- wherein
- BF:
- the bead pressing force [N]
- εc:
- compressive strain on the inside in the tire radial direction of the bead core 5 [% }
- IDw:
- the inner diameter of the bead core 5 [mm]
- ODR:
- the diameter of the rim [mm]
- Ct:
- a thickness inward in the tire radial direction from the bead core 5 [mm]
- BWST:
- a bead wire configuration
- BWd:
- a wire diameter of the bead wire [mm]
- BWdn:
- a number of the bead wires 8 arranged on the most inside in the tire radial direction [integer]
- a3:
- a coefficient for obtaining the pressing force from the compressive strain
- a4:
- a coefficient for obtaining the pressing force from the bead wire configuration
- a5:
- a constant.
A bead pressing force prediction method, which is a method for predicting a pressing force of a bead portion of a tire equipped with a bead core in the bead portion, and which comprises a step of predicting the pressing force of the bead portion when the tire is fitted onto a rim of a wheel by using the following numeric expression (3):
- BF=a6×BOW+a7 (3)
- wherein
- BF:
- the pressing force of the bead portions 4 [N]
- BOW:
- a distance between the center 5c in the tire axial direction of the bead core 5 and the outer surface 4a in the tire axial direction of the bead portion 4 [mm]
- a6:
- a coefficient
- a7:
- a constant.
A bead pressing force prediction method, which is a method for predicting a pressing force of a bead portion of a tire equipped with a bead core in the bead portion, and which comprises a step of predicting the pressing force of the bead portion when the tire is fitted onto a rim of a wheel by using the following numeric expression (4):
- [
- Exp
- .
- 4
- ]
-
- BF
- =
- a
-
- 8
- ×
- BOW
- +
- a
-
- 9
- ×
- ε
-
- c
- +
- a
-
- 10
- (
- 4
- )
- ε
-
- c
- =
- (
- 1
- -
- (
- IDw
- -
- ODR
- )
- ×
- 0.5
- Ct
- )
- ×
- 100
- wherein
- BF:
- the pressing force of the bead portions 4 [N]
- BOW:
- a distance between the center 5c in the tire axial direction of the bead core 5 and the outer surface 4a in the tire axial direction of the bead portion 4 [mm]
- εc:
- compressive strain on the inside in the tire radial direction of the bead core 5 [%]
- IDw:
- the inner diameter of the bead core 5 [mm]
- ODR:
- the diameter of the rim [mm]
- Ct:
- a thickness inward in the tire radial direction from the bead core 5 [mm]
- a8, a9:
- coefficients
- a10:
- a constant.
A bead pressing force prediction method, which is a method for predicting a pressing force of a bead portion of a tire equipped with a bead core in the bead portion, the bead core being composed of a bead wire, and which comprises a step of predicting the pressing force of the bead portion when the tire is fitted onto a rim of a wheel by using the following numeric expression (5):
- [
- Exp
- .
- 5
- ]
-
- BF
- =
- a
-
- 11
- ×
- BOW
- +
- a
-
- 12
- ×
- ε
-
- c
- +
- a
-
- 13
- ×
- BWST
- +
- a
-
- 14
- (
- 5
- )
- ε
-
- c
- =
- (
- 1
- -
- (
- IDw
- -
- ODR
- )
- ×
- 0.5
- Ct
- )
- ×
- 100
- BWST
- =
- BWd
- ×
- BWdn
- wherein
- BF:
- the pressing force of the bead portions 4 [N]
- BOW:
- a distance between the center 5c in the tire axial direction of the bead core 5 and the outer surface 4a in the tire axial direction of the bead portion 4 [mm]
- εc:
- compressive strain on the inside in the tire radial direction of the bead core 5 [%}
- BWST:
- a width of the bead core 5 at the innermost position in the radial direction of the tire [mm]
- IDw:
- the inner diameter of the bead core 5 [mm]
- ODR:
- the diameter of the rim [mm]
- Ct:
- a thickness inward in the tire radial direction from the bead core 5 [mm]
- BWd:
- a wire diameter of the bead wire [mm]
- BWdn:
- a number of the bead wire(s) 8 arranged on the most inside in the tire radial direction [integer]
- a11 a12, a13:
- coefficients
- a14:
- a constant.
Dependencies are inferred from the claim text.