High-pressure hose comprising several layers of reinforcing plies

• US 7,143,789 B2
• Filed: 04/07/2005
• Issued: 12/05/2006
• Est. Priority Date: 04/07/2004
• Status: Active Grant

• Current Assignee: Contitech Rubber Industrial Gumiipari Korlatolt Felelossegu Tarsasag
• Original Assignee: Phoenix Rubber Gumiipari Kft.
• Inventors: Nagy, Tibor, Boros, Andras
• Primary Examiner(s): BRINSON, PATRICK F
• Application Number:
  US11/101,295
• Publication Number:
  US 20050241716A1
• Time in Patent Office: 607 Days
• Field of Search: 138/130, 138/129, 138/172, 138/127, 138/124, 138/125, 138/137, 138/140, 138/123, 138/174
• US Class Current: 138/123
• CPC Class Codes: F16L 11/083 three or more layers

Abstract

The present invention relates to a high-pressure hose structure comprising several layers of reinforcing plies where the reinforcing fibers are spirally laid.

The hose structure according to the invention is characterized by the odd number of its reinforcing plies.

Claims

1. A high-pressure hose comprising several layers of spirally laid reinforcing plies, wherein the number of reinforcing plies is odd, a lay angle (α

_k) of at least one of said plies as measured from a cross section perpendicular to a hose axis is lower than 10 degrees, a number of fibres (N_k) in the at least one of said plies is lower than

$\begin{array}{cc}\mathrm{ABS}\left(\frac{\underset{i=1}{\overset{n,i\ne <br><br>k}{\sum <br><br>}}<br><br>3<br><br>{\mathrm{mr}}_i<br><br>N_i<br><br>F_i<br><br>\cos <br><br><br><br>a_1}{r_k<br><br>F_k}\right)><br><br>N_k& \left(1\right)\end{array}$

where

index k refers to the low-angle at least one of said plies,

index i is a running index, except the low-angle at least one of said plies,

m is a sign function whose value is +1 for left-handed and −

1 for right-handed plies,

r_i and r_k are the mean radii of the respective plies,

N_i and N_k are numbers of fibres in the respective plies,

F_i and F_k are the tensile breaking forces of the fibres in the respective plies,

n is the number of plies,

ABS means absolute value,

and all the plies together fulfill the following inequality

$\begin{array}{cc}0,36<br><br>\underset{j=1}{\overset{n}{\sum <br><br>}}<br><br>\frac{N_j<br><br>F_j}{\sin <br><br><br><br>a_j}><br><br>\underset{j=1}{\overset{n}{\sum <br><br>}}<br><br>N_j<br><br>F_j<br><br>\sin <br><br><br><br>a_j><br><br>0,3<br><br>\underset{j=1}{\overset{n}{\sum <br><br>}}<br><br>\frac{N_j<br><br>F_j}{\sin <br><br><br><br>a_j}& \left(2\right)\end{array}$

 

where

j is a running index, including the low-angle of the at least one of said plies.

2. A hose according to claim 1, wherein the individual plies comprise essentially identical reinforcing fibres.

3. A hose according to claim 1, wherein the number of fibres (n_k) in the at least one of said plies is not greater than 10% of all ply fibres and the other plies defining an average lay angle of higher than 35.26°

.

4. A hose according to claim 1, wherein the odd number of reinforcing plies comprises three reinforcing plies, the uppermost ply is laid at a low angle and the angles of the two lower reinforcing plies do not differ by more than ±

3 degrees from those determined by equations

sin α

₁=0.707+0.19z

sin α

₂=0.707−

0.19z

where

z is the relative ply distance, i.e. the difference of the mean radii of the two extreme plies divided byte mean radius r₂ of the second ply, z=(r₃−

r₁)/r₂.

5. A hose according to claim 1, wherein the odd number of reinforcing plies comprises five reinforcing plies, the uppermost ply is laid at a low angle and the angles of the four lower reinforcing plies do not differ by more than ±

3 degrees from those determined by equations

sin α

₁=0.646+0.28z

sin α

₂=0.646+0.09z

sin α

₃=0.646−

0.08z

sin α

₄=0.646−

0.23z

where

z is the relative ply distance, i.e. the difference of the mean radii of the two extreme plies divided by the mean radius of the third ply, z=(r₅−

r₁)/r₃.

6. A hose according to claim 1, wherein the odd number of reinforcing plies comprises seven reinforcing plies, the uppermost ply is laid at a low angle and the angles of the six lower reinforcing plies do not differ by more than ±

3 degrees from those determined by equations

sin α

₁=0.624+0.34z

sin α

₂=0.624+0.18z

sin α

₃=0.624+0.06z

sin α

₄=0.624−

0.05z

sin α

₅=0.624−

0.15z

sin α

₆=0.624−

0.23z

where

z is the relative ply distance, i.e. the difference of the mean radii of two extreme plies divided by the mean radius of the fourth ply, z=(r₇−

r₁)/r₄.

7. A hose according to claim 1, wherein the odd number of reinforcing plies comprises three reinforcing plies, the uppermost ply is laid at a low angle and the angles of the two lower reinforcing plies do not differ by more than +3 degrees from those determined by equations

sin α

₁=0.707+0.73z

sin α

₂=0.707−

0.39z

where

z is the relative ply distance, i.e. the difference of the mean radii of the two extreme plies divided by the mean radius of the second ply, z=(r₃−

r₁)/r₂.

8. A hose according to claim 1, wherein the odd number of reinforcing plies comprises five reinforcing plies, the uppermost ply is laid at a low angle and the angles of the four lower reinforcing plies do not differ by more than ±

3 degrees from those determined by equations

sin α

₁=0.646+0.59z

sin α

₂=0.646+0.36z

sin α

₃=0.646−

0.09z

sin α

₂=0.646−

0.63z

where

z is the relative ply distance, i.e. the difference of the mean radii of the two extreme plies divided by the mean radius of the third ply, z=(r₅−

r₁)/r₃.

9. A hose according to claim 1, wherein the odd number of reinforcing plies comprises seven reinforcing plies, the uppermost ply is laid at a low angle and the angles of the six lower reinforcing plies do not differ by more than ±

3 degrees from those determined by equations

sin α

₁=0.624+0.75z

sin α

₂=0.624+0.58z

sin α

₃=0.624+0.18z

sin α

₄=0.624−

0.17z

sin α

₅=0.624−

0.41z

sin α

₆=0.624−

0.46z

where

z is the relative ply distance, i.e. the difference of the mean radii of the two extreme plies divided by the mean radius of the fourth ply, z=(r₇−

r₁)/r₄.

10. A hose according to claim 1, wherein an uppermost one of the plies is laid at a low angle and angles of lower reinforcing ones of the plies fall between values determined by

sin α

₁=0.707+0.19z

sin α

₂=0.707−

0.19z

and

sin α

₁=0.707+0.73z

sin α

₂=0.707−

0.39z

where

z is a relative ply distance comprising a difference between mean radii of extreme ones of the plies divided by a mean radius of an intermediate one of the plies.

11. A hose according to claim 1, wherein an uppermost one of the plies is laid at a low angle and angles of lower reinforcing ones of the plies fall between values determined by

sin α

₁=0.646+0.28z

sin α

₂=0.646+0.09z

sin α

₃=0.646−

0.08z

sin α

₄=0.646−

0.23z

and

sin α

₁=0.646+0.59z

sin α

₂=0.646+0.36z

sin α

₃=0.646−

0.09z

sin α

₂=0.646−

0.63z

where

z is a relative ply distance comprising a difference between mean radii of extreme ones of the plies divided by a mean radius of an intermediate one of the plies.

12. A hose according to claim 1, wherein an uppermost one of the plies is laid at a low angle and angles of lower reinforcing ones of the plies fall between values determined by

sin α

₁=0.624+0.34z

sin α

₂=0.624+0.18z

sin α

₃=0.624+0.06z

sin α

₄=0.624−

0.05z

sin α

₅=0.624−

0.15z

sin α

₆=0.624−

0.23z

and

sin α

₁=0.624+0.75z

sin α

₂=0.624+0.58z

sin α

₃=0.624+0.18z

sin α

₄=0.624−

0.17z

sin α

₅=0.624−

0.41z

sin α

₆=0.624−

0.46z

where

z is a relative ply distance comprising a difference between mean radii of extreme ones of the plies divided by a mean radius of an intermediate one of the plies.

13. A high-pressure hose comprising several layers of spirally laid reinforcing plies, wherein the number of reinforcing plies is odd and a number of fibres (N_k) in at least one of said plies is lower than

$\begin{array}{c}\mathrm{ABS}(\frac{\sum _{}^{}}{}\end{array}$

i = 1 n , i ≠

k ⁢

⁢

3 ⁢

mr i ⁢

N i ⁢

F i ⁢

cos ⁢

⁢

a 1 r k ⁢

F k ) >

N k ( 1 )

where

index k refers to the low-angle at least one of said plies,

index i is a running index, except the low-angle at least one of said plies,

m is a sign function whose value is +1 for left-handed and −

1 for right-handed plies,

r_i and r_k are the mean radii of the respective plies,

N_i and N_k are numbers of fibres in the respective plies,

F_i and F_k are the tensile breaking forces of the fibres in the respective plies,

n is the number of plies,

ABS means absolute value.

14. A high-pressure hose comprising several layers of spirally laid reinforcing plies, wherein the number of reinforcing plies is odd and all plies together fulfill the following inequality

$\begin{array}{c}0,36\end{array}$

∑

j = 1 n ⁢

⁢

N j ⁢

F j sin ⁢

⁢

α

j >

∑

j = 1 n ⁢

N j ⁢

F j ⁢

sin ⁢

⁢

α

j >

0 , 3 ⁢

∑

j = 1 n ⁢

N j ⁢

F j sin ⁢

⁢

a j ( 2 )

where

j is a running index, including the low-angle of at least one of said plies,

N_j is a number of fibres in the respective plies,

F_j is the tensile breaking force of the fibres in the respective plies, and

n is the number of plies.