Vibration absorbing hose

• US 20020144743A1
• Filed: 01/29/2002
• Published: 10/10/2002
• Est. Priority Date: 01/31/2001
• Status: Active Grant

• Current Assignee: Tokai Rubber Industries Limited
• Original Assignee: Tokai Rubber Industries Limited
• Inventors: Daikai, Eiichi, Arima, Tetsuya
• Granted Patent: US 6,854,485 B2
• Time in Patent Office: Days
• US Class Current: 138/126
• CPC Class Codes: B32B 25/10 next to a fibrous or filamentary layer
• CPC Class Codes: F16L 11/045 with four or more layers without reinforcement
• CPC Class Codes: F16L 11/086 two layers
• CPC Class Codes: Y10T 428/1393 Multilayer [continuous layer]

Abstract

A vibration absorbing hose excellent in vibration absorbing property, mounting stability and shape retaining property. The vibration absorbing hose comprises at least one rubber layer composed of a rubber composition having a storage elastic modulus (E′) of 20 to 100 MPa at 200 Hz with an elongation strain of 0.1% at an ordinary temperature (about 20° C.), and a damping factor (tan δ) of not lower than 0.4.

Claims

1. A vibration absorbing hose comprising at least one rubber layer composed of a rubber composition having a storage elastic modulus (E′

) of 20 to 100 MPa at 200 Hz with an elongation strain of 0.1% at an ordinary temperature, and a damping factor (tan δ

) of not smaller than 0.4.

2. A vibration absorbing hose as set forth in claim 1, wherein the rubber composition has a 50% tensile stress (M50) of 1.0 to 4.0 MPa.

3. A vibration absorbing hose as set forth in claim 1, further comprising a reinforcing layer.

4. A vibration absorbing hose comprising a plurality of rubber layers, at least one of the rubber layers being composed of a rubber composition having a storage elastic modulus (E′

) of 20 to 100 MPa at 200 Hz with an elongation strain of 0.1% at an ordinary temperature, and a damping factor (tan δ

) of not smaller than 0.4.

5. A vibration absorbing hose as set forth in claim 4, wherein the rubber composition has a 50% tensile stress (M50) of 1.0 to 4.0 MPa.

6. A vibration absorbing hose as set forth in claim 4, wherein a value M calculated from the following expression (1) is 1.5 to 3.5 MPa:

M=(Ma5×

A+Mb50×

B+Mc5×

C+ . . . )/(A+B+C . . . ) 

 

(1)

(wherein Ma50, Mb50, Mc50 , . . . are 50% tensile stresses of rubber compositions composing the respective rubber layers, and A, B, C, . . . are cross-sectional areas of the respective rubber layers).

7. A vibration absorbing hose as set forth in claim 4, further comprising a reinforcing layer provided between each adjacent pair of rubber layers.