US2015182824A1PendingUtilityA1

Shaft made of fiber-reinforced composite material

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Assignee: JX NIPPON OIL & ENERGY CORPPriority: Dec 27, 2013Filed: Dec 18, 2014Published: Jul 2, 2015
Est. expiryDec 27, 2033(~7.4 yrs left)· nominal 20-yr term from priority
Inventors:Shinichi Takemura
A63B 60/00A63B 2225/02A63B 60/08A63B 53/10A63B 2209/023
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Claims

Abstract

Provided is a shaft made of a fiber-reinforced composite material including: a straight layer having a reinforcement fiber oriented in an axial direction; a first reinforcing layer provided outside the straight layer and having a first carbon fiber; and a second reinforcing layer provided outside the first reinforcing layer and having a second carbon fiber, wherein a tensile elastic modulus of the first carbon fiber and a tensile elastic modulus of the second carbon fiber are different from each other and are smaller than that of the reinforcing fiber in the straight layer.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A shaft made of a fiber-reinforced composite material, comprising:
 a straight layer having a reinforcement fiber oriented in an axial direction;   a first reinforcing layer provided outside the straight layer and having a first carbon fiber; and   a second reinforcing layer provided outside the first reinforcing layer and having a second carbon fiber,   wherein a tensile elastic modulus of the first carbon fiber and a tensile elastic modulus of the second carbon fiber are different from each other and are smaller than that of the reinforcing fiber in the straight layer.   
     
     
         2 . The shaft made of the fiber-reinforced composite material according to  claim 1 , wherein the tensile elastic modulus of the second carbon fiber is smaller than that of the first carbon fiber. 
     
     
         3 . The shaft made of the fiber-reinforced composite material according to  claim 1 , wherein the tensile elastic modulus of the first carbon fiber and the tensile elastic modulus of the second carbon fiber are 10 to 200 GPa. 
     
     
         4 . The shaft made of the fiber-reinforced composite material according to  claim 2 , wherein the tensile elastic modulus of the first carbon fiber and the tensile elastic modulus of the second carbon fiber are 10 to 200 GPa.

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