Patent ID: 11920653
Assignee: CARAUSTAR INDUSTRIAL AND CONSUMER PRODUCTS GROUP, INC.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 24:
25. An NVH-reducing driveshaft damper, comprising:
a helically-wound tubular core having an outer diameter D and formed from a plurality of plies, the outermost ply helically wound at a winding angle θw; and
one or more helically-wound, unitary polymeric attenuation strips mounted to the tubular core at a pitch angle θ and a pitch length L, the one or more helically-wound, unitary polymeric attenuation strips comprising a plurality of elongate protrusions;
wherein the one or more helically-wound, unitary polymeric attenuation strips comprise two or more attenuation strips each having at least two elongate protrusions having respective heights within a 5 percent variation from one another; and
wherein the one or more helically-wound, unitary polymeric attenuation strips yield (i) an effective pitch length Le, (ii) an effective pitch angle θe that exceeds both the winding angle θw and the pitch angle θ by at least 10 degrees, and (iii) an effective pitch ratio Pe of at least 1.75, wherein:, effective
       ⁢
          
       pitch
       ⁢
          
       length
       ⁢
       
         
          
       
       ⁢
       
        L
        e
       
      
      =
      
       
        pitch
        ⁢
           
        length
        ⁢
           
        L
       
       
        number
        ⁢
           
        of
        ⁢
           
        elongate
        ⁢
           
        protrusions
        ⁢
           
        in
        ⁢
           
        damper
       
      
     
     ;
    
   
  
  
   
    
     
      
       effective
       ⁢
          
       pitch
       ⁢
          
       angle
       ⁢
          
       
        θ
        e
       
      
      =
      
       arctan
       ⁡
       (
       
        
         π
         ⁢
         D
        
        
         L
         e
        
       
       )
      
     
     ;
        
     and
    
   
  
  
   
    
     
      effective
      ⁢
         
      pitch
      ⁢
         
      ratio
      ⁢
         
      
       P
       e
      
     
     =
     
      
       
        core
        ⁢
           
        diameter
        ⁢
        
           
          
        
        ⁢
        D
       
       
        effective
        ⁢
           
        pitch
        ⁢
           
        length
        ⁢
        
          
           
        
        ⁢
        
         L
         e
        
       
      
      .