Patent ID: 11946510
Assignee: MUHR UND BENDER KG
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  H | IPC F

Claim 14:
15. A shaft assembly, comprising:
a hollow shaft with an axis of rotation; and
a hub body which is connected to the hollow shaft in a force locking manner;
wherein the hollow shaft, viewed in cross-section, includes a circumferentially closed wall with a plurality of circumferentially distributed support portions that are in abutting contact with the hub body, and with spring portions spaced from an inner circumferential face of the hub body;
wherein inner surface regions of the spring portions lie on a smaller radius around the axis of rotation than inner surface regions of the support portions; and
wherein the hollow shaft is configured so as to have a spring rate for which the following applies:, k
    ⁢
    3
  
  =
  
    
      
        F
        rad
      
      
        U
        
          3
          ⁢
          4
        
      
    
    <
    
      π
      *
      
        l
        
          3
          ⁢
          4
        
      
      *
      E
      *
      
        
          (
          
            1
            -
            
              
                π
                *
                
                  D
                  
                    3
                    ⁢
                    a
                  
                  2
                
              
              
                2
                *
                A
              
            
            -
            μ
          
          )
        
        
          -
          1
        
      
    
  

wherein:
k3 is the spring rate,
Frad are effective radial forces between the shaft and the hub body in an assembled condition,
U34 is an effective interference between a largest outside diameter of the shaft and a smallest inner diameter of the hub body in an unmounted condition,
E is a modulus of elasticity of the shaft,
l34 is a length of a mating surface between the shaft and the hub body,
D3a is twice a maximum radius of the shaft in the unmounted condition,
A is a cross-sectional area of the shaft, and
μ is a transverse contraction coefficient of the shaft.