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1 有一錐形離合器,半錐角為12.5°,錐面寬10cm,平均直徑50cm,μ=0.2,錐面允許之工作應力為0.2MPa,則此離合器在起動時,所需之軸向推力大約為何?(sin12.5°=0.2164,cos12.5°=0.9762)
A 6800N
B 8170N
C 10750N
D 12925N

α=12.5° b=10cm=100mm Dm=50cm=500mm μ=0.2 P=0.2MPa

Fn=P×πDmb

=0.2×3.14×500×100=31400(N)

起動時所需之軸向推力為 F =Fn(sinα+μcosα)

=31400(0.2164+0.2×0.9762)=12925.5(N)