On the Mechanical Friction Losses Occurring in Automotive Differential Gearboxes

Figure 12

Example of a load parameter Δ𝜔/𝜔_rg with a complex path depending on time 𝑡∈[0,1000s]: when Δ𝜔/𝜔_rg=0 (in the case where 𝜔_lw≠0 and 𝜔_rw≠0) then 𝜂_di=1 and 𝑙_𝑖=𝑃_𝑖/𝑃_rg=0, ∀𝑖 (when the vehicle was travelling along a straight line), when 0<Δ𝜔/𝜔_rg<2 then 𝜂_di<1 and 𝑙_𝑖=𝑃_𝑖/𝑃_rg>0, ∀𝑖 (when the vehicle was taking a curvilinear course), when Δ𝜔/𝜔_rg=2 then 𝜂_di<1 and 𝑙_𝑖=𝑃_𝑖/𝑃_rg>0, ∀𝑖 (when one of the driven wheels underwent slipping, the vehicle was stationary); on the plateau, Δ𝜔/𝜔_rg=constant and |𝜔_lw−𝜔_rw|=constant (the vehicle was taking a constant curvilinear trajectory).