Radius of gear cylinder, r1 (mm) | Radius of rubber layer, r2 (mm) | Radius of middle steel plate, R (mm) | Thickness of upper and lower steel plate, hs1 (mm) | Thickness of middle steel plate, hs2 (mm) | Thickness of rubber layer, hr (mm) | Distance between lead core and central axis, a1 (mm) | Diameter of lead core, Φ (mm) | Shear modulus of rubber, Gr (MPa) |