844 Hydraulics Course Notes — Page 68

66 FUNCTIONING OF POWER ASSISTANCE Chamber 1 Te, SACRO SLSPR LRA BZLL Nate pi pr | AA SPPAL Ne Overflow return Piston Overflow return a) Hydraulic rack control ( cylinder ) Description : The rack is joined up to the piston of the hydraulic rack control (cylinder ) L.et S be the surface of the piston in chamber 1 and S/2 its surface ( by construction ) in chamber 2. * Functioning : . The steering balance is obtained when the forces F and Fl which act .on each face of the piston are equal : Let: F=S x HP = Fl =S/2 x HP 2