Patent ID: 8074557

Claim:
An electrohydraulic booster comprising an electromechanical transducer ( 2 ; 102 ) and a hydromechanical power stage ( 10 ; 110 ), which is connected to a pressurized-fluid supply ( 13 ; 113 ) and is provided with a cylinder ( 8 ; 108 ) and a piston ( 9 ; 109 ) that can be displaced therein along a working axis ( 5 ; 105 ), wherein the electromechanical transducer acts on a spool valve ( 23 ; 123 ), which is associated with the hydromechanical power stage, is disposed at least partly in the interior of the piston ( 9 ; 109 ) and is guided displaceably along the working axis in a guide bore, and which is provided with two first leading edges ( 38 a , 38 b ; 138 a , 138 b ) that cooperate with corresponding second leading edges ( 39 a , 39 b ; 139 a , 139 b ) provided on the guide bore to form a hydraulic sequential control, wherein the guide bore is constructed in two parts, with a first portion ( 25 ; 125 ) joined rigidly to the cylinder and a second portion ( 27 ; 127 ) whose position can be varied along the working axis ( 5 ; 105 ) and which is provided with the second leading edges ( 39 a , 39 b ; 139 a , 139 b ), wherein the first portion ( 25 ; 125 ) of the guide bore is constructed in a guide sleeve ( 29 ; 129 ) inserted in the cylinder ( 8 ; 108 ).