Pneumatic servomotor for braking assistance including a force sensor

• Main Authors: BEYLERIAN, BRUNO, NEN, YANNICK, BERNADAT, OLIVIER, BRAHMI, OMAR
• Format: Patent
• Language: English; French; German
• Published: 10.02.2010
• Subjects: ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING ORSUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES INGENERAL; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; MEASURING; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; PERFORMING OPERATIONS; PHYSICS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; TESTING; TRANSPORTING; VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES; VEHICLES IN GENERAL; VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR

The servomotor (1) has a sealed structure (3) including a rigid envelope (11) forming a vent (19). A mobile wall (13) divides the structure into a low pressure chamber (25) and a working chamber (27). A pneumatic piston (5) has a hub (31) integrated to the wall. Input and output rods (7, 9) are coupled on both sides of the piston. A return spring (37) returns the piston to a rest position and is arranged in the chamber (25) between an inner surface (45) of the envelope and piston. A force sensor (39) e.g. strain gauge, arranged in the chamber (25) is subjected to load variations of spring.