Pneumatic booster
AssigneeBendix Europe Services Techniques
InventorsJean-Pierre Gautier, Ulysse Verbo, Miguel Perez
Life of this patent
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Abstract
The invention relates to a pneumatic brake-booster comprising a casing (10), inside which is situated a movable wall (12, 14) returned to a rear position of rest by a resilient mechanism and defining a front chamber (16) permanently connected to a vacuum source (61) and a rear chamber (18) selectively connected to the front chamber (16) or to the atmosphere by a valve mechanism (20a, 32a, 40) actuated by a control rod (34) adapted to bear, by way of a plunger (32), against one face of a reaction disk (58) fastened to a push rod (56). According to the invention, the resilient mechanism returning the movable wall (12, 14) to its rear position of rest exerts a modulable force on the movable wall (12, 14).
Claims12
A pneumatic brake-booster, comprising a casing inside which is situated a movable wall returned to a rear position of rest by resilient means and defining a front chamber connected permanently to a vacuum source and a rear chamber connected selectively to one of the front chamber and atmosphere by valve means actuated by a control rod adapted to bear by means of a plunger against one face of a reaction disk adjacent a push rod, characterized in that the resilient means returning the movable wall comprises a pneumatic spring, and the booster comprises a braking detector controlling selective connection means for connecting selectively the pneumatic spring to said vacuum source when said rear chamber is connected to atmosphere and to a pressure source supplying a pressure at least equal to atmosphere pressure when said rear chamber is connected to the front chamber.
Dependencies are inferred from the claim text.