Patent ID: 6216580
Filing Date: 2001-04-17
Classification: B60T

Abstract:
In a booster including a valve body slidably disposed within a shell, a power piston integral with the valve body, a constant pressure chamber and a variable pressure chamber defined adjacent opposite sides of the power piston, a valve mechanism disposed in the valve body, an input shaft connected to an operating rod for driving a valve plunger, which forms the valve mechanism, back and forth to switch a flow path in the valve mechanism, and an output shaft having a recess formed in a rear portion thereof and fitted on the valve body so that it is driven forward as the valve body is driven forward;a reaction mechanism for the booster comprising a pseudo-reaction imparting means which prevents a reaction applied to the output shaft from being transmitted to the valve plunger when the booster is operative and which imparts a pseudo-reaction which depends on a travel of the input shaft,the pseudo-reaction imparting means comprising a tubular member secured to the shell, and an elastic member disposed between the tubular member and the input shaft.