Patent ID: 6748847
Filing Date: 2004-06-15
Classification: B60T

Abstract:
A brake booster comprising a valve body slidably disposed within a housing, a power piston mounted on the valve body to partition the interior of the housing into a constant pressure chamber and a variable pressure chamber, a valve mechanism disposed within the valve body to supply a fluid to or to displace it from the variable pressure chamber, an input shaft to operate the valve mechanism, and a solenoid for driving a solenoid plunger which is slidably mounted on the valve body reciprocatively to operate the valve mechanism, the valve mechanism including at least first valve means disposed within the valve body and second valve means mounted on the input shaft;further comprising a valve member slidably mounted in the valve body and defining the first valve means such that the energization of the solenoid causes the valve member to move relative to the valve body in linked relationship with the solenoid plunger to operate the valve mechanism, a core member forming part of a magnetic path for the solenoid being positioned so as to oppose the direction in which the solenoid plunger is operated and so as to be movable relative to the valve body, the core member being arranged such that it can be linked to the input shaft.