Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1996-03-08
1997-03-11
Lopez, F. Daniel
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
F15B 910
Patent
active
056090870
ABSTRACT:
An improvement of a valve mechanism for brake booster is disclosed. According to the invention, a valve mechanism for booster comprises a first valve seat formed on a valve body, a first valve element adapted to be seated upon the first valve seat, a second valve seat formed on a rear side of a valve plunger, and a second valve element adapted to be seated upon the second valve seat. The first valve element is urged rearwardly by a first spring, whereby a rear end of the first valve element is maintained in abutment against the second valve element while maintaining a hermetic seal therebetween. The second valve element is urged toward the second valve seat by a second spring having a resilience greater than that of the first spring. The diameter of a first seat area S1 where a contact occurs between the first valve seat and the first valve element is substantially equal to the diameter of a second seat area S2 where a contact occurs between the second valve seat and the second valve element. This construction allows an increased responsive area to be secured to the negative pressure in a region radially outward of the first seat area S1, thus allowing the load with which the second spring must be compressed to be reduced by an amount corresponding to an increase in the resulting pressure differential, thus in turn allowing an input required to initiate the operation of the booster to be reduced.
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patent: 5355771 (1994-10-01), Watanabe
patent: 5373776 (1994-12-01), Uyama
Jidosha Kiki Co. Ltd.
Lopez F. Daniel
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