Vacuum brake booster with magnet-free emergency breaking assistance system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 6, 2003
Issued Date -
N/A
app pub date -
May 1, 2001
filing date -
Nov 2, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vacuum brake booster comprising a vacuum chamber (16) and a working chamber (18), separated by a movable wall (14) coupled to a housing (22). A control valve (20) includes a first valve seat (40) formed on a displacement valve member (38) and cooperating with a first valve seat member (42), to control a supply of atmospheric pressure to the working chamber. A rear side of the valve member is constantly subjected to pressure in the working chamber. When the valve member is displaced more than a predetermined distance in the actuating direction relative to the housing, a front side of the valve member is subjected to pressure in the vacuum chamber, such that a differential pressure acts on the valve member, to hold the valve member in a displaced position until pressure equalization between the first and rear sides of the valve member is effected.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully