Fuel injection valve for internal combustion engines
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United States of America Patent
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Feb 7, 2006
Grant Date -
Apr 7, 2005
app pub date -
Aug 18, 2004
filing date -
Feb 22, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fuel injection valve for an internal combustion engine which includes an axially moveable needle-like injection valve member 10 mounted in a tubular housing 2. A control element 22 with a control passage 25 is mounted in the upper end portion of the housing, and a valve element 21, 41, 46 is mounted for movement below the control element. A control chamber 20 is formed below the valve element, and a control piston 18 which is formed at the upper end of the valve member 10 bounds the lower side of the control chamber. A throttle passage 26, 42, 47 in the valve element is connected via a throttle constriction between the control passage 25 in the control element 22 and the control chamber 20. A throttle inlet 33, which is formed in the valve element 21 or in a sleeve 19 which laterally bounds the control chamber, is connected between a high pressure chamber 9 in the housing and the control chamber 20 without passage through an intermediate throttle point. The pressure in the control chamber 20 is thus always higher than the pressure in the control passage 25.
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