Appeal No. 2002-2039 Page 6
Application No. 09/258,712
Sturman's invention relates to a fuel injector for an internal combustion engine.
As shown in Figure 2, the fuel injector 14 has a housing 100 that includes an end cap
102 that captures a nozzle member 104 and is attached to an upper housing 106.
Within the end cap 102 are injection housing members 108 and 110. The housing 100
may further include seals (not shown) that seal the unit.
Sturman's upper housing 106 contains a fuel passage 112 that is in fluid
communication with an intensifier chamber 114 and pressure chambers 54 and 56 of
an intensifier 14. The intensifier chamber 114 is in fluid communication with a second
fuel passage 116 that extends through the housing members 108 and 110, and the
nozzle 104. The nozzle 104 contains a plurality of openings 118 that are coupled to the
second fuel passage 116. The flow of fuel through the nozzle openings 118 is
controlled by a needle valve 120. The needle valve 120 is biased into a closed position
by nozzle springs 122 located within a nozzle spring chamber 124. The nozzle
chamber 124 is coupled to the intensifier chamber 114 through passage 126 to prevent
a hydrostatic build up of pressure in the chamber 124 that will counteract the movement
of the needle valve 120. The second fuel passage 116 is connected to an injector
chamber 128 that receives fuel from the intensifier 12. The second passage 116 has a
check valve 130 which prevents fuel from flowing back into the intensifier chamber 114.
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Last modified: November 3, 2007