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1. 发明专利

JPH1061528A FLUID SEAL IN RELATION TO PERIODIC HIGH PRESSURE IN FUEL INJECTOR 失效
公开(公告)号：JPH1061528A
公开(公告)日：1998-03-03
申请号：JP12673797
申请日：1997-05-16
申请人： CATERPILLAR INC
发明人： STOCKNER ALAN R , TOMASESKI JAY E , WIEMKEN NORVAL J
IPC分类号： F02M57/02 , F02M59/44 , F02M61/16 , F16J15/00
摘要： PROBLEM TO BE SOLVED: To damp pressure applied on an O-ring generated when a plunger is moved toward an advance position by arranging an accumulating capacity between the end part of the pressure surface of the plunger and the O-ring, or a pressure release passage opened to a plunger bore on the lower side of the O-ring. SOLUTION: An injector main body 211 is provided with a plunger bore 12 and a fuel pressurizing chamber 17. One end opened to the plunger bore 12 and the other end opened to a low pressure fuel return passage are formed on a pressure release passage 219. The plunger 120 is provided with an O-ring seal 24 and an annular accumulating capacity 125. The pressure release passage 219 is arranged on the lower side of the O-ring 24, the accumulating capacity 125 are arranged between the pressure release passage 219 and the O-ring 24. When the plunger 120 is moved downward, pressure applied on the O-ring 24 is damped by a part of pressure leaked from the pressure release passage 219 and remaining pressure which is increased in the accumulating capacity 125.

2. 发明专利

DE69736964D1 未知
公开(公告)号：DE69736964D1
公开(公告)日：2007-01-04
申请号：DE69736964
申请日：1997-04-07
申请人： CATERPILLAR INC
发明人： STOCKNER ALAN R , TOMASESKI JAY E , WIEMKEN NORVAL J
IPC分类号： F02M59/44 , F02M57/02 , F02M61/16 , F16J15/00
摘要： A fuel injector includes an injector body (211) with a plunger bore (12) that opens to a nozzle outlet. A plunger (120) having a pressure face and a side surface is positioned to reciprocate in the plunger bore (12) between an advanced position and a retracted position. A portion of the plunger bore (12) and the plunger (120) define a fuel pressurization chamber (17) that opens to the nozzle outlet. A needle valve is positioned in the injector body (211) adjacent the nozzle outlet and is moveable between an open position which opens the nozzle outlet and a closed position in which the nozzle outlet is closed to the fuel pressurization chamber (17). An O-ring (24) is in contact with the side surface of the plunger (120) and the plunger bore (12) on the injector body (211) and serves to seal against fuel leakage past the plunger (120). Pressure acting on the O-ring (24) is attenuated by providing either a pressure accumulation volume (125) between the pressure face end (22) of the plunger (120) and the O-ring (24) and/or a pressure release passage (219) that opens the plunger bore (12) to a low pressure return line below the O-ring (24).

3. 发明专利

DE10256443A1 未知
公开(公告)号：DE10256443A1
公开(公告)日：2003-07-10
申请号：DE10256443
申请日：2002-12-03
申请人： CATERPILLAR INC
发明人： ANGELINO JOSEPH , BATES CHARLES E , BUCKMAN COLBY , COTTON III CLIFFORD E , SHAFER SCOTT F , STOCKNER ALAN R , TOMASESKI JAY E
IPC分类号： F02B1/12 , F02B3/06 , F02B37/00 , F02M45/08 , F02M57/02 , F02M61/18 , F02M45/12 , F02M47/06 , F02M43/04
摘要： A nozzle insert that is capable of being irreversibly attached to a needle valve tube such that the resulting needle valve member can be used in a nested needle valve configuration for a dual mode fuel injector.

4. 发明专利

DE69736964T2 未知
公开(公告)号：DE69736964T2
公开(公告)日：2007-09-13
申请号：DE69736964
申请日：1997-04-07
申请人： CATERPILLAR INC
发明人： STOCKNER ALAN R , TOMASESKI JAY E , WIEMKEN NORVAL J
IPC分类号： F02M59/44 , F02M57/02 , F02M61/16 , F16J15/00
摘要： A fuel injector includes an injector body (211) with a plunger bore (12) that opens to a nozzle outlet. A plunger (120) having a pressure face and a side surface is positioned to reciprocate in the plunger bore (12) between an advanced position and a retracted position. A portion of the plunger bore (12) and the plunger (120) define a fuel pressurization chamber (17) that opens to the nozzle outlet. A needle valve is positioned in the injector body (211) adjacent the nozzle outlet and is moveable between an open position which opens the nozzle outlet and a closed position in which the nozzle outlet is closed to the fuel pressurization chamber (17). An O-ring (24) is in contact with the side surface of the plunger (120) and the plunger bore (12) on the injector body (211) and serves to seal against fuel leakage past the plunger (120). Pressure acting on the O-ring (24) is attenuated by providing either a pressure accumulation volume (125) between the pressure face end (22) of the plunger (120) and the O-ring (24) and/or a pressure release passage (219) that opens the plunger bore (12) to a low pressure return line below the O-ring (24).

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