发明名称 |
Hydraulically actuated fuel injector with injection rate shaping pressure intensifier |
摘要 |
Fuel injection rate shaping is integrated into the pressure intensification stage of a hydraulically actuated fuel injector having a pressure intensifier. In a first embodiment, the pressure intensification plunger is formed of two parts creating a damping chamber therebetween from which fluid is forced out through orifices in a lower one of the plunger parts during an initial phase of displacement of the upper part. Thus, injection will be performed initially at a lower pressure and rate, which increases once the plunger parts make contact. In a second embodiment, a throttled flow is set via a restrictor housing that telescopingly receives the upper plunger part, so that a lower injection rate occurs while fluid is bled off through a restricted flow path between the restrictor housing and the upper plunger part, and a higher injection rate is produced once a port in the upper plunger clears the restrictor housing. In a third embodiment, the two plunger parts of the intensifier have different areas relative to each other. In a fourth embodiment, flow to the intensifier plunger is varied by the intensifier plunger co-acting with a shaped inlet port increasing the effective area of the inlet port through which flow enters the intensifier as the intensifier plunger is displaced during its injection stroke. In a fifth embodiment, a throttling effect produced by a clearance between a protrusion on the intensifier plunger and a receiving bore in the intensifier body is used reduce the intensification effect during the initial phase of injection.
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申请公布号 |
US5894992(A) |
申请公布日期 |
1999.04.20 |
申请号 |
US19960682966 |
申请日期 |
1996.07.18 |
申请人 |
CUMMINS ENGINE COMPANY, INC. |
发明人 |
LIU, CHUNG Y.;GHUMAN, AMARJIT S.;YEN, BENJAMIN M.;PETERS, LESTER L.;SMITH, EDWARD D. |
分类号 |
F02M45/00;F02M45/06;F02M57/02;F02M59/10;(IPC1-7):F02M47/02 |
主分类号 |
F02M45/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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