公开(公告)号：WO1996032585A1

公开(公告)日：1996-10-17

申请号：PCT/US1996003434

申请日：1996-03-14

Applicant: CATERPILLAR INC.

Inventor： CATERPILLAR INC. ,  CAMPLIN, Fred, A. ,  FLINN, Michael, A. ,  ZUO, Lianghe

IPC: F02M45/00

CPC classification number: F02M57/026 ,  F02M45/00 ,  F02M57/025 ,  F02M59/08 ,  F02M59/105 ,  F02M63/02

Abstract: A multipiece fuel pump plunger assembly for controlling the fuel injection rate and delivery during the initial injection portion of a fuel injection cycle for an internal combustion engine. The injector (2) includes a two piece plunger assembly including a plunger (60) and a plunger sleeve (58). The plunger (60) having a small predetermined diameter and being slidably positioned within a plunger sleeve (58) having a diameter greater than the diameter of the plunger (60). The multipiece plunger (60) is advantageous because it allows for shaping of the rate of fuel injected into the combustion process thereby reducing the excess fuel flow in the early portion of the injection cycle. Elimination of the excess fuel flow results in lower oxides of nitrogen and particulate exhaust emission levels and less engine noise.

Abstract translation: 一种用于在内燃机的燃料喷射循环的初始喷射部分期间控制燃料喷射速率和输送的多功能燃料泵柱塞组件。 注射器（2）包括一个包括柱塞（60）和柱塞套筒（58）的两件式柱塞组件。 柱塞（60）具有小的预定直径并且可滑动地定位在具有大于柱塞（60）的直径的直径的柱塞套筒（58）内。 多片柱塞（60）是有利的，因为它允许成形喷射到燃烧过程中的燃料的速率，从而减少喷射循环的早期部分中的过量燃料流量。 消除过多的燃料流量导致氮的较低氧化物和排放废气排放水平和较少的发动机噪音。