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    • 7. 发明授权
    • Unit injector
    • 单元喷油器
    • US4976245A
    • 1990-12-11
    • US405882
    • 1989-09-11
    • Takeshi TakahashiToshiro Itatsu
    • Takeshi TakahashiToshiro Itatsu
    • F02M57/02F02M59/36F02M59/46F02M63/00H01L41/053
    • F02M59/468F02M57/02F02M59/366H01L41/053H01L41/0536
    • A unit injector comprising a plunger, a high pressure fuel chamber defined by the tip face of plunger, and a fuel supply port open to the high pressure fuel chamber when the plunger is at the fuel compressing operation start position. A variable volume chamber filled with fuel is provided, and the volume of the variable volume chamber is controlled by a piezoelectric element. A spill valve is also provided for spilling out the fuel in the high pressure fuel chamber to stop the fuel injection, and is controlled by the fuel pressure in the variable volume chamber. A fuel charging port connected to the variable volume chamber is open to the plunger bore at a position remote from the tip face of the plunger on a side opposite to the high pressure fuel chamber, and the variable volume chamber is charged with fuel via the fuel charging port. A fuel trapping chamber is formed between the plunger and the plunger bore at a position between the fuel supply port and the fuel charging port to trap fuel leaked from the high pressure fuel chamber.
    • 一种单元喷射器,包括柱塞,由柱塞的顶面限定的高压燃料室,以及当柱塞处于燃料压缩操作开始位置时通向高压燃料室的燃料供给口。 提供了充满燃料的可变容积室,并且可变容积室的体积由压电元件控制。 还提供溢流阀,用于在高压燃料室中溢出燃料以停止燃料喷射,并且由可变容积室中的燃料压力控制。 连接到可变容积室的燃料加注口在与高压燃料室相对的一侧远离柱塞的顶面的位置处对柱塞孔开放,并且可变容积室经由燃料加入燃料 充电口。 在燃料供给口和燃料加注口之间的位置处,在柱塞和柱塞孔之间形成燃料捕集室,以捕获从高压燃料室泄漏的燃料。