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    • 3. 发明授权
    • Fuel injection pump
    • 燃油喷射泵
    • US5911207A
    • 1999-06-15
    • US25664
    • 1998-02-18
    • Takashi OhishiToshihumi NodaTohru YokotaNobuhiro Kitahara
    • Takashi OhishiToshihumi NodaTohru YokotaNobuhiro Kitahara
    • F02M45/02F02M45/06F02M59/10F02M59/24F02M59/26F02M59/38F02M34/00F02B3/00
    • F02M45/02F02M45/063F02M59/102F02M59/24F02M59/38
    • An objective of the present invention is to provide a fuel injection pump wherewith, in addition to main injection, pre-injection is made possible in the vicinity of top dead center in the exhaust stroke, and wherewith, by regulating the pre-stroke, defined as the stroke from bottom dead center of a plunger 2 to the commencement of fuel line pressurization, it is possible to freely control both the pre-injection volume and the pre-injection timing relative to the main injection. Attention having been given to the combining of a pre-stroke varying mechanism together with a two-stage injection mechanism, the present invention is a fuel injection pump that is made so that a pre-stroke is regulated by changing the relative positions, in the axial direction, of a plunger 2 that sends fuel under pressure and a control sleeve 3 that fits around the outside of the plunger 2 so as to slide freely thereon. The cam 4 that drives the plunger 2 comprises a main cam nose 20 for main injection use and a pre cam nose 21 for pre-injection use.
    • 本发明的目的是提供一种燃料喷射泵,除了主喷射之外,在排气冲程中的上死点附近也可以进行预喷射,并且通过调节前冲程来定义 作为从柱塞2的下止点到燃料管路加压开始的冲程,可以相对于主喷射自由地控制预喷射量和预喷射正时。 注意到将前冲程变化机构与两级喷射机构结合在一起,本发明是一种燃料喷射泵,其被制成使得通过改变相对位置来调节前冲程,在 在压力下发送燃料的柱塞2的轴向方向以及围绕柱塞2的外部配合以便在其上自由滑动的控制套筒3。 驱动柱塞2的凸轮4包括用于主要注射用途的主凸轮鼻20和用于预注射使用的预凸轮鼻21。
    • 4. 发明授权
    • Fuel injection system
    • 燃油喷射系统
    • US5443047A
    • 1995-08-22
    • US224782
    • 1994-04-08
    • Hiroshi IshiwataTakashi OhishiAtsushi UedaNaotake Ohi
    • Hiroshi IshiwataTakashi OhishiAtsushi UedaNaotake Ohi
    • F02B3/06F02D41/40F02M45/06F02M57/02F02M59/36F02M59/46F02M41/14
    • F02M45/066F02D41/403F02M57/02F02M57/023F02M59/366F02M59/466F02B3/06F02D41/402Y02T10/44
    • A solenoid valve unit is provided in the middle of fuel supply path that leads to a compression space in an injection pump main body, and the fuel injection quantity is adjusted through the open and close control of the solenoid valve unit. In this fuel injection system, the plug valve is moved until it is seated on the valve seat during the preliminary injection that is performed prior to the main injection. An arrangement for leaking the fuel from within the compression space is provided in the injection pump main body and the time period during which the fuel in the compression space is leaked via the arrangement for leaking and the time period during which the fuel supply path is restricted with the plug valve being seated on the valve seat are combined to stabilize the movement of the plug valve. Consequently, an optimal small quantity is achieved for the preliminary injection that is nearly constant regardless of the rate of rotation of the engine. Also, if a drive pulse that closes the fuel supply path over the period during which the fuel is leaked is supplied to the solenoid valve unit, the solenoid valve unit needs to be operated only once and stable injection characteristics are achieved from the pilot injection through the main injection.
    • 在燃料供给路径的中间设置有电磁阀单元,其通向喷射泵主体中的压缩空间,并且通过电磁阀单元的打开和关闭控制来调节燃料喷射量。 在该燃料喷射系统中,在主喷射之前执行的预喷射期间,旋塞阀被移动直到其被安置在阀座上。 在喷射泵主体中设置有用于从压缩空间泄漏燃料的装置,以及经由泄漏装置和压缩空间中的燃料泄漏燃料供给路径被限制的时间段 将旋塞阀置于阀座上的组合以稳定旋塞阀的运动。 因此,无论发动机的旋转速度如何,初始喷射的最佳量都是几乎恒定的。 此外,如果在燃料泄漏期间关闭燃料供给路径的驱动脉冲被供给到电磁阀单元,则电磁阀单元仅需要操作一次,并且从先导喷射通过 主要注射。