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    • 2. 发明授权
    • Directly actuated injection valve
    • 直接致动的注射阀
    • US06298829B1
    • 2001-10-09
    • US09522130
    • 2000-03-09
    • Alan B. WelchIrawan RahardjaMike Hebbes
    • Alan B. WelchIrawan RahardjaMike Hebbes
    • F02M4100
    • F02M61/167F02B2275/14F02D19/024F02D41/20F02D41/2096F02D2041/2037F02M21/0254F02M21/0263F02M51/005F02M51/0607F02M61/08F02M61/10F02M61/166F02M2200/30F02M2200/304F02M2200/507Y02T10/123Y02T10/32
    • A directly actuated injection valve comprises a hollow valve housing, a valve needle disposed within the hollow interior, a needle spring, an actuator assembly, and a hydraulic link assembly. The valve needle is movable between a closed position and an open position for governing the flow of fuel into the combustion chamber of an internal combustion engine. The displacement of the valve needle from the closed position is defined as the lift. The a needle spring biases the valve needle in the closed position. The actuator assembly generates an opening force that acts against the needle spring to open the valve. The hydraulic link assembly is interposed between the valve needle and the needle spring and the actuator assembly. The hydraulic link assembly transmits respective closing and opening forces to the valve needle. The hydraulic link preferably comprises a piston disposed within a cylinder that is filled with a hydraulic fluid. The opening and closing forces are transmitted through a thickness of the hydraulic fluid that is trapped between the planar surfaces of the piston and the head and base of the hydraulic cylinder. In the preferred embodiment, the thickness of the hydraulic fluid trapped between the piston and cylinder head or base is automatically adjustable in response to changes in the dimensional relationship between components of the injection valve to maintain a desired valve needle lift when the actuator assembly is activated. When the actuator assembly comprises a magnetostrictive or piezoelectric member, the movements of the valve needle can be controlled by the application of a shaped control pulse or waveform to improve the speed of the opening and closing motion of the valve needle, and to reduce the impact of the valve needle on the valve seat upon closing.
    • 直接致动的喷射阀包括中空阀壳体,设置在中空内部内的阀针,针弹簧,致动器组件和液压连杆组件。 阀针可在关闭位置和打开位置之间移动,用于控制进入内燃机燃烧室的燃料流。 阀针从关闭位置的位移被定义为电梯。 针弹簧将阀针偏压在关闭位置。 致动器组件产生作用于针簧的打开力以打开阀。 液压连杆组件介于阀针与针簧和致动器组件之间。 液压连杆组件将相应的关闭和打开力传递到阀针。 液压连杆优选地包括设置在充满液压流体的气缸内的活塞。 打开和关闭力通过被夹在活塞的平面和液压缸的头部和底部之间的液压流体的厚度传递。 在优选实施例中,捕获在活塞和气缸盖或底座之间的液压流体的厚度可以响应于喷射阀的部件之间的尺寸关系的变化自动调节,以在致动器组件被激活时保持期望的阀针升程 。 当致动器组件包括磁致伸缩或压电构件时,可以通过施加成形的控制脉冲或波形来控制阀针的移动,以提高阀针的打开和关闭运动的速度,并且减少冲击 关闭阀座上的阀针。