摘要:
A common rail single fluid injection system including fuel injectors with the ability to produce multiple injection rate shapes. This is accomplished by including auxiliary filling orifices which selectively provide pressurized fluid to the check needle control chamber during injection events. In so doing, the speed and movement of the check needle is manipulated and differing injection rates may be achieved.
摘要:
A common rail single fluid injection system including fuel injectors with the ability to produce multiple injection rate shapes. This is accomplished by including auxiliary filling orifices which selectively provide pressurized fluid to the check needle control chamber during injection events. In so doing, the speed and movement of the check needle is manipulated and differing injection rates may be achieved.
摘要:
A common rail fuel pump includes a cam shaft with at least one cam rotatably supported in a pump housing. A plurality of tappet assemblies are each reciprocatingly movable in the pump housing, and include an axle pin mounted in a tappet, and a roller mounted in contact for rotation about the axle pin. Each end of the roller includes a plurality of non-contiguous planar thrust surfaces separated by lubrication grooves. A lubrication pathway for the roller includes in sequence a lubrication passage that opens to a roller bearing surface, movement along the roller bearing surface into the lubrication grooves, and then between the planar thrust surface of the roller and a counterpart thrust face of the tappet responsive to rotation of the roller on the cam shaft.
摘要:
The present disclosure is directed to a fuel injector. The fuel injector may include a casing substantially aligned along a central axis of the fuel injector. The fuel injector may also include a control valve configured to control a flow of fuel through the fuel injector. The fuel injector may also include a piezoelectric element disposed within the casing and associated with the control valve. The fuel injector may further include a motion coupler disposed between the control valve and the piezoelectric element the motion coupler configured to affect shock to reduce microscopic fractures within the piezoelectric element.
摘要:
The present disclosure is directed to a fuel injector. The fuel injector may include a casing substantially aligned along a central axis of the fuel injector. The fuel injector may also include a control valve configured to control a flow of fuel through the fuel injector. The fuel injector may also include a piezoelectric element disposed within the casing and associated with the control valve. The fuel injector may further include a motion coupler disposed between the control valve and the piezoelectric element the motion coupler configured to affect shock to reduce microscopic fractures within the piezoelectric element.
摘要:
A valve assembly is disclosed. The valve assembly has a housing having a first recess disposed on an interior surface of the housing and at least one valve-supporting element disposed within the housing. The valve assembly also has a washer disposed within the housing, the washer having a first washer surface and a projection for transferring torque. The first washer surface abuts against a first valve-supporting element surface of the at least one valve-supporting element and the projection is received in the first recess. The valve assembly also has a first fastener disposed within the housing and having a first fastener surface abutting against a second washer surface of the washer.
摘要:
Particularly in the fuel injector art, two components may define a high pressure space that is sealed against leakage via a planar sealing land between the two components. If a leak develops in the planar contact area between the two components, it can act to wedge the two components apart, which tends to exacerbate the leakage problem, and so on. Since some leakage between the two components is almost inevitable for a variety of reasons known in the art, a strategy that arrests the leak before it can produce the component separating wedge affect would be beneficial. This can be accomplished by positioning a leak arrest volume, which may be vented, around a majority of the perimeter of the high pressure space. The usage of a leak arrest volume finds particular application in fuel injectors, especially a class of common rail fuel injectors that are maintained at high pressure during prolonged periods between injection events.
摘要:
A fuel pump and method for draining such and for providing a lubrication fluid sump level for startup of the fuel pump are disclosed. The fuel pump may comprise a housing, a first plunger apparatus, and a camshaft rotatably mounted in the housing. The camshaft has a first end and a second end and may define a bore extending from the first end to the second end. The camshaft may include a first interface operatively connected to the first plunger apparatus.
摘要:
A fuel pump and method for draining such and for providing a lubrication fluid sump level for startup of the fuel pump are disclosed. The fuel pump may comprise a housing, a first plunger apparatus, and a camshaft rotatably mounted in the housing. The camshaft has a first end and a second end and may define a bore extending from the first end to the second end. The camshaft may include a first interface operatively connected to the first plunger apparatus.
摘要:
A common rail fuel pump includes a cam shaft with at least one cam rotatably supported in a pump housing. A plurality of tappet assemblies are each reciprocatingly movable in the pump housing, and include an axle pin mounted in a tappet, and a roller mounted in contact for rotation about the axle pin. Each end of the roller includes a plurality of non-contiguous planar thrust surfaces separated by lubrication grooves. A lubrication pathway for the roller includes in sequence a lubrication passage that opens to a roller bearing surface, movement along the roller bearing surface into the lubrication grooves, and then between the planar thrust surface of the roller and a counterpart thrust face of the tappet responsive to rotation of the roller on the cam shaft.