Abstract:
A fuel system for an engine is disclosed. The fuel system has a first source configured to pressurized fuel to a first pressure, and a second source configured to pressurized fuel to a second pressure. The fuel system also has a fuel injector (32) configured to receive and inject fuel into the engine, and a single valve (102) disposed between the fuel injector and the first and second sources. The single valve is in fluid communication with the first and second sources and the fuel injector, and able to deliver variable pressure fuel to the fuel injector.
Abstract:
A metallic fuel system component (14, 50) includes an internal surface (52, 90) and an external surface (54, 92). The metallic fuel system component (14, 50) is made by inducing compressive residual stress in only a portion of the internal surface (52, 90) of the metallic fuel system (10) component by transmitting a laser shock wave (146) through the metallic fuel system (10) component from the external surface (54, 92) to the internal surface (52, 90).
Abstract:
A method of making a piezoelectrically actuated device (82) includes the steps of compressing a piezoelectric element (30) toward a compression state which is based on a target preload for the piezoelectric element (30), and elastically deforming a casing (40) for the piezoelectric element (30) toward a spring state which is also based on the target preload for the piezoelectric element (30). The method further includes plastically deforming the casing (40) about the subassembly (12) when the piezoelectric element (30) and the casing (40) are at their respective compression state and spring state to set a preload of the piezoelectric element (30) at the target preload.
Abstract:
An actuator (59) for a fuel injector (32) is disclosed. The actuator has a piezo element (110), a casing (114), and at least one end plate (116). The casing is fabricated through a deep draw process, has bellows (126), and is configured to house the piezo element. The at least one end plate is hermetically connected to an end portion (124) of the casing.
Abstract:
A control system for a fuel injector (32) is disclosed. The control system has a nozzle member (56) with at least one orifice (80), and a needle check valve (58). The needle check valve (58) is recipratingly disposed to open and close the at least one orifice (80). The control system also has a control chamber (106) located at the base end of the needle check valve (58), and a control valve (120) movable to selectively drain and fill the control chamber (106). The control system further has an injector body (52), a first piston (118) located within the injector body (52), and a second piston (116) located within the injector body (52). The first piston (118) is operatively connected to the control valve (120) to move the control valve (120). The second piston (116) is located a distance from the first piston (118) to form a coupling chamber (123). The control system additionally has a partial-ball check valve (119) associated with the coupling chamber to selectively replenish the coupling chamber (123).
Abstract:
A fuel injector (32) for a work machine (5) is disclosed. The fuel injector has nozzle member (56) having at least one orifice (84) and a needle valve element (58) having a tip end (86). The needle valve element is axially movable to selectively allow and block fuel flow through the at least one orifice with the tip end. The fuel injector also has at least one supply passageway (50) in communication with the tip end of the needle valve and a variable restrictive device (106) disposed within the at least one supply passageway.
Abstract:
An internal combustion engine (12) includes an engine housing (16), a common rail (14), and a pressurization device (40) for the common rail fuel system (14) which includes a plurality of intensifier pistons (51, 53), and an hydraulically actuated control valve (60) movable between a first position at which it fluidly connects a source of pressurized actuation fluid (32) with one of said intensifier pistons (51) but not a second one of the intensifier pistons (53), and a second position at which it fluidly connects the at least one fluid inlet with the second one of the intensifier pistons (53) but not the first one (51) of the intensifier pistons (51).
Abstract:
A fuel system (12) for an engine (10) is disclosed. The fuel system includes a common rail (34), and a cylinder head (20) having a first bore (46) and a second bore (52) intersecting the first bore. A fuel injector (32) is coupled to the cylinder head and at least partially received within the first bore. The fuel system also includes a one-piece hollow tube (48), extending linearly from the common rail to the fuel injector through the second bore. The one-piece hollow tube is configured to communicate high pressure fuel from the common rail to the fuel injector.
Abstract:
A fuel injector (32) for a machine (10) is disclosed. The fuel injector has a nozzle member (56) with a first end (64) and a second end. The first end of the fuel injector has at least one orifice (80). The fuel injector also has a control chamber (71) located toward the second end of the nozzle member with an end wall portion (116) approximately orthogonal to an axial direction of the nozzle member. The fuel injector further has a port (78) disposed in the end wall portion of the control chamber and at least one passageway (77) in fluid communication with the control chamber via the port. The fuel injector additionally has a needle valve element (58) with a tip end (82) and a base end (110). The tip end is configured to selectively block fuel flow through the at least one orifice. The base end has a recess (112) configured to cap off the port.
Abstract:
A fuel injector (32) is provided having a needle valve element (46) and a nozzle member (44) with a central bore (70) configured to slidingly receive the needle valve element. The fuel injector (32) also has a spring (84) configured to bias the needle valve element (46) toward a closed position. In addition, the fuel injection assembly has a guide element (76) configured to reduce a lateral movement of the needle valve element (46). The fuel injection assembly further has a fluid flow restricting device (78) configured to restrict the flow of a fluid through the needle valve element (46) and create a fluid pressure differential between the fluid upstream and downstream of the fluid flow restricting device (78).