139results about "Stress reducing fuel injection" patented technology

Methods and systems are provided for a direct injection fuel pump. The methods and system control pressure within a compression chamber so as to improve fuel pump lubrication.

The present invention relates to a mounting structure for a direct injection fuel rail. Specifically, a mounting structure 120 for a direct injection fuel rail comprises a mount unit 124 and an injector cup 122 combined with a main pipe 110, wherein the injector cup 122 and the mount unit 124 are connected to and integrated with each other via a bridge 126, wherein the injector cup 122 is bonded to the main pipe 110, and wherein the mount unit 124 is separated from the main pipe 110. As such, concentration of stress due to displacement may be prevented, resistance against fatigue fracture may be increased, thermal deformation and additional concentration of stress may be prevented, manufacturability may be improved, and precise assembling positions may be easily ensured.

A spring retaining sleeve includes a cylinder press-fit connection surface which has a press-fit diameter and a press-fit length. To enable cost-effective production of a stable press-fit assembly, at least one end of the cylinder press-fit connection surface, an optimized insertion chamfer for long press-fit assemblies is provided with a ratio of press-fit diameter to press-fit length of greater than thirty five percent.

A fuel injector-engine component assembly includes an engine component with a stepped bore defined along an axis and having a stepped bore stop surface facing axially upward. A fuel injector extending along the axis is disposed in the stepped bore and includes a fuel injector stop surface facing axially downward and axially opposing the stepped bore stop surface. An isolation ring is disposed between the engine component and fuel injector stop surfaces for axially isolating the fuel injector from the engine component. The isolation ring includes a rigid support member for limiting the axial motion of the engine component and fuel injector stop surfaces together. The isolation ring also includes a resilient and compliant isolation member located axially between the engine component and fuel injector stop surfaces to provide acoustic and thermal isolation between the fuel injector and the engine component below a predetermined pressure of the fuel injector.

A fuel injection system, in particular for direct injection of fuel into the combustion chamber of an internal combustion engine has a plurality of fuel injectors, whose injection ends, at least, are situated in receptacle bore holes of a cylinder head. The inlet side of the fuel injectors has a connecting piece, which engages with a supply line segment. Pressurized fuel is supplied to the fuel injector via the supply line segment. The connecting piece is sealed off from the supply line segment by a gasket. The gasket has a sleeve-shaped design and has a plastically deformable shaped area, which is plastically deformed during the assembly of the supply line segment with the connecting piece, and has elastic properties while in operation.

A high volume high pressure common rail pump for a fuel system includes pairs of pump head assemblies in phase with each other but oriented in opposition to one another about a rotating cam shaft. Pump pistons in the pump head assemblies simultaneously undergo pumping strokes via a shared two lobe cam of the rotating cam shaft. The pump may include two pairs of pump head assemblies, and each head assembly may include two pump pistons. The cam shaft includes two cams sufficiently out of phase with one another that the cam shaft always has a positive torque even when the cam lobes are symmetrical. In addition, because the pumping is done simultaneously on opposite sides of the cam shaft, the forces on the cam shaft are balanced and its support bearings experience less wear and tear.

A high volume high pressure common rail pump for a fuel system includes pairs of pump head assemblies in phase with each other but oriented in opposition to one another about a rotating cam shaft. Pump pistons in the pump head assemblies simultaneously undergo pumping strokes via a shared two lobe cam of the rotating cam shaft. The pump may include two pairs of pump head assemblies, and each head assembly may include two pump pistons. The cam shaft includes two cams sufficiently out of phase with one another that the cam shaft always has a positive torque even when the cam lobes are symmetrical. In addition, because the pumping is done simultaneously on opposite sides of the cam shaft, the forces on the cam shaft are balanced and its support bearings experience less wear and tear.

The invention relates to an electronically-controlled common rail heavy oil injector which comprises an injector body, an electro-hydraulic control member and a nozzle member. In the electro-hydrauliccontrol member, a ring groove is formed in the middle of the outer side of a guide sleeve, a transverse through hole is formed in the middle of the groove to directly communicate with a middle hole of the guide sleeve, the two sides of the ring groove are provided with seal rings, and the interior of the oil injector is divided into three chambers. A control valve core guide section is provided with three ring grooves, and the second ring groove is in communication with the transverse through hole in the middle of the guide sleeve. An electromagnetic component is in contact with cooling oil,a cooling oil circuit is isolated from a fuel oil circuit by means of dynamic sealing, static sealing and drainage manners, and corroding and thermal damage of heavy oil to electronic components can be effectively prevented; and a sinking groove is formed in the middle of the top end of an orifice plate, a ball valve seat guide sleeve can be sleeved with the sinking groove of the orifice plate tobe in clearance fit with a ball valve seat, and a certain guiding ability for axial movement of the ball valve seat is achieved.

Methods and systems are provided for a direct injection fuel pump. The methods and system control pressure within a compression chamber so as to improve fuel pump lubrication.

A valve seat (16′) for a fuel injector (10) includes a main body (27) having a proximal and a distal end with at least one orifice (24) extending through the main body. A seating surface (22) is provided on the main body to receive a closure member (20) of a fuel injector such that when the closure member engages the seating surface, the at least one orifice is closed. A guide surface (36) is provided on the main body to guide movement of the closure member. An annular wall (26) extends in a cantilever manner from the main body at the distal end thereof and defines an outer peripheral portion of the valve seat. The wall is constructed and arranged to deform during welding at the wall so as to isolate effects of the welding from the seating surface and the guide surface.

To provide a steel pipe as a fuel injection pipe with high material strength, high internal pressure limit free from fatigue failure, prolonged fatigue life, and high reliability. A steel pipe as a fuel injection pipe of 500 N / mm2 or higher tensile strength comprising, by mass, C: 0.12 to 0.27%, Si: 0.05 to 0.40%, and Mn: 0.8 to 2.0%, and the balance being Fe and impurities, the contents of Ca, P, and S in the impurities being Ca: 0.001% or less, P: 0.02% or less, and S: 0.01% or less, respectively, characterized in that the maximum diameter of nonmetallic inclusions present in at least in a region extending from the inner surface of the steel pipe to a depth of 20 μm is 20 μm or less. Further, this steel pipe may contain, in place of a portion of Fe, at least one selected from among Cr: 1% or less, Mo: 1% or less, Ti: 0.04% or less, Nb: 0.04% or less, and V: 0.1% or less.

An injection nozzle (22) for mounting to a nozzle holder of a fuel injection system (1) of an internal combustion engine may comprise a sealing face (29) for providing a sealed connection to the nozzle holder, a needle guiding bore (34) for guiding a needle between a fuel injection state and a sealed state of the fuel injector. The needle guiding bore (34) may extend through the sealing face (29), being fluidly connected, at an injection side of injection nozzle (22), to an outside of the injection nozzle (22) via a plurality of nozzle spray holes (70). The needle guiding bore (34) may be widened to form a high pressure fuel chamber (36). A high pressure supply bore (38) may extend through the sealing face (29) and fluidly connect an opening in the sealing face (29) with the high pressure fuel chamber (36). A radial outer section (60) of a wall of the fuel supply channel (38) may smoothly transition into a wall of the high pressure fuel chamber (36). The high pressure supply bore (38) may be provided in a drop-like, rounded shape.

Disclosed herein is a mounting structure of a fuel rail, including a mounting boss part having a through-hole formed in a longitudinal direction and a first mating surface formed at an outer surface, an injector cup part provided separately from the mounting boss part and having a second mating surface formed at an outer surface and a flow path hole formed at one side of the second mating surface to be connected to the main pipe for transferring fuel to an injector, and a bridge part connecting the mounting boss part and the injector cup part and having a third mating surface. The mounting structure of the fuel rail can effectively distribute stress concentration by increasing contact area with the main pipe, thereby improving fatigue strength.

On an inner wall of a bag-shaped hole portion of a nozzle body, a cross angle between the bag-shaped hole portion and a needle hole or an oblique high-pressure fuel passage of the nozzle body is made obtuse, i.e. at 90 degrees or larger, through an electrochemical machining process with a suitably-shaped electrode or through after-processing with a boring tool having a predetermined shape. The center of the bag-shaped hole portion may be deviated toward the high-pressure fuel passage or the high-pressure fuel passage may be connected to a maximum diameter portion of the bag-shaped hole portion to provide the obtuse cross angle. Thus, excessive stress on the inner wall of the bag-shaped hole portion or a breakage of the nozzle body due to a crack can be inhibited.

A fuel supply device includes a fuel pump, a plurality of valves, and a controller. The fuel pump includes a plurality of pressure chambers each having a volume that is expanded and contracted by the engine. The plurality of valves open and close the pressure chambers. An expansion time and a contraction time of the pressure chambers are each different. The fuel pump is operable to sealingly store fuel in the pressure chambers by closing the valves. The controller sets closing times for the valves in accordance with a required quantity of fuel to be force fed. The controller switches between a normal control in which all of the pressure chambers sequentially force feed fuel and a thinned-out control in which the force fed fuel is thinned out by stopping closing at least one of the valves.

A fuel rail or pressure vessel assembly extends along a longitudinal axis and includes a fluid conduit having an opening at either or both of the longitudinal ends of the conduit. The conduit has an inlet coupled to a high-pressure fuel source, a plurality of outlets, and a conduit interior that forms a fluid flow passageway between inlet and outlets. An end cap assembly is mounted to cover and close each fluid conduit opening. The end cap assembly includes a cup having a free edge that defines an aperture that leads to a cup interior. The cup has an inner surface facing the conduit interior. The end cap assembly also includes a reinforcement that is mounted to the inner surface of the cup. Both the cup and the reinforcement can be stamped metal components and are brazed together.

A high-pressure pump is comprised of a lower housing, an upper housing and a cover, which are formed independently from each other. Thereby, shapes of the above can be simplified. Although the cylinder and the plunger receive a fuel pressure during a pressurization stroke, the upper housing and the cover do not receive fuel pressure directly from a pressurization chamber. Therefore, the upper housing and the cover can be made thin and light as much as possible.

A holder (3) serves for fastening a component (2), in particular a fuel distributor (2), onto an internal combustion engine (16). A holding element (9) that has a component-side connecting segment (10) is provided. The holding element (9) is connectable at the component-side connecting segment (10) to the component (2). The holding element (9) furthermore has a fastening-means-side connecting segment (11) at which the holding element (9) is fastenable via a fastening means (15) onto the internal combustion engine (16). A receiving part (12) and a fastening sleeve (13) are provided. The receiving part (12) serves to connect the fastening sleeve (13) to the fastening-means-side connecting segment (11) of the holding element (9). The fastening sleeve (13) has a through opening (39) through which the fastening means (15) is guidable. An assemblage (1) having such a holder (3) is also described. A connecting method is furthermore described.

Methods and systems are provided for a direct injection fuel pump. The methods and system control pressure within a compression chamber so as to improve fuel pump lubrication.

The invention relates to a plunger (1) for a fuel injection pump, having a tube-like housing (2), which accommodates a roller (4) for the running of a periodic lift generator inside the inner jacket (5) thereof in the region of a first ring end (3). Said roller has axial stumps (7) projecting from the end faces (6) of the roller, by means of which stumps the roller sits in recesses (8) in the housing (2), wherein the housing (2) is penetrated axially by a bridge piece (9) underneath the roller (4), the underside (11) of which bridge piece, which faces a second ring end (10) of the housing (2), acts as a rest for a plunger following part. The inner jacket (5) of the housing (2), proceeding from the first ring end thereof in the direction of the second rind end (3, 10) and at least in the circumferential section (13) thereof, which surrounds an outer jacket (12) of the roller (4), has a pocket-like thinned portion of material (14), which levels out under a half of the height of the roller (4) and into which the ring edges (15) of the roller (4) project.

Disclosed herein is the structure of a GDI fuel delivery pipe. The structure of a GDI fuel delivery pipe includes: a main pipe configured to flow fuel through a hollow formed therein; a plurality of injector cups formed in cylindrical shapes having open lower ends, and configured to be coupled and fastened to the main pipe, to flow fuel therethrough, and to be coupled to respective injectors; a plurality of mount M holders configured to form tubular parts each having a bolt hole in a lengthwise direction, and to be coupled and fastened to the main pipe; and fastening members configured to fasten the plurality of injector cups or mount holders to the main pipe by being coupled to the outer circumferential surface of the main pipe at both left and right ends thereof while surrounding the outer circumferences of the plurality of injector cups or mount holders.

The invention relates to a high-pressure pump (1) which serves in particular for fuel injection systems of internal combustion engines, comprising a low pressure chamber (4) configured as a power unit chamber (4) and a drive (5) which is disposed at least partially in the low pressure chamber (4). In operation pressure pulses are generated in the low pressure chamber (4) by the drive unit (5). A damping device (30) is provided which on the one hand is coupled to the low pressure chamber (4) and on the other hand is connected to a low pressure level (25) which in operation is located below a pressure (p1) in the low pressure chamber (4). The damping device (30) has a piston which is displaceable in a piston bore (33) and which not only is acted upon by the pressure (p1) in the low pressure chamber (4) against a spring force of a spring element (36) but also delimits a vapour chamber (34) in the piston bore (33). Furthermore the damping device (30) has a pressure relief means (37) which connects the vapour chamber (34) at least intermittently to the low pressure level (25).

A holder is used for fastening a fuel distributor to an internal combustion engine. The holder has a base element which is connected to the fuel distributor. A slotted sleeve is provided, which is connected to the base element, and the base element is braced on the internal combustion engine via the slotted sleeve. Furthermore, a system having the fuel distributor and a plurality of holders of this type is provided.

A fuel injection valve having a valve retaining body (1), which has a longitudinal axis (2) and in which a central spring chamber (5) is embodied. In this spring chamber (5), a closing spring (6) is disposed, which transmits a closing force to a valve member (30), which valve member (30) cooperates with a valve seat (32) for controlling at least one injection opening (36). In the wall of the spring chamber (5), an inlet conduit (3) extends parallel to the longitudinal axis (2) of the valve retaining body (1), and by way of this conduit, fuel at high pressure can be delivered to the at least one injection opening (36). The cross section of the inlet conduit (3) has a greater length in the circumferential direction than in the radial direction, so that the wall region between the inlet conduit (3) and the spring chamber (5), or the outer jacket face of the valve retaining body (1), is larger than in the case of an inlet conduit (3) with the same size of cross-sectional area and a circular cross-sectional contour (FIG. 1).

A fuel line may include a hollow elongate body having a first end and a second end. A first sealing member located on the first end of the hollow elongate body may have a monolithic construction and include a base region and a sealing region. The base region may have a first material hardness and the sealing region may have a second material hardness, the second material hardness being less than the first material hardness. A first connector may be coupled with the elongate body and the first connector and the first sealing member may be configured to sealingly connect to a fuel injector.

Provided is a solution to various limitations caused by product shape and the like. An autofrettage machining device characterized in comprising: a workpiece that is sealed off except for the workpiece end opening and in which a pressurized chamber is filled with a hydraulic oil via the workpiece end opening; a jig capable of being attached and detached from the workpiece, having an internal direct flow channel, and in which the direct flow channel is in communication without leakage with the workpiece end opening via a seal part; a piston for forming a gap having a predetermined average gap size with the inner wall of the direct flow channel provided inside the jig; and a pressurizing unit for driving the piston.

The invention relates to a bearing element having a roller rotatably mounted therein, in particular in a drive of a pump piston of a high-pressure fuel pump, wherein the bearing element (44) comprises a concavely curved recess (48) in which the at least approximately circular cylindrical roller (50) is rotatably mounted. The recess (48) is curved at least in a central area (148) at least approximately as a circular segment in cross section perpendicular to the axis of rotation (51) of the roller (50), and the radius (R) thereof is equal to or only slightly greater than the radius (r) of the roller (50). The recess (48) extends over an angle range of more than 180 DEG around the circumference of the roller (50). The central area (148) of the recess (48) extends over an angle range of no greater than about 180 DEG about the circumference of the roller (50) and the recess (48) comprises edge areas (248, 348) adjacent to the central area (148) in the circumferential direction, in which the recess (48) runs, having a greater radial distance from the roller (50) than in the central area (148).