CN103953484A - Diesel injector for diesel engine - Google Patents
Diesel injector for diesel engine Download PDFInfo
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- CN103953484A CN103953484A CN201410133457.XA CN201410133457A CN103953484A CN 103953484 A CN103953484 A CN 103953484A CN 201410133457 A CN201410133457 A CN 201410133457A CN 103953484 A CN103953484 A CN 103953484A
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Abstract
The invention discloses a diesel injector for a diesel engine. The diesel injector comprises a needle valve, a needle valve body, a fastening screw cap and a diesel containing cavity; the needle valve is arranged in the needle valve body; the diesel containing cavity is arranged between the needle valve and the needle valve body; the needle valve body is provided with a support surface; the fastening screw cap is provided with a protruded part; the annular lower surface of the support surface of the needle valve body is fitted with the annular upper surface of the protruded part of the fastening screw cap, so a match sealing surface is formed; an expanded hole is formed in the inside of the needle valve body; the expanded hole is positioned in the topmost end of the match surface between the needle valve body and the needle valve. The expanded hole is additionally formed in the needle valve, so the aim that the radial friction force of a needle valve coupler is not increased by the top deformation of the match surface between the needle valve body and the needle valve is effectively ensured, and the control precision and stability of the spraying are improved.
Description
Technical field
The present invention relates to fuel injection system, relate in particular to a kind of oil sprayer for diesel engine.
Background technique
Diesel engine high-pressure co-rail spraying technique is current raising diesel engine performance and the effective measures that reduce discharge.Diesel engine high-pressure co-rail system has that injection pressure flexibility is adjustable, injection timing, control flexibly and the feature such as fuel injection quantity free adjustment, can effectively reduce engine fuel consumption and discharge and improve power character.High pressure common rail electric control fuel injector is the core key part of high pressure co-rail system, and its structural parameter and performance directly have influence on the service behaviours such as the speed of response, injection rate, reliability of whole high pressure co-rail system.
Existing high pressure common rail electric control fuel injector is mainly comprised of needle-valve body, needle-valve, fastening nut, control plunger, control plunger bushing, orifice plate, armature, armature guide way, oil injector body etc.Needle-valve is arranged in needle-valve body; Fastening nut is fastened together needle-valve body, oil injector body, controls plunger, control plunger bushing, orifice plate, armature, armature guide way etc. and is installed in oil injector body.Orifice plate is provided with oil-feed metering-orifice and fuel-displaced metering-orifice, and the aperture of oil-feed metering-orifice is less than the aperture of fuel-displaced metering-orifice.
The groundwork process of existing high pressure common rail electric control fuel injector is:
High pressure fuel is divided into two-way after entering electric-controlled fuel injector by common rail pipe, and a road flows to the control chamber of controlling plunger place; Another road flows to the Sheng oil pocket at needle-valve place.When solenoid valve dead, armature is pressed on valve seat by armature spring.Control chamber and Sheng oil pocket are communicated with, and internal pressure is equal, and control chamber inner high voltage fuel oil produces a downward fuel oil hydraulic coupling to controlling plunger.In containing oil pocket, high pressure fuel produces a fuel oil hydraulic coupling making progress to needle-valve, and downward hydraulic coupling is greater than hydraulic coupling upwards.In addition, the downward impacting force of return spring is also born in needle-valve top, causes needle-valve to be pressed on above needle valve seat, not oil spout of electric-controlled fuel injector.
When ECU (Electrical Control Unit) encourages to solenoid valve, electromagnetic force drives armature to rise, the ball valve of orifice plate top is opened, because the aperture of the oil-feed metering-orifice of orifice plate is less than the aperture of fuel-displaced metering-orifice, pressure in control chamber declines rapidly, control chamber inner high voltage fuel oil reduces rapidly controlling the downward fuel oil hydraulic coupling of plunger, and the pressure reduction of generation causes needle-valve to start to move upward, fuel injection beginning.During end of injection, solenoid valve power-off, armature starts to take a seat under the effect of return spring, oil pump capacity bore closure, fuel oil is by oil-feed metering-orifice to oil-filled in control chamber, and control chamber internal pressure starts to rise, and high pressure re-establishes.The fuel oil hydraulic coupling producing in control chamber and needle-valve return spring elastic force sum are greater than while containing the fuel oil hydraulic coupling making progress that oil pocket produces, and control plunger and move downward together with starting with needle-valve, until needle-valve takes a seat, end of injection.
Can see, high pressure common rail electric control fuel injector is in work engineering, and needle-valve is controlled chamber and contains the acting in conjunction of a plurality of complex external forces such as the interior hydraulic coupling of oil pocket, spring force, couple gap frictional force; In addition, the parts such as needle-valve body, oil injector body are pressed on oil injector body by the screw thread power between fastening nut and oil injector body, and needle-valve body is also subject to the fastening nut impacting force that produces etc. that is threaded with oil injector body simultaneously.In general, high pressure common rail electric control fuel injector will be realized injection accurate, stable under high pressure and control, the stability of motions of needle-valve is most important, and under above-mentioned multiple External Force Acting, needle-valve body inner chamber can produce distortion, thereby the radial friction that strengthens needle-valve body and needle-valve, affects electric-controlled fuel injector performance.
Therefore, those skilled in the art is devoted to develop a kind of high pressure common rail electric control fuel injector, can effectively reduce the suffered radial frictional force of electric-controlled fuel injector pintle nozzle match-ing parts, improves the stability of motions of needle-valve.
Summary of the invention
Because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide a kind of oil sprayer for diesel engine, can effectively reduce the suffered radial frictional force of Performance of Fuel Injection Nozzle, improves the stability of motions of needle-valve.
For achieving the above object, first aspect of the present invention, provides a kind of oil sprayer for diesel engine, comprises needle-valve, needle-valve body, fastening nut and Sheng oil pocket; Described needle-valve and described needle-valve body form pintle nozzle match-ing parts, and described needle-valve is arranged in described needle-valve body, and described Sheng oil pocket is arranged between described needle-valve and described needle-valve body; Described needle-valve body has supporting surface, and described fastening nut has bump; The annular upper surface laminating of the annular lower surface of the supporting surface of described needle-valve body and the bump of fastening nut, forms matching trim; The inner side of described needle-valve body is provided with reaming, and described reaming is positioned at the top of the fitting surface of described needle-valve body and described needle-valve.
Further, described counter bore diameter increases by 0.1～3mm than the diameter of needle-valve, and the described reaming degree of depth is vertically 0.5～8mm.
Further, be provided with the needle-valve of plane below, Sheng place, oil pocket bottom surface and the fitting surface between needle-valve body and be provided with radial clearance; Described radial clearance increases by 0.3～2mm than the diameter of described needle-valve.
Further, the plane at the end face place of described Sheng oil pocket is higher than the described matching trim of described needle-valve body and the formation of described fastening nut.
Further, the described matching trim that the plane at the end face place of described Sheng oil pocket forms higher than described needle-valve body and described fastening nut is twice needle-valve guiding diameter at least.
Wherein, described needle-valve guiding diameter and needle-valve body mesopore guiding equal diameters.
Further, at the described needle-valve above the plane of described Sheng oil pocket end face place and the fitting surface place between described needle-valve body, be provided with radial clearance.
Further, the width of radial clearance is 0.1～3mm, and the height of radial clearance is 0.5～8mm.
Wherein, the width direction of radial clearance is the direction perpendicular to needle-valve medial axis, and the short transverse of radial clearance is the direction that is parallel to needle-valve medial axis.
Aspect second of the present invention, a kind of high pressure common rail electric control fuel injector is provided, comprise the oil sprayer described in first aspect of the present invention.
Aspect the 3rd of the present invention, a kind of hydraulic injection device is also provided, comprise the oil sprayer described in first aspect of the present invention.
As can be seen here, the present invention has following technique effect:
1, the present invention sets up reaming at needle-valve place, effectively guarantees that the top distortion of needle-valve body and needle-valve fitting surface can not cause pintle nozzle match-ing parts radial frictional force to increase, thereby can improve, sprays precision and the stability thereof of controlling.
2, needle-valve body and the needle-valve precision-fit section of containing oil pocket below of being positioned at of the present invention is provided with radial clearance, can avoid the radial frictional force of the Performance of Fuel Injection Nozzle that the radial deformation of needle-valve or needle-valve body introduces, precision and the stability of motions of the control of raising needle-valve.
3, the position of Sheng oil pocket of the present invention is higher than the matching trim of needle-valve body and fastening nut formation, can effectively reduce the mesopore amount of deformation of the needle-valve body that is positioned at matching trim top, and then reduce the suffered radial frictional force of Performance of Fuel Injection Nozzle, improve the stability of motions of needle-valve.
4, oil sprayer of the present invention is easy to realize, and is applicable to high pressure common rail electric control fuel injector and hydraulic injection device, has universality.
Below with reference to accompanying drawing, the technique effect of design of the present invention, concrete structure and generation is described further, to understand fully object of the present invention, feature and effect.
Accompanying drawing explanation
Fig. 1 is the structure diagram of the oil sprayer of a kind of preferred embodiment of the present invention;
Fig. 2 is the partial enlarged drawing of the oil sprayer in Fig. 1;
Fig. 3 is the needle-valve body of another kind of preferred embodiment of the present invention and the plan view of needle-valve assemblying body;
Fig. 4 is the needle-valve body of another kind of preferred embodiment of the present invention and the partial sectional view of needle-valve assemblying body.
Embodiment
Embodiment 1
As shown in Figure 1, a kind of oil sprayer for diesel engine, comprises needle-valve 1, needle-valve body 2, fastening nut 3 and contains oil pocket 4 etc.Needle-valve 1, needle-valve body 2 form pintle nozzle match-ing parts, needle-valve 1 is arranged in needle-valve body 2 by precision-fit, needle-valve body 2 has supporting surface 201, fastening nut 3 has bump 301, the annular upper surface laminating of the annular lower surface of the supporting surface 201 of needle-valve body 2 and the bump of fastening nut 3, forms matching trim.Containing oil pocket 4 is arranged between needle-valve 1 and needle-valve body 2.The plane at the sealing surface place that the bump of the supporting surface of needle-valve body 2 201 and fastening nut 3 301 is formed is set as L1, and the end face place plane of containing oil pocket 4 is set as to L2.In the situation that contain the plane L1 at the sealing surface place that the plane L2 at the end face place of oil pocket 4 do not form higher than needle-valve body 2 and fastening nut 3, make to contain oil pocket 4 and approach the sealing surface that needle-valve body 2 and fastening nut 3 form as far as possible.The plane L1 at the sealing surface place that preferably, the plane L2 at the end face place of Sheng oil pocket 4 can form with needle-valve body 2 and fastening nut 3 is coplanar.
Further, inventor is in the installation for oil sprayer fixedly time, the plane L1 that finds sealing surface place is subject to active force upwards, this active force make needle-valve body mesopore guide section at plane L1 the trend with the oriented interior contraction in upper part, this deformation tendency can cause the gap between needle-valve body mesopore and needle-valve to have the trend of dwindling, thereby cause pintle nozzle match-ing parts sliding not good (motion retardance), cause spraying control characteristic unstable.The impact bringing in order to reduce this distortion, inventor further proposes, and the plane at the end face place of Sheng oil pocket is higher than the matching trim of needle-valve body and fastening nut formation.Preferably, contain at least twice needle-valve guiding diameter of matching trim that the plane at the end face place of oil pocket forms higher than needle-valve body and fastening nut; Make needle-valve body guide section away from stress area, mesopore amount of deformation reduces, thereby the impact of sliding is also reduced.
Wherein, needle-valve guiding diameter and needle-valve body mesopore guiding equal diameters.
Can find out, compared with prior art, contain oil pocket 4 moves on the position between needle-valve 1 and needle-valve body 2, make to contain oil pocket 4, needle-valve body 2 and needle-valve 1 precision-fit section and try one's best near the matching trim of needle-valve body 2 and fastening nut 3, even higher than the matching trim of needle-valve body 2 and fastening nut 3, thereby can avoid external influence power to bring as far as possible, the inner chamber of this place's Sheng oil pocket and needle-valve body is out of shape; And then reduce the suffered radial frictional force of Performance of Fuel Injection Nozzle, improve the stability of motions of needle-valve.
Further, as shown in Figure 2, when containing oil pocket 4, on the position between needle-valve 1 and needle-valve body 2, move after (away from spray orifice one end), below the bottom surface of being located at Sheng oil pocket 4, the needle-valve 1 of (near spray orifice one end) is set up one section of radial clearance with the precision-fit face place of needle-valve body 2, guarantee that needle-valve body 2 and the precision-fit section of needle-valve 1 below the fitted seal of fastening nut 3 are not affected by external force, the needle-valve body 2 inner chamber distortion of further avoiding external force to bring.Preferably, containing the needle-valve 1 of below, bottom surface of oil pocket 4 and the radial clearance at the fitting surface place of needle-valve body 2 (width) is 0.3～2mm.
Compared with prior art, the needle-valve body and the needle-valve precision-fit section that are positioned at Sheng oil pocket below are provided with radial clearance, the radial frictional force that can avoid the Performance of Fuel Injection Nozzle that the radial deformation of needle-valve or needle-valve body introduces, improves precision and the stability of motions of the control of needle-valve.
Alternatively, in conjunction with Fig. 1, the needle-valve 1 between the plane L1 at the sealing surface place forming between needle-valve body 2 and fastening nut 3 and Sheng oil pocket 4 end face place plane L2 and the fitting surface between needle-valve body 2 are provided with radial clearance, and radial clearance is at least 0.3mm.
When matching trim that the plane that the end face place of containing oil pocket 4 is set forms higher than needle-valve body and fastening nut, containing the needle-valve of top face of oil pocket and the fitting surface place between needle-valve body, be provided with radial clearance.The width of radial clearance is 0.1～3mm, and the height of radial clearance is 0.5～8mm.
Wherein, the width direction of radial clearance is the direction perpendicular to needle-valve medial axis, and the short transverse of radial clearance is the direction that is parallel to needle-valve medial axis.
Can be understood that, at the needle-valve of the top face at Sheng oil pocket and the fitting surface place between needle-valve body, radial clearance is set, equally, the radial frictional force that can avoid being positioned at the Performance of Fuel Injection Nozzle of containing the needle-valve of oil pocket top or the radial deformation introducing of needle-valve body, improves precision and the stability of motions of the control of needle-valve.
The oil sprayer of the present embodiment is applicable to electric-controlled fuel injector and hydraulic injection device, has universality.
Preferably, a kind of high pressure common rail electric control fuel injector with above-mentioned oil sprayer, also comprise parts such as controlling plunger, control plunger bushing, orifice plate, armature, armature guide way, oil injector body, between needle-valve 1 and needle-valve body 2, form and contain oil pocket 4, control plunger, control formation control chamber between plunger bushing and orifice plate, in oil injector body, be provided with main oil gallery.Control plunger and be arranged in control plunger bushing, its outer surface forms fitting surface with the surface of controlling the interior bone of plunger bushing.Armature is arranged in armature guiding, and the internal surface of the interior bone of its outer surface and armature guide way also forms fitting surface.Orifice plate is provided with oil-feed metering-orifice and fuel-displaced metering-orifice, and the aperture of oil-feed metering-orifice is less than the aperture of fuel-displaced metering-orifice.Fastening nut 3 is fastened together the assembly integral body such as needle-valve body 2, oil injector body, controls plunger, control plunger bushing, orifice plate, armature, armature guide way etc. and is installed in oil injector body.Wherein, the plane at the end face place of Sheng oil pocket is higher than the matching trim of needle-valve body and fastening nut formation.Preferably, contain at least twice needle-valve guiding diameter of matching trim that the plane at the end face place of oil pocket forms higher than needle-valve body and fastening nut.At the needle-valve of the top face at Sheng oil pocket and the fitting surface place between needle-valve body, be provided with radial clearance.The width of radial clearance is 0.1～3mm, and the height of radial clearance is 0.5～8mm.Containing needle-valve below the bottom surface of oil pocket and the fitting surface place between needle-valve body, be provided with radial clearance, radial clearance (width) is 0.3～2mm.
The high pressure common rail electric control fuel injector of the present embodiment, contain the position of oil pocket higher than the matching trim of needle-valve body and fastening nut formation, can effectively reduce the mesopore amount of deformation of the needle-valve body that is positioned at matching trim top, and then reduce the suffered radial frictional force of Performance of Fuel Injection Nozzle, improve the stability of motions of needle-valve.In addition, the needle-valve body and the needle-valve precision-fit section that are positioned at Sheng oil pocket top and/or below are provided with radial clearance, can avoid the radial frictional force of the Performance of Fuel Injection Nozzle that the radial deformation of needle-valve or needle-valve body introduces, improve precision and the stability of motions of the control of needle-valve, and simple in structure, be easy to realize, there is good using value.
Embodiment 2
The structure similar of the oil sprayer for diesel engine that provided in the present embodiment and embodiment 1 oil sprayer, comprises equally needle-valve 1, needle-valve body 2, fastening nut 3 and contains oil pocket 4 etc.Annexation between each element, with identical described in embodiment 1, repeats no more herein.
As different from Example 1, in conjunction with Fig. 2-Fig. 4, in the oil sprayer providing in the present embodiment, on needle-valve body 2, be provided with two symmetrical positioning pin holes 21 and two symmetrical oil-feed oil ducts 23.The upper surface that positioning pin hole 21 is located at needle-valve body 2 vertically downward vertically.Referring to Fig. 2 and Fig. 3, the one end that is positioned at the oil-feed oil duct 23 of needle-valve body 2 is connected with Sheng oil pocket 4, and the other end forms two oil-feed oilholes 31 at the upper surface of needle-valve body 2.Different from asymmetric arrangement of the prior art, the central axis of two positioning pin hole 21 relative needle-valve bodies 2 is arranged symmetrically with, two oil-feed oil ducts 23 also relatively the central axis of needle-valve body 2 be arranged symmetrically with, two positioning pin holes 21 are evenly arranged with the central axis of two oil-feed oilhole 31 relative needle-valve bodies.
The layout symmetrically and evenly of two positioning pin holes 21 and two the relative needle-valve body of oil-feed oilhole 31 2 medial axis, can effectively improve the symmetry properties of needle-valve body 2 structures, the precision-fit section that makes needle-valve body 2 and needle-valve 1 assymmetrical deformation under the screw thread impacting force of fastening nut 3 and other External Force Actings reduces, and then guarantee that needle-valve 1 and the radial frictional force of needle-valve body 2 reduce, and improve the precision and stability of Performance of Fuel Injection Nozzle.
Further, as shown in Figure 4, positioning pin hole 21 digs deep hole along extending axially under direction of needle-valve body 2, is no more than the plane that coordinates of needle-valve body 2 and fastening nut 3 at the bottom of the hole of positioning pin hole 21.Preferably, it is coplanar that positioning pin hole 21 is located at the plane at the sealing surface place that the axial base plane of needle-valve body 2 and needle-valve body 2 and fastening nut 3 form.Thereby further improve the symmetry properties of needle-valve body 2 structures, the fitting surface that reduces needle-valve body 2 and needle-valve 1 assymmetrical deformation and frictional force of causing under the screw thread impacting force of fastening nut 3 and other External Force Actings.
Equally, at the oil sprayer of the present embodiment, the position of containing oil pocket 4 can also be set, make to contain oil pocket 4 and move on the position between needle-valve 1 and needle-valve body 2, on the size of radial clearance of the position moved and the fitting surface between needle-valve and needle-valve body identical with embodiment 1, repeat no more herein.
Thus, oil sprayer of the present invention is contained the symmetrical of the position of oil pocket 4 and positioning pin hole 21 and oil-feed oil duct 23 by arranging, and guarantees that needle-valve body 2 and needle-valve 1 precision-fit section are not affected by external force, the needle-valve body 2 inner chambers distortion of avoiding external force to bring; And the symmetry properties that improves needle-valve body 2 structures, needle-valve body 2 reduces with fitting surface assymmetrical deformation under screw thread impacting force and other External Force Actings of needle-valve 1; Thereby realize, effectively reduce the suffered radial frictional force of Performance of Fuel Injection Nozzle, improve the precision and stability of needle-valve 1 motion; Simple in structure, be easy to realize, there is good using value.
In addition, the oil sprayer providing in the present embodiment can also comprise two cooling oil ducts and be arranged on the cooling oil chamber in needle-valve body 2, cold oil enters in cooling oil chamber through armature guide way, control plunger bushing, needle-valve body 2 successively along the first cooling oil duct, after half circumference circulation of the cooling oil chamber in needle-valve body 2, along the second cooling oil duct, through needle-valve body 2, control plunger bushing and armature guide way, turn back to the cooling oil duct on oil injector body successively, realize a cold oil cycle period.Two cooling oil ducts that are positioned at needle-valve body 2, its one end is connected with cooling oil chamber, and the other end forms two cooling oilholes at the upper surface of needle-valve body 2.
The central axis of two positioning pin hole 21 relative needle-valve bodies 2 is arranged symmetrically with, two oil-feed oil ducts 23 also relatively the central axis of needle-valve body 2 be arranged symmetrically with, two the relative needle-valve body of cooling oil duct medial axis are arranged symmetrically with.In addition, two positioning pin holes 21 are evenly arranged with the central axis of two relative needle-valve bodies 2 of cooling oilhole with two oil-feed oilholes 31.
By above-mentioned improvement, the layout symmetrically and evenly of two positioning pin holes 21, two oil-feed oilholes 31 and two the relative needle-valve body of cooling oilhole 2 medial axis, can further improve the symmetry properties of needle-valve body 2 structures, the precision-fit section that makes needle-valve body 2 and needle-valve 1 assymmetrical deformation under the screw thread impacting force of fastening nut 3 and action of hydraulic force reduces, and then guarantee that needle-valve 1 and the radial frictional force of needle-valve body 2 reduce, and improve the precision and stability of high pressure common rail electric control fuel injector.
Equally, the oil sprayer of the present embodiment is applicable to electric-controlled fuel injector and hydraulic injection device, has universality.
Preferably, a kind of high pressure common rail electric control fuel injector with above-mentioned oil sprayer, also comprise parts such as controlling plunger, control plunger bushing, orifice plate, armature, armature guide way, oil injector body, between needle-valve 1 and needle-valve body 2, form and contain oil pocket 4, control plunger, control formation control chamber between plunger bushing and orifice plate, in oil injector body, be provided with main oil gallery.Control plunger and be arranged in control plunger bushing, its outer surface forms fitting surface with the surface of controlling the interior bone of plunger bushing.Armature is arranged in armature guiding, and the internal surface of the interior bone of its outer surface and armature guide way also forms fitting surface.Orifice plate is provided with oil-feed metering-orifice and fuel-displaced metering-orifice, and the aperture of oil-feed metering-orifice is less than the aperture of fuel-displaced metering-orifice.Fastening nut 3 is fastened together the assembly integral body such as needle-valve body 2, oil injector body, controls plunger, control plunger bushing, orifice plate, armature, armature guide way etc. and is installed in oil injector body.
Visible, the high pressure common rail electric control fuel injector of the present embodiment, the layout symmetrically and evenly of positioning pin hole and two the relative needle-valve body of oil-feed oilhole medial axis, can effectively improve the symmetry properties of needle valve structure, the precision-fit section that makes needle-valve body and needle-valve assymmetrical deformation under external force reduces, and then guarantee that needle-valve and the radial frictional force of needle-valve body reduce, the precision and stability of raising Performance of Fuel Injection Nozzle.In addition, the positioning pin hole of the present embodiment digs deep hole along extending axially under direction of needle-valve body, can further improve the symmetry properties of needle valve structure, thereby further improves the precision and stability of Performance of Fuel Injection Nozzle.In addition, the position of the Sheng oil pocket of the present embodiment is higher than the matching trim of needle-valve body and fastening nut formation, can effectively reduce the mesopore amount of deformation of the needle-valve body that is positioned at matching trim top, and then reduce the suffered radial frictional force of Performance of Fuel Injection Nozzle, improve the stability of motions of needle-valve, and simple in structure, be easy to realize, there is good using value.
Embodiment 3
In the present embodiment, the oil sprayer that provided in the present embodiment and the structure similar of the oil sprayer in embodiment 1 or 2, comprise equally needle-valve 1, needle-valve body 2, fastening nut 3 and contain oil pocket 4 etc.Annexation between each element, with identical described in embodiment 1 or 2, repeats no more herein.
Different from embodiment 1 or 2, in conjunction with Fig. 2, the inner side of needle-valve body 2 is provided with reaming 22, and reaming is positioned at the top of the fitting surface of needle-valve body 2 and needle-valve 1.The design of width (diameter) radially of reaming 22 and the degree of depth is vertically not less than the radial deformation of needle-valve body 2 and needle-valve 1.Specifically, reaming 22 diameters increase by 0.1～3mm than the diameter of needle-valve 1.Reaming 22 degree of depth is vertically 0.5～8mm.Thus, by needle-valve body 2 and the upper end of the fitting surface of needle-valve 1, increase the setting of one section of reaming 22, can effectively guarantee that needle-valve body 2 and the top distortion of the fitting surface of needle-valve 1 can not cause pintle nozzle match-ing parts radial frictional force to increase.
Further, at the needle-valve of the top face at Sheng oil pocket and the fitting surface place between needle-valve body, be provided with radial clearance.The width of radial clearance is 0.1～3mm, and the height of radial clearance is 0.5～8mm.Needle-valve below the bottom surface of containing oil pocket and the fitting surface place between needle-valve body, be provided with radial clearance.Radial clearance (width) is 0.3～2mm.
Wherein, the width direction of radial clearance is the direction perpendicular to needle-valve medial axis, and the short transverse of radial clearance is the direction that is parallel to needle-valve medial axis.
Equally, at the oil sprayer of the present embodiment, the position of containing oil pocket 4 can also be set, make to contain oil pocket 4 and move on the position between needle-valve 1 and needle-valve body 2, on the size of radial clearance of the position moved and the fitting surface between needle-valve and needle-valve body identical with embodiment 1, repeat no more herein.
In addition, at the oil sprayer of the present embodiment, the position of positioning pin hole, oil-feed oilhole and/or cooling oilhole can also be set, concrete identical with embodiment 2, do not repeat them here.
This shows, the oil sprayer providing of the present invention, by the position of containing oil pocket is set, guarantees that needle-valve body 2 and needle-valve 1 precision-fit section are not affected by external force, the needle-valve body 2 inner chamber distortion of avoiding external force to bring; By the symmetrical of positioning pin hole 21, oil-feed oil duct and cooling oil duct is set, improve the symmetry properties of needle valve structure, needle-valve body 2 reduces with fitting surface assymmetrical deformation under screw thread impacting force and action of hydraulic force of needle-valve 1; By the reaming 22 of the upper end of needle-valve body 2 and needle-valve 1 fitting surface is set, guarantee that needle-valve body 2 and the top distortion of the fitting surface of needle-valve 1 can not cause pintle nozzle match-ing parts radial frictional force to increase.And then realization effectively reduces the suffered radial frictional force of Performance of Fuel Injection Nozzle, the precision and stability of raising needle valve movement.Simple in structure, be easy to realize, there is good using value.
Equally, the oil sprayer of the present embodiment is applicable to electric-controlled fuel injector and hydraulic injection device, has universality.
Preferably, a kind of high pressure common rail electric control fuel injector with above-mentioned oil sprayer, also comprise parts such as controlling plunger, control plunger bushing, orifice plate, armature, armature guide way, oil injector body, between needle-valve 1 and needle-valve body 2, form and contain oil pocket 4, control plunger, control formation control chamber between plunger bushing and orifice plate, in oil injector body, be provided with main oil gallery.Control plunger and be arranged in control plunger bushing, its outer surface forms fitting surface with the surface of controlling the interior bone of plunger bushing.Armature is arranged in armature guiding, and the internal surface of the interior bone of its outer surface and armature guide way also forms fitting surface.Orifice plate is provided with oil-feed metering-orifice and fuel-displaced metering-orifice, and the aperture of oil-feed metering-orifice is less than the aperture of fuel-displaced metering-orifice.Fastening nut 3 is fastened together the assembly integral body such as needle-valve body 2, oil injector body, controls plunger, control plunger bushing, orifice plate, armature, armature guide way etc. and is installed in oil injector body.
Can find out, the high pressure common rail electric control fuel injector that the present embodiment provides, guarantees that the top distortion of needle-valve body and needle-valve fitting surface can not cause pintle nozzle match-ing parts radial frictional force to increase, thereby can improve, sprays precision and the stability thereof of controlling.In addition, the needle-valve body and the needle-valve precision-fit section that are positioned at Sheng oil pocket below of the present embodiment are provided with radial clearance, the radial frictional force that can avoid the Performance of Fuel Injection Nozzle that the radial deformation of needle-valve or needle-valve body introduces, improves precision and the stability of motions of the control of needle-valve.In addition, the position of the Sheng oil pocket of the present embodiment is higher than the matching trim of needle-valve body and fastening nut formation, can effectively reduce the mesopore amount of deformation of the needle-valve body that is positioned at matching trim top, and then reduce the suffered radial frictional force of Performance of Fuel Injection Nozzle, improve the stability of motions of needle-valve.
Can be understood that, the present invention is directed to the transformation of oil sprayer, can select it and partly or entirely carry out independent assortment, at this, not enumerate.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just can design according to the present invention make many modifications and variations without creative work.Therefore, all technician in the art, all should be in the determined protection domain by claims under this invention's idea on the basis of existing technology by the available technological scheme of logical analysis, reasoning, or a limited experiment.
Claims (9)
1. for an oil sprayer for diesel engine, it is characterized in that, comprise needle-valve, needle-valve body, fastening nut and Sheng oil pocket; Described needle-valve is arranged in described needle-valve body, and described Sheng oil pocket is arranged between described needle-valve and described needle-valve body; Described needle-valve body has supporting surface, and described fastening nut has bump; The annular upper surface laminating of the annular lower surface of the supporting surface of described needle-valve body and the bump of fastening nut, forms matching trim; The inner side of described needle-valve body is provided with reaming, and described reaming is positioned at the top of the fitting surface of described needle-valve body and described needle-valve.
2. the oil sprayer for diesel engine as claimed in claim 1, is characterized in that, described counter bore diameter increases by 0.1～3mm than the diameter of needle-valve, and the described reaming degree of depth is vertically 0.5～8mm.
3. the oil sprayer for diesel engine as claimed in claim 1, is characterized in that, is provided with the needle-valve of plane top, Sheng oil pocket end face place and the fitting surface between needle-valve body and is provided with radial clearance; Described radial clearance increases by 0.1～3mm than the diameter of described needle-valve.
4. the oil sprayer for diesel engine as claimed in claim 1, is characterized in that, the plane at the end face place of described Sheng oil pocket is higher than the described matching trim of described needle-valve body and the formation of described fastening nut.
5. the oil sprayer for diesel engine as claimed in claim 4, is characterized in that, the described matching trim that the plane at the end face place of described Sheng oil pocket forms higher than described needle-valve body and described fastening nut is twice needle-valve guiding diameter at least.
6. the oil sprayer for diesel engine as claimed in claim 1, is characterized in that, at the described needle-valve below described Sheng oil pocket bottom surface and the fitting surface place between described needle-valve body, is provided with radial clearance.
7. the oil sprayer for diesel engine as claimed in claim 6, is characterized in that, described radial clearance is 0.3～2mm.
8. a high pressure common rail electric control fuel injector, is characterized in that, comprises the oil sprayer as described in claim 1～7 arbitrary.
9. a hydraulic injection device, is characterized in that, comprises the oil sprayer as described in claim 1～7 arbitrary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410133457.XA CN103953484B (en) | 2013-10-24 | 2014-04-03 | Fuel injector for diesel engine |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013105116368 | 2013-10-24 | ||
| CN201310511636.8 | 2013-10-24 | ||
| CN201310511636 | 2013-10-24 | ||
| CN201410133457.XA CN103953484B (en) | 2013-10-24 | 2014-04-03 | Fuel injector for diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103953484A true CN103953484A (en) | 2014-07-30 |
| CN103953484B CN103953484B (en) | 2017-11-17 |
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Family Applications (6)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420161118.8U Expired - Lifetime CN203822514U (en) | 2013-10-24 | 2014-04-03 | Novel oil sprayer |
| CN201410133366.6A Pending CN103953483A (en) | 2013-10-24 | 2014-04-03 | Diesel injector |
| CN201420160499.8U Expired - Lifetime CN203867753U (en) | 2013-10-24 | 2014-04-03 | Oil sprayer |
| CN201410133277.1A Pending CN103953482A (en) | 2013-10-24 | 2014-04-03 | Diesel injector for diesel engine fuel system |
| CN201410133457.XA Active CN103953484B (en) | 2013-10-24 | 2014-04-03 | Fuel injector for diesel engine |
| CN201420161088.0U Expired - Lifetime CN203822513U (en) | 2013-10-24 | 2014-04-03 | Improved fuel injector |
Family Applications Before (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420161118.8U Expired - Lifetime CN203822514U (en) | 2013-10-24 | 2014-04-03 | Novel oil sprayer |
| CN201410133366.6A Pending CN103953483A (en) | 2013-10-24 | 2014-04-03 | Diesel injector |
| CN201420160499.8U Expired - Lifetime CN203867753U (en) | 2013-10-24 | 2014-04-03 | Oil sprayer |
| CN201410133277.1A Pending CN103953482A (en) | 2013-10-24 | 2014-04-03 | Diesel injector for diesel engine fuel system |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420161088.0U Expired - Lifetime CN203822513U (en) | 2013-10-24 | 2014-04-03 | Improved fuel injector |
Country Status (1)
| Country | Link |
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| CN (6) | CN203822514U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404192A (en) * | 2019-01-08 | 2019-03-01 | 北油电控燃油喷射系统(天津)有限公司 | A kind of electronic fuel injection and the fuel injector including it |
| CN114165380B (en) * | 2021-12-09 | 2024-02-06 | 重庆红江机械有限责任公司 | Low-speed electromechanical control oil sprayer and assembly method thereof |
| CN114165373A (en) * | 2021-12-17 | 2022-03-11 | 中国船舶重工集团公司第七一一研究所 | Fuel injector and common rail system |
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| JP4364864B2 (en) * | 2005-11-18 | 2009-11-18 | 株式会社デンソー | Variable injection hole injector |
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| DE102007002759A1 (en) * | 2007-01-18 | 2008-07-24 | Robert Bosch Gmbh | Fuel injector for injecting fuel into combustion chamber of internal combustion engine, has intermediate plate with step drill arranged between injector and nozzle bodies, and control and closing spaces, which are formed in step drill |
| JP2009275597A (en) * | 2008-05-14 | 2009-11-26 | Yanmar Co Ltd | Common rail injector |
| EP2187042A1 (en) * | 2008-11-14 | 2010-05-19 | Robert Bosch GmbH | An injector nozzle and a nozzle retaining nut with a reduced effective head friction diameter |
| CN101806266B (en) * | 2010-03-04 | 2012-07-11 | 哈尔滨工程大学 | Double-valve fuel injecting device with electric-control monoblock pump and electric-control fuel injector |
| KR101148683B1 (en) * | 2010-06-07 | 2012-05-21 | 현대중공업 주식회사 | Dual fuel injector valve by hybrid nozzle with dual fuel injection valve for diesel and gas engine |
| CN101963119B (en) * | 2010-11-08 | 2012-04-25 | 郑国璋 | Piezoelectric high-pressure common rail electronic control injector |
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- 2014-04-03 CN CN201420161118.8U patent/CN203822514U/en not_active Expired - Lifetime
- 2014-04-03 CN CN201410133366.6A patent/CN103953483A/en active Pending
- 2014-04-03 CN CN201420160499.8U patent/CN203867753U/en not_active Expired - Lifetime
- 2014-04-03 CN CN201410133277.1A patent/CN103953482A/en active Pending
- 2014-04-03 CN CN201410133457.XA patent/CN103953484B/en active Active
- 2014-04-03 CN CN201420161088.0U patent/CN203822513U/en not_active Expired - Lifetime
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| CN85102659A (en) * | 1985-04-01 | 1986-02-10 | 大连工学院 | Multi-hole injector with small pressure chamber |
| US7367517B2 (en) * | 2004-01-27 | 2008-05-06 | Denso Corporation | Fuel injection device inhibiting abrasion |
| CN1616814A (en) * | 2004-11-30 | 2005-05-18 | 大连理工大学 | Guide table type oil jet nozzle |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN203867753U (en) | 2014-10-08 |
| CN103953482A (en) | 2014-07-30 |
| CN103953484B (en) | 2017-11-17 |
| CN203822513U (en) | 2014-09-10 |
| CN203822514U (en) | 2014-09-10 |
| CN103953483A (en) | 2014-07-30 |
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Address after: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee after: The 711 Research Institute of China Shipbuilding Corp. Address before: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee before: Shanghai Marine Diesel Engine Research Institute |
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