CN208918729U - High pressure common rail injector for diesel engine - Google Patents
High pressure common rail injector for diesel engine Download PDFInfo
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- CN208918729U CN208918729U CN201821688238.8U CN201821688238U CN208918729U CN 208918729 U CN208918729 U CN 208918729U CN 201821688238 U CN201821688238 U CN 201821688238U CN 208918729 U CN208918729 U CN 208918729U
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- oil
- setting member
- hole
- valve rod
- stem lift
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- 239000000446 fuel Substances 0.000 claims abstract description 85
- NOQGZXFMHARMLW-UHFFFAOYSA-N Daminozide Chemical group CN(C)NC(=O)CCC(O)=O NOQGZXFMHARMLW-UHFFFAOYSA-N 0.000 claims description 16
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 13
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000002828 fuel tank Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- CYJRNFFLTBEQSQ-UHFFFAOYSA-N 8-(3-methyl-1-benzothiophen-5-yl)-N-(4-methylsulfonylpyridin-3-yl)quinoxalin-6-amine Chemical compound CS(=O)(=O)C1=C(C=NC=C1)NC=1C=C2N=CC=NC2=C(C=1)C=1C=CC2=C(C(=CS2)C)C=1 CYJRNFFLTBEQSQ-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- Fuel-Injection Apparatus (AREA)
Abstract
The utility model provides a kind of high pressure common rail injector for diesel engine, it is provided with stem lift setting member in oil-control chamber, the stem lift setting member is provided with the through-hole of the axis direction traveling along fuel injector, and it is provided at least one the oil-control channel for leading to its opposite another axial side from one axial direction side, to constitute a part in oil-control path.Oil-control channel is not less than the sectional area that oil-control chamber oil-feed port obtains at the inner sidewall of valve seat in the total sectional area on any section that the axis direction perpendicular to fuel injector obtains.When valve rod is in top dead centre, the other end that one end of through-hole is aligned with throttling passage and its is opposite is closed by the upper surface of valve rod.By using the high pressure common rail injector provided by the utility model for diesel engine, the number of parts for realizing stem lift set-up function can be reduced, it is ensured that when valve rod is in maximum lift point, oil-control path is truncated, avoids energy waste.
Description
Technical field
The utility model relates generally to fuel injector employed in diesel engine high-pressure co-rail system, which, which has, improves
Stem lift setting member.
Background technique
High-pressure common rail fuel feeding is widely used in diesel engine.High-pressure common rail is connected with fuel injector, and the latter will be for that will come from height
The high pressure fuel of pressure common rail is selectively ejected into the combustion chamber of diesel engine.
On market today in used fuel injector, the high pressure fuel from high-pressure common rail is via setting in the fuel injector
Shell on oil-feed port be fed into two oil circuits of fuel injector, i.e. oil-control path and oil spout path.Oil-control path is from confession
Hydraulic fluid port extends to the throttling passage in the valve seat that ball valve is arranged in via oil-control chamber, then returns to fuel tank through drainback passage.In ball
In the case that valve is opened, the high pressure fuel from oil-feed port can be flowed along oil-control path.
Fuel injector is additionally provided with valve rod.In existing fuel injector, the lift of valve rod is specifically by stem lift control assembly
To realize.The stem lift control assembly includes multiple components, for example, the setting ring, baffle ring, sleeve and the gear that are nested on valve rod
Plate etc..This construction causes to realize that number of components involved in stem lift set-up function is relatively more, so as to cause relatively high
Manufacturing cost and assembling cost.
Furthermore the use of the stem lift assignment component in existing fuel injector causes when valve rod is in top dead centre, control
Oil circuit footpath is still in opening state.In this case, the inevitable high pressure fuel that has always passes through oil-feed port, throttling passage stream
To drainback passage, fuel tank is then returned to, to cause the lasting waste existed with the energy of " cavitation corrosion " phenomenon at valve seat.
Utility model content
The purpose of the utility model is to provide a kind of high pressures for diesel engine with improved stem lift setting member
Common-rail injector, at least partly to overcome disadvantages mentioned above possessed by the high pressure common rail injector of the prior art.
The utility model provides a kind of high pressure common rail injector for diesel engine comprising: shell；Valve rod is set
It sets in the shell；Ball valve, is arranged in the valve seat of in the shell and upper end including surrounding valve rod, shell, valve seat and
Valve rod limits oil-control path jointly, which includes: the oil-control oil-feed port for being set to the inner sidewall of valve seat；By valve seat
The oil-control chamber that the upper surface of the bottom surface and valve rod towards valve rod of inner sidewall, valve seat limits；Throttling through valve seat setting is logical
Road.Stem lift setting member is provided in oil-control chamber, which is provided with the axis direction row along fuel injector
Into through-hole.The stem lift setting member, which is provided with from an axial side of stem lift setting member, leads to its opposite another axial direction
At least one oil-control channel of side, to constitute a part in oil-control path.Oil-control channel is along the axis perpendicular to fuel injector
The total sectional area on any section that direction obtains is cut not less than what oil-control chamber oil-feed port obtained at the inner sidewall of the valve seat
Area.When valve rod is in top dead centre, the upper and lower end face of stem lift setting member bears against bottom surface and valve rod in valve seat
On upper surface, the other end that one end of through-hole is aligned with throttling passage and its is opposite is closed by the upper surface of valve rod.
One aspect according to the present utility model, the cross-sectional area of through-hole are not less than the smallest cross-section area of throttling passage.
Preferably, the shape of through-hole is consistent with shape of the throttling passage at bottom surface.
Another aspect according to the present utility model, the diameter of oil-control channel source automatic control oil pocket are straight with stem lift setting member
The difference of diameter.
One embodiment according to the present utility model, the axis direction of the periphery of stem lift setting member perpendicular to fuel injector
Extend outward at least two alar parts.Preferably, this at least two alar part uniformly divides along the circumferencial direction of stem lift setting member
Cloth.
Another embodiment according to the present utility model, oil-control channel by opening in the axial direction on stem lift setting member
If at least one access axially penetrated through is realized.
It is according to the present utility model in another aspect, access be in by around stem lift setting member through-hole be arranged at least one
The form of a hole axially penetrated through.Preferably, which is the groove being arranged on the periphery of stem lift setting member.
One embodiment according to the present utility model, oil-control channel by flat-cut stem lift setting member in the axial direction with
Tangential section is formed to realize, the distance between axis of the tangential section and stem lift setting member is not less than stem lift setting member
Through-hole radius.
Another embodiment according to the present utility model, stem lift setting member is along the section got perpendicular to axis direction
In polygon or with the circle of at least one notch.
The one side of above-described embodiment according to the present utility model, when cross sectional shape is the circle at least two notches
When, notch is symmetrical around the through-hole of stem lift setting member and is evenly distributed；When cross sectional shape is polygon, polygon is
Equilateral polygon.
Another embodiment according to the present utility model, when the bottom surface of valve seat is plane, stem lift setting member is at least
Boss is provided on one axial side.Boss is provided with boss through-hole, the axis of boss through-hole and leading to for stem lift setting member
The axis in hole is conllinear.Preferably, boss through-hole is identical in diametrically size as the through-hole of stem lift setting member.
By using the high pressure common rail injector provided by the utility model for diesel engine, realization valve rod can be reduced
The number of parts of lift settings function, and ensure when valve rod is in maximum lift point, oil-control path is truncated, avoids the energy unrestrained
Take, while reducing influence of " cavitation corrosion " phenomenon for fuel injector, to extend the service life of fuel injector.
Detailed description of the invention
Fig. 1 is the schematic cross-section that a kind of fuel injector is in nozzle closed state according to prior art；
Fig. 2 is the partial enlargement diagram of the jet side of fuel injector shown in FIG. 1, and it clearly shows stop in lower
The stem lift control assembly of point；
Fig. 3 is the schematic cross-section that fuel injector shown in FIG. 1 is in nozzle opening state；
Fig. 4 is the partial enlargement diagram of the jet side of fuel injector shown in Fig. 3, and it clearly shows stop in upper
The stem lift control assembly of point；
Fig. 5 and Fig. 6 is the schematic cross-section of fuel injector according to the present utility model, wherein respectively illustrates to be in and close
The jet of conjunction state and opening state；
Fig. 7 is the partial enlargement diagram of the ball valve side of fuel injector shown in Fig. 5, and it illustrates at lower dead center
Stem lift setting member；
Fig. 8 is the partial enlargement diagram of the ball valve side of fuel injector shown in Fig. 6, and it illustrates at top dead centre
Stem lift setting member；
Fig. 9 is the partial enlargement diagram of the jet side of fuel injector shown in Fig. 5, and it illustrates be in closed state
Jet；
Figure 10 is the partial enlargement diagram of the jet side of fuel injector shown in Fig. 6, and it illustrates be in open shape
The jet of state；
Figure 11 a shows the stem lift setting member used in fuel injector according to the present utility model in a top view
A kind of embodiment；
Figure 11 b is the sectional view for the stem lift setting member that the line A-A in Figure 11 a is obtained；
Figure 12-14 respectively illustrates its of the stem lift setting member used in fuel injector according to the present utility model
Its embodiment.
Specific embodiment
It is described in more detail below with reference to content of the embodiment to the utility model.In the accompanying drawings, similar attached
Icon note refers to similar component.
Firstly, the fuel injector of -4 pairs of prior arts is illustrated referring to Fig.1.
Used fuel injector 8 generally includes elongated shell 81 in the market now, is provided with ball valve in the shell 81
82.Ball valve 82 includes that (as shown in fig. 1, valve seat 822 is one of the neighbouring valve ball 821 of shell 81 for valve ball 821 and valve seat 822
Point).Valve ball 821 is disposed adjacent with the electromagnetic assembly 83 of fuel injector 8.Shell 81 is equipped with oil-feed port 84.Height from high-pressure common rail
Compression ignition oil is fed into two oil circuits of fuel injector 8 via the oil-feed port 84, i.e. oil-control path and oil spout path.Oil spout path
The jet 86 of fuel injector 8 is extended to via fuel injection chamber 85 from oil-feed port 84.Oil-control path is from oil-feed port 84 via oil-control
Chamber 87 extends to the throttling passage 822c being arranged in valve seat 822, then returns in fuel tank along drainback passage.
Fuel injector 8 is additionally provided with valve rod 88.The upper end of the separate jet 86 of valve rod 88 by valve seat 822 to be surrounded
Mode is arranged, and in other words, works in the cylinder body being made of valve seat 822.Upper surface 88us, the valve of the upper end of the valve rod 88
The medial surface of the composition cylinder body of the bottom surface 822b and valve seat 822 in face of valve rod 88 of seat 822 limits above-mentioned oil-control chamber jointly
87 (referring to Fig. 1 and Fig. 3).Fuel injection chamber 85 is run through in the lower end in face of jet 86 of valve rod 88.It is inactive in electromagnetic assembly 83
In the case where, valve ball 821 blocks the upper channel mouth of the throttling passage 822c in valve seat 822, so that drainback passage and oil-control
Chamber 87 is isolated entirely from.In the case, the conjunction of the spring force on valve rod 88 and the hydraulic coupling at oil-control chamber 87 is acted on
Power is greater than the hydraulic coupling at fuel injection chamber 85, to make jet 86 always in closed state (as shown in Figures 1 and 2).
In the case where electromagnetic assembly 83 starts, ball valve 82 causes valve under the action of from the magnetic force of electromagnetic assembly 83
Ball 821 is disengaged (as shown in Figure 3) with valve seat 822, so that the high pressure fuel from oil-feed port 84 be enable to exist along setting
Throttling passage 822c flowing in valve seat 822 is flowed into high pressure fuel from oil-control chamber 87 and returning in shell 81 is arranged in
In oily channel, and finally it flow back into fuel tank.Compared with when electromagnetic assembly 83 is inactive the case where, this inevitably results in oil-control chamber
Pressure decline in 87.At this point, pressure in fuel injection chamber 85 with the pressure decline in oil-control chamber 87 and increasingly greater than oil-control chamber
Pressure in 87, so as to cause the pressure difference suffered by the both ends of valve rod 88 increase due to it is mobile far from jet 86, then make
Originally the jet 86 that is blocked by valve rod 88 is in the open state, and thus by high pressure fuel via the jet 86 controllably
It is ejected into the combustion chamber of diesel engine.
In the fuel injector 8 of the prior art, valve rod 88 pumps (shown in referring to Figure 1 and Figure 3) by valve rod
Caused by 88 both ends pressure difference, as described above.Obviously, the lift size of valve rod 88 determines the jet of fuel injector 8
86 aperture then significantly affects the distributive value sprayed via the jet 86.The lift of the valve rod 88 is specifically by valve rod liter
Process control component 800 is realized.It is nested on valve rod 88 with Fig. 4, the stem lift control assembly 800 referring to fig. 2, is in oil spout
In chamber 85.When valve rod 88 blocks jet 86, that is, reach the down stroke position of stem lift control assembly 800.Thus, it should
The down stroke position of stem lift control assembly 800 is fixed relative to valve rod 88.In example shown in figures 1-4, valve
Bar lift control assembly 800 is shown as being arranged on the flange 88t being integrally formed with valve rod 88.The stem lift control assembly
800 are made of the essentially negligible material of incompressible or decrement comprising the lift being nested on valve rod 88 is set
Determine part 801 and baffle 802 (as shown in figs. 2 and 4).In the form of sleeve, spring is nested in the liter lift settings part 801
The outside of journey setting member this spring force and acts on the hydraulic of 88 top of valve rod to provide downward spring force to valve rod 88
Power resists system pressure jointly, so that valve rod 88 be made to block jet 86.Baffle 802 substantially annular in shape is with such as screw thread
The mode well known in the art of connection etc is fixed between the upper housing 811 of shell 81 and lower case 812.Lift settings part
801 along the axis direction of fuel injector 8 thickness determine valve rod 88 expection lift size, therefore, by replacement have not
The adjusting of the expection lift for valve rod 88 may be implemented in the lift settings part 801 of stack pile.Specifically, referring to Fig. 3 and figure
4, when valve rod 88 is moved up because of the pressure reduction in oil-control chamber 87, it is nested with the stem lift control assembly 800 on valve rod 88
Because flange 88t on valve rod 88 there are due to concurrently move up, when the upper end of lift settings part 801 is abutted with baffle 802,
The barrier effect of baffle 802 makes the lift settings part 801 reach its top dead centre (that is, maximum lift point), to restrain valve
Thus the further upward stroke (referring to fig. 4) of bar 88 reaches the top dead centre of valve rod 88 simultaneously.Obviously, this construction causes
It realizes that number of components involved in stem lift set-up function is relatively more, so as to cause relatively high manufacturing cost and is assembled into
This.
Furthermore this construction of the stem lift assignment component 800 causes when valve rod 88 is in top dead centre, due to valve seat
The 822 bottom surface 822b in face of valve rod 88 be not in contact with the upper surface 88us of valve rod 88 (referring to Fig. 3, bottom surface 822b with it is upper
Still there is gap delta between the 88us of end face), although being in its top dead centre so as to cause valve rod 88, oil-control path is still in
Opening state.This gap delta is difficult to eliminate by mach mode in actual operation, so as to cause being difficult to realize control
Oil circuit footpath it is completely cut off.In this case, in the entire stroke of valve rod 88, high pressure fuel is had always and passes through confession
Hydraulic fluid port 84 flows in drainback passage via oil-control chamber 87 and throttling passage 822c, thus cause " cavitation corrosion " phenomenon it is lasting exist and
The waste of the energy.
In the following, being illustrated in conjunction with Fig. 5-10 pairs of fuel injectors 1 provided by the utility model.
Referring to figs. 5 and 6, fuel injector 1 includes elongated shell 11.Ball valve 12 is provided in the shell 11.Ball valve 12 wraps
Include valve ball 121 and valve seat 122.In fig. 5 and fig., valve seat 122 is shown as to a part of shell 11.It is understood that
The valve seat 122 can be separately provided relative to shell 11.Valve ball 121 is disposed adjacent with the electromagnetic assembly 13 of fuel injector 1.Ball valve
12 valve seat 122 is equipped with oil-feed port 14 in wall 122o on the outside.High pressure fuel from high-pressure common rail is by via the oil-feed port
14 are supplied in two oil circuits of fuel injector 1, that is, oil-control path and oil spout path.The fuel oil in oil spout path is flowed through from oil-feed port
14 flow to fuel injection chamber 15 via the fuel injection chamber oil-feed port 14p on the inner wall that shell 11 is arranged in, and then along it is as shown in the figure for
Under direction flow to the jet 16 of fuel injector 1.The fuel oil in oil-control path is flowed through from oil-feed port 14 via valve seat 122 is arranged in
Oil-control chamber oil-feed port 14k on inner wall 122i flows to oil-control chamber 17, and flows through and set in the case where ball valve 12 is in the open state
Set the throttling passage 122c in valve seat 122, and after finally flow back into fuel tank through drainback passage.
Fuel injector 1 is additionally provided with valve rod 18, as shown in Fig. 5,6,9 and 10.The upper end of the separate jet 16 of valve rod 18
Portion is arranged in a manner of being surrounded by valve seat 122, in other words, works in the cylinder body being made of valve seat 122.The valve rod 18
The upper surface 18us of upper end, valve seat 122 the bottom surface 122b and valve seat 122 in face of valve rod 18 composition cylinder body medial surface
122i limits above-mentioned oil-control chamber 17 jointly.Fuel injection chamber 15 is run through in the lower end in face of jet 16 of valve rod 18.In electromagnetism group
In the case that part 13 is inactive, as shown in Fig. 5 and Fig. 7, valve ball 121 blocks the throttling passage 122c in valve seat 122, so that
Drainback passage is isolated entirely from oil-control chamber 17.In this case, the hydraulic coupling at oil-control chamber 17 and by being nested with
So that valve rod 18 is resisted the external system pressure of fuel injector 1 in the spring force that the spring 19 on valve rod 18 acts on valve rod 18 and seals
Jet 16 is blocked, so that it is guaranteed that jet 16 is in closed state.
In the case where electromagnetic assembly 13 starts, as shown in Fig. 6 and Fig. 8, valve ball 121 is in the magnetic from electromagnetic assembly 13
Valve seat 122 is moved away under the action of power, to enable the high pressure fuel from oil-feed port 14 along setting in valve seat 122
Throttling passage 122c flowing, so that high pressure fuel is flowed into drainback passage from oil-control chamber 17, and finally flow back into fuel tank.
Compared with the case where when Fig. 5 and inactive electromagnetic assembly shown in fig. 7 13, under this will lead to the pressure in oil-control chamber 17 gradually
Drop.As a result, as the pressure in oil-control chamber 17 is gradually reduced, the pressure in fuel injection chamber 15 is increasingly greater than the pressure in oil-control chamber 17
Power moves away from jet 16 because of upper end and the increase of pressure difference suffered by lower end so as to cause valve rod 18, thus
Valve rod 18 no longer blocks jet 16, so that high pressure fuel to be controllably ejected into the combustion chamber of diesel engine via jet 16
In.
In fuel injector 1 according to the present utility model, especially in oil-control chamber 17, it is provided with stem lift setting member
100, for the lift of regulating valve stem 18, then realize the purpose of the aperture of control jet 16.It should be noted that herein
Used in term " diameter of stem lift setting member " " diameter of valve rod " and " diameter of oil-control chamber " refer to accordingly
Component is in its diameter of section in the section of the axis direction of fuel injector 1.
In embodiment as shown in fig. 8, stem lift setting member 100 includes roughly cylindrical ontology 1001.It should
Stem lift setting member 100 is provided with the through-hole 1002 for running through the ontology 1001 traveling along the axis direction of fuel injector 1.Although figure
It is middle to be shown as the through-hole 1002 to be centrally located the ontology 1001 in the stem lift setting member 100, it is understood that, lead to
The arrangement that hole is centrally located is not required in that, as long as stem lift setting member 100 is in assembled state, through-hole
1002 can be aligned with throttling passage 122c.The cross-sectional area of the through-hole 1002 is no less than the minimum of throttling passage 122c
Cross-sectional area.Preferably, the shape of through-hole 1002 is consistent with shape of the throttling passage 122c at the 122b of bottom surface.Stem lift is set
The thickness for determining the axis direction along fuel injector 1 of part 100 depends on the expection maximum lift of valve rod 18.In other words, thickness etc.
In maximum distance and valve between the upper surface 18us of valve rod 18 and the bottom surface 122b of valve seat 122 in assembled state
The difference of the expection maximum lift of bar 18.In the present embodiment, the diameter of stem lift setting member 100 is slightly less than the straight of oil-control chamber 17
Thus diameter forms oil-control channel, to constitute oil-control path between stem lift setting member 100 and the inner wall of oil-control chamber 17
A part.Preferably, the difference of the diameter of the diameter of oil-control chamber 17 and stem lift setting member 100 is greater than or equal to oil-control chamber fuel feeding
The diameter of mouth 14k.
Fig. 9 and Figure 10 is the amplification schematic cross-section of the jet side of fuel injector 1 according to the present utility model, is shown respectively
Go out in closed state and the jet of opening state 16.The shell 11 of fuel injector 1 includes upper housing 111 and lower case 112.
The diameter for the cylinder body that upper housing 111 is formed is smaller than the diameter for the cylinder body that lower case 112 is formed, to form cylinder body flange 11t.Bullet
Spring 19 is nested on valve rod 18, and upper and lower side bears against the flange 18t of cylinder body flange 11t and valve rod 18.
Below with reference to stem lift setting member used in the fuel injector 1 of Figure 11 a, 11b and 12-14 to the utility model into
Row further instruction.
The reality as shown in Figure 11 a and Figure 11 b of the stem lift setting member used in the fuel injector 1 of the utility model
It applies in example 110, stem lift setting member 110 includes that ontology 1101 and the axis direction through ontology 1101 along fuel injector 1 extend
Through-hole 1102.The periphery of ontology 1101 can extend radially out at least two alar parts 1103 and (schematically show in Figure 11 a
Go out three), and the diameter of circumference that the outer end of the separate ontology 1101 of these alar parts 1103 is constituted is equal to or slightly less than
The diameter of cylinder body.As those skilled in the art can recognize, the quantity of the alar part can be 2,3,4,5
Or even more.Each of these alar parts 1103 can be for any thickness δt(in the section transverse to axis direction
The thickness of acquisition) plate, thickness δtIt can be along the direction (that is, radial direction of fuel injector 1) far from through-hole 1102 constant
Constant (as shown in fig. 11a), be also possible to variation, such as become larger or become smaller, first becoming larger becomes smaller afterwards or first becomes smaller
After become larger.Although as being in fig. 11 a illustrated as the thickness of each alar part 1103, it is preferred arrangement, this
Field technical staff it will be appreciated that its respective thickness equally can be it is different.Preferably, these 1103 edges of alar part
The circumferencial direction of the ontology 1101 is evenly distributed.Space between two at least adjacent alar parts 1103 constitutes oil-control path
At least part.Wherein, these alar parts 1103 can be with ontology 1101 in the direction along the thickness of the axis direction of fuel injector 1
Thickness is equal.Institute is it should be noted that in assembly, it should be ensured that alar part 1103 does not block oil-control chamber oil-feed port 14k.So
Preferably, alar part 1103 is less than the thickness of ontology 1101 in the direction along the thickness of the axis direction, and in assembled state
Alar part 1103 separate jet 16 edge and the edge of the separate jet 16 of ontology 1101 it is not concordant, edge away from
From the distance between the bottom surface 122b that should be greater than oil-control chamber oil-feed port 14k Yu valve seat 122.
Figure 12 shows another embodiment of stem lift setting member 120 according to the present utility model.Stem lift setting
Part 120 includes ontology 1201 and through-hole 1202.The set-up mode of through-hole 1202 is similar with the set-up mode of aforementioned through-hole 1102.With
Unlike stem lift setting member 101, stem lift setting member 120 and not set alar part, but be provided with along fuel injector 1
At least one perforative oil-control channel 1203 that axis direction is advanced, for allowing high pressure fuel to flow there through.All controls
Oily channel 1203 is no less than oil-control chamber oil-feed port 14k in valve in the total sectional area in the section obtained perpendicular to axis direction
Sectional area at the inner sidewall 122i of seat 122.
The oil-control channel 1203 may be disposed at any position of stem lift setting member 120.For example, at least one oil-control
Channel 1203 can be axially penetrated through at least one that the through-hole 1202 around the stem lift setting member 120 opens up in the axial direction
Hole form.The cross sectional shape of each hole can be arbitrary shape, such as circle, polygon, ellipse etc..
Preferably, which may be disposed at the periphery (as shown in Figure 12) of stem lift setting member 120.Extremely
A few oil-control channel 1203 can be in open up at least one axis along the axis direction on the periphery of the stem lift setting member 120
To the form of perforative groove.The cross sectional shape of each groove can be arbitrary shape, such as crescent, triangle etc..
The quantity in the oil-control channel 1203 can be to be any number of, and when the quantity is greater than 2, the oil-control channel 1203 is preferably
It is symmetrical around through-hole 1202 and equably arrange.
Alternatively, the setting in oil-control channel 1203 can be by changing the cross sectional shape of stem lift setting member 120 come real
It is existing.That is the cross sectional shape of the stem lift setting member 120 can be set to polygon, each side of polygon and valve
The channel formed between the inner sidewall 122i of seat 122 can be used as above-mentioned oil-control channel 1203.
Alternatively, tangential section can be had to be formed along the axis direction flat-cut stem lift setting member 100 of fuel injector 1
1303 stem lift setting member 130, referring to Figure 13.Stem lift setting member 130 includes ontology 1301 and through-hole 1302.Through-hole
1302 set-up mode is similar with the set-up mode of aforementioned through-hole 1102,1202.The tangential section 1303 and stem lift setting member
The distance between 130 axis is not less than the radius of through-hole 1302.As a result, when stem lift setting member 130 is placed in valve seat
When in 122, the same work for playing aforementioned oil-control channel in space between the tangential section 1303 and the inner sidewall 122i of valve seat 122
With.
Figure 14 shows another embodiment 140 of stem lift setting member used in fuel injector 1.Stem lift setting member
140 include ontology 1401 and through-hole 1402.The set-up mode of through-hole 1402 is set with aforementioned through-hole 1002,1102,1202,1302
It is similar to set mode.The set-up mode in its oil-control channel equally can be similar to stem lift setting member 100,110,120 and 130.Institute
The difference is that may be provided with boss 1403 at least one axial side of stem lift setting member 140, the boss 1403
It is provided with boss through-hole 1404.The axis of the through-hole 1402 of the axis and stem lift setting member 140 of the boss through-hole 1404 can
To be conllinear.Preferably, boss through-hole 1404 is identical as the diameter of through-hole 1402 of stem lift setting member 140.It is convex
Thickness of the platform 1403 on the axis direction of fuel injector 1 can be invariable (as shown in Figure 14) or towards ontology
1401 periphery gradually becomes smaller.The purpose that boss 1403 is arranged is, when valve rod 18 is in stroke top dead center, that is, when valve rod liter
When the upper surface 18us of the bottom surface 122b and valve rod 18 of journey setting member 140 and valve seat 122 are contacted simultaneously, in stem lift setting member
There is the region not being in contact with bottom surface 122b and/or upper surface 18us in the outer circumferential area of the axial side of at least one of 140, from
And ensures the high pressure fuel being flowed into oil-control chamber 17 via oil-control chamber oil-feed port 14k and directly apply or set by means of stem lift
Determine pressure that part 140 is applied to indirectly on the upper surface 18us of valve rod 18 and have to be enough to push valve rod 18 mobile towards jet 16
A possibility that.Certainly, in the case where that can ensure the pressure, for example, bottom surface 122b and it is non-planar in the case where, can omit
Fall the boss 1403.
It is above-mentioned although above having been combined specific embodiment the technical solution of the utility model is described
Specific embodiment is merely exemplary, and and unrestricted.Those skilled in the art without departing substantially from the utility model by institute
It is contemplated that making a variety of improvement and change to disclosed specific embodiment in the case where attached claim limited range
Type.Such as.It is possible by combining the feature of one embodiment description to be integrated in another embodiment.
Claims (10)
1. a kind of high pressure common rail injector (1) for diesel engine, the fuel injector (1) include:
Shell (11)；
Valve rod (18), the valve rod are arranged in the shell；
Ball valve (12), the ball valve is arranged in the shell and the valve seat of the upper end including surrounding the valve rod (18)
(122), the shell, the valve seat and the valve rod limit oil-control path jointly, and the oil-control path includes: to be set to institute
State the oil-control oil-feed port (14k) of the inner sidewall (122i) of valve seat；By the inner sidewall of the valve seat, the valve seat towards the valve
The oil-control chamber (17) that the bottom surface (122b) of bar and the upper surface (18us) of the valve rod limit；Through the section of valve seat setting
Circulation road (122c),
It is characterized in that,
Stem lift setting member (100,110,120,130,140) are provided in the oil-control chamber (17),
The stem lift setting member be provided with along the fuel injector axis direction traveling through-hole (1002,1102,1202,
1302,1402),
The stem lift setting member, which is provided with from an axial side of the stem lift setting member, leads to its opposite another axis
To at least one oil-control channel of side, to constitute a part in the oil-control path, the oil-control channel is along perpendicular to institute
The total sectional area stated on any section of the axis direction acquisition of fuel injector (1) exists not less than the oil-control chamber oil-feed port (14k)
The sectional area obtained at the inner sidewall (122i) of the valve seat (122),
When the valve rod (18) is in top dead centre, the upper surface and lower end surface of the stem lift setting member are born against in institute
It states on the bottom surface (122b) of valve seat (122) and the upper surface (18us) of the valve rod (18), one end of the through-hole and institute
It states throttling passage (122c) alignment and its opposite other end is closed by the upper surface of the valve rod.
2. high pressure common rail injector according to claim 1, which is characterized in that the cross-sectional area of the through-hole is not less than institute
State the smallest cross-section area of throttling passage (122c), it is preferable that the shape of the through-hole and the throttling passage (122c) are in institute
The shape at bottom surface (122b) is stated to be consistent.
3. high pressure common rail injector according to claim 1 or 2, which is characterized in that the oil-control channel is originated from the control
The difference of the diameter of the diameter of oil pocket (17) and the stem lift setting member (100,110,120,130,140).
4. high pressure common rail injector according to claim 3, which is characterized in that hang down the periphery of the stem lift setting member
At least two alar parts (1103) directly are extended outward in the axis direction of the fuel injector (1), it is preferable that at least two wing
Portion (1103) is uniformly distributed along the circumferencial direction of the stem lift setting member, and the thickness of each alar part (1103) is along separate
The direction of the through-hole (1102) of the lift settings part is invariable or variation.
5. high pressure common rail injector according to claim 1 or 2, which is characterized in that the oil-control channel passes through described
The access that at least one is axially penetrated through is opened up to realize along the axis direction on stem lift setting member.
6. high pressure common rail injector according to claim 5, which is characterized in that the access is in be surrounded the valve rod liter
The form of at least one hole axially penetrated through of the through-hole setting of journey setting member, it is preferable that the hole is that setting exists
Groove (1203) on the periphery of the stem lift setting member.
7. high pressure common rail injector according to claim 5, which is characterized in that the oil-control channel passes through along the axis
Stem lift setting member described in the flat-cut of direction is to form tangential section (1303) Lai Shixian, the tangential section (1303) and the valve rod
Radius of the distance between the axis of lift settings part not less than the through-hole (1302) of the stem lift setting member.
8. high pressure common rail injector according to claim 1 or 2, which is characterized in that the stem lift setting member is along vertical
Directly in the section that the axis direction is got in polygon or with the circle of at least one notch.
9. high pressure common rail injector according to claim 8, which is characterized in that
When the cross sectional shape is the circle at least two notches, the notch is around the stem lift setting member
Through-hole is symmetrical and is evenly distributed；
When the cross sectional shape is polygon, the polygon is equilateral polygon.
10. high pressure common rail injector according to claim 1 or 2, which is characterized in that described when the valve seat (122)
When bottom surface (122b) is plane, at least one of the stem lift setting member is provided with boss (1403) on axial side, described
Boss is provided with boss through-hole (1404), the axis of the boss through-hole (1404) and the stem lift setting member (140)
The axis of through-hole (1402) is conllinear, it is preferable that the boss through-hole (1404) and the stem lift setting member (140)
Through-hole (1402) is identical in diametrically size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821688238.8U CN208918729U (en) | 2018-10-18 | 2018-10-18 | High pressure common rail injector for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821688238.8U CN208918729U (en) | 2018-10-18 | 2018-10-18 | High pressure common rail injector for diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208918729U true CN208918729U (en) | 2019-05-31 |
Family
ID=66709612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821688238.8U Active CN208918729U (en) | 2018-10-18 | 2018-10-18 | High pressure common rail injector for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208918729U (en) |
-
2018
- 2018-10-18 CN CN201821688238.8U patent/CN208918729U/en active Active
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