CN208184873U - A kind of diesel engine super-pressure vehicle fuel pump structure - Google Patents
A kind of diesel engine super-pressure vehicle fuel pump structure Download PDFInfo
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- CN208184873U CN208184873U CN201820664913.7U CN201820664913U CN208184873U CN 208184873 U CN208184873 U CN 208184873U CN 201820664913 U CN201820664913 U CN 201820664913U CN 208184873 U CN208184873 U CN 208184873U
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Abstract
A kind of diesel engine super-pressure vehicle fuel pump structure, including plunger, the pump housing, working cylinder duct, pressure transmission oil cylinder duct, free-piston, annular lubricant oil groove, oil duct and into lubricating oil check valve, wherein the one end in pressure transmission oil cylinder duct is run through with pump chamber, and free-piston is in pressure transmission oil cylinder duct；Pressure transmission oil cylinder duct is separated into the lubricant reservoir of the pressure transmission chamber and the free-piston other end between free-piston one end and pump chamber by free-piston；One end of oil duct is connected to lubricant reservoir, the other end is connected with annular lubricant oil groove；Structure fabrication process is good for this, is easily worked, pressure transmission oil cylinder duct can be effectively ensured machining accuracy improves production efficiency, reduces manufacturing cost, realizes no fuel oil or water leakage, pump oil pressure reach 2500bar or more；The lubrication for effectively guaranteeing plunger avoids plunger from contacting with the direct of cylinder holes road, overcomes the wear problem of plunger Yu working cylinder duct, improve functional reliability and working life.
Description
Technical field
The utility model relates to diesel engine high-pressure fuel pump, the super-pressure vehicle fuel pump structure of specially a kind of diesel engine belongs to
In machinery field.
Background technique
Diesel engine is widely used engine, to adapt to increasingly severeer emission regulation and reducing fuel consumption rate
It is required that and the low viscosities alternative fuel such as dimethyl ether fuel, methanol the market demand, diesel engine need to spray pressure it is higher and
It is suitble to a kind of diesel engine super-pressure fuel oil structure of injection low viscosity alternative fuel.
The Electrocontrolled high-pressure injection system of existing diesel is all using plunger type high-pressure fuel pump, the plunger of high pressure fuel pump
By diesel fuel lubricity and sealing, the method for solving leakage is in the column cooperated with plunger for the microgap being slidably matched with plunger bushing
An annular release oil-recovery tank is opened on the hole wall in plug sleeve hole, and the diesel oil of leakage is made to flow back to fuel tank through back oil road from oil-recovery tank；Between
Gap intermediate fuel oil leakage rate is improved with pump oil pressure to be increased, and serious fuel leakage leads to the superelevation for being difficult to set up 2000bar or more
Fuel pressure, current high pressure fuel pump pump oil pressure reach the seldom of 2000bar in 1600~1800bar range.
To meet the requirement for reducing oil consumption and reducing discharge, diesel engine needs to further increase fuel-injected pressure, but
Quantity of fuel leakage increases with pressure rise, and high pressure fuel pump fuel oil excessive leakage causes to be difficult to set up super-pressure fuel pressure
Problem is always the technical problem during diesel engine high-pressure fuel injection system is developed；
As described above, being slidably matched between the plunger and plunger bushing of the plunger type high-pressure fuel pump that existing diesel uses
By diesel fuel lubricity and sealing, when spraying the low viscosities alternative fuel such as dimethyl ether and methanol, the liquid viscosity of dimethyl ether and methanol
(respectively 0.15mm2/ s and 0.6mm2/ s) than liquid viscosity (3~8mm of diesel oil2/ s) it is much smaller, plunger and plunger bushing are quickly
With regard to wear-out failure, lubrication and the sealing of plunger are also that the low viscosities alternative fuel such as DME Used in Diesel Engines, methanol need to solve
Technical problem.
The utility model patent of the applicant, Patent No. ZL 20,062 0127615.1, entitled " pluralities of fuel
Diesel injection pump " using opened on plunger bushing oil groove high-tension lubrication oil seal and lubrication plunger and plunger bushing between
Gap, the oil suction of plunger downlink and the oil cylinder internal combustion of plunger top surface when uplink pump oil due to the plunger pump of diesel electric-controlled injection system
Oil pressure constantly increases and reduces variation, and the pressure difference of alternation variation is more than 1600bar；The extreme pressure lubricant oil pressure of constant pressure, which is higher than, to be become
Lubricating oil enters fuel oil and burn oil occurs, block up the problem of nozzle opening of atomizer when the fuel oil oil pressure of change；Lubricating Oil force down in
When the fuel oil oil pressure of variation, the low-viscosity fuels such as dimethyl ether enter plunger and plunger bushing fit clearance, the column of precision-fit occur
Fill in surface and the abrasion of plunger bushing internal surface of hole and fuel leakage problem.
The patent of invention of the applicant, " the low pressure difference hydraulic sealing type high pressure of Patent No. ZL 201,010 5 27308.3
Common rail fuel pump " it provides and so that plunger is slidably matched the lubricating oil in gap using the structure of minute-pressure difference limen, Simultaneous Pressure lifting
It remains a small pressure difference higher than operating cylinder oil pressure, fuel oil is prevented to enter the structure of fit clearance, effectively overcome
The problem of present existing lubrication of high-pressure plunger pump is with sealing.But structure is more complex, volume is big, is difficult to pacify on existing diesel
Dress uses, and consumable material is more, high-precision part is more, manufacturing cost is higher.
The patent of invention of the applicant, Patent No. ZL201110217136.4 " a kind of super-high-pressure plunger pump plunger
Sealing lubrication structure ", the previous patent of invention of the applicant (ZL 2,010 105 27308.3) " low pressure difference hydraulic sealing is omitted
Formula high-pressure common-rail fuel pump " 9 elements, reduce more than one piece high-precision part, reduce the volume of pump and the consumption of raw material,
Manufacturing cost is reduced, and still keeps original repertoire；Using patent of invention ZL201110217136.4, " one kind is super
The sealing lubrication structure of high-pressure plunger pump plunger " trial production single cylinder diesel pluralities of fuel injection pump, open and inspect four pumps, discovery
Be connected with three oil canals 5.5 end in pressure transmission oil cylinder duct 5 at end of pressure transmission oil cylinder duct 5 shows taper, and taper is big, more leans on
Nearly connecting pin diameter is smaller；As shown in Fig. 4, the reason of this quality problems occur is: need to be when processing pressure transmission oil cylinder duct 5
Fabrication hole 17.1 is first beaten in one end that pressure transmission oil cylinder duct 5 is connected to oil duct 5.3, processes the cutter in pressure transmission oil cylinder duct 5 from technique
The processing pressure transmission oil cylinder duct 5 downwards of hole 17.1, and the conical surface that the head of cutter is small because abrasion is formed, with the increase of processing times,
Tool nose abrasion increases, and leads to the cone of the hole wall in 5.5 connecting pin pressure transmission oil cylinder duct 5 of pressure transmission oil cylinder duct 5 and three oil canals
Degree increases, aperture becomes smaller；To guarantee that free-piston 4 is freely slidable and guarantee leakproofness in pressure transmission oil har opening 5, between cooperation
Gap should control within the scope of 0.0015~0.0025mm, want according to plunger and barrel assembly of diesel engine oil injection pump technical conditions JB/T7173.1
It seeks free-piston 4 and the circularity in pressure transmission oil cylinder duct 5 should reach 0.0005mm, taper should be less than 20: 0.0006mm；Using this Shen
Ask someone former patent of invention ZL2011102171364 " a kind of sealing lubrication structure of super-high-pressure plunger pump plunger " production diesel engine it is more
Kind fuel injection pumps product, and work in-process is in order to guarantee that the taper in pressure transmission oil cylinder duct meets the requirement of national Specification, only
The cutter of head abrasion can be constantly replaced, that there are the diameter dimensions in pressure transmission oil cylinder at high cost, being processed duct 5 is unstable,
The low problem of production efficiency.
Summary of the invention
The purpose of the utility model is to overcome original inventions using above-mentioned the applicant, Patent No.
A kind of diesel engine high-pressure fuel pump of " sealing lubrication structure of super-high-pressure plunger pump plunger " production of ZL201110217136.4,
Because pressure transmission oil cylinder 5 lower end " lubricant reservoir 5.1 is unidirectional with ring packing oil groove 6 and into lubricating oil respectively through three oil canals 5.5
The labyrinth of the connection of valve 7 ", leads to the pressure transmission oil cylinder duct 5 for being difficult to guarantee 5.5 connecting end of pressure transmission oil cylinder duct 5 and three oil canals
Hole wall the high problem of machining accuracy, manufacturing cost, provide a kind of structure it is simpler, it is easy to manufacture, be easily guaranteed that processing essence
Degree, manufacturing cost is low, the lubrication of plunger can still be effectively ensured with sealing, pump oil pressure, and to reach 2500bar or more, burning more
Kind of fuel, functional reliability be good, a kind of plunger long working life diesel engine super-pressure vehicle fuel pump structure.
To realize above-mentioned the purpose of this utility model, the applicant is to my former patent of invention ZL201110217136.4
A kind of " sealing lubrication structure of super-high-pressure plunger pump plunger " further progress " element relationship change ", the wound of " omitting elements "
Newly, a kind of diesel engine super-pressure vehicle fuel pump structure is invented.
The utility model adopts the following technical solution:
A kind of diesel engine super-pressure vehicle fuel pump structure, including plunger 1, the pump housing 2, working cylinder duct 3, pressure transmission oil cylinder duct 5,
Free-piston 4, annular lubricant oil groove 6, oil duct 6.1 and into lubricating oil check valve 7, the wherein one end in pressure transmission oil cylinder duct 5 and pump
Chamber 3.1 runs through, free-piston 4 is in pressure transmission oil cylinder duct 5；Pressure transmission oil cylinder duct 5 is separated into freedom by free-piston 4
The lubricant reservoir 5.1 of 4 other end of pressure transmission chamber 5.2 and free-piston between 4 one end of piston and pump chamber 3.1；One end of oil duct 6.1
It is connected with the connection of lubricant reservoir 5.1, the other end with annular lubricant oil groove 6；
Wherein it is connected into lubricating oil check valve 7 with the annular lubricant oil groove 6；
Wherein pump chamber 3.1 is connected through pressure transmission chamber 5.2 with one end of free-piston 4, and the other end of free-piston 4 is through lubricating oil
Chamber 5.1, oil duct 6.1 are connected with annular lubricant oil groove 6；
A kind of diesel engine super-pressure vehicle fuel pump structure, including plunger 1, the pump housing 2, the working cylinder duct 3 being located in the pump housing 2,
Pressure transmission oil cylinder duct 5, oil duct 6.1 and into lubricating oil check valve 7, the annular lubricant oil groove being located on the hole wall in working cylinder duct 3
6, free-piston 4 is slidably matched in pressure transmission oil cylinder duct 5, with pressure transmission oil har opening 5 in accurate, and the gap that is slidably matched is
0.0015~0.0025 millimeter of annular microgap；Plunger 1 is accurate between working cylinder duct 3 in working cylinder duct 3
Be slidably matched, the gap that is slidably matched is 0.0015~0.0025 millimeter of annular microgap；The upper top surface of plunger 1 and work
The top for making cylinder holes road 3 constitutes pump chamber 3.1, and the annular lubricant oil groove 6 being located on 3 hole wall of working cylinder duct is by plunger 1 and works
Annular microgap between cylinder holes road 3 separates are as follows: the upper plug annular microgap of pump chamber 3.1 is upwardly into from annular lubricant oil groove 6
9, from annular lubricant oil groove 6 to the lower plunger ring shape microgap 10 down toward 3 lower end of working cylinder duct；The one of pressure transmission oil cylinder duct 5
End is run through with pump chamber 3.1, free-piston 4 is in pressure transmission oil cylinder duct 5；The free-piston 4 is by pressure transmission oil cylinder duct 5
Be separated into: the other end of the pressure transmission chamber 5.2 and free-piston 4 that are formed between one end and pump chamber 3.1 of free-piston 4 is lubrication
Oil pocket 5.1；Wherein one end of oil duct 6.1 is connected with the connection of lubricant reservoir 5.1, the other end with annular lubricant oil groove 6；Into lubrication
Oily check valve 7 is connected to annular lubricant oil groove 6；Pump chamber 3.1 is connected through pressure transmission chamber 5.2 with one end of free-piston 4, freely
The other end of piston 4 is connected to through lubricant reservoir 5.1, oil duct 6.1 with annular lubricant oil groove 6；
During 1 uplink pump oil of plunger, the profit in the annular lubricant oil groove 6 of 9 lower end of upper plug annular microgap is kept
Lubricating oil presses PR1P is pressed with the fuel oil in the pump chamber 3.1 of upper endK1It is equal, PR1=PK1, have in the course of work of 1 uplink pump oil of plunger
Effect the super-pressure fuel oil in pump chamber 3.1 is prevented to enter upper plug annular microgap 9, effectively overcomes super-pressure fuel oil and let out
Leakage problem, to ensure that a kind of diesel engine super-pressure fuel pump generates the super-pressure pump oil pressure of 2500bar or more；Annular
Lubricating oil viscosity in profit oil-way 6 increases with the viscosity that increases of pressure, since lower plunger ring shape microgap 10 is to high viscosity
The effect of shutting off of lubricating oil, only a small amount of lubricating oil leak through lower plunger microgap 10, flow back to lubrication through lubricating oil return pipe 16
Fuel tank, the lubricating oil film in lower plunger ring shape microgap 10 make plunger 1 float in working cylinder duct 3, avoid plunger 1 with
Working cylinder duct 3 directly contacts, and effectively overcomes the wear failure problem of plunger 1 Yu working cylinder duct 3, and improving work can
By property and working life.
The diesel engine super-pressure vehicle fuel pump structure includes plunger, the pump housing, pressure transmission oil cylinder and is mounted in the in-oil cylinder freedom of pressure transmission
Piston；Pressure transmission oil cylinder is divided into pressure transmission chamber and lubricant reservoir by free-piston；Annular lubricant oil groove by plunger and work cylinder holes it
Between annular microgap be divided into from annular lubricant oil groove and be upwardly into the upper plug annular microgap of pump chamber, from annular lubricant oil groove
To the lower plunger ring shape microgap of the lower end down toward working cylinder hole；In plunger uplink pump oil, the fuel oil of the super-pressure in pump chamber
Pressure passes to annular lubricant oil groove through pressure transmission chamber, free-piston, lubricant reservoir, oil duct, makes fuel pressure and annular in pump chamber
Lubricating oil pressure is equal in oil-way；A small amount of lubricating oil is released from annular lubricant oil groove through lower plunger ring shape microgap, is pumped
The effect of chamber intermediate fuel oil pressure, free-piston right lateral supplement the lubrication that annular lubricating oil sump is gushed through lower plunger ring shape microgap
Oil, to keep the fuel pressure in the annular oil-way of upper plug annular microgap lower end in lubricating oil pressure and upper end pump chamber
It is equal, prevent the fuel oil in pump chamber to enter upper plug annular microgap, prevent fuel oil from upper plug annular microgap leak；
Lubricating oil film in lower plunger ring shape microgap make plunger work cylinder holes in float avoid plunger with work cylinder holes directly connect
Touching overcomes the abrasion of plunger and the cylinder holes that works.
Beneficial effect
1, the applicant is to a kind of my former patent of invention ZL201110217136.4 " sealing of super-high-pressure plunger pump plunger
Lubrication system " further progress " element relationship change ", the innovation of " omitting elements ", the oil duct in former patent of invention is omitted
5.3 1 elements, the position for changing element pressure transmission oil cylinder duct 5, the one end in the pressure transmission oil cylinder duct 5 of innovation is passed through with pump chamber 3.1
Logical structure, when processing pressure transmission oil cylinder duct 5, the cutter head portion easy to wear for the cutter for processing pressure transmission oil cylinder duct 5 can be got over
Pressure transmission oil cylinder duct 5 out effectively overcomes the original hair of the applicant to ensure that the machining accuracy in pressure transmission oil cylinder duct 5
Biography is difficult to ensure present in a kind of bright patent ZL201110217136.4 " sealing lubrication structure of super-high-pressure plunger pump plunger "
The problem that machining accuracy, the production efficiency in compressing cylinder duct 5 are low, manufacturing cost is high；The utility model structure is simpler, manufactures work
Skill is good, is easily worked, particularly can effectively guarantee pressure transmission oil cylinder duct 5 machining accuracy improves production efficiency, reduces
Manufacturing cost；
2, after the utility model saves one element of the applicant's original patent of invention, the original invention of the applicant is still kept
A kind of patent ZL201110217136.4 " sealing lubrication structure of super-high-pressure plunger pump plunger " original repertoire:
(1) it realizes no fuel oil or water leakage, pump oil pressure reaches 2500bar or more；
(2) it is effectively guaranteed the lubrication of plunger, avoids directly contacting, overcoming plunger and work for plunger and cylinder holes road
Make the wear problem in cylinder holes road, effectively improve functional reliability and working life；
(3) structure is simpler, manufacturing cost is lower.
The diesel engine super-pressure vehicle fuel pump structure not only increases the pump oil pressure of the high-pressure oil pump of diesel engine, makes pump oil pressure
Power reaches 2500bar or more, and can make diesel engine not only firewood oil can also burn the low-viscosity fuels such as methanol；The diesel engine is super
High pressure fuel pump configuration can also be used in the implementation of super-pressure water pump, chemical liquid high-pressure pump structure.
Detailed description of the invention
A kind of diesel engine super-pressure vehicle fuel pump structure schematic diagram of Fig. 1；
A kind of structural schematic diagram of the diesel engine super-pressure vehicle fuel pump structure embodiment of Fig. 2 in oil suction；
A kind of structural schematic diagram of the diesel engine super-pressure vehicle fuel pump structure embodiment of Fig. 3 in pump oil；
The lower end in the pressure transmission oil cylinder duct in the sealing lubrication structure of Fig. 4 prior art super-high-pressure plunger pump plunger is processing
The middle schematic diagram for generating taper.
Appended drawing reference:
1, plunger；2, the pump housing；3, working cylinder duct；3.1, pump chamber；4, free-piston；5, pressure transmission oil cylinder duct；5.1, moisten
Lubricating cavity；5.2, pressure transmission chamber；5.4, annular microgap；6, annular lubricant oil groove；6.1, oil duct；7, into lubricating oil check valve；8,
Lubricating oil pipe interface；9, upper plug annular microgap；10, lower plunger ring shape microgap；11, in line check valve；12, oil inlet pipe connects
Mouthful；13, oil outlet one-way valve；14, high-pressure oil pipe interface；15, tappet roller component and spring cam driving mechanism；16, lubricating oil
Oil return pipe；17, fabrication hole；18, technique hole plug；19, technique blocks；17.1, fabrication hole；18.1, technique hole plug；5.8,
Pressure transmission oil cylinder duct and three oil canal connecting pins are easy to produce the pressure transmission oil cylinder duct hole wall of processing taper.
Specific embodiment
Specific embodiment of the present utility model is further described with reference to the accompanying drawing.
As shown in Fig. 1, which mainly includes plunger 1, the pump housing 2, the work being located in the pump housing 2
Make cylinder holes road 3, pressure transmission oil cylinder duct 5, oil duct 6.1, into lubricating oil check valve 7, the annular that is located on the hole wall in working cylinder duct 3
Oil-way 6, the free-piston 4 in pressure transmission oil cylinder duct 5；Wherein plunger 1 is in working cylinder duct 3, with working cylinder
It is being slidably matched for precision between duct 3, the annular microgap that the gap that is slidably matched is 0.0015~0.0025 millimeter；Column
The upper top surface of plug 1 and the top in working cylinder duct 3 constitute pump chamber 3.1；The donut-type oil being located on the hole wall in working cylinder duct 3
Slot 6 separates the annular microgap between plunger 1 and working cylinder duct 3 are as follows: is upwardly into pump chamber 3.1 from annular lubricant oil groove 6
Upper plug annular microgap 9, from annular lubricant oil groove 6 to the lower plunger ring shape microgap 10 of the lower end down toward working cylinder hole 3；From
By piston 4 in pressure transmission oil cylinder duct 5, it is slidably matched with pressure transmission oil cylinder duct 5 in accurate, fit clearance is
0.0015~0.0025 millimeter of annular microgap 5.4；One end of pressure transmission oil har opening 5 and pump chamber 3.1 run through, free-piston 4 fills
Be divided into pressure transmission oil cylinder duct 5, by pressure transmission oil cylinder duct 5 pressure transmission chamber 5.2 between free-piston 4 and pump chamber 3.1 and from
By the lubricant reservoir 5.1 of 4 other end of piston；One end of oil duct 6.1 is connected to lubricant reservoir 5.1, the other end and donut-type oil
Slot 6 is connected；It is connected into lubricating oil check valve 7 with annular lubricant oil groove 6；Pump chamber 3.1 is through pressure transmission chamber 5.2 and free-piston 4
One end is connected, the other end of free-piston 4 is connected to through lubricating oil oil pocket 5.1, oil duct 6.1 with annular lubricant oil groove 6.
For the oil duct 6.1 for implementing processing connection lubricant reservoir 5.1 and annular lubricant oil groove 6 in the pump housing 2, set on the pump housing
The fabrication hole 17 that processing oil duct 6.1 is had to is set, and in the nose end regular worker of fabrication hole 17 after being processed into oil duct 6.1
18 closing process hole 17 of skill hole plug blocks 19 in nose end technique for fixing after processing pressure transmission oil cylinder duct 5.
It as shown in Fig. 2, is P by the fuel pressure that fuel pump conveying comes in oil inlet interface tube 121=2bar, lubricating oil pipe
Lubricating oil pressure P in interface 8RIt is the lubricating oil pressure P come from the conveying of diesel lubrication oil ductR, PR=3bar~5bar；When
Pressure when tappet roller component and spring cam driving mechanism 15 drive 1 downlink oil suction of plunger, in pump chamber 3.1 and pressure transmission chamber 5.2
Power PK2For negative pressure, PK2Less than atmospheric pressure P0, P0=1bar, i.e. 0≤PK2≤1bar；Fuel oil is from oil inlet interface tube 12 through oil inlet
Check valve 11 enters in pump chamber 3.1, and lubricating oil is from the warp of lubricating oil pipe interface 8 into lubricating oil check valve 7, annular lubricant at the same time
Oil groove 6, oil duct 6.1 enter lubricant reservoir 5.1, push free-piston 4 to left lateral to its left side and 13 lower end of oil outlet one-way valve
External cylindrical surface contact stop left lateral until, be full of in lubricant reservoir 5.1 at this time lubricating oil, lubricant reservoir 5.1 and oil duct 6.1 and
Oil pressure is P in annular lubricant oil groove 6R, closed into lubricating oil check valve 7；In oil-absorbing process under upper plug annular microgap 9
Hold lubrication pressure PRWith upper end fuel oil oil pressure PK2Maximum differential pressure be Δ P9=PR-PK2；PRFor 3~5bar；0 < PK2≤ 1bar,
PR> PK2, Δ P9≤ 2bar~5bar；The right side of annular microgap 5.4 in oil-absorbing process between free-piston 4 and pressure transmission oil cylinder 5
The lubricating oil oil pressure at end and the fuel oil of left end press pressure differential deltap P5.4=PR-PK2, i.e., 5.4 both ends of annular microgap of free-piston 4 are most
Big pressure differential deltap P5.4=Δ P9, test confirm: 15 millimeters of length, gap be 0.0025 millimeter annular microgap both ends pressure difference
When less than 20bar, lubricating oil in annular microgap is without flow phenomenon, in 1 downlink oil-absorbing process of plunger in annular oil-way 6
Lubricating oil will not flow into pump chamber 3.1 through upper plug annular microgap 9, the lubricating oil in lubricant reservoir 5.1 will not be micro- through annular
Gap 5.4 flows into pressure transmission chamber 5.2；Fuel oil is full of in pump chamber 3.1 when plunger 1 comes downwards to lower dead center, in line check valve 11 closes
It closes.
As shown in Fig. 3, when tappet roller component and spring cam driving mechanism 15 drive 1 uplink pump oil of plunger, pump
Fuel pressure P in chamber 3.1K1It sharply increases, oil outlet one-way valve 13 is opened, and pressure is P in pump chamber 3.1K1Super-pressure fuel oil
Fuel injector is pumped into through oil outlet one-way valve 13, high-pressure oil pipe interface 14 and high-pressure oil pipe；With the super-pressure in same pump chamber 3.1 at this time
Fuel oil presses PK1Annular lubricant oil groove 6, annular lubricant are transmitted to through pressure transmission chamber 5.2, free-piston 4, lubricant reservoir 5.1, oil duct 6.1
The lubrication pressure P of super-pressure in oil groove 6R1Equal to the fuel pressure P of the super-pressure in pump chamber 3.1K1, PR1=PK1, i.e. plunger 1
The profit of super-pressure in the oil-way 6 of the lower end of the upper plug annular microgap 9 being slidably matched between working cylinder duct 3
Lubricating oil pressure is equal with the fuel oil pressure of super-pressure in upper end pump chamber 3.1, and the fuel oil of the super-pressure in pump chamber 3.1 is prevented to enter upper prop
Plug ring type microgap 9 realizes the sealing of the fuel oil for the super-pressure in pump chamber 3.1, makes pump oil pressure up to 2500bar
More than；Super-pressure fuel oil pressure and the right side in the left end pressure transmission chamber 5.2 of annular microgap 5.4 between free-piston 4 and pressure transmission cylinder 5
It holds the super-pressure lubrication pressure in lubricant reservoir 5.1 equal, the fuel oil of super-pressure is prevented to flow into annular microgap 5.4；This reality
With novel the problem of effectively overcoming the fuel leakage in super-pressure pump oil, ensure that injection pressure reaches 2500bar or more.
Lubricating oil viscosity increases with pressure rise, due to the section of the lubricating oil big to viscosity of lower plunger ring shape microgap 10
Stream effect, so only a small amount of super-pressure lubricating oil is from annular lubricant oil groove 6 through the leakage of lower plunger ring shape microgap 10, warp
Lubricating oil return pipe 16 flows back to grease-box；Superelevation compression ignition with the oil leak in annular lubricant oil groove 6, in pump chamber 3.1
Oil enters the lubricating oil that pressure transmission chamber 5.2 pushes free-piston 4 to leak to right lateral complementary ring shape lubrication groove 6, keeps donut-type oil
Superelevation Lubricating Oil pressure P in slot 6R1Equal to the super-pressure fuel oil oil pressure P in pump chamber 3.1K1, lower plunger ring row microgap 10
In lubricating oil film make plunger 1 work cylinder holes 3 in float, avoid stay plug 1 with work cylinder holes 3 directly contact, effectively overcome
The problem of plunger 1 and work cylinder holes 3 wear-out failure.
When plunger 1 goes upward to top dead centre, the pump oil process of 1 uplink of plunger terminates, and oil outlet one-way valve 13 is closed.
When tappet roller component and the driving of spring cam driving mechanism 15 1 downlink of plunger, above-mentioned oil suction, pump oil mistake are repeated again
Journey.
The diesel engine super-pressure vehicle fuel pump structure of the utility model keeps upper prop plug ring in 1 downlink oil-absorbing process of plunger
Lubrication pressure P in the annular lubricant oil groove 6 of 9 lower end of shape microgapRP is pressed than the fuel oil in the pump chamber 3.1 of upper endK2High by 2~
5bar；The super-pressure in the annular lubricant oil groove 6 of 9 lower end of upper plug annular microgap is kept during 1 uplink pump oil of plunger
Lubrication pressure PR1P is pressed with the fuel oil of the super-pressure in the pump chamber 3.1 of upper endK1It is equal, PR1=PK1；1 downlink oil suction of plunger with
It effectively prevents the fuel oil in pump chamber 3.1 to enter upper plug annular microgap 9 in the course of work of 1 uplink pump oil of plunger, has
The fuel leakage problem of super-pressure is overcome to effect, to ensure that the diesel engine super-pressure vehicle fuel pump structure generates 2500bar
Above super-pressure pump oil pressure and without fuel leakage；Lubricating oil film in lower plunger ring shape microgap 10 makes plunger 1 work
It floats in cylinder holes 3, avoids plunger 1 and directly contacted with work cylinder holes 3, effectively overcome the abrasion of plunger 1 and the cylinder holes 3 that works
Problem of Failure improves functional reliability and working life.
Finally, it should be noted that the above various embodiments is merely to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type.
Claims (1)
1. a kind of diesel engine super-pressure vehicle fuel pump structure, including plunger (1), the pump housing (2), working cylinder duct (3), pressure transmission oil har opening
Road (5), free-piston (4), annular lubricant oil groove (6), oil duct (6.1) and into lubricating oil check valve (7), it is characterised in that: institute
The one end and pump chamber (3.1) for stating pressure transmission oil cylinder duct (5) are run through, and free-piston (4) is in pressure transmission oil cylinder duct (5)；It is described
Pressure transmission oil cylinder duct (5) is separated into the pressure transmission chamber between free-piston (4) one end and pump chamber (3.1) by free-piston (4)
(5.2) and the lubricant reservoir (5.1) of free-piston (4) other end；One end of the oil duct (6.1) and the lubricant reservoir
(5.1) connection, the other end are connected with the annular lubricant oil groove (6)；It is described into lubricating oil check valve (7) and donut-type oil
Slot (6) connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820664913.7U CN208184873U (en) | 2018-05-07 | 2018-05-07 | A kind of diesel engine super-pressure vehicle fuel pump structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820664913.7U CN208184873U (en) | 2018-05-07 | 2018-05-07 | A kind of diesel engine super-pressure vehicle fuel pump structure |
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| Publication Number | Publication Date |
|---|---|
| CN208184873U true CN208184873U (en) | 2018-12-04 |
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| CN201820664913.7U Active CN208184873U (en) | 2018-05-07 | 2018-05-07 | A kind of diesel engine super-pressure vehicle fuel pump structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108533430A (en) * | 2018-05-07 | 2018-09-14 | 梁跃中 | A kind of diesel engine super-pressure vehicle fuel pump structure |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108533430A (en) * | 2018-05-07 | 2018-09-14 | 梁跃中 | A kind of diesel engine super-pressure vehicle fuel pump structure |
| CN108533430B (en) * | 2018-05-07 | 2023-12-19 | 梁跃中 | Super-high pressure fuel pump structure of diesel engine |
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