CN108240244A - Diesel engine inlet valve variable system and diesel engine - Google Patents
Diesel engine inlet valve variable system and diesel engine Download PDFInfo
- Publication number
- CN108240244A CN108240244A CN201711469755.6A CN201711469755A CN108240244A CN 108240244 A CN108240244 A CN 108240244A CN 201711469755 A CN201711469755 A CN 201711469755A CN 108240244 A CN108240244 A CN 108240244A
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- oil
- diesel engine
- plunger
- push rod
- valve
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- 239000000314 lubricant Substances 0.000 claims description 30
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 abstract description 8
- 239000003921 oil Substances 0.000 description 186
- 239000010687 lubricating oil Substances 0.000 description 13
- 230000007246 mechanism Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 231100001261 hazardous Toxicity 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0031—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of tappet or pushrod length
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
- F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The present invention provides a kind of diesel engine inlet valve variable systems, are slid up and down by push rod, rocking arm pressure is born by the external part of plunger.When push rod slides to lower dead center, fluid flows into plunger actuation end by oil inlet oil circuit, and plunger is ejected spool；Push rod is moved up to top dead centre, and oil return circuit connects the driving end of plunger, and when control valve is closed, the oil pressure at plunger actuation end is identical with the oil pressure of oil return circuit, and the external part of plunger bears rocking arm pressure.When control valve is opened, oil return circuit is connected, the fluid at plunger actuation end is discharged by oil return circuit, plunger is retracted so that the length of push rod shortens, and valve realization is closed in advance, it is located at the oil inlet oil circuit and oil return circuit of push rod sliding top dead centre and lower dead center respectively by setting, active control is carried out to push rod length by control valve, realizes and valve is controlled adjustable, optimize the control structure of changeable air valve.The present invention also provides a kind of diesel engines with above-mentioned diesel engine inlet valve variable system.
Description
Technical field
The present invention relates to Diesel Engine Technique Field, more specifically to a kind of diesel engine inlet valve variable system and bavin
Oil machine.
Background technology
Since the 1980s, energy and environmental problem becomes increasingly conspicuous, and society is to fuel-economy type and hazardous emission
Requirement it is higher and higher.In order to improve engine performance, improve the thermal efficiency and reduce hazardous emission it is necessary to engine into
Row improves.
Conventional, four-stroke engine is generally using mechanical camshaft actuated inlet door and the valve actuating mechanism of exhaust valve, gas
Door movement is controlled by the mechanical tradition between camshaft and each valve, and this mechanical mechanism is simple and reliable, but valve machine
The parameters such as structure opening time and phase, lift are changeless, and the performance of engine is not in full use.Changeable air valve
Periodically/lift technology so that port timing is under different engine and load, when providing variable valve opening, closing
Carve or lift, so as to improve engine inlet and outlet performance, preferably meet engine high rotating speed and the slow-speed of revolution, big load with
Dynamic property, economy and emission request during Smaller load.
There are many variable valve actuations, but generally existing structure is answered by numerous studies in foreign study mechanism
Miscellaneous and practical mechanism is seldom.Variable valve actuating mechanism is to change camshaft phase as major way in existing product, to primary dynamic
Machine change it is bigger, be more common in small-power gasoline engine, for high-power diesel engine application almost without it is difficult to intake and exhaust
Door adjusts respectively.
A kind of variable valve actuator for air in the prior art is realized and diesel engine electrohydraulic is controlled, set in former Engine Push Rod
A plunger is put, ram lift is superimposed upon in former valve stroke, realizes that valve timing or lift are variable.Pressure in plunger cavity
The disengaging of power oil is controlled in real time by high speed, big flow solenoid valve, and each cylinder of engine often works one and recycles, pressure oil disengaging plunger
Chamber is primary.Since each cylinder of engine takes turns to operate, so need to set solenoid electric valve respectively to each cylinder, it is of high cost.Engine
Rotating speed it is very high, it is desirable that the response of the switch of solenoid electric valve is fast, and control valve must satisfy traffic requirement, and manufacture difficulty is big.Respectively
Cylinder sets solenoid electric valve and has stringent timing requirements respectively, and requirements at the higher level are proposed to control system.
Therefore, how to optimize the control structure of changeable air valve, be a problem to be solved by those skilled in the art.
Invention content
In view of this, the present invention provides a kind of diesel engine inlet valve variable system, to optimize the control knot of changeable air valve
Structure；The present invention also provides a kind of diesel engines.
In order to achieve the above object, the present invention provides following technical solution：
A kind of diesel engine inlet valve variable system, including sliding the push rod for being arranged in engine cylinder and covering, the push rod
External part is provided with the spool of built-in extended plunger, and the oil inlet passage for connecting the plunger actuation end is set in the push rod；
It is provided on the body of rod of the push rod and radially arranges, and the drainback passage connected with the oil inlet passage, institute
State engine cylinder and cover and be provided with when the push rod is snapped down to lower dead center, connected with the oil inlet of the drainback passage into
Oil circuit and when sliding to top dead centre on the push rod, the oil return circuit connected with the oil outlet of the drainback passage；
It is provided on the oil returning tube of the oil return circuit and controls the oil returning tube conducting or the control valve being closed.
Preferably, in above-mentioned diesel engine inlet valve variable system, engine cylinder cover described in the oil inlet oil communication
Lubricant passage way is provided between the lubricant passage way and the drainback passage along the unidirectional of the oil inlet direction unlatching of the spool
Valve.
Preferably, in above-mentioned diesel engine inlet valve variable system, the engine cylinder, which covers, to be fixed with to the push rod
The pedestal that is oriented to of sliding, offer the compensation oil for connecting the lubricant passage way and the drainback passage on the pedestal
Road, the check valve are arranged in the compensation oil circuit.
Preferably, in above-mentioned diesel engine inlet valve variable system, the check valve include to the lubricant passage way into
The steel ball that row is blocked pushes resetting spring and the top for being set to the compensation oil circuit that the steel ball resets, and props up
Support the limited block of the resetting spring.
Preferably, in above-mentioned diesel engine inlet valve variable system, the oil inlet oil circuit and the oil return circuit open up
In on the pedestal, and it is located at the both ends of the push rod radial direction respectively.
Preferably, in above-mentioned diesel engine inlet valve variable system, the external part of the spool offers the connection valve
The plunger ejection hole of core inner, the end of the plunger are extended with the plunger ejection slided and be arranged in the plunger ejection hole
Portion, the driving end of the plunger are provided with the return spring to offset with the bottom of the spool.
Preferably, in above-mentioned diesel engine inlet valve variable system, oil inlet and the oil outlet difference of the drainback passage
It offers into oil ring groove and goes out oil ring groove, the end of the oil inlet oil circuit is provided with and the oil ring opposite into oil ring groove
Slot, the oil inlet end setting of the oil return circuit with it is described go out the opposite oil return annular groove of oil ring groove.
Preferably, in above-mentioned diesel engine inlet valve variable system, the common rail pipe for connecting the oil return circuit is further included,
The control valve is set on the drain line of the common rail pipe.
A kind of diesel engine, which is characterized in that be provided with the as above any one diesel engine inlet valve variable system.
Preferably, in above-mentioned diesel engine, the multiple inlet valves of setting in the diesel engine, each inlet valve is all provided with
The diesel engine inlet valve variable system is equipped with, the oil return circuit of each diesel engine inlet valve variable system is communicated in together
On one common rail pipe.
Diesel engine inlet valve variable system provided by the invention including sliding the push rod for being arranged in engine cylinder and covering, pushes away
The external part of bar is provided with the spool of built-in extended plunger, and the oil inlet passage at connection plunger actuation end is set in push rod；Push rod
The body of rod on be provided with and radially arrange, and the drainback passage connected with oil inlet passage, engine cylinder is covered to be provided with and pushed away
When bar is snapped down to lower dead center, the oil inlet oil circuit that is connected with the oil inlet of drainback passage and when sliding to top dead centre on push rod, with
The oil return circuit of the oil outlet connection of drainback passage；Be provided on the oil returning tube of oil return circuit control oil returning tube conducting or
The control valve of closure.
Push rod slides up and down, and spool and the engine rocker of external part offset, and rocking arm for pressing is born by the external part of plunger
Power.When push rod slides to lower dead center, oil inlet oil circuit is connected with drainback passage, and fluid flows into plunger actuation end by oil inlet oil circuit, by column
Plug ejection spool；Push rod is moved up to top dead centre, and oil return circuit connects the driving end of plunger, when control valve is closed, plunger actuation
The oil pressure at end is identical with the oil pressure of oil return circuit, and the external part of plunger bears rocking arm pressure.When control valve is opened, oil return oil
Road is connected, and the fluid at plunger actuation end is discharged by oil return circuit, and plunger is retracted so that the length of push rod shortens, and valve realization carries
Preceding closing is located at the oil inlet oil circuit and oil return circuit of push rod sliding top dead centre and lower dead center by setting, passes through control respectively
Valve carries out active control to push rod length, realizes and valve is controlled adjustable, optimizes the control structure of changeable air valve.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will to embodiment or
Attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to these attached drawings.
Fig. 1 is the structure diagram of diesel engine inlet valve variable system provided by the invention；
Fig. 2 is the valve control type line chart of diesel engine inlet valve variable system provided by the invention.
Specific embodiment
The invention discloses a kind of diesel engine inlet valve variable systems, optimize the control structure of changeable air valve；The present invention
Additionally provide a kind of diesel engine.
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Whole description, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
The embodiment of the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
As shown in FIG. 1, FIG. 1 is the structure diagrams of diesel engine inlet valve variable system provided by the invention.
This application provides a kind of diesel engine inlet valve variable systems, and pushing away on engine cylinder cover 1 is arranged in including sliding
Bar 21, the external part of push rod 21 are provided with the spool 12 of built-in extended plunger 11, and setting connection plunger 11 drives in push rod 21
The oil inlet passage 9 at end；It is provided on the body of rod of push rod 21 and radially arranges, and the drainback passage connected with oil inlet passage 6
211, be provided with when push rod 21 is snapped down to lower dead center on engine cylinder cover 1, connected with the oil inlet of drainback passage 211 into
Oil circuit 6 and when sliding to top dead centre on push rod 21, the oil return circuit 15 connected with the oil outlet of drainback passage 211；Oil return
The conducting of control oil returning tube or the control valve 19 being closed are provided on the oil returning tube of oil circuit 15.
Push rod slides about 21, and spool 12 and the engine rocker of external part offset, and are born by the external part of plunger 11
Rocking arm pressure.When push rod 21 slides to lower dead center, oil inlet oil circuit 6 is connected with drainback passage 211, and fluid flows into column by oil inlet oil circuit 6
Plug driving end, spool 12 is ejected by plunger 11；Push rod 21 is moved up to top dead centre, and oil return circuit 15 connects the driving end of plunger, when
When control valve 19 is closed, the oil pressure at the driving of plunger 11 end is identical with the oil pressure of oil return circuit 15, and the external part of plunger 11 bears to shake
Arm pressure.When control valve 19 is opened, oil return circuit 15 is connected, and plunger 11 drives the fluid at end to be discharged by oil return circuit 15, column
Plug 11 is retracted so that the length of push rod 21 shortens, and valve realization is closed in advance, is located at respectively in the sliding of push rod 21 by setting
Stop and the oil inlet oil circuit 6 of lower dead center and oil return circuit 15 carry out active control by control valve 19 to 21 length of push rod, real
Now to the adjustable of valve control, the control structure of changeable air valve is optimized.
In one specific embodiment of this case, oil inlet oil circuit 6 connects the lubricant passage way 2 of engine cylinder cover 1,2 He of lubricant passage way
The check valve along the oil inlet direction unlatching of spool 12 is provided between drainback passage 211.On oil inlet oil circuit 6 and engine cylinder cover 1
Lubricant passage way 2 connect, provided by the oil pressure in lubricant passage way 2 to the driving oil pressure of 12 inner plunger 11 of spool.Simultaneously as
Lubricant passage way 2 in engine cylinder cover 1 connects the sliding channel of push rod 21, is set between lubricant passage way 2 and drainback passage 211
Check valve is put, the opening direction of check valve flows into the direction of 21 inner spool 12 of push rod for lubricating oil in lubricant passage way 2, works as push rod
21 when moving up, and drainback passage 211 is moved up to be separated with the dislocation of oil inlet oil circuit 6, and oil inlet oil circuit 6 is sealed by the outer wall of push-rod hole
It is stifled.Check valve is set, on the one hand when oil pressure is identical with oil pressure in lubricant passage way 2 in spool 12, by check valve to lubricant passage way
2 are blocked, and are on the other hand avoided in spool 12 after oil pressure stabilization, 2 inner fluid of lubricant passage way is continuously fed to the sliding of push rod 21
Channel causes oil leak.
In one specific embodiment of this case, the pedestal being oriented to the sliding of push rod 21 is fixed on engine cylinder cover 1
3, the compensation oil circuit of connection lubricant passage way 2 and drainback passage 211 is offered on pedestal 3, check valve is arranged in compensation oil circuit.
Oil inlet oil circuit 6 and oil return circuit 15 are set in pedestal 3, and pedestal 3 is fixed on 1 inner wall of engine cylinder cover, offers and sends out thereon
The pusher slide Mobile Communication hole that motivation cylinder cap 1 connects.
Lubricant passage way 2 is located in engine cylinder cover 1, and pedestal 3 is opened up through its thickness direction, and is connected with lubricant passage way 2
Compensation oil circuit, compensation oil circuit simultaneously connected with drainback passage 211.Check valve is arranged in pedestal 3, for lubricant passage way 2
Closure.
Specifically, check valve includes carrying out the steel ball blocked 4 to lubricant passage way 2, pushes answering for the reset of steel ball 4
Position spring 5 and the top for being set to compensation oil circuit, and support the limited block 8 of resetting spring 5.Setting compensation oil circuit and lubricating oil
The oil circuit internal diameter that road 2 connects is more than the internal diameter of lubricant passage way 2, and steel ball 4 slides in compensation oil circuit, to the fuel-displaced of lubricant passage way 2
Mouth is blocked.Compensation oil circuit is blocked by limited block 8, resetting spring 5 is set between limit hole 8 and steel ball 4, limited block 8 is with mending
Repaying can be connected by helicitic texture between oil circuit, and limited block 8 is set as limit screw cap.
In one specific embodiment of this case, oil inlet oil circuit 6 and oil return circuit 15 are opened on pedestal, and be located at respectively
The both ends of 21 radial direction of push rod.For the ease of the arrangement of drainback passage 211 on push rod 21, avoid influencing to push away after trepanning on push rod 21
The self-strength of bar 21, by radial arrangement of the drainback passage 211 along push rod 21.Accordingly, drainback passage 211 be carried out at the same time with
The oil inlet work of lubricant passage way connection and the work of draining the oil connected with oil return circuit 15, by oil inlet oil circuit 6 and oil return circuit 15
It is set on pedestal 3, and positioned at the both ends of 21 radial direction of push rod, in oil inlet, the oil outlet of drainback passage 211 is above pushed away by pedestal 3
The inner wall of 21 slideway of bar blocks；In oil return, the oil inlet of drainback passage 211 is blocked by the inner wall that push rod 21 slides into, so as to letter
Changed drainback passage into fuel-displaced and plugging structure.
In one specific embodiment of this case, the external part of spool 12 offers the plunger ejection hole inside connection spool 12,
The end of plunger 11 is extended with the plunger ejection part for sliding and being arranged in plunger ejection hole, the driving end of plunger 11 be provided with
The return spring 13 that the bottom of spool 12 offsets.Spool 12 is sliding valve structure, and interior skidding off and slipping by plunger 11 changes
Become the length of push rod 21.The external part of spool 12 opens up plunger ejection hole, and 11 end set plunger ejection part of plunger is stretched out with shaking
Arm offsets, and changes the length of push rod 21.The driving end of plunger 11 sets return spring 13 with 12 bottom of spool, when spool 12 is pressed
When the lubricating oil being full of in power room 10 is unsealed, 11 top of plunger can be opposite with compression retracteding position spring 13 when bearing pressure
Spool moves down.When being full of lubricating oil in balancing gate pit 10, while during the sealing of oil return circuit 15, due to lubricating oil volume elasticity
Modulus is very big, and the top of plunger 11 also can not compression retracteding position spring 13 when bearing pressure.In compressed plunger return,
Lubricating oil enters balancing gate pit 10 in lubricant passage way, jacks up plunger with 13 collective effect of return spring.Plunger 11 and spool 12
Relative sliding so that the length of 21 top half of push rod is variable there are two benches, i.e., 12 end of spool is stretched out in plunger head portion
Length displacement, this is displacement superposed in diesel engine inlet valve lift, and valve timing or lift can be changed.
In one specific embodiment of this case, the oil inlet and oil outlet of drainback passage 211 are offered respectively into oil ring groove 7
With go out oil ring groove 16, the end of oil inlet oil circuit 6 be provided with into the opposite oil supply annular groove of oil ring groove 7, the oil inlet of oil return circuit 15
End sets the oil return annular groove 14 opposite with going out oil ring groove 16.Push rod 21 slides in the push-rod hole of pedestal, due to 21 last time of push rod
The inner wall of oily channel 211 and push-rod hole is in direct contact, and causes push rod about 21 in slipping, is rubbed and is held between push-rod hole
The problem of being also easy to produce burn oil, by being set the oil inlet of drainback passage 211 and oil outlet respectively into oil ring groove 7 and fuel-displaced
Annular groove 16 realizes lubricating oil by way of improving fluid amount cooling to a certain extent, accordingly, drainback passage 211
During positioned at top dead centre or lower dead center, opened up on the inner wall of push-rod hole and the oil supply annular groove of 211 corresponding position of drainback passage and oil return
Annular groove is further improved in push rod slipping, the cooling capacity between drainback passage and push-rod hole.
In one specific embodiment of this case, the common rail pipe 18 of connection oil return circuit 15 is further included, control valve 19 is set to altogether
On the drain line of rail pipe.Common rail pipe 18 is flowed by the lubricating oil that oil return circuit 15 is discharged, the two is connected by common rail pipe fitting 17
It is logical, oil extraction control valve 19 is set on the drain line of common rail pipe 18, and oil extraction flows back into body oil return position 20, control valve 19
It is turned on and off conducting oil return circuit or closes oil return circuit 15, realize the emission control to lubricating oil in spool 12.Setting is altogether
Push rods 21 multiple in diesel engine can be set valve core structure simultaneously simultaneously, each spool is controlled by same control valve 19 by rail pipe 18
It is opened and closed while 12, control valve is solenoid valve, accesses diesel engine control system, realizes to oil inlet and oil return in spool pressure room 10
Logic control.
As shown in Fig. 2, Fig. 2 is the valve control type line chart of diesel engine inlet valve variable system provided by the invention.Fig. 2
Give the crank angle variation with the cam 22 of bent axle, the valve molded lines of inlet valve lift.
Diesel engine inlet valve variable system provided in this embodiment can realize that 21 length two benches of push rod are variable, you can real
Existing inlet valve early closes pattern and inlet valve normal off mode.
When engine operates, 2 inner engine oil pressure of lubricant passage way is higher, when cam 22 and 12 relative position of spool are cam
During basic circle, oil inlet oil circuit 6 is communicated with drainback passage 211, and 11 top of plunger is not subject to rocking arm pressure at this time, and balancing gate pit 10 is in
Pressure-less state, the open-top steel ball 4 of engine lubricating oil by oil inlet oil circuit 6, into oil ring groove 7, go out oil ring groove 16 and oil inlet passage
9 enter in balancing gate pit 10；It is rotated with back valve core 12 according to cam 22, relative to 3 uplink of pedestal, 11 top of plunger starts to bear
Rocking arm pressure, oil pressure rapid increase in balancing gate pit 10, steel ball 4 are taken a seat, and lubricating oil is sealed in balancing gate pit 10 and oil inlet passage 9
In, plunger 11 can not downlink；Continue uplink relative to pedestal 3 with back valve core 12, communicated when going out oil ring groove 16 with oil return annular groove 14
When, balancing gate pit 10 is communicated with oil return common rail pipe 18, can realize following A, B two states by break-make solenoid valve 19 at this time.
A, solenoid valve 19 controls oil return common rail pipe 18 to be communicated with body oil return position 20；
Plunger 11 bears rocking arm pressure, the high pressure oil in balancing gate pit 10 through oil inlet passage 9, go out oil ring groove 16, oil return annular groove
14th, oil return circuit road 15, oil return common rail pipe 18 and solenoid valve 19 let out body oil return position 20 rapidly, and plunger 11 is relative to valve
12 downlink of core, push rod length shorten, and valve realization is closed in advance, as shown in valve molded line 201 in Fig. 2.
B, solenoid valve 19 controls oil return common rail 18 to be disconnected with body oil return position 20；
Plunger 11 bears rocking arm pressure, and the high pressure oil in balancing gate pit 10 is identical with the lubricating oil in oil return common rail pipe 18
Pressure, the lubricating oil in balancing gate pit 10 can not release, and plunger 11 is relative to 12 non-displacement of spool, and 21 length of push rod is constant, valve
Normal switching-off is realized, as shown in valve molded line 202 in Fig. 2.
Based on the diesel engine inlet valve variable system provided in above-described embodiment, the present invention also provides a kind of diesel engine,
The diesel engine inlet valve variable system that the diesel engine is equipped with is the variable system of diesel engine inlet valve provided in above-described embodiment
System.
Diesel engine inlet valve variable system provided in this embodiment can put cam axle engine base to existing side bottom
It can realize that push rod length two benches are variable after being simply transformed on plinth, using slide-valve gear, pass through the oil in balancing gate pit 10
The instantaneous switching of amount is completed by mechanical structure, improves reliability；Fuel feeding is carried out using lubricant passage way, does not need to add additional pump
Oily device, by the lubricant passage way inner engine oil pressure of engine itself, you can completion mechanism is oil-filled, overcomes additional addition oil
The cost increase brought and complete machine Layout Problem are pumped, and reduces energy consumption.
And the diesel engine inlet valve variable system that this case provides, it can realize that multi-cylinder IC Intake Valve Closes are determined according to actual needs
When two benches adjustment, to greatest extent play air inlet phase adjustment flexibility, promoted engine performance.
Since the diesel engine employs the diesel engine inlet valve variable system of above-described embodiment, so the diesel engine is by bavin
The advantageous effect that oil machine inlet valve variable system is brought please refers to above-described embodiment.
In one specific embodiment of this case, the multiple inlet valves of setting, each inlet valve are both provided with diesel engine in diesel engine
Inlet valve variable system, the oil return circuit of each diesel engine inlet valve variable system are communicated on same common rail pipe.Diesel engine
Each inlet valve the timing of inlet valve or lift are controlled by diesel engine inlet valve variable system, all air inlets
The oil return oil pipe of door is synchronized by common rail pipe and connected, and by the opening and closing of the control valve on common rail pipe drain line, is realized to balancing gate pit 10
The instantaneous switching of interior oil mass, the timing of Synchronization Control valve or lift, oil mass switching action pass through spool and the machine of oil return circuit
Tool structure is completed, and be ensure that the reliability of system, is overcome the consistency difference problem as caused by solenoid valve control, reduce
Cost.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications of these embodiments will be apparent for those skilled in the art, it is defined herein
General Principle can realize in other embodiments without departing from the spirit or scope of the present invention.Therefore, originally
Invention is not intended to be limited to the embodiments shown herein, and is to fit to special with principles disclosed herein and novelty
The consistent most wide range of point.
Claims (10)
1. a kind of diesel engine inlet valve variable system, which is characterized in that including sliding the push rod for being arranged in engine cylinder and covering, institute
The external part for stating push rod is provided with the spool of built-in extended plunger, in the push rod setting connect the plunger actuation end into
Oily channel；
It is provided on the body of rod of the push rod and radially arranges, and the drainback passage connected with the oil inlet passage, the hair
Engine cylinder covers the oil inlet oil for being provided with and, when the push rod is snapped down to lower dead center, being connected with the oil inlet of the drainback passage
Road and when sliding to top dead centre on the push rod, the oil return circuit connected with the oil outlet of the drainback passage；
It is provided on the oil returning tube of the oil return circuit and controls the oil returning tube conducting or the control valve being closed.
2. diesel engine inlet valve variable system according to claim 1, which is characterized in that described in the oil inlet oil communication
The lubricant passage way of engine cylinder cover is provided between the lubricant passage way and the drainback passage to along the oil inlet side of the spool
To the check valve of unlatching.
3. diesel engine inlet valve variable system according to claim 2, which is characterized in that the engine cylinder, which covers, to be fixedly mounted with
There is the pedestal being oriented to the sliding of the push rod, the connection lubricant passage way is offered on the pedestal and the oil return is led to
The compensation oil circuit in road, the check valve are arranged in the compensation oil circuit.
4. diesel engine inlet valve variable system according to claim 3, which is characterized in that the check valve is included to described
The steel ball blocked of lubricant passage way pushes resetting spring and be set to the compensation oil circuit that the steel ball resets
Top, and support the limited block of the resetting spring.
5. diesel engine inlet valve variable system according to claim 3, which is characterized in that the oil inlet oil circuit and described time
Oil circuit is opened on the pedestal, and is located at the both ends of the push rod radial direction respectively.
6. diesel engine inlet valve variable system according to claim 1, which is characterized in that the external part of the spool opens up
There is the plunger ejection hole for connecting the valve core inside, the end of the plunger is extended with slip and is arranged in the plunger ejection hole
Plunger ejection part, the driving end of the plunger is provided with the return spring to offset with the bottom of the spool.
7. diesel engine inlet valve variable system according to claim 1, which is characterized in that the oil inlet of the drainback passage
It is offered respectively with oil outlet into oil ring groove and goes out oil ring groove, the end of the oil inlet oil circuit is provided with described into oil ring groove phase
To oil supply annular groove, the oil inlet end setting of the oil return circuit with it is described go out the opposite oil return annular groove of oil ring groove.
8. diesel engine inlet valve variable system according to claim 1, which is characterized in that further include the connection oil return oil
The common rail pipe on road, the control valve are set on the drain line of the common rail pipe.
9. a kind of diesel engine, which is characterized in that it is variable to be provided with the diesel engine inlet valve as described in claim any one of 1-8
System.
10. diesel engine according to claim 9, which is characterized in that the multiple inlet valves of setting, Mei Gesuo in the diesel engine
It states inlet valve and is both provided with the diesel engine inlet valve variable system, the oil return oil of each diesel engine inlet valve variable system
Road is communicated on the same common rail pipe.
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| WO2019127321A1 (en) * | 2017-12-29 | 2019-07-04 | 潍柴动力股份有限公司 | Intake valve variable system for diesel engine and diesel engine |
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| CN117569890A (en) * | 2024-01-15 | 2024-02-20 | 潍柴动力股份有限公司 | Engine and valve mechanism thereof |
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