CN101418709B - Distribution plate controlled two-mode engine valve timing changing system - Google Patents
Distribution plate controlled two-mode engine valve timing changing system Download PDFInfo
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- CN101418709B CN101418709B CN2008101522732A CN200810152273A CN101418709B CN 101418709 B CN101418709 B CN 101418709B CN 2008101522732 A CN2008101522732 A CN 2008101522732A CN 200810152273 A CN200810152273 A CN 200810152273A CN 101418709 B CN101418709 B CN 101418709B
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- camshaft
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- distribution switchboard
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- pump
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses two mode engine valve timing variable system controlled by distribution plate, which comprises a hydraulic tappet assembly. One of the hydraulic tappet assembly is pressed with a valve rocker on the top end, and the other end is connected with a camshaft driven by the engine. The system also comprises a hydraulic drive system for driving the telescoping of the hydraulic tappet assembly and an oil-way distribution plate, wherein the hydraulic drive system drives the hydraulic tappet assembly through the distribution plate, and the camshaft is also connected with the distribution plate and controls the conduction of the distribution plate. The invention has simple structure, safety and convenience, long part service life, low cost, little system power consumption, is easy to realize technical industrialization, can individually control the inlet valve timing or the exhaust valve timing, and also can regulate the inlet vale timing and exhaust valve timing at the same time according to requirement, only need adding one distribution plate. The late close of the inlet vale can realize Miller Cycle, improve the engine efficiency and reduce emission, and realize the function of variable exhaust turbocharging.
Description
Technical field
The present invention relates to a kind of engine valve timing and lift variable system.Particularly relate to a kind of two-mode engine air valve correct-timing variable system that can carry out the distribution switchboard control of timing adjustment respectively to the inlet and outlet door.
Background technique
Since the eighties in 20th century, the energy and environmental problem become increasingly conspicuous, society is to the increasingly stringent that requires of the Economy of fuel oil and noxious emission, how to improve motor performance, improve the thermal efficiency and reduce noxious emission and more and more receiving publicity, this just requires conventional engines is improved.
The port timing of motor plays crucial effects to the quality of combustion process.The selection of port timing will be considered the problems such as fuel economy, low-speed stability and toxic emission under the high-speed power, low speed torque, idling oil consumption, sub load of motor.Traditional piston four stroke engine generally adopts the distribution device of mechanical type camshaft actuated inlet door and exhaust valve.Valve move through bent axle and camshaft, the mechanical transmission between camshaft and each valve is controlled regularly.This mechanical type mechanism is proved to be simply, effectively and reliably, and expense is cheap relatively.Yet this valve mechanism is in the unlatching moment of valve, and it is changeless opening on the parameters such as endurance and valve lift, can't regulate in engine operation, and work lacks flexible.And these changeless valve Operational Limitss can not provide best timing in all cases, and the engine performance potentiality can not be not fully exerted.The distribution time is necessarily changed, can satisfy the basic demand of the most of operating mode of internal-combustion engine, so be considered to feasible.In order to obtain engine performance preferably, port timing should change along with the variation of rotating speed and load.Motor is needing bigger valve overlap and IC Intake Valve Closes angle at a high speed and under the big load, so that obtain higher power output; Otherwise, at idling and less IC Intake Valve Closes angle and the valve overlap of the next needs of the little load of low speed, so that obtain idling stationarity and gas exhausting property preferably.
Engine operation person has improved the design of motor at reducing Engine's Harmful Emission, improved the control system of motor, exhaust gas recirculation (EGR) and post-processing technology have appearred, yet be accompanied by the minimizing of Engine's Harmful Emission, but cause the reduction of engine efficiency, and when adopting high pressure-charging pressure, may cause the motor maximum explosive pressure too high.The variable gas distribution technology can realize miller cycle by changing the valve opening close moment, under certain operating mode of motor operation, the time that can utilize the retarded admission door to close, the gas that makes a part enter cylinder reenters intake manifold, and under turbo charged effect, keeping certain air pressure, the intake efficiency of motor can increase and reduce pump greatly and inhale loss.Thereby the many reduction compression ratios when so just having caused actual pressurized air not have air inlet cause expansion ratio greater than compression ratio, reduce the maximum explosive pressure of engine operation.
Compare with fixing port timing, variable valve timing then can be under rotating speed in the motor different operating scope and load, variable valve opening, close moment or lift is provided, thereby improve motor inlet and outlet performance, satisfy the requirement of motor preferably, the whole motor combination property that improves in high rotating speed and the slow-speed of revolution, big load power character, Economy, toxic emission during with little load.The development of modern high technology is carried out comprehensive study and technological development with energy-conservation, synergy, the low emission of motor car engine as " energy-conservation-efficient-environmental protection " integrated problem.The changeless restriction of the port timing incompatibility requirements of the times that more and more seem, for this reason, the changeable air valve technology has become one of motor car engine research emphasis direction.
The variable gas distribution technology is because the advantage of self, be subject to people's attention day by day, foreign study mechanism has carried out a large amount of research, a variety of variable valve actuations have appearred, some system has realized the function of valve changeable parameters, but have only minority mechanism simple in structure, lower-cost to realize commercialization, most of variable valve actuations are because the higher or reliability problems of cost is only at the experimental stage.Variable valve actuating mechanism in the existing product is main mode with the phase place that changes camshaft, and is all bigger to the change of former motor, is more common in the small-power petrol engine.Because high-power diesel engine intake and exhaust cam axle is divided into " overhead " and " putting at the bottom of the side " two kinds, because " putting at the bottom of the side " camshaft makes engine structure simple, low cost of manufacture, use very extensive at present, usually its inlet and exhaust valve is by same camshaft actuated, be difficult to make inlet and exhaust valve to adjust respectively, so the changeable air valve technology of high-power diesel engine remains to be developed.
Summary of the invention
Technical problem to be solved by this invention is, a kind of both less demanding to material and process equipment are provided, former diesel engine is changed little, the two-mode engine air valve correct-timing variable system of the distribution switchboard of reliable operation control simultaneously.
The technical solution adopted in the present invention is: a kind of two-mode engine air valve correct-timing variable system of distribution switchboard control, include: the hydraulic tappet assembly, the top of described hydraulic tappet assembly one end is pressed with valve rocker, the other end connects camshaft, described camshaft is by engine-driving, also be provided with and drive hydraulic tappet assembly flexible hydraulic driving system and oil circuit distribution switchboard, described hydraulic driving system is to drive the hydraulic tappet assembly by distribution switchboard, described camshaft also connects distribution switchboard and controls its conducting, described hydraulic driving system includes: sump, the oil pump of junctor fuel tank, drive the pump drive of oil pump and the pressure regulator valve that is connected with oil pump, wherein, described pressure regulator valve is also distinguished the junctor fuel tank and is passed through the oil-feed oil circuit connection hydraulic tappet assembly of distribution switchboard, described sump also is communicated with the oil return circuit of distribution switchboard, described distribution switchboard includes: price fixing and be the Moving plate of running shaft with the center of price fixing has most the oil-through holes that are communicated with oil-feed oil circuit and oil return circuit respectively on the rotating locus of described price fixing upper edge Moving plate.
Described oil pump is a kind of in gear pump, plunger pump, rotor pump and the vane pump.
Described pump drive is a kind of in motor, the mechanical driving structure.
The Moving plate of described distribution switchboard is to connect camshaft by shaft joint, or is connected camshaft by the gear that links to each other with camshaft, or by having the axle or the gear of same rotational speed to be connected camshaft with camshaft arbitrarily.
Described system can control the intake valve timing separately or control exhaust valve timing separately, or realizes the adjustment of inlet and outlet door timing simultaneously, when realizing the adjustment of inlet and outlet door timing simultaneously, is provided with two distribution switchboards that link to each other with camshaft.
The two-mode engine air valve correct-timing variable system of distribution switchboard control of the present invention is by the control of mechanical type distribution switchboard, safe ready simple in structure; Machining accuracy and mechanical properties of materials to hydraulic tappet idol part and distribution switchboard do not have too high request, the long service life of element; Can carry out the adjustment of timing respectively to the inlet and outlet door; The hydraulic tappet assembly can be reequiped on the existing push rod basis of common engine, and distribution switchboard can be contained on the engine cam shaftgear, and little to former machine change, cost is low, is easy to the industrialization of the technology that realizes; Working pressure is less demanding, and the required driving power of low pressure fuel pump is little, so the power consumption of system is little; Can be that each cylinder of motor distributes the control oil pressure simultaneously, each cylinder independence Control work be reliable; Can control the intake valve timing separately or control exhaust valve timing separately, also can realize the adjustment of inlet and outlet door timing as required simultaneously, only need add a distribution switchboard and can realize; Miller cycle can be realized in intake valve pass in evening, improves engine efficiency and reduces discharging; The ratio that can change between motor acting and exhaust energy early left by exhaust valve, realized variable to a certain extent
The function of exhaust gas turbocharge.
Description of drawings
Fig. 1 is the system principle schematic representation of the two-mode engine air valve correct-timing variable system of distribution switchboard control of the present invention;
Fig. 2 is the two-mode engine air valve correct-timing variable system distribution switchboard working principle schematic representation of distribution switchboard control of the present invention.
Wherein:
1: sump 2: oil pump
3: pump drive 4: pressure regulator valve
5: distribution switchboard 6: camshaft
7: timing gear 8: the hydraulic tappet assembly
9: shaft joint 10: hydraulic driving system
51: Moving plate 52: price fixing
53: oil-through hole
Embodiment
Make a detailed description below in conjunction with the two-mode engine air valve correct-timing variable system of embodiment's accompanying drawing distribution switchboard control of the present invention.
As shown in Figure 1, the two-mode engine air valve correct-timing variable system of distribution switchboard control of the present invention, include: hydraulic tappet assembly 8, the top of described hydraulic tappet assembly 8 one ends is pressed with valve rocker, the other end connects camshaft 6, described camshaft 6 is by engine-driving, also be provided with and drive hydraulic driving system 10 and the oil circuit distribution switchboard 5 that hydraulic tappet assembly 8 stretches, described hydraulic driving system 10 is to drive hydraulic tappet assembly 8 by distribution switchboard 5, and described camshaft 6 also connects distribution switchboard 5 and controls its conducting.
Described hydraulic driving system 10 includes: sump 1, the oil pump 2 of junctor fuel tank 1, the pump drive 3 of pump 2 and the pressure regulator valve 4 that is connected with oil pump 2 are taken out in driving, wherein, described pressure regulator valve 4 is also distinguished junctor fuel tank 1 and is passed through the oil-feed oil circuit connection hydraulic tappet assembly 8 of distribution switchboard 5, and described sump 1 also is communicated with the oil return circuit of distribution switchboard 5.Described oil pump 2 is a kind of in gear pump, plunger pump, rotor pump and the vane pump.Described pump drive 3 is a kind of in motor, the mechanical driving structure.
As shown in Figure 2, described distribution switchboard 5 includes: price fixing 52 and be the Moving plate 51 of running shaft with the center of price fixing 52 has most the oil-through holes 53 that are communicated with oil-feed oil circuit and oil return circuit respectively on the rotating locus of described price fixing 52 upper edge Moving plates 51.Realize the break-make control of oil circuit by the relative movement between Moving plate 51 and the price fixing 52, and then realize elongation of hydraulic tappet assembly and the control of shortening.Having good reliability and selfsealings, can satisfy the distribution of oil-feed and oil return simultaneously, is for realizing the special-purpose controlling component of engine valve timing variable system design.
Described camshaft 6 is the Moving plates 51 that connect distribution switchboard 5 by shaft joint 9, or be connected the Moving plate 51 of distribution switchboard 5 by the gear that links to each other with camshaft 6, or by having the axle of same rotational speed or gear to be connected the Moving plate 51 of distribution switchboard 5 with camshaft 6 arbitrarily, thereby realize and the synchronous rotation of motor.
Described in the present invention camshaft 6 is positioned at distribution switchboard 5 one sides, and described Moving plate 51 is connected with timing gear 7.Moving plate 51 rotations that the timing gear 7 that link to each other with camshaft 6 drive camshaft 6 and distribution switchboard 5 realize that the Moving plate 51 and the camshaft 6 of distribution switchboard rotates synchronously, thereby realize the timing of air valve correct-timing variable system.
The present invention determines interior oil-feed of hydraulic tappet assembly and oil extraction time length in valve timing and work cycle of lift variable system by the size of Moving plate opening on the distribution switchboard.A distribution switchboard can distribute high pressure oil simultaneously for six hydraulic tappets, and the number of oil-through hole can be different as required, only needs the oil-through hole of the different numbers of processing on price fixing.
When system during at non-operating mode, the machine oil that described oil pump is carried directly enters sump through pressure regulator valve, hydraulic tappet length immobilizes and is former captain's degree, described hydraulic tappet assembly pumps with the engine cam rotation, and the inlet and outlet door is moved with lift according to the timing of former machine.
When system during in mode of operation, this system can realize that intake valve closes evening and can realize that also exhaust valve early leaves.
For realizing the late situation of closing of intake valve: at first pressure regulator valve action, set up oil pressure in the system pipeline, the Moving plate of distribution switchboard is with rotating with camshaft, certain appropriate moment when former intake valve is raised to peak and begins to land again, distribution switchboard is connected in-line, machine oil enters the hydraulic tappet assembly through pipeline, and this moment, the length of hydraulic tappet assembly increased, and produced an added lift and was superimposed upon on the former valve lift.When camshaft continued to rotate to former valve and closes, because the hydraulic tappet assembly is elongated, valve was not closed, and enters the intake valve pass stage in evening this moment.Camshaft turns over several angle again, and distribution switchboard is connected oil return circuit, and the machine oil in the hydraulic tappet assembly refluxes, and the hydraulic tappet assembly becomes original length again, valve-closing.So finish the adjustment of the interior intake valve of a distribution circulation pass in evening of motor.
For the situation that realizes that exhaust valve early leaves: at first pressure regulator valve action, set up oil pressure in the system pipeline, the Moving plate of distribution switchboard rotates with the gear that links to each other with camshaft, certain appropriate moment before former exhaust valve is opened, distribution switchboard is connected in-line, machine oil enters the hydraulic tappet assembly through pipeline, and this moment, the length of hydraulic tappet assembly was elongated, and exhaust valve is opened in advance.When camshaft continuation rotation, exhaust valve continues to open.Turn over several angle again at camshaft, distribution switchboard is connected oil return circuit, and the machine oil in the hydraulic tappet assembly flows out, and the hydraulic tappet assembly becomes original length again, and exhaust valve normally cuts out.So finish an adjustment that the interior exhaust valve of distribution circulation is early opened of motor.
The two-mode engine air valve correct-timing variable system of distribution switchboard control of the present invention leans against a distribution switchboard is installed in the oil circuit, leans on the break-make of distribution switchboard control oil channel and then realizes the control of valve timing.By the position and the size of careful adjustment distribution switchboard upper oil hole, can satisfy the requirement of the timing change of motor inlet and outlet, thereby adjust engines distribution to preferable states.
The two-mode engine air valve correct-timing variable system of distribution switchboard control of the present invention, can control the intake valve timing separately or control exhaust valve timing separately, or realize the adjustment of inlet and outlet door timing simultaneously, when realizing the adjustment of inlet and outlet door timing simultaneously, be provided with two distribution switchboards that link to each other with camshaft 6.
Claims (5)
1. the two-mode engine air valve correct-timing variable system of distribution switchboard control, include: hydraulic tappet assembly (8), the top of described hydraulic tappet assembly (8) one ends is pressed with valve rocker, the other end connects camshaft (6), described camshaft (6) is by engine-driving, it is characterized in that, also be provided with and drive hydraulic tappet assembly (8) flexible hydraulic driving system (10) and oil circuit distribution switchboard (5), described hydraulic driving system (10) is to drive hydraulic tappet assembly (8) by distribution switchboard (5), described camshaft (6) also connects distribution switchboard (5) and controls its conducting, described hydraulic driving system (10) includes: sump (1), the oil pump (2) of junctor fuel tank (1), drive the pump drive (3) of oil pump (2) and the pressure regulator valve (4) that is connected with oil pump (2), wherein, described pressure regulator valve (4) is also distinguished junctor fuel tank (1) and is passed through the oil-feed oil circuit connection hydraulic tappet assembly (8) of distribution switchboard (5), described sump (1) also is communicated with the oil return circuit of distribution switchboard (5), described distribution switchboard (5) includes: price fixing (52) and be the Moving plate (51) of running shaft with the center of price fixing (52) has most the oil-through holes (53) that are communicated with oil-feed oil circuit and oil return circuit respectively on the rotating locus of described price fixing (52) upper edge Moving plate (51).
2. the two-mode engine air valve correct-timing variable system of distribution switchboard according to claim 1 control is characterized in that, described oil pump (2) is a kind of in gear pump, plunger pump, rotor pump and the vane pump.
3. the two-mode engine air valve correct-timing variable system of distribution switchboard according to claim 1 control is characterized in that, described pump drive (3) is a kind of in motor, the mechanical driving structure.
4. the two-mode engine air valve correct-timing variable system of distribution switchboard control according to claim 1, it is characterized in that, the Moving plate (51) of described distribution switchboard (5) is to connect camshaft (6) by shaft joint (9), or is connected camshaft (6) by the gear that links to each other with camshaft (6), by arbitrarily with camshaft (6) have same rotational speed spool or gear be connected camshaft (6).
5. the two-mode engine air valve correct-timing variable system of distribution switchboard control according to claim 1, it is characterized in that, described system can control the intake valve timing separately or control exhaust valve timing separately, or realize the adjustment of inlet and outlet door timing simultaneously, when realizing the adjustment of inlet and outlet door timing simultaneously, be provided with two distribution switchboards that link to each other with camshaft (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101522732A CN101418709B (en) | 2008-10-09 | 2008-10-09 | Distribution plate controlled two-mode engine valve timing changing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101522732A CN101418709B (en) | 2008-10-09 | 2008-10-09 | Distribution plate controlled two-mode engine valve timing changing system |
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| Publication Number | Publication Date |
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| CN101418709A CN101418709A (en) | 2009-04-29 |
| CN101418709B true CN101418709B (en) | 2011-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101522732A Active CN101418709B (en) | 2008-10-09 | 2008-10-09 | Distribution plate controlled two-mode engine valve timing changing system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929365B (en) * | 2010-07-30 | 2012-07-04 | 天津大学 | Hydraulic self-adaption air valve correct-timing variable system of diesel engine and control method thereof |
| CN104295333B (en) * | 2013-07-16 | 2017-02-22 | 张珊 | Engine valve mechanism |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5289805A (en) * | 1992-03-05 | 1994-03-01 | Borg-Warner Automotive Transmission & Engine Components Corporation | Self-calibrating variable camshaft timing system |
| US5803029A (en) * | 1996-09-11 | 1998-09-08 | Toyota Jidosha Kabushiki Kaisha | Valve performance controller for internal combustion engine |
| CN101201009A (en) * | 2007-12-04 | 2008-06-18 | 天津大学 | Engine valve timing and lift continuously variable system |
| CN201284673Y (en) * | 2008-10-09 | 2009-08-05 | 天津大学 | Mechanical distribution type dual-mode engine air valve timing variable system |
-
2008
- 2008-10-09 CN CN2008101522732A patent/CN101418709B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5289805A (en) * | 1992-03-05 | 1994-03-01 | Borg-Warner Automotive Transmission & Engine Components Corporation | Self-calibrating variable camshaft timing system |
| US5803029A (en) * | 1996-09-11 | 1998-09-08 | Toyota Jidosha Kabushiki Kaisha | Valve performance controller for internal combustion engine |
| CN101201009A (en) * | 2007-12-04 | 2008-06-18 | 天津大学 | Engine valve timing and lift continuously variable system |
| CN201284673Y (en) * | 2008-10-09 | 2009-08-05 | 天津大学 | Mechanical distribution type dual-mode engine air valve timing variable system |
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| CN101418709A (en) | 2009-04-29 |
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