CN105020013A - Two-stroke/four-stroke internal combustion engine - Google Patents
Two-stroke/four-stroke internal combustion engine Download PDFInfo
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- CN105020013A CN105020013A CN201510328935.7A CN201510328935A CN105020013A CN 105020013 A CN105020013 A CN 105020013A CN 201510328935 A CN201510328935 A CN 201510328935A CN 105020013 A CN105020013 A CN 105020013A
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Abstract
The invention relates to a two-stroke/four-stroke internal combustion engine. A second cylinder of a piston type four-stroke internal combustion engine is changed into the two strokes, and a first cylinder and a third cylinder of the piston type four-stroke internal combustion engine are still four strokes. After the second cylinder with the two strokes is pushed by waste gas exhausted by the first cylinder and the third cylinder to work again, emptying discharging is carried out. The combination of the four strokes and the two strokes of the third cylinder can be achieved. According to the 4-2 stroke internal combustion engine, the work efficiency of fuel can be greatly improved, waste gas exhausting is reduced, and noise is lowered; and an internal combustion mechanism is optimized, construction labor and materials are saved, economic benefits of the enterprise are increased, and the oil consumption cost is reduced for a user.
Description
Technical field
The present invention relates to field of internal combustion engine, particularly relate to a kind of 2 stroke/4 stroke internal-combustion engine.
Background technique
Piston type four-stroke internal combustion engine is current automobile, boats and ships, engineering machinery and portable power source station, farm power machinery, self-powered's machine applications power engine the most widely.Its generally application has century-old many history, it has promoted progress of social civilization greatly, become the most powerful pillar industry of modern industrialization society, China has had several hundred million automobiles, year consumes several hundred million tons, oil, China's external oil dependency degree reaches 56% according to report, is the national economy great cause that government will put forth effort to make arrangements of.
Plug quartastroke engine in 1876 by the application of German's Otto patent of invention, within 1903, build up the production line of daily output 9000.From then on the rapid penetration and promotion of automobile, and constantly improve, become quick, comfortable, facilitate the magnificent traffic tool, the weight and alternative mule and horse carrys a load on the back.But the efficiency of vehicle fuel work done rests on the level of 33% over 100 years.The fuel oil of 33% becomes waste gas emptying discharge, and in addition 33% to scatter and disappear heat energy through wind, water cooling.Containing many pm2.5 particulates in discharging waste gas, float in an atmosphere, cause haze Hazard Meteorological, cover all the sky, ten thousand tracks are lost.The CO of a large amount of discharge
2produce greenhouse effect, improve the temperature of air, the water-vapo(u)r capacity of air is increased, and Cu-N brings downpour, and converge through surface runoff, flooding, debris flow sweeps away disaster area.Air also becomes merciless whirlpool, wrecks all earth's surfaces creature.
The energy-saving and emission-reduction of car combustion engine improve the automotive engineering that fuel efficiency is the suspending weight prize stimulating innovation of countries in the world government.China is by resources conservation, and energy-saving and emission-reduction, protection of the environment, makes laws as the strategic decision of national sustainable development.Within 2015, central authorities propose the policy that " millions of people are started an undertaking, popular innovation " promotes national economy normalization sustainable development, establish perspective long-term plan for realizing two China's a century dream.Facilitate 4-2 stroke IC engine to accelerate to select a good opportunity innovative design thus, wish for a bit tangible work is done by country.Change China and change by manufacturing big country the international status that is created big country into.
In view of above-mentioned defect, creator of the present invention obtains this creation finally through long research and practice.
Summary of the invention
The object of the present invention is to provide a kind of 2 stroke/4 stroke internal-combustion engine, in order to overcome above-mentioned technological deficiency.
For achieving the above object, the invention provides a kind of 2 stroke/4 stroke internal-combustion engine, it makes the second cylinder of piston type four-stroke internal combustion engine into two-stroke, and one, three cylinders remain four-stroke; The emptying discharge after work done again of the second cylinder two-stroke is promoted with the waste gas of one, three cylinders discharges; And three cylinder four-strokes, two stroke combination can be realized;
First and third cylinder does not arrange drain tap, and the second cylinder does not arrange air intake valve, and drain tap makes the opening and closing of two-stroke secondary into;
Internal-combustion engine is provided with three cylinders, at the first cylinder and the second cylinder and arrange a gas valve plunger respectively between the second cylinder and the 3rd cylinder, arranges oil nozzle in the centre of first and third cylinder; Gas transmission valve all-or-nothing piece is connected with in the lower end of each gas valve plunger;
Camshaft increases described gas transmission valve all-or-nothing piece,
The end of gas transmission valve all-or-nothing piece is connected with ratch lock gear, and ratch lock gear engages with band tooth pulley; Gas transmission valve all-or-nothing piece is when moving, and stroke is L, when gas transmission valve all-or-nothing piece moves to the terminal of stroke L, is locked by band tooth pulley; When cam axle is to toothless part, stop with the band tooth pulley on camshaft, close gas transmission valve.
Further, in the gas pipeline of cylinder head, be respectively arranged with a gas transmission valve, be also provided with oil pipe in the upside of cylinder head, the below of cylinder head is provided with crankcase, between cylinder head and crankcase, be provided with cylinder pad.
Further, be provided with the piston of corresponding each cylinder at described crankcase, wherein, the cylinder head portion that the second cylinder of centre is corresponding be provided with two gas pipelines, to there being two gas transmission valves.
Further, the lower end of two gas valves, to the camshaft that should have crankcase, gas transmission valve all-or-nothing piece is provided with sliding gear, sliding gear is provided with lock nut; Be connected with camshaft output gear in the end of camshaft, and the crankshaft-synchronous engaged with camshaft output gear clocks gear.
Further, before gas transmission valve opening, the outlet valve of the second cylinder should be closed, if trail 1-2ms.
Compared with prior art beneficial effect of the present invention is, 4-2 stroke IC engine of the present invention can increase substantially fuel oil work doing efficiency and reduce toxic emission, reduces noise, optimize internal combustion mechanism, save and build labor and materials, enterprise economic benefit, reduce user's oil consumption expense.
Accompanying drawing explanation
Fig. 1 is the structural representation of 2/4 stroke IC engine cylinder head of the present invention;
Fig. 2 is the sectional structure schematic diagram of 2/4 stroke IC engine cylinder head of the present invention;
Fig. 3 is the schematic diagram of crankshaft drive structure of the present invention;
Fig. 4 is the drive mechanism schematic diagram of ratch of the present invention locking pulley;
Fig. 5 is the circular chart of Diesel of the present invention.
Embodiment
Below in conjunction with accompanying drawing, to above-mentioned being described in more detail with other technical characteristics and advantage of the present invention.
The basic principle of 2/4 stroke IC engine of the present invention is: make the 2nd cylinder of original piston type four-stroke internal combustion engine into two-stroke, 1,3 cylinders remain four-stroke; The emptying discharge after work done again of the second cylinder 2 stroke is promoted with the waste gas of 1,3 cylinders discharges; And three cylinder four-strokes, two stroke combination can be realized.
The conventional structure of quartastroke engine is 4.6.8 cylinder cast solid, has shared a bent axle, by the up and down straight line motion of piston in cylinder, slides become circular movement through connecting rod commissure and bent axle, through rotating, controlling, export, drives motor racing.
Refer to shown in Fig. 1, it is the structural representation of 2/4 stroke IC engine cylinder head of the present invention, internal-combustion engine is provided with 3 cylinders 13, and at the 1st cylinder and the 2nd cylinder and arrange a gas valve plunger 11 respectively between the 2nd cylinder and the 3rd cylinder, the 1st, the centre of 3 cylinders arranges oil nozzle 13; Gas valve front tooth bar 35 is connected with in the lower end of each gas valve plunger 11.
Three cylinder 4-2 stroke IC engines are that the body of four cylinder four-stroke internal-combustion engine does following transformation, the 1st, 3 cylinders do not arrange drain tap, and the 2nd cylinder does not arrange air intake valve, and drain tap makes the opening and closing of two-stroke secondary into.4th cylinder makes 2 stroke compression pumps into, increases tolerance during air inlet.
In the gas pipeline 21 of cylinder head 24, be respectively arranged with a gas transmission valve 22, be also provided with oil pipe 23 in the upside of cylinder head 24, the below of cylinder head 24 is provided with crankcase 26, between cylinder head 24 and crankcase 26, be provided with cylinder pad 25.Be provided with the piston 27 of corresponding each cylinder at described crankcase 26, wherein, the cylinder head portion that the 2nd cylinder of centre is corresponding be provided with two gas pipelines 21, to there being two gas transmission valves 22.
Cylinder head withstands on cylinder cap and punches, milling near hole is put down, cushioning so as to install gas transmission valve and two cover gas valves opening and closing gearcase.
The lower end of two gas valves, to the camshaft 36 that should have crankcase, refers to shown in Fig. 3-4, gas transmission valve all-or-nothing piece 35 is provided with sliding gear 34, sliding gear 34 is provided with lock nut 33; Camshaft 36 increases described gas transmission valve all-or-nothing piece 35.Be connected with camshaft output gear 32 in the end of camshaft 36, and the crankshaft-synchronous engaged with camshaft output gear clocks gear 31.
The end of gas transmission valve all-or-nothing piece 35 is connected with ratch lock gear 51, and ratch lock gear 51 engages with band tooth pulley 52.Gas transmission valve all-or-nothing piece 35 is when moving, and stroke is L, when gas transmission valve all-or-nothing piece 35 moves to the terminal of stroke L, is locked by band tooth pulley 52; When camshaft 36 turns to toothless part, stop with the band tooth pulley 52 on camshaft 36, close gas transmission valve 22.
Band tooth pulley, effect is locking gas valve front tooth bar, maintains gas transmission valve opening, when be with tooth pulley rotation to gearless along time, band tooth pulley loses lock function, and ratch resets, and valve obturation, 1-2,3-2 cylinder is separated.
For preventing the loss of 1,3 cylinder power hot air flows, the outlet valve opening front 2nd cylinder at gas transmission valve 22 should be closed, if trail 1-2ms
1,3 cylinder gas valve optimal setting positions should between 1,3 cylinders and 2 cylinders between in cylinder head above wall, pipeline is the shortest, and heat-energy losses is minimum.
The acting process of 4-2 stroke IC engine:
The waste gas of four-stroke cylinder exhaust stroke discharge is one high-temperature high-pressure thermodynamic air-flow, has again the pump of piston to push away simultaneously.Current diesel engine utilizes the power of this discharging waste gas as the supercharging pumping forces of aspirating stroke using a small amount of.
Be exactly firearms automatic hull withdraws with the gas of combustion most typical dynamic power machine that is used as power of discharge, automatic loading, realizes continuous fire, and it is realized by piston cylinder assembly connecting rod.The tooth rock pneumatic pick of mining is a kind of special high-pressure pneumatic power tool.Also there is people's imagination pressurized air as the power of automobile, once manufactured experimently into model machine according to report.
Gas turbine is the maximum gas power machinery of boats and ships, also for aviation turbo-propeller.Aviation ramjet is also realize supersonic flight by the jet velocity of heat power air propels turbofan acceleration combustion gas.Be continuous spray fuel and air in the firing chamber of a unidirectional opening with internal-combustion engine unlike gas turbine, form continuous continual high-temperature high-pressure air flow.Piston is replaced with turbofan or turbine.The steam locomotive invented the earliest in 18th century is, with a special boiler, water boil is formed steam to several Baidu, then is transported to a piston cylinder assembly with insulated piping, and the Kai designing a set of valve member closes and drives wheel that train is run quickly.
4-2 stroke IC engine is exactly the rational innovation and application of practical experience of various air heat dynamic power machine.
According to the theory of aerothermodynami, combustion gas expands promotion piston in piston cylinder assembly combustion can work done A=p* Δ V.In the fundamental equation of this namely output work done of automobile, p represents combustion gas pressure, and Δ V represents the volume that piston cylinder assembly is promoted by combustion gas heat power to increase.Four-stroke machine is filled with high-temperature high-pressure thermodynamic air mass in Δ V volume of cylinder within the power stroke period, and promotes piston and push ahead vigorously to the lower dead center of cylinder, drives crankshaft rotating to export work done by connecting rod.When piston is advanced to the lower dead center of cylinder by the combustion gas group of scorching hot expansion, be then the exhaust valve open Kai of cylinder, by the power air mass emptying discharge in cylinder.Energy in this waste gas again reminding cylinder emptying to discharge equals the kinetic energy that automobile exports acting, i.e. A=p* Δ V.Just become waste gas once emptying discharge, used heat four diffusing is lost in atmosphere environment, becomes irretrievable waste.Therefore over more than 100 year, the energy of quartastroke engine toxic emission equals the energy that automobile exports acting.Actual use and measure prove that the fuel oil mechanical efficiency of automobile only has 33%, higher at last in gas engine.Combustion gas turbine is lower.
When the power stroke piston of 4-2 stroke IC engine first cylinder is advanced to lower dead center, the piston carry of adjacent second cylinder to the top dead center of cylinder, i.e. the air inlet node of the second cylinder.Now, 1st, the gas transmission valve opening instantaneously between the 2nd cylinder, the heat power air-flow of the first cylinder sprays into the second cylinder, because the parameter of two cylinders is equal, according to the dynamic (dynamical) theory of air heat: do not increasing the discharge volume of heat power air-flow, the heat energy of lost air-flow, namely the condition of adiabatic compression, burning, expansion is met, the pressure P2=P1.3 that the piston end surface of the second cylinder is subject to, therefore the piston of the second cylinder is pushed to the lower dead center of cylinder by the heat power air-flow that 1,3 cylinders spray into, as the power stroke of the first cylinder.Because the 1st, the 2nd cylinder is through piston rod, bent axle hinge, is in again positive feedback inertia motion state.Second cylinder piston is pushed to the lower dead center of cylinder, makes volume of cylinder produce one+Δ V increment.And the first cylinder is because of the output of high-pressure gas, cylinder internal air pressure is reduced, bent axle drives piston to promote to the top dead center of cylinder, makes volume of cylinder produce one-Δ V increment.Therefore the gas storage constant volume that first, second cylinder is total is constant.
Internal-combustion piston engine exports work done equation A=p. Δ V=f/s.s.h, derives and carrys out S: being piston end area, 2 π r
2; H is piston stroke.Therefore, when the first cylinder is to the second cylinder equipressure discharge power hot air flow, first and second cylinder piston is all h respectively to upper and lower promotion stroke, but total gas storage volume is invariable, and the merit A=p. Δ V therefore transmitted is constant.Three, two cylinder is also same reason.
In 4-2 stroke IC engine, second cylinder has that secondary height gas is thermodynamic to be washed away, and again without the absorbing and cooling temperature of the fresh air of first and third cylinder, therefore the operating temperature of the second cylinder may be close with first and third cylinder, if the 2nd cylinder working temperature has and is full of deficient, conveniently water can be set, air valve is regulated.
The present invention takes the lead in selecting diesel engine, and because former machine being arranged than being easier to, gasoline car machine prolongs for the time being afterwards.Describing according to general physics aerothermodynami, the circular chart of Diesel.AE section is the intake and exhaust stroke of normal temperature and pressure, and AB section is adiabatic compression process, the air that sucks in coordinate B point cylinder is compressed to 30 ~ 35 barometric pressure, and gas temperature rises to that to catch fire when spraying into fuel oil that to light BC section be power stroke be acting process.The feature of Diesel engine diesel combustion can more slowly drop under level pressure expands to burn.Stop oil spout when oil jetting combustion arrives C point, but under plug cock is subject to the swelling pressure of hot gas, continue cylinder to push ahead vigorously to lower dead center, therefore the volume of Diesel engine working cycle diagram cylinder constantly increases, the CD radian line segment of generation adiabatic expansion.
The pressure of cylinder combustion gas during terminal D and temperature because of the expansion of volume of cylinder, fuel gas temperature pressure drop.There is very large drop to thermodynamic potential energy that is obvious during D point and BC section, the requirement that 4-2 stroke machine the 2nd cylinder does work again can not be met.
4-2 stroke machine second cylinder is not oil spout, by 1,3 cylinders discharge heat power air-flow to the propelling movement pressure work done of 2 cylinder pistons.Therefore must extend 1,3 cylinder injection times makes BC elongated segment line and AD prolonged section intersect at H point.The High Temperature High Pressure air mass extending 1,3 cylinder power stroke fuel injection internal combustions generations compensate for CDH gable, increases falling of the internal cylinder temperature pressure caused because only having volume of cylinder without gas compensation.
1st, the pressure of 3 cylinders when the power hot air flow that H point exports to the second cylinder and tolerance just rise to the level of BC section potential energy, make the energy of the acting of the second cylinder reach the identical value of 1,3 cylinders.Ensure (1-2), (3-2) stroke smooth running of 4-2 stroke machine, the key point of Di Sai work cycle that Here it is, adjustment.What is adjusted? adjust the plunger Injection Pump of diesel engine.Accomplish than being easier to.
The confidential fuel injection internal combustion time lengthening of 4-2 stroke, to H point, also requires to increase when aspirating stroke to suck air quantity simultaneously.4-2 stroke machine reduces by half because of air displacement, and used air intake pressurized pump is short of power certainly, need to be cross-linked to drag with belt pulley with main shaft.Automobile supplements after maybe can be used the air-filtering of brake gas cylinder.
4-2 stroke IC engine be with three cylinder-piston assemblies for assembly of elements, compare four cylinder four-stroke machine and reduce by a cylinder-piston assembly.1,3 cylinders are that four assemblies arrange intake valve, and respectively arrange gas valve to 2 cylinders, the 2nd cylinder arranges outlet valve.Inlet and outlet valve arrangement can be identical with original structure, and gas valve will be opened on time, durable in use, needs well-designed.4-2 machine unit is totally five valves, reduces by three valves than four cylinder four-stroke machine.
Camshaft forges possibly again, because the position of cam will be readjusted.Because the wheel air valve in anticipation has certain Kai to close stroke " L ", for accelerating when opening Kai, therefore 10 times to be accelerated in start bit.Camshaft and the intrinsic rotating ratio 2: 1 of main shaft.Therefore take turns air valve open Kai initial to add 1: 5 choosing wheel box.
The exhaust of 4-2 stroke machine 1,3 cylinder to the 2nd cylinder is isobaric discharge, and be different from the emptying discharge of four-stroke machine, the nest that can not drain cylinder dome firing chamber remains waste gas, the instantaneous gas bleeder valve that specialized designs one links, (as 1-2ms).Regulate the work cycle of Diesel, filled up expanding without combustion gas of CDH and increased emptily volume, add the gas power of the 2nd cylinder input, but pressure has caused a problem.Require that 1,3 cylinders are to the gas valve of 2 cylinders, before and after H point, accurately must open switching, and require that 4-2 stroke operates reliably in batch production, this is a difficult point.How high the precision that gas valve is opened is, does some estimation below: establish engine RPM=1000-1500, every one-stroke lasts 30 ~ 20ms, suitable crankshaft rotating 180 °, 6 °/ms ~ 9 °/ms.The track of piston bent axle interaction is a positive escapement functional equation, represents with right angled coordinates
X＝R(θ-sinθ).dx/dθ＝R+cosθ
Y＝R(1-cosθ).dy/dθ＝-sinθ
Y is equivalent to the stroke of piston, R π node equals the H point that diesel cycle working drawing regulates, volume of cylinder biggest place variable Δ y increment is minimum, if the suitable piston stroke 15.6% of RMP=1500.9 °/ms, because engine main shaft band movable valve camshaft speed increasing ratio is 1: 2, if the step-up gear of cam driven one 1: 5, pull gas valve front tooth bar, open Kai gas transmission valve plug, the speed being equivalent to valve plug improves 10 times, dy/d θ=sin θ=15.6%.θ is equivalent to 1 °, because escapement line Δ y value changing value near node R π is very little.The opening angle of gas valve can be regulated 1 °-0.5 °, to ensure to meet isobaric 1,3 cylinders to the reliable discharge of 2 cylinders.
The Performance Evaluation of 4-2 stroke machine
1. energy-conservation: to save fuel oil 50% than four cylinder four-stroke;
2. reduce discharging: reduce toxic emission 50%.
3. save engine and manufacture labor and materials 1/4.
4. maximum advantage can the production line of the existing automobile making of universal succession.
The foregoing is only preferred embodiment of the present invention, is only illustrative for invention, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes in the spirit and scope that invention claim limits to it, amendment, even equivalence, but all will fall within the scope of protection of the present invention.
Claims (5)
1. a 2 stroke/4 stroke internal-combustion engine, is characterized in that, it makes the second cylinder of piston type four-stroke internal combustion engine into two-stroke, and one, three cylinders remain four-stroke; The emptying discharge after work done again of the second cylinder two-stroke is promoted with the waste gas of one, three cylinders discharges; And three cylinder four-strokes, two stroke combination can be realized;
First and third cylinder does not arrange drain tap, and the second cylinder does not arrange air intake valve, and drain tap makes the opening and closing of two-stroke secondary into;
Internal-combustion engine is provided with three cylinders, at the first cylinder and the second cylinder and arrange a gas valve plunger respectively between the second cylinder and the 3rd cylinder, arranges oil nozzle in the centre of first and third cylinder; Gas transmission valve all-or-nothing piece is connected with in the lower end of each gas valve plunger;
Camshaft increases described gas transmission valve all-or-nothing piece,
The end of gas transmission valve all-or-nothing piece is connected with ratch lock gear, and ratch lock gear engages with band tooth pulley; Gas transmission valve all-or-nothing piece is when moving, and stroke is L, when gas transmission valve all-or-nothing piece moves to the terminal of stroke L, is locked by band tooth pulley; When cam axle is to toothless part, stop with the band tooth pulley on camshaft, close gas transmission valve.
2. 2 stroke/4 stroke internal-combustion engine according to claim 1, it is characterized in that, in the gas pipeline of cylinder head, be respectively arranged with a gas transmission valve, be also provided with oil pipe in the upside of cylinder head, the below of cylinder head is provided with crankcase, between cylinder head and crankcase, is provided with cylinder pad.
3. 2 stroke/4 stroke internal-combustion engine according to claim 2, it is characterized in that, be provided with the piston of corresponding each cylinder at described crankcase, wherein, the cylinder head portion that second cylinder of centre is corresponding is provided with two gas pipelines, to there being two gas transmission valves.
4. 2 stroke/4 stroke internal-combustion engine according to claim 1, is characterized in that, the lower end of two gas valves, to the camshaft that should have crankcase, gas transmission valve all-or-nothing piece is provided with sliding gear, sliding gear is provided with lock nut; Be connected with camshaft output gear in the end of camshaft, and the crankshaft-synchronous engaged with camshaft output gear clocks gear.
5. 2 stroke/4 stroke internal-combustion engine according to claim 1, is characterized in that, before gas transmission valve opening, the outlet valve of the second cylinder should be closed, if trail 1-2ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510328935.7A CN105020013A (en) | 2015-06-16 | 2015-06-16 | Two-stroke/four-stroke internal combustion engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510328935.7A CN105020013A (en) | 2015-06-16 | 2015-06-16 | Two-stroke/four-stroke internal combustion engine |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4202300A (en) * | 1978-02-22 | 1980-05-13 | Frank Skay | Internal combustion engine |
| US4237832A (en) * | 1977-09-06 | 1980-12-09 | Bayerische Motoren Werke Aktiengesellschaft | Partial-load control apparatus and method and for internal combustion engines |
| CN2649786Y (en) * | 2003-08-06 | 2004-10-20 | 张胜利 | Secondary expansion piston internal combustion engine |
| CN1580515A (en) * | 2003-08-06 | 2005-02-16 | 张胜利 | Double expansion piston-type IC engine |
| CN202866918U (en) * | 2012-09-28 | 2013-04-10 | 长城汽车股份有限公司 | Variable valve stroke mechanism of engine |
-
2015
- 2015-06-16 CN CN201510328935.7A patent/CN105020013A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4237832A (en) * | 1977-09-06 | 1980-12-09 | Bayerische Motoren Werke Aktiengesellschaft | Partial-load control apparatus and method and for internal combustion engines |
| US4202300A (en) * | 1978-02-22 | 1980-05-13 | Frank Skay | Internal combustion engine |
| CN2649786Y (en) * | 2003-08-06 | 2004-10-20 | 张胜利 | Secondary expansion piston internal combustion engine |
| CN1580515A (en) * | 2003-08-06 | 2005-02-16 | 张胜利 | Double expansion piston-type IC engine |
| CN202866918U (en) * | 2012-09-28 | 2013-04-10 | 长城汽车股份有限公司 | Variable valve stroke mechanism of engine |
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