CN104903552B - Exhaust valve device and method for the closing that controls exhaust valve - Google Patents
Exhaust valve device and method for the closing that controls exhaust valve Download PDFInfo
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- CN104903552B CN104903552B CN201380069506.1A CN201380069506A CN104903552B CN 104903552 B CN104903552 B CN 104903552B CN 201380069506 A CN201380069506 A CN 201380069506A CN 104903552 B CN104903552 B CN 104903552B
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- Prior art keywords
- exhaust valve
- piston
- fluid chamber
- closing
- effluent
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Classifications
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- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
-
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
- F01L1/16—Silencing impact; Reducing wear
-
- 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
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- 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
- F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
- F01L9/12—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
- F01L9/14—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem the volume of the chamber being variable, e.g. for varying the lift or the timing of a valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0207—Variable control of intake and exhaust valves changing valve lift or valve lift and timing
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- 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
- F01L2013/0089—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 with means for delaying valve closing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Include the force transfer mechanism (2,3,14,19) being arranged between cam (1) and exhaust valve (13) for the exhaust valve device of piston engine.Hydraulic fluid can be introduced into fluid chamber (4) during the open movement of exhaust valve (13).Piston (7) is arranged in fluid chamber (4) and is connected to force transfer mechanism (2,3,4,19).By controlling the effluent from fluid chamber (4), the closing velocity of the exhaust valve (13) can control.The effluent from the fluid chamber (4) is allowed to be in following speed, the speed allows the closing curve of the exhaust valve (13) to follow cam curve, and certain preset distance has been moved along closing direction at least up to the exhaust valve (13).
Description
Technical field
The present invention relates to the exhaust valve device for piston engine.The invention further relates to piston-engined for controlling
The method of the closing of exhaust valve.
Background technology
Many internal combustion engines are provided with the device that (VIC) is closed for variable intake valve, so allow for making internal combustion engine
Different IC Intake Valve Closes timings can most preferably be used.Recently, the other arrangements for closing (VEC) for variable exhaust valve have become
More commonly.In the engine using two turbocharging, VEC arrangements are particularly useful.It is right when boost pressure can be high
In different loads, it is necessary to carry out different scavengings.When engine is run under high load, in order to cool down the group of engine
Part, it is necessary to the scavenging time it is long.Therefore, during exhaust stroke, exhaust valve keeps opening for a long time.On the other hand, when starting
When machine is run under a low load, pressure of the pressure less than exhaust of air inlet.In order to prevent from discharge duct flows into admission line,
Need while inlet valve is opened or slightly after this, close exhaust valve.Including for being cooled down again by injecting water
In the engine of the device of cycle gas, variable exhaust valve closure timings is also useful.When with water injection, it is not necessary to enter
Valve and exhaust valve are overlapping, but if needing to close water injection, then in order to allow under full load situation operation hair thing, it is necessary to
Longer scavenging.Generally, VEC cloth is realized by using the chamber between exhaust valve and the cam for operating exhaust valve is arranged in
Put.Exhaust valve is opened by cam in a conventional manner.During the open movement of exhaust valve, hydraulic fluid is introduced into chamber
In.The close moment and closing velocity of exhaust valve depend on the effluent from chamber.For example, outflow can be prevented by using valve
Thing closes delay to provide.The problem of this solution, is that in case of a system failure, the closing of exhaust valve may
It is prevented from, and piston may collide exhaust valve, cause extensive damage.
The content of the invention
It is an object of the invention to provide a kind of improved exhaust valve device for piston engine, described device allows to prolong
Exhaust valve described in close later, but prevent the piston slap exhaust valve of engine.It is a further object to provide for controlling
The improved method for making the closing of piston-engined exhaust valve.
The apparatus according to the invention includes：At least one exhaust valve；Rotatable cam；Force transfer mechanism, it is used for institute
State the rotary motion transformation linear movement of cam and pass the linear movement along at least opening direction of the exhaust valve
It is delivered to exhaust valve；Fluid chamber, hydraulic fluid can be incorporated into fluid chamber during the open movement of the exhaust valve；It is living
Plug, it is arranged in the fluid chamber and is connected to the force transfer mechanism or the exhaust valve；At least one outlet,
It is used to discharge the hydraulic fluid to allow to close the exhaust valve from the fluid chamber；And flowing controlling organization, its
For controlling the effluent of the fluid chamber and allowing to slow down or postpone the closedown campaign of the exhaust valve.The outlet
The effluent from the fluid chamber is configured to allow for the flowing controlling organization and is in following speed, and the speed allows
The closing curve of the exhaust valve follows cam curve, and necessarily pre- has been moved along closing direction at least up to the exhaust valve
Set a distance.
In the method according to the invention, during the open movement controlled by cam of the exhaust valve, by flow of pressurized
Body introduces fluid chamber, and controls the effluent from the fluid chamber, to influence the motion of piston and allow to slow down
Or the closedown campaign of the delay exhaust valve, the piston be arranged in the fluid chamber and be connected to the exhaust valve or
It is connected to positioned at the force transfer mechanism between cam and the exhaust valve.The effluent from the fluid chamber is allowed to be in down
Speed is stated, the speed allows the closing curve of the exhaust valve to follow cam curve, at least up to the exhaust valve along closing
Certain preset distance is moved in direction.
Wording " closing curve " means the lift changed with the change of crankangle of exhaust valve.Wording " cam curve " is anticipated
Refer to the motion changed with the change of crankangle of cam follower.When without use delay feature and by cam shape Lai
When determining the lift of exhaust valve, the closing curve of exhaust valve is therefore corresponding to cam curve.With the apparatus according to the invention and side
Method, can postpone or slow down the closing of exhaust valve, and the piston of engine does not hit the risk of exhaust valve.When exhaust valve starts to close
When closing motion, the effluent from fluid chamber is unrestricted.Only after exhaust valve has moved certain distance, just flow
Go out the throttling of thing.Determine the distance so that the exhaust valve lift of throttling start time is less than being located at for top dead center engine
The distance between exhaust valve of piston and closing in respective cylinder.Therefore the closing curve of exhaust valve first corresponds to bent in cam
Line, but after throttling is started, close slope of a curve can not as good as cam curve slope steepness.
There is the alternative of many effluents of the control from fluid chamber.For example, the piston in fluid chamber can quilt
It is arranged to throttle to flowing.The diameter of the end of piston is smaller than the remainder of piston.When exhaust valve is opened completely,
The outlet of fluid chamber is also opened completely.When piston has moved preset distance, it covers one or more outlets, and
And allow the effluent from fluid chamber by forming the small―gap suture between piston and the wall of fluid chamber.
Another selection is to provide the fluid chamber with two or more outlets, and these outlets are in different height
Degree, i.e. different from the distance of the end of fluid chamber.When exhaust valve is opened completely, all outlets are also opened completely.Work as work
When plug has moved preset distance, at least one outlet that it blocks in outlet, and therefore limit effluent.In outlet
Some outlets or the discharge line that is connected with outlet is settable choke valve.These choke valves can be adjustable.Also
Some outlets or pipeline that can be given in outlet provide valve, and the valve allows to adjust effluent.
Brief description of the drawings
Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings, wherein：
Fig. 1 shows the exhaust valve opening mechanism with VEC functions,
Fig. 2 shows exhaust valve device according to the embodiment of the present invention,
Fig. 3 shows second embodiment of the present invention,
Fig. 4 shows third embodiment of the present invention,
Fig. 5 shows the 4th embodiment of the present invention,
Fig. 6 shows the 5th embodiment of the present invention,
Fig. 7 shows the valve lift when disabling VEC functions, and
Fig. 8 shows the valve lift when enabling VEC functions.
Embodiment
According to the exhaust valve device of the present invention particularly suitable for large combustion engines (such as, in the sustainer or auxiliary of steamer
Engine is used to produce the engine of electric power in power station).Present invention is particularly useful for the hair with two turbocharging
Motivation is neutralized in the engine that water cooling is carried out using EGR gas.However, the device can be additionally used in other types of start
Machine.
Figure 1 illustrates the example of the valve opening mechanism of exhaust valve 13.In this case, each cylinder of internal combustion engine is set
There is more than one exhaust valve 13, exhaust valve opening mechanism can be used for all exhaust valves 13 of one cylinder of control.The cloth of exhaust valve 13
Put in cylinder head 18, for opening and closing the fluid communication between the cylinder 16 of internal combustion engine and discharge duct 17.Spring 15
Around the bar for being arranged in exhaust valve 13, to keep it to be to close when exhaust valve 13 is not actuated.Valve opening mechanism is provided with
VEC functions for the closing of delayed exhaust door 13.Valve opening mechanism includes the cam 1 of the part as camshaft.Cam 1
It is provided with basic circle 1a and the salient angle 1b extended radially outwards from basic circle 1a.The cam follower wheel 2a of cam driven unit 2 is consistently
Engage cam 1.The device is settable spring, and cam follower wheel 2a is overlayed cam 1 by spring.The opening of exhaust valve 13 is with tradition
Mode works.When cam follower wheel 2a becomes to engage the salient angle 1a of cam 1, cam driven unit 2 pushed away from the rotation of cam 1
Axle, i.e. upward direction in Fig. 1.The part of the formation force transfer mechanism 2,3,14,19 of cam driven unit 2, the transmission of these power
The rotary motion of cam 1 is changed linear movement by mechanism, and this motion further is delivered into exhaust valve 13.Power transmits machine
Structure also includes the first push rod 3, the second push rod 19 and rocking arm 14.First push rod 3 is with cam driven unit 2 at least in exhaust valve 13
Mechanical Contact in opening direction.Second push rod 19 is connected to rocking arm 14.The motion of second push rod 19 is delivered to exhaust by rocking arm 14
Door 13.In addition, the force transfer mechanism of many other types can be used.For example, the part of power bang path can be hydraulic pressure.
In order to slow down or delayed exhaust door 13 closedown campaign, valve opening mechanism is provided with fluid chamber 4, in exhaust valve
During 13 open movement, hydraulic fluid can be introduced into fluid chamber 4.Fluid chamber 4 is connected to entrance by inlet port 5a
Pipeline 5.Hydraulic fluid can be introduced into fluid chamber 4 by inlet duct 5 and inlet port 5a.The device is also provided with two
Or more inlet port 5a and/or enter pipeline 5.Pipeline 5 is provided with check-valves 6, check-valves 6 allows flow into fluid chamber
In 4 but do not allow to flow out chamber 4.It is settable into pipeline 5 as the replacement of check-valves 6, or as the supplement of check-valves 6
There is closure valve, closure valve, which is used for selectivity, to be allowed or prevent in incoming fluid chamber 4.Closure valve allows to enable and disables VEC work(
Energy.If closure valve is closed, do not allow flow into fluid chamber 4, and disable VEC functions.Valve Unclosing structure is then
To be worked with conventional cam control exhaust valve opening mechanism identical mode.Fig. 7 shows the valve lift when disabling VEC.It is cloudy
Shadow zone represents the overlapping of exhaust valve and inlet valve.Piston 7 is arranged in fluid chamber 4.Piston 7 limits the border of fluid chamber 4
And hydraulic fluid is introduced between piston 7 and the cam shaft end of fluid chamber 4.In the embodiment of figure 1, piston 7 is connected
To the first push rod 3 and the second push rod 19, i.e. piston is located between the first push rod 3 and the second push rod 19.First push rod 3 is in exhaust
The motion of cam driven unit 2 is delivered to piston 7 in the opening direction of door 13, and the second push rod 19 is by the motion of piston 7
It is delivered to rocking arm 14.However, fluid chamber 4 and piston 7 can also be set by many other modes.In principle, fluid chamber 4 can cloth
Put in cylinder cover 18 and piston 7 may be connected to the bar of exhaust valve 13, but this is unpractical.However, piston 7 can be connected
To some other parts of the force transfer mechanism in addition to the first push rod 3 and the second push rod 19.Piston 7 is always with exhaust valve 13
Move together.
When cam follower wheel 2a becomes to engage the salient angle 1a of cam 1, piston 7 is moved with the first push rod 3.If closed
Valve closing is opened, then by the motion of piston 7, and hydraulic fluid is sucked in fluid chamber 4 from into pipeline 5.First push rod 3 with
Cam driven unit 2 is remained engaged with.When cam 1 rotates so that cam follower wheel 2a engagement salient angles 1a top, exhaust valve
13 are fully opened.When cam follower wheel 1a enters salient angle 1a decline chute, exhaust valve 13 is begun to shut off.When exhaust valve 13
When beginning to shut off motion, exhaust valve 13 follows cam curve first.By limiting the effluent from fluid chamber 4, exhaust valve
Closing velocity can be slowed down.In fig. 8, it is shown in solid lines the lift of exhaust valve 13 and is shown in broken lines cam curve.It is cloudy
Shadow zone domain representation exhaust valve 13 and inlet valve it is overlapping.
Figure 2 illustrates a kind of arrangement of the effluent of the fluid chamber 4 of valve opening mechanism of the limitation from Fig. 1.
In Fig. 2 embodiment, fluid chamber 4 is provided with an outlet 8 and the discharge line 9 being connected with outlet 8.Outlet 8
It is sized with discharge line 9 so that be enough to allow piston 7 to start to close in exhaust valve 13 by the Peak Flow Rate of outlet 8
Cam curve is followed when closing motion.When exhaust valve 13 and piston 7 have been moved specifically in advance on the closing direction of exhaust valve 13
During set a distance, piston 7 starts to throttle to the effluent of fluid chamber 4.This occurs to be in discharge in the cam shaft end of piston 7
During the height (that is, in the stage 3 of Fig. 2) of mouth 8.Diameter at the cam end in the piston 7 of piston 7 is slightly less than piston 9
The diameter of remainder.Piston 7 therefore no completely plugged outlet 8, but the shape between piston 7 and the wall of fluid chamber 4
Into small―gap suture.Hydraulic fluid can flow to outlet 8 by this gap.However, being throttled so that piston 7 can not be with
With cam driven unit 2.Therefore piston 7 can work and slow down the closing velocity of exhaust valve 13 as flowing controlling organization,
So that gap is formed between the first push rod 3 and cam driven unit 2, as shown in Fig. 2 stage 4.It can such as see in fig. 8
, the closing slope of a curve of exhaust valve 13 is steep not as good as cam curve, and when cam follower wheel 2a has been returned to cam 1
Continue the closedown campaign of exhaust valve 13 during basic circle 1a.The Duration Ratio disabling VEC of scavenging time situation is long.When piston 7 connects
During the cam shaft end of nearly fluid chamber 4, the thicker part point of piston 7 partly blocks outlet 8, as shown in Fig. 2 stage 5.
Therefore the closing velocity of exhaust valve 13 further reduces, so as to allow smoothly to close.Finally, fluid chamber 4 be drained and
First push rod 3 becomes to re-engage with cam driven unit 2, as can be seen in Fig. 2 stage 6.Piston 7 can have more than two
Individual different-diameter, to allow the closing velocity of exhaust valve 13 gradually to change, or the diameter of piston 7 can infinitely reduce.
Figure 3 illustrates another embodiment of the invention.The operating principle of this embodiment and Fig. 1 embodiment party
It is identical in formula.In addition, in the layout in figure 3, during the open movement of exhaust valve 13, hydraulic fluid is introduced into fluid chamber 4
In, and piston 7 as flowing controlling organization work.When cam follower wheel 2a enters the salient angle 1a of cam 1 decline chute
When, exhaust valve 13 can be moved freely first.Fluid chamber 4 is provided with first discharge port 8a, the second outlet 8b and the 3rd row
Export 8c and corresponding discharge line 9a, 9b and 9c.Second outlet pipeline 9b is provided with valve 10, and valve 10 can be used for preventing
Flow into the second discharge line 9b.Valve 10 works as additional flowing controlling organization.Motion is begun to shut off in exhaust valve 13
When, hydraulic fluid can flow out fluid chamber by all outlet 8a, 8b, 8c.Outlet 8a, 8b, 8c and discharge line 9a,
9b, 9c are sized so that when first discharge port 8a and the 3rd outlet 8c is idle, it is bent that exhaust valve 13 can follow cam
Line.Even if which ensures that the second discharge line 9b valve 10 is closed, can also realize enough closing velocities.When piston 7
When having moved certain distance, it blocks first discharge port 8a and limits the effluent from fluid chamber 4.When piston 7 is transported
When moving with closer to the cam shaft end of fluid chamber 4, piston 7 also blocks the second outlet 8b, and hydraulic fluid only can pass through the 3rd
Outlet 8c flows out fluid chamber 4.Which ensures that exhaust valve 13 is smoothly closed.Valve 10 in second discharge line 9b can
For preventing from flowing through the second outlet 8b earlier.
In the embodiment illustrated in fig. 4, the device is provided with two outlets 8a, 8b and discharge line 9a, 9b.In exhaust valve
13 when beginning to shut off motion, hydraulic fluid can by first discharge port 8a and the first discharge line 8b and the second outlet 9a and
Second discharge line 9b flows out fluid chamber 4.Outlet 8a, 8b and discharge line 9a, 9b are sized so that work as outlet
When 8a, 8b are opened, exhaust valve 13 can follow cam curve.After piston 7 has moved certain distance, it blocks first row
Export 8a and limit effluent.Second discharge line 9b is provided with adjustable throttling 11, and choke valve 11 is as additional flowing control
Mechanism processed equally works.With choke valve 11, different closing curves can be achieved.Choke valve 11 can also be used to be limited in exhaust valve 13
Terminate there are more effluents during closedown campaign, to ensure steady closing.
Fig. 5 embodiment is similar to Fig. 4 embodiment.In this embodiment, second outlet pipeline 9b does not have
Choke valve is set, but the second discharge line 9b is connected to second chamber 12, and cam driven unit 2 is arranged in second chamber 12
Middle motion.When cam follower wheel 2a is located on the salient angle 1b of cam 1, cam driven unit 1 blocks the second discharge line 9b's
The other end.When exhaust valve 13 begins to shut off motion, hydraulic fluid can free to pour out fluid chamber by first discharge port 8a
4.First discharge port 8a and the first discharge line 9a are sized so that be enough to allow row by first discharge port 8a flow velocity
Valve 13 follows cam curve.When exhaust valve 13 has moved certain distance on the closing direction of valve 13, piston 7 is blocked
First discharge port 8a.It is therefore prevented that having effluent from fluid chamber 4.When cam follower wheel 2a enters the basic circle 1a of cam 1,
The second outlet 8b is allowed fluid to flow into second chamber 12.However, the emptying of fluid chamber 4 does not occur immediately,
Therefore the closing of exhaust valve 13 has delay.
In addition, Fig. 6 shows that the wherein device is provided with two outlets 8a, 8b and discharge line 9a, 9b embodiment.
Second discharge line 9b is provided with rapid-closure damper 10, and rapid-closure damper 10 may, for example, be electronic or hydraulic operation.
First discharge port 8a and the first discharge line 9a are sized so that be enough to allow exhaust by first discharge port 8a flow velocity
Door 13 follows cam curve.Which ensures that, also can be sufficient in the case of the second discharge line 9b valve 10 is idle
Fluid chamber 4 is emptied fast enough.When exhaust valve 13 begins to shut off motion, it is allowed to which the effluent from fluid chamber 4 passes through
Both one outlet 8a and the second outlet 8b.After piston 7 has moved certain distance, piston 7 blocks first discharge port 8a
And only allow effluent to pass through the second outlet 8b.Valve 11 in second discharge line 9b flows through second row available for control
8b is exported, to realize required exhaust valve closing curve.As the arrangement of safety, fluid chamber 4 is settable the 3rd discharge pipe
Road, when cam follower wheel 2a is located on the basic circle 1a or salient angle 1b of cam 1, prevents there is pipeline stream in the 3rd discharge line
It is dynamic.For example, the other end of the 3rd discharge line can be blocked by cam driven unit 2.The profile of cam 1 is additionally provided with positioned at cam
Part below 1 basic circle 1a.When cam follower wheel 2a enters the part below basic circle 1a, it is allowed to flow through the 3rd discharge pipe
Road.By this arrangement, in the case that the valve 11 in the second discharge line 9b breaks down, fluid cavity is also ensured that
The emptying of room 4 and the closing of exhaust valve 13.
In all embodiments of description, the throttling of effluent is only occurred in and is turned off after exhaust valve 13, this foot
To prevent the piston slap exhaust valve 13 of cylinder 16.When starting throttling, exhaust valve lift therefore less than top dead center piston and
The distance between exhaust valve 13 of closing, as seen in Fig. 7 and Fig. 8, Fig. 7 and Fig. 8 also illustrate fortune of the piston ring around top dead-centre
It is dynamic.
In all of the embodiments of the present invention of description, it is determined that can be after which to the effluent from fluid chamber 4
The preset distance throttled so that prevent connecing between exhaust valve 13 and the piston being located in respective cylinder of internal combustion engine
Touch.The lift of the exhaust valve 13 of correspondence position is therefore less than the exhaust valve 13 and internal combustion engine closed when piston is in top dead-centre
The distance between each piston.
It should be appreciated by those skilled in the art, the invention is not restricted to above-mentioned embodiment, but can be in model of the invention
Enclose interior change.For example, the feature of different embodiments can be combined.
Claims (12)
1. a kind of exhaust valve device for piston engine, wherein, the exhaust valve device includes：At least one exhaust valve
(13)；Rotatable cam (1)；Force transfer mechanism (2,3,14,19), it is used for the rotary motion of the rotatable cam (1)
Change linear movement and the linear movement is at least delivered to the exhaust along the opening direction of the exhaust valve (13)
Door (13)；Fluid chamber (4), hydraulic fluid can be introduced in the fluid cavity during the open movement of the exhaust valve (13)
In room；Piston (7), it is arranged in the fluid chamber (4) and is connected to the force transfer mechanism (2,3,14,19) or institute
State exhaust valve (13)；At least one outlet (8,8a, 8b, 8c), it is used to discharge the flow of pressurized from the fluid chamber (4)
Body is to allow to close the exhaust valve (13)；And flowing controlling organization (7,10,11), it is used to control to come from the fluid cavity
The effluent of room (4) and allow to slow down or postpone the closedown campaign of the exhaust valve (13), the outlet (8,8a, 8b,
8c) effluent from the fluid chamber (4) is configured to allow in following with the flowing controlling organization (7,10,11)
Speed, the speed allows the closing curve of the exhaust valve (13) to follow cam curve, at least up to the exhaust valve (13)
Along close direction moved certain preset distance, it is characterised in that the effluent from the fluid chamber (4) not by
Throttling, until the exhaust valve (13) has moved the preset distance, and has been moved in the exhaust valve (13) described
After preset distance, the effluent is throttled, and the preset distance be determined to be so that, start throttling when valve
Door lift be less than the piston-engined piston (7) described in top dead center with closing the exhaust valve (13) between away from
From.
2. the exhaust valve device according to claim 1 for piston engine, it is characterised in that the preset distance quilt
It is determined that into the correspondence position caused in the exhaust valve (13), the exhaust valve (13) is located at respective cylinder with the engine
In piston between contact be prevented from.
3. the exhaust valve device according to claim 1 or 2 for piston engine, it is characterised in that the fluid cavity
The piston (7) in room (4) is arranged to, to from institute after the exhaust valve (13) has moved the preset distance
The effluent for stating fluid chamber (4) is throttled.
4. the exhaust valve device according to claim 1 or 2 for piston engine, it is characterised in that the fluid cavity
Room (4) includes at least two outlets (8,8a, 8b, 8c), and the piston (7) has been arranged in the exhaust valve (13)
At least one outlet blocked after the preset distance in the outlet (8,8a, 8b, 8c) is moved.
5. the exhaust valve device according to claim 4 for piston engine, it is characterised in that the outlet (8,
8a, 8b, 8c) at least one outlet or be connected with the outlet (8,8a, 8b, 8c) discharge line (9,9a, 9b,
9c) it is provided with choke valve (11).
6. the exhaust valve device according to claim 5 for piston engine, it is characterised in that the choke valve (11)
It is adjustable.
7. the exhaust valve device according to claim 4 for piston engine, it is characterised in that the outlet (8,
8a, 8b, 8c) at least one or the discharge line (9,9a, 9b, 9c) that is connected with the outlet (8,8a, 8b, 8c) set
There is valve (10).
8. one kind is used for the method for controlling the closing of piston-engined exhaust valve (13), in the process, in the exhaust
Hydraulic fluid is introduced into fluid chamber (4) during the open movement controlled by cam of door (13), and controls to come from the stream
The effluent of fluid chamber (4), is transported with the closing for influenceing the motion of piston (7) and allow to slow down or postpone the exhaust valve (13)
Dynamic, the piston (7) is arranged in the fluid chamber (4) and is connected to the exhaust valve (13) or is connected to positioned at cam
(1) force transfer mechanism (2,3,14,19) between the exhaust valve (13), in the process, it is allowed to from the fluid
The effluent of chamber (4) is in following speed, and the speed allows the closing curve of the exhaust valve (13) to follow cam curve, extremely
Less until the exhaust valve (13) has moved certain preset distance along closing direction, it is characterised in that not to from described
The effluent of fluid chamber (4) is throttled, until the exhaust valve (13) has moved the preset distance, and
The exhaust valve (13) has been moved after the preset distance, and the effluent is throttled, and by the pre- spacing
Cause from determining into, valve lift when starting throttling is less than the piston-engined piston (7) described in top dead center with closing
The distance between described exhaust valve (13) closed.
9. the method according to claim 8 for being used to control the closing of piston-engined exhaust valve (13), its feature exists
In at least one outlet (8,8a, 8b, 8c) for blocking the fluid chamber (4) by using the piston (7) is described to limit
Effluent.
10. the method according to claim 8 for being used to control the closing of piston-engined exhaust valve (13), its feature exists
In after the exhaust valve (13) has moved the preset distance, being throttled by using the piston (7) to flowing
Limit the effluent.
11. the method according to claim 8 for being used to control the closing of piston-engined exhaust valve (13), its feature exists
In being throttled by using at least one choke valve (11) to flowing and limit the effluent, the choke valve (11) is by cloth
It is set to and is connected with the outlet of the fluid chamber (4) (8,8a, 8b, 8c) or discharge line (9,9a, 9b, 9c).
12. the method according to claim 8 for being used to control the closing of piston-engined exhaust valve (13), its feature exists
In, limit the effluent with least one valve (10), the valve (10) be arranged to outlet (8,8a, 8b,
8c) or discharge line (9,9a, 9b, 9c) connection.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20135003 | 2013-01-03 | ||
| FI20135003A FI20135003L (en) | 2013-01-03 | 2013-01-03 | Drain valve device and method for checking closure of a drain valve |
| PCT/FI2013/051204 WO2014106681A1 (en) | 2013-01-03 | 2013-12-27 | Exhaust valve arrangement and method for controlling closing of an exhaust valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104903552A CN104903552A (en) | 2015-09-09 |
| CN104903552B true CN104903552B (en) | 2017-11-03 |
Family
ID=49943384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380069506.1A Active CN104903552B (en) | 2013-01-03 | 2013-12-27 | Exhaust valve device and method for the closing that controls exhaust valve |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2941545B1 (en) |
| KR (1) | KR102192961B1 (en) |
| CN (1) | CN104903552B (en) |
| FI (1) | FI20135003L (en) |
| WO (1) | WO2014106681A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9506382B2 (en) | 2015-03-30 | 2016-11-29 | Caterpillar Inc. | Variable valve actuator |
| CN105781661B (en) * | 2016-03-14 | 2018-04-03 | 潍柴动力股份有限公司 | Engine intake valve backhaul controllable device and the air distribution system provided with the device |
| JP2022133567A (en) | 2021-03-02 | 2022-09-14 | エスケーマテリアルズジェイエヌシー株式会社 | polycyclic aromatic compound |
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| KR20010050388A (en) * | 1999-09-13 | 2001-06-15 | 한센 존 스텐달 | A hydraulically actuated exhaust valve for an internal combustion engine |
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| US3678906A (en) * | 1970-12-04 | 1972-07-25 | Ford Motor Co | Damped valve train system |
| DE4134657A1 (en) * | 1991-10-19 | 1992-09-17 | Daimler Benz Ag | Valve closing motion damper for IC engine - consists of braking cylinder, formed in cylinder head housing, and whose piston acts against valve end of rocker lever |
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| ATE418670T1 (en) * | 2003-05-08 | 2009-01-15 | Caterpillar Motoren Gmbh & Co | VARIABLE VALVE CONTROL DEVICE |
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| JP5011816B2 (en) * | 2006-05-15 | 2012-08-29 | いすゞ自動車株式会社 | Variable valve drive |
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| FI124107B (en) * | 2006-06-30 | 2014-03-14 | Wärtsilä Finland Oy | Piston Engine Gas Exchange Valve Control Arrangement and Method for Controlling a Piston Engine Gas Exchange Valve |
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- 2013-01-03 FI FI20135003A patent/FI20135003L/en not_active Application Discontinuation
- 2013-12-27 CN CN201380069506.1A patent/CN104903552B/en active Active
- 2013-12-27 KR KR1020157020820A patent/KR102192961B1/en active IP Right Grant
- 2013-12-27 WO PCT/FI2013/051204 patent/WO2014106681A1/en active Application Filing
- 2013-12-27 EP EP13818759.6A patent/EP2941545B1/en active Active
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| JPH02221609A (en) * | 1989-02-22 | 1990-09-04 | Honda Motor Co Ltd | Valve system of internal combustion engine |
| KR20010050388A (en) * | 1999-09-13 | 2001-06-15 | 한센 존 스텐달 | A hydraulically actuated exhaust valve for an internal combustion engine |
| CN1666011A (en) * | 2002-07-05 | 2005-09-07 | 沃尔沃拉斯特瓦格纳公司 | Apparatus for an internal combustion engine |
| EP1831507A1 (en) * | 2004-11-04 | 2007-09-12 | Schaeffler KG | Variable valve drive of an internal combustion engine |
| CN101509402A (en) * | 2008-02-14 | 2009-08-19 | 曼狄赛尔公司 | Exhaust valve actuator for large-scale two-stroke diesel engine |
| CN102472130A (en) * | 2009-07-07 | 2012-05-23 | 瓦锡兰芬兰有限公司 | A control arrangement for an inlet valve in a piston engine |
Also Published As
| Publication number | Publication date |
|---|---|
| KR102192961B1 (en) | 2020-12-18 |
| CN104903552A (en) | 2015-09-09 |
| FI20135003L (en) | 2014-07-04 |
| EP2941545A1 (en) | 2015-11-11 |
| KR20150102118A (en) | 2015-09-04 |
| WO2014106681A1 (en) | 2014-07-10 |
| EP2941545B1 (en) | 2016-11-23 |
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