CN104420908B - A kind of drive mechanism for producing engine auxiliary valve motion - Google Patents
A kind of drive mechanism for producing engine auxiliary valve motion Download PDFInfo
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- CN104420908B CN104420908B CN201310371433.3A CN201310371433A CN104420908B CN 104420908 B CN104420908 B CN 104420908B CN 201310371433 A CN201310371433 A CN 201310371433A CN 104420908 B CN104420908 B CN 104420908B
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Abstract
A kind of drive mechanism for producing engine auxiliary valve motion, including stop mechanism, oil supply mechanism, spring mechanism, the valve bridge of engine, rocking arm, the first valve and duaspiracle, the connected driving piston hole of hydraulic channel and working piston hole are provided with valve bridge, an oilhole is provided with the valve bridge of working piston hole side, stop mechanism is arranged on above oilhole, and oil supply mechanism is to driving piston hole, working piston hole and hydraulic channel fuel feeding.The auxiliary boss of cam promotes driving piston, and driving piston is pushed the work forward piston by hydraulic connecting, and working piston, which down stretches out, opens a valve, produces auxiliary valve motion.When driving piston-actuated valve bridge to move downward and being separated with stop mechanism, the oilhole in valve bridge opens emptying, working piston is returned to retracted position, resets valve liter, and valve bridge drives two valves to produce conventional valve motion.The present invention is carried and reset valve liter using stop mechanism stop bit, is reduced height and weight, is added reliability and durability.
Description
Technical field:
It is particularly a kind of to produce hair the present invention relates to the valve actuation technology of mechanical field, more particularly to vehicle motor
The drive mechanism of motivation auxiliary valve motion.
Background technology:
The routine of engine（It is main）Valve motion is well-known to those skilled in the art, that is, the exhaust in engine
Stroke opens exhaust valve, and inlet valve is opened in the induction stroke of engine.In addition to conventional valve moves, engine also needs to
Auxiliary valve motion, such as the valve motion for engine braking, waste gas recycling and the startup and closing of engine.Start
The auxiliary valve motion of machine whether phase or size are all different from conventional valve motion.
Engine braking can be divided into compression-release braking and type braking of losing heart.
The compression-release braking of engine is to open exhaust valve in the later stage of engine piston compresses stroke, is rushed in expansion
The early stage of journey（Typically before exhaust valve is normally-open）Close exhaust valve.One precedent of compression-release brake is by Kang Ming
This (Cummins) discloses in nineteen sixty-five in U.S. Patent number 3220392.Its brakes passes mechanical input by hydraulic circuit
It is delivered to the exhaust valve to be opened.Reciprocating driving piston in driving piston hole is typically included on hydraulic circuit, this is reciprocal
Motion comes from the mechanical input of engine, such as the motion of engine injection cam or the motion of adjacent exhaust cam.Drive
The motion of piston is delivered to the working piston on hydraulic circuit by hydraulic fluid, it is back and forth transported in working piston hole
Dynamic, working piston is directly or indirectly acted on exhaust valve, produces the valve motion of engine braking running.
The discouraged type braking of engine is exhaust valve in addition to normal open, and keeps a small amount of permanent also in partial periodicity
(partial periodicity, which loses heart, to be braked) is opened, or (induction stroke, compression stroke, and expansion stroke) is protected within the cycle of non-exhaust stroke
A small amount of perseverances are held to open (complete period, which loses heart, brakes).The discouraged braking of partial periodicity and the main distinction of complete period discouraged braking, before being
Person does not open exhaust valve in most induction stroke.
The difference of the compression-release braking of engine and type braking of losing heart mainly has at 2 points.First main distinction is system
The open phase of dynamic exhaust valve（Braking time）It is different.The complete period braking exhaust valve of discouraged type braking is opened all the time, because
This does not involve the opening time.The opening time of the braking exhaust valve of the discouraged type braking of partial periodicity is the air inlet punching in engine
The later stage of journey；And compression-release braking braking exhaust valve opening time be in the later stage of the compression stroke of engine, than
The opening time of the braking exhaust valve of the discouraged type braking of partial periodicity wants evening a lot.Second main distinction is braking exhaust valve
Lift（Brake valve liter）It is different.
One precedent of engine complete period discouraged brakes is by Miao Er (Muir) in 1970 in U.S. Patent No.
No. 3525317 disclosures.Engine braking is divided into third gear by the brakes.First grade is that engine and each moving component of vehicle are made
Into friction loss and caused braking.Second gear is to keep continuous a small amount of perseverances to open and caused all-round the exhaust valve of engine
Phase, which loses heart, brakes.Third gear is the increase exhaust butterfly valve on the basis of the complete period discouraged braking of second gear, produces Associated brake.
The Volvo of Sweden（Volvo）In 1992 in U.S. Patent No. No. 5146890 disclose a kind of compression-release
The Associated brake method that engine brake is used together with exhaust brake.Wherein the brake cam of engine is released except compressing
Put outside braking boss, add exhaust gas recirculatioon（EGR）Boss.Exhaust valve is opened in the later stage of induction stroke, by exhaust brake
High back pressure tail gas caused by device（It is air during braking）, the reversely charging engine cylinder out of blast pipe, increase compression brake power.
The La Mo of German graceful (MAN)（Rammer）Equal to 1997 a kind of profit was disclosed in U.S. Patent No. 5692469
Improving exhaust back pressure with exhaust brake causes float valve（Valve bounces）And then the apparatus and method for opening the type brake that loses heart.When
When exhaust back pressure is sufficiently high, exhaust valve floats at the end of induction stroke is closed on and opens or bounce.During the exhaust valve floats, with one
Brake apparatus is intervened it, that is, before the floating exhaust valve closing opened, by the piston of an oil pressure cntrol by its
Stop, prevent it from closing, allow it to keep a small amount of perseverances to open, produce the discouraged braking of partial periodicity（Exhaust valve closes after exhaust stroke
Close）.The brakes is the engine for the single valve of every cylinder.2006, La Mo（Rammer）Extended Deng by above-mentioned technology
To the engine of the double valve of every cylinder（U.S. Patent No. 7013867, Chinese Patent No. 200310123153.7）.
The reliability and durability of the above-mentioned air-leakage type engine brakes of German graceful (MAN) are faced with many problems,
Because its interval opening or floating dependent on braking exhaust valve, this is all inconsistent on time and size.Many institutes
Known, the flying height of exhaust valve depends on exhaust back pressure, and exhaust back pressure depends on the rotating speed of engine, and by exhaust brake
The quality of device and control and the influence of exhaust system design.When in engine, slow-speed of revolution speed, the floating of exhaust valve may
Do not have not enough or at all, engine braking apparatus can not start.And now the demand of engine braking is very high, because commercial car is sent out
The motivation most of the time operate in, the slow-speed of revolution.The exhaust valve being braked in addition, too high exhaust back pressure not only floats, simultaneously
Also float not braking exhaust valve, and its seating velocity will be too big, influence the reliability and durability of engine.
The content of the invention：
It is an object of the invention to provide a kind of drive mechanism for producing engine auxiliary valve motion, described this drive
Motivation structure will solve the reliability of air-leakage type engine arrestment mechanism in the prior art and the undesirable technical problem of durability.
The drive mechanism of this generation engine auxiliary valve motion of the present invention, including a stop mechanism, a confession
Oil machine structure, a spring mechanism, the valve bridge of engine, the rocking arm of engine, the cam of engine, engine the first valve and
The duaspiracle of engine, wherein, the middle part upward opening of described valve bridge is provided with a driving piston hole, one end of valve bridge
It is downwardly open to be provided with a working piston hole, be provided between described driving piston hole and working piston hole one connection
Hydraulic channel, a driving piston is provided with driving piston hole inner sliding type, is provided with one working piston hole inner sliding type
Individual working piston, the upper end of described driving piston are connected with the rocking arm of described engine, the lower end of described working piston
It is connected with the first described valve, the downside of the other end of valve bridge is connected with described duaspiracle, the valve of working piston bottom hole
An oilhole is provided with bridge, described stop mechanism is fixedly connected with the stationary part of engine and in the upper of described oilhole
Hold exit adjacent with valve bridge, described oil supply mechanism is by oil supply gallery with driving piston hole, working piston hole and described
Hydraulic channel connects, and described spring mechanism includes a working spring, and described working spring upwardly biases working piston
Valve bridge one end where oilhole is pressed against below stop mechanism in working piston hole, and by working piston.
Further, described oil supply mechanism includes oil supply gallery and delivery valve, and described delivery valve is arranged on fuel feeding and led to
In road or between the oilhole that is arranged in oil supply gallery and valve bridge, described oil supply gallery passes through delivery valve and the oil in valve bridge
Hole connects with working piston hole.
Further, described delivery valve includes a stop bit current breaking mechanism, and described stop bit current breaking mechanism is according to fuel feeding
The distance between valve and valve bridge control the time of the working piston hole fuel feeding into valve bridge.
Further, one end of described working spring is placed on working piston, and the other end of working spring is placed in
On first valve.
Further, the cam of described engine includes engine regular motion boss and at least one produce aids in gas
The boss of door motion, the boss of described generation auxiliary valve motion is with described engine regular motion boss in phase and height
Had differences on degree.
Further, the engine raised a regular motion boss is provided with the cam of described engine, is raised
Distance with produce auxiliary valve motion boss height it is suitable.
Further, the boss of described generation auxiliary valve motion includes braking boss, and described braking boss promotes
One end of rocking arm, the driving piston that the other end of rocking arm is acted in the middle part of valve bridge, driving piston pass through described hydraulic channel shape
Into hydraulic connecting act on working piston, working piston acts on the first valve of engine, produced for engine braking
Valve motion.
Further, the boss of described generation auxiliary valve motion includes waste gas recycling boss, and described waste gas is again
One end that boss promotes rocking arm, the driving piston that the other end of rocking arm is acted in the middle part of valve bridge are circulated, driving piston passes through described
The hydraulic connecting that is formed of hydraulic channel act on working piston, working piston acts on the first valve of engine, produces use
In the valve motion of engines exhaust gas recirculation.
The present invention compares with prior art, and its effect is positive and obvious.Driving of the invention by auxiliary valve motion
Mechanism is integrated in inside the existing valve actuation chain of engine, and is undertaken partial brake load using stop mechanism and reset valve
Rise, design is simple, compact-sized, reduces the load of engine, adds the braking power of engine, improves engine fortune
The reliability and durability of work.
Brief description of the drawings：
Fig. 1 is that one embodiment of the drive mechanism of the generation engine auxiliary valve motion in the present invention is in "Off" position
The schematic diagram put.
Fig. 2 is that one embodiment of the drive mechanism of the generation engine auxiliary valve motion in the present invention is in "ON" position
The schematic diagram put.
Fig. 3 is at the delivery valve of one embodiment of the drive mechanism of the generation engine auxiliary valve motion in the present invention
Schematic diagram in retracted position.
Fig. 4 is at the delivery valve of one embodiment of the drive mechanism of the generation engine auxiliary valve motion in the present invention
In the schematic diagram of extended position.
Fig. 5 is the valve stroke of one embodiment of the drive mechanism of the generation engine auxiliary valve motion in the present invention
Schematic diagram.
Embodiment：
Embodiment:
Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5 are used for describing embodiments of the invention.
As depicted in figs. 1 and 2, the embodiment of the drive mechanism of generation engine auxiliary valve motion of the invention is located respectively
In "Off"（Oil supply mechanism oil-break）And "ON"（Oil supply mechanism fuel feeding）Position.Fig. 1 and Fig. 2 includes three main composition portions
Point：It is conventional（It is main）Valve actuator 200, valve 300（Including first valve 3001 and a duaspiracle 3002）And hair
Motivation auxiliary valve motion drive mechanism 100.
Valve actuator 200 includes cam 230, cam follower wheel 235, rocking arm 210 and valve bridge 400.Valve actuator
200 and valve 300 be combined and can be described as valve actuation chain.Generally in one end of rocking arm 210（Close to valve bridge 400 or close
Cam 230）With valve clearance governor motion.Valve clearance governor motion in the present embodiment is by being arranged on the rocking arm 210 of the side of valve bridge 400
Interior valve clearance adjusting screw 110 is formed, and valve clearance adjusting screw 110 is located on rocking arm 210 and fixed by lock nut 105.Valve clearance
Adjusting screw 110 is connected by pressure ball bar 113 with as foot pad 114.It is arranged on rocker arm shaft 205 swing type of rocking arm 210.Rocking arm
Oil leab 203, oil leab 204 and oil leab 115 etc. are provided with 210, with the oil leab 201 in rocker arm shaft 205 and
The grade of oil leab 202 connects.Oil leab 203, oil leab 204, oil leab 115, oil leab 201 and oil leab
Auxiliary oil channel in 202 composition main oil gallerys, with auxiliary valve motion drive mechanism distinguishes.Auxiliary oil channel such as oil duct 119 can be set
Put in stop mechanism 125, naturally it is also possible to which auxiliary oil channel and main oil gallery are arranged on routine in the lump（It is main）In rocking arm 210.
First valve 3001 and duaspiracle 3002 are respectively by valve spring 3101 and valve spring 3102（Abbreviation valve bullet
Spring 310）Overhead prevents gas between engine cylinder and blast pipe 600 on the valve seat 320 in engine cylinder-body 500
Flowing.The mechanical movement of cam 230 is passed to the first valve 3001 and duaspiracle by valve actuator 200 by valve bridge 400
3002, it is periodically opened and closed, produce conventional（It is main）Valve motion.
Auxiliary valve motion drive mechanism 100 includes casing, stop mechanism, oil supply mechanism and spring mechanism.The present embodiment
In casing use engine valve bridge 400.The central upward opening of valve bridge 400 is provided with a driving piston hole 415, valve bridge
400 one end is downwardly open to be provided with a working piston hole 190.Piston hole 415 and working piston hole 190 are driven by a liquid
Pressure passageway 412 is connected.The driving He of piston 162 is slidably provided with driving piston hole 415 and in working piston hole 190 respectively
Working piston 160.The upper end of driving piston 162 is connected by valve clearance governor motion with the rocking arm 210 of engine.Working piston
It is connected below 160 with producing the first valve 3001 of auxiliary valve motion.Below the other end of valve bridge 400 with engine
Duaspiracle 3002 is connected.An oilhole being in communication with the outside 197, oilhole 197 are provided with the valve bridge 400 of working piston bottom hole
A stop mechanism 125 is provided with the upside of the valve bridge at place.The casing 1251 of stop mechanism 125 can be fixed on appointing for engine
Above what resting position or part.Stop mechanism 125 includes oil supply mechanism and auxiliary valve clearance governor motion, including adjustable
Connector 1102 and connector 1142, fastener 1052 and delivery valve 172.Connector 1102 has one to be in communication with the outside above
Oil leak hole 196.A part for connector 1142 and delivery valve 172, contain check valve ball and oil supply gallery 1152 in it（Fuel feeding
Detail with reference Fig. 3 and Fig. 4 and subsequent descriptions of valve）.When cam 230 is in 225 position of basic circle, connector 1142 is located at work
Make on the valve bridge 400 of the top of piston hole 190 and close the outlet of oil duct 197.
The spring mechanism of auxiliary valve motion drive mechanism 100 includes a working spring 177.The one of working spring 177
End is placed on the first valve 3001, and the other end is placed on working piston 160, and working piston 160 is upwardly biased in valve bridge
In 400 working piston hole 190, and valve bridge 400 is pressed against to by working piston 160 lower end of stop mechanism 125, that is, connected
On part 1142.
A preloading spring 198 is provided between exhaust rocker arm 210 and engine.One end of preloading spring 198 is placed in hair
On one fixture of motivation, the other end is placed on rocking arm 210.Preloading spring 198 can be helical spring, flat spring and its
The spring of its form.Preloading spring 198 can also use different mounting means, be arranged on different places, for example driving
Between piston 162 and valve bridge 400, cam 230（Or the push rod of push rod engine）Between rocking arm 210 etc..Preloading spring 198
Keep the retracted position in driving piston hole 415 by driving piston 162（Fig. 1）With extended position（Fig. 2）In valve actuation chain
Inside generation gap 234, eliminate valve actuation chain inside not with amiable impact.
The routine of auxiliary valve motion cam and engine（It is main）Cam integrates, containing at least on the cam 230 integrated
One auxiliary valve motion boss and the conventional boss 220 after raising.Here the auxiliary valve motion boss of cam 230 includes
Compression release boss 233 and exhaust gas recirculatioon boss 232 on interior basic circle 225.
Alignment pin 142 is additionally provided with the side of driving piston hole 415 in valve bridge 400, limit is set on driving piston 162
Position groove 137, form piston limit mechanism, the maximum stroke of limitation driving piston 162.
When needing engine auxiliary valve motion, auxiliary valve motion controlling organization is opened（Do not show）, pass through fluid
Networking and oil supply mechanism, to the fuel feeding of auxiliary valve motion drive mechanism 100.Fluid network has numerous oil supply galleries, including only
Oil duct 119 in position mechanism casing 1251.Low-pressure oil passes through the fuel feeding machine being arranged in stop mechanism 125 from oil supply gallery
The delivery valve 172 and oilhole 197 of structure, to working piston hole 190, hydraulic channel 412 and the driving fuel feeding of piston hole 415.Driving is lived
Plug 162 moves on to extended position as shown in Figure 2 from retracted position as shown in Figure 1 in the driving piston hole 415 of valve bridge 400,
Piston 162 is driven with driving the bottom hole face 446 of piston hole 415（Namely valve bridge 400）Between gap 234 in be filled with machine
Oil, form hydraulic connecting.
When the auxiliary valve motion boss of cam 230（Compression release boss）During 233 rising past from interior basic circle 225, rocking arm
Driving piston 162 in 210 driving valve bridges 400 down shifts to the retraction position of driving piston hole bottom surface 446 from Fig. 2 extended position
Put（Fig. 1）, by the fluid for driving the hydraulic channel 412 between piston hole 415 and working piston hole 190（Machine oil）, will drive
Moving downward for piston 162 passes to working piston 160.Stop mechanism on the valve bridge 400 above working piston hole 190
125, valve bridge 400 is maintained to the state of geo-stationary, valve bridge 400 will not because the oil pressure in working piston hole 190 rises and
Move up.Working piston 160 in the working piston hole 190 of valve bridge 400 can only extend downwardly from, and opening is located at working piston
The first valve 3001 below 160, produce auxiliary valve motion（Such as the valve motion of engine braking）.
When the routine raised of integrated cam 230（It is main）From interior basic circle 225 toward when rising, rocking arm 210 drives boss 220
Driving piston 162 in valve bridge 400 down shifts to the retracted position of driving piston hole bottom surface 446 from Fig. 2 extended position（Figure
1）, by the fluid for driving the hydraulic channel 412 between piston hole 415 and working piston hole 190（Machine oil）, piston will be driven
162 move downward passes to working piston 160.Stop mechanism 125 on the valve bridge 400 above working piston hole 190,
Valve bridge 400 is maintained to the state of geo-stationary, valve bridge 400 will not be upward because the oil pressure in working piston hole 190 rises
It is mobile.Working piston 160 in the working piston hole 190 of valve bridge 400 can only extend downwardly from, and open and be located under working piston 160
First valve 3001 in face.
Enter the top for the conventional boss 220 raised in cam 230（Higher than auxiliary valve motion boss）When, driving is lived
The compressing driving piston hole of plug 162 bottom 446, driving valve bridge 400 moves downward.When valve bridge 400 and the stop mechanism in face disposed thereon
125（That is connector 1142）During separation, the oilhole 197 communicated in valve bridge 400 with working piston hole 190 opens emptying, and work is lived
Plug 160 is moved up to retracted position out of valve bridge 400 working piston hole 190 from extended position so that the routine raised is convex
The lift for the first valve 3001 that platform 220 generates is reset, and produces the shut-in time almost identical with duaspiracle 3002.
If the auxiliary valve motion boss of cam 230 also includes exhaust gas recirculatioon boss 232, then exhaust gas recirculatioon is convex
Platform 232 opens the process of the first valve 3001 by valve actuation chain, passes through valve actuation with above-mentioned compression release boss 233
The process that chain opens the first valve 3001 is identical, no longer repeats herein.
When not needing the auxiliary valve motion of engine, auxiliary valve motion controlling organization is closed（Do not show）, stop
To the fuel feeding of auxiliary valve motion drive mechanism 100.Enter in cam 230 after integrating and raise routine（It is main）The top of boss 220
（Higher than auxiliary boss）When, the driving compressing driving piston hole of piston 162 bottom 446, driving valve bridge 400 moves downward.When valve bridge 400
With the stop mechanism 125 in face disposed thereon（That is connector 1142）During separation, communicated in valve bridge 400 with working piston hole 190
Oilhole 197 opens emptying, and working piston 160 is moved up to retraction position out of valve bridge 400 working piston hole 190 from extended position
Put.The motion at the top of conventional boss 220 after valve bridge 400 will be raised passes to two valves 3001 and 3002, produces conventional gas
Door motion.During interior basic circle being returned at the top of conventional boss 220 of the cam 230 after raising into its bottom, work
Piston 160 is maintained at the retracted position shown in Fig. 1（Due to the upward active force of valve spring 3101）, drive piston 162 to keep
Inside the retracted position shown in Fig. 1, valve actuation chain（Between adjusting screw 110 and pressure ball bar 113）Form a gap 234.
Due to the gap 234, auxiliary valve motion boss（Such as compress release boss 233 and exhaust gas recirculatioon boss 232）Motion will
Valve 300 is not transferred to, the motion at the top of conventional boss 220 after only raising passes to valve 300, produces engine
It is conventional（It is main）Valve motion, the running of the auxiliary valve motion of engine are released from.
As shown in Figure 3 and Figure 4, the stop mechanism 125 of the drive mechanism of generation engine auxiliary valve motion of the invention
In oil supply mechanism delivery valve（Including connector 1142）Position in " retraction " and " stretching ".Except delivery valve, in figure
Oil supply mechanism also include oil supply gallery 114.The upstream of oil supply gallery 114 passes through fluid network and auxiliary valve motion control machine
Structure（Do not show）Connection.The downstream of oil supply gallery 114 passes through the oilhole 197 in delivery valve and valve bridge 400 and working piston hole 190
Connection（Fig. 1 and 2）.Here delivery valve（Including valve ball 172）It is arranged between oil supply gallery 119 and oilhole 197, naturally it is also possible to
It is arranged in oil supply gallery.
Here delivery valve includes stop bit current breaking mechanism, and its structure and operation principle are described below.Work as delivery valve（Connect
Part 1142）During in retracted position shown in Fig. 3, fluid（Machine oil）Fuel feeding can be passed through from auxiliary valve motion controlling organization
The oilhole 197 and working piston hole 190 that passage 114 and valve ball 172 are flowed into valve bridge 400.Work as delivery valve（That is connector 1142）
From the retracted position shown in Fig. 3 toward the extended position moved down into shown in Fig. 4（Valve bridge 400 moves down）When, the quilt of oil supply gallery 114
Partly blocked above connector 1142, delivery valve fuel cut-off, play a part of stop bit cutout.So stop bit here breaks
Mechanism is flowed according to delivery valve（Connector 1142）The distance between valve bridge 400 controls the fuel feeding of working piston hole 190 into valve bridge
Time.
Fig. 5 illustrates a kind of lift of exhaust valve in the drive mechanism of the generation engine auxiliary valve motion of the present invention
Curve (including auxiliary valve lifts curve 232v and 233v and typical wastegate lifting curve 220m or the conventional exhaust raised
Door lifting curve 220v) and inlet valve lifting curve 280v.The starting point that the conventional valve of engine exhaust port rises curve 220m is
225a, terminal 225b, its top lift are about 220b.Assuming that there is no oil duct on working piston hole 190 in valve bridge 400
197（Fig. 1 and Fig. 2）Rise and reset with the valve being generated by it, then routine during engine auxiliary valve motion by raising（It is main）Row
The routine raised caused by gas boss 220（It is main）The starting point that valve rises curve 220v is 225h, terminal 225c, its top lift
220e is 220a and 220b sums.Valve caused by oil duct 197, which rises, to be reset, and the valve of valve 3001 rises curve in the master raised
Valve rises transition point 220t between curve 220v bottom 220a and top 220b to routine（It is main）Valve rises curve 220m transition,
220s points rise curve 220m with main valve and merged, and are closed in terminal 225b, and the 225c risen than no valve when resetting greatly shifts to an earlier date.
When engine auxiliary valve motion operates, the auxiliary valve motion boss of cam（The He of exhaust gas recirculatioon boss 232
Compression release boss 233）Motion, by rocking arm 210 be transmitted to driving piston 162（Fig. 1 and Fig. 2）, drive the motion of piston 162 to lead to
The valve 3001 that the hydraulic connecting that hydraulic channel 412 is formed is transmitted to below working piston 160 and working piston 160 is crossed, produces row
The auxiliary valve motion valve of gas recycling rises 232v and the auxiliary valve motion valve of compression release rises 233v.Exhaust gas recirculatioon it is auxiliary
The starting point for helping valve motion valve liter 232v is 225d, positioned at the later stage of the induction stroke of engine, that is, the valve in inlet valve
When liter curve 280v is approached to turn off；The terminal that the auxiliary valve motion valve of exhaust gas recirculatioon rises 232v is 225e, positioned at hair
The early stage of the compression stroke of motivation.The starting point that the auxiliary valve motion valve of compression release rises 233v is 225f, positioned at engine
The later stage of compression stroke；The terminal that the auxiliary valve motion valve of compression release rises 233v is 225g, and the expansion positioned at engine is rushed
The early stage of journey.Valve rises curve and circulated between 0~720 °, and 0 ° and 720 ° is same point.
When the routine raised of integrated form cam 230（It is main）When exhaust boss 220 rises from interior basic circle 225 is past, rocking arm 210
Promote driving piston 162（Fig. 1 and Fig. 2）, driving piston 162 pushed the work forward piston 160 by hydraulic connecting, working piston 160
Valve 3001 is promoted to move downward.Enter the top for the conventional exhaust boss 220 raised in cam 230（Transported higher than auxiliary valve
Valve stroke caused by dynamic boss）When（Fig. 5）, drive piston 162 to start to drive valve bridge 400 to move downward.When valve bridge 400 is with stopping
Position mechanism 125（Delivery valve or connector 1142）During separation, oilhole 197 opens emptying, and working piston 160 moves on to from extended position
Retracted position, the valve liter of auxiliary valve motion valve 3001 are reset, and valve rises curve and curve is risen from transition point 220t to main valve
220m transition（Fig. 5）, finally closed in terminal 225b, the terminal 225c risen than no valve when resetting is significantly advanced.Thus subtract
The small lift of top dead center position of the valve in engine exhaust strokes, avoids the collision of valve and piston, also increases braking
Power, reduce the temperature of cylinder internal.
Described above discloses a kind of drive mechanism and method of new generation engine auxiliary valve motion.Above-mentioned reality
Apply mode, should not be construed so as to limit the scope of the present, but as some the specific illustrations for representing the present invention, it is many its
He develops and is likely to therefrom produce.For example, the drive mechanism and method of generation engine auxiliary valve motion here,
Overhead camshaft type engine is can be used not only for, is also applied for push rod engine；It can be used not only for driving exhaust valve, also fit
For driving inlet valve.Further, delivery valve 172 can use different forms, such as ball valve, column valve and dish valve.Delivery valve 172
Different positions can also be placed in, for example is placed in driving piston 162, machine oil is from rocker arm shaft, rocking arm, pressure ball bar and as foot
Pad and delivery valve enter driving piston hole.Due to the driving piston 162 in valve bridge 400（Pass through valve clearance governor motion）All the time with
Rocking arm 210 is close to, and delivery valve 172 can also be placed in the oil supply gallery of the top of driving piston 162, such as in rocking arm 210
Oil duct 204 or 115 in.In addition, driving piston 162 and working piston 160 can use different forms, such as " H " type and " T "
Type etc..Further, preloading spring 198 can have different forms and installed in different places, such as in working piston 162 and valve
Between bridge 400.
In addition, in addition to being used as casing by valve bridge 400, it is possibility to have other casing forms, such as rocking arm 210.Only
Will be when driving piston 162 to be slided in the driving piston hole of casing, casing is in the state of geo-stationary.Therefore, originally
The scope of invention should not be determined by above-mentioned specific illustration, but be determined by claim.
Claims (6)
1. it is a kind of produce engine auxiliary valve motion drive mechanism, including a stop mechanism, an oil supply mechanism, one
Spring mechanism, the valve bridge of engine, the rocking arm of engine, the cam of engine, the of the first valve of engine and engine
Two valves, it is characterised in that：The middle part upward opening of described valve bridge is provided with a driving piston hole, and one end of valve bridge is downward
Opening is provided with a working piston hole, and the hydraulic pressure of a connection is provided between described driving piston hole and working piston hole
Passage, a driving piston is provided with driving piston hole inner sliding type, is provided with a work working piston hole inner sliding type
Make piston, the upper end of described driving piston is connected with the rocking arm of described engine, the lower end of described working piston and institute
The first valve stated is connected, and the downside of the other end of valve bridge is connected with described duaspiracle, in the valve bridge of working piston bottom hole
An oilhole is provided with, described stop mechanism is fixedly connected with the stationary part of engine and brought out on described oilhole
Adjacent with valve bridge at mouthful, described oil supply mechanism connects with driving piston hole, working piston hole and described hydraulic channel, described
Spring mechanism include a working spring, described working spring upwardly biases working piston in working piston hole, and
Valve bridge one end where oilhole is pressed against below stop mechanism by working piston, described oil supply mechanism leads to including fuel feeding
Road and delivery valve, described delivery valve are arranged in oil supply gallery or between the oilhole being arranged in oil supply gallery and valve bridge,
Described oil supply gallery is connected by delivery valve with the oilhole in valve bridge and working piston hole, one end peace of described working spring
Put on working piston, the other end of working spring is placed on the first valve.
2. the drive mechanism of engine auxiliary valve motion is produced as claimed in claim 1, it is characterised in that：Described fuel feeding
Valve includes a stop bit current breaking mechanism, and described stop bit current breaking mechanism is controlled to valve bridge according to the distance between delivery valve and valve bridge
The time of interior working piston hole fuel feeding.
3. the drive mechanism of engine auxiliary valve motion is produced as claimed in claim 1, it is characterised in that：Described starts
The cam of machine includes engine regular motion boss and at least one boss for producing auxiliary valve motion, described generation auxiliary
The boss of valve motion has differences with described engine regular motion boss in phase and height.
4. the drive mechanism of engine auxiliary valve motion is produced as claimed in claim 3, it is characterised in that：Described starts
The engine raised a regular motion boss is provided with the cam of machine, the distance raised is with producing the convex of auxiliary valve motion
The height of platform is suitable.
5. the drive mechanism of engine auxiliary valve motion is produced as claimed in claim 3, it is characterised in that：Described generation
The boss of auxiliary valve motion includes braking boss, and described braking boss promotes one end of rocking arm, the other end effect of rocking arm
Driving piston in the middle part of valve bridge, the hydraulic connecting that driving piston is formed by described hydraulic channel act on working piston,
Working piston acts on the first valve of engine, produces the valve motion for engine braking.
6. the drive mechanism of engine auxiliary valve motion is produced as claimed in claim 3, it is characterised in that：Described generation
The boss of auxiliary valve motion includes waste gas recycling boss, and described waste gas recycling boss promotes one end of rocking arm, rocking arm
The driving piston that acts in the middle part of valve bridge of the other end, driving piston passes through the hydraulic connecting that described hydraulic channel is formed and acts on
In working piston, working piston acts on the first valve of engine, produces the valve motion for engines exhaust gas recirculation.
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| CN201310371433.3A CN104420908B (en) | 2013-08-22 | 2013-08-23 | A kind of drive mechanism for producing engine auxiliary valve motion |
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| CN201310371433.3A CN104420908B (en) | 2013-08-22 | 2013-08-23 | A kind of drive mechanism for producing engine auxiliary valve motion |
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| CN104420908B true CN104420908B (en) | 2018-01-26 |
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| CN106089348B (en) * | 2016-08-23 | 2018-10-16 | 潍柴动力股份有限公司 | A kind of air valve bridge and the engine including the air valve bridge |
| CN116816515B (en) * | 2023-08-25 | 2023-12-15 | 潍柴动力股份有限公司 | Valve lift switching control mechanism and valve system of engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101392667B (en) * | 2008-10-30 | 2013-02-27 | 杨柳 | Engine braking apparatus and method using single valve and bridge of valve |
| CN101769186B (en) * | 2009-01-05 | 2012-12-05 | 杨柳 | Engine braking device with double oil pressure control valves and method thereof |
| CN202140125U (en) * | 2010-02-26 | 2012-02-08 | 上海尤顺汽车部件有限公司 | Improved engine braking device |
| CN102261283B (en) * | 2010-05-27 | 2013-10-09 | 上海尤顺汽车部件有限公司 | Fixed chain-type engine brake device |
| CN102102559B (en) * | 2011-03-10 | 2014-09-24 | 奚勇 | Compression releasing engine braking method and device |
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