CN102817666A - Air valve executing device applying auxiliary cam to drive - Google Patents
Air valve executing device applying auxiliary cam to drive Download PDFInfo
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- CN102817666A CN102817666A CN2012103304866A CN201210330486A CN102817666A CN 102817666 A CN102817666 A CN 102817666A CN 2012103304866 A CN2012103304866 A CN 2012103304866A CN 201210330486 A CN201210330486 A CN 201210330486A CN 102817666 A CN102817666 A CN 102817666A
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Abstract
The invention relates to an air valve executing device applying an auxiliary cam to drive and comprises a venting rocker arm, an auxiliary rocker arm and a rocker arm shaft. The auxiliary rocker arm comprises a rocker arm device, an oil hole device and a valve hole device. The valve hole device comprises a rocker arm shaft hole, a driven valve hole, a control valve hole and a one-way valve hole, the rocker arm shaft is provided with an oil path device, and the venting rocker arm and the auxiliary rocker arm are arranged on the rocker arm shaft in an adjacent mode. An auxiliary cam is added on a cam shaft of an engine, and the auxiliary cam drives the auxiliary rocker arm to rotate around the rocker arm shaft through an auxiliary rocker arm rolling wheel. At a position where the air valve executing device works and is around a stop of an engine compression stroke, the driven valve hole of the auxiliary rocker arm is filled with engine oil to compensate a reserved air valve gap, the lift effect of the auxiliary cam drives the auxiliary rocker arm to open a venting door, and accordingly engine brake or internal exhaust gas recirculation (EGR) is performed. By means of the air valve executing device applying the auxiliary cam to drive, when engine oil pressure in the rocker arm is oversize, engine in the driven vale hole can flow out in time, pressure is reduced, and normal work service life of the engine is long.
Description
Technical field
The present invention relates to a kind of valve mechanism actuating device; Be specifically related to a kind of being applied on the DENG; A kind of valve actuating device that auxiliary cam drives of using is provided, realizes the system of the auxiliary lift of valve, be particularly useful for engine braking and internal EGR function.
Background technique
DENG is mainly as the power source of commercial car.When DENG was made positive work, in 360 ° of (720 ° of crankshaft rotating) processes of camshaft rotation, motor was accomplished air inlet, compression, acting and four work cycle of exhaust.When compression stroke finished, fuel oil sprayed in the cylinder and burns, externally acting in expansion stroke subsequently.On the DENG camshaft, generally include intake cam and exhaust cam, intake cam is opened intake valve in aspirating stroke get in the cylinder air, and exhaust cam is used to open exhaust valve the waste gas of burning is discharged cylinder in exhaust stroke.
Development along with technology; DENG is except that satisfying as the required performance index of car load power source; Also need further satisfy the requirement of car load auxiliary braking system and the emission regulation demands of increasingly stringent; Obviously reduce the discharging of motor NOx (many nitrogen oxidess) such as gas recirculation system (Exhaust Gas Recirculation is called for short EGR) The Application of Technology, the engine braking The Application of Technology promotes car load auxiliary braking performance effectively.
The engine braking technology is meant that the resistance that produces when utilizing the motor operation comes the effectively control speed of a motor vehicle; Engine braking is through the fall holder of automobile to motor; Utilize Engine Mechanical loss, pumping loss and compression work etc. to produce braking function, thereby increase automobile brake power.Three kinds of the engine braking technology is divided into Compression Engine braking, lose heart formula engine braking and part are lost heart formula engine brakings.The Compression Engine braking is near the compression stroke top dead center, to open exhaust valve or auxiliary valve; The formula engine braking that loses heart is to open exhaust valve in whole engine cycles; The disappointing formula engine braking of part is to open exhaust valve at most of stroke of engine cycles.The engine braking The Application of Technology reduces the frequency of utilization of Service Brake effectively; Car load is when precipitous road surfaces such as lower long slope, rugged hill path; Use engine braking, can avoid causing the temperature of brake bush to raise because of the long-time break that uses; Braking force is descended, in addition ineffective.
EGR is a technology that is used to reduce discharging of extensive use on DENG at present.During engine positive power, open one or more intake valves in aspirating stroke, fuel and air get into cylinder; Comprise oxygen and a large amount of nitrogen in the air, at expansion stroke, oxygen and fuel combustion; The acting of promotion piston, the comburant temperature sharply raises simultaneously, and nitrogen is inert gas; Be not easy oxidation, but temperature is high to a certain degree, still can form NOx.Therefore if will reduce the amount of nitrogen oxides in the exhaust, just must manage to reduce the FT in the cylinder.The mainstream technology that reduces NOx at present is exactly in suction tude, to import some waste gas that burnt; Mix with fresh air; Make it to burn once more, effect is the oxygen concentration that reduces mixed gas, absorbs the heat that burning discharges, and makes that velocity of combustion slows down, FT reduces; Just reduced the generation quantity of NOx, the EGR gas recirculation system has all been arranged no matter modern engine is petrol engine or diesel engine.
Usually, egr system is divided into two kinds of internal EGR and outside EGR, and outside EGR is meant that waste gas enters into intake manifold through exterior line by gas exhaust manifold.Outside egr system is arranged an EGR valve between gas exhaust manifold and intake manifold.Internal EGR system is to open exhaust valve in aspirating stroke, makes waste gas get into the firing chamber.
The actuating device of valve mechanism can provide one or a plurality of auxiliary valve lift, is used to realize internal EGR and engine braking function.A kind of valve actuating device of the prior art mainly comprises a support; Arrange one or several internal oil passages on the support; In the active valve opening and driven valve opening that aggressive valve and servo valve are rack-mount, aggressive valve can be slided in the active valve opening, and servo valve can slide in driven valve opening; Initiatively valve opening and driven valve opening are communicated with by the oil circuit on the support, and whether electromagnetic valve oil circuit fuel feeding in support.When the engine valve actuating device was worked, machine oil got into the hydraulic circuit on the support, because the incompressibility of machine oil, servo valve can not slide in driven valve opening, under the driving of auxiliary lift on the camshaft, opened valve.During cancellation auxiliary valve lift, machine oil can flow out by the oil circuit on support.Another kind of valve actuating device can realize that this form has been avoided increasing the motor whole height and increasing engine weight behind the application support through relevant component are integrated in the rocking arm.
Two kinds of above-mentioned valve actuating devices do not have over-voltage protecting function; When needs are opened the auxiliary valve lift; If inner pressure of air cylinder is too high; Valve is in opening process, and the contact stress between valve actuating device stress excessive and cam and roller driven member is excessive, causes damage of components easily.
Summary of the invention
To above-mentioned defective, the purpose of this invention is to provide a kind of simply, valve actuating device efficiently, to solve the technical problem of existing technology.
For realizing above-mentioned purpose, the technological scheme below the present invention has adopted:
A kind of valve actuating device of using the auxiliary cam driving comprises exhaust rocker arm, auxiliary rocker arm and pitman arm shaft, and said auxiliary rocker arm comprises rocker arrangement, oilhole device and valve opening device; Said valve opening device comprises rocker shaft hole, driven valve opening, control valve bore and unidirectional valve opening, on the said pitman arm shaft oil circuit device is installed, and exhaust rocker arm and auxiliary rocker arm are arranged adjacent each other on the pitman arm shaft; In addition; On the camshaft of motor, increase an auxiliary cam, said auxiliary cam drives auxiliary rocker arm through the auxiliary rocker arm roller and rotates around pitman arm shaft, near the work of valve actuating device, engine compresses stroke top dead center; Be full of machine oil in the driven valve opening of auxiliary rocker arm; The valve clearance is reserved in compensation, and the lift effect of auxiliary cam drives auxiliary rocker arm and promotes sliding pin and make exhauxt valve opens, carries out engine braking; When the engine charge stroke, the lift effect of auxiliary cam drives auxiliary rocker arm and promotes sliding pin and make exhauxt valve opens, carries out internal EGR.
According to the described a kind of valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention, when said auxiliary rocker arm is not worked at the valve actuating device, do not influence the motion of exhaust valve.
According to the described a kind of valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention, adjustment bolt, stop collar, driven spring, back-up ring and servo valve are installed in the said driven valve opening.
According to the described a kind of valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention, installation and control valve, control valve return spring and oil drain valve in the said control valve bore.
According to the described a kind of valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention, one-way valve and one-way valve return spring are installed in the said unidirectional valve opening, and on the outer surface of auxiliary rocker arm, are realized sealing by interior hexagonal pyramidal plug screw.
According to the described a kind of valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention; Said control valve comprises first upper-end surface, second upper-end surface and lower end surface; The diameter of second upper-end surface is greater than the diameter of lower end surface, and low pressure oil acts on first upper-end surface of said control valve, and high pressure oil acts on second upper-end surface and lower end surface of said control valve simultaneously; High pressure oil acts on pressure on second upper-end surface greater than the pressure that acts on the lower end surface; When pressure difference acted on the power on first upper-end surface greater than low pressure oil, said control valve moved upward, and high pressure oil gushes from oil drain valve.
According to the described a kind of valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention, said camshaft also comprises cam, and cam is connected with exhaust rocker arm, and the cam drive exhaust rocker arm is realized exhaust stroke; Auxiliary cam comprises peach and basic circle two-part.
According to the described a kind of valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention; The front end of auxiliary rocker arm comprises convexity, piston, baffle ring and spring; Said convexity, piston, baffle ring and spring are fixed on the camshaft support; Piston is pressed to convexity under the effect of spring, convexity is pressed to auxiliary cam with auxiliary rocker arm makes auxiliary rocker arm contact with auxiliary cam.
According to the described a kind of valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention, said sliding pin is installed on the air valve bridge, and the shoulder in sliding pin hole is connected on the shoulder in the middle of the sliding pin and the air valve bridge.
Owing to adopted above technical characteristics, make the present invention than existing technology, have following advantage and good effect:
The first, the present invention uses the lift effect of auxiliary cam to drive auxiliary rocker arm and makes exhauxt valve opens, and carries out engine braking or internal EGR, longer service life simple in structure;
The second, the present invention is flowed out the machine oil in the driven valve opening when the engine oil pressure in the rocking arm is excessive in good time, and pressure discharges motor proper functioning long service life;
Three, the present invention is not when needing the work of valve actuating device, and the engine oil pressure in the rocking arm reduces, and the machine oil in the driven valve opening flows out, and pressure discharges motor proper functioning long service life.
Certainly, any one specific embodiment of embodiment of the present invention content might not have above whole technique effect simultaneously.
Description of drawings
Fig. 1 is valve actuating device that auxiliary cam the drives sectional view when not working;
Fig. 2 be auxiliary cam drive the work of valve actuating device the time sectional view;
Fig. 3 is the side view of Rocker arm assembly;
Fig. 4 is the decomposition view of Rocker arm assembly;
Fig. 5 is the front elevation of the valve actuating device of auxiliary cam driving;
Fig. 6 is the rear view of the valve actuating device of auxiliary cam driving;
When Fig. 7 is the motor proper functioning, each part position figure in control valve bore and the unidirectional valve opening;
When Fig. 8 is the valve actuating device work of auxiliary cam driving, each part position figure in control valve bore and the unidirectional valve opening;
When Fig. 9 is the motor proper functioning, the key plan of second kind of one-way valve structures in unidirectional valve opening;
When Figure 10 is the valve actuating device work of auxiliary cam driving, the key plan of second kind of one-way valve structures in unidirectional valve opening;
Figure 11 is second kind and drives the torsion spring structural drawing that auxiliary rocker arm is pressed to camshaft;
Figure 12 is the detailed view of control valve.
Embodiment
Technical program of the present invention lies in: the oil circuit device on the pitman arm shaft 3 has lubricating oil path 301 and control oil channel 302; Exhaust rocker arm 1 is arranged adjacent each other on the pitman arm shaft 3 with auxiliary rocker arm 2; Can the rocker shaft hole of installing around pitman arm shaft 201 be arranged on the auxiliary rocker arm 2 around pitman arm shaft 3 rotations, auxiliary rocker arm 2 front ends are arranged driven valve opening 202; Arrange control valve bore 203 and unidirectional valve opening 204 on the auxiliary rocker arm body; Oilhole 210 connects rocker shaft hole 201 and control valve bore 203, and oilhole 220 connects control valve bore 203 and unidirectional valve opening 204, and oilhole 230 connects control valve bore 203, unidirectional valve opening 204 and driven valve opening 202; Air valve bridge 18 is positioned on exhaust valve 23 and the exhaust valve 24, and the sliding pin 181 on the air valve bridge 18 is between exhaust valve 23 and servo valve 17; Auxiliary cam 701 drives auxiliary rocker arm 2 around pitman arm shaft 3 rotations, near engine compresses stroke top dead center, opens exhaust valve 23 and realizes engine braking or realize internal EGR at aspirating stroke unlatching exhaust valve 23.When motor was made positive work, above-mentioned auxiliary cam can convert an EGR cam to, was used to provide an internal EGR lift.
Below in conjunction with accompanying drawing several preferred embodiments of the present invention is described in detail, but the present invention is not restricted to these embodiments.The present invention contain any on marrow of the present invention and scope, make substitute, modification, equivalent method and scheme.Understand for the public is had completely the present invention, in the following preferred embodiment of the present invention, specified concrete details, and do not had the description of these details also can understand the present invention fully for a person skilled in the art.In addition, for fear of essence of the present invention is caused unnecessary obscuring, do not specify well-known method, process, flow process, element etc.
To shown in Figure 6, the valve actuating device that application auxiliary cam of the present invention drives comprises exhaust rocker arm 1, auxiliary rocker arm 2, pitman arm shaft 3, exhaust roller 4, auxiliary rocker arm roller 5, exhaust rocker arm pressure ball seat assembly 6, camshaft 7, control valve 8, control valve return spring 9, oil drain valve 10, one-way valve 11, one-way valve return spring 12, adjustment bolt 13, stop collar 14, driven spring 15, back-up ring 16, servo valve 17, air valve bridge 18, piston 19, baffle ring 20, spring 21, lining 22, exhaust valve 23, exhaust valve 24, locking nut 25, roller shaft 26, interior hexagonal pyramidal plug screw 27 like Fig. 1.
Please refer to Fig. 1 to Fig. 7; A kind of valve actuating device of using the auxiliary cam driving comprises exhaust rocker arm 1, auxiliary rocker arm 2 and pitman arm shaft 3, and auxiliary rocker arm 2 comprises rocker arrangement, oilhole device and valve opening device; The valve opening device comprises rocker shaft hole 201, driven valve opening 202, control valve bore 203 and unidirectional valve opening 204; on the pitman arm shaft 3 oil circuit device is installed, and exhaust rocker arm 1 is arranged adjacent each other on the pitman arm shaft 3, in addition with auxiliary rocker arm 2; on the camshaft 7 of motor, increase an auxiliary cam 701, and auxiliary cam 701 drives auxiliary rocker arm 2 around pitman arm shaft 3 rotations through auxiliary rocker arm roller 5.Near the work of valve actuating device, engine compresses stroke top dead center; Control valve 8 is blocked the oil drain valve 10 on the rocking arm; One-way valve 11 is opened the oilhole that leads to driven valve opening 202; Be full of machine oil in the driven valve opening 202 of auxiliary rocker arm 2, the valve clearance is reserved in compensation, and cannot be flowed out by one-way valve 11; Compress driven spring 15, servo valve 17 is sliding pin 181 contacts on the gentle raft of pontoons of lower slider, and the lift effect of auxiliary cam 701 drives auxiliary rocker arm 2, and servo valve 17 is pressed to sliding pin 181, and sliding pin 181 moves downward and makes exhaust valve 23 open, and carries out engine braking; And when the engine charge stroke, the lift effect of auxiliary cam drives auxiliary rocker arm makes exhaust valve 23 open, and carries out internal EGR.Exhaust valve 23, exhaust valve 24 are mushroom valves, are used to control gas flow between motor internal furnace and the intake and exhaust manifold.
Exhaust rocker arm 1 drives exhaust valve 23 simultaneously through air valve bridge 18 and realizes exhaust stroke with exhaust valve 24.Camshaft 7 also comprises cam 702, camshaft 7 rotations, and cam 702 drives exhaust roller 4, makes exhaust rocker arm 1 around pitman arm shaft 3 rotations.The sliding pin 181 that auxiliary rocker arm 2 optionally drives on the air valve bridge 18 is opened exhaust valve 23 realization engine braking or internal EGR functions.The shoulder in sliding pin hole is connected on shoulder in the middle of the sliding pin 181 and the air valve bridge 18.And auxiliary rocker arm 2 does not influence the motion of exhaust valve 23 when the valve actuating device is not worked.
End and auxiliary cam 701 that auxiliary rocker arm roller 5 is installed in auxiliary rocker arm 2 contact, and auxiliary rocker arm 2 rotates around pitman arm shaft 3 under the driving of auxiliary cam 701.Auxiliary cam 701 comprises peach 711 and basic circle 721 two-part.Auxiliary cam 701 can make motor realize the disappointing formula engine braking of compression type, the formula of losing heart and part.The Compression Engine braking is near the compression stroke top dead center, to open exhaust valve or auxiliary valve; The formula engine braking that loses heart is to open exhaust valve in whole engine cycles; The disappointing formula engine braking of part is to open exhaust valve at most of stroke of engine cycles.
As shown in Figure 5, the front end of auxiliary rocker arm 2 comprises a convexity 205, piston 19, baffle ring 20 and spring 21, and piston 19 is pressed to convexity 205 under the effect of spring 21, makes both contacts all the time in the course of the work thereby auxiliary rocker arm 2 is pressed to auxiliary cam 701.Piston 19, baffle ring 20 can be fixed on camshaft support or other fixed components with spring 21.In the engine working process, spring 21 has enough spring forces contacts motor auxiliary rocker arm 2 always with auxiliary cam 701.
In engine working process; Auxiliary rocker arm 2 can remain with auxiliary cam 701 through other modes and contact; Another kind of mode of execution shown in figure 11; Torsion spring 28 1 ends are fixed on the auxiliary rocker arm 2, and the other end is fixed on the pitman arm shaft 3, and torsion spring 28 is pressed to auxiliary cam 701 with auxiliary rocker arm 2.In the engine operation engineering, torsion spring has enough spring forces that auxiliary rocker arm 2 is contacted with auxiliary cam 701 always.
As depicted in figs. 1 and 2, pitman arm shaft 3 comprises that oil circuit device offers the rocking arm on the pitman arm shaft 3 with machine oil.Specifically, comprise a lubricating oil path 301 and a control oil channel 302 on the pitman arm shaft 3.Lubricating oil path 301 can provide lubricant oil to one or more rocking arms in engine working process, control oil channel 302 can provide machine oil to auxiliary rocker arm 2, and machine oil enters into driven valve opening 202 through oil-through hole 210, oilhole 220 and oilhole 230.
Comprise oilhole device some internal oil passages just in the motor auxiliary rocker arm 2, specifically, comprise oilhole 210, oilhole 220 and oilhole 230, machine oil is flowed in rocking arm.Oil circuit in the auxiliary rocker arm 2 flow to control valve bore 203 and unidirectional valve opening 204, driven valve opening 202 with machine oil from pitman arm shaft 3.Under the control of solenoid valve or other electrically-controlled valve, machine oil optionally is provided to auxiliary rocker arm 2.Solenoid valve can be installed on the camshaft support, and oil circuit can be installed in cylinder cap or the camshaft support and for the control oil channel 302 on the pitman arm shaft 3 machine oil is provided.Through opening or closing solenoid valve, it can be several valve actuating device work simultaneously that machine oil optionally offers 302, one solenoid valves of control oil channel.
Motor auxiliary rocker arm 2 comprises the servo valve assembly that drives exhaust valve 23.The servo valve assembly is installed in the driven valve opening 202 of front end of auxiliary rocker arm 2, and the servo valve assembly comprises adjustment bolt 13, stop collar 14, driven spring 15, back-up ring 16, servo valve 17.Servo valve 17 can slide in the driven valve opening 202 of auxiliary rocker arm 2 front ends.Servo valve 17 inner hollow, adjustment bolt 13 lower half portions are installed in the hollow hole of servo valve 17.Stop collar 14 is positioned at the top of the hollow hole of servo valve 17, and the upper end is fixing by back-up ring 16, and driven spring 15 is between the enlargement steps down of stop collar inside and adjustment bolt 13 low sides.Driven spring 15 gives the stop collar bottom power that makes progress, and makes between the enlargement steps down of stop collar bottom and adjustment bolt low side to have certain clearance.Stop collar 14, back-up ring 16, servo valve 17 under the effect of driven spring 15 away from the sliding pin on the air valve bridge 18.Adjustment bolt 13 is outstanding from the top of auxiliary rocker arm 2, can regulate the gap between the sliding pin 181 on servo valve 17 and the air valve bridge.Adjustment bolt 13 is through locking nut 25 lockings.
Arrange control valve bore 203 and unidirectional valve opening 204 on the rocker body of auxiliary rocker arm 2, control valve 8, control valve return spring 9, oil drain valve 10 are positioned at control valve bore 203, and one-way valve 11, one-way valve return spring 12 are positioned at unidirectional valve opening 204.Whether control valve 8 flows to servo valve with one-way valve 11 may command machine oil.The oilhole 221 that oilhole 210 connects on control valve bore 203 and the lining 22.Oilhole 220 connects control valve bore 203 and unidirectional valve opening 204, and unidirectional valve opening 204 can be realized sealing by interior hexagonal pyramidal plug screw 27 on the outer surface of auxiliary rocker arm 2.
Like Fig. 7, Fig. 8 and shown in Figure 12, control valve 8 comprises first upper-end surface 801, second upper-end surface 802 and lower end surface 803, and the low pressure oil of oilhole 210 acts on first upper-end surface 801; The high pressure oil of oilhole 230 acts on second upper-end surface 802 and the lower end surface 803 simultaneously; The diameter of second upper-end surface 802 is greater than the diameter of lower end surface 803, and high pressure oil acts on power on second upper-end surface 802 greater than the power that acts on the lower end surface 803, when pressure difference acts on the power on first upper-end surface 801 greater than low pressure oil; Control valve 8 moves upward; Oilhole 230 communicates with oil drain valve 10, and the high pressure oil in the driven valve opening 202 gushes, and the servo valve inner engine oil is not enough when avoiding the engine valve actuating device just to start; Cracking pressure is excessive, and the contact stress between auxiliary cam 701 and the auxiliary rocker arm roller 5 is excessive.Machine oil gets into first upper-end surface 801 on the control valve 8 through oilhole 210; Promoting control valve 8 moves downward; Block the oil circuit that oilhole 230 leads to oil drain valve 10, machine oil gets into oilhole 220 simultaneously, promotes one-way valve 11 and moves downward; Machine oil gets into unidirectional valve opening 204 and enters into driven valve opening 202 through oilhole 230, and one-way valve does not allow machine oil to flow back to control oil channel 302 by driven valve opening 202 through oilhole 230, unidirectional valve opening 204, oilhole 220, oilhole 210 in the other direction.Control valve return spring 9 is pushed control valve 8 in the control valve bore to, and control valve return spring 9 is fixed in the control valve bore 203 by oil drain valve; One-way valve return spring 12 is pushed one-way valve in the unidirectional valve opening 204 to, and one-way valve return spring 12 is fixed in the unidirectional valve opening 204 by interior hexagonal pyramidal plug screw.
Like Fig. 9 and another kind of mode of execution shown in Figure 10, be the another kind of structural type of one-way valve, comprise one-way valve 29, unidirectional valve seat 30, unidirectional valve gap 31 and one-way valve return spring 32, interior hexagonal pyramidal plug screw 33.Unidirectional valve gap 31 is interference fitted in the top of the unidirectional valve opening 204 of auxiliary rocker arm; One-way valve 29 upper ends and unidirectional valve gap 31 cooperate; Lower end and unidirectional valve seat 30 cooperate; Between one-way valve 29 lower ends and unidirectional valve seat 30, arrange one-way valve return spring 32, one-way valve return spring 32 is pressed to unidirectional valve gap 31 with one-way valve 29, has oilhole 306 on the unidirectional valve seat 30; Machine oil can enter into driven valve opening 202 through oilhole 220, oilhole 306, oilhole 230, and one-way valve 29 does not allow machine oil to flow back to control oil channel 302 in the other direction by driven valve opening 202.
Below will introduce the working procedure of the valve actuating device of using the auxiliary cam driving in detail, the bent axle motion drives camshaft 7 rotations.Cam 702 on the camshaft 7 drives exhaust rocker arm 1 around pitman arm shaft 3 rotations, and open and close exhaust valve 23, exhaust valve 24 are realized exhaust stroke; Auxiliary cam 701 on the camshaft 7 drives auxiliary rocker arm around pitman arm shaft 3 rotations, realizes engine braking or internal EGR function.
As shown in Figure 1; During the motor proper functioning, closed electromagnetic valve does not have machine oil in the control oil channel 302 of pitman arm shaft 3; Engine oil pressure in the oilhole 210 is not enough to overcome the spring force of control valve return spring 9 and one-way valve return spring 12; Machine oil can not get into driven valve opening 202, and machine oil can flow out through oil drain valve 10 simultaneously, and servo valve 17 can slide in driven valve opening 202.Under the effect of driven spring 15; Stop collar 14 is away from the enlargement steps down of adjustment bolt low side; Drive servo valve 17 away from air valve bridge 18; The pig of servo valve 17 and adjustment bolt 13 makes on servo valve 17 and the air valve bridge 18 to have certain clearance between the sliding pin 181, and this gap enough overcomes the auxiliary lift that produces when auxiliary cam 701 drives auxiliary rocker arm 2 rotations.Camshaft 7 rotations, auxiliary cam 701 contacts with auxiliary rocker arm roller 5, drives auxiliary rocker arm 2 and rotates around pitman arm shaft 3, and the gap between servo valve 17 and the sliding pin 181 overcomes auxiliary lift, does not drive sliding pin 181, and is inoperative to exhaust valve 23.
As shown in Figure 2; During the work of engine valve actuating device, solenoid valve is opened, and machine oil gets into the control oil channel 302 in the pitman arm shaft; Machine oil in the control oil channel enters into control valve bore 203 through oilhole 210; Promote control valve 8 compression control valve return springs 9 oilhole 230 is blocked up, machine oil enters into unidirectional valve opening 204 through oilhole 220 simultaneously, promotes one-way valve compression one-way valve return spring 12; Machine oil enters into driven valve opening 202 through oilhole 230, and the machine oil that one-way valve 11 does not allow to enter into driven valve opening 202 flow back into control oil channel.Servo valve 17 moves downward the driven spring 15 of compression in the effect of machine oil; Contact with the sliding pin 181 on the air valve bridge 18, be full of machine oil in the driven valve opening simultaneously, stop collar 14 contacts with the enlargement steps down of adjustment bolt low side; Incompressibility according to machine oil; Servo valve 17 slip that can not in driven valve opening 202, make progress as long as solenoid valve is in opening state, just is full of machine oil in the driven valve opening 202.Camshaft 7 rotations; Auxiliary cam 701 contacts with auxiliary rocker arm roller 5; Drive auxiliary rocker arm 2 and rotate around pitman arm shaft 3, servo valve 17 can not slide in driven valve opening 202, and the sliding pin 181 that drives on the air valve bridge 18 is opened exhaust valve 23 realization engine braking or internal EGRs.
When the engine valve actuating device is not worked; Closed electromagnetic valve, the engine oil pressure in the control oil channel 302 is reduced near 0, and control valve 8 is pressed in the control valve bore 203 under the effect of control valve return spring 9; Oilhole 230 is connected with oil drain valve 10; Machine oil in the driven valve opening 202 flows into oil drain valve through oilhole 230, and one-way valve 11 is pressed towards under the effect of one-way valve return spring 12 in the unidirectional valve opening 204, the motor proper functioning.
In sum, owing to adopted above technical characteristics, make the present invention have following advantage and good effect than existing technology:
The first, the present invention uses the lift effect of auxiliary cam to drive auxiliary rocker arm and makes exhauxt valve opens, and carries out engine braking or internal EGR, longer service life simple in structure;
The second, the present invention is flowed out the machine oil in the driven valve opening when the engine oil pressure in the rocking arm is excessive in good time, and pressure discharges motor proper functioning long service life;
Three, the present invention is not when needing the work of valve actuating device, and the engine oil pressure in the rocking arm reduces, and the machine oil in the driven valve opening flows out, and pressure discharges motor proper functioning long service life.
The invention preferred embodiment just is used for helping to set forth the present invention.Preferred embodiment does not have all details of detailed descriptionthe, does not limit this invention yet and is merely described embodiment.Obviously, according to the content of this specification, can do a lot of modifications and variation.These embodiments are chosen and specifically described to this specification, is in order to explain principle of the present invention and practical application better, thereby person skilled can be utilized the present invention well under making.The present invention only receives the restriction of claims and four corner and equivalent.More than disclosed only be preferred embodiment of the present invention; But be not to be used for limiting itself; Anyly have the knack of those skilled in the art under the situation of spiritual connotation of the present invention, the equalization of being done changes and changes, and all should drop in protection scope of the present invention.
Claims (9)
1. use the valve actuating device that auxiliary cam drives for one kind; Comprise exhaust rocker arm (1), auxiliary rocker arm (2) and pitman arm shaft (3); Said auxiliary rocker arm (2) comprises rocker arrangement, oilhole device and valve opening device; Said valve opening device comprises rocker shaft hole (201), driven valve opening (202), control valve bore (203) and unidirectional valve opening (204); Said pitman arm shaft (3) is gone up oil circuit device is installed, and exhaust rocker arm (1) and auxiliary rocker arm (2) are arranged adjacent each other on the pitman arm shaft (3), it is characterized in that:
Go up an increase auxiliary cam (701) at the camshaft (7) of motor, said auxiliary cam (701) drives auxiliary rocker arm (2) through auxiliary rocker arm roller (5) and rotates around pitman arm shaft (3);
Work at the valve actuating device; Near the engine compresses stroke top dead center; Be full of machine oil in the driven valve opening (202) of auxiliary rocker arm (2); The valve clearance is reserved in compensation, and the lift effect of auxiliary cam (701) drives auxiliary rocker arm (2) promotion sliding pin (181) makes exhaust valve (23) open, and carries out engine braking;
Work at the valve actuating device; During the engine charge stroke; Be full of machine oil in the driven valve opening (202) of auxiliary rocker arm (2); The valve clearance is reserved in compensation, and the lift effect of auxiliary cam (701) drives auxiliary rocker arm (2) promotion sliding pin (181) makes exhaust valve (23) open, and carries out internal EGR.
2. a kind of valve actuating device that auxiliary cam drives of using according to claim 1, it is characterized in that: said auxiliary rocker arm (2) does not influence the motion of exhaust valve (23) when the valve actuating device is not worked.
3. a kind of valve actuating device that auxiliary cam drives of using according to claim 1 is characterized in that: adjustment bolt (13), stop collar (14), driven spring (15), back-up ring (16) and servo valve (17) are installed in the said driven valve opening (202).
4. a kind of valve actuating device that auxiliary cam drives of using according to claim 1 is characterized in that: the interior installation and control valve of said control valve bore (203) (8), control valve return spring (9) and oil drain valve (10).
5. a kind of valve actuating device that auxiliary cam drives of using according to claim 1; It is characterized in that: one-way valve (11) and one-way valve return spring (12) are installed in the said unidirectional valve opening (204), and on the outer surface of auxiliary rocker arm, are realized sealing by interior hexagonal pyramidal plug screw (27).
6. a kind of valve actuating device that auxiliary cam drives of using according to claim 4; It is characterized in that: said control valve (8) comprises first upper-end surface (801), second upper-end surface (802) and lower end surface (803); The diameter of second upper-end surface (802) is greater than the diameter of lower end surface (803); Low pressure oil acts on first upper-end surface (801) of said control valve (8); High pressure oil acts on second upper-end surface (802) and lower end surface (803) of said control valve simultaneously, and high pressure oil acts on pressure on second upper-end surface (802) greater than the pressure that acts on the lower end surface (803), when pressure difference acts on the power on first upper-end surface (801) greater than low pressure oil; Said control valve (8) moves upward, and high pressure oil gushes from oil drain valve (10).
7. a kind of valve actuating device that auxiliary cam drives of using according to claim 1; It is characterized in that: said camshaft (7) also comprises cam (702); Cam (702) is connected with exhaust rocker arm (1), and cam (702) drives exhaust rocker arm (1) and realizes exhaust stroke; Auxiliary cam (701) comprises peach (711) and basic circle (721) two-part.
8. a kind of valve actuating device that auxiliary cam drives of using according to claim 1; It is characterized in that: the front end of said auxiliary rocker arm (2) comprises convexity (205), piston (19), baffle ring (20) and spring (21); Said convexity (205), piston (19), baffle ring (20) and spring (21) are fixed on the camshaft support; Piston (19) is pressed to convexity (205) under the effect of spring (21); Auxiliary cam (701) is pressed to auxiliary rocker arm (2) in protruding (205), and auxiliary rocker arm (2) is contacted with auxiliary cam (701).
9. a kind of valve actuating device that auxiliary cam drives of using according to claim 1, it is characterized in that: said sliding pin (181) is installed on the air valve bridge (18), and the shoulder in the middle of the sliding pin (181) is connected with the shoulder that air valve bridge (18) is gone up the sliding pin hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210330486.6A CN102817666B (en) | 2012-09-10 | 2012-09-10 | A kind of valve actuating device applied auxiliary cam and drive |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210330486.6A CN102817666B (en) | 2012-09-10 | 2012-09-10 | A kind of valve actuating device applied auxiliary cam and drive |
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| CN102817666A true CN102817666A (en) | 2012-12-12 |
| CN102817666B CN102817666B (en) | 2016-04-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104005809A (en) * | 2013-02-26 | 2014-08-27 | 马自达汽车株式会社 | Valve operating device of engine |
| CN102817666B (en) * | 2012-09-10 | 2016-04-06 | 浙江亿日气动科技有限公司 | A kind of valve actuating device applied auxiliary cam and drive |
| CN107701255A (en) * | 2017-10-31 | 2018-02-16 | 潍柴动力股份有限公司 | A kind of valve early closes rocker arm body and a kind of engine |
| CN110566304A (en) * | 2018-11-30 | 2019-12-13 | 长城汽车股份有限公司 | Valve train and control strategy for an engine having a low pressure EGR system |
| CN113123843A (en) * | 2021-05-11 | 2021-07-16 | 浙江康和机械科技有限公司 | Braking rocker arm assembly, device thereof and engine |
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| CN1534169A (en) * | 2003-03-27 | 2004-10-06 | 日立优喜雅汽车配件有限公司 | Air valve operator for IC engine |
| CN1900491A (en) * | 2006-07-20 | 2007-01-24 | 姬腾飞 | Timing and lift continuous changeable device for engine air valve |
| CN101333968A (en) * | 2007-06-27 | 2008-12-31 | 李建春 | Device of engine for continuously changing air valve phase |
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| CN102817666B (en) * | 2012-09-10 | 2016-04-06 | 浙江亿日气动科技有限公司 | A kind of valve actuating device applied auxiliary cam and drive |
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| CN1534169A (en) * | 2003-03-27 | 2004-10-06 | 日立优喜雅汽车配件有限公司 | Air valve operator for IC engine |
| CN1900491A (en) * | 2006-07-20 | 2007-01-24 | 姬腾飞 | Timing and lift continuous changeable device for engine air valve |
| CN101333968A (en) * | 2007-06-27 | 2008-12-31 | 李建春 | Device of engine for continuously changing air valve phase |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817666B (en) * | 2012-09-10 | 2016-04-06 | 浙江亿日气动科技有限公司 | A kind of valve actuating device applied auxiliary cam and drive |
| CN104005809A (en) * | 2013-02-26 | 2014-08-27 | 马自达汽车株式会社 | Valve operating device of engine |
| CN107701255A (en) * | 2017-10-31 | 2018-02-16 | 潍柴动力股份有限公司 | A kind of valve early closes rocker arm body and a kind of engine |
| CN110566304A (en) * | 2018-11-30 | 2019-12-13 | 长城汽车股份有限公司 | Valve train and control strategy for an engine having a low pressure EGR system |
| WO2020108566A1 (en) * | 2018-11-30 | 2020-06-04 | 长城汽车股份有限公司 | Valve mechanism of engine with low-pressure egr system and control strategy |
| CN113123843A (en) * | 2021-05-11 | 2021-07-16 | 浙江康和机械科技有限公司 | Braking rocker arm assembly, device thereof and engine |
| WO2022237768A1 (en) * | 2021-05-11 | 2022-11-17 | 浙江康和机械科技有限公司 | Brake rocker arm assembly and device, and engine |
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|---|---|
| CN102817666B (en) | 2016-04-06 |
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