CN102828837A - Frame-type air-valve executing device driven by assistant cam - Google Patents
Frame-type air-valve executing device driven by assistant cam Download PDFInfo
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- CN102828837A CN102828837A CN2012103304565A CN201210330456A CN102828837A CN 102828837 A CN102828837 A CN 102828837A CN 2012103304565 A CN2012103304565 A CN 2012103304565A CN 201210330456 A CN201210330456 A CN 201210330456A CN 102828837 A CN102828837 A CN 102828837A
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Abstract
The invention relates to a frame-type air-valve executing device driven by an assistant cam. The frame-type air-valve executing device mainly comprises a frame, a driving valve and a driven valve; the driving valve and the driven valve are arranged on the frame; the assistant cam is arranged on a cam shaft of an engine; the frame comprises a driving valve hole, a driven valve hole, a control valve hole and a one-way valve hole; the driving valve is arranged in the driving valve hole and connected with a baffle; when the frame-type air-valve executing device is in use, a high-pressure oil line is full of engine oil, the driving valve slides out from the driving valve hole under the action of an oil pressure, the driving valve is in contact with the assistant cam, the driving valve is driven under the lifting action of the assistant cam so as to move, the engine oil is transmitted to the driven valve by the high-pressure oil line to press the driven valve towards a sliding pin, the sliding pin moves downwards to open an exhaust valve, and thus, engine brake or internal EGR (exhaust gas recirculation) is realized. According to the invention, the engine oil in the driven valve flows out in time when the engine oil pressure in the oil line on the frame is over high, so that the pressure is reduced, and then, the common service life of the engine is prolonged.
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 frame type 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 frame type valve actuating device of using the auxiliary cam driving mainly comprises framework, aggressive valve and servo valve, and aggressive valve and servo valve are installed on the framework, on the camshaft of motor, increases an auxiliary cam; Said framework comprises initiatively valve opening, driven valve opening, control valve bore and unidirectional valve opening; Said aggressive valve connects auxiliary wheel and roller shaft, and said aggressive valve is installed in the said active valve opening, and baffle plate is connected with screw with framework, and said aggressive valve is connected with baffle plate; When frame type valve actuating device is worked; Be full of machine oil in the high-pressure oil passage, aggressive valve skids off in the active valve opening under the effect of oil pressure, and aggressive valve contacts with auxiliary cam through auxiliary wheel; The lift effect of auxiliary cam drives aggressive valve towards frame movement; The motion of aggressive valve is delivered to servo valve through high-pressure oil passage, and servo valve is pressed to sliding pin, and sliding pin moves downward; Near engine compresses stroke top dead center, open exhaust valve and realize engine braking, when the engine charge stroke, open exhaust valve and realize internal EGR.
According to the described a kind of frame type valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention, when said servo valve is not worked at frame type valve actuating device, do not influence the motion of exhaust valve.
According to the described a kind of frame type valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention, adjustment bolt, servo valve, servo valve return spring, back-up ring and locking nut are installed in the said driven valve opening; Installation and control valve, control valve return spring and oil drain valve in the said control valve bore; One-way valve and one-way valve return spring are installed in the said unidirectional valve opening, and on frame outer, are realized sealing by interior hexagonal pyramidal plug screw.
According to the described a kind of frame type valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention; When the motor proper functioning; There is not machine oil in the said high-pressure oil passage; Aggressive valve is pressed in the active valve opening by baffle plate, and has certain interval between the auxiliary cam, and engine braking and internal EGR are not worked;
And servo valve under the effect of servo valve return spring away from the sliding pin on the air valve bridge, have certain clearance between servo valve and the sliding pin;
Said control valve is pressed towards in the control valve bore under the effect of control valve return spring, and high-pressure oil passage and oil drain valve communicate, and the machine oil in the high-pressure oil passage can be gushed by oil drain valve, and said one-way valve is pressed towards in the unidirectional valve opening under the effect of one-way valve return spring.
According to the described a kind of frame type valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention; During the work of frame type valve actuating device; Said control valve is blocked the oil drain valve on the framework; Said one-way valve is opened the oilhole that leads to high-pressure oil passage, and machine oil gets into initiatively valve opening and driven valve opening by high-pressure oil passage, and cannot be flowed out by one-way valve.
According to the described a kind of frame type valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention; Said control valve comprises first end face, second end face and the 3rd end face; The diameter of second end face is greater than the diameter of the 3rd end face, and low pressure oil acts on first end face of said control valve, and high pressure oil acts on second end face and the 3rd end face of said control valve simultaneously; High pressure oil acts on pressure on second end face greater than the pressure that acts on the 3rd end face; When pressure difference acted on the pressure on first end face greater than low pressure oil, control valve moved downward, and high pressure oil gushes from oil drain valve.
According to the described a kind of frame type valve actuating device that auxiliary cam drives of using of preferred embodiment of the present invention, said auxiliary cam comprises peach and basic circle.
According to the described a kind of frame type 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 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 aggressive valve 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 oil circuit on the framework 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 on the framework in the oil circuit 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 the structural drawing of the frame type valve actuating device of auxiliary cam driving;
Fig. 2 is the sectional view of the frame type valve actuating device servo valve position of auxiliary cam driving;
Fig. 3 is the sectional view of the frame type valve actuating device aggressive valve position of auxiliary cam driving;
Fig. 4 is the frame type valve actuating device control valve of auxiliary cam driving and the sectional view of oil drain valve position;
Fig. 5 is the worm's eye view of the frame type valve actuating device of auxiliary cam driving;
Fig. 6 is the plan view of the frame type valve actuating device of auxiliary cam driving;
When Fig. 7 is the motor proper functioning, each part position detailed view in control valve bore and the unidirectional valve opening;
When Fig. 8 is the frame type valve actuating device work of auxiliary cam driving, each part position detailed view 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 frame type 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 the structural drawing of second kind of aggressive valve device;
Figure 12 is the detailed view of control valve.
Embodiment
Technical program of the present invention lies in: arrange initiatively valve opening 101 on the framework 1; Driven valve opening 102; Control valve bore 103 and unidirectional valve opening 104, oilhole 110 connects solenoid valve and low pressure oil circuit 120, and oilhole 111 connects low pressure oil circuit 120 and control valve bore 103 and unidirectional valve opening 104; Oilhole 112 connects unidirectional valve opening 104 and high-pressure oil passage 130, and oilhole 113 connects control valve bore 103 and high-pressure oil passage 130.Low pressure oil is supplied with the solenoid valve 22 on the framework by cylinder cap, pitman arm shaft or miscellaneous part.Air valve bridge 19 is positioned on exhaust valve 20 and the exhaust valve 21, and the sliding pin 191 on the air valve bridge 19 is between exhaust valve 20 and servo valve 15; The auxiliary wheel 5 that auxiliary cam 701 drives on the aggressive valve 2; The motion of aggressive valve 2 passes to servo valve 15 through high pressure oil, near engine compresses stroke top dead center, opens exhaust valve 20 and realizes engine braking or open exhaust valve 20 realization internal EGRs in aspirating stroke; Baffle plate 3 makes between auxiliary wheel 5 and the auxiliary cam 701 on the aggressive valve 2 has certain clearance.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 frame type valve actuating device that application auxiliary cam of the present invention drives comprises framework 1, aggressive valve 2, baffle plate 3, screw 4, auxiliary wheel 5, roller shaft 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, interior hexagonal pyramidal plug screw 13, adjustment bolt 14, servo valve 15, servo valve return spring 16, back-up ring 17, locking nut 18, air valve bridge 19, exhaust valve 20, exhaust valve 21, solenoid valve 22 like Fig. 1.
Fig. 1 is one and uses the frame type valve actuation system that auxiliary cam drives to shown in Figure 6.Exhaust valve 20, exhaust valve 21 are mushroom valves, are used to control gas flow between motor internal furnace and the intake and exhaust manifold.The frame type valve actuation system that the application auxiliary cam drives can be used for realizing engine braking or realize internal EGR and need valve to have the situation of auxiliary lift.The frame type valve actuation system of using the auxiliary cam driving comprises a framework 1, and aggressive valve 2, servo valve 15, control valve 8, one-way valve 11 are arranged on the framework 1.Aggressive valve 2 passes motion to servo valve 15 under the driving of camshaft 7 or other devices.
Exhaust rocker arm drives exhaust valve 20 simultaneously through air valve bridge 19 and realizes exhaust stroke with exhaust valve 21.Camshaft 7 rotations, auxiliary cam 701 drives auxiliary wheel 5, makes relatively initiatively valve opening 101 slips of aggressive valve 2.The sliding pin 191 that servo valve 15 optionally drives on the air valve bridge 19 is opened exhaust valve 20 realization engine braking or internal EGR functions.The shoulder in sliding pin hole cooperates on shoulder in the middle of the sliding pin 191 and the air valve bridge 19.
Like Fig. 5 and shown in Figure 6, framework 1 comprises a plurality of oil circuits, machine oil is flowed in framework, thereby machine oil is offered aggressive valve 2, servo valve 15, control valve 8 and one-way valve 11.Specifically; Machine oil enters into low pressure oil circuit 120 through oilhole 110 from solenoid valve; Machine oil in the low pressure oil circuit 120 enters into control valve bore 103 and unidirectional valve opening 104 through oilhole 111, and low pressure oil enters into high-pressure oil passage 130 through oilhole 112 from unidirectional valve opening 104, and high pressure oil can flow back to control valve bore 103 through oilhole 113; Simultaneously, high-pressure oil passage 130 connects initiatively valve opening 101 and driven valve opening 102.Under the control of solenoid valve 22 or other electrically-controlled valve, machine oil optionally offers framework 1.Solenoid valve is installed on the framework 1, and oil circuit can be arranged in cylinder cap or the camshaft support and for the solenoid valve 22 on the framework 1 machine oil is provided.Through opening or closing solenoid valve, it is a frame type valve actuation system job of using the auxiliary cam driving that machine oil optionally offers 120, one solenoid valves of low pressure oil circuit.
Comprise one on the framework 1 by cam-actuated aggressive valve assembly.The aggressive valve assembly is installed in the end of framework 1, and the aggressive valve assembly comprises aggressive valve 2, baffle plate 3, screw 4, auxiliary wheel 5, roller shaft 6.Aggressive valve 2 can be slided in the active valve opening 101 of framework 1 end.Auxiliary wheel 5 is installed on the roller shaft 6 of aggressive valve 2 ends; Baffle plate 3 one ends are fixed on the framework 1 by screw 4, and an end and aggressive valve 2 contact, and baffle plate 3 is given 2 one power that make progress of aggressive valve; Make aggressive valve 2 away from the auxiliary cam on the camshaft 7 701, the braking lift is inoperative.
Another embodiment shown in figure 11 is the another kind of structural type of aggressive valve, comprises aggressive valve 2, baffle plate 3, screw 4, auxiliary wheel 5, roller shaft 6 and auxiliary rocker arm 32.Aggressive valve 2 can be slided in the active valve opening 101 of framework 1 end.Auxiliary rocker arm 32 is installed on the pitman arm shaft; Can rotate around pitman arm shaft; Auxiliary wheel 5 is installed on the roller shaft 6 of auxiliary rocker arm 32 ends, and the aggressive valve 2 that auxiliary rocker arm 32 optionally drives on the framework 1 is opened exhaust valves 20 realization engine braking or internal EGR functions.Baffle plate 3 one ends are fixed on the framework 1 by screw 4, and an end and aggressive valve 2 contact, and baffle plate 3 is given 2 one power that make progress of aggressive valve, makes aggressive valve 2 away from the auxiliary cam on the camshaft 7 701, and the braking lift is inoperative.
Comprise the servo valve assembly that drives exhaust valve 20 on the framework 1.The servo valve assembly is installed in the front end of framework 1, and the servo valve assembly comprises adjustment bolt 14, servo valve 15, servo valve return spring 16, back-up ring 17, locking nut 18.Servo valve 15 can slide in the driven valve opening 102 of framework 1 front end.Servo valve 15 is stepped, is respectively first upper-end surface 151, second upper- end surface 152 and 153, the first upper-end surfaces, lower end surface, the 151 diameters diameter greater than lower end surface 153, first upper-end surface 151 and adjustment bolt 14 pig.Back-up ring 17 is installed in the lower end of driven valve opening, and servo valve return spring 16 is between second upper-end surface 152 and back-up ring 17 of servo valve 15.Servo valve return spring 16 is given 15 1 power that make progress of servo valve, makes servo valve 15 away from the sliding pin on the air valve bridge 19 191, has certain clearance thereby make between servo valve lower end surface 153 and the sliding pin 191.Adjustment bolt 14 is outstanding by the top of driven valve opening 102, regulates adjustment bolt 14 and screws in the length in the driven valve opening 102, can regulate the gap between the sliding pin 191 on servo valve 15 and the air valve bridge.Adjustment bolt 14 is through locking nut 18 lockings.
The front end of framework 1 is arranged control valve bore 103 and unidirectional valve opening 104, and control valve 8, control valve return spring 9, oil drain valve 10 are positioned at control valve bore 103, and one-way valve 11, one-way valve return spring 12, interior hexagonal pyramidal plug screw 13 are positioned at unidirectional valve opening 104.Oilhole 111 offers control valve bore 103 and unidirectional valve opening 104 with the machine oil in the low pressure oil circuit 120, and low pressure oil enters into high-pressure oil passage 130 through oilhole 112.Unidirectional valve opening 104 can be realized sealing by interior hexagonal pyramidal plug screw 13 on the outer surface of framework 1.
Like Fig. 7, Fig. 8 and shown in Figure 12, control valve 8 comprises first end face 801, second end face 802 and the 3rd end face 803, and the low pressure oil of oilhole 111 acts on first end face 801; The high pressure oil of oilhole 113 acts on second end face 802 and the 3rd end face 803 simultaneously; The diameter of second end face 802 is greater than the diameter of the 3rd end face 803, and high pressure oil acts on power on second end face 802 greater than the power that acts on the 3rd end face 803, when pressure difference acts on the power on first end face 801 greater than low pressure oil; Control valve 8 moves downward; Oilhole 113 communicates with oil drain valve 10, and the high pressure oil in the high-pressure oil passage 130 gushes, and the servo valve inner engine oil is not enough when avoiding engine frame formula valve actuating device just to start; Cracking pressure is excessive, and the contact stress between auxiliary cam 701 and the auxiliary wheel 5 is excessive.Machine oil acts on control valve 8 first end faces 801 through oilhole 111; Promoting control valve 8 moves upward; Block the oil circuit that oilhole 113 leads to oil drain valve 10, machine oil gets into unidirectional valve opening 104 simultaneously, promotes one-way valve 11 and moves upward; Machine oil enters into high-pressure oil passage 130 through unidirectional valve opening 104, oilhole 112, and one-way valve does not allow machine oil to flow back to low pressure oil circuit 120 by high-pressure oil passage 130 through oilhole 112, unidirectional valve opening 104, oilhole 111 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 103 by oil drain valve; One-way valve return spring 12 is pushed one-way valve in the unidirectional valve opening 104 to, and one-way valve return spring 12 is fixed in the unidirectional valve opening 104 by interior hexagonal pyramidal plug screw.
Like Fig. 9 and another kind of embodiment shown in Figure 10, be the another kind of structural type of one-way valve, comprise ball-type check valve 24, unidirectional valve seat 25, unidirectional valve gap 26 and return spring 27, plug screw 28.Unidirectional valve gap 26 is interference fitted in the bottom of the unidirectional valve opening 104 of auxiliary rocker arm; Ball-type check valve 24 lower ends and unidirectional valve gap 26 cooperate; Upper end and unidirectional valve seat 25 cooperate; Between ball-type check valve 24 upper ends and unidirectional valve seat 25, arrange return spring 27, return spring 27 is pressed to unidirectional valve gap 26 with ball-type check valve 24, on the unidirectional valve seat 25 oilhole 251 is arranged; Machine oil can enter into high-pressure oil passage 130 through oilhole 111, oilhole 251, oilhole 112, and ball-type check valve 24 does not allow machine oil to flow back to low pressure oil circuit 120 in the other direction by driven valve opening 102.
Below will introduce the working procedure of the frame type valve actuation system of using the auxiliary cam driving in detail, the bent axle motion drives camshaft 7 rotations.Camshaft 7 drives exhaust rocker arm open and close exhaust valve 20, exhaust valve 21 is realized exhaust stroke; The aggressive valve 2 that auxiliary cam 701 on the camshaft 7 drives on the framework 1 realizes engine braking or internal EGR function.
Arrive shown in Figure 6 like Fig. 1; During the motor proper functioning; Closed electromagnetic valve, not for the low pressure oil circuit 120 on the framework 1 provides machine oil, the engine oil pressure in the oilhole 111 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 102, and machine oil can flow out through oil drain valve 10 simultaneously.Servo valve 15 under the effect of servo valve return spring 16 away from air valve bridge 19; The pig of servo valve 15 and adjustment bolt 14; Regulate the length that the adjustment bolt screws in framework 1 and can adjust the gap between the sliding pin 191 on servo valve 15 and the air valve bridge 19, the exhaust valve lift that this gap can the control brake operating mode.Aggressive valve 2 under the effect of baffle plate 3 away from the auxiliary cam on the camshaft 7 701, auxiliary cam 701 separates with auxiliary wheel 5, auxiliary lift is inoperative.Camshaft 7 rotations, the gap between auxiliary cam 701 and the auxiliary wheel 5 overcomes auxiliary lift, and is inoperative to the aggressive valve on the framework 1, and servo valve 15 does not drive sliding pin 191, does not influence the work of exhaust valve 20.
Arrive shown in Figure 6 like Fig. 1; During the work of engine frame formula valve actuating device, solenoid valve is opened, the oilhole 110 that machine oil gets into through solenoid valve 22; Machine oil in the oilhole 110 enters into oilhole 111 through low pressure oil circuit 120; Machine oil enters into unidirectional valve opening 104 through oilhole 111, promotes one-way valve compression one-way valve return spring 12, and machine oil enters into high-pressure oil passage 130 through oilhole 112; Enter into initiatively valve opening 101 and driven valve opening 102 through high-pressure oil passage 130, the machine oil that one-way valve 11 does not allow to enter in the high-pressure oil passage 130 flow back into low pressure oil circuit 120.Machine oil enters into control valve bore 103 simultaneously, promotes control valve 8 compression control valve return springs 9 oil drain valve 10 is blocked up.Servo valve 15 moves downward compression servo valve return spring 16 in the effect of engine oil pressure, contact with sliding pin 191 on the air valve bridge 19, is full of machine oil on the simultaneously driven valve opening.Aggressive valve 2 under the effect of high pressure oil along aggressive valve hole 101 to lower slider, contact with auxiliary wheel 5.Camshaft 7 rotations; Auxiliary cam 701 drives auxiliary wheel 5; Aggressive valve 2 is along initiatively upwards slip of valve opening 101, and according to the incompressibility of machine oil, the motion of aggressive valve passes to servo valve 15 through high pressure oil; Servo valve 15, drives sliding pin 191 on the air valve bridge 19 and opens exhaust valves 20 and realize engine braking or internal EGRs to lower slider along driven valve opening 102.
When engine frame formula valve actuating device is not worked; Closed electromagnetic valve; Engine oil pressure in the high-pressure oil passage 130 is reduced near 0, and control valve 8 is pressed under the effect of control valve return spring 9 in the control valve bore 103, and oilhole 113 is connected with oil drain valve 10; Initiatively valve opening 101 flows into oil drain valves with driven valve opening 102 interior machine oil through high-pressure oil passage 130, oilhole 113; Aggressive valve 2 under the effect of baffle plate 3 away from auxiliary cam 701, servo valve 15 under the effect of servo valve return spring 16 away from sliding pin 191, 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 aggressive valve 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 oil circuit on the framework 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 on the framework in the oil circuit 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 (8)
1. use the frame type valve actuating device that auxiliary cam drives for one kind; Mainly comprise framework (1), aggressive valve (2) and servo valve (15); Aggressive valve (2) and servo valve (15) are installed on the framework (1); Said framework (1) comprises initiatively valve opening (101), driven valve opening (102), control valve bore (103) and unidirectional valve opening (104), it is characterized in that:
Go up an increase auxiliary cam (701) at the camshaft (7) of motor;
Said aggressive valve (2) connects auxiliary wheel (5) and roller shaft (6), and said aggressive valve (2) is installed in the said active valve opening (101), and baffle plate (3) is connected with screw (4) with framework (1), and said aggressive valve (2) is connected with baffle plate (3);
When frame type valve actuating device is worked; High-pressure oil passage is full of machine oil in (130); Aggressive valve under the effect of oil pressure (2) skids off in active valve opening (101); Aggressive valve (2) contacts with auxiliary cam (701) through auxiliary wheel (5), and the lift effect of auxiliary cam (701) drives aggressive valve (2) towards framework (1) motion, and the motion of aggressive valve (2) is delivered to servo valve (15) through high-pressure oil passage (130); Servo valve (15) is pressed to sliding pin (191); Sliding pin (191) moves downward, and opens exhaust valve (20) in the time of near engine compresses stroke top dead center and realizes engine braking, realizes internal EGR and when the engine charge stroke, open exhaust valve (20).
2. a kind of frame type valve actuating device that auxiliary cam drives of using according to claim 1 is characterized in that: when said servo valve (15) is not worked at frame type valve actuating device, do not influence the motion of exhaust valve (20).
3. a kind of frame type valve actuating device that auxiliary cam drives of using according to claim 1 is characterized in that:
Adjustment bolt (14), servo valve (15), servo valve return spring (16), back-up ring (17) and locking nut (18) are installed in the said driven valve opening (102);
The interior installation and control valve of said control valve bore (103) (8), control valve return spring (9) and oil drain valve (10);
One-way valve (11) and one-way valve return spring (12) are installed in the said unidirectional valve opening (104), and on the outer surface of framework (1), are realized sealing by interior hexagonal pyramidal plug screw (13).
4. a kind of frame type valve actuating device that auxiliary cam drives of using according to claim 3 is characterized in that: when the motor proper functioning,
Said high-pressure oil passage does not have machine oil in (130), and aggressive valve (2) is pressed in the active valve opening (101) by baffle plate (3), and has certain interval between the auxiliary cam (701), and engine braking and internal EGR are not worked;
And servo valve (15) under the effect of servo valve return spring (16) away from the sliding pin (191) on the air valve bridge (19), have certain clearance between servo valve (15) and the sliding pin (191);
Said control valve (8) is pressed towards under the effect of control valve return spring (9) in the control valve bore (103); High-pressure oil passage (130) and oil drain valve communicate; Machine oil in the high-pressure oil passage (130) can be gushed by oil drain valve, and said one-way valve (11) is pressed towards under the effect of one-way valve return spring (12) in the unidirectional valve opening (104).
5. a kind of frame type valve actuating device that auxiliary cam drives of using according to claim 3; It is characterized in that: during the work of frame type valve actuating device; Said control valve (8) is blocked the oil drain valve on the framework (1); Said one-way valve (11) is opened the oilhole that leads to high-pressure oil passage (130), and machine oil gets into initiatively valve opening (101) and driven valve opening (102) by high-pressure oil passage (130), and cannot be flowed out by one-way valve (11).
6. a kind of frame type valve actuating device that auxiliary cam drives of using according to claim 3; It is characterized in that: said control valve (8) comprises first end face (801), second end face (802) and the 3rd end face (803); The diameter of second end face (802) is greater than the diameter of the 3rd end face (803); Low pressure oil acts on first end face (801) of said control valve (8); High pressure oil acts on second end face (802) and the 3rd end face (803) of said control valve (8) simultaneously, and high pressure oil acts on pressure on second end face (802) greater than the pressure that acts on the 3rd end face (803), when pressure difference acts on the pressure on first end face (801) greater than low pressure oil; Control valve (8) moves downward, and high pressure oil gushes from oil drain valve (10).
7. a kind of frame type valve actuating device that auxiliary cam drives of using according to claim 1, it is characterized in that: said auxiliary cam (701) comprises peach (711) and basic circle (721).
8. a kind of frame type valve actuating device that auxiliary cam drives of using according to claim 1; It is characterized in that: said sliding pin (191) is installed on the air valve bridge (19), and the shoulder that shoulder in the middle of the sliding pin (191) and air valve bridge (19) are gone up the sliding pin hole is connected.
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| CN201210330456.5A CN102828837B (en) | 2012-09-10 | 2012-09-10 | A kind of frame type valve actuating device applied auxiliary cam and drive |
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| CN201210330456.5A CN102828837B (en) | 2012-09-10 | 2012-09-10 | A kind of frame type valve actuating device applied auxiliary cam and drive |
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| CN102828837B CN102828837B (en) | 2015-12-30 |
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| CN102828837B (en) | 2015-12-30 |
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