CN202926417U - Air valve executing device with torsion spring and driven by auxiliary cam - Google Patents
Air valve executing device with torsion spring and driven by auxiliary cam Download PDFInfo
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- CN202926417U CN202926417U CN201220455944.4U CN201220455944U CN202926417U CN 202926417 U CN202926417 U CN 202926417U CN 201220455944 U CN201220455944 U CN 201220455944U CN 202926417 U CN202926417 U CN 202926417U
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Abstract
The utility model provides an air valve executing device with a torsion spring and driven by an auxiliary cam. The air valve executing device with the torsion spring and driven by the auxiliary cam comprises an exhausting rocker arm, an auxiliary rocker arm and a rocker arm shaft, and the auxiliary rocker arm comprises a rocker arm device, an oilhole device and a valve hole device. An oil channel device is installed on the rocker arm shaft, the exhausting rocker arm and the auxiliary rocker arm are adjacently arranged on the rocker arm shaft, an auxiliary cam is added on the camshaft of an engine, and the auxiliary cam drives the auxiliary rocker arm to rotate around the rocker arm shaft. When the air valve executing device works, a servo valve hole of the auxiliary rocker arm is filled with oil engine, and the lift range action of the auxiliary cam drives the auxiliary rocker arm and enables an exhaust valve to open to carry out brake or internal exhaust gas recirculation (EGR) of the engine. The torsion spring is installed on the auxiliary rocker arm and the rocker arm shaft, the torsion spring presses the auxiliary rocker arm to the auxiliary cam, and the auxiliary rocker arm and the auxiliary cam are enabled to contact with each other. When the engine oil pressure in the rocker arm is too big, the air valve executing device with the torsion spring and driven by the auxiliary cam guides the engine oil inside the servo valve hole out timely, pressure is lowered, and service life of the engine is long when the engine works normally.
Description
Technical field
The utility model relates to a kind of valve mechanism actuating device, be specifically related to a kind of being applied on diesel engine, a kind of valve actuating device that torsion spring is used the auxiliary cam driving that has is provided, realizes the system of the auxiliary lift of valve, be particularly useful for engine braking and internal EGR function.
Background technique
Diesel engine is mainly as the power source of commercial car.When diesel engine was made positive work, in camshaft rotating 360 degrees (720 ° of crankshaft rotating) process, motor was completed air inlet, compression, acting and four work cycle of exhaust.When compression stroke finished, fuel oil sprayed in cylinder and burns, externally acting in expansion stroke subsequently.On the diesel engine camshaft, generally include intake cam and exhaust cam, intake cam is opened intake valve in aspirating stroke enter in cylinder air, and exhaust cam is used for opening exhaust valve the waste gas of burning is discharged cylinder in exhaust stroke.
Development along with technology, diesel engine is except 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, such as gas recirculation system (Exhaust Gas Recirculation the is called for short EGR) application of technology obviously reduces the discharging of motor NOx (many nitrogen oxidess), the application of engine braking technology promotes car load auxiliary braking performance effectively.
The resistance that the engine braking technology produces when referring to utilize the motor operation comes effective regulation speed, engine braking is by the fall holder of automobile to motor, utilize mechanical loss, pumping loss and the compression work etc. of motor to produce braking function, thereby increase automobile brake power.The engine braking technology is divided into three kinds of Compression Engine braking, deflation type engine braking and part deflation type engine brakings.The Compression Engine braking is to open exhaust valve or auxiliary valve near the compression stroke top dead center; The deflation type engine braking is to open exhaust valve at whole cycle of engine; Part deflation type engine braking is to open exhaust valve at most of stroke of cycle of engine.The application of engine braking technology reduces the frequency of utilization of Service Brake effectively, car load is when the precipitous road surfaces such as lower long slope, rugged hill path, use engine braking, can avoid because of the long-time break that uses, cause the temperature of brake bush to raise, braking force is descended, even ineffective.
EGR is a technology for reducing discharging of present extensive use on diesel engine.During engine positive power, open one or more intake valves in aspirating stroke, fuel and air enter cylinder, comprise oxygen and a large amount of nitrogen in air, at expansion stroke, oxygen and fuel combustion, the pushing piston acting, the comburant temperature sharply raises simultaneously, nitrogen is inert gas, be not easy oxidation, but the temperature height to a certain extent, still can form NOx.If therefore will reduce the amount of nitrogen oxides in exhaust, just must manage to reduce the combustion temperature in cylinder.The mainstream technology that reduces at present NOx is exactly to import some waste gas that burnt in suction tude, mix with fresh air, make it again to burn, effect is the oxygen concentration that reduces mixed gas, the heat that the absorption burning discharges, make that velocity of combustion slows down, combustion temperature reduces, just reduced the generation quantity of NOx, no matter Modern Engine is petrol engine or diesel engine, the EGR gas recirculation system has been arranged.
Usually, egr system is divided into two kinds of internal EGR and outside EGR, and outside EGR refers to 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 enter the firing chamber.
The actuating device of valve mechanism can provide one or a plurality of auxiliary valve lift, is used for realizing 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 support, in 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, servo valve can slide in driven valve opening, initiatively valve opening and driven valve opening are communicated with by the oil circuit on support, and whether electromagnetic valve the oil circuit fuel feeding in the support.When the engine valve actuating device was worked, machine oil entered the hydraulic circuit on support, and due to the incompressibility of machine oil, servo valve can not slide in driven valve opening, opened valve under the driving of auxiliary lift on camshaft.When cancelling the auxiliary valve lift, machine oil can flow out by the oil circuit on support.Another kind of valve actuating device can be integrated in rocking arm by the component of will be correlated with and realize, this form has been avoided increasing the motor whole height and increasing engine weight after the application support.
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; contact stress between valve actuating device stress excessive and cam and roller driven member is excessive, easily causes damage of components.
The model utility content
For defects, the purpose of this utility model is to provide a kind of simple, efficient valve actuating device, to solve the technical problem of prior art.
For achieving the above object, the utility model has adopted following technological scheme:
a kind of valve actuating device with the driving of torsion spring application auxiliary cam, comprise exhaust rocker arm, auxiliary rocker arm and pitman arm shaft, described auxiliary rocker arm comprises rocker arrangement, oilhole device and valve opening device, described valve opening device comprises rocker shaft hole, driven valve opening, control valve opening and unidirectional valve opening, on described pitman arm shaft, oil circuit device is installed, exhaust rocker arm and auxiliary rocker arm are arranged adjacent each other on pitman arm shaft, in addition, increase an auxiliary cam on the camshaft of motor, described auxiliary cam rotates around pitman arm shaft by auxiliary rocker arm idler wheel driving dynamic auxiliary rocking arm, work at the valve actuating device, near 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, the lift effect of auxiliary cam drives auxiliary rocker arm promotion sliding pin and makes exhauxt valve opens, carry out engine braking, when the engine charge stroke, the lift effect of auxiliary cam drives auxiliary rocker arm promotion sliding pin and makes exhauxt valve opens, carries out internal EGR, in addition, returning apparatus has a torsion spring on auxiliary rocker arm, and described torsion spring one end is fixed on auxiliary rocker arm, and the other end is fixed on pitman arm shaft, and torsion spring presses to auxiliary cam with auxiliary rocker arm, and auxiliary rocker arm is contacted with auxiliary cam.
According to the described valve actuating device with the driving of torsion spring application auxiliary cam of the utility model preferred embodiment, when described auxiliary rocker arm is not worked at the valve actuating device, do not affect the motion of exhaust valve.
According to the described valve actuating device with the driving of torsion spring application auxiliary cam of the utility model preferred embodiment, install in described driven valve opening and adjust bolt, stop collar, driven spring, back-up ring and servo valve.
According to the described valve actuating device with the driving of torsion spring application auxiliary cam of the utility model preferred embodiment, control valve, control valve return spring and oil drain valve are installed in described control valve opening.
According to the described valve actuating device with the driving of torsion spring application auxiliary cam of the utility model preferred embodiment, one-way valve and one-way valve return spring are installed in described unidirectional valve opening, and are realized sealing by interior hexagonal pyramidal plug screw on the outer surface of auxiliary rocker arm.
according to the described valve actuating device with the driving of torsion spring application auxiliary cam of the utility model preferred embodiment, described control valve comprises the first upper-end surface, the second upper-end surface and lower end surface, the diameter of the second upper-end surface is greater than the diameter of lower end surface, low pressure oil acts on the first upper-end surface of described control valve, high pressure oil acts on second upper-end surface and lower end surface of described control valve simultaneously, high pressure oil acts on pressure on the second upper-end surface greater than the pressure that acts on the lower end surface, when acting on the power on the first upper-end surface greater than low pressure oil when pressure difference, described control valve moves upward, high pressure oil gushes from oil drain valve.
According to the described valve actuating device with the driving of torsion spring application auxiliary cam of the utility model preferred embodiment, described camshaft also comprises cam, and cam is connected with exhaust rocker arm, and the actuated by cams exhaust rocker arm is realized exhaust stroke; Auxiliary cam comprises peach and basic circle two-part.
Have torsion spring and use the valve actuating device that auxiliary cam drives according to the utility model preferred embodiment is described, described sliding pin is arranged on air valve bridge, and on the shoulder in the middle of sliding pin and air valve bridge, the shoulder in sliding pin hole is connected.
Owing to having adopted above technical characteristics, make the utility model have following advantage and good effect than prior art:
The first, the utility model 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 utility model when the engine oil pressure in rocking arm is excessive, flows out the machine oil in driven valve opening earth pressure release engine work long service life in good time;
Three, the utility model is not when needing the work of valve actuating device, and the engine oil pressure in rocking arm reduces, and the machine oil in driven valve opening flows out, earth pressure release engine work long service life.
Certainly, implement any one specific embodiment of the utility model content, might not have simultaneously above whole technique effect.
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 engine work, control each part position figure in valve opening and unidirectional valve opening;
When Fig. 8 is the valve actuating device work of auxiliary cam driving, control each part position figure in valve opening and unidirectional valve opening;
When Fig. 9 is engine work, the key plan of the second 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 the second one-way valve structures in unidirectional valve opening;
Figure 11 is that the second drives the torsion spring structural drawing that auxiliary rocker arm presses to camshaft;
Figure 12 is the detailed view of control valve.
Embodiment
the technical solution of the utility model is: the oil circuit device on pitman arm shaft 3 has lubricating oil path 301 and oil circuit control 302, exhaust rocker arm 1 and auxiliary rocker arm 2 are arranged adjacent each other on pitman arm shaft 3, can be around pitman arm shaft 3 rotations, the rocker shaft hole 201 of installing around pitman arm shaft is arranged on auxiliary rocker arm 2, auxiliary rocker arm 2 front ends are arranged driven valve opening 202, arrange on the auxiliary rocker arm body and control valve opening 203 and unidirectional valve opening 204, oilhole 210 connecting rocker arm axis holes 201 and control valve opening 203, oilhole 220 connects controls valve opening 203 and unidirectional valve opening 204, oilhole 230 connects controls valve opening 203, unidirectional valve opening 204 and driven valve opening 202, air valve bridge 18 is positioned on exhaust valve 23 and exhaust valve 24, and the sliding pin 181 on 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, opens exhaust valve 23 and realize engine braking or open exhaust valve 23 in aspirating stroke and realize internal EGR near engine compresses stroke top dead center.When motor was made positive work, above-mentioned auxiliary cam can convert an EGR cam to, was used to provide an internal EGR lift.
For ease of understanding, below in conjunction with accompanying drawing, preferred embodiment of the present utility model is done being described in further detail.
arrive shown in Figure 6 as Fig. 1, the valve actuating device of using the auxiliary cam driving 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, adjust 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.
please refer to Fig. 1 to Fig. 7, use the valve actuating device that auxiliary cam drives, comprise exhaust rocker arm 1, auxiliary rocker arm 2 and pitman arm shaft 3, 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 opening 203 and unidirectional valve opening 204, on pitman arm shaft 3, oil circuit device is installed, exhaust rocker arm 1 and auxiliary rocker arm 2 are arranged adjacent each other on pitman arm shaft 3, in addition, increase an auxiliary cam 701 on the camshaft 7 of motor, auxiliary cam 701 drives auxiliary rocker arm 2 around pitman arm shaft 3 rotations by 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 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 down slidings contact with sliding pin 181 on air valve bridge, and the lift effect of auxiliary cam 701 drives auxiliary rocker arm 2, and servo valve 17 presses 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 and makes exhaust valve 23 open, and carries out internal EGR.Exhaust valve 23, exhaust valve 24 are mushroom valves, for flowing of gas between control engine internal furnace and intake and exhaust manifold.
Exhaust rocker arm 1 drives simultaneously exhaust valve 23 by air valve bridge 18 and exhaust valve 24 is realized exhaust stroke.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 unlatching exhaust valves 23 that auxiliary rocker arm 2 optionally drives on air valve bridge 18 are realized engine braking or internal EGR function.On shoulder in the middle of sliding pin 181 and air valve bridge 18, the shoulder in sliding pin hole is connected.And auxiliary rocker arm 2 does not affect the motion of exhaust valve 23 when the valve actuating device is not worked.
Auxiliary rocker arm roller 5 is arranged on the end of auxiliary rocker arm 2, and auxiliary cam 701 contacts, auxiliary rocker arm 2 under the driving of auxiliary cam 701 around pitman arm shaft 3 rotations.Auxiliary cam 701 comprises peach 711 and basic circle 721 two-part.Auxiliary cam 701 can make motor realize compression type, deflation type and part deflation type engine braking.The Compression Engine braking is to open exhaust valve or auxiliary valve near the compression stroke top dead center; The deflation type engine braking is to open exhaust valve at whole cycle of engine; Part deflation type engine braking is to open exhaust valve at most of stroke of cycle of engine.
As shown in Figure 5, the front end of auxiliary rocker arm 2 comprises a projection 205, piston 19, baffle ring 20 and spring 21, and piston 19 presses to projection 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 and spring 21 can be fixed on camshaft support or other fixed components.In 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 by other means with auxiliary cam 701 and contact, another kind of mode of execution as shown in figure 11, torsion spring 28 1 ends are fixed on auxiliary rocker arm 2, the other end is fixed on pitman arm shaft 3, and torsion spring 28 presses 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 rocking arm on pitman arm shaft 3 with machine oil.Specifically, comprise a lubricating oil path 301 and an oil circuit control 302 on pitman arm shaft 3.Lubricating oil path 301 can provide lubricant oil to one or more rocking arms in engine working process, oil circuit control 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 namely some internal oil passages of oilhole device in motor auxiliary rocker arm 2, specifically, comprise oilhole 210, oilhole 220 and oilhole 230, machine oil is flowed in rocking arm.Oil circuit in auxiliary rocker arm 2 flow to machine oil and controls valve opening 203 and unidirectional valve opening 204, driven valve opening 202 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 arranged on camshaft support, and oil circuit can be arranged in cylinder cap or camshaft support and provide machine oil for the oil circuit control 302 on pitman arm shaft 3.By opening or closing solenoid valve, it can be several valve actuating device work simultaneously that machine oil optionally offers 302, one solenoid valves of oil circuit control.
Motor auxiliary rocker arm 2 comprises the servo valve assembly that drives exhaust valve 23.The servo valve assembly is arranged in the driven valve opening 202 of front end of auxiliary rocker arm 2, and the servo valve assembly comprises adjusts bolt 13, stop collar 14, driven spring 15, back-up ring 16, servo valve 17.Servo valve 17 can be in the interior slip of driven valve opening 202 of auxiliary rocker arm 2 front ends.Servo valve 17 inner hollow are adjusted bolt 13 lower half portions and are arranged 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 enlarged of stop collar inside and adjustment bolt 13 low sides.Driven spring 15 gives the stop collar bottom power that makes progress, and makes the stop collar bottom and adjust between the enlarged of bolt low side to have certain gap.Stop collar 14, back-up ring 16, servo valve 17 under the effect of driven spring 15 away from the sliding pin on air valve bridge 18.Adjust bolt 13 outstanding from the top of auxiliary rocker arm 2, can regulate the gap between sliding pin 181 on servo valve 17 and air valve bridge.Adjust bolt 13 by locking nut 25 lockings.
Arrange on the rocker body of auxiliary rocker arm 2 and control valve opening 203 and unidirectional valve opening 204, control valve 8, control valve return spring 9, oil drain valve 10 are positioned at and control valve opening 203, and one-way valve 11, one-way valve return spring 12 are positioned at unidirectional valve opening 204.Control valve 8 and one-way valve 11 can be controlled machine oil and whether flow to servo valve.Oilhole 210 connects the oilhole 221 of controlling on valve opening 203 and lining 22.Oilhole 220 connects controls valve opening 203 and unidirectional valve opening 204, and unidirectional valve opening 204 can be realized by interior hexagonal pyramidal plug screw 27 sealing on the outer surface of auxiliary rocker arm 2.
as Fig. 7, Fig. 8 and shown in Figure 12, control valve 8 comprises the first upper-end surface 801, the second upper-end surface 802 and lower end surface 803, the low pressure oil of oilhole 210 acts on the first upper-end surface 801, the high pressure oil of oilhole 230 acts on the second upper-end surface 802 and lower end surface 803 simultaneously, the diameter of the second upper-end surface 802 is greater than the diameter of lower end surface 803, high pressure oil acts on power on the second upper-end surface 802 greater than the power that acts on lower end surface 803, when acting on the power on the first upper-end surface 801 greater than low pressure oil when pressure difference, control valve 8 moves upward, oilhole 230 and oil drain valve 10 communicate, high pressure oil in driven valve opening 202 gushes, when avoiding the engine valve actuating device just to start, the servo valve inner engine oil is not enough, cracking pressure is excessive, contact stress between auxiliary cam 701 and auxiliary rocker arm roller 5 is excessive.Machine oil enters the first upper-end surface 801 on 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 enters oilhole 220 simultaneously, promoting one-way valve 11 moves downward, machine oil enters 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 oil circuit control 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 to control in valve opening, and control valve return spring 9 is fixed on by oil drain valve and controls in valve opening 203; One-way valve return spring 12 is pushed one-way valve in unidirectional valve opening 204 to, and one-way valve return spring 12 is fixed in unidirectional valve opening 204 by interior hexagonal pyramidal plug screw.
Another kind of mode of execution as shown in Figure 9 and Figure 10 is the another kind of structural type of one-way valve, comprises one-way valve 29, one-way 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 coordinate, lower end and one-way valve seat 30 coordinate, arrange one-way valve return spring 32 between one-way valve 29 lower ends and one-way valve seat 30, one-way valve return spring 32 presses to unidirectional valve gap 31 with one-way valve 29, have oilhole 306 on one-way 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 oil circuit control 302 in the other direction by driven valve opening 202.
Below will introduce in detail the working procedure of the valve actuating device of using the auxiliary cam driving, Crankshaft motion drives camshaft 7 rotations.Cam 702 on 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 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 engine work, closed electromagnetic valve; there is no machine oil in the oil circuit control 302 of pitman arm shaft 3; engine oil pressure in 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 enter driven valve opening 202, machine oil can flow out through oil drain valve 10 simultaneously, and servo valve 17 can be in the interior slip of driven valve opening 202.Under the effect of driven spring 15, stop collar 14 is away from the enlarged of adjusting the bolt low side, drive servo valve 17 away from air valve bridge 18, the bottom connection of servo valve 17 and adjustment bolt 13 touches, make on servo valve 17 and air valve bridge 18 and have certain gap between sliding pin 181, this gap enough overcomes the auxiliary lift that produces when auxiliary cam 701 drives auxiliary rocker arm 2 rotation.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 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, machine oil enters the oil circuit control 302 in pitman arm shaft, machine oil in oil circuit control enters into through oilhole 210 and controls valve opening 203, promoting control valve 8 compression control valve return springs 9 blocks oilhole 230, machine oil enters into unidirectional valve opening 204 through oilhole 220 simultaneously, promote 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 oil circuit control.Servo valve 17 moves downward the driven spring 15 of compression in the effect of machine oil, contact with the sliding pin 181 on air valve bridge 18, be full of machine oil in driven valve opening simultaneously, stop collar 14 contacts with the enlarged of adjusting the bolt low side, incompressibility according to machine oil, servo valve 17 slip that can not make progress in driven valve opening 202 as long as solenoid valve is in opening state, just is full of machine oil in 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 be in the interior slip of driven valve opening 202, and the sliding pin 181 unlatching exhaust valves 23 that drive on air valve bridge 18 are realized engine braking or internal EGR.
When the engine valve actuating device is not worked, closed electromagnetic valve, engine oil pressure in oil circuit control 302 is reduced near 0, control valve 8 presses under the effect of control valve return spring 9 in control valve hole 203, oilhole 230 and oil drain valve 10 connect, machine oil in 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 unidirectional valve opening 204, engine work.
Owing to having adopted above technical characteristics, make the utility model have following advantage and good effect than prior art:
The first, the utility model 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 utility model when the engine oil pressure in rocking arm is excessive, flows out the machine oil in driven valve opening earth pressure release engine work long service life in good time;
Three, the utility model is not when needing the work of valve actuating device, and the engine oil pressure in rocking arm reduces, and the machine oil in driven valve opening flows out, earth pressure release engine work long service life.
Certainly, implement any one specific embodiment of the utility model content, might not have simultaneously above whole technique effect.
Above disclosed be only preferred embodiment of the present utility model; but be not to limit itself; anyly have the knack of those skilled in the art in the situation that without prejudice to the utility model spiritual connotation, the equalization of doing changes and changes, and all should drop in protection domain of the present utility model.
Claims (7)
1. one kind has the valve actuating device that torsion spring is used the auxiliary cam driving, comprise exhaust rocker arm (1), auxiliary rocker arm (2) and pitman arm shaft (3), described auxiliary rocker arm (2) comprises rocker arrangement, oilhole device and valve opening device, described valve opening device comprises rocker shaft hole (201), driven valve opening (202), controls valve opening (203) and unidirectional valve opening (204), the upper oil circuit device of installing of described pitman arm shaft (3), exhaust rocker arm (1) and auxiliary rocker arm (2) are arranged adjacent each other on pitman arm shaft (3), it is characterized in that:
At the upper auxiliary cam (701) that increases of the camshaft (7) of motor, described auxiliary cam (701) drives auxiliary rocker arm (2) by auxiliary rocker arm roller (5) and rotates around pitman arm shaft (3);
Work at the valve actuating device, in the time of near 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, the lift effect of auxiliary cam (701) drives auxiliary rocker arm (2) promotion sliding pin (181) and makes exhaust valve (23) open, and carries out engine braking;
When the engine charge stroke, the lift effect of auxiliary cam (701) drives auxiliary rocker arm (2) promotion sliding pin (181) and makes exhaust valve (23) open, and carries out internal EGR; In addition,
At the upper returning apparatus of auxiliary rocker arm (2), one torsion spring (28) is arranged, described torsion spring (28) one ends are fixed on auxiliary rocker arm (2), the other end is fixed on pitman arm shaft (3), torsion spring (28) presses to auxiliary cam (701) with auxiliary rocker arm (2), and auxiliary rocker arm (2) is contacted with auxiliary cam (701).
2. the valve actuating device with the driving of torsion spring application auxiliary cam according to claim 1, is characterized in that: install in described driven valve opening (202) and adjust bolt (13), stop collar (14), driven spring (15), back-up ring (16) and servo valve (17).
3. the valve actuating device with the driving of torsion spring application auxiliary cam according to claim 1, is characterized in that: control valve (8), control valve return spring (9) and oil drain valve (10) are installed in described control valve opening (203).
4. according to claim 1 have torsion spring and use the valve actuating device that auxiliary cam drives, it is characterized in that: one-way valve (11) and one-way valve return spring (12) are installed in described unidirectional valve opening (204), and are realized sealing by interior hexagonal pyramidal plug screw (27) on the outer surface of auxiliary rocker arm.
5. according to claim 3 have torsion spring and use the valve actuating device that auxiliary cam drives, it is characterized in that: described control valve (8) comprises the first upper-end surface (801), the second upper-end surface (802) and lower end surface (803), the diameter of the 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 described control valve (8), high pressure oil acts on second upper-end surface (802) and lower end surface (803) of described control valve simultaneously, high pressure oil acts on pressure on the second upper-end surface (802) greater than the pressure that acts on lower end surface (803), when acting on the power on the first upper-end surface (801) greater than low pressure oil when pressure difference, described control valve (8) moves upward, high pressure oil gushes from oil drain valve (10).
6. according to claim 1 have torsion spring and use the valve actuating device that auxiliary cam drives, it is characterized in that: described 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.
7. according to claim 1 have torsion spring and use the valve actuating device that auxiliary cam drives, it is characterized in that: described sliding pin (181) is arranged on air valve bridge (18), and the shoulder in the middle of sliding pin (181) is connected with the shoulder in the upper sliding pin of air valve bridge (18) hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220455944.4U CN202926417U (en) | 2012-09-10 | 2012-09-10 | Air valve executing device with torsion spring and driven by auxiliary cam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220455944.4U CN202926417U (en) | 2012-09-10 | 2012-09-10 | Air valve executing device with torsion spring and driven by auxiliary cam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202926417U true CN202926417U (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220455944.4U Withdrawn - After Issue CN202926417U (en) | 2012-09-10 | 2012-09-10 | Air valve executing device with torsion spring and driven by auxiliary cam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202926417U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817665A (en) * | 2012-09-10 | 2012-12-12 | 浙江亿日气动科技有限公司 | Air valve executive device having torsion springs and driven by auxiliary cam |
-
2012
- 2012-09-10 CN CN201220455944.4U patent/CN202926417U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817665A (en) * | 2012-09-10 | 2012-12-12 | 浙江亿日气动科技有限公司 | Air valve executive device having torsion springs and driven by auxiliary cam |
| CN102817665B (en) * | 2012-09-10 | 2016-04-06 | 浙江亿日气动科技有限公司 | There is the valve actuating device that torsion spring application auxiliary cam drives |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130508 Effective date of abandoning: 20160406 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130508 Effective date of abandoning: 20160406 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |