CN202926418U - Frame type air valve executing device with auxiliary rocker arm and driven by auxiliary cam - Google Patents
Frame type air valve executing device with auxiliary rocker arm and driven by auxiliary cam Download PDFInfo
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- CN202926418U CN202926418U CN201220455966.0U CN201220455966U CN202926418U CN 202926418 U CN202926418 U CN 202926418U CN 201220455966 U CN201220455966 U CN 201220455966U CN 202926418 U CN202926418 U CN 202926418U
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Abstract
The utility model provides a frame type air valve executing device with an auxiliary rocker arm and driven by an auxiliary cam. The frame type air valve executing device mainly comprises a frame, an active valve and a servo valve, wherein the active valve and the servo valve are installed on the frame, the active valve is connected with the auxiliary rocker arm, and an auxiliary idler wheel is installed on an idle wheel shaft at the tail end of the auxiliary rocker arm. The auxiliary cam is added to the camshaft of an engine. The active valve is installed in an active valve hole and is connected with a baffle. When the frame type air valve executing device works, engine oil is filled in high pressure oil lines, the active valve slides out of the active valve hole under the action of the oil pressure, the lift range action of the auxiliary cam drives the active valve to move, and transmits to the servo valve through the high pressure oil lines, the servo valve is pressed to a sliding pin, and the sliding pin moves downward to open an exhaust valve to achieve the brake or the internal exhaust gas recirculation (EGR) of the engine. When the engine oil pressure of the oil lines of the frame is too big, the frame type air valve executing device with the auxiliary rocker arm 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 frame type valve actuating device that auxiliary rocker arm is used the auxiliary cam driving that has is provided, realize 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 frame type valve actuating device with the driving of auxiliary rocker arm application auxiliary cam mainly comprises framework, aggressive valve and servo valve, and aggressive valve and servo valve are arranged on framework, increase an auxiliary cam on the camshaft of motor; Described framework comprises initiatively valve opening, driven valve opening, control valve opening and unidirectional valve opening; Described aggressive valve connects auxiliary rocker arm; Described aggressive valve is arranged in described active valve opening; Baffle plate is connected screw and is connected with framework, described aggressive valve is connected with baffle plate; Auxiliary rocker arm is arranged on pitman arm shaft, can rotate around pitman arm shaft, and auxiliary wheel is arranged on the roller shaft of auxiliary rocker arm end; When frame type valve actuating device is worked, be full of machine oil in high-pressure oil passage, aggressive valve skids off in the active valve opening under the effect of oil pressure, aggressive valve contacts with auxiliary cam by 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, servo valve presses to sliding pin, sliding pin moves downward, open exhaust valve and realize engine braking near engine compresses stroke top dead center, open exhaust valve and realize internal EGR when the engine charge stroke.
According to the described frame type valve actuating device with the driving of auxiliary rocker arm application auxiliary cam of the utility model preferred embodiment, when described servo valve is not worked at frame type valve actuating device, do not affect the motion of exhaust valve.
According to the described frame type valve actuating device with the driving of auxiliary rocker arm application auxiliary cam of the utility model preferred embodiment, install in described driven valve opening and adjust bolt, servo valve, servo valve return spring, back-up ring and locking nut; Control valve, control valve return spring and oil drain valve are installed in described control valve opening; 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 framework.
According to the described frame type valve actuating device with the driving of auxiliary rocker arm application auxiliary cam of the utility model preferred embodiment, when engine work, there is no machine oil in described high-pressure oil passage, aggressive valve is pressed in the active valve opening by baffle plate, and having certain interval between auxiliary cam, 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 air valve bridge, have certain gap between servo valve and sliding pin;
Described control valve is pressed towards under the effect of control valve return spring to be controlled in valve opening, and high-pressure oil passage and oil drain valve communicate, and the machine oil in high-pressure oil passage can be gushed by oil drain valve, and described one-way valve is pressed towards in unidirectional valve opening under the effect of one-way valve return spring.
According to the described frame type valve actuating device with the driving of auxiliary rocker arm application auxiliary cam of the utility model preferred embodiment, during the work of frame type valve actuating device, described control valve is blocked the oil drain valve on framework, described one-way valve is opened the oilhole that leads to high-pressure oil passage, machine oil enters 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 frame type valve actuating device with the driving of auxiliary rocker arm application auxiliary cam of the utility model preferred embodiment, described control valve comprises the first end face, the second end face and the 3rd end face, the diameter of the second end face is greater than the diameter of the 3rd end face, low pressure oil acts on the first end face of described control valve, high pressure oil acts on the second end face and the 3rd end face of described control valve simultaneously, high pressure oil acts on pressure on the second end face greater than the pressure that acts on the 3rd end face, when acting on the pressure on the first end face greater than low pressure oil when pressure difference, control valve moves downward, high pressure oil gushes from oil drain valve.
According to the described frame type valve actuating device with the driving of auxiliary rocker arm application auxiliary cam of the utility model preferred embodiment, described auxiliary cam comprises peach and basic circle.
According to the described frame type valve actuating device with the driving of auxiliary rocker arm application auxiliary cam of the utility model preferred embodiment, 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 aggressive valve 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 oil circuit on framework 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 on framework in oil circuit 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 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 that drives of auxiliary cam;
Fig. 3 is the sectional view of the frame type valve actuating device aggressive valve position that drives of auxiliary cam;
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 engine work, control each part position detailed view in valve opening and unidirectional valve opening;
When Fig. 8 is the frame type valve actuating device work of auxiliary cam driving, control each part position detailed view 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 frame type 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 the structural drawing of the second aggressive valve device;
Figure 12 is the detailed view of control valve.
Embodiment
The technical solution of the utility model is: arrange initiatively valve opening 101 on framework 1, driven valve opening 102, control valve opening 103 and unidirectional valve opening 104, oilhole 110 connected electromagnetic valves and low pressure oil way 120, oilhole 111 connects low pressure oil way 120 and controls valve opening 103 and unidirectional valve opening 104, oilhole 112 connects unidirectional valve opening 104 and high-pressure oil passage 130, and oilhole 113 connects controls valve opening 103 and high-pressure oil passage 130.Low pressure oil is by the solenoid valve 22 on cylinder cap, pitman arm shaft or miscellaneous part supply framework.Air valve bridge 19 is positioned on exhaust valve 20 and exhaust valve 21, and the sliding pin 191 on air valve bridge 19 is between exhaust valve 20 and servo valve 15; The auxiliary wheel 5 that auxiliary cam 701 drives on aggressive valve 2, the motion of aggressive valve 2 passes to servo valve 15 through high pressure oil, opens exhaust valve 20 and realize engine braking or open exhaust valve 20 in aspirating stroke and realize internal EGR near engine compresses stroke top dead center; Baffle plate 3 makes between auxiliary wheel 5 on aggressive valve 2 and auxiliary cam 701 certain gap.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.
To shown in Figure 6, the frame type valve actuating device that application auxiliary cam of the present utility model 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, adjusts 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 as 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, for flowing of gas between control engine internal furnace and intake and exhaust manifold.The frame type valve actuation system of using the auxiliary cam driving 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 framework 1.Aggressive valve 2 passes motion to servo valve 15 under the driving of camshaft 7 or other devices.
Exhaust rocker arm drives simultaneously exhaust valve 20 by air valve bridge 19 and exhaust valve 21 is realized exhaust stroke.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 unlatching exhaust valves 20 that servo valve 15 optionally drives on air valve bridge 19 are realized engine braking or internal EGR function.On shoulder in the middle of sliding pin 191 and air valve bridge 19, the shoulder in sliding pin hole coordinates.
As shown in Figure 5 and 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 way 120 through oilhole 110 from solenoid valve, machine oil in low pressure oil way 120 enters into through oilhole 111 and controls valve opening 103 and unidirectional valve opening 104, low pressure oil enters into high-pressure oil passage 130 through oilhole 112 from unidirectional valve opening 104, high pressure oil can flow back to through oilhole 113 controls valve opening 103, 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 arranged on framework 1, and oil circuit can be arranged in cylinder cap or camshaft support and provide machine oil for the solenoid valve 22 on framework 1.By 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 way.
Comprise one on framework 1 by cam-actuated aggressive valve assembly.The aggressive valve assembly is arranged on 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 in the interior slip of active valve opening 101 of framework 1 end.Auxiliary wheel 5 is arranged on the roller shaft 6 of aggressive valve 2 ends, baffle plate 3 one ends are fixed on 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 701 on camshaft 7, the braking lift is inoperative.
Another embodiment as 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 in the interior slip of active valve opening 101 of framework 1 end.Auxiliary rocker arm 32 is arranged on pitman arm shaft, can rotate around pitman arm shaft, auxiliary wheel 5 is arranged on the roller shaft 6 of auxiliary rocker arm 32 ends, and the auxiliary rocker arm 32 optionally aggressive valve on driver framework 12 is opened exhaust valves 20 and realized engine braking or internal EGR function.Baffle plate 3 one ends are fixed on 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 701 on camshaft 7, and the braking lift is inoperative.
Comprise the servo valve assembly that drives exhaust valve 20 on framework 1.The servo valve assembly is arranged on the front end of framework 1, and the servo valve assembly comprises adjusts bolt 14, servo valve 15, servo valve return spring 16, back-up ring 17, locking nut 18.Servo valve 15 can be in the interior slip of driven valve opening 102 of framework 1 front end.Servo valve 15 is stepped, is respectively the first upper-end surface 151, the second upper-end surface 152 and lower end surface 153, the first upper-end surface 151 diameters greater than the diameter of lower end surface 153, and the first upper-end surface 151 and adjustment bolt 14 bottom connections touch.Back-up ring 17 is arranged on 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 191 on air valve bridge 19, has certain gap thereby make between servo valve lower end surface 153 and sliding pin 191.Adjust bolt 14 outstanding by the top of driven valve opening 102, regulate the length of adjusting in the bolt 14 driven valve openings 102 of screw-in, can regulate the gap between sliding pin 191 on servo valve 15 and air valve bridge.Adjust bolt 14 by locking nut 18 lockings.
The front end of framework 1 is arranged control valve opening 103 and unidirectional valve opening 104, and control valve 8, control valve return spring 9, oil drain valve 10 are positioned at and control valve opening 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 the machine oil in low pressure oil way 120 and controls valve opening 103 and unidirectional valve opening 104, and low pressure oil enters into high-pressure oil passage 130 through oilhole 112.Unidirectional valve opening 104 can be realized by interior hexagonal pyramidal plug screw 13 sealing on the outer surface of framework 1.
as Fig. 7, Fig. 8 and shown in Figure 12, control valve 8 comprises the first end face 801, the second end face 802 and the 3rd end face 803, the low pressure oil of oilhole 111 acts on the first end face 801, the high pressure oil of oilhole 113 acts on the second end face 802 and the 3rd end face 803 simultaneously, the diameter of the second end face 802 is greater than the diameter of the 3rd end face 803, high pressure oil acts on power on the second end face 802 greater than the power that acts on the 3rd end face 803, when acting on the power on the first end face 801 greater than low pressure oil when pressure difference, control valve 8 moves downward, oilhole 113 and oil drain valve 10 communicate, high pressure oil in high-pressure oil passage 130 gushes, when avoiding engine frame formula 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 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 enters unidirectional valve opening 104 simultaneously, promoting one-way valve 11 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 way 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 to control in valve opening, and control valve return spring 9 is fixed on by oil drain valve and controls in valve opening 103; One-way valve return spring 12 is pushed one-way valve in unidirectional valve opening 104 to, and one-way valve return spring 12 is fixed in unidirectional valve opening 104 by interior hexagonal pyramidal plug screw.
Another kind of embodiment, be the another kind of structural type of one-way valve as shown in Figure 9 and Figure 10, comprises ball-type check valve 24, one-way 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 coordinate, upper end and one-way valve seat 25 coordinate, arrange return spring 27 between ball-type check valve 24 upper ends and one-way valve seat 25, return spring 27 presses to unidirectional valve gap 26 with ball-type check valve 24, oilhole 251 is arranged on one-way valve seat 25, 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 way 120 in the other direction by driven valve opening 102.
Below will introduce in detail the working procedure of the frame type valve actuation system of using the auxiliary cam driving, Crankshaft motion drives camshaft 7 rotations.Camshaft 7 drives exhaust rocker arm open and close exhaust valve 20, exhaust valve 21 is realized exhaust stroke; Aggressive valve 2 on auxiliary cam 701 driver frameworks 1 on camshaft 7 realizes engine braking or internal EGR function.
Arrive shown in Figure 6 as Fig. 1, during engine work, closed electromagnetic valve, do not provide machine oil for the low pressure oil way 120 on framework 1, engine oil pressure in 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 enter 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 bottom connection of servo valve 15 and adjustment bolt 14 touches, regulate the length of adjusting bolt screw-in framework 1 and can adjust the gap between sliding pin 191 on servo valve 15 and air valve bridge 19, the exhaust valve lift of damped condition can be controlled in this gap.Aggressive valve 2 under the effect of baffle plate 3 away from the auxiliary cam 701 on camshaft 7, auxiliary cam 701 separates with auxiliary wheel 5, auxiliary lift is inoperative.Camshaft 7 rotations, the gap between auxiliary cam 701 and auxiliary wheel 5 overcomes auxiliary lift, and is inoperative to the aggressive valve on framework 1, and servo valve 15 does not drive sliding pin 191, does not affect the work of exhaust valve 20.
Arrive shown in Figure 6 as Fig. 1, during the work of engine frame formula valve actuating device, solenoid valve is opened, the oilhole 110 that machine oil enters through solenoid valve 22, machine oil in oilhole 110 enters into oilhole 111 through low pressure oil way 120, machine oil enters into unidirectional valve opening 104 through oilhole 111, promote one-way valve compression one-way valve return spring 12, 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 high-pressure oil passage 130 flow back into low pressure oil way 120.Machine oil enters into simultaneously controls valve opening 103, promotes control valve 8 compression control valve return springs 9 oil drain valve 10 is blocked.Servo valve 15 moves downward compression servo valve return spring 16 in the effect of engine oil pressure, contact with sliding pin 191 on air valve bridge 19, and driven valve opening of while upper end is full of machine oil.Aggressive valve 2 along active valve opening 101 down slidings, contacts with auxiliary wheel 5 under the effect of high pressure oil.Camshaft 7 rotations, auxiliary cam 701 drives auxiliary wheel 5, aggressive valve 2 is along active valve opening 101 upward slidings, incompressibility according to machine oil, the motion of aggressive valve passes to servo valve 15 through high pressure oil, servo valve 15 is along driven valve opening 102 down slidings, and the sliding pin 191 unlatching exhaust valves 20 that drive on air valve bridge 19 are realized engine braking or internal EGR.
When engine frame formula valve actuating device is not worked, closed electromagnetic valve, engine oil pressure in high-pressure oil passage 130 is reduced near 0, control valve 8 presses under the effect of control valve return spring 9 in control valve hole 103, oilhole 113 and oil drain valve 10 connect, initiatively the machine oil in valve opening 101 and driven valve opening 102 flows into oil drain valve 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, 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 aggressive valve 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 oil circuit on framework 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 on framework in oil circuit 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 frame type valve actuating device that auxiliary rocker arm is used the auxiliary cam driving, mainly comprise framework (1), aggressive valve (2), servo valve (15), aggressive valve (2) and servo valve (15) are arranged on framework (1), described framework (1) comprises initiatively valve opening (101), driven valve opening (102), control valve opening (103) and unidirectional valve opening (104), it is characterized in that:
At the upper auxiliary cam (701) that increases of the camshaft (7) of motor;
Described aggressive valve (2) connects auxiliary rocker arm (32); Described aggressive valve (2) is arranged in described active valve opening (101); Baffle plate (3) is connected 1 with framework) connect with screw (4), described aggressive valve (2) is connected 3 with baffle plate) connect; Auxiliary rocker arm (32) is arranged on pitman arm shaft, can rotate around pitman arm shaft, and auxiliary wheel (5) is arranged on the roller shaft (6) of auxiliary rocker arm (32) end;
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) by auxiliary wheel (5), the lift effect of auxiliary cam (701) drives aggressive valve (2) and moves towards framework (1), the motion of aggressive valve (2) is delivered to servo valve (15) through high-pressure oil passage (130), servo valve (15) presses to sliding pin (191), sliding pin (191) moves downward, open exhaust valve (20) in the time of near engine compresses stroke top dead center and realize engine braking, realize internal EGR and open exhaust valve (20) when the engine charge stroke.
2. according to claim 1 have auxiliary rocker arm and use the frame type valve actuating device that auxiliary cam drives, and it is characterized in that:
Install in described driven valve opening (102) and adjust bolt (14), servo valve (15), servo valve return spring (16), back-up ring (17) and locking nut (18);
Control valve (8), control valve return spring (9) and oil drain valve (10) are installed in described control valve opening (103);
One-way valve (11) and one-way valve return spring (12) are installed in described unidirectional valve opening (104), and are realized sealing by interior hexagonal pyramidal plug screw (13) on the outer surface of framework (1).
3. according to claim 2 have auxiliary rocker arm and use the frame type valve actuating device that auxiliary cam drives, and it is characterized in that: when engine work,
Described high-pressure oil passage does not have machine oil in (130), and aggressive valve (2) is pressed in active valve opening (101) by baffle plate (3), and has certain interval between 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 air valve bridge (19), have certain gap between servo valve (15) and sliding pin (191);
Described control valve (8) is pressed towards under the effect of control valve return spring (9) to be controlled in valve opening (103), high-pressure oil passage (130) and oil drain valve communicate, machine oil in high-pressure oil passage (130) can be gushed by oil drain valve, and described one-way valve (11) is pressed towards under the effect of one-way valve return spring (12) in unidirectional valve opening (104).
4. according to claim 2 have auxiliary rocker arm and use the frame type valve actuating device that auxiliary cam drives, it is characterized in that: during the work of frame type valve actuating device, described control valve (8) is blocked the oil drain valve on framework (1), described one-way valve (11) is opened the oilhole that leads to high-pressure oil passage (130), machine oil enters 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).
5. according to claim 2 have auxiliary rocker arm and use the frame type valve actuating device that auxiliary cam drives, it is characterized in that: described control valve (8) comprises the first end face (801), the second end face (802) and the 3rd end face (803), the diameter of the 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 described control valve (8), high pressure oil acts on the second end face (802) and the 3rd end face (803) of described control valve (8) simultaneously, high pressure oil acts on pressure on the second end face (802) greater than the pressure that acts on the 3rd end face (803), when acting on the pressure on the first end face (801) greater than low pressure oil when pressure difference, control valve (8) moves downward, high pressure oil gushes from oil drain valve (10).
6. according to claim 1 have auxiliary rocker arm and use the frame type valve actuating device that auxiliary cam drives, and it is characterized in that: described auxiliary cam (701) comprises peach (711) and basic circle (721).
7. according to claim 1 have auxiliary rocker arm and use the frame type valve actuating device that auxiliary cam drives, it is characterized in that: described sliding pin (191) is arranged on air valve bridge (19), and the shoulder in the middle of sliding pin (191) and air valve bridge (19) the upward shoulder in sliding pin hole are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220455966.0U CN202926418U (en) | 2012-09-10 | 2012-09-10 | Frame type air valve executing device with auxiliary rocker arm and driven by auxiliary cam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220455966.0U CN202926418U (en) | 2012-09-10 | 2012-09-10 | Frame type air valve executing device with auxiliary rocker arm and driven by auxiliary cam |
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| Publication Number | Publication Date |
|---|---|
| CN202926418U true CN202926418U (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220455966.0U Withdrawn - After Issue CN202926418U (en) | 2012-09-10 | 2012-09-10 | Frame type air valve executing device with auxiliary rocker arm and driven by auxiliary cam |
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| Country | Link |
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| CN (1) | CN202926418U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817667A (en) * | 2012-09-10 | 2012-12-12 | 浙江亿日气动科技有限公司 | Frame-type exhaust-valve executive device with auxiliary rocker arm driven by auxiliary cam |
| CN103967549A (en) * | 2014-05-21 | 2014-08-06 | 中国第一汽车股份有限公司 | One-cylinder multiple-cam combined type cam shaft |
| CN108661745A (en) * | 2018-07-10 | 2018-10-16 | 浙江黎明发动机零部件有限公司 | A kind of electromagnetic control type engine braking apparatus |
| CN110425015A (en) * | 2019-09-10 | 2019-11-08 | 浙江黎明智造股份有限公司 | A kind of hydraulically-controlled type engine braking apparatus |
-
2012
- 2012-09-10 CN CN201220455966.0U patent/CN202926418U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102817667A (en) * | 2012-09-10 | 2012-12-12 | 浙江亿日气动科技有限公司 | Frame-type exhaust-valve executive device with auxiliary rocker arm driven by auxiliary cam |
| CN102817667B (en) * | 2012-09-10 | 2016-02-03 | 浙江亿日气动科技有限公司 | There is the frame type valve actuating device that auxiliary rocker arm application auxiliary cam drives |
| CN103967549A (en) * | 2014-05-21 | 2014-08-06 | 中国第一汽车股份有限公司 | One-cylinder multiple-cam combined type cam shaft |
| CN108661745A (en) * | 2018-07-10 | 2018-10-16 | 浙江黎明发动机零部件有限公司 | A kind of electromagnetic control type engine braking apparatus |
| CN108661745B (en) * | 2018-07-10 | 2023-11-21 | 浙江黎明智造股份有限公司 | Electromagnetic control type engine braking device |
| CN110425015A (en) * | 2019-09-10 | 2019-11-08 | 浙江黎明智造股份有限公司 | A kind of hydraulically-controlled type engine braking apparatus |
| CN110425015B (en) * | 2019-09-10 | 2024-02-27 | 浙江黎明智造股份有限公司 | Hydraulic control type engine braking device |
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