CN203362250U - Variable valve system - Google Patents
Variable valve system Download PDFInfo
- Publication number
- CN203362250U CN203362250U CN 201320372733 CN201320372733U CN203362250U CN 203362250 U CN203362250 U CN 203362250U CN 201320372733 CN201320372733 CN 201320372733 CN 201320372733 U CN201320372733 U CN 201320372733U CN 203362250 U CN203362250 U CN 203362250U
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- Prior art keywords
- hydraulic piston
- valve
- variable valve
- piston body
- oilhole
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Abstract
The utility model discloses a variable valve system which comprises a variable valve and a variable valve control device. The variable valve is composed of a hydraulic piston body, a hydraulic piston, an adjusting cam, a torsional spring, an air valve and an air valve return spring. The variable valve system can reduce an air valve molded line at will at any phase position, adjusting is flexible, and the reliability is good. Due to the fact that the designed return spring can guarantee the adjusting cam to be in the largest lift, and when an engine cam is placed in a base circle position, the air valve is in a closed state. Therefore, when the adjusting cam is placed in other positions and the engine cam is placed in the base circle position, the air valve can still in the closed state, air valve air leakage accidents can not happen to an engine, and the performance and the safety can both be guaranteed. The variable valve system can be flexibly controlled to achieve the full variable valve phase position and lift, oil consumption can be maximally lowered, and noxious emissions can be reduced.
Description
Technical field
The utility model relates to a kind of engine valve actuating mechanism.
Background technique
Port timing directly affects the advancing of motor, gas performance, and the quality of combustion process is played to vital effect.In order to obtain engine performance preferably, port timing should change along with the variation of rotating speed and load.The changeable air valve technology, due to the advantage of self, day by day is subject to people and payes attention to.The variable valve system of petrol engine is comparatively obvious for improving whole performance, and in the low speed operating mode, because the existence of closure, the pumping loss of petrol engine is larger.The petrol engine changeable air valve can significantly reduce pumping loss, thereby reduces oil consumption.And for diesel engine, valve driving system stressed larger, structure relative complex, the realization difficulty of changeable air valve.But, along with research is in recent years found, the diesel engine changeable air valve not only can reduce pumping loss, all right control combustion boundary conditions, the Optimizing Combustion process, thus reduce discharge.Hence one can see that, and no matter the changeable air valve technology, to petrol engine or diesel engine all has very great meaning, is the effective means of energy-saving and emission-reduction.
The model utility content
Given this, the purpose of this utility model is to provide a kind of full lift range variable (VVL) mechanism, can control flexibly and realize full changing air valve phase and lift, makes every effort to maximize and reduces oil consumption and reduce noxious emission.
For solving above technical problem, the technological scheme that the utility model provides is, a kind of variable valve system is provided, comprise changeable air valve and variable valve control apparatus, described changeable air valve consists of hydraulic piston body, hydraulic piston, adjustment cam, torsion spring, valve and valve return: hydraulic piston is positioned at the hydraulic piston body, valve is connected with hydraulic piston, and between valve and hydraulic piston, valve return is installed; Adjusting cam is arranged in the hydraulic piston body by adjusting camshaft, adjust cam between the upper base and hydraulic piston of hydraulic piston body, and forming higher pair mechanism with hydraulic piston body, hydraulic piston respectively, the basic circle of adjustment cam and the upper base internal surface of hydraulic piston body are tangent; Adjust on camshaft torsion spring is installed; Be provided with the first oilhole and the second oilhole on the hydraulic piston body, the first oilhole and the second oilhole are connected with respectively variable valve control apparatus.
Further, described adjustment cam is divided into two little hydraulic pressure cavity by the hydraulic pressure cavity of hydraulic piston body.
Further, described the first oilhole and the second oilhole lay respectively at and adjust the cam both sides.
Further, described torsion spring is positioned at the external side of hydraulic piston.
Further, described variable valve control apparatus consists of pump, oil pipe, common rail pipe and two-bit triplet solenoid valve, the control oilhole of two-bit triplet solenoid valve is connected with an oilhole on the hydraulic piston body by oil pipe, the oil inlet hole of two-bit triplet solenoid valve is connected with common rail pipe by oil pipe, and common rail pipe is connected with oil pump by oil pipe; Oil pump connects fuel tank by oil pipe again; The oil outlet of two-bit triplet solenoid valve, common rail pipe are connected with fuel tank by return tube.
Compared with prior art, the utlity model has following advantage:
1, the utility model can be realized when arbitrary phase the reducing arbitrarily of valve molded line, flexible adjustment, good reliability.
2, the return spring power due to design can guarantee that the adjustment cam is in maximum lift, and engine cam is when the basic circle position, and valve is in closed condition.Adjust so cam in other position, and engine cam is when the basic circle position, valve still can be in closed condition, so motor not there will be the accident of valve blow-by, performance and safety can be protected.
3, this New Energy is controlled flexibly and is realized full changing air valve phase and lift, can maximize and reduce oil consumption and reduce noxious emission.
The accompanying drawing explanation
Fig. 1 is the variable valve timing structure schematic diagram of the utility model one preferred embodiment.
Fig. 2 is the variable valve system connection diagram of the utility model one preferred embodiment.
Fig. 3 is two-bit triplet solenoid valve cross-sectional schematic in the utility model one preferred embodiment.
Embodiment
Below in conjunction with accompanying drawing and a specific embodiment, describe.
Referring to Fig. 1 to Fig. 3.The present embodiment is for the distribution device of overhead-cam, increased an adjustable length hydraulic piston mechanism between engine cam 300 and valve 106, and its principle is the variation that the lift by changing piston realizes valve molded line rule.The described variable valve system of the present embodiment, comprise changeable air valve and variable valve control apparatus two-part.Changeable air valve consists of hydraulic piston body 100, hydraulic piston 101, adjustment cam 104, torsion spring, valve 106 and valve return 107.Described variable valve control apparatus consists of pump, oil pipe, common rail pipe and two-bit triplet solenoid valve.
Adjusting cam 104 is the symmetrical solid of face.Adjusting cam 104 is arranged in hydraulic piston body 100 by adjusting camshaft 105, adjust cam 104 between the upper base and hydraulic piston 101 of hydraulic piston body 100, and forming higher pair mechanism with hydraulic piston body 100, hydraulic piston 101 respectively, the basic circle of adjustment cam 104 and the upper base internal surface of hydraulic piston body 100 are tangent.Adjust cam 104 hydraulic pressure cavity of hydraulic piston body 100 is divided into to two little hydraulic pressure cavity: hydraulic pressure cavity one and hydraulic pressure cavity two.Adjust camshaft 105 and be arranged on hydraulic piston body 100, but flexible rotating.Adjust on camshaft 105 torsion spring is installed, this torsion spring is positioned at hydraulic piston body 100 outsides.When adjusting cam 104 at initial position, the horizontal applied force that both sides hydraulic pressure cavity pressure difference causes only equates with the torsion spring pretightening force on adjustment camshaft 105 that the horizontal force direction is in state of equilibrium; Vertical direction is also in state of equilibrium.Along with two hydraulic pressure cavity pressure change, the horizontal direction force disequilibrium, adjust cam and start to rotate, the volume-variation on both sides now, and torsion spring elastic force changes, until next equilibrium of forces point is adjusted cam and stopped operating, the hydraulic piston height changes thereupon.
Be provided with the first oilhole 102 and the second oilhole 103, the first oilholes 102 and the second oilhole 103 on hydraulic piston body 100 and be connected with respectively variable valve control apparatus.The first oilhole 102 is oil duct through holes of hydraulic pressure cavity one, and the second oilhole 103 is oil duct through holes of hydraulic pressure cavity two.
Variable valve control apparatus consists of pump, oil pipe, common rail pipe and two-bit triplet solenoid valve.Each oilhole on hydraulic piston body 100 connects a two-bit triplet solenoid valve, and is connected by oil pipe with the control oilhole 212 of two-bit triplet solenoid valve.The oil inlet hole 211 that the first oilhole 102 connects the first two-bit triplet solenoid valve 210, the first two-bit triplet solenoid valves 210 is connected with the first common rail pipe 201 by oil pipe again, is connected the oil transportation end of pump 200 by oil pipe with the first common rail pipe 201.The oil pumping end of pump 200 connects fuel tank 400 by oil pipe.Simultaneously, the oil outlet 213 of the first two-bit triplet solenoid valve is connected fuel tank with the first common rail pipe 201 by return tube.According to identical Placement, the second oilhole 103 connects the second two-bit triplet solenoid valve 220, the second two-bit triplet solenoid valves 220 and connects the second common rail pipe 202, the second common rail pipes 202 connection pumps 200.
The electromagnetic control fuel tap divides Electromagnetic Control section and two parts of oil circuit control device.The oil circuit control device is divided into oily section and fuel-displaced section of oil-feed section, control successively, is provided with sealed seat surface between adjacent both ends.The oil-feed section is provided with oil inlet hole 211, and control oil section is provided with control oilhole 212, and fuel-displaced section is provided with oil outlet 213.Oiling valve 215 and return spring 217 are installed in the oil-feed section.When the sealed seat surface between oiling valve 215 and oil-feed section, control oil section is fitted, the oil-feed section is cut off fully with control oil section, controls oilhole 212 and is communicated with an oily passage of formation with oil outlet 213.Outlet valve 216 is installed in fuel-displaced section, and when outlet valve 216 and control oil section, the sealed seat surface laminating between fuel-displaced section, control oil section and fuel-displaced section are separated fully, and oil inlet hole 211 and control oilhole 212 are communicated with an oily passage of formation.Above-mentioned oiling valve 215 is fixedly connected with by connecting rod with described outlet valve 216, and the length of this connecting rod is greater than the distance of two sealed seat surfaces, more precisely, be oiling valve 215 and outlet valve 216 at a time can only with two sealed seat surfaces in a laminating.
The pressure of hydraulic pressure cavity is controlled by common rail pressure and two-bit triplet solenoid valve, its concrete control principle is as follows: when electromagnet coil power, the electromagnetic force that armature produces by push rod 214 and connecting rod make outlet valve 216 together with oiling valve 215 to left movement, until outlet valve 216 is close to its sealed seat surface.Now, oil outlet 213 is closed, oil inlet hole 211 is opened, and the machine oil in common rail pipe enters control oilhole 212 by oil inlet hole 211, and control oilhole 212 is communicated with hydraulic pressure cavity, now unequal due to the pressure of hydraulic pressure cavity one and hydraulic pressure cavity two, adjusts cam 104 and starts to rotate.When electromagnet cuts off the power supply, oiling valve 215 and oiling valve 215, under the effect of hydraulic coupling and return spring 217, move right, and oiling valve 215 is close to its sealed seat surface.Now, oil inlet hole 211 is closed, and oil outlet 213 is opened, and the machine oil in hydraulic pressure cavity is got back to oil outlet 213 from control oilhole 212 and entered fuel tank 400, and the pressure of hydraulic pressure cavity starts to descend, and adjusts cam 104 and rotates, and makes it to reach the equilibrium of forces state.
The machine oil of variable valve system derives from engine sump tank, the power source of pump is bent axle, when rotating speed and the throttle position signal that ECU obtains the motor operation, determines the residing operating mode of motor, the dependence interpolation of tabling look-up, obtain two common rail pipes target common rail pressure separately by the inner MAP data of ECU.If actual common rail pressure is greater than goal pressure, pump quits work, if actual common rail pressure is less than goal pressure, pump is started working.Pressure difference value in common rail pressure and hydraulic pressure cavity is adjusted during by the two-bit triplet valve events, can realize closed loop control.
When motor keeps former lift, changeable air valve need guarantee to adjust cam 104 and turn to maximum lift position.Because the molded line of adjusting cam 104 is symmetry status, and adjust camshaft 105 in the centre on hydraulic piston body 100 tops, make two piston cavity volumes identical, the volume of hydraulic pressure cavity one equals the volume of hydraulic pressure cavity two.Engine cam 300 when the basic circle position, guarantee valve under the active force of return spring in closed condition.Now the volume of hydraulic pressure cavity one equals the volume of hydraulic pressure cavity two, and in order to realize state of equilibrium, the pressure that needs to control in hydraulic pressure cavity one equals the pressure in hydraulic pressure cavity two.When this distribution device need to realize lift reduce to adjust the time, adjust the pressure in hydraulic pressure cavity one, make its increase or reduce, at this moment, adjusting cam starts to rotate, under the making a concerted effort of engine cam and valve return, adjust cam all the time with hydraulic piston body top inner wall and hydraulic piston Surface Contact, make hydraulic pressure cavity one with hydraulic pressure cavity two all the time in isolation.Now two hydraulic pressure cavity volumes are no longer equal, and whole hydraulic piston volume reduces, and engine air valve lift reduces than former machine lift, realizes the variation of distribution device valve molded line.
Be below only preferred implementation of the present utility model, it should be pointed out that above-mentioned preferred implementation should not be considered as restriction of the present utility model, protection domain of the present utility model should be as the criterion with the claim limited range.For those skilled in the art, within not breaking away from spirit and scope of the present utility model, can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (5)
1. a variable valve system, it is characterized in that, comprise changeable air valve and variable valve control apparatus, described changeable air valve consists of hydraulic piston body (100), hydraulic piston (101), adjustment cam (104), torsion spring, valve (106) and valve return (107): hydraulic piston (101) is positioned at hydraulic piston body (100), valve (106) is connected with hydraulic piston (101), and between valve (106) and hydraulic piston (101), valve return (107) is installed; Adjusting cam (104) is arranged in hydraulic piston body (100) by adjusting camshaft (105), adjusting cam (104) is positioned between the upper base and hydraulic piston (101) of hydraulic piston body (100), and forming higher pair mechanism with hydraulic piston body (100), hydraulic piston (101) respectively, the basic circle of adjustment cam (104) and the upper base internal surface of hydraulic piston body (100) are tangent; Adjust on camshaft (105) torsion spring is installed; Be provided with the first oilhole (102) and the second oilhole (103) on hydraulic piston body (100), the first oilhole (102) and the second oilhole (103) are connected with respectively variable valve control apparatus.
2. variable valve system according to claim 1, is characterized in that, described adjustment cam (104) is divided into two little hydraulic pressure cavity by the hydraulic pressure cavity of hydraulic piston body (100).
3. variable valve system according to claim 1, is characterized in that, described the first oilhole (102) and the second oilhole (103) lay respectively at adjusts cam (104) both sides.
4. variable valve system according to claim 1, is characterized in that, described torsion spring is positioned at hydraulic piston body (100) outside.
5. variable valve system according to claim 1, it is characterized in that, described variable valve control apparatus consists of pump, oil pipe, common rail pipe and two-bit triplet solenoid valve, the control oilhole (212) of two-bit triplet solenoid valve is connected with an oilhole on hydraulic piston body (100) by oil pipe, the oil inlet hole of two-bit triplet solenoid valve (211) is connected with common rail pipe by oil pipe, and common rail pipe is connected with oil pump by oil pipe; Oil pump connects fuel tank (400) by oil pipe again; The oil outlet of two-bit triplet solenoid valve (213), common rail pipe are connected with fuel tank (400) by return tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320372733 CN203362250U (en) | 2013-06-26 | 2013-06-26 | Variable valve system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320372733 CN203362250U (en) | 2013-06-26 | 2013-06-26 | Variable valve system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203362250U true CN203362250U (en) | 2013-12-25 |
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ID=49810035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320372733 Expired - Fee Related CN203362250U (en) | 2013-06-26 | 2013-06-26 | Variable valve system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203362250U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120155A (en) * | 2017-06-02 | 2017-09-01 | 中国北方发动机研究所(天津) | Engine and its control method with piston built-in valve and overhead changeable air valve |
-
2013
- 2013-06-26 CN CN 201320372733 patent/CN203362250U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120155A (en) * | 2017-06-02 | 2017-09-01 | 中国北方发动机研究所(天津) | Engine and its control method with piston built-in valve and overhead changeable air valve |
| CN107120155B (en) * | 2017-06-02 | 2019-03-22 | 中国北方发动机研究所(天津) | Engine and its control method with piston built-in valve and overhead changeable air valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 Termination date: 20160626 |