CN101900003B - Internal combustion engine distribution mechanism with continuously variable valve stroke and control method thereof - Google Patents
Internal combustion engine distribution mechanism with continuously variable valve stroke and control method thereof Download PDFInfo
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- CN101900003B CN101900003B CN2010102324331A CN201010232433A CN101900003B CN 101900003 B CN101900003 B CN 101900003B CN 2010102324331 A CN2010102324331 A CN 2010102324331A CN 201010232433 A CN201010232433 A CN 201010232433A CN 101900003 B CN101900003 B CN 101900003B
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- valve
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- cam
- roller
- distribution mechanism
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- 238000009826 distribution Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000002485 combustion reaction Methods 0.000 title abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- 239000000446 fuel Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention provides a simple-structure low-cost internal combustion engine distribution mechanism with a continuously variable valve stroke and a control method thereof, which aims at improving output and fuel consumption conditions of an internal combustion engine. The distribution mechanism comprises a cam driven by a camshaft, a rocker arm driven by the cam, a valve controlled by the rocker arm and a valve spring for driving the valve to reset, wherein one end of the rocker arm abuts against the cam and is tangential to the cam, and the other end is in movable connection with the top end of the valve. A spindle driven by a stepping motor is arranged above the rocker arm and is provided with a roller through a rolling wheel support. The top surface of the rocker arm is an arc surface corresponding to the motion trail of the roller, and the roller is in tight contact with the arc surface. By arranging the support part which can be driven by a control mechanism to move in the length direction of the rocker arm, the distribution mechanism can continuously change the distance between the valve and the support part as well as the distance between the cam and the support part so as to continuously change the valve stroke, thereby realizing the purpose of improving output and fuel consumption conditions of an internal combustion engine.
Description
Technical field
The invention belongs to internal combustion engine system technology for making field, specially refer to the distribution device and the controlling method thereof of internal-combustion engine.
Background technique
On the gas distribution system of reciprocating internal combustion engine; The lift of valve generally is fixing immutable, but internal-combustion engine is when particularly petrol engine moves under different working conditions, different rotating speed, and is also different to the requirement of gas distribution system; For example say: require less valve lift during low speed; Can produce bigger air-intake negative-pressure and more eddy current, let air and fuel oil fully mix, thereby the torsion when improving the slow-speed of revolution is exported; Require bigger valve lift during high speed; Make the breathing of motor more smooth and easy; Powerful power output when obtaining high rotating speed, this just needs the variable valve lift of the cover demand under the incompatible satisfied different operating modes that matches with it, to reach the purpose that improves output and improve fuel consumption.
The internal-combustion engine that can change valve lift at present is many, and for example (number of patent application: 200410083212) disclosed variable valve actuator for air has a switching mechanism and is used for the cam displacement is passed to first rocking arm from second rocking arm patent " variable valve mechanism for engine ".Camshaft is placed on the oblique upper of pitman arm shaft.First adjacent part and second adjacent part are placed in the dead band between the side of upside and camshaft of pitman arm shaft.First adjacent part rotates mobile along the direction and first rocking arm that rocking arm rotates together.Second adjacent part and second rocking arm rotate mobile together.Second adjacent part nestles up first adjacent part from the sense of rotation of rocking arm.In the switching member of constructing like this, the displacement of second rocking arm is delivered to first rocking arm and has reduced the stress burden.The switching mechanism structure more complicated of this kind scheme, manufacture cost are also expensive.
Again for example patent " novel changable air valve lift range mechanism " (number of patent application: 02222780.6) disclosed: the novel changable air valve lift range mechanism comprises the camshaft of cylinder head, cam, drive cam rotation, by the valve tappet of cam driven with by the valve of tappet control.On camshaft, there are a High speed cam and symmetry to be positioned at two Lower speed cams on High speed cam both sides.Between the inner convex platform of the outer lug boss of little tappet and big tappet Returnning spring is installed, little tappet plunger is positioned at the hydraulic pressure cavity of big tappet, little tappet and High speed cam contact matching; Big tappet plunger is positioned at the tappet orbit of cylinder head, and big tappet two ends connect two valves respectively, big tappet and two Lower speed cam contact matching; Hydraulic pressure cavity is communicated with the relief chamber in the cylinder head through hydraulic oil channel, and solenoid valve is installed on the hydraulic oil channel.This kind scheme is used different cam drive valve tappets respectively at a high speed with low speed the time, change port timing and valve lift, and structure is very complicated, and manufacture cost is higher.
Summary of the invention
The objective of the invention is to propose a kind of I. C engine distribution mechanism and controlling method thereof of continuously variable valve lift simple in structure, with low cost, with output and the fuel consume situation of improving internal-combustion engine.
The I. C engine distribution mechanism of continuously variable valve lift of the present invention comprises the cam that driven by camshaft, by the rocking arm of cam driven, by the valve of rocking arm control and drive the valve spring of valve return; One end of said rocking arm and cam against and tangent; the other end of rocking arm and the top of valve flexible connection; key is that this gas distribution structure also is provided with and can drives the supporting portion that lower edge rocking arm length direction moves at control mechanism; the end face of said rocking arm is level and smooth plane or cambered surface, and the bottom of said supporting portion closely contacts with the rocking arm end face.
In above-mentioned distribution device; The supporting portion is equivalent to a fulcrum, and rocking arm just is equivalent to a lever under the effect of supporting portion, and the two ends of lever are respectively cam and valve; Principle according to lever; The lift of the end of lever is proportional with the distance of this end and fulcrum, that is to say: when support zone in rocking arm during near an end of valve, the valve lift that obtains during cam rotation is minimum; When support zone in rocking arm during near an end of cam, the valve lift that obtains during cam rotation is maximum.The end face of rocking arm is level and smooth plane or cambered surface, can be so that the mobile LINEAR CONTINUOUS of supporting portion, thus make the adjustment of valve lift also be LINEAR CONTINUOUS.
According to above-mentioned principle, the controlling method that draws distribution device of the present invention is following:
A: when needs reduce valve lift, utilize control mechanism to drive the supporting portion and move to the valve direction along the end face of rocking arm;
B: when needs increase valve lift, utilize control mechanism to drive the supporting portion and move to the cam direction along the end face of rocking arm.
Can there be various ways above-mentioned supporting portion; For example say: said rocking arm top is provided with a jack-post; Said jack-post is equipped with the roller of useing said supporting portion as, and said jack-post utilizes stepper motor and horizontal driving mechanism to drive, and does horizontal motion along the rocking arm length direction; The end face of said rocking arm is the plane, and said roller closely contacts with the end face of rocking arm.When roller during the rocking arm top mobile, will change the distance of roller apart from cam and valve in the drive lower edge of horizontal driving mechanism, thereby reach the purpose of adjustment valve lift.Above-mentioned horizontal driving mechanism can utilize two parallel leading screws that are fixed on the cylinder head to realize; The two ends of jack-post are separately fixed on the nut of two leading screws; The rotation of leading screw is converted into nut and moves along the straight line of leading screw direction, moves along the length direction of rocking arm thereby can drive jack-post and roller.
The controlling method of above-mentioned distribution device is following:
A: when needs reduced valve lift, the control step motor rotated, and moved to the valve direction through the end face of the roller on driving mechanism drive jack-post and the jack-post along rocking arm;
B: when needs increased valve lift, the control step motor rotated, and moved to the cam direction through the end face of the roller on driving mechanism drive jack-post and the jack-post along rocking arm.
Above-mentioned driving mechanism is comparatively complicated; In order to save cost; The special more simple supporting portion of a kind of form that proposes: said rocking arm top is provided with a rotating shaft that utilizes stepper motor to drive; Said rotating shaft is equipped with a roller of useing said supporting portion as through rolling wheel support, the cambered surface of the end face of rocking arm for conforming to the movement locus of said roller, and said roller closely contacts with cambered surface.When rotating shaft is rotated, will drive roller and move, thereby change the distance of roller apart from cam and valve along the cambered surface at rocking arm top, reach the purpose of adjustment valve lift.
The controlling method of above-mentioned distribution device is following:
A: when needs reduced valve lift, the control step motor rotated, and moved to the valve direction through the end face of rotating shaft drive roller along rocking arm;
B: when needs increased valve lift, the control step motor rotated, and moved to the cam direction through the end face of rotating shaft drive roller along rocking arm.
In order to prevent that rocking arm and valve break away from, rocking arm is connected through the ball auxiliary connection with valve: the end that said rocking arm is connected with valve is provided with a ball recess, and the bottom of groove is equipped with card; The top of said valve is spherical joint, and the bottom of said spherical joint is provided with annular slot, and the spherical joint of said valve stretches in the ball recess of rocking arm, and said card snaps in the annular slot of spherical joint.
The end face both sides of said rocking arm preferably also are provided with the rib that prevents that roller from deviating from.
Distribution device of the present invention can drive the supporting portion that lower edge rocking arm length direction moves at control mechanism through being provided with; Can continuously change the distance of valve and cam and supporting portion; Thereby can continuously change the lift of valve, realize improving the output of internal-combustion engine and the purpose of fuel consume situation.
Description of drawings
Fig. 1 is that embodiment 1 distribution device is in valve lift phase diagram hour;
Fig. 2 is embodiment 1 the phase diagram of distribution device when valve lift is big;
Fig. 3 is minimum and the valve lift diagram of maximum two states of embodiment 1 distribution device;
Fig. 4 is the structural representation of rocking arm of embodiment 1 distribution device;
Fig. 5 is the structural representation of valve of embodiment 1 distribution device;
Fig. 6 is rocking arm and the linkage structure schematic representation of valve of embodiment 1 distribution device.
Embodiment
Specify the present invention below in conjunction with specific embodiment and accompanying drawing.
Embodiment 1:
Like Fig. 1, shown in 2; The rocking arm 2 that the I. C engine distribution mechanism of the continuously variable valve lift of present embodiment comprises the cam 1 that driven by camshaft, driven by cam 1, by the valve 3 of rocking arm 2 controls and drive the valve spring 4 of valve 3 returns; One end of said rocking arm 2 and cam 1 are tangent against also; the top of the other end of rocking arm 2 and valve 3 flexibly connects, and rocking arm 2 tops are provided with a rotating shaft 5 that utilizes stepper motor to drive, and said rotating shaft 5 is equipped with a roller 7 through rolling wheel support 6; cambered surface 8 of the end face of rocking arm 2 for conforming to the movement locus of roller 7, said cambered surface 8 closely contacts with roller 7.Rotating shaft 5 can be fixed on the top of cylinder head through a support.(camshaft and stepper motor do not draw in the accompanying drawings)
The cambered surface 8 of the end face of rocking arm 2 conforms to the movement locus of roller 7; Be that cambered surface 8 is concentric with rotating shaft 5; Can guarantee rotating shaft 5 valve 3 residing basic circle invariant positions in rotating process like this, therefore can realize the different opening of valve 3 under the different amount through the rotation of countershaft 5.
The controlling method of the distribution device of present embodiment is following:
A: as shown in Figure 1, when needs reduced valve lift, the control step motor rotated, and moved to valve 3 directions through the end face 8 of rotating shaft 5 drive rollers 7 along rocking arm;
B: as shown in Figure 2, when needs increased valve lift, the control step motor rotated, and moved to cam 1 direction through the end face 8 of rotating shaft 5 drive rollers 7 along rocking arm.
As shown in Figure 3, be respectively minimum and the valve lift diagram of maximum two states of the distribution device of present embodiment.The scope of minimum valve lift is 0～1mm; The scope of maximum valve lift is 0～10mm; According to the difference of size between mechanism's component and position relation, the lift scope also can change, because the cam in the present embodiment is the non-regular cam of simplifying; So the lifting curve gradient that obtains is bigger, can be according to the shape of optimizing cam so that this curve be optimized again.
Like Fig. 4,5, shown in 6, break away from order to prevent rocking arm 2 and valve 3, rocking arm 2 is connected through the ball auxiliary connection with valve 3: the end that said rocking arm 2 is connected with valve 3 is provided with a ball recess 21, and the bottom of groove 21 is equipped with card 22; The top of said valve 3 is spherical joint 31, and the bottom of said spherical joint 31 is provided with annular slot 32, and when connecting, the spherical joint 31 of valve stretches in the ball recess 21 of rocking arm, and card 22 snaps in the annular slot 32 of spherical joint.
Claims (4)
1. the I. C engine distribution mechanism of a continuously variable valve lift; Comprise the cam that drives by camshaft, by the rocking arm of cam driven, by the valve of rocking arm control and drive the valve spring of valve return; One end of said rocking arm and cam are tangent against also; the other end of rocking arm and the top of valve flexibly connect, and it is characterized in that said rocking arm top is provided with a rotating shaft that utilizes stepper motor to drive, and said rotating shaft is equipped with a roller through rolling wheel support; the cambered surface of the end face of rocking arm for conforming to the movement locus of said roller, said roller closely contacts with cambered surface.
2. the I. C engine distribution mechanism of continuously variable valve lift according to claim 1 is characterized in that the end that said rocking arm is connected with valve is provided with a ball recess, and the bottom of groove is equipped with card; The top of said valve is spherical joint, and the bottom of said spherical joint is provided with annular slot, and the spherical joint of said valve stretches in the ball recess of rocking arm, and said card snaps in the annular slot of spherical joint.
3. the I. C engine distribution mechanism of continuously variable valve lift according to claim 1 and 2 is characterized in that the end face both sides of said rocking arm are provided with the rib that prevents that roller from deviating from.
4. the controlling method of the I. C engine distribution mechanism of continuously variable valve lift according to claim 1 is characterized in that comprising the steps:
A: when needs reduced valve lift, the control step motor rotated, and moved to the valve direction through the end face of rotating shaft drive roller along rocking arm;
B: when needs increased valve lift, the control step motor rotated, and moved to the cam direction through the end face of rotating shaft drive roller along rocking arm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102324331A CN101900003B (en) | 2010-07-20 | 2010-07-20 | Internal combustion engine distribution mechanism with continuously variable valve stroke and control method thereof |
| PCT/CN2011/077326 WO2012010081A1 (en) | 2010-07-20 | 2011-07-19 | Air distributing mechanism for internal combustion engine with continuously variable valve lift and control method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102324331A CN101900003B (en) | 2010-07-20 | 2010-07-20 | Internal combustion engine distribution mechanism with continuously variable valve stroke and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101900003A CN101900003A (en) | 2010-12-01 |
| CN101900003B true CN101900003B (en) | 2012-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102324331A Active CN101900003B (en) | 2010-07-20 | 2010-07-20 | Internal combustion engine distribution mechanism with continuously variable valve stroke and control method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101900003B (en) |
| WO (1) | WO2012010081A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900003B (en) * | 2010-07-20 | 2012-06-27 | 奇瑞汽车股份有限公司 | Internal combustion engine distribution mechanism with continuously variable valve stroke and control method thereof |
| CN102507162A (en) * | 2011-10-08 | 2012-06-20 | 东风汽车零部件(集团)有限公司 | Reliability test device for single-station engine rocker arm assembly |
| CN102383887B (en) * | 2011-10-26 | 2016-08-17 | 奇瑞汽车股份有限公司 | A kind of valve control machanism of overhead camshaft engine |
| CN103075223B (en) * | 2012-12-24 | 2015-08-19 | 绵阳新晨动力机械有限公司 | Petrol engine Lever type continuous variable valve lift mechanism |
| AT514535B1 (en) | 2013-06-18 | 2017-05-15 | Avl List Gmbh | Valve actuator |
| CN106555681B (en) * | 2015-09-28 | 2019-11-01 | 长城汽车股份有限公司 | Control method, system and the vehicle of continuous variable valve lift system |
| CN108798822B (en) * | 2018-06-25 | 2023-04-18 | 常州机电职业技术学院 | Continuous variable valve lift device of piston type internal combustion engine |
| CN109026256B (en) * | 2018-08-10 | 2024-03-08 | 绵阳新晨动力机械有限公司 | Variable valve lift control system |
| AT16892U1 (en) * | 2018-09-03 | 2020-11-15 | Avl List Gmbh | VARIABLE VALVE DRIVE DEVICE |
| CN112814757A (en) * | 2019-11-15 | 2021-05-18 | 舍弗勒技术股份两合公司 | Valve rocker arm assembly |
| CN114295380B (en) * | 2021-12-13 | 2024-04-19 | 贵阳学院 | Engine valve mechanism test device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4526142A (en) * | 1981-06-24 | 1985-07-02 | Nissan Motor Company, Limited | Variable valve timing arrangement for an internal combustion engine or the like |
| US4638773A (en) * | 1986-02-28 | 1987-01-27 | General Motors Corporation | Variable valve lift/timing mechanism |
| US4986227A (en) * | 1990-05-08 | 1991-01-22 | Dewey Iii Albert B | Variable lift valve train |
| US5572962A (en) * | 1991-12-03 | 1996-11-12 | Motive Holdings Limited | Variable valve lift mechanism for internal combustion engine |
| JPH1018824A (en) * | 1996-07-05 | 1998-01-20 | Yamaha Motor Co Ltd | Variable valve train for engine |
| FR2787136A1 (en) * | 1998-12-11 | 2000-06-16 | Joel Bourdeau | I.c. engine distribution valve regulator has variable-position thrust member interacting with outer end of valve rocker lever |
| JP4063623B2 (en) * | 2002-09-19 | 2008-03-19 | 株式会社オティックス | Variable valve mechanism |
| JP4891793B2 (en) * | 2007-01-29 | 2012-03-07 | 株式会社オティックス | Variable valve mechanism |
| KR20090114217A (en) * | 2008-04-29 | 2009-11-03 | 현대자동차주식회사 | Variable valve lift apparatus |
| CN101900003B (en) * | 2010-07-20 | 2012-06-27 | 奇瑞汽车股份有限公司 | Internal combustion engine distribution mechanism with continuously variable valve stroke and control method thereof |
-
2010
- 2010-07-20 CN CN2010102324331A patent/CN101900003B/en active Active
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2011
- 2011-07-19 WO PCT/CN2011/077326 patent/WO2012010081A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN101900003A (en) | 2010-12-01 |
| WO2012010081A1 (en) | 2012-01-26 |
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