CN102852584A - Continuously variable valve lift system - Google Patents
Continuously variable valve lift system Download PDFInfo
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- CN102852584A CN102852584A CN2012103623857A CN201210362385A CN102852584A CN 102852584 A CN102852584 A CN 102852584A CN 2012103623857 A CN2012103623857 A CN 2012103623857A CN 201210362385 A CN201210362385 A CN 201210362385A CN 102852584 A CN102852584 A CN 102852584A
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- rocking arm
- arm
- valve lift
- eccentric wheel
- lift system
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Abstract
The invention discloses a continuously variable valve lift system, which relates to the field of engine valve design; the continuously variable valve lift system comprises a first rocker arm; the bottom side of a first end of the first rocker arm is in contact with a valve and can push the valve; the bottom side of a second end of the first rocker arm is supported by a hydraulic tappet; the continuously variable valve lift system further comprises a second rocker arm which is used for pushing the first rocker arm and driven by a fixedly arranged driving cam; the second rocker arm is arranged on an eccentric wheel and uses the center of the eccentric wheel as rotation center; the position of the rotation center of the second rocker arm is changed; correspondingly, directions and sizes of a power arm and a resisting arm as well as an angle between the second rocker arm and a horizontal plane are changed; and then the rotation quantity of the first rocker arm is driven to be changed; and finally, the lift of the valve in contact with the first rocker arm is changed; and according to the invention, problems of incomplete performance, complicated structure and expensive manufacturing cost of a lifting engine of the traditional valve lift system are solved.
Description
Technical field
The present invention relates to the engine valve design field, particularly relate to a kind of continuous variable valve lift system.
Background technique
For traditional petrol engine, valve lift amount is changeless, and the adjusting of engine load realizes by the control throttle opening.Such method of controlling is so that motor exists larger pumping loss, and particularly under sub load, pumping loss is even more serious, can affect significantly the performance of motor.
Therefore, international each large automobile group all drops into a large amount of funds and manpower research and development variable valve lift technology.At present, the continuously variable valve lift technology can change valve lift amount according to the operating conditions of motor, so that closure is in the scope of larger opening all the time, can effectively reduce the characteristics of oil consumption and discharging, raising engine power and moment of torsion.Yet just at present in the product of listing, a class is that valve lift can realize the adjustable of two-stage to three grade, and deficiency is partly to promote the performance of motor; The another kind of continuous variable that can realize valve lift, but mechanism complicated, involve great expense.
Summary of the invention
The purpose of this invention is to provide a kind of novel continuous variable valve lift system, solved that present valve lift system promotes engine performance not exclusively and complex structure, the problem that involves great expense.
In order to realize the foregoing invention purpose, the invention provides a kind of continuous variable valve lift system, comprising:
The first rocking arm, its first end bottom side contact with valve and can promote valve, and the second bottom side is supported by hydraulic tappet;
Driving cam is fixed on the camshaft;
The second rocking arm, described driving cam contacts and promotes the first end of described the second rocking arm, and the second end in contact of described the second rocking arm also promotes described the first rocking arm;
Described the second rocking arm is arranged on the eccentric wheel, take eccentric center as rotating center;
Described eccentric wheel rotation, described eccentric central position changes, and changes accordingly power arm and the resistance arm of described the second rocking arm, the lift of final change and the contacted valve of the first rocking arm.
Alternatively, in the above-mentioned device, the position of the rotating center of described the second rocking arm changes, and the angle of the direction of described power arm and resistance arm and size, described the second rocking arm and horizontal plane changes accordingly, the amounts of rotation that drives again described the first rocking arm changes, and finally changes the lift of valve.
Alternatively, in the above-mentioned device, with intended distance and the described camshaft live axle that has been arranged in parallel, described eccentric wheel is fixed on the described live axle.
Alternatively, in the above-mentioned device, described eccentric slewing area is 0 °-90 °.
Alternatively, in the above-mentioned device, when described eccentric when being centered close to described live axle axle center vertical lower, be defined as original state, at this moment, described power arm is maximum, resistance arm is minimum, and valve lift amount is minimum.
When described eccentric center forwarded 90 ° to counterclockwise by original state, the rotating center of described the second rocking arm rose to the peak of its working state, and at this moment, described power arm is minimum, resistance arm is maximum, and valve lift amount is maximum.
Alternatively, in the above-mentioned device, between first end and the second end, be provided with roller bearing on described the first rocking arm, be used for and described the second rocking arm sliding contact.
Alternatively, in the above-mentioned device, the second end of described the second rocking arm and described roller bearing contacting point are the arc that concaves.
Alternatively, in the above-mentioned device, the first end of described the second rocking arm and described driving cam contacting point are the arc that concaves.
Alternatively, in the above-mentioned device, the rotating center of described the second rocking arm is power arm to the perpendicular distance of its driving force line of action, and described driving force is provided by driving cam;
The rotating center of described the second rocking arm is resistance arm to the perpendicular distance of its drag effect line, and described resistance promotes the first rocking arm by the rotation of the second rocking arm and produces.
There is following technique effect at least in the present invention:
1), the present invention utilizes eccentric rotation to change the position of the second rocking arm rotating center, thereby so that the power arm L1 of the second rocking arm and resistance arm L2 direction and size change, the lift amount of final change and the contacted valve of the first rocking arm, structural principle is simple, controls convenient and swift;
2), angle of the every rotation of eccentric wheel among the present invention, all will change the position of the second rocking arm rotating center, thereby change valve lift amount, namely belong to stepless regulated, so that engine performance obtains higher lifting;
3), eccentric rotational angle range is 0 °-90 ° among the present invention, can realize that just valve lift amount is by being minimal to maximum variation, so that native system regulation and control efficient is higher; And corresponding eccentric wheel rotates operating element and also can be simplified, and is easy to make and install, and has also promoted simultaneously the reliability of system;
4), the present invention's the first rocking arm is provided with roller bearing so that and the friction between the second rocking arm less, control efficient higher; Contacting point with the first rocking arm and driving cam on the second rocking arm all is designed to the indent arc, plays and offsets or compensate because the effect of the displacement increase and decrease that the rotation of the second rocking arm brings.
Description of drawings
Fig. 1 is perspective view of the present invention;
Fig. 2 is plan view of the present invention;
Fig. 3 is the position relationship schematic diagram of each member when the valve lift amount difference is minimum and maximum among the present invention;
Fig. 4 be among the present invention eccentric wheel rotate front and back position relation, eccentric wheel center movement direction and thereupon the front and back position of the second rocking arm of motion concern schematic diagram;
Fig. 5 is the valve lift amount schematic diagram of hour power arm and resistance arm among the present invention;
Fig. 6 is the schematic diagram of power arm and resistance arm when valve lift amount is maximum among the present invention;
Wherein,
1-the second rocking arm, 2-eccentric wheel, 3-hydraulic tappet, 4-driving cam, 5-the first rocking arm, 6-valve, 7-live axle, 8-camshaft, 9-roller bearing.
Embodiment
For the purpose, technological scheme and the advantage that make the embodiment of the invention is clearer, below in conjunction with accompanying drawing specific embodiment is described in detail.
Shown in Fig. 1-6, the embodiment of the invention provides a kind of continuous variable valve lift system, comprising:
The first Rocker arm 5, its first end bottom side contact with valve 6 and can promote valve 6, the second bottom sides and supported by hydraulic tappet 3, and namely the first Rocker arm 5 can rotate around hydraulic tappet 3.
The second rocking arm 1, described driving cam 4 contacts and promotes the first end of described the second rocking arm 1, and the second end in contact of described the second rocking arm 1 also promotes described the first Rocker arm 5, and namely the Driving force of valve 6 is provided by the second rocking arm 1.
Described the second rocking arm 1 is arranged on the eccentric wheel 2, take the center of eccentric wheel 2 as rotating center.
During described eccentric wheel 2 rotation, the central position of described eccentric wheel 2 will change, so that the rotating center position of the second rocking arm 1 changes thereupon, power arm L1 and the resistance arm L2 of the second rocking arm 1 as shown in Figures 4 and 5 also will correspondingly change, the lift of final change and the contacted valve 6 of the first Rocker arm 5, be valve lift amount, structural principle is simple, controls convenient and swift.
In one embodiment of the present of invention, can be with intended distance at location arrangements live axle 7 parallel with described camshaft 8, described eccentric wheel 2 is fixed on the described live axle 7.Shown in a part of Fig. 4, by the variation of solid line among the figure to dotted line in eccentric wheel 2 rotation processes, the variation track at the center of eccentric wheel 2 is circular arc, and its rotational angle range is 0 °-90 °, and valve lift amount also realizes the variation by min-max as shown in Figure 3 simultaneously.
Such as the solid line among Fig. 3 part and shown in Figure 5, when the described live axle 7 axle center vertical lower of being centered close to of described eccentric wheel 2, namely during the A point position in the b of Fig. 4 part, be defined as original state.At this moment, described power arm L1 is maximum, resistance arm L2 is minimum, and valve lift amount is minimum.
When the center of described eccentric wheel 2 is rotated counterclockwise rising by original state gradually to driving cam 4 place directions, the rotating center of described the second rocking arm 1 will rotate thereupon and raise along the track of circular arc, motion track is shown in the direction of arrow in the b part of Fig. 4, so that no matter the second rocking arm 1 is that level and vertical direction all have movement.Because driving cam 4 is fixed, and the first Rocker arm 5 can rotate around hydraulic tappet 3, and by Fig. 4 and Fig. 5 and mechanics general knowledge as can be known, above-mentioned movement will cause the second rocking arm 1 and the angle of horizontal plane to change, power arm L1 direction will change this moment, and power arm L1 will diminish gradually; In addition, the second end of the second rocking arm 1 will promote the first Rocker arm 5 and clockwise rotate several angle, the direction of resistance arm L2 will change this moment, it is large that resistance arm L2 will become gradually, correspondingly the amounts of rotation of the first Rocker arm 5 also becomes greatly, finally also becomes gradually large so that be arranged on the lift amount of the valve 6 of the first Rocker arm 5 first end bottom.Such as the dotted portion among Fig. 3 and shown in Figure 6, when the angle of swing of described eccentric wheel 2 was 90 °, the rotating center of described the second rocking arm 1 rose to the peak of its working state, it is the B point position in the b part of Fig. 4, at this moment, described power arm is minimum, resistance arm is maximum, and valve lift is maximum.Accordingly, if will make valve lift amount little by changing to greatly, described eccentric wheel 2 is turned clockwise get final product, principle is identical, and detailed process is opposite with said process, repeats no more herein.
Angle of eccentric wheel 2 every rotations among the present invention all will change the position of the second rocking arm 1 rotating center, thereby change valve lift amount, and namely native system belongs to stepless regulated, so that engine performance obtains higher lifting.In addition, the rotational angle range of eccentric wheel 2 is 0 °-90 °, can realize that just valve lift amount is by being minimal to maximum variation, so that native system regulation and control efficient is higher; And corresponding eccentric wheel 2 rotates operating element and also can be simplified, and is easy to make and install, and has also promoted simultaneously the reliability of system.
In one embodiment of the present of invention, between first end and the second end, can be provided with roller bearing 9 on described the first Rocker arm 5, be used for and 1 sliding contact of described the second rocking arm so that and the friction between the second rocking arm less, control efficient higher.
The first end of the second end of described the second rocking arm 1 and described roller bearing 9 contacting points and described the second rocking arm 1 and described driving cam 4 contacting points all are the arc that concaves, and play and offset or compensate because the effect of the displacement increase and decrease that the rotation of the second rocking arm brings.
In one embodiment of the present of invention, the rotating center of described the second rocking arm 1 is power arm L1 to the perpendicular distance of its driving force line of action, and described driving force is provided by driving cam 4.
The rotating center of described the second rocking arm 1 is resistance arm L2 to the perpendicular distance of its drag effect line, and described resistance promotes the first Rocker arm 5 by 1 rotation of the second rocking arm and produces.
The invention enables valve lift amount as follows to maximum whole working procedure by minimum:
At first, during normal working of engine, live axle 8 drives driving cam 4 rotations, driving cam 4 drives the first end of the second rocking arm 1, the second rocking arm 1 is swung around eccentric wheel 2, the second end of the second rocking arm 1 drives the first Rocker arm 5 again and swings around hydraulic tappet 3, thereby controls the lifting of valve 6 of the first end bottom of the first Rocker arm 5.
When stepless regulated, corresponding drive unit drives eccentric wheel 2 to be begun to rotate counterclockwise by original state, angle of every rotation, and the central position of eccentric wheel 2 all will raise along the track of circular arc.At this moment, the second rocking arm 1 take eccentric wheel 2 centers as rotating center also increases, and the second rocking arm 1 all is subjected to displacement in level and vertical direction, and fixing driving cam 4 is so that the angle change of the second rocking arm 1 and horizontal plane, therefore power arm L1 direction changes, and power arm L1 reduces gradually.Correspondingly, in the rotating center elevation process of the second rocking arm 1, the second end of the second rocking arm 1 will promote the first Rocker arm 5 and clockwise rotate several angle, and the direction of resistance arm L2 will change this moment, resistance arm L2 will become greatly gradually, so that the rotation quantitative change of the first Rocker arm 5 is large.Finally also become gradually large so that be arranged on the lift amount of the valve 6 of the first Rocker arm 5 first end bottom, thereby reach the purpose of stepless regulated valve lift amount, improve the motor car engine performance.At last, if valve lift amount will then get final product above-mentioned working procedure conversely by being up to minimum, repeat no more herein.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a continuous variable valve lift system is characterized in that, comprising:
The first rocking arm (5), its first end bottom side contact with valve (6) and can promote valve (6), and the second bottom side is supported by hydraulic tappet (3);
Driving cam (4) is fixed on the camshaft (8);
The second rocking arm (1), described driving cam (4) contacts and promotes the first end of described the second rocking arm (1), and the second end in contact of described the second rocking arm (1) also promotes described the first rocking arm (5);
Described the second rocking arm (1) is arranged on the eccentric wheel (2), take the center of eccentric wheel (2) as rotating center;
Described eccentric wheel (2) rotation, the central position of described eccentric wheel (2) changes, and changes accordingly power arm and the resistance arm of described the second rocking arm (1), the lift of final change and the contacted valve of the first rocking arm (5) (6).
2. continuous variable valve lift system according to claim 1, it is characterized in that, the position of the rotating center of described the second rocking arm (1) changes, the direction of described power arm and resistance arm and size, described the second rocking arm (1) change with the angle of horizontal plane accordingly, the amounts of rotation that drives again described the first rocking arm (5) changes, and finally changes the lift of valve (6).
3. continuous variable valve lift system according to claim 1 is characterized in that, with intended distance and described camshaft (8) live axle (7) that has been arranged in parallel, described eccentric wheel (2) is fixed on the described live axle (7).
4. continuous variable valve lift system according to claim 3 is characterized in that, the slewing area of described eccentric wheel (2) is 0 °-90 °.
5. continuous variable valve lift system according to claim 4 is characterized in that,
When described eccentric wheel (2) be centered close to described live axle (7) axle center vertical lower the time, be defined as original state, at this moment, described power arm is maximum, resistance arm is minimum, valve lift amount is minimum.
When the center of described eccentric wheel (2) forwarded 90 ° to counterclockwise by original state, the rotating center of described the second rocking arm (1) rose to the peak of its working state, and at this moment, described power arm is minimum, resistance arm is maximum, and valve lift amount is maximum.
6. continuous variable valve lift system according to claim 1 is characterized in that, the upper roller bearing (9) that is provided with between first end and the second end of described the first rocking arm (5) is used for and described the second rocking arm (1) sliding contact.
7. continuous variable valve lift system according to claim 6 is characterized in that, the second end of described the second rocking arm (1) and described roller bearing (9) contacting point are the arc that concaves.
8. continuous variable valve lift system according to claim 1 is characterized in that, the first end of described the second rocking arm (1) and described driving cam (4) contacting point are the arc that concaves.
9. continuous variable valve lift system according to claim 1 is characterized in that,
The rotating center of described the second rocking arm (1) is power arm to the perpendicular distance of its driving force line of action, and described driving force is provided by driving cam (4);
The rotating center of described the second rocking arm (1) is resistance arm to the perpendicular distance of its drag effect line, and described resistance promotes the first rocking arm (5) by the second rocking arm (1) rotation and produces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210362385.7A CN102852584B (en) | 2012-09-25 | 2012-09-25 | A kind of continuous variable valve lift system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210362385.7A CN102852584B (en) | 2012-09-25 | 2012-09-25 | A kind of continuous variable valve lift system |
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| Publication Number | Publication Date |
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| CN102852584A true CN102852584A (en) | 2013-01-02 |
| CN102852584B CN102852584B (en) | 2016-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210362385.7A Active CN102852584B (en) | 2012-09-25 | 2012-09-25 | A kind of continuous variable valve lift system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103321708A (en) * | 2013-06-06 | 2013-09-25 | 浙江吉利汽车研究院有限公司杭州分公司 | Stepless variable-valve-lift mechanism |
| CN103437850A (en) * | 2013-08-14 | 2013-12-11 | 重庆长安汽车股份有限公司 | Continuously variable valve lift mechanism |
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| CN101457665A (en) * | 2007-12-14 | 2009-06-17 | 现代自动车株式会社 | Continuous variable valve lift system |
| US20100139588A1 (en) * | 2008-12-04 | 2010-06-10 | Hyundai Motor Company | Continuously Variable Valve Lift Apparatus |
| WO2010108374A1 (en) * | 2009-03-27 | 2010-09-30 | 奇瑞汽车股份有限公司 | Engine distribution mechanism with adjustable lift air valve |
| CN102155273A (en) * | 2011-04-08 | 2011-08-17 | 奇瑞汽车股份有限公司 | Variable gas distribution mechanism of engine |
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2012
- 2012-09-25 CN CN201210362385.7A patent/CN102852584B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101457665A (en) * | 2007-12-14 | 2009-06-17 | 现代自动车株式会社 | Continuous variable valve lift system |
| US20090151665A1 (en) * | 2007-12-14 | 2009-06-18 | Hyundai Motor Company | Continuous variable valve lift system |
| US20100139588A1 (en) * | 2008-12-04 | 2010-06-10 | Hyundai Motor Company | Continuously Variable Valve Lift Apparatus |
| WO2010108374A1 (en) * | 2009-03-27 | 2010-09-30 | 奇瑞汽车股份有限公司 | Engine distribution mechanism with adjustable lift air valve |
| CN102155273A (en) * | 2011-04-08 | 2011-08-17 | 奇瑞汽车股份有限公司 | Variable gas distribution mechanism of engine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103321708A (en) * | 2013-06-06 | 2013-09-25 | 浙江吉利汽车研究院有限公司杭州分公司 | Stepless variable-valve-lift mechanism |
| CN103321708B (en) * | 2013-06-06 | 2016-06-15 | 浙江吉利汽车研究院有限公司杭州分公司 | Stepless variable valve lift mechanism |
| CN103437850A (en) * | 2013-08-14 | 2013-12-11 | 重庆长安汽车股份有限公司 | Continuously variable valve lift mechanism |
| CN103437850B (en) * | 2013-08-14 | 2015-06-03 | 重庆长安汽车股份有限公司 | Continuously variable valve lift mechanism |
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| CN102852584B (en) | 2016-09-21 |
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