CN102852584B - A kind of continuous variable valve lift system - Google Patents
A kind of continuous variable valve lift system Download PDFInfo
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- CN102852584B CN102852584B CN201210362385.7A CN201210362385A CN102852584B CN 102852584 B CN102852584 B CN 102852584B CN 201210362385 A CN201210362385 A CN 201210362385A CN 102852584 B CN102852584 B CN 102852584B
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- rocking arm
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Abstract
The invention discloses a kind of continuous variable valve lift system, relate to engine valve design field, including the first rocking arm, its side, the first bottom and valve contacts also can promote valve, and the second side, bottom is supported by hydraulic tappet；Also include for promote the first rocking arm and be fixedly installed drive the second rocking arm of being driven of cam, described second rocking arm is arranged on eccentric, with the center of eccentric as center of rotation；The position change of the center of rotation of described second rocking arm, the most described power arm and the direction of resistance arm and size, described second rocking arm change with the angle of horizontal plane, the amount of spin driving described first rocking arm again changes, and finally changes the lift of the valve contacted with the first rocking arm；The present invention solves current valve lift system and promotes the problem that engine performance is incomplete and structure is complicated, involve great expense.
Description
Technical field
The present invention relates to engine valve design field, particularly relate to a kind of continuous variable valve
Actuating system.
Background technology
For traditional petrol engine, valve lift amount is changeless, engine load
Regulation by control throttle opening realize.Such method of controlling makes electromotor exist
Bigger pumping loss, the most at part load, pumping loss is even more serious, can very great Cheng
The performance affecting electromotor of degree.
Therefore, international Ge great automobile group all puts into substantial amounts of fund and manpower research and development variable valve lift
Technology.At present, continuously variable valve lift technology, gas can be changed according to the operating condition of electromotor
Door lift amount so that air throttle is in the range of larger opening all the time, can effectively reduce oil consumption and
Discharge, raising engine power and the feature of moment of torsion.But in the product of listing the most at present, a class is
Valve stroke can realize the adjustable of two-stage to three grades, is disadvantageous in that and can only partly promote electromotor
Performance；The another kind of continuous variable that can realize valve stroke, but mechanism is complicated, involve great expense.
Summary of the invention
It is an object of the invention to provide a kind of novel continuous variable valve lift system, solve
At present valve lift system promote that engine performance is incomplete and structure is complicated, asking of involving great expense
Topic.
In order to realize foregoing invention purpose, the invention provides a kind of continuously variable valve lift system
System, including:
First rocking arm, its side, the first bottom and valve contacts also can promote valve, and the second side, bottom is by liquid
Pressure tappet supports；
Drive cam, be fixed on camshaft；
Second rocking arm, described driving cam contact also promotes the first end of described second rocking arm, and described
Second end in contact of two rocking arms also promotes described first rocking arm；
Described second rocking arm is arranged on eccentric, with the center of eccentric as center of rotation；
Described eccentric rotates, and the center of described eccentric changes, and changes described accordingly
The power arm of the second rocking arm and resistance arm, finally change the lift of the valve contacted with the first rocking arm.
Alternatively, in above-mentioned device, the position change of the center of rotation of described second rocking arm, right
Answer described power arm and the direction of resistance arm and size, the angle of described second rocking arm and horizontal plane is sent out
Raw change, then drive the amount of spin of described first rocking arm to change, the final lift changing valve.
Alternatively, in above-mentioned device, it is arranged in parallel driving with preset distance and described camshaft
Axle, described eccentric is fixed in described drive shaft.
Alternatively, in above-mentioned device, the slewing area of described eccentric is 0 °-90 °.
Alternatively, in above-mentioned device, when described eccentric is centrally located at described drive shaft axle center
During vertical lower, being defined as original state, now, described power arm is maximum, resistance arm is minimum, gas
Door lift amount is minimum.
When the center of described eccentric is forwarded to 90 ° counterclockwise by original state, described second rocking arm
Center of rotation rises to the peak of its duty, and now, described power arm is minimum, resistance arm is maximum,
Valve lift amount is maximum.
Alternatively, in above-mentioned device, on described first rocking arm between the first end and the second end
It is provided with roller bearing, is used for and described second rocking arm sliding contact.
Alternatively, in above-mentioned device, the second end of described second rocking arm and described roller bearing
Contact position is in the arc concaved.
Alternatively, in above-mentioned device, the first end of described second rocking arm and described driving cam
Contact position is in the arc concaved.
Alternatively, in above-mentioned device, the center of rotation of described second rocking arm is to its driving force effect
The vertical dimension of line is power arm, and described driving force provides by driving cam；
The center of rotation of described second rocking arm is resistance arm to the vertical dimension of its drag effect line, described
Resistance is produced by second rocking arm rotation forces the first rocking arm.
At least there is techniques below effect in the present invention:
1), the present invention be utilize eccentric rotate change the second rocking arm center of rotation position,
So that the power arm L1 of the second rocking arm and resistance arm L2 direction and size change, finally
Changing the lift amount of the valve contacted with the first rocking arm, structural principle is simple, manipulates convenient and swift；
2), eccentric often rotates an angle in the present invention, all will change during the second rocking arm rotates
The position of the heart, thus change valve lift amount, i.e. belong to stepless regulated so that engine performance obtains
To higher lifting；
3), the rotational angle range of eccentric is 0 °-90 ° in the present invention, just can realize gas
Door lift amount is by the change being minimal to maximum so that native system regulation and control are in hgher efficiency；And it is corresponding
Eccentric rotates operating element and also can be simplified, it is easy to manufactures and installs, the most also improves
The reliability of system；
4), the present invention the first rocking arm is provided with roller bearing so that and the friction between the second rocking arm
Less, manipulate in hgher efficiency；On second rocking arm, the contact position with the first rocking arm and driving cam is all designed
For indent arc, play and counteract or compensate for owing to the second rocking arm rotates the effect of the displacement increase and decrease brought.
Accompanying drawing explanation
Fig. 1 is the perspective view of the present invention；
Fig. 2 is the front view of the present invention；
When Fig. 3 is valve lift amount minimum and maximum respectively in the present invention, the position of each component is closed
It it is schematic diagram；
Fig. 4 is that in the present invention, eccentric rotates front and back position relation, eccentric center moving direction
And position relationship schematic diagram before and after the second rocking arm moved therewith；
Power arm and the schematic diagram of resistance arm when Fig. 5 is valve lift amount minimum in the present invention；
Power arm and the schematic diagram of resistance arm when Fig. 6 is valve lift amount maximum in the present invention；
Wherein,
1-the second rocking arm, 2-eccentric, 3-hydraulic tappet, 4-drives cam, 5-the first rocking arm,
6-valve, 7-drive shaft, 8-camshaft, 9-roller bearing.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below will knot
Close accompanying drawing specific embodiment is described in detail.
Shown in Fig. 1-6, embodiments provide a kind of continuous variable valve lift system,
Including:
First Rocker arm 5, its side, the first bottom contacts and can promote valve 6, the second bottom with valve 6
Side is supported by hydraulic tappet 3, and the i.e. first Rocker arm 5 can rotate around hydraulic tappet 3.
Drive cam 4, be fixed on camshaft 8.
Second rocking arm 1, described driving cam 4 contacts and promotes the first end of described second rocking arm 1, institute
State the second end in contact of the second rocking arm 1 and promote described first Rocker arm 5, the i.e. motive force of valve 6 by
Two rocking arms 1 provide.
Described second rocking arm 1 is arranged on eccentric 2, with the center of eccentric 2 as center of rotation.
When described eccentric 2 rotates, the center of described eccentric 2 will change so that second shakes
The center of rotation position of arm 1 changes therewith, the power arm of the second rocking arm 1 as shown in Figures 4 and 5
L1 and resistance arm L2 also will correspondingly change, and finally change the valve contacted with the first Rocker arm 5
The lift of 6, i.e. valve lift amount, structural principle is simple, manipulates convenient and swift.
In one embodiment of the present of invention, can be with preset distance parallel with described camshaft 8
Piece drive shaft 7 of location arrangements, described eccentric 2 is fixed in described drive shaft 7.A portion such as Fig. 4
Shown in point, eccentric 2 rotation process is by the change of solid line in figure to dotted line, the center of eccentric 2
Variation track be circular arc, its rotational angle range is 0 °-90 °, and valve lift amount is also real simultaneously
Now as shown in Figure 3 by the change of min-max.
As shown in the bold portion in Fig. 3 and Fig. 5, be centrally located at when described eccentric 2 described in drive
Below moving axis 7 axis perpendicular, i.e., during A point position in the b part of Fig. 4, it is defined as original state.This
Time, described power arm L1 is maximum, resistance arm L2 is minimum, and valve lift amount is minimum.
When the center of described eccentric 2 is the most counterclockwise to driving direction, cam 4 place by original state
Rotating when raising, the center of rotation of described second rocking arm 1 will rotate with and along the track of circular arc
Raising, motion track is as shown in the direction of arrow in the b part of Fig. 4 so that the second rocking arm 1 either water
Gentle vertical direction all has movement.Because it is fixing for driving cam 4, and the first Rocker arm 5 can be around hydraulic pressure
Tappet 3 rotates, and by Fig. 4 and Fig. 5 and mechanics general knowledge, above-mentioned movement will cause second to shake
Arm 1 changes with the angle of horizontal plane, and now power arm L1 direction will change, and power arm L1
To taper into；It addition, the second end of the second rocking arm 1 will promote the first Rocker arm 5 to rotate clockwise one
Determining angle, now the direction of resistance arm L2 will change, and resistance arm L2 will become larger, and correspondingly first
The amount of spin of Rocker arm 5 also becomes big, finally makes the valve 6 in first Rocker arm 5 the first bottom portion that is arranged on
Lift amount also becomes larger.As shown in the dotted portion in Fig. 3 and Fig. 6, when described eccentric 2
When the anglec of rotation is 90 °, the center of rotation of described second rocking arm 1 rises to the peak of its duty,
B point position in the b part of i.e. Fig. 4, now, described power arm is minimum, resistance arm is maximum, valve
Lift is maximum.Accordingly, little by changing to greatly to make valve lift amount, make described eccentric 2 up time
Pin rotates, and principle is identical, and detailed process is contrary with said process, and here is omitted.
In the present invention, eccentric 2 often rotates an angle, all will change during the second rocking arm 1 rotates
The position of the heart, thus change valve lift amount, i.e. native system belongs to stepless regulated so that electromotor
Performance obtains higher lifting.It addition, the rotational angle range of eccentric 2 is 0 °-90 °,
Just valve lift amount can be realized by the change being minimal to maximum so that native system regulation and control are in hgher efficiency；
And corresponding eccentric 2 rotates operating element and also can be simplified, it is easy to manufactures and installs,
The most also improve the reliability of system.
In one embodiment of the present of invention, on described first Rocker arm 5 between the first end and the second end
Roller bearing 9 can be provided with, for and described second rocking arm 1 sliding contact so that with the second rocking arm it
Between friction less, manipulate in hgher efficiency.
Second end of described second rocking arm 1 shakes with described roller bearing 9 contact position and described second
First end of arm 1 and described driving cam 4 contact position, all in the arc concaved, are played counteracting or mend
Repay owing to the second rocking arm rotates the effect of the displacement increase and decrease brought.
In one embodiment of the present of invention, the center of rotation of described second rocking arm 1 is to its driving force effect
The vertical dimension of line is power arm L1, and described driving force provides by driving cam 4.
The center of rotation of described second rocking arm 1 is resistance arm L2 to the vertical dimension of its drag effect line,
Described resistance is produced by second rocking arm 1 rotation forces the first Rocker arm 5.
The invention enables valve lift amount as follows to maximum whole work process by minimum:
First, during normal working of engine, drive shaft 8 drives and drives cam 4 to rotate, and drives
Cam 4 drives the first end of the second rocking arm 1, makes the second rocking arm 1 swing around eccentric 2, the
Second end of two rocking arms 1 drives the first Rocker arm 5 to swing around hydraulic tappet 3 again, thus controls first
The lifting of the valve 6 in the first bottom portion of Rocker arm 5.
Time stepless regulated, corresponding driving means drives eccentric 2 inverse time by original state
Pin rotates, and often rotates an angle, and the center of eccentric 2 is all by the track along circular arc
Raise.Now, the second rocking arm 1 with eccentric 2 center as center of rotation also increases,
Second rocking arm 1 is all subjected to displacement in horizontally and vertically direction, and fixing driving cam 4 makes the
Two rocking arms 1 change with the angle of horizontal plane, and therefore power arm L1 direction changes, power arm L1
It is gradually reduced.Correspondingly, in the center of rotation elevation process of the second rocking arm 1, the second rocking arm 1
The second end the first Rocker arm 5 will be promoted to rotate clockwise certain angle, the now side of resistance arm L2
To changing, resistance arm L2 will become larger so that the rotation quantitative change of the first Rocker arm 5 is big.Finally
The lift amount being arranged on the valve 6 in first Rocker arm 5 the first bottom portion is also become larger, thus reaches
To the purpose of stepless regulated valve lift amount, improve automobile engine performance.Finally, if valve liter
Journey amount will be by being up to minimum, then by above-mentioned work process in turn, here is omitted.
The above is only the preferred embodiment of the present invention, it is noted that lead for this technology
For the those of ordinary skill in territory, under the premise without departing from the principles of the invention, it is also possible to make
Some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (9)
1. a continuous variable valve lift system, it is characterised in that including:
First rocking arm (5), its side, the first bottom contacts with valve (6) and can promote valve (6),
Second side, bottom is supported by hydraulic tappet (3)；
Drive cam (4), be fixed on camshaft (8)；
Second rocking arm (1) of single-piece, described driving cam (4) contacts and promotes described second to shake
First end of arm (1), the second end in contact of described second rocking arm (1) also promotes described first rocking arm
(5)；
Described second rocking arm (1) is arranged on eccentric (2), with the center of eccentric (2) is
Center of rotation；
Described eccentric (2) rotates, and the center of described eccentric (2) changes, corresponding
Ground changes power arm and the resistance arm of described second rocking arm (1), final change and the first rocking arm (5)
The lift of the valve (6) contacted.
Continuous variable valve lift system the most according to claim 1, it is characterised in that
The position change of the center of rotation of described second rocking arm (1), the most described power arm and resistance arm
Direction and size, described second rocking arm (1) change with the angle of horizontal plane, then drive institute
The amount of spin stating the first rocking arm (5) changes, and finally changes the lift of valve (6).
Continuous variable valve lift system the most according to claim 1, it is characterised in that
It is arranged in parallel drive shaft (7) with preset distance and described camshaft (8), described eccentric (2)
It is fixed in described drive shaft (7).
Continuous variable valve lift system the most according to claim 3, it is characterised in that
The slewing area of described eccentric (2) is 0 °-90 °.
Continuous variable valve lift system the most according to claim 4, it is characterised in that
When described eccentric (2) is centrally located at below described drive shaft (7) axis perpendicular, fixed
Justice is original state, and now, described power arm is maximum, resistance arm is minimum, and valve lift amount is minimum；
When the center of described eccentric (2) is forwarded to 90 ° counterclockwise by original state, described second
The center of rotation of rocking arm (1) rises to the peak of its duty, now, described power arm is minimum,
Resistance arm is maximum, and valve lift amount is maximum.
Continuous variable valve lift system the most according to claim 1, it is characterised in that
Between the first end and the second end, it is provided with roller bearing (9) on described first rocking arm (5), is used for
With the sliding contact of described second rocking arm (1).
Continuous variable valve lift system the most according to claim 6, it is characterised in that
Second end of described second rocking arm (1) and described roller bearing (9) contact position are in the arc concaved
Shape.
Continuous variable valve lift system the most according to claim 1, it is characterised in that
First end of described second rocking arm (1) and described driving cam (4) contact position are in the arc concaved
Shape.
Continuous variable valve lift system the most according to claim 1, it is characterised in that
The center of rotation of described second rocking arm (1) is power to the vertical dimension of its driving force position
Arm, described driving force provides by driving cam (4)；
The center of rotation of described second rocking arm (1) is resistance arm to the vertical dimension of its drag effect line,
Described resistance is produced by the second rocking arm (1) rotation forces the first rocking arm (5).
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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| CN102852584A CN102852584A (en) | 2013-01-02 |
| CN102852584B true CN102852584B (en) | 2016-09-21 |
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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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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101457665A (en) * | 2007-12-14 | 2009-06-17 | 现代自动车株式会社 | Continuous variable valve lift system |
| CN102155273A (en) * | 2011-04-08 | 2011-08-17 | 奇瑞汽车股份有限公司 | Variable gas distribution mechanism of engine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101080796B1 (en) * | 2008-12-04 | 2011-11-07 | 기아자동차주식회사 | Continuous variable valve lift apparatus |
| CN101503973A (en) * | 2009-03-27 | 2009-08-12 | 奇瑞汽车股份有限公司 | Air valve lift adjustable engine valve actuating mechanism |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101457665A (en) * | 2007-12-14 | 2009-06-17 | 现代自动车株式会社 | Continuous variable valve lift system |
| 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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