CN103925029A - Variable valve lift driving device - Google Patents
Variable valve lift driving device Download PDFInfo
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- CN103925029A CN103925029A CN201310014309.1A CN201310014309A CN103925029A CN 103925029 A CN103925029 A CN 103925029A CN 201310014309 A CN201310014309 A CN 201310014309A CN 103925029 A CN103925029 A CN 103925029A
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- valve lift
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Abstract
The invention discloses a variable valve lift driving device, relates to engine parts and aims to prolong the service life of parts and reduce processing costs and fuel consumption of an engine. The variable valve lift driving device comprises a valve, a valve connecting rod, a valve rocker and a cam shaft, the valve connecting rod is connected with the valve, the valve rocker is connected with the valve connecting rod, the cam shaft drives the valve to open or close, a swing arm and an adjusting gear are disposed between the valve rocker and the cam shaft, a first rotating center and a second rotating center are mounted on the swing arm, a driving portion is arranged on the adjusting gear, the cam shaft rotates to drive the swing arm to swing around the first rotating center to drive the valve connecting rod to perform linear reciprocating movement so as to achieve opening or closing of the valve, and the adjusting gear rotates around own gear shaft to drive the driving portion to rotate around the gear shaft so that the first rotating center rotates around the second rotating center. The variable valve lift driving device is used for achieving continuous variability of valve lift.
Description
Technical field
The present invention relates to engine components, relate in particular to a kind of variable valve lift driving device.
Background technique
Valve is a vitals in motor, for inputting fuel and discharge the waste gas after burning in motor.In engine art, valve lift refers to valve and opens moved height completely from being just opened to, namely the Lift of valve.The cam profile of the camshaft using in motor is different, and the valve lift obtaining is also different.The valve lift of conventional engines is changeless, the cam profile that is its camshaft only has a kind of, its lift design is that the balance under full operating mode is selected to motor, therefore this lift can not make motor all obtain good response in high velocity and low velocity zone, result is that motor both can not get best high speed efficiency, also can not get best low speed torque, just obtained under full operating mode the comparatively performance of balance.
Lift range variable technology (VVL, variable valve lift) can change its valve lift according to the different operating modes of motor, make motor can obtain good response in high velocity and low velocity zone, thereby improve high-speed power and the low speed torque of motor.Be embodied in: under motor different rotating speeds, mate suitable valve lift, during the slow-speed of revolution, system is used less valve lift, be conducive to like this increase the intensity raising velocity of combustion of air-flow in cylinder, reduce inflationtime, and then the low speed torque of raising motor, reduce fuel consume, during high rotating speed, use larger valve lift can significantly improve volumetric efficiency, and then the power stage while promoting high rotating speed.
Existing lift range variable technology is controlled effect according to it can be divided into section variable valve lift and continuously variable valve lift.Compare with section variable valve lift, continuously variable valve lift can coordinate the combustion system of motor better, has certain superiority.In existing variable valve lift driving device, be to obtain different valve lifts by changing the cam profile of camshaft mostly.Concrete way is to use knockdown camshaft, and this assembled camshaft is provided with a plurality of cams with different molded line, drives the to-and-fro motion of valve connecting rod, thereby make variable valve lift by the different cam profiles on this assembled camshaft.
But in using the process of this variable valve lift driving device conversion valve lift, the related components such as camshaft, valve connecting rod have all been born impulsive load in various degree, have reduced the working life of component.And knockdown camshaft is more complicated than traditional camshaft structure, quality is large, has increased processing cost and the fuel consumption of motor.
Summary of the invention
The embodiment of the present invention provides a kind of variable valve lift driving device, to improve the working life of component, reduces processing cost and the fuel consumption of motor.
For achieving the above object, embodiments of the invention adopt following technological scheme:
Variable valve lift driving device provided by the invention comprises valve, the valve connecting rod being connected with valve, the valve rocker being connected with valve connecting rod and drive valve to open or closed camshaft, is provided with swing arm and adjusts gear between valve rocker and camshaft; Described swing arm is provided with the first rotating center and the second rotating center, described adjustment gear is provided with drive portion, camshaft drives swing arm to swing to drive the to-and-fro motion of valve link linear to realize opening of valve or closure around the first rotating center while rotating, and adjusts gear and drives drive portion to rotate so that the first rotating center rotates around the second rotating center around gear shaft when the gear shaft of self rotates.
Particularly, described drive portion is be located at the through hole on described adjustment gear and be located at the rotatingshaft in through hole, and described the first rotating center is the first through hole, and described rotatingshaft is located in the first through hole.
Particularly, the second rotating center is the second through hole, in the second through hole, is provided with bearing pin, and the gear shaft of bearing pin and described adjustment gear coaxially arranges, and the swing arm roller coordinating with described cam is installed on described bearing pin.
Preferably, described adjustment gear is helical gear, and helical gear is engaged with driving gear, and driving gear is connected with driving source.
Further, described camshaft is supported on bearing support, is also provided with mounting hole on bearing support, and gear shaft is located in mounting hole.
Further, between gear shaft and mounting hole, be provided with pin, and pin seals by plug screw, plug screw is provided with draining hole.
For improving the lubrication effect of gear shaft, the surrounding that is positioned at described mounting hole on bearing support is provided with oil duct.
For making the smooth return of swing arm, described rotatingshaft is provided with return spring, and one end of return spring is connected with adjustment gear, the other end is connected with swing arm.
Enter for making swing arm rotation more smooth-going, between described rotatingshaft and described the first through hole, be provided with bearing.
For simplifying processing and assembly technology, rotatingshaft is one-body molded with adjustment gear.
For the variable valve lift driving device providing for the embodiment of the present invention, when the first rotating center is positioned at a position, can realize a kind of valve lift, when adjusting when the gear shaft of gear around self rotates, drive drive portion to rotate so that the first rotating center rotates around the second rotating center around gear shaft.Along with the first rotating center rotates around the second rotating center, the circumferential position of relative the second rotating center of the first rotating center changes thereupon, therefore realize the valve lift changing, reached the object that valve lift driving device changes valve lift according to the different applying working conditions of motor.The mode that realizes lift range variable in the embodiment of the present invention is to use assembled camshaft to realize the mode of lift range variable in prior art different, can due to the cam that change has different molded line, not drive valve link motion and the component such as camshaft, valve connecting rod be produced to percussion, extend the working life of the related components such as camshaft, valve connecting rod; And owing to a plurality of cams with different molded line can not being set on camshaft, therefore with the embodiment of the present invention in the camshaft structure that is used in conjunction with of swing arm simple, quality is little, has reduced processing cost and the fuel consumption of motor.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, below the accompanying drawing of required use during embodiment is described is briefly described.
The structural representation of the variable valve lift driving device that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the decomposition texture schematic diagram of Fig. 1;
Fig. 3 adjusts the structural representation of gear shown in Fig. 2;
Fig. 4 is the structural representation of swing arm shown in Fig. 2;
Fig. 5 adjusts the plan view of gear shown in Fig. 2;
Fig. 6 is the structural representation of bearing support shown in Fig. 2;
The plan view of the variable valve lift driving device that Fig. 7 provides for the embodiment of the present invention;
Fig. 8 is that different air valve lift is with the variation relation plotted curve of crank angle.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technological scheme in the embodiment of the present invention is clearly described.
The structural representation of the variable valve lift driving device that Fig. 1 provides for the embodiment of the present invention, the decomposition texture schematic diagram that Fig. 2 is Fig. 1.As depicted in figs. 1 and 2, this variable valve lift driving device comprises valve 1, the valve connecting rod 2 being connected with valve 1, the valve rocker 3 being connected with valve connecting rod 2 and drives valve 1 to open or closed camshaft 7, is provided with swing arm 4 and adjusts gear 5 between valve rocker 3 and camshaft 7; Swing arm 4 is provided with the first rotating center 42 and the second rotating center 41, adjust gear 5 and be provided with drive portion 52, camshaft 7 drives swing arm 4 to swing to drive 2 straight reciprocating motions of valve connecting rod to realize opening of valve 1 or closure around the first rotating center 42 while rotating, and adjusts gear 5 and when the gear shaft 51 of self rotates, drives drive portion 52 to rotate so that the first rotating center 42 rotates around the second rotating center 41 around gear shaft 51.
In the variable valve lift driving device that the embodiment of the present invention provides like this, when the first rotating center is positioned at a position, can realize a kind of valve lift, when adjusting when the gear shaft of gear around self rotates, drive drive portion to rotate so that the first rotating center rotates around the second rotating center around gear shaft.Along with the first rotating center rotates around the second rotating center, the circumferential position of relative the second rotating center of the first rotating center changes thereupon, therefore realize the valve lift changing, reached the object that valve lift driving device changes valve lift according to the different applying working conditions of motor.The mode that realizes lift range variable in the embodiment of the present invention is to use assembled camshaft to realize the mode of lift range variable in prior art different, can due to the cam that change has different molded line, not drive valve link motion and the component such as camshaft, valve connecting rod be produced to percussion, extend the working life of the related components such as camshaft, valve connecting rod; And owing to a plurality of cams with different molded line can not being set on camshaft, therefore with the embodiment of the present invention in the camshaft structure that is used in conjunction with of swing arm simple, quality is little, has reduced processing cost and the fuel consumption of motor.
Adjustment process from above-described the first rotating center position, the first rotating center can be called to the driving center of valve lift, the adjustment center that the second rotating center is called to valve lift, therefore the variable valve lift driving device that the embodiment of the present invention provides is all integrated in swing arm by driving center and adjustment center, than its driving center and adjustment center are arranged to two structures on component, simplify the structure, reduced the usage quantity of component.In addition, because the adjustment of the first rotating center position is rotated and realized around the second rotating center by the first rotating center, therefore we can keep the invariant position of the second rotating center just to make the first rotating center do plane motion in this adjustment process, the forms of motion of swing arm is simple like this, the assembly relation of swing arm and other related components is also fairly simple, thereby has reduced its requirement to machining accuracy and assembly precision.
In like manner, gear shaft can be called to the rotation section of adjusting gear, the present invention adopts and adjusts the position that gear is adjusted the first rotating center, can well rotation section and drive portion be all integrated on adjustment gear, than rotation section and drive portion are arranged to two structures on component, simplify the structure, reduced the usage quantity of component.
Fig. 3 adjusts the structural representation of gear in the embodiment of the present invention, Fig. 4 is the structural representation of swing arm in the embodiment of the present invention.As shown in Figure 3 and Figure 4, the drive portion of adjusting in the present embodiment on gear 5 is to be located at adjust the through hole on gear 5 and be located at the rotatingshaft 521 in through hole, and the first rotating center 42 of swing arm 4 is the first through hole, and rotatingshaft 521 is located in the first through hole.Namely rotatingshaft is simultaneously through through hole and the first through hole realization adjustment gear in swing arm and the connection of swing arm adjusted on gear, and the first rotating center 42 and rotatingshaft 521 coaxially arrange.The driving center 42 of the direct driving swing arm 4 of rotatingshaft 522 turns over certain angle with respect to the adjustment center 41 of swing arm 4 like this, therefore can control easily the angular displacement of line between driving center 42 and adjustment center 41, simplifies the structure and control procedure.Wherein rotatingshaft 521 is preferably one-body molded with adjustment gear 5, simplifies on the one hand processing and assembly technology, avoids on the other hand the rotation of rotatingshaft self.In order to make the rotation of swing arm more smooth-going, between described rotatingshaft and described the first through hole, be provided with bearing 21 simultaneously.
In addition in the above-described embodiments, because the driving center 42 of rotatingshaft 122 and swing arm 4 coaxially arranges, swing arm 4 is just rotated and is realized opening and closing of valve around rotatingshaft 122.After crossing swing arm for the ease of the maximum end of the cam on camshaft, make the smooth return of swing arm, as shown in Figure 3, the present invention arranges return spring 522 on rotatingshaft 521, and one end of return spring 522 is connected with adjustment gear 5, the other end is connected with swing arm 4.Return spring 522 drives swing arm 4 returns like this.The specific implementation form of return spring can be torsion spring, and insert in the groove 45 of swing arm as shown in Figure 4 one end of torsion spring, and the other end inserts shown in Fig. 5 and adjusts in the mounting hole 55 of gear 5.The large end of camshaft overhead cam drives swing arm to rotate in one direction like this, and after swing arm is crossed in the maximum end rotation of cam, the small end of cam contacts with swing arm, and now torsion spring drives swing arm around the center of driving counter-rotation, realizes the return of swing arm.Groove 45 is more easily fixed in swing arm 4 return spring 522, quick and easy for installation, has improved the working stability of swing arm.In order to prevent that return spring 522 from axial transmission occurring, the present embodiment is also provided with annular boss 523 on rotatingshaft 521 and at the two ends of return spring 522, to guarantee the stability of work.In order to reduce the weight of adjusting gear, as shown in Figure 3 and Figure 5, the present embodiment is provided with arc duplicate removal structure 53 and drain pan 54 on adjustment gear 5.Duplicate removal structure can alleviate quality in the situation that of proof strength on the one hand, and drain pan can prevent its trapped fuel in the course of the work on the other hand, gains in weight, and affects the stability of system works.
In addition, as shown in Figure 4, the second rotating center 41 is the second through hole, in the second through hole, is provided with bearing pin, and the gear shaft of bearing pin and described adjustment gear coaxially arranges, and the swing arm roller 43 coordinating with cam is installed on bearing pin.Camshaft 7 drives swing arm roller 43 so that swing arm 4 swings and realizes opening or closure of valve 1 around rotatingshaft 521 like this, adjusts gear rotation and drives swing arm around gear shaft 51, to rotate to regulate the position of the first rotating center 42.
Wherein, adjusting gear 5 is helical gear, and helical gear is engaged with driving gear 6, and driving gear 6 is connected with not shown driving source.Driving source can be motor, or can be for motor and the gear being connected with motor, as retarder.Driving source drives driving gear rotation, and driving gear drives the adjustment gear being engaged with to rotate to realize the adjustment of the first rotating center position of swing arm.Certainly in other embodiments of the invention, adjusting gear also can be simpler for structure, the spur gear of more convenient processing.
In addition, camshaft 7 is supported on bearing support 8, is also provided with mounting hole 82 on bearing support 8, and gear shaft 51 is located in mounting hole 82.Bearing support plays the effect of fixed support camshaft and adjustment gear simultaneously like this, has simplified the structure of system.
For improving the lubrication effect of gear shaft, the surrounding that the present embodiment is positioned at described mounting hole on bearing support is provided with oil duct, and oil duct connects filler opening 831 and oil outlet 832, and independently oil duct is set on bearing support, and lubrication effect is better.
As the further improvement of above-described embodiment, between gear shaft 51 and mounting hole 82, be provided with pin 81, and pin 82 seals by plug screw 84, plug screw 84 is provided with draining hole.Pin is fixed gear shaft further, and the draining hole on plug screw can release the lubricant oil of gear shaft.
For a cylinder, there are two intake valves, the corresponding intake valve of while swing arm, if change radius, the arc length of cambered surface of the working surface 44 of one of them swing arm, and the length of plane, just can realize by a variable valve lift driving device object of two different air valve lifts.
Below in conjunction with Fig. 7 and Fig. 8, with a specific embodiment, introduce motor under different operating modes, the working principle of variable valve lift driving device of the present invention and working procedure.
The plan view of the variable valve lift driving device that Fig. 7 provides for the embodiment of the present invention, Fig. 8 is that different air valve lift is with the variation relation plotted curve of crank angle.As can be seen from Figure 7, variable valve lift driving device of the present invention comprise valve 1, the valve connecting rod 2 being connected with valve 1, the valve rocker 3 being connected with valve connecting rod 2 and drive valve open or closed camshaft 7 and be located at valve rocker 3 and camshaft 7 between swing arm 4 and adjust gear 5, adjust gear 5 and be engaged with driving gear 6, driving gear 6 is connected with not shown driving source, as stepper motor.Shown in Fig. 7, have four center of rotation A, B, C, swing arm 4 is E with the point of contact of valve rocker 3, and the angle between the line AB of center of rotation A, B and the line BC of center of rotation B, C is β.
Operating mode 1: high engine speeds full-load operation
First, ECU under this operating mode (electric control unit) electronic control unit is determined the position that center of rotation C should locate, then calculating accordingly adjustment gear 5 answers residing position and infers the angle that stepper motor need to rotate, again the signal of this angle is passed to stepper motor, last stepper motor rotates to be with nutating gear 6 according to this signal, driving gear 6 drives adjustment gear 5 to rotate and makes center of rotation C around center of rotation B rotation until center of rotation arrival precalculated position, this hour angle β is a less angle, for example 125 °.And the position that the point of contact E of now swing arm 4 and valve rocker 3 keeps left and holds in swing arm, therefore can obtain the larger valve lift 1 shown in Fig. 8.Under the cooperation with Variable Valve Time, can make motor reach compared with high pulling torque when high speed.
Operating mode 2: motor is in Low-speed full-load work
ECU forwards adjustment gear 3 to another precalculated position with identical method control step motor.Now the angle β of line AB and line BC increases, and for example β is 130 °, and point of contact is that E moves right.Therefore the valve lift 2 obtaining declines to some extent with respect to valve lift 1, but valve opening and close moment are constant, so under the cooperation with Variable Valve Time, can make motor obtain compared with high pulling torque when low speed.
Operating mode 3: engine section load operation
ECU forwards adjustment gear 3 to another precalculated position with identical method control step motor.Now the angle β of line AB and line BC continue to increase, and for example β is 130 °-160 °, and in this angular range continuous variable.Point of contact E continues to move right.Therefore the valve lift 3 obtaining continues to decline with respect to valve lift 2, but valve opening and close moment are constant, so under the cooperation with Variable Valve Time, can reduce pumping loss, reduces engine consumption.
Operating mode 4: engine idle
ECU forwards adjustment gear 3 to another precalculated position with identical method control step motor.Now the angle β of line AB and line BC continues to increase, and for example β is 160 °.Point of contact E continues to move right.Therefore the valve lift 4 obtaining continues to decline with respect to valve lift 3, but valve opening and close moment are constant, so under the cooperation with Variable Valve Time, can make engine idle speed stability best.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (10)
1. a variable valve lift driving device, the valve connecting rod that comprise valve, is connected with valve, the valve rocker being connected with valve connecting rod and driving valve are opened or closed camshaft, it is characterized in that, between valve rocker and camshaft, be provided with swing arm and adjust gear; Described swing arm is provided with the first rotating center and the second rotating center, described adjustment gear is provided with drive portion, camshaft drives swing arm to swing to drive the to-and-fro motion of valve link linear to realize opening of valve or closure around the first rotating center while rotating, and adjusts gear and drives drive portion to rotate so that the first rotating center rotates around the second rotating center around gear shaft when the gear shaft of self rotates.
2. variable valve lift driving device according to claim 1, it is characterized in that, described drive portion is be located at the through hole on described adjustment gear and be located at the rotatingshaft in through hole, and described the first rotating center is the first through hole, and described rotatingshaft is located in the first through hole.
3. variable valve lift driving device according to claim 1 and 2, it is characterized in that, the second rotating center is the second through hole, in the second through hole, is provided with bearing pin, the gear shaft of bearing pin and described adjustment gear coaxially arranges, and the swing arm roller coordinating with described cam is installed on described bearing pin.
4. variable valve lift driving device according to claim 1, is characterized in that, described adjustment gear is helical gear, and helical gear is engaged with driving gear, and driving gear is connected with driving source.
5. variable valve lift driving device according to claim 1, is characterized in that, described camshaft is supported on bearing support, is also provided with mounting hole on bearing support, and gear shaft is located in mounting hole.
6. variable valve lift driving device according to claim 5, is characterized in that, between gear shaft and mounting hole, is provided with pin, and pin seals by plug screw, and plug screw is provided with draining hole.
7. variable valve lift driving device according to claim 6, is characterized in that, the surrounding that is positioned at described mounting hole on bearing support is provided with oil duct.
8. variable valve lift driving device according to claim 2, is characterized in that, described rotatingshaft is provided with return spring, and one end of return spring is connected with adjustment gear, the other end is connected with swing arm.
9. variable valve lift driving device according to claim 2, is characterized in that, between described rotatingshaft and described the first through hole, is provided with bearing.
10. variable valve lift driving device according to claim 9, is characterized in that, rotatingshaft is one-body molded with adjustment gear.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310014309.1A CN103925029B (en) | 2013-01-15 | 2013-01-15 | Variable valve lift driving device |
| PCT/CN2013/090810 WO2014110969A1 (en) | 2013-01-15 | 2013-12-28 | Driving apparatus with variable valve lift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310014309.1A CN103925029B (en) | 2013-01-15 | 2013-01-15 | Variable valve lift driving device |
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| Publication Number | Publication Date |
|---|---|
| CN103925029A true CN103925029A (en) | 2014-07-16 |
| CN103925029B CN103925029B (en) | 2016-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310014309.1A Active CN103925029B (en) | 2013-01-15 | 2013-01-15 | Variable valve lift driving device |
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| CN (1) | CN103925029B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104481626A (en) * | 2014-11-28 | 2015-04-01 | 长城汽车股份有限公司 | Valve mechanism for engine, engine with the same and vehicle |
| CN107956528A (en) * | 2016-10-18 | 2018-04-24 | 舍弗勒技术股份两合公司 | The intermediate lever of variable stigmatic opening transmission device |
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| JP5115748B2 (en) * | 2009-02-13 | 2013-01-09 | スズキ株式会社 | Variable valve operating device for internal combustion engine |
| DE102011106565A1 (en) * | 2011-07-05 | 2013-01-10 | Rolf Jung | Full variable stroke valve controller for internal combustion engine, has lever whose return spring is formed as yoke spring, where windings of yoke spring are arranged below cam shaft, and leg of yoke spring engages from downside at lever |
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| US20010035141A1 (en) * | 2000-02-24 | 2001-11-01 | Pierik Ronald J. | Ring gear variable valve train device |
| DE10211969A1 (en) * | 2002-03-19 | 2003-10-02 | Bayerische Motoren Werke Ag | Valve gear for reciprocating piston engine has connecting element in frictional contact with first operating element and form-locking on driven spindle, and with roller between first operating element and connecting element |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104481626A (en) * | 2014-11-28 | 2015-04-01 | 长城汽车股份有限公司 | Valve mechanism for engine, engine with the same and vehicle |
| CN107956528A (en) * | 2016-10-18 | 2018-04-24 | 舍弗勒技术股份两合公司 | The intermediate lever of variable stigmatic opening transmission device |
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| Publication number | Publication date |
|---|---|
| CN103925029B (en) | 2016-04-06 |
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