CN103925029B - Variable valve lift driving device - Google Patents
Variable valve lift driving device Download PDFInfo
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- CN103925029B CN103925029B CN201310014309.1A CN201310014309A CN103925029B CN 103925029 B CN103925029 B CN 103925029B CN 201310014309 A CN201310014309 A CN 201310014309A CN 103925029 B CN103925029 B CN 103925029B
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Abstract
The invention discloses a kind of variable valve lift driving device, relate to engine components, be used for improving working life of component, reduce processing cost and the fuel consumption of motor.Described variable valve lift driving device comprises valve, the valve connecting rod be connected with valve, the valve rocker be connected with valve connecting rod and drives valve to open or closed camshaft, is provided with swing arm and adjustment 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, drive swing arm to swing to drive the to-and-fro motion of valve link linear to realize opening of valve or closed around the first rotating center during cam axle, adjustment gear drives drive portion to rotate around gear shaft to make the first rotating center rotate around the second rotating center when the gear shaft of self rotates.The present invention is for realizing the continuous variable of valve lift.
Description
Technical field
The present invention relates to engine components, particularly relate 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 used in motor is different, and the valve lift obtained is also different.The valve lift of conventional engines is changeless, namely the cam profile of its camshaft only has one, the design of its lift selects the balance of motor under full working scope, 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 obtain the performance comparatively balanced under full working scope.
Lift range variable technology (VVL, variablevalvelift) its valve lift can be changed according to the different operating modes of motor, make motor can obtain good response in high velocity and low velocity zone, thus 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 uses less valve lift, the intensity being conducive to increasing air-flow in cylinder like this improves velocity of combustion, reduce inflationtime, and then improve the low speed torque of motor, reduce fuel consume, during high rotating speed, use larger valve lift then can significantly improve volumetric efficiency, and then power stage when promoting high rotating speed.
Existing lift range variable technology can be divided into section variable valve lift and continuously variable valve lift according to its control effects.Compared 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 that the cam profile by changing camshaft obtains different valve lifts mostly.Concrete way uses knockdown camshaft, and this assembled camshaft is provided with multiple cam with different molded line, drives the to-and-fro motion of valve connecting rod, thus make variable valve lift by the different cam profiles on this assembled camshaft.
But in the process using this variable valve lift driving device conversion valve lift, the related components such as camshaft, valve connecting rod all bear impulsive load in various degree, reduce the working life of component.And knockdown camshaft is more complicated than traditional camshaft structure, quality large, adds 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 be connected with valve, the valve rocker be connected with valve connecting rod and drives valve to open or closed camshaft, is provided with swing arm and adjustment 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, drive swing arm to swing to drive the to-and-fro motion of valve link linear to realize opening of valve or closed around the first rotating center during cam axle, adjustment gear drives drive portion to rotate around gear shaft to make the first rotating center rotate around the second rotating center when the gear shaft of self rotates.
Specifically, described drive portion is the through hole be located on described adjustment gear and the rotatingshaft be located in through hole, and described first rotating center is the first through hole, and described rotatingshaft is located in the first through hole.
Specifically, the second rotating center is the second through hole, is provided with bearing pin in the second through hole, and the gear shaft of bearing pin and described adjustment gear is coaxially arranged, and described bearing pin is provided with the swing arm roller with described cam engagement.
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 support, on bearing support, bearing support is also provided with mounting hole, and gear shaft is located in mounting hole.
Further, between gear shaft and mounting hole, be provided with pin, and pin is sealed by plug screw, plug screw is provided with oil leak hole.
For improving the lubrication effect of gear shaft, bearing support being positioned at around described mounting hole and being 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.
Entering for making swing arm rotate more smooth-going, between described rotatingshaft and described first through hole, being provided with bearing.
For simplifying processing and assembly technology, rotatingshaft is one-body molded with adjustment gear.
For the variable valve lift driving device that the embodiment of the present invention provides, a kind of valve lift can be realized when the first rotating center is positioned at a position, drive drive portion to rotate to make the first rotating center rotate around the second rotating center around gear shaft when adjusting the gear shaft of gear around self and rotating.Along with the first rotating center rotates around the second rotating center, the circumferential position of relative second rotating center of the first rotating center changes thereupon, therefore achieve the valve lift of change, reach the object that valve lift driving device changes valve lift according to the different applying working conditions of motor.The mode realizing 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, percussion can not be produced to drive valve link motion to component such as camshaft, valve connecting rods owing to changing the cam with different molded line, extend the working life of the related components such as camshaft, valve connecting rod; And due to multiple cam with different molded line can not be arranged on camshaft, therefore with the swing arm in the embodiment of the present invention with the use of camshaft structure simple, quality is little, reduces 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 used required in describing embodiment 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 is the structural representation of the gear of adjustment shown in Fig. 2;
Fig. 4 is the structural representation of swing arm shown in Fig. 2;
Fig. 5 is the plan view of the gear of adjustment 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 the variation relation plotted curve of different air valve lift with 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, Fig. 2 is the decomposition texture schematic diagram of Fig. 1.As depicted in figs. 1 and 2, this variable valve lift driving device comprises valve 1, the valve connecting rod 2 be connected with valve 1, the valve rocker 3 be connected with valve connecting rod 2 and drives valve 1 to open or closed camshaft 7, is provided with swing arm 4 and adjustment 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, adjustment gear 5 is provided with drive portion 52, drive swing arm 4 to swing to drive valve connecting rod 2 straight reciprocating motion to realize opening of valve 1 or closed around the first rotating center 42 when camshaft 7 rotates, adjustment gear 5 drives drive portion 52 to rotate the first rotating center 42 is rotated around the second rotating center 41 around gear shaft 51 when the gear shaft 51 of self rotates.
In the variable valve lift driving device that such embodiment of the present invention provides, a kind of valve lift can be realized when the first rotating center is positioned at a position, drive drive portion to rotate to make the first rotating center rotate around the second rotating center around gear shaft when adjusting the gear shaft of gear around self and rotating.Along with the first rotating center rotates around the second rotating center, the circumferential position of relative second rotating center of the first rotating center changes thereupon, therefore achieve the valve lift of change, reach the object that valve lift driving device changes valve lift according to the different applying working conditions of motor.The mode realizing 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, percussion can not be produced to drive valve link motion to component such as camshaft, valve connecting rods owing to changing the cam with different molded line, extend the working life of the related components such as camshaft, valve connecting rod; And due to multiple cam with different molded line can not be arranged on camshaft, therefore with the swing arm in the embodiment of the present invention with the use of camshaft structure simple, quality is little, reduces processing cost and the fuel consumption of motor.
From the adjustment process of above-described first rotating center position, first rotating center can be called the driving center of valve lift, second rotating center is called the adjustment center of valve lift, driving center and adjustment center are all integrated in swing arm by the variable valve lift driving device that therefore embodiment of the present invention provides, compared to the structure its driving center and adjustment center are arranged on two component, simplify the structure, decrease the usage quantity of component.In addition, because the adjustment of the first rotating center position rotates realization by the first rotating center around the second 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 such swing arm is simple, the assembly relation of swing arm and other related components is also fairly simple, thus reduces its requirement to machining accuracy and assembly precision.
In like manner, gear shaft can be called the rotation section of adjustment gear, the present invention adopts adjustment gear to adjust the position of the first rotating center, well rotation section and drive portion all can be integrated on adjustment gear, compared to structure rotation section and drive portion are arranged on two component, simplify the structure, decrease the usage quantity of component.
Fig. 3 is the structural representation adjusting gear in the embodiment of the present invention, and 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 adjusted in the present embodiment on gear 5 is the through hole be located on adjustment gear 5 and the rotatingshaft 521 be located 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 realizes the connection of adjustment gear and swing arm simultaneously through the through hole on adjustment gear and the first through hole in swing arm, and namely the first rotating center 42 and rotatingshaft 521 are coaxially arranged.The driving center 42 of such rotatingshaft 522 Direct driver swing arm 4 turns over certain angle relative to the adjustment center 41 of swing arm 4, therefore, it is possible to control the angular displacement of line between driving center 42 and adjustment center 41 easily, simplifies the structure and control procedure.Wherein rotatingshaft 521 is preferably one-body molded with adjustment gear 5, simplifies processing and assembly technology on the one hand, avoids the rotation of rotatingshaft self on the other hand.Simultaneously in order to make the rotation of swing arm more smooth-going, between described rotatingshaft and described first through hole, be provided with bearing 21.
In addition in the above-described embodiments, because the driving center 42 of rotatingshaft 122 and swing arm 4 is coaxially arranged, swing arm 4 is just rotated around rotatingshaft 122 and is realized opening and closedown of valve.Make the smooth return of swing arm after crossing swing arm for the ease of the maximum end of the cam on camshaft, 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.Such return spring 522 drives swing arm 4 return.The specific implementation form of return spring can be torsion spring, and one end of torsion spring is inserted in the groove 45 of swing arm as shown in Figure 4, and the other end inserts in the mounting hole 55 of the gear 5 of adjustment shown in Fig. 5.The large end of such camshaft overhead cam drives swing arm to rotate in one direction, and after the maximum end of cam rotates beyond swing arm, the small end of cam contacts with swing arm, and now torsion spring drives swing arm around driving center counter-rotation, realizes the return of swing arm.Groove 45 makes return spring 522 more easily be fixed in swing arm 4, quick and easy for installation, improves the working stability of swing arm.In order to prevent return spring 522 from axial transmission occurring, the present embodiment is also provided with annular boss 523 at the two ends of return spring 522, to ensure the stability of work on rotatingshaft 521.In order to reduce the weight of adjustment 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 when 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, the stability of influential system work.
In addition, as shown in Figure 4, the second rotating center 41 is the second through hole, is provided with bearing pin in the second through hole, and the gear shaft of bearing pin and described adjustment gear is coaxially arranged, and bearing pin is provided with the swing arm roller 43 with cam engagement.Such camshaft 7 drives swing arm roller 43 to realize opening of valve 1 or closed to make swing arm 4 around rotatingshaft 521 swing, and adjustment pinion rotation drives swing arm to rotate around gear shaft 51 position regulating the first rotating center 42.
Wherein, adjustment 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 the gear that can be motor and be connected with motor, as retarder.Driving source drives driving gear to rotate, and driving gear drives the adjustment pinion rotation be engaged with to realize the adjustment of the first rotating center position of swing arm.Certainly in other embodiments of the invention, adjustment gear also can be the spur gear of simpler, the more convenient processing of structure.
In addition, camshaft 7 is supported on bearing support 8, and bearing support 8 is also provided with mounting hole 82, and gear shaft 51 is located in mounting hole 82.Such bearing support plays the effect of fixed support camshaft and adjustment gear simultaneously, simplifies the structure of system.
For improving the lubrication effect of gear shaft, the present embodiment is positioned at around described mounting hole and is provided with oil duct on bearing support, and oil duct connects filler opening 831 and oil outlet 832, and bearing support is arranged independently oil duct, lubrication effect is better.
As the further improvement of above-described embodiment, be provided with pin 81 between gear shaft 51 and mounting hole 82, and pin 82 is sealed by plug screw 84, plug screw 84 is provided with oil leak hole.Pin can further fixed gear shaft, and the oil leak hole on plug screw can release the lubricant oil of gear shaft.
Two intake valves are had for a cylinder, a corresponding intake valve of swing arm simultaneously, if change radius, the arc length of the cambered surface of the working surface 44 of one of them swing arm, and the length of plane, the object of two different air valve lifts just can be realized by a variable valve lift driving device.
Below in conjunction with Fig. 7 and Fig. 8, introduce motor under different operating mode with a specific embodiment, 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 the variation relation plotted curve of different air valve lift with crank angle.As can be seen from Figure 7, variable valve lift driving device of the present invention comprises valve rocker 3 that valve connecting rod 2 that valve 1 is connected with valve 1 is connected with valve connecting rod 2 and drives valve to open or closed camshaft 7 and the swing arm 4 be located between valve rocker 3 and camshaft 7 and adjust gear 5, adjustment gear 5 is engaged with driving gear 6, driving gear 6 is connected with not shown driving source, as stepper motor.Have four center of rotation A, B, C shown in Fig. 7, swing arm 4 and the point of contact of valve rocker 3 are E, center of rotation A, angle between the line BC of the line AB of B and center of rotation B, C is β.
Operating mode 1: high engine speeds full-load operation
First, the position that ECU (electriccontrolunit) electronic control unit determination center of rotation C should locate under this operating mode, then calculate adjustment gear 5 accordingly answer residing position and infer that stepper motor needs the angle of rotating, again the signal of this angle is passed to stepper motor, last stepper motor rotates according to this signal to be with nutating gear 6, 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 arrives precalculated position, this hour angle β is a less angle, such as 125 °.The position of holding and now swing arm 4 and the point of contact E of valve rocker 3 keep left in swing arm, therefore can obtain the larger valve lift 1 shown in Fig. 8.With under the cooperation of Variable Valve Time, motor can be made to reach comparatively high pulling torque when high speed.
Operating mode 2: motor is in Low-speed full-load work
The identical method control step motor of ECU forwards adjustment gear 3 to another precalculated position.Now the angle β of line AB and line BC increases, and such as β is 130 °, and point of contact is that E moves right.Therefore the valve lift 2 obtained declines to some extent relative to valve lift 1, but valve opening and close moment constant, so with under the cooperation of Variable Valve Time, motor can be made to obtain comparatively high pulling torque when low speed.
Operating mode 3: part load engine operation
The identical method control step motor of ECU forwards adjustment gear 3 to another precalculated position.Now the angle β of line AB and line BC continues to increase, and such as β is 130 °-160 °, and in this angular range continuous variable.Point of contact E continues to move right.Therefore the valve lift 3 obtained relative to valve lift 2 continue decline, but valve opening and close moment constant, so with under the cooperation of Variable Valve Time, can pumping loss be reduced, reduce engine consumption.
Operating mode 4: engine idle
The identical method control step motor of ECU forwards adjustment gear 3 to another precalculated position.Now the angle β of line AB and line BC continues to increase, and such as β is 160 °.Point of contact E continues to move right.Therefore the valve lift 4 obtained relative to valve lift 3 continue decline, but valve opening and close moment constant, so with under the cooperation of Variable Valve Time, engine idle speed stability can be made best.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within 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, comprise valve, the valve connecting rod be connected with valve, the valve rocker be connected with valve connecting rod and drive valve to open or closed camshaft, it is characterized in that, between valve rocker and camshaft, be provided with swing arm and adjustment gear; Described swing arm is provided with the first rotating center and the second rotating center, described adjustment gear is provided with drive portion, drive swing arm to swing to drive the to-and-fro motion of valve link linear to realize opening of valve or closed around the first rotating center during cam axle, adjustment gear drives drive portion to rotate around gear shaft to make the first rotating center rotate around the second rotating center 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 the through hole be located on described adjustment gear and the rotatingshaft be located in through hole, and described 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, is provided with bearing pin in the second through hole, the gear shaft of bearing pin and described adjustment gear is coaxially arranged, and described bearing pin is provided with the swing arm roller with described cam engagement.
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 support, on bearing support, bearing support is also provided with mounting hole, 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, be provided with pin, and pin is sealed by plug screw, and plug screw is provided with oil leak hole.
7. variable valve lift driving device according to claim 6, is characterized in that, bearing support is positioned at around described mounting hole and 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, is provided with bearing between described rotatingshaft and described first through hole.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103925029A CN103925029A (en) | 2014-07-16 |
| CN103925029B true 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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104481626B (en) * | 2014-11-28 | 2017-04-19 | 长城汽车股份有限公司 | Valve mechanism for engine, engine with the same and vehicle |
| DE102016220396A1 (en) * | 2016-10-18 | 2017-08-10 | Schaeffler Technologies AG & Co. KG | Intermediate lever of a variable valve train |
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| 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 |
| EP1387050A1 (en) * | 2002-08-02 | 2004-02-04 | Bayerische Motoren Werke Aktiengesellschaft | Cylinder head for an internal combustion engine with variable lift valve drive |
| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6382151B2 (en) * | 2000-02-24 | 2002-05-07 | Delphi Technologies, Inc. | Ring gear variable valve train device |
| JP2004138058A (en) * | 2003-10-06 | 2004-05-13 | Takashi Fujimaki | Variable valve system |
| JP2008303765A (en) * | 2007-06-06 | 2008-12-18 | Honda Motor Co Ltd | Variable valve gear of internal combustion engine |
| US20100059005A1 (en) * | 2008-09-08 | 2010-03-11 | Stone Albert C | Method and apparatus for adjusting variable valve lift |
| JP5651710B2 (en) * | 2010-12-21 | 2015-01-14 | 川崎重工業株式会社 | Valve gear |
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2013
- 2013-01-15 CN CN201310014309.1A patent/CN103925029B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| EP1387050A1 (en) * | 2002-08-02 | 2004-02-04 | Bayerische Motoren Werke Aktiengesellschaft | Cylinder head for an internal combustion engine with variable lift valve drive |
| 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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