CN201891455U - Lift adjusting mechanism of engine valve - Google Patents
Lift adjusting mechanism of engine valve Download PDFInfo
- Publication number
- CN201891455U CN201891455U CN2010206139477U CN201020613947U CN201891455U CN 201891455 U CN201891455 U CN 201891455U CN 2010206139477 U CN2010206139477 U CN 2010206139477U CN 201020613947 U CN201020613947 U CN 201020613947U CN 201891455 U CN201891455 U CN 201891455U
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- China
- Prior art keywords
- swing arm
- rocking arm
- main axis
- axis
- arm end
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
- F01L2013/0068—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
Abstract
The utility model relates to a lift adjusting mechanism of an engine valve, which comprises an eccentric control shaft, a rocker arm, a cam shaft, a swing arm and an elastic part, wherein the eccentric control shaft is provided with a main axis and an eccentric axis parallel to the main axis, and the eccentric control shaft can be externally controlled to rotate around the main axis and stabilized at a certain rotation angle; the rocker arm is hinged on the eccentric control shaft by taking the eccentric axis as an axle center, the rocker arm is provided with a first rocker arm end extending towards the radial direction of a first direction and far away from the eccentric axis and a second rocker arm end radially extending towards a second direction and far away from the eccentric axis, and the first direction is different from the second direction; the cam shaft acts on the first rocker arm end so as to drive the rocker arm to swing around the eccentric axis; the swing arm is hinged on the eccentric control shaft by taking the main axis as an axle center, and the second rocker arm end drives the swing arm to swing around the main axis; and the elastic part provides an elasticity for pressing the swing arm to the second rocker arm end, so the lift of the valve is continuously adjusted within a certain range through controlling the rotation angle of the eccentric control shaft.
Description
Technical field
The utility model relates to the engine air valve lift controlling mechanism, relates in particular to a kind ofly can regulate the engine air valve lift controlling mechanism of valve lift within the specific limits continuously.
Background technique
Conventional piston formula natural aspiration internal-combustion engine adopts valve actuating mechanism to control the air charge that enters cylinder usually.Yet the mechanical parameter of valve actuating mechanism determines that once design the characteristics of motion of valve is promptly fixing, can not row adjusting again in the motor actual motion.And the engine operation condition complexity, the air charge demand in the cylinder has bigger difference with the operating mode difference.Under the different running speeds of motor,, then may promote the air charge in the cylinder as being optimized to the lift of valve.With the operating mode difference greatly different petrol engine is arranged for the air charge demand in the cylinder, if can control the duration of valve opening, then may replace closure, realize that control enters the effect of the air charge in the cylinder, thereby restriction loss is littler, and the complete machine oil consumption obviously reduces.
Therefore, exploitation lift and adjustable valve actuating mechanism of duration are the effective technology measures of the combustion engine powered and economic performance of jigger lifting piston formula, and technological approaches mainly contains mechanical type, hydraulic type and electromagnetic type etc.The mechanical variable air valve lift range mechanism with respect to other technological approaches, has big technical advantage because working stability is reliable, and cost is low at present.
The Chinese invention patent Shen Qing Publication has proposed a kind of mechanical continuous variable valve lift driving device CN101705851A number, and this mechanical continuous variable valve lift driving device comprises swing arm, rocking arm, Control Shaft, camshaft and return spring assembly.The return spring assembly acts on the arm body of swing arm, thereby swing arm and rocking arm are oppressed on camshaft.Swing arm is sleeved on the concentric shaft part of Control Shaft, and rocking arm is sleeved on the eccentric shaft part of Control Shaft, the arm body of swing arm is provided with arc convex surface, relatively the end face of the far-end of its swing fulcrum is for being used for and the interactional cam profile of valve spring assembly in swing arm, and it more than one section or one section is the arc surface (being the basic circle section) and at least one section function cambered surface (being active section) in the center of circle to swing fulcrum that this cam profile comprises.Rocking arm has the roller that is provided with at relative far-end of its swing fulcrum, and this roller contacts with arc convex surface in the swing arm, and the cam of camshaft contacts with the roller of the far-end of rocking arm.When Control Shaft rotates; the oscillation center axis of rocking arm can change; thereby; at a reciprocally swinging of swing arm in the cycle; the shared separately duration ratio of basic circle section in the cam profile of swing arm and active section changes; thus the time span of valve spring assembly axial motion and distance are changed, and promptly engine valve is opened the duration and lift changes.Yet, because the swing of camshaft actuated rocking arm drives the same side that the far-end of relative its swing fulcrum that all is arranged on rocking arm is swung in swing arm with rocking arm, the design at this transmission of movement position causes its transmission angle little, thereby cause whole mechanical efficiency low, driving torque is big, and, owing to need utilize the curvature of the basic circle section of cam profile directly to make the swing arm phase change, but these two function curved surfaces of the basic circle section of swing arm and active section are too approaching, therefore, on processing procedure, can only adopt the silk thread cutting process of being careful, cause efficient low, the manufacture cost height, mass production capabilities is poor.In addition, all are the same sides of far-end that are positioned at relative its swing fulcrum of swing arm because rocking arm acts on the arm body of swing arm with swing arm being used for of having and the interactional cam profile of valve spring assembly, the swing arm fatigue stress is big.
Therefore, be necessary to propose to improve to overcome existing above technical problem in the prior art.
The model utility content
The main technical problems to be solved in the utility model provides a kind ofly can regulate the engine air valve lift controlling mechanism of valve lift within the specific limits continuously, further reduces cost, simultaneously the reliability of lifting gear.
For solving the problems of the technologies described above, the utility model provides a kind of engine air valve lift controlling mechanism, and it comprises:
The eccentricity control axle, it has the eccentric axis that main axis and formation are parallel to main axis, and described eccentricity control axle can externally be controlled down around main axis and rotates and be stabilized in a certain corner;
Rocking arm, its with described eccentric axis be the axle center be hinged on the described eccentricity control axle, described rocking arm has to first direction radially extended away from the first rocking arm end of described eccentric axis with to the radially extended second rocking arm end away from described eccentric axis of second direction, and described first direction is different with described second direction;
Camshaft, it acts on the described first rocking arm end, swings around described eccentric axis thereby drive described rocking arm;
Swing arm, its with described main axis be the axle center be hinged on the described eccentricity control axle, the described second rocking arm end drives described swing arm and swings around described main axis; And
Elastic component, it provides elastic force to the described second rocking arm end is pressed in described swing arm.
In a kind of preferred embodiment, described first direction is opposite with described second direction.
Preferably, it is the eccentric axis cylndrical surface of axis that described eccentricity control axle has with described eccentric axis; rocking arm has first center hole; be hinged on by described first center hole on the eccentric axis cylndrical surface of eccentricity control axle, is provided with the rocking arm roller bearing between described first center hole and described eccentric axis cylndrical surface.
Preferably, the described first rocking arm end is provided with roller, described roller contacts with described camshaft, the described second rocking arm end has the projection that protrudes out to parallel described eccentric axis direction, described swing arm have to third direction radially extended away from the first swing arm end of described main axis and to the four directions to the radially extended second swing arm end away from described main axis, described third direction and described four directions be to different, described projection and the described first swing arm end in contact.
In a kind of embodiment, the described second swing arm end has the function surface of the lift of control valve assembly with the corner variation of described swing arm.
Preferably, it is the main axis cylndrical surface in axle center that described eccentricity control axle has with described main axis, described swing arm has second center hole, described second center hole is hinged on the described main axis cylndrical surface, between described second center hole and described main axis cylndrical surface the swing arm roller bearing is set.
Preferably, described main axis and described elastic component are installed regularly with respect to motor.
Preferably, described engine air valve lift controlling mechanism comprises two swing arms, and the relative both sides of the described second rocking arm end protrude out a projection to parallel described eccentric axis direction respectively, the first swing arm end in contact of each projection and a described swing arm.
Preferably, described camshaft is driven by engine timing system, and the main axis of described eccentricity control axle is fixed with respect to the engine cylinder cap assembly.
In preferred embodiment, described valve assembly be the tappet formula or rocking arm type, the function surface that the second swing arm end of described two swing arms has is identical or different.
Engine air valve lift controlling mechanism of the present utility model is to serve as lever with rocking arm, the first rocking arm end of camshaft actuated rocking arm, and the second rocking arm end that utilizes rocking arm drives swing arm, make that the driving direction of camshaft actuated rocking arm is opposite with the driving direction that rocking arm drives swing arm, promote the lever middle part by the eccentricity control axle, the phase place of swing arm is changed, thereby realize regulating continuously within the specific limits valve lift.Engine air valve lift controlling mechanism of the present utility model is by optimizing the contact angle at its each transmission of movement position, pressure angle greatly reduces, transmission efficiency improves, realize that valve lift further reduces cost on the basis of adjusting within the specific limits continuously, the rigidity and the reliability of while lifting gear are with the working speed scope of extension mechanism.
By the detailed description below with reference to accompanying drawing, it is obvious that others of the present utility model and feature become.But should be known in only the purpose design of this accompanying drawing, rather than as the qualification of scope of the present utility model, this is because it should be with reference to additional claim for explaining.Should also be appreciated that, unless otherwise noted, the unnecessary accompanying drawing of drawing to scale, they only try hard to illustrate conceptually structure described herein and flow process.
Description of drawings
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, wherein:
Fig. 1 is the stereogram of the engine air valve lift controlling mechanism of a kind of mode of execution of the utility model.
Fig. 2 is the three-dimensional exploded view of engine air valve lift controlling mechanism shown in Figure 1.
Fig. 3 is the schematic representation of eccentricity control axle of the present utility model, wherein, (a) is the end view of eccentricity control axle; (b) be the schematic perspective view of eccentricity control axle.
Fig. 4 is the fundamental diagram of engine air valve lift controlling mechanism of the present utility model, wherein, and (a) the little lift original state of expression; (b) expression high-lift original state; (c) during the little lift maximum lift of expression; When (d) representing the high-lift maximum lift.
Fig. 5 is a valve lift diagram of the present utility model.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
Fig. 1 is the stereogram of the engine air valve lift controlling mechanism of a kind of mode of execution of the utility model.Fig. 2 is the three-dimensional exploded view of engine air valve lift controlling mechanism shown in Figure 1.As depicted in figs. 1 and 2, engine air valve lift controlling mechanism 100 of the present utility model comprises eccentricity control axle 1, rocking arm 2, camshaft 3, swing arm 4, elastic component 5 and valve assembly 6.
Shown in Figure 3 in conjunction with reference, eccentricity control axle 1 has main axis 10 and forms the eccentric axis 11 that is parallel to main axis 10.The main axis 10 of eccentricity control axle 1 is supported on the engine cylinder cap assembly, eccentricity control axle 1 can externally control down around main axis 10 with any direction on demand angular velocity rotation and be stabilized in a certain corner.Eccentricity control axle 1 has with eccentric axis 11 and is the eccentric axis cylndrical surface 12 of axis and is the main axis cylndrical surface 13 in axle center with main axis 10.Eccentricity control axle 1 is the single-piece that a grinding is finished, thereby can reduce the precision machining face, and matching gap significantly reduces, and overall precision improves.
Rocking arm 2 have first center hole 20, from first center hole 20 to first direction radially extended away from the first rocking arm end 21 of eccentric axis 11 and from first center hole 20 to the radially extended second rocking arm end 22 of second direction away from eccentric axis 11, wherein, first direction is different with second direction.In the present embodiment, first direction and second direction are positioned at the relative both sides of first center hole 20, and first direction is opposite with second direction.Rocking arm 2 by first center hole 20 with eccentric axis 11 be the axle center be hinged on the eccentric axis cylndrical surface 12 of eccentricity control axle 1, and, between first center hole 20 and eccentric axis cylndrical surface 12, be provided with rocking arm roller bearing 7.The first rocking arm end 21 is provided with roller 23, and roller 23 contacts with camshaft 3.The roller 23 that the first rocking arm end 21 by rocking arm 2 is provided with contacts with camshaft 3, and under the driving of camshaft 3, rocking arm 2 can be around eccentric axis 11 reciprocally swingings of eccentricity control axle 1.The second rocking arm end 22 has the projection 24 that protrudes out to parallel eccentric axis 11 directions, and in the present embodiment, projection 24 protrudes out along the direction that is parallel to eccentric axis 11 from the relative both sides of the second rocking arm end 22 respectively.The projection 24 of the second rocking arm end 22 and an end in contact of swing arm 4, thus the second rocking arm end 22 of rocking arm 2 can drive swing arm 4 around main axis 10 swings.
Camshaft 3 is driven by engine timing system, and it acts on the first rocking arm end 21 of rocking arm 2, and contacts with the roller 23 of the first rocking arm end, 21 settings, thereby drives rocking arm 2 around eccentric axis 11 swings.
One end of elastic component 5 is fixed on the engine cylinder cap assembly, and the other end acts in the swing arm 4, to provide elastic force to the second rocking arm end 22 of rocking arm 2 is pressed in swing arm 4, thereby the restoring force that makes rocking arm 2 be close to camshaft 3 is provided.In the present embodiment, elastic component 5 is a return spring.
Fig. 4 is the fundamental diagram of engine air valve lift controlling mechanism of the present utility model, wherein, and (a) the little lift original state of expression; (b) expression high-lift original state; (c) during the little lift maximum lift of expression; When (d) representing the high-lift maximum lift.Fig. 5 is a valve lift diagram of the present utility model, and wherein, every curve is represented a phase place of eccentricity control axle 1.As shown in Figure 4 and Figure 5, engine air valve lift controlling mechanism 100 of the present utility model can be realized valve lift adjusting continuously within the specific limits by the corner of control eccentricity control axle 1.
Engine air valve lift controlling mechanism 100 of the present utility model is to serve as lever with rocking arm 2, camshaft 3 drives the first rocking arm end 21 of rocking arm 2, and the second rocking arm end 22 that utilizes rocking arm 2 drives swing arm 4, make that the driving direction of camshaft 3 driving rocking arms 2 is opposite with the driving direction that rocking arm 2 drives swing arms 4, promote the lever middle part by eccentricity control axle 1, the phase place of swing arm 4 is changed, thereby realize regulating continuously within the specific limits valve lift.Engine air valve lift controlling mechanism 100 of the present utility model is by optimizing the contact angle at its each transmission of movement position, pressure angle greatly reduces, transmission efficiency greatly improves, realizing that valve lift further reduces cost on the basis of adjusting within the specific limits continuously, the rigidity and the reliability of while lifting gear are with the working speed scope of extension mechanism.
Engine air valve lift controlling mechanism 100 of the present utility model is by setting up rocking arm roller bearing 7 and swing arm roller bearing 8, not only frictional loss descends, the lubricating requirement of engine air valve lift controlling mechanism 100 is reduced greatly, thereby do not need the machine oil of existing mechanism is carried out dilatation, but also very easily carry out efficient flowing water assembling in enormous quantities, overcome the problem of the batch assembling difficulty of prior art.
Engine air valve lift controlling mechanism 100 of the present utility model is by optimizing swing arm 4 designs; rocking arm 2 drives the first swing arm end 41 of swing arm 4; and utilize the second swing arm end 42 of swing arm 4 when swing arm 4 swings, to drive valve assembly 6; thus make the stress of swing arm 4 be distributed to the part two ends; improved fatigue strength, but also made swing arm 4 can adopt the high efficiency of milling processing technology cheaply to produce in batches.
Engine air valve lift controlling mechanism 100 of the present utility model reduces relatively owing to number of spare parts, thereby overall precision improves, and mechanism's rigidity strengthens, and has improved the ability that overcomes the high speed resiliently deformable, has promoted the potentiality of using the rotating speed upper limit.
Though the utility model with better embodiment openly as above; but it is not to be used for limiting the utility model; any those skilled in the art are not in breaking away from spirit and scope of the present utility model; can make possible change and modification, therefore protection domain of the present utility model should be as the criterion with the utility model claim institute restricted portion.
Claims (10)
1. engine air valve lift controlling mechanism is characterized in that it comprises:
The eccentricity control axle, it has the eccentric axis that main axis and formation are parallel to main axis, and described eccentricity control axle can externally be controlled down around main axis and rotates and be stabilized in a certain corner;
Rocking arm, its with described eccentric axis be the axle center be hinged on the described eccentricity control axle, described rocking arm has to first direction radially extended away from the first rocking arm end of described eccentric axis with to the radially extended second rocking arm end away from described eccentric axis of second direction, and described first direction is different with described second direction;
Camshaft, it acts on the described first rocking arm end, swings around described eccentric axis thereby drive described rocking arm;
Swing arm, its with described main axis be the axle center be hinged on the described eccentricity control axle, the described second rocking arm end drives described swing arm and swings around described main axis; And
Elastic component, it provides elastic force to the described second rocking arm end is pressed in described swing arm.
2. engine air valve lift controlling mechanism as claimed in claim 1, wherein, described first direction is opposite with described second direction.
3. engine air valve lift controlling mechanism as claimed in claim 2, wherein, it is the eccentric axis cylndrical surface of axis that described eccentricity control axle has with described eccentric axis; rocking arm has first center hole; be hinged on by described first center hole on the eccentric axis cylndrical surface of eccentricity control axle, is provided with the rocking arm roller bearing between described first center hole and described eccentric axis cylndrical surface.
4. engine air valve lift controlling mechanism as claimed in claim 1, wherein, the described first rocking arm end is provided with roller, described roller contacts with described camshaft, the described second rocking arm end has the projection that protrudes out to parallel described eccentric axis direction, described swing arm have to third direction radially extended away from the first swing arm end of described main axis and to the four directions to the radially extended second swing arm end away from described main axis, described third direction and described four directions be to different, described projection and the described first swing arm end in contact.
5. engine air valve lift controlling mechanism as claimed in claim 4, wherein, the described second swing arm end has the function surface of the lift of control valve assembly with the corner variation of described swing arm.
6. engine air valve lift controlling mechanism as claimed in claim 3, wherein, it is the main axis cylndrical surface in axle center that described eccentricity control axle has with described main axis, described swing arm has second center hole, described second center hole is hinged on the described main axis cylndrical surface, between described second center hole and described main axis cylndrical surface the swing arm roller bearing is set.
7. engine air valve lift controlling mechanism as claimed in claim 1, wherein, described main axis and described elastic component are installed regularly with respect to motor.
8. engine air valve lift controlling mechanism as claimed in claim 5, it comprises two swing arms, the relative both sides of the described second rocking arm end protrude out a projection to parallel described eccentric axis direction respectively, the first swing arm end in contact of each projection and a described swing arm.
9. engine air valve lift controlling mechanism as claimed in claim 1, wherein, described camshaft is driven by engine timing system, and the main axis of described eccentricity control axle is fixed with respect to the engine cylinder cap assembly.
10. engine air valve lift controlling mechanism as claimed in claim 8, wherein, described valve assembly be the tappet formula or rocking arm type, the function surface that the second swing arm end of described two swing arms has is identical or different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206139477U CN201891455U (en) | 2010-11-18 | 2010-11-18 | Lift adjusting mechanism of engine valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206139477U CN201891455U (en) | 2010-11-18 | 2010-11-18 | Lift adjusting mechanism of engine valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201891455U true CN201891455U (en) | 2011-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206139477U Expired - Lifetime CN201891455U (en) | 2010-11-18 | 2010-11-18 | Lift adjusting mechanism of engine valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201891455U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797526A (en) * | 2012-08-30 | 2012-11-28 | 三一重工股份有限公司 | Rocker arm, rocker arm assembly, engine and engineering machinery |
| CN107313827A (en) * | 2017-07-21 | 2017-11-03 | 华晨汽车集团控股有限公司 | A kind of new continuous variable valve lift mechanism |
| CN107956527A (en) * | 2016-10-18 | 2018-04-24 | 舍弗勒技术股份两合公司 | The intermediate push rod of variable valve driving apparatus |
-
2010
- 2010-11-18 CN CN2010206139477U patent/CN201891455U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797526A (en) * | 2012-08-30 | 2012-11-28 | 三一重工股份有限公司 | Rocker arm, rocker arm assembly, engine and engineering machinery |
| CN102797526B (en) * | 2012-08-30 | 2015-04-15 | 三一重工股份有限公司 | Rocker arm, rocker arm assembly, engine and engineering machinery |
| CN107956527A (en) * | 2016-10-18 | 2018-04-24 | 舍弗勒技术股份两合公司 | The intermediate push rod of variable valve driving apparatus |
| CN107956527B (en) * | 2016-10-18 | 2022-02-25 | 舍弗勒技术股份两合公司 | Intermediate push rod of variable valve driving device |
| CN107313827A (en) * | 2017-07-21 | 2017-11-03 | 华晨汽车集团控股有限公司 | A kind of new continuous variable valve lift mechanism |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110706 |
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| CX01 | Expiry of patent term |