CN103397922B - The actuating mechanism of engine and variable air valve lift apparatus thereof - Google Patents

Abstract

The invention discloses the actuating mechanism of a kind of engine and variable air valve lift apparatus thereof. Actuating mechanism comprises: hydraulic valve block, has the first and second chambers in hydraulic valve block; First piston, first piston is located at movably in the first chamber and the first chamber isolation is become to the first and second valve pockets; The second piston, the second piston is located at movably in the second chamber and the second chamber isolation is become to the third and fourth valve pocket, and wherein the 3rd valve pocket is identical with the first valve pocket shape and communicate with each other; The first drive rod, the first drive rod is connected with first piston; The second drive rod, the second drive rod is connected with the second piston; Fuel feeding oil return mechanism, fuel feeding oil return mechanism is communicated with the second valve pocket; Elasticity reset device, elasticity reset device is located in the 4th valve pocket; Elastic component, elastic component is suitable for being flexibly pressed between the first cam and the second cam. Actuating mechanism of the present invention is simple in structure, and control is reliable, precision is high.

Description

The actuating mechanism of engine and variable air valve lift apparatus thereof

Technical field

The present invention relates to automobile construction technical field, especially relate to causing of a kind of variable air valve lift apparatus for engineActuation mechanism.

Background technology

The valve actuating mechanism of conventional engines, its port timing generally part based on a certain narrow and small condition range of engine is excellentChange and determine, immobilize in the course of the work, and valve motion rule being determined by cam profile completely. But conventional gasoline is sent outMotivation cam profile is single, can not adjust air inflow according to engine load conditions. The valve of conventional engines valve actuating mechanismOperational factor is also changeless, definite operating point that depends on design of parameter.

Existing non-continuously variable valve stroke structure lift mode is single, can not realize most of operating mode of engine, fuel-economizingDeGrain. And existing continuously variable valve lift technology parts cost is high, complex structure, to each partsReliability requirement is high, and the difficulty of engine cylinder cover design is larger, and particularly the structure of actuating mechanism is more complicated, its adjustment processWayward, degree of regulation is poor.

Summary of the invention

The present invention is intended to solve at least to a certain extent one of above-mentioned technical problem of the prior art.

For this reason, one object of the present invention is to propose a kind of actuating mechanism of the variable air valve lift apparatus for engine,This actuating mechanism is simple in structure, control is convenient.

Another object of the present invention is to propose a kind of engine, and this engine comprises the above-mentioned variable gas for engineThe actuating mechanism of door lift device.

According to an aspect of the present invention, a kind of actuating mechanism of the variable air valve lift apparatus for engine has been proposed, instituteState variable air valve lift apparatus and comprise camshaft mechanism, described camshaft mechanism comprises camshaft, the first cam and the second cam,Described actuating mechanism comprises: hydraulic valve block, has the first chamber and the second chamber in described hydraulic valve block; First piston, instituteState that first piston is located in described the first chamber movably and will described the first chamber isolation become the first valve pocket independent of each other withThe second valve pocket; The second piston, described the second piston is located in described the second chamber and by described the second chamber isolation movablyBecome the 3rd valve pocket independent of each other and the 4th valve pocket, wherein said the 3rd valve pocket is identical with described the first valve pocket shape and connect each otherLogical, and be full of liquid in described the 3rd valve pocket and described the first valve pocket; The first drive rod, described the first drive rod with described inFirst piston is connected and moves with described first piston, on described the first drive rod, is provided with the first shift fork; The second drive rod,Described the second drive rod is connected with described the second piston and moves with described the second piston, is provided with on described the second drive rodTwo shift forks; Fuel feeding oil return mechanism, described fuel feeding oil return mechanism is communicated with described the second valve pocket; And elasticity reset device, instituteStating elasticity reset device is located in described the 4th valve pocket and is suitable for flexibly compressing described the second piston; And elastic component, described inElastic component is suitable for being flexibly pressed between described the first cam and described the second cam.

Can be used in variable air valve lift apparatus first in driving cam axis mechanism according to the actuating mechanism of the embodiment of the present inventionCam and the second cam action, realize the continuous variable of valve stroke, simple in structure, compact, facilitates the integrated cylinder that is arranged inIn lid, and this actuating mechanism can be arranged on the residing height of camshaft, can additionally not increase the height of cylinder head. AndAnd this actuating mechanism adopts hydraulic control, thereby make that driving process is more reliable and precision is high.

In addition, according to the actuating mechanism of the variable air valve lift apparatus for engine of the present invention, can also have attached as followsAdd technical characterictic:

According to one embodiment of present invention, described hydraulic valve block hollow and inside are provided with spacing block, and described spacing block is by instituteThe inner space of stating hydraulic valve block is isolated into described the first chamber and the second chamber, the free-ended end face of described spacing block with,The internal face of the sidewall that free end end face described hydraulic valve block and this spacing block is relative is spaced apart, to be communicated with described firstValve pocket and described the 3rd valve pocket.

According to one embodiment of present invention,

One end of described the first drive rod inwardly extend in described the second valve pocket to be fixed on from a sidewall of described the second valve pocketOn one side of described first piston;

One end of described the second drive rod inwardly extend in described the 4th valve pocket to be fixed on from a sidewall of described the 4th valve pocketOn one side of described the second piston.

According to one embodiment of present invention, described elasticity reset device is spring, and described spring housing is at described the second drive rodStretch in the part in described the 4th valve pocket.

According to one embodiment of present invention, on described hydraulic valve block, be provided with the leakage hole being communicated with described the 4th valve pocket.

According to one embodiment of present invention, each in described first piston and described the second piston is all formed as cuboidShape or the square bodily form.

According to one embodiment of present invention, described fuel feeding oil return mechanism comprises:

Engine oil pressure chamber, is connected by being communicated with oil duct between described engine oil pressure chamber and described the second valve pocket; And

Be used to open or close the control valve of the entrance point in described engine oil pressure chamber.

According to one embodiment of present invention, described actuating mechanism also comprises for measuring described engine oil pressure intraluminal fluid force feed and pressingThe pressure tester of power.

According to one embodiment of present invention, described actuating mechanism also comprises clutch shaft bearing, and described clutch shaft bearing is suitable for being enclosed within instituteState on camshaft and lay respectively at described the first cam and described the first shift fork and described the second cam and described the second shift fork itBetween.

According to a further aspect in the invention, proposed a kind of engine, this engine comprises above-mentioned variable for engineThe actuating mechanism of valve lift apparatus.

Brief description of the drawings

Fig. 1 is that variable air valve lift apparatus is assemblied in the schematic diagram in cylinder head according to an embodiment of the invention;

Fig. 2 is the top view of variable air valve lift apparatus according to an embodiment of the invention;

Fig. 3-Fig. 4 is the signal of variable air valve lift apparatus in the time that valve stroke is zero lift according to an embodiment of the inventionFigure;

Fig. 5-Fig. 6 is the signal of variable air valve lift apparatus in the time that valve stroke is little lift according to an embodiment of the inventionFigure;

Fig. 7-Fig. 8 is the signal of variable air valve lift apparatus in the time that valve stroke is high-lift according to an embodiment of the inventionFigure;

Fig. 9 is the schematic diagram of actuating mechanism and camshaft mechanism according to an embodiment of the invention;

Figure 10 is the schematic diagram of actuating mechanism and camshaft mechanism in accordance with another embodiment of the present invention;

Figure 11 is the actuating mechanism of another embodiment and the partial schematic diagram of camshaft mechanism according to the present invention;

Figure 12 is the schematic diagram of actuating mechanism, wherein not shown fuel feeding oil return mechanism according to an embodiment of the invention;

Figure 13 is the partial enlarged drawing of the 4th valve pocket of actuating mechanism according to an embodiment of the invention;

Figure 14 is the schematic diagram of the fuel feeding oil return mechanism of actuating mechanism according to an embodiment of the invention;

Figure 15 is the cutaway view of the hydraulic valve block of actuating mechanism according to an embodiment of the invention;

Figure 16 is the front view of the hydraulic valve block of actuating mechanism according to an embodiment of the invention;

Figure 17 is the front view of platen according to an embodiment of the invention;

Figure 18 is the cutaway view of platen according to an embodiment of the invention;

Figure 19 is the cutaway view of camshaft mechanism according to an embodiment of the invention;

Figure 20 is the stereogram of the first cam or the second cam according to an embodiment of the invention;

Figure 21 is the cutaway view of the first cam or the second cam according to an embodiment of the invention;

Figure 22 is the front view of rocker arm body according to an embodiment of the invention;

Figure 23 is the side view of rocker arm body according to an embodiment of the invention;

Figure 24 is the cutaway view of roller according to an embodiment of the invention.

Detailed description of the invention

Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, wherein identical from start to finishOr similarly label represents same or similar element or has the element of identical or similar functions. Below by retouching with reference to accompanying drawingThe embodiment stating is exemplary, is intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.

In description of the invention, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " length ", " width "," thickness ", " on ", D score, 'fornt', 'back', " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ",Orientation or position relationship that " outward ", " clockwise ", " counterclockwise " etc. indicate are based on orientation shown in the drawings or position relationship,Be only the present invention for convenience of description and simplified characterization, instead of device or the element of instruction or hint indication must have specificOrientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.

In addition, term " first ", " second " be only for describing object, and can not be interpreted as instruction or hint relative importanceOr the implicit quantity that indicates indicated technical characterictic. Thus, the feature that is limited with " first ", " second " can be expressedOr impliedly comprise one or more these features. In description of the invention, the implication of " multiple " is two or twoAbove, unless otherwise expressly limited specifically.

In the present invention, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " fixing "Should be interpreted broadly Deng term, for example, can be to be fixedly connected with, and can be also to removably connect, or integral; Can beMechanical connection can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, can be twoThe interaction relationship of the connection of individual element internal or two elements. For the ordinary skill in the art, Ke YigenUnderstand above-mentioned term concrete meaning in the present invention according to concrete condition.

In the present invention, unless otherwise clearly defined and limited, First Characteristic Second Characteristic it " on " or D scoreCan comprise that the first and second features directly contact, also can comprise that the first and second features are not directly contacts but logicalCross the other feature contact between them. And, First Characteristic Second Characteristic " on ", " top " and " onFace " comprise First Characteristic directly over Second Characteristic and oblique upper, or only represent that First Characteristic level height is higher thanTwo features. First Characteristic Second Characteristic " under ", " below " and " below " comprise that First Characteristic is the second spyUnder levying and tiltedly, or only represent that First Characteristic level height is less than Second Characteristic.

Engine body group is the support of engine, is the matrix of toggle, valve actuating mechanism and the assembling of each system.Body group is mainly made up of cylinder block, cylinder head, cylinder head gasket and oil sump etc., and oil sump is generally located at cylinder blockBottom, cylinder head is located at the top of cylinder block, and cylinder head gasket is located between the end face of cylinder block and the bottom surface of cylinder head, usesIn the gap sealing between the two.

Cylinder head forms combustion chamber together with cylinder with top land, the top of combustion chamber has air inlet and exhaust outlet, valveMechanism is located in cylinder head and sealing air inlet and exhaust outlet. For existing general engine, adopt two to enter two moreThe valve mechanism going out, minority also has the valve mechanism that adopts one-in-and-one-out or three to enter scene 2.

For same engine, generally all there is multiple different operating mode, for example low speed small load condition, high speed load greatlyOperating modes etc., when engine is under low speed small load condition, the power of engine and the output of moment of torsion are relatively low, therefore enterThe air entering in combustion chamber can be relatively less, and at engine under high speed high load working condition, the power of engine and moment of torsionOutput relatively higher, therefore need more air to enter in combustion chamber and more oil inflame.

Variable air valve lift apparatus of the present invention can be realized the continuous variable of particularly air inlet side of valve stroke valve stroke, fromAnd can carry out intelligent adjusting valve stroke according to the residing different operating modes of engine, ensure that air and the fuel oil in combustion chamber fully firesBurn, improve power performance and the fuel economy of engine.

Describe in detail according to the variable air valve lift apparatus for engine of the embodiment of the present invention below with reference to Fig. 1-Figure 241000。

According to an embodiment of the invention variable air valve lift apparatus 1000 comprise valve mechanism 100, camshaft mechanism 200,Rocker arm body 300 and actuating mechanism 400.

Wherein, as shown in Fig. 3-Fig. 8, valve mechanism 100 has been prior art, and is those of ordinary skill in the art instituteKnow, for example valve mechanism 100 can comprise the gentle door of valve head bar portion, and valve mechanism 100 can be along valve mechanism 100Center line in valve guide bushing, move up and down to open or close air inlet or the exhaust outlet of combustion chamber, can be with existing for theseThere is technology to adopt the part of identical or close design, be not described in detail here.

Camshaft mechanism 200 is located at the top of valve mechanism 100, and camshaft mechanism 200 comprises camshaft 201, the first cam203 and second cam 207, shown in Fig. 2, the first cam 203 is set on camshaft 201 and with camshaft 201 and turnsMove and can move axially, that is to say, the first cam 203 can be synchronous around the central axis of camshaft 201 with camshaft 201Rotation, and the first cam 203 relative camshaft 201 in the axial direction of camshaft 201 is removable. For example, camshaft 201Can be splined shaft or the singly-bound axle with keyway, the first cam 203 has the keyway axially coordinating with camshaft 201. ,Coordinate by the keyway between the first cam 203 and camshaft 201, can realize the first cam 203 with camshaft on the one hand201 synchronous rotaries, can also realize on the other hand the relative camshaft 201 of the first cam 203 and move axially.

Similarly, the second cam 207 is set on camshaft 201 and with camshaft 201 and rotates and can move axially, alsoBe to say, the second cam 207 can synchronous rotary around the central axis of camshaft 201 with camshaft 201, and the second cam 207In the axial direction of camshaft 201, camshaft 201 is removable relatively. For example, camshaft 201 can be splined shaft or with keywaySingly-bound axle, the keyway that the second cam 207 has and camshaft 201 axially coordinates. , by the second cam 207 and protrudingKeyway between wheel shaft 201 coordinates, and can realize the second cam 207 with camshaft 201 synchronous rotaries, the opposing party on the one handFace can also be realized the relative camshaft 201 of the second cam 207 and move axially.

Shown in Fig. 2-Fig. 8, the first cam 203 and the second cam 207 are contiguous to be arranged with formation pair of cams group, and this is one years oldCam set is used for driving rocker arm body 300. Wherein, the preferably mirror image of shape of the first cam 203 and the second cam 207Symmetrical, and after the first cam 203, the second cam 207 assembles with camshaft 201, the first cam 203 andThe second cam 207 is also mirror image symmetry, in other words, by the first cam 203 reverse after 180 ° will with the second cam 207Overlap completely.

Shown in Fig. 2, Figure 19 and Figure 21, on the first cam 203, be configured with the first drive surface 205, the second cams 207On be configured with the second drive surface 209, the first drive surface 205 and the second drive surface 209 in the axial direction of camshaft 201 each otherRelatively,, the first drive surface 205 and the second drive surface 209 are also mirror image symmetries. The first drive surface 205 and second drivesFace 209 is all configured to be suitable for obtaining required valve stroke, because the first drive surface 205 and the second drive surface 209 are also mirrorsPicture symmetric relation, therefore here only taking the first drive surface 205 as example explanation.

For example, this first drive surface 205 can precompute this first drive surface 205 according to the different operating modes of engineLine style, particularly, the line style of this first drive surface 205 can draw by the anti-mode that pushes away, as according to valve mechanism 100 differencesThe valve lift curve that valve stroke should have and consider roller 301 and the first cam 203(and the second cam 207)The position contacting obtains corresponding the first drive surface 205(and the second drive surface 209) shape line, then by numerous cam-shaped lineScan and obtain, this is all that appearance is intelligible for the ordinary skill in the art.

Like this, when this engine is during with the running of a certain operating mode, in the first drive surface 205, have be suitable for this operating mode under be suitable for mostDrive the line style part of roller 301 of rocker arm body 300, thus the roller 301 by changing rocker arm body 300 with thisThe contact cooperation position of one drive surface 205, thus make the lift amount of valve mechanism 100 suitable, ensure to enter in combustion chamberSufficient and suitable air capacity, to fully burn with fuel oil, improves power output and the fuel economy of engine.

More specifically, as shown in Figure 19 and Figure 20, the first drive surface 205 and the second drive surface 209 all can comprise inclined plane partDivide and planar section, in the time that roller 301 coordinates with chamfered portion, the lift amount of valve mechanism 100 is less, particularly,Roller 301 contacts the position coordinating the closer to planar section with inclined-plane, lift amount is larger, and roller 301 contacts cooperation with inclined-planePosition and planar section far away, lift amount is less to such an extent as to lift amount is zero, roller 301 contact with planar section coordinate time,Lift amount maximum. Certainly, be understandable that, the present invention is not limited to this, in other embodiment of the present invention, theOne drive surface 205 and the second drive surface 209 also can be inclined-plane or arcwall face or other profile, as long as the first drive surface 205Can be configured to be suitable for obtaining required valve stroke with the second drive surface 209, this is for the ordinary skill people of this areaMember is that appearance is intelligible.

As shown in Fig. 3-Fig. 8, rocker arm body 300 is located between valve mechanism 100 and camshaft mechanism 200, rocker arm body300 comprise roller 301, and roller 301 is suitable for respectively coordinating with the first drive surface 205 and the second drive surface 209. , protrudingWhen wheel shaft 201 rotates, the first drive surface 205 and the second drive surface 209 can press down the non-zero lift situation of roller 301(), fromAnd make rocker arm body 300 taking fulcrum structure 341 as fulcrum entirety to lower swing with drive valve mechanism 100 around valve mechanism 100Central axis back and forth move up and down.

As shown in Figure 2, actuating mechanism 400 is for driving the first cam 203 and the second cam 207 are synchronized with the movement in opposite directions or carry on the backTo being synchronized with the movement to change the contact cooperation position of roller 301 with the first drive surface 205 and the second drive surface 209, with continuouslyThe lift that regulates changeably valve mechanism 100, that is to say, actuating mechanism 400 drives the first cam 203 and the second cam207 mirror movementses, thus the cooperation position that contacts of roller 301 and the first drive surface 205 and the second drive surface 209 changed,Thereby realize the object that regulates valve lift amount.

The understanding of value, above-mentioned " the first cam 203 and the second cam 207 are synchronized with the movement in opposite directions " can be understood as: theFortune when one cam 203 and the motion close to each other of the second cam 207 and the first cam 203 and the second cam 207 close motionMoving velocity magnitude equates. Above-mentioned " the first cam 203 and the second cam 207 are synchronized with the movement dorsad " can be understood as: firstCam 203 and the second cam 207 move and the motion during away from motion of the first cam 203 and the second cam 207 away from each otherVelocity magnitude equates. In brief, the first cam 203 and the second cam 207 mirror movementses.

Like this, due to the first cam 203 and the second cam 207 mirror movementses, therefore roller 301 and the first drive surface 205And roller 301 is that (mirror image) is relative with the contact cooperation position of the second drive surface 209, that is to say, suppose nowRemove any one in the first cam 203 and the second cam 207, only by one of them driven roller 301, valve machineThe lift amount of structure 100 and two drive surface simultaneously when driven roller 301 lift amount of valve mechanism 100 be the same, this is rightIn those of ordinary skill in the art, be obviously that appearance is intelligible.

In addition, it should be noted that in description of the invention, as there is no specified otherwise, preferably, with valve mechanism 100For air inlet side valve mechanism 100 is example, as shown in reference to Fig. 1, in this embodiment, valve mechanism 100 is air inlet sideValve mechanism 100, the valve mechanism 100 of exhaust side does not arrange lift range variable according to an embodiment of the inventionDevice 1000. Certainly, be understandable that, this valve mechanism 100 also can be exhaust valve, i.e. this variable air valve lift apparatus1000 also can be applicable to regulate the lift of exhaust valve.

According to the variable air valve lift apparatus 1000 of the embodiment of the present invention, solve well engine at high speed high load working conditionWith the requirement of low speed small load condition to distribution, reduce pumping loss, also realized the continuous variable of valve stroke simultaneously, largeImprove greatly the power performance and the economy performance of engine, reduced the discharge of the pernicious gases such as HC, CO, CO2, NOx.

Describe actuating mechanism 400 according to some embodiments of the invention in detail below with reference to Fig. 1-Figure 24.

Actuating mechanism 400 can comprise hydraulic valve block 401, first piston 411, the second work according to an embodiment of the inventionPlug 431, the first drive rod 412, the second drive rod 432, fuel feeding oil return mechanism, elasticity reset device 441 and elastic component 421.

As shown in figure 15, have the first chamber 402 and the second chamber 403 in hydraulic valve block 401, hydraulic valve block 401 canRemovably be located in cylinder head by bolt, certainly also can be directly welded on cylinder cap. As shown in Fig. 9-Figure 10,12,First piston 411 is located at movably in the first chamber 402 and the first chamber 402 is isolated into the first valve pocket independent of each other404 and second valve pocket 405, that is to say, the first valve pocket 404 and the second valve pocket 405 are disconnected mutually independently of one another,Hydraulic oil in for example hydraulic oil of liquid and the second valve pocket 405 in one valve pocket 404 can not pass through first piston 411 and firstThe internal face of chamber 402 circulates.

, thus first piston 411 is engaged in hermetically in the first chamber 402 this first chamber 402 is isolated into the first valveChamber 404 and the second valve pocket 405, first piston 411 can be in the interior movement of the first chamber 402, therefore the first valve pocket 404 andThe volume of two valve pockets 405 is variable, for example, with reference to shown in Fig. 9, Figure 10 and Figure 12, at first piston 411 to moving to leftWhen moving, the compressed and smaller volume of the first valve pocket 404, the volume phase strain of the second valve pocket 405 is large.

Equally, the second piston 431 is located at movably in the second chamber 403 and the second chamber 403 is isolated into independently of one anotherThe 3rd valve pocket 406 and the 4th valve pocket 407, that is to say, the 3rd valve pocket 406 and the 4th valve pocket 407 be independent of one another mutuallyDisconnected, the hydraulic oil in for example hydraulic oil of liquid and the 4th valve pocket 407 in the 3rd valve pocket 406 can not lived by secondThe internal face of plug 431 and the second chamber 403 circulates.

, thus the second piston 431 is engaged in hermetically in the second chamber 403 this second chamber 403 is isolated into the 3rd valveChamber 406 and the 4th valve pocket 407, the second pistons 431 can be in the interior movements of the second chamber 403, therefore the 3rd valve pocket 406 andThe volume of four valve pockets 407 is variable, for example, with reference to shown in Fig. 9, Figure 10 and Figure 12, at the second piston 431 to moving to leftWhen moving, the compressed and smaller volume of the 3rd valve pocket 406, the volume phase strain of the 4th valve pocket 407 is large.

Wherein, the 3rd valve pocket 406 is identical with the first valve pocket 404 shapes and communicate with each other, in other words, the 3rd valve pocket 406 withThe length of the first valve pocket 404 is identical, shape of cross section is identical and sectional area equates, that is to say, the 3rd valve pocket 406 HesWhile being full of liquid as hydraulic oil in the first valve pocket 404, the volume of this liquid equates. With reference to Fig. 9, Figure 10 and Figure 12Shown in, the first valve pocket 404 and the 3rd valve pocket 406 be arranged in parallel and one end of the first valve pocket 404 and the 3rd valve pocket 406 (asLeft end in Fig. 9, Figure 10 and Figure 12) be communicated with.

The 3rd valve pocket 406 and the first valve pocket 404 communicate with each other, and the liquid of these two valve pockets can flow mutually as hydraulic oil like thisMoving. Shown in Fig. 9 and Figure 10, in the 3rd valve pocket 406 and the first valve pocket 404, be full of liquid, preferably, this liquid canTo be hydraulic oil.

The first drive rod 412 is connected with first piston 411 and moves with first piston 411, for example the first drive rod 412One side of one end (Fig. 9 with left end) in Figure 10 and first piston 411 (Fig. 9 with right flank) in Figure 10 is connected,On the first drive rod 412, be provided with the first shift fork 413, the first shift forks 413 and be suitable for the clutch shaft bearing that will mention by below221 pushing the first cams 203 are to the direction motion near the second cam 207. As shown in Figure 9 and Figure 10, the first shift fork 413Can be connected to the other end (right-hand member in Fig. 9 and Figure 10) of the first drive rod 412, the first shift fork 413 and the first drive rod412 can be one-body molded.

The second drive rod 432 is connected with the second piston 431 and moves with the second piston 431, for example the second drive rod 432One side of one end (Fig. 9 with left end) in Figure 10 and the second piston 431 (Fig. 9 with right flank) in Figure 10 is connected,On the second drive rod 432, be provided with the second shift fork 433, the second shift forks 433 and be suitable for the clutch shaft bearing that will mention by below221 pushing the second cams 207 are to the direction motion near the first cam 203. As shown in Figure 9 and Figure 10, the second shift fork 433Can be connected to the other end (right-hand member in Fig. 9 and Figure 10) of the second drive rod 432, the second shift fork 433 and the second drive rod432 can be one-body molded.

Shown in Fig. 9-Figure 11, the first shift fork 413 and the second shift fork 433 lay respectively at the first cam 203 and the second cam207 outside, the first shift fork 413 and the second shift fork 433 be respectively used to promote the first cam 203 and the second cam 207 toNear direction synchronizing moving each other. Shown in Fig. 9 and Figure 10, the length of the first drive rod 412 and the second drive rod 432Degree not etc., can not avoided interfering between the first shift fork 413 and the second shift fork 433 like this.

Fuel feeding oil return mechanism (can comprise control valve 461 and engine oil pressure chamber 465) is communicated with the second valve pocket 405, and fuel feeding returnsOil machine structure is for hydraulic oil oily to the interior output hydraulic pressure of the second valve pocket 405 or that reception refluxes from the second valve pocket 405. Elasticity is multiplePosition device 441 is located in the 4th valve pocket 407 and is suitable for flexibly compressing the second piston 431, and elastic component 421 is suitable for flexiblyBe pressed between the first cam 203 and the second cam 207. Elastic component 421 leans at the first cam 203 and the second cam 207Compressed when nearly motion, deposit elastic potential energy, elastic component in the time that the first cam 203 and the second cam 207 need to deviate from motion421 can discharge the elastic potential energy of deposit, drive the first cam 203 and the second cam 207 to deviate from motion.

In the time of initial equilibrium conditions, the first valve pocket 404, the second valve pocket 405 and the 3rd valve pocket 406 internal pressures and elastic reset dressPut 441 elastic force, elastic force formation balance, now first piston 411 and second piston 431 stress balances of elastic component 421And relative position is constant, for example, with reference to shown in Fig. 9 and Figure 10, the first piston 411 in Fig. 9 and Figure 10 and the second pistonIt is initial rest position that 431 position can be understood as, and still, is appreciated that and the present invention includes but be not limited to this.

In the time need to regulating the lift amount of valve mechanism 100, the first cam 203 and the second cam 207 are made mirror movements,Synchronous relative motion or synchronously motion dorsad, in the time of synchronous relative motion, promoted by the first shift fork 413 and the second shift fork 433The first cam 203 and the second cam 207 are close to each other, and in the time synchronously moving dorsad, elastic component 421 promotes the first cam 203Deviate from motion with the second cam 207.

Particularly, in the time of the first cam 203 and the second cam 207 close motion, fuel feeding oil return mechanism is to the second valve pocket 405Interior output hydraulic pressure oil, along with constantly entering of hydraulic oil, the pressure in the second valve pocket 405 increases gradually, thereby destroys previouslyBalance, make the direction motion of first piston 411 to compression the first valve pocket 404, for example, in the example of Fig. 9 and Figure 10,First piston 411 is to left movement.

After the first valve pocket 404 is compressed, the liquid in the first valve pocket 404 can pass through the first valve pocket 404 and the 3rd valve pocket 406Connected component flow to the 3rd valve pocket 406, the volumetric expansion of the 3rd valve pocket 406 thus, thus promote the second piston 431 toThe direction motion contrary with first piston 411, for example, in the example of Fig. 9 and Figure 10, the second piston 431 moves right.

Because the first valve pocket 404 is identical with the 3rd valve pocket 406 shapes, therefore the first valve pocket 404 reduces due to compressedVolume with the 3rd valve pocket 406 because the volume that expansion increases is identical, the fortune of first piston 411 and the second piston 431 thusMoving opposite direction and move distance equate.

Taking the actuating mechanism 400 shown in Fig. 9 and Figure 10 as example, be transported to the second valve pocket at hydraulic oil from fuel feeding oil return mechanism405 when interior, and first piston 411 left move distance is L, and it is also L that the second piston 431 moves right distance, the second piston431 move right meeting elasticity of compression resetting means 441, thereby make 441 accumulation of energys of contracting elasticity reset device. At fuel feeding oil return mechanismWhile stopping to the second valve pocket 405 interior supply hydraulic fluid, in the first valve pocket 404, the second valve pocket 405 and the 3rd valve pocket 406The elastic force of pressure and elasticity reset device 441, the elastic force of elastic component 421 will reach balance again.

In this process, first piston 411 moves to left drive the first drive rod 412 and the first shift fork 413 is moved to the left,The first shift fork 413 is moved to the left promotion the first cam 203, and same, the second piston 431 moves to right drive the second drive rod432 and second shift fork 433 move right, the second shift fork 433 moves right promotion the second cam 207, first is protrudingWheel 203 and the second cam 207 synchronous relative motions. The first cam 203 and the second cam 207 near motion process in,Elastic component 421 is by compressed, thus deposit elastic potential energy.

And in the time that the first cam 203 and the second cam 207 deviate from motion, the part hydraulic oil in the second valve pocket 405 can refluxTo fuel feeding oil return mechanism, thereby the oil pressure in the second valve pocket 405 reduces, and balance is before destroyed, first piston 411Counter motion (with the direction of motion is contrary before), first valve pocket 404 volumes increase, thereby the liquid in the 3rd valve pocket 406 fromConnectivity part flows in the first valve pocket 404 again, thereby the volume of the 3rd valve pocket 406 reduces, and then the second piston 431 is at bulletCounter motion (with the direction of motion is contrary before) under the elastic force effect of property resetting means 441.

For example, taking the actuating mechanism 400 shown in Fig. 9 and Figure 10 as example, return from the interior part of the second valve pocket 405 at hydraulic oilWhile flowing to fuel feeding oil return mechanism, first piston 411 will move right, and the second piston 431 is to left movement, and the position of the twoMove equal and opposite in direction, opposite direction, until pressure and the bullet in the first valve pocket 404, the second valve pocket 405 and the 3rd valve pocket 406Property resetting means 441 elastic force, the elastic force of elastic component 421 will again reach new balance, first piston 411 and second is livedFilling in 431 no longer moves. In this process, because the first shift fork 413 and the second shift fork 433 deviate from motion, thereby at bulletUnder the 421 elastic force effects of property part, promotion the first cam 203 and the second cam 207 are synchronously deviated from motion by elastic component 421.

Can be used in variable air valve lift apparatus driving cam axis mechanism 200 according to the actuating mechanism 400 of the embodiment of the present inventionIn the first cam 203 and the second cam 207 move, realize the continuous variable of valve stroke, simple in structure, compact, sideJust integrated being arranged in cylinder head, and this actuating mechanism 400 can be arranged on the residing height of camshaft, can be not extraIncrease the height of cylinder head. And this actuating mechanism 400 adopts hydraulic control, thereby make driving process more reliable and smartSpend high.

According to one embodiment of present invention, as shown in figure 15, hydraulic valve block 401 hollows and inside are provided with spacing block 408,The inner space of hydraulic valve block 401 is isolated into the first chamber 402 and the second chamber 403, spacing block 408 by spacing block 408Free-ended end face (left side in Figure 15) with, hydraulic valve block 401 relative with free end end face spacing block 408The internal face of a sidewall spaced apart, in other words, the free-ended end face of spacing block 408 and the hydraulic valve block 401 relative with itThe internal face of a sidewall spaced apart, thereby form communicating passage to be communicated with the first valve pocket 404 and the 3rd valve pocket 406.

Shown in Fig. 9 and Figure 10, one end of the first drive rod 412 inwardly extend into from a sidewall of the second valve pocket 405Two valve pockets 405 are interior to be fixed on a side of first piston 411. For example, shown in Fig. 9 and Figure 10, first drivesThe left end of bar 412 inwardly extend in the second valve pocket 405 from the right side wall of the second valve pocket 405, and this first drive rod 412Left end be connected with the right flank of first piston 411.

Equally, one end of the second drive rod 432 from a sidewall of the 4th valve pocket 407 inwardly extend in the 4th valve pocket 407 withBe fixed on a side of the second piston 431. For example, shown in Fig. 9 and Figure 10, the left end of the second drive rod 432 fromThe right side wall of the 4th valve pocket 407 inwardly extend in the 4th valve pocket 407, and the left end of this second drive rod 432 and secondThe right flank of piston 431 is connected.

Further, as shown in Figure 9 and Figure 10, elasticity reset device 441 springs, spring housing is stretched the second drive rod 432Enter in the part in the 4th valve pocket 407, such the second drive rod 432 can be realized location to spring, avoids spring at the 4th valveIn chamber 407, move freely, reverse, improve the stability of actuating mechanism 400.

Wherein, the junction of the second drive rod 432 and the second piston 431 is preferably placed at the center of the second piston 431,Spring housing can, better to second piston 431 application of forces, make the second piston 431 more stressed on the second drive rod 432 like thisAdd balance. Certainly, be understandable that, the present invention is not limited to this, at other embodiment of the present invention, and the 4th valve pocketIndependent spring stack also can be set in 407, and spring stack can be set directly on the internal face of the 4th valve pocket 407, certainly alsoCan be arranged on a side that is positioned at the 4th valve pocket 407 of the second piston 431, spring can be enclosed within on spring stack, fromAnd positioned by spring stack, avoid spring to move freely.

Preferably, shown in Figure 13 and Figure 16, on hydraulic valve block 401, be provided with the gas leakage being communicated with the 4th valve pocket 407Hole 462. By leakage hole 462 is set, in the time that the second piston 431 moves to the direction of compression the 4th valve pocket 407, can keep awayExempt from the 4th valve pocket 407 interior because sealing causes the air in the 4th valve pocket 407 compressed, can improve thus actuating mechanism400 operation precision, avoids the air in the 4th valve pocket 407 to be caused first piston 411 and the second piston by excessive compression431 drive difficulty. Leakage hole 462 can be one, and the shape of leakage hole 462 does not have particular/special requirement, and it can be offeredIn the bottom of the 4th valve pocket 407, can certainly be opened in the sidepiece of the 4th valve pocket 407.

Rotate and occur 203 points, the first shift fork 413 and the first cam around the first drive rod 412 for fear of the first shift fork 413From situation, preferably, the first shift fork 413 should be limited rotary freedom, the first shift fork 413 drives with first onlyLever 412 moves axially and can not rotate together. In view of this, preferably, according to one embodiment of present invention, firstPiston 411 is cuboid or the square bodily form, and the inner peripheral surface of the first chamber 402 is suitable with first piston 411 outer peripheral facesThe shape of joining, take first piston 411 as example as square, and the cross section of the inner peripheral surface of the first chamber 402 is also square,First piston 411 not only can make the first valve pocket 404 and the second valve pocket 405 keep apart in the time of the interior slip of the first chamber 402 like this,And first chamber 402 can also limit the rotary freedom of first piston 411, avoid first piston 411 to rotate,And then limit the rotary freedom of the first drive rod 412 and the first shift fork 413.

Based on same reason, the second piston 431 is cuboid or the square bodily form, and the inner peripheral surface of the second chamber 403For with the shape of the outer peripheral face adaptation of the second piston 431, taking the second piston 431 as square is as example, the second chamber 403The cross section of inner peripheral surface be also square, such the second piston 431 not only can make the 3rd in the time of the interior slip of the second chamber 403Valve pocket 406 and the 4th valve pocket 407 are kept apart, and the second chamber 403 can also be to the rotary freedom of the second piston 431Limit, avoid the second piston 431 to rotate, and then limited the rotation of the second drive rod 432 and the second shift fork 433The free degree.

Thus, realize the restriction to the first shift fork 413 and the second shift fork 433 rotary freedoms, avoided due to first groupFork 413 freely rotates with the second shift fork 433 and the generation of situation about separating with respective cams, and guarantee actuating mechanism 400 movesReliably.

Wherein, be understandable that, above-mentioned is only signal as the square bodily form as example taking first piston 411 and the second piston 431Property ground explanation, can not be interpreted as it is to a kind of restriction of the present invention.

But the present invention is not limited to this, in other embodiment of the present invention, actuating mechanism 400 also can arrange listOnly location division structure, for realizing the location to the first drive rod 412 and the second drive rod 432, prevents the first drive rod412 and second drive rod 432 freely rotate, thereby prevent that the first shift fork 413 and the second shift fork 433 from freely rotating.

For example, on the first drive rod 412 and the second drive rod 432, projection can be set, location division structure can be and projectionAdaptive strip groove, projection can be moved along the length direction of the first drive rod 412 or the second drive rod 432 in groove,But due to projection and the mating reaction of groove, can prevent that the first drive rod 412 and the second drive rod 432 from freely rotating.

According to a preferred embodiment of the present invention, as shown in Fig. 9-Figure 10, Figure 14, fuel feeding oil return mechanism comprises oil pressurePower chamber 465 and control valve 461, be connected by being communicated with oil duct 467 between engine oil pressure chamber 465 and the second valve pocket 405,Hydraulic oil in the second valve pocket 405 can enter in fuel feeding oil return mechanism by being communicated with oil duct 467, or fuel feeding oil return mechanismInterior hydraulic oil can enter in the second valve pocket 405 by this connection oil duct 467. Engine oil pressure chamber 465 has entrance point,External hydraulic pipeline can be communicated with entrance point, thereby outer liquid force feed can enter in engine oil pressure chamber 465 by this entrance point,Or the hydraulic oil in engine oil pressure chamber 465 can flow out by entrance point, control valve 461 can be located in engine oil pressure chamber 465And be positioned at entrance point place, control valve 461 is used to open or close engine oil pressure chamber 465, thus by engine oil pressure chamber 465 withExternal hydraulic pipeline connection or disconnection.

Preferably, according to one embodiment of present invention, control valve 461 can be two-position three way magnetic valve. Certainly, easyUnderstand, control valve 461 of the present invention comprises two-position three way magnetic valve but is not limited to this, can realize switching for otherEngine oil pressure chamber 465 and be easy to be arranged in control valve 461 structures in engine oil pressure chamber 465, is all applicable to the present invention.

According to some embodiments of the present invention, as shown in figure 10, actuating mechanism 400 also comprises displacement measuring device 463, shouldDisplacement measuring device 463 is for measuring the displacement of the first drive rod 412 and/or the second drive rod 432. For example, preferably,Because the first drive rod 412 and the second drive rod 432 are made mirror movements, therefore by a displacement measuring device 463 is setFor the displacement of measuring one of the first drive rod 412 and second drive rod 432, just can indirectly obtain another drive rodDisplacement.

By displacement measuring device 463 is set, can accurately obtain the displacement of the first drive rod 412 and the second drive rod 432,Thereby obtain the information such as the direction of motion and displacement of the first drive rod 412 and the second drive rod 432, and then convenient logicalCross the total amount that the controller of vehicle enters the 4th valve pocket 407 as ECU controls hydraulic oil, realize the first drive rod 412 andThe accurate control of two drive rod 432 displacements, the result that simultaneously also can record according to displacement measuring device 463 is revised first and is drivenThe position of lever 412 and the second drive rod 432, makes the position of the first drive rod 412 and the second drive rod 432 more accurate,Thereby obtain the valve lift amount of required the best, improve engine combustion efficiency and power output.

Wherein, be understandable that, displacement measuring device 463 has been prior art, and is those of ordinary skill in the artInstitute is known, and such as displacement measuring device 463 can be position sensor etc., here concrete for displacement measuring device 463Structure and operation principle are not made specified otherwise.

But the present invention is not limited to this, in another embodiment of the present invention, as shown in Figure 9, actuating mechanism 400Also comprise pressure tester 466, this pressure tester 466 is for the pressure of measuring machine oil pressure chamber 465 interior hydraulic oil. Thus,Pressure in the engine oil pressure chamber 465 recording by pressure tester 466, thus can indirectly calculate first piston 411With the position of the second piston 431, thus the positional information of acquisition the first drive rod 412 and the second drive rod 432. NeedBright, the pressure information in the engine oil pressure chamber 465 recording by pressure tester 466 calculates first piston 411 HesThe particular location of the second piston 431 for the ordinary skill in the art, is all understandable.

According to a preferred embodiment of the present invention, as shown in figure 11, the free end of the first shift fork 413 is provided with the first roller471, the first rollers 471 rollably push against the first cam 203, as shown in reference to Figure 11, and the periphery of the first roller 471Face is the outside that rolling surface pushes against the first cam 203. The free end of the second shift fork 433 is provided with the second roller 472, the secondRoller 472 rollably pushes against the second cam 207, and as shown in reference to Figure 11, the outer peripheral face of the second roller 472 is rolling surfacePush against the outside of the second cam 207.

By the first roller 471 and the second roller 472 being set to drive respective cams near motion, can reduce roller and protrudingThe wearing and tearing of wheel, make driving more reliable, increase the life-span of actuating mechanism 400.

Be appreciated that the first roller 471 and the second roller 472 can directly be pressed on respectively the first cam 203 and second protrudingOn the lateral surface of wheel 207. Certainly, for the wearing and tearing that reduce the first cam 203 and the second cam 207, preferably, as figureShown in 11, the outside of the first cam 203 and the second cam 207 can be respectively arranged with platen 464, and platen 464 is fixed onThe outside of one cam 203 or the second cam 207 and rotating with respective cams, the first roller 471 and the second roller 472 are respectivelyCompress accordingly the platen 464 of corresponding side, and not directly compress respective cams, can avoid like this roller and respective cams straightContact and cause respective cams wearing and tearing aggravation, affecting the life-span of cam.

According to other embodiment of the present invention, as shown in figure 19, actuating mechanism 400 also comprises clutch shaft bearing 221, the firstBearing 221 is suitable for being enclosed within on camshaft 201 and lays respectively at the first cam 203 and the first shift fork 413 and the second cam 207And between the second shift fork 433. That is to say, variable air valve lift apparatus comprises two according to an embodiment of the inventionOne bearing 221, one of them clutch shaft bearing 221 is located between the first cam 203 and the first shift fork 413, and another is first years oldBearing 221 is located between the second cam 207 and the second shift fork 433.

By between shift fork and cam (the first cam 203 and the second cam 207), clutch shaft bearing 221 being set, thereby be convenient toShift fork driving cam moves vertically, avoids between shift fork and cam directly contact friction to affect the life-span of cam. In brief,This embodiment is by clutch shaft bearing 221 is set, thereby compared with above-described embodiment, the pressure in above-described embodiment can be setDish 464 and the first roller 471 and the second roller 472.

Alternatively, as shown in figure 19, clutch shaft bearing 221 comprises inner ring 223 and outer ring 225, inner ring 223 and outer ring 225Between be provided with roll structure 227 so that inner ring 223 can rotate relatively with outer ring 225, inner ring 223 and the first cam 203Or second cam 207 preferably fit tightly together, outer ring 225 and the first shift fork 413 or the second shift fork 433 are preferably closelyFit together.

As shown in figure 19, the relative inner of the first cam 203 and the second cam 207 is all formed with and is suitable for locating elastic component 421Locating slot 221, in other words, it is protruding that the first cam 203 is provided with locating slot 221, the second towards a side of the second cam 207Wheel 207 is also formed with locating slot 221 towards a side of the first cam 203, and these two locating slots 221 are for installing positioning ejectionProperty part 421 is as spring.

Certainly, be understandable that, elastic component 421 also can directly be positioned on camshaft 201, for example, according to of the present inventionAn embodiment, variable air valve lift apparatus can also comprise keeper (scheming not shown), this keeper is used for elastic component421 are fixed on bent axle as spring, and for example this keeper can be screw or buckle structure, and its fixed position can be positioned at elasticityThe centre that part 421 is axial.

Below with reference to Fig. 1-Figure 24, the course of action of actuating mechanism 400 is according to an embodiment of the invention described.

Shown in Figure 10, the position of the first drive rod 412 shown in Figure 10 and the second drive rod 432 can be firstThe initial position of drive rod 412 and the second drive rod 432, the now left end of the first drive rod 412 and the second drive rod 432The one end being connected with respective pistons is concordant, and the right-hand member of the first drive rod 412 and the second drive rod 432 can stagger.But, should be appreciated that the present invention is not limited to this.

In the time need to regulating the lift amount of valve mechanism, for example, increase the lift amount of valve mechanism, now the first cam 203 HesThe second cam 207 needs near motion certain distance.

As shown in figure 10, now control valve 461 is opened, and the hydraulic oil in external hydraulic pipeline can enter by control valve 461In engine oil pressure chamber 465, the interior oil pressure in engine oil pressure chamber 465 increases, thereby hydraulic oil enters into by being communicated with oil duct 467The interior oil pressure of the second valve pocket 405, the second valve pocket 405 increases, thereby first piston 411 is moved to the left, first piston 411Be moved to the left the volume that the first valve pocket 404 can be compressed so that the liquid part in the first valve pocket 404 enters into the 3rd from connectivity partIn valve pocket 406, the interior fluid pressure of the 3rd valve pocket 406 increases, thereby the second piston 431 is moved right, the second piston 431Move right and can push elasticity reset device 441, make elasticity reset device 441 accumulation of energys.

In this process, the first drive rod 412 and the first shift fork 413 are moved to the left under the driving of first piston 411,The first shift fork 413 promotes the first cam 203 to left movement by its free-ended first roller 471, meanwhile, and secondDrive rod 432 and the second shift fork 433 move right under the driving of the second piston 431, and the second shift fork 433 by it certainlyPromote the second cam 207 by the second roller 472 of holding and move right, particularly, due to first piston 411 and the second piston431 directions of motion are contrary and speed is identical, and therefore the first cam 203 is also identical near the speed of motion with the second cam 207,The first cam 203 and the second cam 207 mirror movements relations.

On this basis, in the time that the lift amount that need to change valve mechanism for example reduces lift amount, control valve 461 can open withPart hydraulic oil in engine oil pressure chamber 465 is released, due to the cause that the hydraulic oil in engine oil pressure chamber 465 releases, makeOil pressure in the second valve pocket 405 that obtains engine oil pressure chamber 465 and be communicated with it all declines, now first piston 411 HesThe second piston 431 is in nonequilibrium condition, and before elasticity reset device 441 can discharge, the elastic potential energy of deposit, promotes secondPiston 431 is to left movement (with the direction of motion is contrary before), and the second piston 431 compresses the 3rd valve pocket 406, the three converselyLiquid in valve pocket 406 comes back in the first valve pocket 404 by connected component, and the volume in the first valve pocket 404 will increase,Thereby under the promotion of liquid, make first piston 411 move right (with the direction of motion is contrary before), first piston 411 toThe second valve pocket 405 is compressed in right athletic meeting, thereby the hydraulic oil in the second valve pocket 405 is leaked in engine oil pressure chamber 465,And finally reach new balance.

In this process, elastic component 421, by the elastic potential energy of laying in before discharging, drives the first cam 203 and the second cam207 motions dorsad, the first 203 moment of cam when motion (can by platen 464) compress the first roller 471, the second cams207 moment (can by platen 464) compress the second roller 472, until first piston 411 and the second piston 431 reach againTill new poised state.

In the process regulating, the controller of vehicle can be selected suitable valve liter according to engine current working as ECUCheng Liang, first piston 411 and the second piston 431 be to should selected valve lift amount having a specific activation point,The total amount that enters the hydraulic oil in the second valve pocket 405 by control realizes first piston 411 and the second piston 431 positionsAccurately control, wherein displacement transducer can feed back the concrete displacement information of the first drive rod 412 and the second drive rod 432, ECUCan the particular location of first piston 411 and the second piston 431 be adjusted and/or be revised with indirectly according to this displacement informationAdjust and/or revise the position of the first drive rod 412 and the second drive rod 432, thereby improve the accuracy of controlling.

Wherein, in above-mentioned course of action, the hydraulic oil in the external hydraulic pipeline being communicated with engine oil pressure chamber 465 enters intoHydraulic oil in engine oil pressure chamber 465 or in engine oil pressure chamber 465 flows out can be by being arranged on external hydraulic pipelineLubricating oil pump realize, this for the ordinary skill in the art, be obviously easily understand and be easy to realize.

1-Figure 24 describes cam rocker arm assembly according to some embodiments of the invention in detail with reference to the accompanying drawings.

According to one embodiment of present invention, cam rocker arm assembly comprises above-mentioned camshaft mechanism 200 and rocker arm body 300.

Shown in Figure 22-Figure 24, rocker arm body 300 also comprise air valve bridge 311 and 321, two of two fixed heads fixingPlate 321 is parallel and be located at relative to one another on air valve bridge 311, roller 301 be folded in pivotly two fixed heads 321 itBetween.

Air valve bridge 311 and two fixed heads 321 are preferably integrally formed, and for example, air valve bridge 311 can one with fixed head 321Moulding by casting, facilitates air valve bridge 311 and the overall processing and manufacturing of fixed head 321, simplified manufacturing technique like this. With reference to Fig. 4,Shown in Fig. 6 and Fig. 8, a side of air valve bridge 311 can be provided with fulcrum structure 341, the opposite side of air valve bridge 311 and valveMechanism 100 coordinates, and particularly, the opposite side of the top of valve mechanism 100 and air valve bridge 311 is (apart from fulcrum structure 341A side far away) be connected or be close to cam (the first cam 203 and the second cam 207) press-on roller 301 like this, roller301 drive whole rocker arm body 300 to swing around fulcrum structure 341, thereby drive valve mechanism 100 to move. Be appreciated that, fulcrum structure 341 has been prior art, and is well known for ordinary skill in the art, therefore here for propping upConcrete structure and the operation principle of dot structure 341 do not explain.

Owing to being provided with the cause of air valve bridge 311, therefore the bottom of each air valve bridge 311 can be provided with multiple valve mechanisms 100,An air valve bridge 311 can drive multiple valve mechanisms 100 to move simultaneously. In this area, many employings pair are at present entered twoThe intake and exhaust structure going out, therefore preferably, each air valve bridge 311 preferably drives two valve mechanisms 100, more specifically,Each air valve bridge 311 preferably drives the valve mechanism 100 of two air inlet sides.

Like this, can simplify the structure of variable air valve lift apparatus 1000, facilitate variable air valve lift apparatus 1000 to be arranged inIn cylinder cap 2000, and improve drive efficiency. Certainly, alternatively, an air valve bridge 311 also can only drive a valve mechanism100, or an air valve bridge 311 drives three or more valve mechanisms 100, and these technical schemes all fall into of the present inventionIn protection domain.

According to one embodiment of present invention, roller 301 is by through the bearing pin 331 of two fixed heads 321 pivotlyBe folded between two fixed heads 321. Preferably, (figure does not show between roller 301 and bearing pin 331, to be provided with the second bearingGo out), can reduce like this friction between roller 301 and bearing pin 331, improve the life-span of roller 301.

In another embodiment of the present invention, roller 301 can pivotable by the bearing pin 331 through two fixed heads 321Be folded between two fixed heads 321, roller 301 is integrally formed with bearing pin 331, preferably, at bearing pin 331 with solidDetermine can be provided with the 3rd bearing between plate 321.

Preferably, on bearing pin 331, be provided with position limiting structure (scheming not shown), this position limiting structure for bearing pin 331 axiallyUpper restriction roller 301, prevents that roller 301 from moving axially, and position limiting structure can be spacing preiection.

Shown in Figure 22, two transverse sides and two fixed heads 321 of roller 301 are spaced apart respectively. UnderstandableThat this is laterally the thickness direction of roller 301. Thus, roller 301 is spaced apart with fixed head 321, can avoid twoBetween person, rub, affect the life-span of roller 301.

According to one embodiment of present invention, be provided with reinforcement structure on air valve bridge 311, this reinforcement structure can be reinforcement,This reinforcement can be multiple and be evenly distributed on air valve bridge 311, to increase better the intensity of air valve bridge 311. AddStrong muscle and air valve bridge 311 can be one cast moldings, certainly, are understandable that, reinforcement can be to be also welded onOn air valve bridge 311.

Shown in Figure 22 and Figure 24, on roller 301, be configured with and the first roller cambered surface 303 of the first drive surface 205 adaptations,And on roller 301, be also configured with the second roller cambered surface 305 with the second drive surface 209 adaptations. Like this, at the first roller arcFace 303 coordinates with the chamfered portion of the first drive surface 205 and the inclined plane part of the second roller cambered surface 305 and the second drive surface 209While point cooperation, now cam (the first cam 203 and the second cam 207) and roller 301 contact for line line in theory. ?Between the first roller cambered surface 303 and the second roller cambered surface 305, can be provided with arc surface 307, this arc surface 307 and first drivesWhen the planar section of moving face 205 and the second drive surface 209 coordinates, the lift amount maximum of valve mechanism 100. Certainly, originallyInvention is not limited to this, in other embodiments of the invention, on roller 301, drives with the first drive surface 205 and secondFace 209 adaptations also can be inclined-plane or other profile.

The work of variable air valve lift apparatus 1000 is in accordance with a preferred embodiment of the present invention described below with reference to Fig. 1-Figure 24Process.

First with reference to Fig. 3 and Fig. 4, the first cam 203 in these two figure, the second cam 207 contact cooperation with roller 301To can be understood as be zero lift position in position, now camshaft 201 drives the first cam 203 and the second cam 207 to rotate,The first cam 203 and the second cam 207 can press-on roller 301, rocker arm body 300 can entirety around fulcrum structure341 swing, and therefore now the lift amount of valve mechanism 100 is zero, i.e. the air inlet of valve mechanism 100 airtight combustion chambers,Realize intelligent cylinder deactivation.

Secondly,, shown in Fig. 5 and Fig. 6, after engine operating condition changes, for example engine speed improves, and now startsMachine needs less air inflow, and hydraulic oil enters in engine oil pressure chamber 465 by control valve 461 and then enters into second valveIn chamber 405, directly to drive first piston 411, the first drive rod 412 and the first shift fork 413 to move, indirectly drive simultaneouslyMoving the second piston 431, the second drive rod 432 and the second shift fork 433 move (specifically drive process referring to above-mentioned for actuatingThe description of mechanism's 400 course of action) so that the first shift fork 411 can certainly be one first by a platen 464(Bearing 221) pushing the first cam 203, the second shift forks 442 by another platen 464(can certainly be another theOne bearing 221) pushing the second cam 207, make these two cams close, thereby change roller 301 and the first drive surface205 with the cooperation position that contacts of the second drive surface 209.

Shown in Fig. 5 and Fig. 6, the first cam 203 in these two figure, the second cam 207 are joined with contacting of roller 301It is little lift location that the position of closing can be understood as, and now camshaft 201 drives the first cam 203 and the second cam 207 to turnMoving, the first cam 203 and the second cam 207, by press-on roller 301, make rocker arm body 300 entirety around fulcrum structure341 swing by a small margin, thereby drive valve mechanism 100 to open air inlet, and therefore now the lift amount of valve mechanism 100 isLittle, be suitable for low engine speed small load condition.

Finally, shown in Fig. 7 and Fig. 8, after engine operating condition further changes, the rotating speed of for example engine is furtherImprove, now engine needs larger air inflow, and more hydraulic oil enters engine oil pressure chamber 465 by control valve 461In so enter in the second valve pocket 405, directly to drive first piston 411, the first drive rod 412 and the first shift fork413 actions, indirect driving of while the second piston 431, the second drive rod 432 and the second shift fork 433 move and (specifically drive formerReason is with above-mentioned consistent) so that the first shift fork 411 can certainly be a clutch shaft bearing 221 by a platen 464()Further pushing the first cam 203, the second shift forks 442 can certainly be another first axles by another platen 464(Hold 221) further push the second cam 207, make these two cams more close, drive thereby change roller 301 and firstThe cooperation position that contacts of moving face 205 and the second drive surface 209.

Shown in Fig. 7 and Fig. 8, the first cam 203 in these two figure, the second cam 207 are joined with contacting of roller 301It is high-lift position that the position of closing can be understood as, and now camshaft 201 drives the first cam 203 and the second cam 207 to turnMoving, the first cam 203 and the second cam 207, by press-on roller 301, make rocker arm body 300 entirety around fulcrum structure341 significantly swing, thereby drive valve mechanism 100 to open air inlet, and therefore now the lift amount of valve mechanism 100 isBe suitable for high engine speeds high load working condition greatly.

In this process, roller 301 can with the planar portions of the planar section of the first drive surface 205 and the second drive surface 209Divide and coordinate, certainly, be understandable that, the invention is not restricted to this, the first drive surface 205 and the second drive surface 209 also canBe inclined-plane, in above-mentioned whole adjustment process, roller 301 all with inclined-plane (the first drive surface 205 and the second drive surface 209)Contact coordinates.

In the time that the operating mode of engine becomes low speed or small load condition again again, the hydraulic oil in the second valve pocket 405 can partly pass throughEngine oil pressure chamber 465 and control valve 461 flow in external hydraulic oil circuit, now at elastic component 421 as the elastic force of springUnder effect, the first cam 203 and the second cam 207 will move dorsad, increase the distance of the two, thereby change roller 301With the first drive surface 205 and the second drive surface 209 contact cooperation position (for example becoming above-mentioned little lift location again), and then fallThe lift of low valve mechanism 100, makes valve stroke corresponding with the operating mode of engine.

In brief, according to a preferred embodiment of the present invention, enter or flow out the hydraulic pressure in the second valve pocket 405 by controlThe oil mass of oil, can realize the first cam 203 and the second cam 207 near or away from (coordinate with elastic component 421), theOne cam 203 and the second cam 207 near or away from rear, on roller 301 and the first cam 203 and the second cam 207The first drive surface 205 changes with the cooperation position that contacts of the second drive surface 209, thus can obtain required and withThe valve lift amount that engine current working adapts.

For the second drive surface 209 and roller on the first drive surface 205, the second cam 207 on the first cam 203The first roller cambered surface 303, the second roller cambered surface 305 and arc surface 307 on 301, can adapt to according to different enginesProperty design its line style, thereby at engine under different operating modes, by changing roller 301 and the first cam 203 and secondThe contact cooperation position of cam 207, realize valve stroke adaptability regulate, to meet engine current working, this forThose of ordinary skill in the art is obviously that appearance is intelligible.

In addition, it should be noted that, in description of the invention, above-mentioned with a camshaft 201 with and on oneOne cam 203 and the second cam 207, for example is only schematically to illustrate, can not be interpreted as it is to a kind of restriction of the present invention.Two of an above-mentioned camshaft 201, first cam 203 and second cam 207 preferably corresponding cylinders are enteredGas side valve mechanism 100, those of ordinary skill in the art is reading on the basis of the above-mentioned disclosure of description, knotClose conventional techniques means and the common practise of this area, many groups the first cam 203 obviously can be set on a camshaft 201With the second cam 207, for example, taking the engine of four-cylinder as example, four pairs of the first cams 203 and second obviously can be set protrudingWheel 207(as shown in Figure 2).

Generally speaking, according to an embodiment of the invention for the variable air valve lift apparatus 1000 of engine, can have asLower advantage:

1) variable air valve lift apparatus 1000 of the embodiment of the present invention can be realized the continuous variable of valve stroke;

2) variable air valve lift apparatus 1000 of the embodiment of the present invention can be according to engine operating condition to the valve opening duration and openClosing the moment regulates, and makes charging efficiency the best under the each operating mode of engine, is of value to dynamic property, economy and the row of enginePut;

3) variable air valve lift apparatus 1000 of the embodiment of the present invention is applicable to the vapour of any camshaft actuated valve mechanism 100Oil machine and diesel engine, applied widely, be beneficial to Negative valve overlap, emptying supercharging, cylinder stopping technique and the HCCI technology of realizing;

4) variable air valve lift apparatus 1000 of the embodiment of the present invention coordinates VVT use can realize port timing and valveThe full variable technique of lift;

5, the compact conformation of the variable air valve lift apparatus 1000 of the embodiment of the present invention, does not increase engine height, is convenient to clothPut, cost is low.

Simply describe according to the engine of the embodiment of the present invention below.

Engine comprises according to the actuating mechanism 400 of describing in the above embodiment of the present invention according to an embodiment of the invention.

The engine of the embodiment of the present invention is owing to adopting the cause of actuating mechanism 100 of above-mentioned variable air valve lift apparatus 1000,Therefore there is the advantages such as dynamic property is strong, fuel economy is good.

It should be noted that, according to other configuration example of the engine of the embodiment of the present invention as body group, toggle,Cooling system, lubricating system etc. have been all prior art, and are well known for ordinary skill in the art, can for theseAdopt the part identical or close with prior art, describe in detail no longer one by one herein.

Simply describe according to the vehicle of the embodiment of the present invention below.

Vehicle comprises engine according to the above embodiment of the present invention according to an embodiment of the invention.

Cause according to the vehicle of the embodiment of the present invention due to the above-mentioned engine of employing, therefore good dynamic property, fuel economy is good,Discharge low.

It should be noted that, according to other configuration example of the vehicle of the embodiment of the present invention as speed changer, brakes, power trainSystem, vehicle body etc. have been all prior art, and are well known for ordinary skill in the art, and can adopt with existing for theseThe part that technology is identical or close is described in detail herein no longer one by one.

In the description of this description, reference term " embodiment ", " some embodiment ", " example ", " specifically showExample " or the description of " some examples " etc. the specific features that means to describe in conjunction with this embodiment or example, structure, material orFeature is contained at least one embodiment of the present invention or example. In this manual, the schematic statement to above-mentioned termNot must for be identical embodiment or example. And specific features, structure, material or the feature of description canIn any one or more embodiment or example with suitable mode combination. In addition, those skilled in the art can be byDifferent embodiment or the example in this description, described engage and combine.

Although illustrated and described embodiments of the invention above, be understandable that, above-described embodiment is exemplary,Can not be interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-described embodimentChange, amendment, replacement and modification.

Claims (10)

1. for an actuating mechanism for the variable air valve lift apparatus of engine, described variable air valve lift apparatus comprises camAxis mechanism, described camshaft mechanism comprises camshaft, the first cam and the second cam, it is characterized in that described actuating mechanismComprise:

Hydraulic valve block, has the first chamber and the second chamber in described hydraulic valve block;

First piston, described first piston is located at movably in described the first chamber and described the first chamber isolation is become each otherIndependently the first valve pocket and the second valve pocket;

The second piston, described the second piston is located at movably in described the second chamber and described the second chamber isolation is become each otherIndependently the 3rd valve pocket and the 4th valve pocket, wherein said the 3rd valve pocket is identical with described the first valve pocket shape and communicate with each other, andAnd be full of liquid in described the 3rd valve pocket and described the first valve pocket;

The first drive rod, described the first drive rod is connected with described first piston and moves with described first piston, and described firstOn drive rod, be provided with the first shift fork;

The second drive rod, described the second drive rod is connected with described the second piston and moves described second with described the second pistonOn drive rod, be provided with the second shift fork;

Fuel feeding oil return mechanism, described fuel feeding oil return mechanism is communicated with described the second valve pocket; And

Elasticity reset device, described elasticity reset device is located in described the 4th valve pocket and is suitable for flexibly compressing described second and livesPlug; And

Elastic component, described elastic component is suitable for being flexibly pressed between described the first cam and described the second cam.

2. the actuating mechanism of the variable air valve lift apparatus for engine according to claim 1, is characterized in that,Described hydraulic valve block hollow and inside are provided with spacing block, and the inner space of described hydraulic valve block is isolated into institute by described spacing blockThe first chamber of stating and the second chamber, the free-ended end face of described spacing block and described hydraulic valve block and this spacing block fromInternal face by the relative sidewall of end end face is spaced apart, to be communicated with described the first valve pocket and described the 3rd valve pocket.

3. the actuating mechanism of the variable air valve lift apparatus for engine according to claim 1, is characterized in that,

One end of described the first drive rod inwardly extend in described the second valve pocket and is fixed on from a sidewall of described the second valve pocketOn one side of described first piston;

One end of described the second drive rod inwardly extend in described the 4th valve pocket and is fixed on from a sidewall of described the 4th valve pocketOn one side of described the second piston.

4. the actuating mechanism of the variable air valve lift apparatus for engine according to claim 3, is characterized in that,Described elasticity reset device is spring, in the part of described spring housing in described the 4th valve pocket of stretching into of described the second drive rod.

5. the actuating mechanism of the variable air valve lift apparatus for engine according to claim 1, is characterized in that,On described hydraulic valve block, be provided with the leakage hole being communicated with described the 4th valve pocket.

6. the actuating mechanism of the variable air valve lift apparatus for engine according to claim 1, is characterized in that,Each in described first piston and described the second piston is all formed as cuboid or the square bodily form.

7. the actuating mechanism of the variable air valve lift apparatus for engine according to claim 1, is characterized in that,Described fuel feeding oil return mechanism comprises:

Engine oil pressure chamber, is connected by being communicated with oil duct between described engine oil pressure chamber and described the second valve pocket; And

Be used to open or close the control valve in described engine oil pressure chamber.

8. the actuating mechanism of the variable air valve lift apparatus for engine according to claim 7, is characterized in that,Also comprise the pressure tester for measuring described engine oil pressure intraluminal fluid force feed pressure.

9. the actuating mechanism of the variable air valve lift apparatus for engine according to claim 1, is characterized in that,Also comprise clutch shaft bearing, described clutch shaft bearing is suitable for being enclosed within on described camshaft and lays respectively at described the first cam and describedBetween one shift fork and described the second cam and described the second shift fork.

10. an engine, is characterized in that, comprise according to described in any one in claim 1-9 for engineThe actuating mechanism of variable air valve lift apparatus.