CN100400804C - Valve-moving device for engine - Google Patents
Valve-moving device for engine Download PDFInfo
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- CN100400804C CN100400804C CNB2004800154540A CN200480015454A CN100400804C CN 100400804 C CN100400804 C CN 100400804C CN B2004800154540 A CNB2004800154540 A CN B2004800154540A CN 200480015454 A CN200480015454 A CN 200480015454A CN 100400804 C CN100400804 C CN 100400804C
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- connecting rod
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Abstract
In an engine where a valve lift amount can be continuously varied, a valve-moving device, having a valve lift-varying mechanism, for an engine is capable of increasing and reducing a valve lift amount without changing a valve opening angle and is also capable of reducing a tappet clearance according to reduction in the valve lift amount. This prevents an increase in the ratio of a tappet clearance to a valve lift amount in a low valve lift condition, minimizing effects by variation of a tappet clearance and also reducing a valve seating speed in a low valve lift condition to prevent noise from being produced. Reduction in engine performance in a high valve lift condition caused by variation of a tappet clearance is prevented and a valve seating noise in a low valve lift condition is reduced.
Description
Technical field
The present invention relates to the valve device of motor, it has the valve lift amount of making continually varying variable air valve lift range mechanism.
Background technique
Described engine valve transmission device is open in TOHKEMY 2004-036560 communique.This device is by 2 connecting rods, the rocker arm pivots that drives valve is supported on the engine body, driving wherein with the valve driving cam, a connecting rod makes the rocking arm swing, simultaneously, by an above-mentioned connecting rod is moved in the position of engine body side fulcrum, just can under the situation that does not change valve open angle (opening angle), lift amount be changed continuously.
But, in the engine valve transmission device, because between the adjustment bolt and valve rod end on the rocking arm, be provided with predetermined tappet clearance (tappet clearance), therefore, begin action even if be used in the rocking arm of opening valve, but valve is lift immediately not; rocking arm is only empty moving by the tappet clearance amount, and after adjusting bolt contact valve rod end, valve just begins lift.
Figure 10 represents the valve lift curve of above-mentioned existing valve device.Though this valve device can change valve lift, but because during no matter high valve lift or during low valve lift, the tappet clearance does not change, under the state of low valve lift, the tappet clearance is excessive to the ratio of valve lift amount, the deviation a little of tappet clearance will produce influence greatly to sucking air quantity, carry out meticulous adjustment to it and just have this problem that must expend a large amount of labours and time.Especially, in the motor of so variable valve lift,, therefore, just can not ignore the influence of above-mentioned tappet clearance deviation because all be in the following low valve lift state of 1.5mm most of running time.
In addition, in above-mentioned existing valve device, from the plotted curve of Figure 10 as can be seen, speed (with reference to the slope H of valve lift curve) during with high valve lift during air valve drop is compared, because the speed (with reference to the slope L of valve lift curve) during low valve lift during air valve drop becomes big, so when low valve lift, the noise of taking a seat of valve is increased especially, perhaps conversely the durability of valve device be caused bad influence.For avoiding this problem, if the profile of change cam, the seating velocity of the valve when realizing reducing low valve lift, the opening and closing speed of the valve in the time of then can reducing specifically high valve lift again produces the problem that motor can not be brought into play the output performance of expectation.
Summary of the invention
The present invention In view of the foregoing proposes, its purpose is, on the motor that valve lift amount is continuously changed, the performance that both can prevent the motor when the high valve lift that causes because of the tappet clearance deviation is low, simultaneously, can reduce the noise of taking a seat of the valve when hanging down valve lift again.
For achieving the above object, engine valve transmission device of the present invention, it has the variable air valve lift range mechanism that valve lift amount is continuously changed, it the 1st is characterised in that, this variable air valve lift range mechanism has rocking arm and two connecting rods with the valve interlock, these two connecting rods can be followed the motion of rocking arm and swing when being connected to this rocking arm, one of described connecting rod pivots and is supported on the end, this end can be according to the operating condition swing of motor, and can adjust the tappet clearance according to the variation of valve lift amount.
According to the 1st such feature, when the valve lift that makes motor changes continuously, the tappet clearance is adjusted in variation by corresponding valve lift amount, just can be according to operating condition, accurately control valve lift amount, prevent that the performance of motor is low, and, can prevent the increase of valve crash speed, realize reducing noise.
In addition, the present invention the 2nd is characterised in that, on the basis of the structure of the 1st feature, described rocking arm have butt valve rod end valve connect the cam abutting part of portion and butt valve cam; The 1st connecting rod of one of described two connecting rods, the one end is supported on the rocking arm by pivot at the 1st fulcrum, and the other end is supported on the engine body by pivot at the 2nd fulcrum; The 2nd connecting rod of one of described two connecting rods, the one end is supported on the engine body by pivot at the 4th fulcrum, and the other end is supported on the rocking arm by pivot at the 3rd fulcrum; And crank part, it makes the fulcrum that pivot to support above-mentioned the other end of at least one side's connecting rod in the 1st, the 2nd connecting rod, around with the axis swing of the shaft parallel of valve driving cam.Crank part is around the above-mentioned axis of its swing, and the axis of the fulcrum of an above-mentioned end of the above-mentioned at least one side's connecting rod of support that is pivoted relative to each other forms eccentric.
According to the 2nd such feature, crank part changes the position of supporting the fulcrum of the other end of at least one side's connecting rod in the 1st, the 2nd connecting rod that pivots, this crank part is around its axis that shakes, the axis of the fulcrum that supports above-mentioned at least one side's connecting rod one end of being pivoted relative to each other produces eccentric, only utilize so simple structure, the tappet clearance is adjusted in variation that just can corresponding valve lift amount.
And then the of the present invention the 3rd is characterised in that, the above-mentioned the 1st or the architecture basics of the 2nd feature on, reducing of corresponding valve lift amount reduces the tappet clearance.According to described structure, since according to valve lift amount reduce the tappet clearance is reduced, therefore, the ratio of tappet clearance and lift amount increases in the time of can preventing to hang down valve lift, the influence of tappet clearance deviation is suppressed at bottom line, simultaneously, the seating velocity of the valve when hanging down valve lift is reduced, can prevent the generation of noise.And, owing to can guarantee when hanging down valve lift, also can suck more air quantity, it is hereby ensured the motor output when hanging down valve lift.
In addition, embodiment's valve mechanism cover 16 and intake cam support 46 are corresponding with engine body of the present invention, embodiment's intake valve 19 is corresponding with valve of the present invention, embodiment's last connecting rod 61 and lower link 62 respectively with the present invention the 1st, the 2nd connecting rod correspondence, embodiment's upper pin 64; pitman arm shaft 67; lower pin 66 and the 68a of rocking pin portion are corresponding with the present invention the 1st～the 4th fulcrum respectively; embodiment's roller 65 is corresponding with cam abutting part of the present invention; embodiment's cam 69 is corresponding with valve driving cam of the present invention, embodiment's adjustment bolt 70 is corresponding to contacting part with valve of the present invention.
Description of drawings
Fig. 1～Fig. 9 represents one embodiment of the present of invention, and Fig. 1 is the partial longitudinal section (along the sectional drawing of the 1-1 line of Fig. 2) of motor.Fig. 2 is the sectional drawing along the 2-2 line of Fig. 1.Fig. 3 is the direction view along the 3-3 arrow line of Fig. 2.Fig. 4 is the profile of variable air valve lift range mechanism.Fig. 5 is the stereogram of variable air valve lift range mechanism.Fig. 6 is the direction view along the arrow 6 of Fig. 3.Fig. 7 A, Fig. 7 B are the Action Specification figure of tappet clearance change.Fig. 8 A, Fig. 8 B are the Action Specification figure of valve lift change.Fig. 9 is the figure of the relation of expression valve lift curve and tappet clearance.Figure 10 is the figure of the valve lift curve of the existing valve device of expression.
Embodiment
Below, if the one embodiment of the present of invention with reference to the accompanying drawings, when embodiments of the present invention were described, at first, as shown in Figure 1, multiple cylinder engine E in upright arrangement had: cylinder block 12, and its inside is provided with cylinder barrel 11; Piston 13 is entrenched in the cylinder barrel 11 its free sliding; Cylinder head 14, its end face with cylinder block 12 combines; Firing chamber 15, it is formed between cylinder head 14 and the piston 13; And valve mechanism cover 16, its end face with cylinder head 14 combines.On cylinder head 14, be formed with the suction port 17 and the relief opening 18 that are communicated with each firing chamber 15, suction port 17 is opened and closed by 2 intake valves 19,19, relief opening 18 is opened and closed by 2 exhaust valves 20,20, be entrenched in the valve guide bushing of being located on the cylinder head 14 21 the valve stem 19a free sliding of each intake valve 19, by being configured in the valve spring 24 between the lower spring cup 22,23, be endowed potential energy to the direction of closing valve.In addition, the valve stem 20a of each exhaust valve 20 is entrenched in the valve guide bushing of being located on the cylinder head 14 25 free sliding, by being configured in the valve spring 28 between the lower spring cup 26,27, is endowed potential energy to the direction of closing valve.
With reference to figure 2, on cylinder head 14, be provided with support 44 integratedly in the lump, it has the supporting walls 44a that is configured in each cylinder both sides, on each supporting walls 44a, is combined with and covers 45,47, and their cooperations constitute intake cam support 46 and exhaust cam support 48.So, on intake cam support 46, rotate and freely be supported with admission cam shaft 31, on exhaust cam support 48, rotate and freely be supported with exhaust cam shaft 32, intake valve 19,19 is driven by variable air valve lift range mechanism 33 by admission cam shaft 31, and exhaust valve 20,20 drives by variable valve lift valve timing mechanism (valve lift/valve timing changingmechanism) 34 by exhaust cam shaft 32.
The variable valve lift valve timing mechanism 34 that drives exhaust valve 20,20 is a known configurations, and its summary is described herein.On the exhaust rocker arm axle 35 that supports by the supporting walls 44a in the exhaust cam support 48, pivot and support 2 low speed a end and 1 end of using rocking arm 37 at a high speed with rocking arm 36,36, be arranged on 2 low speed on the exhaust cam shaft 32 with cam 39,39 and be arranged on roller 38,38 butts of low speed with rocking arm 36,36 intermediate portions, be arranged on the exhaust cam shaft 32 high speed with cam 41 be arranged on roller 40 butts of usefulness rocking arm 37 intermediate portions at a high speed.Be arranged on low speed the adjustment bolt 42,42 of rocking arm 36,36 the other ends and the valve rod end butt of exhaust valve 20,20.
As motor E during at low-speed running, when make with oil pressure low speed with rocking arm 36,36 when separating at a high speed with the combination of rocking arm 37, low speed drives with cam 39,39 with the low speed of rocking arm 36,36 by correspondence, and exhaust valve 20,20 opens and closes with low valve lift, low open angle (opening angle).In addition, when motor E when running up, when low speed being combined as a whole with rocking arm 37 with rocking arm 36,36 and high speed with oil pressure, drive with cam 41 with the high speed of rocking arm 37 at a high speed by correspondence, by with the low speed that combines with rocking arm 37 at a high speed with rocking arm 36,36, exhaust valve 20,20 is with high valve lift, high open angle (opening angle) switching.In this wise, by valve lift air valve correct-timing variable mechanism 34, the valve lift of exhaust valve 20,20 and valve timing the branch two-stage control.
Secondly, according to Fig. 3～Fig. 6, the structure of variable air valve lift range mechanism 33 is described, variable air valve lift range mechanism 33 has: the last connecting rod 61 of fork-shaped (ニ thigh); Lower link 62, it forms than last connecting rod 61 weak points, and is configured in the below of connecting rod 61; And rocking arm 63.
Last connecting rod 61 roughly forms U word shape, and it has: a pair of the 1st joint 61a, 61a, and it is from sandwich rocking arm 63; Fixed support portion 61b, it is cylindric; A pair of arm 61c, 61c, it is connected between two the 1st joint 61a, 61a and the fixed support portion 61b.
At an end of rocking arm 63, be provided with pair of bolts assembly department 63a, 63a, its adjustment bolt 70,70 with the valve stem upper end that contacts a pair of intake valve 19,19 from the top screws togather, and makes it can regulate the advance and retreat position.In addition, the other end of rocking arm 63 is towards forming roughly U word shape with intake valve 19,19 opposite sides with opening, is provided with at the other end of rocking arm 63: the 1st supporting portion 63c, and it is used for connecting rotationally an end of connecting rod 61; The 2nd supporting portion 63d, it connects an end of lower link 62 rotationally, and makes the 2nd supporting portion 63d be configured in the below of the 1st supporting portion 63c.And, roller 65 with the cam 69 of admission cam shaft 31 rolls and contacts is configured to be roughly the 1st supporting portion 63c clamping of U word shape, and makes its end joint with last connecting rod 61 coaxial, by upper pin 64, being pivoted is supported on the 1st supporting portion 63c.
And, on the top of rocking arm 63, promptly dispose between the part of roller 65 at an end of this rocking arm 63 and the other end of rocking arm 63, to give prominence to and be provided with stiffening rib 63b, they are between above-mentioned two bolt assembly department 63a, 63a.
In addition; rocking arm 63 should form like this; make along the distolateral width on the direction of the spin axis of above-mentioned cam 69, promptly the distance along between the outer end of above-mentioned spin axis of two bolt assembly department 63a, 63a is bigger than the width of other parts, the 1st form identical width with the 2nd supporting portion 63c, 63d.
The 1st joint 61a, the 61a of one end of last connecting rod 61, by inserting logical and being fixed on upper pin 64 in the 1st attachment hole 49 of the 1st supporting portion 63c that is arranged at rocking arm 63, be rotatably connected on the other end of above-mentioned rocking arm 63, in the other end of rocking arm 63, it is in the face of the outer side surface of the part of above-mentioned admission cam shaft 31, and the outer side surface of the 1st joint 61a, 61a of an end of going up connecting rod 61 when observing from the side with overlapping state, the axis that forms with above-mentioned upper pin 64 is the circular-arc of center.
Be configured in the lower link 62 of connecting rod 61 belows, on the one end, has the 2nd joint 62a, simultaneously, on the other end, has movable supporting portion 62b, straight line between the spin axis at the two end part of connecting rod 61 in the connection is made as L1, when when observing with the direction of L1 quadrature, lower link 62 is configured between above-mentioned two arm 61c, the 61c of connecting rod 61, form planar.In addition, the 2nd joint 62a is configured to by the 2nd supporting portion 63d clamping that roughly forms U word shape, by below above-mentioned upper pin 64, insert logical and be fixed in the 2nd attachment hole 50 that is arranged on the 2nd supporting portion 63d, the 2nd joint 62a is connected on the 2nd supporting portion 63d of the other end of rocking arm 63 rotationally.
Promptly; rocking arm 63 has above-mentioned roller 65 with cam 69 butts at the other end upper lateral part; an end of this rocking arm 63 and a pair of intake valve 19,19 link in linkage, rotatably, be connected with side by side up and down: the 1st joint 61a, 61a that an end of the last connecting rod 61 of top is had in the other end of rocking arm 63; And an end that is configured in the lower link 62 of connecting rod 61 belows the 2nd joint 62a, the 62a that are had.
The fixed support portion 61b of the other end of last connecting rod 61 is supported rotatably on the pitman arm shaft 67 that is fixed in camshaft stand 29, and the movable supporting portion 62b that the other end had of lower link 62 is supported rotationally by the 68a of rocking pin portion.And lower link 62 forms than last connecting rod 61 weak points, and the movable supporting portion 62b of the other end of lower link 62 compares with the fixed support portion 61b of the other end of last connecting rod 61, is configured in the position near intake valve 19,19.
The above-mentioned rocking pin 68a of portion is set on the crank part 68, this crank part 68 makes an above-mentioned rocking pin 68a of portion and an axial region 68c along opposite direction highlightedly, be provided with meeting at right angles at the two ends that connect board 68b, above-mentioned connection board 68b is configured on the plane parallel with the action plane of lower link 62.Above-mentioned axial region 68c is rotated and freely is supported in the supported hole 16a, and supported hole 16a is set on the valve mechanism cover 16.
So, the 68a of rocking pin portion is under the state of the high valve lift of the position that is in Fig. 8 A, and as shown in Figure 4 and Figure 5, lower pin 66 pivots lower link 62 and is supported on the rocking arm 63, the axis C1 of relative lower pin 66, the eccentric slightly downwards δ of axis C2 of an axial region 68c of crank part 68.
On last connecting rod 61, be formed with the accommodating part 60 that can hold movable supporting portion 62b, on the movable supporting portion 62b that makes at least in the other end of lower link 62 is the most approaching under the state of connecting rod 61 sides, when observing from the side, make the straight line L2 between the downside of lower link 62 sides of the 1st joint 61a, the 61a that connect to go up connecting rod 61 and fixed support portion 61b, with a part of overlaid of above-mentioned movable supporting portion 62b.
Above-mentioned accommodating part 60 is made of following part: opening portion 60a, and the part that it can hold movable supporting portion 62b is formed between two arm 61c, the 61c of connecting rod 61; Recess 60b, at least a portion that it can hold the above-mentioned rocking pin 68a of portion is formed on the bottom of above-mentioned two arm 61c, 61c.Last connecting rod 61 forms Pear Shaped because formed above-mentioned recess 60b when observing from the side.
In addition, on above-mentioned rocking arm 63, be provided with a pair of connecting wall 63e integratedly, be used for coupling together being roughly between the 1st and the 2nd supporting portion 63c, the 63d of U word shape.And connecting wall 63e should form like this, with respect to the tangent tangent line L3 of outer rim of above-mentioned two intake valves, 19,19 sides of the 1st and the 2nd attachment hole 49,50, make its at least a portion be configured in intake valve 19,19 opposite sides on, and will couple together between the 1st and the 2nd supporting portion 63c, the 63d.
In addition, on connecting wall 63e, form recess 51, at the movable supporting portion 62b of the other end of lower link 62 under the state near rocking arm 63 sides, make this recess 51 be positioned in the face of the position of the 68a of rocking pin portion be configured.And then, on above-mentioned connecting wall 63e, for example to form lightening hole portion 52 from the recessed mode of the inside side's side of outer side surface.
An axial region 68c of above-mentioned crank part 68, outstanding from the supported hole 16a of valve mechanism cover 16, be fixed with control arm 71 on the top of this axial region 68c, this control arm 71 is driven by the actuator motor 72 that is installed in cylinder head 14 outer walls.That is, be engaged with nut part 74 on the thread spindle 73 by actuator motor 72 rotary driving, an end that connects connecting rod 76 is pivoted by pin 75 and is supported on the nut part 74, and the other end that connects connecting rod 76 is connected on the control arm 71 by pin 77,77.Thereby, when making actuator motor 72 actions, nut part 74 moves along the thread spindle 73 that rotates, be connected with nut part 74 by connecting connecting rod 76 control arms 71, make crank part 68 around an axial region 68c swing by this control arm 71, thereby the 68a of rocking pin portion moves between the position of Fig. 7 A and Fig. 7 B.
Secondly, effect to embodiment with said structure describes, when making control arm 71 swing to the solid line position of Fig. 3 by actuator motor 72, the crank part 68 (with reference to figure 5) that is connected to control arm 71 rotates in the counterclockwise direction, shown in Fig. 8 A, rise by the 68a of rocking pin portion that makes crank part 68, at this moment the shape of the quadratic crank mechanism that pitman arm shaft 67, upper pin 64, lower pin 66 and the 68a of rocking pin portion are coupled together is roughly triangle.Under this state, when when being arranged on cam 69 on the admission cam shaft 31 and pushing roller 65, make the quadratic crank mechanism distortion, rocking arm 63 is swung downwards to solid line position from the dot and dash line position, adjust bolt 70,70 and push the valve rod end of intake valve 19,19, open valve with high valve lift.
When passing through actuator motor 72, when making control arm 71 swing to the dot and dash line position of Fig. 3, the crank part 68 that connects control arm 71 is rotated in a clockwise direction, shown in Fig. 8 B, descend by the 68a of rocking pin portion that makes crank part 68, at this moment the shape of the quadratic crank mechanism that pitman arm shaft 67, upper pin 64, lower pin 66 and the 68a of rocking pin portion are coupled together roughly becomes trapezoidal.Under this state, when when being arranged on cam 69 on the admission cam shaft 31 and pushing roller 65, make the quadratic crank mechanism distortion, rocking arm 63 is swung downwards to solid line position from the dot and dash line position, adjust bolt 70,70 and push the valve rod end of intake valve 19,19, open valve with low valve lift.
Its result, from the valve lift curve of intake valve shown in Figure 9 19,19 as can be known, open angle during the low valve lift of open angle (opening angle) in the time of can making the high valve lift of corresponding diagram 8A and corresponding diagram 8B, remain under the identical state, and valve lift amount is changed continuously.
If be explained according to Fig. 7 A, Fig. 7 B, Fig. 7 A represents high valve lift state, at this state, crank part 68 is swung in the counterclockwise direction, lower link 62 rises on the end of the 68a of rocking pin portion side, and Fig. 7 B represents low valve lift state, at this state, crank part 68 is swung along clockwise direction, and lower link 62 descends in the end of the 68a of rocking pin portion side.Compare both as can be known, under the low valve lift state of Fig. 7 B; the position of rocking arm 63; corresponding point scribing position (position of the high valve lift state of Fig. 7 A); drop to solid line position slightly, adjustment bolt 70,70 of this part and the tappet clearance between the valve rod end of intake valve 19,19 are reduced.
As shown in Figure 9, tappet clearance during with high valve lift relatively, because the tappet clearance when hanging down valve lift diminishes, therefore, when hanging down valve lift, by suppressing the relative increase of tappet clearance to the ratio of the lift amount of intake valve 19,19, the influence of tappet clearance deviation can be suppressed to inferior limit, can prevent that the performance of motor E from reducing.And, the seating velocity of the intake valve 19,19 during with respect to high valve lift (with reference to the slope H of valve lift curve), can prevent to make intake valve 19,19 seating velocities (with reference to the slope L of valve lift curve) when hanging down valve lift to increase, can reduce the noise of taking a seat when hanging down valve lift.And then, owing to when hanging down valve lift, also can guarantee to suck air quantity more, and therefore, the output of the motor E in the time of can guaranteeing to hang down valve lift.
In addition, end at rocking arm 63, be provided with pair of bolts assembly department 63a, 63a, the adjustment bolt 70,70 that is used for and is connected on a pair of intake valve 19,19 respectively screws togather, make them can regulate the advance and retreat position since from an end of rocking arm 63 to the part of the above-mentioned roller 65 of configuration, the outstanding stiffening rib 63b that is provided with on rocking arm 63, this stiffening rib 63b is configured between two bolt assembly department 63a, the 63a, therefore can realize improving the rigidity of rocking arm 63.
In addition, last connecting rod 61 has: a pair of the 1st joint 61a, 61a, and it is from sandwich rocking arm 63; Fixed support portion 61b; And a pair of arm 61c, 61c, it is connected between two the 1st joint 61a, 61a and the fixed support portion 61b.Lower link 62, when from the rotation axis that is connected connecting rod 61 two end part between the direction of straight line L1 orthogonal when observing, lower link 62 is configured between above-mentioned two arm 61c, the 61c, and forms planar.Therefore, compare with lower link 62, can make and bear 61 realization light weight and the miniaturizations of the less last connecting rod of load, and form planar, and can guarantee the rigidity of lower link 62 and realize lightweight by the lower link 62 that effect is had the load bigger than the load of last connecting rod 61.
And, at least on above-mentioned movable supporting portion 62b is the most approaching under the state of connecting rod 61 sides, when observing from the side, make and connect the 1st joint 61a that goes up connecting rod 61, straight line L2 between the side of lower link 62 sides of 61a and fixed support portion 61b, a part of overlaid with movable supporting portion 62b, and on last connecting rod 61, be formed with the accommodating part 60 that can hold movable supporting portion 62b, therefore, both can set the displacement amount of movable supporting portion 62b bigger, make intake valve 19,19 variable valve lift amount strengthens, can make connecting rod 61 and lower link 62 approaching mutually again, can make the valve device compactness.And, because the part of above-mentioned accommodating part 60 is formed between above-mentioned two arm 61c, the 61c, therefore, by making connecting rod 61 and lower link 62 more approaching, just can realize compactness more, and then, because accommodating part 60 forms at least a portion that can hold the 68a of rocking pin portion, therefore by making connecting rod 61 and lower link 62 further approaching, just can make further compactness of valve device.
The the 1st and the 2nd joint 61a of one end of last connecting rod 61 and lower link 62,62a, be connected to the other end of rocking arm 63 up and down side by side and rotatably; an end of rocking arm 63 then with intake valve 19; 19 link in linkage; lower link 62 is compared with last connecting rod 61; it forms shortlyer; because the movable supporting portion 62b of the other end of lower link 62 is with respect to the fixed support portion 61b of the other end of last connecting rod 61; be configured near intake valve 19; 19 position; therefore; by crank part 68; according to lever principle; just can suppress the moment that affacts the reaction force on the control arm 71 from lower link 62 smaller; can reduce the load that is applied on control arm 71 and the actuator motor 72, can expect to improve the reliability and the durability of control arm 71 and actuator motor 72.
On rocking arm 63, the 1st joint 61a that connects an end of connecting rod 61 by upper pin 64 rotationally, 61a, simultaneously, roller 65 is pivoted by upper pin 64 and is supported, owing to face the outer side surface of the part of admission cam shaft 31 in the rocking arm 63, the 1st joint 61a with an end of last connecting rod 61, the axis that the outer side surface of 61a forms with upper pin 64 is the circular-arc of center, make that they are in overlap condition when observing from the side, therefore, rocking arm 63 and last connecting rod 61 and admission cam shaft 31 interferences both can have been avoided, can one end of connecting rod 61 be pivotally connected on the rocking arm 63 with compact configuration again.
In addition, variable air valve lift range mechanism 33 has crank part 68, and this crank part 68 is connecting the axial region 68c that board 68b two ends are provided with the 68a of rocking pin portion highlightedly and have the axis parallel with the 68a of this rocking pin portion.Because an axial region 68c is supported rotatably on the valve mechanism cover 16, therefore, by making the rotational of crank part 68, just can easily make the 68a of rocking pin portion displacement around an axial region 68c, by actuator motor 72, just can realize the mechanism of the 68a of rocking pin portion displacement is oversimplified.
And rocking arm 63 has: pair of bolts assembly department 63a, 63a, be used for screwing togather with adjusting bolt 70, make its advance and retreat position-adjustable, this adjust bolt 70 respectively with a pair of intake valve 19 butts; The the 1st and the 2nd supporting portion 63c, 63d, they connect an end of connecting rod 61 and lower link 62 rotationally, because this rocking arm 63 makes along one of the rotation axis direction of cam 69 distolateral width, promptly two bolt assembly department 63a, 63a be along the distance between the outer end of above-mentioned rotation axis, form greatlyyer than the width of other parts, therefore along on the rotation axis direction of cam 69, can reduce the width of rocking arm 63 as far as possible, thereby, also just can realize the miniaturization of valve device.In addition,, therefore, both can realize making the simple shapeization of rocking arm 63, can make its compactness again because rocking arm 63 makes the 1st to form identically with the width of the 2nd supporting portion 63c, 63d.
In addition, the 1st supporting portion 63c owing to being arranged on the rocking arm 63 forms the roughly U word shape from sandwich roller 65, and therefore roller 65, can be made the compact overall structureization of the rocking arm 63 that comprises roller 65 by the 1st supporting portion 63c rotatably support.And, because a end at last connecting rod 61, be provided with a pair of the 1st joint 61a from sandwich the 1st supporting portion 63c, two the 1st joint 61a are by upper pin 64, be rotatably connected on the 1st supporting portion 63c, roller 65 pivots by upper pin 64 and is supported on the 1st supporting portion 63c, therefore, with common upper pin 64, just can finish an end being rotatably connected of connecting rod 61 to the 1st supporting portion 63c, and the 1st supporting portion 63c the pivot of above-mentioned roller 65 is supported, when realizing reducing the component number, also can make valve device compactness more.
The the 1st and the 2nd supporting portion 63c at rocking arm 63, on the 63d, along two intake valves 19,19 on-off action direction, be provided with the 1st and the 2nd attachment hole 49 side by side, 50, it is used for inserting logical upper pin 64 and lower pin 66, this upper pin 64 is respectively applied for an end that is connected connecting rod 61 and lower link 62 rotationally with lower pin 66, since by with respect to the 1st and the 2nd attachment hole 49, the tangent tangent line L3 of outer rim of two intake valve 19 sides of 50, at least a portion is configured in the connecting wall 63e of a side opposite with two intake valves 19, with the 1st and the 2nd supporting portion 63c, couple together between 63d, therefore, can improve the 1st and the 2nd supporting portion 63c, the rigidity of 63d.
In addition, at the movable supporting portion 62b of the other end of lower link 62 under the state near rocking arm 63 sides, on connecting wall 63e, in the face of above-mentioned movable supporting portion 62b, form recess 51, just can make the movable supporting portion 62b of lower link 62, be displaced to as far as possible position near rocking arm 63 sides, thereby, both can make the valve device compactness, the maximum lift of intake valve 19,19 can be set as wide as possible again.
And then, owing on connecting wall 63e, be formed with lightening hole portion 52, therefore, the rigidity of connecting wall 63e was increased, the weight that can suppress rocking arm 63 again increases.
In addition, from oil injection nozzle 58, the end that to go up connecting rod 61 and lower link 62 is connected to the upper pin 64 of rocking arm 63 and the upper pin 64 supply machine oil of the top in the lower pin 66, machine oil after being lubricated between the last connecting rod 61 of top and the rocking arm 63 is flowed to the below, to being lubricated between the lower link 62 of below and the rocking arm 63.Thereby, with lubricating structure simple and that the component number has been reduced, just can lubricate the joint of rocking arm 63, last connecting rod 61 and lower link 62 simultaneously, can guarantee level and smooth valve actuation.
And, for form roughly the 1st supporting portion 63c of U word shape from sandwich roller 65, be set on the above-mentioned rocking arm 63, the 1st joint 61a of one end of last connecting rod 61 is by the upper pin 64 of pivot support rollers 65, be rotatably connected on the 1st supporting portion 63c, said engine oil nozzle 58 is mixed with towards the fitting surface of last connecting rod 61 and the 1st supporting portion 63c and supplies with machine oil, therefore, also can lubricate the pivot support portion of roller 65.
And then, owing on the lid 45 of intake cam support 46, be equipped with oil injection nozzle 58, above-mentioned intake cam support 46 rotates and is freely supporting the admission cam shaft 31 that is provided with cam 69, therefore, utilization is used for the oil circuit of 46 on lubricated admission cam shaft 31 and intake cam support, can supply with the abundant high pressure and the abundant machine oil of amount from oil injection nozzle 58.
And then variable air valve lift range mechanism 33 has crank part 68, and this crank part 68 is connecting the outstanding axial region 68c who is provided with the 68a of rocking pin portion and has the axis parallel with the 68a of this rocking pin portion in board 68b two ends.Propping up axial region 68c is supported rotatably on the valve mechanism cover 16, therefore, by making the rotational of crank part 68, just can easily make the 68a of rocking pin portion displacement around an axial region 68c, by actuator motor 72, just can realize the mechanism of the 68a of rocking pin portion displacement is oversimplified.
More than, embodiments of the invention are described in detail, but in the scope that does not break away from purport of the present invention, can be carried out all design alterations.
For example, in an embodiment, only variable air valve lift range mechanism 33 is applied on the intake valve 19,19, but also can only be applied on the exhaust valve 20,20, also can be applied to 19,19 liang of sides of intake valve 19,19 and intake valve.
Claims (3)
1. the valve device of a motor has and can make valve (19) lift amount continually varying variable air valve lift range mechanism (33), it is characterized in that,
Variable air valve lift range mechanism (33) has rocking arm (63) and two connecting rods (61 with valve (19) interlock, 62), these two connecting rods (61,62) can when being connected to this rocking arm (63), follow the motion of rocking arm (63) and swing, one of described connecting rod (62) pivots and is supported on the end (68a), this end (68a) can be swung according to the operating condition of motor, and can adjust the tappet clearance according to the variation of valve (19) lift amount.
2. engine valve transmission device as claimed in claim 1 is characterized in that,
Described rocking arm (63) has the valve abutting part (70) of the valve rod end of butt valve (19), and the cam abutting part (65) of butt valve driving cam (69);
The 1st connecting rod (61) of one of described two connecting rods, one end are pivoted at the 1st fulcrum (64) and are supported on the rocking arm (63), and the other end is pivoted at the 2nd fulcrum (67) and is supported on the engine body (29);
The 2nd connecting rod (62) of one of described two connecting rods, one end are pivoted at the 4th fulcrum (68a) and are supported on the engine body (16), and the other end is pivoted at the 3rd fulcrum (66) and is supported on the rocking arm (63); And
Crank part (68), it makes to pivot and supports the fulcrum (68a) of described the other end of at least one side's connecting rod (62) in the 1st, the 2nd connecting rod (61,62), and center on the axis (C2) of valve driving cam (69) shaft parallel and swing,
Crank part (68) is around the described axis (C2) of its swing, and the axis (C1) of the fulcrum (66) of a described end of the described at least one side's connecting rod of support (62) that is pivoted relative to each other forms eccentric (δ).
3. the engine valve transmission device described in claim 1 or 2 is characterized in that,
Reducing of the lift amount of corresponding valve (19) reduces the tappet clearance.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003157774 | 2003-06-03 | ||
| JP157774/2003 | 2003-06-03 | ||
| JP121181/2004 | 2004-04-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1798907A CN1798907A (en) | 2006-07-05 |
| CN100400804C true CN100400804C (en) | 2008-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800154540A Expired - Fee Related CN100400804C (en) | 2003-06-03 | 2004-05-28 | Valve-moving device for engine |
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| Country | Link |
|---|---|
| CN (1) | CN100400804C (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0565810A (en) * | 1991-09-06 | 1993-03-19 | Honda Motor Co Ltd | Tappet clearance adjusting method for engine |
| US5349929A (en) * | 1992-07-08 | 1994-09-27 | Honda Giken Kogyo Kabushiki Kaisha | Valve controller for controlling the suction valve of an internal-combustion engine |
| JPH08144718A (en) * | 1994-11-17 | 1996-06-04 | Toyota Motor Corp | Valve system for internal combustion engine |
| JPH1018824A (en) * | 1996-07-05 | 1998-01-20 | Yamaha Motor Co Ltd | Variable valve train for engine |
| US6085705A (en) * | 1997-12-11 | 2000-07-11 | Diesel Engine Retarders, Inc. | Variable lost motion valve actuator and method |
| JP2001027106A (en) * | 1999-07-15 | 2001-01-30 | Honda Motor Co Ltd | Tappet clearance adjusting method |
| CN1336481A (en) * | 2000-07-31 | 2002-02-20 | 丰田自动车株式会社 | Arrangement for controlling timing of the valve of internal combustion engine |
| US20020088415A1 (en) * | 2001-01-05 | 2002-07-11 | Pierik Ronald J. | Mechanical lash adjuster apparatus for an engine cam |
| JP2003120241A (en) * | 2001-10-09 | 2003-04-23 | Otics Corp | Variable valve system |
-
2004
- 2004-05-28 CN CNB2004800154540A patent/CN100400804C/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0565810A (en) * | 1991-09-06 | 1993-03-19 | Honda Motor Co Ltd | Tappet clearance adjusting method for engine |
| US5349929A (en) * | 1992-07-08 | 1994-09-27 | Honda Giken Kogyo Kabushiki Kaisha | Valve controller for controlling the suction valve of an internal-combustion engine |
| JPH08144718A (en) * | 1994-11-17 | 1996-06-04 | Toyota Motor Corp | Valve system for internal combustion engine |
| JPH1018824A (en) * | 1996-07-05 | 1998-01-20 | Yamaha Motor Co Ltd | Variable valve train for engine |
| US6085705A (en) * | 1997-12-11 | 2000-07-11 | Diesel Engine Retarders, Inc. | Variable lost motion valve actuator and method |
| JP2001027106A (en) * | 1999-07-15 | 2001-01-30 | Honda Motor Co Ltd | Tappet clearance adjusting method |
| CN1336481A (en) * | 2000-07-31 | 2002-02-20 | 丰田自动车株式会社 | Arrangement for controlling timing of the valve of internal combustion engine |
| US20020088415A1 (en) * | 2001-01-05 | 2002-07-11 | Pierik Ronald J. | Mechanical lash adjuster apparatus for an engine cam |
| JP2003120241A (en) * | 2001-10-09 | 2003-04-23 | Otics Corp | Variable valve system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1798907A (en) | 2006-07-05 |
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