CN100396891C - Valve operating device for engine - Google Patents
Valve operating device for engine Download PDFInfo
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- CN100396891C CN100396891C CNB2005800025474A CN200580002547A CN100396891C CN 100396891 C CN100396891 C CN 100396891C CN B2005800025474 A CNB2005800025474 A CN B2005800025474A CN 200580002547 A CN200580002547 A CN 200580002547A CN 100396891 C CN100396891 C CN 100396891C
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- rocking arm
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Abstract
A rocker arm (63) is provided with a valve connecting portion (63a) into which tappet screws (70) abutting against a pair of engine valves (19) are screwed so that their advance/retract positions can be adjusted, and the rocker arm (63) has a cam abutting portion (65) which abuts against a valve operating cam (69) and is interlocked and connected to the engine valves (19). The rocker arm (63) turnably connects to one end of a first link arm (61) turnably supported at a fixed position of an engine body and to one end of a second link arm turnably supported by a displaceable movable support shaft (68a). The rocker arm (63) is formed so that the valve connecting portion (63a) has a larger width in a direction along a rotating axis of the valve operating cam (69) than in the remaining part. This enables the lift amount of the engine valves to be continuously varied. It is also possible to reduce the size of the system, while ensuring follow-up ability of the opening/closing operations.
Description
Technical field
The present invention relates to a kind of valve device of motor, it has the lift amount continually varying lift changeable mechanism that makes as the engine valve of intake valve or exhaust valve.
Background technique
For the lift amount that makes engine valve infinitely changes, such valve device is disclosed in patent documentation 1: at a distolateral valve abutting part that has with the engine valve butt of rocking arm, the chimeric end that push rod (push rod) arranged in the other end of rocking arm is provided with linkage mechanism between the other end of push rod and valve driving cam.
But, in above-mentioned patent documentation 1 disclosed valve device, need between valve driving cam and rocking arm, guarantee to be used to dispose the bigger space of linkage mechanism and push rod, thereby valve device is maximized.And owing to be passed to rocking arm by linkage mechanism and push rod from the driving force of valve driving cam, thus rocking arm with respect to the followability of valve driving cam, be that the on-off action followability of engine valve is undesirable.
Therefore, the applicant has proposed the valve device of such motor in patent documentation 2: an end that is connected with first and second link arms on rocking arm rotationally, the other end rotatably support of first connecting rod arm is in engine main body, and the other end of second connecting rod arm is moved by driver element, can realize the miniaturization of valve device according to this valve device, and will directly be passed to rocking arm from the power of valve driving cam, and can guarantee good followability with respect to the valve driving cam.
Patent documentation 1: Japanese patent gazette spy opens flat 8-74534 number
Patent documentation 2: Japanese patent gazette spy opens 2004-36560 number
In addition, except needs make the valve device miniaturization, with the width along rotation axis of rocking arm set try one's best little also very important, yet when driving a pair of engine valve by single rocking arm and open, distance between two engine valves is decided by shape, the size of firing chamber basically, the width that is arranged at the valve joint of rocking arm in order to be connected with two valves is also determined according to the distance between two engine valves, therefore in order to reduce the described width of rocking arm as far as possible, it is desirable to when constituting rocking arm, make the width maximum of described valve joint.
Summary of the invention
The present invention be directed to the problems referred to above and propose, purpose is to provide a kind of valve device of motor, and it not only can make the lift amount of engine valve change continuously, can also realize miniaturization when guaranteeing the followability of on-off action.
To achieve these goals, the valve device of motor of the present invention, it first is characterised in that, comprising: rocking arm, it has the cam abutting part with valve driving cam butt, and this rocking arm is connected in linkage with engine valve; The first connecting rod arm, the one end is connected rotationally with this rocking arm, and its other end rotatably support is on the fixed position of engine main body; The second connecting rod arm, the one end is connected rotationally with described rocking arm, and its other end is by displaceable movable fulcrum rotatably support; And driver element, it is connected with movable fulcrum, can make the position change of described movable fulcrum, so that the lift amount of engine valve is changed continuously, described rocking arm comprises the valve joint and first and second supports, on described valve joint, be combined with to can regulate advance and retreat position adjusting screw with a pair of engine valve difference butt, described first and second supports are connected with an end of first and second link arms rotationally, and described rocking arm constitutes: described valve joint is at the width of the width on the direction of the spin axis of described valve driving cam greater than other parts.
The present invention is on the basis of the structure of first feature, second is characterised in that, the fulcrum rotatably support is passed through in abutment wall in the other end of described first connecting rod arm, this abutment wall is arranged at described engine main body in the mode of the both sides of the other end of being disposed at this first connecting rod arm, between the other end and described two abutment wall of first connecting rod arm, be fitted with the plug-in mounting thing respectively.
The present invention is on the basis of the structure of second feature, the 3rd is characterised in that, described plug-in mounting thing is the torsion spring that is arranged in such a way between engine main body and described rocking arm: to described rocking arm to a side application of force that makes described cam abutting part and described valve driving cam butt.
The present invention is on the basis of the structure of first feature, and the 4th is characterised in that, described first support forms roughly U word shape, and from the roller of sandwich as described cam abutting part, described roller is rotatably mounted by first support.
The present invention is on the basis of the structure of the 4th feature, the 5th is characterised in that, on an end of first connecting rod arm, be provided with a pair of joint, this a pair of joint is from first support of the described rocking arm of sandwich, two joints are connected with first support rotationally by coupling shaft, and described roller is supported on described first support by described coupling shaft axle.
The present invention is on the basis of the structure of first feature, and the 6th is characterised in that, described rocking arm forms and makes the width of first and second supports identical.
The present invention is on the basis of the structure of first feature, the 7th is characterised in that, first support is provided with first attachment hole and second support is provided with second attachment hole, the relative position of described first attachment hole and second attachment hole is arranged along the on-off action direction of described two engine valves, be penetrated with coupling shaft in this attachment hole, described coupling shaft is applied to respectively be connected with an end of first and second link arms rotationally, with respect to the tangent tangent line of outer rim at described two engine air reveals and two attachment holes, in a side opposite with described two engine valves, dispose at least a portion of connecting wall, couple together by this connecting wall between first and second supports.
The present invention is on the basis of the structure of the 7th feature, the 8th is characterised in that, is being formed with recess on such position of described connecting wall: in the other end of described second connecting rod arm under the state near the rocking arm side, with the opposed position, the other end of described second connecting rod arm.
The present invention is on the basis of the structure of the 7th feature, and the 9th is characterised in that, is formed with weight saving portion on described connecting wall.
The present invention is on the basis of the structure of first feature, and the tenth is characterised in that, is formed with weight saving portion interlaced with each other on the upper and lower surface of the opposition side each other of formed in mould rocking arm.
According to first feature, can the lift amount of engine valve be changed continuously by making the stepless displacement of movable fulcrum, and an end of first and second link arms directly is connected rotationally with rocking arm, thereby the space that can reduce to dispose two link arms, thereby can realize the miniaturization of valve device, owing to directly be passed to the cam abutting part of rocking arm from the power of valve driving cam, so can guarantee good followability with respect to the valve driving cam.And; rocking arm drives a pair of engine valve and opens and closes; rocking arm has the valve joint and first and second supports; ground, can regulate advance and retreat position is combined with the adjusting screw of distinguishing butt with two valves on the valve joint; first and second supports are connected with an end of first and second link arms rotationally; and this rocking arm constitutes: the valve joint is at the width of the width on the direction of the spin axis of valve driving cam greater than other parts; therefore; can reduce rocking arm at the width on the direction of the spin axis of valve driving cam as far as possible, thereby can realize the miniaturization of valve device.
According to second feature, abutment wall is arranged on the engine main body in the mode of the both sides of the other end of being disposed at the first connecting rod arm, and between the other end of first connecting rod arm and this abutment wall, be fitted with the plug-in mounting thing, therefore by selecting the plug-in mounting thing, can absorb tolerance of size between first connecting rod arm and two abutment wall by the plug-in mounting thing, thereby make the location of first connecting rod arm become easy.
According to the 3rd feature, by with to rocking arm to the torsion spring of the direction application of force that makes cam abutting part and valve driving cam butt as described plug-in mounting thing, can easily absorb described tolerance of size, and can make cam abutting part and valve driving cam butt reliably, thereby can improve the control accuracy of valve lift amount.
According to the 4th feature,, can make the rocking arm overall structure miniaturization that comprises roller by forming the roughly rotatably mounted roller of first support of U word shape.
According to the 5th feature, one end of realizing the first connecting rod arm by common coupling shaft is connected with the rotating of first support, and described first support can reduce number of components, and can make the further miniaturization of valve device the axle supporting of described roller.
According to the 6th feature,, the rocking arm shape is simplified, and realized miniaturization because the width of first and second supports is identical.
According to the 7th feature; first and second supports of rocking arm are connected to each other by connecting wall; and described connecting wall is arranged to: with respect to be arranged on a pair of attachment hole on two supports at the tangent tangent line of the outer rim of engine air reveal; in a side opposite; be provided with at least a portion of this connecting wall, therefore can improve the rigidity of first and second supports with engine valve.
According to the 8th feature, can make the other end of second connecting rod arm be displaced to the position of as far as possible close rocking arm side, thereby can realize the miniaturization of valve device, and can set the maximum lift of engine valve big as much as possible.
According to the 9th feature, can improve the rigidity of rocking arm by connecting wall, and suppress the increase of rocking arm weight.
According to the tenth feature,, can make the rocking arm lightweight by on the upper and lower surface of the opposition side each other of rocking arm, alternately forming weight saving portion.And, when the rocking arm mould-forming, also form each weight saving portion, because making the pattern draft of weight saving portion adjacent one another are is opposite direction each other, therefore the inner side surface of weight saving portion adjacent one another are tilts in the same direction, thereby between weight saving portion adjacent one another are, the thickness of arm that is formed at rocking arm is roughly even, by thickness roughly uniformly wall portion can keep the rigidity of rocking arm.
Description of drawings
Fig. 1 is the partial longitudinal section figure of first embodiment's motor, is the sectional view (embodiment 1) along the 1-1 line among Fig. 2.
Fig. 2 is the sectional view along the 2-2 line among Fig. 1.(embodiment 1)
Fig. 3 is the view along the direction of the 3-3 line among Fig. 2.(embodiment 1)
Fig. 4 is the side view of lift changeable mechanism.(embodiment 1)
Fig. 5 is the exploded perspective view of lift changeable mechanism.(embodiment 1)
Fig. 6 is the amplification sectional view along the 6-6 line among Fig. 4.(embodiment 1)
Fig. 7 is the view along the direction of the arrow among Fig. 37.(embodiment 1)
Fig. 8 A is the Action Specification figure of the lift changeable mechanism of valve lift when big.(embodiment 1)
Fig. 8 B is the Action Specification figure of valve lift lift changeable mechanism hour.(embodiment 1)
Fig. 9 is the figure of the lifting curve of expression engine valve.(embodiment 1)
Figure 10 is the major component enlarged view of Fig. 3.(embodiment 1)
Figure 11 is the plotted curve of the relation between expression control arm corner and the sensor arm corner.(embodiment 1)
Figure 12 is the partial longitudinal section figure of second embodiment's motor, is the sectional view along the 12-12 line among Figure 13.(embodiment 2)
Figure 13 is the view along the direction of the arrow among Figure 12 13.(embodiment 2)
Figure 14 is the sectional view along the 14-14 line among Figure 13.(embodiment 2)
Figure 15 is the major component enlarged view along Figure 12.(embodiment 2)
Figure 16 is the worm's eye view that the direction of the arrow 16 from Figure 15 is observed air inlet side rocking arm.(embodiment 2)
Figure 17 is the sectional view along the 17-17 line among Figure 15.(embodiment 2)
Figure 18 is the stereogram of lift changeable mechanism.(embodiment 2)
Figure 19 is the sectional view along the 19-19 line among Figure 15.(embodiment 2)
Label declaration
10: engine main body; 19: as the intake valve of engine valve; 44a: abutment wall; 49,50: attachment hole; 51: recess; 52,117,118: weight saving portion; 54,122: as the torsion spring of plug-in mounting thing; 61,112: the first connecting rod arm; 61a, 112a: joint; 62,113: the second connecting rod arm; 63,111: rocking arm; 63a, 111a: valve joint; 63b, 111b: first support; 63c, 111c: second support; 63d: connecting wall; 64,66: coupling shaft; 65,114: as the roller of cam abutting part; 67,119: fulcrum; 68a, 134: movable fulcrum; 69: the valve driving cam; 70: adjusting screw; 72: as the actuator motor of drive unit; E: motor; L: tangent line.
Embodiment
Below, the embodiments of the invention shown in describe embodiments of the present invention with reference to the accompanying drawings.
Fig. 1～Figure 11 represents the first embodiment of the present invention.
At first in Fig. 1, the engine main body 10 of the motor E of multi cylinder in upright arrangement comprises: cylinder block 12, and its inside is provided with cylinder thorax 11; Cylinder head 14, its end face with cylinder block 12 engages; Valve mechanism cover 16, its end face with cylinder head 14 engages, and in each cylinder thorax 11, chimeric slidably have a piston 13, and the firing chamber 15 right with the top surface of each piston 13 is formed between cylinder block 12 and the cylinder head 14.
On cylinder head 14, be provided with the suction port 17 and the relief opening 18 that can be communicated with each firing chamber 15, each suction port 17 is opened and closed respectively by a pair of intake valve 19 as engine valve, and each relief opening 18 is opened and closed respectively by a pair of exhaust valve 20.The push rod 19a of intake valve 19 is entrenched in the conduit 21 of being located at cylinder head 14 slidably, by at spring seat 22 and be connected to the valve spring 24 that is provided with between the spring seat 23 on the cylinder head 14, each intake valve 19 is subjected to the active force to the direction of closing valve, and wherein said spring seat 22 is arranged at the upper end portion of push rod 19a.In addition, the push rod 20a of each exhaust valve 20, be entrenched in slidably in the conduit 25 of being located at cylinder head 14, by at spring seat 26 and be connected to the valve spring 28 that is provided with between the spring seat 27 on the cylinder head 14, each exhaust valve 20 is subjected to the active force to the direction of cutting out valve, wherein, spring seat 26 is arranged at the upper end portion of push rod 20a.
In the lump with reference to Fig. 2, on cylinder head 14, be provided with supporting member 44 integratedly, it has the abutment wall 44a that is configured in each cylinder both sides, engaging on each abutment wall 44a has end cap 45,47, end cap 45,47 collaborative formation intake cam supporting member 46 and exhaust cam supporting members 48.So, on intake cam supporting member 46, rotatably mounted have an admission cam shaft 31, on exhaust cam supporting member 48, rotatably mounted have an exhaust cam shaft 32, intake valve 19 is driven by lift changeable mechanism 33 by admission cam shaft 31, and exhaust valve 20 is driven by lift-timing changeable mechanism 34 by exhaust cam shaft 32.
Lift-timing the changeable mechanism 34 that drives exhaust valve 20 is known for everyone, and its summary is described herein.Exhaust rocker arm axle 35 is supported by the abutment wall 44a in the exhaust cam supporting member 48, on this exhaust rocker arm axle 35, pivot suspension has the end of a pair of low speed with rocking arm 36,36, and single high speed is used an end of rocking arm 37, two low speed that are arranged on the exhaust cam shaft 32 are bearing in low speed with roller 38,38 butts on the intermediate portion of rocking arm 36,36 with cam 39,39 and axle, and the high speed that is arranged on the exhaust cam shaft 32 is bearing in roller 40 butts of using at a high speed on the intermediate portion of rocking arm 37 with cam 41 and axle.In addition, with the adjusting screw 42 of the upper end butt of the push rod 20a of exhaust valve 20, ground, can regulate advance and retreat position screws the other end at low speed usefulness rocking arm 36,36.
And, two low speed are with rocking arm 36,36 and use rocking arm 37 to control by oil pressure at a high speed, can switch to connect and be connected with removing, when motor E low-speed running, when remove low speed with rocking arm 36,36 with at a high speed with being connected of rocking arm 37 time, low speed drives with cam 39,39 with the low speed of rocking arm 36,36 by correspondence, and exhaust valve 20 opens and closes with low lift, low angle of release.In addition, when motor E runs up, when low speed is coupled together with rocking arm 37 with rocking arm 36,36 and high speed, drive with cam 41 with the high speed of rocking arm 37 at a high speed by correspondence, by with the low speed usefulness rocking arm 36,36 that engages at a high speed with rocking arm 37, exhaust valve 20 opens and closes with high lift, high angle of release.Like this, by lift-timing changeable mechanism 34, divide the lift and the timing of two-stage control exhaust valve 20.
Next, in the lump with reference to Fig. 3～Fig. 7, and simultaneously the structure of lift changeable mechanism 33 is described, this lift changeable mechanism 33 comprises: air inlet side rocking arm 63, it has the roller 65 as the cam abutting part, this roller 65 and air inlet side valve driving cam 69 butts that are arranged on the admission cam shaft 31; First connecting rod arm 61, the one end is connected rotationally with this air inlet side rocking arm 63, and its other end is rotatably supported on the fixed position of engine main body 10; Second connecting rod arm 62, the one end is connected rotationally with above-mentioned air inlet side rocking arm 63, and its other end is rotatably supported on the displaceable movable fulcrum 68a.
Be provided with valve joint 63a in an end of air inlet side rocking arm 63, be combined with to can regulate advance and retreat position adjusting screw 70,70, the upper end butt of the push rod 19a of this adjusting screw 70,70 from top and a pair of intake valve 19 on it.In addition, the other end of air inlet side rocking arm 63 forms to the unlimited roughly U word shape of the opposition side of intake valve 19, on the other end of air inlet side rocking arm 63, be provided with: the first support 63b, its end with first connecting rod arm 61 is pivotally connected on the other end of air inlet side rocking arm 63; The second support 63c, its end with second connecting rod arm 62 is pivotally connected on the other end of air inlet side rocking arm 63, and the second support 63c is configured in the below of the first support 63b.And, be configured to by the roughly first support 63b clamping of U word shape with the air inlet side valve driving cam 69 of admission cam shaft 31 roller 65 that contacts that rolls, and the coaxial earth's axis of an end joint of roller 65 and first connecting rod arm 61 is bearing on the first support 63b.
In addition, air inlet side rocking arm 63 forms on the direction of the rotation axis of air inlet side valve driving cam 69, and the width of above-mentioned valve joint 63a is greater than the width of other parts, and the width of the first and second support 63b, 63c forms identical width.
First connecting rod arm 61 roughly forms U word shape, and it has: a pair of first joint 61a, 61a, from sandwich air inlet side rocking arm 63; The fixed bearing 61b of portion cylindraceous; A pair of arm 61c, 61c connect between two first joint 61a, 61a and the 61b of fixed bearing portion.
The first joint 61a, the 61a of one end of first connecting rod arm 61, by first coupling shaft 64 cylindraceous, be connected rotationally with the first support 63b of the other end of above-mentioned air inlet side rocking arm 63, first coupling shaft 64 runs through and is fixed in first attachment hole 49 on the first support 63b that is located at air inlet side rocking arm 63, and above-mentioned roller 65 also is bearing on the first support 63b by 64 of first coupling shafts.In addition, among the first support 63b and outer side surfaces above-mentioned admission cam shaft 31 opposed parts, with first connecting rod arm 61 in the first joint 61a, the outer side surface of 61a, the axis that forms with first coupling shaft 64 is the circular-arc of center, and becomes overlapping state when observing from the side.
Be configured in the second connecting rod arm 62 of first connecting rod arm 61 belows, have the second joint 62a in the one end, and have the 62b of movable support portion in its other end, the second joint 62a is configured to by forming the roughly second support 63c clamping of U word shape.The second support 63c is provided with second attachment hole 50, first attachment hole 49 of this second attachment hole 50 and the first support 63b, on-off action direction along above-mentioned two intake valves 19 is that above-below direction is arranged, the second joint 62a is connected with the second support 63c rotationally by running through and being fixed on second coupling shaft 66 in second attachment hole 50.
Promptly, air inlet side rocking arm 63 has above-mentioned roller 65 with air inlet side valve driving cam 69 butts at the other end upper lateral part, one end of this air inlet side rocking arm 63 is connected in linkage with a pair of intake valve 19, the first joint 61a, 61a that the first connecting rod arm 61 of top is had in the one end, the second joint 62a with the second connecting rod arm 62 that is disposed at first connecting rod arm 61 belows is had in the one end is connected with the other end of rocking arm 63 up and down side by side and rotatably.
In addition, be provided with a pair of connecting wall 63d integratedly on described air inlet side rocking arm 63, described a pair of connecting wall 63d connects between the first and second support 63b, the 63c of U word shape roughly.And, connecting wall 63d forms: with respect to the tangent tangent line L of outer rim at above-mentioned two intake valve 19 sides and first and second attachment holes 49,50, at least a portion of connecting wall 63d is configured in a side opposite with above-mentioned two intake valves 19, and this connecting wall 63d connects between the first and second support 63b, the 63c.
In addition, be formed with recess 51 on connecting wall 63d, this recess 51 is disposed at such position: the 62b of movable support portion of the other end of second connecting rod arm 62 near the state of air inlet side rocking arm 63 sides under with the movable opposed position of fulcrum 68a.In addition, on above-mentioned connecting wall 63d, for example be formed with from the weight saving portion 52 that outer side surface caves in to the inside.
The 61b of fixed bearing portion of the other end of first connecting rod arm 61, be rotatably supported on the abutment wall 44a by a fixed pivot axis 67, described abutment wall 44a is arranged at the intake cam supporting member 46 of engine main body 10 with formation the mode of bottom is configured in the both sides of the described fixed bearing 61b of portion, and a fixed pivot axis 67 is fixedly attached to described two abutment wall 44a.
Pay special attention to Fig. 6, on above-mentioned abutment wall 44a, give prominence to integratedly and be provided with a pair of supporting convex 53,53, described supporting convex 53,53 is side-prominent to the 61b of fixed bearing portion of first connecting rod arm 61.These supporting convex 53 are provided with: can with the minor diameter axial region 53a of the both ends of the surface sliding contact of said fixing support 61b, and end difference 53b, this end difference 53b surrounds the base end part of minor diameter axial region 53a, and devices spaced apart ground is opposed on the both ends of the surface of the 61b of fixed bearing portion, a fixed pivot axis 67 is fixedly supported upon on the supporting convex 53, and runs through minor diameter axial region 53a coaxially with minor diameter axial region 53a.
In addition, two intake valves 19 apply elastic force by valve spring 24 to the direction of closing valve, when driving by when the direction of closing valve applies two intake valves 19 of elastic force to the direction of opening valve by air inlet side rocking arm 63, the roller 65 of air inlet side rocking arm 63 is by the effect of valve spring 24, with air inlet side valve driving cam 69 butts, but under the closed condition of intake valve 19, the elastic force of valve spring 24 does not act on the air inlet side rocking arm 63, roller 65 leaves air inlet side valve driving cam 69 thus, when intake valve 19 is opened slightly, there is the possibility of the control accuracy reduction of valve lift amount.Therefore, torsion spring 54 is set outside valve spring 24 separately, this torsion spring 54 be plugged in first connecting rod arm 61 the other end the 61b of fixed bearing portion two the surface and supporting convex 53 between the plug-in mounting thing, described supporting convex 53 outstanding being arranged on the abutment wall 44a of the both sides of the 61b of fixed bearing portion configuration, by this torsion spring 54, air inlet side rocking arm 63 quilts are to the direction application of force that makes described roller 65 with air inlet side valve driving cam 69 butts.
Described torsion spring 54 is configured to center on described a fixed pivot axis 67 by the minor diameter axial region 53a of described supporting convex 53, and described torsion spring 54 is arranged between engine main body 10 and the air inlet side rocking arm 63.An end that promptly centers on the torsion spring 54 of described minor diameter axial region 53a engages with fastening pin 55, and the other end of torsion spring 54 inserts and is fastened in first coupling shaft 64 of the hollow of moving integratedly with air inlet side rocking arm 63, and described fastening pin 55 is embedded in the end difference 53b of described supporting convex 53.
In addition, the 61b of fixed bearing portion of the other end of first connecting rod arm 61 forms cylindric, the periphery of the 61b of fixed bearing portion is configured in the inboard of the periphery that is wound into spiral helicine described torsion spring 54 when side-looking, axial two end part at the 61b of fixed bearing portion, give prominence to along the circumferentially spaced compartment of terrain respectively and be provided with a plurality of for example a pair of protuberances 56,57, described protuberance 56,57 is used to stop torsion spring 54 to swing to the 61b of fixed bearing portion side, and the actuating range that these protuberances 56,57 are avoided second connecting rod arm 62 is configured.
Fixed configurations has the oil ejector 58 as oily feed unit on engine main body 10, first and second coupling shafts 64,66 are with the first joint 61a and the second joint 62a of an end of first and second link arms 61,62, be connected to the other end of air inlet side rocking arm 63, and first and second coupling shafts 64,66 are configured on the position arranged side by side up and down, the coupling shaft fuel feeding of the top of oil ejector 58 in first and second coupling shafts 64,66.In the present embodiment, first coupling shaft, 64 fuel feeding of the coupling shaft of the conduct top of oil ejector 58 in first and second coupling shafts 64,66, this oil ejector 58 are fixedly mounted on the end cap 45 in the intake cam supporting member 46 that is arranged on the engine main body 10.
And, another distolateral top at air inlet side rocking arm 63, be provided with the first support 63b, this first support 63b forms roughly U word shape, and from sandwich roller 65, the first joint 61a of one end of first connecting rod arm 61, support first coupling shaft 64 of above-mentioned roller 65 by axle, be connected rotationally with the first support 63b, above-mentioned oil ejector 58 is provided on the above-mentioned end cap 45, and towards first joint 61a of first connecting rod arm 61 and the faying surface fuel feeding of the first support 63b.
Like this, when air inlet side rocking arm 63 is in lifting position shown in Figure 4, that is intake valve 19 is when being in closed condition, on the axis C of second coupling shaft 66 of the bottom of pivot suspension air inlet side rocking arm 63, dispose the fulcrum 68c (with reference to Fig. 5) of crank part 68 coaxially, thereby when crank part 68 during around the swing of the axis of fulcrum 68c, movable fulcrum 68a just goes up mobile at the circular arc A (with reference to Fig. 4) that with fulcrum 68c is the center.
The fulcrum 68c of above-mentioned crank part 68, outstanding from the bearing hole 16a of valve mechanism cover 16, be fixed with control arm 71 at the end of this fulcrum 68c, this control arm 71 by on the outer wall that is installed in cylinder head 14, drive as the actuator motor 72 of driver element.That is, on the lead screw shaft 73 by 72 rotations of actuator motor, be engaged with nut part 74, an end that links connecting rod 76 passes through pin 75 pivot suspensions on nut part 74, and this other end that links connecting rod 76 is connected with control arm 71 by pin 77,77.Thereby, when making 72 work of actuator motor, nut part 74 moves along the lead screw shaft 73 of rotation, by the control arm 71 that is connected with nut part 74 through binding connecting rod 76, crank part 68 is swung around fulcrum 68c, thus, mobile between the position of movable fulcrum 68a in Fig. 8 A and the position among Fig. 8 B.
The outer wall of valve mechanism cover 16 is provided with for example such rotation angle sensor 80 of rotating coder, is fixed with an end of sensor arm 81 at the end of its sensor axis 80a.On control arm 71, be formed with along the guide groove 82 of the linearly extension of its length direction the chimeric slidably coupling shaft 83 that the other end of sensor arm of being arranged at 81 is arranged in this guide groove 82.
Lead screw shaft 73, nut part 74, pin 75 links connecting rod 76, pin 77,77, control arm 71, rotation angle sensor 80, sensor arm 81, and coupling shaft 83, be contained in from the outstanding 14a of wall portion in the side of cylinder head 14 and valve mechanism cover 16, the inboard of 16b, the lid 78 of the end face of the 14a of covering wall portion, 16b is fixed on the 14a of wall portion, the 16b by bolt 79.
In described lift changeable mechanism 33, when make the solid line position of control arm 71 from Fig. 3 when counter clockwise direction is rotated by actuator motor 72, the crank part 68 (with reference to Fig. 5) that is connected with control arm 71 is to counterclockwise rotating, shown in Fig. 8 A, the movable fulcrum 68a of crank part 68 rises.Under this state, when by air inlet side valve driving cam 69 press-on roller 65 of admission cam shaft 31, the four joint connecting rods that are connected and fixed fulcrum 67, first coupling shaft 64, second coupling shaft 66 and movable fulcrum 68a produce distortion, air inlet side rocking arm 63 is swung towards the below to solid line position from the dot and dash line position, adjusting screw 70,70 is pushed the push rod 19a of intake valve 19, thereby opens intake valve 19 with high lift.
When by actuator motor 72, when making control arm 71 turn to solid line position among Fig. 3, the crank part 68 that is connected with control arm 71 rotates to clockwise direction, shown in Fig. 8 B, and the movable fulcrum 68a decline of crank part 68.Under this state, when by air inlet side valve driving cam 69 press-on roller 65 of admission cam shaft 31, above-mentioned four joint connecting rods produce distortion, air inlet side rocking arm 63 is swung towards the below to solid line position from the dot and dash line position, adjusting screw 70,70 is pushed the push rod 19a of intake valve 19, thereby opens intake valve 19 with low lift.
Fig. 9 represents the lifting curve of intake valve 19, and angle of release during with the corresponding high lift of Fig. 8 A and the angle of release during with the corresponding low lift of Fig. 8 B are identical, have only lift amount to change.Like this, by lift changeable mechanism 33 is set, under the situation of the angle of release that does not change intake valve 19, can at random change lift amount.
In addition, make crank part 68 swing by actuator motor 72, during with the lift of change intake valve 19, must detect the size of lift, that is detect the corner of the fulcrum 68c of crank part 68, and it is fed back in the control of actuator motor 72.For this reason, detect the corner of the fulcrum 68c of crank part 68 with rotation angle sensor 80.If only detect the corner of the fulcrum 68c of crank part 68, then, goes up by rotation angle sensor as long as being directly connected to above-mentioned fulcrum 68c, but because in the zone of hanging down lift, lift amount only changes slightly, intake efficiency will great changes will take place, therefore, must detect the corner of the fulcrum 68c of crank part 68 accurately, and it is fed back in the control of actuator motor 72.With respect to this, in the zone of high lift, even some variations take place lift amount, intake efficiency can great changes will take place yet, therefore, to the detection of above-mentioned corner, not exigent precision.
The position of the control arm of representing with solid line in Figure 10 71 is corresponding to the zone of low lift, from the position of this control arm of swinging in the counterclockwise direction of representing with dot and dash line 71, corresponding to the zone of high lift.Zone in low lift, coupling shaft 83 owing to the sensor arm 81 on the sensor axis 80a that is fixed on rotation angle sensor 80, engage with the end side (away from the side of axis C) of the guide groove 82 of control arm 71, therefore, as long as control arm 71 is swung slightly, sensor arm 81 will produce very big swing.That is the corner of sensor axis 80a is very big with respect to the ratio of the corner of crank part 68, the resolution height of rotation angle sensor 80, thus can detect the corner of crank part 68 accurately.
On the other hand, swing to the zone of the high lift of the position of representing with dot and dash line at control arm 71, coupling shaft 83 owing to the sensor arm 81 on the sensor axis 80a that is fixed on rotation angle sensor 80, engage with the terminal side (near the side of axis C) of the guide groove 82 of control arm 71, therefore, even control arm 71 produces very big swing, sensor arm 81 is just swing slightly also.That is the corner of sensor axis 80a is little with respect to the ratio of the corner of crank part 68, the testing precision of the corner of crank part 68 step-down during than low lift.
Shown in the plotted curve of Figure 11 like that, as can be known: when the corner of control arm 71 from low lift state when the high lift state increases, owing to the angle increment rate of sensor arm 81 the most at the beginning is very high, therefore testing precision uprises, little by little, above-mentioned increment rate step-down, its testing precision is step-down also.
Like this, even do not use the expensive high rotation angle sensor of testing precision, be fastened on by the sensor arm 81 that makes rotation angle sensor 80 in the guide groove 82 of control arm 71, just can guarantee in the testing precision that needs under the low lift state of high measurement accuracy, and can help to reduce cost.
At this moment, make one distolateral (near the side of fulcrum 68c) and the approaching mutually configuration of one distolateral (near a side of rotation angle sensor 80) of sensor arm 81 of control arm 71, distolateral guide groove 82 that is formed with at control arm 71, therefore, the length of sensor arm 81 can be shortened, miniaturization can be realized.In addition, if a distolateral formation guide groove 82 at control arm 71, then the distance from axis C diminishes, the amount of movement along the circumferential direction of guide groove 82 also diminishes, but because the shorten length of sensor arm 81, therefore, the corner of sensor arm 81 can be fully guaranteed, the testing precision of rotation angle sensor 80 can be guaranteed.
Next, effect to this first mode of execution describes, lift changeable mechanism 33 is used to make the lift amount of opening valve of intake valve 19 to change continuously, in this lift changeable mechanism 33, first and second link arms 61,62 have the first and second joint 61a in the one end, 61a, 62a, air inlet side rocking arm 63 has the valve joint 63a that is connected in linkage with a pair of intake valve 19 in the one end, the first and second joint 61a, 61a, 62a is connected side by side and rotatably with the other end of air inlet side rocking arm 63, the 61b of fixed bearing portion of the other end of first connecting rod arm 61, be rotatably supported on a fixed pivot axis 67 by engine main body 10 supportings, the 62b of movable support portion of the other end of second connecting rod arm 62 is supported rotationally by displaceable movable fulcrum 68a.
Thereby, by making the stepless displacement of movable fulcrum 68a, can make the stepless variation of lift amount of intake valve 19, and, one end of first and second link arms 61,62 directly is connected rotationally with air inlet side rocking arm 63, can reduce to dispose the space of two link arms 61,62, can realize the miniaturization of valve device, because the power from air inlet side valve driving cam 69 directly is passed on the roller 65 of air inlet side rocking arm 63, therefore, can guarantee good followability with respect to air inlet side valve driving cam 69.In addition, can with air inlet side rocking arm 63, first and second link arms 61,62 along the position configuration on the axial direction of admission cam shaft 31 in essentially identical position, thereby can realize that valve device is along the miniaturization on the axial direction of admission cam shaft 31.
And air inlet side rocking arm 63 has: valve joint 63a is combined with respectively the adjusting screw 70 with a pair of intake valve 19 butts, and can regulates the advance and retreat position of this adjusting screw 70 on it; The first and second support 63b, 63c, they connect an end of first and second link arms 61,62 rotationally, this air inlet side rocking arm 63 forms and makes along the width of the valve joint 63a on the direction of the rotation axis of air inlet side valve driving cam 69 width greater than other parts, therefore, can reduce air inlet side rocking arm 63 as much as possible along the width on the direction of the spin axis of air inlet side valve driving cam 69, thereby, also just can realize the miniaturization of valve device.In addition,, therefore, both can realize the simplification of the shape of air inlet side rocking arm 63, can make 63 miniaturizations of air inlet side rocking arm again because air inlet side rocking arm 63 makes the width of the first and second support 63b, 63c form identical width.
In addition, be arranged at the first support 63b of air inlet side rocking arm 63, form roughly U word shape, and clip roller 65 from both sides, roller 65 is rotatably supported on the first support 63b, therefore, can constitute air inlet side rocking arm 63 integral body that comprise roller 65 small-sizedly.And, end at first connecting rod arm 61, be provided with a pair of first joint 61a that clips the first support 63b from both sides, and two first joint 61a are connected with the first support 63b rotationally by first coupling shaft 64, roller 65 is bearing on the first support 63b by 64 of first coupling shafts, therefore, one end of realizing first connecting rod arm 61 by the first common coupling shaft 64 is connected with first the rotating of support 63b, and the axle supporting of above-mentioned roller 65 on the first support 63b, thereby, when realizing that components number reduces, can make the further miniaturization of valve device.
The first and second support 63b at air inlet side rocking arm 63, on the 63c, on-off action direction along two intake valves 19 is provided with first and second attachment holes 49 side by side, 50, at this first and second attachment hole 49, be penetrated with first and second coupling shafts 64 in 50,66, first and second coupling shafts 64,66 are used for respectively with first and second link arms 61, an end of 62 is pivotally connected to the first and second support 63b, on the 63c, connecting wall 63d is arranged to: with respect at two intake valve 19 sides and first and second attachment holes 49, the tangent line L that 50 outer rim is tangent, at least a portion of connecting wall 63d is configured in a side opposite with two intake valves 19, by this connecting wall 63d first and second support 63b, be connected between the 63c, therefore, can improve the first and second support 63b, the rigidity of 63c.
In addition, on connecting wall 63d, be formed with recess 51, recess 51 is at the 62b of movable support portion of the other end of second connecting rod arm 62 under the state near air inlet side rocking arm 63 sides, opposed with the above-mentioned movable support 62b of portion, can make the 62b of movable support portion of second connecting rod arm 62 be displaced to as much as possible position near air inlet side rocking arm 63 sides, thereby, both can make the valve device miniaturization, can set the maximum lift of intake valve 19 greatly as much as possible again.
In addition,, therefore can improve rigidity, and the weight of inhibition air inlet side rocking arm 63 increases by connecting wall 63d owing on connecting wall 63d, be formed with weight saving portion 52.
First and second coupling shafts 64,66 are connected to an end of first and second link arms 61,62 on the air inlet side rocking arm 63, first coupling shaft, the 64 side fuel feeding of the top of oil ejector 58 in first and second coupling shafts 64,66, and these oil ejector 58 fixed configurations are on engine main body 10, oil after being lubricated between the first connecting rod arm 61 of the top in first and second link arms 61,62 and the air inlet side rocking arm 63 is flowed to the below, thereby to being lubricated between the second connecting rod arm 62 of below and the air inlet side rocking arm 63.Thereby, can the joint of air inlet side rocking arm 63 with first and second link arms 61,62 be lubricated by simple and the few lubricating structure of components number, can guarantee valve actuation smoothly.
And, form the roughly first support 63b of U word shape, clip roller 65 from both sides, and be arranged on the above-mentioned air inlet side rocking arm 63 the first joint 61a of an end of first connecting rod arm 61, first coupling shaft 64 by axle supporting roller 65, be connected rotationally with the first support 63b, above-mentioned oil ejector 58 is provided on the engine main body 10, and towards the faying surface fuel feeding of the first connecting rod arm 61 and the first support 63b, therefore, can also lubricate the axle support of roller 65.
Because oil ejector 58 is provided on the end cap 45 of intake cam supporting member 46 that mode with rotatably mounted admission cam shaft 31 is arranged at engine main body 10, therefore, can utilize and be used for the oil circuit that is lubricated between admission cam shaft 31 and the intake cam supporting member 46, from the oil that oil ejector 58 is supplied with abundant high pressure and fully measured, wherein above-mentioned admission cam shaft 31 is provided with air inlet side valve driving cam 69.
In addition, intake valve 19 by valve spring 24 to the direction application of force of closing valve, but air inlet side rocking arm 63 is by the torsion spring 54 different with valve spring 24, quilt is to the direction application of force that makes roller 65 with air inlet side valve driving cam 69 butts, therefore, even under intake valve 19 closing state, the roller 65 of air inlet side rocking arm 63 can not leave air inlet side valve driving cam 69 yet, the control accuracy of the valve lift amount in the time of can improving intake valve 19 and open slightly.
And, the a pair of supporting convex 53 of supporting a fixed pivot axis 67,53, be arranged in mode on the abutment wall 44a of intake cam supporting member 46 of engine main body 10 from the other end of sandwich first connecting rod arm 61, and torsion spring 54 is to center on two supporting convex 53,53 mode is plugged between the other end of the abutment wall 44a of engine main body 10 and first connecting rod arm 61, therefore, absorb tolerance of size between first connecting rod arm 61 and the two abutment wall 44a by torsion spring 54, it is easy that the location of first connecting rod arm 61 becomes, and, by a pair of supporting convex 53,53 limit the moving of the 61b of fixed bearing portion of the other end of first connecting rod arm 61, and can make torsion spring 54 be compact configuration, and the influence that can avoid being produced by the contraction of torsion spring 54 feed through to a fixed pivot axis 67.
The other end at first connecting rod arm 61, be provided with the fixed bearing 61b of portion cylindraceous, when observing from the side, the periphery of the 61b of fixed bearing portion is configured in the inboard of the periphery of torsion spring 54, the 61b of this fixed bearing portion is by a fixed pivot axis 67 rotatably supports, but at the axial two end part of the 61b of fixed bearing portion, give prominence to along the circumferentially spaced compartment of terrain respectively and be provided with a plurality of protuberances 56,57, described a plurality of protuberances 56,57 are used to stop above-mentioned torsion spring 54 to swing to the 61b of fixed bearing portion side.Thereby, both can suppress the maximization of the 61b of fixed bearing portion, can prevent that again the above-mentioned of torsion spring 54 from toppling over, can improve the supporting rigidity of the 61b of fixed bearing portion.
And,, therefore,, also can guarantee the actuating range of second connecting rod arm 62 fully although protuberance 56,57 is arranged on the 61b of fixed bearing portion because the actuating range that raised part 56,57 is avoided second connecting rod arm 62 is configured.
In addition, variable valve lift mechanism 33 has crank part 68, this crank part 68 is to form by the outstanding fulcrum 68c that movable fulcrum 68a is set and has an axis parallel with this movable fulcrum 68a on the two ends of connecting plate 68b, and fulcrum 68c is rotatably supported on the valve mechanism cover 16 of engine main body 10, therefore, by making the rotational of crank part 68 around fulcrum 68c, just can easily make movable fulcrum 68a displacement, thereby can make the mechanism simplifying that makes movable fulcrum 68a displacement by actuator motor 72.
Figure 12～Figure 19 represents the second embodiment of the present invention, for giving identical label with the corresponding part of above-mentioned first embodiment.
At first, in Figure 12～Figure 14, on cylinder head 14, be fastened with upper support 98 as abutment wall in the mode that is disposed at each cylinder both sides, on each upper support 98 from above be fastened with end cap 99,100, end cap 99,100 is common to constitute air inlet side cam supporting member 101 and exhaust side cams supporting members 102.And, rotatably mounted between the upper support 98 that constitutes air inlet side cam supporting member 101 and end cap 99 have an admission cam shaft 31, and rotatably mounted between the upper support 98 of common formation exhaust side cams supporting member 102 and end cap 100 have an exhaust cam shaft 103.
Exhaust side pitman arm shaft 104 is supported by upper support 98, one end of exhaust side rocking arm 105 is supported swingably by this exhaust side pitman arm shaft 104, be combined with a pair of adjusting screw 42 respectively on ground, the other end of exhaust side rocking arm 105 can regulate advance and retreat position, the upper end butt of the push rod 20a of these adjusting screw 42 and exhaust valve 20.In addition, on the intermediate portion of exhaust side rocking arm 105, be provided with axle 108, this axle 108 is parallel with exhaust side pitman arm shaft 104, exhaust side valve driving cam 107 is arranged at exhaust cam shaft 103, roller 106 rolls with this exhaust side valve driving cam 107 and contacts, be fitted with roller bearing 109 between roller 106 and described axle 108,106 on this roller is bearing on the exhaust side rocking arm 105.
And the swinging mounting portion of exhaust side rocking arm 105 is an exhaust side pitman arm shaft 104, and the portion of being connected that is disposed at exhaust valve 20 and exhaust side rocking arm 105 is the outside of adjusting screw 42.
Each intake valve 19 is driven by lift changeable mechanism 110 by admission cam shaft 31, this lift changeable mechanism 110 comprises: air inlet side rocking arm 111, it has the roller 114 as the cam abutting part, this roller 114 and air inlet side valve driving cam 69 butts that are arranged at admission cam shaft 31; First connecting rod arm 112, one end are connected with described air inlet side rocking arm 111 rotationally, and its other end rotatably support is in the fixed position of engine main body 10; And second connecting rod arm 113, the one end is connected with air inlet side rocking arm 111 rotationally, and the other end is supported rotationally by displaceable movable fulcrum 134.
In the lump with reference to Figure 15～Figure 17, on an end of air inlet side rocking arm 111, be provided with valve joint 111a, be combined on this valve joint 111a to adjusting screw 70,70 can regulate advance and retreat position, described adjusting screw 70,70 is from the upper end butt of the push rod 19a of top and a pair of intake valve 19.In addition, adjacently be provided with the first support 111b on the other end of air inlet side rocking arm 111 and be disposed at the second support 111c below the first support 111b, the first and second support 111b, 111c form the roughly U word shape that the opposition side to intake valve 19 opens wide.
On the first support 111b of air inlet side rocking arm 111, be supported with roller 114 by first coupling shaft 115 and 116 on roller bearing, this roller 114 rolls with the air inlet side valve driving cam 69 of admission cam shaft 31 and contacts, and roller 114 is configured to by the roughly first support 111b clamping of U word shape.
In the lump with reference to Figure 18, air inlet side rocking arm 111 is by the die formings such as casting of light alloy, this air inlet side rocking arm 111 is on the direction of the rotation axis of air inlet side valve driving cam 69, make the width of the width of described valve joint 111a greater than other parts, the width of the first and second support 111b, 111c is identical.
Be formed with for example weight saving portion 117 of general triangular in the upper face center portion of the valve joint 111a of air inlet side rocking arm 111, in the lower surface both sides of the face of the opposition side of the described upper surface of conduct of valve joint 111a, be formed with a pair of weight saving portion 118,118 with described weight saving portion 117 alternate configurations.
In addition, described weight saving portion 117,118,118, when air inlet side rocking arm 111 die formings, be shaped simultaneously, the pattern draft of the weight saving portion 117 of top is such direction: along with the upper surface towards valve joint 111a, the opening area of weight saving portion 117 increases, relative therewith, the weight saving portion 118 of below, 118 pattern draft is such direction: along with the lower surface towards valve joint 111a, weight saving portion 118,118 opening area increases, therefore, the true dip direction of the inner side surface of weight saving portion 117, with weight saving portion 118, the true dip direction of 118 inner side surface is identical, in weight saving portion 117 adjacent one another are, 118,117, between 118, be formed at the 111d of wall portion of valve joint 111a, the thickness of 111d is roughly even.
In the lump with reference to Figure 19, first connecting rod arm 112 integral body form roughly U word shape, have a pair of joint 112a, a 112a in that one is distolateral, described joint 112a, 112a are from the first support 111b of sandwich air inlet side rocking arm 111, first connecting rod arm 112 is connected with the first support 111b rotationally by first coupling shaft 115, and described first coupling shaft 115 is bearing in 114 on roller on the air inlet side rocking arm 111.In addition, the other end of a fixed pivot axis 119 rotatably support first connecting rod arms 112, this a fixed pivot axis 119 is supported by the upper support 98 that is anchored on cylinder head 14.
Second connecting rod arm 113 is disposed at the below of first connecting rod arm 112, one end of this second connecting rod arm 113 is configured to: by the second support 111c clamping of the roughly U word shape of air inlet side rocking arm 111, and be connected with the second support 111c rotationally by second coupling shaft 120.
Both sides, the other end at first connecting rod arm 112, on upper support 98,98, the outstanding integratedly supporting convex 121,121 that is provided with, described supporting convex 121,121 supporting a fixed pivot axis 119, the other end that can limit first connecting rod arm 112 by these supporting convex 121 is moving on the axial direction of described a fixed pivot axis 119.
In addition, two intake valves 19 pass through valve spring 24 quilts to the valve-closing direction application of force, opening the direction driving by when the valve-closing direction applies two intake valves 19 of elastic force by air inlet side rocking arm 111 to valve, the roller 114 of air inlet side rocking arm 111 contacts with air inlet side valve driving cam 69 by the effect of valve spring 24, but under intake valve 19 closing state, the elastic force of valve spring 24 does not act on the air inlet side rocking arm 111, roller 114 leaves air inlet side valve driving cam 69, thus the possibility that the control accuracy of valve lift amount reduces when existing intake valve 19 to open slightly.Therefore, except that valve spring 24, other is provided with torsion spring 122, this torsion spring 122 is to be inserted into two surfaces, the other end of first connecting rod arm 112 and the plug-in mounting thing between the described supporting convex 121,121, described supporting convex 121,121 is disposed at the both sides, the other end of first connecting rod arm 112, by this torsion spring 122, air inlet side rocking arm 111 quilts are to the direction application of force that makes described roller 114 with air inlet side valve driving cam 69 butts.
Described torsion spring 122 centers on described supporting convex 121, and is arranged between engine main body 10 and the air inlet side rocking arm 111.That is, an end of torsion spring 122 engages with described supporting convex 121, and the other end of torsion spring 122 inserts and is fastened in first coupling shaft 115 of the hollow of moving integratedly with air inlet side rocking arm 111.
The other end of first connecting rod arm 112 forms cylindric, when side-looking, the periphery of the other end of first connecting rod arm 112 is configured in the inboard of the periphery of described torsion spring 122, this torsion spring 122 is wound into helical, on the axial two ends of the other end of first connecting rod arm 112, give prominence to along the circumferentially spaced compartment of terrain respectively and be provided with a plurality of for example a pair of protuberances 123,124, described protuberance 123,124 is used to stop torsion spring 122 to swing to first connecting rod arm 112 sides.Therefore, can avoid the maximization of the other end of first connecting rod arm 112, and prevent that the described of torsion spring 122 from toppling over, thereby improve the supporting rigidity of the other end of first connecting rod arm 112.
And the actuating range that described protuberance 123,124 is avoided second connecting rod arm 113 is provided with, although thereby protuberance 123,124 be arranged at the other end of first connecting rod arm 112, also can fully guarantee the actuating range of second connecting rod arm 113.
Air inlet side cam supporting member 101 is arranged at engine main body 10, on the end cap 99 of this air inlet side cam supporting member 101 oil ejector 125 is installed, and this oil ejector 125 is towards the other end upper lateral part fuel feeding of air inlet side rocking arm 111.
In addition, on one in a plurality of upper support 98, be provided with the passage 126 of guiding from the oil of not shown oil pump.In addition, with the Lower Half of admission cam shaft 31 opposed to each other, be provided with circular-arc recess 127 on the top of each upper support 98, one in described passage 126 and each recess 127 is communicated with.On the other hand, on admission cam shaft 31, be provided with oily passage 128 coaxially, in part corresponding to each air inlet side cam supporting member 101, on admission cam shaft 31, be provided with intercommunicating pore 129, these intercommunicating pore 129 the inners are communicated with oily passage 128, and lubrication oil between each air inlet side cam supporting member 101 and admission cam shaft 31, supplied with by described intercommunicating pore 129 towards the outer surface opening of admission cam shaft 31 in the outer end.
Like this, oil ejector 125 is installed on the end cap 99 of intake cam supporting member 46 that mode with rotatably mounted admission cam shaft 31 is arranged at engine main body 10, therefore, can utilize to be used for the oil duct that is lubricated between admission cam shaft 31 and the air inlet side cam supporting member 101, supply with the oil of sufficiently high pressures and q.s from oil ejector 125.
In addition, first and second coupling shafts 115,120 are connected to an end of first and second link arms 112,113 on the air inlet side rocking arm 111, oil is supplied with from first coupling shaft, 115 sides that are positioned at the top of oil ejector 125 towards first and second coupling shafts 115,120, therefore, to the oil after being lubricated between first connecting rod arm 112 and the air inlet side rocking arm 111, flow to second connecting rod arm 113 sides of below.
And, make the oily introduction hole 132,133 of the part of the movable fulcrum 134 and second coupling shaft 120 towards intermediate portion, be arranged on the second connecting rod arm 113, and be arranged on the direction with the straight line quadrature of the axis that is connected the movable fulcrum 134 and second coupling shaft 120, an end of each oily introduction hole 132,133 is towards first coupling shaft, 115 side openings.Therefore, flow to the oil of below from first connecting rod arm 112, import to effectively between second connecting rod arm 113 and the movable fulcrum 134 and second coupling shaft 120, thereby can be by simple and the few lubricating structure of number of spare parts, joint to the air inlet side rocking arm 111 and first and second link arms 112,113, and be lubricated between second connecting rod arm 113 and the movable fulcrum 134, can guarantee valve actuation smoothly.
The other end of movable fulcrum 134 rotatably support second connecting rod arms 113, this movable fulcrum 134 is arranged at Control Shaft 135, this Control Shaft 135 is to be supported on the single Control Shaft 135 of engine main body 10 by the shared mode of a plurality of cylinders that forms a line, this Control Shaft 135 constitutes crank-like, and has respectively corresponding to each cylinder: the crankweb 135a, the 135a that are disposed at air inlet side rocking arm 111 both sides; Collar 135b, 135b, they and vertical linking to each other of base end part outer surface of two crankweb 135a, 135a, and rotatably support is in engine main body 10; And, connecting the joint 135c between two crankweb 135a, the 135a, movable fulcrum 134 is connected with Control Shaft 135 in the mode that connects between two crankweb 135a, the 135a.
Each collar 135b rotatably support of Control Shaft 135 is between upper support 98 and lower part support 136, and this upper support 98 engages with the cylinder head 14 of engine main body 10, and this lower part support 136 engages with upper support 98 from the below.Lower part support 136 forms with cylinder head 14 splits, and is anchored on upper support 98, is provided with the recess 137 that is used to dispose lower part support 136 on the upper surface of cylinder head 14.
And, between upper and lower supporting member 98,136 and collar 135b, be fitted with roller bearing 139, this roller bearing 139 can dimidiation, so that be inserted between the collar 135b and upper and lower supporting member 98,136 of Control Shaft 135, described Control Shaft 135 is shared by a plurality of cylinders, and has a plurality of crankweb 135a, 135a and joint 135c.
In addition, be formed with Control Shaft supporting convex portion 140 on upper and lower supporting member 98,136, this Control Shaft is side-prominent towards the crankweb 135a of Control Shaft 135 with supporting convex portion 140, and is used to make described collar 135b to run through wherein.On the other hand, upper support 98 and end cap 99 are engaged with each other so that constitute air inlet side cam supporting member 101 jointly, on this upper support 98 and end cap 99, be formed with camshaft supporting convex portion 141 highlightedly towards air inlet side rocking arm 111, this camshaft is used to make admission cam shaft 31 to run through wherein with supporting convex portion 141, the outstanding rib 142 that is provided with of one on upper support 98, this rib 142 connects Control Shaft and uses between the supporting convex portion 141 with supporting convex portion 140 and camshaft.
Be provided with the passage 143 with oily guide roller bearing 139 sides in described rib 142, this passage 143 is communicated in the recess 127 of the upper surface of upper support 98.
In addition, the swinging mounting portion of exhaust side rocking arm 105 is arranged at cylinder head 14, and be disposed at the outside of exhaust side rocking arm 105 and the portion that is connected of exhaust valve 20, relative therewith, a fixed pivot axis 119 and movable fulcrum 134 are equipped on cylinder head 14, and are disposed at the inboard of the portion that is connected of air inlet side rocking arm 111 and intake valve 19.
And, spark plug 144 15 is installed on cylinder head 14 towards the firing chamber, between air inlet side and exhaust side, on cylinder head 14, the spark plug tube 145 that is used to insert spark plug 144 is installed, and these spark plug tube 145 tilted configuration become along with moving closer to exhaust valve 20 sides towards the top.
When intake valve 19 is in open mode, second connecting rod arm 113 is connected to second coupling shaft 120 on the air inlet side rocking arm 111, be in coaxial position with the collar 135b of Control Shaft 135, when Control Shaft 135 during, move on the circular arc that movable fulcrum 60 is the center at the axis with collar 135b around the swing of the axis of collar 135b.
Among the collar 135b that Control Shaft 135 is had one, outstanding from the bearing hole 16a that is arranged at valve mechanism cover 16, the same with first embodiment, be fixed in the control arm 71 of this collar 135b end, drive by the actuator motor 72 of the outer wall that is installed on cylinder head 14.
According to this second embodiment, be used for making the valve of intake valve 19 open lift amount continually varying lift changeable mechanism 110, first and second link arms 112, an end of 113 side by side and can be connected with air inlet side rocking arm 111 with relatively rotating, this air inlet side rocking arm 111 has the valve joint 111a that is connected in linkage with a pair of intake valve 19, the other end of first connecting rod arm 112 is by a fixed pivot axis 119 rotatably supports, this a fixed pivot axis 119 is supported on engine main body 10, and the other end of second connecting rod arm 113 is by displaceable movable fulcrum 134 rotatably supports.
Therefore, can the lift amount of intake valve 19 be changed continuously, not need closure just can control air inflow by movable fulcrum 134 infinitely is shifted.And an end of first and second link arms 112,113 directly is connected with air inlet side rocking arm 111 rotationally, thereby the space that can reduce to dispose two link arms 112,113, can realize the miniaturization of valve device, and owing to directly be passed to the roller 114 of air inlet side rocking arm 111, so can guarantee good followability with respect to air inlet side valve driving cam 69 from the power of air inlet side valve driving cam 69.In addition, can be with air inlet side rocking arm 111 and first and second link arms 112,113 in the position configuration on the direction of the axis of admission cam shaft 31 in roughly the same position, thereby can make air inlet side valve device on the direction of the axis of admission cam shaft 31, realize miniaturization.
An end of first connecting rod arm 112 is connected with air inlet side rocking arm 111 rotationally by first coupling shaft 115 in addition, roller 114 is supported on air inlet side rocking arm 111 by 115 of first coupling shafts, therefore, realize an end of first connecting rod arm 112 and rotating connection of air inlet side rocking arm 111 by the first common coupling shaft 115, and the axle supporting of described roller 114 on air inlet side rocking arm 111, thereby can reduce number of components and make the further miniaturization of air inlet side valve device.
In the air inlet side valve device in air inlet side and exhaust side valve device with lift changeable mechanism 110, a fixed pivot axis 119 and movable fulcrum 134 are configured in the inboard of the portion that is connected of air inlet side rocking arm 111 and intake valve 19, the swinging mounting portion of the exhaust side rocking arm 105 that the exhaust side valve device is had, be disposed at the outside of the portion that is connected of exhaust side rocking arm 105 and exhaust valve 20, therefore, even in order to make firing chamber 15 miniaturizations, to obtain good burning, and set the angle α (with reference to Figure 12) of intake valve 19 and exhaust valve 20 less, also can avoid the maximization of cylinder head 14, and can prevent the mutual interference of air inlet side and exhaust side valve device.
In addition, the exhaust side valve device comprises: the exhaust cam shaft 103 with exhaust side valve driving cam 107; And exhaust side rocking arm 105, it is supported on engine main body 10 swingably by exhaust side pitman arm shaft 104, so that follow 107 swings of exhaust side valve driving cam, and this exhaust side rocking arm 105 is connected in linkage with exhaust valve 20, spark plug tube 145 is disposed between air inlet side and the exhaust side valve device, and be installed on cylinder head 14: along with moving closer to the exhaust side valve device towards the top in such inclination mode, therefore can under the situation of avoiding spark plug tube 145 and air inlet side and exhaust side valve device to interfere, dispose spark plug tube 145, and can help to make cylinder head 14 whole further miniaturizations.
In addition, lift changeable mechanism 110 has Control Shaft 135, this Control Shaft 135 is can make movable fulcrum 134 around being connected with movable fulcrum 134 with the mode of the axis generation angular displacement of its parallel axes, and this Control Shaft 135 at the two-side supporting of air inlet side rocking arm 111 in engine main body 10, the supporting rigidity of Control Shaft 135 can be improved by dual-supporting, and the variable control of lift amount of intake valve 19 can be critically carried out.
And because single described Control Shaft 135 to be supported on engine main body 10 by the shared mode of a plurality of cylinders that forms a line, therefore can avoid components number to increase, thereby can make the motor miniaturization.
The collar 135b of described Control Shaft 135, be rotatably supported between upper support 98 and the lower part support 136, this upper support 98 engages with the cylinder head 14 of engine main body 10, this lower part support 136 engages with upper support 98 from the below, thereby can improve the assembling performance of Control Shaft 135 on engine main body 10, and since with cylinder head 14 for the lower part support 136 of Different Individual is fastened on the upper support 98, therefore can improve the design freedom of the cylinder head 14 when supporting Control Shaft 135.
In addition, between upper and lower supporting member 98,136 and collar 135b, be fitted with can be in two roller bearing 139, therefore can be reduced in the frictional loss on the support of Control Shaft 135, and can improve the assembling performance of Control Shaft 135.
In addition, on the upper and lower supporting member 98,136 that is bonded with each other, be formed with side-prominent Control Shaft supporting convex portion 140 towards the crankweb 135a of Control Shaft 135, therefore the collar 135b rotatably support that runs through Control Shaft usefulness supporting convex portion 140 can further improve the supporting rigidity of Control Shaft 135 between upper and lower supporting member 98,136.
In addition, upper support 98 with from above be engaged on the end cap 99 of upper support 98, be formed with the camshaft supporting convex portion 141 of giving prominence to towards air inlet side rocking arm 111, admission cam shaft 111 runs through camshaft supporting convex portion 141, can be rotated to support between upper support 98 and the end cap 99, therefore the number of components that is used to support admission cam shaft 111 inferior limit can be suppressed at, the supporting rigidity of admission cam shaft 111 can be improved.
In addition, the connection Control Shaft is given prominence to the rib between the supporting convex portion 141 142 with supporting convex portion 140 and camshaft and is arranged at upper support 98, therefore can further improve the supporting rigidity of Control Shaft 135 and admission cam shaft 31.
In air inlet side rocking arm 111, on the upper and lower surface of the opposition side each other of its valve joint 111a, be formed with staggered weight saving portion 117,118,118, therefore can realize the lightweight of air inlet side rocking arm 111.
And, when air inlet side rocking arm 111 mould-formings, also form each weight saving portion 117,118,118, and weight saving portion 117,118 adjacent one another are, 117,118 pattern draft is reverse each other, so weight saving portion 117,118 adjacent one another are, 117,118 inner side surface tilts to same direction, so in weight saving portion adjacent one another are 117,118,117, it is roughly even to be formed at the thickness of the 111d of wall portion, 111d of air inlet side rocking arm 111 between 118, and roughly the 111d of wall portion, 111d can keep the rigidity of air inlet side rocking arm 111 uniformly by thickness.
In addition, the lift amount of intake valve 19 can infinitely change by lift changeable mechanism 110, even therefore have number of spare parts more, become under the situation of valve device of the lift changeable mechanism 110 that makes valve device weight cause of increased easily, by making 111 lightweights of air inlet side rocking arm, also the valve device lightweight can be made, limit speed can be increased.
More than the embodiment of the invention is illustrated, but the invention is not restricted to the foregoing description, do not breaking away from the scope of protection of present invention and can carry out various design alterations the present invention.
Claims (10)
1. the valve device of a motor, it comprises:
Rocking arm (63,111), it has the cam abutting part (65,114) with valve driving cam (69) butt, and this rocking arm (63,111) is connected in linkage with engine valve (19);
First connecting rod arm (61,112), the one end is connected rotationally with this rocking arm (63,111), and its other end rotatably support is on the fixed position of engine main body (10);
Second connecting rod arm (62,113), the one end is connected rotationally with described rocking arm (63,111), and its other end is by displaceable movable fulcrum (68a, 134) rotatably support; And
Driver element (72), it is connected with movable fulcrum (68a, 134), can make the position change of described movable fulcrum (68a, 134), so that the lift amount of engine valve (19) is changed continuously,
Described rocking arm (63,111) comprises valve joint (63a, 111a) and first and second supports (63b, 63c; 111b, 111c), be combined with the adjusting screw (70) of distinguishing butt with a pair of engine valve (19), described first and second supports (63b, 63c in the last can regulate advance and retreat of described valve joint (63a, 111a) position; 111b, 111c) rotationally with first and second link arms (61,62; 112,113) an end connects, and described rocking arm (63,111) constitutes: described valve joint (63a, 111a) is at the width of the width on the direction of the spin axis of described valve driving cam (69) greater than other parts.
2. the valve device of motor according to claim 1 is characterized in that,
Fulcrum (67,119) rotatably support is passed through in abutment wall (44a, 98) in the other end of described first connecting rod arm (61,112), this abutment wall (44a, 98) is arranged at described engine main body (10) in the mode of the both sides of the other end of being disposed at this first connecting rod arm (61,112), between the other end and described two abutment wall (44a, 98) of first connecting rod arm (61,112), be fitted with plug-in mounting thing (54,122) respectively.
3. the valve device of motor according to claim 2 is characterized in that,
Described plug-in mounting thing (54,122) is the torsion spring that is arranged in such a way between engine main body (10) and described rocking arm (63,111): to described rocking arm (63,111) to a side application of force that makes described cam abutting part (65,114) and described valve driving cam (69) butt.
4. the valve device of motor according to claim 1 is characterized in that,
Described first support (63b, 111b) forms roughly U word shape, and from the roller (65,114) of sandwich as described cam abutting part, described roller (65,114) is rotatably mounted by first support (63b, 111b).
5. the valve device of motor according to claim 4 is characterized in that,
On an end of first connecting rod arm (61,112), be provided with a pair of joint (61a, 112a), this a pair of joint (61a, 112a) is from first support (63b, 111b) of the described rocking arm of sandwich (63,111), two joints (61a, 112a) are connected with first support (63b, 111b) rotationally by coupling shaft (64,115), and described roller (65,114) is supported on described first support (63b, 111b) by described coupling shaft (64,115) axle.
6. the valve device of motor according to claim 1 is characterized in that,
Described rocking arm (63,111) forms and makes first and second supports (63b, 63c; 111b, 111c) width identical.
7. the valve device of motor according to claim 1 is characterized in that,
First support (63b) is provided with first attachment hole (49), and second support (63c) is provided with second attachment hole (50), the relative position of described first attachment hole and second attachment hole is arranged along the on-off action direction of described two engine valves (19), described attachment hole (49,50) be penetrated with coupling shaft (64 in, 66), described coupling shaft (64,66) be respectively applied for rotationally and first and second link arms (61,62) a end connects, with respect at described two engine valves (19) side and two attachment holes (49,50) tangent line (L) that outer rim is tangent, in a side opposite with described two engine valves (19), dispose at least a portion of connecting wall (63d), the first and second support (63b, couple together by this connecting wall (63d) 63c).
8. the valve device of motor according to claim 7 is characterized in that,
Be formed with recess (51) on such position of described connecting wall (63d): in the other end of second connecting rod arm (62) under the state near rocking arm (63) side, with the opposed position, the other end of described second connecting rod arm (62).
9. the valve device of motor according to claim 7 is characterized in that,
On described connecting wall (63d), be formed with weight saving portion (52).
10. the valve device of motor according to claim 1 is characterized in that,
On the upper and lower surface of the opposition side each other of formed in mould rocking arm, be formed with weight saving portion interlaced with each other (117,118).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP009396/2004 | 2004-01-16 | ||
| JP2004009396 | 2004-01-16 | ||
| JP023953/2004 | 2004-01-30 | ||
| JP350023/2004 | 2004-12-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1910349A CN1910349A (en) | 2007-02-07 |
| CN100396891C true CN100396891C (en) | 2008-06-25 |
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ID=37700816
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800025474A Expired - Fee Related CN100396891C (en) | 2004-01-16 | 2005-01-13 | Valve operating device for engine |
Country Status (1)
| Country | Link |
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| CN (1) | CN100396891C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775159B (en) * | 2014-01-23 | 2017-02-01 | 长城汽车股份有限公司 | Air distribution mechanism for engine and vehicle with same |
| CN103758603B (en) * | 2014-01-23 | 2017-02-01 | 长城汽车股份有限公司 | Valve mechanism for engine and vehicle with same |
| JP2016035252A (en) * | 2014-08-04 | 2016-03-17 | トヨタ自動車株式会社 | Internal combustion engine valve gear device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62185809U (en) * | 1986-05-16 | 1987-11-26 | ||
| US5111781A (en) * | 1990-03-14 | 1992-05-12 | Suzuki Kabushiki Kaisha | Valve actuating mechanism in four-stroke cycle engine |
| JPH05202720A (en) * | 1992-01-30 | 1993-08-10 | Honda Motor Co Ltd | Valve driving device for internal combustion engine |
| CN1203309A (en) * | 1997-06-24 | 1998-12-30 | 本田技研工业株式会社 | Valve operating system in internal combustion engine |
| WO2003008772A1 (en) * | 2001-07-17 | 2003-01-30 | Thyssenkrupp Automotive Ag | Variable valve-stroke controller |
-
2005
- 2005-01-13 CN CNB2005800025474A patent/CN100396891C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62185809U (en) * | 1986-05-16 | 1987-11-26 | ||
| US5111781A (en) * | 1990-03-14 | 1992-05-12 | Suzuki Kabushiki Kaisha | Valve actuating mechanism in four-stroke cycle engine |
| JPH05202720A (en) * | 1992-01-30 | 1993-08-10 | Honda Motor Co Ltd | Valve driving device for internal combustion engine |
| CN1203309A (en) * | 1997-06-24 | 1998-12-30 | 本田技研工业株式会社 | Valve operating system in internal combustion engine |
| WO2003008772A1 (en) * | 2001-07-17 | 2003-01-30 | Thyssenkrupp Automotive Ag | Variable valve-stroke controller |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1910349A (en) | 2007-02-07 |
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