CN100487231C - Valve actuating device of engine - Google Patents

Abstract

An engine valve operating system is provided in which a rocker arm (63) linked and connected to an engine valve (19) and has a cam-abutting portion (65) to abut a valve operating cam (69) is turnably connected, via first and second connecting shafts (64, 66), to one end of a first link arm (61) turnably supported on an engine body (10) and one end of a second link arm (62) turnably supported by a displaceable movable shaft (68a). Also, oil supply means (58) which supply oil to the upper connecting shaft (64) of first and second connecting shafts (64, 66) are fixed to the engine body (10). This makes it possible to implement an engine valve operating system which is compact in size, ensures follow-up ability of the valve opening/closing operation, has a simple lubricating structure with a reduced number of parts, and ensures smooth valve operation while allowing the lift amount of the engine valve to be varied continuously.

Description

The valve device of motor

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 internal-combustion engine 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 body of the internal-combustion engine, and the other end of second connecting rod arm is moved by driver element, can realize the compactness 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-No. 74534

Patent documentation 2: Japanese patent gazette spy opens 2004-No. 36560

Summary of the invention

, in the above-mentioned valve device that proposes a plan, in order to ensure valve actuation smoothly, the joint of first and second link arms and rocking arm must be lubricated respectively, and under the situation of two joints difference fuel feeding, not only complex structure, and components number also will increase.

The present invention In view of the foregoing proposes, purpose is to provide a kind of valve device of motor, make on the lift amount continually varying basis of engine valve, guarantee the followability of valve on-off action, and realize miniaturization simultaneously, and, guarantee valve actuation smoothly by lubricating structure simple and that components number is few.

For reaching above-mentioned purpose, of the present invention first is characterised in that, comprising: rocking arm, its have the valve joint that is connected in linkage with engine valve and with the cam abutting part of valve driving cam butt; The first connecting rod arm, the one end is connected with this rocking arm rotationally by first coupling shaft, and its other end rotatably support is in the fixed position of engine main body; The second connecting rod arm, the one end is connected with described rocking arm rotationally by second coupling shaft, and its other end is rotatably supported on the displaceable movable axis, wherein above-mentioned second coupling shaft be disposed at first coupling shaft position arranged side by side up and down on; Driver element, it is connected with movable axis, can make the displacement of described movable axis, so that the lift amount of engine valve changes continuously; The oil feed unit, its fixed configurations is on engine main body, and the coupling shaft side fuel feeding of the top in first and second coupling shafts.

In addition, the present invention is on the basis of the structure of above-mentioned first feature, second is characterised in that, described rocking arm is provided with support, and this support roughly forms U word shape, and it clips the roller as described cam abutting part from both sides, one end of first connecting rod arm is by first coupling shaft of the described roller of axle supporting, be connected rotationally with described support, described oily feed unit is provided on the engine main body, and towards the faying surface fuel feeding of first connecting rod arm and described support.

The present invention is on the basis of the structure of above-mentioned first feature, the 3rd is characterised in that, on engine main body, be provided with the cam supporting member, on this cam supporting member, be equipped with described oily feed unit in the rotatably mounted mode that is provided with the camshaft of described valve driving cam.

The present invention is on the basis of arbitrary structure of above-mentioned first～the 3rd feature, and the 4th is characterised in that, described oily feed unit is the oil ejector that has spray-hole at the end of pipeline, and described oily feed unit is provided on the described engine main body in the both sides of cylinder.

And then, the present invention is on the basis of arbitrary structure of above-mentioned first～the 3rd feature, the 5th is characterised in that, described oily feed unit is the oil ejector that has spray-hole at the end of pipeline, and described oily feed unit is provided on the described engine main body in a side of cylinder.

In accordance with a first feature of the invention, by making the stepless displacement of movable axis, can make the stepless variation of lift amount of engine valve, in addition, an end of first and second link arms directly is connected rotationally with rocking arm, can reduce to dispose the space of two link arms, can realize the miniaturization of valve device, owing to the cam abutting part that directly is passed to rocking arm from the power of valve driving cam, therefore, can guarantee good followability with respect to the valve driving cam.And, one end of first and second link arms is by being configured in locational first and second coupling shafts arranged side by side up and down, be connected rotationally with rocking arm, and the coupling shaft side fuel feeding of the top in first and second coupling shafts, therefore, oil after being lubricated between the link arm of the top in first and second link arms and the rocking arm is flowed to the below, thereby to being lubricated between the link arm of below and the rocking arm, can be by simple and the few lubricating structure of components number, the joint of rocking arm with first and second link arms is lubricated, can guarantees valve actuation smoothly.

In addition,,, the formation miniaturization of the whole rocking arm that comprises roller can be made, and the axle support of roller can be lubricated by the rotatably mounted roller of the support of rocking arm according to the structure of second feature of the present invention.

According to the 3rd feature of the present invention, can utilize to be used for the oil circuit that is lubricated between camshaft and the cam supporting member, supply with the abundant high pressure and the abundant oil of amount from oily feed unit.

According to the 4th feature of the present invention, can be from the end of the oil ejector that is configured in the cylinder both sides, to oily donor site fuel feeding.

According to the 5th feature of the present invention, both can reduce the number of oil ejector, again can be to oily donor site fuel feeding.

Description of drawings

Fig. 1 is the partial longitudinal section figure of first embodiment's motor, is the sectional view of the 1-1 line among Fig. 2.(embodiment 1)

Fig. 2 is the sectional view along the 2-2 line among Fig. 1.(embodiment 1)

Fig. 3 is the view along the 3-3 direction of arrow among Fig. 2.(embodiment 1)

Fig. 4 is the side view of variable valve lift mechanism.(embodiment 1)

Fig. 5 is the exploded perspective view of variable valve lift 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 of arrow 7 directions among Fig. 3.(embodiment 1)

Fig. 8 A is the Action Specification figure of the variable valve lift mechanism under the state of big valve lift amount.(embodiment 1)

Fig. 8 B is the Action Specification figure of the variable valve lift mechanism under the state of little valve lift amount.(embodiment 1)

Fig. 9 is the figure of the valve lift 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 the angle of rotation of expression angle of rotation of control arm and sensor arm.(embodiment 1)

Figure 12 is second embodiment's the sectional view corresponding to Fig. 2.(embodiment 2)

Label declaration

10: engine main body; 19: as the intake valve of engine valve; 31: camshaft; 46: the cam supporting member; 58: as the oil ejector of oily feed unit; 58a: pipeline; 58b: spray-hole; 61: the first connecting rod arm; 62: the second connecting rod arm; 63: rocking arm; 63a: valve joint; 63b: support; 64: the first coupling shafts; 65: as the roller of cam abutting part; 66: the second coupling shafts; 68a: movable axis; 69: the valve driving cam; 72: as the actuator motor of driver element; E: motor.

Embodiment

Below, the embodiments of the invention shown in describe embodiments of the present invention with reference to the accompanying drawings.

Embodiment 1

Fig. 1～Figure 11 represents the first embodiment of the present invention.

At first, in Fig. 1, the engine main body 10 as multiple cylinder engine E in upright arrangement has: 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, at each cylinder thorax 11 ... in, slidably chimeric have a piston 13 ..., with each piston 13 ... the right firing chamber 15 of top surface ..., be formed between cylinder block 12 and the cylinder head 14.

On cylinder head 14, be provided with can with each firing chamber 15 ... the suction port 17 that is communicated with ... with relief opening 18 ... each suction port 17 ... by a pair of intake valve 19 as engine valve ... open and close respectively, each relief opening 18 (...) by a pair of exhaust valve 20 ... open and close respectively.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 ... be subjected to the active force to the direction of closing valve, wherein said spring seat 22 is arranged at the upper end of push rod 19a.In addition, the push rod 20a of 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 ... be subjected to active force to the direction of closing 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 ... at each abutment wall 44a ... last joint has end cap 45 ..., 47 ..., end cap 45 ..., 47 ... collaborative formation intake cam supporting member 46 ... with exhaust cam supporting member 48 ...So, at intake cam supporting member 46 ... on, rotatably mounted have an admission cam shaft 31, at exhaust cam supporting member 48 ... on, rotatably mounted have an exhaust cam shaft 32, intake valve 19 ... drive exhaust valve 20 by admission cam shaft 31 by variable valve lift mechanism 33 ... drive by lift-timing changeable mechanism 34 by exhaust cam shaft 32.

Drive exhaust valve 20 ... lift-timing changeable mechanism 34 known for everyone, its summary is described herein.Exhaust rocker arm axle 35 is by exhaust cam holder 48 ... in abutment wall 44a ... supporting, 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 exhaust valve 20 ... push rod (stem) 20a ... the adjusting screw 42 of upper end butt ..., screw to can regulate advance and retreat position at the other end of low speed with 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, connect with removing and be connected and switch, 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, then low speed uses cam 39,39 to drive exhaust valve 20 with rocking arm 36,36 by the low speed of correspondence ... open and close 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, exhaust valve 20 with rocking arm 37 ... open and close with high lift, high angle of release.Like this, by lift-timing changeable mechanism 34, divide two-stage control exhaust valve 20 ... lift and timing.

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: rocking arm 63, it has the roller 65 as the cam abutting part, this roller 65 and 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 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 rocking arm 63, and its other end is rotatably supported on the displaceable movable axis 68a.

Be provided with valve joint 63a in an end of rocking arm 63, be combined with adjusting screw 70,70 to can regulate advance and retreat position on it, this adjusting screw 70,70 is from top and a pair of intake valve 19 ... in push rod 19a ... the upper end butt.The roughly U word shape that opens wide of ... opposition side in addition; the other end of rocking arm 63 forms to intake valve 19; on the other end of rocking arm 63, be provided with: the first support 63b, it is used for an end of first connecting rod arm 61 is pivotally connected to the other end of rocking arm 63; The second support 63c, it is used for an end of second connecting rod arm 62 is pivotally connected to the other end of rocking arm 63, and the second support 63c is configured in the below of the first support 63b.And, be configured to like this by the roughly first support 63b clamping of U word shape with the 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, rocking arm 63 forms on the direction of the rotation axis of 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 rocking arm 63; The fixed bearing 61b of portion cylindraceous; A pair of arm 61c, 61c, it connects 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 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 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, along above-mentioned two intake valves 19 ... the on-off action direction be 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; rocking arm 63 has above-mentioned roller 65 with valve driving cam 69 butts at the other end upper lateral part; an end of this rocking arm 63 and a pair of intake valve 19 ... connect in linkage; the first joint 61a, 61a that the first connecting rod arm 61 of top is had in the one end; and be disposed at the second joint 62a that the second connecting rod arm 62 of first connecting rod arm 61 belows is had in the one end, be connected with the other end of rocking arm 63 side by side and rotatably up and down.

In addition, on above-mentioned rocking arm 63, be provided with a pair of connecting wall 63d integratedly ..., described a pair of connecting wall 63d ... connect and be roughly between the first and second support 63b, the 63c of U word shape.And connecting wall 63d ... form: with respect at above-mentioned two intake valves 19 ... the tangent line L that the outer rim of the side and first and second attachment holes 49,50 is tangent, connecting wall 63d ... at least a portion be configured in above-mentioned two intake valves 19 ... opposition side, and this connecting wall 63d ... connect between the first and second support 63b, the 63c.

In addition, at connecting wall 63d ... on be formed with recess 51 ..., this recess 51 ... be disposed at such position: the 62b of movable support portion of the other end of second connecting rod arm 62 near the state of rocking arm 63 sides under with the opposed position of movable axis 68a.In addition, at above-mentioned connecting wall 63d ... on, 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 a fixed pivot axis 67, this a fixed pivot axis 67 is fixedly supported upon abutment wall 44a ... on, this abutment wall 44a constitutes the intake cam holder 46 that is arranged at engine main body 10 ... the bottom.

Pay special attention to Fig. 6, at above-mentioned abutment wall 44a ... on, to give prominence to integratedly and be provided with a pair of supporting convex 53,53, described supporting convex 53,53 is from the 61b of fixed bearing portion of axial sandwich first connecting rod arm 61.At these supporting convex 53 ... be 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 minor diameter axial region 53a ... base end part, 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 supporting convex 53 ... on, and with minor diameter axial region 53a ... run through minor diameter axial region 53a coaxially ...

And two intake valves 19 ... by valve spring 24 ... apply elastic force to the direction of closing valve, when driving two intake valves 19 that applied elastic force to the direction of closing valve to the direction of opening valve by rocking arm 63 ... the time; the roller 65 of rocking arm 63 is by valve spring 24 ... effect; with valve driving cam 69 butts; but at intake valve 19 ... closed condition under; valve spring 24 ... elastic force do not act on the rocking arm 63; roller 65 leaves valve driving cam 69 thus; at intake valve 19 ... when opening slightly, the possibility that exists the control accuracy of valve lift amount to reduce.Therefore, by with valve spring 24 ... different rocking arm force application springs 54 ..., to rocking arm 31 to the direction application of force that makes described roller 65 with valve driving cam 69 butts.

Above-mentioned rocking arm force application spring 54 ... it is the spiral helicine torsion spring that centers on the side among a fixed pivot axis 67 and the movable axis 68a, a fixed pivot axis 67 and movable axis 68a rotatably support are as the 61b of fixed bearing portion and the 62b of movable support portion of the other end of first and second link arms 61,62, in the present embodiment, above-mentioned rocking arm force application spring 54 ... be configured to by above-mentioned supporting convex 53 ... on minor diameter axial region 53a ... surround said fixing fulcrum 67, and above-mentioned rocking arm force application spring 54 ... be arranged between engine main body 10 and the rocking arm 63.That is, surround above-mentioned minor diameter axial region 53a ... rocking arm force application spring 54 ... an end, with be embedded in above-mentioned supporting convex 53 ... end difference 53b in fastening pin 55 ... the engaging; rocking arm force application spring 54 ... the other end, insert and be fastened in first coupling shaft 64 of the hollow of moving integratedly with rocking arm 63.

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 and is wound into spiral helicine described rocking arm force application spring 54 when side-looking ... the inboard of periphery, axial two end part at the 61b of fixed bearing portion, outstandingly respectively along the circumferentially spaced compartment of terrain be provided with a plurality of for example a pair of protuberances 56,57, described protuberance 56,57 is used to stop rocking arm force application spring 54 ... fall to the 61b of fixed bearing portion inclination, 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 of an end of first and second link arms 61,62 ... with the second joint 62a, be connected to the other end of rocking arm 63, and first and second coupling shafts 64,66 are configured on the position arranged side by side up and down oil ejector 58 ... the coupling shaft fuel feeding of the top in first and second coupling shafts 64,66.This oil ejector 58 has spray-hole 58b at the end of pipeline 58a, in the present embodiment, oil ejector 58 ... first coupling shaft, 64 fuel feeding of the coupling shaft of the conduct top in first and second coupling shafts 64,66, this oil ejector 58 ... be fixedly mounted in the intake cam holder 46 that is arranged on the engine main body 10 ... in end cap 45 ... on.And, in the present embodiment, oil ejector 58 ... be installed in the end cap 45 of above-mentioned engine main body 10 in the cylinder both sides ... on, and with cylinder-bore axis plane orthogonal (plane that is parallel to the paper of Fig. 2) on projection drawing on, make the end of above-mentioned pipeline 58a be configured in the inboard of the peripheral portion of firing chamber 15.

In addition, another distolateral top at 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 ... be provided in above-mentioned end cap 45 ... on, and towards the first joint 61a of first connecting rod arm 61 ... faying surface fuel feeding with the first support 63b.

Movable axis 68a rotatably support second connecting rod arm 62 is at the 62b of movable support portion that its other end had, and this movable axis 68a is arranged on the crank part 68.This crank part 68 constitutes: at the two ends that are disposed at the connecting plate 68b on the plane parallel with the action plane of second connecting rod arm 62, be provided with outstanding in the opposite direction above-mentioned movable axis 68a and fulcrum 68c, and above-mentioned movable axis 68a and fulcrum 68c and connecting plate 68b meet at right angles, above-mentioned fulcrum 68c can be rotated to support in the bearing hole 16a, and bearing hole 16a is arranged on the valve mechanism cover 16 on the engine main body 10.

Like this, when rocking arm 63 is in lifting position shown in Figure 4, that is intake valve 19 ... when being in closed condition, on the axis C of second coupling shaft 66 of the bottom of pivot suspension 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 axis 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, movable axis 68a in Fig. 8 A the position and the position among Fig. 8 B between move.

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 this sensor axis 80a.On control arm 71, be formed with guide groove 82, 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 along its vertical linearly extension.

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 14a of covering wall portion, 16b end face is by screw 79 ... be fixed on the 14a of wall portion, the 16b.

In above-mentioned 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 axis 68a of crank part 68 rises.Under this state, when by 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 axis 68a produce distortion; 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 ..., thus intake valve 19 opened 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 axis 68a of crank part 68 decline.Under this state, when by valve driving cam 69 press-on roller 65 of admission cam shaft 31, above-mentioned four joint linkage mechanisms produce distortion; 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 intake valve 19 ... push rod 19a ..., thereby open 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, and have only lift amount to change.Like this, by lift changeable mechanism 33 is set, do not changing intake valve 19 ... the situation of angle of release under, can at random change lift amount.

In addition, make crank part 68 swings by actuator motor 72, with change intake valve 19 ... lift the time, 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, as long as lift amount 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, and the resolution of rotation angle sensor 80 improves, thereby 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.

As from 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 the approaching mutually configuration of one distolateral (near a side of rotation angle sensor 80) of one distolateral (near the side of fulcrum 68c) and the 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, when a distolateral formation guide groove 82 of control arm 71, then the distance from axis C diminishes, the amount of movement along the circumferential direction of guide groove 82 also diminishes, and owing to the length of sensor arm 81 also shortens, therefore, can fully guarantee the corner of sensor arm 81, thereby guarantee the testing precision of rotation angle sensor 80.

Next, effect to this first mode of execution describes, lift changeable mechanism 33 is used to make intake valve 19 ... the lift amount of opening valve 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; rocking arm 63 has in the one end and a pair of intake valve 19 ... the valve joint 63a of Lian Jieing in linkage; the first and second joint 61a; 61a; 62a is connected side by side and rotatably with the other end of rocking arm 63; 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, support rotationally by displaceable movable axis 68a.

Thereby, by making the stepless displacement of movable axis 68a, can make intake valve 19 ... the stepless variation of lift amount, and an end of first and second link arms 61,62 directly is connected rotationally with 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 valve driving cam 69 directly is passed on the roller 65 of rocking arm 63, therefore, can guarantee the good followability with respect to valve driving cam 69.In addition, can with 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 rocking arm 63 has: valve joint 73a is combined with on it respectively and a pair of intake valve 19 ... the adjusting screw 70 of butt ..., and can regulate this adjusting screw 70 ... the advance and retreat position; The first and second support 63b, 63c, they connect an end of first and second link arms 61,62 rotationally, this rocking arm 63 forms and makes along the width of the valve joint 63a on the direction of the rotation axis of valve driving cam 69 width greater than other parts, therefore, can reduce rocking arm 63 as much as possible along the width on the direction of the spin axis of valve driving cam 69, thereby, also just can realize the miniaturization of valve device.In addition since rocking arm 63 that the width of the first and second support 63b, 63c is formed is identical, therefore, both can realize the simplification of the shape of rocking arm 63, can make rocking arm 63 miniaturizations again.

In addition, be arranged at the first support 63b on the 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 make the rocking arm 63 whole formation miniaturizations that comprise roller 65.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 ... be connected rotationally with the first support 63b 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 rocking arm 63, on the 63c, along two intake valves 19 ... the on-off action direction be 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 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 ... be arranged to: with respect at two intake valves 19 ... the side and first and second attachment holes 49, the tangent line L that 50 outer rim is tangent, connecting wall 63d ... at least a portion be configured in two intake valves 19 ... opposition side, at this connecting wall 63d ... on, because the 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, at connecting wall 63d ... on be formed with recess 51 ... recess 51 ... at the 62b of movable support portion of the other end of second connecting rod arm 62 under the state near 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 rocking arm 63 sides, thereby, both can make the valve device miniaturization, again can be with intake valve 19 ... maximum lift set greatly as much as possible.

In addition, because at connecting wall 63d ... on be formed with weight saving portion 52 ..., therefore, both can pass through connecting wall 63d ... increase rigidity, the weight that can suppress rocking arm 63 again increases.

First and second coupling shafts 64,66 are connected to an end of first and second link arms 61,62 on the rocking arm 63, oil ejector 58 ... first coupling shaft, the 64 side fuel feeding of the top in first and second coupling shafts 64,66, and this oil ejector 58 ... fixed configurations is 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 rocking arm 63 is flowed to the below, thereby to being lubricated between the second connecting rod arm 62 of below and the rocking arm 63.Thereby, can be by the simple and few lubricating structure of components number, the joint of the rocking arm 63 and first and second link arms 61,62 is lubricated together, 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 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 above-mentioned oil ejector 58 rotationally with the first support 63b ... be 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 with oil ejector 58 ... be installed in the intake cam supporting member 46 that is arranged at engine main body 10 in the mode of rotatably mounted admission cam shaft 31 ... end cap 45 ... on, therefore, can utilize and be used for admission cam shaft 31 and intake cam supporting member 41 ... between the oil circuit that is lubricated, from oil ejector 58 ... the oil of supplying with abundant high pressure and fully measuring, wherein above-mentioned admission cam shaft 31 is provided with valve driving cam 69.

In addition, in the present embodiment, the oil ejector 58 that has spray-hole 58b at the end of pipeline 58a ... be provided in the end cap 45 of above-mentioned engine main body 10 in the both sides of cylinder ... on, and with the cylinder-bore axis plane orthogonal on projection drawing on, make pipeline 58a ... end be configured in the inboard of the peripheral portion of firing chamber 15, therefore, can make oil ejector 58 ... end, from the both sides of cylinder near oily donor site, thereby can be reliably to the donor site fuel feeding.

In addition, intake valve 19 ... by valve spring 24 ... to the direction application of force of closing valve, but rocking arm 63 by with valve spring 24 ... different rocking arm force application springs 54 ... quilt is to the direction application of force that makes roller 65 with valve driving cam 69 butts, therefore, even at intake valve 19 ... under the closing state, the roller 65 of rocking arm 63 can not leave valve driving cam 69 yet, can improve intake valve 19 ... the control accuracy of the valve lift amount when opening slightly.

In addition; rocking arm force application spring 54 ... be the spiral helicine torsion spring of the side in a fixed pivot axis 67 and the movable axis 68a; the other end of said fixing fulcrum 67 and movable axis 68a rotatably support first and second link arms 61,62; in the present embodiment; rocking arm force application spring 54 ... around a fixed pivot axis 67; thus can reduce rocking arm force application spring 54 ... the space is set, can realize the miniaturization of valve device.

And, the a pair of supporting convex 53 of supporting a fixed pivot axis 67,53, be arranged on the intake cam supporting member 46 of engine main body 10 in mode from the other end of sandwich first connecting rod arm 61 ... abutment wall 44a ... on, and rocking arm force application spring 54 ... to center on two supporting convex 53,53 mode is arranged between engine main body 10 and the rocking arm 63, therefore, by a pair of supporting convex 53,53 limit moving of the 61b of fixed bearing portion in the other end of first connecting rod arm 61, and can make rocking arm force application spring 54 ... be the configuration of compactness, and can avoid by rocking arm force application spring 54 ... contraction and the influence that produces feeds 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 rocking arm force application spring 54 ... the inboard of periphery, the 61b of this fixed bearing portion is by a fixed pivot axis 67 rotatably supports, but axial two end part at the 61b of fixed bearing portion, outstandingly respectively along the circumferentially spaced compartment of terrain be provided with a plurality of protuberances 56,57 ..., described a plurality of protuberances 56,57 ... be used to stop above-mentioned rocking arm force application spring 54 ... fall to the 61b of fixed bearing portion inclination.Thereby, both can suppress the maximization of the 61b of fixed bearing portion, can prevent rocking arm force application spring 54 again ... above-mentionedly topple over, can improve the supporting rigidity of the 61b of fixed bearing portion.

And, because raised part 56,57 ... the actuating range of avoiding second connecting rod arm 62 is configured, and therefore, although protuberance 56,57 is arranged on the 61b of fixed bearing portion, also can guarantee the actuating range of second connecting rod arm 62 fully.

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 axis 68a is set and has an axis parallel with this movable axis 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 axis 68a displacement, thereby can make the mechanism simplifying that makes movable axis 68a displacement by actuator motor 72.

Embodiment 2

Figure 12 represents the second embodiment of the present invention, for the corresponding part of above-mentioned first embodiment, give identical with reference to label.

On engine main body 10, fixed configurations is as the oil ejector 58 of oily feed unit, this oil ejector 58 is connected to first coupling shaft 64 (with reference to the first embodiment) fuel feeding on the other end of rocking arm 63 towards the end with first connecting rod arm 61, in this second embodiment, oil ejector 58 is installed in the end cap 45 of engine main body 10 in a side of cylinder ... on, and, with cylinder-bore axis plane orthogonal (plane that is parallel to the paper of Figure 12) on projection drawing on, the end of pipeline 58a is configured in the inboard of the peripheral portion of firing chamber 15.

According to this second embodiment, can make oil ejector 58 ... end, from the nearly oily donor site of a side joint of cylinder, can reduce the number of oil ejector 58, and can be reliably to the donor site fuel feeding.

More than, embodiments of the invention are illustrated, but the present invention is not limited in the foregoing description, under the situation of the present invention described in the scope that does not break away from claim, can carry out all design alterations.

Claims (7)

1. the valve device of a motor is characterized in that, comprising:

Rocking arm (63), its have the valve joint (63a) that is connected in linkage with engine valve (19) and with the cam abutting part (65) of valve driving cam (69) butt;

First connecting rod arm (61), the one end is connected with this rocking arm (63) rotationally by first coupling shaft (64), and its other end rotatably support is in the fixed position of engine main body (10);

Second connecting rod arm (62), the one end is connected with described rocking arm (63) rotationally by second coupling shaft (66), and, its the other end is rotatably supported on the displaceable movable axis (68a), wherein above-mentioned second coupling shaft (66) be disposed at first coupling shaft (64) position arranged side by side up and down on;

Driver element (72), it is connected with movable axis (68a), can make the displacement of described movable axis (68a), so that the lift amount of engine valve (19) changes continuously;

Oil feed unit (58), its fixed configurations is on engine main body (10), and coupling shaft (64) the side fuel feeding of the top in first and second coupling shafts (64,66).

2. the valve device of motor according to claim 1 is characterized in that,

Described rocking arm (63) is provided with support (63b), and this support (63b) roughly forms U word shape, and it clips the roller (65) as described cam abutting part from both sides,

One end of first connecting rod arm (61) is by first coupling shaft (64) of the axle described roller of supporting (65), and (63b) is connected rotationally with described support,

Described oily feed unit (58) is provided on the engine main body (10), and towards the faying surface fuel feeding of first connecting rod arm (61) with described support (63b).

3. the valve device of motor according to claim 1 and 2 is characterized in that,

Upward be provided with cam supporting member (46) at engine main body (10), on this cam supporting member (46), be equipped with described oily feed unit (58) in the rotatably mounted mode that is provided with the camshaft (31) of described valve driving cam (69).

4. the valve device of motor according to claim 1 and 2 is characterized in that,

Described oily feed unit is the oil ejector (58) that has spray-hole (58b) at the end of pipeline (58a), and described oily feed unit is provided on the described engine main body (10) in the both sides of cylinder.

5. the valve device of motor according to claim 3 is characterized in that,

Described oily feed unit is the oil ejector (58) that has spray-hole (58b) at the end of pipeline (58a), and described oily feed unit is provided on the described engine main body (10) in the both sides of cylinder.

6. the valve device of motor according to claim 1 and 2 is characterized in that,

Described oily feed unit is the oil ejector (58) that has spray-hole (58b) at the end of pipeline (58a), and described oily feed unit is provided on the described engine main body (10) in a side of cylinder.

7. the valve device of motor according to claim 3 is characterized in that,

Described oily feed unit is the oil ejector (58) that has spray-hole (58b) at the end of pipeline (58a), and described oily feed unit is provided on the described engine main body (10) in a side of cylinder.

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