CN100436760C - Lift-variable valve-operating system for internal combustionengine - Google Patents
Lift-variable valve-operating system for internal combustionengine Download PDFInfo
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- CN100436760C CN100436760C CNB2006101157509A CN200610115750A CN100436760C CN 100436760 C CN100436760 C CN 100436760C CN B2006101157509 A CNB2006101157509 A CN B2006101157509A CN 200610115750 A CN200610115750 A CN 200610115750A CN 100436760 C CN100436760 C CN 100436760C
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Abstract
A lift-variable valve-operating system for an internal combustion engine, comprising: subsidiary cams which are swingably supported on a movable support shaft capable of being displaced within a plane perpendicular to a rotational axis of a valve-operating cam, and which are swung following the valve-operating cam; and rocker arms each operatively connected to an engine valve and operated following the subsidiary cams, operating characteristics including a lift amount of the engine valve being changed by displacing the movable support shaft, wherein the system further includes a control arm carried in an engine body to be capable of turning about a turning axis parallel to a rotational axis of the valve-operating cam, wherein the movable support shaft having an axis parallel to the turning axis of the control arm is retained on the control arm at a location offset from the turning axis, wherein a hydraulic tappet is mounted in the control arm to support one end of each of the rocker arms, and wherein a valve abutment portion provided at the other end of each of the rocker arms is in abutment against an upper end of a stem of the engine valve. Thus, it is possible to enhance the control accuracy in a state in which the lift amount of the engine valve is controlled to be low.
Description
Technical field
The present invention relates to a kind of variable stigmatic opening transmission device of internal-combustion engine, comprise: auxiliary cam, it is supported swingably by movable fulcrum, and is driven in valve driving cam swing, wherein said movable fulcrum can with the spin axis plane orthogonal internal shift of described valve driving cam; And rocking arm, it is connected in linkage with the generator valve, and is driven in described auxiliary cam, and the variable stigmatic opening transmission device of described internal-combustion engine can make the acting characteristic that comprises lift amount of engine valve change by making described movable fulcrum displacement.
Background technique
A kind of like this variable stigmatic opening transmission device of internal-combustion engine for example in disclosing No. 10237104 specification, the special table of Japanese patent gazette 2004-521234 number and German patent application is disclosed: the rocking arm that is connected in engine valve is in linkage swung by auxiliary cam, wherein auxiliary cam is driven and is swung by the valve driving cam, changes the lift amount and the switching time of engine valve by the fulcrum that changes auxiliary cam.
But, special table of above-mentioned Japanese patent gazette 2004-521234 number and German patent application disclose in No. 10237104 disclosed device of specification; an end of rocking arm is supported swingably by the oil tappet that is arranged at cylinder head; relative therewith; auxiliary cam is by the parts carry that is different from cylinder head, even thereby the possibility that exists auxiliary cam also can change because of the influence of heat under identical operating condition in the butt position on the rocking arm.In addition, owing to be inserted with a plurality of parts between the swing fulcrum of rocking arm and the swing fulcrum of auxiliary cam as miscellaneous part, thereby there are assembly error and a size cumulative error, because described assembly error and size cumulative error can cause that also the butt position of auxiliary cam on rocking arm changes.And, in the valve device that the lift amount that makes engine valve changes, particularly under the state of low lift,, thereby may produce considerable influence to the control of lift amount because described butt position is bigger with respect to the variation ratio of lift amount.
Summary of the invention
The present invention be directed to the problems referred to above and propose, purpose is to provide a kind of variable stigmatic opening transmission device of internal-combustion engine, and it can improve the control accuracy when the lift amount with engine valve is controlled to be lower state.
In order to realize this purpose, the variable stigmatic opening transmission device of internal-combustion engine of the present invention, comprise: auxiliary cam, it is supported swingably by movable fulcrum, and being driven in the valve driving cam swings, wherein, described movable fulcrum can with the spin axis plane orthogonal internal shift of described valve driving cam; And rocking arm, it is connected in linkage with engine valve, and be driven in described auxiliary cam, the variable stigmatic opening transmission device of described internal-combustion engine is by making described movable fulcrum displacement, the acting characteristic that comprises lift amount of engine valve is changed, first of the variable stigmatic opening transmission device of described internal-combustion engine is characterised in that, at the engine main body upper support control arm is arranged, described control arm can be around the pivot axis parallel with the spin axis of described valve driving cam, on this control arm, described movable fulcrum with axis parallel with the rotation axis of this control arm remains on the position of departing from described rotation axis, and on this control arm, also be provided with oil tappet, described oil tappet supports an end of described rocking arm, is arranged at the upper end portion butt of the push rod of the valve abutting part of the other end of described rocking arm and engine valve.
Structure according to this first feature, the movable fulcrum that supports auxiliary cam swingably remains in control arm, the oil tappet of one end of support arm is arranged at control arm, therefore it is less that assembly error that produces between can the swing fulcrum with the swing fulcrum of rocking arm and auxiliary cam and size cumulative error suppress, even and because thermal expansions etc. cause dimensional changes, it is less also the variation of the butt position of auxiliary cam on rocking arm can being suppressed, thereby can improve the control accuracy when the lift amount with engine valve is controlled to be lower state.
In addition, the present invention is on the basis of above-mentioned first feature structure, second is characterised in that, the rotation axis of described control arm is disposed at the top of the push rod of described engine valve, described valve abutting part forms: when engine valve is in closed condition, along being the circular arc at center with described rotation axis, according to this structure, rotation axis is rotated even control arm rotates, also can avoid between the push rod of the valve abutting part of the other end of rocking arm and engine valve, producing bigger load change, thereby the butt that can keep valve abutting part and described push rod, and can make the rotation of following control arm and alleviate in the wearing and tearing that the contacting part of valve abutting part and described push rod produces.
The present invention is on the basis of above-mentioned second feature structure, the 3rd is characterised in that, on the projection drawing on the plane vertical with the rotation axis of described control arm, the rotation axis of described control arm is disposed in the prolongation width upward of described push rod, according to described structure, the rotation axis that can make control arm is more near the axis of the push rod of engine valve, thereby can realize the compactness of valve device.
The present invention is on the basis of above-mentioned first to the three arbitrary structure of feature, and the 4th is characterised in that, described control arm has: along separate each other at interval pair of sidewalls portion of described rotation axis; With a pair of axial region, it is outstanding from the outer surface of described two side portion that they are axis with described rotation axis, and by the engine main body rotatably support, described control arm is provided with follower, described follower is configured in the central part between the portion of described two side, drive by the drive unit that drives this control arm rotation, between this follower and described two side portion, dispose described rocking arm respectively, its part was overlapping with described follower and described side wall portion when described rocking arm was configured to side-looking, according to this structure, can prevent that the rocking arm that is supported an end by oil tappet from toppling over by follower and side wall portion, make rocking arm be easy to be assembled on the control arm, and then auxiliary cam also is assembled on the control arm easily.
The present invention is on the basis of above-mentioned the 4th feature structure, the 5th is characterised in that, described control arm has the connecting wall portion that connects integratedly between the portion of described two side, the described oil tappet that supports described rocking arm one end is arranged at described connecting wall portion, according to this structure, can in the connection rigidity of the pair of sidewalls portion that control arm had of raising, dispose oil tappet.
The present invention is on the basis of above-mentioned the 5th feature structure, the 6th is characterised in that, connecting the cam abutting part that is provided with on the auxiliary cam joint of a pair of auxiliary cam with described valve driving cam butt integratedly, between described connecting wall portion and described auxiliary cam joint, be provided with the idle running spring, described idle running is configured in spin axis quadrature with described valve driving cam with the central part of spring, and in the plane of the width direction central part by described cam abutting part, described idle running produces the elastic force of described auxiliary cam joint to the direction application of force that described cam abutting part is contacted with the valve driving cam with spring, according to this structure, dispose the idle running spring corresponding to the loading of auxiliary cam being put from the valve driving cam, thereby can be set at the spring load that dallies with spring less, use the miniaturization of spring thereby help to dally, and then help the miniaturization of valve device.
With reference to accompanying drawing and according to below the explanation of the preferred embodiment that is described in detail, come clear and definite above-mentioned, other purposes of the present invention, feature and advantage.
Description of drawings
Fig. 1～Fig. 5 represents the first embodiment of the present invention.
Fig. 1 is the major component vertical profile side view of internal-combustion engine;
Fig. 2 is the 2-2 line sectional drawing of Fig. 1;
When Fig. 3 is the high lift state along the sectional drawing of the 3-3 line among Fig. 2;
Fig. 4 is the major component exploded perspective view of valve device;
Fig. 5 is a sectional drawing corresponding with Fig. 3 when hanging down the lift state;
Fig. 6～Fig. 9 represents the second embodiment of the present invention;
Fig. 6 is the sectional drawing corresponding with Fig. 2, is the sectional drawing of the 6-6 line in Fig. 8;
Fig. 7 is the exploded perspective view of the major component of valve device;
When Fig. 8 is the high lift state along the sectional drawing of the 8-8 line among Fig. 6;
Fig. 9 is a sectional drawing corresponding with Fig. 8 when hanging down the lift state;
Figure 10 and Figure 11 represent the third embodiment of the present invention;
Figure 10 is the sectional drawing corresponding with Fig. 3;
Figure 11 is the stereogram of drive unit;
Figure 12～Figure 21 represents the fourth embodiment of the present invention;
Figure 12 is the vertical profile side view of the major component of internal-combustion engine;
Figure 13 is the direction of arrow view along the 13-13 line among Figure 12;
When Figure 14 is high valve lift state along the sectional drawing of the 14-14 line among Figure 13;
When Figure 15 is high valve lift state along the sectional drawing of the 15-15 line among Figure 13;
Figure 16 is a sectional drawing corresponding with Figure 15 when hanging down the valve lift state;
Figure 17 is the stereogram from an observed variable lift valve operating mechanism of direction;
Figure 18 is the stereogram from the observed variable lift valve operating mechanism of other direction;
Figure 19 is the stereogram from an observed control arm of direction;
Figure 20 is the stereogram from the observed control arm of other direction;
Figure 21 is the view along 21 directions of the arrow among Figure 19 and Figure 20.
Embodiment
Embodiments of the invention with reference to the accompanying drawings come embodiments of the present invention are described.
With reference to Fig. 1～Fig. 5 the first embodiment of the present invention is described, at first in Fig. 1～Fig. 4, on the cylinder head 15 of a part that constitutes engine main body 14, be equipped with a pair of intake valve 16 as engine valve, described intake valve 16 can carry out on-off action with respect to a cylinder, the valve device 17A that drives 16 switchings of two intake valves comprises: camshaft 19, and it is provided with and the corresponding respectively valve driving cam 18 of two intake valves 16; A pair of auxiliary cam 21,21, they are supported swingably by movable fulcrum 20, and be driven in each valve driving cam 18 and swing, described movable fulcrum 20 can be the plane internal shift of the orthogonal axe of camshaft 19 at the spin axis with described valve driving cam 18; A pair of rocking arm 22,22, they are connected in linkage with each intake valve 16 respectively, and are driven in described two auxiliary cams 21 respectively; Control arm 23, it is connected in movable fulcrum 20, and can around with described valve driving cam 18 rotational that is the parallel axes of described camshaft 19, and described movable fulcrum 20 remained on the position of departing from this rotation axis; And drive unit 24, it is used to drive this control arm 23 rotations, by making the acting characteristic that comprises lift amount of described movable fulcrum 20 displacements can change intake valve 16.
The push rod 16a of described two intake valves 16 is embedded in the guide cylinder 25 slidably, described guide cylinder 25 is arranged on the cylinder head 15, valve spring 28 is plugged in the set retainer 26 in the upper end of push rod 16a and is connected between the retainer 27 of cylinder head 15, by this valve spring 28, intake valve 16 quilts are towards the closing direction application of force.
Be provided with cam supporting member 29,29 in the mode that is disposed at a pair of intake valve 16 both sides on cylinder head 15, the end cap 30,30 of collaborative these cam supporting member 29 rotatably mounted described camshafts 19 is anchored on the upper surface of cam supporting member 29.
One end of two rocking arms 22,22 is supported on control arm 23 swingably by oil tappet 31.In addition, on the other end of two rocking arms 22, be provided with valve abutting part 22a, 22a with the upper end butt of the push rod 16a of described intake valve 16.In addition, be supported with first roller 33 at the intermediate portion of two rocking arms 22 by 32 of needle bearings, these first rollers 33 roll with auxiliary cam 21 respectively and contact, and described auxiliary cam 21 is corresponding with each rocking arm 22 respectively.
The rotation axis C of this control arm 23 is the top that the axis of axial region 23b is arranged at the push rod 16a of two intake valves 16, the described valve abutting part 22a that is arranged on the other end of rocking arm 22 forms: when intake valve 16 is in when closing state, be the circular arc A (dotting in Fig. 3) at center along the rotation axis C with control arm 23.
And, with the rotation axis C plane orthogonal of control arm 23 on projection drawing on, the rotation axis C of control arm 23 is configured in the prolongation width W upward (width of representing with dot and dash line among Fig. 1) of push rod 16a.
Promptly, releasably be installed on the movable fulcrum 20 of the 29a of two side portion of control arm 23 by two ends, come rotatably support two auxiliary cams 21, and with the lining 35 chimeric peripheries that are installed on movable fulcrum 20 of movable fulcrum 20 splits, and be enclosed between two auxiliary cams 21,21.
And in two auxiliary cams 21, with the axial region 23b of control arm 23 and described movable fulcrum 20 between on the corresponding part, be connected with a pair of supporting arm 21a, 21a integratedly, described a pair of supporting arm 21a, 21a form the roughly U word shape that opens wide towards camshaft 19 sides, and extend the below towards camshaft 19, on the fulcrum 38 between the top of being fixed in two supporting arm 21a, 21a, be supported with second roller 40 by 39 of needle bearings, these second rollers 40 roll with the valve driving cam 18 of camshaft 19 respectively and contact.That is, the contacting of the valve driving cam 18 by second roller 40 and camshaft 19, auxiliary cam 21,21 is driven by the rotational around movable fulcrum 20.
In addition, about described fulcrum 38, opposition side at described camshaft 19, on described two auxiliary cams 21,21, be provided with pressurized arm 21b, 21b respectively integratedly, effect has elastic force on these pressurized arms 21b, described elastic force respectively to auxiliary cam 21 to the side application of force that described second roller 40 is contacted with 18 rollings of valve driving cam.
Promptly, on second 23d of connecting wall portion that control arm 23 is had, correspond respectively to the guide cylinder 43,43 that each auxiliary cam 21 is provided with the round-ended cylinder shape integratedly, described guide cylinder 43,43 extends towards the opposition side of auxiliary cam 21, and have end wall 43a in the end of the opposition side of auxiliary cam 21, and the end wall 43a of the fitting 44 of the pressurized arm 21b butt of described auxiliary cam 21 and guide cylinder 43 between compression idle running being set with spring 45.
In addition, lower surface at auxiliary cam 21 is provided with the bearing surface 46 that rolls and contact with first roller 33 of rocking arm 22, this bearing surface 46 constitutes by lift portion 46a is linked to each other with the 46b of basic circle portion, described lift portion 46a is used to drive rocking arm 22 and rotates, the 46b of basic circle portion maintenance is equidistant with the distance of the axis of movable fulcrum 20, so that make rocking arm 22 remain state of rest, lift portion 46a forms linearly extension, and, when auxiliary cam 21 rotated along with the rotation of valve driving cam 18, the distance between the axis of the point of contact of first roller 33 of lift portion 46a and rocking arm 22 and movable fulcrum 20 increased gradually.
In first 23c of connecting wall portion that control arm 23 is had, be provided with the tappet installation tube portion 47 of bottom tube-like integratedly in the part corresponding with described rocking arm 22, tappet installation tube portion 47 extends towards the opposition side of described movable fulcrum 20, and the end at the opposition side of movable fulcrum 20 has end wall 47a, in these tappet installation tube portions 47 oil tappet 31 is installed.
And, on control arm 23, be provided with extend to always axial region 23b, be used for the lead oil pressure road 54 of described oil tappet 31 of oil pressure, oil pressure offers described oil pressure road 54 from cylinder head 15 via described axial region 23b.
And, on first 23c of connecting wall portion that control arm 23 is had, be provided with the tooth sector 59 as follower of the central part that is disposed between the 23a of two side portion, a pair of rocking arm 22 is configured in respectively between the 23a of two side portion and described tooth sector 59 of control wall 23, and their part and described tooth sector 59 and the 23a of two side portion is overlapping when being configured to side-looking.
In the interior week of cam supporting member 29 and end cap 30, part at the described live axle 56 of supporting is provided with the annular recessed portion 61 that is communicated with the oily passage 60 of cam supporting member 29, on live axle 56, be provided with and be the oily passage 62 that the straight line shape extends, and be provided with the intercommunicating pore 63 that this oil passage 62 is communicated with described annular recessed portion 61, be provided with the spraying hole 64 that is used for spraying the oil in the oily passage 62 on the live axle 56 in addition, using with the engaging piece of tooth sector 59 is lubricated for actuation gear 57 from the oil of spraying hole 64 ejections to the actuation gear 57 and the engaging piece of tooth sector 59.
When making control arm 23 be disposed at position shown in Figure 3 by described drive unit 24, the upper end of the push rod 16a of intake valve 16, by in the lift portion 46a of the bearing surface 46 of the auxiliary cam 21 of the rotational of movable fulcrum 20, the end of the 46b of basic circle portion opposition side, driven towards opening direction, under this state, the lift amount h maximum of intake valve 16.In addition, when control arm 23 is rotated as shown in Figure 5 upward, for example make the 46b of the basic circle portion butt of the bearing surface 46 of the upper end of push rod 16a of intake valve 16 and auxiliary cam 21, the lift amount h minimum (=0) of intake valve 16 under this state.
That is, by being rotated by drive unit 24 drive controlling arms 23, the lift amount of intake valve 16 changes, and passes through the rotating drive of control arm 23, and valve driving cam 18 also changes with the timing that second roller 40 contacts, and the switching of intake valve 16 regularly changes thus.
Effect to this first embodiment describes below, control arm 23 is supported on the cylinder head 14 of engine main body 14, and can be around the pivot axis parallel with the spin axis of valve driving cam 18, on this control arm 23, movable fulcrum 20 with axis parallel with the rotation axis C of this control arm 23 remains on the position of departing from described rotation axis C, and this control arm 23 is provided with the oil tappet 31 of an end of support arm 22, and the valve abutting part 22a that is arranged at rocking arm 22 the other end is connected to the upper end portion of the push rod 16a of intake valve 16.
Promptly, the movable fulcrum 20 that supports auxiliary cam 21 swingably remains on the control arm 23, the oil tappet 31 of one end of support arm 22 is located at control arm 23, therefore assembly error and the size cumulative error that produces between the swing fulcrum of the swing fulcrum of rocking arm 22 and auxiliary cam 21 can be suppressed for less, even and owing to thermal expansion etc. causes dimensional changes, also auxiliary cam 21 variation with the butt position of rocking arm 22 can be suppressed for less, thus the control accuracy can improve lift amount with intake valve 16 and be controlled to be low state the time.
In addition, the rotation axis C of control arm 23 is disposed at the top of the valve stem 16a of intake valve 16, be arranged at rocking arm 22 and form: when intake valve 16 is in closed condition with the valve abutting part 22a of the upper end butt of described push rod 16a, along being the circular arc A at center with rotation axis C, therefore even the control arm 23 rotation axis C that rotates rotates, produce bigger load change between the valve abutting part 22a that also can avoid and the push rod 16a of intake valve 16 at rocking arm 22, the butt of valve abutting part 22a and push rod 16a can be kept, and the rotation of following control arm 23 can be reduced and the wearing and tearing that produce at the contacting part of valve abutting part 22a and push rod 16a.
In addition, with the rotation axis C plane orthogonal of control arm 23 on projection drawing on, the rotation axis C of control arm 23 is disposed in the prolongation width W upward of push rod 16a, the rotation axis C that therefore can make control arm 23 can realize the compactness of valve device 17A more near the axis of the push rod 16a of intake valve 16.
In addition, control arm 23 comprises: along separate each other at interval the 23a of pair of sidewalls portion of its rotation axis C; With a pair of axial region 23b, they are that axis is outstanding from the outer surface of the 23a of two side portion with rotation axis C, and by cam supporting member 29 rotatably supports of cylinder head 15, on control arm 23, be provided with tooth sector 59, this tooth sector 59 is disposed at the central part between the 23a of two side portion, and by driving drive unit 24 drivings that this control arm 23 rotates, dispose rocking arm 22 between this tooth sector 59 and the described two side 23a of portion, its part was overlapping with tooth sector 59 and described side wall portion 23a when rocking arm 22 was configured to side-looking.
Therefore can prevent that by tooth sector 59 and side wall portion 23a the rocking arm 22 that supports an end by oil tappet 31 from toppling over, make rocking arm 22 be assembled to this control arm 23 easily, and then make auxiliary cam 21 be assembled to control arm 23 easily.
And control arm 23 has first 23c of connecting wall portion between the end that connects the 23a of two side portion integratedly, the oil tappet 31 of one end of support arm 22 is arranged at first 23c of connecting wall portion, therefore can dispose oil tappet 31 in the connection rigidity of the 23a of pair of sidewalls portion that raising control arm 23 is had.
In addition, the movable fulcrum 20 that supports auxiliary cam 21,21 swingably releasably is installed on control arm 23, does not therefore unload lower shake-changing arm 22 structure members such as grade, just can carry out the charge and discharge operations of auxiliary cam 21, makes the replacing operation of part become easy.
In addition, supporting the periphery of the movable fulcrum 20 of a pair of auxiliary cam 21,21 swingably, to be plugged in the chimeric lining 35 that is equipped with movable fulcrum 20 splits of mode between two auxiliary cams 21,21, therefore can simplify the shape of movable fulcrum 20, and can limit in the position on the direction of the axis of movable fulcrum 20 each auxiliary cam 21.
Fig. 6～Fig. 9 represents the second embodiment of the present invention, and the part corresponding with above-mentioned first embodiment is marked with identical reference marks, and detailed.
Driving the valve device 17B that two intake valves 16 open and close comprises: camshaft 69, and it is provided with by a shared valve driving cam 68 of two intake valves 16; A pair of auxiliary cam 71,71, they are supported swingably by movable fulcrum 20, and are driven in valve driving cam 68 swing, and described movable fulcrum 20 can be to move in the plane of orthogonal axe of camshaft 69 at the rotation axis with described valve driving cam 68; A pair of rocking arm 22,22, they are connected respectively in linkage with each intake valve 16, and are driven in described two auxiliary cams 71 respectively; Control arm 73, its can around with the rotational of the parallel axes of described valve driving cam 68, and described movable fulcrum 20 remained on the position of departing from its rotation axis C; And the drive unit 24 that drives these control arm 73 rotations.
One end of two rocking arms 22 is supported on control arm 73 swingably by oil tappet 31.In addition, first roller 33 that is supported on the intermediate portion of two rocking arms 22 by 32 of needle bearings rolls with auxiliary cam 71 respectively and contacts, and described auxiliary cam 71 corresponds respectively to each rocking arm 22.
The rotation axis C of this control arm 73 is the top that the axis of axial region 73b is disposed at the push rod 16a of two intake valves 16.And, with the rotation axis C plane orthogonal of control arm 73 on projection drawing on, the rotation axis C of control arm 73 is disposed in the prolongation width W upward (width among Fig. 8 shown in the dot and dash line) of push rod 16a.
And, two auxiliary cams 71 connect as one by auxiliary cam joint 74, fulcrum 75 is fixed on the support 74a of the roughly U word shape that is arranged on this auxiliary cam joint 74, and being supported on this fulcrum 75 by 76 of needle bearings as the roller 77 of cam abutting part, this roller 77 rolls with the valve driving cam 68 of camshaft 69 and contacts.That is, the contacting of the valve driving cam 68 by roller 77 and camshaft 69, a pair of auxiliary cam 71 is driven by the rotational around movable fulcrum 20.
In addition, auxiliary cam joint 74 is by dallying with spring 78 quilts towards the side application of force that roller 77 is contacted with valve driving cam 68, this idle running is arranged between first 73c of connecting wall portion and auxiliary cam joint 74 of control arm 73 with spring 78, and its central part is configured in the plane with the spin axis quadrature of valve driving cam 68 and the width direction central part by described roller 77.
Promptly on described auxiliary cam joint 74, be provided with pressurized arm 71b integratedly, and the fitting 79 of this pressurized arm 71b butt and first 73c of connecting wall portion that control arm 73 is had between, compression being provided with idle running with spring 78.
In addition, the same with above-mentioned first embodiment, lower surface at auxiliary cam 71 is provided with the bearing surface 46 that rolls and contact with first roller 33 of rocking arm 22, this bearing surface 46 constitutes by lift portion 46a is linked to each other with the 46b of basic circle portion, lift portion 46a is used to drive rocking arm 22 and rotates, it is equidistant that the 46b of basic circle portion keeps its distance with the axis of movable fulcrum 20, so that rocking arm 22 is remained state of rest.
On first 73c of connecting wall portion that control arm 73 is had, be provided with the tappet installation tube portion 47 of bottom tube-like integratedly in the part corresponding with described rocking arm 22, tappet installation tube portion 47 extends towards the opposition side of described movable fulcrum 20, and the opposition side at movable fulcrum 20 has end wall 47a, in these tappet installation tube portions 47 oil tappet 31 is installed.
In addition, on first 73c of connecting wall portion that control arm 73 is had, drive by drive unit 24, be provided with in the mode that is disposed at the central part between the 73a of two side portion as the tooth sector 59 of follower, a pair of rocking arm 22 is disposed at respectively between the 73a of two side portion and described tooth sector 59 of control arm 73, and this a pair of rocking arm 22 to be configured to when side-looking their part and described tooth sector 59 and the 73a of two side portion overlapping.
When control arm 73 is disposed at position shown in Figure 8 by described drive unit 24, the upper end of the push rod 16a of intake valve 16 is passed through in the lift portion 46a of the bearing surface 46 of the auxiliary cam 71 of the rotational of movable fulcrum 20, the end of the 46b of basic circle portion opposition side, driven towards opening direction, under this state, the lift amount h maximum of intake valve 16.In addition, when control arm 73 is rotated as shown in Figure 9 upward, for example, the 46b of the basic circle portion butt of the upper end of the push rod 16a of intake valve 16 and the bearing surface 46 of auxiliary cam 71, the lift amount h minimum (=0) of intake valve 16 under this state.
That is, by being rotated by drive unit 24 drive controlling arms 73, the lift amount of intake valve 16 changes, and passes through the rotating drive of control arm 73, and the timing that valve driving cam 68 contacts with roller 77 also changes, thereby the switching of intake valve 16 regularly also changes.
According to this second embodiment, can receive same effect with above-mentioned first embodiment, and, connecting integratedly on the auxiliary cam joint 74 of a pair of auxiliary cam 71, axle is supported with the roller 77 that is connected to valve driving cam 68, idle running produces the elastic force of auxiliary cam joint 74 to the side application of force that this roller 77 is contacted with valve driving cam 68 with spring 78, idle running is arranged between first 73c of connecting wall portion and auxiliary cam joint 74 of control arm 73 with spring 78, and make its central part be configured in spin axis quadrature with valve driving cam 68, and in the plane of the width direction central part by described roller 77, therefore by disposing idle running spring 78 corresponding to putting from the loading of 68 pairs of auxiliary cams 71 of valve driving cam, can be set at the spring load that dallies with spring 78 less, use the miniaturization of spring 78 thereby help to dally, and then help the miniaturization of valve device.
Figure 10 and Figure 11 represent third embodiment of the invention, and the part corresponding with above-mentioned first embodiment is marked with identical reference marks, and detailed.
The valve device 17C that drives a pair of intake valve 16 switchings comprises: camshaft 19, and it is provided with the valve driving cam 18 that corresponds respectively to two intake valves 16; A pair of auxiliary cam 21, they are supported swingably by movable fulcrum 20, and are driven in each valve driving cam 18 and swing, and described movable fulcrum 20 can be to move in the plane of orthogonal axe of camshaft 19 at the spin axis with described valve driving cam 18; A pair of rocking arm 22, they are connected in each intake valve 16 respectively in linkage, and are driven in described two auxiliary cams 21 respectively; Control arm 23, it is connected in movable fulcrum 20, and can around with described valve driving cam 18 rotational that is the parallel axes of described camshaft 19, and this control arm 23 remains on described movable fulcrum 20 on the position of departing from its rotation axis; And the drive unit 84 that drives these control arm 23 rotations.
Described drive unit 84 comprises live axle 85 and motor 58, and live axle 85 has integratedly: a pair of axial region 85a, 85a, and they are rotatably supported between cam supporting member 29 shown in first embodiment and the end cap 30; Connect the 85b of connecting wall portion between the eccentric position of these axial regions 85a; Form C word shape roughly and be arranged at the clamping part 85c of the central part of the described connecting wall 85b of portion; One among described motor 58 and the described two axial region 85a is connected, and the follower 86 that drives by this drive unit 84 is arranged at first 23c of connecting wall portion of control arm 23 in the mode that is disposed at the central part between the 23a of two side portion.
And on first 23c of connecting wall portion of control arm 23, follower 86 constitutes and comprises: a pair of supporting arm 87,87 that is integrally formed at the intermediate portion between the 23a of two side portion towards the top with extending; And be bearing in roller 90 on the fulcrum 88 by 89 of needle bearings, and fulcrum 88 is arranged between the top of these supporting arms 87, and roller 90 is by the clamping part 85c clamping of described drive unit 84.
And by the rotational of live axle 85 around axial region 85a, the rocking arm 23 rotation axis C that rotates rotates, thereby the acting characteristic that comprises lift amount of intake valve 16 changes.
In addition, a pair of rocking arm 22 is configured in respectively between the 23a of two side portion and described follower 88 of control arm 23, and a part that is configured to them when side-looking and described follower 88 and the 23a of two side portion overlapping.
According to the 3rd embodiment, also can obtain same effect with above-mentioned first embodiment.
According to Figure 12～Figure 21 fourth embodiment of the invention is described below.
As Figure 12 and shown in Figure 13, corresponding each cylinder can be provided with a pair of intake valve 112,112 with opening and closing on the cylinder head 111 of internal-combustion engine, and the variable lift valve operating mechanism 113 that drives these intake valves 112,112 switchings comprises: the camshaft 115 that is provided with valve driving cam 114; Control arm 117, it is supported in axis hole 111b, the 111b of a pair of abutment wall 111a, the 111a that are provided with on cylinder head 111 swingably by axial region 116,116 respectively; Be provided with the Control Shaft 119 of the control cam 118 that makes control arm 117 swings; Auxiliary cam 121, it is supported on control arm 117 swingably by movable fulcrum 120, and is driven in 114 swings of valve driving cam; And a pair of rocking arm 122,122, they are connected in intake valve 112,112 respectively in linkage, and are driven in auxiliary cam 121 respectively, by making described movable fulcrum 120 displacements, the acting characteristic that comprises valve lift of intake valve 112,112 are changed.
According to Figure 19～Figure 21 the shape of control arm 117 is described below.
Outstandingly integratedly on the side wall portion 127,127 of control arm 117 be provided with described axial region 116,116, be formed with in addition and be used to axis hole 127a, 127a that described movable fulcrum 120 is pressed into.The first connecting wall portion 128 and the second connecting wall portion 129 of control arm 117 connect as one by partition wall portion 130, and by the enhancement effect of this second connecting wall portion 129, the rigidity of control arm 117 further improves.
Pair of sidewalls portion 127,127 and partition wall portion 130 extend parallel to each other, and are formed with two rocking arm accepting hole 117a, 117a between them.The position near the first connecting wall portion 128 in partition wall portion 130 has upwards erected a pair of roller bearing 130a of portion, 130a, is formed for axis hole 130b, 130b that Roller Shaft 147 described later is pressed on the 130a of these roller bearing portions, 130a.Be formed with roller and accommodate recess 130c between a pair of roller bearing 130a of portion, 130a, the part that this roller is accommodated the diapire of recess 130c is made of the described first connecting wall portion 128.
Be formed with a pair of oil tappet mounting hole 128a, 128a towards rocking arm accepting hole 117a, 117a in the first connecting wall portion 128, oil tappet mounting hole 128a, 128a are used to install oil tappet 131,131 described later.The first connecting wall portion 128 is formed with oil drainage hole 128b, the 128b that is communicated in oil tappet mounting hole 128a, 128a, and the oil of discharging from oil tappet 131,131 drips downwards through oil drainage hole 128b, 128b.In addition, in the second connecting wall portion 129, be formed with the force application device mounting hole 129a that is used to install force application device 142 described later.
Shown in Figure 13～18; rocking arm the 122, the 122nd, the rocking arm that does not have the type of pitman arm shaft; the recess 122a that is formed at the one end is supported on the spherical bearing 131a on the top of oil tappet 131 swingably; wherein said oil tappet 131 is installed among the oil tappet mounting hole 128a of the described first connecting wall portion 128; and rocking arm 122,122 drives intake valve 112 by its other end.Promptly, on the other end of rocking arm 122, be supported with the butt parts 132 of the upper end of the push rod 112a that is connected to intake valve 112 slidably, adjust by the position of adjusting screw 133 and 134 pairs of these butt parts 132 of lock nut, thereby can adjust a state that falls of intake valve 112.Roller 137 is rotatably supported in Roller Shaft 135 by ball bearing 136, and this Roller Shaft 135 is set up among the roller accepting hole 122b of the intermediate portion that is formed on rocking arm 122.
Rocking arm 122,122 is chimeric to be housed among rocking arm accepting hole 117a, the 117a by pair of sidewalls portion 127,127 and partition wall portion 130 clampings of control arm 117.The rocking arm 122 that does not have pitman arm shaft only supports and is: the one end is connected to oil tappet 131, its the other end is connected to the push rod 112a of intake valve 112, and the roller 137 of central authorities is connected to auxiliary cam 121, therefore, its attitude is unstable and topple over easily, so may cause the assembling work difficulty.But, in the present embodiment, being clipped between side wall portion 127,127 and the partition wall portion 130 by the both sides that make rocking arm 122,122 in case topple over, it is easy that its assembling work becomes.
Be pressed into fulcrum 138 among axis hole 127a, the 127a that in the pair of sidewalls portion 127,127 of control arm 117, forms, on this fulcrum 138, be supported with auxiliary cam 121 swingably.On the first arm 121a outstanding, be supported with roller 141, this roller 141 and valve driving cam 114 butts that are arranged at camshaft 115 by Roller Shaft 139 and ball bearing 140 from the axial central part of auxiliary cam 121.In addition, be formed with camming surface 121c, 121c from the axial two end part of the auxiliary cam 121 outstanding a pair of second arm 121b, 121b, butt has the roller 137,137 of described rocking arm 122,122 on these camming surfaces 121c, 121c.
The roller 141 that generation makes auxiliary cam 121 is installed among the force application device mounting hole 129a with the force application device 142 of the elastic force of valve driving cam 114 butts, and described force application device mounting hole 129a is formed at the second connecting wall portion 129 of control arm 117.Force application device 142 constitutes and comprises: be pressed into the guide cylinder 143 among the force application device mounting hole 129a of the second connecting wall portion 129; Be embedded in the push part 144 in the guide cylinder 143 slidably; Be arranged at push part 144 the upper end and with the abutting part 145 of the lower surface butt of the first arm 121a of auxiliary cam 121; And compression is arranged between guide cylinder 143 and the abutting part 145 and to the helical spring 146 of push part 144 to the projected direction application of force.
The part that connects the second connecting wall portion 129 and partition wall portion 130 in the control arm 117 is the part of high rigidity, by at this part supporting force application device 142, the bending deflection of the control arm 117 that the counter-force of the active force that applies owing to 142 pairs of auxiliary cams 121 of force application device can be caused is suppressed to inferior limit.In addition, the roller 141 of force application device 142, auxiliary cam 121 and valve driving cam 114 are configured in the same plane with the line quadrature of bank of cylinder (in the paper of Figure 15).By this configuration, load from valve driving cam 114 can be to the direction that control arm 117 is toppled over (direction that the paper of relative Figure 15 tilts) effect with the load from force application device 142, thereby the bending deflection of control arm 117 can be suppressed to inferior limit, can improve the control accuracy of the valve lift of intake valve 112,112.
Accommodate at the roller of the central authorities of the partition wall portion 130 that is formed at control arm 117 and to contain roller 149 among the recess 130c, this roller 149 is rotatably supported in Roller Shaft 147 by ball bearing 148, and this Roller Shaft 147 is pressed among axis hole 130b, the 130b of the 130a of roller bearing portion, 130a.Control Shaft 119 back and forth rotates by the actuator 150 that is made of motor, so that press-on roller 149 makes control arm 117 around axial region 116,116 swings, be provided with control cam 118 on this Control Shaft 119, this control cam 118 has the camming surface that is made of involute.In Figure 14～Figure 16, when Control Shaft 119 rotates to clockwise direction, control arm 117 around axial region 116,116 to swing counterclockwise, when Control Shaft 119 when counter clockwise direction is rotated, control arm 117 is swung to clockwise direction around axial region 116,116.
As mentioned above, owing to utilize the partition wall portion 130 of control arm 117 to come supporting roller 149, therefore do not need to be used for the special-purpose member of supporting roller 149, thereby can reduce number of spare parts and simplified structure.Particularly accommodate roller 149 among the recess 130c owing to accommodating at the roller of the partition wall portion 130 that is formed at control arm 117, therefore the installing space of roller 149 is guaranteed in the space that can utilize roller to accommodate recess 130c, and can accommodate the enhancement effect of the first connecting wall portion 128 of the diapire of recess 130c by constituting this roller, will accommodate the rigidity of the control arm 117 that recess 130c causes and reduce and be suppressed at inferior limit owing to roller is set.
In addition, owing to make roller 149 and control cam 118 butts by 151 pairs of control arm 117 application of forces of force application device, therefore can prevent that roller 149 from floating from control cam 118, thereby make the action of control arm 117 stable, can improve the control accuracy of the valve lift of intake valve 112,112.
In addition, owing to push the connection first connecting wall portion 128 in the control arm 117 and the position of partition wall portion 130 by force application device 151, it particularly is the position of a pair of oil tappet 131,131 clampings of the first connecting wall portion 128 that is supported in, promptly push the higher part of rigidity of control arm 117, therefore control arm 117 bendings can be prevented by the pushing force of force application device 151, thereby the control accuracy of the valve lift of intake valve 112,112 can be further improved.
Especially, control cam 118, roller 149 with the control arm 117 of its butt, and to the force application device 151 of control arm 117 towards the direction application of force that makes roller 149 and control cam 118 butts, be disposed in the same plane with the line quadrature of bank of cylinder (in the paper of Figure 15), therefore can not act on direction that control arm 117 is toppled over (direction that tilts with respect to the paper of Figure 15) from the load of control cam 118 and load from force application device 151, thereby the bending deflection of control arm 117 can be suppressed at inferior limit, can improve intake valve 112, the control accuracy of 112 valve lift.
In addition, because configuration force application device 151 below the cylinder-bore axis direction of oil tappet 131,131, the oil of discharging from oil tappet 131,131 is dripped downwards from oil drainage hole 128b, the 128b of the first connecting wall portion 128, thereby can be lubricated effectively force application device 151.
As shown in Figure 12: the spark plug receiving cartridge 156 of loading and unloading of guiding spark plug 155 is pressed in the cylinder head 111, and the described guide cylinder 152 integrally formed with this spark plug receiving cartridge 156 also is pressed into cylinder head 111.Like this,, can improve the rigidity of this force application device 151, can make the action of control arm 117 more stable by guide cylinder 152 and spark plug receiving cartridge 156 are formed as one.
By Figure 12 and Figure 13 as can be known: spark plug receiving cartridge 156 utilizes recess 128c in the first connecting wall portion 128 that is formed on control arm 117, promptly is configured by the space of the part clamping of supporting a pair of oil tappet 131,131 in the first connecting wall portion 128.The interference of control arm 117 and spark plug receiving cartridge 156 can be avoided by this structure,, the compactness of variable lift valve operating mechanism 113 can be realized by making their as far as possible near configuration.
And, when control arm 117 is disposed at Figure 14 and position shown in Figure 15 by control cam 118, when promptly controlling the top lift portion of cam 118 and roller 149 butts, tip side (away from a side of movable fulcrum 120) around camming surface 121c, the 121c of the auxiliary cam 121 of the axis of movable fulcrum 120 swing, roller 137,137 butts with rocking arm 122,122, make the angle of oscillation of rocking arm 122,122 increase, thereby it is maximum that the valve lift of intake valve 112,112 reaches.
In addition, when control arm 117 is in position shown in Figure 16 by control cam 118, when promptly controlling the minimum lift portion of cam 118 and roller 149 butts, terminal side (near a side of movable fulcrum 120) around camming surface 121c, the 121c of the auxiliary cam 121 of the axis of movable fulcrum 120 swing, roller 137,137 butts with rocking arm 122,122, make the angle of oscillation of rocking arm 122,122 reduce, thereby the valve lift of intake valve 112,112 reach minimum (zero).
Like this, by making control arm 117 around axial region 116,116 swings, the valve lift of intake valve 112,112 changes, and the driving by control arm 117, valve driving cam 114,114 also changes with the timing that roller 141,141 contacts, thereby the switching of intake valve 112,112 regularly also changes.
More than the embodiment of the invention is illustrated, but the present invention is not limited to the foregoing description, in the scope that does not break away from claims of the present invention of the present invention, can carry out various design alterations.
For example in the above-described embodiments the valve device of intake valve 16 is illustrated, but the present invention also is applicable to the valve device as the exhaust valve of engine valve.
In the 4th embodiment, constitute the cam follower of the control arm 117 of 118 butts of control cam by roller 149, but also can use slide block to constitute in addition.
Claims (6)
1. the variable stigmatic opening transmission device of an internal-combustion engine, it comprises: auxiliary cam (21,71), it is supported swingably by movable fulcrum (20), and being driven in valve driving cam (18,68) swings, wherein, described movable fulcrum (20) can with the spin axis plane orthogonal internal shift of described valve driving cam (18,68); And rocking arm (22), it is connected in linkage with engine valve (16), and be driven in described auxiliary cam (21,71), the variable stigmatic opening transmission device of described internal-combustion engine is by making described movable fulcrum (20) displacement, the acting characteristic that comprises lift amount of engine valve (16) is changed, the variable stigmatic opening transmission device of described internal-combustion engine is characterised in that
At engine main body (14) upper support control arm (23 is arranged, 73), described control arm (23,73) can around with described valve driving cam (18,68) pivot axis that spin axis is parallel, at this control arm (23,73) on, have and this control arm (23, the described movable fulcrum (20) of the axis that rotation axis 73) is parallel remains on the position of departing from described rotation axis, and at this control arm (23,73) also be provided with oil tappet (31) on, described oil tappet (31) supports an end of described rocking arm (22), is arranged at the upper end portion butt of push rod (16a) of valve abutting part (22a) and engine valve (16) of the other end of described rocking arm (22).
2. variable stigmatic opening transmission device according to claim 1 is characterized in that,
The rotation axis of described control arm (23,73) is disposed at the top of the push rod (16a) of described engine valve (16), and described valve abutting part (22a) forms: engine valve (16) when being in closed condition along being the circular arc at center with described rotation axis.
3. variable stigmatic opening transmission device according to claim 2 is characterized in that,
With the rotation axis plane orthogonal of described control arm (23,73) on projection drawing on, the rotation axis of described control arm (23,73) is disposed in the prolongation width upward of described push rod (16a).
4. according to each the described variable stigmatic opening transmission device in the claim 1 to 3, it is characterized in that,
Described control arm (23,73) has: along separate each other at interval pair of sidewalls portion (23a, 73a) of described rotation axis; With a pair of axial region (23b, 73b), they are axis with described rotation axis, and from the described two side (23a of portion, outer surface 73a) is outstanding, and by engine main body (14) rotatably support, at described control arm (23,73) be provided with follower (59,86), described follower (59,86) be configured in the described two side (23a of portion, central part 73a), by driving this control arm (23,73) drive unit (24 of Zhuan Donging, 84) drive, at this follower (59,86) with the described two side (23a of portion, dispose described rocking arm (22) 73a) respectively, described rocking arm (22) is its part and described follower (59,86) and described side wall portion (23a when being configured to side-looking, 73a) overlapping.
5. variable stigmatic opening transmission device according to claim 4 is characterized in that,
Described control arm (23,73) has the connecting wall portion (23c, 73c) that connects integratedly between the described two side portion (23a, 73a), and the described oil tappet (31) that supports described rocking arm (22) one ends is arranged at described connecting wall portion (23c, 73c).
6. variable stigmatic opening transmission device according to claim 5 is characterized in that,
Connecting the cam abutting part (77) that is provided with on the auxiliary cam joint (74) of a pair of auxiliary cam (71) with described valve driving cam (68) butt integratedly, dispose idle running spring (78) between described connecting wall portion (73c) and the described auxiliary cam joint (74), described idle running is configured in spin axis quadrature with described valve driving cam (68) with the central part of spring (78), and in the plane of the width direction central part by described cam abutting part (77), described idle running produces the elastic force of described auxiliary cam joint (74) to the direction application of force that makes described cam abutting part (77) and valve driving cam (68) butt with spring (78).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005235190 | 2005-08-15 | ||
| JP2005235190 | 2005-08-15 | ||
| JP2006197254 | 2006-07-19 | ||
| JP2006197252 | 2006-07-19 |
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| CN1916374A CN1916374A (en) | 2007-02-21 |
| CN100436760C true CN100436760C (en) | 2008-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101157509A Expired - Fee Related CN100436760C (en) | 2005-08-15 | 2006-08-15 | Lift-variable valve-operating system for internal combustionengine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101550853B (en) * | 2009-05-08 | 2011-04-06 | 上海汽车集团股份有限公司 | Engine air valve continuously variable driving mechanism |
| CN102140944B (en) * | 2011-03-16 | 2012-09-05 | 奇瑞汽车股份有限公司 | Eccentric shaft control system of complete-variable air valve lift mechanism |
| CN102966406B (en) * | 2012-11-25 | 2015-06-03 | 天津大学 | Cam mechanism controlled by using double swinging arms |
| JP6100298B2 (en) * | 2015-03-24 | 2017-03-22 | 株式会社オティックス | Variable valve mechanism for internal combustion engine |
| DE102017003439A1 (en) * | 2017-04-08 | 2018-10-11 | Man Truck & Bus Ag | Variable valve train |
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|---|---|---|---|---|
| JPS59201913A (en) * | 1983-04-28 | 1984-11-15 | Mazda Motor Corp | Device making engine valve inoperative |
| US20020053326A1 (en) * | 2000-12-11 | 2002-05-09 | Joachim Seitz | Switchable support element |
| WO2004009967A1 (en) * | 2002-07-18 | 2004-01-29 | Ift Hungaria Kft. | A mechanism for varynig the valve stroke of an internal combustion piston engine |
| DE10237104A1 (en) * | 2002-08-13 | 2004-02-26 | Bayerische Motoren Werke Ag | Valve drive for a piston combustion engine has a variable lift control with transmission and actuator elements fixed together |
| US20040261737A1 (en) * | 2003-06-26 | 2004-12-30 | Rohe Jeffrey D. | Variable valve actuation mechanism having an integrated rocker arm, input cam follower and output cam body |
| WO2005061864A1 (en) * | 2003-12-24 | 2005-07-07 | Honda Motor Co., Ltd. | Variable valve lift device of internal combustion engine |
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2006
- 2006-08-15 CN CNB2006101157509A patent/CN100436760C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59201913A (en) * | 1983-04-28 | 1984-11-15 | Mazda Motor Corp | Device making engine valve inoperative |
| US20020053326A1 (en) * | 2000-12-11 | 2002-05-09 | Joachim Seitz | Switchable support element |
| WO2004009967A1 (en) * | 2002-07-18 | 2004-01-29 | Ift Hungaria Kft. | A mechanism for varynig the valve stroke of an internal combustion piston engine |
| DE10237104A1 (en) * | 2002-08-13 | 2004-02-26 | Bayerische Motoren Werke Ag | Valve drive for a piston combustion engine has a variable lift control with transmission and actuator elements fixed together |
| US20040261737A1 (en) * | 2003-06-26 | 2004-12-30 | Rohe Jeffrey D. | Variable valve actuation mechanism having an integrated rocker arm, input cam follower and output cam body |
| WO2005061864A1 (en) * | 2003-12-24 | 2005-07-07 | Honda Motor Co., Ltd. | Variable valve lift device of internal combustion engine |
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