CN1590715A - Air valve device for multi-cylinder engine - Google Patents
Air valve device for multi-cylinder engine Download PDFInfo
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- CN1590715A CN1590715A CN 200410074235 CN200410074235A CN1590715A CN 1590715 A CN1590715 A CN 1590715A CN 200410074235 CN200410074235 CN 200410074235 CN 200410074235 A CN200410074235 A CN 200410074235A CN 1590715 A CN1590715 A CN 1590715A
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Abstract
To obtain a desirable valve lift quantity even if a cam shaft is tilted in a valve system for a multi-cylinder engine wherein tilting angle of the cam shaft against the center line of a cylinder is different when adjusting a valve head clearance between a locker arm and when operating the valve in the valve opening direction with the locker arm to open the valve in one of an intake valve and an exhaust valve. Profile of a valve driving part of valve system cams 32 and 33 corresponding to one valve, of which tilting angle against the cylinder center line CL of a cam shaft 31 when adjusting a valve head clearance is different from that when operating to open the valve, and profile of the valve driving part of the valve system cams 32 and 33 corresponding to the valve, of which tilting angle against the cylinder center line CL of the cam shaft 31 when adjusting the valve head clearance is the same with that when opening the valve, are set different from each other so that both the intake valves 18 or both the exhaust valves 19 has the same valve lift quantity.
Description
Technical field
The present invention relates to a kind of valve gear of multicylinder engine, in this valve gear, with the valve spring of reaction force acts on camshaft is corresponding degree in crank angle and definite, corresponding therewith, camshaft changes with respect to the tilt angle of the cylinder center at the center that connects each cylinder, thereby be arranged on the cylinder cap of each cylinder of a plurality of cylinders and can carry out in the intake valve and a part of valve in the exhaust valve of on-off action, camshaft is with respect to the tilt angle of the cylinder center at the center that connects a plurality of cylinders, thereby is in mutually different state when the valve head gap of adjusting between valve and rocking arm and by rocking arm above-mentioned valve being applied when valve is opened in the effect of the direction of opening valve.
Background technique
In a part of intake valve and exhaust valve that in a plurality of cylinders, are provided with respectively, when adjusting valve head gap and valve and open, be in the valve gear of the multicylinder engine under the various different conditions with respect to the tilt angle of the camshaft of cylinder center, for example, in patent documentation 1 grade, disclose.In this device, because the above-mentioned tilt angle of camshaft changes, also big when adjusting of the gap of valve head when valve is worked for therefore the sound that prevents tappet increase, will change the shape of buffer curve part in the profile of the valve actuation part on the valve cam.
Patent documentation 1 real fair 6-45602 communique
; in above-mentioned device in the past; existence do not prevent that because the inclination of camshaft the valve head gap changes and causes the variation of valve lift when adjusting the valve head gap when valve work, so still can not obtain the situation of desirable valve lift owing to the inclination of camshaft.
Summary of the invention
The present invention is because these situations and putting forward, although its objective is and provide a kind of camshaft to tilt, still can obtain the valve gear of the multicylinder engine of desired valve lift.
For achieving the above object, the invention of being put down in writing in the claim 1 is a kind of valve gear of multicylinder engine, has: intake valve and exhaust valve, and they are for each cylinder in a plurality of cylinders of arranged in series, are arranged on the cylinder head and can carry out on-off action; Valve spring, its respectively to intake valve and exhaust valve to the closing direction application of force; Camshaft, it extends along the cylinder block column direction, and is arranged between above-mentioned each intake valve and each exhaust valve; A plurality of valve cams, its axis that has with this camshaft is the circular-arc basic circular portion at center and the valve actuation part of protruding more laterally than this basis circular portion, and is arranged on the above-mentioned camshaft respectively accordingly with above-mentioned each intake valve and each exhaust valve; A plurality of rocking arms, it is installed in respectively between each valve cam and above-mentioned each intake valve and each exhaust valve, and adjustable valve head gap is set between above-mentioned intake valve and exhaust valve; Because in above-mentioned a plurality of valve spring, with the valve spring of reaction force acts on above-mentioned camshaft is corresponding degree in crank angle and definite, corresponding therewith, above-mentioned camshaft changes with respect to the tilt angle of the cylinder center at the center that connects each cylinder, thereby in a part of valve in above-mentioned intake valve and exhaust valve, above-mentioned camshaft is with respect to the tilt angle of said cylinder center line, when adjusting the valve head gap and when opening valve, be in mutually different state, it is characterized in that, will with the profile of the valve actuation of the corresponding valve cam of above-mentioned a part of valve part, and with when adjusting the valve head gap and the valve actuation of the corresponding valve cam of valve that above-mentioned camshaft is identical with respect to the tilt angle of said cylinder center line when opening valve profile partly, set for different so that each intake valve each other or each exhaust valve valve lift each other identical.
In addition, for achieving the above object, the invention of being put down in writing in the claim 2 is a kind of valve gear of multicylinder engine, has: three groups of intake valves and exhaust valve, it is for each cylinder in three cylinders of arranged in series, and cylinder head is provided with one group and can carry out on-off action; Valve spring, its respectively to intake valve and exhaust valve to the closing direction application of force; Camshaft, it extends along the cylinder block column direction, and is arranged between above-mentioned each intake valve and each exhaust valve; A plurality of valve cams, its axis that has with this camshaft is the circular-arc basic circular portion at center and the valve actuation part of protruding more laterally than this basis circular portion, and is arranged on the above-mentioned camshaft respectively accordingly with above-mentioned each intake valve and each exhaust valve; A plurality of rocking arms, it is configured to: be installed in respectively between each valve cam and above-mentioned each intake valve and each exhaust valve, and between above-mentioned intake valve and exhaust valve, be provided with adjustable valve head gap, and arrange along the said cylinder orientation, and this to be configured in each cylinder be identical; Because in above-mentioned a plurality of valve spring, with the valve spring of reaction force acts on above-mentioned camshaft is corresponding degree in crank angle and definite, corresponding therewith, above-mentioned camshaft changes with respect to the tilt angle of the cylinder center at the center that connects each cylinder, thereby make, with above-mentioned each rocking arm in, along the corresponding a part of intake valve of rocking arm of one of the cylinder block column direction distolateral outermost end and exhaust valve and with above-mentioned each rocking arm in, in the corresponding another part intake valve of rocking arm and exhaust valve of another distolateral outermost end of cylinder block column direction, when adjusting the valve head gap, the true dip direction with respect to the said cylinder center line of above-mentioned camshaft is in same direction, and the tilt angle with respect to the said cylinder center line of above-mentioned camshaft, when adjusting the valve head gap and when opening valve, be in mutually different state, it is characterized in that, will with above-mentioned each rocking arm in, along the corresponding a part of intake valve of rocking arm of one of the cylinder block column direction distolateral outermost end and exhaust valve and with above-mentioned each rocking arm in, profile along the valve actuation part of the corresponding another part intake valve of rocking arm of another distolateral outermost end of cylinder block column direction and the corresponding valve cam of exhaust valve, form than with above-mentioned each intake valve and exhaust valve in, the profile of the valve actuation of the valve corresponding valve cam identical with respect to the tilt angle of said cylinder center line with above-mentioned camshaft when opening valve part is big when adjusting the valve head gap so that each intake valve each other or each exhaust valve lift each other identical.
Also have, the invention of being put down in writing in the claim 3, be in the formation of the invention that aforesaid right requirement 2 is put down in writing, also has such feature, the valve operating characteristic of above-mentioned each cylinder is to set like this: when the piston of a cylinder in above-mentioned three cylinders is in top dead center, intake valve in other two cylinders and any one in the exhaust valve are in the maximum lift state respectively.
Require 1 invention of being put down in writing according to aforesaid right, be in when camshaft is being adjusted the valve head gap with respect to the tilt angle of cylinder center and when opening valve in a part of valve of mutual different state, because it is all identical with the lift between each exhaust valve to be done so that the profile of the part of the valve actuation on the valve cam between each intake valve, so no matter how camshaft tilts with respect to cylinder center, can make each cylinder all obtain desired valve lift.Particularly, because the valve lift on each intake valve all is desired lift equally, so institute's amount of air drawn is identical in each cylinder, thereby can obtains desired output power, and can suppress the variation of the moment of torsion between each cylinder.
In addition, require 2 inventions of being put down in writing according to aforesaid right, because it is three that the cylinder of intake valve and exhaust valve is set, so on the direction that cylinder is arranged, the inclination amount of camshaft is minimum on the cylinder of central authorities, and the difference in the valve head gap when adjusting the valve head gap and when opening valve is little of negligible degree.On the other hand, two ends at the cylinder block column direction, because the difference between the tilt angle of camshaft is mutual is very big, with corresponding a part of intake valve of rocking arm and exhaust valve along one of the cylinder block column direction distolateral outermost end, and with above-mentioned each rocking arm in corresponding another part intake valve of the rocking arm along another distolateral outermost end of cylinder block column direction and exhaust valve, although the tilt angle of camshaft is in the very big state of mutual difference when adjusting the valve head gap and when opening valve, but, done the profile of the valve actuation on valve cam part greatly, made its lift just not have the lift of the intake valve of variation and exhaust valve identical with the tilt angle of above-mentioned camshaft.Therefore, no matter how camshaft changes with respect to the inclined degree of cylinder center, also can prevent the variation of valve lift at the tilt angle varied two ends big, that be arranged in the cylinder block column direction of camshaft effectively, can effectively adjust the position that lift has the greatest impact actually.
Further, require 3 inventions of being put down in writing according to aforesaid right, because the reaction force that acts on when setting the valve head gap on the camshaft is maximum, thereby the tilt angle of camshaft is also maximum, at this moment, under the state of valve actuation of valve cam partly not being adjusted, and compensate by difference to valve lift, determine the profile of valve actuation part, also can make the actual lift of valve reach the most approaching desired value.
Description of drawings
Fig. 1 is the plan view of the cylinder head under the state that has omitted rocking arm;
Fig. 2 is the sectional view along the 2-2 line among Fig. 1;
Fig. 3 is the sectional view along the 3-3 line among Fig. 1;
Fig. 4 is the figure of the valve characteristic of each cylinder of expression;
Fig. 5 is under the state in the valve head gap on corresponding with Fig. 1, as to adjust the two ends on the cylinder block column direction cylinder, represents the planimetric map of the heeling condition of camshaft turgidly;
Fig. 6 is corresponding with Fig. 1, under the state in the valve head gap on the cylinder of adjusting the central authorities on the cylinder block column direction, represents the planimetric map of the heeling condition of camshaft turgidly;
Fig. 7 is when adjusting the valve head gap and when opening valve, represents the sectional view of the displacement of camshaft turgidly.
Embodiment
Below, the one embodiment of the present of invention with reference to represented in the accompanying drawing illustrate embodiments of the present invention.
Fig. 1～Fig. 7 is one embodiment of the present of invention, and Fig. 1 is under the state that has omitted rocking arm, the planimetric map of cylinder head; Fig. 2 is the sectional view along the 2-2 line among Fig. 1; Fig. 3 is the sectional view along the 3-3 line among Fig. 1; Fig. 4 is the figure of the valve characteristic of each cylinder of expression; Fig. 5 is corresponding with Fig. 1, under the state in the valve head gap on the cylinder of adjusting the two ends on the cylinder block column direction, represents the planimetric map of the heeling condition of camshaft turgidly; Fig. 6 is corresponding with Fig. 1, under the state in the valve head gap on the cylinder of adjusting the central authorities on the cylinder block column direction, represents the planimetric map of the heeling condition of camshaft turgidly; Fig. 7 is when adjusting the valve head gap and when opening valve, represents the sectional view of the displacement of camshaft turgidly.
At first, in Fig. 1～Fig. 3, at many cylinders, for example, in the cylinder block 11 of the motor of three cylinders, be provided with can allow piston 12... be entrenched in respectively wherein to be free to slide, first～the 3rd cylinder C1 of arranged in series, C2, C3, and and cylinder block 11 links together and and cylinder block 11 between formed cylinder head 15 in the face of the firing chamber 14... at each piston 12... top.On this cylinder head 15, be respectively each cylinder C1～C3 and be provided with the suction port 16... and the relief opening 17... that can be communicated with each firing chamber 14..., and, also on each cylinder C1～C3, be provided with can open and close respectively each suction port 16... and relief opening 17..., altogether three form right intake valve 18... that can carry out on-off action and exhaust valve 19..., intake valve 18... and exhaust valve 19... are subjected to valve spring 20..., the 21... application of force to closing direction respectively.
And, the exhaust valve 19... of each cylinder C1～C3, all along the side (left side of Fig. 1) of cylinder block column direction 25 relatively the intake valve 18... of each cylinder relatively arrange with staggering.
In addition, on cylinder head 15,, each cylinder C1～C3 a pair of front end is arranged in spark plug 22... among the above-mentioned firing chamber 14..., 23..., and the nozzle 24 that is used for fuel is ejected into suction port 16... for respectively having installed.And, on cylinder head 15, orientation 25 along cylinder, on the side position adjacent of above-mentioned each intake valve 18..., promptly, on cylinder block column direction 25 position corresponding with exhaust valve 19..., installed and to have inserted and to have extracted the spark-plug socket 26... that above-mentioned spark plug 22... uses, and along said cylinder orientation 25, on the opposite side position adjacent of above-mentioned each exhaust valve 19..., that is, on cylinder block column direction 25 position corresponding, then connect to be provided with and to insert and to extract the jack 27... that above-mentioned spark plug 23... uses with intake valve 18....
On said cylinder lid 15, connect cylinder head cover 28, between cylinder head 15 and cylinder head cover 28, forming the valve cage 29 that can hold the valve gear 30 that is used for opening and closing and drive above-mentioned each intake valve 18... and above-mentioned each exhaust valve 19....
Valve gear 30 has: respectively arranging between a pair of three groups the intake valve 18... and exhaust valve 19... the camshaft 31 that extends along the cylinder block column direction on each cylinder C1～C3 totally; Be arranged on the camshaft 31, respectively with each intake valve 18... and corresponding a plurality of intake valves and exhaust valve cam 32..., the 33... of above-mentioned each exhaust valve 19...; Be installed in some air inlet sides and exhaust side rocking arm 34..., 35... between valve cam 32..., 33... and each intake valve 18... and the exhaust valve 19... respectively.
The two ends of camshaft 31 and with each cylinder between on the corresponding part, be provided with necked part 31a... that become one with camshaft, large diameter, corresponding with these necked parts 31a..., be provided with on the all-in-one-piece abutment wall 36... with cylinder head 15, be provided with chimeric respectively and support the bearing hole 37... of above-mentioned each necked part 31a..., camshaft 31 then is bearing on the above-mentioned abutment wall 36..., can freely rotate.
And, with the exhaust valve 19... of each cylinder C1～C3 in a side (left side of Fig. 1) along cylinder block column direction 25, intake valve 18... with respect to each cylinder is staggeredly arranged corresponding, inlet valve cam and exhaust valve cam 32..., 33... respectively with the corresponding part of each cylinder C1～C3 on exhaust valve cam 33..., be arranged on the camshaft 31 along cylinder block column direction 25 adjacent with the side of inlet valve cam 32....
; it is the basic circular portion 32a of the circular arc at center that inlet valve cam 32 is made the axis that has with camshaft 31; with valve actuation part 32b than the more outside protrusion of this basis circular portion 32a; in order to make the gettering quantity among each cylinder C1～C3 identical; and reduce the change of moment of torsion between cylinder C1～C3, the global shape of the inlet valve cam 32 of each cylinder C1～C3 is designed to substantially the same.On the other hand, exhaust valve cam 33 make the axis that has with camshaft 31 be the center circular arc basic circular portion 33a and than the valve actuation part 33b. of the more outside protrusion of this basis circular portion 33a
Top at above-mentioned each abutment wall 36..., fixed bearing the pitman arm shaft 38 with axis parallel with camshaft 31, above-mentioned air inlet side rocking arm and exhaust side rocking arm 34..., 35... make identical along being arranged among each cylinder C1～C3 of cylinder block column direction 25, are bearing on the pitman arm shaft 37 jointly and can shake.
Promptly, air inlet side rocking arm and exhaust side rocking arm 34..., 35... are bearing on the pitman arm shaft 38, the exhaust valve 19... of each cylinder C1～C3 is in the side along cylinder block column direction 25,18... is staggeredly arranged with respect to intake valve, exhaust valve cam 33... on the corresponding part of each cylinder C1～C3 respectively, along cylinder block column direction 25, positioned adjacent is in the side of inlet valve cam 32..., corresponding, exhaust side rocking arm 35... is along cylinder block column direction 25, and positioned adjacent is in the side of air inlet side rocking arm 34....
Rotate the roller (roller) 39 of contact on inlet valve cam 32 from exhaust valve 19 1 sides, with pivot suspension on an end of air inlet side rocking arm 34, the tappet screw 40 that can be crimped on intake valve 18 tops then is screwed on another end of air inlet side rocking arm 34, can freely advance and retreat.That is,, just can adjust the valve head gap between exhaust valve 19 and the exhaust side rocking arm 35 by adjusting the position advance and retreat of tappet screw 40.
In above-mentioned valve gear 30, the performance characteristic of the valve among cylinder C1～C3 is to set like this, that is, when the piston 12 in the cylinder in first～the 3rd cylinder C1～C3 reaches top dead center, all be in the maximum lift state in intake valve 18 in other two cylinders and the exhaust valve 19.For example, as shown in Figure 4, in the first cylinder C1, when intake valve 18 and exhaust valve 19 are in closed condition, promptly, when roller 39,41 all is in basic circular portion 32a, 33a state of contact with the valve cam 32,33 of air inlet side and exhaust side, when just piston 12 was in the state of top dead center, in the second cylinder C2, intake valve 18 was in the maximum lift state, in the 3rd cylinder C3, exhaust valve 19 is in the maximum lift state.In addition, in the second cylinder C2, when intake valve 18 and exhaust valve 19 are in closed condition, that is, when roller 39,41 all is in basic circular portion 32a, 33a state of contact with the valve cam 32,33 of air inlet side and exhaust side, when just piston 12 is in the state of top dead center, in the first cylinder C1, exhaust valve 19 is in the maximum lift state, and in the 3rd cylinder C3, intake valve 18 is in the maximum lift state.Further, in the 3rd cylinder C3, when intake valve 18 and exhaust valve 19 are in closed condition, that is, when roller 39,41 all is in basic circular portion 32a, 33a state of contact with the valve cam 32,33 of air inlet side and exhaust side, when just piston 12 is in the state of top dead center, in the first cylinder C1, intake valve 18 is in the maximum lift state, and in the second cylinder C2, exhaust valve 19 is in the maximum lift state.
Here, so-called maximum lift state, be exactly that the roller 39,41 of air inlet side and suction side rocking arm 34,35 is in valve actuation part 32b, 33b top state of contact on the valve cam 32,33 with air inlet side and suction side, the just state of the lift maximum of valve.
In this valve gear 30, adjust intake valve 18 and exhaust valve 19 and air inlet side and suction side rocking arm 34 among the first cylinder C1, valve head gap between 35, be that piston 12 in the first cylinder C1 is under the state of top dead center and carries out, in this process, valve spring 20 to intake valve 18 application of forces of the second cylinder C2, and to the valve spring 21 of exhaust valve 19 application of forces of the 3rd cylinder C3, just as the oblique line arrow 44 among Fig. 5, shown in 44, very big reaction force acts is all arranged on camshaft 31, in the scope of the micro-gap that camshaft 31 will be produced between abutment wall 36... and camshaft 31, in the first cylinder C1 to lopsidedness near intake valve 18.
In addition, adjust intake valve 18 and exhaust valve 19 and air inlet side and suction side rocking arm 34 among the 3rd cylinder C3, valve head gap between 35, be that piston 12 in the 3rd cylinder C3 is under the state of top dead center and carries out, in this process, valve spring 20 to intake valve 18 application of forces of the first cylinder C1, and to the valve spring 21 of exhaust valve 19 application of forces of the second cylinder C2, just as the oblique line arrow 45 among Fig. 5, shown in 45, very big reaction force acts is all arranged on camshaft 31, in the scope of the micro-gap that camshaft 31 will be produced between abutment wall 36... and camshaft 31, to lopsidedness near the intake valve 18 among the first cylinder C1.
That is, during valve head gap in adjusting the first and the 3rd cylinder C1, C3, that is, the piston 12 in the first and the 3rd cylinder C1, C3 all is under the state of top dead center, and the true dip direction of camshaft 31 is identical.
In contrast, adjust intake valve 18 and exhaust valve 19 and air inlet side and suction side rocking arm 34 among the second cylinder C2, valve head gap between 35, be that piston 12 in the second cylinder C2 is under the state of top dead center and carries out, valve spring 21 to exhaust valve 19 application of forces of the first cylinder C1, and to the valve spring 20 of intake valve 18 application of forces of the 3rd cylinder C3, just as the hollow arrow among Fig. 6 46, shown in 46, very big reaction force acts is all arranged on camshaft 31, in the scope of the micro-gap that camshaft 31 will be produced between abutment wall 36... and camshaft 31, to lopsidedness near the exhaust valve 19 among the first cylinder C1.
Promptly, during valve head gap in adjusting the first and the 3rd cylinder C1, C3, during with the valve head gap adjusted among the second cylinder C2, the true dip direction of camshaft 31 is opposite mutually, and the axis of camshaft 31 is different with respect to the angle of inclination of the cylinder center CL at the center that connects each cylinder C1～C3.
On the other hand, under the state that exhaust valve 19 in the first cylinder C1 is opened by valve cam 33 drivings of exhaust side, and the 3rd intake valve 18 among the cylinder C3 drive by the valve cam 32 of air inlet side and under the state opened, the valve spring 21 of the first cylinder C1 and the valve spring 20 of the 3rd cylinder C3 will produce as the arrow among Fig. 6 46, such reaction force shown in 46, at this moment, camshaft 31 just is in heeling condition such shown in Fig. 6, and the angle of inclination with respect to cylinder center CL of camshaft 31, with adjustment the first and the 3rd cylinder C1, difference during valve head gap among the C3.
In addition, under the state that intake valve 18 in the first cylinder C1 is opened by valve cam 32 drivings of air inlet side, and second exhaust valve 19 among the cylinder C2 drive by the valve cam 33 of exhaust side and under the state opened, the valve spring 20 of the first cylinder C1 and the valve spring 21 of the 3rd cylinder C3 will produce as the hollow arrow among Fig. 5 45, such reaction force shown in 45, camshaft 31 just is in heeling condition such shown in Fig. 5, and the angle of inclination with respect to cylinder center CL of camshaft 31, with adjustment the first and the 3rd cylinder C1, identical during valve head gap among the C3.
In addition, under the state that intake valve 18 in the second cylinder C2 is opened by valve cam 32 drivings of air inlet side, and the 3rd exhaust valve 19 among the cylinder C3 drive by the valve cam 33 of exhaust side and when opening, at this moment, the valve spring 20 of the second cylinder C2 and the valve spring 21 of the 3rd cylinder C3 will produce as the oblique line arrow 44 among Fig. 5, such reaction force shown in 44, at this moment, camshaft 31 just is in heeling condition such shown in Fig. 5, and the angle of inclination with respect to cylinder center CL of camshaft 31, with adjust the second cylinder C2 in the valve head gap time different.
Also have, under the state that exhaust valve 19 in the second cylinder C2 is opened by valve cam 33 drivings of exhaust side, and first intake valve 18 among the cylinder C1 drive by the valve cam 32 of air inlet side and when opening, at this moment, the valve spring 21 of the second cylinder C2 and the valve spring 20 of the first cylinder C1 will produce as the arrow among Fig. 5 45, such reaction force shown in 45, at this moment, camshaft 31 just is in heeling condition such shown in Fig. 5, and the angle of inclination with respect to cylinder center CL of camshaft 31, with adjust the second cylinder C2 in the valve head gap time different.
Like this, on being arranged on each cylinder C1～C3 each to valve spring 20..., 21... in, with the valve spring 20,21 of reaction force acts on camshaft 31, be corresponding crank angle and definite, corresponding therewith, camshaft 31 changes with respect to the tilt angle of cylinder center CL.If be arranged in along the corresponding exhaust valve 19 of the exhaust side rocking arm 35 of one of cylinder arrangement direction 25 distolateral outermost end, with be arranged on the corresponding intake valve 18 of the air inlet side rocking arm 34 of one of cylinder arrangement direction 25 distolateral outermost end, camshaft 31 when making adjustment valve head gap is in same direction (direction shown in Fig. 5) with respect to the true dip direction of cylinder center CL, the tilt angle with respect to cylinder center CL of camshaft 31 then is in mutual different state when adjusting the valve head gap and when opening valve.
That is, at the exhaust valve 19 of the first cylinder C1, and in the intake valve 18 of the 3rd cylinder C3, camshaft 31 as described above is with respect to the tilt angle of cylinder center CL, when adjusting the valve head gap and when opening valve, is in different state mutually.
Like this, because the tilt angle with respect to cylinder center CL of camshaft 31, different mutually when opening valve when adjusting the valve head gap, for example, in the intake valve 18 of the 3rd cylinder C3, when adjusting the valve head gap, the valve cam 32 of the air inlet side of camshaft 31 on the position shown in Fig. 7 (a), on the contrary, when valve is opened, the valve cam 32 of the air inlet side of camshaft 31 just shown in Fig. 7 (b), from the position shown in the imaginary line to the displacement shown in the solid line.Like this, when adjusting the valve head gap, even determined the valve head gap d, to actual when opening valve, because the rocking arm 34 of air inlet side contacts with the valve cam 32 of the air inlet side of Fig. 7 (a), the valve head gap just becomes bigger than above-mentioned d, and the lift of intake valve 18 has departed from the value when adjusting the valve head gap.
Therefore, with corresponding a part of intake valve of rocking arm and exhaust valve along the distolateral outermost end of cylinder block column direction 25 1, promptly, exhaust side rocking arm 35 corresponding exhaust valves 19 with the first cylinder C1, and with along corresponding another part intake valve of the rocking arm of cylinder block column direction 25 another distolateral outermost end and exhaust valve, promptly, air inlet side rocking arm 34 corresponding intake valve 18 corresponding exhaust sides and air inlet side valve cams 33 with the 3rd cylinder C3,32 valve actuation part 33b, the profile of 32b, the indeclinable valve in angle of inclination with camshaft 31 when adjusting the valve head gap and during valve work, promptly, respectively with the intake valve 18 of the first cylinder C1 and exhaust valve 19 corresponding air inlet side and the exhaust side valve cams 32 of the 3rd cylinder C3,33 valve actuation part 32b, the profile of 33b, that sets is inequality mutually, so that the valve lift of all intake valves 18 and all exhaust valve 19 is identical.In three such cylinder engines of present embodiment, profile with the valve actuation part 33b of the exhaust valve side rocking arm 35 corresponding exhaust side valve cams 33 of the first cylinder C1, do greatlyyer a little than the profile of the valve actuation part 33b of the exhaust side valve cam 33 on the 3rd cylinder C3, and with the profile of the valve actuation part 32b of the air inlet side rocking arm 34 corresponding air inlet side valve cams 32 of the 3rd cylinder C3, do greatlyyer a little than the profile of the valve actuation part 32b of the air inlet side valve cam 32 on the first cylinder C1.
On the other hand, in the second cylinder C2, no matter be intake valve 18 or exhaust valve 19, when adjusting the valve head gap, camshaft 31 is just with respect to cylinder center CL generation inclination as shown in Figure 6, in addition, when opening valve, camshaft 31 is just with respect to cylinder center CL generation inclination as shown in Figure 5.Though the angle of inclination with respect to cylinder center CL of camshaft 31, be in mutual different state when adjusting the valve head gap and when opening valve, valve lift when opening valve will change to the big direction of lift, but, because the second cylinder C2 is in along the central authorities of cylinder block column direction 25, the position of intake valve 18 and exhaust valve 19 is the center of the close second cylinder C2 all, even so there are some deviations in the valve head gap of intake valve 18 and exhaust valve 19 when adjusting, this deviation also is small enough to negligible degree, for the second cylinder C2, even can take into account that the lift of valve 18 and exhaust valve 19 does not change in fact.
But, when critically being set at the valve lift of intake valve 18 among each cylinder C1～C3 and exhaust valve 19 identical, when accurate more control is carried out in air inlet and exhaust, can be the profile of the valve actuation part 32b of the air inlet side valve cam 32 on the second cylinder C2, and the profile of the valve actuation part 33b of exhaust side valve cam 33, do smallerly a little than the profile of the valve actuation part 33b of the profile of the valve actuation part 32b of the air inlet side valve cam 32 on the first cylinder C1 and the exhaust side valve cam 33 on the 3rd cylinder C3.
Below, the effect of present embodiment is described.With along the i.e. exhaust side rocking arm 35 corresponding exhaust valves 19 of the first cylinder C1 of the rocking arm of one of cylinder block column direction 25 distolateral outermost end, and with along the i.e. air inlet side rocking arm 34 corresponding intake valves 18 of the 3rd cylinder C3 of the rocking arm of another distolateral outermost end of cylinder block column direction 25, their pairing exhaust sides and air inlet side valve cam 33,32 valve actuation part 33b, the profile of 32b, form respectively when adjusting the valve head gap and during valve work, the indeclinable valve in the tilt angle of camshaft 31 is the exhaust valve 19 of the 3rd cylinder C3 and intake valve 18 corresponding exhaust sides and the air inlet side valve cam 33 of the first cylinder C1,32 valve actuation part 33b, the profile of 32b is big, so that the lift of all intake valves 18 and all exhaust valve 19 is all identical.
That is, in the motor of three cylinders, the inclination amount of camshaft 31 is very little in the cylinder of the central authorities on cylinder block column direction 25, and the difference in the valve head gap when adjusting the valve head gap and when opening valve is little of negligible degree.On the other hand, because it is very big in the angle of inclination of the camshaft 31 on the two ends of cylinder block column direction 25 difference each other, so exhaust side rocking arm 35 corresponding exhaust valves 19 with the first cylinder C1, with with the air inlet side rocking arm 34 corresponding intake valves 18 of the 3rd cylinder C3, although when adjusting the valve head gap and when opening valve, the angle of inclination of camshaft 31 is under the state that very big difference is arranged mutually, but intake valve 18 with the very little second cylinder C2 of the variation in valve head gap, exhaust valve 19 has same lift, so forms valve cam 32, valve actuation part 32b on 33, the profile of 33b.
Therefore, no matter how camshaft 31 tilts with respect to cylinder center CL, can both prevent effectively that the angle change of camshaft 31 is big, the valve lift at the two ends of cylinder block column direction 25 changes, and can measure maximum position and effectively adjusts in fact influencing the valve scapegoat.
Particularly, because all the valve of intake valve proposes an amount and can both obtain desired same lift, air imbibed quantity among each cylinder C1～C3 is all identical, so when obtaining desirable output power, can also suppress the variation of moment of torsion between each cylinder C1～C3.
And, the valve operating characteristic of valve gear 30, because when the piston 12 of a cylinder is in top dead center in three cylinders, intake valve 18 in other two cylinders and any one in the exhaust valve 19 are set at the maximum lift state respectively, so when setting the valve head gap, the reaction force that acts on the camshaft 31 is just maximum, thereby the angle of inclination of camshaft 31 is also maximum, at this moment, needn't adjust valve cam 32,33 valve actuation part 32b, 33b, equally also can compensate the difference of valve lift, can be by means of definite valve actuation part 32b, the profile of 33b makes actual valve lift farthest near desired value.
In the above-described embodiments, about cylinder along the central authorities of cylinder block column direction 25, the i.e. second cylinder C2, although camshaft 31 is different when adjusting the valve head gap and when opening valve with respect to the tilt angle of cylinder center CL, but can change the valve cam 32 of air inlet side and exhaust side, valve actuation part 32b on 33, the profile of 33b, but, also can make valve actuation part 32b, the profile of 33b is with the tilt angle of the camshaft 31 corresponding valve cam 32 of indeclinable valve when adjusting the valve head gap and when opening valve, valve actuation part 32b on 33, the profile difference of 33b.
One embodiment of the present of invention more than have been described, but the present invention is not limited only to the foregoing description, it can carry out various changes to its design in the scope of the present invention that the claim that originally exceeds the application is put down in writing.
Claims (3)
1. the valve gear of a multicylinder engine has: intake valve (18) and exhaust valve (19), and they are for each cylinder in a plurality of cylinders (C1, C2, C3) of arranged in series, are arranged on cylinder head (15) and go up and can carry out on-off action; Valve spring (20,21), its respectively to intake valve (18) and exhaust valve (19) to the closing direction application of force; Camshaft (31), it extends along cylinder block column direction (25), and is arranged between above-mentioned each intake valve (18) and each exhaust valve (19); A plurality of valve cams (32,33), it has with the axis of this camshaft (31) is the circular-arc basic circular portion (32a, 33a) at center and the valve actuation part of protruding more laterally than this basis circular portion (32a, 33a) (32b, 33b), and is arranged on accordingly respectively on the above-mentioned camshaft (31) with above-mentioned each intake valve (18) and each exhaust valve (19); A plurality of rocking arms (34,35), it is installed in respectively between each valve cam (32,33) and above-mentioned each intake valve (18) and each exhaust valve (19), and between above-mentioned intake valve (18) and exhaust valve (19) adjustable valve head gap is set; Because in above-mentioned a plurality of valve spring (20,21) in, with the valve spring of reaction force acts on above-mentioned camshaft (31) is corresponding degree in crank angle and definite, corresponding therewith, (tilt angle of the cylinder center (CL) at the center of C1～C3) changes above-mentioned camshaft (31) with respect to connecting each cylinder, thereby in a part of valve in above-mentioned intake valve (18) and exhaust valve (19), above-mentioned camshaft (31) is with respect to the tilt angle of said cylinder center line (CL), when adjusting the valve head gap and when opening valve, be in mutually different state, it is characterized in that
Will with the profile of the valve actuation of the corresponding valve cam of above-mentioned a part of valve (32,33) part (32b, 33b), and with when adjusting the valve head gap and the valve actuation of the corresponding valve cam of valve (32,33) that above-mentioned camshaft (31) is identical with respect to the tilt angle of said cylinder center line (CL) when the opening valve profile of (32b, 33b) partly, set for different so that each intake valve (18) each other or each exhaust valve (19) valve lift each other identical.
2. the valve gear of a multicylinder engine has: three groups of intake valves (18) and exhaust valve (19), each cylinder in its three cylinders for arranged in series (C1, C2, C3), cylinder head (15) are provided with one group and can carry out on-off action; Valve spring (20,21), its respectively to intake valve (18) and exhaust valve (19) to the closing direction application of force; Camshaft (31), it extends along cylinder block column direction (25), and is arranged between above-mentioned each intake valve (18) and each exhaust valve (19); A plurality of valve cams (32,33), it has with the axis of this camshaft (31) is the circular-arc basic circular portion (32a, 33a) at center and the valve actuation part of protruding more laterally than this basis circular portion (32a, 33a) (32b, 33b), and is arranged on accordingly respectively on the above-mentioned camshaft (31) with above-mentioned each intake valve (18) and each exhaust valve (19); A plurality of rocking arms (34,35), it is configured to: be installed in respectively between each valve cam (32,33) and above-mentioned each intake valve (18) and each exhaust valve (19), and between above-mentioned intake valve (18) and exhaust valve (19), be provided with adjustable valve head gap, and arrange along said cylinder orientation (25), and this is configured in each cylinder, and (among the C1～C3) is identical; Because in above-mentioned a plurality of valve spring (20,21) in, with the valve spring of reaction force acts on above-mentioned camshaft (31) is corresponding degree in crank angle and definite, corresponding therewith, (tilt angle of the cylinder center (CL) at the center of C1～C3) changes above-mentioned camshaft (31) with respect to connecting each cylinder, thereby make, with above-mentioned each rocking arm (34,35), along the corresponding a part of intake valve of rocking arm of one of cylinder block column direction (25) distolateral outermost end and exhaust valve and with above-mentioned each rocking arm (34,35), in the corresponding another part intake valve of rocking arm and exhaust valve of another distolateral outermost end of cylinder block column direction (25), when adjusting the valve head gap, the true dip direction with respect to said cylinder center line (CL) of above-mentioned camshaft (31) is in same direction, and the tilt angle with respect to said cylinder center line (CL) of above-mentioned camshaft (31), when adjusting the valve head gap and when opening valve, be in mutually different state, it is characterized in that
Will with above-mentioned each rocking arm (34,35), along the corresponding a part of intake valve of rocking arm (18) of one of cylinder block column direction (25) distolateral outermost end and exhaust valve (19) and with above-mentioned each rocking arm (34,35), profile along the valve actuation part of the corresponding another part intake valve of rocking arm (18) of another distolateral outermost end of cylinder block column direction (25) and the corresponding valve cam of exhaust valve (19), form than with above-mentioned each intake valve (18) and exhaust valve (19) in, the valve corresponding valve cam (32 identical with respect to the tilt angle of said cylinder center line (CL) when adjusting the valve head gap with above-mentioned camshaft (31) when opening valve, 33) valve actuation part (32b, profile 33b) is big so that each intake valve (18) each other or each exhaust valve (19) lift each other identical.
3. the valve gear of multicylinder engine as claimed in claim 2 is characterized in that,
(valve operating characteristic of C1～C3) is to set like this: (piston (12) of a cylinder among the C1～C3) is when being in top dead center when above-mentioned three cylinders for above-mentioned each cylinder, intake valve (18) in other two cylinders and any one in the exhaust valve (19) are in the maximum lift state respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003311718A JP2005076606A (en) | 2003-09-03 | 2003-09-03 | Valve system for multi-cylinder engine |
| JP2003311718 | 2003-09-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1590715A true CN1590715A (en) | 2005-03-09 |
| CN100379950C CN100379950C (en) | 2008-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100742351A Expired - Fee Related CN100379950C (en) | 2003-09-03 | 2004-09-03 | Air valve device for multi-cylinder engine |
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| Country | Link |
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| JP (1) | JP2005076606A (en) |
| CN (1) | CN100379950C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107489542A (en) * | 2016-06-09 | 2017-12-19 | 福特环球技术公司 | Valve deactivation system for engine |
| CN108240243A (en) * | 2016-12-26 | 2018-07-03 | 丰田自动车株式会社 | For the variable valve actuator for air of engine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7288303B2 (en) * | 2019-01-22 | 2023-06-07 | 株式会社Subaru | engine cylinder head structure |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3265712B2 (en) * | 1992-05-25 | 2002-03-18 | 松下電器産業株式会社 | High breakdown voltage semiconductor device and method of manufacturing the same |
| JPH07127403A (en) * | 1993-11-05 | 1995-05-16 | Toyota Motor Corp | Valve system for internal combustion engine |
| CN2448928Y (en) * | 1998-09-25 | 2001-09-19 | 吴江 | Mechanism capable changing valve timing phase and valve lift |
| JP2002155779A (en) * | 2000-11-17 | 2002-05-31 | Toyota Motor Corp | Multi-cylinder internal combustion engine equipped with variable valve system |
| JP4134587B2 (en) * | 2001-04-16 | 2008-08-20 | スズキ株式会社 | Valve operating device and internal combustion engine provided with the same |
-
2003
- 2003-09-03 JP JP2003311718A patent/JP2005076606A/en active Pending
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2004
- 2004-09-03 CN CNB2004100742351A patent/CN100379950C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107489542A (en) * | 2016-06-09 | 2017-12-19 | 福特环球技术公司 | Valve deactivation system for engine |
| CN108240243A (en) * | 2016-12-26 | 2018-07-03 | 丰田自动车株式会社 | For the variable valve actuator for air of engine |
| CN108240243B (en) * | 2016-12-26 | 2020-03-20 | 丰田自动车株式会社 | Variable valve mechanism for engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100379950C (en) | 2008-04-09 |
| JP2005076606A (en) | 2005-03-24 |
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