CN103967550A - Distribution cam mechanism of gasoline engine - Google Patents
Distribution cam mechanism of gasoline engine Download PDFInfo
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- CN103967550A CN103967550A CN201410175580.8A CN201410175580A CN103967550A CN 103967550 A CN103967550 A CN 103967550A CN 201410175580 A CN201410175580 A CN 201410175580A CN 103967550 A CN103967550 A CN 103967550A
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Abstract
The invention discloses a distribution cam mechanism of a gasoline engine, and belongs to the field of gasoline engine distribution parts. An inlet cam of the mechanism comprises an inlet working section, an inlet starting buffer section, an inlet stopping buffer section and a first base circle. The two ends of the inlet working section are respectively connected with the first base circle through the inlet starting buffer section and the inlet stopping buffer section. An exhaust cam comprises an exhaust working section, an exhaust starting buffer section, an exhaust stopping buffer section and a second base circle. The two ends of the exhaust working section are respectively connected with the second base circle through the exhaust starting buffer section and the exhaust stopping buffer section. According to the distribution cam mechanism, by limiting profile parameters, such as the maximum lifts of the inlet cam and the exhaust cam and the radiuses of the first base circle and the second base circle, of the inlet cam and the exhaust cam, the inlet cam and the exhaust cam which are high in abundance ratio can be acquired, and therefore stress uniformity, rotation stability and the service life of the inlet cam and the exhaust cam in the rotation process are guaranteed.
Description
Technical field
The present invention relates to petrol engine distribution field of components, particularly a kind of distribution cam mechanism of petrol engine.
Background technique
Distribution cam mechanism is constituent elements important in petrol engine, distribution cam mechanism comprises intake cam, exhaust cam, air inlet plane tappet, exhaust plane tappet, intake valve and exhaust valve, intake valve covers on the suction port of petrol engine, one end of air inlet plane tappet is connected with intake valve, the other end of air inlet plane tappet contacts with intake cam, exhaust valve covers on the relief opening of petrol engine, one end of exhaust plane tappet is connected with exhaust valve, and the other end of exhaust plane tappet contacts with exhaust cam.
In prior art, distribution cam mechanism is in operation process, and intake cam rotates and promotes air inlet plane tappet and drives intake valve folding, and exhaust cam rotates and promotes exhaust plane tappet and drives exhaust valve folding.Wherein the noise level tool of reliability, durability and the petrol engine entirety of the molded line of intake cam and exhaust cam to petrol engine has a great impact, for improving petrol engine distribution performance requirement, can improve the lift of intake cam and exhaust cam under normal circumstances as far as possible.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem:
Prior art is in the time improving the lift of intake cam and exhaust cam; conventionally can be to intake cam and exhaust cam the stressed uniformity in rotation process and intake cam and the exhaust cam stationarity of rotating cause harmful effect, have a strong impact on the working life of intake cam and exhaust cam.
Summary of the invention
In order to solve discontinuity and the poor problem of stationarity in prior art distribution cam mechanism rotation process, the embodiment of the present invention provides a kind of distribution cam mechanism of petrol engine.Described technological scheme is as follows:
A distribution cam mechanism for petrol engine, the distribution cam mechanism of described petrol engine comprises intake cam, exhaust cam, air inlet plane tappet, exhaust plane tappet, intake valve and exhaust valve,
The molded line of described intake cam comprises that breeze way is opened in air inlet active section, air inlet, breeze way and the first basic circle are closed in air inlet, one end of described air inlet active section is opened breeze way by described air inlet and is connected with described the first basic circle, and the other end of described air inlet active section is closed breeze way by described air inlet and is connected with described the first basic circle;
The two ends that breeze way is opened in described air inlet are 20 ° with the angle that the line in the described first basic circle center of circle forms respectively, the two ends that breeze way is closed in described air inlet are 22 ° with the angle that the line in the described first basic circle center of circle forms respectively, and the maximum lift of described intake cam is 7.3mm;
The molded line of described exhaust cam comprises exhaust work section, exhaust unlatching breeze way, exc. breeze way and the second basic circle, one end of described exhaust work section is opened breeze way by described exhaust and is connected with described the second basic circle, and the other end of described exhaust work section is connected with described the second basic circle by described exc. breeze way;
The angle that the two ends that breeze way is opened in described exhaust form with the line in the described second basic circle center of circle respectively, the two ends of described exc. breeze way are 20 ° with the angle that the line in the described second basic circle center of circle forms respectively, the maximum lift of described exhaust cam is 7.3mm
Described the first basic circle and described the second Base radius are 16.5mm.
Further, the molded line cornerite of described intake cam is 192.7degCRA.
Further, the molded line cornerite of described exhaust cam is 201.4degCRA.
Further, the contact width of described intake cam and the contact width of described air inlet plane tappet, described exhaust cam and described exhaust plane tappet is 9mm.
Further, the lift of described air inlet unlatching breeze way is 0～0.18mm.
Further, to close the lift of breeze way be 0～0.2mm in described air inlet.
Further, the lift of breeze way is opened in described exhaust, the lift of described exc. breeze way is 0～0.22mm.
Further, the air inlet active section lift of described intake cam adopts multinomial dynamic equation formula to characterize, and described multinomial dynamic equation formula is:
h＝(h
max-h
r)(1+c
2x
2+c
4x
4+c
px
p+c
qx
q+c
rx
r+c
sx
s)，
Wherein,
H is the described air inlet active section lift of described intake cam;
H
maxfor the maximum lift of described intake cam;
In described IO Intake Valve Opens process, h
rfor the lift of described air inlet unlatching breeze way, in described IC Intake Valve Closes process, h
rfor the lift of breeze way is closed in described air inlet;
In described IO Intake Valve Opens process, the angle that x forms to the line in the described first basic circle center of circle to the point of contact of the line in the described first basic circle center of circle, described air inlet active section and air inlet plane tappet for the intersection point of described air inlet active section and described air inlet unlatching breeze way, in the process of described IC Intake Valve Closes, x closes the angle that the intersection point of breeze way forms to the line in the described first basic circle center of circle to the point of contact of the line in the described first basic circle center of circle, described air inlet active section and air inlet plane tappet for described air inlet active section and air inlet;
P, q, r, s is index, and p=8, q=12, r=20, s=26;
C
4for parameter, and c
4=0.18.
Further, the exhaust work section lift of described exhaust cam adopts multinomial dynamic equation formula to characterize, and described multinomial dynamic equation formula is:
h＝(h
max-h
r)(1+c
2x
2+c
4x
4+c
px
p+c
qx
q+c
rx
r+c
sx
s)，
Wherein,
H is the described exhaust work section lift of described exhaust cam;
H
maxfor the maximum lift of described exhaust cam;
In described exhauxt valve opens process, h
rfor the lift of described exhaust unlatching breeze way, in described exhaust valve closing process, h
rfor the lift of described exc. breeze way;
In described exhauxt valve opens process, the angle that x forms to the line in the described second basic circle center of circle to the point of contact of the line in the described second basic circle center of circle, described exhaust work section and exhaust plane tappet for the intersection point of described exhaust work section and described exhaust unlatching breeze way, in the process of described exhaust valve closing, the angle that the intersection point that x is described exhaust work section and exc. breeze way forms to the line in the described second basic circle center of circle to the point of contact of the line in the described second basic circle center of circle, described exhaust work section and exhaust plane tappet;
P, q, r, s is index, and p=6, q=18, r=26, s=34;
C
4for parameter, and c
4=0.2～0.26.
The beneficial effect that the technological scheme that the embodiment of the present invention provides is brought is:
The present invention is by limiting the maximum lift of intake cam and exhaust cam, the molded line parameter of the intake cams such as the first basic circle and the second base radius of a circle and exhaust cam, can obtain intake cam and exhaust cam that Richness is higher, intake cam and exhaust cam rational driving intake valve and exhaust valve motion are ensured, directly ensure uniformity stressed in intake cam and exhaust cam rotation process, open the two ends of breeze way and the angle forming with the line in the first basic circle center of circle respectively by limiting air inlet simultaneously, the angle that the two ends that breeze way is closed in air inlet form with the line in the first basic circle center of circle respectively, the angle that the two ends that breeze way is opened in exhaust form with the line in the second basic circle center of circle respectively, the angle that the two ends of exc. breeze way form with the line in the second basic circle center of circle respectively, can make the first basic circle and air inlet active section on intake cam, transition stably between the second basic circle and exhaust work section on exhaust cam, thereby ensure the stationarity that intake cam and exhaust cam rotate, ensure the working life of intake cam and exhaust cam.
Brief description of the drawings
In order to be illustrated more clearly in the technological scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the distribution cam mechanism that provides of the embodiment of the present invention;
Fig. 2 is the intake cam structural representation that further embodiment of this invention provides;
Fig. 3 is the intake cam lifting curve figure that further embodiment of this invention provides;
Fig. 4 is the intake cam speed curve diagram that further embodiment of this invention provides;
Fig. 5 is the intake cam acceleration plots that further embodiment of this invention provides;
Fig. 6 is the exhaust cam structural representation that further embodiment of this invention provides;
Fig. 7 is the exhaust cam lifting curve figure that further embodiment of this invention provides;
Fig. 8 is the exhaust cam speed curve diagram that further embodiment of this invention provides;
Fig. 9 is the exhaust cam acceleration plots that further embodiment of this invention provides;
Wherein,
1 intake cam,
11 air inlet active sections,
Breeze way is opened in 12 air inlets,
Breeze way is closed in 13 air inlets,
14 first basic circles,
2 air inlet plane tappets,
3 intake valves,
4 exhaust cams,
41 exhaust work sections,
Breeze way is opened in 42 exhausts,
43 exc. breeze ways,
44 second basic circles,
5 exhaust plane tappets,
6 exhaust valves.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment one
As shown in Figure 1, the embodiment of the present invention provides a kind of distribution cam mechanism of petrol engine, and the distribution cam mechanism of petrol engine comprises intake cam 1, exhaust cam 4, air inlet plane tappet 2, exhaust plane tappet 5, intake valve 3 and exhaust valve 6,
The molded line of intake cam 1 comprises that breeze way 12 is opened in air inlet active section 11, air inlet, breeze way 13 and the first basic circle 14 are closed in air inlet, one end of air inlet active section 11 is opened breeze way 12 by air inlet and is connected with the first basic circle 14, the other end of air inlet active section 11 is closed breeze way 13 by air inlet and is connected with the first basic circle 14
The two ends that breeze way 12 is opened in air inlet are 20 ° with the angle that the line in first basic circle 14 centers of circle forms respectively, line is made with first basic circle 14 centers of circle respectively in the two ends that are air inlet unlatching breeze way 12, article two, the angle between line is 20 °, the two ends that breeze way 13 is closed in air inlet are 22 ° with the angle that the line in first basic circle 14 centers of circle forms respectively, be that line is made with first basic circle 14 centers of circle respectively in the two ends that breeze way 13 is closed in air inlet, article two, the angle between line is 22 °, the maximum lift of intake cam 1 is 7.3mm
Exhaust cam 4 comprises exhaust work section 41, exhaust unlatching breeze way 42, exc. breeze way 43 and the second basic circle 44, one end of exhaust work section 41 is opened breeze way 12 by air inlet and is connected with the second basic circle 44, the other end of exhaust work section 41 is connected with the second basic circle 44 by exc. breeze way 43
The angle that the two ends that breeze way 42 is opened in exhaust form with the line in second basic circle 44 centers of circle respectively, the two ends of exc. breeze way 43 are 20 ° with the angle that the line in second basic circle 44 centers of circle forms respectively, line is made with second basic circle 44 centers of circle respectively in the two ends that are exhaust unlatching breeze way 42, article two, the angle between line, and line is made with second basic circle 44 centers of circle respectively in the two ends of exc. breeze way 43, article two, the angle between line is 20 °, the maximum lift of exhaust cam 4 is 7.3mm
The radius of the first basic circle 14 and the second basic circle 44 is 16.5mm.
It should be noted that: be 7.3mm by the maximum lift that limits intake cam 1, exhaust cam 4, and the radius that limits the first basic circle 14 and the second basic circle 44 is 16.5mm, so can ensure that intake cam 1 and the shape of exhaust cam 4 all can be too not elongated, make intake cam 1 comparatively mellow and full with the shape of exhaust cam 4, Richness is better.
The present invention is by limiting the maximum lift of intake cam 1 and exhaust cam 4, the molded line parameter of the intake cams such as the radius of the first basic circle 14 and the second basic circle 44 1 and exhaust cam 4, can obtain intake cam 1 and exhaust cam 4 that Richness is higher, ensure that intake cam 1 and exhaust cam 4 rational driving intake valves 3 move with exhaust valve 6, directly ensure uniformity stressed in intake cam 1 and exhaust cam 4 rotation processes, open the two ends of breeze way 12 and the angle forming with the line in first basic circle 14 centers of circle respectively by limiting air inlet simultaneously, the angle that the two ends that breeze way 13 is closed in air inlet form with the line in first basic circle 14 centers of circle respectively, the angle that the two ends that breeze way 42 is opened in exhaust form with the line in second basic circle 44 centers of circle respectively, the angle that the two ends of exc. breeze way 43 form with the line in second basic circle 44 centers of circle respectively, can make the first basic circle 14 and air inlet active section 11 on intake cam 1, transition stably between the second basic circle 44 and exhaust work section 41 on exhaust cam 4, thereby ensure the stationarity that intake cam 1 and exhaust cam 4 rotate, ensure the working life of intake cam 1 and exhaust cam 4.
Embodiment two
As shown in Figure 1, the embodiment of the present invention provides a kind of distribution cam mechanism of petrol engine, and the distribution cam mechanism of petrol engine comprises intake cam 1, exhaust cam 4, air inlet plane tappet 2, exhaust plane tappet 5, intake valve 3 and exhaust valve 6,
Intake cam 1 comprises that breeze way 12 is opened in air inlet active section 11, air inlet, breeze way 13 and the first basic circle 14 are closed in air inlet, one end of air inlet active section 11 is opened breeze way 12 by air inlet and is connected with the first basic circle 14, and the other end of air inlet active section 11 is closed breeze way 13 by air inlet and is connected with the first basic circle 14;
Exhaust cam 4 comprises exhaust work section 41, exhaust unlatching breeze way 42, exc. breeze way 43 and the second basic circle 44, one end of exhaust work section 41 is opened breeze way 12 by air inlet and is connected with the second basic circle 44, and the other end of exhaust work section 41 is connected with the second basic circle 44 by exc. breeze way 43;
The first basic circle 14 equates with the radius of the second basic circle 44.
Further, as shown in Figure 2-5, the embodiment of the present invention provides a kind of distribution cam mechanism of petrol engine, and wherein the maximum lift of intake cam 1 is 7.3mm, is designated as h
max=7.3mm, wherein, by air inlet active section 11 distance first basic circle 14 centers of circle point and the first basic circle 14 circle center line connectings farthest, obtain the intersection point of line and the first basic circle 14, will on this intersection point and air inlet active section 11, obtain the maximum lift of intake cam 1 apart from the first basic circle 14 point line farthest; Be 7.3mm by the maximum lift that limits intake cam 1, can effectively improve the distribution performance of intake cam 1.
The two ends that breeze way 12 is opened in air inlet are 20 ° with the angle that the line in first basic circle 14 centers of circle forms respectively, are designated as θ
1=20 °, i.e. air inlet is opened the two ends of breeze way 12 and is made line with first basic circle 14 centers of circle respectively, and the angle between two lines is 20 °, and the two ends that breeze way 13 is closed in air inlet are 22 ° with the angle that the line in first basic circle 14 centers of circle forms respectively, are designated as θ
2=22 °, i.e. air inlet is closed the two ends of breeze way 13 and is made line with first basic circle 14 centers of circle respectively, and the angle between two lines is 22 °, the angle forming with the line in first basic circle 14 centers of circle respectively by limiting two ends that air inlet opens breeze way 12, the angle that the two ends that breeze way 13 is closed in air inlet form with the line in first basic circle 14 centers of circle respectively, can effectively limit air inlet opens breeze way 12 and closes breeze way 13 with air inlet and correspond to the angle on the first basic circle 14, namely define air inlet unlatching breeze way 12 and air inlet and close the length of breeze way 13, make intake cam 1 in rotation process, intake cam 1 can be transitioned into air inlet active section 11 with the point of contact of air inlet plane tappet 2 stably from the first basic circle 14, and transit back stably the first basic circle 14 from air inlet active section 11.
The molded line cornerite of intake cam 1 is 192.7degCRA, and the molded line cornerite of intake cam 1 is specially the valve lift open side 1mm height of intake valve 3 and the valve lift of intake valve 3 is closed the crank angle between side 1mm height; Reach and meet the requirement of intake valve lift cornerite by limiting intake cam 1 profilogram, thereby effectively ensure that moment that intake valve 3 opens and closes and intake valve 3 open the accuracy of duration.
The radius of the first basic circle 14 is 16.5mm; The radius of the first basic circle 14 is set to after 16.5mm, the first basic circle 14 is matched with the maximum lift of air inlet active section 11, by the maximum lift of restriction air inlet active section 11 and the radius of the first basic circle 14, can in the situation that improving intake valve 3 lift, obtain an extraordinary intake cam 1 of Richness, directly ensure uniformity stressed in intake cam 1 rotation process and the stationarity of rotation.
Intake cam 1 is 9mm with the contact width of air inlet plane tappet 2, and wherein contact width refers to the width of intake cam 1 and the surface of contact of air inlet plane tappet 2, the thickness of intake cam 1 can be machined directly to 9mm man-hour adding; Be set to 9mm by intake cam 1 and the contact width of air inlet plane tappet 2, can ensure in intake cam 1 rotation process, intake valve 3 can be stable backed down, ensure that power that intake cam 1 is subject to is in can tolerance range, and needed power is not too large when intake cam 1 is rotated simultaneously.
It is 0～0.18mm that breeze way 12 corresponding lift is opened in air inlet, and the compensation rate that is used for eliminating distributing valve when intake valve 3 is opened and is total backlash is 0.18mm, and air inlet is opened the corresponding lift of breeze way 12 and is designated as h
r=0.18mm;
It is 0～0.2mm that the corresponding lift of breeze way 13 is closed in air inlet, be that intake valve 3 is used for eliminating that when hydraulic element cause loss of length's compensation rate and intake valve 3 is closed due to leakage, to stablize the compensation rate of taking a seat be 0.2mm while closing, air inlet is closed the corresponding lift of breeze way 13 and is designated as h
r=0.2mm;
By limiting, breeze way 12 is opened in air inlet and the corresponding lift of breeze way 13 is closed in air inlet, open breeze way 12 in conjunction with air inlet and close the angle on corresponding the first basic circle 14 of breeze way 13 with air inlet, can ensure in intake cam 1 rotation process, from the first basic circle 14 to air inlet active section 11, from 11 to first basic circle 14 transition stably of air inlet active section.
Wherein, the lift of intake cam 1 is characterized by multinomial dynamic equation formula, and multinomial dynamic equation formula is:
h＝(h
max-h
r)(1+c
2x
2+c
4x
4+c
px
p+c
qx
q+c
rx
r+c
sx
s)，
H is air inlet active section 11 lifts of intake cam 1;
H
maxfor the maximum lift of intake cam 1;
In intake valve 3 opening processes, h
rfor the corresponding lift of breeze way 12 is opened in air inlet, in intake valve 3 closing process, h
rfor the corresponding lift of breeze way 13 is closed in air inlet;
X is the angle of intake cam 1, in the process of opening at intake valve 3, the minimum value of x is 0 °, the maximum value of x is from the intersection point of air inlet unlatching breeze way 12 and air inlet active section 11 to the angle air inlet active section 11 maximum lift point, the occurrence of x is, air inlet active section 11 and air inlet are opened the intersection point of breeze way 12 to the angle between air inlet active section 11 and the point of contact of air inlet plane tappet 2, in intake valve 3 closing process, the minimum value of x is 0 °, the maximum value of x be close breeze way 13 and air inlet active section 11 from air inlet intersection point to the angle air inlet active section 11 maximum lift point, the occurrence of x is, air inlet active section 11 and air inlet are closed the intersection point of breeze way 13 to the angle between air inlet active section 11 and the point of contact of air inlet plane tappet 2, as can be seen here, the value of x is variable,
P, q, r, s is index, and according to the data of above-mentioned each intake cam 1 and corresponding design constraint, determines p=8, q=12, r=20, s=26;
C
4for parameter, and c
4=0.18, same, the c in multinomial dynamic equation formula
2, c
p, c
q, c
r, c
sall can be by calculating.
Wherein:
The concrete lift variation curve of intake cam 1 is referring to Fig. 3, and in figure, transverse axis is the angle that intake cam 1 rotates, and the longitudinal axis is that to rotate different amount are corresponding lifts to intake cam 1;
The speed change curves of intake cam 1 is referring to Fig. 4, and in figure, transverse axis is the angle that intake cam 1 rotates, and the longitudinal axis is the speed that intake cam 1 rotates;
The acceleration change curve of intake cam 1 is referring to Fig. 5, and in figure, transverse axis is the angle that intake cam 1 rotates, and the longitudinal axis is the acceleration of intake cam 1.
Below provide intake cam 1 molded line lift table in the present invention:
| Angle | Lift | Angle | Lift | Angle | Lift | Angle | Lift | Angle | Lift |
| (°) | (mm) | (°) | (mm) | (°) | (mm) | (°) | (mm) | (°) | (mm) |
| 0 | 0.0000 | 35 | 0.8633 | 70 | 6.6402 | 105 | 5.8370 | 140 | 0.3684 |
| 1 | 0.0001 | 36 | 0.9889 | 71 | 6.7313 | 106 | 5.6964 | 141 | 0.3316 |
| 2 | 0.0012 | 37 | 1.1264 | 72 | 6.8158 | 107 | 5.5499 | 142 | 0.3024 |
| 3 | 0.0035 | 38 | 1.2749 | 73 | 6.8935 | 108 | 5.3975 | 143 | 0.2791 |
| 4 | 0.0068 | 39 | 1.4336 | 74 | 6.9644 | 109 | 5.2395 | 144 | 0.2600 |
| 5 | 0.0111 | 40 | 1.6016 | 75 | 7.0286 | 110 | 5.0760 | 145 | 0.2437 |
| 6 | 0.0165 | 41 | 1.7776 | 76 | 7.0861 | 111 | 4.9072 | 146 | 0.2287 |
| 7 | 0.0230 | 42 | 1.9606 | 77 | 7.1368 | 112 | 4.7334 | 147 | 0.2143 |
| 8 | 0.0303 | 43 | 2.1495 | 78 | 7.1807 | 113 | 4.5549 | 148 | 0.2001 |
| 9 | 0.0387 | 44 | 2.3431 | 79 | 7.2178 | 114 | 4.3721 | 149 | 0.1858 |
| 10 | 0.0478 | 45 | 2.5403 | 80 | 7.2482 | 115 | 4.1852 | 150 | 0.1716 |
| 11 | 0.0578 | 46 | 2.7402 | 81 | 7.2718 | 116 | 3.9948 | 151 | 0.1575 |
| 12 | 0.0686 | 47 | 2.9416 | 82 | 7.2886 | 117 | 3.8014 | 152 | 0.1437 |
| 13 | 0.0800 | 48 | 3.1438 | 83 | 7.2987 | 118 | 3.6054 | 153 | 0.1301 |
| 14 | 0.0921 | 49 | 3.3457 | 84 | 7.3021 | 119 | 3.4076 | 154 | 0.1170 |
| 15 | 0.1047 | 50 | 3.5466 | 85 | 7.2987 | 120 | 3.2086 | 155 | 0.1042 |
| 16 | 0.1177 | 51 | 3.7457 | 86 | 7.2886 | 121 | 3.0092 | 156 | 0.0919 |
| 17 | 0.1312 | 52 | 3.9424 | 87 | 7.2718 | 122 | 2.8101 | 157 | 0.0802 |
| 18 | 0.1449 | 53 | 4.1362 | 88 | 7.2483 | 123 | 2.6124 | 158 | 0.0690 |
| 19 | 0.1589 | 54 | 4.3264 | 89 | 7.2181 | 124 | 2.4168 | 159 | 0.0586 |
| 20 | 0.1730 | 55 | 4.5126 | 90 | 7.1812 | 125 | 2.2245 | 160 | 0.0489 |
| 21 | 0.1871 | 56 | 4.6943 | 91 | 7.1376 | 126 | 2.0365 | 161 | 0.0399 |
| 22 | 0.2013 | 57 | 4.8713 | 92 | 7.0874 | 127 | 1.8538 | 162 | 0.0318 |
| 23 | 0.2158 | 58 | 5.0432 | 93 | 7.0304 | 128 | 1.6776 | 163 | 0.0245 |
| 24 | 0.2312 | 59 | 5.2098 | 94 | 6.9668 | 129 | 1.5089 | 164 | 0.0181 |
| 25 | 0.2487 | 60 | 5.3707 | 95 | 6.8966 | 130 | 1.3488 | 165 | 0.0126 |
| 26 | 0.2699 | 61 | 5.5258 | 96 | 6.8198 | 131 | 1.1984 | 166 | 0.0081 |
| 27 | 0.2963 | 62 | 5.6750 | 97 | 6.7364 | 132 | 1.0585 | 167 | 0.0046 |
| 28 | 0.3296 | 63 | 5.8180 | 98 | 6.6465 | 133 | 0.9299 | 168 | 0.0020 |
| 29 | 0.3716 | 64 | 5.9549 | 99 | 6.5500 | 134 | 0.8132 | 169 | 0.0005 |
| 30 | 0.4235 | 65 | 6.0853 | 100 | 6.4471 | 135 | 0.7088 | 170 | 0.0000 |
| 31 | 0.4866 | 66 | 6.2094 | 101 | 6.3377 | 136 | 0.6170 | ||
| 32 | 0.5618 | 67 | 6.3270 | 102 | 6.2220 | 137 | 0.5376 | ||
| 33 | 0.6495 | 68 | 6.4380 | 103 | 6.0999 | 138 | 0.4702 | ||
| 34 | 0.7500 | 69 | 6.5424 | 104 | 5.9715 | 139 | 0.4141 |
Further, as shown in Fig. 6～9, the embodiment of the present invention provides a kind of distribution cam mechanism of petrol engine, and wherein the maximum lift of exhaust cam 4 is 7.3mm, is designated as h
max=7.3mm, wherein, by exhaust work section 41 distance second basic circle 44 centers of circle point farthest and the lines in second basic circle 44 centers of circle, obtain the intersection point of line and the second basic circle 44, will in this intersection point and exhaust work section 41, obtain the maximum lift of exhaust cam 4 apart from the second basic circle 44 point line farthest; Be 7.3mm by the maximum lift that limits exhaust cam 4, can effectively improve the distribution performance of exhaust cam 4.
The angle that the two ends that breeze way 42 is opened in exhaust form with the line in second basic circle 44 centers of circle respectively, the two ends of exc. breeze way 43 are 20 ° with the angle that the line in second basic circle 44 centers of circle forms respectively, are designated as θ
1=θ
2=20 °, i.e. exhaust is opened the two ends of breeze way 42 and is made line with second basic circle 44 centers of circle respectively, and line is made with second basic circle 44 centers of circle respectively in the angle between two lines, the two ends of exc. breeze way 43, and the angle between two lines is 20 °, the angle forming with the line in second basic circle 44 centers of circle respectively by limiting two ends that exhaust opens breeze way 42, the angle that the two ends of exc. breeze way 43 form with the line in second basic circle 44 centers of circle respectively, can effectively limit exhaust unlatching breeze way 42 and correspond to the angle on the second basic circle 44 with exc. breeze way 43, namely define exhaust and open the length of breeze way 42 and exc. breeze way 43, make exhaust cam 4 in rotation process, exhaust cam 4 can be transitioned into exhaust work section 41 with the point of contact of exhaust plane tappet 5 stably from the second basic circle 44, and transit back stably the second basic circle 44 from exhaust work section 41.
The molded line cornerite of exhaust cam 4 is 201.4degCRA, and the molded line cornerite of exhaust cam 4 is specially the valve lift open side 1mm height of exhaust valve 6 and the valve lift of exhaust valve 6 is closed the crank angle between side 1mm height; Reach by limiting exhaust cam 4 lift profiles the valve lift cornerite requirement that meets exhaust valve 6, thereby effectively ensure that moment that exhaust valve 6 opens and closes and exhaust valve 6 open the accuracy of duration.
The radius of the second basic circle 44 is 16.5mm; The radius of the second basic circle 44 is set to after 16.5mm, the second basic circle 44 is matched with the maximum lift of exhaust work section 41, by the maximum lift of restriction exhaust work section 41 and the radius of the second basic circle 44, can in the situation that improving exhaust valve 6 lift, obtain an extraordinary exhaust cam 4 of Richness, directly ensure uniformity stressed in exhaust cam 4 rotation processes and the stationarity of rotation.
Exhaust cam 4 is 9mm with the contact width of exhaust plane tappet 5, and wherein contact width refers to the width of exhaust cam 4 and the surface of contact of exhaust plane tappet 5, the thickness of exhaust cam 4 can be machined directly to 9mm man-hour adding; Be set to 9mm by exhaust cam 4 and the contact width of exhaust plane tappet 5, can ensure in exhaust cam 4 rotation processes, exhaust valve 6 can be stable backed down, ensure that power that exhaust cam 4 is subject to is in can tolerance range, and needed power is not too large when exhaust cam 4 is rotated simultaneously.
The corresponding lift of breeze way 42 is opened in exhaust, the corresponding lift of exc. breeze way 43 is 0～0.22mm, be that to be used for eliminating distributing valve while opening be that the compensation rate of total backlash is 0.22mm to exhaust valve 6, exhaust valve 6 is used for while cutting out eliminating that when hydraulic element cause loss of length's compensation rate and make valve-closing due to leakage, to stablize the compensation rate of taking a seat be 0.22mm, and breeze way 42 is opened in exhaust, the corresponding lift of exc. breeze way 43 is all designated as h
r=0.22mm.
Open breeze way 42 and the corresponding lift of exc. breeze way 43 by limiting exhaust, open the angle on breeze way 42 and corresponding the second basic circle 44 of exc. breeze way 43 in conjunction with exhaust, can ensure in exhaust cam 4 rotation processes, from the second basic circle 44 to exhaust work section 41, from 41 to second basic circle 44 transition stably of exhaust work section.
Wherein, the lift of exhaust cam 4 is characterized by multinomial dynamic equation formula, and multinomial dynamic equation formula is:
h＝(h
max-h
r)(1+c
2x
2+c
4x
4+c
px
p+c
qx
q+c
rx
r+c
sx
s)，
H is exhaust work section 41 lifts of exhaust cam 4;
H
maxfor the maximum lift of exhaust cam 4;
In exhaust valve 6 opening processes, h
rby the corresponding lift of breeze way 42 is opened in exhaust, in exhaust valve 6 closing process, h
rfor the corresponding lift of exc. breeze way 43;
X is the angle of exhaust cam 4, in the process of opening at exhaust valve 6, the minimum value of x is 0 °, the maximum value of x is from the intersection point of exhaust unlatching breeze way 42 and exhaust work section 41 to the angle exhaust work section 41 maximum lift point, the occurrence of x is, exhaust work section 41 and exhaust are opened the intersection point of breeze way 42 to the angle between exhaust work section 41 and the point of contact of exhaust plane tappet 5, in exhaust valve 6 closing process, the minimum value of x is 0 °, the maximum value of x is from the intersection point of exc. breeze way 43 and exhaust work section 41 to the angle exhaust work section 41 maximum lift point, the occurrence of x is, the intersection point of exhaust work section 41 and exc. breeze way 43 is to the angle between exhaust work section 41 and the point of contact of exhaust plane tappet 5, as can be seen here, the value of x is variable,
P, q, r, s is index, and according to the data of above-mentioned each exhaust cam 4 and corresponding design constraint, determines p=6, q=18, r=26, s=34;
C
4for parameter, and c
4=0.2～0.26, the c in multinomial dynamic equation formula
2, c
p, c
q, c
r, c
sall can be by calculating.
Wherein:
The concrete lift variation curve of exhaust cam 4 is referring to Fig. 7, and in figure, transverse axis is the angle that exhaust cam 4 rotates, and the longitudinal axis is that to rotate different amount are corresponding lifts to exhaust cam 4;
The speed change curves of exhaust cam 4 is referring to Fig. 8, and in figure, transverse axis is the angle that exhaust cam 4 rotates, and the longitudinal axis is the speed that exhaust cam 4 rotates;
The acceleration change curve of exhaust cam 4 is referring to Fig. 9, and in figure, transverse axis is the angle that exhaust cam 4 rotates, and the longitudinal axis is the acceleration of exhaust cam 4.
Below provide exhaust cam 4 molded line lift tables in the present invention:
| Angle | Lift | Angle | Lift | Angle | Lift | Angle | Lift | Angle | Lift |
| (°) | (mm) | (°) | (mm) | (°) | (mm) | (°) | (mm) | (°) | (mm) |
| 0 | 0.0000 | 35 | 0.9971 | 70 | 6.5726 | 105 | 6.0306 | 140 | 0.5785 |
| 1 | 0.0002 | 36 | 1.1261 | 71 | 6.6663 | 106 | 5.9033 | 141 | 0.5092 |
| 2 | 0.0015 | 37 | 1.2648 | 72 | 6.7537 | 107 | 5.7705 | 142 | 0.4507 |
| 3 | 0.0042 | 38 | 1.4125 | 73 | 6.8347 | 108 | 5.6325 | 143 | 0.4021 |
| 4 | 0.0083 | 39 | 1.5682 | 74 | 6.9093 | 109 | 5.4892 | 144 | 0.3625 |
| 5 | 0.0136 | 40 | 1.7310 | 75 | 6.9774 | 110 | 5.3411 | 145 | 0.3305 |
| 6 | 0.0202 | 41 | 1.9001 | 76 | 7.0391 | 111 | 5.1881 | 146 | 0.3045 |
| 7 | 0.0281 | 42 | 2.0746 | 77 | 7.0944 | 112 | 5.0306 | 147 | 0.2828 |
| 8 | 0.0371 | 43 | 2.2535 | 78 | 7.1431 | 113 | 4.8688 | 148 | 0.2638 |
| 9 | 0.0472 | 44 | 2.4361 | 79 | 7.1853 | 114 | 4.7030 | 149 | 0.2460 |
| 10 | 0.0585 | 45 | 2.6214 | 80 | 7.2210 | 115 | 4.5334 | 150 | 0.2287 |
| 11 | 0.0707 | 46 | 2.8088 | 81 | 7.2502 | 116 | 4.3604 | 151 | 0.2114 |
| 12 | 0.0838 | 47 | 2.9974 | 82 | 7.2729 | 117 | 4.1844 | 152 | 0.1942 |
| 13 | 0.0978 | 48 | 3.1867 | 83 | 7.2891 | 118 | 4.0056 | 153 | 0.1771 |
| 14 | 0.1125 | 49 | 3.3759 | 84 | 7.2989 | 119 | 3.8245 | 154 | 0.1603 |
| 15 | 0.1279 | 50 | 3.5644 | 85 | 7.3021 | 120 | 3.6416 | 155 | 0.1439 |
| 16 | 0.1439 | 51 | 3.7516 | 86 | 7.2989 | 121 | 3.4574 | 156 | 0.1279 |
| 17 | 0.1603 | 52 | 3.9371 | 87 | 7.2892 | 122 | 3.2723 | 157 | 0.1125 |
| 18 | 0.1771 | 53 | 4.1203 | 88 | 7.2730 | 123 | 3.0869 | 158 | 0.0978 |
| 19 | 0.1942 | 54 | 4.3009 | 89 | 7.2504 | 124 | 2.9017 | 159 | 0.0838 |
| 20 | 0.2114 | 55 | 4.4783 | 90 | 7.2214 | 125 | 2.7175 | 160 | 0.0707 |
| 21 | 0.2287 | 56 | 4.6522 | 91 | 7.1859 | 126 | 2.5349 | 161 | 0.0585 |
| 22 | 0.2460 | 57 | 4.8222 | 92 | 7.1440 | 127 | 2.3546 | 162 | 0.0472 |
| 23 | 0.2638 | 58 | 4.9881 | 93 | 7.0957 | 128 | 2.1773 | 163 | 0.0371 |
| 24 | 0.2830 | 59 | 5.1495 | 94 | 7.0410 | 129 | 2.0039 | 164 | 0.0281 |
| 25 | 0.3051 | 60 | 5.3062 | 95 | 6.9800 | 130 | 1.8350 | 165 | 0.0202 |
| 26 | 0.3318 | 61 | 5.4580 | 96 | 6.9127 | 131 | 1.6717 | 166 | 0.0136 |
| 27 | 0.3650 | 62 | 5.6046 | 97 | 6.8390 | 132 | 1.5146 | 167 | 0.0083 |
| 28 | 0.4063 | 63 | 5.7459 | 98 | 6.7592 | 133 | 1.3648 | 168 | 0.0042 |
| 29 | 0.4571 | 64 | 5.8816 | 99 | 6.6731 | 134 | 1.2229 | 169 | 0.0015 |
| 30 | 0.5184 | 65 | 6.0116 | 100 | 6.5809 | 135 | 1.0898 | 170 | 0.0002 |
| 31 | 0.5910 | 66 | 6.1359 | 101 | 6.4827 | 136 | 0.9663 | 171 | 0.0000 |
| 32 | 0.6753 | 67 | 6.2542 | 102 | 6.3784 | 137 | 0.8530 | ||
| 33 | 0.7712 | 68 | 6.3665 | 103 | 6.2683 | 138 | 0.7503 | ||
| 34 | 0.8787 | 69 | 6.4726 | 104 | 6.1523 | 139 | 0.6588 |
The present invention is by limiting the maximum lift of intake cam 1 and exhaust cam 4, the cornerite of intake cam 1 and exhaust cam 4, the parameter of the molded line of the intake cams such as the radius of the first basic circle 14 and the second basic circle 44 1 and exhaust cam 4, directly ensure that intake cam 1 and exhaust cam 4 reasonably drive into valve 3 and exhaust valve 6, can obtain intake cam 1 and exhaust cam 4 that Richness is higher, directly ensure uniformity stressed in intake cam and exhaust cam 4 rotation processes, open the two ends of breeze way 12 and the angle forming with the line in first basic circle 14 centers of circle respectively by limiting air inlet simultaneously, the angle that the two ends that breeze way 13 is closed in air inlet form with the line in first basic circle 14 centers of circle respectively, the angle that the two ends that breeze way 42 is opened in exhaust form with the line in second basic circle 44 centers of circle respectively, the angle that the two ends of exc. breeze way 43 form with the line in second basic circle 44 centers of circle respectively, can make the first basic circle 14 and air inlet active section 11 on intake cam 1, transition stably between the second basic circle 44 and exhaust work section 41 on exhaust cam 4, thereby ensure the stationarity that intake cam 1 and exhaust cam 4 rotate, ensure the working life of intake cam 1 and exhaust cam 4.
The present invention considers the structural feature of the distribution cam mechanism that adopts plane tappet outlet valve system, specifically be applicable to the distribution cam mechanism of natural aspiration vehicle gasoline engine, to ensure to meet the requirement of natural aspiration vehicle gasoline engine power economy performance, there are intake cam 1, exhaust cam 4 line smoothing transition, the advantage that adaptability is good, both petrol engine distribution performance requirement can be met, and the requirement of distribution cam mechanism stationarity can be ensured again.
It should be noted that: be directly to adopt profile processing provided by the invention or adopt pattern processing all to belong to the scope of protection of the invention.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a distribution cam mechanism for petrol engine, the distribution cam mechanism of described petrol engine comprises intake cam, exhaust cam, air inlet plane tappet, exhaust plane tappet, intake valve and exhaust valve, it is characterized in that,
The molded line of described intake cam comprises that breeze way is opened in air inlet active section, air inlet, breeze way and the first basic circle are closed in air inlet, one end of described air inlet active section is opened breeze way by described air inlet and is connected with described the first basic circle, and the other end of described air inlet active section is closed breeze way by described air inlet and is connected with described the first basic circle;
The two ends that breeze way is opened in described air inlet are 20 ° with the angle that the line in the described first basic circle center of circle forms respectively, the two ends that breeze way is closed in described air inlet are 22 ° with the angle that the line in the described first basic circle center of circle forms respectively, and the maximum lift of described intake cam is 7.3mm;
The molded line of described exhaust cam comprises exhaust work section, exhaust unlatching breeze way, exc. breeze way and the second basic circle, one end of described exhaust work section is opened breeze way by described exhaust and is connected with described the second basic circle, and the other end of described exhaust work section is connected with described the second basic circle by described exc. breeze way;
The angle that the two ends that breeze way is opened in described exhaust form with the line in the described second basic circle center of circle respectively, the two ends of described exc. breeze way are 20 ° with the angle that the line in the described second basic circle center of circle forms respectively, the maximum lift of described exhaust cam is 7.3mm
Described the first basic circle and described the second Base radius are 16.5mm.
2. the distribution cam mechanism of petrol engine according to claim 1, is characterized in that, the molded line cornerite of described intake cam is 192.7degCRA.
3. the distribution cam mechanism of petrol engine according to claim 1, is characterized in that, the molded line cornerite of described exhaust cam is 201.4degCRA.
4. the distribution cam mechanism of petrol engine according to claim 1, is characterized in that, the contact width of described intake cam and the contact width of described air inlet plane tappet, described exhaust cam and described exhaust plane tappet is 9mm.
5. the distribution cam mechanism of petrol engine according to claim 1, is characterized in that, the lift that breeze way is opened in described air inlet is 0～0.18mm.
6. the distribution cam mechanism of petrol engine according to claim 5, is characterized in that, the lift that breeze way is closed in described air inlet is 0～0.2mm.
7. the distribution cam mechanism of petrol engine according to claim 6, is characterized in that, the lift of breeze way is opened in described exhaust, the lift of described exc. breeze way is 0～0.22mm.
8. the distribution cam mechanism of petrol engine according to claim 7, is characterized in that, the air inlet active section lift of described intake cam adopts multinomial dynamic equation formula to characterize, and described multinomial dynamic equation formula is:
h＝(h
max-h
r)(1+c
2x
2+c
4x
4+c
px
p+c
qx
q+c
rx
r+c
sx
s)，
Wherein,
H is the described air inlet active section lift of described intake cam;
H
maxfor the maximum lift of described intake cam;
In described IO Intake Valve Opens process, h
rfor the lift of described air inlet unlatching breeze way, in described IC Intake Valve Closes process, h
rfor the lift of breeze way is closed in described air inlet;
In described IO Intake Valve Opens process, the angle that x forms to the line in the described first basic circle center of circle to the point of contact of the line in the described first basic circle center of circle, described air inlet active section and air inlet plane tappet for the intersection point of described air inlet active section and described air inlet unlatching breeze way, in the process of described IC Intake Valve Closes, x closes the angle that the intersection point of breeze way forms to the line in the described first basic circle center of circle to the point of contact of the line in the described first basic circle center of circle, described air inlet active section and air inlet plane tappet for described air inlet active section and air inlet;
P, q, r, s is index, and p=8, q=12, r=20, s=26;
C
4for parameter, and c
4=0.18.
9. the distribution cam mechanism of petrol engine according to claim 8, is characterized in that, the exhaust work section lift of described exhaust cam adopts multinomial dynamic equation formula to characterize, and described multinomial dynamic equation formula is:
h＝(h
max-h
r)(1+c
2x
2+c
4x
4+c
ox
p+c
qx
q+c
rx
r+c
sx
s)，
Wherein,
H is the described exhaust work section lift of described exhaust cam;
H
maxfor the maximum lift of described exhaust cam;
In described exhauxt valve opens process, h
rfor the lift of described exhaust unlatching breeze way, in described exhaust valve closing process, h
rfor the lift of described exc. breeze way;
In described exhauxt valve opens process, the angle that x forms to the line in the described second basic circle center of circle to the point of contact of the line in the described second basic circle center of circle, described exhaust work section and exhaust plane tappet for the intersection point of described exhaust work section and described exhaust unlatching breeze way, in the process of described exhaust valve closing, the angle that the intersection point that x is described exhaust work section and exc. breeze way forms to the line in the described second basic circle center of circle to the point of contact of the line in the described second basic circle center of circle, described exhaust work section and exhaust plane tappet;
P, q, r, s is index, and p=6, q=18, r=26, s=34;
C
4for parameter, and c
4=0.2～0.26.
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|---|---|---|---|
| CN201410175580.8A CN103967550A (en) | 2014-04-28 | 2014-04-28 | Distribution cam mechanism of gasoline engine |
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ID=51237502
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115263483A (en) * | 2022-07-01 | 2022-11-01 | 奇瑞汽车股份有限公司 | Cam, camshaft and engine |
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