CN204238997U - The asymmetric intake cam of a kind of vehicular engine - Google Patents
The asymmetric intake cam of a kind of vehicular engine Download PDFInfo
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- CN204238997U CN204238997U CN201420653631.9U CN201420653631U CN204238997U CN 204238997 U CN204238997 U CN 204238997U CN 201420653631 U CN201420653631 U CN 201420653631U CN 204238997 U CN204238997 U CN 204238997U
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Abstract
This application discloses the asymmetric intake cam of a kind of vehicular engine, its cam profile comprises basic circle and cam peach, the cornerite of the valve opening side active section on described cam peach is less than the cornerite of valve-closing side active section, and the fullness coefficient of the cam profile of the cam profile of valve opening side and valve-closing side is all more than or equal to 0.57.In the asymmetric intake cam of the vehicular engine that the utility model provides, the cornerite of the valve opening side active section on cam peach is less than the cornerite of valve-closing side active section, and the fullness coefficient of the cam profile of the cam profile of valve opening side and valve-closing side is all more than or equal to 0.57, both the charging efficiency of every side had been made to improve, and cam profile adopts non-symmetry structure to achieve opening fast and slowly closing of valve, further increase charging efficiency, improve distribution performance.
Description
Technical field
The utility model relates to engine cam technical field, particularly the asymmetric intake cam of a kind of vehicular engine.
Background technique
Distribution device is the core of motor, and the Profile Design of valve cam is one of important channel of valve train optimization design, and whether reasonable in design it is is directly connected to the power character of internal-combustion engine, Economy and reliability.Good design of cam contour line can make full use of air inlet inertia to improve charging efficiency, thus improves the performance of motor.Bad design of cam contour line can cause motor charging efficiency low, and power moment of torsion is low, the insufficient lubrication between cam and tappet, causes parts depreciation abnormal, and air valve drop also can be caused to bounce for severe patient and distribution device occurs flying off phenomenon.
The cam profile that existing compact vehicle engine uses mostly adopts symmetrical Profile Design, have design parameter few, adjust simple advantage; But along with people export improving constantly of requirement to performance, kinology and the durability of each system of motor and component will become deterioration, such as: when performance design, charging efficiency is promoted with slowly closing by opening fast of valve, but symmetrical molded line is difficult to accomplish both taking into account, can only to compromise choice, finally not reach desirable distribution effect.
In sum, how to solve the distribution poor effect of existing intake cam, higher performance cannot be met and export the problem required, become those skilled in the art's problem demanding prompt solution.
Model utility content
In view of this, the purpose of this utility model is to provide a kind of vehicular engine asymmetric intake cam, opens fast, the distribution performance of slowly closing to reach valve, improves charging efficiency.
For achieving the above object, the utility model provides following technological scheme:
The asymmetric intake cam of a kind of vehicular engine, its cam profile comprises basic circle and cam peach, the cornerite of the valve opening side active section on described cam peach is less than the cornerite of valve-closing side active section, and the fullness coefficient of the cam profile of the cam profile of valve opening side and valve-closing side is all more than or equal to 0.57.
Preferably, in the asymmetric intake cam of above-mentioned vehicular engine, the cornerite of described valve opening side active section is 62 ° ~ 64 °, and the cornerite of described valve-closing side active section is 65 ° ~ 67 °.
Preferably, in the asymmetric intake cam of above-mentioned vehicular engine, described basic circle and described cam peach intersect at the two-end-point of a diameter line of described basic circle, be valve opening end points a and valve shutdown side point b respectively, and the radial center of the center of circle of described basic circle and described cam peach coincide with the central point of cam.
Preferably, in the asymmetric intake cam of above-mentioned vehicular engine, described base radius of a circle is 16mm ~ 17mm, and cam maximum lift is 7.15mm ~ 8mm, and cam breeze way lift is 0.2mm ~ 0.3mm.
Preferably, in the asymmetric intake cam of above-mentioned vehicular engine, described cam peach is provided with breeze way starting point, eliminates valve clearance point, valve maximum lift point, valve-closing point and breeze way end point completely; Beginning angle between described valve opening end points a and described breeze way starting point is 12 ° ~ 14 °; Described breeze way starting point and the described unlatching breeze way angle eliminated completely between the point of valve clearance are 14 ~ 16 °; The described valve opening section angle eliminated between valve clearance point and described valve maximum lift point is completely 62 ° ~ 64 °; Closing flank angle between described valve maximum lift point and described valve-closing point is 65 ° ~ 67 °; Closedown breeze way angle between described valve-closing point and described breeze way end point is 14 ° ~ 16 °; Described angle at the end of closing between buffering end point and described valve-closing end points is 9 ° ~ 11 °.
Compared with prior art, the beneficial effects of the utility model are:
In the asymmetric intake cam of the vehicular engine that the utility model provides, the cornerite of the valve opening side active section on cam peach is less than the cornerite of valve-closing side active section, and the fullness coefficient of the cam profile of the cam profile of valve opening side and valve-closing side is all more than or equal to 0.57, both the charging efficiency of every side had been made to improve, and cam profile adopts non-symmetry structure to achieve opening fast and slowly closing of valve, further increase charging efficiency, improve distribution performance.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The structural representation of the cam profile of the asymmetric intake cam of a kind of vehicular engine that Fig. 1 provides for the utility model embodiment.
In FIG, 1 be basic circle, 2 be cam peach, 3 be cam center point, 4 be breeze way starting point, 5 be valve maximum lift point for eliminating valve clearance point, 6 completely, 7 be valve-closing point, 8 be breeze way end point, 9 be valve opening section angle for starting angle, 10 for opening breeze way angle, 11,12 be closing flank angle, 13 in order to close, breeze way angle, 14 is angle at the end, a is valve opening end points, b is valve-closing end points.
Embodiment
Core of the present utility model there is provided the asymmetric intake cam of a kind of vehicular engine, can reach that valve is opened fast, the distribution performance of slowly closing, improves charging efficiency.
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technological scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Please refer to Fig. 1, the utility model embodiment provides the asymmetric intake cam of a kind of vehicular engine, hereinafter referred to as intake cam, this vehicular engine is naturally aspirated engine, its cam profile adopts ISAC (Polynomial Dynamics) design method to design, comprise basic circle 1 and cam peach 2, wherein, cam peach 2 is totally divided into valve opening side breeze way, valve-closing side breeze way and active section, active section is divided into valve opening side active section and valve-closing side active section by cam centre line, in the present embodiment, the cornerite of valve opening side active section is less than the cornerite of valve-closing side active section, and the fullness coefficient of the cam profile of the cam profile of valve opening side and valve-closing side is all greater than 0.57.
Above-mentioned intake cam is less than the cornerite of valve-closing side active section due to the cornerite of valve opening side active section, make the speed of valve opening fast, the speed of closing is slow, compared with existing symmetric type cam profile, can fully air inlet, improve charging efficiency, and the fullness coefficient of the cam profile of both sides is more than or equal to 0.57, the larger then charging efficiency of fullness coefficient is higher, further increases the distribution performance of cam.
As optimization, the cornerite of the valve opening side active section in the present embodiment is 62 ° ~ 64 °, be more preferably 63 °, the cornerite of valve-closing side active section is 65 ° ~ 67 °, the cornerite of valve opening side active section is more preferably 66 °, as long as can be made to be less than the cornerite of valve-closing side active section.Be not limited to the numerical value cited by the present embodiment and scope.
Further, basic circle 1 and cam peach 2 intersect at the two-end-point of a diameter line of basic circle 1, be valve opening end points a and valve shutdown side point b respectively, and the radial center of the center of circle of basic circle 1 and cam peach 2 coincide with cam center point 3.Such design can make cam profile have larger buffering and working zone, can improve charging efficiency further.
In the present embodiment, the radius of basic circle 1 is 16mm ~ 17mm, and the maximum lift of cam is 7.15mm ~ 8mm, and be preferably 7.65mm, cam breeze way lift is 0.2mm ~ 0.3mm.The charging efficiency that can improve cam further is so set.
In the present embodiment, the composition of cam peach 2 is described, cam peach 2 is disposed with breeze way starting point 4 along a direction, eliminates valve clearance point 5, valve maximum lift point 6, valve-closing point 7 and breeze way end point 8 completely; Wherein, the beginning angle 9 between valve opening end points a and breeze way starting point 4 is 12 ° ~ 14 °, is more preferably 13 °; Breeze way starting point 4 and the unlatching breeze way angle 10 eliminated completely between valve clearance point 5 are 14 ~ 16 °, are more preferably 15 °, and this section is valve opening side breeze way; The valve opening section angle 11 eliminated between valve clearance point 5 and valve maximum lift point 6 is 62 ° ~ 64 ° completely, and be more preferably 63 °, this section is valve opening side active section; Closing flank angle 12 between valve maximum lift point 6 and valve-closing point 7 is 65 ° ~ 67 °, is more preferably 66 °, and this section is valve-closing side active section; Closedown breeze way angle 13 between valve-closing point 7 and breeze way end point 8 is 14 ° ~ 16 °, is more preferably 15 °, and this section is valve-closing side breeze way; Angle at the end 14 between breeze way end point 8 and valve-closing end points b is 9 ° ~ 11 °, is more preferably 10 °.Can find out, the data of valve opening side and valve-closing side are asymmetric, and particularly the angle of valve opening side active section is less than the angle of valve-closing side active section, can realize valve like this and open fast and slowly closing, promote charging efficiency.
The utility model one embodiment provides a kind of lift table of concrete cam profile, and wherein, cam profile opening side lift table is as shown in table 1:
Table 1 is cam profile opening side lift table
The lift table of valve-closing side is as shown in table 2:
Table 2 is cam profile closedown side lift table
Above-mentioned cam profile lift table is a kind of way of example, is not limited to the numerical value cited by above form.
This automotive natural aspirated engine has the performance index of torque per liter 97.8N.m/L, power per liter 56Kw/L, there is the performance level of 105.5N.m/2000r/min, 118N.m/3200r/min and 67.5Kw/6000r/min simultaneously, for automotive natural aspirated engine, it is extremely very difficult for reaching this performance level.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. the asymmetric intake cam of vehicular engine, its cam profile comprises basic circle (1) and cam peach (2), it is characterized in that, the cornerite of the valve opening side active section on described cam peach (2) is less than the cornerite of valve-closing side active section, and the fullness coefficient of the cam profile of the cam profile of valve opening side and valve-closing side is all more than or equal to 0.57.
2. the asymmetric intake cam of vehicular engine according to claim 1, is characterized in that, the cornerite of described valve opening side active section is 62 ° ~ 64 °, and the cornerite of described valve-closing side active section is 65 ° ~ 67 °.
3. the asymmetric intake cam of vehicular engine according to claim 2, it is characterized in that, described basic circle (1) and described cam peach (2) intersect at the two-end-point of a diameter line of described basic circle (1), be valve opening end points a and valve shutdown side point b respectively, and the radial center of the center of circle of described basic circle (1) and described cam peach (2) coincide with cam center point (3).
4. the asymmetric intake cam of vehicular engine according to claim 3, is characterized in that, the radius of described basic circle (1) is 16mm ~ 17mm, and cam maximum lift is 7.15mm ~ 8mm, and cam breeze way lift is 0.2mm ~ 0.3mm.
5. the asymmetric intake cam of vehicular engine according to claim 4, it is characterized in that, described cam peach (1) is provided with breeze way starting point (4), eliminates valve clearance point (5), valve maximum lift point (6), valve-closing point (7) and breeze way end point (8) completely; Beginning angle (9) between described valve opening end points a and described breeze way starting point (4) is 12.5 ° ~ 13.5 °; Described breeze way starting point (4) and the described unlatching breeze way angle (10) eliminated completely between valve clearance point (5) are 14.5 ~ 15.5 °; The described valve opening section angle (11) eliminated between valve clearance point (5) and described valve maximum lift point (6) is completely 62 ° ~ 64 °; Closing flank angle (12) between described valve maximum lift point (6) and described valve-closing point (7) is 65 ° ~ 67 °; Closedown breeze way angle (13) between described valve-closing point (7) and described breeze way end point (8) is 14 ° ~ 16 °; Described angle at the end (14) of closing between buffering end point (8) and described valve-closing end points b is 9 ° ~ 11 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420653631.9U CN204238997U (en) | 2014-10-31 | 2014-10-31 | The asymmetric intake cam of a kind of vehicular engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420653631.9U CN204238997U (en) | 2014-10-31 | 2014-10-31 | The asymmetric intake cam of a kind of vehicular engine |
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| CN204238997U true CN204238997U (en) | 2015-04-01 |
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| CN201420653631.9U Expired - Fee Related CN204238997U (en) | 2014-10-31 | 2014-10-31 | The asymmetric intake cam of a kind of vehicular engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104358598A (en) * | 2014-10-31 | 2015-02-18 | 力帆实业(集团)股份有限公司 | Vehicle engine asymmetrical air inlet cam |
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2014
- 2014-10-31 CN CN201420653631.9U patent/CN204238997U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104358598A (en) * | 2014-10-31 | 2015-02-18 | 力帆实业(集团)股份有限公司 | Vehicle engine asymmetrical air inlet cam |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150401 Termination date: 20191031 |
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| CF01 | Termination of patent right due to non-payment of annual fee |