CN201730648U - Low-emission engine camshaft - Google Patents
Low-emission engine camshaft Download PDFInfo
- Publication number
- CN201730648U CN201730648U CN2010202566533U CN201020256653U CN201730648U CN 201730648 U CN201730648 U CN 201730648U CN 2010202566533 U CN2010202566533 U CN 2010202566533U CN 201020256653 U CN201020256653 U CN 201020256653U CN 201730648 U CN201730648 U CN 201730648U
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- cam
- valve
- engine
- low
- camshaft
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- Expired - Fee Related
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Abstract
A low-emission engine camshaft comprises a shaft body, a journal and a plurality of cams. The camshaft is characterized in that cam rotation angles beta corresponding to the cam driving a valve to be fully open are 30+/-5 degrees, return pressure angles alpha of the cams are 40+/-2 degrees. By enlarging the cam rotation angles corresponding to the fully opened valve, the low-emission engine camshaft leads engine exhaust to be more thorough and air inlet to be more sufficient, and further achieves the purpose of reducing emission pollution of an engine.
Description
(1) technical field: the present invention relates to a kind of camshaft that gasoline and diesel engine inlet and outlet door open and close that is used to drive, particularly a kind ofly can make gasoline and the diesel engine air inlet is more abundant, exhaust low emission level engine camshaft more completely.
(2) prior art: therefore plurality of advantages such as volume is little, in light weight because gasoline and diesel engine have, power foot, efficient is high, supply of fuel is convenient have obtained using the most widely on automobile, tractor, naval vessel, railway locomotive and all kinds of Working machine.Yet gasoline and diesel engine in use can be discharged the various harmful gases that are detrimental to health, and pollute human environment of depending on for existence.
A large amount of studies show that, reduces gasoline and diesel engine exhaust and pollutes effective measures and be: the charging efficiency (make exhaust is more thorough, air inlet is more abundant) that 1. improves motor as far as possible; But 2. make fuel oil, gas mixed gas mix more even; 3. effectively organize the burning of inflammable mixture, it is more thorough to make it burning.
Whether the cam profile structure that drives engine valve (intake valve and exhaust valve) open and close is abundant to the air inlet of motor, whether exhaust thoroughly has a direct impact.Its reason is: opening and closing of cam drive valve is a progressive formation, be valve by be closed to complete opening and valve by standard-sized sheet in the process of closing fully, because valve is in the part opening state, therefore, the gas-flow resistance of this process and throughput are all much smaller than the valve full-gear, and the charging efficiency that must influence motor like this is that exhaust is thorough inadequately, air inlet is abundant inadequately.Raising motor charging efficiency comparatively effective method is to shorten valve opening and the process of closing, promptly increase the pressure angle of cam, but increase along with the cam pressure angle, the surface friction drag that cam promotes the valve opening process not only can increase thereupon, and when pressure angle increases to certain value, self-locking just takes place in cam mechanism, and cam mechanism just loses the ability that drives valve opening, and the process that promptly shortens valve opening is subjected to the restriction of cam pressure angle (cam pressure angle≤38 °).Traditional engine cam nearly all adopts symmetrical structure, and promptly cam rise molded lines and backhaul molded lines are symmetrical fully.The cam drive valve of this pattern is opened pairing protruding Shaft angle fully and is driven valve and equated fully to closing pairing protruding Shaft angle fully by standard-sized sheet by being closed to.
(3) summary of the invention: the purpose of this utility model is improved existing cam profile structure exactly, provides a kind of and can make gasoline and the diesel engine air inlet is more abundant, exhaust low emission level engine camshaft more completely.
Low emission level engine camshaft of the present utility model comprises axis body, and axle journal and some cams is characterized in that: the pairing cam angle β of described cam drive valve standard-sized sheet is 30 ° ± 5 °, and cam backhaul pressure angle a is 40 ° ± 2 °
The utility model is owing to adopted a kind of new type of cam molded lines structure of asymmetric, and promptly cam profile is made of A section (cam rise molded lines), B section (valve standard-sized sheet molded lines) and C section (the backhaul molded lines of cam).Wherein B section molded lines is the circular arc line segment concentric with cam base circle; In order to ensure cam mechanism self-locking does not take place, and the surface friction drag of cam drive valve motion is unlikely too big, still keeps pressure angle≤35 of cam rise molded lines ° constant; The pairing cam angle β of valve standard-sized sheet is increased to about 30 ° for 15 ° by the deficiency of conventional construction, and the pressure angle a of cam backhaul correspondence is increased to about 40 ° by 35 ° of conventional construction.Although the increase of the cam angle of cam backhaul correspondence can increase the pressure angle of cam backhaul molded lines, but because the increase of cam backhaul molded lines pressure angle can not cause the increase of cam surface friction drag and the self-locking of cam mechanism, therefore the utility model camshaft has increased the pairing cam angle of valve standard-sized sheet, reduced gas-flow resistance, can make that engine exhaust is more thorough, air inlet is more abundant, and then reach and reduce the purpose that engine exhaust pollutes.
(4) description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the schematic representation of the utility model cam.
Among the figure, 1-axis body, 2-axle journal, 3-cam, 4-A section, 5-B section, 6-C section, 7-cam base circle.
(5) embodiment:
Referring to Fig. 1, the utility model comprises axis body 1, and axle journal 2 and some cams 3 have illustrated the molded lines structure of cam among Fig. 2, promptly be made of A section 4 (cam rise molded lines), B section 5 (valve standard-sized sheet molded lines) and C section 6 (the backhaul molded lines of cam).Wherein B section molded lines is the circular arc line segment concentric with cam base circle 7; Its segmental arc Origin And Destination is to the pairing angle in the cam base circle center of circle, be that the pairing cam angle β of described cam drive valve standard-sized sheet is 30 ° ± 5 °, cam backhaul pressure angle a is that the angle between engine valve axis m-m and the cam normal n-n is 40 ° ± 5 °.
Claims (1)
1. the low emission level engine camshaft comprises axis body, and axle journal and some cams is characterized in that: the pairing cam angle β of described cam drive valve standard-sized sheet is 30 ° ± 5 °, and cam backhaul pressure angle a is 40 ° ± 2 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202566533U CN201730648U (en) | 2010-07-03 | 2010-07-03 | Low-emission engine camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202566533U CN201730648U (en) | 2010-07-03 | 2010-07-03 | Low-emission engine camshaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201730648U true CN201730648U (en) | 2011-02-02 |
Family
ID=43521806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202566533U Expired - Fee Related CN201730648U (en) | 2010-07-03 | 2010-07-03 | Low-emission engine camshaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201730648U (en) |
-
2010
- 2010-07-03 CN CN2010202566533U patent/CN201730648U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110202 Termination date: 20120703 |