CN1252488A - Gear-driven two-top camshaft air distributor - Google Patents
Gear-driven two-top camshaft air distributor Download PDFInfo
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- CN1252488A CN1252488A CN 99126053 CN99126053A CN1252488A CN 1252488 A CN1252488 A CN 1252488A CN 99126053 CN99126053 CN 99126053 CN 99126053 A CN99126053 A CN 99126053A CN 1252488 A CN1252488 A CN 1252488A
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Abstract
The air distributor has two sets of air inlet cams and air outlet cams arranged symmetrically on two sides of the center line on the top of cylinder, and gears meshed separately with the air inlet cams and air outlet cams, and the gears meshed with one st of air inlet cam and the gears with one set of air outlet cams are meshed with each other. The compact air distributor is suitable for multiple-gate air distribution, and has large air passing cross section, and thus, high inflation coefficient and efficiency. The present invention makes it possible to reduce the size of single gate, and thus, to raise the rigidity of gate and improve the dynamic performance of air distributor.
Description
The present invention relates to petrol engine cylinder intake/exhaust distribution control technique, specifically, relate to a kind of two-top camshaft air distributor.
Petrolic cylinder adopts lower arranging cam axle type valve actuating mechanism or overhead cam driving mode usually, with intake valve and the exhaust valve and the cylinder inner carrier cooperation of control and adjusting cylinder, so as to realizing four-stroke work.From actual use condition, the what is called " Single Over Head Camshaft distribution device " that adopt promptly are provided with a cam more on the float chamber of the top of each cylinder, drive the import/exhaust door by tappet (or lower shake-changing arm), push rod, rocking arm, in order to the keying of control cylinder valve, use and realize distribution control.Fig. 1 illustrates two kinds of Single Over Head Camshaft distribution devices commonly used (identical label is represented identical parts among each figure of this specification) respectively with Fig. 2.
Fig. 2 illustrates the distribution device longitudinal sectional drawing (one of two valves only are shown among the figure) of another kind of Single Over Head Camshaft in the mode of signal, the surface of its cam 2 can contact with the upper surface of barrel-shaped pad 3, overcome the elastic force of valve spring 4, can realize driving valve 5.At present a lot of cars all adopt this distribution device, as by " the Audi car structure " the 34th page to the 37th page that China Machine Press publishes this report being arranged promptly in January, 1997.Adopt this distribution device, can only be applicable to that each cylinder has the motor of single intake valve and single exhaust valve.
Yet, facts have proved,, no matter its intake valve and exhaust valve are offset to separately a side of cylinder head for the cylinder that has only single intake valve and exhaust valve, also or with them place the middle part on cylinder top, all have air inlet or the uneven shortcoming of exhaust with regard to cross section in the cylinder.
The object of the present invention is to provide a kind of power performance that can improve distribution device, make even air inlet of cylinder and evenly exhaust, improve the two-top camshaft air distributor of ventilation quality.
For achieving the above object, the present invention proposes a kind of gear-driven two-top camshaft air distributor, comprise intake cam and exhaust cam, and the engaging gear that is fastenedly connected with intake cam and exhaust cam respectively, and intake cam contacts with the barrel-shaped pad outer surface of intake valve and exhaust valve respectively with exhaust cam, it is characterized in that, described intake cam and exhaust cam have two groups, be located at cylinder head center line both sides symmetrically side by side, each cam all coaxially disposes an engaging gear, and each cam is with coaxial engaging gear separately and is fastenedly connected.
Described intake cam contacts with the outer surface of barrel-shaped pad of corresponding intake valve or the barrel-shaped pad of exhaust valve respectively with exhaust cam, and the internal surface of each barrel-shaped pad contacts with corresponding intake valve or exhaust valve respectively.
The engaging gear of respectively organizing intake cam of a plurality of cylinders of motor and the engaging gear of respectively organizing exhaust cam are coaxially driven by separately motive power wheel respectively.
Adopt the distribution device of Dual Over Head Camshaft of the present invention, its compact structure, be convenient to realize making the work of many air gate distributions of cylinder, and can make import/exhaust Men Dougeng near the center, firing chamber, not only help improving the charging efficiency of volumetric efficiency and intake valve, and make the exhausted air quantity in the more smooth and easy and residual cylinder of exhaust minimum, thus can increase gas significantly by basal area, exhaust gas temperature is descended.In addition, adopt many air gate distributions, can reduce the size of single valve, thereby increase the rigidity of valve, can also improve the radiating condition of valve, the valve heat load is descended.In addition, use many valve mechanisms, gas is increased by section, can suitably reduce valve lift, help improving the power performance of distribution device.
The number of parts of two-top camshaft air distributor of the present invention is less, has reduced the inertial mass of movement parts, thereby improves the rigidity of movement parts, and the natural frequency of vibration of movement parts is improved.In addition, owing to make the characteristics of motion of valve motion rule and cam profile defined approaching, thereby can control valve timing exactly.
Below with reference to accompanying drawing crest places the cam of the present invention is described in further detail and joins a specific embodiment of mechanism of qi structure, wherein:
Fig. 1 is the cross-sectional configuration schematic representation of a kind of Single Over Head Camshaft distribution device of prior art;
Fig. 2 is the cross-sectional configuration schematic representation of the another kind of Single Over Head Camshaft distribution device of prior art;
Fig. 3 is the schematic representation that explanation two-top camshaft air distributor top view of the present invention is arranged;
Fig. 4 is the plan view of expression two-top camshaft air distributor of the present invention.
With reference to Fig. 3, a kind of top view structural configuration that adopts the four-cylinder motor petrol motor of two-top camshaft air distributor of the present invention shown in the figure.Along perpendicular to the direction on cylinder head surface, promptly observe along the longitudinal axis of cylinder 20, two groups of intake ducts 15,15 shown in the figure and air outlet flue 7,7, they are provided with about motor symmetry axis A-A line left and right symmetrically.With described intake duct 15,15 and air outlet flue 7,7 air inlet side cam 11,11 and exhaust side cams 2,2 are set respectively accordingly, and the air inlet side engaging gear 10,10 and the exhaust side engaging gear 1,1 of fastening configuration are correspondingly arranged.Air inlet side cam 11,11 and air inlet side engaging gear 10,10, and exhaust side cams 2,2 and exhaust side engaging gear 1,1 form two assembly mechanism of qi structures separately accordingly, the meshing zone of air inlet side engaging gear during number in the figure 19 places are every group 10 and exhaust side engaging gear 1.Air inlet side cam 11 and exhaust side cams 2 in each group contacts with 12 with pad 3 respectively; Air inlet side cam 11 in every group is mutually different with exhaust side cams 2 initial bit separately, can be according to actual working conditions such as the physical dimension of each associated components of cylinder and engine speed, and initial setting initial bit therebetween differs.
Also schematically illustrate among Fig. 3, as the air inlet side engaging gear 10 in every group in a plurality of cylinders of motor, 10 and air inlet side cam 11,11 and every group in exhaust side engaging gear 1,1 and exhaust side cams 2,2 respectively coaxial (shown in the dot and dash line among the figure 11 and 12), and drive by separately motive power wheel (not shown) respectively.
Fig. 4 represents the plan view of two-top camshaft air distributor of the present invention, and it illustrates the cross-sectional configuration layout of being got along B-B line among Fig. 3.The 78.8mm of cylinder bore Φ shown in this embodiment, cylinder spacing 88mm, piston stroke 69mm.Every cylinder adopts 4 air valve structures of two intake valves, two exhaust valves, drives intake valve 14 and exhaust valves 5 by air inlet side cam 11 and exhaust side cams 2 respectively, exhaust valve 5 long 88mm wherein, and bar is Φ 6mm directly, valve diameter of phi 25mm; Intake valve 14 long 88mm, bar footpath Φ 6mm, valve diameter of phi 31mm.The axle base 75mm at two cams 11 in every group and 2 work places, gear 10 and 1 engagement by a pair of 1.75 moduluses, 40 teeth drives respectively.The maximum lift 7.8mm of air inlet side cam 11, the maximum lift 8.1mm of exhaust side cams.
All the other labels 6 are cylinder head among each figure of this specification, and 8 is piston, and 9 is cylinder wall.
It will be apparent to those skilled in the art that and copy top embodiment, also can be designed to, and even 4 groups gear engagement drives many overhead camshafts distribution device, the multichannel distribution of realization petrol engine cylinder such as 3 groups.
Claims (6)
1. gear-driven two-top camshaft air distributor, comprise intake cam and exhaust cam, and the engaging gear that is fastenedly connected with intake cam and exhaust cam respectively, and intake cam contacts with the barrel-shaped pad outer surface of intake valve and exhaust valve respectively with exhaust cam, it is characterized in that, described intake cam and exhaust cam have two groups, be located at cylinder head center line both sides symmetrically side by side, each cam all coaxially disposes an engaging gear, and each cam is with coaxial engaging gear separately and is fastenedly connected; Air inlet side cam in each group in described two groups of cams is mutually different with exhaust side cams initial bit separately.
2. gear engagement as claimed in claim 1 drives the distribution device of Dual Over Head Camshaft, it is characterized in that described intake cam contacts with the outer surface of barrel-shaped pad of corresponding intake valve or the barrel-shaped pad of exhaust valve respectively with exhaust cam; The internal surface of each barrel-shaped pad contacts with corresponding intake valve or exhaust valve respectively.
3. gear engagement as claimed in claim 1 or 2 drives the distribution device of Dual Over Head Camshaft, it is characterized in that the engaging gear of respectively organizing intake cam of a plurality of cylinders of motor and the engaging gear of respectively organizing exhaust cam are coaxially driven by separately motive power wheel respectively.
4. gear engagement as claimed in claim 1 or 2 drives the distribution device of Dual Over Head Camshaft, it is characterized in that described intake cam and exhaust cam have two groups 3 groups.
5. gear engagement as claimed in claim 3 drives the distribution device of Dual Over Head Camshaft, it is characterized in that described intake cam and exhaust cam have two groups 3 groups.
6. gear engagement as claimed in claim 2 drives the distribution device of Dual Over Head Camshaft, it is characterized in that the maximum lift 7.8mm of described air inlet side cam 11, the maximum lift 8.1mm of exhaust side cams.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99126053 CN1252488A (en) | 1999-12-14 | 1999-12-14 | Gear-driven two-top camshaft air distributor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99126053 CN1252488A (en) | 1999-12-14 | 1999-12-14 | Gear-driven two-top camshaft air distributor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1252488A true CN1252488A (en) | 2000-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99126053 Pending CN1252488A (en) | 1999-12-14 | 1999-12-14 | Gear-driven two-top camshaft air distributor |
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| CN (1) | CN1252488A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002042584A1 (en) * | 2000-11-22 | 2002-05-30 | Xiao Ming Zhai | An intelligent lock that can set a key code by itself, a key which can be used for many locks and a setting tool thereof |
| CN102183368A (en) * | 2011-03-14 | 2011-09-14 | 重庆长安汽车股份有限公司 | Test bed for valve actuating mechanism of engine with top-mounted cam shafts |
-
1999
- 1999-12-14 CN CN 99126053 patent/CN1252488A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002042584A1 (en) * | 2000-11-22 | 2002-05-30 | Xiao Ming Zhai | An intelligent lock that can set a key code by itself, a key which can be used for many locks and a setting tool thereof |
| CN102183368A (en) * | 2011-03-14 | 2011-09-14 | 重庆长安汽车股份有限公司 | Test bed for valve actuating mechanism of engine with top-mounted cam shafts |
| CN102183368B (en) * | 2011-03-14 | 2013-03-06 | 重庆长安汽车股份有限公司 | Test bed for valve actuating mechanism of engine with top-mounted cam shafts |
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| WD01 | Invention patent application deemed withdrawn after publication |