CN101666251A - Exhaust cam shaft structure - Google Patents
Exhaust cam shaft structure Download PDFInfo
- Publication number
- CN101666251A CN101666251A CN200810070237A CN200810070237A CN101666251A CN 101666251 A CN101666251 A CN 101666251A CN 200810070237 A CN200810070237 A CN 200810070237A CN 200810070237 A CN200810070237 A CN 200810070237A CN 101666251 A CN101666251 A CN 101666251A
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- China
- Prior art keywords
- exhaust cam
- cam shaft
- lug boss
- exhaust
- axle journal
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Abstract
The invention discloses an exhaust cam shaft of an automobile engine. The front end of a cam shaft (1) is provided with a limit lug boss (2); four pairs of cams which are first exhaust cams (4), second exhaust cams (5), third exhaust cams (6) and fourth exhaust cams (7) respectively are distributed on a shaft body of the cam shaft (1) from the front to back; the rear side of the limit lug boss (2)is provided with a circle of convex ribs (8), and an annular clamping groove (9) is formed between the convex ribs (8) and the limit lug boss (2); the rear end of the cam shaft (1) is provided with ashaft neck (3) which forms an annular lug boss, and the diameter of the annular lug boss is larger than the diameter of the shaft body of the cam shaft (1). On the premise of not changing the structure of a cylinder cover, the exhaust cam shaft of the automobile engine can adapt to the installation of a VVT mechanism, and has the characteristics of skillful design, simple structure, easy implementation, low reforming cost and the like.
Description
Technical field
The present invention relates to a kind of motor car engine member, relate in particular to the exhaust cam shaft on the motor car engine.
Background technique
At present, the structure of automobile engine to exhaust camshaft as shown in Figure 4, front end at camshaft 1 is provided with positive stop lug boss 2 and axle journal 3, be provided with draw-in groove 9 between positive stop lug boss 2 and the axle journal 3, the rear end of camshaft 1 forms the step section, be distributed with four pairs of cams on the axle body between axle journal 3 and the step section from front to back, be respectively first exhaust cam 4, second exhaust cam 5, the 3rd exhaust cam 6 and the 4th exhaust cam 7.During assembling, exhaust cam shaft 1 is supported on the cylinder cap by the draw-in groove 9 of its front end and the step section of rear end, the driving gear of installing on the axle journal 3 is meshed with the driven gear teeth on the admission cam shaft, and exhaust cam shaft 1 also is connected with bent axle by belt and belt pulley, the acting of gas fuel burning in the cylinder promotes reciprocating motion of the pistons like this, piston drives crankshaft rotating by connecting rod, bent axle is in outputting power, driving exhaust cam shaft by belt rotates, exhaust cam shaft is again by the rotation of gear driven admission cam shaft, advance, in the time of the exhaust cam shaft rotation, the cam unseat the valve on the axle body carries out air inlet or exhaust separately.
In order to improve power character, the fuel economy of motor in all speed range, reduce the discharging of tail gas, each automobile production producer is all in the optimization of making great efforts research camshaft degree valve timing." VVT " is the english abbreviation of variable valve timing system of engine, and this system can regulate engine timing continuously.When motor by low speed during to high-speed transitions, electronic computer is automatically pressed to machine oil the little turbine in the intake cam shaftgear, under the effect of pressure, little turbine just can rotate to an angle with respect to gear hub, thereby make admission cam shaft rotation forward or backward in certain scope, to change the moment of IO Intake Valve Opens, reach continuous purpose of regulating valve timing.The producer that has is installed in vvt mechanism the front end of admission cam shaft, abut against the next door of driven gear, because the space of cylinder cap front portion is limited, though this mounting type is less to the change of inlet and outlet cam, but the change to the cylinder cap structure is bigger, reforming cost is quite high, and the redundant space at cylinder cap rear portion is not utilized effectively.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of automobile engine to exhaust camshaft that vvt mechanism is installed that adapts under the prerequisite that does not change the cylinder cap structure.
Technological scheme of the present invention is as follows: a kind of automobile engine to exhaust camshaft, on the axle body of camshaft, be distributed with four pairs of cams from front to back, be respectively first exhaust cam, second exhaust cam, the 3rd exhaust cam and the 4th exhaust cam, the front end of camshaft is provided with positive stop lug boss, rear side at positive stop lug boss is provided with a circle fin, forms annular slot between this fin and the positive stop lug boss; Rear end at described camshaft is provided with axle journal, and this axle journal forms annular boss, and the diameter of annular boss is greater than the diameter of camshaft axle body.
The present invention changes axle journal into be arranged on exhaust cam shaft rear end by the front end that is positioned at exhaust cam shaft in the conventional construction, and exhaust cam shaft is supported on the cylinder cap by the annular slot of its front end and the axle body at rear portion.Suit driving gear on the axle journal of exhaust cam shaft rear end, the axle journal of admission cam shaft and the driven gear that is installed on it are correspondingly adjusted to the rear end, vvt mechanism also can be installed in the rear end of admission cam shaft like this, the redundant space at cylinder cap rear portion just in time can ccontaining vvt mechanism.This shows that the present invention is under the prerequisite that does not change the cylinder cap structure, the structure that only needs to adjust the inlet and outlet camshaft just can adapt to the vvt mechanism installation, and reforming cost is lower, and implements to be very easy to.
Radially offer pin-and-hole on the outer peripheral surface of above-mentioned axle journal, locating stud passes driving gear and stretches in this pin-and-hole, can be circumferentially spacing to driving gear, and to prevent that driving gear from coming off and to rotate with respect to exhaust cam shaft.
Front end at above-mentioned axle journal is provided with the annular small boss of a circle, offers annular shallow slot on the outer peripheral surface of axle journal rear end, and collar is installed in the annular shallow slot, and collar cooperates with small boss, and is axially spacing to driving gear, comes off to prevent driving gear.
Above-mentioned each exhaust cam is stepped shape, and the thickness of each exhaust cam flange end is greater than the thickness of basic circle end.Above structure guarantee exhaust cam flange end intensity and with valve between contact area in, can effectively save material, reduce cost of material, and alleviate the weight and the rotary inertia of exhaust cam shaft, make the exhaust cam shaft rotational resistance littler, effective merit volume of output is more.
Beneficial effect: the present invention can adapt to vvt mechanism and install under the prerequisite that does not change the cylinder cap structure, have be skillfully constructed, simple in structure, implement easily, characteristics such as reforming cost is low.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 is installed in phase diagram on the cylinder cap for the present invention.
Fig. 4 is the structural representation of background technique.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
As Fig. 1, shown in Figure 3, front end at exhaust cam shaft 1 is formed with annular stop boss 2 and fin 8, fin 8 is positioned at the rear side of positive stop lug boss 2, both diameters are equal substantially, and be provided with annular slot 9 between fin 8 and the positive stop lug boss 2, exhaust cam shaft 1 is supported on the cylinder cap 13 by the annular slot 9 of its front end and the axle body at rear portion.Be provided with the axle journal of installing for driving gear 15 3 in the rear end of described camshaft 1, this axle journal 3 forms annular boss, and the diameter of annular boss is greater than the diameter of camshaft 1 axle body.Radially offer pin-and-hole 10 on the outer peripheral surface of axle journal 3, locating stud passes driving gear 15 and stretches in this pin-and-hole 10, can be circumferentially spacing to driving gear 15, and to prevent that driving gear 15 from coming off and to rotate with respect to exhaust cam shaft 1.The front end of described axle journal 3 is provided with the annular small boss 11 of a circle, offers annular shallow slot 12 on the outer peripheral surface of axle journal 3 rear ends, in the annular shallow slot 12 collar can be installed, and collar cooperates with small boss 11, to driving gear 15 axial limitings, comes off to prevent driving gear 15.
As shown in Figure 1 and Figure 2, camshaft 1 is distributed with four pairs of cams from front to back on the axle body between fin 8 and the axle journal 3, be respectively first exhaust cam 4, second exhaust cam 5, the 3rd exhaust cam 6 and the 4th exhaust cam 7, these four pairs of exhaust cam flanges towards having nothing in common with each other, and each exhaust cam 4,5,6,7 is stepped shape, and the thickness of each exhaust cam flange end is greater than the thickness of basic circle end.Like this guarantee exhaust cam flange end intensity and with valve between contact area in, can effectively save material, reduce cost of material, and alleviate the weight and the rotary inertia of exhaust cam shaft, make the exhaust cam shaft rotational resistance littler, effective merit volume of output is more.
From Fig. 3 further as can be known, the axle journal 16 of admission cam shaft 14 and the driven gear 17 that is installed on it are correspondingly adjusted to the rear end, vvt mechanism 18 also can be installed in the rear end of admission cam shaft like this, the redundant space at cylinder cap 13 rear portions just in time can be ccontaining VVT18 mechanism, driving gear 15 and driven gear 17.This shows that the present invention is under the prerequisite that does not change the cylinder cap structure, the structure that only needs to adjust the inlet and outlet camshaft just can adapt to the vvt mechanism installation, and reforming cost is lower, and implements to be very easy to.
Claims (4)
1, a kind of exhaust cam shaft structure, front end at camshaft (1) is provided with positive stop lug boss (2), be distributed with four pairs of cams on the axle body of camshaft (1) from front to back, be respectively first exhaust cam (4), second exhaust cam (5), the 3rd exhaust cam (6) and the 4th exhaust cam (7), it is characterized in that: the rear side at described positive stop lug boss (2) is provided with a circle fin (8), forms annular slot (9) between this fin (8) and the positive stop lug boss (2); Be provided with axle journal (3) in the rear end of described camshaft (1), this axle journal (3) forms annular boss, and the diameter of annular boss is greater than the diameter of camshaft (1) axle body.
2, a kind of exhaust cam shaft structure according to claim 1 is characterized in that: radially offer pin-and-hole (10) on the outer peripheral surface of described axle journal (3).
3, a kind of exhaust cam shaft structure according to claim 1 and 2 is characterized in that: the front end at described axle journal (3) is provided with a circle annular small boss (11), offers annular shallow slot (12) on the outer peripheral surface of axle journal (3) rear end.
4, a kind of exhaust cam shaft structure according to claim 1 is characterized in that: described each exhaust cam (4,5,6,7) is stepped shape, and the thickness of each exhaust cam flange end is greater than the thickness of basic circle end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810070237A CN101666251A (en) | 2008-09-05 | 2008-09-05 | Exhaust cam shaft structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810070237A CN101666251A (en) | 2008-09-05 | 2008-09-05 | Exhaust cam shaft structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101666251A true CN101666251A (en) | 2010-03-10 |
Family
ID=41803012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810070237A Pending CN101666251A (en) | 2008-09-05 | 2008-09-05 | Exhaust cam shaft structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101666251A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871376A (en) * | 2010-06-01 | 2010-10-27 | 奇瑞汽车股份有限公司 | Automobile engine camshaft and processing method thereof |
| CN106121757A (en) * | 2016-08-17 | 2016-11-16 | 力帆实业(集团)股份有限公司 | Admission cam shaft of car engine |
-
2008
- 2008-09-05 CN CN200810070237A patent/CN101666251A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871376A (en) * | 2010-06-01 | 2010-10-27 | 奇瑞汽车股份有限公司 | Automobile engine camshaft and processing method thereof |
| CN106121757A (en) * | 2016-08-17 | 2016-11-16 | 力帆实业(集团)股份有限公司 | Admission cam shaft of car engine |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100310 |