CN217872963U - Engine and valve actuating mechanism thereof - Google Patents
Engine and valve actuating mechanism thereof Download PDFInfo
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- CN217872963U CN217872963U CN202221998286.3U CN202221998286U CN217872963U CN 217872963 U CN217872963 U CN 217872963U CN 202221998286 U CN202221998286 U CN 202221998286U CN 217872963 U CN217872963 U CN 217872963U
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- push rod
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Abstract
The utility model discloses an engine and a valve actuating mechanism thereof, wherein at least one cam is arranged on a cam shaft; the valve actuating mechanism also comprises at least one valve actuating structure, the valve actuating structure comprises a driven part, a tappet push rod group and a valve rocker arm group, and a roller tappet of the tappet push rod group is connected with a push rod; one end of the driven piece is arranged between the roller wheel and the cam, one side of the driven piece, which is close to the roller wheel, is provided with a curved surface track, the roller wheel acts on the curved surface track, and the other side of the driven piece acts on the cam; the other end of the push rod acts on the rocker arm; the engine valve actuating mechanism further comprises a timing adjusting structure, the timing adjusting structure comprises an eccentric shaft assembly, the eccentric shaft assembly comprises an installation shaft, at least one eccentric end is rotatably installed on the installation shaft, and the other end of the driven piece is connected to the eccentric end. The eccentric ends mounted on the mounting shaft rotate independently of each other to adjust the valve timing of the intake valve train and the exhaust valve train independently of each other.
Description
Technical Field
The utility model relates to an engine technology field especially relates to an engine and valve actuating mechanism thereof.
Background
The air distribution mechanism is a mechanism for controlling the opening and closing of air valves (air inlet valve and air outlet valve) in a timing way according to the requirements of the working cycle and the firing sequence of the engine, so that fresh air enters the cylinder in time, and waste gas is discharged in time.
Valve trains can be classified into non-variable valve trains and variable valve trains.
In the prior art, a variable valve train consists of a valve rocker arm set, a tappet push rod set and a variable mechanism set. The variable mechanism and the tappet push rod group transmit power through the driven part, an eccentric shaft of the variable mechanism is connected with one end of the driven part, and meanwhile, a roller of a roller tappet of the tappet push rod group acts on the other end of the driven part. The existing eccentric shaft is provided with an eccentric end which is fixedly connected with the eccentric shaft body, and the existing variable mechanism can only variably adjust an air inlet valve actuating mechanism or an air outlet valve actuating mechanism.
Disclosure of Invention
In order to overcome the defects, the utility model provides a first technical problem who solves provides an engine valve mechanism, can enough adjust the valve timing of admission valve mechanism, can adjust the valve timing of exhaust valve mechanism again to guarantee that the valve clearance is unchangeable at the in-process of valve timing adjustment.
In order to solve the technical problem, the engine valve actuating mechanism of the utility model comprises a camshaft, wherein at least one cam is arranged on the camshaft; the engine valve actuating mechanism also comprises at least one valve actuating structure, the valve actuating structure comprises a driven part and a tappet push rod group, the tappet push rod group comprises a roller tappet and a push rod, one end of the roller tappet is provided with a roller, and the other end of the roller tappet is mutually connected with one end of the push rod; one end of the driven piece is arranged between the roller and the cam, one side, close to the roller, of the driven piece is provided with a curved surface track, the roller acts on the curved surface track, and the other side of the driven piece acts on the cam; the gas distribution structure also comprises a valve rocker group, and the other end of the push rod acts on a rocker arm of the valve rocker group; the engine valve actuating mechanism further comprises a timing adjusting structure, the timing adjusting structure comprises an eccentric shaft assembly, the eccentric shaft assembly comprises an installation shaft, at least one eccentric end is rotatably installed on the installation shaft, and the other end of the driven piece is connected to the eccentric end.
Further, the eccentric end comprises an eccentric block, the eccentric block is rotatably mounted on the mounting shaft, and the driven member is rotatably mounted on the eccentric block.
Furthermore, a follow-up shaft is rotatably arranged on the eccentric block, and the driven piece is rotatably arranged on the follow-up shaft.
Furthermore, one end of the follow-up shaft is provided with a follow-up shaft limiting part.
Further, the other end of the follow-up shaft is provided with a follow-up shaft stop.
Further, the follow-up shaft stop part is a snap spring.
Further, the timing adjusting structure further comprises a power input shaft, and the eccentric block is connected to the power input shaft through a connecting assembly.
Further, coupling assembling includes connecting block and connecting rod, connecting block fixed connection in the power input shaft, the one end of connecting rod rotate connect in the connecting block, the other end of connecting rod rotate connect in eccentric block.
Further, the cam is provided with two, the eccentric block is provided with two, and the gas distribution structure is provided with two.
Based on a general utility model design, the utility model aims to solve the second technical problem that, an engine is provided, can enough adjust the valve timing of the valve actuating mechanism that admits air, can adjust the valve timing of exhaust valve actuating mechanism again to guarantee that the valve clearance is unchangeable at the in-process of valve timing adjustment.
An engine comprising an engine valve train as described above.
After the technical scheme is adopted, the utility model has the advantages that at least one cam is arranged on the cam shaft of the engine valve mechanism; the engine valve actuating mechanism also comprises at least one valve actuating structure, the valve actuating structure comprises a driven part and a tappet push rod group, the tappet push rod group comprises a roller tappet and a push rod, one end of the roller tappet is provided with a roller, and the other end of the roller tappet is mutually connected with one end of the push rod; one end of the driven piece is arranged between the roller and the cam, one side of the driven piece, which is close to the roller, is provided with a curved surface track, the roller acts on the curved surface track, and the other side of the driven piece acts on the cam; the air distribution structure also comprises an air valve rocker arm group, and the other end of the push rod acts on the rocker arm; the engine valve actuating mechanism further comprises a timing adjusting structure, the timing adjusting structure comprises an eccentric shaft assembly, the eccentric shaft assembly comprises an installation shaft, at least one eccentric end is rotatably installed on the installation shaft, and the other end of the driven piece is connected to the eccentric end. The eccentric ends arranged on the mounting shaft rotate independently, the valve timing of the air inlet valve actuating mechanism and the air outlet valve actuating mechanism can be adjusted independently, and the valve clearance is ensured to be unchanged in the valve timing adjusting process.
Drawings
Fig. 1 is a perspective view of an engine valve train of the present invention;
FIG. 2 is an enlarged perspective view of the timing adjustment structure (including the camshaft, the intake follower, and the exhaust follower) of FIG. 1;
FIG. 3 is an enlarged exploded view of the eccentric shaft assembly of FIG. 2;
FIG. 4 is an enlarged perspective view of the eccentric shaft assembly of FIG. 2;
in the figure: 1. a camshaft; 2. an intake valve rocker arm set; 21. an intake rocker arm; 3. an exhaust valve rocker arm set; 31. an exhaust rocker arm; 4. an air inlet push rod; 5. an exhaust push rod; 6. an air inlet roller tappet; 7. an exhaust roller tappet; 8. an intake follower; 9. an exhaust follower; 10. an air intake connecting rod; 11. an exhaust connecting rod; 12. an intake power input shaft; 13. an exhaust power input shaft; 14. an air inlet connecting block; 15. an exhaust connecting block; 16. an air intake worm gear structure; 17. an exhaust worm gear structure; 18. an eccentric shaft assembly; 181. installing a shaft; 182. an air inlet eccentric block; 183. an exhaust eccentric block; 184. an intake air follower shaft; 1841. a limiting part of the air inlet follow-up shaft; 185. an exhaust follower shaft; 1851. an exhaust follow-up shaft limiting part; 186. an intake follow shaft stop; 187. exhaust follows shaft stop.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
An engine comprises a body, and an engine valve mechanism is arranged on the body.
Referring to fig. 1, the valve train of the engine comprises a camshaft 1, and at least one cam is arranged on the camshaft 1; in this embodiment, the camshaft 1 is provided with two cams, which are an intake cam and an exhaust cam, respectively.
The engine valve actuating mechanism also comprises at least one valve actuating structure, and in the embodiment, two valve actuating structures are arranged, namely an air inlet valve actuating structure and an air outlet valve actuating structure.
The air inlet distribution structure comprises an air inlet driven part 8 and an air inlet tappet push rod group, the air inlet tappet push rod group comprises an air inlet roller tappet 6 and an air inlet push rod 4, one end of the air inlet roller tappet 6 is provided with a roller, and the other end of the air inlet roller tappet 6 is mutually connected with one end of the air inlet push rod 4; one end of the air inlet driven piece 8 is arranged between the roller and the air inlet cam, one side, close to the roller, of the air inlet driven piece 8 is provided with a curved surface track, the roller acts on the curved surface track, and the other side of the air inlet driven piece 8 acts on the air inlet cam; the air inlet and distribution structure further comprises an air inlet valve rocker arm group 2, and the other end of the air inlet push rod 4 acts on an air inlet rocker arm 21 of the air inlet valve rocker arm group 2.
The exhaust gas distribution structure comprises an exhaust driven part 9 and an exhaust tappet push rod group, the exhaust tappet push rod group comprises an exhaust roller tappet 7 and an exhaust push rod 5, one end of the exhaust roller tappet 7 is provided with a roller, and the other end of the exhaust roller tappet 7 is mutually connected with one end of the exhaust push rod 5; one end of the exhaust follower 9 is arranged between the roller and the exhaust cam, one side of the exhaust follower 9 close to the roller is provided with a curved track, the roller acts on the curved track, and the other side of the exhaust follower 9 acts on the exhaust cam; the exhaust valve distribution structure further comprises an exhaust valve rocker arm group 3, and the other end of an exhaust push rod 5 acts on an exhaust rocker arm 31 of the exhaust valve rocker arm group 3.
As shown together with fig. 1 and fig. 2, the engine valve train further includes a timing adjusting structure, the timing adjusting structure includes an eccentric shaft assembly 18, the eccentric shaft assembly 18 includes a mounting shaft 181, and the mounting shaft 181 is fixedly mounted on the engine body. At least one eccentric end is rotatably mounted on the mounting shaft 181, in this embodiment, two eccentric ends are provided, namely an intake eccentric end and an exhaust eccentric end, the other end of the intake driven member 8 is connected to the intake eccentric end, and the other end of the exhaust driven member 9 is connected to the exhaust eccentric end.
As shown in fig. 1, 2, 3 and 4, preferably, the intake eccentric end includes an intake eccentric block 182, the intake eccentric block 182 is rotatably mounted on the mounting shaft 181, and the intake follower 8 is rotatably mounted on the intake eccentric block 182.
Preferably, an intake follower shaft 184 is rotatably provided on the intake eccentric mass 182, and the intake follower 8 is rotatably mounted on the intake follower shaft 184.
In order to prevent the intake follower shaft 184 from axially shifting, an intake follower shaft stopper 1841 is provided at one end of the intake follower shaft 184, and an intake follower shaft stopper 186 is provided at the other end of the intake follower shaft 184. The intake follow shaft stop 186 is preferably a circlip.
Preferably, the exhaust eccentric end includes an exhaust eccentric block 183, the exhaust eccentric block 183 is rotatably mounted on the mounting shaft 181, and the exhaust follower 9 is rotatably mounted on the exhaust eccentric block 183.
Preferably, an exhaust follower shaft 185 is rotatably provided on the exhaust eccentric block 183, and the exhaust follower 9 is rotatably mounted on the exhaust follower shaft 185.
In order to prevent the exhaust follower shaft 185 from moving axially, an exhaust follower shaft stopper 1851 is provided at one end of the exhaust follower shaft 185, and an exhaust follower shaft stopper 187 is provided at the other end of the exhaust follower shaft 185. The exhaust follower shaft stopper 187 is preferably a circlip.
The timing adjusting structure further comprises two power input shafts, in the embodiment, the two power input shafts are respectively an air inlet power input shaft 12 and an air outlet power input shaft 13, and the air inlet power input shaft 12 and the air outlet power input shaft 13 are rotatably installed on the machine body. The air inlet power source inputs power through the air inlet power input shaft 12 to provide power for adjusting the valve timing of the air inlet valve mechanism. The intake power source is preferably an intake motor (not shown in the figure) and an intake worm gear 16 driven by the intake motor, and the intake motor drives the intake worm gear 16 and transmits power to the intake power input shaft 12, which belongs to the common knowledge of the skilled person and will not be described in detail herein. Step motor or servo motor etc. can be chooseed for use to the air inlet motor, through step motor or servo motor etc. accurate control air inlet worm gear structure 16's turned angle to reach the angle of adjustment of accurate control air inlet phase place, simultaneously, air inlet worm gear structure 16 is from locking-type drive mechanism, and the position can not change after the location, has realized accurate location.
The intake eccentric mass 182 is connected to the intake power input shaft 12 by an intake connection assembly. Preferably, the air inlet connection assembly comprises an air inlet connection block 14 and an air inlet connection rod 10, wherein the air inlet connection block 14 is fixedly connected to the air inlet power input shaft 12, one end of the air inlet connection rod 10 is rotatably connected to the air inlet connection block 14, and the other end of the air inlet connection rod 10 is rotatably connected to the air inlet eccentric block 182.
The exhaust power source inputs power through an exhaust power input shaft 13 to provide power for adjusting the valve timing of the exhaust valve mechanism. The exhaust power source is preferably an exhaust motor (not shown in the figure) and an exhaust worm gear structure 17 driven by the exhaust motor, and the exhaust motor drives the exhaust worm gear structure 17 and transmits power to the exhaust power input shaft 13, which belongs to common knowledge for those skilled in the art and will not be described in detail herein. Step motor or servo motor etc. can be chooseed for use to the exhaust motor, through step motor or servo motor etc. accurate control exhaust worm gear structure 17's turned angle to reach the angle of adjustment of accurate control exhaust phase place, simultaneously, exhaust worm gear structure 17 is from locking-type drive mechanism, and the position can not change after the location, has realized accurate location.
The exhaust eccentric block 183 is connected to the exhaust power input shaft 13 through an exhaust connection assembly. Preferably, the exhaust connection assembly comprises an exhaust connection block 15 and an exhaust connection rod 11, the exhaust connection block 15 is fixedly connected to the exhaust power input shaft 13, one end of the exhaust connection rod 11 is rotatably connected to the exhaust connection block 15, and the other end of the exhaust connection rod 11 is rotatably connected to the exhaust eccentric block 183.
Since the intake eccentric mass 182 and the exhaust eccentric mass 183 are rotatably mounted on the mounting shaft 181 independently of each other, and the intake eccentric mass 182 and the exhaust eccentric mass 183 are driven by independent power sources to move, the timing adjustment structure can adjust the valve timing of both the intake valve train and the exhaust valve train.
When the timing of the air intake and distribution mechanism is adjusted, the air intake motor drives the air intake worm and gear structure 16 to work, the air intake power input shaft 12 rotates under the driving of the air intake worm and gear structure 16, the power is transmitted through the air intake connecting block 14 and the air intake connecting rod 10, the air intake eccentric block 182 rotates by taking the central axis of the mounting shaft 181 as the center, and the air intake driven part 8 is driven to move on the surface of the air intake cam to realize the adjustment of the air intake timing.
Similarly, when the timing of the exhaust valve timing mechanism is adjusted, the exhaust motor drives the exhaust worm gear 17 to operate, the exhaust power input shaft 13 is driven by the exhaust worm gear 17 to rotate, the exhaust eccentric block 183 rotates around the central axis of the mounting shaft 181 through power transmission of the exhaust connecting block 15 and the exhaust connecting rod 11, and the exhaust driven member 9 is driven to move on the exhaust cam surface to adjust the exhaust timing.
In the description of the present specification, it should be understood that the orientations or positional relationships described by the "one end", "the other end", and the like are based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes without creative work from the above conception, which falls within the protection scope of the present invention.
Claims (10)
1. A valve train of an engine comprises a camshaft, wherein at least one cam is arranged on the camshaft;
the engine valve actuating mechanism also comprises at least one valve actuating structure, the valve actuating structure comprises a driven part and a tappet push rod group, the tappet push rod group comprises a roller tappet and a push rod, one end of the roller tappet is provided with a roller, and the other end of the roller tappet is mutually connected with one end of the push rod; one end of the driven piece is arranged between the roller and the cam, one side, close to the roller, of the driven piece is provided with a curved surface track, the roller acts on the curved surface track, and the other side of the driven piece acts on the cam; the valve distribution structure also comprises an air valve rocker arm set, and the other end of the push rod acts on a rocker arm of the air valve rocker arm set; it is characterized in that the preparation method is characterized in that,
the engine valve actuating mechanism further comprises a timing adjusting structure, the timing adjusting structure comprises an eccentric shaft assembly, the eccentric shaft assembly comprises an installation shaft, at least one eccentric end is rotatably installed on the installation shaft, and the other end of the driven piece is connected to the eccentric end.
2. The engine valve train of claim 1 wherein the eccentric end comprises an eccentric mass that is rotatably mounted to the mounting shaft and the follower is rotatably mounted to the eccentric mass.
3. An engine valve train according to claim 2 wherein the eccentric mass is rotatably provided with a follower shaft, the follower member being rotatably mounted on the follower shaft.
4. An engine valve gear according to claim 3 wherein one end of the follower shaft is provided with a follower shaft stopper.
5. An engine valve train according to claim 4 wherein the other end of the follower shaft is provided with a follower shaft stop.
6. An engine valve train according to claim 5 wherein the follower shaft stop is a circlip.
7. The engine valve train of claim 2 wherein the timing adjustment arrangement further comprises a power input shaft, the eccentric mass being connected to the power input shaft by a connecting assembly.
8. The engine valve train of claim 7 wherein the coupling assembly comprises a connecting block fixedly attached to the power input shaft and a connecting rod having one end pivotally attached to the connecting block and the other end pivotally attached to the eccentric mass.
9. The engine valve train of claim 2 wherein there are two cams, two eccentric masses and two valve trains.
10. An engine comprising an engine valve train according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221998286.3U CN217872963U (en) | 2022-07-13 | 2022-07-13 | Engine and valve actuating mechanism thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221998286.3U CN217872963U (en) | 2022-07-13 | 2022-07-13 | Engine and valve actuating mechanism thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217872963U true CN217872963U (en) | 2022-11-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221998286.3U Active CN217872963U (en) | 2022-07-13 | 2022-07-13 | Engine and valve actuating mechanism thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217872963U (en) |
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2022
- 2022-07-13 CN CN202221998286.3U patent/CN217872963U/en active Active
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