STRUCTURE OF DRIVING MEMBER OF ENGINE VALVE
An engine includes a camshaft carrying a first intake cam, a second intake cam, and an exhaust cam for selectively driving an intake valve driving member and an exhaust valve driving member, which in turn drive an intake valve and an exhaust valve. The intake valve driving member includes first and second driving members, which form push rollers respectively in engagement with the first and second intake cams and a pressing section in engagement with the intake valve. The first and second driving members form bores communicating each other to form a hydraulic cylinder. First and second pistons are movable within the bores to selectively set the first and second driving members in a condition of being allowed to operate independently or in combination with each other.
The present invention generally relates to a driving member of valve of engine, and more particularly to a structure of valve driving member of engine that simplifies engineering of variable lift of an engine valve.
DESCRIPTION OF THE PRIOR ARTThe conventional structure of valve variable-lift mechanism for the engine 1 described above uses the first and second driving members 21, 22 arranged above the engine valve 2 to individually drive the engine valve 2. Although this is effective to realize switching of intake and exhaust valves for different lifts of engine valve 2 according to the rotational speeds of the engine 1, yet the second driving member 22 is of a multiple-link assembly, which is complicated in structure and requires quite an amount of space for operation. Thus, the cylinder head 1a of the engine 1 must be enlarged in order to provide a sufficient amount of space for the operation of the second driving member 22. Enlarging the cylinder head 1a of the engine 1 will certainly increase the cost of the engine 1 and also increase complication of engineering for the engine 1. For a motorcycle or scooter, the amount of space provided for accommodating an engine 1 is very limited. Thus, it is desired to provide a structure-simplified valve variable-lift mechanism for engines and this is a major challenge of the motorcycle/scooter industry.
SUMMARY OF THE INVENTIONThe primary objective of the present invention is to provide a structure of driving member of valve of engine, wherein the engine comprises a crankcase, a cylinder block mounted on the crankcase, and a cylinder head mounted on the cylinder block. The cylinder head comprises an intake port and an intake valve and an exhaust port and an exhaust valve, and an oil control valve. A camshaft seat is arranged between the intake valve and the exhaust valve. The camshaft seat comprises a camshaft that is driven by a timing chain. The camshaft comprises a first intake cam, a second intake cam, and an exhaust cam mounted thereto. Through the first intake cam, the second intake cam, and the exhaust cam, the camshaft, when put in rotation, drives an intake valve driving member or an exhaust valve driving member, and further, through the intake valve driving member or the exhaust valve driving member, the intake valve or the exhaust valve is caused to take a lift for intake or exhaust operation. The intake valve driving member comprises a first driving member and a second driving member. The first driving member forms a positioning hole, a bore, and a push roller and the second driving member forms a positioning hole, a bore, a push roller, and a pressing section. The push roller of the first driving member is in engagement with the first intake cam and the push roller of the second driving member is in engagement with the second intake cam. Further, the pressing section of the second driving member is in engagement with the intake valve. The bore of the first driving member and the bore of the second driving member are in communication with each other to form a hydraulic cylinder. The hydraulic cylinder has two ends respectively closed by closure caps. The hydraulic cylinder receives therein a spring and first and second pistons. As such, the first driving member and the second driving member can be selectively driven to operate independent of each other or in combination with each other to vary the lift of an engine intake valve thereby simplifying the engineering of variable lift for engine intake vale.
Another objective of the present invention is to provide a structure of driving member of valve of engine, wherein a position-constraining mechanism is arranged above the cylinder head and the position-constraining mechanism comprises a position-constraining rod, a spring, and a pressure relief hole, whereby with the position-constraining mechanism being in pushing engagement with the first driving member and the second driving member the positioning bar, it is ensured that the bores of the first and second driving members can be set at predetermined locations.
A further objective of the present invention is to provide a structure of driving member of valve of engine, wherein the first driving member and the second driving member comprise positioning bars that are located between the positioning holes and the pressing section and the bores of the first and second driving members are located between the push rollers and the positioning holes and located above a center-connection line connecting between centers of the push rollers and the positioning holes whereby the overall height of the cylinder head is effectively reduced.
The foregoing objectives and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.
Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
The following descriptions are exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.
Referring to
The crankcase 31 comprises a crankshaft (not shown) arranged therein. The crankcase 31 comprises an oil pump 311 arranged therein. The oil pump 311 pumps oil to a primary oil supply passage 312. The primary oil supply passage 312 extends from the crankcase 31 through the cylinder block 32 to communicate an oil control valve 4 that is mounted to the cylinder head 33.
The cylinder block 32 is mounted on the crankcase 31 and receives a timing chain 5 to extend therethrough. The cylinder block 32 comprises a timing chain tensioner 51 that is arranged at a side corresponding to an intake port 331 of the cylinder head 33.
The cylinder head 33 comprises the intake port 331 that is arranged at an intake side and an intake valve 332 and an exhaust port 333 that is arranged at an exhaust side and an exhaust valve 334. Referring to
To practice the present invention, as shown in
Efficacies of the present invention are that the camshaft 336 is provided with the first intake cam 3361, the second intake cam 3362, and the exhaust cam 3363, and the intake valve driving member 6 comprises the first driving member 61 and the second driving member 62, and further, the bore 613 of the first driving member 61 and the bore 623 of the second driving member 62 are in communication with each other to form the hydraulic cylinder 64, with the spring 642 and the first piston 643 and the second piston 644 that are movable hydraulically and by the spring 642 being contained within the hydraulic cylinder 64, the first driving member 61 and the second driving member 62 are selectively rotatable independent of each other or in combination with each other to vary lift stroke of the intake valve 332 of the engine 3, and thus simplifying engineering of variable lift for the engine valve 332 of the engine 3. Further, with the positioning bars 612, 622 of the first driving member 61 and the second driving member 62 located between the positioning holes 611, 621 and the pressing section 625 and with the bores 613, 623 of the first driving member 61 and the second driving member 62 located between the push rollers 613, 6232 and the positioning holes 611, 621 and located above the center-connection line A connecting between centers of the push rollers 614, 624 and the positioning holes 611, 621, the overall height of the cylinder head 33 is effectively reduced.
It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.
While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.
Claims
1. A driving member of valve of engine, the engine comprising a crankcase, a cylinder block mounted on the crankcase, and a cylinder head mounted on the cylinder block, the cylinder head comprising an intake port and an intake valve and an exhaust port and an exhaust valve, a camshaft seat being arranged between the intake valve and the exhaust valve, the camshaft seat comprising a camshaft that is driven by a timing chain, the camshaft comprising a first intake cam, a second intake cam, and an exhaust cam mounted thereto, whereby through the first intake cam, the second intake cam, and the exhaust cam, the camshaft, when put in rotation, drives an intake valve driving member or an exhaust valve driving member, and further, through the intake valve driving member or the exhaust valve driving member, the intake valve or the exhaust valve is caused to operate, characterized in that the intake valve driving member comprises a first driving member and a second driving member, the first driving member forming a positioning hole, a bore, and a push roller, the second driving member forming a positioning hole, a bore, a push roller, and a pressing section, the positioning holes of the first driving member and the second driving member receiving extension of a shaft rod therethrough, the push roller of the first driving member being in engagement with the first intake cam, the push roller of the second driving member being in engagement with the second intake cam, the pressing section of the second driving member being in engagement with the intake valve, the bore of the first driving member and the bore of the second driving member being in communication with each other to form a hydraulic cylinder, whereby the hydraulic cylinder allows the first driving member and the second driving member to operate independent of each other in a low lift opening condition of the intake valve and allows the first driving member and the second driving member to operatively connect to each other in a high lift opening condition of the intake valve.
2. The valve driving member of engine according to claim 1, wherein the cylinder head comprises an oil control valve.
3. The valve driving member of engine according to claim 1, wherein the cylinder head comprises a position-constraining mechanism in pushing engagement with the first driving member and the second driving member, the position-constraining mechanism comprising a position-constraining rod, a spring, and a pressure relief hole.
4. The valve driving member of engine according to claim 3, wherein the first driving member and the second driving member comprise positioning bars, the positioning bars being in pushing engagement with the position-constraining rod of the position-constraining mechanism.
5. The valve driving member of engine according to claim 4, wherein the positioning bars of the first driving member and the second driving member are located between the positioning holes and the pressing section.
6. The valve driving member of engine according to claim 1, wherein the bores of the first driving member and the second driving member are located between the push rollers and the positioning holes and are located above a center-connection line connecting between centers of the push rollers and the positioning holes.
7. The valve driving member of engine according to claim 1, wherein the first driving member and the second driving member are formed integrally.
8. The valve driving member of engine according to claim 4, wherein the first driving member and the second driving member are formed integrally.
9. The valve driving member of engine according to claim 6, wherein the first driving member and the second driving member are formed integrally.
10. The valve driving member of engine according to claim 1, wherein the pressing section comprises a gap adjusting member.
11. The valve driving member of engine according to claim 5, wherein the pressing section comprises a gap adjusting member.
12. The valve driving member of engine according to claim 1, wherein the hydraulic cylinder has two ends respectively closed by closure caps and receives therein a spring, the first piston, and the second piston.
13. The valve driving member of engine according to claim 12, wherein the first piston forms a first recess and a second recess.
14. The valve driving member of engine according to claim 13, wherein the closure caps form projecting pegs projecting inward of the hydraulic cylinder.
Type: Application
Filed: May 23, 2011
Publication Date: Dec 15, 2011
Inventors: JUNG-FENG TING (Kaohsiung City), Yeu-Jou Lin (Hsinchu City)
Application Number: 13/113,079
International Classification: F01L 1/34 (20060101);