Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1996-02-05
1997-10-28
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9027, 123 9036, 1231933, 123 9022, F01L 126
Patent
active
056808356
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
This invention relates to a rocker for actuating at least two lifting valves of an internal-combustion engine with three arms which can be swivelled separately about a common rocker axis and which each have a contact surface for a cam and can be connected by bolt elements which can be hydraulically displaced essentially in parallel to the rocker axis, in the two outer arms, one coupling bolt respectively being provided which can be acted upon hydraulically in a separate manner and to which, in each case, a spring-loaded restoring bolt is assigned which is arranged in the central arm.
From European Patent Document EP 0 259 106 A1, such a rocker is known by means of which the lifting valves of an internal-combustion engine cylinder by switching over the bolt elements can be actuated by several cams. It is an object of the invention to provide additional improvements for such a rocker.
This object has been achieved according to the present invention by forming a preassembly unit from the rocker arms, a rocker shaft piece, and two supporting brackets for the rocker shaft piece, and by guiding the hydraulic ducts by way of the supporting brackets and the rocker shaft piece through the outer arms for supplying the coupling bolts.
According to an advantageous further development, the contact surface of the central arm may be constructed as a rotatable roller in which the spring-loaded restoring bolts are arranged. In addition, the cam contact surfaces of the outer arms may be constructed as sliding pads.
This as well as other advantages and characteristics which may be significant with respect to the invention are explained by means of a preferred embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a rocker according to a preferred embodiment of the invention;
FIG. 2 is a sectional view similar to FIG. 1;
FIG. 3 is a view of this rocker according to the invention with the supporting brackets;
FIG. 4 is a sectional view similar to FIG. 1 including the supporting brackets in a plane representation;
FIG. 5 is the sectional view A--A of FIG. 4;
FIG. 6 is the sectional view B--B of FIG. 4;
FIG. 7a is a perspective view from above;
FIG. 7b is a perspective view from below of another rocker assembly which, additionally, has coil spring elements; and
FIGS. 8a, 8b are views of a similar rocker assembly with coil spring elements arranged in a different manner.
DETAILED DESCRIPTION OF THE DRAWINGS
Three arms 1, 2, 3 of a rocker or of a rocker assembly, which are disposed next to one another and can be swivelled about a common axis, actuate two lifting valves of an internal-combustion engine, which are not shown. As known, these lifting valves are supported by means of their shaft ends on hydraulic-play-compensating elements 5 which are inserted into corresponding receiving devices 1', 3' on the free ends of the two outer arms 1, 3.
Each arm of the rocker assembly has a contact surface 11, 12, 13 for a cam, which is not shown, of a camshaft, which is also not shown. In this case, the contact surfaces 11, 13 of the outer arms 1, 3 are constructed as sliding pads, while the contact surface 12 of the central arm is constructed as a roller which can be rotated about a secondary axis 6. If the individual arms 1, 2, 3 are separated from one another, that is, can be swivelled independently of one another about the rocker axis 4, as a result of the rolling movement of the cams on the contact surfaces 11, 12, 13, all arms 1, 2, 3 are swivelled corresponding to the respective cam contour so that, in this case, the respective lifting valve assigned to the arms 1, 3 is actuated corresponding to the respective cam contour.
However, it is also possible to connect the arm 2 with the arm 1 and/or the arm 3, that is, to couple the arms 2 and 1 and/or the arms 2 and 3 to one another in such a manner that, during a swivel movement of arm 2, arm 1 and/or arm 3 is also taken along. If then the travel course of the cam rolling on the contact surface/roller 12 overlaps the tr
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Patent Abstracts of Japan, vol. 11, No. 10 (M-552) (2547) 10 Jan. 1987 JP, A, 61-185,605 (Suzuki) 19 Aug. 1986.
Hoyer Uwe
Ruffing Wolfgang
Bayerische Motoren Werke Aktiengesellschaft
Lo Weilun
LandOfFree
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