Machine element or mechanism – Control lever and linkage systems – Elements
Patent
1983-02-25
1986-12-16
Weakley, Harold W.
Machine element or mechanism
Control lever and linkage systems
Elements
74519, 74571M, 123 9042, 123 9045, G05G 110
Patent
active
046287620
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a valve-actuating lever for an internal combustion engine having a separate valve clearance adjusting element attached to the actuating lever at one end portion thereof and in alignment with the central longitudinal plane of the lever. The lever having the one end portion offset from its central longitudinal plane with the adjusting element being laterally attached thereto.
In the case of a known valve-actuating lever of this type (DE-Gm 1 908 833), a valve-clearance adjusting element is developed as an eccentric and is clamped between two arms at the forked end of the lever by means of a screw penetrating said arms and said valve-clearance adjusting element. In this case, the tolerances of the width of the eccentric and the distance between the arms must be very small in order to obtain a low clamping strain. As tests have shown, the extent of the clamping strain has considerable influence on the endurance limit of such valve-actuating levers. This endurance limit responds in a linear fashion with respect to the operating strain. To maintain a narrow eccentric clearance tolerance, in the case of large quantitities to be manufactured, is very expensive and costly. In addition, problems occur during the assembly due to the difficulty in fitting the eccentric between the two arms, since an automatic sliding-in of the eccentrics, between the arms, is almost impossible.
The invention is based on the objective to create a valve-actuating lever for an internal combustion engine having a separate valve clearance adjusting element attached to the actuating lever at one end portion thereof and in alignment with the central longitudinal plane of the lever. The lever having the one end portion offset from its central longitudinal plane with the adjusting element being laterally attached thereto. Since no forked end of the lever is used, clamping of the valve-clearance adjusting element can cause no strain through a deformation of a fork formed at the end of the lever and. Additionally, no narrow manufacturing tolerances in regard to the thickness of the valve-clearance adjusting element must be maintained. This eliminates tolerance production problems and permits of an easy assembly. Without the prior art strain a high endurance life for the actuator is obtained.
The invention achieves this objective by having a valve adjusting element attached to the actuating lever at one end portion thereof and in alignment with the central longitudinal plane of the lever. The lever having one end portion offset from its central longitudinal plane with the adjusting element being laterally attached thereto. While it is true that the one-sided fastening of the valve-clearance adjusting element creates torsional strain within the valve-actuating lever, this strain can be handled much more easily and will have a considerably smaller influence on the endurance limit of the lever than the clamping strain occurring in the known fork ended valve-actuating levers. Having the offset portion of the lever being parallel to the central longitudinal plane of the lever results in an especially useful embodiment. Locating a dependent projection on the offset arm cooperating with a similar dependent projection on plate, which is located on the opposite side of the element from the arm, provides a simple and an advantageous lateral guidance for the valve-actuating lever with the end of a valve stem which is especially useful in the case of a where the actuating lever is used as a drag lever. In such an installation, an edge of the plate adjacent a straight edge of the lever is complimentary straight therewith, so as to prohibit rotation of the plate.
An eccentric actuating element is non-rotatably mounted on a rod angularly secured to the offset by means of a screw bolt, or a fillister socket head in the element itself, and at one end of the rod and with a screw nut on the other end. Adjustment of the screw bolt or socket head permits an easy angular adjustment of the valve clearance by means of only two monkey wrenches or s
REFERENCES:
patent: 1264083 (1918-04-01), Jouffret
patent: 1588041 (1926-06-01), Moore
patent: 1950590 (1934-03-01), Berry
patent: 2365401 (1944-12-01), Fisk
patent: 4348916 (1982-09-01), Shimano
patent: 4369740 (1983-01-01), Seidl
Lemberger Heinz
Schausberger Christoph
Bayerische Motoren Werke Aktiengesellschaft
Weakley Harold W.
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