Machine element or mechanism – Mechanical movements – Reciprocating to or from oscillating
Patent
1985-11-15
1987-10-06
Husar, Cornelius J.
Machine element or mechanism
Mechanical movements
Reciprocating to or from oscillating
74 99R, 74108, 92 68, 92140, 92147, F16H 2144
Patent
active
046974687
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a rotary mechanism for converting a reciprocal linear motion of an actuator, e.g. constituted by a piston-cylinder unit controlled by a pressurized fluid, into an oscillating rotary motion of an output shaft.
In known rotary mechanisms of this kind, e.g. operating with rack and gear means, a maximum torque is obtained between the end positions of the rotary motion, or a constant torque is developed during the entire stroke. However, such a characteristic is often disadvantegeous. In case, e.g., the rotary mechanism is to be used for operating a valve between open and closed positions, a maximum torque is needed especially in these end positions.
SUMMARY OF THE INVENTION
Thus, a primary object of the invention is to achieve a rotary mechanism which provides an increased torque at the end positions and which is generally useful, e.g. as an actuator or a transport device.
This object is achieved, according to the invention, by a rotary mechanism, the actuator of which comprises two co-operating, complementarily operating actuating units, each such unit being link-connected to a lever arm fastened to the output shaft, said two actuating units operating nonuniformly in speed while being mutually motion controlled via the shaft in such a way that the two actuating units deliver an increased torque adjacent to each one of the end positions of the rotary motion. These end positions may have a desired relative angular distance, which, e.g., may be 90.degree. or 180.degree. in standard applications.
These two acutating units, preferably in the form of pressurized fluid working cylinders, complement each other in such a way that one of the units provides an increased torque adjacent to one end position of the rotary motion (wherein the other unit contributes considerably less), whereas the other unit produces an increased torque adjacent to the other end position of the rotary motion. A considerably increased torque will be obtained if the linear movement direction of each actuating unit is approximately transversal to a link, coupled between the lever arm of the shaft and the actuating unit, in the particular end position. With such an arrangement, even a self-locking effect in the end positions is obtained, especially if the actuating units are linearly guided. If the stroke of the actuating unit is suitably dimensioned, an effective end position damping effect of the rotary motion can possibly be achieved, wherein the kinetic energy is absorbed by the link mechanism and adjoining guiding means.
According to the preferred embodiment, both actuating units are link-connected to a common lever arm, in particular a triangular lever arm, in which case the actuating units thus operate in the same plane as the motion plane of the lever arm, e.g., in parallel and adjacent to each other.
BRIEF DESCRIPTION OF THE DRAWINGS
Thus, the invention will be further explained below with reference to the appended drawing, which illustrates two embodiments.
FIG. 1 shows schematically in perspective view a rotary mechanism according to the invention, wherein a portion of a surrounding casing in cut away for the purpose of illustration of the basic parts of the mechanism;
FIG. 2 shows the rotary mechanism according to FIG. 1 in side view, partly in longitudinal section;
FIG. 3 shows, in a view corresponding to FIG. 2, another embodiment of the rotary mechanism according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The rotary mechanism shown in FIGS. 1 and 2 comprises essentially two pneumatic cylinders 1, 2 being arranged in parallel adjacent to each other and serving as actuating units, and a guiding and linking arrangement disposed in a casing 3, by means of which the linear motion of the pneumatic cylinders is transformed into a rotary motion of an output shaft 4.
According to the invention, the two pneumatic cylinders 1, 2 co-operate while being mutually motion controlled in that their piston rods 1a and 2a, respectively, are coupled via links to a common le
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Husar Cornelius J.
Moveco System AB
Williams Todd G.
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