Hydraulically actuated stroke adjusting device
AssigneeLEWA Herbert Ott GmbH & Co.
InventorHorst Fritsch
Life of this patent
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Abstract
In a stroke adjusting device on pumps, in particular proportioning pumps, a hydraulic actuation occurs due to the fact that a hollow shaft, which guides in its interior a sliding shaft, is formed as a hydraulic cylinder, in which the sliding shaft, designed as a double action hydraulic piston, is slidable axially in both directions by means of a hydraulic fluid. Owing to this, the required axial adjusting movement of the sliding shaft is not brought out of the hollow shaft axially to the outside, whereby the two ends of the hollow shaft are kept free for the coupling of several engines or pumps.
Claims11
A stroke adjusting device for a oscillating displacement pump, said device comprising an eccentric disk for converting rotary motion of a drive wheel into an oscillating motion of a connecting rod arranged at right angles to said drive wheel;
- a hollow shaft mounted rotatably but fixed axially in a propulsion mechanism housing, said hollow shaft attached to said drive wheel for rotary motion therewith and attached to said eccentric disk for rotating said eccentric disk said hollow shaft containing a sliding shaft coupled with said eccentric disk via a positioning element slot obliquely inclined to the axis of said sliding shaft, characterized in that an inner portion of said hollow shaft has a portion closed by cylinder covers to define a hydraulic cylinder therien in which the sliding shaft operates as a double action hydraulic piston for displacement of said positioning element along the axis of said hollow shaft, in both directions, by a hydraulic fluid, said displacement adjusting the stroke of one of said oscillating displacement pumps connected to said eccentric disk, the stroke adjusted by shifting said positioning element.
Device according to claim 8, characterized in that the linkage is a rod (35) extending axially away from the sliding shaft (17) and having a transverse rod (37) connected with it which engages in a non-rotational, axially displaceable sliding ring (39).
The oscillating displacement pump according to claim 11 wherein additional eccentric propulsion mechanisms are coupled to at least one of the ends of said hollow shaft and/or said sliding shaft.
Dependencies are inferred from the claim text.