Oscillator for soil or road tampers

Abstract

An oscillator or vibration exciter for soil or road tampers or compacting devices. Unbalanced shafts are journalled parallel to each other in a common housing, and are driven in opposite directions by gears which mesh with each other and are installed on the unbalanced shafts. Each shaft supports a centrifugal weight rigidly coupled therewith. One gear is rigidly connected with its unbalanced shaft, while the other gear is rotatably arranged on its unbalanced shaft and is coupled therewith in such a way that it can be shifted in the direction of rotation by shift pins, which are anchored in a slide piece which can be axially shifted in this unbalanced shaft. The shift pins project outwardly through a longitudinal slot in the unbalanced shaft. This other rotatable gear, on both sides, has stop faces which extend nearly radially as well as axially, and point in the same rotational direction. A shift pin is provided on each side of this gear, one end of each shift pin projecting from the unbalanced shaft. Both shift pins are axially spaced from one another, on a common slide piece, by such a distance that one of the shift pins is always located just out of alignment with the stop face on its side of the gear when the other shift pin on the other side has been shifted completely into alignment with the stop face associated therewith, in which connection the angular positioning of the stop faces and/or the shift pins are staggered relative to each other with respect to the unbalanced shaft.