A method for detecting and controlling compaction when compacting a soil by a depth vibrator which has a rotationally drivable imbalance (3) and at least one sensor (6, 12, 13, 14, 19), comprising the steps of: inserting the depth vibrator (2) into the soil (17) up to a desired final depth (Tm); compaction of the the soil (17) during which the forward angle () of the imbalance (3) as well as the oscillation amplitude (A) of the depth vibrator (2) are determined; detection of a soil stiffness profile from soil stiffness values (k) determined over time (t); determination of a first soil stiffness value (k1) and a second soil stiffness value (k2) from the soil stiffness profile (k), for which it applies that a rate of increase (k2) of the second soil stiffness value (k2) exceeds a rate of increase (k1) of the first soil stiffness value (k1) by a defined factor; calculation of a transition soil stiffness value (k12) which is between the first soil stiffness value (k1) and the second soil stiffness value (k2); and storing the transition soil stiffness value (k12) detected in the respective compaction step to the associated depth (T).

A depth vibrator for compacting soil, comprising a rotary drive (3); a drive shaft (4), which is rotatingly drivable about a rotary axis (A) by the rotary drive (3) in a first rotation direction (R1) and in an opposite second rotation direction (R2); a primary mass body (5) connected non-rotatably to the drive shaft (4) and rotates together with the latter about the rotary axis (A); a secondary mass body (6), which is movable into a first rotation position (P1) relative to the primary mass body (5) by rotation of the drive shaft (4) in the first rotation direction (R1) and which is movable into a second rotation position (P2) by rotation of the drive shaft (4) in the second rotation direction (R2). In the first and second rotation position (P1) the secondary mass body (6) can be rotated together with the primary mass body (5) about the rotary axis (A); and the center of mass (S6) of the secondary mass body (6) and the center of mass (S5) of the primary mass body (5) have different radial distances from the rotary axis (A).

An eccentric assembly controlled by a rotational speed thereof. The eccentric assembly includes: a housing driven and rotated by a motor; an eccentric shaft installed in the housing to have a changeable angular position by rotating relative to the housing; a locking device adopted to lock the eccentric shaft by engaging with one side of the eccentric shaft and to unlock the eccentric shaft when a rotational speed of the housing is greater than a locking critical speed; a clamping device adopted to clamp an opposite side of the one side of the eccentric shaft that engages with the locking device and to release clamping to the eccentric when a rotational speed of the housing is greater than a clamping critical speed; and a stopper installed in the housing so as to limit a rotation angle of the eccentric shaft generated when locking and clamping to the eccentric shaft are released.

Provided is an eccentric assembly controlled by a rotational speed thereof. The eccentric assembly includes: a housing driven and rotated by a motor; an eccentric shaft installed in the housing to have a changeable angular position by rotating relative to the housing; a locking device adopted to lock the eccentric shaft by engaging with one side of the eccentric shaft and to unlock the eccentric shaft when a rotational speed of the housing is greater than a locking critical speed; a clamping device adopted to clamp an opposite side of the one side of the eccentric shaft that engages with the locking device and to release clamping to the eccentric when a rotational speed of the housing is greater than a clamping critical speed; and a stopper installed in the housing so as to limit a rotation angle of the eccentric shaft generated when locking and clamping to the eccentric shaft are released.

A vibratory apparatus includes a trough assembly, an exciter assembly and first and second toroidal members. The trough assembly includes a trough and first and second walls attached to the trough with a space disposed therebetween. The exciter assembly includes a central mount with first and second opposite sides and first and second opposite ends, and first and second eccentric assemblies each including at least one motor having a shaft with a shaft axis and at least one eccentric attached to the shaft for rotation about the shaft axis, the first eccentric assembly attached to the first end and the second eccentric assembly attached to the second end. The first toroidal resilient member is disposed between the first wall and the first side and the second toroidal resilient member is disposed between the second wall and the second side, with the exciter assembly disposed in the space.

A tamping unit for tamping a track has tamping tines which are designed for immersion into a ballast bed and which can be set in vibrations by a vibration drive. The vibration drive includes a housing in which a shaft including an eccentric is arranged for rotation about a shaft axis. A transmission element for transmitting a vibratory motion is mounted on the eccentric. The eccentric is connected to the shaft in a rotation-locked and radially displaceable manner, wherein the position of the eccentric relative to the shaft is adjustable in radial direction by an adjustment device. Thus, while retaining the advantages of an eccentric drive, it is possible to adjust vibration parameters during operation.

There is provided a vibration generation device superior in responsivity compared to the related art. The vibration generation device includes a stator, a rotor provided to the stator so as to be able to rotate around the central axis, and having a weight having a gravity center at a position shifted from the central axis, and an air resistance reduction part provided to the weight, and reducing the air resistance to the weight when the rotor rotates. The weight is formed to have a semicircular shape viewed from the axial direction, and the air resistance reduction part has an arcuate part adapted to connect an end edge on the upstream side in the rotational direction of the rotor in the outer circumferential surface of the weight and an end edge on the downstream side in the rotational direction to each other so as to form a circular arc shape.

An adjustment mechanism for a vibratory mechanism of a surface compaction machine, the adjustment mechanism includes a torque limiter coupled between the first eccentric shaft and the second eccentric shaft that prevents relative rotation between the shafts and a phase adjustment between the shafts when a net torque applied to the torque limiter is less than a locking torque threshold. Application of a net torque to the torque limiter that is greater than or equal to the locking torque threshold causes the first eccentric shaft to rotate with respect to the second eccentric shaft. An actuator subassembly selectively applies a linear force cause a first torque to be applied the first eccentric shaft sufficient to apply a net torque to the torque limiter that is greater than or equal to the locking torque threshold to cause the first eccentric shaft to rotate with respect to the second eccentric shaft.