A surface compactor machine includes a compacting surface for compacting a substrate, a first motor, a second motor, a support assembly, and a controller. The first motor rotates a first eccentric shaft. The second motor rotates a second eccentric shaft. The support assembly is connected to the first and second eccentric shafts to transfer vibration forces to the compacting surface. The controller controls speed of at least one of the first and second motors so that a rotational speed of the second eccentric shaft is an integer, greater than 1, times faster than a rotational speed of the first eccentric shaft to generate a composite displacement waveform that vibrates the compacting surface upwards and downwards, wherein the composite displacement waveform includes a zero amplitude coordinate, a wave section located above the zero amplitude coordinate, and a wave section located below the zero amplitude coordinate that is asymmetric relative to the wave section located above the zero amplitude coordinate.

A method for operating a self-propelled road construction machine, in particular a ride-on ground compaction machine, and a self-propelled road construction machine, in particular a ride-on ground compaction machine.

A vibratory compaction machine includes one or more vibratory energy converter assemblies. Each vibratory energy converter assembly includes a housing coupled to the vibratory compaction machine, which transfers vibration energy from an eccentric vibration system of the vibratory compaction machine to the vibratory energy converter assembly. Each vibratory energy converter assembly includes an actuator that is carried by the housing. The actuator has a translational degree of freedom of movement with respect to the housing, and vibration of the housing by the vibratory compaction machine causes movement of the actuator with respect to the housing in a first direction. Each vibratory energy converter assembly includes a generator subassembly to convert mechanical vibratory energy of the movement of the actuator into electrical energy.

A surface compactor machine includes a cylindrical drum defining a cylindrical space in an interior portion of the cylindrical drum and having a central axis of rotation, and a counterweight in the cylindrical space. The compactor further includes a non-driven support wheel affixed to the counterweight and in contact with an underlying portion of an interior surface of the cylindrical drum beneath the counterweight. A drive motor is provided in the cylindrical space, and a drive wheel is mechanically rotatable by the drive motor. The drive wheel contacts an inner surface of the cylindrical drum such that rotation of the drive wheel by the drive motor urges the cylindrical drum to rotate about the central axis of rotation.

A compactor roller for a soil compactor comprises a roller shell (24), rotatable about a roller axis of rotation (W) and surrounding a roller interior (23), an oscillation/vibration assembly (28) arranged in the roller interior (23), wherein the oscillation/vibration assembly (28) comprises a first oscillation/vibration unit (30) with at least one drivable first unbalanced mass (50, 50′) for rotation about a first oscillation/vibration axis of rotation (D.sub.1), and a second oscillation/vibration unit (32) with at least one drivable second unbalanced mass (52, 52′) for rotation about a second oscillation/vibration axis of rotation (D.sub.2.) A center of mass of a second unbalanced mass part of the at least one first unbalanced mass (50, 50′) and/or a center of mass of a second unbalanced mass part of the at least one second unbalanced mass (52, 52′) moves, during the movement of the respective second unbalanced mass part (62, 86) between two end positions about the assigned oscillation/vibration axis of rotation (D.sub.1, D.sub.2) in an angle of less than 180°.

An electronic control unit for a compactor obtains a planned operating profile of the compactor, generates a predicted power expenditure schedule for the compactor based on the planned operating profile, determines, based on the predicted power expenditure schedule, that a predicted energy expenditure of the compactor exceeds an available energy of the compactor, generates a modified operating profile in response to determining that the predicted energy expenditure of the compactor exceeds the available energy of the compactor, and operates the compactor according to the modified operating profile.

A method for compacting asphalt material (A) by means of at least one soil compactor (10) having at least one compactor roller with a motion generation arrangement assigned to the same, comprising the measures: a) detection of an asphalt temperature of the asphalt material (A) to be compacted, b) static compaction of the asphalt material (A) with a deactivated motion generation arrangement of the at least one compactor roller, if the asphalt temperature lies above an upper threshold temperature (O), c) static compaction of the asphalt material (A) with a deactivated motion generation arrangement of the at least one compactor roller, if the asphalt temperature lies below a lower threshold temperature (U),
wherein the upper threshold temperature (O) and/or the lower threshold temperature (U) is/are set depending on at least one surroundings parameter (T) influencing the cooling behavior of the asphalt material to be compacted.

An oscillation module for a compacting roller of a soil compactor includes a plate-like carrier, at least two oscillation mass units supported on the carrier at a distance from one another, and an oscillation drive motor supported on the carrier. The carrier has a connection formation for firmly connecting the carrier to a carrier structure of a compacting roller. Each oscillation mass unit includes an imbalance mass rotatably supported on the carrier about an oscillation axis of rotation. Each imbalance mass of each oscillation mass unit can be driven by the oscillation drive motor for rotation about the respectively assigned oscillation axis of rotation.

The present invention relates to a device for generating vibrations for a ground compaction machine, in particular a self-propelled ground compaction roller, comprising a first imbalance mass and a second imbalance mass, each of which is rotatably mounted, a first hydraulic motor configured to set the first imbalance mass into rotation, a planetary gear connected to the first hydraulic motor and via which the second imbalance mass can be driven, a second hydraulic motor which is also connected to the planetary gear and is configured to change the transmission ratio from the first hydraulic motor to the second imbalance mass via the planetary gear, wherein a third hydraulic motor is provided which is also connected to the planetary gear and is also configured to change the transmission ratio from the first hydraulic motor to the second imbalance mass via the planetary gear. Moreover, the present invention relates to a ground compaction machine and a method for operating the device and the ground compaction machine, respectively.

An adjustable mass eccentric for a multi-amplitude vibratory mechanism can comprise a body and an internal cavity defined by the body such that the body surrounds the internal cavity. The internal cavity can include a first section, a second section, and a third section between the first section and the second section. The third section can define a volume and/or an area less than respective volumes and/or areas of the first section and the second section of the internal cavity. Filler material may be provided in the internal cavity and can migrate to and from the first, second, and third sections based on rotational movement of the body and internal cavity.