A construction machine having a frame and at least one compaction member is provided. The machine also includes a propulsion system having a hydraulic motor adapted to rotate the compaction member. The propulsion system also includes a hydraulic pump fluidly coupled to the hydraulic motor via a high pressure line and a low pressure line. The high pressure line allows flow of a fluid at high pressure from the hydraulic pump to the hydraulic motor. The low pressure line allows flow of the fluid at low pressure from the hydraulic motor to the hydraulic pump. The propulsion system further includes a hydraulic valve fluidly coupled to the low pressure line and a casing of the hydraulic motor. The hydraulic valve selectively allows flow of a portion of the fluid at low pressure from the low pressure line to the casing for cooling of the hydraulic motor.

An earth working roller for use in an earth working machine includes a roller drum, which extends in a direction along a roller axis of rotation, surrounds a roller interior, and has a circular outer circumferential contour, wherein a substrate breaking configuration is provided on the outer circumferential surface of the roller drum. The substrate breaking configuration includes a plurality of impact bars along the roller drum in the direction of the roller drum axis of rotation, as well as a plurality of breaker bars along the roller drum in a circumferential direction.

A compaction machine includes a frame and a compactor drum. The compactor drum includes a vibratory system and a support structure. The vibratory system includes a vibratory mechanism coupled to the support structure. The vibratory mechanism includes a cavity having a radial outer wall. The radial outer wall is curved and is eccentric with respect to an axis of rotation of the vibratory system. Further, the radial outer wall extends around the axis of rotation. The vibratory mechanism also includes a non-fixed weight provided within the cavity. The non-fixed weight is adapted to move within the cavity. A movement of the non-fixed weight within the cavity generates multiple vibration amplitudes as the vibratory system rotates in a first direction and a second direction. The first direction is opposite to the second direction.

An earth working roller for use in an earth working machine includes a roller drum, which extends in a direction along a roller axis of rotation, surrounds a roller interior, and has a circular outer circumferential contour, wherein a substrate breaking configuration is provided on the outer circumferential surface of the roller drum. The substrate breaking configuration includes a plurality of impact bars along the roller drum in the direction of the roller drum axis of rotation, as well as a plurality of breaker bars along the roller drum in a circumferential direction.

The invention relates to a method of, and system for, obtaining an indication of the soil strength of soil over which a compactor roller travels. The method includes determining the depth to which a drum of the compactor roller penetrates into and depresses the soil when the compactor roller travels over a soil surface. The system includes a compactor roller, a measuring arrangement and a processor which is operatively connected to the measuring arrangement and which is configured to process data received from the measuring arrangement. The measuring arrangement includes an inertial measurement unit which is operatively connected to the compactor roller, wherein the arrangement is configured to obtain an indication of the soil strength of soil over which the compactor roller travels during operation, by determining the depth to which the drum penetrates into and depresses the soil over which it travels.

An earth working roller for use in an earth working machine comprising a roller drum (30), which extends in a direction along a roller axis of rotation (D), surrounds a roller interior (34), and has an essentially circular outer circumferential contour, wherein a substrate breaking configuration (38) is provided on the outer circumferential surface (32) of the roller drum (30), characterized in that the substrate breaking configuration (38) comprises a plurality of impact bars (40) along the roller drum (30) essentially in the direction of the roller drum axis of rotation (D), as well as a plurality of breaker bars (44) along the roller drum (30) in an essentially circumferential direction.

A vibratory compactor that generates vibrations by rotation of eccentric masses is provided, which includes an inner eccentric rod positioned inside a roller drum of the vibratory compactor and provided with a rack formed on one side of the inner eccentric rod, a pinion engaged with the rack, a variable eccentric weight engaged with the pinion so that a distance between the variable eccentric weight and a rotation axis of the inner eccentric rod is changed as the pinion is rotated, and an outer eccentric tube including a hole formed thereon to guide movement of the rack back and forth and a support fixture formed thereon to fix a shaft of the pinion so that the pinion is rotated in engagement with the rack, wherein when the inner eccentric rod moves back and forth, the pinion that is engaged with the rack is rotated as much as the movement of the rack, and as a position of the variable eccentric weight is changed, an amplitude of vibration of the roller drum is changed.

An imprint roller comprises a roller assembly, a frame, and a motor assembly. The roller assembly is supported on the frame and includes a vibrator head and a roller tube having a roller surface. An operator of the imprint roller may grip the frame and support at least a portion of the frame during operation of the imprint roller. The motor assembly is supported on the frame and operable to transfer mechanical energy through the frame to the vibrator head included in the roller assembly.

A block compactor equipped with a brake mechanism capable of securely locking rollers with a simple structure and stably maintaining a locked state and an unlocked state even when exposed to vibration. A brake pad is fixed to a lower end portion of a brake shaft and is configured to be rotatable together with the brake shaft between two rollers adjacent in the front and rear. By rotating a brake lever, the brake pad can be switched between an unlocked state in which the brake pad does not contact with the outer circumferential surfaces of the rollers, and the rollers are free to rotate, and a locked state in which the brake pad contacts with the outer circumferential surfaces of the rollers, and the rollers cannot rotate with the friction force.