The invention relates to a tracked vehicle (10; 11) comprising a vehicle body (30, 32; 30), at least one track assembly (21) and a suspension device (S) for suspension of said track assembly (21) to said vehicle body (30) of said tracked vehicle (10; 11). Said track assembly (21) comprises a track support beam (22), a plurality of road wheels (23, 23a), at least one drive wheel (24), and an endless track (25). Said track support beam (22) is arranged to support said at least one drive wheel (24) and a plurality of road wheels (23, 23a). Said endless track is disposed around said at least one drive wheel (24) and plurality of road wheels (23, 23a). Said suspension device (S) comprises two pendulum arms (52, 54) which in one end are rotatably attached to a respective fastening point (P1b, P2b) in said vehicle body (30; 32, 30) and in the other end are rotatably attached to a respective fastening point (P1a, P2a) in the track support beam (22) of said track assembly (21). Said suspension device (S) comprises distance adjustment means (58) which is arranged to allow one or more of: a distance change between said two fastening points (P1a, P2a) in the track assembly (21); a distance change between the two fastening points (P1b, P2b) in the vehicle body (30); and a distance change between the fastening point (P1b, P2b) in the vehicle body (30; 32, 30) and the fastening point (P1a, P2a) in the track support beam (22) of said track assembly (21) of at least one of the pendulum arms (52, 54), so as to allow a tilting movement of the track assembly (21), including said at least one drive wheel (24) and plurality of road wheels (23, 23a), relative to the vehicle body in a plane extending in the longitudinal direction of said track assembly (21) essentially orthogonal to the transversal extension of said track assembly (21).

The invention relates to a tracked vehicle (10; 11) comprising a vehicle body (30, 32; 30), at least one track assembly (21) and a suspension device (S) for suspension of said track assembly (21) to said vehicle body (30) of said tracked vehicle (10; 11). Said track assembly (21) comprises a track support beam (22), a plurality of road wheels (23, 23a), at least one drive wheel (24), and an endless track (25). Said track support beam (22) is arranged to support said at least one drive wheel (24) and a plurality of road wheels (23, 23a). Said endless track is disposed around said at least one drive wheel (24) and plurality of road wheels (23, 23a). Said suspension device (S) comprises two pendulum arms (52, 54) which in one end are rotatably attached to a respective fastening point (P1b, P2b) in said vehicle body (30; 32, 30) and in the other end are rotatably attached to a respective fastening point (P1a, P2a) in the track support beam (22) of said track assembly (21). Said suspension device (S) comprises distance adjustment means (58) which is arranged to allow one or more of: a distance change between said two fastening points (P1a, P2a) in the track assembly (21); a distance change between the two fastening points (P1b, P2b) in the vehicle body (30); and a distance change between the fastening point (P1b, P2b) in the vehicle body (30; 32, 30) and the fastening point (P1a, P2a) in the track support beam (22) of said track assembly (21) of at least one of the pendulum arms (52, 54), so as to allow a tilting movement of the track assembly (21), including said at least one drive wheel (24) and plurality of road wheels (23, 23a), relative to the vehicle body in a plane extending in the longitudinal direction of said track assembly (21) essentially orthogonal to the transversal extension of said track assembly (21).

The invention relates to a tracked vehicle (11) comprising a vehicle body (30), at least one track assembly (21) and a suspension device (S). Said track assembly (21) is arranged to be supported by said vehicle body (30) by means of said suspension device (S), said track assembly comprising a track support beam (22) for supporting a plurality of road wheels (23, 23a), an endless track (25) being disposed around said road wheels. Said suspension device (S) comprises a bogie arrangement (50) rotatably attached to a fastening point (P0) of said vehicle body (30) about an axis of rotation (Z0) transversal to the longitudinal extension of said track assembly (21) and attached to said track support beam (22) in connection to at least two fastening points (P1, P2) so that the track support beam (22) is allowed to rotate in a rotational plane extending along the longitudinal extension of said track support beam (22) about said axis of rotation.

The invention relates to a tracked vehicle (11) comprising a vehicle body (30), at least one track assembly (21) and a suspension device (S). Said track assembly (21) is arranged to be supported by said vehicle body (30) by means of said suspension device (S), said track assembly comprising a track support beam (22) for supporting a plurality of road wheels (23, 23a), an endless track (25) being disposed around said road wheels. Said suspension device (S) comprises a bogie arrangement (50) rotatably attached to a fastening point (P0) of said vehicle body (30) about an axis of rotation (Z0) transversal to the longitudinal extension of said track assembly (21) and attached to said track support beam (22) in connection to at least two fastening points (P1, P2) so that the track support beam (22) is allowed to rotate in a rotational plane extending along the longitudinal extension of said track support beam (22) about said axis of rotation.

A drive sprocket for driving a track of a utility track vehicle is provided. The drive sprocket includes a pair of spaced-apart inner rings having a spacer fixedly attached between the inner rings. An adapter is attached to an outwardly-directed surface of one of the inner rings. A plurality of rods are attached in a spaced-apart manner about the outer peripheral edge of the inner rings. A guide ring is attached to each end of the rods in a perpendicular manner, wherein the guide rings are substantially parallel to the inner rings.

A drive sprocket for driving a track of a utility track vehicle is provided. The drive sprocket includes a pair of spaced-apart inner rings having a spacer fixedly attached between the inner rings. An adapter is attached to an outwardly-directed surface of one of the inner rings. A plurality of rods are attached in a spaced-apart manner about the outer peripheral edge of the inner rings. A guide ring is attached to each end of the rods in a perpendicular manner, wherein the guide rings are substantially parallel to the inner rings.

The present invention is related to a track unit for a vehicle, such as an agricultural harvesting combine. The track unit according to a first embodiment of the invention comprises one or more bogies arranged between front and rear guide wheels. The bogies are provided with wheel pairs that are rotatably arranged about a longitudinal axis of the bogie itself, and are thereby capable of adapting individually to transversal oscillations caused by the terrain. Preferably, the bogies are furthermore equipped to adapt to longitudinal oscillations as well, by the longitudinal portion of the bogie being rotatable about a transversal axis. According to a second embodiment, the track unit of the invention is equipped with a cutter, non-rotatably mounted on one or both outer faces of the rear guide wheel, in a position where said wheel is in direct contact with the track, the cutter being configured to cut crop material that is transported upwards between the rear guide wheel and the track when the track unit moves forward.

In one aspect of the present invention is provided an attachment device (100) for attachment of a trailing arm (54a) to a track support beam (22) intended to be connected, via said trailing arm (54a), to a center beam (30, 32) or other structural element situated between two track assemblies (21) of a tracked vehicle (10). The attachment device (100) is secured to the track support beam (22) and configured to attach the trailing arm (54a) to the track support beam (22) via an axis (X2) running above and substantially centrally along an upper side of the track support beam (22), in the longitudinal direction of the track support beam. In this way, a robust, structurally strong, suspension-admitting attachment device that is easy to manufacture and assemble is achieved. In another aspect of the invention is provided a tracked vehicle (10) comprising such an attachment device (100) and in a further aspect of the invention a method of manufacturing a track support beam (22) comprising such an attachment device (100).

An LED driver is provided. The LED driver comprises a plurality of driving units and a fold circuit. The driving units are coupled to an LED string including a plurality of LEDs for driving the LEDs. The fold circuit is coupled to the LED string and divides the LED string into a plurality of LED segments when an input voltage is lower than a threshold voltage. The LED segments are coupled to each other in parallel, and the input voltage is supplied to the LED segments.

An LED driver is provided. The LED driver comprises a plurality of driving units and a fold circuit. The driving units are coupled to an LED string including a plurality of LEDs for driving the LEDs. The fold circuit is coupled to the LED string and divides the LED string into a plurality of LED segments when an input voltage is lower than a threshold voltage. The LED segments are coupled to each other in parallel, and the input voltage is supplied to the LED segments.