An undercarriage assembly of a work machine includes a drive wheel, front and rear idler wheels and a plurality of supporting mid-rollers. A belt disposed about the drive and idler wheels. A roller frame defines a main pivot axis located between front and rear ends. The front idler wheel is connected to the front end of the track roller frame. A major bogie having a forward bogie arm and a trailing bogie arm pivotably connects to the roller frame. The rear idler wheel connects to the trailing bogie arm. The major bogie pivot is offset from the main pivot along the roller frame such that the major bogie pivot is between the main pivot and the rear end of the roller frame. A minor bogie is connected to the major bogie at a minor bogie pivot defining a minor bogie pivot axis with the mid-rollers mounted on the minor bogie.

An undercarriage assembly of a work machine includes a drive wheel, front and rear idler wheels and a plurality of supporting mid-rollers. A belt disposed about the drive and idler wheels. A roller frame defines a main pivot axis located between front and rear ends. The front idler wheel is connected to the front end of the track roller frame. A major bogie having a forward bogie arm and a trailing bogie arm pivotably connects to the roller frame. The rear idler wheel connects to the trailing bogie arm. The major bogie pivot is offset from the main pivot along the roller frame such that the major bogie pivot is between the main pivot and the rear end of the roller frame. A minor bogie is connected to the major bogie at a minor bogie pivot defining a minor bogie pivot axis with the mid-rollers mounted on the minor bogie.

A mobile farm implement includes a track assembly with a plurality of arms that are pivotally coupled to support idler wheels and bogie wheels such that the track assembly is able to better conform to the terrain when the implement is towed behind a tractor or otherwise moved.

A mobile farm implement includes a track assembly with a plurality of arms that are pivotally coupled to support idler wheels and bogie wheels such that the track assembly is able to better conform to the terrain when the implement is towed behind a tractor or otherwise moved.

A pressure system of a suspension device for an amphibious vehicle includes: a pump configured to discharge a working fluid; a first control valve disposed in a first flow path extending between the pump and a first hydraulic chamber, the first control valve being configured to control supply of the working fluid from the pump to the first hydraulic chamber; a pilot check valve disposed in a portion of the first flow path which extends between the first hydraulic chamber and the first control valve, the pilot check valve being configured to open and close the first flow path in accordance with a pilot pressure; and a second control valve disposed in a pilot flow path extending between the pump and the pilot check valve, the second control valve being configured to control supply of the pilot pressure to the pilot check valve.

A pressure system of a suspension device for an amphibious vehicle includes: a pump configured to discharge a working fluid; a first control valve disposed in a first flow path extending between the pump and a first hydraulic chamber, the first control valve being configured to control supply of the working fluid from the pump to the first hydraulic chamber; a pilot check valve disposed in a portion of the first flow path which extends between the first hydraulic chamber and the first control valve, the pilot check valve being configured to open and close the first flow path in accordance with a pilot pressure; and a second control valve disposed in a pilot flow path extending between the pump and the pilot check valve, the second control valve being configured to control supply of the pilot pressure to the pilot check valve.

The invention concerns a suspension device for a tracked vehicle, comprising a track assembly (10) at the side of a centre beam (14), comprising a track support beam (20), two wheels (21, 22), several support wheels (23) and an endless track (11) that runs in a plane of rotation (A, A), a first suspension mounting with which the support wheels (23) are suspended at the track support beam (20) in a manner that allows pivoting, a second suspension mounting comprising a combination of a first spring strut (25A) and a first pendulum arm (26A) and a second spring strut (25B) and a second pendulum arm (26B) with which combinations the centre beam (14) of the chassis is spring-damped at a forward and rear end of the track support beam (20). According to the invention, a first pendulum arm (26A) is located in front of the second pendulum (26B), each pendulum arm (26A, 26B) is fixed at its first end in a manner that allows pivoting at a first joint (27, 27) the centre beam (14) of the chassis and at its second end at a second joint (28, 28) at the track support beam (20), each spring strut (25A, 25B) is fixed at one of its ends (30, 30) in a jointed manner at the centre beam (14) of the chassis and at its second end (31, 31) is fixed in a jointed manner at a pendulum arm (26A, 26B), the pendulum arms (26A, 26B) pivot in a plane-parallel manner with the planes of rotation (A, A) of the track (11).

The invention concerns a suspension device for a tracked vehicle, comprising a track assembly (10) at the side of a centre beam (14), comprising a track support beam (20), two wheels (21, 22), several support wheels (23) and an endless track (11) that runs in a plane of rotation (A, A), a first suspension mounting with which the support wheels (23) are suspended at the track support beam (20) in a manner that allows pivoting, a second suspension mounting comprising a combination of a first spring strut (25A) and a first pendulum arm (26A) and a second spring strut (25B) and a second pendulum arm (26B) with which combinations the centre beam (14) of the chassis is spring-damped at a forward and rear end of the track support beam (20). According to the invention, a first pendulum arm (26A) is located in front of the second pendulum (26B), each pendulum arm (26A, 26B) is fixed at its first end in a manner that allows pivoting at a first joint (27, 27) the centre beam (14) of the chassis and at its second end at a second joint (28, 28) at the track support beam (20), each spring strut (25A, 25B) is fixed at one of its ends (30, 30) in a jointed manner at the centre beam (14) of the chassis and at its second end (31, 31) is fixed in a jointed manner at a pendulum arm (26A, 26B), the pendulum arms (26A, 26B) pivot in a plane-parallel manner with the planes of rotation (A, A) of the track (11).

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).