Abstract: An arrangement for the suspension of wheels of a working machine moving on a terrain, the arrangement comprising a pair of adjacent wheels arranged to support a frame part placed on a center line between the wheels; suspensions arranged between each wheel and the frame part to elevate and descend each wheel with respect to the frame part, wherein each suspension comprises a lower suspension arm and an upper suspension arm, which lower suspension arms are mounted by means of first joints to the frame part and by means of second joints to mounting arms, in which the wheels are mounted in a rotatable manner, and which upper suspension arms are fixed by means of third joints to the frame part and by means of fourth joints to the mounting arms, wherein, in each suspension, the first joint and/or the third joint is placed on said center line.

Abstract: The invention relates to a chassis structure for a working machine moving on a terrain, the chassis structure comprising a pair of front wheels and a pair of rear wheels supporting the frame, and a controlled frame joint between the frame parts, when the frame is composed of two frame parts. The chassis structure further comprises a suspension controlled by actuators and arranged to move each wheel in a level transverse in relation to the frame. Each wheel is mounted rotatably and to turn by the actuators to the suspension, and each wheel is usually provided with a hub motor for drive transmission. The chassis structure can further comprise a pair of middle wheels for a second frame part. In a method related to the chassis structure the forest machine can also be turned in place.

Abstract: An arrangement for the suspension of wheels of a working machine moving on a terrain, the arrangement comprising a pair of adjacent wheels arranged to support a frame part placed on a center line between the wheels; suspensions arranged between each wheel and the frame part to elevate and descend each wheel with respect to the frame part, wherein each suspension comprises a lower suspension arm and an upper suspension arm, which lower suspension arms are mounted by means of first joints to the frame part and by means of second joints to mounting arms, in which the wheels are mounted in a rotatable manner, and which upper suspension arms are fixed by means of third joints to the frame part and by means of fourth joints to the mounting arms, wherein, in each suspension, the first joint and/or the third joint is placed on said center line.

Abstract: An arrangement of the suspension of wheels of a working machine moving on a terrain. The arrangement comprises a pair of wheels arranged next to each other to support a frame part placed on a center line between the wheels suspensions between each wheel and the frame part, wherein each suspension comprises a lower suspension arm and an upper suspension arm which lower suspension arms are mounted by means of first joints to the frame part using first joints and to mounting arms using second joints in which the wheels are mounted in a rotatable manner, and which upper suspension arms are fixed by means of third joints to the frame part and by means of fourth joints to the mounting arms. The wheels are arranged to be turnable around a substantially vertical axis, and the wheel is arranged to be turned by means of a cylinder actuator coupled between the mounting arm the wheel.

Abstract: The invention relates to a chassis structure for a working machine moving on a terrain, the chassis structure (40, 60) comprising a pair of front wheels and a pair of rear wheels supporting the frame (41 to 42, 61 to 62), and a controlled frame joint (63) between the frame parts (41, 42, 61, 62), when the frame is composed of two frame parts. The chassis structure (40, 60) further comprises a suspension (1a) controlled by actuators and arranged to move each wheel in a level transverse in relation to the frame. Each wheel is mounted rotatably and to turn by means of the actuators to the suspension, and each wheel is usually provided with hub motor means for drive transmission. The chassis structure (40, 60) can further comprise a pair of middle wheels for a second frame part (42, 62). In a method related to the chassis structure (40, 60) the forest machine can also be turned in place.

Abstract: The invention relates to an arrangement for the suspension of wheels of a working machine moving on a terrain. The arrangement comprises a pair of wheels (2a, 2b) arranged next to each other to support a frame part (1) placed on a centre line (CL) between the wheels (2a, 2b), suspensions (1a, 1b) between each wheel (2a, 2b) and the frame part (1), wherein each suspension (1a, 1b) comprises a lower suspension arm (6a, 6b) and an upper suspension arm (7a, 7b), which lower suspension arms (6a, 6b) are mounted by means of first joints (10a, 10b) to the frame part (1) and by means of second joints (8a, 8b) to mounting arms (5a, 5b), in which the wheels (2a, 2b) are mounted in a rotatable manner, and which upper suspension arms (7a, 7b) are fixed by means of third joints (11a, 11b) to the frame part (1) and by means of fourth joints (9a, 9b) to the mounting arms (5a, 5b).