Crawler drive for an agricultural work machine and agricultural work machine
A crawler drive for an agricultural work machine is disclosed. The crawler device includes front and rear main wheels, front and rear main frames associated with the front and rear main wheels respectively, two support wheels, a running belt surrounding the main wheels and an articulation point to pivotably connect to a body of the agricultural work machine while forming a machine axis. The two main frames, coupled to one another, pivot about a common pivot axis. The support wheels are positioned on a common support frame, which is pivotably connected to the front main frame. A coupling member is coupled at a swing arm end of the coupling member to the support wheel swing arm and at a frame end of the coupling member to the rear main frame and thereby couples the support wheel swing arm and the rear main frame to one another.
1 . A crawler drive for an agricultural work machine comprising:
a front main wheel;
a rear main wheel opposite the front main wheel viewed in a longitudinal direction of the crawler drive;
a front main frame associated with the front main wheel;
a rear main frame associated with the rear main wheel;
at least two support wheels positioned in an intermediate region between the front main wheel and the rear main wheel;
a running belt spanning the main wheels;
an articulation point by which the crawler drive is configured to be pivotably connected to a body of the agricultural work machine while forming a machine axis; and
a coupling member;
wherein the front main frame and the rear main frame are pivotably coupled to one another about a common pivot axis;
wherein the support wheels are positioned one behind the other on a common support frame relative to a longitudinal axis of the crawler drive;
wherein the support frame is pivotably connected to the front main frame via a support wheel swing arm; and
wherein the coupling member is coupled to the support wheel swing arm at a swing arm end of the coupling member and to the rear main frame at a frame end of the coupling member, and thereby couples the support wheel swing arm and the rear main frame to one another.
2 . The crawler drive of claim 1 , wherein the coupling member is aligned in such a way that a straight member axle connecting the swing arm end and the frame end is oriented inclined at most by 15° relative to a vertical line.
3 . The crawler drive of claim 1 , wherein the coupling member is aligned in such a way that a straight member axle connecting the swing arm end and the frame end is oriented inclined at most by 10° relative to a vertical line.
4 . The crawler drive of claim 1 , wherein the coupling member is aligned in such a way that a straight member axle connecting the swing arm end and the frame end is oriented inclined at most by 5° relative to a vertical line.
5 . The crawler drive of claim 1 , wherein the common pivot axis of the front main frame and the rear main frame coincides with the machine axis.
6 . The crawler drive of claim 1 , wherein the swing arm end and the frame end of the coupling member are positioned on a same side of a vertically oriented central plane containing the pivot axis.
7 . The crawler drive of claim 1 , wherein the swing arm end of the coupling member is positioned in a direction parallel to the longitudinal axis of the crawler drive viewed from the machine axis at a distance of at most ¼ of a correspondingly measured wheel distance between axes of rotation of the front main wheel and the rear main wheel.
8 . The crawler drive of claim 1 , wherein the swing arm end of the coupling member is positioned in a direction parallel to the longitudinal axis of the crawler drive viewed from the machine axis at a distance of at most ⅙ of a correspondingly measured wheel distance between axes of rotation of the front main wheel and the rear main wheel.
9 . The crawler drive of claim 1 , wherein the swing arm end of the coupling member is positioned in a direction parallel to the longitudinal axis of the crawler drive viewed from the machine axis at a distance of at most ⅛ of a correspondingly measured wheel distance between axes of rotation of the front main wheel and the rear main wheel.
10 . The crawler drive of claim 1 , wherein axes of rotation of the front main wheel and the rear main wheel and the pivot axis lie at least substantially on a common height level when the crawler drive is in a central position in which the crawler drive is standing on level ground.
11 . The crawler drive of claim 1 , further comprising a spring element whose first end is connected to the front main frame and whose second end is connected to the rear main frame; and
wherein the spring element is configured to apply mutual torque about the common pivot axis to one or both of the front main frame and the rear main frame at least when the pivot axis is located above a zero position which a respective front main wheel or a respective rear main wheel assumes when the crawler drive is in a center position in which the crawler drive stands on level ground.
12 . The crawler drive of claim 11 , wherein the spring element comprises a passive spring element.
13 . The crawler drive of claim 1 , further comprising an active piston-cylinder unit a first end of which is connected to the front main frame, and a second end of which is connected to the rear main frame; and
wherein the active piston-cylinder unit is configured to actively apply a mutual torque about the common pivot axis to the front main frame and the rear main frame.
14 . The crawler drive of claim 1 , wherein the coupling member is formed by a piston-cylinder unit; and
wherein the piston-cylinder unit is configured to dampen movements which the support wheels and the rear main frame perform relative to one another.
15 . The crawler drive of claim 14 , wherein the piston-cylinder unit is designed as dual-acting; and
wherein pressure is applied to a piston-side secondary pressure chamber; and
wherein the pressure in a cylinder-side main pressure chamber is configured to be adjusted so that the pressure in the main pressure chamber is within a preset range.
16 . An agricultural work machine comprising:
a body;
a left crawler drive;
a right crawler drive;
wherein the left crawler drive and the right crawler drive are each connected to the body via at least one articulation point; and
wherein at least one of the left crawler drive or the right crawler drive comprises:
a front main wheel;
a rear main wheel opposite the front main wheel viewed in a longitudinal direction of the crawler drive;
a front main frame associated with the front main wheel;
a rear main frame associated with the rear main wheel;
at least two support wheels positioned in an intermediate region between the front main wheel and the rear main wheel;
a running belt spanning the main wheels;
an articulation point by which the crawler drive is configured to be pivotably connected to a body of the agricultural work machine while forming a machine axis; and
a coupling member;
wherein the front main frame and the rear main frame are pivotably coupled to one another about a common pivot axis;
wherein the support wheels are positioned one behind the other on a common support frame relative to a longitudinal axis of the crawler drive;
wherein the support frame is pivotably connected to the front main frame via a support wheel swing arm; and
wherein the coupling member is coupled to the support wheel swing arm at a swing arm end of the coupling member and to the rear main frame at a frame end of the coupling member, and thereby couples the support wheel swing arm and the rear main frame to one another.
17 . The agricultural work machine of claim 16 , wherein the coupling member is aligned in such a way that a straight member axle connecting the swing arm end and the frame end is oriented inclined at most by 15° relative to a vertical line.
18 . The agricultural work machine of claim 16 , wherein the common pivot axis of the front main frame and the rear main frame coincides with the machine axis.
19 . The agricultural work machine of claim 16 , wherein the swing arm end and the frame end of the coupling member are positioned on a same side of a vertically oriented central plane containing the pivot axis.
20 . The agricultural work machine of claim 16 , wherein the swing arm end of the coupling member is positioned in a direction parallel to the longitudinal axis of the crawler drive viewed from the machine axis at a distance of at most ¼ of a correspondingly measured wheel distance between axes of rotation of the front main wheel and the rear main wheel.