Patent ID: 7993205
Filing Date: 2011-08-09
Classification: F16D

Abstract:
1. A coupling for limiting torque in a drive line for driving agricultural implements comprising: a coupling hub; a coupling sleeve rotatably arranged around the coupling hub, said coupling sleeve has an inner circumferential face and the coupling hub and the coupling sleeve are rotatable around a rotational axis; a plurality of drivers, each driver displaceable in the coupling hub along a respective independent driver axis arranged transversally to the rotational axis, the drivers are displaceable between a torque transmitting position and a switched-off position, the drivers further have a first locking face and a second locking face; recesses are in the inner circumferential face of the coupling sleeve, the drivers engage the recesses in their torque transmitting position, and the recesses have a first counter locking face and a second counter locking face wherein, in the torque transmitting position of the drivers, for the torque transmission in a first rotational direction, the first locking face is supported on the first counter locking face and for torque transmission in a second rotational direction, the second locking face is supported on the second counter face; a setting mechanism acts upon the drivers with a force to enable the drivers to take-up their torque transmitting position; wherein each driver has two ratchet faces and each recess has two counter ratchet faces, when the coupling is switched-off in each rotational direction of the coupling hub relative to the coupling sleeve, with a number of relative revolutions in excess of a re-switching-on number of revolutions, a ratchet face and a counter ratchet face interact such that a displacement of the drivers into the torque transmitting position is prevented; wherein the ratchet faces of a respective driver is arranged with a larger radial distance to the rotational axis than the locking faces; wherein the ratchet faces enclose an angle of 35° to 55° with the center axis; and wherein the counter ratchet faces enclose an angle of 35° to 55° with the center axis of the respective recess.