Patent ID: 6196924
Filing Date: 2001-03-06
Classification: A01B,F16D

Abstract:
A torque limiting coupling for a driveline for driving agricultural implements, comprising:a coupling hub having first recesses starting from a cylindrical outer face, said recesses being distributed around and extending parallel to a longitudinal axis, and second recesses in said coupling hub extending at right angles relative to said first recesses, said second recesses being open towards said outer face and extending towards the first recesses;a coupling sleeve having a bore arranged coaxially around said coupling hub, said bore having grooves with a supporting face, said grooves being distributed to correspond to the first recesses and extend parallel to the longitudinal axis;driving members, in the form of oblong slides, being adjustably positioned in said first recess, torque transmitting faces are on said driving members, said torque transmitting faces being supported on the supporting face of said grooves in a torque transmitting position, said driving members on their radial inside include at least one first switching face;at least one spring-loaded switching cam per driving member being displacably arranged in an associated second recess, said switching cam including at least one second switching face positioned towards the first recess and towards the driving member, at least one first switching faces, said at least one second switching face being in contact with said driving member;two covers bridging a space between said coupling hub and said coupling sleeve, said covers being axially secured at the coupling sleeve, said covers accommodating a first portion of the coupling hub, said first portion having the first recesses;seals for sealing the coupling hub, the coupling sleeve and the covers so as to provide oil proofing; andoil at least partially filling the free space between the coupling hub, the coupling sleeve and the covers, oil level in the free space and the viscosity of the oil being selectable to achieve the desired reconnection behavior and with the oil level reaching at least twenty (20%) percent of the free space and the viscosity at least 80 cSt (mm.sup.2 /s) and during disengagement of said driving member said oil preventing re-engagement with said groove until re-engagement speed is achieved.