Patent ID: 8657092
Filing Date: 2014-02-25
Classification: F16D

Abstract:
1. A safety coupling for the transmission of rotary motion, including: a driving part and a driven part rotatable around a same rotation axis and including, respectively, a first torque transmission device and a second torque transmission device each having front toothings normally meshing with one another to form two parts of a coupling for the transmission of torque; and a torque-sensitive opening device adapted to disengage the front toothings of the first and second torque transmission devices, thus interrupting the torque transmission, when the torque transmitted between the two parts of the coupling exceeds a given maximum torque value, wherein the torque-sensitive opening device includes a pressure chamber filled with an incompressible fluid and a valve device adapted to automatically control the discharge of the fluid from the pressure chamber if a given maximum fluid pressure value is exceeded in the pressure chamber, wherein the pressure of the fluid in the pressure chamber exerts a force on the front toothings of the first and second torque transmission devices to maintain the meshing of the front toothings for the transmission of torque between the two parts of the coupling, and wherein the torque transmitted between the two parts of the coupling through the front toothings of the first and second torque transmission devices produces an increase in pressure of the fluid in the pressure chamber proportional to the torque transmitted, and said maximum torque value is correlated to said maximum fluid pressure value.