초록 ▼

The invention relates to a decoupling sleeve having driving and driven shafts connected by dog clutches. The driving shaft transmits torque to the driven shaft in one direction during a forward direction of rotation where a rod-shaped connecting member is connected to two shafts so that the connecti

The invention relates to a decoupling sleeve having driving and driven shafts connected by dog clutches. The driving shaft transmits torque to the driven shaft in one direction during a forward direction of rotation where a rod-shaped connecting member is connected to two shafts so that the connecting member is detached from one of the shafts if subject to a reverse torque beyond a specific threshold. The two shafts become free in rotation relative to one another upon this detachment.

대표청구항 ▼

The invention claimed is: 1. A decoupling sleeve, comprising: a coaxial driven shaft assembly, including: a driven shaft, a threaded nut having a nut thread, the nut being mobile in axial translation relative to the driven shaft and being mobile in rotation to the driven shaft over a limited angle,

The invention claimed is: 1. A decoupling sleeve, comprising: a coaxial driven shaft assembly, including: a driven shaft, a threaded nut having a nut thread, the nut being mobile in axial translation relative to the driven shaft and being mobile in rotation to the driven shaft over a limited angle, and a return spring; a coaxial driving shaft; a set of dog clutch jaws, the dog clutch jaws configured to connect the driving shaft to the driven shaft, and to allow the driving shaft to transmit engine torque to the driven shaft in a forward direction of rotation; and a connecting member having a connecting member thread, the connecting member configured to be connected to the driving shaft, said connecting member adapted to be connected to the driven shaft via a threaded interface to the nut, the threaded interface configured to allow the connecting member to detach from the nut after an event of reverse torque beyond a threshold so that the driven and driving shafts become free in rotation relative to one another, the threaded interface including the nut thread and the connecting member thread, wherein the return spring is configured to exert an axial force on the threaded nut and the driven shaft, and the spring is configured to increase a distance between the nut thread and the connecting member thread when the nut and the connecting member detach after the reverse torque beyond the threshold. 2. The sleeve according to claim 1 of which the connecting member is in the shape of a rod which is coaxial to the two shafts. 3. The sleeve according to claim 2, wherein the rod is connected to the driving shaft via a pin interface which limits axial movement of the rod relative to the driving shaft. 4. The sleeve according to claim 1, of which the driven shaft comprises an axial bore with an opening at one end of the bore, the opening configured to allow insertion and axial movement of the nut and the spring within the bore. 5. The sleeve according to claim 4, wherein the nut includes a surface forming an abutment in rotation, cooperating with a surface forming an abutment attached to the driven shaft. 6. The sleeve according to claim 1, wherein the set of dog clutch jaws include a set of opposing teeth, the opposing teeth include a set of primary tooth surfaces to transmit the torque of the driving shaft to the driven shaft in the forward direction of rotation, and a set of secondary angled tooth surfaces which separate the jaws when the transmitted torque is reversed. 7. The sleeve according to claim 1, wherein the sleeve includes a preferred fracture zone for limiting the torque transmitted in the forward direction of rotation from the driving shaft to the driven shaft. 8. The sleeve according to claim 1, wherein the limited angle is five degrees. 9. A decoupling sleeve, comprising: two shafts including a coaxial driving shaft and a coaxial driven shaft, the two shafts connected by a set of dog clutch jaws by means of which the driving shaft transmits engine torque to the driven shaft in one direction during forward operation; and a connecting member being connected to a first of the two shafts on the one hand and to a second of the two shafts on the other hand such that the connecting member is detached from the first of the two shafts in an event of reverse torque occurring beyond a specific threshold, the two shafts being then free in rotation relative to one another, characterized in that the connecting member is connected by screwing to a nut which is mobile in translation relative to the first of the two shafts against a return spring and mobile in rotation over a limited angle, the connecting member being detached from the first of the two shafts by unscrewing the nut. 10. The sleeve according to claim 9, wherein the first of the two shafts is the driven shaft. 11. The sleeve according to claim 9, wherein the connecting member is in the shape of a rod which is coaxial to the two shafts. 12. The sleeve according to claim 11, wherein the rod is connected to the driven shaft via a pin interface which limits axial movement of the rod relative to the driven shaft. 13. The sleeve according to claim 9, wherein the driving shaft includes an axial bore with an opening at one end of the bore, the opening adapted to allow insertion and axial movement of the nut and the spring within the bore. 14. The sleeve according to claim 13, wherein the nut includes a surface forming an abutment in rotation, cooperating with a surface forming an abutment attached to the driving shaft. 15. The sleeve according to claim 9, wherein the set of dog clutch jaws include a set of opposing teeth, the opposing teeth include a set of primary tooth surfaces to transmit the torque of the driving shaft to the driven shaft in the forward direction of rotation, and a set of secondary angled tooth surfaces which separate the jaws when the transmitted torque is reversed. 16. The sleeve according to claim 9, wherein the sleeve includes a preferred fracture zone for limiting the torque transmitted in the forward direction of rotation from the driving shaft to the driven shaft. 17. The sleeve according to claim 9, wherein the limited angle is five degrees.