Controlled collapsible drive line arrangement
A collapsible torque transfer shaft arrangement for a motor vehicle powertrain is provided. The collapsible shaft arrangement includes an axially translatable coupling mechanism that allows drive line drive shaft members to telescopically collapse while maintaining a non-rotateable connection among the respective drive shaft members. The coupling mechanism also includes a locking pin arranged in the coupling mechanism such that axial connectivity of the respective drive shaft members is maintained below a predetermined force threshold irrespective of other drive line power train components.
1 . A collapsible torque transfer shaft arrangement for a motor vehicle powertrain, the shaft arrangement comprising:
a first shaft member coupled to a transmission;
a second shaft member coupled to a torque distribution mechanism for distributing torque to a drive wheel;
an axially translatable coupling mechanism arranged to slideably couple the first and second shaft members in an axial direction such that the shaft members can not rotate relative to each other, and
a pin member positioned in the coupling mechanism and arranged to engage the drive shaft members to allow axial movement of the shaft members relative to each other in response to a predetermined axial force being placed on at least one of the shaft members.
2 . The torque transfer shaft arrangement of claim 1 , wherein the coupling mechanism is permanently connected to an end of the first shaft member and arranged to couple the first and second shaft members.
3 . The torque transfer shaft arrangement of claim 2 , wherein the second shaft member has an externally splined portion with splines extending radially outwardly from a central axis and the coupling mechanism has an internally splined portion with splines extending radially inwardly toward a central axis, the coupling mechanism arranged to couple the first and second shaft members in a non-rotateable connection.
4 . The torque transfer shaft arrangement of claim 3 , wherein in an assembled configuration, the coupling mechanism and the second shaft member have coinciding bores in their respective splined portions, the coinciding bores arranged to receive the pin member in a press-fit configuration.
5 . The torque transfer shaft arrangement of claim 1 , wherein the pin member further comprises a predetermined shear strength threshold, the pin arranged to shear and allow the drive shafts to telescopically collapse when the pin member is exposed to a force greater than the predetermined shear threshold.
6 . The torque transfer shaft of claim 1 , wherein the pin member further comprises a shear rivet.