Drivetrain for a vehicle

1 . A drivetrain for vehicles, comprising:

a frame;

a first driving line supported by said frame and connectable to a first torque transfer element;

a second driving line supported by said frame and connectable to a second torque transfer element;

at least an intermediate element directly interposed between the first driving line and the second driving line;

inner auxiliary bearings located in proximity of proximal ends of a first transfer shaft of the first driving line and/or a second transfer shaft of the second driving line within a mutual proximity area; and

outer auxiliary bearings located in correspondence of opposite ends of the first transfer shaft and/or the second transfer shaft with respect to shafts' ends residing in the mutual proximity area,

wherein said intermediate element is adapted to share and transmit one or more of the following:

axial loads active in the first driving line into the second driving line;

axial loads active in the second driving line into the first driving line; and

axial loads active into the first and/or second driving line into the frame,

wherein said intermediate element, the second driving line and the first driving line are operatively interconnected so that axial loads mutually exchanged between the intermediate element, the second driving line and the first driving line are cancelled out to a minimum common value, through the intermediate element itself;

wherein the intermediate element comprises a bearing which allows relative rotational speed between shafts belonging to the first driving line and the second driving line;

wherein said intermediate element is residing in the mutual proximity area defined in correspondence of a central plane of the frame, said central plane comprising at least a central supporting member and defining a first half-space and a second half-space opposite to said first half-space with respect to said central plane, each of said first and second half-spaces respectively housing the first driving line and the second driving line;

wherein the first transfer shaft belongs to the first driving line;

wherein the second transfer shaft belongs to the second driving line, said first and second transfer shafts being mutually facing each other in correspondence of the mutual proximity area, the intermediate element being directly interposed between said first transfer shaft and said second transfer shaft;

wherein the first transfer shaft includes a first end face, and the second transfer shaft includes a second end face facing the first end face, wherein the intermediate element is positioned between the first transfer shaft and the second transfer shaft such that the intermediate element remains in direct contact with each of the first end face and the second end face;

wherein the drivetrain further comprises a central bushing cooperating at least with said intermediate element, said central bushing having two mutually opposite first and second ends respectively interfaced with the proximal end of the first transfer shaft and to the proximal end of the second transfer shaft, said proximal ends of the first and second transfer shafts being located in the mutual proximity area;

wherein the first end of the central bushing is interfaced with the proximal end of the first transfer shaft; and

wherein the second end of the central bushing is integrally engaged with the proximal end of the second transfer shaft.

2 . The drivetrain as claimed in claim 1 , further comprising a second intermediate element interposed between one or more of:

the first end of the central bushing and the proximal end of the first transfer shaft; and

the second end of the central bushing and the proximal end of the second transfer shaft.

3 . The drivetrain as claimed in claim 2 , wherein said central bushing having the first end and the second end is interfaced with the proximal end of the first transfer shaft and also interfaced with the proximal end of the second transfer shaft while maintaining an axial constraint between the two transfer shafts.

4 . The drivetrain as claimed in claim 3 , further comprising retainers coaxially mounted on the central bushing and located between the first end or the second end of the central bushing, the second end and the proximal end of the first or the second transfer shaft.

5 . The drivetrain as claimed in claim 4 , further comprising a predetermined number of bearing fixation elements interposed between the frame and the intermediate element and/or the central bushing and/or the inner auxiliary bearings and/or the outer auxiliary bearings.

6 . The drivetrain as claimed in claim 5 , further comprising axial pre-loading structure cooperatively active on one or more of the following:

the intermediate element;

the central bushing;

the second intermediate element;

one or more of said inner auxiliary bearings; and

one or more of said outer auxiliary bearings.

7 . A drivetrain for vehicles, the drivetrain comprising:

a frame, having a central plane dividing the frame between a first half-space and a second half-space mutually opposite to the first half-space; and

a first driving line supported by said frame, housed within the first half-space and connectable to a first torque transfer element, the first driving line having a first transfer shaft;

a second driving line supported by said frame, housed within the second half-space and connectable to a second torque transfer element, the second driving line having a second transfer shaft, wherein the first and second transfer shafts being mutually facing each other; and

at least an intermediate element directly interposed between the first and second transfer shafts, such that the intermediate element remains in direct contact with each of a first end face of the first transfer shaft and the second end face of the second transfer shaft, whereby axial forces from first transfer shaft and from the second transfer shaft are cancelled out by the intermediate element;

wherein said intermediate element is adapted to share and transmit one or more of the following:

axial loads active in the first driving line into the second driving line;

axial loads active in the second driving line into the first driving line; and

axial loads active into the first and/or second driving line into the frame;

wherein said intermediate element, the second driving line and the first driving line are operatively interconnected so that axial loads mutually exchanged between the intermediate element, the second driving line and the first driving line are cancelled out to a minimum common value, through the intermediate element itself;

wherein the intermediate element comprises a bearing which allows relative rotational speed between shafts belonging to the first driving line and the second driving line;

wherein said intermediate element is residing in the mutual proximity area defined in correspondence of a central plane of the frame, said central plane comprising at least a central supporting member and defining a first half-space and a second half-space opposite to said first half-space with respect to said central plane, each of said first and second half-spaces respectively housing the first driving line and the second driving line;

wherein the first transfer shaft belongs to the first driving line;

wherein the second transfer shaft belongs to the second driving line, said first and second transfer shafts being mutually facing each other in correspondence of the mutual proximity area, the intermediate element being directly interposed between said first transfer shaft and said second transfer shaft;

wherein the first transfer shaft includes a first end face, and the second transfer shaft includes a second end face facing the first end face, wherein the intermediate element is positioned between the first transfer shaft and the second transfer shaft such that the intermediate element remains in direct contact with each of the first end face and the second end face;

wherein the drivetrain further comprises a central bushing cooperating at least with said intermediate element, said central bushing having two mutually opposite first and second ends respectively interfaced with the proximal end of the first transfer shaft and to the proximal end of the second transfer shaft, said proximal ends of the first and second transfer shafts being located in the mutual proximity area;

wherein the first end of the central bushing is interfaced with the proximal end of the first transfer shaft; and

wherein the second end of the central bushing is integrally engaged with the proximal end of the second transfer shaft.

8 . The drivetrain as claimed in claim 7 , further comprising inner auxiliary bearings located in proximity of the proximal ends of the first and/or the second transfer shafts within the mutual proximity area.

9 . The drivetrain as claimed in claim 8 , further comprising outer auxiliary bearings located in correspondence of opposite ends of the first transfer shaft and/or the second transfer shaft with respect to shafts' ends residing in the mutual proximity area.

10 . The drivetrain as claimed in claim 7 , wherein a seating is provided on at least one of the first transfer shaft and the second transfer shaft, within the mutual proximity area.

11 . The drivetrain as claimed in claim 10 , wherein the seating is counter-shaped to the intermediate element to accommodate the intermediate element therein.