All-wheel distributor gearbox for a motor vehicle

• US 20040018908A1
• Filed: 05/05/2003
• Published: 01/29/2004
• Est. Priority Date: 11/23/2000
• Status: Active Grant

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Gumpoltsberger, Gerhard, Ebenhoch, Michael, Baasch, Detlef, Schmohl, Barbara, Gazyakan, Unal
• Granted Patent: US 6,783,475 B2
• Time in Patent Office: Days
• US Class Current: 475/210
• CPC Class Codes: B60K 17/3462 with means for changing distribution of torque between front and rear wheels
• CPC Class Codes: B60K 17/3467 combined with a change speed gearing, e.g. range gear

Abstract

An all-wheel distributor transmission (1) is described for a motor vehicle comprising a planetary gear set as multiplication step (2) for a switchable off-road gear and a planetary gear set (3) with variable division for distributing a drive torque onto a front axle and a rear axle. The all-wheel distributor transmission (1) also has an adjustable lock (4) for locking between the front axle and the rear axle, the lock (4) and the multiplication step (2) being actuatable via a controllable drive device (5). The drive device (5) comprises a drive shaft (6) and two output shafts (7, 8), the first output shaft (7) being in operative connection with the multiplication step (2) and the second output shaft (8) being in operative connection with the lock (4). A torque introduced via the drive shaft (6) can be applied on the first or the second output shaft (7 or 8) according to a control of a shift unit (10) for actuating the lock (4) or the multiplication step (2).

Claims

1. All-wheel distributor transmission for a motor vehicle comprising a planetary gear set as multiplication step for a switchable off-road gear, a planetary gear set with variable division for distribution of a drive torque onto a front axle and a rear axle and a controllable lock to lock between the front axle and the rear axle, the lock and the multiplication step being actuatable via a controllable drive device, characterized in that said drive device (5) comprises one drive shaft (6) and two output shaft (7, 8), the first output shaft (7) being operatively connected with said multiplication step (2) and the second output shaft (8) being operatively connected with said lock (4), and it being possible, depending on a control of a shift unit (10) for controlling said lock (4) or said multiplication step (2), to bring a torque fed via said drive shaft (6) to the first or the second output shaft (7 or 8).

2. All-wheel distributor transmission according to claim 1, characterized in that said shift unit (10) has an electromagnetic clutch (30) with which can be produced a power flow between said drive shaft (6) and said first or second output shaft (7 or 8).

3. All-wheel distributor transmission according to claim 1 or 2, characterized in that said lock (4) and said multiplication step (2) can be driven by said drive device (5) sequentially translatorily and can be kept in one position.

4. All-wheel distributor transmission according to any one of claims 1 to 3, characterized in that in the area of its end remote from said drive shaft (6), said first output shaft (7) is in operative connection with a linear drive (11).

5. All-wheel distributor transmission according to claim 4, characterized in that said linear drive ( 11) comprises one ball-threaded pinion (12) and one tiltable driver (13), said ball-threaded pinion (12) comprising a ball nut (15) in operative connection with said first output shaft (7) and having several balls (14) and which, during a rotation of said first output shaft (7), is adjusted in axial direction of said first output shaft (7) and produces a tiltable motion of said driver (13).

6. All-wheel distributor transmission according to claim 5, characterized in that said driver (13) is tiltably supported in a housing (16) of said all-wheel distributor transmission (1) and connected with a synchronizer unit (17) in a manner such that a tilting motion of said driver (13) produces an actuation of said multiplication step (2).

7. All-wheel distributor transmission according to any one of claims 1 to 6, characterized in that on its end remote from said output shaft (6), said second output shaft (8) is connected with said lock (4) via a multiplication device (18).

8. All-wheel distributor transmission according to any one of claims 1 to 7, characterized in that said lock (4) has several axially movable discs (25, 27), the inner discs (25) of said lock (4) being non-rotatably connected with a rear-wheel output shaft (28) of said all-wheel distributor transmission (1) and outer discs (27) of said lock (4) being non-rotatably connected with a front-wheel output shaft (26) of said all-wheel distributor transmission (1).

9. All-wheel distributor transmission according to claim 8, characterized in that to adjust said lock (4) there are provided one set wheel (23) and between said disc sets (25, 27) and said set wheel (23) one adjusting element (29) axially movable and non-rotatably situated in said housing (16) of said all-wheel distributor transmission (1), said adjusting element (29) having on its side facing said set wheel (23) at least one groove (29A) for accommodating rolling bodies (61) which corresponds with at least one recess (23A) upon the side of said set wheel (23) facing said adjusting element (29) in a manner such as to produce a rolling of said rolling bodies (61) and an axial motion of said adjusting element (29).

10. All-wheel distributor transmission according to any one of claim 7 to 9, characterized in that said multiplication device (18) has two gear wheels (20, 21) fixedly connected with a shaft (19) and rotatably situated in said housing (16), said first gear wheel (20) being engaged with a spur gear (22) firmly connected with said second output shaft (8).

11. All-wheel distributor transmission according to any one of claims 9 or 10, characterized in that said lock (4), for producing the operative connection with said second output shaft (8), is provided with a spline (24) extending at least partly over the periphery of said set wheel (23).

12. All-wheel distributor transmission according to claim 10 or 11, characterized in that said second gear wheel (21) of said shaft (19) is engaged with said spline (24) of said set wheel (24).

13. All-wheel distributor transmission according to any one of claims 2 to 12, characterized in that said electromagnetic clutch (30) has an axially and rotatorily movably guided coupling element (31) which is non-rotatably connected with said drive shaft (6) and depending on a current supply of said electromagnetic clutch (30) produces the power flow between said drive shaft (6) and said first or second output shaft (7 or 8).

14. All-wheel distributor transmission according to claim 13, characterized in that said drive shaft (6) has in the area of its end facing said output shafts (7, 8) a flange-like collar (34) on which is fastened a resilient element (35) of said coupling element (31).

15. All-wheel distributor transmission according to claim 13 or 14, characterized in that said second output shaft (8) is designed as hollow shaft surrounding said first output shaft (7) and on its end facing said drive shaft (6) can be brought to operative connection with said coupling element (31) so that a non-rotatable connection exists between said drive shaft (6) and said second output shaft (8) when said electromagnetic clutch (30) is currentless when the connection between said drive shaft (6) and said first output shaft (7) is released.

16. All-wheel distributor transmission according to any one of claims 13 to 15, characterized in that said first output shaft (7) has in the area of its end facing said drive shaft (6) a collar (45) with which, in current-supplied state of said electromagnetic clutch (30) contacts said coupling element (31) so that a non-rotatable connection exists between said drive shaft (6) and said first output shaft (7), the connection between said drive shaft (6) and said second output shaft (8) then being released.

17. All-wheel distributor transmission according to claim 15 or 16, characterized in that, to form the non-rotatable connection between said drive shaft (16) and said first or second output shaft (7 or 8), a form-locking or force-locking connection is respectively provided.

18. All-wheel distributor transmission according to any one of claims 1 to 17, characterized in that, to unload said drive device (5), in the area of said drive shaft (6) an electromagnetic brake (16) is provided with which said drive shaft (6) is non-rotatably retained in one position depending on a current supply of said electromagnetic brake (16).

19. All-wheel distributor transmission according to claim 18, characterized in that said electromagnetic brake (46) comprises a brake element (5) non-rotatably with said drive shaft (6) and movable in axial direction of said drive shaft (6) which in current-supplied state of said electromagnetic brake (46) forms a power flow between said drive shaft (6) and said electromagnetic brake (46).