AUXILIARY POWER TAKE-OFF ASSEMBLY

Abstract

An auxiliary power take-off assembly (32) for a transmission (6) of a motor vehicle (2) having a torque converter (8). A driveshaft (30) is permanently connected to a drive motor (4), via the pump shaft (24) of the torque converter (8). In addition, the auxiliary power take-off assembly (32) has a transmission drive chain which includes at least a drive input element (34) and a drive output element (42) connected to an additional assembly (66) to be driven, and a shifting element (64, 68). The shifting element (64, 68) is functionally arranged between the driveshaft (30) and the drive input element (34) of the transmission chain for the optionally connecting the driveshaft (30) to the drive input element (34).

Claims

1-10. (canceled)

11. An auxiliary power take-off assembly (32) for a transmission (6) of a motor vehicle (2) comprising: a torque converter (8) having a driveshaft (30) permanently connected to a drive motor (4) via a pump shaft (24) of the torque converter (8), and a transmission chain having at least one of a drive input element (34) and a drive output element (42), the drive output element (42) being connected to an additional assembly (66) to be driven, and a shifting element (64, 68), and the shifting element (64, 68) being functionally connected between the driveshaft (30) and the drive input element (34) of the transmission chain for an optional connection of the driveshaft (30) to the drive input element (34).

12. The auxiliary power take-off assembly (32) according to claim 11, wherein the drive input element (34) in the transmission chain and the driveshaft have a common rotational axis (72).

13. The auxiliary power take-off assembly (32) according to claim 11, wherein the drive input element (34) of the transmission chain is a gearwheel of a gearwheel chain.

14. The auxiliary power take-off assembly (32) according to claim 11, wherein the drive input element of the transmission chain is a wheel of a wrap-around drive.

15. The auxiliary power take-off assembly (32) according to claim 11, wherein the shifting element (64, 68) is actuated by one of a pneumatic, hydraulic, electric motor and electromagnetic means.

16. The auxiliary power take-off assembly (32) according to claim 15, wherein the shifting element (64, 68) is hydraulically actuated by hydraulic fluid which is delivered to the shifting element (68) through the driveshaft (30).

17. The auxiliary power take-off assembly (32) according to claim 15, wherein the shifting element (64, 68) is hydraulically actuated, and the shifting element (64, 68) is hydraulically connected to a control unit of the transmission (6) of the motor vehicle (2).

18. The auxiliary power take-off assembly (32) according to claim 11, wherein the shifting element (64, 68) is one of a claw shifting element, a cone synchronizer and a frictional shifting element (52, 54, 56).

19. The auxiliary power take-off assembly (32) according to claim 11, wherein the shifting element (64, 68) is a claw shifting element and the claw shifting element has claws on end faces thereof.

20. The auxiliary power take-off assembly (32) according to claim 18, wherein the shifting element (64, 68) is a claw shifting element and the claw shifting element is arranged in a shifting sleeve.

21. An auxiliary power take-off assembly for a transmission of a motor vehicle having a torque converter, the auxiliary power take-off assembly comprising: a driveshaft being connected in a rotationally fixed manner, via a pump shaft of the torque converter, to a drive motor; a transmission drive chain comprising a drive input element and a drive output element, and the drive output element being connected to an additional assembly to be driven; and a shifting element being connectable between the driveshaft and the drive input element for transmitting drive from the driveshaft to the drive input element of the transmission drive chain to facilitate driving of the additional assembly to be driven.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The invention is described in greater detail with reference to drawings, which show:

[0020] FIG. 1: A schematic representation of a vehicle

[0021] FIG. 2: A transmission of a vehicle with an auxiliary power take-off assembly

[0022] FIG. 3: A first schematic representation of a shifting element

[0023] FIG. 4: A second schematic representation of a shifting element

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] FIG. 1 shows a schematic vehicle representation of a motor vehicle 2 comprising a drive motor 4, a transmission 6 and a torque converter 8 arranged between the drive motor 4 and the transmission 6. The transmission 6 is connected by way of a drive output shaft 10 and a differential 12 to the two rear wheels 14.

[0025] FIG. 2 shows an automatic transmission 6 with a torque converter 8, designed according to the prior art. In a transmission housing 16, a bridging clutch 20 is provided between the output shaft 18 of the drive motor 4 and the torque converter 8 and can connect the output shaft 18 to the transmission input shaft 22 in order to bridge across the torque converter 8. The output shaft 18 is connected via the pump wheel P of the torque converter 8 to the pump shaft 24. The turbine wheel T of the torque converter 8 is permanently connected to the transmission input shaft 22. The guide wheel L of the torque converter 8 is attached to the housing 16 by way of a freewheel 26. Projecting out of the transmission 6 is the output shaft 28, which is connected to the drive output shaft 10 (FIG. 1).

[0026] Connected to the pump shaft 24 is the drive input shaft 30 of the auxiliary power take-off assembly 32. In FIG. 2 the drive element 34 of the auxiliary power take-off assembly 32 is connected directly to the drive input shaft 30. The drive input element 34 serves on the one hand to drive a lubricant pump 36 via the gearwheel 38. On the other hand, via the drive input element 34 the intermediate wheel 40 of the auxiliary power take-off assembly 32 is turned, which in turn drives the drive output element 42 of the auxiliary power take-off assembly 32. Connected to the drive output element 42 is a shifting element 44 which optionally connects the drive output element 42 to the drive output shaft 46. In this arrangement the components always rotate along with the output shaft 18 of the drive motor 4 as far as the drive output element 42.

[0027] FIG. 3 shows a first embodiment of the invention, represented schematically. The same components as in FIG. 2 are given the same indexes. In the transmission housing 16 the pump shaft 24 is connected to the drive motor via a torsion damper 48. Connected to the pump shaft 24 is the driveshaft 30, on which the drive input element 34 of the auxiliary power take-off assembly 32 is mounted to rotate, for example in a needle bearing 50. The drive input element 34 has a friction disk carrier 52 on which at least one inner friction disk 54 is provided. The at least one friction disk 54 can be brought into torque-transmitting contact with at least one outer friction disk 56 on the driveshaft 30, in that the piston 58 presses the friction disk 54 against the friction disk 56. The rotational speed difference relative to the transmission housing 16 is compensated for by means of an axial bearing. The piston 58 is actuated by a hydraulically or pneumatically applied pressure, represented by the arrow 60, which pressure is built up in the piston chamber 62. The pressure is admitted from the inside of the transmission 6 through the transmission housing 16.

[0028] The essential elements of the shifting element 64 consist of the friction disk carrier 52, the friction disks 54 and 56 and the actuating piston 58. The intermediate wheel 40 in the auxiliary power take-off assembly 32 meshes with the drive input element 34, which wheel 40 in turn meshes with the drive output element 42. The additional assembly 66 to be driven is connected directly to the drive output element 42.

[0029] By means of the shifting element 64, the drive input element 34 can be decoupled from the driveshaft 30. Then, in the decoupled condition the components of the auxiliary power take-off assembly 32 and the additional assembly 66 are no longer driven and no longer rotate with the driveshaft 30. Noise and losses of the otherwise driven and rotating elements no longer occur.

[0030] The shifting element 64 and the driveshaft 30 rotate about the same rotational axis 72.

[0031] FIG. 4 shows a second embodiment of the invention, in which a modified shifting element 68 is provided. The other components correspond essentially to the components described in FIG. 3. In this case too a friction disk carrier 52 is built onto the drive input element 34, which carrier has at least one inner friction disk 54. Here, two outer friction disks 56 are provided, arranged on either side of the inner friction disk 54. When actuated the piston 58 presses the friction disks 54 and 56 together and thereby transmits torque between the driveshaft 30 and the drive input element 34. For the actuation of the piston 58 in this case pneumatic or hydraulic actuating media is delivered through the driveshaft 30 into the piston chamber 62, as indicated by the arrow 70.

INDEXES

[0032] 2 Motor vehicle [0033] 4 Drive motor [0034] 6 Transmission [0035] 8 Torque converter [0036] 10 Drive output shaft [0037] 12 Differential [0038] 14 Rear wheel [0039] 16 Transmission housing [0040] 18 Output shaft [0041] 20 Bridging clutch [0042] 22 Transmission input shaft [0043] 24 Pump shaft [0044] 26 Freewheel [0045] 28 Output shaft [0046] 30 Driveshaft [0047] 32 Auxiliary power take-off assembly [0048] 34 Drive input element [0049] 36 Lubricant pump [0050] 38 Gearwheel [0051] 40 Intermediate wheel [0052] 42 Drive output element [0053] 44 Shifting element [0054] 46 Drive output shaft [0055] 48 Torsion damper [0056] 50 Needle bearing [0057] 52 Friction disk carrier [0058] 54 Friction disk [0059] 56 Friction disk [0060] 58 Piston [0061] 60 Arrow [0062] 62 Piston chamber [0063] 64 Shifting element [0064] 66 Additional assembly [0065] 68 Shifting element [0066] 70 Arrow [0067] 72 Rotational axis [0068] P Pump wheel [0069] T Turbine wheel [0070] L Guide wheel