Equalizing unit of a drive train of a motor vehicle and its construction for loss-minimizing oiling on demand

• US 20120031727A1
• Filed: 08/01/2011
• Published: 02/09/2012
• Est. Priority Date: 08/03/2010
• Status: Active Grant

• Current Assignee: GKN Driveline Köping AB (Melrose Industries Plc)
• Original Assignee: Getrag All Wheel Drive AB
• Inventors: NETT, Hans-Peter, Göttert, Christoph, Müllers, Michael, Haupt, Jan
• Granted Patent: US 8,845,473 B2
• Time in Patent Office: Days
• US Class Current: 192/113.1
• CPC Class Codes: B60K 17/34 for driving both front and rear wheels, e.g. four wheel drive vehicles arrangement or mounting of control devices for changing number of driven wheels B60K23/08
• CPC Class Codes: B60K 25/06 from the transmission power take-off transmissions having power-take-off B60K17/28
• CPC Class Codes: F16H 2048/385 of the ring or crown gear
• CPC Class Codes: F16H 48/19 consisting of two linked clutches
• CPC Class Codes: F16H 57/0409 characterised by the problem to increase efficiency, e.g. by reducing splash losses
• CPC Class Codes: F16H 57/0423 Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes means for guiding lubricant into an axial channel of a shaft F16H57/0426; lubrication by injection, injection nozzles or tubes therefore F16H57/0456
• CPC Class Codes: F16H 57/0424 Lubricant guiding means in the wall of or integrated with the casing, e.g. grooves, channels, holes means for guiding lubricant into an axial channel of a shaft F16H57/0426
• CPC Class Codes: F16H 57/0427 on rotary parts, e.g. using baffles for collecting lubricant by centrifugal force
• CPC Class Codes: F16H 57/0457 Splash lubrication characterised by the problem reducing losses, e.g. splash losses F16H57/0409
• CPC Class Codes: F16H 57/0471 Bearing
• CPC Class Codes: F16H 57/0473 Friction devices, e.g. clutches or brakes
• CPC Class Codes: F16H 57/0483 Axle or inter-axle differentials

Abstract

The invention relates to an oiling concept of an equalizing unit of a drive train of a motor vehicle with a clutch device to be oiled in driving mode. In order to stop drag torques which act on the clutch device from the outside and result in increased dissipation when said clutch device is not required due to the operating state, measures are provided which promote the dry running of the clutch device. The measures include the spatial-functional separation of the oil delivery device from the clutch device and the provision of a braking or decoupling device by means of which the oil delivery device can be deactivated if there is no oil requirement.

Claims

1. The invention relates to an equalizing unit of a drive train of a motor vehicle with drive members comprising an input shaft and at least one first output shaft, wherein the first output shaft can be coupled to a second output shaft or to the input shaft or to an intermediate shaft driven by the input shaft via a clutch device, which is to be supplied with oil via a delivery device directly or indirectly driven via the drive members, wherein the delivery device is formed by an oil delivery wheel arranged distant from the clutch device.

2. The equalizing unit according to claim 1, wherein the oil delivery wheel is designed in such a manner that it is capable of delivering the oil from an oil sump with an oil level located below the clutch device.

3. The equalizing unit according to claim 1, wherein the oil delivery wheel is formed by a crown wheel arranged on the intermediate shaft.

4. The equalizing unit according to claim 1, wherein the oil delivery wheel comprises a crown wheel arranged on the intermediate shaft, wherein the crown wheel is radially expanded to the outside by an oil delivery ring.

5. The equalizing unit according to claim 1, wherein on the inside of the housing at least part-circumferential bulkheads are provided which during the oil delivery process minimize the lateral outflow of the oil taken along by the oil delivery wheel.

6. The equalizing unit according to claim 1, wherein a braking or decoupling device is provided, by means of which the oil delivery wheel can be deactivated if there is no oiling requirement for the clutch device.

7. The equalizing unit according to claim 6, wherein the braking device comprises a sliding sleeve of a synchronizing device which interacts with a fixed part of the motor vehicle via a friction surface and is capable of generating a braking torque for braking the drive members to be deactivated.

8. The equalizing unit according to claim 7, wherein the sliding sleeve for generating the friction torque supports itself against a bearing block.

9. The equalizing unit according to claim 7, wherein the sliding sleeve for generating the friction torque supports itself against a shifting fork of the synchronizing device.

10. A construction of a drive train for a motor vehicle, wherein the drive train comprises an equalizing unit with drive members, particularly an equalizing unit according to claim 1, wherein the drive members comprise an input shaft and at least one first output shaft, wherein the first output shaft can be coupled to a second output shaft or to the input shaft or to an intermediate shaft driven by the input shaft via a clutch device to be oiled, which via a delivery device directly or indirectly driven via the drive members is to be supplied with oil, wherein in the drive train a braking or clutch device is provided, by means of which the delivery device can be braked if there is no oiling requirement for the clutch device.

11. The construction of a drive train for a motor vehicle, particularly with an equalizing unit according to claim 1, wherein the drive train comprises a permanently driven primary part for the permanent driving of primary drive wheels and a secondary part for the driving of secondary drive wheels, wherein the secondary part if required can be decoupled from or connected to the primary part and the secondary drive wheels, wherein a braking device is provided by means of which the secondary part in the state decoupled from the primary part can be braked.

12. A drive train construction according to claim 11, wherein in the secondary part at least one clutch device is provided, whose at least one clutch side is dragged via the secondary axle drive wheels which in vehicle operation roll even with decoupled secondary part and which with connected secondary part is to be supplied with oil via a delivery device directly or indirectly driven via drive members of the secondary part.