# US 2014/0360291 A1 · Equalizing unit of a drive train of a motor vehicle and its construction for loss-minimizing oiling on demand > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0360291 A1 - Document ID: US20140360291A1 - Status: Published application - Kind: A1 - Application number: 14/466,331 - Filed: 2014-08-22 - Published: 2014-12-11 - Earliest claimed: 2010-08-03 - Assignees: GKN Driveline Koping AB - Applicants: GKN Driveline Koping AB - Inventors: Hans-Peter Nett; Christoph Gottert; Michael Mullers; Jan Haupt - Web page: https://patentgrep.com/patent/US20140360291A1 ## CPC - B60K 25/06: from the transmission power take-off - F16H 57/0409: {characterised by increasing efficiency, e.g. by reducing splash losses} - F16H 57/0423: {Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes} - F16H 57/0427: {on rotary parts, e.g. using baffles for collecting lubricant by centrifugal force} - F16H 57/0457: {Splash lubrication} - F16H 57/0473: {Friction devices, e.g. clutches or brakes} - F16H 57/0483: {Axle or inter-axle differentials} - B60K 17/34: for driving both front and rear wheels, e.g. four wheel drive vehicles - F16H 48/19: consisting of two linked clutches - F16H 57/0424: {Lubricant guiding means in the wall of or integrated with the casing, e.g. grooves, channels, holes} - F16H 57/0471: {Bearing} - F16H 2048/385: {of the ring or crown gear} - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - F16H: GEARING ## Abstract An equalizing unit of a drive train of a motor vehicle includes 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 an 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 which the oil delivery device can be deactivated if there is no oil requirement. ## Claims ### Claim at position 1 -12. (canceled) ### Claim 13 A power takeoff unit for a powertrain of a vehicle including a permanently powered primary part for powering primary powered wheels of the vehicle and a secondary part for powering secondary powered wheels, the power takeoff unit comprising: a first member configured to rotationally engage the primary part; a second member connectable with the first member and configured to rotationally engage the secondary part; and a braking device for decelerating the second member when the second member is disconnected from the first member. ### Claim 14 (depends on 13) The power takeoff unit as set forth in claim 13 further comprising a synchronizing device for connecting the first member and the second member. ### Claim 15 (depends on 14) The power takeoff unit as set forth in claim 14 wherein the braking device includes a sliding sleeve of the synchronizing device and contacts a fixed part through a striking surface to create a braking torque for the deceleration of the second member. ### Claim 16 (depends on 15) The power takeoff unit as set forth in claim 15 wherein the sliding sleeve braces against a selector fork of the synchronizing device for the creation of frictional torque. ### Claim 17 (depends on 13) The power takeoff unit as set forth in claim 13 wherein the fixed part is a bearing block. ### Claim 18 (depends on 13) The power takeoff unit as set forth in claim 13 wherein the first member is a ring and the second member is a guide sleeve. ### Claim 19 A power takeoff unit for a powertrain of a vehicle including a permanently powered primary part for powering primary powered wheels of the vehicle and a secondary part for powering secondary powered wheels, the power takeoff unit comprising: a first member for being rotationally engaged with the primary part; a second member for being rotationally engaged with the secondary part; a synchronizing device engaged with the second member and movable between a position disengaged with the first member and a position engaged with the first member; and a friction surface between the synchronizing device and a rotationally fixed component for braking the second member when the synchronizing device is disengaged with the first member. ### Claim 20 (depends on 19) The power takeoff unit as set forth in claim 19 wherein the synchronizing device includes a sliding sleeve slideably supported on the second member for slideably engaging the first member. ### Claim 21 (depends on 20) The power takeoff unit as set forth in claim 20 wherein the rotationally fixed component presents the friction surface engaging the sliding sleeve when the synchronizing device is disengaged with the first member. ### Claim 22 (depends on 21) The power takeoff unit as set forth in claim 21 wherein the rotationally fixed component is a bearing block disposed axially adjacent the sliding sleeve. ### Claim 23 (depends on 20) The power takeoff unit as set forth in claim 20 wherein the sliding sleeve presents the friction surface. ### Claim 24 (depends on 23) The power takeoff unit as set forth in claim 23 wherein the rotationally fixed component is a bearing block disposed axially adjacent the sliding sleeve. ### Claim 25 (depends on 20) The power takeoff unit as set forth in claim 20 wherein the rotationally fixed component is a shifting fork of the synchronizing device engaged with the sliding sleeve for sliding the sliding sleeve along the second member. ### Claim 26 (depends on 25) The power takeoff unit as set forth in claim 25 wherein the shifting fork presents the friction surface. ### Claim 27 (depends on 25) The power takeoff unit as set forth in claim 25 wherein the sliding sleeve presents the friction surface. ### Claim 28 (depends on 25) The power takeoff unit as set forth in claim 25 further comprising a bearing block axially adjacent the sliding sleeve and rotationally fixed relative to the second member, a second friction surface being disposed between the bearing block and the sliding sleeve. ### Claim 29 (depends on 28) The power takeoff unit as set forth in claim 28 wherein the bearing block presents the second friction surface. ### Claim 30 (depends on 28) The power takeoff unit as set forth in claim 28 wherein the sliding sleeve presents the second friction surface. ### Claim 31 (depends on 19) The power takeoff unit as set forth in claim 19 wherein the first member is a driving ring and the second member is a guiding sleeve.