Selectable differential
In a differential that is part of a selectively disconnectable or connectable secondary powertrain, a clutch device allows the input member of the differential, via which driving power is introduced into the differential, to be uncoupled from the output members to which the driving power is forwarded in a branched manner in order to be able to completely shut off part of the secondary powertrain in the disconnected state.
1. A differential of a motor vehicle, comprising:
an input member and at least two output members; and
a differential unit that acts in a positive-locking manner and that is arranged between the input member and output members, and via which drive power flow is transmitted from the input member to the output members, and
a clutch device between the input member and the output members, by which the output members and the input member can be decoupled from each other;
wherein there is provided on the differential a braking device which applies a braking force to the input member or to drive train components which are connected to the input member in a rotationally secure manner when the output members are decoupled from the input member.
2. The differential of claim 1 , wherein the differential has an external differential basket that is connected to the input member, and an internal differential basket that receives a differential mechanism.
3. The differential of claim 2 , wherein the differential comprises a synchronization unit that is arranged between the external differential basket and the internal differential basket.
4. The differential of claim 2 , wherein the members are guided exclusively inside the internal differential basket.
5. The differential of claim 2 , wherein the internal differential basket is exclusively supported in at least one of a differential housing and the external differential basket.
6. The differential of claim 2 , wherein the external differential basket is constructed as a laterally open, cup-like differential basket.
7. The differential of claim 2 , wherein the external differential basket is supported in the differential housing via an external lateral edge of the lateral opening.
8. The differential of claim 7 , wherein at least one of the clutch device, a synchronization, a braking device, and an actuator system are located at least partially radially inside a bearing of the external differential basket.
9. The differential of claim 1 , wherein during a connect operation, in which the output members are coupled to the input member in order to transmit drive power, a power flow is ensured from an outer side to an inner side.
10. The differential of claim 1 , wherein there is provided a braking ring that is clamped during braking operation between a secondary drive train component, which is connected to the input member in a rotationally secure manner, and the differential housing.
11. The differential of claim 9 , wherein a braking device has at least one pairing of braking faces which act against each other in a frictionally engaging manner, wherein the braking faces form a frustoconical surface or constitute portions of a single frustoconical surface.
12. The differential of claim 11 , wherein the braking device comprises a resilient element and acts in a resiliently loaded manner on the input member or on a secondary drive train component which is connected to the input member in a rotationally secure manner.
13. The differential of claim 9 , wherein a resilient element which provides resilient force for braking operation is integrated in the differential such that a rest state of the resilient element is taken up during a Disconnect operation in which the output members are decoupled from the input member and in which the resilient element provides braking force.
14. The differential of claim 9 , wherein a resilient characteristic of a resilient element which provides braking force is negative or degressive.
15. The differential of claim 9 , wherein a resilient element is used as a restoring spring of the clutch device.
16. The differential of claim 12 , wherein the resilient element is formed by a disk spring assembly or an individual disk spring, and is arranged such that the resilient element can be deformed as far as a zero position thereof or beyond a zero position thereof.
17. The differential of claim 12 , wherein the differential has a pressure piston which is located radially externally in relation to the resilient element and coupling members of the clutch device.
18. The differential of claim 12 , wherein the differential for actuating the clutch device has a pressure piston and in that lubrication oil is supplied by at least one of the pressure piston for the differential and a bearing thereof.