Shiftable two-speed transmission suitable for edrive

Patent metadata

Field	Value
Publication number	US-10920858-B2
Application number	US-201616462429-A
Country	US
Kind code	B2
Filing date	Nov 29, 2016
Priority date	Nov 29, 2016
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

In a power-shift two-speed transmission for transmitting propulsion power, in particular propulsion power from an electric motor, within a motor vehicle drivetrain, possibly driven by electric motor, of a passenger car, by means of which a direct drive and a transmission stage with a transmission ratio that differs from the direct drive can be implemented and which has the three assembly units comprising an outer gear unit, a planet gear unit and a sun unit, it is provided for the propulsion power to be introduced into the transmission via the outer gear unit when propulsion power is being transmitted.

First claim

The invention claimed is:

1. A final drive unit for a drivetrain of a motor vehicle comprising a two-speed transmission for transmitting propulsion power within the motor vehicle drivetrain, wherein the two-speed transmission comprises:
a rotationally driven input member, via which, when propulsion power is being transmitted, the propulsion power is introduced into the transmission; and
an output member, via which the propulsion power can be transmitted out of the transmission;
wherein, subject to the shift position of a shiftable clutch, a direct drive or a transmission stage having a transmission ratio which differs from the direct drive can be implemented between the input member and the output member,
wherein three assembly units comprising an outer gear unit, a planet gear unit and a sun unit, are provided, wherein, when propulsion power is being transmitted, the propulsion power is introduced into the transmission via the outer gear unit;
wherein the planet gear unit has at least one planet gear pair having at least one first planet gear having a first effective planet gear diameter and at least one second planet gear connected for conjoint rotation to the first planet gear and having a second effective planet gear diameter, wherein, in addition to a supporting sun unit having a supporting sun gear having an effective supporting sun gear diameter, an output sun unit having an output sun gear having an output sun gear diameter is provided, and wherein the first planet gear meshes with the supporting sun gear, and the second planet gear meshes with the output sun gear; and
wherein the supporting sun gear is blocked in at least one direction of rotation by a blocking device, and the propulsion power is transmitted out of the transmission via the output sun gear.

2. The final drive unit of claim 1 , wherein the outer gear unit has an outer gear, into which planet gears of the planet gear unit are at least partially integrated and are situated radially on the inside.

3. The final drive unit of claim 1 , wherein the outer gear unit has an outer gear having outer teeth, via which the propulsion power is introduced into the outer gear unit.

4. The final drive unit of claim 1 , wherein the blocking device is a passive blocking device.

5. The final drive unit of claim 1 , wherein the blocking device is a freewheel, which, in one direction of rotation, blocks the assembly unit with which the freewheel interacts and allows it to rotate in the other direction of rotation.

6. The final drive unit of claim 1 , wherein the blocking device is an active blocking device to block the assembly unit with which it interacts in at least one direction of rotation.

7. The final drive unit of claim 1 , wherein the transmission stage has a transmission ratio greater than 1.

8. The final drive unit of claim 1 , wherein the shiftable clutch acts between the outer gear unit and the sun unit.

9. The final drive unit of claim 1 , wherein the outer gear unit is not in engagement with planet gears of the planet gear unit.

10. The final drive unit of claim 1 , wherein the clutch is arranged to lock the supporting sun unit or the output sun unit to the outer gear unit, and the outer gear unit and the planet gear unit are connected permanently to one another for conjoint rotation to form a functional unit in order to jointly form the input member.

11. The final drive unit of claim 1 , wherein the final drive unit has a differential unit for driving wheel shafts, and the two-speed transmission and the differential unit are arranged in a common final drive housing.

12. The final drive unit of claim 1 , wherein a motor-driven transmission drive shaft is in direct power-transmitting engagement with the outer gear unit in order to introduce the driving power of the motor into the two-speed transmission.

13. The final drive unit of claim 12 , wherein the motor-driven transmission drive shaft is arranged coaxially with a wheel shaft.

14. The final drive unit of claim 1 , wherein the output member of the transmission is in direct power-transmitting engagement with a differential housing of a differential unit.

15. The final drive unit of claim 1 , wherein the final drive unit has a differential unit, which is clutch-controlled by means of at least one differential clutch, the differential unit has a differential housing, and the differential housing is a clutch plate carrier of the at least one differential clutch.

Assignees

• Gkn Automotive Ltd

Inventors

• Haupt Jan
• Abbenhaus Moritz
• Werkhausen Maximilian

Classifications

• F16H3/54

  one of the central gears being internally toothed and the other externally toothed · CPC title

• B60K17/02 Primary

  characterised by arrangement, location, or kind of clutch · CPC title

• B60K2001/001

  one motor mounted on a propulsion axle for rotating right and left wheels of this axle · CPC title

• B60K17/08

  of mechanical type · CPC title

• F16H2200/2066

  using one freewheel mechanism · CPC title