Transmission and differential gearing and engine and gearing unit

Patent metadata

Field	Value
Publication number	US-9777816-B2
Application number	US-201314652991-A
Country	US
Kind code	B2
Filing date	Dec 3, 2013
Priority date	Dec 17, 2012
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

A transmission and differential gearing with a housing, with an input shaft and two output shafts arranged coaxially with respect to the input shaft, wherein a transmission section and a differential section are provided, wherein the transmission section has two planet stages, namely an input stage and a load stage, wherein the sun wheel of the input stage is actively connected to the input shaft, wherein the load stage has a ring gear fixed to the housing, and the sun wheel of the load stage can be or is actively connected via a web to at least one planet wheel of the input stage, and wherein at least one planet wheel of the load stage is actively connected via a web to an input shaft of the differential section. The requirement for construction space is reduced and the use flexibility increased by the fact that the ring gear of the input stage can be coupled actively and for conjoint rotation to, or can be decoupled from, a planet carrier of the planet wheel of the input stage or to, or from, a planet carrier of the planet wheel of the load stage via a correspondingly provided and/or arranged coupling device.

First claim

The invention claimed is:

1. A transmission and differential gear train comprising:
a housing,
an input shaft,
two output shafts arranged coaxially to the input shaft, and
a transmission section and a differential section configured as a spur gear differential,
wherein the transmission section has two planet stages, namely an input stage and a load stage,
wherein a first sun wheel of the input stage is operatively connected to the input shaft,
wherein the load stage comprises a first internal ring gear affixed in the housing, and a second sun wheel of the load stage is configured to be operatively connected to at least one first planet wheel of the input stage via a first planet arm,
wherein at least one second planet wheel of the load stage is operatively connected to an input shaft of the spur gear differential via a second planet arm, and
wherein, via a coupling mechanism, a second internal ring gear of the input stage is configured to be operatively and non-rotatably coupled to, or uncoupled from, a first planet carrier of the at least one first planet wheel of the input stage, or coupled to or uncoupled from a second planet carrier of the at least one second planet wheel of the load stage.

2. The transmission and differential gear train according to claim 1 , wherein the coupling mechanism is configured such that the coupling or uncoupling of the appertaining elements is implemented by positive-fit elements configured to achieve a positive-fit coupling.

3. The transmission and differential gear train according to claim 1 , wherein a third planet arm or a parking lock shaft of the at least one first planet wheel of the input stage is connected to a parking lock spur wheel that engages with a parking lock mechanism provided in the housing.

4. The transmission and differential gear train according to claim 1 , wherein the coupling mechanism comprises a coupling ring, a coupling wheel and a clutch drive ring.

5. The transmission and differential gear train according to claim 4 , wherein the coupling ring is configured to move axially on the second internal ring gear, and the coupling ring, as well as the second internal ring gear, comprise splines configured to engage with each other.

6. The transmission and differential gear train according to claim 5 , wherein the coupling wheel is operatively connected to the first planet carrier of the at least one first planet wheels of the input stage, and wherein the coupling wheel comprises teeth on an outer circumference thereof that match the spline of the coupling ring.

7. The transmission and differential gear train according to claim 6 , wherein the coupling wheel is configured to move the coupling ring in order to achieve an operative coupling.

8. The transmission and differential gear train according to claim 4 , wherein the clutch drive ring is operatively and non-rotatably connected to the second planet carrier of the at least one second planet wheel of the load stage, or is connected to the second planet arm of the load stage, and/or
the clutch drive ring is arranged on and/or attached to the second planet carrier, and wherein the clutch drive ring has external teeth on a projection area.

9. The transmission and differential gear train according to claim 4 , wherein the coupling ring is configured to be moved, at least partially, onto the clutch drive ring in order to achieve an operative coupling.

10. A motor and gear unit comprising:
an electric motor; and
the transmission and differential gear train according to claim 1
wherein the transmission and differential gear train is coaxially flanged onto the electric motor,
wherein a motor output shaft of the electric motor is connected to the input shaft of the gear train; and
wherein the motor output shaft is configured as a hollow shaft, whereby one of the output shafts of the gear train passes coaxially through the hollow shaft.

Assignees

• Volkswagen Ag

Inventors

• Petersen Rainer
• Möckel Jörg
• Lutz Andreas
• Hanke Stefan

Classifications

• B60L15/2054

  by controlling transmissions or clutches · CPC title

• B60K1/00 Primary

  Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00) · CPC title

• B60L2240/423

  Torque · CPC title

• Y02T10/72

  Electric energy management in electromobility · CPC title

• B60K2001/001

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