Drive unit for a vehicle

Patent metadata

Field	Value
Publication number	US-2023268794-A1
Application number	US-202118020397-A
Country	US
Kind code	A1
Filing date	Jul 26, 2021
Priority date	Aug 10, 2020
Publication date	Aug 24, 2023
Grant date	—

Abstract

The invention relates to a drive unit (10) for a vehicle comprising an electric machine (12) having a rotor shaft (14) and a transmission (16) with a transmission shaft (18), wherein the transmission shaft (18) is rotatably mounted in a first housing section (22) by means of a first rolling bearing (20) and the rotor shaft (14) is rotatably mounted in a second housing section (26) by means of a rolling second bearing (24). According to the invention, the transmission shaft (18) and the rotor shaft (14) are coupled to another in a rotationally fixed manner, wherein a third rolling bearing (28) which has an inner bearing ring (30) is arranged at the transition between the transmission shaft (18) and the rotor shaft (14), wherein the inner bearing ring (30) is in contact with the rotor shaft (14) and the transmission shaft (18) with its inner surface (32).

First claim

1 . A drive unit ( 10 ) for a vehicle comprising: an electric machine ( 12 ) having a rotor shaft ( 14 ) and a transmission ( 16 ) having a transmission shaft ( 18 ), wherein the transmission shaft ( 18 ) is rotatably mounted in a first housing section ( 22 ) by a first rolling bearing ( 20 ) and the rotor shaft ( 14 ) is rotatably mounted in a second housing section ( 26 ) by a second rolling bearing ( 24 ), wherein the transmission shaft ( 18 ) and the rotor shaft ( 14 ) are coupled to one another in a rotationally fixed manner, wherein a third rolling bearing ( 28 ) which comprises an inner bearing ring ( 30 ) is disposed at the transition between the transmission shaft ( 18 ) and the rotor shaft ( 14 ), wherein an inner surface ( 32 ) of the inner bearing ring ( 30 ) abuts the rotor shaft ( 14 ) and the transmission shaft ( 18 ).

2 . The drive unit ( 10 ) according to claim 1 , wherein the third rolling bearing ( 28 ) is seated on the transmission shaft ( 18 ), wherein the inner bearing ring ( 30 ) abuts a radial projection ( 38 ) on a side facing away from the rotor shaft ( 14 ).

3 . The drive unit ( 10 ) according to claim 1 , wherein the first rolling bearing ( 20 ) and the third rolling bearing ( 28 ) are disposed in the first housing section ( 22 ) in an X arrangement or an O arrangement.

4 . The drive unit ( 10 ) according to claim 1 , wherein the transmission shaft ( 18 ) and the rotor shaft ( 14 ) are fastened to one another axially, wherein one bearing of the first rolling bearing ( 20 ) and the third rolling bearing ( 28 ) is configured as a floating bearing and the respective other bearing as a fixed bearing.

5 . The drive unit ( 10 ) according to claim 1 , wherein the rotor shaft ( 18 ) abuts the inner surface ( 32 ) of the inner bearing ring ( 30 ) of the third rolling bearing ( 28 ) with an outer peripheral surface ( 41 ), wherein the rotor shaft ( 14 ) is supported axially on the inner bearing ring ( 30 ) of the third rolling bearing ( 28 ) or on the transmission shaft ( 18 ) with a radial shoulder ( 44 ).

6 . The drive unit ( 10 ) according to claim 1 , wherein the third rolling bearing ( 28 ) comprises an axially extended inner bearing ring ( 30 ) which projects axially from the third rolling bearing ( 28 ) or that the third rolling bearing ( 28 ) is implemented as a larger rolling bearing than the first rolling bearing ( 20 ) and the second rolling bearing ( 24 ).

7 . The drive unit ( 10 ) according to claim 6 , wherein the third rolling bearing ( 28 ) comprises a shoulder ( 60 ) having an enlarged inner diameter on the inner bearing ring ( 30 ), wherein the rotor shaft ( 14 ) abuts the inner bearing ring ( 30 ) with an outer peripheral surface ( 41 ) in this shoulder ( 60 ).

8 . The drive unit ( 10 ) according to claim 1 , wherein the rotor shaft ( 14 ) comprises a step ( 42 ) having a reduced outer diameter, wherein the inner surface ( 32 ) of the inner bearing ring ( 30 ) of the third rolling bearing ( 28 ) abuts the rotor shaft ( 14 ) at this step ( 42 ).

9 . The drive unit ( 10 ) according to claim 1 , wherein the transmission shaft ( 18 ) is configured axially in sections or entirely as a hollow shaft.

10 . The drive unit ( 10 ) according to claim 1 , wherein the rotor shaft ( 14 ) and the transmission shaft ( 18 ) are connected to one another in a material-locking, form-locking and/or force-locking mariner.

Assignees

• Bosch Gmbh Robert

Inventors

• Kocherscheidt Johannes Daniel
• Kiekbusch Timo
• Jung Philipp

Classifications

• H02K7/08

  Structural association with bearings · CPC title

• H02K7/003

  Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28) · CPC title

• H02K5/1732 Primary

  radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence) · CPC title

• F16H57/0018

  Shaft assemblies for gearings (camshafts with single track cams F16H53/02) · CPC title

• F16C3/02

  Shafts; Axles · CPC title