Electric vehicle transmission

Patent metadata

Field	Value
Publication number	US-11719317-B2
Application number	US-202218047103-A
Country	US
Kind code	B2
Filing date	Oct 17, 2022
Priority date	Oct 28, 2021
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

An electric vehicle transmission ( 7 ) has a drive input shaft ( 10 ), a drive output shaft ( 11 ), a first planetary gearset (P 1 ), a second planetary gearset (P 2 ), and a third planetary gearset (P 3 ). The drive input shaft ( 10 ) is designed to be coupled to an electric machine ( 6 ). In addition, at least functionally a first shifting element (A), a second shifting element (B), a third shifting element (C), and a fourth shifting element (D) are provided. Also disclosed is a drive system ( 4 ), a vehicle drive-train ( 5 ), and an electric vehicle incorporating an electric vehicle transmission of this type.

First claim

The invention claimed is:

1. An electric vehicle transmission comprising:
a drive input shaft configured to be coupled to an electric machine;
a drive output shaft;
a first planetary gearset
a second planetary gearset; and
a third planetary gearset;
wherein:
the first planetary gearset, the second planetary gearset and the third planetary gearset each comprise a first element, a second element and a third element, in the form of a sun gear, a planetary web, and a ring gear respectively, wherein at least in functional terms a first shifting element, a second shifting element and a third shifting element are provided;
the first element of the first planetary gearset is connected rotationally fixed to the drive input shaft;
the second element of the first planetary gearset and the first element of the third planetary gearset are connected rotationally fixed to one another
the third element of the first planetary gearset and the first element of the second planetary gearset are connected rotationally fixed to one another;
the third element of the third planetary gearset is immobilized;
the second element of the third planetary gearset is connected rotationally fixed to the drive output shaft;
the second element of the third planetary gearset is connected rotationally fixed to the drive output shaft;
the second element of the second planetary gearset can be immobilized by the first shifting element;
two of the elements of the second planetary gearset can be brought into rotationally fixed connection with one another by means of the second shifting element;
the third element of the second planetary gearset can be connected rotationally fixed by the third shifting element to the first element of the third planetary gearset and to the second element of the first planetary gearset; and
by means of an at least functionally effective fourth shifting element the said third element of the second planetary gearset can be brought into rotationally fixed connection with the drive output shaft.

2. The electric vehicle transmission according to claim 1 , comprising:
a first gear between the drive input shaft and the drive output shaft, the first gear obtained by closing the first shifting element and the third shifting element;
a second gear between the drive input shaft and the drive output shaft, the second gear obtained by actuating the first shifting element and the fourth shifting element; and
a third gear between the drive input shaft and the drive output shaft, the third gear obtained by closing the second shifting element and the fourth shifting element.

3. The electric vehicle transmission according to claim 1 , wherein a function of a parking lock is obtained by the simultaneous actuation of the first shifting element and the second shifting element.

4. The electric vehicle transmission according to claim 3 wherein the coupling element of the shifting device is further configured to be moved to a third position in which the coupling element functionally brings about a simultaneous actuation of the first shifting element and the second shifting element, in that the second element of the second planetary gearset is fixed by the coupling element and is at the same time connected rotationally fixed to the first element or to the third element of the second planetary gearset.

5. The electric vehicle transmission according to claim 1 , wherein a function of a parking lock is obtained by the simultaneous actuation of the third shifting element and the fourth shifting element.

6. The electric vehicle transmission according to claim 1 , wherein the shifting elements are in the form of interlocking shifting elements.

7. The electric vehicle transmission according to claim 6 , wherein the first shifting element and the second shifting element are formed by a shifting device having a coupling element configured to be positioned in a first shift position and in a second shift position, wherein in the first shift position the coupling element functionally brings about an actuated condition of the first shifting element and fixes the second element of the second planetary gearset, and wherein in the second shift position the coupling element functionally brings about an actuated condition of the second shifting element and connects the second element of the second planetary gearset rotationally fixed to the first element or to the third element of the second planetary gearset.

8. The electric vehicle transmission according to claim 6 , wherein the third shifting element and the fourth shifting element are formed by a shifting device having a coupling element configured to be positioned in a first shift position and in a second shift position, wherein, in its first shift position the coupling element functionally brings about an actuated condition of the third shifting element and connects the third element of the second planetary gearset rotationally fixed to the first element of the third planetary gearset and the second element of the first planetary gearset, and wherein in its second shift position the coupling element functionally brings about an actuated condition of the fourth shifting element and connects the third element of the second planetary gearset rotationally fixed to the drive output shaft.

9. The electric vehicle transmission according to claim 8 , wherein the coupling element of the shifting device is further configured to be moved to a third shift position in which the coupling element functionally beings about a simultaneous actuated condition of the third shifting element and of the fourth shifting element, in that the third element of the second planetary gearset is at the same time connected to the first element of the third planetary gearset and the second element of the first planetary gearset and is connected rotationally fixed to the drive output shaft.

10. The electric vehicle transmission according to claim 6 , wherein the shifting elements are in the form of unsynchronized claw-type shifting elements.

11. The electric vehicle transmission according to claim 1 , wherein the drive output shaft is coupled to a differential gear system.

12. The electric vehicle transmission according to claim 1 , wherein the planetary gearsets are arranged at a connection point of the drive input shaft that serves for the coupling of the drive input shaft to the electric machine, in a sequence of the first planetary gearset, the second planetary gearset, and the third planetary gearset.

13. The electric vehicle transmission according to claim 12 , wherein the first shifting element and the second shifting element are positioned axially between the first planetary gearset and the second planetary gearset, and the third shifting element and the fourth shifting element are positioned axially between the second planetary gearset and the third planetary gearset.

14. A drive system for an electric vehicle, comprising:
an electric machine and an electric vehicle transmission according to claim 1 , wherein the electric machine includes a rotor, the rotor of the electric machine coupled to the drive input shaft of the electric vehicle transmission.

15. The drive system according to claim 14 , wherein the first planetary gearset of the electric vehicle transmission is arranged axially overlapping and radially inside the electric machine.

16. A vehicle drive-train comprising a drive system according to claim 14 .

17. The vehicle drive-train according to claim 16 , wherein the drive system is arranged parallel to a drive axle, and the drive output shaft of the electric vehicle transmi

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Rittler David
• Renner Stefan
• Spühler Stefan
• Glückler Johannes
• Trübenbach Michael
• Lenz Paul

Classifications

• F16H3/66 Primary

  composed of a number of gear trains without drive passing from one train to another · CPC title

• F16H61/22

  Locking {of the control input devices} (constructional features of locking or disabling mechanisms F16H63/34) · CPC title

• B60K17/08 Primary

  of mechanical type · CPC title

• F16H37/082 Primary

  and additional planetary reduction gears · CPC title

• B60K1/00

  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