Drive arrangement for a vehicle and method to perform gear changes

Patent metadata

Field	Value
Publication number	US-11353091-B2
Application number	US-202016953617-A
Country	US
Kind code	B2
Filing date	Nov 20, 2020
Priority date	Nov 28, 2019
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

Electric vehicle drive arrangement having input and output shafts (EW, AW) and a change-speed transmission (G). The transmission (G) has two planetary gearsets (PS1, PS2) and first, second and third shifting elements (SE1, SE2, SE3) for engaging first, second and third gears (G1, G2, G3). The first planetary gearset (PS1) comprises a first sun shaft (SO1), a first ring gear shaft (HR1) and a first carrier shaft (ST1). The second planetary gearset (PS2) comprises a second sun shaft (SO2), a second ring gear shaft (HR2) and a second carrier shaft (ST2). The first carrier shaft (ST1) is connected to the second ring gear shaft (HR2), and the first sun shaft (SO1) forms the transmission input shaft (EW). The second carrier shaft (ST2) forms the transmission output shaft (AW). The first shifting element engages first gear, the second shifting element engages second gear and the third shifting element engages third gear.

First claim

The invention claimed is:

1. A drive arrangement of a vehicle comprising:
a change-speed transmission with a transmission input shaft and a transmission output shaft,
the transmission being in a form of a three-gear transmission for engaging a first gear, a second gear and a third gear by a first shifting element, a second shifting element and a third shifting element,
first and second mutually coupled planetary gearsets,
the first planetary gearset comprising a first sun shaft, a first ring gear shaft and a first carrier shaft and the second planetary gearset comprising a second sun shaft, a second ring gear shaft and a second carrier shaft,
the first carrier shaft being permanently connected to the second ring gear shaft,
the first sun shaft being permanently connected to and forming the transmission input shaft,
the second sun shaft being permanently secured to a housing,
the second carrier shaft being permanently connected to and forming the transmission output shaft such that rotation of the second sun shaft relative to the transmission output shaft is prevented, and
the first shifting element being actuatable to engage the first gear,
the second shifting element being actuatable to engage the second gear and the third shifting element being actuatable to engage the third gear.

2. The drive arrangement according to claim 1 , wherein the first ring gear shaft is couplable to the housing by actuating only the first shifting element.

3. The drive arrangement according to claim 1 , wherein the first ring gear shaft is couplable to the second carrier shaft by the second shifting element.

4. The drive arrangement according to claim 1 , wherein the first planetary gearset is blocked by engagement of only the third shifting element, whereby either
the first ring gear shaft is couplable to the first sun shaft and the transmission input shaft such that relative rotation between the first ring gear shaft, the first sun shaft and the transmission input shaft is prevented, or
the first ring gear shaft is couplable to the first carrier shaft such that relative rotation between the first ring gear shaft and the first carrier shaft is prevented.

5. The drive arrangement according to claim 1 , wherein the first, the second and the third shifting elements are in a form of disk clutches.

6. The drive arrangement according to claim 1 , wherein the first, the second and the third shifting elements are in a form of unsynchronized claw clutches.

7. The drive arrangement according to claim 6 , wherein at least one of the first, the second and the third shifting elements is in the form of a triple shifting element, such that the first, the second and the third shifting elements are actuatable by a sliding sleeve and the sliding sleeve is arranged and movable on the first ring gear shaft.

8. The drive arrangement according to claim 1 , wherein the first and the second shifting elements are in a form of claw clutches and the third shifting element is in a form of a disk clutch.

9. The drive arrangement according to claim 8 , wherein the first and the second shifting elements are combined as a double shifting element.

10. The drive arrangement according to claim 1 , wherein the first, the second and the third shifting elements are individual shifting elements.

11. A method of carrying out shifts under load by first, second and third shifting elements of a change-speed transmission having a transmission input shaft and a transmission output shaft, the change-speed transmission being a three-gear transmission for engaging a first gear, a second gear and a third gear by the first shifting element, the second shifting element and the third shifting element, and the change-speed transmission further having first and second mutually coupled planetary gearsets, the first planetary gearset having a first sun shaft, a first ring gear shaft and a first carrier shaft, and the second planetary gearset having a second sun shaft, a second ring gear shaft and a second carrier shaft, the first carrier shaft being permanently connected to the second ring gear shaft, the first sun shaft being permanently connected to and forming the transmission input shaft, the second sun shaft being permanently secured to a housing, the second carrier shaft being permanently connected to and forming the transmission output shaft, the first shifting element being actuatable to engage the first gear, the second shifting element being actuatable to engage the second gear and the third shifting element being actuatable to engage the third gear, the method facilitating an upshift, under traction, from the first gear to the second gear, the method comprising:
initiating the upshift from the first gear in which the first shifting element is engaged and the second and the third shifting elements are disengaged,
engaging the third shifting element with slip until the first shifting element becomes free from load and is disengaged,
subsequently further engaging the third shifting element until the second shifting element is synchronized and is engagable, and
disengaging the third shifting element again.

12. The method of carrying out shifts according to claim 11 , further comprising:
initiating an upshift, under traction, from the second gear, in which the second shifting element is engaged and the first and the third shifting elements are disengaged, to the third gear,
engaging the third shifting element with slip until the second shifting element becomes free from load and is disengaged, and
subsequently completely engaging the third shifting element.

13. The method of carrying out shifts according to claim 11 , wherein if a double shifting element is used, a disengaged position of the first shifting element and a disengaged position of the second shifting element is a neutral position of the double shifting element.

14. The method of carrying out shifts according to claim 11 , further comprising carrying out actuation by electric motor-actuated ball ramps.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Renner Stefan

Classifications

• F16H3/66 Primary

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

• F16H2200/2007

  with two sets of orbital gears · CPC title

• F16H2003/442

  comprising two or more sets of orbital gears arranged in a single plane · CPC title

• F16H2200/2097

  comprising an orbital gear set member permanently connected to the housing, e.g. a sun wheel permanently connected to the housing · CPC title

• F16H2200/2064

  using at least one positive clutch, e.g. dog clutch · CPC title