Transmission assembly with more than one reduction ratio and method for operating a transmission assembly

Patent metadata

Field	Value
Publication number	US-12196308-B2
Application number	US-202418422261-A
Country	US
Kind code	B2
Filing date	Jan 25, 2024
Priority date	Jan 25, 2023
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

A transmission assembly has more than one reduction ratio. For this purpose, the transmission assembly can comprise a planetary transmission in which the annulus can rotate freely in a first position and in which the annulus is held fixed against rotation in a second position. A method of operating a transmission assembly is also disclosed.

First claim

The invention claimed is:

1. A transmission assembly for an electromechanical wheel brake for a motor vehicle comprising:
a planetary transmission having a sun wheel, which is connected for conjoint rotation to a drive shaft, a number of planet wheels, which are rotatably mounted on a planet carrier, and an annulus surrounding the planet wheels;
wherein the planet carrier is connected for conjoint rotation to an output shaft;
wherein the planet wheels are supported by the planet carrier in such a way that they can roll both on the sun wheel and on the annulus;
wherein the annulus can rotate freely in a first position and is held fixed against rotation in a second position during operation of the transmission assembly such that the transmission assembly has at least a first and a second reduction ratio;
a clutch is provided between the drive shaft and the planet carrier; and
an axial bearing via which an axial force acting on the output shaft can be applied to the annulus.

2. The transmission assembly as claimed in claim 1 , wherein, in the first position, the torque can be transmitted from the drive shaft to the output shaft via the clutch, wherein the clutch is designed as a physically solid element.

3. The transmission assembly as claimed in claim 1 wherein, in the second position, the torque can be transmitted from the drive shaft to the planet wheels via the sun wheel.

4. The transmission assembly as claimed in claim 1 , wherein the clutch is designed as an overload clutch or as a friction clutch.

5. The transmission assembly as claimed in claim 1 , wherein the annulus is supported in such a way as to be movable in an axial direction relative to a surrounding housing.

6. The transmission assembly as claimed in claim 1 , wherein toothing is provided between the sun wheel, the planet wheels and/or the annulus, wherein the teeth are arranged parallel to the rotational axis.

7. The transmission assembly as claimed in claim 1 , wherein, in the second position, the annulus is connected frictionally and/or positively to a housing or a stop.

8. An electromechanical wheel brake for a motor vehicle transmission assembly comprising:
a planetary transmission having a sun wheel, which is connected for conjoint rotation to a drive shaft, a number of planet wheels, which are rotatably mounted on a planet carrier, and an annulus surrounding the planet wheels;
wherein the planet carrier is connected for conjoint rotation to an output shaft;
wherein the planet wheels are supported by the planet carrier in such a way that they can roll both on the sun wheel and on the annulus;
wherein the annulus can rotate freely in a first position and is held fixed against rotation in a second position during operation of the transmission assembly such that the transmission assembly has at least a first and a second reduction ratio;
a clutch is provided between the drive shaft and the planet carrier; and
an axial bearing via which an axial force acting on the output shaft can be applied to the annulus.

9. The electromechanical wheel brake as claimed in claim 8 , designed as a service brake and/or as a parking brake.

10. A method for operating an electromechanical wheel brake of a motor vehicle comprising:
a rotatably mounting planet wheels on a planet carrier in such a way that they can roll both on a sun wheel and on a annulus;
connecting the planet carrier for conjoint rotation to an output shaft;
rotating the annulus can rotate freely in a first position; and
holding the annulus fixed against rotation in a second position during operation of the transmission assembly such that the transmission assembly has at least a first and a second reduction ratio; and
applying an axial force to the output shaft via an axial bearing wherein the axial force can be applied to the annulus.

Assignees

• Continental Automotive Tech Gmbh

Inventors

• Stauder Peter
• Kajic Miroslav
• Haag Mathias
• Balz Jürgen

Classifications

• F16H3/663 Primary

  with conveying rotary motion between axially spaced orbital gears, e.g. a stepped orbital gear or Ravigneaux · 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

• F16H57/082 Primary

  Planet carriers · CPC title

• F16H57/10

  Braking arrangements · CPC title