Clutch Assembly for a Motor Vehicle Drivetrain, and Motor Vehicle Drivetrain

Patent metadata

Field	Value
Publication number	US-2022010855-A1
Application number	US-201917282166-A
Country	US
Kind code	A1
Filing date	Oct 2, 2019
Priority date	Oct 31, 2018
Publication date	Jan 13, 2022
Grant date	—

Abstract

A clutch assembly for a motor vehicle drivetrain for coupling coupling elements for conjoint rotation includes a clutch unit, a brake unit and at least one permanent magnet between the clutch unit and the brake unit. The clutch unit is shiftable into a coupling state in which the coupling elements are coupled to one another by shifting the clutch unit from a first position in which the coupling elements are decoupled into a second position in which the coupling elements are coupled. First and second electrically energizable coils are electrically energizable to move the permanent magnet from the first position into the second position or vice versa. A holding plate is located adjacent to the at least one permanent magnet to suppress magnetic flux from the at least one permanent magnet to the brake unit. A motor vehicle drivetrain containing at least one clutch assembly is also provided.

First claim

1 .- 13 . (canceled)

14 . A clutch assembly for a motor vehicle drivetrain for rotationally conjointly coupling coupling elements, comprising:
a clutch unit; a brake unit; at least one permanent magnet arranged between the clutch unit and the brake unit; a holding plate assigned to the brake unit; and first and second electrically energizable coils, wherein the at least one permanent magnet is configured to shift the clutch unit into a coupling state in which the coupling elements are rotationally conjointly coupled to one another, the at least one permanent magnet being movable from a first position in which the coupling elements are decoupled into a second position in which the coupling elements are coupled by the clutch unit, the first and second electrically energizable coils are configured to move the permanent magnet from the first position into the second position or from the second position into the first position, and the holding plate is composed at least partially of a ferromagnetic material and at least partially of a non-ferromagnetic material, such that a magnetic flux generated by the permanent magnet in the brake unit is interrupted.

15 . A clutch assembly for a motor vehicle drivetrain for rotationally conjointly coupling coupling elements along a rotation axis, comprising:
a clutch unit; a brake unit; at least one permanent magnet arranged between the clutch unit and the brake unit; a holding plate assigned to the brake unit; and first and second electrically energizable coils, wherein at least one permanent magnet is configured to shift the clutch unit into a coupling state in which the coupling elements are rotationally conjointly coupled to one another, the at least one permanent magnet being movable from a first position in which the coupling elements are decoupled into a second position in which the coupling elements are coupled by the clutch unit, the first and second electrically energizable coils are configured to move the permanent magnet from the first position into the second position or from the second position into the first position, and the holding plate has a step-free form at an inner radius of the holding plate.

16 . The clutch assembly according to claim 14 , wherein
the holding plate is rotationally fixed, and the brake unit includes a brake disk rotatable relative to the holding plate, and at least one pawl configured to be brought into engagement with corresponding detent geometries of the holding plate and of the brake disk such that at least one of the coupling elements is braked.

17 . The clutch assembly according to claim 15 , wherein
the holding plate is rotationally fixed, and the brake unit includes a brake disk rotatable relative to the holding plate, and at least one pawl configured to be brought into engagement with corresponding detent geometries of the holding plate and of the brake disk such that at least one of the coupling elements is braked.

18 . The clutch assembly according to claim 16 , wherein
the holding plate includes at least two shield plates arranged in each case laterally on the holding plate.

19 . The clutch assembly according to claim 18 , wherein
at least one shield plate of the at least two shield plates is configured to provide an axial stop for the brake disk.

20 . The clutch assembly according to claim 17 , wherein
the holding plate at least partially overlaps the brake disk in a radial direction.

21 . The clutch assembly according to claim 19 , wherein
the holding plate at least partially overlaps the brake disk in a radial direction.

22 . The clutch assembly according to claim 16 , further comprising:
a solenoid configured to move the pawl into detent engagement with the holding plate and the brake disk.

23 . The clutch assembly according to claim 17 , further comprising:
a solenoid configured to move the pawl into detent engagement with the holding plate and the brake disk.

24 . The clutch assembly according to claim 22 , wherein
the clutch unit includes a clutch disk is composed at least partially of a ferromagnetic material and at least partially of a non-ferromagnetic material, such that a magnetic flux generated by the permanent magnet in the brake unit is interrupted.

25 . The clutch assembly according to claim 23 , wherein
the clutch unit includes a clutch disk is composed at least partially of a ferromagnetic material and at least partially of a non-ferromagnetic material, such that a magnetic flux generated by the permanent magnet in the brake unit is interrupted.

26 . The clutch assembly according to claim 24 , wherein
the clutch disk is composed entirely of non-ferromagnetic material.

27 . The clutch assembly according to claim 25 , wherein
the clutch disk is composed entirely of non-ferromagnetic material.

28 . The clutch assembly according to claim 24 , wherein
the clutch unit includes a carrier element, and the clutch disk is arranged axially adjacent to the carrier element and at least partially overlaps the carrier element.

29 . The clutch assembly according to claim 25 , wherein
the clutch unit includes a carrier element, and the clutch disk is arranged axially adjacent to the carrier element and at least partially overlaps the carrier element.

30 . The clutch assembly according to claim 28 , wherein
the clutch unit includes at least one further pawl configured to be brought into engagement with corresponding detent geometries of the clutch disk and the carrier element such that at least two of the coupling elements are rotationally coupled.

31 . The clutch assembly according to claim 29 , wherein
the clutch unit includes at least one further pawl configured to be brought into engagement with corresponding detent geometries of the clutch disk and the carrier element such that at least two of the coupling elements are rotationally coupled.

32 . The clutch assembly according to claim 30 , wherein
the carrier element is composed at least partially of a ferromagnetic material and at least partially of a non-ferromagnetic material.

33 . The clutch assembly according to claim 31 , wherein
the carrier element is composed at least partially of a ferromagnetic material and at least partially of a non-ferromagnetic material.

34 . A motor vehicle drivetrain, comprising:
at least one clutch assembly; torque output; and a plurality of wheels, wherein the at least one clutch assembly is arranged to couple together coupling elements between at least one torque source and the torque output such that torque is transferable from the at least one torque source via the torque output to at least one of the plurality of wheels, the at least one clutch assembly includes a clutch unit; a brake unit; at least one permanent magnet arranged between the clutch unit and the brake unit; a holding plate assigned to the brake unit; and first and second electrically energizable coils, the at least one permanent magnet is configured to shift the clutch unit into a coupling state in which the coupling elements are rotationally conjointly coupled to one another, the at least one permanent magnet being movable from a first position in which the coupling elements are decoupled into a second position in which the coupling elements are coupled by the clutch unit, the first and second electrically energizable coils are configured to move the permanent magnet from the first position into the second position

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Liebert Sebastian
• Ohnemus Ulrich

Classifications

• F16D2500/1107

  Vehicles · CPC title

• F16D2500/10412

  Transmission line of a vehicle · CPC title

• F16D2500/1022

  Electromagnet · CPC title

• F16D2121/20

  using electromagnets · CPC title

• F16D67/06 Primary

  electromagnetically actuated · CPC title