Roller device for a traction mechanism drive of a motor vehicle

Patent metadata

Field	Value
Publication number	US-10125850-B2
Application number	US-201414276221-A
Country	US
Kind code	B2
Filing date	May 13, 2014
Priority date	May 21, 2013
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A roller device for a traction mechanism drive of a motor vehicle, with a roller element for introducing a torque provided via the traction mechanism and a driven shaft for driving an auxiliary unit. The roller device has a magnetic coupling for non-positive torque transfer between the roller element and the driven shaft. The magnetic coupling has a primary-side unit connected to the roller element with a primary magnetic element and a secondary-side unit connected to the driven shaft with a secondary-side magnetic element. The magnetic elements are permanent and/or electromagnetic elements. The non-positive torque transfer is realized by magnetic fields of the primary-side and secondary-side magnetic elements. At least one magnetic element of the two units for changing the magnetic field overlap of the magnetic fields of the primary-side and secondary-side magnetic elements is movably arranged within its unit. A corresponding traction mechanism drive and method are provided.

First claim

The invention claimed is:

1. A roller device for a traction mechanism drive of a motor vehicle, comprising:
a roller element for introducing a torque provided by the traction mechanism of the traction mechanism drive,
a driven shaft for driving an auxiliary unit of the motor vehicle, and
a magnetic coupling for non-positive torque transfer between the roller element and the driven shaft,
the magnetic coupling includes a primary-side unit connected to the roller element with at least one primary magnetic element and a secondary-side unit connected to the driven shaft with at least one secondary-side magnetic element,
the magnetic elements are at least one of permanent magnetic or electromagnetic elements and the non-positive torque transfer is realized by the magnetic fields of the primary-side and the secondary-side magnetic elements,
at least one of the magnetic elements of the two units is arranged to be movable within the respective primary-side or secondary-side unit for changing a magnetic field overlap of magnetic fields of the primary-side and secondary-side magnetic elements,
wherein the at least one of the magnetic elements is movable in a first direction via an adjustment force applied by an actuator device and in an opposite direction via a restoring force applied by a restoring element, the restoring force increasing an amount of overlap of the magnetic fields of the primary-side and secondary-side magnetic elements,
wherein a rest position of the magnetic elements is set by an equilibrium between the adjustment force and the restoring force, and
wherein the at least one of the magnetic elements that is movable has a radial displaceability or has a displaceability with at least a radial component, the respective primary-side or secondary-side unit having a guide rail for the at least one of the magnetic elements that is movable, and at least a second one of the magnetic elements is a conductor loop.

2. The roller device according to claim 1 , wherein the at least one magnetic element that is movable has a displaceability with at least an axial component.

3. The roller device according to claim 1 , wherein the at least one displaceable magnetic element is a permanent magnetic element.

4. The roller device according to claim 1 , wherein the at least one displaceable magnetic element is an electromagnetic element.

5. The roller device according to claim 1 , wherein the magnetic coupling is formed as an eddy current coupling.

6. A traction mechanism drive for driving auxiliary units of a motor vehicle with an input roller element that is connectable to an engine shaft of a motor vehicle engine, at least one output roller device coupled via a common traction mechanism to the input roller element for driving an associated auxiliary unit, and the at least one output roller device is constructed as a roller device according to claim 1 .

7. A method for driving an auxiliary unit of a motor vehicle connected via a roller device according to claim 1 , comprising at least one of controlling or regulating a rotational speed of the driven shaft of the roller device by displacing of the at least one displaceable magnetic element of the magnetic coupling of the roller device.

8. The roller device according to claim 1 , wherein the rest position is an intermediate position between extreme positions at which one of the restoring element and the actuator have a respective maximum effect.

9. The roller device according to claim 1 , wherein the restoring element is located opposite the actuator relative to the magnetic element.

10. The roller device according to claim 1 , wherein the actuator applies the adjustment force in a directly radial direction.

Assignees

• Schaeffler Technologies Gmbh & Co Kg
• Schaeffler Technologies Ag

Inventors

• Dippold Oliver
• Wagner Ralf
• Gerner Armin

Classifications

• H02K49/106

  with a radial air gap · CPC title

• F16H55/36

  Pulleys (with features essential for adjustment F16H55/52) · CPC title

• H02K49/046

  with an axial airgap · CPC title

• H02K49/043 Primary

  with a radial airgap · CPC title

• H02K21/024

  Radial air gap machines · CPC title