Back to results
US 9,797,498 B2Granted
Isolator with double acting spring system with reduced noise
AssigneeLitens Automotive Partnership
InventorsVladimir I. Starodoubov, John Antchak, Andrew M. Boyes, Boris Replete
Life of this patent
Estimating the term…
Abstract
An isolator is provided for use with an engine and in particular an engine that is assisted or started by MGU (Motor-Generator Unit) or a motor through an endless drive member. It comprises a double acting spring system for isolating crankshaft pulley from torsion vibration at the crankshaft, and in extreme conditions, such as during engine startup and accelerations or decelerations of the engine crankshaft relative to the pulley and when isolator operates in an “engine-driven” mode with the engine crankshaft is driven by the belt.
Claims17
An isolator, comprising:
- a spring having a first spring end and a second spring end;
- a shaft adapter that is mountable to a crankshaft for rotation about an axis, wherein the shaft adapter has a first adapter drive surface that is engageable with the first spring end and a second adapter drive surface that is angularly spaced from the first adapter drive surface by an adapter drive surface spacing and that is engageable with the second spring end;
- and
- a pulley that is engageable with an endless drive member and that is rotatable relative to the shaft adapter, wherein the pulley has a first pulley drive surface that is engageable with the first spring end and a second pulley drive surface that is angularly spaced from the first pulley drive surface by a pulley drive surface spacing and that is engageable with the second spring end,
- wherein torque is transferable from the shaft adapter to the spring through the first spring end, and from the spring to the pulley through the second spring end,
- wherein torque is transferable from the pulley to the spring through the first spring end, and from the spring to the shaft adapter through the second spring end,
- wherein one of the adapter and pulley drive surface spacings is larger than the other of the adapter and pulley drive surface spacings,
- wherein, when transitioning from torque transfer from the shaft adapter to the pulley to torque transfer from the pulley to the shaft adapter, the second adapter drive surface engages the second spring end at a different time than the first adapter drive surface disengages from the first spring end, and the second pulley drive surface disengages from the second spring end at a different time than the first pulley drive surface engages the first spring end,
- and wherein when transitioning from torque transfer from the pulley to the shaft adapter to torque transfer from the shaft adapter to the pulley the first adapter drive surface engages the first spring end at a different time than the second adapter drive surface disengages from the second spring end, and the first pulley drive surface disengages from the first spring end at a different time than the second pulley drive surface engages the second spring end.
6 more elements
An isolator, comprising:
- a spring having a first spring end and a second spring end;
- a shaft adapter that is mountable to a crankshaft for rotation about an axis, wherein the shaft adapter has a first adapter drive surface that is engageable with the first spring end and a second adapter drive surface that is angularly spaced from the first adapter drive surface and that is engageable with the second spring end;
- and
- a pulley that is engageable with an endless drive member and that is rotatable relative to the shaft adapter, wherein the pulley has a first pulley drive surface that is engageable with the first spring end and a second pulley drive surface that is angularly spaced from the first pulley drive surface and that is engageable with the second spring end, a friction member that is fixedly connected to one of the pulley and the shaft adapter and is frictionally engageable with the other of the pulley and the shaft adapter,
- wherein torque is transferable from the shaft adapter to the spring through the first spring end, and from the spring to the pulley through the second spring end,
- wherein torque is transferable from the pulley to the spring through the first spring end, and from the spring to the shaft adapter through the second spring end,
- wherein, when the isolator is at rest, the adapter and pulley drive surfaces are configured have positions relative to one another that are selected based on a moment of inertia of the pulley and a moment of inertia of the shaft adapter, based on a maximum torque to be transferred therebetween, and based on a material of the adapter drive surfaces and a material of the pulley drive surfaces, such that when transitioning from torque transfer from the shaft adapter to the pulley to torque transfer from the pulley to the shaft adapter, the second adapter drive surface engages the second spring end with a first kinetic energy and at a different time than the first adapter drive surface disengages from the first spring end, and the second pulley drive surface disengages from the second spring end with a second kinetic energy and at a different time than the first pulley drive surface engages the first spring end, and such that when transitioning from torque transfer from the pulley to the shaft adapter to torque transfer from the shaft adapter to the pulley the first adapter drive surface engages the first spring end with a third kinetic energy and at a different time than the second adapter drive surface disengages from the second spring end, and the first pulley drive surface disengages from the first spring end with a fourth kinetic energy and at a different time than the second pulley drive surface engages the second spring end,
- wherein the first, second, third and fourth kinetic energies are less than a selected value.
5 more elements
Dependencies are inferred from the claim text.