Variable Lever Arm Torque Coupling for Noise Reduction
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Solution Overview
Problem
Existing torque transfer devices in automotive and turbo machinery applications often experience unwanted noise and harshness due to incorrect synchronization of rotating components, and can get stuck in a blocked shift state due to mismatched geometry profiles and slip speeds.
Innovation Solution
A selective torque transfer device with an input shaft and hub, a slider that moves transversely within the hub, and an output shaft and hub connected by a link, allowing torque transfer based on slider displacement from the axis, with features like compression springs, bearings, and counterweights to manage eccentric masses and axial movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clutches and torque converters are used to couple or decouple torque source from torque shaft, then torque transfer is achieved, but incorrect synchronization causes unwanted noise and harshness
Solution Approach 1:
The patent employs a dynamic synchronization mechanism where the geometry profile of the coupling components is designed to adaptively change during the engagement process. The sync ring with its specific geometric profile dynamically adjusts the engagement timing and force distribution, allowing the system to synchronize rotating components smoothly while minimizing noise and harshness during torque transfer operations.
Solution Approach 2:
The invention utilizes parameter changes in the geometry profile of the coupling components, particularly the sync ring, to control the engagement characteristics. By optimizing the geometric parameters such as tooth profile, engagement angle, and force distribution curves, the system achieves reliable torque transfer while reducing harmful noise and harshness effects during synchronization.
2Reliability
If geometry profile and force are applied to engage rotating and non-rotating components, then torque transfer is enabled, but blocked shift occurs when synchronization is incorrect
Solution Approach 1:
The patent implements a preliminary synchronization action through the sync ring mechanism before full torque transfer engagement. The geometry profile is designed to first establish rotational synchronization between components at reduced force levels, then progressively increase engagement force once synchronization is achieved, preventing blocked shift conditions by ensuring proper timing and alignment before full load engagement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables smooth and controlled torque transfer between rotating and non-rotating components, reducing noise and preventing stuck states by adjusting torque transfer based on slider position and centrifugal forces, while maintaining mechanical connection in both coupled and uncoupled positions.
Implementation Method 1
The amount of torque transferred from the input hub to the output hub is a function of the distance between the slider and the axis of the input shaft
Implementation Method 2
The compression spring biases the slider to a position that is substantially in line with the axis of the input shaft and provides resistance to the movement of the slider away from the axis of the input shaft
Implementation Method 3
a bearing disposed on the output shaft that is connected to the output hub and is configured to provide axial movement of the output hub along the output shaft
Implementation Method 4
a counterweight disposed adjacent to the link and the output hub, such that the counterweight is configured to counteract the eccentric mass of the shoulder
Data Source
AI summary
A selective torque transfer device is provided to transfer torque between one rotating component and a decoupled non-rotating component. The torque transfer device has an input shaft that extends along an axis and is connected to an input hub. The input shaft and input hub rotate about the axis on which they extend. A slider is disposed within the input hub and is capable of moving in a direction transverse to the axis. An output shaft extends along the axis and is connected to an output hub. The output shaft and output hub rotate about the axis on which they extend when the selective torque transfer device is in the engaged position. A link pivotally connects the output hub to the slider. The input hub is configured to rotate about its axis to create a torque.