Torsional Damper with Dual Spring Sets for Broadband Vibration Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing torsional vibration dampers are insufficient in isolating torsional vibrations across a broader range of frequencies, particularly at lower engine operating speeds and frequencies, in engines with rolling cylinder deactivation strategies.
Innovation Solution
A damper system incorporating a hydraulically actuated clutch with two sets of springs, where the first set is engaged at higher engine speeds to reduce torsional vibrations and the second set with different spring constants is activated at lower speeds to act as a dynamic absorber, effectively isolating vibrations across a broader frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single size spring design vibration damper is used, then the structure is simple and manufacturing is easy, but it is insufficient to isolate torsional vibrations across a broader range of frequencies particularly at lower engine operating speeds
Solution Approach 1:
The vibration damper is segmented into multiple spring sets (first spring set and second spring set) with different spring constants, where each spring set targets specific frequency ranges. The first spring cage and second spring cage are independently rotatable relative to each other, allowing each spring set to operate effectively at different engine speeds and vibration frequencies, thereby resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The system dynamically switches between different spring sets based on operating conditions. The first and second spring cages can rotate independently, and the friction plates engage or disengage different spring sets depending on the vibration frequency and engine speed, making the damper adaptable to varying operational requirements without requiring a completely different design for each frequency range.
2Adaptability or versatility
If multiple spring sets with different spring constants are used to cover broader frequency range, then vibration isolation effectiveness is improved, but the device complexity increases
Solution Approach 1:
The vibration damper is segmented into multiple spring sets (first spring set and second spring set) with different spring constants, where each spring set targets specific frequency ranges. The first spring cage and second spring cage are independently rotatable relative to each other, allowing each spring set to operate effectively at different engine speeds and vibration frequencies, thereby resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The single vibration damper device performs multiple functions by incorporating both first and second spring sets that can be selectively engaged. The same physical structure handles both high-frequency vibrations (via first spring set) and low-frequency vibrations (via second spring set), making the device universally effective across the entire operating range without requiring separate dampers for different frequency ranges.
3Reliability
If known torsional dampers are used in engines with rolling cylinder deactivation strategy, then the basic vibration damping function is provided, but the dampers are insufficient to isolate increased vibrational magnitude at lower engine operating speeds
Solution Approach 1:
The system dynamically switches between different spring sets based on operating conditions. The first and second spring cages can rotate independently, and the friction plates engage or disengage different spring sets depending on the vibration frequency and engine speed, making the damper adaptable to varying operational requirements including rolling cylinder deactivation strategies.
Solution Approach 2:
The system changes the effective spring constant parameter based on operating conditions. At lower engine speeds with higher vibration magnitude, the second spring set with appropriate spring constant is engaged. At higher engine speeds, the first spring set is engaged, thereby adapting the vibration isolation characteristics to match the current operating regime and maintaining reliability across all conditions.
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
The damper system effectively reduces torsional vibrations across a wider range of frequencies by utilizing the first set of springs at higher engine speeds and the second set at lower speeds, enhancing vibration isolation and reducing energy transfer between the engine and transmission.
Implementation Method 1
A first spring set having multiple first springs connected to the first spring cage... A second spring set having multiple second springs connected to the second spring cage... wherein the multiple second springs of the second spring set are deflected by axial rotation between the first cage section and the second cage section
Implementation Method 2
A frictional clutch is incorporated with a turbine damper system to reduce torsional vibration of an engine
Data Source
AI summary
A damper system includes a turbine shaft rotatably connected to a torque converter having a clutch. A hydraulically actuated clutch is coupled to the turbine shaft. A first spring cage has a first cage portion connected to the hydraulically actuated clutch and a second cage portion connected to a friction plate. A first spring set is connected to the first and second cage portions. Springs of the first spring set are deflected by axial rotation between the first and second cage portions when the torque converter clutch is engaged. A second spring cage has a first cage section connected to the hydraulically actuated clutch and a second cage section connected to a torque converter turbine. A second spring set has second springs having a spring constant different than the first spring set. The second spring set springs are deflected by axial rotation between the first and second cage sections.