Torque Converter Cover Mass Integration for Vibration Damping
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Solution Overview
Problem
Existing torque transmission systems with vibration dampers and planetary gear sets do not effectively increase absorber mass, as the mass of the cover is not included in the absorber mass, limiting vibration damping capacity.
Innovation Solution
A torque transmission apparatus with a vibration damper and a torque converter that includes a planetary gear set, where the input torque is split at the vibration damper and the cover is non-rotatably connected to the output part, incorporating a ring gear and a planetary carrier connected to the output hub, enhancing absorber mass and vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If torque is split inside the torque converter, then the mass of the cover is not included in the absorber mass, but the structural complexity is reduced
Solution Approach 1:
The torque transmission path is segmented into multiple independent paths: one path goes through the vibration damper and planetary gear set, while another path goes directly through the cover to the output hub. This segmentation allows the cover mass to be included in the absorber mass while maintaining structural simplicity.
Solution Approach 2:
A first vibration damper is introduced as an intermediary component between the input shaft and the planetary gear set. This damper splits the torque and allows the cover mass to be effectively included in the absorber mass without requiring complex structural modifications to the torque converter.
2Weight of moving object
If the absorber mass is increased by including cover mass, then the vibration damping capacity is improved, but the device complexity increases
Solution Approach 1:
The cover and output hub are merged into a single non-rotatably connected assembly, allowing the cover mass to be automatically included in the absorber mass without adding separate components. This merging approach increases absorber mass while avoiding additional device complexity.
Solution Approach 2:
The cover serves multiple functions: it provides structural support for the torque converter and simultaneously acts as part of the absorber mass for vibration damping. This multi-functionality increases absorber mass without requiring dedicated additional components for vibration damping.
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
Significantly increases the absorber mass and vibration damping capacity by including the cover mass in the absorber mass, providing improved torque transmission and reduced engine vibrations.
Implementation Method 1
at least one first spring engaged with the first input and output parts
Implementation Method 2
a vibration damper with an input part arranged to receive torque from an engine, an output part; and at least one spring engaged with the input and output parts
Implementation Method 3
a planetary gear set including a ring gear non-rotatably connected to the turbine shell and a planetary carrier non-rotatably connected to the output hub
Implementation Method 4
EP 2 374 001 B1 discloses use of a planetary gear set within a torque converter having a vibration damper
Implementation Method 5
a torque converter including an impeller with at least one first blade and an impeller shell, a turbine with at least one second blade and a turbine shell
Implementation Method 6
Converter 400 includes torque converter clutch 402. When clutch 402 is closed, torque from cover 404 is split into one path to vibration damper 406 and another path to carrier 408
Data Source
AI summary
A torque transmission apparatus, including: a first vibration damper with a first input part arranged to receive torque from an engine, a first output part and at least one first spring engaged with the first input and output parts; and a torque converter including a cover non-rotatably connected to the first output part, an impeller with at least one first blade and an impeller shell non-rotatably connected to the cover, a turbine with at least one second blade and a turbine shell, an output hub and a planetary gear set including a first component non-rotatably connected to the turbine shell or a second component non-rotatably connected to the output hub.