Torque Transmission Device with Straight Elastic Members
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Solution Overview
Problem
Existing torque transmission devices for motor vehicles face issues with curved elastic members being deformed by centrifugal forces, leading to reduced vibration damping effectiveness, grease leakage, and complex structures due to pendular damping means placement.
Innovation Solution
A torque transmission device using straight elastic members arranged in series via a phasing member, with pendular masses mounted on a movable part radially outside the elastic members, eliminating the need for a sealed internal volume filled with grease and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If curved elastic members are used in the torque transmission device, then the structure can accommodate centrifugal forces, but the rigidness of the elastic members increases and vibration damping effectiveness is reduced
Solution Approach 1:
The elastic members are divided into multiple segments or leaves (multiple elastic members arranged in series) connected through phasing members. This segmentation allows each segment to deform independently, maintaining flexibility for vibration damping while collectively resisting centrifugal forces through the series arrangement.
Solution Approach 2:
Phasing members are introduced as intermediary elements between the elastic members. These phasing members coordinate the deformation of individual elastic segments, ensuring they deform in phase with each other to maximize vibration damping effectiveness while distributing the centrifugal force resistance across all segments.
2Ease of operation
If curved elastic members are used, then the structure can handle operational forces, but grease is required for lubrication which can leak and pollute other parts
Solution Approach 1:
The grease lubrication system is extracted or eliminated from the design. The patent uses elastic members that do not require grease lubrication, thereby removing the source of potential leakage and pollution while maintaining the necessary operational capabilities through the elastic deformation of the members themselves.
3Reliability
If pendular masses are placed radially outside the curved elastic members, then pendular damping efficiency is improved, but the structure becomes more complex
Solution Approach 1:
The pendular masses are merged with the existing elastic member structure. Instead of being separate components placed outside the elastic members, the pendular masses are integrated into the elastic member assembly, allowing pendular damping functionality to be achieved without adding significant structural complexity.
Solution Approach 2:
The elastic members serve multiple functions: they provide vibration damping through elastic deformation, resist centrifugal forces, and also serve as mounting structures for pendular masses. This multi-functionality eliminates the need for separate dedicated structures, reducing overall device complexity while maintaining damping efficiency.
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
This design enhances vibration damping efficiency, prevents grease leakage, and simplifies the structure while maintaining effective pendular damping, improving the overall performance and reliability of the torque transmission device.
Implementation Method 1
the curved elastic members subjected to centrifugal forces in operation
Implementation Method 2
the elastic members of each group are deformed in phase with each other
Implementation Method 3
means for pendular damping comprising pendular masses mounted in a movable manner on a movable part of the device
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a torque transmitting device for a motor vehicle, comprising a torque input element and a torque output element, elastic members (22, 23) acting against the rotation of one of the input and output elements with respect to the other and mounted between these elements, and damping means (63) comprising pendular masses (64) mounted such that they can move on a moving part of the device, radially on the outside of the elastic members (22, 23). At least one group of elastic members (22, 23) is mounted between the torque input and output elements, the elastic members (22, 23) of this group being arranged in series via a phasing member (33), the pendular masses (64) being mounted such that they can move on the torque output element or on the phasing member (33).