Torsion Damping Device With Phase Washers
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Solution Overview
Problem
Existing torsion damping devices in motor vehicle temporary coupling systems experience parasitic noise due to unstressed elastic members sliding circumferentially, which compromises noise pollution control and operational silence.
Innovation Solution
The damping device features elastic members constrained between phasing and radial faces of phasing washers, ensuring all members are held in place, with phasing washers connected to the turbine wheel and input element linked to the lock-up clutch, allowing only downstream members to be stressed during torque transmission, preventing upstream elastic members from sliding and causing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic members are mounted in series between input and output elements in a torsion damping device, then the device can effectively dampen engine vibrations, but the unstressed elastic members may slide circumferentially causing parasitic noise
Solution Approach 1:
The patent segments the elastic members into upstream and downstream groups with distinct functional roles. The upstream elastic members are dedicated to radial positioning and preventing circumferential sliding, while the downstream elastic members handle torque transmission. This segmentation allows each group to optimize its function without compromising the other, eliminating the noise issue while maintaining vibration damping performance.
Solution Approach 2:
The patent introduces an intermediary structure (the specific mounting arrangement of elastic members between phasing washers and retaining faces) that mediates between the input element and output element. This intermediary configuration ensures that unstressed elastic members are positively positioned and cannot slide circumferentially, thereby preventing noise while still allowing stressed members to transmit torque effectively.
2Object-generated harmful factors
If the circumferential distance between phasing face and retaining face is equal to the elastic element length at rest, then all elastic members are held in place preventing sliding noise, but the device complexity increases
Solution Approach 1:
The patent applies dynamics by allowing the elastic members to transition between different stress states (stressed and unstressed) during operation. The upstream elastic members remain in an unstressed state for positioning, while downstream members become stressed during torque transmission. This dynamic functional differentiation simplifies the overall structure compared to designs where all members must be continuously constrained.
Solution Approach 2:
The patent applies local quality by giving different functional characteristics to different groups of elastic members. The upstream elastic members are positioned to prevent circumferential sliding, while the downstream elastic members are positioned to transmit torque. This localized functional assignment allows each group to be optimized for its specific role, reducing the need for complex overall constraints.
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 configuration effectively dampens engine vibrations, reducing noise pollution and ensuring silent operation by maintaining upstream elastic members in a non-stressed, immobilized state during torque transmission, thus enhancing the torsion damping performance.
Implementation Method 1
The torsional damping device generally includes circumferentially acting elastic elements that are interposed between a torque input element and a torque output element
Implementation Method 2
a hydrodynamic converter equipped with such a damping device... comprising a turbine wheel and a locking clutch
Data Source
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AI summary
A torsion damping device (10) of an automotive temporary coupling system, comprising: a torque input element (12A, 12B) and a torque output element (18); an upstream circumferentially acting elastic member (36A) capable of being loaded by or of loading the input element (12A, 12B); a downstream circumferentially acting elastic member (36B) capable of loading or of being loaded by the output element (18); a radial phase washer (40A, 40B) arranged so that the two elastic members (36A, 36B) are mounted in series; each elastic member (36A, 36B) is received circumferentially between a phasing face (50A, 50B) and an oppositely located radial retention face (52B, 52A) of the phase washer (40A, 40B), the circumferential distance (D) between said faces (50A, 50B, 52B, 52A) being equal at most to the circumferential length of the elastic member at rest.