Activatable Torsion Damping Friction for Reverse Torque Shock Reduction
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Solution Overview
Problem
Existing torsion damping devices in motorized vehicles are inefficient as they activate friction during all phases of operation, leading to unnecessary energy dissipation and mechanical shocks, particularly during reverse torque transmission.
Innovation Solution
A torsion damping device with a friction mechanism that is only active during specific phases of operation, utilizing an actuating washer and elastic springs to control friction engagement, allowing relative rotation and preventing mechanical shocks by activating only when necessary, thus enhancing stiffness and reducing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the friction device is active during all phases of operation, then damping effect is continuously provided, but energy dissipation increases and mechanical shocks occur during reverse torque transmission
Solution Approach 1:
The friction device is designed to dynamically change its state between active and inactive based on the direction of torque transmission. The actuating washer rotates with the first rotary element during forward torque transmission, activating the friction device, but remains stationary during reverse torque transmission, deactivating the friction device. This dynamic adaptation resolves the contradiction by providing damping only when needed.
Solution Approach 2:
The friction device operates periodically based on the oscillation direction of the torsion damping device. During forward oscillation, the actuating mechanism engages the friction washers to provide damping; during reverse oscillation, the mechanism disengages the friction washers to prevent energy loss. This periodic activation pattern matches the operational requirements while minimizing unnecessary energy dissipation.
2Reliability
If the friction device is always engaged, then damping is provided during all oscillations, but mechanical shocks occur during reverse torque transmission
Solution Approach 1:
The actuating washer and friction washer assembly is designed to dynamically engage and disengage based on torque direction. During reverse torque transmission, the actuating washer does not rotate, causing the friction washers to separate from the second rotary element, thereby eliminating mechanical shocks while maintaining damping capability during forward torque transmission.
3Reliability
If friction is engaged during reverse torque transmission, then damping is provided, but energy dissipation increases unnecessarily
Solution Approach 1:
The friction damping mechanism operates periodically only during forward torque transmission phases. The actuating mechanism is designed to engage the friction washers during forward oscillation and disengage them during reverse oscillation, creating a periodic action pattern that provides damping when needed while avoiding unnecessary energy dissipation during reverse torque transmission.
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 solution effectively reduces energy dissipation and mechanical shocks by ensuring friction is only engaged during intended torque transmission directions, thereby improving the damping device's efficiency and stability, particularly during high-angle damping operations.
Implementation Method 1
an elastic device interposed between the first rotary element and the second rotary element and, when it deforms, allowing relative rotation of the first and second rotary elements about an axis of rotation
Implementation Method 2
a friction washer arranged to rub directly or indirectly against the second rotary element... so as by friction to dissipate some of the energy accumulated in the springs
Implementation Method 3
an elastic washer arranged between the axial support and the friction washer so as to exert an axial force on the friction washer in the direction of the second rotary element
Data Source
AI summary
A torsion damping device for a vehicle drivetrain includes: a first rotary element, a second rotary element, an elastic device, a friction device including an actuating washer mounted to rotate as one with a friction washer and including an actuating tab interposed circumferentially between a first end of a spring and the first rotary element so as to allow relative rotation between the actuating washer and the second rotary element when the first end of the spring is compressed by the first rotary element in the direction of a second end of the spring opposite to the first end.