Elastic Blade Torsional Damper with Cam Surface
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Solution Overview
Problem
Existing torsional vibration dampers with helicoidal springs in motor vehicle transmissions face issues with stiffness discontinuities, parasitic friction, and limited angular travel, which affect their ability to effectively absorb vibrations and transmit torque without complexity in production.
Innovation Solution
A torsional vibration damper using an elastic blade with a cam surface and a cam follower, which reduces susceptibility to centrifugal force and allows for increased angular travel and torque transmission capacity, with a production process that can be standardized by adapting the blade geometry and material for specific applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If helicoidal springs are arranged circumferentially in the vibration damper, then the damper can transmit torque and damp vibrations, but the springs become extremely susceptible to centrifugal force and require complex radial retention means that introduce parasitic friction
Solution Approach 1:
The invention extracts the harmful circumferential arrangement of helicoidal springs and replaces it with radial blades mounted on a hub. This removes the springs from the centrifugal force field's harmful effects while maintaining the damping function through the elastic deformation of radially extending blades.
Solution Approach 2:
The invention replaces the mechanical helicoidal spring system with a blade-based elastic deformation system. Instead of using circumferential springs that require radial retention means, the system uses radially extending blades that deform elastically under torsional load, eliminating parasitic friction from retention mechanisms.
2Strength
If the stiffness of the vibration damper is increased to transmit maximum engine torque, then torque transmission capacity improves, but the acyclism filtration efficacy decreases
Solution Approach 1:
The invention applies local quality by varying the blade geometry along its length, with different sections having different stiffness characteristics. This allows the damper to provide both high torque transmission capacity and effective vibration filtration by optimizing the elastic properties of specific blade regions for different functional requirements.
Solution Approach 2:
The invention changes the physical parameters of the damping system by using blades with varying cross-sectional dimensions, thicknesses, and material properties. This enables continuous adjustment of stiffness characteristics to simultaneously achieve high torque capacity and effective acyclism filtration without the discontinuities found in multi-gradient spring systems.
3Volume of stationary object
If the space available for helicoidal springs is limited, then the damper size is constrained, but the angular travel between input and output is also limited requiring sufficient spring stiffness
Solution Approach 1:
The invention transitions from a circumferential spring arrangement to radially extending blades, utilizing the radial dimension for angular travel. This dimensional change allows greater angular displacement within the same space constraints, as the blades can flex through larger angles without requiring additional circumferential space.
Solution Approach 2:
The invention employs dynamic blade geometry with varying thickness and cross-sectional properties along the blade length. This allows the blades to provide sufficient stiffness for torque transmission while maintaining the flexibility needed for larger angular travel, adapting their effective stiffness based on the operational 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 solution provides continuous torque transmission and damping without stiffness discontinuities, reduces parasitic friction, and allows for larger angular travel, enhancing the overall performance and production simplicity of the damper.
Implementation Method 1
an elastic blade mounted securely on the first element and provided with a cam surface; and a cam follower carried by a second element and arranged to cooperate with said cam surface. The cam surface is arranged such that, for an angular travel between the first element and the second element relative to an angular rest position, the cam follower exerts a flexion force on the elastic blade producing a reaction force able to return said first and second elements to said angular rest position.
Implementation Method 2
the cam follower exerts a flexion force on the elastic blade producing a reaction force able to return said first and second elements to said angular rest position
Data Source
AI summary
A vibration damper for a torque transmission device comprising a first element and a second element which are rotatable relative to each other around an axis of rotation X; and damping means for transmitting a torque and damping the rotational acyclisms between the first element and the second element. The damping means comprise an elastic blade mounted securely on the first element and provided with a cam surface; and the damper comprises a cam follower carried by the second element and arranged to cooperate with the cam surface. The cam surface is arranged such that, for an angular travel between the first element and the second element relative to an angular rest position, the cam follower exerts a flexion force on the elastic blade producing a reaction force able to return the first and second elements to the angular rest position.