Pendular Damping Assembly With Progressive End-Stop Shock Absorption
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Solution Overview
Problem
Conventional pendulum damping devices in motor vehicle transmission systems are inadequate in effectively damping shocks between the support and pendulum assemblies, leading to noise and wear issues.
Innovation Solution
A pendulum damping device with a radial protrusion that passes through an opening in the end-stop damping system, allowing direct contact between the pendulum assembly and the support, which reduces the risk of rolling member loss or jamming and optimizes shock absorption, while the end-stop damping system is borne directly by the pendulum assembly to enhance durability and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastomer is interposed between the rivet and the support to damp shocks, then some shock absorption is achieved, but the damping is insufficient and noise and wear issues persist
Solution Approach 1:
The invention changes the parameters of the damping system by introducing a progressive damping mechanism. The elastomer element provides initial soft damping for minor shocks, while the metal-to-metal contact through the radial protrusion provides hard damping for severe shocks. This multi-level damping approach fundamentally changes the damping characteristics from single-stage to progressive, effectively addressing both minor and major shock conditions.
Solution Approach 2:
The invention employs a composite damping system combining two different materials with distinct properties: an elastomer element for elastic deformation and energy absorption, and metal components for rigid structural support and direct contact. This composite approach leverages the advantages of both materials - the elastomer's shock absorption capability and the metal's durability and direct contact ability - to achieve superior overall damping performance.
2Duration of action of stationary object
If the end-stop damping system is borne by the pendulum assembly rather than the support, then durability and cost-effectiveness are improved, but the system must withstand higher direct loads
Solution Approach 1:
The invention applies beforehand cushioning by positioning the elastomer element to engage first during shock events. This elastomer cushion absorbs the initial impact energy and reduces the peak load transmitted to the metal-to-metal contact interface. The radial protrusion is designed to only engage after the elastomer is fully compressed, providing a progressive load path that protects the pendulum assembly from excessive direct loads while extending system life.
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 noise and shock associated with radial falls, prolongs the life of the damping system, and optimizes shock absorption while minimizing costs by ensuring direct contact and uniform compression, thus improving the overall performance of the damping device.
Implementation Method 1
equipping each rivet that connects the two pendulum masses of this pendulum assembly with the elastomer, this elastomer then being interposed between the rivet and the support upon such an arrival in the position of abutment
Implementation Method 2
the pendulum assembly comprises at least one radial protuberance designed to pass at least partially through an opening made in the end-stop damping system
Implementation Method 3
The movement of a pendulum assembly with respect to the support is generally guided by two rolling members each one collaborating with a runway track of the support and a pendulum-assembly runway track. The runway tracks of the support and of the pendulum assembly extend in such a way that, in service, the rolling members bear centrifugally and centripetally on said runway tracks respectively.
Data Source
AI summary
A pendulum damping device incorporated into a drive train of a motor vehicle, notably into a clutch, includes a support capable of rotational movement about an axis of rotation, a pendulum assembly of which the movement with respect to the support is guided by at least one rolling member, and an end-stop damping system borne directly by the pendulum assembly and able at least to damp the coming of said pendulum assembly into a position of abutment against the support of said pendulum assembly during the radial fall and/or saturation of this said pendulum assembly. The pendulum assembly also includes at least one radial protuberance designed to pass at least partially through an opening made in the end-stop damping system.