Pendulum Damping Device Axial Gripping Gravity Compensation
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Solution Overview
Problem
Conventional pendular damping devices are sensitive to the force of gravity, which affects their filtering efficiency, especially when dealing with the order of excitation of a two-cylinder heat engine, and existing solutions like using springs are costly, complex, and introduce additional resonance frequencies.
Innovation Solution
A pendular damping device with a support capable of rotational movement and pendular bodies linked by a member, where rolling members exert an axial gripping force on the pendular masses to counteract gravity, reducing unwanted movements and enhancing filtering efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If springs are inserted between pendular bodies to counteract gravity, then the pendular bodies can withstand gravitational force, but the device complexity increases due to additional housings and fixing means
Solution Approach 1:
The patent combines the gravity counteraction function with the existing rolling member structure. The rolling member serves dual purposes: guiding the pendular body movement and providing gravitational counteraction through its axial gripping force, eliminating the need for separate spring mechanisms and housings.
Solution Approach 2:
The rolling member generates its own axial gripping force through the friction between its surface and the pendular body, without requiring external power sources or additional actuating mechanisms. The rotational movement of the rolling member automatically produces the necessary force to counteract gravity.
2Force
If springs are inserted to counteract gravity, then gravitational effects are reduced, but additional resonance frequencies appear affecting filtering efficiency
Solution Approach 1:
The patent replaces the spring-based mechanical system with a friction-based axial gripping mechanism. This substitution eliminates the elastic resonance characteristics of springs while maintaining the gravitational counteraction function, thereby avoiding additional resonance frequencies that would interfere with the damping device's filtering performance.
3Force
If open cutouts are formed in the support to insert springs, then springs can be installed, but the travel of pendular bodies is reduced
Solution Approach 1:
The patent integrates the gravity counteraction function into the existing rolling member-guided movement path, eliminating the need for separate spring installation spaces. The rolling member's axial gripping force is generated within the existing structural envelope, preserving the full travel range of the pendular bodies.
4Device complexity
If conventional pendular damping devices are used, then the structure is simple, but gravity causes undesirable movements reducing filtering efficiency
Solution Approach 1:
The rolling member automatically generates axial gripping force through its rotational movement and friction interaction with the pendular body, without requiring external control systems or additional components. This self-service mechanism effectively counteracts gravity while maintaining the overall simplicity of the device structure.
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 axial gripping mechanism effectively reduces the influence of gravity on pendular bodies, improving the filtering of engine vibrations without the need for additional housings or complex spring systems, thereby enhancing the overall efficiency and reducing maintenance concerns.
Implementation Method 1
the rolling member exerting an axial gripping force on at least one of the pendular masses during the movement thereof relative to the support
Implementation Method 2
at least one rolling member guiding the movement of the pendular body relative to the support, the rolling member cooperating on the one hand with a rolling track integral to the support and on the other hand with a rolling track integral to the pendular body
Implementation Method 3
the pendular damping device can be incorporated in a torsion damping system of a clutch capable of selectively linking the heat engine to the gearbox, in order to filter the vibrations due to the acyclisms of the engine
Data Source
AI summary
A pendulum damping device including a mounting to rotate about an axis; at least one pendulum body that includes first and second pendulum masses axially spaced relative to each other and movable relative to the mounting, the first pendulum mass being axially placed on a first side of the mounting and the second pendulum mass being axially placed on a second side of the mounting, and at least one member to connect the first and second pendulum masses and couple the masses; and at least one rolling member that guides the movement of the pendulum body relative to the mounting. The rolling member engages with a rolling track secured to the mounting and with a rolling track secured to the pendulum body and defined by the connecting member. The rolling member exerts an axial clamping force on one of the pendulum masses during movement of the one pendulum mass relative to the mounting.