Vibration Decoupling Sleeve With Amplitude-Dependent Stiffness
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Solution Overview
Problem
Existing vibration-decoupling sleeves in vehicles are optimized for only one type of vibration, leading to potential damage from vibrations of different amplitudes and frequencies, and often fail to achieve ideal decoupling due to structural tolerances.
Innovation Solution
A vibration-decoupling sleeve with a sleeve-shaped core section made of elastomer material, featuring projections that narrow towards their ends, providing amplitude-dependent stiffness by reducing contact surface area for high-frequency vibrations and increasing stiffness for low-frequency vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the vibration-decoupling sleeve is made of soft material with low stiffness, then high-frequency, low-amplitude vibrations are effectively decoupled, but low-frequency, high-amplitude vibrations cause damage to the sleeve and structural parts
Solution Approach 1:
The projection geometry creates a dynamic stiffness characteristic where the contact area between the projection and abutment varies with vibration amplitude. For small amplitudes, only the tip of the projection contacts, providing low stiffness. For large amplitudes, the full projection base contacts, providing high stiffness. This dynamic adaptation resolves the contradiction between needing low stiffness for high-frequency vibrations and high stiffness for low-frequency vibrations.
Solution Approach 2:
The invention changes the geometric parameters of the projection (narrowing towards the end) to create amplitude-dependent stiffness. The varying cross-sectional area along the projection length allows the contact surface area to change based on deformation magnitude, effectively adjusting the stiffness parameter in response to different vibration conditions without requiring multiple components or active control.
2Reliability
If the vibration-decoupling sleeve is optimized for one type of vibration, then that specific vibration is decoupled effectively, but damage occurs from other vibration types
Solution Approach 1:
The projection geometry enables the single vibration-decoupling sleeve to handle multiple vibration types universally. The nonlinear stiffness characteristic allows the same component to effectively decouple both high-frequency, low-amplitude vibrations (engine vibrations) and low-frequency, high-amplitude vibrations (road-induced vibrations), eliminating the need for separate optimization for different vibration scenarios and preventing damage from any vibration type.
3Area of stationary object
If the contact surface area between the sleeve and structural parts is increased, then the sleeve can handle high-frequency vibrations better, but the stiffness increases causing poor decoupling of these vibrations
Solution Approach 1:
The projection design creates a dynamic contact surface area that adapts to vibration amplitude. During high-frequency, low-amplitude vibrations, only a small portion of the projection (the tip) contacts the abutment, maintaining low stiffness and effective decoupling. During large-amplitude vibrations, the contact area increases to the full projection base, providing the necessary stiffness support. This dynamic area adjustment resolves the contradiction between contact area and vibration decoupling effectiveness.
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 sleeve effectively decouples both high-frequency, low-amplitude vibrations from engine operation and low-frequency, high-amplitude vibrations from road conditions, thereby preventing damage to the sleeve and attached structural parts, while allowing for a higher Shore hardness for extended service life.
Implementation Method 1
a vibration-decoupling sleeve (10), in particular for motorcycles, having: i) axial end sides (12, 14) which are oriented in opposite directions; ii) a central opening (16) which is defined by a radial inner side (18); iii) an outer side (20) which delimits the vibration-decoupling sleeve (10) externally
Implementation Method 2
the groove-delimitation sides (24, 26), the radial inner side (18) and the axial end sides (12, 14) define abutments against a holding part (54), on the one hand, and against a structural part (52) to be fastened to the holding part (54), on the other hand
Data Source
AI summary
A vibration decoupling sleeve comprising: axial end sides that face in opposite directions; a central opening which is defined by a radial inner side; an outer side which delimits the vibration decoupling sleeve on the outside; and, a peripheral receiving groove on the outer side, which groove is delimited by two opposing axial groove-delimiting sides and a groove bottom, wherein the groove-delimiting sides, the radial inner side and the axial end sides define abutments against a mounting part on the one hand and, on the other hand, against a component which is to be decoupled from the mounting part in terms of vibration and is to be fastened to the mounting part. The vibration decoupling sleeve comprises a sleeve-shaped core portion made of an elastomeric material from which one or more projections project in order to form at least one of the abutments.