Bearing Outer Sleeve Calibration to Protect Elastomer Adhesion
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Solution Overview
Problem
Conventional bearings face challenges in decoupling oscillations from internal combustion engines and electric motors, limiting their service life and requiring calibration that can damage the elastomer spring, while also struggling to balance tensile and compressive stresses.
Innovation Solution
A bearing design featuring an outer sleeve with a radially recessed deformation portion and a support-surface portion, allowing for targeted calibration and reduced risk of elastomer detachment, enabling complete overmolding and increased fatigue strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the outer sleeve is compressed radially inwards during calibration to reduce tensile stresses and generate compressive preload in the elastomer spring, then the service life of the bearing is improved, but the elastomer body may become detached from the outer sleeve or the outer sleeve may be damaged
Solution Approach 1:
The deformation portion is designed with a support-surface portion that extends perpendicular to the radial direction, creating a predefined calibration surface before the calibration process begins. This preliminary structural preparation allows the outer sleeve to be compressed radially inwards during calibration while the support-surface portion prevents excessive deformation and elastomer detachment, enabling significant calibration to be performed safely.
2Strength
If the outer sleeve is compressed radially inwards during calibration to reduce tensile stresses in the elastomer spring, then the fatigue strength of the bearing is increased, but the extent of calibration must be coordinated with the desired movement play between the outer sleeve and inner sleeve
Solution Approach 1:
The deformation portion is designed with a support-surface portion that extends perpendicular to the radial direction, creating a localized calibration surface. This local structural feature allows the outer sleeve to be compressed radially inwards in a controlled manner at the deformation portion, while the support-surface portion prevents excessive deformation. This enables significant calibration to be performed to reduce tensile stresses and increase fatigue strength, while the support-surface portion ensures that the movement play between the outer sleeve and inner sleeve is maintained within desired limits.
3Stress or pressure
If the outer sleeve is compressed radially inwards during calibration to generate compressive preload in the elastomer spring, then the tensile stress in the elastomer spring is reduced, but the outer sleeve may be damaged
Solution Approach 1:
The deformation portion is designed with a support-surface portion that extends perpendicular to the radial direction, creating a predefined calibration surface before the calibration process begins. This preliminary structural preparation allows the outer sleeve to be compressed radially inwards during calibration while the support-surface portion prevents excessive deformation and potential damage to the outer sleeve, enabling significant calibration to be performed safely.
4Ease of manufacture
If the bearing is designed to allow significant calibration to reduce tensile stresses and increase service life, then the production simplicity is improved, but the risk of elastomer detachment during calibration increases
Solution Approach 1:
The deformation portion is designed with a support-surface portion that extends perpendicular to the radial direction, creating a predefined calibration surface before the calibration process begins. This preliminary structural preparation allows the outer sleeve to be compressed radially inwards during calibration while the support-surface portion prevents excessive deformation and elastomer detachment, enabling significant calibration to be performed safely and simplifying the production process.
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 design enhances the bearing's service life by minimizing tensile stresses, allowing for greater calibration without damaging the elastomer, and ensures reliable adhesion, thus improving the bearing's durability and production simplicity.
Implementation Method 1
an elastomer body, which resiliently interconnects the inner sleeve and the outer sleeve
Implementation Method 2
the outer sleeve is compressed radially inwards... the outer sleeve can be reliably completely overmolded with elastomer... significant calibration of the bearing is possible without damaging the outer sleeve
Data Source
AI summary
A bearing (1) is provided, comprising an inner sleeve (6), an outer sleeve (2), and an elastomer body (24), which resiliently interconnects the inner sleeve (6) and the outer sleeve (2), wherein the outer sleeve (2) comprises a circumferential portion (8) and at least one deformation portion (10) that is recessed radially inwards from the circumferential portion (8), and wherein the deformation portion (10) comprises a support-surface portion (12) arranged so as to be offset radially inwards relative to the circumferential portion (8) of the outer sleeve (2), wherein the support-surface portion (12) extends substantially perpendicularly to the radial direction (Ra). A method for producing a bearing is also provided.