Bearing Assembly Thermal Compensation via Intermediate Ring
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Solution Overview
Problem
Bearing assemblies with axial preload or clearance are adversely affected by temperature changes, leading to unintended changes in preload or clearance, which can result in wear and misalignment of components.
Innovation Solution
Incorporating an intermediate ring with a higher thermal expansion coefficient, typically made of plastic like fluorinated rubber, between conical abutment surfaces of metallic bearing rings and housing, allowing for precise axial movement compensation during thermal changes, while preventing rotation and wear through anti-creep mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two rolling-element bearings are preloaded axially against each other to achieve clearance-free supporting, then the supporting precision is improved, but the preload changes adversely with temperature changes
Solution Approach 1:
The patent utilizes the thermal expansion of the intermediate ring made of plastic material to compensate for temperature-induced changes in bearing preload. The plastic material expands or contracts with temperature changes, maintaining constant preload on the rolling-element bearings despite thermal variations in the overall assembly.
Solution Approach 2:
The patent employs a composite structure combining metal bearing rings with a plastic intermediate ring. The metal components provide structural strength and dimensional stability, while the plastic intermediate ring provides thermal compensation through its higher thermal expansion coefficient, creating a composite system that addresses both mechanical and thermal requirements.
2Strength
If metallic materials are used for bearing rings and housing, then the strength and durability are improved, but the thermal expansion mismatch causes preload changes
Solution Approach 1:
The patent exploits the difference in thermal expansion coefficients between metal and plastic materials. The plastic intermediate ring has a higher thermal expansion coefficient than the metal bearing rings, allowing it to compensate for thermal contraction of the metal components and maintain constant preload across temperature variations.
Solution Approach 2:
The patent creates a composite assembly combining metal bearing rings with a plastic intermediate ring. This composite structure leverages the high strength of metal and the high thermal expansion coefficient of plastic to achieve both structural integrity and thermal compensation simultaneously.
3Stability of the object's composition
If an intermediate ring made of plastic with high thermal expansion coefficient is introduced, then the thermal compensation is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a plastic intermediate ring as a mediator between the metal bearing rings. This intermediate component absorbs thermal expansion differences and maintains constant preload, acting as a buffer that simplifies the overall system by providing passive thermal compensation without complex control mechanisms.
Solution Approach 2:
The patent uses the thermal expansion properties of plastic material to create a simple, passive compensation mechanism. The intermediate ring automatically adjusts its dimensions with temperature changes, providing preload stabilization without requiring active control systems or complex mechanical arrangements.
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
Maintains constant axial preload or clearance in rolling-element bearings across temperature changes, reducing wear and ensuring optimal operating conditions by utilizing materials with different thermal expansion coefficients and conical surfaces for sliding compensation.
Implementation Method 1
the intermediate ring is comprised of a material that has a higher thermal expansion coefficient compared to the metallic material of the second machine part and of the bearing ring
Implementation Method 2
The conical surfaces act as sliding surfaces, on which a sliding movement can take place if different thermally induced expansions arise
Data Source
AI summary
A bearing assembly is configured to rotatably support a first machine part in a second machine part and includes first and second rolling-element bearings. The rolling-element bearings are installed in the bearing assembly with an axial preload or an axial clearance. The second machine part includes a first conical abutment surface, and the first rolling-element bearing includes a bearing ring having a second conical abutment surface facing the first conical abutment surface of the second machine part. An intermediate ring is disposed between and abuts the first and second conical abutment surfaces. The bearing ring and the second machine part are metal, and the intermediate ring is formed from a material that has a higher coefficient of thermal expansion than that of the bearing ring and second machine part.