Coated Interlayer Plate for Driving Wheel Bearing Noise
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Solution Overview
Problem
Existing driving-wheel bearing devices suffer from stick-slip noise and reduced axial force due to deformation and corrosion of interposed plates, which impair anti stick-slip properties and durability, and face issues with coating adhesion and wear.
Innovation Solution
A driving-wheel bearing device with a plate having a molybdenum coating layer or fluorine-resin coating layer, thickness between 0.5 mm to 2 mm, and surface roughness of Rz=0.2˜15.0, interposed between the shoulder portion of the outer joint member and the inner member, to reduce frictional resistance and prevent abrupt sliding, while maintaining axial force and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a plate is interposed between the shoulder portion of the outer joint member and the inner member to reduce friction, then stick-slip noise is reduced, but the plate deforms and corrodes over time, reducing axial force and anti stick-slip properties
Solution Approach 1:
The invention changes the surface parameters of the plate by forming a coating layer with specific surface roughness (Rz 0.8-5.0 μm) and applying lubricant, which modifies the friction characteristics and prevents stick-slip noise without compromising the plate's structural integrity and axial force over time
Solution Approach 2:
The invention uses a composite structure consisting of a plate substrate with a coating layer formed on its surface. This composite material provides both the mechanical strength needed to maintain axial force and the surface properties (roughness and lubricity) needed to prevent stick-slip noise, thereby resolving the contradiction between noise reduction and reliability
2Duration of action of stationary object
If a coating layer is applied to the plate to reduce wear, then coating adhesion and wear resistance are improved, but coating peeling and early wear occur if surface roughness is not controlled
Solution Approach 1:
The invention optimizes the surface roughness parameter of the plate to a specific range (Rz 0.8-5.0 μm) before forming the coating layer. This parameter control ensures optimal adhesion between the coating and substrate, preventing peeling and early wear while maintaining wear resistance and coating durability
Solution Approach 2:
The invention performs preliminary surface treatment to control the surface roughness before applying the coating layer. This preliminary action of preparing the surface with appropriate roughness ensures that the coating adheres properly and resists peeling and wear throughout the service life of the bearing device
3Volume of moving object
If the plate thickness is reduced to achieve compact design, then the bearing device becomes more compact, but the plate deforms more easily under axial force, reducing anti stick-slip properties
Solution Approach 1:
The invention uses a composite material structure with a coating layer on the plate that provides enhanced surface properties without significantly increasing thickness. This allows the plate to maintain adequate thickness for structural integrity and axial force while achieving compact overall design
Solution Approach 2:
The invention optimizes the plate thickness parameter within a specific range and combines it with controlled surface roughness and lubricant application. This parameter optimization allows the plate to resist deformation under axial force while maintaining compact bearing device dimensions
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 prevents stick-slip noise, secures anti stick-slip properties over a long period, and enhances the durability and compact design of the bearing device by maintaining axial force and reducing coating wear.
Implementation Method 1
a plate having a molybdenum coating layer or a fluorine-resin coating layer formed thereon and having a plate thickness ranging from 0.5 mm to 2 mm is interposed between opposite surfaces of a shoulder portion of the outer joint member and an end portion of the inner member
Data Source
AI summary
A driving-wheel bearing device includes an outer race having double-row outer raceway surfaces formed on an inner periphery thereof, a hub wheel and an inner race having a wheel attachment flange at one end thereof and double-row inner raceway surfaces on an outer periphery thereof, and double-row rolling elements interposed between the outer raceway surfaces of the outer race and the inner raceway surfaces of the hub wheel and the inner race, the hub wheel having a shaft hole into which a stem section extending from an outer joint member of a constant velocity universal joint is spline-fitted by being press-fitted, in which a plate having a molybdenum coating layer or a fluorine-resin coating layer formed thereon and having a plate thickness ranging from 0.5 mm to 2 mm is interposed between opposite surfaces of a shoulder portion of the outer joint member and an crimped portion of the hub wheel.