Resin Sensor Housing Creep Reduction in Rolling Bearings
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Solution Overview
Problem
Existing rolling bearing sensor housings made of polymer alloys, while reducing creep due to temperature changes, require further improvement in creep resistance to enhance sensor output accuracy and precision.
Innovation Solution
A rolling bearing with a rotation sensor featuring a resin sensor housing composed of polyphenylene sulfide, calcium carbonate as an inorganic filler, and glass fiber, with calcium carbonate content between 20-30% and glass fiber content between 20-30% by weight, providing improved thermal stability and creep resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer alloy of polyphenylene sulfide with polyamide and polyimide is used for the sensor housing, then creep due to temperature change is reduced to a certain degree, but further improvement in creep resistance is required to enhance sensor output accuracy
Solution Approach 1:
The patent uses a composite material consisting of polyphenylene sulfide as the base resin, reinforced with glass fibers (20-30 wt%) and inorganic fillers (20-30 wt%, preferably calcium carbonate). This composite structure provides superior creep resistance and thermal stability compared to conventional polymer alloys, directly resolving the contradiction by achieving both high reliability and compositional stability.
Solution Approach 2:
The patent optimizes the compositional parameters of the resin material by specifying precise weight percentage ranges for glass fibers (20-30%) and inorganic fillers (20-30%). This parameter optimization ensures the sensor housing achieves the required creep resistance and thermal stability for high-accuracy sensor output, transforming the material properties to meet the contradictory requirements.
2Stability of the object's composition
If glass fiber and inorganic filler are added to the resin, then creep resistance is improved, but the complexity of material composition increases
Solution Approach 1:
The patent simplifies the material composition complexity by specifying precise parameter ranges: glass fiber content of 20-30 wt% and inorganic filler content of 20-30 wt%. These defined parameters provide a clear manufacturing guideline that balances creep resistance improvement with material composition manageability, resolving the contradiction between enhanced stability and reduced complexity.
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 significantly reduces creep and thermal instability, enhancing sensor accuracy and enabling high-resolution applications, while also simplifying production by reducing the need for polyamide and polyimide materials and minimizing resin composition usage.
Implementation Method 1
A magnetic encoder alternately magnetized in opposite polarities in its circumferential direction and mounted on the rotating race... A magnetic sensor configured to detect the changes in the magnetic flux when the magnetic encoder is rotated
Data Source
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AI summary
An object of the present invention is to provide a sensor housing in which the effect of reducing the creep of the sensor housing due to temperature change is further improved. A rolling bearing with a rotation sensor includes: an inner race: an outer race, wherein one of the inner race and the outer race is a rotating race and the other is a stationary race; an annular magnetic encoder (6) alternately magnetized in opposite polarities in its circumferential direction and mounted on the rotating race; a magnetic sensor (7) configured to detect the changes in magnetic flux when the magnetic encoder (6) is rotated; and a resin sensor housing (9) in which is mounted the magnetic sensor (7) and mounted on the stationary race. In this rolling bearing with a rotation sensor, the sensor housing (9) is made of a resin material including a resin composition containing polyphenylene sulfide, an inorganic filler, and glass fiber.