Bearing Torque Measurement via External Extension Arm
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Solution Overview
Problem
Current methods are inadequate for accurately measuring the exclusive torque and whirling motion of bearings, particularly in cyrogenic environments, which are crucial for evaluating durability but are challenging due to extreme conditions and limited accessibility.
Innovation Solution
A bearing test apparatus is designed with a chamber, bearing cap, driving shaft, extension arm, and measurement arm to measure torque and whirling motion, incorporating a load cell, pre-load member, and optical displacement sensors, along with a cooling fluid system to maintain a cyrogenic environment and minimize measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing measurement methods are used for bearing torque, then measurement can be performed, but measurement precision deteriorates due to errors from cooling fluid supply paths and environmental factors
Solution Approach 1:
The measurement system is segmented into separate functional components: the bearing cap isolated within the chamber, the extension arm transmitting force, and the measurement arm with load cell outside the chamber. This segmentation isolates the measurement mechanism from harmful environmental factors including cooling fluid supply paths, enabling precise torque measurement without interference from thermal or fluid dynamics effects.
2Reliability
If bearing is tested in cyrogenic environment, then durability evaluation under actual service conditions is improved, but measurement becomes difficult due to extreme temperature conditions and limited accessibility
Solution Approach 1:
The extension arm acts as an intermediary element that transmits the rotation force from the bearing cap through the chamber wall to the measurement arm located outside the chamber. This intermediary mechanism enables force transmission and measurement in cyrogenic environments where direct measurement would be difficult, allowing durability evaluation under extreme conditions while maintaining measurement accessibility through the chamber wall.
Solution Approach 2:
The patent replaces complex in-situ measurement systems with a mechanical leverage system using the extension arm and measurement arm. Instead of using sophisticated sensors inside the cyrogenic chamber, the system uses mechanical force transmission through the extension arm to a load cell positioned outside the chamber, simplifying the measurement approach while enabling accurate torque measurement in extreme temperature conditions.
3Measurement precision
If measurement components are placed inside chamber, then direct measurement is possible, but device complexity increases and measurement errors from environmental factors increase
Solution Approach 1:
The measurement components (measurement arm and load cell) are extracted from inside the chamber and positioned outside. The extension arm serves as a transmission mechanism that carries the rotation force from the bearing cap through the chamber wall to the external measurement system. This extraction eliminates the need for complex sealed measurement systems inside the chamber while maintaining measurement precision and reducing device 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
Enables efficient and accurate measurement of exclusive torque and whirling motion, even in extreme cyrogenic conditions, improving the evaluation of bearing durability and reducing measurement errors caused by environmental factors.
Implementation Method 1
an exclusive torque of the test bearing is obtained by measuring a force applied to the measurement arm by the extension arm when a rotation force is applied to the bearing cap by the outer wheel
Implementation Method 2
configured to measure a whirling motion of a cage
Implementation Method 3
a cooling fluid tube formed through the bearing cap to introduce a cooling fluid into the first inner space
Implementation Method 4
introduce a cooling fluid into the first inner space
Data Source
AI summary
A bearing test apparatus for testing a test bearing, including a chamber, a bearing cap disposed in the chamber and coupled to an outer wheel of the test bearing, a driving shaft connected to an inner wheel of the test bearing to rotate the inner wheel, an extension arm extending in a radial direction of the bearing cap from the bearing cap to expose one end thereof out of the chamber, and a measurement arm configured to make a contact with one end of the extension arm and configured to be rotatable by the extension arm. When a rotation force is applied to the bearing cap by the outer wheel, the extension arm is used to measure a force applied to the measurement arm, which is used to obtain an exclusive torque of the test bearing.