Pre-Loaded Sensor Shell Bearings to Reduce Gyroscope Runout
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Solution Overview
Problem
Downhole drilling sensors, particularly MEMS-type gyroscopic sensors, experience error-inducing movements due to slack in bearings and runout, leading to reduced measurement accuracy and repeatability during directional drilling operations.
Innovation Solution
A system with pre-loaded bearings is employed to stabilize the MEMS-type gyroscope, using biasing elements to apply compressive forces on thrust bearings, reducing slack and wobble, and ensuring accurate rotational motion transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional bearings are used to support the MEMS-type gyroscope, then the device complexity is reduced, but measurement precision deteriorates due to slack and runout
Solution Approach 1:
The bearing is pre-loaded before operation using a compression element that applies a preliminary force to eliminate clearance and slack in the bearing. This preliminary action ensures that the bearing operates without play, thereby improving measurement precision of the MEMS-type gyroscope.
Solution Approach 2:
The bearing's operational parameters are changed by applying a pre-loading force that modifies the contact conditions between bearing elements. This parameter change eliminates runout and slack, transforming the bearing from a loose-fitting component to a precision-fit component that maintains stable rotational characteristics.
2Measurement precision
If pre-loaded bearings are implemented, then measurement precision is improved, but device complexity increases due to additional components
Solution Approach 1:
The biasing element is pre-installed and pre-loaded into the bearing assembly during manufacturing or assembly, performing the pre-loading action beforehand. This eliminates the need for complex adjustment mechanisms during operation, improving measurement repeatability while keeping the overall structure manageable.
Solution Approach 2:
A biasing element serves as an intermediary component that mediates between the stationary housing and the rotating bearing assembly. This intermediary applies the necessary pre-loading force through a simple mechanical structure, achieving precision improvement without proportionally increasing device complexity.
3Reliability
If slack in bearings is present, then device complexity is minimized, but reliability deteriorates due to error-inducing movements
Solution Approach 1:
The bearing is pre-loaded with a compression element that applies a preliminary force to eliminate clearance and slack in the bearing. This preliminary action ensures that the bearing operates without play, thereby improving measurement precision of the MEMS-type gyroscope.
Solution Approach 2:
The bearing's operational parameters are changed by applying a pre-loading force that modifies the contact conditions between bearing elements. This parameter change eliminates runout and slack, transforming the bearing from a loose-fitting component to a precision-fit component that maintains stable rotational characteristics.
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 pre-loaded bearings significantly improve the accuracy and repeatability of measurements by minimizing error-inducing movements, enhancing the precision of directional drilling operations.
Implementation Method 1
A sensor support apparatus includes a shell configured to encompass a MEMS-type gyroscope. A secondary shaft is connected to a connection arm of a primary shaft and extends through the shell. One or more bearings support rotation of the shell. The apparatus further includes a means for pre-loading the one or more bearings.
Data Source
AI summary
Devices, systems, and methods for stabilizing a gyroscopic sensor include bearings supporting a MEMS-type gyroscope located in a shell. The shell rotates around a secondary shaft connected to an extension arm of a primary shaft. A biasing element pre-loads thrust bearings on either side of the shell against the extension arm, which can limit motion of the shell during operation of the sensor, thereby improving measurements made by the sensor.