Elastic Bearing Connection for Space Rotation Positioning
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Solution Overview
Problem
Existing rotational pointing devices for space applications face challenges in achieving long lifespan due to friction and lubrication issues, particularly during micro-movements, leading to reduced operational cycles and limited angular displacement capabilities.
Innovation Solution
A rotational positioning device with an elastic connection between the fixed and rotating parts of a ball or roller bearing, allowing for large-amplitude movements during deployment and transitioning to low-amplitude, frictionless movements during fine pointing, utilizing flexible arms to deform and maintain precise positioning without bearing stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If rolling bearings or ball joints are used for rotational movements, then large amplitude angular displacements are achieved, but lifespan is greatly degraded due to friction and lubrication issues
Solution Approach 1:
The device segments the rotational movement into two distinct phases: deployment phase (large amplitude) and fine pointing phase (small amplitude). During deployment, the bearing handles large rotations. During fine pointing, the elastic connection absorbs small movements independently, preventing the bearing from undergoing repeated micro-rotations that cause lubricant migration and seizure.
Solution Approach 2:
The system dynamically transitions between two operational modes: rigid bearing-supported rotation for deployment and flexible elastic-supported rotation for fine pointing. The elastic connection's flexibility allows it to dynamically absorb small angular deviations without engaging the bearing, adapting the support mechanism to the current operational phase.
2Ease of operation
If seals are used to achieve rotational sealing, then rotational movements are enabled, but friction increases and lifespan decreases
Solution Approach 1:
The invention extracts the sealing function from the rotational bearing interface and relocates it to the elastic connection. The elastic arms provide both structural support and sealing through their flexible material properties, eliminating the need for separate rotational seals that would create friction and wear at the bearing interface.
Solution Approach 2:
The elastic connection acts as an intermediary element between the fixed support and the rotating platform. It mediates the rotational movement by providing flexible support and sealing through its material properties, preventing direct contact and friction between rotating and stationary components.
3Duration of action of moving object
If flexible components without contact are used, then lifespan is extended due to no lubrication needed, but angular displacement is limited
Solution Approach 1:
The system dynamically adapts the stiffness characteristics of the elastic connection based on operational phase. During deployment, the elastic arms are sufficiently flexible to allow large amplitude rotations. During fine pointing, the same elastic arms provide rigid enough support for precise positioning while maintaining their non-contact, lubrication-free advantage for extended lifespan.
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 extended operational cycles during fine pointing phases while minimizing wear and tear, ensuring compatibility with the harsh space environment and optimizing the lifespan of the device.
Implementation Method 1
the connection between the fixed part and the second race is an elastic connection in rotation around the axis of the bearing
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The device has a circular crown (1) attached to a fixed part (10) of a space equipment and a connection handle (6) actuating a pipe part (11) of the equipment. The handle is connected to a ring of a ball or roller bearing. The crown is connected to a ring (3) of the bearing in an elastic manner in rotation around an axis of the bearing. A stop (5) is attached in a rigid manner to the former ring such that relative rotation of the rings of the bearing is angularly limited. Angular positioning of the stop on the former ring is adjustable.