Rotatable Flange With One-Piece Bearings for Water Monitor
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Solution Overview
Problem
Current water monitors face issues with rapid wear of ball bearing races due to material hardness differences, limited sweep range, and a fragile rotary-to-oscillatory conversion mechanism, leading to reduced reliability and increased labor in assembly.
Innovation Solution
A rotatable flange with one-piece bearings made of durable low-friction materials and a rotary-to-oscillatory motion converter using linkages and a rocker arm to achieve a wider angle of oscillation and resist bending loads, replacing traditional ball bearings and enhancing mechanical robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ball bearings are used in the rotatable flange, then rotational friction is reduced and radial/axial loads are supported, but the races wear rapidly due to hardness differences between steel balls and brass races
Solution Approach 1:
The patent applies homogeneity by making the bearing material (Delrin/acetal resin) the same for both the ball bearing and the race, eliminating the hardness mismatch between steel balls and brass races. This uniform material composition prevents the rapid wear that occurs when hard balls contact softer races, thereby extending race life while maintaining bearing functionality.
Solution Approach 2:
The patent employs composite materials by creating a bearing assembly where the ball bearing and race are made from the same composite resin material (Delrin). This composite approach allows the bearing to function as an integrated unit with matched material properties, resolving the wear issue caused by dissimilar materials while maintaining the mechanical benefits of ball bearings.
2Reliability
If ball bearings are installed in the rotatable flange, then rotational friction is reduced, but the assembly process becomes complex requiring fill ports and closures
Solution Approach 1:
The patent merges the ball bearing and race into a single integrated bearing assembly made from one piece of Delrin material. This consolidation eliminates the need for separate fill ports and closures that would be required to install individual ball bearings, simplifying the overall device structure while maintaining the friction-reduction benefits of ball bearings.
Solution Approach 2:
The bearing assembly is designed to be self-contained and self-installing. The integrated nature of the bearing and race allows the entire assembly to be installed as a single unit without requiring additional components like fill ports, making the installation process simpler and reducing the overall device complexity.
3Reliability
If ball bearings are used in the rotatable flange, then rotational friction is reduced, but labor time for ball installation increases
Solution Approach 1:
The patent combines the ball bearing and race into a single pre-fabricated assembly, eliminating the time-consuming process of individually installing multiple ball bearings. The merged bearing unit can be installed as one component, dramatically reducing assembly time while preserving the friction-reduction functionality of the ball bearing mechanism.
4Ease of operation
If traditional rotary-to-oscillatory conversion mechanism is used, then the monitor can convert rotary motion to oscillatory motion, but the mechanism is fragile and deforms under load limiting sweep range
Solution Approach 1:
The patent changes the material parameter of the rotary-to-oscillatory conversion mechanism from traditional fragile materials to a robust elastomeric material. This parameter change in material properties allows the mechanism to withstand bending loads and deformations that would cause failure in traditional designs, thereby maintaining strength while preserving the motion conversion capability and enabling a wider sweep range.
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 reduces wear and assembly time, increases the reliability of water monitors by providing a wider sweep range and a more robust conversion mechanism, improving performance and durability.
Implementation Method 1
A water-driven turbine has a water jet passage, a rotatable water wheel and a rotatable output shaft coupled to the water wheel, the water jet passage being in communication with the duct and receiving a drive portion of the flowing fluid, the drive portion being directed at the water wheel and causing the water wheel to rotate
Implementation Method 2
One or more one-piece bearings made of a durable low-friction material are disposed between a stationary portion and a rotatable portion of the rotatable flange, thus eliminating much of the wear and the costs associated with ball bearings
Data Source
AI summary
A rotatable apparatus for a water monitor. A flange assembly has a stationary portion, a rotatable portion disposed in the stationary portion, and a duct extending through the stationary and rotatable portions. A water-driven turbine has a rotatable water wheel in communication with the duct and an output shaft coupled to the water wheel. Fluid flowing through the duct causes the water wheel to rotate, the rotation of the water wheel causing the output shaft to rotate. An output crank, a first linkage, a rocker arm, and a second linkage comprising a first linkage member and a second linkage member are operable by the output shaft to convert the rotating motion of the output shaft to an oscillatory motion. Fluid exiting the duct is distributed by the rotatable portion in a determinable oscillatory pattern.