Window Operator Flanged Bearing Alignment
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Solution Overview
Problem
High torque applied to window operators causes axial forces that lead to separation of gear teeth and reduced bearing contact, resulting in inefficient operation or complete failure due to stress and deformation.
Innovation Solution
The operator assembly includes a housing with a cover and base, a worm rotatably disposed in an angled tubular portion, and a flanged bearing with a shoulder that secures the sun gear, maintaining proper alignment and reducing stress through a secure assembly of the operator arm subassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high torque is applied to the input shaft, then the operator can open and close the window, but axial force pushes the gear against the cover and operator arm against the base, causing separation and component failure
Solution Approach 1:
A spring-loaded retainer acts as an intermediary component between the operator arm and the base. This retainer maintains constant contact pressure between the gear teeth and the operator arm, preventing separation under high torque conditions while allowing the high torque to be transmitted effectively for window operation.
Solution Approach 2:
The spring-loaded retainer provides beforehand cushioning by pre-applying contact pressure to maintain gear engagement. The spring is pre-compressed to exert a constant force that cushions against the separating tendency caused by axial force during high torque operation, preventing component failure before it occurs.
2Power
If high torque is applied to the input shaft, then the operator can open and close the window, but bearing contact is reduced, generating stresses that cause deformation failure
Solution Approach 1:
The spring-loaded retainer serves as a mediator that distributes and transfers the high torque loads more evenly between the operator arm and the base. By maintaining constant contact pressure, it prevents stress concentration on the bearing support surfaces, eliminating the deformation failure that would otherwise occur under high torque conditions.
3Force
If the gear and operator arm are allowed to separate, then the axial force can be accommodated, but the gear teeth slide away from position, reducing engagement and causing failure
Solution Approach 1:
The spring-loaded retainer acts as an intermediary that maintains precise alignment between the gear teeth and operator arm during axial force application. The spring pressure ensures continuous contact, preventing the gear teeth from sliding away from their manufactured positions while still accommodating the axial force generated during window operation.
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
This configuration maintains the alignment of moving components, reduces unwanted binding, and ensures efficient operation by preventing gear separation and bearing deformation, thus extending the lifespan of the window operator mechanism.
Implementation Method 1
A bearing is used to support and hold the sun gear in place
Implementation Method 2
The shoulder portion is then optionally flared outwardly to rotatably retain the sun gear pivotally adjacent to the at least one arm
Implementation Method 3
The positioning post may then be swaged to secure the bearing in place
Implementation Method 4
at least one fastener post may be swaged to retain the base to the cover
Implementation Method 5
The gear meshes with a worm gear on a shaft
Data Source
AI summary
An operator suitable for opening and closing casement windows includes a housing (e.g., a base and a cover), and an operator arm subassembly driven by a worm. The operator arm subassembly may include at least one operator arm pivotally disposed in the housing via a flanged bearing. The operator arm may define a gear. If a plurality of operator arms are present, a sun gear may be used. The flanged bearing properly aligns the components to reduce stresses encountered during use. The flanged bearing may have a base portion, a middle portion, and an upper portion in a stepped configuration. The base may engage the base of the housing. The upper portion of the bearing may engage a cover of the housing. A middle portion of the bearing pivotally joins the arm and/or sun gear. The instant flanged bearing provides a smoother, more efficient operation and increases the useful life of the operator.