Floating Bushing Assembly for High Anti-Unscrewing Torque
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Solution Overview
Problem
Existing bushing assemblies do not optimize the anti-unscrewing resistant torque while maintaining ease of mounting, as the resistant torque is limited by the contact surface dimensions, which depend on the pre-defined seat dimensions.
Innovation Solution
A bushing assembly with a circular surface and an angularly movable appendage element that engages with a cage element's opening, allowing for increased contact area and rotation limitation, maximizing anti-unscrewing torque and ease of mounting by adjusting the angular positions during screwing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flange of the bushing element is shaped to limit rotation during screwing, then the ease of operation is improved, but the anti-unscrewing resistant torque is reduced because the contact surface area is limited by the seat dimensions
Solution Approach 1:
The bushing element is designed to be movable relative to the cage element during the screwing operation. The appendage element moves from an initial position where it limits rotation to a final position where it no longer constrains the bushing element, allowing the contact surface to be maximized against the shoulder while maintaining rotation control during mounting
Solution Approach 2:
The invention introduces a new degree of freedom by allowing the bushing element to move axially and rotationally relative to the cage element. The appendage element transitions from engaging the opening to disengaging, creating a dynamic system that optimizes both rotation limitation and contact surface area in different operational phases
Data Source
AI summary
A bushing assembly comprises a bushing element having a first surface, which is adapted to come into contact with a shoulder, and a threaded hole, which defines and axis and is adapted to be engaged by a screw; and a cage element, which is fitted around the bushing element so that the bushing element is supported and is floating; the cage element is adapted to be fixed to the shoulder and is provided with at least one opening; the opening defines an end abutment of the cage element; the bushing element comprises at least one stop portion, which engages the opening with an angular clearance and is movable around the axis at least between a first angular position, in which the stop portion is spaced apart from the abutment, and a second angular position, in which the stop portion is in contact with the abutment so as to prevent the bushing element from rotating past the second angular position; the stop portion is defined by an appendage element, which is distinct from the surface and the surface is circular.