Pivot Connection Polygonal Boss Vibration Loosening
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Solution Overview
Problem
Existing pivot connections, such as those described in U.S. Pat. No. 6,264,013, are prone to loosening due to vibration, which reduces the pressure applied to the brake core, leading to diminished engagement with the brake surface.
Innovation Solution
A pivot connection with a motion dampener design featuring a polygonal boss and receiver, along with a pressure member that applies clamping pressure via a rotatable fastener, ensures engagement between the polygonal components to prevent relative rotation, even if pressure is diminished.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded mechanical connection applies pressure to force a tapered brake core into engagement with the brake surface, then the effectiveness of the pivot connection is improved, but vibration can result in loosening of the mechanical connection which diminishes the pressure applied
Solution Approach 1:
The patent employs asymmetric polygonal bosses (triangular, rectangular, or pentagonal shapes) on the pivot connection components. These polygonal features create non-circular engagement surfaces that prevent relative rotation between parts while maintaining stable engagement. The asymmetric geometry ensures that vibration cannot cause loosening because the polygonal shapes lock together in specific orientations, eliminating the rotational freedom that would allow threaded connections to loosen under vibrational loads.
2Stability of the object's composition
If a rotatable fastener applies clamping pressure to maintain polygonal boss engagement, then the polygonal components remain engaged to prevent relative rotation, but the pressure may be diminished over time due to vibration
Solution Approach 1:
The patent incorporates preliminary anti-action by designing the polygonal boss engagement to inherently resist loosening forces before they can affect the clamping pressure. The polygonal shapes create mechanical interlocking that prevents relative rotation and positions the components in a way that maintains clamping pressure. This preliminary geometric constraint acts against the tendency of vibration to loosen the connection, reducing the rate of pressure diminishment over time.
Data Source
AI summary
A pivot connection with a locking member which includes a first body with a link with a pivot pin passage. A second body has a pair of arms with pivot pint apertures and the second body straddles the link on the first body. A polygonal boss is formed on one of the arms of the second body surrounding the pivot pin aperture. A third body is provided with a polygonal boss receiver, a pivot pin aperture and a shoulder that engages the first body to prevent relative rotation of the first and third bodies. A pivot pin extends through the pivot pin aperture of the third body, the aligned pivot pin apertures of the second body and the pivot pin passage of the first body. A pressure member engages the pivot pin to apply pressure upon the third body to maintain the polygonal boss in engagement with the boss receiver.