Adjusting Screw With Pivotal Locking Body for Vibration Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing control lever devices for motorcycles, particularly those with strong vibrations, face issues with unreliable adjustment screw locking due to loosening from vibrations and the need for a tool to adjust the lever position, leading to either restricted or ineffective locking.
Innovation Solution
An adjusting screw with a screw body and a pivotally connected locking body featuring an annular elastic plate that snap-engages with the screw body, providing constant engagement and resistance to rotation and displacement, ensuring secure locking independent of the screw's position within the threaded hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ring nut is used to lock the adjusting screw, then the screw resistance against loosening is increased, but the locking becomes unreliable under strong vibrations and requires a tool for adjustment
Solution Approach 1:
The locking body is designed to automatically lock the adjusting screw at any position without requiring external tools. The elastic plate with locking protrusions engages with corresponding features on the screw body, creating a self-locking mechanism that maintains the adjusted position reliably under vibration while allowing tool-free adjustment.
2Reliability
If an elastic plate is used for locking the adjusting screw, then the locking becomes less sensitive to vibrations, but the adjusting stroke is restricted or locking becomes ineffective when the screw head is not sufficiently close to the lever
Solution Approach 1:
The locking mechanism transitions from a static elastic plate requiring high preload to a dynamic system where the locking body can pivot and the elastic plate engages at any position along the screw's travel. The locking protrusions on the elastic plate engage with corresponding features on the locking body, maintaining reliable locking throughout the entire adjusting stroke range without restricting movement.
3Reliability
If friction is increased to prevent screw loosening, then the resistance against loosening is improved, but the complexity of the locking device increases
Solution Approach 1:
The locking body acts as an intermediary between the adjusting screw and the lever support structure. It features a pivot connection to the screw body and engages with a seat in the lever support structure, providing a simple yet effective locking mechanism that prevents loosening without requiring complex multi-component assemblies.
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 provides a reliable and tool-free adjustment mechanism that remains resistant to motorcycle vibrations, ensuring the lever's rest position can be accurately set without loosening, enhancing both assembly and maintenance efficiency.
Implementation Method 1
an annular elastic plate that snap-engages with the screw body, providing constant engagement and resistance to rotation and displacement
Data Source
AI summary
An adjusting screw (15) for a control lever device (1) for vehicles, wherein said adjusting screw (15) comprises a screw body (18) with a threaded shank (19) that can be screwed in a corresponding threaded hole (16) of the lever device (1) and a locking body (26) pivotally connected to the screw body (18). The locking body (26) comprises contact means (27) interacting with the screw body (28, 18) such as to counteract the rotation of the locking body (26) relative to the screw body (18) to a certain extent and anchoring means (29) engaging an anchoring seat (17) of the lever device (1) such as to prevent that the locking body (26) may rotate relative to the threaded hole (16) of the lever device (1).There are also provided means (25) for preventing that the locking body (26) may be displaced along the shank (19) of the screw body (18).