Cancel Lever Noise Suppression via Leaf Spring Bias
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Solution Overview
Problem
Existing turn signal switch devices generate abnormal noise due to vibrations of the cancel lever during waiting or operation, caused by repeated contact and non-contact with the guide surface.
Innovation Solution
An input operation device with a cancel lever that includes a leaf spring portion elastically biased against a guide surface, ensuring continuous contact and preventing vibration-induced noise, utilizing a simple mechanism without additional components. The leaf spring portion is molded into the cancel lever and is guided by a cam face to maintain stability and suppress vibrations during both advance and retreat movements and rotations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cancel lever is provided without additional components to maintain simple mechanism, then device complexity is reduced, but the cancel lever vibrates and generates abnormal noise due to repeated contact and non-contact with the guide surface
Solution Approach 1:
The cancel lever is modified by changing its physical parameters - a protrusion is added to the tip and a groove is formed on the side surface. These geometric parameter changes enable the lever to interact with the guide surface in a way that maintains continuous contact during rotation, eliminating vibration and noise without requiring additional components or complex mechanisms
2Ease of operation
If the cancel lever is allowed to rotate freely during cancel operation, then the operating lever can be automatically returned to neutral position, but the cancel lever vibrates violently and generates abnormal noise
Solution Approach 1:
The guide surface acts as an intermediary between the cancel lever and the housing. By designing the guide surface with specific geometric features (protrusion and groove) that match the cancel lever's features, continuous contact is maintained during rotation, mediating the motion to prevent vibration and noise while still enabling the automatic return function
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 effectively prevents abnormal noise by ensuring continuous contact between the cancel lever and the guide surface, maintaining the cancel lever in a stable state and reducing vibrations, all while maintaining a simple configuration without requiring new components.
Implementation Method 1
a leaf spring portion is integrally molded in the cancel lever, and the leaf spring portion is elastically biased so as to be pressed against a guide surface
Data Source
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AI summary
Provided is an input operation device which does not generate abnormal noise at the time of an operation of a cancel lever with a simple mechanism. An input operation device includes: an operating lever (1); a holder (3) which supports a base portion of the operating lever (1) so as to be rotatable on one plane; and a cancel lever (4) which is provided in the housing (2) so as to be movable according to the rotation of the holder (3) and can perform an advance and retreat movement with respect to a rotation locus of a cancel projection (6a) which rotates integrally along with a steering shaft, and a rotation, in which leaf spring portions (51d, 52d) elastically biased so as to be pressed against a guide surface (39) of a lower case (33) are integrally molded in the cancel lever (4) .