Turn Signal Switch Axial Width Reduction via Offset Lever
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Solution Overview
Problem
Existing turn signal switch devices have a large axial width due to the limited positioning of the cancel cam member, restricting the assembly of other parts to the steering shaft.
Innovation Solution
The turn signal switch device features a cancel lever with a cancel protrusion engaging part that can move towards and away from the steering shaft, allowing for offset alignment, reducing the axial width by enabling more flexible assembly of other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cancel cam member is assembled to the steering shaft with the cancel protrusion aligned to the front end of the cancel lever, then the automatic return function is achieved, but the entire width of all parts attached to the steering column in the axial direction becomes large
Solution Approach 1:
The cancel protrusion engaging part is disposed at a position offset from the lever body of the cancel lever in the axial direction of the steering shaft. This axial offset allows the cancel cam member to be assembled at a different axial position on the steering shaft, thereby reducing the overall axial width of the assembly while maintaining the automatic return function through the engagement between the cancel protrusion and the offset engaging part.
2Adaptability or versatility
If the cancel protrusion engaging part is disposed at a position offset from the lever body of the cancel lever in the axial direction, then the degree of freedom in assembling another part to the steering shaft is assured, but the structure becomes more complex
Solution Approach 1:
The cancel protrusion engaging part is integrated into the cancel lever structure itself, forming a nested configuration where the engaging part is disposed at an offset position along the axial direction. This integration allows the cancel lever to engage the rotating cancel protrusion while maintaining a compact design, providing assembly flexibility without significantly increasing overall structural complexity.
Data Source
AI summary
A turn signal switch device has a manipulation lever and a cancel lever that can advance and retract to and from the rotation path of a cancel protrusion, which is shaped like a sector and rotates together with a shaft. A cancel protrusion engaging part that engages a cancel protrusion is formed at the front end of the cancel lever. The cancel protrusion engaging part is disposed at a position offset from the lever body of the cancel lever in the axial direction of the shaft.