Rotary Switch Shaft Stopper Rotation Limit
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Solution Overview
Problem
Conventional rotary operation type switches face issues with direct contact between rotating and stationary bodies leading to potential damage, and restricted rotation ranges due to transmission structures, which complicates design and increases costs.
Innovation Solution
A rotary operation type switch comprising a holder, rotary control, shaft, fixing portion, and stopper, where the shaft is inserted into the fixing portion and the stopper restricts the rotation range by contacting the outer wall part, distributing loads effectively without compromising aesthetics or strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rotation range is restricted by direct contact between the rotating body and stationary body, then the structure is simple, but the risk of damage increases due to direct contact
Solution Approach 1:
The patent introduces a transmission structure (shaft) as an intermediary between the rotary control body and the detector switch. This shaft is fixed to the rotary control body and transmits rotational force without direct contact between the control body and stationary components, thereby reducing damage risk while maintaining structural simplicity.
2Reliability
If the rotation range is restricted by having the transmission structure come into contact with the stationary body, then the structure is more reliable, but the press-fitting portion is subjected to repeated loads
Solution Approach 1:
The patent designs the shaft with a specific geometric feature (outer peripheral face perpendicular to rotational direction) that locally bears the restriction load, rather than the press-fitting portion. This local quality differentiation protects the press-fitting joint from repeated loads while maintaining reliable rotation restriction.
3Strength
If very stiff material or increased volume is used to strengthen the press-fitting portion, then the strength is sufficient, but the price and aesthetics are compromised
Solution Approach 1:
The patent extracts the load-bearing function from the press-fitting portion and relocates it to the shaft's outer peripheral face, which is specifically designed to contact the stopper. This extraction allows the press-fitting portion to maintain standard manufacturing specifications without requiring expensive stiff materials or increased volume.
4Ease of operation
If the transmission structure is used to transmit rotation, then the operating range can be restricted, but the structure becomes more complex
Solution Approach 1:
The patent segments the rotation restriction function into two independent parts: the shaft (transmission component) and the stopper (restriction component). This segmentation allows each component to be simple in design while collectively achieving reliable rotation range control, avoiding the need for complex integrated transmission structures.
Data Source
AI summary
A rotary operation type switch includes a holder, a rotary control, a shaft, a press-fitting portion, an outer wall part, and a stopper. The holder is provided in a state of immobility in the rotational direction. The rotary control rotates relatively with respect to the holder when a rotational force is imparted. The shaft transmits the rotational force imparted to the rotary control. The press-fitting portion is provided to The rotary control, and an end of the shaft is inserted into it. The outer wall part is provided along a direction perpendicular to the rotational direction of the rotary control. The stopper is provided to the holder, and comes into contact with the outer wall part and restricts the limit position of the rotation range when the rotary control and the shaft rotate relatively with respect to the holder.