In-Tire Circuit Unit Bracket With Two-Step Retainer Locking
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Solution Overview
Problem
Conventional in-tire electric devices face difficulties in attaching the electric circuit unit to the bracket due to increased resilient force required, making it hard to secure the unit effectively.
Innovation Solution
The design incorporates a bracket with a retainer system and specific engagement protrusions and holes that allow for a two-step operation to attach and secure the electric circuit unit, utilizing a belt around the tire rim for stabilization, and a retainer to enhance holding force with reduced elastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the force with which the electric circuit unit is held by the bracket is increased, then the holding force is improved, but the resilient force of the engaging portion increases making it difficult to attach
Solution Approach 1:
The engagement mechanism is divided into two separate components: an engaging portion that provides initial attachment and a retainer that provides enhanced holding force. This segmentation allows the attachment process to occur in two stages - first engaging the circuit unit with low force, then securing it with the retainer for high holding force without requiring high resilient force during attachment.
Solution Approach 2:
The engaging portion performs the preliminary action of attaching the electric circuit unit to the bracket in a first direction with minimal resilient force. After this preliminary attachment is achieved, the retainer is then engaged to provide the enhanced holding force in a second direction, separating the attachment action from the force application action.
2Reliability
If the resilient force of the engaging portion is increased to increase holding force, then the holding force is improved, but the attachment process becomes difficult
Solution Approach 1:
The fixation system is segmented into two functional parts: the engaging portion for easy attachment and the retainer for reliable fixation. The engaging portion uses minimal resilient force for attachment, while the retainer provides the strong holding force needed for reliable fixation, thus achieving both ease of operation and fixation stability.
Solution Approach 2:
The retainer acts as an intermediary component that enhances the holding force after the initial engagement. It mediates between the weak initial engagement and the need for strong fixation, providing the additional holding force through a separate engagement mechanism that does not increase the resilient force of the primary engaging portion.
Data Source
AI summary
To provide an in-tire electric device in which an electric circuit unit can be easily attached to a bracket and a force with which the electric circuit unit is held by the bracket has been increased than before. An in-tire electric device 101 of the present disclosure includes a bracket 10A fixed to an outer peripheral surface 96A of a rim 96 by a belt 90, and an electric circuit unit 50A detachably held by the bracket 10A. Then, through a two-step operation in which the electric circuit unit 50A is moved in a first direction and then rotated in a second direction, a first engagement protrusion 51 and a second engagement protrusion 52 of the electric circuit unit 50A are engaged with a first engagement hole 21 and a second engagement hole 22 of the bracket 10A, and thus a retainer 70A is engaged with the bracket 10A so that the reverse of the second direction is restricted.