Cap Attachment Structure with Segmented Elastic Portions for Thermal Creep
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Solution Overview
Problem
The existing cap attachment structures for vehicle wheels face issues with detachment due to thermal creep caused by heat transfer from the brake operation, leading to a reduction in the load securing capability of the cap.
Innovation Solution
A cap attachment structure featuring a first elastic deformation portion that engages the wheel during attachment and a second elastic deformation portion that engages only during detachment, with the latter being designed to avoid deformation under thermal stress, and optionally including a reinforcement portion and sliding mechanism to maintain load security even at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the latch piece is elastically deformed to engage the tire wheel, then the cap can be retained on the wheel, but the bending stress causes thermal creep deformation that reduces detachment load
Solution Approach 1:
The elastic deformation function is segmented into two separate portions: the first elastic deformation portion engages the wheel during normal operation, while the second elastic deformation portion remains inactive during attachment and only engages during detachment. This segmentation prevents thermal creep from affecting the detachment mechanism, preserving the detachment load despite heat exposure.
2Temperature
If heat is transferred from the brake to the cap through the wheel, then the cap experiences thermal expansion, but this causes the latch piece to deform and reduce securing capability
Solution Approach 1:
The second elastic deformation portion is extracted as a separate functional element that is spatially and functionally isolated from the thermal stress path. During heat exposure, this portion remains undeformed and inactive, while only engaging with the wheel during the detachment process. This extraction ensures that thermal expansion does not compromise the detachment load.
3Device complexity
If the cap is designed with a single elastic deformation portion for engagement, then the structure is simple, but the detachment load is compromised under thermal conditions
Solution Approach 1:
The second elastic deformation portion is designed with dynamic functionality: it remains inactive during normal attachment and thermal exposure, then becomes active only during detachment. This dynamic behavior allows the structure to adapt to thermal conditions while maintaining detachment capability, effectively using the same structural element for different functional states without compromising strength.
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 secures the detachment load of the cap from the wheel by preventing deformation of the second elastic deformation portion due to thermal creep, ensuring reliable attachment and detachment performance even when exposed to high temperatures.
Implementation Method 1
a first elastic deformation portion that is provided at the cap, the first elastic deformation portion being elastically deformed and engaging with the wheel while the cap is attached to the wheel
Implementation Method 2
a second elastic deformation portion that is provided at the cap, the second elastic deformation portion not being elastically deformed while the cap is attached to the wheel, and the second elastic deformation portion being elastically deformed by engaging with the wheel when the cap is detached from the wheel
Implementation Method 3
when a temperature at the cap is raised to an assumed maximum temperature and the cap expands while the cap is attached to the wheel
Data Source
AI summary
There is provided a cap attachment structure, including: a cap that is attached to a wheel of a vehicle; a first elastic deformation portion that is provided at the cap, the first elastic deformation portion being elastically deformed and engaging with the wheel while the cap is attached to the wheel; and a second elastic deformation portion that is provided at the cap, the second elastic deformation portion not being elastically deformed while the cap is attached to the wheel, and the second elastic deformation portion being elastically deformed by engaging with the wheel when the cap is detached from the wheel.