Intersecting Groove Fitting Structure for Tire-Mounted Sensor Base
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Solution Overview
Problem
Existing fitting structures between functional component accommodation cases and rubber bases for tire-mounted sensors require deep grooves to prevent vibration and rotation, leading to increased weight and potential uniformity issues with the tire.
Innovation Solution
A fitting structure featuring intersecting case-side convex/concave parts on the accommodation case and corresponding base-side convex/concave parts on the rubber base, with asymmetrical groove widths and depths, effectively dispersing forces and reducing vibration and rotation without increasing the rubber base's volume or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deep groove is provided in the rubber base to prevent vibration and rotation of the accommodation case, then the holding power and stability are improved, but the weight of the rubber base increases and tire uniformity deteriorates
Solution Approach 1:
The single deep groove is segmented into multiple shallow grooves (first groove, second groove, third groove) that extend in different directions. These grooves divide the rubber base into multiple convex parts, distributing the holding function across several lighter structures rather than one heavy deep groove, thereby maintaining stability while reducing overall weight
Solution Approach 2:
The groove configuration transitions from a single deep groove in one dimension to multiple grooves extending in mutually intersecting directions (first groove in tire width direction, second and third grooves in tire circumferential direction). This multi-dimensional arrangement increases the surface area for holding the accommodation case without requiring excessive depth, thus reducing weight while maintaining reliability
2Reliability
If a deep groove is provided in the rubber base to prevent vibration and rotation, then the stability is improved, but frictional heat generation increases
Solution Approach 1:
The single deep groove is divided into multiple shallow grooves that extend in mutually intersecting directions. This segmentation reduces the depth of each individual groove while maintaining the overall holding effectiveness, thereby reducing friction between the accommodation case and rubber base that would generate heat, while still providing sufficient stability through the multi-directional groove configuration
3Reliability
If the volume of the circular convex part is increased to secure the groove depth and convex part volume, then the holding power is improved, but the weight increases and tire uniformity deteriorates
Solution Approach 1:
The volume requirement is segmented by creating multiple grooves that extend in mutually intersecting directions rather than relying on a single deep groove. This allows the grooves to achieve sufficient holding power through their combined multi-directional configuration while maintaining a smaller overall convex part volume, thus reducing weight while preserving tire uniformity
Solution Approach 2:
Instead of increasing volume by deepening a single groove, the solution uses grooves extending in mutually intersecting directions (tire width direction and tire circumferential direction). This multi-dimensional groove arrangement maximizes the holding surface area and mechanical interlocking effectiveness without requiring excessive volume, thereby maintaining holding power while reducing weight and preserving tire uniformity
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
This configuration efficiently suppresses vibration, rotation, and frictional heat generation while maintaining the structural integrity and uniformity of the tire, enhancing the holding power of the rubber base without increasing its weight.
Implementation Method 1
distortion caused by impact force applied to the rubber base 55 when the tire passes through a protrusion or the like is mitigated by elastic deformation of the rubber base 55
Implementation Method 2
not only a groove depth of about one (1) mm to two (2) mm is required, but it is also necessary to secure the volume of two semicircular convex parts 56a and 56b partitioned by the partition concave part 57. For this reason, it is necessary to increase the volume of the circular convex part 56, however, if the volume of the circular convex part 56 is increased, the weight of the rubber base 55 is increased, and as a result, the uniformity of the tire when the functional component is mounted may be deteriorated
Data Source
Figure 1~2
Figure 3A~3C
Figure 4A~4B
AI summary
A fitting structure between a functional component accommodation case and a rubber base, the functional component accommodation case being configured to accommodate a functional component that detects a state of a tire, and the rubber base being configured to be attached to an inner surface of the tire so as to mount the functional component accommodation case. The fitting structure includes plural case-side convex/concave parts that are formed on a case bottom surface which is a surface on a tire inner surface side of the functional component accommodation case and that extend in mutually intersecting directions, and plural base-side convex/concave parts that are formed on a functional component accommodation case side of a base bottom part, which is an attachment part to be attached to the tire, of the rubber base and that fit with the case-side convex/concave parts.