Tire Valve Sensor Fixing via Elastic Ring and Locking Plate
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Solution Overview
Problem
Conventional tire state monitoring devices experience unstable fixing of the sensor unit due to rotation and loosening when the tire is mounted, as the nut is rotated with the sensor unit around the valve stem.
Innovation Solution
A tire state monitoring device is integrated with a tire valve, featuring a valve stem with a male screw part, a cylindrical nut, a sensor unit, a nut insertion hole, and an elastic ring member that elastically deforms to securely hold the sensor unit in place, preventing the nut from loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor unit is fixed to the valve stem by screwing a nut onto the valve stem, then the sensor unit can be mounted on the tire valve, but the nut rotates together with the sensor unit when the tire hits the sensor unit, causing loosening and unstable fixing
Solution Approach 1:
A locking plate is introduced as an intermediary component between the nut and the sensor unit. The locking plate has a through hole through which the valve stem passes, and the nut is secured to the locking plate rather than directly to the sensor unit. This intermediary structure prevents the nut from rotating with the sensor unit while maintaining secure fixing.
Solution Approach 2:
The fixing structure is segmented into multiple independent components: the sensor unit, the locking plate, and the nut. The locking plate is positioned separately from both the sensor unit and the nut, creating a modular assembly where each component has a specific function. This segmentation allows the nut to be locked to the locking plate while the sensor unit can be independently positioned.
2Device complexity
If the nut is directly attached to the sensor unit, then the structure is simple, but the sensor unit rotation causes the nut to loosen and the fixing becomes unstable
Solution Approach 1:
The locking plate serves as a mediator that adds minimal structural complexity while significantly improving reliability. It provides a stable mounting surface for the nut and prevents direct rotation between the nut and sensor unit, achieving reliable fixing with only one additional component.
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 device stabilizes the fixing of the sensor unit by utilizing the resilient force of the elastic ring members, preventing the nut from rotating and ensuring secure attachment to the tire valve, even under external forces, thus maintaining consistent monitoring performance.
Implementation Method 1
an elastic ring member fitted on an outer peripheral surface of the cylindrical nut and configured to elastically deform in a radial direction of the cylindrical nut
Data Source
AI summary
A tire state monitoring device that is able to stabilize fixing of a sensor unit is provided. A tire state monitoring device includes a tire valve mounted on a tire wheel, a cylindrical nut screwed onto the valve stem of the tire valve, and a sensor unit that detects a tire state and transmits a detection result to an external part. A nut insertion hole, into which the cylindrical nut is inserted, is formed in the sensor unit. An elastic ring member is fitted on the outer peripheral surface of the cylindrical nut and elastically deforms in the radial direction of the cylindrical nut while the cylindrical nut is kept inserted in the nut insertion hole. The sensor unit is held by the cylindrical nut by a resilient force of the elastic ring member.