Tire Valve Unit With Attaching Projection For Stress Reduction
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Solution Overview
Problem
The existing tire valve units suffer from deterioration due to centrifugal force when the center of gravity is farther from the mounting hole, leading to stress on the rubber body, which can cause deformation and failure.
Innovation Solution
A tire valve unit design where the sensor unit is secured to the tire valve with an attaching projection that moves towards the second axial end during elastic deformation, allowing the body and sensor unit to be closer, reducing stress and eliminating the need for a gap between them, thus maintaining the center of gravity closer to the mounting hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a gap is provided between the body and the sensor unit to allow elastic deformation, then the tire valve unit can be mounted on the wheel, but the center of gravity moves away from the mounting hole causing increased stress on the body
Solution Approach 1:
An attaching projection is introduced as an intermediary component between the body and the sensor unit. This projection extends from the body into the sensor unit's housing and is retained by a fixture, enabling the body and sensor unit to be in close contact while still allowing the body to elastically deform during mounting. The attaching projection acts as a mediator that transmits deformation without requiring a gap.
Solution Approach 2:
The attaching projection is designed to be movable relative to the body during the mounting process. As the body elastically deforms when press-fitted into the wheel, the attaching projection moves accordingly within the sensor unit's housing. This dynamic adjustment allows the system to accommodate deformation while maintaining close contact, eliminating the need for a static gap.
2Stress or pressure
If the body and sensor unit are in close contact, then the center of gravity is closer to the mounting hole reducing stress, but the elastic deformation of the body is prevented making mounting difficult
Solution Approach 1:
The attaching projection provides a dynamic connection that allows the body to elastically deform during mounting while maintaining close contact with the sensor unit. The projection can move relative to the sensor unit's housing, enabling the body to stretch axially without creating a gap, thus resolving the contradiction between close contact and deformation capability.
3Ease of operation
If the center of gravity is farther from the mounting hole, then mounting is easier with more space for deformation, but centrifugal force causes greater stress and deterioration
Solution Approach 1:
The attaching projection serves as an intermediary that enables close contact between the body and sensor unit while accommodating elastic deformation. This allows the center of gravity to be positioned closer to the mounting hole, improving reliability by reducing centrifugal stress, while still allowing mounting to proceed without difficulty.
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 design reduces stress on the rubber body due to centrifugal force, thereby retarding deterioration and facilitating easier mounting by allowing the body and sensor unit to be in close contact, enhancing the structural integrity and durability of the tire valve unit.
Implementation Method 1
the body 112 is elastically deformed in a stretching manner in the axial direction of the tire valve 110
Implementation Method 2
an attaching projection that projects in the axial direction of the tire valve from the inside of the attaching portion toward the outside of the attaching portion
Implementation Method 3
a fixture that secures the attaching projection to the housing
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A tire valve unit includes a tire valve and a sensor unit. The tire valve includes a valve stem, a rubber body located on the periphery of the valve stem, and first and second axial ends. The sensor unit includes a sensor mounted on a wheel and a housing that accommodates the sensor and is secured to the tire valve. The tire valve unit is mounted on the wheel by press-fitting the tire valve into a mounting hole in the wheel from the first axial end. The body includes an opposed portion that is opposed to an inner surface of the mounting hole with the tire valve unit mounted on the wheel, a proximal end portion located closer to the second axial end of the tire valve than the opposed portion, and an attaching portion including the opposed portion and the proximal end portion. The tire valve includes an attaching projection that projects in the axial direction of the tire valve from the inside of the attaching portion toward the outside. The tire valve unit further includes a fixture that secures the attaching projection to the housing.