Two-Component Tire Pressure Monitoring Unit Housing
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Solution Overview
Problem
Tire-pressure monitoring units have a high mass due to being completely cast with curing casting material, leading to excessive centrifugal forces at high speeds, which can cause detachment and damage, especially when mounted on a motor vehicle tire rim.
Innovation Solution
Designing the housing as a two-component plastic injection-molded part, where a harder first component forms the main shell and a softer second component creates a seal, supports, and compensates for tolerances, reducing the need for casting and minimizing mass while providing effective protection against moisture and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is completely cast with curing casting material to protect electronic components against moisture, then the protection against moisture is improved, but the mass of the tire-pressure monitoring unit increases significantly
Solution Approach 1:
The housing is divided into two components: a first component (lower housing shell) and a second component (seal). This segmentation allows the seal to be formed by a separate material optimized for sealing, while the housing structure uses a different material, eliminating the need to cast the entire housing with heavy curing material.
Solution Approach 2:
The housing uses composite construction with a first component made of one material and a second component made of another material. This allows combining the structural benefits of the first material with the sealing benefits of the second material, achieving moisture protection without the excessive mass of complete casting.
2Reliability
If the housing is completely cast with curing casting material, then the seal against moisture is improved, but the centrifugal forces at high driving speed increase
Solution Approach 1:
By segmenting the housing into structural and sealing functions, the design eliminates unnecessary mass while maintaining the seal. The reduced mass directly decreases centrifugal forces at high driving speeds, preventing detachment and damage.
Solution Approach 2:
The sealing function is extracted from the housing structure and implemented by a separate second component. This removes the need for heavy curing casting material, reducing overall mass and consequently the centrifugal forces acting on the unit during high-speed operation.
3Reliability
If the housing is completely cast with curing casting material, then the protection against moisture is improved, but the complexity of the manufacturing process increases
Solution Approach 1:
The two components are merged into a single integrated housing structure where the second component forms an integral seal with the first component. This integration simplifies the manufacturing process by reducing the number of separate assembly steps while maintaining effective moisture protection.
Solution Approach 2:
The composite construction allows each component to be manufactured using materials and processes optimized for their specific function, simplifying the overall manufacturing process compared to complete casting while achieving superior sealing performance.
Data Source
AI summary
The invention relates to a tire pressure monitoring unit for arranging within a motor vehicle tire for sensing the tire filling pressure, wherein the tire pressure monitoring unit has a housing, in which electronic parts and at least one pressure sensor are arranged, wherein the housing has an air inlet, by means of which the tire filling pressure is applied to the pressure sensor, wherein the housing is designed as a multi-component plastic injection-molded part, in particular a two-component plastic injection-molded part, wherein a first component forms a lower housing shell and an upper housing shell and wherein a second component forms a seal between the air inlet and the pressure sensor. The invention further relates to a method for producing a tire pressure monitoring unit.