Tire Pressure Monitoring Unit Hot Stamping Bond
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Solution Overview
Problem
Tire pressure monitoring units (TPMUs) face issues with high mass due to being filled with hardening casting compounds, leading to increased centrifugal forces at high speeds, which can cause detachment from the rim and damage, while existing solutions fail to adequately protect electronic components from moisture without adding weight.
Innovation Solution
The electronic components are materially bonded to the housing using a hot stamping connection, eliminating the need for casting compounds and ensuring a fluid-tight seal, with additional protection from foam inserts and secure fastening methods like hot embossing and welding, shifting the center of gravity to reduce detachment risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is filled with hardening potting compound to protect electronic components from moisture, then protection against moisture is improved, but the mass of the tire pressure monitoring unit increases significantly
Solution Approach 1:
The invention extracts and removes the potting compound from the housing design. Instead of filling the entire housing with potting compound, the electronic components are mounted on a circuit board that is secured to the housing using only a small amount of potting compound at specific mounting locations. This extraction eliminates the excess mass while maintaining moisture protection where it is actually needed - at the component-housing interface.
Solution Approach 2:
The invention applies local quality by providing moisture protection only where it is critically needed - at the mounting points of electronic components to the housing - rather than uniformly throughout the entire housing. The circuit board assembly is secured with minimal potting compound at specific locations, creating localized protection zones that suffice for reliability while minimizing overall mass.
2Reliability
If the tire pressure monitoring unit has large mass due to potting compound, then protection against moisture is improved, but centrifugal forces at high vehicle speeds increase rapidly
Solution Approach 1:
The invention extracts and removes the excessive potting compound that was previously used to fill the housing. By eliminating this unnecessary material, the mass of the TPMS unit is significantly reduced, which directly reduces the centrifugal forces acting on it during high-speed vehicle operation, thereby preventing detachment from the rim.
Solution Approach 2:
The invention applies local quality by providing structural support and moisture protection only at the specific mounting locations of electronic components, rather than uniformly throughout the housing. This localized approach minimizes mass while maintaining sufficient protection against moisture and centrifugal forces at the critical interface between components and housing.
3Reliability
If the electronic components are completely enclosed by potting compound, then protection against moisture is improved, but the complexity of the manufacturing process increases
Solution Approach 1:
The invention extracts and removes the complex process of completely encasing electronic components in potting compound. Instead, components are mounted on a circuit board and secured to the housing with minimal potting compound at specific mounting points. This simplifies the manufacturing process by eliminating the need for complete encapsulation while maintaining adequate protection.
Solution Approach 2:
The invention segments the housing into distinct functional areas: a circuit board assembly containing electronic components, and a housing structure with specific mounting points. This segmentation allows for modular assembly where the circuit board can be pre-assembled and tested separately, then mounted to the housing with minimal potting compound, simplifying the overall manufacturing process.
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 centrifugal forces and protects electronic components from moisture and vibrations, ensuring reliable operation and reduced risk of detachment, even at high speeds, without the need for additional fasteners or heavy sealing compounds.
Implementation Method 1
a seal (4) which is arranged between the air inlet (11) and the pressure sensor (12)... creates a reliable seal between the housing interior and the air inlet, and thus against the environment
Implementation Method 2
enabling the electronic components, in particular the printed circuit board, to be joined to one another by means of a material bond, in particular by means of a hot stamping process
Implementation Method 3
additional protection from foam inserts and secure fastening methods like hot embossing and welding
Implementation Method 4
the TPMS has a large mass. This results in significant centrifugal forces at high vehicle speeds
Data Source
Figure 1a
Figure 1b~1d
Figure 1e~1f
AI summary
The invention relates to a tire pressure monitoring unit (1) for arranging inside a motor-vehicle tire in order to sense the tire filling pressure, comprising: a housing, in which electronic components (8, 9), in particular a circuit board, and at least one pressure sensor (12) are arranged, wherein the housing comprises a lower housing shell (3) and an upper housing shell (7), wherein the lower housing shell (3) or the upper housing shell (7) has at least one protrusion (14); an air inlet (11), which is arranged in the housing and by means of which the tire filling pressure can be applied to the pressure sensor (12); a seal (4), which is arranged between the air inlet (11) and the pressure sensor (12), wherein the electronic components (8, 9), in particular the circuit board, can be joined together with at least one protrusion (14) of the lower housing shell (3) or of the upper housing shell (7) integrally, in particular by means of a hot-embossing joint.