Split TPMS Inflation Valve Assembly for Rim Shielding and Theft
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Solution Overview
Problem
Commercial vehicle TPMS systems face challenges with signal attenuation due to metal rim shielding in built-in sensors and vulnerability to theft in external sensors.
Innovation Solution
A TPMS inflation valve design with a sensor subassembly integrated into the rim inflation valve structure, featuring a cavity for the sensor and an epitaxial antenna, and a threaded connection with a sealing ring to ensure strong signal transmission and secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the TPMS sensor is placed inside the tire (built-in type), then the sensor is integrated with the rim inflation valve, but the radio frequency signal is greatly weakened by the shielding effect of the metal rim
Solution Approach 1:
The invention divides the inflation valve into two separate components: the inflation valve body (mounted on the rim) and the sensor subassembly (mounted on the valve stem). This segmentation places the sensor outside the metal rim structure, eliminating the shielding effect while maintaining integration benefits. The sensor subassembly includes the RF transmitter, battery, and antenna as separate mounted components rather than embedded components.
Solution Approach 2:
The valve stem acts as an intermediary carrier that holds the sensor subassembly outside the metal rim. The inflation valve body mounted on the rim serves as the connection interface, allowing the sensor to be positioned in a location free from metal shielding while maintaining functional integration with the tire inflation system.
2Object-affected harmful factors
If the TPMS sensor is placed outside the rim (external type), then the radio frequency signal is not shielded, but the sensor is easily lost or stolen due to loosening of connection during driving process
Solution Approach 1:
The invention merges the sensor subassembly with the inflation valve system by mounting the sensor on the valve stem and integrating the antenna with the valve body. This combination creates a unified assembly that is securely connected to the rim through the standardized valve mounting interface, preventing loosening or theft while maintaining signal transmission quality.
Solution Approach 2:
The inflation valve structure serves multiple functions: it acts as the mounting base for the sensor subassembly, provides the connection interface to the rim, and houses the antenna. This multi-functionality ensures secure mounting while maintaining signal transmission, as the valve system is designed to remain firmly connected during vehicle operation.
3Reliability
If the sensor is placed in the tire, then the sensor is integrated with the rim inflation valve, but high energy consumption is required to maintain strong RF output signal
Solution Approach 1:
The invention extracts the sensor subassembly from inside the tire metal structure and positions it on the valve stem outside the rim. This extraction eliminates the need for high energy consumption to overcome metal shielding, as the sensor operates in a location with minimal RF interference, allowing the use of smaller, more energy-efficient batteries.
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 enhances communication reliability and connection strength while preventing signal interference and theft, effectively addressing the limitations of existing TPMS systems.
Implementation Method 1
the sensor (signal acquisition and transmission unit) of the commercial vehicle TPMS system... the sensor is placed outside the rim... its radio frequency signal is greatly weakened by the shielding effect of the metal rim
Implementation Method 2
a threaded connection structure is arranged at the tail part of the inflation valve seat, a clamping groove is formed in the inflation valve seat to arrange a sealing gasket
Implementation Method 3
a threaded connection structure is arranged at the tail part of the inflation valve seat... the inflation valve is mounted on the rim in a compressed manner through cooperation of an upper groove wall of the clamping groove with a fastener and a washer connected with the threaded connection structure
Implementation Method 4
The sensor subassembly is compressed by a limiting spring above to maintain ventilation between a part above the sensor subassembly and the top wall of the cavity
Data Source
AI summary
A TPMS inflation valve for a commercial vehicle includes an inflation valve body, an inflation valve seat and a sensor subassembly. The inflation valve body and the inflation valve seat are components split apart from each other. The inflation valve is mounted on an automobile rim by means of the inflation valve seat, and the inflation valve body is provided with an installation portion for a valve core. The inflation valve body and the inflation valve seat are assembled and connected to form an airflow channel for communication. A cavity located outside the automobile rim and close to the automobile rim is formed at the position where the inflation valve body and the inflation valve seat are assembled and connected. The sensor subassembly is arranged in the cavity in communication with the airflow channel of the inflation valve or located on the airflow channel.