Bicycle Rim Pressure Sensor Mounting Independent of the Valve
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Solution Overview
Problem
Current bicycle tire pressure monitoring systems are susceptible to mechanical stress, impact, and dirt due to their installation on the tire valve, requiring complex sealing and additional metallic reinforcements, making them unsuitable for initial factory equipment or holistic control systems.
Innovation Solution
A bicycle rim design with a second opening for mounting a pressure measuring device independently of the tire valve, allowing a structurally simpler and valve-independent tire pressure measurement system that can be easily integrated into factory equipment and electronic assistance systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure sensor is installed on the tire valve, then the tire pressure can be measured, but the system becomes susceptible to mechanical stress, impact, and dirt
Solution Approach 1:
The pressure sensor is extracted from the valve assembly and integrated directly into the rim structure. The sensor housing is formed as an integral part of the rim, positioning the sensing element within the rim's internal cavity where it can measure tire pressure without being exposed to external mechanical stress, impact, and dirt that affect valve-mounted sensors.
Solution Approach 2:
The pressure sensor system is merged with the rim structure itself. The sensor housing, mounting features, and sealing elements are combined into a single integrated rim component, eliminating the need for separate valve-mounted assemblies and their associated sealing complexities.
2Measurement precision
If the pressure sensor is installed on the tire valve, then the tire pressure can be measured, but complex sealing and metallic reinforcements are required
Solution Approach 1:
The sensor housing is merged with the rim structure, using the rim's own walls and cavity to provide the sensor mounting environment. This eliminates the need for separate sensor housings, mounting brackets, and reinforcement structures that would be required for valve-mounted installations.
Solution Approach 2:
The rim structure is designed with localized features specifically for sensor integration, such as an internal cavity or recessed area where the sensor can be positioned. The rim's inherent structural strength at this location provides natural support, eliminating the need for additional metallic reinforcements.
3Measurement precision
If the pressure sensor is installed on the tire valve, then the tire pressure can be measured, but the system is unsuitable for initial factory equipment or holistic control systems
Solution Approach 1:
The pressure sensor is integrated into the rim as a single assembly that can be manufactured and installed during the wheel assembly process. The sensor housing is formed as part of the rim structure, allowing simultaneous manufacturing of the rim and sensor mounting features, making it ideal for initial factory equipment installation.
Solution Approach 2:
The wheel assembly is segmented into functional modules: the rim with integrated sensor, the tire, and the valve assembly. This modular design allows the sensor-equipped rim to be manufactured separately and then assembled with the tire and valve as a complete wheel unit, facilitating factory equipment integration and future expansion to holistic control systems.
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
Enables a structurally simpler and more durable tire pressure measurement system that can be integrated into bicycle rims at the factory, reducing susceptibility to mechanical stress and dirt, and facilitating integration into electronic systems like ABS.
Implementation Method 1
The pressure sensor can be designed as an embedded, microelectromechanical sensor using silicon technology, preferably resistive, piezoresistive, or capacitive
Data Source
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AI summary
The invention relates to a bicycle rim (4) with an annular rim profile (9) for receiving a tire casing (8) on the outside, wherein the rim profile (9) together with the tire casing (8) forms an annular cavity (80) for providing an overpressure area (10), wherein the rim profile (9) has a first opening, preferably aligned radially to the rim profile (9), for receiving a valve (11) for filling the overpressure area (10) with a gas (G), and wherein a measuring device (12) with at least one pressure measuring sensor (13) for determining the pressure (p) in the overpressure area (10) is arranged on the rim profile (9). According to the invention, a second opening (14) is provided on the rim profile (9) for receiving the measuring device (12), spaced from the first opening, which allows the measuring device (12) to be arranged on the rim profile (9) independently of the valve (11).