Roller Bearing Assembly With Force Pins for Accurate Load Sensing
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Solution Overview
Problem
Existing roller bearing load measurement technologies are not reliable for determining loads in wind turbines due to location-dependent influences and the maximum pressure distribution not aligning with the line of action of the contact angle, making it difficult to accurately measure loads in series systems.
Innovation Solution
A roller bearing assembly with coaxial inner and outer rings, featuring recesses for force measuring pins whose longitudinal axis extends along the axis of rotation and into regions subjected to maximum loads, allowing for accurate load detection independent of the pressure angle's line of action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the force measuring pin is arranged along the line of action of the pressure angle, then the measurement approach is simple, but the measurement is unreliable because the maximum pressure distribution is often not located in the center of the raceway
Solution Approach 1:
The force measuring pin is positioned to measure at the location of maximum load rather than at a fixed geometric position. The recess is strategically located where the maximum pressure distribution occurs, which may vary depending on operating conditions. This local optimization ensures accurate measurement at the critical measurement point.
Solution Approach 2:
The measurement system accounts for the dynamic nature of load distribution in roller bearings. Instead of assuming a fixed pressure distribution, the recess and force measuring pin are arranged to capture the maximum load area that occurs during operation, adapting to varying operating conditions.
2Device complexity
If load measurements are performed only on prototype systems, then the measurement system is simple, but the load history of production systems remains unknown due to site-specific influences
Solution Approach 1:
The force measuring pin arrangement is designed to be universally applicable to production systems rather than being limited to prototype systems. The simple yet effective measurement principle can be implemented in various wind turbine applications, allowing load history to be recorded across different sites and operating conditions.
Solution Approach 2:
The roller bearing arrangement itself performs the measurement function through the integrated force measuring pin. The bearing structure includes the recess and measurement element, enabling self-measurement of loads without requiring external complex measurement systems.
3Measurement precision
If the force measuring pin extends along the axis of rotation into the loaded area, then accurate load detection is achieved, but the structural complexity of the bearing increases
Solution Approach 1:
The bearing structure is segmented to include a specific recess for the force measuring pin. This segmentation allows the measurement function to be integrated into the bearing without requiring a complete redesign of the entire bearing structure. The recess is a localized modification that adds minimal complexity.
Solution Approach 2:
The force measuring pin is merged with the bearing structure by integrating it into the ring through a recess. This combination creates a unified measurement system where the pin becomes part of the bearing assembly, reducing the need for separate external measurement devices and minimizing overall structural complexity.
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 reliable and accurate measurement of loads acting on roller bearings, capable of withstanding high radial and axial loads, with multiple force measuring bolts providing precise data and minimizing measurement errors.
Implementation Method 1
at least one force measuring pin which is received in the recess, wherein the force measuring pin arranged in the recess extends with its longitudinal axis at least partially along the axis of rotation of the roller bearing
Data Source
Figure 1~2
AI summary
The invention relates to a roller bearing assembly (10) for determining loads (B) on a roller bearing (12), comprising: - a roller bearing (12), which has two coaxial rings (14, 16), specifically an inner ring (14) and an outer ring (15), and an axis of rotation (D), a plurality of rollers (15) each having a rotation axis (R) being arranged between the inner ring (14) and the outer ring (16), and at least one of the rings (14, 16) having at least one recess (18) for receiving a force-measuring pin (20); - at least one force-measuring pin (20), which is received in the recess (18), the longitudinal axis (L) of the force-measuring pin (20) arranged in the recess (18) extending at least partly along the axis of rotation (D) of the roller bearing (12), the at least one recess (18) and the at least one force-measuring pin (20) extending along the longitudinal axis (L) into a region, which is under a load (B), of the ring (14, 16) that has the at least one recess (18) in such a way that at least one vertical projection plane (P) perpendicular to the rotation axis (R) of the rollers (15) extends along the force-measuring pin (20) and a region of maximum load (B). This allows loads (B) that occur to be reliably measured.