Split Rear Cover for Axlebox Sensor Assembly
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Solution Overview
Problem
The assembly and maintenance of sensor modules within axlebox-bearing units for railway axles are difficult due to limited access and visibility when the units are positioned on the inboard side of the vehicle, making it challenging to efficiently install and remove the sensor modules.
Innovation Solution
A sensorized axlebox-bearing unit with a split rear cover design, featuring two independent half rings that couple with the axle's cylindrical surface, allowing for easy assembly and disassembly of the sensor module, which is pre-assembled and tested within a toroidal sector portion of the cover, facilitating quick integration and monitoring of the axle's parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the axlebox-bearing unit is positioned on the inboard side of the vehicle, then the axlebox-bearing unit is securely supported, but the assembly and maintenance of sensor modules becomes difficult due to limited access and visibility
Solution Approach 1:
The rear cover is divided into two independent semi-circular ring portions that can be separately removed, providing access to the sensor module from the inboard side while maintaining the secure enclosed structure when assembled
2Reliability
If the sensor module is integrated within the axlebox-bearing unit, then monitoring capability is improved, but the complexity of assembly and disassembly increases
Solution Approach 1:
The sensor module is positioned in a dedicated sector of the rear cover that can be accessed by removing only the necessary semi-circular ring portions, allowing selective access without disassembling the entire bearing unit
Solution Approach 2:
The sensor module is pre-assembled and tested within the toroidal sector portion of the cover before integration into the axlebox-bearing unit, simplifying the final installation process
3Strength
If the rear cover is designed as a single piece, then structural integrity is maintained, but access to the sensor module is limited
Solution Approach 1:
The rear cover is segmented into two independent semi-circular ring portions that can be separately removed to provide access to the sensor module, while maintaining structural integrity when assembled together
Solution Approach 2:
The two semi-circular ring portions nest together to form the complete rear cover, providing both access capability and structural integrity
Data Source
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AI summary
Axlebox-bearing unit (1) for a railway axle (2), including a stationary axlebox (3); a rolling bearing (4) for supporting the axle; and a sensor unit (10) including a sensor module (11) and a connection plug (13); wherein a rear cover (17) of the axlebox-bearing unit is made in the shape of two independent ring stretches (20,21) adapted to couple in use with the axle (2); a first ring stretch (20) is defined by a semicircular profile flange (25) and a second ring stretch (21) is defined by a semicircular profile box (27) which is hollow inside and has towards the axle a circumferential opening (33); wherein the sensor module (11) is pre-assembled within the box (27) carried radially on the inside by a radially outer cylindrical lateral wall (28) of the box (27) and the connection plug (13) is integrally carried, radially on the outside, by the box (27) and is connected to the sensor module (11) by means of an electric cable (34) arranged within the box (27).