Sheet Metal Encoder Ring for Railway Speed Sensors
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Solution Overview
Problem
The existing encoder impulse wheels for railway vehicles are costly to manufacture and maintain, and their adaptation to different sensor designs is complex, primarily due to their machining from solid metal pieces.
Innovation Solution
An axlebox design featuring a metallic ring made from sheet metal, with clearances arranged around its circumference, which is stamped, bent, and fixed onto a support ring to generate oscillating magnetic induction in a nearby sensor, allowing for simplified production and maintenance, and adaptable clearance patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the encoder impulse wheel is machined from solid metal pieces, then the manufacturing precision and reliability are improved, but the production cost and manufacturing complexity increase
Solution Approach 1:
The encoder impulse wheel is divided into multiple separate components: a metallic ring with clearances, a support ring, and fastening elements. The metallic ring is further segmented into a strip-like material that is bent and closed to form the loop structure. This segmentation allows each component to be manufactured separately using simpler, less expensive processes while maintaining overall reliability through precise assembly.
Solution Approach 2:
The invention changes the manufacturing parameters from solid metal machining to sheet metal forming processes. The metallic ring is created by bending and closing a strip-like sheet metal material, which is a more cost-effective process than machining from solid metal. The clearances are formed by removing material in a controlled manner during the forming process, achieving the required precision at lower cost.
2Strength
If the encoder impulse wheel is machined from solid metal pieces, then the structural strength is improved, but the manufacturing time and production complexity increase
Solution Approach 1:
The encoder wheel is segmented into a metallic ring structure that can be manufactured separately and assembled. The strip-like sheet metal material is bent and closed to form the ring, which can be produced more quickly than machining solid metal. The segmentation allows for parallel manufacturing of components, improving overall production efficiency while maintaining structural integrity through proper design of the ring and clearance geometry.
Solution Approach 2:
The strip-like sheet metal material is prepared in advance with the clearances formed before bending and closing into the ring shape. This preliminary preparation of the flat strip with clearances allows for more efficient manufacturing compared to machining the final three-dimensional shape, as the clearances can be created using simpler cutting or punching operations on the flat material before forming.
3Ease of manufacture
If the encoder impulse wheel is designed with fixed clearance patterns, then the manufacturing simplicity is improved, but the adaptability to different sensor designs decreases
Solution Approach 1:
The clearance pattern in the metallic ring is designed to be adjustable rather than fixed. The strip-like sheet metal material allows for modification of the clearance positions and spacing after the basic ring structure is formed. This dynamic capability enables the same basic encoder wheel design to be adapted to different sensor designs by repositioning or reconfiguring the clearances, maintaining manufacturing simplicity while providing versatility.
Solution Approach 2:
The metallic ring with adjustable clearances serves multiple functions: it maintains the structural integrity of the encoder wheel, provides the necessary clearances for magnetic sensor operation, and allows adaptation to different sensor designs. The support ring and fastening elements provide universal mounting capabilities that work with various sensor configurations, making the overall encoder device universally applicable while maintaining simple manufacturing processes.
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 production costs, simplifies maintenance, and allows for flexible adaptation to various sensor designs, enhancing the efficiency and reliability of rotary speed sensors in harsh railway environments.
Implementation Method 1
the metallic ring comprising a set of clearances in a ferromagnetic material, wherein the metallic ring is configured to generate an oscillating magnetic induction in a nearby magnetic sensor upon rotation of the metallic ring
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~4F
AI summary
Encoder device for use in a magnetic sensor arrangement, comprising: a metallic ring (26) with a set of clearances (32) in a ferromagnetic material, wherein said clearances (32) are arranged around a circumference of the metallic ring (26), wherein the metallic ring (26) is configured to generate an oscillating magnetic induction in a nearby magnetic sensor (24) upon rotation of the metallic ring (26), characterized in that the metallic ring (26) is made of at least one flat and strip-like sheet metal material, two ends of which are joined to form a loop.