Motorcycle Wheel Hub Sensor Disk Direct Mounting
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Solution Overview
Problem
The precision and repeatability of rotational speed detection in motorcycle anti-blocking systems are compromised by tolerance chains in the mounting of sensors and disk brakes, affecting the frequency and accuracy of braking inhibition, particularly in wheels with wire spokes and requiring improved concentricity of the disk with respect to the axle.
Innovation Solution
A wheel design where the sensor disk is directly connected to the hub, eliminating intermediate tolerances and ensuring precise alignment, and the hub is manufactured using a lathe to maintain high precision in axis alignment, reducing interference with spoke mounting tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sensor disk is mounted on the disk brake which is fixed to the hub, then the assembly is complete, but the tolerance chain reduces measurement precision
Solution Approach 1:
The sensor disk is extracted from the disk brake assembly and mounted directly to the hub, eliminating the intermediate mounting step that introduces tolerance accumulation. This separation allows the sensor disk to be positioned with higher precision relative to the hub axis without being affected by disk brake mounting tolerances.
Solution Approach 2:
The mounting system is segmented into independent components: the sensor disk mounts directly to the hub, while the disk brake mounts separately to the hub. This segmentation breaks the tolerance chain that previously connected sensor disk position to disk brake position through the hub, allowing each component to be positioned independently with higher precision.
2Ease of manufacture
If wire spokes are mounted on the hub, then the wheel structure is complete, but tool interference occurs during mounting
Solution Approach 1:
The hub is designed with asymmetric features: the sensor disk is mounted on one side of the hub, while the wire spoke mounting area is on the opposite side or in a different radial plane. This asymmetric arrangement ensures that the spoke mounting tool can access the hub without interference from the sensor disk or its mounting hardware.
3Ease of manufacture
If conventional manufacturing methods are used for the hub, then production is simple, but concentricity tolerance of the disk with respect to the axle is poor
Solution Approach 1:
The hub is manufactured on a lathe with preliminary precision machining of the mounting surfaces for the sensor disk and the axle interface. This preliminary action ensures that the concentricity requirements are built into the hub itself during manufacturing, rather than relying on post-assembly alignment procedures.
Data Source
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AI summary
Wheel (3, 4) for a motorcycle (1), comprising: a hub (8) rotatable about an axis (D), and a transducer (35) configured to generate a signal associated to the rotational speed of hub (8) about an axis (D); said transducer (35) comprises a disk (20) rotatable about said axis (A); said disk (20) is directly connected to said hub (8).