Wheel Speed Sensor Ring Mounting Structure Thermal Management
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Solution Overview
Problem
Conventional wheel speed sensor ring mounting structures face challenges in miniaturization due to thermal expansion of brake discs, which affects sensor accuracy and makes it difficult to suppress heat-related effects without increasing the size of the pulser ring.
Innovation Solution
A mounting structure that includes an intermediate ring with higher thermal conductivity, sandwiched between the wheel body and brake disc, supporting the pulser ring in a floating state to enhance heat transfer from the brake disc while minimizing heat transfer to the pulser ring, and using this ring to radiate heat effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pulser ring is fixed directly to the wheel body with the brake disc, then the structure is simple, but thermal expansion of the brake disc causes sensor accuracy degradation and prevents miniaturization
Solution Approach 1:
An intermediate ring is introduced between the brake disc and the pulser ring. This intermediate ring serves as a thermal buffer that absorbs and dissipates heat from the brake disc, preventing thermal expansion from reaching the pulser ring and thus maintaining sensor accuracy without requiring a complex compensation mechanism.
Solution Approach 2:
The mounting structure is divided into separate functional components: the brake disc assembly, the intermediate ring, and the pulser ring assembly. This segmentation allows each component to perform its specific function independently, with the intermediate ring specifically tasked with thermal management, thereby solving the thermal expansion problem without complicating the overall structure.
2Measurement precision
If the pulser ring is reinforced to maintain sensor accuracy, then measurement precision is improved, but the structure cannot be miniaturized
Solution Approach 1:
The intermediate ring acts as a thermal shield that blocks heat transfer from the brake disc to the pulser ring. This allows the pulser ring to maintain its original compact size without requiring reinforcement, as the thermal buffer protects it from thermal expansion that would otherwise compromise sensor accuracy.
3Temperature
If heat transfer from the brake disc is accelerated, then thermal effects are suppressed, but heat transfer to the pulser ring may increase
Solution Approach 1:
The intermediate ring serves as a controlled thermal pathway that accelerates heat dissipation from the brake disc while simultaneously acting as a thermal barrier. By positioning the pulser ring on the opposite side of the intermediate ring from the brake disc, the structure allows heat to flow away from the brake disc while blocking its path to the pulser ring.
Solution Approach 2:
The intermediate ring has different thermal conductivity properties on different sides: the side facing the brake disc allows heat absorption and dissipation, while the side facing the pulser ring provides thermal insulation. This local differentiation of thermal properties enables simultaneous heat management and protection of the pulser ring.
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 solution effectively suppresses thermal effects caused by brake disc heat generation on the pulser ring and wheel body, maintaining sensor accuracy without enlarging the pulser ring, and allows for relative deformation between the intermediate and pulser rings.
Implementation Method 1
the intermediate ring (74) includes a fastening portion (84) which is fastened by being sandwiched between a fastening portion (51) of the wheel body (17a) and a fastening portion (79) of the brake disc (52)
Implementation Method 2
the intermediate ring constitutes a heat sink for the brake disc, accelerating heat transfer from the brake disc
Implementation Method 3
allows for relative deformation between the intermediate and pulser rings
Data Source
AI summary
A mounting structure of a wheel speed sensor ring includes an intermediate ring made of aluminum which is fastened to a hub of a wheel body together with a brake disc in a state where the intermediate ring is brought into contact with the brake disc, and a pulser ring is supported on the intermediate ring in a floating state. A supported portion of the pulser ring is provided at a center position within the intermediate ring, and the intermediate ring includes a plurality of seat plate portions on an outer periphery thereof which are fastened between hub and the brake disc. The mounting structure has a compact size which permits various thermal effects caused by the generation of heat in a brake disc to be effectively suppressed.