Wheel-Speed Sensor Mounting Device Sealing
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Solution Overview
Problem
Conventional wheel-speed sensors and sensing metal rings are exposed to environmental impurities and liquids, which affect their sensitivity and accelerate aging.
Innovation Solution
A wheel-speed sensor mounting device comprising a reducer case, a mounting shell, a wheel-speed sensor, and a sealing member, where the sensor is housed within the shell and protected from external exposure, with a lead-out wire passing through a sealing member to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wheel-speed sensor is exposed to the external environment for direct detection, then the detection function is achieved, but the sensor is affected by environmental impurities and liquid which reduces reliability and accelerates aging
Solution Approach 1:
The device is divided into separate functional components: a mounting shell that houses the sensor, a sealing member that isolates the sensor from the environment, and a sensing metal ring that interfaces with the external environment. This segmentation allows the sensor to remain protected while still performing its detection function through the sensing metal ring.
Solution Approach 2:
The sensing metal ring acts as an intermediary between the protected wheel-speed sensor and the external environment. The sensor detects signals from the metal ring without direct exposure to environmental impurities and liquid, while the metal ring rotates with the wheel to provide accurate speed detection data.
2Measurement precision
If the wheel-speed sensor is mounted exposed near the brake disc, then the detection accuracy is maintained, but the sensor sensitivity is affected by environmental impurities and liquid
Solution Approach 1:
The detection system is segmented into a protected sensing portion (wheel-speed sensor inside the mounting shell) and an exposed reference portion (sensing metal ring on the brake disc). This allows the sensor to maintain detection accuracy through the metal ring while being protected from environmental factors that would reduce sensitivity.
Solution Approach 2:
The sensing metal ring serves as a mediator that transfers rotational information from the wheel to the protected sensor. The sensor detects the position and speed of the metal ring through magnetic or optical fields without physical contact, maintaining measurement precision while eliminating sensitivity degradation from environmental exposure.
3Duration of action of moving object
If the wheel-speed sensor is exposed to the external environment, then the detection function operates, but the sensor is damaged by environmental impurities and liquid which reduces service life
Solution Approach 1:
The mounting shell and sealing member provide beforehand protection against environmental impurities and liquid before they can reach and damage the wheel-speed sensor. This preventive sealing structure cushions the sensor from harmful factors, extending its service life without affecting its detection function.
Solution Approach 2:
The sensing metal ring acts as a mediator that allows the sensor to perform its detection function without direct exposure to the external environment. The sensor remains sealed inside the mounting shell, interacting with the metal ring through non-contact fields, which prevents environmental damage and extends service life.
Data Source
AI summary
A wheel-speed sensor mounting device may be provided. The wheel-speed sensor mounting device includes a reducer case having a first mounting hole, a mounting shell mounted within the first mounting hole and having a first end extending into the reducer case and a second end, a wheel-speed sensor mounted within the mounting shell and having a first end extending out of the first end of the mounting shell and opposing to a sensing metal ring mounted in the reducer case and a second end having a lead-out wire, and a sealing member for sealing the second end of the mounting shell. The lead-out wire passes through the sealing member and extends out of the reducer case.