Wheel Bearing Cap Structure for Sensor Mud and Moisture Discharge
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Solution Overview
Problem
Conventional bearing caps for vehicle wheels with rotational speed detection devices face difficulties in efficiently discharging foreign matter, such as moisture or mud, which can accumulate and cause damage to the rotational speed sensor.
Innovation Solution
A bearing cap with a sensor support part featuring a recess and protrusions that form gaps between first and second wall sections, allowing for efficient discharge of foreign matter while maintaining rigidity through strategically placed protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor support part is made with a closed bottom shape to reduce foreign matter entry, then sealing properties are improved, but foreign matter that enters cannot be discharged efficiently
Solution Approach 1:
The sensor support part is segmented into multiple wall sections (first wall section and second wall section) that are disposed facing each other, creating gaps between them. This segmentation allows the structure to maintain overall sealing while providing discharge paths through the gaps, resolving the contradiction between sealed enclosure and foreign matter discharge capability.
Solution Approach 2:
The bottom surface is designed with non-uniform structure - most areas remain closed for sealing, but specific localized gaps are created between wall sections to enable foreign matter discharge. This local modification allows the structure to have different properties in different regions, maintaining sealing where needed while enabling discharge where required.
2Ease of operation
If the sensor support part has openings to discharge foreign matter, then foreign matter discharge is improved, but rigidity of the sensor support part deteriorates
Solution Approach 1:
The wall sections are designed as thin-walled structures that maintain sufficient rigidity through their geometry and material properties while creating gaps for foreign matter discharge. The thin-walled design allows the structure to be rigid enough for support functionality while enabling discharge capability through the gaps between sections.
Solution Approach 2:
By segmenting the sensor support part into multiple wall sections with gaps between them, the structure achieves both discharge capability and rigidity. The segmented design allows each wall section to maintain structural integrity while the collective arrangement provides discharge paths, resolving the contradiction between openings for discharge and overall rigidity.
3Reliability
If foreign matter accumulates on the bottom of the sensor support part, then sealing is maintained, but damage to the rotational speed sensor occurs due to freezing
Solution Approach 1:
The design converts the harmful accumulation of foreign matter into a beneficial discharge mechanism. By creating gaps between wall sections, the accumulated foreign matter can be discharged through these gaps, particularly when subjected to centrifugal force during wheel rotation, thus preventing freezing damage while maintaining sealing integrity.
Solution Approach 2:
The sensor support part is designed to utilize dynamic conditions during vehicle operation - specifically centrifugal force generated by wheel rotation - to discharge foreign matter from the bottom area. This dynamic discharge mechanism prevents foreign matter accumulation and subsequent freezing damage while preserving the sealed environment.
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
The design effectively discharges foreign matter and ensures the rigidity of the sensor support part, preventing damage to the rotational speed sensor and maintaining the sealing integrity of the bearing device.
Implementation Method 1
a rotational speed sensor that is disposed so as to face the magnetic encoder and that detects variation in magnetic poles of the magnetic encoder caused by rotation of the vehicle wheel
Data Source
AI summary
In a bearing cap in which a sensor support part is formed on a bottom surface section of a cap body and in which an insertion hole for a rotational speed sensor is formed in the sensor support part, a recess that accommodates a tip portion of the rotational speed sensor is formed in the portion of the bottom surface section where the sensor support part is formed. The sensor support part includes a first wall section and a second wall section that are disposed, facing each other across a virtual line L passing through a center axis G1 of the bottom surface section and a center axis G2 of the insertion hole, and that are formed along the circumferential edge of the recess. Protrusions protruding from the bottom surface section are continuously provided on the outer circumferential surfaces of the first wall section and the second wall section.