Hub Cap Labyrinth Gap Fixation Bearing
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Solution Overview
Problem
Conventional pivot assembly bearing devices face challenges in accurately fixing the hub cap to the shaft to form a specified labyrinth gap, which is essential for preventing particle dispersion while avoiding interference with the inner ring, making it difficult to suppress particle dispersion effectively.
Innovation Solution
The bearing device incorporates a hub cap with an inner annular surface, an inclined annular surface, and an outer annular surface, where the inner annular surface contacts the inner ring, and an adhesive retaining portion is formed between the inclined surface and the outer edge, allowing for precise fixation and adhesive management to prevent adhesive entry into the rolling bearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the hub cap is press-fitted onto the shaft to fix it at a specified position, then the hub cap can be securely fixed to the shaft, but it becomes difficult to accurately form a labyrinth gap of a specific width between the hub cap and the inner ring
Solution Approach 1:
The end surface of the inner ring is divided into two functional zones: a first contact region that contacts the inner annular surface of the hub cap for positioning, and a second non-contact region that forms the labyrinth gap with the outer circumferential surface of the hub cap. This segmentation allows independent control of fixation and gap formation.
Solution Approach 2:
The inclined annular surface of the hub cap acts as an intermediary element between the inner ring and the outer circumferential surface of the hub cap. By controlling the inclination angle and extent of this surface, the labyrinth gap width can be precisely determined without relying on press-fitting position alone.
2Object-affected harmful factors
If the distance between the hub cap and the inner ring is enlarged to avoid interference, then interference between the hub cap and inner ring is prevented, but the labyrinth gap width becomes difficult to control at a specified value
Solution Approach 1:
Different regions of the hub cap's end surface are given different functions: the inner annular surface provides contact for positioning, the inclined annular surface creates the labyrinth gap, and the outer annular surface prevents adhesive overflow. This local differentiation allows simultaneous achievement of interference avoidance and precise gap control.
3Strength
If adhesive is used to fix the hub cap to the shaft, then fixation is achieved, but adhesive may overflow into the rolling bearing causing defective rotation
Solution Approach 1:
The inclined annular surface of the hub cap serves as a barrier that prevents adhesive overflow from reaching the rolling bearing. The specific inclination angle and extent of this surface create a protective zone that contains any adhesive within the hub cap structure.
Solution Approach 2:
The hub cap structure is designed in advance with the inclined annular surface positioned to preemptively block adhesive overflow paths before adhesive can reach the rolling bearing during the bonding process.
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 configuration enables the formation of a desired labyrinth gap, effectively suppressing particle dispersion and preventing adhesive issues that could lead to defective bearing rotation, thereby ensuring reliable operation.
Implementation Method 1
an adhesive retaining portion that is a predetermined annular space is formed between the area extending from the intermediate position to the outer peripheral edge of the inner ring and at least the inclined annular surface of the hub cap
Implementation Method 2
An adhesive retaining portion that is a predetermined annular space is formed between the area extending from the intermediate position to the outer peripheral edge of the inner ring and at least the inclined annular surface of the hub cap
Implementation Method 3
a small gap (labyrinth gap) is formed between the hub cap and the inner circumferential surface of the outer ring. Due to this labyrinth gap, the flow of air within the rolling bearing is suppressed to reduce scattering of grease
Data Source
AI summary
A bearing device includes an annular hub cap facing an inner ring. An inner annular surface of the hub cap abuts a part of one end surface of the inner ring which extends from an inner peripheral edge to an intermediate position located on the way from the inner peripheral edge to an outer peripheral edge. An annular adhesive retaining portion is formed between the area extending from the intermediate position to the outer peripheral edge of one end surface and at least an inclined annular surface of the hub cap.