Axle Hub Bearing Cover Structure for Off-Road Rigidity

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Solution Overview

Problem

Existing axle assemblies in vehicles, particularly off-road vehicles, lack sufficient rigidity to withstand shocks from rough terrain, leading to potential rattling and reduced structural integrity.

Innovation Solution

Incorporating a cover that attaches to the knuckle and pushes the hub bearing against a stopper from the outer side, enhancing the rigidity of the axle assembly by firmly uniting the hub bearing and knuckle, with a design that includes an annular shape and a labyrinth gap to prevent dispersal of pressing force and protect against corrosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the hub bearing is simply housed in the shaft hole without additional fastening structures, then the device complexity is reduced, but the rigidity of the axle assembly deteriorates

Engineering Contradiction:

Improvestructure complexityVSAvoidrigidity

Core Design Contradiction:

Device complexityVSStrength

Solution Approach 1:

The stopper is pre-installed inside the shaft hole at a predetermined position before the hub bearing is assembled. This preliminary action creates a pre-positioning structure that prevents the hub bearing from moving inward, establishing rigidity before final assembly is complete.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The cover acts as an intermediary component between the hub bearing and the external environment. It pushes the hub bearing against the stopper from the outer side, creating a mediated force transmission path that secures the hub bearing without requiring direct fastening to the knuckle body.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If the cover pushes the hub bearing against the stopper with strong force, then the rigidity increases, but the pressing force may disperse and cause corrosion

Engineering Contradiction:

ImproverigidityVSAvoidcorrosion risk

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The pressing force from the cover is localized to specific contact points between the hub bearing and the stopper, rather than being distributed broadly. This localized force concentration maintains rigidity while minimizing the area exposed to potential corrosion from dispersed pressing forces.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The pressing force that could potentially cause harmful dispersion and corrosion is converted into a beneficial pre-load that secures the hub bearing against the stopper. The force is directed to create a tight fit and structural integrity rather than allowing harmful movements or gaps.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS20250277513A1Axle assembly and off-road vehicle

Publication Date: 2025.09.04 KAWASAKI MOTORS LTD

AI summary

An axle assembly 2: includes a hub bearing 3 in which an axle shaft 1 is inserted; a knuckle 4 including a shaft hole 4a extending in a direction of an axis C of the axle shaft 1 and housing the hub bearing 3, and a stopper 44 preventing the hub bearing 3 from moving inward in the direction of the axis C inside the shaft hole 4a; and a cover 5 that is attached to the knuckle 4 and pushes the hub bearing 3 against the stopper 44 from an outer side in the direction of the axis C.