Vehicle Hub Cap Air Duct Layout for Protected Axle Transport

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Solution Overview

Problem

Existing tire pressure regulation systems are prone to damage during axle transport due to exposed air duct systems, and the rotational position is often not specified, leading to installation issues and obscuration of informational text or logos.

Innovation Solution

A hubcap system with an air guide system that rotates axially, featuring a central opening for the air duct, primary and secondary connections oriented in specific directions, and positive locking mechanisms to prevent damage and ensure proper alignment, allowing flexible and secure attachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the air duct system is attached to the hub cap only during axle installation, then the air duct system is protected from damage during transport, but the installation process becomes more complex and generates additional waste parts

Engineering Contradiction:
Improveprotection of air duct systemVSAvoidinstallation process
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The hub cap system is divided into separate components: the hub cap itself and the air duct system. The air duct system can be attached to the hub cap at a later stage (during axle installation) rather than being permanently integrated, allowing the hub cap to be transported separately without the fragile air duct components. This segmentation enables protective measures to be applied only when necessary.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The hub cap is prepared in advance with mounting features (such as internal threads or mounting surfaces) that will receive the air duct system during axle installation. This preliminary preparation allows for delayed attachment of the air duct system while ensuring proper alignment and connection when the time comes, avoiding the need for complex on-site modifications.

Inventive Principle:
Principle #10Preliminary action

2Reliability

If the air duct system is screwed into an internal thread of the hub cap, then the air duct system can be securely attached, but the installation becomes more complex and generates additional waste parts

Engineering Contradiction:
Improveattachment securityVSAvoidinstallation simplicity
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The air duct system is designed to be nested within or integrated with the hub cap structure. The air duct system can be inserted into the hub cap and secured using the internal threading, creating a compact assembled unit. This nesting approach allows for secure attachment while simplifying the overall installation process, as the components are designed to fit together in a predetermined manner.

Inventive Principle:
Principle #7Nested doll (Nesting)

3Adaptability or versatility

If the rotational position of the air duct system is not specified, then the installation is more flexible, but the air duct system or connected hoses can obscure informational text and/or logos

Engineering Contradiction:
Improveinstallation flexibilityVSAvoidvisibility of text and logos
Core Design Contradiction:
Adaptability or versatilityVSLoss of information

Solution Approach 1:

The hub cap and air duct system are designed with asymmetric features that define a specific rotational position. For example, the air duct system may have a unique orientation relative to the hub cap's mounting features, or the hub cap may have asymmetric branding elements that dictate the correct rotational position. This asymmetry ensures that when the air duct system is installed, it automatically assumes the correct orientation, preventing it from obscuring informational text or logos while maintaining installation flexibility through the standardized mounting interface.

Inventive Principle:
Principle #4Asymmetry

Data Source

PatentEP4392266B1Hub cap system for a vehicle
Publication Date: 2025.12.31 SAF HOLLAND GMBH
  • EP4392266B1 patent drawingFigure 1~2
  • EP4392266B1 patent drawingFigure 3~4
  • EP4392266B1 patent drawingFigure 5~6

AI summary

A hub cap system (1) for a vehicle, more particularly a utility vehicle, comprises a hub cap (2) and an air duct system (3). The hub cap (2) is designed for rotation about an axial direction (A) and has a central hole (32) that extends particularly in the axial direction (A). The air duct system (3) has a primary port (6) and a secondary port (4) and extends partially in or through the center hole (32).