Two-Piece Wheel Hub Cartridge and Carrier Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wheel hub assemblies integrated with steering knuckles are heavy and difficult to service in the field due to their robust, single-material construction, leading to impractical repair and replacement processes, especially in hostile environments or under heavy loads.
Innovation Solution
A two-piece wheel hub cartridge and carrier assembly where the hub components are modular, allowing for easy removal and replacement, with the hub cartridge containing internal gearing and a wheel speed sensor, and the carrier made of a sturdy material like heat-treated ductile iron, while the cartridge itself can be made of a lighter material for reduced weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hub assembly is made of a single sturdy material like heat-treated ductile iron for robustness, then the strength and reliability are improved, but the weight increases and ease of repair deteriorates
Solution Approach 1:
The hub assembly is divided into two main segments: a carrier (steering knuckle) and a hub cartridge. The carrier contains the mounting structure and steering linkage attachments, while the hub cartridge contains the wheel bearing assembly, gear set, and spindle. This segmentation allows the hub cartridge to be removed and replaced independently without removing the entire hub assembly from the vehicle, significantly improving ease of repair while maintaining the robustness of the carrier made from heat-treated ductile iron.
2Reliability
If the entire hub assembly is replaced when components fail, then reliability is maintained, but the loss of time and complexity of operation increase
Solution Approach 1:
By segmenting the hub assembly into a permanent carrier and a removable hub cartridge, the design enables replacement of only the failed components (bearings, gears, seals) within the hub cartridge rather than replacing the entire assembly. This reduces replacement time significantly and allows field servicing without requiring removal of the steering knuckle from the vehicle.
Solution Approach 2:
The hub cartridge is designed as a extractable unit that can be removed from the carrier without removing the carrier from the vehicle. This extraction capability allows technicians to service the internal components (gear set, bearings, seals) by removing only the cartridge, thereby reducing downtime and operational complexity while maintaining the reliability of the remaining carrier structure.
3Strength
If the hub assembly is made as a single integrated unit, then structural strength is improved, but the device complexity and difficulty of servicing increase
Solution Approach 1:
The hub assembly is segmented into a carrier and hub cartridge connected via a mounting interface. The carrier maintains structural integrity and strength by being made of heat-treated ductile iron and containing the steering knuckle structure. The hub cartridge is a separate serviceable unit containing the gear set, bearings, and spindle. This segmentation reduces service complexity by allowing the cartridge to be removed and replaced without disassembling the entire hub assembly, while the carrier maintains the required structural strength.
Data Source
AI summary
A two piece wheel hub assembly includes a hub cartridge assembly and a vehicle-mounted carrier. The cartridge assembly can be readily attached to and removed from the carrier without removal of the carrier from the vehicle.