CV Joint Hub Assembly With Boot Restraint for Reliable Sealing
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Solution Overview
Problem
Existing constant velocity joints face challenges in securing a firmly coupled state and maintaining an excellent sealing function, particularly when the wheel hub is integrally formed, which affects durability and assembly reliability.
Innovation Solution
The design includes an axle housing with an extension portion that presses an inner race of the hub bearing, a boot surrounding this extension portion to form a restraining force, and a band fastened to the boot to ensure a secure assembly and sealing, with specific geometric configurations to prevent boot escape and ensure sufficient sealability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wheel hub is integrally formed with the constant velocity joint, then assembly complexity is reduced, but the boot coupling reliability deteriorates
Solution Approach 1:
The boot is divided into multiple segments including a boot body, a first boot clamp, and a second boot clamp. These segmented components work together to secure the boot to the constant velocity joint, providing reliable coupling while maintaining the integrated hub design.
Solution Approach 2:
The first boot clamp and second boot clamp are nested within the boot body structure, with the clamps positioned to engage with the constant velocity joint shaft. This nested arrangement ensures secure boot coupling without adding external complexity to the integrated hub assembly.
2Ease of operation
If the boot is loosely coupled to the extension portion, then assembly ease is improved, but sealing function deteriorates
Solution Approach 1:
The boot is designed as a flexible protective shell that covers the constant velocity joint shaft. The boot body, first boot clamp, and second boot clamp work together to create a flexible yet secure sealing arrangement that prevents foreign substance penetration while allowing for assembly ease.
Solution Approach 2:
The boot clamps are configured with curved surfaces that match the geometry of the constant velocity joint shaft. This curvature design ensures proper engagement and sealing along the shaft surface, maintaining sealing effectiveness while facilitating assembly.
3Object-affected harmful factors
If the boot is tightly secured to the extension portion, then sealing function is improved, but assembly difficulty increases
Solution Approach 1:
The boot coupling system is segmented into a boot body and separate boot clamps. This segmentation allows the clamps to be independently positioned and secured, providing tight sealing without requiring complex assembly operations on the entire boot structure.
Solution Approach 2:
The boot clamps are positioned at different locations along the constant velocity joint shaft, creating a multi-point securing arrangement. This spatial distribution of clamps provides effective sealing through multiple contact points while simplifying the assembly process compared to a single complex fastening mechanism.
Data Source
AI summary
A constant velocity joint for a vehicle. The constant velocity joint includes: an axle housing fixed to a knuckle by a hub bearing, and a joint assembly inserted into the axle housing to transmit power from a shaft to the axle housing through a plurality of joint balls. In particular, the axle housing includes an extension portion which is extended from an end portion of the axle housing in a radial direction of the axle housing, and the extension portion provides a pressing force to an inner race of the hub bearing in an axial direction of the axle housing. The constant velocity joint further includes a boot surrounding an outer side of the extension portion and coupled to the extension portion so as to form a restraining force between the extension portion and the boot in the axial direction.