Compact Vehicle Axle Mounting With Offset Bearing Lock Access
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Solution Overview
Problem
The challenge is to create a compact axle system for vehicles, particularly trucks, that supports drive shafts effectively while maintaining compactness and ease of mounting and maintenance, especially in independent wheel suspension configurations where space constraints and torque requirements are stringent.
Innovation Solution
The axle system incorporates a differential unit with a first bearing having a smaller outer diameter than the radial dimension of the joint, and a specific tightening member with an offset manoeuvring portion to securely lock the bearing in place, allowing for compact design without compromising assembly or maintenance accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a compact differential unit is used to reduce transverse width, then vehicle width constraint is satisfied, but drive shaft support and bearing accessibility become problematic
Solution Approach 1:
The tightening member's manoeuvring portion is positioned in an offset relation relative to the joint, moving the access point from the radial dimension to an offset position that is visible and accessible during tightening phase, thereby solving the accessibility problem while maintaining compact radial dimensions
2Area of stationary object
If a smaller first bearing is used to improve compactness, then radial space is reduced, but bearing accessibility and tightening become difficult
Solution Approach 1:
The tightening member is designed with a manoeuvring portion positioned in an offset relation relative to the joint, allowing access from an offset direction rather than radially, enabling mounting of compact bearings without compromising accessibility
Solution Approach 2:
The tightening member acts as an intermediary tool that bridges the gap between the compact bearing structure and the mounting operation, providing an offset access point that facilitates easier installation and maintenance
3Strength
If drive shaft length is increased to support torque and working angles, then torque transmission capability is improved, but vehicle width constraint is violated
Solution Approach 1:
The differential unit is segmented into a first housing and a second housing arranged around the first housing, allowing compact packaging of drive shaft support structures that maintain torque capability while reducing transverse width
Solution Approach 2:
The bearing support structure utilizes an offset arrangement where the manoeuvring portion is positioned in an offset relation to the joint, enabling compact radial dimensions while maintaining adequate drive shaft support length through optimized spatial configuration
Data Source
AI summary
An axle system (150) for a vehicle comprises: —a differential unit (10) including a first housing (24) and a second housing (20) which rotationally receives at least part of said first housing; —at least one drive shaft (11) having one end configured to be connected to a wheel of the vehicle and one end connected to the differential unit (10) and rotationally received in the first housing (24), the drive shaft (11) including at least one joint (110) connecting two portions (114a, 114d) of the drive shaft (11) to transmit rotary motion between said portions; —a first bearing (30) secured around the drive shaft (11), placed between the drive shaft and the first housing (24), having an outer diameter (D30) smaller than the radial dimension (D) of the joint (110); —a second bearing (40) placed between the first housing (24) and the second housing (20); —at least one tightening member (50) to axially lock the first bearing outer ring (32) relative to the first housing (24). The tightening member comprises at least one manoeuvring portion (51) which is arranged in an offset relation relative to the joint (110), when looking axially towards the differential unit (10), so that the tightening member manoeuvring portion (51) is visible and accessible, at least during a tightening phase of an axle system mounting process.