Vehicle Axle Bearing Lock Layout for Compact Differential Mounting
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Solution Overview
Problem
The challenge is to create a compact axle system for vehicles with independent wheel suspension, which supports drive shafts effectively while maintaining compactness and ease of mounting and maintenance, given the constraints of limited vehicle width and the need for minimal wheel reduction.
Innovation Solution
The axle system incorporates a first bearing with a smaller outer diameter than the radial dimension of the joint, allowing for improved compactness without compromising support or accessibility. A specific tightening member with a manoeuvring portion is used to axially lock the first bearing, ensuring secure assembly and maintenance without play.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a first bearing with smaller outer diameter than the radial dimension of the joint is used, then compactness of the differential unit is improved, but accessibility of the first bearing for tightening becomes difficult
Solution Approach 1:
The tightening member is designed with an offset relation, positioning the manoeuvring portion in a different spatial dimension (radially outward) from the joint area. This allows access to the tightening member through a different dimensional path, solving the accessibility problem while maintaining the compact bearing design.
Solution Approach 2:
The tightening member acts as an intermediary component that bridges the gap between the compact first bearing and the external tightening tool. By positioning the manoeuvring portion offset from the joint, it provides an intermediate access point that allows operators to tighten the bearing without direct access to the bearing itself.
2Volume of moving object
If the outer diameter of the first bearing is reduced for compactness, then the differential unit becomes more compact, but the bearing may be hidden by the joint or other components
Solution Approach 1:
The tightening member serves as an intermediary that provides external access to the hidden first bearing. Even though the bearing itself remains concealed within the compact differential unit, the tightening member extends the functional interface to the exterior, allowing detection and operation without exposing the bearing.
Solution Approach 2:
The solution moves the interaction interface from the bearing's direct location to a different dimensional space through the offset tightening member. The manoeuvring portion is positioned in a radial direction offset from the joint, creating an alternative access pathway that bypasses the obscuring components.
3Strength
If drive shafts are made larger and longer to support torque without wheel reduction, then torque capacity is improved, but vehicle width constraint is violated
Solution Approach 1:
The support function is segmented between two bearings: the first bearing (smaller, compact) positioned near the joint and the second bearing (larger) positioned elsewhere in the differential unit. This segmentation allows the drive shaft to be adequately supported without requiring excessive length or diameter, maintaining compactness while preserving torque capacity.
Solution Approach 2:
Instead of providing full support through a single large bearing or extending the drive shaft excessively, the solution uses partial support from a compact first bearing combined with the second bearing. This partial action approach achieves sufficient torque support while maintaining the drive shaft and differential unit within width constraints.
Data Source
Figure 1~3
Figure 4a
Figure 4b~7
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.