Wheel Hub Bearing Mount With Interference Fit and Thermal Compensation
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Solution Overview
Problem
Existing vehicle suspension assemblies face issues with weight increase, complex assembly, and cost due to screw connections, and thermal expansion-related noise and deformation when using interference couplings with light alloy knuckles, which are not effectively addressed by prior solutions.
Innovation Solution
A connection system utilizing a radially outer cylindrical surface interference fit between the hub bearing unit and the knuckle, combined with a minimal number of smaller, lighter screws and cantilever lugs, providing axial retention and compensating for thermal expansion, while reducing weight and assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screw connection with flange or lugs is used to connect the hub bearing unit to the suspension upright, then the connection is reliable, but the overall weight of the suspension assembly increases
Solution Approach 1:
The invention extracts and eliminates the flange or lugs from the outer ring of the rolling bearing. Instead of adding radial extensions (flanges/lugs) to achieve screw connection, the patent uses the cylindrical outer surface of the bearing itself for interference fit connection, thereby removing the extra weight-bearing components while maintaining connection reliability
Solution Approach 2:
The invention merges the connection function directly into the cylindrical outer surface of the bearing ring. The interference fit connection utilizes the existing bearing outer surface without requiring separate flanges or lugs, combining the bearing structure with the connection structure to reduce overall weight
2Device complexity
If an interference coupling is used between the outer ring of the bearing and the suspension upright, then the assembly is simplified, but thermal expansion causes axial and circumferential displacements leading to noise and wear
Solution Approach 1:
The invention changes the dimensional parameters of the interference fit connection. By optimizing the interference fit dimensions and using a reduced set of smaller screws, the connection accommodates thermal expansion while maintaining stability. The parameter optimization allows the connection to remain stable across temperature variations without causing noise or wear
Solution Approach 2:
Instead of using multiple large screws or complex retention mechanisms, the invention uses a reduced set (three or four) of smaller screws providing just sufficient axial retention. This partial action approach is adequate to prevent thermal expansion issues while avoiding over-constraint that would cause stress and deformation
3Reliability
If spring devices are used to compensate for thermal expansion, then noise and wear are reduced, but weight increases and assembly operations become complicated
Solution Approach 1:
The invention enables the connection system to self-accommodate thermal expansion through the optimized interference fit and minimal screw configuration. The connection structure itself provides the compensation mechanism without requiring additional spring devices or complex assembly operations, achieving self-service thermal compensation
4Reliability
If resilient rings are inserted to provide axial retention, then thermal expansion is compensated, but the cavities create weaknesses in thin bearing rings promoting deformations or crack formation
Solution Approach 1:
The invention extracts and eliminates the resilient rings from the bearing structure. By removing these rings and their associated cavities, the patent prevents the creation of stress concentration points that would weaken thin bearing rings and promote deformations or cracks, while maintaining axial retention through the optimized screw connection
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves reduced weight, simplified assembly, cost savings, and improved rigidity and durability by minimizing noise and wear, maintaining performance across temperature variations and high loads.
Implementation Method 1
a radially outer lateral cylindrical surface (16) of the radially outer ring or element (6) of the hub bearing unit (2), configured to couple by interference fit with a radially inner lateral cylindrical surface (18) of the reception seat (5)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
In a vehicle suspension assembly (1), a connection system (4) between a hub bearing unit (2) and a suspension upright or knuckle (3), including: a radially outer lateral cylindrical surface (16) of a radially outer ring or element (6) of the hub bearing unit, configured for interference coupling with a radially inner lateral cylindrical surface (18) of a reception seat (5) of the suspension upright or knuckle; a pair of, or three, lugs (19) that protrude radially in cantilever fashion from the radially outer ring or element of the hub bearing unit, each being provided with an axial through hole (21); a frontal surface (23) of the suspension upright or knuckle, configured for receiving the lugs (19) in axial abutment; and screws (24) fitted in a through manner through the axial holes of the lugs and screwed into respective threaded holes (25) formed in the suspension upright or knuckle, on the frontal surface (23).