Angular Contact Ball Bearing High Load Capacity Design
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Solution Overview
Problem
Existing transmission assemblies in motor vehicles face high friction losses due to the use of tapered roller bearings, which are costly and inefficient, and single row angular contact ball bearings are limited to low axial and radial loads, requiring additional support for higher load applications.
Innovation Solution
A highly loadable single row angular contact ball bearing design with specific size ratios between the outer and inner ring diameters and ball diameters, along with optimized shoulders and ball pressure angles, allows for increased load capacity and reduced friction, enabling the use of single row bearings in high-load situations, such as those typically supported by tapered roller or double row angular contact ball bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If tapered roller bearings are used to support high axial and radial loads, then load capacity is improved, but friction losses increase
Solution Approach 1:
The patent changes the geometric parameters of the bearing by establishing specific ratio relationships between ball diameter (Dw), outer ring outer diameter (D), and inner ring inner diameter (d). The formula Dw ≥ 0.35(D-d) ensures balls occupy sufficient volume to carry high loads while maintaining low friction characteristics of ball bearings instead of roller bearings
Solution Approach 2:
Instead of using the conventional approach of selecting bearing type based on load requirements (tapered rollers for high loads), the patent inverts the logic by proving that single-row angular contact ball bearings can handle high loads when the ball-to-ring diameter ratios are optimized, thus achieving high load capacity with lower friction
2Strength
If double row angular contact ball bearings are used to support high loads, then load capacity is improved, but manufacturing cost increases
Solution Approach 1:
The patent segments the load-carrying function into a single row of balls with optimized dimensions rather than requiring two rows. The ball diameter is increased to compensate for the single-row configuration, maintaining load capacity while simplifying the bearing structure to one row instead of two, thereby reducing manufacturing complexity and cost
Solution Approach 2:
By changing the ball diameter parameter to be at least 35% of the radial height (D-d), the single-row bearing achieves load capacity comparable to double-row configurations without the added complexity and cost of manufacturing and assembling two rows of balls
3Ease of manufacture
If single row angular contact ball bearings are designed with standard size ratios, then ease of manufacture is improved, but load capacity is limited to low axial and radial loads
Solution Approach 1:
The patent modifies the standard size ratios by enforcing the relationship Dw ≥ 0.35(D-d), which increases ball size relative to the ring dimensions. This parameter change enables single-row bearings to handle high loads while remaining manufacturable using standard angular contact ball bearing designs
Solution Approach 2:
The patent applies local quality optimization by focusing the load-carrying capability on the ball elements themselves through increased ball diameter, rather than increasing the number of balls or rows. This localized enhancement of ball size provides high load capacity in a single row configuration
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 design achieves higher load ratings and reduced friction compared to traditional solutions, making it suitable for high-load applications while being cost-effective and less sensitive to misalignments, and simplifies assembly by allowing captive ball retention.
Implementation Method 1
an outer ring (3) including a first rolling surface (15), an inner ring (5) including a second rolling surface (19), between which exactly one row of balls (7) is disposed
Data Source
AI summary
An angular contact ball bearing includes an outer ring having an outer diameter D and a first rolling surface and an inner ring having an inner diameter d and a second rolling surface, and no more than one row of balls between the first rolling surface and the second rolling surface, each of the balls having a diameter Dw. The diameter Dw of the balls, the outer diameter D of the outer ring, and the inner diameter d of the inner ring satisfy the relationship:Dw>0.7*(D-d)2.