Roller Bearing Flexible Outer Shell for Swashplate Tilting
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Solution Overview
Problem
Axial piston machines with adjustable working volume face challenges in tolerating deflection of the swashplate due to supporting forces from pistons, leading to tilting or oblique positioning of roller bearings, which reduces contact width and affects bearing properties.
Innovation Solution
A roller bearing design featuring concentric circular-arc-shaped raceways with a reduced region adjacent to the contact area, allowing for tilting or oblique positioning without restricting to barrel-shaped or spherical rolling elements, where the outer bearing shell is flexible and can elastically deform to maintain contact, and the contact regions are strategically angled to accommodate deflection in multiple directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If barrel-shaped or spherical rolling elements are used to compensate for tilting of the swivel cradle, then the deflection can be tolerated, but the contact width is reduced and bearing properties are adversely affected
Solution Approach 1:
The outer bearing shell is designed with a reduced region that provides flexibility, allowing the shell to elastically deform and follow the tilting or oblique positioning of the inner raceway. This flexible design enables the bearing to accommodate deflection without requiring barrel-shaped or spherical rolling elements, thereby maintaining optimal contact width and bearing properties while still tolerating the tilting of the swivel cradle.
2Force
If the swivel cradle is allowed to deflect under supporting forces, then the supporting forces can be absorbed, but the tracks come into oblique position and contact width is reduced
Solution Approach 1:
The outer bearing shell incorporates a reduced region that enhances its flexibility, enabling it to elastically deform in response to supporting forces from the pistons. This allows the bearing to absorb the supporting forces while maintaining the contact width between the rolling elements and the raceways, preventing the tracks from coming into oblique position and ensuring optimal bearing properties are preserved.
3Manufacturing precision
If rigid bearing shells are used, then manufacturing precision can be maintained, but the bearing cannot accommodate tilting or oblique positioning
Solution Approach 1:
The outer bearing shell is designed with a reduced region that creates a localized flexible zone, while the rest of the shell maintains its rigid structure and manufacturing precision. This local quality approach allows the bearing shell to be precisely manufactured overall, while the specific reduced region provides the necessary flexibility to accommodate tilting or oblique positioning of the inner raceway without compromising the overall precision of the bearing components.
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
Enables the axial piston machine to tolerate deflection of the swivel cradle without reducing the contact width, maintaining optimal bearing properties and distributing force effectively over the length and width of the rolling elements, thereby improving the operational stability and efficiency of the machine.
Implementation Method 1
the outer bearing shell can follow the tilting or oblique positioning at least in sections... the outer bearing shell is flexible and can elastically deform to maintain contact
Data Source
AI summary
A rolling bearing includes rollers clamped between an inner raceway and an outer bearing shell. The outer bearing shell bears with its outer circumferential surface against an outer component which can be a housing of an axial piston machine. The inner raceway is either formed directly on an inner component, or it is formed on an inner bearing shell, which bears against the inner component. In order to permit tilting of the inner component, wherein the rollers remain in predetermined contact with the two raceways, at least one beveled contact region or a region reduced in another way is provided on the outer circumferential surface of the outer bearing shell.