Rotatable Lifting Point With Conical Roller Bearing Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing attachment points with non-spherical rolling bearing bodies face assembly challenges and require precise manufacturing to ensure freedom from play, which can lead to issues with rotary mobility and torque transmission.
Innovation Solution
The attachment point design features a centrally arranged breakthrough in the top part, allowing the lower part to be integrated, with a locking body connected to the shaft section of the lower part. This design provides axial cohesion and allows for the use of non-spherical rolling bearing bodies without the need for precise alignment, ensuring rotary mobility and torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-spherical rolling bearing bodies are used to improve rotary mobility, then rotational mobility is improved, but assembly complexity increases and manufacturing precision requirements increase
Solution Approach 1:
A cage is introduced as an intermediary component to hold and guide the non-spherical rolling bearing bodies (cylindrical rollers) between the conical bearing surfaces. The cage pre-positions the rollers along the cone generator lines, ensuring proper orientation and distribution without requiring complex assembly procedures. This mediator component transforms the assembly process from a complex precision task into a simpler operation where the cage does most of the alignment work.
Solution Approach 2:
The bearing surfaces are designed with conical geometry rather than spherical or flat surfaces. This parameter change in the bearing surface shape allows the non-spherical rolling elements (cylindrical rollers) to maintain stable contact and orientation. The cone angle is specifically chosen to match the geometry of the rollers, creating a self-aligning effect that simplifies assembly while maintaining rotary mobility under axial loads.
2Reliability
If non-spherical rolling bearing bodies are used to maintain rotary mobility under axial tensile loads, then rotational mobility is maintained, but manufacturing precision requirements increase
Solution Approach 1:
The bearing surfaces are designed with conical geometry rather than spherical or flat surfaces. This parameter change in the bearing surface shape allows the non-spherical rolling elements (cylindrical rollers) to maintain stable contact and orientation. The cone angle is specifically chosen to match the geometry of the rollers, creating a self-aligning effect that reduces sensitivity to manufacturing tolerances.
Solution Approach 2:
Conical surfaces with appropriate curvature are used instead of flat or spherical surfaces. The curved conical surfaces guide the cylindrical rollers along their generators, providing natural alignment and reducing the impact of manufacturing variations. The curvature of the cone surfaces works with the cylindrical shape of the rollers to maintain stable contact under axial tensile loads without requiring extremely tight manufacturing tolerances.
3Ease of operation
If conical bearing surfaces with rolling bearing bodies are used, then rotary mobility is achieved, but the structure becomes more complex
Solution Approach 1:
The cage is integrated directly into the bearing assembly structure, merging the functions of holding the rollers and guiding them along the conical surfaces. The cage is positioned within the bearing housing and works as an integral part of the rotary mechanism, eliminating the need for separate alignment devices or complex mounting structures. This merging reduces the number of discrete components and simplifies the overall structure.
Solution Approach 2:
The conical bearing surfaces serve multiple functions: they provide the rotational interface, guide the cylindrical rollers, maintain proper orientation under axial loads, and distribute the tensile forces. The cage simultaneously holds the rollers, guides their position, and ensures even distribution along the cone surface. This multi-functionality reduces the need for additional specialized components, simplifying the overall structure.
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 simplifies assembly, maintains rotary mobility even with axial tensile loads, and allows for the exchange of rolling bearing bodies, enhancing handling security and reducing manufacturing complexities.
Implementation Method 1
rolling bearing bodies with a shape defined by an axis of rotation and a lateral surface which is rotationally symmetrical about the axis of rotation are arranged between the two bearing surfaces
Data Source
Figure 1
Figure 2~4
Figure 3
AI summary
Described is a lifting point 1 with a connecting means for connecting the lifting point 1 to a lower part 3 having a handleable object 47 and with an upper part 2 rotatable relative to the lower part 3 and connected thereto with a connecting element 4 for connecting a lifting, lifting or lashing device, wherein for rotatable mounting of the upper part 2 relative to the lower part 3 the upper part 2 has an upper bearing surface 12 that tapers conically in the axial direction, and the lower part 3 has a lower bearing surface 8 that tapers conically in the same direction, and wherein between the two bearing surfaces 8, 12 rolling bearing bodies 18 with a shape defined by an axis of rotation and a cylindrical surface rotationally symmetrical about the axis of rotation are arranged, the axes of which are aligned in the direction of the conical taper of the bearing surfaces 8, 12.A special feature is that the rolling bearing bodies 18 with their axes of rotation enclose an angle of 30° or more and not more than 60° with respect to the axis of rotation of the upper part 2, the lower part 3 has a head section 9 and a shaft section 10, 10.1 integrally formed thereon, the shaft section 10 having a smaller diameter than the head section 9, the bearing surface 12 of the lower part 3 being provided by a cylindrical surface section of the head section 9, the lower part 3 extending through the upper part 2, and a locking element 25 connected to the shaft section 10 of the lower part 3, extending at least partially under the upper part 2 in a radial direction, is provided to hold the lower part 3 and the upper part 2 together.