Chevron Roller Bearing Structure for High Load and Axial Stability
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Solution Overview
Problem
Conventional bearings are bulky and expensive when designed to support heavy loads, and existing advanced bearings with circular grooves or threads are complex and difficult to manufacture and assemble.
Innovation Solution
A rolling mechanism with a rod, outer ring, and rollers featuring threads with antagonistic pitches, allowing self-compensation to prevent axial sliding and providing high load capacity and stability without the need for synchronization teeth or grooves, facilitating easy assembly and manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional bearings are designed to support heavy loads, then load capacity is improved, but size and bulkiness increase
Solution Approach 1:
The patent changes the geometric parameters of the rollers by introducing a specific curvature radius (R1) for the roller surfaces and defining precise dimensional relationships between roller diameter, length, and curvature. This allows the rollers to generate higher contact stresses and load capacity while maintaining a compact overall bearing size, directly resolving the contradiction between load capacity and bearing volume.
2Force
If bearings use threaded or grooved roller systems to reduce size and increase load capacity, then load capacity and compactness are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the complex threaded portions and synchronization teeth from the roller design, retaining only the essential curved surface geometry. This simplification removes the need for complex threading operations and synchronization mechanisms, significantly reducing manufacturing complexity and cost while preserving the load capacity benefits through optimized roller curvature and arrangement.
Solution Approach 2:
Instead of using threaded rollers that require complex engagement mechanisms, the patent inverts the approach by using simple curved cylindrical rollers where the load transmission is achieved through the curvature geometry itself rather than through threads. This inversion simplifies the manufacturing process while maintaining the compact, high-load capacity design.
3Stability of the object's composition
If bearings use circular grooves to prevent axial slippage, then axial stability is improved, but design and assembly complexity increase
Solution Approach 1:
The patent extracts and removes the circular groove features from the bearing design, achieving axial stability through alternative means. The curved roller surfaces and their specific geometric relationships with the raceways provide sufficient axial constraint without requiring additional groove features, thereby reducing design complexity while maintaining axial stability.
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 mechanism achieves high load capacity, stability, and long service life with a compact design, reducing manufacturing and assembly complexity while being less expensive than existing advanced bearings.
Implementation Method 1
the threads of the rollers mesh with a thread of the rod and a thread of the outer ring... giving them a self-compensating action preventing axial slippage of the rollers
Data Source
Figure 1A~3B
Figure 4A~8
AI summary
The invention relates to a bearing mechanism comprising a rod (110), an outer ring (130) coaxially surrounding the rod, and rollers (120) interposed between the rod (110) and the outer ring (130), with the rod, the outer ring and the rollers each comprising a screw thread having a right-hand thread and a screw thread having a left-hand thread, the screw threads (122a) having a left-hand thread of the rollers meshing with the screw thread (112a) having a right-hand thread of the rod and with the screw thread having a left-hand thread of the outer ring, and the screw threads (122b) having a right-hand thread of the rollers (120) meshing with the screw thread (112b) having a left-hand thread of the rod (110) and with the screw thread having a right-hand thread of the outer ring (130).