Threaded Roller Bearing Structure for High Load Without Axial Slippage
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Solution Overview
Problem
Conventional rolling bearings are large in size when dimensioned for high loads, complex in design and manufacture, and costly, with existing advanced bearings being sophisticated and difficult to use.
Innovation Solution
A rolling bearing mechanism with a rod, outer ring, and rollers featuring alternating right-handed and left-handed threads, which self-compensate to prevent axial slippage, allowing for high load capacity, simplicity in manufacture and assembly, and reduced cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional rolling bearings are dimensioned to bear high loads, then load capacity is improved, but overall size increases
Solution Approach 1:
The patent changes the geometric parameters of the rollers by introducing threaded portions with specific helix angles and pitch values. The threaded geometry allows the rollers to transmit higher loads through inclined contact surfaces, increasing load capacity without proportionally increasing the bearing's overall dimensions. The pitch and helix angle parameters are optimized to achieve compact high-load capacity.
Solution Approach 2:
The bearing combines different geometric features on the same roller elements - cylindrical portions for rolling contact and threaded portions for load transmission. This composite geometric structure allows the bearing to achieve high load capacity in a compact form by utilizing both rolling and threaded contact mechanisms simultaneously.
2Force
If rolling bearings use threaded rollers with circular grooves, then load capacity and compactness are improved, but design and manufacture complexity increases
Solution Approach 1:
The patent extracts and eliminates the circular groove feature from the threaded rollers, retaining only the threaded portions. This simplification removes the complexity of machining circular grooves while maintaining the load capacity benefits of threaded geometry. The rollers now have only helical threads, which are easier to manufacture using standard threading processes.
Solution Approach 2:
Instead of combining circular grooves with threads on the rollers, the patent inverts the approach by using only threaded portions and providing circular grooves on the rings instead. This reversal simplifies roller manufacturing while achieving the same functional goals of load transmission and roller retention.
3Reliability
If threaded portions of rollers mesh with threaded portions of rings, then axial slippage is prevented, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different thread characteristics to different axial segments of the rollers. The first threaded portions have one pitch value and helix angle, while the second threaded portions have different pitch and helix angle values. This local differentiation allows optimization of thread meshing in different regions, improving reliability while accommodating manufacturing tolerances through varied geometric parameters.
Solution Approach 2:
By varying the pitch and helix angle parameters of the threaded portions along the axial direction, the patent creates a differential thread geometry that can compensate for manufacturing variations. The different pitch values in different segments allow the threads to mesh reliably even with moderate manufacturing tolerances, reducing the stringency of precision requirements.
4Reliability
If advanced rolling bearings use both circular grooves and threads, then axial slippage is prevented, but assembly complexity increases
Solution Approach 1:
The patent removes the circular grooves from the rollers, eliminating the need to align and assemble both groove and thread features simultaneously. The rollers with only threaded portions can be assembled more simply into the rings that have the circular grooves, reducing assembly complexity while maintaining axial slippage prevention through the threaded meshing.
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 provides excellent stability and load capacity with minimal slippage, ease of assembly, and long lifespan, eliminating the need for synchronization sets of teeth and grooves, while being adaptable and cost-effective.
Implementation Method 1
each of the rollers has at least one threaded portion and at least one of the rings has at least one threaded portion, the threaded portions of the rollers meshing with the threaded portion of said ring
Implementation Method 2
a rolling bearing mechanism comprising a rod, an outer ring surrounding the rod coaxially, and rollers having longitudinal axes parallel to the longitudinal axes of the rod and of the outer ring, each roller being interposed between the rod and the outer ring
Data Source
AI summary
A rolling bearing mechanism comprising a rod (110), an outer ring (130) surrounding the rod coaxially, and rollers (120) interposed between the rod (110) and the outer ring (130), with the rod, the outer ring, and the rollers each having a respective right-handed thread and a respective left-handed thread, the left-handed threads (122a) of the rollers meshing with the right-handed thread (112a) of the rod and with the left-handed thread of the outer ring, and the right-handed threads (122b) of the rollers (120) meshing with the left-handed thread (112b) of the rod (110) and with the right-handed thread of the outer ring (130).