Linear Roller Bearing Element With Segmented Carrier Raceways
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Solution Overview
Problem
Linear roller bearing elements experience deformation and uneven load distribution when subjected to off-center forces or torque, leading to poor running quality, increased noise, and reduced service life, especially in compact designs with limited support material.
Innovation Solution
A linear roller bearing element featuring two endless rolling element channels with carrier raceways and return channels, connected by turnaround channels, which maintain a fixed relationship between raceway elements, allowing for even load distribution and automatic adaptation to the guide rail, reducing noise and wear, and increasing the load-bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the guide rail and guide carriage are composed of solid metal with deep ground raceways to handle off-center loads, then the load-bearing capacity is improved, but the manufacturing cost increases significantly and the dimensions must be increased
Solution Approach 1:
The invention divides the carrier body into multiple independent carrier bodies, each with its own rolling element channel. This segmentation allows each carrier body to independently support and distribute loads, enabling the system to handle off-center loads without requiring excessively deep ground raceways in a single monolithic structure, thereby reducing manufacturing costs while maintaining load-bearing capacity.
Solution Approach 2:
The invention combines multiple carrier bodies with rolling element channels into a single integrated guide carriage structure. This merging allows the system to collectively bear and distribute off-center loads across multiple channels, achieving high load-bearing capacity without requiring each individual channel to be deeply ground, thus reducing manufacturing complexity and cost.
2Adaptability or versatility
If the carrier body is designed with a partially cylindrical outer surface to enable self-adjusting swiveling, then the adaptability to off-center loads is improved, but the running quality deteriorates due to displacement between carrier bodies and rolling element return
Solution Approach 1:
The invention segments the carrier body into multiple independent carrier bodies, each capable of self-adjusting swiveling motion. This segmentation ensures that each carrier body can independently adapt to load variations while maintaining its own precise rolling element circulation path, preventing the displacement and running quality issues that would occur in a monolithic self-adjusting structure.
Solution Approach 2:
The invention introduces dynamic self-adjusting capability through the partially cylindrical outer surface of each carrier body, allowing each segment to swivel independently to adapt to off-center loads. This dynamic adaptation is achieved without compromising running quality because each carrier body maintains its own stable rolling element channel geometry, preventing the displacement problems associated with monolithic self-adjusting designs.
3Strength
If multiple rows of rolling elements are used to increase load-bearing capacity, then the strength is improved, but the structure becomes more complex and the manufacturing precision requirements increase
Solution Approach 1:
The invention segments the multi-row rolling element system into multiple independent carrier bodies, each with its own rolling element channel. This segmentation simplifies the overall structure by making each carrier body a modular unit that can be independently manufactured and assembled, reducing the complexity of manufacturing precision requirements compared to a single complex multi-channel structure.
Solution Approach 2:
The invention uses identical or similar carrier bodies with the same rolling element channel geometry as interchangeable components. This copying approach allows for standardized manufacturing processes and reduces the precision requirements for each individual carrier body, as they are replicated units that can be manufactured using the same templates and procedures.
Data Source
AI summary
A linear roller bearing element with an endless rolling element channel is composed of a carrier raceway for the load-bearing rolling elements on a carrier body, a return channel for rolling elements that are returning, and turnaround channels that connect the carrier raceway and the return channel at both ends with each other in an endless manner, the turnaround channels being bounded by end covers. The roller bearing element has two rolling element channels with two longitudinally extending carrier raceways located next to each other within a common plane and with clearance between them, on the carrier body for load-bearing rolling elements, and two assigned return channels for rolling elements that are returning, and respective turnaround channels. With a linear roller bearing guide, these roller bearing elements are located between a guide rail and a guide carriage—which is supported such that it is displaceable relative to the guide rail—in order to provide support.