Rolling Element Accommodating Tool Reinforcing Film
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Solution Overview
Problem
Conventional rolling element accommodating belts in linear motion devices face issues with filler leakage when using short fibers, inadequate tension strength with long fibers, and excessive bending strength affecting smooth motion, due to reliance on adhesive forces between fibers and resin.
Innovation Solution
The use of reinforcing films with concavities and convexities in the longitudinal direction, integrated with the main body through insert molding, provides a physically engaged bonding mechanism that enhances tension strength without compromising flexibility, by varying the cross-sectional area and ensuring the films are in contact or proximity to spacers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If long fibers such as carbon or glass are embedded as reinforcing material, then filler leakage is prevented, but effective reinforcing is not accomplished and sufficient tension strength is not achieved due to resin peeling away from the long fibers
Solution Approach 1:
The reinforcing film is designed with varying width along its length, creating local variations in cross-sectional area. This allows different regions of the film to serve different functions: wider regions provide enhanced tension strength while narrower regions maintain flexibility and proper engagement with spacers, preventing resin peeling and ensuring effective stress transfer.
Solution Approach 2:
The invention uses a composite structure combining a base resin material with embedded long fiber reinforcing films. The film itself is made of reinforcing material (such as carbon or glass fibers) that provides high tension strength, while the resin matrix binds the film to the spacer structure, creating a composite that achieves both strength and reliable bonding.
2Strength
If long fibers of great tension strength are used, then tension strength is improved, but excessive bending strength affects the smoothness of the linear guiding motion
Solution Approach 1:
The reinforcing film features non-uniform width distribution along its length, with narrower sections positioned at critical locations. These narrower sections reduce the overall bending stiffness of the belt while maintaining high tension strength in the wider sections, thereby enabling smooth linear guiding motion without compromising the tension-carrying capability.
3Loss of substance
If conventional long fibers are used as reinforcing material, then filler leakage is prevented, but the binding force between long fibers and resin depends on adhesive force at the interface, causing resin peeling before fibers exhibit their tension strength
Solution Approach 1:
The invention employs a composite construction where long fiber-reinforced film material is embedded within the resin matrix of the spacer structure. This ensures the reinforcing fibers remain contained within the resin, preventing filler leakage, while the composite structure enables effective stress transfer from the resin to the high-strength fibers, allowing the fibers to exhibit their full tension strength potential.
Data Source
AI summary
Provided is a practical rolling element accommodating tool that engages firmly with a reinforcing material without compromising flexibility, wherein tension strength of the reinforcing material is sufficiently exhibited. A rolling element accommodating tool for rotatably accommodating a plurality of rolling elements (4) at predetermined intervals is placed along an endless circulation path (5) along which the rolling elements (4) circulate in a linear motion device (1) provided with the endless circulation path (5) and comprising a rail element (2) and a linear moving element (3) that moves linearly relative to the rail element (2); wherein the rolling element accommodating tool has a main body configured from spacers (6) individually provided between adjacent rolling elements (4), and connecting parts (7) oriented in a direction orthogonal to the direction in which the spacers (6) are aligned, protruding on both sides of the rolling elements (4) in a state of accommodating the rolling elements (4), and serially connecting the spacers; reinforcing films (9) having the same length in the longitudinal direction as the connecting parts (7) being contained within the connecting parts (7); and the reinforcing films (9) being formed at large widths in predetermined positions.