FRP Motion Guide Device Mounting Strength via Orthogonal Metal Inserts
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Solution Overview
Problem
Conventional motion guide devices made of fiber-reinforced plastics (FRP) face challenges in securely mounting external members due to the difficulty in ensuring strength when using screw holes or heliserts, which can rotate under torque, leading to instability.
Innovation Solution
A motion guide device design that incorporates a track member and a movable member with a metal rolling part and a mounting part, where the mounting part has holes or surfaces orthogonal to the lamination direction of FRP reinforced fiber sheets, allowing for secure jointing using bolts or adhesives, thereby enhancing the stability and accuracy of external member mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If FRP is used for motion guide devices to achieve weight reduction, then weight is reduced, but mounting strength is insufficient
Solution Approach 1:
The patent uses fiber-reinforced plastics (FRP) as the base material for the motion guide device to achieve weight reduction, while incorporating metal materials (such as aluminum alloys or stainless steel) for the rolling part and mounting part. This composite material approach allows the device to maintain both lightweight properties and sufficient mounting strength.
Solution Approach 2:
The patent applies different materials to different parts of the device: FRP is used for the track body where weight reduction is prioritized, while metal materials are used for the rolling part (contacting rolling bodies) and mounting part (for external member installation). This local differentiation ensures that critical areas have the necessary strength and wear resistance while the overall device remains lightweight.
2Ease of manufacture
If helisert is inserted in FRP lamination surface for mounting, then mounting is simplified, but fastening strength is insufficient due to rotation under torque
Solution Approach 1:
The patent designates specific regions with different functions: the rolling part for motion guidance, the mounting part for external member installation, and the track body for structural support. By concentrating mounting holes in the metal mounting part rather than the FRP track body, the patent ensures that fastening operations occur in a material suitable for such operations, preventing helisert rotation while maintaining manufacturing ease.
Solution Approach 2:
The metal mounting part acts as an intermediary between the FRP track body and the external members. It provides a stable, rotation-resistant interface for fastening operations while being firmly attached to the FRP structure, thus mediating between the lightweight FRP body and the requirement for strong, reliable mounting.
3Strength
If metal material is used for structural members to ensure strength, then strength is improved, but weight increases
Solution Approach 1:
The patent selectively applies metal materials only to specific regions where strength and wear resistance are critical (the rolling part contacting rolling bodies and the mounting part for external members), while using lightweight FRP for the track body. This localized material assignment optimizes the strength-to-weight ratio by placing heavy materials only where absolutely necessary.
Solution Approach 2:
The patent creates a hybrid structure combining FRP and metal materials within the same device. The FRP track body provides lightweight structural support, while the metal rolling part and mounting part provide localized strength and functionality. This composite construction achieves overall strength requirements without the weight penalty of using metal throughout the entire device.
Data Source
AI summary
A track member or a movable member constituting a motion guide device includes a rolling part formed of a metal material contacting with a plurality of rolling bodies and forming a rolling body rolling surface a, a mounting part formed of a metal material having a mounting hole for mounting an external member, and a track body or a movable body formed of FRP jointed with the rolling part and the mounting part and forming the track member or the movable member, and the mounting part and the track body or the movable body have joint holes, opened in a direction orthogonal to a lamination direction of FRP reinforced fiber sheets S forming the track body or the movable body at a time of the joint, and can be jointed using jointing means. An external member can be securely mounted to the motion guide device formed of FRP.