Parallel Spacer for Linear Guideway with Gothic Arch Contact
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Solution Overview
Problem
Existing linear guideway spacers face challenges such as high manufacturing difficulty and cost due to injection molding, increased elastic fatigue from roller collisions, and significant slide friction affecting smooth operation.
Innovation Solution
A unitary spacer structure with a retaining portion, equidistant connecting portions, and parting portions featuring Gothic arch-style concave contact surfaces to accommodate rollers, reducing friction and preventing skewing, and designed for mass production with a height less than the groove in the circulating channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If rollers are connected by a long chain with many rollers, then the linear guideway covers longer distance, but production time increases
Solution Approach 1:
Multiple spacers and rollers are combined into a single integrated injection molding process, allowing the entire chain assembly to be produced in one operation rather than assembling individual components sequentially. This merging dramatically reduces production time while maintaining the ability to create long linear guideways.
2Reliability
If spacers use concave contact surfaces with full surface contact with rollers, then rollers are well supported, but friction increases significantly
Solution Approach 1:
The contact surfaces of the parting portions are designed with specific local geometric properties (Gothic arch style) that concentrate contact to optimal points or lines rather than full surface contact. This local quality optimization maintains adequate roller support while significantly reducing friction compared to full surface contact designs.
3Reliability
If spacers are arranged with retaining portions at both ends of rollers, then rollers are well retained, but space occupation increases reducing load capacity
Solution Approach 1:
The design extracts the retention function from bulky end-cap structures and implements it through streamlined parting portions integrated into the spacer body. This extraction eliminates unnecessary material and space occupation while maintaining effective roller retention through the Gothic arch contact geometry.
4Ease of manufacture
If conical connecting portions are used to connect rollers, then assembly is simplified, but load capacity and rigidity are weakened
Solution Approach 1:
The connecting portions utilize optimized curved geometries (Gothic arch style) that provide both mechanical strength for load bearing and smooth surfaces for easy assembly. The curved design distributes stresses more effectively than conical shapes while maintaining assembly simplicity through the natural flow of the curved connecting geometry.
Data Source
AI summary
A parallel spacer for a linear guideway comprises a plurality of parting portions, connecting portions and a retaining portion. Each of the parting portions is a thin member disposed between each pair of neighboring rollers. The connecting portions are employed to connect the parting portions and the retaining portion, and the retaining portion is arranged at a side of the respective rollers and located in an axial direction thereof, the retaining portion is an integral structure for connection with the respective connecting portions.