Curvilinear Rolling Guide End Cap Elastic Deformation and Sealing
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Solution Overview
Problem
Conventional curvilinear rolling guide units face challenges in achieving a well-balanced and reduced-size slider structure that can accommodate end caps of the same design specifications, especially when the curvature of the guide rail or the length of the slider changes, and they struggle with lubricant leakage during lubrication.
Innovation Solution
The solution involves forming a slit in the end cap to allow elastic deformation for straddling the guide rail, using a lubrication plug to prevent lubricant leakage, and designing the end cap with a lubrication passage that includes a positioning protrusion for precise placement, enabling the slider to be mounted and lubricated efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a slit is formed in the end cap to allow elastic deformation for straddling the guide rail, then the ease of assembly is improved, but lubricant leakage occurs through the slit
Solution Approach 1:
A lubrication plug is introduced as an intermediary component that fits into the lubrication hole of the end cap. The plug has a through-hole that serves as a controlled passage for lubricant, replacing the uncontrolled slit opening. This mediator blocks the harmful leakage path while preserving the elastic deformation capability of the end cap for assembly.
Solution Approach 2:
The end cap is designed with non-uniform wall thickness: a thin-walled portion above the lubrication hole allows elastic deformation for straddling assembly, while other portions maintain sufficient thickness for structural integrity. The lubrication plug further refines local quality by providing a controlled aperture in the lubrication hole area, allowing lubricant flow only through the intended path and not through the slit.
2Shape
If the slider structure is reduced in size and optimized for balance, then the slider performance is improved, but accommodating end caps with same design specifications becomes difficult when curvature or length changes
Solution Approach 1:
The end cap is designed with a universal structure that can accommodate different guide rail curvatures and slider lengths. The standardized end cap design with the lubrication hole and slit configuration works across multiple applications. The elastic deformation capability through the slit allows the same end cap design to adapt to various curvature requirements, while the lubrication plug ensures consistent lubricant delivery regardless of the specific application geometry.
3Volume of moving object
If the end cap width between scooping portions is narrower than the guide rail width, then the slider structure is compact, but the end cap cannot straddle the guide rail for assembly
Solution Approach 1:
The end cap incorporates a thin-walled portion above the lubrication hole that provides flexibility. This thin-walled region allows the end cap to elastically deform and expand its width between the scooping portions temporarily, enabling it to straddle the guide rail during assembly. Once positioned, the end cap returns to its compact form, maintaining the space-efficient design while achieving the necessary assembly capability.
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
This configuration allows for easy assembly and disassembly of the slider on the guide rail, prevents lubricant leakage, and facilitates the use of the same end cap design across varying slider lengths and curvatures, simplifying component management and ensuring smooth lubrication.
Implementation Method 1
the end cap has a thin-walled portion located above a lubrication hole, and the width between the wing portions can be expanded by elastically deforming the end cap at the thin-walled portion by external force
Implementation Method 2
a lubrication plug which closes the slit and has a through-hole forming a lubrication passage
Implementation Method 3
the lubrication plug has a positioning protrusion which engages with the end cap
Implementation Method 4
a slider which straddles the guide rail and slides thereon via rolling elements
Data Source
AI summary
A curvilinear rolling guide unit allows a slider to readily straddle an endless guide rail and can prevent leakage of lubricant from a lubrication hole formed in each end cap. Each end cap is composed of an end cap body and a spacer. The end cap body has a lubrication hole, a lubrication groove, a slit which are formed in an upper portion thereof. The lubrication groove establish communication between the lubrication hole and turnaround passages. The slit extends from the lubrication hole to the under surface of the upper portion. A lubrication plug is fitted into the lubrication hole of the end cap body, closes the slit, and has a hole formed therein and serving as a lubrication passage communicating with the lubrication groove.