Linear Motion Guide End Cap Lubrication Design
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Solution Overview
Problem
Existing linear motion guide units face challenges in maintaining adequate lubrication for cylindrical rollers over a long-lasting period, leading to potential metal-to-metal contact and reduced durability, especially in miniaturized designs where space constraints limit the size of lubricant reservoirs and mechanical strength is compromised.
Innovation Solution
A linear motion guide unit design featuring an end cap with a concavity on its inward surface, accommodating a porous compact impregnated with lubricant, which is exposed to turnaround passages through openings in spacer parts, ensuring ample lubricant supply and maintenance-free operation by allowing the rollers to come into contact with the lubricant-coated surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous compact impregnated with lubricant is placed in a concavity on the outward end surface of the end cap, then lubrication for the rolling elements is improved, but the mechanical strength of the end cap is compromised due to space occupied by grooves for binding strips
Solution Approach 1:
The patent inverts the conventional placement location of the porous compact from the outward end surface to the inward end surface of the end cap. This inversion resolves the contradiction by relocating the lubricant reservoir to a space that would otherwise be unused, thereby maintaining mechanical strength while ensuring reliable lubrication.
Solution Approach 2:
The patent utilizes the inward end surface dimension of the end cap, which is perpendicular to the outward end surface, to place the porous compact. This dimensional relocation allows the lubrication system to coexist with the binding strip grooves without compromising structural integrity.
2Quantity of substance
If the porous compact is exposed to the turnaround passage through openings in spacer parts, then lubricant supply to rollers is enhanced, but device complexity increases due to additional spacer parts with openings
Solution Approach 1:
The spacer parts serve multiple functions: they maintain the structural integrity of the turnaround passage and simultaneously provide openings that expose the porous compact to the rollers. This multi-functionality enhances lubricant supply without proportionally increasing device complexity.
Solution Approach 2:
The spacer parts with openings automatically expose the porous compact to the rollers during normal operation, allowing the lubrication system to self-regulate without additional control mechanisms. The structure itself facilitates lubricant distribution.
3Volume of moving object
If miniaturized linear motion guide unit is designed with four-row array of rollers, then space efficiency is improved, but adequate lubrication becomes difficult to maintain due to limited space for lubricant reservoir
Solution Approach 1:
By inverting the placement location of the porous compact to the inward end surface, the patent effectively doubles the available space for lubricant reservoir in miniaturized designs, allowing adequate lubrication for four-row roller arrays while maintaining compact overall dimensions.
Solution Approach 2:
The patent exploits the inward end surface dimension, which is previously underutilized in miniaturized designs, to accommodate the porous compact. This dimensional utilization provides sufficient lubricant capacity without increasing the overall volume of the moving object.
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 design provides steady and sustainable lubrication to the rollers, enhancing their service life and mechanical strength while minimizing lubricant consumption, even in compact configurations, and allows for cost-effective lubricant replenishment by using a single end cap for a four-row array of rollers.
Implementation Method 1
a porous compact impregnated with lubricant fits into the concavity... The rolling elements rolling through the turnaround passages, as coming into rolling-contact with at least one of the parts of the porous compact exposed out of the openings, are applied with the lubricant
Data Source
AI summary
Lubrication for rolling elements are made in a turnaround passage in an end cap to ensure proper and steady lubrication by the lubrication system simple in construction, with accompanying sustainable maintenance-free condition for lubrication. The end cap has an inward end surface facing directly towards the end surface of the carriage of the slider and having a concavity which sinks below the inward end surface and has openings communicating with the turnaround passages. A porous compact impregnated with lubricant is fitted into the concavity in a fashion exposed in part to the turnaround passage through the openings so that the rolling elements rolling through the turnaround passages, as coming into rolling-contact with the parts of the porous compact exposed out of the openings, are applied with the lubricant.