Linear Motion Guide End Seal With Metallic Core
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Solution Overview
Problem
Conventional linear motion guide units experience unsatisfactory air-tightness and lubricant leakage due to deformation of elastic lips, leading to maintenance issues and reduced sliding performance, especially under high-speed conditions.
Innovation Solution
The design incorporates end seals with outward and inward lips merged at their proximal ends and supported by a metallic core, which biases the lips to avoid interference with the end cap and resist sliding resistance, ensuring the lips maintain contact with the guide rail to prevent lubricant leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the elastic member is made to extend long from the metallic core to the leading edge to enhance sealing contact, then the sealing performance is improved, but the elastic member is liable to bend or warp largely causing deformation and lubricant leakage
Solution Approach 1:
The end seal combines a metallic core (rigid) with an elastic member (flexible) to create a composite structure. The metallic core provides structural support and resistance to bending/warping, while the elastic member maintains sealing contact through its elasticity. This composite construction resolves the contradiction by allowing long extension for sealing without sacrificing shape stability.
Solution Approach 2:
The metallic core acts as an intermediary between the elastic member and the external forces. It transfers and distributes the sliding resistance forces along its length, preventing concentrated stresses that would cause the elastic member to bend or warp. The core mediates between the need for long elastic extension and the need for shape stability.
2Reliability
If the inward lip is pressed down against the guide rail surface to improve sealing, then the air-tightness is enhanced, but the lubricant leaks out through the deformed lip
Solution Approach 1:
The composite structure of metallic core and elastic member allows the inward lip to be pressed against the guide rail with controlled force. The metallic core distributes this force evenly, preventing excessive localized deformation that would cause lubricant leakage, while maintaining sufficient contact pressure for air-tight sealing.
Solution Approach 2:
The invention changes the mechanical parameters of the sealing system by introducing the metallic core with specific stiffness properties. This alters the force-displacement characteristics of the lip, enabling it to maintain optimal contact pressure for sealing without exceeding the deformation threshold that would cause lubricant leakage.
3Stability of the object's composition
If the outward lip is born against the metallic core on the center line to prevent deformation, then the shape stability is improved, but the lip cannot adequately exclude foreign matter
Solution Approach 1:
The elastic member extends beyond the metallic core to form the outward lip, combining the shape stability provided by the core with the foreign matter exclusion capability provided by the extended elastic portion. The elastic member can deflect to intercept foreign matter while the core maintains overall lip geometry.
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 enhances lubricant retention, achieving long-lasting maintenance-free operation and improved sliding performance by preventing lubricant leakage and maintaining effective sealing even under high-speed conditions.
Implementation Method 1
the first lip of the lip-type seal is made raised above a major portion of the seal to undergo elastic deformation after the protector has been fastened to the lip-type seal
Implementation Method 2
a metallic core 8P serving as a skeleton of the end seal 6P to reinforce or bear the elastic member 7P
Implementation Method 3
an outside lip 21P extending outward of the slider 2P to make sliding engagement with a top surface 10 of the guide rail 1
Data Source
AI summary
A lip portion of an end seal is born against a metallic core to make no interference against an end cap. The metallic core controls deformation of the lip portion to improve the close engagement of the lip portion with a guide rail. The lip portion is composed of an outside lip extending outwards and an inside lip extending inwards of the slider. A root portion where the inside and outside lips are merged together is secured to the metallic core in such a relation that the metallic core bears stress exerted on respective center lines of the outside and the inside lips. The metallic core is composed of a mounting portion having a mounting surface, a bent portion extending widthwise of the slider and biased or deflected more outward of the slider to prevent the lip portion from make any interference with the end cap.