High-Temperature Sleeve Structure for Linear Motion Guide Lubrication
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Solution Overview
Problem
Conventional linear motion guide units fail to operate effectively in high-temperature environments due to the thermal softening of lubricant-containing polymers used in their sleeves, which compromises their lubricating performance and durability.
Innovation Solution
The use of high-temperature resistant thermoplastic resin materials, such as polyamide and polyether ether ketone (PEEK), for the sleeves, combined with grooves or slits to form lubricant pools, ensures continuous lubrication and prevents thermal deformation even at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lubricant-containing polymer is used for the sleeve, then lubrication performance is improved, but the sleeve thermally softens in high-temperature environments
Solution Approach 1:
The invention separates the lubrication function from the structural function by using two distinct components: a porous sintered resin member for lubrication and a separate metal sleeve for structural support and heat resistance. The sintered resin member is inserted into the metal sleeve, allowing each material to perform its optimal function without compromising the other.
Solution Approach 2:
The invention creates a composite structure combining sintered resin material (for lubrication) and metal material (for heat resistance and strength). This composite approach allows the sleeve assembly to simultaneously achieve excellent lubrication performance and high-temperature resistance, resolving the contradiction between these two properties.
2Ease of manufacture
If synthetic resin is used for the sleeve, then ease of manufacture is improved, but thermal deformation occurs above 80°C
Solution Approach 1:
The invention divides the sleeve into two functional parts: a metal sleeve that provides heat resistance and structural integrity, and a sintered resin member that provides lubrication. This segmentation allows each component to be manufactured using appropriate processes for its material properties.
Solution Approach 2:
The invention applies different material properties to different parts of the sleeve assembly: the metal sleeve provides thermal stability and mechanical strength where needed, while the sintered resin member provides lubrication properties in the contact zone with rolling elements.
3Reliability
If sintered resin member with porous structure is used, then lubrication is improved, but manufacturing complexity increases
Solution Approach 1:
The sintered resin member has a porous structure that automatically absorbs and retains lubricant, creating a self-lubricating system. The porous structure acts as a lubricant reservoir that continuously supplies lubrication to the rolling elements without requiring external lubrication systems or complex manufacturing processes.
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 solution enhances lubrication performance and extends the lifespan of the linear motion guide unit by maintaining lubricant supply under high-speed and high-temperature conditions, while also simplifying production and reducing costs through easier die separation during molding.
Implementation Method 1
The sleeve is formed of a thermoplastic resin whose heat distortion temperature is higher than 80° C.
Implementation Method 2
The sleeve has a space serving as a grease pool
Data Source
AI summary
A linear motion guide unit has sleeves which form return passages and are formed of a high temperature resistant resin material which allows use in a high temperature environment. In the linear motion guide unit, spaces serving as grease pools are formed in the sleeves inserted into insertion holes of a carriage. The sleeves are formed of a thermoplastic resin whose heat distortion temperature is higher than 80° C. Each sleeve is formed by combining split circular members obtained by dividing a cylindrical member into two pieces along the longitudinal direction, and a plurality of grooves which become spaces are formed on the inner circumferential surfaces of the sprit circular members through cutting orthogonal to a parting plane between the split circular members.