Roller Spacer Design for Linear Guideway Friction Reduction
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Solution Overview
Problem
Existing roller spacer designs for linear guideways are complex and costly to produce, with high friction resistance and instability due to surface contact and mold core requirements, leading to increased production time and cost, and reduced load capacity and rigidity.
Innovation Solution
A roller connecting and retaining device with oppositely arranged retaining portions and spacer portions, featuring a mold-releasing concave for easy injection molding, linear contact edges aligned with the axial center of rollers to prevent skewing and friction, and a hollow frame for lubricant storage, allowing for stable and smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the spacer portion is formed directly between the rollers by using the rollers as mold core, then the spacer can be integrated with the rollers, but the production technology becomes very complicated and production time increases
Solution Approach 1:
The invention divides the forming process into two independent stages: first forming the spacer portion using a mold cavity, then separately forming the rollers. This segmentation eliminates the need to use rollers as mold cores, allowing each component to be manufactured independently and assembled afterward, thereby reducing production complexity and time.
Solution Approach 2:
The invention extracts the roller-forming operation from the spacer-forming process. Instead of using rollers as mold cores during spacer formation, the rollers are manufactured separately and then assembled to the pre-formed spacer, eliminating the production bottlenecks associated with simultaneous forming.
2Ease of manufacture
If the spacer portion is formed directly between the rollers by using the rollers as mold core, then the spacer can be integrated with the rollers, but the production process becomes more complicated and production cost increases
Solution Approach 1:
The production process is segmented into independent steps: spacer formation in a mold cavity, followed by separate roller manufacturing, and finally assembly. This eliminates the complex simultaneous forming process that requires using rollers as mold cores, thereby reducing production process complexity.
Solution Approach 2:
The roller-forming operation is extracted from the spacer-forming process. The spacer is formed first using a mold cavity without requiring rollers as cores, and rollers are manufactured separately and assembled afterward, eliminating the complexity of coordinated simultaneous forming.
3Ease of manufacture
If the concave side surfaces of the spacer portion have the same radius of curvature as the rollers, then the spacer can mate with the rollers, but the spacer comes into surface contact with the rollers which substantially increases the friction resistance
Solution Approach 1:
The invention applies local quality by creating specific contact point geometry on the spacer portion. Instead of having concave surfaces with the same radius as rollers (which create surface contact), the spacer has contact points with different geometric properties that enable point or line contact, thereby reducing friction while maintaining proper mating and positioning.
4Ease of manufacture
If the protruding connecting portion is located at the center of the side contacting the rolling surface, then the spacer can connect with the rollers, but a special guiding groove must be made in the ball rolling groove which increases production cost and may interfere with the rolling motion
Solution Approach 1:
The invention extracts the connecting portion from the center location that requires guiding grooves. The connecting portions are positioned at locations that do not interfere with the rolling surface, eliminating the need for special guiding groove structures and their associated manufacturing complexity.
Solution Approach 2:
Instead of placing the connecting portion at the center of the rolling surface (which requires guiding grooves), the invention inverts the approach by positioning connecting portions at locations that naturally accommodate connection without interfering with rolling motion, thereby eliminating the need for additional guiding structures.
5Ease of manufacture
If the connecting portions are disposed at the contacting edge on both end surfaces of the rollers, then the spacer can connect with the rollers, but the connecting portions interfere with the contacting portion of the rolling surfaces which creates resistance to rolling
Solution Approach 1:
The invention applies local quality by carefully positioning connecting portions at specific locations on the spacer that do not overlap with the roller rolling surfaces. This spatial differentiation ensures that connection functions and rolling functions occur in separate zones, eliminating interference and rolling resistance.
Data Source
AI summary
A roller connecting and retaining device comprises two connecting portions, a plurality of retaining portions and spacer portions. The retaining portions are oppositely arranged in pairs and connected vertically to the connecting portions. The spacer portions are connected between the upper end and the lower end of the paired opposite retaining portions. Two contacting edges are formed at both sides of the respective spacer portions and have a linear contact with the rolling surface of the rollers, and the contacting edges of the opposite spacer portions are located correspondingly to the axial center of the rollers and are arranged at both sides of the inactive contact surface of the rollers. A mold-releasing concave is formed in each conjunction between the spacer portion and the retaining portion. Such design facilitates injection molding process, mold opening, and mass production. The contacting edge of the opposite spacer portions can prevent the problems of the rollers during rolling motion, such as slant position, friction, impact and skip.