Rolling Guide Device Position Reference Holes and Protrusions
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Solution Overview
Problem
The existing rolling guide devices face challenges in accurately positioning the circulation path modules relative to the load rolling surface, leading to increased resistance and degraded motion accuracy, especially at high speeds, due to the through holes being formed before heat treatment, which affects the positional accuracy.
Innovation Solution
The rolling guide device incorporates position reference holes and positioning protrusions on the direction change pipes, allowing for precise mounting and rotation restriction, ensuring high accuracy in the positioning of the direction change paths relative to the load rolling surface, thereby facilitating smooth circulation of rolling elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the through hole is formed before heat treatment for ease of processing, then the manufacturing process is simpler, but the positional accuracy of the through hole relative to the load rolling surface deteriorates due to strain from heat treatment
Solution Approach 1:
The through hole is formed in advance before heat treatment, allowing for easier processing. The circulation path module is preliminarily positioned relative to the through hole, and then the entire assembly undergoes heat treatment together, avoiding the strain-induced positioning errors that would occur if the hole were made after heat treatment.
Solution Approach 2:
The positioning relationship between the circulation path module and the through hole is merged with the heat treatment process. Both the main body member and the circulation path module are heat-treated simultaneously while maintaining their relative positioning, ensuring that the positioning accuracy is not degraded by subsequent strain from heat treatment.
2Ease of operation
If the circulation path module is positioned relative to the main body member through the through hole, then the assembly is simpler, but the accuracy of positioning relative to the load rolling surface deteriorates
Solution Approach 1:
The through hole serves as an intermediary positioning feature that simplifies assembly. The circulation path module is positioned relative to the through hole, which itself is positioned relative to the load rolling surface. This intermediary approach maintains assembly simplicity while achieving the required positioning accuracy through the integrated heat treatment process.
3Productivity
If the rolling elements need to smoothly enter the direction change path from the load path, then the circulation is smoother and resistance is reduced, but the positioning accuracy requirement increases
Solution Approach 1:
The direction change path is preliminarily formed as an integral part of the circulation path module before assembly. The smooth transition from the load path to the direction change path is built into the module design, ensuring circulation smoothness while the integrated heat treatment maintains the precise positioning required for this smooth transition.
Data Source
AI summary
A rolling guide device is capable of facilitating smooth circulation of rolling elements in an endless circulation path, and enhancing the accuracy of motion of a moving member relative to a track member. The moving member includes: a main body member having load rolling surfaces and return paths for the rolling elements; direction change pipes incorporating inner direction change paths and having inner peripheral guide surfaces of outer direction change paths, respectively; and lid members each being mounted on the main body member and having outer peripheral guide surfaces of the outer direction change paths. The main body member has position reference holes formed therein so as to serve as position references for the direction change pipes, respectively, whereas the direction change pipes have positioning protrusions formed thereon so as to be press-fitted into the position reference holes, respectively. Further, the direction change pipes include rotation restriction protruding portions.