Screw Apparatus Seal Ring Positioning via Cap Protrusions
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Solution Overview
Problem
The existing screw apparatus with a seal ring requires multiple components and sleeves for positioning, making assembly complex and difficult.
Innovation Solution
A screw apparatus design that uses a cap with protrusions and indentations to position the seal ring circumferentially and axially, eliminating the need for sleeves and reducing the number of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sleeves are used to position the seal ring circumferentially, then positioning accuracy is improved, but the number of components increases and assembly difficulty increases
Solution Approach 1:
The cap integrates both the positioning function (via protrusions fitting into indentations on the seal ring) and the fastening function (via threaded holes for fastening members) into a single component. This eliminates the need for separate positioning sleeves, reducing the total component count while maintaining precise circumferential positioning of the seal ring.
2Reliability
If multiple components including sleeves are used for seal ring positioning, then positioning reliability is improved, but assembly ease deteriorates
Solution Approach 1:
The cap combines positioning protrusions and fastening threads in a single integrated structure, allowing the seal ring to be positioned and secured in one assembly operation rather than requiring separate steps for positioning sleeves and fastening, thereby improving assembly ease while maintaining reliability
Solution Approach 2:
The cap acts as an intermediary component that provides both positioning (through protrusions fitting into seal ring indentations) and fastening (through threaded holes for fastening members) functions, simplifying the assembly process by eliminating the need for separate positioning sleeves
Data Source
AI summary
A screw apparatus with a seal ring is provided which has a reduced number of components and is easy to be assembled. The screw apparatus includes a screw shaft, a nut that includes a through-hole penetrated by the screw shaft and threadedly engages with the screw shaft via a rolling element, seal rings that include holes fitting the shape of a cross-section of the screw shaft, the cross-section being perpendicular to an axis thereof, and prevent the entry of dust into the inside of the nut, and/or prevent the leaking of lubricant in the nut, and a cap attached to the nut, the cap including protrusions fitted into indentations of the seal rings to effect positioning of the seal rings in a circumferential direction, the cap including a step in contact with the seal rings to effect positioning of the seal rings in an axial direction.