Ball Screw Dustproof Member with Arc-Shaped Contact
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Solution Overview
Problem
Existing ball screw dustproof members are difficult to assemble and require high starting torque due to full-tooth contact and complex structures, which increase assembly challenges and friction resistance.
Innovation Solution
A ball screw with a dustproof member featuring an annular first dustproof portion and an arc-shaped second dustproof portion, providing a clearance between the dustproof inner surface and the screw's circumferential surface, and an arc-shaped contact with the outer helical groove, made of rubber or plastic to facilitate assembly and reduce starting torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dustproof lip is in full-tooth contact with the outer helical groove, then the dustproof effect is improved, but the starting torque increases and assembly becomes difficult
Solution Approach 1:
The dustproof member transitions from full-tooth contact to localized contact at the arc-shaped dustproof section. The arc-shaped second side surface contacts only a portion of the outer helical groove, creating a localized contact zone that reduces friction and starting torque while maintaining dustproof effectiveness through strategic positioning of the contact area.
Solution Approach 2:
Instead of complete tooth engagement across the entire helical groove width, the invention uses partial contact through the arc-shaped dustproof section. This partial action approach provides sufficient dustproofing by blocking the groove at critical locations without the full friction resistance of complete engagement.
2Reliability
If the dustproof inner surface is in close contact with the circumferential surface, then the dustproof effect is improved, but the starting torque increases
Solution Approach 1:
The invention introduces a controlled clearance (0.01-0.05mm) between the dustproof inner surface and the screw's circumferential surface, except at the arc-shaped dustproof section where localized contact occurs. This selective contact approach maintains dustproofing at critical interfaces while reducing overall friction and starting torque requirements.
3Reliability
If multiple dustproof lips are provided, then the dustproof effect is improved, but the structure becomes complicated and assembly becomes difficult
Solution Approach 1:
The invention merges multiple dustproof functions into a single integrated dustproof member structure. The arc-shaped second dustproof portion combines the sealing function with the structural support function, eliminating the need for separate dustproof lips while maintaining comprehensive dustproof coverage through the helical groove configuration.
Solution Approach 2:
The dustproof member is segmented into functional zones: the arc-shaped first dustproof portion for one side of the helical groove and the arc-shaped second dustproof portion for the opposite side. This segmentation allows each portion to be optimized for its specific contact zone while simplifying the overall structure compared to multiple complete lips.
Data Source
AI summary
A ball screw with a dustproof member includes: a screw, a nut and the dustproof member. The dustproof member is inserted along the axis into the annular receiving groove and sleeved onto the screw, and includes an annular first dustproof portion and an arc-shaped second dustproof portion. The annular first dustproof portion includes a dustproof hole for insertion of the screw, the dustproof hole has a dustproof inner surface defining an clearance relative to the circumferential surface of the screw, the arc-shaped second dustproof portion protrudes from the dustproof inner surface, and includes an arc-shaped dustproof section contacting the outer helical groove. Such arrangements provide a dustproof effect and prevent overstress on the screw, consequently decreasing friction resistance, thus making the assembly easier and reducing the required starting torque.