Internal Circulation Ball Screw Radial Channel Design
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Solution Overview
Problem
Conventional internal circulation ball screws face damage issues due to thin walls in circulation channels, necessitating cross-thread designs that lead to ineffective threads and increased nut length, especially when used with shorter strokes.
Innovation Solution
The internal circulation ball screw design features a threaded shaft with first and second threaded grooves, a receiving space with specific fractures, and a circulation member with curved sections arranged at a predetermined included angle, allowing rolling members to move without the need for cross-thread design, thus maintaining uniform channel walls and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cross-thread design is applied to prevent circulation member damage, then the circulation member durability is improved, but the nut length increases and ineffective threads increase
Solution Approach 1:
The circulation channels are arranged in a radial pattern around the central axis of the nut, utilizing the radial dimension to distribute channels evenly. This radial arrangement allows the circulation member to maintain sufficient wall thickness without requiring cross-thread design, thereby preventing the nut length from increasing while still ensuring durability.
2Adaptability or versatility
If pitch between circulation channels is reduced to accommodate shorter stroke, then the adaptability to shorter stroke is improved, but the channel wall thickness decreases and damage risk increases
Solution Approach 1:
By transitioning from a linear arrangement to a radial arrangement of circulation channels around the central axis, the patent充分利用 the radial dimension to accommodate multiple channels within the available space. This allows for reduced pitch between channels to adapt to shorter strokes while maintaining sufficient wall thickness through the radial distribution geometry.
Solution Approach 2:
The patent changes the geometric parameters of the circulation channel arrangement by using radial positioning with specific angular spacing (e.g., 90 degrees between adjacent channels). This parameter change allows the channels to be closely spaced radially while maintaining adequate wall thickness, enabling adaptation to shorter stroke applications without compromising strength.
Data Source
AI summary
An internal circulation ball screw includes a threaded shaft, a nut having a receiving space, a circulation member mounted to the receiving space and having a first circulation groove and a second circulation groove, and a plurality of rolling members running between the threaded shaft and the nut. The first circulation groove defines a first front section, a first rear section, and a first curved section communicating with the first front section and the first rear section separately. The second circulation groove defines a second front section, a second rear section, and a second curved section communicating with the second front section and the second rear section separately. The first and second curved sections define a predetermined included angle with respect to the threaded shaft radially. Therefore, the wall between the circulation channels is uniform to enhance the durability of the ball screw.