Ball Screw Assembly Nozzle Uniform Gap Design
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Solution Overview
Problem
In the assembly of ball screws, existing devices face issues with balls getting stuck between the ball guide and the nut's inner circumference, leading to potential assembly failures due to interference between the internal-deflector member and the ball guide, which can hinder the swing motion of the nut and result in improper ball placement.
Innovation Solution
The assembly device features a ball-embedding nozzle with a spiral screw groove matching the screw shaft's groove, a linear and inclined ball supply path, and a nut receiving mechanism that allows for uniform gap formation between the nut and the nozzle, ensuring balls are supplied into the correct circulation line without interference, and a ball falling prevention member to stabilize the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a ball guide is used to supply balls into the nut, then ball supply is enabled, but balls may get stuck between the ball guide and the nut's inner circumference
Solution Approach 1:
The patent extracts the problematic ball guide component and replaces it with a ball supply mechanism that feeds balls directly into the circulation line without contact with the nut's inner circumference, eliminating the sticking issue while maintaining ball supply function
Solution Approach 2:
The patent introduces a ball supply mechanism as an intermediary component that delivers balls to the circulation line through a controlled path, preventing direct contact between balls and the nut's inner circumference that causes sticking
2Reliability
If the gap between the ball guide and nut inner circumference is increased to prevent ball sticking, then ball supply reliability improves, but the internal-deflector member and ball guide may interfere with each other
Solution Approach 1:
The patent removes the ball guide component entirely and replaces it with a ball supply mechanism that positions balls directly into the circulation line, eliminating interference with the internal-deflector member while ensuring reliable ball supply
Solution Approach 2:
The patent changes the spatial arrangement by delivering balls from a different dimensional approach - feeding balls along the axial direction into the circulation line opening rather than from the radial direction, avoiding interference with the internal-deflector member
3Ease of manufacture
If the ball guide structure is simplified to reduce complexity, then manufacturing ease improves, but ball placement precision may deteriorate
Solution Approach 1:
The patent employs a ball supply mechanism that utilizes the natural rolling motion of balls under gravity and the geometric configuration of the circulation line to achieve precise ball placement automatically, without requiring complex guiding structures or additional positioning components
Solution Approach 2:
The patent leverages the spherical shape of balls and the curved geometry of the circulation line to guide balls into the correct position through natural rolling motion, achieving precise ball placement without complex mechanical guides
Data Source
AI summary
According to the present invention, a nut is in a state of being received by nut receiving means. In this state, a ball-embedding nozzle is fitted into the nut so that a gap between the inner circumference of the nut and the outer circumference of the ball-embedding nozzle is uniformly formed around the entire circumference thereof. Balls are supplied into a screw groove of the nut via a ball supply path in the ball-embedding nozzle.