Ball Screw Guide Member Curved Pathways High Speed Stability
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Solution Overview
Problem
Conventional ball screw devices face challenges in effectively guiding balls or bearing members at high rotational speeds due to limitations in ball return channels and passages, leading to inefficient movement between the ball nut and screw shaft.
Innovation Solution
A ball screw device with an inserted ball guide member featuring two curved pathways and bars that form separated endless ball rolling passages, allowing for stable and smooth guidance of bearing members between the ball nut and screw shaft, enhancing rotational movement at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single ball return passage is provided in the ball nut, then the device complexity is reduced, but the quantity of bearing members that can be engaged is limited
Solution Approach 1:
The invention divides the single ball return passage into multiple separate ball return passages (first and second ball return passages) within the ball nut. This segmentation allows multiple groups of bearing members to be engaged simultaneously, increasing the load capacity and quantity of bearing members without significantly increasing overall device complexity.
2Reliability
If ball return channels are deeply formed in the plastic insert, then the balls can be effectively guided, but manufacturing and machining become more difficult
Solution Approach 1:
The invention introduces a separate ball guide member as an intermediary component that works in conjunction with the plastic insert. The ball guide member includes curved surfaces that guide the balls from the ball return channels into the ball nut, allowing the plastic insert to have shallower, easier-to-manufacture channels while still achieving effective ball guidance through the combined action of both components.
3Productivity
If the ball nut rotates at high speeds, then the productivity increases, but the stability of ball guidance deteriorates
Solution Approach 1:
The invention employs curved surfaces in the ball guide member and curved pathways in the ball nut to guide the bearing members. These curved geometries are specifically designed to maintain stable ball guidance during high-speed rotation, allowing the ball nut to rotate at high speeds while keeping the bearing members properly positioned and guided throughout the rotation cycle.
Data Source
AI summary
A ball screw device includes a screw shaft threaded with a ball nut which has two channels and an opening, a guide member is engaged into the opening of the ball nut and has two curved pathways communicating with the channels to form two separated endless ball rolling passages in the ball nut, and two groups of bearing members are engaged in the two separated endless ball rolling passages for facilitating a movement of the ball nut relative to the screw shaft. The guide member includes two bars for enclosing the curved pathways of the guide member, and the bars each have a curved recess for forming the curved pathways of the guide member and for allowing the guide member to be easily manufactured.