Ball Screw Split Body Positioning via Shoulder Sandwich
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Solution Overview
Problem
The existing ball screw device has a low positioning restriction property, leading to potential deviation of split bodies under ball loads, which can cause clogging and inefficient scooping of balls from the ball load rolling path.
Innovation Solution
The ball screw device incorporates a rolling body circulation part formed by combining a first split body and a second split body, where the second split body has leg sections to scoop up and return balls, connecting sections between the split bodies, and shoulder sections to sandwich the first split body, enhancing the positioning restriction property.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ball circulation part is formed by simply combining a first split body and a second split body without additional positioning structures, then the device complexity is reduced and ease of manufacture is improved, but the positioning restriction property deteriorates causing deviation of split bodies under ball loads
Solution Approach 1:
The ball circulation part is divided into a first split body and a second split body that can be assembled separately. The second split body includes leg sections, connecting sections, and shoulder sections that can be manufactured and positioned independently, then combined with the first split body to form the complete circulation part.
Solution Approach 2:
The shoulder sections of the second split body act as intermediary positioning elements that engage with the first split body. These shoulder sections provide intermediate positioning support that prevents deviation of the split bodies under ball loads while maintaining the segmented structure.
2Reliability
If the positioning restriction property is low, then the ease of operation is improved for assembly, but the reliability deteriorates causing clogging of balls and inefficient scooping from the ball load rolling path
Solution Approach 1:
The second split body incorporates shoulder sections at specific locations where positioning is critical. These localized structural features provide enhanced positioning restriction property at key interfaces without complicating the overall assembly process, ensuring reliable ball scooping at the leg sections.
Data Source
AI summary
A ball screw device includes a ball circulation part having a ball circulation path. The ball circulation part is formed by combining a first split body and a second split body. The first split body has a fixing section fixed to an outer surface of a nut member. The second split body has a pair of leg sections configured to scoop up balls moving along a ball load rolling path and return the balls to the ball load rolling path, a connecting section configured to connect the pair of leg sections and disposed between the first split body and the nut member, and a pair of shoulder sections facing side surfaces of the first split body in two directions so as to sandwich the first split body between the pair of shoulder sections.