Ball Screw Deflecting Device Strength and Durability
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Solution Overview
Problem
Conventional deflecting devices for ball screw systems are costly to manufacture and prone to damage due to precise formation requirements and high-speed ball bearing interactions, leading to reduced strength and working life.
Innovation Solution
A deflecting device with two deflecting members anchored between side surfaces of a nut member, featuring a ball deflecting channel that communicates with helical grooves and an axial ball return channel, secured with fasteners and aligned with helical grooves to form an endless ball guiding passage, enhancing strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the deflecting member is precisely formed with projection, rectilinear part and curved part, then the ball bearing members can be guided smoothly, but the manufacturing procedures and costs will be greatly increased
Solution Approach 1:
The deflecting member is divided into multiple components: a body portion with a through-hole, and a separate reinforcing portion that fits into the through-hole. This segmentation allows each part to be manufactured independently using simpler processes, then assembled together to achieve the desired smooth guidance function without requiring complex single-piece forming operations.
Solution Approach 2:
The body portion and reinforcing portion are combined through interference fit or mechanical fastening to create a unified deflecting member structure. This merging provides the smooth guidance function while maintaining manufacturing simplicity, as each component can be produced separately with standard machining or molding processes.
2Ease of operation
If the deflecting member is precisely formed with complex geometry, then the ball bearing members can be guided smoothly, but the deflecting member may have a good chance to be damaged by the ball bearing members when moved at great speed
Solution Approach 1:
By separating the deflecting member into a body portion and a reinforcing portion, the structure can be optimized for both guidance smoothness and damage resistance. The reinforcing portion specifically addresses the weakness of the body portion without complicating the overall geometry that guides the balls.
Solution Approach 2:
The deflecting member uses a composite structure combining the body portion (providing guidance geometry) and the reinforcing portion (providing structural strength). This composite approach allows the structure to withstand high-speed ball bearing interactions while maintaining smooth guidance, effectively resolving the contradiction between operational smoothness and damage resistance.
3Ease of operation
If the deflecting element is precisely formed with multiple parts and open deflecting channels, then the ball bearing members can be guided smoothly, but the manufacturing procedures and costs will be greatly increased
Solution Approach 1:
The deflecting element is segmented into a body portion containing the deflecting channel and a separate reinforcing portion. This allows the deflecting channel to be formed in the body portion using standard machining or molding, while the reinforcing portion is separately manufactured and then assembled, significantly simplifying the overall manufacturing process compared to forming a complex single-piece structure.
Solution Approach 2:
The reinforcing portion is designed to fit into the through-hole of the body portion, where it self-reinforces the structure without requiring additional complex assembly operations. The interference fit or mechanical fastening allows the components to self-align and secure themselves, reducing manufacturing complexity.
Data Source
AI summary
A ball screw device includes a screw engaged into a nut member for forming an endless ball guiding passage between the nut member and the screw and for receiving a number of ball bearing members, the nut member includes two orifices aligned with the helical grooves of the nut member and an axial ball return channel communicating with the orifices of the nut member, a deflecting device includes two deflecting members engaged into the orifices of the nut member and each having a ball deflecting channel communicating with the helical grooves and the axial ball return channel of the nut member for increasing the strength and the working life of the deflecting device.