Ball Screw Nut Structure With Segmented Ball Return Path

The ball returning member is divided into multiple segments: a first ball returning member extending from the first end of the nut, a second ball returning member extending from the second end of the nut, and a connection member joining these two segments. This segmentation allows each component to be independently sized and positioned, eliminating the constraint of a single continuous pipe that forced the large-diameter portion to maintain a minimum diameter. The connection member bridges the gap between segments, enabling ball circulation without requiring a through-hole that limits the large-diameter portion dimensions.

The ball return path is reconfigured from a linear through-hole arrangement to a three-dimensional structure using the connection member that extends outward from the nut's end face. This dimensional change allows the ball circulation path to exist outside the nut's main body, freeing the large-diameter portion from the constraint of accommodating a through-hole of sufficient diameter for pipe insertion.

By segmenting the ball returning member into separate components (first ball returning member, second ball returning member, and connection member), the design allows the large-diameter portion to be minimized for weight reduction while the ball return function is achieved through the external connection member structure. This segmentation decouples the weight-critical nut body from the ball return pathway, enabling independent optimization of each component.

The connection member is configured to receive and connect the first and second ball returning members, creating a nested arrangement where the ball return path is contained within the connection member structure rather than requiring a large through-hole in the nut. This nesting allows the nut's large-diameter portion to be minimized while still providing adequate space for ball circulation through the external connection member.

The connection member serves as an intermediary structure that provides radial support to the guide members. By positioning the guide members on the outer peripheral surface of the small-diameter portion and using the connection member to bridge between the first and second ball returning members, the system creates a stable framework that prevents guide member disengagement while maintaining proper ball guidance function.

The connection member merges the functions of structural support and ball return pathway. It simultaneously provides radial support to prevent guide member disengagement and creates the circulation path for balls between the first and second ball returning members. This merging of functions eliminates the need for separate retention mechanisms while ensuring guide member reliability.