Ball screw device
The ball screw device addresses the issue of gaps between the sleeve and nut by using through holes, housing grooves, and crimped portions to ensure a secure fit, improving operational stability and smooth operation.
JP2025157733APending Publication Date: 2025-10-16NSK LTD
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Patent Information
- Application Number
- JP2024059932
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-03
- Publication Date
- 2025-10-16
AI Technical Summary
Technical Problem
In existing ball screw devices, a gap often forms between the sleeve and the nut due to the sleeve being fitted slightly larger than the nut, affecting the device's operability.
Method used
A ball screw device design featuring a nut with through holes and housing grooves, a sleeve with crimped portions, and flanges or retaining portions to prevent radial movement, ensuring a tight fit and reducing the likelihood of gaps.
Benefits of technology
The design ensures a secure fit between the sleeve and nut, preventing movement and enhancing the device's operational stability and smooth operation.
✦ Generated by Eureka AI based on patent content.
Abstract
To provide a ball screw device in which a gap is unlikely to occur between a sleeve and a nut.SOLUTION: A ball screw device comprises a screw shaft, a nut passing through the screw shaft, a plurality of balls arranged between the screw shaft and the nut, a top attached to the nut, and a cylindrical sleeve fitted to an outer peripheral surface of the nut. A direction parallel to the screw shaft is defined as an axial direction. A direction perpendicular to the axial direction is defined as a radial direction. The nut is provided with a through hole that passes in the radial direction through the nut and houses the top, and a housing groove that is recessed radially inward from the outer peripheral surface of the nut and extends in the axial direction. The sleeve is provided with a caulked part that is caulked toward the housing groove located radially inward.SELECTED DRAWING: Figure 3
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