Movable Circulation Member for Nut Recess Alignment
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Solution Overview
Problem
The existing screw device faces challenges in accurately aligning the recess on the nut's end surface with the helical loaded rolling element rolling groove, leading to inhibited smooth circulation of rolling elements due to potential misalignment or depth deviations, requiring high-accuracy processing.
Innovation Solution
A screw device design that includes a movable circulation member within a recess on the nut's axial end surface, allowing for positional adjustment based on rolling element movement, with a lid member to secure the circulation member, ensuring smooth circulation even if the recess is displaced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the recess is processed by a milling cutter from the end surface side of the nut, then the recess can be formed to accommodate the circulation member, but it becomes difficult to accurately align the position of the loaded rolling element rolling groove and the position of the recess
Solution Approach 1:
The helical loaded rolling element rolling groove is processed on the nut before the recess is formed. This preliminary action allows the rolling groove to be accurately positioned first, and then the recess can be formed with an allowance for accuracy, ensuring proper alignment without requiring extremely high precision in the recess processing step.
Solution Approach 2:
The circulation member acts as an intermediary element that links the loaded rolling element rolling groove and the communicating hole. By allowing the circulation member to be accommodated in the recess with some tolerance, it mediates the connection between the rolling groove and the communicating hole, ensuring smooth circulation even with minor misalignments.
2Reliability
If high accuracy processing is applied to the recess to ensure proper alignment, then the rolling elements can circulate smoothly, but the manufacturing complexity and cost increase
Solution Approach 1:
The design changes the tolerance parameters of the recess to provide an allowance for accuracy. Instead of requiring tight tolerances, the recess is designed with larger tolerances that still ensure proper function, thereby reducing manufacturing complexity while maintaining reliability of the rolling element circulation.
3Manufacturing precision
If the recess depth deviates from the correct depth, then the circulation member cannot properly link the rolling groove and communicating hole, but processing with high accuracy increases manufacturing difficulty
Solution Approach 1:
The rolling groove is processed first as a preliminary action, establishing a reference that allows the subsequent recess to be formed with an allowance for depth variations. This sequence enables easier manufacturing while ensuring the circulation member can still properly link the rolling groove and communicating hole.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The movable circulation member ensures accurate positioning and smooth circulation of rolling elements, providing an allowance for the accuracy of the recess and preventing misalignment issues.
Implementation Method 1
The screw device uses the rolling motion of the rolling element and accordingly has a feature that the light movement of the screw shaft and the nut can be obtained
Data Source
AI summary
A disclosed screw device provides an allowance for the accuracy of a recess in an end surface of a nut. A nut has a communicating hole communicating in an axial direction, and is provided at an axial end surface of the nut with a recess communicating with the communicating hole. A circulation member including a turn-around path is placed in the recess. When the circulation member is placed in the recess, the turn-around path of the circulation member is linked to a loaded rolling element rolling groove and the communicating hole of the nut to form a circulation path of a rolling element. A clearance between the circulation member and a wall surface of the recess permits the circulation member to move. The circulation member placed in the recess is not fixed in the recess, and is covered with a lid member to be attached to the nut.