Ball Screw Return Structure With Twisted Guiding Grooves
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Solution Overview
Problem
Conventional ball screws experience improper deformation and increased friction due to the design of linking portions within the return assemblies, leading to potential rupture and unsmooth circulation of the rolling assembly, along with noise and damage.
Innovation Solution
The ball screw design incorporates guiding grooves that twist at specific angles to guide linking portions in a bendable direction, avoiding excessive deformation and ensuring even loading, thus preventing improper bending and collisions, and forming a complete recirculation path for smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If guiding grooves are designed along arcs defined by smallest and biggest radii of return portion, then the circulation path is defined for endless circulation, but the linking portions are subjected to improper stretching and extrusion forces causing rupture
Solution Approach 1:
The guiding grooves are designed with curved paths that follow the spherical geometry of the return portion, allowing linking portions to bend smoothly along arcs defined by intermediate radii rather than extreme radii. This curved path design distributes bending forces evenly and prevents concentration of stress at sharp corners, thereby maintaining both circulation stability and linking portion strength.
Solution Approach 2:
The invention changes the geometric parameters of the guiding grooves by defining them along arcs with intermediate radii rather than the smallest or biggest radii of the return portion. This parameter modification ensures that linking portions experience balanced bending forces in both directions, preventing the improper stretching and extrusion that lead to rupture while maintaining continuous circulation.
2Productivity
If linking portions slide along guiding grooves at right-angled return portion, then circulation is achieved, but high speed sliding causes vibration and noise
Solution Approach 1:
The guiding grooves are designed with smooth curved transitions instead of right-angled paths. The curved grooves allow linking portions to follow a gradual arc-shaped trajectory through the return portion, reducing sudden changes in direction and sliding speed. This eliminates the high-speed sliding impacts that cause vibration and noise while maintaining efficient circulation.
3Stability of the object's composition
If guiding grooves are positioned at arcs defined by extreme radii, then circulation path is established, but rolling elements collide with inner surface of return assembly
Solution Approach 1:
The invention modifies the positional parameters of the guiding grooves by locating them along arcs defined by intermediate radii rather than the extreme smallest or biggest radii of the return portion. This parameter change creates adequate clearance between the rolling elements and the inner surface of the return assembly, preventing collisions while maintaining a stable and well-defined circulation path.
Data Source
AI summary
A ball screw comprises a screw, a nut, two return assemblies and a rolling assembly. The two return assemblies are disposed in two ends of the nut, and each of the return assemblies is defined with a return passage provided with two guiding grooves at two sides thereof for guiding the linking portions of the rolling assembly. The guiding grooves twist an angle of about 90 degrees within the return portion of each of the return assemblies to prevent the linking portions from being stretched or extruded improperly to reduce the deformation to the lowest, thus effectively extending the service life of the rolling assembly.