Ball Screw Preload Piece with Elastic Shock Absorption
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Solution Overview
Problem
Conventional ball screw preload structures face challenges in controlling preload value, rigidity, and deformation, with existing solutions requiring frequent adjustment or replacement of preload components, leading to instability and increased maintenance costs.
Innovation Solution
A fixed torque preload piece is introduced, featuring adjustable steel balls and elastic members that absorb sudden pressure increases, reducing rigidity while maintaining support and preventing deformation, through a design with through holes, radial threaded holes, and adjusting screws that allow for precise preload adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the preload piece is made rigid to maintain stable preload, then the preload stability is improved, but the preload piece cannot absorb sudden pressure increases and may cause deformation
Solution Approach 1:
The preload piece incorporates a rigidity-adjusting structure that allows it to transition between rigid and flexible states. Under normal operating conditions, the structure maintains rigidity to ensure preload stability. When sudden pressure increases occur, the structure can deform elastically to absorb the shock, preventing damage to the ball screw system.
2Strength
If the preload piece thickness is increased to enhance rigidity, then the deformation resistance is improved, but the preload value becomes difficult to control and adjustment becomes troublesome
Solution Approach 1:
The preload piece is segmented into multiple functional zones with different thicknesses and rigidity characteristics. The rigidity-adjusting structure is divided into distinct segments that can independently respond to loading conditions, allowing for controlled deformation while maintaining overall structural integrity and adjustable preload characteristics.
Solution Approach 2:
The structure incorporates variable rigidity parameters through its geometric design, where different regions have different moment of inertia values. This allows the preload piece to exhibit location-dependent rigidity, with some regions being more flexible than others, enabling both deformation absorption and controlled preload adjustment.
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 solution effectively absorbs sudden pressure increases, reduces preload component wear, and allows for adjustable preload settings, enhancing the stability and longevity of ball screw systems while minimizing deformation and maintenance costs.
Implementation Method 1
elastic members that absorb sudden pressure increases, reducing rigidity while maintaining support and preventing deformation
Data Source
AI summary
A fixed torque preload piece is positioned between two nuts of a ball screw, the preload piece is formed with through hole located in an axial direction of the two nuts for receiving at least two steel balls. Two terminal openings of each of the through holes are defined in the surfaces of the preload piece facing the two opposite nuts. Three radial threaded holes are formed in the outer periphery of the preload piece, and the threaded holes are vertical to and in communication with the through holes. An adjusting member, an elastic member and an adjusting screw are received sequentially in the respective threaded holes. The steel balls in the through holes are pushed against the two nuts by the arc-shaped abutting surface of the adjusting member, the pushing of the steel balls can produce an adjustable preload, and can absorb the sudden increase of the pressure effectively, thus obtaining the objective of the present invention of outputting torque stably.