Telescopic Shaft Assembly with Hydrostatic Slide Blocks
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Solution Overview
Problem
The existing main shaft assemblies in machine tools suffer from significant deformation and poor pressure dispersion, leading to unsatisfactory precision and reduced service life due to inadequate rigidity and bending resistance, especially when forces are applied, which is exacerbated by the manufacturing challenges of maintaining roundness and perpendicularity.
Innovation Solution
A telescopic shaft assembly design featuring a shaft body with a convex and recessed portion, where the inner side walls of the recessed portion form obtuse angles with the bottom surface, and hydrostatic slide blocks are used to reduce friction and deformation, allowing for improved bending resistance and reduced slide block count, thereby enhancing rigidity and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a circular column shaped main shaft is used to maintain roundness, then processing precision is improved, but manufacturing cost increases significantly
Solution Approach 1:
The main shaft is divided into multiple shaft sections (first shaft section, second shaft section, third shaft section) that can be manufactured separately and then assembled. This segmentation allows each section to be manufactured with standard tolerances using conventional processes, avoiding the need for expensive high-precision machining of a single monolithic shaft, while the telescopic assembly maintains the required overall precision.
2Ease of manufacture
If a rectangular column shaped main shaft is used to simplify manufacturing, then manufacturing cost is reduced, but pressure dispersion performance deteriorates and deformation occurs
Solution Approach 1:
The shaft sections feature localized structural optimizations including recessed portions with obtuse angles and convex portions that concentrate structural strength at critical locations. These local geometric features enhance pressure dispersion and bending resistance specifically where needed, allowing the overall shaft to use simpler manufacturing processes while maintaining high strength performance at key areas.
3Device complexity
If conventional main shaft designs are used, then structural simplicity is maintained, but bending resistance performance is insufficient under applied forces
Solution Approach 1:
The shaft sections incorporate asymmetric geometric features including recessed portions with obtuse angles (greater than 90 degrees) and strategically positioned convex portions. These asymmetric shapes optimize the distribution of stresses under bending loads, providing enhanced bending resistance performance while maintaining relatively simple manufacturing processes. The asymmetric geometry allows the shaft to better resist deformation under applied forces compared to conventional symmetric designs.
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 telescopic shaft assembly demonstrates superior bending resistance and comparable thermal strain resistance to conventional designs, with reduced deformation under applied forces and cost, while maintaining applicability across various machining devices.
Implementation Method 1
hydrostatic slide blocks are used to reduce friction and deformation
Data Source
AI summary
A telescopic shaft assembly includes a seat, a shaft body disposed movably in the seat, and a plurality of slide blocks located between the shaft body and the seat. The shaft body has a convex portion and a recessed portion opposite to each other. One end of the convex portion far away from the recessed portion has a top surface. One of the plurality of slide block is disposed on the top surface. The recessed portion has two inner side wall surfaces opposite to each other and a bottom surface located between the two inner side wall surfaces. Each of the two inner side wall surfaces forms an obtuse angle with the bottom surface. Two of the rest of the plurality of slide blocks are disposed on the two inner side wall surfaces respectively.