Draw Tube Linkage Mechanism for Low-Vibration Spindle Actuation
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Solution Overview
Problem
Existing draw tube drive mechanisms in machine tools face challenges with vibration, noise, and heat generation due to tilting of components during rotation, and they often require more installation space and can be affected by production errors and clearances between moving parts.
Innovation Solution
A draw tube drive mechanism comprising a draw tube, driver, first link, second link, and third link, where the links are connected via pins that form specific geometric relationships to ensure perpendicular movement and prevent tilting of the third link, reducing vibration, noise, and heat, while allowing for compact installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional draw tube drive mechanism is used, then the draw tube can be moved, but vibration, noise, and heat are generated due to tilting of components during rotation
Solution Approach 1:
The drive mechanism is divided into multiple separate links (first link, second link, third link) connected by pins, allowing each component to maintain its own stability while working together as a system. This segmentation prevents tilting of individual components during rotation.
Solution Approach 2:
The mechanism uses a specific geometric arrangement where pins extend along a direction substantially perpendicular to both the first axis and the moving direction. This dimensional configuration ensures that forces are transmitted without causing tilting moments, eliminating vibration, noise, and heat generation.
2Productivity
If existing draw tube drive mechanisms are installed, then the draw tube can be actuated, but more installation space is required
Solution Approach 1:
The multiple links are arranged in a compact, nested configuration where the first link, second link, and third link are positioned close to each other in space. This nesting allows the mechanism to fit within a smaller overall envelope while maintaining full actuation capability.
Solution Approach 2:
By arranging pins and links in a three-dimensional configuration with specific geometric relationships, the mechanism achieves compactness in one dimension while maintaining functionality. The pins extending perpendicular to both the first axis and moving direction allow efficient space utilization.
3Ease of operation
If conventional linkages are used, then movement can be transmitted, but production errors and clearances between moving parts cause excessive looseness
Solution Approach 1:
The specific geometric arrangement of pins extending perpendicular to both the first axis and moving direction creates a kinematic structure that minimizes the impact of clearances and manufacturing tolerances. This dimensional configuration ensures that small errors do not translate into excessive looseness in the draw tube movement.
Solution Approach 2:
Instead of trying to eliminate clearances through tight tolerances, the mechanism is designed to accommodate normal manufacturing clearances through its geometric configuration. The linkage arrangement converts potential sources of looseness into stable force transmission paths.
Data Source
AI summary
A draw tube drive mechanism includes a draw tube movable along a first axis of a rotation shaft, a moving member movable substantially perpendicularly to the first axis, a first link rotatably connected to the moving member via a first pin, a third link rotatably connected to the first link via a third pin to receive a force from the moving member and transmit the force to the draw tube, and a second link rotatably connected to the first link via a second pin and rotatably connected to the support via the fourth pin. The second pin is provided between the first and third pins. The first to third pins are arranged substantially on a straight line. Each of a distance between the first and second pins and a distance between the second and third pins is substantially equal to a distance between the second and fourth pins.