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AIR BEARING KINEMATIC COUPLINGS

机译:空气轴承运动联轴器

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摘要

The "kinematic coupling" is a well known device used to achieve highly repeatable positioning of one machine or instrument element relative to another. Normally it consists of 3 precision balls attached to one machine element in a triangular pattern. These balls mate with 3 V-grooves in the surface of the mating element, creating ball/flat point contacts at 6 locations on each body. Friction forces at the contacts limit the repeatability and accuracy of the coupling, and can result in wear over time. This paper describes a novel coupling design where we replace the ball/flat contacts with an intermediate element consisting of a double-sided porous carbon air bearing with one planar surface and one concave spherical surface. These air bearings ride on corresponding surfaces on the two bodies to be mated, thus restricting motion along a single line in space while introducing essentially zero friction in the other directions. With 6 such elements appropriately placed, all 6-DOF of relative motion between the two bodies can be restrained.
机译:“运动耦合”是用于实现一个机器或仪器元件相对于另一机器或仪器元件的高度可重复定位的众所周知的装置。通常,它由3个精密球组成,它们以三角形的方式连接到一个机器元件上。这些球与配合元件表面上的3个V形槽相配合,从而在每个主体上的6个位置上形成球/平点接触。触点处的摩擦力限制了联轴器的可重复性和准确性,并且随着时间的流逝会导致磨损。本文介绍了一种新颖的联轴器设计,其中我们用一个包含一个具有一个平面和一个凹入球面的双面多孔碳空气轴承组成的中间元件来代替球/平面触点。这些空气轴承骑在两个要配合的物体的相应表面上,从而限制了沿空间中的一条直线的运动,同时在其他方向上引入了基本为零的摩擦力。通过适当放置6个这样的元素,可以限制两个物体之间所有6自由度的相对运动。

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