Patent ID: 8495820
Filing Date: 2013-07-30
Classification: G01D

Abstract:
1. An angle-measuring device, comprising: a first component group including a connecting device and a scanning unit; a second component group including a shaft, a code disk attached to the shaft, and a flow channel having a directional component parallel to an axis; and a bearing having a bearing gap, the component groups rotatable relative to each other about the axis by the bearing; wherein the code disk is scannable by the scanning unit to determine an angular position of the two component groups relative to each other; wherein the connecting device is adapted to be applied with a negative pressure so that a fluid surrounding the angle-measuring device flows through the angle-measuring device to remove contaminants by suction; and wherein at the applied negative pressure, a first mass flow of the fluid which flows through the flow channel is greater than a second mass flow which flows through the bearing gap.