Angle-measuring device
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United States of America Patent
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Jul 30, 2013
Grant Date -
Jul 14, 2011
app pub date -
Jul 14, 2009
filing date -
Sep 20, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
An angle-measuring device including a first component group and a second component group, the component groups being disposed in a manner allowing rotation relative to each other by a bearing. The first component group includes a housing having a connecting device, as well as a scanning unit. The second component group includes a shaft to which a code disk is attached, and a flow channel having a directional component parallel to the axis. The angle-measuring device is configured such that a negative pressure is able to be applied to the connecting device, so that a fluid surrounding the angle-measuring device with a pressure flows through the angle-measuring device to remove contaminants by suction. 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.
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