Rotary Transmission Leadthrough
A rotary transmission leadthrough allows fluids (gases, liquids) a sealed transition between a fixed body and a rotating body or between bodies rotating against each other.
Rotary transmission leadthrough can be single-flow (single-channel) or multi-flow (multi-channel). A simple example of a single-flow rotary transmission leadthrough is the garden sprinkler, in transition to the rotating or pivoting arm. It becomes more complex when fluids, e.g. hydraulic system liquids, must be guided back and forth, under high pressure, if a pair of rotary transmission leadthroughs is required. Single-flow transmissions often use axial, multi-flow, primarily radial interfaces to transfer the media. A rotary transmission leadthrough is also referred to as a device that enables a mechanical rotary movement to be transmitted through a container wall. Applications include e.g. vacuum technology.
Application in the case of machine tools
In the case of machine tools with internally cooled tools, an introduction for the transport of the cooling lubricant into the tool spindle is required. The greatest challenge is to get the medium into the spindle leak-free at up to 120,000 revolutions per minute. In order to guarantee an optimal sealing function of the inlet, it is important that the hoses are installed tension-free. Multi-channel rotary transmission leadthroughs are used also on rotary tables with hydraulic clamping fixtures.
Source: German Wikipedia