Spindle Know-How

Rotary Trans­mis­sion Leadthrough

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

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