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Support of a machine tool spindle with cooling device in a headstock
| Details |
Inventors: Neugebauer, Heinz;
Assignee: Werkzeugmaschinenfabrik Adolf Waldrich Coburg GmbH & Co. (Coburg, DE)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
In a support for a machine tool spindle (1) adapted for use with a cooling device there are provided feed and discharge channels (12, 13) for a fluidic cooling system in the spindle (1). These channels are connected to cooling grooves (14), which at least in the region of the inner bearing rings (2a) are arranged on the spindle head (1a), are worked into the spindle outer surface (1b) extending in a peripheral direction or helically and are open toward the inner bearing rings (2a). |
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DETAILED DESCRIPTION The machine tool spindle 1 is rotatably supported in a headstock 3 near its spindle head 1a by means of several roller bearings 2.
Gauge rings 5, which rotate with the spindle 1, are provided between each of the inner bearing rings 2a of two mutually adjacent roller bearings and between the endmost inner bearing rings 2a and the parts 1a and 4.
Each of the gauge rings 5 have, in this exemplary embodiment, on their axially facing surfaces, which surfaces engage the axially facing surfaces on adjacent inner bearing rings 2a, annular grooves in which are provided gasket rings 6.
The hub 7 of a bevel gear 8 is fixedly mounted on the inner end of the rotatable spindle 1.
The bevel gear 8 is driven by another bevel gear 9.
The bevel gear hub 7 is supported by roller bearings 10 and an intermediate sleeve 11 in the headstock 3.
Two axially parallel channels, namely, a feed channel 12 and a discharge channel 13 are provided in the spindle 1 and are offset or arcuately spaced at 180.
degree.
with respect to one another.
Cooling grooves 14 are provided in the outer surface 1b of the spindle 1 in the region of the inner rings 2a, which inner rings 2a are provided near the spindle head 1a.
The cooling grooves 14 extend helically in this exemplary embodiment and preferably have a rectangular cross section.
The grooves 14 can, if necessary, however, also have a trapezoidal or semicircular cross section.
The cooling-medium grooves 14 are open radially outwardly toward the inner bearing rings 2a.
The exiting of cooling medium into the inside of the roller bearings 2 is prevented by the gasket rings 6.
In order for flow to occur through the cooling grooves 14 in the counter-flow principle, the cooling groove 14a which is the closest to the spindle head 1a is connected to the feed channel 12 through a connecting bore 15.
The cooling groove 14b most remote from the spindle head 1a is connected to the discharge channel 13 through a connecting bore 16.
The discharge channel discharges at the point 13a into the gear transmission housing
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