Dental turbine
AssigneeDENTSPLY SIRONA Inc.
InventorsSiegfried Goisser, Stefan Göbel
Life of this patent
Estimating the term…
Abstract
A dental turbine driven by pressurized air comprises a head housing (1) with a turbine chamber (2) and a rotor shaft (3) mounted using an anti-friction bearing (8a) with a non-rotatably mounted turbine wheel (13). The outer race (10a) of the anti-friction bearing (8a) extends into the turbine chamber (2) in axial direction. The turbine wheel (13) comprises an annular web (16a) that is arranged concentrically to the outer race (10a) of the anti-friction bearing (8a) and, together with the outer race (10a), forms a gap seal (17a). This gap seal (17a) extends in axial direction between outer race (10a) and annular web (16a) and prevents the sucking-in of liquids and dirt particles into the turbine chamber (2) during inertial rotation of the turbine wheel (13).
Claims9
A dental turbine for driving a dental preparation tool by pressurized air, comprising:
- a head housing, inside of which a turbine chamber is formed,
- a rotor shaft that is rotatably mounted in the head housing using two coaxial anti-friction bearings arranged at an axial distance from one another and that has a chuck for receiving the preparation tool, and
- a turbine wheel that is arranged in the turbine chamber and that is non-rotatably mounted to the rotor shaft,
- wherein
- an outer race of each anti-friction bearing extends into the turbine chamber in an axial direction at opposite sides, and
- the turbine wheel is arranged between the two anti-friction bearings and has two annular webs that are positioned axially opposite one another and which are arranged concentrically to the respective outer races of the anti-friction bearings and each forms a gap seal together with the respective adjacent outer race.
Dependencies are inferred from the claim text.