Ball bearing structure with tilt correction

摘要

Disclosed is a dental handpiece and a related technique that can satisfactorily reduce vibration and have a long service life. A dental handpiece for rotationally driving a rotary dental tool (20) having a handle (12) and a chuck (14) serving as a receiver of the dental tool (20). 10), a turbine wheel (16), a turbine having a rotor shaft (18) connected to the chuck (14) so as to rotationally drive the chuck (14) and driven by compressed gas, At least one ball bearing (30) having a ball (31), an inner ring (32), an outer ring (34) and a ball bearing cage (33), and rotatably supporting the rotor shaft (18), The inner ring (32) of the ball bearing (30) is arranged on the rotor shaft (18) and the ball bearing (3 ) Outer ring (34) is supported in housing (10) via elastic element (40) to damp vibrations, and outer ring (34) and inner ring (32) are each ball (31). ), The track (L) of the inner ring (32) has a constant curvature when viewed in cross-section, and the radius of curvature substantially matches the radius of the ball (31). The track (L) of the outer ring (34) has a first curvature (35) having a first radius (r0) in the central region when viewed in cross-section, At least one region adjacent to the second radius (r1) has a second curvature (36) and the first radius (r0) is less than the second radius (r1), or The orbit (L) of the outer ring (34) is substantially parabolic when viewed in cross section. To provide a dental handpiece having a. [Selection] Figure 5