Medical or dental-medical handpiece having at least one rotary part

Roller bearing (21), in particular a miniature roller bearing, for a medical or dental-medical handpiece (3), having roller bodies (22) between an outer and an inner running ring (23, 25), arranged in raceways (22a),

• characterised in that,
• the roller bearing (21) has roller bodies (22) arranged in two roller body rows at an axial spacing (a) from one another, and the axial spacing (a) is greater than the mean diameter (b) of the roller bodies (22) in one or in both rows.

Medical or dental-medical handpiece or roller bearing according to any preceding claim,

• characterised in that,
• the inner or outer running ring (23, 25) is of two ring parts (23a, 23b) arranged axially behind one another.

Medical or dental-medical handpiece according to any preceding claim,

• characterised in that,
• the roller bearing (21) is arranged in the forward end region of the handpiece (3) and mounts a turbine rotor (15a) and/or a receiving sleeve (18) for a tool (6).

Medical or dental-medical handpiece according to any preceding claim,

• characterised in that,
• there is arranged on the end face of the inner running ring (25) and/or of the outer running ring (23) in each case a flange (23c) and/or (25c) extending radially outwardly or radially inwardly.

Roller bearing (21), in particular miniature roller bearing, for a medical or dental-medical handpiece (3), having roller bodies (22) between an outer and an inner running ring (23, 25), arranged in raceways (22b),

• characterised in that,
• there is arranged at the end face of the inner running ring (25) and/or of the outer running ring (23) in each case a flange (23c) and/or (25c) extending radially outwardly or radially inwardly and
• the roller bodies (22) of one roller body row are arranged between the flange (23c) or (25c) of the one running ring and the axially oppositely lying end face of the other running ring.

Medical or dental-medical handpiece (3) having a rearward and a forward shaft section (13a, 13b), which include an obtuse angle, there being rotatably mounted in the shaft sections (13a, 13b) in each case a drive shaft section (33a, 33c) which stand in driving connection with one another,

• characterised in that,
• between the rearward and the forward drive shaft section (33a, 33c) there is arranged a middle drive shaft section (33b) which is connected with the rearward and the forward drive shaft section (33a, 33c) by means of gear transmissions.

Roller bearing for a medical or dental-medical handpiece comprising inner and outer running rings with roller bodies having a mean diameter b disposed in raceways defined between said inner and outer running rings, wherein said roller bodies are disposed in two roller body rows spaced-axially from each other by a spacing a, and the inner running ring comprises two ring parts disposed axially behind each other.

Roller bearing for a medical or dental-medical handpiece, comprising inner and outer running rings with roller bodies having a mean diameter b disposed in raceways defined between said inner and outer running rings wherein the roller bodies are disposed in two roller body rows at an axial spacing a from one another, and the axial spacing a is greater than the mean diameter b of the roller bodies in at least one row.

Roller bearing for a medical or dental-medical handpiece comprising inner and outer running rings with roller bodies disposed in two axially spaced rows in raceways defined between said inner and outer running rings, at least one of said inner and outer running rings defining an end face, with a radially inwardly and outwardly extending flange disposed at said end face, with the roller bodies of one roller body row disposed between the flange of one running ring and an axially opposed end face of the other running ring.

Medical or dental-medical handpiece having a forward end region and comprising a rotary part and at least one roller bearing provided for mounting the rotary part, and at least two roller body rows having a mean diameter b disposed adjacent to each other between inner and outer running rings, wherein the roller bearing has roller bodies disposed in two roller body rows and spaced from each other at an axial spacing a, and the inner running ring comprises two ring parts disposed axially behind each other.

Medical or dental-medical handpiece having a rearward shaft section and a forward shaft section, said forward shaft section including an obtuse angle and being adapted to hold a tool, with a respective drive shaft section rotatably mounted in each of the rearward and forward shaft sections, said drive shaft sections being in driving connection with each other, with an apex region disposed between the rearward and the forward drive shaft sections and offset toward a side away from the tool, and a middle drive shaft section which is connected with the rearward and the forward drive shaft sections by means of gear transmissions, wherein the middle and the forward drive shaft sections are in driving connection with each other through a cylindrical gear transmission or a conical gear transmission.