EP1082064A1 - Systeme d'entrainement pour pieces a main dentaires - Google Patents

Systeme d'entrainement pour pieces a main dentaires

Info

Publication number
EP1082064A1
EP1082064A1 EP99927758A EP99927758A EP1082064A1 EP 1082064 A1 EP1082064 A1 EP 1082064A1 EP 99927758 A EP99927758 A EP 99927758A EP 99927758 A EP99927758 A EP 99927758A EP 1082064 A1 EP1082064 A1 EP 1082064A1
Authority
EP
European Patent Office
Prior art keywords
drive system
motor
race
handpiece
dental
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99927758A
Other languages
German (de)
English (en)
Inventor
Eugen Eibofner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kaltenbach and Voigt GmbH
Original Assignee
Kaltenbach and Voigt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26061549&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1082064(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE29813086U external-priority patent/DE29813086U1/de
Application filed by Kaltenbach and Voigt GmbH filed Critical Kaltenbach and Voigt GmbH
Publication of EP1082064A1 publication Critical patent/EP1082064A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/32—Balls
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/02—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools
    • A61C1/06—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools with electric drive
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/08—Machine parts specially adapted for dentistry
    • A61C1/18—Flexible shafts; Clutches or the like; Bearings or lubricating arrangements; Drives or transmissions
    • A61C1/181—Bearings or lubricating arrangements, e.g. air-cushion bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/30—Electric properties; Magnetic properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/10—Application independent of particular apparatuses related to size
    • F16C2300/12—Small applications, e.g. miniature bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2316/00—Apparatus in health or amusement
    • F16C2316/10—Apparatus in health or amusement in medical appliances, e.g. in diagnosis, dentistry, instruments, prostheses, medical imaging appliances
    • F16C2316/13—Dental machines

Definitions

  • the invention relates to a drive system for dental handpieces according to the preamble of claim 1.
  • Medical or dental handpieces generally include an instrument section for receiving a dental tool, for example a turbine drill, a drive motor for driving the rotating dental tool, and a hose section with a media supply hose for supplying certain supply media for the operation of the dental tool, such as electricity , Spray or cooling air, spray water, etc.
  • a dental tool for example a turbine drill
  • a drive motor for driving the rotating dental tool
  • a hose section with a media supply hose for supplying certain supply media for the operation of the dental tool, such as electricity , Spray or cooling air, spray water, etc.
  • FIG. 7 shows an example of the three individual components instrument section 1 with the dental tool 5, drive motor 3 and hose section 2 with the media feed hose 4 rotatably mounted on the head part 6, which are coupled directly one behind the other by being plugged on.
  • Such a structure is known for example from DE-C2 28 34 099.
  • An alternative type of construction is shown in FIG. 8.
  • the drive motor 3 is a so-called motor cartridge, which is held in a cavity formed by the instrument section 1 and the hose section 2.
  • An electric motor in particular a direct current motor, as is known from DE-Al 196 04 628 of the applicant, is used as the drive motor, for example.
  • the drive motor essentially comprises a rotor magnet rotatably mounted via a motor shaft and a stator with a self-supporting stator air gap winding which has free spaces for media lines which supply certain supply media to the connectable dental instrument.
  • the motor shaft is supported in a motor housing by a front and a rear motor bearing.
  • Rolling bearing arrangements are usually used as motor bearings, which are composed of an inner race, an outer race and a plurality of roller elements arranged between the two race rings, both the race rings and the roller elements being formed from steel in a manner known per se.
  • an AC motor can also be used.
  • an air motor can also be used as the drive motor.
  • an electric motor direct current or alternating current
  • an air motor can also be used as the drive motor.
  • the air motor designed as a lamella motor has a central shaft which is rotatably mounted in a circular chamber which is offset from the center and which has radial slots in which lamellae are caused by the force of one
  • the spring of the air motor is also supported by means of roller bearing arrangements in the housing
  • the air motor in contrast to the above-mentioned electric motor, is in principle suitable to withstand repeated sterilizations, the air motor can also be an integral part of the instrument connector. When using an electric motor, however, this must be detachably connected to the instrument section in order to separate it from the instrument section for the standing process. since the electronic components of the electric motor generally do not withstand repeated sterilizations, at least in the long run
  • Stator or motor housing and rotor of the Ant ⁇ ebsmotors hereby prevents that in the event of a defect in the drive motor, current can flow to the patient or the treating personnel via the ball bearings and the housing of the drive motor
  • the advantageous material properties of ceramic materials include, in particular, the lower specific weight, the lower thermal conductivity, the significantly better resistance to chemicals and disinfection and / or stabilizing agents and the better temperature resistance than steel
  • FIG. 1 shows a schematic illustration of an anti-subsystem according to the present invention in section along its longitudinal axis
  • FIG. 2 shows a dental handpiece with a drive system according to the prevailing one
  • FIG. 5 shows a longitudinal section of a drive system according to the invention in a modified configuration in axial section
  • FIG. 6 shows a front roller bearing of the drive system according to FIG. 5 as a single structural unit in axial section.
  • Fig. 7 is a conventional dental handpiece schematic representation
  • Fig. 8 shows another conventional dental handpiece in a schematic representation.
  • the present invention is basically applicable for both drive options.
  • FIG. 1 initially shows a drive system 3 according to the invention (electric or air drive) in a schematic representation.
  • a rotor 12 fastened to a central motor shaft 11 is arranged in a motor housing 10.
  • the motor shaft 11 is rotatably supported in the motor housing 10 by means of a front motor mount 13 and a rear motor mount 14.
  • the engine housing 10 On the side facing the front engine mount 13, the engine housing 10 also has an advantageously standardized coupling element 15 for coupling a dental instrument 1 to be driven.
  • the coupling element 15 contains a coupling pin 16 which is connected in a rotationally fixed manner to the motor shaft 11 and which engages with a corresponding driver pin of the instrument section 1 when the instrument section 1 is plugged in and mechanically transmits the rotary movement of the motor shaft 11. This mechanical movement in the instrument section 1 is further transmitted to the dental tool 5 held on the head part 6 of the instrument section 1 by known, suitable mechanical connecting elements.
  • the two motor bearings 13, 14 are each designed in the form of roller bearing arrangements. They consist essentially of an inner race 17, an outer race ring 18 and a plurality of rolling elements 19 arranged between the two races 17, 18, which are in particular in the form of balls and allow relative movement of the race rings 17, 18 to each other.
  • rolling elements 19 made of an electrically non-conductive material are now used in the composition of the roller bearing arrangements 13, 14. This ensures electrical insulation between the stator or motor housing 10 and rotor 12 of the drive motor 3. This can be effectively prevented by simple means that 3 current through the ball bearings 13, 14 and the motor housing 10 to the patient or the treating person in the event of a defect in the drive motor Staff can drain.
  • rolling elements 19 made of a ceramic material has proven to be particularly advantageous in the selection of the rolling bearing composition. You can choose between a full ceramic roller bearing and a steel roller bearing with ceramic Roll elements (so-called hybrid rolling bearings) can be selected. In any case, at least the rolling elements 19 are formed from a ceramic material.
  • silicon nitride (Si 3 N 4 ) has proven to be the most suitable ceramic for rolling bearings of the type described above.
  • Shaped bodies made of silicon nitride can be produced by reaction sintering, sintering, hot pressing and hot isostatic pressing, whereby combined manufacturing processes are also possible.
  • the lower thermal conductivity of the ceramic also has the effect that the heat developed by the rotor rotation from the rotor 12 is poorly transported to the outside of the motor housing 10. This better thermal insulation is particularly useful for motor handpieces that are held by the user.
  • FIG. 2 shows a dental handpiece with the drive system 3 connected to the instrument section 1.
  • the coupling 15, 16 additionally has a circumferential coupling insulation 27, which consists of an electrically non-conductive material, preferably a plastic material.
  • the metal generally motor housing 10 is electrically isolated from the instrument section 1, so that a further security function is given to the patient, because there is no current through the motor housing 10 to the instrument section 1, and possibly the dental ⁇ tool can flow. 5
  • the drive point of the direct current motor 3 shown in FIG. 3 is arranged in a motor housing 10, a coupling element 15 being connected to the motor housing 10, onto which a dental instrument 1 to be driven by the direct current motor can be plugged.
  • This coupling element 15 is generally concerned around a standardized coupling
  • the motor shaft 11 is rotatably supported by a front motor bearing 13 and a rear motor bearing 14 in a rear bearing sleeve 20, ceramic roller bearings or hybrid roller bearings according to FIG. 1 being used for the two motor bearings 13, 14
  • the rotor 12 fastened on the motor shaft 11 is surrounded by a stator 21, which consists of a soft magnetic return ring 21a and then a self-supporting stator air gap winding 21b, the return line 21a preferably being produced as a laminated iron return line.
  • the self-supporting stator air gap winding 21b is poured out or injection-molded with plastic and has free spaces for guiding media lines 22 for supplying the connectable dental instrument 1.
  • the DC motor 3 is designed such that after dismantling the coupling element 15 the rotor 12 is removed laterally from the motor housing 10 without further dismantling measures can be pulled out, so that in the event of a repair, the two roller bearings 13, 14 are much more easily accessible
  • the air motor 3 shown in cross section in FIG. 4 is designed in a manner known per se as a lamella motor.
  • the air motor 3 has a central motor shaft 11, which is rotatably mounted in a circular chamber 23 offset from the center.
  • the motor shaft 11 is also supported here Ceramic roller bearings or hybrid roller bearings according to FIG. 1 are used
  • the motor shaft 11 has radial slots 24, in which the lamellae 25 are each pressed radially outward by the force of a spring 26 to bear against the inner wall of the chamber 23. Slightly offset from the point at which the motor shaft 11 approaches the closest the inner wall of the chamber 23 is supplied with air, which acts on the fins 25 and rotates them together with the motor shaft 11, the supplied air leaving the chamber 23 where the greatest distance is present between the motor shaft 11 and the inner wall of the chamber 23. Depending on which side the air is supplied from the point of closest approach, the motor shaft 11 rotates to the right or to the left.
  • the air motor 3 is designed such that the chamber 23 has the air both on the right and on the left can be fed from the point of closest approximation, the feed either being on the right or on the left.
  • a more detailed description of such an air motor 3 is disclosed, for example, in the applicant's already mentioned DE-C2 32 15 255.
  • the ring seal 31 cooperate directly with the engine mount 13, 14 or interact indirectly therewith.
  • the ring seal 31 is preferably arranged on the outside of the engine mount 13, 14, respectively.
  • an annular seal 31 on the outside and inside.
  • the motor mount 13, 14 is arranged, for example in an annular recess, in such a way that
  • FIG. 5 shows a drive system 3 with an electric motor in the region of the motor mount 13, which is arranged on the side of the motor facing the instrument section 1 (not shown).
  • a sealing ring 32 is provided, which cooperates in a sealing manner with the inner or outer race 17, 18 of the engine mount 13.
  • the sealing ring 32 In the first case, in which the sealing ring 32 interacts with the inner race 17 (not shown), the sealing ring 32 is seated in contact with a component which surrounds the motor shaft 11 with play, and in the second case in which the sealing ring 32 with the outer race 18 sealingly cooperates, the sealing ring 32 sits indirectly or directly on the motor shaft 11, so that in each of these cases a seal either between the inner race 17 and a ring part surrounding the motor shaft 11 or between the outer race 18 and indirectly or directly with the motor shaft 11 is created.
  • an essentially radially extending ring leg 33 is assigned to the motor bearing 13, which can extend radially outward from the inner race 17 or radially inward from the outer race 18 and in each case ends near or overlaps the other race.
  • an annular gap 34 must be provided between the races 17, 18, which is electrically conductive or metal races 17, 18 is so large that no electrical current flow or arcing can occur.
  • the inner and / or outer race 17, 18 can also consist of electrically non-conductive material, preferably of a ceramic material. The ceramic materials already described are also suitable for such a ceramic.
  • the ring leg 33 and the races 17, 18 overlap one another, forming a cover if they are at a distance from one another and forming a seal when they are in contact with one another.
  • the outer end face of the ring leg 33 forms a preferably flat or radial sealing surface 35 for the sealing ring 32, which preferably contacts the sealing surface 35 with a sealing lip 32a or presses against it with a slight axial elastic tension.
  • the sealing lip 32a is integrally formed on an annular base 32b, which in the present exemplary embodiment is preferably seated on the motor shaft 11 with a radial tension and, for. B. abuts a shoulder 11a of the motor shaft and is limited or secured against removal from the associated race.
  • the sealing lip 32a extends in a hollow cone in a divergent manner, wherein it can include a cone angle of approximately 30 ° to 60 °, in particular approximately 45 °. Due to the possibly elastic contact of the sealing ring 32 made of elastic material or the sealing lip 32a, the sealing of the annular gap between the race 17, 18 is ensured.
  • the strength of the sealing lip 32a can be so great that it is bent and / or stretched outwards by centrifugal force when the motor shaft 11 is exceeded, and its elastic pressure force on the ring leg 33 is reduced or lifts off from it.
  • the former is desirable in order to reduce the axial pressing force and the friction on the sealing surface 35 during a high-speed run.
  • the latter namely the lifting, is harmless since, due to the centrifugal force, foreign substances or impurities cannot get into the annular gap between the annular leg 33 and the sealing lip 32a during the rotation.
  • annular seal 41 which is effective between the races 17, 18 and has a sealing washer 42 which is held at its one radial edge 42a in an annular groove 43 of one raceway and with the other Edge 42b cooperates with the other raceway, a small annular gap 44 being able to be present therebetween, or this edge 42b can be in contact with the other raceway with a small axial elastic tension.
  • the outer edge 42a of the sealing washer 42 is seated in an annular groove 43 in the outer race 18, and it is secured therein by a locking ring 46 which is inserted in an annular undercut 47 and can, for example, be made of elastic material, whereby it is inserted into the Undercut 47 can be compressed and thus locked.
  • the outer undercut edge 48 is preferably slightly larger in diameter than the outer diameter of the sealing washer 42, so that it can be inserted through the undercut edge 48.
  • the sealing disk 42 is preferably made of an axially elastic material when it is in axial tension on the associated race, which can be metal, for example spring steel or plastic.
  • the sealing washer 42 consists of electrically non-conductive material, such as plastic.
  • the sealing washer 42 can also consist of electrically conductive material.
  • the latter also applies to a cage 49 which positions the rolling elements or balls or rolling elements 19 and which can consist of electrically conductive, for example metal or electrically non-conductive, for example plastic, and has at least one of the races 17, 18 a radial play.
  • annular grooves 51 which are axially spaced from one another, with at least one annular groove 51 having a ring 52, preferably round in cross section, made of elastic material, which in the inserted state has a larger outer diameter than the outer surface , so that it protrudes radially somewhat and presses in the assembled state with elastic tension on the opposite inner wall 53 of the bearing hole receiving the race 18.
  • This configuration is advantageous in two ways. On the one hand, this creates a simple and advantageous seal of the joint between the race 18 and the inner wall 53.
  • the elastic ring 52 bridges a radial bearing play or assembly play present between the race 18 and the inner wall 53, as a result of which the mounting of the motor shaft 11 is improved.
  • a centrally arranged annular groove 43 or two, in particular eccentrically arranged, annular grooves 43 can be arranged.
  • the inner wall 53 of the bearing hole is located on a radial bearing wall 54 in the drive motor section 3, which can be part of a front or rear motor sleeve 55, 56, which are screwed and sealed axially at 57 and preferably have the same outer diameter.
  • the invention relates not only to a drive system 3, but also to at least one motor mount 13, 14 which is sealed or covered on one or both sides for protection against foreign substances or impurities, and with which as the only component or unit advantages described above can also be achieved.

Landscapes

  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Dentistry (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

L'invention concerne un système d'entraînement pour pièces à main dentaires, dans lequel des mesures pour respecter les exigences de sécurité électrique ont été prises de façon simple dans le but d'accroître la sécurité du patient et du personnel soignant. Ce système d'entraînement présente un rotor (12) fixé sur un arbre de moteur (11), au moins un ensemble palier à roulement (13, 14) pour le montage sur palier de l'arbre de moteur (11), ledit ensemble palier à roulement (13, 14) comprenant une bague de roulement intérieure (17), une bague de roulement extérieure (18) et plusieurs éléments de roulement (19) placés entre les bagues de roulement (17, 18). Ce système d'entraînement présente également un élément d'accouplement (16) pour l'accouplement d'un instrument dentaire à entraîner (1). Selon l'invention, les éléments de roulement (19) de l'ensemble ou des ensembles palier à roulement (13, 14) sont constitués d'un matériau électriquement non conducteur, ce qui assure une isolation électrique entre le stator ou le boîtier de moteur (10) et le rotor (12) du moteur d'entraînement, et empêche que des décharges électriques ne parviennent au patient ou au personnel soignant par l'intermédiaire des paliers de roulement (13, 14) et du boîtier (10) du moteur d'entraînement, en cas de défaillance de ce dernier. De manière avantageuse, on utilise des ensembles palier de roulement en acier, comportant des éléments de roulement en céramique ('paliers de roulement hybrides') ou des ensembles palier de roulement entièrement en céramique pour le montage sur palier de l'arbre de moteur (11) du système d'entraînement.
EP99927758A 1998-05-26 1999-05-26 Systeme d'entrainement pour pieces a main dentaires Withdrawn EP1082064A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE29809467U 1998-05-26
DE29809467 1998-05-26
DE29813086U DE29813086U1 (de) 1998-05-26 1998-07-22 Antriebssystem für zahnärztliche Handstücke
DE29813086U 1998-07-22
PCT/EP1999/003619 WO1999060944A1 (fr) 1998-05-26 1999-05-26 Systeme d'entrainement pour pieces a main dentaires

Publications (1)

Publication Number Publication Date
EP1082064A1 true EP1082064A1 (fr) 2001-03-14

Family

ID=26061549

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99927758A Withdrawn EP1082064A1 (fr) 1998-05-26 1999-05-26 Systeme d'entrainement pour pieces a main dentaires

Country Status (5)

Country Link
US (1) US6425761B1 (fr)
EP (1) EP1082064A1 (fr)
JP (1) JP2002516141A (fr)
DE (1) DE19843951C2 (fr)
WO (1) WO1999060944A1 (fr)

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WO1999060944A1 (fr) 1999-12-02
DE19843951A1 (de) 1999-12-02
DE19843951C2 (de) 2002-03-14
US6425761B1 (en) 2002-07-30
JP2002516141A (ja) 2002-06-04

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