WO2003051225A1 - Zahnbürstenantriebswelle und verfahren zu ihrer herstellung - Google Patents
Zahnbürstenantriebswelle und verfahren zu ihrer herstellung Download PDFInfo
- Publication number
- WO2003051225A1 WO2003051225A1 PCT/EP2002/012231 EP0212231W WO03051225A1 WO 2003051225 A1 WO2003051225 A1 WO 2003051225A1 EP 0212231 W EP0212231 W EP 0212231W WO 03051225 A1 WO03051225 A1 WO 03051225A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- winding body
- force transmission
- piece
- drive shaft
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
- A61C17/16—Power-driven cleaning or polishing devices
- A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
- A61C17/222—Brush body details, e.g. the shape thereof or connection to handle
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
- A61C17/16—Power-driven cleaning or polishing devices
- A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
- A61C17/32—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating
- A61C17/34—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor
-
- 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
- F16H—GEARING
- F16H21/00—Gearings comprising primarily only links or levers, with or without slides
- F16H21/10—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane
- F16H21/40—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for interconverting rotary motion and oscillating motion
Definitions
- the present invention relates to a drive shaft for small electrical appliances of personal use.
- the invention relates to a toothbrush drive shaft with a shaft shaft on which a force transmission piece, in particular an eccentric crank piece, sits in a rotationally fixed manner.
- the invention relates to a method for producing such a drive shaft, in which the force transmission piece and the shaft shaft are manufactured separately and then joined together.
- the brush head is usually connected to the electric motor of the toothbrush via a gear mechanism which converts the rotary drive movement of the electric motor into a rotatably oscillating drive movement, so that the brush head is driven back and forth.
- An output shaft coupled to the brush head is regularly provided, which has an eccentric crank piece, via which it is driven by the engine through a further part of the drive train or the transmission.
- Such a drive shaft is shown, for example, in EP 0 560 758 B1, according to which a crank plate is seated on the motor-side end of the shaft and carries an eccentric coupling pin arranged parallel to the longitudinal axis of the shaft.
- this known drive shaft can be improved in various ways.
- the power transmission piece designed as a crank plate is difficult to manufacture due to the tolerances to be adhered to and is therefore expensive.
- the coupling pin must be anchored in the correct position on the crank plate.
- the hole provided for this purpose in the crank plate must be made with the appropriate precision.
- very small tolerances must also be adhered to in the bore with which the crank plate sits on the shaft shaft in order to obtain the desired press fit and to be able to transmit the necessary torques.
- the present invention is therefore based on the object of specifying an improved drive shaft of the type mentioned at the outset and an improved method for its production, avoiding the disadvantages of the prior art and developing the latter in an advantageous manner.
- an eccentric power transmission piece for the drive shaft that is simple and inexpensive to manufacture is to be created, which nevertheless reliably transmits moments.
- the force transmission piece has a winding body which wraps around the shaft shaft in a rotationally fixed manner.
- a crank plate with a receiving bore which sits on the shaft shaft in a press fit
- a helically looped fastening section is provided, which sits non-positively on the shaft shaft.
- the force transmission piece including its winding body and a function arm connected to it, can be formed in one piece, in particular consist of bent wire, the force transmission piece can consist of spring steel, so that it is elastic and forms a spring body.
- a freely projecting crank arm can be provided as the functional arm, with the aid of which a moment can be transmitted from or to the shaft.
- an eccentrically arranged coupling pin is provided as the crank arm, with which the next component in the gear train can engage.
- the coupling pin is preferably formed by a protruding end of the wire from which the winding body of the spring element is wound.
- the spring or winding body can advantageously be produced very inexpensively on a conventional spring winding machine for compression and tension springs.
- the force transmission piece is thus bent according to the invention from a wire which is bent in sections to the helical winding body and then pushed onto the shaft shaft, so that the winding body is seated on the shaft shaft in a rotationally fixed manner.
- the bobbin does not necessarily have to be moved to push it onto the shaft.
- the shaft can also be inserted into the fixed and held winding body.
- it can be considered to wind the winding body directly on the shaft.
- it is particularly advantageous to first manufacture the winding body without participation of the shaft with an inner diameter that is smaller than the outer diameter of the shaft shaft and then the winding body with an expanding tool to a mounting diameter that is at least as large as the outer diameter of the shaft shaft expand and slide onto the shaft.
- the elastic expansion is reversed by removing the expansion tool, so that the wedge kel emotions resets or tries to reset and thereby stretches around the shaft. As a result, it sits permanently on the shaft shaft in a friction and non-positive manner.
- alignment means provided on the expansion tool can be used, with the aid of which the functional arm of the force transmission piece and on the other hand the portion of the shaft shaft defining the rotational orientation can be scanned or gripped.
- the shaft shaft can have a flattened portion or a notch at its end opposite the force transmission piece, due to which it is not completely rotationally symmetrical and the rotational alignment of the force transmission piece is necessary during assembly.
- a positive connection between the winding body and the shaft shaft could also be provided.
- an oval cross section of the shaft shaft could be provided in the area of the force transmission piece and, accordingly, an oval contour of the winding body.
- the winding body is preferably seated on the circular shaft shaft in a force-locking or friction-locking manner. In this way, slipping of the force transmission piece can advantageously be achieved in the event of overloading, without damaging the connection between the force transmission piece and the shaft shaft. In contrast, with conventional crank plates, overloading always leads to permanent damage.
- Both the winding body and the shaft shaft expediently have the shape of a circular cylinder.
- the shaft shaft is circular cylindrical at least in its area in which the winding body is arranged.
- the wrap angle of the winding body can be selected differently depending on the torque to be transmitted. According to the Eytelwein principle With increasing wrap angle, an increase in the transmissible torque can be achieved.
- the wrap angle is between 4 ⁇ and 12 7, preferably 6 ⁇ to 10 ⁇ .
- the wrap angle can be approximately 8 ⁇ , that is to say the helical winding body winds around the shaft approximately four times.
- the wire from which the force transmission piece is wound can be chosen differently with regard to its material thickness, in particular adapted to the diameter of the shaft shaft.
- the wire diameter can be selected according to the diameter of the coupling pin that is carried by the coupling plate to be replaced. This makes it possible to use the drive shaft as an exchange part without having to change the other parts of the transmission between the electric motor and the toothbrush head.
- the wire used for the winding body will have a material diameter that is smaller than the diameter of the shaft shaft, preferably approximately% to Va times the shaft shaft diameter.
- Figure 1 is a sectional view of an electric toothbrush with a motor-driven
- Output shaft according to a preferred embodiment of the invention, according to which a crank piece with a winding section made of spring steel sits on the output shaft as a force transmission piece,
- Figure 2 is an enlarged side view of the output shaft with the seated thereon
- FIG. 3 shows a plan view of the end face of the output shaft from FIG. 2, which shows the rotational orientation of the crank piece relative to the flattened end of the output shaft,
- FIG. 4 shows an enlarged top view of the crank piece from the previous figures designed as a spring body with a winding section, partial view b) being rotated by 90 ° with respect to partial view a) and partial view c) a section through the spring body along the line AA in partial view a), and
- FIG. 5 shows a plan view of the end face of the spring body from FIG. 4.
- the electric toothbrush shown in FIG. 1 has, in a manner known per se, a housing 1 which forms the handpiece of the toothbrush and receives an electric drive for moving a brush attachment (not shown).
- a housing 1 which forms the handpiece of the toothbrush and receives an electric drive for moving a brush attachment (not shown).
- an electric motor 2 and a gear 3 driven by it are accommodated, which comprises an output shaft 4 emerging from the end of the housing 1 in order to drive a brush head which can be plugged into the front end of the housing 1 in a rotationally oscillating manner.
- the output shaft 4 has a flattened portion 5 at its front end and a notch provided opposite the flattened portion in order to be able to be coupled to the drive train on the brush head side.
- a battery receiving compartment 7 is provided in order to receive batteries for the energy supply of the electric motor 2.
- the output shaft 4 and the electric motor 2 are arranged with their motor output shaft 8 parallel to one another, but offset.
- the transmission 3 comprises various engaging and deflecting parts such as crank, coupling and rocker arm and finally the crank piece 9, which is non-rotatably seated on the output shaft 4, as will be explained, in order to rotate the motor output shaft 8 in an oscillating rotary movement implement the output shaft 4 in a manner known per se.
- the output shaft 4 is rotatable in the housing 1, but axially fixed. It sits with its rear end in a bearing bush 10, which absorbs axial compressive forces.
- the output shaft 4 can be secured against pulling out by the crank piece 9 firmly seated on the shaft shaft, via which the shaft axially abuts or would abut a bearing shoulder 11 fixed to the housing if tensile forces act on the shaft.
- the output shaft 4 has a straight, elongated shaft shaft 12 which, apart from its end flattening 5 and the notch 6, is cylindrical with a circular cross section.
- the shaft shaft can expediently consist of steel or a similarly high-strength material.
- the crank piece 9 comprises a helical winding body 13 as well as a function arm 14 which is firmly connected to the winding body 13 a crank pin which projects eccentrically from the shaft shaft 12.
- the crank arm or pin extends essentially parallel to the longitudinal axis of the shaft 12.
- the winding body 13 and the crank arm 14 are in one piece and form a spring body made of spring steel.
- the winding body 13 is wound helically in the manner of a cylinder spring.
- the spring steel runs out to one side into the crank arm 14, which initially extends radially over the circumference of the winding body 13 and is finally bent in the longitudinal direction of the winding body, so that the free end of the crank arm 14 extends parallel to the longitudinal axis of the winding body 13 (cf. Figure 4 a and b).
- the opposite end of the spring steel, from which the crank piece 9 is wound also runs out slightly in the radial direction, as shown in FIG. 5, which facilitates the spreading of the winding body for its assembly on the shaft shaft, as will be explained below.
- FIG. 5 shows, the ends of the wire from which the crank piece 9 is wound run out on different sides and form an acute angle to one another in the end view from above.
- the crank piece 9 with its winding body 13 can advantageously be manufactured very inexpensively on a conventional spring winding machine for compression or tension springs.
- the number of turns of the winding body 13 can be selected differently and can be adapted to the torque to be transmitted. In the illustrated embodiment, four complete windings are provided, that is, the wrap angle of the winding body 13 is approximately 8 ⁇ .
- the winding body 13 is first wound on the spring winding machine with an inner diameter that is smaller than the outer diameter of the shaft shaft 12.
- the winding body 13 is then slightly widened by means of an expansion tool, not shown, so that the shaft shaft 12 is pushed into the winding body 13 in the axial direction can be until he assumes the position shown in Figure 2.
- the crank piece 9 assumes the rotational orientation desired with respect to the flat 5.
- the expanding tool advantageously engages the crank arm 14 of the spring body.
- the flattening 5 is scanned or gripped by the expanding tool when the shaft shaft 12 is pushed in, so that the crank arm 14 of the crank piece 9 always comes to rest on the shaft shaft in the desired orientation with respect to the flattening 5.
- crank arm 14 could in principle be bent to different sides. Unlike shown in the figures, the free-running end, which forms the crank arm 14, could be bent back, that is to say bent downwards according to FIG. 4, so that it would extend back over the winding former 13 and opposite the winding former and radially outside the latter , In the embodiment shown in FIG. 4, however, the crank arm 14 extends away from the winding body 13, so that it projects in the axial direction on the end face over the winding body 13. This has the advantage that, with the same lever arm, more air remains in the radial direction between the shaft shaft and the crank arm 14, insofar as the winding body 13 does not extend between them. As a result, the swing arm of the transmission 3 can have more meat around the recess into which the crank arm 14 engages.
- Spring steel of different diameters can be used for the crank piece 9 and the material thickness can be adapted to the moments to be transmitted or also to the diameter of the shaft shaft.
- the material thickness of the spring steel from which the winding body 13 is wound is between 1 and 2 mm, preferably between 1 and 1.5 mm.
- a spring wire with a circular diameter of approximately 1.2 mm is provided.
- the drive shaft shown in FIG. 2, together with the crank piece 9, which is non-rotatably fastened thereon, is inserted into the housing 1 of the electric toothbrush, so that the drive shaft is held in the bearings provided for this purpose.
- the crank piece 9 is inserted with its crank arm 14 into the receiving bore provided for this purpose or possibly the longitudinal groove of the rocker immediately following in the drive train, so that it engages with it.
- the reciprocating movement of the rocker is then transmitted by the crank piece 9 into a rotationally oscillating drive movement of the drive shaft 4.
- the force transmission piece with the winding body which is non-rotatably seated on the shaft can also be used as a motor eccentric or as a transverse axis on smooth shafts.
- the previously described force transmission piece preferably forms the crank piece 9 of the output shaft of an electric toothbrush.
Landscapes
- Health & Medical Sciences (AREA)
- Dentistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Brushes (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002361953A AU2002361953A1 (en) | 2001-12-17 | 2002-11-02 | Toothbrush drive shaft and method for production thereof |
EP02796539A EP1455678A1 (de) | 2001-12-17 | 2002-11-02 | Zahnbürstenantriebswelle und verfahren zu ihrer herstellung |
US10/499,055 US20050102774A1 (en) | 2001-12-17 | 2002-11-02 | Toothbrush drive shaft and method for production thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10161977A DE10161977A1 (de) | 2001-12-17 | 2001-12-17 | Zahnbürstenantriebswelle und Verfahren zu ihrer Herstellung |
DE10161977.4 | 2001-12-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003051225A1 true WO2003051225A1 (de) | 2003-06-26 |
Family
ID=7709545
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/012231 WO2003051225A1 (de) | 2001-12-17 | 2002-11-02 | Zahnbürstenantriebswelle und verfahren zu ihrer herstellung |
Country Status (6)
Country | Link |
---|---|
US (1) | US20050102774A1 (de) |
EP (1) | EP1455678A1 (de) |
CN (1) | CN1604760A (de) |
AU (1) | AU2002361953A1 (de) |
DE (1) | DE10161977A1 (de) |
WO (1) | WO2003051225A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5292913B2 (ja) * | 2008-05-09 | 2013-09-18 | オムロンヘルスケア株式会社 | 電動歯ブラシ |
JP5547468B2 (ja) * | 2009-12-25 | 2014-07-16 | パナソニック株式会社 | 電動歯ブラシ |
CN106659555B (zh) | 2014-07-02 | 2020-09-22 | 皇家飞利浦有限公司 | 自动牙刷的轴 |
EP3300687B1 (de) * | 2016-09-28 | 2019-04-24 | Braun GmbH | Elektrisch angetriebene vorrichtung |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5732432A (en) * | 1996-11-20 | 1998-03-31 | Addway Engineering Limited | Electric toothbrushes |
WO1998047444A1 (de) * | 1997-04-24 | 1998-10-29 | Braun Aktiengesellschaft | Bürstenteil für eine elektrische zahnbürste |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2559602A (en) * | 1948-01-21 | 1951-07-10 | Piqua Eng Inc | Vibratory motor |
US3886806A (en) * | 1972-07-20 | 1975-06-03 | Shimaro Ind Co Ltd | Operating lever for actuating a gear-shifting means mounted on a bicycle |
US3808905A (en) * | 1972-09-29 | 1974-05-07 | Bunker Ramo | Worm drive for electrically wound clock |
CH625687A5 (en) * | 1978-01-20 | 1981-10-15 | Gimelli & Co Ag | Electric toothbrush with oscillating armature motor for mains power supply |
-
2001
- 2001-12-17 DE DE10161977A patent/DE10161977A1/de not_active Ceased
-
2002
- 2002-11-02 EP EP02796539A patent/EP1455678A1/de not_active Withdrawn
- 2002-11-02 AU AU2002361953A patent/AU2002361953A1/en not_active Abandoned
- 2002-11-02 US US10/499,055 patent/US20050102774A1/en not_active Abandoned
- 2002-11-02 CN CN02825224.1A patent/CN1604760A/zh active Pending
- 2002-11-02 WO PCT/EP2002/012231 patent/WO2003051225A1/de not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5732432A (en) * | 1996-11-20 | 1998-03-31 | Addway Engineering Limited | Electric toothbrushes |
WO1998047444A1 (de) * | 1997-04-24 | 1998-10-29 | Braun Aktiengesellschaft | Bürstenteil für eine elektrische zahnbürste |
Also Published As
Publication number | Publication date |
---|---|
EP1455678A1 (de) | 2004-09-15 |
US20050102774A1 (en) | 2005-05-19 |
AU2002361953A1 (en) | 2003-06-30 |
CN1604760A (zh) | 2005-04-06 |
DE10161977A1 (de) | 2003-07-10 |
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