EP1062721A1 - Actionneur a precision renforcee - Google Patents

Actionneur a precision renforcee

Info

Publication number
EP1062721A1
EP1062721A1 EP99910863A EP99910863A EP1062721A1 EP 1062721 A1 EP1062721 A1 EP 1062721A1 EP 99910863 A EP99910863 A EP 99910863A EP 99910863 A EP99910863 A EP 99910863A EP 1062721 A1 EP1062721 A1 EP 1062721A1
Authority
EP
European Patent Office
Prior art keywords
bearing
screw
actuator according
nut
hard
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Withdrawn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
EP99910863A
Other languages
German (de)
English (en)
Inventor
Armin Herbert Emil August Olschewski
Clair Druet
Thomas Wilhelm Fucks
Hendrikus Jan Kapaan
Alexander Jan Carel De Vries
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.)
SKF Engineering and Research Centre BV
Original Assignee
SKF Engineering and Research Centre BV
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
Application filed by SKF Engineering and Research Centre BV filed Critical SKF Engineering and Research Centre BV
Publication of EP1062721A1 publication Critical patent/EP1062721A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/18—Electric or magnetic
    • F16D2121/24—Electric or magnetic using motors
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
    • F16D2125/40—Screw-and-nut
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/44—Mechanical mechanisms transmitting rotation
    • F16D2125/46—Rotating members in mutual engagement
    • F16D2125/52—Rotating members in mutual engagement with non-parallel stationary axes, e.g. worm or bevel gears
    • 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
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
    • F16H25/2252—Planetary rollers between nut and screw

Definitions

  • the invention is related to an actuator comprising a housing, a motor, an actuating member and a screw mechanism providing a linear movement of the actuating member with respect to the housing in response to a rotational movement of the motor, said screw mechanism comprising a screw and a nut at least one of which is rotatably supported with respect to the housing by means of a rolling element bearing, said rolling element bearing having an inner raceway and an outer raceway, as well as rolling elements which are in rolling contact with said raceways.
  • Such actuator is known. It can be applied for various purposes, e.g. for a brake calliper of a disc brake.
  • the actuator comprises several components with accurately machined surfaces, such as the threads in the screw and nut, rollers, bearing raceways etc.
  • the invention aims at providing an actuator wherein both demands are satisfied.
  • This aim is achieved in that at least a component of the screw mechanism, e.g. the screw, nut or rollers and/or at least a component of the bearing, e.g. the inner bearing ring or the outer bearing ring, comprises a surface part which is manufactured by means of a hard cutting operation, e.g. hard turning, hard milling, hard drilling etc.
  • the accuracy of the displacements of the actuator in response to control signals depends to a large extend on the engagement of the several surfaces of the screw mechanism and the bearings.
  • the screw threads of nut and screw and the interposed rollers, and also the raceways of the bearings play a decisive role in this respect.
  • the accuracy concerning the mutual position of these surfaces is of importance. By means of a hard cutting process, these surfaces may be integrated in the screw or nut providing an inherent accuracy, which is not influenced by accumulated manufacturing tolerances which play a role in assembled, multiple part constructions.
  • Hard turning is a single point cutting process for machining hardened steel components. It can be considered as an advantageous alternative to both rough grinding and finish grinding. Said process of hard turning is carried out by means of ceramic or superabrasive tools. It is particularly suitable for combining reduced production costs and proper finish, as only one production step is sufficient for obtaining the required finish.
  • the integrated surfaces can conveniently be manufactured by means of a multiple-spindle lathe, which offers advantages both with respect to accuracy and costs (production speed).
  • the bearing may support the screw directly or indirectly.
  • the hard turned surface part may be applied for radial support of the screw mechanism.
  • said surface part may be applied for axial support of the screw mechanism.
  • the actuator may comprise a gear reduction mechanism connected to the screw mechanism, said gear reduction mechanism, comprising a surface part which is manufactured by means of a hard cutting operation, e.g. hard turning, hard milling, hard drilling etc.
  • At least a component of the screw mechanism e.g. the screw, nut or rollers, and/or of the bearing, e.g. the inner bearing ring or the outer bearing ring, and/or of the gear reduction mechanism, may comprise a surface part which is manufactured by means of grinding.
  • At least a component of the screw mechanism e.g. the screw, nut or rollers, and/or of the bearing, e.g. the inner bearing ring or the outer bearing ring, and/or of the gear reduction mechanism, may comprise a surface part which is manufactured by means of broaching.
  • a groove for accommodating a seal or shield may be manufactured in the inner ring and/or the outer ring.
  • the nut or screw may be provided in this way with drive means, e.g. splines, gears or teeth, for direct or indirect engagement with a drive source.
  • At least one of the components may comprise a surface part, e.g. a screw thread, which is obtained by the subsequent manufacturing steps of cold forging, and/or cold rolling, soft turning, and hardening followed by hard turning.
  • a surface part e.g. a screw thread
  • At least part of at least one of the components e.g. the functional surfaces such as bearing raceway may be treated for surface modification, e.g. by lapping or by applying a diamond-like coating.
  • at least part of at least one of the components may be obtained from a sintered powder material.
  • At least part of at least one of the components may comprise a through- or case-hardened material obtained by a quenching process using oil, salt or spray quenching techniques or surface hardening using coating techniques.
  • At least part of at least one of the components may be treated by induction surface hardening using polymer or spray quenching techniques.
  • the bearing in question may be a four-point contact ball bearing or a roller bearing e.g. a cylindrical needle or taper roller bearing.
  • the reduction gear mechanism may engage either the screw or nut of the screw mechanism.
  • the screw or nut may comprise a (additional) raceway for a reduction gear means support bearing, said reduction gear means engaging both the screw mechanism and a drive source.
  • the nut is rotatably supported with respect to the housing by means of a rolling element bearing, the inner ring of said bearing forming a unity with the nut or engaging a reference face on the nut.
  • the screw is rotatably supported with respect to the housing by means of a rolling element bearing, the inner ring of said bearing forming a unity with the nut or engaging a reference face on the nut.
  • the invention is also related to a method for manufacturing an actuator according to any of the preceding claims, said actuator comprising a housing, a motor, an actuating member and a screw mechanism providing a linear movement of the actuating member with respect to the housing in response to a rotational movement of the motor, said screw mechanism comprising a screw and a nut one of which is rotatably supported with respect to the housing by means of a rolling element bearing, said rolling element bearing having an inner raceway and an outer raceway, as well as rolling elements which are in rolling contact with said raceways.
  • said method comprises the step of manufacturing a surface part of at least a component of the screw mechanism, e.g. the screw, nut, cage, cam, roller or ball, and/or of the bearing, e.g. the inner bearing ring or the outer bearing ring, by means of a hard cutting operation, e.g. hard turning, hard milling, hard drilling etc.
  • said method may comprise the step of manufacturing a surface part of at least a component of the gear reduction mechanism by means of a hard cutting operation, e.g. hard turning, hard milling, hard drilling etc.
  • a hard cutting operation e.g. hard turning, hard milling, hard drilling etc.
  • the method may comprise the step of manufacturing a surface part of at least a component of the screw mechanism, e.g. the screw, nut, cage, cam, roller or ball, and/or of the bearing, e.g. the inner bearing ring or the outer bearing ring, and/or of the reduction gear mechanism, by means of grinding.
  • a component of the screw mechanism e.g. the screw, nut, cage, cam, roller or ball
  • the bearing e.g. the inner bearing ring or the outer bearing ring, and/or of the reduction gear mechanism
  • the method may comprise the step of manufacturing a surface part of at least a component of the screw mechanism, e.g. the screw, nut or roller, and/or of the bearing, e.g. the inner bearing ring or the outer bearing ring and/or of the gear reduction mechanism, by means of broaching, and/or the step of manufacturing an inner raceway for said bearing, or a reference face for an inner bearing ring, in at least the screw or the nut.
  • the screw mechanism e.g. the screw, nut or roller
  • the bearing e.g. the inner bearing ring or the outer bearing ring and/or of the gear reduction mechanism
  • the hard cutting operation can be carried out by means of a cutting head having at least two simultaneously active cutting tips.
  • a cutting tool with multiple cutting tips By applying a cutting tool with multiple cutting tips, a rapid manufacturing operation is made possible.
  • Figure 1 shows part of a first embodiment of the screw actuator.
  • Figure 2 shows part of a second embodiment of the screw actuator.
  • the actuator shown in figure 1 comprises a nut 1, which by means of bearing 2 is rotatably supported in housing part 3. By means of rollers 4, the nut engages a screw 5. By rotating nut 1, screw 5 is displaced in axial direction.
  • the rollers are accommodated in a cage 30, as is known per se.
  • several surfaces of this actuator have been manufactured by means of a hard cutting operation.
  • the raceway 6 of the bearing 2, which raceway 6 is integrated in the nut 1 is obtained by a hard turning operation.
  • the screw thread 7 of the screw can be manufactured by a hard cutting operation.
  • the rollers 4 and the internal screwthread of the nut can be obtained in this way.
  • the nut may comprise a further raceway 8, also provided by means of a hard turning operation.
  • This raceway 8 can be used for a needle bearing, e.g. for supporting further actuator parts such as a reduction gear mechanism.
  • the actuator according to figure 2 comprises a housing 10 which carries the thrust bearing 11.
  • the thrust bearing 11 supports a sleeve 12, connected to tooth gear 13 which is driven by a gear transmission e.g. bevel gear 14.
  • Gear 14 is connected to a motor (not shown) by means of shaft 15.
  • the sleeve 12 in turn is connected to screw 16.
  • This screw 16 can be rotated by means of the gear wheels 13, 14, but cannot move axially.
  • Piston 20 has an external, axial groove 21, engaging a projection 22 accommodating in housing 10.
  • piston 20, and thereby nut 17, is able to move axially, but cannot rotate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

L'actionneur de l'invention est constitué d'un carter (1, 10), d'un moteur, d'un élément actionneur, et d'un mécanisme à vis. Ce mécanisme à vis imprime à l'élément actionneur un mouvement linéaire par rapport au carter (1, 10) en réaction au mouvement de rotation du moteur. Le mécanisme à vis comporte une vis (5, 16) et un écrou (1, 17), l'un au moins d'entre eux étant supporté rotatif par rapport au carter (1, 10) au moyen d'un roulement à rouleaux (2, 11). Ce roulement à rouleaux (2, 11) comporte d'une part un chemin de roulement (6) intérieur et un chemin de roulement (6) extérieur, et d'autre part des rouleaux de roulement en contact de roulement avec les chemins de roulement considérés. L'un au moins des éléments du mécanisme à vis, à savoir la vis (5, 16), l'écrou (1, 17) ou les rouleaux de roulement (4, 16), et/ou l'un au moins des composants du roulement (2, 11), à savoir la bague de palier intérieur ou la bague de palier extérieur, comporte une surface qui est usinée par décolletage, à savoir, au tour, à la fraise, ou au foret.
EP99910863A 1998-03-13 1999-03-12 Actionneur a precision renforcee Withdrawn EP1062721A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL1008593A NL1008593C2 (nl) 1998-03-13 1998-03-13 Actuator met verbeterde nauwkeurigheid.
NL1008593 1998-03-13
PCT/NL1999/000139 WO1999046847A1 (fr) 1998-03-13 1999-03-12 Actionneur a precision renforcee

Publications (1)

Publication Number Publication Date
EP1062721A1 true EP1062721A1 (fr) 2000-12-27

Family

ID=19766743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99910863A Withdrawn EP1062721A1 (fr) 1998-03-13 1999-03-12 Actionneur a precision renforcee

Country Status (7)

Country Link
EP (1) EP1062721A1 (fr)
JP (1) JP2002506954A (fr)
KR (1) KR20010041863A (fr)
CN (1) CN1296660A (fr)
AU (1) AU2962999A (fr)
NL (1) NL1008593C2 (fr)
WO (1) WO1999046847A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19818157B4 (de) * 1998-04-23 2012-05-16 Robert Bosch Gmbh Elektromechanische Radbremsvorrichtung
JP3555844B2 (ja) 1999-04-09 2004-08-18 三宅 正二郎 摺動部材およびその製造方法
US6969198B2 (en) 2002-11-06 2005-11-29 Nissan Motor Co., Ltd. Low-friction sliding mechanism
JP4863152B2 (ja) 2003-07-31 2012-01-25 日産自動車株式会社 歯車
US7771821B2 (en) 2003-08-21 2010-08-10 Nissan Motor Co., Ltd. Low-friction sliding member and low-friction sliding mechanism using same
JP6045372B2 (ja) * 2013-01-29 2016-12-14 株式会社スギノマシン 電動湿式微粒化装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1546382A (en) * 1976-06-16 1979-05-23 Ti Matrix Ltd Abrasive machining
US4804073A (en) * 1980-12-23 1989-02-14 Allied-Signal Inc. Electrically operated disc brake with back-off protector
US5251510A (en) * 1991-09-17 1993-10-12 Dana Corporation Ring gear fixture and machining process therefor
DE19511287B4 (de) * 1994-07-21 2004-05-06 Continental Teves Ag & Co. Ohg Elektromechanische betätigbare Scheibenbremse
DE4430113A1 (de) * 1994-08-25 1996-02-29 Berliner Werkzeugmasch Werkzeugmaschine
DE19546863A1 (de) * 1994-12-21 1996-06-27 Komet Stahlhalter Werkzeug Verfahren und Vorrichtung zur Endbearbeitung gehärteter Werkstücke
ES2151976T3 (es) * 1995-05-19 2001-01-16 Continental Ag Actuador de freno para un freno de accionamiento electrico de vehiculo.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9946847A1 *

Also Published As

Publication number Publication date
NL1008593C2 (nl) 1999-09-14
CN1296660A (zh) 2001-05-23
WO1999046847A1 (fr) 1999-09-16
KR20010041863A (ko) 2001-05-25
AU2962999A (en) 1999-09-27
JP2002506954A (ja) 2002-03-05

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