WO2003048599A1 - Twin screw actuator - Google Patents

Twin screw actuator Download PDF

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Publication number
WO2003048599A1
WO2003048599A1 PCT/IB2002/005175 IB0205175W WO03048599A1 WO 2003048599 A1 WO2003048599 A1 WO 2003048599A1 IB 0205175 W IB0205175 W IB 0205175W WO 03048599 A1 WO03048599 A1 WO 03048599A1
Authority
WO
WIPO (PCT)
Prior art keywords
screws
housing
actuator according
screw
screw actuator
Prior art date
Application number
PCT/IB2002/005175
Other languages
French (fr)
Inventor
Henk Kapaan
Koos Zwarts
Original Assignee
Skf Industrie S.P.A.
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 Industrie S.P.A. filed Critical Skf Industrie S.P.A.
Priority to AU2002351138A priority Critical patent/AU2002351138A1/en
Publication of WO2003048599A1 publication Critical patent/WO2003048599A1/en

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
    • 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
    • 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
    • F16D2125/405—Screw-and-nut with differential thread
    • 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
    • F16D2125/48—Rotating members in mutual engagement with parallel stationary axes, e.g. spur 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
    • F16H2025/2059—Superposing movement by two screws, e.g. with opposite thread direction
    • 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
    • F16H2025/2062—Arrangements for driving the actuator
    • F16H2025/2075—Coaxial drive 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
    • 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
    • F16H2025/2062—Arrangements for driving the actuator
    • F16H2025/2075—Coaxial drive motors
    • F16H2025/2078—Coaxial drive motors the rotor being integrated with the nut or screw body
    • 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
    • F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • H02K1/2733—Annular magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor

Definitions

  • the invention is related to the field of screw actuators .
  • Such actuators are applied in various fields, for instance in the automotive field for actuating brakes, clutches,- gearboxes etc .
  • the object of the invention is to provide a versatile screw actuator which fits a wide range of applications.
  • a screw actuator comprising a nut member having two coaxial, separate and different screw threads, and two screws which each have a different screw thread corresponding to screw threads of the nut member, at least one of said screws at its end facing away from the other screw having an actuating head, a housing and drive means for rotating the nut member and the screws with respect to each other.
  • the actuator according to the invention comprises a single nut and two screws .
  • This layout has a compactness which is required for applications such as in brake discs, and also offers further desired possibilities which are addressed below.
  • the drive motor has a stator which is connected to the housing, and the rotor which engages the nut member, e.g. through a gear reduction means.
  • the screws are coupled in rotational direction, so as to obtain a uniform control thereof through the nut.
  • the screws at there facing ends are coupled through a spline connection.
  • the screws at their facing ends are preloaded by a compression spring.
  • the screws are each supported with respect to the nut member by means of a bearing, e.g. a plai bearing, a needle bearing.
  • the nut is supported with respect to the housing by- means of at least one rolling element bearing, or supported on the screws by means of a plain bearing or a needle bearing.
  • the rotor is supported with respect to the nut by means of a bearing, e.g. a plain bearing or a needle bearing.
  • both screws extend from the housing, and both have an actuating head at their ends facing away from each other.
  • This embodiment can e.g. be applied in a clutch or a brake.
  • one of the screws is axially fixedly supported with respect to the housing, the nut member being translatably but non-rotably guided with respect to the housing.
  • the motor and the nut member are accommodated in a sub-housing, said sub-housing being slideable in axial direction with respect to the housing.
  • This embodiment is particularly suitable for actuating a gearbox.
  • the actuating end should carry out both a translating as well as a rotating movement.
  • the axially fixed screws is driveable in rotational direction by a further motor.
  • Fig. 1 shows a first embodiment of the screw actuator according to the invention, in particular for a clutch
  • Fig. 2 shows a second embodiment, in particular for a gearbox
  • Figs . 3 and 4 show a third and a fourth embodiment respectively of the invention.
  • the screw actuator shown in fig. 1 comprises a single nut 1 as well as two screws 2, 3 which have respective left hand and a right hand screw threads , 5.
  • the nut member 1 has corresponding nut sections 6, 7; the screws 2, 3 and the nut sections 6, 7 engage each other through balls 8 (ball screw) .
  • the nut member 1 is supported within a housing 9 by means of two rolling element bearings 10.
  • the screws 2, 3 have, beside the screw sections 11, 12, cylindrical sections 13, 14. These cylindrical sections 13, 14 are supported by the cylindrical parts 15, 16 of the nut member 1. These cylindrical parts 15, 16 together with the cylindrical sections 13, 14, each form a plain bearing for the respective screws 2, 3.
  • the screws 2, 3 are sealed with respect to the housing 9 by means of bellows 17.
  • the nut member 1 furthermore carries the rotor 18 of the motor 19, the stator 20 of which is connected to the housing 9.
  • the screw 2 is fixed in rotational direction with respect to the housing 9 by means of the splined/grooved connection 20.
  • the screws 2, 3 have protruding ends or actuating heads 21, 22, which each have a mounting flange 23, 24 for connecting the screw actuator to the surrounding structure.
  • the screw actuator is non-rotably held.
  • the screws 2, 3 at their facing ends each have a bore 25, within which a compression spring 26 is held. This compression spring ensures that any play will be minimised.
  • the motor 19 is energised, which makes the nut member 1 rotate with respect to the housing 9.
  • the screw members 2, 3 are displaced from or towards each other, whereby an actuating movement is exerted through the flanges 23, 24.
  • one of the screws 2 is rotatably, but not axially moveable, being supported by means of bearings 27, 28.
  • the nut member 1 and the motor 19 are accommodated within a sub-housing 29, which is axially slidable within the housing 9.
  • This housing 9 is closed at the end 30, and has a fixing flange 31 at the opposite end, for fixing the screw actuator in question to a gearbox.
  • the screws 2, 3 have bores 25 in which a key 32 is accommodated.
  • the key and the bores 25 are not round, which makes that the screws 2, 3 are axially moveable with respect to each other, but not rotatable.
  • the screws 2, 3 are preloaded by means of a spring 44.
  • the screws By energising the motor 19, the screws can be moved away from each other, whereby the nut 1 moves as well. This is made possible by the fact that the nut 1 and the motor 19 are accommodated in the sub-housing 29.
  • This sub-housing 29 is non-rotatable due to splined/grooved connection 33.
  • the screw 3 has an actuating head 22, which carries a fork 34 which is connectable to a gear lever in the gearbox (not shown) .
  • actuating head 22 which carries a fork 34 which is connectable to a gear lever in the gearbox (not shown) .
  • the fork 34 should carry out a rotating movement in order to shift gear. This is made possible by a further motor 35, the stator 36 of which is connected to the housing 9, and a rotor 37 of which is connected to the screw 2.
  • the rotor 18 of the motor is connected to a separate sleeve 39, whic by means of a bearing 38, e.g. a plain bearing, is rotatably supported with respect to the nut member 1.
  • This nut member 1 carries an outwardly protruding flange 40 with an inwardly pointing gear wheel forming part of the reduction satellite of a gear wheel mechanism 41.
  • This gear wheel mechanism 41 also engages the separate sleeve 39; thus, the rotations imparted the rotor 18 are decelerated through the gear wheel mechanism 41, so as to obtain the desired number of rotations of the nut member 1.
  • the screws 2 , 3 are supported with respect to the housing 9 by means of a plain bearing which is constituted by the cylindrical parts 13 , 14 of the screws 2, 3, and the cylindrical parts 15, 16 of the housing 9.
  • a needle bearing may be applied here.
  • a gear wheel reduction mechanism 41 is provided between the separate sleeve 39 and the nut member 1.

Landscapes

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

Abstract

A screw actuator comprises a nut member (1) having two coaxial separate and different screw threads (6, 7) and two screws (2, 3) with different screw threads (4, 5) corresponding to the screw threads of the nut member (1). At least one of the screws (2, 3), at its end facing away from the other screw, has an actuating head (21, 22). The actuator further comprises a housing (9) and a drive (19, 41) for rotating the nut member (1) and the screws (2, 3) with respect to each other.

Description

Twin screw actuator
The invention is related to the field of screw actuators . Such actuators are applied in various fields, for instance in the automotive field for actuating brakes, clutches,- gearboxes etc .
The object of the invention is to provide a versatile screw actuator which fits a wide range of applications.
This object is achieved by means of a screw actuator comprising a nut member having two coaxial, separate and different screw threads, and two screws which each have a different screw thread corresponding to screw threads of the nut member, at least one of said screws at its end facing away from the other screw having an actuating head, a housing and drive means for rotating the nut member and the screws with respect to each other.
The actuator according to the invention comprises a single nut and two screws . This layout has a compactness which is required for applications such as in brake discs, and also offers further desired possibilities which are addressed below.
The drive motor has a stator which is connected to the housing, and the rotor which engages the nut member, e.g. through a gear reduction means. Preferably, the screws are coupled in rotational direction, so as to obtain a uniform control thereof through the nut. For instance, the screws at there facing ends are coupled through a spline connection. For preventing undesirably play movements, the screws at their facing ends are preloaded by a compression spring. The screws are each supported with respect to the nut member by means of a bearing, e.g. a plai bearing, a needle bearing. The nut is supported with respect to the housing by- means of at least one rolling element bearing, or supported on the screws by means of a plain bearing or a needle bearing. The rotor is supported with respect to the nut by means of a bearing, e.g. a plain bearing or a needle bearing.
According to a first embodiment, both screws extend from the housing, and both have an actuating head at their ends facing away from each other. This embodiment can e.g. be applied in a clutch or a brake.
According to a second embodiment, one of the screws is axially fixedly supported with respect to the housing, the nut member being translatably but non-rotably guided with respect to the housing. In this case, the motor and the nut member are accommodated in a sub-housing, said sub-housing being slideable in axial direction with respect to the housing.
This embodiment is particularly suitable for actuating a gearbox. In this case, the actuating end should carry out both a translating as well as a rotating movement. To that end, the axially fixed screws is driveable in rotational direction by a further motor.
The invention will now be described in further detail with reference to several embodiments shown in the figures .
Fig. 1 shows a first embodiment of the screw actuator according to the invention, in particular for a clutch;
Fig. 2 shows a second embodiment, in particular for a gearbox;
Figs . 3 and 4 show a third and a fourth embodiment respectively of the invention.
The screw actuator shown in fig. 1 comprises a single nut 1 as well as two screws 2, 3 which have respective left hand and a right hand screw threads , 5. The nut member 1 has corresponding nut sections 6, 7; the screws 2, 3 and the nut sections 6, 7 engage each other through balls 8 (ball screw) . The nut member 1 is supported within a housing 9 by means of two rolling element bearings 10.
The screws 2, 3 have, beside the screw sections 11, 12, cylindrical sections 13, 14. These cylindrical sections 13, 14 are supported by the cylindrical parts 15, 16 of the nut member 1. These cylindrical parts 15, 16 together with the cylindrical sections 13, 14, each form a plain bearing for the respective screws 2, 3. The screws 2, 3 are sealed with respect to the housing 9 by means of bellows 17. The nut member 1 furthermore carries the rotor 18 of the motor 19, the stator 20 of which is connected to the housing 9.
The screw 2 is fixed in rotational direction with respect to the housing 9 by means of the splined/grooved connection 20. Furthermore, the screws 2, 3 have protruding ends or actuating heads 21, 22, which each have a mounting flange 23, 24 for connecting the screw actuator to the surrounding structure. By means of these mounting flanges 23, 24, the screw actuator is non-rotably held. Furthermore the screws 2, 3 at their facing ends each have a bore 25, within which a compression spring 26 is held. This compression spring ensures that any play will be minimised. In service, the motor 19 is energised, which makes the nut member 1 rotate with respect to the housing 9. Depending on the rotational sense of the nut member 1, the screw members 2, 3 are displaced from or towards each other, whereby an actuating movement is exerted through the flanges 23, 24.
In the embodiment of fig. 2, one of the screws 2 is rotatably, but not axially moveable, being supported by means of bearings 27, 28. The nut member 1 and the motor 19 are accommodated within a sub-housing 29, which is axially slidable within the housing 9. This housing 9 is closed at the end 30, and has a fixing flange 31 at the opposite end, for fixing the screw actuator in question to a gearbox.
At their facing ends, the screws 2, 3 have bores 25 in which a key 32 is accommodated. The key and the bores 25 are not round, which makes that the screws 2, 3 are axially moveable with respect to each other, but not rotatable. The screws 2, 3 are preloaded by means of a spring 44.
By energising the motor 19, the screws can be moved away from each other, whereby the nut 1 moves as well. This is made possible by the fact that the nut 1 and the motor 19 are accommodated in the sub-housing 29. This sub-housing 29 is non-rotatable due to splined/grooved connection 33.
The screw 3 has an actuating head 22, which carries a fork 34 which is connectable to a gear lever in the gearbox (not shown) . By moving the screw 3 back and forth, the switching translation for a gearbox can be obtained.
Also, the fork 34 should carry out a rotating movement in order to shift gear. This is made possible by a further motor 35, the stator 36 of which is connected to the housing 9, and a rotor 37 of which is connected to the screw 2.
By energising the motor, the screw 2, and thus the screw 3 through spline connection 25, 32 as well as the sub-housing 29 are rotated in the desirable sense, thus rotating the fork 34 of the screw 3, whereby the desired gear shifting rotation is obtained.
In the embodiment of fig. 3, which to a large extent resembles the embodiment of fig. 1, the rotor 18 of the motor is connected to a separate sleeve 39, whic by means of a bearing 38, e.g. a plain bearing, is rotatably supported with respect to the nut member 1. This nut member 1 carries an outwardly protruding flange 40 with an inwardly pointing gear wheel forming part of the reduction satellite of a gear wheel mechanism 41. This gear wheel mechanism 41 also engages the separate sleeve 39; thus, the rotations imparted the rotor 18 are decelerated through the gear wheel mechanism 41, so as to obtain the desired number of rotations of the nut member 1.
As in the embodiment of fig. 1, the screws 2 , 3 are supported with respect to the housing 9 by means of a plain bearing which is constituted by the cylindrical parts 13 , 14 of the screws 2, 3, and the cylindrical parts 15, 16 of the housing 9. In alternative, also a needle bearing may be applied here.
In the embodiment of fig. 4, no such bearings are provided between the screws 2, 3 and housing 9; instead, seals 42 have been provided to ensure the desired sealing function. The mechanism is now supported by means of deep groove ball bearings 43, which are positioned between the housing 9 and the separated sleeve 39 which carries the rotor 18 of the motor. In turn, the separate sleeve 39, through the plain bearing or needle bearing 38, supports the nut member 1, which in turn supports the screws 2, 3 through the cylindrical parts 15, 16.
Again, a gear wheel reduction mechanism 41 is provided between the separate sleeve 39 and the nut member 1.

Claims

1. A screw actuator comprising a nut member (1) having two coaxial separate and different screw threads (6, 7), and two screws (2, 3) which each have a different screw thread (4, 5) corresponding to the screw threads of the nut member, at least one of said screws (2, 3) at its end facing away from the other screw having an actuating head (21, 22), a housing (9) and drive means (19, 41) for rotating the nut member (1) and the screws (2, 3) with respect to each other.
2. A screw actuator according to claim 1, wherein the drive means comprise a motor (19) , the stator (20) of which is connected to the housing (9) , and the rotor (18) of which engages the nut member (1) .
3. A screw actuator according to claim 2 , wherein the rotor (18) engages the nut member (1) through a gear reduction means (41) .
4. A screw actuator according to one of the preceding claims, wherein the screws (2, 3) are coupled in rotational direction.
5. A screw actuator according to claim 4 , wherein the screws (2, 3) at their facing ends are coupled through a spline connection (25, 32) .
6. A screw actuator according to any of the preceding claims, wherein the screws (2, 3) at their facing ends are preloaded by a compression spring (26) .
7. A screw actuator according to any of the preceding claims, wherein at least one of the screws (2, 3) is a ball screw.
8. A screw actuator according to any of the preceding claims, wherein the screws (2, 3) are supported with respect to the nut member (1) by means of a bearing (13, 15; 14, 16) , e.g. a plain bearing, or a needle bearing.
9. A screw actuator according to any of the preceding claims, wherein the nut (1) is supported with respect to the housing (9) by means of at least one rolling element bearing (10).
10. A screw actuator according to any of the preceding claims, wherein the rotor (18) is supported with respect to the nut (1) by means of a bearing (38) , e.g. a plain bearing or a needle bearing.
11. A screw actuator according to any of claims 1 to 9, wherein the rotor (18) is carried by a separate sleeve (38) which is supported with respect to the housing (9) by means of rolling element bearings (43) .
12. A screw actuator according to any of the preceding claims, wherein both screws (2, 3) extend from the housing, and both have an actuating head (21, 22) at their ends facing away from each other.
13. A screw actuator according to any of the preceding claims, wherein the screws (2, 3) are supported with respect to the housing (9) by means of bearings (44, 45), e.g. plain bearings or needle bearings .
14. A screw actuator according to claim 1 to 10, wherein one of the screws (2) is axially fixedly supported with respect to the housing (9) , the nut member (1) being translatably but non-rotatably guided with respect to the housing (9) .
15. A screw actuator according to claim 14, wherein the motor (19) and the nut member (1) are accommodated in a sub- housing (29) , said sub-housing (29) being slidable in axial direction with respect to the housing (9) .
• 16. A screw actuator according to claim 14 or 15, wherein the axially fixed screw (2) is driveable in rotational direction by a further motor (35) .
PCT/IB2002/005175 2001-12-07 2002-12-06 Twin screw actuator WO2003048599A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002351138A AU2002351138A1 (en) 2001-12-07 2002-12-06 Twin screw actuator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO2001A001137 2001-12-07
IT2001TO001137A ITTO20011137A1 (en) 2001-12-07 2001-12-07 DOUBLE SCREW ACTUATOR.

Publications (1)

Publication Number Publication Date
WO2003048599A1 true WO2003048599A1 (en) 2003-06-12

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Application Number Title Priority Date Filing Date
PCT/IB2002/005175 WO2003048599A1 (en) 2001-12-07 2002-12-06 Twin screw actuator

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AU (1) AU2002351138A1 (en)
IT (1) ITTO20011137A1 (en)
WO (1) WO2003048599A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004059189A1 (en) * 2002-12-20 2004-07-15 Continental Teves Ag & Co. Ohg Electromechanically-operated parking brake
WO2006128759A1 (en) * 2005-06-02 2006-12-07 Robert Bosch Gmbh Parking drum brake
WO2014173667A1 (en) 2013-04-24 2014-10-30 Sonceboz Sa Electric actuator with threaded rod
EP3467347A1 (en) * 2017-10-03 2019-04-10 Hamilton Sundstrand Corporation Linear actuator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1148523A (en) * 1965-05-05 1969-04-16 Girling Ltd Improvements in or relating to brake mechanisms
WO2001042677A1 (en) * 1999-12-07 2001-06-14 Skf Engineering & Research Centre B.V. Drum brake and electric actuator therefore
WO2001051825A1 (en) * 2000-01-14 2001-07-19 Skf Engineering And Research Centre B.V. Actuator unit and brake calliper

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1148523A (en) * 1965-05-05 1969-04-16 Girling Ltd Improvements in or relating to brake mechanisms
WO2001042677A1 (en) * 1999-12-07 2001-06-14 Skf Engineering & Research Centre B.V. Drum brake and electric actuator therefore
WO2001051825A1 (en) * 2000-01-14 2001-07-19 Skf Engineering And Research Centre B.V. Actuator unit and brake calliper

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004059189A1 (en) * 2002-12-20 2004-07-15 Continental Teves Ag & Co. Ohg Electromechanically-operated parking brake
WO2006128759A1 (en) * 2005-06-02 2006-12-07 Robert Bosch Gmbh Parking drum brake
WO2014173667A1 (en) 2013-04-24 2014-10-30 Sonceboz Sa Electric actuator with threaded rod
US10502293B2 (en) 2013-04-24 2019-12-10 Sonceboz Sa Electric actuator with threaded rod
EP3467347A1 (en) * 2017-10-03 2019-04-10 Hamilton Sundstrand Corporation Linear actuator
US10837532B2 (en) 2017-10-03 2020-11-17 Hamilton Sunstrand Corporation Linear actuator

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ITTO20011137A0 (en) 2001-12-07
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