US20050188687A1 - Actuator - Google Patents

Actuator Download PDF

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Publication number
US20050188687A1
US20050188687A1 US11/060,096 US6009605A US2005188687A1 US 20050188687 A1 US20050188687 A1 US 20050188687A1 US 6009605 A US6009605 A US 6009605A US 2005188687 A1 US2005188687 A1 US 2005188687A1
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US
United States
Prior art keywords
drive
hydraulic
actuator
pneumatic
movement
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.)
Abandoned
Application number
US11/060,096
Inventor
Joerg Meyer
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.)
Liebherr Aerospace Lindenberg GmbH
Original Assignee
Liebherr Aerospace Lindenberg 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
Application filed by Liebherr Aerospace Lindenberg GmbH filed Critical Liebherr Aerospace Lindenberg GmbH
Assigned to LIEBHERR-AEROSPACE LINDENBERG GMBH reassignment LIEBHERR-AEROSPACE LINDENBERG GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MEYER, JOERG
Publication of US20050188687A1 publication Critical patent/US20050188687A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
    • F15B15/068—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the helical type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/004—Fluid pressure supply failure

Abstract

This invention relates to an actuator which consists of a hydraulic or pneumatic drive, which in accordance with the invention is combined with an electromechanical drive in one constructional unit, the hydraulic or pneumatic drive being the normal drive of the actuator and the electromechanical drive being used for an alternative actuation of the actuator.

Description

  • This invention relates to an actuator which consists of a hydraulic or pneumatic drive. Actuators employed in aircraft systems must satisfy particular safety standards. In conventional systems, in which the actuators are actuated by hydraulic or pneumatic drives, parallel second hydraulic or pneumatic systems for actuating the actuators are provided for an alternative actuation in the case of a failure of the first system, in order to maintain the operability of the aircraft system. Providing a second hydraulic or pneumatic system for each actuator is costly and expensive. In addition, these drives are also heavy, which is disadvantageous in particular when using the same as component of an aircraft system. When two parallel hydraulic or pneumatic systems are used, there can also occur a total functional loss of the actuator unit, for instance when the piston gasket in the actuator is defective.
  • Therefore, it is the object of the present invention to provide an actuator with improved functional safety, which is more compact and thus of a lighter design.
  • In accordance with the invention, this object is solved by the features of claim 1. In an actuator which consists of a hydraulic or pneumatic drive, an electromechanical drive is combined in one constructional unit as alternative drive, the hydraulic or pneumatic drive being the normal drive of the actuator, and the electromechanical drive being used for an alternative actuation of the actuator. This alternative actuation only comes into effect, when the hydraulic or pneumatic first drive fails. By combining the hydraulic or pneumatic drive with the electromechanical drive on the one hand and by integrating the same in one constructional unit, i.e. in one device, on the other hand, a particularly compact and lightweight actuator unit is created, which is suited in particular for use in flight control systems. Advantageous aspects of the invention can be taken from the sub-claims.
  • Accordingly, the electromechanical drive can be arranged in series with the hydraulic or pneumatic drive. Alternatively, the electromechanical drive can be arranged parallel to the hydraulic or pneumatic drive.
  • The electromechanical drive can loosely be connected with the hydraulic or pneumatic drive, performing no movement in normal operation and being actuatable only for the alternative movement. On the other hand, the electromechanical drive can firmly be connected with the hydraulic or pneumatic drive, performing the movement of the hydraulic or pneumatic drive without load, i.e. passively, in normal operation and being actuatable as active drive only for the alternative movement.
  • Further features, details and advantages can be taken from the embodiments which are illustrated schematically in the drawing, in which:
  • FIG. 1 shows a first, purely schematically illustrated embodiment of the actuator in accordance with the invention, and
  • FIG. 2 shows a second embodiment of the actuator in accordance with the invention in a schematic representation.
  • In FIG. 1, an actuator 10 is shown purely schematically. Said actuator 10 includes any component 12 movable in and against the direction of arrow, which is normally movable via a hydraulic or pneumatic drive 14 which here likewise is shown only schematically.
  • In the embodiment as shown in FIG. 1, an electromechanical drive 16 is disposed in series with said hydraulic or pneumatic drive 14, which centrally includes a spindle or toothed rack 18 which can be actuated via an electric motor 20 and a transmission 22 coupled thereto.
  • FIG. 1 does not show in detail how the electromechanical drive 16 is connected with the hydraulic or pneumatic drive 14 and how these two drives are connected with the actuating means 12. This can be effected in a manner known to those skilled in the art. The electromechanical drive can loosely be connected with the hydraulic or pneumatic drive, performing no movement in normal operation and being actuatable only for the alternative movement. Alternatively, the electromechanical drive 16 can also firmly be connected with the hydraulic or pneumatic drive 14, the electromechanical drive 16 performing the movement of the hydraulic or pneumatic drive in normal operation and being actuatable as active drive only for the alternative movement.
  • FIG. 2 shows an alternative embodiment, which basically corresponds to the one shown in FIG. 1. In this case, however, the electromechanical drive 16 is not arranged in series with, but parallel to the hydraulic or pneumatic drive 14. The remaining functions can be realized similar to the embodiment as shown in FIG. 1.
  • What is essential in the embodiments as shown in FIGS. 1 and 2 is the fact that the hydraulic and pneumatic drive units are realized in combination with the electromechanical drive unit in one constructional unit, i.e. in one device. As a result, a second hydraulic or pneumatic system can be omitted, the absolute separation of two systems still being ensured. The actuator in accordance with the invention is of light weight, as fewer tubes, less oil volume and the like must be provided here. Safety also is increased, as for instance in the case of a defective piston gasket in the actuator, the actuator still can be actuated due to the presence of the electromechanical drive unit 16.

Claims (9)

1. An actuator, comprising a hydraulic or pneumatic drive, characterized in that
it is combined with an electromechanical drive in one constructional unit, the hydraulic or pneumatic drive being the normal drive of the actuator and the electromechanical drive being used for an alternative actuation of the actuator.
2. The actuator as claimed in claim 1, characterized in that the electromechanical drive is arranged in series with the hydraulic or pneumatic drive.
3. The actuator as claimed in claim 1, characterized in that the electromechanical drive is arranged parallel to the hydraulic or pneumatic drive.
4. The actuator as claimed in claim 1, characterized in that the electromechanical drive is loosely connected with the hydraulic or pneumatic drive, performing no movement in normal operation and being actuatable only for the alternative movement.
5. The actuator as claimed in claim 1, characterized in that the electromechanical drive is firmly connected with the hydraulic or pneumatic drive, performing the movement of the hydraulic or pneumatic drive without load in normal operation and being actuatable as active drive only for the alternative movement.
6. The actuator as claimed in claim 2, characterized in that the electromechanical drive is loosely connected with the hydraulic or pneumatic drive, performing no movement in normal operation and being actuatable only for the alternative movement.
7. The actuator as claimed in claim 3, characterized in that the electromechanical drive is loosely connected with the hydraulic or pneumatic drive, performing no movement in normal operation and being actuatable only for the alternative movement.
8. The actuator as claimed in claim 2, characterized in that the electromechanical drive is firmly connected with the hydraulic or pneumatic drive, performing the movement of the hydraulic or pneumatic drive without load in normal operation and being actuatable as active drive only for the alternative movement.
9. The actuator as claimed in claim 3, characterized in that the electromechanical drive is firmly connected with the hydraulic or pneumatic drive, performing the movement of the hydraulic or pneumatic drive without load in normal operation and being actuatable as active drive only for the alternative movement.
US11/060,096 2004-02-17 2005-02-17 Actuator Abandoned US20050188687A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004007667.7 2004-02-17
DE102004007667A DE102004007667B4 (en) 2004-02-17 2004-02-17 actuator

Publications (1)

Publication Number Publication Date
US20050188687A1 true US20050188687A1 (en) 2005-09-01

Family

ID=34684087

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/060,096 Abandoned US20050188687A1 (en) 2004-02-17 2005-02-17 Actuator

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US (1) US20050188687A1 (en)
EP (1) EP1564417A1 (en)
DE (1) DE102004007667B4 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9283949B2 (en) 2014-07-22 2016-03-15 Google Inc. Hybrid hydraulic and electrically actuated mobile robot

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2660026A (en) * 1952-12-05 1953-11-24 Gen Motors Corp Dual drive actuator
US6241182B1 (en) * 1998-04-29 2001-06-05 Aerospatiale Societe Nationale Industrielle Hybrid control system for an aircraft aerodynamic surface
US6637314B2 (en) * 2001-01-30 2003-10-28 Smc Kabushiki Kaisha Actuator
US6755375B2 (en) * 2002-10-22 2004-06-29 The Boeing Company Method and apparatus for controlling aircraft devices with multiple actuators

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688951A (en) * 1951-12-28 1954-09-14 Cleveland Pneumatic Tool Co Pressure fluid motor
GB733840A (en) * 1952-12-05 1955-07-20 Gen Motors Corp Improved actuator
US2730994A (en) * 1953-02-24 1956-01-17 Gen Motors Corp Actuator control system and valve mechanism therefor
CH378127A (en) * 1962-05-29 1964-05-31 Fleury Claude Device for controlling the movement of a machine component
US4876906A (en) * 1986-11-20 1989-10-31 Sundstrand Corporation Non-jamming actuator system
IT1285781B1 (en) * 1996-10-11 1998-06-18 Giacomo Bardoni ELECTRO-PNEUMATIC ACTUATOR

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2660026A (en) * 1952-12-05 1953-11-24 Gen Motors Corp Dual drive actuator
US6241182B1 (en) * 1998-04-29 2001-06-05 Aerospatiale Societe Nationale Industrielle Hybrid control system for an aircraft aerodynamic surface
US6637314B2 (en) * 2001-01-30 2003-10-28 Smc Kabushiki Kaisha Actuator
US6755375B2 (en) * 2002-10-22 2004-06-29 The Boeing Company Method and apparatus for controlling aircraft devices with multiple actuators

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9283949B2 (en) 2014-07-22 2016-03-15 Google Inc. Hybrid hydraulic and electrically actuated mobile robot
US9937618B2 (en) 2014-07-22 2018-04-10 Boston Dynamics, Inc. Hybrid hydraulic and electrically actuated mobile robot

Also Published As

Publication number Publication date
DE102004007667A1 (en) 2005-09-01
DE102004007667B4 (en) 2005-12-29
EP1564417A1 (en) 2005-08-17

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Legal Events

Date Code Title Description
AS Assignment

Owner name: LIEBHERR-AEROSPACE LINDENBERG GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MEYER, JOERG;REEL/FRAME:016550/0824

Effective date: 20050415

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION