EP1273805B1 - Hydraulic force-multiplying actuator - Google Patents

Hydraulic force-multiplying actuator Download PDF

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Publication number
EP1273805B1
EP1273805B1 EP01124741A EP01124741A EP1273805B1 EP 1273805 B1 EP1273805 B1 EP 1273805B1 EP 01124741 A EP01124741 A EP 01124741A EP 01124741 A EP01124741 A EP 01124741A EP 1273805 B1 EP1273805 B1 EP 1273805B1
Authority
EP
European Patent Office
Prior art keywords
actuator
pad
stem
flange
multiplying
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.)
Expired - Lifetime
Application number
EP01124741A
Other languages
German (de)
French (fr)
Other versions
EP1273805A3 (en
EP1273805A2 (en
Inventor
Fretta Roberto
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.)
OMG SRL
Original Assignee
OMG SRL
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 OMG SRL filed Critical OMG SRL
Publication of EP1273805A2 publication Critical patent/EP1273805A2/en
Publication of EP1273805A3 publication Critical patent/EP1273805A3/en
Application granted granted Critical
Publication of EP1273805B1 publication Critical patent/EP1273805B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/088—Characterised by the construction of the motor unit the motor using combined actuation, e.g. electric and fluid actuation
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/032—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters
    • F15B11/0325—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of fluid-pressure converters the fluid-pressure converter increasing the working force after an approach stroke
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B2015/1495—Characterised by the construction of the motor unit of the straight-cylinder type with screw mechanism attached to the piston
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/216—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being pneumatic-to-hydraulic converters
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/76—Control of force or torque of the output member

Definitions

  • the present invention refers to an hydraulic force-multiplying actuator.
  • actuators are known in the art, both of the electromechanical and of the hydraulic types (for example, US-A-4 288 987 and PATENT ABSTRACTS OF JAPAN vol. 2000, no. 08, 6 October 2000 & JP 2000 141092A, 23 May 2000). These latter ones have recently provided a better solution from the point of view of increasing the force with variable multiplication ratios upon their dimensioning.
  • An example of a known actuator allows obtaining multiplication ratios that vary from at least two up to a maximum of five times the recirculating screw reaction. It is thereby possible to use screws into a constructive range of standard sizes and loads and parking and operating brakes that are sized even only for 1/5 of the maximum provided force.
  • This type of electro-hydro-mechanical force-intensifying actuator has the further advantage of being of a construction shape that is not unlike the shape of an hydraulic cylinder and it is able to replace this latter one without excessive modifications in the existing machine structures.
  • the above-described actuator has two substantial types of problems: first of all, it is equipped with an actuating spring, which does not show a constant reaction pressure, but rather a pressure accumulation and therefore does not perform a constant-force stroke, and after a time tends to lose its own functionalities: moreover, its replacement, in case of need, forces the whole actuator to be disassembled, with obvious problems of times and costs.
  • actuating spring which does not show a constant reaction pressure, but rather a pressure accumulation and therefore does not perform a constant-force stroke, and after a time tends to lose its own functionalities: moreover, its replacement, in case of need, forces the whole actuator to be disassembled, with obvious problems of times and costs.
  • actuating spring which does not show a constant reaction pressure, but rather a pressure accumulation and therefore does not perform a constant-force stroke, and after a time tends to lose its own functionalities: moreover, its replacement, in case of need, forces the whole actuator to be disassembled, with obvious problems of times and costs.
  • Object of the present invention is solving the above prior-art problems, by providing an hydraulic force-multiplying actuator that is not equipped with a spring but with an air piston, that provides a constant reaction pressure and performs a constant stroke; such arrangement with an adjustable pneumatic piston further allows doing without the oleodynamic unit that was one of the limits of the previous actuator.
  • a further object of the present invention is providing an actuator of the above-mentioned type that allows obtaining multiplication ratios that are up to 25, that are much more suitable for nowadays applications on machines.
  • the hydraulic actuator of the present invention substantially comprises, as its major feature, adjustable pneumatic reaction means 60 that are composed of a compressed-air piston supplied through a duct 52 and that operates on the actuator body in order to exert a constant reaction pressure and to perform a constant-force stroke.
  • adjustable pneumatic reaction means 60 that are composed of a compressed-air piston supplied through a duct 52 and that operates on the actuator body in order to exert a constant reaction pressure and to perform a constant-force stroke.
  • Such pneumatic piston 60 replaces the spring that was commonly used in known actuators of this type.
  • the actuator of the invention is further equipped with a shoulder 50 in the working area, such shoulder 50 allowing the operating oil (supplied through the duct 54) to operate in a gradual increase in the working area in order to speed-up and improve the actuator operability.
  • the actuator of the invention can be equipped, differently from known actuators, with at least one element 11 that is adapted to prevent the pad of the reaction means 60 from rotating: in practice, such elements 11 are two and are composed of rotation-preventing studs.
  • the actuator then comprises, in a known way, normal component parts that are, in detail, the following ones: a pad 1, a stem 2, an head 3, a liner 4, a liner flange 5, a pad support 6, a stem flange 7, a multiplying flange 8, a pneumatic liner 9, a pneumatic head 10, a spindle 12, a spacer 13, an internal spacer 14, a lower spacer 15, a bearing capsule 16, a recirculation screw 18, a screw spacer 19, a padded flange 20, a driven pulley 21, a "n-pur” 22, a "nipsl 310" 23, a 4312 O-ring 24, a "pt1" 25, a "t 20" 26, an "oms - mr" 27, a guiding band 31, an "omk-e” 32, a guiding band 33, an "omk-e” 34, a "pt1" 35, a "pu6” 36, a ring nut
  • the actuator of the invention finds its most efficient application in the field of pressings, and in particular in the field of material forming and cutting, without having to use screws and toggles and allowing to perform both workings in a single operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)
  • Vehicle Body Suspensions (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)
  • Braking Systems And Boosters (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Servomotors (AREA)

Abstract

An hydraulic force-multiplying actuator is disclosed comprising adjustable pneumatic reaction means (60) adapted to exert a constant reaction pressure and to perform a constant-force stroke, and supplied by compressed-air supplying ducts (52); the actuator further comprises a shoulder (50) for the oil in the working area, and at least one element (11) adapted to prevent the pad of the reaction means (60) from rotating. <IMAGE>

Description

  • The present invention refers to an hydraulic force-multiplying actuator.
  • Different types of actuators are known in the art, both of the electromechanical and of the hydraulic types (for example, US-A-4 288 987 and PATENT ABSTRACTS OF JAPAN vol. 2000, no. 08, 6 October 2000 & JP 2000 141092A, 23 May 2000). These latter ones have recently provided a better solution from the point of view of increasing the force with variable multiplication ratios upon their dimensioning. An example of a known actuator allows obtaining multiplication ratios that vary from at least two up to a maximum of five times the recirculating screw reaction. It is thereby possible to use screws into a constructive range of standard sizes and loads and parking and operating brakes that are sized even only for 1/5 of the maximum provided force. This type of electro-hydro-mechanical force-intensifying actuator has the further advantage of being of a construction shape that is not unlike the shape of an hydraulic cylinder and it is able to replace this latter one without excessive modifications in the existing machine structures.
  • However, the above-described actuator has two substantial types of problems: first of all, it is equipped with an actuating spring, which does not show a constant reaction pressure, but rather a pressure accumulation and therefore does not perform a constant-force stroke, and after a time tends to lose its own functionalities: moreover, its replacement, in case of need, forces the whole actuator to be disassembled, with obvious problems of times and costs. Secondly, such actuator allows realising multiplication ratios that are not greater than five, which are of a limited application in the field of existing machines.
  • Object of the present invention is solving the above prior-art problems, by providing an hydraulic force-multiplying actuator that is not equipped with a spring but with an air piston, that provides a constant reaction pressure and performs a constant stroke; such arrangement with an adjustable pneumatic piston further allows doing without the oleodynamic unit that was one of the limits of the previous actuator.
  • A further object of the present invention is providing an actuator of the above-mentioned type that allows obtaining multiplication ratios that are up to 25, that are much more suitable for nowadays applications on machines.
  • The above and other objects and advantages of the invention, as will appear from the following description, are obtained by an hydraulic actuator as claimed in Claim 1. Preferred embodiments and non-trivial variations of the present invention are claimed in the dependent Claims.
  • The present invention will be better described by some preferred embodiments thereof, given as a non-limiting example, with reference to the enclosed drawings, in which the single Figure 1 thereof shows a side cross-sectional view of the currently-preferred embodiment of the multiplying actuator of the present invention. As shown in Fig. 1, the hydraulic actuator of the present invention substantially comprises, as its major feature, adjustable pneumatic reaction means 60 that are composed of a compressed-air piston supplied through a duct 52 and that operates on the actuator body in order to exert a constant reaction pressure and to perform a constant-force stroke. Such pneumatic piston 60 replaces the spring that was commonly used in known actuators of this type.
  • The actuator of the invention is further equipped with a shoulder 50 in the working area, such shoulder 50 allowing the operating oil (supplied through the duct 54) to operate in a gradual increase in the working area in order to speed-up and improve the actuator operability.
  • Moreover, the actuator of the invention can be equipped, differently from known actuators, with at least one element 11 that is adapted to prevent the pad of the reaction means 60 from rotating: in practice, such elements 11 are two and are composed of rotation-preventing studs.
  • As shown in detail in Fig. 1, the actuator then comprises, in a known way, normal component parts that are, in detail, the following ones: a pad 1, a stem 2, an head 3, a liner 4, a liner flange 5, a pad support 6, a stem flange 7, a multiplying flange 8, a pneumatic liner 9, a pneumatic head 10, a spindle 12, a spacer 13, an internal spacer 14, a lower spacer 15, a bearing capsule 16, a recirculation screw 18, a screw spacer 19, a padded flange 20, a driven pulley 21, a "n-pur" 22, a "nipsl 310" 23, a 4312 O-ring 24, a "pt1" 25, a "t 20" 26, an "oms - mr" 27, a guiding band 31, an "omk-e" 32, a guiding band 33, an "omk-e" 34, a "pt1" 35, a "pu6" 36, a ring nut 37, a corteco 38, a slanted bearing 39, a scroll 40, a tongue 41, a greaser 42, a slanted bearing 43, a front ring nut 44, a 4762 TCEI - ISO screw 45, pitted bushes 47, screws 48 and a plug 49.
  • The actuator of the invention finds its most efficient application in the field of pressings, and in particular in the field of material forming and cutting, without having to use screws and toggles and allowing to perform both workings in a single operation.

Claims (3)

  1. Hydraulic force-multiplying actuator, comprising a pad (1) and a pad support (6) fixed to a flange (8) and to a spindle (12) of a driven pulley (21), said driven pulley (21) being connected to a recirculating screw (18) acting on a stem (2) comprising a stem flange (7), said stem (2) presenting a shoulder (50) allowing the operating oil supplied through a duct (54) between a piston head (3), connected to an actuator liner (4), and said pad (1), said pad (1) being located within said liner (4) in relative motion thereto, to operate in a gradual increase in the working area, further comprising pneumatic reaction means (60) composed of compressed air supplied through a duct (52) and operating on the actuator body (10) or on a compressed air piston formed by said stem flange (7) in order to exert a reaction pressure.
  2. Actuator according to Claim 1, characterised in that it is further equipped with at least one element (11) adapted to prevent the pad of the reaction means (60) from rotating.
  3. Actuator according to Claim 2, characterised in that said elements (11) are two and are composed of rotation-preventing studs.
EP01124741A 2001-07-05 2001-10-17 Hydraulic force-multiplying actuator Expired - Lifetime EP1273805B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO010648 2001-07-05
IT000648A ITTO20010648A1 (en) 2001-07-05 2001-07-05 FORCE HYDRAULIC MULTIPLIER ACTUATOR.

Publications (3)

Publication Number Publication Date
EP1273805A2 EP1273805A2 (en) 2003-01-08
EP1273805A3 EP1273805A3 (en) 2003-04-09
EP1273805B1 true EP1273805B1 (en) 2004-09-29

Family

ID=11459018

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01124741A Expired - Lifetime EP1273805B1 (en) 2001-07-05 2001-10-17 Hydraulic force-multiplying actuator

Country Status (5)

Country Link
EP (1) EP1273805B1 (en)
AT (1) ATE278111T1 (en)
DE (1) DE60106001T2 (en)
ES (1) ES2228725T3 (en)
IT (1) ITTO20010648A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007116421A1 (en) * 2006-04-12 2007-10-18 O.M.G. S.R.L. Force-multiplying hydraulic actuator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1777270A1 (en) * 1965-05-28 1971-04-08 Frankfurter Maschb Ag Vorm Pok Control of the pressure medium supply to a hydraulic press unit
US4288987A (en) * 1978-11-11 1981-09-15 Eugen Rapp Pneumo-hydraulic booster with rapid-traverse feature
GB2119682B (en) * 1982-04-30 1985-07-10 Cam Gears Ltd Manually controlled power assisted press
DE4236057A1 (en) * 1992-10-26 1994-04-28 Tox Pressotechnik Gmbh Distance sensor for press. converter - has immersion piston, pneumatic controller, working piston displacement detector and electronic controller
JP2000141092A (en) * 1998-11-10 2000-05-23 Enami Seiki:Kk Press machine

Also Published As

Publication number Publication date
EP1273805A3 (en) 2003-04-09
DE60106001D1 (en) 2004-11-04
ATE278111T1 (en) 2004-10-15
ES2228725T3 (en) 2005-04-16
EP1273805A2 (en) 2003-01-08
DE60106001T2 (en) 2005-11-03
ITTO20010648A1 (en) 2001-10-05

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