EP0040976A1 - Drehantriebe - Google Patents

Drehantriebe Download PDF

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Publication number
EP0040976A1
EP0040976A1 EP81302295A EP81302295A EP0040976A1 EP 0040976 A1 EP0040976 A1 EP 0040976A1 EP 81302295 A EP81302295 A EP 81302295A EP 81302295 A EP81302295 A EP 81302295A EP 0040976 A1 EP0040976 A1 EP 0040976A1
Authority
EP
European Patent Office
Prior art keywords
rack
piston
cylinder
pinion
teeth
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Withdrawn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
EP81302295A
Other languages
English (en)
French (fr)
Inventor
Leslie Wilfred Warnett
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.)
Worcester Controls UK Ltd
Original Assignee
Worcester Controls UK Ltd
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 Worcester Controls UK Ltd filed Critical Worcester Controls UK Ltd
Publication of EP0040976A1 publication Critical patent/EP0040976A1/de
Withdrawn legal-status Critical Current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
    • F15B15/02—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
    • F15B15/065—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 rack-and-pinion type

Definitions

  • the invention relates to piston-rack rotary actuators.
  • a disadvantage of a piston-rack rotary actuator which includes a pair of pistons which are displaceable towards and away from one another along a pair of opposed cylinders is that the pistons have a tendency to cock or turn in the cylinders thereby jamming and/or damaging the radial inner surface or surfaces of the cylinders and the seals.
  • a piston rack rotary fluid pressure actuator comprising a housing including a cylinder having a central longitudinal axis; a piston disposed coaxially within said cylinder and arranged for linear movement substantially parallel to said central longitudinal axis of said cylinder under the influence of a difference in fluid pressure created on opposite sides of said piston, said piston including a rack-bearing portion having a toothed rack rigidly connected to said piston; an actuator output shaft rotatably mounted in said housing and disposed transverse to said central longitudinal axis of said cylinder; a pinion rigidly affixed to said actuator output shaft and disposed so that teeth of the pinion engage with teeth of the rack; at least one element having a low coefficient of friction being disposed between and in contact with said rack-bearing portion of said piston and the adjoining portion of the internal surface of said cylinder whereby any forces which tend to displace said rack-bearing portion of said piston toward said adjoining portion of said internal surface of said cylinder are counteracted, character
  • a housing including a cylinder having a central longitudinal axis; two pistons disposed coaxially within said cylinder and arranged for linear movements substantially parallel to said central longitudinal axis of said cylinder either towards or away from one another under the influence of a difference in fluid pressure created on opposite sides of each of said pistons, each said piston including a rack-bearing portion having a toothed rack rigidly connected to said piston; an actuator output shaft rotatably mounted in said housing and disposed transverse to said central longitudinal axis of said cylinder at the mid-length point of said cylinder; a pinion rigidly affixed to said actuator output shaft and disposed between said racks integral with said pistons so that teeth of the pinion engage with teeth of the racks; at least one element having a low coefficient of friction being disposed between and in contact with both said rack-bearing portion of each piston and the respective portion of the internal surface of said cylinder whereby any forces which tend to displace said rack-bearing portion of each of said
  • a housing 10 encloses a cylinder 11 in which two pistons 12 and 13 are disposed coaxially within the cylinder 11 and spring biased by springs 14 and 15 towards the centre of the cylinder 11.
  • Each piston has a toothed rack portion 16 and 17.
  • An output shaft 18 rotatably mounted in the housing 11 has a toothed pinion 19 keyed to the shaft 18 which engages the teeth of both the racks 16 and 17.
  • Low friction bearing material 21 such as DELRIN (Trade Mark) is supported in grooves 20 in outer surfaces of the rack portions 16 and 17.
  • low friction material 22a formed as trapezoids, is supported in grooves 22 in each piston 12 and 13.
  • Spaced annuli 30 and 31 (best seen in Figure 3) keyed to the shaft 18 and having a diameter equal to the pitch circle diameter of the teeth of the pinion 19 are mounted at opposite ends of those teeth.
  • Two flat runways 32 and 33 are fixed to each of the rack bearing portions 16 and 17 to contact the annuli 30 and 31 respectively when the teeth of the pinion 19 and the teeth of the racked portions 16 and 17 are in correct meshing position.
  • pressurised air or liquid is supplied into the cylinder 11 between the pistons 12 and 13 to force the pistons 12 and 13 away from each other and the centre of the cylinder 11 and so rotate the shaft 18.
  • the springs 14 and 15 return the pistons towards their central positions.
  • the annuli 30 and 31 rotate with the shaft 18 to form rolling contacts with the runways 32 and 33. This contact maintains the contacts between the material in the grooves 20 and the walls of the cylinder 11 and at the same time prevents overmeshing of the teeth of the pinion 19 and the teeth of the rack portions 16 and 17, and rotation of the pistons 12 and 13.
  • annuli 30 and 31 and the runways 32 and 33 By forming the annuli 30 and 31 and the runways 32 and 33 of load bearing material such as anodised aluminium, or say, steel where corrosion is not a problem, there is no tendency for such parts to be compressed or deformed by any forces acting transversely to the axis of the cylinder 11. Further, by arranging for the contact between the annuli 30 and 31 and the runways 32 and 33 to be a rolling contact any tendency for the annuli to stick or slide is overcome.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Transmission Devices (AREA)
EP81302295A 1980-05-27 1981-05-22 Drehantriebe Withdrawn EP0040976A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8017273 1980-05-27
GB8017273A GB2077355A (en) 1980-05-27 1980-05-27 Rotary actuators

Publications (1)

Publication Number Publication Date
EP0040976A1 true EP0040976A1 (de) 1981-12-02

Family

ID=10513654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81302295A Withdrawn EP0040976A1 (de) 1980-05-27 1981-05-22 Drehantriebe

Country Status (6)

Country Link
EP (1) EP0040976A1 (de)
JP (1) JPS57103915A (de)
AU (1) AU7091581A (de)
ES (1) ES8301525A1 (de)
GB (1) GB2077355A (de)
ZA (1) ZA813367B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0092987A1 (de) * 1982-04-24 1983-11-02 Joaquin Triado-Isern Druckmittelbetätigter Drehantrieb
EP0099546A1 (de) * 1982-07-21 1984-02-01 AVA Steuerungstechnik GmbH Drehantrieb
WO1984003129A1 (en) * 1983-02-11 1984-08-16 Wm Regler Ab A fluid pressure actuator having position setting means
GB2318616A (en) * 1996-10-14 1998-04-29 Smc Corp Rotary actuator
DE102018218311B3 (de) * 2018-10-26 2020-04-16 Festo Se & Co. Kg Fluidbetätigter Drehantrieb und damit ausgestattete Drehantriebsanordnung

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT8223222V0 (it) * 1982-10-18 1982-10-18 Giovanni Trevisan Dispositivo di guida per pistoni di azionatori fluidodinamici, particolarmente del tipo rotante a due pistoni coassiali, muniti di cremagliere.
DE3310856C1 (de) * 1983-03-25 1984-07-19 Norbro Antriebstechnik GmbH, 4050 Mönchengladbach Drehbetätigungsvorrichtung
CH661331A5 (de) * 1983-08-25 1987-07-15 Fischer Ag Georg Ventileinrichtung mit einer fernsteuerbaren betaetigungseinrichtung.
US4884495A (en) * 1988-06-20 1989-12-05 El-O-Matic-Usa, Inc. Fluid motor actuator with compression spring fail-safe mechanism

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2647385A1 (de) * 1975-10-21 1977-05-05 Griesel Bv Druckmittelbetaetigte drehantriebs- oder stellvorrichtung
US4167897A (en) * 1975-06-19 1979-09-18 Bunyard Alan D Rotary actuators

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2844127A (en) * 1955-03-03 1958-07-22 Steiner Carl Fluid pressure torque converter
US3246581A (en) * 1963-10-23 1966-04-19 Flo Tork Inc Air actuator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4167897A (en) * 1975-06-19 1979-09-18 Bunyard Alan D Rotary actuators
DE2647385A1 (de) * 1975-10-21 1977-05-05 Griesel Bv Druckmittelbetaetigte drehantriebs- oder stellvorrichtung

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0092987A1 (de) * 1982-04-24 1983-11-02 Joaquin Triado-Isern Druckmittelbetätigter Drehantrieb
EP0099546A1 (de) * 1982-07-21 1984-02-01 AVA Steuerungstechnik GmbH Drehantrieb
WO1984003129A1 (en) * 1983-02-11 1984-08-16 Wm Regler Ab A fluid pressure actuator having position setting means
GB2318616A (en) * 1996-10-14 1998-04-29 Smc Corp Rotary actuator
GB2318616B (en) * 1996-10-14 1999-10-06 Smc Corp Rotary actuator
US6170797B1 (en) 1996-10-14 2001-01-09 Smc Corporation Rotary actuator
DE102018218311B3 (de) * 2018-10-26 2020-04-16 Festo Se & Co. Kg Fluidbetätigter Drehantrieb und damit ausgestattete Drehantriebsanordnung

Also Published As

Publication number Publication date
ES502492A0 (es) 1982-12-01
GB2077355A (en) 1981-12-16
JPS57103915A (en) 1982-06-28
AU7091581A (en) 1981-12-03
ZA813367B (en) 1982-07-28
ES8301525A1 (es) 1982-12-01

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR IT LU NL SE

17P Request for examination filed

Effective date: 19811028

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19831010

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WARNETT, LESLIE WILFRED