EP0040976A1 - Vérin rotatif - Google Patents
Vérin rotatif Download PDFInfo
- 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- Withdrawn
Links
Images
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)
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 (fr) | 1981-12-02 |
Family
ID=10513654
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81302295A Withdrawn EP0040976A1 (fr) | 1980-05-27 | 1981-05-22 | Vérin rotatif |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0040976A1 (fr) |
JP (1) | JPS57103915A (fr) |
AU (1) | AU7091581A (fr) |
ES (1) | ES502492A0 (fr) |
GB (1) | GB2077355A (fr) |
ZA (1) | ZA813367B (fr) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0092987A1 (fr) * | 1982-04-24 | 1983-11-02 | Joaquin Triado-Isern | Dispositif rotatif à pression de fluide |
EP0099546A1 (fr) * | 1982-07-21 | 1984-02-01 | AVA Steuerungstechnik GmbH | Entraînement rotatif |
WO1984003129A1 (fr) * | 1983-02-11 | 1984-08-16 | Wm Regler Ab | Verin de pression hydraulique dote d'un mecanisme de reglage de la position |
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)
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)
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)
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 |
-
1980
- 1980-05-27 GB GB8017273A patent/GB2077355A/en not_active Withdrawn
-
1981
- 1981-05-20 ZA ZA00813367A patent/ZA813367B/xx unknown
- 1981-05-21 AU AU70915/81A patent/AU7091581A/en not_active Abandoned
- 1981-05-22 EP EP81302295A patent/EP0040976A1/fr not_active Withdrawn
- 1981-05-26 ES ES502492A patent/ES502492A0/es active Granted
- 1981-05-27 JP JP56079441A patent/JPS57103915A/ja active Pending
Patent Citations (2)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0092987A1 (fr) * | 1982-04-24 | 1983-11-02 | Joaquin Triado-Isern | Dispositif rotatif à pression de fluide |
EP0099546A1 (fr) * | 1982-07-21 | 1984-02-01 | AVA Steuerungstechnik GmbH | Entraînement rotatif |
WO1984003129A1 (fr) * | 1983-02-11 | 1984-08-16 | Wm Regler Ab | Verin de pression hydraulique dote d'un mecanisme de reglage de la position |
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 |
---|---|
ES8301525A1 (es) | 1982-12-01 |
GB2077355A (en) | 1981-12-16 |
AU7091581A (en) | 1981-12-03 |
ES502492A0 (es) | 1982-12-01 |
JPS57103915A (en) | 1982-06-28 |
ZA813367B (en) | 1982-07-28 |
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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 |