EP0578995B1 - Pneumatic rotary actuator with increased starting torque - Google Patents
Pneumatic rotary actuator with increased starting torque Download PDFInfo
- Publication number
- EP0578995B1 EP0578995B1 EP93109868A EP93109868A EP0578995B1 EP 0578995 B1 EP0578995 B1 EP 0578995B1 EP 93109868 A EP93109868 A EP 93109868A EP 93109868 A EP93109868 A EP 93109868A EP 0578995 B1 EP0578995 B1 EP 0578995B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- main
- chamber
- additional
- actuator
- 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
Links
- 238000013016 damping Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 7
- 238000005192 partition Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 3
- 238000013022 venting Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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
- F15B15/068—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
Definitions
- the present invention relates to a pneumatic rotary actuator of the type comprising a hollow cylindrical body defining an elongated chamber inside which a double-acting piston member reciprocates; the piston member has a threaded central hole which engages with a thread shaft rotatably supported and axially protruding from one end of the actuator. Fluid under pressure alternately acts first on the sides of the piston member to cause a reciprocating movement and the consequent rotation of the thread shaft of the rotary actuator (see for example DE-A-29 19 435).
- Pneumatic actuators with a rotating shaft are widely known and used on account of their operating features and their ability to provide high torques over the entire travel of the piston, with the possibility of stopping the latter at any desired point of the rotational arc of the output shaft which may reach and even exceed 360°.
- Pneumatic rotary actuators are generally preferred to other types of actuators, for example to actuators of electrical type, whenever, for safety purposes or other reasons, operation under safety conditions is required.
- the pneumatic rotary actuators currently known unlike electric actuators, provide a torque of constant value over the entire working travel, without the possibility of varying or increasing the said torque in a controlled manner.
- the main scope of the present invention is to provide a pneumatic rotary actuator of the kind mentioned above, by means of which it is possible to obtain varying torque values, in particular a greater starting torque value in one or both the rotational directions of the actuator shaft or over a desired portion of the piston travel.
- a further scope of the present invention is to provide a pneumatic rotary actuator of the abovementioned kind which has extremely small dimensions, for a same working travel and maximun torque value, and by means of which the reactive twisting moment which normally acts on the operating piston of the actuator can also be distributed over a large area; in this way it is possible to achieve smooth sliding of the piston, substantially without any reaction problems.
- the actuator 10 comprises a hollow cylindrical body 11 consisting for example of a barrel axially extending and having a polygonal cross-section, and of two closing end-pieces 12 and 13.
- the cylindrical body 11 is divided up into a main chamber 14 extending in the axial direction of the actuator, and into two lateral chambers 15, 16 of smaller length than the main chamber 14, which are separated from the main chamber 14 for example by internal partitions 17, 18 provided by the bottom wall of a corresponding cup-shaped elements defining the lateral chambers 15, 16; each cup-shaped member is sealingly inserted in the body 11 against suitable stop means provided by an annular shoulder inside the barrel and retained by the end-piece 12 and 13; tie-rods, not shown, pass through suitable holes in the end-pieces 12, 13 and are screwed into corresponding holes in the barrel 11 of the actuator, as for example indicated by 19 in Figure 3.
- a main double-acting piston 20 having a polygonal cross-section corresponding to that of the body 11, the internal surfaces of which therefore define guide means preventing rotation of the piston 20.
- the piston 20 is made from a material having a low friction and has an axial hole 20A which is internally provided with a threaded portion so as to engage with a thread shaft 21 of the actuator which is supported so as to rotate coaxially and emerging from one end of the body 10 of the actuator, passing through central openings 22 (only one is shown in Figure 1) in the partitions 17, 18 which separate the main chamber 14 from the lateral chambers 15 and 16; ports 23, 24 are provided in the end pieces 12 and 13 for sequentially supplying and discharging compressed air in the chambers of the actuator.
- each lateral chamber 15, 16 there is provided a respective secondary single-acting piston 25, 26 having a tubular shaft extension 27, 28 sliding in a sealed manner through the central hole 22 of the partitions 17, 18 so as to extend through the same, towards and against the main piston 20 in such a way as to provide an additional thrusting action for an initial portion of the travel of the piston 20 at each end of chamber 14, in the manner described further below.
- Rotating seals 35 are provided at both ends of the main piston 20 in such a way as to be adapted to the threading of the shaft 21 so that an adequate sealing action is provided between the two sides of the main chamber 14.
- the pneumatic rotary actuator according to the invention is provided moreover with pneumatic damping means which act to brake the sliding movement of the piston 20 and hence rotation of the shaft 21 when piston 20 approaching the two ends of the travel of the piston itself.
- the pneumatic damping means comprises substantially an adjustable needle valve 29 in each end-piece 12, 13 to connect chamber 14 to the exterior through a corresponding annular passage 23A, 24A supplying compressed air into the aforementioned chambers 14, 15 and 16.
- the damping means on each side of the main piston 20, comprise a tubular element 30 axially extending around and spaced apart from the threaded shaft 21 and tubular shaft 27; the tubular element 30 protrudes from a plate 31 which is fixed, for example screwed to a corresponding end face of the piston 20.
- the tubular element 30 has an internal diameter slightly greater than the maximum diameter of the shaft 21, and an external diameter slightly smaller than the internal diameter of the tubular extension 27, 28, respectively, of the two secondary pistons 25, 26 so as to provide the necessary passages for the fluid under pressure.
- the tubular element 30 cooperates moreover with a lip seal 32 for the required sealing action with respect to the needle valve 29, necessary for obtaining the desired pneumatic damping effect.
- FIG. 2 denotes venting holes for the chambers 15 and 16 on the side of the secondary piston which is opposite to the supplying side for the fluid under pressure, while 34 denotes radial holes in the tubular extensions 27 and 28 of the two lateral pistons, for allowing the passage of the fluid under pressure from the respective supply port 29, via the lip seal 32, to the fluid supply side of each lateral chamber 15, 16, along the annular duct formed between each tubular extension 27, 28 and the respective tubular element 30 of the pneumatic damping system, towards the corresponding side of the main chamber 14, through radial holes 34.
- the thrusting action of the secondary piston 25 combined with that of the piston 20 will be exerted for a short portion of the travel of the piston 25, due to short length of chambers 14 and 15 i.e. for a length in any case sufficient to overcome the starting friction and provide a speed sufficient to start the movement of the load connected to the shaft 21.
- the secondary piston 25 or the secondary piston 26, respectively have completed their forward travel, the movement of the central piston 20 is made to continue by the action alone of the air inside a respective side of the chamber 14; this thrust which is equal to half or in any case is less than the initial thrust is now more than sufficient to continue the sliding of piston 20 and the rotational movement of the shaft 21; in this way a considerably smaller amount of compressed air is requested.
Description
- The present invention relates to a pneumatic rotary actuator of the type comprising a hollow cylindrical body defining an elongated chamber inside which a double-acting piston member reciprocates; the piston member has a threaded central hole which engages with a thread shaft rotatably supported and axially protruding from one end of the actuator. Fluid under pressure alternately acts first on the sides of the piston member to cause a reciprocating movement and the consequent rotation of the thread shaft of the rotary actuator (see for example DE-A-29 19 435).
- Pneumatic actuators with a rotating shaft, of the type mentioned above, are widely known and used on account of their operating features and their ability to provide high torques over the entire travel of the piston, with the possibility of stopping the latter at any desired point of the rotational arc of the output shaft which may reach and even exceed 360°.
- Pneumatic rotary actuators are generally preferred to other types of actuators, for example to actuators of electrical type, whenever, for safety purposes or other reasons, operation under safety conditions is required. However, the pneumatic rotary actuators currently known, unlike electric actuators, provide a torque of constant value over the entire working travel, without the possibility of varying or increasing the said torque in a controlled manner.
- Apart from using pneumatic rotary actuators dimensioned to provide only the maximum torque required, no pneumatic rotary actuators able to provide varying torque values are presently known.
- In many applications for which the use of pneumatic actuators is particularly recommended, for example for the opening and closing of access doors in rolling stock, or for other special applications, the use of conventional rotary actuators has proved to be unsuitable both on account of the greater overall dimensions which these actuators must necessarily have in order to provide the maximum torques required, and on account of the consequent greater quantity of pressurised air which is used.
- Therefore, the main scope of the present invention is to provide a pneumatic rotary actuator of the kind mentioned above, by means of which it is possible to obtain varying torque values, in particular a greater starting torque value in one or both the rotational directions of the actuator shaft or over a desired portion of the piston travel.
- A further scope of the present invention is to provide a pneumatic rotary actuator of the abovementioned kind which has extremely small dimensions, for a same working travel and maximun torque value, and by means of which the reactive twisting moment which normally acts on the operating piston of the actuator can also be distributed over a large area; in this way it is possible to achieve smooth sliding of the piston, substantially without any reaction problems.
- These and other scopes may be achieved by means of a pneumatic rotary actuator, according to the invention, as defined in claim 1.
- A preferred embodiment of a pneumatic rotary actuator according to the invention will be described hereinbelow, with reference to the figures of the accompanying drawings, in which:
- Fig. 1 is a longitudinal sectional view of the actuator;
- Fig. 2 is an enlarged sectional view of the left-side end of the actuator shown in Fig. 1, in a different operating condition;
- Fig. 3 is a cross-sectional view along the line 3-3 of Figure 2.
- As shown in the various figures, the
actuator 10 comprises a hollowcylindrical body 11 consisting for example of a barrel axially extending and having a polygonal cross-section, and of two closing end-pieces - The
cylindrical body 11 is divided up into amain chamber 14 extending in the axial direction of the actuator, and into twolateral chambers main chamber 14, which are separated from themain chamber 14 for example byinternal partitions lateral chambers body 11 against suitable stop means provided by an annular shoulder inside the barrel and retained by the end-piece pieces barrel 11 of the actuator, as for example indicated by 19 in Figure 3. - Inside the
main chamber 14 reciprocates a main double-actingpiston 20 having a polygonal cross-section corresponding to that of thebody 11, the internal surfaces of which therefore define guide means preventing rotation of thepiston 20. - The
piston 20 is made from a material having a low friction and has anaxial hole 20A which is internally provided with a threaded portion so as to engage with athread shaft 21 of the actuator which is supported so as to rotate coaxially and emerging from one end of thebody 10 of the actuator, passing through central openings 22 (only one is shown in Figure 1) in thepartitions main chamber 14 from thelateral chambers ports end pieces - Inside each
lateral chamber piston tubular shaft extension central hole 22 of thepartitions main piston 20 in such a way as to provide an additional thrusting action for an initial portion of the travel of thepiston 20 at each end ofchamber 14, in the manner described further below. - Rotating
seals 35 are provided at both ends of themain piston 20 in such a way as to be adapted to the threading of theshaft 21 so that an adequate sealing action is provided between the two sides of themain chamber 14. - The pneumatic rotary actuator according to the invention is provided moreover with pneumatic damping means which act to brake the sliding movement of the
piston 20 and hence rotation of theshaft 21 whenpiston 20 approaching the two ends of the travel of the piston itself. - The pneumatic damping means comprises substantially an
adjustable needle valve 29 in each end-piece chamber 14 to the exterior through a correspondingannular passage aforementioned chambers main piston 20, comprise atubular element 30 axially extending around and spaced apart from the threadedshaft 21 andtubular shaft 27; thetubular element 30 protrudes from aplate 31 which is fixed, for example screwed to a corresponding end face of thepiston 20. Thetubular element 30 has an internal diameter slightly greater than the maximum diameter of theshaft 21, and an external diameter slightly smaller than the internal diameter of thetubular extension secondary pistons - The
tubular element 30 cooperates moreover with alip seal 32 for the required sealing action with respect to theneedle valve 29, necessary for obtaining the desired pneumatic damping effect. - Finally 33 in Figure 2 denotes venting holes for the
chambers tubular extensions respective supply port 29, via thelip seal 32, to the fluid supply side of eachlateral chamber tubular extension tubular element 30 of the pneumatic damping system, towards the corresponding side of themain chamber 14, throughradial holes 34. - The operation of the pneumatic rotary actuator according to the invention is briefly as follows: let us assume that the actuator is in the condition shown in Figure 1 and that the air under pressure is supplied via the
port 23. Under these conditions, the compressed air flowing along the path described above reaches simultaneously themain chamber 14 and thelateral chamber 15 on the corresponding sides of the twopistons piston 20 will be subject to a thrust force which is twice or greater than that exerted by the compressed air inside thechamber 14 only of the piston, since will be added the thrust exerted by thepiston 25 via itstubular extension 27 which protrudes through thecentral hole 22 in thepartition 17 and acts against theplate 31, pushing thepiston 20. The thrusting action of thesecondary piston 25 combined with that of thepiston 20 will be exerted for a short portion of the travel of thepiston 25, due to short length ofchambers shaft 21. When thesecondary piston 25 or thesecondary piston 26, respectively, have completed their forward travel, the movement of thecentral piston 20 is made to continue by the action alone of the air inside a respective side of thechamber 14; this thrust which is equal to half or in any case is less than the initial thrust is now more than sufficient to continue the sliding ofpiston 20 and the rotational movement of theshaft 21; in this way a considerably smaller amount of compressed air is requested. - When the
piston 20 approaches the end of its forward travel, thetubular element 30 penetrates into thetubular extension 28 of the correspondingsecondary piston 26, coming into contact with thelip seal 32 which prevents the passage of air to thecorresponding venting valve 29; in this way there is compression of the air remaining inside thechamber 14 and a consequent dampening action of thepiston 20 and load movement. After movement of thepiston 20 and of the load connected thereto has been completed in one direction, operation of theactuator 10 may be reversed, by supplying the fluid under pressure by theother port 24. - It will therefore be understand from what has been said and illustrated, that it has been possible to provide a pneumatic rotary actuator of the type having a rotating shaft, provided with a starting torque greater than that normally supplied during the normal travel of the actuator, on account of the original combination of a main piston and at least one secondary piston which act, at the start of each working stroke, to provide an additional thrust along an initial portion of the travel corresponding to the travel of the secondary piston itself. As a result of the coaxial arrangement of the assembly and the use of suitable internal guiding surfaces for the main piston, it is also possible to obtain a rotary actuator of very small dimension, which is safe to use and extremely reliable. Finally an extremely advantageous design ensuring suitable operation of the actuator is achieved as a result of the use of suitable anti-frictional material for the piston and rotating seals which are adapted to the geometry of the threading of the
shaft 21.
Claims (5)
- Pneumatic rotary actuator of the type comprising a hollow body (11) defining an axially extending main chamber (14) a main double-acting piston (20) reciprocable in said main chamber (14), said main piston ( 20) having an internally threaded axial hole (20A) for coupling with a thread shaft (21) rotatably supported and coaxially extending from one end of said body (11), characterized in that, at least one end of said actuator comprises additional pneumatically actuated piston means (25, 26), each additional piston means (25, 26) acting to forwardly thrust the main piston (20) for a short initial portion of the working stroke, and in that antirotational guide means are provided on facing surfaces of the hollow body (11) and said main piston (20) of the actuator.
- Pneumatic rotary actuator according to Claim 1, characterized in that each side of the main chamber (14) and a corresponding side of a piston chamber (15, 16) for said additional piston means (25, 26) are connected to a same inlet port for fluid under pressure through an annular passage axially extending around the threaded shaft (21).
- Pneumatic rotary actuator according to Claim 1, characterized in that each additional piston means comprises an additional piston chamber (15, 16) axially aligned with and having a length smaller than that of said main chamber (14), and in that a secondary single-acting piston (25, 26) is axially movable inside said additional chamber (15, 16), said secondary piston (25, 26) having a tubular extension (27, 28) coaxially arranged with respect to the threaded shaft (21), said tubular extension (27, 28) protruding towards said main piston (20) through a central hole in a partitions (17, 18) separating the main chamber (14) from said additional chamber (15, 16) of the actuator.
- Pneumatic rotary actuator according to Claim 1, characterized in that pneumatic damping means (29, 30) are provided at each end of the main piston (20) and main chamber (14) of the actuator.
- Pneumatic rotary actuator according to Claim 4, characterized in that said pneumatic damping means comprise a tubular element (30) extending from each end of the main piston (20), said tubular element (30) being axially arranged and radially spaced apart from the tubular extension (27, 28) of the additional piston means, and sealing means at one end of the hollow body, respectively encircling said tubular member (30) of the main piston (20), to provide a seal between each additional chamber (15, 16) and a venting valve (29) connected to a air feeding passage for feeding pressurised air to piston chambers (14, 15, 16) of the actuator.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI921576A IT1255184B (en) | 1992-06-26 | 1992-06-26 | PNEUMATIC ROTARY ACTUATOR WITH INCREASED TORQUE TORQUE |
ITMI921576 | 1992-06-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0578995A1 EP0578995A1 (en) | 1994-01-19 |
EP0578995B1 true EP0578995B1 (en) | 1995-12-13 |
Family
ID=11363586
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93109868A Expired - Lifetime EP0578995B1 (en) | 1992-06-26 | 1993-06-21 | Pneumatic rotary actuator with increased starting torque |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0578995B1 (en) |
DE (1) | DE69301012T2 (en) |
ES (1) | ES2081164T3 (en) |
IT (1) | IT1255184B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105179364A (en) * | 2015-09-21 | 2015-12-23 | 济南大学 | Combined connection device for preventing piston from rotating in radial direction and moving in axial direction |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2543807B2 (en) * | 2011-07-06 | 2020-03-18 | Isaf Bus Components S.r.l. | Rotary actuator for moving a swivel swing door, particularly in vehicles |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2970574A (en) * | 1959-04-14 | 1961-02-07 | Gen Motors Corp | Dual piston hydraulic centering actuator |
US2932206A (en) * | 1959-05-14 | 1960-04-12 | Gen Motors Corp | Twin rotary actuator |
DE2748955C2 (en) * | 1977-11-02 | 1986-12-04 | Walter Dipl.-Ing. 7758 Meersburg Holzer | Pneumatic or hydraulic rotary drive, especially for swing doors |
ATA387978A (en) * | 1978-05-29 | 1982-08-15 | Ife Gmbh | ROTARY DRIVE FOR DOORS OR THE LIKE. |
-
1992
- 1992-06-26 IT ITMI921576A patent/IT1255184B/en active IP Right Grant
-
1993
- 1993-06-21 EP EP93109868A patent/EP0578995B1/en not_active Expired - Lifetime
- 1993-06-21 DE DE69301012T patent/DE69301012T2/en not_active Expired - Fee Related
- 1993-06-21 ES ES93109868T patent/ES2081164T3/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105179364A (en) * | 2015-09-21 | 2015-12-23 | 济南大学 | Combined connection device for preventing piston from rotating in radial direction and moving in axial direction |
Also Published As
Publication number | Publication date |
---|---|
ITMI921576A1 (en) | 1993-12-26 |
DE69301012T2 (en) | 1996-05-09 |
EP0578995A1 (en) | 1994-01-19 |
ES2081164T3 (en) | 1996-02-16 |
DE69301012D1 (en) | 1996-01-25 |
ITMI921576A0 (en) | 1992-06-26 |
IT1255184B (en) | 1995-10-20 |
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