EP0663261B1 - Entraînement pour actionner un arbre de pignon - Google Patents

Entraînement pour actionner un arbre de pignon Download PDF

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Publication number
EP0663261B1
EP0663261B1 EP94119010A EP94119010A EP0663261B1 EP 0663261 B1 EP0663261 B1 EP 0663261B1 EP 94119010 A EP94119010 A EP 94119010A EP 94119010 A EP94119010 A EP 94119010A EP 0663261 B1 EP0663261 B1 EP 0663261B1
Authority
EP
European Patent Office
Prior art keywords
piston
drive according
stop
rack
toothed
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
EP94119010A
Other languages
German (de)
English (en)
Other versions
EP0663261A1 (fr
Inventor
Christian Wullschleger
Albrecht Trenner
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.)
Montech AG
Original Assignee
Montech AG
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 Montech AG filed Critical Montech AG
Publication of EP0663261A1 publication Critical patent/EP0663261A1/fr
Application granted granted Critical
Publication of EP0663261B1 publication Critical patent/EP0663261B1/fr
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
    • F15B15/02—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18888—Reciprocating to or from oscillating
    • Y10T74/18976—Rack and pinion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19623—Backlash take-up
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19642—Directly cooperating gears
    • Y10T74/1967—Rack and pinion

Definitions

  • the invention relates to a drive for rotating a pinion shaft provided with toothed racks by means of a toothed rack which is connected on both sides to pistons which are accommodated in a respective cylinder to form a working space which can be acted upon by a pressure medium and can be closed by a cover or piston, the toothed rack is arranged to be displaceable relative to a toothed piston and both the toothed rack and the toothed piston engage with their teeth in the toothed strips of the pinion shaft.
  • EP-A 0 476 280 discloses a device for rotating workpieces to be machined on a carrier, for example, which can be set in rotation by a pinion shaft with toothed racks via a rack.
  • the rack should be slidably arranged in a cylinder bore of a housing. It is essential that the distance between the toothing and the pinion shaft or toothed rack should be changeable, which is done by adjusting an edge-side play of a pin on the rack on which a grub screw strikes. To adjust the rotary drive must be stopped, then manual adjustment using a screwdriver or the like takes place. instead of.
  • a pressure chamber is formed on both sides of the toothed piston in the rack, which is connected via corresponding connecting lines to work spaces in which the pistons are displaceably mounted for the rack. If these working spaces are put under pressure, then the corresponding pressure space for the Toothed piston is pressurized and the toothed strips of the pinion source are clamped.
  • the object of the present invention is a drive of the above. To develop a way in which there is an automatic cancellation of the play between the toothing of the rack and the toothed strips of the pinion shaft in the end positions.
  • the rack is assigned a stop for its relative displacement relative to the toothed piston in its end positions.
  • the toothed rack and the toothed piston can be arranged around the pinion shaft in any way, but the synchronization of the common movement is made more difficult in the event of a separation.
  • the toothed rack is received in an elongated hole in the toothed piston, in particular in the median strip, and is guided on both sides via corresponding guide pins in corresponding bores in the toothed piston or the piston.
  • the guide bolts protrude a certain amount from the end faces.
  • a stop for example a cover closing the cylinder
  • the guide pin is pressed into the bore of the toothed piston or the piston, so that toothing of the toothed rack for toothing of the toothed piston is offset. This is already a possible play to the toothed racks of the pinion shaft is only canceled in the end positions.
  • end faces of the toothed rack are arranged within the elongated hole at a variable distance from an inner wall of the elongated hole.
  • the toothed rack can be moved relative to the toothed piston, whereby the shifting takes place automatically when the unit consisting of toothed rack and toothed piston moves, without requiring a particular synchronization of both movements.
  • the rack is floating in the toothed piston. The toothing of the toothed rack presses the toothing of the toothed piston against one wall of a toothed rack against the opposite wall of the following toothed rack so that both toothings are in contact with the toothed bars and play is eliminated.
  • Another possibility of automatically displacing the toothed rack with respect to the toothed piston is to form a stop strip on the toothed rack or on a rod part of this toothed rack.
  • a shock absorber is selected as the stop, the stop strip striking a tappet of the shock absorber during its movement.
  • the shock absorber itself forms a stop surface for the stop strip with its end face from which the tappet protrudes. In order to be able to change an end position in this case, only the distance between the stop and the stop strip needs to be changed, which is done by moving or rotating the shock absorber. However, other possibilities are also conceivable for this and should be encompassed by the invention.
  • At least one proximity switch should preferably be assigned to the stop and / or the stop strip, which is also designed to be adjustable when the stop is adjusted.
  • this intermediate stop has a tube which, for simplicity, is placed on the cylinder, in particular screwed on.
  • an additional piston slides into the cylinder, which in turn is connected to a piston rod in the intermediate stop.
  • This piston rod passes through an intermediate cover, which forms a pressure chamber with the piston just mentioned. If a pressure medium is entered into this pressure chamber, the piston is also extended in the direction of the toothed piston, so that the movement of the toothed piston is limited.
  • a threaded section is provided on the piston rod, on which an adjustable stop nut is placed. This stop nut interacts with a corresponding shoulder in the intermediate stop.
  • an additional drive piston should be placed on the piston rod after the intermediate cover, which forms a further pressure chamber with a cylinder head.
  • a pinion shaft 2 with toothed racks is rotatably mounted in a housing 1.
  • a rotation of the pinion shaft 2 in the direction of the double arrow z is effected by a toothed piston 3 in cooperation with a rack 4.
  • Toothed piston 3 and rack 4 are arranged perpendicular to an axis of rotation 5 of the pinion shaft 2.
  • the rack 4 is seated in an elongated hole 6 of a central part 3a of the toothed piston 3, the elongated hole 6 being shown in more detail in FIG.
  • the toothed rack 4 and toothed piston 3 are mounted so as to be displaceable in the direction of the double arrow x, with the toothed piston 3 and toothed rack 4 also being able to be moved relative to one another to each other is possible. For this reason, end faces 7 and 8 of the toothed rack 4 maintain a distance a from each of the respective inner walls 9 and 10 of the elongated hole 6 on both sides. This distance a can be changed during operation of the combination rack and toothed piston. If the distance a is the same on both sides, a toothing of the toothed piston 3 (not shown in more detail) is aligned with a toothing 11 of the toothed rack 4.
  • the rack 4 is otherwise T-shaped, with a rod part 12, which has the above-mentioned teeth, an approximately vertically projecting stop strip 13 is formed approximately in the middle. In the position of use, this stop strip 13 engages between two plungers 14a and 14b of shock absorbers 15, both shock absorbers 15 being configured identically, which is why only one is described below.
  • the shock absorber 15 has an external thread 16, via which it is screwed into a stop bush 17. To lock it, a lock nut 18 is screwed onto the shock absorber 15.
  • the stop bushing 17 also has an external thread with which it is screwed into a part of the housing 1 and is secured against rotation by a threaded pin 46. By turning the stop bush 17, its stop surface 19 is changed in relation to the stop strip 13 (distance b). This process corresponds to a stroke adjustment of the rack 4 and thus a change in the angle of rotation of the pinion shaft 2.
  • a receptacle 20 for a proximity switch in the housing 1 In addition to the shock absorber 15, there is a receptacle 20 for a proximity switch in the housing 1.
  • the proximity switch in the receptacle is axially adjustable. This is done by loosening or tightening a grub screw 42. Since the stop strip 13, which interacts with the plungers 14a and 14b, moves outside the detection range of the proximity switch, a stop 43 is also assigned to the stop strip 13.
  • the area between the two shock absorbers 15 is covered by a cover 21.
  • the two opposite tabs 44 and the screws 45 are used to fix them.
  • a cylinder 22 for receiving a piston 23 of the toothed piston 3 is inserted into the housing 1 from both sides.
  • the piston 23 forms with a cover 24 a working space 25, the volume of which can be changed.
  • the cover 24 has an axial bore 26 for admitting a pressure medium into the working space 25.
  • the cover 24 also has an annular flange 27 with which it rests on an annular edge 28 of the cylinder 22 and is held there by means of a union nut 29.
  • a piston cover 30 is placed on the front of each piston 23 and held there by a screw 31.
  • a sealing ring 33 is held between piston cover 30 and piston 23 in a formed annular groove 32.
  • This sealing ring 33 takes over a seal against the Working space 25, while the sealing ring 33 is followed by a guide ring 34 which serves to guide the piston 23 within the cylinder 22.
  • An axially parallel bore 35 is formed in each piston 23, with which a corresponding bore 36 in the piston cover 30 is aligned.
  • a guide pin 37 is slidably mounted in the bores 35 and 36, the guide pin 37 being supported against the bore 35 via guide rings 38 and 39 with the interposition of a sealing ring 40.
  • Each guide pin 37 is inserted into a stepped bore 41 in the rod part 12 of the rack 4, with corresponding threads interacting.
  • the housing 1 has two dovetails 47a and 47b for fixing the rotary drive.
  • a cover 48 is inserted into the dovetail 47b, which covers a bearing 49 for the pinion shaft 2.
  • this is accommodated in a further layer 50.
  • the toothed rack 4 and toothed piston 3 must move to the left in FIG. 1. That is, the right-hand working space 25 is pressurized so that the unit comprising the toothed piston 3 and the rack 4 moves to the left.
  • the proximity switches mentioned above give the electronic control a signal as soon as one of the two stop surfaces 19 is reached by the stop strip 13.
  • an intermediate stop 52 according to the invention is shown, with which, when an intermediate stop 52 is inserted into a respective cylinder 22, along with the two end positions of the pinion shaft 2, which result from the stop strip 13 moving onto the stop surfaces 19 an intermediate layer can be approached, which results from the impact of the guide pin 37 on the buffer 64 when the piston 55 protrudes into the cylinder 22 by an adjustable amount.
  • this piston 55 On the circumference, this piston 55 has a corresponding piston seal 56, which seals against the inner wall of the cylinder.
  • the space of the cover 24 is now taken over by an intermediate cover 57 inserted into the tube 53. This carries an appropriate ring seal 59 for the cylinder 22 in an annular groove 58.
  • the intermediate cover 57 is penetrated by a piston rod 60, which is step-shaped.
  • the piston 55 is supported against a stop shoulder 61 and is fixed by a locking ring 62.
  • a buffer 64 is also inserted into a recess 63 in the front of this piston 55.
  • the piston rod 60 forms a further shoulder 65, to which a drive piston 66 connects.
  • This drive piston 66 slides in a working space 67 within the tube 53 and has a corresponding piston seal 68.
  • the drive piston 66 forms, together with a cylinder head 69, a pressure chamber 70, which can be fed with a pressure medium from a feed line 71 through the cylinder head 69. Furthermore, the pressure chamber 70 is connected via an axial bore 72 within the piston rod 60 to a front pressure chamber 73 between the intermediate cover 57 and the piston 55.
  • the piston 55 When pressure medium is supplied through the feed line 71, the piston 55 is extended to an end position in order to determine a further end stop for the toothed piston 3, the force on the piston 55 being approximately twice as high due to the simultaneous pressure build-up in the pressure spaces 70 and 73 , which can be generated by the piston 23.
  • the immersion depth of the piston 55 in the cylinder 22 is limited by a stop nut 74, which is beyond the Piston 55 is screwed onto a threaded section 75 of the piston rod 60.
  • a clamping screw 76 is used to clamp the stop nut 74 in a desired position on the threaded section 75.
  • the stop nut 74 cooperates with a stop shoulder 77 in the cylinder head 69, the stop nut 74 also being formed onto a sleeve apron 78 which can engage in a blind hole recess 79 in the cylinder head 69. In doing so, it activates an inductive proximity switch (not shown), the axis of which has the same position as the compressed air feed 80, but is arranged at 90 ° to it.
  • the proximity switch gives the electronic control a signal when the piston 55 has reached its end position protruding into the cylinder 22.
  • a further union nut 82 is used to hold the cylinder head 69 on the tube 53. This arrangement allows the two threaded bores to be rotated into any position for feeding the compressed air into the cylinder head 69. Furthermore, a cap 83 is placed on the end of the cylinder head 69, which ensures easy access for adjusting the stop nut 74 on the threaded section 75.
  • the largest adjustable angle of rotation of the pinion shaft 2 results from the approach of the stop strip 13 to the stop surfaces 19 when the stop bushes 17 are in their outermost position of use.
  • the guide pin 37 never touches the cover 24.
  • the clearance between the toothed rack 4, the pinion shaft 2 and the toothed piston 3 is removed, for example, when the toothed piston is moved to the left in that both the shock absorber tappet 14a and the stop surface 19 in the end position Counteract the direction of movement of the rack 4 via its stop strips 13.
  • the play between the teeth automatically sets itself to zero.
  • the piston 55 projects with the buffer 64 attached to it into the working space 25 when the chambers 70 and 73 are filled with pressure medium. If the toothed piston 3 is now shifted to the left in this state, the shock absorber tappet 14a will counteract the direction of movement of the toothed rack 4 over part of the distance b, but the end of the movement only takes place when the guide pin 37 rests on the damper 64. As described above, the play between the toothings is then automatically reset to zero.
  • the exemplary embodiment of a rotary drive according to FIG. 5 differs from that according to FIG. 1 only by an internal air supply through the pinion shaft 2a to a tool, not shown in more detail, which is actuated by pressure medium.
  • This can be a gripping device, for example.
  • the lines 84 and 85 are arranged approximately axially parallel in the pinion shaft 2a, the line 85 running somewhat angled.
  • the pinion shaft 2a engages with a shaft section 86 in an extension 87 and is guided there in a sealing manner.
  • a plurality of circumferential channels are formed in the shaft section 86, two channels 88 and 89 each being connected to the lines 84 and 85 by corresponding radial bores.
  • the channels 88 and 89 are each assigned feed lines 90 and 91 in the extension 87, via which pressure medium can be brought into correspondingly closed radial bores 92 and 93 and via these also into the channels 88 and 89.
  • the channels 88 and 89 are laterally delimited by further channels with ring seals.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Transmission Devices (AREA)

Claims (18)

  1. Dispositif d'entraînement pour actionner un arbre de pignon (2) à denture droite, par l'intermédiaire d'une crémaillère (4) reliée des deux côtés à des pistons (23) logés chacun dans un cylindre (22) en formant une chambre de travail (25) pouvant recevoir un fluide de pression et être obturée par un couvercle (24) ou un piston (55), la crémaillère (4) et le piston à denture (3) pouvant présenter un mouvement relatif tout en étant l'un et l'autre en prise par leurs dentures avec l'arbre de pignon (2),
    caractérisé en ce qu'
    une butée (37, 24 ; 13, 19) est associée à la crémaillère (4) pour limiter son mouvement par rapport au piston à denture (3), dans leurs positions finales.
  2. Dispositif d'entraînement selon la revendication 1,
    caractérisé en ce que
    la crémaillère (4) est logée dans un évidement longitudinal (6) du piston à denture (3) de manière à pouvoir coulisser dans celui-ci.
  3. Dispositif d'entraînement selon les revendications 1 ou 2,
    caractérisé en ce que
    la crémaillère (4) est guidée de chaque côté par une tige de guidage (37) coulissant dans des alésages correspondants (35) du pignon à denture (3) et des pistons (23).
  4. Dispositif d'entraînement selon la revendication 3,
    caractérisé en ce que
    la tige de guidage (37) dépasse le piston (23) d'une certaine longueur (c).
  5. Dispositif d'entraînement selon une des revendications 2 à 4,
    caractérisé en ce que
    une face frontale (7, 8) de la crémaillère (4) est située à une distance variable (a) d'une paroi interne (9, 10) de l'évidement (6).
  6. Dispositif d'entraînement selon au moins une des revendications 1 à 5
    caractérisé en ce que
    la crémaillère (4) comporte une partie dentée (12) sur laquelle dépasse une barrette de butée (13), à laquelle est associée au moins une butée (17).
  7. Dispositif d'entraînement selon la revendication 6,
    caractérisé en ce que
    la butée est une douille (17) pouvant contenir un amortisseur de choc (15), la barrette de butée (13), lorsqu'elle se déplace, venant rencontrer un poussoir (14) de l'amortisseur.
  8. Dispositif d'entraînement selon la revendication 7,
    caractérisé en ce que
    la douille (17) constitue une surface de butée (19) pour la barrette de butée (13).
  9. Dispositif d'entraînement selon la revendication 7 ou 8,
    caractérisé en ce que
    la distance (d) entre la douille de butée (17) et la barrette de butée (13) peut varier.
  10. Dispositif d'entraînement selon au moins une des revendications 6 à 9,
    caractérisé en ce que
    à la douille de butée (17) et/ou à la barrette de butée est associé au moins un contacteur de proximité.
  11. Dispositif d'entraînement selon au moins une des revendications 1 à 10,
    caractérisé en ce que
    l'on peut munir le cylindre (22) d'une butée intermédiaire (52).
  12. Dispositif d'entraînement selon la revendication 11,
    caractérisé en ce que
    la butée intermédiaire (52) est constituée d'un tube (53) et d'un piston (55) à monter respectivement sur et dans le cylindre (22).
  13. Dispositif d'entraînement selon la revendication 12,
    caractérisé en ce que
    au piston (55) est reliée une tige de piston (60) traversant un couvercle intermédiaire (57) qui délimite avec le piston (55) une chambre de pression (73).
  14. Dispositif d'entraînement selon la revendication 13,
    caractérisé en ce que
    la tige de piston (60) présente à une certaine distance du piston (55) une partie filetée (75), sur laquelle est monté un écrou de butée réglable (74).
  15. Dispositif d'entraînement selon la revendication 13 ou 14,
    caractérisé en ce que
    sur la tige de piston (60), après le couvercle intermédiaire (57), est monté un piston d'entraînement (66), qui délimite avec une tête de cylindre (69) une autre chambre de pression (70).
  16. Dispositif d'entraînement selon la revendication 15,
    caractérisé en ce que
    les deux chambres de pression (70, 73) sont reliées à une source de fluide sous pression par l'intermédiaire d'une conduite (71) et d'un perçage longitudinal (72) pratiqué dans la tige de piston (60).
  17. Dispositif d'entraînement selon la revendication 16,
    caractérisé en ce que
    un autre perçage longitudinal (81) est pratiqué dans la tige de piston (60) pour amener du fluide sous pression dans la chambre de travail (25).
  18. Dispositif d'entraînement selon au moins une des revendications 1 à 17,
    caractérisé en ce que
    il est prévu, dans l'arbre de pignon (20) au moins une conduite d'amenée de fluide sous pression (84, 85).
EP94119010A 1993-12-17 1994-12-02 Entraînement pour actionner un arbre de pignon Expired - Lifetime EP0663261B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4343184A DE4343184A1 (de) 1993-12-17 1993-12-17 Antrieb zum Drehen einer Ritzelwelle
DE4343184 1993-12-17

Publications (2)

Publication Number Publication Date
EP0663261A1 EP0663261A1 (fr) 1995-07-19
EP0663261B1 true EP0663261B1 (fr) 1997-03-19

Family

ID=6505341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94119010A Expired - Lifetime EP0663261B1 (fr) 1993-12-17 1994-12-02 Entraînement pour actionner un arbre de pignon

Country Status (3)

Country Link
US (1) US5560282A (fr)
EP (1) EP0663261B1 (fr)
DE (2) DE4343184A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2309747A (en) * 1996-02-03 1997-08-06 Hytek Tech Int Fluid-pressure-operated actuators
FI19992608A (fi) 1999-12-03 2001-06-04 Neles Controls Oy Kalvotoimilaite
JP2001295907A (ja) * 2000-04-12 2001-10-26 Smc Corp ラック・ピニオン式揺動装置のバックラッシ吸収機構
ITBS20060041A1 (it) * 2006-02-28 2007-09-01 Gimatic Spa Attuatore rotante pneumatico
GB2437531B (en) * 2006-04-26 2008-03-26 Forac Ltd Actuator with spring return piston
CN103240635A (zh) * 2013-05-20 2013-08-14 云南省机械研究设计院 提高自动转换铣头分度精度的驱动及传动方法
JP6252952B2 (ja) 2015-05-11 2017-12-27 Smc株式会社 ロータリーアクチュエータ
CN112777537B (zh) * 2021-02-15 2023-11-28 山西高行液压股份有限公司 重载驱动装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1300428A (fr) * 1961-08-09 1962-08-03 Schwermaschb Karl Liebknecht V Piston hydraulique denté
US3179015A (en) * 1963-02-11 1965-04-20 Ingersoll Rand Co Control for rock drill mounting
US3444784A (en) * 1966-12-19 1969-05-20 Robert L Wengerd Fluid motor rotary actuator
FR2525785A1 (fr) * 1982-04-21 1983-10-28 Snecma Dispositif de rattrapage de jeu pour moyen de transmission a cremaillere
US4683805A (en) * 1985-03-25 1987-08-04 Flo-Tork, Inc. Rotary actuator having integral piston assembly with floating rack
US4627331A (en) * 1985-05-31 1986-12-09 Flo-Tork, Inc. Rotary actuator having cast piston and arcuate rack bearing
US4884495A (en) * 1988-06-20 1989-12-05 El-O-Matic-Usa, Inc. Fluid motor actuator with compression spring fail-safe mechanism
EP0449803A1 (fr) * 1990-03-28 1991-10-02 Hoerbiger Fluidtechnik Kg Entraînement pivotant
DE9007387U1 (de) * 1990-05-19 1991-08-29 Specken AG, Urdorf Pneumatischer Drehantrieb
US5189923A (en) * 1992-01-24 1993-03-02 Bimba Manufacturing Company Antibacklash rack assembly

Also Published As

Publication number Publication date
DE59402147D1 (de) 1997-04-24
EP0663261A1 (fr) 1995-07-19
DE4343184A1 (de) 1995-06-22
US5560282A (en) 1996-10-01

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