EP1331403B1 - Stator blade control apparatus - Google Patents

Stator blade control apparatus Download PDF

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Publication number
EP1331403B1
EP1331403B1 EP03290059A EP03290059A EP1331403B1 EP 1331403 B1 EP1331403 B1 EP 1331403B1 EP 03290059 A EP03290059 A EP 03290059A EP 03290059 A EP03290059 A EP 03290059A EP 1331403 B1 EP1331403 B1 EP 1331403B1
Authority
EP
European Patent Office
Prior art keywords
link
pivot
face
clamping cap
lateral faces
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
EP03290059A
Other languages
German (de)
French (fr)
Other versions
EP1331403A1 (en
Inventor
Michel Bouru
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.)
Safran Aircraft Engines SAS
Original Assignee
SNECMA SAS
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Publication date
Application filed by SNECMA SAS filed Critical SNECMA SAS
Publication of EP1331403A1 publication Critical patent/EP1331403A1/en
Application granted granted Critical
Publication of EP1331403B1 publication Critical patent/EP1331403B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F01D17/162—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes for axial flow, i.e. the vanes turning around axes which are essentially perpendicular to the rotor centre line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/56—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/563—Fluid-guiding means, e.g. diffusers adjustable specially adapted for elastic fluid pumps
    • 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
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32008—Plural distinct articulation axes
    • Y10T403/32057—Angular and linear
    • Y10T403/32073—Pivot stud slidable in elongated opening
    • 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
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32114—Articulated members including static joint
    • Y10T403/32163—Articulate joint intermediate end joints
    • Y10T403/32172—Variable angle
    • 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
    • Y10T403/00—Joints and connections
    • Y10T403/50—Bridged by diverse connector
    • 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
    • Y10T403/00—Joints and connections
    • Y10T403/54—Flexible member is joint component

Definitions

  • the present invention relates to a blade control device variable pitch angle. As defined in the preamble of claim 1.
  • a blade control device is known from the document US-A-5,024,580 . It finds a particular application in the field of aeronautics, in particular for the control of the angular positions of air inlet guide vanes in turbomachine compressors, such as aircraft turbomachines.
  • Known devices for controlling variable pitch vanes in a turbomachine usually comprise a control member in the form of a ring surrounding a casing of the turbomachine and a plurality of levers or links, each link having a first end connected to the turbine engine. control ring by a hinge and a second end mounted on the pivot of a respective blade.
  • the synchronized modification of the angular position of the blades is made by rotation of the ring around the axis of the turbomachine.
  • the connection between each link and the ring comprises at least one degree of freedom in rotation about an axis directed substantially radially relative to the ring.
  • the link being rigidly mounted on the pivot of the corresponding blade, the rotation of the ring induces other relative movements between the ring and the portion of the rod mounted on the pivot of the blade.
  • connection in the form of a ball or a similar part which, in addition to the rotation around a substantially radial axis relative to the ring, allows rotation about an axis having a substantially circumferential direction relative to the ring. It has also been proposed to provide a link providing an additional degree of freedom in translation in a substantially radial direction relative to the ring.
  • the present invention therefore aims to overcome such drawbacks by providing a control device using fastening means of the link which can maintain without play it on the pivot of the blade.
  • An object of the invention is also to eliminate the drive imprecision.
  • variable pitch angle control device for a turbomachine compressor rectifier according to claim 1 is provided.
  • the clamping means comprise a clamping cap applied on the second end of the rod and subjected to an axial clamping force under the effect of the fastening means.
  • This clamping cap has a radial passageway which has at least one inner lateral face which is inclined with respect to a median longitudinal plane of this passage and which cooperates with a lateral face of the second end of the link to produce the clamping force .
  • the clamping cap exerts this pinching force through contact elements interposed between at least one inclined inner lateral face of the clamping cap and a corresponding lateral face of the second end of the link.
  • the contact elements may be either in the form of at least one flexible tongue protruding longitudinally on one side of a central block of the pivot, or at least one wedge interposed between the clamping cap and a side face of the second end of the link.
  • the second end of the link may have a U-shaped section with two wings applied against side surfaces of a central block of the pivot.
  • the fixing means may comprise a screw passing successively through a first orifice formed in the second end of the link, a second orifice formed in the clamping cap and a third orifice formed in the pivot of the blade.
  • the fixing means may be composed of a screw-nut system comprising a threaded rod integral with the blade pivot and on which is screwed an axial clamping nut.
  • the figure 1 represents, in a very partial manner, a part of a turbomachine, for example an airplane turbojet, provided with blades 2 with variable pitch angle. These vanes are, for example, guide vanes at the turbomachine compressor inlet, distributed around the axis of the turbomachine. On this figure 1 only one dawn is represented.
  • the control of the angular positions of the blades 2 is achieved by a control ring 4 surrounding a casing 6 of the turbomachine (shown only partially on the figure 1 ) and a plurality of rods 20.
  • Each rod 20 has a first end 20a connected to the control ring 4 by connecting means forming articulation.
  • this articulation is performed by an axis or finger 8 passing through the first end 20a of the rod 20 and engaged in a radial housing 10 of the control ring 4.
  • a second end 20b of the rod 20 is mounted on a pivot 30 of the blade 2 by means of fastening means 12.
  • These fastening means 12 conventionally comprise an attached screw 14 and a self-locking bushing (not shown) implanted in the pivot of the dawn. If the height of the pivot of the blade does not allow the installation of a self-locking bushing, one can also provide fastening means in the form of a screw-nut system (not shown) comprising a threaded rod secured to the pivot of the blade and on which is screwed an axial clamping nut.
  • clamping means which act transversely with respect to a median longitudinal plane P of the rod for locking in rotation without play the second end 20b of the rod 20 on the pivot of the blade.
  • These clamping means comprise a clamping cap 40 applied on the second end 20b of the rod 20 and on the pivot of the blade by the fastening means 12.
  • the end 20b of the rod and the pivot 30 of the dawn are transversely mutual support by lateral faces substantially parallel to the plane P.
  • the cap 40 has at least one inner lateral face inclined relative to the median longitudinal plane P of the rod which cooperates with a corresponding inclined face of the second end 20b of the rod or the pivot 30 or a contact element interposed between the end portion 20b of the link and the pivot 30. Under the effect of the axial clamping of the cap 40, the inclined faces cooperate with each other to produce the effort of transverse pinch of the end 20b of the rod on the pivot of the blade.
  • the pivot 30 of the blade of the control device comprises a rigid lateral portion 31 protruding longitudinally from an upper face 32 of the pivot 30 adjacent an edge thereof.
  • This rigid portion is made in one piece with the pivot 30, has an inner plane lateral face 31a substantially parallel to the plane P and a planar outer side face 31b which is inclined with respect to the plane P.
  • the internal flat lateral face 31a of the rigid part may also be slightly inclined relative to the plane P to allow better maintenance of the rod 20 on the pivot 30.
  • the second end 20b of the rod 20 has an orifice 21 in which the screw 14 (or a threaded rod secured to the pivot of the blade) engages with play and rests on the face 32 of the pivot 30.
  • This end 20b of the link has a first lateral face 22a which is substantially parallel to the longitudinal median plane P of the rod and which rests on the internal flat lateral face 31a of the rigid portion 31, and a second lateral face 22b which is inclined relative to on the plane P.
  • the clamping cap 40 has a substantially cylindrical portion 42 extended at its lower part by a flange 44. At its upper part, the cap 40 has an orifice 46 in which the screw 14 (or the threaded rod) engages.
  • a transverse passage 48 is formed in the cylindrical portion 42 of the cap for housing the second end 20b of the rod 20 and the rigid portion 31 of the pivot 30.
  • the passage 48 is bordered by two inclined lateral faces 48a, 48b having inclinations corresponding to those of the faces 22b, 31b and based thereon.
  • the screw 14 is inserted successively into the orifice 46 of the clamping cap, into the orifice 21 of the second end of the rod and into an orifice (not shown) formed axially in the pivot of the blade.
  • the threaded rod secured to the pivot of the blade also passes through the orifice 21 of the second end of the rod and the orifice 46 of the clamping cap.
  • the cap 40 has a substantially symmetrical shape exerting a symmetrical clamping force with the two inclined side faces 48a, 48b bordering the passage 48.
  • only the lateral face 48a can be inclined to cooperate with the face 22b of the second end 20b of the link, the other face 48b being parallel to the plane P, as well as the face 31b.
  • the pivot 30 of the blade of the control device further comprises, with respect to the first embodiment described above, a flexible lateral tab 33 protruding longitudinally from the upper face 32 of the pivot 30 and arranged substantially symmetrically at the rigid portion 31 relative to the median longitudinal plane P of the link.
  • This flexible tongue 33 is made in one piece with the pivot 30 and has an inner side face 33a substantially parallel to the plane P and an outer side face 33b inclined relative to the plane P.
  • the second end 20b of the rod 20 is supported on the upper face 32 of the pivot 30.
  • the first lateral face 22a of the end 20b of the rod is parallel to the plane P and bears on the inner lateral face 31a of the rigid part 31, and the second lateral face 22b of this same end 20b is also parallel to the plane P and rests on the internal lateral face 33a of the flexible tongue 33.
  • the screw 14 is introduced successively into the orifice 46 of the clamping cap, into the orifice 21 of the second end of the rod and into the orifice formed in the pivot of the blade.
  • the threaded rod integral with the pivot of the dawn crosses also the orifice 21 of the second end of the rod and the orifice 46 of the clamping cap.
  • the cap 40 has a transverse passage 48 formed in the cylindrical portion 42 of the cap with two inclined side faces 48a, 48b which have inclinations corresponding to those of the faces 33b, 31b and are based on those -this.
  • the inclined outer side face 33b of the flexible tongue 33 and the inclined side face 48a of the passage 48 of the clamping cap 40 have been shown planar. Of course, one can also imagine that these two faces are substantially conical. Similarly, the outer side face 31b of the rigid portion 31 and the inclined side face 48b of the passage 48 of the weaning cap 40 may also be substantially conical.
  • the pivot 30 of the blade of the control device has two slots 34a, 34b substantially parallel to the plane P and formed between a central block 35 of the pivot 30 and two thinned side portions 36a, 36b forming flexible tongues.
  • These thinned lateral portions each comprise an external lateral face, respectively 37a and 37b, inclined with respect to the median longitudinal plane P of the rod.
  • the second end 20b of the rod 20 is supported on the upper face 32 of the central block 35 of the pivot 30.
  • This end 20b has a U-shaped section with two wings 24a and 24b respectively engaged in the slots 34a, 34b of the pivot 30 of dawn.
  • the screw 14 is introduced successively into the orifice 46 of the clamping cap, into the orifice 21 of the second end of the rod and in the hole made in the pivot of the dawn.
  • the threaded rod secured to the pivot of the blade also passes through the orifice 21 of the second end of the rod and the orifice 46 of the clamping cap.
  • the two inclined lateral faces 48a, 48b of the passage 48 formed in its cylindrical portion 42 have inclinations corresponding to those of the inclined outer lateral faces 37a, 37b of the flexible tongues 36a, 36b and rest thereon.
  • the inclined lateral faces 48a, 48b of the cap 40 exert a bearing on the inclined lateral faces 37a, 37b of the flexible tongues. to obtain a transverse clamping force of the wings 24a, 24b of the second end 20b of the rod in the slots 34a, 34b of the pivot of the blade.
  • the flexibility of the flexible tongues 36a, 36b is thus used to exert by the clamping cap an indirect clamping force on the second end 20b of the rod 20.
  • the inclined lateral faces 37a, 37b of the flexible tongues make it possible to transmit this effort of clamping generated by the fastening means 12 symmetrically with respect to the plane P.
  • the rod 20 is locked in rotation without play on the pivot 30 of the blade.
  • the pivot 30 of the blade of the control device has a block 35 with two flat lateral faces 38a, 38b substantially parallel to the plane P and symmetrical with respect to this same plane P.
  • the second end 20b of the rod 20 bears on the upper face 32 of the block 35.
  • This end 20b has a U-shaped section with two wings 24a, 24b which rest on the corresponding flat lateral faces 38a, 38b of the pivot 30 of the dawn.
  • Wedges 50a, 50b are interposed between the inclined lateral faces 48a, 48b of the transverse passage 48 formed in the cylindrical portion 42 of the clamping cap 40 and the wings 24a, 24b of the second end 20b of the link.
  • These shims 50a, 50b comprise, in their upper part, first external lateral faces 51a, 51b inclined with respect to the plane P.
  • the screw 14 is introduced successively into the orifice 46 of the clamping cap, into the orifice 21 of the second end of the rod and in the hole made in the pivot of the dawn.
  • the threaded rod secured to the pivot of the blade also passes through the orifice 21 of the second end of the rod and the orifice 46 of the clamping cap.
  • the two inclined side faces 48a, 48b of the passage 48 formed in its cylindrical portion 42 have inclinations corresponding to those of the first inclined outer lateral faces 51a, 51b of the wedges 50a, 50b and bear thereon.
  • a transverse clamping force of the flanges 24a, 24b of the second end 20b of the link on the flat lateral faces 38a, 38b of the pivot 30 is exerted by supporting the inclined side faces 48a, 48b of the cap 40 on the wedges 50a, 50b.
  • the clamping cap 40 thus exerts an indirect clamping force on the second end 20b of the link 20 by bearing on the first outer lateral faces 51a, 51b of the wedges.
  • the rod 20 is locked in rotation without play on the pivot 30 of the blade.
  • the shims 50a, 50b advantageously have, in their lower part, second outer lateral faces 52a, 52b supported on corresponding faces of the pivot 30 of the blade.
  • These second outer lateral faces 52a, 52b are preferably inclined relative to the plane P and have inclinations of opposite angles to those of the first inclined external lateral faces 51a, 51b, for example symmetrical thereof with respect to a transverse plane median of the holds 50a, 50b.
  • the inclined side faces 52a, 52b bear on corresponding inclined faces formed in grooves 39a, 39b which border the central block 35 of the pivot.
  • the shims 50a, 50b are maintained by means of which the gripping force of the clamping cap is exerted in a direction substantially normal to the flat lateral faces 38a, 38b of the pivot of the blade and at a height which depends on the design of shims 50a, 50b (angle value of their inclined faces, choice of their positioning in the assembly Vietnamese).
  • the first outer lateral face 51a, 51b of each of the two wedges 50a, 50b is of substantially curvilinear section.
  • the wings 24a, 24b are folded at their ends to form flanges 25a, 25b housed in grooves 39'a, 39'b which border the central block 35 of the pivot. This arrangement contributes to the immobilization without play of the rod 20 on the pivot 30.
  • the pivot 30 of the blade of the control device also has a central block 35 with two flat lateral faces 38a, 38b substantially parallel to the plane P and symmetrical with respect to the same plane P.
  • the second end 20b of the rod 20 is supported on the upper face 32 of the block 35 of the pivot 30.
  • This end 20b has a U-shaped section with two wings 24a, 24b which rest on the flat lateral faces 38a, 38b.
  • Ribs 26a, 26b are integrally formed with wings 24a, 24b on the outer faces thereof. These ribs 26a, 26b have external lateral faces 27a, 27b inclined relative to the plane P.
  • the screw 14 is introduced successively into the orifice 46 of the clamping cap, into the orifice 21 of the second end of the rod and into the orifice formed in the pivot of the blade.
  • the threaded rod secured to the pivot of the blade also passes through the orifice 21 of the second end of the rod and the orifice 46 of the clamping cap.
  • the inclined side faces 48a, 48b of the passage 48 formed in the cap 40 have inclinations corresponding to those of the outer lateral faces 27a, 27b of the ribs 26a, 26b.
  • a transverse clamping force of the wings 24a, 24b of the second end 20b of the link is exerted on the faces.
  • lateral planar 38a, 38b of the pivot 30 by supporting the inclined side faces 48a, 48b of the clamping cap 40 on the side faces 27a, 27b of the ribs 26a, 26b.
  • the clamping cap 40 thus exerts a direct clamping force on the second end 20b of the rod 20 by bearing on the outer lateral faces of the ribs 26a, 26b.
  • the second end 20b of the rod 20 is locked in rotation without play on the pivot 30 of the blade.
  • the clamping cap 40 has a substantially cylindrical portion 42.
  • this cylindrical portion can for example be replaced by a substantially rectangular portion, the clamping means acting in this case identically.
  • the control device may comprise a bushing 60 disposed around the pivot 30 of the blade, between the clamping cap 40 and the flange 62 of an opening of the casing 6 of the turbomachine in which the pivot 30 of the turbine engine 30 is mounted.
  • This bushing 60 is intended to allow a centering of the pivot of the blade in the opening of the housing.
  • the clamping cap 40 also bears at its periphery on the bushing 60.
  • a shim 64 for adjusting the clearance interposed between the clamping cap 40 and the bushing 60 can then advantageously be provided in order to take account of the a possible axial play between these parts.
  • an anti-friction washer 66 may be disposed between the flange 62 of the opening of the housing 6 and the base of the pivot 30 of the blade.
  • the length of the control rod may be greater than the usual standards. It is then necessary to provide an adjustment of the axial clearance (for example of the order of 0.10 mm) between the upper surface of the second end 20b of the link 20 on which the clamping cap 40 is applied and the latter .
  • this adjustment can be obtained by interposing between these two elements a complementary piece (not shown in the figures) acting as a spacer, possibly with effect. spring.
  • This spacer can for example be made by a circular part. The presence of such a spacer is however not necessary for the control devices described in the first and fifth embodiments of the invention.
  • asymmetry of the lateral faces 22a, 22b or wings 24a, 24b of the rod 20 with respect to its median plane P in order to provide a foolproofing between an edge. attack and a trailing edge of the link.
  • asymmetry of position illustrated for example by figures 3 and 5 it is meant that the distance D1 between one of the lateral faces 22a, 22b (or wings 24a, 24b) of the rod 20 and the median plane P is greater or smaller than the distance D2 between the other lateral face 22a, 22b (or wing 24a, 24b) and the median plane P.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Clamps And Clips (AREA)

Description

Arrière-plan de l'inventionBackground of the invention

La présente invention concerne un dispositif de commande d'aubes à angle de calage variable. Comme définit dans le préambule de la revendication 1. Un tel dispositif est connu du document US-A-5 024 580 . Il trouve une application particulière dans le domaine de l'aéronautique, notamment pour la commande des positions angulaires d'aubes directrices d'entrée d'air dans des compresseurs de turbomachine, telles que des turbomachines d'avion.The present invention relates to a blade control device variable pitch angle. As defined in the preamble of claim 1. Such a device is known from the document US-A-5,024,580 . It finds a particular application in the field of aeronautics, in particular for the control of the angular positions of air inlet guide vanes in turbomachine compressors, such as aircraft turbomachines.

Les dispositifs connus pour la commande d'aubes à calage variable dans une turbomachine comportent habituellement un organe de commande sous forme d'un anneau entourant un carter de la turbomachine et une pluralité de leviers ou biellettes, chaque biellette ayant une première extrémité reliée à l'anneau de commande par une articulation et une deuxième extrémité montée sur le pivot d'une aube respective.Known devices for controlling variable pitch vanes in a turbomachine usually comprise a control member in the form of a ring surrounding a casing of the turbomachine and a plurality of levers or links, each link having a first end connected to the turbine engine. control ring by a hinge and a second end mounted on the pivot of a respective blade.

La modification synchronisée de la position angulaire des aubes est réalisée par rotation de l'anneau autour de l'axe de la turbomachine. Afin de pouvoir suivre le mouvement de rotation de l'anneau, la liaison entre chaque biellette et l'anneau comprend au moins un degré de liberté en rotation autour d'un axe dirigé sensiblement radialement par rapport à l'anneau. Toutefois, la biellette étant montée rigidement sur le pivot de l'aube correspondante, la rotation de l'anneau induit d'autres mouvements relatifs entre l'anneau et la partie de la biellette montée sur le pivot de l'aube. Afin de s'accommoder de ces mouvements supplémentaires, ou d'au moins une partie d'entre eux, il est bien connu de réaliser la liaison sous forme d'une rotule ou d'une pièce analogue qui, outre la rotation autour d'un axe sensiblement radial par rapport à l'anneau, autorise une rotation autour d'un axe ayant une direction sensiblement circonférentielle par rapport à l'anneau. Il a aussi été proposé de réaliser une liaison offrant un degré de liberté supplémentaire en translation dans une direction sensiblement radiale par rapport à l'anneau. On pourra, en autres, se référer aux documents FR-A-2 608 678 ou FR-A-2 746 141 .The synchronized modification of the angular position of the blades is made by rotation of the ring around the axis of the turbomachine. In order to follow the rotational movement of the ring, the connection between each link and the ring comprises at least one degree of freedom in rotation about an axis directed substantially radially relative to the ring. However, the link being rigidly mounted on the pivot of the corresponding blade, the rotation of the ring induces other relative movements between the ring and the portion of the rod mounted on the pivot of the blade. In order to accommodate these additional movements, or at least part of them, it is well known to make the connection in the form of a ball or a similar part which, in addition to the rotation around a substantially radial axis relative to the ring, allows rotation about an axis having a substantially circumferential direction relative to the ring. It has also been proposed to provide a link providing an additional degree of freedom in translation in a substantially radial direction relative to the ring. We can, in other words, refer to the documents FR-A-2,608,678 or FR-A-2,746,141 .

On connaît également le brevet US 6,019,574 qui propose de réaliser l'articulation mécanique entre le pivot de l'aube et l'extrémité de la biellette montée sur celui-ci par un système de tenon et de mortaise : le pivot de l'aube comporte une extrémité filetée qui traverse un orifice percé dans la biellette de commande. Un écrou serré sur l'extrémité filetée du pivot permet de lier en rotation l'ensemble de ces pièces. De même, la demande de brevet européen EP 1 010 862 décrit une articulation obtenue par des ergots d'entraînement solidaires du pivot de l'aube et traversant des encoches pratiquées sur l'extrémité de la biellette montée sur le pivot. L'ensemble est également maintenu en rotation par un écrou vissé sur une extrémité filetée du pivot de l'aube. US 5, 024, 580 décrit une articulation réalisée par un chapeau serré par une vis sur l'extrémité de la biellette.We also know the US Patent 6,019,574 which proposes to realize the mechanical articulation between the pivot of the blade and the end of the link mounted thereon by a system of tenon and mortise: the pivot of the blade has a threaded end which passes through an orifice pierced in the control rod. A nut tightened on the threaded end of the pivot makes it possible to bind all these parts in rotation. Similarly, the request for European patent EP 1 010 862 describes a joint obtained by integral drive pins of the blade pivot and through notches formed on the end of the rod mounted on the pivot. The assembly is also maintained in rotation by a nut screwed onto a threaded end of the blade pivot. US 5, 024, 580 describes a joint made by a cap tightened by a screw on the end of the link.

Toutefois, dans ces documents, la précision d'entraînement en rotation de la biellette de commande par rapport au pivot de l'aube varie de 0,4° à 0,6° en pratique courante. Cette faible précision provient du fait qu'il existe, entre les différentes pièces, des jeux dus aux tolérances d'assemblage du dispositif de commande. Un jeu s'installe notamment entre le pivot et l'extrémité de la biellette montée sur celui-ci. Il en résulte une imprécision au niveau de l'entraînement de la biellette qui est particulièrement préjudiciable au bon fonctionnement de l'ensemble.However, in these documents, the precision of rotation of the control rod relative to the pivot of the blade varies from 0.4 ° to 0.6 ° in common practice. This low accuracy comes from the fact that there are games between the different parts due to the assembly tolerances of the control device. A game is installed in particular between the pivot and the end of the rod mounted on it. This results in inaccuracy in the drive of the rod which is particularly detrimental to the proper functioning of the assembly.

Objet et résumé de l'inventionObject and summary of the invention

La présente invention vise donc à pallier de tels inconvénients en proposant un dispositif de commande utilisant des moyens de fixation de la biellette qui permettent de maintenir sans jeu celle-ci sur le pivot de l'aube. Un but de l'invention est aussi de supprimer l'imprécision d'entraînement.The present invention therefore aims to overcome such drawbacks by providing a control device using fastening means of the link which can maintain without play it on the pivot of the blade. An object of the invention is also to eliminate the drive imprecision.

A cet effet, il est prévu un dispositif de commande d'aube à angle de calage variable pour redresseur de compresseur de turbomachine selon la revendication 1.For this purpose, a variable pitch angle control device for a turbomachine compressor rectifier according to claim 1 is provided.

De la sorte, on élimine tout risque de jeu entre le pivot de l'aube et l'extrémité de la biellette montée sur celui-ci. La précision d'entraînement en rotation entre la biellette et le pivot de l'aube est donc améliorée.In this way, there is eliminated any risk of play between the pivot of the blade and the end of the rod mounted thereon. The precision of rotation drive between the rod and the pivot of the blade is thus improved.

Les moyens de pincement comportent un chapeau de serrage appliqué sur la deuxième extrémité de la biellette et soumis à un effort de serrage axial sous l'effet des moyens de fixation. Ce chapeau de serrage présente un passage radial qui possède au moins une face latérale interne qui est inclinée par rapport à un plan longitudinal médian de ce passage et qui coopère avec une face latérale de la deuxième extrémité de la biellette pour produire l'effort de pincement.The clamping means comprise a clamping cap applied on the second end of the rod and subjected to an axial clamping force under the effect of the fastening means. This clamping cap has a radial passageway which has at least one inner lateral face which is inclined with respect to a median longitudinal plane of this passage and which cooperates with a lateral face of the second end of the link to produce the clamping force .

Le chapeau de serrage exerce cet effort de pincement au travers d'éléments de contact interposés entre au moins une face latérale interne inclinée du chapeau de serrage et une face latérale correspondante de la deuxième extrémité de la biellette.The clamping cap exerts this pinching force through contact elements interposed between at least one inclined inner lateral face of the clamping cap and a corresponding lateral face of the second end of the link.

Les éléments de contact peuvent être soit sous forme d'au moins une languette flexible faisant saillie longitudinalement sur un côté d'un bloc central du pivot, soit d'au moins une cale interposée entre le chapeau de serrage et une face latérale de la deuxième extrémité de la biellette.The contact elements may be either in the form of at least one flexible tongue protruding longitudinally on one side of a central block of the pivot, or at least one wedge interposed between the clamping cap and a side face of the second end of the link.

La deuxième extrémité de la biellette peut avoir une section en forme de U avec deux ailes appliquées contre des surfaces latérales d'un bloc central du pivot.The second end of the link may have a U-shaped section with two wings applied against side surfaces of a central block of the pivot.

Afin d'assurer un détrompage entre un bord d'attaque et un bord de fuite de la biellette, il peut exister une asymétrie de position des faces latérales ou des ailes de la biellette par rapport au plan médian.In order to provide a keying between a leading edge and a trailing edge of the rod, there may be asymmetrical position of the lateral faces or wings of the rod relative to the median plane.

Les moyens de fixation peuvent comporter une vis traversant successivement un premier orifice formé dans la deuxième extrémité de la biellette, un second orifice formé dans le chapeau de serrage et un troisième orifice formé dans le pivot de l'aube. En variante, les moyens de fixation peuvent être composés d'un système vis-écrou comprenant une tige filetée solidaire du pivot de l'aube et sur laquelle est vissé un écrou de serrage axial.The fixing means may comprise a screw passing successively through a first orifice formed in the second end of the link, a second orifice formed in the clamping cap and a third orifice formed in the pivot of the blade. Alternatively, the fixing means may be composed of a screw-nut system comprising a threaded rod integral with the blade pivot and on which is screwed an axial clamping nut.

Brève description des dessinsBrief description of the drawings

D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-dessous, en référence aux dessins annexés qui en illustrent plusieurs exemples de réalisation dépourvus de tout caractère limitatif. Sur les figures :

  • la figure 1 est une vue en partie en coupe longitudinale d'un premier mode de réalisation d'un dispositif de commande selon l'invention ;
  • la figure 2 est une vue en perspective et en écorché du dispositif de la figure 1 ;
  • la figure 3 est une vue en coupe selon le plan III-III de la figure 2 ;
  • la figure 4 est une vue en perspective et en écorché d'un dispositif de commande selon un deuxième mode de réalisation de l'invention ;
  • la figure 5 est une vue en coupe selon la plan V-V de la figure 4;
  • la figure 6 est une vue en perspective et en écorché d'un troisième mode de réalisation d'un dispositif de commande selon l'invention ;
  • la figure 7 est une vue en coupe selon le plan VII-VII de la figure 6 ;
  • la figure 8 est une vue en perspective et en écorché d'un dispositif de commande selon un quatrième mode de réalisation de l'invention ;
  • les figures 9a et 9b sont des vues en coupe selon le plan IX-IX de la figure 8 montrant deux variantes de réalisation différentes ;
  • la figure 10 est une vue en perspective et en écorché d'un cinquième mode de réalisation d'un dispositif de commande selon l'invention ; et
  • la figure 11 est une vue en coupe selon le plan XI-XI de la figure 10.
Other features and advantages of the present invention will emerge from the description given below, with reference to the accompanying drawings which illustrate several embodiments having no limiting character. In the figures:
  • the figure 1 is a view partly in longitudinal section of a first embodiment of a control device according to the invention;
  • the figure 2 is a perspective view and skinned of the device of the figure 1 ;
  • the figure 3 is a sectional view according to plane III-III of the figure 2 ;
  • the figure 4 is a perspective and cut away view of a control device according to a second embodiment of the invention;
  • the figure 5 is a sectional view along the VV plane of the figure 4 ;
  • the figure 6 is a perspective and cutaway view of a third embodiment of a control device according to the invention;
  • the figure 7 is a sectional view along plane VII-VII of the figure 6 ;
  • the figure 8 is a perspective and cutaway view of a control device according to a fourth embodiment of the invention;
  • the Figures 9a and 9b are sectional views according to plan IX-IX of the figure 8 showing two different embodiments;
  • the figure 10 is a perspective and cutaway view of a fifth embodiment of a control device according to the invention; and
  • the figure 11 is a sectional view according to plan XI-XI of the figure 10 .

Description détaillée de plusieurs modes de réalisationDetailed description of several embodiments

La figure 1 représente, de façon très partielle, une partie de turbomachine, par exemple d'un turboréacteur d'avion, munie d'aubes 2 à angle de calage variable. Ces aubes sont par exemple des aubes directrices en entrée de compresseur de turbomachine, réparties autour de l'axe de la turbomachine. Sur cette figure 1, seule une aube est représentée.The figure 1 represents, in a very partial manner, a part of a turbomachine, for example an airplane turbojet, provided with blades 2 with variable pitch angle. These vanes are, for example, guide vanes at the turbomachine compressor inlet, distributed around the axis of the turbomachine. On this figure 1 only one dawn is represented.

De façon bien connue, la commande des positions angulaires des aubes 2 est réalisée par un anneau de commande 4 entourant un carter 6 de la turbomachine (montré seulement partiellement sur la figure 1) et une pluralité de biellettes 20. Chaque biellette 20 comporte une première extrémité 20a reliée à l'anneau de commande 4 par des moyens de liaison formant articulation. Par exemple, cette articulation est réalisée par un axe ou doigt 8 traversant la première extrémité 20a de la biellette 20 et engagé dans un logement radial 10 de l'anneau de commande 4.In a well known manner, the control of the angular positions of the blades 2 is achieved by a control ring 4 surrounding a casing 6 of the turbomachine (shown only partially on the figure 1 ) and a plurality of rods 20. Each rod 20 has a first end 20a connected to the control ring 4 by connecting means forming articulation. For example, this articulation is performed by an axis or finger 8 passing through the first end 20a of the rod 20 and engaged in a radial housing 10 of the control ring 4.

Une deuxième extrémité 20b de la biellette 20 est montée sur un pivot 30 de l'aube 2 par l'intermédiaire de moyens de fixation 12. Ces moyens de fixation 12 comportent classiquement une vis rapportée 14 et une douille auto-freinante (non représentée) implantée dans le pivot de l'aube. Si la hauteur du pivot de l'aube ne permet pas la pose d'une douille auto-freinante, on peut également prévoir des moyens de fixation sous la forme d'un système vis-écrou (non représenté) comprenant une tige filetée solidaire du pivot de l'aube et sur laquelle est vissé un écrou de serrage axial.A second end 20b of the rod 20 is mounted on a pivot 30 of the blade 2 by means of fastening means 12. These fastening means 12 conventionally comprise an attached screw 14 and a self-locking bushing (not shown) implanted in the pivot of the dawn. If the height of the pivot of the blade does not allow the installation of a self-locking bushing, one can also provide fastening means in the form of a screw-nut system (not shown) comprising a threaded rod secured to the pivot of the blade and on which is screwed an axial clamping nut.

Selon l'invention, des moyens de pincement sont prévus qui agissent transversalement par rapport à un plan longitudinal médian P de la biellette pour bloquer en rotation sans jeu la deuxième extrémité 20b de la biellette 20 sur le pivot de l'aube. Ces moyens de pincement comportent un chapeau de serrage 40 appliqué sur la deuxième extrémité 20b de la biellette 20 et sur le pivot de l'aube par les moyens de fixation 12. L'extrémité 20b de la biellette et le pivot 30 de l'aube sont en appui mutuel transversal par des faces latérales sensiblement parallèles au plan P. Le chapeau 40 présente au moins une face latérale interne inclinée par rapport au plan longitudinal médian P de la biellette qui coopère avec une face inclinée correspondante de la deuxième extrémité 20b de la biellette ou du pivot 30 ou d'un élément de contact interposé entre la partie d'extrémité 20b de la biellette et du pivot 30. Sous l'effet du serrage axial du chapeau 40, les faces inclinées coopèrent entre elles pour produire l'effort de pincement transversal de l'extrémité 20b de la biellette sur le pivot de l'aube.According to the invention, clamping means are provided which act transversely with respect to a median longitudinal plane P of the rod for locking in rotation without play the second end 20b of the rod 20 on the pivot of the blade. These clamping means comprise a clamping cap 40 applied on the second end 20b of the rod 20 and on the pivot of the blade by the fastening means 12. The end 20b of the rod and the pivot 30 of the dawn are transversely mutual support by lateral faces substantially parallel to the plane P. The cap 40 has at least one inner lateral face inclined relative to the median longitudinal plane P of the rod which cooperates with a corresponding inclined face of the second end 20b of the rod or the pivot 30 or a contact element interposed between the end portion 20b of the link and the pivot 30. Under the effect of the axial clamping of the cap 40, the inclined faces cooperate with each other to produce the effort of transverse pinch of the end 20b of the rod on the pivot of the blade.

On décrira ci-après plusieurs modes de réalisation de ces moyens de pincement.Several embodiments of these pinching means will be described below.

Conformément à un premier mode de réalisation de l'invention illustré par les figures 2 et 3, le pivot 30 de l'aube du dispositif de commande comporte une partie latérale rigide 31 faisant saillie longitudinalement à partir d'une face supérieure 32 du pivot 30 au voisinage d'un bord de celle-ci. Cette partie rigide est réalisée en une seule pièce avec le pivot 30, a une face latérale plane interne 31a sensiblement parallèle au plan P et une face latérale externe plane 31b qui est inclinée par rapport au plan P. La face latérale plane interne 31a de la partie rigide peut également être légèrement inclinée par rapport au plan P afin de permettre un meilleur maintien de la biellette 20 sur le pivot 30.According to a first embodiment of the invention illustrated by the Figures 2 and 3 , the pivot 30 of the blade of the control device comprises a rigid lateral portion 31 protruding longitudinally from an upper face 32 of the pivot 30 adjacent an edge thereof. This rigid portion is made in one piece with the pivot 30, has an inner plane lateral face 31a substantially parallel to the plane P and a planar outer side face 31b which is inclined with respect to the plane P. The internal flat lateral face 31a of the rigid part may also be slightly inclined relative to the plane P to allow better maintenance of the rod 20 on the pivot 30.

La deuxième extrémité 20b de la biellette 20 présente un orifice 21 dans lequel s'engage la vis 14 (ou une tige filetée solidaire du pivot de l'aube) avec jeu et s'appuie sur la face 32 du pivot 30. Cette extrémité 20b de la biellette présente une première face latérale 22a qui est sensiblement parallèle au plan médian longitudinal P de la biellette et qui s'appuie sur la face latérale plane interne 31a de la partie rigide 31, et une deuxième face latérale 22b qui est inclinée par rapport au plan P.The second end 20b of the rod 20 has an orifice 21 in which the screw 14 (or a threaded rod secured to the pivot of the blade) engages with play and rests on the face 32 of the pivot 30. This end 20b of the link has a first lateral face 22a which is substantially parallel to the longitudinal median plane P of the rod and which rests on the internal flat lateral face 31a of the rigid portion 31, and a second lateral face 22b which is inclined relative to on the plane P.

Par surface inclinée par rapport au plan longitudinal médian de la biellette P, on entend, pour la suite de la description, que cette surface peut par exemple faire un angle compris entre 15° et 30° avec le plan P.By surface inclined with respect to the median longitudinal plane of the rod P is meant, for the rest of the description, that this surface may for example make an angle of between 15 ° and 30 ° with the plane P.

Le chapeau de serrage 40 comporte une partie sensiblement cylindrique 42 prolongée à sa partie inférieure par une collerette 44. A sa partie supérieure, le chapeau 40 présente un orifice 46 dans lequel s'engage la vis 14 (ou la tige filetée). Un passage transversal 48 est ménagé dans la partie cylindrique 42 du chapeau pour le logement de la deuxième extrémité 20b de la biellette 20 et de la partie rigide 31 du pivot 30. Le passage 48 est bordé de deux faces latérales inclinées 48a, 48b ayant des inclinaisons correspondantes à celles des faces 22b, 31b et s'appuyant sur celles-ci.The clamping cap 40 has a substantially cylindrical portion 42 extended at its lower part by a flange 44. At its upper part, the cap 40 has an orifice 46 in which the screw 14 (or the threaded rod) engages. A transverse passage 48 is formed in the cylindrical portion 42 of the cap for housing the second end 20b of the rod 20 and the rigid portion 31 of the pivot 30. The passage 48 is bordered by two inclined lateral faces 48a, 48b having inclinations corresponding to those of the faces 22b, 31b and based thereon.

La vis 14 est introduite successivement dans l'orifice 46 du chapeau de serrage, dans l'orifice 21 de la deuxième extrémité de la biellette et dans un orifice (non représenté) pratiqué axialement dans le pivot de l'aube. Dans le cas d'un système vis-écrou, la tige filetée solidaire du pivot de l'aube traverse également l'orifice 21 de la deuxième extrémité de la biellette et l'orifice 46 du chapeau de serrage. Sous l'effet du serrage axial et de l'appui résultant sur les faces inclinées 22b, 31b, un pincement transversal est exercé et permet d'appliquer les faces 31a, 22a l'une contre l'autre assurant ainsi une liaison en rotation sans jeu entre la biellette 20 et le pivot 30 de l'aube.The screw 14 is inserted successively into the orifice 46 of the clamping cap, into the orifice 21 of the second end of the rod and into an orifice (not shown) formed axially in the pivot of the blade. In the case of a screw-nut system, the threaded rod secured to the pivot of the blade also passes through the orifice 21 of the second end of the rod and the orifice 46 of the clamping cap. Under the effect of the axial clamping and the resulting support on the inclined faces 22b, 31b, a transverse nip is exerted and makes it possible to apply the faces 31a, 22a against each other thus ensuring a rotation connection without clearance between the rod 20 and the pivot 30 of the dawn.

Dans l'exemple illustré, le chapeau 40 a une forme sensiblement symétrique exerçant un effort de pincement symétrique avec les deux faces latérales inclinées 48a, 48b bordant le passage 48. En variante, seule la face latérale 48a peut être inclinée pour coopérer avec la face 22b de la deuxième extrémité 20b de la biellette, l'autre face 48b étant parallèle au plan P, de même alors que la face 31b.In the example shown, the cap 40 has a substantially symmetrical shape exerting a symmetrical clamping force with the two inclined side faces 48a, 48b bordering the passage 48. As a variant, only the lateral face 48a can be inclined to cooperate with the face 22b of the second end 20b of the link, the other face 48b being parallel to the plane P, as well as the face 31b.

Selon un deuxième mode de réalisation de l'invention représenté sur les figures 4 et 5, le pivot 30 de l'aube du dispositif de commande comporte en outre, par rapport au premier mode de réalisation décrit ci-dessus, une languette latérale flexible 33 faisant saillie longitudinalement à partir de la face supérieure 32 du pivot 30 et disposée sensiblement symétriquement à la partie rigide 31 par rapport au plan longitudinal médian P de la biellette. Cette languette flexible 33 est réalisée en une seule pièce avec le pivot 30 et comporte une face latérale interne 33a sensiblement parallèle au plan P et une face latérale externe 33b inclinée par rapport au plan P.According to a second embodiment of the invention shown on the Figures 4 and 5 , the pivot 30 of the blade of the control device further comprises, with respect to the first embodiment described above, a flexible lateral tab 33 protruding longitudinally from the upper face 32 of the pivot 30 and arranged substantially symmetrically at the rigid portion 31 relative to the median longitudinal plane P of the link. This flexible tongue 33 is made in one piece with the pivot 30 and has an inner side face 33a substantially parallel to the plane P and an outer side face 33b inclined relative to the plane P.

La deuxième extrémité 20b de la biellette 20 s'appuie sur la face supérieure 32 du pivot 30. La première face latérale 22a de l'extrémité 20b de la biellette est parallèle au plan P et s'appuie sur la face latérale interne 31a de la partie rigide 31, et la deuxième face latérale 22b de cette même extrémité 20b est également parallèle au plan P et s'appuie sur la face latérale interne 33a de la languette flexible 33.The second end 20b of the rod 20 is supported on the upper face 32 of the pivot 30. The first lateral face 22a of the end 20b of the rod is parallel to the plane P and bears on the inner lateral face 31a of the rigid part 31, and the second lateral face 22b of this same end 20b is also parallel to the plane P and rests on the internal lateral face 33a of the flexible tongue 33.

La vis 14 est introduite successivement dans l'orifice 46 du chapeau de serrage, dans l'orifice 21 de la deuxième extrémité de la biellette et dans l'orifice pratiqué dans le pivot de l'aube. Dans le cas d'un système vis-écrou, la tige filetée solidaire du pivot de l'aube traverse également l'orifice 21 de la deuxième extrémité de la biellette et l'orifice 46 du chapeau de serrage. Comme dans le mode de réalisation précédent, le chapeau 40 présente un passage transversal 48 ménagé dans la partie cylindrique 42 du chapeau avec deux faces latérales inclinées 48a, 48b qui présentent des inclinaisons correspondantes à celles des faces 33b, 31b et s'appuient sur celles-ci.The screw 14 is introduced successively into the orifice 46 of the clamping cap, into the orifice 21 of the second end of the rod and into the orifice formed in the pivot of the blade. In the case of a screw-nut system, the threaded rod integral with the pivot of the dawn crosses also the orifice 21 of the second end of the rod and the orifice 46 of the clamping cap. As in the previous embodiment, the cap 40 has a transverse passage 48 formed in the cylindrical portion 42 of the cap with two inclined side faces 48a, 48b which have inclinations corresponding to those of the faces 33b, 31b and are based on those -this.

Sous l'effet de serrage axial engendré par la vis 14 (ou par un écrou dans le cas d'une tige filetée) et de l'appui résultant sur les faces inclinées 33b, 31b, un pincement transversal est exercé et permet d'appliquer les faces 31a, 22a et 33a, 22b respectivement l'une contre l'autre. Le chapeau de serrage 40 prend appui sur la partie rigide 31 du pivot de l'aube afin d'exercer un effort de pincement indirect sur la deuxième extrémité 20b de la biellette 20 par la languette flexible 33. Ainsi, tout risque de jeu est éliminé et la biellette 20 est bien bloquée en rotation sur le pivot 30 de l'aube.Under the axial clamping effect generated by the screw 14 (or by a nut in the case of a threaded rod) and the resulting support on the inclined faces 33b, 31b, a transverse nip is exerted and makes it possible to apply the faces 31a, 22a and 33a, 22b respectively against each other. The clamping cap 40 bears on the rigid portion 31 of the pivot of the blade in order to exert an indirect clamping force on the second end 20b of the link 20 by the flexible tongue 33. Thus, any risk of play is eliminated. and the rod 20 is locked in rotation on the pivot 30 of the blade.

Dans l'exemple illustré par les figures 4 et 5, la face latérale externe inclinée 33b de la languette flexible 33 et la face latérale inclinée 48a du passage 48 du chapeau de serrage 40 ont été représentées planes. Bien entendu, on peut aussi imaginer que ces deux faces sont sensiblement coniques. De même, la face latérale externe 31b de la partie rigide 31 et la face latérale inclinée 48b du passage 48 du chapeau de sevrage 40 peuvent également être sensiblement coniques.In the example illustrated by the Figures 4 and 5 , the inclined outer side face 33b of the flexible tongue 33 and the inclined side face 48a of the passage 48 of the clamping cap 40 have been shown planar. Of course, one can also imagine that these two faces are substantially conical. Similarly, the outer side face 31b of the rigid portion 31 and the inclined side face 48b of the passage 48 of the weaning cap 40 may also be substantially conical.

On se réfère maintenant aux figures 6 et 7 qui illustrent un troisième mode de réalisation de l'invention. Dans ce mode de réalisation, le pivot 30 de l'aube du dispositif de commande présente deux fentes 34a, 34b sensiblement parallèles au plan P et formées entre un bloc central 35 du pivot 30 et deux parties latérales amincies 36a, 36b formant languettes flexibles. Ces parties latérales amincies comportent chacune une face latérale externe, respectivement 37a et 37b, inclinée par rapport au plan longitudinal médian P de la biellette.We now refer to Figures 6 and 7 which illustrate a third embodiment of the invention. In this embodiment, the pivot 30 of the blade of the control device has two slots 34a, 34b substantially parallel to the plane P and formed between a central block 35 of the pivot 30 and two thinned side portions 36a, 36b forming flexible tongues. These thinned lateral portions each comprise an external lateral face, respectively 37a and 37b, inclined with respect to the median longitudinal plane P of the rod.

La deuxième extrémité 20b de la biellette 20 s'appuie sur la face supérieure 32 du bloc central 35 du pivot 30. Cette extrémité 20b présente une forme à section en U avec deux ailes 24a et 24b engagées respectivement dans les fentes 34a, 34b du pivot 30 de l'aube.The second end 20b of the rod 20 is supported on the upper face 32 of the central block 35 of the pivot 30. This end 20b has a U-shaped section with two wings 24a and 24b respectively engaged in the slots 34a, 34b of the pivot 30 of dawn.

La vis 14 est introduite successivement dans l'orifice 46 du chapeau de serrage, dans l'orifice 21 de la deuxième extrémité de la biellette et dans l'orifice pratiqué dans le pivot de l'aube. Dans le cas d'un système vis-écrou, la tige filetée solidaire du pivot de l'aube traverse également l'orifice 21 de la deuxième extrémité de la biellette et l'orifice 46 du chapeau de serrage. Les deux faces latérales inclinées 48a, 48b du passage 48 ménagé dans sa partie cylindrique 42 présentent des inclinaisons correspondantes à celles des faces latérales externes inclinées 37a, 37b des languettes flexibles 36a, 36b et s'appuient sur celles-ci.The screw 14 is introduced successively into the orifice 46 of the clamping cap, into the orifice 21 of the second end of the rod and in the hole made in the pivot of the dawn. In the case of a screw-nut system, the threaded rod secured to the pivot of the blade also passes through the orifice 21 of the second end of the rod and the orifice 46 of the clamping cap. The two inclined lateral faces 48a, 48b of the passage 48 formed in its cylindrical portion 42 have inclinations corresponding to those of the inclined outer lateral faces 37a, 37b of the flexible tongues 36a, 36b and rest thereon.

Sous l'effet de serrage engendré par la vis 14 (ou par un écrou dans le cas d'une tige filetée), les faces latérales inclinées 48a, 48b du chapeau 40 exercent un appui sur les faces latérales inclinées 37a, 37b des languettes flexibles afin d'obtenir un effort de pincement transversal des ailes 24a, 24b de la deuxième extrémité 20b de la biellette dans les fentes 34a, 34b du pivot de l'aube. On utilise ainsi la souplesse des languettes flexibles 36a, 36b pour venir exercer par le chapeau de serrage un effort de pincement indirect sur la deuxième extrémité 20b de la biellette 20. Les faces latérales inclinées 37a, 37b des languettes flexibles permettent de transmettre cet effort de serrage engendré par les moyens de fixation 12 de façon symétrique par rapport au plan P. La biellette 20 est donc bloquée en rotation sans jeu sur le pivot 30 de l'aube.Under the clamping effect generated by the screw 14 (or by a nut in the case of a threaded rod), the inclined lateral faces 48a, 48b of the cap 40 exert a bearing on the inclined lateral faces 37a, 37b of the flexible tongues. to obtain a transverse clamping force of the wings 24a, 24b of the second end 20b of the rod in the slots 34a, 34b of the pivot of the blade. The flexibility of the flexible tongues 36a, 36b is thus used to exert by the clamping cap an indirect clamping force on the second end 20b of the rod 20. The inclined lateral faces 37a, 37b of the flexible tongues make it possible to transmit this effort of clamping generated by the fastening means 12 symmetrically with respect to the plane P. The rod 20 is locked in rotation without play on the pivot 30 of the blade.

Selon un quatrième mode de réalisation de l'invention représenté sur les figures 8, 9a et 9b, le pivot 30 de l'aube du dispositif de commande présente un bloc 35 avec deux faces latérales planes 38a, 38b sensiblement parallèles au plan P et symétriques par rapport à ce même plan P.According to a fourth embodiment of the invention shown in Figures 8, 9a and 9b , the pivot 30 of the blade of the control device has a block 35 with two flat lateral faces 38a, 38b substantially parallel to the plane P and symmetrical with respect to this same plane P.

La deuxième extrémité 20b de la biellette 20 s'appuie sur la face supérieure 32 du bloc 35. Cette extrémité 20b présente une forme à section en U avec deux ailes 24a, 24b qui s'appuient sur les faces latérales planes correspondantes 38a, 38b du pivot 30 de l'aube.The second end 20b of the rod 20 bears on the upper face 32 of the block 35. This end 20b has a U-shaped section with two wings 24a, 24b which rest on the corresponding flat lateral faces 38a, 38b of the pivot 30 of the dawn.

Des cales 50a, 50b sont interposées entre les faces latérales inclinées 48a, 48b du passage transversal 48 ménagé dans la partie cylindrique 42 du chapeau de serrage 40 et les ailes 24a, 24b de la deuxième extrémité 20b de la biellette. Ces cales 50a, 50b comportent, dans leur partie supérieure, des premières faces latérales externes 51a, 51b inclinées par rapport au plan P.Wedges 50a, 50b are interposed between the inclined lateral faces 48a, 48b of the transverse passage 48 formed in the cylindrical portion 42 of the clamping cap 40 and the wings 24a, 24b of the second end 20b of the link. These shims 50a, 50b comprise, in their upper part, first external lateral faces 51a, 51b inclined with respect to the plane P.

La vis 14 est introduite successivement dans l'orifice 46 du chapeau de serrage, dans l'orifice 21 de la deuxième extrémité de la biellette et dans l'orifice pratiqué dans le pivot de l'aube. Dans le cas d'un système vis-écrou, la tige filetée solidaire du pivot de l'aube traverse également l'orifice 21 de la deuxième extrémité de la biellette et l'orifice 46 du chapeau de serrage. Les deux faces latérales inclinées 48a, 48b du passage 48 ménagé dans sa partie cylindrique 42 présentent des inclinaisons correspondantes à celles des premières faces latérales externes inclinées 51a, 51b des cales 50a, 50b et s'appuient sur celles-ci.The screw 14 is introduced successively into the orifice 46 of the clamping cap, into the orifice 21 of the second end of the rod and in the hole made in the pivot of the dawn. In the case of a screw-nut system, the threaded rod secured to the pivot of the blade also passes through the orifice 21 of the second end of the rod and the orifice 46 of the clamping cap. The two inclined side faces 48a, 48b of the passage 48 formed in its cylindrical portion 42 have inclinations corresponding to those of the first inclined outer lateral faces 51a, 51b of the wedges 50a, 50b and bear thereon.

Sous l'effet du serrage axial engendré par la vis 14 (ou par un écrou dans le cas d'une tige filetée), un effort de pincement transversal des ailes 24a, 24b de la deuxième extrémité 20b de la biellette sur les faces latérales planes 38a, 38b du pivot 30 est exercé par appui des faces latérales inclinées 48a, 48b du chapeau 40 sur les cales 50a, 50b. Le chapeau de serrage 40 vient ainsi exercer un effort de pincement indirect sur la deuxième extrémité 20b de la biellette 20 en prenant appui sur les premières faces latérales externes 51a, 51b des cales. La biellette 20 est donc bloquée en rotation sans jeu sur le pivot 30 de l'aube.Under the effect of the axial clamping generated by the screw 14 (or by a nut in the case of a threaded rod), a transverse clamping force of the flanges 24a, 24b of the second end 20b of the link on the flat lateral faces 38a, 38b of the pivot 30 is exerted by supporting the inclined side faces 48a, 48b of the cap 40 on the wedges 50a, 50b. The clamping cap 40 thus exerts an indirect clamping force on the second end 20b of the link 20 by bearing on the first outer lateral faces 51a, 51b of the wedges. The rod 20 is locked in rotation without play on the pivot 30 of the blade.

Comme représenté sur la figure 9a, les cales 50a, 50b présentent avantageusement, dans leur partie inférieure, des secondes faces latérales externes 52a, 52b s'appuyant sur des faces correspondantes du pivot 30 de l'aube. Ces secondes faces latérales externes 52a, 52b sont de préférence inclinées par rapport au plan P et présentent des inclinaisons d'angles opposées à celles des premières faces latérales externes inclinées 51a, 51b, par exemple symétriques de celles-ci par rapport à un plan transversal médian des cales 50a, 50b. Les faces latérales inclinées 52a, 52b s'appuient sur des faces inclinées correspondantes formées dans des gorges 39a, 39b qui bordent le bloc central 35 du pivot. De la sorte, on assure un maintien des cales 50a, 50b grâce auquel l'effort de pincement du chapeau de serrage s'exerce dans une direction sensiblement normale aux faces latérales planes 38a, 38b du pivot de l'aube et à une hauteur qui dépend de la conception des cales 50a, 50b (valeur d'angle de leurs faces inclinées, choix de leur positionnement dans l'assemblage.....).As shown on the figure 9a , the shims 50a, 50b advantageously have, in their lower part, second outer lateral faces 52a, 52b supported on corresponding faces of the pivot 30 of the blade. These second outer lateral faces 52a, 52b are preferably inclined relative to the plane P and have inclinations of opposite angles to those of the first inclined external lateral faces 51a, 51b, for example symmetrical thereof with respect to a transverse plane median of the holds 50a, 50b. The inclined side faces 52a, 52b bear on corresponding inclined faces formed in grooves 39a, 39b which border the central block 35 of the pivot. In this way, the shims 50a, 50b are maintained by means of which the gripping force of the clamping cap is exerted in a direction substantially normal to the flat lateral faces 38a, 38b of the pivot of the blade and at a height which depends on the design of shims 50a, 50b (angle value of their inclined faces, choice of their positioning in the assembly .....).

Selon une variante de ce quatrième mode de réalisation illustré par la figure 9b, la première face latérale externe 51a, 51b de chacune des deux cales 50a, 50b est à section sensiblement curviligne. En outre, les ailes 24a, 24b sont repliées à leurs extrémités pour former des rebords 25a, 25b logés dans des gorges 39'a, 39'b qui bordent le bloc central 35 du pivot. Cette disposition contribue à favoriser l'immobilisation sans jeu de la biellette 20 sur le pivot 30.According to a variant of this fourth embodiment illustrated by the figure 9b the first outer lateral face 51a, 51b of each of the two wedges 50a, 50b is of substantially curvilinear section. In addition, the wings 24a, 24b are folded at their ends to form flanges 25a, 25b housed in grooves 39'a, 39'b which border the central block 35 of the pivot. This arrangement contributes to the immobilization without play of the rod 20 on the pivot 30.

Conformément à un cinquième mode de réalisation de l'invention représenté par les figures 10 et 11, le pivot 30 de l'aube du dispositif de commande présente également un bloc central 35 avec deux faces latérales planes 38a, 38b sensiblement parallèles au plan P et symétriques par rapport à ce même plan P.According to a fifth embodiment of the invention represented by the Figures 10 and 11 the pivot 30 of the blade of the control device also has a central block 35 with two flat lateral faces 38a, 38b substantially parallel to the plane P and symmetrical with respect to the same plane P.

La deuxième extrémité 20b de la biellette 20 s'appuie sur la face supérieure 32 du bloc 35 du pivot 30. Cette extrémité 20b possède une forme à section en U avec deux ailes 24a, 24b qui s'appuient sur les faces latérales planes 38a, 38b. Des nervures 26a, 26b sont formées en une seule pièce avec les ailes 24a, 24b, sur les faces extérieures de celles-ci. Ces nervures 26a, 26b présentent des faces latérales externes 27a, 27b inclinées par rapport au plan P.The second end 20b of the rod 20 is supported on the upper face 32 of the block 35 of the pivot 30. This end 20b has a U-shaped section with two wings 24a, 24b which rest on the flat lateral faces 38a, 38b. Ribs 26a, 26b are integrally formed with wings 24a, 24b on the outer faces thereof. These ribs 26a, 26b have external lateral faces 27a, 27b inclined relative to the plane P.

La vis 14 est introduite successivement dans l'orifice 46 du chapeau de serrage, dans l'orifice 21 de la deuxième extrémité de la biellette et dans l'orifice pratiqué dans le pivot de l'aube. Dans le cas d'un système vis-écrou, la tige filetée solidaire du pivot de l'aube traverse également l'orifice 21 de la deuxième extrémité de la biellette et l'orifice 46 du chapeau de serrage. Les faces latérales inclinées 48a, 48b du passage 48 ménagé dans le chapeau 40 ont des inclinaisons correspondantes à celles des faces latérales externes 27a, 27b des nervures 26a, 26b.The screw 14 is introduced successively into the orifice 46 of the clamping cap, into the orifice 21 of the second end of the rod and into the orifice formed in the pivot of the blade. In the case of a screw-nut system, the threaded rod secured to the pivot of the blade also passes through the orifice 21 of the second end of the rod and the orifice 46 of the clamping cap. The inclined side faces 48a, 48b of the passage 48 formed in the cap 40 have inclinations corresponding to those of the outer lateral faces 27a, 27b of the ribs 26a, 26b.

Sous l'effet de serrage axial engendré par la vis 14 (ou par un écrou dans le cas d'une tige filetée), un effort de pincement transversal des ailes 24a, 24b de la deuxième extrémité 20b de la biellette est exercé sur les faces latérales planes 38a, 38b du pivot 30 par appui des faces latérales inclinées 48a, 48b du chapeau de serrage 40 sur les faces latérales 27a, 27b des nervures 26a, 26b. Le chapeau de serrage 40 vient ainsi exercer un effort de pincement direct sur la deuxième extrémité 20b de la biellette 20 en prenant appui sur les faces latérales externes des nervures 26a, 26b. La deuxième extrémité 20b de la biellette 20 est donc bloquée en rotation sans jeu sur le pivot 30 de l'aube.Under the axial clamping effect generated by the screw 14 (or by a nut in the case of a threaded rod), a transverse clamping force of the wings 24a, 24b of the second end 20b of the link is exerted on the faces. lateral planar 38a, 38b of the pivot 30 by supporting the inclined side faces 48a, 48b of the clamping cap 40 on the side faces 27a, 27b of the ribs 26a, 26b. The clamping cap 40 thus exerts a direct clamping force on the second end 20b of the rod 20 by bearing on the outer lateral faces of the ribs 26a, 26b. The second end 20b of the rod 20 is locked in rotation without play on the pivot 30 of the blade.

Sur les figures 1 à 11, le chapeau de serrage 40 présente une partie sensiblement cylindrique 42. En variante, cette partie cylindrique peut par exemple être remplacée par une partie sensiblement rectangulaire, les moyens de pincement agissant dans ce cas de manière identique.On the Figures 1 to 11 , the clamping cap 40 has a substantially cylindrical portion 42. Alternatively, this cylindrical portion can for example be replaced by a substantially rectangular portion, the clamping means acting in this case identically.

On décrira maintenant certaines autres caractéristiques communes aux cinq modes de réalisation du dispositif de commande selon l'invention.Some other features common to the five embodiments of the control device according to the invention will now be described.

Comme l'illustre la figure 1, le dispositif de commande peut comporter une douille 60 disposée autour du pivot 30 de l'aube, entre le chapeau de serrage 40 et le rebord 62 d'une ouverture du carter 6 de la turbomachine dans laquelle est monté le pivot 30 de l'aube 2. Cette douille 60 est destinée à permettre un centrage du pivot de l'aube dans l'ouverture du carter. Dans ce cas, le chapeau de serrage 40 s'appuie également à sa périphérie sur la douille 60. Une cale 64 de réglage du jeu interposée entre le chapeau de serrage 40 et la douille 60 peut alors avantageusement être prévue afin de tenir compte d'un éventuel jeu axial entre ces pièces. De plus, une rondelle anti-friction 66 peut être disposée entre le rebord 62 de l'ouverture du carter 6 et la base du pivot 30 de l'aube.As illustrated by figure 1 , the control device may comprise a bushing 60 disposed around the pivot 30 of the blade, between the clamping cap 40 and the flange 62 of an opening of the casing 6 of the turbomachine in which the pivot 30 of the turbine engine 30 is mounted. 2. This bushing 60 is intended to allow a centering of the pivot of the blade in the opening of the housing. In this case, the clamping cap 40 also bears at its periphery on the bushing 60. A shim 64 for adjusting the clearance interposed between the clamping cap 40 and the bushing 60 can then advantageously be provided in order to take account of the a possible axial play between these parts. In addition, an anti-friction washer 66 may be disposed between the flange 62 of the opening of the housing 6 and the base of the pivot 30 of the blade.

Il est en outre connu qu'en cas d'efforts aérodynamiques importants sur les aubes à angle de calage variable, la longueur de la biellette de commande peut être supérieure aux standards usuels. Il convient alors de prévoir un réglage du jeu axial (par exemple de l'ordre de 0,10 mm) entre la surface supérieure de la deuxième extrémité 20b de la biellette 20 sur laquelle s'applique le chapeau de serrage 40 et celui-ci. Pour les deuxième, troisième et quatrième modes de réalisation de l'invention décrits ci-dessus, ce réglage peut être obtenu en interposant entre ces deux éléments une pièce complémentaire (non représentée sur les figures) jouant le rôle d'entretoise, éventuellement à effet ressort. Cette entretoise peut par exemple être réalisée par une pièce circulaire. La présence d'une telle entretoise n'est toutefois pas nécessaire pour les dispositifs de commande décrits dans les premier et cinquième mode de réalisation de l'invention.It is furthermore known that, in the case of large aerodynamic forces on the blades with variable pitch angle, the length of the control rod may be greater than the usual standards. It is then necessary to provide an adjustment of the axial clearance (for example of the order of 0.10 mm) between the upper surface of the second end 20b of the link 20 on which the clamping cap 40 is applied and the latter . For the second, third and fourth embodiments of the invention described above, this adjustment can be obtained by interposing between these two elements a complementary piece (not shown in the figures) acting as a spacer, possibly with effect. spring. This spacer can for example be made by a circular part. The presence of such a spacer is however not necessary for the control devices described in the first and fifth embodiments of the invention.

Enfin, selon une caractéristique avantageuse de l'invention, il peut exister une asymétrie de position des faces latérales 22a, 22b ou ailes 24a, 24b de la biellette 20 par rapport à son plan médian P afin d'assurer un détrompage entre un bord d'attaque et un bord de fuite de la biellette. Par asymétrie de position, illustrée par exemple par les figures 3 et 5, on entend que la distance D1 entre l'une des faces latérales 22a, 22b (ou ailes 24a, 24b) de la biellette 20 et le plan médian P est supérieure ou inférieure à la distance D2 entre l'autre face latérale 22a, 22b (ou aile 24a, 24b) et le plan médian P.Finally, according to an advantageous characteristic of the invention, there may be a position asymmetry of the lateral faces 22a, 22b or wings 24a, 24b of the rod 20 with respect to its median plane P in order to provide a foolproofing between an edge. attack and a trailing edge of the link. By asymmetry of position, illustrated for example by figures 3 and 5 it is meant that the distance D1 between one of the lateral faces 22a, 22b (or wings 24a, 24b) of the rod 20 and the median plane P is greater or smaller than the distance D2 between the other lateral face 22a, 22b (or wing 24a, 24b) and the median plane P.

Claims (18)

  1. A device for controlling a variable-angle vane for a stator of a turbomachine compressor, the device comprising a link (20), connection means (8, 10) forming a hinge between a first end (20a) of the link and a control ring (4), fixing means (12) for fixing a second end (20b) of the link on a pivot (30) of a vane (2) to be controlled, and pinch means (40) acting transversely relative to a longitudinal midplane (P) of the link to lock the second end of the link in rotation without slack on the pivot (30), the pinch means comprising a clamping cap (40) applied against the second end (20b) of the link (20) and subjected to an axial clamping force under the effect of fixing means (12), said clamping cap presenting a radial passage (48) having at least one inside lateral face (48a, 48b) which is inclined relative to a longitudinal midplane (P) of said passage (48) and which is for co-operating with a corresponding inclined lateral face of said second end of the link, the device being characterised in that the clamping cap (40) exerts a transverse pinching force on the corresponding face of the second end (20b) of the link (20) via contact elements (31, 33, 36a, 36b, 50a, 50b) interposed in the radial passage (48) between the clamping cap and the second end of the link.
  2. A device according to claim 1, characterised in that the radial passage (48) of the clamping cap (40) presents two inclined inside lateral faces (48a, 48b) that are symmetrical about the longitudinal midplane (P) of the passage.
  3. A device according to claim 1, characterised in that the pivot presents a rigid portion (31) which projects longitudinally from a top face (32) of the pivot on one side thereof, and which has an inside lateral face (31a) against which a first lateral face (22a) of the second end (20b) of the link (20) bears.
  4. A device according to claim 3, characterised in that an inclined face (48a) of the clamping cap (40) bears against a second inclined lateral face (22b) of the second end (20b) of the link (20) opposite the face (22a) against which the inside lateral face (31a) of the rigid portion (31) bears.
  5. A device according to claim 3, characterised in that the pivot further presents a flexible tongue (33) projecting longitudinally from the top face (32) of the pivot (30) on a side opposite from the side from which the rigid portion (31) projects, the flexible tongue having an inside lateral face (33a) which bears against the second lateral face (22b) of the second end (20b) of the link (20) opposite from the face (22a) against which the inside lateral face (31a) of the rigid portion (31) bears, and an inclined outside lateral face (33b) against which an inclined lateral face (48a) of the clamping cap (40) bears.
  6. A device according to claim 5, characterised in that the inclined outside lateral face (33b) of the flexible tongue (33) and the inclined lateral face (48a) of the clamping cap (40) are plane.
  7. A device according to claim 5, characterised in that the inclined outside lateral face (33b) of the flexible tongue (33) and the inclined lateral face (48a) of the clamping cap (40) are substantially conical.
  8. A device according to any one of claims 4 to 7, characterised in that the lateral faces (22a, 22b) of the second end (20b) of the link (20) present positions that are asymmetrical about the midplane (P).
  9. A device according to claim 1, characterised in that:
    .the vane pivot (30) presents two slots (34a, 34b) formed between a central block (35) of the pivot, and two thin lateral portions (36a, 36b) forming flexible tongues having outside lateral faces (37a, 37b) that are inclined relative to the longitudinal midplane (P) of the link;
    .the second end (20b) of the link (20) is of channel section with two flanges (24a, 24b) engaged in the slots (34a, 34b) of the pivot; and
    . the inclined lateral faces (48a, 48b) of the clamping cap bear against the inclined lateral faces (37a, 37b) of the flexible tongues (36a, 36b) under the effect of the fixing means (12) so as to generate a transverse pinching force on the flanges (24a, 24b) of the second end of the link in the slots (34a, 34b) of the vane pivot.
  10. A device according to claim 1, characterised in that:
    . the second end (20b) of the link (20) is of channel section with two flanges (24a, 24b) bearing against plane lateral faces (38a, 38b) of a central block (35) of the vane pivot;
    .pieces of shim (50a, 50b) are interposed between the inclined lateral faces (48a, 48b) of the clamping cap and the flanges (24a, 24b) of the second end of the link; and
    . the inclined lateral faces (48a, 48b) of the clamping cap bear against first outside lateral faces (51a, 51b) of corresponding inclination of the pieces of shim (50a, 50b) under the effect of the fixing means (12) to generate a transverse pinching force on the flanges of the second end of the link against the plane lateral faces (38a, 38b) of the vane pivot.
  11. A device according to claim 10, characterised in that the pieces of shim (50a, 50b) have second inclined outside lateral faces (52a, 52b) of inclinations opposite the inclinations of their first outside lateral faces (51a, 51b) and bearing against corresponding faces of the vane pivot.
  12. A device according to claim 10, characterised in that the outside lateral face (51a, 51b) of each of the two pieces of shim (50a, 50b) is of substantially curvilinear section.
  13. A device according to any one of claims 9 to 12, characterised in that the flanges (24a, 24b) of the second end (20b) of the link (20) present positions that are asymmetrical about the midplane (P).
  14. A device according to claim 1, characterised in that:
    .the second end (20b) of the link (20) is of channel section with two flanges (24a, 24b) bearing against plane lateral faces (38a, 38b) of a central block (35) of the vane pivot (30);
    .both flanges (24a, 24b) of the second end of the link present respective external splines (26a, 26b); and
    .the inclined lateral faces (48a, 48b) of the clamping cap bear against outside lateral faces (27a, 27b) of corresponding inclination of the splines (26a, 26b) under the effect of fixing means (12) to generate a transverse pinching force on the flanges (24a, 24b) of the second end of the link against the plane lateral faces (38a, 38b) of the vane pivot.
  15. A device according to any one of claims 1 to 14, characterised in that the fixing means (12) comprise a screw (14) passing through a first orifice (21) formed in the second end (20b) of the link (20), a second orifice (46) formed in the clamping cap (40), and into a third orifice formed in the vane pivot (30).
  16. A device according to any one of claims 1 to 14, characterised in that the fixing means (12) comprise a threaded rod secured to the vane pivot (30), passing through a first orifice (21) formed in the second end (20b) of the link and through a second orifice (46) formed in the clamping cap (40), and having a clamping nut tightened thereon.
  17. A stator of a turbomachine comprising at least one device for controlling a variable-angle vane according to any one of claims 1 to 16.
  18. A turbomachine comprising at least one device for controlling a variable-angle vane according to any one of claims 1 to 16.
EP03290059A 2002-01-29 2003-01-10 Stator blade control apparatus Expired - Lifetime EP1331403B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0201023 2002-01-29
FR0201023A FR2835295B1 (en) 2002-01-29 2002-01-29 VANE VARIABLE SETTING ANGLE CONTROL DEVICE WITH PINCH CONNECTION FOR TURBOMACHINE COMPRESSOR RECTIFIER

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EP1331403A1 EP1331403A1 (en) 2003-07-30
EP1331403B1 true EP1331403B1 (en) 2008-03-12

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EP03290059A Expired - Lifetime EP1331403B1 (en) 2002-01-29 2003-01-10 Stator blade control apparatus

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US6802692B2 (en) 2004-10-12
CA2418230C (en) 2011-05-17
JP4050626B2 (en) 2008-02-20
ES2304494T3 (en) 2008-10-16
JP2003227495A (en) 2003-08-15
EP1331403A1 (en) 2003-07-30
DE60319612D1 (en) 2008-04-24
FR2835295A1 (en) 2003-08-01
DE60319612T2 (en) 2009-04-02
FR2835295B1 (en) 2004-04-16
CA2418230A1 (en) 2003-07-29
RU2304234C2 (en) 2007-08-10
UA79581C2 (en) 2007-07-10
US20030143067A1 (en) 2003-07-31

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