EP3291367B1 - System zur montage von zwei teilen in eine bewegungsübertragungsvorrichtung - Google Patents

System zur montage von zwei teilen in eine bewegungsübertragungsvorrichtung Download PDF

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Publication number
EP3291367B1
EP3291367B1 EP17184945.8A EP17184945A EP3291367B1 EP 3291367 B1 EP3291367 B1 EP 3291367B1 EP 17184945 A EP17184945 A EP 17184945A EP 3291367 B1 EP3291367 B1 EP 3291367B1
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EP
European Patent Office
Prior art keywords
flange
support
washer
orifices
studs
Prior art date
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Application number
EP17184945.8A
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English (en)
French (fr)
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EP3291367A1 (de
Inventor
Benoît Vion
Christophe Laffont
Maxime LADEVEZ
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.)
Thales SA
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Thales SA
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/125—Means for positioning
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
    • H01Q3/04—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying one co-ordinate of the orientation
    • H01Q3/06—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying one co-ordinate of the orientation over a restricted angle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole
    • H01Q3/08—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying two co-ordinates of the orientation

Definitions

  • the invention relates, for example, to the mounting of a gear associated with a motor supporting a drive shaft for positioning a satellite antenna, in order to reduce the backlash of the gear under expansion or, more generally, more to a differential thermal variation.
  • antenna positioners for connection establishment and communication with a satellite. These positioners are either fixed to the ground or mobile when placed on a moving carrier.
  • the azimuth / elevation positioners usually used comprise two axes of rotation, one of which makes it possible to vary the azimuth of the satellite dish, that is to say the horizontal angle between the direction of the antenna and a direction the reference generally corresponds to the geographic north, and the other to vary the elevation of the antenna and the reference direction.
  • Such positioners have the disadvantage of presenting a singular point vertically, ie, at the zenith.
  • the notion of singular point is known to those skilled in the art and designates a point where the communication between the satellite and the antenna is difficult, if not impossible, because of the dynamic constraints of the positioning of the antenna in the direction of the singular point .
  • the patent EP 2448063 the applicant offers a positioner devoid of singular point located vertically, and balanced without adding counterweight on the positioner, or possibly with very low counterweight.
  • the balancing problems of dish antenna positioners are notably solved by the choice of the value of center distance.
  • the patent US5090823 discloses a motion transmission device comprising two parts made of the same material mounted on a support consisting of a second material.
  • the known kinematics of the prior art is based on technologies using stainless steels, curved recirculating guides of balls, a precision gear.
  • the use of stainless steel is a disadvantage in providing a positioner with a low weight.
  • Some known solutions of the prior art combine steel with aluminum. This however raises problems of differential thermal expansion and galvanic coupling.
  • the use of steel with aluminum can induce faults on the two-axis positioner. Overturning of curved guides as a function of temperature can occur. This ovality causes an increase in the rolling resistance which affects the servo performance. Ovalization can also impact reliability in the long run.
  • the use of steel with aluminum also generates a variation in the play of the gear as a function of temperature.
  • the document US2014083222 discloses a gear assembly that utilizes two materials having different thermal expansion coefficients to realize, a piece of the gear in a first material, and the heart of the gear in a second material that has a coefficient of thermal expansion corresponding to the other components of the device.
  • the devices may comprise a circular part cooperating with a flat part.
  • the driving device is a motor
  • the first part is, for example, a pinion coupled to a motor mounted on the support via the flange.
  • the second part is a ring gear mounted on the support, via a guide ring and pads which provide a degree of freedom in rotation, said ring gear cooperating with the pinion.
  • the support comprises four threaded studs receiving fixing means.
  • the flange comprises two orifices arranged along a first horizontal line H 1 and two orifices arranged along a horizontal line H 2 in the lower part. The shape of the orifices is chosen to allow a slight clearance allowing the material of the flange to expand in the vertical direction.
  • the two orifices, arranged on the low line are placed in position on the two lower pads of the support and fixed by fixing means.
  • the means of against support are, for example, needle screws.
  • the flange is made of thermostable plastic material, the material being chosen to avoid physico-chemical degradation phenomena.
  • the flange is formed of thermostatic material.
  • the material of the support is, for example aluminum, the pinion and the crown are made of stainless steel.
  • the ring is configured to support, for example, a satellite communication antenna.
  • the figure 1 represents an example of a positioner 1 equipped with a mobile assembly 2 with two degrees of freedom comprising a parabolic antenna 3 and a radio frequency amplifier 4 mounted on the back of the parabolic antenna 3.
  • the positioner 1 allows the parabolic dish to be pointed towards a satellite 5.
  • the positioner comprises a base 10 which itself comprises a plate 12 which is mechanically interfaced with two supports 13 on which are fixed recirculation pads. balls 14.
  • a support cradle 20 comprises a guide ring 21 which cooperates with the ball recirculation pads 14 so as to obtain its rotation along a first axis of rotation X.
  • the curved guidance technology with ball recirculating pads is chosen for reasons of rigidity and precision of movement. Without departing from the scope of the invention, one could use a technology with roller skates or any other technology known to those skilled in the art, based on the use of steel.
  • the satellite dish 3 and the radio frequency amplifier 4 constitute a mass that is mobile in rotation with respect to the cradle 20.
  • the cradle comprises a rotation shaft 22 of axis Y ( figure 2 ) which receives the satellite dish.
  • the cradle also includes actuating and measuring means 23 known to those skilled in the art.
  • the rotation shaft 22 and the actuating means allow the rotational drive of the parabolic antenna relative to the cradle about the horizontal axis Y.
  • the Y axis extends orthogonally to the first axis of horizontal rotation X , being carried by the cradle 20.
  • the satellite dish extends above the Y axis.
  • the device comprises, for example, an absolute multi-turn encoder placed on the axis of rotation of the electric motor according to a principle known to those skilled in the art and which will not be detailed. for reasons of simplification.
  • the positioner 1 also comprises an electric motor 26 mounted on the support 13 ( figure 2 ) and coupled to a pinion 27 to allow rotation of the pinion.
  • the electric motor 26 and the pinion 27 are fixed on the supports 13 between the two balls recirculating pads 14.
  • a ring gear 29 cooperates with the pinion 27 so that, when the electric motor 26 makes it possible to rotate the pinion 27 it causes rotation of the ring gear 29 and thus the rotation of the guide ring 21 around the first axis of rotation X.
  • the ring gear 29 is mounted on the support 13 via the guide ring 21 and pads 14 which provide a degree of freedom in rotation. The principle of rotation of such a crown is well known to those skilled in the art and will not be detailed.
  • the object of the invention is in particular at the mounting of the axis of the pinion 27 associated with the drive motor 26 of the ring gear 29 which makes it possible in particular to compensate for the differential expansions of the materials constituting the ring gear, and possibly those of the pinion, in particular by the addition of a third part having differential expansion or thermal variation properties different from those materials from the other two parts and by specific positioning.
  • the thermal variation can lead to an expansion effect or, on the contrary, a "shrinking" effect of the material.
  • the figure 3 illustrates the problem of the backlash that may exist between the teeth 29i of the ring gear 29 and the teeth 27j of the pinion 27 of the motor shaft.
  • This game of beat j b varies according to the deformations materials resulting from differences in the expansion coefficients of the parts supporting the pinion and the ring gear 29 cooperating with the latter.
  • R, K 3 and d are possible adjustment variables.
  • the distance d is a parameter that depends in particular on the size of the final device. For example, for the choice of the parameters, one will take d in an interval [d min , d max ] defined by the constraints of bulk of the engine, for example, according to principles known to those skilled in the art.
  • the value of the differential thermal expansion coefficient K 3 for the material of the flange is for example fixed and depends in particular on the differential thermal expansion coefficients of aluminum and stainless steel in this example, more generally thermal expansion coefficients of the parts of the gear and the support.
  • the value of the coefficient of K 3 is chosen to be greater than the values of K 1 and K 2 or much lower when the fixing devices positioned on the lines H 1 and H 2 are reversed.
  • the value of R is a parameter known initially, it is a measured data.
  • the values of the primitive rays Rc and Rp are fixed for example by the choice of the motorization of the system.
  • the rays The primitives of the crown and the motor pinion will be defined in relation to the size of the engine and the desired torque and rotational speed characteristics.
  • the size of the motor is for example chosen for a given application, while respecting compactness constraints.
  • the axis of the pinion being positioned, the motor will be arranged closer to the pads, for example.
  • the material of the flange, and therefore the value of K 3 are chosen according to the environment in which the device is positioned, for example, taking into account physicochemical conditions, mechanical strength conditions, thermal environment, etc.
  • d obtained makes it possible to position the flange 30.
  • the following steps will consist in particular of maintaining the flange 30 in place, flat and supported on a plane tangent to the four studs of the support 13 of the crown, as will be detailed below.
  • the axis 27 A of the pinion 27 is connected to the motor 26 which is itself fixed by a flange 30 made of heat-stable material, for example a material
  • the flange 30 is mounted to allow fine adjustment of the gear, compensation for differential expansions, and compensation for misalignment to provide a linear contact between the teeth 29i. 27j of the gear.
  • the flange 30 will be placed in abutment on a plane tangent to the four studs of the support.
  • the support 13 on which the pinion 27 and the flange 30 are mounted comprises, for example, four studs 41, 42, 43, 44 each comprising a threaded hole and receiving fastening screws 45.
  • the studs have a height h p greater than thickness e b of the flange.
  • the mounting of the flange 30 on the support is made by interposing a wedge 46 of thermostatic material between the support 13 and a washer 47 having a spring function known in the art under the expression "spring washer”.
  • the spacer 46 thus provides galvanic isolation between the spring washer 47 made of stainless steel and the support 13 made of aluminum.
  • the flange 30 comprises, for example two orifices 301, 302 disposed along a first horizontal line H 1 and two orifices 303, 304 arranged along a second horizontal line H 2 or fixed line in this example.
  • the shape of the orifices 301, 302, 303, 304, is preferably oblong so as to allow a slight deflection in the vertical direction during assembly of the elements. This degree of freedom makes it possible to adjust the play of the gear during the mounting phase in an assumed ambient temperature of 20 ° C. Previously, this involves measuring the circularity defects of the teeth (pinion and ring gear) in order to identify the teeth to put in vis-à-vis during the adjustment phase. This type of adjustment is known to those skilled in the art.
  • the flange 30 is held in abutment on four large washers 49, each of these washers being supported on the studs 41, 42, 43, 44, by means of the screws 45 to be screwed into the holes tapped studs, the height of the studs being greater than the thickness of the flange and the dimensions of the washers greater than those of the orifices, it results in a positioning of the flange between the washers and the support 13
  • the support of the flange 30 on the washers 49 is obtained by supports, for example counter-point screws 48 whose suitable tightening makes it possible to mark the polymer material of the flange which causes a footing of the low line.
  • supports for example counter-point screws 48 whose suitable tightening makes it possible to mark the polymer material of the flange which causes a footing of the low line.
  • the effort much higher than that caused by the mounting of the spring washers 47, offers a possibility of easy assembly / disassembly.
  • a large washer 49 is inserted whose diameter is greater than the oblong hole.
  • the washer 49 is placed on a stud 41 by the tightening of a screw 45.
  • the washers 49 create a support plane.
  • the spring washer 47 is compressed and creates in reaction a preload which bears the flange on the washer 49.
  • the flange may deform in a direction where it encounters the least resistance, for example according to a translational movement.
  • the presence of the spring washer guarantees the required flexibility.
  • the support of the flange 30 on the washers 49 is obtained by the reaction created by the compression of the spring washers 47 ( figure 6 ).
  • the washer and the clearance between the flange 30 and the support 13, to which the thickness of the wedge 46 must be subtracted, are chosen so as to have a low preload compared to the load supplied by the point screws 48 on the low line. .
  • the spring washers 47 provide flexibility in the assembly and promotes sliding. They are in particular chosen to support a preload of the order of 150N per washer, for example.
  • the figure 7 illustrates by arrow F the degree of freedom when mounting the flange.
  • the figure 8 schematically an embodiment where the flange has two grooves 80, 81 disposed in the lower part and in the upper part of the flange and in the middle. These two grooves are positioned at two studs 83, 84 arranged on the support 13 to facilitate positioning.
  • the material of the flange is for example a thermostatic material of the type marketed under the trade name PEEK®.
  • Such an assembly principle allows in particular to guide the thermal deformation of the flange in the direction opposing the least resistance. It also reduces the variation of the distance between the pinion and the toothed sector when the ambient temperature varies. This also makes it possible to maintain a parallelism between the axis of the pinion and the axis of the toothed sector which does not compromise the quality of the meshing, because the support between tooth will generally remain a linear support.
  • the pinion can cooperate with a rack system. It also applies to spur gears with parallel axes, conical gears with concurrent axes, left gears, etc.
  • the system according to the invention makes it possible in particular to obtain precise positioning of the antenna and avoids the problems of parallelism resulting from thermal expansion.

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  • Transmission Devices (AREA)

Claims (7)

  1. Bewegungsübertragungsvorrichtung, welche mindestens Folgendes beinhaltet:
    eine Antriebsvorrichtung (26),
    eine Stütze (13),
    • einen ersten Teil (27), welcher aus einem ersten Material mit Wärmedehnungskoeffizient K1 besteht, wobei der erste Teil mit der Antriebsvorrichtung (26) verbunden ist,
    • einen zweiten Teil (29), welcher aus einem ersten Material mit Wärmedehnungskoeffizient K1 besteht, welcher auf der Stütze (13) montiert ist, welche aus einem zweiten Material mit Wärmedehnungskoeffizient K2 besteht,
    dadurch gekennzeichnet, dass sie zudem Folgendes beinhaltet:
    • einen Befestigungsflansch (30) der Antriebsvorrichtung (26), wobei der Befestigungsflansch (30) aus einem Material besteht, welches Wärmevariationsmerkmale K3 aufweist, welche sich von denjenigen des Materials der Stütze und denjenigen des Materials des ersten Teils und des zweiten Teils der Vorrichtung unterscheiden,
    • wobei die Stütze (13) mindestens einen ersten Klotz (41, 42) in ihrem oberen Teil und mindestens einen zweiten Klotz (43, 44) in ihrem unteren Teil beinhaltet,
    • wobei der Befestigungsflansch (30) mindestens eine erste Öffnung (301, 302) und eine zweite Öffnung (303, 304) beinhaltet, welche eine Form besitzt, welche geeignet ist, die Positionierung des Flanschs (30) auf der Stütze (13) zu ermöglichen, wobei die Position der ersten Öffnung und der zweiten Öffnung die Positionierung des Flanschs auf der Stütze auf Höhe der Klötze (41, 42, 43, 44) ermöglicht,
    • eine Federscheibe (47), welche zwischen der Stütze (13) und dem Flansch (30) auf Höhe der Klötze (41, 42, 43, 44) angeordnet ist,
    • einen Keil (46) aus thermostatischem Material, welcher dazu bestimmt ist, zwischen der Federscheibe (47) und der Stütze (13) angeordnet zu werden,
    • eine Unterlegscheibe (49), welche auf Höhe eines der Elemente der Gruppe, bestehend aus der ersten oder der zweiten Öffnung des Flanschs (30) angeordnet ist und sich auf die Klötze (41, 42, 43, 44) stützt, wobei die Höhe hp der Klötze größer ist als die Dicke eb des Flanschs (30), und die Abmessungen der Unterlegscheiben größer als diejenigen der Öffnungen sind, um den Flansch (30) zwischen der Unterlegscheibe (49) und der Stütze (13) zu positionieren,
    • Mittel zum Abstützen (45) einer Unterlegscheibe (49), welche zur Kompression der Federscheibe (47) führen, wodurch eine Vorspannung erzeugt wird, welche den Flansch (30) auf der Unterlegscheibe (49) abstützt und es dem Material des Flanschs (30) ermöglicht, sich ab einer Tiefgangslinie H2 unter der Einwirkung einer Temperaturvariation zu verformen.
    • Mittel zum Gegendruck (48), welche auf der Tiefgangslinie H2 angeordnet sind und geeignet sind, den Flansch (30) auf einer Unterlegscheibe (49) durch eine Kraft abzustützen, welche wesentlich höher ist als diejenige, welche durch die Montage der Federscheiben (47) verursacht wird.
  2. Bewegungsübertragungsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Antriebsvorrichtung ein Motor ist, wobei der erste Teil ein Zahnrad (27) ist, welches mit dem Motor (26) gekoppelt ist, welcher auf der Stütze (13) in Vermittlung des Flanschs (30) montiert ist, der zweite Teil (29) ein Zahnkranz ist, welcher auf der Stütze (13) in Vermittlung eines Führungskranzes (21) und von Kufen (14) montiert ist, welche einen Freiheitsgrad bei der Drehung bereitstellen, wobei der Zahnkranz (29) mit dem Zahnrad (27) zusammenarbeitet, und dadurch, dass die Stütze (13) vier Klötze mit Außengewinde (41, 42, 43, 44) beinhaltet, welche Befestigungsmittel (45) aufnehmen, wobei der Flansch (30) zwei Öffnungen (301, 302) beinhaltet, welche entlang einer ersten horizontalen Linie H1 angeordnet sind und zwei Öffnungen (303, 304), welche entlang einer horizontalen Linie H2 im unteren Teil angeordnet sind, wobei die Form der Öffnungen gewählt ist, um ein leichtes Spiel zu ermöglichen, welches es dem Material des Flanschs ermöglicht, sich in die vertikale Richtung auszudehnen, wobei die beiden Öffnungen (303, 304), welche auf der unteren Linie angeordnet sind, auf den beiden unteren Klötzen (43, 44) der Stütze (13) in Position gebracht werden und mit Befestigungsmitteln befestigt werden.
  3. Bewegungsübertragungsvorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Befestigungsmittel des Flanschs (30) oder das Tiefgangsmittel aus Stellschrauben (48) besteht/bestehen, deren Anzugsdrehmoment geeignet ist, um eine einfache Montage/Demontage zu ermöglichen.
  4. Bewegungsübertragungsvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Flansch (30) aus thermostabilem Kunststoffmaterial besteht und geeignet ist, physikalisch-chemische Beschädigungsphänomene zu vermeiden.
  5. Bewegungsübertragungsvorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Material des Flanschs (30) aus thermostatischem Material besteht.
  6. Bewegungsübertragungsvorrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass die Stütze (13) aus Aluminium besteht und das Zahnrad (27) und der Kranz (29) aus rostfreiem Edelstahl bestehen.
  7. Bewegungsübertragungsvorrichtung nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, dass der Kranz (29) konfiguriert ist, um eine Satellitenkommunikationsantenne zu stützen.
EP17184945.8A 2016-08-30 2017-08-04 System zur montage von zwei teilen in eine bewegungsübertragungsvorrichtung Active EP3291367B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1601277A FR3055384B1 (fr) 2016-08-30 2016-08-30 Systeme de montage de deux pieces dans un dispositif de transmission de mouvement

Publications (2)

Publication Number Publication Date
EP3291367A1 EP3291367A1 (de) 2018-03-07
EP3291367B1 true EP3291367B1 (de) 2019-03-27

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3083016B1 (fr) * 2018-06-22 2021-05-14 Thales Sa Dispositif de compensation d'un jeu mecanique pour un positionneur satcom
CN110474148B (zh) * 2019-08-22 2020-11-20 安徽众诚信息技术咨询有限公司 一种用于空管雷达天线的俯仰机构
CN113922088A (zh) * 2021-10-18 2022-01-11 北京微纳星空科技有限公司 一种低轨卫星天线转台和低轨卫星天线
CN116454630B (zh) * 2023-06-15 2023-09-05 西北工业大学 一种卫星天线的驱动传动装置

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US4254925A (en) * 1979-08-20 1981-03-10 Keuffel & Esser Company Theodolite center mounting means
US5090823A (en) * 1989-10-27 1992-02-25 Scientific-Atlanta, Inc. Pedestal with tilting bearing race
US6293704B1 (en) * 2000-03-21 2001-09-25 The Timken Company Shaft mounting with enhanced stability
RU2225958C1 (ru) * 2002-08-08 2004-03-20 Открытое акционерное общество "Ракетно-космическая корпорация "Энергия" им. С.П.Королева" Привод
JP4591526B2 (ja) * 2008-03-18 2010-12-01 三菱電機株式会社 アンテナ装置

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FR3055384B1 (fr) 2019-11-08
FR3055384A1 (fr) 2018-03-02
EP3291367A1 (de) 2018-03-07

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