FR3086755A1 - TEST SYSTEM FOR A POWER TRANSMISSION - Google Patents

Abstract

The present invention relates to a test system (10) for testing a power transmission box (1) which comprises at least one input shaft (2) and at least one main shaft (6) and at least one secondary shaft (7) output, said test system (10) comprising a first module (20) comprising a main wheel (22) and a main loading system (25) by input shaft (2). A second module (30) comprises for each input shaft (2) a main multiplier gear (32) mechanically connected to a main loading system (25) by a main kinematic link (37), said second module (30 ) comprising for each secondary shaft a secondary multiplier gear (40) which is mechanically connected to a secondary shaft (7) by a secondary kinematic link (50).

Description

Power transmission test system

The present invention relates to a system for testing a power transmission box, and in particular a power transmission box comprising at least two output shafts.

A main power transmission box of a helicopter usually has at least one input and at least one output. Each entry can take the form of an entry shaft mechanically connected to a motor. A first exit can take the form of an exit rotor mast rotating a main rotor of the helicopter. In addition, the power transmission can include a second output in the form of an output shaft which is mechanically connected to a rotor participating in the control of the helicopter's yaw motion.

A test system for such a power transmission unit has the function of setting in motion the various rotary members of the power transmission box. In addition, the test system has the function of exerting a torque on each input shaft and slowing down the outputs.

A first generation test system includes a motor connected to each input and a charging means connected to each output. Such a test system is qualified as "kinematically open" for convenience insofar as the inputs and outputs are not connected by a kinematic chain.

A first generation test system can have multiple drawbacks such as a high energy operating cost due to the "kinematically open" nature of the installation and a lack of versatility. Such a test system is sometimes only usable for a particular gearbox.

A second generation test system represents a "kinematically closed" test system kinematically connecting outputs and inputs.

A second generation helicopter system includes a first module. This first module is fitted with a main wheel to be mechanically connected to the output rotor mast of the gearbox to be tested. The main wheel is mechanically connected to a drive motor.

In addition, the first module comprises a main loading system per input, each main loading system comprising a first rotating member engaged on the main wheel and a second rotating member which is mechanically connected to the associated input by a mechanical entry system. Such a mechanical input system can take the form of a speed multiplier. In the presence of multiple entrances, mechanical entrance systems can form a single mechanical unit.

In addition, the first module is mechanically connected to the output shaft by a mechanical output system.

A loading system makes it possible to adjust a mechanical torque applied to the members which are connected to it. A mechanical system can take various forms.

According to one embodiment, a loading system comprises two flanges with holes. One flange is manually rotated relative to the other flange to statically introduce mechanical torque.

According to another embodiment, a loading system comprises a rotating hydraulic cylinder. A cylinder housing replaces one of the above flanges and a rotating cylinder rotor replaces the other flange.

According to another embodiment, a loading system includes a slip generator. For example, a slip generator of the type known under the brand ROTODIFF® can be used. Such a slip generator can comprise two movable members in rotation at different speeds. The slip generator can then generate a mechanical torque proportional to the pressure of a hydraulic fluid.

Regardless of this aspect, the first module forms equipment fitted with a large wheel rotated by each output of the power transmission box and by a drive motor. In addition, this large wheel engages a main loading system by entry.

A second generation test system can optimize the electrical energy consumed due to its closed kinematics.

Such a first module can possibly be used to test various helicopter power transmission boxes. However, such a first module can be expensive, having a value of the order of several million euros.

In addition, this system does not allow testing of a power transmission box of a hybrid rotorcraft setting in motion a rotor and two propellers or equivalent.

In addition, such a test system does not make it possible to simulate certain flight phases of such a hybrid rotorcraft and for example a flight phase during which the propellers are not driven by the power transmission box but participate in the setting in motion of the power transmission box. Such a phase is called "windmilling" in English.

WO 2012/024677 and US 8758184 describe a mechanically open but electrically closed test system for testing a power transmission box having two input shafts, an output rotor mast and an output shaft.

This test system is equipped with an upper unit which is engaged on the output rotor mast and which is connected to two first motors. In addition, the test system has two second motors connected to a transmission unit which drives the two input shafts. The transmission unit is removable to be adapted to the power transmission to be tested. Finally, the test system includes an electrical generator mechanically connected to the output shaft.

Document EP1080353 describes a closed test system for testing a power transmission box having two input shafts, an output rotor mast and an output shaft.

The test system comprises a support carrying jacks connected to a casing of the power transmission box

In addition, the test system comprises an upper test transmission engaged on the output rotor mast and a lower test transmission mechanically connected to the input shafts and the output shaft. A first engine sets in motion the lower test transmission. To close the mechanical chain, the test system comprises a torque adjustment system connected on the one hand to the lower test transmission and, on the other hand to the upper test transmission by a connecting shaft. A second electric motor is then connected to the torque adjustment system to adjust a mechanical test torque.

The object of the present invention is therefore to propose an innovative test system making it possible to test various power transmission boxes in an innovative manner and in particular a power transmission box for a hybrid rotorcraft setting in motion a lift rotor and two propellers or even also a helicopter power transmission.

The invention relates to a test system for testing a power transmission box, the power transmission box comprising at least one input shaft and at least two outputs, said at least two outputs comprising a main shaft and at least a secondary shaft, said testing system comprising a first module, said first module comprising a main wheel configured to be linked in rotation to the main shaft, said first module comprising a main loading system by input shaft, said main loading system comprising a first rotating member connected to the main wheel and a second rotating member, said testing system comprising a second module configured to be mechanically connected to the first module and to each input shaft of said at least an input tree,

The second module comprises for each input shaft of said at least one input shaft a main multiplier gear. Said main multiplier gear comprises a main multiplier wheel which is mechanically connected to a second rotating member of a said main load system by a main kinematic link which can optionally be inhibited. The main multiplier gear includes a main multiplier gear engaged on the main multiplier wheel. In addition, said second module comprises for each secondary shaft of said at least one secondary shaft a secondary multiplier gear. Said secondary multiplier gear comprises a secondary multiplier wheel mechanically connected to a secondary shaft by a secondary kinematic link, said secondary multiplier gear comprising a secondary multiplier pinion engaged on the secondary multiplier wheel. Said testing system further comprises for each input shaft of said at least one input shaft a kinematic input connection configured to mechanically connect this input shaft to at least one secondary multiplication pinion and to at least one main gear.

The expression “loading system” designates a system for transmitting a torque and for adjusting the torque exerted on a rotating member. Such a loading system may include a known system and for example one of the systems described above, namely two flanges with holes, a rotating hydraulic cylinder or a slip generator.

In addition, the test system may include at least one motor, or even a single motor for setting in motion the various members. For example, the motor is kinematically connected to the main wheel.

This testing system can include members of an existing system and for example a first module of the type described above, which makes it possible to make substantial financial savings.

In addition, this test system can be used to test either a helicopter power transmission or a hybrid rotorcraft. For example, the second module can be modified according to the power transmission box to be tested. According to one possibility, the second module can comprise, as a base, two multiplying gears and two secondary multiplying gears in order to be able to test a power transmission box comprising one or two inputs and two or three secondary outputs.

In addition, each main charging system can be used to adjust the torque exerted at an input to the power transmission to be tested.

In addition, each secondary kinematic link can include, if necessary, a charging system in order to be able to adjust a torque exerted at an output of the power transmission box in order to simulate the presence of a power consuming propeller. Each secondary kinematic link can possibly be devoid of a charging system or can inhibit a charging system in order for example to simulate the presence of a propeller which drives the power transmission box in a particular flight phase .

As a result, this testing system is likely to be versatile, to be reconfigurable relatively quickly and to include a first existing module.

In addition, this test system allows each secondary shaft to be connected to an input and not to the main wheel. This arrangement has the merit of representing more faithfully the actual operation of a power transmission box. In addition, this arrangement can allow mechanical power to be recovered at each output shaft to be reinjected at the inputs of the power transmission box tested by a closed mechanical loop without degrading the performance of the test system.

The testing system may have one or more of the following features.

Thus, the main kinematic link can comprise at least one intermediate shaft fixed to the main multiplication wheel and configured to be fixed to a second rotating member of a main loading system.

For example, a single intermediate shaft connects a main multiplication wheel and the second rotating member of a main loading system. This single intermediate shaft can be fixed in a removable or non-removable manner to the main multiplication wheel, for example by welding, and can be fixed in a non-removable or removable manner to a second rotating member, for example by screws or the like.

According to one aspect, a secondary multiplication pinion and a main multiplication pinion can be integral in rotation about a same axis of rotation, said secondary multiplication pinion and said main multiplication pinion being connected by a connecting shaft which extends along said axis of rotation.

According to one aspect, the kinematic input link can include a fixing shaft reversibly and non-destructively attached to a secondary multiplying pinion or to a main multiplying pinion to be secured in rotation on request.

According to one example, a secondary multiplication pinion and a main multiplication pinion are mutually parallel and connected by a connection shaft, the secondary multiplication pinion being moreover secured directly and reversibly to a fixing shaft, for example by screws.

Therefore, it is possible to disconnect the second module from the input shaft, for example to simulate an engine failure.

In one example, a kinematic input link can include an input torque meter.

For example, a kinematic input link includes a fixing shaft carrying an input torque meter, the input torque meter being attached to an input shaft if necessary.

In one aspect, said first rotating member can be meshed by said main wheel.

In one aspect, the secondary kinematic link can be removable.

The term "removable" used subsequently means that it is possible to disconnect an organ in a non-destructive manner, relatively quickly and in a non-irreversible manner.

In one aspect, the secondary kinematic link can include a secondary torque meter.

According to one aspect, the secondary kinematic link can include a return pinion and a connection member making it possible to link the return pinion and a secondary shaft in rotation around an axis of rotation of the secondary shaft, said kinematic link comprising a connecting shaft secured to the secondary multiplying wheel, said secondary link having a removable connecting means connecting said return pinion and said connecting shaft.

In one aspect, the connecting means may include a gear.

In one aspect, the connecting means may include a secondary charging system.

According to one aspect, said at least one input shaft comprising at least two input shafts associated respectively with two said main multiplier gears, said second module comprises at least one disengageable connection pinion to link said two main multiplier gears on request.

Such a connection pinion can be used to simulate an engine failure.

According to one aspect, said test system may include a computer connected to each main loading system and to a plurality of torque meters, said computer being configured to control each main loading system as a function of the data transmitted by said torque meters and at least one torque setpoint.

Such a computer can if necessary be connected to the above-mentioned input torque meter and secondary torque meter.

The invention and its advantages will appear in more detail in the context of the description which follows with examples given by way of illustration with reference to the appended figures which represent:

- Figure 1, a view of a test system according to the invention applied to test a power transmission box having two functional inputs and three outputs,

FIG. 2, a view of a test system according to the invention applied to test a power transmission box having two functional inputs, one of which is inhibited and three outputs, and

- Figure 3, a view of a test system according to the invention applied to test a power transmission box with two inhibited inputs and three outputs, two outputs operating in motor mode.

The elements present in several separate figures are assigned a single reference.

FIG. 1 illustrates a test system according to the invention making it possible to test power transmission boxes 1 for both helicopters and hybrid rotorcraft. Such a power transmission box 1 capable of being tested comprises at least one input shaft 2 intended to be set in motion by an engine within an aircraft.

In addition, the power transmission box 1 comprises at least two outputs 5 each intended to set in motion an organ of an aircraft. One of the outlets takes the form of a tree conveniently called "main tree 6". Such a main shaft 6 drives, for example, a lift and / or propulsion rotor within the aircraft. In addition, at least one output 5 takes the form of a secondary shaft 7. A secondary shaft 7 can drive a yaw motion control rotor, a propeller ...

FIG. 1 illustrates a power transmission box for a hybrid aircraft provided with a main shaft 6 intended to drive a rotor and two secondary shafts 8,9 intended in particular to drive and / or to be driven by two propellers respectively.

The test system 10 comprises a first module 20.

This first module 20 is provided with a main wheel 22. The main wheel 22 can be carried by a frame 21 of the first module while being movable in rotation relative to the frame 21. The main wheel is configured to be mechanically linked to the main shaft 6 so that a rotation of the main shaft 6 causes a rotation of the main wheel. For example, the main wheel 22 is integral with a shaft 23 which can be connected to the main shaft 6 by conventional fixing means 24. Such fastening means may include grooves, screws, flanges, etc.

In addition, the first module 20 comprises at least one main loading system 25, and for example a main loading system 25 per input shaft 2 possible. Each main loading system 25 can be carried by the frame 21. Each main loading system comprises a first rotating member 28 kinematically connected to the main wheel 22 and a second rotating member 29. In particular, the first rotating member 28 can be meshed by the main wheel 22 by including teeth engaged on the teeth of the main wheel. The main wheel may have more teeth than the first rotating member.

Optionally, the first module can permanently comprise two main charging systems 25 in order to be able to test without modification both a power transmission box with one input and a power transmission box with two inputs.

According to another aspect, said test system 10 comprises a second module 30 of multiplier gears. This second module 30 is kinematically connected to the first module 20, and in particular to at least one or even each main loading system 25, as well as possibly to at least one input shaft or even to each input shaft according to the test executed. The second module 30 can be a speed multiplier module and can be in one piece.

For example, to test normal operation of the power transmission box of FIG. 1, a first main charging system 26 is kinematically connected by the second module to the first associated input shaft 3. A second main loading system 27 is kinematically connected by the second module to the second associated input shaft 4.

To this end, the second module 30 may comprise for each input shaft 2 a main multiplier gear 32 associated with this input shaft 2, and therefore two main multiplier gears 32 associated respectively with two input shafts 3, 4 according to Figure 1. Each main multiplier gear 32 can be carried by the same frame 31 of the second module.

Each main multiplier gear 32 may include a main multiplier wheel 35 engaged on a main multiplier pinion 36. Each main multiplier wheel 35 and each main multiplier pinion 36 may be parallel to the main wheel 22. Other arrangements are possible.

The main multiplier gear 36 has fewer teeth than the main multiplier wheel 35 engaged therewith.

The main multiplication wheel 35 is mechanically connected by a main kinematic link 37 to the second rotating member 29 of the associated main loading system 25. This main kinematic link 37 can be at least partially removable and can comprise an intermediate shaft 38 fixed to the main multiplication wheel 35. This intermediate shaft 38 can be fixed to the second rotating member 29 directly or indirectly by at least one other shaft for example .

In addition, the main multiplier pinion 36 is mechanically connected at least by a removable kinematic input link 45 to an input shaft 2. When the kinematic input link 45 is in place, a rotation of the main multiplier pinion 36 drives the rotation of at least one input shaft via at least one kinematic input link 45.

Such an input kinematic link 45 can comprise at least one fixing shaft 46 and / or an input torque meter 47. For example, a fixing shaft 46 carries an input torque meter 47. The input torque meter 47 can then be temporarily fixed to an input shaft 2 and the connecting shaft can be temporarily fixed to the second module 30.

Furthermore, the second module 30 can comprise, for each secondary shaft 7, an associated secondary multiplier gear 40, and therefore two secondary multiplier gears 40 respectively associated with two secondary shafts according to FIG. 1. Each secondary multiplier gear 40 can be carried by the same frame 31 of the second module 30.

Each secondary multiplier gear 40 can comprise a secondary multiplication wheel 43 engaged on a secondary multiplication pinion 44. Each secondary multiplication wheel 43 and each secondary multiplication pinion 44 can be parallel to the main wheel 22.

The secondary multiplication gear 44 has fewer teeth than the secondary multiplication wheel 43 engaged with it.

In addition, each secondary multiplication wheel 43 is mechanically connected to a secondary shaft 7 by a secondary kinematic link 50. This kinematic link can comprise at least one removable element and / or a secondary torque meter 58.

According to FIG. 1, each secondary kinematic link 50 includes a return pinion 51. A connection member 56 makes it possible to link the return pinion 51 and a secondary shaft 7 in rotation around an axis of rotation AX2 of the secondary shaft 7 For example, the connection member 56 comprises a shaft 57 fixed to the return pinion. This shaft 57 carries a secondary torque meter 58. The secondary torque meter then comprises means for connection to a secondary shaft, splines for example.

In addition, the secondary kinematic connection comprises a connecting shaft 55 integral in rotation with the corresponding secondary multiplying wheel 43 and a removable connecting means 52 mechanically connecting the return pinion 51 and the connecting shaft 55.

According to one possibility, the second module permanently comprises two main multiplier gears and two secondary multiplier gears. Depending on the geometry of the power transmission to be tested or the test to be performed, the secondary kinematic connections are adapted. For example, if the power transmission to be tested has a single secondary shaft, only one secondary kinematic link is arranged. According to another example, two connecting shafts 55 are permanently arranged, the connecting means being adapted according to the power transmission box to be tested or the test to be carried out.

In addition, depending on the test to be performed, the connecting means can take various forms. According to Figure 1, the connecting means 52 may include a secondary charging system 53. Optionally, the charging system can be inhibited so as not to introduce mechanical torque.

According to the variant of Figure 3, the connecting means 52 comprises a toothed wheel 54 to simulate a phase of "windmilling".

According to another aspect, the secondary multiplication pinion 44 and the main multiplication pinion 36 associated with the same entry can be merged by forming a single pinion.

According to the example of FIG. 1, the secondary multiplication pinion 44 and the main multiplication pinion 36 are separate and integral in rotation about the same axis of rotation AX1. For example, a secondary multiplication pinion 44 and a main multiplication pinion 36 can be connected by a connection shaft 39 which extends along said axis of rotation AX1. A secondary multiplication gear 44 and a main multiplication gear 36 can form a double gear.

Consequently, each kinematic input link 45 is configured to mechanically connect an input shaft to at least one secondary multiplication pinion 44 and / or to at least one main multiplication pinion 36, for example to a pinion subsystem including the secondary multiplication gear 44 and the main multiplication gear 36.

According to the example of FIG. 1, each main multiplication pinion 36 is secured by a shaft to a secondary multiplication pinion 44 which is itself fixed to a kinematic entry link 45 at least partially removable.

In one aspect, a kinematic input link 45 may include a fixing shaft 46 and / or an input torque meter 47. For example, the fixing shaft 46 is fixed in a reversible and non-destructive manner to a multiplication pinion secondary 44 or to a main multiplication pinion 36 to be secured to it in rotation on request by usual means. According to the example of FIG. 1, a fixing shaft is screwed to a secondary multiplication pinion 44.

According to another aspect, in the presence of at least two main multiplier gears, the second module can comprise a module which is provided with a disengageable connection pinion 62 to link on request the two main multiplier gears 32. For example, this module comprises a connecting wheel 60 by secondary multiplying pinion, each connecting wheel being secured directly to a secondary multiplying pinion by a shaft 61. The connection pinion 62 is then movable in translation between a engaged position in which the connection pinion 62 is engaged with each connecting wheel 60 and a disengaged position visible in FIG. 1 where the connection pinion 62 is not engaged with any connecting wheel 60.

Furthermore, to set in motion the power transmission unit to be tested, the test system may include at least one MOT engine. According to the example in FIG. 1, a MOT engine can set the kinematic chain into motion by rotating the main wheel 22. The engine can, however, drive any other rotating member of the test system.

According to another aspect, the test system 10 can comprise a computer 70 connected to each main loading system 25 and to a plurality of torque meters 58, 47, and in particular to the input torque meters and to the secondary torque meters. The computer 70 may for example include at least one processor 71 and at least one memory 72, at least one integrated circuit, at least one programmable system, at least one logic circuit, these examples not limiting the scope given to the expression " calculator ”.

In addition, the computer can be connected to a screen 73 and to a data entry system 74, such as a keyboard and / or a mouse ...

Thus, an operator can control the computer by programming at least one torque setpoint. The computer 70 is then configured to control each main charging system 25 and if necessary each secondary charging system 53 as a function of the data transmitted by said torque meters 47, 58 and at least one torque setpoint.

Thus, to test a power transmission unit according to FIG. 1, the test system can comprise a first module having two main load systems 25 connected respectively to two main multiplier gears. In addition, the test system can comprise two secondary multiplier gears connected respectively to the two main multiplier gears and to two input shafts 3, 4 via two input couplers 47. The two multiplier gears are further connected to two shafts secondary via in particular two secondary charging systems 53, 54 and two secondary torque meters 58.

The connection pinion 62 is also in the disengaged position.

Consequently, the motor MOT sets in motion the various rotary members by the main wheel 22.

Mechanical power is developed at each input shaft to load the power transmission box 1.

The power developed at each secondary shaft 8, 9 is fed back into the corresponding input shaft 3, 4 via the associated secondary multiplier gear 41, 42.

The torque exerted on each secondary shaft 8, 9 is adjusted by the computer 70 by respectively controlling the secondary loading system 53, 54 connected to this secondary shaft 8, 9 according to a torque setpoint and the torque measured by the corresponding secondary torque meter 58.

The torque exerted on each input shaft 3, 4 is adjusted by the computer 70 by respectively controlling the main loading system 26, 27 connected to this input shaft 3,4 according to a torque setpoint and of the torque measured by the corresponding input torque meter 47 or even of the torques measured by the corresponding output torque meters 58. To follow each torque setpoint, the computer controls the main loading systems 26, 27 so that the torque exerted on each input shaft 3,4 tends towards the value of the corresponding torque setpoint, whatever the torques exerted on the secondary shafts 8, 9 corresponding.

Referring to Figure 2, the test system simulates an engine failure.

For this purpose, a kinematic input link 45 is disconnected from the second module, for example by removing the input torque meter from this link. According to Figure 2, the kinematic input link 450 is disconnected.

Optionally, the kinematic chain connecting the main wheel 22 to the corresponding main multiplication pinion 360 is also inhibited, for example by removing an intermediate shaft 38.

Consequently, the connection pinion 62 is moved to reach its engaged position.

The power developed at the level of the secondary shaft 9, normally connected to the inhibited input shaft, is fed back into the other input shaft 3 via the connection pinion 62.

The torque exerted on each secondary shaft 8, 9 is adjusted by the computer 70 by respectively controlling the secondary loading system 53, 54 connected to this secondary shaft 8, 9 according to a torque setpoint and the torque measured by the corresponding secondary torque meter 58.

The torque exerted on the driven input shaft 3 is adjusted by the computer 70 by controlling the main loading system 26 connected to this input shaft 3 according to a torque setpoint and the torque measured by the input torque meter 47 corresponding or even the sum of the torques measured by the output torque meters 58. To follow the torque setpoint, the computer controls the corresponding main load system 26 so that the torque exerted on the drive shaft input 3 and measured by the input torque meter 47 tends towards the value of the torque setpoint, whatever the torques exerted on the secondary shafts 8, 9.

Referring to Figure 3, the test system simulates an operating phase of "windmilling". During this flight phase, the propellers connected to the secondary shafts behave like mechanical power generators.

In this configuration, the input shafts 3, 4 are physically disconnected from the second module 30. Each kinematic input link 45 is then disconnected from the second module, for example by removing the input torque meter from this link.

In addition, the second module 30 is configured to decouple the two secondary shafts. Consequently, the connection pinion 62 is moved to reach its disengaged position.

In addition, the secondary load systems are inhibited, for example by inhibiting a torque differential speed system between the first and second rotating members of each secondary load system or by not phase shifting two hole flanges as part of a flange system.

Alternatively, an operator can replace each secondary loading system with a simple toothed wheel 54.

Consequently, the torque exerted on each secondary shaft 8, 9 is adjusted by the computer 70 by controlling respectively the main loading system connected to this secondary shaft 8 by the second module as a function of a torque and torque setpoint. measured by the corresponding secondary torque meter 58.

In Figures 1 to 3, arrows illustrate the transmission of movement according to the variants.

Naturally, the present invention is subject to numerous variations as to its implementation. Although several embodiments have been described, it is understood that it is not conceivable to identify exhaustively all the possible modes. It is of course conceivable to replace a means described by an equivalent means without departing from the scope of the present invention.

Claims (10)

1. Test system (10) for testing a power transmission box (1), the power transmission box (1) comprising at least one input shaft (2) and at least two outputs (5), said at least two outputs comprising a main shaft (6) and at least one secondary shaft (7), said testing system (10) comprising a first module (20), said first module (20) comprising a main wheel (22 ) configured to be linked in rotation to the main shaft (6), said first module (20) comprising a main loading system (25) per input shaft (2), said main loading system ( 25) comprising a first rotating member (28) connected to the main wheel (22) and a second rotating member (29), said testing system (10) comprising a second module (30) configured to be mechanically connected to the first module (20) and to each input shaft of said at least one input shaft, characterized in that said second module (30) comprises for each input shaft (2) of said at least one input shaft a main multiplier gear (32), said main multiplier gear (32) comprising a main multiplier wheel (35) mechanically connected to a second rotating member (29) of a said main load system (25) by a main kinematic link (37), said main multiplier gear (32) comprising a main multiplier pinion (36) engaged on the main multiplication wheel (35), said second module (30) comprising for each secondary shaft of said at least one secondary shaft a secondary multiplier gear (40), said secondary multiplier gear (40) comprising a connected secondary multiplier wheel (43) mechanically to a secondary shaft (7) by a secondary kinematic link (50), said secondary multiplier gear (40) comprising a multiplication pinion condaire (44) engaged on the secondary multiplication wheel (43), said test system (10) comprising for each input shaft of said at least one input shaft a kinematic input link (45) configured for mechanically connect this input shaft to at least one secondary multiplication pinion (44) and / or to at least one main multiplication pinion (36). 2. Test system according to claim 1, characterized in that said main kinematic link (37) comprises at least one intermediate shaft (38) fixed to the main multiplication wheel (35) and configured to be fixed to a said second rotating member (29). 3. Test system according to any one of claims 1 to 2, characterized in that said secondary multiplication pinion (44) and said main multiplication pinion (36) are integral in rotation about the same axis of rotation. (AX1), said secondary multiplication pinion (44) and said main multiplication pinion (36) being connected by a connection shaft (39) which extends along said axis of rotation (AX1). 4. Test system according to any one of claims 1 to 3, characterized in that said kinematic input link (45) includes a fixing shaft (46) fixed in a reversible and non-destructive manner to a multiplication pinion secondary (44) or a main multiplication pinion (36) to be secured in rotation on request. 5. Test system according to any one of claims 1 to 4, characterized in that said kinematic input link (45) includes an input torque meter (47). 6. System claims 1 to of trials 5, according to Moon any of characterized in that meshed by said ! that said first main wheel member (22). rotating (28) East 7. Claims system 1 to of trials 6, according to Moon any of characterized in that is removable. that said bond secondary kinematics (50) 8. Claims system 1 to of trials 7, according to Moon any of characterized in that that said bond secondary kinematics (50) includes a secondary torque meter (58). 9. Test system according to any one of claims 1 to 8, characterized in that said secondary kinematic connection (50) includes a return pinion (51) and a connection member (56) making it possible to link in rotation the return pinion (51) and a secondary shaft (7) around an axis of rotation (AX2) of the secondary shaft (7), said kinematic connection comprising a connection shaft (55) integral with the secondary multiplication wheel (43), said secondary kinematic connection (50) having a removable connection means (52) connecting said return pinion (51) and said connection shaft (55). 10. Test system according to claim 9, characterized in that said connecting means (52) comprises a toothed wheel (54). 11. Test system according to claim 9, characterized in that said connecting means (52) comprises a secondary loading system (53, 54). 12. Test system according to any one of claims 1 to 11, characterized in that said at least one input shaft comprising at least two input shafts associated respectively with two said main multiplier gears, said second module comprises at least one disengageable connection pinion (62) to link said two main multiplier gears (32) on request. 13. Test system according to any one of claims 1 to 12, characterized in that said test system (10) comprises a computer (70) connected to each main loading system (25) and to a plurality of torque meters (58, 47), said computer (70) being configured to control each main loading system (25) according to the data transmitted by said torque meters (47, 58) and at least one torque setpoint .