CN103775212B - A kind of fan fails brake unit of aero-engine - Google Patents
A kind of fan fails brake unit of aero-engine Download PDFInfo
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- CN103775212B CN103775212B CN201210413857.7A CN201210413857A CN103775212B CN 103775212 B CN103775212 B CN 103775212B CN 201210413857 A CN201210413857 A CN 201210413857A CN 103775212 B CN103775212 B CN 103775212B
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Abstract
The fan fails brake unit of a kind of aero-engine, comprising: fan shaft, is provided with rotor brake dish；Fan blade, it is arranged on fan disk；Bearing support, its one end is arranged on casing, and bearing support is provided with stator brake disc, and stator brake disc is radially spaced apart circumferentially around rotor brake dish and with rotor brake dish；Bearing assembly, its one end is couple to the other end on fan shaft and is connected on bearing support with predetermined moment of flexure；Wherein, when fan blade ruptures, fan shaft be deflected outward by so that the Breaking bending moment between bearing assembly and bearing support exceed predetermined moment of flexure time, bearing assembly and bearing support are disconnected thus rotor brake dish engages with stator brake disc.During fan blade failure fracture, rotor brake dish touches with stator brake disc and rubs, and limits the bending radial displacement of fan shaft, and decreases fan shaft rotating speed, reduces FBO load.
Description
Technical field
The present invention relates to the fan fails brake unit of a kind of aero-engine.
Background technology
In the middle of Aeroengine Design, it is necessary to specified by the pardon of seaworthiness, the most harsh
When condition is to occur fan blade to come off, electromotor can contain blade breakage, and cut out
Remain a need for after electromotor with windmill rotating speed continued operation more than 3 hours.Fan blade comes off
Time (FBO, Fan Blade Out), electromotor operates at higher rotating speed, the radial direction of generation
Unbalanced load (FBO load) is very big, reaches tens tons, and radially unbalanced load passes through axle
Hold and pass to bearing support structure, be delivered to Middle casing afterwards, then pass by installing joint system
Passing aircraft, if requiring, electromotor bears FBO load completely, then strong to the structure of electromotor
Degree proposes the highest requirement.
The method of tradition reply FBO load is to use bigger design safety factor (DSF), strengthens sending out
The intensity of motivation, as strengthened the intensity of bearings, strengthening the intensity of Middle casing, reinforcement peace
The intensity etc. of dress joint, and the weight that such design makes electromotor is greatly increased, the most existing
For civil aviation will affect the fuel economy of electromotor so that it is in the fierce market competition
It is on a sticky wicket.
Summary of the invention
First purpose of the present invention is when electromotor generation fan blade comes off to drop
Low FBO load.
Second object of the present invention is to improve safety, makes electromotor can use less peace
Overall coefficient designs lighter structure, to obtain more preferable fuel economy.
Third object of the present invention makes engine structure while being to reduce FBO load
Destructiveness be down to relatively low degree.
Device disclosed in this invention, has and limits the maximum radial position that engine shaft bending produces
Move and the effect of deflection angle.Under FBO load, bearing support and clutch shaft bearing assembly
Disconnect, and then after engine axis bending, as rotor brake dish and the stator of brake unit
Brake disc touches mill, constrains the free beat of fan shaft in radial directions, limits wind
The maximum deflection angle of fan axle, so can reduce and produce on the second bearing assembly and other structures
Raw bending load.The maximum of the maximum radial displacement of fan blade and deflection angle and fan shaft
Radial displacement and deflection angle are basically identical, within being limited in maximum license radial displacement, can prevent
Only fan blade and casing produce bigger collision and gross distortion and clamping stagnation, thus prevent pole
High pulling torque, and then protection fan shaft structure, it is also possible to prevent multiple blade from again rupturing and increasing
Unbalanced load.
On the other hand, the present invention has the effect reducing FBO load.Rotor brake dish and quiet
After sub-brake disc touches mill, producing certain frictional force, bearing support structure is by Braking
On fan shaft so that the rotating speed of fan shaft reduces rapidly.Radial direction imbalance on fan shaft carries
Square being directly proportional of lotus and its rotating speed, the reduction of rotating speed reduces the unbalanced load of fan shaft.
Fan blade comes off moment, and the destruction producing engine structure is maximum, when having passed through danger
Danger point, the rotating speed of fan shaft is substantially reduced, and the degree of crook of fan shaft reduces the most accordingly, makes
The rotor brake dish of the brake unit of obtaining and stator brake disc disengage, and no longer produce frictional resistance, this
Time electromotor enter windmill condition and even running.
Specifically, the invention discloses the fan fails brake unit of a kind of aero-engine, its
Including: fan shaft, it is provided with rotor brake dish；Fan blade, it is arranged on described wind
On fan axle, described fan blade the most described rotor brake dish is positioned on fluid flow direction
Trip；Bearing support, its one end is arranged on casing, and described bearing support is provided with stator
Brake disc, described stator brake disc circumferentially around described rotor brake dish and with described rotor system
Moving plate is radially spaced apart；Bearing assembly, its one end be couple on described fan shaft the other end with
Predetermined moment of flexure is connected on described bearing support；Wherein, when described fan blade ruptures,
Described fan shaft is deflected outward by so that dashing forward between described bearing assembly and described bearing support
Bent square when exceeding described predetermined moment of flexure, described bearing assembly and described bearing support depart from even
Connect thus described rotor brake dish engages with described stator brake disc.
Preferably, described stator brake disc is fixture, when rotor brake dish moves radially,
Less than stator brake disc position.
Preferably, the lateral surface of described rotor brake dish is rubbing surface, stator brake disc interior
Side is rubbing surface.
It is highly preferred that include on described rubbing surface for increase the projection of frictional force, indenture or
Decorative pattern.
Preferably, described bearing assembly and described bearing support connect with overload disabling elements, as
Shear pin or shearing bolt.
Preferably, the most described bearing assembly of described bearing support is in described fluid flowing side
To downstream be couple on described fan shaft with another bearing assembly.
Preferably, described rotor brake dish uses such as pin or tongue-and-groove or profile of tooth to highlight structure admittedly
Surely it is connected on described fan shaft.
Preferably, described bearing assembly includes outer race assembly, bearing inner ring assembly and can
The bearing rolling being rotationally arranged between described outer race assembly and described bearing inner ring assembly
Son, wherein, described bearing inner ring assembly is connected on described fan shaft, described outer race group
Part is connected on described bearing support.
Preferably, the front end of described rotor brake dish adjoins described bearing roller, described fan shaft
It is additionally provided with in described fluid flow direction phase in the rear end of adjacent described rotor brake dish
The nut of described rotor brake dish is compressed on anti-direction.
Preferably, described stator brake disc itself be one, or described stator brake disc and
Described bearing support is one.
Beneficial effects of the present invention is as follows:
Under FBO load, rotor brake dish collides with stator brake disc, limits wind
The maximum radial displacement of fan axle and deflection angle, on the one hand reduce at the second bearing and other structures
Bending load, on the other hand can prevent fan blade and the casing bigger collision of generation from seriously becoming
Shape and clamping stagnation, produce very big moment of torsion, destroy fan shaft structure, or multiple blade again rupture and
Increase unbalanced load.
When FBO initially occurs, produce bigger between rotor brake dish and stator brake disc rubbing surface
Brake force, makes fan propeller rotating speed reduce rapidly, makes unbalanced load under FBO state rapid
Reduce (unbalanced load substantially to square being directly proportional of fan shaft rotating speed).
After fan shaft rotating speed is substantially reduced, rotor brake dish disengages with stator brake disc, no
Producing brake force again, aero-engine enters windmill condition continuous running smoothly.
Accompanying drawing explanation
In order to explain the present invention, its illustrative embodiments be will be described below with reference,
In accompanying drawing:
Fig. 1 is the schematic structure of the electromotor fan fails brake unit when normal condition
Figure；
Fig. 2 is the perspective view of rotor brake dish；
What Fig. 3 was electromotor in the instantaneous fan fails brake unit of fan blade fracture is schematic
Structure chart；
Fig. 4 is that electromotor enters the fan fails brake unit of windmill condition in fan blade fracture
Schematic diagram；
Similar features in different figures is by similar reference instruction.
Detailed description of the invention
As it is shown in figure 1, it illustrates the electromotor fan fails braking when normal operation
The schematic diagram of device.Specifically, this fan fails brake unit specifically includes that fan
Axle 8, fan blade 10, bearing support 3 and clutch shaft bearing assembly 16.Wherein, fan
Axle 8 extends along engine axis 14, is provided with rotor brake dish 1.Fan blade 10
Being arranged on fan shaft 8, this fan blade 10 this rotor brake dish 1 relative flows at fluid
Upstream it is on direction.Fan blade 10 is arranged in this fan blade 10 prolongs radially outward
Stretch and accommodated by fancase 11 and protect.The rear end of bearing support 3 is fixed to intermediary
On casing 12, front end has extended internally stator brake disc 2, this stator brake disc 2 circumferentially ring
It is radially spaced apart around this rotor brake dish 1 and with this rotor brake dish 1, stator brake disc 2
Medial surface be used as rubbing surface.Clutch shaft bearing assembly 16 include clutch shaft bearing outer ring assembly 5,
Ring assemblies 7 and be rotatably disposed at this clutch shaft bearing outer ring assembly 5 and in clutch shaft bearing
Clutch shaft bearing roller 6 between one bearing inner ring assembly 7, wherein, this clutch shaft bearing outer shroud group
Part 5 connects by the front end of shear pin 4 and bearing support 3 is fixing, this clutch shaft bearing internal ring
Assembly 7 is fixedly attached on this fan shaft 8.Shear pin 4 can bear at bearing support 3
And the predetermined moment of flexure between the clutch shaft bearing outer ring assembly 5 of clutch shaft bearing assembly 16, i.e.
In the range of this predetermined moment of flexure, this shear pin 4 will not rupture, and once more than this predetermined moment of flexure, this is cut
Cut pin 4 will rupture.It is appreciated that this shear pin 4 can be replaced by other overload disabling elements,
Bolt is sheared for example, it is also possible to use.The close rear end of this bearing support 3 is also associated with
Two bearing assemblies 17, this second bearing assembly 17 includes the second outer race assembly 18, second
Bearing inner ring assembly 19 and be rotatably disposed at this second outer race assembly 18 and second
The second bearing roller 13 between bearing inner ring assembly 19, wherein, this second outer race group
Part 18 and bearing support 3 is fixing connects, this in second ring assemblies 19 be fixedly attached to this wind
On fan axle 8.Bearing support 3 is circumferentially fixed on Middle casing 12 and by clutch shaft bearing
Assembly 16 and the second bearing assembly 17 are radially supported on fan shaft 8.
As in figure 2 it is shown, it illustrates the rotor brake dish of the fan fails brake unit of the present invention
A kind of embodiment of 1.Wherein, this rotor brake dish 1 is annular, and it has as friction
The lateral surface 300 in face, is also provided with for making frictional force increase on lateral surface 300
Projection, indenture or decorative pattern etc..The inner surface of rotor brake dish 1 is further equally arranged many
Individual toothed protrusion 301, by these toothed protrusion 301, this rotor brake dish 1 is permissible
Be connected on fan shaft 8, it will be understood that these toothed protrusion 301 can by pin or
The structures such as tongue-and-groove replace.It addition, along on the direction of engine axis 14, this rotor brake
The front end of dish 1 adjoins clutch shaft bearing roller 6, and its rear end is compressed by nut 15.
So, when electromotor is in normal condition, fan shaft 8 and fan blade 10 are around sending out
Motivation axis 14 rotates, and is delivered to the moment of flexure of shear pin 4 less than predetermined from fan blade 10
Moment.
When there is fan blade fracture, as it is shown on figure 3, what huge unbalanced load produced
It is far longer than the moment of flexure of predetermined moment of flexure to be delivered to shear pin 4 and make shear pin 4 cut off inefficacy, bearing
Supporting member 3 loses radial support effect in front end, and this moment of flexure must make the rotary shaft of fan shaft 8
Line bends, substantially from the rotoflector centered by engine axis 14 shown in Fig. 1 to
Rotating centered by rotation axis 100 shown in Fig. 3.The skew of the rotation axis of fan blade
Causing rotor brake dish 1 position to be moved, rotor brake dish 1 and stator brake disc 2 touch mill,
That is, the outer friction surface 300 of rotor brake dish 1 and the inner surface of stator brake disc 2 collides,
This greatly reduces the impact force of fan blade 10 and fancase 11, prevent more than one leaf
Sheet is damaged and continues to increase load, on the other hand, and the outer friction surface 300 of rotor brake dish 1
The frictional force produced with the inner surface of stator brake disc 2 is that fan shaft 8 deceleration provides brake force
Square, makes the rotating speed of fan shaft 8 constantly reduce.
As shown in Figure 4, after fan shaft 8 rotating speed is substantially reduced, it is curved that out-of-balance force produces
Square reduces accordingly, and fan shaft 8 returns to approximately to rotate from rotation centered by rotation axis 100
Rotating centered by axis 200, this rotation axis 200 is properly termed as the fan shaft rotation of windmill condition
Shaft axis.Now, rotor brake dish 1 disengages with stator brake disc 2, no longer produces brake force,
Electromotor enters windmill condition continuous running smoothly.
Although in the above-described embodiment, this stator brake disc 2 and bearing support 3 are one
Make, but those of ordinary skill in the art is it should be appreciated that this stator brake disc 2
Can also be separately fabricated independent of this bearing support 3.
Although it will be appreciated by those skilled in the art that described above is rotor brake dish 1 leads to
Crossing its toothed protrusion divides 301 to be connected on fan shaft 8, but other fixing connected mode
Also possible.
The present invention's is effective as follows:
Under FBO load, bearing support 3 and clutch shaft bearing assembly 16 disconnect, and then
After engine axis bending, as rotor brake dish 1 and the stator brake disc 2 of brake unit
Raw collision, limits maximum radial displacement and the deflection angle of the bending generation of fan shaft 8, this
Sample can reduce the bending load produced on the second bearing assembly and other structures.Fan blade
The maximum radial displacement of the maximum radial displacement of 10 and deflection angle and fan shaft 8 and deflection angle
Spend basically identical, within being limited in maximum license radial displacement, can prevent fan blade 10 with
Casing 11 produces bigger collision and gross distortion and clamping stagnation, thus prevents very big moment of torsion,
And then protection fan shaft 8 structure, it is also possible to prevent multiple blade from again rupturing and increasing imbalance
Load.On the other hand, the present invention has the effect reducing FBO load.Rotor brake dish and 1
After stator brake disc 2 touches mill, producing certain frictional force, bearing support structure is by brake force
Act on fan shaft 8 so that the rotating speed of fan shaft 8 reduces rapidly.Footpath on fan shaft 8
To square being directly proportional of unbalanced load and its rotating speed, the reduction of rotating speed reduces fan shaft not
Balancing load.
Fan blade 10 comes off moment, and the destruction producing engine structure is maximum, when passing through
Dangerous spot, the rotating speed of fan shaft 8 is substantially reduced, the degree of crook of fan shaft 8 is the most corresponding
Reduce so that rotor brake dish 1 and the stator brake disc 2 of brake unit disengage, and no longer produce
Frictional resistance, now electromotor enters windmill condition and even running.
The present invention is not in any way limited to the exemplary reality presented in the specification and illustrated in the drawings
Execute mode.All combinations of the embodiment (part) illustrated and describe are clearly understood that
For within being incorporated to this description and be clearly understood that as falling within the scope of the present invention.And,
In the scope of the present invention that such as claims are summarized, many variations is possible.Additionally,
Any reference marker in claims should be constructed as limiting the scope of the present invention.
Claims (12)
1. a fan fails brake unit for aero-engine, comprising:
Fan shaft, is provided with rotor brake dish；
Fan blade, it is arranged on described fan shaft, and described fan blade is relative to institute
State rotor brake dish on fluid flow direction, be positioned at upstream；
Bearing support, its one end is arranged on casing, and described bearing support is arranged
Having stator brake disc, described stator brake disc is circumferentially around described rotor brake dish also
It is radially spaced apart with described rotor brake dish；
Bearing assembly, its one end is couple on described fan shaft the other end with predetermined moment of flexure
It is connected on described bearing support；
It is characterized in that, when described fan blade ruptures, described fan shaft is the most inclined
Turning makes the Breaking bending moment between described bearing assembly and described bearing support exceed
During described predetermined moment of flexure, described bearing assembly and described bearing support be disconnected from
And described rotor brake dish engages with described stator brake disc.
Fan fails brake unit the most according to claim 1, it is characterised in that
Described stator brake disc is fixture, when rotor brake dish moves radially, is less than
Stator brake disc position.
Fan fails brake unit the most according to claim 1, it is characterised in that
The lateral surface of described rotor brake dish is rubbing surface, and the medial surface of stator brake disc is
Rubbing surface.
Fan fails brake unit the most according to claim 3, it is characterised in that
Include on described rubbing surface for increasing the projection of frictional force, indenture or decorative pattern.
Fan fails brake unit the most according to claim 1, it is characterised in that
Described bearing assembly and described bearing support connect with overload disabling elements.
Fan fails brake unit the most according to claim 5, it is characterised in that
Described overload disabling elements is shear pin or shears bolt.
Fan fails brake unit the most according to claim 1, it is characterised in that
The most described bearing assembly of described bearing support is at described fluid flow direction
Downstream is couple on described fan shaft with another bearing assembly.
Fan fails brake unit the most according to claim 1, it is characterised in that
Described rotor brake dish uses pin or tongue-and-groove to be fixedly attached on described fan shaft.
Fan fails brake unit the most according to claim 1, it is characterised in that
Described rotor brake dish uses profile of tooth to highlight structure and is fixedly attached on described fan shaft.
Fan fails brake unit the most according to claim 1, its feature exists
In, described bearing assembly includes outer race assembly, bearing inner ring assembly and can turn
It is arranged in the axle between described outer race assembly and described bearing inner ring assembly dynamicly
Bearing roller, wherein, described bearing inner ring assembly is connected on described fan shaft, described
Outer race assembly is connected on described bearing support.
11. fan fails brake units according to claim 5, its feature exists
In, the front end of described rotor brake dish adjoins bearing roller, and described fan shaft is adjacent
The rear end of described rotor brake dish is additionally provided with in described fluid flow direction phase
The nut of described rotor brake dish is compressed on anti-direction.
12. according to the fan fails brake unit according to any one of claim 1-11,
It is characterized in that, described stator brake disc itself is one, or described stator system
Moving plate and described bearing support are one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210413857.7A CN103775212B (en) | 2012-10-25 | 2012-10-25 | A kind of fan fails brake unit of aero-engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210413857.7A CN103775212B (en) | 2012-10-25 | 2012-10-25 | A kind of fan fails brake unit of aero-engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103775212A CN103775212A (en) | 2014-05-07 |
| CN103775212B true CN103775212B (en) | 2016-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210413857.7A Active CN103775212B (en) | 2012-10-25 | 2012-10-25 | A kind of fan fails brake unit of aero-engine |
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Cited By (1)
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| FR3129175A1 (en) * | 2021-11-15 | 2023-05-19 | Safran Aircraft Engines | TURBOMACHINE MODULE WITH AN AMPLITUDE LIMITING DEVICE AND CORRESPONDING TURBOMACHINE |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105756723B (en) * | 2014-12-15 | 2017-06-06 | 中航商用航空发动机有限责任公司 | A kind of active device for fusing, method and aero-engine |
| CN107227980B (en) * | 2016-03-24 | 2019-07-09 | 中国航发商用航空发动机有限责任公司 | Automatically adjust the Aero-engine Bearing supporting structure of rigidity |
| CN107237655B (en) * | 2016-03-28 | 2019-03-15 | 中国航发商用航空发动机有限责任公司 | Aero-engine and its fan blade fly off blowout method under load |
| CN107795384B (en) * | 2016-08-31 | 2019-10-11 | 中国航发商用航空发动机有限责任公司 | Disconnect device and aero-engine |
| FR3061242B1 (en) * | 2016-12-23 | 2019-05-17 | Safran Aircraft Engines | TURBOMACHINE COMPRISING A MEANS FOR DECOUPLING A BLOWER |
| CN113047959B (en) * | 2019-12-27 | 2022-07-12 | 中国航发商用航空发动机有限责任公司 | Aeroengine braking device and aeroengine |
| CN114526161B (en) * | 2022-04-22 | 2022-07-08 | 成都中科翼能科技有限公司 | Gas turbine's intermediary machine casket and reinforcement structure thereof |
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| GB2444935A (en) * | 2006-12-06 | 2008-06-25 | Rolls Royce Plc | Accommodating radial excursions of a turbofan gas turbine engine shaft |
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| US6098399A (en) * | 1997-02-15 | 2000-08-08 | Rolls-Royce Plc | Ducted fan gas turbine engine |
| US6402469B1 (en) * | 2000-10-20 | 2002-06-11 | General Electric Company | Fan decoupling fuse |
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| Publication number | Publication date |
|---|---|
| CN103775212A (en) | 2014-05-07 |
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Address after: 200241 Minhang District Lianhua Road, Shanghai, No. 3998 Patentee after: China Hangfa commercial aviation engine limited liability company Address before: 201109 Shanghai city Minhang District Hongmei Road No. 5696 Room 101 Patentee before: AVIC Commercial Aircraft Engine Co.,Ltd. |
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