CN106499728B - Turn the method for adjustment of stator component and its bias - Google Patents
Turn the method for adjustment of stator component and its bias Download PDFInfo
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- CN106499728B CN106499728B CN201510566424.9A CN201510566424A CN106499728B CN 106499728 B CN106499728 B CN 106499728B CN 201510566424 A CN201510566424 A CN 201510566424A CN 106499728 B CN106499728 B CN 106499728B
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Abstract
The present invention provides a kind of method of adjustment turning stator component and its bias, it is a test suite that the method for adjustment, which includes by outer race, concentric ring, bearing spider assembly, in test suite, the radial ring wall of concentric ring be located in resilient support, bearing spider radial anchor ring between, axial ring wall be folded in resilient support, bearing spider axial anchor ring between；The eccentricity and eccentric position of the inner surface of the test suite middle (center) bearing outer shroud are measured, and turns the settlement of support amount under stator consideration gravity in conjunction with this, the eccentricity for needing to process is obtained, is processed into eccentric hoop to choosing identical concentric ring accordingly；It is an assembling assembly by the assembly of outer race, eccentric hoop and bearing spider, and measures, adjusts eccentricity, until for the eccentricity of design.
Description
Technical field
The present invention relates to the methods of adjustment for turning stator component and its bias of aero-engine.
Background technology
Aero-engine is mainly made of the stator part of high-speed rotating rotor and supporting rotor, in its processing, assembly
In the course of work, engine turn, stator nonconcentricity can change in certain margin of tolerance, as a result, to complete machine oscillation
And the performance of engine has an impact.Turn, the optimization of stator nonconcentricity supports eccentricity by changing stator, and then reaches and turn
The target of nonconcentricity minimum between son and stator.The adjustment of existing stator bearing eccentricity is mainly adjusted by adding in bearing block
Bearing block is directly processed into bias by a whole set of cylinder, and settlement of support caused by the two methods are conducted oneself with dignity mainly for rotor generates
The stator bias that turns on vertical direction is adjusted, on other directions not to processing, assembling generation turn stator bias into
Row adjustment.
Invention content
The purpose of the present invention is to provide a kind of methods of adjustment turning stator component and its bias.
A kind of method of adjustment turning stator component bias comprising
Step 1: providing bearing bullet branch device, the bearing bullet branch device includes bearing inner ring and outer race, the axis
It holds and is bonded to resilient support on outer shroud, the bearing inner ring is for accepting rotor；
Step 2: providing bearing spider, the bearing spider is for being installed on stator；
Step 3: providing concentric ring, the concentric ring has axial ring wall and radial ring wall；
Step 4: being a test suite by the outer race, the concentric ring, bearing spider assembly, in institute
State in test suite, it is described radial direction ring wall be located in it is described resilient support, the bearing spider radial anchor ring between, the axis
To ring wall be folded in it is described resilient support, the bearing spider axial anchor ring between, and respectively with it is described resilient support, it is described
The axial anchor ring of bearing spider is fastened by fastener, passes through the through-hole of the radial ring wall by the bullet by fastener
Property support, the concentric ring, the bearing spider fastening；
Step 5: measuring the eccentricity and eccentric position of the inner surface of outer race described in the test suite；
Step 6: according to the eccentricity, the eccentric position measured, and turn stator in conjunction with this and consider under gravity
Settlement of support amount obtains the eccentricity for needing to process, and is processed into eccentric hoop to choosing identical concentric ring, the processing to concentric ring
It is to process the eccentricity for needing to process on the surface with the spring-loaded contact of the axial ring wall；And
Step 7: being an assembling assembly by the assembly of the outer race, the eccentric hoop and the bearing spider, measuring should
The eccentricity of outer race inner surface described in assembling assembly, be then rotated further by adjust the axial ring wall of the eccentric hoop with it is described
The eccentricity of the position of bullet branch side wall contact, the outer race inner surface described in the assembling assembly be the eccentricity designed.
In a preferred embodiment, in the step 7, the outer race, described is fixed with part fasteners first
Then eccentric hoop and the bearing spider adjust the eccentricity of the outer race inner surface again, until the bias that it is design
Then amount fixes the outer race, the eccentric hoop and the bearing spider with whole fastener again.
In a preferred embodiment, in step 4, which is fixed together with turntable, rotates the turntable
Model rotor rotates, then moves the indicator that the measurement table bar on special tooling makes the dial gauge/amesdial being fixed on table bar
It can be contacted with the inner surface of the outer race, and the fixed measurement table bar；In rotating the turntable for the first time, survey is checked
Whether scale all contacts with outer race, however the position of measurement table is scheduled on engine along 12 o'clock position right over course
It sets, and this point is set to " 1 " number position, while measurement table being returned to zero, second of rotor measures the interior table of the outer race
The eccentricity of uniformly distributed 8 points in face simultaneously records numerical value, and according to the numerical value of record, the inner surface of the outer race is calculated
Maximum eccentricity amount and corresponding position.
In a preferred embodiment, in step 7, to the lateral of outer race inner surface, radial direction and tilted direction into
The eccentric adjustment of row.
In a preferred embodiment, in the test suite or assembling assembly, the resilient support is sleeved on described concentric
The outside of the radial ring wall of ring or eccentric hoop.
In a preferred embodiment, in the test suite or assembling assembly, the resilient support is enclosed in described same
The inside of the radial ring wall of thimble or eccentric hoop.
A kind of adjusting apparatus turning stator component bias includes：Bearing bullet branch device, bearing spider and eccentric hoop, bearing
Bullet branch device includes bearing inner ring and outer race, and resilient support is bonded on the outer race, and the bearing inner ring is used for
Accept rotor；Bearing spider is for being installed on stator；Eccentric hoop has axial ring wall and radial ring wall；Wherein, described
Outer race, the eccentric hoop, bearing spider assembly are an assembling assembly, in the assembling assembly, the radial direction
Ring wall be located in it is described resilient support, the bearing spider radial anchor ring between, it is described axial direction ring wall be folded in the elasticity
Support, the bearing spider axial anchor ring between, and respectively with it is described resilient support, the bearing spider the axial rings
Face clearance fit passes through the through-hole of the radial ring wall by the resilient support, the concentric ring, the bearing by fastener
Bearing fastens；The radial direction ring wall is interior table to the outer race with the eccentricity on the surface of the spring-loaded contact
The eccentricity in face, this turn stator consider gravity under settlement of support amount complementation so that it is concentric to turn stator component.
In a preferred embodiment, the outside for flexibly supporting the radial ring wall for being sleeved on the eccentric hoop.
In a preferred embodiment, the inside for flexibly supporting the radial ring wall for being enclosed in the eccentric hoop.
In an embodiment of the present invention, by concentric ring pre-assembled bearing outer ring and bearing spider and measure assembling after survey
The concentricity of component is tried, can get the eccentricity that every engine is supported by the stator that processing, build-up tolerance are brought, and according to this
Settlement of support amount processing caused by a eccentricity combination rotor dead weight is suitble to the mach concentric ring of bias of this engine
Axial ring wall, the eccentric hoop of eccentric adjustment can be carried out by obtaining, so as to improve global vibration of engine characteristic and performance, while the party
Method only increases an eccentric shaped part to the structural modification very little of engine itself, and structure type is simple.
In an embodiment of the present invention, eccentric hoop is the axially symmetric structure of L-type, and structure type is simple, axial ring wall, radial direction
The thickness of ring wall is small, occupies little space；Only need to be between resilient support and bearing spider in structure design it is radial and axial
Physical space is left with closing, it is small to adjacent structural modification.
Description of the drawings
The above and other features of the present invention, property and advantage will pass through retouching with reference to the accompanying drawings and examples
It states and becomes readily apparent from, wherein：
Fig. 1 is the schematic diagram of one embodiment of the invention transfer stator component；
Fig. 2 is the decomposition view of quiet rotor assembly in Fig. 1；
Fig. 3 is the enlarged view of eccentric hoop installation site in Fig. 1；
Fig. 4 is the enlarged view of eccentric hoop installation site in another implementation of the present invention；
Fig. 5 is the schematic diagram of the misalignment measurement of rotor in one embodiment of the invention；
Fig. 6 is the schematic diagram of eccentric hoop in one embodiment of the invention；
Fig. 7 is the schematic diagram of eccentric hoop in another embodiment of the present invention.
Specific implementation mode
With reference to specific embodiments and the drawings, the invention will be further described, elaborates in the following description more
Details to facilitate a thorough understanding of the present invention, still the present invention obviously can be come with a variety of other manners different from this description it is real
It applies, those skilled in the art can make similar popularization according to practical situations without violating the connotation of the present invention, drill
It unravels silk, therefore should not be limited the scope of the invention with the content of this specific embodiment.
Fig. 1, Fig. 2, Fig. 3, Fig. 4 show the schematic diagram of quiet rotor assembly in one embodiment of the invention.It should be noted that
These and follow-up other attached drawing, and should not only as an example, it is drawn according to the condition of equal proportion
It is construed as limiting in this, as the protection domain to actual requirement of the present invention.
As shown in Figure 1 to Figure 3, the off-center adjustment apparatus for turning stator component include bearing bullet branch device 2, bearing spider 3 with
And eccentric hoop 4, bearing bullet branch device 2 include bearing inner ring 24 and outer race 25, and resilient support is bonded on outer race 25
26.The seperated part that resilient support 26 can be integrated or link together with outer race 25.Bearing inner ring 24 is for accepting
Shaft 1.Bearing spider 3 is for being installed on stator.Eccentric hoop 4 has radial ring wall 41 and axial ring wall 42.Axial, diameter
It is reference to being to turn the design centre axis of stator, the direction for being roughly parallel to design centre axis is axial direction, substantially vertical
It is radial in the direction of design centre axis.The radial direction of the substantially quiet rotor of the extending direction of radial ring wall 41, axial ring wall 42
The substantially quiet rotor of extending direction axial direction.Radial ring wall 41 is folded in the radial anchor ring 260 of resilient support 26, bearing spider
Between 3 radial anchor ring 31, in other words radial ring wall 41 be sleeved on the radial anchor ring 260 of resilient support 26, support carriers 3 radial direction
Between anchor ring 31.Axial ring wall 42 is located between the axial anchor ring 32 of the axial anchor ring 261 of resilient support 26, bearing spider 3,
And respectively with resilient support 26 axial anchor ring 261, bearing spider 3 32 clearance fit of axial anchor ring, passed through by fastener 8
The through-hole of radial ring wall 41 will flexibly support 26, eccentric hoop 4, bearing spider 3 fastens.
As shown in fig. 7, it is provided with through-hole 43 on the radial ring wall 41 of eccentric hoop 4, and for being passed through for fastener 8, fastener 8
It can be high-precision bolt.261 gap of axial anchor ring of the outer surface 421 of the axial ring wall 42 of eccentric hoop 4 and resilient support 26
Cooperation, outer surface 421 are by machining the surface formed, the bias for adjusting 25 inner surface of outer race as described later.
32 clearance fit of axial anchor ring that the inner surface 420 of the axial ring wall 42 of eccentric hoop 4 is used to provide with bearing spider 3.In the figure 7
Axis L1 is the axle center of anchor ring 421, and axis L2 is the axle center of anchor ring 420.
As shown in Figure 4 and Figure 6, in another embodiment of the invention, the inner surface 421 of the axial ring wall 42 of eccentric hoop 4
With 261 clearance fit of axial anchor ring of resilient support 26, the outer surface 420 of axial ring wall 42 and the axial anchor ring of bearing spider 3
32 clearance fits, the i.e. axial ring wall 42 of eccentric hoop 4 are sleeved on the outside of the axial anchor ring 261 of resilient support 26 and are placed in axis
Hold 32 inside of axial anchor ring of bearing 3.At this point, the inner surface 421 of axial ring wall 42 is the surface that machining is formed, for adjusting
The bias of 25 inner surface of outer race.In figure 6, axis L1 is the axle center of anchor ring 421, and axis L2 is the axle center of anchor ring 420.
As shown in Figure 1, load caused by 1 gravity of shaft is transmitted to outer race 25 by bearing inner ring 24, then it is transmitted to
Resilient support 26, then it is transmitted to bearing spider 3 via eccentric hoop 4.If without eccentric hoop 4, turning the bias one of stator component is
Due to turning in the processing of stator component, assembling process, the rotor of engine, stator nonconcentricity can be in certain margins of tolerance
Variation；Another reason is to conduct oneself with dignity to generate bearing pivot sinking because of rotor.Eccentric hoop 4 can overcome the adjusting of these factors to turn stator
Bias.The off-center adjustment apparatus is only adjusted with an eccentric hoop, is the axially symmetric structure of L-type, and structure type is simple；
Axial ring wall, radial ring wall thickness generally take in 5~10mm, occupy little space；It need to only flexibly supported in structure design
Radial and axial between bearing spider leaves physical space with closing, small to adjacent structural modification.
In conjunction with Fig. 1 to Fig. 7, an embodiment of the method for adjustment according to the present invention for turning stator component bias is described below,
Wherein, Step 1: providing bearing bullet branch device 2.In step 2, bearing spider 3 is provided.In step 3, concentric ring is provided,
Concentric ring is not shown in figure, and can be understood by means of Fig. 6 or shown in Fig. 7 eccentric hoops, in anchor ring 421, Fig. 7 of Fig. 6
In anchor ring 421 without before being processed bias to adapt to turn stator, even increasing the part for being machined removing, exactly scheming
6, shown in Fig. 7 can be concentric ring.I.e. concentric ring with eccentric hoop 4 the difference is that with resilient support 26 axial direction
The face that anchor ring 261 coordinates is different, and the mating surface of concentric ring is concentric anchor ring, and the mating surface of eccentric hoop 4 is eccentric anchor ring.
It is a test suite to assemble outer race 25, the concentric ring, bearing spider 3 in step 4, such as Fig. 5 institutes
Show, assembly method is as shown in Fig. 3 and Fig. 4, the axial anchor ring and bearing branch of the axial ring wall chuck of concentric ring in resilient support
Between the axial anchor ring of seat；
The eccentricity and eccentric position of the inner surface of the test suite middle (center) bearing outer shroud 25 are measured in step 5, are measured
Method can be that the test suite and turntable 5 are fixed together again, rotation 5 model rotor of sabot rotation, then move special tool
It fills the measurement table bar 7 on 6 and allows the indicator and 25 inner surface of outer race of the dial gauge or amesdial that are fixed on table bar
Contact, fixation table bar 7.First time rotary turnplate 5, checks whether measurement table all contacts with outer race 25.It will finally measure
The position of table bar 7 is scheduled on engine along 12 o'clock position right over course, and this point is set to " 1 " number position, while by measurement table
Zeroing.Second of rotary turnplate 5 measures uniformly distributed 8 points of eccentricity on the inner surface of outer race 25 and records numerical value, according to note
The maximum eccentricity amount of outer race 25 and corresponding position is calculated in the numerical value of record.Test suite is split after being measured.
According to the eccentricity, the eccentric position measured in step 6, and engages this and turn stator consideration gravity
Under settlement of support amount, obtain needing the eccentricity processed, eccentric hoop be processed into choosing identical concentric ring, to concentric ring
Processing is to process the needs on the surface of axial ring wall 42 contacted with the axial anchor ring 261 of resilient support 26 to process
Eccentricity, in the embodiment shown in fig. 6, the surface are the corresponding concentric ring surface of inner surface 421, implementation shown in Fig. 7
In example, which is the corresponding concentric ring surface in outer surface 421.
It is an assembling assembly by the assembly of outer race 25, eccentric hoop 4 and bearing spider 3 in step 7, as shown in figure 5,
The eccentricity for measuring 25 inner surface of assembling assembly middle (center) bearing outer shroud, be then rotated further by adjustment eccentric hoop 4 axial ring wall 42 with
The position that the axial anchor ring 261 of resilient support 26 contacts, until the eccentricity of the inner surface of the component middle (center) bearing outer shroud 4 is design
Eccentricity.In a preferred embodiment, it after being fixed assembling assembly and turntable 5 using part fasteners, rotates for the first time
Turntable 5, the eccentricity for measuring the inner surface of outer race 4 record uniformly distributed 8 points of numerical value simultaneously, further according to numerical value then
Adjustment eccentric hoop 4 position until until qualified, then remaining fastener is all installed in place, again rotary turnplate 5, reading
The numerical value for taking measurement table bar 7, checks whether consistent with previously measured end value, or whether can also meet design after there is deviation
Eccentricity requirement, this work is completed if meeting, and is not met such as, is then unclamped all fasteners and readjust eccentric hoop
Position, re-adjustments work, until last numerical value meets technical requirement on design.
In method of adjustment above-mentioned, the eccentricity for adjusting the inner ring of outer race 25 is not meant to the bias of bearing being classified as
0, but according to the influence of actual conditions and gravity under working rotor state, outer race 25 is adjusted in the assembled condition in advance
Save into bias.The rotor eccentricity caused by under the influence of rotor is conducted oneself with dignity is in 25 concentric line of outer race hereinafter, therefore ordinary circumstance
To move up the bias of outer race 25, but eccentricity very little, working rotor state lower bearing outer shroud 25 it is upward partially
The heart makes rotor fulcrum float, and achievees the purpose that concentric will be adjusted at rotor fulcrum.
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this field skill
Art personnel without departing from the spirit and scope of the present invention, can make possible variation and modification.Therefore, it is every without departing from
The content of technical solution of the present invention, according to the technical essence of the invention to any modification, equivalent variations made by above example
And modification, it each falls within the protection domain that the claims in the present invention are defined.
Claims (9)
1. the method for adjustment of turn stator component bias, it is characterised in that including
Step 1: providing bearing bullet branch device, the bearing bullet branch device includes bearing inner ring and outer race, outside the bearing
Resilient support is bonded on ring, the bearing inner ring is for accepting rotor；
Step 2: providing bearing spider, the bearing spider is for being installed on stator；
Step 3: providing concentric ring, the concentric ring has axial ring wall and radial ring wall；
Step 4: being a test suite by the outer race, the concentric ring, bearing spider assembly, in the survey
Try component in, it is described radial direction ring wall be located in it is described resilient support, the bearing spider radial anchor ring between, the axial rings
Wall be folded in it is described resilient support, the bearing spider axial anchor ring between, and respectively with it is described resilient support, the bearing
The axial anchor ring clearance fit of bearing passes through the through-hole of the radial ring wall by the resilient support, institute by fastener
State concentric ring, bearing spider fastening；
Step 5: measuring the eccentricity and eccentric position of the inner surface of outer race described in the test suite；
Step 6: according to the eccentricity, the eccentric position measured, and this is combined to turn the fulcrum under stator consideration gravity
Deflection obtains needing the eccentricity processed, and eccentric hoop is processed into choosing identical concentric ring, the processing to concentric ring be
The eccentricity for needing to process is processed on the surface with the spring-loaded contact of the radial direction ring wall；And
Step 7: being an assembling assembly by the assembly of the outer race, the eccentric hoop and the bearing spider, the assembly is measured
Then the eccentricity of outer race inner surface described in component is rotated further by the axial ring wall for adjusting the eccentric hoop and the elasticity
The eccentricity of the position of the side wall contact of support, the outer race inner surface described in the assembling assembly be the bias designed
Amount.
2. the method for adjustment as claimed in claim 1, which is characterized in that in step 7, fix institute with part fasteners first
Outer race, the eccentric hoop and the bearing spider are stated, and measures the eccentricity of the outer race inner surface, according to measurement
As a result, adjust the eccentricity of the outer race inner surface, until the eccentricity that it is design, then use whole fasteners again
The fixed outer race, the eccentric hoop and the bearing spider.
3. the method for adjustment as claimed in claim 1, which is characterized in that in step 4, which is fixed with turntable
Together, the dishpan simulation rotor rotation is rotated, then the measurement table bar moved on special tooling to be fixed on table bar
The indicator of dial gauge/amesdial is contacted with the inner surface of the outer race, and the fixed measurement table bar；It is rotated in first time
The turntable, checks whether measurement table all contacts with outer race, however the position of measurement table is scheduled on engine along course
12 o'clock of surface position, and this point is set to " 1 " number position, while measurement table being returned to zero, second of rotor, described in measurement
The eccentricity of uniformly distributed 8 points of the inner surface of outer race simultaneously records numerical value, and according to the numerical value of record, the bearing is calculated
The maximum eccentricity amount of the inner surface of outer shroud and corresponding position.
4. the method for adjustment as claimed in claim 1, which is characterized in that in step 7, to the outer race inner surface
Lateral, vertical and tilted direction carries out eccentric adjustment.
5. the method for adjustment as claimed in claim 1, which is characterized in that in the test suite or assembling assembly, the bullet
Property supporting sleeve is in the outside of the concentric ring or the radial ring wall of eccentric hoop.
6. the method for adjustment as claimed in claim 1, which is characterized in that in the test suite or assembling assembly, the bullet
Property support be enclosed in the concentric ring or eccentric hoop radial ring wall inside.
7. the adjusting apparatus of turn stator component bias, it is characterised in that including：
Bearing bullet branch device, including bearing inner ring and outer race are bonded to resilient support, the bearing on the outer race
Inner ring is for accepting rotor；
Bearing spider, for being installed on stator；And
Eccentric hoop has axial ring wall and radial ring wall；
Wherein, the outer race, the eccentric hoop, bearing spider assembly are an assembling assembly, in the assembly group
In part, it is described radial direction ring wall be located in it is described resilient support, the bearing spider radial anchor ring between, it is described axial direction ring wall folder
Be located at it is described resilient support, the bearing spider axial anchor ring between, and respectively with it is described resilient support, the bearing spider
The axial anchor ring clearance fit, by fastener pass through the through-hole of the radial ring wall by the resilient support, it is described partially
Thimble, bearing spider fastening；The radial direction ring wall is to described with the eccentricity on the surface of the spring-loaded contact
The eccentricity of the inner surface of outer race, this turn stator consider gravity under settlement of support amount complementation, so as to turn stator
Component is concentric.
8. the adjusting apparatus as claimed in claim 7, which is characterized in that in assembling assembly, the resilient support is sleeved on described
The outside of the radial ring wall of eccentric hoop.
9. the adjusting apparatus as claimed in claim 7, which is characterized in that in assembling assembly, the resilient support is enclosed in institute
State the inside of the radial ring wall of eccentric hoop.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510566424.9A CN106499728B (en) | 2015-09-08 | 2015-09-08 | Turn the method for adjustment of stator component and its bias |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510566424.9A CN106499728B (en) | 2015-09-08 | 2015-09-08 | Turn the method for adjustment of stator component and its bias |
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| CN106499728A CN106499728A (en) | 2017-03-15 |
| CN106499728B true CN106499728B (en) | 2018-10-30 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109514465B (en) * | 2018-11-29 | 2021-07-16 | 中国航发沈阳黎明航空发动机有限责任公司 | Long-shaft component assembly guiding clamp and using method |
| CN110631540A (en) * | 2019-10-11 | 2019-12-31 | 中国航发沈阳发动机研究所 | Method for calculating eccentricity of supporting point eccentric bushing of aero-engine |
| CN113074680B (en) * | 2020-01-06 | 2023-01-20 | 中国航发商用航空发动机有限责任公司 | Device and method for measuring axial maximum play amount of rotor |
| CN115949670B (en) * | 2023-03-09 | 2023-06-30 | 中国航发四川燃气涡轮研究院 | Elastic structure for axial compression of bearing |
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|---|---|---|---|---|
| CN101858353A (en) * | 2010-06-03 | 2010-10-13 | 浙江大学 | Controllable whirling device for centrifugal pump |
| CN102185412A (en) * | 2011-05-23 | 2011-09-14 | 南车株洲电机有限公司 | High-power traction motor bearing installation and lubrication method and device |
| CN102979856A (en) * | 2012-11-17 | 2013-03-20 | 吴小杰 | Bearing-grease lubricating wind-power conical and cycloidal yawing speed reducer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011085831A1 (en) * | 2010-01-14 | 2011-07-21 | Koenig & Bauer Aktiengesellschaft | Device for bearing one or more cylinders of a printing press |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858353A (en) * | 2010-06-03 | 2010-10-13 | 浙江大学 | Controllable whirling device for centrifugal pump |
| CN102185412A (en) * | 2011-05-23 | 2011-09-14 | 南车株洲电机有限公司 | High-power traction motor bearing installation and lubrication method and device |
| CN102979856A (en) * | 2012-11-17 | 2013-03-20 | 吴小杰 | Bearing-grease lubricating wind-power conical and cycloidal yawing speed reducer |
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