CN112443573A - Three-row cylindrical roller variable pitch bearing with wind generating set independently variable pitch - Google Patents
Three-row cylindrical roller variable pitch bearing with wind generating set independently variable pitch Download PDFInfo
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- CN112443573A CN112443573A CN202011406417.XA CN202011406417A CN112443573A CN 112443573 A CN112443573 A CN 112443573A CN 202011406417 A CN202011406417 A CN 202011406417A CN 112443573 A CN112443573 A CN 112443573A
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- Prior art keywords
- roller
- radial
- axial
- bearing
- outer ring
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
- F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
- F16C33/48—Cages for rollers or needles for multiple rows of rollers or needles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/583—Details of specific parts of races
Abstract
The invention discloses a three-row cylindrical roller variable pitch bearing of an independent variable pitch of a wind generating set, which comprises an inner ring and an outer ring, wherein two rows of axial rollers bearing axial force and one row of radial rollers bearing radial force are arranged between the inner ring and the outer ring, the axial rollers and the radial rollers are arranged between the inner ring and the outer ring in an interference fit manner, and the interference magnitude of the axial rollers is larger than that of the radial rollers.
Description
Technical Field
The invention belongs to the technical field of wind power bearing design, and particularly relates to a three-row cylindrical roller variable pitch bearing with independent variable pitch of a wind generating set.
Background
With the rapid development of economic construction in China, the influence of electric energy on economic construction and life of people is larger and larger, and wind power generation is more and more emphasized by people as one of various power generation modes. In order to improve the power generation efficiency, a wind power plant is generally built outdoors with rich wind resources, and the conversion of wind energy into electric energy is realized by using a wind power generation device and a wind power generator set.
In the working process of the wind driven generator, because the wind speed of natural wind is constantly changed, if the state of the blades of the wind driven generator set is constantly unchanged, the input rotating speed is inevitably constantly changed, and the quality of generated energy is further influenced; in order to ensure that the acting force of wind on the blades is basically unchanged and further ensure that the input rotating speed is basically constant, the windward angle of the blades of the wind generating set needs to be changed according to the wind speed, however, because the number of the blades is three, when the windward angle of the blades is changed, the existing working mode adopts synchronous pitch control, namely, the three blades rotate synchronously to realize the change of the windward angle, and the working mode also has certain defects, which mainly reflects that the wind power on each blade is different due to the influence of turbulence, wind direction and the position of the blade, and the integral stress imbalance and stress overload of the fan can be caused even after the blades are synchronously changed, so that the maximum power generation efficiency can not be reached.
In addition, when current aerogenerator's blade is rotatory, mainly realize rotating through the effect of becoming the oar bearing, and the rolling element that current becomes the oar bearing is the steel ball, the steel ball is located the circular arc channel between the interior outer lane of bearing, however, there is certain clearance between the steel ball and the circular arc channel that interior outer lane formed, this clearance can make the bearing produce the rocking of certain degree at the during operation, and the steel ball is as the rolling element, can appear not enough in rigidity at the during operation, the shortcoming that bearing capacity is little, lead to becoming the reduction of oar bearing life.
Disclosure of Invention
In order to solve the technical problems, the invention provides the three-row cylindrical roller variable pitch bearing of the wind generating set for independently changing the pitch, the three-row cylindrical roller variable pitch bearing adopts three rows of cylindrical rollers as rolling bodies, has the advantages of high bearing capacity and high rigidity, can realize independent pitch change when three variable pitch bearings of the wind generating set work, is beneficial to the balance of a fan structure, can avoid the problem of overload stress of fan blades, and improves the generating efficiency.
The technical scheme adopted by the invention is as follows: the three-row cylindrical roller variable pitch bearing for the independent variable pitch of the wind generating set comprises an inner ring and an outer ring, wherein two rows of axial rollers bearing axial force and one row of radial rollers bearing radial force are arranged between the inner ring and the outer ring, the axial rollers and the radial rollers are arranged between the inner ring and the outer ring in an interference fit mode, and the interference magnitude of the axial rollers is larger than that of the radial rollers.
The axial clearance value of the axial roller is-0.1 to-0.15 mm, and the radial clearance value of the radial roller is-0.06 to-0.1 mm.
The outer ring comprises a first outer ring and a second outer ring, and the first outer ring is connected with the second outer ring through a connecting bolt.
The radial roller bearing is characterized in that a radial retainer is arranged in a cavity where the radial roller is located, a plurality of first pocket holes which are uniformly distributed around the center of the radial retainer and used for mounting the radial roller are formed in the circumferential direction of the radial retainer, each first pocket hole at the circumferential position of the radial retainer comprises a first end inner wall and two corresponding first side inner walls, each first side inner wall comprises a first straight-through section and a first arc section, the distance between the two first straight-through sections of each first pocket hole is larger than the minimum distance between the two first arc sections, a first shrinkage part convenient for limiting the radial roller after being mounted is arranged at the junction of the first straight-through section and the first arc section of each first side inner wall, and the positions of the first side inner walls of the two adjacent first pocket holes are opposite.
The axial roller bearing is characterized in that an axial retainer is arranged in a cavity where the axial roller is located, a plurality of pocket holes II which are uniformly distributed around the center of the axial retainer and used for mounting the axial roller are formed in the axial retainer in the thickness direction of the axial retainer, each pocket hole II comprises two end inner walls II which are parallel to each other and two corresponding side inner walls II, each side inner wall II comprises a direct section II and an arc section II, the distance between the two direct sections II of each pocket hole II is larger than the minimum distance between the two arc sections II, a contraction amount part II which is convenient for limiting after the axial roller is mounted is arranged at the junction of the direct section II of each side inner wall II and the arc section II, and the two side inner walls of the two adjacent pocket holes II are opposite in position.
And sealing rings are arranged at the upper position and the lower position of the joint of the inner ring and the outer ring.
The axial roller and the radial roller are both cylindrical rollers.
The three-row cylindrical roller variable pitch bearing of the wind generating set for independently changing the pitch utilizes the three-row cylindrical roller bearing to replace a traditional spherical bearing to be used as the variable pitch bearing, the bearing capacity of the variable pitch bearing is increased, the installation clearance of the axial roller and the radial roller is set to be a negative value, the absolute value of the axial negative clearance value is greater than the absolute value of the radial negative clearance value, the two rows of axial rollers can bear overturning moment when the variable pitch bearing works, the radial roller is prevented from being damaged due to the fact that the radial roller bears the overturning moment, and the three-row cylindrical roller variable pitch bearing has the advantages of being large in bearing capacity, high in rigidity and long in service life; in addition, when the fan blade rotating device works, the variable pitch bearing is installed at the position of a fan blade, and when the fan blade rotates, three motors and the control system are adopted to control the three blades respectively, so that the traditional synchronous variable pitch becomes independent variable pitch, the fan can stably operate under different working conditions, the phenomenon of overload of the fan blade is avoided, and the generation efficiency of the fan is improved.
The axial roller and the radial roller are arranged between the inner ring and the outer ring in an interference fit manner, and the interference magnitude of the axial roller is greater than that of the radial roller; the purpose of this is: the structure that the traditional pitch bearing adopts the steel ball is changed into a three-row cylindrical roller type structure, the traditional positive clearance is changed into the negative clearance, the rigidity and the bearing capacity of the pitch bearing are favorably improved, the interference magnitude of the axial rollers is larger than the excessive hardness of the radial rollers, the two rows of axial rollers are used as bearing pieces when the pitch bearing bears the overturning moment, and therefore the radial rollers are prevented from being damaged by the overturning moment to generate the bearing, and the service life of the bearing is favorably prolonged.
The invention has the beneficial effects that:
the three-row cylindrical roller type wind driven generator has the advantages of being simple in design structure and convenient to use, adopting the three rows of cylindrical rollers as rolling bodies, being high in bearing capacity and rigidity, and three variable-pitch bearings of the wind driven generator can realize independent variable pitch during working, so that balance of a fan structure is facilitated, the problem of stress overload of fan blades can be avoided, and power generation efficiency is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a perspective view of the radial cage of the present invention;
FIG. 3 is a perspective view of the pocket of the radial cage of the present invention
FIG. 4 is a cross-sectional view of the radial cage of the present invention;
FIG. 5 is an enlarged partial view of the radial cage of the present invention;
FIG. 6 is a plan view of the axial cage of the present invention;
FIG. 7 is an enlarged partial view of the axial cage of the present invention;
FIG. 8 is a cross-sectional view of the axial cage of the present invention;
fig. 9 is an enlarged partial cross-sectional view of the axial cage of the present invention.
The labels in the figure are: 1. an inner ring; 2. a seal ring; 3. an axial roller; 4. an axial cage; 41. a second pocket hole; 411. a second end inner wall; 412. a second side inner wall; 4121. a straight-through section II; 4122. a second arc section; 4123. a second reduction part; 5. a first outer race; 6. a radial roller; 7. a radial cage; 71. a first pocket hole; 711. a first end inner wall; 712. a first side inner wall; 7121. a first straight-through section; 7122. a first arc section; 7123. a first reduction part; 8. a second outer race; 9. and connecting the bolts.
Detailed Description
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings.
As shown in the figure, the three-row cylindrical roller variable pitch bearing of the wind generating set independently changes the pitch comprises an inner ring 1 and an outer ring, two rows of axial rollers 3 bearing axial force and one row of radial rollers 6 bearing radial force are arranged between the inner ring 1 and the outer ring, the axial rollers 3 and the radial rollers 6 are both installed between the inner ring 1 and the outer ring in an interference fit mode, and the interference magnitude of the axial rollers 3 is larger than that of the radial rollers 6.
The axial clearance value of the axial roller 3 is-0.1 to-0.15 mm, the radial clearance value of the radial roller 6 is-0.06 to-0.1 mm, and the clearance values are set in the range, so that the purpose is to adopt negative clearance to assemble the bearing roller, the roller can be prevented from shaking in the bearing to a certain degree, and the rigidity and the bearing capacity of the bearing are improved; the second purpose is to ensure that the absolute value of the axial clearance value is larger than the absolute value of the radial clearance value, so that the radial roller 6 cannot be damaged by the overturning moment when the variable-pitch bearing is subjected to the overturning moment, and the service life of the bearing is prolonged; the third purpose is that the play value is set in the range, so that the operation of the bearing can be better facilitated, when the play value is larger than the range, namely the interference is too large, the roller cannot rotate in the bearing, and when the play value is smaller than the range, the rigidity of the roller and the bearing cannot meet the use requirement, so that the service life of the bearing is reduced; the service life of the three-row cylindrical roller variable pitch bearing arranged in the range is more than 20 years.
The outer ring comprises a first outer ring 5 and a second outer ring 8, the first outer ring 5 is connected with the second outer ring 8 through a connecting bolt 9, the arrangement is convenient for assembling the bearing, during specific assembly, the second outer ring 8 is placed on a horizontal workbench or the ground, the axial rollers 3 and the axial retainers 4 below are placed on steps of the second outer ring 8, then the inner ring 1 is placed above the axial rollers 3, the radial rollers 6, the radial retainers 7, the axial rollers 3 and the axial retainers 4 are respectively placed on the steps, finally, the first outer ring 5 is heated to 70-80 ℃, the temperature is kept for two hours, the second outer ring 8 is connected with the first outer ring 5, and the whole assembly process is completed after cooling.
The radial roller bearing is characterized in that a radial retainer 7 is arranged in a cavity where the radial roller 6 is located, a plurality of pockets 71 which are uniformly distributed around the center of the radial retainer 7 and used for mounting the radial roller 6 are formed in the circumferential direction of the radial retainer 7, each pocket 71 at the circumferential position of the radial retainer 7 comprises two end inner walls 711 which are parallel to each other and two corresponding side inner walls 712, each side inner wall 712 comprises a straight-through section 7121 and an arc section 7122, the distance between the two straight-through sections 7121 of the single pocket 71 is larger than the minimum distance between the two arc sections 7122, a shrinkage part 7123 which is convenient for limiting the radial roller 6 after being mounted is arranged at the junction of the straight-through section 7121 of the side inner wall 712 and the arc section 7122, and the positions of the side inner walls 712 of the two adjacent pockets 71 are opposite.
Specifically, the first straight-through section 7121 is used as an initial end for installing the radial roller 6, the first arc section 7122 is used as a limiting end, namely after the radial roller 6 is installed in the first pocket hole 71, the first arc section 7122 of the first side inner wall 712 is in contact with the outer wall of the radial roller 6 and limits the radial roller 6 to fall off, so that the limiting purpose is achieved, in addition, the first pocket hole 71 is of a staggered distributed structure, so that the suspension purpose is achieved when the radial retainer 7 is assembled in a bearing, and the contact between the radial retainer 7 and an inner gear ring and an outer ring is avoided, so that friction is caused.
At the initial stage of installing the radial roller 6 in the radial cage 7, the radial roller 6 can be limited from falling towards the direction of the through section 7121 of the pocket I71 through the shrinkage part 7123, the purpose of limiting is achieved, and in addition, the other moving direction of the radial roller 6 is limited by the arc section 7122 of the pocket I71, so that the radial roller 6 is stably installed in the radial cage 7, an integral structure is formed, and the assembly of the bearing is facilitated.
The cavity where the axial roller 3 is located is internally provided with an axial retainer 4, the axial retainer 4 is provided with a plurality of pockets two 41 which are uniformly distributed around the center of the axial retainer 4 in the thickness direction and used for mounting the axial roller 3, each pocket two 41 comprises two end inner walls two 411 which are parallel to each other and two corresponding side inner walls two 412, each side inner wall two 412 comprises a through section two 4121 and an arc section two 4122, the distance between the two through sections two 4121 of a single pocket two 41 is larger than the minimum distance between the two arc sections two 4122, a shrinkage part two 4123 which is convenient for limiting after the axial roller 3 is mounted is arranged at the junction of the through section two 4121 of the side inner wall two 412 and the arc section two 4122, and the positions of the side inner walls two 412 of the two adjacent pockets 41 are opposite.
Specifically, the second through section 4121 is used as an initial end for installing the thrust roller, the second arc section 4122 is used as a limiting end, namely, after the thrust roller is installed in the second pocket hole 41, the second arc section 4122 of the second side inner wall 412 is in contact with the outer wall of the thrust roller and limits the thrust roller to fall off, so that the limiting purpose is achieved, in addition, the second pocket hole 41 is of a staggered distributed structure, so that the suspension purpose is achieved when the thrust retainer is assembled in a bearing, and friction caused by contact of the thrust retainer with an inner gear ring and an outer ring is avoided.
At the initial stage of installing the thrust roller in the thrust retainer, the second shrinkage part 4123 can limit the thrust roller to fall towards the second 4121 direction of the straight-through section of the second pocket 41, so that the purpose of limiting is achieved, and in addition, the second 4122 arc section of the second pocket 41 limits the other moving direction of the thrust roller, so that the thrust roller is stably installed in the thrust retainer, an integral structure is formed, and the bearing is convenient to assemble.
And sealing rings 2 are arranged at the upper position and the lower position of the joint of the inner ring 1 and the outer ring.
The axial roller 3 and the radial roller 6 are both cylindrical rollers.
The three-row cylindrical roller variable pitch bearing of the wind generating set for independently changing the pitch utilizes the three-row cylindrical roller bearing to replace a traditional spherical bearing to be used as the variable pitch bearing, the bearing capacity of the variable pitch bearing is increased, the installation clearance of the axial roller 3 and the radial roller 6 is set to be a negative value, and the absolute value of the axial negative clearance value is greater than the absolute value of the radial negative clearance value, so that the two rows of axial rollers 3 can bear the overturning moment when the variable pitch bearing works, the radial roller 6 is prevented from being damaged due to the fact that the radial roller bears the overturning moment, and the three-row cylindrical roller variable pitch bearing has the advantages of being large in bearing capacity, high in rigidity and long in service; in addition, when the fan blade rotating device works, the variable pitch bearing is installed at the position of a fan blade, and when the fan blade rotates, three motors and the control system are adopted to control the three blades respectively, so that the traditional synchronous variable pitch becomes independent variable pitch, the fan can stably operate under different working conditions, the phenomenon of overload of the fan blade is avoided, and the generation efficiency of the fan is improved.
Claims (7)
1. The utility model provides a three rows of cylinder roller of independent oar become of wind generating set becomes oar bearing which characterized in that: the axial roller and the radial roller are arranged between the inner ring and the outer ring in an interference fit manner, and the interference magnitude of the axial roller is greater than that of the radial roller.
2. The three-row cylindrical roller pitch bearing of the wind generating set for independent pitch control according to claim 1, is characterized in that: the axial clearance value of the axial roller is-0.1 to-0.15 mm, and the radial clearance value of the radial roller is-0.06 to-0.1 mm.
3. The three-row cylindrical roller pitch bearing of the wind generating set for independent pitch control according to claim 1, is characterized in that: the outer ring comprises a first outer ring and a second outer ring, and the first outer ring is connected with the second outer ring through a connecting bolt.
4. The three-row cylindrical roller pitch bearing of the wind generating set for independent pitch control according to claim 1, is characterized in that: the radial roller bearing comprises a radial roller and is characterized in that a radial retainer is arranged in a cavity where the radial roller is located, a plurality of first pocket holes which are uniformly distributed around the center of the radial retainer in the circumferential direction and used for mounting the radial roller are formed in the circumferential direction of the radial retainer, each first pocket hole at the circumferential position of the radial retainer comprises two end inner walls I which are parallel to each other and two corresponding side inner walls I, each side inner wall I comprises a first straight-through section and a first arc section, the distance between the two first straight-through sections of a single pocket hole I is larger than the minimum distance between the two first arc sections, a first shrinkage part which is convenient for limiting the radial roller after being mounted is arranged at the junction of the first straight-through section and the first arc section of the side inner wall, and the positions of.
5. The three-row cylindrical roller pitch bearing of the wind generating set for independent pitch control according to claim 1, is characterized in that: the axial roller bearing comprises an axial roller and is characterized in that an axial retainer is arranged in a cavity where the axial roller is located, a plurality of pockets II which are uniformly distributed around the center of the axial roller and used for mounting the axial roller are arranged on the axial retainer in the thickness direction of the axial retainer, each pocket II comprises two end inner walls which are parallel to each other and two corresponding side inner walls, each side inner wall II comprises a direct section II and an arc section II, the distance between the two direct sections II of each pocket II is larger than the minimum distance between the two arc sections II, a limiting amount part II convenient for limiting the axial roller after the axial roller is mounted is arranged at the junction of the direct section II of each side inner wall II and the arc section II, and the two side inner walls of the two adjacent pockets II are opposite in position.
6. The three-row cylindrical roller pitch bearing of the wind generating set for independent pitch control according to claim 1, is characterized in that: and sealing rings are arranged at the upper position and the lower position of the joint of the inner ring and the outer ring.
7. The three-row cylindrical roller pitch bearing of the wind generating set for independent pitch control according to claim 1, is characterized in that: the axial roller and the radial roller are both cylindrical rollers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011406417.XA CN112443573A (en) | 2020-12-04 | 2020-12-04 | Three-row cylindrical roller variable pitch bearing with wind generating set independently variable pitch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011406417.XA CN112443573A (en) | 2020-12-04 | 2020-12-04 | Three-row cylindrical roller variable pitch bearing with wind generating set independently variable pitch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112443573A true CN112443573A (en) | 2021-03-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011406417.XA Pending CN112443573A (en) | 2020-12-04 | 2020-12-04 | Three-row cylindrical roller variable pitch bearing with wind generating set independently variable pitch |
Country Status (1)
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| CN (1) | CN112443573A (en) |
Citations (7)
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|---|---|---|---|---|
| US6464401B1 (en) * | 2001-01-26 | 2002-10-15 | United Technologies Corporation | High load capacity bi-directional tapered roller bearing |
| JP2013015200A (en) * | 2011-07-05 | 2013-01-24 | Jtekt Corp | Conical roller bearing |
| CN109899387A (en) * | 2019-03-26 | 2019-06-18 | 洛阳新强联回转支承股份有限公司 | A kind of three-row cylinder roller pitch variable bearings of roller guide retainer |
| CN110345163A (en) * | 2019-07-10 | 2019-10-18 | 无锡诚石轴承有限公司 | Special miniature webcam goes up and down special bearing structure |
| CN210461385U (en) * | 2019-07-01 | 2020-05-05 | 洛阳新强联回转支承股份有限公司 | Low-friction super-huge type double-row tapered roller slewing bearing |
| CN111894973A (en) * | 2020-08-10 | 2020-11-06 | 洛阳Lyc轴承有限公司 | Double-row tapered roller bearing with copper retainer structure |
| CN213808478U (en) * | 2020-12-04 | 2021-07-27 | 洛阳新强联回转支承股份有限公司 | Three-row cylindrical roller variable pitch bearing with wind generating set independently variable pitch |
-
2020
- 2020-12-04 CN CN202011406417.XA patent/CN112443573A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6464401B1 (en) * | 2001-01-26 | 2002-10-15 | United Technologies Corporation | High load capacity bi-directional tapered roller bearing |
| JP2013015200A (en) * | 2011-07-05 | 2013-01-24 | Jtekt Corp | Conical roller bearing |
| CN109899387A (en) * | 2019-03-26 | 2019-06-18 | 洛阳新强联回转支承股份有限公司 | A kind of three-row cylinder roller pitch variable bearings of roller guide retainer |
| CN210461385U (en) * | 2019-07-01 | 2020-05-05 | 洛阳新强联回转支承股份有限公司 | Low-friction super-huge type double-row tapered roller slewing bearing |
| CN110345163A (en) * | 2019-07-10 | 2019-10-18 | 无锡诚石轴承有限公司 | Special miniature webcam goes up and down special bearing structure |
| CN111894973A (en) * | 2020-08-10 | 2020-11-06 | 洛阳Lyc轴承有限公司 | Double-row tapered roller bearing with copper retainer structure |
| CN213808478U (en) * | 2020-12-04 | 2021-07-27 | 洛阳新强联回转支承股份有限公司 | Three-row cylindrical roller variable pitch bearing with wind generating set independently variable pitch |
Non-Patent Citations (1)
| Title |
|---|
| 张宏伟，邢振平，刘河，王晓东: "兆瓦级风电机组变桨轴承设计与技术要求", 《技术》 * |
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Application publication date: 20210305 |