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WO2009048402A1 - A bearing actuator - Google Patents

A bearing actuator Download PDF

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Publication number
WO2009048402A1
WO2009048402A1 PCT/SE2008/000596 SE2008000596W WO2009048402A1 WO 2009048402 A1 WO2009048402 A1 WO 2009048402A1 SE 2008000596 W SE2008000596 W SE 2008000596W WO 2009048402 A1 WO2009048402 A1 WO 2009048402A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
bearing
gear teeth
actuator
roller bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2008/000596
Other languages
French (fr)
Inventor
Rickard Jonsson
Mitak Alisson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF AB
Original Assignee
SKF AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SKF AB filed Critical SKF AB
Publication of WO2009048402A1 publication Critical patent/WO2009048402A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/70—Bearing or lubricating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/79—Bearing, support or actuation arrangements therefor
    • 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
    • F16C2360/00—Engines or pumps
    • F16C2360/31—Wind motors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the invention concerns a bearing actuator.
  • An object of the invention is to provide a bearing actuator that withstands heavy loads, is compact, and has long service life.
  • a bearing actuator comprising a first bearing having a first ring fixable to a first mechanical element, a second ring fixable to a second mechanical element, and rolling elements located therebetween.
  • a second bearing is having a third ring and a fourth ring, and rolling elements located therebetween.
  • a third bearing is having a fifth ring and a sixth ring, and rolling elements located therebetween.
  • the third ring is being fixed in relation to the first ring via a first fixing means, and there is an eccenter between the second bearing and the third bearing.
  • the sixth ring is being provided with two axially adjacent sections, a first and a second section, of gear teeth along its periphery.
  • the first ring is being fixed in relation to a seventh ring via a second fixing means, wherein the seventh ring is provided with gear teeth that is interacting with the gear teeth of the sixth ring.
  • the second ring is being fixed in relation to an eighth ring via a third fixing means, wherein the eighth ring is provided with gear teeth that is interacting with the gear teeth of the sixth ring.
  • a stator and rotor arrangement is acting between the third ring and the fourth ring.
  • the stator and rotor arrangement is being responsible for accomplishing a relative movement such that the rotor drives the fourth ring, which leads to an eccentric movement of the sixth ring. This further leads to an interaction between the gear teeth on the sixth ring and the gear teeth on the seventh ring and the gear teeth on the eighth ring.
  • the reduction ratio between the gear teeth on the sixth and seventh respectively sixth and eighth ring is not equal. This leads further to a relative movement between the first ring and the second ring.
  • the eccentric movement of the sixth ring causes the first and second section of the gear teeth to roll off upon the gear teeth of the seventh and eighth ring, and the resulting relative rotational movement between the seventh and the eighth ring are different.
  • At least one gear tooth of each of the first and second section interacts with the gear teeth of the seventh and eighth ring.
  • the roll off movement results in that the gear teeth interacts in multi-turns, instead of only back and forth within a specific interval as for e.g. a pinion gear.
  • the bearing actuator according to the present invention will be subjected to less wear and improved lubrication.
  • a first section of the sixth ring is having N-n gear teeth and a second section is having M-m gear teeth, while the seventh ring is being provided with M gear teeth, and the eighth ring is being provided with N gear teeth.
  • a first section of the sixth ring is having N gear teeth and a second section is having M gear teeth, while the seventh ring is being provided with M-m gear teeth, and the eighth ring is being provided with N-n gear teeth.
  • the first ring is non-rotatable and the second ring is rotatable .
  • the first ring may be fixed to a rigid mechanical element.
  • the rigid mechanical element may e.g. be a wall, a frame, a chassis, a framework.
  • the first ring is rotatable and the second ring is non-rotatable.
  • both of the first ring and the second ring are rotatable.
  • the stator winding may be on the third ring, and the rotor on the fourth ring. In an embodiment, the stator winding may be on the fourth ring, and the rotor on the third ring.
  • the rotor may drive, e.g. via a second gear, via a connection, e.g. an arm or a plate, that will act upon the fourth ring in order to accommodate a movement .
  • a motor may be driving the third or the fourth ring.
  • the motor may be an electric motor.
  • n, m, N and M may not be trivial.
  • the second fixing means may for instance be a stiffening plate, arms, a ring, or a plurality of segments of a ring.
  • the third fixing means may for instance be a stiffening plate, arms, a ring, or a plurality of segments of a ring.
  • the bearing actuator further comprises a supporting member fixed to at least one of the first ring, the third ring or the seventh ring. This further improves the rigidity and stiffness of the bearing actuator.
  • the bearing actuator further comprises a supporting member fixed to at least one of the second ring or the eighth ring. This further improves the rigidity and stiffness of the bearing actuator.
  • the supporting member may for instance be a stiffening plate, arms, a ring, or a plurality of segments of a ring.
  • the supporting member is the first and third fixing means.
  • the supporting member is the second fixing means.
  • the bearing actuator may be even more compact with maintained high stiffness .
  • the rotor winding is integrated in the fourth or the fifth ring.
  • the two axially adjacent sections of gear teeth may be mounted onto the sixth ring.
  • the two axially adjacent sections of gear teeth may be forged on the sixth ring.
  • the second or the third bearing is one of a deep groove ball bearing, an angular contact rolling bearing, a self-aligning ball bearing, a cylindrical roller bearing, a spherical roller bearing, a needle roller bearing, a toroidal roller bearing, a slewing bearing, or a taper roller bearing.
  • the first bearing is one of a slewing bearing, a deep groove ball bearing, an angular contact rolling bearing, a self-aligning ball bearing, a cylindrical roller bearing, a spherical roller bearing, a needle roller bearing, a toroidal roller bearing, or a taper roller bearing.
  • the slewing bearing is one of a cross-roller bearing, a four-point contact bearing, a single-row ball bearing, a double-row ball bearing, single-row roller bearing, a double-row roller bearing, a three-row roller bearing, a wire race bearing, or a ball and roller bearing.
  • Figure 1 A schematic view of a bearing actuator according to an embodiment of the invention.
  • Figure 2 A schematic view of a bearing actuator according to an embodiment of the invention.
  • Figure 3 A schematic view of a bearing actuator according to an embodiment of the invention.
  • Figure 4 A schematic view of two interacting gear rings according to an embodiment of the invention
  • the bearing actuator 1 comprises a first bearing 2 that has a first ring 4 fixable to a first mechanical element 3, a second ring 6 fixable to a second mechanical element 5, and rolling elements 7 located therebetween.
  • a second bearing 8 has a third ring 10 and a fourth ring 12, and rolling elements 9 located therebetween.
  • a third bearing 14 has a fifth ring 16 and a sixth ring 18, and rolling elements 11 located therebetween.
  • the third ring 10 is fixed in relation to the first ring 4 via a first fixing means 20, which in this embodiment is a stiffening plate, and an eccenter 22 is located between the second bearing 8 and the third bearing 14.
  • the sixth ring 18 is provided with two axially adjacent sections of gear teeth along its periphery, wherein a first section is having N-n gear teeth 24, and a second section is having M-m gear teeth 26.
  • the first ring 4 is fixed in relation to a seventh ring 28 via a second fixing means 29, which in this embodiment is the same as the first fixing means 20.
  • the seventh ring 28 is provided with M gear teeth 30 that interact with the M-m gear teeth 26 of the sixth ring 18.
  • the second ring 6 is fixed in relation to an eighth ring 32 via a third fixing means 34, which in this embodiment is a stiffening plate.
  • the eighth ring 32 is provided with N gear teeth 36 that interact with the N-n gear teeth 24 of the sixth ring 18.
  • a stator and rotor arrangement 38 acts between the third ring 10 and the fourth ring 12.
  • the stator and rotor arrangement 38 is responsible for accomplishing a relative movement such that the rotor 40 drives the fourth ring 12.
  • the eccentric movement of the sixth ring 18 causes the first and second section of the gear teeth 24, 26 to roll off upon the gear teeth 30, 36 of the seventh 28 and eighth ring 32, and the resulting relative rotational movement between the seventh 28 and the eighth ring 32 are different.
  • At least one gear tooth of each of the first and second section of gear teeth 24, 26 interacts with the gear teeth 30, 36 of the seventh 28 and eighth ring 32. This leads to a relative movement between the first ring 4 and the second ring 6.
  • FIG 2 a schematic view of a bearing actuator according to an embodiment of the invention is shown. It comprises the same features and components as the bearing actuator 1 shown in figure 1. However, in this embodiment, the third bearing 14 is axially displaced somewhat from the second bearing 8, and the rotor 40 is integrated in the fifth ring 16.
  • FIG 3 a schematic view of a bearing actuator according to an embodiment of the invention is shown. It comprises the same features and components as the bearing actuator 1 shown in figure 1.
  • the first section of the sixth ring is having N gear teeth 24 and the second section is having M gear teeth 26, while the seventh ring 28 is being provided with M-m gear teeth 30, and the eighth ring 32 is being provided with N-n gear teeth 36.
  • the seventh ring 28 and the eighth ring 32 are located closer to the centre, in a radial direction, rather than to the peripheral of the first bearing 2.
  • FIG 4 a schematic view of two interacting gear rings according to an embodiment of the invention is shown.
  • the principle of an interaction between the second section of gear teeth 26 of the sixth ring 18 and the gear teeth 30 of the seventh ring 28 is illustrated.
  • the eccentric movement of the sixth ring 18 causes the gear teeth 26 to roll off upon the gear teeth 30 of the seventh ring 28 and wherein a relative rotational movement between the seventh and the eighth ring is generated.
  • At least one gear tooth of the first section 24 interacts with the gear teeth 30 of the seventh ring 28.
  • the same principle also applies to the interaction between the first section of gear teeth 24 of the sixth ring 18 and the gear teeth 36 of the eighth ring 32.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Retarders (AREA)

Abstract

A bearing actuator (1) comprising a first bearing (2) having a first ring (4) fixable to a first mechanical element (3), a second ring (6) fixable to a second mechanical element (5), and rolling elements (7). A second bearing (8) is having a third ring (10) and a fourth ring (12) and rolling elements (9), and a third bearing (14) is having a fifth ring (16), a sixth ring (18) and rolling elements (11). An eccenter (22) is provided between the second bearing (8) and the third bearing (14). The sixth ring (18) is provided with two axially adjacent sections of gear teeth (24, 26) along its periphery, the seventh ring (28) is provided with gear teeth (30), interacting with the gear teeth (26) of the sixth ring (18). The eighth ring (32) is provided with gear teeth (36), interacting with the gear teeth (24) of the sixth ring (18). A stator and rotor arrangement (38) is acting between the third ring (10) and the fourth ring (12) such that the rotor (40) drives the fourth ring (12), leading to an eccentric movement of the sixth ring (18), leading to a relative movement between the first ring (4) and the second ring (6).

Description

Title
A bearing actuator.
Field of the invention The invention concerns a bearing actuator.
Summary of invention
An object of the invention is to provide a bearing actuator that withstands heavy loads, is compact, and has long service life.
The object is achieved by a bearing actuator comprising a first bearing having a first ring fixable to a first mechanical element, a second ring fixable to a second mechanical element, and rolling elements located therebetween. A second bearing is having a third ring and a fourth ring, and rolling elements located therebetween. A third bearing is having a fifth ring and a sixth ring, and rolling elements located therebetween. The third ring is being fixed in relation to the first ring via a first fixing means, and there is an eccenter between the second bearing and the third bearing. The sixth ring is being provided with two axially adjacent sections, a first and a second section, of gear teeth along its periphery. The first ring is being fixed in relation to a seventh ring via a second fixing means, wherein the seventh ring is provided with gear teeth that is interacting with the gear teeth of the sixth ring. The second ring is being fixed in relation to an eighth ring via a third fixing means, wherein the eighth ring is provided with gear teeth that is interacting with the gear teeth of the sixth ring. A stator and rotor arrangement is acting between the third ring and the fourth ring. The stator and rotor arrangement is being responsible for accomplishing a relative movement such that the rotor drives the fourth ring, which leads to an eccentric movement of the sixth ring. This further leads to an interaction between the gear teeth on the sixth ring and the gear teeth on the seventh ring and the gear teeth on the eighth ring. The reduction ratio between the gear teeth on the sixth and seventh respectively sixth and eighth ring is not equal. This leads further to a relative movement between the first ring and the second ring. The eccentric movement of the sixth ring causes the first and second section of the gear teeth to roll off upon the gear teeth of the seventh and eighth ring, and the resulting relative rotational movement between the seventh and the eighth ring are different. At least one gear tooth of each of the first and second section interacts with the gear teeth of the seventh and eighth ring. The roll off movement results in that the gear teeth interacts in multi-turns, instead of only back and forth within a specific interval as for e.g. a pinion gear. As a consequence, the bearing actuator according to the present invention will be subjected to less wear and improved lubrication. The simultaneous interaction between the gear teeth of the first and second section and the gear teeth of the seventh and eighth ring results in that more gear teeth are in engagement at the same time. This design allows high forces and torques, while reducing play and backlash. Consequently, advantages with this bearing actuator are high stiffness, a compact and robust design, reduced need for maintenance due to improved lubrication, easy to mount, and low backlash. In an embodiment, a first section of the sixth ring is having N-n gear teeth and a second section is having M-m gear teeth, while the seventh ring is being provided with M gear teeth, and the eighth ring is being provided with N gear teeth.
In an embodiment, a first section of the sixth ring is having N gear teeth and a second section is having M gear teeth, while the seventh ring is being provided with M-m gear teeth, and the eighth ring is being provided with N-n gear teeth.
In an embodiment, the first ring is non-rotatable and the second ring is rotatable . For instance, the first ring may be fixed to a rigid mechanical element. Thus, by activating the stator and rotor arrangement, it may be possible to rotate or adjust a circumferential angle of the second ring, and thus rotate or adjust a circumferential angle of a mechanical element fixed to the second ring. In an embodiment, the rigid mechanical element may e.g. be a wall, a frame, a chassis, a framework.
In an embodiment, the first ring is rotatable and the second ring is non-rotatable.
In an embodiment, both of the first ring and the second ring are rotatable. In an embodiment, the stator winding may be on the third ring, and the rotor on the fourth ring. In an embodiment, the stator winding may be on the fourth ring, and the rotor on the third ring.
In an embodiment, the rotor may drive, e.g. via a second gear, via a connection, e.g. an arm or a plate, that will act upon the fourth ring in order to accommodate a movement . In an embodiment, a motor may be driving the third or the fourth ring. In an embodiment, the motor may be an electric motor.
It should be noted that the relation between n, m, N and M may not be trivial. A few steps indicating a process towards finding suitable relations include a) determination of desired gear ratio, b) determination of desired value of the tooth module (m) where the module=the ratio of the pitch diameter to the number of teeth, c) determining of approximate pitch diameter for the fixed gear wheel, d) calculation of the number of teeth and determination of the pitch diameter of the fixed wheel and of the eccentric wheel starting from the initial values in steps a) , b) and c) , e) drawing the teeth of the two gear wheels on a common sheet of drawing paper with guidance from the raw data for the values obtained in step d) , f) visual inspection of the drawn gear wheels for determining the areas on the wheels where the teeth interfere with each other, g) graphic determination of the profile shift and stubbing, whereby the basic eccentricity eo is changed to a new value eo - x.m where m is the module, h) drawing the teeth of the two wheels corrected according to g) , and possible residual correction of the eccentricity by a factor s, so that at all places round the wheels where the teeth are not in mesh, the top lands of respective teeth will have a predetermined minimum clearance, whereby the total eccentricity will be: etot =e0 +x.m-s. In an embodiment, the fourth ring and the fifth ring may be integrally manufactured. In an embodiment, the first fixing means may for instance be a stiffening plate, arms, a ring, or a plurality of segments of a ring.
In an embodiment, the second fixing means may for instance be a stiffening plate, arms, a ring, or a plurality of segments of a ring.
In an embodiment, the third fixing means may for instance be a stiffening plate, arms, a ring, or a plurality of segments of a ring. In an embodiment, the bearing actuator further comprises a supporting member fixed to at least one of the first ring, the third ring or the seventh ring. This further improves the rigidity and stiffness of the bearing actuator. In an embodiment, the bearing actuator further comprises a supporting member fixed to at least one of the second ring or the eighth ring. This further improves the rigidity and stiffness of the bearing actuator.
In an embodiment, the supporting member may for instance be a stiffening plate, arms, a ring, or a plurality of segments of a ring.
In an embodiment, the supporting member is the first and third fixing means. By this arrangement, the bearing actuator may be even more compact with maintained high stiffness.
In an embodiment, the supporting member is the second fixing means. By this arrangement, the bearing actuator may be even more compact with maintained high stiffness . In an embodiment, the rotor winding is integrated in the fourth or the fifth ring. In an embodiment, the two axially adjacent sections of gear teeth may be mounted onto the sixth ring. In an embodiment, the two axially adjacent sections of gear teeth may be forged on the sixth ring. In an embodiment, the second or the third bearing is one of a deep groove ball bearing, an angular contact rolling bearing, a self-aligning ball bearing, a cylindrical roller bearing, a spherical roller bearing, a needle roller bearing, a toroidal roller bearing, a slewing bearing, or a taper roller bearing.
In an embodiment, the first bearing is one of a slewing bearing, a deep groove ball bearing, an angular contact rolling bearing, a self-aligning ball bearing, a cylindrical roller bearing, a spherical roller bearing, a needle roller bearing, a toroidal roller bearing, or a taper roller bearing.
In an embodiment, the slewing bearing is one of a cross-roller bearing, a four-point contact bearing, a single-row ball bearing, a double-row ball bearing, single-row roller bearing, a double-row roller bearing, a three-row roller bearing, a wire race bearing, or a ball and roller bearing.
Brief description of the drawings Figure 1: A schematic view of a bearing actuator according to an embodiment of the invention.
Figure 2: A schematic view of a bearing actuator according to an embodiment of the invention. Figure 3: A schematic view of a bearing actuator according to an embodiment of the invention.
Figure 4: A schematic view of two interacting gear rings according to an embodiment of the invention
Detailed description of preferred embodiments In figure 1, a schematic view of a bearing actuator according to an embodiment of the invention is shown. The bearing actuator 1 comprises a first bearing 2 that has a first ring 4 fixable to a first mechanical element 3, a second ring 6 fixable to a second mechanical element 5, and rolling elements 7 located therebetween. A second bearing 8 has a third ring 10 and a fourth ring 12, and rolling elements 9 located therebetween. A third bearing 14 has a fifth ring 16 and a sixth ring 18, and rolling elements 11 located therebetween. The third ring 10 is fixed in relation to the first ring 4 via a first fixing means 20, which in this embodiment is a stiffening plate, and an eccenter 22 is located between the second bearing 8 and the third bearing 14. The sixth ring 18 is provided with two axially adjacent sections of gear teeth along its periphery, wherein a first section is having N-n gear teeth 24, and a second section is having M-m gear teeth 26. The first ring 4 is fixed in relation to a seventh ring 28 via a second fixing means 29, which in this embodiment is the same as the first fixing means 20. The seventh ring 28 is provided with M gear teeth 30 that interact with the M-m gear teeth 26 of the sixth ring 18. The second ring 6 is fixed in relation to an eighth ring 32 via a third fixing means 34, which in this embodiment is a stiffening plate. 'The eighth ring 32 is provided with N gear teeth 36 that interact with the N-n gear teeth 24 of the sixth ring 18. A stator and rotor arrangement 38, comprising a stator 39 and a rotor 40, acts between the third ring 10 and the fourth ring 12. The stator and rotor arrangement 38 is responsible for accomplishing a relative movement such that the rotor 40 drives the fourth ring 12. This leads to an eccentric movement of the sixth ring 18, which further leads to an interaction between the gear teeth 24, 26 on the sixth ring 18 and the gear teeth 30 on the seventh ring 28 and the gear teeth 36 on the eighth ring 32. The eccentric movement of the sixth ring 18 causes the first and second section of the gear teeth 24, 26 to roll off upon the gear teeth 30, 36 of the seventh 28 and eighth ring 32, and the resulting relative rotational movement between the seventh 28 and the eighth ring 32 are different. At least one gear tooth of each of the first and second section of gear teeth 24, 26 interacts with the gear teeth 30, 36 of the seventh 28 and eighth ring 32. This leads to a relative movement between the first ring 4 and the second ring 6.
In figure 2, a schematic view of a bearing actuator according to an embodiment of the invention is shown. It comprises the same features and components as the bearing actuator 1 shown in figure 1. However, in this embodiment, the third bearing 14 is axially displaced somewhat from the second bearing 8, and the rotor 40 is integrated in the fifth ring 16.
In figure 3, a schematic view of a bearing actuator according to an embodiment of the invention is shown. It comprises the same features and components as the bearing actuator 1 shown in figure 1. However, in this embodiment, the first section of the sixth ring is having N gear teeth 24 and the second section is having M gear teeth 26, while the seventh ring 28 is being provided with M-m gear teeth 30, and the eighth ring 32 is being provided with N-n gear teeth 36. Furthermore, the seventh ring 28 and the eighth ring 32 are located closer to the centre, in a radial direction, rather than to the peripheral of the first bearing 2.
In figure 4, a schematic view of two interacting gear rings according to an embodiment of the invention is shown. In this embodiment, the principle of an interaction between the second section of gear teeth 26 of the sixth ring 18 and the gear teeth 30 of the seventh ring 28 is illustrated. The eccentric movement of the sixth ring 18 causes the gear teeth 26 to roll off upon the gear teeth 30 of the seventh ring 28 and wherein a relative rotational movement between the seventh and the eighth ring is generated. At least one gear tooth of the first section 24 interacts with the gear teeth 30 of the seventh ring 28. The same principle also applies to the interaction between the first section of gear teeth 24 of the sixth ring 18 and the gear teeth 36 of the eighth ring 32.

Claims

1. A bearing actuator (1), comprising,
-a first bearing (2) having a first ring (4) fixable to a first mechanical element (3), a second ring (6) fixable to a second mechanical element (5) , and rolling elements (7) located therebetween,
-a second bearing (8) having a third ring (10) and a fourth ring (12), and rolling elements (9) located therebetween, -a third bearing (14) having a fifth ring (16) and a sixth ring (18), and rolling elements (11) located therebetween,
-the third ring (10) being fixed in relation to the first ring (4) via a first fixing means (20), -an eccenter (22) between the second bearing (8) and the third bearing (14),
-the sixth ring (18) being provided with two axially adjacent sections of gear teeth (24, 26) along its periphery, -the first ring (4) being fixed in relation to a seventh ring (28) via a second fixing means (29), wherein the seventh ring (28) is provided with gear teeth (30) , interacting with the gear teeth (26) of the sixth ring (18 ), -the second ring (6) being fixed in relation to an eighth ring (32) via a third fixing means (34), wherein the eighth ring (32) is provided with gear teeth (36), interacting with the gear teeth (24) of the sixth ring (18), -wherein the numbers of gear teeth (24, 26, 30, 36) on the sixth ring (18), the seventh ring (28), and the eighth ring (32) are different, such that the reduction ratio between the gear teeth (26, 30) on the sixth ring (18) and the seventh ring (28) is different than the reduction ratio between the gear teeth (24, 36) on the sixth ring (18) and the eighth ring (32),
-a stator and rotor arrangement (38) acting between the third ring (10) and the fourth ring (12), the stator and rotor arrangement (38) being responsible for accomplishing a relative movement such that the rotor (40) drives the fourth ring (12), leading to an eccentric movement of the sixth ring (18), leading to an interaction between the gear teeth (24, 26) on the sixth ring (18) and the gear teeth (30) on the seventh ring (28) and the gear teeth
(36) on the eighth ring (32) , leading to a relative movement between the first ring (4) and the second ring (6) .
2. A bearing actuator (1) according to claim 1, wherein a first section of the sixth ring (18) is having N-n gear teeth (24) and a second section is having M-m gear teeth (26), the seventh ring (28) being provided with M gear teeth (30) , and the eighth ring (32) being provided with N gear teeth (36) .
3. A bearing actuator (1) according to claim 1, wherein a first section of the sixth ring (18) is having N gear teeth (24) and a second section is having M gear teeth (26) , the seventh ring (28) being provided with M-m gear teeth (30), and the eighth ring (32) being provided with N-n gear teeth (36) .
4. A bearing actuator (1) according to claim 1, further comprising a supporting member fixed to at least one of the first ring (4), the third ring (10) or the seventh ring (28) .
5. A bearing actuator (1) according to claim 1, further comprising a supporting member fixed to at least one of the second ring (β) or the eighth ring (32) .
6. A bearing actuator (1) according to claim 1, wherein the rotor (40) is integrated in the fourth (12) or the fifth ring (16) .
7. A bearing actuator (1) according to claim 1, wherein the second (8) or the third bearing (14) is one of a deep groove ball bearing, an angular contact rolling bearing, a self-aligning ball bearing, a cylindrical roller bearing, a spherical roller bearing, a needle roller bearing, a toroidal roller bearing, a slewing bearing, or a taper roller bearing.
8. A bearing actuator (1) according to claim 1, wherein the first bearing (2) is one of a slewing bearing, a deep groove ball bearing, an angular contact rolling bearing, a self-aligning ball bearing, a cylindrical roller bearing, a spherical roller bearing, a needle roller bearing, a toroidal roller bearing, or a taper roller bearing. bearing actuator (1) according to claim 1, wherein the fourth ring (12) and the fifth ring (16) may be integrally manufactured.
PCT/SE2008/000596 2007-10-11 2008-10-13 A bearing actuator Ceased WO2009048402A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE0702295-7 2007-10-11
SE0702295 2007-10-11
SE0800452-5 2008-02-26
SE0800452 2008-02-26

Publications (1)

Publication Number Publication Date
WO2009048402A1 true WO2009048402A1 (en) 2009-04-16

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011128291A3 (en) * 2010-04-12 2012-03-22 Wobben, Aloys Wind energy installation azimuth or pitch drive
WO2012069062A1 (en) * 2010-11-26 2012-05-31 Vestas Wind Systems A/S A pitch system for a wind turbine
US8482435B2 (en) 2006-02-16 2013-07-09 Aloys Wobben Wind turbine comprising approach lighting
US10655610B2 (en) 2017-04-28 2020-05-19 General Electric Company Wire races for wind turbine bearings

Citations (4)

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US8482435B2 (en) 2006-02-16 2013-07-09 Aloys Wobben Wind turbine comprising approach lighting
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