WO2023248266A1 - 複列深溝玉軸受及び磁気軸受装置 - Google Patents

複列深溝玉軸受及び磁気軸受装置 Download PDF

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Publication number
WO2023248266A1
WO2023248266A1 PCT/JP2022/024441 JP2022024441W WO2023248266A1 WO 2023248266 A1 WO2023248266 A1 WO 2023248266A1 JP 2022024441 W JP2022024441 W JP 2022024441W WO 2023248266 A1 WO2023248266 A1 WO 2023248266A1
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WO
WIPO (PCT)
Prior art keywords
inner ring
raceway groove
rolling bearing
rotating shaft
bearing
Prior art date
Application number
PCT/JP2022/024441
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English (en)
French (fr)
Japanese (ja)
Inventor
和博 木村
浩 小野
Original Assignee
株式会社ジェイテクト
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 株式会社ジェイテクト filed Critical 株式会社ジェイテクト
Priority to PCT/JP2022/024441 priority Critical patent/WO2023248266A1/ja
Priority to TW111145598A priority patent/TW202400912A/zh
Publication of WO2023248266A1 publication Critical patent/WO2023248266A1/ja

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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
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/08—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with two or more rows of balls
    • 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
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • 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
    • F16C33/60—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings

Definitions

  • the present disclosure relates to a double-row deep groove ball bearing and a magnetic bearing device.
  • a turbomolecular pump which is a mechanical vacuum pump, is equipped with a magnetic bearing that supports a rotating shaft without contact. If an abnormality occurs in the magnetic bearing, it becomes impossible to support the rotating shaft. Therefore, the turbo-molecular pump includes a rolling bearing that supports the rotating shaft in the event of an abnormality in the magnetic bearing.
  • the rolling bearing is called a touchdown bearing.
  • Patent Document 1 discloses a turbomolecular pump including a magnetic bearing and a touchdown bearing.
  • the turbo molecular pump disclosed in Patent Document 1 includes, as a touchdown bearing, a first rolling bearing that can support the upper part of the rotating shaft, and a second rolling shaft that can support the lower part of the rotating shaft.
  • the first rolling bearing and the second rolling bearing are in a non-contact state with the rotating shaft.
  • the first rolling bearing and the second rolling bearing support the rotating shaft.
  • the first rolling bearing supports the rotating shaft in the radial direction
  • the second rolling bearing supports the rotating shaft in the radial and axial directions.
  • the first rolling bearing is a single row first rolling bearing.
  • the first rolling bearing 90 When the weight of the rotating shaft increases, the first rolling bearing receives a large radial load from the rotating shaft.
  • the load capacity of the first rolling bearing can be increased by increasing the diameter of the balls, which are rolling elements.
  • the volume of the first rolling bearing increases in the axial and radial directions, and as a result, the housing of the turbomolecular pump increases in size.
  • the first rolling bearing 90 includes one inner ring 91, one outer ring 98, a plurality of rolling elements 95 in the first row L1, and a plurality of rolling elements 95 in the second row L2.
  • a rolling element 92 is provided.
  • the inner ring 91 has an inner ring raceway groove 96 in a first row L1 and an inner ring raceway groove 93 in a second row L2.
  • the outer ring 98 has an outer ring raceway groove 97 in a first row L1 and an outer ring raceway groove 94 in a second row L2.
  • the bearing portion of the first row L1 includes an inner raceway groove 96 of the first row L1, an outer raceway groove 97 of the first row L1, and a plurality of rolling elements 95 of the first row L1.
  • the bearing portion of the second row L2 includes an inner raceway groove 93 of the second row L2, an outer raceway groove 94 of the second row L2, and a plurality of rolling elements 92 of the second row L2.
  • the first rolling bearing 90 is a double-row first rolling bearing.
  • the rotating shaft 99 may tilt and come into contact with the rolling bearing 90.
  • the rotating shaft 99 is biased in contact with the bearing portion of the first row L1 of the inner ring 91. Since the inner ring 91 includes the inner ring raceway groove 96 of the first row L1 and the inner ring raceway groove 93 of the second row L2, the inner ring raceway groove 96 of the first row L1 and the inner ring raceway groove 93 of the second row L2 are the same. Rotate at rotational speed. Therefore, the balls 95 roll in the inner ring raceway groove 96 and the outer ring raceway groove 97 in the bearing portion of the first row L1 where the radial load is large.
  • the rolling of the balls 95 causes the inner ring 91 to rotate relative to the outer ring 98.
  • the balls 92 may slide against the inner ring raceway groove 93 and the outer ring raceway groove 94, causing seizure.
  • the present disclosure provides a double-row deep groove ball bearing that can suppress slippage between the balls and raceway grooves even when the rotating shafts come into contact with each other at an angle.
  • An object of the present invention is to provide a magnetic bearing device including a double-row deep groove ball bearing.
  • the double row deep groove ball bearing of the present disclosure includes: an outer ring having a first outer ring raceway groove and a second outer ring raceway groove on the inner periphery; a first inner ring having a first inner ring raceway groove on its outer periphery; a second inner ring having a second inner ring raceway groove on its outer periphery; a plurality of first balls provided between the first inner raceway groove and the first outer raceway groove; a plurality of second balls provided between the second inner raceway groove and the second outer raceway groove; Equipped with The outer ring has a first portion in which the first outer ring raceway groove is provided, and a second portion that is integral with the first portion and is provided with the second outer ring raceway groove, The first inner ring and the second inner ring are separate bodies.
  • the magnetic bearing device of the present disclosure includes: housing and a rotating shaft provided within the housing; a first rolling bearing capable of supporting the rotating shaft; a second rolling bearing capable of supporting the rotating shaft; a radial magnetic bearing capable of supporting the rotating shaft in a radial direction; an axial magnetic bearing capable of supporting the rotating shaft in the axial direction; Equipped with The first rolling bearing is provided on a first side in the axial direction of the rotating shaft with respect to the center of gravity of the rotating shaft, and the second rolling bearing is provided on a first side of the rotating shaft with respect to the center of gravity of the rotating shaft.
  • the double-row deep groove ball bearing of the present disclosure even if the rotating shaft is tilted, it is possible to suppress slippage between the balls and the raceway grooves.
  • the magnetic bearing device of the present disclosure even if the rotating shaft is tilted, it is possible to suppress slippage between the balls and the raceway grooves.
  • FIG. 1 is a sectional view showing an example of a magnetic bearing device.
  • FIG. 2 is a cross-sectional view of the first rolling bearing.
  • FIG. 3 is a sectional view showing another form of the first rolling bearing.
  • FIG. 4 is a sectional view showing still another form of the first rolling bearing.
  • FIG. 5 is a sectional view showing still another modification of the first rolling bearing shown in FIG. 2.
  • FIG. 6 is a sectional view showing a modification of the first rolling bearing shown in FIG. 3.
  • FIG. FIG. 7 is a sectional view showing still another modification of the first rolling bearing shown in FIG. 3.
  • FIG. 8 is a sectional view showing a modification of the first rolling bearing shown in FIG. 4.
  • FIG. 9 is a sectional view showing still another modification of the first rolling bearing shown in FIG. 4.
  • FIG. 10 is a sectional view of a first conventional rolling bearing.
  • the double row deep groove ball bearing of the present disclosure includes: an outer ring having a first outer ring raceway groove and a second outer ring raceway groove on the inner periphery; a first inner ring having a first inner ring raceway groove on its outer periphery; a second inner ring having a second inner ring raceway groove on its outer periphery; a plurality of first balls provided between the first inner ring raceway groove and the first outer ring raceway groove; a plurality of second balls provided between the second inner raceway groove and the second outer raceway groove; Equipped with The outer ring has a first portion in which the first outer ring raceway groove is provided, and a second portion that is integral with the first portion and is provided with the second outer ring raceway groove, The first inner ring and the second inner ring are separate bodies.
  • the first inner ring can rotate independently in relation to the second inner ring, and the second inner ring can rotate independently in relation to the first inner ring. It becomes possible. A degree of freedom in rotation (rotational speed) is obtained between the first inner ring and the second inner ring. For this reason, even if the tilting rotating shaft contacts the first inner ring unevenly, slippage between the second inner ring and outer ring and the second ball is suppressed.
  • the first rolling bearing supports the rotating shaft in the radial direction.
  • the first inner ring can rotate independently in relation to the second inner ring.
  • a degree of freedom in rotation (rotational speed) is obtained between the first inner ring and the second inner ring. For this reason, even if the tilting rotating shaft contacts the first inner ring unevenly, slippage between the second inner ring and outer ring and the second ball is suppressed.
  • the rotating shaft 11 is provided within the housing 12.
  • the rotating shaft 11 includes a shaft main body 66 and a rotating block 64 that rotates integrally with the shaft main body 66.
  • the rotating block 64 has a plurality of rotary blades 65.
  • the rotary blades 65 and the fixed blades 63 are arranged alternately in the axial direction.
  • the rotating shaft 11 has a disk portion 67 at its lower part.
  • the rotating shaft 11 is rotatable around the central axis C within the housing 12.
  • the housing 12 is provided with radial magnetic bearings 13a, 13b and axial magnetic bearings 14a, 14b.
  • the first axial magnetic bearing 14a and the second axial magnetic bearing 14b are provided apart in the axial direction.
  • the first axial magnetic bearing 14a is provided on the disk portion 67.
  • the second axial magnetic bearing 14b is provided below the disk portion 67.
  • These axial magnetic bearings 14a and 14b can support the rotating shaft 11 without contact.
  • the axial magnetic bearings 14a and 14b have a function of supporting the rotating shaft 11 in the axial direction by magnetic force.
  • the axial magnetic bearings 14a, 14b employ a conventionally known configuration.
  • the first rolling bearing 16 is provided above the center of gravity G of the rotating shaft 11.
  • the second rolling bearing 17 is provided below the first rolling bearing 16 and below the center of gravity G of the rotating shaft 11. The first rolling bearing 16 and the second rolling bearing 17 will be explained below.
  • FIG. 2 is a cross-sectional view of the first rolling bearing 16.
  • FIG. 2 is a sectional view taken along a plane including the central axis C.
  • the first rolling bearing 16 is a double-row deep groove ball bearing, and is capable of supporting the rotating shaft 11 in the radial direction.
  • the rotating shaft 11 is indicated by a chain double-dashed line.
  • the first rolling bearing 16 is attached to the housing 12 around the central axis C.
  • the first rolling bearing 16 includes one outer ring 20, one first inner ring 21, one second inner ring 22, a plurality of first balls 23, and a plurality of second balls 24.
  • the first inner ring 21 and the second inner ring 22 are separate bodies and are provided separately.
  • the outer ring 20 is one bearing ring that is shared by the first inner ring 21 and the second inner ring 22.
  • the outer ring 20 is fixed to a part of the inner peripheral surface 70 of the housing 12.
  • the outer ring 20 is a cylindrical member.
  • the outer peripheral surface of the outer ring 20 is a bearing outer diameter surface.
  • a first outer ring raceway groove 26 and a second outer ring raceway groove 27 are provided on the inner periphery of the outer ring 20 .
  • the outer ring 20 has a first portion 20a and a second portion 20b that is integral with the first portion 20a.
  • the first outer ring raceway groove 26 is provided in the first portion 20a.
  • the second outer ring raceway groove 27 is provided in the second portion 20b.
  • the first portion 20a is a part of one cylindrical member, and the second portion 20b is the remaining part of the one cylindrical member.
  • the first portion 20a functions as an outer ring of the first row L1 of the first rolling bearing 16.
  • the second portion 20b functions as an outer ring of the second row L2 of the first rolling bearing 16.
  • the first portion 20a is located above the second portion 20b.
  • the first outer ring raceway groove 26 is located above the second outer ring raceway groove 27.
  • the outer ring 20 has a shoulder 36a above the first outer ring raceway groove 26.
  • the outer ring 20 has a shoulder 36b below the second outer ring raceway groove 27.
  • the outer ring 20 has an intermediate shoulder 30 between the first outer ring raceway groove 26 and the second outer ring raceway groove 27 .
  • the intermediate shoulder 30 is provided continuously in the circumferential direction.
  • the inner peripheral surface of the intermediate shoulder 30 has a smaller inner diameter than the raceway grooves 26 and 27.
  • the first inner ring 21 is a cylindrical member that is shorter in the axial direction than the outer ring 20.
  • the first inner ring raceway groove 28 is provided on the outer periphery of the first inner ring 21 .
  • the first inner ring 21 has shoulders 37 on both sides (upper and lower sides) of the first inner ring raceway groove 28 in the axial direction.
  • the first inner ring 21 has a first bearing inner diameter surface 31 located at the center in the axial direction, and a first chamfer provided on the upper and lower sides of the first bearing inner diameter surface 31 on its inner circumference. 32.
  • the first bearing inner diameter surface 31 is a cylindrical surface centered on the central axis C.
  • the inner diameter of the first inner ring 21 is larger than the outer diameter of the support portion of the rotating shaft 11 .
  • the second inner ring 22 is a cylindrical member that is shorter in the axial direction than the outer ring 20.
  • the second inner ring raceway groove 29 is provided on the outer periphery of the second inner ring 22.
  • the second inner ring 22 has shoulders 38 on both sides (upper and lower sides) of the second inner ring raceway groove 29 in the axial direction.
  • the second inner ring 22 has, on its inner periphery, a second bearing inner diameter surface 33 located at the center in the axial direction, and second chamfers provided on the upper and lower sides of the second bearing inner diameter surface 33, respectively. 34.
  • the second bearing inner diameter surface 33 is a cylindrical surface centered on the central axis C.
  • the inner diameter of the second inner ring 22 is larger than the outer diameter of the support portion of the rotating shaft 11 .
  • the inner diameter of the first inner ring 21 is the same as the inner diameter of the second inner ring 22.
  • the diameter of the first bearing inner diameter surface 31 is the inner diameter of the first inner ring 21
  • the diameter of the second bearing inner diameter surface 33 is the inner diameter of the second inner ring 22. Therefore, the diameter of the first bearing inner diameter surface 31 is the same as the diameter of the second bearing inner diameter surface 33.
  • the first inner ring 21 is located above the second inner ring 22.
  • the first inner ring 21 becomes the inner ring of the first row L1 of the first rolling bearing 16.
  • the second inner ring 22 becomes the inner ring of the second row L2 of the first rolling bearing 16.
  • a gap E is provided between the first inner ring 21 and the second inner ring 22 in the axial direction.
  • the gap E is set to an axial dimension that prevents the first inner ring 21 and the second inner ring 22 from coming into contact with each other even if the first inner ring 21 and the second inner ring 22 are displaced in the axial direction.
  • the plurality of first balls 23 are provided between the first inner ring raceway groove 28 and the first outer ring raceway groove 26.
  • the plurality of second balls 24 are provided between the second inner ring raceway groove 29 and the second outer ring raceway groove 27.
  • the first balls 23 serve as rolling elements of the first row L1 of the first rolling bearing 16.
  • the second balls 24 serve as rolling elements of the second row L2 of the first rolling bearing 16.
  • Each of the first outer ring raceway groove 26, the second outer ring raceway groove 27, the first inner ring raceway groove 28, and the second inner ring raceway groove 29 has an arc shape in a cross section including the central axis C.
  • the bearing portion of the first row L1 is constituted by a first portion 20a of the outer ring 20, a first inner ring 21, and a plurality of first balls 23.
  • the bearing portion of the second row L2 is constituted by the second portion 20b of the outer ring 20, the second inner ring 22, and the plurality of second balls 24.
  • the bearing portions in the first row L1 and the bearing portions in the second row L2 are each deep groove ball bearings.
  • the pitch diameter D1 of the ball set including the plurality of first balls 23 is the same as the pitch diameter D2 of the ball set including the plurality of second balls 24.
  • the diameter d1 of the first ball 23 is the same as the diameter d2 of the second ball 24.
  • the outer ring 20, the first inner ring 21, and the second inner ring 22 are made of, for example, high-speed tool steel, bearing steel, or stainless steel.
  • the first ball 23 and the second ball 24 are manufactured from high speed tool steel, bearing steel, stainless steel, or ceramics.
  • a coating is formed on each surface of the first outer ring raceway groove 26, the second outer ring raceway groove 27, the first inner ring raceway groove 28, and the second inner ring raceway groove 29.
  • the film is a solid lubricant.
  • the first rolling bearing 16 is a full ball bearing.
  • the bearing portions of the first row L1 and the bearing portions of the second row L2 are each not provided with a retainer. Adjacent first balls 23 and first balls 23 can come into contact with each other. Adjacent second balls 24 can come into contact with each other.
  • the second rolling bearing 17 can support the lower part of the rotating shaft 11.
  • the second rolling bearing 17 is composed of two angular ball bearings 18, 18.
  • the second rolling bearing 17 is a combination of a first angular contact ball bearing 18 and a second angular contact ball bearing 18 in a front-on arrangement.
  • the second rolling bearing 17 can support the rotating shaft 11 in the radial direction and the axial direction.
  • the third outer ring 39 and the fourth outer ring 40 are fixed to the housing 12 with their front surfaces in contact with each other in the axial direction.
  • the third inner ring 41 and the fourth inner ring 42 are provided so that their respective back surfaces are in contact with each other in the axial direction.
  • the inner diameter of each of the third inner ring 41 and the fourth inner ring 42 is larger than the outer diameter of the support portion of the rotating shaft 11.
  • the first rolling bearing 16 is able to support the rotating shaft 11 in the radial direction.
  • the first rolling bearing 16 cannot support the rotating shaft 11 in the radial direction. It becomes possible.
  • at least one of the first inner ring 21 and the second inner ring 22 comes into contact with the rotating shaft 11, and it becomes possible to support the rotating shaft 11 in the radial direction. .
  • the second rolling bearing 17 is able to support the rotating shaft 11 in the radial and axial directions.
  • the second rolling bearing 17 supports the rotating shaft 11 in the radial and axial directions. becomes possible. That is, when the rotating shaft 11 is no longer supported by the magnetic force, at least one of the third inner ring 41 and the fourth inner ring 42 comes into contact with the rotating shaft 11, and the second rolling bearing 17 supports the rotating shaft 11 in the radial direction. It becomes possible to support the The large diameter portion 11a of the rotating shaft 11 comes into contact with the third inner ring 41 in the axial direction, and the second rolling bearing 17 can support the rotating shaft 11 in the axial direction.
  • the rotating shaft 11 Before the rotating shaft 11, which becomes unstable, comes into contact with the radial magnetic bearings 13a and 13b, the rotating shaft 11 is supported by the first rolling bearing 16 and the second rolling bearing 17. Before the rotating shaft 11 comes into contact with the axial magnetic bearings 14a, 14b, which becomes unstable, the rotating shaft 11 is supported by the second rolling bearing 17.
  • FIG. 4 is a sectional view showing still another form of the first rolling bearing 16.
  • the diameter d1 of the first ball 23 is larger than the diameter d2 of the second ball 24.
  • the configuration excluding the diameter d1 of the first ball 23 and the diameter d2 of the second ball 24 of the first rolling bearing 16 shown in FIG. The configuration is the same except for the diameter d1 of the ball 23 and the diameter d2 of the second ball 24, and the explanation thereof will be omitted.
  • the reference numerals of the structure of the first rolling bearing 16 shown in FIG. 4 are the same as the reference numerals of the structure of the first rolling bearing 16 shown in FIG.
  • the first rolling bearing 16 of each of the above embodiments is provided with the first outer ring raceway groove 26 and the second outer ring raceway groove 27 on the inner periphery.
  • one first inner ring 21 having a first inner ring raceway groove 28 on its outer periphery; and one second inner ring 21 having a second inner ring raceway groove 29 on its outer periphery.
  • the first rolling bearing 16 of each of the above embodiments it is also possible to achieve the following effects.
  • the radial load received by the first rolling bearings 16 from the rotating shaft 11 in an inclined state is received by the bearings in the upper first row L1.
  • the load is distributed between the load and the load received by the bearing section of the lower second row L2.
  • the first rolling bearings 16 of each of the above-mentioned configurations have a radial load that is applied from the rotating shaft 11 to the bearings in the first row L1, and a radial load that is received from the rotating shaft 11 to the bearings in the second row L2.
  • the difference can be made smaller than that of the double-row first rolling bearing 90 of the prior art.
  • the first rolling bearing 16 of each of the above embodiments can have a load capacity larger than that of the conventional single-row first rolling bearing.
  • the first rolling bearing 16 of each of the above embodiments is a full ball bearing.
  • the first rolling bearing 16 of each type has grooves for the balls 23 and 24 in each bearing ring to enable assembly. The groove will be explained below. Note that in each of the following examples, the first inner ring 21 is provided above the second inner ring 22.
  • the first rolling bearing 16 is provided with a groove 71 for the second ball 24 at the center of the inner circumference of the outer ring 20 in the axial direction.
  • the insertion groove 71 for the second ball 24 has a shape obtained by removing a part of the intermediate shoulder 30 in the circumferential direction, and connects the first outer ring raceway groove 26 and the second outer ring raceway groove 27.
  • a groove 74 for the second ball 24 is provided on the outer periphery of the second inner ring 22 to connect the upper inner ring side surface 73 and the second inner ring raceway groove 29 .
  • the groove 74 for the second ball 24 has a shape obtained by removing a portion of the upper shoulder 38 of the second inner ring 22 in the circumferential direction.
  • the insertion groove 52 for the first ball 23 is provided on the inner periphery of the outer ring 20 so as to connect the upper outer ring side surface 51 and the first outer ring raceway groove 26 .
  • the groove 52 for the first ball 23 has a shape obtained by removing a portion of the upper shoulder 36a of the outer ring 20 in the circumferential direction.
  • the insertion groove 54 for the first ball 23 is provided on the outer periphery of the first inner ring 21 so as to connect the upper inner ring side surface 53 and the first inner ring raceway groove 28 .
  • the insertion groove 71 for the first ball 23 has a shape obtained by removing a part of the intermediate shoulder 30 in the circumferential direction, and connects the first outer ring raceway groove 26 and the second outer ring raceway groove 27.
  • the insertion groove 76 for the first ball 23 is provided on the outer periphery of the first inner ring 21 so as to connect the lower inner ring side surface 75 and the first inner ring raceway groove 28 .
  • the groove 76 for the first ball 23 has a shape obtained by removing a portion of the lower shoulder 37 of the first inner ring 21 in the circumferential direction.
  • FIG. 8 is a sectional view showing a modification of the first rolling bearing 16 shown in FIG. 4.
  • FIG. The fifth example shown in FIG. 8 is different from the first rolling bearing 16 shown in FIG. 4 in the configuration of the insertion groove.
  • the configuration of the first rolling bearing 16 shown in FIG. 8 except for the insertion groove is the same as the configuration of the first rolling bearing 16 shown in FIG. 4 except for the insertion groove, and the description thereof will be omitted.
  • the reference numerals of the first rolling bearing 16 shown in FIG. 8 have the same configuration as the first rolling bearing 16 shown in FIG. 4 except for the insertion groove.
  • the code is the same as that of No.16.
  • FIG. 8 which is a fifth example, is the same as that of the first rolling bearing 16 shown in FIG. 5, which is a second example, and the description thereof will be omitted.
  • the reference numerals of the insert grooves of the first rolling bearing 16 shown in FIG. 8, which have the same configuration as the insert grooves of the first rolling bearing 16 shown in FIG. is the same as In the first rolling bearing 16 of the fifth example, the bearing parts of the second row L2 are assembled, and then the bearing parts of the first row L1 are assembled.
  • FIG. 9 is a sectional view showing still another modification of the first rolling bearing 16 shown in FIG.
  • the sixth example shown in FIG. 9 is different from the first rolling bearing 16 shown in FIG. 4 in the configuration of the insertion groove.
  • the configuration of the first rolling bearing 16 shown in FIG. 9 except for the insertion groove is the same as the configuration of the first rolling bearing 16 shown in FIG. 4 except for the insertion groove, and the description thereof will be omitted.
  • the code is the same as that of No.16.
  • the insertion groove of the first rolling bearing 16 shown in FIG. 9, which is the sixth example is the same as that of the first rolling bearing 16 shown in FIG.
  • Magnetic bearing device 11 Rotating shaft 12 Housing 13a, 13b Radial magnetic bearing 14a, 14b Axial magnetic bearing 16 First rolling bearing (double row deep groove ball bearing) 17 Second rolling bearing 20 Outer ring 20a First part 20b Second part 21 First inner ring 22 Second inner ring 23 First ball 24 Second ball 26 First outer ring raceway groove 27 Second outer ring raceway groove 28 First inner ring raceway groove 29 Second inner ring raceway groove 51 Outer ring side surface 52 Insertion groove 53 Inner ring side surface 54 Insertion groove E Gap G Center of gravity position

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Bearings For Parts Moving Linearly (AREA)
PCT/JP2022/024441 2022-06-20 2022-06-20 複列深溝玉軸受及び磁気軸受装置 WO2023248266A1 (ja)

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PCT/JP2022/024441 WO2023248266A1 (ja) 2022-06-20 2022-06-20 複列深溝玉軸受及び磁気軸受装置
TW111145598A TW202400912A (zh) 2022-06-20 2022-11-29 複列深溝滾珠軸承以及磁性軸承裝置

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PCT/JP2022/024441 WO2023248266A1 (ja) 2022-06-20 2022-06-20 複列深溝玉軸受及び磁気軸受装置

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6140510U (ja) * 1984-08-16 1986-03-14 セイコー精機株式会社 磁気軸受装置
JPH07133828A (ja) * 1993-11-10 1995-05-23 Seiko Seiki Co Ltd 固体潤滑ベアリング
JPH07167139A (ja) * 1993-12-17 1995-07-04 Nippon Seiko Kk 複列玉軸受と予圧を付与された複列玉軸受の製造方法
JP2002168244A (ja) * 2000-11-30 2002-06-14 Koyo Seiko Co Ltd 転がり軸受
JP2004116558A (ja) * 2002-09-24 2004-04-15 Nsk Ltd 非接触型軸受の保護用転がり軸受

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6140510U (ja) * 1984-08-16 1986-03-14 セイコー精機株式会社 磁気軸受装置
JPH07133828A (ja) * 1993-11-10 1995-05-23 Seiko Seiki Co Ltd 固体潤滑ベアリング
JPH07167139A (ja) * 1993-12-17 1995-07-04 Nippon Seiko Kk 複列玉軸受と予圧を付与された複列玉軸受の製造方法
JP2002168244A (ja) * 2000-11-30 2002-06-14 Koyo Seiko Co Ltd 転がり軸受
JP2004116558A (ja) * 2002-09-24 2004-04-15 Nsk Ltd 非接触型軸受の保護用転がり軸受

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