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WO2018181752A1 - Élément d'espacement de roulement pour graissage, ensemble roulement et dispositif de broche - Google Patents

Élément d'espacement de roulement pour graissage, ensemble roulement et dispositif de broche Download PDF

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Publication number
WO2018181752A1
WO2018181752A1 PCT/JP2018/013330 JP2018013330W WO2018181752A1 WO 2018181752 A1 WO2018181752 A1 WO 2018181752A1 JP 2018013330 W JP2018013330 W JP 2018013330W WO 2018181752 A1 WO2018181752 A1 WO 2018181752A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
spacer
grease
compressed air
space
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/JP2018/013330
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English (en)
Japanese (ja)
Inventor
峰夫 古山
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.)
NTN Corp
Original Assignee
NTN Corp
NTN Toyo Bearing Co Ltd
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 NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Publication of WO2018181752A1 publication Critical patent/WO2018181752A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/12—Arrangements for cooling or lubricating parts of the machine
    • 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
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members

Definitions

  • the present invention relates to a bearing spacer for grease replenishment combined with a rolling bearing used under a condition where compressed air penetrates the inside of the bearing, such as a spindle device with a built-in motor of a small machine tool, the bearing set and the spindle device.
  • a bearing spacer for grease replenishment combined with a rolling bearing used under a condition where compressed air penetrates the inside of the bearing, such as a spindle device with a built-in motor of a small machine tool, the bearing set and the spindle device.
  • ⁇ Rolling bearings used for grease lubrication are generally used in a state where there is no positive inflow of air from outside into the bearing.
  • the outer cylinder cooling is generally used to remove the heat generated by the motor and the bearing and stabilize the spindle temperature by circulating the cooling liquid to the housing side.
  • the coolant passage is provided, the outer diameter of the housing increases, which is disadvantageous for space-saving use.
  • the air cooling type in which the compressed air is allowed to penetrate inside the bearing may be used.
  • a type that also serves as an air seal is adopted by flowing compressed air from the motor side and discharging the compressed air outside the housing near the tip of the spindle on the tool installation side (for example, Patent Document 1). )
  • FIG. 8 As a conventional general angular contact ball bearing, there are an open type of FIG. 8 and a sealed type of FIG. 9 as described above, but when used under the condition that the compressed air penetrates the inside of the bearing, Although the open type of FIG. 8 is easy to flow compressed air, grease is easily discharged. The arrows in FIG. 8 indicate the flow of compressed air.
  • the sealed type in FIG. 9 is easy to hold the grease, but the compressed air hardly flows. For this reason, the cooling effect and air sealing effect of the motor and the bearing are reduced.
  • An object of the present invention is to provide a grease replenishing bearing spacer, a bearing assembly, and a spindle device that can stably obtain lubrication inside the bearing for a long period of time under a condition where compressed air penetrates.
  • the grease replenishing bearing spacer of the present invention is a bearing spacer arranged on the compressed air supply side in a rolling bearing for use in passing compressed air into the bearing space, and is a set of an inner ring spacer and an outer ring spacer.
  • the set of the inner ring spacer and the outer ring spacer is configured such that grease can be held in the space between the both spacers.
  • the grease and its base oil inside the bearing spacer gradually move due to the compressed air, and move into the adjacent bearing, thereby supplying the reduced grease and its base oil in the bearing. To do. Thereby, the lifetime improvement of a bearing is obtained stably. For this reason, the initial amount of grease in the bearing is small, and unlike the case of increasing the amount of grease in the bearing, there is no problem of increase in stirring resistance, and heat generation is suppressed and high-speed rotation can be achieved. Further, since the spacer is provided with a function of holding the grease, it is only necessary to interpose it, it can be easily installed in the housing, and a large amount of grease can be held with a simple configuration.
  • the position where the grease is held in the bearing spacer is not particularly limited, but it is necessary to allow compressed air to pass therethrough.
  • the compression is performed. It can easily cope with the passage of air.
  • the grease replenishing bearing spacer of the present invention has a non-contact seal provided at both ends in the axial direction of the outer ring spacer and having an inner diameter side end close to the inner ring spacer to seal the inner space of the spacer. Also good.
  • the seal members are provided at both ends of the bearing spacer, excessive internal grease is prevented from flowing out, and the bearing is replenished in small amounts over a long period of time.
  • a bearing assembly with a grease replenishing function according to the present invention includes a rolling bearing for use in which compressed air is allowed to pass through a bearing space, and a bearing spacer having any one of the above-described structures disposed on the compressed air supply side of the rolling bearing. Prepare. According to the bearing set having this configuration, the above-described operations and effects described for the grease replenishing bearing spacer of the present invention can be obtained.
  • replenishment grease is held in the grease replenishing bearing spacer, bearing grease is enclosed in the rolling bearing, and the replenishment grease is more than the bearing grease.
  • the base oil viscosity may be low.
  • the grease in the bearing spacer for replenishing grease is located far from the place where lubrication is required compared to the sealed grease in the bearing. Replenishment of the required lubrication location is performed more smoothly and stably.
  • the inner ring spacer may be a member having the same specification as the inner ring of the rolling bearing
  • the outer ring spacer may be a member having the same specification as the outer ring of the rolling bearing.
  • the 2nd seal member which seals the spacer internal space of the said bearing spacer may be a member of the same specification as the 1st seal member which seals the both ends of the bearing space of the said rolling bearing. According to this configuration, it is possible to share the component parts between the rolling bearing and the bearing spacer.
  • the spindle device is formed in the housing, the bearing set having any one of the above-described configurations for supporting the main shaft, the motor for driving the main shaft, the housing for housing the bearing set and the motor, and the housing.
  • a compressed air ventilation path that passes through the outer periphery of the motor and through the bearing space of the bearing set.
  • FIG. 1 shows a bearing set using a grease replenishing bearing spacer according to this embodiment
  • FIG. 2 shows an example of a spindle device using this bearing set.
  • the bearing set 1 includes two bearings 2 and 2 that are rolling bearings and one bearing spacer 3 that is a grease-supplementing bearing spacer.
  • each bearing 2 is an angular contact ball bearing with a seal, and a plurality of rolling elements 6 made of balls are interposed between raceway surfaces 4a and 5a of the inner ring 4 and the outer ring 5, The rolling element 6 is held in the pocket of the cage 7.
  • First seal members 8 and 9 are attached to the inner periphery of the outer ring 5 to seal both ends of a bearing space formed between the inner and outer rings 4 and 5.
  • These first seal members 8, 9 constitute a non-contact seal (labyrinth seal) having an inner diameter end close to the outer peripheral surface of the inner ring 4 and a gap between the inner ring 4 and the first seal members 8, 9. ing.
  • the first seal members 8 and 9 are attached to the outer ring 5 by fitting the outer peripheral edges of the first seal members 8 and 9 into the seal mounting grooves 17 provided on the inner peripheral surface of the outer ring 5. .
  • annular grease pocket 10 is formed adjacent to the raceway surface on the front side.
  • the outer peripheral surface on the front side (bearing back side) following the raceway surface of the inner ring 4 is formed in a tapered surface that becomes smaller in diameter as it approaches the end.
  • both bearings 2 and 2 are installed back to back, and the grease pocket 10 is arranged on the non-adjacent side with respect to the outer ring raceway surface 5a.
  • the bearing spacer 3 includes a set of an inner ring spacer 11 and an outer ring spacer 12.
  • the inner ring spacer 11 is provided adjacent to the inner ring 4 of the bearing 2 in the axial direction
  • the outer ring spacer 12 is provided adjacent to the outer ring 5 of the bearing 2 in the axial direction.
  • the bearing spacer 3 holds the grease G1 in a space between the inner ring spacer 11 and the outer ring spacer 12 (hereinafter simply referred to as “spacer space”).
  • spacer space the grease G1 held in the spacer space is referred to as “replenishment grease G1”.
  • the bearing spacer 3 has second seal members 13 and 14 attached to both ends in the axial direction.
  • the second seal members 13 and 14 constitute a non-contact seal (labyrinth seal) that is attached to the outer ring spacer 12 and whose inner diameter end is close to the inner peripheral surface of the inner ring spacer 13 to seal the spacer space. .
  • the inner ring spacer 11 and the outer ring spacer 12 of the bearing spacer 3 are members having the same specifications as the inner ring 5 and the outer ring 6 of the bearing 2, respectively.
  • the second seal members 13 and 14 are also members having the same specifications as the first seal members 8 and 9 of the bearing 2.
  • the outer ring spacer 12 has the grease pocket 10 and the raceway surface 5a formed on the inner peripheral surface, and the seal mounting groove 17 is formed, and the second seal members 13 and 14 are formed in the seal mounting groove 17. Installed.
  • the inner ring spacer 11 and the outer ring spacer 12 of the bearing spacer 3 may be parts dedicated to the spacer different from the bearing 2.
  • the outer peripheral surface of the inner ring spacer 11 and the inner peripheral surface of the outer ring spacer 12 may be simple cylindrical surfaces.
  • the inner peripheral surface of the outer ring spacer 12 is a cylindrical surface, but has seal mounting grooves 17 at both ends.
  • the second seal members 13A and 14A at both ends are formed integrally with the outer ring spacer 11 as shown in FIG. May be. 6 and FIG. 7, between the seal members 13 and 13A of the bearing spacer 3 and the seal member 9 of the bearing 2 adjacent thereto, and / or the seal member 8 of the bearing 2 and the front end side.
  • Grease may also be enclosed in advance between the seal member 8 of the bearing 2.
  • each bearing set 1 the replenishment grease G ⁇ b> 1 is held in the bearing spacer 3 by applying the replenishment grease G ⁇ b> 1 to the inner peripheral surface of the outer ring spacer 12.
  • Each bearing 2 is also sealed with grease G2 by applying grease G2 to the inner peripheral surface of the outer ring 5 or the like.
  • the grease G2 sealed in the bearing 2 is referred to as “bearing grease”.
  • the replenishment grease G1 in the bearing spacer 3 and the bearing grease G2 in the bearing 2 are preferably the same type.
  • the viscosities of the base oils of these greases G1 and G2 are preferably the same, or the replenishment grease G1 is preferably softer (lower viscosity) than the bearing grease G2.
  • These greases G1 and G2 may be soap-based or non-soap-based such as urea-based.
  • FIG. 2 shows an example of the spindle device S using the bearing set 1 of FIG.
  • This spindle device is a spindle device of a machine tool, and includes a plurality of bearing sets 1 and 31 that support a main shaft 21 and a motor 23 that drives the main shaft 21.
  • the bearing sets 1 and 31 and the motor 23 are accommodated in the inner peripheral hole 20a of the same housing 20 side by side in the axial direction.
  • the spindle 21 has a spindle head 21a to which a tool (not shown) is attached at the tip.
  • the rear part of the main shaft 21 is driven by the motor 23.
  • the motor 23 includes a rotor provided on the outer periphery of the main shaft 21 and a stator provided on the inner periphery of the motor case.
  • the motor 23 is installed on the outer periphery of the inner peripheral surface of the housing 20 via a gap.
  • the bearing set on the spindle head 21a side is the bearing set 1 having the bearing spacer 3 of the embodiment of FIG.
  • the bearing set 31 is a bearing set that does not have the bearing spacer 3.
  • the bearing spacer 3 is arranged at the most upstream side of the flow of the compressed air CA (that is, the compressed air CA supply side), that is, at the motor 23 side end.
  • the bearing set 1 having the bearing spacer 3 may be arranged on the motor 23 side. As shown in FIG. 4, both the bearing sets are bearings having the bearing spacer 3. Set 1 may be used.
  • a ventilation path 25 for compressed air CA is formed in the housing 20 so as to pass through the outer periphery of the motor 23 and through the bearing space in each of the bearing sets 1 and 31.
  • a compressed air inlet 25 a that forms part of the ventilation path 25 is provided on the end face wall of the rear end of the housing 20.
  • the compressed air inlet 25a is connected to a compressed air supply source (not shown) such as a blower by piping.
  • the compressed air outlet 25b that forms a part of the ventilation path 25 is formed by a gap between the front end opening of the inner peripheral hole 20a of the housing 20 and a shielding plate provided at an inner position of the spindle head 21a of the spindle 21. Yes.
  • the compressed air CA passes through the outer periphery of the motor 23 and the bearing space of each bearing 2, whereby the motor 23 and each bearing 2 are cooled. Since the compressed air CA flows in each bearing 2, the outer diameter of the housing 20 can be made compact compared to a configuration in which a path for liquid cooling is provided in the housing 20, but on the other hand, bearing grease G 2 in each bearing 2. And its base oil gradually flows out due to the compressed air CA.
  • the replenishment grease G1 inside the bearing spacer 1 gradually moves and moves into the bearings 2 arranged on the downstream side of the compressed air flow, thereby reducing the bearing grease G2 within the bearings 2. And replenish its base oil. Thereby, the lifetime improvement of the bearing 2 is obtained stably. Since the initial amount of the bearing grease G2 is small, unlike the case where the bearing grease G2 is increased, the problem of an increase in stirring resistance does not occur, and heat generation can be suppressed and high-speed rotation can be achieved. Further, since the bearing spacer 3 has a function of holding the replenishment grease G1, the bearing spacer 3 may be simply interposed between the bearings 2 and 2 or between the stepped surfaces of the bearing 2 and the housing 20. Can be easily installed, and a large amount of grease can be held with a simple configuration.
  • the bearing spacer 3 of this embodiment has the second seal members 13 and 14 at both ends thereof, it is possible to prevent the replenishment grease G1 inside the bearing spacer 3 from flowing out excessively, and for a long period of time. As a result, the bearing 2 is replenished little by little.
  • the arrangement of the bearing spacers 3 in the spindle device S may be appropriately set according to the characteristics of the spindle device S and the like.
  • the compressed air outlet 25b in the housing 20 has a high flow rate because the compressed air CA is released to the atmosphere, and the bearing grease G2 is easily discharged in the vicinity thereof. Therefore, as shown in the example of FIG. 2, by providing the bearing spacer 3 on the bearing set 1 on the spindle head 21a side, the bearing 2 for replenishing the bearing grease G2 is replenished from the bearing spacer 3 for replenishing grease.
  • Grease G1 can be supplied.
  • the bearing set 31 that does not have the downstream bearing spacer 3 is included.
  • the replenishment grease G1 can be supplied to the entire bearing 2.
  • the bearing spacer 3 for replenishing grease is provided in both the front and rear bearing sets 1 as in the example of FIG. 4, the amount of grease retained can be increased to further improve the durability of the grease.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Sealing Of Bearings (AREA)

Abstract

L'invention concerne un élément d'espacement de roulement (3) placé sur un côté d'alimentation en air comprimé d'un palier à roulements, pour des applications dans lesquelles de l'air comprimé (CA) est amené à passer à l'intérieur d'un espace d'un roulement. L'élément d'espacement de roulement (3) comprend un ensemble constitué d'un élément d'espacement de bague intérieure (11) et d'un élément d'espacement de bague extérieure (12). L'ensemble formé par l'élément d'espacement de bague intérieure (11) et l'élément d'espacement de bague extérieure (12) est conçu pour permettre de retenir la graisse dans un espace se situant entre les éléments d'espacement. L'élément d'espacement de roulement (3) peut être pourvu de joints sans contact qui sont placés aux deux extrémités, dans la direction axiale, de l'élément d'espacement de bague extérieure (12), et dont les extrémités latérales du diamètre interne entrent en contact avec l'élément d'espacement de bague intérieure (11) pour sceller l'espace entre les éléments d'espacement.
PCT/JP2018/013330 2017-03-30 2018-03-29 Élément d'espacement de roulement pour graissage, ensemble roulement et dispositif de broche Ceased WO2018181752A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017067044A JP2018168952A (ja) 2017-03-30 2017-03-30 グリース補給用軸受間座・軸受組およびスピンドル装置
JP2017-067044 2017-03-30

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WO2018181752A1 true WO2018181752A1 (fr) 2018-10-04

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WO (1) WO2018181752A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113374784A (zh) * 2020-03-09 2021-09-10 精工电子有限公司 滚动轴承、旋转设备和滚动轴承的制造方法
CN113374785A (zh) * 2020-03-09 2021-09-10 精工电子有限公司 滚动轴承、旋转设备和滚动轴承的制造方法
JP2021139497A (ja) * 2020-03-09 2021-09-16 セイコーインスツル株式会社 転がり軸受、回転機器および転がり軸受の製造方法
JP2021139498A (ja) * 2020-03-09 2021-09-16 セイコーインスツル株式会社 転がり軸受、回転機器および転がり軸受の製造方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11052422B2 (en) 2018-07-10 2021-07-06 Creative Coatings Co., Ltd. Electronic component manufacturing method and apparatus

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1425068A1 (de) * 1963-06-05 1968-12-12 Wilhelm Hermann Mueller & Co K Waelzlagerabdichtung mit einem als elastisches Polster und als Schmierfettbehaelter dienenden Kapselgehaeuse aus plastischem Kunststoff
JPH0953564A (ja) * 1995-08-11 1997-02-25 Anest Iwata Corp オイルフリー往復圧縮機の連接棒小端部潤滑方法
JP2002005181A (ja) * 2000-06-27 2002-01-09 Nsk Ltd 転がり軸受用潤滑装置
JP2002301636A (ja) * 2001-04-03 2002-10-15 Minitor Kk スピンドルモータ
JP2003314571A (ja) * 2002-04-25 2003-11-06 Nsk Ltd 転がり軸受潤滑装置
JP2007105850A (ja) * 2005-10-14 2007-04-26 Brother Ind Ltd 主軸装置及び当該装置を備えた工作機械
JP2008115922A (ja) * 2006-11-02 2008-05-22 Ntn Corp 転がり軸受
JP2017002971A (ja) * 2015-06-09 2017-01-05 Ntn株式会社 モータ内蔵スピンドル用玉軸受

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1425068A1 (de) * 1963-06-05 1968-12-12 Wilhelm Hermann Mueller & Co K Waelzlagerabdichtung mit einem als elastisches Polster und als Schmierfettbehaelter dienenden Kapselgehaeuse aus plastischem Kunststoff
JPH0953564A (ja) * 1995-08-11 1997-02-25 Anest Iwata Corp オイルフリー往復圧縮機の連接棒小端部潤滑方法
JP2002005181A (ja) * 2000-06-27 2002-01-09 Nsk Ltd 転がり軸受用潤滑装置
JP2002301636A (ja) * 2001-04-03 2002-10-15 Minitor Kk スピンドルモータ
JP2003314571A (ja) * 2002-04-25 2003-11-06 Nsk Ltd 転がり軸受潤滑装置
JP2007105850A (ja) * 2005-10-14 2007-04-26 Brother Ind Ltd 主軸装置及び当該装置を備えた工作機械
JP2008115922A (ja) * 2006-11-02 2008-05-22 Ntn Corp 転がり軸受
JP2017002971A (ja) * 2015-06-09 2017-01-05 Ntn株式会社 モータ内蔵スピンドル用玉軸受

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113374784A (zh) * 2020-03-09 2021-09-10 精工电子有限公司 滚动轴承、旋转设备和滚动轴承的制造方法
CN113374785A (zh) * 2020-03-09 2021-09-10 精工电子有限公司 滚动轴承、旋转设备和滚动轴承的制造方法
JP2021139497A (ja) * 2020-03-09 2021-09-16 セイコーインスツル株式会社 転がり軸受、回転機器および転がり軸受の製造方法
JP2021139498A (ja) * 2020-03-09 2021-09-16 セイコーインスツル株式会社 転がり軸受、回転機器および転がり軸受の製造方法
JP7491836B2 (ja) 2020-03-09 2024-05-28 セイコーインスツル株式会社 転がり軸受、回転機器および転がり軸受の製造方法
JP7495343B2 (ja) 2020-03-09 2024-06-04 セイコーインスツル株式会社 転がり軸受、回転機器および転がり軸受の製造方法

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