WO2017135073A1 - Palier à billes pour une broche ayant un moteur incorporé - Google Patents

Palier à billes pour une broche ayant un moteur incorporé Download PDF

Info

Publication number
WO2017135073A1
WO2017135073A1 PCT/JP2017/001926 JP2017001926W WO2017135073A1 WO 2017135073 A1 WO2017135073 A1 WO 2017135073A1 JP 2017001926 W JP2017001926 W JP 2017001926W WO 2017135073 A1 WO2017135073 A1 WO 2017135073A1
Authority
WO
WIPO (PCT)
Prior art keywords
spindle
mesh
ball bearing
bearing
outer ring
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/JP2017/001926
Other languages
English (en)
Japanese (ja)
Inventor
崇広 金本
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 WO2017135073A1 publication Critical patent/WO2017135073A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • F16C33/72—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
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/447—Labyrinth packings
    • F16J15/453—Labyrinth packings characterised by the use of particular materials

Definitions

  • the present invention relates to a ball bearing for a motor built-in spindle used in a small spindle, particularly a motor built-in spindle, and more particularly to a ball bearing provided with a seal member covering an end opening of a bearing space formed between an inner ring and an outer ring. It is.
  • Small spindle is mainly used for light load machining such as aluminum machining.
  • the spindle with a built-in motor has a motor 2 built in the housing 1 of the spindle, the periphery of the motor 2 becomes a main heat generation source, so the motor 2 needs to be cooled together with the bearing 3.
  • the cooling in the housing 1 of the spindle with a built-in motor is mainly performed with air that does not require a complicated structure.
  • the air that cools the inside of the spindle housing 1 cools the motor 2 and then the bearing 3 from the rear side by a vent hole 4 installed in the spindle housing 1, and the spindle housing 1 from the front end 1 a of the spindle 1 It is discharged outside the housing 1.
  • the tip of the spindle housing 1 also serves as a seal against flying objects, and the pressure inside the spindle housing 1 is increased by an air curtain and a labyrinth seal so that cutting fluid, work pieces, etc. are contained in the spindle housing 1. Preventing intrusion.
  • the bearing 3 used for the spindle with a built-in motor is filled with grease as a lubricant, and both end faces are sealed with seal plates.
  • Lubricant may leak to the outside. This leakage of the lubricant may affect the durability performance of the bearing.
  • the vibration of the cage is transmitted to the spindle housing 1 and adversely affects machining accuracy and quietness.
  • the present invention prevents leakage of lubricant to the outside of the bearing due to cooling air when cooling air enters the bearing of the spindle with a built-in motor, and suppresses turbulent flow of cooling air inside the bearing.
  • the purpose of the present invention is to provide a pindle ball bearing that suppresses the vibration of the cage and is highly quiet.
  • an inner ring and an outer ring a plurality of rolling elements interposed between the inner ring and the outer ring, a cage that holds the rolling elements, and an opening of a gap between the inner ring and the outer ring And a ball bearing for spindle formed by sealing a lubricant around the rolling element,
  • the seal member includes a gas-permeable mesh portion at least partially.
  • the mesh portion may be provided in a portion located on the inner diameter side of the inner diameter surface of the cage.
  • the seal member includes a mesh member constituting the mesh-like portion, and a support member provided on the mesh member so as to be attached to the outer ring, and the mesh member has an inner diameter side than the support member.
  • the projecting portion can be a mesh-shaped portion.
  • the mesh member can be composed of a nonwoven fabric of synthetic resin fibers.
  • the seal plate since at least a part of the seal plate is a mesh-like portion, a mesh-like portion that allows a gas such as cooling air to pass through while retaining the lubricant in the bearing. This allows the cooling air to pass outside the bearing. For this reason, stable sealing performance and permeability of the cooling air in the bearing can be ensured, respectively, and the lubricant can be leaked to the outside or the cage vibration due to the turbulent flow of the cooling air can be prevented. Therefore, both bearing life and acoustic performance can be achieved.
  • the ball bearing for spindle with a built-in motor is an angular ball bearing.
  • An angular ball bearing 10 includes an inner ring 11, an outer ring 12, rolling elements 13 disposed on the rolling surfaces facing the inner ring 11 and the outer ring 12, a cage 14 that holds the rolling elements 13,
  • a seal plate 15 is provided on both end faces of the inner ring 11 and the outer ring 12 and covers an opening of a gap between the inner and outer rings.
  • the space between the inner ring 11 and the outer ring 12 is filled with grease as a lubricant, and leakage to the outside is prevented by the seal plate 15.
  • a lubricant is stably supplied between the raceway of the outer ring 12 and the rolling element 13, and between the raceway of the outer ring 12 and the cage 14.
  • a grease pocket 20 is provided.
  • the grease which is a lubricant, is preferably enclosed by about 40% to 50% of the static space volume. In the case of 40% or less, it is difficult to obtain a stable durability effect due to the bias of grease due to air pressure. In the case of 50% or more, due to grease bias due to air pressure, excessive rewinding of grease leads to large temperature fluctuations and vibration fluctuations, and stable rotation cannot be obtained.
  • the base oil viscosity of the grease is preferably 20 to 40 mm 2 / s.
  • the inner ring surface of the outer ring 12 is provided with mounting grooves 16 at both ends in the axial direction, and the outer peripheral portion of the seal plate 15 is supported by the mounting grooves 16.
  • the seal plate 15 has its inner peripheral portion opposed to the outer peripheral surface 11a of the inner ring 11 with a small radial gap.
  • the outer diameter surface 11a of the inner ring 11 facing the inner diameter portion of the seal plate 15 is formed in a straight line as shown in FIGS.
  • a seal groove for forming a labyrinth structure is not formed between the radial surface and the radial surface.
  • the seal plate 15 has a configuration in which two types of plate members, a mesh member 17 and a support member 18, are laminated.
  • the seal plate 15 is in a state where the mesh member 17 and the support member 18 are laminated, and is manufactured by insert molding as an example.
  • the mesh member 17 located on the inner side in the axial direction of the seal plate 15 has a mesh structure having a gas permeability by forming synthetic resin fibers into a sheet shape by means of knitting or weaving. It is a member.
  • a synthetic resin fiber non-woven fabric filter is used.
  • the mesh member 17 is preferably configured to have a pressure loss of about 50%, and is configured to allow only cooling air to pass through.
  • the synthetic resin constituting the mesh member is preferably compatible with grease and does not chemically attack the grease, or has a volume change rate of 10% or less.
  • a support member 18 is provided outside the seal plate 15 in the axial direction.
  • the support member 18 is made of rubber or synthetic resin in consideration of the mounting property to the outer ring, and supports the mesh member 17 having flexibility.
  • the support member 18 is provided to support the mesh member 17 and to be attached to the outer ring, and the configuration thereof is not limited as long as these can be embodied.
  • the support member 18 can also be provided with a through hole or the like through which air can permeate at a location where the mesh member 17 is laminated and supported.
  • the mesh member 17 is provided in a state of projecting to the inner ring side from the support member 18, and the projecting portion is a mesh-shaped portion 15a. Since only the mesh member 17 that is an air permeable material is disposed in the mesh-like portion 15a, the cooling air can be passed therethrough.
  • the mesh-like portion 15 a in which the mesh member 17 protrudes to the inner ring side from the support member 18 is located on the inner diameter side from the inner diameter surface 14 a of the cage 14.
  • the cooling air can pass without receiving the resistance of the cage 14 from the inlet side to the outlet side of the passing air.
  • the outer peripheral surface 11a of the inner ring 11 is also provided linearly, the projected area of the gap between the outer diameter surface of the inner ring 11 on the outlet side and the mesh-like portion 15a of the seal plate 15 is increased. This is almost the same as the projected projection area of the air flow path passing through the bearing.
  • the seal plate has a projected area through which air can pass substantially linearly without resistance between the mesh-like portion 15a of the seal plate 15 and the outer diameter surface of the inner ring 11 facing the seal plate 15.
  • the outer diameter surface 11a of the inner ring 11 facing the inner diameter portion of the seal plate 15 is formed in a straight line.
  • a seal groove 19 that forms a labyrinth structure may be provided between the outer diameter surface of 11 and the sealability of grease can be improved.
  • both the bearing life and the acoustic performance can be achieved in order to prevent the passage of the cooling air while holding the lubricant inside the bearing.
  • the present invention is not limited to angular contact ball bearings, but can be applied to other types of ball bearings or combination ball bearings having a seal plate.
  • a rubber or resin support member is laminated on the mesh member.
  • the seal plate is partially or entirely mesh-shaped. As long as the mesh-shaped part has gas permeability.
  • the whole can be configured by a mesh member.
  • a support framework for reinforcing the mesh member may be embedded in the mesh member.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Sealing Of Bearings (AREA)

Abstract

La présente invention traite le problème de la fourniture d'un palier à billes silencieux pour une broche ayant un moteur intégré qui, lorsque de l'air de refroidissement s'infiltre dans le palier à billes de broche, empêche la fuite d'huile vers l'extérieur du palier grâce à l'air de refroidissement et limite les vibrations de la cage en limitant l'écoulement tourbillonnaire de l'air de refroidissement à l'intérieur du palier. La présente invention concerne un palier à billes de broche (10) qui : est pourvu d'une bague interne (11) et d'une bague externe (12), de multiples éléments de roulement (13) intercalés entre la bague interne et la bague externe, d'une cage (14) destinée à contenir les éléments de roulement, et d'un élément d'étanchéité (15) destiné à recouvrir l'ouverture de l'espace entre la bague interne et la bague externe ; et est obtenu en scellant un lubrifiant autour des éléments de roulement. L'élément d'étanchéité (15) est pourvu d'une partie maillée (15a) dans une section qui est située radialement à l'intérieur de la surface d'alésage (14a) de la cage (14).
PCT/JP2017/001926 2016-02-01 2017-01-20 Palier à billes pour une broche ayant un moteur incorporé Ceased WO2017135073A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016017188A JP2017137894A (ja) 2016-02-01 2016-02-01 モータ内蔵スピンドル用玉軸受
JP2016-017188 2016-02-01

Publications (1)

Publication Number Publication Date
WO2017135073A1 true WO2017135073A1 (fr) 2017-08-10

Family

ID=59500727

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2017/001926 Ceased WO2017135073A1 (fr) 2016-02-01 2017-01-20 Palier à billes pour une broche ayant un moteur incorporé

Country Status (2)

Country Link
JP (1) JP2017137894A (fr)
WO (1) WO2017135073A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023233649A1 (fr) * 2022-06-03 2023-12-07 株式会社ジェイテクト Élément coulissant et palier à roulement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7686178B1 (ja) * 2024-07-10 2025-05-30 三菱電機株式会社 軸受状態検出装置と回転電機および軸受状態検出方法
WO2026013934A1 (fr) * 2024-07-10 2026-01-15 三菱電機株式会社 Dispositif de détection de l'état d'un palier, machine électrique tournante et procédé de détection de l'état d'un palier

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5597378U (fr) * 1978-12-28 1980-07-07
JPH0348518U (fr) * 1989-09-18 1991-05-09
JP2003097565A (ja) * 2001-09-25 2003-04-03 Nsk Ltd アンギュラ玉軸受
JP2005226675A (ja) * 2004-02-10 2005-08-25 Ntn Corp 密封形転がり軸受
WO2009125734A1 (fr) * 2008-04-08 2009-10-15 Nok株式会社 Dispositif d'étanchéité

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5597378U (fr) * 1978-12-28 1980-07-07
JPH0348518U (fr) * 1989-09-18 1991-05-09
JP2003097565A (ja) * 2001-09-25 2003-04-03 Nsk Ltd アンギュラ玉軸受
JP2005226675A (ja) * 2004-02-10 2005-08-25 Ntn Corp 密封形転がり軸受
WO2009125734A1 (fr) * 2008-04-08 2009-10-15 Nok株式会社 Dispositif d'étanchéité

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023233649A1 (fr) * 2022-06-03 2023-12-07 株式会社ジェイテクト Élément coulissant et palier à roulement

Also Published As

Publication number Publication date
JP2017137894A (ja) 2017-08-10

Similar Documents

Publication Publication Date Title
JP6595589B2 (ja) 摺動部品
JP6079052B2 (ja) 真空ポンプ
US20120328226A1 (en) Rolling bearing arrangement
JP6339433B2 (ja) モータ内蔵スピンドル用玉軸受
JP2017137894A (ja) モータ内蔵スピンドル用玉軸受
JP2010121683A (ja) 軸封装置
WO2020054133A1 (fr) Palier d'amortisseur et amortisseur
WO2016043090A1 (fr) Machine rotative
KR20140066777A (ko) 에어 베어링 유닛
WO2019172328A1 (fr) Dispositif d'amortissement de vibrations de roulements
CN108087556B (zh) 盒式密封结构
CN110259949A (zh) 密封装置
JP6560029B2 (ja) モータ内蔵スピンドル用玉軸受
JP2018145969A (ja) ターボ圧縮機
JP4435848B1 (ja) 軸固定型流体動圧軸受装置およびこれを備えたスピンドルモータおよび記録ディスク装置
WO2015152329A1 (fr) Palier de roulement avec filtre
JP4819147B2 (ja) 水中軸受
JP7265396B2 (ja) 工作用の回転機器
KR20150050259A (ko) 공작 기계의 주축 구조
KR102329460B1 (ko) 오일 시일 구조체
JP2004019760A (ja) 静圧軸受
CN108884874B (zh) 车轮轴承的密封装置
JP2019019925A (ja) 密封装置
JPH07151147A (ja) 静圧気体軸受装置
JP6342829B2 (ja) 回転装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17747232

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17747232

Country of ref document: EP

Kind code of ref document: A1