WO2023002891A1 - 絶縁転がり軸受 - Google Patents
絶縁転がり軸受 Download PDFInfo
- Publication number
- WO2023002891A1 WO2023002891A1 PCT/JP2022/027512 JP2022027512W WO2023002891A1 WO 2023002891 A1 WO2023002891 A1 WO 2023002891A1 JP 2022027512 W JP2022027512 W JP 2022027512W WO 2023002891 A1 WO2023002891 A1 WO 2023002891A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- outer ring
- resin film
- rolling bearing
- outer diameter
- resin
- Prior art date
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 56
- 229920005989 resin Polymers 0.000 claims abstract description 77
- 239000011347 resin Substances 0.000 claims abstract description 77
- 230000003746 surface roughness Effects 0.000 claims description 10
- 238000009413 insulation Methods 0.000 abstract description 3
- 239000000919 ceramic Substances 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
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
- F16C19/04—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
- F16C19/06—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 a single row or 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
- F16C33/58—Raceways; Race rings
-
- 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
- F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
- F16C41/002—Conductive elements, e.g. to prevent static electricity
Definitions
- This invention relates to insulating rolling bearings.
- insulated rolling bearings are generally used.
- the insulated rolling bearing comprises an outer ring, an inner ring coaxially arranged radially inside the outer ring, a plurality of rolling elements incorporated between the outer ring and the inner ring, and covering the outer diameter surface of the outer ring and the axial end face of the outer ring. and an insulating layer that These insulated rolling bearings are roughly classified into those using a ceramic film as an insulating layer and those using a resin film as an insulating layer.
- Patent Document 1 As an insulated rolling bearing using a ceramic film as an insulating layer, for example, the one described in Patent Document 1 is known.
- the insulated rolling bearing of Patent Document 1 has the advantage that high insulation performance can be obtained because the insulating layer is a ceramic film.
- There is a problem of high manufacturing cost due to the need to perform a pore-sealing treatment to fill a large number of pores in the film with a sealing agent such as a synthetic resin, and the need to polish the surface of the ceramic film. be.
- a sealing agent such as a synthetic resin
- the ceramic coating may crack when impact is applied.
- Patent Documents 2 to 7 As an insulating rolling bearing using a resin film as an insulating layer, for example, those described in Patent Documents 2 to 7 are known.
- the insulated rolling bearings of Patent Documents 2 to 7 are manufactured by setting an outer ring in a resin injection mold and injecting molten resin into a cavity formed between the inner surface of the mold and the surface of the outer ring. By doing so, a resin film is formed on the outer diameter surface of the outer ring and the axial end surface of the outer ring (so-called insert molding).
- This insulated rolling bearing has the advantage that the manufacturing cost can be kept low and there is no problem of cracking unlike the ceramic film.
- JP 2015-209562 A Japanese Patent Application Laid-Open No. 2020-063826 JP 2013-174303 A Japanese Patent Application Laid-Open No. 2003-148482 JP-A-10-37966 Japanese Patent Application Laid-Open No. 9-88972 JP-A-7-208462
- an electric motor is used as a prime mover for driving the vehicle.
- the electric motor of this electric vehicle is driven by an inverter at a high frequency for high efficiency. Therefore, a rolling bearing that supports a rotating shaft of an electric motor of an electric vehicle is susceptible to electric current flow inside the bearing, which may cause electrolytic corrosion.
- the inventors of the present application have studied using an insulated rolling bearing having a resin film as an insulating layer instead of an insulated rolling bearing having a ceramic film as an insulating layer as a bearing that supports the rotating shaft of an electric motor of an electric vehicle. bottom.
- the insulated rolling bearings (having a resin film as an insulating layer) of Patent Documents 2 to 7 as a bearing that supports the rotating shaft of an electric motor of an electric vehicle, the fit between the outer ring and the housing It turned out to be difficult to set the gap properly.
- a bearing that supports a rotating shaft of an electric motor of an electric vehicle is in a high temperature state when the temperature of the electric motor rises, and is in a low temperature state when the vehicle is started in winter.
- the insulated rolling bearings of Patent Documents 2 to 7 having an outer ring whose outer diameter surface is covered with a resin film having a thickness of about 1 mm is used as a bearing to support the rotating shaft of the electric motor of an electric vehicle, if the fitting gap between the outer ring and the housing is reduced, the resin film will thermally expand at high temperatures, causing the outer ring and housing to become loose. On the other hand, it was found that increasing the fitting clearance between the outer ring and housing could create an excessive clearance between the outer ring and housing when the temperature is low. .
- the problem to be solved by the present invention is to provide an insulating material that can be used as a bearing that supports the rotating shaft of an electric motor of an electric vehicle at low cost and that can appropriately set the fitting clearance between the outer ring and the housing. To provide a rolling bearing.
- the present invention provides an insulated rolling bearing having the following configuration. an outer ring; an inner ring coaxially disposed radially inward of the outer ring; a plurality of rolling elements incorporated between the outer ring and the inner ring; An insulated rolling bearing comprising an insulating layer covering an outer diameter surface of the outer ring and an axial end surface of the outer ring, The insulating rolling bearing, wherein the insulating layer is a resin film having a film thickness of 50 ⁇ m or less at a portion covering the outer diameter surface of the outer ring.
- the resin film is preferably formed so that the film thickness of the portion covering the outer diameter surface of the outer ring and the film thickness of the portion covering the axial end face of the outer ring are 10 ⁇ m or more.
- the resin film can effectively suppress the passage of electric current inside the bearing during rotation, so that electrolytic corrosion can be suppressed, and the bearing is more efficient than a normal bearing without a resin film. A significantly longer life can be obtained.
- the outer diameter surface of the outer ring is preferably formed to have a surface roughness of Ra 0.1 ⁇ m or more and Ra 0.8 ⁇ m or less.
- the adhesion strength of the resin film to the outer diameter surface of the outer ring can be increased.
- the outer diameter surface of the outer ring has a surface roughness of Ra 0.8 ⁇ m or less
- the surface roughness of the resin film is small. Since it can be suppressed, there is no need to perform additional processing such as polishing on the surface of the resin film, resulting in low cost.
- the resin film is preferably made of a resin having a coefficient of linear expansion of 6.5 ⁇ 10 ⁇ 5 /° C. or less.
- the insulated rolling bearing of the present invention employs a resin film instead of a ceramic film as the insulating film, so it is low cost.
- the film thickness of the resin film in the portion covering the outer diameter surface of the outer ring is thin, the change in film thickness of the resin film due to temperature changes is small, and when the temperature is high, the expansion of the resin film causes the outer ring and the housing to become separated. It is possible to prevent the occurrence of excessive interference between them and, on the other hand, the occurrence of excessive clearance between the outer ring and the housing in cold conditions. Therefore, when it is used as a bearing that supports the rotary shaft of the electric motor of an electric vehicle, it is possible to appropriately set the fitting clearance between the outer ring and the housing.
- FIG. 1 is a sectional view showing an insulated rolling bearing according to an embodiment of the invention. Enlarged view of the vicinity of the outer diameter surface of the outer ring in FIG.
- FIG. 1 shows an insulated rolling bearing 1 according to an embodiment of the invention.
- the insulated rolling bearing 1 includes an outer ring 2, an inner ring 3 coaxially disposed radially inside the outer ring 2, a plurality of rolling elements 4 incorporated between the outer ring 2 and the inner ring 3, and the plurality of rolling elements 4. It has a retainer 5 that maintains a circumferential interval, and a resin film 8 (insulating layer) that covers an outer diameter surface 6 and an axial end surface 7 of the outer ring 2 .
- the inner circumference of the outer ring 2 is formed with an outer ring raceway groove 9 with which the rolling elements 4 are in rolling contact, and outer ring shoulder portions 10 located on both sides of the outer ring raceway groove 9 in the axial direction.
- the outer circumference of the inner ring 3 is also formed with an inner ring raceway groove 11 with which the rolling elements 4 are in rolling contact, and inner ring shoulder portions 12 positioned on both sides of the inner ring raceway groove 11 in the axial direction.
- the rolling elements 4 are balls here.
- Both the outer ring raceway groove 9 and the inner ring raceway groove 11 are grooves having an arcuate cross section.
- the outer ring 2, inner ring 3, and rolling elements 4 are all made of metal (for example, bearing steel).
- the outer diameter surface 6 of the outer ring 2 is a constant cylindrical surface (that is, a cylindrical surface without grooves) whose outer diameter does not change along the axial direction.
- a chamfered portion 13 having an arcuate cross section is formed between the outer diameter surface 6 of the outer ring 2 and the axial end surface 7 of the outer ring 2 .
- the resin film 8 includes an outer diameter covering portion 8a that covers the outer diameter surface 6 of the outer ring 2, a chamfered covering portion 8b that covers the chamfered portion 13 of the outer ring 2, and an end surface covering portion that covers the axial end surface 7 of the outer ring 2. 8c.
- the outer diameter covering portion 8a is formed to have a film thickness t (see FIG. 2) of 10 ⁇ m or more (preferably 15 ⁇ m or more) and 50 ⁇ m or less.
- the film thickness t can be set to 20 ⁇ m, for example.
- the end surface covering portion 8c is also formed to have a film thickness of 10 ⁇ m or more (preferably 15 ⁇ m or more) and 50 ⁇ m or less.
- the outer diameter surface 6 (see FIG. 2) of the outer ring 2 is formed so that the surface roughness in the axial direction is Ra 0.1 ⁇ m or more and Ra 0.8 ⁇ m or less.
- the resin film 8 is made of a resin having a coefficient of linear expansion of 6.5 ⁇ 10 ⁇ 5 /° C. or less.
- resins include polyamideimide resin-based resins (having a linear expansion coefficient of 4.0 ⁇ 10 ⁇ 5 /° C. or less) or epoxy resin-based resins (having a linear expansion coefficient of 6.5 ⁇ 10 ⁇ 5 /° C. or less) can be employed.
- a resin having a withstand voltage of 0.01 kV/ ⁇ m or more is used as the resin forming the resin film 8 .
- the outer ring 2 is prepared, and then the inner circumference of the outer ring 2 is masked by fitting a masking member (not shown) to the outer ring shoulder 10 on the inner circumference of the outer ring 2.
- a resin paint prepared by dissolving a resin in a solvent
- a resin coating is formed on the outer diameter surface 6 of the outer ring 2 and the axial end surface 7 of the outer ring 2, and then the resin coating is baked.
- the resin film 8 is formed by this. After forming the resin film 8, the surface of the resin film 8 is not subjected to additional processing such as polishing.
- the outer ring 2, the inner ring 3, the rolling elements 4 and the retainer 5 are assembled.
- the insulating rolling bearing 1 is manufactured by this method, it is possible to efficiently manufacture the insulating rolling bearing 1 having the resin film 8 with a film thickness of 50 ⁇ m or less.
- a method for forming a resin coating film on the outer diameter surface 6 of the outer ring 2 and the axial end surface 7 of the outer ring 2 brush coating, roller coating, or dipping can be used instead of spraying a resin coating in which resin is dissolved in a solvent. It is also possible to employ other methods.
- the insulating rolling bearing 1 described above employs the resin film 8 instead of the ceramic film as the insulating layer, so that the cost is low.
- the film thickness of the resin film 8 in the portion (outer diameter covering portion 8a) covering the outer diameter surface 6 of the outer ring 2 is thin, the film thickness of the resin film 8 does not change due to temperature changes. Due to the expansion of the resin film 8 when small and in a high temperature state, an excessive interference is generated between the outer ring 2 and the housing 14, while in a low temperature state an excessive clearance is generated between the outer ring 2 and the housing 14. can be prevented from occurring. Therefore, when used as a bearing for supporting the rotary shaft 15 of the electric motor of an electric vehicle, the fitting gap between the outer ring 2 and the housing 14 can be appropriately set.
- the insulating rolling bearing 1 has a film thickness of the portion of the resin coating 8 (outer diameter coating portion 8a) covering the outer diameter surface 6 of the outer ring 2 and a thickness of the resin coating 8 covering the axial end face 7 of the outer ring 2. Since the film thickness of the portion (end face covering portion 8c) is 10 ⁇ m or more (preferably 15 ⁇ m or more), the resin film 8 prevents current from passing through the bearing during rotation. can be effectively suppressed. Therefore, electrolytic corrosion can be suppressed, and a significantly longer life can be obtained than a normal bearing without the resin film 8 provided.
- the surface roughness of the outer diameter surface 6 of the outer ring 2 is Ra 0.1 ⁇ m or more, so the adhesive strength of the resin film 8 to the outer diameter surface 6 of the outer ring 2 is high. Further, since the surface roughness of the outer diameter surface 6 of the outer ring 2 is Ra 0.8 ⁇ m or less, when the resin film 8 is formed on the outer diameter surface 6 of the outer ring 2 with a thickness of 50 ⁇ m or less, the surface roughness of the resin film 8 is reduced. The surface roughness is kept small, and the surface of the resin film 8 does not need to be subjected to additional processing such as polishing, resulting in low cost.
- the insulating rolling bearing 1 since the insulating rolling bearing 1 has the resin film 8 formed of a resin having a coefficient of linear expansion of 6.5 ⁇ 10 ⁇ 5 /° C. or less, the change in the film thickness of the resin film 8 due to temperature changes is small. . Therefore, when used as a bearing for supporting the rotary shaft 15 of the electric motor of an electric vehicle, it is possible to particularly effectively suppress changes in the fit gap between the outer ring 2 and the housing 14 depending on the temperature. be.
- a ball bearing using balls as the rolling elements 4 has been described as an example, but the present invention can also be applied to roller bearings using rollers as the rolling elements 4 .
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
外輪と、
前記外輪の径方向内側に同軸に配置される内輪と、
前記外輪と前記内輪の間に組み込まれる複数の転動体と、
前記外輪の外径面と前記外輪の軸方向端面とを被覆する絶縁層と、を有する絶縁転がり軸受において、
前記絶縁層は、前記外輪の外径面を被覆する部分の膜厚が50μm以下の樹脂皮膜であることを特徴とする絶縁転がり軸受。
2 外輪
3 内輪
4 転動体
6 外径面
7 軸方向端面
8 樹脂皮膜
8a 外径被覆部
8c 端面被覆部
t 膜厚
Claims (4)
- 外輪(2)と、
前記外輪(2)の径方向内側に同軸に配置される内輪(3)と、
前記外輪(2)と前記内輪(3)の間に組み込まれる複数の転動体(4)と、
前記外輪(2)の外径面(6)と前記外輪(2)の軸方向端面(7)とを被覆する絶縁層と、を有する絶縁転がり軸受において、
前記絶縁層は、前記外輪(2)の外径面(6)を被覆する部分の膜厚(t)が50μm以下の樹脂皮膜(8)であることを特徴とする絶縁転がり軸受。 - 前記樹脂皮膜(8)は、前記外輪(2)の外径面(6)を被覆する部分の膜厚(t)と、前記外輪(2)の軸方向端面(7)を被覆する部分の膜厚とが10μm以上となるように形成されている請求項1に記載の絶縁転がり軸受。
- 前記外輪(2)の外径面(6)が、Ra0.1μm以上Ra0.8μm以下の面粗さに形成されている請求項1または2に記載の絶縁転がり軸受。
- 前記樹脂皮膜(8)は、6.5×10-5/℃以下の線膨張係数を有する樹脂で形成されている請求項1から3のいずれかに記載の絶縁転がり軸受。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020247004436A KR20240036027A (ko) | 2021-07-20 | 2022-07-13 | 절연 구름 베어링 |
CN202280048649.3A CN117616210A (zh) | 2021-07-20 | 2022-07-13 | 绝缘滚动轴承 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021-119582 | 2021-07-20 | ||
JP2021119582A JP2023015667A (ja) | 2021-07-20 | 2021-07-20 | 絶縁転がり軸受 |
Publications (1)
Publication Number | Publication Date |
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WO2023002891A1 true WO2023002891A1 (ja) | 2023-01-26 |
Family
ID=84979160
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2022/027512 WO2023002891A1 (ja) | 2021-07-20 | 2022-07-13 | 絶縁転がり軸受 |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP2023015667A (ja) |
KR (1) | KR20240036027A (ja) |
CN (1) | CN117616210A (ja) |
WO (1) | WO2023002891A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06147231A (ja) * | 1992-09-24 | 1994-05-27 | Bando Chem Ind Ltd | 電気絶縁軸受 |
JP2007292119A (ja) * | 2006-04-21 | 2007-11-08 | Ntn Corp | 軸受、転動部材および転動部材の製造方法 |
JP2008095884A (ja) * | 2006-10-13 | 2008-04-24 | Ntn Corp | 絶縁転がり軸受 |
JP2021134800A (ja) * | 2020-02-24 | 2021-09-13 | 株式会社ジェイテクト | 転がり軸受 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07208462A (ja) | 1994-01-24 | 1995-08-11 | Ntn Corp | 絶縁転がり軸受 |
JP3538487B2 (ja) | 1995-09-26 | 2004-06-14 | Ntn株式会社 | 樹脂絶縁軸受 |
JPH1037966A (ja) | 1996-07-26 | 1998-02-13 | Ntn Corp | 樹脂絶縁転がり軸受の取付構造およびその軸受 |
JP2003148482A (ja) | 2001-11-07 | 2003-05-21 | Koyo Seiko Co Ltd | 絶縁軸受 |
JP2013174303A (ja) | 2012-02-24 | 2013-09-05 | Nsk Ltd | 電食防止用絶縁転がり軸受 |
JP2015209562A (ja) | 2014-04-25 | 2015-11-24 | Ntn株式会社 | 溶射被膜、及びその形成方法と形成装置、並びに軸受部材 |
JP2020063826A (ja) | 2018-10-19 | 2020-04-23 | 日本精工株式会社 | 転がり軸受 |
-
2021
- 2021-07-20 JP JP2021119582A patent/JP2023015667A/ja active Pending
-
2022
- 2022-07-13 KR KR1020247004436A patent/KR20240036027A/ko unknown
- 2022-07-13 CN CN202280048649.3A patent/CN117616210A/zh active Pending
- 2022-07-13 WO PCT/JP2022/027512 patent/WO2023002891A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06147231A (ja) * | 1992-09-24 | 1994-05-27 | Bando Chem Ind Ltd | 電気絶縁軸受 |
JP2007292119A (ja) * | 2006-04-21 | 2007-11-08 | Ntn Corp | 軸受、転動部材および転動部材の製造方法 |
JP2008095884A (ja) * | 2006-10-13 | 2008-04-24 | Ntn Corp | 絶縁転がり軸受 |
JP2021134800A (ja) * | 2020-02-24 | 2021-09-13 | 株式会社ジェイテクト | 転がり軸受 |
Also Published As
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JP2023015667A (ja) | 2023-02-01 |
CN117616210A (zh) | 2024-02-27 |
KR20240036027A (ko) | 2024-03-19 |
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