WO2005085664A1 - 転動要素 - Google Patents
転動要素 Download PDFInfo
- Publication number
- WO2005085664A1 WO2005085664A1 PCT/JP2005/002793 JP2005002793W WO2005085664A1 WO 2005085664 A1 WO2005085664 A1 WO 2005085664A1 JP 2005002793 W JP2005002793 W JP 2005002793W WO 2005085664 A1 WO2005085664 A1 WO 2005085664A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- rolling element
- roller
- rolling
- oxygen
- Prior art date
Links
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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/34—Rollers; Needles
-
- 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
- F16C33/30—Parts of ball or roller bearings
Definitions
- the present invention relates to a rolling element used for a solid lubricated rolling bearing used in a severe environment such as a vacuum, radiation, a high temperature, or a corrosive atmosphere. What is a rolling element?
- Rollers balls, inner rings, outer rings, and other elements that compose two opposing surfaces that support rolling motion.
- the rolling members have a variable load-bearing performance. It has been proposed for the purpose of forming a lubricating coating that has no sticking, has a long life, and improves reliability. It is formed by coating molybdenum disulfide on the rolling surface where the mating member comes into rolling contact.
- the lubricating coating is formed of a molybdenum disulfide coating having a composition selected so that the molecular weight ratio S / Mo of sulfur to molybdenum is 1.7 or more and less than 2.0.
- the technique described above is disclosed (for example, see Patent Document 1).
- the prior art states that the solid lubricating film has a hill-like and dense structure, has an effect of improving load-bearing performance and extending the life of the film.
- Patent Document 1 JP-A-6-272715
- the present invention has been made in view of such a problem, and an object of the present invention is to provide a long-life rolling element that prevents a solid lubricating film from breaking and peeling from a root portion.
- Means for solving the problem [0004] Generally, the adhesion between a metal and a sulfide is very weak. Strength The adhesion between metal and oxide is strong. Taking advantage of this difference, it was found that when oxygen was added to the sulfide in an appropriate amount range (atomic concentration 5-30%), the adhesion was improved.
- the thickness of the boundary layer also has an optimum value. If the thickness is too small, the adhesion to the base becomes insufficient, and if the thickness is too large, the friction increases.
- the optimum value of the thickness of the boundary layer differs depending on the constituent elements of the solid lubricant film, and there is a value determined for each material. In the case of molybdenum disulfide, it was found that 0.01-0.2 ⁇ m is the optimum value.
- the invention according to claim 1 is a rolling element coated with a solid lubricating film made of a molybdenum disulfide sputtered film, wherein the solid lubricating film is made up of at least two layers and is included in a boundary layer close to the base.
- the atomic concentration of oxygen is 5-30%, and the atomic concentration of oxygen contained in the upper layer is 3% or less.
- the thickness of the boundary layer is set to 0.01-0.2 / im.
- the solid lubricating film adheres firmly to the base via the boundary layer, so that the solid lubricating film is hardly broken and the life of the rolling element can be prolonged.
- the solid lubricating film adheres firmly to the substrate while keeping the friction low, so that the life of the rolling elements can be extended.
- FIG. 1 shows a rolling element 1 to which the present invention is applied, (a) is a front view thereof, and (b) is a side view thereof.
- FIG. 2 is an enlarged view of a rolling element to which the present invention is applied.
- FIG. 3 is a configuration diagram of a sputtering apparatus used in the present example.
- FIG. 4 shows a roller rolling jig used in the present embodiment, wherein (a) is a top view thereof, and (b) is a side sectional view taken along line AA of (a).
- Garden 5 This is a rolling test machine used in the present embodiment, where (a) is a side view and (b) is a plan view of (a).
- FIG. 1 shows a rolling element applied to the present invention, in which (a) is a front view and (b) is a side view.
- FIG. 2 is an enlarged view showing a cross section of the solid lubricating film portion.
- a rolling element 1 has a configuration in which a roller 2 made of a steel material is coated with a solid lubricating film 3 having a thickness of about lxm and a sputtered molybdenum disulfide film.
- the solid lubricating film 3 is divided into two layers, a boundary layer 3A corresponding to the interface with the roller 2 and an upper layer 3B.
- the boundary layer 3A contains 5-30% of oxygen, and the upper layer 3B The point is that oxygen is contained in an atomic concentration of 3% or less.
- “below” includes 0%, but in the sputtering method, even if care is taken that oxygen does not enter the film, at most about 1% is mixed.
- the rolling element is a roller, but the same effect can be obtained if the solid lubricating film of the present invention is used. Therefore, it is clear that the rolling element may be a ball, an inner ring, or an outer ring.
- the rolling elements are made of a steel base material, but also include stainless steel such as bearing steel SUS440C.
- FIG. 3 is a configuration diagram of a sputtering apparatus used in the present embodiment
- FIG. 4 is a roller rolling jig used in the present embodiment
- (a) is a top view thereof
- (b) is an A of (a).
- a cross-sectional view along line A is shown.
- 11 is a roller rolling jig
- 12 is a rotating disk
- 13 is a fixed disk
- 15 is a fixed rod
- 16 is a spacer ball
- 21 is a force sword
- 22 is a target
- 26 is a vacuum chamber
- 27 Is a substrate holder
- 33 is a vacuum pump
- 34 is an RF power supply
- 35 is a vacuum gauge
- 36 is an argon cylinder
- 37 is an oxygen cylinder
- 38 is a mass flow controller.
- the rolling element of the present invention is formed by a sputter device shown in FIG. Roller (material: SUS440C) coated with a two-layer solid lubricating film mainly composed of molybdenum disulfide as a layered structural material.
- a target 22 which is a plate material of molybdenum disulfide, is placed on a power source 21 of an RF power supply 34 inside a vacuum chamber 26 made of stainless steel for securing a vacuum state, and a roller is placed on an upper part of the substrate holder 27.
- the rolling jig 11 is placed, the roller 2 is placed in the roller rolling jig 11, the roller 2 is rolled, and molybdenum disulfide as a target material is formed on the cylindrical surface of the roller 2 by sputtering.
- the sputtering apparatus includes an argon cylinder 36 and an oxygen cylinder 37 for introducing gas into the vacuum chamber 26 outside the vacuum chamber 26 so that oxygen is contained in the boundary layer of the solid lubricating film of the roller 2. By introducing these gases into the film, the boundary layer of the solid lubricating film can contain oxygen.
- the outside of the vacuum chamber 26 is provided with a vacuum gauge 35 for measuring the degree of vacuum in the vacuum chamber 26, and a vacuum pump 33 composed of a rotary vacuum pump and a cryopump for evacuating the vacuum chamber 26.
- the roller rolling jig 11 was used as described below, so that the molybdenum disulfide film containing the constituent elements could be uniformly coated on the cylindrical surface of the roller 2.
- the roller rolling jig 11 includes a rotating disk 12 and a fixed disk 13 as shown in FIG. 3, and the rotating disk 12 is coaxially connected to the substrate holder 27. Although it rotates, the fixed disk 13 is fixed to the vacuum chamber 26 by the fixed rod 15, so that even if the substrate holder 27 rotates, it does not rotate.
- the roller 2 is placed on the slit of the rotating disc 12 and the Since the spacers 16 are alternately placed in the space defined by the surfaces, the roller 2 is pushed by the rotating disk 12 that is around it by rotating the substrate holder 27, and the predetermined rotation is performed. Revolves and revolves in number of turns.
- a two-layer molybdenum disulfide film was uniformly formed on the cylindrical surface of the roller 2.
- the composition of the film and the thickness of the boundary layer were measured by XPS.
- a film having a total thickness of 1 ⁇ m was formed by changing the amount of oxygen contained in the boundary layer and the upper layer.
- the thickness of the boundary layer is about 0.1 m.
- the lifetimes of these samples were examined with a mouth-on-disk type membrane life tester shown in FIG. 5A and 5B show a rolling test machine used in this embodiment, wherein FIG. 5A is a side view and FIG. 5B is a plan view of FIG. 5A.
- 50 is a disk
- 51 is a ball
- 53 is a honoreda
- 54 is an arm
- 55 is a dead weight
- 56 is a load sensor
- 57 is a motor.
- the roller 2 as a rolling element is held in a roller holder 53 with four balls in contact with the corners of the roller 2, and a load is applied by a dead weight 55 above the roller holder 53.
- the load cell 56 monitors the frictional force generated by the rotation of the contacting disk 50.
- the test conditions were a rolling speed of about 8 m / min, a load of 1.5 N, and a humidity of about 10% RH.
- the service life was evaluated by the mileage when the load cell output became 0.8N or more.
- Table 1 shows the results of film composition analysis and the life of each sample. Regardless of the sample, the life of the sample whose oxygen concentration in the upper layer was set to 3% or less was less than 3000 m.
- the solid lubricating film has at least two layers and is included in the boundary layer close to the base.
- the atomic concentration of oxygen is specified in the range of 5-30%, and the atomic concentration of oxygen contained in the upper layer is specified to be 3% or less. Adhesion makes it hard to break, and can extend the life of the rolling element.
- the thickness of the boundary layer is set at 0.01-0.2 ⁇ , and the solid lubricating film adheres firmly to the substrate while keeping the friction low, so that the life of the rolling elements is extended. Can be longer.
- the solid lubricating film Longevity is achieved by making the solid lubricating film at least two layers, the atomic concentration of oxygen contained in the boundary layer is 5-30%, the upper layer is 3% or less, and the thickness of the boundary layer is 0.01-0.2 m Since the bearing life can be reduced, the bearing part can be completely sealed and replacement of the bearing is not allowed, or it can be applied to applications such as a completely maintenance-free device.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Physical Vapour Deposition (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/514,269 US20060291762A1 (en) | 2004-03-04 | 2006-09-01 | Rolling element |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004059922A JP2005249066A (ja) | 2004-03-04 | 2004-03-04 | 転動要素 |
JP2004-059922 | 2004-03-04 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/514,269 Continuation-In-Part US20060291762A1 (en) | 2004-03-04 | 2006-09-01 | Rolling element |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005085664A1 true WO2005085664A1 (ja) | 2005-09-15 |
Family
ID=34917999
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/002793 WO2005085664A1 (ja) | 2004-03-04 | 2005-02-22 | 転動要素 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060291762A1 (ja) |
JP (1) | JP2005249066A (ja) |
KR (1) | KR20060125857A (ja) |
TW (1) | TW200540344A (ja) |
WO (1) | WO2005085664A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007332993A (ja) * | 2006-06-12 | 2007-12-27 | Kyushu Institute Of Technology | 固体潤滑軸受 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11509580A (ja) * | 1995-07-19 | 1999-08-24 | テール コーティングズ リミティッド | 硫化モリブデンの付着方法 |
JP2002276667A (ja) * | 2001-03-19 | 2002-09-25 | Yaskawa Electric Corp | 転動要素の製造方法 |
JP2003120695A (ja) * | 1993-05-28 | 2003-04-23 | Nsk Ltd | 摺動部材 |
JP2003222136A (ja) * | 2002-01-31 | 2003-08-08 | Yaskawa Electric Corp | 転動要素 |
JP2004115826A (ja) * | 2002-09-24 | 2004-04-15 | Shojiro Miyake | 硬質炭素皮膜摺動部材及びその製造方法 |
-
2004
- 2004-03-04 JP JP2004059922A patent/JP2005249066A/ja active Pending
-
2005
- 2005-02-22 WO PCT/JP2005/002793 patent/WO2005085664A1/ja active Application Filing
- 2005-02-22 KR KR1020067016403A patent/KR20060125857A/ko not_active Application Discontinuation
- 2005-03-03 TW TW094106468A patent/TW200540344A/zh unknown
-
2006
- 2006-09-01 US US11/514,269 patent/US20060291762A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003120695A (ja) * | 1993-05-28 | 2003-04-23 | Nsk Ltd | 摺動部材 |
JPH11509580A (ja) * | 1995-07-19 | 1999-08-24 | テール コーティングズ リミティッド | 硫化モリブデンの付着方法 |
JP2002276667A (ja) * | 2001-03-19 | 2002-09-25 | Yaskawa Electric Corp | 転動要素の製造方法 |
JP2003222136A (ja) * | 2002-01-31 | 2003-08-08 | Yaskawa Electric Corp | 転動要素 |
JP2004115826A (ja) * | 2002-09-24 | 2004-04-15 | Shojiro Miyake | 硬質炭素皮膜摺動部材及びその製造方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007332993A (ja) * | 2006-06-12 | 2007-12-27 | Kyushu Institute Of Technology | 固体潤滑軸受 |
JP4644817B2 (ja) * | 2006-06-12 | 2011-03-09 | 国立大学法人九州工業大学 | 固体潤滑軸受 |
Also Published As
Publication number | Publication date |
---|---|
JP2005249066A (ja) | 2005-09-15 |
TW200540344A (en) | 2005-12-16 |
US20060291762A1 (en) | 2006-12-28 |
KR20060125857A (ko) | 2006-12-06 |
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