WO2013161625A1 - 磁性流体シール付き軸受 - Google Patents
磁性流体シール付き軸受 Download PDFInfo
- Publication number
- WO2013161625A1 WO2013161625A1 PCT/JP2013/061269 JP2013061269W WO2013161625A1 WO 2013161625 A1 WO2013161625 A1 WO 2013161625A1 JP 2013061269 W JP2013061269 W JP 2013061269W WO 2013161625 A1 WO2013161625 A1 WO 2013161625A1
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- WIPO (PCT)
- Prior art keywords
- ring
- magnetic fluid
- bearing
- magnet
- outer ring
- Prior art date
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Classifications
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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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/762—Sealings of ball or roller bearings by means of a fluid
- F16C33/763—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap
- F16C33/765—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap by a magnetic field
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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
- F16C19/06—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
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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
- 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
- F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
- F16C33/7843—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc
- F16C33/7846—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with a gap between the annular disc and the inner race
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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
- 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
- F16C33/7889—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to an inner race and extending toward the outer race
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
Definitions
- the present invention relates to a bearing with a magnetic fluid seal that is disposed in various power transmission mechanisms and rotatably supports a rotating shaft, and prevents foreign matter such as dust and moisture from entering inside.
- a rotating shaft installed in various driving force transmission mechanisms is rotatably supported through a bearing.
- a so-called ball bearing (ball bearing) in which a plurality of rolling elements (rolling members) are accommodated in the circumferential direction between the inner ring and the outer ring is often used as the bearing. By using it, the rotational performance of the rotating shaft is improved.
- Such a bearing is used as a support means for a rotating shaft of a driving force transmission mechanism in various driving devices.
- foreign matter such as dust and moisture can be prevented from entering inside the bearing portion.
- problems such as deterioration in rotational performance and abnormal noise occur.
- a seal member made of an elastic material is brought into contact with the outer periphery of the rotating shaft close to the bearing to make the bearing portion waterproof and dust-proof.
- the seal member made of an elastic material is used. The rotational performance of the rotating shaft is degraded due to the influence of the contact pressure.
- a bearing (referred to as a bearing with a magnetic fluid seal) having a magnetic fluid seal mechanism using a magnetic fluid is known as a configuration for preventing foreign matter from entering the bearing portion without deteriorating the rotational performance of the rotary shaft.
- Patent Document 1 relates to a ball bearing that holds a rolling element between an outer ring and an inner ring, interposing a magnetic body between the outer ring and the inner ring that rotate relative to each other, and fixing one side of the magnetic body, A configuration in which a magnetic fluid is disposed in the seal gap on the other side is disclosed.
- the rolling element is closed by disposing the magnetic body between the inner ring and the outer ring to close the rolling element, fixing one side of the magnetic body, and disposing the magnetic fluid in the seal gap on the other side. Sealed in a sealed state to prevent foreign matter from entering the rolling elements that affect the rotational performance.
- the sealing performance is maintained with respect to dust and a liquid with a certain degree of viscosity, but the sealing performance with respect to a liquid with a low viscosity is sufficient.
- the sealing performance is not maintained. That is, since the magnetic body has lower dimensional accuracy than the members constituting the bearing, the liquid easily enters from one fixed side, and the liquid having a lower viscosity is more likely to enter the rolling element (particularly Seawater dries after intrusion and leaves salt crystals, which leads to deterioration in rotational performance). In this case, if the sealing is surely performed, the productivity is reduced, for example, the size of the magnetic body is precisely controlled or a part for sealing is separately incorporated.
- the present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a bearing with a magnetic fluid seal having a structure excellent in productivity, in which the seal of the inner rolling element portion is reliably maintained. .
- a plurality of rolling elements are interposed between an inner ring and an outer ring, and a ring-shaped magnet is disposed on the opening side of the inner ring and the outer ring to hold a magnetic fluid.
- a ring with a magnetic fluid seal for sealing the plurality of rolling elements, wherein the ring-shaped magnet is magnetized so that a magnetic pole faces in an axial direction, and an axially outer surface of the ring-shaped magnet
- a ring-shaped electrode plate disposed in contact with the outer ring and the outer ring-side magnetic fluid held between the outer ring and the ring-shaped electrode plate and / or between the outer ring and the ring-shaped magnet.
- the ring-shaped magnet is magnetized so that the magnetic pole faces in the axial direction, and is arranged so that the ring-shaped pole plate is in contact with the axially outer surface of the ring-shaped magnet. Therefore, a magnetic fluid (outer ring side magnetic fluid) can be held between the outer ring and the ring-shaped electrode plate and / or between the outer ring and the ring-shaped magnet. A magnetic fluid (inner ring-side magnetic fluid) can be held between the ring-shaped electrode plate and / or between the inner ring and the ring-shaped magnet.
- the magnetic fluid held on the outer peripheral surface on the outer ring side and the outer peripheral surface on the inner ring side as described above may be disposed only on the opening portion on one side of the bearing, or on both side opening portions. It may be arranged.
- a bearing with a magnetic fluid seal having a structure excellent in productivity can be obtained in which the seal of the inner rolling element portion is reliably maintained.
- FIG. 1 and 2 are views showing a first embodiment of a magnetic fluid seal bearing according to the present invention.
- FIG. 1 is a sectional view along an axial direction
- FIG. 2 is an enlarged view of a main part of FIG. is there.
- a magnetic fluid seal bearing (hereinafter also referred to as a bearing) 1 includes a cylindrical inner ring 3, a cylindrical outer ring 5 surrounding the inner ring 3, and an inner ring 3 and an outer ring 5. And a plurality of rolling elements (rolling members) 7.
- the rolling element 7 is held by a retainer (cage) 8 extending in the circumferential direction, and the inner ring 3 and the outer ring 5 are relatively rotatable.
- the inner ring 3, the outer ring 5 and the rolling element 7 are made of a magnetic material, for example, chromium-based stainless steel (SUS440C), and the retainer 8 is made of a material having excellent corrosion resistance and heat resistance, for example, stainless steel (SUS304). Is formed by.
- the rolling element 7 it does not necessarily need to be a magnetic body.
- the outer ring 5 of the present embodiment is configured such that the exposed end surface 5a is the same (may be substantially the same) as the exposed end surface 3a of the inner ring 3, but in the third embodiment described later.
- the outer ring 5 may be formed longer in the axial direction than the inner ring 3 (the outer ring 5 may include an elongated cylindrical portion protruding in the axial direction with respect to the inner ring 3). It may be formed longer in the axial direction.
- a magnetic fluid seal 10 described in detail below is installed on the opening side of the inner ring 3 and the outer ring 5, a magnetic fluid seal 10 described in detail below is installed.
- the magnetic fluid seals having the same configuration are disposed in the openings on both sides of the inner ring 3 and the outer ring 5, and therefore, in the following description, the configuration on one side (left side in FIG. 1) will be described. .
- the magnetic fluid seal 10 includes a ring-shaped magnet (hereinafter referred to as a magnet) 12 and a ring-shaped electrode plate (hereinafter referred to as an electrode plate) disposed in contact with the axially outer surface of the magnet 12. 14 and a magnetic fluid (an outer ring-side magnetic fluid 15a and an inner ring-side magnetic fluid 15b) held in a magnetic circuit formed by the magnet 12, and by these members, in the rolling element 7 It has a function of sealing so that dust, moisture and the like do not enter.
- a magnet ring-shaped magnet
- an electrode plate ring-shaped electrode plate
- a permanent magnet having a high magnetic flux density and a strong magnetic force for example, a neodymium magnet produced by a sintering method can be used.
- FIG. X is magnetized so that the magnetic poles (S pole, N pole) face it.
- the electrode plate 14 is disposed in contact with the outer surface of the magnet 12 in the axial direction.
- the electrode plate 14 has substantially the same shape as the magnet 12, and is made of a magnetic material, for example, chromium-based stainless steel (SUS440C).
- the magnet 12 and the electrode plate 14 are bonded in advance in this embodiment, but may not be bonded. In this case, by pre-bonding the two, the magnet 12 can be easily positioned and centered, and the magnet 12 and the electrode plate 14 are unitized so that an assembling operation as described later can be easily performed. .
- the outer ring-side magnetic fluid 15a and the inner ring-side magnetic fluid 15b are configured by dispersing magnetic fine particles such as Fe3O4 in a surfactant and base oil, and are viscous and react when approaching a magnet. It has. Therefore, the magnetic fluids 15a and 15b are stably held at predetermined positions by a magnetic circuit formed between the magnet 12 and the inner ring 3, the outer ring 5 and the pole plate 14 made of a magnetic material. .
- a step 5b is formed on the inner surface of the outer ring 5 on the rolling element side with respect to the magnet 12, and the step 5c causes the outer ring 5 to have a thin area 5A on the opening side and a thick area 5B on the rolling element side.
- the step 5b is formed so as to generate a gap (step gap) for holding the magnetic fluid.
- the step 5b is formed to be a surface 5c perpendicular to the axial direction ( By using a vertical surface, the magnet 12 can be attracted, positioned and fixed as will be described later.
- the step is not limited to a vertical surface as in this embodiment, and can be formed in a staircase shape as long as the magnetic fluid can be stably held with the magnet 12, It may be formed in an inclined shape (slope). In this case, it is possible to position the magnet 12 and hold the magnetic fluid by using the inclined surface.
- the electrode plate 14 has an outer diameter slightly larger than the inner peripheral surface of the outer ring 5 (the inner peripheral surface of the thin wall region 5A), and is pressed into the opening side of the outer ring 5 together with the bonded magnet 12. It has become so. Further, the electrode plate 14 to which the magnet 12 is bonded is formed in such a size that a predetermined gap G is generated between the electrode plate 14 and the outer ring surface of the inner ring 3 when press-fitted into the outer ring 5. Further, the axial lengths of the magnet 12 and the electrode plate 14 are formed such that a gap G1 is generated with respect to the vertical surface 5c by the step 5b when the magnet 12 and the electrode plate 14 are press-fitted in a state where they are adhered. Yes.
- the inner ring 3 side and the outer ring 5 side are Magnetic fluxes (magnetic circuits 3M and 5M) that are symmetric with respect to the direction are formed. Therefore, the inner ring-side magnetic fluid 15b and the outer ring-side magnetic fluid 15a are held in the gap G between the electrode plate 14 and the inner ring 3 and the gap G1 between the magnet 12 and the outer ring 5, respectively. It becomes possible to make it.
- the magnetic fluid when the magnetic fluid is filled in the gap G with an injection device such as a dropper, the magnetic fluid is held in the gap G by the magnetic circuit 3M, and moves to the gap G1 side as it is and is formed on the outer ring side.
- the circuit 5M also holds the gap G1.
- the bearing 1 having the above-described configuration, a sealing effect is obtained even on the side where the magnet 12 and the electrode plate 14 are fixed (in this embodiment, the inner peripheral surface of the outer ring 5). It is possible to reliably prevent moisture and dust from entering the rolling element 7 side. That is, the conventional bearing with a magnetic fluid seal does not consider the necessity of sealing on the side on which the magnet and the electrode plate are fixed, and the sealing effect on the rolling elements is not sufficient. In addition to the sealing of the inner ring side magnetic fluid 15b, the outer ring side magnetic fluid 15a on the fixed side is also sealed, so that a sufficient sealing effect can be exhibited.
- the magnet 12 that holds the magnetic fluid on both the inner ring side and the outer ring side is configured as one member, and a magnetic fluid seal is formed on the inner ring side and the outer ring side at the same time by lubrication work from one place. Therefore, workability is improved.
- the step 5b is formed in the outer ring 5
- a space (step gap) for effectively holding the magnetic fluid can be formed using the step, and the sealing effect can be easily achieved. Can be increased.
- the outer ring-side magnetic fluid 15 a is held in the gap G ⁇ b> 1, but the gap between the outer peripheral surface of the magnet 12 and the inner peripheral surface of the outer ring 5, or the inner periphery of the electrode plate 14 and the outer ring 5. It is possible to penetrate even a slight gap between the surfaces, and a sufficient sealing function is exhibited on the outer ring side.
- FIG. 3 is a diagram illustrating a modification of the above-described embodiment.
- the electrode plate 14 is configured with the same thickness in the radial direction.
- a portion for holding a magnetic fluid in this embodiment, It is preferable to form a taper so that the thickness gradually decreases toward the inner side in the radial direction (the thin-walled portion is indicated by reference numeral 14A).
- the magnetic fluid 15b does not jump out to the outside in the axial direction (outside from the exposed end surfaces 5a and 3a of the outer ring and the inner ring), the magnetic fluid is prevented from being wiped off during the assembling work. It is possible to perform a stable filling operation.
- FIG. 4 is a diagram showing a second embodiment of the present invention.
- the size of the electrode plate 14 in the radial direction is formed such that some degree of play (gap G2) occurs with respect to the inner peripheral surface of the outer ring 5.
- the magnet 12 is attracted to the vertical surface 5c where the magnet 12 is a step. It will be positioned and fixed by force.
- the magnetic fluid is filled into the gap G and the gap G2 with an injection device such as a syringe, the magnetic fluid is separated by the magnetic circuit 3M from the gap G (the inner ring 3 and the electrode plate 14). And is held in the gap G2 (between the outer ring 5 and the electrode plate 14) by the magnetic circuit 5M.
- the magnetic fluid filled in the gap G moves to the step side as it is and is also held by the step portion between the magnet 12 and the outer ring 5 (between the magnet 12 and the outer ring 5), so that the sealing effect on the outer ring side is achieved. Get higher.
- the work of assembling the electrode plate 14 to which the magnet 12 is bonded can be easily performed, and the direction of the magnet can be easily managed when the opening portions on both sides of the bearing are sealed. Further, since the electrode plate 14 is formed so as to have the gap G2, a deformation load is not applied to the outer ring 3 during the assembling work, and the rotational performance of the bearing is not deteriorated.
- the gap G2 may be set to 10 to 500 ⁇ m, preferably 20 to 200 ⁇ m in consideration of assembling workability and sealing performance.
- FIG. 5 is a diagram showing a modification of the above-described second embodiment.
- a step 3b is formed on the inner ring side
- a surface 3c perpendicular to the axial direction is formed on the inner ring side
- a magnet 12 and a pole plate 14 similar to the configuration shown in FIG. (A structure symmetrical to the structure shown in FIG. 4).
- the bearing having such a configuration has a structure suitable for installation on a member that rotates on the outer ring side.
- the magnet 12 and the electrode plate 14 may be mounted on the inner ring side as in the structure shown in FIG.
- FIG. 6 is a diagram showing a third embodiment of the present invention.
- the outer ring 5 is formed longer in the axial direction than the inner ring 3 to form an elongated cylindrical part 5D that protrudes from the exposed end surface 3a of the inner ring 3, and the elongated cylindrical part 5D has the same configuration as described above.
- a magnetic fluid seal 10 is provided.
- the axial length of the elongated cylindrical portion 5D is the same as that of the exposed end surface 3a of the inner ring 3 in a state where the magnet 12 is attracted to the vertical surface 5c formed by the step 5b on the outer ring side and positioned and fixed.
- the gap G3 is set to be generated between the two. That is, in the configuration of the present embodiment, the size H in the radial direction of the magnet 12 can be increased as compared with the above-described embodiments and modifications, so that the magnetic force can be increased and the sealing performance is increased ( Magnetic fluid retention).
- the magnetic fluid 15b on the inner ring side is on the inner side in the axial direction and is not exposed to the outside, so that it is prevented from being wiped off during assembling work or the like, and a stable filling work can be performed.
- the outer ring 5 side is the elongated cylindrical part, but the inner ring 3 side may be the elongated cylindrical part.
- the surfaces of the inner ring 3 and the outer ring 5 are subjected to electrolytic chromic acid treatment.
- electrolytic chromic acid treatment it is possible to prevent the surface from cracking and tearing due to rust and corrosion, and it is possible to reliably prevent dust and foreign matter from entering the inside. Become.
- a ring-shaped shield may be press-fitted and fixed from the outside in the axial direction to the surface on the outer side in the axial direction of the electrode plate 14 disposed on the opening side.
- a shield can be formed of a material excellent in corrosion resistance and heat resistance, such as stainless steel (SUS304) or resin, and the provision of such a shield makes it more effective to intrude foreign matter. It is possible to effectively prevent magnetic substances (foreign matter) such as iron sand from adhering to the magnet 12.
- a thin washer and a spacer member for positioning may be disposed between the magnet 12 and the outer ring 5 (or the inner ring 3).
- dimensional management is simplified, and it is possible to further improve the assemblability.
- These washers and spacers are preferably made of a magnetic material so that a stable magnetic circuit is formed.
- the bearing provided with the magnetic fluid seal comprised as mentioned above it is possible to install in the rotating shaft part of various apparatuses in which dustproof property and waterproofness are requested
- Example 1 is a handle shaft bearing (rotary shaft) bearing sealed with a generally known rubber packing
- Conventional Example 2 is a magnetic fluid seal.
- Example 1 is described above. 1 and FIG. 2 are provided with the bearing of the embodiment
- Example 2 is provided with the bearing of the embodiment shown in FIG. 4, and Example 3 is shown in FIG. The bearing of the embodiment is installed.
- the rubber packing method (conventional example 1) felt heavy operation because of its large rotational resistance, but the other magnetic fluid seal methods (conventional example 2 and examples 1 to 3) The rotational resistance was small and the operation felt light.
- none of the bearings had a rough feeling during rotation.
- the rough feeling arose. This is because salt water entered the rolling element portion from the unsealed portion, which dried and crystallized.
- the rough feeling was not felt about the prior art example 1, when it repeats experiment for a long period of time and rubber packing begins to deteriorate, compared with Example 1 to 3, a rough feeling is felt early. It is thought to occur.
- a smooth rotation feeling can be obtained over a long period of time.
- the rubber packing method (conventional example 1) takes some time to arrange the rubber packing, and in Example 1, the press-fitting process of the electrode plate 12 is delicate. It took. In addition, since the method of the conventional example 2 is difficult to be unitized, it takes much time to assemble. On the other hand, in the types of Examples 2 and 3, it was only necessary to insert the electrode plate to which the magnet was bonded from the exposed end face side, and it was easy to assemble because the magnet attracting force was used.
- Example 3 the magnetic fluid was in the back, so that it was not accidentally wiped off. Further, in Example 2, the magnetic fluid is slightly behind the opening, so that it is difficult to wipe off. In Example 1 and Conventional Example 2, the magnetic fluid is at the end, so that it may be accidentally wiped off. Yes, care must be taken in terms of handling.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Rolling Contact Bearings (AREA)
- Sealing Of Bearings (AREA)
Abstract
Description
本出願は、日本国特許出願2012-100551(2012年4月26日出願)に基づく優先権を主張し、その内容は参照により全体として本明細書に組み込まれる。
図1及び図2は、本発明に係る磁性流体シール付き軸受の第1の実施形態を示す図であり、図1は軸方向に沿った断面図、図2は図1の要部拡大図である。
図1及び図2に示した実施形態では、極板14は、径方向において同一の肉厚で構成されていたが、図3に示すように、磁性流体を保持する部分(本実施形態では、径方向内側)に向けて次第に薄肉厚となるようにテーパ状に形成しておくことが好ましい(薄肉厚部を符号14Aで示す)。
この実施形態では、極板14の径方向の大きさを、外輪5の内周面に対して多少の遊度(隙間G2)が生じる程度に形成している。
この変形例では、内輪側に段差3bを形成し、ここに軸方向に対して垂直な面3cを形成し、内輪側に、図4に示した構成と同様な磁石12、及び極板14を配設している(図4に示す構造と対称な構造)。
このような構成の軸受では、外輪側が回転する部材に対して設置するのに適した構造となる。
この実施形態では、外輪5を内輪3よりも軸方向に長く形成して、内輪3の露出端面3aから突出する伸長円筒部5Dを形成し、この伸長円筒部5D部分に、上述した構成と同様な磁性流体シール10を配設している。
ここで、スピニングリールのハンドルによって回転駆動される回転軸部分に、上記した各実施形態の軸受を設置したものと、従来の構成の軸受を設置したものについて、夫々塩水を浸漬させた後の回転性能(ハンドルを回転操作したときに感じる滑らかさ)について試験した結果を表1に示す。
3 内輪
3a 露出端面
5 外輪
5b 段差
5c 垂直な面
5a 露出端面
7 転動体
10 磁性流体シール
12 リング状の磁石
14 リング状の極板
15a,15b 磁性流体
G,G1~G3 隙間
Claims (7)
- 内輪と外輪との間に複数の転動体を介装し、前記内輪と外輪の開口側にリング状の磁石を配設して磁性流体を保持し、前記複数の転動体をシールする磁性流体シール付き軸受であって、
前記リングの状磁石は、軸方向に磁極が向くように着磁されており、
前記リング状の磁石の軸方向外側面に接して配置されるリング状の極板と、
前記外輪と前記リング状の極板との間、及び/又は、前記外輪と前記リング状の磁石と
の間に保持される外輪側磁性流体と、
前記内輪と前記リング状の極板との間、及び/又は、前記内輪と前記リング状の磁石との間に保持される内輪側磁性流体と、を有することを特徴とする磁性流体シール付き軸受。 - 前記外輪又は内輪の転動体側内面には、段差が形成されており、
前記段差により、軸方向の外側の内外輪間隔が、内側よりも大きく形成されていること
を特徴とする請求項1に記載の磁性流体シール付き軸受。 - 前記段差による段差面は、前記軸方向に対して垂直な面又は斜面であり、
前記垂直な面又は斜面に、前記リング状の磁石が磁力によって吸着されていることを特徴とする請求項2に記載の磁性流体シール付き軸受。 - 前記リング状の極板の外周面と前記外輪の内周面との間には、隙間が形成されており、
前記隙間内に磁性流体が配されることを特徴とする請求項1に記載の磁性流体シール付き軸受。 - 前記リング状の極板は、前記外輪に対して圧入されると共に、前記リング状の磁石と前記段差との間には、段差隙間が形成されており、
前記段差隙間に磁性流体が配されることを特徴とする請求項1に記載の磁性流体シール付き軸受。 - 前記リング状の磁石は、前記リング状の極板に接着されていることを特徴とする請求項1に記載の磁性流体シール付き軸受。
- 前記内輪及び外輪の表面は、電解クロム酸処理が施されていることを特徴とする請求項1に記載の磁性流体シール付き軸受。
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
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BR122021024766-8A BR122021024766B1 (pt) | 2012-04-26 | 2013-04-16 | Rolamento com vedante de fluido magne'tico |
EP13781951.2A EP2762739B1 (en) | 2012-04-26 | 2013-04-16 | Bearing having magnetic fluid seal |
RU2014108457/11A RU2578628C1 (ru) | 2012-04-26 | 2013-04-16 | Подшипник с магнитожидкостным уплотнением |
EP17157501.2A EP3190301B1 (en) | 2012-04-26 | 2013-04-16 | Bearing with magnetic fluid seal |
CN201380003249.1A CN103842675B (zh) | 2012-04-26 | 2013-04-16 | 具有磁性流体密封件的轴承 |
KR1020147005728A KR101955742B1 (ko) | 2012-04-26 | 2013-04-16 | 자성 유체 시일이 구비된 베어링 |
US14/342,747 US9091302B2 (en) | 2012-04-26 | 2013-04-16 | Bearing with magnetic fluid seal |
US14/726,198 US9546685B2 (en) | 2012-04-26 | 2015-05-29 | Bearing with magnetic fluid seal |
US15/332,655 US9611893B2 (en) | 2012-04-26 | 2016-10-24 | Bearing with magnetic fluid seal |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2012-100551 | 2012-04-26 | ||
JP2012100551A JP5797600B2 (ja) | 2012-04-26 | 2012-04-26 | 磁性流体シール付き軸受 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/342,747 A-371-Of-International US9091302B2 (en) | 2012-04-26 | 2013-04-16 | Bearing with magnetic fluid seal |
US14/726,198 Continuation US9546685B2 (en) | 2012-04-26 | 2015-05-29 | Bearing with magnetic fluid seal |
Publications (1)
Publication Number | Publication Date |
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WO2013161625A1 true WO2013161625A1 (ja) | 2013-10-31 |
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PCT/JP2013/061269 WO2013161625A1 (ja) | 2012-04-26 | 2013-04-16 | 磁性流体シール付き軸受 |
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US (3) | US9091302B2 (ja) |
EP (4) | EP2762739B1 (ja) |
JP (1) | JP5797600B2 (ja) |
KR (1) | KR101955742B1 (ja) |
CN (2) | CN105673709B (ja) |
BR (2) | BR112014005584B1 (ja) |
RU (1) | RU2578628C1 (ja) |
WO (1) | WO2013161625A1 (ja) |
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KR20170072936A (ko) | 2015-10-21 | 2017-06-27 | 퓨어 피싱 재팬 가부시키가이샤 | 낚시용 릴 |
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US20150110427A1 (en) * | 2012-01-26 | 2015-04-23 | Frank Berens | Rolling bearing assembly having magnetic and/or electronic elements |
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2012
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2013
- 2013-04-16 BR BR112014005584-0A patent/BR112014005584B1/pt active IP Right Grant
- 2013-04-16 EP EP13781951.2A patent/EP2762739B1/en active Active
- 2013-04-16 CN CN201610108379.7A patent/CN105673709B/zh active Active
- 2013-04-16 RU RU2014108457/11A patent/RU2578628C1/ru active
- 2013-04-16 BR BR122021024766-8A patent/BR122021024766B1/pt active IP Right Grant
- 2013-04-16 WO PCT/JP2013/061269 patent/WO2013161625A1/ja active Application Filing
- 2013-04-16 EP EP17157501.2A patent/EP3190301B1/en active Active
- 2013-04-16 US US14/342,747 patent/US9091302B2/en active Active
- 2013-04-16 CN CN201380003249.1A patent/CN103842675B/zh active Active
- 2013-04-16 KR KR1020147005728A patent/KR101955742B1/ko active IP Right Grant
- 2013-04-16 EP EP15170607.4A patent/EP2952764B1/en active Active
- 2013-04-16 EP EP15170606.6A patent/EP3009699B1/en active Active
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2016
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JP2015089358A (ja) * | 2013-11-06 | 2015-05-11 | グローブライド株式会社 | 磁性流体シール付き軸受、及び磁性流体シール付き軸受を配設した魚釣用リール |
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Also Published As
Publication number | Publication date |
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EP3009699A1 (en) | 2016-04-20 |
US20170037905A1 (en) | 2017-02-09 |
CN105673709B (zh) | 2018-09-28 |
EP2762739A1 (en) | 2014-08-06 |
US9546685B2 (en) | 2017-01-17 |
EP2952764A1 (en) | 2015-12-09 |
KR20150005899A (ko) | 2015-01-15 |
EP3190301A1 (en) | 2017-07-12 |
EP2952764B1 (en) | 2018-02-14 |
CN103842675A (zh) | 2014-06-04 |
US9611893B2 (en) | 2017-04-04 |
CN105673709A (zh) | 2016-06-15 |
BR112014005584B1 (pt) | 2022-06-28 |
JP2013228044A (ja) | 2013-11-07 |
US20160061263A1 (en) | 2016-03-03 |
US9091302B2 (en) | 2015-07-28 |
EP3190301B1 (en) | 2018-12-26 |
CN103842675B (zh) | 2016-04-13 |
EP2762739B1 (en) | 2016-04-13 |
JP5797600B2 (ja) | 2015-10-21 |
EP3009699B1 (en) | 2017-04-26 |
EP2762739A4 (en) | 2015-05-06 |
KR101955742B1 (ko) | 2019-03-07 |
RU2578628C1 (ru) | 2016-03-27 |
US20150063733A1 (en) | 2015-03-05 |
BR122021024766B1 (pt) | 2023-03-14 |
BR112014005584A2 (pt) | 2017-06-13 |
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