JP2012159114A - Sealing structure for turning bearing - Google Patents

Sealing structure for turning bearing Download PDF

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JP2012159114A
JP2012159114A JP2011017766A JP2011017766A JP2012159114A JP 2012159114 A JP2012159114 A JP 2012159114A JP 2011017766 A JP2011017766 A JP 2011017766A JP 2011017766 A JP2011017766 A JP 2011017766A JP 2012159114 A JP2012159114 A JP 2012159114A
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seal
bearing
seal lip
seal member
ring
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JP5781318B2 (en
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Kengo Hiramatsu
研吾 平松
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a sealing structure for a turning bearing, capable of effectively preventing the leak-out of grease sealed in a bearing inside space.SOLUTION: The turning bearing includes an inner ring 1 and an outer ring 2 as bearing rings, a plurality of rolling elements 3, and a pair of elastic-material seal members 12 for sealing both axial ends of the bearing inside space 5, respectively. For example, the inner ring 1 is one bearing ring, and the outer ring 2 is the other bearing ring. The seal member 12 has a base part 12a fixed to the inner ring 1, extends from the base part 12a toward the outer ring 2, and has a seal lip part 12c at the tip, contacting a first contacted face 11a formed by the face of the outer ring 2 across the axial direction. The outer ring 2 is provided with a second contacted face 11b formed of a peripheral face extending from the end on the opposite side to one bearing ring in the first contacted face 11a, to the outside in the axial direction. The seal lip part 12 being deflected to the outside in the axial direction contacts the second contacted face 11b.

Description

この発明は、風力発電装置や各種機械等の旋回部に用いられる旋回軸受のシール構造に関する。   The present invention relates to a seal structure for a slewing bearing used in a slewing part of a wind power generator or various machines.

従来の一般的な旋回軸受は、例えば図6に示すように、軌道輪である内輪1および外輪2と、これら内外輪1,2間に介在する複数の転動体3と、各転動体3を円周方向に等間隔に保持する保持器4と、内外輪1,2間の軸受内部空間5に封入されたグリースの漏れを防ぐためのシール部材22とを有する。シール部材22は弾性材料からなり、内外輪1,2のいずれか一方の軌道輪の周面における軸方向の端部に形成された凹形状のシール取付溝20に基部22aを嵌め込んで固定され、この基部22aから他方の軌道輪に向けて延びるシールリップ部22bの先端が他方の軌道輪の側面に、締め代を持った状態、すなわち押し当てられて若干弾性変形した状態で接触している。図6(B)の拡大図に示す軸受内部空間5の下側のシール構造の場合、基部22aを嵌め込むのが外輪2であり、シールリップ部22bを接触させるのが内輪1である。   For example, as shown in FIG. 6, a conventional general slewing bearing includes an inner ring 1 and an outer ring 2 that are race rings, a plurality of rolling elements 3 interposed between the inner and outer rings 1 and 2, and each rolling element 3. It has a cage 4 which is held at equal intervals in the circumferential direction, and a seal member 22 for preventing leakage of grease sealed in the bearing inner space 5 between the inner and outer rings 1 and 2. The seal member 22 is made of an elastic material, and is fixed by fitting a base portion 22a into a concave seal mounting groove 20 formed at an end portion in the axial direction on the circumferential surface of one of the inner and outer rings 1 and 2. The tip of the seal lip portion 22b extending from the base portion 22a toward the other raceway is in contact with the side surface of the other raceway in a state having a tightening margin, that is, pressed and slightly elastically deformed. . In the lower seal structure of the bearing internal space 5 shown in the enlarged view of FIG. 6B, the outer ring 2 is fitted into the base 22a, and the inner ring 1 is brought into contact with the seal lip 22b.

上記従来のシール構造では、グリースを追加給脂するとき等に、軸受内部空間5の圧力上昇によってシール部材22のシールリップ部22bが軸方向外側に開き、中のグリースが漏れ出すことがあった。この対策として、下記の先行技術がある。特許文献1は、軸受内部空間から漏れたグリースを掻き落として、グリース受けに保持するようにした技術である。また、特許文献2は、軸受内部空間の圧力が上昇すると、シールリップ部の締め代が増加してグリース漏れを抑えるようにした技術である。   In the above conventional seal structure, when additional grease is supplied, the seal lip 22b of the seal member 22 opens outward in the axial direction due to the pressure increase in the bearing internal space 5, and the grease inside may leak out. . As countermeasures, there are the following prior arts. Patent Document 1 is a technique in which grease leaked from the bearing internal space is scraped off and held in a grease receiver. Patent Document 2 is a technique in which when the pressure in the bearing internal space increases, the tightening allowance of the seal lip increases to suppress grease leakage.

特開平7−208484号公報JP 7-208484 A 特許第4179432号公報Japanese Patent No. 4179432 実開昭63−115629号公報Japanese Utility Model Publication No. 63-115629

特許文献1の技術は、漏れ出したグリースの処理であって、グリース漏れ自体を防ぐものではない。特許文献2の技術は、シール部材の取付部(基部)が、内外輪のいずれか一方の軌道輪に設けた円環状の凹溝(シール取付溝)にしっかりと固定されているうえに、本体部の剛性が高いため、シール部材全体が変形することはほとんど無いと考えられる。しかし、リップ部(シールリップ部)は、他方の軌道輪の側面に接触しているだけにすぎないので、軸受内部空間の圧力が高くなると、リップ部の締め代が増加する工夫がされていても、リップ部全体が軸方向外側へ押し出されるため、グリースの漏れ出しを完全に防ぐことはできないと考えられる。この点については、特許文献2の先行技術である特許文献3と大差無いと推定できる。   The technique of Patent Document 1 is processing of leaked grease, and does not prevent grease leakage itself. The technique of Patent Document 2 is that the mounting portion (base portion) of the seal member is firmly fixed to an annular concave groove (seal mounting groove) provided in either of the inner and outer rings, and the main body Since the rigidity of the part is high, it is considered that the entire seal member is hardly deformed. However, since the lip portion (seal lip portion) is only in contact with the side surface of the other race ring, when the pressure in the bearing internal space increases, the lip portion tightening allowance increases. However, since the entire lip portion is pushed outward in the axial direction, it is considered that leakage of grease cannot be completely prevented. About this point, it can be estimated that there is no big difference with patent document 3 which is a prior art of patent document 2.

この発明の目的は、軸受内部空間に封入されたグリースの漏れ出しを効果的に防ぐことができる旋回軸受のシール構造を提供することである。   An object of the present invention is to provide a seal structure for a slewing bearing capable of effectively preventing leakage of grease sealed in a bearing internal space.

この発明の旋回軸受のシール構造は、軌道輪である内輪および外輪にそれぞれ軌道溝が形成され、これら内外輪の軌道溝間に複数の転動体が設けられ、内外輪における軸受内部空間の軸方向の両端をそれぞれ封止する一対の弾性体製のシール部材を備えたシール構造において、前記シール部材は、前記内外輪のいずれか一方の軌道輪に基部が固定され、この基部から他方の軌道輪に向けて延び、その先端のシールリップ部が、前記他方の軌道輪における軸方向と交差する面からなる第1の被接触面に接触し、前記他方の軌道輪に、前記第1の被接触面における前記一方の軌道輪と反対側端から軸方向外側へ延びる周面からなる第2の被接触面を設け、前記シールリップ部が軸方向外側へ撓んだ状態で同シールリップ部を前記第2の被接触面に接触させるようにしたことを特徴とする。   In the seal structure of the slewing bearing according to the present invention, a raceway groove is formed in each of the inner ring and the outer ring, which are raceways, and a plurality of rolling elements are provided between the raceways of the inner and outer races. In the sealing structure including a pair of elastic sealing members that seal both ends of the sealing member, a base portion of the sealing member is fixed to any one of the inner and outer races, and the other raceway from the base portion. The seal lip portion at the tip of the second contact ring contacts a first contacted surface that is a surface intersecting the axial direction of the other track ring, and the first track contact contacts the first contacted ring. A second contacted surface comprising a circumferential surface extending outward in the axial direction from the opposite end of the one raceway on the surface, and the seal lip portion is bent in the axially outward state when the seal lip portion is bent outward in the axial direction. On the second contacted surface Characterized in that as make touch.

この構成によると、通常時は、シール部材のシールリップ部が他方の軌道輪の第1の被接触面に接触しているが、軸受内部空間の圧力が高まると、シールリップ部が軸方向外側へ撓んで他方の軌道輪の第2の被接触面に接触する。このため、軸受内部空間の圧力変化に関係無く、常に軸受内部空間が密封された状態に保たれ、軸受内部空間に封入されたグリースの漏れ出しが防がれる。   According to this configuration, normally, the seal lip portion of the seal member is in contact with the first contact surface of the other bearing ring, but when the pressure in the bearing internal space increases, the seal lip portion is axially outside. To the second contact surface of the other race. For this reason, the bearing inner space is always kept sealed regardless of the pressure change in the bearing inner space, and leakage of the grease sealed in the bearing inner space is prevented.

この発明において、前記シール部材のシールリップ部は、他方の軌道輪に向けて径方向に延びる径方向部分と、この径方向部分の先端部から前記第1の被接触面に向かって軸方向に延びる軸方向部分とを有し、この軸方向部分の先端が前記第1の被接触面に接触するのが良い。
シールリップ部を上記形状とすると、軸受内部空間の圧力が高まってシールリップ部が軸方向外側へ撓むとき、シールリップ部の軸方向部分は他方の軌道輪の側へ移動し、この軸方向部分が前記第2の被接触面に良好に接触する。
In this invention, the seal lip portion of the seal member includes a radial portion extending in a radial direction toward the other race ring, and an axial direction from a distal end portion of the radial portion toward the first contacted surface. It is good to have an axial direction part extended, and the front-end | tip of this axial direction part contacts the said 1st to-be-contacted surface.
When the seal lip portion has the above shape, when the pressure in the bearing internal space increases and the seal lip portion bends outward in the axial direction, the axial portion of the seal lip portion moves toward the other bearing ring. The portion makes good contact with the second contacted surface.

この発明において、前記他方の軌道輪の前記一方の軌道輪と対向する周面に、前記シール部材のシールリップ部が嵌り込む環状のシールリップ溝を設け、このシールリップ溝の軸方向内側の壁面を前記第1の被接触面とし、かつ底面を前記第2の被接触面としても良い。
この構成の場合、シールリップ溝の軸方向外側の壁面によりシールリップ部の軸方向の動きが拘束される。そのため、軸受内部空間の圧力が極度に高まった場合でも、シールリップ部が外側に押し出されず、軸受内部空間内のグリースが一気に漏れ出すのを防げる。
In the present invention, an annular seal lip groove into which a seal lip portion of the seal member is fitted is provided on a peripheral surface of the other race ring facing the one race ring, and a wall surface on the inner side in the axial direction of the seal lip groove. May be the first contacted surface, and the bottom surface may be the second contacted surface.
In the case of this configuration, the axial movement of the seal lip portion is restricted by the axially outer wall surface of the seal lip groove. Therefore, even when the pressure in the bearing internal space is extremely increased, the seal lip portion is not pushed outward, and the grease in the bearing internal space can be prevented from leaking at a stretch.

この発明において、前記シール部材に前記軸受内部空間からの圧力が作用しない状態で、前記シールリップ部と前記第2の被接触面との最短の径方向距離を0.3mmないし0.6mmの範囲内とするのが望ましい。
シールリップ部と第2の被接触面との最短の径方向距離、すなわちラジアルすきまが大きすぎると、シールリップ部が第1の被接触面に接触する状態から第2の被接触面に接触する状態に切り換わる過程で、シールリップ部が第1の被接触面および第2の被接触面のどちらとも接触しない状態が生じてしまう。そのため、ラジアルすきまは、限りなく零に近いのが理想である。しかし、実際には製造誤差等があるため、ラジアルすきまを小さくしすぎると、シールリップ部が第1の被接触面および第2の被接触面の両方に同時に接触することが起こりうる。この場合、シール摺動トルクの増大や過大発熱の要因となってしまう。そこで、シール部材のシールリップ部や、他方の軌道輪の第1の被接触面および第2の被接触面の製造誤差を考慮して、ラジアルすきまを上記値に設定した。
In the present invention, the shortest radial distance between the seal lip portion and the second contacted surface is in a range of 0.3 mm to 0.6 mm in a state in which no pressure from the bearing internal space acts on the seal member. It is desirable to be inside.
If the shortest radial distance between the seal lip portion and the second contacted surface, that is, the radial clearance is too large, the seal lip portion comes into contact with the second contacted surface from the state in contact with the first contacted surface. In the process of switching to the state, a state occurs in which the seal lip portion does not come into contact with either the first contacted surface or the second contacted surface. Therefore, the radial clearance is ideally as close to zero as possible. However, since there is actually a manufacturing error or the like, if the radial clearance is too small, the seal lip portion may contact both the first contacted surface and the second contacted surface at the same time. In this case, the seal sliding torque increases and excessive heat is generated. Therefore, the radial clearance is set to the above value in consideration of manufacturing errors of the seal lip portion of the seal member and the first contact surface and the second contact surface of the other race.

この発明において、前記一方の軌道輪の側面にシール取付凹部を設け、このシール取付凹部に前記シール部材の基部を嵌め込んで固定しても良い。
この構成の場合、一方の軌道輪の周面にシール取付凹部を設ける場合に比べて、一方の軌道輪の軸方向長さを短くできる。
In the present invention, a seal mounting recess may be provided on a side surface of the one bearing ring, and a base portion of the seal member may be fitted and fixed to the seal mounting recess.
In the case of this configuration, the axial length of one of the bearing rings can be shortened compared to the case where the seal mounting recess is provided on the peripheral surface of one of the bearing rings.

この発明において、前記シール部材の前記軸受内部空間を向く面に、グリース溜りとなる凹み部を設けても良い。
この構成の場合、軸受内部空間からグリースが漏れ出しても、その漏れ出したグリースをシール部材の凹み部にある程度保持することができる。そのため、仮にグリースがシール部材の外側へ漏れ出したとしても、大半のグリースは凹み部に保持されているので、グリースが完全に失われることを防げる。
In this invention, you may provide the recessed part used as a grease pool in the surface which faces the said bearing internal space of the said sealing member.
In the case of this configuration, even if grease leaks from the bearing internal space, the leaked grease can be held to some extent in the recess of the seal member. Therefore, even if the grease leaks to the outside of the seal member, most of the grease is held in the recessed portion, so that the grease can be prevented from being completely lost.

この発明において、前記軸受内部空間の軸方向端の開口幅のうちの径方向寸法で1/2以上の範囲を、前記シール部材で遮蔽しても良い。
この構成の場合、軸受内部空間の端部にラビリンスが構成され、軸受内部空間からのグリースの漏れ出しを抑制することができる。
In this invention, a range of 1/2 or more in the radial dimension of the opening width at the axial end of the bearing internal space may be shielded by the seal member.
In the case of this configuration, a labyrinth is formed at the end of the bearing internal space, and leakage of grease from the bearing internal space can be suppressed.

この発明において、前記シール部材における前記シールリップ部よりも前記基部側の箇所に、周辺箇所よりも肉厚の薄い薄肉部を設けても良い。
薄肉部が設けられていると、軸受内部空間からの大きな圧力がシール部材に作用した場合、薄肉部を基点にしてシールリップ部を含むシール部材の部分が変形し、前記圧力を逃がす。そのため、シール部材の基部が一方の軌道輪から外れることを防げる。
In this invention, you may provide the thin part thinly thinner than a peripheral location in the location of the said base part side rather than the said seal lip part in the said sealing member.
When the thin wall portion is provided, when a large pressure from the bearing internal space acts on the seal member, the portion of the seal member including the seal lip portion is deformed with the thin wall portion as a base point, and the pressure is released. Therefore, it can prevent that the base part of a sealing member remove | deviates from one track ring.

この発明において、前記シール部材に、前記他方の軌道輪における前記第1の被接触側面よりも軸方向外側の箇所に接触して、前記軸受内部空間への異物の侵入を防ぐダストリップ部を設けても良い。
この構成の場合、軸受外部から軸受内部空間へのゴミ等の異物の侵入を防ぐことができると共に、さらなるグリース漏れ防止効果が期待できる。
In this invention, the seal member is provided with a dust lip portion that contacts a portion on the outer side in the axial direction with respect to the first contacted side surface of the other race ring and prevents foreign matter from entering the bearing internal space. May be.
In the case of this configuration, foreign matter such as dust can be prevented from entering the bearing internal space from the outside of the bearing, and further grease leakage preventing effect can be expected.

この発明の旋回軸受のシール構造は、軌道輪である内輪および外輪にそれぞれ軌道溝が形成され、これら内外輪の軌道溝間に複数の転動体が設けられ、内外輪における軸受内部空間の軸方向の両端をそれぞれ封止する一対の弾性体製のシール部材を備えたシール構造において、前記シール部材は、前記内外輪のいずれか一方の軌道輪に基部が固定され、この基部から他方の軌道輪に向けて延び、その先端のシールリップ部が、前記他方の軌道輪における軸方向と交差する面からなる第1の被接触面に接触し、前記他方の軌道輪に、前記第1の被接触面における前記一方の軌道輪と反対側端から軸方向外側へ延びる周面からなる第2の被接触面を設け、前記シールリップ部が軸方向外側へ撓んだ状態で同シールリップ部を前記第2の被接触面に接触させるようにしたため、軸受内部空間に封入されたグリースの漏れ出しを効果的に防ぐことができる。   In the seal structure of the slewing bearing according to the present invention, a raceway groove is formed in each of the inner ring and the outer ring, which are raceways, and a plurality of rolling elements are provided between the raceways of the inner and outer races. In the sealing structure including a pair of elastic sealing members that seal both ends of the sealing member, a base portion of the sealing member is fixed to any one of the inner and outer races, and the other raceway from the base portion. The seal lip portion at the tip of the second contact ring contacts a first contacted surface that is a surface intersecting the axial direction of the other track ring, and the first track contact contacts the first contacted ring. A second contacted surface comprising a circumferential surface extending outward in the axial direction from the opposite end of the one raceway on the surface, and the seal lip portion is bent in the axially outward state when the seal lip portion is bent outward in the axial direction. On the second contacted surface Because you to make touch, it is possible to prevent the leakage of grease sealed in the bearing internal space effectively.

(A)はこの発明の一実施形態にかかるシール構造を備えた旋回軸受の断面図、(B)はそのシール構造の拡大図である。(A) is sectional drawing of the turning bearing provided with the seal structure concerning one Embodiment of this invention, (B) is an enlarged view of the seal structure. (A),(B)はシール構造の動作説明図である。(A), (B) is operation | movement explanatory drawing of a seal structure. この発明の異なる実施形態にかかるシール構造を示す断面図である。It is sectional drawing which shows the seal structure concerning different embodiment of this invention. この発明のさらに異なる実施形態にかかるシール構造を示す断面図である。It is sectional drawing which shows the seal structure concerning further different embodiment of this invention. この発明のさらに異なる実施形態にかかるシール構造を示す断面図である。It is sectional drawing which shows the seal structure concerning further different embodiment of this invention. (A)は従来のシール構造を備えた旋回軸受の断面図、(B)はそのシール構造の拡大図である。(A) is sectional drawing of the slewing bearing provided with the conventional seal structure, (B) is an enlarged view of the seal structure.

この発明の一実施形態を図1と共に説明する。この旋回軸受は、軌道輪である内輪1および外輪2と、これら内外輪1,2の各軌道溝1a,2a間に転動自在に介在する複数の転動体3と、各転動体3を円周方向に並ぶポケット4a内にそれぞれ保持する保持器4とを備える。内輪1および外輪2には、それぞれ他の部材へ連結固定するための軸方向の貫通孔1b,2bが、円周方向一定間隔おきに複数設けられている。   An embodiment of the present invention will be described with reference to FIG. This slewing bearing includes an inner ring 1 and an outer ring 2 that are race rings, a plurality of rolling elements 3 that are freely rollable between the race grooves 1 a and 2 a of the inner and outer rings 1 and 2, and each rolling element 3. And cages 4 respectively held in pockets 4a arranged in the circumferential direction. The inner ring 1 and the outer ring 2 are each provided with a plurality of axial through holes 1b, 2b that are connected and fixed to other members at regular intervals in the circumferential direction.

旋回軸受は、例えば4点接触玉軸受として構成される。その場合、内外輪1,2の各軌道溝1a,2aを構成する2つの曲面は、転動体3よりも曲率半径が大きく、曲率中心が互いに異なるゴシックアーチ状の断面円弧状とされる。各転動体3は、内輪1の軌道溝1aおよび外輪2の軌道溝2aの前記各曲面に接点で接して4点接触する。   The slewing bearing is configured as a four-point contact ball bearing, for example. In this case, the two curved surfaces constituting the raceway grooves 1a and 2a of the inner and outer rings 1 and 2 have a Gothic arch-shaped cross-sectional arc shape having a radius of curvature larger than that of the rolling element 3 and different centers of curvature. Each rolling element 3 is in contact with the curved surfaces of the raceway groove 1a of the inner ring 1 and the raceway groove 2a of the outer ring 2 at a contact point and makes contact at four points.

この旋回軸受は、内輪1と外輪2間の軸受内部空間5にグリースを封入して使用される。軸受内部空間5の上下両端は、グリース漏れを防ぐシール構造とされている。図例では、内輪1の上端面は外輪2の上端面よりも高く形成され、かつ外輪2の下端面は内輪1の下端面よりも低く形成されている。そして、外輪2の上端面に環状溝からなるシール取付凹部10が形成されると共に、内輪1の外周面における上端近傍に環状のシールリップ溝11が形成され、これらシール取付凹部10とシールリップ溝11を利用してシール部材12を設けることで、上側のシール構造とされている。
同様に、内輪1の下端面に環状溝からなるシール取付凹部10が形成されると共に、外輪2の内周面における下端近傍に環状のシールリップ溝11が形成され、これらシール取付凹部10とシールリップ溝11を利用してシール部材12を設けることで、下側のシール構造とされている。
上記シールリップ溝11の形式により、その側壁部分で、内輪1および外輪2に、シール部材11のシールリップ部11cを軸方向外側から覆う覆い部1c,2cが形成されている。
This slewing bearing is used by enclosing grease in a bearing inner space 5 between the inner ring 1 and the outer ring 2. The upper and lower ends of the bearing internal space 5 have a seal structure that prevents grease leakage. In the illustrated example, the upper end surface of the inner ring 1 is formed higher than the upper end surface of the outer ring 2, and the lower end surface of the outer ring 2 is formed lower than the lower end surface of the inner ring 1. A seal mounting recess 10 made of an annular groove is formed on the upper end surface of the outer ring 2, and an annular seal lip groove 11 is formed in the vicinity of the upper end of the outer peripheral surface of the inner ring 1, and the seal mounting recess 10 and the seal lip groove are formed. 11 is used to provide the seal member 12, thereby forming an upper seal structure.
Similarly, a seal mounting recess 10 made of an annular groove is formed on the lower end surface of the inner ring 1, and an annular seal lip groove 11 is formed near the lower end of the inner peripheral surface of the outer ring 2. By providing the seal member 12 using the lip groove 11, a lower seal structure is formed.
Due to the form of the seal lip groove 11, cover portions 1 c and 2 c that cover the seal lip portion 11 c of the seal member 11 from the outside in the axial direction are formed on the inner ring 1 and the outer ring 2 at the side walls.

図1(B)は、下側のシール構造を示す。シール部材12は、ゴム等の弾性体製であり、前記シール取付凹部10に嵌め込んで固定される基部12aと、この基部12aと一体で内輪1の下端面に接する本体部12bと、この本体部12bから外輪2に向けて延びるシールリップ部12cとで構成される。さらに、シールリップ部12cは、外輪2に向けて径方向に延びる径方向部分12caと、この径方向部分12caの先端部から上向き湾曲にして軸方向に延びる軸方向部分12cbとで構成される。   FIG. 1B shows the lower seal structure. The seal member 12 is made of an elastic body such as rubber, and has a base portion 12a that is fitted and fixed in the seal mounting recess 10, a main body portion 12b that is integrated with the base portion 12a and contacts the lower end surface of the inner ring 1, and the main body. The seal lip portion 12c extends from the portion 12b toward the outer ring 2. Further, the seal lip portion 12c includes a radial portion 12ca that extends in the radial direction toward the outer ring 2, and an axial portion 12cb that curves upward from the distal end portion of the radial portion 12ca and extends in the axial direction.

シール部材12に軸受内部空間5の圧力が作用しない状態で、シールリップ部12cの軸方向部分12cbの先端は、前記シールリップ溝11の軸方向内側(下側のシール構造の場合、上側)の壁面からなる第1の被接触面11aに、締め代を持った状態で接触している。また、シールリップ部12cの軸方向部分12cbの先端は、シールリップ溝11の底面からなる第2の被接触面11bに近接している。第2の被接触面11bは、第1の被接触面11aにおける内輪1と反対側端から軸方向外側へ延びる周面である。シールリップ部11cと第2の被接触面11bとの最短の径方向距離、すなわちラジアルすきまδ(図2(A))は、0.3mmないし0.6mmの範囲内に設定してある。この根拠については、後で説明する。   In a state where the pressure in the bearing internal space 5 does not act on the seal member 12, the tip of the axial portion 12cb of the seal lip portion 12c is on the axially inner side of the seal lip groove 11 (upper side in the case of the lower seal structure). The first contacted surface 11a made of a wall surface is in contact with a tightening margin. Further, the tip end of the axial direction portion 12 cb of the seal lip portion 12 c is close to the second contacted surface 11 b formed by the bottom surface of the seal lip groove 11. The second contacted surface 11b is a peripheral surface that extends outward in the axial direction from the end opposite to the inner ring 1 in the first contacted surface 11a. The shortest radial distance between the seal lip portion 11c and the second contacted surface 11b, that is, the radial clearance δ (FIG. 2A) is set within a range of 0.3 mm to 0.6 mm. The basis for this will be described later.

シール部材12は、本体部12bからシールリップ部12cにかけて、肉厚が徐々に薄く形成されている。したがって、シールリップ部12cは、本体部12bよりも肉厚が薄い。上記肉厚の変化は、軸受内部空間5を向く側の肉を切除してなされたものであり、それにより、シール部材12の軸受内部空間5を向く面に、グリース溜りとなる凹み部13が形成されている。   The seal member 12 is formed so as to gradually become thinner from the main body portion 12b to the seal lip portion 12c. Accordingly, the seal lip portion 12c is thinner than the main body portion 12b. The change in the wall thickness is made by cutting away the wall facing the bearing internal space 5, so that a recess 13 serving as a grease reservoir is formed on the surface of the seal member 12 facing the bearing internal space 5. Is formed.

上側のシール構造も、基本的に上記下側のシール構造と同じである。上側のシール構造の場合、請求項で言うところの一方の軌道輪が外輪2となり、他方の軌道輪が内輪1となる。上側のシール構造では、シールリップ部12cの軸方向部分12cbが、径方向部分12caの先端部から下向き湾曲にして軸方向に延びている。   The upper seal structure is basically the same as the lower seal structure. In the case of the upper seal structure, one of the bearing rings referred to in the claims becomes the outer ring 2 and the other bearing ring becomes the inner ring 1. In the upper seal structure, the axial portion 12cb of the seal lip portion 12c extends in the axial direction with a downward curve from the distal end portion of the radial portion 12ca.

上記旋回軸受のシール構造の動作を、下側のシール構造を例にとって説明する。
通常時は、図2(A)に示すように、シール部材12のシールリップ部12cが他方の軌道輪である外輪2の第1の被接触面11aに接触している。つまり、シールリップ部12cがアキシアル接触している。軸受内部空間5の圧力が高まると、図2(B)に示すように、シールリップ部12cが軸方向外側へ撓んで外輪2の第2の被接触面11bに接触する。つまり、シールリップ部12cがラジアル接触する。このように、軸受内部空間5の圧力変化に応じて、シールリップ部12cがアキシアル接触とラジアル接触とに切り換わることにより、常に軸受内部空間5が密封された状態に保たれ、軸受内部空間5に封入されたグリースの漏れ出しが防がれる。
The operation of the seal structure of the slewing bearing will be described by taking the lower seal structure as an example.
2A, the seal lip portion 12c of the seal member 12 is in contact with the first contacted surface 11a of the outer ring 2, which is the other raceway ring. That is, the seal lip portion 12c is in axial contact. When the pressure in the bearing internal space 5 increases, the seal lip portion 12c bends outward in the axial direction and contacts the second contacted surface 11b of the outer ring 2 as shown in FIG. That is, the seal lip portion 12c comes into radial contact. As described above, the seal lip portion 12c is switched between the axial contact and the radial contact according to the pressure change in the bearing inner space 5, so that the bearing inner space 5 is always kept in a sealed state. Leakage of grease sealed in is prevented.

シール部材12のシールリップ部12cは、径方向に延びる径方向部分12caと、この径方向部分12caの先端部から第1の被接触面12aに向かって軸方向に延びる軸方向部分12cbとを有し、この軸方向部分12cbの先端が第1の被接触面12aに接触する形状とされている。それにより、軸受内部空間5の圧力が高まってシールリップ部12cが軸方向外側へ撓むとき、シールリップ部12cの軸方向部分12cbは他方の軌道輪である外輪2の側へ移動し、この軸方向部分12cbが第2の被接触面11bに良好に接触する。   The seal lip portion 12c of the seal member 12 has a radial portion 12ca extending in the radial direction and an axial portion 12cb extending in the axial direction from the tip end portion of the radial portion 12ca toward the first contacted surface 12a. The tip of the axial portion 12cb is shaped to contact the first contacted surface 12a. Thereby, when the pressure in the bearing inner space 5 increases and the seal lip portion 12c bends outward in the axial direction, the axial portion 12cb of the seal lip portion 12c moves to the outer ring 2 side which is the other raceway ring. The axial portion 12cb makes good contact with the second contacted surface 11b.

シール部材12に軸受内部空間5からの圧力が作用しない状態で、シールリップ部12cと第2の被接触面11bとのラジアルすきまδは0.3mmないし0.6mmの範囲内とされている。それは以下の理由による。すなわち、ラジアルすきまδが大きすぎると、シールリップ部12cがアキシアル接触からラジアル接触に切り換わる過程で、シールリップ部12cが第1の被接触面11aおよび第2の被接触面11bのどちらとも接触しない状態が生じてしまう。そのため、ラジアルすきまδは、限りなく零に近いのが理想である。しかし、実際には製造誤差等があるため、ラジアルすきまδを小さくしすぎると、シールリップ部12cが第1の被接触面11aおよび第2の被接触面11bの両方に同時に接触することが起こりうる。この場合、シール摺動トルクの増大や過大発熱の要因となってしまう。そこで、シール部材12のシールリップ部12cや、第1の被接触面11aおよび第2の被接触面11bの製造誤差を考慮して、ラジアルすきまδを上記値に設定してある。   In a state where the pressure from the bearing internal space 5 does not act on the seal member 12, the radial clearance δ between the seal lip portion 12c and the second contacted surface 11b is in the range of 0.3 mm to 0.6 mm. The reason is as follows. That is, if the radial clearance δ is too large, the seal lip portion 12c is in contact with both the first contacted surface 11a and the second contacted surface 11b in the process of switching the seal lip portion 12c from the axial contact to the radial contact. A state that does not occur. Therefore, the radial clearance δ is ideally as close to zero as possible. However, since there is actually a manufacturing error or the like, if the radial clearance δ is made too small, the seal lip portion 12c may simultaneously contact both the first contacted surface 11a and the second contacted surface 11b. sell. In this case, the seal sliding torque increases and excessive heat is generated. Therefore, the radial clearance δ is set to the above value in consideration of manufacturing errors of the seal lip portion 12c of the seal member 12, the first contacted surface 11a, and the second contacted surface 11b.

シール部材12のシールリップ部12cはシールリップ溝11に嵌り込んでおり、シールリップ溝11の軸方向外側の壁面11c(図1)によりシールリップ部12cの軸方向の動きが拘束される。そのため、軸受内部空間5の圧力が極度に高まった場合でも、シールリップ部12cが外側に押し出されず、軸受内部空間5内のグリースが一気に漏れ出すのを防げる。   The seal lip portion 12 c of the seal member 12 is fitted in the seal lip groove 11, and the axial movement of the seal lip portion 12 c is restricted by the axially outer wall surface 11 c (FIG. 1) of the seal lip groove 11. Therefore, even when the pressure in the bearing internal space 5 is extremely increased, the seal lip portion 12c is not pushed outward, and the grease in the bearing internal space 5 can be prevented from leaking all at once.

シール部材12は、その基部12aを、一方の軌道輪、例えば内輪1の側面に設けられたシール取付凹部10に嵌め込んで固定されている。この構成とすると、一方の軌道輪の周面にシール部材の基部を固定するための凹部を設ける場合に比べて、一方の軌道輪の軸方向長さを短くできる。   The seal member 12 is fixed by fitting its base 12a into a seal mounting recess 10 provided on one side of the raceway, for example, the inner ring 1. With this configuration, the axial length of one of the race rings can be shortened compared to the case where a recess for fixing the base portion of the seal member is provided on the peripheral surface of the one race ring.

シール部材12の軸受内部空間5を向く面に、グリース溜りとなる凹み部13が設けられているため、軸受内部空間5からグリースが漏れ出しても、その漏れ出したグリースを凹み部13にある程度保持することができる。そのため、仮にグリースがシール部材12の外側へ漏れ出したとしても、大半のグリースは凹み部13に保持されているので、グリースが完全に失われることを防げる。   Since a recess 13 serving as a grease reservoir is provided on the surface of the seal member 12 facing the bearing internal space 5, even if grease leaks from the bearing internal space 5, the leaked grease enters the recess 13 to some extent. Can be held. Therefore, even if the grease leaks to the outside of the seal member 12, most of the grease is held in the recess 13, so that the grease can be prevented from being completely lost.

図3はこの発明の異なる実施形態を示す。このシール構造は、軸受内部空間5の軸方向端の開口幅Hのうちの径方向寸法で1/2以上の範囲を、シール部材12の本体部12bで遮蔽した構成とされている。この構成の場合、軸受内部空間5の端部にラビリンス14が構成され、軸受内部空間5からのグリースの漏れ出しを抑制することができる。   FIG. 3 shows a different embodiment of the invention. This seal structure is configured such that a range of ½ or more in the radial dimension of the opening width H at the axial end of the bearing internal space 5 is shielded by the main body portion 12 b of the seal member 12. In the case of this configuration, the labyrinth 14 is configured at the end of the bearing internal space 5, and leakage of grease from the bearing internal space 5 can be suppressed.

図4はこの発明のさらに異なる実施形態を示す。このシール構造は、シール部材12におけるシールリップ部12cよりも基部12a側の箇所である本体部12bの一部に、周辺箇所よりも肉厚の薄い薄肉部15が設けられている。この例では、薄肉部15は、軸方向内側にスリット状の切込み15aを入れることにより形成されている。薄肉部15が設けられていると、軸受内部空間5からの大きな圧力がシール部材12に作用した場合、薄肉部15を基点にしてシールリップ部12cを含むシール部材12の部分が変形し、前記圧力を逃がす。そのため、シール部材12の基部12aが一方の軌道輪、例えば内輪1から外れることを防げる。   FIG. 4 shows yet another embodiment of the present invention. In this seal structure, a thin portion 15 having a thickness thinner than that of the peripheral portion is provided in a part of the main body portion 12b which is a portion on the base portion 12a side of the seal lip portion 12c in the seal member 12. In this example, the thin portion 15 is formed by inserting a slit-shaped cut 15a on the inner side in the axial direction. When the thin portion 15 is provided, when a large pressure from the bearing internal space 5 acts on the seal member 12, the portion of the seal member 12 including the seal lip portion 12c is deformed from the thin portion 15 as a base point. Relieve pressure. Therefore, the base 12a of the seal member 12 can be prevented from coming off from one of the race rings, for example, the inner ring 1.

図5はこの発明のさらに異なる実施形態を示す。このシール構造は、シール部材12に、シールリップ部12cとは別に、本体部12bから軸方向外側かつ他方の軌道輪、例えば外輪2の側へ延びるダストリップ12dが設けられている。このダストリップ部12dの先端は、外輪2の内周面における第1の被接触側面11aよりも軸方向外側の箇所に接触している。この構成とすることにより、軸受外部から軸受内部空間5へのゴミ等の異物の侵入を防ぐことができると共に、さらなるグリース漏れ防止効果が期待できる。   FIG. 5 shows a further embodiment of the present invention. In this seal structure, a dust strip 12d is provided on the seal member 12 apart from the seal lip portion 12c, extending from the main body portion 12b in the axial direction and toward the other race ring, for example, the outer ring 2 side. The tip of the dust lip 12 d is in contact with a portion on the outer side in the axial direction of the inner peripheral surface of the outer ring 2 relative to the first contacted side surface 11 a. With this configuration, foreign matter such as dust can be prevented from entering the bearing internal space 5 from the outside of the bearing, and a further grease leakage preventing effect can be expected.

1…内輪(軌道輪)
1a…軌道溝
2…外輪(軌道輪)
2a…軌道溝
3…転動体
5…軸受内部空間
10…シール取付凹部
11…シールリップ溝
11a…第1の被接触面
11b…第2の被接触面
12…シール部材
12a…基部
12c…シーリップ部
12ca…径方向部分
12cb…軸方向部分
12d…ダストリップ部
13…凹み部
15…薄肉部
1 ... Inner ring (Raceway)
1a ... Track groove 2 ... Outer ring (Raceway)
2a ... raceway groove 3 ... rolling element 5 ... bearing inner space 10 ... seal mounting recess 11 ... seal lip groove 11a ... first contacted surface 11b ... second contacted surface 12 ... seal member 12a ... base 12c ... seal lip part 12 ca ... radial part 12 cb ... axial part 12 d ... dust lip 13 ... dent 15 ... thin part

Claims (9)

軌道輪である内輪および外輪にそれぞれ軌道溝が形成され、これら内外輪の軌道溝間に複数の転動体が設けられ、内外輪における軸受内部空間の軸方向の両端をそれぞれ封止する一対の弾性体製のシール部材を備えた旋回軸受のシール構造において、
前記シール部材は、前記内外輪のいずれか一方の軌道輪に基部が固定され、この基部から他方の軌道輪に向けて延び、その先端のシールリップ部が、前記他方の軌道輪における軸方向と交差する面からなる第1の被接触面に接触し、
前記他方の軌道輪に、前記第1の被接触面における前記一方の軌道輪と反対側端から軸方向外側へ延びる周面からなる第2の被接触面を設け、前記シールリップ部が軸方向外側へ撓んだ状態で同シールリップ部を前記第2の被接触面に接触させるようにしたことを特徴とする旋回軸受のシール構造。
A pair of elastic rings are formed in each of the inner and outer rings, which are the race rings, and a plurality of rolling elements are provided between the race grooves of the inner and outer rings to seal axial ends of the bearing inner space in the inner and outer rings. In the seal structure of the slewing bearing provided with the body-made seal member,
The seal member has a base fixed to any one of the inner and outer races, extends from the base toward the other race, and a seal lip at the tip of the seal member extends in the axial direction of the other race. Contacting a first contacted surface comprising intersecting surfaces;
The other raceway is provided with a second contacted surface comprising a circumferential surface extending outward in the axial direction from an end opposite to the one raceway on the first contacted surface, and the seal lip portion is axially provided. A seal structure for a slewing bearing, wherein the seal lip portion is brought into contact with the second contacted surface while being bent outward.
請求項1おいて、前記シール部材のシールリップ部は、他方の軌道輪に向けて径方向に延びる径方向部分と、この径方向部分の先端部から前記第1の被接触面に向かって軸方向に延びる軸方向部分とを有し、この軸方向部分の先端が前記第1の被接触面に接触する旋回軸受のシール構造。   The seal lip portion of the seal member according to claim 1, wherein the seal lip portion includes a radial portion extending in a radial direction toward the other bearing ring, and a shaft extending from a distal end portion of the radial portion toward the first contacted surface. And an axial portion extending in a direction, and a seal structure for a slewing bearing in which a tip of the axial portion is in contact with the first contacted surface. 請求項1または請求項2において、前記他方の軌道輪の前記一方の軌道輪と対向する周面に、前記シール部材のシールリップ部が嵌り込む環状のシールリップ溝を設け、このシールリップ溝の軸方向内側の壁面を前記第1の被接触面とし、かつ底面を前記第2の被接触面とした旋回軸受のシール構造。   3. An annular seal lip groove into which a seal lip portion of the seal member is fitted is provided on a peripheral surface of the other race ring facing the one race ring. A seal structure for a slewing bearing having an axially inner wall surface as the first contacted surface and a bottom surface as the second contacted surface. 請求項1ないし請求項3のいずれか1項において、前記シール部材に前記軸受内部空間からの圧力が作用しない状態で、前記シールリップ部と前記第2の被接触面との最短の径方向距離を0.3mmないし0.6mmの範囲内とした旋回軸受のシール構造。   4. The shortest radial distance between the seal lip portion and the second contacted surface according to claim 1, wherein pressure from the bearing internal space does not act on the seal member. 5. A seal structure for a slewing bearing with a diameter of 0.3 mm to 0.6 mm. 請求項1ないし請求項4のいずれか1項において、前記一方の軌道輪の側面にシール取付凹部を設け、このシール取付凹部に前記シール部材の基部を嵌め込んで固定した旋回軸受のシール構造。   The seal structure of the slewing bearing according to any one of claims 1 to 4, wherein a seal mounting recess is provided on a side surface of the one bearing ring, and a base portion of the seal member is fitted and fixed in the seal mounting recess. 請求項1ないし請求項5のいずれか1項において、前記シール部材の前記軸受内部空間を向く面に、グリース溜りとなる凹み部を設けた旋回軸受のシール構造。   6. The seal structure for a slewing bearing according to claim 1, wherein a recess portion serving as a grease reservoir is provided on a surface of the seal member facing the bearing internal space. 請求項1ないし請求項6のいずれか1項において、前記軸受内部空間の軸方向端の開口幅のうちの径方向寸法で1/2以上の範囲を、前記シール部材で遮蔽した旋回軸受のシール構造。   7. The seal of the slewing bearing according to claim 1, wherein a range of ½ or more in the radial dimension of the opening width of the axial end of the bearing internal space is shielded by the seal member. Construction. 請求項1ないし請求項7のいずれか1項において、前記シール部材における前記シールリップ部よりも前記基部側の箇所に、周辺箇所よりも肉厚の薄い薄肉部を設けた旋回軸受のシール構造。   8. The seal structure for a slewing bearing according to claim 1, wherein a thin portion having a thickness smaller than that of a peripheral portion is provided at a location closer to the base portion than the seal lip portion of the seal member. 請求項1ないし請求項8のいずれか1項において、前記シール部材に、前記他方の軌道輪における前記第1の被接触側面よりも軸方向外側の箇所に接触して、前記軸受内部空間への異物の侵入を防ぐダストリップ部を設けた旋回軸受のシール構造。   The contact member according to any one of claims 1 to 8, wherein the seal member is brought into contact with a location outside the first contact side surface in the other raceway in an axial direction to the bearing inner space. A seal structure for a slewing bearing provided with a dust lip that prevents foreign material from entering.
JP2011017766A 2011-01-31 2011-01-31 Slewing bearing seal structure Expired - Fee Related JP5781318B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103967929A (en) * 2014-04-18 2014-08-06 洛阳轴研科技股份有限公司 Double-row ball-shaped ship used loop wheel machine turntable bearing
CN104006071A (en) * 2014-05-26 2014-08-27 中机洛阳轴承科技有限公司 Overall four-point contact ball bearing with seal
CN113586600A (en) * 2021-07-23 2021-11-02 江苏大学 Novel double-layer dustproof and leakproof sealed turntable bearing

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JPH01102246U (en) * 1987-12-26 1989-07-10
JPH041724U (en) * 1990-04-19 1992-01-08
JPH07269576A (en) * 1994-03-30 1995-10-17 Shin Caterpillar Mitsubishi Ltd Seal structure of rotating bearing
JP2003214446A (en) * 2002-01-22 2003-07-30 Hitachi Constr Mach Co Ltd Turning bearing of construction machine
JP2007016868A (en) * 2005-07-06 2007-01-25 Komatsu Ltd Sealing device and its assembling method

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JPS62196254U (en) * 1986-06-02 1987-12-14
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JPH041724U (en) * 1990-04-19 1992-01-08
JPH07269576A (en) * 1994-03-30 1995-10-17 Shin Caterpillar Mitsubishi Ltd Seal structure of rotating bearing
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103967929A (en) * 2014-04-18 2014-08-06 洛阳轴研科技股份有限公司 Double-row ball-shaped ship used loop wheel machine turntable bearing
CN104006071A (en) * 2014-05-26 2014-08-27 中机洛阳轴承科技有限公司 Overall four-point contact ball bearing with seal
CN113586600A (en) * 2021-07-23 2021-11-02 江苏大学 Novel double-layer dustproof and leakproof sealed turntable bearing
CN113586600B (en) * 2021-07-23 2022-07-22 江苏大学 Novel double-layer dustproof and leakproof sealed turntable bearing

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