JP5735387B2 - Roller bearing - Google Patents

Roller bearing Download PDF

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Publication number
JP5735387B2
JP5735387B2 JP2011207740A JP2011207740A JP5735387B2 JP 5735387 B2 JP5735387 B2 JP 5735387B2 JP 2011207740 A JP2011207740 A JP 2011207740A JP 2011207740 A JP2011207740 A JP 2011207740A JP 5735387 B2 JP5735387 B2 JP 5735387B2
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roller bearing
diameter side
bearing according
ring raceway
cage
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JP2013068282A (en
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中川　勉
勉 中川
雅 西村
雅 西村
真司 大石
真司 大石
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NTN Corp
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NTN Corp
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Description

この発明は、遊星歯車減速装置に用いて好適なころ軸受に関する。   The present invention relates to a roller bearing suitable for use in a planetary gear reduction device.

ころ軸受２１は、図４〜図６に示すように、内周面に円筒形の外輪軌道２２を有する外方部材２３と、外周面に円筒形の内輪軌道２４を有する内方部材２５と、これら外輪軌道２２と内輪軌道２４との間に転動自在に設けた複数のころ２６とからなる。   As shown in FIGS. 4 to 6, the roller bearing 21 includes an outer member 23 having a cylindrical outer ring raceway 22 on an inner peripheral surface, an inner member 25 having a cylindrical inner ring raceway 24 on an outer peripheral surface, A plurality of rollers 26 are provided between the outer ring raceway 22 and the inner ring raceway 24 so as to roll freely.

ころ２６は、全体が円筒状に形成された保持器２７に転動自在に保持されている。保持器２７は、周方向に所定間隔でころ２６を収容するポケット２８を有し、周方向に隣り合う各ポケット２８間に柱部２９と、柱部２９の軸方向の両側に円環部３０とを備えている。   The roller 26 is rotatably held by a cage 27 that is formed in a cylindrical shape as a whole. The cage 27 has pockets 28 for accommodating the rollers 26 at a predetermined interval in the circumferential direction, a column portion 29 between the pockets 28 adjacent in the circumferential direction, and an annular portion 30 on both sides in the axial direction of the column portion 29. And.

保持器２７の柱部２９には、内径側と外径側とに、ころ２６の抜け落ちを防止する内側突起部３１と外側突起部３２を設けている。   The pillar portion 29 of the cage 27 is provided with an inner protrusion portion 31 and an outer protrusion portion 32 that prevent the rollers 26 from falling off on the inner diameter side and the outer diameter side.

例えば、柱部２９の軸方向中間部と軸方向両端の３か所には、径方向内外に延びる油道３３Ａ、３３Ｂが、内側突起部３１と外側突起部３２が形成された部分を除いて設けられる。そして、保持器２７の径方向内側から外側に遠心力によって潤滑油を前記各油道３３Ａ、３３Ｂを介して流通させることにより、潤滑油の流れやころ軸受２１内における潤滑油の油量を確保している。   For example, oil passages 33A and 33B extending inward and outward in the radial direction are provided at three locations on the axial intermediate portion and both axial ends of the column portion 29, except for a portion where the inner protrusion portion 31 and the outer protrusion portion 32 are formed. Provided. The lubricating oil is circulated from the radially inner side to the outer side of the cage 27 by the centrifugal force through the oil passages 33A and 33B, thereby ensuring the flow of the lubricating oil and the amount of the lubricating oil in the roller bearing 21. doing.

このように構成されるころ軸受２１は、例えば、遊星歯車減速装置の各減速歯車機構における遊星歯車（外方部材２３）を支持ピン（内方部材２５）によって軸支する場合に使用される。   The roller bearing 21 configured as described above is used, for example, when the planetary gear (outer member 23) in each reduction gear mechanism of the planetary gear reduction device is supported by a support pin (inner member 25).

特に、建機等で使用される大型の減速歯車装置では、重荷重条件と取付け誤差を考慮して、ころ２６には、外周面の中央がストレートで、その両側が両端に向かって径がなだらかに小さくなるようにクラウニング加工したクラウニング部からなるクラウニング付きのものが使用される。   In particular, in a large reduction gear device used in a construction machine or the like, in consideration of heavy load conditions and installation errors, the roller 26 has a straight center at the outer peripheral surface and a gentle diameter toward both ends. A thing with a crowning which consists of a crowning part crowned so that it may become small is used.

ところで、ポケット２８内の潤滑油の流れが悪いと、潤滑油に含まれる金属摩耗粉等の塵埃が内側突起部３１や外側突起部３２の部分で滞留しやすく、金属摩耗粉によってころ２６の外表面が損傷し易い。   By the way, if the flow of the lubricating oil in the pocket 28 is poor, dust such as metal wear powder contained in the lubrication oil is likely to stay in the inner protruding portion 31 and the outer protruding portion 32, and the metal wear powder removes the roller 26 from the roller 26. The surface is easily damaged.

また、クラウニング付きころの場合には、ストレート部に掛かる面圧が大きくなり、ストレート部の領域で油膜切れを起こしやすい。   Further, in the case of a roller with a crowning, the surface pressure applied to the straight portion increases, and the oil film is likely to be cut off in the region of the straight portion.

特に近年、歯車減速装置メーカではコスト削減の流れから、歯車の仕上げ加工の省略等で表面粗さが大きくなっており、歯車のかみ合いにより粗さの突起が脱落するなどして、多量の摩耗粉が発生しているケースも多々見受けられる。したがって、金属摩耗粉によるころの摩耗を防止することが重要な課題になっている。   Particularly in recent years, gear reducer manufacturers have increased the surface roughness due to the omission of gear finishing due to cost reductions, and the projections of the roughness have fallen off due to gear meshing. There are many cases where this occurs. Therefore, it has become an important issue to prevent roller wear due to metal wear powder.

このような摩耗粉対策として、特許文献１には、ポケット２８の柱部９の壁面に、異物や摩耗粉を流通させる逃がし溝３６を設けるということが示されている。   As a countermeasure against such abrasion powder, Patent Document 1 discloses that a relief groove 36 for circulating foreign matter and abrasion powder is provided on the wall surface of the column portion 9 of the pocket 28.

特開２００１−４１２５０号公報JP 2001-41250 A

ところが、上記のように、柱部９の壁面に周方向に凹む深さＫの逃がし溝３６を設けた場合、図６に示すように、外径側の柱部９の幅ｂに対し、内径側の柱部９の幅ａが狭くなり、柱部９の強度が弱くなるという問題があった。   However, when the relief groove 36 having a depth K recessed in the circumferential direction is provided on the wall surface of the column portion 9 as described above, the inner diameter is larger than the width b of the column portion 9 on the outer diameter side as shown in FIG. There was a problem that the width a of the column 9 on the side became narrow and the strength of the column 9 was weakened.

そこで、この発明は、保持器の柱部の強度を確保しつつ、潤滑油の流通を良好にして、ころ軸受の長寿命化を図ることを課題とするものである。   SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the life of a roller bearing by ensuring the flow of lubricating oil while securing the strength of a pillar portion of a cage.

前記の課題を解決するために、この発明は、内周面に円筒形の外輪軌道を有する外方部材と、外周面に円筒形の内輪軌道を有する内方部材と、これら外輪軌道と内輪軌道との間に転動自在に設けた複数のころと、ころを周方向に所定間隔で収容保持するポケットを有する全体が円筒状で、周方向に隣り合う各ポケット間に柱部と、この柱部の軸方向の両側に円環部を備える保持器とからなり、ポケットの柱部の内径側と外径側とに、ころの抜け落ちを防止する内側突起部と外側突起部を設け、この内側突起部と外側突起部が形成された部分を除いた部分に径方向内外に延びる油道を設け、ポケットの柱部の壁面に、周方向に凹む逃がし溝を設けたころ軸受において、柱部の逃がし溝の深さを、外径側から内径側に向かって浅くしたことを特徴とする。
In order to solve the above-described problems, the present invention provides an outer member having a cylindrical outer ring raceway on an inner peripheral surface, an inner member having a cylindrical inner ring raceway on an outer peripheral surface, and the outer ring raceway and the inner ring raceway. And a plurality of rollers provided so as to be able to roll between and a pocket for accommodating and holding the rollers at predetermined intervals in the circumferential direction. The inner protrusion and the outer protrusion are provided on the inner diameter side and the outer diameter side of the column portion of the pocket to prevent the rollers from falling off. In a roller bearing in which an oil passage extending radially inward and outward is provided in a portion excluding a portion where the protrusion and the outer protrusion are formed, and a relief groove recessed in the circumferential direction is provided on the wall surface of the pocket pillar. The depth of the relief groove is reduced from the outer diameter side to the inner diameter side. To.

即ち、前記逃がし溝を設けた部分の柱部の幅は、外径側の幅ｂと内径側の幅ａを比較すると、逃がし溝を設けた柱部の面が柱部の中心線に対して０°以上の角度で、ｂ≧ａの関係を保っている。   That is, the width of the column portion in which the escape groove is provided is compared with the width b on the outer diameter side and the width a on the inner diameter side. The relationship b ≧ a is maintained at an angle of 0 ° or more.

前記保持器の材料は、樹脂材料又は鉄製材料によって形成される。   The cage material is formed of a resin material or an iron material.

前記樹脂材料としては、ポリアミド６６、ポリアミド４６、ポリエーテルエーテルケトン、ポリフェニレンサルファイド等を使用することができ、グラスファイバーにより繊維強化してもよい。   As the resin material, polyamide 66, polyamide 46, polyetheretherketone, polyphenylene sulfide, or the like can be used, and the fiber may be reinforced with glass fiber.

この発明に係るころ軸受は、遊星歯車減速装置に使用することができ、その場合、外方部材を遊星歯車、内方部材を支持ピンとして使用される。   The roller bearing according to the present invention can be used in a planetary gear reduction device, in which case the outer member is used as a planetary gear and the inner member is used as a support pin.

この発明のころ軸受は、柱部の逃がし溝の深さを、外径側から内径側に向かって浅くしているので、内径側の柱部の幅が広く、それだけ強度が高い。
また、逃がし溝は、内径側から外径側に向かって広がる形状であるため、内径側から外径側へ潤滑油がスムーズに流れ、潤滑油中に混入した金属摩耗粉等の塵埃がポケット内に滞留し難く、金属摩耗粉が発生しやすい遊星歯車減速装置に使用しても、長寿命である。 In the roller bearing of the present invention, the depth of the escape groove of the column portion is made shallower from the outer diameter side toward the inner diameter side, so that the width of the column portion on the inner diameter side is wide and the strength is high accordingly.
In addition, since the relief groove has a shape that widens from the inner diameter side toward the outer diameter side, the lubricating oil smoothly flows from the inner diameter side to the outer diameter side, and dust such as metal wear powder mixed in the lubricating oil is contained in the pocket. Even if it is used in a planetary gear reduction device that is difficult to stay in the metal and easily generates metal wear powder, it has a long life.

この発明に係るころ軸受の一実施形態を部分的に示す平面図である。It is a top view which shows partially one Embodiment of the roller bearing which concerns on this invention. 図１のＩＩ−ＩＩ線の断面図である。It is sectional drawing of the II-II line of FIG. 図１のＩＩＩ−ＩＩＩ線の断面図である。It is sectional drawing of the III-III line of FIG. 従来のころ軸受を部分的に示す平面図である。It is a top view which shows the conventional roller bearing partially. 図４のＶ−Ｖ線の断面図である。It is sectional drawing of the VV line of FIG. 図５のＶＩ−ＶＩ線の断面図である。It is sectional drawing of the VI-VI line of FIG.

この発明の実施の形態について図１〜図３に基づいて説明する。
ころ軸受１は、内周面に円筒形の外輪軌道２を有する外方部材３と、外周面に円筒形の内輪軌道４を有する内方部材５と、これら外輪軌道２と内輪軌道４との間に転動自在に設けた複数のころ６とからなる。 An embodiment of the present invention will be described with reference to FIGS.
The roller bearing 1 includes an outer member 3 having a cylindrical outer ring raceway 2 on an inner peripheral surface, an inner member 5 having a cylindrical inner ring raceway 4 on an outer peripheral surface, and the outer ring raceway 2 and the inner ring raceway 4. It consists of a plurality of rollers 6 provided so as to be able to roll between them.

ころ６は、金属材料等から円筒状体として形成され、針状ころ、棒状ころ等として構成され、全体が円筒状に形成された保持器７に規則正しく配列して保持されている。   The roller 6 is formed as a cylindrical body from a metal material or the like, is configured as a needle roller, a rod roller, or the like, and is held in a regular array by a cage 7 formed entirely in a cylindrical shape.

ころ６は、外周面の中央がストレートで、その両側が両端に向かって径がなだらかに小さくなるようにクラウニング加工したクラウニング部からなるクラウニング付きのものを使用している。   As the roller 6, a roller with a crowning made of a crowning portion that is crowned so that the center of the outer peripheral surface is straight and the diameter of the both sides gradually decreases toward both ends is used.

保持器７は、周方向に所定間隔でころ６を規則正しく収容する矩形状のポケット８を有し、樹脂材料を射出成形等の手段を用いることにより形成される。保持器７は、ポケット８が内径側から外径側に貫通するように形成され、周方向に隣り合う各ポケット８間に柱部９と、柱部９の軸方向の両側に円環部１０を備える。   The cage 7 has a rectangular pocket 8 that regularly accommodates the rollers 6 at predetermined intervals in the circumferential direction, and is formed by using a resin material such as injection molding. The cage 7 is formed so that the pocket 8 penetrates from the inner diameter side to the outer diameter side. Between the pockets 8 adjacent to each other in the circumferential direction, the ring portion 10 and the annular portions 10 on both sides of the column portion 9 in the axial direction. Is provided.

ポケット８の柱部９の壁面には、周方向に凹む逃がし溝１６を内径側から外径側に貫通するように形成されている。   The wall surface of the column portion 9 of the pocket 8 is formed so as to penetrate the relief groove 16 recessed in the circumferential direction from the inner diameter side to the outer diameter side.

この柱部９の逃がし溝１６の深さＫは、図３に示すように、外径側から内径側に向かって浅くしている。   As shown in FIG. 3, the depth K of the relief groove 16 of the column portion 9 is made shallower from the outer diameter side toward the inner diameter side.

このため、前記逃がし溝１６を設けた部分の柱部９の幅は、外径側の幅ｂと内径側の幅ａを比較すると、逃がし溝を設けた柱部の面が柱部の中心線に対して０°以上の角度で、ｂ≧ａの関係を保っており、この発明の実施形態を示す図３と、従来例を示す図６の対比からも明らかなように、この発明の柱部９の内径側の幅ｂは、従来例の柱部２９の内径側の幅ｂよりも広くなっている。   For this reason, the width of the column portion 9 in the portion where the escape groove 16 is provided is such that the surface of the column portion provided with the escape groove is the center line of the column portion when the width b on the outer diameter side is compared with the width a on the inner diameter side. As shown in FIG. 3 showing the embodiment of the present invention and FIG. 6 showing the conventional example, the relationship of b ≧ a is maintained at an angle of 0 ° or more with respect to the pillar of the present invention. The width b on the inner diameter side of the portion 9 is wider than the width b on the inner diameter side of the column portion 29 of the conventional example.

保持器７を形成する樹脂材料としては、ポリアミド６６、ポリアミド４６、ポリエーテルエーテルケトン、ポリフェニレンサルファイド等を使用することができ、グラスファイバーにより繊維強化してもよい。   As the resin material for forming the cage 7, polyamide 66, polyamide 46, polyether ether ketone, polyphenylene sulfide, or the like can be used, and the fiber may be reinforced with glass fiber.

保持器７の柱部９には、軸方向両側の内径側と外径側とに、ころ６の抜け落ちを防止する内側突起部１１と外側突起部１２を設けている。   An inner protrusion 11 and an outer protrusion 12 that prevent the roller 6 from falling off are provided on the inner diameter side and the outer diameter side on both sides in the axial direction of the column portion 9 of the cage 7.

柱部９の軸方向中間部と軸方向両端の３か所には、径方向内外に延びる油道１３Ａ、１３Ｂが、内側突起部１１と外側突起部１２が形成された部分を除いて設けられる。そして、保持器７の径方向内側から外側に遠心力によって潤滑油を前記各油道１３Ａ、１３Ｂを介して流通させることにより、潤滑油の流れやころ軸受１内における潤滑油の油量を確保している。   Oil passages 13A and 13B extending inward and outward in the radial direction are provided at three locations in the axial intermediate portion and both axial ends of the column portion 9 except for the portion where the inner protrusion portion 11 and the outer protrusion portion 12 are formed. . Then, the flow of the lubricating oil and the amount of the lubricating oil in the roller bearing 1 are ensured by circulating the lubricating oil from the radially inner side to the outer side of the cage 7 by the centrifugal force through the oil passages 13A and 13B. doing.

この発明においては、柱部９に逃がし溝１６を形成しているので、逃がし溝１６によって潤滑油がスムーズに流通し、ころのストレート部の油膜切れが起こり難く、また、ポケット８内の潤滑油の流通が良好であるので、ポケット８内に金属摩耗粉等の塵埃が滞留しない。   In the present invention, since the relief groove 16 is formed in the column portion 9, the lubricating oil smoothly flows through the relief groove 16, and it is difficult for the oil film to break in the straight portion of the roller, and the lubricating oil in the pocket 8. Therefore, dust such as metal wear powder does not stay in the pocket 8.

図１〜図３に示す実施形態では、前記外輪軌道２と保持器７の外径との間に形成される外側油路１４の隙間間隔よりも、内輪軌道４と保持器７の内径との間に形成される内側油路１５の隙間間隔を大きく設定している。   In the embodiment shown in FIG. 1 to FIG. 3, the inner ring raceway 4 and the inner diameter of the cage 7 are larger than the gap interval of the outer oil passage 14 formed between the outer ring raceway 2 and the outer diameter of the cage 7. A gap interval between the inner oil passages 15 formed therebetween is set large.

これにより、内側油路１５から外側油路１４への潤滑油の流通が多くなり、潤滑油による冷却効果も向上する。   Thereby, the circulation of the lubricating oil from the inner oil passage 15 to the outer oil passage 14 increases, and the cooling effect by the lubricating oil is also improved.

この発明のころ軸受１は、例えば、遊星歯車減速装置の各減速歯車機構における遊星歯車（外方部材３）を支持ピン（内方部材５）によって軸支する場合に使用される。   The roller bearing 1 of the present invention is used, for example, when a planetary gear (outer member 3) in each reduction gear mechanism of a planetary gear reduction device is supported by a support pin (inner member 5).

このような場合、外方部材３と保持器７との間に形成される隙間が外側油路１４を形成し、内方部材５と保持器７との間に形成される隙間が内側油路１５を形成し、遊星歯車減速装置の外形を構成するハウジング内の潤滑油が、外側油路１４と内側油路１５を通ってころ軸受１内に流入する。そして、流入した潤滑油は、遊星歯車が回転するときに生じる遠心力によって、各油道１３Ａ、１３Ｂを介して保持器７の径方向内側から外側に向けて流れてハウジング内に放出される。これにより、ころ軸受１の潤滑性が高められている。   In such a case, the gap formed between the outer member 3 and the cage 7 forms the outer oil passage 14, and the gap formed between the inner member 5 and the cage 7 is the inner oil passage. The lubricating oil in the housing that forms the outer shape of the planetary gear speed reducer flows into the roller bearing 1 through the outer oil passage 14 and the inner oil passage 15. The inflowing lubricating oil flows from the radially inner side to the outer side of the cage 7 through the oil passages 13A and 13B and is discharged into the housing by the centrifugal force generated when the planetary gear rotates. Thereby, the lubricity of the roller bearing 1 is improved.

１ ころ軸受
２ 外輪軌道
３ 外方部材
４ 内輪軌道
５ 内方部材
６ ころ
６ａ ストレート部
６ｂ クラウニング部
７ 保持器
８ ポケット
９ 柱部
１０ 円環部
１１ 内側突起部
１２ 外側突起部
１３Ａ 油道
１３Ｂ 油道
１４ 外側油路
１５ 内側油路
１６ 逃がし溝 DESCRIPTION OF SYMBOLS 1 Roller bearing 2 Outer ring raceway 3 Outer member 4 Inner ring raceway 5 Inner member 6 Roller 6a Straight part 6b Crowning part 7 Cage 8 Pocket 9 Column part 10 Ring part 11 Inner protrusion part 12 Outer protrusion part 13A Oil path 13B Oil Road 14 Outer oil passage 15 Inner oil passage 16 Relief groove

Claims (10)

内周面に円筒形の外輪軌道を有する外方部材と、外周面に円筒形の内輪軌道を有する内方部材と、これら外輪軌道と内輪軌道との間に転動自在に設けた複数のころと、ころを周方向に所定間隔で収容保持するポケットを有する全体が円筒状で、周方向に隣り合う各ポケット間に柱部と、この柱部の軸方向の両側に円環部を備える保持器とからなり、ポケットの柱部の内径側と外径側とに、ころの抜け落ちを防止する内側突起部と外側突起部を設け、この内側突起部と外側突起部が形成された部分を除いた部分に径方向内外に延びる油道を設け、ポケットの柱部の壁面に、周方向に凹む逃がし溝を設け、この柱部の逃がし溝の深さを、外径側から内径側に向かって浅くしたことを特徴とするころ軸受。 An outer member having a cylindrical outer ring raceway on the inner peripheral surface, an inner member having a cylindrical inner ring raceway on the outer peripheral surface, and a plurality of rollers provided in a freely rollable manner between the outer ring raceway and the inner ring raceway And the whole having the pocket which accommodates and holds the roller at a predetermined interval in the circumferential direction is cylindrical, and is provided with a column part between each pocket adjacent in the circumferential direction, and an annular part on both sides in the axial direction of the column part. An inner projection and an outer projection are provided on the inner diameter side and outer diameter side of the pocket pillar portion to prevent the rollers from falling off, except for the portion where the inner projection portion and the outer projection portion are formed. An oil passage that extends inward and outward in the radial direction is provided in the part, and a relief groove that is recessed in the circumferential direction is provided in the wall surface of the pocket pillar part. The depth of the relief groove of the pillar part is increased from the outer diameter side toward the inner diameter side Roller bearings characterized by being shallow. 前記逃がし溝を設けた部分の柱部の外径側の幅ｂと内径側の幅ａを比較した場合に、逃がし溝を設けた柱部の面が柱部の中心線に対して０°以上の角度で、ｂ≧ａの関係を保っていることを特徴とする請求項１記載のころ軸受。   When comparing the width b on the outer diameter side and the width a on the inner diameter side of the column portion of the portion provided with the relief groove, the surface of the column portion provided with the relief groove is 0 ° or more with respect to the center line of the column portion The roller bearing according to claim 1, wherein a relationship of b ≧ a is maintained at an angle of 前記外輪軌道と保持器の外径との間に形成される外側油路の隙間間隔よりも、内輪軌道と保持器の内径との間に形成される内側油路の隙間間隔を大きく設定している請求項１又は２記載のころ軸受。   The gap interval of the inner oil passage formed between the inner ring raceway and the inner diameter of the cage is set larger than the gap interval of the outer oil passage formed between the outer ring raceway and the outer diameter of the cage. The roller bearing according to claim 1 or 2. 前記保持器の材料が樹脂材料である請求項１〜３のいずれかに記載のころ軸受。   The roller bearing according to any one of claims 1 to 3, wherein a material of the cage is a resin material. 前記保持器の材料が鉄製材料である請求項１〜３のいずれかに記載のころ軸受。   The roller bearing according to any one of claims 1 to 3, wherein a material of the cage is an iron material. 前記樹脂材料がポリアミド６６又はポリアミド４６である請求項４に記載のころ軸受。   The roller bearing according to claim 4, wherein the resin material is polyamide 66 or polyamide 46. 前記樹脂材料がポリエーテルエーテルケトン又はポリフェニレンサルファイドである請求項４に記載のころ軸受。   The roller bearing according to claim 4, wherein the resin material is polyetheretherketone or polyphenylene sulfide. 前記樹脂材料を、グラスファイバーにより繊維強化している請求項６又は７に記載のころ軸受。   The roller bearing according to claim 6 or 7, wherein the resin material is fiber reinforced with glass fiber. 前記請求項１〜８のいずれかに記載のころ軸受を使用した遊星歯車減速装置。   A planetary gear reduction device using the roller bearing according to any one of claims 1 to 8. 前記外方部材を遊星歯車、内方部材を支持ピンとした請求項８記載の遊星歯車減速装置。   The planetary gear reduction device according to claim 8, wherein the outer member is a planetary gear and the inner member is a support pin.
JP2011207740A 2011-09-22 2011-09-22 Roller bearing Expired - Fee Related JP5735387B2 (en)

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