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JP6515447B2 - Idler pulley bearings - Google Patents

Idler pulley bearings Download PDF

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JP6515447B2
JP6515447B2 JP2014106214A JP2014106214A JP6515447B2 JP 6515447 B2 JP6515447 B2 JP 6515447B2 JP 2014106214 A JP2014106214 A JP 2014106214A JP 2014106214 A JP2014106214 A JP 2014106214A JP 6515447 B2 JP6515447 B2 JP 6515447B2
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inner ring
peripheral surface
outer peripheral
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annular
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JP2015222096A (en
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佐藤　大樹
大樹 佐藤
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NSK Ltd
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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
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • 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
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • F16C13/006—Guiding rollers, wheels or the like, formed by or on the outer element of a single bearing or bearing unit, e.g. two adjacent bearings, whose ratio of length to diameter is generally less than one
    • 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
    • F16C33/7859—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 further sealing element
    • F16C33/7863—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 further sealing element mounted to the inner race, e.g. a flinger to use centrifugal effect
    • 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
    • F16C19/08—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 two or more rows of balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/63—Gears with belts and pulleys

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pulleys (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Description

本発明はアイドラプーリ用軸受に関する。   The present invention relates to bearings for idler pulleys.

例えば、オルタネータ等の自動車用補機は、エンジンを駆動源とし、エンジンのクランク軸に固定された駆動プーリ、自動車用補機の回転軸に固定された従動プーリ、及びアイドラプーリにベルトが巻き掛けられて駆動される。アイドラプーリは、支持軸に転がり軸受を介して支持されており、ベルトに所望の張力を付与しながらベルトと共に回転する。   For example, an automotive accessory such as an alternator has an engine as a drive source, and a drive pulley fixed to a crankshaft of the engine, a driven pulley fixed to a rotation shaft of the automotive accessory, and an idler pulley Driven and driven. The idler pulley is supported on the support shaft via a rolling bearing and rotates with the belt while applying a desired tension to the belt.

ここで、アイドラプーリ用軸受は、内輪及び外輪に形成された軌道面間に、転動体が転動可能に配置される。そして軸受内部空間に存在する潤滑油の外部への漏出を防止するため、外輪の内周面には軸受内部空間を密封するシールが配置されることが多い。さらに、シールを含めた軸受装置内への外部からの異物の混入を防止することを目的として、シールよりも軸方向外側において、内輪の外周面にスリンガを配置する場合がある。   Here, in the idler pulley bearing, rolling elements are disposed rollably between the raceway surfaces formed on the inner ring and the outer ring. In order to prevent the lubricating oil present in the bearing internal space from leaking out, a seal that seals the bearing internal space is often arranged on the inner peripheral surface of the outer ring. Furthermore, for the purpose of preventing the entry of foreign matter from the outside into the bearing device including the seal, a slinger may be disposed on the outer peripheral surface of the inner ring axially outside the seal.

例えば、特許文献１には、内輪と外輪の間の軸受空間を内側と外側の２つの接触シールで密封した密封型転がり軸受が開示されている。ここで、軸方向外側の接触シールは、内輪の外周面に嵌合固定される芯金と、芯金に固着された弾性部材と、を有している。   For example, Patent Document 1 discloses a sealed rolling bearing in which a bearing space between an inner ring and an outer ring is sealed by two contact seals on the inside and the outside. Here, the contact seal on the axially outer side has a core metal fitted and fixed to the outer peripheral surface of the inner ring, and an elastic member fixed to the core metal.

また、特許文献２には、シールド板の外周縁部に断面形状がコ字形の折り返し部を形成し、この折り返し部を外輪の端部内周面に設けられた係止凹溝に係止した転がり軸受用密封装置が記載されている。   Further, in Patent Document 2, rolling is performed by forming a U-shaped folded portion in the outer peripheral edge portion of the shield plate, and locking the folded portion in a locking groove provided on the inner peripheral surface of the end portion of the outer ring. A bearing seal is described.

特開２００６−３１２９７０号公報Unexamined-Japanese-Patent No. 2006-312970 特開平８−２４０２２８号公報JP-A-8-240228

このように、スリンガや芯金、シールド板等を内輪の外周面又は外輪の内周面に固定した場合、圧入時に内輪又は外輪嵌め合い分との干渉面（面積大）が原因で、スリンガ等が変形して軸方向外側に倒れてしまうことがある。この場合、スリンガ等が、本来の設置目的である防水、防泥水の役目を果たさなくなる虞がある。   Thus, when the slinger, core metal, shield plate or the like is fixed to the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring, due to the interference surface (large area) with the inner ring or outer ring fitting at the time of press-fitting May be deformed and fall outside in the axial direction. In this case, there is a risk that the slinger and the like will not play the role of waterproofing and mudproofing which is the original purpose of installation.

本発明は上記事情に鑑みてなされたものであり、スリンガの変形を抑制することが可能なアイドラプーリ用軸受を提供することを目的とする。   This invention is made in view of the said situation, and it aims at providing the bearing for idler pulleys which can suppress a deformation | transformation of a slinger.

本発明の上記目的は、下記の構成により達成される。
（１） 内周面に外輪軌道面を有する外輪と、
外周面に内輪軌道面を有する内輪と、
前記外輪軌道面及び前記内輪軌道面の間に、転動自在に配置される複数の転動体と、
前記内輪の外周面の軸方向両端部に圧入固定される一対のスリンガと、
を備え、外周面に巻き掛けられるベルトに所望の張力を付与するプーリ部材に取り付け可能なアイドラプーリ用軸受であって、
前記スリンガは、前記内輪の外周面に嵌合するスリーブ部と、前記スリーブ部の軸方向端部から径方向外側に向かって延びるフランジ部と、を有し、
前記スリーブ部には、径方向内側に突出する円環状凸部が全周に亘って形成され、
前記内輪の外周面の軸方向両端部には、前記スリーブ部の円環状凸部が嵌合する円環状凹部と、軸方向両端部に向かうにしたがって径方向内側に傾斜し、前記内輪の軸方向両端面まで延在する円環状テーパ部と、が全周に亘って形成されると共に、
前記内輪の外周面には、前記円環状凹部を挟んだ軸方向両側に平坦部が設けられ、かつ、前記軸方向外側寄りの前記平坦部の軸方向厚みは、前記フランジ部の軸方向厚みの範囲内であり、
前記円環状テーパ部の軸方向内側の終端部と前記スリーブ部の軸方向外側の終端部の位置が軸方向で揃っていることを特徴とするアイドラプーリ用軸受。
（２） 内周面に外輪軌道面を有する外輪と、
外周面に内輪軌道面を有する内輪と、
前記外輪軌道面及び前記内輪軌道面の間に、転動自在に配置される複数の転動体と、
前記外輪に固定されるシール部材と、
前記内輪の外周面の軸方向両端部に圧入固定される一対のスリンガと、
を備え、外周面に巻き掛けられるベルトに所望の張力を付与するプーリ部材に取り付け可能なアイドラプーリ用軸受であって、
前記スリンガは、前記内輪の外周面に嵌合するスリーブ部と、前記スリーブ部の軸方向端部から径方向外側に向かって延びるフランジ部と、を有し、
前記スリーブ部には、径方向内側に突出する円環状凸部と、当該円環状凸部と対応する形状の円環状凹部が全周に亘って形成され、
前記内輪の外周面の軸方向両端部には、前記スリーブ部の円環状凸部が嵌合する円環状凹部と、軸方向両端部に向かうにしたがって径方向内側に傾斜し、前記内輪の軸方向両端面まで延在する円環状テーパ部と、が全周に亘って形成されると共に、
前記内輪の外周面には、前記円環状凹部を挟んだ軸方向両側に平坦部が設けられ、かつ、前記軸方向外側寄りの前記平坦部の軸方向厚みは、前記フランジ部の軸方向厚みの範囲内であり、
前記円環状テーパ部の軸方向内側の終端部と前記スリーブ部の軸方向外側の終端部の位置が軸方向で揃っており、
前記シール部材は、径方向に延びる芯金と当該芯金を覆う弾性部材とからなり、
前記弾性部材の径方向内側端部に形成された第１リップが前記内輪に当接するとともに、前記弾性部材の軸方向側面に形成された第２リップが前記フランジ部に当接することを特徴とするアイドラプーリ用軸受。 The above object of the present invention is achieved by the following constitution.
(1) An outer ring having an outer ring raceway surface on the inner circumferential surface,
An inner ring having an inner ring raceway surface on an outer peripheral surface,
A plurality of rolling elements disposed rollably between the outer ring raceway surface and the inner ring raceway surface;
A pair of slinger fixedly press-fitted to both axial end portions of the outer peripheral surface of the inner ring,
An idler pulley bearing attachable to a pulley member for applying a desired tension to a belt wound around an outer peripheral surface, comprising:
The slinger has a sleeve portion fitted to the outer peripheral surface of the inner ring, and a flange portion extending radially outward from an axial end of the sleeve portion,
An annular convex portion protruding radially inward is formed on the entire circumference of the sleeve portion,
An annular recess in which the annular convex portion of the sleeve portion is fitted at both axial end portions of the outer peripheral surface of the inner ring, and a radially inward inclination toward the axial end portions, the axial direction of the inner ring An annular tapered portion extending to both end surfaces is formed over the entire circumference, and
On the outer peripheral surface of the inner ring, flat portions are provided on both sides in the axial direction sandwiching the annular recess, and the axial thickness of the flat portion closer to the axial outer side is the axial thickness of the flange portion Within the range,
A bearing for an idler pulley , wherein positions of an axially inner end portion of the annular tapered portion and an axially outer end portion of the sleeve portion are axially aligned .
(2) An outer ring having an outer ring raceway surface on the inner circumferential surface,
An inner ring having an inner ring raceway surface on an outer peripheral surface,
A plurality of rolling elements disposed rollably between the outer ring raceway surface and the inner ring raceway surface;
A seal member fixed to the outer ring;
A pair of slinger fixedly press-fitted to both axial end portions of the outer peripheral surface of the inner ring,
An idler pulley bearing attachable to a pulley member for applying a desired tension to a belt wound around an outer peripheral surface, comprising:
The slinger has a sleeve portion fitted to the outer peripheral surface of the inner ring, and a flange portion extending radially outward from an axial end of the sleeve portion,
In the sleeve portion, an annular convex portion protruding radially inward and an annular concave portion having a shape corresponding to the annular convex portion are formed over the entire circumference.
An annular recess in which the annular convex portion of the sleeve portion is fitted at both axial end portions of the outer peripheral surface of the inner ring, and a radially inward inclination toward the axial end portions, the axial direction of the inner ring An annular tapered portion extending to both end surfaces is formed over the entire circumference, and
On the outer peripheral surface of the inner ring, flat portions are provided on both sides in the axial direction sandwiching the annular recess, and the axial thickness of the flat portion closer to the axial outer side is the axial thickness of the flange portion Within the range ,
The positions of the axially inner end portion of the annular tapered portion and the axially outer end portion of the sleeve portion are axially aligned.
The seal member comprises a radially extending core metal and an elastic member covering the core metal.
The first lip formed on the radially inner end of the elastic member abuts on the inner ring, and the second lip formed on the axial side surface of the elastic member abuts on the flange portion. Bearings for idler pulleys.

本発明のアイドラプーリ用軸受によれば、スリンガのスリーブ部に円環状凸部を設けると共に、内輪に円環状凹部及び円環状テーパ部を設けることにより、スリンガと内輪の接触部の面積が減少するので、圧入代が減少し、圧入によるスリンガの変形を抑制することができる。   According to the idler pulley bearing of the present invention, the area of the contact portion between the slinger and the inner ring is reduced by providing the annular convex portion on the sleeve portion of the slinger and providing the annular recess and the annular tapered portion on the inner ring. Therefore, the press-in allowance can be reduced, and the deformation of the slinger due to the press-in can be suppressed.

アイドラプーリの要部断面図である。It is principal part sectional drawing of an idler pulley. 玉軸受の要部断面図である。It is principal part sectional drawing of a ball bearing. スリンガと内輪の相対回転を防止する形状を示す断面図である。It is sectional drawing which shows the shape which prevents relative rotation of a slinger and an inner ring. スリンガと内輪の相対回転を防止する形状を示す断面図である。It is sectional drawing which shows the shape which prevents relative rotation of a slinger and an inner ring. スリンガと内輪の相対回転を防止する形状を示す断面図である。It is sectional drawing which shows the shape which prevents relative rotation of a slinger and an inner ring.

以下、本発明に係るアイドラプーリ用軸受の一実施形態について、図面に基づいて詳細に説明する。   Hereinafter, an embodiment of an idler pulley bearing according to the present invention will be described in detail based on the drawings.

図１は本発明のアイドラプーリ用軸受が組み込まれたアイドラプーリの要部縦断面図である。アイドラプーリ１は、図示しない支持軸に外嵌される玉軸受１０（アイドラプーリ用軸受）と、内周面に玉軸受１０が取り付けられるプーリ部材２とを備える。プーリ部材２には、外周面に不図示のベルト溝が形成され、図示しないベルトが巻き掛けられており、アイドラプーリ１は、自動車の補機等を駆動するベルトに所望の張力を付与している。   FIG. 1 is a longitudinal sectional view of an essential part of an idler pulley in which a bearing for an idler pulley according to the present invention is incorporated. The idler pulley 1 includes a ball bearing 10 (bearing for idler pulley) externally fitted to a support shaft (not shown), and a pulley member 2 to which the ball bearing 10 is attached on the inner peripheral surface. A belt groove (not shown) is formed on the outer peripheral surface of the pulley member 2 and a belt (not shown) is wound around. The idler pulley 1 applies a desired tension to a belt for driving a car accessory or the like. There is.

図２も参照し、玉軸受１０は、内周面に二列の外輪軌道面１１ａを有する外輪１１と、外周面に二列の内輪軌道面１２ａを有する内輪１２と、二列の外輪軌道面１１ａ及び内輪軌道面１２ａの間に転動自在に配置される転動体である複数の玉１３と、複列配置された複数の玉１３をそれぞれ保持する一対の保持器１４と、を備える。そして、プーリ部材２は、玉軸受１０を介して不図示の支持軸に回転可能に支持される。   Referring also to FIG. 2, the ball bearing 10 includes an outer ring 11 having two rows of outer ring raceway surfaces 11a on its inner circumferential surface, an inner ring 12 having two rows of inner ring raceway surfaces 12a on its outer circumferential surface, and two rows of outer ring raceway surfaces. A plurality of balls 13 which are rolling elements disposed rotatably between the inner ring raceway surface 12a and a pair of cages 14 which respectively hold the plurality of balls 13 arranged in double rows are provided. The pulley member 2 is rotatably supported by a support shaft (not shown) via the ball bearing 10.

外輪１１の内周面及び内輪１２の外周面には、外輪軌道面１１ａ及び内輪軌道面１２ａよりも軸方向外側に、それぞれ外輪凹段差部１１ｂ及び内輪凹段差部１２ｂが形成される。   An outer ring recessed step portion 11 b and an inner ring recessed step portion 12 b are formed on the inner peripheral surface of the outer ring 11 and the outer peripheral surface of the inner ring 12 axially outside the outer ring raceway surface 11 a and the inner ring raceway surface 12 a.

外輪凹段差部１１ｂの軸方向内側端部には、円環状のシール部材３が係止される係止溝１１ｃが全周に亘って形成される。シール部材３は、径方向に延びる芯金４と当該芯金４を覆う弾性部材５とからなる。そして、弾性部材５が係止溝１１ｃに嵌め込まれることにより、シール部材３全体が外輪１１に固定される。弾性部材５の径方向内側端部に形成された第１リップ５ａは、内輪凹段差部１２ｂを構成する内輪１２の側面１２ｃと当接する。したがって、外輪１１の内周面と内輪１２の外周面とで囲まれる軸受内部空間が、一対のシール部材３によって密封され、軸受内部空間に存在する潤滑油の外部への漏出が防止される。また、弾性部材５の軸方向側面に形成された第２リップ５ｂが、後述するスリンガ６のフランジ部８に当接するので、軸受外部からの異物の侵入を防止することが可能である。   A locking groove 11c in which the annular sealing member 3 is locked is formed over the entire circumference at the axially inner end portion of the outer ring recessed step portion 11b. The seal member 3 includes a core 4 extending in the radial direction and an elastic member 5 covering the core 4. Then, the entire seal member 3 is fixed to the outer ring 11 by fitting the elastic member 5 into the locking groove 11 c. The first lip 5a formed at the radially inner end of the elastic member 5 abuts on the side surface 12c of the inner ring 12 which constitutes the inner ring concave step portion 12b. Therefore, the bearing internal space surrounded by the inner peripheral surface of the outer ring 11 and the outer peripheral surface of the inner ring 12 is sealed by the pair of seal members 3 and the leakage of the lubricating oil present in the bearing internal space is prevented. Further, since the second lip 5b formed on the side surface in the axial direction of the elastic member 5 abuts on the flange portion 8 of the slinger 6 described later, it is possible to prevent the entry of foreign matter from the outside of the bearing.

内輪凹段差部１２ｂの軸方向外側端部には、円環状のスリンガ６が圧入固定されている。スリンガ６は、内輪凹段差部１２ｂに嵌合するスリーブ部７と、スリーブ部７の軸方向外側端部から径方向外側に向かって延びるフランジ部８と、を有する。スリーブ部７の軸方向外側部には、内周面から径方向内側に突出する円環状凸部７ａが全周に亘って形成される。この円環状凸部７ａは、スリーブ部７の一部を外周側から押圧して変形させることにより形成されるので、スリーブ部７の外周面には円環状凸部７ａと対応する形状の円環状凹部７ｂが形成される。なお、円環状凸部７ａを設ければ、円環状凹部７ｂを必ずしも設ける必要はない。   An annular slinger 6 is press-fitted and fixed to the axially outer end portion of the inner ring recessed step portion 12 b. The slinger 6 has a sleeve portion 7 fitted to the inner ring recessed step portion 12 b, and a flange portion 8 extending radially outward from the axially outer end portion of the sleeve portion 7. An annular convex portion 7 a that protrudes radially inward from the inner circumferential surface is formed on the entire outside in the axial direction outer portion of the sleeve portion 7. The annular convex portion 7a is formed by pressing and deforming a part of the sleeve portion 7 from the outer peripheral side, and therefore, the outer peripheral surface of the sleeve portion 7 has an annular shape corresponding to the annular convex portion 7a. The recess 7 b is formed. In addition, if the annular convex part 7a is provided, it is not necessary to necessarily provide the annular concave part 7b.

そして、内輪凹段差部１２ｂの軸方向外側端部には、スリーブ部７の円環状凸部７ａが嵌合する円環状凹部１２ｄと、軸方向外側に向かうにしたがって径方向内側に傾斜し、内輪１２の軸方向端面１２ｆまで延在する円環状テーパ部１２ｅと、が全周に亘って形成される。   Then, an annular concave portion 12d in which the annular convex portion 7a of the sleeve portion 7 is fitted to the axially outer end portion of the inner ring concave step portion 12b, and the inner ring is inclined radially inward toward the axially outer side An annular tapered portion 12 e extending to the axial end face 12 f is formed over the entire circumference.

このように、スリンガ６のスリーブ部７に円環状凸部７ａを全周に亘って設けると共に、内輪１２に円環状凹部１２ｄ及び円環状テーパ部１２ｅを全周に亘って設けることにより、スリンガ６と内輪１２の接触部の面積が減少するので、圧入代が減少し、圧入によるスリンガ６の変形を抑制することができる。なお、仮に、これら円環状凸部７ａ、円環状凹部１２ｄ、及び円環状テーパ部１２ｅを設けなかった場合には、圧入時に内輪１２とスリンガ６の圧入面の面積が大きくなるため、図２に破線で示すように、スリンガ６のフランジ部８が変形して軸方向外側に倒れてしまう虞がある。 Thus, the slinger 6 is provided by providing the annular convex portion 7 a on the entire circumference of the sleeve portion 7 of the slinger 6 and providing the annular recess 12 d and the annular tapered portion 12 e on the entire circumference of the inner ring 12. Since the area of the contact portion of the inner ring 12 is reduced, the press-in allowance can be reduced, and the deformation of the slinger 6 due to the press-in can be suppressed. Incidentally, if, these annular protrusions 7a, if no annular recess 12d, and an annular tapered portion 12e provided, since the surface product of the press-fitting surface of the inner ring 12 and the slinger 6 is increased at the time of press-fitting, FIG. 2 As shown by the broken line, the flange portion 8 of the slinger 6 may be deformed and fall outward in the axial direction.

また、上述した円環状凸部７ａや円環状凹部１２ｄに加えて、図３〜５に示すように、スリーブ部７に径方向内側に突出する凸部７ｃを少なくとも一つ形成し、内輪凹段差部１２ｂに凸部７ｃと同数の凹部１２ｇを形成し、凸部７ｃが凹部１２ｇに嵌合する構成とすることが更に好ましい。凸部７ｃ及び凹部１２ｇの形状は、図３では断面半円形状であり、図４では軸方向外側に向かうにしたがって径方向内側に傾斜する折り曲げ形状であり、図５では断面台形形状とされているが、特に限定されるものではない。これら凸部７ｃ及び凹部１２ｇは、円環状凸部７ａや円環状凹部１２ｄと異なり、全周に亘って形成されるものではなく、円周方向における一部に形成されるものであり、スリンガ６と内輪１２との相対回転を規制する。これにより、スリンガ６の内輪１２に対する連れ回りが防止されるので、スリンガ６の公転を防ぐことができる。   Further, in addition to the annular convex portion 7a and the annular concave portion 12d described above, as shown in FIGS. 3 to 5, at least one convex portion 7c that protrudes radially inward is formed in the sleeve portion 7, It is more preferable to form the recessed part 12g of the same number as the convex part 7c in the part 12b, and to set it as the structure which the convex part 7c fits with the concave part 12g. The shape of the convex portion 7c and the concave portion 12g is a semicircular shape in cross section in FIG. 3, a bent shape which inclines inward in the radial direction toward the axial direction outer side in FIG. However, it is not particularly limited. Unlike the annular convex portion 7 a and the annular concave portion 12 d, the convex portion 7 c and the concave portion 12 g are not formed over the entire circumference, but are formed in a part in the circumferential direction. And restrict relative rotation between the inner ring 12 and the inner ring 12. Thus, the rotation of the slinger 6 to the inner ring 12 is prevented, so that the revolution of the slinger 6 can be prevented.

尚、本発明は、前述した実施形態に限定されるものではなく、適宜変更、改良等が可能である。   The present invention is not limited to the above-described embodiment, and appropriate modifications, improvements, and the like can be made.

１ アイドラプーリ
２ プーリ部材
３ シール部材
４ 芯金
５ 弾性部材
５ａ 第１リップ
５ｂ 第２リップ
６ スリンガ
７ スリーブ部
７ａ 円環状凸部
７ｂ 円環状凹部
７ｃ 凸部
８ フランジ部
１０ 玉軸受（アイドラプーリ用軸受）
１１ 外輪
１１ａ 外輪軌道面
１１ｂ 外輪凹段差部
１２ 内輪
１２ａ 内輪軌道面
１２ｂ 内輪凹段差部
１２ｃ 側面
１２ｄ 円環状凹部
１２ｅ 円環状テーパ部
１２ｆ 軸方向端面
１２ｇ 凹部
１３ 玉（転動体）
１４ 保持器 DESCRIPTION OF SYMBOLS 1 idler pulley 2 pulley member 3 seal member 4 core metal 5 elastic member 5 a first lip 5 b second lip 6 slinger 7 sleeve portion 7 a annular convex portion 7 b annular concave portion 7 c convex portion 8 flange portion 10 ball bearing (for idler pulley bearing)
11 outer ring 11a outer ring raceway surface 11b outer ring concave step 12 inner ring 12a inner ring raceway surface 12b inner ring concave step 12c side 12d annular recess 12e annular taper 12f axial end face 12g recess 13 ball (rolling element)
14 Retainer

Claims (2)

内周面に外輪軌道面を有する外輪と、
外周面に内輪軌道面を有する内輪と、
前記外輪軌道面及び前記内輪軌道面の間に、転動自在に配置される複数の転動体と、
前記内輪の外周面の軸方向両端部に圧入固定される一対のスリンガと、
を備え、外周面に巻き掛けられるベルトに所望の張力を付与するプーリ部材に取り付け可能なアイドラプーリ用軸受であって、
前記スリンガは、前記内輪の外周面に嵌合するスリーブ部と、前記スリーブ部の軸方向端部から径方向外側に向かって延びるフランジ部と、を有し、
前記スリーブ部には、径方向内側に突出する円環状凸部が全周に亘って形成され、
前記内輪の外周面の軸方向両端部には、前記スリーブ部の円環状凸部が嵌合する円環状凹部と、軸方向両端部に向かうにしたがって径方向内側に傾斜し、前記内輪の軸方向両端面まで延在する円環状テーパ部と、が全周に亘って形成されると共に、
前記内輪の外周面には、前記円環状凹部を挟んだ軸方向両側に平坦部が設けられ、かつ、前記軸方向外側寄りの前記平坦部の軸方向厚みは、前記フランジ部の軸方向厚みの範囲内であり、
前記円環状テーパ部の軸方向内側の終端部と前記スリーブ部の軸方向外側の終端部の位置が軸方向で揃っていることを特徴とするアイドラプーリ用軸受。 An outer ring having an outer ring raceway surface on an inner circumferential surface;
An inner ring having an inner ring raceway surface on an outer peripheral surface,
A plurality of rolling elements disposed rollably between the outer ring raceway surface and the inner ring raceway surface;
A pair of slinger fixedly press-fitted to both axial end portions of the outer peripheral surface of the inner ring,
An idler pulley bearing attachable to a pulley member for applying a desired tension to a belt wound around an outer peripheral surface, comprising:
The slinger has a sleeve portion fitted to the outer peripheral surface of the inner ring, and a flange portion extending radially outward from an axial end of the sleeve portion,
An annular convex portion protruding radially inward is formed on the entire circumference of the sleeve portion,
An annular recess in which the annular convex portion of the sleeve portion is fitted at both axial end portions of the outer peripheral surface of the inner ring, and a radially inward inclination toward the axial end portions, the axial direction of the inner ring An annular tapered portion extending to both end surfaces is formed over the entire circumference, and
On the outer peripheral surface of the inner ring, flat portions are provided on both sides in the axial direction sandwiching the annular recess, and the axial thickness of the flat portion closer to the axial outer side is the axial thickness of the flange portion Within the range,
A bearing for an idler pulley , wherein positions of an axially inner end portion of the annular tapered portion and an axially outer end portion of the sleeve portion are axially aligned . 内周面に外輪軌道面を有する外輪と、
外周面に内輪軌道面を有する内輪と、
前記外輪軌道面及び前記内輪軌道面の間に、転動自在に配置される複数の転動体と、
前記外輪に固定されるシール部材と、
前記内輪の外周面の軸方向両端部に圧入固定される一対のスリンガと、
を備え、外周面に巻き掛けられるベルトに所望の張力を付与するプーリ部材に取り付け可能なアイドラプーリ用軸受であって、
前記スリンガは、前記内輪の外周面に嵌合するスリーブ部と、前記スリーブ部の軸方向端部から径方向外側に向かって延びるフランジ部と、を有し、
前記スリーブ部には、径方向内側に突出する円環状凸部と、当該円環状凸部と対応する形状の円環状凹部が全周に亘って形成され、
前記内輪の外周面の軸方向両端部には、前記スリーブ部の円環状凸部が嵌合する円環状凹部と、軸方向両端部に向かうにしたがって径方向内側に傾斜し、前記内輪の軸方向両端面まで延在する円環状テーパ部と、が全周に亘って形成されると共に、
前記内輪の外周面には、前記円環状凹部を挟んだ軸方向両側に平坦部が設けられ、かつ、前記軸方向外側寄りの前記平坦部の軸方向厚みは、前記フランジ部の軸方向厚みの範囲内であり、
前記円環状テーパ部の軸方向内側の終端部と前記スリーブ部の軸方向外側の終端部の位置が軸方向で揃っており、
前記シール部材は、径方向に延びる芯金と当該芯金を覆う弾性部材とからなり、
前記弾性部材の径方向内側端部に形成された第１リップが前記内輪に当接するとともに、前記弾性部材の軸方向側面に形成された第２リップが前記フランジ部に当接することを特徴とするアイドラプーリ用軸受。 An outer ring having an outer ring raceway surface on an inner circumferential surface;
An inner ring having an inner ring raceway surface on an outer peripheral surface,
A plurality of rolling elements disposed rollably between the outer ring raceway surface and the inner ring raceway surface;
A seal member fixed to the outer ring;
A pair of slinger fixedly press-fitted to both axial end portions of the outer peripheral surface of the inner ring,
An idler pulley bearing attachable to a pulley member for applying a desired tension to a belt wound around an outer peripheral surface, comprising:
The slinger has a sleeve portion fitted to the outer peripheral surface of the inner ring, and a flange portion extending radially outward from an axial end of the sleeve portion,
In the sleeve portion, an annular convex portion protruding radially inward and an annular concave portion having a shape corresponding to the annular convex portion are formed over the entire circumference.
An annular recess in which the annular convex portion of the sleeve portion is fitted at both axial end portions of the outer peripheral surface of the inner ring, and a radially inward inclination toward the axial end portions, the axial direction of the inner ring An annular tapered portion extending to both end surfaces is formed over the entire circumference, and
On the outer peripheral surface of the inner ring, flat portions are provided on both sides in the axial direction sandwiching the annular recess, and the axial thickness of the flat portion closer to the axial outer side is the axial thickness of the flange portion Within the range ,
The positions of the axially inner end portion of the annular tapered portion and the axially outer end portion of the sleeve portion are axially aligned.
The seal member comprises a radially extending core metal and an elastic member covering the core metal.
The first lip formed on the radially inner end of the elastic member abuts on the inner ring, and the second lip formed on the axial side surface of the elastic member abuts on the flange portion. Bearings for idler pulleys.
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