JP5586347B2 - Pulley - Google Patents

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JP5586347B2
JP5586347B2 JP2010151847A JP2010151847A JP5586347B2 JP 5586347 B2 JP5586347 B2 JP 5586347B2 JP 2010151847 A JP2010151847 A JP 2010151847A JP 2010151847 A JP2010151847 A JP 2010151847A JP 5586347 B2 JP5586347 B2 JP 5586347B2
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dust cover
pulley
inner ring
diameter portion
attached
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JP2012013182A (en
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耕治 福田
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Bando Chemical Industries 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/18—Means for guiding or supporting belts, ropes, or chains
    • F16H7/20—Mountings for rollers or pulleys
    • 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
    • F16C33/80—Labyrinth sealings
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
    • 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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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pulleys (AREA)

Description

本発明は、プーリを取り付けるプーリ取付部に対し、それを覆うように取り付けられるプーリに関する。   The present invention relates to a pulley attached to a pulley attachment portion to which a pulley is attached so as to cover the pulley attachment portion.

従来より、オートテンショナのブラケット等に取り付けられるアイドラプーリが知られている。このようなアイドラプーリは、図３に示すように、ボス部２０２の軸方向高さｈ１と軸受２０７の軸方向高さｈ２とが同等（ｈ１≒ｈ２）であり、軸受２０７の内輪２０９の表面側に装着したダストカバー２１１によって軸受２０７の表面側が覆われていた。   2. Description of the Related Art Conventionally, an idler pulley that is attached to a bracket or the like of an auto tensioner is known. In such an idler pulley, as shown in FIG. 3, the axial height h1 of the boss portion 202 and the axial height h2 of the bearing 207 are equivalent (h1≈h2), and the surface of the inner ring 209 of the bearing 207 The surface side of the bearing 207 was covered with the dust cover 211 attached to the side.

しかしながら、このようなアイドラプーリ２０１では、軸受２０７の内輪２０９側へ水や粉塵が入り込むことは防ぐことができたものの、軸受２０７の外輪２０８側から水や粉塵が入り込むのを十分に防ぐことはできず、軸受シール部２１４まで水や粉塵が入り込むという問題があった。   However, with such an idler pulley 201, although water and dust can be prevented from entering the inner ring 209 side of the bearing 207, it is possible to sufficiently prevent water and dust from entering from the outer ring 208 side of the bearing 207. There was a problem that water and dust entered the bearing seal portion 214.

そこで、例えば、特許文献１に示す樹脂プーリでは、ボス部の表面側及び裏面側に全周にわたって突条を設け、この突条の近傍まで軸受内輪に嵌合したダストカバーを延長し、このダストカバーの外周端と突条との間の隙間でラビリンスシールを形成している。   Therefore, for example, in the resin pulley shown in Patent Document 1, protrusions are provided on the entire surface of the boss portion on the front surface side and the back surface side, and a dust cover fitted to the bearing inner ring is extended to the vicinity of the protrusions, and this dust is extended. A labyrinth seal is formed by a gap between the outer peripheral edge of the cover and the protrusion.

また、例えば特許文献２では、ボス部の端部を半径方向内側へ延長し、プーリを被取付部に固定する取付ボルトを締め付けるフランジ付きナットとの隙間でラビリンスシールを形成している。   For example, in Patent Document 2, a labyrinth seal is formed by a gap with a flanged nut that extends an end of a boss portion radially inward and fastens a mounting bolt that fixes a pulley to a mounted portion.

特開２００９−１７４６８３号公報JP 2009-174683 A 特開２００３−８３４０５号公報JP 2003-83405 A

しかしながら、上記特許文献１のプーリでは、ダストカバーが内輪に固定されているので、プーリと共に回転せず、一度ダストカバー上にのった粉塵や水滴が軸受に浸入しやすいという問題があった。   However, the pulley of Patent Document 1 has a problem that the dust cover is fixed to the inner ring, so that it does not rotate together with the pulley, and dust and water droplets once on the dust cover are liable to enter the bearing.

一方、上記特許文献２のプーリでは、プーリのボス部を延長してダストシールを形成していることから、ダストシール側に付着した粉塵や水は遠心力で飛ばされて軸受内に入りにくいが、内輪と共にプーリ被取付部に固定されるフランジ付きナットに付着した粉塵や水が、ナットのフランジとダストシールの内周面との間を通って軸受内に入り込むという問題は解決されていない。   On the other hand, in the pulley of Patent Document 2, the boss portion of the pulley is extended to form a dust seal, so that dust and water adhering to the dust seal side are blown away by centrifugal force and hardly enter the bearing. At the same time, the problem that dust or water adhering to the flanged nut fixed to the pulley attached portion passes between the flange of the nut and the inner peripheral surface of the dust seal and enters the bearing is not solved.

本発明は、かかる点に鑑みてなされたものであり、その目的とするところは、簡単な構成で水や粉塵が転がり軸受内に入り込むのを確実に防ぐことにある。   The present invention has been made in view of such points, and an object of the present invention is to reliably prevent water and dust from entering the rolling bearing with a simple configuration.

上記の目的を達成するために、この発明では、内輪に設けた第１ダストカバーを、その表面側から覆う円環状の第２ダストカバーをプーリ本体側に設けた。   In order to achieve the above object, in the present invention, an annular second dust cover that covers the first dust cover provided on the inner ring from the surface side thereof is provided on the pulley body side.

具体的には、第１の発明では、
プーリ被取付部に対し、該プーリ被取付部を覆うように取り付けられ、
内輪及び外輪を有する転がり軸受と、
上記外輪が嵌め込まれる円筒状のボス部、ベルトが当接する円環状の外周部及びボス部と外周部とを結ぶリブ部を備えたプーリ本体と、
上記内輪における表面側に嵌め込まれる円環状の第１ダストカバーとを備えたプーリを対象とする。 Specifically, in the first invention,
It is attached to the pulley attachment part so as to cover the pulley attachment part,
A rolling bearing having an inner ring and an outer ring;
A pulley body having a cylindrical boss portion into which the outer ring is fitted, an annular outer peripheral portion with which the belt abuts, and a rib portion connecting the boss portion and the outer peripheral portion;
A pulley including an annular first dust cover fitted on the surface side of the inner ring is an object.

そして、上記ボス部の軸方向高さは、上記転がり軸受の軸方向高さよりも高く、
上記第１ダストカバーの半径方向内側が上記内輪の内周面側に装着され、該第１ダストカバーの外周端が上記ボス部の内周面近傍まで伸び、
上記ボス部の外周に上記第１ダストカバーを該第１ダストカバーの表面側から覆う円環状の第２ダストカバーが設けられている。 And the axial height of the boss part is higher than the axial height of the rolling bearing,
The radially inner side of the first dust cover is attached to the inner peripheral surface side of the inner ring, and the outer peripheral end of the first dust cover extends to the vicinity of the inner peripheral surface of the boss part,
An annular second dust cover is provided on the outer periphery of the boss portion to cover the first dust cover from the surface side of the first dust cover.

上記の構成によると、内輪に嵌合させた第１ダストカバーを、その表面側からさらにプーリ本体のボス部外周に設けた第２ダストカバーで覆っているので、転がり軸受の軸方向だけでなく、半径方向からも水や粉塵が入り込みにくくなる。しかも、水や粉塵が掛かりやすい第２ダストカバーは、プーリ本体と共に回転するので、第２ダストカバーに掛かった水や粉塵は、遠心力によって半径方向外側へ飛ばされる。このため、プーリの回転により、さらに水や粉塵が入り込みにくくなる。さらに、第２ダストカバーをプーリ本体と別体としているので、ボス部に転がり軸受を嵌め込んだ後に第２ダストカバーをボス部の外周に嵌め込めばよく、組立が容易である。   According to the above configuration, the first dust cover fitted to the inner ring is covered with the second dust cover provided on the outer periphery of the boss portion of the pulley body from the surface side, so that not only the axial direction of the rolling bearing but also Water and dust are less likely to enter from the radial direction. In addition, the second dust cover that is likely to be splashed with water and dust rotates together with the pulley body, so that the water and dust that are caught on the second dust cover are blown outward in the radial direction by centrifugal force. For this reason, the rotation of the pulley further prevents water and dust from entering. Furthermore, since the second dust cover is separated from the pulley body, the second dust cover may be fitted to the outer periphery of the boss portion after the rolling bearing is fitted to the boss portion, and assembly is easy.

第２の発明では、第１の発明において、
上記プーリ本体は、鋳鉄よりなり、
上記第２ダストカバーは、冷間圧延鋼板よりなる。 In the second invention, in the first invention,
The pulley body is made of cast iron,
The second dust cover is made of a cold rolled steel plate.

上記の構成によると、鋳鉄の線膨張係数と、冷間圧延鋼板の線膨張係数とはほぼ等しく、プーリに熱が加わった場合でも、ボス部外周と第２ダストカバーとの間で隙間が広がることはなく、第２ダストカバーが緩むことはない。また、冷間圧延鋼板は、鋳鉄に比べてプレス加工や曲げ加工等が容易なので、第１ダストカバー等との隙間管理が容易である。   According to said structure, the linear expansion coefficient of cast iron and the linear expansion coefficient of a cold-rolled steel plate are substantially equal, and even when heat | fever is added to a pulley, a clearance gap spreads between a boss | hub part outer periphery and a 2nd dust cover. The second dust cover will not loosen. In addition, since cold-rolled steel sheets are easier to press and bend than cast iron, the gap management with the first dust cover and the like is easy.

第３の発明では、プーリ被取付部に対し、該プーリ被取付部を覆うように取り付けられ、
内輪及び外輪を有する転がり軸受と、
上記外輪が嵌め込まれる円筒状のボス部、ベルトが当接する円環状の外周部及びボス部と外周部とを結ぶリブ部を備えたプーリ本体と、
上記内輪における表面側に嵌め込まれる円環状の第１ダストカバーとを備えたプーリを対象とする。 In the third invention, the pulley attached portion is attached so as to cover the pulley attached portion,
A rolling bearing having an inner ring and an outer ring;
A pulley body having a cylindrical boss portion into which the outer ring is fitted, an annular outer peripheral portion with which the belt abuts, and a rib portion connecting the boss portion and the outer peripheral portion;
A pulley including an annular first dust cover fitted on the surface side of the inner ring is an object.

そして、上記ボス部の軸方向高さは、上記転がり軸受の軸方向高さよりも高く、
上記第１ダストカバーの半径方向内側が上記内輪の内周面側に装着され、該第１ダストカバーの外周端が上記ボス部の内周面近傍まで伸び、
上記ボス部の内周に設けた溝に上記第１ダストカバーを表面側から覆う円環状の第２ダストカバーが嵌め込まれている。 And the axial height of the boss part is higher than the axial height of the rolling bearing,
The radially inner side of the first dust cover is attached to the inner peripheral surface side of the inner ring, and the outer peripheral end of the first dust cover extends to the vicinity of the inner peripheral surface of the boss part,
An annular second dust cover that covers the first dust cover from the surface side is fitted into a groove provided on the inner periphery of the boss portion.

上記の構成によると、内輪に嵌合させた第１ダストカバーを、その表面側からさらにプーリ本体のボス部内周の溝に嵌め込んだ第２ダストカバーで覆っているので、転がり軸受の軸方向だけでなく、半径方向からも水や粉塵が入り込みにくくなる。しかも、水や粉塵が掛かりやすい第２ダストカバーは、プーリ本体と共に回転するので、第２ダストカバーに掛かった水や粉塵は、遠心力によって半径方向外側へ飛ばされる。このため、プーリの回転により、さらに水や粉塵が入り込みにくくなる。さらに、第２ダストカバーをプーリ本体と別体としているので、ボス部に転がり軸受を嵌め込んだ後に第２ダストカバーをボス部内周の溝に嵌め込めばよく、組立が容易である。   According to the above configuration, the first dust cover fitted to the inner ring is covered with the second dust cover fitted into the groove on the inner periphery of the boss portion of the pulley body from the surface side, so the axial direction of the rolling bearing Not only does this make it difficult for water and dust to enter from the radial direction. In addition, the second dust cover that is likely to be splashed with water and dust rotates together with the pulley body, so that the water and dust that are caught on the second dust cover are blown outward in the radial direction by centrifugal force. For this reason, the rotation of the pulley further prevents water and dust from entering. Further, since the second dust cover is separated from the pulley body, the second dust cover may be fitted into the groove on the inner periphery of the boss after the rolling bearing is fitted into the boss, and the assembly is easy.

第４の発明では、第３の発明において、
上記プーリ本体は、鋳鉄よりなり、
上記第２ダストカバーは、樹脂成形品よりなる。 In the fourth invention, in the third invention,
The pulley body is made of cast iron,
The second dust cover is made of a resin molded product.

上記の構成によると、樹脂の線膨張係数は、鋳鉄の線膨張係数に比べると大きく、プーリに熱が加わった場合に第２ダストカバーの外径が大きくなり、ボス部内周との間で締め代が増加して抜け止め効果が倍増する。また、樹脂成形品は、鋳鉄に比べて成形が容易なので、第１ダストカバー等との隙間管理が容易である。   According to the above configuration, the linear expansion coefficient of the resin is larger than the linear expansion coefficient of cast iron. When heat is applied to the pulley, the outer diameter of the second dust cover increases, and the resin is tightened between the inner periphery of the boss part. The cost increases and the retaining effect doubles. In addition, since the resin molded product is easier to mold than cast iron, it is easy to manage the gap with the first dust cover and the like.

第５の発明では、第１乃至第４のいずれか１つの発明において、
上記第１ダストカバーは、上記内輪を覆う部分よりも、上記外輪を覆う部分の方が軸方向で高い位置にある構成とする。 In a fifth invention, in any one of the first to fourth inventions,
The first dust cover is configured such that the portion covering the outer ring is higher in the axial direction than the portion covering the inner ring.

上記の構成によると、仮に第１ダストカバーの内輪を覆う側（半径方向内側）に水が浸入しても、外輪を覆う部分の方が軸方向で高い位置にあるので、表面張力により、さらに水が外輪側へ流れ込みにくくなり、軸受シール側への水の浸入が防止される。   According to the above configuration, even if water enters the side (radially inner side) of the first dust cover covering the inner ring, the portion covering the outer ring is at a higher position in the axial direction. It becomes difficult for water to flow into the outer ring side, preventing water from entering the bearing seal side.

第６の発明では、第１乃至第５のいずれか１つの発明において、
上記内輪は、該内輪の中心を通る取付ボルトで上記プーリ被取付部に取り付けられ、
上記取付ボルトの頭部は、小径部と大径部とを有する段付きの円板状頭部を備え、
上記小径部の上記プーリ被取付部側が上記第１ダストカバーの表面に当接した状態で、上記大径部が上記第２ダストカバーの少なくとも一部を該第２ダストカバーの表面側から覆い、該小径部の外周面と上記第２ダストカバーの内周面との間及び上記大径部の上記プーリ被取付部側の面と該第２ダストカバーの表面との間にラビリンスシールが形成されている。 In a sixth invention, in any one of the first to fifth inventions,
The inner ring is attached to the pulley attached portion with a mounting bolt passing through the center of the inner ring,
The head of the mounting bolt includes a stepped disk-shaped head having a small diameter portion and a large diameter portion,
The large diameter portion covers at least a part of the second dust cover from the surface side of the second dust cover in a state where the pulley attached portion side of the small diameter portion is in contact with the surface of the first dust cover, Labyrinth seals are formed between the outer peripheral surface of the small-diameter portion and the inner peripheral surface of the second dust cover and between the surface of the large-diameter portion on the pulley attachment portion side and the surface of the second dust cover. ing.

上記の構成によると、第２ダストカバーの半径方向内側をさらに取付ボルトの円板状頭部で覆うことで、円板状頭部と第１ダストカバー及び第２ダストカバーとの間でラビリンスシールが形成されるため、水や粉塵が一段と転がり軸受内部に入りにくくなる。   According to the above configuration, the labyrinth seal is provided between the disk-shaped head and the first dust cover and the second dust cover by further covering the inner side in the radial direction of the second dust cover with the disk-shaped head of the mounting bolt. Therefore, water and dust are more likely to roll and hardly enter the bearing.

第７の発明では、第６の発明において、
上記小径部は、大径部とは別体の座金よりなるものとする。 In a seventh invention, in the sixth invention,
The small diameter part is made of a washer separate from the large diameter part.

上記の構成によると、取付ボルトの成形が容易となる。   According to said structure, shaping | molding of an attachment bolt becomes easy.

以上説明したように、本発明によれば、内輪の内周面側に装着する第１ダストカバーの外周端をボス部の内周面近傍まで伸ばし、その第１ダストカバーを表面側から覆う円環状の第２ダストカバーをボス部に設けたことにより、簡単な構成で水やダストが転がり軸受内に入り込むのを確実に防ぐことができる。   As described above, according to the present invention, the outer periphery of the first dust cover mounted on the inner peripheral surface side of the inner ring is extended to the vicinity of the inner peripheral surface of the boss portion, and the first dust cover is covered from the surface side. By providing the annular second dust cover on the boss portion, it is possible to reliably prevent water and dust from rolling into the bearing with a simple configuration.

実施形態１にかかるプーリを拡大して示す断面図である。It is sectional drawing which expands and shows the pulley concerning Embodiment 1. FIG. 実施形態２にかかるプーリを拡大して示す断面図である。It is sectional drawing which expands and shows the pulley concerning Embodiment 2. FIG. 従来技術にかかるプーリを拡大して示す断面図である。It is sectional drawing which expands and shows the pulley concerning a prior art.

以下、本発明の実施形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（実施形態１）
図１は本発明の実施形態１のプーリ１を示し、このプーリ１は、オートテンショナのブラケット等を構成する円柱状のプーリ被取付部５０に対し、このプーリ被取付部５０を覆うように取り付けられる。詳細は図示しないが、プーリ１は、例えば、自動車のエンジンの取付面に取り付けるオートテンショナのブラケットに取り付けられる。このため、地面に対して特定の方向に取り付けられるわけではない。以降、プーリ被取付部５０を、その取付方向（図１の上方）から見たときを基準として、表面側、裏面側等の表現で方向を示す。 (Embodiment 1)
FIG. 1 shows a pulley 1 according to a first embodiment of the present invention. The pulley 1 is attached so as to cover the pulley attached portion 50 to a columnar pulley attached portion 50 constituting a bracket or the like of an auto tensioner. It is done. Although details are not shown, the pulley 1 is attached to, for example, a bracket of an auto tensioner attached to an attachment surface of an automobile engine. For this reason, it is not necessarily attached to a specific direction with respect to the ground. Hereinafter, the direction is indicated by expressions such as the front side and the back side, with the pulley attached portion 50 as viewed from the attachment direction (upward in FIG. 1).

このプーリ１は、円筒状のボス部２と、図示しないＶリブドベルトなどのベルトが当接する円環状の外周部３と、これらボス部２及び外周部３を結ぶリブ部４とを備えたプーリ本体５を備えている。外周部３は、例えば、Ｖリブドベルトのリブが嵌合するＶ字溝３ａが複数平行に形成されている。このプーリ本体５は、例えば、ＦＣ２５０などの鋳鉄よりなり、ボス部２の内周面２ａは機械加工により切削されている。本実施形態では、ボス部２の裏面側は一部小径となった外輪抜止め部２ｂが形成されている。   The pulley 1 includes a pulley body having a cylindrical boss portion 2, an annular outer peripheral portion 3 with which a belt such as a V-ribbed belt (not shown) abuts, and a rib portion 4 connecting the boss portion 2 and the outer peripheral portion 3. 5 is provided. In the outer peripheral portion 3, for example, a plurality of V-shaped grooves 3a into which the ribs of the V-ribbed belt are fitted are formed in parallel. The pulley body 5 is made of, for example, cast iron such as FC250, and the inner peripheral surface 2a of the boss portion 2 is cut by machining. In the present embodiment, an outer ring retaining portion 2b having a small diameter is formed on the back side of the boss portion 2.

ボス部２の内周面２ａには、転がり軸受としての玉軸受７の外輪８が圧入され、外輪８の裏面側が外輪抜止め部２ｂに当接して裏面側に抜けないようになっている。玉軸受７はさらに内輪９を備え、これら内輪９及び外輪８の間に転動体であるボール１０が配置されている。ボス部２の外輪抜け止め部２ｂを除く軸方向高さｈ１は、玉軸受７の軸方向高さｈ２よりも高くなっている（ｈ１＞ｈ２）。また、ボール１０は、外輪８と内輪９とに連結された一対の円環状の軸受シール１４で覆われている。   An outer ring 8 of a ball bearing 7 as a rolling bearing is press-fitted into the inner peripheral surface 2a of the boss part 2 so that the back surface side of the outer ring 8 is in contact with the outer ring retaining portion 2b so that it does not come out to the back surface side. The ball bearing 7 further includes an inner ring 9, and a ball 10 that is a rolling element is disposed between the inner ring 9 and the outer ring 8. The axial height h1 excluding the outer ring retaining portion 2b of the boss portion 2 is higher than the axial height h2 of the ball bearing 7 (h1> h2). The ball 10 is covered with a pair of annular bearing seals 14 connected to the outer ring 8 and the inner ring 9.

そして、内輪９の表面側には、円環状の第１ダストカバー１１が嵌め込まれている。具体的には、第１ダストカバー１１は、例えばＳＰＣＣ（冷間圧延鋼板）よりなり、その半径方向内側の円筒部が、内輪９の内周面９ａ側に圧入されている。そして、第１ダストカバー１１の外周端は、ボス部２の内周面２ａ近傍まで伸びている。第１ダストカバー１１の外周端とボス部２の内周面２ａとの間の隙間は、プーリ１の回転中に両者が接触しない程度に保たれていれば、できるだけ小さい方がよく、例えば、０．５ｍｍ〜１．０ｍｍ程度とする。この第１ダストカバー１１は、内輪９を覆う半径方向内側部１１ａよりも、外輪８を覆う半径方向外側部１１ｂの方が軸方向で高い位置にあるようにプレス加工等により成形されている。   An annular first dust cover 11 is fitted on the surface side of the inner ring 9. Specifically, the first dust cover 11 is made of, for example, SPCC (cold rolled steel plate), and the radially inner cylindrical portion is press-fitted to the inner peripheral surface 9 a side of the inner ring 9. Then, the outer peripheral end of the first dust cover 11 extends to the vicinity of the inner peripheral surface 2 a of the boss portion 2. The gap between the outer peripheral end of the first dust cover 11 and the inner peripheral surface 2a of the boss portion 2 is preferably as small as possible as long as the clearance between the outer periphery and the boss 2 is maintained so that they do not contact each other during rotation of the pulley 1. About 0.5 mm to 1.0 mm. The first dust cover 11 is formed by pressing or the like so that the radial outer portion 11b covering the outer ring 8 is higher in the axial direction than the radial inner portion 11a covering the inner ring 9.

そして、ボス部２の外周端には、第１ダストカバー１１をその表面側から覆う円環状の第２ダストカバー１２が嵌め込まれている。例えば第１ダストカバー１１の表面と第２ダストカバー１２裏面との間の隙間は、０．５ｍｍ〜１．０ｍｍ程度とする。第２ダストカバー１２は、例えば、ＳＰＣＣよりなる。ＳＰＣＣの線膨張係数は１１．７×１０−６ ／℃であり、プーリ本体５（ＦＣ２５０）の線膨張係数である１１．８×１０−６ ／℃とほぼ等しいことから、プーリ１に熱が加わった場合でも、ボス部２外周と第２ダストカバー１２との間で隙間が広がることはなく、第２ダストカバー１２が緩むことはない。   And the annular | circular shaped 2nd dust cover 12 which covers the 1st dust cover 11 from the surface side is inserted by the outer peripheral end of the boss | hub part 2. As shown in FIG. For example, the gap between the front surface of the first dust cover 11 and the back surface of the second dust cover 12 is about 0.5 mm to 1.0 mm. The second dust cover 12 is made of SPCC, for example. Since the linear expansion coefficient of SPCC is 11.7 × 10 −6 / ° C., which is almost equal to the linear expansion coefficient of the pulley body 5 (FC250), which is 11.8 × 10 −6 / ° C., heat is generated in the pulley 1. Even when added, the gap does not widen between the outer periphery of the boss part 2 and the second dust cover 12, and the second dust cover 12 does not loosen.

一方、内輪９の裏面側には、円環状の第３ダストカバー１３が嵌め込まれている。具体的には、この第３ダストカバー１３も、例えばＳＰＣＣよりなり、その半径方向内側円筒部が、内輪９の内周面９ａ側に装着されている。そして、第３ダストカバー１１３の半径方向中間部は、裏面側に第１ダストカバー１１に比べてさらに大きく折れ曲がり、外周端はボス部２の裏面側を超え、ボス部２の裏面側全体を覆うようにリブ部４側に折れ曲がっている。   On the other hand, an annular third dust cover 13 is fitted on the back side of the inner ring 9. Specifically, the third dust cover 13 is also made of, for example, SPCC, and the radially inner cylindrical portion thereof is mounted on the inner peripheral surface 9 a side of the inner ring 9. And the radial direction intermediate part of the 3rd dust cover 113 bends more largely than the 1st dust cover 11 in the back surface side, and an outer peripheral end exceeds the back surface side of the boss part 2, and covers the whole back surface side of the boss part 2. As shown, it is bent toward the rib 4 side.

第１ダストカバー１１、第２ダストカバー１２及び第３ダストカバー１３をそれぞれＳＰＣＣで成形しているので、鋳鉄に比べてプレス加工や曲げ加工等が容易であり、隙間管理が容易となっている。   Since the first dust cover 11, the second dust cover 12, and the third dust cover 13 are each formed by SPCC, press working and bending work are easier than in cast iron, and gap management is easy. .

また、内輪９は、この内輪９の中心を通る取付ボルト１５でプーリ被取付部５０に取り付けられている。この取付ボルト１５は、六角穴付きの円板状頭部１６を備え、この六角穴付きの円板状頭部１６は、六角穴が凹陥された大径部１６ａと、この大径部１６ａよりも径の小さい小径部１６ｂとが一体成形された段付きボルトよりなる。なお、小径部１６ｂに替え、この円板状頭部１６の大径部１６ａに相当する部分と第１ダストカバー１１との間に小径部１６ｂと同等の外径を有する座金を嵌め込んでもよい。一体型であれば部品点数が減って組立が容易であり、別体型であれば取付ボルト１５の成形が容易となる。   The inner ring 9 is attached to the pulley attached portion 50 with a mounting bolt 15 passing through the center of the inner ring 9. The mounting bolt 15 includes a disk-shaped head portion 16 having a hexagonal hole. The disk-shaped head portion 16 having a hexagonal hole includes a large-diameter portion 16a having a recessed hexagonal hole and a large-diameter portion 16a. And a small-diameter portion 16b having a small diameter and a stepped bolt integrally formed. In place of the small diameter portion 16b, a washer having an outer diameter equivalent to that of the small diameter portion 16b may be fitted between the portion corresponding to the large diameter portion 16a of the disk-shaped head portion 16 and the first dust cover 11. . If it is an integral type, the number of parts is reduced and assembly is easy, and if it is a separate type, the mounting bolt 15 can be easily molded.

このように構成されるプーリ１は、例えば次のような手順で組み立てられる。   The pulley 1 configured as described above is assembled by the following procedure, for example.

ます、ボス部２の表面側から玉軸受７を圧入し、玉軸受７の内輪９の表面側から第１ダストカバー１１を、裏面側から第３ダストカバー１３をそれぞれ圧入する。   First, the ball bearing 7 is press-fitted from the surface side of the boss portion 2, and the first dust cover 11 is press-fitted from the surface side of the inner ring 9 of the ball bearing 7, and the third dust cover 13 is press-fitted from the back side.

次いで、ボス部２の表面側から、その外周に第２ダストカバー１２を圧入する。これにより、プーリ１の組立が完成する。このとき、第２ダストカバー１２をプーリ本体５と別体としているので、玉軸受７をボス部２に嵌め込んだ後に第２ダストカバー１２をボス部２の外周に嵌め込めばよく、組立が容易となっている。   Next, the second dust cover 12 is press-fitted into the outer periphery from the surface side of the boss portion 2. Thereby, the assembly of the pulley 1 is completed. At this time, since the second dust cover 12 is separated from the pulley body 5, the second dust cover 12 may be fitted to the outer periphery of the boss portion 2 after the ball bearing 7 is fitted to the boss portion 2. It has become easy.

次いで、このプーリ１をプーリ被取付部５０に取り付けるには、まず、プーリ被取付部５０の表面側に第３ダストカバー１３の裏面を当接させてプーリ１を載置した状態で、プーリ被取付部５０のネジ穴に取付ボルト１５を締結する。これにより、小径部１６ｂの裏面側が第１ダストカバー１１の表面に当接し、プーリ１がプーリ被取付部５０に取り付けられる。   Next, in order to attach the pulley 1 to the pulley attached portion 50, first, the pulley cover is placed in a state where the rear surface of the third dust cover 13 is brought into contact with the front surface side of the pulley attached portion 50 and the pulley 1 is placed. The mounting bolt 15 is fastened to the screw hole of the mounting portion 50. Thereby, the back surface side of the small diameter portion 16 b abuts on the surface of the first dust cover 11, and the pulley 1 is attached to the pulley attached portion 50.

この取付状態で、大径部１６ａが第２ダストカバー１２の半径方向内側表面との間に０．５ｍｍ〜１．０ｍｍ程度の隙間を保ったまま、この第２ダストカバー１２をその表面側から覆っている。このことで、小径部１６ｂの外周面と第２ダストカバー１２の内周面との間及び大径部１６ａの裏面と第２ダストカバー１２の表面との間に０．５ｍｍ〜１．０ｍｍ程度の隙間よりなるラビリンスシール１７が形成される。   In this mounted state, the large diameter portion 16a is kept from the surface side while maintaining a gap of about 0.5 mm to 1.0 mm between the large diameter portion 16a and the radially inner surface of the second dust cover 12. Covering. Thus, between the outer peripheral surface of the small diameter portion 16 b and the inner peripheral surface of the second dust cover 12 and between the back surface of the large diameter portion 16 a and the surface of the second dust cover 12, about 0.5 mm to 1.0 mm. A labyrinth seal 17 composed of the gap is formed.

次に、本実施形態にかかるプーリ１の作用について説明する。   Next, the operation of the pulley 1 according to the present embodiment will be described.

上記取付状態では、内輪９に嵌合させた第１ダストカバー１１を、その表面側からさらにプーリ本体５のボス部２外周に設けた第２ダストカバー１２で覆っているので、玉軸受７の軸方向だけでなく、半径方向からも水や粉塵が入り込みにくくなる。   In the mounted state, the first dust cover 11 fitted to the inner ring 9 is covered with the second dust cover 12 provided on the outer periphery of the boss portion 2 of the pulley body 5 from the surface side. Water and dust are less likely to enter from the radial direction as well as the axial direction.

しかも、水や粉塵が掛かりやすい第２ダストカバー１２は、プーリ本体５と共に回転するので、この第２ダストカバー１２の表面に掛かった水や粉塵は、遠心力によって半径方向外側へ飛ばされる。このため、プーリ１の回転により、さらに水や粉塵が入り込みにくくなる。   In addition, since the second dust cover 12 that is susceptible to water and dust rotates with the pulley body 5, the water and dust applied to the surface of the second dust cover 12 are blown outward in the radial direction by centrifugal force. For this reason, the rotation of the pulley 1 makes it difficult for water and dust to enter.

また、第１ダストカバー１１は、内輪９を覆う半径方向内側部１１ａよりも、外輪８を覆う半径方向外側部１１ｂの方が軸方向で高い位置にあるので、プーリ本体５に力が加わって上下にずれた外輪８が第１ダストカバー１１に接触しないだけでなく、仮に第１ダストカバー１１の半径方向内側部１１ａ側に水が浸入しても、半径方向外側部１１ｂが軸方向で高い位置にあるので、表面張力により、さらに水が外輪８側へ流れ込みにくくなり、軸受シール側への水の浸入が確実に防止される。   Further, since the first dust cover 11 is higher in the axial direction in the radial outer portion 11b covering the outer ring 8 than in the radial inner portion 11a covering the inner ring 9, a force is applied to the pulley body 5. Not only does the outer ring 8 displaced vertically not contact the first dust cover 11, but even if water enters the radial inner part 11a side of the first dust cover 11, the radial outer part 11b is higher in the axial direction. Since it is in the position, the surface tension makes it difficult for water to flow further to the outer ring 8 side, and water intrusion to the bearing seal side is reliably prevented.

また、第２ダストカバー１２の少なくとも一部をさらに取付ボルト１５の円板状頭部１６で覆うことで、円板状頭部１６と第１ダストカバー１１及び第２ダストカバー１２との間でさらにラビリンスシール１７が形成されているため、水や粉塵が一段と玉軸受７内部に入りにくくなる。   Further, by covering at least a part of the second dust cover 12 with the disk-shaped head 16 of the mounting bolt 15, between the disk-shaped head 16 and the first dust cover 11 and the second dust cover 12. Further, since the labyrinth seal 17 is formed, water and dust are less likely to enter the ball bearing 7.

しかも、第３ダストカバー１３の外周端がボス部２の裏面側を超えてボス部２の裏面側全体を覆っているので、玉軸受７の裏面からも玉軸受７内に水や粉塵が入り込みにくい。   Moreover, since the outer peripheral end of the third dust cover 13 extends beyond the back surface side of the boss portion 2 and covers the entire back surface side of the boss portion 2, water and dust enter the ball bearing 7 from the back surface of the ball bearing 7. Hateful.

したがって、本実施形態にかかるプーリ１によると、内輪９の内周面９ａ側に装着する第１ダストカバー１１の外周端をボス部２の内周面２ａ近傍まで伸ばし、その第１ダストカバー１１を表面側から覆う円環状の第２ダストカバー１２をボス部２に設けたことにより、簡単な構成で水やダストが玉軸受７内に入り込むのを確実に防ぐことができる。   Therefore, according to the pulley 1 according to the present embodiment, the outer peripheral end of the first dust cover 11 mounted on the inner peripheral surface 9a side of the inner ring 9 is extended to the vicinity of the inner peripheral surface 2a of the boss portion 2, and the first dust cover 11 By providing the annular second dust cover 12 covering the surface from the surface side on the boss portion 2, it is possible to reliably prevent water and dust from entering the ball bearing 7 with a simple configuration.

（実施形態２）
図２は本発明の実施形態２を示し、第２ダストカバー１１２の構成が異なる点で上記実施形態１と異なる。なお、本実施形態では、図１と同じ部分については同じ符号を付してその詳細な説明は省略する。 (Embodiment 2)
FIG. 2 shows Embodiment 2 of the present invention, which differs from Embodiment 1 in that the configuration of the second dust cover 112 is different. In the present embodiment, the same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

すなわち、本実施形態のプーリ１０１では、ボス部２の表面側の内周面２ａには、全周にわたって溝部２ｃが形成されている。この溝部２ｃには、第１ダストカバー１１の外周側を表面側から覆う円環状の第２ダストカバー１１２が嵌め込まれている。この第２ダストカバー１１２は、例えば、６６ナイロンのガラス繊維強化プラスチックよりなり、その線膨張係数は、４０．０×１０−６ ／℃となっている。第２ダストカバー１２の線膨張係数は、プーリ本体５の線膨張係数に比べると大きくなっている。   That is, in the pulley 101 of this embodiment, the groove part 2c is formed in the inner peripheral surface 2a of the surface side of the boss | hub part 2 over the perimeter. An annular second dust cover 112 that covers the outer peripheral side of the first dust cover 11 from the surface side is fitted into the groove 2c. The second dust cover 112 is made of, for example, 66 nylon glass fiber reinforced plastic, and has a linear expansion coefficient of 40.0 × 10 −6 / ° C. The linear expansion coefficient of the second dust cover 12 is larger than the linear expansion coefficient of the pulley body 5.

例えば、オートテンショナは、自動車のエンジンに取り付けられるので、高温の環境下に曝されることが多い。このような場合にプーリ１０１に熱が加わると、第２ダストカバー１１２の線膨張係数は、プーリ本体５の線膨張係数に比べると大きいので、第２ダストカバー１１２が膨らんで、その外径が大きくなろうとする。第２ダストカバー１１２は、溝部２ｃにしっかりと嵌り込んでいるので緩むことなく、むしろ溝部２ｃとの間で締め代が増加して抜け止め効果が倍増する、という効果を奏する。   For example, since an auto tensioner is attached to an automobile engine, it is often exposed to a high temperature environment. In such a case, when heat is applied to the pulley 101, the linear expansion coefficient of the second dust cover 112 is larger than the linear expansion coefficient of the pulley body 5, so that the second dust cover 112 swells and its outer diameter is increased. Try to get bigger. Since the second dust cover 112 is firmly fitted in the groove 2c, the second dust cover 112 is not loosened, but rather has an effect that the tightening margin increases with the groove 2c and the retaining effect is doubled.

そして、本実施形態においても、第２ダストカバー１１２をプーリ本体５と別体としているので、ボス部２に玉軸受７を嵌め込んだ後に第２ダストカバー１１２をボス部２の溝部２ｃに嵌め込めばよく、組立が容易である。   Also in this embodiment, since the second dust cover 112 is separated from the pulley body 5, the second dust cover 112 is fitted into the groove 2 c of the boss 2 after the ball bearing 7 is fitted into the boss 2. It can be assembled easily.

したがって、本実施形態でも、簡単な構成で水やダストが玉軸受７内に入り込むのを確実に防ぐことができる。   Therefore, even in this embodiment, water and dust can be reliably prevented from entering the ball bearing 7 with a simple configuration.

（その他の実施形態）
本発明は、上記実施形態について、以下のような構成としてもよい。 (Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

すなわち、上記実施形態では、プーリ１は、オートテンショナ用のプーリとしたが、これに限定されず、プーリ被取付部５０に対し、このプーリ被取付部５０を覆うように取り付けられる、転がり軸受を備えたプーリであればよい。   That is, in the said embodiment, although the pulley 1 was used as the pulley for auto tensioners, it is not limited to this, The rolling bearing attached so that this pulley attached part 50 may be covered with respect to the pulley attached part 50 is provided. Any pulley provided may be used.

上記実施形態では、転がり軸受は玉軸受７としたが、ころ軸受等でもよい。   In the above embodiment, the ball bearing 7 is used as the rolling bearing, but a roller bearing or the like may be used.

上記実施形態では、プーリ本体５をＦＣ２５０としたが、これに限定されず、ダクタイル鋳鉄等の鋳物としてもよい。また、鋳造品以外の他の金属製品を使用してもよく、その場合には、第２ダストカバー１２，１１２との線膨張係数の差が第２ダストカバー１２，１１２を緩める方向に作用しないように適宜材料を設定すればよい。   In the said embodiment, although the pulley main body 5 was FC250, it is not limited to this, It is good also as castings, such as ductile cast iron. Moreover, you may use metal products other than a casting product, and in that case, the difference of a linear expansion coefficient with the 2nd dust covers 12 and 112 does not act on the direction which loosens the 2nd dust covers 12 and 112. The material may be set as appropriate.

また、上記実施形態では、第１ダストカバー１１、第２ダストカバー１２及び第３ダストカバー１３をＳＰＣＣとしたが、他の金属材料や強化繊維プラスチックで構成してもよい。   Moreover, in the said embodiment, although the 1st dust cover 11, the 2nd dust cover 12, and the 3rd dust cover 13 were made into SPCC, you may comprise with another metal material and a reinforced fiber plastic.

なお、以上の実施形態は、本質的に好ましい例示であって、本発明、その適用物や用途の範囲を制限することを意図するものではない。   In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

１ プーリ
２ ボス部
２ａ 内周面
２ｃ 溝部
３ 外周部
４ リブ部
５ プーリ本体
７ 玉軸受（転がり軸受）
８ 外輪
９ 内輪
９ａ 内周面
１１ 第１ダストカバー
１１ａ 半径方向内側部
１１ｂ 半径方向外側部
１２ 第２ダストカバー
１５ 取付ボルト
１６ 円板状頭部
１６ａ 大径部
１６ｂ 小径部
１７ ラビリンスシール
５０ プーリ被取付部
１１２ 第２ダストカバー DESCRIPTION OF SYMBOLS 1 Pulley 2 Boss part 2a Inner peripheral surface 2c Groove part 3 Outer peripheral part 4 Rib part 5 Pulley body 7 Ball bearing (rolling bearing)
DESCRIPTION OF SYMBOLS 8 Outer ring 9 Inner ring 9a Inner peripheral surface 11 1st dust cover 11a Radial inner side part 11b Radial outer side part 12 Second dust cover 15 Mounting bolt 16 Disc-shaped head part 16a Large diameter part 16b Small diameter part 17 Labyrinth seal 50 Pulley cover Mounting part 112 Second dust cover

Claims (6)

プーリ被取付部に対し、該プーリ被取付部を覆うように取り付けられ、
内輪及び外輪を有する転がり軸受と、
上記外輪が嵌め込まれる円筒状のボス部、ベルトが当接する円環状の外周部及びボス部と外周部とを結ぶリブ部を備えたプーリ本体と、
上記内輪における表面側に嵌め込まれる円環状の第１ダストカバーとを備えたプーリであって、
上記ボス部の軸方向高さは、上記転がり軸受の軸方向高さよりも高く、
上記第１ダストカバーの半径方向内側が上記内輪の内周面側に装着され、該第１ダストカバーの外周端が上記ボス部の内周面近傍まで伸び、
上記ボス部の外周に上記第１ダストカバーを該第１ダストカバーの表面側から覆う円環状の第２ダストカバーが設けられており、
上記内輪は、該内輪の中心を通る取付ボルトで上記プーリ被取付部に取り付けられ、
上記取付ボルトの頭部は、小径部と大径部とを有する段付きの円板状頭部を備え、
上記小径部の上記プーリ被取付部側が上記第１ダストカバーの表面に当接した状態で、上記大径部が上記第２ダストカバーの少なくとも一部を該第２ダストカバーの表面側から覆い、該小径部の外周面と上記第２ダストカバーの内周面との間及び上記大径部の上記プーリ被取付部側の面と該第２ダストカバーの表面との間にラビリンスシールが形成されている
ことを特徴とするプーリ。 It is attached to the pulley attachment part so as to cover the pulley attachment part,
A rolling bearing having an inner ring and an outer ring;
A pulley body having a cylindrical boss portion into which the outer ring is fitted, an annular outer peripheral portion with which the belt abuts, and a rib portion connecting the boss portion and the outer peripheral portion;
A pulley having an annular first dust cover fitted on the surface side of the inner ring,
The axial height of the boss part is higher than the axial height of the rolling bearing,
The radially inner side of the first dust cover is attached to the inner peripheral surface side of the inner ring, and the outer peripheral end of the first dust cover extends to the vicinity of the inner peripheral surface of the boss part,
An annular second dust cover that covers the first dust cover from the surface side of the first dust cover is provided on the outer periphery of the boss portion ;
The inner ring is attached to the pulley attached portion with a mounting bolt passing through the center of the inner ring,
The head of the mounting bolt includes a stepped disk-shaped head having a small diameter portion and a large diameter portion ,
The large diameter portion covers at least a part of the second dust cover from the surface side of the second dust cover in a state where the pulley attached portion side of the small diameter portion is in contact with the surface of the first dust cover, Labyrinth seals are formed between the outer peripheral surface of the small-diameter portion and the inner peripheral surface of the second dust cover and between the surface of the large-diameter portion on the pulley attachment portion side and the surface of the second dust cover. pulleys, characterized by that. 請求項１に記載のプーリにおいて、
上記プーリ本体は、鋳鉄よりなり、
上記第２ダストカバーは、冷間圧延鋼板よりなる
ことを特徴とするプーリ。 The pulley according to claim 1, wherein
The pulley body is made of cast iron,
The said 2nd dust cover consists of cold rolled steel plates, The pulley characterized by the above-mentioned. プーリ被取付部に対し、該プーリ被取付部を覆うように取り付けられ、
内輪及び外輪を有する転がり軸受と、
上記外輪が嵌め込まれる円筒状のボス部、ベルトが当接する円環状の外周部及びボス部と外周部とを結ぶリブ部を備えたプーリ本体と、
上記内輪における表面側に嵌め込まれる円環状の第１ダストカバーとを備えたプーリであって、
上記ボス部の軸方向高さは、上記転がり軸受の軸方向高さよりも高く、
上記第１ダストカバーの半径方向内側が上記内輪の内周面側に装着され、該第１ダストカバーの外周端が上記ボス部の内周面近傍まで伸び、
上記ボス部の内周に設けた溝に上記第１ダストカバーを表面側から覆う円環状の第２ダストカバーが嵌め込まれており、
上記内輪は、該内輪の中心を通る取付ボルトで上記プーリ被取付部に取り付けられ、
上記取付ボルトの頭部は、小径部と大径部とを有する段付きの円板状頭部を備え、
上記小径部の上記プーリ被取付部側が上記第１ダストカバーの表面に当接した状態で、上記大径部が上記第２ダストカバーの少なくとも一部を該第２ダストカバーの表面側から覆い、該小径部の外周面と上記第２ダストカバーの内周面との間及び上記大径部の上記プーリ被取付部側の面と該第２ダストカバーの表面との間にラビリンスシールが形成されている
ことを特徴とするプーリ。 It is attached to the pulley attachment part so as to cover the pulley attachment part,
A rolling bearing having an inner ring and an outer ring;
A pulley body having a cylindrical boss portion into which the outer ring is fitted, an annular outer peripheral portion with which the belt abuts, and a rib portion connecting the boss portion and the outer peripheral portion;
A pulley having an annular first dust cover fitted on the surface side of the inner ring,
The axial height of the boss part is higher than the axial height of the rolling bearing,
The radially inner side of the first dust cover is attached to the inner peripheral surface side of the inner ring, and the outer peripheral end of the first dust cover extends to the vicinity of the inner peripheral surface of the boss part,
An annular second dust cover that covers the first dust cover from the surface side is fitted in a groove provided on the inner periphery of the boss portion ;
The inner ring is attached to the pulley attached portion with a mounting bolt passing through the center of the inner ring,
The head of the mounting bolt includes a stepped disk-shaped head having a small diameter portion and a large diameter portion ,
The large diameter portion covers at least a part of the second dust cover from the surface side of the second dust cover in a state where the pulley attached portion side of the small diameter portion is in contact with the surface of the first dust cover, Labyrinth seals are formed between the outer peripheral surface of the small-diameter portion and the inner peripheral surface of the second dust cover and between the surface of the large-diameter portion on the pulley attachment portion side and the surface of the second dust cover. pulleys, characterized by that. 請求項３に記載のプーリにおいて、
上記プーリ本体は、鋳鉄よりなり、
上記第２ダストカバーは、樹脂成形品よりなる
ことを特徴とするプーリ。 The pulley according to claim 3,
The pulley body is made of cast iron,
The pulley according to claim 2, wherein the second dust cover is made of a resin molded product. 請求項１乃至４のいずれか１つに記載のプーリにおいて、
上記第１ダストカバーは、上記内輪を覆う部分よりも、上記外輪を覆う部分の方が軸方向で高い位置にある
ことを特徴とするプーリ。 The pulley according to any one of claims 1 to 4,
The first dust cover is a pulley in which a portion covering the outer ring is at a higher position in the axial direction than a portion covering the inner ring. 請求項１乃至５のいずれか１つに記載のプーリにおいて、
上記小径部は、上記大径部とは別体の座金よりなる
ことを特徴とするプーリ。 The pulley according to any one of claims 1 to 5 ,
The pulley, wherein the small-diameter portion is made of a washer separate from the large-diameter portion.
JP2010151847A 2010-07-02 2010-07-02 Pulley Expired - Fee Related JP5586347B2 (en)

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JP2005337446A (en) * 2004-05-28 2005-12-08 Ntn Corp Sealing type rolling bearing
DE102004037202A1 (en) * 2004-07-30 2006-03-23 Ina-Schaeffler Kg Protective element for a bearing
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