JP6359251B2 - Idler pulley support device - Google Patents

Idler pulley support device Download PDF

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JP6359251B2
JP6359251B2 JP2013145270A JP2013145270A JP6359251B2 JP 6359251 B2 JP6359251 B2 JP 6359251B2 JP 2013145270 A JP2013145270 A JP 2013145270A JP 2013145270 A JP2013145270 A JP 2013145270A JP 6359251 B2 JP6359251 B2 JP 6359251B2
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idler pulley
rim
support device
rolling bearing
diameter
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JP2015017666A (en
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渡辺　一弘
一弘 渡辺
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NTN Corp
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NTN Corp
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Priority to PCT/JP2014/068402 priority patent/WO2015005416A1/en
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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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/32—Friction members
    • F16H55/36—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
    • 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
    • F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a race
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/447—Labyrinth packings
    • F16J15/4472—Labyrinth packings with axial path
    • 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 Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Sealing Of Bearings (AREA)

Description

この発明は、エンジン補機駆動用ベルトの移動を案内するアイドラプーリの支持装置に関する。   The present invention relates to an idler pulley support device for guiding the movement of an engine accessory driving belt.

自動車エンジンの補機駆動用ベルトの移動を案内するアイドラプーリは、普通、エンジンブロックに固定されるスリーブに転がり軸受を介して回転自在に支持される。   An idler pulley that guides the movement of an accessory driving belt of an automobile engine is normally rotatably supported by a sleeve fixed to the engine block via a rolling bearing.

上記のようなアイドラプーリの支持装置において、転がり軸受が外部に露出していると、飛来してくる異物との衝突によって転がり軸受が損傷する可能性があり、また、水や塵埃等の異物が軸受内部に侵入して、転がり軸受を早期に損傷させることになるため、異物の衝突や侵入の防止対策を採る必要がある。   In the above-described idler pulley support device, if the rolling bearing is exposed to the outside, the rolling bearing may be damaged due to a collision with a flying foreign object, and foreign substances such as water and dust may be damaged. Since it enters the bearing and damages the rolling bearing at an early stage, it is necessary to take measures to prevent collision and intrusion of foreign matter.

特許文献１に記載されたアイドラプーリの支持装置においては、スリーブによって内径部が支持される一対のダストカバーの組み付けにより転がり軸受の両側面を覆うようにしている。   In the idler pulley support device described in Patent Document 1, both side surfaces of the rolling bearing are covered by assembling a pair of dust covers whose inner diameter portions are supported by a sleeve.

特開２００３−１９４０７７号公報JP 2003-194077 A

ところで、特許文献１に記載されたアイドラプーリの支持装置においては、一対のダストカバーのそれぞれ外周部に内向きの円筒部を設け、その円筒部とアイドラプーリの内径面間に微小間隙を設けるようにしているため、水等の異物の侵入を効果的に防止することができるが、異物が一旦侵入すると、上記円筒部が異物の径方向外方への移動を阻害して外部にスムーズに排出させることができず、滞留異物の軸受内部への侵入によって転がり軸受の寿命に影響を与えることになる。   By the way, in the idler pulley support device described in Patent Document 1, an inward cylindrical portion is provided on each outer peripheral portion of the pair of dust covers, and a minute gap is provided between the cylindrical portion and the inner diameter surface of the idler pulley. Therefore, it is possible to effectively prevent the entry of foreign matters such as water, but once the foreign matter has entered, the cylindrical part obstructs the movement of the foreign matter radially outward and smoothly discharges to the outside. The life of the rolling bearing is affected by the entry of stagnant foreign matter into the bearing.

この発明の課題は、ダストカバー内に水等の異物が侵入した際、その侵入異物を外部にスムーズに排出することができるようにして、アイドラプーリを支持する転がり軸受の耐久性の低下を抑制することである。   The object of the present invention is to prevent the entry of foreign matter such as water into the dust cover and to smoothly discharge the foreign matter to the outside, thereby suppressing the deterioration of the durability of the rolling bearing that supports the idler pulley. It is to be.

上記の課題を解決するため、第１の発明においては、静止部材に固定されるスリーブの外周に転がり軸受を介してアイドラプーリを回転自在に支持し、前記スリーブによって内径部が支持され、外周部が前記アイドラプーリのリム内径面と微小間隙をおいて対向配置される一対の環状のダストカバーにより前記転がり軸受の両側面を覆うようにしたアイドラプーリの支持装置において、前記一対のダストカバーにおける内側面のそれぞれ外周部にテーパ面を設けた構成を採用したのである。   In order to solve the above problems, in the first invention, an idler pulley is rotatably supported on the outer periphery of a sleeve fixed to a stationary member via a rolling bearing, and an inner diameter portion is supported by the sleeve. The idler pulley support device is configured to cover both side surfaces of the rolling bearing with a pair of annular dust covers disposed to face the inner surface of the rim of the idler pulley with a minute gap therebetween. The structure which provided the taper surface in each outer peripheral part of the side surface was employ | adopted.

上記の構成からなるアイドラプーリの支持装置において、ダストカバーと転がり軸受の対向部間に異物が侵入すると、その異物は、アイドラプーリの回転による遠心力により径方向外方に向けて移動し、ダストカバーの外周部に設けられたテーパ面で案内されて、ダストカバーの外周とリムの内径面間に形成された微小間隙から外部に排出されることになり、侵入異物を滞留させることなく外部にスムーズに排出させることができる。   In the idler pulley support device having the above-described configuration, when foreign matter enters between the facing portions of the dust cover and the rolling bearing, the foreign matter moves radially outward due to centrifugal force due to rotation of the idler pulley, Guided by the taper surface provided on the outer periphery of the cover, it will be discharged to the outside through a minute gap formed between the outer periphery of the dust cover and the inner surface of the rim, so that no foreign matter stays outside. It can be discharged smoothly.

ここで、アイドラプーリにおけるリムの内径面両端部に開口端を大径端とするテーパ面を設けると、侵入異物を外部によりスムーズに排出させることができる。   Here, when the tapered surfaces having the open ends as the large-diameter ends are provided at both end portions of the inner surface of the rim of the idler pulley, the invading foreign matter can be smoothly discharged to the outside.

上記の課題を解決するため、第２の発明においては、静止部材に固定されるスリーブの外周に転がり軸受を介してアイドラプーリを回転自在に支持し、前記スリーブによって内径部が支持され、外周部が前記アイドラプーリのリム内径面と微小間隙をおいて対向配置される一対の環状のダストカバーにより前記転がり軸受の両側面を覆うようにしたアイドラプーリの支持装置において、前記アイドラプーリにおけるリムの内周両端部に開口端を大径端とするテーパ面を設けた構成を採用したのである。   In order to solve the above problems, in the second invention, an idler pulley is rotatably supported on the outer periphery of a sleeve fixed to a stationary member via a rolling bearing, and an inner diameter portion is supported by the sleeve. The idler pulley support device is configured to cover both side surfaces of the rolling bearing with a pair of annular dust covers arranged to face the inner surface of the rim of the idler pulley with a minute gap. The structure which provided the taper surface which makes an opening end the large diameter end in the circumferential both ends was employ | adopted.

上記第２の発明においても、アイドラプーリの回転による遠心力によって径方向外方に向けて移動する侵入異物をリムの内周両端部に設けられたテーパ面で外部にスムーズに誘導することができ、第１の発明と同様に、侵入異物を外部にスムーズに排出させることができる。   Also in the second aspect of the invention, the invading foreign matter that moves outward in the radial direction by the centrifugal force generated by the rotation of the idler pulley can be smoothly guided to the outside by the tapered surfaces provided at both inner peripheral ends of the rim. As in the first invention, the invading foreign matter can be smoothly discharged to the outside.

ここで、ダストカバーの外周部に設けられるテーパ面やリムの内周両端部に設けられるテーパ面は、その断面形状で直線とされたものであってもよく、あるいは、凹曲線とされたものであってもよい。   Here, the taper surface provided on the outer periphery of the dust cover and the taper surfaces provided on both ends of the inner periphery of the rim may be linear in the cross-sectional shape, or may be a concave curve. It may be.

第１の発明のように、ダストカバーの外周部にテーパ面を設け、あるいは、第２の発明のように、リムの内周両端部にテーパ面を設けたことにより、侵入異物を滞留させることなく外部にスムーズに排出することができ、異物の侵入による転がり軸受の耐久性の低下を抑制することができる。   As in the first aspect of the invention, the outer surface of the dust cover is provided with a tapered surface, or as in the second aspect of the invention, the tapered surface is provided at both ends of the inner periphery of the rim so as to retain intruding foreign matter. Therefore, it can be smoothly discharged to the outside, and the deterioration of the durability of the rolling bearing due to the entry of foreign matter can be suppressed.

この発明に係るアイドラプーリの支持装置の第１の実施の形態を断面図Sectional drawing of 1st Embodiment of the support apparatus of the idler pulley which concerns on this invention この発明に係るアイドラプーリの支持装置の第２の実施の形態を断面図Sectional drawing of 2nd Embodiment of the support apparatus of the idler pulley which concerns on this invention この発明に係るアイドラプーリの支持装置の第３の実施の形態を断面図Sectional drawing of 3rd Embodiment of the support apparatus of the idler pulley which concerns on this invention この発明に係るアイドラプーリの支持装置の第４の実施の形態を断面図Sectional drawing of 4th Embodiment of the support apparatus of the idler pulley which concerns on this invention この発明に係るアイドラプーリの支持装置の第５の実施の形態を断面図Sectional drawing of 5th Embodiment of the support apparatus of the idler pulley which concerns on this invention この発明に係るアイドラプーリの支持装置の第６の実施の形態を断面図Sectional drawing of 6th Embodiment of the support apparatus of the idler pulley which concerns on this invention

以下、この発明の実施の形態を図面に基づいて説明する。図１は、この発明に係るアイドラプーリの支持装置の第１実施の形態を示す。図示のように、静止部材としてのエンジンブロック１にはねじ孔２が形成され、そのねじ孔２にねじ係合されたボルト３の締付けによってスリーブ１０が固定されている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of an idler pulley support device according to the present invention. As shown in the figure, a screw hole 2 is formed in the engine block 1 as a stationary member, and a sleeve 10 is fixed by tightening a bolt 3 screwed into the screw hole 2.

スリーブ１０は、一端部にフランジ１１を有し、そのフランジ１１がエンジンブロック１と対向し、その対向部間にワッシャ１２が組み込まれている。ボルト３は、スリーブ１０の内側からワッシャ１２の中心孔に挿通されてねじ孔２にねじ係合されている。   The sleeve 10 has a flange 11 at one end, the flange 11 faces the engine block 1, and a washer 12 is incorporated between the facing portions. The bolt 3 is inserted into the center hole of the washer 12 from the inside of the sleeve 10 and screwed into the screw hole 2.

スリーブ１０の外側には転がり軸受２０が嵌合され、その転がり軸受２０によってアイドラプーリ３０が回転自在に支持されている。   A rolling bearing 20 is fitted to the outside of the sleeve 10, and an idler pulley 30 is rotatably supported by the rolling bearing 20.

アイドラプーリ３０は、ベルトが巻き掛けられるリム３１と、そのリム３１の内径面中央部に設けられた環状板部３２と、その環状板部３２の内径部に設けられた内筒部３３を有し、上記環状板部３２の軸方向両側において、内筒部３３の外径面とリム３１の内周両端部間に一対の環状空間３４が設けられている。   The idler pulley 30 has a rim 31 around which the belt is wound, an annular plate portion 32 provided at the center of the inner surface of the rim 31, and an inner cylinder portion 33 provided at the inner diameter portion of the annular plate portion 32. A pair of annular spaces 34 are provided between the outer diameter surface of the inner cylindrical portion 33 and both inner peripheral end portions of the rim 31 on both axial sides of the annular plate portion 32.

内筒部３３の内周は軸受嵌合面３５とされ、その軸受嵌合面３５内に転がり軸受２０の外輪外径面が圧入されている。また、内筒部３３の一端部には内向きフランジ３６が設けられ、その内向きフランジ３６によって転がり軸受２０の圧入量が規制されている。   The inner periphery of the inner cylindrical portion 33 is a bearing fitting surface 35, and the outer ring outer diameter surface of the rolling bearing 20 is press-fitted into the bearing fitting surface 35. Further, an inward flange 36 is provided at one end portion of the inner cylindrical portion 33, and the press-fitting amount of the rolling bearing 20 is regulated by the inward flange 36.

転がり軸受２０の軸方向の両側には一対のダストカバー４０ａ、４０ｂが設けられている。一対のダストカバー４０ａ、４０ｂのそれぞれは環状をなし、その内径部に皿状の屈曲部４１が設けられている。   A pair of dust covers 40 a and 40 b are provided on both sides in the axial direction of the rolling bearing 20. Each of the pair of dust covers 40a and 40b has an annular shape, and a dish-shaped bent portion 41 is provided on the inner diameter portion thereof.

一対のダストカバー４０ａ、４０ｂにおいて、一方のダストカバー４０ａはスリーブ１０に嵌合され、屈曲部４１の内周部がスリーブ１０のフランジ１１と転がり軸受２０の内輪とで軸方向の両側から挟持されて固定の支持とされている。他方のダストカバー４０ｂはスリーブ１０のアウタ側の端面に屈曲部４１の内周部が衝合され、その屈曲部４１の内周部が上記スリーブ１０の端面とボルト３の頭部３ａにより軸方向の両側から挟持されて固定の支持とされている。   In the pair of dust covers 40 a and 40 b, one dust cover 40 a is fitted to the sleeve 10, and the inner peripheral portion of the bent portion 41 is sandwiched between the flange 11 of the sleeve 10 and the inner ring of the rolling bearing 20 from both sides in the axial direction. And fixed support. The other dust cover 40b has the inner peripheral portion of the bent portion 41 abutted against the outer end surface of the sleeve 10, and the inner peripheral portion of the bent portion 41 is axially formed by the end surface of the sleeve 10 and the head 3a of the bolt 3. It is sandwiched from both sides and is used as a fixed support.

一対のダストカバー４０ａ、４０ｂの外周部は内方に向けて折り曲げにより傾斜部４２が設けられ、その傾斜部４２の外周部がアイドラプーリ３０におけるリム３１の内径面と対向し、その対向部間に微小間隙４３が設けられている。   The outer peripheral portions of the pair of dust covers 40a and 40b are bent inward to be provided with an inclined portion 42. The outer peripheral portion of the inclined portion 42 is opposed to the inner diameter surface of the rim 31 of the idler pulley 30, and between the opposed portions. A minute gap 43 is provided on the surface.

また、傾斜部４２の形成によって一対のダストカバー４０ａ、４０ｂの対向する内側面の外周部に断面形状を直線とするテーパ面４４が設けられている。   Further, a tapered surface 44 having a straight cross-sectional shape is provided on the outer peripheral portion of the inner surface facing the pair of dust covers 40a, 40b by forming the inclined portion 42.

上記の構成からなるアイドラプーリの支持装置においては、スリーブ１０によって内径部が支持される一対のダストカバー４０ａ、４０ｂによって転がり軸受２０の両側を覆うことができるため、飛来してくる異物の衝突によって転がり軸受２０が損傷するのを防止することができる。   In the idler pulley support device having the above-described configuration, both sides of the rolling bearing 20 can be covered by the pair of dust covers 40a and 40b whose inner diameter portions are supported by the sleeve 10, and therefore, by collision of incoming foreign matter. It is possible to prevent the rolling bearing 20 from being damaged.

また、ダストカバー４０ａ、４０ｂの外周部とリム３１の対向面間に微小間隙４３が設けられているため、上記微小間隙４３から一対のダストカバー４０ａ、４０ｂと転がり軸受２０の対向部間に水等の異物が侵入することが少ない。仮に侵入したとしても、その侵入異物はアイドラプーリ３０の回転による遠心力により径方向外方に向けて移動し、ダストカバー４０ａ、４０ｂの内面外周部に形成されたテーパ面４４により誘導されて環状空間３４内に流入し、微小間隙４３から外部に排出されることになる。   In addition, since the minute gap 43 is provided between the outer peripheral portions of the dust covers 40 a and 40 b and the facing surface of the rim 31, water flows between the minute gap 43 and the facing portions of the pair of dust covers 40 a and 40 b and the rolling bearing 20. Such as foreign substances such as Even if intruding, the invading foreign substance moves radially outward by the centrifugal force generated by the rotation of the idler pulley 30, and is guided by the tapered surface 44 formed on the inner periphery of the dust covers 40a and 40b to form an annular shape. It flows into the space 34 and is discharged to the outside through the minute gap 43.

上記のように、一対のダストカバー４０ａ、４０ｂの内側面の外周部にテーパ面４４を設けることによって侵入異物を滞留させることなく外部にスムーズに排出させることができ、水等の異物の侵入によって転がり軸受２０が損傷するのを防止することができる。   As described above, by providing the tapered surface 44 on the outer peripheral portion of the inner side surface of the pair of dust covers 40a, 40b, the intruding foreign matter can be smoothly discharged without stagnation, and the intrusion of foreign matter such as water It is possible to prevent the rolling bearing 20 from being damaged.

図２乃至図６は、この発明に係るアイドラプーリの支持装置の他の実施の形態を示す。図２に示す実施の形態においては、一対のダストカバー４０ａ、４０ｂを内径部に皿形の屈曲部４１を有する環状として、その外周部とアイドラプーリ３０におけるリム３１の内径面に微小間隙４３をおいて対向し、上記リム３１の内周両端部に、開口端を大径端とするテーパ面３７を設けている点で図１に示すアイドラプーリの支持装置と相違している。   2 to 6 show another embodiment of an idler pulley support device according to the present invention. In the embodiment shown in FIG. 2, the pair of dust covers 40 a and 40 b is formed into an annular shape having a dish-shaped bent portion 41 at the inner diameter portion, and a minute gap 43 is formed between the outer peripheral portion and the inner diameter surface of the rim 31 in the idler pulley 30. 1 is different from the idler pulley support device shown in FIG. 1 in that tapered surfaces 37 having an open end as a large-diameter end are provided at both inner peripheral ends of the rim 31.

このため、図１に示すアイドラプーリの支持装置と同一部分には同一の符号を付して説明を省略する。   For this reason, the same parts as those of the idler pulley support device shown in FIG.

図２に示すように、リム３１の内周両端部にテーパ面３７を設けることにより、アイドラプーリ３０の回転による遠心力によって径方向外方に移動する侵入異物はテーパ面３７により案内されて微小間隙４３から外部に排出されることになり、侵入異物を滞留させることなく外部にスムーズに排出させることができる。   As shown in FIG. 2, by providing tapered surfaces 37 at both inner peripheral ends of the rim 31, invading foreign substances that move radially outward by centrifugal force due to the rotation of the idler pulley 30 are guided by the tapered surfaces 37 and become minute. It will be discharged | emitted outside from the gap | interval 43, and it can be made to discharge | emit smoothly outside without stagnating intrusion foreign material.

図３に示す実施の形態においては、一対のダストカバー４０ａ、４０ｂの内側面の外周部にテーパ面４４を設け、アイドラプーリ３０におけるリム３１の内周両端部に開口端を大径端とするテーパ面３７を設けている。すなわち、図３では、一対のダストカバー４０ａ、４０ｂとして図１に示す一対のダストカバー４０ａ、４０ｂを採用し、アイドラプーリ３０として図２に示すアイドラプーリ３０を採用している。   In the embodiment shown in FIG. 3, tapered surfaces 44 are provided on the outer peripheral portions of the inner side surfaces of the pair of dust covers 40 a, 40 b, and the open ends are the large diameter ends at both inner peripheral end portions of the rim 31 in the idler pulley 30. A tapered surface 37 is provided. That is, in FIG. 3, the pair of dust covers 40a and 40b shown in FIG. 1 is adopted as the pair of dust covers 40a and 40b, and the idler pulley 30 shown in FIG.

上記のように、一対のダストカバー４０ａ、４０ｂの内側面の外周部にテーパ面４４を設け、アイドラプーリ３０におけるリム３１の内周両端部にテーパ面３７を設けることによって、侵入異物を外部によりスムーズに排出させることができる。   As described above, the tapered surfaces 44 are provided on the outer peripheral portions of the inner side surfaces of the pair of dust covers 40a and 40b, and the tapered surfaces 37 are provided on both inner peripheral end portions of the rim 31 of the idler pulley 30, thereby allowing intruding foreign matter to be introduced from the outside. It can be discharged smoothly.

図１に示す実施の形態においては、一対のダストカバー４０ａ、４０ｂの内側面外周部に設けられたテーパ面４４の断面形状を直線としているが、図４に示す実施の形態のように、上記テーパ面４４の断面形状を凹曲線としてもよい。   In the embodiment shown in FIG. 1, the cross-sectional shape of the tapered surface 44 provided on the inner peripheral surface of the pair of dust covers 40a and 40b is a straight line. However, as in the embodiment shown in FIG. The cross-sectional shape of the tapered surface 44 may be a concave curve.

また、図２に示す実施の形態においては、リム３１の内径面両端部に設けたテーパ面３７の断面形状を直線としているが、図５に示す実施の形態のように、上記テーパ面３７の断面形状を凹曲線としてもよい。   Further, in the embodiment shown in FIG. 2, the cross-sectional shape of the tapered surface 37 provided at both ends of the inner diameter surface of the rim 31 is a straight line. However, as in the embodiment shown in FIG. The cross-sectional shape may be a concave curve.

図６に示す実施の形態においては、一対のダストカバー４０ａ、４０ｂとして図４に示すダストカバー４０ａ、４０ｂを採用し、アイドラプーリ３０として図５に示すアイドラプーリ３０を採用している。   In the embodiment shown in FIG. 6, the dust covers 40 a and 40 b shown in FIG. 4 are adopted as the pair of dust covers 40 a and 40 b, and the idler pulley 30 shown in FIG. 5 is adopted as the idler pulley 30.

図４乃至図６で示すいずれの実施の形態においても、侵入異物を外部にスムーズに排出させることができる。   In any of the embodiments shown in FIGS. 4 to 6, the intruding foreign matter can be smoothly discharged to the outside.

１ エンジンブロック（静止部材）
１０ スリーブ
２０ 転がり軸受
３０ アイドラプーリ
３１ リム
３７ テーパ面
４０ａ ダストカバー
４０ｂ ダストカバー
４３ 微小間隙
４４ テーパ面 1 Engine block (stationary member)
DESCRIPTION OF SYMBOLS 10 Sleeve 20 Rolling bearing 30 Idler pulley 31 Rim 37 Tapered surface 40a Dust cover 40b Dust cover 43 Minute gap 44 Tapered surface

Claims (4)

静止部材（１）に固定されるスリーブ（１０）の外周に転がり軸受（２０）を介してアイドラプーリ（３０）を回転自在に支持し、前記スリーブ（１０）によって内径部が支持され、外周部が前記アイドラプーリ（３０）のリム（３１）内径面と微小間隙（４３）をおいて対向配置される一対の環状のダストカバー（４０ａ、４０ｂ）により前記転がり軸受（２０）の両側面を覆うようにしたアイドラプーリの支持装置において、
前記アイドラプーリ（３０）は、ベルトが巻き掛けられるリム（３１）と、前記リム（３１）の内径面中央部に設けられた環状板部（３２）と、前記環状板部（３２）の内径部に設けられた内筒部（３３）とを有し、
前記環状板部（３２）の軸方向両側に環状空間（３４）が設けられていて、
前記一対のダストカバー（４０ａ、４０ｂ）は、それぞれ外周部に軸方向の外側から内側に向かって大径となる傾斜部（４２）を有し、前記傾斜部（４２）の内側面及び外側面にテーパ面（４４）が設けられ、
前記傾斜部（４２）の大径側端部が、前記環状空間（３４）の軸方向中央位置よりも外側で前記リム（３１）の内径面と前記微小間隙（４３）をおいて対向し、その微小間隙（４３）よりも大きい隙間をおいて前記内筒部（３３）の外径面と対向していることを特徴とするアイドラプーリの支持装置。 An idler pulley (30) is rotatably supported on the outer periphery of a sleeve (10) fixed to the stationary member (1) via a rolling bearing (20), and an inner diameter portion is supported by the sleeve (10). Covers both side surfaces of the rolling bearing (20) with a pair of annular dust covers (40a, 40b) disposed opposite to the inner surface of the rim (31) of the idler pulley (30) with a minute gap (43). In the idler pulley support device,
The idler pulley (30) includes a rim (31) around which a belt is wound, an annular plate portion (32) provided at a central portion of an inner diameter surface of the rim (31), and an inner diameter of the annular plate portion (32). An inner cylinder part (33) provided in the part,
An annular space (34) is provided on both axial sides of the annular plate portion (32),
Each of the pair of dust covers (40a, 40b) has an inclined portion (42) having a large diameter from the outer side in the axial direction toward the inner side at the outer peripheral portion, and the inner side surface and the outer side surface of the inclined portion (42). tapered surface (44) is provided,
The large-diameter side end of the inclined portion (42) is opposed to the inner diameter surface of the rim (31) outside the center position in the axial direction of the annular space (34) with the minute gap (43), The idler pulley support device is characterized in that it is opposed to the outer diameter surface of the inner cylinder part (33) with a gap larger than the minute gap (43) . 前記アイドラプーリ（３０）におけるリム（３１）の内径面両端部に開口端を大径端とするテーパ面（３７）を設けた請求項１に記載のアイドラプーリの支持装置。   The support device for an idler pulley according to claim 1, wherein a tapered surface (37) having an open end as a large-diameter end is provided at both ends of the inner surface of the rim (31) of the idler pulley (30). 静止部材（１）に固定されるスリーブ（１０）の外周に転がり軸受（２０）を介してアイドラプーリ（３０）を回転自在に支持し、前記スリーブ（１０）によって内径部が支持され、外周部が前記アイドラプーリ（３０）のリム（３１）内径面と微小間隙（４３）をおいて対向配置される一対の環状のダストカバー（４０ａ、４０ｂ）により前記転がり軸受（２０）の両側面を覆うようにしたアイドラプーリの支持装置において、
前記アイドラプーリ（３０）は、ベルトが巻き掛けられるリム（３１）と、前記リム（３１）の内径面中央部に設けられた環状板部（３２）と、前記環状板部（３２）の内径部に設けられた内筒部（３３）とを有し、
前記環状板部（３２）の軸方向両側に環状空間（３４）が設けられていて、
前記リム（３１）の内径面両端部に開口端を大径端とするテーパ面（３７）を設け、
前記一対のダストカバー（４０ａ、４０ｂ）は、それぞれ外周部を前記環状空間（３４）の軸方向中央位置よりも外側で前記リム（３１）のテーパ面（３７）と対向させたことを特徴とするアイドラプーリの支持装置。 An idler pulley (30) is rotatably supported on the outer periphery of a sleeve (10) fixed to the stationary member (1) via a rolling bearing (20), and an inner diameter portion is supported by the sleeve (10). Covers both side surfaces of the rolling bearing (20) with a pair of annular dust covers (40a, 40b) disposed opposite to the inner surface of the rim (31) of the idler pulley (30) with a minute gap (43). In the idler pulley support device,
The idler pulley (30) includes a rim (31) around which a belt is wound, an annular plate portion (32) provided at a central portion of an inner diameter surface of the rim (31), and an inner diameter of the annular plate portion (32). An inner cylinder part (33) provided in the part,
An annular space (34) is provided on both axial sides of the annular plate portion (32),
Before tapered surface of the open end and large-diameter end (37) provided on the inner surface at both ends of the cut arm (31),
Each of the pair of dust covers (40a, 40b) has an outer peripheral portion opposed to the tapered surface (37) of the rim (31) outside the center position in the axial direction of the annular space (34). The idler pulley support device. 前記テーパ面（４４、３７）が、断面形状で直線または凹曲線とされた請求項１乃至３のいずれか１項に記載のアイドラプーリの支持装置。   The idler pulley support device according to any one of claims 1 to 3, wherein the tapered surfaces (44, 37) are straight or concave in cross-sectional shape.
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