JP2015194175A - pulley unit - Google Patents

pulley unit Download PDF

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Publication number
JP2015194175A
JP2015194175A JP2014071574A JP2014071574A JP2015194175A JP 2015194175 A JP2015194175 A JP 2015194175A JP 2014071574 A JP2014071574 A JP 2014071574A JP 2014071574 A JP2014071574 A JP 2014071574A JP 2015194175 A JP2015194175 A JP 2015194175A
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Prior art keywords
bearing
pulley
seal member
diameter surface
outer ring
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JP2014071574A
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Japanese (ja)
Inventor
渡辺　一弘
Kazuhiro Watanabe
一弘 渡辺
中尾　吾朗
Goro Nakao
吾朗 中尾
井筒　智善
Tomoyoshi Izutsu
智善 井筒
毅 香田
Tsuyoshi Koda
毅 香田
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2014071574A priority Critical patent/JP2015194175A/en
Publication of JP2015194175A publication Critical patent/JP2015194175A/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
    • 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
    • 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)
  • Mounting Of Bearings Or Others (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a pulley unit which can prevent the intrusion of high-pressure washing water into a bearing without the necessity for high-accuracy processing to a bearing inner ring.SOLUTION: A bearing 20 is assembled into a boss part 13 of a pulley 10, and both-end openings of a bearing space 24 of the bearing 20 are sealed with a seal member 30. The seal member 30 is formed of a slinger 31 of an L-shape in a cross section which has an outward flange 33 at an inside end part of a cylinder part 32 which is pressure-inserted into an outside diameter face end part of an inner ring 22, and an elastic seal member 35 which is supported to both end parts of an inside diameter face of an outer ring 21 at an external peripheral part and reinforced by a core grid 36. Tip parts of a pair of seal lips 37a, 37b are made to elastically contact with an internal periphery of the elastic seal member 35, and the intrusion of high-pressure washing water into the bearing 20 is prevented.

Description

この発明は、ベルト伝動装置のベルトの移動を案内する自動車エンジン用のプーリユニットに関する。   The present invention relates to a pulley unit for an automobile engine that guides movement of a belt of a belt transmission device.

オルタネータやコンプレッサ等の自動車補機を駆動するベルト伝動装置においては、アイドラプーリによってベルトの移動を案内し、あるいは、油圧式オートテンショナによりテンションプーリをベルトに押し付けてベルトの張力変動を吸収するようにしている。   In belt transmissions that drive automotive accessories such as alternators and compressors, the belt movement is guided by idler pulleys, or the tension pulley is pressed against the belt by a hydraulic auto tensioner to absorb belt tension fluctuations. ing.

上記のようなアイドラプーリやテンションプーリは、一般的に、ボス部の内径側に組み込まれてユニット化された転がり軸受により回転自在に支持される。転がり軸受を有するプーリユニットのベルト伝動装置への組み込み状態において、転がり軸受が外部に露出していると、飛来してくる泥水等の異物が軸受内部に入り込み易く、その異物の侵入により転がり軸受を早期に損傷させることになる。   The idler pulley and the tension pulley as described above are generally supported rotatably by a rolling bearing incorporated into the boss portion and unitized. When a pulley unit having a rolling bearing is incorporated into a belt transmission device, if the rolling bearing is exposed to the outside, foreign matter such as incoming muddy water is likely to enter the bearing, and the rolling bearing becomes It will be damaged early.

そのため、上記プーリユニットにおいては、転がり軸受として、シール付き転がり軸受が一般的に採用される。しかし、軸受シールは、一般に、その内周部に設けられたリップを内輪外径面に弾性接触させる接触形であって、その締め代により外部からの水の浸入を防止する構成であり、上記締め代を大きくすると回転トルクが増加するため、締め代を大きくすることができず、水の浸入を完全に防止することはできない。   Therefore, in the pulley unit, a rolling bearing with a seal is generally adopted as the rolling bearing. However, the bearing seal is generally a contact type in which a lip provided on the inner periphery of the bearing seal is in elastic contact with the outer surface of the inner ring, and is configured to prevent water from entering from the outside due to the tightening margin. When the tightening margin is increased, the rotational torque increases, so that the tightening margin cannot be increased and water intrusion cannot be completely prevented.

ここで、特許文献１に記載されたプーリ用軸受装置のように、プーリ本体を回転自在に支持する軸受の両側にスリンガを設けることにより、耐水性の向上を図ることができるが、上記スリンガの外周部が軸受の外輪と接触していると、プーリ本体と共に回転する外輪の回転抵抗となるため、スリンガの外周部は外輪の側面に対して間隔を設けて非接触とする必要がある。   Here, as in the pulley bearing device described in Patent Document 1, it is possible to improve water resistance by providing slinger on both sides of the bearing that rotatably supports the pulley body. When the outer peripheral portion is in contact with the outer ring of the bearing, it becomes rotational resistance of the outer ring that rotates together with the pulley body. Therefore, the outer peripheral portion of the slinger needs to be spaced apart from the side surface of the outer ring.

このため、エンジンルームが高圧洗浄水によって洗浄される際、高圧洗浄水がスリンガと外輪の対向面間に形成された隙間から、そのスリンガと軸受シールの対向部間に浸入する可能性がある。このとき、内輪にリップを接触させる接触形軸受シールでは、上記のように、リップの締め代が小さいため、軸受内部への水の浸入を完全に防止することはできない。   For this reason, when the engine room is washed with high-pressure washing water, the high-pressure washing water may enter between the slinger and the opposed portion of the bearing seal through the gap formed between the opposed surfaces of the slinger and the outer ring. At this time, in the contact-type bearing seal in which the lip is brought into contact with the inner ring, as described above, the allowance of the lip is small, so that it is not possible to completely prevent water from entering the bearing.

そこで、特許文献２に記載されているように、内輪にスリンガを圧入し、外輪に外周部が支持された摺動シール部の上記スリンガと対向するアキシャル基面に副シールリップを設け、その副シールリップの先端部をスリンガに弾性接触させることにより、摺動シール部の損傷防止と、高圧洗浄水の浸入防止に大きな効果を挙げることができる。   Therefore, as described in Patent Document 2, a slinger is press-fitted into the inner ring, and a secondary seal lip is provided on the axial base surface facing the slinger of the sliding seal part whose outer peripheral part is supported by the outer ring. By bringing the tip of the seal lip into elastic contact with the slinger, a great effect can be obtained in preventing damage to the sliding seal and preventing intrusion of high-pressure cleaning water.

特開２００５−３３７３８３号公報JP 2005-337383 A 特開２００９−２１６１３８号公報JP 2009-216138 A

ところで、上記特許文献２に記載されたスリンガ付きの軸受用密封装置においては、副シールリップのみでは耐水性が充分ではないため、摺動シール部の内周縁部に主シールリップを設け、その主シールリップを内輪の端部に形成された段差部のアキシャル方向端部に弾性接触させて上記副シールリップとで２重のシール構造として耐水性の向上を図るようにしている。このとき、内輪には段差部を形成する必要があり、しかも、その段差部の主シールリップが弾性接触するアキシャル方向端部を高精度に加工する必要が生じ、内輪の加工に手間がかかるという不都合がある。   By the way, in the sealing device for a bearing with a slinger described in Patent Document 2, since the water resistance is not sufficient only by the sub seal lip, a main seal lip is provided at the inner peripheral edge of the sliding seal portion. The seal lip is elastically brought into contact with the end portion in the axial direction of the step portion formed at the end portion of the inner ring so as to improve the water resistance with a double seal structure with the sub seal lip. At this time, it is necessary to form a stepped portion on the inner ring, and it is necessary to process the axial end portion with which the main seal lip of the stepped portion is in elastic contact with high accuracy, which takes time and labor to process the inner ring. There is an inconvenience.

この発明の課題は、軸受内輪に精度の高い加工を施すことなく軸受内部への高圧洗浄水の浸入防止を図ることができるようにしたプーリユニットを提供することである。   An object of the present invention is to provide a pulley unit that can prevent high-pressure cleaning water from entering the bearing without subjecting the bearing inner ring to high-precision processing.

上記の課題を解決するため、この発明においては、ベルト案内輪の内側にボス部が設けられたプーリと、前記ボス部の内側に組み込まれた外輪回転用の軸受とを有し、前記軸受の外輪と内輪間に形成された軸受空間の両端開口のそれぞれをシール部材によりシールしたプーリユニットにおいて、前記シール部材が、前記内輪の外径面端部に圧入される円筒部を具え、その円筒部の圧入時における先行側の端部に外向きフランジが設けられ、その外向きフランジの外径面が前記外輪の内径面との間でラビリンス隙間を形成する外径とされた断面Ｌ形のスリンガと、前記外輪の内径面における両端部に外周部が支持され、芯金によって補強された弾性シール部材とを有し、前記弾性シール部材の内周部に、内径端が弾性シール部材の外側面より外方に位置する内向き傾斜の複数のシールリップを設け、その複数のシールリップのそれぞれ先端部を前記スリンガの円筒部に弾性接触させた構成を採用したのである。   In order to solve the above-described problems, the present invention includes a pulley having a boss portion provided inside a belt guide wheel, and a bearing for rotating an outer ring incorporated inside the boss portion. In a pulley unit in which both end openings of a bearing space formed between an outer ring and an inner ring are sealed with a sealing member, the sealing member includes a cylindrical portion that is press-fitted into an outer diameter surface end portion of the inner ring, and the cylindrical portion L-shaped slinger with an outward flange provided at the leading end at the time of press-fitting, and an outer diameter surface of the outward flange having an outer diameter that forms a labyrinth clearance with the inner diameter surface of the outer ring And an elastic seal member supported at both ends on the inner diameter surface of the outer ring and reinforced by a cored bar, the inner diameter end of the elastic seal member having an inner diameter end on the outer surface of the elastic seal member Outside A plurality of sealing lips inwardly inclined located provided, we were adopted a configuration in which the respective tip portions are elastically in contact with the cylindrical portion of the slinger of the plurality of sealing lips.

上記のように、弾性シール部材の内周部に複数のシールリップを設けてスリンガの円筒部に弾性接触し、かつ、スリンガの外向きフランジの外径面と外輪の内径面間にラビリンス隙間を設けることにより、上記複数のシールリップとラビリンス隙間の双方において水の浸入を防止することができる。   As described above, a plurality of seal lips are provided on the inner peripheral portion of the elastic seal member to make elastic contact with the cylindrical portion of the slinger, and a labyrinth gap is formed between the outer diameter surface of the outward flange of the slinger and the inner diameter surface of the outer ring. By providing, water intrusion can be prevented in both the plurality of seal lips and the labyrinth gap.

また、エンジンルームを洗浄する高圧洗浄水が弾性シール部材に吹き付けられると、複数のシールリップのそれぞれがスリンガの円筒部に強く接触することになるため、高圧洗浄水の軸受内部への浸入を確実に防止することができる。   In addition, when high-pressure cleaning water that cleans the engine room is sprayed onto the elastic seal member, each of the seal lips comes into strong contact with the cylindrical portion of the slinger. Can be prevented.

ここで、内輪にシールリップを接触させてシール性を確保する場合、内輪のリップ接触面を高精度に仕上げる必要があるが、シールリップのそれぞれはスリンガに円筒部に弾性接触してスリンガとの対向部間をシールするため、内輪にシール性を保持するための精度の高い加工を必要とせず、内輪の加工の容易化を図ることができる。   Here, in order to ensure sealing performance by bringing the seal lip into contact with the inner ring, it is necessary to finish the lip contact surface of the inner ring with high precision.Each of the seal lips is in elastic contact with the cylindrical portion of the slinger and is connected to the slinger. Since the gap between the opposed portions is sealed, the inner ring does not require high-precision processing for maintaining the sealing performance, and the inner ring can be easily processed.

また、弾性シール部材は、シールリップがスリンガの円筒部に対して弾性接触する状態で回転するため、柔軟性および耐摩耗性に優れたゴムで形成するのが好ましい。そのようなゴムとして、ニトリルゴム、アクリルゴム、フッ素ゴムを挙げることができる。これらのゴムは、加硫接着によって芯金に一体化するのが好ましい。   The elastic seal member is preferably formed of rubber having excellent flexibility and wear resistance because the seal lip rotates in a state of elastic contact with the cylindrical portion of the slinger. Examples of such rubber include nitrile rubber, acrylic rubber, and fluoro rubber. These rubbers are preferably integrated into the cored bar by vulcanization adhesion.

この発明に係るプーリユニットにおいて、プーリを軸受の外輪外径面上において成形された樹脂成形品とすることにより、プーリの成形と同時に軸受を一体化することができるため、プーリユニットの組立て作業を不要とし、取扱いの容易なプーリユニットを得ることができる。   In the pulley unit according to the present invention, since the pulley is a resin molded product molded on the outer diameter surface of the outer ring of the bearing, the bearing can be integrated simultaneously with the molding of the pulley. A pulley unit that is unnecessary and easy to handle can be obtained.

この場合、外輪の外径面にローレット加工を施し、あるいは、外輪外径面に周溝や凹部を設けて軸受と樹脂の成形品からなるプーリの結合力を高めるのが好ましい。   In this case, it is preferable that the outer ring outer diameter surface is knurled, or the outer ring outer diameter surface is provided with a circumferential groove or a recess to increase the coupling force between the bearing and the resin molded product.

また、軸受の外側に、その軸受の側面およびボス部の端部外周を覆う一対のダストカバーを設けると、そのダストカバーで弾性シール部材を保護することができるため、弾性シール部材が異物との接触により損傷するのを防止することができると共に、高圧洗浄水の浸入をより効果的に防止することができる。   In addition, when a pair of dust covers that cover the side surfaces of the bearing and the outer periphery of the end of the boss portion are provided outside the bearing, the elastic seal member can be protected by the dust cover. In addition to preventing damage due to contact, it is possible to more effectively prevent high-pressure cleaning water from entering.

さらに、軸受の内輪内径面に、フランジを一端部に有する筒状のプーリ軸を圧入して軸受とプーリ軸とを一体化すると、プーリ軸内に挿入するボルトをプーリ取付け対象にねじ込むことによってプーリユニットの組み付けとすることができるため、組み付けの容易なプーリユニットを得ることができる。   Furthermore, when a cylindrical pulley shaft having a flange at one end is press-fitted into the inner ring inner surface of the bearing to integrate the bearing and the pulley shaft, a bolt to be inserted into the pulley shaft is screwed into the pulley mounting object to thereby remove the pulley. Since the unit can be assembled, a pulley unit that can be easily assembled can be obtained.

この発明においては、上記のように、弾性シール部材の内周部に複数のシールリップを設けてスリンガの円筒部に弾性接触し、かつ、スリンガの外向きフランジの外径面と外輪の内径面間にラビリンス隙間を設けたことにより、上記複数のシールリップとラビリンス隙間の双方で水の浸入を防止することができ、耐水性に優れたプーリユニットを得ることができる。   In the present invention, as described above, a plurality of seal lips are provided on the inner peripheral portion of the elastic seal member to make elastic contact with the cylindrical portion of the slinger, and the outer diameter surface of the outward flange of the slinger and the inner diameter surface of the outer ring By providing the labyrinth gap between them, the intrusion of water can be prevented by both the plurality of seal lips and the labyrinth gap, and a pulley unit having excellent water resistance can be obtained.

また、複数のシールリップはスリンガの円筒部に弾性接触してその対向部間をシールするため、軸受内輪に特別な加工を施すことなく耐水性の向上を図ることができる。   Further, since the plurality of seal lips are in elastic contact with the cylindrical portion of the slinger and seal between the opposing portions, it is possible to improve water resistance without performing special processing on the bearing inner ring.

この発明に係るプーリユニットの実施の形態を示す縦断面図The longitudinal cross-sectional view which shows embodiment of the pulley unit based on this invention 図１のシール部材の取り付け部を拡大して示す断面図Sectional drawing which expands and shows the attachment part of the sealing member of FIG. （ａ）乃至（ｃ）はプーリと軸受の結合力を高める手段の各例を示す断面図(A) thru | or (c) is sectional drawing which shows each example of a means to raise the coupling force of a pulley and a bearing

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に示すように、プーリユニットは、プーリ１０と、そのプーリ１０を回転自在に支持する軸受２０と、その軸受２０を支持するプーリ軸４０と、軸受２０の両側方に設けられた一対のダストカバー５０ａ、５０ｂを有している。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. As illustrated in FIG. 1, the pulley unit includes a pulley 10, a bearing 20 that rotatably supports the pulley 10, a pulley shaft 40 that supports the bearing 20, and a pair of bearings 20 provided on both sides of the bearing 20. Dust covers 50a and 50b are provided.

プーリ１０は、外径部にベルト案内輪１１を有し、そのベルト案内輪１１の内径面に環状フランジ１２が形成され、その環状フランジ１２の内径部にボス部１３が設けられた樹脂の成形品からなり、上記ボス部１３の一方の端部には内向きフランジ１４が設けられている。   The pulley 10 has a belt guide wheel 11 at an outer diameter portion, an annular flange 12 is formed on the inner diameter surface of the belt guide wheel 11, and a resin molding in which a boss portion 13 is provided on the inner diameter portion of the annular flange 12. An inward flange 14 is provided at one end of the boss 13.

ベルト案内輪１１として、ここでは、外径面が円筒面１５からなる平ベルト案内用のものを示したが、外径面に複数のＶ溝が形成されたＶベルト案内用のものであってもよい。   Here, the belt guide wheel 11 is for a flat belt guide whose outer diameter surface is a cylindrical surface 15, but is for a V belt guide having a plurality of V grooves formed on the outer diameter surface. Also good.

軸受２０は、外輪２１、内輪２２、その両輪２１、２２間に組み込まれた複列の転動体としてのボール２３を有する玉軸受からなり、各列のボール２３の外側にシール部材３０が組み込まれ、そのシール部材３０によって外輪２１と内輪２２の対向面間に形成された軸受空間２４の両端開口がシールされている。   The bearing 20 comprises a ball bearing having an outer ring 21, an inner ring 22, and balls 23 as double row rolling elements incorporated between the two rings 21, 22, and seal members 30 are incorporated outside the balls 23 in each row. The both end openings of the bearing space 24 formed between the opposed surfaces of the outer ring 21 and the inner ring 22 are sealed by the seal member 30.

なお、玉軸受として複列玉軸受の場合を示したが、支障のない範囲で、単列の玉軸受や、単列の玉軸受を複数個、例えば、２列で使用する形態としてもよい。   In addition, although the case of the double row ball bearing was shown as a ball bearing, it is good also as a form which uses a single row ball bearing and a single row ball bearing in multiple, for example, 2 rows, in the range which does not have trouble.

図２に示すように、シール部材３０は、内輪２２の外径面端部に装着されたスリンガ３１と、そのスリンガ３１の外側に設けられた弾性シール部材３５とからなる。   As shown in FIG. 2, the seal member 30 includes a slinger 31 attached to the outer diameter surface end portion of the inner ring 22 and an elastic seal member 35 provided outside the slinger 31.

スリンガ３１は、円筒部３２の一方の端部に外向きフランジ３３を設けた鋼板のプレス成形品からなり、上記円筒部３２が内輪２２の外径面端部に圧入する取り付けとされている。このとき、円筒部３２は、外向きフランジ３３を前側として内輪２２の端部に圧入される。また、円筒部３２は、その外径面が外輪２１の内径面との間にラビリンス隙間３４を形成する外径寸法とされている。   The slinger 31 is made of a press-formed product of a steel plate provided with an outward flange 33 at one end portion of the cylindrical portion 32, and the cylindrical portion 32 is attached so as to be press-fitted into the outer diameter surface end portion of the inner ring 22. At this time, the cylindrical portion 32 is press-fitted into the end portion of the inner ring 22 with the outward flange 33 as the front side. The cylindrical portion 32 has an outer diameter that forms a labyrinth gap 34 between the outer diameter surface and the inner diameter surface of the outer ring 21.

弾性シール部材３５は、環状をなし、芯金３６によって補強されている。弾性シール部材３５の外周部には芯金３６の外周に形成された円筒部３６ａを覆うようにして嵌合部３５ａが設けられ、その嵌合部３５ａが外輪２１の内径面端部に形成されたシール取付溝２５に圧入されて外周部が外輪２１で支持されている。   The elastic seal member 35 has an annular shape and is reinforced by a cored bar 36. A fitting portion 35 a is provided on the outer peripheral portion of the elastic seal member 35 so as to cover a cylindrical portion 36 a formed on the outer periphery of the metal core 36, and the fitting portion 35 a is formed at the inner diameter surface end portion of the outer ring 21. The outer peripheral portion is supported by the outer ring 21 by being press-fitted into the seal mounting groove 25.

また、弾性シール部材３５の内周部には内向き傾斜部３５ｂが設けられ、その傾斜部３５ｂの内周に、内径端が弾性シール部材３５の外側面より外方に位置する内向き傾斜の複数のシールリップ３７ａ、３７ｂが設けられ、それぞれのシールリップ３７ａ、３７ｂの先端部がスリンガ３１の円筒部３２の外径面に弾性接触して円筒部３２と傾斜部３５ｂ間をシールしている。   Further, an inwardly inclined portion 35 b is provided on the inner peripheral portion of the elastic seal member 35, and the inner peripheral end of the inclined portion 35 b has an inwardly inclined shape in which the inner diameter end is located outward from the outer surface of the elastic seal member 35. A plurality of seal lips 37a and 37b are provided, and the tip portions of the seal lips 37a and 37b are in elastic contact with the outer diameter surface of the cylindrical portion 32 of the slinger 31 to seal between the cylindrical portion 32 and the inclined portion 35b. .

弾性シール部材３５は外輪２１と一体に回転する。その回転時、シールリップ３７ａ、３７ｂの先端部は円筒部３２の外径面を摺動し、その摺動面の面粗さが粗いと、早期に接触摩耗する可能性がある。   The elastic seal member 35 rotates integrally with the outer ring 21. At the time of the rotation, the tip end portions of the seal lips 37a and 37b slide on the outer diameter surface of the cylindrical portion 32. If the surface roughness of the sliding surface is rough, contact wear may occur at an early stage.

そのような不都合の発生を防止するため、スリンガ３１における円筒部３２の外径面および外向きフランジ３３の軸受空間２４と対向する内側面の面粗さは他の残りの面粗さより細かくされて平滑面とされている。   In order to prevent the occurrence of such inconvenience, the outer surface of the cylindrical portion 32 of the slinger 31 and the surface roughness of the inner surface of the outward flange 33 facing the bearing space 24 are made finer than the remaining surface roughness. It is a smooth surface.

また、シールリップ３７ａ、３７ｂのそれぞれは、円筒部３２の外径面に弾性接触して対向部間をシールするため、柔軟性および耐摩耗性に優れたゴムで形成するのが好ましい。そのようなゴムとして、ニトリルゴム、アクリルゴム、フッ素ゴムを挙げることができる。   In addition, each of the seal lips 37a and 37b is preferably made of rubber having excellent flexibility and wear resistance because the seal lips 37a and 37b are elastically brought into contact with the outer diameter surface of the cylindrical portion 32 to seal between the opposing portions. Examples of such rubber include nitrile rubber, acrylic rubber, and fluoro rubber.

図１に示すように、軸受２０はプーリ１０におけるボス部１３の内径面に圧入され、そのボス部１３の一端部に設けられた上述の内向きフランジ１４によって軸方向に位置決めされる。   As shown in FIG. 1, the bearing 20 is press-fitted into the inner diameter surface of the boss portion 13 in the pulley 10, and is positioned in the axial direction by the inward flange 14 provided at one end portion of the boss portion 13.

プーリ軸４０は、筒状をなし、その一方の端部にはフランジ４１が設けられている。プーリ軸４０は軸受２０における内輪２２の内径面に圧入されて軸受２０と一体化され、その内側に挿通されてエンジンブロック等のプーリ取付け対象Ａにねじ込まれるボルト４２の締め付けにより固定される。   The pulley shaft 40 has a cylindrical shape, and a flange 41 is provided at one end thereof. The pulley shaft 40 is press-fitted into the inner diameter surface of the inner ring 22 of the bearing 20 and integrated with the bearing 20, and is fixed by tightening a bolt 42 that is inserted into the pulley 20 and screwed into a pulley attachment target A such as an engine block.

図１に示すように、一対のダストカバー５０ａ、５０ｂのそれぞれは、環状をなし、その外周部にはテーパ状周壁５１が設けられている。また、内周部には上記周壁５１と同方向に膨出する膨出部５２が設けられている。   As shown in FIG. 1, each of the pair of dust covers 50 a and 50 b has an annular shape, and a tapered peripheral wall 51 is provided on the outer peripheral portion thereof. Further, a bulging portion 52 that bulges in the same direction as the peripheral wall 51 is provided on the inner peripheral portion.

一対のダストカバー５０ａの一方のダストカバー５０ａは、プーリ軸４０のフランジ４１と軸受２０の内輪２２とで膨出部５２の内周部が両側から挟持される取り付けとされて軸受２０の一側面およびボス部１３の一端部外周を覆っている。   One dust cover 50 a of the pair of dust covers 50 a is attached so that the inner peripheral portion of the bulging portion 52 is sandwiched from both sides by the flange 41 of the pulley shaft 40 and the inner ring 22 of the bearing 20. And the outer periphery of the one end part of the boss | hub part 13 is covered.

また、他方のダストカバー５０ｂは、ボルト４２に設けられた座４２ａとプーリ軸４０の端部とで膨出部５２の内周部が両側から挟持される取り付けとされて軸受２０の一側面およびボス部１３の一端部外周を覆っている。   The other dust cover 50b is mounted such that the inner peripheral portion of the bulging portion 52 is sandwiched from both sides by a seat 42a provided on the bolt 42 and the end of the pulley shaft 40, and one side surface of the bearing 20 and The outer periphery of the one end part of the boss | hub part 13 is covered.

図１および図２に示すように、弾性シール部材３５の内周部に複数のシールリップ３７ａ、３７ｂを設けてスリンガ３１の円筒部３６ａに弾性接触し、かつ、スリンガ３１の外向きフランジ３３の外径面と外輪２１の内径面間にラビリンス隙間３４を設けることにより、上記複数のシールリップ３７ａ、３７ｂとラビリンス隙間３４の双方において水の浸入を防止することができる。   As shown in FIGS. 1 and 2, a plurality of seal lips 37 a and 37 b are provided on the inner peripheral portion of the elastic seal member 35 to elastically contact the cylindrical portion 36 a of the slinger 31, and the outward flange 33 of the slinger 31 By providing the labyrinth gap 34 between the outer diameter surface and the inner diameter surface of the outer ring 21, it is possible to prevent water from entering in both the plurality of seal lips 37 a and 37 b and the labyrinth gap 34.

このため、ダストカバー５０ａ、５０ｂを省略した場合においても、優れた耐水性を有し、エンジンルームが高圧洗浄水によって洗浄され、その洗浄水が吹き付けられると、シールリップ３７ａ、３７ｂのそれぞれが円筒部３２の外径面にさらに強く接触することになるため、高圧洗浄水の軸受２０内部への浸入を確実に防止することができる。   For this reason, even when the dust covers 50a and 50b are omitted, the seal lips 37a and 37b are cylindrical when the engine room is washed with high-pressure washing water and sprayed with the washing water. Since the outer surface of the portion 32 comes into contact more strongly, the high pressure washing water can be reliably prevented from entering the bearing 20.

ここで、内輪２２にシールリップを接触させてシール性を確保する場合、内輪２２のリップ接触面を高精度に仕上げる必要があるが、シールリップ３７ａ、３７ｂのそれぞれはスリンガ３１に円筒部３２に弾性接触してスリンガ３１との対向部間をシールするため、内輪２２に精度の高い加工を必要とせず、内輪２２の加工の容易化を図ることができる。   Here, when the sealing lip is secured by contacting the inner ring 22 with the seal lip, it is necessary to finish the lip contact surface of the inner ring 22 with high accuracy. However, each of the seal lips 37a and 37b is formed on the slinger 31 and the cylindrical portion 32. Since the elastic contact is made and the space between the opposing portions to the slinger 31 is sealed, the inner ring 22 is not required to be processed with high accuracy, and the processing of the inner ring 22 can be facilitated.

図１に示すように、軸受２０の外側に、その軸受２０の側面およびボス部１３の端部外周を覆う一対のダストカバー５０ａ、５０ｂを設けると、そのダストカバー５０で弾性シール部材３５を保護することができる。   As shown in FIG. 1, when a pair of dust covers 50 a and 50 b covering the side surface of the bearing 20 and the outer periphery of the end of the boss portion 13 are provided outside the bearing 20, the elastic seal member 35 is protected by the dust cover 50. can do.

このため、飛来してくる異物が弾性シール部材３５に直接衝突するということはなく、異物の衝突によって弾性シール部材３５が損傷するのを防止することができると共に、高圧洗浄水が弾性シート部材３５に直接衝突することはないため、高圧洗浄水の浸入をより確実に防止することができる。   For this reason, the incoming foreign matter does not directly collide with the elastic seal member 35, and it is possible to prevent the elastic seal member 35 from being damaged by the collision of the foreign matter, and the high-pressure cleaning water is supplied to the elastic sheet member 35. Therefore, it is possible to prevent the high-pressure cleaning water from entering more reliably.

図１では、プーリ１０のボス部１３内に軸受２０を圧入したが、軸受２０における外輪２１の外径面上にプーリ１０を樹脂成形してもよい。このとき、プーリ１０と軸受２０は一体化されるため、プーリユニットの組立て作業を不要とすることができ、取扱いの容易なプーリユニットを得ることができる。   In FIG. 1, the bearing 20 is press-fitted into the boss portion 13 of the pulley 10. However, the pulley 10 may be resin-molded on the outer diameter surface of the outer ring 21 in the bearing 20. At this time, since the pulley 10 and the bearing 20 are integrated, an assembly operation of the pulley unit can be omitted, and an easily handled pulley unit can be obtained.

この場合、軸受２０と樹脂の成形品からなるプーリ１０の結合力を高めるため、図３（ａ）においては、外輪２１の外径面にローレット加工を施してローレット目４３を設けている。また、図３（ｂ）においては、外輪２１の外径面に周溝４４を設け、さらに、図３（ｃ）においては、外輪２１の外径面に盲孔からなる凹部４５を設けている。   In this case, in order to increase the coupling force between the bearing 20 and the pulley 10 made of a resin molded product, in FIG. 3A, the outer diameter surface of the outer ring 21 is knurled to provide knurled eyes 43. 3 (b), a circumferential groove 44 is provided on the outer diameter surface of the outer ring 21, and in FIG. 3 (c), a recess 45 made of a blind hole is provided on the outer diameter surface of the outer ring 21. .

１０ プーリ
１１ ベルト案内輪
１３ ボス部
２０ 軸受
２１ 外輪
２２ 内輪
２４ 軸受空間
３０ シール部材
３１ スリンガ
３２ 円筒部
３３ 外向きフランジ
３４ ラビリンス隙間
３５ 弾性シール部材
３６ 芯金
３７ａ シールリップ
３７ｂ シールリップ
４０ プーリ軸
４１ フランジ
４２ ボルト
４３ ローレット目
４４ 周溝
４５ 凹部
５０ａ ダストカバー
５０ｂ ダストカバー DESCRIPTION OF SYMBOLS 10 Pulley 11 Belt guide wheel 13 Boss part 20 Bearing 21 Outer ring 22 Inner ring 24 Bearing space 30 Seal member 31 Slinger 32 Cylindrical part 33 Outward flange 34 Labyrinth gap 35 Elastic seal member 36 Core metal 37a Seal lip 37b Seal lip 40 Pulley shaft 41 Flange 42 Bolt 43 Knurled eye 44 Circumferential groove 45 Recess 50a Dust cover 50b Dust cover

Claims (7)

ベルト案内輪の内側にボス部が設けられたプーリと、前記ボス部の内側に組み込まれた外輪回転用の軸受とを有し、前記軸受の外輪と内輪間に形成された軸受空間の両端開口のそれぞれをシール部材によりシールしたプーリユニットにおいて、
前記シール部材が、前記内輪の外径面端部に圧入される円筒部を具え、その円筒部の圧入時における先行側の端部に外向きフランジが設けられ、その外向きフランジの外径面が前記外輪の内径面との間でラビリンス隙間を形成する外径とされた断面Ｌ形のスリンガと、前記外輪の内径面における両端部に外周部が支持され、芯金によって補強された弾性シール部材とを有し、前記弾性シール部材の内周部に、内径端が弾性シール部材の外側面より外方に位置する内向き傾斜の複数のシールリップを設け、その複数のシールリップのそれぞれ先端部を前記スリンガの円筒部に弾性接触させたことを特徴とするプーリユニット。 Both ends of a bearing space formed between an outer ring and an inner ring of the bearing having a pulley provided with a boss part inside the belt guide wheel and a bearing for rotating an outer ring incorporated inside the boss part In the pulley unit in which each is sealed with a seal member,
The seal member includes a cylindrical portion that is press-fitted into the outer diameter surface end portion of the inner ring, and an outward flange is provided at the leading end portion during the press-fitting of the cylindrical portion, and the outer diameter surface of the outward flange Is a slinger having an L-shaped cross section that forms a labyrinth gap with the inner diameter surface of the outer ring, and an elastic seal that is supported at both ends of the inner diameter surface of the outer ring and is reinforced by a metal core. A plurality of inwardly inclined seal lips whose inner diameter ends are located outward from the outer surface of the elastic seal member, and the respective tips of the plurality of seal lips are provided at the inner periphery of the elastic seal member. A pulley unit characterized in that a portion is brought into elastic contact with the cylindrical portion of the slinger. 前記弾性シール部材が、ニトリルゴム、アクリルゴム、フッ素ゴムの一種から形成されて加硫接着により前記芯金に固着された請求項１に記載のプーリユニット。   The pulley unit according to claim 1, wherein the elastic seal member is formed of a kind of nitrile rubber, acrylic rubber, or fluororubber and is fixed to the core metal by vulcanization adhesion. 前記プーリが、前記軸受の外輪外径面上において成形された樹脂成形品からなる請求項１又は２に記載のプーリユニット。   The pulley unit according to claim 1 or 2, wherein the pulley is made of a resin molded product molded on an outer ring outer diameter surface of the bearing. 前記外輪の外径面にローレット加工を施した請求項３に記載のプーリユニット。   The pulley unit according to claim 3, wherein a knurling process is performed on an outer diameter surface of the outer ring. 前記外輪の外径面に周溝または凹部を設けた請求項３に記載のプーリユニット。   The pulley unit according to claim 3, wherein a circumferential groove or a recess is provided on an outer diameter surface of the outer ring. 前記軸受の外側に、前記軸受の側面および前記ボス部の端部外周を覆う一対のダストカバーを設けた請求項１乃至５のいずれか１項に記載のプーリユニット。   The pulley unit according to any one of claims 1 to 5, wherein a pair of dust covers are provided outside the bearing so as to cover a side surface of the bearing and an outer periphery of an end portion of the boss portion. 前記軸受の内輪内径面に、フランジを一端部に有する筒状のプーリ軸を圧入して軸受とプーリ軸とを一体化した請求項１乃至６のいずれか１項に記載のプーリユニット。   The pulley unit according to any one of claims 1 to 6, wherein a cylindrical pulley shaft having a flange at one end is press-fitted into an inner ring inner surface of the bearing to integrate the bearing and the pulley shaft.
JP2014071574A 2014-03-31 2014-03-31 pulley unit Pending JP2015194175A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107524785A (en) * 2017-10-19 2017-12-29 浙江瑞德利汽车部件有限公司 A kind of dustproof automotive idle pulley
CN108775391A (en) * 2018-08-14 2018-11-09 浙江瑞德利汽车部件有限公司 A kind of anti-dropout idle pulley assembly
JP2021081011A (en) * 2019-11-20 2021-05-27 日野自動車株式会社 Pulley unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107524785A (en) * 2017-10-19 2017-12-29 浙江瑞德利汽车部件有限公司 A kind of dustproof automotive idle pulley
CN108775391A (en) * 2018-08-14 2018-11-09 浙江瑞德利汽车部件有限公司 A kind of anti-dropout idle pulley assembly
JP2021081011A (en) * 2019-11-20 2021-05-27 日野自動車株式会社 Pulley unit
JP7290552B2 (en) 2019-11-20 2023-06-13 日野自動車株式会社 pulley unit

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