JP6275453B2 - Pulley unit - Google Patents

Pulley unit Download PDF

Info

Publication number
JP6275453B2
JP6275453B2 JP2013236681A JP2013236681A JP6275453B2 JP 6275453 B2 JP6275453 B2 JP 6275453B2 JP 2013236681 A JP2013236681 A JP 2013236681A JP 2013236681 A JP2013236681 A JP 2013236681A JP 6275453 B2 JP6275453 B2 JP 6275453B2
Authority
JP
Japan
Prior art keywords
pulley
guide wheel
seal member
belt guide
rolling bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2013236681A
Other languages
Japanese (ja)
Other versions
JP2015096751A (en
Inventor
中尾　吾朗
吾朗 中尾
光浩 杉浦
光浩 杉浦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Original Assignee
NTN Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTN Corp filed Critical NTN Corp
Priority to JP2013236681A priority Critical patent/JP6275453B2/en
Publication of JP2015096751A publication Critical patent/JP2015096751A/en
Application granted granted Critical
Publication of JP6275453B2 publication Critical patent/JP6275453B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7843—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc
    • F16C33/7853—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with one or more sealing lips to contact the inner race

Landscapes

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

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プーリユニットに関する。   The present invention relates to a pulley unit that guides the 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、軸受シールのみでは、その軸受シールに異物が直接に接触して損傷させる可能性がある。   Therefore, in the pulley unit, a rolling bearing with a seal is generally adopted as the rolling bearing. However, with the bearing seal alone, foreign matter may directly contact the bearing seal and be damaged.

そのような不都合を解消するため、特許文献１に記載されたプーリユニットにおいては、プーリの両側に一対のダストカバーを設け、そのダストカバーによりプーリのボス部内に組み込まれた転がり軸受を覆うようにしている。   In order to eliminate such inconvenience, in the pulley unit described in Patent Document 1, a pair of dust covers are provided on both sides of the pulley, and the dust bearing covers the rolling bearing incorporated in the boss portion of the pulley. ing.

ここで、特許文献１に記載されたダストカバーにおいては、転がり軸受の内輪側面を覆う環状板部の外周にテーパ部を連設し、そのテーパ部の大径端にプーリのボス部側面に対向配置される円板部を設け、その円板部の外周にプーリのボス部外径面間に微小な隙間を形成する円筒部を連設した構成とされている。   Here, in the dust cover described in Patent Document 1, a tapered portion is continuously provided on the outer periphery of the annular plate portion covering the inner ring side surface of the rolling bearing, and the large diameter end of the tapered portion faces the side surface of the boss portion of the pulley. A disc portion to be disposed is provided, and a cylindrical portion that forms a minute gap between the outer diameter surfaces of the boss portions of the pulley is provided continuously on the outer periphery of the disc portion.

特開２０１０−２７０８８２号公報JP 2010-270882 A

ところで、上記特許文献１に記載されたプーリユニットにおいては、ダストカバーによって転がり軸受の全体を覆うことができるため、異物の衝突による軸受シールの損傷防止に効果を挙げることができるが、ボス部外径面とダストカバーの円筒部間に隙間が存在するため、高圧洗浄水や勢いよく跳ね上げられた泥水の入り込みを完全に防止することができない。また、ダストカバー内に高圧洗浄水や泥水が一旦入り込むと自然に排出させることが困難であり、ダストカバー内部に滞留する高圧洗浄水や泥水との接触によって軸受シールを早期に劣化、損傷させる可能性がある。   By the way, in the pulley unit described in Patent Document 1, since the entire rolling bearing can be covered with the dust cover, it can be effective in preventing damage to the bearing seal due to the collision of foreign matter. Since there is a gap between the radial surface and the cylindrical portion of the dust cover, it is not possible to completely prevent the entry of high-pressure washing water or mud splashed up vigorously. In addition, once high-pressure cleaning water or muddy water enters the dust cover, it is difficult to discharge naturally, and contact with the high-pressure cleaning water or muddy water staying inside the dust cover can cause early deterioration and damage to the bearing seal. There is sex.

この発明の課題は、転がり軸受を覆うダストカバー内に高圧洗浄水や泥水が入り込むのを効果的に防止できるようにすることである。   An object of the present invention is to effectively prevent high-pressure cleaning water and muddy water from entering a dust cover that covers a rolling bearing.

上記の課題を解決するため、この発明においては、ベルト案内輪の内径面に環状フランジが設けられ、その環状フランジの内径部にボス部が設けられたプーリと、そのプーリのボス部内に組み込まれた転がり軸受と、その転がり軸受の内輪側面に片面内周部が密着する取り付けとされて前記転がり軸受の両側部を覆う一対のダストカバーとを有してなるプーリユニットにおいて、前記一対のダストカバーのそれぞれ外周部に、前記プーリの側面に対して隙間をもって対向配置され、外側面に対する外圧の負荷により弾性変形してプーリ側面に密着する環状の柔軟性を有するシール部材を設けた構成を採用したのである。   In order to solve the above problems, in the present invention, an annular flange is provided on the inner diameter surface of the belt guide wheel, and a boss portion is provided on the inner diameter portion of the annular flange, and the pulley is incorporated in the boss portion of the pulley. A pair of dust covers, comprising: a rolling bearing, and a pair of dust covers that are attached so that an inner peripheral portion of one side thereof is in close contact with an inner ring side surface of the rolling bearing and covers both side portions of the rolling bearing. A configuration is adopted in which each of the outer peripheral portions is provided with a sealing member having an annular flexibility that is opposed to the side surface of the pulley with a gap and is elastically deformed by an external pressure load on the outer side surface and closely contacts the pulley side surface. It is.

上記のように、転がり軸受の両側部を覆う一対のダストカバーのそれぞれ外周部にプーリ側面との間に隙間をもって対向配置され、外側面に対する外圧の負荷により弾性変形する柔軟性を有するシール部材を設けることによって、高圧洗浄水や勢いよく跳ね上げられた泥水がシール部材の外側面に衝突すると、その衝突によりシール部材が内方向に弾性変形してプーリの側面に密着し、その密着によって高圧洗浄水や泥水の入り込みが防止される。   As described above, a seal member having a flexibility to be elastically deformed by a load of external pressure applied to the outer surface of each of the pair of dust covers covering both sides of the rolling bearing is disposed opposite to each other with a gap between the pulley side surfaces. When the high-pressure washing water or the muddy water splashed up vigorously collides with the outer surface of the seal member, the seal member elastically deforms inward due to the collision and closely contacts the side surface of the pulley. Ingress of water and muddy water is prevented.

ここで、シール部材は、ベルト案内輪の側面に対して対向配置してもよく、あるいは、ベルト案内輪の側面内周部に形成された環状凹部の側面に対して対向配置してもよい。環状凹部の側面にシール部材を対向配置させる場合、そのシール部材の外径面と環状凹部の外周壁内径面との対向部間に隙間を設けることによって、そのシール部材の外径側の隙間および環状凹部の側面間に形成される隙間がラビリンスを形成するため、高圧洗浄水や泥水の入り込みを効果的に防止することができる。   Here, the seal member may be disposed to face the side surface of the belt guide wheel, or may be disposed to face the side surface of the annular recess formed in the inner peripheral portion of the side surface of the belt guide wheel. When the sealing member is disposed opposite to the side surface of the annular recess, a clearance is provided between the opposing portions of the outer diameter surface of the sealing member and the inner peripheral surface of the outer peripheral wall of the annular recess. Since the gap formed between the side surfaces of the annular recess forms a labyrinth, entry of high-pressure washing water and muddy water can be effectively prevented.

シール部材とプーリ側面の対向部間に形成された隙間が必要以上に大きくなると、シール部材の内方向への弾性変形時に、そのシール部材をプーリ側面に密着させることができなくなる可能性があるため、上記隙間は１ｍｍ以下としておくのが好ましい。   If the gap formed between the opposing portions of the seal member and the pulley side surface becomes larger than necessary, the seal member may not be brought into close contact with the pulley side surface when the seal member is elastically deformed inward. The gap is preferably 1 mm or less.

シール部材は、上記のように、その弾性変形によりプーリ側面に密着してシール性を確保するため、弾性変形能に優れたシール部材とするのが好ましい。ここで、シール部材を断面矩形とし、その軸方向厚さをａとし、外径面からダストカバーの外径面に至る径方向幅をｂとしたとき、軸方向厚さａを、ａ＝ｂ／５以下とすることにより弾性変形能に優れた良好なシール性を発揮するシール部材を得ることができる。   As described above, the seal member is preferably a seal member having excellent elastic deformability in order to be in close contact with the side surface of the pulley due to its elastic deformation and to secure a sealing property. Here, when the sealing member has a rectangular cross section, the axial thickness thereof is a, and the radial width from the outer diameter surface to the outer diameter surface of the dust cover is b, the axial thickness a is a = b By setting the ratio to / 5 or less, it is possible to obtain a sealing member that exhibits excellent sealing performance and excellent elastic deformability.

また、シール部材の硬度が必要以上に高くなると、弾性変形能が悪くなるため、シール部材の硬度は７０Ｈｓ以下とするのが好ましい。   Further, if the hardness of the seal member becomes higher than necessary, the elastic deformability deteriorates, so the hardness of the seal member is preferably 70 Hs or less.

シール部材は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。   The seal member is preferably made of rubber having excellent flexibility and wear resistance. Examples of such rubber include nitrile rubber, acrylic rubber, and fluoro rubber.

この発明に係るプーリユニットにおいて、プーリとシール部材の対向面における少なくとも一方に複数の溝を設けると、その溝内に水が入り込んだ際、その水の表面張力によって泥水の入り込みが抑制されることになり、泥水の入り込みを効果的に防止することができる。この場合、溝は半径方向に延びる放射状配置のものであってもよく、径の異なる環状溝からなるものであってもよい。   In the pulley unit according to the present invention, when a plurality of grooves are provided in at least one of the facing surfaces of the pulley and the seal member, when water enters the groove, entry of muddy water is suppressed by the surface tension of the water. It is possible to effectively prevent muddy water from entering. In this case, the grooves may have a radial arrangement extending in the radial direction, or may be annular grooves having different diameters.

また、ベルト案内輪の内径面を開口端を大径端とするテーパ面とすると、ダストカバー内に泥水が万一入り込んだ際、その入り込んだ泥水はプーリの回転による遠心力により径方向外方に移動して上記テーパ面で案内されて外部に導かれることになるため、入り込んだ泥水を外部にスムーズに排出させることができる。   Also, if the inner diameter surface of the belt guide wheel is a tapered surface with the opening end as the large diameter end, when muddy water enters the dust cover, the muddy water enters the outer side in the radial direction due to centrifugal force due to the rotation of the pulley. Therefore, the muddy water that has entered can be smoothly discharged to the outside.

この発明においては、上記のように、転がり軸受の両側部を覆う一対のダストカバーのそれぞれ外周部にプーリ側面との間に隙間をもって対向配置され、外側面に対する外圧の負荷により弾性変形するシール部材を設けたことにより、高圧洗浄水や勢いよく跳ね上げられた泥水がシール部材の外側面に衝突すると、その衝突によりシール部材が内方向に弾性変形してプーリの側面に密着して対向部間をシールするため、高圧洗浄水や泥水の入り込みを効果的に防止することができる。   In the present invention, as described above, the seal members are arranged to face each other on the outer peripheral portions of the pair of dust covers covering both side portions of the rolling bearing with a gap between the pulley side surfaces and elastically deformed by the load of the external pressure on the outer surface. When the high-pressure washing water or the splashed muddy water collides with the outer surface of the seal member, the seal member elastically deforms inward due to the collision and closely contacts the side surface of the pulley. Therefore, it is possible to effectively prevent high-pressure washing water and muddy water from entering.

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 （I）は図１のシール部材の取り付け部を拡大して示す断面図、（II）はシール部材が弾性変形した状態を示す断面図(I) is a cross-sectional view showing an enlarged attachment portion of the seal member of FIG. 1, and (II) is a cross-sectional view showing a state where the seal member is elastically deformed. この発明に係るプーリユニットの他の実施の形態を示す縦断面図Longitudinal sectional view showing another embodiment of the pulley unit according to the present invention （I）はベルト案内輪の他の例を示す断面図、（II）は（I）の平面図(I) is a sectional view showing another example of a belt guide wheel, (II) is a plan view of (I) （I）はシール部材の他の例を示す断面図、（II）は（I）の平面図(I) is a sectional view showing another example of a sealing member, (II) is a plan view of (I) この発明に係るプーリユニットのさらに他の実施の形態を示す縦断面図A longitudinal sectional view showing still another embodiment of the pulley unit according to the present 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転がり軸受２０と、その転がり軸受２０の両側面を覆う一対のダストカバー３０とを有している。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the pulley unit includes a pulley 10, a rolling bearing 20 that rotatably supports the pulley 10, and a pair of dust covers 30 that cover both side surfaces of the rolling bearing 20.

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る。なお、樹脂の成形品に変えて鋳造品であってもよい。   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. It consists of goods. A cast product may be used instead of the resin molded product.

ベルト案内輪１１として、ここでは、外径面が円筒面１４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 14, but is for V belt guidance in which a plurality of V grooves are formed on the outer diameter surface. Also good.

転がり軸受２０は、外輪２１、内輪２２、その両輪２１、２２間に組み込まれた複数のボール２３およびそのボール２３を保持する保持器２４とを有し、上記保持器２４の軸方向両側に一対のシール２５を組み込んだシール付きの深みぞ玉軸受からなり、上記外輪２１はプーリ１０のボス部１３の内径面にインサート成形されてプーリ１０と一体化されている。   The rolling bearing 20 has an outer ring 21, an inner ring 22, a plurality of balls 23 incorporated between the two rings 21 and 22, and a cage 24 that holds the balls 23, and a pair is provided on both sides in the axial direction of the cage 24. The outer ring 21 is insert-molded on the inner diameter surface of the boss portion 13 of the pulley 10 and integrated with the pulley 10.

転がり軸受２０の内輪２２は、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５０の締め付けにより、そのプーリ取付け対象Ａに固定される。上記ボルト５０には、フランジ５１および頭部５２が設けられている。   The inner ring 22 of the rolling bearing 20 is fixed to the pulley mounting target A by tightening a bolt 50 that is inserted inside the rolling bearing 20 and screwed into the pulley mounting target A such as an engine block. The bolt 50 is provided with a flange 51 and a head 52.

一対のダストカバー３０のそれぞれは、環状板部３１の大径端にテーパ部３２が連設され、そのテーパ部３２の大径端に径方向外方に向く円板部３３が連設された鋼板のプレス成形品からなる。   In each of the pair of dust covers 30, a tapered portion 32 is continuously provided at the large-diameter end of the annular plate portion 31, and a circular plate portion 33 that is directed radially outward is continuously provided at the large-diameter end of the tapered portion 32. It consists of a steel plate press-formed product.

一対のダストカバー３０のうち、一方のダストカバー３０は、ボルト５０のフランジ５１と軸受内輪２２により内周部が両側から挟持されて軸受内輪２２の側面に密着する取り付けとされていると共に、他方のダストカバー３０は軸受内輪２２とプーリ取付け対象Ａにより内周部が両側から挟持されて軸受内輪２２の側面に密着する取り付けとされ、その取り付けによって転がり軸受２０の両側面が一対のダストカバー３０で覆われる。   Of the pair of dust covers 30, one dust cover 30 is attached so that the inner peripheral portion is sandwiched from both sides by the flange 51 of the bolt 50 and the bearing inner ring 22 and is in close contact with the side surface of the bearing inner ring 22. The dust cover 30 is attached so that the inner peripheral portion is sandwiched from both sides by the bearing inner ring 22 and the pulley mounting object A and is in close contact with the side surface of the bearing inner ring 22, and the both side surfaces of the rolling bearing 20 are attached to the pair of dust covers 30. Covered with.

一対のダストカバー３０における円板部３３のそれぞれの外周部には環状のシール部材３４が設けられている。図２（I）に示すように、シール部材３４は、断面矩形とされ、内周部にはダストカバー３０の円板部３３の外周部を覆う被覆部３５が設けられ、その被覆部３５が円板部３３に固着されている。   An annular seal member 34 is provided on each outer peripheral portion of the disk portion 33 in the pair of dust covers 30. As shown in FIG. 2 (I), the seal member 34 has a rectangular cross section, and an inner peripheral portion is provided with a covering portion 35 that covers the outer peripheral portion of the disc portion 33 of the dust cover 30. The disk portion 33 is fixed.

シール部材３４は、プーリ１０のベルト案内輪１１の側面に対向配置されて、そのベルト案内輪１１の側面間に隙間３６が設けられている。また、シール部材３４はゴムにより形成されて弾性変形可能とされ、外圧が負荷されると、図２（II）に示すように、内方に弾性変形してベルト案内輪１１の側面に密着し、対向部間をシールするようになっている。   The seal member 34 is disposed to face the side surface of the belt guide wheel 11 of the pulley 10, and a gap 36 is provided between the side surfaces of the belt guide wheel 11. Further, the seal member 34 is made of rubber and can be elastically deformed. When an external pressure is applied, the seal member 34 is elastically deformed inward and is in close contact with the side surface of the belt guide wheel 11 as shown in FIG. The space between the opposing portions is sealed.

シール部材３４は、上記のように、弾性変形によってベルト案内輪１１の側面に密着してシール性を保持し、その密着時において、ベルト案内輪１１はシール部材３４に対して接触回転するため、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。   As described above, the seal member 34 is brought into close contact with the side surface of the belt guide wheel 11 by elastic deformation to maintain the sealing performance. At the time of the close contact, the belt guide wheel 11 rotates in contact with the seal member 34. It is preferable to form the rubber with excellent flexibility and wear resistance. Examples of such rubber include nitrile rubber, acrylic rubber, and fluoro rubber.

ここで、弾性変形したシール部材３４をベルト案内輪１１の側面に確実に接触させるため、そのベルト案内輪１１とシール部材３４の対向部間に形成される隙間３６を１ｍｍ以下の大きさとしている。   Here, in order to ensure that the elastically deformed seal member 34 is brought into contact with the side surface of the belt guide wheel 11, the gap 36 formed between the opposed portions of the belt guide wheel 11 and the seal member 34 has a size of 1 mm or less. .

また、断面矩形とされたシール部材３４の軸方向厚さをａとし、円板部３３の外径面からシール部材３４の外径面間の径方向幅をｂとしたとき、軸方向厚さａを、ａ＝ｂ／５以下とし、さらに、シール部材３４の硬度を７０Ｈｓ以下としている。   Further, when the axial thickness of the seal member 34 having a rectangular cross section is a, and the radial width between the outer diameter surface of the disc portion 33 and the outer diameter surface of the seal member 34 is b, the axial thickness a is a = b / 5 or less, and the hardness of the sealing member 34 is 70 Hs or less.

図１および図２に示すように、転がり軸受２０の両側部を覆う一対のダストカバー３０のそれぞれ外周部にプーリ１０側面との間に隙間３６をもって対向配置され、外側面に対する外圧の負荷により弾性変形するシール部材３４を設けたことにより、高圧洗浄水や勢いよく跳ね上げられた泥水がシール部材３４の外側面に衝突すると、その衝突によりシール部材３４が内方向に弾性変形してプーリ１０の側面に密着して対向部間をシールすることになる。このため、高圧洗浄水や泥水がダストカバー３０の内側に入り込むのを効果的に防止することができる。   As shown in FIG. 1 and FIG. 2, a pair of dust covers 30 covering both sides of the rolling bearing 20 are arranged to face each other with a gap 36 between the sides of the pulley 10 and elastic with a load of external pressure on the outer surface. By providing the deformable seal member 34, when the high-pressure washing water or the muddy water splashed up vigorously collides with the outer surface of the seal member 34, the seal member 34 is elastically deformed inward by the collision, and the pulley 10 It will be in close contact with the side and seal between the opposing parts. For this reason, it is possible to effectively prevent the high-pressure washing water and muddy water from entering the inside of the dust cover 30.

図１においては、ベルト案内輪１１の側面を平面とし、その平面からなる側面にシール部材３４を対向させるようにしたが、図３では、ベルト案内輪１１の側面内周部にシール部材３４が収容される環状凹部１５を形成し、その環状凹部１５の側面に対して隙間３６をもってシール部材３４を対向配置し、そのシール部材３４の外径面と環状凹部１５の外周壁内径面の対向部間にも隙間３７を設けている。   In FIG. 1, the side surface of the belt guide wheel 11 is a flat surface, and the seal member 34 is opposed to the side surface composed of the flat surface. However, in FIG. An annular recess 15 to be accommodated is formed, a seal member 34 is disposed opposite to the side surface of the annular recess 15 with a gap 36, and an outer diameter surface of the seal member 34 and an outer peripheral wall inner diameter surface of the annular recess 15 are opposed to each other. A gap 37 is also provided therebetween.

図３に示すように、ベルト案内輪１１の側面内周部に形成された環状凹部１５の側面に隙間３６をもってシール部材３４を対向配置し、そのシール部材３４の外径面と環状凹部１５の外周壁内径面の対向部間にも隙間３７を設けることにより、シール部材３４の外径側の隙間３７および環状凹部の側面間に形成される隙間３６がラビリンスを形成するため、高圧洗浄水や泥水の入り込みを効果的に防止することができる。   As shown in FIG. 3, a seal member 34 is disposed opposite to the side surface of the annular recess 15 formed in the inner peripheral portion of the side surface of the belt guide wheel 11 with a gap 36, and the outer diameter surface of the seal member 34 and the annular recess 15 Since the gap 37 is also provided between the opposed portions of the inner peripheral surface of the outer peripheral wall, the gap 37 formed between the outer diameter side of the seal member 34 and the side surface of the annular recess forms a labyrinth. Intrusion of muddy water can be effectively prevented.

また、図３に示すように、ベルト案内輪１１の両側の内径面のそれぞれを開口端が大径端とされるテーパ面１６を形成すると、ダストカバー３０内に泥水が万一入り込んだとしても、その入り込んだ泥水はプーリ１０の回転による遠心力によって径方向外方に向けて移動した際に、ダストカバー３０のテーパ部３２およびベルト案内輪１１に形成された上記テーパ面１６によって外部にスムーズに導かれることになり、入り込んだ泥水を外部にスムーズに排出することができる。   Further, as shown in FIG. 3, if each of the inner diameter surfaces on both sides of the belt guide wheel 11 is formed with a tapered surface 16 whose opening end is a large diameter end, even if muddy water enters the dust cover 30. When the muddy water that has entered moves outward in the radial direction by the centrifugal force generated by the rotation of the pulley 10, the muddy water smoothly flows to the outside due to the tapered portion 32 of the dust cover 30 and the tapered surface 16 formed on the belt guide wheel 11. As a result, the muddy water that has entered can be smoothly discharged to the outside.

図４（I）、（II）に示すように、プーリ１０におけるベルト案内輪１１の側面に複数の溝１７を放射状に設け、あるいは、図５（I）、（II）に示すように、シール部材３４のベルト案内輪１１に対する対向面に複数の溝３８を放射状に設けることにより、これらの溝１７、３８内に水が入り込んだ際、その水の表面張力によって泥水の入り込みが抑制されることになる。このため、泥水の入り込みを効果的に防止することができる。なお、１７、３８は径の異なる複数の環状溝からなるものであってもよい。   As shown in FIGS. 4 (I) and (II), a plurality of grooves 17 are provided radially on the side surface of the belt guide wheel 11 in the pulley 10, or as shown in FIGS. 5 (I) and (II) By providing a plurality of grooves 38 radially on the surface of the member 34 facing the belt guide wheel 11, when water enters the grooves 17, 38, entry of muddy water is suppressed by the surface tension of the water. become. For this reason, entry of muddy water can be effectively prevented. In addition, 17 and 38 may consist of a plurality of annular grooves having different diameters.

図１では、シール部材３４をベルト案内輪１１の側面に対して隙間３６をもって対向配置したが、図６に示すように、ダストカバー３０の円板部３３の外周に円筒部３９を設け、その円筒部３９の開口端部にシール部材４０を固着し、そのシール部材４０に設けられた柔軟性を有する弾性変形可能なシールリップ４１を環状フランジ１２の側面に対して隙間４２をもって対向配置してもよい。   In FIG. 1, the seal member 34 is disposed to face the side surface of the belt guide wheel 11 with a gap 36. However, as shown in FIG. 6, a cylindrical portion 39 is provided on the outer periphery of the disc portion 33 of the dust cover 30. A sealing member 40 is fixed to the opening end of the cylindrical portion 39, and a flexible elastically deformable sealing lip 41 provided on the sealing member 40 is disposed opposite to the side surface of the annular flange 12 with a gap 42 therebetween. Also good.

１０ プーリ
１１ ベルト案内輪
１２ 環状フランジ
１３ ボス部
１５ 環状凹部
１６ テーパ面
１７ 溝
２０ 転がり軸受
３０ ダストカバー
３４ シール部材
３６ 隙間
３７ 隙間
３８ 溝
３９ 円筒部
４０ シール部材
４２ 隙間 DESCRIPTION OF SYMBOLS 10 Pulley 11 Belt guide wheel 12 Annular flange 13 Boss part 15 Annular recessed part 16 Tapered surface 17 Groove 20 Rolling bearing 30 Dust cover 34 Seal member 36 Gap 37 Gap 38 Groove 39 Cylindrical part 40 Seal member 42 Gap

Claims (4)

ベルト案内輪（１１）の内径面に環状フランジ（１２）が設けられ、その環状フランジ（１２）の内径部にボス部（１３）が設けられたプーリ（１０）と、
前記プーリ（１０）のボス部（１３）の内径側に一体に組み込まれた外輪（２１）と、前記外輪（２１）の内径側に設けられる内輪（２２）と、前記外輪（２１）と前記内輪（２２）との間に組み込まれた 一対のシール（２５）とを備えた転がり軸受（２０）と、
前記転がり軸受（２０）の内輪（２２）側面に片面内周部が密着する取り付けとされて前記転がり軸受（２０）の両側部を覆う一対のダストカバー（３０）とを有してなるプーリユニットにおいて、
前記ダストカバー（３０）は、前記片面内周部を構成する環状板部（３１）と、前記環状板部（３１）の大径端に連設され外径側へ向かうにつれて軸方向外側へ向かうテーパ部（３２）と、そのテーパ部（３２）の大径端に連設され径方向外方に向く円板部（３３）とを備え、
前記一対のダストカバー（３０）における前記円板部（３３）の外周部に、前記プーリ（１０）の前記ベルト案内輪（１１）の側面に対して隙間（３６）をもって対向配置され、外側面に対する外圧の負荷により弾性変形して前記ベルト案内輪（１１）の 側面に密着する環状の柔軟性を有するシール部材（３４）を設けたことを特徴とするプーリユニット。 A pulley (10) in which an annular flange (12) is provided on an inner diameter surface of the belt guide wheel (11), and a boss portion (13) is provided on an inner diameter portion of the annular flange (12);
Wherein an outer ring (21) incorporated integrally on the inner diameter side of the boss portion of the pulley (10) (13), an inner ring (22) provided on the inner diameter side of the outer ring (21), and said outer ring (21) A rolling bearing (20) comprising a pair of seals (25) incorporated between the inner ring (22) and
A pulley unit comprising a pair of dust covers (30) that are attached so that the inner peripheral portion of one surface is in close contact with the side surface of the inner ring (22) of the rolling bearing (20) and covers both side portions of the rolling bearing (20). In
The dust cover (30) is connected to the annular plate portion (31) constituting the inner peripheral portion of the one surface and the large-diameter end of the annular plate portion (31), and goes outward in the axial direction toward the outer diameter side. A tapered portion (32), and a disc portion (33) connected to the large-diameter end of the tapered portion (32) and facing radially outward,
The outer periphery of the pair of dust covers (30) is disposed on the outer peripheral portion of the disk portion (33) so as to face the side surface of the belt guide wheel (11) of the pulley (10) with a gap (36). A pulley unit comprising a sealing member (34) having an annular flexibility that is elastically deformed by an external pressure load on the belt and closely contacts a side surface of the belt guide wheel (11) . 前記シール部材（３４）が、前記ベルト案内輪（１１）の側面内周部に形成された環状凹部（１５）の側面に対して隙間（３６）をもって対向配置されて、外径面と環状凹部（１５）の外周壁内径面との対向部間にも隙間（３７）が設けられた請求項１に記載のプーリユニット。   The seal member (34) is disposed to face the side surface of the annular recess (15) formed in the inner peripheral portion of the side surface of the belt guide wheel (11) with a gap (36), and the outer diameter surface and the annular recess The pulley unit according to claim 1, wherein a gap (37) is also provided between the opposed portions of the outer peripheral wall inner surface of (15). 前記シール部材（３４）が、断面矩形とされ、そのシール部材（３４）の軸方向厚さをａとし、外径面からダストカバー（３０）の外径面に至る径方向幅をｂとしたとき、軸方向厚さａが、ａ＝ｂ／５以下とされた請求項１又は２に記載のプーリユニット。 The sealing member (34) has a rectangular cross section, the axial thickness of the sealing member (34) is a, and the radial width from the outer diameter surface to the outer diameter surface of the dust cover (30) is b. 3. The pulley unit according to claim 1, wherein the axial thickness a is a = b / 5 or less. 前記プーリ（１０）と前記シール部材（３４）の対向面における少なくとも一方に複数の溝（１７、３８）が形成された請求項１乃至３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 3 , wherein a plurality of grooves (17, 38) are formed in at least one of opposing surfaces of the pulley (10) and the seal member (34).
JP2013236681A 2013-11-15 2013-11-15 Pulley unit Expired - Fee Related JP6275453B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2013236681A JP6275453B2 (en) 2013-11-15 2013-11-15 Pulley unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2013236681A JP6275453B2 (en) 2013-11-15 2013-11-15 Pulley unit

Publications (2)

Publication Number Publication Date
JP2015096751A JP2015096751A (en) 2015-05-21
JP6275453B2 true JP6275453B2 (en) 2018-02-07

Family

ID=53374131

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2013236681A Expired - Fee Related JP6275453B2 (en) 2013-11-15 2013-11-15 Pulley unit

Country Status (1)

Country Link
JP (1) JP6275453B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110873122B (en) * 2019-11-26 2021-04-30 柳州上汽汽车变速器有限公司 Speed changer bearing
CN117023357A (en) * 2023-09-08 2023-11-10 安徽吉思特智能装备有限公司 Chassis line lifting appliance with anti-jamming effect

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02116054U (en) * 1989-03-03 1990-09-17
JP4595822B2 (en) * 2006-01-24 2010-12-08 株式会社ジェイテクト Manufacturing method of bearing integrated pulley
JP2008169915A (en) * 2007-01-11 2008-07-24 Ntn Corp Pulley with aligning function
JP5360562B2 (en) * 2009-05-25 2013-12-04 Ｎｔｎ株式会社 Bearing with pulley and dust cover used therefor

Also Published As

Publication number Publication date
JP2015096751A (en) 2015-05-21

Similar Documents

Publication Publication Date Title
JP5170369B2 (en) Sealing device
JP6876610B2 (en) Sealing device
JP5969267B2 (en) Bearing for outer ring rotation
JP2008151174A (en) Sealing device
US20150377299A1 (en) Rolling bearing with sealing subassembly
JP6382550B2 (en) Pulley unit
US10208802B2 (en) Sealing device
JP6275453B2 (en) Pulley unit
JP6755156B2 (en) Rolling bearing with seal for pulley unit
JP6777466B2 (en) Pulley unit
US9546686B2 (en) Rolling bearing comprising a sealing flange
JP2015194175A (en) pulley unit
JP6490348B2 (en) Pulley unit
JP2015209954A (en) Pulley unit
JP2009074589A (en) Sealing device
JP6817698B2 (en) Rolling bearings with sealing flanges
CN210118363U (en) Hub unit bearing
JP2018017264A (en) Roller bearing with seal
US11421738B2 (en) Bearing sealing device
JP2008175301A (en) Rolling bearing with sealing device
JP2016160943A (en) Bearing for pulley
JP5293420B2 (en) Sealing device
JP2012163124A (en) Rolling bearing apparatus with pulley
JP5564180B2 (en) Sealing device, rolling bearing and wheel rolling bearing
JP2015052363A (en) Pulley unit for automobile accessory

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20161026

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20170620

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20170622

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20170821

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20171212

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20180110

R150 Certificate of patent or registration of utility model

Ref document number: 6275453

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

LAPS Cancellation because of no payment of annual fees