JPH1019101A - Pulley unit - Google Patents
Pulley unitInfo
- Publication number
- JPH1019101A JPH1019101A JP19278296A JP19278296A JPH1019101A JP H1019101 A JPH1019101 A JP H1019101A JP 19278296 A JP19278296 A JP 19278296A JP 19278296 A JP19278296 A JP 19278296A JP H1019101 A JPH1019101 A JP H1019101A
- Authority
- JP
- Japan
- Prior art keywords
- cover
- bearing
- pulley
- shaft
- ring
- 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.)
- Pending
Links
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 238000005096 rolling process Methods 0.000 claims description 4
- 230000008961 swelling Effects 0.000 claims description 2
- 239000004519 grease Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 10
- 239000013535 sea water Substances 0.000 abstract description 3
- 238000009423 ventilation Methods 0.000 abstract description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract 1
- 238000003754 machining Methods 0.000 abstract 1
- 238000012856 packing Methods 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 229920003002 synthetic resin Polymers 0.000 description 4
- 239000000057 synthetic resin Substances 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- POIUWJQBRNEFGX-XAMSXPGMSA-N cathelicidin Chemical compound C([C@@H](C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H]([C@@H](C)CC)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C(C)C)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CO)C(O)=O)NC(=O)[C@H](CC=1C=CC=CC=1)NC(=O)[C@H](CC(O)=O)NC(=O)CNC(=O)[C@H](CC(C)C)NC(=O)[C@@H](N)CC(C)C)C1=CC=CC=C1 POIUWJQBRNEFGX-XAMSXPGMSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
- F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
- F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
- F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members
Landscapes
- Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、テンションプー
リ等に用いられるプーリユニット、例えば、船外機用エ
ンジンのカムシャフト駆動系に用いられるプーリユニッ
トに関する。The present invention relates to a pulley unit used for a tension pulley or the like, for example, a pulley unit used for a camshaft drive system of an outboard engine.
【０００２】[0002]
【従来の技術】船外機用エンジンでは、カムシャフトの
駆動手段として、車両用エンジンと同様にタイミングベ
ルト機構が一般に用いられており、このタイミングベル
トの張力の調整にテンションプーリが用いられる。船外
機用エンジンに用いられる場合、テンションプーリとな
るプーリユニットは縦型で使用され、軸受内に海水等が
浸入する環境下におかれる。そのため、従来、軸受を覆
うカバーをプーリに装着したものが提案されている。2. Description of the Related Art In an engine for an outboard motor, a timing belt mechanism is generally used as a driving means for a camshaft, similarly to an engine for a vehicle, and a tension pulley is used for adjusting the tension of the timing belt. When used for an engine for an outboard motor, a pulley unit serving as a tension pulley is used in a vertical type, and is placed in an environment where seawater or the like enters the bearing. For this reason, conventionally, a cover has been proposed in which a cover for covering a bearing is attached to a pulley.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来のこの種
のカバーは次の〜の各課題がある。 プーリにカバーを装着するものであるため、プーリに
カバー装着用の溝加工が必要であり、そのため製造工程
が増える。 前記カバーはいずれもプーリに取付けられて軸受を広
範囲に覆うものであるため、軸受内に封入したグリース
の飛散を防止して軸受内に戻す作用は得られない。その
ため、グリース補給のための保守作業を頻繁に行うこと
が必要となる。両面シール付きの軸受を用いれば、グリ
ースの飛散防止効果は得られるが、シールとカバーとを
二重に設けることになるため、構造が複雑でコスト高に
なる。 プーリ内にカバー装着面と反対側から水が浸入し、性
能低下の原因となることがある。 カバーは軸受を密封するものであるため、カバー装着
時に軸受の内圧が上がり、装着が難しくなることがあ
る。また、軸受内のシールに悪影響を及ぼすことがあ
る。However, this type of conventional cover has the following problems. Since the cover is attached to the pulley, a groove for attaching the cover to the pulley is required, and the number of manufacturing steps is increased. Since all of the covers are attached to the pulley and cover the bearing in a wide range, the effect of preventing the grease sealed in the bearing from scattering and returning the grease into the bearing cannot be obtained. Therefore, it is necessary to frequently perform maintenance work for replenishing grease. If a bearing with a double-sided seal is used, the effect of preventing grease from scattering can be obtained, but since the seal and the cover are provided twice, the structure is complicated and the cost increases. Water may enter the pulley from the side opposite to the cover mounting surface, causing a decrease in performance. Since the cover seals the bearing, the internal pressure of the bearing may increase when the cover is mounted, and mounting may be difficult. Also, the seal in the bearing may be adversely affected.
【０００４】この発明は上記の課題を解消するものであ
り、プーリに溝加工を必要とせずにカバーの取付けを行
える簡単な構成のプーリユニットを提供することであ
る。この発明の他の目的は、軸受内への水等の浸入防止
と共に、軸受内の封入グリースの飛散防止効果が得ら
れ、かつ製造が簡単なプーリユニットを提供することを
目的とする。この発明のさらに他の目的は、プーリ内に
カバー装着面と反対側から水が浸入することを防止でき
る簡単な構成のプーリユニットを提供することである。
この発明のさらに他の目的は、カバー装着時の内圧の上
昇を抑制してカバーの装着を容易にすることである。An object of the present invention is to solve the above-mentioned problem and to provide a pulley unit having a simple structure in which a cover can be attached without requiring groove processing on the pulley. It is another object of the present invention to provide a pulley unit which can prevent water or the like from entering the bearing and prevent the grease from being scattered in the bearing, and can be manufactured easily. Still another object of the present invention is to provide a pulley unit having a simple configuration that can prevent water from entering a pulley from a side opposite to a cover mounting surface.
Still another object of the present invention is to suppress an increase in internal pressure at the time of mounting the cover and to facilitate the mounting of the cover.
【０００５】[0005]
【課題を解決するための手段】この発明のプーリユニッ
トは、転がり軸受の外輪の外周にプーリを設け、前記軸
受の内輪を兼用する軸または内輪が取付けられた軸を設
けたプーリユニットにおいて、軸受の内外輪間の空間お
よび前記軸の端面を覆うカバーを設け、このカバーを、
軸受外輪の内径面に形成された溝に外周縁を嵌合させて
取付けるようにしたものである。このように、カバーを
軸受外輪の内径面に形成された溝に取付けるようにする
ことで、前記カバー取付用の溝として、通常のシール付
き軸受におけるシール溝を利用できる。そのため、カバ
ー取付用の特別な加工をプーリや軸受に施すことなく、
カバーの取付が行え、量産性に優れる。上記構成におい
て、カバーの内面と内輪の幅面における外周縁との間に
生じる隙間を微小隙間としても良い。これにより、前記
カバーで軸受内が密封され、軸受内の封入グリースの飛
散防止効果が得られる。そのため、グリース補給の間隔
を長くすることができ、保守の手間が省ける。しかも、
カバーがプーリ内への水の浸入防止と軸受のグリース飛
散防止とを兼用するため、別々にカバーとシールを設け
る場合に比べて構造が簡単で低コストで済む。A pulley unit according to the present invention is characterized in that a pulley is provided on the outer periphery of an outer ring of a rolling bearing, and a shaft which also serves as an inner ring of the bearing or a shaft to which the inner ring is attached is provided. Provide a cover that covers the space between the inner and outer races and the end face of the shaft.
The outer peripheral edge is fitted into a groove formed on the inner diameter surface of the bearing outer ring to be mounted. As described above, by attaching the cover to the groove formed on the inner diameter surface of the bearing outer ring, a seal groove in a normal sealed bearing can be used as the cover attachment groove. For this reason, no special processing for mounting the cover is performed on pulleys and bearings.
The cover can be mounted, and mass production is excellent. In the above configuration, a gap generated between the inner surface of the cover and the outer peripheral edge of the width surface of the inner ring may be a minute gap. Thereby, the inside of the bearing is sealed by the cover, and the effect of preventing the grease sealed in the bearing from scattering can be obtained. Therefore, the grease replenishment interval can be lengthened, and maintenance work can be omitted. Moreover,
Since the cover also serves to prevent water from entering the pulley and to prevent grease from scattering from the bearing, the structure is simpler and lower in cost than when a cover and a seal are separately provided.
【０００６】これらの構成のプーリユニットにおいて、
前記カバーで覆う軸受幅面と反対側の軸受幅面付近で内
外輪間の空間を覆う環状のシールを設けても良い。この
シールは軸受外輪の内径面に形成されたシール溝に嵌合
させて取付け、前記シール溝と前記カバー取付溝とを互
いに幅方向に対称な断面形状とする。このようにシール
溝とカバー取付溝とを対称形状とすることで、前記のよ
うにシール溝をカバー取付溝に兼用させることが一層容
易となり、また軸受外輪の両面の方向性が無くなって組
立作業が簡単となる。また、これらの構成において、前
記プーリを軸受外輪よりも幅方向に広がったものとし、
前記カバーと反対側で、前記プーリの広がり部分の内径
面に微小隙間を介して近接するリング状の詰め物を前記
軸に取付けても良い。これにより、プーリ内にカバーと
反対側から水等が浸入することが防止される。さらに、
これらの構成において、カバーの中心部に、カバー本体
と別体のゴム状弾性体からなるキャップを設け、このキ
ャップが外側へ膨らみ状態に弾性変形することによって
開き状態となる微小通気口を前記キャップに設けても良
い。このように微小通気口付きのキャップを設けた場
合、カバーの装着作業時に密封状態となった後もカバー
の装着作業が進められることにより軸受の内圧が上昇し
ても、前記微小通気口から空気が逃げることができ、無
理な内圧の上昇が抑えられる。そのため、カバーの装着
が内圧で妨げられることが緩和され、またカバーと反対
側のシールに内圧の上昇による位置ずれ等の悪影響を及
ぼすことが防止される。In these pulley units,
An annular seal may be provided to cover the space between the inner and outer rings near the bearing width surface opposite to the bearing width surface covered by the cover. This seal is fitted and fitted in a seal groove formed on the inner diameter surface of the bearing outer ring, and the seal groove and the cover mounting groove have cross-sectional shapes symmetrical in the width direction. By making the seal groove and the cover mounting groove symmetrical in this way, it becomes easier to use the seal groove as the cover mounting groove as described above, and the directivity of both surfaces of the bearing outer ring is lost, thus assembling work. Becomes easier. Further, in these configurations, it is assumed that the pulley is wider in the width direction than the bearing outer ring,
On the opposite side of the cover, a ring-shaped padding that is close to the inner diameter surface of the expanded portion of the pulley via a minute gap may be attached to the shaft. This prevents water or the like from entering the pulley from the side opposite to the cover. further,
In these configurations, a cap made of a rubber-like elastic body that is separate from the cover body is provided at the center of the cover, and the minute air vent that is opened when the cap is elastically deformed to the outwardly swelling state is closed. May be provided. When the cap with the minute vent is provided in this manner, even if the internal pressure of the bearing is increased due to the progress of the cover attaching operation even after the cover is sealed when the cover is attached, the air from the minute vent is provided. Can escape, and an excessive increase in internal pressure can be suppressed. Therefore, the mounting of the cover is prevented from being hindered by the internal pressure, and the seal on the side opposite to the cover is prevented from being adversely affected by a rise in the internal pressure, such as displacement.
【０００７】[0007]
【発明の実施の形態】この発明の一実施形態を図１ない
し図４と共に説明する。このプーリユニット１は、転が
り軸受２の外輪３の外周にプーリ４を設け、内輪５Ａを
兼用する軸５を設けた形式のものである。軸５は、先端
近傍部分の外径面に軌道溝６を形成すると共に、その基
端側に並べてシール接触溝１９を形成してあり、これら
軌道溝６およびシール接触溝１９の形成された付近の部
分が軸受２の内輪５Ａとなる。軸５の基端は、小径軸部
５ｂを突設して段付軸状としてあり、小径軸部５ｂをプ
ーリ取付板７の座繰り付きのプーリ軸穴８に嵌合させて
先端を加締ることにより、軸５をプーリ取付板７に取付
けてある。プーリ取付板７は、基端が取付溝９の形成に
よって二叉状とされている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. The pulley unit 1 is of a type in which a pulley 4 is provided on the outer periphery of an outer ring 3 of a rolling bearing 2 and a shaft 5 serving also as an inner ring 5A is provided. The shaft 5 has a raceway groove 6 formed on the outer diameter surface near the distal end, and a seal contact groove 19 formed side by side with the base end side. The vicinity of the raceway groove 6 and the seal contact groove 19 is formed. Is the inner ring 5A of the bearing 2. The base end of the shaft 5 is shaped like a stepped shaft by projecting a small-diameter shaft portion 5b, and fitting the small-diameter shaft portion 5b into a pulley shaft hole 8 with a counterbore of the pulley mounting plate 7 and caulking the tip. Thus, the shaft 5 is mounted on the pulley mounting plate 7. The base end of the pulley mounting plate 7 is bifurcated by forming the mounting groove 9.
【０００８】プーリ４は、金属材料または樹脂材料から
なり、軸受外輪３よりも両側に広がる幅を有していて、
中央の内側へ突出した厚肉部分で軸受外輪３の外径面に
圧入により取付けられている。軸受２は、片側シール付
きの深溝玉軸受からなり、櫛状の保持器１０に保持され
た転動体であるボール１１を、内輪５Ａの軌道溝６と外
輪３の軌道溝１２の間に介在させてある。The pulley 4 is made of a metal material or a resin material, and has a width extending on both sides of the bearing outer ring 3.
A thick portion protruding inward at the center is attached to the outer diameter surface of the bearing outer ring 3 by press fitting. The bearing 2 is made of a deep groove ball bearing with a one-sided seal, and a ball 11 which is a rolling element held by a comb-shaped retainer 10 is interposed between the raceway groove 6 of the inner race 5A and the raceway groove 12 of the outer race 3. It is.
【０００９】外輪３の内径面には、軌道溝１２に対して
軸５の先端側および基端側にカバー取付用の溝１３およ
びシール溝１４が各々形成してあり、シール溝１４に環
状のシール１５を外径縁で嵌合させて取付けてある。シ
ール１５は、芯金にゴムまたは合成樹脂の弾性体を一体
化させた弾性接触シールであり、その内径縁のリップ部
を内輪５Ａのシール接触溝１９に接触させてある。シー
ル溝１４およびカバー取付用溝１３は、互いに同じ断面
形状の円周溝であり、外輪３は軸方向に沿う断面形状を
左右対称形状としてある。外輪３のカバー取付用の溝１
３には、円板状のカバー１６をその外周縁で嵌合させて
取付け、カバー１６で軸受２の内外輪５Ａ，３間の空間
および軸５の端面５ｃを覆っている。軸５の端面５ｃ
は、外輪２の幅面と同程度の軸方向位置か、または若干
引っ込んだ軸方向位置としてある。On the inner diameter surface of the outer ring 3, a cover mounting groove 13 and a seal groove 14 are formed on the distal end side and the proximal end side of the shaft 5 with respect to the raceway groove 12, respectively. The seal 15 is fitted and fitted on the outer diameter edge. The seal 15 is an elastic contact seal in which a rubber or a synthetic resin elastic body is integrated with a cored bar, and a lip portion of an inner peripheral edge thereof is brought into contact with a seal contact groove 19 of the inner race 5A. The seal groove 14 and the cover mounting groove 13 are circumferential grooves having the same cross-sectional shape, and the outer ring 3 has a symmetrical cross-sectional shape along the axial direction. Groove 1 for attaching cover of outer ring 3
3, a disk-shaped cover 16 is fitted and attached at the outer peripheral edge thereof, and the cover 16 covers the space between the inner and outer rings 5 </ b> A, 3 of the bearing 2 and the end face 5 c of the shaft 5. End face 5c of shaft 5
Is an axial position substantially equal to the width surface of the outer race 2 or an axial position slightly retracted.
【００１０】カバー１６は、リング状のカバー本体１６
Ａの中心に別体のキャップ１７を取付けたものである。
カバー本体１６Ａは、図２に拡大して示すように、芯金
１６Ａａとゴムまたは合成樹脂等のゴム状弾性体１６Ａ
ｂとを重なり状態に一体成形したものであり、外周部が
平板状となり、傾斜部を介して平板状の内周部に続く外
側へ凸となる断面形状とされている。カバー１６は、こ
の外周平板部と傾斜部との境界付近で、内輪５Ａの幅面
の外周縁ａ、換言すれば軸５の端面の外周縁に微小隙間
ｄ１を介して近接し、軸受２の内外輪５Ａ，３間の隙間
Ｓを略密封状態としている。キャップ１７は、全体がゴ
ムまたは合成樹脂等のゴム状弾性体からなり、外側へ膨
らむことで開口状態となる切欠または穴からなる微小通
気口（図示せず）が１個または複数個形成されている。
キャップ１７は、その外周縁に形成した厚肉部の切欠溝
でカバー本体１６Ａの内周縁に嵌合して取付けられてい
る。The cover 16 has a ring-shaped cover body 16.
A separate cap 17 is attached to the center of A.
As shown in an enlarged manner in FIG. 2, the cover main body 16A includes a core metal 16Aa and a rubber-like elastic body 16A such as rubber or synthetic resin.
b is integrally formed in an overlapping state, and has a cross-sectional shape in which the outer peripheral portion is formed into a flat plate, and the outer peripheral portion is formed to protrude outward following the inner circumferential portion of the flat plate through the inclined portion. The cover 16 is close to the outer peripheral edge a of the width surface of the inner race 5A, in other words, the outer peripheral edge of the end surface of the shaft 5 via the minute gap d1 near the boundary between the outer peripheral flat plate portion and the inclined portion. The gap S between the wheels 5A, 3 is substantially sealed. The cap 17 is entirely made of a rubber-like elastic material such as rubber or synthetic resin, and is formed with one or a plurality of minute vents (not shown) formed of cutouts or holes that are opened by expanding outward. I have.
The cap 17 is fitted and attached to the inner peripheral edge of the cover main body 16A by a notched groove of a thick portion formed on the outer peripheral edge thereof.
【００１１】図１に示すように、軸５の基端の外周には
リング状の詰め物１８が圧入によって取付けてある。詰
め物１８は、プーリ取付板７側の側面が開いた溝形断面
のものであり、プーリ取付板７に接して取付けられてプ
ーリ４の広がり部４ａ内に遊嵌し、広がり部４ａの内径
面に微小隙間ｄ２を介して近接している。詰め物１８の
材質は、鉄等の金属、または合成樹脂等とされる。As shown in FIG. 1, a ring-shaped filling 18 is mounted on the outer periphery of the base end of the shaft 5 by press fitting. The padding 18 has a groove-shaped cross section with an open side surface on the side of the pulley mounting plate 7, is mounted in contact with the pulley mounting plate 7, loosely fits in the expanded portion 4 a of the pulley 4, and has an inner diameter surface of the expanded portion 4 a. Is in close proximity via a minute gap d2. The material of the filling 18 is a metal such as iron or a synthetic resin.
【００１２】図３，図４は、このプーリユニット１を用
いた船外機エンジンの一例を示す。エンジン２０は、カ
バー２１で覆われていて、下方に延びるドライブ軸ケー
シング２２が接続してあり、その下端にスクリュー（図
示せず）が設けてある。エンジン２０はドライブ軸ケー
シング２２に設けられたブラケット２３を介し、船体の
船尾部２４に起倒回動可能に取付けられている。エンジ
ン２０の上面にはフライホイール２５の取付けられたク
ランクシャフト２６と、カムシャフト２７とが突出して
おり、クランクシャフト２６およびカムシャフト２７に
取付けられたクランクシャフトプーリ２８とカムシャフ
トプーリ２９との間に、タイミングベルト等のベルト３
０が掛装してある。このベルト３０の経路の途中に、こ
のプーリユニット１におけるプーリ４を、テンションプ
ーリとして押し付け状態に設けてある。プーリユニット
１は、その取付板７（図１）を取付溝９に挿通されたボ
ルト（図示せず）でエンジン２０のケーシングに取付け
ることにより、テンション調整のための位置または角度
調整を可能としてある。なお、エンジンカバー２１に
は、プーリユニット１およびベルト３０等で構成される
カムシャフト駆動機構を収容した部分の近傍に、給気口
（図示せず）が設けてある。FIGS. 3 and 4 show an example of an outboard motor engine using this pulley unit 1. FIG. The engine 20 is covered with a cover 21 and connected to a drive shaft casing 22 extending downward, and a screw (not shown) is provided at a lower end thereof. The engine 20 is mounted on a stern portion 24 of the hull via a bracket 23 provided on a drive shaft casing 22 so as to be able to turn up and down. A crankshaft 26 to which a flywheel 25 is attached and a camshaft 27 protrude from the upper surface of the engine 20, and a crankshaft pulley 28 and a camshaft pulley 29 attached to the crankshaft 26 and the camshaft 27 are protruded. And a belt 3 such as a timing belt
0 is mounted. In the middle of the path of the belt 30, the pulley 4 of the pulley unit 1 is provided in a pressed state as a tension pulley. The pulley unit 1 has its mounting plate 7 (FIG. 1) mounted on the casing of the engine 20 with bolts (not shown) inserted into the mounting grooves 9 to enable position or angle adjustment for tension adjustment. . The engine cover 21 is provided with an air supply port (not shown) in the vicinity of a portion where the camshaft drive mechanism including the pulley unit 1 and the belt 30 is accommodated.
【００１３】この構成のプーリユニット１によると、カ
バー１６は軸受２内の空間Ｓを蓋し、軸５の内輪５Ａと
なる部分に微小隙間ｄ１を介して近接するため、ラビリ
ンス効果等によって運転中に軸受内のグリースが飛散す
ることが防止される。そのためグリース補給の間隔を長
くすることができ、保守の手間が省ける。しかも、カバ
ー１６がプーリ４内への水の浸入防止と軸受２のグリー
ス飛散防止とを兼用するため、別々にカバーとシールを
設ける場合に比べて構造が簡単となり、低コストで済
む。また、カバー１６は、外輪３の内径面に形成された
溝１３に取付けるため、カバー取付用の溝１３として、
通常のシール付き軸受におけるシール溝を利用できる。
そのため、特別な溝加工をプーリ４や軸受外輪３に施す
ことなく、カバー１６の取付が行え、量産性に優れる。
軸受２のカバー１６と反対側のシール１５は、海水等が
プーリ４の裏側から軸受２内に進入することを防止し、
かつ軸受内部のグリースの飛散を防止する。この場合
に、軸５にリング状の詰め物１８を取付け、プーリ４の
広がり部分４ａの内側の隙間を微小隙間ｄ２としてある
ため、この部分でもラビリンスシール効果が得られ、プ
ーリ４内にカバー１６と反対側から水等が浸入すること
が防止される。また、カバー１６は、中心部にゴム状弾
性体からなるキャップ１７を設け、これに微小通気口
（図示せず）を設けてあるため、カバー１６の装着作業
時にその内側空間が密封状態となった後もカバー１６の
装着作業が進められることにより軸受２の内圧が上昇し
ても、前記微小通気穴から空気が逃げることができ、無
理な内圧の上昇が抑えられる。そのため、カバー１６の
装着が内圧で妨げられることが緩和されて装着作業が行
い易く、またカバー１６と反対側のシール１５に内圧の
上昇による位置ずれ等の悪影響を及ぼすことが防止され
る。According to the pulley unit 1 of this construction, the cover 16 covers the space S in the bearing 2 and comes close to the part to be the inner ring 5A of the shaft 5 via the minute gap d1, so that the cover 16 is operated by the labyrinth effect and the like. The grease in the bearing is prevented from scattering. Therefore, the interval of grease replenishment can be lengthened, and maintenance work can be omitted. In addition, since the cover 16 also serves to prevent water from entering the pulley 4 and to prevent grease from scattering on the bearing 2, the structure is simpler than in the case where a cover and a seal are separately provided, and the cost can be reduced. The cover 16 is attached to the groove 13 formed on the inner surface of the outer ring 3.
A seal groove in a normal sealed bearing can be used.
Therefore, the cover 16 can be attached without performing special groove processing on the pulley 4 or the bearing outer ring 3, and mass productivity is excellent.
The seal 15 on the opposite side of the cover 16 of the bearing 2 prevents seawater and the like from entering the bearing 2 from behind the pulley 4,
In addition, the grease inside the bearing is prevented from scattering. In this case, since a ring-shaped filling 18 is attached to the shaft 5 and the gap inside the expanded portion 4a of the pulley 4 is set as the minute gap d2, a labyrinth sealing effect is obtained even in this portion, and the cover 16 is provided inside the pulley 4. Water or the like is prevented from entering from the opposite side. Further, the cover 16 is provided with a cap 17 made of a rubber-like elastic body at the center thereof and provided with a minute ventilation port (not shown). Even after this, even if the internal pressure of the bearing 2 increases due to the mounting work of the cover 16 proceeding, air can escape from the minute ventilation holes, and an excessive increase in internal pressure is suppressed. Therefore, the mounting of the cover 16 is prevented from being hindered by the internal pressure, and the mounting operation is easily performed, and the seal 15 on the side opposite to the cover 16 is prevented from being adversely affected by a rise in the internal pressure, such as a displacement.
【００１４】なお、前記実施形態では軸５として内輪５
Ａを兼用するものを使用したが、軸に別体の内輪を取付
けるようにしても良い。また、プーリ４は、軸受２の外
輪３と同材質で一体に削り出しや成形等で形成したもの
であっても良い。In the above embodiment, the inner ring 5 is used as the shaft 5.
Although the one that also serves as A is used, a separate inner ring may be attached to the shaft. Further, the pulley 4 may be made of the same material as the outer race 3 of the bearing 2 and integrally formed by shaving or molding.
【００１５】[0015]
【発明の効果】この発明のプーリユニットは、内外輪間
の空間および軸の端面を覆うカバーを、軸受外輪の内径
面に形成された溝に外周縁を嵌合させて取付けたもので
あるため、プーリに溝加工を必要とせずにカバーの取付
けが行え、またシール溝をカバーの取付用溝に兼用でき
て量産性にも優れる。上記構成において、カバーの内面
と軸受内輪の幅面における外周縁との間に生じる隙間を
微小隙間とした場合は、軸受内への水等の浸入防止と共
に、軸受内の封入グリースの飛散防止効果が得られ、し
かも両効果がカバーで兼用できて簡単な構成で済む。カ
バーと反対側にシールを設け、シール溝とカバー取付用
の溝とを互いに幅方向に対称な断面形状とした場合は、
シール溝をカバー取付溝に兼用させることが一層容易と
なり、また軸受外輪の両面の方向性が無くなって組立作
業が簡単となる。プーリを軸受外輪よりも幅方向に広が
ったものとし、カバーと反対側でプーリの広がり部分の
内径面に微小隙間を介して近接するリング状の詰め物を
軸に取付けた場合は、プーリ内にカバーと反対側から水
等が浸入することが簡単な構成で防止できる。カバーの
中心部に別体のキャップを設け、このキャップに微小通
気口を設けた場合は、カバー装着時の軸受の内圧上昇が
緩和され、カバーの取付が容易になると共に、内圧上昇
によってシールに悪影響を及ぼすことが防止できる。According to the pulley unit of the present invention, the cover for covering the space between the inner and outer rings and the end face of the shaft is mounted by fitting the outer peripheral edge to the groove formed on the inner diameter surface of the bearing outer ring. In addition, the cover can be mounted without the need for groove processing on the pulley, and the seal groove can also be used as the cover mounting groove, which is excellent in mass productivity. In the above configuration, when the gap generated between the inner surface of the cover and the outer peripheral edge in the width surface of the bearing inner ring is a minute gap, the effect of preventing water and the like from entering the bearing and the effect of preventing the grease encapsulated in the bearing from scattering can be obtained. The effect can be obtained, and both effects can be shared by the cover, so that a simple configuration is sufficient. If a seal is provided on the opposite side of the cover and the seal groove and the cover mounting groove have a symmetrical cross-sectional shape in the width direction,
It is much easier to use the seal groove as the cover mounting groove, and the direction of the both surfaces of the bearing outer ring is eliminated, so that the assembling work is simplified. If the pulley is wider in the width direction than the outer ring of the bearing, and a ring-shaped padding that is close to the inner diameter surface of the expanded part of the pulley via a small gap on the opposite side to the cover is attached to the shaft, the cover is placed inside the pulley. Water and the like can be prevented from entering from the opposite side with a simple configuration. If a separate cap is provided at the center of the cover and a minute vent is provided in this cap, the internal pressure rise of the bearing when the cover is mounted is eased, and the cover is easily attached and the internal pressure rises to seal. A bad influence can be prevented.
【図１】この発明の一実施形態の断面図である。FIG. 1 is a sectional view of an embodiment of the present invention.
【図２】図１の部分拡大断面図である。FIG. 2 is a partially enlarged sectional view of FIG.
【図３】同プーリユニットを使用した船外機エンジンの
概略側面図である。FIG. 3 is a schematic side view of an outboard motor engine using the pulley unit.
【図４】そのプーリユニットを使用したカムシャフト駆
動機構の模式平面図である。FIG. 4 is a schematic plan view of a camshaft drive mechanism using the pulley unit.
１…プーリユニット ２…軸受 ３…外輪 ４…プーリ ５…軸 ５Ａ…内輪 ７…プーリ取付板 １３…カバー取付用の溝 １４…シール溝 １５…シール １６…カバー １７…キャップ １８…詰め物 ｄ１，ｄ２…微小隙間 Ｓ…空間 DESCRIPTION OF SYMBOLS 1 ... Pulley unit 2 ... Bearing 3 ... Outer ring 4 ... Pulley 5 ... Shaft 5A ... Inner ring 7 ... Pulley mounting plate 13 ... Cover mounting groove 14 ... Seal groove 15 ... Seal 16 ... Cover 17 ... Cap 18 ... Filling d1, d2 ... Small gap S ... Space
Claims (5)
け、前記軸受の内輪を兼用する軸または内輪が取付けら
れた軸を設けたプーリユニットにおいて、前記軸受の内
外輪間の空間および前記軸の端面を覆うカバーを設け、
このカバーは軸受外輪の内径面に形成された溝に外周縁
を嵌合させて取付けたプーリユニット。In a pulley unit provided with a pulley on an outer periphery of an outer ring of a rolling bearing and a shaft also serving as an inner ring of the bearing or a shaft having an inner ring attached thereto, a space between the inner and outer rings of the bearing and a shaft of the shaft are provided. Provide a cover to cover the end face,
This cover is a pulley unit in which the outer peripheral edge is fitted to a groove formed on the inner diameter surface of the bearing outer ring.
ける外周縁との間に生じる隙間を微小隙間とした請求項
１記載のプーリユニット。2. The pulley unit according to claim 1, wherein a gap generated between an inner surface of the cover and an outer peripheral edge of a width surface of the inner ring is a minute gap.
受幅面付近で内外輪間の空間を覆う環状のシールを設
け、このシールは軸受外輪の内径面に形成されたシール
溝に嵌合させて取付け、前記シール溝と前記カバー取付
用の溝とを互いに幅方向に対称な断面形状とした請求項
１または請求項２記載のプーリユニット。3. An annular seal for covering a space between the inner and outer rings near the bearing width surface opposite to the bearing width surface covered by the cover, the seal being fitted into a seal groove formed on the inner diameter surface of the bearing outer ring. 3. The pulley unit according to claim 1, wherein the seal groove and the cover mounting groove have a cross-sectional shape symmetrical to each other in a width direction.
がったものとし、前記カバーと反対側で、前記プーリの
広がり部分の内径面に微小隙間を介して近接するリング
状の詰め物を前記軸に取付けた請求項１ないし請求項４
のいずかに記載のプーリユニット。4. The ring-shaped padding which is close to the inner diameter surface of the expanded portion of the pulley on the side opposite to the cover with a minute gap between the pulley and the outer ring of the bearing. Claim 1 to Claim 4 attached to
Pulley unit according to any of the above.
体のゴム状弾性体からなるキャップを設け、このキャッ
プが外側へ膨らみ状態に弾性変形することによって開き
状態となる微小通気口を前記キャップに設けた請求項１
ないし請求項４のいずれかに記載のプーリユニット。5. A cap made of a rubber-like elastic body separate from the cover main body is provided at a center portion of the cover, and the minute air vent which is opened by elastically deforming the cap to an outwardly swelling state is provided. Claim 1 provided on the cap
The pulley unit according to claim 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19278296A JPH1019101A (en) | 1996-07-02 | 1996-07-02 | Pulley unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19278296A JPH1019101A (en) | 1996-07-02 | 1996-07-02 | Pulley unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1019101A true JPH1019101A (en) | 1998-01-23 |
Family
ID=16296918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19278296A Pending JPH1019101A (en) | 1996-07-02 | 1996-07-02 | Pulley unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1019101A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003262232A (en) * | 2002-03-08 | 2003-09-19 | Yamada Seisakusho Co Ltd | Sealing device of water pump bearing |
| WO2005019696A1 (en) * | 2003-07-24 | 2005-03-03 | Ina-Schaeffler Kg | Seal for an antifriction bearing |
| JP2009036283A (en) * | 2007-08-01 | 2009-02-19 | Nsk Ltd | Rolling bearing |
-
1996
- 1996-07-02 JP JP19278296A patent/JPH1019101A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003262232A (en) * | 2002-03-08 | 2003-09-19 | Yamada Seisakusho Co Ltd | Sealing device of water pump bearing |
| WO2005019696A1 (en) * | 2003-07-24 | 2005-03-03 | Ina-Schaeffler Kg | Seal for an antifriction bearing |
| US7435005B2 (en) | 2003-07-24 | 2008-10-14 | Schaeffler Kg | Seal for an antifriction bearing |
| JP2009036283A (en) * | 2007-08-01 | 2009-02-19 | Nsk Ltd | Rolling bearing |
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