WO2017154820A1 - Pulley unit with integral clutch - Google Patents
Pulley unit with integral clutch Download PDFInfo
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- WO2017154820A1 WO2017154820A1 PCT/JP2017/008725 JP2017008725W WO2017154820A1 WO 2017154820 A1 WO2017154820 A1 WO 2017154820A1 JP 2017008725 W JP2017008725 W JP 2017008725W WO 2017154820 A1 WO2017154820 A1 WO 2017154820A1
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- WIPO (PCT)
- Prior art keywords
- pulley
- side fitting
- dust cover
- outer diameter
- clutch
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/36—Pulleys
Definitions
- the present invention relates to a pulley unit with a built-in clutch used for the purpose of transmitting rotation of an engine crankshaft to an engine auxiliary machine such as an alternator, and more specifically, reliability for preventing intrusion of water, sludge, etc. into the interior under usage conditions Relates to a pulley unit with a built-in clutch.
- the pulley unit with a built-in clutch described above incorporates a one-way clutch in a pulley provided on the rotating shaft of an engine accessory.
- This clutch built-in pulley unit disengages the one-way clutch when the engine is suddenly decelerated and the pulley rotation speed drops below the rotation speed of the rotating shaft of the engine accessory that tries to continue to rotate due to inertia. As a result, the pulley rotates freely.
- this pulley unit with built-in clutch is exposed and attached to the outside below the vehicle body, the exposed end is covered with a dust cover as a measure to prevent foreign objects (such as muddy water and dust) from entering the interior. It has been broken.
- the pulley unit disclosed in Patent Document 1 is provided with a dust cover that covers the entire end face of the pulley on the open end side.
- the dust cover employed in the pulley unit of Patent Document 1 is a combination of a lid portion that covers the entire area of the end surface of the pulley and a cylindrical portion that fits on the outer periphery on the open end side of the pulley.
- the engaging claw provided on the periphery is engaged with the groove provided on the outer periphery of the pulley and fixed to the pulley.
- the dust cover is provided with a combination of a flat plate attached to the end surface on the open end side of the pulley and an engagement plate that enters the inner periphery on the open end side of the pulley. Yes.
- the dust cover employed in the pulley unit of Patent Document 2 is provided with a seal lip on the inner surface of the flat plate, and the engagement plate is engaged with an engagement groove formed on the inner peripheral surface on the open end side of the pulley. And fixed to the pulley. In this state, the seal lip is pressed against the end face of the pulley over the entire circumference, thereby sealing the inner space of the pulley.
- sealing with a dust cover is performed by a method in which a cylindrical portion connected to the outer periphery of the lid portion is brought into close contact with the outer periphery of the pulley.
- the entire end face of the pulley is covered with the dust cover, but since the tightening by the cylindrical portion is performed from the outer peripheral side toward the inner peripheral side, the cover of the cover due to the centrifugal force when the pulley rotates at high speed is used.
- the material of the dust cover is glass fiber reinforced PA (polyamide resin) or glass fiber reinforced phenol resin.
- the pulley unit of Patent Document 2 is not affected by centrifugal force when the pulley rotates at high speed because the dust cover is held on the inner diameter side of the pulley.
- the dust cover of this pulley unit does not cover the outer peripheral side of the end face of the pulley, and therefore, there is a point that the reliability of the seal is inferior to that of the pulley unit of Patent Document 1.
- the present invention has been made in view of the above, and an object of the present invention is to improve the reliability of preventing dust from entering by a dust cover for a pulley unit with a built-in clutch that cannot be avoided in an exposed environment.
- a pulley unit with a built-in clutch in which a one-way clutch and a bearing are interposed between a pulley and a rotary shaft inserted inside the pulley, the one end side end surface of the pulley
- the dust cover has an inner diameter side fitting portion that fits to the cylindrical inner diameter surface of the pulley and an outer diameter side fitting portion that fits to the cylindrical outer diameter surface of the pulley.
- Such a pulley unit with a built-in clutch may have the following forms 1) to 3).
- the outer diameter side fitting portion is fitted to the cylindrical outer diameter surface of the pulley without a tightening allowance, and the inner diameter side fitting portion is fitted to the cylindrical inner diameter surface of the pulley with a tightening allowance.
- the inner diameter side fitting portion and the outer diameter side fitting portion are both fitted to the cylindrical inner diameter surface and the cylindrical outer diameter surface of the pulley with a tightening margin.
- the pulley has an engagement groove on at least one of the cylindrical outer diameter surface and the cylindrical inner diameter surface, and the dust cover has an engagement claw that engages with the engagement groove.
- the dust cover can be made of a material such as resin, rubber, rubber-coated steel plate.
- the resin is preferably glass fiber reinforced PA (polyamide resin) with increased rigidity, glass fiber reinforced phenol resin, or the like.
- the pulley unit with a built-in clutch of the present invention is provided with a dust cover that fits both the cylindrical outer diameter surface and the cylindrical inner diameter surface of the pulley, and the outer diameter side fitting portion of the dust cover is formed on the cylindrical outer diameter surface of the pulley. Sealing between the inside and outside is performed at two places, the place where the fitting is performed and the place where the inner diameter side fitting portion of the dust cover is fitted to the cylindrical inner diameter surface of the pulley.
- the rigidity of the attachment portion with respect to the dust cover pulley is also ensured at the same time.
- the reliability with respect to centrifugal force when the pulley rotates at high speed is also improved, and measures such as increasing the thickness of each fitting portion on the outer diameter side and inner diameter side of the dust cover become unnecessary.
- FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is an expanded sectional view of the A section of FIG. It is sectional drawing which shows the other example of the pulley unit with a built-in clutch of this invention.
- the illustrated pulley unit 1 with a built-in clutch includes a hollow pulley 2, a rotary shaft (in the drawing, a pulley hub) 3 disposed inside the pulley 2, a pulley 2, and a rotary shaft 3. It consists of a one-way clutch 4 and two sets of bearings 5 interposed therebetween, and a dust cover 6 attached to the exposed end of the pulley 2.
- the pulley 2 has a double-row V-groove 2a on the outer periphery, and a power transmission belt (not shown) is hung on the V-groove 2a.
- the rotary shaft 3 has a large-diameter cam ring portion 3a on the outer periphery and a pair of cylindrical bearing surfaces 3b on both sides of the cam ring portion 3a. One direction is provided between the cam ring portion 3a and the inner diameter surface of the pulley 2.
- a clutch 4 is incorporated.
- the bearing 5 is incorporated between each of the pair of cylindrical bearing surfaces 3 b and the inner diameter surface of the pulley 2.
- the bearing 5 is a bearing with a single seal, and is incorporated in a direction in which the seal 5a faces outward.
- the one-way clutch 4 includes a steel outer ring 4 a press-fitted into the inner diameter surface of the pulley 2, a cage 4 b incorporated between the outer ring 4 a and the rotating shaft 3, This is a combination of a roller engaging element 4d and a spring 4e incorporated in a pocket 4c provided in the retainer 4b.
- a plurality of cam surfaces 4f are provided on the outer periphery of the cam ring portion 3a of the rotating shaft 3 at intervals in the circumferential direction, and a wedge space is formed between the cam surface 4f and the cylindrical inner surface of the outer ring 4a.
- the engaging element 4d is disposed on the inner side of the wedge space, and the engaging element 4d is biased toward the narrow portion of the wedge space by a spring 4e.
- the one-way clutch 4 When the rotation of the crankshaft of the engine is transmitted to the pulley 2 and the outer ring 4a integrated with the pulley 2 rotates in the direction of the arrow in FIG. 2, the one-way clutch 4 has the engagement element 4d in the narrow portion of the wedge space (the outer ring 4a Between the inner diameter surface of the cylinder and the cam surface 4f), the rotation of the outer ring 4a is transmitted to the rotating shaft 3 via the engaging element 4d, and the rotating shaft 3 rotates integrally with the pulley 2.
- the dust cover 6 is made of a resin such as glass fiber reinforced PA or glass fiber reinforced phenol resin, rubber, a rubber-coated steel plate, or the like.
- the dust cover 6 includes an inner diameter side fitting portion 6 b and an inner diameter side fitting portion 6 b on the outer periphery of a flat disc portion 6 a that covers the end surface on the open end side of the pulley unit.
- An annular connecting portion 6c extending outward in the radial direction from the outer end portion in the axial direction, and an outer diameter side fitting portion 6d extending inward in the axial direction from the outer end in the radial direction of the annular connecting portion 6c.
- the front end of the outer diameter side fitting portion 6d has an engaging claw 6e protruding inward in the radial direction.
- An engagement groove 2b is formed on the outer periphery of the pulley 2 on the dust cover mounting side.
- the illustrated inner diameter side fitting portion 6b of the dust cover 6 is in contact with the cylindrical inner diameter surface 2c of the pulley 2 with a tightening margin.
- the outer diameter side fitting portion 6d is in contact with the cylindrical outer diameter surface 2d of the pulley 2 with a tightening margin.
- the inner diameter side fitting portion 6b and the outer diameter side fitting portion 6d constitute a two-layer ring, the rigidity of the attachment portion of the dust cover with respect to the pulley is increased, and the reliability with respect to the centrifugal force when the pulley rotates at high speed Also improves.
- the disk portion 6a of the dust cover can be inserted inside the pulley 2, and the length of the rotating shaft 3 can be increased. It is possible to cope with a pulley unit having a specification that shortens the cost, and the cost can be easily reduced.
- outer diameter side fitting portion 6d of the dust cover 6 may be fitted to the cylindrical outer diameter surface 2d of the pulley 2 with no tightening allowance.
- the engaging groove and the engaging claw for holding the dust cover 6 in the mounting position may be provided in the fitting portion of the pulley 2 and the dust cover 6 on the pulley inner diameter side, and the pulley 2 and the dust cover 6 on the pulley inner diameter side. And it can also be provided in both fitting parts on the pulley outer diameter side.
- FIG. 4 shows a modification of the pulley unit with a built-in clutch according to the present invention.
- the pulley unit 1 with a built-in clutch shown in FIG. 4 is formed by processing the outer peripheral corner portion of the open end of the pulley 2 into a circular arc shape so that the annular joint portion 6c of the dust cover 6 and the outer diameter side fitting portion 6d intersect each other. Is different from the pulley unit 1 with a built-in clutch in FIG. 1 only in this point. Also in this structure, since the dust cover 6 is fitted to the pulley 2 at two locations on the inner diameter side and the outer diameter side of the pulley 2, the reliability of the seal is improved, the rigidity of the dust cover mounting portion is improved, and the disk portion of the dust cover is improved. It can be placed inside the pulley.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pulleys (AREA)
Abstract
Provided is a pulley unit with an integral clutch, which is configured such that a one-way clutch (4) and a bearing (5) are arranged between the pulley (2) and a rotating shaft (3) inserted inside the pulley, and which is provided with a dust cover (6) for covering the entire area of the end surface of one end of the pulley (2). The dust cover (6) has an inner diameter-side fitting section (6b) which fits to the circular cylindrical inner diameter surface (2c) of the pulley (2), and an outer diameter-side fitting section (6d) which fits to the circular cylindrical outer diameter surface (2d) of the pulley (2). The inner diameter-side fitting section (6b) and the outer diameter-side fitting section (6d) are interconnected with each other by an annular connection section (6c) located along the end surface of the pulley.
Description
この発明は、エンジンのクランクシャフトの回転をオルタネータなどのエンジン補機に伝達する目的で使用するクラッチ内蔵プーリユニット、詳しくは、使用状況下での水や汚泥などの内部への侵入防止の信頼性を高めたクラッチ内蔵プーリユニットに関する。
The present invention relates to a pulley unit with a built-in clutch used for the purpose of transmitting rotation of an engine crankshaft to an engine auxiliary machine such as an alternator, and more specifically, reliability for preventing intrusion of water, sludge, etc. into the interior under usage conditions Relates to a pulley unit with a built-in clutch.
首記のクラッチ内蔵プーリユニットは、エンジン補機の回転軸上に設けられるプーリ内に一方向クラッチを組み込んだものである。
The pulley unit with a built-in clutch described above incorporates a one-way clutch in a pulley provided on the rotating shaft of an engine accessory.
このクラッチ内蔵プーリユニットは、エンジンが急減速されてプーリの回転速度が惰性で回転し続けようとするエンジン補機の回転軸の回転速度よりも低下したときに、一方向クラッチの係合が解かれてプーリがフリー回転する。
This clutch built-in pulley unit disengages the one-way clutch when the engine is suddenly decelerated and the pulley rotation speed drops below the rotation speed of the rotating shaft of the engine accessory that tries to continue to rotate due to inertia. As a result, the pulley rotates freely.
これにより、クランクシャフトに取り付けられたプーリとエンジン補機の回転軸に取り付けられたプーリとの間に掛け渡されたベルトのプーリに対する滑りや張力増加が防止され、ベルトの摩耗や耐久性の低下が防止される。
This prevents slippage and increased tension on the pulley of the belt spanned between the pulley attached to the crankshaft and the pulley attached to the rotating shaft of the engine accessory, and reduces belt wear and durability. Is prevented.
そのクラッチ内蔵プーリユニットの従来技術として、例えば、下記特許文献１,２に記載されたものがある。
As a prior art of the clutch built-in pulley unit, for example, there are those described in Patent Documents 1 and 2 below.
このクラッチ内蔵プーリユニットは、車体の下方において外部に露出して取り付けられることから、異物（泥水や塵芥など）の内部への侵入防止策として、露出側の端部をダストカバーで覆うことが行われている。
Since this pulley unit with built-in clutch is exposed and attached to the outside below the vehicle body, the exposed end is covered with a dust cover as a measure to prevent foreign objects (such as muddy water and dust) from entering the interior. It has been broken.
前記特許文献１のプーリユニットでは、そのダストカバーとして、プーリの開放端側の端面の全域を覆うものが設けられている。
The pulley unit disclosed in Patent Document 1 is provided with a dust cover that covers the entire end face of the pulley on the open end side.
この特許文献１のプーリユニットに採用されたダストカバーは、プーリの端面の全域を覆う蓋部とプーリの開放端側の外周に嵌める筒状部とを組み合わせており、前記筒状部の先端内周に設けた係合爪をプーリの外周に設けられた溝に係合させてプーリに固定される。
The dust cover employed in the pulley unit of Patent Document 1 is a combination of a lid portion that covers the entire area of the end surface of the pulley and a cylindrical portion that fits on the outer periphery on the open end side of the pulley. The engaging claw provided on the periphery is engaged with the groove provided on the outer periphery of the pulley and fixed to the pulley.
また、前記特許文献２のプーリユニットでは、前記ダストカバーとして、プーリの開放端側の端面に添わせる平板とプーリの開放端側の内周に入り込ませる係合板とを組み合わせたものが設けられている。
In the pulley unit of Patent Document 2, the dust cover is provided with a combination of a flat plate attached to the end surface on the open end side of the pulley and an engagement plate that enters the inner periphery on the open end side of the pulley. Yes.
この特許文献２のプーリユニットに採用されたダストカバーは、前記平板の内面にシールリップを設けており、前記係合板をプーリの開放端側の内周面に加工された係合溝に係合させてプーリに固定される。この状態で前記シールリップがプーリの端面に全周において押し当てられて、プーリの内側空間の封止がなされる。
The dust cover employed in the pulley unit of Patent Document 2 is provided with a seal lip on the inner surface of the flat plate, and the engagement plate is engaged with an engagement groove formed on the inner peripheral surface on the open end side of the pulley. And fixed to the pulley. In this state, the seal lip is pressed against the end face of the pulley over the entire circumference, thereby sealing the inner space of the pulley.
前記特許文献１のプーリユニットは、ダストカバーによる封止が、蓋部の外周に連設された筒状部をプーリの外周に密着させる方法でなされる。
In the pulley unit of Patent Document 1, sealing with a dust cover is performed by a method in which a cylindrical portion connected to the outer periphery of the lid portion is brought into close contact with the outer periphery of the pulley.
この構造によれば、プーリの端面の全域がダストカバーによって覆われるが、筒状部による締め付けが外周側から内周側に向けて行われるため、プーリが高速回転するときの遠心力によるカバーの拡径を防止するために、カバーの剛性を向上させる必要があり、前記筒状部の肉厚増加などを招く不具合があった。
また、ダストカバーの材質はガラス繊維強化ＰＡ（ポリアミド樹脂）やガラス繊維強化フェノール樹脂などが使用されるが、使用雰囲気が高い場合、プーリ（鋼）とのはめあいが熱膨張率の違いにより緩くなる恐れがあり、初期はめあいの締め代を増加させる必要があるが、その場合、組立性の低下を招く課題があった。 According to this structure, the entire end face of the pulley is covered with the dust cover, but since the tightening by the cylindrical portion is performed from the outer peripheral side toward the inner peripheral side, the cover of the cover due to the centrifugal force when the pulley rotates at high speed is used. In order to prevent the diameter expansion, it is necessary to improve the rigidity of the cover, and there is a problem that causes an increase in the thickness of the cylindrical portion.
Also, the material of the dust cover is glass fiber reinforced PA (polyamide resin) or glass fiber reinforced phenol resin. When the usage atmosphere is high, the fit with the pulley (steel) becomes loose due to the difference in thermal expansion coefficient. There is a fear, and it is necessary to increase the tightening margin of the initial fit, but in that case, there is a problem that causes deterioration in assemblability.
また、ダストカバーの材質はガラス繊維強化ＰＡ（ポリアミド樹脂）やガラス繊維強化フェノール樹脂などが使用されるが、使用雰囲気が高い場合、プーリ（鋼）とのはめあいが熱膨張率の違いにより緩くなる恐れがあり、初期はめあいの締め代を増加させる必要があるが、その場合、組立性の低下を招く課題があった。 According to this structure, the entire end face of the pulley is covered with the dust cover, but since the tightening by the cylindrical portion is performed from the outer peripheral side toward the inner peripheral side, the cover of the cover due to the centrifugal force when the pulley rotates at high speed is used. In order to prevent the diameter expansion, it is necessary to improve the rigidity of the cover, and there is a problem that causes an increase in the thickness of the cylindrical portion.
Also, the material of the dust cover is glass fiber reinforced PA (polyamide resin) or glass fiber reinforced phenol resin. When the usage atmosphere is high, the fit with the pulley (steel) becomes loose due to the difference in thermal expansion coefficient. There is a fear, and it is necessary to increase the tightening margin of the initial fit, but in that case, there is a problem that causes deterioration in assemblability.
これに対し、前記特許文献２のプーリユニットは、ダストカバーの保持がプーリの内径側で行われることからプーリが高速回転するときの遠心力による影響を受けない。しかしながら、このプーリユニットのダストカバーではプーリの端面の外周側が覆われず、このため、特許文献１のプーリユニットに比べてシールの信頼性に劣る点があった。
On the other hand, the pulley unit of Patent Document 2 is not affected by centrifugal force when the pulley rotates at high speed because the dust cover is held on the inner diameter side of the pulley. However, the dust cover of this pulley unit does not cover the outer peripheral side of the end face of the pulley, and therefore, there is a point that the reliability of the seal is inferior to that of the pulley unit of Patent Document 1.
この発明は、上記に鑑みてなされたものであって、露出環境下での使用が避けられないクラッチ内蔵プーリユニットについて、ダストカバーによる異物侵入防止の信頼性を高めることを目的としている。
The present invention has been made in view of the above, and an object of the present invention is to improve the reliability of preventing dust from entering by a dust cover for a pulley unit with a built-in clutch that cannot be avoided in an exposed environment.
上記の課題を解決するため、この発明においては、プーリとそのプーリの内側に挿入される回転軸との間に一方向クラッチと軸受を介在したクラッチ内蔵プーリユニットであって、プーリの一端側端面の全域を覆うダストカバーを具備し、そのダストカバーが、前記プーリの円筒内径面に嵌合する内径側嵌合部と、プーリの円筒外径面に嵌合する外径側嵌合部を有し、その内径側嵌合部と外径側嵌合部がプーリの端面に添う環状つなぎ部を介して連設されたクラッチ内蔵プーリユニットを提供する。
In order to solve the above-mentioned problem, in the present invention, a pulley unit with a built-in clutch in which a one-way clutch and a bearing are interposed between a pulley and a rotary shaft inserted inside the pulley, the one end side end surface of the pulley The dust cover has an inner diameter side fitting portion that fits to the cylindrical inner diameter surface of the pulley and an outer diameter side fitting portion that fits to the cylindrical outer diameter surface of the pulley. Then, the clutch-equipped pulley unit is provided in which the inner diameter side fitting portion and the outer diameter side fitting portion are connected to each other via an annular connecting portion that follows the end face of the pulley.
かかるクラッチ内蔵プーリユニットは、下記１）～３）の形態のものが考えられる。
１）前記外径側嵌合部が前記プーリの円筒外径面に締代の無い状態で嵌合し、前記内径側嵌合部が締代をもって前記プーリの円筒内径面に嵌合するもの。
２）前記内径側嵌合部と前記外径側嵌合部が共に締代をもって前記プーリの円筒内径面と円筒外径面にそれぞれ嵌合するもの。
３）前記プーリが、前記円筒外径面と前記円筒内径面の少なくとも一方に係合溝を有し、前記ダストカバーが、前記係合溝に係止する係合爪を有するもの。 Such a pulley unit with a built-in clutch may have the following forms 1) to 3).
1) The outer diameter side fitting portion is fitted to the cylindrical outer diameter surface of the pulley without a tightening allowance, and the inner diameter side fitting portion is fitted to the cylindrical inner diameter surface of the pulley with a tightening allowance.
2) The inner diameter side fitting portion and the outer diameter side fitting portion are both fitted to the cylindrical inner diameter surface and the cylindrical outer diameter surface of the pulley with a tightening margin.
3) The pulley has an engagement groove on at least one of the cylindrical outer diameter surface and the cylindrical inner diameter surface, and the dust cover has an engagement claw that engages with the engagement groove.
１）前記外径側嵌合部が前記プーリの円筒外径面に締代の無い状態で嵌合し、前記内径側嵌合部が締代をもって前記プーリの円筒内径面に嵌合するもの。
２）前記内径側嵌合部と前記外径側嵌合部が共に締代をもって前記プーリの円筒内径面と円筒外径面にそれぞれ嵌合するもの。
３）前記プーリが、前記円筒外径面と前記円筒内径面の少なくとも一方に係合溝を有し、前記ダストカバーが、前記係合溝に係止する係合爪を有するもの。 Such a pulley unit with a built-in clutch may have the following forms 1) to 3).
1) The outer diameter side fitting portion is fitted to the cylindrical outer diameter surface of the pulley without a tightening allowance, and the inner diameter side fitting portion is fitted to the cylindrical inner diameter surface of the pulley with a tightening allowance.
2) The inner diameter side fitting portion and the outer diameter side fitting portion are both fitted to the cylindrical inner diameter surface and the cylindrical outer diameter surface of the pulley with a tightening margin.
3) The pulley has an engagement groove on at least one of the cylindrical outer diameter surface and the cylindrical inner diameter surface, and the dust cover has an engagement claw that engages with the engagement groove.
なお、前記ダストカバーは、樹脂、ゴム、ゴム被覆鋼板などの材料で構成することができる。樹脂は、剛性を高めたガラス繊維強化ＰＡ（ポリアミド樹脂）や、ガラス繊維強化フェノール樹脂などが好ましい。
The dust cover can be made of a material such as resin, rubber, rubber-coated steel plate. The resin is preferably glass fiber reinforced PA (polyamide resin) with increased rigidity, glass fiber reinforced phenol resin, or the like.
この発明のクラッチ内蔵プーリユニットは、プーリの円筒外径面と円筒内径面の双方に嵌合するダストカバーを設けており、そのダストカバーの外径側嵌合部がプーリの円筒外径面に嵌合した箇所と、ダストカバーの内径側嵌合部がプーリの円筒内径面に嵌合した箇所の２箇所において内外間のシールがなされる。
The pulley unit with a built-in clutch of the present invention is provided with a dust cover that fits both the cylindrical outer diameter surface and the cylindrical inner diameter surface of the pulley, and the outer diameter side fitting portion of the dust cover is formed on the cylindrical outer diameter surface of the pulley. Sealing between the inside and outside is performed at two places, the place where the fitting is performed and the place where the inner diameter side fitting portion of the dust cover is fitted to the cylindrical inner diameter surface of the pulley.
これにより、シール性能が向上し、プーリが高速回転するときの遠心力によるシール性の低下も起こらず、従来品に比べて泥水などの異物の侵入防止に関する信頼性が高まる。
This improves the sealing performance and does not cause a decrease in sealing performance due to centrifugal force when the pulley rotates at high speed, increasing the reliability of preventing intrusion of foreign matter such as muddy water compared to conventional products.
また、前記内径側嵌合部と外径側嵌合部が、前記環状つなぎ部を介して互いに連なって２層のリングを構成するため、ダストカバーのプーリに対する取り付け部の剛性確保も同時になされ、プーリが高速回転するときの遠心力に対する信頼性も向上してダストカバーの外径側と内径側の各嵌合部の肉厚を増加させるなどの対応が不要になる。
In addition, since the inner diameter side fitting portion and the outer diameter side fitting portion are connected to each other via the annular connecting portion to form a two-layer ring, the rigidity of the attachment portion with respect to the dust cover pulley is also ensured at the same time. The reliability with respect to centrifugal force when the pulley rotates at high speed is also improved, and measures such as increasing the thickness of each fitting portion on the outer diameter side and inner diameter side of the dust cover become unnecessary.
このほか、前記内径側嵌合部と外径側嵌合部が前記環状つなぎ部を介して連なる形状を採用することで、回転軸の長さを短かくする仕様のプーリユニットにも対応可能となり、低コスト化の効果も併せて期待できる。
In addition, by adopting a shape in which the inner diameter side fitting portion and the outer diameter side fitting portion are connected via the annular connecting portion, it becomes possible to cope with a pulley unit having a specification that shortens the length of the rotating shaft. Moreover, the effect of cost reduction can also be expected.
以下、この発明のクラッチ内蔵プーリユニットの実施の形態を添付図面の図１～図４に基づいて説明する。
Hereinafter, an embodiment of a pulley unit with a built-in clutch according to the present invention will be described with reference to FIGS. 1 to 4 of the accompanying drawings.
図１に示すように、例示のクラッチ内蔵プーリユニット１は、中空のプーリ２と、そのプーリ２の内側に配置される回転軸（図のそれはプーリハブ）３と、プーリ２と回転軸３との間に介在される一方向クラッチ４及び２組の軸受５と、プーリ２の露出側端部に装着されるダストカバー６とからなる。
As shown in FIG. 1, the illustrated pulley unit 1 with a built-in clutch includes a hollow pulley 2, a rotary shaft (in the drawing, a pulley hub) 3 disposed inside the pulley 2, a pulley 2, and a rotary shaft 3. It consists of a one-way clutch 4 and two sets of bearings 5 interposed therebetween, and a dust cover 6 attached to the exposed end of the pulley 2.
プーリ２は、外周に複列のＶ溝２ａを有し、そのＶ溝２ａに動力伝達用のベルト（図示せず）が掛けられる。
The pulley 2 has a double-row V-groove 2a on the outer periphery, and a power transmission belt (not shown) is hung on the V-groove 2a.
回転軸３は、外周に大径のカムリング部３ａと、そのカムリング部３ａの両側に一対の円筒軸受面３ｂを有しており、前記カムリング部３ａとプーリ２の内径面との間に一方向クラッチ４が組み込まれている。
The rotary shaft 3 has a large-diameter cam ring portion 3a on the outer periphery and a pair of cylindrical bearing surfaces 3b on both sides of the cam ring portion 3a. One direction is provided between the cam ring portion 3a and the inner diameter surface of the pulley 2. A clutch 4 is incorporated.
また、前記一対の円筒軸受面３ｂのそれぞれとプーリ２の内径面との間に前記軸受５が組み込まれている。その軸受５は、片シール付き軸受であり、シール５ａが外側になる向きに組み込まれている。
Further, the bearing 5 is incorporated between each of the pair of cylindrical bearing surfaces 3 b and the inner diameter surface of the pulley 2. The bearing 5 is a bearing with a single seal, and is incorporated in a direction in which the seal 5a faces outward.
一方向クラッチ４は、図１、図２に示すように、プーリ２の内径面に圧入された鋼製の外輪４ａと、その外輪４ａと回転軸３との間に組み込まれる保持器４ｂと、その保持器４ｂに設けられたポケット４ｃに組み込まれるローラの係合子４ｄ及びスプリング４ｅを組み合わせたものである。
As shown in FIGS. 1 and 2, the one-way clutch 4 includes a steel outer ring 4 a press-fitted into the inner diameter surface of the pulley 2, a cage 4 b incorporated between the outer ring 4 a and the rotating shaft 3, This is a combination of a roller engaging element 4d and a spring 4e incorporated in a pocket 4c provided in the retainer 4b.
回転軸３のカムリング部３ａの外周には、カム面４ｆが周方向に間隔をおいて複数設けられており、そのカム面４ｆと前記外輪４ａの円筒内径面との間に形成されたくさび空間に前記係合子４ｄが配置され、その係合子４ｄがスプリング４ｅによって前記くさび空間の狭小部に向けて付勢されている。
A plurality of cam surfaces 4f are provided on the outer periphery of the cam ring portion 3a of the rotating shaft 3 at intervals in the circumferential direction, and a wedge space is formed between the cam surface 4f and the cylindrical inner surface of the outer ring 4a. The engaging element 4d is disposed on the inner side of the wedge space, and the engaging element 4d is biased toward the narrow portion of the wedge space by a spring 4e.
この一方向クラッチ４は、エンジンのクランクシャフトの回転がプーリ２に伝達されてプーリ２と一体の外輪４ａが図２の矢印方向に回転すると、係合子４ｄがくさび空間の狭小部（外輪４ａの円筒内径面とカム面４ｆとの間）に噛み込まれ、外輪４ａの回転が係合子４ｄ経由で回転軸３に伝達されて回転軸３がプーリ２と一体になって回転する。
When the rotation of the crankshaft of the engine is transmitted to the pulley 2 and the outer ring 4a integrated with the pulley 2 rotates in the direction of the arrow in FIG. 2, the one-way clutch 4 has the engagement element 4d in the narrow portion of the wedge space (the outer ring 4a Between the inner diameter surface of the cylinder and the cam surface 4f), the rotation of the outer ring 4a is transmitted to the rotating shaft 3 via the engaging element 4d, and the rotating shaft 3 rotates integrally with the pulley 2.
そして、オルタネータの回転軸と一体回転する回転軸３の回転速度がエンジンの急減速などによってプーリ２の回転速度を上回ると、カム面４ｆに対する係合子４ｄの係合が解け、プーリ２がフリー回転してプーリ２と回転軸３との間における回転の伝達が遮断される。
When the rotation speed of the rotation shaft 3 that rotates integrally with the rotation shaft of the alternator exceeds the rotation speed of the pulley 2 due to the rapid deceleration of the engine or the like, the engagement of the engagement element 4d with the cam surface 4f is released and the pulley 2 rotates freely. Thus, transmission of rotation between the pulley 2 and the rotating shaft 3 is interrupted.
なお、この一方向クラッチは良く知られたものであるので、ここでのこれ以上の説明は省く。
Since this one-way clutch is well known, further explanation is omitted here.
ダストカバー６は、ガラス繊維強化ＰＡやガラス繊維強化フェノール樹脂などの樹脂、ゴム、ゴム被覆鋼板などを材料にして作られている。
The dust cover 6 is made of a resin such as glass fiber reinforced PA or glass fiber reinforced phenol resin, rubber, a rubber-coated steel plate, or the like.
このダストカバー６は、図１及び図３に示すように、プーリユニットの開放端側の端面を覆う平坦な円板部６ａの外周に内径側嵌合部６ｂと、その内径側嵌合部６ｂの軸方向外端部から径方向外向きに延び出す環状つなぎ部６ｃと、その環状つなぎ部６ｃの径方向外端から軸方向内向きに延び出す外径側嵌合部６ｄを備える。
As shown in FIGS. 1 and 3, the dust cover 6 includes an inner diameter side fitting portion 6 b and an inner diameter side fitting portion 6 b on the outer periphery of a flat disc portion 6 a that covers the end surface on the open end side of the pulley unit. An annular connecting portion 6c extending outward in the radial direction from the outer end portion in the axial direction, and an outer diameter side fitting portion 6d extending inward in the axial direction from the outer end in the radial direction of the annular connecting portion 6c.
また、外径側嵌合部６ｄの先端部に、径方向内向きに突出した係合爪６ｅを有する。
Also, the front end of the outer diameter side fitting portion 6d has an engaging claw 6e protruding inward in the radial direction.
プーリ２のダストカバー取り付け側の外周には、係合溝２ｂが形成されており、その係合溝２ｂに前記係合爪６ｅを係合させることで、プーリ２に対するダストカバー６の保持（そのダストカバー６の取り付け状態の保持）がなされるようにしている。
An engagement groove 2b is formed on the outer periphery of the pulley 2 on the dust cover mounting side. By engaging the engagement claw 6e with the engagement groove 2b, the dust cover 6 is held against the pulley 2 (there The dust cover 6 is kept attached).
図示のダストカバー６の内径側嵌合部６ｂは、プーリ２の円筒内径面２ｃに対して締代をもって接するものになっている。外径側嵌合部６ｄも、同様に、プーリ２の円筒外径面２ｄに対して締代をもって接するものになっている。
The illustrated inner diameter side fitting portion 6b of the dust cover 6 is in contact with the cylindrical inner diameter surface 2c of the pulley 2 with a tightening margin. Similarly, the outer diameter side fitting portion 6d is in contact with the cylindrical outer diameter surface 2d of the pulley 2 with a tightening margin.
これにより、プーリユニットの片端における内外間のシールが２箇所においてなされ、プーリ２の内部への異物の侵入防止が安定してなされる。
Thus, sealing between the inside and outside at one end of the pulley unit is performed at two places, and foreign matter can be prevented from entering the pulley 2 stably.
また、内径側嵌合部６ｂと外径側嵌合部６ｄが、２層のリングを構成するため、ダストカバーのプーリに対する取り付け部の剛性が高まり、プーリが高速回転するときの遠心力に対する信頼性も向上する。
Further, since the inner diameter side fitting portion 6b and the outer diameter side fitting portion 6d constitute a two-layer ring, the rigidity of the attachment portion of the dust cover with respect to the pulley is increased, and the reliability with respect to the centrifugal force when the pulley rotates at high speed Also improves.
さらに、前記内径側嵌合部６ｂと外径側嵌合部６ｄが互いに連なる形状であるので、ダストカバーの円板部６ａをプーリ２の内側に入り込ませることができ、回転軸３の長さを短かくする仕様のプーリユニットにも対応可能となってコスト低減も図り易くなる。
Further, since the inner diameter side fitting portion 6b and the outer diameter side fitting portion 6d are connected to each other, the disk portion 6a of the dust cover can be inserted inside the pulley 2, and the length of the rotating shaft 3 can be increased. It is possible to cope with a pulley unit having a specification that shortens the cost, and the cost can be easily reduced.
なお、ダストカバー６の外径側嵌合部６ｄは、プーリ２の円筒外径面２ｄに対して締代の無い状態で嵌合させても構わない。
It should be noted that the outer diameter side fitting portion 6d of the dust cover 6 may be fitted to the cylindrical outer diameter surface 2d of the pulley 2 with no tightening allowance.
その構造でも、外径側嵌合部６ｄとプーリ２の円筒外径面２ｄが嵌合した箇所において固形異物の侵入が阻止され、また、内径側嵌合部６ｂとプーリ２の円筒内径面２ｃが嵌合した箇所において水や泥水の侵入が防止されるので、従来品に勝るシールの信頼性が得られる。
Even in this structure, solid foreign matter is prevented from entering at the place where the outer diameter side fitting portion 6d and the cylindrical outer diameter surface 2d of the pulley 2 are fitted, and the inner diameter side fitting portion 6b and the cylindrical inner diameter surface 2c of the pulley 2 are also prevented. Since the intrusion of water or muddy water is prevented at the point where the fittings are fitted, the seal reliability superior to that of the conventional product can be obtained.
なお、ダストカバー６を装着位置に保持する係合溝と係合爪は、プーリ２とダストカバー６のプーリ内径側における嵌め合い部に設けてもよく、プーリ２とダストカバー６のプーリ内径側及びプーリ外径側の双方の嵌め合い部に設けることもできる。
The engaging groove and the engaging claw for holding the dust cover 6 in the mounting position may be provided in the fitting portion of the pulley 2 and the dust cover 6 on the pulley inner diameter side, and the pulley 2 and the dust cover 6 on the pulley inner diameter side. And it can also be provided in both fitting parts on the pulley outer diameter side.
図４は、この発明のクラッチ内蔵プーリユニットの変形例である。この図４のクラッチ内蔵プーリユニット１は、プーリ２の開放側端部の外周コーナ部を円弧面状に加工してダストカバー６の環状つなぎ部６ｃと外径側嵌合部６ｄが交差する箇所を前記プーリ２の開放側端部の外周コーナ部の形状に対応させた形状にしており、この点のみが図１のクラッチ内蔵プーリユニット１と異なる。
この構造も、ダストカバー６がプーリ２の内径側と外径側の２箇所でプーリ２と嵌合するので、シールの信頼性向上やダストカバー取り付け部の剛性向上、ダストカバーの円板部のプーリ内部への入り込み配置などが可能である。 FIG. 4 shows a modification of the pulley unit with a built-in clutch according to the present invention. Thepulley unit 1 with a built-in clutch shown in FIG. 4 is formed by processing the outer peripheral corner portion of the open end of the pulley 2 into a circular arc shape so that the annular joint portion 6c of the dust cover 6 and the outer diameter side fitting portion 6d intersect each other. Is different from the pulley unit 1 with a built-in clutch in FIG. 1 only in this point.
Also in this structure, since thedust cover 6 is fitted to the pulley 2 at two locations on the inner diameter side and the outer diameter side of the pulley 2, the reliability of the seal is improved, the rigidity of the dust cover mounting portion is improved, and the disk portion of the dust cover is improved. It can be placed inside the pulley.
この構造も、ダストカバー６がプーリ２の内径側と外径側の２箇所でプーリ２と嵌合するので、シールの信頼性向上やダストカバー取り付け部の剛性向上、ダストカバーの円板部のプーリ内部への入り込み配置などが可能である。 FIG. 4 shows a modification of the pulley unit with a built-in clutch according to the present invention. The
Also in this structure, since the
１ クラッチ内蔵プーリユニット
２ プーリ
２ａ Ｖ溝
２ｂ 係合溝
２ｃ 円筒内径面
２ｄ 円筒外径面
３ 回転軸
３ａ カムリング部
３ｂ 円筒軸受面
４ 一方向クラッチ
４ａ 外輪
４ｂ 保持器
４ｃ ポケット
４ｄ 係合子
４ｅ スプリング
４ｆ カム面
５ 軸受
５ａ シール
６ ダストカバー
６ａ 円板部
６ｂ 内径側嵌合部
６ｃ 環状つなぎ部
６ｄ 外径側嵌合部
６ｅ 係合爪 DESCRIPTION OFSYMBOLS 1 Pulley unit with built-in clutch 2 Pulley 2a V groove 2b Engagement groove 2c Cylindrical inner diameter surface 2d Cylindrical outer diameter surface 3 Rotating shaft 3a Cam ring part 3b Cylindrical bearing surface 4 One-way clutch 4a Outer ring 4b Cage 4c Pocket 4d Engagement element 4e Spring 4f Cam surface 5 Bearing 5a Seal 6 Dust cover 6a Disk part 6b Inner diameter side fitting part 6c Annular connecting part 6d Outer diameter side fitting part 6e Engaging claw
２ プーリ
２ａ Ｖ溝
２ｂ 係合溝
２ｃ 円筒内径面
２ｄ 円筒外径面
３ 回転軸
３ａ カムリング部
３ｂ 円筒軸受面
４ 一方向クラッチ
４ａ 外輪
４ｂ 保持器
４ｃ ポケット
４ｄ 係合子
４ｅ スプリング
４ｆ カム面
５ 軸受
５ａ シール
６ ダストカバー
６ａ 円板部
６ｂ 内径側嵌合部
６ｃ 環状つなぎ部
６ｄ 外径側嵌合部
６ｅ 係合爪 DESCRIPTION OF
Claims (7)
- プーリ（２）とそのプーリ（２）の内側に挿入される回転軸（３）との間に一方向クラッチ（４）と軸受（５）を介在したクラッチ内蔵プーリユニットであって、
プーリ（２）の一端側端面の全域を覆うダストカバー（６）を具備し、
そのダストカバー（６）が、前記プーリ（２）の円筒内径面（２ｃ）に嵌合する内径側嵌合部（６ｂ）と、円筒外径面（２ｄ）に嵌合する外径側嵌合部（６ｄ）を有し、その内径側嵌合部（６ｂ）と外径側嵌合部（６ｄ）がプーリ（２）の端面に添う環状つなぎ部（６ｃ）を介して連設されたクラッチ内蔵プーリユニット。 A pulley unit with a built-in clutch in which a one-way clutch (4) and a bearing (5) are interposed between a pulley (2) and a rotating shaft (3) inserted inside the pulley (2),
A dust cover (6) covering the entire end face of the pulley (2);
The dust cover (6) has an inner diameter side fitting portion (6b) that fits to the cylindrical inner diameter surface (2c) of the pulley (2), and an outer diameter side fitting that fits to the cylindrical outer diameter surface (2d). Clutch having a portion (6d), the inner diameter side fitting portion (6b) and the outer diameter side fitting portion (6d) being continuously provided via an annular connecting portion (6c) that follows the end face of the pulley (2) Built-in pulley unit. - 前記外径側嵌合部（６ｄ）が前記プーリ（２）の円筒外径面（２ｄ）に締代の無い状態で嵌合し、前記内径側嵌合部（６ｂ）が前記プーリ（２）の円筒内径面（２ｃ）に締代をもって嵌合するように構成された請求項１に記載のクラッチ内蔵プーリユニット。 The outer diameter side fitting portion (6d) is fitted to the cylindrical outer diameter surface (2d) of the pulley (2) without tightening, and the inner diameter side fitting portion (6b) is fitted to the pulley (2). The pulley unit with a built-in clutch according to claim 1, wherein the pulley inner unit is configured to be fitted to the cylindrical inner surface (2c) with a tightening margin.
- 前記内径側嵌合部（６ｂ）と前記外径側嵌合部（６ｄ）が共に締代をもって前記プーリ（２）の円筒内径面（２ｃ）と円筒外径面（２ｄ）にそれぞれ嵌合するように構成された請求項１に記載のクラッチ内蔵プーリユニット。 Both the inner diameter side fitting portion (6b) and the outer diameter side fitting portion (6d) are fitted to the cylindrical inner diameter surface (2c) and the cylindrical outer diameter surface (2d) of the pulley (2) with a tightening margin. The pulley unit with a built-in clutch according to claim 1 configured as described above.
- 前記プーリ（２）が、前記円筒内径面（２ｃ）と前記円筒外径面（２ｄ）の少なくとも一方に係合溝（２ｂ）を有し、前記ダストカバー（６）が、前記係合溝（２ｂ）に係止する係合爪（６ｅ）を有する請求項１～３のいずれかに記載のクラッチ内蔵プーリユニット。 The pulley (2) has an engagement groove (2b) on at least one of the cylindrical inner diameter surface (2c) and the cylindrical outer diameter surface (2d), and the dust cover (6) has the engagement groove ( The pulley unit with a built-in clutch according to any one of claims 1 to 3, further comprising an engaging claw (6e) that is locked to 2b).
- 前記ダストカバーの材質が、樹脂である請求項１～４のいずれかに記載のクラッチ内蔵プーリユニット。 The clutch built-in pulley unit according to any one of claims 1 to 4, wherein a material of the dust cover is resin.
- 前記ダストカバーの材質が、ガラス繊維強化ポリアミド樹脂又はガラス繊維強化フェノール樹脂である請求項５に記載のクラッチ内蔵プーリユニット。 The pulley unit with a built-in clutch according to claim 5, wherein the material of the dust cover is glass fiber reinforced polyamide resin or glass fiber reinforced phenol resin.
- 前記ダストカバーの材質が、ゴム又はゴム被覆鋼板である請求項１～４のいずれかに記載のクラッチ内蔵プーリユニット。 The clutch built-in pulley unit according to any one of claims 1 to 4, wherein a material of the dust cover is rubber or a rubber-coated steel plate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-046750 | 2016-03-10 | ||
| JP2016046750A JP2017161006A (en) | 2016-03-10 | 2016-03-10 | Clutch built-in pulley unit |
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| Publication Number | Publication Date |
|---|---|
| WO2017154820A1 true WO2017154820A1 (en) | 2017-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2017/008725 WO2017154820A1 (en) | 2016-03-10 | 2017-03-06 | Pulley unit with integral clutch |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2017161006A (en) |
| WO (1) | WO2017154820A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005133917A (en) * | 2003-10-31 | 2005-05-26 | Fukoku Co Ltd | Isolation pulley |
| JP2006234008A (en) * | 2005-02-22 | 2006-09-07 | Nsk Ltd | Pulley device with built-in one-way clutch |
| JP2014228011A (en) * | 2013-05-17 | 2014-12-08 | 株式会社ジェイテクト | Pulley unit and alternator |
-
2016
- 2016-03-10 JP JP2016046750A patent/JP2017161006A/en active Pending
-
2017
- 2017-03-06 WO PCT/JP2017/008725 patent/WO2017154820A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005133917A (en) * | 2003-10-31 | 2005-05-26 | Fukoku Co Ltd | Isolation pulley |
| JP2006234008A (en) * | 2005-02-22 | 2006-09-07 | Nsk Ltd | Pulley device with built-in one-way clutch |
| JP2014228011A (en) * | 2013-05-17 | 2014-12-08 | 株式会社ジェイテクト | Pulley unit and alternator |
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| Publication number | Publication date |
|---|---|
| JP2017161006A (en) | 2017-09-14 |
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