JP3765650B2 - Pulley unit for driving engine accessories - Google Patents

Pulley unit for driving engine accessories Download PDF

Info

Publication number
JP3765650B2
JP3765650B2 JP23264397A JP23264397A JP3765650B2 JP 3765650 B2 JP3765650 B2 JP 3765650B2 JP 23264397 A JP23264397 A JP 23264397A JP 23264397 A JP23264397 A JP 23264397A JP 3765650 B2 JP3765650 B2 JP 3765650B2
Authority
JP
Japan
Prior art keywords
pulley unit
pulley
outer ring
inner ring
attached
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 - Lifetime
Application number
JP23264397A
Other languages
Japanese (ja)
Other versions
JPH1163171A (en
Inventor
雅彦 里田
保 児玉
博光 近藤
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 JP23264397A priority Critical patent/JP3765650B2/en
Publication of JPH1163171A publication Critical patent/JPH1163171A/en
Application granted granted Critical
Publication of JP3765650B2 publication Critical patent/JP3765650B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F16C33/723—Shaft end sealing means, e.g. cup-shaped caps or covers
    • 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
    • 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
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/001—Integrated brakes or clutches for stopping or coupling the relatively movable parts
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
    • F16D41/069—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by pivoting or rocking, e.g. sprags
    • F16D41/07—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by pivoting or rocking, e.g. sprags between two cylindrical surfaces
    • 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
    • F16C2361/43—Clutches, e.g. disengaging bearing
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pulleys (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Sealing Of Bearings (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は、エンジンを駆動源とするオルタネータ等のエンジン補機の回転軸上に取付けられるプーリユニットに関するものである。
【０００２】
【従来の技術】
一般に、内燃機関においては、爆発工程時に駆動エネルギが生じ、他の工程で駆動力が発生しないため、クランクシャフトには１回転中に角速度変動が生じる。
【０００３】
このため、図４に示すように、角速度が微小変動するクランクシャフト３０の回転をベルト伝動装置３１を介して一定の速度で回転しようとする慣性力の大きいオルタネータ等のエンジン補機３２を駆動すると、クランクシャフト３０の角速度変動に起因して、エンジン補機３２の回転軸３３上に取付けられたプーリ２とベルト３５との間でスリップが生じ、ベルト３５が摩耗し易い。
【０００４】
上記のような問題点を解決するためエンジン補機の回転軸上に取付けられるプーリの内部に一方向クラッチを組込んだプーリユニットを本件出願人は既に提案している。
【０００５】
上記プーリユニットは、図５および図６に示すように、エンジン補機３２の回転軸３３に取付けられる内輪１とプーリ２の内側に取付けられた外輪３との間に、内輪１と外輪３とを相対的に回転自在に支持する転動体４と、スプラグから成る係合子５とを周方向に交互に組込んでいる。
【０００６】
上記プーリユニットをエンジン補機３２の回転軸３３に取付けた状態において、そのプーリユニットのプーリ２に図４に示すクランクシャフト３０の回転を伝達すると、クランクシャフト３０の角速度増加時、係合子５が外輪３の内径面および内輪１の外径面に係合してクラッチが成立し、プーリ２と共に回転する外輪３の回転が係合子５を介して内輪１に伝達され、エンジン補機３２の回転軸が回転される。
【０００７】
また、クランクシャフト３０の角速度が低下し、エンジン補機３２の回転軸３３の回転がプーリ２の回転速度より速くなると、係合子５の外輪３内径面および内輪１外径面に対する係合が解除され回転軸３３がフリー回転する。
【０００８】
このため、プーリ２とベルト間においてスリップが生じず、ベルト寿命の低下を抑制することができる。
【０００９】
【発明が解決しようとする課題】
ところで、上記プーリユニットにおいては、内輪１と外輪３の両端部間に一対のシール６ａ、６ｂを取付けて両輪１、３間に充填されたグリース等の潤滑剤の漏洩を防止し、かつ雨水や塵埃が軸受内部に侵入するのを防止しているが、シール６ａ、６ｂは外部に露出しているため、雨水や塵埃の影響を受け易く、また、小石の衝突によってシール６ａ、６ｂが変形することがあり、良好な潤滑特性を長期にわたって維持するうえにおいて改善すべき点が残されている。
【００１０】
この発明の課題は、良好な潤滑特性を長期にわたって維持することができるエンジン補機駆動用のプーリユニットを提供することである。
【００１１】
【課題を解決するための手段】
上記の課題を解決するために、この発明においては、エンジン補機の回転軸に取付けられる内輪とプーリの内側に取付けられた外輪との間に、内輪と外輪を相対的に回転自在に支持する転動体と、外輪の一方向の回転のみを内輪に伝達する係合子とを組込み、上記内輪の外周面と外輪の内径面における両端部間を一対のシールによって密封したエンジン補機駆動用のプーリユニットにおいて、前記一対のシールのうち、プーリユニットの組付け状態で前面側に配置される一方のシールを内輪内径面に取付けた前面カバーで覆った構成を採用している。
【００１２】
また、他方のシールを後面カバーで覆った構成を採用している。
【００１４】
また、前面カバーを環状とし、その内径部に円筒部を設け、この円筒部を内輪の内径面に圧入してもよい。
【００１５】
【発明の実施の形態】
以下、この発明の実施の形態を図１乃至図３に基づいて説明する。
【００１６】
図１は、この発明の第１の実施の形態を示す。図示のように、プーリユニットＡは、図６において述べたプーリユニットと同様に、エンジン補機の回転軸に取付けられる内輪１と、プーリ２と、そのプーリ２の内径面に圧入による手段等を介して取付けられた外輪３とを有し、上記内輪１と外輪３との間に、内輪１と外輪３とを相対的に回転自在に支持する転動体４および係合子５が組込まれている。
【００１７】
転動体４および係合子５は、図６に示すプーリユニットと同様に周方向に交互に配置されているが、配置はこれに限定されるものではない。例えば、周方向に並ぶ転動体４と、周方向に並ぶ係合子５とを複列に設けてもよい。また、複列の転動体４間に単列の係合子５を設けてもよい。
【００１８】
係合子５は図６に示すプーリユニットと同様にスプラグが採用されている。この係合子５は、プーリ２と共に外輪３が一方向に回転したとき、外輪３の内径面および内輪１の外径面に係合して、外輪３の回転を内輪１に伝え、内輪１の回転速度が外輪３の回転速度を上回ると係合が係合解除されるようになっている。
【００１９】
外輪３の内径面両端部には一対のシール６ａ、６ｂの内径部に設けられたシールリップ７が内輪１の外径面と接触して外輪３と内輪１間を密封しており、上記シール６ａ、６ｂによって両輪１、３間に充填された潤滑材の漏洩が防止され、かつ塵埃が軸受内部に侵入するのが防止されている。
【００２０】
上記の構成から成るプーリユニットＡを図５に示すエンジン補機３２の回転軸３３に取付けた状態において、前面側に配置される一方のシール６ａは、外輪３の内径面端部に取付けられる前面カバー８で保護される。
【００２１】
前面カバー８は円筒部９を外径部に有し、その円筒部９は外輪３の内径面一端部に嵌合され、上記円筒部９の外周に設けられた突出部１０と外輪の内径面端部に形成された係合溝１１の係合によって前面カバー８は取付け状態に保持されている。
【００２２】
上記のように、外輪３の内径面端部に前面カバー８を取付けたことにより、その前面カバー８によって一方のシール６ａを保護することができる。このため、一方のシール６ａに雨水や泥水が付着してシール６ａが劣化し、あるいは小石等の衝突によって変形したり破損するのを防止することができ、良好な潤滑特性を長期にわたって維持することができる。
【００２３】
図２は、この発明の第２の実施の形態を示す。この第２の実施の形態と先に述べた第１の実施の形態とは、後面カバー１２によって他方のシール６ｂを覆った点のみが相違する。
【００２４】
ここで、後面カバー１２は環状を有し、その内径部には円筒部１３が設けられ、上記円筒部１３を内輪１の内径面他端部に嵌合し、その円筒部１３の外周面に形成された突出部１４と内輪１の内径面他端部に設けられた係合溝１５との係合によって後面カバー１２を取付け状態に保持している。その取付けによって、後面カバー１２の外周に設けられたフランジ１６と外輪１の内径面他端部間にラビリンス１７が設けられる。
【００２５】
上記のように、内輪１の他端部に後面カバー１２を取付けたことにより、その後面カバー１２と前面カバー８とによって一対のシール６ａ、６ｂが保護されるため、雨水や泥水の付着によるシール６ａ、６ｂの劣化、および小石の衝突によるシール６ａ、６ｂの変形や破損を防止し、良好な潤滑性をより長期的にわたって維持することができる。
【００２６】
図３は、この発明の第３の実施の形態を示す。この実施の形態と先に述べた第１の実施の形態とは前面カバー８の形状および取付けの手段が相違する。
【００２７】
前面カバー８は環状を有し、その内径部には円筒部１８が設けられ、上記円筒部１８を内輪１の内径面一端部に圧入して前面カバー８を取付け状態に保持し、その前面カバー８の外径部に設けたフランジ１９と外輪３の内径面一端部間にラビリンス２０を形成している。
【００２８】
上記第３の実施の形態におけるプーリユニットにおいても第１の実施の形態のプーリユニットと同様の作用効果を奏する。
【００２９】
なお、図では省略したが、一方のシール６ａを覆う前面カバー８をプーリ２の内径面端部に取付けてもよい。
【００３０】
【発明の効果】
以上のように、この発明においては、プーリユニットの取付け状態において、前面側に配置される一方のシールを前面カバーで覆ったことにより、シールの保護を図り、良好な潤滑特性を長期にわたって維持することができる。
【００３１】
また、プーリユニットの取付け状態において後面側に配置される他方のシールを後面カバーで覆ったことにより、その後面カバーの保護を図り、良好な潤滑特性をより長期にわたって維持することができる。
【図面の簡単な説明】
【図１】この発明に係るプーリユニットの第１の実施の形態を示す断面図
【図２】この発明に係るプーリユニットの第２の実施の形態を示す断面図
【図３】この発明に係るプーリユニットの第３の実施の形態を示す断面図
【図４】従来のプーリユニットの使用例を示す概略図
【図５】従来のプーリユニットの使用状態を示す断面図
【図６】同上のプーリユニットの一部分を示す縦断側面図
【符号の説明】
１ 内輪
２ プーリ
３ 外輪
４ 転動体
５ 係合子
６ａ、６ｂ シール
８ 前面カバー
１２ 後面カバー[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pulley unit that is mounted on a rotating shaft of an engine accessory such as an alternator that uses an engine as a drive source.
[0002]
[Prior art]
In general, in an internal combustion engine, driving energy is generated during an explosion process, and no driving force is generated in other processes. Therefore, the crankshaft undergoes an angular speed fluctuation during one rotation.
[0003]
For this reason, as shown in FIG. 4, when an engine accessory 32 such as an alternator having a large inertia force is driven to rotate the crankshaft 30 whose angular velocity slightly fluctuates through the belt transmission 31 at a constant speed. Due to the angular speed fluctuation of the crankshaft 30, slip occurs between the pulley 2 mounted on the rotating shaft 33 of the engine accessory 32 and the belt 35, and the belt 35 is likely to be worn.
[0004]
In order to solve the above problems, the present applicant has already proposed a pulley unit in which a one-way clutch is incorporated in a pulley mounted on a rotating shaft of an engine accessory.
[0005]
As shown in FIGS. 5 and 6, the pulley unit includes an inner ring 1 and an outer ring 3 between an inner ring 1 attached to a rotating shaft 33 of an engine accessory 32 and an outer ring 3 attached to the inside of the pulley 2. Are rotatably incorporated in the circumferential direction, and rolling elements 4 that relatively rotatably support the rotating body 4 and engagement elements 5 made of sprags.
[0006]
When the rotation of the crankshaft 30 shown in FIG. 4 is transmitted to the pulley 2 of the pulley unit in a state where the pulley unit is attached to the rotation shaft 33 of the engine accessory 32, the engagement element 5 is released when the angular speed of the crankshaft 30 increases. A clutch is established by engaging the inner diameter surface of the outer ring 3 and the outer diameter surface of the inner ring 1, and the rotation of the outer ring 3 that rotates together with the pulley 2 is transmitted to the inner ring 1 through the engagement element 5, and the rotation of the engine accessory 32. The shaft is rotated.
[0007]
Further, when the angular speed of the crankshaft 30 decreases and the rotation of the rotation shaft 33 of the engine auxiliary machine 32 becomes faster than the rotation speed of the pulley 2, the engagement element 5 is disengaged from the inner diameter surface of the outer ring 3 and the outer diameter surface of the inner ring 1. Then, the rotary shaft 33 rotates freely.
[0008]
For this reason, slip does not occur between the pulley 2 and the belt, and a reduction in belt life can be suppressed.
[0009]
[Problems to be solved by the invention]
By the way, in the pulley unit, a pair of seals 6a and 6b are attached between both ends of the inner ring 1 and the outer ring 3 to prevent leakage of lubricant such as grease filled between the two wheels 1 and 3, and rainwater and Dust is prevented from entering the inside of the bearing. However, since the seals 6a and 6b are exposed to the outside, they are easily affected by rainwater and dust, and the seals 6a and 6b are deformed by the collision of pebbles. There are still points to be improved in maintaining good lubrication characteristics over a long period of time.
[0010]
An object of the present invention is to provide a pulley unit for driving an engine accessory capable of maintaining good lubrication characteristics over a long period of time.
[0011]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, an inner ring and an outer ring are relatively rotatably supported between an inner ring attached to a rotating shaft of an engine accessory and an outer ring attached to the inside of a pulley. A pulley for driving an engine accessory in which a rolling element and an engagement element that transmits only rotation in one direction of the outer ring to the inner ring are incorporated, and a gap between both ends of the outer peripheral surface of the inner ring and the inner diameter surface of the outer ring is sealed with a pair of seals. In the unit, a configuration is adopted in which one of the pair of seals arranged on the front side in the assembled state of the pulley unit is covered with a front cover attached to the inner ring inner diameter surface .
[0012]
Moreover, the structure which covered the other seal | sticker with the back cover is employ | adopted.
[0014]
Alternatively, the front cover may be annular, a cylindrical portion may be provided on the inner diameter portion, and the cylindrical portion may be press-fitted into the inner diameter surface of the inner ring.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.
[0016]
FIG. 1 shows a first embodiment of the present invention. As shown in the figure, the pulley unit A has an inner ring 1 attached to the rotating shaft of the engine auxiliary machine, a pulley 2 and a means for press-fitting the inner surface of the pulley 2 as in the pulley unit described in FIG. A rolling element 4 and an engagement element 5 are installed between the inner ring 1 and the outer ring 3 so as to relatively rotatably support the inner ring 1 and the outer ring 3. .
[0017]
Although the rolling elements 4 and the engagement elements 5 are alternately arranged in the circumferential direction similarly to the pulley unit shown in FIG. 6, the arrangement is not limited to this. For example, the rolling elements 4 arranged in the circumferential direction and the engagement elements 5 arranged in the circumferential direction may be provided in a double row. Further, a single-row engagement element 5 may be provided between the double-row rolling elements 4.
[0018]
The engaging element 5 employs a sprag as in the pulley unit shown in FIG. When the outer ring 3 together with the pulley 2 rotates in one direction, the engagement element 5 engages with the inner diameter surface of the outer ring 3 and the outer diameter surface of the inner ring 1 to transmit the rotation of the outer ring 3 to the inner ring 1. When the rotational speed exceeds the rotational speed of the outer ring 3, the engagement is disengaged.
[0019]
Seal lips 7 provided at the inner diameter portions of the pair of seals 6a and 6b are in contact with the outer diameter surface of the inner ring 1 at both ends of the inner diameter surface of the outer ring 3 to seal between the outer ring 3 and the inner ring 1. 6a and 6b prevent leakage of the lubricant filled between the two wheels 1 and 3, and prevent dust from entering the bearing.
[0020]
In a state where the pulley unit A having the above-described configuration is attached to the rotating shaft 33 of the engine accessory 32 shown in FIG. 5, one seal 6 a disposed on the front side is a front surface attached to the inner surface end of the outer ring 3. It is protected by a cover 8.
[0021]
The front cover 8 has a cylindrical portion 9 on the outer diameter portion, and the cylindrical portion 9 is fitted to one end portion of the inner diameter surface of the outer ring 3, and the protruding portion 10 provided on the outer periphery of the cylindrical portion 9 and the inner diameter surface of the outer ring. The front cover 8 is held in the attached state by the engagement of the engagement groove 11 formed at the end.
[0022]
As described above, by attaching the front cover 8 to the inner diameter end portion of the outer ring 3, one seal 6 a can be protected by the front cover 8. For this reason, it is possible to prevent rainwater or muddy water from adhering to one of the seals 6a to deteriorate the seal 6a, or to be deformed or damaged by a collision with pebbles or the like, and to maintain good lubrication characteristics over a long period of time. Can do.
[0023]
FIG. 2 shows a second embodiment of the present invention. This second embodiment is different from the first embodiment described above only in that the other seal 6b is covered by the rear cover 12.
[0024]
Here, the rear cover 12 has an annular shape, and a cylindrical portion 13 is provided at the inner diameter portion thereof. The cylindrical portion 13 is fitted to the other end portion of the inner diameter surface of the inner ring 1, and the outer peripheral surface of the cylindrical portion 13 is fitted. The rear cover 12 is held in an attached state by engagement between the formed protrusion 14 and an engagement groove 15 provided at the other end of the inner diameter surface of the inner ring 1. By the attachment, the labyrinth 17 is provided between the flange 16 provided on the outer periphery of the rear cover 12 and the other end portion of the inner diameter surface of the outer ring 1.
[0025]
As described above, since the rear cover 12 is attached to the other end portion of the inner ring 1, the pair of seals 6a and 6b is protected by the rear cover 12 and the front cover 8, so that the seal due to the attachment of rainwater or muddy water. The deterioration of 6a, 6b and the deformation and breakage of the seals 6a, 6b due to the collision of pebbles can be prevented, and good lubricity can be maintained over a longer period.
[0026]
FIG. 3 shows a third embodiment of the present invention. This embodiment is different from the first embodiment described above in the shape and attachment means of the front cover 8.
[0027]
The front cover 8 has an annular shape, and a cylindrical portion 18 is provided on the inner diameter portion thereof. The cylindrical portion 18 is press-fitted into one end portion of the inner diameter surface of the inner ring 1 to hold the front cover 8 in an attached state. A labyrinth 20 is formed between a flange 19 provided on the outer diameter portion 8 and one end portion of the inner diameter surface of the outer ring 3.
[0028]
The pulley unit in the third embodiment also has the same effects as the pulley unit in the first embodiment.
[0029]
Although omitted in the figure, a front cover 8 that covers one of the seals 6a may be attached to the inner surface end of the pulley 2.
[0030]
【The invention's effect】
As described above, according to the present invention, when the pulley unit is attached, one seal disposed on the front side is covered with the front cover, thereby protecting the seal and maintaining good lubrication characteristics over a long period of time. be able to.
[0031]
Further, by covering the other seal arranged on the rear surface side with the rear cover in the pulley unit attached state, the rear cover can be protected, and good lubrication characteristics can be maintained for a longer period.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of a pulley unit according to the present invention. FIG. 2 is a cross-sectional view showing a second embodiment of a pulley unit according to the present invention. FIG. 4 is a cross-sectional view showing a third embodiment of a pulley unit. FIG. 4 is a schematic view showing an example of use of a conventional pulley unit. FIG. 5 is a cross-sectional view showing a use state of a conventional pulley unit. Vertical side view showing a part of the unit [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner ring 2 Pulley 3 Outer ring 4 Rolling element 5 Engagement element 6a, 6b Seal 8 Front cover 12 Rear cover

Claims (2)

エンジン補機の回転軸に取付けられる内輪とプーリの内側に取付けられた外輪との間に、内輪と外輪を相対的に回転自在に支持する転動体と、外輪の一方向の回転のみを内輪に伝達する係合子とを組込み、上記内輪の外周面と外輪の内径面における両端部間を一対のシールによって密封したエンジン補機駆動用のプーリユニットにおいて、前記一対のシールのうち、プーリユニットの組付け状態で前面側に配置される一方のシールを内輪内径面に取付けた前面カバーで覆ったことを特徴とするエンジン補機駆動用のプーリユニット。Between the inner ring attached to the rotating shaft of the engine accessory and the outer ring attached to the inside of the pulley, a rolling element that supports the inner ring and the outer ring relatively rotatably, and only rotation of the outer ring in one direction is used as the inner ring. In the pulley unit for driving an engine accessory in which the outer peripheral surface of the inner ring and the inner diameter surface of the outer ring are sealed with a pair of seals, a pulley unit set of the pair of seals is incorporated. A pulley unit for driving an engine accessory, wherein one of the seals disposed on the front side in the attached state is covered with a front cover attached to an inner ring inner surface . 前記他方のシールを後面カバーで覆ったことを特徴とする請求項１に記載のエンジン補機駆動用のプーリユニット。  The pulley unit for driving an engine accessory according to claim 1, wherein the other seal is covered with a rear cover.
JP23264397A 1997-08-28 1997-08-28 Pulley unit for driving engine accessories Expired - Lifetime JP3765650B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23264397A JP3765650B2 (en) 1997-08-28 1997-08-28 Pulley unit for driving engine accessories

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23264397A JP3765650B2 (en) 1997-08-28 1997-08-28 Pulley unit for driving engine accessories

Publications (2)

Publication Number Publication Date
JPH1163171A JPH1163171A (en) 1999-03-05
JP3765650B2 true JP3765650B2 (en) 2006-04-12

Family

ID=16942518

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23264397A Expired - Lifetime JP3765650B2 (en) 1997-08-28 1997-08-28 Pulley unit for driving engine accessories

Country Status (1)

Country Link
JP (1) JP3765650B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012172827A (en) * 2011-02-24 2012-09-10 Nsk Ltd Pulley device

Also Published As

Publication number Publication date
JPH1163171A (en) 1999-03-05

Similar Documents

Publication Publication Date Title
US6394250B1 (en) Alternator pulley unit with a built-in one-way clutch
JPS62278315A (en) Bearing device
JPH07317807A (en) Pulley unit
JP2003207034A (en) Over-running clutch pulley with composite seal member
JP3765650B2 (en) Pulley unit for driving engine accessories
JP2001027261A (en) One-way clutch assembly
KR101431095B1 (en) A driving wheel bearing device
JP2006144812A (en) Sealing device
JP4158556B2 (en) Power transmission device
JP3724506B2 (en) One-way clutch built-in pulley device
KR101857193B1 (en) Driving Wheel Bearing
JP4123836B2 (en) Pulley unit sealing structure
JPH10184853A (en) Roller clutch built-in type pulley
JP3785316B2 (en) Pulley unit mounting structure
JP4899343B2 (en) One-way clutch built-in pulley device
JP2008267553A (en) Pulley unit
JP2003042168A (en) Power transfer device
JPH1163170A (en) Roller clutch built-in pulley device for alternator
JP2005321022A (en) One-way clutch
JP2005009576A (en) One-way clutch built-in type rotary machine device with pulley
JP2013024293A (en) Pulley unit with built-in clutch
JP4617610B2 (en) Pulley unit
JP2000240766A (en) Pulley device with built-in one-way clutch
JP2017166534A (en) Pulley unit
JP2005009583A (en) One-way clutch built-in type pulley device

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20050829

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20050906

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20051104

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: 20060110

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20060124

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100203

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100203

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110203

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120203

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120203

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130203

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140203

Year of fee payment: 8

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

EXPY Cancellation because of completion of term