JP5189447B2 - Bearing with resin pulley - Google Patents

Bearing with resin pulley Download PDF

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Publication number
JP5189447B2
JP5189447B2 JP2008247911A JP2008247911A JP5189447B2 JP 5189447 B2 JP5189447 B2 JP 5189447B2 JP 2008247911 A JP2008247911 A JP 2008247911A JP 2008247911 A JP2008247911 A JP 2008247911A JP 5189447 B2 JP5189447 B2 JP 5189447B2
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outer ring
resin pulley
bearing
resin
heat sink
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JP2010078073A (en
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克典 峰野
吾朗 中尾
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NTN Corp
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NTN Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/067—Fixing them in a housing
    • 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
    • F16C37/00—Cooling of bearings
    • F16C37/007—Cooling of bearings of rolling 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
    • 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
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/30—Material joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/63—Gears with belts and pulleys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/07—Fixing them on the shaft or housing with interposition of an element
    • F16C35/077—Fixing them on the shaft or housing with interposition of an element between housing and outer race ring

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

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the heat radiation performance of a rolling bearing while preventing a resin-made pulley from creeping. <P>SOLUTION: A peripheral groove 17 to be filled with resin of the resin-made pulley 18 is provided in the outer peripheral part of an outer ring 13. Both end faces of the inner peripheral part of the resin-made pulley 18 are positioned on an inner side in the axial direction more than both end faces of the outer ring 13, and a metallic heat radiation plate 21 is fitted into the end of the outer ring 13. This heat radiation plate 21 is constituted by forming an inner ring coming into contact with the end face of the outer ring 13 like an inward facing flange from an outer ring 22 along the end of the outer ring 13. Area of exposed end and end face of the outer ring 13 to be exposed is increased by the outer ring part 22 of the heat radiation plate 21 fitted into the end of the exposed outer ring 13 and the inner ring 23 coming into contact with the end face of the outer ring 13 to improve the heat radiation performance of the rolling bearing 11. It is also possible to prevent the resin-made pulley 18 from creeping due to the friction resistance caused between the side face of the peripheral groove 17 of the outer ring 13 and the resin in the peripheral groove 17. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

この発明は、転がり軸受の外輪の外径部に、樹脂プーリ部材を射出成形により一体成形した樹脂プーリ付き軸受に関する。   The present invention relates to a bearing with a resin pulley in which a resin pulley member is integrally formed by injection molding on an outer diameter portion of an outer ring of a rolling bearing.

転がり軸受の外輪の外径部に樹脂プーリ部材を一体化した樹脂プーリ付き軸受は、射出成形によって、樹脂プーリ部材のボス部が外輪の両端面を抱え込むように、外輪の外径部に樹脂プーリ部材を一体化し、樹脂プーリ部材を軸方向でずれ止めしたものが多い。このような樹脂プーリ付き軸受では、軸受の温度上昇に伴う金属と樹脂の熱膨張率の差によって、外輪と樹脂プーリ部材との結合強度が低下し、樹脂プーリ部材が周方向へ相対回転するクリープが生じることがある。   A bearing with a resin pulley in which a resin pulley member is integrated with an outer diameter portion of an outer ring of a rolling bearing is a resin pulley attached to the outer diameter portion of the outer ring so that the boss portion of the resin pulley member holds both end faces of the outer ring by injection molding. In many cases, the members are integrated and the resin pulley member is prevented from shifting in the axial direction. In such a bearing with a resin pulley, the coupling strength between the outer ring and the resin pulley member decreases due to the difference in the coefficient of thermal expansion between the metal and the resin as the bearing temperature rises, and the creep in which the resin pulley member relatively rotates in the circumferential direction. May occur.

このため、クリープの発生を防止する手段を備えた樹脂プーリ付き軸受が提案されている。この樹脂プーリ付き軸受は、外輪の外径部の全周に軸受中心に対して偏心する偏心溝が形成されたものである（特許文献１参照）。   For this reason, a bearing with a resin pulley provided with means for preventing the occurrence of creep has been proposed. This bearing with a resin pulley is formed with an eccentric groove that is eccentric with respect to the center of the bearing on the entire circumference of the outer diameter portion of the outer ring (see Patent Document 1).

外輪の外径部に偏心溝を形成することにより、外輪の外径部に樹脂プーリを一体成形すると、偏心溝に樹脂プーリの樹脂が食い込む。その食い込み部と偏心溝との係合によって樹脂プーリの外輪に対するクリープを防止することができる。   By forming an eccentric groove in the outer diameter portion of the outer ring, when the resin pulley is integrally formed in the outer diameter portion of the outer ring, the resin of the resin pulley bites into the eccentric groove. The engagement between the biting portion and the eccentric groove can prevent creep of the resin pulley with respect to the outer ring.

特開２００８−１５１２５８号公報JP 2008-151258 A

しかし、特許文献１に記載された樹脂プーリ付き軸受は、樹脂プーリのボス部が外輪の両端面を抱え込むように、外輪の外径部に樹脂プーリが一体化されている。このため、外輪の周りが金属よりも熱伝導率が低い樹脂で覆われて放熱性が悪く、蓄熱により軸受温度が高くなる問題がある。また、軸受温度が高くなると、これと接触する樹脂の強度が低下するので、前述したクリープ防止手段の効果も低下する。   However, in the bearing with a resin pulley described in Patent Document 1, the resin pulley is integrated with the outer diameter portion of the outer ring so that the boss portion of the resin pulley holds both end faces of the outer ring. For this reason, there is a problem that the periphery of the outer ring is covered with a resin having a thermal conductivity lower than that of the metal and the heat dissipation is poor, and the bearing temperature increases due to heat storage. Further, since the strength of the resin that comes into contact with the bearing temperature increases as the bearing temperature increases, the effect of the creep prevention means described above also decreases.

そこで、この発明の課題は、樹脂プーリのクリープを防止しつつ、転がり軸受の放熱性を高めることにある。   Therefore, an object of the present invention is to improve heat dissipation of the rolling bearing while preventing creep of the resin pulley.

前記課題を解決するために、この発明の樹脂プーリ付き軸受は、転がり軸受と、この転がり軸受の外周に射出成形により一体化された樹脂プーリとからなる樹脂プーリ付き軸受において、外輪の外周部に周溝が設けられ、前記樹脂プーリの樹脂が前記周溝に埋め込まれ、前記樹脂プーリの内周部の両端面が前記外輪の両端面よりも軸方向内側に位置し、前記外輪の端部に嵌合される金属製の放熱板を備え、この放熱板は、前記外輪の端部に沿う外環部と、この外環部から内向きフランジ状に形成され前記外輪の端面に接触する内環部とを有する構成を採用したのである。   In order to solve the above-mentioned problems, a bearing with a resin pulley according to the present invention is a bearing with a resin pulley comprising a rolling bearing and a resin pulley integrated with the outer periphery of the rolling bearing by injection molding. A circumferential groove is provided, the resin of the resin pulley is embedded in the circumferential groove, both end surfaces of the inner peripheral portion of the resin pulley are located on the inner side in the axial direction from both end surfaces of the outer ring, and the end of the outer ring The heat sink includes a metal heat sink to be fitted, and the heat sink includes an outer ring portion extending along an end portion of the outer ring, and an inner ring formed in an inward flange shape from the outer ring portion and in contact with the end surface of the outer ring. The structure which has a part was employ | adopted.

この構成では、樹脂プーリの内周部の両端面が前記外輪の両端面よりも軸方向内側に位置しているため、外輪の端面および外径面の両端部が露出する。露出する外輪の端部に嵌合する放熱板の外環部と、外輪の端面に接触する内環部とによって、露出する外輪の端部および端面の露出面積を大きくさせることができる。このため、転がり軸受で発生した熱の放熱面積が大きくなり、単に外輪の端面および外径面の両端部を露出させる場合よりも、放熱性を向上させることができる。   In this configuration, since both end surfaces of the inner peripheral portion of the resin pulley are positioned on the inner side in the axial direction than both end surfaces of the outer ring, the end surface of the outer ring and both end portions of the outer diameter surface are exposed. The exposed area of the exposed end portion of the outer ring and the end surface can be increased by the outer ring portion of the heat radiating plate fitted to the exposed end portion of the outer ring and the inner ring portion contacting the end surface of the outer ring. For this reason, the heat dissipation area of the heat generated by the rolling bearing is increased, and the heat dissipation can be improved as compared with the case where the end surfaces of the outer ring and the both end portions of the outer diameter surface are simply exposed.

また、樹脂プーリが外輪の外周に射出成形により一体化されると、その樹脂プーリを形成する樹脂が外輪の外径面の周溝に埋め込まれ、樹脂プーリと周溝の側面とが接触する。この接触により、樹脂プーリの外輪に対する径方向接触領域が確保される。径方向接触領域が確保されると、樹脂プーリのクリープに対する耐力が確保され、樹脂プーリのクリープを防止することができる。   When the resin pulley is integrated with the outer periphery of the outer ring by injection molding, the resin forming the resin pulley is embedded in the circumferential groove on the outer diameter surface of the outer ring, and the resin pulley and the side surface of the circumferential groove come into contact with each other. This contact secures a radial contact area of the resin pulley with respect to the outer ring. When the radial contact area is secured, the yield strength of the resin pulley against creep is secured, and the resin pulley can be prevented from creeping.

この構成において、前記放熱板の内環部がアキシアル断面の形状を波形とした湾曲部を備えた構成を採用すると、転がり軸受で発生した熱を湾曲部に伝えて、放熱させることができる。このため、放熱板の内環部の放熱面積が大きくなり、転がり軸受の高温化を抑えることができる。なお、アキシアル断面の形状とはアキシアル平面を切断面としたときの形状を意味する。   In this configuration, when a configuration in which the inner ring portion of the heat radiating plate includes a curved portion having a wave shape in the axial cross section is adopted, heat generated in the rolling bearing can be transmitted to the curved portion to be radiated. For this reason, the heat dissipation area of the inner ring part of the heat sink increases, and the temperature rise of the rolling bearing can be suppressed. The shape of the axial cross section means a shape when the axial plane is a cut surface.

放熱板の内環部の湾曲部に係る構成において、前記湾曲部が前記転がり軸受のシールを覆う位置に径方向内向きに形成されたものとすることができる。このようにすると、外輪の端面に放熱板を嵌合することで、湾曲部が転がり軸受のシールを覆うので、外的要因によってシールが損傷することを防止することができる。   The structure which concerns on the curved part of the inner ring part of a heat sink WHEREIN: The said curved part shall be formed in the radial direction inward in the position which covers the seal | sticker of the said rolling bearing. If it does in this way, since a curved part covers the seal | sticker of a rolling bearing by fitting a heat sink to the end surface of an outer ring | wheel, it can prevent that a seal | sticker is damaged by an external factor.

また、放熱板の内環部の放熱面積を大きくするために、前記内環部に前記外輪の周方向に沿う溝が形成されたものとすることができる。   Moreover, in order to enlarge the heat radiation area of the inner ring part of a heat sink, the groove | channel along the circumferential direction of the said outer ring | wheel can be formed in the said inner ring part.

前記放熱板の内環部に係る構成において、前記転がり軸受を取り付ける締結部材を備え、この締結部材は内輪の内周に嵌合され、前記内輪の端面に接触する鍔を有し、前記内環部に軸方向外向きに延びる筒状部を備え、この筒状部と前記締結部材の鍔との間でラビリンスシールが形成された構成を採用することができる。   The structure relating to the inner ring portion of the heat sink includes a fastening member to which the rolling bearing is attached, the fastening member being fitted to the inner periphery of the inner ring, and having a flange that contacts the end surface of the inner ring, It is possible to adopt a configuration in which a cylindrical portion extending outward in the axial direction is provided in the portion, and a labyrinth seal is formed between the cylindrical portion and the flange of the fastening member.

転がり軸受の内周に締結部材が嵌合されることにより、放熱板の内環部の筒状部と締結部材の鍔との間でラビリンスシールが形成される。このため、締結部材と放熱板の内環部の筒状部とは、転がり軸受のシールを覆うダストカバーとなり、転がり軸受の内部に埃や泥水などの異物が浸入することを防止することができる。   By fitting the fastening member to the inner periphery of the rolling bearing, a labyrinth seal is formed between the cylindrical portion of the inner ring portion of the heat sink and the flange of the fastening member. For this reason, a fastening member and the cylindrical part of the inner ring part of a heat sink become a dust cover which covers the seal of a rolling bearing, and can prevent foreign matters, such as dust and muddy water, from entering the inside of the rolling bearing. .

また、前記樹脂プーリの内周部が前記放熱板の外環部のうち軸方向内側部分を埋め込んだ状態で、前記外輪の外周に一体化された構成を採用することができる。   Moreover, the structure integrated with the outer periphery of the said outer ring | wheel can be employ | adopted in the state which the inner peripheral part of the said resin pulley embedded the axial direction inner side part among the outer ring parts of the said heat sink.

この構成によると、放熱板の外環部の軸方向内側部分が樹脂プーリの内周部に埋め込まれているので、転がり軸受で発生した熱は、外輪から放熱板の外環部または樹脂プーリに伝わる。放熱板の外環部は樹脂プーリを形成する樹脂よりも熱伝導性が高い。このため、外輪の熱は、樹脂プーリよりも放熱板の外環部に伝わり易く、この外環部から内環部に移動する。その結果、樹脂プーリに蓄熱され難くなり、転がり軸受の高温化を抑えることができる。   According to this configuration, since the axially inner portion of the outer ring portion of the heat sink is embedded in the inner peripheral portion of the resin pulley, the heat generated in the rolling bearing is transferred from the outer ring to the outer ring portion of the heat sink or the resin pulley. It is transmitted. The outer ring portion of the heat sink has higher thermal conductivity than the resin forming the resin pulley. For this reason, the heat of the outer ring is more easily transmitted to the outer ring part of the heat sink than the resin pulley, and moves from the outer ring part to the inner ring part. As a result, it becomes difficult to store heat in the resin pulley, and the high temperature of the rolling bearing can be suppressed.

前記外輪の外周部に設けられた周溝の代わりに、またはその周溝とともに、前記放熱板の外環部のうち前記樹脂プーリとの接触部分に前記樹脂プーリの内周部が埋め込まれる係合部を備えた構成を採用することができる。   Engagement in which the inner peripheral portion of the resin pulley is embedded in the contact portion with the resin pulley in the outer ring portion of the heat sink instead of or along with the peripheral groove provided in the outer peripheral portion of the outer ring The structure provided with the part can be adopted.

外輪の外周部に設けられた周溝の代わりに、放熱板の外周部が係合部を備えたものとすると、この係合部に樹脂プーリの内周部が係合して、クリープに対する耐力を確保することができる。
また、樹脂プーリの外周部に大きなトルクが作用する場合など、より大きなクリープに対する耐力が必要な場合、外輪の外周部に設けられた周溝とともに、放熱板の外周部に係合部を備えたものとすればよい。 Assuming that the outer peripheral part of the heat sink has an engaging part instead of the peripheral groove provided on the outer peripheral part of the outer ring, the inner peripheral part of the resin pulley is engaged with this engaging part, and the resistance against creep Can be secured.
In addition, when a greater resistance to creep is required, such as when a large torque acts on the outer peripheral portion of the resin pulley, an engaging portion is provided on the outer peripheral portion of the heat sink together with a peripheral groove provided on the outer peripheral portion of the outer ring. It should be.

放熱板の外環部に備えた係合部としては、凹部やスリットなど樹脂プーリが埋め込まれ、樹脂との間で係合し、耐クリープ性が発揮され得る形状であればよく、例えば、前記外環部に形成された軸方向の切り込みであるもの、または前記外環部に形成された透孔であるものとすることができる。   As the engagement portion provided in the outer ring portion of the heat sink, a resin pulley such as a concave portion or a slit may be embedded, and it may be engaged with the resin so as to exhibit creep resistance. It can be an axial notch formed in the outer ring part or a through-hole formed in the outer ring part.

このようにすると、放熱板をプレス成形により製作する場合、プレス成形時に透孔や切り込みを打ち抜きにより形成することが可能となり、係合部を備えた放熱板を容易に製作することができる。   In this case, when the heat radiating plate is manufactured by press molding, it is possible to form through holes and notches by punching at the time of press molding, and it is possible to easily manufacture the heat radiating plate provided with the engaging portion.

放熱板の外環部の固定手段としては、前記外輪の端部に対する圧入、溶接等を採用することができる。放熱板の外環部が圧入によって前記外輪の端部に嵌合固定されたものとすると、溶接の場合と比して、外輪と放熱板との接触が確かになり、外輪と放熱板との熱伝導が得易くなる。   As a means for fixing the outer ring portion of the heat sink, press-fitting, welding, or the like to the end portion of the outer ring can be employed. Assuming that the outer ring of the heat sink is fitted and fixed to the end of the outer ring by press fitting, the contact between the outer ring and the heat sink is more reliable than in the case of welding. It becomes easy to obtain heat conduction.

ここで、前記放熱板の外環部が圧入接合によって前記外輪の端部に嵌合固定されたものとすることもできる。この圧入接合とは、固相接合の一種であり、放熱板の外環部の内周部と外輪の外周部との間に圧入代を設け、放熱板と外輪との間に通電して圧入代部分を軟化させ、圧入によって放熱板と外輪とを軸方向の接合位置に押し込むようにした固相接合をいう。   Here, the outer ring portion of the heat radiating plate may be fitted and fixed to the end portion of the outer ring by press-fitting. This press-fit joining is a kind of solid-phase joining, where a press-fitting allowance is provided between the inner peripheral part of the outer ring part of the heat sink and the outer peripheral part of the outer ring, and press-fitting is performed by energizing between the heat sink and the outer ring. This is a solid phase bonding in which the marginal portion is softened and the heat sink and the outer ring are pushed into the axial bonding position by press-fitting.

この圧入接合により放熱板を外輪の端部に嵌合固定すると、放熱板の外環部と外輪の外周部との接触が酸化皮膜等の影響を受けない良好な接合となり、放熱板が外輪の外周部に強固に固定される。   When the heat sink is fitted and fixed to the end of the outer ring by this press-fitting, the contact between the outer ring part of the heat sink and the outer peripheral part of the outer ring becomes a good joint that is not affected by the oxide film, etc. It is firmly fixed to the outer periphery.

また、圧入接合によって外輪と放熱板の接触が酸化皮膜等の影響を受けない良好な接合となり、外輪と放熱板の間の熱伝導が得易くなる。その結果、圧入のみで固定をした場合と比して、外輪の熱が効率良く放熱板に伝わるため、放熱性を向上させることができる。   In addition, the press-fit joining provides a good joining in which the contact between the outer ring and the heat radiating plate is not affected by an oxide film or the like, and heat conduction between the outer ring and the heat radiating plate is easily obtained. As a result, the heat of the outer ring is efficiently transmitted to the heat radiating plate as compared with the case where the fixing is performed only by press-fitting, so that the heat dissipation can be improved.

以上のように、この発明は、外輪の外径面に周溝が設けられ、この周溝に樹脂プーリが埋め込まれるので、周溝の側面と樹脂との間で生じる摩擦抵抗によって、樹脂プーリのクリープを防止することができる。
また、外輪の外径面の端部に放熱板が嵌合され、放熱板の外環部および内環部によって、露出する外輪の端部および端面の露出面積が大きくなるので、転がり軸受は放熱性が高められて、高温化が抑えられる。 As described above, according to the present invention, a circumferential groove is provided on the outer diameter surface of the outer ring, and the resin pulley is embedded in the circumferential groove. Therefore, the frictional resistance generated between the side surface of the circumferential groove and the resin causes the resin pulley to Creep can be prevented.
In addition, a heat sink is fitted to the end of the outer diameter surface of the outer ring, and the exposed outer area of the end of the outer ring and the end surface is increased by the outer ring portion and the inner ring portion of the heat sink. The property is enhanced and the high temperature is suppressed.

以下、この発明の実施形態に係る樹脂プーリ付き軸受を添付図面に基づいて説明する。
この第１実施形態に係る樹脂プーリ付き軸受は、転がり軸受１１の外輪１３の外周に射出成形により樹脂プーリ１８が一体化され、外輪１３の外径部の両端部に放熱板２１が嵌合固定されたものである。 Hereinafter, a bearing with a resin pulley according to an embodiment of the present invention will be described with reference to the accompanying drawings.
In the bearing with a resin pulley according to the first embodiment, the resin pulley 18 is integrated with the outer periphery of the outer ring 13 of the rolling bearing 11 by injection molding, and the heat sink 21 is fitted and fixed to both ends of the outer diameter portion of the outer ring 13. It has been done.

転がり軸受１１は、内輪１２と外輪１３との間で複数の玉１４が保持器１５により周方向に間隔をおいて保持されたものである。内輪１２と外輪１３との間の両端部が円環状のシール１６により封止されている。この転がり軸受１１としては、図１に示す深溝玉軸受に限られず、公知の転がり軸受を適用可能であり、例えば、アンギュラ玉軸受、円筒ころ軸受、円すいころ軸受等を適用することができる。   In the rolling bearing 11, a plurality of balls 14 are held between an inner ring 12 and an outer ring 13 by a cage 15 at intervals in the circumferential direction. Both end portions between the inner ring 12 and the outer ring 13 are sealed with an annular seal 16. The rolling bearing 11 is not limited to the deep groove ball bearing shown in FIG. 1, and a known rolling bearing can be applied. For example, an angular ball bearing, a cylindrical roller bearing, a tapered roller bearing, or the like can be applied.

外輪１３の外径面には周溝１７が設けられる。この周溝１７は、アキシアル断面の形状が矩形の角溝であり、外輪１３の軸方向中央に対して端面寄りに設けられている。この周溝１７の形状は、断面矩形の角溝に限られず、例えば、断面三角形、断面円弧形、断面台形などであってもよい。   A circumferential groove 17 is provided on the outer diameter surface of the outer ring 13. The circumferential groove 17 is a rectangular groove having a rectangular axial cross section, and is provided closer to the end surface with respect to the axial center of the outer ring 13. The shape of the circumferential groove 17 is not limited to a rectangular groove having a rectangular section, and may be, for example, a triangular section, a circular arc section, or a trapezoidal section.

前記周溝１７は、外輪１３の軸方向中央Ｐに対して端面寄りに設けられるため、射出成形時、熱収縮による樹脂プーリ１８の締め付け力が作用したとき、その締め付け力が外輪１３の外径面の、軌道の径方向の外側に対応する部分（外輪１３の外径面の軸方向中央部分）に直接作用しない。その結果、外輪１３の軌道の内径方向への変位が抑えられ、軸受の精度に及ぼす影響を抑えることができる。   Since the circumferential groove 17 is provided closer to the end surface with respect to the axial center P of the outer ring 13, when the tightening force of the resin pulley 18 due to thermal contraction is applied during injection molding, the tightening force is the outer diameter of the outer ring 13. It does not directly act on the portion of the surface corresponding to the outside in the radial direction of the track (the central portion in the axial direction of the outer diameter surface of the outer ring 13). As a result, the displacement of the race of the outer ring 13 in the inner diameter direction is suppressed, and the influence on the bearing accuracy can be suppressed.

樹脂プーリ１８は、図２に示すように、内周側に形成されるボス部１９とベルト（図示省略）が掛けられる外周部２０とが一体に形成されたものである。ボス部１９は外輪１３の外径面の軸方向の幅よりも小幅に形成される。外周部２０はその外端にプーリ溝が形成されている。   As shown in FIG. 2, the resin pulley 18 is formed by integrally forming a boss portion 19 formed on the inner peripheral side and an outer peripheral portion 20 on which a belt (not shown) is hung. The boss portion 19 is formed to be smaller than the axial width of the outer diameter surface of the outer ring 13. The outer peripheral portion 20 has a pulley groove formed at the outer end thereof.

小幅に形成された樹脂プーリ１８は、ボス部１９の両端面が外輪１３の両端面よりも軸方向内側となるように一体化されている。樹脂プーリ１８の一体化により、外輪１３の両端部および外径面の両端部が露出する。   The resin pulley 18 formed with a small width is integrated so that both end faces of the boss portion 19 are axially inner than both end faces of the outer ring 13. By integrating the resin pulley 18, both ends of the outer ring 13 and both ends of the outer diameter surface are exposed.

また、樹脂プーリ１８のボス部１９の軸方向中心を外輪１３の軸方向中心Ｐに一致させた状態で外輪１３の外周に一体化することができる。この場合、外輪１３の外径面の両端部の露出幅が同幅ａとなる（図１参照）。露出幅が同幅ａになると、外輪１３の外径面の両端部において、外輪１３の軌道と玉１４との摩擦熱により特に高温になり易い外輪１３の軸方向中央での熱を、外輪１３の両端部に嵌合した放熱板２１により偏りなく均等に放熱することができ、樹脂プーリ１８の熱膨張による歪みの発生が抑えられる。   Further, the boss portion 19 of the resin pulley 18 can be integrated with the outer periphery of the outer ring 13 in a state where the axial center of the boss portion 19 coincides with the axial center P of the outer ring 13. In this case, the exposed width of both ends of the outer diameter surface of the outer ring 13 is the same width a (see FIG. 1). When the exposed width is the same width a, heat at the center in the axial direction of the outer ring 13 that tends to become particularly high due to frictional heat between the raceway of the outer ring 13 and the balls 14 at both ends of the outer diameter surface of the outer ring 13 is obtained. The heat radiating plates 21 fitted to both ends of the radiating plate 21 can radiate heat evenly without deviation, and the occurrence of distortion due to the thermal expansion of the resin pulley 18 can be suppressed.

樹脂プーリ１８のボス部１９を形成する樹脂が周溝１７に埋め込まれており、転がり軸受１１の回転時、転がり軸受１１で発生する熱によって樹脂プーリ１８が熱膨張して周溝１７の側面を押し付ける。   The resin forming the boss portion 19 of the resin pulley 18 is embedded in the circumferential groove 17, and when the rolling bearing 11 rotates, the resin pulley 18 is thermally expanded by the heat generated in the rolling bearing 11, and the side surface of the circumferential groove 17 is covered. Press.

この周溝１７は断面矩形の角溝であるので、樹脂プーリ１８の押し付け力が、周溝１７の両側面に軸方向の押し付け力として他方向に分散することなく作用する。その結果、周溝１７の側面と樹脂プーリ１８との径方向接触領域で大きな摩擦抵抗を発生させることができ、より効果的に樹脂プーリ１８のクリープを防止することができる。   Since the circumferential groove 17 is a rectangular groove having a rectangular cross section, the pressing force of the resin pulley 18 acts on both side surfaces of the circumferential groove 17 without being dispersed in the other direction as an axial pressing force. As a result, a large frictional resistance can be generated in the radial contact region between the side surface of the circumferential groove 17 and the resin pulley 18, and the resin pulley 18 can be more effectively prevented from creeping.

外輪１３の両端部の露出部分には放熱板２１が圧入により嵌合固定されている。この放熱板２１は、外輪１３の外周部の端部に沿う筒状の外環部２２と、この外環部２２から内向きフランジ状に形成された内環部２３とを有する。   A heat radiating plate 21 is fitted and fixed to the exposed portions of both ends of the outer ring 13 by press-fitting. The heat radiating plate 21 has a cylindrical outer ring portion 22 along the outer peripheral end portion of the outer ring 13, and an inner ring portion 23 formed in an inward flange shape from the outer ring portion 22.

放熱板２１は、樹脂プーリ１８の射出樹脂より熱伝導性の高い金属製であり、具体的には、鋼板のプレス加工品からなり、容易に形成することができる。また、放熱板２１の材質は、熱伝導性が高いほどよく、比重が低いほど軽量化も図ることができる。さらに、放熱板２１の耐錆性を向上させるために、耐錆性を有する材質で製作したり、耐錆性を付与する表面処理を施したりすることができる。   The heat radiating plate 21 is made of a metal having higher thermal conductivity than the injection resin of the resin pulley 18, and is specifically made of a pressed product of a steel plate and can be easily formed. Moreover, the material of the heat sink 21 is better as the thermal conductivity is higher, and the weight can be reduced as the specific gravity is lower. Furthermore, in order to improve the rust resistance of the heat sink 21, it can be made of a material having rust resistance or can be subjected to a surface treatment that imparts rust resistance.

放熱板２１の外環部２２は、内周面が外輪１３の外周面に接しており、軸方向の内縁が樹脂プーリ１８のボス部１９に接している。また、内環部２３は、外輪１３の端面に接しており、その内縁が内輪１２の外径面付近にまで達して、シール１６の大部分を覆っている。   The outer ring portion 22 of the heat radiating plate 21 has an inner peripheral surface in contact with the outer peripheral surface of the outer ring 13 and an axial inner edge in contact with the boss portion 19 of the resin pulley 18. Further, the inner ring portion 23 is in contact with the end surface of the outer ring 13, and the inner edge reaches the vicinity of the outer diameter surface of the inner ring 12 and covers most of the seal 16.

このように、外輪１３の外径面の端部および端面の露出部分は、放熱板２１の外環部２２および内環部２３に接した状態で覆われている。この放熱板２１は表面が露出しているので、外環部２２および内環部２３の表面は、外輪１３の露出部分の面積（露出面積）よりも大きくなる。これにより、転がり軸受１１の回転により発生した熱の放熱面積が大きくなる。
また、放熱板２１の内環部２３は、内縁が内輪１２の外径面付近にまで達しているので、内環部２３のうち外輪１３の端面よりも径方向内側の部分の両面が露出して放熱面とされる。この内環部２３の放熱面によって、放熱板２１の放熱面積がさらに大きくなり、転がり軸受１１の放熱が効果的に行われ、高温化を抑えることができる。 As described above, the end portion of the outer diameter surface of the outer ring 13 and the exposed portion of the end surface are covered in a state of being in contact with the outer ring portion 22 and the inner ring portion 23 of the heat radiating plate 21. Since the surface of the heat radiating plate 21 is exposed, the surfaces of the outer ring portion 22 and the inner ring portion 23 are larger than the area (exposed area) of the exposed portion of the outer ring 13. Thereby, the radiation area of the heat generated by the rotation of the rolling bearing 11 is increased.
Further, since the inner edge of the inner ring portion 23 of the heat radiating plate 21 reaches the vicinity of the outer diameter surface of the inner ring 12, both surfaces of the inner ring portion 23 that are radially inward from the end surface of the outer ring 13 are exposed. The heat dissipation surface. Due to the heat dissipation surface of the inner ring portion 23, the heat dissipation area of the heat dissipation plate 21 is further increased, the heat dissipation of the rolling bearing 11 is effectively performed, and high temperature can be suppressed.

この実施形態では、前述のように、放熱板２１を外輪１３の端部に圧入により固定したが、放熱板２１の固定手段としては、射出成形時の位置ずれ、及び樹脂プーリ付き軸受としての所望の機能に影響しない限り、適宜の手段を採用することができる。例えば、放熱板２１を外輪１３に溶接により固定すると、外輪１３に対して放熱板２１が強固に固定され得る。   In this embodiment, as described above, the heat radiating plate 21 is fixed to the end of the outer ring 13 by press-fitting. However, as a fixing means of the heat radiating plate 21, a positional deviation at the time of injection molding and a desired bearing as a resin pulley bearing are desired. As long as the function is not affected, an appropriate means can be adopted. For example, when the heat sink 21 is fixed to the outer ring 13 by welding, the heat sink 21 can be firmly fixed to the outer ring 13.

また、放熱板２１の他の固定手段として、固相接合の一種である圧入接合により放熱板２１を外輪１３の端部に固定することができる。   In addition, as another fixing means of the heat sink 21, the heat sink 21 can be fixed to the end of the outer ring 13 by press-fitting that is a kind of solid phase bonding.

ここで、圧入接合とは、固相接合の一種であり、放熱板２１の外環部２２の内周部と外輪１３の外周部との間に圧入代を設け、放熱板と外輪との間に通電して圧入代部分を軟化させ、圧入によって放熱板と外輪とを軸方向の接合位置に押し込むようにした固相接合をいう。   Here, the press-fit joining is a kind of solid-phase joining, and a press-fitting allowance is provided between the inner peripheral portion of the outer ring portion 22 of the heat radiating plate 21 and the outer peripheral portion of the outer ring 13, and between the heat radiating plate and the outer ring. This is a solid phase bonding in which the press-fitting allowance portion is softened by energizing the heat sink, and the heat sink and the outer ring are pushed into the axial joining position by press-fitting.

この圧入接合は、図３（ａ）、（ｂ）に示す治具を用いて行われる。この治具は、下端部に円柱状の固定穴３２を備えたクロム銅製の挿し込み治具３１と、上端部に円筒状の固定穴３４を備えたクロム銅製の受け治具３３とからなり、この挿し込み治具３１と受け治具３３は、それぞれ電極として機能する。   This press-fit joining is performed using a jig shown in FIGS. 3 (a) and 3 (b). This jig is composed of a chromium copper insertion jig 31 having a columnar fixing hole 32 at the lower end and a chromium copper receiving jig 33 having a cylindrical fixing hole 34 at the upper end. The insertion jig 31 and the receiving jig 33 each function as an electrode.

この接合方法の一例としては、外輪１３の外周部と放熱板２１の外環部２２には所定の圧入代（外輪１３の外径Ｄ２と、放熱板２１の外環部２２の内径Ｄ１との差分）を形成する。挿し込み治具３１の固定穴３２に転がり軸受１１を固定し、転がり軸受１１の軸中心と同一軸心となるように、放熱板２１を受け治具３３の固定穴３４内に置く。   As an example of this joining method, a predetermined press-fitting allowance (an outer diameter D2 of the outer ring 13 and an inner diameter D1 of the outer ring portion 22 of the heat sink 21) is provided between the outer peripheral portion of the outer ring 13 and the outer ring portion 22 of the heat sink 21. Difference). The rolling bearing 11 is fixed in the fixing hole 32 of the insertion jig 31, and the heat radiating plate 21 is placed in the fixing hole 34 of the jig 33 so as to have the same axis as the axis center of the rolling bearing 11.

その後、プレス装置（図示省略）に固定した挿し込み治具３１とともに転がり軸受１１を軸方向に降下させて、放熱板２１の外環部２２と外輪１３とを、これらの間の圧入代部分が接触した状態とする（図３（ａ）参照）。   After that, the rolling bearing 11 is lowered in the axial direction together with the insertion jig 31 fixed to the press device (not shown), and the outer ring portion 22 and the outer ring 13 of the heat radiating plate 21 have a press-fitting allowance portion therebetween. It is set as the state which contacted (refer Fig.3 (a)).

この状態で、受け治具３３および挿し込み治具３１を介して放熱板２１と外輪１３の間に電流を通電し圧入開始する。圧入直後は、放熱板２１の外環部２２と外輪１３の接合部が狭いことから電流が集中して前記圧入代部分が軟化し、この軟化した状態で、転がり軸受１１が放熱板２１の外環部２２内に押し込まれる。   In this state, a current is passed between the heat sink 21 and the outer ring 13 via the receiving jig 33 and the insertion jig 31 to start press-fitting. Immediately after the press-fitting, since the joint between the outer ring portion 22 and the outer ring 13 of the heat sink 21 is narrow, the current is concentrated and the press-fitting allowance portion is softened. In this softened state, the rolling bearing 11 is outside the heat sink 21. It is pushed into the ring part 22.

圧入が開始されると、放熱板２１の外環部２２の内周部が外輪１３の外周部を移動し、放熱板２１が外輪１３に圧入され、さらに、図３（ｂ）に示すように、外輪１３の外周部と放熱板２１の外環部２２の内周部が固相接合される。   When the press-fitting is started, the inner peripheral portion of the outer ring portion 22 of the heat radiating plate 21 moves on the outer peripheral portion of the outer ring 13, and the heat radiating plate 21 is press-fitted into the outer ring 13, and as shown in FIG. The outer peripheral portion of the outer ring 13 and the inner peripheral portion of the outer ring portion 22 of the heat sink 21 are solid-phase bonded.

この圧入によって、外輪１３と放熱板２１の外環部２２の接合部の表面がしごかれて、不純物質層（油分、表面処理剤、酸化皮膜等）が取り除かれて清浄化される。この清浄な表面組織で接合が行われるため、酸化皮膜等の影響を受けない良好な接合が行われて、放熱板２１と外輪１３との接合強度が放熱板２１を圧入嵌合のみで外輪１３の外径部に固定する場合と比して高めることができる。   By this press-fitting, the surface of the joint portion of the outer ring 13 and the outer ring portion 22 of the heat sink 21 is squeezed, and the impurity layer (oil, surface treatment agent, oxide film, etc.) is removed and cleaned. Since the bonding is performed with this clean surface structure, good bonding without being affected by the oxide film or the like is performed, and the bonding strength between the heat sink 21 and the outer ring 13 is such that the heat sink 21 is press-fitted and the outer ring 13 is pressed. Compared to the case of fixing to the outer diameter portion of the slab, it can be increased.

次に、固定穴３２の内径を放熱板２１の外径とした挿し込み治具３１に、外周部の一端部に放熱板２１を固定した転がり軸受１１を、その放熱板２１が上方に位置するように固定する。この固定状態で、受け治具３３に置いた新たな放熱板２１を、前述した圧入接合方法により、外輪１３の外径面の他端部に固定する。   Next, the rolling bearing 11 in which the heat sink 21 is fixed to one end portion of the outer peripheral portion is inserted into the insertion jig 31 in which the inner diameter of the fixing hole 32 is set to the outer diameter of the heat sink 21. To fix. In this fixed state, the new heat sink 21 placed on the receiving jig 33 is fixed to the other end portion of the outer diameter surface of the outer ring 13 by the above-described press-fit joining method.

この圧入接合により放熱板２１を外輪１３の端部に嵌合固定すると、放熱板２１の外環部２２と外輪１３の外周部との接触が酸化皮膜等の影響を受けない良好な接合となり、放熱板２１が外輪１３の外周部に強固に固定される。   When the heat sink 21 is fitted and fixed to the end of the outer ring 13 by this press-fit bonding, the contact between the outer ring portion 22 of the heat sink 21 and the outer peripheral portion of the outer ring 13 becomes a good bond that is not affected by the oxide film, The heat sink 21 is firmly fixed to the outer peripheral portion of the outer ring 13.

また、圧入接合によって、外輪１３と放熱板２１の接触が酸化皮膜等の影響を受けない良好な接合となり、外輪１３と放熱板２１の間の熱伝導が得易くなる。その結果、圧入のみで固定をした場合と比して、外輪１３の熱が効率良く放熱板２１に伝わるため、放熱性を向上させることができる。   In addition, the press-fit joining provides a good joining in which the contact between the outer ring 13 and the heat radiating plate 21 is not affected by an oxide film or the like, and heat conduction between the outer ring 13 and the heat radiating plate 21 is easily obtained. As a result, the heat of the outer ring 13 is efficiently transmitted to the heat radiating plate 21 as compared with the case where the fixing is performed only by press fitting, so that the heat dissipation can be improved.

この放熱板２１の構造は、放熱板２１の外輪１３への固定、及び外輪１３の熱を放熱板２１を経て外部に放熱することが可能な限り、適宜に変更することができる。一例として、この発明の第２実施形態を図４に示す。なお、以下においては、前述の第１実施形態との相違点を中心に述べ、同一に考えられる構成に同符号を用いる。   The structure of the heat sink 21 can be appropriately changed as long as the heat sink 21 can be fixed to the outer ring 13 and the heat of the outer ring 13 can be radiated to the outside through the heat sink 21. As an example, a second embodiment of the present invention is shown in FIG. In the following description, differences from the first embodiment will be mainly described, and the same reference numerals will be used for the same configuration.

この実施形態に係る樹脂プーリ付き軸受は、放熱板２１の内環部２３がアキシアル断面の形状を波形とした湾曲部を備えたものである。このようにすると、湾曲部２４を備えた内環部２３は、第１実施形態の場合と比較して、放熱面積が増大するので、放熱性がさらに向上し、転がり軸受１１の高温化を効果的に抑制することができる。   In the bearing with a resin pulley according to this embodiment, the inner ring portion 23 of the heat radiating plate 21 includes a curved portion having a wave shape in the axial cross section. In this way, the inner ring portion 23 provided with the curved portion 24 has an increased heat dissipation area as compared with the case of the first embodiment, so that the heat dissipation is further improved, and the high temperature of the rolling bearing 11 is effective. Can be suppressed.

また、内環部２３の湾曲部２４を径方向内向きに形成し、転がり軸受１１のシール１６を覆うように形成することができる。この場合、湾曲部２４により外的要因によるシール１６の損傷を防止することもできる。   Further, the curved portion 24 of the inner ring portion 23 can be formed inward in the radial direction so as to cover the seal 16 of the rolling bearing 11. In this case, the curved portion 24 can also prevent damage to the seal 16 due to external factors.

この発明の第３実施形態を図５に示す。
第３実施形態に係る樹脂プーリ付き軸受は、放熱板２１の内環部２３に周方向の溝２５が形成された点で、前述の第１実施形態の構成と相違する。その他の構成は、第１実施形態と同様であり、同一に考えられる構成に同符号を用いる。 A third embodiment of the present invention is shown in FIG.
The bearing with a resin pulley according to the third embodiment is different from the configuration of the first embodiment described above in that a circumferential groove 25 is formed in the inner ring portion 23 of the heat radiating plate 21. Other configurations are the same as those in the first embodiment, and the same reference numerals are used for the same configurations.

この実施形態では、放熱板２１の内環部２３の溝２５により、内環部２３表面（軸方向外面）の露出面積が大きくなる。このため、前述の第１実施形態の放熱板２１と比して、放熱性が向上する。   In this embodiment, the exposed area of the surface of the inner ring portion 23 (the outer surface in the axial direction) is increased by the groove 25 of the inner ring portion 23 of the heat sink 21. For this reason, heat dissipation improves compared with the heat sink 21 of the above-mentioned 1st Embodiment.

この発明の第４実施形態を図６に示す。
この第４実施形態に係る樹脂プーリ付き軸受は、転がり軸受１１を取り付ける締結部材２７を備え、放熱板２１の内環部２３が軸方向外向きに延びる筒状部２６を備えたものである点で、前述の第１実施形態と相違する。その他の構成は、前記第１実施形態と同様であり、同一に考えられる構成に同符号を用いる。 A fourth embodiment of the present invention is shown in FIG.
The bearing with a resin pulley according to the fourth embodiment is provided with a fastening member 27 to which the rolling bearing 11 is attached, and an inner ring portion 23 of the heat radiating plate 21 is provided with a cylindrical portion 26 extending outward in the axial direction. This is different from the first embodiment described above. Other configurations are the same as those in the first embodiment, and the same reference numerals are used for the same configurations.

この締結部材２７は、図示しないエンジンブロック等のプーリ取り付け対象にプーリ付き軸受を取り付ける際に使用される部材であり、例えば、内輪１２の内周に嵌合する筒状部２８と、この筒状部２８の端部に形成された鍔２９を備えている。   The fastening member 27 is a member used when attaching a bearing with a pulley to an object to be attached to a pulley such as an engine block (not shown). For example, a cylindrical portion 28 fitted to the inner periphery of the inner ring 12 and the cylindrical shape. A flange 29 is provided at the end of the portion 28.

この樹脂プーリ付き軸受の取り付けは、図６に示すように、内輪１２の内周の両側から、締結部材２７の筒状部２８をそれぞれ嵌合し、鍔２９を内輪１２の端面に接触させ、図示しないボルトを締結部材２７の筒状部２８内に挿通して、ボルトを締め付ける。これにより、樹脂プーリ付き軸受がプーリ取り付け対象に取り付けられる。   As shown in FIG. 6, the bearing with this resin pulley is fitted with the cylindrical portions 28 of the fastening members 27 from both sides of the inner periphery of the inner ring 12, and the flange 29 is brought into contact with the end surface of the inner ring 12. A bolt (not shown) is inserted into the cylindrical portion 28 of the fastening member 27 to tighten the bolt. Thereby, a bearing with a resin pulley is attached to a pulley attachment object.

この取り付けにより、放熱板２１の内環部２３の筒状部２６と、締結部材２７の鍔２９とがラビリンスシールを形成する。このラビリンスシールが形成されると、転がり軸受１１の内部への、異物の混入が防止される。   By this attachment, the cylindrical portion 26 of the inner ring portion 23 of the heat radiating plate 21 and the flange 29 of the fastening member 27 form a labyrinth seal. When this labyrinth seal is formed, foreign matters are prevented from entering the rolling bearing 11.

また、放熱板２１の内環部２３の筒状部２６は、その内外周面が露出しているので、放熱面とされる。この筒状部２６の放熱面によって、放熱板２１の放熱面積が、第１実施形態の場合と比して、さらに大きくなり、放熱が効果的に行われて、転がり軸受１１の高温化を抑えることができる。   Moreover, since the inner peripheral surface is exposed, the cylindrical part 26 of the inner ring part 23 of the heat radiating plate 21 is a heat radiating surface. Due to the heat radiating surface of the cylindrical portion 26, the heat radiating area of the heat radiating plate 21 is further increased as compared with the case of the first embodiment, and the heat radiating is effectively performed, and the high temperature of the rolling bearing 11 is suppressed. be able to.

前述の第１から第４の実施形態においては、外輪１３の外径面に周溝１７を設け、周溝１７に樹脂プーリ１８の樹脂を埋め込んで、樹脂プーリ１８の外輪１３に対するクリープを防止するようにしたが、クリープ防止手段としては、樹脂プーリ１８の射出成形時の位置ずれ、及び樹脂プーリ付き軸受としての所望の機能に影響しない限り、適宜の手段を採用することができる。   In the first to fourth embodiments described above, the circumferential groove 17 is provided on the outer diameter surface of the outer ring 13 and the resin of the resin pulley 18 is embedded in the circumferential groove 17 to prevent the resin pulley 18 from creeping with respect to the outer ring 13. However, as the creep preventing means, any appropriate means can be adopted as long as it does not affect the positional deviation at the time of injection molding of the resin pulley 18 and the desired function as the bearing with the resin pulley.

その一例として、この発明の第５実施形態を図７、図８に基づいて説明する。なお、以下においては、上記第１実施形態との相違点を中心に述べ、同一に考えられる構成に同符号を用いる。   As an example, a fifth embodiment of the present invention will be described with reference to FIGS. In the following, differences from the first embodiment will be mainly described, and the same reference numerals will be used for the same conceivable configurations.

第５実施形態の樹脂プーリ付き軸受は、図７に示すように、樹脂プーリ１８の内周部が放熱板２１の外環部２２のうち軸方向内側部分を埋め込んだ状態で、外輪１３の外周に一体化されたものである。   As shown in FIG. 7, the bearing with the resin pulley of the fifth embodiment has an outer periphery of the outer ring 13 in a state in which the inner peripheral portion of the resin pulley 18 embeds the axially inner portion of the outer ring portion 22 of the heat sink 21. It is integrated with.

この放熱板２１の外環部２２には、切り込み３５が周方向に間隔をもって複数形成されている。各切り込み３５は外環部２２の幅方向の端縁から内環部２３に向かってＶ字状に切り込まれている（図８参照）。   A plurality of cuts 35 are formed in the outer ring portion 22 of the heat radiating plate 21 at intervals in the circumferential direction. Each cut 35 is cut in a V shape from the edge in the width direction of the outer ring portion 22 toward the inner ring portion 23 (see FIG. 8).

樹脂プーリ１８が一体化されると、切り込み３５に樹脂が埋め込まれ、樹脂プーリ１８が各切り込み３５に係合する。この係合部としての切り込み３５によって、樹脂プーリ１８のクリープに対する耐力を向上させることができる。   When the resin pulleys 18 are integrated, the resin is embedded in the cuts 35 and the resin pulleys 18 are engaged with the cuts 35. By the notch 35 as the engaging portion, the resistance of the resin pulley 18 to creep can be improved.

また、放熱板２１の外環部２２の軸方向内側部分は、樹脂プーリ１８のボス部１９に埋め込まれているので、転がり軸受１１で発生した熱は、外輪１３から放熱板２１の外環部２２または樹脂プーリ１８に伝わる。放熱板２１の外環部２２は樹脂プーリ１８を形成する樹脂よりも熱伝導性が高い。   Further, since the axially inner portion of the outer ring portion 22 of the heat sink 21 is embedded in the boss portion 19 of the resin pulley 18, the heat generated in the rolling bearing 11 is transferred from the outer ring 13 to the outer ring portion of the heat sink 21. 22 or resin pulley 18. The outer ring portion 22 of the heat radiating plate 21 has higher thermal conductivity than the resin forming the resin pulley 18.

このため、外輪１３の熱は、樹脂プーリ１８よりも放熱板２１の外環部２２に伝わり易く、外環部２２から内環部２３に移動する。その結果、樹脂プーリ１８に蓄熱され難くなり、転がり軸受１１の高温化を抑えることができる。   For this reason, the heat of the outer ring 13 is more easily transferred to the outer ring part 22 of the heat sink 21 than the resin pulley 18 and moves from the outer ring part 22 to the inner ring part 23. As a result, it is difficult for heat to be stored in the resin pulley 18, and the high temperature of the rolling bearing 11 can be suppressed.

なお、この樹脂プーリの外周部に作用するトルクが小さい場合、放熱板２１の外環部２２に係合部としての切り込み３５を形成せず、外環部２２の軸方向内縁の端面と樹脂プーリ１８との間で生じる摩擦抵抗によってクリープを防止してもよい。
一方、樹脂プーリ１８の外周部に大きなトルクが作用する場合、より大きなクリープに対する耐力が必要な場合、外輪１３の外周部に周溝１７を設けるとともに、放熱板２１の外環部２２に切り込み３５を備えたものとすることができる。 In addition, when the torque which acts on the outer peripheral part of this resin pulley is small, the notch 35 as an engaging part is not formed in the outer ring part 22 of the heat sink 21, but the end surface of the axial inner edge of the outer ring part 22 and the resin pulley The creep may be prevented by the frictional resistance generated between the two.
On the other hand, when a large torque is applied to the outer peripheral portion of the resin pulley 18 and a greater creep resistance is required, a circumferential groove 17 is provided in the outer peripheral portion of the outer ring 13 and a cut 35 is formed in the outer ring portion 22 of the heat sink 21. Can be provided.

この第５実施形態の変形例として、この発明の第６実施形態を図９、１０に示す。
この第６実施形態は、放熱板２１の外環部２２に、透孔３６が周方向に間隔をもって複数形成されたものである。 As a modification of the fifth embodiment, FIGS. 9 and 10 show a sixth embodiment of the present invention.
In the sixth embodiment, a plurality of through holes 36 are formed in the outer ring portion 22 of the heat radiating plate 21 at intervals in the circumferential direction.

放熱板２１の透孔３６は、図１０に示すように、外環部２２を貫通している。樹脂プーリ１８が一体化されると、透孔３６に樹脂が埋め込まれ、樹脂プーリ１８がこの透孔３６に係合する。この係合部としての透孔３６によって、樹脂プーリ１８のクリープに対する耐力を向上させることができる（図９参照）。   As shown in FIG. 10, the through hole 36 of the heat radiating plate 21 passes through the outer ring portion 22. When the resin pulley 18 is integrated, the resin is embedded in the through hole 36, and the resin pulley 18 engages with the through hole 36. Through the through hole 36 as the engaging portion, the resistance of the resin pulley 18 to creep can be improved (see FIG. 9).

第１実施形態に係る樹脂プーリ付き軸受を示す縦断面図The longitudinal cross-sectional view which shows the bearing with a resin pulley which concerns on 1st Embodiment 同上の樹脂プーリ付き軸受を示す一部拡大断面図Partially enlarged sectional view showing the same bearing with resin pulley （ａ）同上の放熱板の外輪への嵌合前の状態を示す作用図、（ｂ）同上の放熱板の外輪への嵌合後の状態を示す作用図(A) Operation diagram showing a state before the heat sink is fitted to the outer ring, (b) Operation diagram showing a state after the heat sink is fitted to the outer ring 第２実施形態に係る樹脂プーリ付き軸受を示す一部拡大断面図Partially enlarged sectional view showing a bearing with a resin pulley according to a second embodiment 第３実施形態に係る樹脂プーリ付き軸受を示す一部拡大断面図Partially enlarged sectional view showing a bearing with a resin pulley according to a third embodiment 第４実施形態に係る樹脂プーリ付き軸受を示す一部拡大断面図Partially enlarged sectional view showing a bearing with a resin pulley according to a fourth embodiment 第５実施形態に係る樹脂プーリ付き軸受を示す一部拡大断面図The partially expanded sectional view which shows the bearing with a resin pulley which concerns on 5th Embodiment 同上の放熱板を示す斜視図The perspective view which shows a heat sink same as the above 第６実施形態に係る樹脂プーリ付き軸受を示す一部拡大断面図Partially enlarged sectional view showing a bearing with a resin pulley according to a sixth embodiment 同上の放熱板を示す斜視図The perspective view which shows a heat sink same as the above

符号の説明Explanation of symbols

１１ 転がり軸受
１２ 内輪
１３ 外輪
１４ 玉
１５ 保持器
１６ シール
１７ 周溝
１８ 樹脂プーリ
１９ ボス部
２０ 外周部
２１ 放熱板
２２ 外環部
２３ 内環部
２４ 湾曲部
２５ 溝
２６ 筒状部
２７ 締結部材
２８ 筒状部
２９ 鍔
３１ 挿し込み治具
３２ 固定穴
３３ 受け治具
３４ 固定穴
３５ 切り込み
３６ 透孔 DESCRIPTION OF SYMBOLS 11 Rolling bearing 12 Inner ring 13 Outer ring 14 Ball 15 Cage 16 Seal 17 Circumferential groove 18 Resin pulley 19 Boss part 20 Outer part 21 Heat sink 22 Outer ring part 23 Inner ring part 24 Curved part 25 Groove 26 Cylindrical part 27 Fastening member 28 Cylindrical portion 29 鍔 31 Insertion jig 32 Fixing hole 33 Receiving jig 34 Fixing hole 35 Cutting 36 Through hole

Claims (11)

転がり軸受と、この転がり軸受の外周に射出成形により一体化された樹脂プーリとからなる樹脂プーリ付き軸受において、
外輪の外周部に周溝が設けられ、前記樹脂プーリの樹脂が前記周溝に埋め込まれ、前記樹脂プーリの内周部の両端面が前記外輪の両端面よりも軸方向内側に位置し、前記外輪の端部に嵌合される金属製の放熱板を備え、この放熱板は、前記外輪の端部に沿う外環部と、この外環部から内向きフランジ状に形成され前記外輪の端面に接触する内環部とを有し、前記放熱板は、外環部の軸方向両側の外周面と内環部の外面とが露出するものであることを特徴とする樹脂プーリ付き軸受。 In a bearing with a resin pulley comprising a rolling bearing and a resin pulley integrated with the outer periphery of the rolling bearing by injection molding,
A peripheral groove is provided on the outer peripheral portion of the outer ring, the resin of the resin pulley is embedded in the peripheral groove, and both end surfaces of the inner peripheral portion of the resin pulley are positioned on the inner side in the axial direction from both end surfaces of the outer ring, The heat sink includes a metal heat sink fitted to the end of the outer ring. The heat sink is formed as an inward flange from the outer ring along the end of the outer ring, and the end face of the outer ring. possess and an inner ring portion in contact with the heat sink, a resin pulley with bearings, characterized in that the outer surface of the outer peripheral surface and the inner ring portion in the axial direction on both sides of the outer annular portion is one that is exposed. 前記放熱板の内環部がアキシアル断面の形状を波形とした湾曲部を備えたことを特徴とする請求項１に記載の樹脂プーリ付き軸受。   The bearing with a resin pulley according to claim 1, wherein the inner ring portion of the heat radiating plate includes a curved portion whose corrugated shape is an axial cross section. 前記湾曲部が前記転がり軸受のシールを覆う位置に径方向内向きに形成されたことを特徴とする請求項２に記載の樹脂プーリ付き軸受。   The bearing with a resin pulley according to claim 2, wherein the curved portion is formed radially inward at a position covering the seal of the rolling bearing. 前記内環部に前記外輪の周方向に沿う溝が形成されたことを特徴とする請求項１に記載の樹脂プーリ付き軸受。   The bearing with a resin pulley according to claim 1, wherein a groove along the circumferential direction of the outer ring is formed in the inner ring portion. 前記転がり軸受を取り付ける締結部材を備え、この締結部材は内輪の内周に嵌合され、前記内輪の端面に接触する鍔を有し、前記内環部に軸方向外向きに延びる筒状部を備え、この筒状部の内周部と前記締結部材の鍔との間でラビリンスシールが形成されたことを特徴とする請求項１に記載の樹脂プーリ付き軸受。   A fastening member for attaching the rolling bearing is provided. The fastening member is fitted to the inner periphery of the inner ring, has a flange that contacts the end surface of the inner ring, and has a cylindrical part extending outward in the axial direction on the inner ring part. The bearing with a resin pulley according to claim 1, wherein a labyrinth seal is formed between an inner peripheral portion of the cylindrical portion and a flange of the fastening member. 前記樹脂プーリの内周部が前記放熱板の外環部のうち軸方向内側部分を埋め込んだ状態で、前記外輪の外周に一体化されたことを特徴とする請求項１から５のいずれか１つに記載の樹脂プーリ付き軸受。   6. The resin pulley according to claim 1, wherein an inner peripheral portion of the resin pulley is integrated with an outer periphery of the outer ring in a state in which an inner portion in the axial direction is embedded in an outer ring portion of the heat radiating plate. Bearing with resin pulley as described in 1. 前記外輪の外周部に設けられた周溝の代わりに、またはその周溝とともに、前記放熱板の外環部のうち前記樹脂プーリとの接触部分に前記樹脂プーリの内周部が埋め込まれる係合部を備えたことを特徴とする請求項６に記載の樹脂プーリ付き軸受。   Engagement in which the inner peripheral portion of the resin pulley is embedded in the contact portion with the resin pulley in the outer ring portion of the heat sink instead of or along with the peripheral groove provided in the outer peripheral portion of the outer ring The bearing with a resin pulley according to claim 6, further comprising a portion. 前記係合部が前記外環部に形成された軸方向の切り込みであることを特徴とする請求項７に記載の樹脂プーリ付き軸受。   The bearing with a resin pulley according to claim 7, wherein the engaging portion is an axial notch formed in the outer ring portion. 前記係合部が前記外環部に形成された透孔であることを特徴とする請求項７に記載の樹脂プーリ付き軸受。   The bearing with a resin pulley according to claim 7, wherein the engaging portion is a through hole formed in the outer ring portion. 前記放熱板の外環部が圧入によって前記外輪の端部に嵌合固定されたものであることを特徴とする請求項１から９のいずれか１つに記載の樹脂プーリ付き軸受。   The bearing with a resin pulley according to any one of claims 1 to 9, wherein an outer ring portion of the heat radiating plate is fitted and fixed to an end portion of the outer ring by press-fitting. 前記放熱板の外環部が圧入接合によって前記外輪の端部に嵌合固定されたものであることを特徴とする請求項１から９のいずれか１つに記載の樹脂プーリ付き軸受。   The bearing with a resin pulley according to any one of claims 1 to 9, wherein an outer ring portion of the heat radiating plate is fitted and fixed to an end portion of the outer ring by press fitting.
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