JP4164239B2

JP4164239B2 - Bearing with resin pulley

Info

Publication number: JP4164239B2
Application number: JP2001019816A
Authority: JP
Inventors: 敬祐森
Original assignee: JTEKT Corp
Current assignee: JTEKT Corp
Priority date: 2001-01-29
Filing date: 2001-01-29
Publication date: 2008-10-15
Anticipated expiration: 2021-01-29
Also published as: JP2002227972A

Description

【０００１】
【発明の属する技術分野】
本発明は、ベルト伝動機構、特に自動車の補機駆動用ベルト等での使用に好適な樹脂製プーリ付き軸受に関する。
【０００２】
【従来の技術】
従来より、自動車の補機にエンジンの回転動力を伝達するための補機駆動用ベルト等で使用されるプーリには、その重量軽減ならびにコスト削減のため、転がり軸受の金属製の外輪の外周面に合成樹脂製のプーリを一体成形してなる樹脂プーリ付き軸受が用いられている。樹脂プーリとしては、例えば、使用温度域が高く、熱硬化性であるフェノール樹脂等が用いられる。
【０００３】
【発明が解決しようとする課題】
樹脂プーリは、鉄製のプーリに比べて熱伝導性に劣るため放熱性が悪く、そのため、転がり軸受の回転によって発生する熱が転がり軸受内にこもってしまう。その結果、転がり軸受の内部に充填されているグリースの劣化が促進されてしまうという問題があった。
【０００４】
この発明は、転がり軸受内部に熱がこもるのを防ぎ、グリースの劣化を抑制して軸受の寿命を向上させることができる樹脂プーリ付き軸受を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明の請求項１の樹脂プーリ付き軸受は、転がり軸受の外輪の外周面に樹脂製のプーリを射出成形によって一体成形した樹脂プーリ付き軸受であって、前記樹脂プーリに、貫通孔を形成し、前記貫通孔は、一端開口部が前記転がり軸受の玉の軸方向幅範囲内で前記樹脂プーリの内周面に開口し、他端開口部がベルト案内面に開口し、前記樹脂プーリの内周面は前記外輪の前記一端開口部に対応する箇所を除く外周面全体に当接していることを特徴とするものである。
【０００６】
なお、貫通孔のベルト案内面側の他端開口部を、樹脂プーリの回転方向前方に偏位させてもよい。また、樹脂プーリに複数個の貫通孔を設けてもよく、しかも、各貫通孔が転がり軸受の軸心に対し均等に配置されていてもよい。
【０００７】
このように、樹脂プーリに貫通孔を形成したことで貫通孔内に空気が充填され、空気の熱伝導性は樹脂の熱伝導性に比べ優れているため、貫通孔を形成したことで樹脂プーリの放熱性が向上し、よって転がり軸受の熱が貫通孔内の空気を伝ってベルト案内面がら放出され、転がり軸受内部に熱がこもるのを防ぐことができる。
【０００８】
また、貫通孔のベルト案内面側の他端開口部を、樹脂プーリの回転方向前方に偏位させることで、貫通孔内に空気が流入し易くなり、転がり軸受の放熱が確実に行える。
【０００９】
さらに、樹脂プーリに複数個の貫通孔を転がり軸受の軸心に対し均等に配置することで、温度分布に係わりなく転がり軸受の放熱が効率良く行える。
【００１０】
本発明の請求項５の樹脂プーリ付き軸受は、転がり軸受の外輪の外周面に樹脂製のプーリを射出成形によって一体成形した樹脂プーリ付き軸受であって、前記樹脂プーリに、吸気孔と排気孔とからなる通気孔を形成し、前記吸気孔は、一端開口部が前記転がり軸受の玉の軸方向幅範囲内で前記樹脂プーリの内周面に開口し、他端開口部がベルト案内面に開口し、前記排気孔は、一端開口部が前記吸気孔の一端開口部と同じ位置に開口し、他端開口部がベルト案内面の前記吸気孔の他端開口部と異なる位置に開口し、前記樹脂プーリの内周面は前記外輪の前記吸気孔の一端開口部および前記排気孔の一端開口部に対応する箇所を除く外周面全体に当接していることを特徴とするものである。吸気孔と排気孔とは、例えば、樹脂プーリの回転方向に並んで配設されていてもよく、あるいは転がり軸受の軸心方向に並んで配設されていてもよい。
【００１１】
なお、吸気孔のベルト案内面側の開口部を、樹脂プーリの回転方向前方に偏位させてもよい。また、樹脂プーリに互いに独立した複数個の通気孔を設けてもよく、しかも、各通気孔が転がり軸受の軸心に対し均等に配置されていてもよい。
【００１２】
このように、樹脂プーリに吸気孔と排気孔とからなる通気孔を形成したことで通気孔内に空気が充填され、空気の熱伝導性は樹脂の熱伝導性に比べ優れているため、通気孔を形成したことで樹脂プーリの放熱性が向上し、よって転がり軸受の熱が通気孔内の空気を伝ってベルト案内面から放出され、転がり軸受内部に熱がこもるのを防ぐことができる。
【００１３】
また、転がり軸受の回転に伴い、吸気孔から空気が流入し、外輪の外周面を通って排気孔から排気されるので、転がり軸受の熱が通気孔内を流れる空気によってベルト案内面から放出され、転がり軸受内部に熱がこもるのをより一層防ぐことができる。
【００１４】
また、吸気孔のベルト案内面側の開口部を、樹脂プーリの回転方向前方に偏位させることで、通気孔内に空気が流入し易くなり、転がり軸受の放熱が確実に行える。
【００１５】
さらに、樹脂プーリに複数個の通気孔を転がり軸受の軸心に対し均等に配置することで、温度分布に係わりなく転がり軸受の放熱が効率良く行える。
【００１６】
【発明の実施の形態】
（第１の実施の形態）
本発明の第１の実施の形態について、図１ないし図４を用いて説明する。
【００１７】
図１は、転がり軸受の外輪１１の外周面１２に合成樹脂製のプーリ１３を一体成形してなる樹脂プーリ付き軸受１０の部分断面図を示しており、樹脂プーリ１３の外周面は補機駆動用ベルト（図示せず）を掛けるベルト案内面１４となっており、かつ、樹脂プーリ１３のウェブ１５には貫通孔１７が形成されている。なお、１６は樹脂プーリ１３の補強リブであり、ウェブ１５の軸方向両側面に所定間隔置きに中心から放射状に形成されている。
【００１８】
次に、図２および図３を用いて、貫通孔１７について詳細に説明する。
【００１９】
貫通孔１７は、一端が外輪１１の外周面１２に開口し、他端が樹脂プーリ１３のベルト案内面１４に開口した直線状の孔である。また、貫通孔１７は、樹脂プーリ１３のウェブ１５部分において、転がり軸受の軸心Ｃ-Ｃに対して均等に配置して４箇所に形成されている。
【００２０】
さらに、各貫通孔１７は、ベルト案内面１４側の開口部が樹脂プーリ１３の回転方向（矢印Ａ方向）前方に傾斜角θだけ偏位している。傾斜角θは、樹脂プーリ１３の回転時に、貫通孔１７内に空気が流入し易い、例えば５°〜４５°内の適宜な角度に設定する。
【００２１】
次に、図４を用いて、転がり軸受の外輪１１の外周面１２に樹脂プーリ１３を一体成形する作業について説明する。樹脂プーリ１３は、例えば、射出成形によって形成される。すなわち、転がり軸受またはその外輪１１を金型３０内に芯出し固定し、かつ、貫通孔１７を形成する位置に棒状金型３４を所定の角度にて差し込み、先端を外輪１１の外周面１２に当接させる。次に、型内のキャビティ３３にランナ３１ならびに樹脂注入ゲート３２を介して溶融樹脂を充填し、固化させた後、棒状金型３４を抜き取り型開きを行って形成する。
【００２２】
次に、転がり軸受の放熱作用について説明する。すなわち、樹脂プーリ１３の回転に伴って、樹脂プーリ１３の回転方向前方に傾斜角θだけ偏位した貫通孔１７のベルト案内面１４側の開口部から空気が貫通孔１７内に流入する。貫通孔１７は、外輪１１の外周面１２とベルト案内面１４との間に連通しており、転がり軸受の回転によって発生する熱が貫通孔１７内の空気を伝ってベルト案内面１４から放出され、転がり軸受内に熱がこもるのを防ぐ。
【００２３】
なお、貫通孔１７の個数は特に限定されるものではなく、１個あるいは２個以上の複数個のいずれであってもよい。また、貫通孔１７は樹脂プーリ１３の回転方向前方に傾斜しておらず、軸心Ｃ-Ｃに対し放射状に形成されていてもよく、あるいは樹脂プーリ１３の補強リブ１６部分に形成されていてもよい。さらに、貫通孔１７は直線状に限るものではなく、しかも圧力差によって吸気が円滑に行えるように途中で径が変化するようなものでもよく、また空気が流入し易いようにベルト案内面１４側の開口部に空気を内部に案内する凹部等を形成したものであってもよい。
（第２の実施の形態）
本発明の第２の実施の形態について、図５および図６を用いて説明する。
【００２４】
この実施の形態は、樹脂プーリ１３に、一端がベルト案内面１４に開口し他端が外輪１１の外周面１２に開口した吸気孔４１と、一端が吸気孔４１の外輪外周面側の開口部に連通し他端がベルト案内面１４に開口した排気孔４２とからなる通気孔４０を形成したものであり、吸気孔４１と排気孔４２は、樹脂プーリ１３の回転方向に並んで配設されている。
【００２５】
通気孔４０は、樹脂プーリ１３のウェブ１５部分において、転がり軸受の軸心Ｃ-Ｃに対して均等に配置して４箇所に形成されている。また、各通気孔４０の吸気孔４１は、ベルト案内面１４側の開口部が樹脂プーリ１３の回転方向（矢印Ａ方向）前方に、空気が流入し易い傾斜角θ、例えば５°〜４５°だけ偏位している。なお、排気孔４２の傾斜角は特に限定されるものではない。
【００２６】
また、転がり軸受の外輪１１の外周面１２に樹脂プーリ１３を一体成形する作業は、第１の実施の形態と同様、金型内に吸気孔４１ならびに排気孔４２を形成するための一対の棒状金型を差込み、溶融樹脂を充填/固化してなる射出成形によって行う。
【００２７】
次に、転がり軸受の放熱作用について説明する。すなわち、樹脂プーリ１３の回転に伴って、樹脂プーリ１３の回転方向前方に傾斜角θだけ偏位した吸気孔４１のベルト案内面１４側の開口部から空気が通気孔４０内に流入する。通気孔４０は、外輪１１の外周面１２とベルト案内面１４との間に連通しており、転がり軸受の回転によって発生する熱が通気孔４０内の空気を伝ってベルト案内面１４から放出され、転がり軸受内に熱がこもるのを防ぐ。
【００２８】
また、転がり軸受の回転に伴って、吸気孔４１内にベルト案内面１４側の開口部から空気が流入し、外輪１１の外周面１２を通って排気孔４２のベルト案内面１４側の開口部から排気されるので、軸受の熱が通気孔４０内を流れる空気によってベルト案内面１４から放出され、転がり軸受内部に熱がこもるのをより一層防ぐことができる。
【００２９】
なお、通気孔４０の個数は特に限定されるものではなく、１個あるいは２個以上の複数個のいずれであってもよい。また、吸気孔４１は傾斜しておらず、軸心Ｃ-Ｃに対し放射状に形成されていてもよい。また、吸気孔４１ならびに排気孔４２は直線状に限るものではなく、しかも圧力差によって吸排気が円滑に行えるように途中で径が変化するようなものでもよく、また空気が流入し易いように吸気孔４１のベルト案内面１４側の開口部に空気を内部に案内する凹部等を形成したものであってもよい。さらに、排気孔４２を補強リブ１６に形成してもよい。（第３の実施の形態）
本発明の第３の実施の形態について、図７および図８を用いて説明する。
【００３０】
この実施の形態は、樹脂プーリ１３に、一端がベルト案内面１４に開口し他端が外輪１１の外周面１２に開口した吸気孔５１と、一端が吸気孔５１の外輪外周面側の開口部に連通し他端がベルト案内面１４に開口した排気孔５２とからなる通気孔５０を形成したものであり、吸気孔５１と排気孔５２は、転がり軸受の軸心方向に並んで配設されている。
【００３１】
通気孔５０は、樹脂プーリ１３の補強リブ１６部分において、転がり軸受の軸心Ｃ-Ｃに対して均等に配置して４箇所に形成されている。また、吸気孔５１のベルト案内面１４側の開口部には、空気を内部に案内する凹部が形成されている。
【００３２】
また、転がり軸受の外輪１１の外周面１２に樹脂プーリ１３を一体成形する作業は、第１の実施の形態と同様、金型内に吸気孔５１ならびに排気孔５２を形成するための一対の棒状金型を差込み、溶融樹脂を充填/固化してなる射出成形によって行う。
【００３３】
次に、転がり軸受の放熱作用について説明する。すなわち、樹脂プーリ１３の回転に伴って、吸気孔５１のベルト案内面１４側の開口部から空気が通気孔５０内に流入する。通気孔５０は、外輪１１の外周面１２とベルト案内面１４との間に連通しており、転がり軸受の回転によって発生する熱が通気孔５０内の空気を伝ってベルト案内面１４から放出され、転がり軸受内に熱がこもるのを防ぐ。
【００３４】
また、転がり軸受の回転に伴って、吸気孔５１内にベルト案内面１４側の開口部から空気が流入し、外輪１１の外周面１２を通って排気孔５２のベルト案内面１４側の開口部から排気されるので、軸受の熱が通気孔５０内を流れる空気によってベルト案内面１４から放出され、転がり軸受内部に熱がこもるのをより一層防ぐことができる。
【００３５】
なお、通気孔５０の個数は特に限定されるものではなく、１個あるいは２個以上の複数個のいずれであってもよい。また、吸気孔５１ならびに排気孔５２は直線状に限るものではなく、しかも圧力差によって吸排気が円滑に行えるように途中で径が変化するようなものでもよい。
【００３６】
また、吸気孔５１と排気孔５２を、補強リブ１６の厚みの範囲内において、樹脂プーリ１３の回転方向に並んで配設してもよい。すなわち、吸気孔５１が樹脂プーリ１３の回転方向前方に傾斜し、排気孔５２が樹脂プーリ１３の回転方向後方に傾斜して設けられていてもよい。
【００３７】
さらに、樹脂プーリ１３の形状は、ウェブ１５の両面に補強リブ１６を一体成形したものに限らず、例えば、厚肉のフラットな円盤状であって、貫通孔あるいは通気孔を任意の位置に、任意の角度にて形成したものであってもよい。
【００３８】
【発明の効果】
本発明の樹脂プーリ付き軸受によれば、転がり軸受内部に熱がこもるのを防ぎ、長時間に渡り連続回転させても転がり軸受の温度上昇が抑制され、グリースの劣化を防止して軸受の寿命を向上させることができるという効果が得られる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態における樹脂プーリ付き軸受の部分断面図である。
【図２】本発明の第１の実施の形態における樹脂プーリ付き軸受の樹脂プーリの正面図である。
【図３】本発明の第１の実施の形態における樹脂プーリ付き軸受の断面図である。
【図４】本発明の第１の実施の形態における樹脂プーリ付き軸受の製造工程の断面図である。
【図５】本発明の第２の実施の形態における樹脂プーリ付き軸受の樹脂プーリの正面図である。
【図６】本発明の第２の実施の形態における樹脂プーリ付き軸受の断面図である。
【図７】本発明の第３の実施の形態における樹脂プーリ付き軸受の樹脂プーリの正面図である。
【図８】本発明の第３の実施の形態における樹脂プーリ付き軸受の断面図である。
【符号の説明】
１０樹脂プーリ付き軸受
１１外輪
１２外周面
１３樹脂プーリ
１４ベルト案内
１５ウェブ
１６補強リブ
１７貫通孔
４０，５０通気孔
４１，５１吸気孔
４２，５２排気孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing with a resin pulley suitable for use in a belt transmission mechanism, in particular, an auxiliary machine driving belt of an automobile.
[0002]
[Prior art]
Conventionally, pulleys used in accessory drive belts for transmitting engine rotational power to automobile auxiliary machinery have been designed to reduce the weight and cost of the outer peripheral surface of the metal outer ring of the rolling bearing. In addition, a bearing with a resin pulley formed by integrally molding a pulley made of synthetic resin is used. As the resin pulley, for example, a phenol resin having a high operating temperature range and thermosetting is used.
[0003]
[Problems to be solved by the invention]
The resin pulley is inferior in heat conductivity as compared with the iron pulley, and therefore has a poor heat dissipation property. Therefore, heat generated by the rotation of the rolling bearing is trapped in the rolling bearing. As a result, there has been a problem that the deterioration of the grease filled in the rolling bearing is promoted.
[0004]
An object of the present invention is to provide a bearing with a resin pulley that can prevent heat from being trapped inside a rolling bearing, suppress deterioration of grease, and improve the life of the bearing.
[0005]
[Means for Solving the Problems]
The bearing with a resin pulley according to claim 1 of the present invention is a bearing with a resin pulley in which a resin pulley is integrally formed by injection molding on an outer peripheral surface of an outer ring of a rolling bearing, and a through hole is formed in the resin pulley. The through hole has an opening at one end that opens to the inner circumferential surface of the resin pulley within the axial width range of the ball of the rolling bearing, and an opening at the other end that opens to the belt guide surface . The peripheral surface is in contact with the entire outer peripheral surface excluding a portion corresponding to the one end opening of the outer ring .
[0006]
The other end opening of the through hole on the belt guide surface side may be displaced forward in the rotational direction of the resin pulley. In addition, a plurality of through holes may be provided in the resin pulley, and each through hole may be evenly arranged with respect to the axis of the rolling bearing.
[0007]
As described above, since the through hole is formed in the resin pulley, the through hole is filled with air, and the thermal conductivity of the air is superior to the thermal conductivity of the resin. Therefore, the heat of the rolling bearing is transmitted through the air in the through hole and released from the belt guide surface, so that it is possible to prevent the heat from being accumulated inside the rolling bearing.
[0008]
Also, by shifting the other end opening of the through hole on the belt guide surface side forward in the rotational direction of the resin pulley, air can easily flow into the through hole, and heat radiation of the rolling bearing can be performed reliably.
[0009]
Furthermore, by disposing a plurality of through holes in the resin pulley evenly with respect to the axis of the rolling bearing, heat dissipation of the rolling bearing can be efficiently performed regardless of the temperature distribution.
[0010]
The bearing with a resin pulley according to claim 5 of the present invention is a bearing with a resin pulley in which a resin pulley is integrally formed by injection molding on the outer peripheral surface of an outer ring of a rolling bearing, and the resin pulley has an intake hole and an exhaust hole. The one end opening of the air intake hole opens on the inner peripheral surface of the resin pulley within the axial width range of the ball of the rolling bearing, and the other end opening on the belt guide surface. open, the exhaust hole is opened at the same position as the one end opening of the one end opening the intake hole, the other end opening is opened to differ from the other end opening of the suction holes of the belt guiding surface position, The inner peripheral surface of the resin pulley is in contact with the entire outer peripheral surface excluding a portion corresponding to one end opening of the intake hole and one end opening of the exhaust hole of the outer ring . For example, the intake hole and the exhaust hole may be arranged side by side in the rotational direction of the resin pulley, or may be arranged side by side in the axial direction of the rolling bearing.
[0011]
Note that the opening on the belt guide surface side of the intake hole may be displaced forward in the rotational direction of the resin pulley. Further, the resin pulley may be provided with a plurality of independent air holes, and each air hole may be evenly arranged with respect to the axis of the rolling bearing.
[0012]
As described above, since the air hole made up of the intake hole and the exhaust hole is formed in the resin pulley, the air hole is filled with air, and the thermal conductivity of the air is superior to the thermal conductivity of the resin. By forming the pores, the heat dissipation of the resin pulley is improved, so that the heat of the rolling bearing is released from the belt guide surface through the air in the vent hole, and it is possible to prevent the heat from being accumulated inside the rolling bearing.
[0013]
Further, as the rolling bearing rotates, air flows from the intake hole and is exhausted from the exhaust hole through the outer peripheral surface of the outer ring, so that the heat of the rolling bearing is released from the belt guide surface by the air flowing through the vent hole. Further, it is possible to further prevent heat from being accumulated inside the rolling bearing.
[0014]
Further, by deviating the opening portion on the belt guide surface side of the air intake hole toward the front in the rotational direction of the resin pulley, air can easily flow into the air hole, and the heat radiation of the rolling bearing can be reliably performed.
[0015]
Furthermore, by arranging a plurality of vent holes in the resin pulley evenly with respect to the axis of the rolling bearing, the rolling bearing can efficiently dissipate heat regardless of the temperature distribution.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.
[0017]
FIG. 1 is a partial sectional view of a bearing 10 with a resin pulley formed by integrally forming a pulley 13 made of synthetic resin on an outer peripheral surface 12 of an outer ring 11 of a rolling bearing. The outer peripheral surface of the resin pulley 13 is driven by an auxiliary machine. A belt guide surface 14 is provided on which a belt (not shown) is hung, and a through hole 17 is formed in the web 15 of the resin pulley 13. In addition, 16 is a reinforcing rib of the resin pulley 13, and is formed radially from the center at predetermined intervals on both sides of the web 15 in the axial direction.
[0018]
Next, the through hole 17 will be described in detail with reference to FIGS. 2 and 3.
[0019]
The through hole 17 is a linear hole having one end opened on the outer peripheral surface 12 of the outer ring 11 and the other end opened on the belt guide surface 14 of the resin pulley 13. Further, the through holes 17 are formed at four locations in the web 15 portion of the resin pulley 13 so as to be evenly arranged with respect to the axis C-C of the rolling bearing.
[0020]
Furthermore, each through-hole 17 has its opening on the belt guide surface 14 side displaced by a tilt angle θ forward of the resin pulley 13 in the rotation direction (arrow A direction). The inclination angle θ is set to an appropriate angle within the range of 5 ° to 45 °, for example, in which air easily flows into the through hole 17 when the resin pulley 13 rotates.
[0021]
Next, an operation for integrally molding the resin pulley 13 on the outer peripheral surface 12 of the outer ring 11 of the rolling bearing will be described with reference to FIG. The resin pulley 13 is formed by, for example, injection molding. That is, the rolling bearing or its outer ring 11 is centered and fixed in the mold 30, and the rod-shaped mold 34 is inserted at a predetermined angle into a position where the through-hole 17 is formed, and the tip is attached to the outer peripheral surface 12 of the outer ring 11. Make contact. Next, after filling the cavity 33 in the mold with the molten resin through the runner 31 and the resin injection gate 32 and solidifying it, the rod-shaped mold 34 is extracted and opened.
[0022]
Next, the heat radiation effect of the rolling bearing will be described. That is, with the rotation of the resin pulley 13, air flows into the through hole 17 from the opening on the belt guide surface 14 side of the through hole 17 that is displaced forward by the inclination angle θ in the rotation direction of the resin pulley 13. The through hole 17 communicates between the outer peripheral surface 12 of the outer ring 11 and the belt guide surface 14, and heat generated by the rotation of the rolling bearing is transmitted from the belt guide surface 14 through the air in the through hole 17. Prevents heat from accumulating inside the rolling bearing.
[0023]
The number of through holes 17 is not particularly limited, and may be one or a plurality of two or more. Further, the through hole 17 is not inclined forward in the rotational direction of the resin pulley 13 and may be formed radially with respect to the axis C-C, or formed in the reinforcing rib 16 portion of the resin pulley 13. Also good. Further, the through hole 17 is not limited to a straight line shape, and may have a diameter that changes midway so that intake can be smoothly performed due to a pressure difference, and the belt guide surface 14 side so that air can easily flow in. A recess or the like for guiding air to the inside may be formed in the opening.
(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS.
[0024]
This embodiment, the resin pulley 13, one end of the suction pores 41 opened to the outer peripheral surface 12 of the opening to the other end the outer ring 11 in the belt guide surface 14, one end of the outer ring outer circumferential surface of the suction hole 41 opening the other end communicating with the part is made by forming a vent hole 40 consisting of discharge pores 42 opened in the belt guide surface 14, the exhaust hole 42 and the intake hole 41, distribution aligned in the rotational direction of the resin pulley 13 It is installed.
[0025]
The vent holes 40 are formed at four locations in the web 15 portion of the resin pulley 13 so as to be evenly arranged with respect to the axis C-C of the rolling bearing. In addition, the air intake hole 41 of each vent hole 40 has an inclination angle θ, for example, 5 ° to 45 °, at which the opening on the belt guide surface 14 side is easy to allow air to flow forward in the rotational direction of the resin pulley 13 (arrow A direction) Only deviated. The inclination angle of the exhaust hole 42 is not particularly limited.
[0026]
The operation of integrally forming the resin pulley 13 on the outer peripheral surface 12 of the outer ring 11 of the rolling bearing is a pair of rods for forming the intake holes 41 and the exhaust holes 42 in the mold as in the first embodiment. It is performed by injection molding with a mold inserted and filled / solidified with molten resin.
[0027]
Next, the heat radiation effect of the rolling bearing will be described. That is, as the resin pulley 13 rotates, air flows into the vent hole 40 from the opening on the belt guide surface 14 side of the intake hole 41 that is displaced forward by the inclination angle θ in the rotation direction of the resin pulley 13. The vent hole 40 communicates between the outer peripheral surface 12 of the outer ring 11 and the belt guide surface 14, and heat generated by the rotation of the rolling bearing is released from the belt guide surface 14 through the air in the vent hole 40. Prevents heat from accumulating inside the rolling bearing.
[0028]
Further, with the rotation of the rolling bearing, air flows into the intake hole 41 from the opening on the belt guide surface 14 side, passes through the outer peripheral surface 12 of the outer ring 11, and the opening on the belt guide surface 14 side of the exhaust hole 42. As a result, the heat of the bearing is released from the belt guide surface 14 by the air flowing through the vent hole 40, and it is possible to further prevent the heat from being accumulated inside the rolling bearing.
[0029]
The number of vent holes 40 is not particularly limited, and may be one or a plurality of two or more. Further, the intake holes 41 are not inclined and may be formed radially with respect to the axis C-C. In addition, the intake holes 41 and the exhaust holes 42 are not limited to straight lines, and may have diameters that change midway so that intake and exhaust can be smoothly performed due to a pressure difference, and air can easily flow in. A recess or the like for guiding air to the inside may be formed in the opening on the belt guide surface 14 side of the intake hole 41. Further, the exhaust hole 42 may be formed in the reinforcing rib 16. (Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS.
[0030]
This embodiment, the resin pulley 13, one end of the suction pores 51 which are opened and the other end in the belt guide surface 14 is open to the outer peripheral surface 12 of the outer ring 11, one end of the outer ring outer circumferential surface of the suction hole 51 opening the other end communicating with the part is made by forming a vent hole 50 of the discharge pores 52 opened in the belt guide surface 14, the exhaust hole 52 and the intake hole 51, distribution aligned in the axial direction of the rolling bearing It is installed.
[0031]
The vent holes 50 are formed at four locations in the reinforcing rib 16 portion of the resin pulley 13 so as to be evenly arranged with respect to the axis CC of the rolling bearing. A recess for guiding air to the inside is formed in the opening on the side of the belt guide surface 14 of the intake hole 51.
[0032]
The operation of integrally forming the resin pulley 13 on the outer peripheral surface 12 of the outer ring 11 of the rolling bearing is a pair of rods for forming the intake holes 51 and the exhaust holes 52 in the mold as in the first embodiment. It is performed by injection molding with a mold inserted and filled / solidified with molten resin.
[0033]
Next, the heat radiation effect of the rolling bearing will be described. That is, with the rotation of the resin pulley 13, air flows into the vent hole 50 from the opening on the belt guide surface 14 side of the intake hole 51. The air hole 50 communicates between the outer peripheral surface 12 of the outer ring 11 and the belt guide surface 14, and heat generated by the rotation of the rolling bearing is released from the belt guide surface 14 through the air in the air hole 50. Prevents heat from accumulating inside the rolling bearing.
[0034]
Further, as the rolling bearing rotates, air flows into the intake hole 51 from the opening on the belt guide surface 14 side, passes through the outer peripheral surface 12 of the outer ring 11, and the opening on the belt guide surface 14 side of the exhaust hole 52. Therefore, the heat of the bearing is released from the belt guide surface 14 by the air flowing through the air holes 50, and the heat can be further prevented from being accumulated inside the rolling bearing.
[0035]
The number of vent holes 50 is not particularly limited, and may be one or a plurality of two or more. Further, the intake holes 51 and the exhaust holes 52 are not limited to a straight line, and may have a diameter that changes midway so that intake and exhaust can be smoothly performed due to a pressure difference.
[0036]
Further, the intake hole 51 and the exhaust hole 52 may be arranged side by side in the rotational direction of the resin pulley 13 within the range of the thickness of the reinforcing rib 16. In other words, the intake hole 51 may be inclined to the front in the rotational direction of the resin pulley 13 and the exhaust hole 52 may be inclined to the rear in the rotational direction of the resin pulley 13.
[0037]
Further, the shape of the resin pulley 13 is not limited to the one in which the reinforcing ribs 16 are integrally formed on both surfaces of the web 15, for example, a thick flat disk shape, and the through hole or the vent hole is at an arbitrary position. It may be formed at an arbitrary angle.
[0038]
【The invention's effect】
According to the bearing with a resin pulley of the present invention, heat is prevented from being accumulated inside the rolling bearing, and the temperature rise of the rolling bearing is suppressed even if the rolling bearing is continuously rotated for a long time. The effect that can be improved is obtained.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a bearing with a resin pulley according to a first embodiment of the present invention.
FIG. 2 is a front view of the resin pulley of the bearing with the resin pulley in the first embodiment of the present invention.
FIG. 3 is a cross-sectional view of a bearing with a resin pulley according to the first embodiment of the present invention.
FIG. 4 is a cross-sectional view of the manufacturing process of the bearing with the resin pulley in the first embodiment of the present invention.
FIG. 5 is a front view of a resin pulley of a bearing with a resin pulley according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view of a bearing with a resin pulley according to a second embodiment of the present invention.
FIG. 7 is a front view of a resin pulley of a bearing with a resin pulley according to a third embodiment of the present invention.
FIG. 8 is a cross-sectional view of a bearing with a resin pulley according to a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Bearing 11 with resin pulley Outer ring 12 Outer peripheral surface 13 Resin pulley 14 Belt guide 15 Web 16 Reinforcement rib 17 Through hole 40, 50 Vent hole 41, 51 Intake hole 42, 52 Exhaust hole

Claims

A bearing with a resin pulley in which a resin pulley is integrally formed by injection molding on an outer peripheral surface of an outer ring of a rolling bearing,
A through hole is formed in the resin pulley ,
The through hole is
One end opening opens to the inner peripheral surface of the resin pulley within the axial width range of the ball of the rolling bearing ,
The other end opening opens to the belt guide surface ,
A bearing with a resin pulley, wherein the inner peripheral surface of the resin pulley is in contact with the entire outer peripheral surface excluding a portion corresponding to the one end opening of the outer ring .

The bearing with a resin pulley according to claim 1, wherein the other end opening of the through hole on the belt guide surface side is displaced forward in the rotational direction of the resin pulley.

The bearing with a resin pulley according to claim 1 or 2, wherein the resin pulley has a plurality of through holes.

4. A bearing with a resin pulley according to claim 3, wherein each of the through holes is arranged uniformly with respect to the axis of the rolling bearing.

A bearing with a resin pulley in which a resin pulley is integrally formed by injection molding on an outer peripheral surface of an outer ring of a rolling bearing,
In the resin pulley, a ventilation hole composed of an intake hole and an exhaust hole is formed,
The intake hole is
One end opening opens to the inner peripheral surface of the resin pulley within the axial width range of the ball of the rolling bearing ,
The other end opening opens to the belt guide surface ,
The exhaust hole is
One end opening is opened at the same position as the one end opening of the intake hole ,
The other end opening is opened at a position different from the other end opening of the intake hole of the belt guide surface ,
A bearing with a resin pulley, wherein the inner peripheral surface of the resin pulley is in contact with the entire outer peripheral surface excluding a portion corresponding to one end opening of the intake hole and one end opening of the exhaust hole of the outer ring .

6. The bearing with a resin pulley according to claim 5, wherein the intake hole and the exhaust hole are arranged side by side in the rotation direction of the resin pulley.

The bearing with a resin pulley according to claim 5, wherein the intake hole and the exhaust hole are arranged side by side in the axial direction of the rolling bearing.

6. The bearing with a resin pulley according to claim 5, wherein the other end opening of the suction hole on the belt guide surface side is deviated forward in the rotational direction of the resin pulley.

9. A bearing with a resin pulley according to claim 5, wherein the resin pulley is provided with a plurality of independent air holes.

10. A bearing with a resin pulley according to claim 9, wherein each air hole is evenly arranged with respect to the axis of the rolling bearing.