JP3307182B2 - Sintered bearing and manufacturing method thereof - Google Patents
Sintered bearing and manufacturing method thereofInfo
- Publication number
- JP3307182B2 JP3307182B2 JP22237395A JP22237395A JP3307182B2 JP 3307182 B2 JP3307182 B2 JP 3307182B2 JP 22237395 A JP22237395 A JP 22237395A JP 22237395 A JP22237395 A JP 22237395A JP 3307182 B2 JP3307182 B2 JP 3307182B2
- Authority
- JP
- Japan
- Prior art keywords
- peripheral surface
- bearing
- diameter
- sintered
- cylindrical
- 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 - Fee Related
Links
Landscapes
- Sliding-Contact Bearings (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、焼結軸受およびそ
の製造方法に関するものである。The present invention relates to a sintered bearing and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】多孔質状の焼結合金により成形され潤滑
油を含浸させた筒状焼結体を用いた焼結含油軸受は、無
給油で長時間使用することができ、高温での耐久性に優
れ、低騒音であることから、ボールベアリングに代わる
回転軸の軸受として広く使用されている。2. Description of the Related Art A sintered oil-impregnated bearing using a cylindrical sintered body formed of a porous sintered alloy and impregnated with lubricating oil can be used for a long time without lubrication, and is durable at high temperatures. Because of its excellent performance and low noise, it is widely used as a bearing for rotating shafts instead of ball bearings.
【０００３】このような焼結含油軸受は、前記筒状焼結
体の内部に形成されている気孔内に潤滑油を含浸させ該
潤滑油を保持することにより、筒状焼結体の内面に摺動
状態に貫通された回転軸との間に油膜を形成して、長期
にわたり潤滑状態を維持することができるようになって
いる。[0003] In such a sintered oil-impregnated bearing, the pores formed inside the cylindrical sintered body are impregnated with lubricating oil to retain the lubricating oil. An oil film is formed between the sliding shaft and the rotating shaft, so that the lubricating state can be maintained for a long time.
【０００４】従来、高い支持力が得られる軸受として、
軸方向に離間した２カ所の摺動面により回転軸を支持す
るいわゆるツインベアリング方式の軸受が用いられてい
る。このツインベアリング方式は、特に、回転軸を片持
ち状態で支持する際の回転振れを防ぐ場合等に用いられ
ている。この方式は、２つに離間・分割された摺動面で
回転軸を支持することにより、一つの軸受で回転軸の回
転振れ等を防止することができるとともに、両摺動面の
間に逃げ部を形成することにより、回転軸との接触面積
を少なくして摩擦抵抗を低減させている。Conventionally, as a bearing capable of obtaining a high supporting force,
A so-called twin bearing type bearing in which a rotating shaft is supported by two sliding surfaces separated in the axial direction is used. This twin-bearing method is used particularly for preventing rotational runout when the rotating shaft is supported in a cantilever state. In this method, the rotating shaft is supported by two separate and divided sliding surfaces, so that one bearing can prevent rotational runout of the rotating shaft, etc. By forming the portion, the contact area with the rotating shaft is reduced, and the frictional resistance is reduced.
【０００５】このツインベアリング方式としては、例え
ば、ハウジングの軸受挿入孔に、短円筒状の２つの軸受
を軸方向に離間状態に配したものや、特開昭５８−８４
２２２号公報に開示されている軸受、すなわち長円筒状
の焼結体の内面中央部に逃げ部が設けられている焼結含
油軸受等が知られている。As the twin bearing system, for example, two short cylindrical bearings are disposed in a bearing insertion hole of a housing so as to be spaced apart from each other in the axial direction.
A bearing disclosed in Japanese Patent Publication No. 222, i.e., a sintered oil-impregnated bearing in which a relief portion is provided at the center of the inner surface of a long cylindrical sintered body is known.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記前
者の場合は、２つの軸受の２点で回転軸を支持すること
により、回転振れ等を防止することができるが、部品点
数が多くなってしまうとともに、組立に時間がかかって
しまう。一方、後者の軸受の場合は、回転軸を片持ちし
た状態において、回転軸を２カ所で支持する場合に比べ
て強い力が加わるため、高強度の軸受を必要とする。こ
の場合には、焼結体である軸受の密度を高めて強度を高
める方法が考えられるが、高密度になるほど内部の気孔
率が低下するとともに、含油率も低下するため、軸受の
寿命が短くなってしまう。However, in the case of the former, the rotational shaft can be prevented by supporting the rotary shaft at two points of the two bearings, but the number of parts increases. At the same time, it takes time to assemble. On the other hand, in the case of the latter bearing, when the rotating shaft is cantilevered, a stronger force is applied than when the rotating shaft is supported at two places, so a high-strength bearing is required. In this case, it is conceivable to increase the density of the sintered bearing to increase its strength.However, the higher the density, the lower the internal porosity and the lower the oil content. turn into.
【０００７】また、この軸受は、一つの軸受で高い支持
力を得ることができるが、摩擦抵抗を低減させるために
逃げ部を形成しなければならない。このため、該逃げ部
の形成方法として、例えば、円筒状に成形した後の円筒
状焼結体の内面に、機械加工による旋削を施して逃げ部
を形成する方法や前記特開昭５８−８４２２２号公報に
記載された製造方法によって逃げ部を形成する方法等が
ある。Further, this bearing can obtain a high supporting force with one bearing, but it must form a relief portion in order to reduce frictional resistance. For this reason, as a method for forming the clearance, for example, a method in which the inner surface of the cylindrical sintered body after being formed into a cylindrical shape is subjected to turning by machining to form a clearance, and the method described in Japanese Patent Application Laid-Open No. 58-84222. There is a method of forming a relief portion by a manufacturing method described in Japanese Patent Application Laid-Open Publication No. H11-163,036.
【０００８】前者の形成方法では、製造工程数が増大し
て、高コスト化を招いてしまうとともに、軸受の内面に
切粉が残存するおそれがあり、回転軸の回転に摩擦等の
悪影響を及ぼす場合がある。また、後者の形成方法によ
り製造した軸受をハウジング内に取り付ける場合には、
軸受の外径中央部が膨出して円環状の突条部が形成され
ているので、この部分を削ってハウジングに挿入する
か、ハウジング自体を２以上の分割構造として、軸受を
はめ込む必要がある。したがって、軸受の切削工程の追
加、もしくは、分割されたハウジングによる部品点数の
増加を招いてしまう。In the former forming method, the number of manufacturing steps is increased, which leads to an increase in cost, and there is a possibility that chips may remain on the inner surface of the bearing and adversely affect the rotation of the rotating shaft such as friction. There are cases. When mounting the bearing manufactured by the latter forming method in the housing,
Since the central part of the outer diameter of the bearing bulges to form an annular ridge, it is necessary to cut this part and insert it into the housing, or to fit the bearing into the housing itself with two or more divided structures. . Accordingly, an additional step of cutting the bearing or an increase in the number of parts due to the divided housing is caused.
【０００９】本発明は、前述の課題に鑑みてなされたも
ので、一つの筒状焼結体で回転軸の高い支持力を得るこ
とができるとともに、高強度と高含油率を有し、一体構
造のハウジングに容易に組み込むことができる焼結軸受
およびその製造方法を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a single cylindrical sintered body can obtain a high supporting force of a rotating shaft, has a high strength and a high oil content, and has an integral structure. An object of the present invention is to provide a sintered bearing which can be easily incorporated into a housing having a structure, and a method for manufacturing the same.
【００１０】[0010]
【課題を解決するための手段】本発明は、前記課題を解
決するために以下の構成を採用した。すなわち、請求項
１記載の焼結軸受では、焼結合金により筒状に形成され
た焼結軸受であって、その一端部および他端部は、その
内周面がそれぞれ回転軸を摺動自在に支持する第１摺動
面および第２摺動面とされるとともに、一端部と他端部
との間の中央部の内周面に、周方向に沿って円環状に凹
んだ逃げ部が形成されてなり、前記他端部は、一端部よ
り高密度であると共に、その外周面に軸方向に沿って複
数の突条部が形成され、これら突条部の上面には、前記
一端部の外周面と面一なガイド面が形成されている技術
が採用される。この焼結軸受では、他端部が一端部より
高密度に形成されているので、一端部より気孔率が低下
するが高い強度を有し、潤滑油に含浸させると、一端部
は他端部より高い含油率を有する。したがって、回転軸
の一端側に本発明の焼結軸受を片持ち状態で取り付ける
場合に、他端部を回転軸の他端側に向けて配すると、他
端部が高強度であるので、他端側に接続された負荷源か
らの強い力が軸受に加わっても高い支持力が得られる。
さらに、一端部は高い含油率を有することができるの
で、他端部に対して潤滑油の供給が行われる。The present invention has the following features to attain the object mentioned above. That is, the sintered bearing according to the first aspect is a sintered bearing formed of a sintered alloy in a cylindrical shape, and one end and the other end of the sintered bearing are each slidable on the rotating shaft. The first sliding surface and the second sliding surface are supported on the inner peripheral surface of the central portion between the one end and the other end. The other end has a higher density than the one end, and has an outer circumferential surface that is formed along the axial direction.
Number of ridges are formed, and the upper surface of these ridges is
A technique in which a guide surface flush with the outer peripheral surface of one end is formed is employed. In this sintered bearing, the other end is formed at a higher density than the one end, so that the porosity is lower than the one end, but has a high strength. Has a higher oil content. Therefore, when the sintered bearing of the present invention is mounted on one end of the rotating shaft in a cantilever state, if the other end is arranged toward the other end of the rotating shaft, the other end has high strength. Even if a strong force from a load source connected to the end is applied to the bearing, a high supporting force can be obtained.
Furthermore, since one end can have a high oil content, lubricating oil is supplied to the other end.
【００１１】また、この焼結軸受では、複数の突条部の
ガイド面がハウジングに圧入する際のガイドとなる。Further , in this sintered bearing, the guide surfaces of the plurality of ridges serve as guides when press-fitting the housing.
【００１２】請求項２記載の焼結軸受の製造方法では、
一端部の内周面が回転軸を摺動自在に支持する第１摺動
面とされかつ中央部および他端部の内径が一端部より大
きく設定された筒状焼結体を形成しておき、該筒状焼結
体に円柱状のコアロッドを挿入し、この挿入状態で他端
部の外周面を他端部加圧手段によって内方に向けて加圧
することにより、該他端部を縮径させてその内周面を回
転軸を摺動自在に支持する第２摺動面とするとともに、
中央部の内周面に周方向に沿って円環状に凹んだ逃げ部
を形成し、このとき他端部を、一端部より高密度とする
と共に、その外周面に軸方向に沿って複数の突条部を形
成し、これら突条部の上面に、前記一端部の外周面と面
一なガイド面を形成する技術が採用される。この焼結軸
受の製造方法では、他端部加圧手段で、他端部に縮径を
施して第２摺動面を形成して、同時に中央部に逃げ部が
形成される。また、他端部のみを圧縮加工するので、該
他端部は一端部より高密度化されるとともに、突条部の
上面に、一端部の外周面と面一なガイド面を形成するの
で、ハウジングへの取付に際して妨げとなる外周面の突
部等が形成されない。In the method for manufacturing a sintered bearing according to the second aspect,
An inner peripheral surface of one end is a first sliding surface slidably supporting the rotating shaft, and a cylindrical sintered body is formed in which the inner diameters of the central portion and the other end are set to be larger than those of the one end. By inserting a cylindrical core rod into the cylindrical sintered body and pressing the outer peripheral surface of the other end inward by the other end pressing means in this inserted state, the other end is contracted. And the inner peripheral surface is used as a second sliding surface for slidably supporting the rotating shaft.
Forming an annular recessed part along the circumferential direction on the inner peripheral surface of the central part, making the other end denser than the one end
At the same time, multiple ridges are formed on the outer peripheral surface along the axial direction.
The outer peripheral surface of the one end portion and the surface
A technique for forming a single guide surface is employed. In this method for manufacturing a sintered bearing, the other end pressing means reduces the diameter of the other end to form a second sliding surface, and at the same time, forms a relief in the center. Also, since only the other end is subjected to compression processing, the other end has a higher density than the one end , and has
Form a guide surface on the upper surface that is flush with the outer peripheral surface of one end.
Of the outer peripheral surface, which hinders the attachment to the housing.
No part is formed.
【００１３】請求項３記載の焼結軸受の製造方法では、
請求項２記載の焼結軸受の製造方法において、前記他端
部加圧手段は、前記筒状焼結体の他端部の外径より小さ
い内径の成形穴を有するダイに筒状焼結体の他端部を押
し込んで縮径させるダイ加工である技術が採用される。
この焼結軸受の製造方法では、ダイによって他端部を縮
径させるので、他端部の縮径工程にかかる時間が短く、
量産性が向上する。According to a third aspect of the present invention, there is provided a method for manufacturing a sintered bearing.
3. The method for manufacturing a sintered bearing according to claim 2 , wherein said other end pressing means is formed in a die having a molding hole having an inner diameter smaller than an outer diameter of the other end of said cylindrical sintered body. The technique is a die processing in which the other end is pushed in to reduce the diameter.
In this method for manufacturing a sintered bearing, since the other end is reduced in diameter by the die, the time required for the step of reducing the diameter of the other end is short,
Mass productivity is improved.
【００１４】[0014]
【００１５】請求項４記載の焼結軸受の製造方法では、
請求項２又は３に記載の焼結軸受の製造方法において、
縮径される前の前記他端部の外径は一端部の外径より大
きく設定され、前記加圧時に他端部を一端部と同じ外径
に縮径する技術が採用される。この焼結軸受の製造方法
では、加圧時に他端部が圧縮加工されるとともに、一端
部と同じ外径となるまで縮径することにより、他端部の
外周面が一端部の外周面と面一に形成される。According to a fourth aspect of the present invention, there is provided a method for manufacturing a sintered bearing.
The method for producing a sintered bearing according to claim 2 or 3 ,
The outer diameter of the other end before being reduced is set to be larger than the outer diameter of the one end, and a technique is employed in which the other end is reduced to the same outer diameter as the one end during the pressurization. In this method of manufacturing a sintered bearing, the other end is compressed during pressurization, and is reduced in diameter until it has the same outer diameter as the one end, so that the outer peripheral surface of the other end is in contact with the outer peripheral surface of the one end. It is formed flush.
【００１６】[0016]
【発明の実施の形態】以下、本発明に係る焼結軸受の製
造方法における実施の第１形態について、図１を参照し
ながら説明する。この図にあって、符号１は筒状焼結
体、２はダイ、３はコアロッド、４は上パンチを示して
いる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a method for manufacturing a sintered bearing according to the present invention will be described below with reference to FIG. In this figure, reference numeral 1 denotes a cylindrical sintered body, 2 denotes a die, 3 denotes a core rod, and 4 denotes an upper punch.
【００１７】筒状焼結体１は、図１の（ａ）に示すよう
に、多孔質状の焼結合金により成形された円筒状の焼結
体であり、その一端部１Ａの内周面が回転軸を摺動自在
に支持する第１摺動面１ａとされかつ中央部１Ｂおよび
他端部１Ｃの内径が一端部１Ａより大きく設定されてい
る。As shown in FIG. 1A, the cylindrical sintered body 1 is a cylindrical sintered body formed of a porous sintered alloy, and has an inner peripheral surface at one end 1A. Is a first sliding surface 1a that slidably supports the rotating shaft, and the inner diameter of the central portion 1B and the other end 1C is set to be larger than that of the one end 1A.
【００１８】前記筒状焼結体１を、図１の（ｂ）に示す
ように、他端部１Ｃを下方に向けて、他端部１Ｃの外周
面に軸線を同じくして配したダイ２上に配置するととも
に、筒状焼結体１およびダイ２に、一端部１Ａの内径と
同じ外径に設定された円柱状のコアロッド３を挿入す
る。前記ダイ２は、他端部１Ｃの外径より小さい内径の
成形穴を有し、他端方向に漸次内径が狭められた縮径部
分２ａを有する円環状の成形金型である。ダイ２におけ
る最小径部２ｂとコアロッド３の外径部との間隔は、他
端部１Ｃの厚さより狭く設定されている。As shown in FIG. 1 (b), a die 2 in which the other end 1C is directed downward and the cylindrical sintered body 1 is arranged on the outer peripheral surface of the other end 1C with the same axis. A cylindrical core rod 3 having the same outer diameter as the inner diameter of one end 1A is inserted into the cylindrical sintered body 1 and the die 2 while being disposed on the upper side. The die 2 is an annular molding die having a molding hole having an inner diameter smaller than the outer diameter of the other end 1C and having a reduced diameter portion 2a whose inner diameter is gradually narrowed in the other end direction. The distance between the minimum diameter portion 2b of the die 2 and the outer diameter portion of the core rod 3 is set smaller than the thickness of the other end 1C.
【００１９】次に、一端部１Ａの内径と同じ外径を有す
る円筒状の上パンチ４によって筒状焼結体１の上端を軸
方向に押圧するとともに、他端部１Ｃをダイ２に押し込
んで、筒状焼結体１の下端がダイ２の底部に達するまで
ダイ加工を施す。このとき、他端部１Ｃの外周面は、縮
径部分２ａで内方に向けて加圧されて徐々に縮径され
る。そして、最小径部２ｂでは、他端部１Ｃの内周面が
コアロッド３に支持されて、他端部１Ｃが一端部１Ａと
同じ内径に縮径される。この他端部１Ｃの内周面は、回
転軸を摺動自在に支持する第２摺動面１ｃとされる。ま
た、同時に、中央部１Ｂに一端部１Ａおよび他端部１Ｃ
より大きな内径を有し、内周面に周方向に沿って円環状
に凹んだ逃げ部１ｂが形成される。Next, the upper end of the cylindrical sintered body 1 is axially pressed by the cylindrical upper punch 4 having the same outer diameter as the inner diameter of the one end 1A, and the other end 1C is pressed into the die 2. Then, die processing is performed until the lower end of the cylindrical sintered body 1 reaches the bottom of the die 2. At this time, the outer peripheral surface of the other end 1C is pressed inward by the reduced diameter portion 2a and gradually reduced in diameter. In the minimum diameter portion 2b, the inner peripheral surface of the other end 1C is supported by the core rod 3, and the other end 1C is reduced in diameter to the same inner diameter as the one end 1A. The inner peripheral surface of the other end 1C is a second sliding surface 1c that slidably supports the rotating shaft. At the same time, one end 1A and the other end 1C are connected to the center 1B.
A relief portion 1b having a larger inner diameter and being annularly concave along the circumferential direction is formed on the inner peripheral surface.
【００２０】通常の焼結軸受における密度は、Ｆｅ系の
軸受材料の場合、６．６×１０3ｋｇ／ｃｍ3であるが、
上記の方法によって加工した筒状焼結体１では、一端部
１Ａを通常の６．６×１０3ｋｇ／ｃｍ3としたのに対し
て、他端部１Ｃを６．８×１０3ｋｇ／ｃｍ3の高密度と
した。The density of a normal sintered bearing is 6.6 × 10 3 kg / cm 3 in the case of a Fe-based bearing material.
In the cylindrical sintered body 1 processed by the above method, one end 1A is set to a normal 6.6 × 10 3 kg / cm 3 , while the other end 1C is set to 6.8 × 10 3 kg / cm 3. The density was cm 3 .
【００２１】このように筒状焼結体１を加工した焼結軸
受は、潤滑油を含浸させて焼結含油軸受とした後、ハウ
ジング（図示せず）内に圧入によって取り付けられる。
この焼結含油軸受の他端部１Ｃは、一端部１Ａより高密
度のため、気孔率が低下するが高い強度を有し、逆に、
一端部１Ａは、他端部１Ｃより高い含油率を有する。し
たがって、回転軸の一端側に本発明の焼結含油軸受を片
持ち状態で取り付ける場合に、他端部１Ｃを回転軸の他
端側に向けて配すると、他端部１Ｃが高強度であるの
で、他端側に接続された負荷源、例えばギヤ等の負荷が
伝達され強い力が軸受に加わっても高い支持力が得られ
る。さらに、一端部１Ａは高い含油率を有するので、他
端部１Ｃに対して潤滑油の供給が行われる。なお、前述
した２つの軸受を軸方向に離間状態に配したツインベア
リング方式の場合、一方を高密度に焼結すれば同様に高
い強度を有することができるが、密度の異なる軸受を２
種類作製しなければならず、部品点数の増大を招いてし
まう。The sintered bearing obtained by processing the cylindrical sintered body 1 as described above is impregnated with a lubricating oil to form a sintered oil-impregnated bearing, and then mounted by press-fitting into a housing (not shown).
Since the other end 1C of the sintered oil-impregnated bearing has a higher density than the one end 1A, the porosity is reduced but the strength is high.
One end 1A has a higher oil content than the other end 1C. Therefore, when the sintered oil-impregnated bearing of the present invention is attached to one end of the rotating shaft in a cantilever state, if the other end 1C is arranged toward the other end of the rotating shaft, the other end 1C has high strength. Therefore, even if a load source connected to the other end, for example, a load of a gear or the like is transmitted and a strong force is applied to the bearing, a high supporting force can be obtained. Further, since the one end 1A has a high oil content, lubricating oil is supplied to the other end 1C. In the case of the twin bearing system in which the two bearings described above are arranged in a state of being spaced apart in the axial direction, if one of them is sintered at a high density, the same high strength can be obtained.
It is necessary to manufacture different types, which leads to an increase in the number of parts.
【００２２】次に、本発明に係る焼結軸受の製造方法に
おける実施の第２形態について、図２および図３を参照
して説明する。Next, a second embodiment of the method for manufacturing a sintered bearing according to the present invention will be described with reference to FIGS.
【００２３】第２形態と第１形態との異なる点は、他端
部加圧手段に用いるダイの形状が異なる点である。すな
わち、第２形態のダイ５は、図２に示すように、第１形
態のダイ２に、その内周面に軸方向に沿って複数の突部
形成用溝５ａが形成され、これらの突部形成用溝５ａ
は、ダイ５の軸線と同じくして配される他端部１Ｃの外
周面より外側まで深く形成されている。The difference between the second embodiment and the first embodiment is that the shape of the die used for the other end pressing means is different. That is, as shown in FIG. 2, the die 5 of the second embodiment has a plurality of protrusion-forming grooves 5a formed on the inner peripheral surface of the die 2 of the first embodiment along the axial direction. Part forming groove 5a
Are formed deeper than the outer peripheral surface of the other end portion 1C arranged in the same manner as the axis of the die 5.
【００２４】このダイ５によって、第１形態と同様に、
筒状焼結体１の他端部１Ｃを加圧して縮径を行うと、図
３に示すように、突部形成用溝５ａの底部５ｂが他端部
１Ｃの外周面と非接触状態とされて該外周面に軸方向に
沿った複数の突条部６ａが形成された焼結軸受６が得ら
れる。With this die 5, as in the first embodiment,
When the other end 1C of the cylindrical sintered body 1 is pressed to reduce the diameter, as shown in FIG. 3, the bottom 5b of the protrusion forming groove 5a is brought into a non-contact state with the outer peripheral surface of the other end 1C. As a result, a sintered bearing 6 having a plurality of ridges 6a formed on the outer peripheral surface along the axial direction is obtained.
【００２５】この焼結軸受６は、突条部６ａの上面に、
一端部１Ａの外周面と面一なガイド面Ｇが形成されてい
るので、潤滑油を含浸させてハウジングに圧入する際
に、ガイドとなり、スムーズに圧入を行うことができる
とともに、ハウジングへの組み込み後は、他端部１１Ｃ
とハウジングとの支持部となる。The sintered bearing 6 is provided on the upper surface of the ridge 6a.
The guide surface G, which is flush with the outer peripheral surface of the one end 1A, is formed as a guide when the lubricating oil is impregnated into the housing and press-fitted into the housing. After that, the other end 11C
And the housing.
【００２６】次に、本発明に係る焼結軸受の製造方法に
おける実施の第３形態について、図４を参照して説明す
る。この図にあって、符号７はコアロッド、８は上部支
持部材、９は成形ロールを示している。Next, a third embodiment of the method for manufacturing a sintered bearing according to the present invention will be described with reference to FIG. In this figure, reference numeral 7 denotes a core rod, 8 denotes an upper support member, and 9 denotes a forming roll.
【００２７】第３形態と第１形態および第２形態との異
なる点は、他端部加圧手段として第１形態および第２形
態がダイ加工を用いたのに対し、第３形態ではロール加
工を用いた点である。すなわち、第１形態および第２形
態と同様の筒状焼結体１に、他端部１Ｃを下方に向けた
状態で、一端部１Ａの内径と同じ外径に設定された円柱
状のコアロッド７を挿入する。このとき、筒状焼結体１
の下端は、コアロッド７の外周部に段部状に形成された
下端係止部７ａによって支持される。また、筒状焼結体
１の上端には、筒状焼結体１と同じ軸線を有する円筒状
の上部支持部材８が嵌合状態に配される。該上部支持部
材８とコアロッド７とによって、加工時に筒状焼結体１
が回転および傾斜しないように挟持されている。The difference between the third embodiment and the first and second embodiments is that the first and second embodiments use die machining as the other end pressing means, whereas the third embodiment employs roll machining. This is the point that was used. That is, a cylindrical core rod 7 having the same outer diameter as the inner diameter of one end 1A is placed on the same cylindrical sintered body 1 as in the first and second embodiments, with the other end 1C facing downward. Insert At this time, the cylindrical sintered body 1
Is supported by a lower end locking portion 7 a formed in a stepped shape on the outer peripheral portion of the core rod 7. A cylindrical upper support member 8 having the same axis as that of the cylindrical sintered body 1 is arranged on the upper end of the cylindrical sintered body 1 in a fitted state. The cylindrical sintered body 1 is formed by the upper support member 8 and the core rod 7 during processing.
Are held so as not to rotate and tilt.
【００２８】この状態で、駆動源（図示せず）に接続さ
れた回転ロッド９ａに支持され外周部が段付形状とされ
た円盤状の成形ロール９を、他端部１Ｃの外周面に当接
し、その軸線回りに回転させながら加圧して、他端部１
Ｃを縮径する。このとき、成形ロール９によって、他端
部１Ｃの外周面が、内方に向けて加圧されて徐々に縮径
される。そして、他端部１Ｃの内周面がコアロッド７に
支持されて、他端部１Ｃが一端部１Ａと同じ内径に縮径
される。したがって、前述した第１形態と同様に、他端
部１Ｃの内周面は、回転軸を摺動自在に支持する第２摺
動面１ｃとされ、同時に、中央部１Ｂに一端部１Ａおよ
び他端部１Ｃより大きな内径を有する逃げ部１ｂが形成
される。In this state, a disk-shaped forming roll 9 supported by a rotating rod 9a connected to a driving source (not shown) and having a stepped outer peripheral portion is applied to the outer peripheral surface of the other end 1C. Contact and pressurize while rotating around its axis, the other end 1
C is reduced in diameter. At this time, the outer peripheral surface of the other end 1 </ b> C is pressed inward by the forming roll 9 and gradually reduced in diameter. Then, the inner peripheral surface of the other end 1C is supported by the core rod 7, and the other end 1C is reduced in diameter to the same inner diameter as the one end 1A. Therefore, similarly to the first embodiment described above, the inner peripheral surface of the other end 1C is a second sliding surface 1c that slidably supports the rotating shaft, and at the same time, the one end 1A and the other An escape portion 1b having an inner diameter larger than the end portion 1C is formed.
【００２９】前述した第１形態および第２形態では、ダ
イ加工を採用したが、例えば、他端部１Ｃの縮径率が高
いと、数種類のダイによって複数回の加工を必要とする
場合がある。これに対して、第２形態では、他端部加工
手段として成形ロール９によるロール加工を用いている
ので、高い縮径率でも一度の加工で行うことができる。In the first and second embodiments described above, die processing is employed. For example, if the diameter reduction ratio of the other end portion 1C is high, multiple types of processing may be required for several types of dies. . On the other hand, in the second embodiment, since the roll processing by the forming roll 9 is used as the other end processing means, it is possible to perform a single processing even at a high diameter reduction ratio.
【００３０】次に、本発明に係る焼結軸受の製造方法に
おける実施の第４形態について、図５を参照して説明す
る。この図にあって、符号１１は筒状焼結体、１２はダ
イを示している。Next, a fourth embodiment of the method for manufacturing a sintered bearing according to the present invention will be described with reference to FIG. In this figure, reference numeral 11 denotes a cylindrical sintered body, and 12 denotes a die.
【００３１】第４形態に用いる筒状焼結体１１と第１形
態および第２形態に用いた筒状焼結体１との相違点は、
図５の（ａ）に示すように、他端部１１Ｃの外径が一端
部１１Ａの外径より大きく設定され、他端部１１Ｃと一
端部１１Ａとの外径差は少なくとも一端部１１Ａと他端
部１１Ｃとの内径差より大きく設定されている点であ
る。The difference between the cylindrical sintered body 11 used in the fourth embodiment and the cylindrical sintered body 1 used in the first embodiment and the second embodiment is as follows.
As shown in FIG. 5A, the outer diameter of the other end 11C is set to be larger than the outer diameter of the one end 11A, and the outer diameter difference between the other end 11C and the one end 11A is at least one end 11A and the other. This is a point that is set to be larger than the inner diameter difference from the end 11C.
【００３２】前記筒状焼結体１１を、図５の（ｂ）に示
すように、他端部１Ｃを下方に向けて、他端部１Ｃの外
周面に軸線を同じくして配したダイ１２上に配置すると
ともに、筒状焼結体１１およびダイ１２に、一端部１１
Ａの内径と同じ外径に設定された円柱状のコアロッド３
を挿入する。前記ダイ１２は、他端部１Ｃの外径より小
さい内径の成形穴を有し、他端方向に漸次内径が狭めら
れた縮径部分１２ａを有する円環状の成形金型である。
ダイ１２における最小径部１２ｂとコアロッド３の外径
部との間隔は、他端部１１Ｃの厚さより狭く設定されて
いる。また、最小径部１２ｂは、その内径が一端部１１
Ａおよび中央部１１Ｂの外径と同じに設定されている。As shown in FIG. 5 (b), a die 12 in which the other end 1C is directed downward and the cylindrical sintered body 11 is arranged on the outer peripheral surface of the other end 1C with the same axis. And one end portion 11 on the cylindrical sintered body 11 and the die 12.
Columnar core rod 3 set to the same outer diameter as the inner diameter of A
Insert The die 12 is an annular molding die having a molding hole having an inner diameter smaller than the outer diameter of the other end 1C and having a reduced diameter portion 12a whose inner diameter is gradually narrowed in the other end direction.
The distance between the minimum diameter part 12b of the die 12 and the outer diameter part of the core rod 3 is set smaller than the thickness of the other end part 11C. The minimum diameter portion 12b has an inner diameter that is one end portion 11b.
A and the outer diameter of the central portion 11B are set to be the same.
【００３３】次に、上パンチ４によって筒状焼結体１１
の上端を軸方向に押圧するとともに、他端部１１Ｃをダ
イ１２に押し込んで、筒状焼結体１１の下端がダイ１２
の底部に達するまでダイ加工を施す。このとき、他端部
１１Ｃの外周面は、縮径部分１２ａで内方に向けて加圧
されて徐々に縮径される。そして、最小径部１２ｂで
は、他端部１１Ｃの内周面がコアロッド３に支持され
て、他端部１１Ｃが一端部１１Ａと同じ内径に縮径され
る。この他端部１１Ｃの内周面は、回転軸を摺動自在に
支持する第２摺動面１１ｃとされる。また、同時に、中
央部１１Ｂに一端部１１Ａおよび他端部１１Ｃより大き
な内径を有する逃げ部１１ｂが形成される。さらに、縮
径された他端部１１Ｃは、一端部１１Ａおよび中央部１
１Ｂと同じ外径となり、一端部１１Ａ、中央部１１Ｂお
よび他端部１１Ｃは、それぞれ面一状態となる。Next, the cylindrical sintered body 11 is
Is pressed in the axial direction, and the other end 11C is pushed into the die 12 so that the lower end of the cylindrical sintered body 11 is
Die processing until it reaches the bottom of. At this time, the outer peripheral surface of the other end portion 11C is pressurized inward at the reduced diameter portion 12a and gradually reduced in diameter. In the minimum diameter portion 12b, the inner peripheral surface of the other end 11C is supported by the core rod 3, and the other end 11C is reduced in diameter to the same inner diameter as the one end 11A. The inner peripheral surface of the other end 11C is a second sliding surface 11c that slidably supports the rotating shaft. At the same time, a relief portion 11b having a larger inner diameter than the one end portion 11A and the other end portion 11C is formed in the central portion 11B. Further, the reduced-diameter other end portion 11C is connected to the one end portion 11A and the central portion 1C.
The outer diameter is the same as 1B, and the one end 11A, the center 11B, and the other end 11C are flush with each other.
【００３４】このように筒状焼結体１１を上記方法で加
工した焼結軸受は、潤滑油を含浸させて焼結含油軸受と
した後、ハウジング内に圧入によって取り付けた際に、
外周面に凹凸がなく外周面全面でハウジングに当接する
ことから、ハウジングとの接触面積が広がり、摩擦抵抗
の増大によって軸方向への軸ズレが生じ難い。The sintered bearing obtained by working the cylindrical sintered body 11 in the above-described manner is impregnated with a lubricating oil to form a sintered oil-impregnated bearing.
Since the outer peripheral surface has no irregularities and is in contact with the housing over the entire outer peripheral surface, the contact area with the housing is increased, and axial displacement is less likely to occur in the axial direction due to an increase in frictional resistance.
【００３５】なお、第１形態、第２形態および第３形態
によって製造された焼結含油軸受を、ハウジングに組み
込む場合には、縮径によって凹んだ他端部の形状に対応
させた凸部をハウジングの軸受挿入孔に形成して嵌め込
むことにより、他端部の外周面と前記軸受挿入孔とが接
触状態となり、他端部をより強く支持することができる
とともに、軸方向の軸ズレを抑制することができる。When the sintered oil-impregnated bearings manufactured according to the first, second, and third embodiments are incorporated in a housing, a convex portion corresponding to the shape of the other end recessed by reducing the diameter is used. By forming and fitting in the bearing insertion hole of the housing, the outer peripheral surface of the other end and the bearing insertion hole come into contact with each other, and the other end can be supported more strongly and the axial misalignment can be reduced. Can be suppressed.
【００３６】上記の各形態で参照した各図面における筒
状焼結体および焼結軸受は、その形状を理解しやすくす
るため、逃げ部等の厚さ方向の寸法を誇張して図示して
いる。The cylindrical sintered body and the sintered bearing in each of the drawings referred to in the above embodiments are exaggerated in the thickness direction of the relief portion and the like for easy understanding of the shapes. .
【００３７】[0037]
【発明の効果】本発明によれば、以下の効果を奏する。 （１）請求項１記載の焼結軸受によれば、他端部が一端
部より高密度に形成されているので、他端部に強い力が
加わっても高い支持力が得られ、潤滑油に含浸させる
と、高い含油率を有する一端部から他端部に潤滑油が供
給されることにより、高い支持力と潤滑油による低摩擦
性を長期間にわたって維持することができる。また、他
端部の外周面に突条部が形成されているので、突条部の
上面がハウジングに圧入する際のガイド面となり、容易
にハウジング内に組み込むことができ、組立工程の効率
化を図ることができる。According to the present invention, the following effects can be obtained. (1) According to the sintered bearing of the first aspect, since the other end is formed at a higher density than the one end, a high supporting force can be obtained even if a strong force is applied to the other end, and the lubricating oil can be obtained. When the lubricating oil is impregnated with the lubricating oil, the lubricating oil is supplied from one end having a high oil content to the other end, so that a high supporting force and a low friction property due to the lubricating oil can be maintained for a long period of time. In addition, since the ridge is formed on the outer peripheral surface of the other end, the upper surface of the ridge serves as a guide surface for press-fitting into the housing, and can be easily incorporated into the housing, thereby increasing the efficiency of the assembly process. Can be achieved.
【００３８】（２）請求項２記載の焼結軸受の製造方法
によれば、他端部加圧手段で、他端部に縮径を施して第
２摺動面と逃げ部を形成することができ、また、他端部
のみを圧縮加工することにより、他端部を一端部より高
密度化して高い強度を有する他端部と、潤滑油に含浸さ
せると高い含油率を有する一端部とを有することができ
る。さらに、外周面に突部等が形成されないので、外周
面の加工処理等を行わずに一体構造のハウジングに組み
込むことができ、製造コストの削減を図ることができ
る。 （３）請求項３記載の焼結軸受の製造方法によれば、他
端部加圧手段を、ダイ加工とすることにより、他端部の
縮径工程にかかる時間が短く、量産性を向上させること
ができる。[0038] (2) According to the production method of the sintered bearing according to claim 2, wherein in the other end portion pressing means, to form a second sliding surface and a flank portion is subjected to diameter reduction to the other end Also, by compressing only the other end, the other end has a higher strength than the one end and has a higher strength, and one end having a high oil content when impregnated with lubricating oil. Can be provided. Furthermore, since no projections or the like are formed on the outer peripheral surface, the outer peripheral surface can be incorporated into a housing having an integral structure without performing processing or the like on the outer peripheral surface, thereby reducing manufacturing costs. ( 3 ) According to the method for manufacturing a sintered bearing according to the third aspect , the time required for the step of reducing the diameter of the other end is shortened by improving the other end pressing means by die processing, thereby improving mass productivity. Can be done.
【００３９】（４）請求項４記載の焼結軸受の製造方法
によれば、他端部の外径を前記の設定としているので、
他端部の外周面を一端部の外周面と面一に圧縮加工して
表面を平坦化することにより、ハウジングとの接触面積
が広がり、軸方向への軸ズレが生じ難い焼結軸受を容易
に製造することができる。[0039] (4) According to the production method of the sintered bearing according to claim 4, since the outer diameter of the other end portion is set to the setting,
By flattening the surface by compressing the outer peripheral surface of the other end to be flush with the outer peripheral surface of the one end, the contact area with the housing is widened, making it easy to produce a sintered bearing that is less likely to axially shift. Can be manufactured.
【図１】本発明に係る焼結軸受およびその製造方法の第
１形態におけるダイ加工前の筒状焼結体とダイ加工時の
ダイおよび筒状焼結体とを示す断面図である。FIG. 1 is a cross-sectional view showing a cylindrical sintered body before die processing and a die and a cylindrical sintered body during die processing in a first embodiment of a sintered bearing and a method of manufacturing the same according to the present invention.
【図２】本発明に係る焼結軸受およびその製造方法の第
２形態におけるダイを示す平面図である。FIG. 2 is a plan view showing a die according to a second embodiment of the sintered bearing and the method of manufacturing the same according to the present invention.
【図３】本発明に係る焼結軸受およびその製造方法の第
２形態における焼結軸受を示す正面図である。FIG. 3 is a front view showing a sintered bearing according to a second embodiment of the present invention;
【図４】本発明に係る焼結軸受およびその製造方法の第
３形態におけるロール加工時の成形ロールおよび筒状焼
結体を示す断面図である。FIG. 4 is a cross-sectional view showing a forming roll and a cylindrical sintered body during roll processing in a third embodiment of a sintered bearing and a method of manufacturing the same according to the present invention.
【図５】本発明に係る焼結軸受およびその製造方法の第
４形態におけるダイ加工前の筒状焼結体とダイ加工時の
ダイおよび筒状焼結体とを示す断面図である。FIG. 5 is a cross-sectional view showing a cylindrical sintered body before die processing and a die and a cylindrical sintered body during die processing in a fourth embodiment of the sintered bearing and the method for manufacturing the same according to the present invention.
１，１１ 筒状焼結体 １Ａ，１１Ａ 一端部 １Ｂ，１１Ｂ 中央部 １Ｃ，１１Ｃ 他端部 １ａ，１１ａ 第１摺動面 １ｂ，１１ｂ 逃げ部 １ｃ，１１ｃ 第２摺動面 ２，５，１２ ダイ ５ａ 突部形成用溝 ３，７ コアロッド ４ 上パンチ ６ 焼結軸受 ６ａ 突条部 ８ 上部支持部材 ９ 成形ロール Ｇ ガイド面 1,11 Cylindrical sintered body 1A, 11A One end 1B, 11B Central part 1C, 11C Other end 1a, 11a First sliding surface 1b, 11b Escape portion 1c, 11c Second sliding surface 2, 5, 12 Die 5a Groove for forming protrusions 3,7 Core rod 4 Upper punch 6 Sintered bearing 6a Ridge 8 Upper support member 9 Forming roll G Guide surface
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−240901（ＪＰ，Ａ) 特開 平５−65505（ＪＰ，Ａ) 特開 平２−8302（ＪＰ，Ａ) 特開 平７−332363（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F16C 17/00 - 17/26 F16C 33/00 - 33/28 F16C 35/02 F16B 4/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-240901 (JP, A) JP-A-5-65505 (JP, A) JP-A-2-8302 (JP, A) JP-A-7- 332363 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) F16C 17/00-17/26 F16C 33/00-33/28 F16C 35/02 F16B 4/00
Claims (4)
受であって、 その一端部および他端部は、その内周面がそれぞれ回転
軸を摺動自在に支持する第１摺動面および第２摺動面と
されるとともに、一端部と他端部との間の中央部の内周
面に、周方向に沿って円環状に凹んだ逃げ部が形成され
てなり、 前記他端部は、一端部より高密度であると共に、その外
周面に軸方向に沿って複数の突条部が形成され、 これら突条部の上面には、前記一端部の外周面と面一な
ガイド面が形成されている ことを特徴とする焼結軸受。1. A sintered bearing formed of a sintered alloy in a cylindrical shape, wherein one end and the other end of the first bearing have inner circumferential surfaces slidably supporting a rotating shaft, respectively. Surface and a second sliding surface, and a relief portion which is annularly concave along the circumferential direction is formed on an inner peripheral surface at a central portion between the one end and the other end. end, together with a high density from one end, the outer
A plurality of ridges are formed on the peripheral surface along the axial direction, and the upper surfaces of these ridges are flush with the outer peripheral surface of the one end.
A sintered bearing having a guide surface .
持する第１摺動面とされかつ中央部および他端部の内径
が一端部より大きく設定された筒状焼結体を形成してお
き、該筒状焼結体に円柱状のコアロッドを挿入し、この
挿入状態で他端部の外周面を他端部加圧手段によって内
方に向けて加圧することにより、該他端部を縮径させて
その内周面を回転軸を摺動自在に支持する第２摺動面と
するとともに、中央部の内周面に周方向に沿って円環状
に凹んだ逃げ部を形成し、 このとき他端部を、一端部より高密度とすると共に、そ
の外周面に軸方向に沿って複数の突条部を形成し、これ
ら突条部の上面に、前記一端部の外周面と面一なガイド
面を形成する ことを特徴とする焼結軸受の製造方法。2. A cylindrical sintered body having an inner peripheral surface at one end serving as a first sliding surface slidably supporting a rotating shaft, and inner diameters of a central portion and the other end set to be larger than those of the one end. Is formed, a cylindrical core rod is inserted into the cylindrical sintered body, and in this inserted state, the outer peripheral surface of the other end is pressed inward by the other end pressing means, whereby the cylindrical core rod is pressed. The other end portion is reduced in diameter and its inner peripheral surface is used as a second sliding surface for slidably supporting the rotating shaft, and a relief portion is formed in the inner peripheral surface of the central portion in an annular shape along the circumferential direction. is formed and the other end this time, as well as a high-density from one end, its
A plurality of ridges are formed on the outer peripheral surface of the
A guide that is flush with the outer peripheral surface of the one end
A method for producing a sintered bearing, comprising forming a surface .
いて、 前記他端部加圧手段は、前記筒状焼結体の他端部の外径
より小さい内径の成形穴を有するダイに筒状焼結体の他
端部を押し込んで縮径させるダイ加工であることを特徴
とする焼結軸受の製造方法。3. The method for manufacturing a sintered bearing according to claim 2 , wherein the other end pressing means is provided on a die having a forming hole having an inner diameter smaller than an outer diameter of the other end of the cylindrical sintered body. A method for producing a sintered bearing, which is a die working in which the other end of the cylindrical sintered body is pushed in to reduce the diameter.
方法において、 縮径される前の前記他端部の外径は一端部の外径より大
きく設定され、 前記加圧時に他端部を一端部と同じ外径に縮径すること
を特徴とする焼結軸受の製造方法。4. The method for manufacturing a sintered bearing according to claim 2 , wherein an outer diameter of the other end before being reduced is set to be larger than an outer diameter of one end, and A method for manufacturing a sintered bearing, wherein an end portion is reduced in diameter to the same outer diameter as one end portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22237395A JP3307182B2 (en) | 1995-08-30 | 1995-08-30 | Sintered bearing and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22237395A JP3307182B2 (en) | 1995-08-30 | 1995-08-30 | Sintered bearing and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0968225A JPH0968225A (en) | 1997-03-11 |
| JP3307182B2 true JP3307182B2 (en) | 2002-07-24 |
Family
ID=16781343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22237395A Expired - Fee Related JP3307182B2 (en) | 1995-08-30 | 1995-08-30 | Sintered bearing and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3307182B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002227841A (en) * | 2001-01-30 | 2002-08-14 | Namiki Precision Jewel Co Ltd | Fluid dynamic bearing for small sized flat motor, small sized flat motor, fan motor and air forcedly feeding type air battery |
| KR20080099763A (en) * | 2007-05-09 | 2008-11-13 | 엘지이노텍 주식회사 | Bearing of spindle motor and spindle motor using the same |
-
1995
- 1995-08-30 JP JP22237395A patent/JP3307182B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0968225A (en) | 1997-03-11 |
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