JP4029176B2 - Sintered oil-impregnated bearing - Google Patents
Sintered oil-impregnated bearing Download PDFInfo
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- JP4029176B2 JP4029176B2 JP33840498A JP33840498A JP4029176B2 JP 4029176 B2 JP4029176 B2 JP 4029176B2 JP 33840498 A JP33840498 A JP 33840498A JP 33840498 A JP33840498 A JP 33840498A JP 4029176 B2 JP4029176 B2 JP 4029176B2
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- 239000000843 powder Substances 0.000 claims description 47
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 25
- 239000002994 raw material Substances 0.000 claims description 25
- 239000010949 copper Substances 0.000 claims description 23
- 229910052802 copper Inorganic materials 0.000 claims description 22
- 230000035699 permeability Effects 0.000 claims description 19
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 16
- 239000000314 lubricant Substances 0.000 claims description 14
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 13
- 229910001369 Brass Inorganic materials 0.000 claims description 12
- 239000010951 brass Substances 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 11
- 239000011701 zinc Substances 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims 2
- 239000003921 oil Substances 0.000 description 22
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 239000000344 soap Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004898 kneading Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- -1 30-60% Chemical compound 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Powder Metallurgy (AREA)
- Sliding-Contact Bearings (AREA)
Description
【0001】
【発明の属する技術分野】
本発明は焼結含油軸受およびその製造方法に係り、含油率が高いと共に給油が適切に制御されて耐用性に優れた含油軸受およびその製造方法を提供し、また強度的に優れると共に軸材に対するなじみ性の如きにおいても安定した新規な焼結含油軸受を提供しようとするものである。
【0002】
【従来の技術】
焼結含油軸受は従来から種々に採用されて来たところであるが斯様な焼結含油軸受においては適当な含油率を得しめることが必要であって含油率の低いものにおいては適切な潤滑性、耐用性を得ることができない。ところがこの含油率を高めるには焼結体における孔隙率を高めることが必要で、斯様な要請から孔隙率の高められたものは機械的強度において劣ったものとならざるを得ず、このように基本的に相反するような特性を適切な水準まで高めるための手法の1つとしては特公昭57−45801号公報(特開昭54−103935号)が発表されている。
【0003】
即ち、銅粉に錫粉および潤滑剤として金属石けんを添加混合し、しかも該混合粉を圧粉成形、焼結するに当って原料銅粉としての粒度325メッシュ以下の微粉を30〜60%含有したものを採用し、しかも金属石けんの添加量を3%を超え7%のような範囲とするものである。
【0004】
【発明が解決しようとする課題】
前記したような従来一般のものにおいては孔隙率を高めて含油率を高くすることとならざるを得ず、強度的に劣ったものとならざるを得ないが、これを解消する前記特公昭57−45801号公報のものは原料銅粉として325メッシュ以下の微粉を30〜60%のように大量に必要とし、しかも金属石けんを3%以上のように大量に使用して圧粉成形するものであるからラトラ値で代表される圧粉体強度等の低下により生産性の低下を避け得ない。
【0005】
また銅粉と錫粉を主材とし、しかも上記のようにそれらの微粉が相当量必要であると共に金属石けんなどを通常よりも多量に用いることが必要であるから原材料的にも相当のコストアップとならざるを得ないし、製造操作上においても金型への充填性や熱間混練の必要性増大、混練後冷却してから特別な解きほぐしを必要とするなどの製造操作上における困難性増加その他の不利を伴うこととならざるを得ない。
【0006】
更に前記したような従来のものは潤滑特性との関係において圧粉体の強度を高めるために固形潤滑材を3〜7%添加すると共に微粉を多量配合するものであるから含油率に制約があり、また固形潤滑材は焼結金属中に異質材が介入分布することからその多量配合は焼結体の組織や強度その他に悪影響を与えることとならざるを得ない。
【0007】
【課題を解決するための手段】
本発明は上記したような従来のものにおける技術的課題を解消することについて検討を重ね、特定の含油率と通気度を具備した焼結含油軸受を特定の金属粉末を採用することによって的確に得しめ、また強度その他の特性を適切に具備させることに成功したものであって、以下の如くである。
【0011】
(1)含油率が31〜40容量%、通気度が68×10−3darcy以下、圧環強度が15kgf/mm2以上であって、鉄粉に対して10〜30wt%の銅が被覆された銅被覆鉄粉100重量部に対し錫粉1〜3重量部と亜鉛粉単体もしくは黄銅粉として亜鉛成分が0.1〜12重量部になるように添加した原料粉による圧粉成形焼結体であることを特徴とした焼結含油軸受。
【0012】
(2)含油率が31〜40容量%、通気度が68×10−3darcy以下、圧環強度が15kgf/mm2以上であって、鉄粉に対して10〜30wt%の銅が被覆された銅被覆鉄粉または該銅被覆鉄粉100重量部に対し錫粉1〜3重量部と亜鉛粉単体もしくは黄銅粉として亜鉛成分が0.1〜12重量部になるように添加した原料粉に対し固形潤滑材を2wt%以上含有させた原料紛よる圧粉成形焼結体であることを特徴とした焼結含油軸受。
【0013】
【発明の実施の形態】
上記したような本発明によるのの具体的な実施態様について説明すると、本発明においては含油率が31%以上のように高く、しかも通気度が68×10-3darcy 以下のように低くされた焼結含油軸受を提供するものであって、用いる原料粉としては鉄粉に対し少くとも10wt%以上30wt%程度の銅が無電解メッキ法によって被覆された銅被覆鉄粉が採用される。即ち強度的主体は鉄粉であるがメッキその他によって銅被覆が完全状態に施されたものが用いられることによりなじみ性や耐食性などにおいて鉄粉とは本質的に異なったものである。
【0014】
また本発明においては上記のような銅被覆鉄粉に錫粉および亜鉛粉単体もしくは黄銅粉を添加することを提案するものであって、上記のような銅被覆鉄粉に対し錫粉と共に亜鉛粉単体もしくは黄銅粉の適量が添加されることによって該原料粉による圧粉成形焼結体の強度を更に高めた製品を得しめたもので、耐用性その他においてより好ましい焼結含油軸受を提供せしめる。
【0015】
更に本発明では上記のような原料粉に対し固形潤滑材を3wt%の範囲で添加することにより上述したような焼結含油軸受における強度性を確保しながら固形潤滑材による軸受性能の向上を適切に図らしめる。前記のような固形潤滑材の添加は圧粉成形時に行われ、即ち均等状に添加混合されたものとして圧粉成形される。
【0016】
上記したような銅被覆鉄粉または銅被覆鉄粉に錫粉と亜鉛粉単体もしくは黄銅粉を添加混合した原料を用いて圧粉成形、焼結された本発明の含油軸受は圧粉体強度の指標であるラトラ値が一般的に0.06〜0.08g程度として強度が得られ、焼結体における圧環強度としては15〜26 kgf/mm2 程度となる。また前記のようなメッキ法によるものの通気度は一般的に45〜70×10-3darcy のものとして得られる。なおこのものに潤滑油を含浸せしめたときの含油率としては25〜43 vol%となり、圧環強度は17〜28 kgf/mm2 であるが、必要に応じて固体潤滑剤を1〜3重量%の範囲で含有せしめ得る。
【0017】
【実施例】
本発明によるものの具体的な実施例について説明すると、本発明者等は0.04〜0.15mmの鉄粉に対し20重量%程度のCuを前述したメッキ法によって被覆せしめた圧粉成形焼結用粉体を準備し、この銅被覆鉄粉を用いて後述する参考例1〜4のように各軸受体を製造した。なお前記したメッキ法による原料粉は銅被覆層がポーラス状になっていて比表面積が大であり、粉末状態で通気度を低くする特質を有しているものであった。
【0018】
また、本発明者等は上記したような銅被覆鉄粉に対して錫粉および亜鉛粉単体もしくは黄銅粉を添加混合した圧粉成形焼結用粉体を準備し、このような錫粉と亜鉛粉単体もしくは黄銅粉配合原料粉末を用いて後述する実施例1以下のような各軸受体を製造した。
【0019】
〔参考例1〕上記の原料粉末を用いて、軸受体の含油率を31容量%とし内径2mm、外径5mmで高さが3mmの軸受体を作製した。なお、得られた軸受体は、圧粉体のラトラ値(圧粉体の強度)が0.06g、焼結体の圧環強度が22kgf/mm2であり、通気度が48×10−3darcyであった。
【0020】
〔参考例2〕前記した参考例1と同様の原料粉末を用いて、軸受体の含油率を40容量%とした実施例1と同様な軸受材を作製した。なお、このようにして得られた軸受体は、該圧粉体のラトラ値が0.07gで、焼結体の圧環強度が18kgf/mm2であり、通気度が57×10−3darcyであった。
【0021】
〔参考例3〕上記参考例1の原料粉末に潤滑材を3重量%以下添加すると共に、実施例1と同形状の焼結体とし、該軸受体の含油率を32容量%とした軸受試料を作製した。なお、得られた軸受体は、圧粉体のラトラ値が0.065g、焼結体の圧環強度が21kgf/mm2であり、通気度が55×10−3darcyであった。
【0022】
〔参考例4〕参考例1の原料粉末に圧粉成形時に固形潤滑材を2重量%添加し、実施例1と同じ形状、寸法の焼結体とし、軸受体の含油率を39容量%とした軸受試料を作製した。またこのようにして得られた軸受体は、圧粉体のラトラ値が0.075g、焼結体の圧環強度が15kgf/mm2であり、通気度が62×10−3darcyであった。
【0023】
〔実施例1〕上記した銅被覆鉄粉による原料粉末100重量部に対して錫粉1.5重量部と亜鉛粉単体もしくは黄銅粉として亜鉛成分が5重量部になるように添加混合した圧粉成形用原料粉を用いて、軸受体の含油率を30容量%とし内径2mm、外径5mmで高さが3mmの軸受体を作製した。なお得られた軸受体は、圧粉体のラトラ値(圧粉体の強度)が0.06g、焼結体の圧環強度が24kgf/mm2であり、通気度が47×10−3darcyであった。
【0024】
〔実施例2〕前記した実施例1と同様の銅被覆鉄粉100重量部に対して錫粉2.5重量部と亜鉛粉単体もしくは黄銅粉として亜鉛成分が10.5重量部になるように添加混合した原料粉末を用いて、軸受体の含油率を38容量%とした実施例5と同様な軸受材を作製した。なお、このようにして得られた軸受体は、該圧粉体のラトラ値が0.07gで、焼結体の圧環強度が20.5kgf/mm2であり、通気度が58×10−3darcyであった。
【0025】
〔実施例3〕上記した銅被覆鉄粉による原料粉末100重量部に対して錫粉1.2重量部と亜鉛粉単体もしくは黄銅粉として亜鉛成分が0.5重量部になるように添加混合した金属粉末に固形潤滑材を1.5重量%以下添加すると共に、実施例5と同形状の焼結体とし、該軸受体の含油率を30容量%とした軸受試料を作製した。なお、得られた軸受体は、圧粉体のラトラ値が0.065g、焼結体の圧環強度が21kgf/mm2であり、通気度が55×10−3darcyであった。
【0026】
〔実施例4〕実施例1の原料粉末に圧粉成形時に固形潤滑材を2重量%添加し、実施例5と同じ形状、寸法の焼結体とし、軸受体の含油率を39容量%とした軸受試料を作製した。またこのようにして得られた軸受体は、圧粉体のラトラ値が0.075g、焼結体の圧環強度が15kgf/mm2であり、通気度が62×10−3darcyであった。
【0027】
上記のような本発明の各実施例に対する比較例として本発明者等が準備したものは、以下の通りである。
比較例1−電解銅粉に対し、8〜11重量%の錫粉を添加した原料粉を用いて上記実施例と同様の条件で軸受試料を作製した。即ちこのようにして得られた軸受体は、含油率が約20容量%であり、圧粉体のラトラ値が0.065g、焼結体の通気度が70×10-3darcy であった。
比較例2−比較例1の粉末に潤滑材を3重量%以下添加した原料粉を用いて、上記実施例と同様の条件で軸受試料を作製したが、このようにして得られた軸受体は、含油率が約20容量%であり、焼結体の圧環強度が18 kgf/mm2 であった。
【0028】
上記したような本発明の実施例1〜8による製品と比較例1、2による製品について検討した結果によると、本発明の実施例によるものは含油量において比較例のものの1.5〜2.0倍であり、また通気度は比較例より10〜30%程度低いものであるから耐用性において少なくとも50%以上で場合によっては150%超に達するものであることが確認された。
【0029】
【発明の効果】
上記したような本発明によるときは圧環強度が高くて機械的強度に優れ、また含油率が一般的な20容量%前後に対し2倍前後と比較的高いにも拘わらず通気度が低目であって長期に亘って好ましい潤滑作用を実現し、耐用性に優れた焼結含油軸受を提供し得るものであるから工業的にその効果の大きい発明である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sintered oil-impregnated bearing and a method for producing the same, and provides an oil-impregnated bearing and a method for producing the oil-impregnated bearing having a high oil content and appropriately controlled lubrication and excellent durability. It is an object of the present invention to provide a novel sintered oil-impregnated bearing that is stable even in terms of compatibility.
[0002]
[Prior art]
Sintered oil-impregnated bearings have been used in various ways. However, it is necessary to obtain an appropriate oil content in such sintered oil-impregnated bearings. Can not get the durability. However, in order to increase the oil content, it is necessary to increase the porosity of the sintered body. From such a requirement, the increased porosity must be inferior in mechanical strength. Japanese Patent Publication No. 57-45801 (Japanese Patent Laid-Open No. 54-103935) has been published as one of the techniques for raising the characteristics which are basically contradictory to each other to an appropriate level.
[0003]
In other words, tin powder and metal soap as a lubricant are added to and mixed with copper powder, and the mixed powder is compacted and sintered, and contains 30 to 60% fine powder having a particle size of 325 mesh or less as raw material copper powder. In addition, the amount of metal soap added is in the range of more than 3% to 7%.
[0004]
[Problems to be solved by the invention]
In the conventional ones as described above, the porosity must be increased to increase the oil content, and the strength must be inferior. No. -45801 requires a large amount of fine powder of 325 mesh or less as a raw material copper powder, such as 30-60%, and is compacted by using a large amount of metal soap, such as 3% or more. Therefore, a reduction in productivity is unavoidable due to a reduction in the green compact strength represented by the Latra value.
[0005]
In addition, copper powder and tin powder are the main materials, and as mentioned above, a considerable amount of these fine powders are required, and metal soap and the like need to be used in a larger amount than usual. In addition, there is an increase in the difficulty in manufacturing operations such as filling into the mold and the need for hot kneading, and special unraveling after cooling after kneading. It must be accompanied by a disadvantage.
[0006]
Furthermore, in the conventional type as described above, the oil content is limited because 3-7% of a solid lubricant is added and a large amount of fine powder is blended in order to increase the strength of the green compact in relation to the lubrication characteristics. In addition, since a foreign material intervenes and distributes in a sintered metal in a solid lubricant, a large amount of mixture has to adversely affect the structure, strength, etc. of the sintered body.
[0007]
[Means for Solving the Problems]
The present invention has repeatedly studied on solving the technical problems in the conventional ones as described above, and obtained a sintered oil-impregnated bearing having a specific oil content and air permeability by using a specific metal powder. In addition, it has succeeded in appropriately providing strength and other characteristics as follows.
[0011]
(1) Oil content is 31 to 40% by volume, air permeability is 68 × 10 −3 darcy or less, crushing strength is 15 kgf / mm 2 or more, and 10 to 30 wt% of copper is coated on iron powder. It is a compacted sintered body made of raw material powder added so that the zinc component becomes 0.1 to 12 parts by weight as a zinc powder alone or brass powder with respect to 100 parts by weight of copper-coated iron powder. A sintered oil-impregnated bearing characterized by being.
[0012]
(2) The oil content is 31 to 40% by volume, the air permeability is 68 × 10 −3 darcy or less, the crushing strength is 15 kgf / mm 2 or more, and 10 to 30 wt% copper is coated on the iron powder. 1 to 3 parts by weight of tin powder and 100 parts by weight of the copper-coated iron powder and raw material powder added so that the zinc component is 0.1 to 12 parts by weight as zinc powder alone or brass powder A sintered oil-impregnated bearing characterized in that it is a compacted sintered body made of a raw material powder containing 2 wt% or more of a solid lubricant.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A specific embodiment of the present invention as described above will be described. In the present invention, the oil content is as high as 31% or more and the air permeability is as low as 68 × 10 −3 darcy or less. A sintered oil-impregnated bearing is provided, and as a raw material powder to be used, copper-coated iron powder is used in which at least 10 wt% or more and 30 wt% of copper is coated by an electroless plating method with respect to iron powder. In other words, the strength main component is iron powder, but it is essentially different from iron powder in conformability and corrosion resistance by using a copper coating completely applied by plating or the like.
[0014]
Further, in the present invention, it is proposed to add tin powder and zinc powder alone or brass powder to the copper-coated iron powder as described above, and zinc powder together with tin powder to the copper-coated iron powder as described above. A product in which the strength of the green compact sintered body made of the raw material powder is further increased by adding an appropriate amount of a simple substance or brass powder is obtained, and a more preferable sintered oil-impregnated bearing is provided in terms of durability and the like.
[0015]
Furthermore, in the present invention, by adding a solid lubricant in the range of 3 wt% to the raw material powder as described above, it is possible to appropriately improve the bearing performance with the solid lubricant while ensuring the strength in the sintered oil-impregnated bearing as described above. Let's plan on. The addition of the solid lubricant as described above is performed at the time of compacting, that is, compacted as if it were added and mixed uniformly.
[0016]
The oil-impregnated bearing of the present invention, which is compacted and sintered using the above-described copper-coated iron powder or a raw material obtained by adding and mixing tin powder and zinc powder alone or brass powder with copper-coated iron powder, has a green compact strength. The strength is obtained when the ratra value as an index is generally about 0.06 to 0.08 g, and the crushing strength in the sintered body is about 15 to 26 kgf / mm 2 . Further, the air permeability of the plating method as described above is generally obtained as 45 to 70 × 10 −3 darcy. The oil content when impregnated with lubricating oil is 25 to 43 vol%, and the crushing strength is 17 to 28 kgf / mm 2. If necessary, the solid lubricant is added to 1 to 3 wt%. It can be contained in the range of.
[0017]
【Example】
The specific examples of the present invention will be described. The inventors of the present invention are compacted and sintered in which about 20% by weight of Cu is coated on the iron powder of 0.04 to 0.15 mm by the plating method described above. The powder was prepared, and each bearing body was manufactured as in Reference Examples 1 to 4 described later using this copper-coated iron powder. In addition, the raw material powder by the above-described plating method has a characteristic that the copper coating layer is porous, the specific surface area is large, and the air permeability is lowered in the powder state.
[0018]
The present inventors also prepared a powder for powder compaction sintering in which tin powder and zinc powder alone or brass powder was added to and mixed with the copper-coated iron powder as described above. Each bearing body as described in Example 1 and below, which will be described later, was manufactured using powder alone or brass powder blended raw material powder.
[0019]
Reference Example 1 Using the above raw material powder, a bearing body having an oil content of 31% by volume and an inner diameter of 2 mm, an outer diameter of 5 mm and a height of 3 mm was produced. In addition, the obtained bearing body has a rattling value of the green compact (strength of the green compact) of 0.06 g, a pressure ring strength of the sintered body of 22 kgf / mm 2 , and an air permeability of 48 × 10 −3 darcy. Met.
[0020]
[ Reference Example 2 ] Using the same raw material powder as in Reference Example 1 described above, a bearing material similar to that in Example 1 was prepared in which the oil content of the bearing body was 40% by volume. The bearing body thus obtained had a green compact Latra value of 0.07 g, a sintered body having a crushing strength of 18 kgf / mm 2 , and an air permeability of 57 × 10 −3 darcy. there were.
[0021]
[ Reference Example 3 ] A bearing sample in which 3% by weight or less of a lubricant was added to the raw material powder of Reference Example 1 , and a sintered body having the same shape as in Example 1 was formed, and the oil content of the bearing body was 32% by volume. Was made. The obtained bearing body had a green compact Latra value of 0.065 g, a sintered body with a crushing strength of 21 kgf / mm 2 and an air permeability of 55 × 10 −3 darcy.
[0022]
[ Reference Example 4 ] 2% by weight of a solid lubricant was added to the raw material powder of Reference Example 1 at the time of compacting to form a sintered body having the same shape and size as in Example 1, and the oil content of the bearing body was 39% by volume. A bearing sample was prepared. The bearing body thus obtained had a green compact Latra value of 0.075 g, a sintered compact had a crushing strength of 15 kgf / mm 2 and an air permeability of 62 × 10 −3 darcy.
[0023]
[ Example 1 ] A green compact in which 1.5 parts by weight of tin powder and zinc powder alone or 5 parts by weight as a brass powder are added and mixed with 100 parts by weight of the raw material powder made of copper-coated iron powder. A bearing body having an oil content of 30% by volume and an inner diameter of 2 mm, an outer diameter of 5 mm, and a height of 3 mm was prepared using the molding raw material powder. The obtained bearing body had a green compact Latra value (green compact strength) of 0.06 g, a green compact strength of 24 kgf / mm 2 , and an air permeability of 47 × 10 −3 darcy. there were.
[0024]
[ Example 2 ] To 100 parts by weight of copper-coated iron powder as in Example 1 described above, 2.5 parts by weight of tin powder and zinc powder alone or 10.5 parts by weight as brass powder Using the added raw material powder, a bearing material similar to that of Example 5 in which the oil content of the bearing body was 38% by volume was produced. In the bearing body thus obtained, the green compact has a Latra value of 0.07 g, the sintered body has a crushing strength of 20.5 kgf / mm 2 , and an air permeability of 58 × 10 −3. It was darcy.
[0025]
[ Example 3 ] To 100 parts by weight of the raw material powder made of copper-coated iron powder, 1.2 parts by weight of tin powder and zinc powder alone or brass powder were added and mixed so that the zinc component would be 0.5 parts by weight. A solid lubricant was added to the metal powder in an amount of 1.5% by weight or less, a sintered body having the same shape as in Example 5 was prepared, and a bearing sample in which the oil content of the bearing body was 30% by volume was produced. The obtained bearing body had a green compact Latra value of 0.065 g, a sintered body with a crushing strength of 21 kgf / mm 2 and an air permeability of 55 × 10 −3 darcy.
[0026]
[ Example 4 ] 2% by weight of a solid lubricant was added to the raw material powder of Example 1 at the time of compacting to form a sintered body having the same shape and size as Example 5, and the oil content of the bearing body was 39% by volume. A bearing sample was prepared. The bearing body thus obtained had a green compact Latra value of 0.075 g, a sintered compact had a crushing strength of 15 kgf / mm 2 and an air permeability of 62 × 10 −3 darcy.
[0027]
What the present inventors have prepared as comparative examples for the above-described embodiments of the present invention are as follows.
Comparative Example 1 A bearing sample was produced under the same conditions as in the above example using raw material powder to which 8 to 11% by weight of tin powder was added with respect to the electrolytic copper powder. That is, the bearing body thus obtained had an oil content of about 20% by volume, a green compact Latra value of 0.065 g, and a sintered body air permeability of 70 × 10 −3 darcy.
Comparative Example 2 A bearing sample was produced under the same conditions as in the above example using the raw material powder obtained by adding 3% by weight or less of the lubricant to the powder of Comparative Example 1, but the bearing body thus obtained was The oil content was about 20% by volume, and the crushing strength of the sintered body was 18 kgf / mm 2 .
[0028]
According to the result of examining the products according to Examples 1 to 8 of the present invention and the products according to Comparative Examples 1 and 2, the oil content according to the example of the present invention is 1.5 to 2. It was 0 times, and the air permeability was about 10 to 30% lower than that of the comparative example, so that it was confirmed that the durability was at least 50% or more and sometimes exceeded 150%.
[0029]
【The invention's effect】
According to the present invention as described above, the crushing strength is high and the mechanical strength is excellent, and the air permeability is low although the oil content is relatively high, which is about twice as high as about 20% by volume. Therefore, since it is possible to provide a sintered oil-impregnated bearing that achieves a preferable lubricating action over a long period of time and is excellent in durability, it is an industrially significant invention.
Claims (2)
Priority Applications (1)
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JP33840498A JP4029176B2 (en) | 1998-11-13 | 1998-11-13 | Sintered oil-impregnated bearing |
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JP33840498A JP4029176B2 (en) | 1998-11-13 | 1998-11-13 | Sintered oil-impregnated bearing |
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JP4029176B2 true JP4029176B2 (en) | 2008-01-09 |
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CN102506072A (en) * | 2011-10-13 | 2012-06-20 | 枣庄市润源粉末冶金有限公司 | Powder metallurgy oil-impregnated bearing |
CN102672181A (en) * | 2012-06-07 | 2012-09-19 | 太仓市锦立得粉末冶金有限公司 | Production process of powder metallurgy products |
JP6927271B2 (en) * | 2015-12-04 | 2021-08-25 | 株式会社村田製作所 | Electronic components and manufacturing methods for electronic components |
CN108746612A (en) * | 2018-08-30 | 2018-11-06 | 江晓堂 | The bearing used in a kind of low lubricant environment invades the metallurgy sintered device of oil |
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