482825 Λ7 ________R*7 五、發明説明(1 ) 發明之目的 本發明係有關以簡易且低成本的,而且不使含油率降 低下,而得較低的通氣度,摩擦係數稍少且在固定狀態, 耐蝕性高,嚙合性優越,又耐用性之含油較高的燒結軸承 用複合金屬粉末作爲電動機用軸承等,及含油之燒結軸承 習知技術 關於被覆銅鐵粉之軸承用燒結體,有日本特公昭5 5 一 3 8 0 1 9號公報,採用對鐵粉被覆以3 0〜6 0%之 銅者被提出申請,又日本特開平3 - 1 6 6 3 0 3號者, 係由與被覆層相同或合金化之金屬而成的箔狀粉添加而成 者。 經濟部中央標準局員工消费合作社印製 (請先閲讀背面之注意事項再填寫本頁) 又於日本特公平7 - 5 4 1 2 6號,爲使含油之燒結 軸承的特性提高,有降低通氣度之必要,乃有添加銅-石 墨複合粉末被提出,再者於日本特開平8 — 2 0 8 3 6號 ,提出由被覆銅之鐵粉製成的軸承材料,邊確保含油量爲 1 8容量%以上邊作成通氣度3 0 Dercy( 3 0 X 1 0 _ 1 1 cm2)以下者,因此,採用已被覆3 0〜6 0重量%銅之 鐵粉,而且以鋅籠罩氣燒結,使吸附鋅。 〔習知技術之問題〕 依前述的日本特公昭5 5 — 3 8 0 1 9號製得者係以 使被覆3 0%以上之銅爲要件者,需大量之價昂的銅,不482825 Λ7 ________ R * 7 V. Description of the invention (1) Purpose of the invention The invention relates to a simple and low-cost, and without reducing the oil content, but a lower air permeability, a slightly lower coefficient of friction and a fixed state , High corrosion resistance, excellent meshing, and high durability. Oil-containing composite metal powder for sintered bearings as bearings for electric motors, and oil-containing sintered bearings. Known technology About sintered bodies for bearings coated with copper-iron powder. Japan Japanese Patent Publication No. 5 5-3 8 0 1 9 applies for those who use iron powder coated with 30 to 60% of copper, and Japanese Patent Application No. 3-1 6 6 3 0 3 Addition of foil powder made of the same or alloyed metal. Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling out this page). It is also No. 7-5 4 1 2 6 in Japan. In order to improve the characteristics of sintered bearings containing oil, The necessity of air quality is the addition of copper-graphite composite powder, and in Japanese Unexamined Patent Publication No. 8-2 0 8 3 6, a bearing material made of iron powder coated with copper is proposed, while ensuring the oil content is 1 8 Above the volume%, the air permeability is less than 30 Dercy (3 0 X 1 0 _ 1 1 cm2). Therefore, iron powder that has been coated with 30 to 60% by weight copper is used, and sintered with zinc envelope gas to make adsorption. Zinc. [Problems of Known Technology] According to the aforementioned Japanese Patent Publication No. 5 5-3 8 0 19, those who make the coating more than 30% of copper as a requirement need a large amount of expensive copper.
本紙張尺度適用中國國家標準(CNS ) A4規格(210X297公釐) ITI 482825 _______B*7 五、發明説明¢2 ) 得已之下成本會提高,同時形成表層之銅層過厚,鐵粒子 之基材效果未能足夠獲得,以致有用作軸承之摺動性能低 劣的缺點。又,日本特開平3 — 166303號者,因係 添加由與被覆層相同或合金化的金屬而成之箔狀粉者,故 步驟上較繁雜,而且有未能製得安定的特性之缺點存在❶ 尤其此等者’欠缺對高性能軸承材上被要求的通氣性之考 量’試運轉完畢後,亦較難獲得油壓由軸承摺動面之油孔 釋出,接合含油之燒結軸承的理想之流體潤滑的摺動狀態 之不方便。 於前述日本特公平7 - 5 4 1 2 6號公報雖提及前述 的通氣度之抑制,惟此物因係添加銅-石墨複合粉末,故 該粉末不得不成爲價昂的,而且有使燒結體之強度降低的 缺點存在。又如前述的日本特開平8 - 2 0 8 3 6號者, 係採用3 0〜6 0%被覆銅之鐵粉,而且以在鋅籠罩氣中 燒結使吸附鋅之步驟爲要件者,由而即使特性優越,銅之 需要量高,而且需要在鋅籠罩氣下的燒結,步驟增多,不 論如何,均不得不製成價昂者。 經濟部中央標準局員工消费合作社印製 (請先閱讀背面之注意事項再填寫本頁) 爲解決上述缺問題之手段 本發明係爲解決上述的習用技術之課題,經多次檢討 ,採用對鐵粉被覆以1 Owt%以上,且未滿3 〇wt% 之銅的複合金屬粉,以該複合金屬粉之比表面積設爲特定 範圍,同時由該複合金屬粉而得的壓粉成形燒結體之通定 度設爲特定範圍,藉由使含油率成爲特定狀態,以至成功 本紙張尺度適用中國國家標準(CNS ) A4規格(210X297公釐)-5 - 482825 ____ B, _ __ 五、發明説明(3 ) 的以較低成本製得合適的軸承性能。 作用 亦即,依本發明者,藉由對鐵粉被覆以1 0%以上的 銅,以完全狀態的方式被覆鐵粉之周面,提高耐蝕性,同 時對軸材等之試運轉性成爲良好。又由於使此銅量成爲未 滿3 0%,可確保低成本性,而且可適當的獲得經予被覆 的鐵粒子之基材效果,可安定的獲得用作軸承之摺動性能 。且於鐵粉宋上被覆銅之方法並無更特殊的特定方法,惟 以無電解電鍍法而得者,銅被覆層形成多孔質的,以表面 積大,具有以粉末之狀態可降低通氣度等特質。 前述的被覆銅之鐵粉的粒度爲8 0篩目(mesh )以下 ,由於3 5 0篩目以下者爲3 0%以下,無需特別的原料 粉,採用一般的粉末冶金用鐵粉,可容易製得上述被覆銅 之鐵粉,對模具之塡充等方面並無困難性,可予容易的成 形操作,可低成本的製得製品。 經濟部中央標隼局員工消費合作社印製 (請先閱讀背面之注意事項再填寫本頁) 又藉由以次篩網分粒器法使上述的複合金屬粉末之比 表面積成爲4 5 0 cm2/g以上,可降低作爲複合金屬粉 之通氣度,維持此特質並予成形、燒結,可得含油率或強 度均高的,且通氣度較低的軸承。至於此表面積之上限, 藉由用次篩網分粒器法設成7 5 0 cm2/g以上,使壓粉 成型時之對模具的塡充性良好且可容易成型。 再者,藉由將壓粉成型燒結體之通氣度設成3 X 1 0 — 11 cm2以上,可適當的保持軸承時之給油量,而且 本纸張尺度適用中國國家標準(CNS ) A4規格(210X297公釐) ~ 482825 Λ? ΙΓ 五、發明説明k ) 作成3 〇 X 1 o — 11 cm2以下,可阻止油壓的不均勻釋放 ’且確保對軸面之較宜的供油,及伴隨該供油之軸承作用 〇 且,藉由使含油率設成容量1 5%以上,可確保作爲 軸承體之適當耐用性,又藉由使成2 8容量%以下’確保 軸承體之強度,又可適度的獲得耐用性。再者,於本發明 者,亦可添加固體潤滑材或錫類低熔點金屬。再者’依本 發明者,係藉由添加低熔點金屬之錫或鉛之任一者或二者 Ο · 1〜2 wt%,使容易燒結,又可適當的改善軸承時 之試運轉性。 又依本發明者,係藉由添加固體潤滑材之石墨、二硫 化鉬、氮化硼之任一種或二種以上,可再降低軸承摺動時 之摩擦係數,使於長時間軸承時等之溫度上升降低。 實施例 實施例1 丨 經濟部中央標準局員工消费合作社印«. (請先閱讀背面之注意事項再填寫本頁) 對上述的依本發明者之具體的實施態樣,若同時說明 其比較例時,首先本發明人等使用的鐵粉係銅被覆量2 0 wt%者,一 80篩目,其比表面積爲573 cm3/g, 於實施例及比較例均將此物成形成內徑6mm、外徑1 2 mm、高度4mm之圓筒狀粉體,於氨分解氣中在 1 〇 0 0°C進行3 0分鐘之燒結處理。 所得的燒結體,係進行一段的分粒及油浸處理,成爲 含油率2 0容量%之軸承體,此等者係以下述條件進行軸 本紙張尺度適用中國國家標準(CNS ) A4規格(21〇x297公釐) 482825This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) ITI 482825 _______ B * 7 V. Description of the invention ¢ 2) The cost will be increased when it is obtained. At the same time, the copper layer forming the surface layer is too thick and the base of iron particles The material effect is not sufficiently obtained, so that there is a disadvantage that the folding performance of the bearing is poor. In addition, Japanese Patent Application Laid-Open No. 3-166303 has the disadvantages that it is complicated in the steps because it is a foil powder made of the same or alloyed metal as the coating layer, and it does not have stable characteristics.尤其 In particular, after the trial operation is completed, it is difficult to obtain the oil pressure released from the oil holes on the bearing's turning surface, and the ideal connection for oil-containing sintered bearings The inconvenience of the fluid-lubricated folding state. Although the aforementioned Japanese Patent Publication No. 7-5 4 1 2 6 mentioned the suppression of the air permeability mentioned above, this material has to be added to the copper-graphite composite powder, so the powder has to be expensive and sintered. There is a disadvantage that the strength of the body is reduced. Another example is the aforementioned Japanese Patent Laid-Open No. 8-2 0 8 36, which uses 30 ~ 60% copper-coated iron powder, and sintering in a zinc envelope gas to make the step of adsorbing zinc an essential element. Even if the characteristics are superior, the demand for copper is high, and sintering under the enveloping atmosphere of zinc is required, and the number of steps is increased. In any case, it has to be made expensive. Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling this page). To solve the above-mentioned problems, the present invention is to solve the above-mentioned problems of conventional technology. The powder is coated with a composite metal powder having a copper content of more than 1 wt% and less than 30 wt% of copper. The specific surface area of the composite metal powder is set to a specific range. The degree of certainty is set to a specific range. By making the oil content into a specific state, and even successful, the paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm)-5-482825 ____ B, _ __ 5. Description of the invention ( 3) to obtain suitable bearing performance at a lower cost. That is, according to the present inventor, by covering the iron powder with copper of 10% or more and covering the peripheral surface of the iron powder in a complete state, the corrosion resistance is improved, and at the same time, the test runability of the shaft material is good. . In addition, by making the amount of copper less than 30%, low cost can be ensured, and the effect of the base material of the coated iron particles can be appropriately obtained, and the bending performance of the bearing can be obtained stably. And there is no more specific method for coating copper on iron powder, but it is obtained by electroless plating. The copper coating is porous, with a large surface area, and it can reduce the air permeability in the state of powder. Traits. The particle size of the aforementioned copper-coated iron powder is less than 80 mesh, and since the size of less than 350 mesh is less than 30%, no special raw material powder is required. It is easy to use general powder metallurgy iron powder. The above-mentioned copper-coated iron powder has no difficulty in filling the mold, etc., and can be easily formed, and products can be produced at low cost. Printed by the Consumers' Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling in this page) and use the sub-sieve classifier method to make the specific surface area of the composite metal powder above 4 50 cm2 / Above g, the permeability of the composite metal powder can be reduced, and this characteristic can be maintained and preformed and sintered. Bearings with high oil content or strength and low permeability can be obtained. As for the upper limit of this surface area, by using a sub-sieve classifier method to set it to more than 750 cm2 / g, the filling property of the mold during powder compacting is good and it can be easily molded. In addition, by setting the air permeability of the powder compacted sintered body to 3 X 1 0 — 11 cm2 or more, the oil supply amount at the time of the bearing can be appropriately maintained, and the paper size applies the Chinese National Standard (CNS) A4 specification ( 210X297 mm) ~ 482825 Λ? ΙΓ V. Description of the invention k) Made 3 〇X 1 o — 11 cm2 or less, can prevent uneven release of oil pressure 'and ensure a more appropriate oil supply to the shaft surface, and the accompanying The role of the oil-supply bearing is 0. By setting the oil content to 15% or more of the capacity, proper durability as a bearing body can be ensured, and by 28% or less of the capacity, the strength of the bearing body can be ensured. Get moderate durability. Furthermore, the present inventors may add a solid lubricant or a tin-based low melting point metal. Furthermore, according to the present inventors, by adding either or both of low melting point metal tin or lead 0 or 1 to 2 wt%, it is easy to sinter, and it is possible to appropriately improve the test runability of the bearing. According to the inventor, by adding any one or more of graphite, molybdenum disulfide, and boron nitride to solid lubricating materials, the friction coefficient of the bearing when it is folded can be further reduced, so that it can be used for long-term bearings. The temperature rise decreases. EXAMPLES Example 1 丨 Printed by the Consumers' Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs «(Please read the precautions on the back before filling out this page) For the specific implementation of the inventor according to the above, if a comparative example is also described At first, if the iron powder copper coating amount used by the present inventors is 20 wt%, 80 meshes, and the specific surface area is 573 cm3 / g. In the examples and comparative examples, this material was formed into an inner diameter of 6 mm. A cylindrical powder with an outer diameter of 12 mm and a height of 4 mm was sintered in an ammonia decomposition gas at 1000 ° C for 30 minutes. The obtained sintered body is subjected to a stage of granulation and oil immersion treatment, and becomes a bearing body with an oil content of 20% by volume. These are used under the following conditions. The paper size of the shaft applies the Chinese National Standard (CNS) A4 specification (21 〇297mm) 482825
五、發明説明(5 ) 承試驗。 軸材:S45C原材 負載:0 · 81N/mm2,1 · 63N/mm2、 3 · 2 6 N / m m 2 滑移速度:52 · 9m/mi n 浸漬油:礦油3 · 2 c s t 且對上述的本發明例之比較例,係如下所述般。 比較例1,以與實施例1相同的條件,將粒度 一 1 00篩目,以表面積29 5 cm2/g之20重量%被 覆銅的鐵粉,製作軸承試料,以相同條件進行軸承試驗。 比較例2,將一 100篩目之還原鐵粉及一 15 0篩 目之電解銅粉依重量比8:2混合,以與實施例1相同的 條件,製作軸承試料,又以與實施例相同的條件進行軸承 試驗。 經濟部中央標準局員工消费合作社印製 (請先閱讀背面之注意事項再填寫本頁) 對前述的本發明材及比較材進行軸承試驗的結果,摩 耗量及軸承溫度上升(與室溫間之差異)係如下表1所示 ,此測定結果係表示各3個之平均値者,惟依本發明之實 施例者亦較比較例1,2較少溫度上升,可予充分確認出 耐摩耗性,摺動特性均優越的事實。 本紙張尺度適用中國國家標準(CNS) A4規格(210X297公釐)·8- 482825 Λ7 Η' 五 、發明説明(6 )表1 最高度上# mcc ) 最終溫度上昇値(°C )及摩耗量 0.81 1.63 3.26 0.81(N/mm2) 1.63(N/mm2) 3.26(N/mm2) (N/mm2) (N/mm2) (N/mm2) (°C ) 摩耗量# (°C ) 摩耗量# (°C ) 摩耗量β 實施例1 8 9 11 5 0.7 6 1.6 8 1.7 比較例1 7 10 24 7 2.9 8 2.4 17 2.8 比較例2 9 8 9 9 1.9 7 3.4 8 3.4 實施例2 12 15 16 8 0.5 10 1.0 11 1.2 實施例3 10 12 18 8 0.7 8 0.9 11 1.0 實施例4 8 8 11 5 1.0 5 1.8 10 2.0 實施例5 7 8 10 6 1.6 6 2.1 8 2.4 (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 本紙張尺度適用中國國家標準(CNS )A4規格(210X297公釐) _9- 482825 ______Η- _ 五、發明説明(7 ) 且對上述的本發明之實施例與比較例1,2者之含油 率、壓環強度、硬度及通氣度個自求得的結果,係如下表 2所示,含油率、強度、洛氏硬度則約略相同。又,比較 例2在通氣度方面亦較實施例稍高的程度。亦即,實施例 之軸承由於同時具備有3 Ο X 1 0_11 cm2以下的通氣度 及被覆銅之鐵之兩者的特性,本發明可製得優越的特性係 可予理解的。 (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標隼局員工消费合作社印製 本紙張尺度適用中國國家標準(CNS ) A4規格(210X297公釐)_ 1〇 - 482825 Λ7 B*7 五、發明説明(8 )表2 含油率(vol%) 壓環強度(N/mm2) 硬度(HRH) 通氣度(xi〇'ncm2) 實施例1 21.1 3.45 74 10.0 比較例1 20.8 3.33 72 51.0 比較例2 20.0 3.41 71 12.8 實施例2 20.2 4.54 83 20.1 實施例3 21.3 3.92 81 10.3 實施例4 20.3 3.15 71 7.3 實施例5 20.7 2.41 66 3.5 (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消费合作社印製 本紙張尺度適用中國國家標準(CNS ) A4規格(210X297公釐) _ 11 - 4828255. Description of the invention (5) Undertake test. Shaft material: S45C Raw material load: 0 · 81N / mm2, 1 · 63N / mm2, 3 · 2 6 N / mm 2 Sliding speed: 52 · 9m / mi n Immersion oil: Mineral oil 3 · 2 cst The comparative examples of the present invention are as follows. In Comparative Example 1, under the same conditions as in Example 1, a copper mesh iron powder was coated with a particle size of -100 mesh and a surface area of 295 cm2 / g at 20% by weight to produce a bearing sample, and the bearing test was performed under the same conditions. In Comparative Example 2, a 100-mesh reduced iron powder and a 150-mesh electrolytic copper powder were mixed according to a weight ratio of 8: 2, and bearing samples were made under the same conditions as in Example 1, and the same as in Example 1. Conditions for bearing tests. Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling this page). The results of bearing tests on the aforementioned inventive materials and comparative materials showed that the amount of friction and bearing temperature increased (between room temperature and room temperature) (Difference) is shown in Table 1 below. This measurement result represents the average of three of each, but the examples according to the present invention also have a lower temperature rise than Comparative Examples 1, 2 and can fully confirm the abrasion resistance. , The fact that the folding characteristics are superior. This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) 8-482825 Λ7 Η 'V. Description of the invention (6) Table 1 at the highest height # mcc) Final temperature rise 値 (° C) and friction loss 0.81 1.63 3.26 0.81 (N / mm2) 1.63 (N / mm2) 3.26 (N / mm2) (N / mm2) (N / mm2) (N / mm2) (° C) Friction consumption # (° C) Friction consumption # (° C) Friction consumption β Example 1 8 9 11 5 0.7 6 1.6 8 1.7 Comparative Example 1 7 10 24 7 2.9 8 2.4 17 2.8 Comparative Example 2 9 8 9 9 1.9 7 3.4 8 3.4 Example 2 12 15 16 8 0.5 10 1.0 11 1.2 Example 3 10 12 18 8 0.7 8 0.9 11 1.0 Example 4 8 8 11 5 1.0 5 1.8 10 2.0 Example 5 7 8 10 6 1.6 6 2.1 8 2.4 (Please read the precautions on the back before (Fill in this page) The paper size printed by the Employees' Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs applies the Chinese National Standard (CNS) A4 specification (210X297 mm) _9- 482825 ______ Η- _ 5. Description of the invention (7) The results obtained in Examples and Comparative Examples 1, 2 are oil content, ring strength, hardness, and air permeability. The results are shown in Table 2 below. The oil content, strength, and Rockwell hardness are as follows. Approximately the same. In addition, Comparative Example 2 was slightly higher in air permeability than Examples. That is, since the bearing of the embodiment has both the characteristics of air permeability below 30 × 1 0_11 cm2 and the properties of copper-coated iron, the superior characteristics that can be obtained by the present invention are understandable. (Please read the notes on the back before filling this page) The paper size printed by the Employees' Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs applies to the Chinese National Standard (CNS) A4 specification (210X297 mm) _ 10- 482825 Λ7 B * 7 V. Description of the invention (8) Table 2 Oil content (vol%) Ring strength (N / mm2) Hardness (HRH) Air permeability (xi〇'ncm2) Example 1 21.1 3.45 74 10.0 Comparative example 1 20.8 3.33 72 51.0 Comparison Example 2 20.0 3.41 71 12.8 Example 2 20.2 4.54 83 20.1 Example 3 21.3 3.92 81 10.3 Example 4 20.3 3.15 71 7.3 Example 5 20.7 2.41 66 3.5 (Please read the notes on the back before filling this page) Central Ministry of Economy Standard paper printed by the Consumer Cooperative of the Bureau of Standards is applicable to Chinese National Standard (CNS) A4 (210X297 mm) _ 11-482825
經濟部中央標隼局員工消費合作社印製 五、發明説明(9 ) 實施例i 對上述的實施例1之粉末加入錫粉1·Owt%,以 與實施例1相同條件製作相同形狀之燒結體。又對此燒結 體之軸承特性合倂表示於前述表1內,又含油率、強度、 硬度及通氣度亦合倂表示於前述表2。 實施例2 同樣的對實施例1之粉末添加錫粉1 · 8wt%,以 與上述的實施例1相同的條件,以燒結溫度爲8 6 0 °C燒 結相同形狀之燒結體並予製作。將此燒結體之軸承特性或 含油率合倂表示於前述表1、表2。 實施例4 於實施例1之粉末添加0 · 5wt%,以與實施例1 相同的條件,製作相同形狀之燒結體。再就此燒結體之軸 承特性或含油率等合倂表示於表述表1、表2內。 實施例5 除於實施例1之粉末內添加石墨粉末1.〇wt%, 燒結溫度設爲8 6 0 °C以外,餘與實施例1相同條件,製 作相同形狀之燒結體。對此燒結體之軸承特性或含油率亦 合倂表示於上述表1、表2內。 發明之功效 本紙張尺度適用中國國家標準(CNS ) A4規格(210X297公釐) (請先閱讀背面之注意事項再填寫本頁) 、訂 # 482825 R*7 五、發明説明(1〇 ) 如上述後,依本發明可簡單的且低成本的製得含油之 燒結軸承,而且摩擦稍小,試運轉性優越,可在不降低含 油率下,可適當的提供降低通氣度摩耗較少的耐用性優越 的軸承。 (請先閱讀背面之注意事項再填寫本I) 經濟部中央標隼局員工消费合作社印製 本紙張尺度適用中國國家標準(CNS ) A4規格(210X297公釐)-13 -Printed by the Consumers' Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 5. Description of the invention (9) Example i Add tin powder 1.Owt% to the powder of Example 1 above, and make a sintered body of the same shape under the same conditions as in Example 1. . The bearing characteristics of this sintered body are shown in Table 1 above, and the oil content, strength, hardness, and air permeability are also shown in Table 2 above. Example 2 Similarly, the powder of Example 1 was added with tin powder 1.8 wt%, and the same shape sintered body was sintered under the same conditions as in Example 1 above and sintered at a temperature of 860 ° C to make it. The bearing characteristics or oil content of this sintered body are shown in Tables 1 and 2 above. Example 4 To the powder of Example 1, 0.5 wt% was added, and a sintered body having the same shape was produced under the same conditions as in Example 1. A combination of bearing characteristics and oil content of the sintered body is shown in Tables 1 and 2 below. Example 5 A sintered body of the same shape was prepared under the same conditions as in Example 1 except that graphite powder was added to the powder of Example 1 in an amount of 1.0 wt% and the sintering temperature was set to 86 ° C. The bearing characteristics and oil content of this sintered body are also shown in Tables 1 and 2 above. Efficacy of the invention The paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling in this page), order # 482825 R * 7 5. Description of the invention (1〇) as above Later, according to the present invention, an oil-containing sintered bearing can be produced simply and at low cost, with slightly less friction and superior test performance. It can appropriately provide durability with reduced air permeability and friction without reducing oil content. Superior bearing. (Please read the notes on the back before filling in this I) Printed by the Employees' Cooperatives of the Central Bureau of Standards, Ministry of Economic Affairs This paper applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -13-