JPH10219307A - Sintered gear - Google Patents
Sintered gearInfo
- Publication number
- JPH10219307A JPH10219307A JP2476097A JP2476097A JPH10219307A JP H10219307 A JPH10219307 A JP H10219307A JP 2476097 A JP2476097 A JP 2476097A JP 2476097 A JP2476097 A JP 2476097A JP H10219307 A JPH10219307 A JP H10219307A
- Authority
- JP
- Japan
- Prior art keywords
- gear
- density
- surface layer
- strength
- teeth
- 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.)
- Withdrawn
Links
Landscapes
- Gears, Cams (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は金属粉を用いて成
形、焼成することによって製造される焼結歯車に関する
ものであり、粉体成形品の特徴の一つである含油機能を
より効果的に活用すると共に全体の強度を向上させるよ
うにしたものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintered gear manufactured by molding and firing using metal powder, and more effectively improves the oil-impregnating function which is one of the features of a powder molded product. It is intended to be utilized and to improve the overall strength.
【０００２】[0002]
【従来の技術】金属粉を成形、焼成することによって製
造される焼結歯車は純鉄粉と種々の組成の金属粉あるい
は合金金属粉を混合し、これらの混合粉を型に充填して
成形焼成することによって製造される。このため得られ
る焼結歯車の特性は、成形に用いた金属粉に見合ったも
のとなり、かつ歯車全体が比較的均一な特性を示すもの
となる。このようなことから、多量の含油効果を目的と
する場合は低い密度とし、逆に強度を重視する場合は高
合金高密度化を図っていた。また、両特性を要求する場
合は高密度化を優先させ油やグリ−スを併用しているの
が現状である。2. Description of the Related Art A sintered gear manufactured by molding and firing metal powder mixes pure iron powder with metal powder or alloy metal powder having various compositions, and then forms a mixture by filling the mixed powder into a mold. It is manufactured by firing. Therefore, the characteristics of the sintered gear obtained are commensurate with the metal powder used for molding, and the entire gear exhibits relatively uniform characteristics. For this reason, when a large amount of oil-impregnating effect is intended, the density is set to be low, and when the strength is emphasized, the density of the alloy is increased. In addition, when both characteristics are required, it is the present situation that higher density is given priority and oil and grease are used in combination.
【０００３】[0003]
【発明が解決しようとする課題】本発明の目的は、焼結
体の特徴である含浸効果を減少させることなく、かつ高
強度を有する金属粉末焼成歯車を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to provide a metal powder fired gear having high strength without reducing the impregnation effect which is a characteristic of a sintered body.
【０００４】[0004]
【課題を解決するための手段】上記した目的は、混合す
る種々の金属粉または合金粉の種類とそれらの粉体粒子
径を適宜組合せることにより達成される。The above objects can be attained by appropriately combining various kinds of metal powders or alloy powders to be mixed and their particle diameters.
【０００５】[0005]
【発明の実施の形態】以下実施例図面を参照して本発明
を説明する。図１は本発明焼結歯車の製作手法の概略、
図２は図１による歯車の焼成後の断面の一部拡大を示し
たもの、図３は従来の製法による焼結歯車の製作手法、
図４はその焼成後の断面の一部拡大を示したものを模式
化して示したものである。夫々の図において、１、２は
成形型、３は微粒粉体充填域、４は仕切板、５は粗粒粉
体充填域、６は歯先、７は歯部、８は微粒粉体、９は粗
粒粉体、１０は気孔、１１は歯底を示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an outline of a manufacturing method of the sintered gear of the present invention,
FIG. 2 shows a partially enlarged cross section of the gear according to FIG. 1 after firing, and FIG. 3 shows a method of manufacturing a sintered gear by a conventional manufacturing method.
FIG. 4 is a schematic diagram showing a partially enlarged cross-section after firing. In each of the figures, reference numerals 1 and 2 denote a molding die, 3 denotes a fine powder filling area, 4 denotes a partition plate, 5 denotes a coarse powder filling area, 6 denotes a tooth tip, 7 denotes a tooth portion, 8 denotes a fine powder, 9 indicates coarse powder, 10 indicates pores, and 11 indicates a tooth bottom.
【０００６】従来より行われている手法では、成形型
１、２の中に同程度の粒子径からなる１種類または数種
の金属粉あるいは合金粉の混合粉を充填し成形してい
た。このため図４に示す如く、表面及び内部とも微粒子
粉体８よりなる比較的均一な焼結体となり、両者の特性
もまたほぼ同じものとなっていた。このため強度あるい
は耐摩耗性を付与する場合の対策は、粉体組成の選択と
成形圧すなわち密度の調節により行っていた。従って、
静的及び疲労強度を要求する場合は、合金粉を用いると
共に出きるだけ高密度化を図り、潤滑効果を得たい場合
は、逆に低密度化とするのが一般的であり、一体の成形
体において両者の特性を同時に得ることは困難であっ
た。 一方本発明による図１の手法では成形型１の中の金属粉
充填部分の中に仕切板４を設けることにより表層部の一
部に粗粒粉体充填域５を確保し、この部分に異質あるい
は粒子径の異なる金属粉体を充填することで、性質の異
なる２つの層からなる焼結体を得ることが可能となる。
このため歯車で最も耐摩耗性の必要とされる歯面の一部
を粗粒粉体９で構成することで気孔１０を多くし密度を
低くすることで含油効果を高め、潤滑効果を与えて耐摩
耗性を向上させることができる。更に歯車で強度の必要
とされる歯底１１は微粒粉８で構成することで密度を高
くし曲げ、疲労等の強度を向上させることが可能とな
る。In the conventional method, the molds 1 and 2 are filled with one or several kinds of mixed powders of metal powder or alloy powder having the same particle diameter. As a result, as shown in FIG. 4, a relatively uniform sintered body made of the fine particle powder 8 was obtained on both the surface and the inside, and the characteristics of both were almost the same. For this reason, measures for imparting strength or wear resistance have been made by selecting the powder composition and adjusting the molding pressure, that is, the density. Therefore,
When static and fatigue strength are required, alloy powders should be used and the density should be as high as possible. To obtain a lubricating effect, the density should generally be reduced. It was difficult to obtain both properties simultaneously in the body. On the other hand, in the method of FIG. 1 according to the present invention, the partition plate 4 is provided in the metal powder filling portion of the mold 1 to secure a coarse powder filling region 5 in a part of the surface layer portion, and the foreign material Alternatively, a sintered body composed of two layers having different properties can be obtained by filling metal powders having different particle diameters.
For this reason, a part of the tooth surface, which is most required for abrasion resistance in the gear, is composed of the coarse powder 9 to increase the number of pores 10 and decrease the density, thereby enhancing the oil-impregnating effect and giving the lubricating effect. Wear resistance can be improved. Further, by forming the tooth bottom 11 which requires strength by the gear with the fine powder 8, it is possible to increase the density, bend and improve the strength such as fatigue.
【０００７】ここで、請求項１記載の外周あるいは歯部
７の一部の表層部の焼結密度と他の部位を異なる密度と
したのは、表層部は低密度として含浸効果による潤滑性
を維持向上させるためであり、また他の部位と歯底１１
を高密度としたのは衝撃、曲げ、疲労等の強度を向上さ
せるためである。ここで表層部の密度を５．５〜６．５
ｇ／ｃｍ3としたのは、高い潤滑効果を得るためには含
浸させる油の量を多くする方が得策であること、あるい
は高粘度の油を含浸させる場合は、気孔１０の大きい方
が作業上の信頼性が向上するためで、６．５ｇ／ｃｍ3
以上では高速高面圧下において効果が少なくなるためで
あり、５．５ｇ／ｃｍ3以下では歯面強度そのものの低
下をきたすためである。 また他の部位あるいは歯底１１の密度を６．５〜７．４
ｇ／ｃｍ3としたのは、この部分に高強度を付与し歯元
の曲げ強度あるいは歯車を軸等に圧入した際に高い圧入
力を得ることが目的で、表層部に用いる金属粉粒子径と
成形時の加圧力によって得られる密度であるが、これ以
下の密度では動力伝達用として使用される歯車では、不
十分な強度となるためである。Here, the reason why the sintering density of the outer layer or part of the surface layer portion of the tooth portion 7 is different from that of the other portion is that the surface layer portion has a low density and lubricity due to the impregnation effect. In order to maintain and improve it, the other parts and the root 11
The reason why the density is increased is to improve the strength such as impact, bending and fatigue. Here, the density of the surface layer portion is set to 5.5 to 6.5.
The reason why the g / cm3 is set is that it is advisable to increase the amount of oil to be impregnated in order to obtain a high lubricating effect. 6.5 g / cm3
This is because the effect is less at high speed and high surface pressure, and at 5.5 g / cm3 or less, the tooth surface strength itself is reduced. In addition, the density of another part or the tooth bottom 11 is 6.5 to 7.4.
The purpose of g / cm3 is to impart high strength to this portion and obtain the bending strength of the tooth root or the high press force when the gear is pressed into a shaft or the like. The density obtained by the pressing force at the time of molding is lower than this, because the gear used for power transmission has insufficient strength.
【０００８】次に、請求項２記載の前記表層部の厚さを
０．１〜０．５モジュールとしたのは、上記したように
潤滑効果を得るためには十分な油の含浸が重要であり、
それを保持するための気孔１０が必要となるためであ
る。また、この部分に用いる金属粉末の粒子径を、３０
０〜６００μｍとしたのは、歯車全体を加圧成形した際
に表層部に内部より多くの気孔率を残すためである。 ここで、表層部の厚さを０．１〜０．５モジュールとし
たのは、これ以下の厚さでは十分な含油量を付与するた
めの気孔率を得にくく、また粉体の充填も困難となるた
めであり、０．５モジュール以上の厚さになると歯部全
体の強度が低下するためである。歯底１１及び他の部位
を構成する粉末の粒子径を５０〜２５０μｍとしたの
は、微粒子粉を用いることによる密度の向上すなわち機
械的強度の向上を図るためである。 次に請求項３に記載した気孔１０部を除く表層部の低密
度部分の基地の硬さをビッカース硬さで４００〜７００
としたのは、これ以下では耐摩耗性と機械的強度特性に
乏しく、高面圧高負荷の作用する歯車では使用に耐えに
くくなるためであり、またビッカース硬さで７００以下
としたのは、これ以上になると、靭性不足となって衝撃
負荷に耐えにくくなり、特に低密度とした歯面からの損
傷が発生し易くなるためである。Next, the reason why the thickness of the surface layer portion is set to 0.1 to 0.5 module according to claim 2 is that sufficient oil impregnation is important for obtaining a lubricating effect as described above. Yes,
This is because the pores 10 for retaining it are required. Further, the particle diameter of the metal powder used in this portion is set to 30
The reason for setting the thickness to 0 to 600 μm is to leave more porosity in the surface layer than inside the gear when the entire gear is pressed. Here, the reason why the thickness of the surface layer portion is set to 0.1 to 0.5 module is that if the thickness is less than this, it is difficult to obtain a porosity for providing a sufficient oil content, and it is difficult to fill the powder. When the thickness is 0.5 module or more, the strength of the entire tooth portion decreases. The particle diameter of the powder constituting the tooth bottom 11 and other parts is set to 50 to 250 μm in order to improve the density, that is, the mechanical strength by using the fine particle powder. Next, the hardness of the matrix in the low-density portion of the surface layer portion excluding 10 portions of the pores described in claim 3 is determined to be Vickers hardness of 400 to 700.
The reason for this is that if it is less than this, the wear resistance and mechanical strength characteristics are poor, and it is difficult to use the gear with high surface pressure and high load, and the Vickers hardness is 700 or less. If it is more than this, the toughness will be insufficient and it will be difficult to withstand an impact load, and damage from the low-density tooth surface will easily occur.
【０００９】以上のなかで耐摩耗性や強度、更に靭性点
から推奨する範囲は、対象とする歯車の要求特性によっ
ても異なるが、高速回転、中荷重の歯車の場合は、低密
度とする部分へ充填する粉体粒子は４００〜４５０μ
ｍ、高密度部分へ充填する金属粉の粒子は１００〜１５
０μｍ、また焼成後の密度は夫々６．０、７．０、熱処
理後の硬さはビッカース硬さで約６００とすることが望
ましい。[0009] Among the above, the recommended range in terms of wear resistance, strength, and toughness also varies depending on the required characteristics of the gear to be processed. 400-450μ powder particles
m, 100-15 particles of metal powder to be filled in high density part
It is preferable that the density after firing is 6.0 μm and the density after firing is 6.0 and the hardness after heat treatment is about 600 in Vickers hardness.
【００１０】[0010]
【発明の効果】粉体粒子の異なる同種、または異種金属
粉の組み合わせ成形及び燒結により、優れた耐摩耗性を
有する歯面と高強度を併せ持つ高耐摩耗性高強度歯車の
製作が可能となる．According to the present invention, it is possible to manufacture a high wear-resistant high-strength gear having both a tooth surface having excellent wear resistance and high strength by combining and sintering the same or different metal powders having different powder particles. .
【図１】本発明焼結歯車の成形法の一実施例を示す模式
図。FIG. 1 is a schematic view showing one embodiment of a method for forming a sintered gear of the present invention.
【図２】本発明焼結歯車の気孔分布を示す模式図。FIG. 2 is a schematic diagram showing a pore distribution of the sintered gear of the present invention.
【図３】従来の焼結歯車の成形法の一例を示す模式図。FIG. 3 is a schematic view showing an example of a conventional method of forming a sintered gear.
【図４】図３によって得られた焼結歯車の気孔分布を示
す模式図。FIG. 4 is a schematic view showing a pore distribution of the sintered gear obtained in FIG. 3;
１、２は成形型、３は微粒粉体充填域、４は仕切板、５
は粗粒粉体充填域、６は歯先、７は歯部、８は微粒粉
体、９は粗粒粉体、１０は気孔、１１は歯底である。1, 2 is a mold, 3 is a fine powder filling area, 4 is a partition plate, 5
Is a coarse powder filling area, 6 is a tooth tip, 7 is a tooth portion, 8 is a fine powder, 9 is a coarse powder, 10 is a pore, and 11 is a tooth bottom.
Claims (3)
系合金粉あるいは鉄粉のみの単一組成またはこれら両者
の混合組成からなる焼結金属歯車であって、 歯車の外周または歯の一部の表層部の密度を５．５〜
６．５ｇ／ｃｍ3として油の含浸効果を高めて耐摩耗性
を向上させると共に、歯底及び全体の高強度化を図る目
的から他の部位の密度を６．５〜７．４ｇ／ｃｍ3とし
て耐摩耗性と高強度を併せ持たせたことを特徴とする焼
結歯車。1. A sintered metal gear comprising a single composition of an iron-based alloy powder containing nickel, chromium, moriden, or the like, or a single composition of iron powder alone or a mixture of both, wherein the outer periphery of the gear or a part of teeth is The density of the surface layer is 5.5 to 5.5
At 6.5 g / cm 3 , the oil impregnation effect is enhanced to improve wear resistance, and the density of other parts is 6.5 to 7.4 g / cm 3 for the purpose of increasing the strength of the tooth bottom and the whole. A sintered gear characterized by having both wear resistance and high strength.
ュールとし、この部分に用いる金属粉の粒子径を３００
〜６００μｍ、また歯底及び他の部位を構成する金属粉
の粒子径を５０〜２５０μｍとしたことを特徴とする請
求項１記載の焼結歯車。2. The method according to claim 1, wherein the surface layer has a thickness of 0.1 to 0.5 module, and the metal powder used in this section has a particle diameter of 300.
The sintered gear according to claim 1, wherein the particle diameter of the metal powder constituting the tooth bottom and other parts is 50 to 250 m.
硬さをビッカース硬さで４００〜７００としたことを特
徴とする請求項１記載の焼結歯車。3. The sintered gear according to claim 1, wherein heat treatment such as carburizing or tempering is performed to set the hardness of the base to 400 to 700 in Vickers hardness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2476097A JPH10219307A (en) | 1997-02-07 | 1997-02-07 | Sintered gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2476097A JPH10219307A (en) | 1997-02-07 | 1997-02-07 | Sintered gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10219307A true JPH10219307A (en) | 1998-08-18 |
Family
ID=12147114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2476097A Withdrawn JPH10219307A (en) | 1997-02-07 | 1997-02-07 | Sintered gear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10219307A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6565341B2 (en) * | 2000-11-23 | 2003-05-20 | Robert Bosch Gmbh | Geared feed pump for supplying fuel to a high pressure fuel pump |
| JP2007262476A (en) * | 2006-03-28 | 2007-10-11 | Ntn Corp | Sintered machine part |
| JP2011231407A (en) * | 2011-06-30 | 2011-11-17 | Ntn Corp | Sintered machine component and method for production thereof |
| CN104043820A (en) * | 2014-05-26 | 2014-09-17 | 芜湖水泵制造有限公司 | Powder metallurgy gear with excellent performance |
-
1997
- 1997-02-07 JP JP2476097A patent/JPH10219307A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6565341B2 (en) * | 2000-11-23 | 2003-05-20 | Robert Bosch Gmbh | Geared feed pump for supplying fuel to a high pressure fuel pump |
| JP2007262476A (en) * | 2006-03-28 | 2007-10-11 | Ntn Corp | Sintered machine part |
| JP2011231407A (en) * | 2011-06-30 | 2011-11-17 | Ntn Corp | Sintered machine component and method for production thereof |
| CN104043820A (en) * | 2014-05-26 | 2014-09-17 | 芜湖水泵制造有限公司 | Powder metallurgy gear with excellent performance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20040511 |