JPH02250901A - Magnetic powder for electromagnetic clutch - Google Patents
Magnetic powder for electromagnetic clutchInfo
- Publication number
- JPH02250901A JPH02250901A JP1071188A JP7118889A JPH02250901A JP H02250901 A JPH02250901 A JP H02250901A JP 1071188 A JP1071188 A JP 1071188A JP 7118889 A JP7118889 A JP 7118889A JP H02250901 A JPH02250901 A JP H02250901A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic powder
- electromagnetic clutch
- powder
- torque
- flux density
- 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.)
- Granted
Links
- 239000006247 magnetic powder Substances 0.000 title abstract description 26
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 230000004907 flux Effects 0.000 abstract description 12
- 238000002156 mixing Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 13
- 230000007423 decrease Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910017061 Fe Co Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910017060 Fe Cr Inorganic materials 0.000 description 1
- 229910002544 Fe-Cr Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は磁性粉体を磁化したと籾に各磁性粉体粒子間に
働く磁気的結合力を利用して回転力を伝達させる、いわ
ゆる電磁クラッチに使用される磁性粉体に関し、殊に耐
摩耗性に優れ且つ飽和磁束密度の高い電磁クラッチ用磁
性粉体に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention is a so-called electromagnetic technology that transmits rotational force to rice grains by magnetizing magnetic powder and utilizing the magnetic bonding force acting between each magnetic powder particle. The present invention relates to magnetic powder used in clutches, and particularly to magnetic powder for electromagnetic clutches that has excellent wear resistance and high saturation magnetic flux density.
［従来の技術］
電磁クラッチ用磁性粉体には数々の特性が求められてい
るが、なかでも透磁率や飽和磁束密度等の磁気的特性、
耐摩耗性等の機械的特性及び耐酸化性等の化学的特性が
重要視されている。磁気特性を重視した電磁クラッチ用
磁性粉体としてはＦｅ−Ｃｏ合金粉体（特公昭５４−９
３４５）が知られており、また耐酸化性を重視した電磁
クラッチ用磁性粉体としてはＦｅ−Ｃｒ系ステンレス鋼
粉体等が知られている。[Prior Art] Magnetic powder for electromagnetic clutches is required to have a number of properties, among which magnetic properties such as magnetic permeability and saturation magnetic flux density,
Mechanical properties such as wear resistance and chemical properties such as oxidation resistance are emphasized. As a magnetic powder for electromagnetic clutches that emphasizes magnetic properties, Fe-Co alloy powder (Special Publication Publication No.
345) is known, and as a magnetic powder for electromagnetic clutches with emphasis on oxidation resistance, Fe-Cr stainless steel powder and the like are known.
［発明が解決しようとする課題］
しかるに電磁クラッチの小型化要求は近年益々強まる傾
向にあり、１つのクラッチに使用される磁性粉体の量も
少なくなる傾向にある。その為飽和磁束密度のより高い
磁性粉体、すなわち同一電流下においてより高いトルク
を得ることので艶る磁性粉体が求められている。[Problems to be Solved by the Invention] However, the demand for miniaturization of electromagnetic clutches has been increasing in recent years, and the amount of magnetic powder used in one clutch has also been decreasing. Therefore, there is a need for a magnetic powder with a higher saturation magnetic flux density, that is, a magnetic powder that is glossy because it can obtain higher torque under the same current.
Ｆｅ−Ｃｏ合金粉体は磁気特性、特に飽和磁束密度の高
い磁性粉体であり、僅かな使用量でも高トルクを伝達で
きるという長所を有するが、硬度がそれほど高くないの
で耐摩耗性に劣るという欠点がある。従って電磁タラ多
チの使用中に磁性粉体が摩耗して微粉化し、粉体粒子間
の結合力が低下してトルクの低下を招くという問題を生
じる。Fe-Co alloy powder is a magnetic powder with high magnetic properties, especially saturation magnetic flux density, and has the advantage of being able to transmit high torque even with a small amount of use, but it is said to have poor wear resistance because its hardness is not very high. There are drawbacks. Therefore, during use of the electromagnetic treadmill, the magnetic powder is abraded and becomes fine powder, resulting in a problem that the bonding force between the powder particles decreases, leading to a decrease in torque.
また磁性粉体が微粉化すると、トルク切れ時間（電流を
切ってからトルクがＯとなるまでの時間）が長くなり、
しばらくの間、被駆動軸が廻り続ける現象が見られ、特
に速い応答が要求される用途において問題となる。In addition, when the magnetic powder becomes fine, the torque cut-off time (the time from when the current is turned off until the torque reaches zero) becomes longer.
A phenomenon in which the driven shaft continues to rotate for a while is observed, which is a problem especially in applications where fast response is required.
本発明はこうした事情に着目してなされたものであり、
充分な飽和磁束密度即ちトルク特性を有すると共に、耐
摩耗性に優れた電磁クラッチ用磁性粉体を提供すること
を目的とするものである。The present invention has been made focusing on these circumstances,
The object of the present invention is to provide a magnetic powder for an electromagnetic clutch that has sufficient saturation magnetic flux density, that is, torque characteristics, and has excellent wear resistance.
［課題を解決するための手段］
しかして上記目的を達成した本発明の電磁クラッチ用粉
体は、Ｓ ｉ ： ０．２〜７％、ＣＯ：５〜５０％を
含み、残部がＦｅ′ＢＬび不可避不純物からなる点に要
旨を有するものである。[Means for Solving the Problems] The powder for an electromagnetic clutch of the present invention that achieves the above object contains Si: 0.2 to 7%, CO: 5 to 50%, and the balance is Fe'BL. The main point is that it consists of unavoidable impurities.
［作用］
以下本発明に係る電磁クラッチ用磁性粉体の構成成分及
びその配合比率について夫々限定理由を説明する。[Function] The reasons for limiting the constituent components and their blending ratios of the magnetic powder for an electromagnetic clutch according to the present invention will be explained below.
Ｓ ｉ ： ０．２〜７％
Ｓｔは硬度の上昇に寄与する成分であり、硬度を高めて
磁性粉体の摩耗を防止するが、その為には０．２％以上
の添加が必要である。一方７％を超えて添加すると粉体
が脆くなって割れ易くなると共に飽和磁束密度の低下を
招くので必要以上の添加は避けなければならない。こう
した理由から本発明ではＳｉ添加量を０．２〜７％と規
定した。S i: 0.2 to 7% St is a component that contributes to increasing hardness and prevents wear of magnetic powder by increasing hardness, but for this purpose it is necessary to add 0.2% or more. . On the other hand, if it is added in excess of 7%, the powder becomes brittle and easily cracked, and the saturation magnetic flux density decreases, so it is necessary to avoid adding more than necessary. For these reasons, in the present invention, the amount of Si added is defined as 0.2 to 7%.
ＣＯ： ５〜５０％
電磁クラッチのトルク特性は磁性粉体の飽和磁束密度に
依存し、磁性粉体の飽和磁束密度は基本的にはＦｅの含
有量に比例する。即ちＦｅ以外の成分は、その含有量が
多くなるにつれて粉体の飽和磁束密度を低下させる。し
かるにＣＯは唯一例外的な元素であってその添加により
ＦｅｉびＦｅ基合金の飽和磁束密度を上昇させることが
できる。尚５％未満の添加ではその効果が詔められない
。５％以上添加することによってトルクの特性は向上し
、約３０〜３５％の含有量で最高値に達するが、それ以
上添加するとトルク特性は最高値から徐々に低下し、添
加量が５０％を超えるとＣｏ無添加の場合のトルク特性
と同等若しくはそれ以下となってしまう、従って磁気特
性殊にトルク特性の改善のためには５〜５０％、より好
ましくは２０〜４０％のＣｏを添加する必要がある。CO: 5 to 50% The torque characteristics of the electromagnetic clutch depend on the saturation magnetic flux density of the magnetic powder, and the saturation magnetic flux density of the magnetic powder is basically proportional to the Fe content. That is, as the content of components other than Fe increases, the saturation magnetic flux density of the powder decreases. However, CO is an exceptional element, and its addition can increase the saturation magnetic flux density of Fe and Fe-based alloys. If less than 5% is added, the effect cannot be evaluated. By adding 5% or more, the torque characteristics improve and reach the maximum value at about 30 to 35% content, but if more than 5% is added, the torque characteristics gradually decrease from the maximum value, and when the amount added exceeds 50%. If it exceeds this, the torque properties will be equal to or lower than those without Co. Therefore, in order to improve magnetic properties, especially torque properties, 5 to 50%, more preferably 20 to 40%, of Co should be added. There is a need.
尚Ｆｅ及びＣＯ以外の元素のうちＳＬについては前記し
た様に硬度を高める上で欠くことができないものである
が、その他の元素の添加は避けるべきである０例えばＡ
ＩやＣｒ等の元素には高温耐酸化性を改善する効果があ
り、磁性粉体の用途によっては一般論としてその添加が
推奨されることもあるが、本発明ではこれらの元素の添
加による磁気特性の低下という悪影響を回避するという
主旨に基き、それらの添加は積極的に排除している。Of the elements other than Fe and CO, SL is indispensable for increasing hardness as described above, but addition of other elements should be avoided. For example, A
Elements such as I and Cr have the effect of improving high-temperature oxidation resistance, and their addition is generally recommended depending on the use of magnetic powder. Based on the purpose of avoiding the negative effect of deterioration of properties, the addition of these substances is actively excluded.
本発明に係る電磁クラッチ用磁性粉体は上記合金元素の
添加を必須とし、残部をＦｅ及び不可避不純物とするも
のであり、実質的にＳｉ、Ｃｏ。The magnetic powder for an electromagnetic clutch according to the present invention essentially contains the above-mentioned alloying elements, and the remainder is Fe and unavoidable impurities, which are substantially Si and Co.
Ｆｅ以外の高価な元素は含むことがなく、かかる構成を
満足することによって耐摩耗性並びに磁気特性に優れた
電磁クラッチ用磁性粉体を経済的に得ることができる。It does not contain any expensive elements other than Fe, and by satisfying this configuration, it is possible to economically obtain a magnetic powder for an electromagnetic clutch that has excellent wear resistance and magnetic properties.
［実施例］
第１表に示す成分組成のアトマイズ粉体を試作してその
硬度を測定すると共に、実装置の電磁クラッチに実際に
装填してトルク特性試験を行なった。また一部の粉体に
ついては５００時間使用後の実測トルク及びトルク切れ
時間を測定し、使用開始時のデータと比較した。結果は
第１．２表に示す通りであった。尚第１表中、Ａ１〜Ａ
７は実施例、Ｂ１〜Ｂ３は比較例、Ｃ１，Ｃ２は従来例
である。[Example] Atomized powder having the composition shown in Table 1 was produced as a prototype, its hardness was measured, and a torque characteristic test was conducted by actually loading it into an electromagnetic clutch of an actual device. In addition, for some of the powders, actual torque and torque cut-off time after 500 hours of use were measured and compared with the data at the start of use. The results were as shown in Table 1.2. In addition, in Table 1, A1 to A
7 is an example, B1 to B3 are comparative examples, and C1 and C2 are conventional examples.
第１．２表に示される様に、硬度が低く耐摩耗性に劣る
Ｂ３．Ｃ１，Ｃ２では微粉発生量が多く、トルクの低下
率及びトルク切れ時間の増加率がいずれも大きかった。As shown in Table 1.2, B3. has low hardness and poor wear resistance. In C1 and C2, the amount of fine powder generated was large, and the rate of decrease in torque and rate of increase in torque-out time were both large.
これに対して実施例粉体は、トルクの低下率及びトルク
切れ時間の増加率が共に小さく、良好な耐摩耗性を有し
ていることが確認された。On the other hand, it was confirmed that the Example powder had a small rate of decrease in torque and a small rate of increase in torque-out time, and had good wear resistance.
次にＡ１〜Ａ７の実施例粉体のＣｏ量と実測トルクとの
関係を示したのが第１図である。Next, FIG. 1 shows the relationship between the amount of Co and the actually measured torque of the powders of Examples A1 to A7.
第１図に示される様に、Ｓｔ量の多少によって若干のば
らつきはあるものの、５〜５０％のＣ。As shown in FIG. 1, although there is some variation depending on the amount of St, C is 5 to 50%.
の添加によってトルク特性の著しい向上が認められる。A significant improvement in torque characteristics is recognized by the addition of .
尚第１図には参考の為、Ｂｌ、Ｂ２のデータを示した。In addition, data for B1 and B2 are shown in FIG. 1 for reference.
第２図は、Ａ１〜Ａ７及びＢ２．Ｂ３について、Ｓｔ量
と硬度の関係を調べたものであり、Ｃｏ量の多少によっ
て若干のばらつきはあるが、Ｓｔの添加によって硬度の
増加することが確認された。FIG. 2 shows A1 to A7 and B2. Regarding B3, the relationship between the amount of St and the hardness was investigated, and although there was some variation depending on the amount of Co, it was confirmed that the hardness increased with the addition of St.
［発明の効果］
本発明は以上の様に構成されており、磁気特性に優れ、
且つ耐摩耗性に優れた電磁クラッチ用磁性粉体を経済的
に提供することができた。[Effects of the Invention] The present invention is configured as described above, has excellent magnetic properties,
In addition, it was possible to economically provide magnetic powder for electromagnetic clutches with excellent wear resistance.
第１図はＣｏ量と実測トルクとの関係を示すグラフ、第
２図はＳｔ量と硬度の関係を示すグラフである。FIG. 1 is a graph showing the relationship between Co amount and actually measured torque, and FIG. 2 is a graph showing the relationship between St amount and hardness.
Claims (1)
：５〜５０％を含み、残部がＦｅ及び不可避不純物から
なることを特徴とする電磁クラッチ用磁性粉体。Si: 0.2 to 7% (meaning of weight %, same below), Co
: 5 to 50%, and the remainder is Fe and inevitable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1071188A JPH0699722B2 (en) | 1989-03-22 | 1989-03-22 | Magnetic powder for electromagnetic clutch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1071188A JPH0699722B2 (en) | 1989-03-22 | 1989-03-22 | Magnetic powder for electromagnetic clutch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02250901A true JPH02250901A (en) | 1990-10-08 |
| JPH0699722B2 JPH0699722B2 (en) | 1994-12-07 |
Family
ID=13453435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1071188A Expired - Fee Related JPH0699722B2 (en) | 1989-03-22 | 1989-03-22 | Magnetic powder for electromagnetic clutch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0699722B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI401322B (en) * | 2008-01-22 | 2013-07-11 | Arcelormittal Stainless & Nickel Alloys | Fe-co alloy for an electromagnetic actuator having a large dynamic range |
| JP2018010938A (en) * | 2016-07-12 | 2018-01-18 | Tdk株式会社 | Soft magnetic metal powder and powder-compact magnetic core |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4857675A (en) * | 1971-11-18 | 1973-08-13 | ||
| JPS549345A (en) * | 1977-06-22 | 1979-01-24 | Shinko Electric Co Ltd | Magnetic powder for magnetic coupling device |
| JPS61154014A (en) * | 1984-12-27 | 1986-07-12 | Toshiba Corp | Dust core |
-
1989
- 1989-03-22 JP JP1071188A patent/JPH0699722B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4857675A (en) * | 1971-11-18 | 1973-08-13 | ||
| JPS549345A (en) * | 1977-06-22 | 1979-01-24 | Shinko Electric Co Ltd | Magnetic powder for magnetic coupling device |
| JPS61154014A (en) * | 1984-12-27 | 1986-07-12 | Toshiba Corp | Dust core |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI401322B (en) * | 2008-01-22 | 2013-07-11 | Arcelormittal Stainless & Nickel Alloys | Fe-co alloy for an electromagnetic actuator having a large dynamic range |
| JP2018010938A (en) * | 2016-07-12 | 2018-01-18 | Tdk株式会社 | Soft magnetic metal powder and powder-compact magnetic core |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0699722B2 (en) | 1994-12-07 |
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