JP2002005266A - Sintered gear and its production method - Google Patents

Sintered gear and its production method

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Publication number
JP2002005266A
JP2002005266A JP2000187382A JP2000187382A JP2002005266A JP 2002005266 A JP2002005266 A JP 2002005266A JP 2000187382 A JP2000187382 A JP 2000187382A JP 2000187382 A JP2000187382 A JP 2000187382A JP 2002005266 A JP2002005266 A JP 2002005266A
Authority
JP
Japan
Prior art keywords
tooth
gear
face
teeth
sintered
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
Application number
JP2000187382A
Other languages
Japanese (ja)
Other versions
JP3730482B2 (en
Inventor
Jun Sakai
純 酒井
Osamu Motai
理 馬渡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Resonac Corp
Original Assignee
Hitachi Powdered Metals Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Powdered Metals Co Ltd filed Critical Hitachi Powdered Metals Co Ltd
Priority to JP2000187382A priority Critical patent/JP3730482B2/en
Publication of JP2002005266A publication Critical patent/JP2002005266A/en
Application granted granted Critical
Publication of JP3730482B2 publication Critical patent/JP3730482B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Powder Metallurgy (AREA)
  • Gears, Cams (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a sintered gear having consistent density around the top and bottom area of its teeth and its production method. SOLUTION: On the rear face of a sintered gear having tooth on the flanged end, the rear face teeth are formed so as not mate with other gear when the sintered gear is used. The rear teeth have almost the similar shape as those at the end face and positioned in such a manner that their bottom faces meet the top faces of the end face teeth.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】この発明は傘歯車やスピロイ
ドギヤのように端面部に歯部がある焼結歯車及びその製
造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintered gear such as a bevel gear or a spiroid gear having a tooth portion at an end face and a method of manufacturing the same.

【０００２】[0002]

【従来の技術】軸孔を備え、ボス部の一側面にボス部よ
り大径のフランジ状部があり、フランジ状部の端面に歯
部がある歯車は、伝達軸の回転方向を変換する各種の装
置に用いられている。このような歯車としては傘歯車が
あり、その種類としては直歯（すぐば）、斜歯（はす
ば）、曲歯（まがりば）がある。これらの傘歯車のピッ
チ円錐角（回転軸心に対する歯すじの傾き角度）は、１
０〜８０度程度のものが多い。また、ピッチ円錐角が９
０度程度のものとしてはスピロイドギヤ等がある。2. Description of the Related Art Gears having a shaft hole, a flange portion having a diameter larger than that of the boss portion on one side surface of the boss portion, and a tooth portion on an end surface of the flange portion are provided with various types of gears for changing the rotation direction of a transmission shaft. Used in the device. As such gears, there are bevel gears, and as the types thereof, there are straight teeth (immediate), beveled teeth (helical), and curved teeth (curved). The pitch cone angle of these bevel gears (the inclination angle of the tooth trace with respect to the rotation axis) is 1
Many are about 0-80 degrees. The pitch cone angle is 9
Spiroid gears and the like at about 0 degrees are available.

【０００３】図３は、ピッチ円錐角が約７０度の直歯
（すくば）傘歯車の部分斜視図である。このような傘歯
車を粉末冶金法によって製作する場合は、歯部３及びボ
ス部２の上端面側を形成する歯面を施した上パンチと、
フランジ部１の外周面を形成するダイと、ダイに嵌合し
フランジ部下端面を形成する下外パンチ及びボス部２の
下端面を形成する下内パンチと、軸孔を形成するコアロ
ッドとで構成される成形金型を用い、金属粉末を圧縮し
て圧粉体を製作し、焼結する。また、必要に応じて焼結
体をサイジングしたり、焼入れや酸化被膜形成処理等の
後処理を施して焼結合金製歯車とする。FIG. 3 is a partial perspective view of a straight tooth (Suzuki) bevel gear having a pitch cone angle of about 70 degrees. When such a bevel gear is manufactured by the powder metallurgy method, an upper punch having a tooth surface forming the upper end surface side of the tooth portion 3 and the boss portion 2;
A die that forms the outer peripheral surface of the flange portion 1, a lower outer punch that fits into the die to form the lower end surface of the flange portion, a lower inner punch that forms the lower end surface of the boss portion 2, and a core rod that forms a shaft hole. Using a molding die to be formed, the metal powder is compressed to produce a green compact and sintered. Further, if necessary, the sintered body is subjected to post-processing such as sizing or quenching or an oxide film forming process to obtain a sintered alloy gear.

【０００４】[0004]

【発明が解決しようとする課題】このような端面部に歯
部を有する圧粉体を製作する場合、上パンチの歯形底部
に向かって粉末が充分に流動し難いため、圧粉体の歯先
側の密度が低くなる。このような現象は歯たけの割に歯
溝が狭いような歯形形状の場合には顕著になる。密度が
低いと、焼結体の強度が不足し、使用に耐えないもので
あったり、摩耗や破損の原因となる。このような場合、
圧粉成形を行う際の加圧力を高くして、圧粉体全体の密
度を高めて、圧粉体の歯先部の密度を規定の密度まで到
達させる方法が採られるが、成形プレスの加圧力を高く
する必要があること、金型の摩耗が速まること、必要の
ない部分の密度が高くなるため、材料に無駄が生じるこ
となどの課題があった。When such a green compact having a tooth portion at the end face is manufactured, the powder does not sufficiently flow toward the bottom of the tooth profile of the upper punch. Side density is reduced. Such a phenomenon is remarkable in the case of a tooth profile in which the tooth space is narrower than the tooth height. If the density is low, the strength of the sintered body is insufficient, and the sintered body cannot be used, or causes wear or breakage. In such a case,
A method is adopted in which the pressing force during compacting is increased to increase the density of the entire compact and the density of the tooth tip of the compact to reach a specified density. There have been problems such as the need to increase the pressure, the faster wear of the mold, and the increase in the density of unnecessary parts, resulting in waste of material.

【０００５】[0005]

【課題を解決するための手段】このような課題を解決す
るため、この発明では、フランジ部端面に歯部を有する
焼結歯車において、その歯部を有する端面の裏端面に、
焼結歯車を使用する際に相手歯車と噛み合うことがない
裏面歯部が設けられており、その裏面歯部は歯部の歯形
とほぼ相似形であり、かつ歯部の歯先面と裏面歯部の歯
底面が互いに対向している焼結歯車としたものである。In order to solve such a problem, according to the present invention, in a sintered gear having a tooth portion on an end surface of a flange portion, a back end surface of the end surface having the tooth portion is provided.
When using a sintered gear, there is provided a back tooth portion that does not mesh with the mating gear, and the back tooth portion is substantially similar to the tooth shape of the tooth portion, and the tooth tip surface and the back tooth of the tooth portion are provided. This is a sintered gear in which the tooth bottoms of the portions face each other.

【０００６】この発明の歯車は、直歯傘歯車、斜歯傘歯
車、曲歯傘歯車、ハイポイドギヤ、スピロイドギヤ、ゼ
ロールギヤのいずれでも対象とすることができる。The gear of the present invention can be any of a straight bevel gear, a helical bevel gear, a curved bevel gear, a hypoid gear, a spiroid gear, and a zelol gear.

【０００７】また、この発明の歯車の製造方法は、上パ
ンチと下パンチの各対向する端面にほぼ相似形の歯部を
備えており、上パンチの歯部の各歯先面と下パンチの歯
底面が互いに対向し噛み合うように組み付けられた粉末
成形金型を用い、ダイと下パンチ及びコアロッドを含む
成形金型のダイキャビティ内に充填された粉末を圧縮成
形し、フランジ部端面とその裏端面とに歯部を有する圧
粉体を製作することを骨子とする。In the method of manufacturing a gear according to the present invention, the upper punch and the lower punch are provided with substantially similar tooth portions on opposite end faces thereof, and the respective tooth tips of the upper punch and the lower punch are provided. Using a powder molding die assembled so that the tooth bottoms face and mesh with each other, the powder filled in the die cavity of the molding die including the die, the lower punch and the core rod is compression-molded, and the end face of the flange portion and its back surface are formed. The main point is to manufacture a green compact having a tooth portion on an end face.

【０００８】[0008]

【実施の形態】以下、図面を参照してこの発明の実施形
態を説明する。図１は、この発明を説明するための直歯
傘歯車の部分斜視図である。軸孔があるボス部２の上端
側が大径のフランジ部１となっており、フランジ部１の
上端面部が図３と同様にピッチ円錐角が約７０度の直歯
歯車となっている。この傘歯車の相手歯車は、ピッチ円
錐角が約２０度のもので、互いに噛み合って回転伝達軸
を直角として用いられる。図１に示した歯車は、従来の
直歯傘歯車を示した図３と外観上の異なる点は、歯部３
の裏側に、裏面歯部４があり、裏面歯部４は歯部３の歯
形と全く同じか、ほぼ相似形であると共に、歯部３の歯
先３ａと裏面歯部４の歯底４ｂ、及び歯部３の歯底３ｂ
と裏面歯部４の歯先４ａとが対向していることである。
また、歯車の内部においては、歯部３の歯先３ａ付近と
歯底３ｂ付近及び裏面歯部４の歯先４ａ付近の密度がほ
ば同等になっていることである。歯車として使用する
際、この裏面歯部４は伝達軸の回転方向を変換する機能
に関与しない。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial perspective view of a straight bevel gear for explaining the present invention. The upper end side of the boss portion 2 having the shaft hole is a large-diameter flange portion 1, and the upper end surface portion of the flange portion 1 is a straight-tooth gear having a pitch cone angle of about 70 degrees as in FIG. The mating gear of this bevel gear has a pitch cone angle of about 20 degrees, and meshes with each other to use the rotation transmission shaft at a right angle. The gear shown in FIG. 1 is different from the gear shown in FIG.
There is a back tooth portion 4 on the back side, and the back tooth portion 4 is exactly the same as or substantially similar to the tooth shape of the tooth portion 3, and the tooth tip 3 a of the tooth portion 3 and the tooth bottom 4 b of the back tooth portion 4, And the root 3b of the tooth portion 3
And the tooth tip 4a of the back side tooth part 4 is opposed.
Further, inside the gear, the densities of the vicinity of the tooth tip 3a of the tooth portion 3, the vicinity of the tooth bottom 3b, and the vicinity of the tooth tip 4a of the rear tooth portion 4 are almost equal. When used as a gear, the rear teeth 4 do not participate in the function of changing the rotation direction of the transmission shaft.

【０００９】図１は、直歯傘歯車でフランジ部１の外端
面側に歯車として機能する歯部３を有するものの例であ
るが、内側端面に歯車として機能する歯部があるもので
も同様に効果がある。また、この歯形に限らず、斜歯、
曲歯の場合でも同様に効果がある。FIG. 1 shows an example of a straight bevel gear having a tooth portion 3 functioning as a gear on the outer end face side of the flange portion 1. effective. In addition to this tooth profile, bevel teeth,
The same effect can be obtained with curved teeth.

【００１０】次に、図２は、図１に示す直歯傘歯車の圧
粉体を形成するための成形金型の概略縦断面図である。
この成形金型はダイ５に嵌合する下外パンチ７ｂ、下外
パンチ７ｂ及びコアロッド８とに嵌合する下内パンチ７
ａ、及び上パンチ６とで構成される粉末成形金型であ
る。上パンチ６の下端部には、成形体９の歯部３を造形
する歯形が形成されている。また、下外パンチ７ｂの上
端部にも成形体９の裏面歯部４を造形する歯形が形成さ
れている。これらの歯形は、成形体９の歯先３ａに対向
して裏面歯底４ｂが、歯底３ｂに対向して裏面歯先４ａ
が形成されるように上下のパンチ６、７ｂが組み立てら
れている。FIG. 2 is a schematic longitudinal sectional view of a molding die for forming the compact of the straight bevel gear shown in FIG.
The molding die includes a lower outer punch 7b fitted to the die 5, a lower outer punch 7b, and a lower inner punch 7 fitted to the core rod 8.
a and an upper punch 6. At the lower end of the upper punch 6, a tooth shape for forming the tooth portion 3 of the molded body 9 is formed. Further, a tooth profile for forming the back surface tooth portion 4 of the molded body 9 is formed also at the upper end of the lower outer punch 7b. These tooth profiles are such that the back tooth bottom 4b faces the tooth tip 3a of the molded body 9, and the back tooth tip 4a faces the tooth bottom 3b.
The upper and lower punches 6, 7b are assembled so as to form.

【００１１】成形する際は、まず上パンチ６を上昇させ
ておき、金型キャビティ内に粉末を充填する。次いで金
型装置の各部材を相対的に移動させ、各パンチにより圧
粉するものであり、図２は圧粉した状態を示すものであ
る。この過程では、図１の側面形状から分かるように、
歯部３の歯底３ｂ近辺の粉末の圧縮状態と、歯部３の歯
先３ａの付近の粉末の圧縮状態とがほば同程度となり、
歯先３ａ付近の密度と歯底３ｂ付近の密度とはほぼ同等
になる。At the time of molding, the upper punch 6 is first raised, and the mold cavity is filled with powder. Next, each member of the mold apparatus is relatively moved, and the powder is pressed by each punch. FIG. 2 shows a state where the powder is pressed. In this process, as can be seen from the side profile of FIG.
The compressed state of the powder near the tooth bottom 3b of the tooth part 3 and the compressed state of the powder near the tooth tip 3a of the tooth part 3 are almost the same,
The density near the tooth tip 3a and the density near the tooth bottom 3b are almost equal.

【００１２】この発明の方法及び歯車形状とすれば、例
えば、円ピッチが２ｍｍ、全歯たけが２．８ｍｍである
歯部３を有し、ピッチ円錐角が７０度の直歯傘歯車を鉄
系混合粉を用いて圧粉成形した場合、従来の方法によれ
ば、歯先３ａ部付近の密度を６．８ｇ／ｃｍ３にするた
めには、歯車全体の密度を７．２〜７．３ｇ／ｃｍ３と
しなければならなかったが、全体の密度と歯先３ａ部の
密度はほば同じになる。According to the method and the gear shape of the present invention, for example, a straight tooth bevel gear having a tooth portion 3 having a circular pitch of 2 mm and a total tooth height of 2.8 mm and a pitch cone angle of 70 degrees is made of iron. According to the conventional method, when the powder mixture is compacted using the system mixed powder, the density of the entire gear is 7.2 to 7.0 in order to make the density near the tooth tip 3a 6.8 g / cm 3 . Although it had to be 3 g / cm 3 , the density of the whole and the density of the tooth tip 3 a part are almost the same.

【００１３】なお、斜歯及び曲歯をもつ歯車において
は、成形の圧縮及び離型の際にパンチを回転する必要が
あるものがあり、このような場合は、斜歯歯車を成形す
ると同様に、パンチにベアリングを設けると共に回転手
段を設けた金型装置が用いられる。このような場合、得
られる成形体の歯部３の歯先３ａと裏面歯部４の裏面歯
底４ｂは、図１に示すように回転軸心方向に対向せず
に、歯部３の成形加圧方向に傾いた方向に対向させる。In some gears having helical teeth and curved teeth, it is necessary to rotate the punch during the compression and release of the molding. A mold device having a bearing provided on the punch and a rotating means is used. In such a case, the tooth tip 3a of the tooth part 3 and the back tooth bottom 4b of the back tooth part 4 of the obtained molded body do not face each other in the rotation axis direction as shown in FIG. They face each other in a direction inclined to the pressing direction.

【００１４】[0014]

【発明の効果】以上説明したように、本発明によれば、
歯先部の密度を他の部分の密度と同等に形成できるもの
であるから、必要以上に加圧することなく、強靭な焼結
歯車を提供することができる。As described above, according to the present invention,
Since the density of the tooth tip can be formed to be equal to the density of other parts, a tough sintered gear can be provided without excessively applying pressure.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の焼結歯車の一例である直歯傘歯車の部
分斜視図である。FIG. 1 is a partial perspective view of a straight bevel gear as an example of a sintered gear of the present invention.

【図２】本発明の焼結歯車用粉末成形金型の概略縦断面
図である。FIG. 2 is a schematic vertical sectional view of a powder molding die for a sintered gear of the present invention.

【図３】従来の焼結歯車の直歯傘歯車の部分斜視図であ
る。FIG. 3 is a partial perspective view of a conventional straight bevel gear of a sintered gear.

【符号の説明】[Explanation of symbols]

１ フランジ部 ２ ボス部 ３ 歯部 ３ａ 歯先 ３ｂ 歯底 ４ 裏面歯部 ４ａ 裏面歯先 ４ｂ 裏面歯底 ５ ダイ ６ 上パンチ ７ａ 下内パンチ ７ｂ 下外パンチ ８ コアロッド ９ 成形体 DESCRIPTION OF SYMBOLS 1 Flange part 2 Boss part 3 Tooth part 3a Tooth tip 3b Tooth bottom 4 Back tooth part 4a Back tooth tip 4b Back tooth bottom 5 Die 6 Upper punch 7a Lower inner punch 7b Lower outer punch 8 Core rod 9 Molded object

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ１６Ｈ 55/22 Ｆ１６Ｈ 55/22 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI theme coat ゛ (Reference) F16H 55/22 F16H 55/22

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 フランジ部端面に歯部を有する焼結歯車
において、その歯部を有する端面の裏端面に、使用の際
に相手歯車と噛み合うことがない裏面歯部を設け、その
裏面歯部は前記歯部の歯形とほぼ相似形で、かつ、歯部
の歯先面と裏面歯部の底面が互いに対向していることを
特徴とする焼結歯車。1. A sintered gear having teeth on an end face of a flange portion, the back end face of the end face having the teeth is provided with a back face tooth which does not mesh with a mating gear in use. Is a sintered gear having a shape substantially similar to the tooth profile of the tooth portion, wherein the tooth tip surface of the tooth portion and the bottom surface of the rear tooth portion face each other. 【請求項２】 前記歯車が、直歯（すぐば）傘歯車、斜
歯（はすば）傘歯車、曲歯（まがりば）傘歯車、ハイポ
イドギヤ、スピロイドギヤ、ゼロールギヤからなる群か
ら選ばれたいずれかの歯車である請求項１に記載の焼結
歯車。2. The gear according to claim 1, wherein the gear is selected from the group consisting of a straight bevel gear, a helical bevel gear, a curved bevel gear, a hypoid gear, a spiroid gear, and a zelol gear. The sintered gear according to claim 1, wherein the gear is one of the following. 【請求項３】 上パンチと下パンチの各対向する端面に
相似形の歯部を備えており、しかも上パンチの歯部の各
歯先面と下パンチの各歯底面が互いに対向するように配
置した粉末成形金型を用い、ダイと下パンチ及びコアロ
ッドを含む成形金型のダイキャビティ内に充填された粉
末を圧縮成形し、フランジ部端面とその裏端面とに歯部
を有する圧粉体を製作する工程、及びその圧粉体を焼結
する工程を含むフランジ部端面に歯部を有する焼結歯車
の製造方法。3. An upper punch and a lower punch are provided with similar tooth portions on opposite end surfaces thereof, and further, each tooth tip surface of the upper punch and each tooth bottom surface of the lower punch face each other. Using the placed powder molding die, the powder filled in the die cavity of the molding die including the die, the lower punch and the core rod is compression molded, and the green compact having teeth on the flange end face and the back end face thereof And a method of manufacturing a sintered gear having teeth on the end face of the flange portion, including a step of sintering the compact.
JP2000187382A 2000-06-22 2000-06-22 Sintered gear and manufacturing method thereof Expired - Lifetime JP3730482B2 (en)

Priority Applications (1)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000187382A JP3730482B2 (en) 2000-06-22 2000-06-22 Sintered gear and manufacturing method thereof

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP2005198216A Division JP4376834B2 (en) 2005-07-07 2005-07-07 Manufacturing method of sintered gear

Publications (2)

Publication Number Publication Date
JP2002005266A true JP2002005266A (en) 2002-01-09
JP3730482B2 JP3730482B2 (en) 2006-01-05

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110296183A (en) * 2019-08-03 2019-10-01 金华市宇辰粉末冶金有限公司 A kind of bevel gear set

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CN109163069A (en) * 2018-10-31 2019-01-08 金华市宇辰粉末冶金有限公司 A kind of new gear

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110296183A (en) * 2019-08-03 2019-10-01 金华市宇辰粉末冶金有限公司 A kind of bevel gear set

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