JP2019143211A - Gear and manufacturing method for gear - Google Patents

Gear and manufacturing method for gear Download PDF

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JP2019143211A
JP2019143211A JP2018029393A JP2018029393A JP2019143211A JP 2019143211 A JP2019143211 A JP 2019143211A JP 2018029393 A JP2018029393 A JP 2018029393A JP 2018029393 A JP2018029393 A JP 2018029393A JP 2019143211 A JP2019143211 A JP 2019143211A
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gear
pair
end surfaces
peripheral surface
carburizing
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JP7043878B2 (en
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雄介 河原木
Yusuke Kawaragi
雄介 河原木
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Nippon Steel Corp
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Abstract

To provide a gear and its manufacturing method in which a large difference is prevented from occurring in an inner diameter depending on positions in the axial direction.SOLUTION: The method for manufacturing an annular gear formed with a through-hole for fixing a shaft includes a suppression step for applying a carburizing inhibitor onto an annular gear material made of steel and having a through-hole, and a carburizing quenching step for subjecting a gear material having the carburizing inhibitor applied in the suppression step to a carburizing quenching treatment. The gear material includes a cylindrical portion having a pair of annular end surfaces at both end portions in the axial direction of the through hole, an inner peripheral surface connecting inner edges of the pair of end surfaces with each other, and an outer peripheral surface connecting outer edges of the pair of end surfaces with each other. The gear material also includes a plurality of gear teeth formed on the outer peripheral surface of the cylindrical portion. In the suppression step, the carburizing inhibitor is applied onto the pair of end faces.SELECTED DRAWING: Figure 4

Description

本発明は、シャフトを固定するための貫通孔を有する環状の歯車およびその製造方法に関する。   The present invention relates to an annular gear having a through hole for fixing a shaft and a method for manufacturing the same.

自動車および産業機械（以下、自動車等と記載する。）において構成部材として使用される歯車には、高い応力が繰り返し付与される。このため、自動車等に使用される歯車には、優れた耐疲労性および耐摩耗性を備えることが要求される。そこで、従来、自動車等においては、肌焼鋼からなる歯車素材に浸炭焼入れ処理を施すことによって製造された歯車が利用されている（例えば、特許文献１参照）。   High stress is repeatedly applied to gears used as components in automobiles and industrial machines (hereinafter referred to as automobiles and the like). For this reason, gears used in automobiles and the like are required to have excellent fatigue resistance and wear resistance. Therefore, conventionally, in automobiles and the like, a gear manufactured by carburizing and quenching a gear material made of case-hardened steel is used (for example, see Patent Document 1).

図１は、自動車等において使用される歯車を製造するための歯車素材の一例を示す図であり、（ａ）は側面図、（ｂ）は（ａ）のｂ−ｂ線端面図である。図１に示す歯車素材１００から製造される歯車は、いわゆるベベルギアである。なお、図１（ｂ）には、歯車素材１００の軸心を一点鎖線で示している。   FIG. 1 is a view showing an example of a gear material for producing a gear used in an automobile or the like, in which (a) is a side view and (b) is an end view taken along the line bb of (a). The gear manufactured from the gear blank 100 shown in FIG. 1 is a so-called bevel gear. In FIG. 1B, the axis of the gear material 100 is indicated by a one-dot chain line.

図１を参照して、歯車素材１００の中心には、貫通孔１００ａが形成されている。歯車素材１００は、円筒部１０と、円筒部１０から円筒部１０の径方向外側に向かって突出する複数の歯１２とを有する。円筒部１０は、貫通孔１００ａの軸方向における両端部に設けられる環状の一対の端面１０ａ，１０ｂと、端面１０ａ，１０ｂの内縁同士を接続する内周面１０ｃと、端面１０ａ，１０ｂの外縁同士を接続する外周面１０ｄとを有する。複数の歯１２は、外周面１０ｄから円筒部１０の径方向外側に突出するように形成されている。歯車素材１００から製造された歯車において、貫通孔１００ａには、図示しないシャフトが挿入され、固定される。   Referring to FIG. 1, a through hole 100 a is formed at the center of the gear material 100. The gear material 100 includes a cylindrical portion 10 and a plurality of teeth 12 protruding from the cylindrical portion 10 toward the radially outer side of the cylindrical portion 10. The cylindrical portion 10 includes a pair of annular end surfaces 10a and 10b provided at both ends in the axial direction of the through hole 100a, an inner peripheral surface 10c that connects inner edges of the end surfaces 10a and 10b, and outer edges of the end surfaces 10a and 10b. And an outer peripheral surface 10d for connecting the two. The plurality of teeth 12 are formed so as to protrude radially outward of the cylindrical portion 10 from the outer peripheral surface 10d. In a gear manufactured from the gear blank 100, a shaft (not shown) is inserted and fixed in the through hole 100a.

歯車素材１００に対して浸炭焼入れ処理を施すことによって、耐疲労性および耐摩耗性に優れた歯車を製造することができる。ただし、歯車素材１００に浸炭焼入れ処理を施すことによって熱処理歪みが発生し、円筒部１０の内径（貫通孔１００ａの直径）が小さくなる。この点に関して、円筒部１０の内径の変形量が、軸方向において均一であれば、熱処理歪みによる寸法変化量を予め調査し、上記寸法変化量を考慮した大きさの貫通孔１００ａを形成すればよい。これにより、歯車の寸法精度の低下を防止することができる。   By subjecting the gear material 100 to carburizing and quenching, a gear excellent in fatigue resistance and wear resistance can be manufactured. However, when the gear blank 100 is subjected to carburizing and quenching, heat treatment distortion occurs, and the inner diameter of the cylindrical portion 10 (the diameter of the through hole 100a) is reduced. In this regard, if the amount of deformation of the inner diameter of the cylindrical portion 10 is uniform in the axial direction, the amount of dimensional change due to heat treatment strain is examined in advance, and the through hole 100a having a size that takes into account the amount of dimensional change is formed. Good. Thereby, the fall of the dimensional accuracy of a gear can be prevented.

特開２０１２−０１７４９９号公報JP 2012-017499 A

一方、熱処理歪みによる円筒部１０の内径の変化量が、軸方向において大きく変化する場合には、上記のように寸法変化量を考慮した大きさの貫通孔１００ａを形成することは難しい。このような場合には、例えば、浸炭焼入れ処理後に円筒部１０の内周面１０ｃを研削することによって、シャフトの嵌め合い精度の低下を防止する必要がある。   On the other hand, when the amount of change in the inner diameter of the cylindrical portion 10 due to heat treatment strain changes greatly in the axial direction, it is difficult to form the through hole 100a having a size that takes into account the dimensional change amount as described above. In such a case, for example, it is necessary to prevent a reduction in fitting accuracy of the shaft by grinding the inner peripheral surface 10c of the cylindrical portion 10 after the carburizing and quenching process.

しかしながら、円筒部１０の内周面１０ｃを研削する場合には、浸炭焼入れ処理によって内周面１０ｃに形成された浸炭層を部分的に削り取ることになり、歯車の品質向上の観点から好ましくない。また。研削加工を行うことによって生産性が低下するという問題も生じる。   However, when grinding the inner peripheral surface 10c of the cylindrical portion 10, the carburized layer formed on the inner peripheral surface 10c by the carburizing and quenching process is partially scraped off, which is not preferable from the viewpoint of improving the quality of the gear. Also. There also arises a problem that the productivity is lowered by grinding.

そこで、本発明は、軸方向における位置によって内径に大きな差が生じることが抑制された歯車およびその製造方法を提供することを目的としている。   Accordingly, an object of the present invention is to provide a gear and a method for manufacturing the same in which a large difference in the inner diameter is suppressed depending on the position in the axial direction.

（１）シャフトを固定するための貫通孔が形成された環状の歯車を製造する方法であって、
鋼からなりかつ貫通孔を有する環状の歯車素材に浸炭抑制材を設ける抑制工程と、
前記抑制工程において浸炭抑制材が設けられた歯車素材に浸炭焼入れ処理を施す工程と、を備え、
前記歯車素材は、前記貫通孔の軸方向における両端部に設けられる環状の一対の端面と、前記一対の端面の内縁同士を接続する内周面と、前記一対の端面の外縁同士を接続する外周面とを有する円筒部、および前記円筒部の前記外周面に設けられた複数の歯を備え、
前記抑制工程では、前記一対の端面に前記浸炭抑制材が設けられる、歯車の製造方法。 (1) A method of manufacturing an annular gear having a through hole for fixing a shaft,
A restraining step of providing a carburization restraining material on an annular gear material made of steel and having a through hole;
And carburizing and quenching the gear material provided with the carburization suppressing material in the suppressing step,
The gear material includes a pair of annular end surfaces provided at both ends in the axial direction of the through hole, an inner peripheral surface connecting inner edges of the pair of end surfaces, and an outer periphery connecting outer edges of the pair of end surfaces. A cylindrical portion having a surface, and a plurality of teeth provided on the outer peripheral surface of the cylindrical portion,
In the suppressing step, the gear carburizing suppression material is provided on the pair of end surfaces.

（２）前記抑制工程では、前記一対の端面に前記浸炭抑制材を塗布する、上記（１）に記載の歯車の製造方法。 (2) The gear manufacturing method according to (1), wherein in the suppressing step, the carburization suppressing material is applied to the pair of end surfaces.

（３）鋼からなりシャフトを固定するための貫通孔が形成された環状の歯車であって、
前記貫通孔の軸方向における両端部に設けられる環状の一対の端面と、前記一対の端面の内縁同士を接続する内周面と、前記一対の端面の外縁同士を接続する外周面とを有する円筒部、および前記円筒部の前記外周面に設けられた複数の歯を備え、
前記一対の端面の硬さはそれぞれ、前記内周面および前記外周面の硬さに対して、３００ＨＶ以上低い、歯車。 (3) An annular gear made of steel and having a through hole for fixing the shaft,
A cylinder having a pair of annular end surfaces provided at both end portions in the axial direction of the through hole, an inner peripheral surface connecting inner edges of the pair of end surfaces, and an outer peripheral surface connecting outer edges of the pair of end surfaces. And a plurality of teeth provided on the outer peripheral surface of the cylindrical portion,
Each of the pair of end faces has a hardness that is lower by 300 HV or more than the hardness of the inner peripheral face and the outer peripheral face.

本発明によれば、軸方向における位置によって内径に大きな差が生じることが抑制された歯車が得られる。   According to the present invention, it is possible to obtain a gear in which a large difference in the inner diameter is suppressed depending on the position in the axial direction.

図１は、歯車素材を示す図である。FIG. 1 is a diagram showing a gear material. 図２は、解析モデルを示す図である。FIG. 2 is a diagram illustrating an analysis model. 図３は、解析で設定したヒートパターンを示す図である。FIG. 3 is a diagram showing a heat pattern set in the analysis. 図４は、解析結果を示す図である。FIG. 4 is a diagram showing an analysis result.

（本発明者による検討）
本発明者は、ＦＥＭ解析を行うことによって、環状の歯車素材に対して浸炭焼入れ処理を施す際に、歯車素材の内周面に生じる熱処理歪みについて調査した。具体的には、図２に示す二次元軸対称の解析モデル５０を用いて、図３に示すヒートパターンで浸炭焼入れ解析を行った。なお、図２に示す解析モデル５０は、ベベルギアの素材を模擬したモデルであり、中心に貫通孔５０ａが形成されている。図２においては、解析モデル２０の軸心を一点鎖線で示している。解析モデル５０は、図１の歯車素材１００と同様に、円筒部２０を有する。円筒部２０は図１の円筒部１０と同様に、一対の端面２０ａ，２０ｂと、内周面２０ｃと、外周面２０ｄとを有する。なお、図３中の「Ｃｐ」はカーボンポテンシャルを表し、「１２０℃油焼入れ」は油温１２０℃の油中で歯車素材を冷却することを表す。 (Study by the present inventor)
This inventor investigated the heat processing distortion which arose in the internal peripheral surface of a gear raw material when performing a carburizing quenching process with respect to an annular gear raw material by performing FEM analysis. Specifically, carburizing and quenching analysis was performed with the heat pattern shown in FIG. 3 using the two-dimensional axisymmetric analysis model 50 shown in FIG. The analysis model 50 shown in FIG. 2 is a model simulating a material of a bevel gear, and a through hole 50a is formed at the center. In FIG. 2, the axis of the analysis model 20 is indicated by a one-dot chain line. The analysis model 50 has a cylindrical portion 20 as with the gear material 100 of FIG. The cylindrical portion 20 has a pair of end surfaces 20a and 20b, an inner peripheral surface 20c, and an outer peripheral surface 20d, similarly to the cylindrical portion 10 of FIG. Note that “Cp” in FIG. 3 represents the carbon potential, and “120 ° C. oil quenching” represents that the gear material is cooled in oil at an oil temperature of 120 ° C.

浸炭焼入れ解析において、歯車素材の材料は、ＪＩＳ Ｇ ４０５３（２０１６）に規定されたＳＣＭ４２０とした。ヤング率および応力−歪線図等の機械的特性としては、ＳＣＭ４２０の実測データを用いた。また、比熱および熱伝導率等の熱的特性としては、ＳＣＭ４２０の化学成分に基づいて、予測式を用いて算出した値を用いた。冷却は、端面２０ｂが下方に位置するようにし、かつ解析モデル５０の軸心が油面に対して垂直になるようにして歯車素材を油中に浸漬して行うものとし、歯車素材の油中への浸漬速度は１００ｍｍ/ｓに設定した。   In the carburizing quenching analysis, the material of the gear material is SCM420 defined in JIS G 4053 (2016). The measured data of SCM420 was used as mechanical properties such as Young's modulus and stress-strain diagram. In addition, as thermal characteristics such as specific heat and thermal conductivity, values calculated using prediction formulas based on the chemical components of SCM420 were used. The cooling is performed by immersing the gear material in oil so that the end surface 20b is positioned below and the axis of the analysis model 50 is perpendicular to the oil surface. The immersion rate in was set to 100 mm / s.

また、本発明者は、浸炭層の形成と熱処理歪みとの関係を調査するために、円筒部２０の表面のうち端面２０ａ，２０ｂの浸炭を阻害して（すなわち、円筒部２０の表面のうち端面２０ａ，２０ｂを除く部分を浸炭して）、上記と同様の条件で浸炭焼入れ解析を行った。   Further, in order to investigate the relationship between the formation of the carburized layer and the heat treatment strain, the inventor inhibits the carburizing of the end faces 20a and 20b among the surfaces of the cylindrical portion 20 (that is, among the surfaces of the cylindrical portion 20). Carburizing and quenching analysis was performed under the same conditions as described above by carburizing the portions excluding the end faces 20a and 20b.

解析結果を図４に示す。図４において横軸は、円筒部２０の内径（貫通孔５０ａの直径）を示し、縦軸は、端面２０ａから下方への距離を示す。なお、図４においては、端面２０ａの上下方向における位置は０ｍｍであり、端面２０ｂの上下方向における位置は、２０ｍｍである。   The analysis results are shown in FIG. In FIG. 4, the horizontal axis indicates the inner diameter of the cylindrical portion 20 (the diameter of the through hole 50a), and the vertical axis indicates the distance from the end face 20a downward. In FIG. 4, the position of the end face 20a in the vertical direction is 0 mm, and the position of the end face 20b in the vertical direction is 20 mm.

図４に示した結果から、歯車素材に浸炭焼入れ処理を施す場合、端面２０ａ，２０ｂの浸炭を阻害した場合および阻害していない場合ともに、貫通孔５０ａの軸方向における中央部近傍の方が、端面２０ａ，２０ｂ近傍に比べて、円筒部２０の径方向内側への変形量が大きくなることが分かった。一方で、端面２０ａ，２０ｂの浸炭を阻害した場合の方が、浸炭を阻害しない場合に比べて、端面２０ａ，２０ｂ近傍において、円筒部２０の径方向内側への変形量が大きくなり、貫通孔５０ａの軸方向における中央部近傍において、円筒部２０の径方向内側への変形量が小さくなることも分かった。すなわち、軸方向における位置によって円筒部２０の内径の変化量に大きな差が生じることを抑制できることが分かった。   From the results shown in FIG. 4, when carburizing and quenching the gear material, both in the case where the carburizing of the end faces 20a and 20b is inhibited and in the case where it is not inhibited, the vicinity of the central portion in the axial direction of the through hole 50a is It has been found that the amount of deformation of the cylindrical portion 20 inward in the radial direction is larger than that in the vicinity of the end faces 20a and 20b. On the other hand, when the carburization of the end surfaces 20a and 20b is inhibited, the amount of deformation of the cylindrical portion 20 in the radial direction increases in the vicinity of the end surfaces 20a and 20b as compared with the case where the carburization is not inhibited. It has also been found that the amount of deformation of the cylindrical portion 20 inward in the radial direction is small in the vicinity of the central portion in the axial direction of 50a. That is, it has been found that a large difference in the amount of change in the inner diameter of the cylindrical portion 20 can be suppressed depending on the position in the axial direction.

端面２０ａ，２０ｂの浸炭を阻害することによって上記のように円筒部２０の内径の変化量に大きな差が生じることが抑制された理由は、以下のように考えられる。   The reason why the large difference in the change amount of the inner diameter of the cylindrical portion 20 as described above is suppressed by inhibiting the carburization of the end faces 20a and 20b is considered as follows.

焼入れ処理の冷却時には、マルテンサイト変態によって鋼が膨張する。これにより、円筒部２０のマルテンサイトが発生した箇所で周方向において圧縮応力が発生する。この点に関して、浸炭によって炭素濃度が高くなっている内周面２０ｃおよび外周面２０ｄの近傍部分では、変態温度が低いため、他の部分に比べてマルテンサイト変態の時期が遅れる。一方、端面２０ａ，２０ｂは浸炭が阻害されているので、内周面２０ｃおよび外周面２０ｄの近傍部分よりも早期にマルテンサイト変態し、膨張する。これにより、端面２０ａ，２０ｂの近傍部分において、内周面２０ｃおよび外周面２０ｄの近傍部分よりも早期に圧縮応力が発生し、端面２０ａ，２０ｂの近傍部分が径方向内側に変形しやすくなったと考えられる。その結果、端面２０ａ，２０ｂの浸炭を阻害しない場合に比べて、軸方向における位置によって円筒部２０の内径の変化量に差が生じることが抑制されたと考えられる。   During the quenching cooling, the steel expands due to martensitic transformation. Thereby, a compressive stress is generated in the circumferential direction at a location where martensite is generated in the cylindrical portion 20. In this regard, in the vicinity of the inner peripheral surface 20c and the outer peripheral surface 20d where the carbon concentration is high due to carburization, the transformation temperature is low, so the martensitic transformation time is delayed as compared with the other portions. On the other hand, since the end surfaces 20a and 20b are inhibited from carburizing, they undergo martensitic transformation and expand earlier than the vicinity of the inner peripheral surface 20c and the outer peripheral surface 20d. Thereby, compressive stress is generated earlier in the vicinity of the end surfaces 20a and 20b than in the vicinity of the inner peripheral surface 20c and the outer peripheral surface 20d, and the vicinity of the end surfaces 20a and 20b is easily deformed radially inward. Conceivable. As a result, it is considered that the difference in the amount of change in the inner diameter of the cylindrical portion 20 depending on the position in the axial direction is suppressed as compared with the case where the carburization of the end faces 20a and 20b is not inhibited.

（本発明の実施形態）
本発明は上記の知見に基づいてなされたものである。以下、本発明の実施の形態に係る歯車および製造方法について図面を参照しつつ説明する。以下においては、図１で説明した形状を有する歯車素材１００に浸炭焼入れ処理を施して歯車を製造する場合について説明する。 (Embodiment of the present invention)
The present invention has been made based on the above findings. Hereinafter, a gear and a manufacturing method according to an embodiment of the present invention will be described with reference to the drawings. In the following, a case where a gear is manufactured by subjecting the gear blank 100 having the shape described in FIG. 1 to carburizing and quenching will be described.

なお、歯車素材１００は、例えば、素材鋼を通常の方法で溶製した後、熱間で圧延又は鍛造し、更に必要に応じて熱処理を行い、次いで切削および圧造等によって所望の歯車形状とすることによって製造することができる。素材鋼としては、公知の種々の肌焼鋼を用いることができる。浸炭焼入れ処理のヒートパターンとしては、公知の浸炭焼入れ処理のヒートパターンを採用できるので、ヒートパターンの詳細な説明は省略する。   The gear material 100 is formed into a desired gear shape by, for example, cutting or forging after hot-rolling or forging after material steel is melted by a normal method, and then performing heat treatment as necessary. Can be manufactured. Various known case-hardened steels can be used as the material steel. As the heat pattern for the carburizing and quenching process, a known heat pattern for the carburizing and quenching process can be adopted, and thus a detailed description of the heat pattern is omitted.

本実施形態では、浸炭焼入れ処理の前に、歯車素材１００に対して抑制工程が実施される。抑制工程では、端面１０ａ，１０ｂの浸炭を抑制できる材料（浸炭抑制材）が端面１０ａ，１０ｂに設けられる。本実施形態では、例えば、浸炭抑制材を端面１０ａ，１０ｂに塗布してもよく、シート状の浸炭抑制材を端面１０ａ，１０ｂに貼り付けてもよい。なお、浸炭抑制材としては、端面１０ａ，１０ｂの浸炭を抑制できる公知の種々の材料を用いることでき、例えば、ホウ酸系化合物を主成分とする浸炭防止剤を用いることができる。より具体的には、浸炭抑制材として、例えば、コンドルサル（登録商標）を用いることができる。   In the present embodiment, a suppression step is performed on the gear material 100 before the carburizing and quenching process. In the suppressing step, the end surfaces 10a and 10b are provided with a material (carburizing suppressing material) that can suppress the carburizing of the end surfaces 10a and 10b. In the present embodiment, for example, a carburization suppressing material may be applied to the end faces 10a and 10b, or a sheet-like carburizing suppressing material may be attached to the end faces 10a and 10b. In addition, as a carburizing suppression material, the well-known various material which can suppress the carburizing of the end surfaces 10a and 10b can be used, For example, the carburizing inhibitor which has a boric acid type compound as a main component can be used. More specifically, for example, Condorsal (registered trademark) can be used as the carburization suppressing material.

なお、本実施形態では、端面１０ａ，１０ｂ以外の部分については、浸炭抑制材は設けられない。   In the present embodiment, the carburization suppressing material is not provided for portions other than the end faces 10a and 10b.

本実施形態では、上記のように抑制工程が実施された歯車素材１００に対して、浸炭焼入れ処理が施される。この場合、端面１０ａ，１０ｂにおける浸炭が抑制されるので、焼入れ処理の冷却時に、端面１０ａ，１０ｂの近傍部分は、内周面１０ｃおよび外周面１０ｄの近傍部分よりも早期にマルテンサイト変態し、膨張する。これにより、端面１０ａ，１０ｂの近傍部分において、内周面１０ｃおよび外周面１０ｄの近傍部分よりも早期に圧縮応力を発生させることができる。その結果、軸方向における位置によって円筒部１０の内径に大きな差が生じることを抑制できる。   In the present embodiment, carburizing and quenching is performed on the gear material 100 that has been subjected to the suppression process as described above. In this case, since carburization in the end faces 10a and 10b is suppressed, at the time of cooling in the quenching process, the vicinity of the end faces 10a and 10b undergoes martensitic transformation earlier than the vicinity of the inner peripheral face 10c and the outer peripheral face 10d, Inflate. Thereby, compressive stress can be generated in the vicinity of the end faces 10a and 10b earlier than the vicinity of the inner peripheral face 10c and the outer peripheral face 10d. As a result, it is possible to suppress a large difference in the inner diameter of the cylindrical portion 10 depending on the position in the axial direction.

なお、浸炭抑制材は、端面１０ａ，１０ｂの全面に設けられることが好ましいが、筒部１０の内径の軸方向における変化が抑制できるのであれば、端面１０ａ，１０ｂの一部が浸炭抑制材によって覆われていなくてもよい。   In addition, although it is preferable that a carburization suppression material is provided in the whole surface of end surface 10a, 10b, if the change in the axial direction of the internal diameter of the cylinder part 10 can be suppressed, a part of end surface 10a, 10b is carburization suppression material. It does not have to be covered.

上記のようにして製造された歯車では、内周面１０ｃ、外周面１０ｄおよび複数の歯１２の表面に浸炭層が形成される。また、上記のようにして製造された歯車では、端面１０ａ，１０ｂの硬さはそれぞれ、内周面１０ｃおよび外周面１０ｄの硬さに対して、ＪＩＳ Ｚ ２２４４（２００９）に規定されたビッカース硬さで３００ＨＶ以上低くなる。本実施形態では、端面１０ａ，１０ｂの径方向における中央位置の硬さはそれぞれ、内周面１０ｃおよび外周面１０ｄの軸方向における中央位置の硬さに対して、ＪＩＳ Ｚ ２２４４（２００９）に規定されたビッカース硬さで３００ＨＶ以上低い。   In the gear manufactured as described above, a carburized layer is formed on the inner peripheral surface 10 c, the outer peripheral surface 10 d, and the surfaces of the plurality of teeth 12. Further, in the gear manufactured as described above, the hardness of the end faces 10a and 10b is Vickers hardness defined in JIS Z 2244 (2009) with respect to the hardness of the inner peripheral face 10c and the outer peripheral face 10d, respectively. Now, it becomes lower by 300HV or more. In the present embodiment, the hardness at the center position in the radial direction of the end faces 10a and 10b is defined in JIS Z 2244 (2009) with respect to the hardness at the center position in the axial direction of the inner peripheral face 10c and the outer peripheral face 10d. The Vickers hardness is 300 HV or more lower.

なお、上述の実施形態では、歯車としてベベルギアを製造する場合について説明したが、本発明は、シャフトを固定するための貫通孔が形成された種々の形状の環状の歯車に適用できる。   In the above-described embodiment, the case where a bevel gear is manufactured as a gear has been described. However, the present invention can be applied to various shapes of annular gears in which a through hole for fixing a shaft is formed.

本発明によれば、軸方向における位置によって内径に大きな差が生じることが抑制された歯車が得られる。したがって、本発明に係る歯車は、自動車等において好適に利用できる。   According to the present invention, it is possible to obtain a gear in which a large difference in inner diameter is suppressed depending on the position in the axial direction. Therefore, the gear according to the present invention can be suitably used in an automobile or the like.

１０，２０ 円筒部
１０ａ，１０ｂ，２０ａ，２０ｂ 端面
１０ｃ，２０ｃ 内周面
１０ｄ，２０ｄ 外周面
５０ 解析モデル
１００ 歯車素材
１００ａ 貫通孔 DESCRIPTION OF SYMBOLS 10,20 Cylindrical part 10a, 10b, 20a, 20b End surface 10c, 20c Inner peripheral surface 10d, 20d Outer peripheral surface 50 Analysis model 100 Gear material 100a Through-hole

Claims (3)

シャフトを固定するための貫通孔が形成された環状の歯車を製造する方法であって、
鋼からなりかつ貫通孔を有する環状の歯車素材に浸炭抑制材を設ける抑制工程と、
前記抑制工程において浸炭抑制材が設けられた歯車素材に浸炭焼入れ処理を施す工程と、を備え、
前記歯車素材は、前記貫通孔の軸方向における両端部に設けられる環状の一対の端面と、前記一対の端面の内縁同士を接続する内周面と、前記一対の端面の外縁同士を接続する外周面とを有する円筒部、および前記円筒部の前記外周面に設けられた複数の歯を備え、
前記抑制工程では、前記一対の端面に前記浸炭抑制材が設けられる、歯車の製造方法。 A method of manufacturing an annular gear having a through hole for fixing a shaft,
A restraining step of providing a carburization restraining material on an annular gear material made of steel and having a through hole;
And carburizing and quenching the gear material provided with the carburization suppressing material in the suppressing step,
The gear material includes a pair of annular end surfaces provided at both ends in the axial direction of the through hole, an inner peripheral surface connecting inner edges of the pair of end surfaces, and an outer periphery connecting outer edges of the pair of end surfaces. A cylindrical portion having a surface, and a plurality of teeth provided on the outer peripheral surface of the cylindrical portion,
In the suppressing step, the gear carburizing suppression material is provided on the pair of end surfaces. 前記抑制工程では、前記一対の端面に前記浸炭抑制材を塗布する、請求項１に記載の歯車の製造方法。   The gear manufacturing method according to claim 1, wherein in the suppressing step, the carburization suppressing material is applied to the pair of end surfaces. 鋼からなりシャフトを固定するための貫通孔が形成された環状の歯車であって、
前記貫通孔の軸方向における両端部に設けられる環状の一対の端面と、前記一対の端面の内縁同士を接続する内周面と、前記一対の端面の外縁同士を接続する外周面とを有する円筒部、および前記円筒部の前記外周面に設けられた複数の歯を備え、
前記一対の端面の硬さはそれぞれ、前記内周面および前記外周面の硬さに対して、３００ＨＶ以上低い、歯車。 An annular gear made of steel and having a through hole for fixing the shaft,
A cylinder having a pair of annular end surfaces provided at both end portions in the axial direction of the through hole, an inner peripheral surface connecting inner edges of the pair of end surfaces, and an outer peripheral surface connecting outer edges of the pair of end surfaces. And a plurality of teeth provided on the outer peripheral surface of the cylindrical portion,
Each of the pair of end faces has a hardness that is lower by 300 HV or more than the hardness of the inner peripheral face and the outer peripheral face.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5291718A (en) * 1976-01-28 1977-08-02 Tsubakimoto Chain Co Partly heatttreated product and process for said heat treatment
JPS63163069A (en) * 1986-12-25 1988-07-06 Toyota Motor Corp Heat treatment method for ring gear
JP2002181164A (en) * 2000-12-13 2002-06-26 Toyota Motor Corp Gear of high strength and high accuracy
JP2009030083A (en) * 2007-07-25 2009-02-12 Shigumaa Giken Kk Surface hardening method of machine component
JP2010174289A (en) * 2009-01-28 2010-08-12 Kobe Steel Ltd Quenching method preventing heat-treatment strain

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5291718A (en) * 1976-01-28 1977-08-02 Tsubakimoto Chain Co Partly heatttreated product and process for said heat treatment
JPS63163069A (en) * 1986-12-25 1988-07-06 Toyota Motor Corp Heat treatment method for ring gear
JP2002181164A (en) * 2000-12-13 2002-06-26 Toyota Motor Corp Gear of high strength and high accuracy
JP2009030083A (en) * 2007-07-25 2009-02-12 Shigumaa Giken Kk Surface hardening method of machine component
JP2010174289A (en) * 2009-01-28 2010-08-12 Kobe Steel Ltd Quenching method preventing heat-treatment strain

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