JP2924993B2 - Gear device - Google Patents
Gear deviceInfo
- Publication number
- JP2924993B2 JP2924993B2 JP12486294A JP12486294A JP2924993B2 JP 2924993 B2 JP2924993 B2 JP 2924993B2 JP 12486294 A JP12486294 A JP 12486294A JP 12486294 A JP12486294 A JP 12486294A JP 2924993 B2 JP2924993 B2 JP 2924993B2
- Authority
- JP
- Japan
- Prior art keywords
- gear
- hardened layer
- tooth
- layer
- gear device
- 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.)
- Expired - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、駆動用インボリュート
歯車と被駆動用インボリュート歯車とよりなる歯車装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear device comprising a driving involute gear and a driven involute gear.
【０００２】[0002]
【従来の技術と問題点】例えば、図９に示すように、歯
車はその歯面に硬化層２０ａ、２１ａを設け、耐衝撃性
や耐磨耗性を強化している。しかしながら、駆動歯車２
０の歯面の歯底付近２０ｂで凹部が発生する、いわゆる
ピッチング現象が生ずる。この理由は明確ではないが、
被駆動歯車２１の歯先２１ｂが係合する際に駆動歯車２
０の歯底付近で瞬間的に生ずる高面圧が繰返し作用し
て、表面に塑性流動が生じ凹欠部に成長するものと推定
される。2. Description of the Related Art As shown in FIG. 9, for example, a gear is provided with hardened layers 20a and 21a on its tooth surface to enhance impact resistance and abrasion resistance. However, drive gear 2
A so-called pitching phenomenon occurs in which a concave portion is generated in the vicinity of the root 20b of the 0 tooth surface. The reason for this is not clear,
When the tip 21b of the driven gear 21 is engaged, the driving gear 2
It is presumed that the high surface pressure instantaneously generated near the zero tooth bottom repeatedly acts, causing plastic flow on the surface and growing in the concave notch.
【０００３】[0003]
【知見】そして、ピッチングを防止するには被駆動歯車
の歯先の係合歯面を駆動歯車の歯面より柔らかくするこ
とによって、ピッチングが防止できることが種々の実験
により判った。[Knowledge] It has been found from various experiments that pitching can be prevented by preventing the pitching of the driven gear by making the engaging tooth surface of the tooth tip of the driven gear softer than the tooth surface of the driving gear.
【０００４】[0004]
【発明が解決しようとする課題】したがって、本発明
は、上記の知見に基ずき歯車噛合時のピッチングを防止
する歯車装置を提供する事を目的としている。SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a gear device that prevents pitching during gear engagement based on the above findings.
【０００５】[0005]
【課題を解決するための手段】本発明によれば、駆動用
インボリュート歯車と被駆動用インボリュート歯車とよ
りなる歯車装置において、前記駆動用インボリュート歯
車にはその歯面に硬化層が形成されており、前記被駆動
用インボリュート歯車にはその歯先付近を除いた歯面に
硬化層が形成され、その硬化層の形成されていない範囲
は歯丈の５〜１０％であり、そしてそれらの硬化層は表
面から一定の範囲がロックウエル硬度で６０ＨＲＣ以上
であって、硬化層の形成されていない部分は表面から一
定の範囲がロックウエル硬度で５０ＨＲＣ以下である。According to the present invention, in a gear device including a driving involute gear and a driven involute gear, a hardened layer is formed on a tooth surface of the driving involute gear. The hardened layer is formed on the tooth surface of the driven involute gear except for the vicinity of the tooth tip, and the area where the hardened layer is not formed is 5 to 10% of the tooth height. Is a Rockwell hardness of 60 HRC or more in a certain range from the surface, and a Rockwell hardness of 50 HRC or less in a part where the hardened layer is not formed from the surface.
【０００６】[0006]
【好ましい実施の態様】本発明の実施に際して非硬化層
を形成するには防炭材をそこに塗布しておき、そして滲
炭焼入れで硬化層を形成することができる。また、非硬
化層に溶融錫を塗布しておき、窒化処理で硬化層を形成
してもよい。さらに硬化層が滲炭焼入れまたは窒化処理
で形成され、非硬化層が高周波焼なましで形成してもよ
い。さらに、非硬化層は硬化層を研削して形成してもよ
い。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the practice of the present invention, to form a non-cured layer, a carbon-proof material is applied thereto, and the cured layer can be formed by carburizing and quenching. Alternatively, molten tin may be applied to the non-cured layer, and the cured layer may be formed by nitriding. Further, the hardened layer may be formed by carburizing quenching or nitriding, and the non-hardened layer may be formed by induction annealing. Further, the non-cured layer may be formed by grinding the cured layer.
【０００７】[0007]
【作用効果の説明】作動に際し、歯の接触開始時の面圧
により軟かい被駆動歯車の歯先が変形しやすく、馴染み
が早期に生じ、その後は接触開始時になめらかに接触す
る事ができるようになる。したがって、歯先の突込みを
受ける側、すなわち駆動歯車の歯面の塑性変形が進行し
ない。[Explanation of the operation and effect] In operation, the tooth tip of the soft driven gear is easily deformed due to the surface pressure at the start of contact of the teeth, so that familiarity occurs early, and thereafter smooth contact can be achieved at the start of contact. become. Therefore, plastic deformation of the tooth receiving side, ie, the tooth surface of the drive gear, does not progress.
【０００８】軟かい部分か歯丈の５％以下では接触に際
し、硬い部分と係合し、適当ではない。また、１０％以
上では普通噛合いでの耐久性が劣る。In the case of a soft part or less than 5% of the tooth height, it is not appropriate to engage with a hard part upon contact. On the other hand, if it is 10% or more, the durability in normal meshing is inferior.
【０００９】[0009]
【実施例】以下、図面を参照して、本発明の実施例を説
明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１０】図１において、全体を符号１で示す歯車の
歯は硬化層２と刃先の非硬化層３とで構成され、硬化さ
れていない非硬化層３の範囲は歯丈Ｈの５〜１０％にな
っている。そして、硬さ分布と硬さとの関係を示す図２
を参照して、硬化層２は表面から一定の範囲（例えば、
０．５ｍｍの範囲）はロックウエル硬度で６０ＨＲＣ以
上であり、非硬化層３は同じ範囲で５０ＨＲＣ以下であ
るように構成されている。In FIG. 1, the teeth of a gear generally designated by reference numeral 1 are composed of a hardened layer 2 and a non-hardened layer 3 having a cutting edge. %It has become. FIG. 2 shows the relationship between hardness distribution and hardness.
Referring to, the cured layer 2 is a certain range from the surface (for example,
(A range of 0.5 mm) is 60 HRC or more in Rockwell hardness, and the uncured layer 3 is configured to be 50 HRC or less in the same range.
【００１１】したがって、実験結果の例を示す図３を参
照して、ピッチング疲労寿命とトルクとの関係は、従来
の軟化処理を行わないＡグループの結果は本願の処理を
行ったＢグループの結果に比して、トルク値に拘らず繰
返し回数が１／１０以下の結果を示し、図８をも参照し
て、トルクが低い（Ｔ2)場合はピッチングが発生してい
ない。Therefore, referring to FIG. 3 showing an example of the experimental results, the relationship between the pitting fatigue life and the torque is as follows: the result of the group A without the conventional softening treatment is the result of the group B with the treatment of the present invention. 8 shows that the number of repetitions is 1/10 or less regardless of the torque value. Referring to FIG. 8, when the torque is low (T2), no pitching occurs.
【００１２】図４は歯車を滲炭処理により硬化層２に非
硬化層３を構成するために歯先に防炭処理を施す工程の
概要を示し、回転ドラム５の外周に粘度を高くした（例
えば高チクソトロピック性樹脂と混合）防炭材を塗布
し、その防炭材が歯車６の刃先に付着するよう構成され
ている。そして図５に示すようオーブン炉７で約１００
〜１８０℃で乾燥後に滲炭炉で滲炭処理すれば、刃先に
非硬化層３が形成される。FIG. 4 shows an outline of a step of applying a carburizing treatment to the tooth tips in order to form a non-hardened layer 3 on the hardened layer 2 by carburizing the gears, and increasing the viscosity around the rotating drum 5 ( For example, a carbon-proof material is mixed with a high thixotropic resin, and the carbon-proof material is attached to the cutting edge of the gear 6. Then, as shown in FIG.
If carburizing treatment is performed in a carburizing furnace after drying at ~ 180 ° C, the non-hardened layer 3 is formed on the cutting edge.
【００１３】図６は窒化処理で硬化層２と非硬化層３と
を構成する場合を示し、メッキ層１０に防窒材として溶
融錫を入れ、その中に回転ドラム１２を浸してドラム１
２の表面に溶融錫を付着させ、その錫の厚さはエアブラ
シ１３からエアを吹付けて調整し、そのドラムに歯車を
押付けて歯先に錫を付着させている。FIG. 6 shows a case where the hardened layer 2 and the non-hardened layer 3 are formed by nitriding treatment. A molten drum is put in a plating layer 10 as a nitric oxide material, and a rotary drum 12 is immersed in the tin.
The molten tin is adhered to the surface of No. 2 and the thickness of the tin is adjusted by blowing air from an airbrush 13 and the gear is pressed against the drum to adhere the tin to the tooth tip.
【００１４】それから、窒化処理すれば、歯先に非硬化
層を残すことができる。非硬化層の範囲は溶融錫の厚さ
を変えればよい。[0014] Then, by performing the nitriding treatment, a non-hardened layer can be left on the tooth tip. What is necessary is just to change the thickness of molten tin for the range of an unhardened layer.
【００１５】図７は歯先に非硬化層３の部分として研磨
代１５を設け、滲炭処理または窒化処理後に研磨代を研
削により除去して非硬化層３を構成する場合を示してい
る。したがって、いずれの方法によっても前記の効果を
得るように刃先の非硬化層を構成できるが、いずれを選
択するかは設備の保有状況等によればよく、効果の差異
はなく、本願の範囲を拘束するものでない。FIG. 7 shows a case in which a polishing allowance 15 is provided as a part of the non-hardened layer 3 on the tooth tip, and the non-hardened layer 3 is formed by removing the polishing allowance by grinding after carburizing or nitriding. Therefore, the non-hardened layer of the cutting edge can be configured so as to obtain the above-mentioned effects by any of the methods. Not binding.
【００１６】[0016]
【発明の効果】本発明は、上記のように構成されている
ので、以下の優れた効果を奏する。The present invention has the following advantages because it is configured as described above.
【００１７】（１） 摩擦作用が緩和されので、歯面に
は塑性流動層が形成されにくい。(1) Since the friction effect is reduced, a plastic fluidized bed is not easily formed on the tooth surface.
【００１８】（２） 疲労を起こすような応力作用が回
避出来る。(2) A stress effect that causes fatigue can be avoided.
【００１９】（３） したがって、歯面の剥離（ピッチ
ング）が起こらない。(3) Therefore, peeling (pitting) of the tooth surface does not occur.
【００２０】（４） 普通噛合いでの耐久性が向上す
る。(4) The durability in normal meshing is improved.
【図１】本発明の一実施例を示す歯車の歯の断面図。FIG. 1 is a sectional view of gear teeth showing an embodiment of the present invention.
【図２】硬化層と非硬化層の表面からの深さと硬さとの
関係を示す図。FIG. 2 is a view showing the relationship between the depth from the surface of a cured layer and the uncured layer and the hardness.
【図３】ピッチング疲労寿命と駆動トルクとの関係を示
す図。FIG. 3 is a diagram showing the relationship between pitting fatigue life and drive torque.
【図４】防炭材の塗布工程を示す図。FIG. 4 is a view showing a step of applying a carbon preventing material.
【図５】防炭材の乾燥炉を示す図。FIG. 5 is a view showing a drying furnace for a carbon-proof material.
【図６】溶融錫の塗布装置の模式図。FIG. 6 is a schematic view of an apparatus for applying molten tin.
【図７】非硬化層を研削するための研削代を示す図。FIG. 7 is a view showing a grinding allowance for grinding an uncured layer.
【図８】繰返し数とトルクとの関係の実験例を示す図。FIG. 8 is a diagram showing an experimental example of the relationship between the number of repetitions and torque.
【図９】駆動歯車に対する非駆動歯車の歯の突っ込みの
態様を示す図。FIG. 9 is a diagram showing an aspect of a tooth of a non-drive gear pushed into a drive gear.
１…歯車の歯 ２…硬化層 ３…非硬化層 ６…歯車 ７…オーブン炉 １０…メッキ層 １１…溶融錫 １５…研削代 DESCRIPTION OF SYMBOLS 1 ... Gear tooth 2 ... Hardened layer 3 ... Non-hardened layer 6 ... Gear 7 ... Oven furnace 10 ... Plating layer 11 ... Molten tin 15 ... Grinding allowance
フロントページの続き (56)参考文献 特開 昭63−109152（ＪＰ，Ａ) 特開 平５−253744（ＪＰ，Ａ) 特開 平７−54049（ＪＰ，Ａ) 特開 昭61−284519（ＪＰ，Ａ) 特開 平３−253582（ＪＰ，Ａ) 特開 平２−160428（ＪＰ，Ａ) 特開 昭52−131300（ＪＰ，Ａ) 特公 平２−14409（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.6，ＤＢ名) F16H 1/06 F16H 55/17 Continuation of the front page (56) References JP-A-63-109152 (JP, A) JP-A-5-253744 (JP, A) JP-A-7-54049 (JP, A) JP-A-61-284519 (JP) JP-A-3-253582 (JP, A) JP-A-2-160428 (JP, A) JP-A-52-131300 (JP, A) JP-A-2-14409 (JP, B2) (58) Field surveyed (Int.Cl. 6 , DB name) F16H 1/06 F16H 55/17
Claims (1)
ンボリュート歯車とよりなる歯車装置において、前記駆
動用インボリュート歯車にはその歯面に硬化層が形成さ
れており、前記被駆動用インボリュート歯車にはその歯
先付近を除いた歯面に硬化層が形成され、その硬化層の
形成されていない範囲は歯丈の５〜１０％であり、そし
てそれらの硬化層は表面から一定の範囲がロックウエル
硬度で６０ＨＲＣ以上であって、硬化層の形成されてい
ない部分は表面から一定の範囲がロックウエル硬度で５
０ＨＲＣ以下であることを特徴とする歯車装置。1. A gear device comprising a driving involute gear and a driven involute gear, wherein the driving involute gear has a hardened layer on its tooth surface, and the driven involute gear has A hardened layer is formed on the tooth surface excluding the vicinity of the tooth tip, the area where the hardened layer is not formed is 5 to 10% of the tooth height, and the hardened layer has a certain range from the surface with Rockwell hardness. In a portion where the hardness is 60 HRC or more and the hardened layer is not formed, a certain range from the surface is 5 in Rockwell hardness.
A gear device characterized by being at most 0 HRC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12486294A JP2924993B2 (en) | 1994-06-07 | 1994-06-07 | Gear device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12486294A JP2924993B2 (en) | 1994-06-07 | 1994-06-07 | Gear device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07332438A JPH07332438A (en) | 1995-12-22 |
| JP2924993B2 true JP2924993B2 (en) | 1999-07-26 |
Family
ID=14895944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12486294A Expired - Lifetime JP2924993B2 (en) | 1994-06-07 | 1994-06-07 | Gear device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2924993B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3388886B2 (en) * | 1994-07-11 | 2003-03-24 | ブリヂストンサイクル株式会社 | Bicycle transmission with floating toothed belt pulley |
| JP7077906B2 (en) * | 2018-10-12 | 2022-05-31 | トヨタ自動車株式会社 | Gear manufacturing method |
-
1994
- 1994-06-07 JP JP12486294A patent/JP2924993B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07332438A (en) | 1995-12-22 |
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