JPH0245061B2 - - Google Patents
Info
- Publication number
- JPH0245061B2 JPH0245061B2 JP62090889A JP9088987A JPH0245061B2 JP H0245061 B2 JPH0245061 B2 JP H0245061B2 JP 62090889 A JP62090889 A JP 62090889A JP 9088987 A JP9088987 A JP 9088987A JP H0245061 B2 JPH0245061 B2 JP H0245061B2
- Authority
- JP
- Japan
- Prior art keywords
- worm
- contact surface
- unevenness
- grinding
- height
- 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
- 239000000126 substance Substances 0.000 claims description 17
- 238000007739 conversion coating Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 239000011888 foil Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 7
- 239000010687 lubricating oil Substances 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002783 friction material Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Gears, Cams (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ウオーム軸に形成されたウオーム
と、該ウオームに噛合するウオームホイルにより
減速されるウオーム減速機に使用されるウオーム
に関し、更に詳しくは該ウオームの接触面形状及
びその製造方法に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a worm formed on a worm shaft and a worm used in a worm reducer that is decelerated by a worm foil meshing with the worm. relates to the shape of the contact surface of the worm and its manufacturing method.
（従来の技術）
ウオーム減速機は、第３図及び第４図に示す公
知の減速機のように、入力軸であるウオーム軸１
に形成されたウオーム２と、出力軸３に設けられ
たウオームホイル４とを互いに噛合させ、ウオー
ム軸１の回転を減速して出力軸３に伝達するもの
である。(Prior Art) A worm reducer, like the known reducer shown in FIGS. 3 and 4, has a worm shaft 1 which is an input shaft.
The worm 2 formed in the worm shaft 2 and the worm wheel 4 provided on the output shaft 3 are meshed with each other, and the rotation of the worm shaft 1 is decelerated and transmitted to the output shaft 3.
（発明が解決しようとする課題）
ウオーム減速機を小形化、高トルク化するに
は、ウオーム及びウオームホイルの歯形の接触面
が高力特性を有し、ウオームについては高硬度特
性も有していなければならない。(Problems to be Solved by the Invention) In order to make the worm reducer smaller and have higher torque, the contact surfaces of the worm and the tooth profile of the worm wheel must have high strength characteristics, and the worm must also have high hardness characteristics. There must be.
一方、高硬度特性に注目し過ぎると、その反面
で摩擦特性を犠性にすることになる。しかしなが
ら、摩擦特性に関しては、潤滑等によつて解決で
きるものの、実際にはウオームは高力特性及び高
硬度特性を有するが、比較的高い摩擦係数となつ
ている金属材料で製造されるのが通常であるた
め、ウオーム減速機では静的伝動効率と動的伝動
効率との差が大きく、ウオームとウオームホイル
の接触面の摩擦係数が大きくなりすぎると、起動
特性や初期なじみ特性に大きく影響を与える。従
つて、従来のウオーム減速機では、前記材料の選
定の困難さから伝動効率の低下を避けることので
きないものとなつていた。 On the other hand, if too much attention is paid to high hardness characteristics, friction characteristics may be sacrificed. However, although frictional characteristics can be solved by lubrication, etc., in reality, worms have high strength and hardness characteristics, but are usually manufactured from metal materials that have a relatively high coefficient of friction. Therefore, in a worm reducer, there is a large difference between static transmission efficiency and dynamic transmission efficiency, and if the friction coefficient of the contact surface between the worm and worm wheel becomes too large, it will greatly affect the starting characteristics and initial break-in characteristics. . Therefore, in the conventional worm speed reducer, a reduction in transmission efficiency cannot be avoided due to the difficulty in selecting the materials mentioned above.
そこで、歯形の接触面に弗素樹脂等の低摩擦材
料を内張りしたものや、ニツケルの薄い無電解皮
膜を付けて摩擦係数を低下させたもの等が提案さ
れているが、未だ十分に摩耗の問題が解決されて
いない。 Therefore, proposals have been made to line the contact surface of the tooth profile with a low-friction material such as fluororesin, or to reduce the coefficient of friction by attaching a thin electroless coating of nickel, but the problem of wear still remains. is not resolved.
又、一般的に歯形の接触面に燐酸塩皮膜等の化
成処理皮膜を形成し、該接触面の摩擦係数を低下
させることも公知であるが、この化成処理皮膜は
それ自体が低摩擦係数ではなく、微少な凹凸に多
量の潤滑油を保持しているために、低摩擦係数と
なるものである。 It is also generally known that a chemical conversion coating such as a phosphate coating is formed on the contact surface of the tooth profile to lower the friction coefficient of the contact surface, but this chemical conversion coating itself does not have a low friction coefficient. It has a low coefficient of friction because it holds a large amount of lubricating oil in the minute irregularities.
従つて、ウオームの接触面に上記公知の化成処
理皮膜を形成することも考えられるが、化成処理
皮膜は、それ自体摩耗し易く、皮膜が短時間で剥
がれてしまう結果となり、この場合も十分な問題
解決策とはなり得なかつた。 Therefore, it is possible to form the above-mentioned known chemical conversion coating on the contact surface of the worm, but the chemical conversion coating itself is easily abraded, resulting in the coating peeling off in a short period of time. It could not be a solution to the problem.
更に、ウオーム歯車の内の柔らかい方の歯車の
表面（接触面）の幅20μ、深さ30μ程度の溝を50μ
程度のピツチで縦横に形成することにより該溝に
潤滑油を溜めてならし運動時の潤滑性を向上させ
るものも公知である。（実公昭61−8278号公報参
照）
上記公知のウオーム歯車を製造するには、予め
ウオーム歯車の接触面を精密研削仕上げし、その
表面に更に溝加工を施すものとなので、製造工程
が増加した分だけ高コストとなる。 Furthermore, cut a groove of approximately 20μ in width and 30μ in depth on the surface (contact surface) of the softer gear of the worm gear by 50μ.
It is also known that the grooves are formed vertically and horizontally at a certain pitch so that lubricating oil is stored in the grooves to improve lubricity during running-in motion. (Refer to Utility Model Publication No. 61-8278) In order to manufacture the above-mentioned known worm gear, the contact surface of the worm gear must be precisely ground and finished, and the surface must be further grooved, which increases the number of manufacturing steps. The cost will be higher accordingly.
しかも、前記公知の縦横の溝はピツチが大きい
ため、接触荷重が凸側へ強く作用して摩耗が大き
くなるおそれがあつた。 Furthermore, since the known vertical and horizontal grooves have a large pitch, there is a risk that the contact load will strongly act on the convex side, resulting in increased wear.
更に、前記公知の溝はならし運転時のみの構成
であり、ならし運転が終了するまでには消滅する
ものであるから、潤滑性の向上は一時的なものと
なつている。 Furthermore, since the known grooves are configured only during the break-in operation and disappear before the break-in operation ends, the improvement in lubricity is only temporary.
更に加えて、前記公知のウオーム歯車はならし
運転時だけの潤滑性を向上させるものであるか
ら、縦横の溝の凹凸はならし運転が終了する程度
の期間で摩耗して消滅する。従つて、凹凸には化
成処理皮膜を形成させていない。 In addition, since the known worm gear improves lubricity only during the break-in operation, the unevenness of the vertical and horizontal grooves wears out and disappears within a period of time until the break-in operation is completed. Therefore, no chemical conversion film is formed on the irregularities.
そこで、本発明の目的はウオームの接触面の摩
擦係数を小さくし、伝動損失の低減を達成したウ
オーム及びその製造方法を提供することにある。 SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a worm and a method for manufacturing the same, which reduce the friction coefficient of the contact surface of the worm and reduce transmission loss.
又、本発明ではウオームの接触面を研削する際
の研削目で縦横の凹凸を形成することにより、製
造コストが低いウオームを提供することにある。 Another object of the present invention is to provide a worm with low manufacturing cost by forming vertical and horizontal irregularities with the grinding marks when grinding the contact surface of the worm.
（課題を解決するための手段）
上記目的を達成するため、本発明は歯形の研削
目の方向及び該研削目の方向と交差する方向に凹
凸が形成された接触面と、前記凹凸の高さよりも
低い膜厚で前記接触面に形成された化成処理皮膜
とからなることを特徴とするものである。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a contact surface in which unevenness is formed in the direction of the grinding marks of a tooth profile and in a direction intersecting the direction of the grinding marks, and a contact surface that is higher than the height of the unevenness. and a chemical conversion coating formed on the contact surface with a low thickness.
更に、本発明は所定方向及び該該所定方向と交
差する方向に研削し、該研削によつて凹凸を形成
して網目状の山部と谷部を形成した後、前記凹凸
の高さよりも低い膜厚で前記接触面に化成処理皮
膜を施してなることを特徴とするものである。 Furthermore, the present invention provides grinding in a predetermined direction and a direction crossing the predetermined direction, and after forming unevenness by the grinding to form mesh-like peaks and valleys, the height of the unevenness is lower than the height of the unevenness. It is characterized in that a chemical conversion coating is applied to the contact surface to a certain thickness.
（実施例）
以下、第１図及び第２図によつて、本発明の一
実施例を説明する。(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2.
一般にウオーム減速機のウオームとウオームホ
イルの噛合接触面は高精度を要求されるので、研
削加工によつて表面加工が施されている。 Generally, the meshing contact surface between the worm and worm wheel of a worm reducer requires high precision, so the surface is processed by grinding.
ウオーム軸１に設けたウオーム２の接触面５
は、第２図に示すように、砥石６により歯筋方向
（周方向）Ｘに研削されるので、第１図のイに示
すように歯筋方向に凹凸が残り、歯筋方向と直交
する歯丈方向Ｙ（第２図参照）にも図のＡで示す
山と、Ｂで示す谷とからなる研削目が残る。そし
て、山Ａの歯筋方向断面は図のロに示すように平
滑となる。 Contact surface 5 of worm 2 provided on worm shaft 1
is ground in the tooth trace direction (circumferential direction) Also in the tooth height direction Y (see Fig. 2), grinding marks consisting of peaks indicated by A and valleys indicated by B remain in the figure. The cross section of the mountain A in the tooth trace direction is smooth as shown in FIG.
今、第１図イ，ロで示すウオームの接触面に燐
酸塩処理、しゆう酸塩処理あるいはクロメート等
によつて化成処理皮膜Ｃを同図ハ，ニで示すよう
に施し、これをウオームホイルに噛合させたとす
ると、同図ホ，ヘに示すように短時間で摩耗し、
歯形の接触面の研削目の山Ａの化成処理皮膜Ｃが
完全に摩耗して剥がれてしまう。この化成処理皮
膜Ｃのない部分では作動油兼用の潤滑油を保持す
ることができないので、伝動機構の摩擦抵抗を高
めるものとなつている。 Now, a chemical conversion coating C is applied to the contact surface of the worm shown in Figure 1 A and B by phosphate treatment, oxalate treatment, chromate, etc. as shown in Figure 1 C and D, and this is applied to the worm foil. Assuming that they are engaged, they will wear out in a short period of time as shown in E and F of the same figure.
The chemical conversion coating C on the grinding grooves A on the contact surface of the tooth profile is completely worn away and peeled off. Since the portion without the chemical conversion coating C cannot hold lubricating oil that also serves as hydraulic oil, the frictional resistance of the transmission mechanism is increased.
ところが、本発明では第１図ト，チで示すよう
に、ウオームの接触面５の歯筋方向Ｘに砥石等に
よつて研削して凹凸を設け、歯丈方向Ｙにも山Ａ
と谷Ｂ（即ち、凹凸）を設ける。これにバレル加
工やシヨツトピーニングして山Ａの尖端を丸める
と共に歯筋方向（Ｙ方向）に同様に山Ａと谷Ｂ
（凹凸）を設け、この後に化成処理皮膜Ｃを施し
ている。この場合、山Ａと谷Ｂとの高さよりも化
成処理皮膜Ｃの膜厚を薄くしている。ここで、山
Ａと谷Ｂとの高さは1μないし10μとすることが望
ましく、化成処理皮膜Ｃの膜厚は山Ａと谷Ｂの高
さよりも若干低めの3μ程度とするのが望ましい。 However, in the present invention, as shown in FIG.
and valleys B (i.e., unevenness) are provided. This is then barrel-processed or shot peened to round the tip of the peak A, and the peak A and valley B are similarly shaped in the direction of the tooth trace (Y direction).
(irregularities) are provided, and then a chemical conversion coating C is applied. In this case, the thickness of the chemical conversion coating C is made thinner than the height of the peak A and the valley B. Here, the height of the peaks A and valleys B is preferably 1 to 10μ, and the thickness of the chemical conversion coating C is desirably about 3μ, which is slightly lower than the height of the peaks A and valleys B.
上記本発明のウオームによると、ウオームホイ
ルとの噛合後の摩耗状態が第１図リ，ヌに示すよ
うに歯形の接触面の歯筋方向と歯丈方向とに網目
状に残るものとなり、接触面のどの位置でも十分
に潤滑油を保持する。 According to the above-mentioned worm of the present invention, the wear state after meshing with the worm wheel leaves a mesh-like shape in the tooth trace direction and the tooth height direction of the contact surface of the tooth profile, as shown in FIG. Maintain sufficient lubrication on all surfaces.
（発明の効果）
以上のように、本発明ではウオームの噛合、接
触面のどの位置でも潤滑油が保持されるので、摩
擦係数は低減し、効率が向上し、起動時の特性も
向上する。(Effects of the Invention) As described above, in the present invention, lubricating oil is retained at any position on the meshing and contacting surfaces of the worms, so the coefficient of friction is reduced, efficiency is improved, and characteristics at startup are also improved.
又、制御機構では頻繁に間欠運転するので、潤
滑油膜の形成に不利なものとなつているが、本発
明によると、微少量の潤滑油が保持されること
と、どの位置でも潤滑油が保持されること等の利
点があるが、制御機構に使用した時に制御精度が
向上し、かつ伝動機構としての騒音低減、伝動効
率の向上、耐久性の増大が得られる。 In addition, the control mechanism frequently operates intermittently, which is disadvantageous for the formation of a lubricating oil film. However, according to the present invention, a minute amount of lubricating oil is retained and lubricating oil is retained at any position. However, when used in a control mechanism, it improves control accuracy, reduces noise as a transmission mechanism, improves transmission efficiency, and increases durability.
本発明では表面仕上げである研削による凹凸を
利用しているので、特別に溝を形成するものと比
べて、製造工程が低減した分だけ低コストとな
る。 Since the present invention utilizes the unevenness created by grinding as a surface finish, the cost is lower due to the reduction in manufacturing steps compared to a method in which grooves are specially formed.
又、研削によつて形成される凹凸のピツチは非
常に小さいため、それ自体でも摩耗が低減する。 Furthermore, since the pitch of the unevenness formed by grinding is very small, wear itself is reduced.
更に、本発明のウオームではならし運転期間の
みならず、それを越えて長期に亙つて潤滑性能を
向上させる。 Furthermore, the worm of the present invention improves lubrication performance not only during the break-in period but also over a long period of time.
第１図イないしヌは本発明を説明するための接
触面の断面図である。第２図はウオームの研削状
態を示す正面図である。第３図は公知のウオーム
減速機の一例を示す断面図である。第４図は第３
図のＡ−Ａ断面図である。
１：ウオーム軸、２：ウオーム、５：ウオーム
の接触面、６：砥石、Ｘ：歯筋方向、Ｙ：歯丈方
向、Ａ：山、Ｂ：谷、Ｃ：化成処理皮膜。
FIGS. 1A to 1D are cross-sectional views of the contact surface for explaining the present invention. FIG. 2 is a front view showing the grinding state of the worm. FIG. 3 is a sectional view showing an example of a known worm reducer. Figure 4 is the third
It is an AA sectional view of the figure. 1: Worm shaft, 2: Worm, 5: Worm contact surface, 6: Grindstone, X: Tooth trace direction, Y: Tooth height direction, A: Mountain, B: Valley, C: Chemical conversion coating.
Claims (1)
減速するウオーム減速機において、 歯形の研削目の方向及び該研削目の方向と交差
する方向に凹凸が形成された接触面と、前記凹凸
の高さよりも低い膜厚で前記接触面に形成された
化成処理皮膜とからなることを特徴とするウオー
ム。 ２ 特許請求の範囲第１項において、凹凸の高さ
が1μないし10μであることを特徴とするウオー
ム。 ３ ウオームの製造方法において、 所定方向及び該該所定方向と交差する方向に研
削し、該研削によつて凹凸を形成して網目状の山
部と谷部を形成した後、前記凹凸の高さよりも低
い膜厚で前記接触面に化成処理皮膜を施してなる
ことを特徴とするウオームの接触面の製造方法。 ４ ウオームの製造方法において、 所定方向及び該該所定方向と交差する方向に研
削し、該研削によつて凹凸を形成して網目状の山
部と谷部を形成した後、山部の尖端を丸める加工
を施し、その後に前記凹凸の高さよりも低い膜厚
で前記接触面に化成処理皮膜を施してなることを
特徴とするウオームの接触面の製造方法。[Claims] 1. Due to the engagement between the worm and the worm foil,
In a worm reducer that decelerates, the contact surface has an unevenness formed in the direction of the grinding marks of the tooth profile and the direction intersecting the direction of the grinding marks, and a film thickness formed on the contact surface is lower than the height of the unevenness. A worm characterized by comprising a chemical conversion treatment film. 2. The worm according to claim 1, characterized in that the height of the unevenness is 1 μ to 10 μ. 3. In a method for manufacturing a worm, grinding is performed in a predetermined direction and a direction intersecting the predetermined direction, and after forming unevenness by the grinding to form mesh-like peaks and valleys, the height of the unevenness is lower than the height of the unevenness. A method for manufacturing a contact surface of a worm, characterized in that a chemical conversion coating is applied to the contact surface with a low film thickness. 4. In the method for manufacturing a worm, the worm is ground in a predetermined direction and a direction intersecting the predetermined direction, and after the grinding forms unevenness to form mesh-like peaks and valleys, the tips of the peaks are 1. A method for manufacturing a contact surface of a worm, characterized in that the contact surface is rounded, and then a chemical conversion coating is applied to the contact surface with a film thickness lower than the height of the unevenness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9088987A JPS63256318A (en) | 1987-04-15 | 1987-04-15 | Contact surface of worm and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9088987A JPS63256318A (en) | 1987-04-15 | 1987-04-15 | Contact surface of worm and manufacture thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63256318A JPS63256318A (en) | 1988-10-24 |
| JPH0245061B2 true JPH0245061B2 (en) | 1990-10-08 |
Family
ID=14010987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9088987A Granted JPS63256318A (en) | 1987-04-15 | 1987-04-15 | Contact surface of worm and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63256318A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3077823B2 (en) * | 1991-05-20 | 2000-08-21 | 住友重機械工業株式会社 | Worm, worm wheel and method of manufacturing the same |
| JP2000126929A (en) * | 1998-10-23 | 2000-05-09 | Univ Saga | Treatment system for enhancing gear quality and barrel treatment device used therein |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS618278U (en) * | 1984-06-22 | 1986-01-18 | 不二サッシ株式会社 | Anchor for Satsushi window frame |
-
1987
- 1987-04-15 JP JP9088987A patent/JPS63256318A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS618278U (en) * | 1984-06-22 | 1986-01-18 | 不二サッシ株式会社 | Anchor for Satsushi window frame |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63256318A (en) | 1988-10-24 |
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