JPH02304243A

JPH02304243A - Gear

Info

Publication number: JPH02304243A
Application number: JP12607689A
Authority: JP
Inventors: Koshin Ban; 伴　康臣
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 1989-05-19
Filing date: 1989-05-19
Publication date: 1990-12-18

Abstract

PURPOSE:To enable the elimination of backlash at all times, and ensure the improvement of precision and the reduction of a vibration and a noise by forming the teeth of a gear with an elastic material, and a groove on each tooth from a both tip to at least a common pitch area including a radial plane equally dividing tooth thickness. CONSTITUTION:Gears 1 and 11 have each of teeth 1A, 1B and so forth, and 11A, 11B and so forth respectively made of a elastic material. In addition, the teeth have grooves 2 and 12. The teeth, therefore, is somewhat deformed when subjected to a load. Also, when the gears 1 and 11 are engaged with each other, backlash is not formed between the tooth surfaces of a pair of the engaged teeth 1A and 11A. Or rather, a slight load is applied between the tooth surfaces and the teeth 1A and 11A are so engaged with each other as to be slightly deformed. According to the aforesaid engagement, the teeth 1A, 1B and so forth, and 11A, 11B and so forth are elastically deformed, even if an error in the tooth shape and pitch of the gears 1 and 11, and the deflection or the like of teeth, shafts and bearings due to thermal expansion and load during operation take place. Consequently, the backlash can always be maintained at zero. According to the aforesaid construction, the precision of equipment can be improved and the vibration and noise levels thereof can be lowered.

Description

【発明の詳細な説明】〔発明の目的〕（産業上の利用分野）本発明は、精密機器の歯車機構に用いられる歯車に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a gear used in a gear mechanism of a precision instrument.

（従来の技術）第２図に示すように、従来の歯車は、歯形やピッチの誤
差、運転中の熱膨張、負荷による歯。(Prior Art) As shown in Figure 2, conventional gears suffer from errors in tooth profile and pitch, thermal expansion during operation, and teeth due to load.

軸、軸受部の撓みなどがあっても、かみ合いに支障がな
いように、かみ合っている１対の歯（４）と歯（５）の
歯面間に適当な隙間Ｓを設ける必要があった。この隙間
Ｓをバックラッシという。It was necessary to provide an appropriate gap S between the tooth surfaces of a pair of teeth (4) and teeth (5) that are meshing so that there is no problem with the meshing even if there is deflection of the shaft or bearing part. . This gap S is called backlash.

しかしながら、精密機器に使用する際、このバックラッ
シＳが機器の精度に悪影響を及ぼしていた。また、振動
や騒音を大きくする原因にもなっていた。However, when used in precision equipment, this backlash S had a negative effect on the accuracy of the equipment. It also caused increased vibration and noise.

（発明が解決しようとする課題）本発明は、精度に悪影響を及ぼし、振動や騒音を大きく
していたバックラッシをゼロにできる歯車を実現するこ
とを課題とし、本発明の目的もそこにある。(Problems to be Solved by the Invention) An object of the present invention is to realize a gear that can eliminate backlash, which adversely affects accuracy and increases vibration and noise, and that is also the purpose of the present invention.

[Structure of the invention]

（課題を解決するための手段）本発明の歯車は、歯が弾性のある材料で形成され且つ各
歯には歯厚を等分する半径方向の平面を含み歯の先端か
ら少なくともピッチ円に至る溝が設けられるように構成
される。(Means for Solving the Problems) The gear of the present invention has teeth formed of an elastic material, and each tooth includes a radial plane that equally divides the tooth thickness, extending from the tip of the tooth to at least the pitch circle. It is configured to be provided with a groove.

（作　用）本発明の歯車は、かみ合わせるとき、かみ合った歯と歯
の白面間にバックラッシを設けず、むしろ、歯面にわず
かに負荷をかけ、歯が弾性変形するくらいにしてかみ合
わせる。このようにかみ合わせると、歯形やピッチの誤
差、運転中の熱膨張、負荷による歯、軸、軸受部の撓み
などがあっても、歯に設けた溝の効果により歯形が弾性
変形するため、バックラッシをゼロに保ち続けることが
できる。(Function) When the gears of the present invention mesh, there is no backlash between the meshing teeth and the white surfaces of the teeth, but rather a slight load is applied to the tooth surfaces to the extent that the teeth are elastically deformed. When meshed in this way, even if there are errors in the tooth profile or pitch, thermal expansion during operation, or deflection of the teeth, shaft, or bearing due to load, the tooth profile will elastically deform due to the effect of the grooves provided on the teeth. Backlash can be kept at zero.

（実施例）以下、図面に示した実施例に基いて本発明の詳細な説明
する。(Example) Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

第１図に本発明一実施例の歯車を示す。歯車（１）は、
各ｍ　（ＩＡ）　、　（ＩＢ）　、・・・が弾性のある
材料、例えばプラスチック、硬質ゴムなどからできてお
り、さらに、各歯には、歯厚を２等分する半径方向の平
面を含み歯の先端からピッチ円（３）の内側まで延在す
る溝（２）がそれぞれ設けられている。また、歯車（１
）とかみ合う歯車（１１）も、各歯（１１＾）。FIG. 1 shows a gear according to an embodiment of the present invention. Gear (1) is
Each m (IA), (IB), ... is made of an elastic material, such as plastic, hard rubber, etc., and each tooth also includes a radial plane that bisects the tooth thickness. Each tooth is provided with a groove (2) extending from the tip to the inside of the pitch circle (3). Also, gear (1
) and the gear (11) that meshes with each tooth (11^).

（ＩＩＢ）、・・・が弾性のある材料、例えばプラスチ
ック。(IIB), ... is an elastic material, such as plastic.

硬質ゴムなどからできており、さらに、各歯には、歯厚
を２等分する半径方向の平面を含み歯の先端からピッチ
円（１３）の内側まで延在する溝−（１２）がそれぞれ
設けられている。It is made of hard rubber or the like, and each tooth has a groove (12) that includes a radial plane that bisects the tooth thickness and extends from the tip of the tooth to the inside of the pitch circle (13). It is provided.

上記構成の歯車（１）　、　（１１）は、各歯（ＩＡ）
、（ＩＢ）、・・・、（ＩＩＡ）、（１１１３）、・・
・が弾性のある材料でできている上に溝（２）、（１２
）が設けられているため、歯に負荷をかけると若干変形
する。歯車（１）と歯車（１１）とをかみ合わせるとき
、かみ合った１対の歯（ＩＡ）と＠　（ＩＩＡ）の歯面
間にはバツクラツシを設けず、むしろ歯面にはわずかに
負荷をかけ、歯（ＩＡ）、（ＩＩＡ）が若干変形するく
らいにしてかみ合わせる。Gears (1) and (11) with the above configuration have each tooth (IA)
, (IB),..., (IIA), (1113),...
・The grooves (2) and (12) are made of an elastic material.
), the teeth deform slightly when a load is applied to them. When gear (1) and gear (11) are meshed, there is no backlash between the tooth surfaces of the pair of meshed teeth (IA) and @ (IIA), but rather a slight load is applied to the tooth surfaces. , teeth (IA), and (IIA) are interlocked so that they are slightly deformed.

このようにかみ合わせると、歯車（１）、（１１）の歯
形やピッチの誤差、運転中の熱膨張、負荷による歯、軸
、軸受部の撓みなどがあっても、歯（ＩＡ）。When meshed in this way, even if there are errors in the tooth profile or pitch of gears (1) and (11), thermal expansion during operation, or deflection of the teeth, shaft, or bearing due to load, the teeth (IA) will remain intact.

（ＩＢ）、・・・、（ＩＩＡ）、（ＩＩＢ）、・・・が
弾性変形するため、バックラッシをゼロに保ち続けるこ
とが可能である。Since (IB), . . . , (IIA), (IIB), . . . are elastically deformed, it is possible to keep the backlash at zero.

本発明一実施例の歯車を前述のようにかみ合わせて精密
機器の歯車機構部に使用すると、バ・ソクラッシを常に
ゼロに保ち続けることが可能なため、機器の精度を向上
させることができる。また、振動や騒音も低下させるこ
とができ、機器の故障低減につながる。When the gears of one embodiment of the present invention are meshed as described above and used in a gear mechanism of a precision instrument, it is possible to keep the bar crush at zero at all times, thereby improving the precision of the instrument. In addition, vibration and noise can also be reduced, leading to fewer equipment failures.

なお、本発明は、上述した実施例に限らず、次のように
変形して実施できる。Note that the present invention is not limited to the embodiments described above, and can be implemented with the following modifications.

（ａ）溝の形状２寸法および数に制限はない。(a) Shape 2 of the grooves There are no restrictions on the dimensions and number.

（ｂ）かみ合う一方の歯車のみを本発明の歯車にしても
同様な効果が得られる。(b) Similar effects can be obtained even if only one of the meshing gears is the gear of the present invention.

〔Effect of the invention〕

以上詳述したように本発明によれば、歯車の歯を弾性の
ある材料で形成し、且つ各歯には歯厚を等分する半径方
向の平面を含み歯の先端から少なくともピッチ円に至る
溝をそれぞれ設けた歯車を実現したことにより、かみ合
わせたときバックラッシを常にゼロに保ち続けることが
可能となり、この歯車を使用した機器の精度を向上させ
ることができる。また、振動や騒音も低下させることが
でき、機器の故障低減につながる。As detailed above, according to the present invention, the gear teeth are formed of an elastic material, and each tooth includes a radial plane that equally divides the tooth thickness, extending from the tip of the tooth to at least the pitch circle. By creating gears with individual grooves, it is possible to maintain zero backlash at all times when the gears are engaged, improving the precision of equipment that uses these gears. In addition, vibration and noise can also be reduced, leading to fewer equipment failures.

[Brief explanation of drawings]

第１図は本発明一実施例の歯車をかみ合わせた状態を示
す概略図、第２図は従来の歯車をかみ合わせた状態を示
す概略図である。１．１１・・・歯車、　　　　ＩＡ、ＩＢ・・・歯、１
１Ａ、ＩＩＢ・・・歯、　　　　２，１２・・・溝、３
．１３・・・ピッチ円。FIG. 1 is a schematic diagram showing a state in which gears according to an embodiment of the present invention are meshed, and FIG. 2 is a schematic diagram showing a state in which conventional gears are meshed. 1.11...gear, IA, IB...teeth, 1
1A, IIB... tooth, 2, 12... groove, 3
．． 13... Pitch circle.

Claims

[Claims]

A gear in which the teeth are made of an elastic material, and each tooth is provided with a groove that includes a radial plane that equally divides the tooth thickness and extends from the tip of the tooth to at least the pitch circle.