JPH07332467A - Quiet sound gear - Google Patents
Quiet sound gearInfo
- Publication number
- JPH07332467A JPH07332467A JP12099594A JP12099594A JPH07332467A JP H07332467 A JPH07332467 A JP H07332467A JP 12099594 A JP12099594 A JP 12099594A JP 12099594 A JP12099594 A JP 12099594A JP H07332467 A JPH07332467 A JP H07332467A
- Authority
- JP
- Japan
- Prior art keywords
- gear
- tooth
- teeth
- gears
- addendum
- 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.)
- Pending
Links
Landscapes
- Gears, Cams (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＶＴＲ（ビデオ・テー
プ・レコーダー）等のＡＶ機器や音響機器などのリール
駆動用として好適な静音歯車に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silent gear suitable for driving a reel of AV equipment such as a VTR (video tape recorder) and audio equipment.
【０００２】[0002]
【従来の技術】従来のこの種の静音歯車を、ＶＴＲのリ
ール駆動系ギアについて、図２乃至図６とともに、以下
説明する。2. Description of the Related Art A conventional silent gear of this type will be described below with respect to a reel drive system gear of a VTR with reference to FIGS.
【０００３】まず、図２，図３は、それぞれＶＴＲのリ
ール駆動系を示す概略上面図，概略下面図である。図
中、１はリールギア、２はアイドラギア、３はクラッチ
ギア、４はプーリギアであり、これらのリール駆動系ギ
アは、早送りや巻戻しモード時においては非常に高速で
回転する必要があることから、圧力角が２０°で、歯先
のたけ，歯元のたけが並歯より大きい高歯を有する、噛
合率が２程度の歯車が使用されている。First, FIGS. 2 and 3 are a schematic top view and a schematic bottom view, respectively, showing a reel drive system of a VTR. In the figure, 1 is a reel gear, 2 is an idler gear, 3 is a clutch gear, 4 is a pulley gear, and these reel drive system gears need to rotate at a very high speed in the fast forward and rewind modes, A gear having an engagement angle of about 2 having a pressure angle of 20 ° and having high teeth with a tooth tip and a tooth tip having a larger tooth than the normal tooth is used.
【０００４】ここで、噛合率が２未満の歯車の場合、図
４に示すように、１対の歯車が噛合っている状態と２対
の歯車が噛合っている状態とが交互に繰り返されること
となり、噛合っている歯にかかる伝達荷重が変動するた
め、特に曲げ剛性の小さい樹脂製の歯車の場合、噛合っ
ている歯の変形量が変動して回転変動が生じる。そし
て、この歯の変形量の変動により、次ぎに噛合う歯も理
論上の噛合い位置より外れて、衝突する形で噛合うこと
となるため、歯の衝突によって生じる噛合騒音が大きく
なってしまう。Here, in the case of a gear whose meshing ratio is less than 2, as shown in FIG. 4, a state in which one pair of gears are in mesh and a state in which two pairs of gears are meshed are alternately repeated. This means that the transmission load applied to the meshed teeth fluctuates, and therefore, especially in the case of a resin gear having a small bending rigidity, the amount of deformation of the meshed teeth fluctuates, causing rotational fluctuation. Then, due to the variation of the deformation amount of the tooth, the next meshing tooth also deviates from the theoretical meshing position and meshes in a collision manner, so that the meshing noise generated by the collision of the teeth becomes large. .
【０００５】また、噛合率が２程度の歯車の場合は、図
５に示すように、常にピッチ円の外側の歯先部と内側の
歯元部との２ケ所の噛合点にて、２対の歯車が噛合って
いる状態となるので、噛合っている歯にかかる伝達荷重
は、２対の歯車に分散されることとなり、噛合率が２未
満のものに比べて小さくなり、１対の歯の変形量も小さ
くなる。よって、回転変動も小さくなり、噛合騒音も小
さくなる。Further, in the case of a gear having a meshing ratio of about 2, as shown in FIG. 5, two pairs are always provided at two meshing points of an outer tooth tip portion and an inner tooth root portion of a pitch circle. Since the gears are meshed, the transmission load applied to the meshed teeth is distributed to the two pairs of gears, which is smaller than that of gears having a meshing ratio of less than 2 The amount of tooth deformation is also small. Therefore, the rotation fluctuation is reduced and the meshing noise is also reduced.
【０００６】ところが、射出成型による樹脂製の歯車の
場合においては、歯先部における樹脂の収縮率が歯元部
における収縮率に比べて大きく、歯形形状を理論的なイ
ンボリュート歯形どおりに高精度に加工することが不可
能（特に、歯先部の形状が理論的なインボリュート歯形
より小さくなる）である。However, in the case of a resin-made gear by injection molding, the shrinkage ratio of the resin at the tooth tip is larger than that at the tooth root, and the tooth profile can be precisely shaped according to the theoretical involute tooth profile. It is impossible to machine (especially, the shape of the tooth tip is smaller than the theoretical involute tooth profile).
【０００７】そして、歯先部の形状が理論的なインボリ
ュート歯形より小さくなると、噛合率が２程度であって
も、図６に示すように、歯元に近い部分５で接触してい
ても、歯先に近い部分６で接触せず、実際には噛合いが
１歯のみで行われる（同時に２対の歯が噛合わない）状
態が生じてしまう。従って、噛合率が２未満の場合と同
様に回転変動が生じ、噛合が大きくなってしまう。If the shape of the tooth tip is smaller than the theoretical involute tooth profile, even if the meshing ratio is about 2 or, as shown in FIG. The portion 6 near the tooth tips does not come into contact with each other, and in reality, a state occurs in which only one tooth is engaged (two pairs of teeth are not engaged at the same time). Therefore, as in the case where the mesh ratio is less than 2, the rotation fluctuation occurs and the mesh becomes large.
【０００８】[0008]
【発明が解決しようとする課題】上述したとおり、従来
の歯車においては、噛合率が最大でも３には達せず、樹
脂製の歯車のように精度の悪い歯車の場合、歯車精度の
影響を受けて回転変動による噛合騒音が発生しやすいと
いう問題があった。As described above, in the conventional gear, the meshing ratio does not reach 3 even at the maximum, and in the case of a gear with poor accuracy such as a resin gear, the gear accuracy is affected. Therefore, there is a problem that meshing noise is likely to occur due to rotation fluctuation.
【０００９】また、同時に噛合う歯が３には達していな
いため、低騒音化に効果のある柔軟材料を使用した場
合、歯が弛んでしまう等強度面での問題が生じ、柔軟材
料を使用することが困難であるという問題があった。Further, since the number of teeth that mesh at the same time does not reach 3, when a soft material effective for noise reduction is used, problems such as loosening of teeth occur in strength, and the soft material is used. There was a problem that it was difficult to do.
【００１０】本発明は、このような点に鑑みてなされた
ものであり、歯車精度を均質化し低騒音化を可能とする
とともに、低騒音化に効果のある軟質材料を使用を可能
とした静音歯車を提供することを目的とする。The present invention has been made in view of the above points, and it is possible to homogenize the accuracy of gears to reduce noise and to use a soft material which is effective in reducing noise. The purpose is to provide gears.
【００１１】[0011]
【課題を解決するための手段】上述した課題を解決する
ため、本発明にかかる静音歯車は、射出成形による樹脂
製の静音歯車であって、圧力角を１４．５°程度とし、
歯先及び歯元のたけが並歯の１．６倍以上とすることに
より、噛合率を３以上としてなるものである。In order to solve the above-mentioned problems, a silent gear according to the present invention is a resin-made silent gear made by injection molding, and has a pressure angle of about 14.5 °.
By setting the tooth tips and roots to be 1.6 times or more that of the normal teeth, the meshing ratio is 3 or more.
【００１２】[0012]
【作用】本発明にかかる静音歯車では、常に３枚以上の
歯が噛合うこととなり、歯車精度を均質化し低騒音化を
図ることができるとともに、低騒音化に効果のある軟質
材質を使用することによって、さらに噛合騒音の低減を
図ることができる。In the silent gear according to the present invention, three or more teeth are always meshed with each other, the gear precision can be homogenized, noise can be reduced, and a soft material effective for noise reduction is used. As a result, the meshing noise can be further reduced.
【００１３】[0013]
【実施例】以下、本発明の静音歯車の一実施例を、上述
した従来例と同様ＶＴＲのリール駆動系ギアについて、
図１とともに説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a silent gear of the present invention will be described below with respect to a reel drive system gear of a VTR as in the conventional example described above.
A description will be given with reference to FIG.
【００１４】図１は、本実施例の静音歯車を示す要部拡
大説明図であり、歯数が３４、モジュールが０．５、歯
先のたけが０．８、歯元のたけが０．９の歯車１１と、
歯数が６６、モジュールが０．５、歯先のたけが０．
８、歯元のたけが０．９の歯車１２との噛合状態を表し
ている。ここで、歯車１１，１２の歯先及び歯元のたけ
は並歯に対して１．６倍以上となっている。FIG. 1 is an enlarged explanatory view of a main part of a silent gear according to the present embodiment. The number of teeth is 34, the module is 0.5, the tooth tip is 0.8, and the tooth tip is 0. 9 gears 11,
The number of teeth is 66, the module is 0.5, and the tooth tip is 0.
8 shows a meshing state with the gear 12 having a tooth bottom of 0.9. Here, the tooth tips and roots of the gears 11 and 12 are 1.6 times or more as large as the parallel teeth.
【００１５】歯車の噛合率εは、The gear engagement ratio ε is
【００１６】[0016]
【数１】 [Equation 1]
【００１７】により計算でき、本実施例の静音歯車にお
ける噛合率は３．１である。尚、式１において、ｒk は
歯先円の半径、ｒg は基礎円の半径、αは圧力角（＝１
４．５°）、ａは中心距離、ｔe は法線ピッチを表して
いる。The engagement ratio in the silent gear according to the present embodiment is 3.1. In Equation 1, r k is the radius of the addendum circle, r g is the radius of the basic circle, and α is the pressure angle (= 1
4.5 °), a represents the center distance, and t e represents the normal pitch.
【００１８】よって、本実施例の静音歯車の場合、同時
に噛合う接触部分が３ケ所若しくは４ケ所となり、歯車
１１が矢印方向に駆動されると、該歯車１１の歯先部１
１ａ，歯の中央部１１ｂ，歯元部１１ｃ付近で接触する
こととなる。従って、樹脂製の射出成形歯車のように精
度の悪い歯車で、例えば歯先部が小さく接触しなかった
としても、歯先部以外の他の２〜３ケ所で接触するた
め、実際の噛合いは常に２以上の歯によって行われるこ
ととなる。Therefore, in the case of the silent gear of this embodiment, there are three or four contact portions that are simultaneously engaged, and when the gear 11 is driven in the direction of the arrow, the addendum portion 1 of the gear 11 is
1a, the central portion 11b of the tooth, and the tooth root portion 11c are in contact with each other. Therefore, even with a gear having poor accuracy such as a resin-made injection-molded gear, for example, even if the tooth tips are small and do not come into contact with each other, they are contacted at two to three places other than the tooth tips, so that actual meshing is performed. Will always be done with two or more teeth.
【００１９】このように、本実施例の静音歯車において
は、常に３枚以上の歯車が同時に噛合っているので、樹
脂製の歯車のように精度の悪い歯車においても、歯車精
度が均質化されて影響を受けにくくなるため、回転変動
による噛合騒音の低減を図ることができる。また、１枚
の歯にかかる荷重が低減されるため、低騒音化に効果の
ある柔軟材質を使用することが可能となり、さらに噛合
騒音の低減を図ることができる。As described above, in the silent gear of this embodiment, since three or more gears are always in mesh at the same time, the gear precision is homogenized even in the case of a gear with poor precision such as a resin gear. Since it is less affected by this, it is possible to reduce meshing noise due to rotation fluctuation. Further, since the load applied to one tooth is reduced, it is possible to use a flexible material that is effective in reducing noise, and it is possible to further reduce meshing noise.
【００２０】[0020]
【発明の効果】本発明の静音歯車は、上述したような構
成であるので、常に３枚以上の歯車が同時に接触するこ
ととなり、樹脂製の歯車のように精度の悪い歯車の噛合
いにおいても、歯車精度が均質化されて影響を受けにく
くなるため、回転変動による噛合騒音の低減を図ること
ができる。Since the silent gear of the present invention is constructed as described above, three or more gears are always in contact at the same time, and even in the case of gears with poor precision such as resin gears. Since the gear accuracy is homogenized and is less likely to be affected, it is possible to reduce meshing noise due to rotational fluctuation.
【００２１】また、１枚の歯にかかる荷重が低減される
ため、低騒音化に効果のある柔軟材料を使用することが
可能となり、柔軟材質を使用した極めて低騒音の静音歯
車を実現することができる。Further, since the load applied to one tooth is reduced, it is possible to use a flexible material effective in reducing noise, and to realize an extremely low noise silent gear using the flexible material. You can
【図１】本発明の静音歯車の一実施例を示す要部拡大説
明図である。FIG. 1 is an enlarged explanatory view of a main part showing an embodiment of a silent gear of the present invention.
【図２】ＶＴＲのリール駆動系を示す概略上面図であ
る。FIG. 2 is a schematic top view showing a reel drive system of a VTR.
【図３】ＶＴＲのリール駆動系を示す概略下面図であ
る。FIG. 3 is a schematic bottom view showing a reel drive system of a VTR.
【図４】従来の噛合率２未満の歯車を示す要部概略説明
図である。FIG. 4 is a schematic explanatory view of a main part of a conventional gear having a meshing ratio of less than 2.
【図５】従来の噛合率２程度の歯車を示す要部拡大説明
図である。FIG. 5 is an enlarged explanatory view of a main part showing a conventional gear having a meshing ratio of about 2;
【図６】従来の噛合率２程度の歯車を示す要部概略説明
図である。FIG. 6 is a schematic explanatory view of a main part of a conventional gear having a meshing ratio of about 2;
１ リールギア ２ アイドラギア ３ クラッチギア ４ プーリギア ５ 歯元部分 ６ 歯先部分 １１ 歯車 １１ａ 歯先部 １１ｂ 歯の中央部 １１ｃ 歯元部 １２ 歯車 DESCRIPTION OF SYMBOLS 1 reel gear 2 idler gear 3 clutch gear 4 pulley gear 5 tooth root portion 6 tooth tip portion 11 gear 11a tooth tip 11b tooth central portion 11c tooth root 12 gear
Claims (2)
より、 噛合率を３以上としたことを特徴とする静音歯車。1. A silent gear characterized in that the engagement angle is set to 3 or more by setting the pressure angle to about 14.5 ° and setting the tooth tips and roots to be 1.6 times or more that of the normal teeth. .
ことを特徴とする請求項１記載の静音歯車。2. The silent gear according to claim 1, wherein the silent gear is made of resin by injection molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12099594A JPH07332467A (en) | 1994-06-02 | 1994-06-02 | Quiet sound gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12099594A JPH07332467A (en) | 1994-06-02 | 1994-06-02 | Quiet sound gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07332467A true JPH07332467A (en) | 1995-12-22 |
Family
ID=14800182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12099594A Pending JPH07332467A (en) | 1994-06-02 | 1994-06-02 | Quiet sound gear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07332467A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102165180A (en) * | 2008-09-29 | 2011-08-24 | 罗伯特·博世有限公司 | Reducing gear and starter device of an internal combustion engine |
| JP2013527892A (en) * | 2010-03-26 | 2013-07-04 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Tooth optimized for noise |
| CN103883705A (en) * | 2014-04-10 | 2014-06-25 | 王榕生 | Non-equivalent-modulus gear pair and scanning and numerical control machining template thereof |
| JP2018058208A (en) * | 2017-12-21 | 2018-04-12 | タイガースポリマー株式会社 | Spur gear or helical gear |
| JP2021052676A (en) * | 2019-09-30 | 2021-04-08 | グローブライド株式会社 | Fishing reel and drive gear thereof |
-
1994
- 1994-06-02 JP JP12099594A patent/JPH07332467A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102165180A (en) * | 2008-09-29 | 2011-08-24 | 罗伯特·博世有限公司 | Reducing gear and starter device of an internal combustion engine |
| JP2012504215A (en) * | 2008-09-29 | 2012-02-16 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Deceleration transmission and internal combustion engine starter |
| US9004034B2 (en) | 2008-09-29 | 2015-04-14 | Robert Bosch Gmbh | Reducing gear and starter device of an internal combustion engine |
| JP2013527892A (en) * | 2010-03-26 | 2013-07-04 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Tooth optimized for noise |
| CN103883705A (en) * | 2014-04-10 | 2014-06-25 | 王榕生 | Non-equivalent-modulus gear pair and scanning and numerical control machining template thereof |
| JP2018058208A (en) * | 2017-12-21 | 2018-04-12 | タイガースポリマー株式会社 | Spur gear or helical gear |
| JP2021052676A (en) * | 2019-09-30 | 2021-04-08 | グローブライド株式会社 | Fishing reel and drive gear thereof |
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