JP5347935B2 - Manufacturing method of resin gear - Google Patents

Manufacturing method of resin gear Download PDF

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JP5347935B2
JP5347935B2 JP2009279044A JP2009279044A JP5347935B2 JP 5347935 B2 JP5347935 B2 JP 5347935B2 JP 2009279044 A JP2009279044 A JP 2009279044A JP 2009279044 A JP2009279044 A JP 2009279044A JP 5347935 B2 JP5347935 B2 JP 5347935B2
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tooth
gear
tip
resin
resin gear
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JP2010216650A (en
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洋一 森尾
匡生 杉山
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Shin Kobe Electric Machinery Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a resin gear for improving gear accuracy. <P>SOLUTION: A tooth part 1 of this resin gear is separately formed by primary processing and secondary processing. First of all, the primary processing is performed by setting so that a tooth surface of a dedendum part 4 becomes a similar figure 6 to an involute curve of the final shape, and is performed by setting so that a tooth surface of an addendum part 3 becomes the inside more than the similar figure 6. The secondary processing is performed by setting so that a tooth surface over the whole coincides with the involute curve 8 of the final shape. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、樹脂製歯車の製造方法に関する。   The present invention relates to a method for manufacturing a resin gear.

年々厳しくなる排ガス規制に対応するため、自動車の燃費向上を目的として、自動車用部品に対する軽量化,コンパクト化の要求が強くなっており、エンジン内部やエンジン周辺部品の樹脂化が進められている。また、各自動車メーカは、ユーザからの要求であるエンジンの静粛性や室内の快適性,自動車の利便性も追求している。   In order to meet exhaust gas regulations that are becoming stricter year by year, there is an increasing demand for lighter and more compact automotive parts for the purpose of improving the fuel efficiency of automobiles. In addition, each automobile manufacturer pursues the quietness of the engine, the comfort of the room, and the convenience of the automobile, which are requests from users.

樹脂製歯車は、金属製歯車と噛み合う相手歯車として用いられ、軽量化に加え、歯の噛み合い時の騒音発生を抑えるために使用されているが、ギヤ駆動機構には、更なる静粛性向上が求められている。ギヤ駆動機構の静粛性向上には、歯車同士の噛み合い誤差を縮小するために、歯車精度の向上,組立精度の向上,歯面粗さと仕上げ方法が重要であることが知られている。   Resin gears are used as mating gears that mesh with metal gears and are used to reduce noise and reduce noise when teeth are engaged, but the gear drive mechanism has a further improvement in quietness. It has been demanded. In order to improve the quietness of the gear drive mechanism, it is known that improvement of gear accuracy, improvement of assembly accuracy, tooth surface roughness and finishing method are important in order to reduce meshing errors between gears.

金属製歯車において、歯車精度を向上させるには、ホブカッタによる歯切り加工後にシェービング加工,研磨加工,ホーニング加工などによる仕上げ加工をする方法が知られている。また、特許文献1には、歯のシェービング工程,歯の研磨工程で切削される切削代に相当する膨出部を有する歯形形状にあらかじめ鍛造工法,圧造工法,サイジング工法等で歯車を造形する技術が開示されている。   In order to improve gear accuracy in metal gears, a method is known in which finishing is performed by shaving, polishing, honing, etc. after gear cutting with a hob cutter. Patent Document 1 discloses a technique for forming a gear by a forging method, a forging method, a sizing method, or the like in advance into a tooth profile having a bulging portion corresponding to a cutting allowance cut in a tooth shaving process or a tooth polishing process. Is disclosed.

しかしながら、樹脂製歯車については、材料の剛性がないことから、上記仕上げ加工の適用は困難とされており、上記仕上げ加工を適用した技術については一切開示されていない。   However, since the resin gear does not have the rigidity of the material, it is difficult to apply the finishing process, and no technique to which the finishing process is applied is disclosed.

特開平8−105516号公報JP-A-8-105516

上述のとおり、ギヤ駆動機構の静粛性向上には、歯車精度の向上,組立精度の向上,歯面粗さと仕上げ方法が重要である。歯車精度の向上には、圧力角誤差,ねじれ角誤差などを縮小する必要があり、組立精度の向上には、各部品の寸法公差縮小が必要である。樹脂製歯車の場合、特に、オーバーボール寸法(Over Ball Diameter)公差の縮小があげられる。また、歯面粗さと仕上げ方法については、仕上げ方法を変更することで歯面粗さを向上させることができる。   As described above, improvement of gear accuracy, improvement of assembly accuracy, tooth surface roughness, and finishing method are important for improving the quietness of the gear drive mechanism. In order to improve gear accuracy, it is necessary to reduce pressure angle errors, torsion angle errors, etc., and in order to improve assembly accuracy, it is necessary to reduce the dimensional tolerance of each part. In the case of a resin gear, in particular, a reduction in over ball diameter tolerance can be given. Moreover, about a tooth surface roughness and a finishing method, a tooth surface roughness can be improved by changing a finishing method.

樹脂製歯車においても、歯車精度を向上させるために、金属製歯車と同様に、ホブカッタによる歯切り加工後にシェービング加工などによる仕上げ加工をする方法が考えられる。しかしながら、図2に示すように、ホブカッタ,シェービングカッタ共に最終形状と相似形状に歯形を形成する刃形仕様で加工した場合、歯車精度が逆に悪化することが判った。すなわち、図4に示すように、ホブカッタによる歯切り加工(一次加工)後の歯形線図から、樹脂製歯車の歯形形状は、設計歯形形状に近い形状に仕上がっているが、シェービング加工(二次加工)後は、樹脂製歯車の歯形形状に凹凸が発生し、ばらつき誤差が大きくなるという問題がある。この歯形線図は、測定値が中央の水平線上にあるときは、所定の設定どおりに加工されていることを示す。また、測定値が前記水平線より上にあるときは、所定の設定よりも外側に加工されていることを示し、測定値が前記水平線より下にあるときは、所定の設定よりも内側に加工されていることを示す。さらに、右端部で測定値が急激に下降しているのは、歯先に達したためである。
本発明が解決しようとする課題は、歯車精度を向上させた樹脂製歯車を製造することである。
Also in the case of resin gears, in order to improve gear accuracy, a method of finishing by shaving or the like after gear cutting by a hob cutter is conceivable as in the case of metal gears. However, as shown in FIG. 2, it has been found that when both the hob cutter and the shaving cutter are machined with a blade shape specification that forms a tooth shape similar to the final shape, the gear accuracy deteriorates conversely. That is, as shown in FIG. 4, from the tooth profile diagram after gear cutting (primary processing) by a hob cutter, the tooth profile of the resin gear is finished to a shape close to the design tooth profile, but shaving (secondary After processing, there is a problem that irregularities occur in the tooth profile of the resin gear, resulting in a large variation error. This tooth profile diagram indicates that the measured value is processed according to a predetermined setting when it is on the central horizontal line. When the measured value is above the horizontal line, it indicates that it is processed outside the predetermined setting. When the measured value is below the horizontal line, it is processed inside the predetermined setting. Indicates that Furthermore, the reason why the measured value sharply decreases at the right end is that the tooth tip has been reached.
The problem to be solved by the present invention is to produce a resin gear with improved gear accuracy.

本発明者らは、樹脂製歯車の仕上げ加工方法について鋭意検討を重ねた結果、樹脂製歯車の歯先部が仕上げ加工時に弾性変形して切削できていないことが原因であると推測し、本発明に到達した。   As a result of intensive studies on the finishing method for resin gears, the present inventors speculated that the cause is that the tooth tip portion of the resin gear is not elastically deformed and cut during finishing processing, The invention has been reached.

すなわち、本発明に係る樹脂製歯車の製造方法は、樹脂製歯車の歯部を、一次加工及び二次加工に分けて形成する樹脂製歯車の製造方法であって、前記一次加工は、歯元部の歯面が、最終形状のインボリュート曲線と相似形状になるよう設定して加工するとともに、歯先部の歯面が、前記相似形状よりも内側になるよう設定して加工する。そして、前記二次加工は、全体に亘る歯面が、最終形状のインボリュート曲線に一致するよう設定して加工することを特徴とする(請求項1)。   That is, the method for manufacturing a resin gear according to the present invention is a method for manufacturing a resin gear in which a tooth portion of a resin gear is formed by being divided into primary processing and secondary processing. The tooth surface of the part is set and processed so as to have a shape similar to the involute curve of the final shape, and the tooth surface of the tooth tip part is set and processed so as to be inside the similar shape. The secondary processing is performed by setting the entire tooth surface so as to match the final shape of the involute curve (claim 1).

好ましくは、前記一次加工における歯先部は、モジュール1.0以上2.5以下であれば、全歯丈の先端から15〜45%に相当する部分であり、モジュール2.5を超えて4.0以下であれば、全歯丈の先端から20〜60%に相当する部分であり、モジュール4.0を超えるのであれば、全歯丈の先端から25〜70%に相当する部分である(請求項2)。   Preferably, the tooth tip portion in the primary processing is a portion corresponding to 15 to 45% from the tip of the total tooth height when the module is 1.0 or more and 2.5 or less, and exceeds the module 2.5. If it is 0.0 or less, it is a portion corresponding to 20 to 60% from the tip of the total tooth height, and if it exceeds the module 4.0, it is a portion corresponding to 25 to 70% from the tip of the total tooth height. (Claim 2).

また、好ましくは、前記一次加工において、歯先部の歯先は、前記二次加工における歯元部の切削量の50〜100%に相当する距離だけ、前記最終形状のインボリュート曲線と相似形状よりも内側になるよう設定して加工する(請求項3)。さらに好ましくは、前記一次加工において、歯先部の歯面が、歯先に向かうに従って前記最終形状のインボリュート曲線と相似形状の歯面から内側への離間が大きくなるように加工する(請求項4)。   Preferably, in the primary processing, the tooth tip of the tooth tip portion is similar to the final shape involute curve by a distance corresponding to 50 to 100% of the cutting amount of the tooth root portion in the secondary processing. Is set so as to be on the inside (claim 3). More preferably, in the primary processing, the tooth surface of the tooth tip portion is processed so that the inward separation from the tooth surface having a shape similar to the involute curve of the final shape increases toward the tooth tip. ).

本発明に係る樹脂製歯車の製造方法では、一次加工にて、二次加工時に弾性変形して切削できない歯先部を予め切削しておくとともに、二次加工にて、ばらつき誤差の改善を実施することにより、歯車精度を向上させた樹脂製歯車を製造することができる。   In the method of manufacturing a resin gear according to the present invention, the tooth tip portion that cannot be cut due to elastic deformation during the secondary processing is cut in the primary processing in advance, and the variation error is improved in the secondary processing. Thus, a resin gear with improved gear accuracy can be manufactured.

本発明の実施の形態に係る樹脂製歯車の製造方法を説明する歯部拡大図である。It is a tooth part enlarged view explaining the manufacturing method of the resin gears concerning embodiment of this invention. 従来の樹脂製歯車の製造方法を説明する歯部拡大図である。It is a tooth part enlarged view explaining the manufacturing method of the conventional resin gear. 本発明の実施の形態に係る樹脂製歯車の歯形線図である。It is a tooth profile diagram of a resin gear according to an embodiment of the present invention. 従来の樹脂製歯車の歯形線図である。It is a tooth profile diagram of the conventional resin gear.

本発明の実施の形態を、図面を参照しながら説明する。
図1は、本発明の実施の形態に係る樹脂製歯車の製造方法を説明する歯部拡大図である。本発明に係る樹脂製歯車の製造方法は、樹脂製歯車の歯部1を、一次加工及び二次加工に分けて形成する。まず、一次加工は、歯元部4の歯面が、最終形状のインボリュート曲線と相似形状6になるよう設定して加工するとともに、歯先部3の歯面が、前記相似形状6よりも内側になるよう設定して加工する。そして、二次加工は、全体に亘る歯面が、最終形状のインボリュート曲線8に一致するよう設定して加工する。
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an enlarged view of a tooth portion for explaining a method of manufacturing a resin gear according to an embodiment of the present invention. In the method for manufacturing a resin gear according to the present invention, the tooth portion 1 of the resin gear is formed by being divided into primary processing and secondary processing. First, the primary processing is performed by setting the tooth surface of the tooth base portion 4 to have a similar shape 6 to the involute curve of the final shape, and the tooth surface of the tooth tip portion 3 is inward of the similar shape 6. Set to be processed. In the secondary processing, the entire tooth surface is set so as to match the involute curve 8 of the final shape.

好ましくは、一次加工における歯先部3は、モジュール1.0以上2.5以下であれば、全歯丈5の先端から15〜45%に相当する部分であり、モジュール2.5を超えて4.0以下であれば、全歯丈5の先端から20〜60%に相当する部分であり、モジュール4.0を超えるのであれば、全歯丈5の先端から25〜70%に相当する部分である。モジュールごとにこのような範囲であれば、良好な歯車精度を得ることができる。   Preferably, the tooth tip part 3 in the primary processing is a part corresponding to 15 to 45% from the tip of the total tooth height 5 if the module is 1.0 or more and 2.5 or less, and exceeds the module 2.5. If it is 4.0 or less, it is a portion corresponding to 20 to 60% from the tip of the total tooth height 5, and if it exceeds the module 4.0, it corresponds to 25 to 70% from the tip of the total tooth height 5. Part. Within such a range for each module, good gear accuracy can be obtained.

また、好ましくは、一次加工において、歯先部3の歯先は、二次加工における歯元部4の切削量の50〜100%に相当する距離だけ、最終形状のインボリュート曲線と相似形状7よりも内側になるよう設定して加工する。なお、二次加工における歯元部4の切削量とは、一次加工後の歯形7から、二次加工後の歯形8を形成するための、歯元部4における切削量をいう。この範囲であれば、良好な歯車精度を得ることができる。
さらに、一次加工において、歯先部3の歯面が、歯先2に向かうに従って最終形状のインボリュート曲線と相似形状6の歯面から内側への離間が大きくなるように加工することが好ましい。
Further, preferably, in the primary processing, the tooth tip of the tooth tip portion 3 is similar to the final shape involute curve 7 by a distance corresponding to 50 to 100% of the cutting amount of the tooth root portion 4 in the secondary processing. Set to be on the inside as well. In addition, the cutting amount of the tooth base part 4 in secondary processing means the cutting amount in the tooth base part 4 for forming the tooth profile 8 after secondary processing from the tooth profile 7 after primary processing. Within this range, good gear accuracy can be obtained.
Furthermore, in the primary processing, it is preferable that the tooth surface of the tooth tip portion 3 is processed so that the inward separation from the tooth surface of the similar shape 6 to the final shape involute curve increases toward the tooth tip 2.

本発明において、一次加工とは、例えば、ホブカッタによる歯切り加工、ピニオンカッタあるいはラックカッタによる歯切り加工等であり、二次加工とは、例えば、シェービング加工、研磨加工等である。   In the present invention, the primary processing is, for example, gear cutting by a hob cutter, gear cutting by a pinion cutter or a rack cutter, and the secondary processing is, for example, shaving processing, polishing processing, or the like.

一般的なシェービング加工は、シェービングカッタを所定の位置まで回転させながら高速で被削歯車に近づけた後、一定の速度で切り込む粗加工を行う。所定量を切り込んだ後、その位置でシェービングカッタを正転・逆転させ仕上げ加工を行い、弾性変形分を加工するためにシェービングカッタの切込みを戻し仕上げる。   In general shaving processing, rough processing is performed in which a shaving cutter is rotated to a predetermined position and brought close to the work gear at a high speed and then cut at a constant speed. After cutting a predetermined amount, the shaving cutter is rotated forward and reverse at that position and finished, and the shaving cutter is cut back to finish the elastic deformation.

樹脂製歯車においては、前記粗加工時の切込み速度を早くした場合、歯車1個内の各歯の歯形形状の傾向が異なり、歯車精度は悪化する。このため、歯車精度の向上には、粗加工時の切込み速度を遅くすることが好ましい。また、仕上げ加工時の回転方向を一方向にした(正転のみにした)場合、左右歯面の歯形形状が異なり、歯車精度は悪化する。このため、歯車精度の向上には、仕上げ加工時の回転方向は正逆均等にすることが好ましい。さらに、シェービング加工(二次加工)時の切削量を多くした場合、歯車精度は悪化する。このことから、歯車精度の向上には、シェービング加工(二次加工)時の切削量を少なくすることが好ましい。   In the resin gear, when the cutting speed at the time of roughing is increased, the tendency of the tooth profile shape of each tooth in one gear is different, and the gear accuracy is deteriorated. For this reason, in order to improve gear accuracy, it is preferable to slow the cutting speed during rough machining. In addition, when the rotational direction during finishing is set to one direction (only forward rotation), the tooth profile shapes of the left and right tooth surfaces are different, and the gear accuracy is deteriorated. For this reason, in order to improve gear accuracy, it is preferable that the rotational direction during finishing is equal to normal and reverse. Furthermore, when the amount of cutting at the time of shaving processing (secondary processing) is increased, the gear accuracy deteriorates. For this reason, in order to improve gear accuracy, it is preferable to reduce the amount of cutting during shaving (secondary machining).

実施例1
液状樹脂(熱硬化性樹脂)として、次のものを準備した。2,2’−(1,3フェニレン)ビス−2−オキサゾリン((A)成分)と4,4’−ジアミノジフェニルメタン((B)成分)をモル比2/1(質量比69/31)の配合割合で加熱混合溶解して液状物とする。これに、硬化促進剤としてn−オクチルブロマイドを配合する。硬化促進剤の配合量は、(A)(B)成分の総量100質量部に対して1.0質量部である。
Example 1
The following were prepared as a liquid resin (thermosetting resin). 2,2 ′-(1,3-phenylene) bis-2-oxazoline (component (A)) and 4,4′-diaminodiphenylmethane (component (B)) in a molar ratio of 2/1 (mass ratio 69/31) It is heated and mixed and dissolved at a mixing ratio to obtain a liquid. To this, n-octyl bromide is blended as a curing accelerator. The compounding quantity of a hardening accelerator is 1.0 mass part with respect to 100 mass parts of total amounts of (A) (B) component.

補強繊維基材として、次のものを準備した。メタ型アラミド繊維とパラ型アラミド繊維の混紡糸を丸編みして丸編み筒状体を構成する。この丸編み筒状体を端部から裏返して軸方向に巻き上げて、外径92mm,内径58mm,厚さ10mmのリング状補強繊維基材とする。   The following were prepared as the reinforcing fiber base. A circular knitted cylindrical body is formed by circularly knitting a mixed yarn of meta-type aramid fiber and para-type aramid fiber. This circular knitted tubular body is turned upside down from the end and rolled up in the axial direction to obtain a ring-shaped reinforcing fiber substrate having an outer diameter of 92 mm, an inner diameter of 58 mm, and a thickness of 10 mm.

2個積み重ねた上記リング状補強繊維基材と、その中央にインサートとして金属製ブッシュを配置し、200℃の成形金型に収容する。成形金型は、リング状補強繊維基材の厚さ方向に開閉動作するものであり、成形金型を閉じる動作によりリング状補強繊維基材を圧縮して、面方向に広がったリング状補強繊維基材を金属製ブッシュの周囲に圧接してその形状になじませる。そして、成形金型内を減圧状態とする。次に、閉じた成形金型に上記液状樹脂を注入し、リング状補強繊維基材に浸透させた液状樹脂を加熱硬化して金属製ブッシュをインサートとする繊維強化樹脂成形体を成形する。   Two ring-shaped reinforcing fiber bases stacked one above the other and a metal bush as an insert at the center thereof are accommodated in a 200 ° C. molding die. The molding die opens and closes in the thickness direction of the ring-shaped reinforcing fiber base material, and the ring-shaped reinforcing fiber spreads in the surface direction by compressing the ring-shaped reinforcing fiber base material by closing the molding die. The substrate is pressed around the metal bush to conform to its shape. Then, the inside of the molding die is brought into a reduced pressure state. Next, the liquid resin is poured into a closed molding die, and the liquid resin infiltrated into the ring-shaped reinforcing fiber base is heated and cured to form a fiber reinforced resin molded body using a metal bush as an insert.

前記繊維強化樹脂成形体を、最終形状が表1に示す寸法となるように切削加工を行った。図1に示すように、まず、ホブカッタによる歯切り加工(一次加工)にて、最終形状のインボリュート曲線と相似形状6に歯元部4を切削する。このとき、歯先部3は、この相似形状6よりも切削量を多くしておく。そして、シェービング加工(二次加工)にて、最終形状のインボリュート曲線8とする。   The fiber-reinforced resin molded body was cut so that the final shape had the dimensions shown in Table 1. As shown in FIG. 1, first, the tooth base 4 is cut into a shape 6 similar to the involute curve of the final shape by gear cutting (primary processing) using a hob cutter. At this time, the tooth tip portion 3 has a larger cutting amount than the similar shape 6. Then, the final shape of the involute curve 8 is obtained by shaving (secondary processing).

このときの一次加工における歯先部3は、モジュール3.0であるので、全歯丈5の先端から45%に相当する部分(以下(a)とする)とした。また、一次加工において、歯先部3の歯先は、二次加工における歯元部4の切削量の90%に相当する距離だけ、最終形状のインボリュート曲線と相似形状7よりも内側(以下(b)とする)になるよう設定して加工した。さらに、一次加工において、歯先部3の歯面が、歯先2に向かうに従って最終形状のインボリュート曲線と相似形状6の歯面から内側への離間が大きくなるように形成した。   Since the tooth tip part 3 in the primary processing at this time is the module 3.0, it is a part corresponding to 45% from the tip of the total tooth height 5 (hereinafter referred to as (a)). Further, in the primary processing, the tooth tip of the tooth tip portion 3 is inside the final shape involute curve and the similar shape 7 by a distance corresponding to 90% of the cutting amount of the tooth base portion 4 in the secondary processing (hereinafter referred to as ( It was set to be b)) and processed. Further, in the primary processing, the tooth surface of the tooth tip portion 3 was formed such that the inward separation from the tooth surface of the similar shape 6 to the involute curve of the final shape increased toward the tooth tip 2.

実施例2〜7
実施例1において、(a)及び(b)を、各例毎にそれぞれ表4〜5に示すとおりとする以外は実施例1と同様にして、樹脂製歯車を得た。
Examples 2-7
In Example 1, resin gears were obtained in the same manner as in Example 1 except that (a) and (b) were as shown in Tables 4 to 5 for each example.

従来例1
実施例1において、図2に示すように、ホブカッタによる歯切り加工にて、歯先部3を含めた歯部全体を、最終形状のインボリュート曲線と相似形状6に切削する以外は実施例1と同様にして、樹脂製歯車を得た。
Conventional Example 1
In Example 1, as shown in FIG. 2, the entire tooth part including the tooth tip part 3 is cut into a shape 6 similar to the final shape involute curve by gear cutting with a hob cutter. Similarly, a resin gear was obtained.

実施例8〜12
実施例1において、最終形状を表2に示す寸法(モジュール:1.0)とし、(a)及び(b)を、各例毎にそれぞれ表6に示すとおりとする以外は実施例1と同様にして、樹脂製歯車を得た。
Examples 8-12
Example 1 is the same as Example 1 except that the final shape is the dimension (module: 1.0) shown in Table 2, and (a) and (b) are as shown in Table 6 for each example. Thus, a resin gear was obtained.

実施例13〜17
実施例1において、最終形状を表3に示す寸法(モジュール:5.0)とし、(a)及び(b)を、各例毎にそれぞれ表7に示すとおりとする以外は実施例1と同様にして、樹脂製歯車を得た。
Examples 13-17
Example 1 is the same as Example 1 except that the final shape is the dimension (module: 5.0) shown in Table 3 and (a) and (b) are shown in Table 7 for each example. Thus, a resin gear was obtained.

上記実施例、従来例で作製した樹脂製歯車を用いて、歯形線図及び歯形誤差を測定した結果を図3(実施例1)、図4(従来例1)及び表4〜7に示す。測定方法は、旧JIS−B−1752(平歯車及びはすば歯車測定方法)に準じて測定した。   FIG. 3 (Example 1), FIG. 4 (Conventional example 1) and Tables 4 to 7 show the results of measuring the tooth profile diagram and the tooth profile error using the resin gears produced in the above examples and conventional examples. The measuring method was measured according to the former JIS-B-1752 (spur gear and helical gear measuring method).

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Figure 0005347935

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Figure 0005347935

図3〜4に示すように、本発明に係る樹脂製歯車の製造方法は、一次加工にて、歯元部の歯面は、最終形状のインボリュート曲線と相似形状の歯面とするとともに、歯先部の歯面は、この相似形状の歯面よりも内側に位置させ、二次加工にて、最終形状のインボリュート曲線の歯面とすることにより、二次加工後の樹脂製歯車の歯形形状は、設計歯形形状に近い形状に仕上がっている。また、表4〜7に示すように、歯形誤差が小さく良好であり、歯車精度を向上させた樹脂製歯車を製造することができる。   As shown in FIGS. 3 to 4, the method for manufacturing a resin gear according to the present invention is such that the tooth surface of the tooth root portion is a tooth surface having a shape similar to the involute curve of the final shape in the primary processing. The tooth surface of the tip part is positioned inside the tooth surface of the similar shape, and the tooth surface of the resin gear after the secondary processing is obtained by making the tooth surface of the involute curve of the final shape by secondary processing. Has a shape close to the design tooth profile. Further, as shown in Tables 4 to 7, a resin gear having a small tooth profile error and good and improved gear accuracy can be manufactured.

また、モジュール2.5を超えて4.0以下の場合には、一次加工における歯先部を、全歯丈の先端から20〜60%に相当する部分とすることにより、歯形誤差が小さく、歯車精度を向上させた樹脂製歯車を製造できることが理解できる(実施例1、3、4と実施例2、5の対比)。モジュール1.0以上2.5以下の場合には、一次加工における歯先部を、全歯丈の先端から15〜45%に相当する部分とすることにより、歯形誤差が小さく、歯車精度を向上させた樹脂製歯車を製造できることが理解できる(実施例9〜11と実施例8、12の対比)。モジュール4.0を超える場合には、一次加工における歯先部を、全歯丈の先端から25〜70%に相当する部分とすることにより、歯形誤差が小さく、歯車精度を向上させた樹脂製歯車を製造できることが理解できる(実施例14〜16と実施例13、17の対比)。   In addition, when the module 2.5 is 4.0 or less and the tooth tip portion in the primary processing is a portion corresponding to 20 to 60% from the tip of the total tooth height, the tooth profile error is small, It can be understood that a resin gear with improved gear accuracy can be produced (contrast of Examples 1, 3, 4 and Examples 2, 5). When the module is 1.0 or more and 2.5 or less, the tooth tip portion in the primary processing is a portion corresponding to 15 to 45% from the tip of the total tooth height, thereby reducing the tooth profile error and improving the gear accuracy. It can be understood that the resin gear made can be manufactured (contrast of Examples 9 to 11 and Examples 8 and 12). When the module exceeds 4.0, the tooth tip part in the primary processing is a part corresponding to 25 to 70% from the tip of the total tooth height, so that the tooth profile error is small and the gear accuracy is improved. It can be understood that a gear can be manufactured (contrast of Examples 14 to 16 and Examples 13 and 17).

さらに、一次加工において、歯先部の歯先を、二次加工における歯元部の切削量の50〜100%に相当する距離だけ、最終形状のインボリュート曲線と相似形状よりも内側になるよう設定して加工することにより、歯形誤差が小さく、歯車精度を向上させた樹脂製歯車を製造できることが理解できる(実施例1、7と実施例6の対比)。   Furthermore, in the primary processing, the tooth tip of the tooth tip portion is set to be inward of the final shape involute curve and the similar shape by a distance corresponding to 50 to 100% of the cutting amount of the tooth root portion in the secondary processing. Thus, it can be understood that a resin gear having a small tooth profile error and improved gear accuracy can be manufactured (a comparison between Examples 1 and 7 and Example 6).

1は歯部
2は歯先
3は歯先部
4は歯元部
5は全歯丈
6は最終形状のインボリュート曲線と相似形状
7、7’は一次加工後の歯形
8、8’は二次加工後の歯形(最終形状のインボリュート曲線)
1 is a tooth part 2 is a tooth tip 3 is a tooth tip part 4 is a tooth root part 5 is a total tooth height 6 is a shape 7 similar to the final shape involute curve, 7 'is a tooth profile 8 and 8' after a primary processing Tooth profile after processing (final shape involute curve)

Claims (4)

樹脂製歯車の歯部を、一次加工及び二次加工に分けて形成する樹脂製歯車の製造方法であって、
前記一次加工は、歯元部の歯面が、最終形状のインボリュート曲線と相似形状になるよう設定して加工するとともに、歯先部の歯面が、前記相似形状よりも内側になるよう設定して加工し、
前記二次加工は、全体に亘る歯面が、最終形状のインボリュート曲線に一致するよう設定して加工することを特徴とする樹脂製歯車の製造方法。
A resin gear manufacturing method for forming a tooth portion of a resin gear by dividing it into primary processing and secondary processing,
The primary processing is performed by setting the tooth surface of the tooth root portion to be similar to the final shape of the involute curve, and setting the tooth surface of the tooth tip portion to be inside the similar shape. Processed
The method of manufacturing a resin gear, wherein the secondary processing is performed by setting the entire tooth surface to match an involute curve of a final shape.
前記一次加工における歯先部は、モジュール1.0以上2.5以下であれば、全歯丈の先端から15〜45%に相当する部分であり、モジュール2.5を超えて4.0以下であれば、全歯丈の先端から20〜60%に相当する部分であり、モジュール4.0を超えるのであれば、全歯丈の先端から25〜70%に相当する部分である、請求項1記載の樹脂製歯車の製造方法。   The tooth tip part in the primary processing is a part corresponding to 15 to 45% from the tip of the total tooth height if the module is 1.0 or more and 2.5 or less, and exceeds the module 2.5 and 4.0 or less. If so, it is a portion corresponding to 20 to 60% from the tip of the total tooth height, and if it exceeds module 4.0, it is a portion corresponding to 25 to 70% from the tip of the total tooth height. A method for producing a resin gear according to 1. 前記一次加工において、歯先部の歯先は、前記二次加工における歯元部の切削量の50〜100%に相当する距離だけ、前記最終形状のインボリュート曲線と相似形状よりも内側になるよう設定して加工することを特徴とする請求項1又は2記載の樹脂製歯車の製造方法。   In the primary processing, the tooth tip of the tooth tip portion is located inside the shape similar to the involute curve of the final shape by a distance corresponding to 50 to 100% of the cutting amount of the tooth root portion in the secondary processing. It sets and processes, The manufacturing method of the resin gear of Claim 1 or 2 characterized by the above-mentioned. 前記一次加工において、歯先部の歯面が、歯先に向かうに従って前記最終形状のインボリュート曲線と相似形状の歯面から内側への離間が大きくなるように加工することを特徴とする請求項1乃至3の何れかに記載の樹脂製歯車の製造方法。   In the primary processing, the tooth surface of the tooth tip part is processed so that the inward separation from the tooth surface having a shape similar to the involute curve of the final shape increases toward the tooth tip. The manufacturing method of the resin gears in any one of thru | or 3.
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