JP4697887B2 - A pair of plastic helical gears - Google Patents

A pair of plastic helical gears Download PDF

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JP4697887B2
JP4697887B2 JP2006284934A JP2006284934A JP4697887B2 JP 4697887 B2 JP4697887 B2 JP 4697887B2 JP 2006284934 A JP2006284934 A JP 2006284934A JP 2006284934 A JP2006284934 A JP 2006284934A JP 4697887 B2 JP4697887 B2 JP 4697887B2
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width direction
center
resin
tooth width
teeth
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JP2008101700A (en
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徹 萩原
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Enplas Corp
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Enplas Corp
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Description

本発明は、動力伝達用のギヤトレインの一部を構成する一対の樹脂製やまば歯車に関するものである。   The present invention relates to a pair of resin blind gears constituting a part of a gear train for power transmission.

従来から、動力伝達用のギヤトレインの一部には、動力伝達時における作動音を静粛化すると共に振動を抑えるために、一対の噛み合う樹脂製やまば歯車が使用されている（特許文献１参照）。
特開２００５−６９４５８号公報 Conventionally, a part of a gear train for power transmission has been used with a pair of meshing splint gears in order to reduce operating noise and suppress vibration during power transmission (see Patent Document 1). ).
JP 2005-69458 A

しかしながら、一対の噛み合う樹脂製やまば歯車は、山形形状の歯の全歯幅方向中央に位置する頂部の歯元において、頂部近傍を除く歯の歯元応力よりも大きな応力が作用するため、この応力差に起因して最初に寿命に達する。そのため、機構設計を担当する技術者から、樹脂製やまば歯車の全歯幅方向中央に位置する頂部の歯元応力値を低減でき、樹脂製やまば歯車の歯の強度を増すことができる技術の提供が望まれていた。   However, since a pair of meshing tooth-gear gears that are meshed with each other, a stress larger than the tooth root stress of the teeth excluding the vicinity of the top portion acts on the root portion of the top portion located in the center of the entire tooth width direction of the chevron shaped teeth. The lifetime is first reached due to the stress difference. Therefore, from the engineer in charge of mechanism design, the technology that can reduce the tooth root stress value of the top located in the center of the entire tooth width direction of the resin-made helical gear, and can increase the strength of the tooth of the plastic-made blind gear The offer of was desired.

そこで、本発明は、樹脂製やまば歯車の歯の強度を効果的に高め、噛み合う一対の樹脂製やまば歯車の寿命を長くすることを目的とする。   Therefore, an object of the present invention is to effectively increase the strength of the teeth of a resin-made spur gear and to prolong the life of a pair of resin-made spur gears that mesh with each other.

請求項１の発明は、ねじれが反対のはすば歯車を歯幅方向中央で貼り合わせたような山形形状の歯を多数有する一方の樹脂製やまば歯車と、この一方の樹脂製やまば歯車の前記歯と噛み合う多数の歯を有する他方の樹脂製やまば歯車と、からなる一対の樹脂製やまば歯車に関するものである。この発明において、前記一方の樹脂製やまば歯車の歯は、少なくとも歯幅方向中央近傍の圧力角が、歯幅方向中央近傍以外の圧力角よりも大きくなるように形成されている。また、前記他方の樹脂製やまば歯車の歯は、前記一方の樹脂製やまば歯車の前記歯と同一の圧力角の変化となるように形成されている。   According to the first aspect of the present invention, there is provided one resin-made helical gear having a plurality of angle-shaped teeth obtained by bonding helical gears having opposite torsion at the center in the tooth width direction, and this one resin-made helical gear. The present invention relates to a pair of resin-made spur gears comprising the other resin-made spur gear having a large number of teeth meshing with the teeth. In the present invention, the teeth of the one resin-made spur gear are formed so that at least the pressure angle near the center in the tooth width direction is larger than the pressure angle other than near the center in the tooth width direction. Further, the teeth of the other resin blind gear are formed to have the same pressure angle change as the teeth of the one resin blind gear.

請求項２の発明は、請求項１の発明に係る一対の樹脂製やまば歯車において、以下のような特徴を有するものである。すなわち、 前記一方の樹脂製やまば歯車の前記歯の歯幅方向中央近傍における圧力角は、歯幅方向中央から歯幅方向端部側へ向かうにしたがって漸減するようになっている。また、前記一方の樹脂製やまば歯車の前記歯の歯幅方向中央近傍以外における圧力角は、前記歯幅方向中央近傍の圧力角の変化に連続して変化するようになっている。   A second aspect of the present invention is the pair of resin blind gears according to the first aspect of the present invention, and has the following characteristics. That is, the pressure angle in the vicinity of the tooth width direction center of the tooth of the one resin-made spur gear gradually decreases from the tooth width direction center toward the end in the tooth width direction. Further, the pressure angle of the one resin-made helical gear other than the vicinity of the center of the tooth width direction of the tooth continuously changes with the change of the pressure angle near the center of the tooth width direction.

請求項３の発明は、請求項１の発明に係る一対の樹脂製やまば歯車において、以下のような特徴を有するものである。すなわち、前記一方の樹脂製やまば歯車の前記歯は、前記歯幅方向中央近傍の圧力角が一定であって、前記歯幅方向中央近傍以外の圧力角が前記歯幅方向中央近傍から離れるにしたがって漸減するようになっている。   A third aspect of the present invention is the pair of resin blind gears according to the first aspect of the present invention, and has the following characteristics. In other words, the tooth of the one resin-made spur gear has a constant pressure angle near the center in the tooth width direction, and a pressure angle other than near the center in the tooth width direction is away from the vicinity in the center in the tooth width direction. Therefore, it gradually decreases.

請求項４の発明は、請求項１の発明に係る一対の樹脂製やまば歯車において、以下のような特徴を有するものである。すなわち、前記一方の樹脂製やまば歯車の前記歯は、前記歯幅方向中央近傍の圧力角が一定であって、前記歯幅方向中央近傍以外の圧力角が前記歯幅方向中央近傍の圧力角よりも小さく且つ一定である。   According to a fourth aspect of the present invention, the pair of resin blind gears according to the first aspect of the present invention has the following characteristics. That is, the teeth of the one resin-made spur gear have a constant pressure angle near the center in the tooth width direction, and pressure angles other than the vicinity in the center in the tooth width direction are pressure angles near the center in the tooth width direction. Smaller and constant.

本発明によれば、噛み合う一対の樹脂製やまば歯車の歯の強度を、少なくとも応力集中が生じやすい全歯幅の中央近傍において効率的に大きくすることができる。その結果、本発明は、一対の樹脂製やまば歯車の長寿命化を図ることができる。   According to the present invention, it is possible to efficiently increase the strength of the teeth of a pair of meshed helical gears at least in the vicinity of the center of the entire tooth width at which stress concentration is likely to occur. As a result, the present invention can prolong the life of a pair of resin-made helical gears.

以下、本発明の最良の実施形態を図面に基づき詳述する。   Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings.

図１は、噛み合う一対の樹脂製やまば歯車１を示すものである。この図１に示す一対の樹脂製やまば歯車１は、共に同一の樹脂材料（ポリアセタール（ＰＯＭ），ポリアミド，ポリカーボネート，ＡＢＳ樹脂等）を使用して射出成形されたものであり、小径で歯数の少ない第１やまば歯車（一方の樹脂製やまば歯車）２と、この第１やまば歯車２よりも大径で歯数の多い第２やまば歯車（他方の樹脂製やまば歯車）３とで構成されている。これら第１やまば歯車２及び第２やまば歯車３の歯４，５は、歯のねじれ方向が反対のはすば歯車を貼り合わせたような山形形状（図２の平面形状が略Ｖ字形状）をしている。なお、この一対の樹脂製やまば歯車１は、第１やまば歯車２の歯数をＺ１とし、第２やまば歯車３の歯数をＺ２とすると、第１やまば歯車２から第２やまば歯車３へと動力が伝達される際の減速比がＺ２／Ｚ１となり、増速比がＺ１／Ｚ２となる。   FIG. 1 shows a pair of intermeshing gears 1 made of resin. A pair of resin spur gears 1 shown in FIG. 1 is injection-molded using the same resin material (polyacetal (POM), polyamide, polycarbonate, ABS resin, etc.), and has a small diameter and the number of teeth. First helical gear (one resin-made helical gear) 2 and a second helical gear (the other plastic-made helical gear) 3 having a larger diameter and a larger number of teeth than the first helical gear 2. It consists of and. The teeth 4 and 5 of the first helical gear 2 and the second helical gear 3 have a chevron shape in which helical gears whose teeth twist directions are opposite to each other (the planar shape in FIG. 2 is substantially V-shaped). Shape). The pair of resin-made spur gears 1 is configured such that the number of teeth of the first spur gear 2 is Z1, and the number of teeth of the second spur gear 3 is Z2. For example, the speed reduction ratio when power is transmitted to the gear 3 is Z2 / Z1, and the speed increase ratio is Z1 / Z2.

図１に示す第１やまば歯車２は、ウェブ６の中央部に軸穴７が形成され、ウェブ６の外周側に複数の歯４が形成されている。そして、この第１やまば歯車２の歯４は、図２に示すように、全歯幅の中央（歯幅方向中央）Ｗｃの近傍Ｌ（例えば、全歯幅をＷとすると、Ｌ＝Ｗ／５又は１ｍｍのいずれか大きな寸法の範囲）において、全歯幅の中央Ｗｃに向かうにしたがって圧力角が漸増するように形成されている。ここで、歯４の歯幅方向中央近傍（歯幅方向中央を中心とする歯幅方向の所定範囲）Ｌの圧力角を歯幅方向中央に向かうにしたがって漸増させ、歯４の歯幅方向中央における歯元側の歯厚を厚くした理由は、歯のねじれ角が１５°の樹脂製やまば歯車の場合、歯の歯幅方向中央における歯元応力が歯の歯幅方向中央以外の歯元応力よりも２０％程度大きいことに着目し、歯幅方向中央部近傍の歯元を補強すれば、歯全体の強度を効率的に増大できる点、及び噛み合い率の低下を極力抑える必要がある点を考慮したものである。なお、歯幅方向中央近傍Ｌの寸法をＷ／５（Ｌ＝Ｗ／５）としたのは、歯幅方向中央の歯元応力を２０％程度減少させるにはＷ／５程度の範囲を補強する範囲として考慮すれば十分であると考えられ、また、全歯幅Ｗの１／５の範囲の圧力角の変化であれば噛み合い率に大きな変化を生じさせることがないと判断されたことによる。また、圧力角が変化する範囲である歯幅方向中央近傍ＬをＷ／５と１ｍｍのいずれか大きな方としたのは、Ｗ／５が１ｍｍよりも小さい場合、歯形形状を高精度に成形するのが困難となる点を考慮したものである。すなわち、歯幅方向中央近傍Ｌは、Ｗ／５＞１ｍｍの場合にはＷ／５とし、Ｗ／５＜１ｍｍの場合には１ｍｍとする。   In the first helical gear 2 shown in FIG. 1, a shaft hole 7 is formed at the center of the web 6, and a plurality of teeth 4 are formed on the outer peripheral side of the web 6. Then, as shown in FIG. 2, the teeth 4 of the first spur gear 2 are in the vicinity of the center of the total tooth width (center in the tooth width direction) Wc (for example, if the total tooth width is W, L = W In the range of the larger dimension of / 5 or 1 mm), the pressure angle gradually increases toward the center Wc of the entire tooth width. Here, the pressure angle of the tooth 4 in the vicinity of the center of the tooth width direction (a predetermined range in the tooth width direction centering on the center of the tooth width direction) L is gradually increased toward the center of the tooth width direction, The reason for increasing the tooth thickness on the tooth base side is that in the case of a resin-made helical gear having a tooth twist angle of 15 °, the tooth root stress at the center of the tooth width direction is the tooth root other than the center of the tooth width direction. Focusing on the fact that the tooth root in the vicinity of the center in the tooth width direction is reinforced by focusing on the fact that it is about 20% larger than the stress, the strength of the whole tooth can be increased efficiently, and the reduction in the engagement rate must be suppressed as much as possible. Is taken into account. The dimension L in the vicinity of the center in the tooth width direction is set to W / 5 (L = W / 5) because the range of about W / 5 is reinforced in order to reduce the tooth root stress in the center in the tooth width direction by about 20%. This is considered to be sufficient if it is considered as a range to be applied, and if it is determined that a change in pressure angle in the range of 1/5 of the total tooth width W will not cause a large change in the meshing rate. . Further, the central width L in the tooth width direction, which is the range in which the pressure angle changes, is set to the larger one of W / 5 and 1 mm. When W / 5 is smaller than 1 mm, the tooth profile shape is formed with high accuracy. This is in consideration of the point that it becomes difficult to do so. In other words, the center vicinity L in the tooth width direction is W / 5 when W / 5> 1 mm, and 1 mm when W / 5 <1 mm.

このように形成された第１やまば歯車２は、図２（ｃ）に示すように、歯４の全歯幅の中央Ｗｃ近傍において、全歯幅の中央Ｗｃに向かうにしたがって歯元側の歯厚寸法が大きくなり、応力集中を生じやすい歯４の頂部８近傍の強度を効率的に高くすることができる。   As shown in FIG. 2 (c), the first helical gear 2 formed in this way is near the center Wc of the total tooth width of the tooth 4 and is closer to the center Wc of the total tooth width. The tooth thickness dimension is increased, and the strength in the vicinity of the top 8 of the tooth 4 where stress concentration is likely to occur can be efficiently increased.

ここで、図４に示すように、歯幅方向中央近傍以外の歯４の圧力角が１４．５°の場合、歯幅方向中央の圧力角を２０．８°にすると、歯の強度を２０％高くする（歯元応力を２０％低減する）ことができる。なお、図４は、歯４の強度を１％高めるには、圧力角を１．０４°大きくする必要があることを示している。すなわち、図４に示す直線Ｔ１は、圧力角をαとし、強度アップ率をβとすると、α＝１４．５°＋１．０４βの関係を示している。   Here, as shown in FIG. 4, when the pressure angle of the teeth 4 other than the vicinity of the center in the tooth width direction is 14.5 °, when the pressure angle at the center in the tooth width direction is 20.8 °, the tooth strength is 20 % (The root stress can be reduced by 20%). FIG. 4 shows that the pressure angle needs to be increased by 1.04 ° to increase the strength of the tooth 4 by 1%. That is, the straight line T1 shown in FIG. 4 shows a relationship of α = 14.5 ° + 1.04β, where α is the pressure angle and β is the strength increase rate.

以上のような第１やまば歯車２は、例えば、モータの出力軸に固定されるピニオンギヤとして使用され、減速装置の一部を構成するか、又は、被動側ギヤとして使用され、増速装置の一部を構成する。   The first blind gear 2 as described above is used as, for example, a pinion gear fixed to the output shaft of the motor, and constitutes a part of the speed reducer or is used as a driven side gear. Part of it.

図１に示す第２やまば歯車３は、中心部に軸穴１０が形成されたボス部１１と、このボス部１１の外周側で且つ幅方向中央部（軸芯ＣＬ２に沿った方向の中央部）から径方向外方へ向かって広がる円板状のウェブ１２と、このウェブ１２の外周に形成された円筒状のリム１３とを備え、このリム１３の外周側に第１やまば歯車２の歯４と噛み合う複数の歯５が形成されている。   A second helical gear 3 shown in FIG. 1 includes a boss part 11 having a shaft hole 10 formed in the center part, and a center part in the width direction (the center in the direction along the axis CL2) on the outer peripheral side of the boss part 11. Part) and a cylindrical rim 13 formed on the outer periphery of the web 12, and a first helical gear 2 on the outer peripheral side of the rim 13. A plurality of teeth 5 meshing with the teeth 4 are formed.

そして、この第２やまば歯車３の歯５は、図３に示すように、全歯幅の中央Ｗｃ近傍において、第１やまば歯車２の歯４と同様の形状となるように形成されている。すなわち、第２やまば歯車３の歯５は、第１やまば歯車２の歯４と同一の歯幅方向範囲（歯幅方向中央近傍Ｌ）内において、第１やまば歯車２の歯４の圧力角の変化と同一の圧力角の変化となるように形成されている。また、この第２やまば歯車３の歯５は、第１のやまば歯車２の歯４との噛み合い箇所における圧力角が第１やまば歯車２の歯４の圧力角と同一になるように形成されている。   As shown in FIG. 3, the teeth 5 of the second spur gear 3 are formed to have the same shape as the teeth 4 of the first spur gear 2 in the vicinity of the center Wc of the entire tooth width. Yes. That is, the teeth 5 of the second helical gear 3 are within the same tooth width direction range (near the center L in the tooth width direction) as the teeth 4 of the first helical gear 2. The pressure angle change is the same as the pressure angle change. Further, the teeth 5 of the second blind gear 3 have a pressure angle at the meshing position with the teeth 4 of the first blind gear 2 equal to the pressure angle of the teeth 4 of the first blind gear 2. Is formed.

このように形成された第２やまば歯車３は、第１やまば歯車２と同様に、応力集中が生じやすい歯５の頂部１４近傍の強度を効率的に高くすることができ、歯５の歯幅方向中央の歯元応力を低減することができる。   The second helical gear 3 formed in this manner can efficiently increase the strength in the vicinity of the top 14 of the tooth 5 where stress concentration is likely to occur, similarly to the first helical gear 2. The root stress in the center in the tooth width direction can be reduced.

なお、このような形状の第２やまば歯車３は、第１やまば歯車２と対で使用され、減速装置又は増速装置の一部を構成する。   The second helical gear 3 having such a shape is used as a pair with the first helical gear 2 and constitutes a part of the speed reducer or the speed increasing device.

以上のように、本実施形態によれば、第１やまば歯車２の歯４の強度を高くすることができると共に、第２やまば歯車３の歯５の強度をも高くすることができ、一対の樹脂製やまば歯車１としての寿命を長くすることができる。   As described above, according to the present embodiment, the strength of the teeth 4 of the first helical gear 2 can be increased, and the strength of the teeth 5 of the second helical gear 3 can also be increased. The lifetime as a pair of resin-made blind gears 1 can be extended.

（変形例）
本発明は、上記実施形態に限定されるものではなく、図５に示すように、歯４，５の歯幅方向中央近傍Ｌの圧力角が他部（歯幅方向中央近傍Ｌ以外の部分）の圧力角よりも大きくなっていればよく、歯４，５の圧力角の変化のさせ方としても様々なものが考えられる。例えば、図５のＡパターンのように、歯４，５の歯幅方向中央近傍Ｌを一定の圧力角とし、歯４，５の歯幅方向中央近傍以外の部分の圧力角を歯幅方向中央近傍Ｌから歯幅方向端部に向かうにしたがって漸減させるようにしてもよい。また、図５のＢパターンのように、歯４，５の歯幅方向中央（Ｗｃ）から幅方向両端部側へ向かうにしたがって圧力角を漸減させるようにしてもよい。また、図５のＣパターンのように、歯４，５の歯幅方向中央近傍以外の部分を一定の基準圧力角とし、歯の歯幅方向中央近傍Ｌのみを基準圧力角よりも大きく且つ一定の圧力角にするように構成してもよい。なお、図５中において、ａ及びｂは、歯４，５の歯幅方向一端及び歯幅方向他端とするか、又は、歯４，５の歯幅方向一端と歯幅方向近傍Ｌとの間の任意の箇所及び歯幅方向他端と歯幅方向近傍Ｌとの間の任意の箇所としてもよい。 (Modification)
The present invention is not limited to the above embodiment, and as shown in FIG. 5, the pressure angle of the tooth width direction center vicinity L of the teeth 4, 5 is the other part (the part other than the tooth width direction center vicinity L). As long as the pressure angle of the teeth 4 and 5 is changed, various methods are conceivable. For example, as shown in the pattern A of FIG. 5, the tooth width direction center vicinity L of the teeth 4 and 5 is set to a constant pressure angle, and the pressure angle of the portion other than the tooth width direction center vicinity of the teeth 4 and 5 is set to the tooth width direction center. You may make it reduce gradually as it goes to the tooth width direction edge part from the vicinity L. FIG. Further, as shown in the B pattern of FIG. 5, the pressure angle may be gradually decreased from the tooth width direction center (Wc) of the teeth 4, 5 toward both ends in the width direction. Further, as in the pattern C in FIG. 5, the portions other than the vicinity of the center of the teeth width direction of the teeth 4 and 5 are set as a constant reference pressure angle, and only the vicinity L of the teeth in the center of the tooth width direction is larger and constant than the reference pressure angle. You may comprise so that it may become the pressure angle of. In FIG. 5, a and b are one end in the tooth width direction and the other end in the tooth width direction of the teeth 4 or 5, or one end of the teeth 4 and 5 in the tooth width direction and the vicinity L in the tooth width direction. It is good also as the arbitrary locations between the arbitrary location between and the other end of the tooth width direction, and the tooth width direction vicinity L.

本発明の実施形態に係る一対の樹脂製やまば歯車を示す図である。It is a figure which shows a pair of resin-made bevel gears which concern on embodiment of this invention. 本発明の実施形態に係る一対の樹脂製やまば歯車のうち、第１やまば歯車を示す図である。このうち（ａ）が第１やまば歯車を模式的に示す部分的平面図、（ｂ）が（ａ）のＡ−Ａ線に沿って切断して示す断面図、（ｃ）が（ａ）のＢ方向から見た図である。It is a figure which shows a 1st spur gear among a pair of resin spur gears concerning embodiment of this invention. Among these, (a) is a partial plan view schematically showing the first spur gear, (b) is a cross-sectional view taken along line AA of (a), and (c) is (a). It is the figure seen from the B direction. 本発明の実施形態に係る一対の樹脂製やまば歯車のうち、第２やまば歯車を示す図である。このうち（ａ）が第２やまば歯車を模式的に示す部分的平面図、（ｂ）が（ａ）のＣ−Ｃ線に沿って切断して示す断面図、（ｃ）が（ａ）のＤ方向から見た図である。It is a figure which shows a 2nd spur gear among a pair of resin spur gears concerning embodiment of this invention. Among these, (a) is a partial plan view schematically showing the second spur gear, (b) is a cross-sectional view taken along line CC of (a), and (c) is (a). It is the figure seen from D direction. 歯幅方向中央の圧力角と強度アップ率目標値との関係を示す図である。It is a figure which shows the relationship between the pressure angle of a tooth width direction center, and intensity | strength improvement rate target value. 本発明の実施形態に係る樹脂製やまば歯車の変形例を示す図である。It is a figure which shows the modification of the resin-made bevel gears which concern on embodiment of this invention.

符号の説明Explanation of symbols

１……一対の樹脂製やまば歯車、２……第１やまば歯車（一方の樹脂製やまば歯車）、３……第２やまば歯車（他方の樹脂製やまば歯車）、４，５……歯、Ｌ……歯幅方向中央近傍、Ｗｃ……全歯幅の中央（歯幅方向中央）   DESCRIPTION OF SYMBOLS 1 ... Pair of resin blind gears, 2 ... 1st helical gear (one plastic helical gear), 3 ... 2nd helical gear (other plastic helical gear), 4, 5 ...... Tooth, L ... Near the center of tooth width direction, Wc ... Center of all tooth widths (center of tooth width direction)

Claims (4)

ねじれが反対のはすば歯車を歯幅方向中央で貼り合わせたような山形形状の歯を多数有する一方の樹脂製やまば歯車と、この一方の樹脂製やまば歯車の前記歯と噛み合う多数の歯を有する他方の樹脂製やまば歯車と、からなる一対の樹脂製やまば歯車において、
前記一方の樹脂製やまば歯車の歯は、少なくとも歯幅方向中央近傍の圧力角が、歯幅方向中央近傍以外の圧力角よりも大きくなるように形成され、
前記他方の樹脂製やまば歯車の歯は、前記一方の樹脂製やまば歯車の前記歯と同一の圧力角の変化となるように形成された、
ことを特徴とする一対の樹脂製やまば歯車。 One resin-made spur gear having a number of chevron-shaped teeth such that helical gears with opposite torsion are bonded together in the center in the width direction of the tooth, and a number of gears that mesh with the teeth of this one resin-made spur gear In a pair of resin-made spur gears comprising the other resin-made spur gears having teeth,
The teeth of the one resin spur gear are formed such that at least the pressure angle near the center in the tooth width direction is larger than the pressure angle other than near the center in the tooth width direction,
The teeth of the other resin-made spur gear are formed to have the same pressure angle change as the teeth of the one-made resin-made spur gear,
A pair of resin-made helical gears. 前記一方の樹脂製やまば歯車の前記歯の歯幅方向中央近傍における圧力角は、歯幅方向中央から歯幅方向端部側へ向かうにしたがって漸減し、
前記一方の樹脂製やまば歯車の前記歯の歯幅方向中央近傍以外における圧力角は、前記歯幅方向中央近傍の圧力角の変化に連続して変化するようになっている、
ことを特徴とする請求項１に記載の一対の樹脂製やまば歯車。 The pressure angle in the vicinity of the tooth width direction center of the tooth of the one of the resin blind gears gradually decreases from the tooth width direction center toward the tooth width direction end side,
The pressure angle other than the vicinity of the center of the tooth width direction of the tooth of the one resin-made spur gear is configured to change continuously with the change of the pressure angle near the center of the tooth width direction.
The pair of resin blind gears according to claim 1. 前記一方の樹脂製やまば歯車の前記歯は、前記歯幅方向中央近傍の圧力角が一定であって、前記歯幅方向中央近傍以外の圧力角が前記歯幅方向中央近傍から離れるにしたがって漸減するようになっている、
ことを特徴とする請求項１に記載の一対の樹脂製やまば歯車。 The teeth of the one of the resin blind gears have a constant pressure angle in the vicinity of the center in the tooth width direction, and the pressure angles other than the vicinity in the center of the tooth width direction gradually decrease as the distance from the center in the tooth width direction increases. Is supposed to
The pair of resin blind gears according to claim 1. 前記一方の樹脂製やまば歯車の前記歯は、前記歯幅方向中央近傍の圧力角が一定であって、前記歯幅方向中央近傍以外の圧力角が前記歯幅方向中央近傍の圧力角よりも小さく且つ一定である、
ことを特徴とする請求項１に記載の一対の樹脂製やまば歯車。 The teeth of the one resin spur gear have a constant pressure angle near the center in the tooth width direction, and a pressure angle other than near the center in the tooth width direction is larger than a pressure angle near the center in the tooth width direction. Small and constant,
The pair of resin blind gears according to claim 1.
JP2006284934A 2006-10-19 2006-10-19 A pair of plastic helical gears Expired - Fee Related JP4697887B2 (en)

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JP5308422B2 (en) * 2010-10-12 2013-10-09 株式会社豊田中央研究所 Involute gear pair
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63180766A (en) * 1987-01-23 1988-07-25 Toyota Motor Corp Profile modified gear
JPH08285048A (en) * 1995-04-18 1996-11-01 Kawasaki Heavy Ind Ltd Three-dimensional tooth surface modification structure in helical/double-helical gear
JPH11118023A (en) * 1997-10-09 1999-04-30 Heishin Kikai Kogyo Kk Gear and gear pump
JP2005069458A (en) * 2003-08-04 2005-03-17 Enplas Corp Resin-made double helical gear, gear train, and ink jet printer
JP2005098369A (en) * 2003-09-24 2005-04-14 Enplas Corp Resin-made herringbone gear

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63180766A (en) * 1987-01-23 1988-07-25 Toyota Motor Corp Profile modified gear
JPH08285048A (en) * 1995-04-18 1996-11-01 Kawasaki Heavy Ind Ltd Three-dimensional tooth surface modification structure in helical/double-helical gear
JPH11118023A (en) * 1997-10-09 1999-04-30 Heishin Kikai Kogyo Kk Gear and gear pump
JP2005069458A (en) * 2003-08-04 2005-03-17 Enplas Corp Resin-made double helical gear, gear train, and ink jet printer
JP2005098369A (en) * 2003-09-24 2005-04-14 Enplas Corp Resin-made herringbone gear

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