JP6424770B2 - Mountain gear - Google Patents

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JP6424770B2
JP6424770B2 JP2015155889A JP2015155889A JP6424770B2 JP 6424770 B2 JP6424770 B2 JP 6424770B2 JP 2015155889 A JP2015155889 A JP 2015155889A JP 2015155889 A JP2015155889 A JP 2015155889A JP 6424770 B2 JP6424770 B2 JP 6424770B2
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gear
gear piece
axial direction
phase
teeth
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JP2017032127A (en
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守弘 松本
守弘 松本
敦 本多
敦 本多
聡弘 塚野
聡弘 塚野
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Toyota Motor Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D2001/103—Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via splined connections

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)

Description

この発明は、軸線方向における一方側の歯の捩れ方向と他方側の歯の捩れ方向とが反対方向を向いて形成されているやまば歯車に関するものである。   The present invention relates to a helical gear formed such that the twisting direction of teeth on one side in the axial direction and the twisting direction of teeth on the other side face in the opposite direction.

特許文献１および特許文献２には、回転軸の軸線方向に対して歯が所定の角度捩れて形成された第１歯車片と、第１歯車片の捩れ方向とは反対方向に歯が捩れて形成された第２歯車片とを一体化させて構成されたやまば歯車が記載されている。このように構成されたやまば歯車は、第１歯車片の位相と第２歯車片の位相とがずれていると、トルク伝達時にいずれか一方の歯車片のみがトルクを伝達することになり、耐久性の低下や異音の発生などの要因となる場合がある。そのため、特許文献１に記載されたやまば歯車は、第１歯車片と第２歯車片とを相対回転可能に組み合わせ、その後、一方の歯車片を回転させることにより二つの歯車片の位相を合わせ、その状態でボルトなどにより第１歯車片と第２歯車片とを一体化している。   According to Patent Document 1 and Patent Document 2, a tooth is twisted in a direction opposite to the twisting direction of the first gear piece, in which the teeth are formed by twisting a predetermined angle with respect to the axial direction of the rotation shaft. A helical gear is described which is integrated with the formed second gear piece. When the phase of the first gear piece and the phase of the second gear piece are out of phase with each other, only one of the gear pieces transmits torque when transmitting torque. It may be a factor such as deterioration of durability and generation of abnormal noise. Therefore, the ring gear described in Patent Document 1 combines the first gear piece and the second gear piece in a relatively rotatable manner, and then, by rotating one gear piece, the phases of the two gear pieces are matched. In this state, the first gear piece and the second gear piece are integrated by a bolt or the like.

なお、特許文献２に記載された第１歯車片は、内周側から軸線方向に突出した軸部が形成されており、その軸部に第２歯車片を嵌合させ、その後、軸部の端部側に形成された雄ネジにナットを締めつけることにより、各歯車片を軸線方向で一体化させている。また、第１歯車片と第２歯車片との対向する面には、それぞれ穴が形成され、それらの穴にピンの両端部を挿入することにより、第１歯車片と第２歯車片とを回転方向で一体化させている。   The first gear piece described in Patent Document 2 is formed with a shaft portion protruding in the axial direction from the inner peripheral side, and the second gear piece is fitted to the shaft portion, and thereafter, the shaft portion Each gear piece is integrated in the axial direction by tightening a nut on a male screw formed on the end side. In addition, holes are respectively formed in the facing surfaces of the first gear piece and the second gear piece, and the first gear piece and the second gear piece are formed by inserting both end portions of the pin into the holes. It integrates in the direction of rotation.

特開昭６１−１２４７６９号公報Japanese Patent Application Laid-Open No. 61-124769 特開２００９−２１６１７６号公報JP, 2009-216176, A

特許文献１に記載されたように、一方の歯車片を回転させて各歯車片の位相を合わせた状態で一体化させる場合には、各歯車片の軸線方向および回転方向の移動を制限した状態を維持しつつ固定することになるので、組み付けが困難になる可能性がある。一方、各特許文献１，２に記載されたように構成されたやまば歯車は、第２歯車片の軸線方向の位置を調整することにより、第１歯車片の歯面の位置に対する第２歯車片の歯面の位置を合わせることができる。しかしながら、各歯車片の軸線方向の距離に制限がある場合には、各歯車片の距離を調整する自由度が小さく、位相差を充分に小さくすることができない可能性がある。また、各歯車片の位相を高精度で調整することが要求される場合には、各歯車片の軸線方向の距離の変化量に対する位相差の変化量が大きいと、軸線方向の距離を高精度で調整する必要があるため、組み付けが困難になる場合がある。したがって、要求される位相の精度や要求される搭載性に応じたやまば歯車を開発する余地があった。   As described in Patent Document 1, when one gear piece is rotated to integrate the gear pieces in a phase-matched state, the movement in the axial direction and the rotational direction of each gear piece is limited. Because it is fixed while maintaining, the assembly may be difficult. On the other hand, the double gear with respect to the position of the tooth surface of the first gear piece by adjusting the position of the second gear piece in the axial direction is configured as described in each of Patent Documents 1 and 2 It is possible to align the tooth flanks of the pieces. However, when the axial distance of each gear piece is limited, the degree of freedom in adjusting the distance between the gear pieces is small, and the phase difference may not be sufficiently reduced. In addition, when it is required to adjust the phase of each gear piece with high accuracy, if the amount of change in the phase difference with respect to the amount of change in the axial direction of each gear piece is large, the distance in the axial direction is highly accurate. Because it is necessary to make adjustments, the assembly may be difficult. Therefore, there is room to develop a helical gear according to the required phase accuracy and the required mountability.

この発明は上記の技術的課題に着目してなされたものであり、各歯車片の距離の変化量に対する位相の調整量を、要求される位相の精度や要求される搭載性に応じて定めることができるやまば歯車を提供することを目的とするものである。   The present invention has been made focusing on the above technical problems, and it is desirable to determine the adjustment amount of the phase with respect to the change amount of the distance of each gear according to the required accuracy of the phase and the required mountability. It is an object of the present invention to provide a helical gear capable of

上記の目的を達成するために、この発明は、軸線方向に所定の長さを有する第１歯が軸線方向に対して所定の方向に捩れて形成された第１歯車片と、軸線方向に所定の長さを有する第２歯が軸線方向に対して前記第１歯とは反対方向に捩れて形成され、かつ前記第１歯車片に一体化した第２歯車片とを備えたやまば歯車において、前記第１歯車片は、前記第２歯車片側に突出した軸部と、軸線方向に所定の長さを有し、かつ前記軸部の外周から外側に突出した凸部とを備え、前記第２歯車片は、前記凸部に回転方向で噛み合う凹部を備え、前記凸部は、軸線方向に対して前記第２歯と同一方向に捩れて形成されていることを特徴とするものである。
In order to achieve the above object, according to the present invention, a first gear piece formed by twisting a first tooth having a predetermined length in the axial direction in a predetermined direction with respect to the axial direction, and a predetermined gear in the axial direction A helical gear including a second gear piece formed to have an axial length in a direction opposite to the first gear and formed integrally with the first gear piece. The first gear piece includes a shaft portion protruding to one side of the second gear, and a convex portion having a predetermined length in the axial direction and protruding outward from the outer periphery of the shaft portion, second gear piece is provided with a recess that mates with the rotation direction of the convex portion, the convex portion is characterized in that in the axis direction are formed is twisted in the second tooth in the same direction .

この発明によれば、第２歯車片が組み付けられる軸部には、軸線方向に対して捩れた凸部が形成されている。したがって、第２歯車片を軸部に係合させるときには、第２歯車片が回転しながら組み付けられる。そのように第２歯車片が回転しながら軸部に組み付けられるように構成することにより、第１歯車片と第２歯車片との軸線方向の距離に起因した位相の調整量に対して、第２歯車片が回転することによる位相の変化量が加減される。そのため、要求される位相の精度や要求される搭載性に応じて、各歯車片の距離に対する位相の調整量を適宜定めることができる。   According to this invention, the convex part twisted with respect to the axial direction is formed in the axial part to which a 2nd gear piece is assembled | attached. Therefore, when the second gear piece is engaged with the shaft portion, the second gear piece is assembled while being rotated. As described above, by configuring the second gear piece to be assembled to the shaft while rotating, the phase adjustment amount due to the axial distance between the first gear piece and the second gear piece can be reduced. The amount of change in phase due to rotation of the gear wheel is adjusted. Therefore, the adjustment amount of the phase with respect to the distance of each gear can be appropriately determined according to the required accuracy of the phase and the required mountability.

この発明の実施例におけるやまば歯車の一例を説明するための参考図である。It is a reference drawing for explaining an example of a helical gear in an example of the present invention. この発明の実施例におけるやまば歯車の他の例を説明するための模式図である。It is a schematic diagram for demonstrating the other example of the helical gear in the Example of this invention. 二つの歯車片をキーにより回転方向で一体化させる構成例を説明するための模式図である。It is a schematic diagram for demonstrating the structural example which integrates two gear pieces in a rotation direction with a key.

この発明の実施例におけるやまば歯車の一例を説明するための参考図を図１に示している。図１に示すやまば歯車１は、回転軸２に一体化された第１歯車片３と、その回転軸２と一体に回転するように嵌合する第２歯車片４とにより構成されている。これら各歯車片３，４には、回転軸２の軸線方向に所定の長さを有する外歯５，６が形成されている。これら第１歯車片３に形成された第１歯５、および第２歯車片４に形成された第２歯６は、やまば歯車１がトルクを伝達している際に、常時、噛み合うように形成されている。具体的には、従来知られているはすば歯車と同様に、回転軸２の軸線方向に対して歯５，６の長手方向が捩れて形成されている。また、回転軸２の軸線方向に対する各歯５，６の捩れ方向が反対に形成されている。つまり、各歯車片３，４を組み合わせたときには、やまば歯車１の歯の形状は、山形になる。
It is shown in Figure 1 a reference diagram for explaining an example of a double-helical gear in the embodiment of the present invention. The lamella gear 1 shown in FIG. 1 is constituted by a first gear piece 3 integrated with the rotary shaft 2 and a second gear piece 4 fitted so as to rotate integrally with the rotary shaft 2 . In each of the gear pieces 3 and 4, external teeth 5 and 6 having a predetermined length in the axial direction of the rotation shaft 2 are formed. The first teeth 5 formed on the first gear piece 3 and the second teeth 6 formed on the second gear piece 4 always mesh with each other when the helical gear 1 is transmitting torque. It is formed. Specifically, the longitudinal direction of the teeth 5 and 6 is formed so as to be twisted with respect to the axial direction of the rotating shaft 2 as in the case of the helical gear known in the prior art. Further, the twisting directions of the respective teeth 5 and 6 with respect to the axial direction of the rotation shaft 2 are formed to be opposite. That is, when the gear pieces 3 and 4 are combined, the shape of the teeth of the helical gear 1 has a chevron shape.

上記第１歯車片３は、第２歯車片４側に突出した係合部７が形成されており、その係合部７の外周面には、回転軸２の軸線方向に対して第１歯５と同一方向に捩れた第１スプライン歯８が形成さている。なお、回転軸２の中心軸線と第１歯５との角度（以下、第１歯５の捩れ角βと記す）と、回転軸２の中心軸線と第１スプライン歯８との角度（以下、第１スプライン歯８の捩れ角度γと記す）とが異なって形成されていてもよく、同一であってもよい。なお、係合部７が、この発明の実施例における「軸部」に相当し、第１スプライン歯８が、この発明の実施例における「凸部」に相当する。   The first gear piece 3 is formed with an engaging portion 7 that protrudes to the second gear piece 4 side, and the outer peripheral surface of the engaging portion 7 has a first tooth in the axial direction of the rotation shaft 2 The first spline teeth 8 twisted in the same direction as 5 are formed. The angle between the central axis of the rotary shaft 2 and the first teeth 5 (hereinafter referred to as a twist angle β of the first teeth 5) and the angle between the central axis of the rotary shaft 2 and the first spline teeth 8 (hereinafter, The twist angle γ) of the first spline teeth 8 may be formed differently or may be the same. The engaging portion 7 corresponds to the "shaft portion" in the embodiment of the present invention, and the first spline teeth 8 correspond to the "convex portion" in the embodiment of the present invention.

さらに、第２歯車片４は、円筒状に形成されており、その内周面に、上記係合部７に形成された第１スプライン歯８と噛み合う、図示しない第２スプライン歯が形成されている。言い換えると、第１スプライン歯８と円周方向で噛み合う凹部が、第２歯車片４の内周面に形成されている。なお、図１に示す例では、第２歯車片４に形成された第２歯６と回転軸２の中心軸線との角度（以下、第２歯６のねじれ角βと記す）は、第１歯５のねじれ角と同一に形成されている。   Furthermore, the second gear piece 4 is formed in a cylindrical shape, and a second spline tooth (not shown) that meshes with the first spline tooth 8 formed in the engaging portion 7 is formed on the inner peripheral surface thereof. There is. In other words, a recess that meshes with the first spline teeth 8 in the circumferential direction is formed on the inner peripheral surface of the second gear piece 4. In the example shown in FIG. 1, the angle between the second teeth 6 formed on the second gear piece 4 and the central axis of the rotation shaft 2 (hereinafter referred to as the twist angle β of the second teeth 6) is the first The twist angle of the teeth 5 is the same.

したがって、第２歯車片４を係合部７に組み付けると、第１歯車片３と第２歯車片４とが一体となって回転する。また、トルク伝達時に、各歯５，６の歯面が接触することにより各歯車片３，４に作用する軸線方向の荷重を相殺させることができるように、第２歯車片４を回転軸２に嵌合させた後に、第２歯車片４を挟んで第１歯車片３とは反対側から、図示しないナットを回転軸２に締め付けている。なお、各歯車片３，４に作用する軸線方向の荷重を相殺することができればよく、つまり、第２歯車片４と、第１歯車片３または回転軸２とを軸線方向で一体化させることができればよい。そのため、上述したようにナットにより第２歯車片４を第１歯車片３との間に挟み付ける構成に限らず、スナップリングによって第２歯車片４が、軸線方向において第１歯車片３から離隔しないように構成してもよく、または、第１歯車片３と第２歯車片４とをボルトによって固定してもよく、あるいは、第２歯車片４を回転軸２、より具体的には、係合部７に圧入して構成していてもよい。さらに、このやまば歯車１は、第２歯車片４を係合部７に係合させる長さを調整することにより、位相を調整するように構成されている。したがって、第２歯車片４の係合量を制限するように、第１歯車片３と第２歯車片４との間に、図示しないシムを挟み付けるように構成していてもよい。また、第１歯車３と第２歯車４との対向する側面を研磨加工するなどしてもよい。   Therefore, when the second gear piece 4 is assembled to the engaging portion 7, the first gear piece 3 and the second gear piece 4 rotate integrally. Further, the second gear piece 4 is rotated about the axis of rotation 2 so that the load in the axial direction acting on the gear pieces 3 and 4 can be offset by contact between the tooth surfaces of the teeth 5 and 6 at the time of torque transmission. After the second gear piece 4 is fitted, a nut (not shown) is tightened on the rotary shaft 2 from the opposite side to the first gear piece 3. In addition, it is only necessary to cancel the load in the axial direction acting on each of the gear pieces 3 and 4, that is, to unify the second gear piece 4 and the first gear piece 3 or the rotary shaft 2 in the axial direction. I hope you can. Therefore, as described above, the second gear piece 4 is separated from the first gear piece 3 in the axial direction without being limited to the configuration in which the second gear piece 4 is held between the first gear piece 3 and the nut. The first gear piece 3 and the second gear piece 4 may be fixed by bolts, or the second gear piece 4 may be fixed to the rotary shaft 2, more specifically, You may press fit into the engaging part 7, and may be comprised. Furthermore, this double ring gear 1 is configured to adjust the phase by adjusting the length of engagement of the second gear piece 4 with the engagement portion 7. Therefore, a shim (not shown) may be held between the first gear piece 3 and the second gear piece 4 so as to limit the amount of engagement of the second gear piece 4. Further, the facing side surfaces of the first gear 3 and the second gear 4 may be polished.

図１に示すやまば歯車１は、第２歯車片４を回転軸２に組み付ける時に、第２歯車片４が軸線方向に移動する量に応じて位相が変化する。ここで示す位相の変化とは、第２歯車片４が回転して第２歯６の歯面の位置が回転方向で変化することによる位相の変化、および第２歯車片４が軸線方向に移動することにより、第２歯６の歯面の位置が軸線方向に移動することに起因して、軸線方向の任意の位置における歯面の位置が回転方向に変化することによる位相の変化を含むものである。以下の説明では、上記のような第２歯車片４の位相の変化量を、位相調整量と示す。   When the second gear piece 4 is assembled to the rotary shaft 2, the phase of the double ring gear 1 shown in FIG. 1 changes in accordance with the amount of movement of the second gear piece 4 in the axial direction. The change of the phase shown here means the change of the phase by the rotation of the second gear 4 and the position of the tooth surface of the second tooth 6 changing in the rotational direction, and the second gear 4 is moved in the axial direction As a result, the position of the tooth surface at an arbitrary position in the axial direction changes in the rotational direction due to the position of the tooth surface of the second tooth 6 moving in the axial direction. . In the following description, the change amount of the phase of the second gear piece 4 as described above is referred to as a phase adjustment amount.

図１に示すやまば歯車１は、第１スプライン歯８と第２スプライン歯とを係合させることによりに第１歯車片３と第２歯車片４とが組み付けられる。その第１スプライン歯８が回転軸２の軸線方向に対して所定の角度捩れているため、第２歯車片４は、第１歯車片３に対して回転（回動）しながら組み付けられる。そのため、第２歯車片４を係合部７に組み付ける長さに応じて位相調整量が変化する。また、上述したように第１歯車片３と第２歯車片４との組み付け量に応じて位相調整量が変化する。その位相調整量は、以下の式で示すことができる。
ｙ＝ｘ・ｔａｎβ−ｘ・２sinγ …（１） In the helical gear 1 shown in FIG. 1, the first gear piece 3 and the second gear piece 4 are assembled by engaging the first spline teeth 8 and the second spline teeth. Since the first spline teeth 8 are twisted at a predetermined angle with respect to the axial direction of the rotation shaft 2, the second gear piece 4 is assembled while being rotated (rotated) with respect to the first gear piece 3. Therefore, the phase adjustment amount changes in accordance with the length of assembling the second gear piece 4 to the engaging portion 7. Further, as described above, the phase adjustment amount changes in accordance with the assembling amount of the first gear piece 3 and the second gear piece 4. The phase adjustment amount can be expressed by the following equation.
y = x · tan β-x · 2 sin γ (1)

なお、式（１）におけるｘは、第２歯車片４の軸線方向での移動量を示し、ｙは、位相調整量を示し、βは、第２歯車片４のねじれ角を示し、γは、第１スプライン歯８のねじれ角を示している。   In the equation (1), x represents the amount of movement of the second gear 4 in the axial direction, y represents the amount of phase adjustment, β represents the twist angle of the second gear 4, and γ represents , Twist angles of the first spline teeth 8 are shown.

式（１）に示す「ｘ・ｔａｎβ」は、第２歯車片４が軸線方向に移動することによる、軸線方向の任意の位置における歯面の回転方向での変化量を示し、「ｘ・２sinγ」は、第２歯車片４が回転することによる位相調整量を示している。したがって、第１スプライン歯８における回転軸２の軸線方向に対する捩れ方向を、回転軸２の軸線方向に対する第２スプライン歯６の捩れ方向と反対方向にすることにより、第２歯車片４の組み付け量（軸線方向の移動量）に対する位相調整量を小さくすることができる。したがって、位相を高精度で調整することが要求される箇所でやまば歯車１を使用する場合には、第２歯車片４の組み付け量を調整することにより、位相調整量を微調整することができる。言い換えると、シムの厚みや圧入する長さなどを高精度で調整する必要がなく、組み付け性を向上させることができる。   “X · tan β” shown in the equation (1) represents the amount of change in the rotation direction of the tooth surface at an arbitrary position in the axial direction due to the second gear piece 4 moving in the axial direction, “x · 2 sin γ "Indicates the phase adjustment amount by the rotation of the second gear piece 4. Therefore, by setting the twisting direction of the first spline teeth 8 with respect to the axial direction of the rotation shaft 2 to be opposite to the twisting direction of the second spline teeth 6 with respect to the axial direction of the rotation shaft 2, the mounting amount of the second gear piece 4 The amount of phase adjustment with respect to (the amount of movement in the axial direction) can be reduced. Therefore, when using the helical gear 1 at a place where it is required to adjust the phase with high accuracy, the phase adjustment amount may be finely adjusted by adjusting the mounting amount of the second gear piece 4. it can. In other words, it is not necessary to adjust the thickness of the shim, the length to be press-fit, etc. with high accuracy, and the assemblability can be improved.

一方、歯数が少ないなどにより位相調整量を大きくする必要があるやまば歯車１は、図２に示すように構成することが好ましい。具体的には、回転軸２の軸線方向に対する第１スプライン歯８の捩れ方向を、図１に示す例とは反対方向に形成すること、言い換えると、第２歯６の捩れ方向と第１スプライン歯８の捩れ方向とを同一方向にすることが好ましい。そのように構成した場合における位相調整量は、以下の式で示すことができる。
ｙ＝ｘ・ｔａｎβ＋ｘ・２sinγ …（２） On the other hand, it is preferable to configure the double gear 1 as shown in FIG. 2 in which it is necessary to increase the phase adjustment amount due to a small number of teeth or the like. Specifically, the twisting direction of the first spline teeth 8 with respect to the axial direction of the rotation shaft 2 is formed in the opposite direction to the example shown in FIG. 1, in other words, the twisting direction of the second teeth 6 and the first spline It is preferable to make the twisting direction of the teeth 8 the same direction. The amount of phase adjustment in such a configuration can be expressed by the following equation.
y = x · tan β + x · 2 sin γ (2)

このように構成することにより、第２歯車片４の組み付け量に対する位相調整量を大きくすることができる。言い換えると、第１歯車片３と第２歯車片４との距離が長くなることなく、位相を調整することができる。したがって、各歯車片３，４の軸線方向の距離に制限がある場合、すなわち、やまば歯車１の搭載スペースに制限がある場合であっても、位相を調整することができる。   By configuring in this manner, it is possible to increase the amount of phase adjustment with respect to the amount of assembly of the second gear piece 4. In other words, the phase can be adjusted without increasing the distance between the first gear piece 3 and the second gear piece 4. Therefore, even when there is a limitation in the axial distance of the gear pieces 3 and 4, that is, even when there is a limitation in the mounting space of the helical gear 1, the phase can be adjusted.

上述したように第２歯車片４を係合部７に係合させるときには、第２歯車片４が回転しながら組み付けられることにより、第１歯車片３と第２歯車片４との軸線方向の距離に起因した位相の調整量に対して、第２歯車片４が回転することによる位相の変化量が加減される。そのため、要求される位相の精度や要求される搭載性に応じて、各歯車片３，４の距離に対する位相の調整量を適宜定めることができる。   As described above, when the second gear piece 4 is engaged with the engaging portion 7, the second gear piece 4 is assembled while being rotated, so that the axial direction of the first gear piece 3 and the second gear piece 4 can be reduced. The amount of change in phase due to the rotation of the second gear 4 is adjusted to the amount of phase adjustment caused by the distance. Therefore, the adjustment amount of the phase with respect to the distance between the gear pieces 3 and 4 can be appropriately determined according to the required accuracy of the phase and the required mountability.

なお、この発明の実施例における「凸部」および「凹部」は、スプライン歯に限らず、図３に示すように係合部７にキー９を形成し、第２歯車片４の内周面にキー９と噛み合う溝を形成していてもよい。その場合には、回転軸２の軸線方向に対するキー９および溝の長手方向が、第１スプライン歯８と同様に捩れて形成されていればよい。   The "convex portion" and the "concave portion" in the embodiment of the present invention are not limited to the spline teeth, and the key 9 is formed on the engaging portion 7 as shown in FIG. The groove may be formed to engage with the key 9. In that case, the longitudinal direction of the key 9 and the groove with respect to the axial direction of the rotary shaft 2 may be twisted and formed in the same manner as the first spline teeth 8.

１…やまば歯車、 ２…回転軸、 ３，４…歯車片、 ５，６…歯、 ７…係合部、 ８…スプライン歯、 ９…キー。   Reference Signs List 1 ... tine gear, 2 ... rotating shaft, 3, 4 ... gear piece, 5, 6 ... tooth, 7 ... engaging portion, 8 ... spline tooth, 9 ... key.

Claims (1)

軸線方向に所定の長さを有する第１歯が軸線方向に対して所定の方向に捩れて形成された第１歯車片と、軸線方向に所定の長さを有する第２歯が軸線方向に対して前記第１歯とは反対方向に捩れて形成され、かつ前記第１歯車片に一体化した第２歯車片とを備えたやまば歯車において、
前記第１歯車片は、前記第２歯車片側に突出した軸部と、軸線方向に所定の長さを有し、かつ前記軸部の外周から外側に突出した凸部とを備え、
前記第２歯車片は、前記凸部に回転方向で噛み合う凹部を備え、
前記凸部は、軸線方向に対して前記第２歯と同一方向に捩れて形成されている
ことを特徴とするやまば歯車。 A first gear piece formed by twisting a first tooth having a predetermined length in the axial direction in a predetermined direction with respect to the axial direction, and a second tooth having a predetermined length in the axial direction with respect to the axial direction A helical gear including a second gear piece formed to be twisted in a direction opposite to the first tooth and integrated with the first gear piece;
The first gear piece includes a shaft portion protruding to one side of the second gear, and a convex portion having a predetermined length in the axial direction and protruding outward from the outer periphery of the shaft portion.
The second gear piece includes a recess that meshes with the protrusion in the rotational direction.
The convex portion is double-helical gears, characterized in that in the axis direction are formed is twisted into the second teeth and the same direction.
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