JP2016120679A - Gear production method, mold and gear - Google Patents
Gear production method, mold and gear Download PDFInfo
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Abstract
Description
本発明は、歯車の製造方法、金型、歯車に関する。 The present invention relates to a gear manufacturing method, a mold, and a gear.
従来、中心部に孔部を有する円盤状の本体部と、この本体部の外周部に形成され、本体部の周方向に配列された複数の歯とを備える歯車がある。また、この種の歯車のなかには、複数の歯の歯先及び複数の歯の間の歯底面の少なくとも一方に、本体部の径方向内側に向けて凹む複数のアンダーカット部がそれぞれ形成されたものがある。 2. Description of the Related Art Conventionally, there is a gear provided with a disk-shaped main body having a hole at the center and a plurality of teeth formed on the outer periphery of the main body and arranged in the circumferential direction of the main body. Also, in this type of gear, a plurality of undercut portions that are recessed toward the radially inner side of the main body portion are formed on at least one of the tooth tips and the bottom surfaces between the plurality of teeth, respectively. There is.
このような複数のアンダーカット部を有する歯車は、一般に、複数の歯及び複数のアンダーカット部を含む本体部の外周部を成形する第一の型と、本体部の軸方向に分割され、本体部の軸方向両端部を成形する第二の型及び第三の型とを備える金型により成形される（例えば、特許文献１参照）。 Such a gear having a plurality of undercut portions is generally divided into a first mold for forming the outer peripheral portion of the main body portion including a plurality of teeth and a plurality of undercut portions, and an axial direction of the main body portion. It is molded by a mold including a second mold and a third mold for molding both axial end portions of the section (see, for example, Patent Document 1).
この金型では、第一の型が周方向に多分割されており、歯車を離型させる際には、多分割された分割型をそれぞれ径方向外側に移動させることで、アンダーカット部と第一の型との干渉を回避するようになっている。 In this mold, the first mold is multi-divided in the circumferential direction, and when releasing the gear, each of the multi-divided divided molds is moved radially outward so that the undercut portion and the first mold are moved. Interference with one mold is avoided.
しかしながら、上述のように、本体部の外周部を成形する第一の型が多分割された場合、金型の構造が複雑化し、コストアップになる。また、アンダーカット部となる部分を成形後に切削で形成することも考えられるが、この場合も、製造工程の増加によりコストアップになる。 However, as described above, when the first mold for molding the outer peripheral portion of the main body is divided into multiple parts, the structure of the mold becomes complicated and the cost increases. In addition, it is conceivable to form a portion to be an undercut portion by cutting after molding, but in this case as well, the cost increases due to an increase in the manufacturing process.
本発明は、上記課題に鑑みてなされたものであって、その目的は、コストダウンできる歯車の製造方法、金型、歯車を提供することを目的とする。 This invention is made | formed in view of the said subject, The objective is to provide the manufacturing method of a gear, a metal mold | die, and a gear which can reduce cost.
上記目的を達成するために、請求項１に記載の歯車の製造方法は、円環形状又は周方向の一部に分離部を有するＣ字形状を成す枠状の本体部と、前記本体部の外周部に形成され、前記本体部の周方向に配列された複数の歯と、前記複数の歯の歯先、前記複数の歯の間の歯底面、及び、前記複数の歯の歯先と歯底面の間の歯面の少なくともいずれかにそれぞれ形成され、前記本体部の径方向内側に向けて凹む複数のアンダーカット部とを有し、歯車を構成する歯形部材を、金型を用いて成形する成形工程と、前記金型のうち、前記複数の歯及び前記複数のアンダーカット部を含む前記本体部の外周部を成形する第一の型を前記本体部の外周部に装着したまま、前記本体部の内周部を成形する第二の型を前記歯形部材に対して分離させ、前記本体部の内側に空間を確保する型開き工程と、前記歯形部材を前記本体部の内側の空間側へ変形させながら前記第一の型から離型させる離型工程と、を備える。 In order to achieve the above object, a method for manufacturing a gear according to claim 1 includes a frame-shaped main body portion having a ring shape or a C-shape having a separating portion in a part of a circumferential direction, and the main body portion. A plurality of teeth formed on the outer peripheral portion and arranged in the circumferential direction of the main body portion, tooth tips of the plurality of teeth, tooth bottom surfaces between the plurality of teeth, and tooth tips and teeth of the plurality of teeth A plurality of undercut portions each formed on at least one of the tooth surfaces between the bottom surfaces and recessed toward the radially inner side of the main body portion, and forming a tooth profile member constituting the gear using a mold The molding step and the mold, the first mold for molding the outer peripheral portion of the main body portion including the plurality of teeth and the plurality of undercut portions is mounted on the outer peripheral portion of the main body portion. Separating the second mold for forming the inner peripheral portion of the main body from the tooth profile member, Comprising of a mold opening step to secure a space on the inside, and a releasing step of releasing from the first mold while deforming the toothed member to the space side of the inside of the main body portion.
この歯車の製造方法によれば、歯車を構成する歯形部材の本体部を従来の円盤状ではなく枠状に形成する。そして、離型工程では、型開き工程において形成した本体部の内側の空間を利用し、歯形部材を本体部の内側の空間側へ変形させながら第一の型から離型させる。従って、本体部の外周部を成形する第一の型を多分割したり、アンダーカット部となる部分を成形後に切削したりする必要が無いので、歯形部材を製造する金型の構造を簡素化できると共に、製造工程の増加も抑制できる。この結果、コストダウンすることができる。 According to this gear manufacturing method, the main body portion of the tooth profile member constituting the gear is formed in a frame shape instead of a conventional disk shape. And in a mold release process, using the space inside the main-body part formed in the mold opening process, it releases from a 1st type | mold, deform | transforming a tooth profile member to the space side inside a main-body part. Therefore, there is no need to divide the first mold that molds the outer peripheral part of the main body part or to cut the part that becomes the undercut part after molding, thus simplifying the structure of the mold for manufacturing the tooth profile member In addition, an increase in the manufacturing process can be suppressed. As a result, the cost can be reduced.
請求項２に記載の歯車の製造方法は、請求項１に記載の歯車の製造方法において、前記成形工程では、前記本体部を円環形状に形成し、前記離型工程では、前記歯形部材を前記本体部の全周に亘って前記本体部の内側の空間側へ変形させながら、前記歯形部材を前記第一の型から離型させる方法である。 The gear manufacturing method according to claim 2 is the gear manufacturing method according to claim 1, wherein in the molding step, the main body is formed in an annular shape, and in the mold releasing step, the tooth profile member is formed. In this method, the tooth profile member is released from the first mold while being deformed to the inner space side of the main body portion over the entire circumference of the main body portion.
この歯車の製造方法によれば、歯形部材の本体部を円環形状に形成するので、歯形部材の剛性を確保することができる。 According to this gear manufacturing method, since the main body of the tooth profile member is formed in an annular shape, the rigidity of the tooth profile member can be ensured.
請求項３に記載の歯車の製造方法は、請求項１に記載の歯車の製造方法において、前記成形工程では、前記本体部をＣ字形状に形成し、前記離型工程では、前記歯形部材を前記本体部の周方向の一端部から他端部へ順に前記本体部の内側の空間側へ変形させながら、前記歯形部材を前記第一の型から離型させる方法である。 The gear manufacturing method according to claim 3 is the gear manufacturing method according to claim 1, wherein in the molding step, the main body is formed in a C shape, and in the mold release step, the tooth profile member is formed. In this method, the tooth profile member is released from the first mold while being deformed in order from one end to the other end in the circumferential direction of the main body toward the space inside the main body.
この歯車の製造方法によれば、本体部をＣ字形状に形成することで、離型工程において、歯形部材を螺旋状に変形させながら容易に離型させることができる。 According to this gear manufacturing method, by forming the main body portion in a C shape, it is possible to easily release the mold while deforming the tooth profile member into a spiral shape in the mold release step.
請求項４に記載の歯車の製造方法は、請求項１〜請求項３のいずれか一項に記載の歯車の製造方法において、前記離型工程の後に、前記本体部の内側に充填材を充填し前記充填材により前記歯形部材と一体に支持部材を形成する二次成形工程をさらに備えている。 The gear manufacturing method according to claim 4 is the gear manufacturing method according to any one of claims 1 to 3, wherein a filler is filled inside the main body after the mold release step. And a secondary forming step of forming a supporting member integrally with the tooth profile member by the filler.
この歯車の製造方法によれば、歯形部材の本体部の内側に支持部材を一体に形成することにより、歯形部材をその内側から支持部材で支持することができる。これにより、歯形部材の剛性を向上させることができる。 According to this gear manufacturing method, the tooth profile member can be supported by the support member from the inside by integrally forming the support member inside the body portion of the tooth profile member. Thereby, the rigidity of a tooth profile member can be improved.
請求項５に記載の歯車の製造方法は、請求項４に記載の歯車の製造方法において、前記成形工程では、前記本体部をＣ字形状に形成し、前記二次成形工程では、前記充填材の一部を前記分離部に充填し前記充填材の一部により前記本体部の周方向の両端部を繋ぐ接続部を形成する方法である。 The gear manufacturing method according to claim 5 is the gear manufacturing method according to claim 4, wherein in the molding step, the main body portion is formed in a C shape, and in the secondary molding step, the filler is formed. Is formed in the separation part, and a connection part is formed by connecting both ends in the circumferential direction of the main body part with a part of the filler.
この歯車の製造方法によれば、本体部の周方向の両端部を繋ぐ接続部を形成することにより、Ｃ字形状に形成された本体部の変形を抑制でき、歯形部材の剛性を確保することができる。 According to this gear manufacturing method, it is possible to suppress the deformation of the C-shaped body part by forming the connection part that connects the circumferential ends of the body part, and to ensure the rigidity of the tooth profile member. Can do.
また、上記目的を達成するために、請求項６に記載の金型は、円環形状又は周方向の一部に分離部を有するＣ字形状を成す枠状の本体部と、前記本体部の外周部に形成され、前記本体部の周方向に配列された複数の歯と、前記複数の歯の歯先、前記複数の歯の間の歯底面、及び、前記複数の歯の歯先と歯底面の間の歯面の少なくともいずれかにそれぞれ形成され、前記本体部の径方向内側に向けて凹む複数のアンダーカット部とを有し、歯車を構成する歯形部材のうち、前記複数の歯及び前記複数のアンダーカット部を含む前記本体部の外周部を成形する成形面を有する第一の型と、前記本体部の内周部を成形する成形面を有する第二の型と、を備える。 In order to achieve the above object, a mold according to claim 6 is an annular shape or a frame-shaped main body portion having a C-shape having a separating portion in a circumferential direction, and the main body portion. A plurality of teeth formed on the outer peripheral portion and arranged in the circumferential direction of the main body portion, tooth tips of the plurality of teeth, tooth bottom surfaces between the plurality of teeth, and tooth tips and teeth of the plurality of teeth A plurality of undercut portions each formed on at least one of the tooth surfaces between the bottom surfaces and recessed toward the radially inner side of the main body portion, and among the tooth-shaped members constituting the gear, the plurality of teeth and A first mold having a molding surface for molding the outer peripheral portion of the main body portion including the plurality of undercut portions; and a second mold having a molding surface for molding the inner peripheral portion of the main body portion.
この金型によれば、上述の成形工程と、割型工程と、離型工程とを備える歯車の製造方法を実現することができるので、コストダウンすることができる。 According to this mold, since it is possible to realize a gear manufacturing method including the above-described forming process, split mold process, and mold release process, the cost can be reduced.
また、上記目的を達成するために、請求項７に記載の歯車は、円環形状又は周方向の一部に分離部を有するＣ字形状を成す枠状の本体部と、前記本体部の外周部に形成され、前記本体部の周方向に配列された複数の歯と、前記複数の歯の歯先、前記複数の歯の間の歯底面、及び、前記複数の歯の歯先と歯底面の間の歯面の少なくともいずれかにそれぞれ形成され、前記本体部の径方向内側に向けて凹む複数のアンダーカット部とを備える。 In order to achieve the above object, the gear according to claim 7 is a ring-shaped body or a frame-shaped main body portion having a C-shape having a separating portion in a circumferential direction, and an outer periphery of the main body portion. A plurality of teeth formed in a portion and arranged in a circumferential direction of the main body, a tooth tip of the plurality of teeth, a tooth bottom surface between the plurality of teeth, and a tooth tip and a tooth bottom surface of the plurality of teeth A plurality of undercut portions that are respectively formed on at least one of the tooth surfaces between the two and are recessed toward the radially inner side of the main body portion.
この歯車によれば、上述の歯車の製造方法により製造されるので、コストダウンすることができる。 According to this gear, since it is manufactured by the above-described gear manufacturing method, the cost can be reduced.
請求項８に記載の歯車は、請求項７に記載の歯車において、前記本体部、前記複数の歯、及び、前記複数のアンダーカット部を有する歯形部材と、前記本体部の内側に充填された充填材により前記歯形部材と一体に形成された支持部材とを備える。 A gear according to an eighth aspect is the gear according to the seventh aspect, wherein the main body portion, the plurality of teeth, and a tooth profile member having the plurality of undercut portions, and the inside of the main body portion are filled. A support member formed integrally with the tooth profile member by a filler.
この歯車によれば、歯形部材の本体部の内側に支持部材が一体に形成されることにより、歯形部材をその内側から支持部材で支持することができる。これにより、歯形部材の剛性を確保することができる。 According to this gear, since the support member is integrally formed inside the main body portion of the tooth profile member, the tooth profile member can be supported by the support member from the inside. Thereby, the rigidity of a tooth profile member is securable.
請求項９に記載の歯車は、請求項８に記載の歯車において、前記本体部がＣ字形状に形成され、前記充填材の一部が前記分離部に充填されることにより形成され前記本体部の周方向の両端部を繋ぐ接続部をさらに備える。 A gear according to a ninth aspect is the gear according to the eighth aspect, wherein the main body portion is formed in a C shape, and a part of the filler is filled in the separation portion, and the main body portion is formed. It further includes a connecting portion that connects both ends in the circumferential direction.
この歯車によれば、本体部の周方向の両端部が接続部により繋がるので、Ｃ字形状に形成された本体部の変形を抑制でき、歯形部材の剛性を確保することができる。 According to this gear, since both ends in the circumferential direction of the main body portion are connected by the connecting portion, deformation of the main body portion formed in a C shape can be suppressed, and the rigidity of the tooth profile member can be ensured.
［第一実施形態］
はじめに、本発明の第一実施形態について説明する。
[First embodiment]
First, a first embodiment of the present invention will be described.
図１，図２に示される本発明の第一実施形態に係る歯車１０は、一例として、ウォームホイールとして構成されており、歯形部材１２と、支持部材１４とを備える。 The gear 10 according to the first embodiment of the present invention shown in FIGS. 1 and 2 is configured as a worm wheel as an example, and includes a tooth profile member 12 and a support member 14.
歯形部材１２は、歯車１０の外周部を構成しており、本体部１６と、複数の歯１８とを有する。本体部１６は、円環形状を成す枠状に形成されている。複数の歯１８は、本体部１６の外周部に形成されており、本体部１６の周方向に配列されている。複数の歯１８は、本体部１６の軸方向に対して若干傾斜して形成されている。 The tooth profile member 12 constitutes the outer peripheral portion of the gear 10, and has a main body portion 16 and a plurality of teeth 18. The main body portion 16 is formed in a frame shape having an annular shape. The plurality of teeth 18 are formed on the outer peripheral portion of the main body portion 16 and are arranged in the circumferential direction of the main body portion 16. The plurality of teeth 18 are formed to be slightly inclined with respect to the axial direction of the main body portion 16.
この複数の歯１８の歯先及び複数の歯１８の間の歯底面には、複数のアンダーカット部２０がそれぞれ形成されている。複数のアンダーカット部２０は、いずれも本体部１６の径方向内側に向けて凹む凹状（一例として湾曲形状）に形成されている。 A plurality of undercut portions 20 are respectively formed on the tooth tips of the plurality of teeth 18 and the bottom surface between the plurality of teeth 18. The plurality of undercut portions 20 are each formed in a concave shape (curved shape as an example) that is recessed toward the radially inner side of the main body portion 16.
図３，図４に示されるように、本体部１６の内周部には、この内周部に沿って円環状のフランジ部２２が形成されている。このフランジ部２２は、本体部１６の軸方向を厚さ方向として形成されている。このフランジ部２２には、このフランジ部２２の表側及び裏側に突出する複数の突出部２４がフランジ部２２の周方向に間隔を空けて形成されている。 As shown in FIGS. 3 and 4, an annular flange portion 22 is formed on the inner peripheral portion of the main body portion 16 along the inner peripheral portion. The flange portion 22 is formed with the axial direction of the main body portion 16 as the thickness direction. A plurality of projecting portions 24 projecting from the front side and the back side of the flange portion 22 are formed in the flange portion 22 at intervals in the circumferential direction of the flange portion 22.
支持部材１４は、円盤状に形成されている。この支持部材１４は、後述する如く二次成形工程において本体部１６の内側に充填された樹脂により形成されており、歯形部材１２と一体に形成されている。 The support member 14 is formed in a disk shape. As will be described later, the support member 14 is formed of a resin filled inside the main body portion 16 in the secondary molding step, and is formed integrally with the tooth profile member 12.
図２，図４に示されるように、支持部材１４が歯形部材１２と一体に形成された状態において、上述のフランジ部２２及び突出部２４は、支持部材１４に埋め込まれて支持部材１４と一体化されている。また、図２に示されるように、支持部材１４は、シャフト２６に対しても一体に形成されており、支持部材１４の中央部には、シャフト２６の先端部が埋め込まれて一体化されている。 As shown in FIGS. 2 and 4, in the state where the support member 14 is formed integrally with the tooth profile member 12, the flange portion 22 and the protrusion 24 described above are embedded in the support member 14 and integrated with the support member 14. It has become. As shown in FIG. 2, the support member 14 is also integrally formed with the shaft 26, and the tip end portion of the shaft 26 is embedded and integrated in the center of the support member 14. Yes.
次に、本発明の第一実施形態に係る金型について説明する。 Next, the metal mold | die which concerns on 1st embodiment of this invention is demonstrated.
図５，図６に示される本発明の第一実施形態に係る金型３０は、上述の歯形部材１２及び支持部材１４を有して構成される歯車１０のうち一次成形品である歯形部材１２を製造するためのものであり、第一の型３２と、第二の型３４とを備える。第一の型３２は、上述の複数の歯１８及び複数のアンダーカット部２０を含む本体部１６の外周部を成形する成形面３６を有しており、円環状に形成されている。 A mold 30 according to the first embodiment of the present invention shown in FIGS. 5 and 6 is a tooth profile member 12 which is a primary molded product among the gears 10 including the above-described tooth profile member 12 and the support member 14. The first mold 32 and the second mold 34 are provided. The first die 32 has a molding surface 36 for molding the outer peripheral portion of the main body portion 16 including the plurality of teeth 18 and the plurality of undercut portions 20 described above, and is formed in an annular shape.
第二の型３４は、固定型３８及び可動型４０を有する。この固定型３８及び可動型４０は、上述の本体部１６の軸方向に分割されており、本体部１６の内周部を成形する成形面４２，４４をそれぞれ有している。この固定型３８及び可動型４０の成形面４２，４４は、円環形状に形成されており、上述の第一の型３２の成形面３６の径方向内側に該成形面３６と対向して配置される。 The second mold 34 has a fixed mold 38 and a movable mold 40. The fixed mold 38 and the movable mold 40 are divided in the axial direction of the main body 16 described above, and have molding surfaces 42 and 44 for molding the inner peripheral portion of the main body 16, respectively. The molding surfaces 42 and 44 of the fixed mold 38 and the movable mold 40 are formed in an annular shape, and are arranged on the radially inner side of the molding surface 36 of the first mold 32 to face the molding surface 36. Is done.
また、固定型３８には、本体部１６の一方の軸方向端部を成形する成形面４６が形成され、可動型４０には、本体部１６の他方の軸方向端部を成形する成形面４８が形成されている。さらに、固定型３８及び可動型４０には、フランジ部２２を成形する成形面５０，５２がそれぞれ形成されている。この金型３０において、上述の複数の成形面に囲まれた空間は、上述の歯形部材１２を成形するためのキャビティ５４を形成している。 The fixed die 38 is formed with a molding surface 46 for molding one axial end portion of the main body portion 16, and the movable die 40 is formed with a molding surface 48 for molding the other axial end portion of the main body portion 16. Is formed. Further, molding surfaces 50 and 52 for molding the flange portion 22 are formed on the fixed mold 38 and the movable mold 40, respectively. In the mold 30, a space surrounded by the plurality of molding surfaces described above forms a cavity 54 for molding the above-described tooth profile member 12.
また、固定型３８には、固定型３８及び可動型４０の分割方向にスライド可能な円筒状の押出しピン５６が設けられている。押出しピン５６は、上述のフランジ部２２の径方向内側の部分と対応する位置に設けられている。さらに、第一の型３２の外周部には、突起状の係止部５８が形成され、固定型３８には、同じく突起状の被係止部６０が形成されている。被係止部６０は、固定型３８及び可動型４０の分割方向において係止部５８に対する可動型４０側に設けられている。この係止部５８及び被係止部６０は、固定型３８及び可動型４０の分割方向に隙間を有して対向している。 The fixed die 38 is provided with a cylindrical push pin 56 that can slide in the dividing direction of the fixed die 38 and the movable die 40. The push pin 56 is provided at a position corresponding to the radially inner portion of the flange portion 22 described above. Further, a protruding locking portion 58 is formed on the outer peripheral portion of the first die 32, and a protruding locking portion 60 is also formed on the fixed die 38. The locked portion 60 is provided on the movable mold 40 side with respect to the locking portion 58 in the dividing direction of the fixed mold 38 and the movable mold 40. The locking portion 58 and the locked portion 60 are opposed to each other with a gap in the dividing direction of the fixed mold 38 and the movable mold 40.
次に、本発明の第一実施形態に係る歯車の製造方法について説明する。 Next, the gear manufacturing method according to the first embodiment of the present invention will be described.
（成形工程）
先ず、図５の上図に示されるように、第一の型３２（歯型入れ子）及び第二の型３４（固定型３８及び可動型４０）が型締めされた状態で、この金型３０の内部に形成されたキャビティ５４に溶融樹脂が注入される。そして、このキャビティ５４に注入された溶融樹脂が冷却されることにより、一次成形品である歯形部材１２が形成される。
(Molding process)
First, as shown in the upper diagram of FIG. 5, the mold 30 is in a state where the first mold 32 (tooth mold insert) and the second mold 34 (fixed mold 38 and movable mold 40) are clamped. Molten resin is injected into the cavity 54 formed inside the inside. Then, the molten resin injected into the cavity 54 is cooled, whereby the tooth profile member 12 that is a primary molded product is formed.
（型開き工程）
続いて、図５の下図に示されるように、可動型４０が上昇され、金型３０が型開きされる。可動型４０は、上昇されることで歯形部材１２から分離される。また、この金型３０の型開きの際には、図６の上図に示されるように、押出しピン５６が上昇し、この押出しピン５６により歯形部材１２が第一の型３２と共に上昇される。第一の型３２が上昇すると、この第一の型３２に形成された係止部５８が固定型３８に形成された被係止部６０に係止され、第一の型３２の上昇が規制される。
(Mold opening process)
Subsequently, as shown in the lower diagram of FIG. 5, the movable mold 40 is raised and the mold 30 is opened. The movable mold 40 is separated from the tooth profile member 12 by being raised. Further, when the mold 30 is opened, as shown in the upper diagram of FIG. 6, the push pin 56 is raised, and the tooth profile member 12 is raised together with the first die 32 by the push pin 56. . When the first die 32 is raised, the locking portion 58 formed on the first die 32 is locked to the locked portion 60 formed on the fixed die 38, and the rising of the first die 32 is restricted. Is done.
また、係止部５８が被係止部６０に係止されるまで歯形部材１２が上昇すると、この歯形部材１２が固定型３８の成形面よりも上側に位置し、歯形部材１２及び固定型３８が分離される。このように、歯形部材１２及び固定型３８が分離された状態では、歯形部材１２の本体部１６の内側に空間６２（逃がし空間６２）が確保される。 Further, when the tooth profile member 12 is raised until the locking portion 58 is locked to the locked portion 60, the tooth profile member 12 is positioned above the molding surface of the fixed mold 38, and the tooth profile member 12 and the fixed mold 38. Are separated. Thus, in a state where the tooth profile member 12 and the fixed mold 38 are separated, a space 62 (relief space 62) is secured inside the main body portion 16 of the tooth profile member 12.
（離型工程）
そして、図６の下図に示されるように、第一の型３２が本体部１６の外周部に装着されたまま、押出しピン５６がさらに上昇される。このとき、係止部５８が被係止部６０に係止されることにより第一の型３２の上昇が規制されているので、歯形部材１２が第一の型３２に対して上方に押圧される。
(Release process)
Then, as shown in the lower diagram of FIG. 6, the push pin 56 is further raised while the first die 32 is mounted on the outer peripheral portion of the main body portion 16. At this time, since the rising of the first mold 32 is restricted by the locking portion 58 being locked to the locked portion 60, the tooth profile member 12 is pressed upward against the first mold 32. The
また、このときには、上述の如く、歯形部材１２の本体部１６の内側に空間６２が確保されているため、押出しピン５６に押圧された歯形部材１２は、内側の空間６２側へ変形される。そして、この歯形部材１２は、内側の空間６２側への変形を伴いながら第一の型３２から離型される。また、歯形部材１２は、円筒状の押出しピン５６によって押圧されるため、本体部１６の全周に亘って本体部１６の内側の空間６２側へ変形されながら第一の型３２から離型される。 At this time, as described above, since the space 62 is secured inside the main body portion 16 of the tooth profile member 12, the tooth profile member 12 pressed by the push pin 56 is deformed toward the inner space 62 side. The tooth profile member 12 is released from the first mold 32 while being deformed toward the inner space 62 side. Further, since the tooth profile member 12 is pressed by the cylindrical extrusion pin 56, it is released from the first mold 32 while being deformed toward the space 62 inside the main body portion 16 over the entire circumference of the main body portion 16. The
なお、この離型工程において、第一の型３２からの歯形部材１２の離型は、歯形部材１２が完全に固化する前の半固化状態で行われるのが望ましい。離型工程では、歯型部材が半固化状態とされることで、歯型部材が全周に亘って一気に離型される。この一次成形品である歯形部材１２は、以上の要領で形成される。 In this mold release step, it is desirable that the tooth profile member 12 is released from the first mold 32 in a semi-solid state before the tooth profile member 12 is completely solidified. In the mold release step, the tooth mold member is brought into a semi-solid state, so that the tooth mold member is released all at once. The tooth profile member 12 that is the primary molded product is formed as described above.
（二次成形工程）
続いて、以上のようにして歯形部材１２が形成された後、歯形部材１２は、別の金型を用いて支持部材１４と一体化される。すなわち、この支持部材１４を成形する二次成形工程では、本体部１６の内側に樹脂が充填され、この樹脂により歯形部材１２と一体に支持部材１４が形成される。また、この支持部材１４が形成される際には、シャフト２６が支持部材１４と一体化される。
(Secondary molding process)
Subsequently, after the tooth profile member 12 is formed as described above, the tooth profile member 12 is integrated with the support member 14 using another mold. That is, in the secondary molding step of molding the support member 14, resin is filled inside the main body portion 16, and the support member 14 is formed integrally with the tooth profile member 12 by this resin. Further, when the support member 14 is formed, the shaft 26 is integrated with the support member 14.
次に、本発明の第一実施形態の作用及び効果について説明する。 Next, the operation and effect of the first embodiment of the present invention will be described.
以上詳述したように、本発明の第一実施形態によれば、歯車１０を構成する歯形部材１２の本体部１６を円盤状ではなく枠状に形成する。そして、離型工程では、型開き工程において形成した本体部１６の内側の空間６２を利用し、歯形部材１２を内側の空間６２側へ変形させながら第一の型３２から離型させる。従って、本体部１６の外周部を成形する第一の型３２を多分割したり、アンダーカット部２０となる部分を成形後に切削したりする必要が無いので、歯形部材１２を製造する金型３０の構造を簡素化できると共に、製造工程の増加も抑制できる。この結果、コストダウンすることができる。 As described above in detail, according to the first embodiment of the present invention, the body portion 16 of the tooth profile member 12 constituting the gear 10 is formed in a frame shape instead of a disc shape. In the mold release step, the space 62 inside the main body 16 formed in the mold opening step is used to release the first profile 32 from the first mold 32 while deforming the tooth profile member 12 toward the space 62 inside. Therefore, it is not necessary to divide the first die 32 for molding the outer peripheral portion of the main body portion 16 into multiple parts or to cut the portion that becomes the undercut portion 20 after molding. The structure can be simplified, and an increase in the manufacturing process can be suppressed. As a result, the cost can be reduced.
また、成形工程では、歯形部材１２の本体部１６を円環形状に形成するので、歯形部材１２の剛性を確保することができる。 Moreover, since the main-body part 16 of the tooth profile member 12 is formed in an annular shape in the molding step, the rigidity of the tooth profile member 12 can be ensured.
さらに、二次成形工程において、歯形部材１２の本体部１６の内側に支持部材１４を一体に形成することにより、歯形部材１２をその内側から支持部材１４で支持することができる。これにより、歯形部材１２の剛性を向上させることができる。 Furthermore, in the secondary molding step, by forming the support member 14 integrally inside the body portion 16 of the tooth profile member 12, the tooth profile member 12 can be supported by the support member 14 from the inside thereof. Thereby, the rigidity of the tooth profile member 12 can be improved.
次に、本発明の第一実施形態の変形例について説明する。 Next, a modification of the first embodiment of the present invention will be described.
上述の第一実施形態では、複数の歯１８の歯先及び複数の歯１８の間の歯底面にアンダーカット部２０がそれぞれ形成されているが、アンダーカット部２０は、複数の歯１８の歯先及び複数の歯１８の間の歯底面のどちらか一方にのみ形成されていても良い。 In the first embodiment described above, the undercut portions 20 are formed on the tooth tips of the plurality of teeth 18 and the tooth bottom surfaces between the plurality of teeth 18, respectively. It may be formed only on one of the root surfaces between the tip and the plurality of teeth 18.
また、アンダーカット部２０は、複数の歯１８の歯先、複数の歯１８の間の歯底面、及び、複数の歯１８の歯先と歯底面の間の歯面の少なくともいずれかに形成されても良い。 The undercut portion 20 is formed on at least one of the tooth tips of the plurality of teeth 18, the tooth bottom surface between the plurality of teeth 18, and the tooth surface between the tooth tip and the tooth bottom surface of the plurality of teeth 18. May be.
また、歯車１０は、支持部材１４を備えているが、例えば完全に固化した状態で歯形部材１２の剛性を確保できる場合には、支持部材１４が省かれても良い。 Moreover, although the gearwheel 10 is provided with the support member 14, when the rigidity of the tooth-shaped member 12 can be ensured, for example in the state solidified completely, the support member 14 may be omitted.
また、離型工程において、第一の型３２からの歯形部材１２の離型は、歯形部材１２が完全に固化する前の半固化状態で行われるのが望ましいが、完全に固化した状態でも歯形部材１２の変形が容易である場合には、歯形部材１２の離型が歯形部材１２の完全固化状態で行われても良い。 In the mold release process, it is desirable that the tooth profile member 12 is released from the first mold 32 in a semi-solid state before the tooth profile member 12 is completely solidified. When the deformation of the member 12 is easy, the tooth profile member 12 may be released while the tooth profile member 12 is completely solidified.
また、離型工程においては、歯形部材１２が、押出しピン５６によって押されることにより第一の型３２から離型されるが、歯形部材１２が固定された状態で第一の型３２が歯形部材１２に対して移動することにより、歯形部材１２が第一の型３２から離型されても良い。 Further, in the mold release step, the tooth profile member 12 is released from the first mold 32 by being pushed by the push pin 56, but the first mold 32 is the tooth profile member in a state where the tooth profile member 12 is fixed. The tooth profile member 12 may be released from the first mold 32 by moving relative to the first mold 32.
また、離型工程において、歯形部材１２は、本体部１６の全周に亘って本体部１６の内側の空間６２側へ変形されながら第一の型３２から離型されるが、本体部１６の周方向の一の部位から順に内側の空間６２側へ変形されながら第一の型３２から離型されても良い。 In the mold release step, the tooth profile member 12 is released from the first mold 32 while being deformed toward the space 62 inside the main body 16 over the entire circumference of the main body 16. The mold may be released from the first mold 32 while being deformed in order from one portion in the circumferential direction toward the inner space 62 side.
また、歯車１０は、一例として、ウォームホイールとして構成されているが、ウォームホイール以外の歯車として構成されていても良い。 The gear 10 is configured as a worm wheel as an example, but may be configured as a gear other than the worm wheel.
また、歯形部材１２は、一例として、樹脂により形成されているが、例えば、金属など樹脂以外の材料で形成されても良い。同様に、支持部材１４も、本体部１６の内側に充填される「充填材」の一例として樹脂により形成されているが、例えば、金属など樹脂以外の材料で形成されても良い。 Moreover, although the tooth-shaped member 12 is formed of resin as an example, it may be formed of a material other than resin such as metal. Similarly, the support member 14 is also formed of a resin as an example of a “filler” filled inside the main body 16, but may be formed of a material other than a resin such as a metal, for example.
［第二実施形態］
次に、本発明の第二実施形態について説明する。
[Second Embodiment]
Next, a second embodiment of the present invention will be described.
図７に示される本発明の第二実施形態に係る歯車７０は、上述の第一実施形態に係る歯車１０に対して、歯形部材１２の構造が次のように変更されている。すなわち、図７，図８に示されるように、本発明の第二実施形態において、歯形部材１２の本体部１６は、その周方向の一部に分離部７２を有するＣ字形状を成す枠状に形成されている。 In the gear 70 according to the second embodiment of the present invention shown in FIG. 7, the structure of the tooth profile member 12 is changed as follows with respect to the gear 10 according to the first embodiment described above. That is, as shown in FIGS. 7 and 8, in the second embodiment of the present invention, the body portion 16 of the tooth profile member 12 is a frame shape having a C shape having a separation portion 72 in a part of the circumferential direction. Is formed.
本発明の第二実施形態において、歯形部材１２は、上述の第一実施形態における成形工程及び型開き工程と同様の工程を経て製造される。ただし、離型工程では、次のようにして歯形部材１２が第一の型３２から離型される。 In the second embodiment of the present invention, the tooth profile member 12 is manufactured through the same processes as the molding process and the mold opening process in the first embodiment described above. However, in the mold release step, the tooth profile member 12 is released from the first mold 32 as follows.
図９には、第二実施形態の離型工程において歯形部材１２が第一の型３２から離型される様子が示されている。この図９では、第二の型３４の固定型３８及び可動型４０（図５，図６参照）は不図示とされている。第一の型３２には、第一実施形態における円筒状の押出しピン７６（図５，図６参照）の代わりに、複数の棒状の押出しピン７６が設けられている。複数の押出しピン７６は、本体部１６の周方向に配列されている。 FIG. 9 shows how the tooth profile member 12 is released from the first mold 32 in the mold release step of the second embodiment. In FIG. 9, the fixed die 38 and the movable die 40 (see FIGS. 5 and 6) of the second die 34 are not shown. The first die 32 is provided with a plurality of rod-like push pins 76 instead of the cylindrical push pins 76 (see FIGS. 5 and 6) in the first embodiment. The plurality of push pins 76 are arranged in the circumferential direction of the main body portion 16.
そして、第二実施形態の離型工程では、本体部１６の周方向の一端部に位置する押出しピン７６から順に複数の押出しピン７６が上昇される。これにより、歯形部材１２が、本体部１６の周方向の一端部から他端部へ順に本体部１６の内側の空間６２側へ変形させられながら第一の型３２から離型される。 And in the mold release process of 2nd embodiment, the some extrusion pin 76 is raised in order from the extrusion pin 76 located in the one end part of the circumferential direction of the main-body part 16. As shown in FIG. As a result, the tooth profile member 12 is released from the first mold 32 while being deformed in order from one end portion in the circumferential direction of the main body portion 16 to the other end portion in the space 62 side inside the main body portion 16.
また、このようにしてＣ字状の本体部１６を有するように形成された歯形部材１２には、第一実施形態と同様の二次成形工程において、図７に示される支持部材１４が一体に形成され、この歯形部材１２及び支持部材１４により、第二実施形態の歯車７０が形成される。 In addition, the tooth-shaped member 12 formed to have the C-shaped main body portion 16 in this way is integrally provided with the support member 14 shown in FIG. 7 in the same secondary molding process as that of the first embodiment. The gear member 70 of the second embodiment is formed by the tooth profile member 12 and the support member 14.
このように、第二実施形態によれば、本体部１６をＣ字形状に形成するので、離型工程において、歯形部材１２を螺旋状に変形させながら容易に離型させることができる。 Thus, according to 2nd embodiment, since the main-body part 16 is formed in C shape, in a mold release process, it can be made to mold release easily, changing the tooth profile member 12 helically.
また、歯形部材１２の本体部１６の内側には、支持部材１４が一体に形成されるので、Ｃ字形状に形成された歯形部材１２をその内側から支持部材１４で支持することができる。これにより、歯形部材１２の剛性を確保することができる。 Moreover, since the support member 14 is integrally formed inside the main body portion 16 of the tooth profile member 12, the tooth profile member 12 formed in a C shape can be supported by the support member 14 from the inside thereof. Thereby, the rigidity of the tooth profile member 12 can be ensured.
また、第二実施形態のように、本体部１６がＣ字形状に形成されていると、第一実施形態のように本体部１６が円環形状に形成される場合に比して、本体部１６の内周部における形状の設計の自由度を高めることができる。これにより、例えば、図１０に示されるように、本体部１６の内周部を、例えば、強度が高くなる形状にしたり、二次成形品である支持部材１４との保持強度の高い形状にしたりすることができる。この第二実施形態では、一例として、歯形部材１２からは上述の突出部２４（図４参照）が省かれている。 In addition, when the main body portion 16 is formed in a C shape as in the second embodiment, the main body portion is compared with the case where the main body portion 16 is formed in an annular shape as in the first embodiment. The degree of freedom in designing the shape of the 16 inner peripheral portions can be increased. Thereby, for example, as shown in FIG. 10, the inner peripheral portion of the main body portion 16 is, for example, formed into a shape with high strength or a shape with high holding strength with the support member 14 that is a secondary molded product. can do. In the second embodiment, as an example, the above-described protruding portion 24 (see FIG. 4) is omitted from the tooth profile member 12.
なお、上述の第二実施形態において、歯車７０がウォームホイールである場合、上述のＣ字形状の本体部１６に形成された分離部７２は、ウォームが乗り越え可能な寸法で形成されるのが望ましい。 In the second embodiment described above, when the gear 70 is a worm wheel, it is desirable that the separation portion 72 formed on the C-shaped main body portion 16 is formed with a size that allows the worm to get over. .
また、この分離部７２には、二次成形工程において本体部１６の内側に充填された充填剤の一部が充填されることにより、図１１に示される如く本体部１６の周方向の両端部を繋ぐ接続部７８が形成されても良い。 Further, the separation portion 72 is filled with a part of the filler filled inside the main body portion 16 in the secondary molding step, so that both end portions in the circumferential direction of the main body portion 16 as shown in FIG. The connection part 78 which connects may be formed.
このように、本体部１６の周方向の両端部を繋ぐ接続部７８が形成されていると、Ｃ字形状に形成された本体部１６の変形を抑制でき、歯形部材１２の剛性を確保することができる。 Thus, when the connection part 78 which connects the both ends of the circumferential direction of the main-body part 16 is formed, the deformation | transformation of the main-body part 16 formed in C-shape can be suppressed, and the rigidity of the tooth profile member 12 is ensured. Can do.
また、上述の第二実施形態において、複数の歯１８の歯先及び複数の歯１８の間の歯底面にアンダーカット部２０がそれぞれ形成されているが、アンダーカット部２０は、複数の歯１８の歯先及び複数の歯１８の間の歯底面のどちらか一方にのみ形成されていても良い。 In the second embodiment described above, the undercut portions 20 are formed on the tooth tips of the plurality of teeth 18 and the tooth bottom surfaces between the plurality of teeth 18, respectively. It may be formed only on either one of the tooth tip and the tooth bottom surface between the plurality of teeth 18.
また、歯車７０は、支持部材１４を備えているが、例えば完全に固化した状態で歯形部材１２の剛性を確保できる場合には、支持部材１４が省かれても良い。 The gear 70 includes the support member 14. However, the support member 14 may be omitted when the rigidity of the tooth profile member 12 can be ensured in a completely solidified state, for example.
また、離型工程において、第一の型３２からの歯形部材１２の離型は、歯形部材１２が完全に固化する前の半固化状態で行われるのが望ましいが、完全に固化した状態でも歯形部材１２の変形が容易である場合には、歯形部材１２の離型が歯形部材１２の完全固化状態で行われても良い。 In the mold release process, it is desirable that the tooth profile member 12 is released from the first mold 32 in a semi-solid state before the tooth profile member 12 is completely solidified. When the deformation of the member 12 is easy, the tooth profile member 12 may be released while the tooth profile member 12 is completely solidified.
また、離型工程においては、歯形部材１２が、押出しピン７６によって押されることにより第一の型３２から離型されるが、歯形部材１２が固定された状態で第一の型３２が歯形部材１２に対して移動することにより、歯形部材１２が第一の型３２から離型されても良い。 Further, in the mold release step, the tooth profile member 12 is released from the first mold 32 by being pushed by the push pin 76. However, the first mold 32 is the tooth profile member in a state where the tooth profile member 12 is fixed. The tooth profile member 12 may be released from the first mold 32 by moving relative to the first mold 32.
また、歯車７０は、一例として、ウォームホイールとして構成されているが、ウォームホイール以外の歯車１０として構成されていても良い。 The gear 70 is configured as a worm wheel as an example, but may be configured as a gear 10 other than the worm wheel.
また、第二実施形態において、歯形部材１２は、一例として、樹脂により形成されているが、例えば、金属など樹脂以外の材料で形成されても良い。同様に、支持部材１４も、本体部１６の内側に充填される充填材の一例として樹脂により形成されているが、例えば、金属など樹脂以外の材料で形成されても良い。 Moreover, in 2nd embodiment, although the tooth-shaped member 12 is formed with resin as an example, for example, you may form with materials other than resin, such as a metal. Similarly, the support member 14 is also formed of a resin as an example of a filler that fills the inside of the main body 16, but may be formed of a material other than a resin such as metal, for example.
以上、本発明の第一及び第二実施形態について説明したが、本発明は、上記に限定されるものでなく、上記以外にも、その主旨を逸脱しない範囲内において種々変形して実施可能であることは勿論である。 The first and second embodiments of the present invention have been described above. However, the present invention is not limited to the above, and various modifications can be made without departing from the spirit of the present invention. Of course there is.
１０，７０…歯車、１２…歯形部材、１４…支持部材、１６…本体部、１８…歯、２０…アンダーカット部、３０…金型、３２…第一の型、３４…第二の型、３８…固定型、４０…可動型、６２…本体部の内側の空間（逃がし空間）、７２…分離部、７８…接続部 DESCRIPTION OF SYMBOLS 10,70 ... Gear, 12 ... Tooth profile member, 14 ... Support member, 16 ... Body part, 18 ... Teeth, 20 ... Undercut part, 30 ... Mold, 32 ... First mold, 34 ... Second mold, 38 ... fixed type, 40 ... movable type, 62 ... space inside the main body (relief space), 72 ... separation part, 78 ... connection part
Claims (9)
前記金型のうち、前記複数の歯及び前記複数のアンダーカット部を含む前記本体部の外周部を成形する第一の型を前記本体部の外周部に装着したまま、前記本体部の内周部を成形する第二の型を前記歯形部材に対して分離させ、前記本体部の内側に空間を確保する型開き工程と、
前記歯形部材を前記本体部の内側の空間側へ変形させながら前記第一の型から離型させる離型工程と、
を備える歯車の製造方法。 A frame-shaped main body portion having a ring shape or a C-shape having a separation part in a circumferential direction, and a plurality of teeth formed on the outer peripheral portion of the main body portion and arranged in the circumferential direction of the main body portion Each of the tooth tips of the plurality of teeth, a tooth bottom surface between the plurality of teeth, and a tooth surface between the tooth tip and the tooth bottom surface of the plurality of teeth, and the diameter of the main body portion. A molding step having a plurality of undercut portions recessed toward the inside in the direction and forming a tooth profile member constituting the gear using a mold;
Among the molds, the inner periphery of the main body portion is attached to the outer peripheral portion of the main body portion while the first die for forming the outer peripheral portion of the main body portion including the plurality of teeth and the plurality of undercut portions is attached. A mold opening step for separating a second mold for molding a part from the tooth profile member and securing a space inside the main body part;
A mold release step of releasing the first profile from the first mold while deforming the tooth profile member toward the space inside the main body;
A method of manufacturing a gear comprising:
前記離型工程において、前記歯形部材を前記本体部の全周に亘って前記本体部の内側の空間側へ変形させながら、前記歯形部材を前記第一の型から離型させる、
請求項１に記載の歯車の製造方法。 In the molding step, the main body is formed in an annular shape,
In the mold release step, the tooth profile member is released from the first mold while the tooth profile member is deformed to the inner space side of the main body section over the entire circumference of the main body section.
The gear manufacturing method according to claim 1.
前記離型工程において、前記歯形部材を前記本体部の周方向の一端部から他端部へ順に前記本体部の内側の空間側へ変形させながら、前記歯形部材を前記第一の型から離型させる、
請求項１に記載の歯車の製造方法。 In the molding step, the main body is formed in a C shape,
In the mold release step, the tooth profile member is released from the first mold while the tooth profile member is sequentially deformed from one circumferential end portion to the other end portion of the main body portion toward the inner space of the main body portion. Let
The gear manufacturing method according to claim 1.
請求項１〜請求項３のいずれか一項に記載の歯車の製造方法。 After the mold release step, further comprising a secondary molding step of filling a filler inside the main body and forming a support member integrally with the tooth profile member by the filler.
The manufacturing method of the gear as described in any one of Claims 1-3.
前記二次成形工程において、前記充填材の一部を前記分離部に充填し前記充填材の一部により前記本体部の周方向の両端部を繋ぐ接続部を形成する、
請求項４に記載の歯車の製造方法。 In the molding step, the main body is formed in a C shape,
In the secondary molding step, a part of the filler is filled into the separation part, and a connecting part is formed by connecting a part of the filler in the circumferential direction with the part of the filler.
The manufacturing method of the gearwheel of Claim 4.
前記本体部の内周部を成形する成形面を有する第二の型と、
を備える金型。 A frame-shaped main body portion having a ring shape or a C-shape having a separation part in a circumferential direction, and a plurality of teeth formed on the outer peripheral portion of the main body portion and arranged in the circumferential direction of the main body portion Each of the tooth tips of the plurality of teeth, a tooth bottom surface between the plurality of teeth, and a tooth surface between the tooth tip and the tooth bottom surface of the plurality of teeth, and the diameter of the main body portion. A molding surface for molding the outer peripheral portion of the main body portion including the plurality of teeth and the plurality of undercut portions among the tooth-shaped members constituting the gear. A first mold having,
A second mold having a molding surface for molding the inner periphery of the main body,
Mold with.
前記本体部の外周部に形成され、前記本体部の周方向に配列された複数の歯と、
前記複数の歯の歯先、前記複数の歯の間の歯底面、及び、前記複数の歯の歯先と歯底面の間の歯面の少なくともいずれかにそれぞれ形成され、前記本体部の径方向内側に向けて凹む複数のアンダーカット部と、
を備える歯車。 A frame-shaped main body part having an annular shape or a C-shape having a separating part in the circumferential direction;
A plurality of teeth formed on the outer periphery of the main body and arranged in the circumferential direction of the main body;
Each of the tooth tips of the plurality of teeth, a tooth bottom surface between the plurality of teeth, and a tooth surface between the tooth tip and the tooth bottom surface of the plurality of teeth, respectively, and the radial direction of the main body portion A plurality of undercut portions recessed toward the inside;
Gear with.
前記本体部の内側に充填された充填材により前記歯形部材と一体に形成された支持部材とを備える、
請求項７に記載の歯車。 A tooth profile member having the body portion, the plurality of teeth, and the plurality of undercut portions;
A support member formed integrally with the tooth profile member by a filler filled inside the main body,
The gear according to claim 7.
前記充填材の一部が前記分離部に充填されることにより形成され、前記本体部の周方向の両端部を繋ぐ接続部をさらに備える、
請求項８に記載の歯車。 The main body is formed in a C shape,
A part of the filler is formed by filling the separation part, and further includes a connection part that connects both ends in the circumferential direction of the main body part,
The gear according to claim 8.
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| JPH11286032A (en) * | 1998-12-22 | 1999-10-19 | Sakae Kanagata Kogyo:Kk | Apparatus and method for injection molding worm wheel and worm wheel |
| JP2003094482A (en) * | 2001-09-26 | 2003-04-03 | Oshima Denki Seisakusho:Kk | Resin gear and its production method |
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| JPH11286032A (en) * | 1998-12-22 | 1999-10-19 | Sakae Kanagata Kogyo:Kk | Apparatus and method for injection molding worm wheel and worm wheel |
| JP2003094482A (en) * | 2001-09-26 | 2003-04-03 | Oshima Denki Seisakusho:Kk | Resin gear and its production method |
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| DE102017109915A1 (en) | 2016-06-17 | 2017-12-21 | Subaru Corporation | Travel control device for vehicle |
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