JP2008221687A - Molding die of resin helical gear and resin helical gear molded using the same - Google Patents

Molding die of resin helical gear and resin helical gear molded using the same Download PDF

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JP2008221687A
JP2008221687A JP2007064725A JP2007064725A JP2008221687A JP 2008221687 A JP2008221687 A JP 2008221687A JP 2007064725 A JP2007064725 A JP 2007064725A JP 2007064725 A JP2007064725 A JP 2007064725A JP 2008221687 A JP2008221687 A JP 2008221687A
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mold
helical gear
resin
molding die
piece
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JP4846631B2 (en
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Koji Kobayashi
孝次 小林
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Ricoh Co Ltd
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Ricoh Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding die enabling a molding of a resin helical gear having a helical-shaped tooth part of a high accuracy with a simple constitution. <P>SOLUTION: The invention is the molding die 30 to mold the resin helical gear which has a large-diameter portion having a larger diameter than the diameter of a turning shank, and in which the helical-shaped tooth part is formed on the outer periphery of the turning shank, and at the same time, the helical-shaped tooth part is formed on the outer periphery of the large-diameter portion. Further, at the large-diameter portion, a web is formed between the outer periphery and the turning shank. The die comprises a steerable type 32 and a fixed mount type 31 constituted by moving in concert a cavity 33' corresponding to the shape of the turning shank and the shape with the large-diameter portion. A rotating piece 33 to form a cavity corresponding to the tooth part formed on the outer periphery of the large-diameter portion is rotatably provided on the fixed mount type 31, and a fixed piece 35 to form a cavity corresponding to the tooth part formed on the outer periphery of the turning shank is provided on the steerable type 32. On the fixed mount type 31, an opening 37 of a gate 36 injecting a molten resin to the cavity is provided on a distance place from each tooth part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、樹脂製ヘリカル歯車の成形金型及びこの成形金型を用いて成形された樹脂製ヘリカル歯車の改良に関する。   The present invention relates to a molding die for a resin helical gear and an improvement of a resin helical gear molded using the molding die.

従来から、樹脂製ヘリカル歯車、例えば、図１に示す二段歯車構造の樹脂製はすば歯車１には、回動軸部（ボス部）２とこの回動軸部２の直径よりも大径でかつ回動軸部２と同軸の大径部３とを有するものが知られている。その回動軸部２は貫通穴２ａを有する。   2. Description of the Related Art Conventionally, a resin helical gear, for example, a resin helical gear 1 having a two-stage gear structure shown in FIG. 1, has a rotating shaft portion (boss portion) 2 and a diameter larger than that of the rotating shaft portion 2. One having a large-diameter portion 3 having a diameter and a rotation shaft portion 2 and the same axis is known. The rotating shaft portion 2 has a through hole 2a.

その回動軸部２の外周部にはその一端部側にヘリカル形状の歯部４が形成されている。大径部３はその回動軸部２の他端側に設けられ、大径部３の外周部にはヘリカル形状の歯部５が形成されている。   A helical tooth portion 4 is formed on the outer peripheral portion of the rotating shaft portion 2 on one end side. The large diameter portion 3 is provided on the other end side of the rotating shaft portion 2, and a helical tooth portion 5 is formed on the outer peripheral portion of the large diameter portion 3.

その大径部３とこの大径部３の外周部との間には薄板状のウエブ６とされており、このウエブ６にはその他端側に向く面の側に図２（ａ）、（ｂ）に示すように、回動軸部２と同心の環状リブ３ａ、３ｂと回動軸部２を中心にして放射状に延びる放射状リブ３ｃ、３ｄが設けられている。その大径部３の一端側を向く面の側には環状溝３ｅが形成されている。   A thin plate-like web 6 is formed between the large-diameter portion 3 and the outer peripheral portion of the large-diameter portion 3, and the web 6 is arranged on the side facing the other end in FIG. As shown in b), annular ribs 3a and 3b concentric with the rotating shaft 2 and radial ribs 3c and 3d extending radially about the rotating shaft 2 are provided. An annular groove 3e is formed on the side of the large diameter portion 3 facing the one end side.

この樹脂製はすば歯車１は、例えば、図３に示す樹脂製はすば歯車成形用の成形金型７を用いて成形される。   The resin helical gear 1 is formed by using, for example, a molding die 7 for forming a resin helical gear shown in FIG.

その成形金型７は、一対の分割金型としての固定型８と可動型９とから大略構成されている。この固定型８と可動型９とは協働して回動軸部２の形状と大径部３の形状とに対応するキャビティ１０を構成している。固定型８には回転駒１１がボールベアリング１２を介して回転可能に設けられている。回転駒１１には歯部４に対応するキャビティ１１ａが設けられている。   The molding die 7 is generally composed of a fixed die 8 and a movable die 9 as a pair of split dies. The fixed die 8 and the movable die 9 cooperate to constitute a cavity 10 corresponding to the shape of the rotating shaft portion 2 and the shape of the large diameter portion 3. A rotating piece 11 is rotatably provided on the fixed mold 8 via a ball bearing 12. The rotary piece 11 is provided with a cavity 11 a corresponding to the tooth portion 4.

可動型９には主として大径部３に対応するキャビティ１３ａを形成するための金型駒１３と主として貫通穴２ａを形成するための金型駒１４と主としてリム部３ｃを形成するための金型駒１５とが設けられている。   The movable die 9 mainly includes a die piece 13 for forming a cavity 13a corresponding to the large diameter portion 3, a die piece 14 for mainly forming a through hole 2a, and a die for mainly forming a rim portion 3c. A piece 15 is provided.

その金型駒１３にはボールベアリング１６を介して回転駒１７が回転可能に設けられている。   A rotary piece 17 is rotatably provided on the mold piece 13 via a ball bearing 16.

固定型８にはゲート１８が設けられ、このゲート１８は回動軸部２の歯部４が形成されている端面（一側端面）２ｂ（図４参照）に対応する箇所に開口１８ａを有する。この開口１８ａは貫通穴２ａの周回り方向に複数個設けられている。   The fixed mold 8 is provided with a gate 18, and the gate 18 has an opening 18 a at a position corresponding to an end surface (one side end surface) 2 b (see FIG. 4) where the tooth portion 4 of the rotating shaft portion 2 is formed. . A plurality of openings 18a are provided in the circumferential direction of the through hole 2a.

樹脂製はすば歯車１の成形は、ゲート１８から矢印Ａ１で示すように加圧溶融樹脂を注入し、加圧溶融樹脂を冷却硬化させて樹脂製はすば歯車１を成形する。   The resin helical gear 1 is formed by injecting a pressurized molten resin from the gate 18 as indicated by an arrow A1, and cooling and curing the pressurized molten resin to form the resin helical gear 1.

次に、固定型８から離間させる方向矢印Ａ２方向に可動型９を駆動する。   Next, the movable die 9 is driven in the direction of the arrow A <b> 2 that is separated from the fixed die 8.

すると、樹脂製はすば歯車１の歯部４がヘリカル形状であるので、回転駒１１が回転され、樹脂製はすば歯車１の回動軸部２に相当する成形部が固定型８から離脱される。   Then, since the tooth part 4 of the resin helical gear 1 has a helical shape, the rotary piece 11 is rotated, and a molding part corresponding to the rotation shaft part 2 of the resin helical gear 1 is moved from the fixed die 8. Will be withdrawn.

ついで、二点鎖線で示すイジェクトピン１９を矢印Ａ３方向に可動させる。すると、回転駒１７が回転され、樹脂製はすば歯車１の大径部３が可動型９から離脱され、これにより、樹脂製はすば歯車１が可動型９から取り外される。   Next, the eject pin 19 indicated by the two-dot chain line is moved in the arrow A3 direction. Then, the rotary piece 17 is rotated, and the large-diameter portion 3 of the resin helical gear 1 is detached from the movable die 9, whereby the resin helical gear 1 is removed from the movable die 9.

なお、本発明に係わる類似の技術として、射出成形品の離型を良好に行うために回転駒を設けたものは知られている（例えば、特許文献１参照）。
特開平１１−５８４６５号公報 As a similar technique related to the present invention, a technique in which a rotating piece is provided in order to satisfactorily release an injection molded product is known (for example, see Patent Document 1).
JP-A-11-58465

ところで、この従来の成形金型７では、ゲート１８の開口１８ａが樹脂製はすば歯車１の回動軸部２の端面２ｂに相当する箇所、すなわち、回動軸部２の歯部４の近傍に開口１８ａを有する構成であるので、開口１８ａの直近傍に形成されるべき例えば歯４ａ’と各開口１８ａから遠い位置に形成されるべき歯４ａ”とでは、加圧溶融樹脂の到達時間が異なり、回動軸部２の周回り方向についての加圧溶融樹脂の流れの影響が回動軸部２の外周に形成されるべき歯部４の成形精度に直接影響するという問題がある。   By the way, in this conventional molding die 7, the opening 18 a of the gate 18 corresponds to the end surface 2 b of the rotating shaft portion 2 of the resin helical gear 1, that is, the tooth portion 4 of the rotating shaft portion 2. Since the structure has the opening 18a in the vicinity, for example, the tooth 4a ′ to be formed in the immediate vicinity of the opening 18a and the tooth 4a ″ to be formed in a position far from each opening 18a, the arrival time of the pressurized molten resin However, there is a problem that the influence of the flow of the pressurized molten resin in the circumferential direction of the rotation shaft portion 2 directly affects the molding accuracy of the tooth portion 4 to be formed on the outer periphery of the rotation shaft portion 2.

すなわち、ゲート１８の開口１８ａの直近傍に相当する箇所に形成される歯部４の成形精度は確保することができるが、ゲート１８の開口１８ａと開口１８ａとの間に相当する箇所に形成される歯部４では、加圧溶融樹脂の流れが不安定になるために、全体として歯部４の成形精度を確保し難いという不都合がある。   That is, it is possible to ensure the molding accuracy of the tooth portion 4 formed at a location corresponding to the immediate vicinity of the opening 18a of the gate 18, but it is formed at a location corresponding to between the opening 18a and the opening 18a of the gate 18. Since the flow of the pressurized molten resin becomes unstable, there is a disadvantage that it is difficult to ensure the molding accuracy of the tooth portion 4 as a whole.

この問題を解決するために、ディスクゲートを用いて、回動軸部２の中心Ｏに相当する箇所に開口を形成し、中心Ｏから周辺に向かって加圧溶融樹脂を放射状に流すことが考えられる。   In order to solve this problem, it is considered that an opening is formed at a position corresponding to the center O of the rotating shaft portion 2 using a disk gate, and the pressurized molten resin flows radially from the center O toward the periphery. It is done.

このディスクゲートを用いると、回動軸部２の歯部４が形成されべき箇所への到達時間の均等化が図られ、ひいては、加圧溶融樹脂の流れの安定化が図られるので、歯部４の成形精度の確保を図ることができる（なお、ディスクゲートについては、例えば、特開平１０−２４４５４号公報を参照されたい）。   When this disc gate is used, the arrival time of the rotating shaft portion 2 to the portion where the tooth portion 4 is to be formed is equalized, and consequently the flow of the pressurized molten resin is stabilized. 4 can be ensured (refer to, for example, Japanese Patent Laid-Open No. 10-24454 for the disk gate).

ところが、この種のディスクゲートを用いて、歯部４の成形精度の確保を図ることにすると、成形後に回動軸部２の端面２ｂにディスクゲートを設けた分だけ余肉部が生じるために、樹脂製はすば歯車１の回動軸部２の端面２ｂをカットして仕上げなければならないという不都合がある。   However, if this type of disc gate is used to ensure the forming accuracy of the tooth portion 4, an extra portion is generated after forming the disc gate on the end surface 2b of the rotating shaft portion 2. The resin-made helical gear 1 has the disadvantage that the end surface 2b of the rotating shaft portion 2 of the helical gear 1 must be cut and finished.

本発明は、上記の事情に鑑みて為されたもので、その目的とするところは、高精度のヘリカル形状の歯部を有する樹脂製ヘリカル歯車を簡単な構成で成形することのできる成形金型及びこれを用いて成形された樹脂製ヘリカル歯車を提供することにある。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a molding die capable of molding a resin helical gear having a highly accurate helical tooth portion with a simple configuration. And it is providing the resin-made helical gear shape | molded using this.

請求項１に記載の発明は、回動軸部の直径よりも大径の大径部を有しかつ前記回動軸部の外周部にヘリカル形状の歯部が形成されると共に前記大径部の外周部にヘリカル形状の歯部が形成されしかも前記大径部にはその外周部と前記回動軸部との間にウエブが形成されている樹脂製ヘリカル歯車を成形するための成形金型であって、前記回動軸部の形状と前記大径部との形状に対応するキャビティを協働して構成する一対の分割金型からなり、該一対の分割金型は一方の金型に対して他方の金型が相対的に離間する構成とされ、前記一方の金型には前記大径部の外周部に形成された歯部に対応するキャビティを形成するための回転駒が回転可能に設けられ、前記他方の金型には前記回動軸部の外周部に形成された歯部に対応するキャビティを形成するための金型駒が設けられ、前記一方の金型には前記各歯部から遠い箇所に前記キャビティに溶融樹脂を注入するゲートの開口が設けられていることを特徴とする成形金型である。   The invention according to claim 1 has a large-diameter portion having a diameter larger than the diameter of the rotating shaft portion, and a helical tooth portion is formed on an outer peripheral portion of the rotating shaft portion, and the large-diameter portion. A molding die for molding a resin helical gear in which a helical tooth portion is formed on the outer peripheral portion and a web is formed on the large diameter portion between the outer peripheral portion and the rotating shaft portion. And comprising a pair of split molds that cooperate to form a cavity corresponding to the shape of the rotating shaft part and the shape of the large-diameter part, and the pair of split molds is one mold. The other mold is relatively separated from the other mold, and a rotating piece for forming a cavity corresponding to a tooth portion formed on the outer peripheral portion of the large-diameter portion is rotatable in the one mold. The other mold has a cavity corresponding to a tooth portion formed on the outer peripheral portion of the rotating shaft portion. A molding die is provided, wherein the one die is provided with an opening of a gate for injecting molten resin into the cavity at a location far from each tooth portion. It is.

請求項２に記載の発明は、前記ウエブには放射状のリム部が形成されていることを特徴とする請求項２に記載の成形金型である。   A second aspect of the present invention is the molding die according to the second aspect, wherein a radial rim portion is formed on the web.

請求項３に記載の発明は、前記一方の金型が固定型であり、前記他方の金型が可動型であることを特徴とする請求項１又は請求項２に記載の成形金型である。   The invention according to claim 3 is the molding die according to claim 1 or 2, wherein the one mold is a fixed mold and the other mold is a movable mold. .

請求項４に記載の発明は、前記固定型には、前記キャビティに溶融樹脂を注入するゲートの開口が前記放射状のリム部に対応する箇所にその周回り方向に複数個形成されていることを特徴とする請求項３に記載の成形金型である。   According to a fourth aspect of the present invention, in the fixed mold, a plurality of gate openings for injecting molten resin into the cavity are formed in the circumferential direction at locations corresponding to the radial rim portions. It is a shaping die according to claim 3 characterized by things.

請求項５に記載の発明は、前記開口が前記回動軸部を中心にして回転対称位置に形成されていることを特徴とする請求項４に記載の成形金型である。   According to a fifth aspect of the present invention, in the molding die according to the fourth aspect, the opening is formed at a rotationally symmetric position about the rotation shaft portion.

請求項６に記載の発明は、前記可動型には、前記樹脂製ヘリカル歯車を該可動型から離型させるためのイジェクトピンが設けられていることを特徴とする請求項５に記載の成形金型である。   The invention according to claim 6 is characterized in that the movable die is provided with an eject pin for releasing the resin helical gear from the movable die. It is a type.

請求項７に記載の発明は、前記金型駒が固定駒であることを特徴とする請求項６に記載の成形金型である。   The invention according to claim 7 is the molding die according to claim 6, wherein the die piece is a fixed piece.

請求項８に記載の発明は、前記樹脂製ヘリカル歯車が前記可動型の離型時に回転されることを特徴とする請求項６に記載の成形金型である。   The invention according to claim 8 is the molding die according to claim 6, wherein the resin helical gear is rotated when the movable mold is released.

請求項９に記載の発明は、前記可動型には、前記固定型に向かって突出する位置決めピンが形成され、前記回転駒には前記可動型が臨む面の側に前記位置決めピンと協働して前記回転駒の回転方向位置を規定する位置決め穴が形成されていることを特徴とする請求項６に記載の成形金型である。   According to a ninth aspect of the present invention, the movable die is formed with a positioning pin that protrudes toward the fixed die, and the rotary piece cooperates with the positioning pin on the side facing the movable die. The molding die according to claim 6, wherein a positioning hole for defining a rotational direction position of the rotary piece is formed.

請求項１０に記載の発明は、前記回転駒には、前記可動型に向かって突出する位置決めピンが形成され、前記可動型には前記回転駒に臨む面の側に前記位置決めピンと協働して前記回転駒の回転方向位置を規定する位置決め穴が形成されていることを特徴とする請求項６に記載の成形金型である。   According to a tenth aspect of the present invention, a positioning pin that protrudes toward the movable die is formed on the rotary piece, and the movable die cooperates with the positioning pin on the side facing the rotary piece. The molding die according to claim 6, wherein a positioning hole for defining a rotational direction position of the rotary piece is formed.

請求項１１に記載の発明は、前記樹脂製ヘリカル歯車が樹脂製はすば歯車であることを特徴とする請求項１に記載の成形金型である。   The invention according to claim 11 is the molding die according to claim 1, wherein the resin helical gear is a resin helical gear.

請求項１２に記載の発明は、請求項９に記載の成形金型を用いて成形された樹脂製ヘリカル歯車である。   A twelfth aspect of the present invention is a resin helical gear formed by using the molding die according to the ninth aspect.

請求項１ないし請求項６に記載の発明によれば、回動軸部の各歯に相当するキャビティへ加圧溶融樹脂が到達するまでの時間差を相対的に小さくできるので、高精度のヘリカル形状の歯部を有する樹脂製ヘリカル歯車を簡単な構成で成形することができるという効果を奏する。   According to the first to sixth aspects of the present invention, since the time difference until the pressurized molten resin reaches the cavity corresponding to each tooth of the rotating shaft portion can be relatively reduced, a highly accurate helical shape The effect is that the resin helical gear having the tooth portions can be formed with a simple configuration.

特に、請求項５、請求項６に記載の発明によれば、加圧溶融樹脂の各歯部への到達時間の均質化を図ることができるので、より一層高精度のヘリカル形状の歯部を有する樹脂製ヘリカル歯車を簡単な構成で成形することができる。   In particular, according to the inventions according to claims 5 and 6, since it is possible to homogenize the arrival time of the pressurized molten resin to the respective tooth portions, it is possible to further improve the helical tooth portions. The resin helical gear can be formed with a simple configuration.

請求項７、請求項８に記載の発明によれば、樹脂製ヘリカル歯車の可動型からの離型の際に慣性の小さい樹脂製ヘリカル歯車を金型駒に対して相対回転させて離脱させることができるので、離型時の歯の破損防止の向上を図ることができる。   According to the seventh and eighth aspects of the present invention, when the resin helical gear is released from the movable mold, the resin helical gear having a small inertia is rotated relative to the mold piece and separated. Therefore, it is possible to improve the prevention of tooth breakage during mold release.

特に、請求項７に記載の発明によれば、回動軸部の歯部を形成する金型駒を固定駒としたので、量産時の回動軸部の歯部の成形精度のばらつきを抑制することができる。   In particular, according to the seventh aspect of the invention, since the die piece forming the tooth portion of the rotating shaft portion is a fixed piece, variation in molding accuracy of the tooth portion of the rotating shaft portion during mass production is suppressed. can do.

請求項９、請求項１０に記載の発明によれば、大径部の歯部を主として成形する回転駒の回転方向角度位置を成形時毎に規定することができるので、量産時の大径部の歯部の成形精度のばらつきを抑制することができる。   According to the ninth and tenth aspects of the present invention, since the rotational direction angular position of the rotary piece that mainly molds the tooth portion of the large diameter portion can be defined for each molding, the large diameter portion at the time of mass production Variations in the molding accuracy of the teeth can be suppressed.

請求項１２に記載の発明によれば、高精度のヘリカル形状の歯部を有する樹脂製ヘリカル歯車を提供できる。   According to invention of Claim 12, the resin-made helical gear which has a highly accurate helical-shaped tooth part can be provided.

このものについて、日本歯車工業会精度規格で両歯面噛み合い試験を行った結果、従来の樹脂製ヘリカル歯車は、図９（ａ）に示すように、ゲート１８ａ間の１ピッチ噛み合い誤差が１９．６μｍ、全噛み合い誤差が２７．０μｍ程度合ったが、本発明の樹脂製ヘリカル歯車は、図９（ｂ）に示すように、ゲート１８ａ間の１ピッチ噛み合い誤差が３．３μｍ、全噛み合い誤差が６．８μｍ程度となり、いわゆるＪＧＭＡ０級を達成できた。   As a result of performing a both-tooth meshing test on this gear according to the Japan Gear Industry Association accuracy standard, the conventional resin helical gear has a one-pitch meshing error between the gates 18a as shown in FIG. Although the total meshing error is 6 μm and the total meshing error is approximately 27.0 μm, the resin helical gear of the present invention has a one-pitch meshing error between the gates 18a as shown in FIG. It was about 6.8 μm, and the so-called JGMA 0 grade was achieved.

以下に、本発明に係わる樹脂製ヘリカル歯車の成形金型及びこの成形金型を用いて成形された樹脂製ヘリカル歯車の発明の実施の形態を図面を参照しつつ説明する。   DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a resin-made helical gear molding die and a resin-made helical gear molded using the molding die according to the present invention will be described below with reference to the drawings.

図５は本発明に係わる成形金型３０の型締め時の状態を示す図、図６は本発明に係わる成形金型３０による樹脂製ヘリカル歯車としての樹脂製はすば歯車の成形直後の型開き時の状態を示す図、図７は本発明に係わる成形金型３０による樹脂製はすば歯車の離型時の状態を示す図である。   FIG. 5 is a view showing a state when the molding die 30 according to the present invention is clamped, and FIG. 6 is a die immediately after molding of a resin helical gear as a resin helical gear by the molding die 30 according to the present invention. FIG. 7 is a view showing a state at the time of opening, and FIG. 7 is a view showing a state at the time of releasing a resin helical gear by the molding die 30 according to the present invention.

この成形金型３０は図１、図２に示す樹脂製ヘリカル歯車としてのはすば歯車１を形成するのに用いられる。この成形金型３０は一対の分割金型としての固定型３１と可動型３２とから構成されている。この固定型３１と可動型３２とは回動軸部２の形状と大径部３との形状に対応するキャビティ３３’を協働して構成する。   This molding die 30 is used to form a helical gear 1 as a resin helical gear shown in FIGS. The molding die 30 includes a fixed die 31 and a movable die 32 as a pair of split dies. The fixed mold 31 and the movable mold 32 cooperate to form a cavity 33 ′ corresponding to the shape of the rotating shaft portion 2 and the shape of the large diameter portion 3.

可動型３２はイジェクトロッド３２Ａにガイドされて上下方向に可動され、可動型３２は矢印Ｂ１方向に駆動されると、固定型３１から離間する構成とされている。   The movable mold 32 is guided by the eject rod 32A and moved in the vertical direction. The movable mold 32 is configured to be separated from the fixed mold 31 when driven in the direction of the arrow B1.

可動型３２には回動軸部２の外周部に形成された歯部４に対応するキャビティ３５ａを形成するための固定駒としての金型駒３５が設けられている。   The movable die 32 is provided with a die piece 35 as a fixed piece for forming a cavity 35 a corresponding to the tooth portion 4 formed on the outer peripheral portion of the rotating shaft portion 2.

固定型３１には各歯部４、５に対応するキャビティ３３ａ、３５ａから遠い箇所にキャビティ３３’に加圧溶融樹脂を注入するゲート３６の開口３７が複数個設けられている。ここでは、この開口３７はウエブ６が形成されるべき箇所に臨んでおり、この開口３７は回動軸部２の周回り方向回転対称位置に設けられ、その個数は６個とされている。この開口３７は、放射状のリム部３ｄに対応する箇所、すなわち、放射状の各リム部３ｄ間に設けるのがより一層望ましい。   The fixed mold 31 is provided with a plurality of openings 37 of the gate 36 for injecting the pressurized molten resin into the cavities 33 ′ at locations far from the cavities 33 a and 35 a corresponding to the tooth portions 4 and 5. Here, the opening 37 faces a portion where the web 6 is to be formed, and the opening 37 is provided at a rotationally symmetric position in the circumferential direction of the rotating shaft portion 2, and the number thereof is six. It is even more desirable to provide the openings 37 at locations corresponding to the radial rim portions 3d, that is, between the radial rim portions 3d.

また、固定型３１には、主として大径部３に対応するキャビティ３９ａを形成するための金型駒３９と主として貫通穴２ａを形成するための金型駒４０と主としてリム部３ｃを形成するための金型駒４１とが設けられている。更に、この固定型３１には大径部３の外周部に形成された歯部５に対応するキャビティ３３ａを形成するための回転駒３３がボールベアリング３４を介して金型駒３９に対して回転可能に設けられている。   Further, in the fixed die 31, a die piece 39 for mainly forming the cavity 39a corresponding to the large diameter portion 3, a die piece 40 for mainly forming the through hole 2a, and mainly the rim portion 3c are formed. The die piece 41 is provided. Further, a rotating piece 33 for forming a cavity 33 a corresponding to the tooth portion 5 formed on the outer peripheral portion of the large-diameter portion 3 is rotated with respect to the die piece 39 via the ball bearing 34 in the fixed die 31. It is provided as possible.

可動型３２にはその取り付け板４２’に、金型駒３５を貫通して固定型３１に向かって延びるイジェクトピン４２が設けられている。このイジェクトピン４２、イジェクトロッド３２Ａは樹脂製はすば歯車１を可動型３２から離型させる役割を果たす。   The movable die 32 is provided with an eject pin 42 which extends toward the fixed die 31 through the die piece 35 on the mounting plate 42 ′. The eject pin 42 and the eject rod 32 </ b> A serve to release the resin helical gear 1 from the movable mold 32.

その可動型３２には固定型３１に向かって突出する位置決めピン４３が形成されている。回転駒３３には可動型３２が臨む面の側に位置決めピン４３と協働して回転駒３３の回転方向位置を規定する位置決め穴４４が形成されている。   The movable mold 32 is formed with positioning pins 43 that protrude toward the fixed mold 31. A positioning hole 44 that defines the rotational direction position of the rotary piece 33 in cooperation with the positioning pin 43 is formed in the rotary piece 33 on the side facing the movable mold 32.

樹脂製はすば歯車１は、ゲート３６から矢印Ｂ２で示すように加圧溶融樹脂を注入し、加圧溶融樹脂を冷却硬化させて成形する。   The resin helical gear 1 is molded by injecting a pressurized molten resin from the gate 36 as indicated by an arrow B2, and cooling and curing the pressurized molten resin.

次に、固定型３１から離間させる方向（矢印Ｂ１方向）に可動型３２を駆動する。   Next, the movable die 32 is driven in a direction away from the fixed die 31 (in the direction of arrow B1).

すると、樹脂製はすば歯車１の歯部４がヘリカル形状であるので、回転駒３３が樹脂製はすば歯車１の歯部４の歯のピッチ間隔に相当する角度分だけ回動軸部２を中心にして回転され、樹脂製はすば歯車１の回動軸部２に相当する成形部が固定型３１から離脱される。図６は樹脂製はすば歯車１に相当する成形品が固定型３１から離型された状態が示されている。   Then, since the tooth part 4 of the resin helical gear 1 has a helical shape, the rotary piece 33 is rotated by an angle corresponding to the pitch interval of the teeth of the tooth part 4 of the resin helical gear 1. 2, the molded portion corresponding to the rotation shaft portion 2 of the resin helical gear 1 is detached from the fixed die 31. FIG. 6 shows a state in which a molded product corresponding to the resin helical gear 1 is released from the fixed mold 31.

ついで、イジェクトピン４２、４２、イジェクトロッド３２Ａを矢印Ａ３方向に可動する。すると、樹脂製はすば歯車１に相当する成形品それ自体が回動軸部２を中心にしてかつ金型駒３５に対して樹脂製はすば歯車１の歯部４の歯のピッチ間隔に相当する角度分だけ相対的に回転されつつその軸方向に移送され、これにより、図７に示すように、樹脂製はすば歯車１の大径部３が可動型３２から離脱され、樹脂製はすば歯車１が可動型３２から取り外される。   Next, the eject pins 42 and 42 and the eject rod 32A are moved in the direction of the arrow A3. Then, the molded product corresponding to the resin helical gear 1 itself is centered on the rotation shaft portion 2 and the pitch interval of the teeth of the tooth portion 4 of the resin helical gear 1 with respect to the mold piece 35. 7, the large diameter portion 3 of the resin helical gear 1 is detached from the movable mold 32, as shown in FIG. 7. The helical gear 1 is removed from the movable die 32.

次に、再度成形を行うときには、図８に示すように、矢印Ａ４方向に、可動型３２を固定型３１に向けて接近させ、型締めを行う。その際、位置決めピン４３が位置決め穴４４の周壁に衝合し、この位置決めピン４３によって、回転駒３３の回転角度位置が型開き前の回転角度位置に復帰される。   Next, when molding is performed again, as shown in FIG. 8, the movable mold 32 is moved toward the fixed mold 31 in the direction of arrow A <b> 4 to perform mold clamping. At that time, the positioning pin 43 comes into contact with the peripheral wall of the positioning hole 44, and the rotational angle position of the rotary piece 33 is returned to the rotational angle position before the mold opening by the positioning pin 43.

本発明の実施の形態によれば、加圧溶融樹脂の各歯部への到達時間の均質化を図ることができるので、より一層高精度のヘリカル形状の歯部を有する樹脂製ヘリカル歯車１を簡単な構成で成形することができる。   According to the embodiment of the present invention, it is possible to homogenize the arrival time of the pressurized molten resin to each tooth portion, so the resin helical gear 1 having a helical portion having a higher accuracy can be obtained. It can be molded with a simple configuration.

また、樹脂製ヘリカル歯車１の可動型３２からの離型の際に慣性の小さい樹脂製ヘリカル歯車１を金型駒３５に対して相対回転させて離脱させることができるので、離型時の歯の破損防止の向上を図ることができる。   Further, when the resin helical gear 1 is released from the movable die 32, the resin helical gear 1 having a small inertia can be released by rotating relative to the die piece 35. The damage prevention can be improved.

更に、回動軸部２の歯部４を形成する金型駒３５を固定駒としたので、量産時の回動軸部２の歯部４の成形精度のばらつきを抑制することができる。   Furthermore, since the die piece 35 forming the tooth portion 4 of the rotating shaft portion 2 is a fixed piece, variation in molding accuracy of the tooth portion 4 of the rotating shaft portion 2 during mass production can be suppressed.

以上、発明の実施の形態では、可動型３２に固定型３１に向かって突出する位置決めピン４３を形成し、回転駒３３に可動型３１が臨む面の側に位置決めピン４３と協働して回転駒３３の回転方向位置を規定する位置決め穴４４を形成したが、可動型３２に向かって突出する位置決めピンを回転駒３３に形成し、可動型３２に回転駒３３に臨む面の側に位置決めピンと協働して回転駒３３の回転方向位置を規定する位置決め穴を形成することもできる。   As described above, in the embodiment of the present invention, the positioning pin 43 that protrudes toward the fixed die 31 is formed on the movable die 32, and rotates in cooperation with the positioning pin 43 on the side of the rotary piece 33 facing the movable die 31. Although the positioning hole 44 for defining the rotational position of the piece 33 is formed, a positioning pin that protrudes toward the movable mold 32 is formed in the rotary piece 33, and the positioning pin and the positioning pin are arranged on the side of the surface facing the rotary piece 33. It is also possible to form a positioning hole that defines the rotational direction position of the rotary piece 33 in cooperation.

従来の樹脂製はすば歯車の縦断面図である。It is a longitudinal cross-sectional view of the conventional resin helical gear. 従来の樹脂製はすば歯車の斜視図であって、（ａ）は図１に示す樹脂製はすば歯車を一端部側から見た斜視図、（ｂ）は図１に示す樹脂製はすば歯車を他端部側から見た斜視図である。It is the perspective view of the conventional resin helical gear, Comprising: (a) is the perspective view which looked at the resin helical gear shown in FIG. 1 from the one end part side, (b) is the resin made in FIG. It is the perspective view which looked at the helical gear from the other end side. 従来の成形金型の型締め時の状態を示す断面図である。It is sectional drawing which shows the state at the time of the mold clamping of the conventional molding die. 図１に示す樹脂製はすば歯車を一端面側から見た平面図である。It is the top view which looked at the resin-made helical gears shown in FIG. 1 from the one end surface side. 本発明に係わる成形金型の型締め時の状態を示す断面図である。It is sectional drawing which shows the state at the time of the mold clamping of the shaping die concerning this invention. 本発明に係わる成形金型による樹脂製はすば歯車の成形直後の型開き時の状態を示す断面図である。It is sectional drawing which shows the state at the time of the mold opening immediately after shaping | molding of the resin helical gears by the shaping die concerning this invention. 本発明に係わる成形金型による樹脂製はすば歯車の離型時の状態を示す断面図である。It is sectional drawing which shows the state at the time of mold release of the resin helical gears by the shaping die concerning this invention. 本発明に成形金型の型締め直前状態を示す断面図である。It is sectional drawing which shows the state just before the mold clamping of the shaping die in this invention. 従来の樹脂製はすば歯車の歯の精度試験を比較して説明する説明図であって、（ａ）は従来の樹脂製はすば歯車の歯の噛み合い精度を説明するための説明図、（ｂ）は本発明に係わる樹脂製はすば歯車の歯の噛み合い精度を説明するための説明図である。It is explanatory drawing which compares and demonstrates the accuracy test of the conventional resin helical gear tooth | gear, (a) is explanatory drawing for demonstrating the meshing accuracy of the tooth | gear of the conventional resin helical gear, (B) is explanatory drawing for demonstrating the meshing | engagement precision of the tooth | gear of the resin helical gear concerning this invention.

符号の説明Explanation of symbols

３０…成形型
３１…固定型
３２…可動型
３３…回転駒
３５…金型駒（固定駒）
３３’…キャビティ
３６…ゲート
３７…開口 30 ... Mold 31 ... Fixed mold 32 ... Movable mold 33 ... Rotating piece 35 ... Mold piece (fixed piece)
33 '... cavity 36 ... gate 37 ... opening

Claims (12)

回動軸部の直径よりも大径の大径部を有しかつ前記回動軸部の外周部にヘリカル形状の歯部が形成されると共に前記大径部の外周部にヘリカル形状の歯部が形成されしかも前記大径部にはその外周部と前記回動軸部との間にウエブが形成されている樹脂製ヘリカル歯車を成形するための成形金型であって、前記回動軸部の形状と前記大径部との形状に対応するキャビティを協働して構成する一対の分割金型からなり、該一対の分割金型は一方の金型に対して他方の金型が相対的に離間する構成とされ、前記一方の金型には前記大径部の外周部に形成された歯部に対応するキャビティを形成するための回転駒が回転可能に設けられ、前記他方の金型には前記回動軸部の外周部に形成された歯部に対応するキャビティを形成するための金型駒が設けられ、前記一方の金型には前記各歯部から遠い箇所に前記キャビティに溶融樹脂を注入するゲートの開口が設けられていることを特徴とする成形金型。   A helical tooth portion is formed on the outer peripheral portion of the large-diameter portion and has a helical tooth portion formed on the outer peripheral portion of the rotary shaft portion. And a molding die for molding a resin helical gear in which a web is formed between the outer peripheral portion of the large diameter portion and the rotating shaft portion, and the rotating shaft portion And a pair of split molds that cooperate with each other to form a cavity corresponding to the shape of the large-diameter portion, and the pair of split molds is relative to one mold and the other mold. The one mold is rotatably provided with a rotating piece for forming a cavity corresponding to a tooth portion formed on the outer peripheral part of the large diameter part, and the other mold Is provided with a die piece for forming a cavity corresponding to the tooth portion formed on the outer peripheral portion of the rotating shaft portion. Is, molding die, wherein the one of the mold, characterized in that the opening of the gate for injecting the molten resin the in the cavity far locations from the respective tooth portions are provided. 前記ウエブには放射状のリム部が形成されていることを特徴とする請求項２に記載の成形金型。   The molding die according to claim 2, wherein a radial rim portion is formed on the web. 前記一方の金型が固定型であり、前記他方の金型が可動型であることを特徴とする請求項１又は請求項２に記載の成形金型。   The molding die according to claim 1 or 2, wherein the one mold is a fixed mold and the other mold is a movable mold. 前記固定型には、前記キャビティに溶融樹脂を注入するゲートの開口が前記放射状のリム部に対応する箇所にその周回り方向に複数個形成されていることを特徴とする請求項３に記載の成形金型。   4. The fixed mold according to claim 3, wherein a plurality of gate openings for injecting molten resin into the cavity are formed in a circumferential direction at locations corresponding to the radial rim portions. 5. Molding mold. 前記開口が前記回動軸部を中心にして回転対称位置に形成されていることを特徴とする請求項４に記載の成形金型。   The molding die according to claim 4, wherein the opening is formed at a rotationally symmetric position about the rotation shaft portion. 前記可動型には、前記樹脂製ヘリカル歯車を該可動型から離型させるためのイジェクトピンが設けられていることを特徴とする請求項５に記載の成形金型。   The molding die according to claim 5, wherein the movable die is provided with an eject pin for releasing the resin helical gear from the movable die. 前記金型駒が固定駒であることを特徴とする請求項６に記載の成形金型。   The molding die according to claim 6, wherein the die piece is a fixed piece. 前記樹脂製ヘリカル歯車が前記可動型の離型時に回転されることを特徴とする請求項６に記載の成形金型。   The molding die according to claim 6, wherein the resin helical gear is rotated when the movable mold is released. 前記可動型には、前記固定型に向かって突出する位置決めピンが形成され、前記回転駒には前記可動型が臨む面の側に前記位置決めピンと協働して前記回転駒の回転方向位置を規定する位置決め穴が形成されていることを特徴とする請求項６に記載の成形金型。   The movable die is formed with a positioning pin that protrudes toward the fixed die, and the rotary piece defines the rotational direction position of the rotary piece in cooperation with the positioning pin on the side facing the movable die. The molding die according to claim 6, wherein a positioning hole is formed. 前記回転駒には、前記可動型に向かって突出する位置決めピンが形成され、前記可動型には前記回転駒に臨む面の側に前記位置決めピンと協働して前記回転駒の回転方向位置を規定する位置決め穴が形成されていることを特徴とする請求項６に記載の成形金型。   The rotating piece is formed with a positioning pin that protrudes toward the movable die, and the movable die defines the rotational direction position of the rotating piece in cooperation with the positioning pin on the side facing the rotary piece. The molding die according to claim 6, wherein a positioning hole is formed. 前記樹脂製ヘリカル歯車が樹脂製はすば歯車であることを特徴とする請求項１に記載の成形金型。   The molding die according to claim 1, wherein the resin helical gear is a resin helical gear. 請求項９に記載の成形金型を用いて成形された樹脂製ヘリカル歯車。   A resin-made helical gear molded using the molding die according to claim 9.
JP2007064725A 2007-03-14 2007-03-14 Resin Helical Gear Mold and Resin Helical Gear Molded Using the Mold Expired - Fee Related JP4846631B2 (en)

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