JPH11156886A - Manufacture of resin gear, and resin gear - Google Patents
Manufacture of resin gear, and resin gearInfo
- Publication number
- JPH11156886A JPH11156886A JP32919997A JP32919997A JPH11156886A JP H11156886 A JPH11156886 A JP H11156886A JP 32919997 A JP32919997 A JP 32919997A JP 32919997 A JP32919997 A JP 32919997A JP H11156886 A JPH11156886 A JP H11156886A
- Authority
- JP
- Japan
- Prior art keywords
- disc
- resin gear
- disk
- resin
- gear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Gears, Cams (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はディスク部の外周に
歯部を備えた樹脂ギヤの製造方法及び樹脂ギヤに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a resin gear having teeth on the outer periphery of a disk portion and a resin gear.
【０００２】[0002]
【従来の技術】図９（ａ），（ｂ）は従来の代表的な樹
脂ギヤ（はすば歯車）の作動説明図であり、（ａ）は側
面図を示し、（ｂ）は樹脂ギヤ同士が噛み合った状態の
断面図を示す。（ａ）において、樹脂ギヤ１００のはす
ば１０１…（…は複数個を示す。以下同様。）に歯車の
回転力Ｆがかかると、回転軸１０３に平行なスラストＦ
１（Ｆ１＝Ｆｓｉｎθ）が働く。2. Description of the Related Art FIGS. 9 (a) and 9 (b) are diagrams for explaining the operation of a conventional typical resin gear (helical gear), FIG. 9 (a) is a side view, and FIG. FIG. 3 shows a cross-sectional view of a state where the members are engaged with each other. In (a), when the rotational force F of the gear is applied to the helical 101 of the resin gear 100 (... denotes a plurality, the same applies hereinafter), the thrust F parallel to the rotating shaft 103 is applied.
1 (F1 = Fsin θ) works.
【０００３】（ｂ）において、上段の樹脂ギヤ１００を
矢印の如く回転すると、上段の樹脂ギヤ１００から下段
の樹脂ギヤ１０５に回転力が伝わる。上下の樹脂ギヤ１
００，１０５にスラストＦ１，Ｆ１が矢印の如く働い
て、各々の薄肉ディスク部１００ａ，１０５ａが湾曲状
に歪む。このため、上下の樹脂ギヤ１００，１０５の噛
合いがズレて騒音が発生する虞れがある。騒音を解消す
るためには、樹脂ギヤのディスク部を厚肉にして、スラ
ストでディスク部が歪まないようにする必要がある。次
図に厚肉ディスクを備えた樹脂ギヤを示す。In (b), when the upper resin gear 100 is rotated as shown by an arrow, a rotational force is transmitted from the upper resin gear 100 to the lower resin gear 105. Upper and lower resin gear 1
Thrusts F1 and F1 act on 00 and 105 as indicated by arrows, and the thin disk portions 100a and 105a are distorted in a curved shape. Therefore, there is a possibility that the mesh between the upper and lower resin gears 100 and 105 is displaced and noise is generated. In order to eliminate noise, it is necessary to increase the thickness of the disk portion of the resin gear so that the disk portion is not distorted by thrust. The following figure shows a resin gear with a thick disk.
【０００４】図１０は従来の代表的な厚肉ディスク部の
樹脂ギヤの断面図である。樹脂ギヤ１０６のディスク部
１０７を厚肉にしたので、樹脂ギヤ１０６にスラストが
働いてもディスク部１０７が歪む虞れはない。この結
果、樹脂ギヤの噛合いがズレないので騒音が発生する心
配はない。FIG. 10 is a sectional view of a conventional resin gear of a typical thick disk portion. Since the disk portion 107 of the resin gear 106 is made thick, there is no fear that the disk portion 107 is distorted even if thrust acts on the resin gear 106. As a result, there is no risk of noise being generated because the meshing of the resin gears is not displaced.
【０００５】しかし、ディスク部１０７を厚肉にしたの
で、樹脂ギヤ１０６の製造時に、厚肉ディスク部１０７
の凝固による収縮で歯部１０８にヒケ１０８ａが発生
し、歯面１０８ｂの精度が悪くなり騒音が発生する虞れ
がある。このため、ディスク部１０７を安易に厚肉化す
ることはできない。However, since the disk portion 107 is made thicker, the thicker disk portion 107 is required when the resin gear 106 is manufactured.
The shrinkage due to the coagulation causes sink marks 108a in the tooth portion 108, and the accuracy of the tooth surface 108b may be deteriorated, which may cause noise. Therefore, the thickness of the disk portion 107 cannot be easily increased.
【０００６】一方、厚肉ディスク部を備えた樹脂ギヤと
して、例えば特公平７−２２９４２号公報「合成樹脂製
歯車」が提案されている。この技術は、同公報の第２図
に示されるとおり、先ずボスの一部１（番号は公報に記
載されたものを引用した。以下同じ。）、板状アーム部
２及びリムの一部３からなる一次成形品部Ａを一次成形
し、次にボスの残部５、リムの残部６及び歯形部７から
なる二次成形品部Ｂを二次成形したものである。On the other hand, as a resin gear provided with a thick disk portion, for example, Japanese Patent Publication No. Hei 7-22942, "Synthetic resin gear" has been proposed. In this technique, as shown in FIG. 2 of the publication, first, a part 1 of a boss (the numbers are quoted from those described in the publication; the same applies hereinafter), a plate-like arm 2 and a part 3 of a rim. Is formed by primary molding, and then a secondary molded part B composed of the remaining portion 5 of the boss, the remaining portion 6 of the rim, and the tooth shape portion 7 is formed by secondary forming.
【０００７】[0007]
【発明が解決しようとする課題】上記技術によれば、同
公報の第１図に示されるとおり、一次成形品部Ａの厚肉
部に貫通孔４…（…は複数個を示す。以下同様。）を放
射状に設け、これら貫通孔４…を通して樹脂を歯形部７
のキャビティに射出するので、貫通孔４…の出口近傍に
は、樹脂が比較的速く到達するが、貫通孔４…から離れ
た位置には樹脂が遅れて到達する。このため、歯形部７
の歯面を精度よく成形することが難しい。そこで、本発
明の目的は、歯部を精度よく成形し、ディスク部の剛性
を高め、かつ防音効果を高めることにある。According to the above technique, as shown in FIG. 1 of the publication, a plurality of through holes 4 (... ) Are provided radially, and the resin is supplied through the through holes 4.
, The resin relatively quickly reaches the exits of the through holes 4..., But arrives at a position distant from the through holes 4. For this reason, the tooth profile 7
It is difficult to accurately form the tooth surface of the tire. Therefore, an object of the present invention is to form a tooth portion with high precision, increase the rigidity of a disk portion, and enhance the soundproofing effect.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に請求項１は、ディスク部の外周にディスク部より幅広
の歯部を備えた成形品を予め成形する工程と、この成形
品のディスク部に補強リブ又は補強ディスクを添加する
工程とからなることを特徴とする。In order to achieve the above object, a first aspect of the present invention is to pre-mold a molded article having teeth wider than the disk section on the outer periphery of the disk section, Adding a reinforcing rib or a reinforcing disk to the portion.
【０００９】ディスク部の外周にディスク部より幅広の
歯部を備えた成形品を予め成形した後、この成形品のデ
ィスク部に補強リブ又は補強ディスクを添加するので、
補強リブ又は補強ディスクが凝固の際に収縮しても、こ
の補強リブ又は補強ディスクの収縮は歯部に影響しな
い。このため、樹脂ギヤの歯部にヒケが発生する心配が
ないので歯面の精度が向上する。また、ディスク部のキ
ャビティから歯部のキャビティに均一に樹脂を流し込む
ことができるので、上記特公平７−２２９４２号公報の
不具合を解消して歯部の歯面を精度よく成形することが
できる。After a molded article having teeth wider than the disk is formed in advance on the outer periphery of the disk, a reinforcing rib or a reinforcing disk is added to the disk of the molded article.
Even if the reinforcing ribs or disks contract during solidification, the contraction of the reinforcing ribs or disks does not affect the teeth. For this reason, there is no fear of sink marks occurring at the teeth of the resin gear, and the accuracy of the tooth surface is improved. In addition, since the resin can be uniformly poured from the cavity of the disk portion into the cavity of the tooth portion, the problem of Japanese Patent Publication No. Hei 7-22942 can be solved, and the tooth surface of the tooth portion can be accurately formed.
【００１０】請求項２は、ディスク部の外周にディスク
部より幅広の歯部を備えた樹脂ギヤにおいて、ディスク
部に補強リブ又は補強ディスクを備えたことを特徴とす
る。ディスク部に補強リブ又は補強ディスクを備えたの
で、樹脂ギヤに種々の力（一例としてスラスト）が働い
てもディスク部が歪む心配はない。樹脂ギヤの噛合いが
ズレないので、騒音が発生する心配はない。According to a second aspect of the present invention, in a resin gear having a tooth portion wider than the disk portion on the outer periphery of the disk portion, the disk portion is provided with a reinforcing rib or a reinforcing disk. Since the disk portion is provided with the reinforcing rib or the reinforcing disk, there is no fear that the disk portion is distorted even if various forces (for example, thrust) act on the resin gear. Since the meshing of the resin gears is not displaced, there is no fear of generating noise.
【００１１】[0011]
【発明の実施の形態】本発明の実施の形態を添付図に基
づいて以下に説明する。なお、図面は符号の向きに見る
ものとする。図１は本発明に係る樹脂ギヤの斜視図であ
る。樹脂ギヤ１は、合成樹脂製のはすば歯車であって、
中央に取付孔２を開けたディスク部３と、このディスク
部３の外周に備えた歯部（はすば）５と、ディスク部３
に添加した補強リブ７…及びボス８とからなり、ディス
ク部３及び歯部５は成形品（一次成形品）６を構成する
部材である。補強リブ７…は、基端７ａ…がボス８に接
続し、このボス８から半径方向外向きに放射状に延ばし
て先端７ｂ…が歯部５の内周面５ａに接続したものであ
る。取付孔２は回転軸（図示しない）を取付けるための
孔である。Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a perspective view of a resin gear according to the present invention. The resin gear 1 is a helical gear made of synthetic resin,
A disk portion 3 having a mounting hole 2 in the center, a tooth portion (helical) 5 provided on the outer periphery of the disk portion 3, and a disk portion 3
And the boss 8 are added to the disk 3. The disk portion 3 and the tooth portion 5 are members constituting a molded product (primary molded product) 6. The reinforcing ribs 7 have base ends 7a connected to the boss 8, extend radially outward from the boss 8, and have distal ends 7b connected to the inner peripheral surface 5a of the tooth portion 5. The mounting hole 2 is a hole for mounting a rotating shaft (not shown).
【００１２】図２は図１の２−２線断面図であり、ディ
スク部３及びディスク部３の外周に備えた歯部５からな
る一次成形品６と、この一次成形品６のディスク部３に
備えた補強リブ７…及びボス８からなる二次成形品９と
を示す。補強リブ７…は、十分な強度を得るために、デ
ィスク部３より厚肉に成形する。ディスク部３に補強リ
ブ７…を備えたので、樹脂ギヤ１に種々の力（一例とし
てスラスト）が働いてもディスク部３が歪む心配はな
い。このため、樹脂ギヤの噛合いがズレないので、騒音
が発生する心配はない。FIG. 2 is a sectional view taken along the line 2-2 of FIG. 1, and shows a primary molded product 6 comprising a disk portion 3 and teeth 5 provided on the outer periphery of the disk portion 3, and a disk portion 3 of the primary molded product 6. And a secondary molded product 9 comprising a boss 8 and reinforcing ribs 7. The reinforcing ribs 7 are formed thicker than the disk portion 3 in order to obtain sufficient strength. Since the disk portion 3 is provided with the reinforcing ribs 7, there is no fear that the disk portion 3 is distorted even if various forces (for example, thrust) act on the resin gear 1. For this reason, there is no displacement of the meshing of the resin gears, and there is no fear of generating noise.
【００１３】補強リブ７…を備えることによりディスク
部３の肉厚ｔを、例えば１ｍｍ以下と薄く設定できるの
で、ヒケのない歯部５を得ることができる。さらに、デ
ィスク部３のキャビティの全周から歯部５のキャビティ
に溶融樹脂を均一に流し込むことができるので、歯部５
の歯面５ｂを精度よく成形することができる。このた
め、樹脂ギヤが平歯車の場合、たたかれ音の発生を防止
して防音効果を高めることができる。The provision of the reinforcing ribs 7 allows the thickness t of the disk portion 3 to be set as thin as, for example, 1 mm or less, so that the tooth portion 5 without sink marks can be obtained. Further, since the molten resin can be uniformly poured into the cavity of the tooth portion 5 from the entire circumference of the cavity of the disk portion 3, the tooth portion 5
Can be accurately formed. For this reason, when the resin gear is a spur gear, it is possible to prevent the generation of a rattling sound and enhance the soundproofing effect.
【００１４】また、樹脂ギヤ１のディスク部３を歯部５
の内周面５ａに垂直に設定したので、一次成形品６を射
出成形するときに、ディスク部３のキャビティから歯部
５のキャビティの上下方向に溶融樹脂を均一に流れ込む
ことができる。この結果、歯部５の歯面５ｂをさらに精
度よく成形することができる。Further, the disk portion 3 of the resin gear 1 is
Is set perpendicular to the inner peripheral surface 5a of the base member, so that the molten resin can flow uniformly from the cavity of the disk portion 3 into the vertical direction of the cavity of the tooth portion 5 when the primary molded product 6 is injection-molded. As a result, the tooth surface 5b of the tooth portion 5 can be formed with higher accuracy.
【００１５】図３は本発明に係る樹脂ギヤ製造用金型
（第１上型）の断面図である。樹脂ギヤ製造用金型１０
は、固定型としての第１上型１１と、この第１上型１１
の下方に昇降可能に配置した第１中間型１２と、この第
１中間型１２の下方に昇降可能に配置した可動型として
の下型１４と、下型１４にセットしたリング歯型１５
と、これら第１中間型１２、下型１４及びリング歯型１
５で形成したキャビティ１６と、キャビティ１６から樹
脂ギヤ１（図１に示す）を突上げる押出機構２０とから
なる。２１はノズルである。以下、各構成要素を詳しく
説明する。FIG. 3 is a sectional view of a resin gear manufacturing mold (first upper mold) according to the present invention. Mold 10 for resin gear manufacturing
Is a first upper die 11 as a fixed die, and the first upper die 11
A first intermediate mold 12 disposed below the first intermediate mold 12, a movable lower mold 14 disposed below the first intermediate mold 12 as a movable mold, and a ring tooth mold 15 set on the lower mold 14.
And the first intermediate mold 12, the lower mold 14, and the ring tooth mold 1
5 and a pushing mechanism 20 for pushing up the resin gear 1 (shown in FIG. 1) from the cavity 16. 21 is a nozzle. Hereinafter, each component will be described in detail.
【００１６】第１上型１１は、ノズル受入口２２ａが開
いた取付板２２と、取付板２２の下面に取付けた上型板
２３と、上型板２３の収納部２３ａに配置したランナス
トリッパプレート２４と、このランナストリッパプレー
ト２４に載せたスプルーブシュ２５とからなる。第１中
間型１２は、収納部１２ａにランナブロック２６を配置
したものである。ランナブロック２６はランナ２７…を
備え、ランナ２７…は、上端をスプルーブシュ２５の通
路２５ａにつなぎ、かつ終端のランナ２７ａ…をキャビ
ティ１６に臨ませたものである。キャビティ１６は、図
１に示す樹脂ギヤ１の一次成形品６（ディスク部３及び
歯部５）を成形する空間である。なお、ランナ２７…
は、ヒータで加熱するホットランナ方式としてもよい。The first upper die 11 includes a mounting plate 22 having an open nozzle receiving port 22a, an upper die plate 23 mounted on the lower surface of the mounting plate 22, and a runner stripper plate disposed in a storage portion 23a of the upper die plate 23. 24 and a sprue bush 25 placed on the runner stripper plate 24. The first intermediate mold 12 is one in which a runner block 26 is disposed in the storage section 12a. The runner block 26 includes runners 27. The runners 27 are connected at their upper ends to the passages 25 a of the sprue bushes 25, and have the end runners 27 a facing the cavity 16. The cavity 16 is a space for molding the primary molded product 6 (the disc portion 3 and the tooth portion 5) of the resin gear 1 shown in FIG. In addition, runner 27 ...
May be a hot runner method of heating with a heater.
【００１７】押出機構２０は、昇降可能なピストンロッ
ド３０と、ピストンロッド３０の上端に取付け且つ収納
部３１に配置した上下のエジェクタプレート３２，３３
と、上下のエジェクタプレート３２，３３に取付けたエ
ジェクタピン３４…及びガイドロッド３５とからなり、
エジェクタピン３４…を上昇させることで樹脂ギヤ（図
１に示す）１をキャビティ１６から突上げるものであ
る。３７はリング歯型１５を押えるバックアップ部材、
３８…はリング歯型１５を回転させる回転機構（例え
ば、ベアリングや通常の球体）、３９，３９は冷却水の
通路である。The push-out mechanism 20 includes a vertically movable piston rod 30 and upper and lower ejector plates 32 and 33 attached to the upper end of the piston rod 30 and arranged in a storage section 31.
And ejector pins 34 attached to upper and lower ejector plates 32, 33 and a guide rod 35,
The resin gear (shown in FIG. 1) 1 is pushed up from the cavity 16 by raising the ejector pins 34. 37 is a backup member that holds down the ring tooth form 15,
Reference numeral 38 denotes a rotation mechanism (for example, a bearing or a normal sphere) for rotating the ring tooth form 15, and reference numerals 39, 39 denote passages for cooling water.
【００１８】図４は本発明に係る第２上型の断面図であ
り、樹脂ギヤ製造用金型１０の下型１４を第２中間型４
１に型合せした状態を示す。第２上型４０は、図３に示
す第１上型１１と同様に固定型であって、ノズル４４の
受入口４２ａが開いた取付板４２と、取付板４２の下面
に取付けた型板４３と、型板４３の収納部４３ａに配置
したランナストリッパプレート４６と、このランナスト
リッパプレート４６に載せたスプルーブシュ４７とから
なる。FIG. 4 is a sectional view of a second upper mold according to the present invention.
1 shows a state where the molds are matched. The second upper mold 40 is a fixed mold similarly to the first upper mold 11 shown in FIG. 3, and includes a mounting plate 42 having an opening 42 a of a nozzle 44 opened, and a mold plate 43 mounted on the lower surface of the mounting plate 42. And a runner stripper plate 46 disposed in the storage portion 43 a of the template 43, and a sprue bush 47 placed on the runner stripper plate 46.
【００１９】第１中間型４１は、収納部４１ａにランナ
ブロック４８を配置したものである。ランナブロック４
８はランナ５０…を備え、ランナ５０…は、上端をスプ
ルーブシュ４７の通路４７ａにつなぎ、かつ終端のゲー
ト５０ａ…をキャビティ５１（後述する）に臨ませたも
のである。この第１中間型４１は、一次成形品６を備え
た下型１４と型合せすることによりキャビティ５１を形
成する。キャビティ５１は、図１に示す二次成形品９
（補強リブ７…及びボス８）を成形する空間である。The first intermediate mold 41 has a runner block 48 arranged in a storage section 41a. Runner block 4
8 has runners 50. The runners 50 have their upper ends connected to the passage 47a of the sprue bush 47, and have the end gates 50a facing the cavity 51 (described later). The first intermediate mold 41 forms a cavity 51 by being matched with the lower mold 14 having the primary molded product 6. The cavity 51 is provided with the secondary molded product 9 shown in FIG.
(Reinforcing ribs 7 and bosses 8).
【００２０】以上に述べた本発明に係る樹脂ギヤの製造
方法を次に説明する。図５（ａ）〜（ｂ）は本発明に係
る樹脂ギヤの製造方法の第１説明図であり、ロータテー
ブルタイプの２色成形機を使用した方法を説明する。
（ａ）において、ノズル２１から第１中間型１２のラン
ナ２７に矢印，の如く溶融樹脂を射出する。溶融樹
脂は矢印，の如く流れてゲート２７ａ…からキャビ
ティ１６に進入する。キャビティ１６で一次成形品６
（ディスク部及び歯部）を成形した後、下型１４を矢印
，の如く型開きする。（ｂ）において、ロータテー
ブル５３を矢印の如く時計回り方向に１８０゜回転し
て、一次成形品６を成形した下型１４を第２中間型４１
の下方まで移動する。Next, a method of manufacturing the above-described resin gear according to the present invention will be described. 5 (a) and 5 (b) are first explanatory views of the method for manufacturing a resin gear according to the present invention, and explain a method using a rotor table type two-color molding machine.
3A, the molten resin is injected from the nozzle 21 to the runner 27 of the first intermediate mold 12 as indicated by an arrow. The molten resin flows as indicated by the arrow and enters the cavity 16 through the gates 27a. Primary molding 6 in cavity 16
After molding (the disk portion and the tooth portion), the lower mold 14 is opened as indicated by an arrow. In (b), the rotor table 53 is rotated clockwise by 180 ° as indicated by an arrow, and the lower mold 14 on which the primary molded product 6 is molded is moved to the second intermediate mold 41.
To the bottom.
【００２１】図６（ａ）〜（ｂ）は本発明に係る樹脂ギ
ヤの製造方法の第２説明図である。（ａ）において、下
型１４を矢印，の如く上昇して第２中間型４１に型
合せする。（ｂ）において、ノズル４４から第２中間型
４１のランナ５０…に矢印，の如く溶融樹脂を射出
する。溶融樹脂は矢印，の如く流れてゲート５０ａ
…からキャビティ５１に進入する。キャビティ５１で二
次成形品９（補強リブ及びボス）を成形する。下型１４
を矢印，の如く型開きした後、押出機構２０でキャ
ビティ５１から樹脂ギヤ１を突上げる。FIGS. 6A and 6B are second explanatory views of the method for manufacturing a resin gear according to the present invention. In (a), the lower mold 14 is raised as indicated by an arrow and matched with the second intermediate mold 41. In (b), the molten resin is injected from the nozzle 44 to the runners 50 of the second intermediate mold 41 as indicated by arrows. The molten resin flows as shown by the arrow, and the gate 50a
... enter the cavity 51. The secondary molded article 9 (reinforcement rib and boss) is molded in the cavity 51. Lower mold 14
After the mold is opened as shown by an arrow, the resin gear 1 is pushed up from the cavity 51 by the extrusion mechanism 20.
【００２２】一次成形品６（ディスク部及び歯部）を予
め成形した後、一次成形品６のディスク部３に二次成形
品９（補強リブ及びボス）を添加するので、二次成形品
９が凝固の際に収縮しても、この二次成形品９の収縮は
一次成形品６の歯部に影響しない。このため、一次成形
品６の歯部にヒケが発生しないので、精度のよい樹脂ギ
ヤ１（図１に示す）を製造することができる。樹脂ギヤ
１の歯面の精度が向上するので、樹脂ギヤ１が平歯車の
ときには、たたかれ音の発生を防止して防音効果を高め
ることができる。After the primary molded product 6 (disk portion and tooth portion) is formed in advance, the secondary molded product 9 (reinforcement rib and boss) is added to the disk portion 3 of the primary molded product 6. Even if is shrunk during solidification, the shrinkage of the secondary molded product 9 does not affect the teeth of the primary molded product 6. For this reason, since no sink marks occur at the teeth of the primary molded product 6, it is possible to manufacture the resin gear 1 (shown in FIG. 1) with high accuracy. Since the precision of the tooth surface of the resin gear 1 is improved, when the resin gear 1 is a spur gear, it is possible to prevent the generation of a tapping sound and enhance the soundproofing effect.
【００２３】図７は本発明に係るスライドテーブルタイ
プの２色成形機を示した側面図である。２色成形機は、
第１の上型１１及び中間型１２と、第２の上型４０及び
中間型４１と、第１中間型１２の下方に配置した下型１
４と、下型を取付けたスライドテーブル５４とからな
り、先ず第１上型１１、第１中間型１２及び下型１４で
一次成形し、次にスライドテーブル５４を矢印方向に移
動して下型１４を第２中間型４１の下方に位置決めし、
次いで下型１４を上昇して第２中間型４１に型合せし、
この状態で二次成形品９を添加する装置である。スライ
ドテーブルタイプの２色成形機によれば、ロータテーブ
ルタイプの２色成形機と同様に樹脂ギヤ１を成形するこ
とができる。FIG. 7 is a side view showing a slide table type two-color molding machine according to the present invention. The two-color molding machine
A first upper mold 11 and an intermediate mold 12, a second upper mold 40 and an intermediate mold 41, and a lower mold 1 disposed below the first intermediate mold 12;
4 and a slide table 54 to which a lower die is attached. First, the first upper die 11, the first intermediate die 12, and the lower die 14 are used for primary molding, and then the slide table 54 is moved in the direction of an arrow to lower the lower die. 14 is positioned below the second intermediate mold 41,
Next, the lower mold 14 is raised to match the second intermediate mold 41,
This is an apparatus for adding the secondary molded article 9 in this state. According to the slide table type two-color molding machine, the resin gear 1 can be molded in the same manner as the rotor table type two-color molding machine.
【００２４】第２実施例について説明する。図８は本発
明に係る樹脂ギヤ（第２実施例）の斜視図であり、第１
実施例と同一部材については同一符号を付して説明を省
略する。樹脂ギヤ５５は一次成形品６のディスク部３
に、厚肉の補強ディスク５６（二次成形品）を添加した
ギヤである。A second embodiment will be described. FIG. 8 is a perspective view of a resin gear (second embodiment) according to the present invention, and FIG.
The same members as those in the embodiment are denoted by the same reference numerals, and description thereof will be omitted. The resin gear 55 is the disk part 3 of the primary molded product 6.
Is a gear to which a thick reinforcing disk 56 (secondary molded product) is added.
【００２５】ディスク部３に補強ディスク５６を備えた
ので、樹脂ギヤ５５に種々の力（一例としてスラスト）
が働いてもディスク部３が歪む心配はない。このため、
樹脂ギヤの噛合いがズレないので、騒音が発生する心配
はない。また、補強ディスク５６を二次成形することに
より、補強ディスク５６が凝固する際に収縮しても、補
強ディスク５６の収縮は一次成形品６の歯部に影響しな
い。このため、一次成形品６の歯部５をヒケのない状態
に成形することができるので、精度のよい樹脂ギヤ５５
を製造することができる。Since the disk portion 3 is provided with the reinforcing disk 56, various forces (for example, thrust) are applied to the resin gear 55.
There is no fear that the disk section 3 will be distorted even if. For this reason,
Since the meshing of the resin gears is not displaced, there is no fear of generating noise. In addition, by forming the reinforcing disk 56 in a secondary shape, even if the reinforcing disk 56 contracts when it solidifies, the contraction of the reinforcing disk 56 does not affect the teeth of the primary molded product 6. For this reason, since the tooth portion 5 of the primary molded product 6 can be molded without sink marks, the resin gear 55 with high precision can be formed.
Can be manufactured.
【００２６】[0026]
【発明の効果】本発明は上記構成により次の効果を発揮
する。請求項１は、歯部を備えた成形品を予め成形した
後、この成形品のディスク部に補強リブ又は補強ディス
クを添加するので、補強リブ又は補強ディスクが凝固す
る際に収縮しても、補強リブ又は補強ディスクの収縮は
歯部に影響しない。このため、樹脂ギヤの歯部にヒケが
発生する虞れがないので、精度のよい樹脂ギヤを製造す
ることができる。According to the present invention, the following effects are exhibited by the above configuration. Claim 1 is that, after a molded article having teeth is molded in advance, a reinforcing rib or a reinforcing disk is added to the disk portion of the molded article. Shrinkage of the reinforcing ribs or disks does not affect the teeth. For this reason, since there is no fear that sinks may occur in the teeth of the resin gear, a highly accurate resin gear can be manufactured.
【００２７】また、歯部のキャビティにはディスク部の
キャビティから均一に樹脂を流し込むことができるの
で、前記特公平７−２２９４２号公報の不具合を解消し
て歯部の歯面を精度よく成形することができる。この結
果、平歯車においては、たたかれ音の発生を防止して防
音効果を高めることができる。In addition, since resin can be uniformly poured into the cavity of the tooth portion from the cavity of the disk portion, the disadvantage of Japanese Patent Publication No. Hei 7-22942 can be solved and the tooth surface of the tooth portion can be accurately formed. be able to. As a result, in the spur gear, it is possible to enhance the soundproofing effect by preventing the generation of a rattling sound.
【００２８】請求項２は、ディスク部に補強リブ又は補
強ディスクを備えたので、樹脂ギヤに種々の力（一例と
してスラスト）が働いてもディスク部が歪む心配はな
い。樹脂ギヤの噛合いがズレないので、騒音が発生する
心配はない。In the second aspect, since the disk portion is provided with the reinforcing rib or the reinforcing disk, there is no fear that the disk portion is distorted even when various forces (for example, thrust) act on the resin gear. Since the meshing of the resin gears is not displaced, there is no fear of generating noise.
【図１】本発明に係る樹脂ギヤの斜視図FIG. 1 is a perspective view of a resin gear according to the present invention.
【図２】図１の２−２線断面図FIG. 2 is a sectional view taken along line 2-2 of FIG.
【図３】本発明に係る樹脂ギヤ製造用金型（第１上型）
の断面図FIG. 3 is a mold (first upper mold) for manufacturing a resin gear according to the present invention.
Cross section of
【図４】本発明に係る第２上型の断面図FIG. 4 is a sectional view of a second upper mold according to the present invention.
【図５】本発明に係る樹脂ギヤの製造方法の第１説明図FIG. 5 is a first explanatory view of a method for manufacturing a resin gear according to the present invention.
【図６】本発明に係る樹脂ギヤの製造方法の第２説明図FIG. 6 is a second explanatory view of the method for manufacturing a resin gear according to the present invention.
【図７】本発明に係るスライドテーブルタイプの２色成
形機を示した側面図FIG. 7 is a side view showing a slide table type two-color molding machine according to the present invention.
【図８】本発明に係る樹脂ギヤ（第２実施例）の斜視図FIG. 8 is a perspective view of a resin gear (second embodiment) according to the present invention.
【図９】従来の代表的な樹脂ギヤ（はすば歯車）の作動
説明図FIG. 9 is a diagram illustrating the operation of a typical conventional resin gear (helical gear).
【図１０】従来の代表的な厚肉ディスク部の樹脂ギヤの
断面図FIG. 10 is a sectional view of a conventional typical thick resin gear of a thick disk.
１，５５…樹脂ギヤ、３…ディスク部、５…歯部、６…
成形品（一次成形品）、７…補強リブ、９…二次成形
品、５６…補強ディスク。1, 55 ... resin gear, 3 ... disk part, 5 ... tooth part, 6 ...
Molded product (primary molded product), 7: reinforcing rib, 9: secondary molded product, 56: reinforcing disk.
Claims (2)
の歯部を備えた成形品を予め成形する工程と、この成形
品のディスク部に補強リブ又は補強ディスクを添加する
工程とからなる樹脂ギヤの製造方法。1. A resin gear comprising: a step of previously forming a molded article having teeth wider than the disk section on the outer periphery of the disk section; and a step of adding a reinforcing rib or a reinforcing disk to the disk section of the molded article. Manufacturing method.
の歯部を備えた樹脂ギヤにおいて、ディスク部に補強リ
ブ又は補強ディスクを備えたことを特徴とする樹脂ギ
ヤ。2. A resin gear having a tooth portion wider than the disk portion on the outer periphery of the disk portion, wherein the disk portion is provided with a reinforcing rib or a reinforcing disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32919997A JPH11156886A (en) | 1997-11-28 | 1997-11-28 | Manufacture of resin gear, and resin gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32919997A JPH11156886A (en) | 1997-11-28 | 1997-11-28 | Manufacture of resin gear, and resin gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11156886A true JPH11156886A (en) | 1999-06-15 |
Family
ID=18218765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32919997A Pending JPH11156886A (en) | 1997-11-28 | 1997-11-28 | Manufacture of resin gear, and resin gear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11156886A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007130902A (en) * | 2005-11-10 | 2007-05-31 | Ricoh Co Ltd | Injection mold |
| JP2013241260A (en) * | 2012-05-22 | 2013-12-05 | Sumitomo Heavy Ind Ltd | Continuous unloader |
| US20160062299A1 (en) * | 2014-09-03 | 2016-03-03 | Samsung Electronics Co., Ltd. | Gear apparatus and image forming apparatus |
| KR20180064685A (en) * | 2016-12-06 | 2018-06-15 | 김정완 | reducer for preventing wear of bearing due to thrust of helix gear |
-
1997
- 1997-11-28 JP JP32919997A patent/JPH11156886A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007130902A (en) * | 2005-11-10 | 2007-05-31 | Ricoh Co Ltd | Injection mold |
| JP2013241260A (en) * | 2012-05-22 | 2013-12-05 | Sumitomo Heavy Ind Ltd | Continuous unloader |
| US20160062299A1 (en) * | 2014-09-03 | 2016-03-03 | Samsung Electronics Co., Ltd. | Gear apparatus and image forming apparatus |
| US9483010B2 (en) * | 2014-09-03 | 2016-11-01 | Samsung Electronics Co., Ltd. | Gear apparatus having reinforcing member and image forming apparatus |
| KR20180064685A (en) * | 2016-12-06 | 2018-06-15 | 김정완 | reducer for preventing wear of bearing due to thrust of helix gear |
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