JPH0622512A - Injection molding method for core cover in rotor of motor - Google Patents

Injection molding method for core cover in rotor of motor

Info

Publication number
JPH0622512A
JPH0622512A JP4173458A JP17345892A JPH0622512A JP H0622512 A JPH0622512 A JP H0622512A JP 4173458 A JP4173458 A JP 4173458A JP 17345892 A JP17345892 A JP 17345892A JP H0622512 A JPH0622512 A JP H0622512A
Authority
JP
Japan
Prior art keywords
mold
rotor
core cover
core
injection
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
Application number
JP4173458A
Other languages
Japanese (ja)
Inventor
Toshihiko Kaneko
敏彦 金子
Mikio Kawamura
幹夫 川村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsumi Electric Co Ltd
Original Assignee
Mitsumi Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsumi Electric Co Ltd filed Critical Mitsumi Electric Co Ltd
Priority to JP4173458A priority Critical patent/JPH0622512A/en
Publication of JPH0622512A publication Critical patent/JPH0622512A/en
Pending legal-status Critical Current

Links

Landscapes

  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

PURPOSE:To improve the quality of a rotor by forming a core cover as thin as possible which is to be attached to the rotor of a motor and thereby increasing the number of turns of a coil for rotor. CONSTITUTION:Injection gates 41 for injecting a filler are placed at three points uniformly at the central and peripheral location for respective coil spaces in dies for forming core covers between coils 23 and cores 21 of a rotor 20 respectively, and the filler is injected to the dies.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明はモータのロータにおけ
るコアカバーの射出成形方法に関するものであり、特
に、ロータの性能を向上するモータのロータにおけるコ
アカバーの射出成形方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core cover injection molding method for a motor rotor, and more particularly to a core cover injection molding method for improving the performance of the rotor.

【0002】[0002]

【従来の技術】従来この種モータのロータにおけるコア
カバーの射出成形方法を図10乃至図13に従って説明
する。図10はモータのロータ1の断面を示し、ロータ
1のコア2にコイル3が巻回されている。また、該コア
2とコイル3との間にコアカバー4を介在させ、コア2
とコイル3とのショートを防止している。
2. Description of the Related Art A conventional method of injection molding a core cover of a rotor of a motor of this type will be described with reference to FIGS. FIG. 10 shows a cross section of a rotor 1 of a motor, and a coil 3 is wound around a core 2 of the rotor 1. Further, the core cover 4 is interposed between the core 2 and the coil 3,
And a short circuit between the coil 3 and the coil 3 are prevented.

【0003】図11はコアカバー4を形成する金型を示
し、第1の金型5に第2の金型6を圧接している。第2
の金型にはコアカバー4の型7が刻設されている。そし
て、第1の金型5の湯口8より溶解した樹脂等の注入材
9を注入して射出成形を行う。図12に示すように、注
入材9の射出ゲート10は型7の中央部位3カ所に配設
されている。また、垂直部7aの上方に設けられている
ため、該射出の際には図13に示すように、注入材9が
型7の垂直部7a下って孤を描きながら流動した後、型
7の水平部7bへ注入材9が充填される。
FIG. 11 shows a die for forming the core cover 4, and a first die 5 and a second die 6 are pressed against each other. Second
The mold 7 is engraved with the mold 7 of the core cover 4. Then, an injection material 9 such as a melted resin is injected from the sprue 8 of the first mold 5 to perform injection molding. As shown in FIG. 12, the injection gates 10 for the injection material 9 are arranged at three central portions of the mold 7. Further, since it is provided above the vertical portion 7a, at the time of injection, as shown in FIG. The filling material 9 is filled in the horizontal portion 7b.

【0004】而して、注入材9が硬化した後、第1の金
型5と第2の金型6とを離間してエジェクタピン(図示
せず)にて該成形されたコアカバー4を取り出す。
After the injection material 9 is hardened, the first mold 5 and the second mold 6 are separated from each other and the molded core cover 4 is formed by an ejector pin (not shown). Take it out.

【0005】[0005]

【発明が解決しようとする課題】上述した従来のモータ
のロータにおけるコアカバーの射出成形方法射出成形方
法は射出ゲートを型の中央部位3カ所に設けられてい
る。該コアカバーはコイルの巻回数を多くしてコイル特
性を増幅するため、可及的に薄く形成することが求めら
れている。しかし、射出ゲートが中央部位3カ所のみの
ため、狭小な型では注入材を充填するには該注入材の流
動長が長すぎて困難であった。因みに、コアカバーを
0.2mm以下にすることができず、コイル特性を増幅
するこが不可能であってロータの性能の向上に支承をき
たしていた。
The injection molding method of the core cover in the rotor of the above-mentioned conventional motor In the injection molding method, injection gates are provided at three central portions of the mold. The core cover is required to be formed as thin as possible in order to increase the number of windings of the coil and amplify the coil characteristics. However, since the injection gate has only three central portions, it was difficult to fill the injection material with a narrow mold because the flow length of the injection material was too long. Incidentally, the core cover could not be reduced to 0.2 mm or less, and it was impossible to amplify the coil characteristics, which supported the improvement of the rotor performance.

【0006】そこで、ロータのコアとコアとの間に介在
させるコアカバーの厚さを可及的に薄く形成し、ロータ
の性能を向上するために解決すべき技術的課題が生じて
くるのであり、本発明は該課題を解決することを目的と
する。
Therefore, there arises a technical problem to be solved in order to improve the performance of the rotor by forming the core cover interposed between the rotor cores as thin as possible. The present invention aims to solve the problems.

【0007】[0007]

【課題を解決するための手段】この発明は上記目的を達
成するために提案されたものであり、ロータのコアとコ
イルとの間に介在させるモータのロータにおけるコアカ
バーの射出成形方法において、該コアカバーを形成する
金型に注入材を射出する射出ゲートを該コアカバーの型
の外周部及び中心部位にそれぞれ3カ所ずつ均等に配設
し、該注入材を射出することを特徴とするモータのロー
タにおけるコアカバーの射出成形方法を提供せんとする
ものである。
SUMMARY OF THE INVENTION The present invention has been proposed in order to achieve the above object, and in an injection molding method of a core cover in a rotor of a motor interposed between a rotor core and a coil, A motor characterized in that injection gates for injecting an injectable material into a mold for forming a core cover are evenly arranged at three locations on the outer peripheral portion and the central portion of the mold of the core cover to inject the injectable material. To provide an injection molding method of a core cover in a rotor of the above.

【0008】[0008]

【作用】この発明はコアカバーを形成する金型に注入材
を注入させる射出ゲートを該コアカバーの型の外周部及
び中心部位にそれぞれ3カ所ずつ均等に配設しているの
で、注入材の流動長を短縮して狭小な型であっても確実
に注入材を充填することができる。
According to the present invention, the injection gates for injecting the injection material into the mold for forming the core cover are evenly arranged at the outer peripheral portion and the central portion of the core cover in three places, respectively. It is possible to reliably fill the injection material even with a narrow mold by shortening the flow length.

【0009】[0009]

【実施例】以下、この発明の一実施例を図1乃至図9に
従って詳述する。図において20はモータのロータであ
り、図1及び図2に示すように、コア21の収容部22
にコイル23が巻装されている。尚、24はロータ20
のシャフト、25はコミンテータである。また、該コア
21とコイル23との間にはコアカバー26を介在させ
ててあり、該コア21とコイル23とのショートを防止
している。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. In the figure, 20 is a rotor of a motor, and as shown in FIGS.
A coil 23 is wound around. Incidentally, 24 is the rotor 20
Shaft, 25 is a comminator. A core cover 26 is interposed between the core 21 and the coil 23 to prevent a short circuit between the core 21 and the coil 23.

【0010】該コアカバー26は図3及び図4に示すよ
うに、水平部27と垂直部28とが一体成形されてい
る。該水平部27は図1及び図2に示したコア21の前
面に当接し、垂直部28はコア21の収容部22の内側
面に当接するように形成されている。一方、該コアカバ
ー26は樹脂に硝子繊維を混入して形成されてある。更
に、該コアカバー26の水平部27内側面中央部にはリ
ブ29を設けている。
As shown in FIGS. 3 and 4, the core cover 26 is integrally formed with a horizontal portion 27 and a vertical portion 28. The horizontal portion 27 contacts the front surface of the core 21 shown in FIGS. 1 and 2, and the vertical portion 28 contacts the inner surface of the housing portion 22 of the core 21. On the other hand, the core cover 26 is formed by mixing glass fiber with resin. Further, a rib 29 is provided at the center of the inner surface of the horizontal portion 27 of the core cover 26.

【0011】図5は図4に示したコアカバー26の金型
30を示し、固定金型31と可動金型32とから形成さ
れている。固定金型31に湯口33及びランナー34並
びにサブランナー35が設けれている。一方、前記可動
金型32は第1の可動金型36及び第2の可動金型37
にて構成されている。図5及び図6に示すように、第1
の可動金型36には図4に示したコアカバー26の水平
部27の水平型38が刻設されてあり、更に、図4に示
した垂直部28の外周と同形の貫通孔39を開穿してあ
る。
FIG. 5 shows the mold 30 of the core cover 26 shown in FIG. 4, which is composed of a fixed mold 31 and a movable mold 32. The fixed die 31 is provided with a sprue 33, a runner 34, and a sub-runner 35. On the other hand, the movable mold 32 includes a first movable mold 36 and a second movable mold 37.
It is composed of. As shown in FIGS. 5 and 6, the first
The movable mold 36 is engraved with a horizontal mold 38 of the horizontal part 27 of the core cover 26 shown in FIG. 4, and a through hole 39 having the same shape as the outer periphery of the vertical part 28 shown in FIG. 4 is opened. I wear it.

【0012】また、第1の可動金型36の下方に設けら
れた第2の可動金型37にはコアピン40が固設されて
あり、該コアピン40を第1の可動金型36の貫通孔3
9に嵌入できるように構成している。そして、該貫通孔
39とコアピン40にて図4に示したコアカバー26の
垂直部28の垂直型41を構成している。一方、前記サ
ブランナー35には射出ゲート42,43は6カ所設け
されてあり、射出ゲート42は水平型38の中央部位
に、射出ゲート43は水平型38の外周部位にそれぞれ
3カ所ずつ均等に配列されてあり、内側の射出ゲート4
2は垂直型41と上下位置を異にして配設されている。
更に、コアピン40と可動金型32との間に間隙を設
け、垂直型41の下端部全周から可動金型32の下面へ
エアベント44を延設してある。
Further, a core pin 40 is fixedly mounted on a second movable mold 37 provided below the first movable mold 36, and the core pin 40 is inserted through the through hole of the first movable mold 36. Three
It is configured so that it can be fitted into the device 9. The through hole 39 and the core pin 40 form a vertical die 41 of the vertical portion 28 of the core cover 26 shown in FIG. On the other hand, the sub-runner 35 is provided with six injection gates 42 and 43. The injection gate 42 is evenly provided at the central portion of the horizontal die 38, and the injection gate 43 is evenly provided at the outer circumferential portion of the horizontal die 38 at three locations. Arranged and inner injection gate 4
The vertical mold 41 and the vertical mold 2 are arranged differently from each other.
Furthermore, a gap is provided between the core pin 40 and the movable mold 32, and an air vent 44 is extended from the entire lower end of the vertical mold 41 to the lower surface of the movable mold 32.

【0013】而して、図8に示す注入材45を湯口33
へ注入すれば、ランナー34,及びサブランナー35を
介して型46へ該注入材45が充填される。該注入材4
5は樹脂にガラス繊維を混入して形成してある。このと
きは、射出ゲート42及び射出ゲート43を水平型38
の上方に設けていることから、図5及び図7に示すよう
に、注入材45は水平方向(図中X方向)に流動した
後、垂直方向(図中Y方向)に流入する。
Then, the pouring material 45 shown in FIG.
By injecting into the mold 46, the mold 46 is filled with the injection material 45 through the runner 34 and the sub-runner 35. The injection material 4
5 is formed by mixing glass fiber with resin. At this time, the injection gate 42 and the injection gate 43 are connected to the horizontal mold 38.
5 and 7, the injecting material 45 flows in the horizontal direction (X direction in the drawing) and then flows in the vertical direction (Y direction in the drawing).

【0014】即ち、注入材45は型46の水平型38に
充填された後、垂直型41に充填される。従って、射出
ゲート42,43を6カ所設けたことと注入材45の流
動経路が孤を描かなくなったこととが相俟って、注入材
45の流動長が短縮される。更に、垂直型41の下方に
は全周に渡って可動金型32とコアピン40との間に間
隙Δを形成してエアベント44を設けているので、図8
に示すように、型46内のエアやガスが外方に放出され
て確実に型46内へ注入材45を充填することができ
る。 一方、注入材45が硬化して形成されたコアカバ
ー26を取り出す際には、図9に示すように、先ず、可
動金型32を固定金型31より離間させる。このとき
は、硬化した注入材45がサブランナー35の下端部に
てコアカバー26より切断される。そして、第1の可動
金型36より第2の可動金型37を離間してコアピン4
0をコアカバー26から脱離させ、エジェクトピンを用
いてコアカバー26を第1の可動金型36より脱型す
る。
That is, the injection material 45 is filled in the horizontal die 38 of the die 46 and then in the vertical die 41. Therefore, the flow length of the injection material 45 is shortened in combination with the fact that the injection gates 42 and 43 are provided at six places and the flow path of the injection material 45 is not deviated. Further, below the vertical mold 41, an air vent 44 is provided over the entire circumference by forming a gap Δ between the movable mold 32 and the core pin 40, so that FIG.
As shown in, the air and gas in the mold 46 are released to the outside, so that the injection material 45 can be reliably filled in the mold 46. On the other hand, when taking out the core cover 26 formed by hardening the injection material 45, first, as shown in FIG. 9, the movable mold 32 is separated from the fixed mold 31. At this time, the hardened injection material 45 is cut from the core cover 26 at the lower end portion of the sub-runner 35. Then, the second movable mold 37 is separated from the first movable mold 36 to separate the core pin 4
0 is released from the core cover 26, and the core cover 26 is released from the first movable mold 36 using an eject pin.

【0015】このときは、前述したように、コアピン4
0をコアカバー26より離脱させていることから、コア
カバー26の可動金型32に対する接触面積が小となっ
て、該脱型のときのコアカバー26の変形を防止するこ
とができる。また、固定金型31には凹部47を設け、
該凹部47の上面に前記サブランナー35を配設してい
る。更に、前記可動金型32には該凹部47に嵌合する
突部48を設け、該突部48部位にコアカバー26の型
46を刻設してある。従って、固定金型31と可動金型
32との位置決め及び脱着が容易になる。更に、図5に
示すように、サブランナー35の長さHが短縮されて注
入材45の流動長が更に減少されるため、コアカバー2
6の歩留り及び品質を向上することができる。
At this time, as described above, the core pin 4
Since 0 is separated from the core cover 26, the contact area of the core cover 26 with the movable mold 32 is small, and the deformation of the core cover 26 at the time of the mold release can be prevented. Further, the fixed mold 31 is provided with a recess 47,
The sub-runner 35 is arranged on the upper surface of the recess 47. Further, the movable mold 32 is provided with a projection 48 which fits into the recess 47, and the mold 46 of the core cover 26 is engraved on the projection 48. Therefore, the positioning and attachment / detachment of the fixed mold 31 and the movable mold 32 are facilitated. Further, as shown in FIG. 5, since the length H of the sub-runner 35 is shortened and the flow length of the injection material 45 is further reduced, the core cover 2
The yield and quality of No. 6 can be improved.

【0016】尚、この発明は、この発明の精神を逸脱し
ない限り種々の改変を為す事ができ、そして、この発明
が該改変せられたものに及ぶことは当然である。
The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified version.

【0017】[0017]

【発明の効果】この発明は上記一実施例に詳述したよう
に、コアカバーの金型に注入材を注入させる射出ゲート
を該コアカバーの型の外周部及び中心部位にそれぞれ3
カ所ずつ均等に配設しているので、注入材の流動長を短
縮して狭小な型であっても確実に該注入材を充填するこ
とができる。従って、コアカバーの厚さを可及的に薄く
形成してコイルの巻回数を増加することができるため、
該コイル特性と増幅してロータの性能を向上することが
できる等、正に著しい効果を奏する発明である。
As described in detail in the above one embodiment, the present invention has three injection gates for injecting the injection material into the mold of the core cover at the outer peripheral portion and the central portion of the mold of the core cover.
Since the injection material is evenly arranged at each position, it is possible to shorten the flow length of the injection material and reliably fill the injection material even with a narrow mold. Therefore, since the thickness of the core cover can be formed as thin as possible to increase the number of windings of the coil,
It is an invention that has a very remarkable effect such as being able to improve the performance of the rotor by being amplified with the coil characteristics.

【図面の簡単な説明】[Brief description of drawings]

【図1】ロータの一部切欠側面図。FIG. 1 is a partially cutaway side view of a rotor.

【図2】ロータの横断面図。FIG. 2 is a cross-sectional view of a rotor.

【図3】コアカバーの平面図FIG. 3 is a plan view of the core cover.

【図4】コアカバーの斜面図。FIG. 4 is a perspective view of a core cover.

【図5】金型の縦断面図。FIG. 5 is a vertical cross-sectional view of a mold.

【図6】可動金型の平面図。FIG. 6 is a plan view of a movable mold.

【図7】注入材の流動経路を示す解説図。FIG. 7 is an explanatory diagram showing a flow path of an injection material.

【図8】注入材を射出した状態を示す金型の縦断面図。FIG. 8 is a vertical cross-sectional view of a mold showing a state where an injection material is injected.

【図9】金型を展開した状態を示す縦断面図。FIG. 9 is a vertical cross-sectional view showing a state in which the mold is developed.

【図10】従来型のロータの横断面図。FIG. 10 is a cross-sectional view of a conventional rotor.

【図11】従来型の金型の縦断面図。FIG. 11 is a vertical cross-sectional view of a conventional mold.

【図12】従来型の可動金型の平面図。FIG. 12 is a plan view of a conventional movable mold.

【図13】従来型の金型内における注入材の流動経路を
示す解説図。
FIG. 13 is an explanatory diagram showing a flow path of an injection material in a conventional mold.

【符号の説明】[Explanation of symbols]

20 ロータ 21 コア 23 コイル 26 コアカバー 30 金型 42 43 射出ゲート 45 注入材 46 型 20 rotor 21 core 23 coil 26 core cover 30 mold 42 43 injection gate 45 injection material 46 type

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 ロータのコアとコイルとの間に介在させ
るモータのロータにおけるコアカバーの射出成形方法に
おいて、該コアカバーを形成する金型に注入材を射出す
る射出ゲートを該コアカバーの型の外周部及び中心部位
にそれぞれ3カ所ずつ均等に配設し、該注入材を射出す
ることを特徴とするモータのロータにおけるコアカバー
の射出成形方法。
1. An injection molding method of a core cover in a rotor of a motor interposed between a core and a coil of a rotor, wherein an injection gate for injecting an injection material into a mold forming the core cover is formed in the mold of the core cover. An injection molding method for a core cover in a rotor of a motor, wherein the injection material is injected evenly at three locations on the outer peripheral portion and the central portion of the same.
JP4173458A 1992-06-30 1992-06-30 Injection molding method for core cover in rotor of motor Pending JPH0622512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4173458A JPH0622512A (en) 1992-06-30 1992-06-30 Injection molding method for core cover in rotor of motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4173458A JPH0622512A (en) 1992-06-30 1992-06-30 Injection molding method for core cover in rotor of motor

Publications (1)

Publication Number Publication Date
JPH0622512A true JPH0622512A (en) 1994-01-28

Family

ID=15960854

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4173458A Pending JPH0622512A (en) 1992-06-30 1992-06-30 Injection molding method for core cover in rotor of motor

Country Status (1)

Country Link
JP (1) JPH0622512A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800020491A1 (en) * 2018-12-20 2020-06-20 Eldor Corp Spa ROTOR FOR AN ELECTRIC MACHINE AND METHOD OF REALIZATION OF SAID ROTOR

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800020491A1 (en) * 2018-12-20 2020-06-20 Eldor Corp Spa ROTOR FOR AN ELECTRIC MACHINE AND METHOD OF REALIZATION OF SAID ROTOR
WO2020128888A1 (en) * 2018-12-20 2020-06-25 Eldor Corporation S.P.A. Rotor for an electric machine and method for making said rotor

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