JPH0739092A - Rotor of clock motor - Google Patents

Rotor of clock motor

Info

Publication number
JPH0739092A
JPH0739092A JP5176929A JP17692993A JPH0739092A JP H0739092 A JPH0739092 A JP H0739092A JP 5176929 A JP5176929 A JP 5176929A JP 17692993 A JP17692993 A JP 17692993A JP H0739092 A JPH0739092 A JP H0739092A
Authority
JP
Japan
Prior art keywords
permanent magnet
rotor
arm parts
rotor shaft
arm portions
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
JP5176929A
Other languages
Japanese (ja)
Inventor
Shinichi Miyamoto
眞一 宮本
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.)
Seikosha KK
Original Assignee
Seikosha KK
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 Seikosha KK filed Critical Seikosha KK
Priority to JP5176929A priority Critical patent/JPH0739092A/en
Publication of JPH0739092A publication Critical patent/JPH0739092A/en
Pending legal-status Critical Current

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  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

PURPOSE:To make a rotor shaft hold a permanent magnet by a snap-fit method with a simple construction and without reqiring the high dimensional accuracy of the permanent magnet. CONSTITUTION:A plurality of arm parts 24 which are extended along the end plane of a doughnut-shaped permanent magnet 10 are provided on a rotor shaft 20 which penetrates the permanent magnet 10. Holding pieces 25 which descend along the outer circumferential plane of the permanent magnet 10 are provided on the tips of the respective arm parts 24. Retaining protrusions 27 which retain the permanent magnet 10 and auxiliary protrusions 26 which prevent the permanent magnet from rotation are provided on the tip parts of the respective holding pieces 25. Further, protrusions 28 which function as fulcra when the respective arm parts 24 are elastically deformed are provided on the respective arm parts 24 or on the end plane of the permanent magnet 10 which faces the arm parts 24.

Description

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

【0001】[0001]

【産業上の利用分野】本発明は、時計に用いるモータの
ロータに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor rotor used in a timepiece.

【0002】[0002]

【従来の技術】従来の技術としては、例えば実開昭51
−149816号公報に示されているように、ロータ
は、永久磁石と回転軸からなり、回転軸には、永久磁石
をスナップフィット形式で保持するために、回転軸から
径方向に延伸するアーム部と、このアーム部の先端から
永久磁石の外周面にそって垂下する保持片と、この保持
片の先端部に永久磁石に係止する係止突起が形成されて
いる。
2. Description of the Related Art As a conventional technique, for example, SAIKAI Sho 51
As disclosed in Japanese Patent Publication No. 149816, a rotor is composed of a permanent magnet and a rotating shaft, and an arm portion extending in the radial direction from the rotating shaft for holding the permanent magnet in a snap fit form on the rotating shaft. A holding piece that hangs from the tip of the arm along the outer peripheral surface of the permanent magnet, and a locking projection that locks the permanent magnet is formed at the tip of the holding piece.

【0003】[0003]

【発明が解決しようとする課題】上記の構成では、アー
ム部が永久磁石の端面に密着する状態で永久磁石が回転
軸に保持されるために、永久磁石を回転軸に保持しよう
とするときに、永久磁石の高さが高すぎると保持できな
いし、その逆に永久磁石の高さが低すぎるとガタを生じ
ることになる。そのため永久磁石の寸法精度を厳しく管
理する必要があった。
In the above structure, since the permanent magnet is held by the rotary shaft in a state where the arm portion is in close contact with the end surface of the permanent magnet, when the permanent magnet is held by the rotary shaft, However, if the height of the permanent magnet is too high, it cannot be held, and conversely, if the height of the permanent magnet is too low, play will occur. Therefore, it was necessary to strictly control the dimensional accuracy of the permanent magnet.

【0004】本発明の目的は、永久磁石の寸法精度をそ
れほど高くする必要なしに、永久磁石を回転軸に確実に
保持することにある。
An object of the present invention is to securely hold the permanent magnet on the rotating shaft without requiring the dimensional accuracy of the permanent magnet to be so high.

【0005】[0005]

【課題を解決するための手段】本発明による時計用モー
タのロータは、ドーナツ型の永久磁石を貫通するロータ
軸に、上記永久磁石の端面と平行に延伸する複数のアー
ム部が形成してあり、上記アーム部のそれぞれの先端部
からは、上記永久磁石の外周面にそって垂下する保持片
が形成してあり、各保持片の先端部には、上記永久磁石
を係止する係止突起が形成してあり、上記各アーム部と
当該各アーム部が対向する上記永久磁石の上記端面との
一方には、当該各アーム部を弾性的に変形させるときの
支点となる突起を形成したものである。
In the rotor of a timepiece motor according to the present invention, a plurality of arm portions extending parallel to the end face of the permanent magnet are formed on a rotor shaft that penetrates the donut-shaped permanent magnet. A holding piece is formed so as to hang along the outer peripheral surface of the permanent magnet from each tip of the arm portion, and a locking projection for locking the permanent magnet is formed at the tip of each holding piece. And a protrusion serving as a fulcrum when elastically deforming each of the arm portions is formed on one of the end portions of the permanent magnets facing each of the arm portions. Is.

【0006】[0006]

【作用】上記構成によれば、永久磁石の寸法精度が悪く
ても、上記各アーム部と当該各アーム部が対向する上記
永久磁石の上記端面との一方には、当該各アーム部を弾
性的に変形させるときの支点となる突起を形成してある
ので、磁石装着状態で突起を支点として上記各アーム部
が変形し、永久磁石を保持できる。
According to the above construction, even if the dimensional accuracy of the permanent magnet is poor, the arm portion is elastically attached to one of the arm portion and the end surface of the permanent magnet facing the arm portion. Since a protrusion serving as a fulcrum when deformed is formed, each of the arm portions is deformed around the protrusion as a fulcrum when the magnet is attached, and the permanent magnet can be held.

【0007】[0007]

【実施例】以下、本発明の詳細を添付図面に示す好適な
一実施例にそって説明すると、本発明に係る時計用モー
タのロータは、ドーナツ型の永久磁石10と、この永久
磁石10を保持するロータ軸20とから構成されてい
る。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to a preferred embodiment shown in the accompanying drawings. A rotor of a timepiece motor according to the present invention includes a donut-shaped permanent magnet 10 and the permanent magnet 10. It is composed of a rotor shaft 20 to be held.

【0008】永久磁石10は、サマリウム・コバルトや
フェライト等の磁性材料にて形成されており、径方向に
N、Sの2極に着磁され、中心部には、ロータ軸20が
貫通可能な中心孔11が、外周下端部には複数(この実
施例では3個)の凹部12がそれぞれ形成されている。
The permanent magnet 10 is made of a magnetic material such as samarium-cobalt or ferrite, is magnetized into two poles N and S in the radial direction, and the rotor shaft 20 can penetrate through the central portion thereof. A center hole 11 and a plurality of (three in this embodiment) recesses 12 are formed at the lower end of the outer periphery.

【0009】ロータ軸20は、ポリアセタール等のエン
ジニアリングプラスチックにて一体に形成されたもので
あって、図示しない時計輪列の一つ(駆動車)と噛合す
るロータピニオン21を一体に有し、両端部には図示し
ない軸受によって回転自在に支持されるホゾ部22、2
3が形成されている。
The rotor shaft 20 is integrally formed of engineering plastic such as polyacetal, and integrally has a rotor pinion 21 that meshes with one of the timepiece trains (not shown) (driving wheel). The hoso portions 22, 2 rotatably supported by bearings (not shown)
3 is formed.

【0010】さらに、ロータ軸20からは、複数(この
実施例では6本)のアーム部24が径方向に一体に延出
するように形成されている。各アーム部24は、2本を
1組とするものであって、各組のアーム部24の先端部
からはそれを一つに繋ぐ保持片25が一体に形成されて
いる。
Further, a plurality (six in this embodiment) of arm portions 24 are formed so as to extend integrally from the rotor shaft 20 in the radial direction. Each of the arm portions 24 is a set of two pieces, and a holding piece 25 that connects the arm portions 24 of each pair is integrally formed from the tip end portion of the arm portion 24.

【0011】各保持片25は、永久磁石10の外周面に
そって垂下し、その下端部には永久磁石10の下縁部に
係止する係止突起27が内側に向けて突出形成されてい
る。
Each holding piece 25 hangs along the outer peripheral surface of the permanent magnet 10, and a locking projection 27 for locking the lower edge of the permanent magnet 10 is formed at the lower end thereof so as to project inward. There is.

【0012】係止突起27の内側面は傾斜面に形成さ
れ、永久磁石10をロータ軸20に装着するときのガイ
ド面27aとなっており、その上面27bは永久磁石1
0の下面に係合して永久磁石10の抜け止めの作用を補
助している。
The inner surface of the locking projection 27 is formed as an inclined surface, which serves as a guide surface 27a when the permanent magnet 10 is mounted on the rotor shaft 20, and the upper surface 27b thereof is the upper surface 27b.
It engages with the lower surface of 0 to help prevent the permanent magnet 10 from coming off.

【0013】係止突起27の上面27bには、永久磁石
10をロータ軸20に対し接着剤を使用することなしに
相対的に回転不能に保持するための補助突起26が一体
に形成されており、この補助突起26は永久磁石10の
外周面に形成されている凹部12に係止可能になってい
る。
On the upper surface 27b of the locking projection 27, an auxiliary projection 26 for integrally holding the permanent magnet 10 to the rotor shaft 20 in a non-rotatable manner without using an adhesive is integrally formed. The auxiliary protrusion 26 can be engaged with the recess 12 formed on the outer peripheral surface of the permanent magnet 10.

【0014】さらに、各アーム部24の裏面からは、突
起28が一体に突出形成されている。この突起28の存
在により各アーム部24の裏面と永久磁石10の上面と
の間には空間が形成される。また、突起28の下端から
係止突起27の上面27bまでの間隔dは、永久磁石1
0の厚みよりも僅かに小さく設定されている。したがっ
て各アーム部24は、図2の装着状態で突起28を支点
として若干下向きに弓状に弾性的に変形させられること
になる。
Further, a protrusion 28 is integrally formed on the back surface of each arm portion 24. Due to the presence of the protrusion 28, a space is formed between the back surface of each arm portion 24 and the upper surface of the permanent magnet 10. Further, the distance d from the lower end of the protrusion 28 to the upper surface 27b of the locking protrusion 27 is determined by the permanent magnet 1
It is set to be slightly smaller than the thickness of 0. Therefore, each arm 24 is elastically deformed downward in a bow shape with the protrusion 28 as a fulcrum in the mounted state of FIG.

【0015】次に上記構成のロータの組立、つまり永久
磁石10のロータ軸20への装着動作について説明す
る。まず永久磁石10をロータ軸20に対しホゾ部23
側からあてがってロータ軸20を永久磁石10の中心孔
11に通して永久磁石10を押し込む。このとき、係止
突起27のガイド面27aに永久磁石10の上縁部が当
接し、保持片25が外側に押し拡げられ、係止突起27
が永久磁石10の外周面に接した状態で永久磁石10が
押し込まれていく。そして永久磁石10の上面が突起2
8に当接する位置まで永久磁石10を押し進めた状態で
各アーム部24の先端部を下方に押し下げると、各アー
ム部24は突起28を支点として下方に若干弓なりに弾
性的に変形させられ、その結果、保持片25の係止突起
27が永久磁石10の下縁部に係合する。それと同時
に、補助突起26が永久磁石10の凹部12に係合し、
永久磁石10はロータ軸20に対し相対的には回転不能
にかつ軸方向には離脱不能に保持される。
Next, the assembly of the rotor having the above-described structure, that is, the mounting operation of the permanent magnet 10 on the rotor shaft 20 will be described. First, the permanent magnet 10 is attached to the rotor shaft 20 with
The rotor shaft 20 is applied from the side and the permanent magnet 10 is pushed through the center hole 11 of the permanent magnet 10. At this time, the upper edge of the permanent magnet 10 comes into contact with the guide surface 27a of the locking projection 27, the holding piece 25 is pushed outward, and the locking projection 27
The permanent magnet 10 is pushed in while being in contact with the outer peripheral surface of the permanent magnet 10. The upper surface of the permanent magnet 10 is the protrusion 2
When the tip end of each arm portion 24 is pushed down in a state where the permanent magnet 10 is pushed forward to a position where it abuts on 8, the arm portions 24 are elastically deformed downward in a slightly bowed manner with the projection 28 as a fulcrum. As a result, the locking projection 27 of the holding piece 25 engages with the lower edge of the permanent magnet 10. At the same time, the auxiliary protrusion 26 engages with the recess 12 of the permanent magnet 10,
The permanent magnet 10 is held so as not to be rotatable relative to the rotor shaft 20 and so as not to be disengaged in the axial direction.

【0016】[0016]

【他の実施例】上記実施例では、アーム部24の2本を
1組として保持片25を設けているが、保持片25とア
ーム部24とが1対1に対応する構成とすることも可能
であり、保持片25およびそれに対応するアーム部24
は、各々少なくとも2本ずつとすることも可能である。
また、突起28は、上記実施例では各アーム部24の裏
面に一体に突出形成してあるが永久磁石10の上面に形
成しても同一の作用を奏することができる。
Other Embodiments In the above embodiment, the holding pieces 25 are provided by using two arms 24 as one set, but the holding pieces 25 and the arms 24 may have a one-to-one correspondence. It is possible, and the holding piece 25 and the corresponding arm portion 24
It is also possible to have at least two each.
Further, although the protrusion 28 is integrally formed on the back surface of each arm portion 24 in the above-described embodiment, the same effect can be obtained even if the protrusion 28 is formed on the upper surface of the permanent magnet 10.

【0017】[0017]

【発明の効果】以上詳細に説明した本発明に係るロータ
の構成によれば、永久磁石の厚みに多少の寸法誤差があ
っても、アーム部を突起により弓なりに弾性的に変形さ
せることで確実に係止突起を凹部に係止することが可能
である。このため、もともと精度を出し難い永久磁石の
厚み精度を厳しく管理する必要がなくなるため、ロータ
の製造コストを引き下げることができる。
According to the structure of the rotor according to the present invention described in detail above, even if there is a slight dimensional error in the thickness of the permanent magnet, the arm portion is elastically deformed in a bow shape by the projection to ensure reliability. It is possible to lock the locking projection in the recess. For this reason, it is not necessary to strictly control the thickness accuracy of the permanent magnet, which is originally difficult to obtain accuracy, so that the manufacturing cost of the rotor can be reduced.

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

【図1】本発明に係るロータの平面図FIG. 1 is a plan view of a rotor according to the present invention.

【図2】図1におけるA−A線断面図FIG. 2 is a sectional view taken along line AA in FIG.

【符号の説明】[Explanation of symbols]

10 永久磁石 12 凹部 20 ロータ軸 24 アーム部 25 保持片 26 補助突起 27 係止突起 28 突起 10 Permanent Magnet 12 Recess 20 Rotor Shaft 24 Arm 25 Holding Piece 26 Auxiliary Protrusion 27 Locking Protrusion 28 Protrusion

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 ドーナツ型の永久磁石を貫通するロータ
軸には、上記永久磁石の端面と平行に延伸する複数のア
ーム部が形成してあり、 上記アーム部のそれぞれの先端部からは、上記永久磁石
の外周面にそって垂下する保持片が形成してあり、 各保持片の先端部には、上記永久磁石を係止する係止突
起が形成してあり、 上記各アーム部と当該各アーム部が対向する上記永久磁
石の上記端面との一方には、当該各アーム部を弾性的に
変形させるときの支点となる突起が形成してあることを
特徴とする時計用モータのロータ。
1. A plurality of arm portions extending parallel to an end surface of the permanent magnet are formed on a rotor shaft passing through a donut-shaped permanent magnet, and the arm portions extend from the respective tip portions of the arm portion to A holding piece is formed so as to hang down along the outer peripheral surface of the permanent magnet, and a locking projection for locking the permanent magnet is formed at the tip of each holding piece. A rotor for a timepiece motor, wherein a projection serving as a fulcrum when elastically deforming each of the arm portions is formed on one of the end surfaces of the permanent magnets facing the arm portions.
【請求項2】 請求項1において、上記永久磁石の外周
部には、上記係止突起に設けてある補助突起が係止する
凹部が形成してあることを特徴とする時計用モータのロ
ータ。
2. The rotor for a timepiece motor according to claim 1, wherein a concave portion for engaging an auxiliary projection provided on the locking projection is formed on an outer peripheral portion of the permanent magnet.
JP5176929A 1993-07-16 1993-07-16 Rotor of clock motor Pending JPH0739092A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5176929A JPH0739092A (en) 1993-07-16 1993-07-16 Rotor of clock motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5176929A JPH0739092A (en) 1993-07-16 1993-07-16 Rotor of clock motor

Publications (1)

Publication Number Publication Date
JPH0739092A true JPH0739092A (en) 1995-02-07

Family

ID=16022220

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5176929A Pending JPH0739092A (en) 1993-07-16 1993-07-16 Rotor of clock motor

Country Status (1)

Country Link
JP (1) JPH0739092A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009124785A (en) * 2007-11-12 2009-06-04 Mitsubishi Electric Corp Motor for electric power steering device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009124785A (en) * 2007-11-12 2009-06-04 Mitsubishi Electric Corp Motor for electric power steering device
JP4527145B2 (en) * 2007-11-12 2010-08-18 三菱電機株式会社 Electric power steering motor
US7800265B2 (en) 2007-11-12 2010-09-21 Mitsubishi Electric Corporation Motor for an electric power steering apparatus

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