JP2999407B2 - Electromagnetic sensor - Google Patents
Electromagnetic sensorInfo
- Publication number
- JP2999407B2 JP2999407B2 JP33597695A JP33597695A JP2999407B2 JP 2999407 B2 JP2999407 B2 JP 2999407B2 JP 33597695 A JP33597695 A JP 33597695A JP 33597695 A JP33597695 A JP 33597695A JP 2999407 B2 JP2999407 B2 JP 2999407B2
- Authority
- JP
- Japan
- Prior art keywords
- sensitive element
- electromagnetic sensor
- mold
- resin
- bobbin
- 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.)
- Expired - Fee Related
Links
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、感応素子部をイン
サートモールドしてなる一体型の電磁センサに関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated electromagnetic sensor in which a sensitive element is insert-molded.
【０００２】[0002]
【従来の技術】コイル、ポールピース、永久磁石、及び
ヨークからなる感応素子部をインサートモールドするこ
とにより、車体に対する固定部と感応素子部の被覆部と
を一体成形した電磁センサが知られている（特開平６−
３４２００２号公報参照）。2. Description of the Related Art There is known an electromagnetic sensor in which a fixed portion to a vehicle body and a covering portion of a sensitive element portion are integrally formed by insert-molding a sensitive element portion including a coil, a pole piece, a permanent magnet, and a yoke. (Japanese Unexamined Patent Publication No.
No. 342002).
【０００３】このような形式の電磁センサは、一次製造
された感応素子部を金型内にインサートし、金型の内面
と感応素子部の外面との間に形成されたキャビティに溶
融樹脂を射出することにより、全体が一体的に構成され
る。従って、感応素子部の周囲に被覆部を形成する際
に、感応素子部を金型内に安定的に固定しなければなら
ない。[0003] In such an electromagnetic sensor, a primary manufactured sensitive element portion is inserted into a mold, and molten resin is injected into a cavity formed between the inner surface of the mold and the outer surface of the sensitive element portion. By doing so, the whole is integrally configured. Therefore, when forming the covering around the sensitive element section, the sensitive element section must be stably fixed in the mold.
【０００４】[0004]
【発明が解決しようとする課題】しかるに、金型と係合
する位置決め用の突起を感応素子部に設けた場合、この
突起が溶融樹脂流に干渉するため、突起のゲート中心か
ら遠ざかる側への樹脂の円滑な流れが阻害され、図７に
符号Ａで示す如く位置決め突起Ｐの下流側にエア溜まり
が発生し易くなる。そのため、感応素子部と被覆部との
密着性が部分的に低下するという問題があった。However, when a positioning projection for engaging with the mold is provided on the sensitive element portion, the projection interferes with the flow of the molten resin, so that the projection is moved away from the center of the gate. The smooth flow of the resin is hindered, and air accumulation is likely to occur on the downstream side of the positioning protrusion P as indicated by reference numeral A in FIG. Therefore, there has been a problem that the adhesion between the sensitive element portion and the coating portion is partially reduced.
【０００５】本発明は、このような従来技術に課せられ
た問題点を解消し、溶融樹脂流に干渉しないように構成
された対金型位置決め手段を備えた電磁センサを提供す
ることを目的に案出されたものである。An object of the present invention is to solve the problems imposed on the prior art and to provide an electromagnetic sensor provided with a mold positioning means which is configured so as not to interfere with the flow of molten resin. It was devised.
【０００６】[0006]
【課題を解決するための手段】このような目的を果たす
ために、本発明に於いては、感応素子部を金型内にイン
サートして溶融樹脂を射出することによって感応素子部
の周囲に被覆部を形成するようにした電磁センサに於い
て、感応素子部の軸線方向一端面に於ける樹脂射出ゲー
トを中心とする円周上に金型と係合可能な複数の位置決
め突起を互いに周方向に離間して突設し、該位置決め突
起のキャビティ内を臨む部分の形状を、ゲート中心から
離れるに従って周方向寸法が漸減するようにした。In order to achieve the above object, according to the present invention, the sensitive element portion is inserted into a mold, and a molten resin is injected to cover the periphery of the sensitive element portion. In the electromagnetic sensor which forms a portion, a plurality of positioning protrusions which can be engaged with the mold are circumferentially arranged on a circumference centered on the resin injection gate at one axial end surface of the sensitive element portion. The shape of the portion of the positioning projection facing the cavity is such that the circumferential dimension gradually decreases as the distance from the center of the gate increases.
【０００７】[0007]
【発明の実施の形態】以下に添付の図面を参照して本発
明の構成を詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the accompanying drawings.
【０００８】図１は、本発明に基づき構成された電磁セ
ンサを示している。この電磁センサ１は、後述する感応
素子部２の周囲を被覆するハウジング部３と、車体に対
する取付ステー部４と、ケーブル引出部５とを合成樹脂
材にて一体成形してなっている。なお、取付ステー部４
には、ボルト締付力を受けるための金属製カラー６がイ
ンサートされている。FIG. 1 shows an electromagnetic sensor constructed according to the present invention. In the electromagnetic sensor 1, a housing 3, which covers the periphery of a sensitive element 2, which will be described later, a mounting stay 4, which is attached to the vehicle body, and a cable lead-out portion 5, are integrally formed of a synthetic resin material. The mounting stay 4
, A metal collar 6 for receiving a bolt tightening force is inserted.
【０００９】感応素子部２は、別工程で製造される。こ
の感応素子部２は、図２に示すように、合成樹脂材にて
射出成形されたボビン７と、該ボビン７の軸線方向一端
面に圧入固定された一対のターミナル部材８のそれぞれ
に各端を連結された上でボビン７に巻回された導線から
なるコイル９と、ボビン７の中心孔に装着されたポール
ピース１０、永久磁石１１、及びヨーク１２と、車両の
制御回路にコネクタ（図示せず）を介して接続されるリ
ード線１３とからなっている。The sensitive element section 2 is manufactured in a separate process. As shown in FIG. 2, each of the sensitive element portions 2 has a bobbin 7 formed by injection molding of a synthetic resin material and a pair of terminal members 8 press-fitted and fixed to one end surface of the bobbin 7 in the axial direction. And a coil 9 composed of a conductive wire wound around the bobbin 7 with a pole piece 10, a permanent magnet 11, and a yoke 12 mounted in the center hole of the bobbin 7, and connectors (FIG. (Not shown).
【００１０】図３に示すように、コイル９の導線１４の
端末は、この端末が絡められたターミナル部材８の導線
保持部１５に電極を当ててかしめながら電流を流すこと
により、導線表面の絶縁層が熱で溶け、導線１４の銅層
とターミナル部材８にメッキされた錫層とが溶融し、導
線保持部１５にヒュージング接合されている。As shown in FIG. 3, the terminal of the conductive wire 14 of the coil 9 is electrically connected to the conductive wire holding portion 15 of the terminal member 8 where the terminal is entangled, and an electric current is caused to flow therethrough. The layer is melted by heat, and the copper layer of the conductor 14 and the tin layer plated on the terminal member 8 are melted and fused to the conductor holding part 15.
【００１１】またリード線１３は、ターミナル部材８の
リード線保持部１６に電極を当ててかしめながら電流を
流すことにより、リード線１３の銅層とターミナル部材
８にメッキされた錫層とが溶融し、かつリード線１３の
端末に予め施されている半田が接合部全体に溶け込み、
リード線保持部１６に強固に接合されている。なお、半
田は高温半田が使用される。The lead 13 is made to melt by melting the copper layer of the lead 13 and the tin layer plated on the terminal member 8 by applying an electric current to the lead holding portion 16 of the terminal member 8 while crimping the electrode. And the solder previously applied to the end of the lead wire 13 melts into the entire joint,
It is firmly joined to the lead wire holding part 16. Note that high-temperature solder is used as the solder.
【００１２】そしてボビン７の一端面に形成されている
保持溝１７に各リード線１３をそれぞれ軽圧入すること
により、リード線１３のずれ止めがなされる。なお、リ
ード線１３の被覆には、ケーブル押さえ１８が予めモー
ルド成形されている。Each lead wire 13 is lightly press-fitted into a holding groove 17 formed on one end surface of the bobbin 7, thereby preventing the lead wire 13 from shifting. Note that a cable retainer 18 is molded in advance on the covering of the lead wire 13.
【００１３】このように組み立てられた感応素子部２
と、金属製カラー６とを下型１９内にセットして上型２
０を閉じ、感応素子部２の外面と下型１９の内面間に形
成されたキャビティにゲート２１から溶融樹脂を射出す
ることにより、図５に併せて示したように、感応素子部
２及びカラー６をインサートした状態でハウジング部３
及びステー部４が一体成形される。Sensitive element part 2 assembled in this way
And the metal collar 6 are set in the lower mold 19 and the upper mold 2
0, and the molten resin is injected from the gate 21 into the cavity formed between the outer surface of the sensitive element section 2 and the inner face of the lower mold 19, as shown in FIG. 6 with the housing part 3 inserted
And the stay part 4 are integrally formed.
【００１４】この際、ボビン７の下端に円周を等分割す
る位置に形成された複数（２〜４箇所程度、本実施例に
於いては４箇所）の軸線方向延出部２２が、図４に併せ
て示した如く下型１９に形成された対応凹所２３の内周
面にて支持されると共に、下型１９のボビン受容部底面
に突設された複数の突部２４にボビン７のフランジ２５
の下面が当接することにより、下型１９内での感応素子
部２の位置決めがなされる。At this time, a plurality (about 2 to 4 places, in this embodiment, 4 places) of axially extending portions 22 formed at the lower end of the bobbin 7 at positions dividing the circumference equally are shown in FIG. As shown in FIG. 4, the bobbin 7 is supported by the inner peripheral surface of the corresponding recess 23 formed in the lower die 19 and the plurality of protrusions 24 projecting from the bottom surface of the bobbin receiving portion of the lower die 19. Flange 25
When the lower surface of the sensor element abuts, the sensitive element portion 2 is positioned in the lower mold 19.
【００１５】他方、ボビン７の上端面には、先端が尖っ
た３つの尖突部２６が周方向に等間隔をあけて突設され
ている。そしてそれに対応して上型２０の内面には、尖
突部２６を補完的に受容し得るテーパ孔２７が形成され
た３つの位置決め突部２８が突設されている。これによ
り、金型を閉じると、ボビン７の上端面の３つの尖突部
２６が、テーパ孔２７の斜面に案内されながら該テーパ
孔２７に嵌入し、金型１９・２０内に於ける感応素子部
２の心ずれが補正され、かつ感応素子部２が金型１９・
２０内に確実に固定される。ここで尖突部２６の台座２
９の上面には平坦面が形成されており、尖突部２６がテ
ーパ孔２７に嵌入した後は、位置決め突部２８の下面が
台座２９の上面を押圧して軸線方向の位置決めがなされ
るようになっている。従って、上型２０を閉じた状態で
尖突部２６の先端には押圧力が作用しない。On the other hand, on the upper end surface of the bobbin 7, three sharp protrusions 26 having sharp tips are projected at equal intervals in the circumferential direction. Correspondingly, three positioning projections 28 are formed on the inner surface of the upper mold 20 so as to have tapered holes 27 that can receive the pointed projections 26 in a complementary manner. Thus, when the mold is closed, the three pointed projections 26 on the upper end surface of the bobbin 7 are fitted into the tapered holes 27 while being guided by the slopes of the tapered holes 27, and the sensitivity in the molds 19 and 20 is increased. The misalignment of the element 2 is corrected, and the sensitive element 2 is
It is securely fixed in the inside 20. Here, the pedestal 2 of the pointed projection 26
9 is formed with a flat surface, and after the pointed protrusion 26 is fitted into the tapered hole 27, the lower surface of the positioning protrusion 28 presses the upper surface of the pedestal 29 so that positioning in the axial direction is performed. It has become. Therefore, no pressing force acts on the tip of the pointed projection 26 with the upper mold 20 closed.
【００１６】ところで、樹脂射出用ゲート２１は、感応
素子部２の中心線上に位置するように上型２０に設けら
れている。そのためゲート２１から射出された溶融樹脂
は、感応素子部２の外周の全方向へ向けて均一に流れ込
み、最終的に感応素子部２の全周を被覆する。ここで尖
突部２６の台座２９は、図６に示すように、半径方向外
側へ向けて周方向寸法が漸減する形状とされているの
で、矢印で示す如く溶融樹脂は台座２９のゲート２１か
ら遠い側の面にも円滑に流れ込む。従って、同部分にエ
ア溜まりが生ずることが無いので、ウェルドマークの発
生を防止できる。また溶融樹脂は、複数の突部２４にて
形成されたボビン７のフランジ２５の下面と下型１９の
底面との間の空隙Ｇ１及び複数の延出部２２同士間の空
隙Ｇ２を経てポールピース１０の先端１０ａの方へも流
れ込み、ポールピース１０の先端部回りも樹脂モールド
される。Incidentally, the resin injection gate 21 is provided on the upper mold 20 so as to be located on the center line of the sensitive element section 2. Therefore, the molten resin injected from the gate 21 flows uniformly in all directions on the outer periphery of the sensitive element section 2, and finally covers the entire periphery of the sensitive element section 2. Here, as shown in FIG. 6, the pedestal 29 of the pointed projection 26 has a shape in which the circumferential dimension gradually decreases outward in the radial direction, so that the molten resin flows from the gate 21 of the pedestal 29 as indicated by the arrow. It flows smoothly into the far surface. Therefore, since no air accumulation occurs in the same portion, generation of a weld mark can be prevented. Further, the molten resin passes through the gap G1 between the lower surface of the flange 25 of the bobbin 7 formed by the plurality of protrusions 24 and the bottom surface of the lower mold 19 and the gap G2 between the plurality of extending portions 22 to form the pole piece. The resin also flows into the tip 10a of the pole piece 10 and the area around the tip of the pole piece 10 is also resin-molded.
【００１７】なお、図２に於ける金型１９・２０は、切
断端面のみが表されている。またポールピース１０を受
容する凹所２３の部分は、図４に於けるII−II線に沿う
断面が表されている。The dies 19 and 20 in FIG. 2 show only cut end faces. The section of the recess 23 for receiving the pole piece 10 has a cross section along the line II-II in FIG.
【００１８】[0018]
【発明の効果】このように本発明によれば、対金型位置
決め部の周囲を溶融樹脂が流れ易くなるので、同部分に
エア溜まりが生じ難くなる。従って、電磁センサをイン
サートモールド成形する際に、感応素子部と被覆部間の
密着性を高め、良好な防水性を得る上に大きな効果を奏
することができる。As described above, according to the present invention, since the molten resin easily flows around the positioning portion for the die, air accumulation is hardly generated in the same portion. Therefore, when the electromagnetic sensor is subjected to insert molding, the adhesion between the sensitive element portion and the covering portion is enhanced, and a great effect can be obtained in obtaining good waterproofness.
【図１】本発明による電磁センサの斜視図。FIG. 1 is a perspective view of an electromagnetic sensor according to the present invention.
【図２】感応素子部並びにカラーを金型内にセットした
状態を示す縦断面図。FIG. 2 is a longitudinal sectional view showing a state where a sensitive element portion and a collar are set in a mold.
【図３】感応素子部の要部斜視図。FIG. 3 is a perspective view of a main part of a sensitive element unit.
【図４】図２に於けるIV−IV線断面図。FIG. 4 is a sectional view taken along line IV-IV in FIG. 2;
【図５】金型内でモールド成形した状態を示す縦断面
図。FIG. 5 is a longitudinal sectional view showing a state in which molding is performed in a mold.
【図６】ボビンの一端面図。FIG. 6 is an end view of the bobbin.
【図７】従来技術の不都合を説明するための要部模式
図。FIG. 7 is a schematic diagram of a main part for describing inconvenience of the related art.
【符号の説明】 １ 電磁センサ ２ 感応素子部 ３ ハウジング部 ４ 取付ステー部 ５ ケーブル引出部 ６ 金属製カラー ７ ボビン ８ ターミナル部材 ９ コイル １０ ポールピース １１ 永久磁石 １２ ヨーク １３ リード線 １４ 導線 １５ 導線保持部 １６ リード線保持部 １７ 保持溝 １８ ケーブル押さえ １９ 下型 ２０ 上型 ２１ 樹脂射出用ゲート ２２ 軸線方向延出部 ２３ 凹所 ２４ 突部 ２５ フランジ ２６ 尖突部 ２７ テーパ孔 ２８ 位置決め突部 ２９ 台座[Description of Signs] 1 Electromagnetic sensor 2 Sensitive element section 3 Housing section 4 Mounting stay section 5 Cable lead-out section 6 Metal collar 7 Bobbin 8 Terminal member 9 Coil 10 Pole piece 11 Permanent magnet 12 Yoke 13 Lead wire 14 Lead wire 15 Lead wire holding Part 16 Lead wire holding part 17 Holding groove 18 Cable holding 19 Lower die 20 Upper die 21 Resin injection gate 22 Axial extension 23 Depression 24 Projection 25 Flange 26 Pointed projection 27 Tapered hole 28 Positioning projection 29 Base
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平７−311211（ＪＰ，Ａ) 特開 平５−312822（ＪＰ，Ａ) 特開 平７−27775（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01P 3/488 G01P 3/487 G01D 5/245 G01P 1/02 G01P 3/04 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-311211 (JP, A) JP-A-5-313822 (JP, A) JP-A-7-27775 (JP, A) (58) Survey Field (Int.Cl. 7 , DB name) G01P 3/488 G01P 3/487 G01D 5/245 G01P 1/02 G01P 3/04
Claims (2)
融樹脂を射出することによって前記感応素子部の周囲に
被覆部を形成するようにした電磁センサであって、 前記感応素子部の軸線方向一端面に前記金型と係合可能
な位置決め突起を突設し、 該位置決め突起のキャビティ内を臨む部分の形状を、樹
脂射出ゲート中心から離れるに従って樹脂の流線に直交
する向きの寸法が漸減するようにしたことを特徴とする
電磁センサ。1. An electromagnetic sensor in which a sensitive element section is inserted into a mold and a molten resin is injected to form a coating section around the sensitive element section, wherein an axis of the sensitive element section is provided. A positioning protrusion that can be engaged with the mold is projected on one end surface in the direction, and the shape of a portion of the positioning protrusion facing the inside of the cavity has a dimension perpendicular to a resin streamline as the distance from the center of the resin injection gate increases. An electromagnetic sensor characterized by gradually decreasing.
とする共通の円周上に互いに周方向に離間して複数設け
られることを特徴とする請求項１に記載の電磁センサ。2. The electromagnetic sensor according to claim 1, wherein a plurality of the positioning projections are provided on a common circumference centered on the gate and are spaced apart from each other in a circumferential direction.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33597695A JP2999407B2 (en) | 1995-11-30 | 1995-11-30 | Electromagnetic sensor |
| GB9624496A GB2307661B (en) | 1995-11-30 | 1996-11-26 | Electromagnetic sensor and moulding die used for manufacturing the same |
| KR1019960058846A KR100216115B1 (en) | 1995-11-30 | 1996-11-28 | Electromagnetic sensor and moulding die used for manufacturing the same |
| US08/757,666 US5871681A (en) | 1995-11-30 | 1996-11-29 | Electromagnetic sensor and molding method for manufacturing the same |
| DE19649820A DE19649820C2 (en) | 1995-11-30 | 1996-12-02 | Method of manufacturing an electromagnetic sensor and sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33597695A JP2999407B2 (en) | 1995-11-30 | 1995-11-30 | Electromagnetic sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09152440A JPH09152440A (en) | 1997-06-10 |
| JP2999407B2 true JP2999407B2 (en) | 2000-01-17 |
Family
ID=18294417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33597695A Expired - Fee Related JP2999407B2 (en) | 1995-11-30 | 1995-11-30 | Electromagnetic sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2999407B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6344043B2 (en) * | 2014-05-09 | 2018-06-20 | アイシン精機株式会社 | Sensor |
-
1995
- 1995-11-30 JP JP33597695A patent/JP2999407B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09152440A (en) | 1997-06-10 |
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