JPH07140157A - Wheel speed sensor - Google Patents

Abstract

PURPOSE:To manufacture a compact and robust sensor easily at low cost by previously securing functional components, e.g. a magnet, core, and terminal, integrally through resin molding and limiting the terminal to only one type thereby saving the manufacturing cost and the material cost. CONSTITUTION:A bobbin 4 is resin molded while incorporating a magnet 2 and a core 3. A winding coil 5 is wound around a spool part formed under it. The integrally molded functional components are inserted into the housing 1 having substantially identical inner diameter as the resin molded bobbin 4 and the functional components are inserted tightly into the housing 1. The housing 1 is made of a nonmagnetic metal. The terminal 6a projecting from the resin molded part of the bobbin 4 is connected with an output line 7 which is secured, at its outer periphery, by the second resin molded part 8 and a fixing bracket 9 is bonded integrally.

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、自動車車輪などの回
転体の回転数や回転速度を検知するための車輪速センサ
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel speed sensor for detecting the rotation speed and rotation speed of a rotating body such as an automobile wheel.

【０００２】[0002]

【従来の技術】回転体の回転速度等を検知する車輪速セ
ンサに採用される回転検出方式には、例えば電磁発電方
式、磁気抵抗素子あるいはホール素子を使用する方式等
種々のものが知られている。かかる車輪速センサは一般
に車輪支持部等の適宜位置に取り付けられ、車輪と共に
回転し車輪速センサに回転出力を誘起させるためのセン
サロータ（エキサイタとも呼ばれる）と対にして用いら
れる。2. Description of the Related Art Various types of rotation detection methods are known, such as an electromagnetic power generation method and a method using a magnetoresistive element or a Hall element, which are adopted in a wheel speed sensor for detecting the rotational speed of a rotating body. There is. Such a wheel speed sensor is generally attached to an appropriate position such as a wheel support portion, and is used as a pair with a sensor rotor (also called an exciter) for rotating with the wheel to induce a rotation output in the wheel speed sensor.

【０００３】上記種々の方式による従来の車輪速センサ
のうち電磁発電方式のものは、一般に非磁性体の筒状ハ
ウジング内に設けられる磁石、鉄心、ポールピース、上
記鉄心の外周に嵌合されるボビンの上に巻かれた巻線コ
イルなどから成り、一例として実開昭６３−１８３５１
１号公報のものを示す。Among the conventional wheel speed sensors of the various types described above, those of the electromagnetic power generation type are generally fitted in a magnet, an iron core, a pole piece, and the outer circumference of the iron core provided in a non-magnetic cylindrical housing. It consists of a wound coil wound on a bobbin, and as an example, the actual open sho 63-18351.
The thing of the gazette of No. 1 is shown.

【０００４】図示のものはポールピース突出形であり、
１はハウジング、２は磁石、３は鉄心、４はボビン、５
は巻線コイル、６はポールピースである。樹脂成形品の
ボビン４には端子が圧入され、これに出力線７を接続し
て第１の樹脂部８ａで覆うと共にボビン４のつば部の間
に巻線コイル５が巻かれその端が端子に接続され、ボビ
ン４の中空部には磁石２や鉄心３がセットされ、これら
をハウジング内に挿入した後上部を第２の樹脂部８ｂで
封止している。９は取付用ブラケットである。The one shown is a pole piece protruding type,
1 is a housing, 2 is a magnet, 3 is an iron core, 4 is a bobbin, 5
Is a winding coil, and 6 is a pole piece. A terminal is press-fitted into the bobbin 4 of the resin molded product, the output line 7 is connected to the bobbin 4 and is covered with the first resin portion 8a, and the winding coil 5 is wound between the flange portions of the bobbin 4 and the end thereof is the terminal. , The magnet 2 and the iron core 3 are set in the hollow portion of the bobbin 4, and after inserting them into the housing, the upper portion is sealed with the second resin portion 8b. Reference numeral 9 is a mounting bracket.

【０００５】このように配置構成した車輪速センサに対
して、回転体の回転によりセンサロータが回転すると、
その回転により鉄心を貫く磁気の大きさが変化し、巻線
コイルの両端に交流電圧が発生する。この交流電圧は出
力線から出力され、図示省略の検出回路における二値化
回路によりパルス信号として検出され、このパルス信号
を計数することにより回転速度等が得られる。With respect to the wheel speed sensor thus arranged, when the sensor rotor rotates due to the rotation of the rotating body,
The rotation changes the magnitude of the magnetism that penetrates the iron core, generating an AC voltage across the winding coil. This AC voltage is output from the output line, detected as a pulse signal by a binarization circuit in a detection circuit (not shown), and the rotational speed or the like is obtained by counting the pulse signal.

【０００６】[0006]

【発明が解決しようとする課題】しかし、上記公報によ
る従来例に限らず、一般に車輪速センサは磁石、鉄心な
どの機能部品をハウジングに挿入した後これら機能部品
を固定するため樹脂をハウジング内に流し込むようにし
ており、この余分な工程がコストアップとなっていた。However, the wheel speed sensor is not limited to the conventional example according to the above publication, but in general, a wheel speed sensor inserts functional components such as a magnet and an iron core into the housing and then fixes the functional components such as resin inside the housing. Since it is poured, this extra process increases the cost.

【０００７】そこで、このような樹脂をハウジング内に
注入しない構成のものとして、例えば特開平５−６０７
７２号公報の車輪速センサが提案されている。この公報
による車輪速センサは、磁石、鉄心、端子などを樹脂成
形により予め一体に保持固定し、上記端子に別の端子を
接続し、さらに出力線を接続したものをハウジングの中
心軸と平行な方向に設けた上部ハウジング内の溝に突出
する端子を折り込んだ状態で挿入し固定する構成として
いる。Therefore, as a structure in which such a resin is not injected into the housing, for example, Japanese Patent Laid-Open No. 5-607 is used.
The wheel speed sensor of Japanese Patent No. 72 has been proposed. In the wheel speed sensor according to this publication, magnets, iron cores, terminals and the like are integrally held and fixed in advance by resin molding, another terminal is connected to the above terminal, and an output line is connected to the wheel parallel to the central axis of the housing. The terminal protruding in a groove provided in the upper direction is inserted and fixed in a folded state.

【０００８】しかし、このような車輪速センサではコイ
ルと出力線を結ぶ端子が２種類あるため材料費あるいは
端子と電線を接続する工程が複雑となり加工費が高くな
るなどの問題があり、必ずしも満足なものではない。However, in such a wheel speed sensor, there are two types of terminals for connecting the coil and the output line, so that there is a problem that the material cost or the process of connecting the terminal and the electric wire becomes complicated and the processing cost becomes high. It's not something.

【０００９】この発明は、上記従来の車輪速センサの問
題点に留意して、磁石、鉄心、端子などの機能部品を予
め樹脂成形により一体に固定してハウジングに収納する
ようにして収納後にハウジング内に固定用の樹脂の流し
込みを不要とし、端子の種類を一種類として加工費、材
料費の節約を図り、コンパクトでコストの安い、かつ故
障の少ない製作の容易な車輪速センサを得ることを課題
とする。In view of the above-mentioned problems of the conventional wheel speed sensor, the present invention fixes functional parts such as magnets, iron cores, terminals, etc. in advance by resin molding, and stores them in the housing. It is possible to obtain a compact, low-cost, easy-to-manufacture wheel speed sensor that does not require fixing resin to be poured into it, saves processing costs and material costs by using only one type of terminal. It is an issue.

【００１０】[0010]

【課題を解決するための手段】上記課題を解決する手段
としてこの発明は、磁石、鉄心、端子を含む機能部品を
樹脂成形品で一体に形成し、上記端子は樹脂成形品から
半径方向に突出する突出端を有し、樹脂成形品の端に巻
装したコイル巻線の両端をそれぞれの端子の突出端に接
続した後突出端を樹脂成形品の直径内に折り曲げ、これ
らをハウジングに収納して出力線を端子に接続すると共
にその外周を第二の樹脂成形部で覆い一体に成形して成
る車輪速センサとしたのである。As a means for solving the above problems, according to the present invention, a functional component including a magnet, an iron core and a terminal is integrally formed by a resin molded product, and the terminal is projected from the resin molded product in a radial direction. After connecting the both ends of the coil winding wound around the end of the resin molded product to the protruding ends of the terminals, bend the protruding ends within the diameter of the resin molded product and store them in the housing. The output line is connected to the terminal, and the outer periphery of the output line is covered with the second resin molding portion to integrally form the wheel speed sensor.

【００１１】[0011]

【作用】上記の構成としたこの発明の車輪速センサは、
従来と同様にセンサロータが回転すると出力線から車輪
速信号を出力する。The wheel speed sensor of the present invention having the above structure is
When the sensor rotor rotates, the wheel speed signal is output from the output line as in the conventional case.

【００１２】この車輪速センサを組立てる際には、予め
磁石、鉄心、端子などの機能部品を樹脂成形で一体に固
定しているから、ハウジング収納後に機能部品を樹脂で
固定する必要がない。又、固定されている端子の突出端
子に巻線コイル両端は接続されるから、端子の種類は１
種類でよく、突出端子を折り曲げることによりコンパク
トになる。When assembling this wheel speed sensor, the functional parts such as magnets, iron cores, terminals, etc. are integrally fixed in advance by resin molding, so there is no need to fix the functional parts with resin after housing. Moreover, since both ends of the winding coil are connected to the protruding terminal of the fixed terminal, the type of terminal is 1
It can be of any type, and it can be made compact by bending the protruding terminals.

【００１３】[0013]

【実施例】以下この発明の実施例について図面を参照し
て説明する。図１は実施例の車輪速センサの主要断面図
である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a main sectional view of a wheel speed sensor of the embodiment.

【００１４】１はハウジング、２は磁石、３は鉄心、４
はボビン、５は巻線コイル、６は端子、７は出力線、８
は第２の樹脂成形部、９は取付用ブラケットである。ボ
ビン４は、その内部に磁石２、鉄心３を含んで樹脂成形
により一体に形成されている。又その下方に一体に形成
されたスプール部に巻線コイル５が巻装されている。1 is a housing, 2 is a magnet, 3 is an iron core, 4
Is a bobbin, 5 is a winding coil, 6 is a terminal, 7 is an output line, 8
Is a second resin molding portion, and 9 is a mounting bracket. The bobbin 4 is integrally formed by resin molding including the magnet 2 and the iron core 3 inside. Further, a winding coil 5 is wound around a spool portion integrally formed below the spool portion.

【００１５】上記一体に形成された機能部品はハウジン
グ１内に挿入されるが、ハウジング１はボビン４の樹脂
成形品とほぼ同じ内径であり、機能部品はハウジング内
に密封状に挿入される。ハウジング１は非磁性体金属
（ステンレス）から成る。The functional component integrally formed is inserted into the housing 1. The housing 1 has substantially the same inner diameter as the resin molded product of the bobbin 4, and the functional component is hermetically inserted into the housing. The housing 1 is made of non-magnetic metal (stainless steel).

【００１６】ボビン４の樹脂成形部より突出する突出端
子６ａには出力線７が接続され、その外周を第２の樹脂
成形部８で固定し、取付用ブラケット９を一体に接合す
る。The output wire 7 is connected to the protruding terminal 6a protruding from the resin molding portion of the bobbin 4, the outer periphery of which is fixed by the second resin molding portion 8 and the mounting bracket 9 is integrally joined.

【００１７】図２に組立途中の機能部品の概略を示す。
（ａ）に示すように、磁石２、鉄心３はボビン４の樹脂
成形体の内側に一体に成形されている。突出端子６ａ
は、（ａ）に示すようにボビン４の直径より外方へ突出
している。（ｂ）は（ａ）図の矢視Ａ−Ａから見た断面
図である。FIG. 2 shows an outline of functional parts in the process of assembly.
As shown in (a), the magnet 2 and the iron core 3 are integrally molded inside the resin molded body of the bobbin 4. Protruding terminal 6a
Protrudes outward from the diameter of the bobbin 4 as shown in (a). (B) is sectional drawing seen from the arrow AA of (a) figure.

【００１８】突出端子６ａには、ボビン４の下端に巻装
された巻線コイル５の両端が接続され、その後（ｂ）に
示すようにボビン４の直径内に水平に折り曲げられる。Both ends of a winding coil 5 wound around the lower end of the bobbin 4 are connected to the projecting terminal 6a, and thereafter, the winding coil 5 is horizontally bent within the diameter of the bobbin 4 as shown in (b).

【００１９】なお、突出端子６ａは上記のように水平に
折り曲げる以外に上下いずれかの方向に折り曲げてもよ
い。The protruding terminal 6a may be bent in any of the upper and lower directions, instead of being bent horizontally as described above.

【００２０】上記構成の樹脂の車輪速センサは、作用と
しては従来のものと同様にセンサロータの回転によって
車輪速信号を出力線より送り出す。しかし、この実施例
の車輪速センサは、機能部品がボビン４の樹脂で一体に
予め成形されているから、単に一体の機能部品をハウジ
ング１に収納するだけでハウジング１内に機能部品を固
定するために樹脂を流し込む必要はなく、上部の第二の
樹脂成形部８を固めるだけでよい。The operation of the resin wheel speed sensor having the above-mentioned construction is similar to that of the conventional one, and sends out the wheel speed signal from the output line by the rotation of the sensor rotor. However, in the wheel speed sensor of this embodiment, since the functional parts are integrally molded in advance with the resin of the bobbin 4, the functional parts are fixed in the housing 1 simply by housing the integrated functional parts in the housing 1. Therefore, it is not necessary to pour the resin in, and it is sufficient to solidify the second resin molding portion 8 on the upper side.

【００２１】従って、製作の手間が効率化され、特別な
材料の端子部品もなく最小限の部品点数で組立てされ
る。Therefore, the time and effort required for production are improved, and there is no terminal part made of a special material, and the parts are assembled with a minimum number of parts.

【００２２】[0022]

【効果】以上詳細に説明したように、この発明の車輪速
センサは樹脂成形により磁石、鉄心、端子を一体に固定
し下端に巻装した巻線コイルの両端を突出端子に接続し
てこれを折り曲げハウジング内に収納するようにしたか
ら、機能部品の固定用にハウジング内に収納した際に樹
脂を流し込む必要がなく、巻線コイルの両端は１種類の
端子を使用するだけでよく材料費、加工費が少なくて済
み、突出端子は折り曲げる構造としているためサイズが
コンパクトに出来るなどの種々の利点を有し、故障の少
ない、経済的で製造の容易な車輪速センサが得られる。As described above in detail, in the wheel speed sensor of the present invention, the magnet, the iron core, and the terminal are integrally fixed by resin molding, and both ends of the winding coil wound around the lower end are connected to the projecting terminal. Since it is housed in a folded housing, there is no need to pour resin when housing it for fixing functional parts, and it is sufficient to use only one type of terminal for both ends of the winding coil. The processing cost is low, and since the protruding terminal has a structure in which it is bent, it has various advantages such as being compact in size, and it is possible to obtain an economical and easy-to-manufacture wheel speed sensor with few failures.

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

【図１】実施例の車輪速センサの主要断面図FIG. 1 is a main sectional view of a wheel speed sensor according to an embodiment.

【図２】同上の機能部品の組立途中の概略図FIG. 2 is a schematic diagram during the assembling of the above functional parts.

【図３】従来例の車輪速センサの主要断面図FIG. 3 is a main sectional view of a conventional wheel speed sensor.

【符号の説明】[Explanation of symbols]

１ ハウジング ２ 磁石 ３ 鉄心 ４ ボビン ５ 巻線コイル ６ 端子 ７ 出力線 ８ 第２の樹脂成形部 ９ 取付用ブラケット 1 Housing 2 Magnet 3 Iron Core 4 Bobbin 5 Winding Coil 6 Terminal 7 Output Line 8 Second Resin Molding Section 9 Mounting Bracket

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 磁石、鉄心、端子を含む機能部品を樹脂
成形品で一体に形成し、上記端子は樹脂成形品から半径
方向に突出する突出端を有し、樹脂成形品の端に巻装し
たコイル巻線の両端をそれぞれの端子の突出端に接続し
た後突出端を樹脂成形品の直径内に折り曲げ、これらを
ハウジングに収納して出力線を端子に接続すると共にそ
の外周を第二の樹脂成形部で覆い一体に成形して成る車
輪速センサ。1. A functional component including a magnet, an iron core and a terminal is integrally formed of a resin molded product, and the terminal has a projecting end projecting from the resin molded product in a radial direction and is wound around the end of the resin molded product. After connecting both ends of the coil winding to the projecting ends of each terminal, bend the projecting ends within the diameter of the resin molded product and store them in the housing to connect the output wire to the terminals and to connect the outer circumference to the second A wheel speed sensor that is integrally molded with a resin molding part.