JPS60256064A - Speed detector for car - Google Patents
Speed detector for carInfo
- Publication number
- JPS60256064A JPS60256064A JP11346684A JP11346684A JPS60256064A JP S60256064 A JPS60256064 A JP S60256064A JP 11346684 A JP11346684 A JP 11346684A JP 11346684 A JP11346684 A JP 11346684A JP S60256064 A JPS60256064 A JP S60256064A
- Authority
- JP
- Japan
- Prior art keywords
- rotating body
- rotor
- reed switch
- vehicle speed
- speed
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/484—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by contact-making switches
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
【発明の詳細な説明】 〔発明の技術分野〕 本発明は、自動車用車速検出器の改良に関する。[Detailed description of the invention] [Technical field of invention] The present invention relates to improvements in vehicle speed detectors for automobiles.
従来のこの種の検出器は、第２図及び第３図に示すよう
に、スピードメータケーブル１に固定されている回転体
２の周面に複数の磁石３を設け。As shown in FIGS. 2 and 3, a conventional detector of this kind has a plurality of magnets 3 provided on the circumferential surface of a rotating body 2 fixed to a speedometer cable 1.
回転体２の周面近傍にリードスイッチ４が配された構造
を有している。It has a structure in which a reed switch 4 is arranged near the circumferential surface of the rotating body 2.
次に、第２図及び第３図に示す検出器の動作を説明する
。Next, the operation of the detector shown in FIGS. 2 and 3 will be explained.
即ち、スピードメータケーブル１が車速に対応した速度
で回転すると、回転体２もそれに伴って矢印方向に回転
し、回転体２周面の磁石３がリードスイッチ４への接近
及び離隔を繰り返す、従って、リードスイッチ４の周囲
で磁石３の接近及び離隔で磁界が変化し、この磁界変化
によりリードスイッチ４が開閉動作を行うので、該スイ
ッチ４からの断続的な周波数で車速を検出することがで
きる。That is, when the speedometer cable 1 rotates at a speed corresponding to the vehicle speed, the rotating body 2 also rotates in the direction of the arrow, and the magnet 3 on the circumferential surface of the rotating body 2 repeatedly approaches and separates from the reed switch 4. The magnetic field changes as the magnet 3 approaches and separates around the reed switch 4, and the reed switch 4 opens and closes due to this magnetic field change, so the vehicle speed can be detected with the intermittent frequency from the switch 4. .
このような構造の検出器において、スピードメータケー
ブルには低速時や停止直前等のエンジントルクの変動に
より捩れが発生する。そして、このようにスピードメー
タケーブルに捩れが生じると、回転体２が矢印方向及び
その逆方向に連続的に回動し、磁石３がリードスイッチ
４近傍で往復動じてしまうので、リードスイッチ４にチ
ャタリングが発生し、正確な車速を検出することができ
ないという不都合があった。In a detector having such a structure, twisting occurs in the speedometer cable due to fluctuations in engine torque at low speeds or just before stopping. When the speedometer cable is twisted in this way, the rotating body 2 rotates continuously in the direction of the arrow and in the opposite direction, and the magnet 3 moves back and forth near the reed switch 4. There was an inconvenience that chattering occurred and accurate vehicle speed could not be detected.
本発明は、上記し、た点に鑑みてなされたもので、正確
に車速を検出できる自動車用車速検出器を提供すること
を目的とし、スピードメータケーブルに第１の回転体を
、取付け、その外側に磁石を有する第２の回転体を一方
向にのみ回転可能に配し、第１の回転体のスピードメー
タケーブルによる回転力を突起相互の係合で第２の回転
体に伝達することを特徴とする。The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a vehicle speed detector for an automobile that can accurately detect vehicle speed. A second rotating body having a magnet on the outside is arranged so as to be rotatable in only one direction, and the rotational force from the speedometer cable of the first rotating body is transmitted to the second rotating body by mutual engagement of the protrusions. Features.
以下、本発明の一実施例を図面に基づいて詳細に説明す
る。Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.
本発明に係る自動車用車速検出器は、第１図に示すよう
に、スピードメータケーブルｌを備え。The vehicle speed detector for an automobile according to the present invention includes a speedometer cable l, as shown in FIG.
このスピードメータケーブルｌに第１の回転体５が固定
されている。この回転体５の周面には突起５ａが設けら
れている０回転体５の周面上には同軸的に第２の回転体
６が配されている。この第２の回転体６は外周面に複数
の磁石３が設けられ、その内周面に前記突起５ａと係合
するための突起６ａが設けられている。そして、この第
２の回転体６は一方向にのみ、即ち矢印方向にのみ回転
可能に支持されている。第２の回転体の外周面近傍位置
にはリードスイッチ４が配設されている。A first rotating body 5 is fixed to this speedometer cable l. A second rotating body 6 is disposed coaxially on the circumferential surface of the zero-rotating body 5, on which a protrusion 5a is provided. The second rotating body 6 has a plurality of magnets 3 on its outer peripheral surface, and has a projection 6a on its inner peripheral surface for engaging with the projection 5a. The second rotating body 6 is rotatably supported only in one direction, that is, only in the direction of the arrow. A reed switch 4 is disposed near the outer peripheral surface of the second rotating body.
次に、本発明の検出器の動作を説明する。Next, the operation of the detector of the present invention will be explained.
即ち、スピードメータケーブルｌが車速に対応して駆動
され、第１の回転体５が矢印方向に回転すると、この第
１の回転体５の突起５ａが第２の回転体６の突起６ａと
係合するので、第２の回転体６も矢印方向に回転する。That is, when the speedometer cable l is driven in accordance with the vehicle speed and the first rotating body 5 rotates in the direction of the arrow, the protrusion 5a of the first rotating body 5 engages with the protrusion 6a of the second rotating body 6. Therefore, the second rotating body 6 also rotates in the direction of the arrow.
従って、第２の回転体６の外周面の磁石３がリードスイ
ッチ４に対して車速に対応した速度で接近又は離隔する
ので、リードスイッチ４が車速に応じて断続的に開閉し
、車速検出信号を出力する。Therefore, the magnet 3 on the outer peripheral surface of the second rotating body 6 approaches or moves away from the reed switch 4 at a speed corresponding to the vehicle speed, so the reed switch 4 intermittently opens and closes depending on the vehicle speed, and the vehicle speed detection signal is Output.
さて、車の停止直前にエンジントルク等が変動してスピ
ードメータケーブルｌに捩れ振動が生じると、＄１の回
転体５は矢印方向及びその逆方向への回動動作を繰り返
すが、第２の回転体６は一方向（矢印方向）にのみ回転
可能に支持されているので、第１の回転体５が回動動作
を繰り返しても回転することがない、従って、磁石３も
定位置に位置決めされ、変位しないので、リードスイッ
チ４にチャタリングが生じない、よって、正確な車速検
出信号が得られる。Now, when the engine torque etc. fluctuate just before the car stops and torsional vibration occurs in the speedometer cable l, the rotating body 5 of $1 repeatedly rotates in the direction of the arrow and in the opposite direction. Since the rotating body 6 is supported so as to be rotatable only in one direction (the direction of the arrow), it will not rotate even if the first rotating body 5 repeats the rotational movement. Therefore, the magnet 3 is also positioned at a fixed position. Since the reed switch 4 is not displaced, chattering does not occur in the reed switch 4, and an accurate vehicle speed detection signal can be obtained.
上記実施例において、第１及び第２の回転体５．６をワ
ンウェイクラッチ構造にするのが好ましい。In the above embodiment, it is preferable that the first and second rotating bodies 5.6 have a one-way clutch structure.
以上説明したように、本発明によれば、スピードメータ
ケーブルに固定した第１の回転体により一方向にのみ回
転可能に支持した第２の回転体を回転させてＭ４２の回
転体の外周面における磁石の接近及び離隔にてリードス
イッチを開閉動作させたことで、スピードメータケーブ
ルに捩れ振動が生じてもリードスイッチにチャタリング
が発生することがなく、従って、正確に車速を検出する
ことができる。As explained above, according to the present invention, the second rotating body, which is rotatably supported in only one direction, is rotated by the first rotating body fixed to the speedometer cable, and the outer peripheral surface of the M42 rotating body is rotated. By opening and closing the reed switch as the magnet approaches and separates, chattering does not occur in the reed switch even if torsional vibration occurs in the speedometer cable, so vehicle speed can be accurately detected.
第１図は本発明に係る自動車用車速検出器の正面図、第
２図及び第３図は従来の自動車用車速検出器の正面図と
側断面図である。
１−−−−−スピードメータケーブル、２．５．６−−
−−−回転体、３−−−−一磁石、４−−−−−リード
スイッチ、５ａ、６ａ−−一一一突起。
尚、図中同一符号は、同−又は相当部分を示す。
代理人大岩増雄
第１図
第２図
第３図
■−４FIG. 1 is a front view of a vehicle speed detector for an automobile according to the present invention, and FIGS. 2 and 3 are a front view and a side sectional view of a conventional vehicle speed detector for an automobile. 1---Speedometer cable, 2.5.6---
---Rotating body, 3-----1 magnet, 4-----Reed switch, 5a, 6a--111 protrusion. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3 ■-4
Claims (1)
スピードメータケーブルに取付けられて該ケーブルと共
に回転し、周面に突起を有する第１の回転体と、該回転
体の周面上に同軸的に配され、かつ外周面に複数の磁石
が設けられ、内周面に前記第１の回転体と共に回転すべ
く前記突起と当接する係合突起が設けられている第２の
回転体と、該第２の回転体の回転速度に対応する前記磁
石の接近及び離隔で断続的に開閉して車速検出信号を出
力するリードスイッチとを備え、前記第２の回転体は一
方向へのみ回転可能に支持されていることを特徴とする
自動車用車速検出器。a speedometer cable that rotates in accordance with vehicle speed; a first rotating body that is attached to the speedometer cable and rotates together with the cable and has a protrusion on its circumference; and a first rotating body that is coaxially mounted on the circumferential surface of the rotating body. a second rotating body which is arranged and has a plurality of magnets on its outer circumferential surface, and has an engaging protrusion on its inner circumferential surface that comes into contact with the protrusion so as to rotate together with the first rotating body; and a reed switch that outputs a vehicle speed detection signal by intermittently opening and closing as the magnets approach and separate in accordance with the rotational speed of the second rotating body, and the second rotating body is supported so as to be rotatable in only one direction. A vehicle speed detector for an automobile, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11346684A JPS60256064A (en) | 1984-05-31 | 1984-05-31 | Speed detector for car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11346684A JPS60256064A (en) | 1984-05-31 | 1984-05-31 | Speed detector for car |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60256064A true JPS60256064A (en) | 1985-12-17 |
Family
ID=14612957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11346684A Pending JPS60256064A (en) | 1984-05-31 | 1984-05-31 | Speed detector for car |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60256064A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7940041B2 (en) * | 2006-07-06 | 2011-05-10 | General Electric Company | Method of determining the amount of travel of a rotating component |
-
1984
- 1984-05-31 JP JP11346684A patent/JPS60256064A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7940041B2 (en) * | 2006-07-06 | 2011-05-10 | General Electric Company | Method of determining the amount of travel of a rotating component |
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