JPH05322676A - Torque detecting apparatus - Google Patents
Torque detecting apparatusInfo
- Publication number
- JPH05322676A JPH05322676A JP3055097A JP5509791A JPH05322676A JP H05322676 A JPH05322676 A JP H05322676A JP 3055097 A JP3055097 A JP 3055097A JP 5509791 A JP5509791 A JP 5509791A JP H05322676 A JPH05322676 A JP H05322676A
- Authority
- JP
- Japan
- Prior art keywords
- torque
- shaft member
- rotary shaft
- magnetic heads
- phase difference
- 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.)
- Withdrawn
Links
Landscapes
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車等の動力伝達軸
のような回転軸部材に作用するトルクを検出するための
トルク検出装置に関し、特に、回転軸部材のねじれ量か
らトルクを算出するトルク検出装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque detecting device for detecting a torque acting on a rotary shaft member such as a power transmission shaft of an automobile or the like, and more particularly to calculating the torque from the twist amount of the rotary shaft member. The present invention relates to a torque detection device.
【０００２】[0002]
【従来の技術】近年、自動車等におけるトルク検出の必
要性は増大しつつある。特に、四輪駆動における前後輪
のトルク配分においては、走行状態に対する特性曲線を
設定し、推定による間接的な制御手段を用いており、車
両による特性のばらつき等に伴いその精度は必ずしも十
分なものとはいえない。同様な問題は、自動変速機をは
じめとする出力軸を有する車両の各機構部においても生
じている。2. Description of the Related Art In recent years, the need for torque detection in automobiles has been increasing. Especially, in the torque distribution of the front and rear wheels in four-wheel drive, an indirect control means by setting a characteristic curve with respect to the running state is used, and its accuracy is not always sufficient due to variations in characteristics depending on the vehicle. Not really. Similar problems occur in each mechanical portion of a vehicle having an output shaft such as an automatic transmission.
【０００３】これに対し、回転軸部材に作用するトルク
を直接検出するようにしたトルク検出装置として、トル
クの負荷による回転軸部材のねじれ角を測定し、そのね
じれ角からトルクを求める装置が、従来より広く知られ
ている。より具体的には、測定対象である回転軸部材に
少なくとも２つのロータリーエンコーダを配設したもの
が知られている。すなわち、個々のエンコーダからの検
出信号の位相差Δｔからねじれ角を求め、トルクに換算
するというものである。On the other hand, as a torque detecting device for directly detecting the torque acting on the rotary shaft member, a device for measuring the twist angle of the rotary shaft member due to the torque load and obtaining the torque from the twist angle is known. It is widely known in the past. More specifically, it is known that at least two rotary encoders are arranged on the rotary shaft member to be measured. That is, the twist angle is obtained from the phase difference Δt of the detection signal from each encoder and converted into torque.
【０００４】[0004]
【発明が解決しようとする課題】上記エンコーダの種類
としては、光学的手段を用いたもの、磁気的手段を用い
たものがあるが、これらを自動車用等のトルク検出装置
に適用するには、いずれの手段も、ねじれを検出するた
めに回転軸部材にスリット、歯車等を設ける必要があ
り、装置が大きく重くなると共に、構造上組付けの精度
を要し、また回転軸部材にねじれ歪が残留して蓄積され
ることによって２つのエンコーダの相対位置が徐々にず
れてしまい、トルク検出精度が経時劣化するという問題
がある。As the types of the encoder, there are a type using an optical means and a type using a magnetic means. To apply these to a torque detecting device for an automobile, etc., In any means, it is necessary to provide the rotary shaft member with slits, gears, etc. in order to detect the twist, the device becomes large and heavy, and the structural assembling accuracy is required. There is a problem in that the relative positions of the two encoders are gradually displaced due to the residual accumulation, and the torque detection accuracy deteriorates over time.
【０００５】上記以外にも、回転軸部材のねじれに基づ
いてトルクを検出する方法としては、歪により電気抵抗
が変化する歪ゲージを用いる歪ゲージ式、応力の作用に
より磁化が変化する磁歪効果を用いる磁歪式等がある
が、歪ゲージ式においては歪ゲージの接着方法や信号取
り出し方法に問題があり、磁歪式においては回転軸に磁
歪材料を接着したり、軸そのものに加工を施さなければ
ならないという問題がある。In addition to the above, as a method of detecting the torque based on the twist of the rotary shaft member, a strain gauge method using a strain gauge whose electric resistance changes by strain, a magnetostriction effect of changing magnetization by the action of stress are used. Although there are magnetostrictive type etc. used, there are problems in the strain gauge bonding method and signal extraction method in the strain gauge type, and in the magnetostrictive type it is necessary to bond the magnetostrictive material to the rotating shaft and to process the shaft itself There is a problem.
【０００６】本発明はこのような事情に鑑みてなされた
ものであって、小型で簡単な構成とすることができ、か
つ、取付作業や経年変化によりトルク検出誤差が生じる
のを防止することのできるトルク検出装置を提供するこ
とを目的とするものである。The present invention has been made in view of the above circumstances, and it is possible to make the structure small and simple, and to prevent a torque detection error from occurring due to mounting work or aging. An object of the present invention is to provide a torque detection device that can be used.
【０００７】[0007]
【課題を解決するための手段】本発明に係るトルク検出
装置は、動力伝達軸等の回転軸部材には一般に構造用鋼
が用いられ、この構造用鋼は磁性材料であることに鑑
み、この回転軸部材自体の磁気特性を利用した記録再生
によりトルク検出を行うようにしたものである。In the torque detecting device according to the present invention, structural steel is generally used for a rotary shaft member such as a power transmission shaft, and the structural steel is a magnetic material. The torque is detected by recording / reproducing using the magnetic characteristics of the rotating shaft member itself.
【０００８】すなわち、本発明に係るトルク検出装置
は、磁性材料からなる回転軸部材に作用するトルクを検
出するトルク検出装置であって、◆ 前記回転軸部材の周面に近接して該回転軸部材の軸線方
向に所定間隔をおいて配置された１組の磁気ヘッドと、
◆ これら各磁気ヘッドを介して前記回転軸部材に位置信号
を記録する記録手段と、◆ 前記各磁気ヘッドを介して再生された位置信号相互間の
位相差を検出する位相差検出手段と、◆ この位相差検出手段により検出された位相差に基づい
て、前記回転軸部材に作用するトルクを算出するトルク
算出手段と、を備えてなることを特徴とするものであ
る。That is, a torque detecting device according to the present invention is a torque detecting device for detecting a torque acting on a rotating shaft member made of a magnetic material, wherein the rotating shaft member is close to the peripheral surface of the rotating shaft member. A set of magnetic heads arranged at predetermined intervals in the axial direction of the member,
◆ recording means for recording a position signal on the rotary shaft member via each of these magnetic heads; ◆ phase difference detection means for detecting a phase difference between the position signals reproduced via each of the magnetic heads; Torque calculating means for calculating the torque acting on the rotary shaft member based on the phase difference detected by the phase difference detecting means.
【０００９】[0009]
【発明の作用および効果】上記構成に示すように、磁性
材料からなる回転軸部材に、その軸線方向に所定間隔を
おいて配置された１組の磁気ヘッドを介して位置信号を
記録し、そして、各磁気ヘッドを介して再生された位置
信号相互間の位相差を検出し、この検出された位相差に
基づいて、回転軸部材に作用するトルクを算出するよう
になっているので、つまり、回転軸部材自体の磁気特性
を利用した記録再生によりトルク検出を行うようになっ
ているので、従来のように、トルク検出のために、回転
軸部材に機械加工や表面処理を施したり、スリップリン
グ等の余分な機構部品を付加したりする必要がない。ま
た、回転軸部材に生じるねじれ残留歪により両磁気ヘッ
ド間で初期位相にずれが生じても、記録の更新が可能で
あるため、このずれを容易に修正することができる。As described above, the position signal is recorded on the rotary shaft member made of a magnetic material through a set of magnetic heads arranged at a predetermined interval in the axial direction of the rotary shaft member, and , The phase difference between the position signals reproduced via each magnetic head is detected, and the torque acting on the rotary shaft member is calculated based on the detected phase difference, that is, Since the torque is detected by recording / reproducing using the magnetic characteristics of the rotating shaft member itself, in order to detect the torque, the rotating shaft member is machined or surface-treated, or a slip ring is used in order to detect the torque. There is no need to add extra mechanical parts such as. Further, even if the initial phase shift occurs between the two magnetic heads due to the residual torsional strain generated in the rotary shaft member, since the recording can be updated, this shift can be easily corrected.
【００１０】したがって、本発明によれば、トルク検出
装置を小型で簡単な構成とすることができ、かつ、取付
作業や経年変化によりトルク検出誤差が生じるのを防止
することができる。Therefore, according to the present invention, it is possible to make the torque detection device small and simple, and to prevent the torque detection error from occurring due to the mounting work or aging.
【００１１】[0011]
【実施例】以下、添付図面を参照しながら、本発明の実
施例について説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１２】図１は、本発明に係るトルク検出装置の一
実施例を示す概要構成図である。FIG. 1 is a schematic block diagram showing an embodiment of a torque detecting device according to the present invention.
【００１３】このトルク検出装置は、磁性材料からなる
回転軸部材１０に作用するトルクを検出するトルク検出
装置であって、回転軸部材１０の周面に近接して回転軸
部材１０の軸線方向に所定間隔Ｌをおいて配置された１
組の磁気ヘッド１２ａ，１２ｂと、これら各磁気ヘッド
１２ａ，１２ｂを介して回転軸部材１０に位置信号を記
録する記録回路１４（記録手段）と、各磁気ヘッド１２
ａ，１２ｂを介して再生された位置信号相互間の位相差
を検出し、この検出された位相差に基づいて回転軸部材
１０に作用するトルクを算出するトルク算出回路１６
（位相差検出手段、トルク算出手段）とを備えてなって
いる。This torque detecting device is a torque detecting device for detecting the torque acting on the rotary shaft member 10 made of a magnetic material, and is close to the peripheral surface of the rotary shaft member 10 in the axial direction of the rotary shaft member 10. 1 arranged at a predetermined interval L
A set of magnetic heads 12a and 12b, a recording circuit 14 (recording means) for recording a position signal on the rotary shaft member 10 via each of the magnetic heads 12a and 12b, and each magnetic head 12
A torque calculation circuit 16 for detecting the phase difference between the position signals reproduced via a and 12b and calculating the torque acting on the rotary shaft member 10 based on the detected phase difference.
(Phase difference detecting means, torque calculating means).
【００１４】回転軸部材１０は構造用鋼であるＳ４５Ｃ
の焼入れ材からなる動力伝達軸であって、図の左端にお
いて図示しない駆動源に、右端において負荷にそれぞれ
連結されている。１対の磁気ヘッド１２ａ，１２ｂは、
いずれも記録再生用の誘導型の磁気ヘッドであって、図
示しないハウジングに固定されている。本実施例におい
ては、回転軸部材１０と各磁気ヘッド１２ａ，１２ｂと
のクリアランスは２０μｍである。これらの磁気ヘッド
１２ａ，１２ｂは記録回路１４および増幅器１８に接続
されており、増幅器１８はさらにフィルタ回路２０およ
び波形整形回路２２を経てトルク演算回路１６に接続さ
れている。The rotating shaft member 10 is S45C which is structural steel.
A power transmission shaft made of a hardened material, which is connected to a drive source (not shown) at the left end and a load at the right end. The pair of magnetic heads 12a and 12b are
Both are recording / reproducing inductive magnetic heads and are fixed to a housing (not shown). In this embodiment, the clearance between the rotary shaft member 10 and the magnetic heads 12a and 12b is 20 μm. These magnetic heads 12a and 12b are connected to a recording circuit 14 and an amplifier 18, and the amplifier 18 is further connected to a torque calculation circuit 16 via a filter circuit 20 and a waveform shaping circuit 22.
【００１５】次に、トルクの検出方法について説明す
る。回転軸部材１０が負荷から解放され一定回転数Ｎo
で回転している際に、記録回路１４は所定の周波数ｆo
の記録用信号を両磁気ヘッド１２ａ，１２ｂに同時に送
り、それぞれの磁気ヘッド１２ａ，１２ｂを介して回転
軸部材１０上に同位相の位置信号（図２）を記録する。
この後、回転軸部材１０にトルクが加わった状態におい
て、各磁気ヘッド１２ａ，１２ｂを介して上記位置信号
を再生し、これらの再生信号Ｓa1およびＳb1（図３）が
それぞれ増幅器１８に入力される。増幅器１８に入力さ
れた信号はさらにフィルタ回路２０および波形整形回路
２２によって方形波信号Ｓa2およびＳb2（図３）に波形
整形されてトルク演算回路１６に送出される。トルク演
算回路１６においては、Ｓa2およびＳb2両信号の周波数
ｆとそれぞれの信号の位相差Δｔを検出し、式(1) に従
い回転軸部材１０に加わったトルク値Ｔを算出する。Next, a torque detecting method will be described. The rotating shaft member 10 is released from the load and has a constant rotation speed No.
The recording circuit 14 is rotated at a predetermined frequency fo
Is sent to both magnetic heads 12a and 12b at the same time, and the same phase signal (FIG. 2) is recorded on the rotary shaft member 10 via the respective magnetic heads 12a and 12b.
After that, in a state where torque is applied to the rotary shaft member 10, the above position signals are reproduced through the magnetic heads 12a and 12b, and these reproduced signals Sa1 and Sb1 (FIG. 3) are input to the amplifier 18, respectively. .. The signal input to the amplifier 18 is further waveform-shaped by the filter circuit 20 and the waveform shaping circuit 22 into square wave signals Sa2 and Sb2 (FIG. 3) and sent to the torque calculation circuit 16. The torque calculation circuit 16 detects the frequency f of both signals Sa2 and Sb2 and the phase difference Δt between the signals, and calculates the torque value T applied to the rotary shaft member 10 according to the equation (1).
【００１６】 Ｔ＝π2 Ｇｄ4 ・Δｔ・（ｆ／ｆo ）・Ｎo ／１６Ｌ (1) ◆ ここで、Ｇは回転軸部材１０の横弾性係数、ｄは回転軸
部材１０の直径である。T = π 2 Gd 4 · Δt · (f / fo) · No / 16L (1) ◆ where G is the transverse elastic coefficient of the rotary shaft member 10, and d is the diameter of the rotary shaft member 10.
【００１７】なお、本実施例においては、回転軸部材１
０に記載する位置信号としては図２に示す形状の方形波
信号を用いて記録を行っているが、これに限られるもの
ではなく、位相差Δｔを精度良く検出できる信号であれ
ばその波形形状の如何を問うものではなく、また、パル
ス信号であってもよい。In this embodiment, the rotary shaft member 1
The position signal described in 0 is recorded using a square wave signal having the shape shown in FIG. 2, but the position signal is not limited to this, and if the signal is a signal that can accurately detect the phase difference Δt, its waveform shape is However, it may be a pulse signal.
【００１８】また、記録再生に用いる２つの磁気ヘッド
１２ａ，１２ｂの設置位置は図１に示すように両ヘッド
を揃えて配置する必要はなく、一方の磁気ヘッドに対し
て他方の磁気ヘッドを回転軸部材１０の円周方向にずれ
た位置に配置することも可能である。Further, the two magnetic heads 12a and 12b used for recording / reproducing do not have to be arranged so that the two heads are aligned with each other as shown in FIG. 1, and one magnetic head rotates the other magnetic head. It is also possible to dispose the shaft member 10 at a position displaced in the circumferential direction.
【００１９】以上説明したように、本実施例のトルク検
出装置によれば、トルク検出対象物である回転軸部材１
０になんら加工を施す必要がなく、簡単な構造によりト
ルクを検出することが可能となる。また、本実施例のよ
うに、検出状況に応じて回転軸部材１０に対し随時適切
な信号の記録を行い、トルクを検出するようにすれば、
検出レンジが広範囲に亘る場合においても全検出範囲に
おいて高精度のトルク検出を行うことができる。さらに
は、経年劣化により初期位相がずれることがなく、常に
高精度のトルク検出が可能となる。As described above, according to the torque detecting device of the present embodiment, the rotary shaft member 1 which is the torque detection object.
It is possible to detect the torque with a simple structure, since it is not necessary to process 0. In addition, as in the present embodiment, if an appropriate signal is recorded on the rotary shaft member 10 at any time according to the detection situation to detect the torque,
Even when the detection range is wide, highly accurate torque detection can be performed in the entire detection range. Furthermore, the initial phase does not shift due to deterioration over time, and high-precision torque detection is always possible.
【図１】本発明に係るトルク検出装置の一実施例を示す
概要構成図FIG. 1 is a schematic configuration diagram showing an embodiment of a torque detection device according to the present invention.
【図２】上記実施例の作用を示す、位置信号記録時の波
形図FIG. 2 is a waveform diagram at the time of recording a position signal, showing the operation of the above embodiment.
【図３】上記実施例の作用を示す、位置信号再生時の波
形図FIG. 3 is a waveform diagram at the time of reproducing a position signal, showing the operation of the above embodiment.
１０ 回転軸部材 １２ａ，１２ｂ 磁気ヘッド １４ 記録回路（記録手段） １６ トルク算出回路（位相差検出手段、
トルク算出手段）10 Rotating Shaft Members 12a, 12b Magnetic Head 14 Recording Circuit (Recording Means) 16 Torque Calculation Circuit (Phase Difference Detection Means,
Torque calculation means)
Claims (1)
トルクを検出するトルク検出装置であって、 前記回転軸部材の周面に近接して該回転軸部材の軸線方
向に所定間隔をおいて配置された１組の磁気ヘッドと、 これら各磁気ヘッドを介して前記回転軸部材に位置信号
を記録する記録手段と、 前記各磁気ヘッドを介して再生された位置信号相互間の
位相差を検出する位相差検出手段と、 この位相差検出手段により検出された位相差に基づい
て、前記回転軸部材に作用するトルクを算出するトルク
算出手段と、を備えてなることを特徴とするトルク検出
装置。1. A torque detecting device for detecting a torque acting on a rotary shaft member made of a magnetic material, the torque detecting device being close to a peripheral surface of the rotary shaft member and having a predetermined interval in an axial direction of the rotary shaft member. A set of magnetic heads arranged, a recording means for recording a position signal on the rotary shaft member via each of these magnetic heads, and a phase difference between the position signals reproduced by each of the magnetic heads is detected. And a torque calculating means for calculating the torque acting on the rotary shaft member based on the phase difference detected by the phase difference detecting means. ..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3055097A JPH05322676A (en) | 1991-03-19 | 1991-03-19 | Torque detecting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3055097A JPH05322676A (en) | 1991-03-19 | 1991-03-19 | Torque detecting apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05322676A true JPH05322676A (en) | 1993-12-07 |
Family
ID=12989239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3055097A Withdrawn JPH05322676A (en) | 1991-03-19 | 1991-03-19 | Torque detecting apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05322676A (en) |
-
1991
- 1991-03-19 JP JP3055097A patent/JPH05322676A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980514 |