JPS624672A - Torque detecting mechanism for motor-driven power steering apparatus - Google Patents
Torque detecting mechanism for motor-driven power steering apparatusInfo
- Publication number
- JPS624672A JPS624672A JP60142358A JP14235885A JPS624672A JP S624672 A JPS624672 A JP S624672A JP 60142358 A JP60142358 A JP 60142358A JP 14235885 A JP14235885 A JP 14235885A JP S624672 A JPS624672 A JP S624672A
- Authority
- JP
- Japan
- Prior art keywords
- shafts
- input
- output shaft
- diameter part
- input shaft
- 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.)
- Granted
Links
Landscapes
- Power Steering Mechanism (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、電動式パワーステアリング装置に適するトル
ク検出機構に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a torque detection mechanism suitable for an electric power steering device.
（従来の技術）
電動式パワーステアリング装置は、ステアリング装置に
付設された電動機をハンドル操作に連動させて補助トル
クを生じさせ、ハンドル操作力を軽減する機能を有する
。電動機を作動させる為には少なくとも操舵トルクの方
向とその大きさを検出する必要があり、その為にトルク
検出機構を要する。(Prior Art) An electric power steering device has a function of reducing the steering force by causing an electric motor attached to the steering device to generate auxiliary torque in conjunction with steering wheel operation. In order to operate the electric motor, it is necessary to detect at least the direction and magnitude of the steering torque, and therefore a torque detection mechanism is required.
従来のトルク検出機構は、入力軸と出力軸の間に弾性部
材であるトーションバーを配設し、入出力軸間のトルク
を該トルクに比例した相対角度変位に変換する一方、入
力軸の外周に円筒部材を嵌合し、該円筒部材に軸方向に
平行な長大を穿設し、該長穴に入力軸に一体的に設けら
れる支軸を嵌合して該円筒部材を軸方向に移動自在に支
承し、出力軸と円筒部材の間に配設されたカム機構によ
り前記相対角度変位を円筒部材の軸方向変位に変換し、
この円筒部材の軸方向変位を検出することでトルクを検
出するようにしたもので、前記補助トルクは該検出値に
基づいて発生せしめられる。Conventional torque detection mechanisms place a torsion bar, which is an elastic member, between the input and output shafts, and convert the torque between the input and output shafts into a relative angular displacement proportional to the torque. A cylindrical member is fitted into the cylindrical member, an elongated hole parallel to the axial direction is bored in the cylindrical member, and a support shaft provided integrally with the input shaft is fitted into the elongated hole to move the cylindrical member in the axial direction. The relative angular displacement is converted into an axial displacement of the cylindrical member by a cam mechanism which is freely supported and disposed between the output shaft and the cylindrical member;
Torque is detected by detecting the axial displacement of this cylindrical member, and the auxiliary torque is generated based on the detected value.
（発明が解決しようとする問題点）
しかしながら、かかる従来のトルク検出機構を備えた電
動式パワーステアリング装置においては、前述の如くト
ルクの検出を円筒部材の軸方向変位、即ち入出力軸間の
相対角度変位を検出することで行っている為、入出力軸
間に急激に大きな回転速度差が生じた場合、電動機の作
動、即ち補助トルクの発生がハンドル操作に追従できず
、この結果、ハンドル操作に対する操舵特性（応答性）
が所望値に対してオーバーシュートしてその後所望値を
中心として減衰振動を行い、かかる状態に際しては、安
定した操舵特性が得られず操舵フィーリングが低下する
。(Problems to be Solved by the Invention) However, in an electric power steering device equipped with such a conventional torque detection mechanism, torque detection is performed based on the axial displacement of the cylindrical member, that is, the relative relationship between the input and output shafts, as described above. Since this is done by detecting angular displacement, if a sudden large rotational speed difference occurs between the input and output shafts, the operation of the electric motor, that is, the generation of auxiliary torque, cannot follow the steering wheel operation, and as a result, the steering wheel operation Steering characteristics (responsiveness)
overshoots the desired value and then performs damped oscillation around the desired value. In such a state, stable steering characteristics cannot be obtained and the steering feeling deteriorates.
そこで本発明は斯かる従来の不具合を解消すべく成され
たもので、その目的とする処は、入出力軸間に急激に大
きな回転速度差が生ずるのを抑制することができ、もっ
て安定した操舵特性が得られ、操舵フィーリングをより
向上せしめることができる電動式パワーステアリングの
トルク検出機構を提供するにある。Therefore, the present invention was made to eliminate such conventional problems, and its purpose is to suppress the sudden large difference in rotational speed between the input and output shafts, thereby achieving stable operation. It is an object of the present invention to provide a torque detection mechanism for electric power steering that can obtain steering characteristics and further improve the steering feeling.
（問題点を解決するための手段及び作用）上記問題点を
解決するため本発明は、入力軸（１）と出力軸（２）を
弾性部材（８）を介して連結し、該両軸（１）、（２）
間に加わるトルクを該両軸間の相対回転変位に変換して
検出する電動式パワーステアリング装置のトルク検出機
構において、前記入力軸（１）と出力軸（２）の間には
該両軸（１）。(Means and operations for solving the problems) In order to solve the above problems, the present invention connects the input shaft (1) and the output shaft (2) via an elastic member (8), and the two shafts ( 1), (2)
In a torque detection mechanism of an electric power steering device that detects torque applied between the two shafts by converting it into a relative rotational displacement between the two shafts, the two shafts (1) and (2) are connected between the input shaft (1) and the output shaft (2). 1).
（２）の相対回転速度に対応して抵抗力を発生する粘性
流体（７ａ）を設けることで前記弾性部材（８）と並列
にダンパ機構（７）を構成してなり、両軸（１）。A damper mechanism (7) is configured in parallel with the elastic member (8) by providing a viscous fluid (7a) that generates a resistance force in response to the relative rotation speed of (2), and both shafts (1) .
（２）間に急激に大きな回転速度差が生ずるのをダンパ
機構（７）の抵抗力により抑制することができ、操舵特
性の行き過ぎ及び振動を軽減することができる。(2) It is possible to suppress the sudden large difference in rotational speed from occurring between the two positions by the resistance force of the damper mechanism (7), and it is possible to reduce excessive steering characteristics and vibrations.
（実施例）
以下に本発明の好適一実施例を添付図面に基づいて説明
する。(Embodiment) A preferred embodiment of the present invention will be described below based on the accompanying drawings.
第１図は本発明に係るトルク検出機構を示す機械的構成
部分の縦断面図であり、この図では中心部で切断線を９
０°折曲させて断面を形成する。FIG. 1 is a longitudinal cross-sectional view of a mechanical component showing a torque detection mechanism according to the present invention, and in this figure, a cutting line is taken at 90 degrees at the center.
Bend at 0° to form a cross section.
第２図は入力軸と出力軸の連結部を示す図、第３図は同
じく連結部を示す図で、工は第２図縦断面図、ＩＩは工
の左側面図１ｍはＩの右側面図である。Figure 2 is a diagram showing the connecting part between the input shaft and output shaft, and Figure 3 is a diagram showing the connecting part. Figure 2 is a longitudinal sectional view of Figure 2, II is the left side of Figure 1m is the right side of I It is a diagram.
（１）は入力軸、（２）は出力軸で、これらの軸は、ケ
ース（１３）に設けた軸受（２０） 、（２１）により
回動自在に支承されている。入力軸（１）はその左端に
小径部（１ａ）が同心的に設けられ、出力軸（２）の右
端の大径部（２ａ）に穿設された同心の孔に嵌合される
と共に軸受（３）、（４）を介して回動自在に取り付け
られている。軸受（３） 、（４）の外方にはシール・
リング（５）、（８）が設けられ、シール・リング（５
）、大径部（２ａ）の孔、シール・リング（８）、小径
部（ｌａ）の外周により形成される空間（Ｓ）には、オ
イル、グリース等の粘性流体（７ａ）が封入され、入力
軸（１）と出力軸（２）の相対回転速度に略比例する抵
抗力が発生するダンパー機構（７）を形成すると共に、
軸受（３）、（４）を潤滑する。入力軸（１）と出力軸
（２）との間には同心的に弾性部材なるトーションバー
（８）が設けられ、その一端をピン（２３）で入力軸（
１）に固定すると共に他端をピン（９）により出力軸に
固定し、入力軸（１）と出力軸（２）間のトルクに比例
した相対回転変位を発生させる。入力軸（１）には断面
略扇状の溝（ｌｂ）が対称の位置に２ケ所穿設され、出
力軸の左端の対称な位置に２ケ所突設した断面略扇状の
（２ｂ） 、 （２ｂ）が適当な間隙を有して嵌合され
る。従って、入力軸（１）と出力軸（２）は所定の位置
から双方に一定の角度のみ回転可能であり、それ以上の
角度は前記溝（ｌｂ）と前記爪（２ｂ）が係合すること
により相対回転不能となる安全機構が構成される。(1) is an input shaft, (2) is an output shaft, and these shafts are rotatably supported by bearings (20) and (21) provided in the case (13). The input shaft (1) has a small diameter part (1a) concentrically provided at its left end, which is fitted into a concentric hole drilled in a large diameter part (2a) at the right end of the output shaft (2), and is fitted with a bearing. It is rotatably attached via (3) and (4). There are seals on the outside of the bearings (3) and (4).
Rings (5), (8) are provided and a sealing ring (5) is provided.
), a space (S) formed by the hole of the large diameter part (2a), the seal ring (8), and the outer periphery of the small diameter part (la) is filled with a viscous fluid (7a) such as oil or grease, Forming a damper mechanism (7) that generates a resistance force approximately proportional to the relative rotational speed of the input shaft (1) and the output shaft (2),
Lubricate bearings (3) and (4). A torsion bar (8), which is an elastic member, is provided concentrically between the input shaft (1) and the output shaft (2), and one end of the torsion bar (8) is connected to the input shaft (2) with a pin (23).
1) and the other end is fixed to the output shaft with a pin (9) to generate a relative rotational displacement proportional to the torque between the input shaft (1) and the output shaft (2). The input shaft (1) has two grooves (lb) with a substantially fan-shaped cross section bored at symmetrical positions, and grooves (2b) with a substantially fan-shaped cross section protruding from two symmetrical positions on the left end of the output shaft. ) are fitted with an appropriate gap. Therefore, the input shaft (1) and the output shaft (2) can only rotate by a certain angle from a predetermined position, and beyond that angle the groove (lb) and the pawl (2b) engage. This constitutes a safety mechanism that prevents relative rotation.
入力軸（１）の外周には、中空鉄合金の可動部（ｌＯ）
が遊嵌され該可動部（ｌＯ）の両端部には断面略扇状の
突出部（１０ａ）、（１０ａ）が一体重に設けられる。On the outer periphery of the input shaft (1), there is a moving part (lO) made of hollow iron alloy.
is loosely fitted, and protrusions (10a), (10a) each having a generally fan-shaped cross section are integrally provided at both ends of the movable portion (lO).
該突出部（１０ａ）、（１０ａ）は、第３図に示す如く
板ばね（１１）、（１１）の一端と連続する中空円板（
ｌｌａ）、（ｌｌａ）に嵌合されると共に第１図に示す
如く中空銅合金の円筒部材（１２）、（１３）に圧入固
定される。斯くして板ばね（１１）、（１１）はその一
端が可動部（１０）に一体重に取り付けられる。可動部
（１ｏ）の左端に設けられる第３図ＩＩで示す板ばね（
１１）の他端はリベット（１４）、（１４）により入力
軸（１）に−体重に固定され、一方可動部（ｌＯ）の右
端に設けられる第３図■で示す板ばね（１１）の他端は
、可動部（１０）を円筒部材（１２）を介して圧縮付勢
するコイルスプリング（１５）を外周に捲装した中空の
固定部材（１Ｂ）により入力軸（１）と共に固定される
。従って可動部（１０）は板ばね（！■）により軸方向
のみ移動自在でかつコイルスプリング（１５）により左
方に付勢される。可動部（ｌＯ）の左端に固定される円
筒部材（１３）の端部には少なくとも１ケ所にカム面（
１３ａ）を有し、該カム面（１３ａ）には出力軸（２）
の側面にビン（２ｂ）を介して回動自在に支承されるロ
ーラなる軸受（１７）が係合される。このカム面（１３
ａ）とローラー（１７）によりカム機構（１８）が構成
される。The protrusions (10a), (10a) are hollow discs (10a) that are continuous with one end of the leaf springs (11), (11), as shown in FIG.
lla) and (lla), and is press-fitted and fixed into hollow copper alloy cylindrical members (12) and (13) as shown in FIG. In this way, the leaf springs (11), (11) are attached at one end to the movable part (10) with one weight. A leaf spring (shown in FIG. 3 II) provided at the left end of the movable part (1o)
11) The other end is fixed to the input shaft (1) by rivets (14), (14), and the leaf spring (11) shown in Figure 3 (■) provided at the right end of the movable part (lO). The other end is fixed together with the input shaft (1) by a hollow fixed member (1B) whose outer periphery is wrapped with a coil spring (15) that compresses and urges the movable part (10) via a cylindrical member (12). . Therefore, the movable part (10) is movable only in the axial direction by the leaf spring (!■), and is biased to the left by the coil spring (15). A cam surface (
13a), and the cam surface (13a) has an output shaft (2).
A bearing (17), which is a roller, is rotatably supported on the side surface of the roller via a pin (2b). This cam surface (13
a) and the roller (17) constitute a cam mechanism (18).
従って、入力軸（１）と出力軸（２）の相対回転変位は
、力ｔ、４λ構（１８）とコイルスプリング（１５）と
板ばね（ｌりにより可動部（１０）の軸方向変位に変換
される。Therefore, the relative rotational displacement between the input shaft (1) and the output shaft (2) is caused by the force t, the axial displacement of the movable part (10) due to the 4λ structure (18), the coil spring (15), and the leaf spring (1). converted.
ところで入力軸（１）と出力軸（２）はケース（１８）
に設けられた軸受（２０） 、（２１）により回動自在
に支承されており、可動部（１０）の外周には適当な間
隙を有してケース（１９）の内周面に一体的に固定され
る差動変圧器（２２）が設けられ、この差動変圧器（２
２）により前記可動部の軸方向変位が電気信号に変換さ
れる。差動変圧器（２２）はその中央部に設けられた一
次コイル（２２ａ）の両端に二次コイル（２２ｂ） 、
（２２ｃ）を備えてなり、−次コイル（２２ａ）には
交流電圧が印加される。このとき可動部（１０）の位置
により二次コイル（２２ｂ） 、 （２２ｃ）の誘導電
圧が差動的に変化し可動部（１０）の軸方向変位が電気
信号に変換されて検出される。By the way, the input shaft (1) and output shaft (2) are case (18)
It is rotatably supported by bearings (20) and (21) provided in the movable part (10), and is integrally attached to the inner peripheral surface of the case (19) with an appropriate gap around the outer periphery of the movable part (10). A fixed differential transformer (22) is provided, and the differential transformer (22)
2) converts the axial displacement of the movable part into an electrical signal. The differential transformer (22) has a primary coil (22a) provided in the center thereof, and a secondary coil (22b) at both ends.
(22c), and an alternating current voltage is applied to the negative coil (22a). At this time, the induced voltages of the secondary coils (22b) and (22c) change differentially depending on the position of the movable part (10), and the axial displacement of the movable part (10) is converted into an electric signal and detected.
以上の構成により、シールリング（５）、（８）大径部
（２ａ）の孔及び小−径部の外周により形成された空間
に封入されたオイルグリースなる粘性流体は、入出力軸
に対し、この入出力軸間の相対回転速度に略比例した抵
抗体として作用するダンパ機構を構成し、斯かるダンパ
機構の作用により入出力軸間に急激で大きな回転速度差
が生ずるのを抑制するふとができ、操舵特性の行き過ぎ
及び振動を軽減することができる。With the above configuration, the viscous fluid, which is oil grease, sealed in the space formed by the holes of the large diameter part (2a) of the seal rings (5) and (8) and the outer periphery of the small diameter part can be applied to the input/output shaft. , constitutes a damper mechanism that acts as a resistor approximately proportional to the relative rotational speed between the input and output shafts, and suppresses sudden and large rotational speed differences between the input and output shafts due to the action of the damper mechanism. This makes it possible to reduce excessive steering characteristics and vibrations.
尚、本実施例におけるトルク検出機構においては、可動
部（１０）は他の部材に対して摺動することはなく軸方
向に変位するため、この変位量を検出することで摩擦の
影響を受けない信頼度の高いトルク検出を行うことがで
きる。そしてカム機構（１８）は、ローラの作用により
上記効果を助長する。In the torque detection mechanism of this embodiment, the movable part (10) does not slide relative to other members but is displaced in the axial direction, so by detecting the amount of displacement, it is possible to detect the influence of friction. It is possible to perform highly reliable torque detection. The cam mechanism (18) promotes the above effect through the action of the roller.
（発明の効果）
以上の説明により明らかな如く本発明によれば、入出力
秒間に急激に大きな回転速度差が生じるのを抑制するこ
とができ、もって安定した操舵特性が得られ、操舵フィ
ーリングをより向上せしめることができる電動式パワー
ステアリング装置のトルク検出機構を提供することがで
きる。(Effects of the Invention) As is clear from the above explanation, according to the present invention, it is possible to suppress sudden large rotational speed differences between input and output seconds, thereby achieving stable steering characteristics and improving steering feel. It is possible to provide a torque detection mechanism for an electric power steering device that can further improve the performance.
第１図は本発明に係るトルク検出機構の機械的構成部分
の縦断面図であり、この図では中心部で切断線を９０”
折曲させて断面を形成する。第２図は入力軸と出力軸の
連結部を示す図、第３図は同じく連結部を示す図で、工
は第２図縦断面図、ＩＩは工の左側面図、■は工の右側
面図であ条。
そして図面中、
（１）・・・・・・入力軸、
（２）・・・・・・出力軸、
（７）・・・・・・ダンパ機構、
（７ａ）・・・・・・粘性流体、
（８）・・・・・・弾性部材であるトーションバー、（
１０）・・・・・・円筒部材である可動部、（１１）・
・・・・・板ばね、
（ｔ３ａ）・・・・・・−カム面。
（１７）・・・・・・ローラ、
（１８）・・・・・・カム機構
である。FIG. 1 is a longitudinal sectional view of the mechanical components of the torque detection mechanism according to the present invention, and in this figure, the cutting line at the center is 90"
Bend it to form a cross section. Figure 2 is a diagram showing the connecting part between the input shaft and output shaft, and Figure 3 is a diagram showing the connecting part. Figure 2 is a longitudinal sectional view of Figure 2, II is a left side view of the Figure, and ■ is the right side of the Figure. Sectional drawing. In the drawings, (1)...Input shaft, (2)...Output shaft, (7)...Damper mechanism, (7a)...Viscosity Fluid, (8)...Torsion bar, which is an elastic member, (
10)...Movable part which is a cylindrical member, (11).
...Plate spring, (t3a) ....-cam surface. (17)...roller, (18)...cam mechanism.
Claims (1)
加わるトルクを該両軸間の相対回転変位に変換して検出
する電動式パワーステアリング装置のトルク検出機構に
おいて、前記入力軸と出力軸の間には前記弾性部材と並
列に該両軸の相対回転速度に対応して抵抗力を発生する
ダンパ機構を設けたことを特徴とする電動式パワーステ
アリング装置のトルク検出機構。In a torque detection mechanism of an electric power steering device that connects an input shaft and an output shaft via an elastic member and detects torque applied between the two shafts by converting it into a relative rotational displacement between the two shafts, the input shaft A torque detection mechanism for an electric power steering device, characterized in that a damper mechanism is provided between the output shaft and the output shaft in parallel with the elastic member and generates a resistance force in response to the relative rotational speed of the two shafts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60142358A JPS624672A (en) | 1985-06-28 | 1985-06-28 | Torque detecting mechanism for motor-driven power steering apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60142358A JPS624672A (en) | 1985-06-28 | 1985-06-28 | Torque detecting mechanism for motor-driven power steering apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS624672A true JPS624672A (en) | 1987-01-10 |
| JPH0450228B2 JPH0450228B2 (en) | 1992-08-13 |
Family
ID=15313520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60142358A Granted JPS624672A (en) | 1985-06-28 | 1985-06-28 | Torque detecting mechanism for motor-driven power steering apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS624672A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4799566A (en) * | 1987-01-22 | 1989-01-24 | Honda Giken Kogyo Kabushiki Kaisha | Motor-operated power steering apparatus |
| US4881414A (en) * | 1987-05-12 | 1989-11-21 | Nippondenso Co., Ltd. | Torque detection apparatus |
| EP0857639A3 (en) * | 1997-02-10 | 2000-03-15 | Trw Inc. | Steering gear |
| KR101443866B1 (en) * | 2013-08-27 | 2014-09-23 | 중경기술주식회사 | Fire hydrant box |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006213249A (en) | 2005-02-04 | 2006-08-17 | Yamaha Motor Co Ltd | Motorcycle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5968235U (en) * | 1982-10-29 | 1984-05-09 | トヨタ自動車株式会社 | Steering torque detection mechanism in power steering device |
-
1985
- 1985-06-28 JP JP60142358A patent/JPS624672A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5968235U (en) * | 1982-10-29 | 1984-05-09 | トヨタ自動車株式会社 | Steering torque detection mechanism in power steering device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4799566A (en) * | 1987-01-22 | 1989-01-24 | Honda Giken Kogyo Kabushiki Kaisha | Motor-operated power steering apparatus |
| US4881414A (en) * | 1987-05-12 | 1989-11-21 | Nippondenso Co., Ltd. | Torque detection apparatus |
| EP0857639A3 (en) * | 1997-02-10 | 2000-03-15 | Trw Inc. | Steering gear |
| KR101443866B1 (en) * | 2013-08-27 | 2014-09-23 | 중경기술주식회사 | Fire hydrant box |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0450228B2 (en) | 1992-08-13 |
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