JP3359693B2 - Clutch device for electric power steering device - Google Patents
Clutch device for electric power steering deviceInfo
- Publication number
- JP3359693B2 JP3359693B2 JP10424893A JP10424893A JP3359693B2 JP 3359693 B2 JP3359693 B2 JP 3359693B2 JP 10424893 A JP10424893 A JP 10424893A JP 10424893 A JP10424893 A JP 10424893A JP 3359693 B2 JP3359693 B2 JP 3359693B2
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- output shaft
- sprag
- input shaft
- sprags
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D41/00—Freewheels or freewheel clutches
- F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
- F16D41/08—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface with provision for altering the freewheeling action
- F16D41/10—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface with provision for altering the freewheeling action with self-actuated reversing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
- One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、クラッチ装置に関
し、例えば電動パワーステアリング装置の駆動力切換え
に使用される。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch device, and is used, for example, for switching the driving force of an electric power steering device.
【０００２】[0002]
【従来の技術】自動車の電動パワーステアリング装置
は、図９に示すようにハンドル３１を回転操作すると、
車輪３３からの抵抗によりハンドル軸３２に発生するト
ルクをセンサー３４が検出し、制御装置３５を通じて駆
動されるモータ３６が、減速機３７を介してハンドル軸
３２のピニオン３８を回転させ、これにかみ合ったラッ
ク３９を介して車輪３３を操舵するようになっている。2. Description of the Related Art An electric power steering apparatus for a motor vehicle, when a steering wheel 31 is rotated as shown in FIG.
The sensor 34 detects the torque generated on the handle shaft 32 by the resistance from the wheels 33, and the motor 36 driven through the control device 35 rotates the pinion 38 of the handle shaft 32 via the speed reducer 37, and meshes with this. The wheels 33 are steered via the rack 39 which is provided.
【０００３】上記の電動パワーステアリング装置におい
ては、制御装置３５やモータ３６、減速機３７等の駆動
系に異常が発生した場合、手動によるハンドル３１の操
作に切換ることができるように、減速機３７とピニオン
３８の間にクラッチ装置１を設け、ハンドル軸３２に対
する駆動経路を切換える構造がとられている。In the above-described electric power steering apparatus, when an abnormality occurs in a drive system such as the control device 35, the motor 36, and the speed reducer 37, the operation of the speed reducer 31 can be manually switched to the operation of the handle 31. The clutch device 1 is provided between the pinion 37 and the pinion 38 to switch the drive path for the handle shaft 32.
【０００４】このような駆動経路を機械的に切換えるク
ラッチ装置１として、従来図１０乃至図１１に示すよう
な構造のものが考えられている（特願昭６３−２３５７
３１号）。Conventionally, as a clutch device 1 for mechanically switching the drive path, a clutch device having a structure as shown in FIGS. 10 and 11 has been proposed (Japanese Patent Application No. 63-2357).
No. 31).
【０００５】この構造は、同軸上に配置した入力軸２と
出力軸３の外側に外輪４を嵌合させ、その出力軸３と外
輪４の対向面に形成した円筒面５、６の間に、入力軸２
と一体の保持器８と、出力軸３に固定される保持器７を
設け、この両保持器７、８に設けたポケット９、１０
に、外輪４と出力軸３の相対回転によって両円筒面５、
６に係合するスプラグ１１と、そのスプラグ１１を中立
状態に保持する弾性材１２を組込んでいる。In this structure, an outer ring 4 is fitted to the outside of an input shaft 2 and an output shaft 3 which are coaxially arranged, and a cylindrical surface 5, 6 formed on the facing surface of the output shaft 3 and the outer ring 4. , Input shaft 2
And a retainer 7 fixed to the output shaft 3. Pockets 9, 10 provided in both retainers 7, 8 are provided.
In addition, by the relative rotation of the outer ring 4 and the output shaft 3, both cylindrical surfaces 5,
A sprag 11 that engages with the elastic member 6 and an elastic material 12 that holds the sprag 11 in a neutral state are incorporated.
【０００６】また、入力軸２に形成した角孔１６に、出
力軸３に設けた角軸１７を回転方向すき間Ｘを介して嵌
合させ、入力軸２と出力軸３の間に、その両者を回転方
向すき間Ｘの中立位置に保持すると共に、入力軸２に一
定以上の回転力が付与された時に回転方向すき間Ｘが無
くなるまで弾性変形するトルク設定弾性部材１３を組込
んでいる。A square shaft 17 provided on the output shaft 3 is fitted into a square hole 16 formed on the input shaft 2 via a gap X in the rotation direction. And a torque setting elastic member 13 that elastically deforms until the rotational direction gap X disappears when a rotational force equal to or more than a predetermined value is applied to the input shaft 2.
【０００７】上記構造のクラッチ装置では、入力軸２に
加わる回転力が、トルク設定弾性部材１３の設定トルク
以下の時はクラッチが作動せず、入力軸２から出力軸３
に回転力が伝達されるが、入力軸２に加わる回転力が設
定トルク以上になると、スプラグ１１と両円筒面５、６
が係合してクラッチが成立し、外輪４からの回転力が出
力軸３に伝達される。In the clutch device having the above structure, when the rotational force applied to the input shaft 2 is equal to or less than the set torque of the torque setting elastic member 13, the clutch does not operate, and the input shaft 2
When the rotational force applied to the input shaft 2 exceeds a set torque, the sprag 11 and the two cylindrical surfaces 5 and 6 are transmitted.
Are engaged to establish a clutch, and the rotational force from the outer race 4 is transmitted to the output shaft 3.
【０００８】[0008]
【発明が解決しようとする課題】ところで、上記構造の
クラッチ装置において、スプラグ１１が中立状態から図
１３に示すように円周方向に傾動し、スプラグ両端部の
カム面１４、１５がそれぞれ外輪４の円筒面６と出力軸
３の円筒面５に接触すると、クラッチ噛み合い可能状態
となる。By the way, in the clutch device having the above structure, the sprags 11 tilt in the circumferential direction from the neutral state as shown in FIG. Is brought into contact with the cylindrical surface 6 of the output shaft 3 and the cylindrical surface 6 of the output shaft 3.
【０００９】そして、この状態から、外輪４が出力軸３
に対して図１３の矢印イ方向に相対回転すると、スプラ
グ１１が両円筒面５、６に係合してトルク負荷状態とな
り、逆に外輪４が矢印ロ方向に相対回転すると、外輪４
がスプラグ１１に対してオーバーランニングし、空転状
態となる。Then, from this state, the outer ring 4 is connected to the output shaft 3.
13, the sprags 11 are engaged with the two cylindrical surfaces 5 and 6 to be in a torque load state. Conversely, when the outer ring 4 is relatively rotated in the direction of arrow B, the outer ring 4 is rotated.
Overruns with respect to the sprag 11, and becomes idle.
【００１０】上記のクラッチ装置では、スプラグ１１が
両円筒面５、６と係合してトルクを確実に伝達するため
には、図１３のように係合した状態でスプラグ１１の両
端部の接触点ａ、ｂを結んだ線Ａが、回転中心から一方
の接触点ａを通って延びる線Ｂに対して傾き、一定のく
さび角αを形成する必要がある。In the clutch device described above, in order for the sprag 11 to engage with the two cylindrical surfaces 5 and 6 to reliably transmit the torque, the contact between the two ends of the sprag 11 in the engaged state as shown in FIG. The line A connecting the points a and b must be inclined with respect to the line B extending from the center of rotation through one contact point a to form a constant wedge angle α.
【００１１】このため、従来のスプラグ１１は、図１４
に示すように両端部のカム面１４、１５をそれぞれ曲率
の中心位置が異なる円弧面１８、１９で形成し、その各
円弧面１８、１９の曲率半径Ｒ3 、Ｒ4 とその中心位置
をそれぞれ互いに異ならせて、円筒面５、６と円弧面１
８、１９の接触時に所定のくさび角αが形成されるよう
にしている。また、各ポケット９、１０に挿入するスプ
ラグ１１の両端部の幅寸法ｔ1 、ｔ2 を、主として品質
管理の上から同一の寸法ｔ1 ＝ｔ2 で形成している。For this reason, the conventional sprag 11 has a structure shown in FIG.
The cam surfaces 14 and 15 at both ends to form a circular arc surface 18, 19 the center position of the different curvatures, respectively, as shown in, each of which radius of curvature R 3 of the arcuate surfaces 18 and 19, R 4 and their central position Different from each other, cylindrical surfaces 5, 6 and arc surface 1
A predetermined wedge angle α is formed at the time of contact between 8 and 19. The width dimensions t 1 , t 2 of both ends of the sprag 11 to be inserted into the pockets 9, 10 are formed with the same dimension t 1 = t 2 mainly for quality control.
【００１２】ところが、上記のように両端部の幅寸法を
同一にした従来のスプラグ１１では、両端のカム面１
４、１５を形成する円弧面１８、１９の曲率半径が相違
するものの、その径差は小さく、スプラグ両端はほぼ対
称形状であって、その両端部の形状の相違を簡単に見分
けることが難しいために、各保持器７、８のポケット
９、１０にスプラグ１１を挿入する際、その両端部の向
きを間違って組立てる恐れがある。However, in the conventional sprag 11 having the same width at both ends as described above, the cam surfaces 1 at both ends are provided.
The curvature radii of the arcuate surfaces 18 and 19 that form 4 and 15 are different
However, the diameter difference is small and both ends of the sprag are almost
Since it is difficult to easily distinguish the difference in the shape of both ends of the sprags 11 when inserting the sprags 11 into the pockets 9 and 10 of the retainers 7 and 8, the orientations of the two ends are incorrect. There is a risk of assembly.
【００１３】このように、スプラグ１１の向きが誤まっ
て組立てられると、設定した伝達トルクが得られないば
かりでなく、クラッチの耐久性にも悪影響を及ぼす。例
えば、組立ての誤まりにより１本のスプラグのくさび角
が他のスプラグよりも小さくなると、そのスプラグが異
常摩耗を起こし、クラッチ寿命を低下させる恐れがあ
る。If the sprags 11 are assembled in the wrong direction, not only the set transmission torque cannot be obtained but also the durability of the clutch is adversely affected. For example, if the wedge angle of one sprag becomes smaller than that of the other sprag due to an erroneous assembly, the sprag may cause abnormal wear and shorten the life of the clutch.
【００１４】そこで、この発明は、上記の問題を解決
し、スプラグの形状に工夫を加えることによりスプラグ
の組立ての誤まりを確実に防止することができるクラッ
チ装置を提供しようとするものである。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a clutch device which can surely prevent erroneous assembly of a sprag by modifying the shape of the sprag.
【００１５】[0015]
【課題を解決するための手段】上記の課題を解決するた
め、この発明は、スプラグの両端部における円周方向の
幅寸法を互いに異ならせ、これらの両端部が挿入される
各保持器のポケットの円周方向の幅寸法もスプラグの両
端部の幅寸法に応じて異ならせ、かつ上記スプラグの大
きい側の端部の幅寸法を上記ポケットの小さい側の幅寸
法よりも大きく設定したのである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, circumferential widths at both ends of a sprag are made different from each other, and these both ends are inserted.
The circumferential width of each cage pocket is also
Be different according to the width of the end, and
The width of the end on the threshold side is set to be larger than the width of the small side of the pocket .
【００１６】[0016]
【作用】上記の構造においては、スプラグの大きい側の
端部がスプラグを保持する他方の保持器のポケットに挿
入されるようにし、その挿入状態で正規の組立てとなる
ように設定すると、スプラグの両端部を逆にして組立て
るようにしても、一方の保持器のポケット幅よりスプラ
グの幅が大きいために、両者が干渉して組立ることがで
きず、誤りを防止できる。In the above structure, the sprag is inserted into the pocket of the other retainer for holding the sprag, and if the sprag is set so as to be properly assembled in the inserted state, the sprag of the sprag is set. Even when assembling with both ends reversed, the sprags are wider than the pocket width of one of the retainers, so that they cannot interfere with each other to assemble, thereby preventing errors.
【００１７】[0017]
【実施例】図１乃至図４は実施例のクラッチ装置を示
し、図５はそのクラッチ装置に使用されるスプラグの断
面形状を示している。1 to 4 show a clutch device according to an embodiment, and FIG. 5 shows a sectional shape of a sprag used in the clutch device.
【００１８】なお、このクラッチ装置の基本的構造と作
用は、従来技術の項で述べたので、同一部品には同一の
符号を付して説明を省略し、ここでは実施例の特徴部分
について説明する。Since the basic structure and operation of this clutch device have been described in the section of the prior art, the same parts will be denoted by the same reference numerals and description thereof will be omitted, and only the features of the embodiment will be described. I do.
【００１９】図１乃至図３に示すように、この実施例で
は、入力軸２の端部に角軸１７を、出力軸３にその角軸
１７が嵌合する角孔１６を設け、この角軸１７と角孔１
６との間に、コイルバネ等からなるトルク設定弾性部材
１３を組込んでいる。As shown in FIGS. 1 to 3, in this embodiment, a square shaft 17 is provided at the end of the input shaft 2 and a square hole 16 into which the square shaft 17 is fitted is provided at the output shaft 3. Shaft 17 and square hole 1
6, a torque setting elastic member 13 composed of a coil spring or the like is incorporated.
【００２０】また、入力軸２と外側保持器８をピン２４
により一体に固定し、内側保持器７を出力軸３の外周面
に圧入して固定している。The input shaft 2 and the outer retainer 8 are
And the inner retainer 7 is press-fitted and fixed to the outer peripheral surface of the output shaft 3.
【００２１】図４及び図５に示すように、内外側保持器
７、８のポケット９、１０に挿入されるスプラグ１１
は、外側端部の幅寸法ｔ1 が、内側端部の幅寸法ｔ2 よ
りも大きく（ｔ1 ＞ｔ2 ）形成されている。As shown in FIGS. 4 and 5, sprags 11 inserted into pockets 9 and 10 of inner and outer retainers 7 and 8 are provided.
Is formed such that the width dimension t 1 of the outer end is larger than the width dimension t 2 of the inner end (t 1 > t 2 ).
【００２２】また、外側保持器８のポケット１０の幅寸
法ｔ3 は、スプラグ１１の外側端部の幅寸法ｔ1 よりも
大きく（ｔ3 ＞ｔ1 ）形成され、内側保持器７のポケッ
ト９の幅寸法ｔ4 は、スプラグ１１の内側端部の幅寸法
ｔ2 よりも大きく（ｔ4 ＞ｔ2 ）形成されている。The width t 3 of the pocket 10 of the outer retainer 8 is formed larger than the width t 1 of the outer end of the sprag 11 (t 3 > t 1 ), and the pocket 9 of the inner retainer 7 is formed. width t 4 of greater than the width t 2 of the inner end portion of the sprag 11 (t 4> t 2) are formed.
【００２３】さらに、スプラグ７の大きい側である外側
端部の幅寸法ｔ1 は、内側保持器７のポケット９の幅寸
法ｔ4 よりも大きく（ｔ1 ＞ｔ4 ）形成されている。す
なわち、上記の各幅寸法は、ｔ3 ＞ｔ1 ＞ｔ4 ＞ｔ2 の
関係をもつように設定されている。Further, the width t 1 of the outer end, which is the larger side of the sprag 7, is formed larger than the width t 4 of the pocket 9 of the inner retainer 7 (t 1 > t 4 ). That is, the above width dimensions are set so as to have a relationship of t 3 > t 1 > t 4 > t 2 .
【００２４】上記の構造においては、図４に示すような
向きでスプラグ１１を内外側保持器７、８に組込むと、
スプラグ１１の両端部が各ポケット９、１０に挿入さ
れ、確実に組立てることができる。In the above structure, when the sprags 11 are assembled into the inner and outer holders 7 and 8 in the directions shown in FIG.
Both ends of the sprag 11 are inserted into the respective pockets 9 and 10, so that the assembling can be carried out reliably.
【００２５】一方、スプラグ１１を、その両端部が図４
とは上下逆にして組込もうとすると、内側に位置するス
プラグ１１の外側端部（幅寸法ｔ1 ）と内側保持器７の
ポケット９（幅寸法ｔ4 ）とが干渉し、スプラグを挿入
することができない。このため、組込み方向の誤りが明
らかとなり、正しい組立て方向に挿入し直すことができ
る。On the other hand, the sprag 11 has its both ends shown in FIG.
If it is attempted to assemble it upside down, the outer end (width dimension t 1 ) of the sprag 11 located inside and the pocket 9 (width dimension t 4 ) of the inner retainer 7 interfere with each other, and the sprag is inserted. Can not do it. For this reason, an error in the assembling direction becomes apparent, and it is possible to reinsert in the correct assembling direction.
【００２６】なお、図４に示す例において、スプラグ１
１の内側端部の幅寸法を、外側端部よりも大きく、外側
保持器８のポケット幅より大きく設定しても、上記と同
じ作用を得ることができる。例えば、上記の構造におい
て、ｔ2 ＞ｔ1 、ｔ2 ＞ｔ3とし、ｔ4 ＞ｔ2 ＞ｔ3 ＞
ｔ1 となるように各幅寸法を設定しても、スプラグを同
一方向にしか組込むことしかできず、組立ての誤りを防
止することができる。In the example shown in FIG.
Even if the width dimension of the inner end of the first holder is set larger than the outer end and larger than the pocket width of the outer retainer 8, the same effect as described above can be obtained. For example, in the above structure, t 2 > t 1 , t 2 > t 3, and t 4 > t 2 > t 3 >
Setting the respective widths so that t 1, can only be incorporated only in the same direction the sprag can be prevented errors of assembly.
【００２７】また、上記の構造では、スプラグ１１の外
径側のカム面１５の両側を、くさび角が急激に増大する
円弧面（曲率半径Ｒ1 ）２０、２０で形成し、その各円
弧面２０、２０の間を、くさび角が漸増する円弧面２１
（曲率半径Ｒ2 ）で形成している。これにより、クラッ
チ噛み合い状態からトルクが負荷されると、円弧面２１
が外輪４の円筒面６と係合し、さらに過大トルクが負荷
されると、スプラグは傾動していき、円弧面２０が円筒
面６と接触しようとした場合、この円弧面２０がくさび
角が急激に増大する面であるため、円筒面６にかみ込ま
ずに接触部において滑りが生じることになり、かみ込み
による圧痕の発生やスプラグの割損事故などを防止する
ことができる。Further, in the above structure, both sides of the cam surface 15 on the outer diameter side of the sprag 11 are formed by circular arc surfaces (curvature radii R 1 ) 20, whose wedge angles increase sharply, and each of the circular arc surfaces is formed. Between 20 and 20, an arc surface 21 with a gradually increasing wedge angle
(Curvature radius R 2 ). Thus, when torque is applied from the clutch engagement state, the circular arc surface 21
Engages with the cylindrical surface 6 of the outer ring 4, and when an excessive torque is applied, the sprags tilt, and when the circular surface 20 tries to contact the cylindrical surface 6, the circular surface 20 has an increased wedge angle. Since the surface rapidly increases, slippage occurs at the contact portion without biting into the cylindrical surface 6, and it is possible to prevent the occurrence of indentation due to biting and a sprag breakage accident.
【００２８】図６は、上記実施例のクラッチ装置１を電
動パワーステアリング装置に適用した時の取付け例を示
しており、クラッチ装置１の入力軸２に、ハンドル３１
を備えるハンドル軸３２を接続し、出力軸３にラック３
９と噛み合うピニオン３８の軸４０を接続する。また、
ハンドル軸３２のねじれを検出するセンサ３４を設け、
このセンサ３４により制御装置３５を通じてモータ３６
を駆動させ、このモータ３６の回転をギヤ等の減速機構
３７を介してクラッチ装置１の外輪４に伝えるようにす
る。FIG. 6 shows an example of attachment when the clutch device 1 of the above embodiment is applied to an electric power steering device, and a handle 31 is attached to the input shaft 2 of the clutch device 1.
Is connected to the handle shaft 32 having the
The shaft 40 of the pinion 38 meshing with 9 is connected. Also,
A sensor 34 for detecting the twist of the handle shaft 32 is provided,
The motor 36 is controlled by the sensor 34 through the controller 35.
And the rotation of the motor 36 is transmitted to the outer ring 4 of the clutch device 1 via a reduction mechanism 37 such as a gear.
【００２９】一方、図７及び図８はクラッチ装置の第２
の実施例を示している。この例では、入力軸２と出力軸
３にそれらを連通する軸方向の孔２２を設け、その孔２
２に、トーションバーから成るトルク設定弾性部材１３
を挿入し、このトルク設定弾性部材１３をピン２３を介
して入力軸２と出力軸３に固定している。FIGS. 7 and 8 show the second embodiment of the clutch device.
Is shown. In this example, the input shaft 2 and the output shaft 3 are provided with an axial hole 22 communicating them with each other.
2, a torque setting elastic member 13 composed of a torsion bar
And the torque setting elastic member 13 is fixed to the input shaft 2 and the output shaft 3 via the pin 23.
【００３０】また、出力軸３に角孔１６を、入力軸３に
その角孔１６に嵌合する角軸１７を設け、この角孔１６
と角軸１７の間に回転方向すき間Ｘを設けている。The output shaft 3 is provided with a square hole 16, and the input shaft 3 is provided with a square shaft 17 fitted into the square hole 16.
A gap X in the rotation direction is provided between the shaft shaft 17 and the shaft 17.
【００３１】上記トルク設定弾性部材１３のばね力は、
入力軸２に一定以上の回転力が作用したとき、回転方向
すき間Ｘが無くなるまでトルク設定弾性部材１３が変形
し、入力軸２と出力軸３が係合するように設定されてい
る。The spring force of the torque setting elastic member 13 is:
When a predetermined rotational force or more acts on the input shaft 2, the torque setting elastic member 13 is deformed until the clearance X in the rotation direction disappears, and the input shaft 2 and the output shaft 3 are set to be engaged.
【００３２】なお、上記トルク設定弾性部材１３は、図
３及び図７に示すコイルバネやトーションバーに代え
て、板ばねや他の弾性部材を使用することができる。As the torque setting elastic member 13, a leaf spring or another elastic member can be used instead of the coil spring and the torsion bar shown in FIGS.
【００３３】[0033]
【効果】以上のように、この発明は、スプラグと保持器
のポケットの幅を干渉させ、スプラグを一定の向きでし
か組込めないようにしたので、スプラグの組立ての誤り
がなくなり、安定した品質と設計通りの伝達トルクを満
足する機能をクラッチ装置に与えることができる効果が
ある。As described above, according to the present invention, the width of the sprags and the pocket of the retainer interfere with each other, so that the sprags can be installed only in a fixed direction. Thus, there is an effect that a function that satisfies the transmission torque as designed can be given to the clutch device.
【図１】実施例のクラッチ装置を示す縦断正面図FIG. 1 is a longitudinal sectional front view showing a clutch device of an embodiment.
【図２】同上の縦断側面図FIG. 2 is a longitudinal side view of the above.
【図３】図１のIII −III 線の断面図FIG. 3 is a sectional view taken along line III-III in FIG. 1;
【図４】クラッチ装置の要部を拡大して示す断面図FIG. 4 is an enlarged sectional view showing a main part of the clutch device;
【図５】同上のスプラグの拡大図FIG. 5 is an enlarged view of the above-mentioned sprag.
【図６】実施例のクラッチ装置を電動パワーステアリン
グ装置に使用した例を示す図FIG. 6 is a diagram showing an example in which the clutch device of the embodiment is used for an electric power steering device.
【図７】第２の実施例を示す縦断正面図FIG. 7 is a longitudinal sectional front view showing a second embodiment.
【図８】同上の縦断側面図FIG. 8 is a longitudinal sectional side view of the above.
【図９】電動パワーステアリング装置の概略構造を示す
図FIG. 9 is a diagram showing a schematic structure of an electric power steering device.
【図１０】従来例を示す縦断正面図FIG. 10 is a vertical sectional front view showing a conventional example.
【図１１】図１０のXI−XI線の断面図11 is a sectional view taken along line XI-XI in FIG.
【図１２】図１０のXII − XIIの断面図12 is a sectional view taken along the line XII-XII in FIG.
【図１３】従来のクラッチ構造を拡大して示す断面図FIG. 13 is an enlarged sectional view showing a conventional clutch structure.
【図１４】従来のスプラグの拡大図FIG. 14 is an enlarged view of a conventional sprag.
１ クラッチ装置 ２ 入力軸 ３ 出力軸 ４ 外輪 ５、６ 円筒面 ７、８ 保持器 ９、１０ ポケット １１ スプラグ １２ 弾性部材 １３ トルク設定弾性部材 １４、１５ カム面 ２０、２１ 円弧面 DESCRIPTION OF SYMBOLS 1 Clutch device 2 Input shaft 3 Output shaft 4 Outer ring 5, 6 Cylindrical surface 7, 8 Cage 9, 10 Pocket 11 Sprag 12 Elastic member 13 Torque setting elastic member 14, 15 Cam surface 20, 21 Arc surface
Claims (1)
舵用のラックと噛合するピニオンの回転駆動用の出力軸
とを同軸上に配置し、その両軸の外側にモータによって
回転駆動される外輪を嵌合し、この外輪と出力軸の各対
向面にそれぞれ同軸の円筒面を形成し、その両円筒面間
に、入力軸に固定される保持器と、出力軸に固定される
保持器を設け、この両保持器に設けた径方向に対向する
ポケットに、両端にカム面を有し、その両端の形状がほ
ぼ対称形状とされたスプラグの両端部を挿入し、上記入
力軸と出力軸を回転方向すき間を介して共回り可能に連
結し、この入力軸と出力軸の間に、両軸を上記回転方向
すき間の中立位置に保持すると共に、入力軸に設定トル
ク以上の回転力が付与された時に回転方向すき間がなく
なるまで弾性変形するトルク設定弾性部材を組込んだ電
動パワーステアリング装置用のクラッチ装置において、
上記スプラグの両端部における円周方向の幅寸法を互い
に異ならせ、これらの両端部が挿入される各保持器のポ
ケットの円周方向の幅寸法もスプラグ両端部の幅寸法に
応じて異ならせ、かつ上記スプラグの大きい側の端部の
幅寸法を上記ポケットの小さい側の幅寸法より大きく設
定したことを特徴とする電動パワーステアリング装置用
のクラッチ装置。An input shaft to which a handle shaft is connected and an output shaft for rotationally driving a pinion that meshes with a wheel steering rack are arranged coaxially, and are rotatably driven by a motor outside of both shafts. An outer ring is fitted, a coaxial cylindrical surface is formed on each of the opposing surfaces of the outer ring and the output shaft, and a retainer fixed to the input shaft and a retainer fixed to the output shaft are provided between the cylindrical surfaces. The two cages are provided with cam surfaces at both ends in the pockets facing each other in the radial direction.
URN inserting both ends of the sprags which is symmetrical with the output shaft and the upper fill force shaft via a rotational direction gap linked rotate together capable, between the output shaft and the input shaft, the rotation of the two shafts A clutch device for an electric power steering device incorporating a torque setting elastic member that retains the neutral position in the directional clearance and that elastically deforms until the rotational direction clearance disappears when a rotational force greater than the set torque is applied to the input shaft. ,
The circumferential widths at both ends of the sprags are made different from each other, and the circumferential widths of the pockets of the cages into which these ends are inserted are also made different according to the widths at both ends of the sprags. A width of the large end of the sprag is set to be larger than a width of the small side of the pocket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10424893A JP3359693B2 (en) | 1993-04-30 | 1993-04-30 | Clutch device for electric power steering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10424893A JP3359693B2 (en) | 1993-04-30 | 1993-04-30 | Clutch device for electric power steering device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06313446A JPH06313446A (en) | 1994-11-08 |
| JP3359693B2 true JP3359693B2 (en) | 2002-12-24 |
Family
ID=14375641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10424893A Expired - Fee Related JP3359693B2 (en) | 1993-04-30 | 1993-04-30 | Clutch device for electric power steering device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3359693B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4619862B2 (en) * | 2005-05-24 | 2011-01-26 | 株式会社マキタ | Electric tool |
-
1993
- 1993-04-30 JP JP10424893A patent/JP3359693B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06313446A (en) | 1994-11-08 |
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