JP2002053053A - Power steering device - Google Patents
Power steering deviceInfo
- Publication number
- JP2002053053A JP2002053053A JP2000241806A JP2000241806A JP2002053053A JP 2002053053 A JP2002053053 A JP 2002053053A JP 2000241806 A JP2000241806 A JP 2000241806A JP 2000241806 A JP2000241806 A JP 2000241806A JP 2002053053 A JP2002053053 A JP 2002053053A
- Authority
- JP
- Japan
- Prior art keywords
- worm gear
- shaft
- fitting
- electric motor
- shaft portion
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はパワーステアリング
装置に関する。The present invention relates to a power steering device.
【０００２】[0002]
【従来の技術】パワーステアリング装置では、特開平7-
257406号公報に記載される舵角比調整用電動モータの回
転伝達系や、特開平11-301499号公報に記載される操舵
力アシスト用電動モータの回転伝達系で、電動モータの
側の駆動軸にウォームギヤを結合している。2. Description of the Related Art In a power steering system, Japanese Patent Application Laid-Open
No. 257406, a rotation transmission system of an electric motor for steering angle ratio adjustment, and a rotation transmission system of an electric motor for steering force assist described in Japanese Patent Application Laid-Open No. 11-301499, in which a drive shaft on the side of the electric motor is used. To the worm gear.
【０００３】[0003]
【発明が解決しようとする課題】従来技術では、電動モ
ータの側の駆動軸とウォームギヤとを同芯結合し、且つ
トルク伝達可能とするため、電動モータの側の駆動軸に
断面Ｄ字状の嵌合軸部を設けるとともに、ウォームギヤ
に断面Ｄ字状の嵌合孔部を設け、これらの嵌合軸部と嵌
合孔部とを嵌合している。In the prior art, the drive shaft on the side of the electric motor has a D-shaped cross section so that the drive shaft on the side of the electric motor and the worm gear can be concentrically connected and transmit torque. A fitting shaft is provided, and a fitting hole having a D-shaped cross section is provided in the worm gear, and the fitting shaft and the fitting hole are fitted.
【０００４】然しながら、従来技術において、ウォーム
ギヤに設ける断面Ｄ字状の嵌合孔部は切削加工が難し
く、放電加工にて対応する必要があることから、寸法精
度の高精度化に困難があり、電動モータの側の駆動軸と
ウォームギヤの同芯化に困難があるし、コストも高い。However, in the prior art, the fitting hole having a D-shaped cross section provided in the worm gear is difficult to cut and needs to be dealt with by electric discharge machining, so that it is difficult to increase the dimensional accuracy. It is difficult to make the drive shaft of the electric motor and the worm gear concentric, and the cost is high.
【０００５】本発明の課題は、パワーステアリング装置
において、電動モータの側の駆動軸とウォームギヤとを
結合するに際し、同芯結合精度を向上するとともに、コ
ンパクトにしながら高結合強度を確保し、コストも低減
することにある。SUMMARY OF THE INVENTION An object of the present invention is to improve the concentric coupling accuracy when connecting a drive shaft on the side of an electric motor and a worm gear in a power steering device, to secure high coupling strength while keeping the size compact, and to reduce the cost. Is to reduce it.
【０００６】[0006]
【課題を解決するための手段】請求項１の発明は、電動
モータをハウジングに固定し、該ハウジングに軸受を介
してウォームギヤを支持し、電動モータの側の駆動軸に
ウォームギヤを結合してなるパワーステアリング装置に
おいて、電動モータの側の駆動軸に２面巾部を備えた係
合軸部を設け、ウォームギヤに、上記駆動軸の係合軸部
が備える２面巾部と係合するスリットを備えた係合軸部
を設け、ウォームギヤに軸受を固定するナットを該ウォ
ームギヤの外周に螺合し、ウォームギヤの係合軸部の外
周に嵌合する嵌合リングを該ナットに備えたものであ
る。According to a first aspect of the present invention, an electric motor is fixed to a housing, a worm gear is supported on the housing via a bearing, and a worm gear is connected to a drive shaft on the side of the electric motor. In the power steering device, an engagement shaft portion having a two-plane width portion is provided on a drive shaft on the side of the electric motor, and a worm gear is provided with a slit engaged with the two-plane width portion provided in the engagement shaft portion of the drive shaft. An engagement shaft portion is provided, a nut for fixing a bearing to the worm gear is screwed to the outer periphery of the worm gear, and the nut is provided with a fitting ring fitted to the outer periphery of the engagement shaft portion of the worm gear.
【０００７】請求項２の発明は、電動モータをハウジン
グに固定し、該ハウジングに軸受を介してウォームギヤ
を支持し、電動モータの側の駆動軸にウォームギヤを結
合してなるパワーステアリング装置において、電動モー
タの側の駆動軸に嵌合軸部を設けるとともに、２面巾部
を備えた係合軸部を設け、ウォームギヤに、上記駆動軸
の嵌合軸部とインロー結合する嵌合孔を備えた嵌合軸部
を設けるとともに、上記駆動軸の係合軸部が備える２面
巾部と係合するスリットを備えた係合軸部を設け、ウォ
ームギヤに軸受を固定するナットを該ウォームギヤの外
周に螺合し、ウォームギヤの係合軸部の外周に嵌合する
嵌合リングを該ナットに備えたものである。According to a second aspect of the present invention, there is provided a power steering apparatus comprising an electric motor fixed to a housing, a worm gear supported on the housing via a bearing, and a worm gear coupled to a drive shaft on the side of the electric motor. A fitting shaft portion is provided on the drive shaft on the side of the motor, an engagement shaft portion having a two-sided width portion is provided, and a worm gear is provided with a fitting hole for engaging with the fitting shaft portion of the drive shaft. An engaging shaft portion is provided, and an engaging shaft portion having a slit that engages with a two-width portion of the engaging shaft portion of the drive shaft is provided, and a nut for fixing a bearing to the worm gear is screwed onto an outer periphery of the worm gear. The nut is provided with a fitting ring fitted on the outer periphery of the engaging shaft portion of the worm gear.
【０００８】[0008]
【作用】電動モータの側の駆動軸に設けた嵌合軸部
と、ウォームギヤに設けた嵌合軸部の嵌合孔とをインロ
ー結合することにより、同芯結合精度を向上できる。軸
と孔の加工も容易に切削加工できてコスト高にもならな
い。According to the present invention, the fitting shaft portion provided on the drive shaft on the side of the electric motor and the fitting hole of the fitting shaft portion provided on the worm gear are spigot-coupled, whereby concentric coupling accuracy can be improved. Shafts and holes can also be easily cut without increasing costs.
【０００９】電動モータの側の駆動軸に設けた係合軸
部の２面巾部を、ウォームギヤに設けた係合軸部のスリ
ットに係合することにより、組付けが容易であり、２面
巾部とスリットも容易に切削加工できてコスト高にもな
らない。The two-face width part of the engaging shaft part provided on the drive shaft on the side of the electric motor is engaged with the slit of the engaging shaft part provided on the worm gear, so that the assembling is easy and the two-face width part is provided. And the slit can be easily cut, and the cost does not increase.
【００１０】ウォームギヤの外周に螺合するナットの
嵌合リングをウォームギヤの係合軸部に嵌合することに
より、ウォームギヤの係合軸部に備えたスリットを補強
でき、ウォームギヤの係合軸部を細径コンパクトにしな
がら高結合強度を維持できる。The slit provided on the engaging shaft of the worm gear can be reinforced by fitting a fitting ring of a nut screwed onto the outer periphery of the worm gear to the engaging shaft of the worm gear, and the engaging shaft of the worm gear can be connected to the worm gear. High bonding strength can be maintained while keeping the diameter small.
【００１１】ウォームギヤの嵌合軸部の外周に螺合す
るナットに、嵌合リングを一体に設けてあるから、ナッ
トのねじ部の加工と嵌合リングの内周の加工を同時に行
なうことができ、加工性が良い。ナットのねじ部と嵌合
リングの同芯度の確保も容易であり、ナットとウォーム
ギヤと駆動軸の組立状態下で、ナットの嵌合リングとウ
ォームギヤの嵌合孔と駆動軸の嵌合軸部の３者の同芯結
合精度を向上できる。Since the fitting ring is provided integrally with the nut screwed to the outer periphery of the fitting shaft portion of the worm gear, it is possible to simultaneously machine the thread portion of the nut and the inner periphery of the fitting ring. Good workability. It is easy to ensure the concentricity of the nut thread and the fitting ring. Under the assembled state of the nut, worm gear and drive shaft, the nut fitting ring and the worm gear fitting hole and the drive shaft fitting shaft The concentric coupling accuracy of the three can be improved.
【００１２】ウォームギヤに軸受を固定する締結ナッ
トを、ウォームギヤの係合軸部に備えたスリットを補強
する嵌合リングとして兼用するものであり、それらのナ
ットを単一部品化でき、組立性も向上できる。The fastening nut for fixing the bearing to the worm gear is also used as a fitting ring for reinforcing the slit provided in the engaging shaft portion of the worm gear. These nuts can be made into a single part and the assemblability is improved. it can.
【００１３】[0013]
【発明の実施の形態】図１は電動パワーステアリング装
置を示す側面図、図２は図１のII-II線に沿う断面図、
図３は図１のIII-III線に沿う断面図、図４は図３の要
部で駆動軸とウォームギヤの結合部を示す断面図、図５
はモータユニットを示す断面図、図６はウォームギヤを
示し、（Ａ）は全体側面図、（Ｂ）は要部拡大図、
（Ｃ）は（Ａ）のＣ−Ｃ線に沿う断面図、図７はバック
ラッシュ除去筒を示し、（Ａ）は側面図、（Ｂ）は断面
図、図８はナットを示し、（Ａ）は端面図、（Ｂ）は断
面図である。FIG. 1 is a side view showing an electric power steering apparatus, FIG. 2 is a sectional view taken along the line II-II of FIG.
3 is a cross-sectional view taken along the line III-III of FIG. 1, FIG. 4 is a cross-sectional view showing a main part of FIG.
Is a sectional view showing a motor unit, FIG. 6 shows a worm gear, (A) is an overall side view, (B) is an enlarged view of a main part,
(C) is a cross-sectional view taken along line CC of (A), FIG. 7 shows a backlash removing cylinder, (A) is a side view, (B) is a cross-sectional view, and FIG. 8 shows a nut. () Is an end view, and (B) is a sectional view.
【００１４】電動パワーステアリング装置１０は、図１
に示す如く、車両のステアリングホイールから操向車輪
に至るステアリング系に、操舵力アシスト用電動モータ
１１と、舵角比調整用電動モータ１２を設けたものであ
る。ステアリングホイールで入力軸１３に付与された操
舵トルクをトルクセンサ１４で検出し、制御装置１５が
この検出信号に基づいて制御信号を発生し、この制御信
号に基づいて操舵トルクに応じたアシストトルクを電動
モータ１１によりラック軸１６に付加し、ラック軸１６
につながる操向車輪を操舵する。また、車速センサ１７
で検出した車速信号と、変位センサ１８が検出した舵角
比調整装置１９による入力軸１３の偏芯量信号により、
制御装置１５が車速に対応して設定された目標偏芯量と
変位センサ１８からの実偏芯量を一致させるように、電
動モータ１２により舵角比調整装置１９をフィードバッ
ク制御し、舵角比（入力軸１３の回転角αに対する出力
軸３１の回転角βの割合、換言すればステアリングホイ
ールの操舵角に対する操向車輪の操舵角の割合）を制御
する。The electric power steering apparatus 10 is shown in FIG.
As shown in FIG. 1, a steering system from a steering wheel of a vehicle to a steered wheel is provided with a steering force assisting electric motor 11 and a steering angle ratio adjusting electric motor 12. A steering torque applied to the input shaft 13 by the steering wheel is detected by a torque sensor 14, and a control device 15 generates a control signal based on the detection signal, and generates an assist torque corresponding to the steering torque based on the control signal. The rack shaft 16 is added to the rack shaft 16 by the electric motor 11.
Steer the steered wheels that lead to The vehicle speed sensor 17
And the eccentricity amount signal of the input shaft 13 by the steering angle ratio adjusting device 19 detected by the displacement sensor 18
The control device 15 performs feedback control of the steering angle ratio adjusting device 19 by the electric motor 12 so that the target eccentric amount set in accordance with the vehicle speed and the actual eccentric amount from the displacement sensor 18 are matched. (The ratio of the rotation angle β of the output shaft 31 to the rotation angle α of the input shaft 13, in other words, the ratio of the steering angle of the steered wheels to the steering angle of the steering wheel).
【００１５】電動パワーステアリング装置１０は、図２
に示す如く、ステアリングホイールに連結される入力軸
１３が、ギヤハウジング２０に軸受２１を介して回動自
在に支持された支持部材２２の偏芯位置に、軸受２３、
２４を介して回転自在に支持されている。入力軸１３
は、第１入力軸１３Ａと、第２入力軸１３Ｂをトーショ
ンバー１３Ｃにより結合したものであり、操舵トルクが
作用すると第１入力軸１３Ａと第２入力軸１３Ｂの間で
相対ねじり変位を発生する。トルクセンサ１４は、第１
入力軸１３Ａと第２入力軸１３Ｂとに掛け渡され、操舵
トルクを検出する。尚、第１入力軸１３Ａは軸受２３、
上ケース２５Ａを介して支持部材２２に支持され、第２
入力軸１３Ｂは軸受２４、下ケース２５Ｂを介して支持
部材２２に支持されている。The electric power steering device 10 is shown in FIG.
As shown in FIG. 3, an input shaft 13 connected to a steering wheel is provided with a bearing 23 at an eccentric position of a support member 22 rotatably supported by a gear housing 20 via a bearing 21.
It is rotatably supported via 24. Input shaft 13
Is a combination of the first input shaft 13A and the second input shaft 13B by a torsion bar 13C, and generates a relative torsional displacement between the first input shaft 13A and the second input shaft 13B when a steering torque is applied. . The torque sensor 14 has a first
It is bridged between the input shaft 13A and the second input shaft 13B to detect a steering torque. The first input shaft 13A has a bearing 23,
The second case is supported by the support member 22 via the upper case 25A.
The input shaft 13B is supported by the support member 22 via a bearing 24 and a lower case 25B.
【００１６】電動パワーステアリング装置１０は、支持
部材２２に軸受２６を介して中間部材２７を回転自在に
支持し、第２入力軸１３Ｂのギヤ２８Ａと中間部材２７
の内歯ギヤ２８Ｂとを噛合いさせている。そして、中間
部材２７の下面溝２７Ａには、ボール列２９を介して、
出力軸３１に回転力を伝達するスライダ３０の上面溝３
０Ａがスライド自在に係合されている。The electric power steering apparatus 10 rotatably supports the intermediate member 27 on the support member 22 via the bearing 26, and the gear 28A of the second input shaft 13B and the intermediate member 27.
And the internal gear 28B. Then, in the lower surface groove 27A of the intermediate member 27, via the ball row 29,
Upper surface groove 3 of slider 30 transmitting torque to output shaft 31
0A is slidably engaged.
【００１７】電動パワーステアリング装置１０は、ステ
アリングホイールの回転運動を直線運動に変換すべく、
ラック軸１６のラック１６Ａに噛合いしたピニオン３１
Ａを備える出力軸３１を、軸受３２、３３を介してギヤ
ハウジング２０に回転自在に支持している。出力軸３１
の上端部には、出力軸３１の中心から偏芯した孔に、ス
ライダ３０の偏芯ピン３０Ｂがニードル軸受３４、スラ
スト軸受３５を介して嵌合している。The electric power steering apparatus 10 converts the rotational movement of the steering wheel into a linear movement.
Pinion 31 meshed with rack 16A of rack shaft 16
The output shaft 31 provided with A is rotatably supported by the gear housing 20 via bearings 32 and 33. Output shaft 31
The eccentric pin 30 </ b> B of the slider 30 is fitted in a hole eccentric from the center of the output shaft 31 via a needle bearing 34 and a thrust bearing 35 at the upper end of the output shaft 31.
【００１８】電動パワーステアリング装置１０は、図
２、図３に示す如く、支持部材２２の外周の一部に、扇
形の部分的ウォームホイール４１を形成し、このウォー
ムホイール４１には、電動モータ１２により駆動される
ウォームギヤ４２が噛合いしており、支持部材２２に所
定の角度範囲に渡る回転運動を与える。尚、ウォームギ
ヤ４２は、偏芯カムを利用した図７に示すバックラッシ
ュ除去筒４３を介してギヤハウジング２０に支持され、
バックラッシュ除去筒４３の端部に設けた係合部４３Ａ
に工具を係合してこれをギヤハウジング２０に対して回
動させることにより、ウォームホイール４１に対するウ
ォームギヤ４２の噛合い隙間を調整できる。As shown in FIGS. 2 and 3, the electric power steering apparatus 10 has a fan-shaped partial worm wheel 41 formed on a part of the outer periphery of the support member 22, and the worm wheel 41 The worm gear 42 driven by the gears meshes with each other, and gives a rotational movement to the support member 22 over a predetermined angular range. The worm gear 42 is supported by the gear housing 20 via a backlash removing cylinder 43 shown in FIG. 7 using an eccentric cam.
Engaging portion 43A provided at end of backlash removing cylinder 43
By engaging a tool with the worm gear and rotating the tool with respect to the gear housing 20, the mesh gap of the worm gear with respect to the worm wheel 41 can be adjusted.
【００１９】このとき、ウォームギヤ４２は軸受４４、
ニードル軸受４５を介してバックラッシュ除去筒４３に
支持され、ギヤハウジング２０に螺合されるロックスク
リュー４６により軸受４４の外輪とともにバックラッシ
ュ除去筒４３が固定され、ウォームギヤ４２に螺合され
るナット４７により軸受４４の内輪はウォームギヤ４２
のフランジ４８に固定される。At this time, the worm gear 42 has a bearing 44,
The backlash removing cylinder 43 is supported together with the outer ring of the bearing 44 by a lock screw 46 screwed to the gear housing 20 and supported by the backlash removing cylinder 43 via a needle bearing 45, and a nut 47 screwed to the worm gear 42. As a result, the inner ring of the bearing 44 is
Is fixed to the flange 48.
【００２０】電動モータ１２は、図５に示す如く、モー
タハウジング５０に内蔵される減速歯車とともにユニッ
ト化され、ボルト５２によりギヤハウジング２０に固定
される。そして、電動モータ１２の側の駆動軸５３をウ
ォームギヤ４２に後述する如くに結合し、ウォームギヤ
４２、ひいてはウォームホイール４１を備える支持部材
２２に回転運動を与える。ギヤハウジング２０には差動
トランス等からなる前述の変位センサ１８が取付けら
れ、支持部材２２の回転角度を検出する。電動モータ１
２、変位センサ１８、支持部材２２等は舵角比調整装置
１９を構成する。As shown in FIG. 5, the electric motor 12 is unitized with a reduction gear built in the motor housing 50, and is fixed to the gear housing 20 by bolts 52. Then, the drive shaft 53 on the side of the electric motor 12 is coupled to the worm gear 42 as described later, and imparts a rotational motion to the worm gear 42 and thus the support member 22 having the worm wheel 41. The above-described displacement sensor 18 composed of a differential transformer or the like is attached to the gear housing 20 and detects the rotation angle of the support member 22. Electric motor 1
2. The displacement sensor 18, the support member 22 and the like constitute a steering angle ratio adjusting device 19.
【００２１】電動パワーステアリング装置１０におい
て、入力軸１３を回転させると、スライダ３０は、入力
軸１３の側の中間部材２７との係合により、出力軸３１
の中芯軸まわりでクランク回転する。ここで、舵角比調
整装置１９の電動モータ１２によりウォームギヤ４２、
ウォームホイール４１を介して支持部材２２を回動させ
ると、支持部材２２の偏芯カム作用により、入力軸１３
の軸芯位置が変化する。これにより、入力軸１３と出力
軸３１の軸間の偏位量を適宜に定め、入力軸１３と出力
軸３１の軸芯同士を互いに偏芯させると、入力軸１３と
出力軸３１の回転角が不一致となる。しかも、入力１３
を等角度ずつ回転させたときの出力軸３１の角度変化率
が漸次増大するものとなる。従って、舵角比調整装置１
９により入力軸１３と出力軸３１の偏位量を変化させる
ことにより、入力軸１３の回転角αに対する出力軸３１
の回転角βの割合（β／α）、即ち、舵角比を変化させ
ることができる。車両の低速域ではステアリングホイー
ルの操舵角αに対するラック軸１６のラックストローク
を大きくして敏感（シャープ）な舵角比特性を実現で
き、高速域ではステアリングホイールの操舵角αに対す
るラック軸１６のラックストロークを幾分小さくして鈍
感（安定）な舵角比特性を実現できる。In the electric power steering apparatus 10, when the input shaft 13 is rotated, the slider 30 is engaged with the intermediate member 27 on the side of the input shaft 13 so that the output shaft 31 is rotated.
Crank around the center axis. Here, the electric motor 12 of the steering angle ratio adjusting device 19 causes the worm gear 42,
When the support member 22 is rotated via the worm wheel 41, the eccentric cam action of the support member 22 causes the input shaft 13 to rotate.
Axis position changes. Thereby, the amount of deviation between the axes of the input shaft 13 and the output shaft 31 is appropriately determined, and when the axes of the input shaft 13 and the output shaft 31 are decentered from each other, the rotation angle of the input shaft 13 and the output shaft 31 is changed. Do not match. And input 13
Are gradually increased by an equal angle at a time. Therefore, the steering angle ratio adjusting device 1
By changing the amount of deviation between the input shaft 13 and the output shaft 31 according to FIG.
Of the rotation angle β (β / α), that is, the steering angle ratio can be changed. In the low speed range of the vehicle, the rack stroke of the rack shaft 16 with respect to the steering angle α of the steering wheel can be increased to realize a sensitive (sharp) steering angle ratio characteristic. In the high speed range, the rack of the rack shaft 16 with respect to the steering angle α of the steering wheel can be realized. By making the stroke somewhat smaller, an insensitive (stable) steering angle ratio characteristic can be realized.
【００２２】しかるに、電動パワーステアリング装置１
０にあっては、電動モータ１２の側の駆動軸５３と、ウ
ォームギヤ４２との結合構造を以下の如くにしている
（図３〜図６、図８）。However, the electric power steering device 1
0, the coupling structure between the drive shaft 53 on the side of the electric motor 12 and the worm gear 42 is as follows (FIGS. 3 to 6 and 8).
【００２３】(1)モータハウジング５０に軸受５５によ
り支持される駆動軸５３の、モータハウジング５０から
突出する端部に、先端側の嵌合軸部６１と、基端側の２
面巾部６２Ａを備えた係合軸部６２を同芯上に設ける
（図４、図５）。(1) The end of the drive shaft 53 supported by the bearing 55 on the motor housing 50 protruding from the motor housing 50 has a fitting shaft portion 61 on the distal end side and two
An engaging shaft portion 62 having a surface width portion 62A is provided concentrically (FIGS. 4 and 5).
【００２４】(2)ウォームギヤ４２に、駆動軸５３の嵌
合軸部６１とインロー結合する嵌合孔７１Ａを備えた嵌
合軸部７１を設けるとともに、駆動軸５３の係合軸部６
２が備える２面巾部６２Ａと回転方向で係合するスリッ
ト７２Ａを備えた係合軸部７２を同芯上に設ける（図
４、図６）。ウォームギヤ４２のフランジ４８より反ギ
ヤ側の外周には、軸受嵌合部７３と、軸受嵌合部７３の
外側のねじ部７４とが設けられる。(2) The worm gear 42 is provided with a fitting shaft portion 71 having a fitting hole 71A which is spigot-coupled with the fitting shaft portion 61 of the drive shaft 53, and the engagement shaft portion 6 of the drive shaft 53 is provided.
An engaging shaft portion 72 having a slit 72A that engages with a two-plane width portion 62A provided in the rotating member 2 in the rotation direction is provided concentrically (FIGS. 4 and 6). A bearing fitting portion 73 and a screw portion 74 outside the bearing fitting portion 73 are provided on the outer periphery of the worm gear 42 on the side opposite to the gear 48 from the flange 48.
【００２５】(3)ウォームギヤ４２の軸受嵌合部７３に
軸受４４を嵌合し、前述のナット４７をねじ部７４に螺
合し、ナット４７で軸受４４の内輪をウォームギヤ４２
のフランジ４８に固定する。ナット４７は、図８に示す
如く、ウォームギヤ４２のねじ部７４に螺合するねじ部
８１と、ウォームギヤ４２の係合軸部７２（スリット７
２Ａに嵌合する嵌合リング８２を備えるとともに、螺動
工具係合用の２面巾部８３を備える。尚、ウォームギヤ
４２のフランジ４８よりギヤ側の外面には、ナット４７
を螺合するときの固定用２面巾部７５を備える。(3) The bearing 44 is fitted into the bearing fitting portion 73 of the worm gear 42, the nut 47 is screwed into the screw portion 74, and the inner ring of the bearing 44 is
To the flange 48. As shown in FIG. 8, the nut 47 includes a screw portion 81 that is screwed into the screw portion 74 of the worm gear 42, and an engagement shaft portion 72 (slit 7) of the worm gear 42.
It has a fitting ring 82 fitted to 2A and a two-sided width portion 83 for engaging with a screw tool. A nut 47 is provided on the outer surface of the worm gear 42 on the gear side from the flange 48.
Is provided with a two-sided fixing width portion 75 for screwing.
【００２６】(4)上述(3)の軸受４４、ナット４７を設け
たウォームギヤ４２をニードル軸受４５、バックラッシ
ュ除去筒４３に装填し、バックラッシュ除去筒４３をギ
ヤハウジング２０に挿着し、ロックスクリュー４６によ
り軸受４４の外輪、バックラッシュ除去筒４３をギヤハ
ウジング２０に組付け固定する。(4) The worm gear 42 provided with the bearing 44 and the nut 47 described in (3) above is loaded into the needle bearing 45 and the backlash removing cylinder 43, and the backlash removing cylinder 43 is inserted into the gear housing 20 and locked. The outer ring of the bearing 44 and the backlash removing cylinder 43 are assembled and fixed to the gear housing 20 by the screw 46.
【００２７】(5)電動モータ１２のモータハウジング５
０をギヤハウジング２０に固定する際に、電動モータ１
２の側の駆動軸５３の嵌合軸部６１をウォームギヤ４２
の嵌合軸部７１の嵌合孔７１Ａにインロー結合し、駆動
軸５３の係合軸部６２の２面巾部６２Ａをウォームギヤ
４２の係合軸部７２のスリット７２Ａに係合する。この
とき、ウォームギヤ４２の係合軸部７２（スリット７２
Ａ）の外周には、ナット４７の嵌合リング８２が装填さ
れている。(5) Motor housing 5 of electric motor 12
0 is fixed to the gear housing 20, the electric motor 1
The fitting shaft 61 of the drive shaft 53 on the second side is connected to the worm gear 42.
The two-face width portion 62A of the engagement shaft portion 62 of the drive shaft 53 is engaged with the slit 72A of the engagement shaft portion 72 of the worm gear 42. At this time, the engagement shaft portion 72 of the worm gear 42 (slit 72
A fitting ring 82 of the nut 47 is mounted on the outer periphery of A).
【００２８】本実施形態によれば、以下の作用がある。 電動モータ１２の側の駆動軸５３に設けた嵌合軸部６
１と、ウォームギヤ４２に設けた嵌合軸部７１の嵌合孔
７１Ａとをインロー結合することにより、同芯結合精度
を向上できる。軸と孔の加工も容易に切削加工できてコ
スト高にもならない。According to this embodiment, the following operations are provided. Fitting shaft 6 provided on drive shaft 53 on the side of electric motor 12
1 and the fitting hole 71A of the fitting shaft 71 provided in the worm gear 42 are spigot-coupled, so that the concentric coupling accuracy can be improved. Shafts and holes can also be easily cut without increasing costs.
【００２９】電動モータ１２の側の駆動軸５３に設け
た係合軸部６２の２面巾部６２Ａを、ウォームギヤ４２
に設けた係合軸部７２のスリット７２Ａに係合すること
により、高結合強度を確保できる。２面巾部６２Ａとス
リット７２Ａの加工はそれほど高精度を必要とせず容易
に切削加工できてコスト高にもならない。The two width portions 62A of the engagement shaft portion 62 provided on the drive shaft 53 on the side of the electric motor 12 are connected to the worm gear 42.
By engaging with the slit 72A of the engaging shaft portion 72 provided in the above, high coupling strength can be secured. The processing of the two-face width portion 62A and the slit 72A does not require so high precision and can be easily cut, and does not increase the cost.
【００３０】ウォームギヤ４２の外周に螺合するナッ
ト４７の嵌合リング８２をウォームギヤ４２の係合軸部
７２に嵌合することにより、ウォームギヤ４２の係合軸
部７２に備えたスリット７２Ａを外周から補強でき、ウ
ォームギヤ４２の係合軸部７２を細径コンパクトにしな
がら高結合強度を維持できる。By fitting a fitting ring 82 of a nut 47 screwed to the outer periphery of the worm gear 42 to the engaging shaft portion 72 of the worm gear 42, a slit 72A provided in the engaging shaft portion 72 of the worm gear 42 is formed from the outer periphery. It is possible to reinforce and maintain high coupling strength while making the engaging shaft portion 72 of the worm gear 42 small and compact.
【００３１】ウォームギヤ４２の嵌合軸部７１の外周
に螺合するナット４７に、嵌合リング８２を一体に設け
てあるから、ナット４７のねじ部８１の加工と嵌合リン
グ８２の内周の加工を同時に行なうことができ、加工性
が良い。ナット４７のねじ部８１と嵌合リング８２の同
芯度の確保も容易であり、組付けが良く、ナット４７と
ウォームギヤ４２と駆動軸５３の組立状態下で、ナット
４７の嵌合リング８２とウォームギヤ４２の嵌合孔７１
Ａと駆動軸５３の嵌合軸部６１の３者の同芯結合精度を
向上できる。Since the fitting ring 82 is provided integrally with the nut 47 screwed to the outer periphery of the fitting shaft 71 of the worm gear 42, the processing of the threaded portion 81 of the nut 47 and the inner circumference of the fitting ring 82 Processing can be performed simultaneously, and workability is good. It is easy to secure the concentricity of the screw portion 81 of the nut 47 and the fitting ring 82, and the assembly is good. When the nut 47, the worm gear 42 and the drive shaft 53 are assembled, the fitting ring 82 of the nut 47 Fitting hole 71 of worm gear 42
The concentric coupling accuracy of the three members A and the fitting shaft portion 61 of the drive shaft 53 can be improved.
【００３２】ウォームギヤ４２に軸受４４を固定する
締結ナット４７を、ウォームギヤ４２の係合軸部７２に
備えたスリット７２Ａを補強する嵌合リング８２として
兼用するものであり、それらのナット４７を単一部品化
でき、組立性も向上できる。The fastening nut 47 for fixing the bearing 44 to the worm gear 42 is also used as a fitting ring 82 for reinforcing the slit 72A provided in the engaging shaft portion 72 of the worm gear 42. It can be made into parts and the assemblability can be improved.
【００３３】尚、本発明は、特願2000-183607に記載さ
れた如くの操舵力アシスト用電動モータの側の駆動軸と
ウォームギヤとを結合するウォーム減速構造においても
適用できる。The present invention can also be applied to a worm reduction structure in which a drive shaft on the side of a steering force assisting electric motor and a worm gear are connected as described in Japanese Patent Application No. 2000-183607.
【００３４】以上、本発明の実施の形態を図面により詳
述したが、本発明の具体的な構成はこの実施の形態に限
られるものではなく、本発明の要旨を逸脱しない範囲の
設計の変更等があっても本発明に含まれる。例えば、２
面巾部は断面四角形状でも良く、嵌合リングは圧入もし
くは、隙間ばめにより係合軸部に嵌着されても良い。The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention. For example, 2
The surface width portion may have a rectangular cross section, and the fitting ring may be fitted to the engagement shaft portion by press fitting or clearance fitting.
【００３５】[0035]
【発明の効果】以上のように本発明によれば、パワース
テアリング装置において、電動モータの側の駆動軸とウ
ォームギヤとを結合するに際し、同芯結合精度を向上す
るとともに、コンパクトにしながら高結合強度を確保
し、コストも低減できる。As described above, according to the present invention, in the power steering apparatus, when the drive shaft on the side of the electric motor and the worm gear are connected, the concentric connection accuracy is improved, and the compactness and high connection strength are achieved. And cost can be reduced.
【図１】図１は電動パワーステアリング装置を示す側面
図である。FIG. 1 is a side view showing an electric power steering device.
【図２】図２は図１のII-II線に沿う断面図である。FIG. 2 is a cross-sectional view taken along the line II-II of FIG.
【図３】図３は図１のIII-III線に沿う断面図である。FIG. 3 is a sectional view taken along line III-III in FIG.
【図４】図４は図３の要部で駆動軸とウォームギヤの結
合部を示す断面図である。FIG. 4 is a cross-sectional view showing a main part of FIG. 3 showing a coupling portion between a drive shaft and a worm gear.
【図５】図５はモータユニットを示す断面図である。FIG. 5 is a sectional view showing a motor unit.
【図６】図６はウォームギヤを示し、（Ａ）は全体側面
図、（Ｂ）は要部拡大図、（Ｃ）は（Ａ）のＣ−Ｃ線に
沿う断面図である。6A and 6B show a worm gear; FIG. 6A is an overall side view, FIG. 6B is an enlarged view of a main part, and FIG. 6C is a cross-sectional view taken along line CC of FIG.
【図７】図７はバックラッシュ除去筒を示し、（Ａ）は
側面図、（Ｂ）は断面図である。7A and 7B show a backlash removing cylinder, wherein FIG. 7A is a side view and FIG. 7B is a sectional view.
【図８】図８はナットを示し、（Ａ）は端面図、（Ｂ）
は断面図である。FIG. 8 shows a nut, (A) is an end view, (B)
Is a sectional view.
１０ パワーステアリング装置 １２ 電動モータ ４２ ウォームギヤ ４７ ナット ５３ 駆動軸 ６１ 嵌合軸部 ６２ 係合軸部 ６２Ａ ２面巾部 ７１ 嵌合軸部 ７１Ａ 嵌合孔 ７２ 係合軸部 ７２Ａ スリット ８２ 嵌合リング Reference Signs List 10 power steering device 12 electric motor 42 worm gear 47 nut 53 drive shaft 61 fitting shaft portion 62 engaging shaft portion 62A two-face width portion 71 fitting shaft portion 71A fitting hole 72 engaging shaft portion 72A slit 82 fitting ring
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ６２Ｄ 113:00 Ｂ６２Ｄ 119:00 119:00 Ｆ１６Ｄ 1/02 Ｌ (72)発明者 鎌田 紀之 栃木県芳賀郡芳賀町芳賀台112番地１ 株 式会社ショーワ栃木開発センター内 (72)発明者 木下 裕 栃木県芳賀郡芳賀町芳賀台112番地１ 株 式会社ショーワ栃木開発センター内 Ｆターム(参考） 3D032 CC48 CC50 DA15 DA16 DA23 DB11 DD17 EB05 EC22 EC31 GG01 3D033 CA03 CA04 CA13 CA15 CA16 CA21 3J009 DA02 DA16 DA17 DA18 EA19 EA23 EC07 FA08 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme court ゛ (Reference) B62D 113: 00 B62D 119: 00 119: 00 F16D 1/02 L (72) Inventor Noriyuki Kamada Haga-gun, Tochigi 112-1, Hagadai, Haga-cho, Japan Showa Tochigi Development Center Co., Ltd. (72) Inventor Hiroshi Kinoshita 112, Hagadai, Haga-cho, Haga-gun, Tochigi Pref. DA16 DA23 DB11 DD17 EB05 EC22 EC31 GG01 3D033 CA03 CA04 CA13 CA15 CA16 CA21 3J009 DA02 DA16 DA17 DA18 EA19 EA23 EC07 FA08
Claims (2)
ウジングに軸受を介してウォームギヤを支持し、電動モ
ータの側の駆動軸にウォームギヤを結合してなるパワー
ステアリング装置において、 電動モータの側の駆動軸に２面巾部を備えた係合軸部を
設け、 ウォームギヤに、上記駆動軸の係合軸部が備える２面巾
部と係合するスリットを備えた係合軸部を設け、 ウォームギヤに軸受を固定するナットを該ウォームギヤ
の外周に螺合し、ウォームギヤの係合軸部の外周に嵌合
する嵌合リングを該ナットに備えたことを特徴とするパ
ワ−ステアリング装置。1. A power steering device comprising an electric motor fixed to a housing, a worm gear supported on the housing via a bearing, and a worm gear coupled to a drive shaft on the electric motor side. A shaft is provided with an engagement shaft portion having a two-sided width portion, a worm gear is provided with an engagement shaft portion provided with a slit for engaging with the two-sided width portion provided on the engagement shaft portion of the drive shaft, and a bearing is provided on the worm gear. A power steering device comprising: a nut to be fixed is screwed onto an outer periphery of the worm gear; and a fitting ring is fitted to the outer periphery of an engagement shaft portion of the worm gear.
ウジングに軸受を介してウォームギヤを支持し、 電動モータの側の駆動軸にウォームギヤを結合してなる
パワーステアリング装置において、 電動モータの側の駆動軸に嵌合軸部を設けるとともに、
２面巾部を備えた係合軸部を設け、 ウォームギヤに、上記駆動軸の嵌合軸部とインロー結合
する嵌合孔を備えた嵌合軸部を設けるとともに、上記駆
動軸の係合軸部が備える２面巾部と係合するスリットを
備えた係合軸部を設け、 ウォームギヤに軸受を固定するナットを該ウォームギヤ
の外周に螺合し、ウォームギヤの係合軸部の外周に嵌合
する嵌合リングを該ナットに備えたことを特徴とするパ
ワーステアリング装置。2. A power steering apparatus comprising: an electric motor fixed to a housing; a worm gear supported by the housing via a bearing; and a worm gear coupled to a drive shaft on the electric motor side. The fitting shaft part is provided on the shaft,
An engaging shaft portion having a two-sided width portion is provided, and a worm gear is provided with a fitting shaft portion having a fitting hole to be spliced with the fitting shaft portion of the drive shaft, and the engaging shaft portion of the drive shaft is provided. An engaging shaft portion having a slit that engages with the two-face width portion provided in the worm gear is provided. A nut for fixing a bearing to the worm gear is screwed around the outer periphery of the worm gear, and fitted to the outer periphery of the engaging shaft portion of the worm gear. A power steering device comprising a coupling ring provided on the nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000241806A JP4504531B2 (en) | 2000-08-09 | 2000-08-09 | Power steering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000241806A JP4504531B2 (en) | 2000-08-09 | 2000-08-09 | Power steering device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002053053A true JP2002053053A (en) | 2002-02-19 |
| JP4504531B2 JP4504531B2 (en) | 2010-07-14 |
Family
ID=18732939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000241806A Expired - Fee Related JP4504531B2 (en) | 2000-08-09 | 2000-08-09 | Power steering device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4504531B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006205941A (en) * | 2005-01-28 | 2006-08-10 | Showa Corp | Steering shaft support structure for power steering assisting device |
| JP2006205939A (en) * | 2005-01-28 | 2006-08-10 | Showa Corp | Steering shaft support structure for power steering assisting device |
| JP2006205940A (en) * | 2005-01-28 | 2006-08-10 | Showa Corp | Steering shaft support structure for power steering assisting device |
| US7909129B2 (en) | 2005-01-28 | 2011-03-22 | Showa Corporation | Steering shaft support structure of motor-driven steering assist apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0462279U (en) * | 1990-10-09 | 1992-05-28 | ||
| JPH0639665U (en) * | 1992-10-30 | 1994-05-27 | 日本精工株式会社 | Electric power steering device |
| JPH0833270A (en) * | 1994-07-14 | 1996-02-02 | Koyo Seiko Co Ltd | Prime motor with reduction gear |
| JPH10100912A (en) * | 1996-09-30 | 1998-04-21 | Yamada Seisakusho Kk | Assistant torque transmitting mechanism for motor-driven power steering |
| JPH11308805A (en) * | 1998-04-24 | 1999-11-05 | Nippon Seiko Kk | Linear actuator provided with worm speed reducer |
-
2000
- 2000-08-09 JP JP2000241806A patent/JP4504531B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0462279U (en) * | 1990-10-09 | 1992-05-28 | ||
| JPH0639665U (en) * | 1992-10-30 | 1994-05-27 | 日本精工株式会社 | Electric power steering device |
| JPH0833270A (en) * | 1994-07-14 | 1996-02-02 | Koyo Seiko Co Ltd | Prime motor with reduction gear |
| JPH10100912A (en) * | 1996-09-30 | 1998-04-21 | Yamada Seisakusho Kk | Assistant torque transmitting mechanism for motor-driven power steering |
| JPH11308805A (en) * | 1998-04-24 | 1999-11-05 | Nippon Seiko Kk | Linear actuator provided with worm speed reducer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006205941A (en) * | 2005-01-28 | 2006-08-10 | Showa Corp | Steering shaft support structure for power steering assisting device |
| JP2006205939A (en) * | 2005-01-28 | 2006-08-10 | Showa Corp | Steering shaft support structure for power steering assisting device |
| JP2006205940A (en) * | 2005-01-28 | 2006-08-10 | Showa Corp | Steering shaft support structure for power steering assisting device |
| JP4620478B2 (en) * | 2005-01-28 | 2011-01-26 | 株式会社ショーワ | Steering shaft support structure for electric steering assist device for rough terrain vehicle |
| US7909129B2 (en) | 2005-01-28 | 2011-03-22 | Showa Corporation | Steering shaft support structure of motor-driven steering assist apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4504531B2 (en) | 2010-07-14 |
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