JPH09123927A - Motor-driven power steering device - Google Patents

Motor-driven power steering device

Info

Publication number
JPH09123927A
JPH09123927A JP7285799A JP28579995A JPH09123927A JP H09123927 A JPH09123927 A JP H09123927A JP 7285799 A JP7285799 A JP 7285799A JP 28579995 A JP28579995 A JP 28579995A JP H09123927 A JPH09123927 A JP H09123927A
Authority
JP
Japan
Prior art keywords
rack shaft
ball nut
shaft
housing
ball
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Withdrawn
Application number
JP7285799A
Other languages
Japanese (ja)
Inventor
Atsushi Tanaka
敦司 田中
Kenji Someya
賢司 染谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NSK Ltd
Original Assignee
NSK Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NSK Ltd filed Critical NSK Ltd
Priority to JP7285799A priority Critical patent/JPH09123927A/en
Publication of JPH09123927A publication Critical patent/JPH09123927A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0442—Conversion of rotational into longitudinal movement
    • B62D5/0445—Screw drives
    • B62D5/0448—Ball nuts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0421—Electric motor acting on or near steering gear

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

PROBLEM TO BE SOLVED: To maintain proper pre-load at a bearing for supporting a ball screw mechanism at all times by forming a motor-driven assist steering part out of the ball screw mechanism which involves a threaded shaft consisting of a part of rack shaft, a reduction gear provided between the output shaft of a motor and a ball nut and so on. SOLUTION: A manual steering part 14 makes a rack shaft 10 go straight through a rack and pinion mechanism by the rotating steering of a steering wheel. An assist steering part 20 rotates a ball nut 40 through bevel gears 28, 52 by the rotational force of a motor 22, by which a threaded shaft 34, or a rack shaft 10 is moved in the axial direction for front wheel steering through a number of balls 36. The ball nut 40 is stored in a housing 12 through a nut holder 44 formed out of the same metallic material as the ball nut 40, so that the expansion amount of the ball nut 40 is equal to that of the nut holder 44 at the time of temperature change, and pre-load set by a pre-load adjusting screw 56 can be maintained over a long period.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、車両において手動
操舵力を補助する電動式補助操舵部を備えた電動パワー
ステアリング装置、特にボールねじ機構を支承する軸受
に適正な予圧が維持でき、また電動モータがラック軸に
対して斜め方向に配置されても電動モータとボールねじ
機構との間の傘歯車のバックラッシュを容易に調整でき
るものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric power steering apparatus provided with an electric auxiliary steering section for assisting a manual steering force in a vehicle, and in particular, to maintain a proper preload on a bearing supporting a ball screw mechanism, The present invention relates to a backlash of a bevel gear between an electric motor and a ball screw mechanism that can be easily adjusted even when the motor is arranged in an oblique direction with respect to a rack shaft.

【０００２】[0002]

【発明が解決しようとする課題】電動パワーステアリン
グ装置においては、両端において各前輪に連結され手動
操舵装置により車両の左右方向に移動されるラック軸
に、電動式補助操舵部において電動モータの回転力を種
々の変換機構を介して伝達して移動するようになってい
る。変換機構はラック軸のまわりにナット部材を遊嵌
し、電動モータの回転でこのナット部材を回転させてラ
ック軸を軸方向に移動させることを基本的な構成とす
る。従来例の一つとして、特開昭６０−２５８５３号に
開示されたものが知られている。これは、電動モータを
ラック軸と平行に配置し、ラック軸に螺合したナットの
両端をハウジングに対して軸受で支承し、電動モータの
回転を減速ギヤーを介してナット部材に伝達するもので
ある。In an electric power steering system, a rack shaft that is connected to each front wheel at both ends and is moved in the left and right direction of the vehicle by a manual steering system is mounted on a rack shaft that is driven by a manual steering system. Are transmitted via various conversion mechanisms and moved. The conversion mechanism has a basic configuration in which a nut member is loosely fitted around the rack shaft, and the nut shaft is rotated by the rotation of the electric motor to move the rack shaft in the axial direction. As one of the conventional examples, the one disclosed in JP-A-60-25853 is known. This is to arrange the electric motor in parallel with the rack shaft, to support both ends of the nut screwed to the rack shaft with bearings to the housing, and to transmit the rotation of the electric motor to the nut member via the reduction gear. is there.

【０００３】ここで、電動モータの回転をラック軸の直
進運動に変換する変換機構としてボールねじ機構を利用
したものがある。この場合、ボールナットは通常その両
端を玉軸受で支承され、この軸受に予圧をかけることが
行われている。しかし、ボールナットの金属材料とハウ
ジングの金属材料に特別の注意が扱われていなかったの
で、周辺温度が変化したときに両者の伸縮量が異なり、
予圧が抜けたり、過大になることがあった。また、電動
モータや動力変換機構周辺の装置、機器との関係で、ラ
ック軸と電動モータとが一定の軸交角をもって配置され
ることがある。この場合、電動モータとナット部材とは
一対の傘歯車で連結されるが、この傘歯車にバックラッ
シュが発生する。Here, there is one that uses a ball screw mechanism as a conversion mechanism for converting the rotation of the electric motor into the linear movement of the rack shaft. In this case, the ball nut is normally supported by ball bearings at both ends, and preload is applied to this bearing. However, since no special attention was paid to the metal material of the ball nut and the metal material of the housing, the expansion and contraction amounts of the two differ when the ambient temperature changes,
The preload was sometimes lost or excessive. Further, the rack shaft and the electric motor may be arranged at a constant axial intersection angle due to the relationship with the devices and equipment around the electric motor and the power conversion mechanism. In this case, the electric motor and the nut member are connected by a pair of bevel gears, but backlash occurs in this bevel gear.

【０００４】本発明は上記事情を背景になされたもので
あり、第１には電動モータの回転をボールねじ機構によ
りラック軸の直進運動に変換する場合にも、ボールナッ
トの両端を支承する軸受の予圧が周辺温度が変化しても
抜けず、第２には電動モータとラック軸とが一定の軸交
角をもって配置され一対の傘歯車で連結された場合も、
傘歯車に発生するバックラッシュが容易に調整できる電
動パワーステアリング装置を提供することを目的として
なされたものである。The present invention has been made in view of the above circumstances. Firstly, a bearing that supports both ends of a ball nut even when the rotation of an electric motor is converted into a linear movement of a rack shaft by a ball screw mechanism. Even if the preload is not removed even when the ambient temperature changes, and secondly, when the electric motor and the rack shaft are arranged with a constant axial intersection angle and connected by a pair of bevel gears,
The purpose of the present invention is to provide an electric power steering device capable of easily adjusting a backlash generated in a bevel gear.

【０００５】[0005]

【課題を解決するための手段】上記目的を達成するため
に、本願の第１の発明では、その両端において車両の転
舵輪に連結されて車両の左右方向に延びるラック軸と、
該ラック軸を軸方向に移動可能に収容するハウジング
と、前記ラック軸に手動操舵力を入力する手動操舵部
と、前記ラック軸に電動補助操舵力を入力する電動式補
助操舵部と、を含む電動パワーステアリング装置におい
て、前記電動式補助操舵部を、前記ハウジングに取り付
けられた電動モータと、前記ラック軸の一部から成るね
じ軸と、これに多数のボールを介して装着されたボール
ナットとを含むボールねじ機構と、前記ボールナットと
同じ金属材料から成って前記ハウジングの内周面に装着
され、一対の軸受によって前記ボールナットを回転可能
に支承するナットホルダと、前記電動モータの出力軸と
前記ボールナットとの間に介装された減速歯車と、で構
成した。これによって、前記一対の軸受に加わる予圧が
所定の大きさに維持できることとなる。In order to achieve the above object, in the first invention of the present application, a rack shaft, which is connected at both ends thereof to steered wheels of a vehicle and extends in the left-right direction of the vehicle,
A housing for accommodating the rack shaft so as to be movable in the axial direction; a manual steering unit for inputting a manual steering force to the rack shaft; and an electric auxiliary steering unit for inputting an electric auxiliary steering force to the rack shaft. In the electric power steering apparatus, the electric auxiliary steering section includes an electric motor mounted on the housing, a screw shaft formed of a part of the rack shaft, and a ball nut mounted on the screw shaft via a large number of balls. A ball screw mechanism including a ball nut mechanism, a nut holder made of the same metal material as that of the ball nut, mounted on an inner peripheral surface of the housing, and rotatably supporting the ball nut by a pair of bearings, and an output shaft of the electric motor. And a reduction gear interposed between the ball nut and the ball nut. As a result, the preload applied to the pair of bearings can be maintained at a predetermined level.

【０００６】本願の第２の発明では、その両端において
車両の転舵輪に連結されて車両の左右方向に延びるラッ
ク軸と、該ラック軸を軸方向に移動可能に収容するハウ
ジングと、前記ラック軸に手動操舵力を入力する手動操
舵部と、前記ラック軸に電動補助操舵力を入力する電動
式補助操舵部と、を含む電動パワーステアリング装置に
おいて、前記電動式補助操舵部を、その出力軸が前記ラ
ック軸と一定の軸交角をなすように前記ハウジングに取
り付けられた電動モータと、前記ラック軸の一部から成
るねじ軸と、これに多数のボールを介して装着されたボ
ールナットとを含むボールねじ機構と、前記ハウジング
の内周面に装着され一対の軸受によって前記ボールナッ
トを回転可能に支承するナットホルダと、前記電動モー
タの出力軸と前記ボールナットとの間に介装された一対
の傘歯車と、で構成した。これによって、前記一対の傘
歯車に生ずるバックラッシュが容易に調整できることと
なる。In the second invention of the present application, a rack shaft connected to the steered wheels of the vehicle at both ends thereof and extending in the left-right direction of the vehicle, a housing for accommodating the rack shaft so as to be axially movable, and the rack shaft. In an electric power steering device including a manual steering unit for inputting a manual steering force to the rack shaft and an electric auxiliary steering unit for inputting an electric auxiliary steering force to the rack shaft, the output shaft of the electric auxiliary steering unit is An electric motor mounted on the housing so as to form a constant axis intersection angle with the rack shaft, a screw shaft formed of a part of the rack shaft, and a ball nut mounted on the screw shaft through a large number of balls. A ball screw mechanism; a nut holder mounted on the inner peripheral surface of the housing to rotatably support the ball nut by a pair of bearings; an output shaft of the electric motor; A pair of bevel gears interposed between the Runatto, in the configuration. Thereby, the backlash generated in the pair of bevel gears can be easily adjusted.

【０００７】[0007]

【実施の形態】以下、本発明の実施の形態につき、図面
をもとに説明する。図１において、アルミニウム製のハ
ウジング１２内に収容されたラック軸１０は車両の左右
方向に延び、その両端においてボールジョイント等を介
して前輪（不図示）に連結されている。ラック軸１０の
右方寄りの部分には手動操舵部１４が設けられており、
ステアリングホイールにより回転されるピニオン軸１６
の先端に結合されたピニオンギヤーが、ラック軸１０に
形成されたラックギヤー（何れも図示せず）に噛合して
成る。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a rack shaft 10 housed in a housing 12 made of aluminum extends in the left-right direction of the vehicle and is connected at its both ends to front wheels (not shown) via ball joints and the like. A manual steering unit 14 is provided on the right side of the rack shaft 10,
Pinion shaft 16 rotated by the steering wheel
A pinion gear coupled to the tip of the gear meshes with a rack gear (neither is shown) formed on the rack shaft 10.

【０００８】ラック軸１０の中間部から左方寄りの部分
には電動モータ２２とボールねじ機構３０とを含む電動
式の補助操舵部２０が設けられている。電動モータ２２
は出力軸２４がラック軸と一定の軸交角をもつように
（手動操舵部１４とは反対側に傾斜して）配置されてい
る。出力軸２４は軸受２６により回転可能に支承されて
おり、その先端には傘歯車２８が固定されている。An electric auxiliary steering portion 20 including an electric motor 22 and a ball screw mechanism 30 is provided in a portion of the rack shaft 10 located to the left of the middle portion. Electric motor 22
Is arranged so that the output shaft 24 has a constant axis intersection angle with the rack shaft (inclined to the side opposite to the manual steering section 14). The output shaft 24 is rotatably supported by a bearing 26, and a bevel gear 28 is fixed to the tip thereof.

【０００９】ボールねじ機構３０はラック軸１０の一部
から成り外周面にらせん状のボールねじ溝３２が形成さ
れたねじ軸３４と、多数のボール３６を介してねじ軸３
４に遊嵌され内周面にらせん状のボールねじ溝３８が形
成された鉄製のボールナット４０と、ねじ軸３４上を前
方に進んだボール３６を後方に戻すボール戻し管４２と
を含む。ハウジング１２の左端は開放しており、ここに
鉄製で円筒状のナットホルダ４４が螺合されている。ボ
ールナット４０は一端の玉軸受４６、４７によってナッ
トホルダ４４に対して回転可能に支承され、軸受４７か
ら突出した右端部には円筒部と円錐部とから成る傘歯車
５２が固定され、上記傘歯車２８と噛合している。The ball screw mechanism 30 comprises a part of the rack shaft 10 and a screw shaft 34 having a spiral ball screw groove 32 formed on the outer peripheral surface thereof, and a plurality of balls 36 to form the screw shaft 3 therebetween.
An iron ball nut 40, which is loosely fitted into the shaft 4 and has a spiral ball screw groove 38 formed on the inner peripheral surface thereof, and a ball return pipe 42 for returning the ball 36, which has moved forward on the screw shaft 34, to the rear. The left end of the housing 12 is open, and a nut holder 44 made of iron and having a cylindrical shape is screwed therein. The ball nut 40 is rotatably supported by a nut holder 44 by ball bearings 46 and 47 at one end, and a bevel gear 52 including a cylindrical portion and a conical portion is fixed to a right end portion protruding from the bearing 47. It meshes with the gear 28.

【００１０】ナットホルダ４４の外周面にはバックラッ
シュ調整ねじ５４が螺合され、ハウジング１２の端面に
当接している。また、ねじ軸３４の外周面とナットホル
ダ４４の左端の内周面との間には、予圧調整ねじ５６が
両者に螺合して配置されている。A backlash adjusting screw 54 is screwed onto the outer peripheral surface of the nut holder 44 and is in contact with the end surface of the housing 12. Further, between the outer peripheral surface of the screw shaft 34 and the inner peripheral surface of the left end of the nut holder 44, a preload adjusting screw 56 is arranged so as to be screwed with both.

【００１１】次に、この実施の形態の作用を説明する。
手動操舵部１４は、ステアリングホイールの回転操舵に
よりラック・ピニオン機構を介してラック軸１０を直進
させる公知のものである。一方、補助操舵部２０におけ
る補助操舵力の入力は以下の通り行われる。即ち、電動
モータ２２の回転力は一対の傘歯車２８及び５２を介し
てボールナット４０に伝達されてこれを回転させる。そ
の結果、多数のボール３６を介してねじ軸３４即ちラッ
ク軸１０が軸方向に移動して、前輪を転舵することとな
る。Next, the operation of this embodiment will be described.
The manual steering unit 14 is a known unit that moves the rack shaft 10 straight through a rack and pinion mechanism by rotating the steering wheel. On the other hand, the input of the auxiliary steering force in the auxiliary steering unit 20 is performed as follows. That is, the rotational force of the electric motor 22 is transmitted to the ball nut 40 via the pair of bevel gears 28 and 52 to rotate the ball nut 40. As a result, the screw shaft 34, that is, the rack shaft 10 moves in the axial direction through the large number of balls 36, and the front wheels are steered.

【００１２】前述したように、一般に、ボールナットを
材質（熱膨張係数）の異なるハウジングに収容すると、
周辺の温度が変化したとき両者の伸縮量が異なり、軸受
の予圧が過大になったり、反対に抜けたりする。しか
し、ここではハウジング１２はアルミニウム製でボール
ナット４０は鉄製で両者の材質は異なるが、ボールナッ
ト４０を直接ハウジング１２に収容するのではなく、ボ
ールナット４０と同じ金属材料から成るナットホルダ４
４を介してハウジング１２に収容した。その結果、温度
変化時におけるボールナット４０とナットホルダ４４と
の伸縮量は等しくなり、予圧調整ねじ５６でセットした
予圧が長期間にわたって維持されることとなる。０従っ
て、剛性が低下したり、異音が発生することが防止され
る。As described above, generally, when the ball nuts are housed in housings made of different materials (coefficients of thermal expansion),
When the ambient temperature changes, the amount of expansion and contraction of the two will be different, and the preload of the bearing will become excessive, or the bearing will slip out. However, here, although the housing 12 is made of aluminum and the ball nut 40 is made of iron and the materials thereof are different, the ball nut 40 is not directly housed in the housing 12, but the nut holder 4 made of the same metal material as the ball nut 40 is used.
It was accommodated in the housing 12 via the No. 4. As a result, the amount of expansion and contraction of the ball nut 40 and the nut holder 44 becomes equal when the temperature changes, and the preload set by the preload adjusting screw 56 is maintained for a long period of time. Therefore, it is possible to prevent the rigidity from being lowered and the abnormal noise from being generated.

【００１３】また、前述したように、一般に電動モータ
とラック軸とを軸交角をもって配置し、出力軸とボール
ナットとの間に一対の傘歯車を介装した場合には、両傘
歯車間にバックラッシュが発生する。しかし、ここでは
バックラッシュ調整ねじ５４を回転することよりこれを
容易に調整することができる。即ち、バックラッシュ調
整ねじ５４を回転してその位置を軸方向において変位さ
せると、傘歯車５２、軸受４６、４７及びボールナット
４０がハウジング１２に対して軸方向に移動される。こ
うして、傘歯車２８と５２との相対位置関係が変化して
バックラッシュが調整されるのである。Further, as described above, in general, when the electric motor and the rack shaft are arranged with an intersecting angle, and a pair of bevel gears is interposed between the output shaft and the ball nut, the bevel gears are interposed between the bevel gears. Backlash occurs. However, here, this can be easily adjusted by rotating the backlash adjusting screw 54. That is, when the backlash adjusting screw 54 is rotated to displace its position in the axial direction, the bevel gear 52, the bearings 46 and 47, and the ball nut 40 are moved in the axial direction with respect to the housing 12. In this way, the relative positional relationship between the bevel gears 28 and 52 changes, and the backlash is adjusted.

【００１４】なお、上述したのは本発明の一つの実施の
形態にすぎず、本発明はこれに限定されるものではな
く、その趣旨を損ねない範囲で適宜変更、改良が可能で
ある。例えば、第１の発明にとってはモータとボールナ
ットとの間の減速歯車は傘歯車以外の一般的なもので良
く、また第２の発明にとってはボールナットとナットホ
ルダとが同一の金属材料であることは必須ではない。The above is only one embodiment of the present invention, and the present invention is not limited to this, and various modifications and improvements can be made without departing from the spirit of the invention. For example, for the first invention, the reduction gear between the motor and the ball nut may be a general one other than a bevel gear, and for the second invention, the ball nut and the nut holder are made of the same metal material. That is not mandatory.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の一つの実施形態を示す正面図（一部破
断）である。FIG. 1 is a front view (partially cut away) showing an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１０：ラック軸 １２：ハウジング １４：手動操舵部 ２０：電動式補助
操舵部 ２２：電動モータ ３０：ボールねじ
機構 ４４：ナットホルダ ２８，５２：傘歯
車10: Rack shaft 12: Housing 14: Manual steering unit 20: Electric auxiliary steering unit 22: Electric motor 30: Ball screw mechanism 44: Nut holder 28, 52: Bevel gear

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 その両端において車両の転舵輪に連結さ
れて車両の左右方向に延びるラック軸と、該ラック軸を
軸方向に移動可能に収容するハウジングと、前記ラック
軸に手動操舵力を入力する手動操舵部と、前記ラック軸
に電動補助操舵力を入力する電動式補助操舵部と、を含
む電動パワーステアリング装置において、 前記電動式補助操舵部は、 前記ハウジングに取り付けられた電動モータと、 前記ラック軸の一部から成るねじ軸と、これに多数のボ
ールを介して装着されたボールナットとを含むボールね
じ機構と、 前記ボールナットと同じ金属材料から成って前記ハウジ
ングの内周面に装着され、一対の軸受によって前記ボー
ルナットを回転可能に支承するナットホルダと、 前記電動モータの出力軸と前記ボールナットとの間に介
装された減速歯車と、 から成り、前記一対の軸受に加わる予圧が所定の大きさ
に維持できることを特徴とする電動パワーステアリング
装置。1. A rack shaft, which is connected to steered wheels of a vehicle at both ends thereof and extends in the left-right direction of the vehicle, a housing for housing the rack shaft so as to be movable in the axial direction, and a manual steering force is input to the rack shaft. In an electric power steering apparatus including a manual steering unit that performs the electric steering operation and an electric auxiliary steering unit that inputs an electric auxiliary steering force to the rack shaft, the electric auxiliary steering unit includes an electric motor attached to the housing, A ball screw mechanism including a screw shaft formed of a part of the rack shaft and a ball nut mounted to the rack shaft through a large number of balls, and an inner peripheral surface of the housing made of the same metal material as the ball nut. A nut holder that is mounted and rotatably supports the ball nut with a pair of bearings, and is interposed between the output shaft of the electric motor and the ball nut. And a reduction gear consists preload applied to the pair of bearing an electric power steering apparatus characterized by capable of maintaining a predetermined size. 【請求項２】 その両端において車両の転舵輪に連結さ
れて車両の左右方向に延びるラック軸と、該ラック軸を
軸方向に移動可能に収容するハウジングと、前記ラック
軸に手動操舵力を入力する手動操舵部と、前記ラック軸
に電動補助操舵力を入力する電動式補助操舵部と、を含
む電動パワーステアリング装置において、 前記電動式補助操舵部は、 その出力軸が前記ラック軸と一定の軸交角をなすように
前記ハウジングに取り付けられた電動モータと、 前記ラック軸の一部から成るねじ軸と、これに多数のボ
ールを介して装着されたボールナットとを含むボールね
じ機構と、 前記ハウジングの内周面に装着され、一対の軸受によっ
て前記ボールナットを回転可能に支承するナットホルダ
と、 前記電動モータの出力軸と前記ボールナットとの間に介
装された一対の傘歯車と、 から成り、前記一対の傘歯車に生ずるバックラッシュを
容易に調整できることを特徴とする電動パワーステアリ
ング装置。2. A rack shaft that is connected to steered wheels of a vehicle at both ends thereof and extends in the left-right direction of the vehicle, a housing that accommodates the rack shaft so as to be movable in the axial direction, and a manual steering force is input to the rack shaft. In the electric power steering apparatus, the electric power steering device includes a manual steering unit that performs electric power steering, and an electric auxiliary steering unit that inputs an electric auxiliary steering force to the rack shaft. A ball screw mechanism including an electric motor attached to the housing so as to form an axial intersection angle, a screw shaft formed of a part of the rack shaft, and a ball nut mounted to the rack shaft through a large number of balls, A nut holder mounted on the inner peripheral surface of the housing and rotatably supporting the ball nut by a pair of bearings; an output shaft of the electric motor and the ball nut; A pair of the bevel gears, made, the electric power steering apparatus characterized by easily adjusting the backlash occurring in the pair of bevel gears interposed.
JP7285799A 1995-11-02 1995-11-02 Motor-driven power steering device Withdrawn JPH09123927A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7285799A JPH09123927A (en) 1995-11-02 1995-11-02 Motor-driven power steering device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7285799A JPH09123927A (en) 1995-11-02 1995-11-02 Motor-driven power steering device

Publications (1)

Publication Number Publication Date
JPH09123927A true JPH09123927A (en) 1997-05-13

Family

ID=17696236

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7285799A Withdrawn JPH09123927A (en) 1995-11-02 1995-11-02 Motor-driven power steering device

Country Status (1)

Country Link
JP (1) JPH09123927A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1225117A1 (en) * 2001-01-22 2002-07-24 Koyo Seiko Co., Ltd. An electric power steering system
WO2003006301A1 (en) * 2001-07-10 2003-01-23 Toyoda Koki Kabushiki Kaisha Electronic control power steering device
JP2003127879A (en) * 2001-10-22 2003-05-08 Toyoda Mach Works Ltd Electric power steering device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1225117A1 (en) * 2001-01-22 2002-07-24 Koyo Seiko Co., Ltd. An electric power steering system
US6629578B2 (en) 2001-01-22 2003-10-07 Koyo Seiko Co., Ltd. Electric power steering system
EP1384654A3 (en) * 2001-01-22 2004-03-24 Koyo Seiko Co., Ltd. An electric power steering system
EP1384653A3 (en) * 2001-01-22 2004-03-24 Koyo Seiko Co., Ltd. An electric power steering system
US6823962B2 (en) 2001-01-22 2004-11-30 Koyo Seiko Co., Ltd. Electric power steering system
US6918457B2 (en) 2001-01-22 2005-07-19 Koyo Seiko Co., Ltd. Electric power steering system
WO2003006301A1 (en) * 2001-07-10 2003-01-23 Toyoda Koki Kabushiki Kaisha Electronic control power steering device
US6973990B2 (en) 2001-07-10 2005-12-13 Toyoda Koki Kabushiki Kaisha Electronic control power steering device
JP2003127879A (en) * 2001-10-22 2003-05-08 Toyoda Mach Works Ltd Electric power steering device

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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: 20030107