JP2006182048A - Electric power steering device - Google Patents

Electric power steering device Download PDF

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Publication number
JP2006182048A
JP2006182048A JP2004374602A JP2004374602A JP2006182048A JP 2006182048 A JP2006182048 A JP 2006182048A JP 2004374602 A JP2004374602 A JP 2004374602A JP 2004374602 A JP2004374602 A JP 2004374602A JP 2006182048 A JP2006182048 A JP 2006182048A
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Japan
Prior art keywords
housing
shaft
electric power
electric motor
power steering
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JP2004374602A
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Japanese (ja)
Inventor
Tetsuya Murakami
哲也 村上
Akiro Osuga
章朗 大須賀
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Favess Co Ltd
JTEKT Corp
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Favess Co Ltd
JTEKT Corp
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Priority to JP2004374602A priority Critical patent/JP2006182048A/en
Publication of JP2006182048A publication Critical patent/JP2006182048A/en
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  • Power Steering Mechanism (AREA)
  • Gear Transmission (AREA)
  • Transmission Devices (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To joint a second housing to a first housing without attaching a flange. <P>SOLUTION: This device includes a rotating shaft 4 which moves in a longitudinal direction of the shaft in accordance with a steering operation, a driving gear 10 interlocked with an output shaft 5a of an electric motor 5, a rotating sleeve 12 disposed around the outside of a spiral groove 4b of the rotating shaft 4 and has a driven gear 11 engaged with the driving gear 10, a first housing 7 which supports the rotating sleeve 12 so as to be rotated freely, a second housing 8 which rotatably supports the driving gear 10 and to which the electric motor 5 is attached, a bolt 18 which joints the second housing 8 to the first housing 7, and a power conversion mechanism A which converts a rotating force of the rotating sleeve 12 into a moving force of the rotating shaft 4 in the longitudinal direction of the shaft to transmit it to the rotating shaft 4. The bolt 18 is disposed in the second housing 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は操舵補助力の発生源として用いられる電動モータの回転力を転舵軸に伝え、該転舵軸を軸長方向へ移動させて操舵補助するようにした電動パワーステアリング装置に関する。   The present invention relates to an electric power steering apparatus that transmits a rotational force of an electric motor used as a generation source of a steering assist force to a steered shaft and moves the steered shaft in the axial length direction to assist steering.

車両用の電動パワーステアリング装置は、螺旋溝を有し、舵取操作に応じて軸長方向へ移動する転舵軸と、出力軸が前記転舵軸の軸線と交差するように配置された操舵補助用の電動モータと、前記出力軸に駆動軸を介して連動連結される駆動歯車と、前記螺旋溝の外周りに配置され、前記駆動歯車に噛合する従動歯車を有する回転筒と、該回転筒を回転自在に収容支持する円筒形の第１ハウジングと、前記駆動歯車を回転自在に支持し、前記電動モータが取着される円筒形の第２ハウジングと、該第２ハウジングを前記第１ハウジングに結合するボルトと、前記回転筒の回転力を前記転舵軸の軸長方向への移動力に変換して前記転舵軸に伝える動力変換機構とを備えている（例えば、特許文献１。）。   An electric power steering apparatus for a vehicle has a spiral groove and a steering shaft that moves in the axial length direction in response to a steering operation, and a steering wheel that is arranged so that an output shaft intersects the axis of the steering shaft. An auxiliary electric motor; a drive gear linked to the output shaft via a drive shaft; a rotary cylinder having a driven gear arranged around the spiral groove and meshing with the drive gear; and the rotation A cylindrical first housing that rotatably accommodates and supports the cylinder, a cylindrical second housing that rotatably supports the drive gear and to which the electric motor is attached, and the second housing that is the first housing. A bolt coupled to the housing, and a power conversion mechanism that converts the rotational force of the rotating cylinder into a moving force in the axial length direction of the steered shaft and transmits it to the steered shaft (for example, Patent Document 1). .)

第１ハウジングの一側には転舵軸の軸線と交差する方向へ貫通する支持孔を有する台座部が突設されており、この台座部に第１ねじ孔を有する二つの第１フランジが突設されている。   On one side of the first housing, a pedestal portion having a support hole penetrating in a direction intersecting with the axis of the steered shaft is projected, and two first flanges having a first screw hole project on the pedestal portion. It is installed.

第２ハウジングは前記駆動歯車及び駆動軸を収容支持する小筒部と、該小筒部に連なり、前記電動モータのモータケースが取着される大筒部とを有しており、該大筒部の長手方向一側に、前記第１フランジのねじ孔に対応する第１貫通孔が設けられた二つの第２フランジが突設されており、大筒部の長手方向他側に、第２ねじ孔を有する二つの第３フランジが突設されている。   The second housing has a small tube portion that accommodates and supports the drive gear and the drive shaft, and a large tube portion that is connected to the small tube portion and to which a motor case of the electric motor is attached. Two second flanges provided with first through holes corresponding to the screw holes of the first flange are protruded on one side in the longitudinal direction, and the second screw holes are provided on the other side in the longitudinal direction of the large tube portion. Two third flanges having protrusions are provided.

また、前記電動モータは回転子及び固定子を収容支持するモータケースに、前記第２ねじ孔に対応する第２貫通孔が設けられた二つの第４フランジが突設されている。
そして、第１貫通孔に挿通するボルトを第１ねじ孔に緊締することにより第２ハウジングが第１ハウジングに結合され、第２貫通孔に挿通するボルトを第２ねじ孔に緊締することによりモータケースが第２ハウジングに結合される。
特開２００４−１７５２３９号公報 In the electric motor, two fourth flanges provided with second through holes corresponding to the second screw holes project from a motor case that accommodates and supports the rotor and the stator.
The second housing is coupled to the first housing by tightening a bolt inserted into the first through hole into the first screw hole, and the motor is tightened into the second screw hole by tightening the bolt inserted into the second through hole. A case is coupled to the second housing.
JP 2004-175239 A

ところが、以上のように構成された電動パワーステアリング装置にあっては、第２ハウジングを第１ハウジングに結合するための第１フランジ及び第２フランジが外部に突設されており、さらに、電動モータを第２ハウジングに取付装着するための第３フランジ及び第４フランジが外部に突設されており、しかも、第１フランジ及び第２フランジと、第３フランジ及び第４フランジとは出力軸の軸線方向に対向しない位置、換言すれば出力軸の周方向へ互いに変位した位置に配設され、第３フランジに邪魔されることなく第２ハウジングを第１ハウジングに結合することができるように構成する必要があるため、第２のハウジングの外部に突設されるフランジの個数が多くなり、電動パワーステアリング装置全体が大形となり、また、車両への搭載性が損なわれることになり、改善策が要望されていた。   However, in the electric power steering apparatus configured as described above, the first flange and the second flange for coupling the second housing to the first housing are projected outward, and further, the electric motor A third flange and a fourth flange for mounting and mounting the second housing on the second housing protrude from the outside, and the first flange and the second flange, and the third flange and the fourth flange are axes of the output shaft. The second housing is disposed at a position that is not opposed to the direction, in other words, at a position displaced from each other in the circumferential direction of the output shaft, and can be coupled to the first housing without being obstructed by the third flange. As a result, the number of flanges projecting outside the second housing increases, and the entire electric power steering apparatus becomes large. Will be installed is impaired, improvement has been desired.

本発明は斯かる事情に鑑みてなされたものであり、フランジを設けることなく第２ハウジングを第１ハウジングに結合することが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する。   The present invention has been made in view of such circumstances, and an object thereof is to provide an electric power steering apparatus capable of coupling the second housing to the first housing without providing a flange.

第１発明に係る電動パワーステアリング装置は、螺旋溝を有し、舵取操作に応じて軸長方向へ移動する転舵軸と、電動モータの出力軸に連動連結される駆動歯車と、前記螺旋溝の外周りに配置され、前記駆動歯車に噛合する従動歯車を有する回転筒と、該回転筒を回転自在に支持する第１ハウジングと、前記駆動歯車を回転自在に支持し、前記電動モータが取着される第２ハウジングと、該第２ハウジングを前記第１ハウジングに結合する結合部材と、前記回転筒の回転力を前記転舵軸の軸長方向への移動力に変換して前記転舵軸に伝える動力変換機構とを備えた電動パワーステアリング装置において、前記結合部材は前記第２ハウジング内に配置されていることを特徴とする。   An electric power steering device according to a first aspect of the present invention includes a steered shaft that has a spiral groove and moves in the axial length direction in response to a steering operation, a drive gear that is interlocked with an output shaft of an electric motor, and the spiral A rotating cylinder having a driven gear disposed around the groove and meshing with the driving gear; a first housing that rotatably supports the rotating cylinder; and the electric gear that rotatably supports the driving gear. A second housing to be attached, a coupling member that couples the second housing to the first housing, and a rotational force of the rotating cylinder is converted into a moving force in the axial length direction of the steered shaft to convert the rolling shaft. In the electric power steering apparatus including a power conversion mechanism for transmitting to the rudder shaft, the coupling member is disposed in the second housing.

第２発明に係る電動パワーステアリング装置は、前記第２ハウジングは前記駆動歯車を収容支持する小筒部と、前記電動モータが取着される大筒部と、小筒部及び大筒部を連結し、複数の貫通孔が設けられた連結部とを有しており、前記第１ハウジングは前記貫通孔に対応するねじ孔を有しており、該ねじ孔に前記結合部材が螺着されていることを特徴とする。   In the electric power steering apparatus according to a second aspect of the present invention, the second housing connects the small tube portion that accommodates and supports the drive gear, the large tube portion to which the electric motor is attached, the small tube portion and the large tube portion, A connecting portion provided with a plurality of through holes, the first housing has a screw hole corresponding to the through hole, and the coupling member is screwed into the screw hole. It is characterized by.

第３発明に係る電動パワーステアリング装置は、前記第１ハウジングは前記小筒部が遊嵌入される嵌入孔を有することを特徴とする。   The electric power steering apparatus according to a third aspect of the present invention is characterized in that the first housing has a fitting hole into which the small tube portion is loosely fitted.

第１発明によれば、第２ハウジングを第１ハウジングに結合する結合部材が第２ハウジング内に配置されているため、第２ハウジングを第１ハウジングに結合するためのフランジをなくすることができる。従って、第２ハウジングの周りを小形に、ひいては電動パワーステアリング装置全体を小形にでき、車両への搭載性を向上できる。   According to the first invention, since the coupling member that couples the second housing to the first housing is disposed in the second housing, the flange for coupling the second housing to the first housing can be eliminated. . Therefore, the periphery of the second housing can be reduced in size, and thus the entire electric power steering apparatus can be reduced in size, and the mountability on the vehicle can be improved.

第２発明によれば、第２ハウジングの小筒部及び大筒部を連結する連結部に設けられた貫通孔に連結部材を挿入し、該連結部材を第１ハウジングのねじ孔に螺着することにより第２ハウジングを結合することができる。従って、連結部材としてボルトを用いることができ、該ボルトを緊締操作することにより第２ハウジングを簡易に結合することができる。   According to the second invention, the connecting member is inserted into the through hole provided in the connecting portion that connects the small tube portion and the large tube portion of the second housing, and the connecting member is screwed into the screw hole of the first housing. Thus, the second housing can be coupled. Accordingly, a bolt can be used as the connecting member, and the second housing can be easily coupled by tightening the bolt.

第３発明によれば、第２ハウジングの小筒部が第１ハウジングの嵌入孔に遊嵌入され、小筒部による駆動歯車の支持剛性を低くしてあるため、駆動歯車及び従動歯車の噛合部に負荷が加わったとき、駆動歯車及び従動歯車の歯と前記小筒部とが撓むことになり、適正な歯当たりを得ることができ、噛合摺動異音の発生を改善できる。   According to the third invention, the small cylinder portion of the second housing is loosely inserted into the insertion hole of the first housing, and the support rigidity of the drive gear by the small cylinder portion is lowered, so that the meshing portion of the drive gear and the driven gear When a load is applied, the teeth of the drive gear and the driven gear and the small cylinder portion are bent, and an appropriate tooth contact can be obtained, and the occurrence of abnormal sliding noise can be improved.

以下本発明をその実施の形態を示す図面に基づいて詳述する。
実施の形態１
図１は本発明に係る電動パワーステアリング装置の全体の構成を示す模式図、図２及び図３は要部の構成を示す拡大断面図、図４は電動モータ側の側面図である。 Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
Embodiment 1
FIG. 1 is a schematic diagram showing the overall configuration of an electric power steering apparatus according to the present invention, FIGS. 2 and 3 are enlarged sectional views showing the configuration of essential parts, and FIG. 4 is a side view of the electric motor side.

図１〜図４に示した電動パワーステアリング装置は、一端部がユニバーサルジョイント１及び操舵軸２を介してステアリングホイールに繋がり、他端部にピニオン３ａを有する伝動軸３と、ピニオン３ａに噛合するラック歯４ａ及び該ラック歯４ａとその軸長方向へ離隔した位置に螺旋溝４ｂを有し、軸長方向への移動を可能とした転舵軸４と、出力軸５ａが転舵軸４の軸線と交差するように配置された操舵補助用の電動モータ５と、出力軸５ａに駆動軸６を介して連動連結される駆動歯車１０と、螺旋溝４ｂの外周りに配置され、駆動歯車１０に噛合する従動歯車１１を有する回転筒１２と、該回転筒１２を回転自在に収容支持する円筒形の第１ハウジング７と、駆動軸６及び駆動歯車１０を回転自在に支持し、電動モータ５が取着される円筒形の第２ハウジング８と、螺旋溝４ｂに係合する係合体としてのボール１３を有し、回転筒１２の回転力を転舵軸４の軸長方向への移動力に変換して転舵軸４に伝える動力変換機構Ａとを備える。   The electric power steering apparatus shown in FIGS. 1 to 4 has one end connected to a steering wheel via a universal joint 1 and a steering shaft 2 and meshes with a transmission shaft 3 having a pinion 3a at the other end and the pinion 3a. The rack teeth 4a and the rack teeth 4a and the spiral grooves 4b at positions separated from the rack teeth 4a in the axial length direction, and the output shaft 5a of the steered shaft 4 can be moved in the axial length direction. A steering assisting electric motor 5 disposed so as to intersect the axis, a drive gear 10 linked to the output shaft 5a via the drive shaft 6, and a periphery of the spiral groove 4b. A rotating cylinder 12 having a driven gear 11 that meshes with the rotating cylinder 12, a cylindrical first housing 7 that rotatably accommodates and supports the rotating cylinder 12, a driving shaft 6 and a driving gear 10 that rotatably support the electric motor 5 Is attached It has a cylindrical second housing 8 and a ball 13 as an engaging body that engages with the spiral groove 4b. The rotational force of the rotating cylinder 12 is converted into a moving force in the axial length direction of the steered shaft 4, and the rolling is performed. And a power conversion mechanism A for transmitting to the rudder shaft 4.

この動力変換機構Ａは、回転筒１２の内側に螺旋溝４ｂに対応して設けられる雌ねじ１２ａと、該雌ねじ１２ａ及び螺旋溝４ｂに係合する複数のボール１３と、回転筒１２の雌ねじ１２ａに臨む位置で径方向に貫通する二つの循環孔（図示せず）及び該循環孔に連通し、二つの循環孔間で複数のボール１３を循環させるためのサーキュレータ１４とを有しており、該サーキュレータ１４が回転筒１２の外周部にホルダ１５により取付けられている。   The power conversion mechanism A includes a female screw 12a provided inside the rotary cylinder 12 corresponding to the spiral groove 4b, a plurality of balls 13 engaged with the female screw 12a and the spiral groove 4b, and a female screw 12a of the rotary cylinder 12. Two circulation holes (not shown) penetrating in a radial direction at a facing position, and a circulator 14 for circulating a plurality of balls 13 between the two circulation holes. A circulator 14 is attached to the outer periphery of the rotating cylinder 12 by a holder 15.

第１ハウジング７は、第２ハウジング８が結合され、転舵軸４のラック歯４ａ側を支持している第１の軸支部７ａを有する第１筒体７１と、該第１筒体７１にボルト等の連結手段により連結され、転舵軸４の螺旋溝４ｂ側を支持している第２の軸支部７ｂを有する第２筒体７２とを備える。   The first housing 7 is coupled to the second housing 8, and includes a first cylinder 71 having a first shaft support portion 7 a that supports the rack tooth 4 a side of the steered shaft 4, and the first cylinder 71. And a second cylinder 72 having a second shaft support portion 7b that is connected by a connecting means such as a bolt and supports the spiral groove 4b side of the steered shaft 4.

第１筒体７１の第２筒体７２との連結側は、回転筒１２を収容支持する収容部７ｄと、転舵軸４の軸線と交差する方向へ貫通する支持孔７ｄを有する台座部７ｅとを有しており、第１筒体７１の非連結側は、第１の軸支部７ａと、車体に取着される第１の取着部７ｆとを有する。収容部７ｃの長手方向両側には回転筒１２の両端部を支持する転がり軸受１６，２６が内嵌されており、台座部７ｅの周方向二箇所には後記する第１の貫通孔８ｄに対応する二つの第１のねじ孔７ｇが設けられている。   The connecting side of the first cylinder 71 with the second cylinder 72 includes a housing part 7d that houses and supports the rotating cylinder 12 and a support part 7e that has a support hole 7d that penetrates in the direction intersecting the axis of the turning shaft 4. The non-connecting side of the first cylinder 71 has a first shaft support portion 7a and a first attachment portion 7f attached to the vehicle body. Rolling bearings 16 and 26 that support both end portions of the rotary cylinder 12 are fitted on both sides in the longitudinal direction of the accommodating portion 7c, and two circumferential positions of the pedestal portion 7e correspond to first through holes 8d described later. Two first screw holes 7g are provided.

第２筒体７２は比較的短い長さに形成されており、内側に第２の軸支部７ｂとしてのすべり軸受が嵌合固定されており、外側に車体に取着される第２の取着部７ｈが設けられている。   The second cylindrical body 72 is formed to have a relatively short length, and a sliding bearing as a second shaft support portion 7b is fitted and fixed on the inner side. The second mounting is attached to the vehicle body on the outer side. A portion 7h is provided.

第２ハウジング８は支持孔７ｄに嵌入支持され、駆動軸６及び傘歯車からなる駆動歯車１０を転がり軸受１７，１７を介して収容支持する小筒部８ａと、電動モータ５が取着される大筒部８ｂと、小筒部８ａ及び大筒部８ｂを連結する円板状の連結部８ｃとを有しており、該連結部８ｃの周方向二箇所に、第１のねじ孔７ｇに対応する第１の貫通孔８ｄが設けられており、該貫通孔８ｄに結合部材としてのボルト１８が挿入され、該ボルト１８が第１のねじ孔７ｇに螺着されることにより第２ハウジング８が結合されている。また、大筒部８ｂの小筒部８ａと反対側の周方向二箇所には、第２のねじ孔８ｅを有する二つの第１フランジ８ｆが突設されている。   The second housing 8 is fitted and supported in the support hole 7d, and the small cylinder portion 8a for accommodating and supporting the drive gear 10 composed of the drive shaft 6 and the bevel gear via the rolling bearings 17 and 17 and the electric motor 5 are attached. It has a large tube portion 8b and a disk-shaped connecting portion 8c that connects the small tube portion 8a and the large tube portion 8b, and corresponds to the first screw hole 7g at two locations in the circumferential direction of the connecting portion 8c. A first through hole 8d is provided, and a bolt 18 as a coupling member is inserted into the through hole 8d, and the second housing 8 is coupled by screwing the bolt 18 into the first screw hole 7g. Has been. In addition, two first flanges 8f having second screw holes 8e protrude from two locations in the circumferential direction on the opposite side to the small tube portion 8a of the large tube portion 8b.

電動モータ５はモータケース５１を有しており、該モータケース５１の周方向二箇所に、第２のねじ孔８ｅに対応する第２の貫通孔５ｂが設けられた二つの第２のフランジ５ｃが突設されており、第２の貫通孔５ｂに連結部材としてのボルト１９が挿入され、該ボルト１９が第２のねじ孔８ｅに螺着されることによりモータケース５３、ひいては電動モータ５が第２ハウジング８に結合されている。   The electric motor 5 has a motor case 51, and two second flanges 5c provided with second through holes 5b corresponding to the second screw holes 8e at two circumferential directions of the motor case 51. Is protruded, and a bolt 19 as a connecting member is inserted into the second through-hole 5b, and the bolt 19 is screwed into the second screw hole 8e, whereby the motor case 53 and thus the electric motor 5 are Coupled to the second housing 8.

駆動歯車１０は駆動軸６と一体に形成されている。また、従動歯車１１は、外周部にはす歯を有する合成樹脂製の環状歯体１１ａと、該環状歯体１１ａに内嵌された金属製の環状芯体１１ｂとを備えており、該環状芯体１１ｂの外周部に環状歯体１１ａとの相対回転を禁止する回止凸部が設けられている。   The drive gear 10 is formed integrally with the drive shaft 6. The driven gear 11 includes an annular tooth body 11a made of a synthetic resin having teeth on the outer peripheral portion, and a metal annular core body 11b fitted into the annular tooth body 11a. A non-rotating convex portion that prohibits relative rotation with the annular tooth body 11a is provided on the outer peripheral portion of the core body 11b.

以上のように構成された電動パワーステアリング装置において、第２ハウジング８を第１ハウジング７に結合する場合、小筒部８ａに転がり軸受１７，１７を介して駆動軸６及び駆動歯車１０が支持された第２ハウジング８の小筒部８ａを支持孔７ｄに嵌入し、第１の貫通孔８ｄに挿入するボルト１８を第１のねじ孔７ｇに螺着することにより第２ハウジング８を第１ハウジング７に結合することができる。また、電動モータ５を第２ハウジング８に取着する場合、第２の貫通孔５ｂに挿入するボルト１９を第２のねじ孔８ｅに螺着することによりモータケース５３を第２ハウジング８に取着することができる。以上の構成にあっては、第１の貫通孔８ｄは第２ハウジング８内にあり、第２ハウジング８を第１ハウジング７に結合する箇所には外部に突出するフランジがなく、電動モータ５を取着する箇所にだけ外部に突出する第１及び第２のフランジ８ｆ，５ｃがあるため、第２ハウジング８の周りを小形に、ひいては電動パワーステアリング装置全体を小形にでき、車両への搭載性を向上できる。   In the electric power steering apparatus configured as described above, when the second housing 8 is coupled to the first housing 7, the drive shaft 6 and the drive gear 10 are supported by the small tube portion 8a via the rolling bearings 17 and 17. The small housing portion 8a of the second housing 8 is fitted into the support hole 7d, and a bolt 18 to be inserted into the first through hole 8d is screwed into the first screw hole 7g to thereby attach the second housing 8 to the first housing. 7 can be combined. When the electric motor 5 is attached to the second housing 8, the motor case 53 is attached to the second housing 8 by screwing the bolt 19 inserted into the second through hole 5b into the second screw hole 8e. Can be worn. In the above configuration, the first through hole 8d is in the second housing 8, and there is no flange projecting outside at the position where the second housing 8 is coupled to the first housing 7, and the electric motor 5 is installed. Since the first and second flanges 8f and 5c project outside only at the attachment location, the periphery of the second housing 8 can be made small, and the entire electric power steering device can be made small, so that it can be mounted on a vehicle. Can be improved.

実施の形態２
図５は実施の形態２の要部の構成を示す拡大断面図である。
この電動パワーステアリング装置は、嵌入孔としての支持孔７ｄに嵌入支持される第２ハウジング８の小筒部８ａを支持孔７ｄより小径とし、支持孔７ｄ及び小筒部８ａの周面間に隙間を設け、小筒部８ａを径方向へ撓み可能に構成したものである。 Embodiment 2
FIG. 5 is an enlarged cross-sectional view showing a configuration of a main part of the second embodiment.
In this electric power steering apparatus, the small cylindrical portion 8a of the second housing 8 fitted and supported in the support hole 7d as the fitting hole has a smaller diameter than the support hole 7d, and a gap is formed between the peripheral surfaces of the support hole 7d and the small cylindrical portion 8a. And the small tube portion 8a is configured to be able to bend in the radial direction.

出力軸５ａが転舵軸４の軸線と交差するように第１ハウジング７の外部に電動モータ５が配置された電動パワーステアリング装置は、駆動歯車１０及び従動歯車１１の噛合部に加わる負荷により駆動歯車１０、従動歯車１１の歯及び駆動軸６が撓み、噛合部の歯当りが悪くなり、噛合摺動異音が発生することになるが、実施の形態２にあっては、前記噛合部に加わる負荷により駆動歯車１０及び従動歯車１１の歯と、小筒部８ａとが撓むため、噛合部の適正な歯当りを維持することができ、噛合摺動異音の発生を改善できる。
その他の構成及び作用は実施の形態１と同様であるため、同様の部品については同じ符号を付し、その詳細な説明及び作用効果の説明を省略する。 The electric power steering apparatus in which the electric motor 5 is arranged outside the first housing 7 so that the output shaft 5a intersects the axis of the steered shaft 4 is driven by a load applied to the meshing portion of the drive gear 10 and the driven gear 11. The teeth of the gear 10 and the driven gear 11 and the drive shaft 6 are bent, the tooth contact of the meshing portion is deteriorated, and an abnormal sliding noise is generated. In the second embodiment, the meshing portion Since the teeth of the drive gear 10 and the driven gear 11 and the small tube portion 8a are bent by the applied load, it is possible to maintain an appropriate tooth contact of the meshing portion and improve the occurrence of meshing sliding noise.
Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof and description of operations and effects are omitted.

尚、以上説明した実施の形態では、出力軸５ａの回転力を軸長方向への移動力に変換する動力変換機構Ａとして、ボールねじ機構を用いたが、その他、螺旋溝４ｂの一部に係合する凸条環部をその内周部に有する内環部材と、該内環部材の外周部を複数のボールを介して回転自在に保持した外環部材とを備えた複数の伝動環が転舵軸４の軸心に対して偏倚して回転筒１２に内嵌保持された機構を用いてもよい。   In the embodiment described above, the ball screw mechanism is used as the power conversion mechanism A that converts the rotational force of the output shaft 5a into the moving force in the axial length direction. A plurality of power transmission rings each including an inner ring member having an engaging annular ring portion on its inner peripheral portion and an outer ring member that rotatably holds the outer peripheral portion of the inner ring member via a plurality of balls. A mechanism that is biased with respect to the axis of the steered shaft 4 and is held in the rotary cylinder 12 may be used.

また、本発明に係る電動パワーステアリング装置は、転舵軸４の軸線と交差する位置に電動モータ５が配置された構成である他、転舵軸４と平行的に電動モータ５が配置された構成であってもよい。この場合、小歯車７及び大歯車８は傘歯車である他、平歯車であってもよい。   In addition, the electric power steering apparatus according to the present invention has a configuration in which the electric motor 5 is disposed at a position intersecting the axis of the steered shaft 4, and the electric motor 5 is disposed in parallel with the steered shaft 4. It may be a configuration. In this case, the small gear 7 and the large gear 8 may be spur gears as well as bevel gears.

本発明に係る電動パワーステアリング装置の全体の構成を示す模式図である。1 is a schematic diagram showing an overall configuration of an electric power steering apparatus according to the present invention. 本発明に係る電動パワーステアリング装置の要部の構成を示す拡大断面図である。It is an expanded sectional view showing the composition of the important section of the electric power steering device concerning the present invention. 本発明に係る電動パワーステアリング装置の要部の構成を示す拡大断面図である。It is an expanded sectional view showing the composition of the important section of the electric power steering device concerning the present invention. 本発明に係る電動パワーステアリング装置の電動モータ側の側面図である。It is a side view by the side of the electric motor of the electric power steering apparatus which concerns on this invention. 本発明に係る電動パワーステアリング装置の実施の形態２の要部の構成を示す拡大断面図である。It is an expanded sectional view which shows the structure of the principal part of Embodiment 2 of the electric power steering apparatus which concerns on this invention.

符号の説明Explanation of symbols

４ 転舵軸
４ｂ 螺旋溝
５ 電動モータ
５ａ 出力軸
７ 第１ハウジング
７ｄ 支持孔（嵌入孔）
７ｇ 第１のねじ孔（ねじ孔）
８ 第２ハウジング
８ａ 小筒部
８ｂ 大筒部
８ｃ 連結部
８ｄ 第１の貫通孔（貫通孔）
１０ 駆動歯車
１１ 従動歯車
１２ 回転筒
１８ ボルト（結合部材）
Ａ 動力変換機構 4 Steering shaft 4b Spiral groove 5 Electric motor 5a Output shaft 7 First housing 7d Support hole (insertion hole)
7g First screw hole (screw hole)
8 Second housing 8a Small tube portion 8b Large tube portion 8c Connection portion 8d First through hole (through hole)
DESCRIPTION OF SYMBOLS 10 Drive gear 11 Driven gear 12 Rotating cylinder 18 Bolt (coupling member)
A Power conversion mechanism

Claims (3)

螺旋溝を有し、舵取操作に応じて軸長方向へ移動する転舵軸と、電動モータの出力軸に連動連結される駆動歯車と、前記螺旋溝の外周りに配置され、前記駆動歯車に噛合する従動歯車を有する回転筒と、該回転筒を回転自在に支持する第１ハウジングと、前記駆動歯車を回転自在に支持し、前記電動モータが取着される第２ハウジングと、該第２ハウジングを前記第１ハウジングに結合する結合部材と、前記回転筒の回転力を前記転舵軸の軸長方向への移動力に変換して前記転舵軸に伝える動力変換機構とを備えた電動パワーステアリング装置において、前記結合部材は前記第２ハウジング内に配置されていることを特徴とする電動パワーステアリング装置。   A steered shaft that has a spiral groove and moves in the axial length direction in response to a steering operation, a drive gear that is interlocked and connected to the output shaft of the electric motor, and the drive gear that is disposed around the outer periphery of the spiral groove. A rotating cylinder having a driven gear meshing with the rotating cylinder; a first housing that rotatably supports the rotating cylinder; a second housing that rotatably supports the driving gear and to which the electric motor is attached; A coupling member that couples the two housings to the first housing, and a power conversion mechanism that converts the rotational force of the rotating cylinder into a moving force in the axial length direction of the steered shaft and transmits it to the steered shaft. In the electric power steering apparatus, the coupling member is disposed in the second housing. 前記第２ハウジングは前記駆動歯車を収容支持する小筒部と、前記電動モータが取着される大筒部と、小筒部及び大筒部を連結し、複数の貫通孔が設けられた連結部とを有しており、前記第１ハウジングは前記貫通孔に対応するねじ孔を有しており、該ねじ孔に前記結合部材が螺着されている請求項１記載の電動パワーステアリング装置。   The second housing includes a small cylindrical portion that accommodates and supports the drive gear, a large cylindrical portion to which the electric motor is attached, a small cylindrical portion and a large cylindrical portion, and a connecting portion provided with a plurality of through holes. The electric power steering apparatus according to claim 1, wherein the first housing has a screw hole corresponding to the through hole, and the coupling member is screwed into the screw hole. 前記第１ハウジングは前記小筒部が遊嵌入される嵌入孔を有する請求項２記載の電動パワーステアリング装置。
The electric power steering apparatus according to claim 2, wherein the first housing has a fitting hole into which the small tube portion is loosely fitted.
JP2004374602A 2004-12-24 2004-12-24 Electric power steering device Pending JP2006182048A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004374602A JP2006182048A (en) 2004-12-24 2004-12-24 Electric power steering device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004374602A JP2006182048A (en) 2004-12-24 2004-12-24 Electric power steering device

Publications (1)

Publication Number Publication Date
JP2006182048A true JP2006182048A (en) 2006-07-13

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ID=36735484

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004374602A Pending JP2006182048A (en) 2004-12-24 2004-12-24 Electric power steering device

Country Status (1)

Country Link
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004001679A (en) * 2001-12-03 2004-01-08 Nsk Ltd Electric power steering device
JP2004122858A (en) * 2002-09-30 2004-04-22 Toyoda Mach Works Ltd Electric power steering device
JP2004175239A (en) * 2002-11-27 2004-06-24 Koyo Seiko Co Ltd Transmission device and electric power steering device equipped therewith
JP2004314854A (en) * 2003-04-17 2004-11-11 Koyo Seiko Co Ltd Steering device for vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004001679A (en) * 2001-12-03 2004-01-08 Nsk Ltd Electric power steering device
JP2004122858A (en) * 2002-09-30 2004-04-22 Toyoda Mach Works Ltd Electric power steering device
JP2004175239A (en) * 2002-11-27 2004-06-24 Koyo Seiko Co Ltd Transmission device and electric power steering device equipped therewith
JP2004314854A (en) * 2003-04-17 2004-11-11 Koyo Seiko Co Ltd Steering device for vehicle

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