JP4214752B2 - Steering device - Google Patents

Steering device Download PDF

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Publication number
JP4214752B2
JP4214752B2 JP2002294088A JP2002294088A JP4214752B2 JP 4214752 B2 JP4214752 B2 JP 4214752B2 JP 2002294088 A JP2002294088 A JP 2002294088A JP 2002294088 A JP2002294088 A JP 2002294088A JP 4214752 B2 JP4214752 B2 JP 4214752B2
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JP
Japan
Prior art keywords
guide body
rack shaft
support hole
guide
movement
Prior art date
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Expired - Fee Related
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JP2002294088A
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Japanese (ja)
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JP2004123063A (en
Inventor
圭司 岸本
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JTEKT Corp
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JTEKT Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、自動車用の舵取装置の一形式として広く普及しているラックピニオン式の舵取装置に関する。
【0002】
【従来の技術】
ラックピニオン式の舵取装置は、その両端が左右の操向輪に連結され舵取手段の操作に応じて軸長方向への移動が可能なラック軸と、該ラック軸のラック歯に噛合するピニオンと、該ピニオン及び前記ラック軸を支持するハウジングとを備え、舵取り操作力をピニオン及びラック歯を介してラック軸に伝動し、該ラック軸を軸長方向へ移動させて、左右の操向輪を操向する構成となっている。
【0003】
このようなラックピニオン式の舵取装置においては、ピニオン及びラック歯の噛合部のバックラッシュ量を少なくするとともに、ラック軸の移動を円滑に行わせるべくラック軸のラック歯と反対側位置に、前記ラック軸の移動を案内する案内溝を有する円柱形の案内体と、該案内体を摺動自在に支持する円形周面の支持孔を有する支持体とが設けられており、前記案内溝がラック軸のラック歯と反対側面と接触し、該ラック軸の移動を案内するように構成されている(例えば、特許文献1)。
【0004】
【特許文献1】
実開昭58−19873号公報
【0005】
【発明が解決しようとする課題】
ところで、前記案内体と支持孔との間には案内体を支持孔内で摺動させるための隙間が設けられているが、この隙間を大きくした際にはラック軸から案内溝に加わる力によって案内体が支持孔内で傾斜し、案内体の両端部が支持孔に当接して音鳴りするため、基本的には前記隙間を小さくするようにしてある。
【0006】
ところが、前記隙間を小さくした際には案内体の径方向への動き量が非常に少なくなるため、案内溝がラック軸と接触している状態でピニオンから伝動される回転力によりラック軸が軸長方向へ移動する移動初期の際に、案内溝及びラック軸の間の摩擦抵抗に打ち勝ってラック軸が案内体に対して軸長方向へ移動することになり、ラック軸の移動負荷、ひいてはラック軸のラック歯に噛合するピニオンの回転トルクが大きくなり、舵取操作性の低下を来すことになる。
【0007】
本発明は斯かる事情に鑑みてなされたものであり、案内体が支持孔内で傾斜して音鳴りすることを抑制することができ、しかも、ラック軸が軸長方向へ移動する移動初期の移動負荷を低減することができる舵取装置を提供することを目的とする。
【0008】
【課題を解決するための手段】
第1発明に係る舵取装置は、舵取手段にピニオンを介して繋がり、舵取手段の操作に応じて軸長方向への移動が可能なラック軸と、該ラック軸の移動を案内する案内溝を有する案内体と、該案内体を支持する支持孔を有する支持体とを備えた舵取装置において、前記案内体及び前記支持孔の一方は前記ラック軸の軸長方向に沿った縦断面の形状が円形の周面であり、案内体及び支持孔の他方は前記縦断面の形状が略楕円形の周面であり、且つ前記案内体及び支持孔の周面で前記ラック軸の軸長方向と直交する方向の寸法を、案内体よりも支持孔が大となり、前記ラック軸の移動初期に該ラック軸とともに前記案内体を支持孔内で前記ラック軸の軸長方向へ動かせるとともに、案内体の動き量が最大となる位置で案内体の周面が支持孔の周面に接触して案内体の動きを規制するようにしてあることを特徴とする。
【0009】
第1発明にあっては、案内体を支持孔内でラック軸の軸長方向へ動かせることができるようにしてあるため、ラック軸が軸長方向へ移動する移動初期には、案内溝及びラック軸の間の摩擦抵抗により案内体がラック軸と一体化してラック軸の軸長方向へ動き、この動きの後で前記円形の周面及び非円形の周面同士が接触することにより、案内体の動きが規制され、この案内体に対してラック軸が軸長方向へ移動することになる。このようにラック軸が軸長方向へ移動する移動初期には、案内体がラック軸と一体化して動くため、ラック軸の移動負荷を小さくすることができる。しかも、案内体及び支持孔の周面でラック軸の軸長方向と直交する方向の案内体及び支持孔の間の隙間を小さくすることができるため、ラック軸から案内溝に加わる力によって案内体が支持孔内で傾斜することを抑制でき、この案内体の傾斜による音鳴りを抑制することができる。また、案内体及び支持孔の寸法を変えるだけの簡易な構成にでき、部品点数を増加したり、組立て性を悪くしたりすることなく構成することができる。
【0010】
第2発明に係る舵取装置は、前記ラック軸の前記案内溝により案内される部位は、前記案内溝に係合する非円形係合部を設けてあることを特徴とする。
第3発明に係る舵取装置は、前記案内体の周面は環状溝を有し、該環状溝に、前記支持孔の周面に接触する弾性環を嵌合保持してあることを特徴とする。
【0012】
【発明の実施の形態】
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は本発明に係る舵取装置の実施の形態1の構成を示す断面図、図2は図1のII−II線の拡大断面図である。
【0013】
図1に示したラックピニオン式の舵取装置は、下端部にピニオン1aが設けられ、上端部が舵取手段に繋がれて舵取手段による舵取り操作に応じて回転するピニオン軸1と、ピニオン1aに噛合するラック歯2aが設けられ、ピニオン軸1に連動して軸長方向への移動が可能なラック軸2と、これらピニオン軸1及びラック軸2を支持する支持体3と、ラック軸2のラック歯2aと反対側に配置されラック軸2の移動を案内する案内溝41を有する案内体4と、該案内体4をラック軸2に向けて付勢する弾性体5とを備えている。
【0014】
ラック軸2は、長手方向中間に前記ラック歯2aが設けられ、該ラック歯2aと直交する上部及び下部に平取面からなる非円形係合部2b,2bが設けられている。また、非円形係合部2b,2bの間は円弧面になっている。
【0015】
案内体4は円形の周面4a、換言すればほぼ真円の周面を有する円柱形に形成されており、長手方向の一端に、ラック軸2の途中が挿入され、ラック軸2の非円形係合部2b,2bに係合する凹形の案内溝41が設けられている。また、案内体4の他端部外周面には長手方向に離隔して2つの環状溝42,42が設けられており、各環状溝42,42に支持体3の後記する支持孔に接触する合成ゴム性のOリングを用いてなる弾性環6,6を保持してある。
【0016】
支持体3は、図1に示すように有底の第1軸孔31と、該第1軸孔31の中心に対し偏位した位置から第1軸孔31と交差して貫通する第2軸孔32と、該第2軸孔32から外面に開放された支持孔33とを備え、アルミニウム材料をダイカスト成形してある。この支持体3の第1軸孔31に軸受7,7を介してピニオン軸1を回転自在に支持し、第2軸孔32にラック軸2を移動自在に支持し、支持孔33に案内体4を摺動自在に支持している。
【0017】
この支持孔33は、ラック軸2の軸長方向と直交する方向の寸法が小となり、ラック軸2の軸長方向の寸法が大となる略楕円形、換言すれば長円形の周面になっている。また、支持孔33は、ラック軸2の軸長方向と直交する方向の寸法を案内体4の直径寸法よりも僅かに大きくし、案内体4の円滑な摺動性を維持することができるとともに、支持孔33内で案内体4をラック軸2の軸長方向へ相対移動させることができ、さらに、案内体4がラック軸2の軸長方向と直交する方向へ動く動き量を少なくすることができるようにしてある。このように略楕円形とした支持孔33は支持体3の成形時に成形される。
【0018】
また、支持孔33には案内体4の抜け出しを禁止する蓋体8が螺着されており、該蓋体8と案内体4との間にコイルバネを用いてなる弾性体5を介してあり、該弾性体5が案内体4を付勢し、該案内体4の案内溝41をラック軸2のラック歯2aと反対側面に接触させている。
【0019】
以上のように構成された舵取装置は、外周面の環状溝42,42に弾性環6,6が保持された案内体4及び弾性体5を支持体3の支持孔33に挿入し、各弾性環6,6の外周面を支持孔33に接触させ、蓋体8を支持孔33に螺着することにより、案内体4の案内溝41をラック軸2の非円形係合部2b,2bに接触させる。この場合、案内体4は円形の周面4aであり、支持孔33は案内体4を支持孔33内でラック軸2の軸長方向へ動かせることが可能な略楕円形(長円形)の周面であるため、舵取手段による舵取り操作に応じてピニオン1aが回転し、ラック軸2が軸長方向へ移動する移動初期には、案内溝41及びラック軸2の間の摩擦抵抗により案内体4がラック軸2と一体化してラック軸2の軸長方向へ動き、この動き量が最大となる位置で案内体4の周面が支持孔33の非円形の周面に接触して案内体4の動きが規制され、この案内体4に対してラック軸2が軸長方向へ移動することになる。この結果、ラック軸2が軸長方向へ移動する移動初期におけるラック軸2の移動負荷を小さくすることができる。
【0020】
しかも、ラック軸2の軸長方向と直交する方向の案内体4及び支持孔33の間の隙間は案内体4をラック軸2の軸長方向へ移動させることができる最小の寸法にすることができるため、ラック軸2から案内溝41に加わる力によって案内体4が支持孔33内で傾斜することを抑制でき、この案内体4の傾斜による音鳴りを抑制することができる。また、このように案内体4が支持孔33内で傾斜することを抑制することができるため、案内体4の全長を比較的短くすることができ、案内体4の小形化、ひいては舵取装置を小形化することができる。
【0021】
また、案内体4の周面には支持孔33に接触する弾性環6,6が保持されているため、案内体4が支持孔33内で傾斜する際においても、案内体4の支持孔33への当接を防ぐことができ、より一層音鳴りをなくすることができる。
【0022】
また、ラック歯2aがラック軸2の軸長方向に対して傾斜しているような場合、従来の舵取装置にあってはピニオン1aからラック歯2aへ回転トルクが加わるとき、ラック歯2aの歯すじに沿ってラック軸2を回転させるように分力が発生し、該分力によりラック軸2が回転方向へ動く、換言すればツイストすることになり、このラック軸2がツイストした後でラック軸2が軸長方向へ移動することになるため、舵取り操作性が悪くなるが、本発明のラック軸2は非円形係合部2b,2bを有しており、案内体4の案内溝41は非円形係合部2b,2bに係合してラック軸2の移動を案内するように構成されているため、案内体4に対するラック軸2の回転方向への動き(ツイスト)を止めることができ、舵取り操作性を向上できる。
【0023】
実施の形態2
図3は実施の形態2の要部の構成を示す拡大断面図である。
この実施の形態2の舵取り装置は、案内体4を円形の周面とし、支持孔33を非円形の周面とする代わりに、支持孔33を円形の周面、換言すればほぼ真円の周面とし、案内体4を、該案内体4を支持孔33内でラック軸2の軸長方向へ動かせることが可能な非円形の周面4bとしたものである。
【0024】
実施の形態2において、案内体4はラック軸2の軸長方向と直交する方向の寸法が大となり、ラック軸2の軸長方向の寸法が小となる略楕円形、換言すれば長円形の周面になっている。また、案内体4は、ラック軸2の軸長方向と直交する方向の寸法を支持孔33の直径寸法よりも僅かに小さくし、案内体4の円滑な摺動性を維持することができるとともに、支持孔33内で案内体4をラック軸2の軸長方向へ相対移動させることができ、さらに、案内体4がラック軸2の軸長方向と直交する方向へ動く動き量を少なくすることができるようにしてある。
また、支持体3はアルミニウム材料をダイカスト成形してあり、この支持体3の成形時に支持孔33が成形される。
【0025】
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。
【0026】
以上説明した実施の形態では、略楕円形を非円形の周面としたが、その他、この非円形の周面は、ラック軸2の軸長方向と直交する方向の寸法を、案内体4よりも支持孔33が大となるようにしてある周面であれば、非円形の周面の形状は特に制限されない。
【0027】
【発明の効果】
以上詳述したように発明によれば、ラック軸が軸長方向へ移動する移動初期におけるラック軸の移動負荷を小さくすることができ、しかも、案内体が支持孔内で傾斜することを抑制でき、この案内体の傾斜による音鳴りを抑制することができる。
また、本発明によれば、部品点数を増加したり、組立て性を悪くしたりすることなく構成することができる。
【図面の簡単な説明】
【図1】本発明に係る舵取装置の実施の形態1の構成を示す断面図である。
【図2】図1のII−II線の拡大断面図である。
【図3】本発明に係る舵取装置の実施の形態2の要部の構成を示す拡大断面図である。
【符号の説明】
1a ピニオン
2 ラック軸
3 支持体
33 支持孔
4 案内体
4a,4b 周面
41 案内溝
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rack and pinion type steering device that is widely used as a type of steering device for automobiles.
[0002]
[Prior art]
The rack-and-pinion type steering device is engaged with a rack shaft that has both ends connected to left and right steering wheels and can move in the axial direction in accordance with the operation of the steering means, and rack teeth of the rack shaft. A pinion and a housing that supports the pinion and the rack shaft are provided, the steering operation force is transmitted to the rack shaft through the pinion and the rack teeth, the rack shaft is moved in the axial length direction, and left and right steering is performed. It is configured to steer the wheel.
[0003]
In such a rack and pinion type steering device, the backlash amount of the meshing part of the pinion and the rack teeth is reduced, and the rack shaft is moved to the position opposite to the rack teeth so that the rack shaft can be moved smoothly. A cylindrical guide body having a guide groove for guiding the movement of the rack shaft and a support body having a circular peripheral surface support hole for slidably supporting the guide body are provided. The rack shaft is configured to come into contact with the opposite side surface of the rack shaft and guide the movement of the rack shaft (for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 58-1987
[Problems to be solved by the invention]
By the way, a gap for sliding the guide body in the support hole is provided between the guide body and the support hole. When the gap is increased, the force applied to the guide groove from the rack shaft is increased. Since the guide body is inclined in the support hole and both ends of the guide body abut on the support hole and make a sound, the gap is basically made small.
[0006]
However, since the amount of movement of the guide body in the radial direction is very small when the gap is reduced, the rack shaft is pivoted by the rotational force transmitted from the pinion while the guide groove is in contact with the rack shaft. In the initial stage of movement to move in the long direction, the rack shaft moves in the axial direction with respect to the guide body by overcoming the frictional resistance between the guide groove and the rack shaft. The rotational torque of the pinion that meshes with the rack teeth of the shaft increases, resulting in a decrease in steering operability.
[0007]
The present invention has been made in view of such circumstances, and can prevent the guide body from tilting and making noise in the support hole, and the rack shaft can be moved in the axial direction at the initial stage of movement. It aims at providing the steering device which can reduce a moving load.
[0008]
[Means for Solving the Problems]
A steering apparatus according to a first aspect of the present invention is a rack shaft that is connected to a steering means via a pinion and can move in the axial direction in accordance with the operation of the steering means, and a guide that guides the movement of the rack axis. In a steering apparatus including a guide body having a groove and a support body having a support hole for supporting the guide body, one of the guide body and the support hole is a longitudinal section along the axial length direction of the rack shaft. And the other of the guide body and the support hole is a substantially elliptical peripheral surface, and the axial length of the rack shaft is the peripheral surface of the guide body and the support hole. The size of the direction perpendicular to the direction is larger than that of the guide body, the support hole is larger than the guide body, and the guide body can be moved together with the rack shaft in the support hole in the axial length direction of the rack shaft at the initial stage of movement of the rack shaft. The peripheral surface of the guide body becomes the peripheral surface of the support hole at the position where the amount of body movement is maximum Wherein the touch to are so as to restrict the movement of the guide member.
[0009]
In the first invention, since the guide body can be moved in the axial direction of the rack shaft within the support hole, the guide groove and the rack are in the initial stage of movement when the rack shaft moves in the axial direction. The guide body is integrated with the rack shaft by the frictional resistance between the shafts and moves in the axial direction of the rack shaft. After this movement, the circular peripheral surface and the noncircular peripheral surfaces come into contact with each other. The movement of the rack shaft is restricted, and the rack shaft moves in the axial length direction with respect to the guide body. In this way, at the initial stage of movement when the rack shaft moves in the axial direction, the guide body moves integrally with the rack shaft, so that the movement load of the rack shaft can be reduced. In addition, since the gap between the guide body and the support hole in the direction orthogonal to the axial length direction of the rack shaft can be reduced on the peripheral surfaces of the guide body and the support hole, the guide body is applied by the force applied from the rack shaft to the guide groove. Can be suppressed from being tilted in the support hole, and noise generated by the tilt of the guide body can be suppressed. In addition, the configuration can be simplified by simply changing the dimensions of the guide body and the support hole, and the configuration can be achieved without increasing the number of parts or degrading the assemblability.
[0010]
The steering apparatus according to a second aspect of the present invention is characterized in that a portion of the rack shaft guided by the guide groove is provided with a non-circular engagement portion that engages with the guide groove.
The steering device according to a third aspect of the invention is characterized in that the circumferential surface of the guide body has an annular groove, and an elastic ring that contacts the circumferential surface of the support hole is fitted and held in the annular groove. To do.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
Embodiment 1
FIG. 1 is a cross-sectional view showing the configuration of Embodiment 1 of the steering apparatus according to the present invention, and FIG. 2 is an enlarged cross-sectional view taken along the line II-II in FIG.
[0013]
The rack and pinion type steering apparatus shown in FIG. 1 has a pinion 1a provided at the lower end portion, the pinion shaft 1 which is connected to the steering means at the upper end portion and rotates according to the steering operation by the steering means, and the pinion A rack tooth 2a that meshes with 1a, a rack shaft 2 that is movable in the axial direction in conjunction with the pinion shaft 1, a support body 3 that supports the pinion shaft 1 and the rack shaft 2, and a rack shaft A guide body 4 having a guide groove 41 disposed on the opposite side of the rack teeth 2a and guiding the movement of the rack shaft 2, and an elastic body 5 for biasing the guide body 4 toward the rack shaft 2. Yes.
[0014]
The rack shaft 2 is provided with the rack teeth 2a in the middle in the longitudinal direction, and is provided with non-circular engaging portions 2b and 2b made of a flat surface on the upper and lower sides orthogonal to the rack teeth 2a. Further, a circular arc surface is formed between the non-circular engaging portions 2b and 2b.
[0015]
The guide body 4 is formed in a cylindrical shape having a circular peripheral surface 4a, in other words, a substantially perfect circular peripheral surface, and the middle of the rack shaft 2 is inserted into one end in the longitudinal direction so that the non-circular shape of the rack shaft 2 is obtained. A concave guide groove 41 that engages with the engaging portions 2b, 2b is provided. Further, two annular grooves 42 and 42 are provided on the outer peripheral surface of the other end portion of the guide body 4 so as to be separated from each other in the longitudinal direction, and the annular grooves 42 and 42 are in contact with support holes described later on the support body 3. The elastic rings 6 and 6 using synthetic rubber O-rings are held.
[0016]
As shown in FIG. 1, the support 3 has a bottomed first shaft hole 31 and a second shaft that intersects and penetrates the first shaft hole 31 from a position displaced from the center of the first shaft hole 31. A hole 32 and a support hole 33 opened to the outer surface from the second shaft hole 32 are provided, and an aluminum material is die-cast. The pinion shaft 1 is rotatably supported by the first shaft hole 31 of the support 3 via bearings 7 and 7, the rack shaft 2 is supported by the second shaft hole 32, and the guide body is supported by the support hole 33. 4 is slidably supported.
[0017]
The support hole 33 has a substantially elliptical shape in which the dimension in the direction perpendicular to the axial direction of the rack shaft 2 is small and the dimension in the axial direction of the rack shaft 2 is large, in other words, an elliptical peripheral surface. ing. Further, the support hole 33 has a dimension in the direction orthogonal to the axial length direction of the rack shaft 2 slightly larger than the diameter dimension of the guide body 4, and can maintain smooth sliding performance of the guide body 4. The guide body 4 can be relatively moved in the axial direction of the rack shaft 2 in the support hole 33, and the amount of movement of the guide body 4 in the direction orthogonal to the axial length direction of the rack shaft 2 can be reduced. It is made to be able to. Thus, the substantially elliptical support hole 33 is formed when the support 3 is formed.
[0018]
Further, a lid body 8 that prohibits the guide body 4 from being pulled out is screwed into the support hole 33, and an elastic body 5 using a coil spring is interposed between the lid body 8 and the guide body 4, The elastic body 5 biases the guide body 4, and the guide groove 41 of the guide body 4 is brought into contact with the side surface opposite to the rack teeth 2 a of the rack shaft 2.
[0019]
In the steering device configured as described above, the guide body 4 and the elastic body 5 in which the elastic rings 6 and 6 are held in the annular grooves 42 and 42 on the outer peripheral surface are inserted into the support holes 33 of the support body 3. The outer peripheral surfaces of the elastic rings 6, 6 are brought into contact with the support holes 33, and the lid body 8 is screwed into the support holes 33, so that the guide grooves 41 of the guide body 4 are formed into the non-circular engaging portions 2 b, 2 b of the rack shaft 2. Contact. In this case, the guide body 4 has a circular peripheral surface 4a, and the support hole 33 has a substantially elliptical (oval) circumference that can move the guide body 4 in the axial direction of the rack shaft 2 within the support hole 33. Since the pinion 1a rotates according to the steering operation by the steering means and the rack shaft 2 moves in the axial direction, the guide body is caused by the frictional resistance between the guide groove 41 and the rack shaft 2. 4 is integrated with the rack shaft 2 and moves in the axial direction of the rack shaft 2, and the guide body 4 comes into contact with the non-circular peripheral surface of the support hole 33 at a position where the amount of movement is maximum. 4 is restricted, and the rack shaft 2 moves in the axial length direction with respect to the guide body 4. As a result, the movement load of the rack shaft 2 in the initial stage of movement when the rack shaft 2 moves in the axial direction can be reduced.
[0020]
In addition, the gap between the guide body 4 and the support hole 33 in the direction orthogonal to the axial length direction of the rack shaft 2 is set to a minimum dimension capable of moving the guide body 4 in the axial length direction of the rack shaft 2. Therefore, it is possible to suppress the guide body 4 from being inclined in the support hole 33 by the force applied to the guide groove 41 from the rack shaft 2, and it is possible to suppress the noise caused by the inclination of the guide body 4. Further, since the guide body 4 can be prevented from inclining in the support hole 33 in this way, the overall length of the guide body 4 can be made relatively short, and the guide body 4 can be downsized, and consequently the steering device. Can be miniaturized.
[0021]
Further, since the elastic rings 6 and 6 that are in contact with the support hole 33 are held on the peripheral surface of the guide body 4, the support hole 33 of the guide body 4 even when the guide body 4 is inclined in the support hole 33. It is possible to prevent the sound from coming into contact with the sound and to further eliminate noise.
[0022]
Further, when the rack teeth 2a are inclined with respect to the axial direction of the rack shaft 2, in the conventional steering device, when rotational torque is applied from the pinion 1a to the rack teeth 2a, the rack teeth 2a A component force is generated so as to rotate the rack shaft 2 along the tooth trace, and the rack shaft 2 moves in the rotation direction by the component force, in other words, twists. After the rack shaft 2 is twisted, Since the rack shaft 2 moves in the axial direction, the steering operability is deteriorated. However, the rack shaft 2 of the present invention has non-circular engaging portions 2b and 2b, and the guide groove of the guide body 4 is provided. 41 is configured to engage the non-circular engaging portions 2b and 2b to guide the movement of the rack shaft 2, and therefore stops the movement (twist) of the rack shaft 2 relative to the guide body 4 in the rotational direction. And the steering operability can be improved.
[0023]
Embodiment 2
FIG. 3 is an enlarged cross-sectional view showing a configuration of a main part of the second embodiment.
In the steering device of the second embodiment, instead of using the guide body 4 as a circular peripheral surface and the support hole 33 as a noncircular peripheral surface, the support hole 33 is a circular peripheral surface, in other words, a substantially perfect circle. The guide body 4 is a non-circular peripheral surface 4 b that can move the guide body 4 in the axial direction of the rack shaft 2 within the support hole 33.
[0024]
In the second embodiment, the guide body 4 has a substantially elliptical shape in which the dimension in the direction orthogonal to the axial direction of the rack shaft 2 is large and the dimension in the axial direction of the rack shaft 2 is small, in other words, an elliptical shape. It is a surface. Moreover, the guide body 4 can maintain the smooth slidability of the guide body 4 by making the dimension in the direction orthogonal to the axial length direction of the rack shaft 2 slightly smaller than the diameter dimension of the support hole 33. The guide body 4 can be relatively moved in the axial direction of the rack shaft 2 in the support hole 33, and the amount of movement of the guide body 4 in the direction orthogonal to the axial length direction of the rack shaft 2 can be reduced. It is made to be able to.
The support 3 is formed by die-casting an aluminum material, and the support hole 33 is formed when the support 3 is formed.
[0025]
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.
[0026]
In the embodiment described above, the substantially elliptical shape is a non-circular peripheral surface. In addition, the non-circular peripheral surface has a dimension in a direction perpendicular to the axial direction of the rack shaft 2 from the guide body 4. However, the shape of the non-circular peripheral surface is not particularly limited as long as the support hole 33 has a large peripheral surface.
[0027]
【The invention's effect】
As described above in detail, according to the present invention, the movement load of the rack shaft at the initial stage of movement when the rack shaft moves in the axial length direction can be reduced, and the inclination of the guide body in the support hole can be suppressed. It is possible to suppress the noise due to the inclination of the guide body.
Moreover, according to this invention, it can comprise, without increasing a number of parts or making assembly property worse.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a steering apparatus according to a first embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view taken along line II-II in FIG.
FIG. 3 is an enlarged cross-sectional view showing a configuration of a main part of a steering device according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a Pinion 2 Rack axis | shaft 3 Support body 33 Support hole 4 Guide body 4a, 4b Circumferential surface 41 Guide groove

Claims (3)

舵取手段にピニオンを介して繋がり、舵取手段の操作に応じて軸長方向への移動が可能なラック軸と、該ラック軸の移動を案内する案内溝を有する案内体と、該案内体を支持する支持孔を有する支持体とを備えた舵取装置において、前記案内体及び前記支持孔の一方は前記ラック軸の軸長方向に沿った縦断面の形状が円形の周面であり、案内体及び支持孔の他方は前記縦断面の形状が略楕円形の周面であり、且つ前記案内体及び支持孔の周面で前記ラック軸の軸長方向と直交する方向の寸法を、案内体よりも支持孔が大となり、前記ラック軸の移動初期に該ラック軸とともに前記案内体を支持孔内で前記ラック軸の軸長方向へ動かせるとともに、案内体の動き量が最大となる位置で案内体の周面が支持孔の周面に接触して案内体の動きを規制するようにしてあることを特徴とする舵取装置。A rack shaft connected to the steering means via a pinion and capable of moving in the axial direction in accordance with the operation of the steering means, a guide body having a guide groove for guiding the movement of the rack shaft, and the guide body A steering device including a support body having a support hole for supporting the guide body, and one of the guide body and the support hole is a circumferential surface having a circular shape in a longitudinal section along an axial length direction of the rack shaft , The other of the guide body and the support hole is a circumferential surface having a substantially elliptical cross-sectional shape, and guides the dimensions in the direction perpendicular to the axial direction of the rack shaft on the circumferential surface of the guide body and the support hole. The support hole is larger than the body, and at the initial stage of movement of the rack shaft, the guide body together with the rack shaft can be moved in the axial direction of the rack shaft in the support hole, and the amount of movement of the guide body is maximized. The peripheral surface of the guide body contacts the peripheral surface of the support hole to restrict the movement of the guide body. Steering apparatus characterized by you have to so that. 前記ラック軸の前記案内溝により案内される部位は、前記案内溝に係合する非円形係合部を設けてある請求項1記載の舵取装置。The steering apparatus according to claim 1, wherein a portion of the rack shaft guided by the guide groove is provided with a non-circular engaging portion that engages with the guide groove. 前記案内体の周面は環状溝を有し、該環状溝に、前記支持孔の周面に接触する弾性環を嵌合保持してある請求項1又は2記載の舵取装置。The steering device according to claim 1 or 2, wherein the circumferential surface of the guide body has an annular groove, and an elastic ring that contacts the circumferential surface of the support hole is fitted and held in the annular groove.
JP2002294088A 2002-10-07 2002-10-07 Steering device Expired - Fee Related JP4214752B2 (en)

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JP4214752B2 true JP4214752B2 (en) 2009-01-28

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JP4631535B2 (en) 2005-05-18 2011-02-16 株式会社ジェイテクト Rack guide and rack and pinion type steering device provided with the rack guide
JP4367432B2 (en) * 2006-04-24 2009-11-18 オイレス工業株式会社 Rack and pinion type steering device

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