JP2001278074A - Steering device - Google Patents
Steering deviceInfo
- Publication number
- JP2001278074A JP2001278074A JP2000095967A JP2000095967A JP2001278074A JP 2001278074 A JP2001278074 A JP 2001278074A JP 2000095967 A JP2000095967 A JP 2000095967A JP 2000095967 A JP2000095967 A JP 2000095967A JP 2001278074 A JP2001278074 A JP 2001278074A
- Authority
- JP
- Japan
- Prior art keywords
- rack
- steering
- shaft
- recesses
- rack shaft
- 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.)
- Pending
Links
- 238000005480 shot peening Methods 0.000 claims abstract description 9
- 238000005260 corrosion Methods 0.000 claims abstract description 4
- 230000007797 corrosion Effects 0.000 claims abstract description 4
- 239000000314 lubricant Substances 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 abstract description 14
- 239000000463 material Substances 0.000 abstract description 9
- 230000001050 lubricating effect Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 6
- 239000004519 grease Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000002730 additional effect Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Landscapes
- Transmission Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ラック・ピニオン
式舵取装置のラック軸等、舵取り操作に応じて軸長方向
に移動する舵取り軸を備える舵取装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering device having a steering shaft, such as a rack shaft of a rack and pinion type steering device, which moves in an axial direction according to a steering operation.
【０００２】[0002]
【従来の技術】自動車用の舵取装置の一形式として広く
採用されているラック・ピニオン式舵取装置は、舵輪
（ステアリングホイール）に連動連結されたピニオンを
車体の左右方向に延設されたラック軸の中途部に噛合さ
せ、舵取りのための舵輪の回転操作に連動する前記ピニ
オンの回転を前記ラック軸の軸長方向の移動に変換し、
この移動を各別のタイロッドを介して左右の操向車輪
（一般的には前輪）に伝えて舵取りを行わせる構成とな
っている。2. Description of the Related Art A rack and pinion type steering device widely used as one type of steering device for an automobile has a pinion interlockingly connected to a steering wheel (steering wheel) extending in the lateral direction of a vehicle body. Meshing with the middle part of the rack shaft, converting the rotation of the pinion interlocked with the rotation operation of the steering wheel for steering into movement in the axial direction of the rack shaft,
This movement is transmitted to the left and right steering wheels (generally, the front wheels) via the respective tie rods to perform steering.
【０００３】このようなラック・ピニオン式舵取装置に
おいて、舵取り軸としてのラック軸は、車体に固定され
た筒形のハウジングの内部に軸長方向への移動自在に支
持され、該ハウジングの両側に突出する両端部に前記タ
イロッドが連結されている。前記ハウジングの内部での
ラック軸は、前記ピニオンとの噛合部背面に弾接するサ
ポートヨークと、ハウジングの一端部又は両端部に嵌着
された筒形のラックブッシュとを支持部として２点又は
３点支持されている。In such a rack and pinion type steering device, a rack shaft as a steering shaft is supported movably in an axial direction inside a cylindrical housing fixed to a vehicle body, and is provided on both sides of the housing. The tie rods are connected to both ends protruding from the tie rod. The rack shaft inside the housing has a support yoke elastically contacting the back surface of the meshing portion with the pinion, and a cylindrical rack bush fitted at one end or both ends of the housing as two or three support portions. Point is supported.
【０００４】[0004]
【発明が解決しようとする課題】以上の如きラック・ピ
ニオン式舵取装置において、舵取り軸としてのラック軸
の移動は、前記サポートヨーク及びラックブッシュに対
する摺動を伴って生じるから、舵輪の操作に要する力を
軽減し、滑らかな舵取り操作を実現するためには、前述
の如きラック軸の支持部における摺動抵抗を低減する必
要がある。そこで従来から、研磨、バフ加工等の仕上げ
加工によりラック軸の外面の仕上げ精度を上げ、また、
夫々の支持部に組立て時にグリス等の潤滑材を供給し
て、該潤滑材による潤滑下にて摺動を行わせる等の摺動
抵抗の低減対策がなされている。In the rack and pinion type steering apparatus as described above, the movement of the rack axis as the steering axis occurs along with the sliding of the support yoke and the rack bush. In order to reduce the required force and realize a smooth steering operation, it is necessary to reduce the sliding resistance in the rack shaft support as described above. Therefore, conventionally, the finishing accuracy of the outer surface of the rack shaft has been increased by finishing such as polishing and buffing.
At the time of assembling, a lubricating material such as grease is supplied to each of the supporting portions, and measures are taken to reduce sliding resistance, such as sliding under lubrication by the lubricating material.
【０００５】しかしながら、ラック軸外面の仕上げ精度
を上げる方法においては、加工に要する手間が大幅に増
すにも拘らず、実際に得られる摺動抵抗の低減効果が小
さいという問題がある。またラック軸の支持部に潤滑材
を供給する方法においては、組立て時に供給された潤滑
材が摺動の繰り返しにより徐々に失われる結果、組立て
初期に得られる摺動抵抗の低減効果を長期に亘って維持
することが難しいという問題があって、いずれの方法に
おいても満足すべき結果は得られない。However, in the method of increasing the finishing accuracy of the outer surface of the rack shaft, there is a problem that the effect of reducing the actually obtained sliding resistance is small although the labor required for processing is greatly increased. Further, in the method of supplying the lubricant to the support portion of the rack shaft, the lubricant supplied at the time of assembly is gradually lost due to repetition of sliding, and as a result, the effect of reducing the sliding resistance obtained at the initial stage of assembly over a long period of time. However, there is a problem that it is difficult to maintain the results, and satisfactory results cannot be obtained by any of the methods.
【０００６】このような問題は、ラック・ピニオン式の
舵取装置に限らず、舵取り操作に応じて軸長方向に移動
する舵取り軸を備える各種の形式の舵取装置において全
く同様に発生する問題であり、前記舵取り軸の支持部に
おける摺動抵抗を長期に亘って有効に低減することが切
望されている。[0006] Such a problem is not limited to a rack and pinion type steering device, but occurs in exactly the same manner in various types of steering devices having a steering shaft that moves in the axial direction according to a steering operation. Therefore, it is desired to effectively reduce the sliding resistance in the support portion of the steering shaft over a long period of time.
【０００７】本発明は斯かる事情に鑑みてなされたもの
であり、舵取り操作に応じて軸長方向に移動する舵取り
軸の支持部に発生する摺動抵抗を、長期に亘って有効に
低減せしめることができ、小なる摺動抵抗の作用下にて
滑らかな舵取り操作が可能な舵取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 effectively reduces the sliding resistance generated in a support portion of a steering shaft that moves in the axial direction in response to a steering operation for a long period of time. It is an object of the present invention to provide a steering device capable of performing a smooth steering operation under the action of small sliding resistance.
【０００８】[0008]
【課題を解決するための手段】本発明の第１発明に係る
舵取装置は、ハウジングの内部に支持され、舵取り操作
に応じて支持部に摺接しつつ軸長方向に移動する舵取り
軸を備える舵取装置において、前記舵取り軸及び／又は
支持部の他方との摺接面に、潤滑材を保持すべく分布形
成された複数の凹所を備えることを特徴とする。A steering apparatus according to a first aspect of the present invention includes a steering shaft which is supported inside a housing and which moves in an axial direction while slidingly contacting a support portion in accordance with a steering operation. The steering device is characterized in that a plurality of recesses are formed on the sliding contact surface with the other of the steering shaft and / or the supporting portion so as to hold a lubricant.
【０００９】本発明においては、舵取り軸と支持部との
摺接面の一方又は両方に、全面に亘って分布する複数の
凹所を形成しておき、これらの凹所の内部に組立て初期
に供給される潤滑材を保持させ、摺動の繰り返しに伴う
潤滑材の喪失を防止して、潤滑材の作用下での低い摺動
抵抗を長期に亘って維持する。In the present invention, a plurality of recesses distributed over the entire surface are formed on one or both of the sliding surfaces of the steering shaft and the support portion, and the recesses are initially formed inside these recesses. The lubricating material to be supplied is held to prevent loss of the lubricating material due to repeated sliding, and to maintain a low sliding resistance under the action of the lubricating material for a long time.
【００１０】また第２発明に係る舵取装置は、第１発明
における舵取り軸が、舵輪と連動回転するピニオンに噛
合するラック歯をその一部に備えるラック軸であること
を特徴とする。A steering apparatus according to a second aspect of the present invention is characterized in that the steering shaft according to the first aspect of the invention is a rack shaft having a part of a rack tooth meshing with a pinion that rotates in conjunction with the steering wheel.
【００１１】本発明においては、操向用の車輪からの作
用力により撓みが生じ易く、摺動抵抗が大きいラック・
ピニオン式舵取装置のラック軸と、該ラック軸の支持部
との摺接面に潤滑材を保持する複数の凹所を分布形成
し、摺動抵抗を長期に亘って有効に低減し、滑らかな舵
取り動作を行わせる。[0011] In the present invention, the rack or the like is liable to be bent by the acting force from the steering wheel and has a large sliding resistance.
A rack shaft of a pinion type steering device and a plurality of recesses for holding a lubricant are formed on a sliding surface of the rack shaft in contact with a support portion of the rack shaft. Perform a proper steering operation.
【００１２】第３発明に係る舵取装置は、第１発明又は
第２発明における凹所が、前記摺接面のショットピーニ
ング加工により形成してあることを特徴とし、第４発明
に係る舵取装置は、第１発明又は第２発明における凹所
が、前記摺接面の表面腐食加工により形成してあること
を特徴とする。A steering apparatus according to a third invention is characterized in that the recess according to the first invention or the second invention is formed by shot peening the sliding surface. The device is characterized in that the recess in the first invention or the second invention is formed by surface corrosion processing of the sliding contact surface.
【００１３】これらの発明においては、ショットピーニ
ング加工又は表面腐食加工により、摺接面の全体に分布
する多数の凹所を簡易に形成し、滑らかな操作が可能な
舵取装置を、多大の加工工数を要することなく実現す
る。In these inventions, a large number of recesses distributed over the entire sliding contact surface can be easily formed by shot peening or surface erosion, and a steering device capable of smooth operation can be manufactured by a large amount of machining. It is realized without man-hours.
【００１４】[0014]
【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。図１は、本発明に係る舵取
装置の要部の構成を示す正面断面図である。図示の舵取
装置は、舵取り操作に応じて軸回りに回転するピニオン
軸２の回転を、該ピニオン軸２に噛合するラック軸（舵
取り軸）１の軸長方向の移動に変換して舵取りを行わせ
るラック・ピニオン式の舵取装置として構成されてい
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is a front sectional view showing a configuration of a main part of a steering device according to the present invention. The illustrated steering device converts the rotation of a pinion shaft 2 that rotates around an axis in response to a steering operation into a movement in the axial direction of a rack shaft (steering shaft) 1 that meshes with the pinion shaft 2 to perform steering. It is configured as a rack and pinion type steering device to be operated.
【００１５】舵取り軸としてのラック軸１は、図示しな
い車体の左右方向に延設された筒形をなすラックハウジ
ングＨ1 の内部に軸長方向への移動自在に支持されてい
る。該ラックハウジングＨ1 の一側端部の近傍にはピニ
オンハウジングＨ2 が連設されており、該ピニオンハウ
ジングＨ2 の内部には、前記ラック軸１と交叉する軸回
りに回転自在にピニオン軸２が支持されている。[0015] rack shaft 1 as a steering shaft is movably supported in the axial direction inside the rack housing H 1 forming the lateral direction extending in-cylinder-shaped body, not shown. In the vicinity of one end of the rack housing H 1 and the pinion housing H 2 is continuously provided in the interior of the pinion housing H 2, rotatably pinion shaft about an axis intersecting with the rack shaft 1 2 are supported.
【００１６】ラックハウジングＨ1 内に支持されたラッ
ク軸１の中途部外面には、前記ピニオン軸２との交叉位
置を臨む所定の長さ範囲に亘ってラック歯10が形成され
ており、該ラック歯10は、前記ピニオン軸２の下半部に
一体形成されたピニオン20に噛合させてある。[0016] The intermediate portion outer surface of the rack housing H 1 rack shaft supported in one, and the rack teeth 10 is formed over a predetermined length range facing the intersecting position between the pinion shaft 2, the The rack teeth 10 are engaged with a pinion 20 formed integrally with the lower half of the pinion shaft 2.
【００１７】ピニオン軸２の上部は、ピニオンハウジン
グＨ2 の上側外部に適長突出され、この突出端部は、図
示しない舵輪（ステアリングホイール）に連結されてお
り、前記ピニオン軸２及びこれと一体形成されたピニオ
ン20は、舵取りのための前記舵輪の操作に応じて軸回り
に回転し、この回転がピニオン20とラック歯10との噛合
部においてラック軸１の軸長方向の移動に変換され、該
ラック軸１がラックハウジングＨ1 の内部において軸長
方向に移動する構成となっている。The upper portion of the pinion shaft 2 is suitable length protrudes upward outside of the pinion housing H 2, the protruding end portion is connected to an unillustrated steering wheel (steering wheel), integrated 2 and therewith the pinion shaft The formed pinion 20 rotates around the axis in accordance with the operation of the steering wheel for steering, and this rotation is converted into movement in the axial direction of the rack shaft 1 at the meshing portion between the pinion 20 and the rack teeth 10. has a structure in which the rack shaft 1 is moved in the axial direction inside the rack housing H 1.
【００１８】このように移動するラック軸１の両端部
は、ラックハウジングＨ1 の両側外部に適長突出され、
これらの突出端は、図示しない左右両側の操向車輪（一
般的には前輪）に各別の玉継手11，11及びタイロッド1
2，12を介して連結されている。この構成により、舵輪
の操作に応じて前述の如く生じるラック軸１の移動は、
前記玉継手11，11及びタイロッド12，12を介して左右の
操向車輪に伝えられ、これらの向きが、前記操作の方向
に操作量に応じて変えられて舵取りがなされる。The opposite ends of the rack shaft 1 to move in this way is suitable length protrudes on either side outside of the rack housing H 1,
These protruding ends are respectively attached to the left and right steering wheels (generally the front wheels) (not shown) by separate ball joints 11 and 11 and tie rods 1.
It is connected via 2,12. With this configuration, the movement of the rack shaft 1 that occurs as described above in accordance with the operation of the steering wheel,
The steering is transmitted to the left and right steering wheels via the ball joints 11, 11 and the tie rods 12, 12, and the directions are changed in the direction of the operation in accordance with the amount of operation to perform steering.
【００１９】以上の如く構成された本発明に係る舵取装
置において、前記ラック軸１は、公知の如く、前記ピニ
オン軸２との噛合部位にラック歯10の形成側と逆側（図
の手前側）の面から弾接するサポートヨーク21と、前記
噛合部位から離れた側のラックハウジングＨ1 の端部内
周に嵌着固定された円筒形のラックブッシュ22とを支持
部として２点支持されている。In the steering apparatus according to the present invention configured as described above, the rack shaft 1 is connected to the pinion shaft 2 at a position opposite to the side where the rack teeth 10 are formed (as shown in the figure). a support yoke 21 elastically contacting the surface on the side), and the side remote from the engagement portion rack housing of an H 1 in the peripheral edge portion of the fitting fixed cylindrical rack bushing 22 is supported two-point as a support I have.
【００２０】この支持構造により舵輪の操作に応じたラ
ック軸１の移動は、前記サポートヨーク21及びラックブ
ッシュ22との当接面への摺接を伴って生じることとな
り、この際に夫々の摺接面に加わる摺動抵抗、特に、全
周に亘って摺接するラックブッシュ22との間の摺動抵抗
が、前記移動によって前述の如く行われる舵取り動作の
滑らかさを阻害する一因となっている。本発明において
は、以下の構成により前記ラック軸１の摺動抵抗を軽減
するようにしている。With this support structure, the movement of the rack shaft 1 in accordance with the operation of the steering wheel is caused by sliding contact with the contact surface between the support yoke 21 and the rack bush 22. The sliding resistance applied to the contact surface, in particular, the sliding resistance between the rack bush 22 that slides over the entire circumference, is one of the factors that hinders the smoothness of the steering operation performed as described above due to the movement. I have. In the present invention, the sliding resistance of the rack shaft 1 is reduced by the following configuration.
【００２１】図２は、ラックハウジングＨ1 の端部にお
けるラック軸１の支持部近傍の拡大断面図である。図示
の位置にてラック軸１を支持するラックブッシュ22は、
例えば、ラックハウジングＨ1 の端部開口からの圧入に
より、軸長方向及び周方向への移動不可に内嵌固定され
ている。ラック軸１は、このように固定されたラックブ
ッシュ22に挿通され、該ラックブッシュ22との内面との
摺接により軸長方向への移動自在に支えられている。[0021] FIG. 2 is an enlarged sectional view of a supporting portion near the rack shaft 1 in the end of the rack housing H 1. The rack bush 22 that supports the rack shaft 1 at the illustrated position
For example, by press-fitting from the end opening of the rack housing H 1, and is fitted and fixed to the unmovable in the axial direction and the circumferential direction. The rack shaft 1 is inserted into the rack bush 22 fixed in this way, and is supported so as to be movable in the axial direction by sliding contact with the inner surface of the rack bush 22.
【００２２】以上の如きラック軸１の外周面には、図２
中に円形及び楕円形のシンボルによって示すように、全
面に亘って分布する多数の凹所1a，1a…が形成されてお
り、これらの凹所1a，1a…の形成面が前記ラックブッシ
ュ22と摺接するようになしてある。これらの凹所1a，1a
…の形成範囲は、図１中にハッチングを施して示すよう
に、ラックブッシュ22との嵌合部の両側に前記ラック歯
10の形成長さＬと略等しい長さＬ′を有して設定されて
おり、前記凹所1a，1a…の形成面のラックブッシュ22に
対する摺動が、前記ラック歯10の長さ範囲内にて生じる
ラック軸１の移動ストロークの全域に亘って生じるよう
になしてある。The outer peripheral surface of the rack shaft 1 as described above is
As shown by circular and elliptical symbols therein, a number of recesses 1a, 1a ... distributed over the entire surface are formed, and the formation surfaces of these recesses 1a, 1a ... It comes in sliding contact. These recesses 1a, 1a
Are formed on both sides of the fitting portion with the rack bush 22, as shown by hatching in FIG.
Are formed so as to have a length L 'substantially equal to the formation length L of the rack teeth 10 so that the sliding surface of the formation surface of the recesses 1a, 1a. , Which occurs over the entire range of the movement stroke of the rack shaft 1.
【００２３】このようなラック軸１のラックハウジング
Ｈ1 への組み付けは、従来から行われているように、グ
リス等の潤滑材をラック軸１の外周面に塗布した状態で
なされ、該ラック軸１の前記ラックブッシュ22（及びサ
ポートヨーク21）に対する摺動が、前記潤滑材による潤
滑下にて行われるようにしてある。ここで本発明に係る
舵取装置においては、ラック軸１の外周面に、ラックブ
ッシュ22に対する摺動長さの全域に亘って多数の凹所1
a，1a…が分布形成されており、組み付けに際して塗布
された潤滑材は夫々の凹所1a，1a…の内部に滞留保持さ
れる。[0023] Such assembly to the rack housing H 1 of the rack shaft 1, as is conventional, be made in a state coated with lubricant such as grease to the outer peripheral surface of the rack shaft 1, the rack shaft The sliding of the first rack bush 22 (and the support yoke 21) is performed under lubrication by the lubricant. Here, in the steering device according to the present invention, a large number of recesses 1 are provided on the outer peripheral surface of the rack shaft 1 over the entire sliding length with respect to the rack bush 22.
are formed in a distributed manner, and the lubricant applied at the time of assembling is retained in the respective recesses 1a.
【００２４】図３は、ラック軸１とラックブッシュ22と
の摺接状態の説明図である。組立て時に供給される潤滑
材Ｇは、本図に示す如く、ラック軸１の外周面に多数形
成された凹所1a，1a…の夫々に滞留保持されている。こ
の状態でラック軸１の摺動が繰り返しなされたとき、該
ラック軸１とラックブッシュ22との間の隙間に介在する
潤滑材Ｇは徐々に失われるが、このとき、各凹所1a，1a
…の内部の潤滑材Ｇが漏れ出して喪失分が補給される。
従って、ラックブッシュ22に対するラック軸１の摺動
は、組立て初期の良好な状態を長期間保って行われるこ
ととなり、小なる摺動抵抗の作用下にて滑らかな舵取り
操作が可能となる。FIG. 3 is an explanatory view of the sliding contact state between the rack shaft 1 and the rack bush 22. As shown in this drawing, the lubricant G supplied at the time of assembling is retained and held in each of a large number of recesses 1a formed on the outer peripheral surface of the rack shaft 1. When the rack shaft 1 is repeatedly slid in this state, the lubricant G interposed in the gap between the rack shaft 1 and the rack bush 22 is gradually lost. At this time, the recesses 1a, 1a
The lubricant G inside the... Leaks out and is replenished.
Accordingly, the sliding of the rack shaft 1 with respect to the rack bush 22 is performed while maintaining a good initial state of the assembly for a long period of time, and a smooth steering operation can be performed under the action of a small sliding resistance.
【００２５】ラック軸１周面の前記凹所1a，1a…は、図
３に示す如く、夫々が異なる断面形状を有していてもよ
く、更に、図示の如き部分円形の断面形状に限らず、異
形断面を有していてもよい。またラック軸１の周面上で
の凹所1a，1a…の分布は、図２に示す如く不規則であっ
てよい。なお、図２中の凹所1a，1a…は、これらの形成
態様を明らかにすべく大サイズに図示されているが、実
際の凹所1a，1a…は、開口部の径が１mm以下の小サイズ
のものである。The recesses 1a on the peripheral surface of the rack shaft 1 may have different cross-sectional shapes as shown in FIG. 3, and are not limited to a partially circular cross-sectional shape as shown in the figure. , May have an irregular cross section. The distribution of the recesses 1a on the peripheral surface of the rack shaft 1 may be irregular as shown in FIG. The recesses 1a, 1a... In FIG. 2 are shown in a large size in order to clarify their formation, but the actual recesses 1a, 1a. It is of small size.
【００２６】以上の如き凹所1a，1a…は、微細な鋼球シ
ョットを、圧縮空気、遠心力の作用によりラック軸１の
周面に打ちつけるショットピーニング加工により形成す
ることができ、また、ラック軸１の材料に対する腐食剤
を用いた表面腐食加工により形成することができる。こ
のように凹所1a，1a…が形成されたラック軸１は、その
後の研磨又は切削により、前記凹所1a，1a…の深さに達
しない範囲にて仕上げ加工され、更に必要な場合、硬度
確保のために表面処理された後にラックハウジングＨ1
に組み付けられる。The recesses 1a, 1a,... As described above can be formed by shot peening in which a fine steel ball shot is hit against the peripheral surface of the rack shaft 1 by the action of compressed air and centrifugal force. It can be formed by surface erosion processing on the material of the shaft 1 using a corrosive agent. The rack shaft 1 in which the recesses 1a, 1a... Are formed is finished by grinding or cutting in a range not reaching the depth of the recesses 1a, 1a. Rack housing H 1 after surface treatment to ensure hardness
Assembled in
【００２７】前記凹所1a，1a…の形成は、適宜の加工手
段により行わせることができるが、前述したショットピ
ーニング加工又は表面腐食加工によれば、ラック軸１の
所要範囲の全体に広く分布する凹所1a，1a…を、容易に
しかも短時間にて形成することができる。更に、ショッ
トピーニング加工を採用した場合、鋼球ショットの衝突
によりラック軸１の周面近傍の応力が均一化され、ラッ
ク軸１の疲れ強さが増す等の付加的な効果が得られる。The recesses 1a, 1a... Can be formed by appropriate processing means. However, according to the shot peening process or the surface erosion process described above, the recesses 1a are widely distributed over the entire required range of the rack shaft 1. Can be formed easily and in a short time. Further, when the shot peening process is employed, additional effects such as the stress near the peripheral surface of the rack shaft 1 being made uniform by the collision of the steel ball shot and the fatigue strength of the rack shaft 1 being increased are obtained.
【００２８】なお以上の実施の形態においては、ラック
軸１の外周面に凹所1a，1a…を形成する構成について述
べたが、同様の凹所をラックブッシュ22の内周面に形成
してもよく、またラック軸１の外周面及びラックブッシ
ュ22の内周面の両方に形成してもよい。In the above embodiment, the configuration in which the recesses 1a, 1a... Are formed on the outer peripheral surface of the rack shaft 1 has been described, but similar recesses are formed on the inner peripheral surface of the rack bush 22. Alternatively, it may be formed on both the outer peripheral surface of the rack shaft 1 and the inner peripheral surface of the rack bush 22.
【００２９】また以上の実施の形態においては、ラック
軸１の一側を支持するラックブッシュ22との摺接面にの
み凹所1a，1a…が形成されているが、他側を支持するサ
ポートヨーク21との摺接面にも同様の凹所を形成しても
よい。In the above embodiment, the recesses 1a, 1a,... Are formed only on the sliding contact surface with the rack bush 22 for supporting one side of the rack shaft 1, but the support for supporting the other side. A similar recess may be formed on the sliding contact surface with the yoke 21.
【００３０】更に以上の実施の形態においては、ラック
・ピニオン式の舵取装置について述べたが、本発明は、
舵取り操作に応じてラックブッシュに摺接しつつ軸長方
向に移動する舵取り軸を備える他の形式の舵取装置にお
いても適用可能であり、同様の効果が得られることは言
うまでもない。In the above embodiments, the rack and pinion type steering device has been described.
The present invention can be applied to other types of steering devices including a steering shaft that moves in the axial direction while sliding on the rack bush in accordance with the steering operation, and it is needless to say that the same effect can be obtained.
【００３１】図４は、本発明による摺動抵抗の低減効果
を調べるべく行った試験結果を示す図である。この試験
は、ショットピーニング加工により前記凹所1a，1a…を
形成した後、表面の仕上げ研磨を行ったラック軸（本発
明品）と、前記凹所1a，1a…を形成せずに同条件の仕上
げ研磨を行ったラック軸（従来品）とを用い、これら
を、夫々の外面に半径方向の押し付け力を加えた状態で
摺動させた際の摺動抵抗の比較を行ったものである。FIG. 4 is a diagram showing the results of a test performed to examine the effect of reducing the sliding resistance according to the present invention. In this test, after the recesses 1a, 1a... Were formed by shot peening, the rack shaft (product of the present invention) whose surface was polished was the same as the rack shaft without forming the recesses 1a, 1a. This is a comparison of the sliding resistance when using a rack shaft (conventional product) that has been subjected to the finish polishing described above and sliding them with a radial pressing force applied to each outer surface. .
【００３２】図中の○印は、本発明品による結果を、同
じく×印は、従来品による結果を夫々示しており、両者
の比較により本発明品においては、種々の押し付け荷重
下における摺動抵抗が、従来品の摺動抵抗の数分の一に
低減されることがわかる。In the figure, the circles indicate the results obtained with the product of the present invention, and the crosses also indicate the results obtained with the conventional product. It can be seen that the resistance is reduced to a fraction of the sliding resistance of the conventional product.
【００３３】[0033]
【発明の効果】以上詳述した如く本発明の第１発明に係
る舵取装置においては、舵取り軸及びラックブッシュの
他方との摺接面に複数の凹所を分布形成し、これらの凹
所にグリス等の潤滑材を保持させる構成としたから、潤
滑材の作用による小なる抵抗下での舵取り軸の摺動を長
期に亘って行わせることができ、滑らかな舵取り動作を
行わせることが可能となる。As described in detail above, in the steering apparatus according to the first aspect of the present invention, a plurality of recesses are formed on the sliding contact surface with the other of the steering shaft and the rack bush, and these recesses are formed. Since the lubricating material such as grease is held in the vehicle, the steering shaft can be slid for a long time under a small resistance due to the action of the lubricating material, and a smooth steering operation can be performed. It becomes possible.
【００３４】また第２発明に係る舵取装置においては、
ラック・ピニオン式舵取装置のラック軸とラックブッシ
ュとの摺接面に潤滑材を保持する凹所を形成したから、
操向車輪からの作用力により撓みが生じ易い前記ラック
軸の摺動抵抗を、長期に亘って効果的に低減することが
できる。In the steering apparatus according to the second invention,
Because the recess that holds the lubricant is formed on the sliding surface between the rack shaft and the rack bush of the rack and pinion steering device,
The sliding resistance of the rack shaft, which is likely to bend due to the acting force from the steered wheels, can be effectively reduced over a long period of time.
【００３５】また第３，第４発明に係る舵取装置におい
ては、舵取り軸とラックブッシュとの摺接面へのショッ
トピーニング加工又は表面腐食加工により凹所を形成し
たから、摺接面の全体に分布する多数の凹所を、簡易に
しかも短時間に形成することができ、舵取り軸の摺動抵
抗が低減され、滑らかな舵取り動作を行わせる効果を容
易に達成することができる等、本発明は優れた効果を奏
する。In the steering apparatus according to the third and fourth aspects of the present invention, the recess is formed by a shot peening process or a surface corrosion process on the sliding contact surface between the steering shaft and the rack bush. The number of recesses distributed on the steering shaft can be easily and quickly formed, the sliding resistance of the steering shaft can be reduced, and the effect of smooth steering operation can be easily achieved. The invention has excellent effects.
【図１】本発明に係る舵取装置の要部の構成を示す正面
断面図である。FIG. 1 is a front sectional view showing a configuration of a main part of a steering device according to the present invention.
【図２】ラックハウジングの端部におけるラック軸の支
持部近傍の拡大断面図である。FIG. 2 is an enlarged sectional view of the vicinity of a support portion of a rack shaft at an end of a rack housing.
【図３】ラック軸とラックブッシュとの摺接状態の説明
図である。FIG. 3 is an explanatory view of a sliding contact state between a rack shaft and a rack bush.
【図４】本発明による摺動抵抗の低減効果を調べるべく
行った試験結果を示す図である。FIG. 4 is a diagram showing the results of a test performed to examine the effect of reducing sliding resistance according to the present invention.
１ ラック軸 1a 凹所 ２ ピニオン軸 10 ラック歯 20 ピニオン 22 ラックブッシュ Ｈ1 ラックハウジング1 rack shaft 1a recess second pinion shaft 10 the rack teeth 20 a pinion 22 rack bushing H 1 rack housing
───────────────────────────────────────────────────── フロントページの続き (72)発明者 濱田 卓範 大阪府大阪市中央区南船場三丁目５番８号 光洋精工株式会社内 (72)発明者 長井 建治 大阪府大阪市中央区南船場三丁目５番８号 光洋精工株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takanori Hamada 3-8-8 Minamisenba, Chuo-ku, Osaka-shi, Osaka Inside Koyo Seiko Co., Ltd. (72) Inventor Kenji Nagai 3-chome, Minamisenba, Chuo-ku, Osaka-shi, Osaka No. 8 Koyo Seiko Co., Ltd.
Claims (4)
作に応じて支持部に摺接しつつ軸長方向に移動する舵取
り軸を備える舵取装置において、 前記舵取り軸及び／又は支持部の他方との摺接面に、潤
滑材を保持すべく分布形成された複数の凹所を備えるこ
とを特徴とする舵取装置。1. A steering device having a steering shaft supported in a housing and moved in an axial direction while slidingly contacting a support portion in response to a steering operation, wherein the steering device includes a steering shaft and / or the other of the support portion. A steering device comprising a plurality of recesses formed on a sliding contact surface so as to hold a lubricant.
ニオンに噛合するラック歯をその一部に備えるラック軸
である請求項１記載の舵取装置。2. The steering device according to claim 1, wherein the steering shaft is a rack shaft partially including rack teeth meshing with a pinion that rotates in conjunction with a steering wheel.
ニング加工により形成してある請求項１又は請求項２記
載の舵取装置。3. The steering device according to claim 1, wherein the recess is formed by shot peening the sliding surface.
により形成してある請求項１又は請求項２記載の舵取装
置。4. The steering device according to claim 1, wherein the recess is formed by surface corrosion processing of the sliding contact surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000095967A JP2001278074A (en) | 2000-03-30 | 2000-03-30 | Steering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000095967A JP2001278074A (en) | 2000-03-30 | 2000-03-30 | Steering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001278074A true JP2001278074A (en) | 2001-10-10 |
Family
ID=18610794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000095967A Pending JP2001278074A (en) | 2000-03-30 | 2000-03-30 | Steering device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001278074A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101476303B1 (en) * | 2011-03-14 | 2014-12-24 | 한국델파이주식회사 | Rack guide for steering gear |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5735519U (en) * | 1980-08-08 | 1982-02-24 | ||
| JPS5871374A (en) * | 1981-10-23 | 1983-04-28 | Eagle Ind Co Ltd | Formation of bearing surface or rotating shaft surface in sliding bearing |
| JPH0261773U (en) * | 1988-10-31 | 1990-05-08 | ||
| JPH02294423A (en) * | 1989-05-02 | 1990-12-05 | Hitachi Ltd | Sliding material and method for treating surface thereof |
| JPH07188738A (en) * | 1993-12-28 | 1995-07-25 | Fuji Kihan:Kk | Method for preventing wear on sliding part of metallic formed article |
| JPH10278811A (en) * | 1997-04-03 | 1998-10-20 | Kayaba Ind Co Ltd | Steering device |
-
2000
- 2000-03-30 JP JP2000095967A patent/JP2001278074A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5735519U (en) * | 1980-08-08 | 1982-02-24 | ||
| JPS5871374A (en) * | 1981-10-23 | 1983-04-28 | Eagle Ind Co Ltd | Formation of bearing surface or rotating shaft surface in sliding bearing |
| JPH0261773U (en) * | 1988-10-31 | 1990-05-08 | ||
| JPH02294423A (en) * | 1989-05-02 | 1990-12-05 | Hitachi Ltd | Sliding material and method for treating surface thereof |
| JPH07188738A (en) * | 1993-12-28 | 1995-07-25 | Fuji Kihan:Kk | Method for preventing wear on sliding part of metallic formed article |
| JPH10278811A (en) * | 1997-04-03 | 1998-10-20 | Kayaba Ind Co Ltd | Steering device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101476303B1 (en) * | 2011-03-14 | 2014-12-24 | 한국델파이주식회사 | Rack guide for steering gear |
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