JPH10315990A - Bearing - Google Patents

Bearing

Info

Publication number
JPH10315990A
JPH10315990A JP14574497A JP14574497A JPH10315990A JP H10315990 A JPH10315990 A JP H10315990A JP 14574497 A JP14574497 A JP 14574497A JP 14574497 A JP14574497 A JP 14574497A JP H10315990 A JPH10315990 A JP H10315990A
Authority
JP
Japan
Prior art keywords
peripheral surface
bush
inner peripheral
region
bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP14574497A
Other languages
Japanese (ja)
Other versions
JP3807025B2 (en
Inventor
Takashi Yoshikawa
隆 吉川
Hiroshi Suda
博 須田
Kazuharu Tanabe
和治 田辺
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.)
Oiles Industry Co Ltd
Original Assignee
Oiles Industry Co 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 Oiles Industry Co Ltd filed Critical Oiles Industry Co Ltd
Priority to JP14574497A priority Critical patent/JP3807025B2/en
Publication of JPH10315990A publication Critical patent/JPH10315990A/en
Application granted granted Critical
Publication of JP3807025B2 publication Critical patent/JP3807025B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To hardly cause deflection in a rack shaft even if radial force is applied and enable support in such a manner freely slide by providing a projection part extended in the axial direction in a region of an outer bush outer peripheral surface that is not in contact with the inner peripheral surface of a gear case, and providing an inner bush in an enlarged-diameter cylindrical part of the inner peripheral surface. SOLUTION: A bearing 31 comprises an outer bush 32 made of a synthetic resin which has elasticity, and an inner bush 33. A flat surface 40 in the region 39 that is not in contact with the gear case inner peripheral surface is provided with an axially extended projection part 57 having a triangular section corresponding to a region 52 of a bearing surface 46. An inner bush 33 is fixed to an enlarged-diameter cylindrical surface 48 of an outer bush 32, and the diameter of the inner peripheral surface is made larger than the imaginary inner diameter by about 0.32 mm. By this arrangement, the rack shaft can be supported from the outside at a reinforced flat surface 54 by the projection part 57, so that even if radial force is applied to the rack shaft, deflection is hardly caused in the rack shaft, and slidable support can be achieved without producing hammering sound between the shaft and the bearing 31.

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、自動車等の車輌に
おけるラック・ピニオン式ステアリング装置において、
ラック軸をギアケース内に摺動自在に支承する軸受に関
する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rack and pinion type steering device for a vehicle such as an automobile.
The present invention relates to a bearing for slidably supporting a rack shaft in a gear case.

【0002】[0002]

【発明が解決しようとする課題】自動車等の車輌におけ
るラック・ピニオン式ステアリング装置は、操舵輪(ハ
ンドル)の回転によってこれに連なるピニオン軸を回転
させ、該ピニオン軸と噛合するラック軸をギアケース内
で左右方向に摺動させ、これに連繋する操向輪の操向を
行うようになっている。
In a rack and pinion type steering device for a vehicle such as an automobile, a pinion shaft connected to the steering wheel (handle) is rotated by rotation of a steering wheel (steering wheel), and a rack shaft meshing with the pinion shaft is rotated by a gear case. Inside, the steering wheel connected thereto is steered.

【0003】このようなラック・ピニオン式ステアリン
グ装置におけるラック軸をギアケース内に摺動自在に支
承する手段としては、例えば、図7に示すように、内側
リング1と外側リング2との間にゴム3を介在させ、ゴ
ム3においてラック軸4のラジアル(径)方向変位を吸
収しつつラック軸4を摺動自在に支承するように構成さ
れた軸受5、又は図8に示すように、外周面10に、ギ
アケース11の内周面12と接触する円弧状をなす接触
領域13とギアケース11の内周面12と接触しない平
坦状の非接触領域14とを周方向に交互に備えると共に
接触領域13の略中央部に係止突起15を備え、内周面
16に、ギアケース11の内周面12と接触しない非接
触領域14に対応して配されており、内周面16内に配
されるラック軸(図示せず)の周面と所定の締め代をも
って摺接する領域19と、ギアケース11の内周面12
と接触する領域13に対応して配されており、ラック軸
の周面と締め代をもたずに摺接する領域20とを周方向
に交互に備えた弾性を有する合成樹脂からなる軸受21
等がある。
As means for slidably supporting a rack shaft in a gear case in such a rack and pinion type steering apparatus, for example, as shown in FIG. A bearing 5 configured to slidably support the rack shaft 4 while interposing the rubber 3 and absorbing the radial (radial) displacement of the rack shaft 4 in the rubber 3 or, as shown in FIG. The surface 10 is provided with a circular arc-shaped contact region 13 that contacts the inner peripheral surface 12 of the gear case 11 and a flat non-contact region 14 that does not contact the inner peripheral surface 12 of the gear case 11 alternately in the circumferential direction. A locking projection 15 is provided at a substantially central portion of the contact area 13, and is disposed on the inner peripheral surface 16 so as to correspond to the non-contact area 14 not in contact with the inner peripheral surface 12 of the gear case 11. Rack shaft ( A sliding contact area 19 with the circumferential surface with a predetermined interference in Shimese not), the inner peripheral surface of the gear case 11 12
Bearing 21 made of elastic synthetic resin, which is provided in correspondence with the region 13 contacting with the shaft, and has the circumferential surface of the rack shaft and the region 20 which comes into sliding contact with no interference in the circumferential direction.
Etc.

【0004】軸受5においては、ラック軸4の外径公差
及び軸受5の内側リング1の内径公差を考慮し、かつ軸
受5のラック軸4に対する摺動抵抗を最小限に抑えるよ
うに、ラック軸4と内側リング1との間に摺動隙間(ク
リアランス)が設けられるが、この摺動隙間が大きいと
きにはラック軸4の内側リング1への衝突による打音の
発生が問題となる。
In the bearing 5, the outer diameter tolerance of the rack shaft 4 and the inner diameter tolerance of the inner ring 1 of the bearing 5 are taken into consideration, and the sliding resistance of the bearing 5 with respect to the rack shaft 4 is minimized. Although a sliding gap (clearance) is provided between the inner ring 1 and the inner ring 1, when the sliding gap is large, a striking sound due to the collision of the rack shaft 4 with the inner ring 1 becomes a problem.

【0005】軸受21にあっては、軸受21の非接触領
域14とギアケース11の内周面12との間に、寸法誤
差を吸収してかつ空気を流通するための隙間22が形成
されることになるが、非接触領域14では薄肉化されて
いるため、当該部位の剛性が低く、例えば操舵操作時等
において、ラック軸にラジアル方向の力が作用した場
合、隙間22と対応する部位でラック軸が撓み、ラック
軸と軸受21との間に打音が発生するという問題、ラッ
ク軸にラジアル方向の力が作用した状態での操舵操作に
おいては、ラック軸と軸受21との間の摺動抵抗が増大
し、操舵操作が重たくなるという問題、軸受21自体が
弾性を有する合成樹脂で形成されていることによるラッ
ク軸の変位量が大きいという問題がある。
In the bearing 21, a gap 22 is formed between the non-contact area 14 of the bearing 21 and the inner peripheral surface 12 of the gear case 11 for absorbing dimensional errors and flowing air. That is, since the non-contact area 14 is thinned, the rigidity of the part is low. For example, when a radial force acts on the rack shaft during a steering operation or the like, the part corresponding to the gap 22 is formed. The rack shaft is deflected, and a noise is generated between the rack shaft and the bearing 21. In a steering operation in a state where a radial force is applied to the rack shaft, the sliding motion between the rack shaft and the bearing 21 occurs. There is a problem that the dynamic resistance increases and the steering operation becomes heavy, and a problem that the displacement of the rack shaft is large due to the fact that the bearing 21 itself is formed of an elastic synthetic resin.

【0006】本発明は、前記諸点に鑑みてなされたもの
であって、その目的とするところは、ラック軸と軸受と
の間に打音が発生することなく、ラック軸にラジアル方
向の力が作用した状態での操舵操作においてもラック軸
と軸受との間の摺動抵抗が小さく円滑な操舵操作を可能
とした軸受を提供することにある。
The present invention has been made in view of the above-mentioned points, and an object of the present invention is to generate a radial force on a rack shaft without generating a tapping sound between the rack shaft and a bearing. It is an object of the present invention to provide a bearing in which a sliding resistance between a rack shaft and a bearing is small and a smooth steering operation is enabled even in a steering operation in a state where it is operated.

【0007】[0007]

【課題を解決するための手段】本発明の軸受は、ギアケ
ースとラック軸との間に介装されて、ラック軸をギアケ
ース内で摺動可能に支持するための軸受であって、弾性
を有する合成樹脂からなるアウターブッシュと、該アウ
ターブッシュ内に固定されたインナーブッシュとからな
り、アウターブッシュの外周面には、ギアケース内周面
に当接する領域と、当該領域と軸方向において隣接して
該ギアケース内周面に部分的に当接しない領域とが形成
されていると共に、その内周面には、ラック軸の周面と
所定の締め代をもって摺接する領域とラック軸の周面と
締め代をもたずに摺接する領域とをギアケース内周面に
部分的に当接しない領域に対応して周方向に備えた軸支
承面と、該軸支承面と軸方向に隣接してかつ環状肩部を
介して軸支承面に対して拡径した拡径円筒面とを備えて
おり、アウターブッシュの外周面のギアケース内周面に
部分的に当接しない領域における当該ギアケース内周面
に当接しない部位には、軸方向に伸びた突条部が前記軸
支承面の所定の締め代を有する領域に対応して設けられ
ており、アウターブッシュの外周面の前記ギアケース内
周面と部分的に当接しない領域において軸方向に伸びて
切割り溝がアウターブッシュに設けられており、アウタ
ーブッシュの内周面の拡径円筒面には、インナーブッシ
ュが固定されていることを特徴とする。
A bearing according to the present invention is provided between a gear case and a rack shaft to support the rack shaft slidably in the gear case. An outer bush made of a synthetic resin having: and an inner bush fixed in the outer bush, and an outer peripheral surface of the outer bush is axially adjacent to a region in contact with the inner peripheral surface of the gear case. A region that does not partially contact the inner peripheral surface of the gear case is formed, and the inner peripheral surface has a region that is in sliding contact with the peripheral surface of the rack shaft with a predetermined interference and the peripheral region of the rack shaft. A shaft bearing surface provided in a circumferential direction corresponding to a region that does not partially contact the inner peripheral surface of the gear case, and a region that slides in contact with the surface without interference, and is axially adjacent to the shaft supporting surface. And through the annular shoulder to the shaft bearing surface A portion of the outer peripheral surface of the outer bush that does not abut on the inner peripheral surface of the gear case in a region that does not partially contact the inner peripheral surface of the gear case. A ridge extending in the direction is provided corresponding to a region having a predetermined interference of the shaft bearing surface, and in a region of the outer peripheral surface of the outer bush that does not partially contact the inner peripheral surface of the gear case. A slit groove extending in the axial direction is provided in the outer bush, and the inner bush is fixed to the enlarged-diameter cylindrical surface of the inner peripheral surface of the outer bush.

【0008】上記構成からなる軸受において、アウター
ブッシュの外周面において、少なくともギアケース内周
面と当接する領域には、軸方向に伸びたセレーションが
形成されている。軸受をギアケース内に圧入固定する際
に、該ギアケースの内周面に軸受を密に圧接するが、こ
のセレーションにより、アウターブッシュの拡径円筒面
に圧入固定されたインナーブッシュの内径寸法精度への
影響が防止される。なお、このセレーションと同等であ
って、当該セレーションと連続するセレーションを、ラ
ック軸の周面と締め代をもたずに摺接する領域に対応す
るアウターブッシュの外周面のギアケース内周面と部分
的に当接しない領域にも設けて、上記と同等の作用が得
られるようにしてもよい。
In the bearing having the above structure, serrations extending in the axial direction are formed on at least a region of the outer peripheral surface of the outer bush that is in contact with the inner peripheral surface of the gear case. When the bearing is press-fitted and fixed in the gear case, the bearing is tightly pressed against the inner peripheral surface of the gear case. Due to this serration, the inner diameter dimensional accuracy of the inner bush press-fitted and fixed to the enlarged cylindrical surface of the outer bush is increased. Is prevented from being affected. The serrations, which are equivalent to the serrations and are continuous with the serrations, are partially formed on the outer peripheral surface of the outer bush corresponding to the area in sliding contact with the peripheral surface of the rack shaft without interference. It may be provided in a region that does not abut, so that the same operation as described above can be obtained.

【0009】また、アウターブッシュの内周面の拡径円
筒面には、環状肩部からその軸方向に所定の間隔を隔て
てリップ部が形成されている。このリップ部は、拡径円
筒面に圧入さて固定されたインナーブッシュの軸方向の
抜け止めの役割を果たす。リップは、拡径円筒面に周方
向に連続して形成されてもよいが、不連続に形成されて
いてもよい。
[0009] A lip portion is formed on the inner peripheral surface of the outer bush at a predetermined distance in the axial direction from the annular shoulder portion on the enlarged diameter cylindrical surface. The lip portion serves to prevent the inner bush, which is press-fitted and fixed to the enlarged-diameter cylindrical surface, from coming off in the axial direction. The lip may be formed continuously on the enlarged diameter cylindrical surface in the circumferential direction, or may be formed discontinuously.

【0010】アウターブッシュを形成する弾性を有する
合成樹脂としては、柔軟であってかつ強靱であり、概ね
ショア硬さ(D型)40〜60、反発弾性値(JIS−
K6301)が50〜80を有していてゴム状の弾性挙
動を残存しているもので、例えばポリエステル・エーテ
ル共重合体あるいはポリウレタン等が好適に使用され
る。
The elastic synthetic resin forming the outer bush is soft and tough, generally having a Shore hardness (D type) of 40 to 60, and a rebound resilience value (JIS-JIS).
K6301) having a rubbery elastic behavior of 50 to 80, for example, polyester / ether copolymer or polyurethane is preferably used.

【0011】インナーブッシュとしては、鋼薄板と、該
鋼薄板の表面に一体に接合された焼結金属層と、該焼結
金属層に含浸被覆された合成樹脂層との三層構造からな
り、該合成樹脂層を内側にして円筒状に捲回した所謂巻
きブッシュ又は同様に三層構造からなり、合成樹脂層を
内側にして絞り加工により形成した継ぎ目無しの円筒状
ブッシュが使用される。
The inner bush has a three-layer structure of a steel sheet, a sintered metal layer integrally joined to the surface of the steel sheet, and a synthetic resin layer impregnated and coated on the sintered metal layer. A so-called wound bush, which is wound in a cylindrical shape with the synthetic resin layer inside, or a seamless cylindrical bush, which has a three-layer structure and is formed by drawing with the synthetic resin layer inside, is used.

【0012】本発明の軸受はギアケースとラック軸との
間に介装されるが、抜け止め防止として、アウターブッ
シュの外周面には、ギアケース内周面に嵌合する係止用
の突起が設けられる。この突起は、切割り溝を挟んで相
対向するように、アウターブッシュの一端面側に一対設
けてもよいが、これに代えて又はこれと共に、アウター
ブッシュの一端面側に切割り溝を挟むことなしに一個又
は3個以上設けても、更には、アウターブッシュの他端
面側に一個以上設けてもよい。
The bearing of the present invention is interposed between the gear case and the rack shaft. To prevent the bearing from coming off, the outer peripheral surface of the outer bush is provided with a locking projection fitted to the inner peripheral surface of the gear case. Is provided. A pair of the protrusions may be provided on one end surface side of the outer bush so as to face each other with the slit groove interposed therebetween, but instead of or together with this, the cut groove is interposed on the one end surface side of the outer bush. One or three or more may be provided without any problem, or one or more may be provided on the other end surface side of the outer bush.

【0013】[0013]

【発明の実施の形態】次に本発明及び本発明の実施の形
態を、図に示す好ましい実施例に基づいて更に詳細に説
明する。なお、本発明は、これら実施例に何ら限定され
ないのである。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention and embodiments of the present invention will be described in more detail with reference to the preferred embodiments shown in the drawings. The present invention is not limited to these examples.

【0014】[0014]

【実施例】図1乃至図4において、本例の軸受31は、
弾性を有する合成樹脂からなるアウターブッシュ32
と、アウターブッシュ32内に固定されたインナーブッ
シュ33とから構成されている。
1 to 4, a bearing 31 of the present embodiment has
Outer bush 32 made of elastic synthetic resin
And an inner bush 33 fixed in the outer bush 32.

【0015】アウターブッシュ32の外周面35には、
ギアケース36の内周面37に当接する領域38と、領
域38の軸方向の一方の端部に隣接してギアケース36
の内周面37に部分的に当接しない領域39とが形成さ
れている。領域39には、軸方向に伸びたセレーション
41と、当該領域39におけるギアケース36の内周面
37に当接しない部位としての、円筒を軸方向に切除し
てなる複数個、本例では3個の平坦面40とが周方向に
関して交代的に形成されている。
On the outer peripheral surface 35 of the outer bush 32,
A region 38 in contact with the inner peripheral surface 37 of the gear case 36 and a gear case 36 adjacent to one axial end of the region 38.
And a region 39 not partially in contact with the inner peripheral surface 37 of the inner peripheral surface is formed. The area 39 includes serrations 41 extending in the axial direction, and a plurality of axially cut cylinders, 3 in this example, serving as parts that do not come into contact with the inner peripheral surface 37 of the gear case 36 in the area 39. The flat surfaces 40 are alternately formed in the circumferential direction.

【0016】アウターブッシュ32の内周面45には、
軸支承面46と、軸支承面46と軸方向において隣接し
てかつ環状肩部47を介して軸支承面46に対して拡径
した拡径円筒面48とが形成されている。拡径円筒面4
8は、ギアケース36の内周面37に当接する領域38
にほぼ対応して設けられている。
On the inner peripheral surface 45 of the outer bush 32,
A shaft bearing surface 46 and an enlarged cylindrical surface 48 that is adjacent to the shaft bearing surface 46 in the axial direction and that has an enlarged diameter with respect to the shaft bearing surface 46 via an annular shoulder 47 are formed. Expanded cylindrical surface 4
8 is a region 38 in contact with the inner peripheral surface 37 of the gear case 36.
Is provided substantially corresponding to.

【0017】軸支承面46は、ラック軸50の周面51
と所定の締め代をもって摺接する複数個、本例例では3
個の領域52と、ラック軸50の周面51と締め代をも
たずに摺接する複数個、本例例では3個の領域53とを
領域39に対応してかつ周方向において交代的に等間隔
をもって備えている。各領域52は、領域39の平坦面
40に平行な平坦面54として形成されており、各平坦
面54がラック軸50の周面51に締め代をもって摺接
するようになっている。
The shaft bearing surface 46 is formed on the peripheral surface 51 of the rack shaft 50.
And a plurality of pieces that slide in contact with a predetermined interference, in this example 3
Regions 52 and a plurality of, in this example, three regions 53 slidingly contacting the peripheral surface 51 of the rack shaft 50 without interference, corresponding to the regions 39 and alternately in the circumferential direction. Provided at equal intervals. Each region 52 is formed as a flat surface 54 parallel to the flat surface 40 of the region 39, and each flat surface 54 comes into sliding contact with the peripheral surface 51 of the rack shaft 50 with an interference.

【0018】ギアケース36の内周面37に当接しない
部位としての領域39の平坦面40には、軸方向に伸び
た断面三角形状の突条部57が軸支承面46の領域52
に対応して設けられている。なお、突条部57の断面形
状については三角形に限らず、その他四角形、半円形又
は半楕円形等であってもよい。各突条部57は、各平坦
面40におけるアウターブッシュ32の補強リブとして
機能する。
On the flat surface 40 of the region 39, which does not come into contact with the inner peripheral surface 37 of the gear case 36, a ridge 57 having a triangular cross section extending in the axial direction is formed in a region 52 of the shaft bearing surface 46.
Is provided in correspondence with. The cross-sectional shape of the ridge 57 is not limited to a triangle, but may be a quadrangle, a semicircle, a semi-ellipse, or the like. Each ridge portion 57 functions as a reinforcing rib of the outer bush 32 on each flat surface 40.

【0019】アウターブッシュ32の外周面35の領域
39において、アウターブッシュ32の端面59から軸
方向伸びて複数個、本例では3個の切割り溝60がアウ
ターブッシュ32に設けられており、各切割り溝60の
開口部61側の端部において、アウターブッシュ32の
外周面35には、切割り溝60を挟んで相対向する抜け
止め用である係止用の突起62が一対設けられている。
In a region 39 of the outer peripheral surface 35 of the outer bush 32, a plurality of, in this example, three, notch grooves 60 are provided in the outer bush 32 so as to extend in the axial direction from the end face 59 of the outer bush 32. At the end of the slit 61 on the opening 61 side, a pair of locking projections 62 are provided on the outer peripheral surface 35 of the outer bush 32 so as to face each other with the slit 60 interposed therebetween. I have.

【0020】アウターブッシュ32の外周面35におい
て、領域38には、軸方向に伸びたセレーション65が
形成されている。セレーション65は、セレーション4
1と軸方向において連続して形成されている。領域38
及び39において、セレーション65及び41の各頂部
がギアケース36の内周面37に実質的に当接するよう
になっている。
On the outer peripheral surface 35 of the outer bush 32, a serration 65 extending in the axial direction is formed in a region 38. Serration 65 is Serration 4
1 and are formed continuously in the axial direction. Region 38
At 39 and 39, the tops of the serrations 65 and 41 substantially abut against the inner peripheral surface 37 of the gear case 36.

【0021】アウターブッシュ32の内周面45の拡径
円筒面48には、環状肩部47から軸方向に所定の間隔
を隔てて環状のリップ部70が形成されており、環状肩
部47とリップ部70との間にインナーブッシュ33が
圧入、固定されている。リップ部70は、インナーブッ
シュ33の軸方向への抜け止めの役割を果たす。
An annular lip 70 is formed on the enlarged diameter cylindrical surface 48 of the inner peripheral surface 45 of the outer bush 32 at a predetermined interval in the axial direction from the annular shoulder 47. The inner bush 33 is press-fitted between the lip 70 and the lip 70. The lip portion 70 functions to prevent the inner bush 33 from coming off in the axial direction.

【0022】インナーブッシュ33には、薄鋼板と、こ
の薄鋼板の表面に一体に接合された焼結金属層と、この
焼結金属層に含浸被覆された合成樹脂層の三層構造から
なり、合成樹脂層を内側にして円筒状に捲回した所謂巻
きブッシュが使用される。また、この巻きブッシュに代
えて、同様に三層構造からなり、合成樹脂層を内側にし
て絞り加工により形成される継ぎ目無しの円筒状ブッシ
ュを使用してもよい。
The inner bush 33 has a three-layer structure of a thin steel sheet, a sintered metal layer integrally joined to the surface of the thin steel sheet, and a synthetic resin layer impregnated and coated on the sintered metal layer. A so-called wound bush wound in a cylindrical shape with the synthetic resin layer inside is used. Instead of the wound bush, a seamless cylindrical bush having a three-layer structure and formed by drawing with the synthetic resin layer inside may also be used.

【0023】インナーブッシュ33は、その内周面80
の直径が、平坦面54で規定される領域39でのアウタ
ーブッシュ32の仮想内面81の内径よりも、0.02
mm乃至0.50程度、好ましくは0.25乃至0.3
5mm程度、好適設計では0.32mm程度大きくなる
ように、形成される。
The inner bush 33 has an inner peripheral surface 80.
Is smaller than the inner diameter of the virtual inner surface 81 of the outer bush 32 in the area 39 defined by the flat surface 54 by 0.02 or more.
mm to about 0.50, preferably 0.25 to 0.3
It is formed to be about 5 mm larger, and about 0.32 mm larger in a preferred design.

【0024】以上の軸受31は、図4に示すように、ギ
アケース36の内周面37に、突起62をギアケース3
6の内周面37に形成された環状凹所75に嵌合して、
固定される。環状凹所75に嵌合の際に、軸受31は、
領域39において切割り溝60を介し若干縮径されて、
ギアケース36の内周面37に配される。
As shown in FIG. 4, the bearing 31 is provided with a projection 62 on the inner peripheral surface 37 of the gear case 36.
6 is fitted into an annular recess 75 formed on the inner peripheral surface 37,
Fixed. When fitting into the annular recess 75, the bearing 31
In the region 39, the diameter is slightly reduced through the slit 60,
It is arranged on the inner peripheral surface 37 of the gear case 36.

【0025】軸受31によれば、操舵輪(ハンドル)が
操作(回転)されない際には、ラック軸50は、アウタ
ーブッシュ32において、突条部57により外側から補
強された領域52の平坦面54で実質的に軸方向に摺動
自在に支持されており、したがって、操舵操作時等にお
いて、ラック軸50にラジアル方向の力が作用した場合
でも、ラック軸50に撓みが生じ難く、ラック軸50と
軸受31との間に打音が生じなく、そして、ラック軸5
0にラジアル方向の力が作用した状態での操舵操作にお
いては、ラック軸50がインナーブッシュ33の内周面
80により実質的に摺動自在に支持されるため、ラック
軸50と軸受31との間の摺動抵抗の増大はそれ程な
く、操舵操作が重たくなるということがない。
According to the bearing 31, when the steering wheel (handle) is not operated (rotated), the rack shaft 50 is formed on the outer bush 32 by the flat surface 54 of the region 52 reinforced from the outside by the ridge 57. Therefore, even when a radial force is applied to the rack shaft 50 during a steering operation or the like, the rack shaft 50 is unlikely to be bent, and the rack shaft 50 is not slidably supported. No noise is produced between the bearing and the bearing 31, and the rack shaft 5
In a steering operation in a state where a radial force acts on the inner shaft 0, the rack shaft 50 is substantially slidably supported by the inner peripheral surface 80 of the inner bush 33. The sliding resistance during the increase is not so large, and the steering operation does not become heavy.

【0026】また、インナーブッシュ33が鋼薄板を具
備した巻きブッシュ又は円筒状ブッシュからなると、イ
ンナーブッシュ33自体に加えて軸受31全体のラジア
ル方向の変形が少なく、ラック軸50にラジアル方向の
力が作用してもラック軸50がそれ程変形しなく、ラッ
ク軸50の円滑な摺動を確保することができる。
When the inner bush 33 is formed of a wound bush or a cylindrical bush provided with a thin steel plate, in addition to the inner bush 33 itself, the radial deformation of the entire bearing 31 is small, and a radial force is applied to the rack shaft 50. Even if it acts, the rack shaft 50 is not so deformed, and the smooth sliding of the rack shaft 50 can be ensured.

【0027】更に、切割り溝60がアウターブッシュ3
2に設けられているため、ギアケース36と軸受31と
の熱膨張差による締め代の消失を回避し得、高温時にお
いてもラック軸50をがたなしに支持し得る。
Further, the split groove 60 is formed in the outer bush 3.
2, the interference can be prevented from disappearing due to the difference in thermal expansion between the gear case 36 and the bearing 31, and the rack shaft 50 can be supported without play even at a high temperature.

【0028】前記例では、各切割り溝60の開口部61
側の端部において、すなわち、アウターブッシュ32の
一端面80側において、アウターブッシュ32の外周面
35に突起62を設けたが、これに代えて、図5及び図
6に示すように、アウターブッシュ32の他端面81側
の外周面35に、軸方向において各切割り溝60に対応
してそれぞれ一個の係止用の突起82を設けてもよい。
なお、図5及び図6に示す軸受90では、アウターブッ
シュ32の外周面35におけるギアケース36の内周面
37に当接する領域38が他端面81まで伸びている。
このようにアウターブッシュ32を図5及び図6に示す
ように構成すると、切割り溝60及び突起82を含めた
アウターブッシュ32の型成形による製造が極めて容易
になり、製造性の観点から極めて好ましい。
In the above example, the opening 61 of each split groove 60 is used.
At the end on the side, that is, on the one end face 80 side of the outer bush 32, the projection 62 is provided on the outer peripheral surface 35 of the outer bush 32. Alternatively, as shown in FIGS. One locking projection 82 may be provided on the outer peripheral surface 35 on the other end surface 81 side of the 32 in correspondence with each of the split grooves 60 in the axial direction.
In the bearing 90 shown in FIGS. 5 and 6, a region 38 of the outer peripheral surface 35 of the outer bush 32 that contacts the inner peripheral surface 37 of the gear case 36 extends to the other end surface 81.
When the outer bush 32 is configured as shown in FIGS. 5 and 6 in this manner, the outer bush 32 including the slit 60 and the projection 82 can be easily manufactured by molding, which is extremely preferable from the viewpoint of manufacturability. .

【0029】[0029]

【発明の効果】以上のように本発明によれば、ラック軸
と軸受との間に打音が発生することなく、ラック軸にラ
ジアル方向の力が作用した状態での操舵操作においても
ラック軸と軸受との間の摺動抵抗が小さく円滑な操舵操
作を可能とすることができる。
As described above, according to the present invention, the rack shaft can be operated even when a radial force is applied to the rack shaft without hitting between the rack shaft and the bearing. The sliding resistance between the bearing and the bearing is small, and a smooth steering operation can be performed.

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

【図1】本発明の好ましい一実施例の側面図である。FIG. 1 is a side view of a preferred embodiment of the present invention.

【図2】図1に示す実施例のII−II線断面図であ
る。
FIG. 2 is a sectional view taken along line II-II of the embodiment shown in FIG.

【図3】図1に示す実施例の平面図である。FIG. 3 is a plan view of the embodiment shown in FIG. 1;

【図4】図1に示す実施例をラック・ピニオン式ステア
リング装置におけるラック軸及びギアケース間に配した
断面図である。
FIG. 4 is a sectional view showing the embodiment shown in FIG. 1 arranged between a rack shaft and a gear case in the rack and pinion type steering device.

【図5】本発明の好ましい他の実施例の断面図である。FIG. 5 is a cross-sectional view of another preferred embodiment of the present invention.

【図6】図5に示す実施例の平面図である。FIG. 6 is a plan view of the embodiment shown in FIG. 5;

【図7】従来例の説明図である。FIG. 7 is an explanatory diagram of a conventional example.

【図8】他の従来例の説明図である。FIG. 8 is an explanatory diagram of another conventional example.

【符号の説明】[Explanation of symbols]

31 軸受 32 アウターブッシュ 33 インナーブッシュ 35 外面 38、39 領域 46 軸支承面 48 拡径円筒面 52、53 領域 57 突状部 60 切割り溝 DESCRIPTION OF SYMBOLS 31 Bearing 32 Outer bush 33 Inner bush 35 Outer surface 38, 39 area 46 Shaft bearing surface 48 Large diameter cylindrical surface 52, 53 area 57 Projecting part 60 Groove

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】 ギアケースとラック軸との間に介装され
て、ラック軸をギアケース内で摺動可能に支持するため
の軸受であって、弾性を有する合成樹脂からなるアウタ
ーブッシュと、該アウターブッシュ内に固定されたイン
ナーブッシュとからなり、アウターブッシュの外周面に
は、ギアケース内周面に当接する領域と、当該領域と軸
方向において隣接して該ギアケース内周面に部分的に当
接しない領域とが形成されていると共に、その内周面に
は、ラック軸の周面と所定の締め代をもって摺接する領
域とラック軸の周面と締め代をもたずに摺接する領域と
をギアケース内周面に部分的に当接しない領域に対応し
て周方向に備えた軸支承面と、該軸支承面と軸方向に隣
接してかつ環状肩部を介して軸支承面に対して拡径した
拡径円筒面とを備えており、アウターブッシュの外周面
のギアケース内周面に部分的に当接しない領域における
当該ギアケース内周面に当接しない部位には、軸方向に
伸びた突条部が前記軸支承面の所定の締め代を有する領
域に対応して設けられており、アウターブッシュの外周
面の前記ギアケース内周面と部分的に当接しない領域に
おいて軸方向に伸びて切割り溝がアウターブッシュに設
けられており、アウターブッシュの内周面の拡径円筒面
には、インナーブッシュが固定されていることを特徴と
する軸受。
An outer bush made of an elastic synthetic resin, the bearing being interposed between a gear case and a rack shaft to support the rack shaft slidably in the gear case; An inner bush fixed in the outer bush; an outer peripheral surface of the outer bush; a region in contact with the inner peripheral surface of the gear case; The inner peripheral surface is formed with a region that is in sliding contact with the peripheral surface of the rack shaft with a predetermined interference and the peripheral surface of the rack shaft is free from interference with the peripheral surface of the rack shaft. A shaft bearing surface provided in the circumferential direction with a contacting region corresponding to a region not partially abutting on the inner peripheral surface of the gear case; and a shaft which is axially adjacent to the shaft supporting surface and via an annular shoulder. With an enlarged cylindrical surface that is enlarged with respect to the bearing surface In the region of the outer peripheral surface of the outer bush that does not abut on the inner peripheral surface of the gear case in a region that does not abut on the inner peripheral surface of the gear case, a protruding ridge extending in the axial direction is provided on the shaft bearing surface. Is provided corresponding to a region having a predetermined interference, and a notch groove extends in the axial direction in a region of the outer peripheral surface of the outer bush that does not partially contact the inner peripheral surface of the gear case. A bearing, wherein an inner bush is fixed to an enlarged cylindrical surface of an inner peripheral surface of the outer bush.
【請求項2】 アウターブッシュの外周面において、少
なくともギアケース内周面に当接する領域には、軸方向
に伸びたセレーションが形成されている請求項1に記載
の軸受。
2. The bearing according to claim 1, wherein a serration extending in the axial direction is formed on at least a region of the outer peripheral surface of the outer bush that contacts the inner peripheral surface of the gear case.
【請求項3】 アウターブッシュの内周面の拡径円筒面
には、環状肩部からその軸方向に所定の間隔を隔ててリ
ップ部が形成されている請求項1又は2に記載の軸受。
3. The bearing according to claim 1, wherein a lip portion is formed on the enlarged diameter cylindrical surface of the inner peripheral surface of the outer bush at a predetermined interval in an axial direction from the annular shoulder portion.
【請求項4】 インナーブッシュは、鋼薄板と、該鋼薄
板の表面に一体に接合された焼結金属層と、該焼結金属
層に含浸被覆された合成樹脂層との三層構造からなり、
該合成樹脂層を内側にして円筒状に捲回した巻きブッシ
ュからなる請求項1から3のいずれか一項に記載の軸
受。
4. The inner bush has a three-layer structure of a steel sheet, a sintered metal layer integrally joined to the surface of the steel sheet, and a synthetic resin layer impregnated and coated on the sintered metal layer. ,
The bearing according to any one of claims 1 to 3, comprising a winding bush wound in a cylindrical shape with the synthetic resin layer inside.
【請求項5】 インナーブッシュは、鋼薄板と、該鋼薄
板の表面に一体に接合された焼結金属層と、該焼結金属
層に含浸被覆された合成樹脂層との三層構造からなり、
該合成樹脂層を内側にして絞り加工により形成された継
ぎ目無しの円筒状ブッシュからなる請求項1から3のい
ずれか一項に記載の軸受。
5. The inner bush has a three-layer structure of a steel sheet, a sintered metal layer integrally joined to the surface of the steel sheet, and a synthetic resin layer impregnated and coated on the sintered metal layer. ,
The bearing according to any one of claims 1 to 3, comprising a seamless cylindrical bush formed by drawing with the synthetic resin layer inside.
【請求項6】 アウターブッシュの外周面には、ギアケ
ース内周面に嵌合する係止用の突起が設けられている請
求項1から5のいずれか一項に記載の軸受。
6. The bearing according to claim 1, wherein an outer peripheral surface of the outer bush is provided with a locking projection fitted to an inner peripheral surface of the gear case.
JP14574497A 1997-05-19 1997-05-19 bearing Expired - Lifetime JP3807025B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14574497A JP3807025B2 (en) 1997-05-19 1997-05-19 bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14574497A JP3807025B2 (en) 1997-05-19 1997-05-19 bearing

Publications (2)

Publication Number Publication Date
JPH10315990A true JPH10315990A (en) 1998-12-02
JP3807025B2 JP3807025B2 (en) 2006-08-09

Family

ID=15392154

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14574497A Expired - Lifetime JP3807025B2 (en) 1997-05-19 1997-05-19 bearing

Country Status (1)

Country Link
JP (1) JP3807025B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009120027A (en) * 2007-11-14 2009-06-04 Showa Corp Hydraulic power steering system
JP2020117174A (en) * 2019-01-28 2020-08-06 日立オートモティブシステムズ株式会社 Steering device, and steering device manufacturing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009120027A (en) * 2007-11-14 2009-06-04 Showa Corp Hydraulic power steering system
JP2020117174A (en) * 2019-01-28 2020-08-06 日立オートモティブシステムズ株式会社 Steering device, and steering device manufacturing method

Also Published As

Publication number Publication date
JP3807025B2 (en) 2006-08-09

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